From 660f90f6879c4bf3cb16ec405c64070d5fdefa68 Mon Sep 17 00:00:00 2001
From: Servo WPT Sync <32481905+servo-wpt-sync@users.noreply.github.com>
Date: Sun, 28 Sep 2025 03:59:05 +0200
Subject: [PATCH] Sync WPT with upstream (28-09-2025) (#39541)

Automated downstream sync of changes from upstream as of 28-09-2025
[no-wpt-sync]

Signed-off-by: WPT Sync Bot <ghbot+wpt-sync@servo.org>
---
 .../FileAPI/url/url-with-fetch.any.js.ini     |    3 -
 ...ini => idbindex_getAll-options.any.js.ini} |   12 +-
 ...=> idbindex_getAllKeys-options.any.js.ini} |   17 +-
 ....ini => idbindex_getAllRecords.any.js.ini} |   12 +-
 .../IndexedDB/idbobjectstore_get.any.js.ini   |    3 +
 ... idbobjectstore_getAll-options.any.js.ini} |    8 +-
 ...objectstore_getAllKeys-options.any.js.ini} |   13 +-
 ...> idbobjectstore_getAllRecords.any.js.ini} |   17 +-
 tests/wpt/meta/MANIFEST.json                  | 5415 +++++++++++++++--
 .../layer-font-face-override.html.ini         |    6 -
 ...ontainer-scroll-direction-parsing.html.ini |    2 +
 ...er-scroll-direction-serialization.html.ini |    2 +
 .../scroll-state/scroll-direction-hv.html.ini |    2 +
 ...ion-programmatic-absolute-scrolls.html.ini |    2 +
 ...ion-programmatic-relative-scrolls.html.ini |    2 +
 .../scroll-state/scroll-direction-wm.html.ini |    2 +
 ...-content-is-min-width-max-content.html.ini |    2 -
 .../generic-family-keywords-003.html.ini      |    3 +
 ...ule-width-interpolation-repeaters.html.ini |  684 +++
 ...gap-decorations-fragmentation-001.html.ini |    2 +
 ...gap-decorations-fragmentation-002.html.ini |    2 +
 ...gap-decorations-fragmentation-003.html.ini |    2 +
 ...gap-decorations-fragmentation-004.html.ini |    2 +
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 ...gap-decorations-fragmentation-006.html.ini |    2 +
 ...gap-decorations-fragmentation-007.html.ini |    2 +
 ...gap-decorations-fragmentation-008.html.ini |    2 +
 ...gap-decorations-fragmentation-009.html.ini |    2 +
 ...gap-decorations-fragmentation-010.html.ini |    2 +
 ...gap-decorations-fragmentation-011.html.ini |    2 +
 ...gap-decorations-fragmentation-012.html.ini |    2 +
 ...gap-decorations-fragmentation-013.html.ini |    2 +
 ...gap-decorations-fragmentation-014.html.ini |    2 +
 ...gap-decorations-fragmentation-015.html.ini |    2 +
 ...gap-decorations-fragmentation-016.html.ini |    2 +
 ...gap-decorations-fragmentation-017.html.ini |    2 +
 .../multicol-gap-decorations-020.html.ini     |    2 +
 .../column-justify-items-center-001.html.ini  |    2 +
 ...-items-end-justify-self-start-001.html.ini |    2 +
 .../column-overflow-alignment-001.html.ini    |    2 +
 .../row-align-items-center-001.html.ini       |    2 +
 ...gn-items-end-align-self-start-001.html.ini |    2 +
 .../row-overflow-alignment-001.html.ini       |    2 +
 .../tentative/gap/column-gaps-001.html.ini    |    2 +
 .../tentative/gap/row-gaps-001.html.ini       |    2 +
 .../column-explicit-placement-001.html.ini    |    2 +
 .../column-explicit-placement-002.html.ini    |    2 +
 .../column-explicit-placement-003.html.ini    |    2 +
 .../row-explicit-placement-001.html.ini       |    2 +
 .../row-explicit-placement-002.html.ini       |    2 +
 .../row-explicit-placement-003.html.ini       |    2 +
 .../row-explicit-placement-004.html.ini       |    2 +
 .../row-explicit-placement-005.html.ini       |    2 +
 .../row-explicit-placement-006.html.ini       |    2 +
 .../row-explicit-placement-007.html.ini       |    2 +
 .../row-explicit-placement-008.html.ini       |    2 +
 ...n-intrinsic-inline-container-size.html.ini |    2 +
 ...onry-intrinsic-sizing-cols-001-fr.html.ini |    2 +
 ...onry-intrinsic-sizing-cols-004-fr.html.ini |    2 +
 ...masonry-intrinsic-sizing-cols-007.html.ini |    2 +
 .../row-defined-height.html.ini               |    2 +
 .../column-auto-placement-001.html.ini        |    2 +
 .../column-dense-packing-001.html.ini         |    2 +
 .../column-dense-packing-002.html.ini         |    2 +
 .../column-dense-packing-004.html.ini         |    2 +
 .../column-dense-packing-005.html.ini         |    2 +
 .../column-dense-packing-006.html.ini         |    2 +
 ...lumn-dense-packing-multi-span-001.html.ini |    2 +
 ...lumn-dense-packing-multi-span-002.html.ini |    2 +
 ...lumn-dense-packing-multi-span-003.html.ini |    2 +
 ...lumn-dense-packing-multi-span-004.html.ini |    2 +
 ...lumn-dense-packing-multi-span-005.html.ini |    2 +
 ...lumn-dense-packing-multi-span-006.html.ini |    2 +
 ...lumn-dense-packing-multi-span-007.html.ini |    2 +
 ...lumn-dense-packing-multi-span-008.html.ini |    2 +
 .../row-dense-packing-001.html.ini            |    2 +
 .../row-dense-packing-002.html.ini            |    2 +
 .../row-dense-packing-003.html.ini            |    2 +
 .../row-dense-packing-004.html.ini            |    2 +
 .../row-dense-packing-multi-span-001.html.ini |    2 +
 .../row-dense-packing-multi-span-002.html.ini |    2 +
 .../row-dense-packing-multi-span-003.html.ini |    2 +
 .../row-dense-packing-multi-span-004.html.ini |    2 +
 .../column-initial-item-tolerance.html.ini    |    2 +
 .../column-item-tolerance-infinite.html.ini   |    2 +
 .../row-initial-item-tolerance.html.ini       |    2 +
 .../row-item-tolerance-infinite.html.ini      |    2 +
 .../masonry-item-placement-008.html.ini       |    2 +
 ...onry-rows-with-grid-width-changed.html.ini |    2 +
 .../row-auto-placement-001.html.ini           |    2 +
 .../row-auto-placement-002.html.ini           |    2 +
 .../row-auto-placement-max-content.html.ini   |    2 +
 .../row-auto-placement-min-content.html.ini   |    2 +
 ...late-columns-computed-withcontent.html.ini |   41 +-
 ...order-property-auto-placement-001.html.ini |    2 +
 ...order-property-auto-placement-002.html.ini |    2 +
 ...order-property-auto-placement-003.html.ini |    2 +
 ...order-property-auto-placement-004.html.ini |    2 +
 ...order-property-auto-placement-005.html.ini |    2 +
 ...order-property-auto-placement-001.html.ini |    2 +
 ...order-property-auto-placement-002.html.ini |    2 +
 ...order-property-auto-placement-003.html.ini |    2 +
 ...order-property-auto-placement-004.html.ini |    2 +
 ...order-property-auto-placement-005.html.ini |    2 +
 .../parsing/masonry-parsing.html.ini          |  120 -
 .../row-min-max-content-container.html.ini    |    2 +
 .../column-auto-repeat-001.html.ini           |    2 +
 .../column-auto-repeat-002.html.ini           |    2 +
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 .../column-auto-repeat-008.html.ini           |   36 +
 .../column-auto-repeat-009.html.ini           |    9 +
 .../column-auto-repeat-010.html.ini           |    3 +
 .../column-auto-repeat-011.html.ini           |   12 +
 .../column-auto-repeat-012.html.ini           |   12 +
 .../column-auto-repeat-013.html.ini           |    2 +
 .../column-auto-repeat-014.html.ini           |    2 +
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 .../column-auto-repeat-018.html.ini           |    2 +
 .../column-auto-repeat-019.html.ini           |    3 +
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 .../column-auto-repeat-021.html.ini           |    2 +
 .../column-auto-repeat-022.html.ini           |    2 +
 .../column-auto-repeat-023.html.ini           |    2 +
 .../column-auto-repeat-024.html.ini           |    3 +
 .../column-auto-repeat-025.html.ini           |    3 +
 .../column-auto-repeat-026.html.ini           |    2 +
 .../column-auto-repeat-auto-001.html.ini      |    2 +
 .../column-auto-repeat-auto-002.html.ini      |    2 +
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 .../column-auto-repeat-auto-004.html.ini      |    2 +
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 .../column-auto-repeat-auto-006.html.ini      |    2 +
 .../column-auto-repeat-auto-007.html.ini      |    2 +
 .../column-auto-repeat-auto-009.html.ini      |   24 +
 .../column-auto-repeat-auto-010.html.ini      |   12 +
 .../column-auto-repeat-auto-011.html.ini      |    2 +
 .../column-auto-repeat-auto-012.html.ini      |    2 +
 .../column-auto-repeat-auto-013.html.ini      |    2 +
 .../column-auto-repeat-auto-014.html.ini      |    2 +
 .../column-auto-repeat-auto-015.html.ini      |    3 +
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 .../column-auto-repeat-auto-019.html.ini      |    2 +
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 .../column-auto-repeat-auto-024.html.ini      |    3 +
 .../column-auto-repeat-auto-025.html.ini      |    2 +
 .../column-auto-repeat-auto-027.html.ini      |    3 +
 .../column-auto-repeat-auto-029.html.ini      |    2 +
 ...olumn-auto-repeat-fit-content-001.html.ini |    2 +
 ...olumn-auto-repeat-fit-content-002.html.ini |    2 +
 ...olumn-auto-repeat-fit-content-003.html.ini |    2 +
 ...olumn-auto-repeat-fit-content-004.html.ini |    2 +
 ...olumn-auto-repeat-fit-content-005.html.ini |    2 +
 ...olumn-auto-repeat-max-content-001.html.ini |    2 +
 ...olumn-auto-repeat-max-content-002.html.ini |    2 +
 ...olumn-auto-repeat-max-content-003.html.ini |    2 +
 ...olumn-auto-repeat-max-content-004.html.ini |    2 +
 ...olumn-auto-repeat-min-content-001.html.ini |    2 +
 ...olumn-auto-repeat-min-content-002.html.ini |    2 +
 ...olumn-auto-repeat-min-content-003.html.ini |    2 +
 ...olumn-auto-repeat-min-content-004.html.ini |    2 +
 ...olumn-auto-repeat-min-content-005.html.ini |    2 +
 ...n-auto-repeat-mixed-intrinsic-001.html.ini |    2 +
 ...n-auto-repeat-mixed-intrinsic-002.html.ini |    2 +
 ...n-auto-repeat-mixed-intrinsic-003.html.ini |    2 +
 ...n-auto-repeat-mixed-intrinsic-004.html.ini |    2 +
 .../row-auto-repeat-auto-001.html.ini         |    2 +
 .../row-auto-repeat-auto-002.html.ini         |    2 +
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 .../row-auto-repeat-auto-022.html.ini         |    2 +
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 .../row-auto-repeat-fit-content-001.html.ini  |    2 +
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 .../row-auto-repeat-fit-content-005.html.ini  |    2 +
 .../row-auto-repeat-max-content-001.html.ini  |    2 +
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 .../row-auto-repeat-min-content-001.html.ini  |    2 +
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 ...w-auto-repeat-mixed-intrinsic-001.html.ini |    2 +
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 .../column-track-sizing-001.html.ini          |    2 +
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 ...izing-check-grid-height-on-resize.html.ini |    2 +
 ...sonry-track-sizing-explicit-block.html.ini |    2 +
 ...y-track-sizing-overflow-left-side.html.ini |    2 +
 ...-track-sizing-overflow-right-side.html.ini |    2 +
 .../masonry-track-sizing-span-row.html.ini    |    2 +
 .../row-track-sizing-001.html.ini             |    2 +
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 ...e-clamp-with-abspos-017.tentative.html.ini |    2 -
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 ...ebkit-line-clamp-with-line-height.html.ini |    2 +
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 ...webkit-line-clamp-with-max-height.html.ini |    2 +
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 .../meta/css/css-ui/caret-eol-001.html.ini    |    2 +
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 .../css/css-values/typed_arithmetic.html.ini  |   24 +
 .../valid-custom-element-names.html.ini       |  330 +
 .../max-payload.https.window.js.ini           |    1 +
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 ...css-font-face.https.sub.tentative.html.ini |    3 -
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 ...tion-unload-cross-origin.sub.window.js.ini |    3 -
 ...avigation-unload-same-origin.window.js.ini |    3 +
 .../meta/html/dom/idlharness.https.html.ini   |   12 +
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 ...rame_sandbox_popups_nonescaping-1.html.ini |    1 +
 ...rame_sandbox_popups_nonescaping-2.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-3.html.ini |    1 -
 .../urlencoded2.window.js.ini                 |    3 -
 .../html/semantics/forms/historical.html.ini  |    3 -
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 ...anchor-multicol-display.tentative.html.ini |    3 +
 .../meta/preload/preload-error.sub.html.ini   |    3 +
 ...nested-context-navigations-iframe.html.ini |   25 +
 .../trusted-types-navigation.html.ini         |    3 -
 .../wpt/meta/wasm/jsapi/idlharness.any.js.ini |   24 +
 .../k-rate-audioworklet.https.html.ini        |    3 +
 .../nan-param.html.ini                        |    2 +
 .../retrospective-setTargetAtTime.html.ini    |    3 +
 .../audioworklet-audioparam.https.html.ini    |    3 +
 ...kletnode-disconnected-input.https.html.ini |    3 +
 .../active-processing.https.html.ini          |    6 +
 .../waveshaper-copy-curve.html.ini            |    3 +
 .../scroll_into_view.py.ini                   |    3 +
 .../alpha/sharedworker-in-worker.html.ini     |    1 +
 .../.github/workflows/update-wasm-tests.yml   |    7 +-
 tests/wpt/tests/.well-known/web-identity      |   61 +-
 ....any.js => idbindex_getAll-options.any.js} |    0
 ....js => idbindex_getAllKeys-options.any.js} |    0
 ...e.any.js => idbindex_getAllRecords.any.js} |    0
 ...s => idbobjectstore_getAll-options.any.js} |    0
 ... idbobjectstore_getAllKeys-options.any.js} |    0
 ...js => idbobjectstore_getAllRecords.any.js} |    0
 tests/wpt/tests/close-watcher/META.yml        |    3 +-
 tests/wpt/tests/common/get-host-info.sub.js   |    2 +
 tests/wpt/tests/console/META.yml              |    1 -
 .../resources/container-timing-helpers.js     |   11 +-
 ...ng-observe-after-paint-with-buffering.html |    8 +-
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 tests/wpt/tests/cookies/README.md             |    9 +-
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diff --git a/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
index b275cb58343..292dc852b9f 100644
--- a/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
@@ -12,6 +12,3 @@
 
   [Revoke blob URL after creating Request, then clone Request, will fetch]
     expected: FAIL
-
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
diff --git a/tests/wpt/meta/IndexedDB/idbindex_getAll-options.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbindex_getAll-options.any.js.ini
similarity index 92%
rename from tests/wpt/meta/IndexedDB/idbindex_getAll-options.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbindex_getAll-options.any.js.ini
index a84b6960aa2..d2c4ea4f97a 100644
--- a/tests/wpt/meta/IndexedDB/idbindex_getAll-options.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbindex_getAll-options.any.js.ini
@@ -1,4 +1,4 @@
-[idbindex_getAll-options.tentative.any.html]
+[idbindex_getAll-options.any.html]
   [Single item get]
     expected: FAIL
 
@@ -78,10 +78,7 @@
     expected: FAIL
 
 
-[idbindex_getAll-options.tentative.any.sharedworker.html]
-  expected: ERROR
-
-[idbindex_getAll-options.tentative.any.worker.html]
+[idbindex_getAll-options.any.worker.html]
   [Single item get]
     expected: FAIL
 
@@ -161,5 +158,8 @@
     expected: FAIL
 
 
-[idbindex_getAll-options.tentative.any.serviceworker.html]
+[idbindex_getAll-options.any.serviceworker.html]
+  expected: ERROR
+
+[idbindex_getAll-options.any.sharedworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.any.js.ini
similarity index 91%
rename from tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.any.js.ini
index 41425a0e42b..c8f902b0322 100644
--- a/tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbindex_getAllKeys-options.any.js.ini
@@ -1,10 +1,4 @@
-[idbindex_getAllKeys-options.tentative.any.sharedworker.html]
-  expected: ERROR
-
-[idbindex_getAllKeys-options.tentative.any.serviceworker.html]
-  expected: ERROR
-
-[idbindex_getAllKeys-options.tentative.any.html]
+[idbindex_getAllKeys-options.any.html]
   [Single item get]
     expected: FAIL
 
@@ -81,7 +75,7 @@
     expected: FAIL
 
 
-[idbindex_getAllKeys-options.tentative.any.worker.html]
+[idbindex_getAllKeys-options.any.worker.html]
   [Single item get]
     expected: FAIL
 
@@ -156,3 +150,10 @@
 
   [Get all keys with invalid query keys]
     expected: FAIL
+
+
+[idbindex_getAllKeys-options.any.serviceworker.html]
+  expected: ERROR
+
+[idbindex_getAllKeys-options.any.sharedworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/IndexedDB/idbindex_getAllRecords.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbindex_getAllRecords.any.js.ini
similarity index 92%
rename from tests/wpt/meta/IndexedDB/idbindex_getAllRecords.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbindex_getAllRecords.any.js.ini
index cf261c28981..26a7407178b 100644
--- a/tests/wpt/meta/IndexedDB/idbindex_getAllRecords.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbindex_getAllRecords.any.js.ini
@@ -1,4 +1,7 @@
-[idbindex_getAllRecords.tentative.any.html]
+[idbindex_getAllRecords.any.serviceworker.html]
+  expected: ERROR
+
+[idbindex_getAllRecords.any.worker.html]
   [Single item]
     expected: FAIL
 
@@ -75,13 +78,10 @@
     expected: FAIL
 
 
-[idbindex_getAllRecords.tentative.any.serviceworker.html]
+[idbindex_getAllRecords.any.sharedworker.html]
   expected: ERROR
 
-[idbindex_getAllRecords.tentative.any.sharedworker.html]
-  expected: ERROR
-
-[idbindex_getAllRecords.tentative.any.worker.html]
+[idbindex_getAllRecords.any.html]
   [Single item]
     expected: FAIL
 
diff --git a/tests/wpt/meta/IndexedDB/idbobjectstore_get.any.js.ini b/tests/wpt/meta/IndexedDB/idbobjectstore_get.any.js.ini
index 52a5587c7c9..f649c790758 100644
--- a/tests/wpt/meta/IndexedDB/idbobjectstore_get.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbobjectstore_get.any.js.ini
@@ -5,6 +5,9 @@
   [When an invalid key is used, throw DataError]
     expected: FAIL
 
+  [Attempts to retrieve a record that doesn't exist]
+    expected: FAIL
+
 
 [idbobjectstore_get.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.any.js.ini
similarity index 90%
rename from tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.any.js.ini
index f55d3578c03..49442d2c794 100644
--- a/tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbobjectstore_getAll-options.any.js.ini
@@ -1,4 +1,4 @@
-[idbobjectstore_getAll-options.tentative.any.worker.html]
+[idbobjectstore_getAll-options.any.worker.html]
   [Single item get]
     expected: FAIL
 
@@ -69,13 +69,13 @@
     expected: FAIL
 
 
-[idbobjectstore_getAll-options.tentative.any.serviceworker.html]
+[idbobjectstore_getAll-options.any.serviceworker.html]
   expected: ERROR
 
-[idbobjectstore_getAll-options.tentative.any.sharedworker.html]
+[idbobjectstore_getAll-options.any.sharedworker.html]
   expected: ERROR
 
-[idbobjectstore_getAll-options.tentative.any.html]
+[idbobjectstore_getAll-options.any.html]
   [Single item get]
     expected: FAIL
 
diff --git a/tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.any.js.ini
similarity index 88%
rename from tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.any.js.ini
index 2c87d430144..1808ea1165e 100644
--- a/tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbobjectstore_getAllKeys-options.any.js.ini
@@ -1,4 +1,4 @@
-[idbobjectstore_getAllKeys-options.tentative.any.worker.html]
+[idbobjectstore_getAllKeys-options.any.worker.html]
   [Single item get]
     expected: FAIL
 
@@ -60,10 +60,13 @@
     expected: FAIL
 
 
-[idbobjectstore_getAllKeys-options.tentative.any.serviceworker.html]
+[idbobjectstore_getAllKeys-options.any.serviceworker.html]
   expected: ERROR
 
-[idbobjectstore_getAllKeys-options.tentative.any.html]
+[idbobjectstore_getAllKeys-options.any.sharedworker.html]
+  expected: ERROR
+
+[idbobjectstore_getAllKeys-options.any.html]
   [Single item get]
     expected: FAIL
 
@@ -123,7 +126,3 @@
 
   [Get all keys with both options and count]
     expected: FAIL
-
-
-[idbobjectstore_getAllKeys-options.tentative.any.sharedworker.html]
-  expected: ERROR
diff --git a/tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.tentative.any.js.ini b/tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.any.js.ini
similarity index 91%
rename from tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.tentative.any.js.ini
rename to tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.any.js.ini
index 9875e4ae3a6..f5de8c08cd1 100644
--- a/tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.tentative.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idbobjectstore_getAllRecords.any.js.ini
@@ -1,4 +1,10 @@
-[idbobjectstore_getAllRecords.tentative.any.worker.html]
+[idbobjectstore_getAllRecords.any.serviceworker.html]
+  expected: ERROR
+
+[idbobjectstore_getAllRecords.any.sharedworker.html]
+  expected: ERROR
+
+[idbobjectstore_getAllRecords.any.worker.html]
   [Single item]
     expected: FAIL
 
@@ -75,7 +81,7 @@
     expected: FAIL
 
 
-[idbobjectstore_getAllRecords.tentative.any.html]
+[idbobjectstore_getAllRecords.any.html]
   [Single item]
     expected: FAIL
 
@@ -150,10 +156,3 @@
 
   [Get all records with invalid query keys]
     expected: FAIL
-
-
-[idbobjectstore_getAllRecords.tentative.any.sharedworker.html]
-  expected: ERROR
-
-[idbobjectstore_getAllRecords.tentative.any.serviceworker.html]
-  expected: ERROR
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index 4fe2b2729cf..1df888bedf6 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -3056,6 +3056,44 @@
        {}
       ]
      ],
+     "masonry": {
+      "tentative": {
+       "track-sizing": {
+        "auto-repeat": {
+         "auto-repeat-no-children-crash.html": [
+          "2ca64b0db4c2fa829f34b678bbe4f629cb2cb2fd",
+          [
+           null,
+           {}
+          ]
+         ],
+         "intrinsic-auto-repeat": {
+          "column-auto-repeat-auto-no-items-crash.html": [
+           "a9d25eb27493b35bca0de09ce0b8fb0d2eda1ecd",
+           [
+            null,
+            {}
+           ]
+          ],
+          "repeat-auto-fit-auto-crash.html": [
+           "07b44c16a83449e31367a9684b33c5e8d95994a6",
+           [
+            null,
+            {}
+           ]
+          ],
+          "row-auto-repeat-auto-no-items-crash.html": [
+           "1a89c065cd3ced12ef8df8e641011b90d96fa173",
+           [
+            null,
+            {}
+           ]
+          ]
+         }
+        }
+       }
+      }
+     },
      "parsing": {
       "grid-template-columns-crash.html": [
        "61bdfd8177a7343ce19cc24f97749cdc3ce3274b",
@@ -6149,6 +6187,13 @@
        {}
       ]
      ],
+     "typed-arithmetic-different-categories-crash.html": [
+      "e3dd6bbdabb5303caa98a07273a0c97fd62c2a00",
+      [
+       null,
+       {}
+      ]
+     ],
      "typed-arithmetic-inside-calc-crash.html": [
       "485c9967a9794b8536f88e66594814070ebcaadd",
       [
@@ -6347,7 +6392,14 @@
         ]
        ]
       }
-     }
+     },
+     "table-root-transition-crash.html": [
+      "48fe0f273baccaf20eb6f6213852d4e0ce82f3ac",
+      [
+       null,
+       {}
+      ]
+     ]
     },
     "css-viewport": {
      "zoom": {
@@ -26245,7 +26297,7 @@
    "navigation-api": {
     "scroll-behavior": {
      "after-transition-with-history-scroll-restoration-manual.html": [
-      "bc2ce230ce729dcc5cc8bfcd0100ab0aa75d22ba",
+      "bec62ae37ae71bb206832c832c1a84b565ca431a",
       [
        null,
        {}
@@ -126725,6 +126777,19 @@
      }
     },
     "css-anchor-position": {
+     "align-dialog-002.html": [
+      "d0164ca104670264e33e97061a5f197eaa7495b7",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/align-dialog-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anchor-center-002.html": [
       "b7f61003a67be5baf897fa5a9c7da982586820b1",
       [
@@ -126933,6 +126998,32 @@
        {}
       ]
      ],
+     "anchor-position-grid-001.html": [
+      "8d0c4381d50797003162bc0de36a024644f10908",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/anchor-position-grid-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-inline-004.html": [
+      "12220bcc87d0ee2d2b8da619de7817610e3a5d4d",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/anchor-position-inline-004-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anchor-position-multicol-002.html": [
       "37d31e7137956ebdddfbfb292d4d7a859f35e8d5",
       [
@@ -126973,7 +127064,7 @@
       ]
      ],
      "anchor-position-multicol-007.html": [
-      "b8aca1164479d58f0c7c28720362a96d017f5463",
+      "2302731c7376d50ed2001edd204391237dc127c1",
       [
        null,
        [
@@ -126986,7 +127077,7 @@
       ]
      ],
      "anchor-position-multicol-008.html": [
-      "f652b6ac2b05d28850f1d732d017cdff9c02e848",
+      "7704df90b1e18256b580697f6030716d16456c9f",
       [
        null,
        [
@@ -127011,6 +127102,84 @@
        {}
       ]
      ],
+     "anchor-position-multicol-012.html": [
+      "7618dd809331719027ce3ef7c8f64363e9c9de03",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-multicol-013.html": [
+      "10a37a0ad6431edb8c849288cb63cc4cd9886a26",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-multicol-014.html": [
+      "969ec8f3c429969c36a1e1a969d10ef399a13644",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-multicol-015.html": [
+      "1a5c2881de6fd97024f8671567fd36332fabeb77",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-multicol-016.html": [
+      "85eddfca08b1ccd67cdec412c2c07fc06b1080b7",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "anchor-position-multicol-017.html": [
+      "3e8c35a9d3c844a3b5fb9fa87fb81a47f5d9850d",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anchor-position-multicol-colspan-003.html": [
       "e985cebfb807f65d7413d81885f6d2be7234b2a9",
       [
@@ -127037,6 +127206,19 @@
        {}
       ]
      ],
+     "anchor-position-multicol-nested-001.html": [
+      "70a8e2a7bfb54394fcba7ffe64b6d87d6beb9401",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/anchor-position-multicol-nested-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anchor-position-non-anchored-fallback.html": [
       "26965fe8bf413ca199dae0a09940d46f0b29f62c",
       [
@@ -127181,12 +127363,12 @@
       ]
      ],
      "anchor-scroll-chained-003.html": [
-      "5f4c0ff30060455573facb3ae224ab8a3e147557",
+      "213da7ead5a60a2b608656f17eb07dd8d029d201",
       [
        null,
        [
         [
-         "/css/css-anchor-position/reference/anchor-scroll-chained-002-ref.html",
+         "/css/css-anchor-position/reference/anchor-scroll-chained-003-ref.html",
          "=="
         ]
        ],
@@ -127547,6 +127729,19 @@
        {}
       ]
      ],
+     "anchored-transition-display-none.html": [
+      "8628d5311f08f6db8269ede079a3bf9ec71a7a02",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/anchored-transition-display-none-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "container-queries": {
       "anchored-fallback-color-change.html": [
        "5437e3b9a283b29e594c3516dcf282a5100c7106",
@@ -127588,6 +127783,19 @@
        {}
       ]
      ],
+     "no-anchor-anchor-center.html": [
+      "a3ac8477edde93835e934d97b9eb9c73c5d8740f",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/no-anchor-anchor-center-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "position-anchor-001.html": [
       "b0a964485c65ed1c8eeff89a1406bda9f4ea9b48",
       [
@@ -128082,6 +128290,19 @@
        {}
       ]
      ],
+     "position-visibility-no-overflow-nested.html": [
+      "0d35dec74082063b905226e84aa3298248368e09",
+      [
+       null,
+       [
+        [
+         "/css/css-anchor-position/position-visibility-no-overflow-nested-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "position-visibility-no-overflow-scroll.html": [
       "f646f819cddfbf955b36eb7b7d17802a040f9bef",
       [
@@ -176598,7 +176819,7 @@
       ]
      ],
      "flexbox-align-self-vert-rtl-001.xhtml": [
-      "a32ed619c88656b30d1387b9ec45edbbccc56574",
+      "2267d67c2447cd4770b95170676656de08583589",
       [
        null,
        [
@@ -176614,7 +176835,7 @@
           [
            [
             0,
-            60
+            120
            ],
            [
             0,
@@ -176627,7 +176848,7 @@
       ]
      ],
      "flexbox-align-self-vert-rtl-002.xhtml": [
-      "a3a81e25d10a86d8a729ecec36afb1d0e0bf578d",
+      "614e32f0833724b36f69e4e70950a30682287068",
       [
        null,
        [
@@ -176636,7 +176857,23 @@
          "=="
         ]
        ],
-       {}
+       {
+        "fuzzy": [
+         [
+          null,
+          [
+           [
+            0,
+            120
+           ],
+           [
+            0,
+            101
+           ]
+          ]
+         ]
+        ]
+       }
       ]
      ],
      "flexbox-align-self-vert-rtl-003.xhtml": [
@@ -189758,6 +189995,229 @@
       ]
      },
      "grid": {
+      "fragmentation": {
+       "grid-gap-decorations-fragmentation-001.html": [
+        "41a479196a80e8f8afc424f97aa62cc64b2ba0e0",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-002.html": [
+        "d36bcf459d5e93ba2f60d54f3c14c7904df17a96",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-003.html": [
+        "6de4c188cbf1d3967f49d5f0aaf434167b390da0",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-004.html": [
+        "a0b10cbcbb07c93bdb4f69756b5637439db5f2f4",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-005.html": [
+        "52ee98a6310bdeaf434e6e729511a608029aae74",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-006.html": [
+        "312e0bf01e92ffa2069c67f29706668ee4012b96",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-007.html": [
+        "5e6fc53ac745475947efae96f76801ee7455df11",
+        [
+         null,
+         [
+          [
+           "/css/reference/ref-filled-green-100px-square.xht",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-008.html": [
+        "763ebc14463344c999810034375fa2ac1cf544a6",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-009.html": [
+        "99f9297a046990c6a83077b593d52fdda411708e",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-010.html": [
+        "f2775ff6a94c908c0021ea7bfa72159135e98e82",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-011.html": [
+        "620aeb22746be9715a8bff1b3c5147e12b5eb952",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-012.html": [
+        "c4a151785a137206e18f04ea5f5caf834f1e281e",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-013.html": [
+        "4cd158993c76339139fdd0b611e01f90cd979e80",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-014.html": [
+        "1615e42eb3260f3c42134399e3f825eb56d4ecf7",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-015.html": [
+        "14c46907e68900018be7b257f28492a7536c3059",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-016.html": [
+        "9916d91fdc824a957b2a33b1d1a525e93fb032bf",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
+       "grid-gap-decorations-fragmentation-017.html": [
+        "891d93edac79b94fc54dda0c02ab2f3b6146eac0",
+        [
+         null,
+         [
+          [
+           "/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ]
+      },
       "grid-gap-decorations-001.html": [
        "648f3f26e56892732d8db78ae0e8a852694f9679",
        [
@@ -190712,7 +191172,7 @@
        ]
       ],
       "multicol-gap-decorations-009.html": [
-       "b00c6a70f8abf9894e548d9e40882e396ed5b1f0",
+       "70b2dd18c768b815bd6e6f2546c8a5b8357eaff2",
        [
         null,
         [
@@ -190841,6 +191301,19 @@
         {}
        ]
       ],
+      "multicol-gap-decorations-020.html": [
+       "68fd30cb5e5e2b166cd8e3cf334ad7687de6854f",
+       [
+        null,
+        [
+         [
+          "/css/css-gaps/multicol/multicol-gap-decorations-020-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "multicol-gap-intersections-018.html": [
        "b8f8e1619a0dc25c6824cb2cd441635d93885e06",
        [
@@ -198641,8 +199114,47 @@
         ]
        },
        "alignment": {
+        "column-justify-items-center-001.html": [
+         "bfc942603721cfab4cae245a0e8441067e7393d8",
+         [
+          null,
+          [
+           [
+            "/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001-ref.html",
+            "=="
+           ]
+          ],
+          {}
+         ]
+        ],
+        "column-justify-items-end-justify-self-start-001.html": [
+         "fda9aeab3d2f0fa565b1f69d741bdfa1e06f5e28",
+         [
+          null,
+          [
+           [
+            "/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001-ref.html",
+            "=="
+           ]
+          ],
+          {}
+         ]
+        ],
+        "column-overflow-alignment-001.html": [
+         "a60df86dc9f1c5b6280bd000d0ab21f77c5753da",
+         [
+          null,
+          [
+           [
+            "/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001-ref.html",
+            "=="
+           ]
+          ],
+          {}
+         ]
+        ],
         "masonry-align-content-001.html": [
-         "fe6dd1a5d125b5614ac608bd3e6c6eff2f8db64f",
+         "ea06e04a3581dd77cde3e3c87c11f23719e64a20",
          [
           null,
           [
@@ -198655,7 +199167,7 @@
          ]
         ],
         "masonry-align-content-002.html": [
-         "15fd7d1a003afb2dc13e1057cb00f1a4ffc9bddc",
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       "pointerevents/pointerevent_click_is_a_pointerevent.html?mouse",
       {
@@ -786715,6 +791135,15 @@
       }
      ]
     ],
+    "pointerevent_touch-propagates-when-target-is-video_touch.html": [
+     "47d1f4652d8190edff3a6790c30214aba53ae2fb",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "pointerlock": {
      "pointerevent_coordinates_when_locked.html": [
       "a79327252277d3b27e416e885b27ff6cb0b0bf5d",
@@ -801843,7 +806272,7 @@
      ]
     ],
     "sanitizer-basic-filtering.tentative.html": [
-     "0be3604ecfe4a3fb189a63c4c346ddaddf85f95d",
+     "2e61a9ab9b40537a0d4edb0c952f03c9c3382b7b",
      [
       null,
       {}
@@ -801857,7 +806286,14 @@
      ]
     ],
     "sanitizer-config.tentative.html": [
-     "a782b5a7e07024cd6db6bdfcec39c844054767fd",
+     "708139106f7eb4de72f1f4e3efdd83115fb12755",
+     [
+      null,
+      {}
+     ]
+    ],
+    "sanitizer-modifiers.tentative.html": [
+     "de2426602578021a1a86134ed443328fcef3f97d",
      [
       null,
       {}
@@ -801878,7 +806314,7 @@
      ]
     ],
     "sanitizer-removeUnsafe.tentative.html": [
-     "7ad8253ad5fdec29b79c590e50e9c0d211d17031",
+     "7e50729712b3ec80bd5438997133667f4f29b384",
      [
       null,
       {}
@@ -804179,7 +808615,7 @@
       ]
      ],
      "animation-trigger-late-attached-timeline.tentative.html": [
-      "22bcf9990b561d658de2987d023fc8fe00434dd0",
+      "7b5317aa42d6f5347b98c1fc56e3dd08c1da1f9d",
       [
        null,
        {}
@@ -804355,14 +808791,14 @@
        ]
       ],
       "timeline-trigger-shorthand.tentative.html": [
-       "bcc96189e07fd982b54d0114aef257af9d6ad5b8",
+       "51dc3611a6ec5f42724af462337c2c4882738ea7",
        [
         null,
         {}
        ]
       ],
-      "timeline-trigger-timeline-parsing.tentative.html": [
-       "61bef268f23ee70441008fd2b471c0128fb0160a",
+      "timeline-trigger-source-parsing.tentative.html": [
+       "f743d3b87d0bdc4f38ae2af5f31d873e118362b4",
        [
         null,
         {}
@@ -805077,7 +809513,7 @@
       ]
      ],
      "setting-current-time.html": [
-      "5daa459bbeb88523a8713afed25b5d35785a61f0",
+      "3b2f4adcc8ff81e52b8c69abd36591e38ec57665",
       [
        null,
        {}
@@ -805091,21 +809527,21 @@
       ]
      ],
      "setting-playback-rate.html": [
-      "e7e96a27e1ff3961b66139fb5fae6d2ac82e9fff",
+      "82365a593e6cf9b59a1f4507b7a5b3c8452e0611",
       [
        null,
        {}
       ]
      ],
      "setting-start-time.html": [
-      "d950eb8188de218be712b6fedbf0f7b312e7d27c",
+      "6f21e8d25d77b5f0aa92ce655cc65ebbe355d5a8",
       [
        null,
        {}
       ]
      ],
      "setting-timeline.tentative.html": [
-      "5502e133679b89c25bd9350ff2a6560a06b36e8d",
+      "17ca5d0557eb729fe21f6323b75f238dc4a950a8",
       [
        null,
        {}
@@ -805142,21 +809578,21 @@
       ]
      ],
      "block-view-timeline-current-time-vertical-rl.tentative.html": [
-      "34a9bf878580a65c9eec70f1850b53abfaafa494",
+      "cf1542b4a8046e79906f613c08e4b0927350d66e",
       [
        null,
        {}
       ]
      ],
      "block-view-timeline-current-time.tentative.html": [
-      "e0e9c0fcd3c032918d415dd08ff5e7974b047464",
+      "7ca53eada36926df2ef2af6cca8c47d707133f9a",
       [
        null,
        {}
       ]
      ],
      "block-view-timeline-nested-subject.tentative.html": [
-      "d6481db4de941fa865df92f8bda1158622d1499b",
+      "fee9a601179522df407772d842ee080c4df912dd",
       [
        null,
        {}
@@ -805198,14 +809634,14 @@
       ]
      ],
      "inline-subject.html": [
-      "6b1d216dea154829b86defb2307caf508189a3c8",
+      "e70e9ba53ea1ba961a9be95d30384d825ceb6bfe",
       [
        null,
        {}
       ]
      ],
      "inline-view-timeline-current-time.tentative.html": [
-      "fc7a59c18feb2f62b3ba0147ca5ecc17aa40b0cb",
+      "a4b22da5bb378d4c7c32a64c9b2cbb4d77bf7a23",
       [
        null,
        {}
@@ -805305,14 +809741,14 @@
       ]
      ],
      "view-timeline-get-current-time-range-name.tentative.html": [
-      "c6920143ee151d69aae63bdd97661ad64bc48adc",
+      "953048ca7fde42aa97ef379100a21ec1517dd386",
       [
        null,
        {}
       ]
      ],
      "view-timeline-get-set-range.html": [
-      "7bf4516700cea883b94638b2d1d8cbd705ce3173",
+      "657ad6046b4f2a976ec6c83fb7d0fca2a3eb0f05",
       [
        null,
        {}
@@ -805361,7 +809797,7 @@
       ]
      ],
      "view-timeline-snapport.html": [
-      "5d68d37037a344f4b514e5cd937500abbc66e43c",
+      "8e9f8033b914fe70956c3196e2c613fb2bd6847d",
       [
        null,
        {}
@@ -813594,6 +818030,15 @@
     ],
     "detection": {
      "tentative": {
+      "navigation-api-precommit-handler.html": [
+       "14c2d8873af95dd52716eac930c581faea297d70",
+       [
+        null,
+        {
+         "testdriver": true
+        }
+       ]
+      ],
       "node-with-image-pseudo-element-and-text.html": [
        "d3df02fb10c945ec7b9dc52a1a3b96cd49bdbaec",
        [
@@ -819155,7 +823600,7 @@
      ]
     ],
     "storageAccess.testdriver.sub.html": [
-     "cc945dd18232b725f93e5b877f39be664ce56997",
+     "4eb017e583465f3a5ba29e4b68397f5381114b4b",
      [
       null,
       {
@@ -835252,7 +839697,14 @@
        ]
       ],
       "SVGPoint.html": [
-       "cdf44e29f20bd3440195752f4122d758a4d24659",
+       "59952ac5877b988c1def11ee84b907bb203dbd30",
+       [
+        null,
+        {}
+       ]
+      ],
+      "SVGRect.html": [
+       "e1dae405d81d81f1e79013de300f1f22af7c00a4",
        [
         null,
         {}
@@ -836362,7 +840814,7 @@
      ]
     ],
     "navigate-to-javascript-url-001.html": [
-     "1598cfc25c7e2c97542b36de699fac73e9a1e692",
+     "92c059bb011d05221ef0e0e37c0a395bef153cbc",
      [
       null,
       {}
@@ -836434,7 +840886,7 @@
      ]
     ],
     "require-trusted-types-for-TypeError-belongs-to-the-global-object-realm.html": [
-     "07a973030270a6341e2a2d63434eaf11e7d33a90",
+     "fe16e8645b971bc823ab044ec4cd03ed6e028548",
      [
       null,
       {}
@@ -855812,7 +860264,7 @@
        ]
       ],
       "k-rate-audioworklet.https.html": [
-       "e891da6da2b02924aac74b9e850677dc080b57b0",
+       "9e239d3a31d405804dabc1d127ca2d87aa9c3f61",
        [
         null,
         {}
@@ -855917,7 +860369,7 @@
        ]
       ],
       "nan-param.html": [
-       "e9b8f0accbd1b0359275615f3ef12bd7e9317c4f",
+       "1993d23debeb58abeeb943bbec174a16c523051f",
        [
         null,
         {}
@@ -855938,7 +860390,7 @@
        ]
       ],
       "retrospective-setTargetAtTime.html": [
-       "41a37bdb913efbf7a9c392b1130cc0bd9a65c251",
+       "18beca5d2e79c190656069b28b93489e4dbc0dbd",
        [
         null,
         {}
@@ -856010,7 +860462,7 @@
        ]
       ],
       "audioworklet-audioparam.https.html": [
-       "8e51470f646f63abaed321c3efd3e9e25906edea",
+       "2644dc870f7090ae6dd55ef416772d54509d3f6d",
        [
         null,
         {}
@@ -856122,7 +860574,7 @@
        ]
       ],
       "audioworkletnode-disconnected-input.https.html": [
-       "c58502af01192c13884f303b8345a017af9ad3a9",
+       "481f80c32a05c273bdc80c5db2025468d5f2f6c0",
        [
         null,
         {}
@@ -856447,7 +860899,7 @@
      },
      "the-convolvernode-interface": {
       "active-processing.https.html": [
-       "0712d6bccefd71730994b78cf26caabaaf1d92d2",
+       "b0afc864116b61c6e48755f62f01968c4e3eed29",
        [
         null,
         {}
@@ -856912,7 +861364,7 @@
        ]
       ],
       "panner-rolloff-clamping.html": [
-       "387f87301092ebd725ed240cc70f0df7ec69a5ab",
+       "288f5d0b26e5f38e895bdac12146b26ed754e7fb",
        [
         null,
         {}
@@ -857018,7 +861470,7 @@
        ]
       ],
       "waveshaper-copy-curve.html": [
-       "e897ac08a10abdc5824de6f9548e56a0e313d0c4",
+       "a47b566ea66e5642ea97b2f3adbf540747808561",
        [
         null,
         {}
@@ -882162,7 +886614,7 @@
       ]
      ],
      "tensor.https.any.js": [
-      "cad019ac7d290cf0575e04099f428f87119e4bce",
+      "254e33eb9cc3807f9b526f690c538edde8a08a70",
       [
        "webnn/conformance_tests/tensor.https.any.html?cpu",
        {
@@ -947757,6 +952209,43 @@
           {}
          ]
         ]
+       },
+       "set_download_behavior": {
+        "download_behavior_allowed.py": [
+         "9864a2610db9c51d5d6037f476c843d05d34fbca",
+         [
+          null,
+          {}
+         ]
+        ],
+        "download_behavior_denied.py": [
+         "a0e8442f4a20f29e946a5075c1c4309b4574a70b",
+         [
+          null,
+          {}
+         ]
+        ],
+        "global.py": [
+         "f3200073f7f647cb42b44d12caf926a53ef44ea7",
+         [
+          null,
+          {}
+         ]
+        ],
+        "invalid.py": [
+         "6aa12805a4b38b9a7781ad3c9d0ac386a84d4ad0",
+         [
+          null,
+          {}
+         ]
+        ],
+        "user_context.py": [
+         "e4e4ef14c814cc3498adc2a558211ba88b690cb6",
+         [
+          null,
+          {}
+         ]
+        ]
        }
       },
       "browsing_context": {
@@ -947930,14 +952419,14 @@
        },
        "download_end": {
         "download_end.py": [
-         "8594d91cbaf9bbea4530ca14059b87c9ca4e45c1",
+         "e5bff87889179f467888779b15395d0f57471056",
          [
           null,
           {}
          ]
         ],
         "status.py": [
-         "234448cff2f272b72710a9515e7dff5799807cc8",
+         "2caa3c107df615b3aa245862813d85d78440ad4b",
          [
           null,
           {}
@@ -948558,7 +953047,7 @@
          ]
         ],
         "global.py": [
-         "374052f65748222bbda7216c7c8345a91ea22c1f",
+         "c88c35c0f5cc27b3cb4f3d087fda1db938cf29c2",
          [
           null,
           {}
@@ -948579,7 +953068,7 @@
          ]
         ],
         "user_contexts.py": [
-         "a19bea7a82566f79a23181139db218c013bd8ea8",
+         "97f36a928d309e6fe42e6c8aabf5eaf352622d88",
          [
           null,
           {}
@@ -949212,7 +953701,7 @@
        },
        "before_request_sent": {
         "before_request_sent.py": [
-         "7e80fd7257963db5b6792975b5e3ba0feaaf383b",
+         "f7422e52d91db47b568aa8d0b9f53af1fb00872e",
          [
           null,
           {}
@@ -949407,14 +953896,14 @@
        },
        "get_data": {
         "charset.py": [
-         "3327ae63c188d8992ffe46840f8efaf71b451217",
+         "d166a6ad3b64eadbf643f4d1c3a08bca65cc8c43",
          [
           null,
           {}
          ]
         ],
         "collector.py": [
-         "700a94fa86491fbb03d184cb15b9e9de0bdc5b7a",
+         "0e0217a9414c046163dad4c7f3086efde1733ff4",
          [
           null,
           {}
@@ -949435,7 +953924,7 @@
          ]
         ],
         "request.py": [
-         "da83b3ec720753518cce35999a92269e91e6f8b9",
+         "3ac343eb2785bec13459e75dd47f0288e6cc3f55",
          [
           null,
           {}
@@ -949458,7 +953947,7 @@
          ]
         ],
         "headers.py": [
-         "49248e56eea8471a612dd4378b39712a99395498",
+         "3c32826b2d90c63096ab1e4ad6d61d66c51d6106",
          [
           null,
           {}
@@ -949531,7 +954020,7 @@
        },
        "response_completed": {
         "response_completed.py": [
-         "be1b5fc6b5de90d0754e792aea06ea321812b942",
+         "fe851756617fbfba15b27f92519ec0576dd692cf",
          [
           null,
           {}
@@ -949547,7 +954036,7 @@
        },
        "response_started": {
         "response_started.py": [
-         "0b205f8fa84b9ddb94bd9d7169be4efe5cd58d61",
+         "dd948d2dc8d37b3f7ea56f07294d6a13dab0bd4d",
          [
           null,
           {}
diff --git a/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini b/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
index 6cdbdb3b9d2..16cf7474802 100644
--- a/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
+++ b/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
@@ -5,9 +5,3 @@
 
   [@font-face override between layers]
     expected: [FAIL, PASS]
-
-  [@font-face override update with appended sheet 1]
-    expected: FAIL
-
-  [@font-face override update with appended sheet 2]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html.ini
new file mode 100644
index 00000000000..fc690205310
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html.ini
@@ -0,0 +1,2 @@
+[at-container-scroll-direction-parsing.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html.ini
new file mode 100644
index 00000000000..18b244e961a
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html.ini
@@ -0,0 +1,2 @@
+[at-container-scroll-direction-serialization.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html.ini
new file mode 100644
index 00000000000..ed6d97d5f70
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html.ini
@@ -0,0 +1,2 @@
+[scroll-direction-hv.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html.ini
new file mode 100644
index 00000000000..0de42ffe5c6
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html.ini
@@ -0,0 +1,2 @@
+[scroll-direction-programmatic-absolute-scrolls.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html.ini
new file mode 100644
index 00000000000..3fffa9f6ecc
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html.ini
@@ -0,0 +1,2 @@
+[scroll-direction-programmatic-relative-scrolls.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html.ini
new file mode 100644
index 00000000000..20d3a445973
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html.ini
@@ -0,0 +1,2 @@
+[scroll-direction-wm.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-flexbox/flex-item-content-is-min-width-max-content.html.ini b/tests/wpt/meta/css/css-flexbox/flex-item-content-is-min-width-max-content.html.ini
deleted file mode 100644
index 5ec0a78c145..00000000000
--- a/tests/wpt/meta/css/css-flexbox/flex-item-content-is-min-width-max-content.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[flex-item-content-is-min-width-max-content.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini b/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
index 352995a05da..e09d74d1b9f 100644
--- a/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
+++ b/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
@@ -40,3 +40,6 @@
 
   [@font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)]
     expected: FAIL
+
+  [@font-face matching for quoted and unquoted serif (drawing text in a canvas)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/animation/rule-width-interpolation-repeaters.html.ini b/tests/wpt/meta/css/css-gaps/animation/rule-width-interpolation-repeaters.html.ini
index df9abc7202e..a086da48a5d 100644
--- a/tests/wpt/meta/css/css-gaps/animation/rule-width-interpolation-repeaters.html.ini
+++ b/tests/wpt/meta/css/css-gaps/animation/rule-width-interpolation-repeaters.html.ini
@@ -1096,3 +1096,687 @@
 
   [Web Animations: property <column-rule-width> from neutral to [30px\] at (1.5) should be [30px\]]
     expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (-0.3) should be [7px 17px 17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0) should be [10px 20px 20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.3) should be [13px 23px 23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.6) should be [16px 26px 26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1) should be [20px 30px 30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1.5) should be [25px 35px 35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (-0.3) should be [7px 17px 17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0) should be [10px 20px 20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.3) should be [13px 23px 23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.6) should be [16px 26px 26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1) should be [20px 30px 30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1.5) should be [25px 35px 35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (-0.3) should be [7px 17px 17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0) should be [10px 20px 20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.3) should be [13px 23px 23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.6) should be [16px 26px 26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1) should be [20px 30px 30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1.5) should be [25px 35px 35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (-0.3) should be [7px 17px 17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0) should be [10px 20px 20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.3) should be [13px 23px 23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (0.6) should be [16px 26px 26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1) should be [20px 30px 30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <row-rule-width> from neutral to [20px repeat(2, 30px 30px) 30px\] at (1.5) should be [25px 35px 35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from neutral to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (-0.3) should be [repeat(auto, 17px 17px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0) should be [repeat(auto, 20px 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.3) should be [repeat(auto, 23px 23px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.6) should be [repeat(auto, 26px 26px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1) should be [repeat(auto, 30px 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1.5) should be [repeat(auto, 35px 35px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (-0.3) should be [repeat(auto, 17px 17px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0) should be [repeat(auto, 20px 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.3) should be [repeat(auto, 23px 23px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.6) should be [repeat(auto, 26px 26px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1) should be [repeat(auto, 30px 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1.5) should be [repeat(auto, 35px 35px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (-0.3) should be [repeat(auto, 17px 17px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0) should be [repeat(auto, 20px 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.3) should be [repeat(auto, 23px 23px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.6) should be [repeat(auto, 26px 26px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1) should be [repeat(auto, 30px 30px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1.5) should be [repeat(auto, 35px 35px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (-0.3) should be [repeat(auto, 17px 17px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0) should be [repeat(auto, 20px 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.3) should be [repeat(auto, 23px 23px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (0.6) should be [repeat(auto, 26px 26px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1) should be [repeat(auto, 30px 30px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(auto, 20px)\] to [repeat(auto, 30px 30px)\] at (1.5) should be [repeat(auto, 35px 35px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (-0.3) should be [17px 17px 17px 17px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0) should be [20px 20px 20px 20px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.3) should be [23px 23px 23px 23px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (0.6) should be [26px 26px 26px 26px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1) should be [30px 30px 30px 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(1, 20px)\] to [repeat(2, 30px 30px)\] at (1.5) should be [35px 35px 35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (-0.3) should be [17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0) should be [20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.3) should be [23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.6) should be [26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1) should be [30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1.5) should be [35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (-0.3) should be [17px 17px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0) should be [20px 20px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.3) should be [23px 23px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.6) should be [26px 26px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1) should be [30px 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1.5) should be [35px 35px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (-0.3) should be [17px 17px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0) should be [20px 20px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.3) should be [23px 23px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.6) should be [26px 26px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1) should be [30px 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1.5) should be [35px 35px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (-0.3) should be [17px 17px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0) should be [20px 20px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.3) should be [23px 23px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (0.6) should be [26px 26px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1) should be [30px 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px)\] to [30px\] at (1.5) should be [35px 35px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (-0.3) should be [17px 17px repeat(auto, 17px) 17px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0) should be [20px 20px repeat(auto, 20px) 20px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.3) should be [23px 23px repeat(auto, 23px) 23px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.6) should be [26px 26px repeat(auto, 26px) 26px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1) should be [30px 30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1.5) should be [35px 35px repeat(auto, 35px) 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (-0.3) should be [17px 17px repeat(auto, 17px) 17px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0) should be [20px 20px repeat(auto, 20px) 20px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.3) should be [23px 23px repeat(auto, 23px) 23px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.6) should be [26px 26px repeat(auto, 26px) 26px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1) should be [30px 30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1.5) should be [35px 35px repeat(auto, 35px) 35px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (-0.3) should be [17px 17px repeat(auto, 17px) 17px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0) should be [20px 20px repeat(auto, 20px) 20px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.3) should be [23px 23px repeat(auto, 23px) 23px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.6) should be [26px 26px repeat(auto, 26px) 26px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1) should be [30px 30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1.5) should be [35px 35px repeat(auto, 35px) 35px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (-0.3) should be [17px 17px repeat(auto, 17px) 17px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0) should be [20px 20px repeat(auto, 20px) 20px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.3) should be [23px 23px repeat(auto, 23px) 23px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (0.6) should be [26px 26px repeat(auto, 26px) 26px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1) should be [30px 30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [repeat(2, 20px) repeat(auto, 20px) 20px\] to [30px 30px repeat(auto, 30px) 30px\] at (1.5) should be [35px 35px repeat(auto, 35px) 35px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (0.6) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px 30px repeat(auto, 30px)\] at (1.5) should be [30px 30px repeat(auto, 30px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-behavior:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [CSS Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (-0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.3) should be [20px repeat(auto, 20px)\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (0.6) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
+
+  [Web Animations: property <column-rule-width> from [20px repeat(auto, 20px)\] to [30px repeat(auto, 30px) 30px\] at (1.5) should be [30px repeat(auto, 30px) 30px\]]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html.ini
new file mode 100644
index 00000000000..05ac696cc8f
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html.ini
new file mode 100644
index 00000000000..7c344e2fa13
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html.ini
new file mode 100644
index 00000000000..96eaa59f887
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html.ini
new file mode 100644
index 00000000000..bb0a6e46b84
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html.ini
new file mode 100644
index 00000000000..6333d5d9f10
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html.ini
new file mode 100644
index 00000000000..babe1e55410
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html.ini
new file mode 100644
index 00000000000..a997c7c32ba
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html.ini
new file mode 100644
index 00000000000..b0c14196756
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-008.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html.ini
new file mode 100644
index 00000000000..45292c6e025
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-009.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html.ini
new file mode 100644
index 00000000000..9d1897e7db6
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-010.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html.ini
new file mode 100644
index 00000000000..e4cc2af8e4d
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-011.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html.ini
new file mode 100644
index 00000000000..2209cae5891
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-012.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html.ini
new file mode 100644
index 00000000000..043c10d11f2
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-013.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html.ini
new file mode 100644
index 00000000000..fa16b3f548b
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-014.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html.ini
new file mode 100644
index 00000000000..0e6d55737c0
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-015.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html.ini
new file mode 100644
index 00000000000..27214c5282c
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-016.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html.ini b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html.ini
new file mode 100644
index 00000000000..a71061532fe
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html.ini
@@ -0,0 +1,2 @@
+[grid-gap-decorations-fragmentation-017.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-gaps/multicol/multicol-gap-decorations-020.html.ini b/tests/wpt/meta/css/css-gaps/multicol/multicol-gap-decorations-020.html.ini
new file mode 100644
index 00000000000..d2e3ef906a6
--- /dev/null
+++ b/tests/wpt/meta/css/css-gaps/multicol/multicol-gap-decorations-020.html.ini
@@ -0,0 +1,2 @@
+[multicol-gap-decorations-020.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html.ini
new file mode 100644
index 00000000000..a1f50ad8afd
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html.ini
@@ -0,0 +1,2 @@
+[column-justify-items-center-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html.ini
new file mode 100644
index 00000000000..59821435e35
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html.ini
@@ -0,0 +1,2 @@
+[column-justify-items-end-justify-self-start-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html.ini
new file mode 100644
index 00000000000..9778291e550
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html.ini
@@ -0,0 +1,2 @@
+[column-overflow-alignment-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html.ini
new file mode 100644
index 00000000000..b67ce75bcbb
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html.ini
@@ -0,0 +1,2 @@
+[row-align-items-center-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html.ini
new file mode 100644
index 00000000000..4a7a60d7081
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html.ini
@@ -0,0 +1,2 @@
+[row-align-items-end-align-self-start-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html.ini
new file mode 100644
index 00000000000..9715b317fc3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html.ini
@@ -0,0 +1,2 @@
+[row-overflow-alignment-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/gap/column-gaps-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/gap/column-gaps-001.html.ini
new file mode 100644
index 00000000000..108ce6cde3d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/gap/column-gaps-001.html.ini
@@ -0,0 +1,2 @@
+[column-gaps-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/gap/row-gaps-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/gap/row-gaps-001.html.ini
new file mode 100644
index 00000000000..8efac552bce
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/gap/row-gaps-001.html.ini
@@ -0,0 +1,2 @@
+[row-gaps-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html.ini
new file mode 100644
index 00000000000..ac08d780dbe
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html.ini
@@ -0,0 +1,2 @@
+[column-explicit-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html.ini
new file mode 100644
index 00000000000..16c4678d308
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html.ini
@@ -0,0 +1,2 @@
+[column-explicit-placement-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html.ini
new file mode 100644
index 00000000000..b403008fe75
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html.ini
@@ -0,0 +1,2 @@
+[column-explicit-placement-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html.ini
new file mode 100644
index 00000000000..3d7a50430bb
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html.ini
new file mode 100644
index 00000000000..73869119b30
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html.ini
new file mode 100644
index 00000000000..83446a55abf
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html.ini
new file mode 100644
index 00000000000..56ee4f3ead1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html.ini
new file mode 100644
index 00000000000..7ee476ac482
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html.ini
new file mode 100644
index 00000000000..e622d8897fd
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html.ini
new file mode 100644
index 00000000000..abb023f741e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html.ini
new file mode 100644
index 00000000000..cb39cecb685
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html.ini
@@ -0,0 +1,2 @@
+[row-explicit-placement-008.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html.ini
new file mode 100644
index 00000000000..3cbb8c88f57
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html.ini
@@ -0,0 +1,2 @@
+[column-intrinsic-inline-container-size.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html.ini
new file mode 100644
index 00000000000..7a61921bb87
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html.ini
@@ -0,0 +1,2 @@
+[masonry-intrinsic-sizing-cols-001-fr.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html.ini
new file mode 100644
index 00000000000..d2a149b2618
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html.ini
@@ -0,0 +1,2 @@
+[masonry-intrinsic-sizing-cols-004-fr.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html.ini
new file mode 100644
index 00000000000..9634d5f9487
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html.ini
@@ -0,0 +1,2 @@
+[masonry-intrinsic-sizing-cols-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html.ini
new file mode 100644
index 00000000000..c5181972ed8
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html.ini
@@ -0,0 +1,2 @@
+[row-defined-height.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html.ini
new file mode 100644
index 00000000000..7ff0cc4ea9a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html.ini
new file mode 100644
index 00000000000..a59c42cd98b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html.ini
new file mode 100644
index 00000000000..e89101b391b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html.ini
new file mode 100644
index 00000000000..7452590102e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html.ini
new file mode 100644
index 00000000000..23c604b354f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html.ini
new file mode 100644
index 00000000000..3dc147b2f8e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html.ini
new file mode 100644
index 00000000000..65915255568
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html.ini
new file mode 100644
index 00000000000..77499330cf1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html.ini
new file mode 100644
index 00000000000..54776c67e0c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html.ini
new file mode 100644
index 00000000000..5c0b9217d3e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html.ini
new file mode 100644
index 00000000000..a9f5f3adfa9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html.ini
new file mode 100644
index 00000000000..d4f70d55cf0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html.ini
new file mode 100644
index 00000000000..acf24a04966
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html.ini
new file mode 100644
index 00000000000..6e020b066c3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html.ini
@@ -0,0 +1,2 @@
+[column-dense-packing-multi-span-008.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html.ini
new file mode 100644
index 00000000000..a8a08bff78f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html.ini
new file mode 100644
index 00000000000..32a44a46488
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html.ini
new file mode 100644
index 00000000000..477cf2bc205
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html.ini
new file mode 100644
index 00000000000..97699d7f92c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html.ini
new file mode 100644
index 00000000000..ce7daf45c6a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-multi-span-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html.ini
new file mode 100644
index 00000000000..a865e62c8c5
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-multi-span-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html.ini
new file mode 100644
index 00000000000..fc0836cb96f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-multi-span-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html.ini
new file mode 100644
index 00000000000..d973363e5a6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html.ini
@@ -0,0 +1,2 @@
+[row-dense-packing-multi-span-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html.ini
new file mode 100644
index 00000000000..901faa3ee35
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html.ini
@@ -0,0 +1,2 @@
+[column-initial-item-tolerance.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html.ini
new file mode 100644
index 00000000000..fc7643625e1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html.ini
@@ -0,0 +1,2 @@
+[column-item-tolerance-infinite.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html.ini
new file mode 100644
index 00000000000..2fc0968d534
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html.ini
@@ -0,0 +1,2 @@
+[row-initial-item-tolerance.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html.ini
new file mode 100644
index 00000000000..690f268daf7
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html.ini
@@ -0,0 +1,2 @@
+[row-item-tolerance-infinite.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html.ini
new file mode 100644
index 00000000000..700bf5e9d9a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html.ini
@@ -0,0 +1,2 @@
+[masonry-item-placement-008.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html.ini
new file mode 100644
index 00000000000..f83c365007b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html.ini
@@ -0,0 +1,2 @@
+[masonry-rows-with-grid-width-changed.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html.ini
new file mode 100644
index 00000000000..60ab6dc1441
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html.ini
new file mode 100644
index 00000000000..f5f5871a3e7
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-placement-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html.ini
new file mode 100644
index 00000000000..eddb6e23398
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html.ini
@@ -0,0 +1,2 @@
+[row-auto-placement-max-content.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html.ini
new file mode 100644
index 00000000000..39a2269f1e4
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html.ini
@@ -0,0 +1,2 @@
+[row-auto-placement-min-content.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html.ini
index 4b55ec0d536..93bf35e481d 100644
--- a/tests/wpt/meta/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html.ini
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html.ini
@@ -32,5 +32,44 @@
   [Property grid-template-columns value '[one\] repeat(2, minmax(50px, auto)) [two\] 30px [three\] repeat(auto-fill, 10px) 40px [four five\] repeat(2, minmax(200px, auto)) [six\]']
     expected: FAIL
 
-  [Property grid-template-columns value 'none']
+  [Property grid-template-columns value '20%']
+    expected: FAIL
+
+  [Property grid-template-columns value '5fr']
+    expected: FAIL
+
+  [Property grid-template-columns value 'min-content']
+    expected: FAIL
+
+  [Property grid-template-columns value 'max-content']
+    expected: FAIL
+
+  [Property grid-template-columns value 'auto']
+    expected: FAIL
+
+  [Property grid-template-columns value 'minmax(10px, auto)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'minmax(20%, max-content)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'fit-content(70px)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'fit-content(20%)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'fit-content(calc(-0.5em + 10px))']
+    expected: FAIL
+
+  [Property grid-template-columns value 'repeat(1, 10px)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'min-content repeat(5, minmax(10px, auto))']
+    expected: FAIL
+
+  [Property grid-template-columns value '[\] 150px [\] 1fr [\]']
+    expected: FAIL
+
+  [Property grid-template-columns value 'repeat(auto-fill, 200px)']
     expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html.ini
new file mode 100644
index 00000000000..aac5cf189cd
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html.ini
@@ -0,0 +1,2 @@
+[column-order-property-auto-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html.ini
new file mode 100644
index 00000000000..98887cdb44d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html.ini
@@ -0,0 +1,2 @@
+[column-order-property-auto-placement-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html.ini
new file mode 100644
index 00000000000..483dfab45a8
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html.ini
@@ -0,0 +1,2 @@
+[column-order-property-auto-placement-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html.ini
new file mode 100644
index 00000000000..c32798c0f1e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html.ini
@@ -0,0 +1,2 @@
+[column-order-property-auto-placement-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html.ini
new file mode 100644
index 00000000000..177ffc3439c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html.ini
@@ -0,0 +1,2 @@
+[column-order-property-auto-placement-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html.ini
new file mode 100644
index 00000000000..64cab807b8b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html.ini
@@ -0,0 +1,2 @@
+[row-order-property-auto-placement-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html.ini
new file mode 100644
index 00000000000..89fdbbd45b5
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html.ini
@@ -0,0 +1,2 @@
+[row-order-property-auto-placement-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html.ini
new file mode 100644
index 00000000000..5e99da1ee83
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html.ini
@@ -0,0 +1,2 @@
+[row-order-property-auto-placement-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html.ini
new file mode 100644
index 00000000000..a635f98f241
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html.ini
@@ -0,0 +1,2 @@
+[row-order-property-auto-placement-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html.ini
new file mode 100644
index 00000000000..446cdd662fa
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html.ini
@@ -0,0 +1,2 @@
+[row-order-property-auto-placement-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/parsing/masonry-parsing.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/parsing/masonry-parsing.html.ini
deleted file mode 100644
index 752ff7a66da..00000000000
--- a/tests/wpt/meta/css/css-grid/masonry/tentative/parsing/masonry-parsing.html.ini
+++ /dev/null
@@ -1,120 +0,0 @@
-[masonry-parsing.html]
-  [e.style['grid-template-columns'\] = "masonry" should set the property value]
-    expected: FAIL
-
-  [e.style['grid-template-rows'\] = "masonry" should set the property value]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / masonry" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / masonry" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / masonry" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / masonry" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / subgrid [foo\]" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / subgrid [foo\]" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / subgrid [foo\]" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "masonry / subgrid [foo\]" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "10px / masonry" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "10px / masonry" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "10px / masonry" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid-template'\] = "10px / masonry" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-auto-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-auto-flow]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-auto-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / masonry" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-auto-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-auto-flow]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-auto-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "masonry / subgrid [foo\]" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-auto-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-auto-flow]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-auto-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-template-areas]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-template-columns]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should set grid-template-rows]
-    expected: FAIL
-
-  [e.style['grid'\] = "10px / masonry" should not set unrelated longhands]
-    expected: FAIL
-
-  [e.style['masonry-auto-flow'\] = "pack" should set the property value]
-    expected: FAIL
-
-  [e.style['masonry-auto-flow'\] = "pack ordered" should set the property value]
-    expected: FAIL
-
-  [e.style['masonry-auto-flow'\] = "ordered next" should set the property value]
-    expected: FAIL
-
-  [e.style['masonry-auto-flow'\] = "next definite-first" should set the property value]
-    expected: FAIL
-
-  [e.style['masonry-auto-flow'\] = "definite-first pack" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/row-min-max-content-container.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/row-min-max-content-container.html.ini
new file mode 100644
index 00000000000..70aa5eb3e45
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/row-min-max-content-container.html.ini
@@ -0,0 +1,2 @@
+[row-min-max-content-container.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html.ini
new file mode 100644
index 00000000000..32706178e96
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html.ini
new file mode 100644
index 00000000000..67993e3f032
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html.ini
new file mode 100644
index 00000000000..59c8c644318
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html.ini
new file mode 100644
index 00000000000..99b6782f8a9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html.ini
new file mode 100644
index 00000000000..14cd6768197
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html.ini
new file mode 100644
index 00000000000..39667686c54
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html.ini
new file mode 100644
index 00000000000..98d8bc944b6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html.ini
@@ -0,0 +1,36 @@
+[column-auto-repeat-008.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
+
+  [.masonry 5]
+    expected: FAIL
+
+  [.masonry 6]
+    expected: FAIL
+
+  [.masonry 7]
+    expected: FAIL
+
+  [.masonry 8]
+    expected: FAIL
+
+  [.masonry 9]
+    expected: FAIL
+
+  [.masonry 10]
+    expected: FAIL
+
+  [.masonry 11]
+    expected: FAIL
+
+  [.masonry 12]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html.ini
new file mode 100644
index 00000000000..954a99684eb
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html.ini
@@ -0,0 +1,9 @@
+[column-auto-repeat-009.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html.ini
new file mode 100644
index 00000000000..7db2cbe046f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-010.html]
+  [.masonry 1]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html.ini
new file mode 100644
index 00000000000..ed93bd97787
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html.ini
@@ -0,0 +1,12 @@
+[column-auto-repeat-011.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html.ini
new file mode 100644
index 00000000000..55a9c38cbe1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html.ini
@@ -0,0 +1,12 @@
+[column-auto-repeat-012.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html.ini
new file mode 100644
index 00000000000..f40d4581aae
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-013.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html.ini
new file mode 100644
index 00000000000..d9e6475bfd0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-014.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html.ini
new file mode 100644
index 00000000000..23aad91c410
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-015.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html.ini
new file mode 100644
index 00000000000..bb10c39fd42
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-016.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html.ini
new file mode 100644
index 00000000000..dee42d63da3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-017.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html.ini
new file mode 100644
index 00000000000..7957d490020
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-018.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html.ini
new file mode 100644
index 00000000000..ec79c6f6164
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-019.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html.ini
new file mode 100644
index 00000000000..d1bb57a8113
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-020.html]
+  [Auto-fit repeat tracks with fixed size and auto/explicit item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html.ini
new file mode 100644
index 00000000000..bf475e71b08
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-021.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html.ini
new file mode 100644
index 00000000000..5c50cc59d0f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-022.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html.ini
new file mode 100644
index 00000000000..ed2bd70328d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-023.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html.ini
new file mode 100644
index 00000000000..cdaf7e999bd
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-024.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html.ini
new file mode 100644
index 00000000000..10039cfbac1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-025.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html.ini
new file mode 100644
index 00000000000..75dcee9d9a3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-026.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html.ini
new file mode 100644
index 00000000000..145568cffb5
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html.ini
new file mode 100644
index 00000000000..de7c6e1e1ff
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html.ini
new file mode 100644
index 00000000000..aaa606b55ae
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html.ini
new file mode 100644
index 00000000000..7e3078e410c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html.ini
new file mode 100644
index 00000000000..8d98eb44f77
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html.ini
new file mode 100644
index 00000000000..10b49ac0e69
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html.ini
new file mode 100644
index 00000000000..d6739a52d3f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-007.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html.ini
new file mode 100644
index 00000000000..5b19ee7d355
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html.ini
@@ -0,0 +1,24 @@
+[column-auto-repeat-auto-009.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
+
+  [.masonry 5]
+    expected: FAIL
+
+  [.masonry 6]
+    expected: FAIL
+
+  [.masonry 7]
+    expected: FAIL
+
+  [.masonry 8]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html.ini
new file mode 100644
index 00000000000..a80f68cc87f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html.ini
@@ -0,0 +1,12 @@
+[column-auto-repeat-auto-010.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html.ini
new file mode 100644
index 00000000000..b104b52b278
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-011.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html.ini
new file mode 100644
index 00000000000..f994b5d86b0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-012.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html.ini
new file mode 100644
index 00000000000..e6f32dfaf88
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-013.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html.ini
new file mode 100644
index 00000000000..fe88938cf6b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-014.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html.ini
new file mode 100644
index 00000000000..ff673e1d805
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-015.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html.ini
new file mode 100644
index 00000000000..e8224e04beb
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-016.html]
+  [Auto-fit repeat tracks with auto size and auto/explicit item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html.ini
new file mode 100644
index 00000000000..b31f3fce846
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-019.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html.ini
new file mode 100644
index 00000000000..2522e418c9b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-020.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html.ini
new file mode 100644
index 00000000000..daf7feae29d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-021.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html.ini
new file mode 100644
index 00000000000..b1bf2ac75c4
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-022.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html.ini
new file mode 100644
index 00000000000..e452d1344d6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-023.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html.ini
new file mode 100644
index 00000000000..817b00b52ab
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-024.html]
+  [Auto repeat tracks with fixed size and replaced items]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html.ini
new file mode 100644
index 00000000000..5629efc5378
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-025.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html.ini
new file mode 100644
index 00000000000..cf112ffdc3d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html.ini
@@ -0,0 +1,3 @@
+[column-auto-repeat-auto-027.html]
+  [Auto repeat tracks with fixed size and replaced items]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html.ini
new file mode 100644
index 00000000000..5cb08cf0625
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-auto-029.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html.ini
new file mode 100644
index 00000000000..3bee25b7ca2
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-fit-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html.ini
new file mode 100644
index 00000000000..ff4db78d446
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-fit-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html.ini
new file mode 100644
index 00000000000..81d7d702199
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-fit-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html.ini
new file mode 100644
index 00000000000..76cde00732d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-fit-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html.ini
new file mode 100644
index 00000000000..43850e9fb56
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-fit-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html.ini
new file mode 100644
index 00000000000..986ca8ce9d8
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-max-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html.ini
new file mode 100644
index 00000000000..c3f4139fbd4
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-max-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html.ini
new file mode 100644
index 00000000000..02c69918344
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-max-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html.ini
new file mode 100644
index 00000000000..502267855bc
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-max-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html.ini
new file mode 100644
index 00000000000..fec05f0095a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-min-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html.ini
new file mode 100644
index 00000000000..fabfc397c0a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-min-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html.ini
new file mode 100644
index 00000000000..7f2a40fc8de
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-min-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html.ini
new file mode 100644
index 00000000000..760ba8f2550
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-min-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html.ini
new file mode 100644
index 00000000000..33e580dd311
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-min-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html.ini
new file mode 100644
index 00000000000..7db4b8a8119
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-mixed-intrinsic-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html.ini
new file mode 100644
index 00000000000..2a644b83a34
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-mixed-intrinsic-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html.ini
new file mode 100644
index 00000000000..783d5d99998
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-mixed-intrinsic-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html.ini
new file mode 100644
index 00000000000..500d5da2e1c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html.ini
@@ -0,0 +1,2 @@
+[column-auto-repeat-mixed-intrinsic-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html.ini
new file mode 100644
index 00000000000..3ac136b255f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html.ini
new file mode 100644
index 00000000000..1badf59cab5
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html.ini
new file mode 100644
index 00000000000..240e8ee1ed9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html.ini
new file mode 100644
index 00000000000..87b7abb0c61
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html.ini
new file mode 100644
index 00000000000..dca4067566d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html.ini
new file mode 100644
index 00000000000..9b0ceb14988
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html.ini
new file mode 100644
index 00000000000..8f3102408d9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-008.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html.ini
new file mode 100644
index 00000000000..c66c5e9d185
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html.ini
@@ -0,0 +1,24 @@
+[row-auto-repeat-auto-009.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
+
+  [.masonry 5]
+    expected: FAIL
+
+  [.masonry 6]
+    expected: FAIL
+
+  [.masonry 7]
+    expected: FAIL
+
+  [.masonry 8]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html.ini
new file mode 100644
index 00000000000..d1599b3b857
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html.ini
@@ -0,0 +1,12 @@
+[row-auto-repeat-auto-010.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html.ini
new file mode 100644
index 00000000000..d94f7398c04
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-011.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html.ini
new file mode 100644
index 00000000000..58ecd93c4e1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-012.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html.ini
new file mode 100644
index 00000000000..3223d19306d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-013.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html.ini
new file mode 100644
index 00000000000..de44334c0d1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-014.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html.ini
new file mode 100644
index 00000000000..8dce1b92654
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-auto-015.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html.ini
new file mode 100644
index 00000000000..5ad58f25c29
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-auto-016.html]
+  [Auto-fit repeat tracks with auto size and auto/explicit item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html.ini
new file mode 100644
index 00000000000..b1edd91469c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-019.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html.ini
new file mode 100644
index 00000000000..986f99cc1e0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-auto-020.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html.ini
new file mode 100644
index 00000000000..0b5aee3263b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-auto-021.html]
+  [Auto-fit repeat tracks with auto size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html.ini
new file mode 100644
index 00000000000..b50408fa5be
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-022.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html.ini
new file mode 100644
index 00000000000..4b9ba839202
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-auto-025.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html.ini
new file mode 100644
index 00000000000..0dff0074ab6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-fit-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html.ini
new file mode 100644
index 00000000000..0490188bf61
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-fit-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html.ini
new file mode 100644
index 00000000000..5688ab0fa73
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-fit-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html.ini
new file mode 100644
index 00000000000..329d0e8b8d1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-fit-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html.ini
new file mode 100644
index 00000000000..2092f343a69
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-fit-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html.ini
new file mode 100644
index 00000000000..72821cd879e
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-max-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html.ini
new file mode 100644
index 00000000000..cb7c0079ac7
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-max-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html.ini
new file mode 100644
index 00000000000..2e7664f4fb0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-max-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html.ini
new file mode 100644
index 00000000000..18ac4e2b114
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-max-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html.ini
new file mode 100644
index 00000000000..d523a7e7b49
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-max-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html.ini
new file mode 100644
index 00000000000..312be57e0a9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-min-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html.ini
new file mode 100644
index 00000000000..d2bdfb6ec73
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-min-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html.ini
new file mode 100644
index 00000000000..09cf2d7a3a5
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-min-content-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html.ini
new file mode 100644
index 00000000000..a42c141cab9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-min-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html.ini
new file mode 100644
index 00000000000..9d61f089191
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-min-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html.ini
new file mode 100644
index 00000000000..a8b25b5eb61
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-mixed-intrinsic-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html.ini
new file mode 100644
index 00000000000..cb69d2b159d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-mixed-intrinsic-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html.ini
new file mode 100644
index 00000000000..1b00ecbd1be
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html.ini
new file mode 100644
index 00000000000..6a4b81a79cc
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html.ini
new file mode 100644
index 00000000000..c18988d386c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html.ini
new file mode 100644
index 00000000000..7b6d01a48e9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html.ini
new file mode 100644
index 00000000000..d56bb2ed43b
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html.ini
new file mode 100644
index 00000000000..79621db0ee3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html.ini
@@ -0,0 +1,36 @@
+[row-auto-repeat-007.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
+
+  [.masonry 5]
+    expected: FAIL
+
+  [.masonry 6]
+    expected: FAIL
+
+  [.masonry 7]
+    expected: FAIL
+
+  [.masonry 8]
+    expected: FAIL
+
+  [.masonry 9]
+    expected: FAIL
+
+  [.masonry 10]
+    expected: FAIL
+
+  [.masonry 11]
+    expected: FAIL
+
+  [.masonry 12]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html.ini
new file mode 100644
index 00000000000..4e0c15c39af
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html.ini
@@ -0,0 +1,12 @@
+[row-auto-repeat-008.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html.ini
new file mode 100644
index 00000000000..40db7242c5f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-009.html]
+  [.masonry 1]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html.ini
new file mode 100644
index 00000000000..c6b0b4045c2
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html.ini
@@ -0,0 +1,12 @@
+[row-auto-repeat-010.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html.ini
new file mode 100644
index 00000000000..65fc79067a7
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html.ini
@@ -0,0 +1,12 @@
+[row-auto-repeat-011.html]
+  [.masonry 1]
+    expected: FAIL
+
+  [.masonry 2]
+    expected: FAIL
+
+  [.masonry 3]
+    expected: FAIL
+
+  [.masonry 4]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html.ini
new file mode 100644
index 00000000000..72f3e5df8b1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-012.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html.ini
new file mode 100644
index 00000000000..48ecbc4f41a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-013.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html.ini
new file mode 100644
index 00000000000..758da353a06
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-014.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html.ini
new file mode 100644
index 00000000000..cbdc83b1038
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-015.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html.ini
new file mode 100644
index 00000000000..cf02a06a945
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-016.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html.ini
new file mode 100644
index 00000000000..5fb96a1c094
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-017.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html.ini
new file mode 100644
index 00000000000..3214ea890dd
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-018.html]
+  [Auto-fit repeat tracks with fixed size and auto/explicit item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html.ini
new file mode 100644
index 00000000000..73ccb82d933
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-019.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html.ini
new file mode 100644
index 00000000000..0c5a32ea40a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-020.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html.ini
new file mode 100644
index 00000000000..05e7ff2bec4
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-021.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html.ini
new file mode 100644
index 00000000000..38668c6734f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-022.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html.ini
new file mode 100644
index 00000000000..286d39126d8
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html.ini
@@ -0,0 +1,3 @@
+[row-auto-repeat-023.html]
+  [Auto-fit repeat tracks with fixed size and auto item placement]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html.ini
new file mode 100644
index 00000000000..752d70449b6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html.ini
@@ -0,0 +1,2 @@
+[row-auto-repeat-024.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html.ini
new file mode 100644
index 00000000000..d241e3a9a70
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html.ini
@@ -0,0 +1,2 @@
+[column-track-sizing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html.ini
new file mode 100644
index 00000000000..0d5044f5c49
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html.ini
@@ -0,0 +1,2 @@
+[column-track-sizing-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html.ini
new file mode 100644
index 00000000000..8e94efc882f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html.ini
@@ -0,0 +1,2 @@
+[column-track-sizing-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html.ini
new file mode 100644
index 00000000000..306a4e7d8a0
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html.ini
@@ -0,0 +1,2 @@
+[column-track-sizing-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html.ini
new file mode 100644
index 00000000000..6edaa1a5a9c
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html.ini
@@ -0,0 +1,2 @@
+[column-track-sizing-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html.ini
new file mode 100644
index 00000000000..e4d4b8224da
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html.ini
@@ -0,0 +1,2 @@
+[masonry-track-sizing-check-grid-height-on-resize.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html.ini
new file mode 100644
index 00000000000..2568b07fc1f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html.ini
@@ -0,0 +1,2 @@
+[masonry-track-sizing-explicit-block.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html.ini
new file mode 100644
index 00000000000..36fdc529595
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html.ini
@@ -0,0 +1,2 @@
+[masonry-track-sizing-overflow-left-side.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html.ini
new file mode 100644
index 00000000000..7375f961f22
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html.ini
@@ -0,0 +1,2 @@
+[masonry-track-sizing-overflow-right-side.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html.ini
new file mode 100644
index 00000000000..6858d23ff7d
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html.ini
@@ -0,0 +1,2 @@
+[masonry-track-sizing-span-row.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html.ini
new file mode 100644
index 00000000000..3b50ca569b6
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html.ini
@@ -0,0 +1,2 @@
+[row-track-sizing-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html.ini
new file mode 100644
index 00000000000..f953e2d62e3
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html.ini
@@ -0,0 +1,2 @@
+[row-track-sizing-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html.ini
new file mode 100644
index 00000000000..0d3c5445159
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html.ini
@@ -0,0 +1,2 @@
+[row-track-sizing-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html.ini
new file mode 100644
index 00000000000..d9f4aa48dc1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html.ini
@@ -0,0 +1,2 @@
+[row-track-sizing-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html.ini
new file mode 100644
index 00000000000..eacb67f7c9f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html.ini
@@ -0,0 +1,2 @@
+[row-track-sizing-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-lists/deep-pseudo-element-remove-update.html.ini b/tests/wpt/meta/css/css-lists/deep-pseudo-element-remove-update.html.ini
new file mode 100644
index 00000000000..820348c86f5
--- /dev/null
+++ b/tests/wpt/meta/css/css-lists/deep-pseudo-element-remove-update.html.ini
@@ -0,0 +1,2 @@
+[deep-pseudo-element-remove-update.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-nesting/nesting-basic.html.ini b/tests/wpt/meta/css/css-nesting/nesting-basic.html.ini
new file mode 100644
index 00000000000..96756469f0d
--- /dev/null
+++ b/tests/wpt/meta/css/css-nesting/nesting-basic.html.ini
@@ -0,0 +1,2 @@
+[nesting-basic.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-039.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-039.html.ini
new file mode 100644
index 00000000000..f77f871d944
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-039.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-auto-039.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-040.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-040.html.ini
new file mode 100644
index 00000000000..f6c2ad9458e
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-040.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-auto-040.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html.ini
new file mode 100644
index 00000000000..01c250f4869
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-with-abspos-017.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html.ini
deleted file mode 100644
index 39d8ecfca89..00000000000
--- a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[line-clamp-with-abspos-017.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html.ini
new file mode 100644
index 00000000000..0d51325483c
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-with-abspos-023.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.html.ini
new file mode 100644
index 00000000000..f9aa8febf88
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.html.ini
@@ -0,0 +1,2 @@
+[webkit-line-clamp-with-line-height.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.tentative.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.tentative.html.ini
deleted file mode 100644
index aacd5624a5d..00000000000
--- a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[webkit-line-clamp-with-line-height.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.html.ini
new file mode 100644
index 00000000000..e5cc3903833
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.html.ini
@@ -0,0 +1,2 @@
+[webkit-line-clamp-with-max-height.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.tentative.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.tentative.html.ini
deleted file mode 100644
index 37ff0a5a4f8..00000000000
--- a/tests/wpt/meta/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[webkit-line-clamp-with-max-height.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-transitions/render-blocking/no-transition-from-ua-to-blocking-stylesheet.html.ini b/tests/wpt/meta/css/css-transitions/render-blocking/no-transition-from-ua-to-blocking-stylesheet.html.ini
deleted file mode 100644
index 70a00a101f6..00000000000
--- a/tests/wpt/meta/css/css-transitions/render-blocking/no-transition-from-ua-to-blocking-stylesheet.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[no-transition-from-ua-to-blocking-stylesheet.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/caret-eol-001.html.ini b/tests/wpt/meta/css/css-ui/caret-eol-001.html.ini
new file mode 100644
index 00000000000..9787f315472
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/caret-eol-001.html.ini
@@ -0,0 +1,2 @@
+[caret-eol-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/caret-eol-002.html.ini b/tests/wpt/meta/css/css-ui/caret-eol-002.html.ini
new file mode 100644
index 00000000000..709ad496d0a
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/caret-eol-002.html.ini
@@ -0,0 +1,2 @@
+[caret-eol-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/cursor-computed.html.ini b/tests/wpt/meta/css/css-ui/parsing/cursor-computed.html.ini
new file mode 100644
index 00000000000..c124f28dac6
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/parsing/cursor-computed.html.ini
@@ -0,0 +1,9 @@
+[cursor-computed.html]
+  [Property cursor value 'linear-gradient(200grad, red 10%, blue calc(75% - 2px)), auto']
+    expected: FAIL
+
+  [Property cursor value 'radial-gradient(farthest-side at calc(5px + 10%), red, blue), pointer']
+    expected: FAIL
+
+  [Property cursor value 'conic-gradient(from 3.1416rad at 20% 20%, red, blue), crosshair']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/attr-all-types.html.ini b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
index 73d666fce7c..cf538e24214 100644
--- a/tests/wpt/meta/css/css-values/attr-all-types.html.ini
+++ b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
@@ -23,12 +23,6 @@
   [CSS Values and Units Test: attr 11]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 18]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 21]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 24]
     expected: FAIL
 
@@ -62,12 +56,6 @@
   [CSS Values and Units Test: attr 45]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 48]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 50]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 51]
     expected: FAIL
 
@@ -107,9 +95,6 @@
   [CSS Values and Units Test: attr 68]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 69]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 70]
     expected: FAIL
 
@@ -164,12 +149,6 @@
   [CSS Values and Units Test: attr 83]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 35]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 38]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 54]
     expected: FAIL
 
@@ -197,9 +176,6 @@
   [CSS Values and Units Test: attr 10]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 14]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 15]
     expected: FAIL
 
@@ -248,14 +224,47 @@
   [CSS Values and Units Test: attr 96]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 105]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 106]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 107]
     expected: FAIL
 
   [CSS Values and Units Test: attr 108]
     expected: FAIL
+
+  [CSS Values and Units Test: attr 1]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 12]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 17]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 19]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 34]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 36]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 46]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 49]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 65]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 97]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 98]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 109]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 110]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/typed_arithmetic.html.ini b/tests/wpt/meta/css/css-values/typed_arithmetic.html.ini
index f1034ae5b4b..20cfd9b0a72 100644
--- a/tests/wpt/meta/css/css-values/typed_arithmetic.html.ini
+++ b/tests/wpt/meta/css/css-values/typed_arithmetic.html.ini
@@ -73,3 +73,27 @@
 
   [subtraction of angle unit: deg minus turn]
     expected: FAIL
+
+  [calc(10% / 1px) should be used-value-equivalent to 1]
+    expected: FAIL
+
+  [calc(1% * 100% / 10%) should be used-value-equivalent to 10%]
+    expected: FAIL
+
+  [calc(10% / 10%) should be used-value-equivalent to 1]
+    expected: FAIL
+
+  [calc((10% * 1%) / 1px) should be used-value-equivalent to 10px]
+    expected: FAIL
+
+  [calc(10% * 10% / 1px * 10deg / 1deg / 10px) should be used-value-equivalent to 1]
+    expected: FAIL
+
+  [calc(10% * 10% / 1px * 1deg / 1deg) should be used-value-equivalent to 1px]
+    expected: FAIL
+
+  [calc(1px * 2deg / 1deg) should be used-value-equivalent to 2px]
+    expected: FAIL
+
+  [calc(1px * 3deg / 1deg / 1px) should be used-value-equivalent to 3]
+    expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/registries/valid-custom-element-names.html.ini b/tests/wpt/meta/custom-elements/registries/valid-custom-element-names.html.ini
index 40204941807..01bb693e423 100644
--- a/tests/wpt/meta/custom-elements/registries/valid-custom-element-names.html.ini
+++ b/tests/wpt/meta/custom-elements/registries/valid-custom-element-names.html.ini
@@ -1,3 +1,333 @@
 [valid-custom-element-names.html]
   [valid-custom-element-names]
     expected: FAIL
+
+  [Valid custom element name: code points: [97,45,1\], string: "a-\x01"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,1,45,101,108,101,109,101,110,116\], string: "a\x01-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,2\], string: "a-\x02"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,2,45,101,108,101,109,101,110,116\], string: "a\x02-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,3\], string: "a-\x03"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,3,45,101,108,101,109,101,110,116\], string: "a\x03-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,4\], string: "a-\x04"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,4,45,101,108,101,109,101,110,116\], string: "a\x04-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,5\], string: "a-\x05"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,5,45,101,108,101,109,101,110,116\], string: "a\x05-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,6\], string: "a-\x06"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,6,45,101,108,101,109,101,110,116\], string: "a\x06-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,7\], string: "a-\x07"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,7,45,101,108,101,109,101,110,116\], string: "a\x07-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,8\], string: "a-\x08"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,8,45,101,108,101,109,101,110,116\], string: "a\x08-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,11\], string: "a-\x0b"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,11,45,101,108,101,109,101,110,116\], string: "a\x0b-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,14\], string: "a-\x0e"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,14,45,101,108,101,109,101,110,116\], string: "a\x0e-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,15\], string: "a-\x0f"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,15,45,101,108,101,109,101,110,116\], string: "a\x0f-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,16\], string: "a-\x10"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,16,45,101,108,101,109,101,110,116\], string: "a\x10-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,17\], string: "a-\x11"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,17,45,101,108,101,109,101,110,116\], string: "a\x11-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,18\], string: "a-\x12"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,18,45,101,108,101,109,101,110,116\], string: "a\x12-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,19\], string: "a-\x13"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,19,45,101,108,101,109,101,110,116\], string: "a\x13-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,20\], string: "a-\x14"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,20,45,101,108,101,109,101,110,116\], string: "a\x14-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,21\], string: "a-\x15"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,21,45,101,108,101,109,101,110,116\], string: "a\x15-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,22\], string: "a-\x16"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,22,45,101,108,101,109,101,110,116\], string: "a\x16-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,23\], string: "a-\x17"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,23,45,101,108,101,109,101,110,116\], string: "a\x17-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,24\], string: "a-\x18"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,24,45,101,108,101,109,101,110,116\], string: "a\x18-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,25\], string: "a-\x19"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,25,45,101,108,101,109,101,110,116\], string: "a\x19-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,26\], string: "a-\x1a"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,26,45,101,108,101,109,101,110,116\], string: "a\x1a-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,27\], string: "a-\x1b"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,27,45,101,108,101,109,101,110,116\], string: "a\x1b-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,28\], string: "a-\x1c"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,28,45,101,108,101,109,101,110,116\], string: "a\x1c-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,29\], string: "a-\x1d"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,29,45,101,108,101,109,101,110,116\], string: "a\x1d-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,30\], string: "a-\x1e"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,30,45,101,108,101,109,101,110,116\], string: "a\x1e-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,31\], string: "a-\x1f"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,31,45,101,108,101,109,101,110,116\], string: "a\x1f-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,33\], string: "a-!"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,33,45,101,108,101,109,101,110,116\], string: "a!-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,34\], string: "a-""]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,34,45,101,108,101,109,101,110,116\], string: "a"-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,35\], string: "a-#"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,35,45,101,108,101,109,101,110,116\], string: "a#-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,36\], string: "a-$"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,36,45,101,108,101,109,101,110,116\], string: "a$-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,37\], string: "a-%"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,37,45,101,108,101,109,101,110,116\], string: "a%-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,38\], string: "a-&"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,38,45,101,108,101,109,101,110,116\], string: "a&-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,39\], string: "a-'"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,39,45,101,108,101,109,101,110,116\], string: "a'-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,40\], string: "a-("]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,40,45,101,108,101,109,101,110,116\], string: "a(-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,41\], string: "a-)"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,41,45,101,108,101,109,101,110,116\], string: "a)-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,42\], string: "a-*"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,42,45,101,108,101,109,101,110,116\], string: "a*-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,43\], string: "a-+"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,43,45,101,108,101,109,101,110,116\], string: "a+-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,44\], string: "a-,"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,44,45,101,108,101,109,101,110,116\], string: "a,-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,58\], string: "a-:"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,58,45,101,108,101,109,101,110,116\], string: "a:-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,59\], string: "a-;"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,59,45,101,108,101,109,101,110,116\], string: "a;-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,60\], string: "a-<"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,60,45,101,108,101,109,101,110,116\], string: "a<-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,61\], string: "a-="]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,61,45,101,108,101,109,101,110,116\], string: "a=-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,63\], string: "a-?"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,63,45,101,108,101,109,101,110,116\], string: "a?-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,64\], string: "a-@"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,64,45,101,108,101,109,101,110,116\], string: "a@-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,91\], string: "a-["]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,91,45,101,108,101,109,101,110,116\], string: "a[-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,92\], string: "a-\\"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,92,45,101,108,101,109,101,110,116\], string: "a\\-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,93\], string: "a-\]"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,93,45,101,108,101,109,101,110,116\], string: "a\]-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,94\], string: "a-^"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,94,45,101,108,101,109,101,110,116\], string: "a^-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,96\], string: "a-`"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,96,45,101,108,101,109,101,110,116\], string: "a`-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,123\], string: "a-{"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,123,45,101,108,101,109,101,110,116\], string: "a{-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,124\], string: "a-|"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,124,45,101,108,101,109,101,110,116\], string: "a|-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,125\], string: "a-}"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,125,45,101,108,101,109,101,110,116\], string: "a}-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,126\], string: "a-~"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,126,45,101,108,101,109,101,110,116\], string: "a~-element"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,45,127\], string: "a-"]
+    expected: FAIL
+
+  [Valid custom element name: code points: [97,127,45,101,108,101,109,101,110,116\], string: "a-element"]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/max-payload.https.window.js.ini b/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/max-payload.https.window.js.ini
index 33280beb2d5..e0796d664f8 100644
--- a/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/max-payload.https.window.js.ini
+++ b/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/max-payload.https.window.js.ini
@@ -1,4 +1,5 @@
 [max-payload.https.window.html]
+  expected: TIMEOUT
   [fetchLater() accepts max payload in a POST request body of String in same-origin iframe.]
     expected: FAIL
 
diff --git a/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.js.ini b/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.js.ini
index 5b64c7dbb05..7676bf8db7d 100644
--- a/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.js.ini
+++ b/tests/wpt/meta/fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.js.ini
@@ -1,3 +1,4 @@
 [multiple-iframes.https.window.html]
+  expected: ERROR
   [fetchLater() request quota are shared by same-origin iframes and root.]
     expected: FAIL
diff --git a/tests/wpt/meta/fetch/metadata/generated/css-font-face.https.sub.tentative.html.ini b/tests/wpt/meta/fetch/metadata/generated/css-font-face.https.sub.tentative.html.ini
index ce0aed48067..28de2b1ec6d 100644
--- a/tests/wpt/meta/fetch/metadata/generated/css-font-face.https.sub.tentative.html.ini
+++ b/tests/wpt/meta/fetch/metadata/generated/css-font-face.https.sub.tentative.html.ini
@@ -52,6 +52,3 @@
 
   [sec-fetch-user]
     expected: FAIL
-
-  [sec-fetch-dest]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
index d5f4fa2f799..2241163d563 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
@@ -4,3 +4,6 @@
 
   [form submission]
     expected: FAIL
+
+  [link click]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
deleted file mode 100644
index 4ecd6d9f753..00000000000
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[navigation-unload-cross-origin.sub.window.html]
-  [Cross-origin navigation started from unload handler must be ignored]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
new file mode 100644
index 00000000000..7dc346632a4
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
@@ -0,0 +1,3 @@
+[navigation-unload-same-origin.window.html]
+  [Same-origin navigation started from unload handler must be ignored]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/idlharness.https.html.ini b/tests/wpt/meta/html/dom/idlharness.https.html.ini
index 32a83999bcc..6c023511f20 100644
--- a/tests/wpt/meta/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/meta/html/dom/idlharness.https.html.ini
@@ -7104,3 +7104,15 @@
 
   [HTMLSelectedContentElement interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
+
+  [HTMLElement interface: attribute headingOffset]
+    expected: FAIL
+
+  [HTMLElement interface: attribute headingReset]
+    expected: FAIL
+
+  [HTMLElement interface: document.createElement("noscript") must inherit property "headingOffset" with the proper type]
+    expected: FAIL
+
+  [HTMLElement interface: document.createElement("noscript") must inherit property "headingReset" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 798d96edc20..b680c14d61c 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -7,10 +7,13 @@
     expected: NOTRUN
 
   [Element with tabindex should support autofocus]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Area element should support autofocus]
     expected: NOTRUN
 
   [Host element with delegatesFocus should support autofocus]
-    expected: FAIL
+    expected: NOTRUN
+
+  [Non-HTMLElement should not support autofocus]
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index bbc1f35d8d9..8822f4daba6 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_nonescaping-1.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 90c8bd71ded..4034793cc72 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index a24e565bbce..ff6467094b8 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini b/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
index e9ed11983ad..9499d75851a 100644
--- a/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
+++ b/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
@@ -181,6 +181,3 @@
 
   [application/x-www-form-urlencoded: 0x00 in name (formdata event)]
     expected: FAIL
-
-  [application/x-www-form-urlencoded: Basic test (normal form)]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/historical.html.ini b/tests/wpt/meta/html/semantics/forms/historical.html.ini
deleted file mode 100644
index 5d8289307cc..00000000000
--- a/tests/wpt/meta/html/semantics/forms/historical.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[historical.html]
-  [<input name=isindex> should not be supported]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/popovers/popover-alignment-001.html.ini b/tests/wpt/meta/html/semantics/popovers/popover-alignment-001.html.ini
new file mode 100644
index 00000000000..bbfaa8cffcc
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/popovers/popover-alignment-001.html.ini
@@ -0,0 +1,2 @@
+[popover-alignment-001.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/popovers/popover-alignment-002.html.ini b/tests/wpt/meta/html/semantics/popovers/popover-alignment-002.html.ini
new file mode 100644
index 00000000000..b6e7e3871bd
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/popovers/popover-alignment-002.html.ini
@@ -0,0 +1,2 @@
+[popover-alignment-002.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/popovers/popover-anchor-multicol-display.tentative.html.ini b/tests/wpt/meta/html/semantics/popovers/popover-anchor-multicol-display.tentative.html.ini
index b3552cc5e58..cdab0bdf45c 100644
--- a/tests/wpt/meta/html/semantics/popovers/popover-anchor-multicol-display.tentative.html.ini
+++ b/tests/wpt/meta/html/semantics/popovers/popover-anchor-multicol-display.tentative.html.ini
@@ -1,3 +1,6 @@
 [popover-anchor-multicol-display.tentative.html]
   [.target 1]
     expected: FAIL
+
+  [.target 2]
+    expected: FAIL
diff --git a/tests/wpt/meta/preload/preload-error.sub.html.ini b/tests/wpt/meta/preload/preload-error.sub.html.ini
index 205e9f38642..045013a98ac 100644
--- a/tests/wpt/meta/preload/preload-error.sub.html.ini
+++ b/tests/wpt/meta/preload/preload-error.sub.html.ini
@@ -49,3 +49,6 @@
 
   [MIME-blocked-nosniff (script): main]
     expected: FAIL
+
+  [success (fetch): main]
+    expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/nested-context-navigations-iframe.html.ini b/tests/wpt/meta/resource-timing/nested-context-navigations-iframe.html.ini
new file mode 100644
index 00000000000..b2e41dfde44
--- /dev/null
+++ b/tests/wpt/meta/resource-timing/nested-context-navigations-iframe.html.ini
@@ -0,0 +1,25 @@
+[nested-context-navigations-iframe.html]
+  expected: TIMEOUT
+  [Test that crossorigin iframe navigations are not observable by the parent, even after history navigations by the parent]
+    expected: TIMEOUT
+
+  [Test that cross-site iframe navigations are not observable by the parent, even after history navigations by the parent]
+    expected: NOTRUN
+
+  [Test that iframe navigations are not observable by the parent]
+    expected: NOTRUN
+
+  [Test that crossorigin iframe navigations are not observable by the parent]
+    expected: NOTRUN
+
+  [Test that cross-site iframe navigations are not observable by the parent]
+    expected: NOTRUN
+
+  [Test that iframe refreshes are not observable by the parent]
+    expected: NOTRUN
+
+  [Test that crossorigin iframe refreshes are not observable by the parent]
+    expected: NOTRUN
+
+  [Test that cross-site iframe refreshes are not observable by the parent]
+    expected: NOTRUN
diff --git a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
index 751fe66c9c7..bb7561cd24e 100644
--- a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
+++ b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
@@ -137,9 +137,6 @@
   [Navigate a window via area with javascript:-urls w/ a default policy making the URL invalid in report-only mode.]
     expected: FAIL
 
-  [Navigate a window via form-submission with javascript:-urls in enforcing mode.]
-    expected: FAIL
-
 
 [trusted-types-navigation.html?01-05]
   [Navigate a window via anchor with javascript:-urls in enforcing mode.]
diff --git a/tests/wpt/meta/wasm/jsapi/idlharness.any.js.ini b/tests/wpt/meta/wasm/jsapi/idlharness.any.js.ini
index 602a5512bfa..bd96c6ac022 100644
--- a/tests/wpt/meta/wasm/jsapi/idlharness.any.js.ini
+++ b/tests/wpt/meta/wasm/jsapi/idlharness.any.js.ini
@@ -14,6 +14,18 @@
   [Memory interface: [object WebAssembly.Memory\] must inherit property "toResizableBuffer()" with the proper type]
     expected: FAIL
 
+  [Table interface: operation set(AddressValue, optional any)]
+    expected: FAIL
+
+  [Exception interface object length]
+    expected: FAIL
+
+  [Exception interface: operation getArg(unsigned long)]
+    expected: FAIL
+
+  [Exception interface: attribute stack]
+    expected: FAIL
+
 
 [idlharness.any.worker.html]
   [Table interface: operation set(unsigned long, optional any)]
@@ -31,6 +43,18 @@
   [Memory interface: [object WebAssembly.Memory\] must inherit property "toResizableBuffer()" with the proper type]
     expected: FAIL
 
+  [Table interface: operation set(AddressValue, optional any)]
+    expected: FAIL
+
+  [Exception interface object length]
+    expected: FAIL
+
+  [Exception interface: operation getArg(unsigned long)]
+    expected: FAIL
+
+  [Exception interface: attribute stack]
+    expected: FAIL
+
 
 [idlharness.any.shadowrealm-in-window.html]
   expected: ERROR
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html.ini
index 3752df1dfb6..9232619e9df 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html.ini
@@ -4,3 +4,6 @@
 
   [Executing "AudioWorklet k-rate AudioParam"]
     expected: FAIL
+
+  [AudioWorklet k-rate AudioParam]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/nan-param.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/nan-param.html.ini
index 9eda3832142..5b8b96ed134 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/nan-param.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/nan-param.html.ini
@@ -8,3 +8,5 @@
   [# AUDIT TASK RUNNER FINISHED: 1 out of 1 tasks were failed.]
     expected: FAIL
 
+  [AudioParam NaN should be flushed to default value]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html.ini
index 82eef7e2c79..9a73c4314ae 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html.ini
@@ -1,3 +1,6 @@
 [retrospective-setTargetAtTime.html]
   [Executing "test"]
     expected: FAIL
+
+  [Test setTargetAtTime with start time in the past]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html.ini
index 590e7d25e09..4ecb9b21f1d 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html.ini
@@ -4,3 +4,6 @@
 
   [Executing "Verifying AudioParam in AudioWorkletNode"]
     expected: FAIL
+
+  [Verifying AudioParam in AudioWorkletNode]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html.ini
index 409892b92c2..936d79994fb 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html.ini
@@ -1,3 +1,6 @@
 [audioworkletnode-disconnected-input.https.html]
   [Executing "test"]
     expected: FAIL
+
+  [Input array length should be zero for disconnected input]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html.ini
index 289b1049eed..3fd13a904d2 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html.ini
@@ -4,3 +4,9 @@
 
   [Executing "test"]
     expected: FAIL
+
+  [AudioWorklet module should load successfully]
+    expected: FAIL
+
+  [ConvolverNode should stop active processing after source stops]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html.ini
index 55a0c4cab0d..2bff2db7f96 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html.ini
@@ -1,3 +1,6 @@
 [waveshaper-copy-curve.html]
   [Executing "test copying"]
     expected: FAIL
+
+  [test copying: Modifying curve should not modify WaveShaper]
+    expected: FAIL
diff --git a/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini b/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini
new file mode 100644
index 00000000000..3c21fb97f05
--- /dev/null
+++ b/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini
@@ -0,0 +1,3 @@
+[scroll_into_view.py]
+  [test_scroll_into_view]
+    expected: FAIL
diff --git a/tests/wpt/meta/workers/baseurl/alpha/sharedworker-in-worker.html.ini b/tests/wpt/meta/workers/baseurl/alpha/sharedworker-in-worker.html.ini
index 9b715377e1a..bbfb36bc188 100644
--- a/tests/wpt/meta/workers/baseurl/alpha/sharedworker-in-worker.html.ini
+++ b/tests/wpt/meta/workers/baseurl/alpha/sharedworker-in-worker.html.ini
@@ -1,3 +1,4 @@
 [sharedworker-in-worker.html]
+  expected: ERROR
   [Base URL in workers: new SharedWorker()]
     expected: FAIL
diff --git a/tests/wpt/tests/.github/workflows/update-wasm-tests.yml b/tests/wpt/tests/.github/workflows/update-wasm-tests.yml
index d1aafdcb124..5de4bab0a9a 100644
--- a/tests/wpt/tests/.github/workflows/update-wasm-tests.yml
+++ b/tests/wpt/tests/.github/workflows/update-wasm-tests.yml
@@ -30,10 +30,9 @@ jobs:
       - name: Convert WAST tests to WPT
         run: wasm-spec/test/build.py --dont-recompile --html wasm-spec/out/
       - name: Copy Wasm tests to WPT
-        # Replace wasm/core entirely.
+        # Replace wasm/core entirely, but preserve WEB_FEATURES.yml files.
         run: |
-          rm -rf wpt/wasm/core
-          cp -r wasm-spec/out/ wpt/wasm/core/
+          rsync -a --delete --exclude 'WEB_FEATURES.yml' wasm-spec/out/ wpt/wasm/core/
       - name: Commit changes
         id: commit
         continue-on-error: true
@@ -57,7 +56,7 @@ jobs:
         run: |
           cd wpt
           git push --set-upstream origin $BRANCH_NAME
-          gh pr create --title "$COMMIT_TITLE" --body "$PR_BODY" --reviewer past
+          gh pr create --title "$COMMIT_TITLE" --body "$PR_BODY" --reviewer jcscottiii,dschuff
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMMIT_TITLE: "Update Wasm tests"
diff --git a/tests/wpt/tests/.well-known/web-identity b/tests/wpt/tests/.well-known/web-identity
index 3369c96de28..8ba3c18b19e 100644
--- a/tests/wpt/tests/.well-known/web-identity
+++ b/tests/wpt/tests/.well-known/web-identity
@@ -2,13 +2,18 @@ import importlib
 keys = importlib.import_module("fedcm.support.keys")
 
 def main(request, response):
-  manifest_url = request.server.stash.take(keys.MANIFEST_URL_IN_MANIFEST_LIST_KEY)
+  namespace = "/.well-known/web-identity"
+
+  well_known_format = request.server.stash.take(keys.WELL_KNOWN_FORMAT_KEY, namespace)
+
+  port = request.server.config.ports["https"][0]
+  hostname = request.url_parts.hostname
+  base_url = "https://{0}:{1}".format(hostname, str(port))
+
+  manifest_url = request.server.stash.take(keys.MANIFEST_URL_IN_MANIFEST_LIST_KEY, namespace)
 
   if manifest_url is None or not len(manifest_url):
-    port = request.server.config.ports["https"][0]
-    hostname = request.url_parts.hostname
-    manifest_url = "https://{0}:{1}/fedcm/support/manifest.py".format(
-        hostname, str(port))
+    manifest_url = "{0}/fedcm/support/manifest.py".format(base_url)
   else:
     try:
       manifest_url = manifest_url.decode()
@@ -32,10 +37,54 @@ def main(request, response):
 
   response.headers.set(b"Content-Type", b"application/json")
 
+  # Handle different well-known formats
+  if well_known_format:
+    try:
+      format_type = well_known_format.decode()
+    except (UnicodeDecodeError, AttributeError):
+      format_type = str(well_known_format)
+
+    if format_type == "direct":
+      # Direct endpoints format with abs URLs
+      return """
+{{
+  "accounts_endpoint": "{0}/fedcm/support/accounts.py",
+  "login_url": "{0}/fedcm/support/login.html"
+}}
+""".format(base_url)
+    elif format_type == "empty":
+      # Empty endpoints (keep as empty strings)
+      return """
+{
+  "accounts_endpoint": "",
+  "login_url": ""
+}
+"""
+    elif format_type == "missing":
+      # Missing required endpoints
+      return """
+{
+}
+"""
+    elif format_type == "partial_accounts":
+      # Only accounts_endpoint with abs URL
+      return """
+{{
+  "accounts_endpoint": "{0}/fedcm/support/accounts.py"
+}}
+""".format(base_url)
+    elif format_type == "partial_login":
+      # Only login_url with abs URL
+      return """
+{{
+  "login_url": "{0}/fedcm/support/login.html"
+}}
+""".format(base_url)
+  # Default: provider_urls
   return """
 {{
   "provider_urls": [
     "{0}"
   ]
 }}
-""".format(manifest_url)
+""".format(manifest_url)
\ No newline at end of file
diff --git a/tests/wpt/tests/IndexedDB/idbindex_getAll-options.tentative.any.js b/tests/wpt/tests/IndexedDB/idbindex_getAll-options.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbindex_getAll-options.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbindex_getAll-options.any.js
diff --git a/tests/wpt/tests/IndexedDB/idbindex_getAllKeys-options.tentative.any.js b/tests/wpt/tests/IndexedDB/idbindex_getAllKeys-options.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbindex_getAllKeys-options.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbindex_getAllKeys-options.any.js
diff --git a/tests/wpt/tests/IndexedDB/idbindex_getAllRecords.tentative.any.js b/tests/wpt/tests/IndexedDB/idbindex_getAllRecords.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbindex_getAllRecords.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbindex_getAllRecords.any.js
diff --git a/tests/wpt/tests/IndexedDB/idbobjectstore_getAll-options.tentative.any.js b/tests/wpt/tests/IndexedDB/idbobjectstore_getAll-options.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbobjectstore_getAll-options.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbobjectstore_getAll-options.any.js
diff --git a/tests/wpt/tests/IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js b/tests/wpt/tests/IndexedDB/idbobjectstore_getAllKeys-options.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbobjectstore_getAllKeys-options.any.js
diff --git a/tests/wpt/tests/IndexedDB/idbobjectstore_getAllRecords.tentative.any.js b/tests/wpt/tests/IndexedDB/idbobjectstore_getAllRecords.any.js
similarity index 100%
rename from tests/wpt/tests/IndexedDB/idbobjectstore_getAllRecords.tentative.any.js
rename to tests/wpt/tests/IndexedDB/idbobjectstore_getAllRecords.any.js
diff --git a/tests/wpt/tests/close-watcher/META.yml b/tests/wpt/tests/close-watcher/META.yml
index 4534ab8abe2..f08fb7d1559 100644
--- a/tests/wpt/tests/close-watcher/META.yml
+++ b/tests/wpt/tests/close-watcher/META.yml
@@ -1,4 +1,3 @@
-spec: https://wicg.github.io/close-watcher/
+spec: https://html.spec.whatwg.org/multipage/#close-requests-and-close-watchers
 suggested_reviewers:
-  - domenic
   - natechapin
diff --git a/tests/wpt/tests/common/get-host-info.sub.js b/tests/wpt/tests/common/get-host-info.sub.js
index 42369c7370b..e9ec61659c3 100644
--- a/tests/wpt/tests/common/get-host-info.sub.js
+++ b/tests/wpt/tests/common/get-host-info.sub.js
@@ -27,6 +27,8 @@ function get_host_info() {
     HTTP_PORT2: HTTP_PORT2,
     HTTPS_PORT: HTTPS_PORT,
     HTTPS_PORT2: HTTPS_PORT2,
+    HTTP_PORT_ELIDED: HTTP_PORT_ELIDED,
+    HTTPS_PORT_ELIDED: HTTPS_PORT_ELIDED,
     PORT: PORT,
     PORT2: PORT2,
     ORIGINAL_HOST: ORIGINAL_HOST,
diff --git a/tests/wpt/tests/console/META.yml b/tests/wpt/tests/console/META.yml
index 60c95d0d579..97fd7cfc93d 100644
--- a/tests/wpt/tests/console/META.yml
+++ b/tests/wpt/tests/console/META.yml
@@ -1,5 +1,4 @@
 spec: https://console.spec.whatwg.org/
 suggested_reviewers:
-  - domenic
   - pwnall
   - domfarolino
diff --git a/tests/wpt/tests/container-timing/resources/container-timing-helpers.js b/tests/wpt/tests/container-timing/resources/container-timing-helpers.js
index 8b3f21dff56..c66797b6041 100644
--- a/tests/wpt/tests/container-timing/resources/container-timing-helpers.js
+++ b/tests/wpt/tests/container-timing/resources/container-timing-helpers.js
@@ -21,13 +21,18 @@ function checkContainerSize(entry, size) {
   assert_equals(entry.size, size);
 }
 
-function finishOnElementTiming(t) {
-  const finish_observer = new PerformanceObserver(() => {
-    requestAnimationFrame(() => { t.done(); });
+function onElementTimingEvent(func) {
+  const finish_observer = new PerformanceObserver((entryList) => {
+    finish_observer.disconnect();
+    requestAnimationFrame(() => { func(); });
   });
   finish_observer.observe({ entryTypes: ['element'] });
 }
 
+function finishOnElementTiming(t) {
+  onElementTimingEvent(() => { t.done(); });
+}
+
 function addPaintingElementTimingAfterDoubleRAF(parent) {
   requestAnimationFrame(() => requestAnimationFrame(() => {
     const finish_img = document.createElement('img');
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
index a6d56db6561..2382c4a6ec7 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
@@ -15,9 +15,9 @@ body {
   let beforeRender;
   async_test(function (t) {
     assert_implements(window.PerformanceContainerTiming, "PerformanceContainerTiming is not implemented");
-    t.step_timeout(() => {
+    onElementTimingEvent(() => {
       const observer = new PerformanceObserver(
-        t.step_func_done(function(entryList) {
+        t.step_func_done((entryList) => {
           assert_equals(entryList.getEntries().length, 1);
           const entry = entryList.getEntries()[0];
           checkContainerEntry(entry, 'image_ct', 'my_id', beforeRender);
@@ -26,7 +26,7 @@ body {
         })
       );
       observer.observe({type: 'container', buffered: true });
-    }, 2000);
+    });
 
     // Add image of width equal to 100 and height equal to 100.
     const img = document.createElement('img');
@@ -36,6 +36,8 @@ body {
     document.body.appendChild(img);
 
     beforeRender = performance.now();
+
+    addPaintingElementTimingAfterDoubleRAF(document.body);
   }, 'Paint is reported when observation starts after image paint if buffering is enabled.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
index 8544ffd995e..0e11265056f 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
@@ -14,17 +14,16 @@ body {
 <script>
   async_test(function (t) {
     assert_implements(window.PerformanceContainerTiming, "PerformanceContainerTiming is not implemented");
-    t.step_timeout(() => {
+
+    onElementTimingEvent(()=> {
       const observer = new PerformanceObserver(
-        t.step_func_done(function(entryList) {
+        t.step_func_done(function (entryList) {
           assert_unreached("Painting happened before observing, it should not create a containertiming entry");
         })
       );
-      observer.observe({type: 'container', buffered: false });
-      t.step_timeout(() => {
-        t.done();
-      }, 2000);
-    }, 2000);
+      observer.observe({ type: 'container', buffered: false });
+      t.step_timeout(() => { t.done(); }, 1000);
+    });
 
     // Add image of width equal to 100 and height equal to 100.
     const img = document.createElement('img');
@@ -32,7 +31,9 @@ body {
     img.setAttribute('containertiming', 'image_ct');
     img.setAttribute('id', 'my_id');
     document.body.appendChild(img);
-  }, 'containertiming does not report paints before observing if buffering is disabled.');
+
+    addPaintingElementTimingAfterDoubleRAF(document.body);
+}, 'containertiming does not report paints before observing if buffering is disabled.');
 </script>
 
 </body>
diff --git a/tests/wpt/tests/cookies/README.md b/tests/wpt/tests/cookies/README.md
index ed86aebf183..b2bdaafa357 100644
--- a/tests/wpt/tests/cookies/README.md
+++ b/tests/wpt/tests/cookies/README.md
@@ -1,2 +1,7 @@
-This directory contains tests for
-[Leave Secure Cookies Alone](https://tools.ietf.org/html/draft-ietf-httpbis-cookie-alone-01).
+This directory contains tests for various efforts related to the
+standardization of cookies, in different states of maturity:
+
+* [Cookies: HTTP State Management Mechanism](https://datatracker.ietf.org/doc/draft-ietf-httpbis-rfc6265bis/)
+* [Cookies Having Independent Partitioned State](https://www.ietf.org/archive/id/draft-cutler-httpbis-partitioned-cookies-00.html)
+* [Origin Bound Cookies](https://github.com/sbingler/Origin-Bound-Cookies)
+
diff --git a/tests/wpt/tests/css/css-anchor-position/align-dialog-001.html b/tests/wpt/tests/css/css-anchor-position/align-dialog-001.html
new file mode 100644
index 00000000000..ba3a2b5c759
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/align-dialog-001.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>Tests the dialog keyword is parsed and computed as specified</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#conditional-centering">
+<link rel="author" href="mailto:tabatkins@google.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+
+<div id="container">
+  <div id="target"></div>
+</div>
+
+<script>
+test_valid_value('align-self', 'dialog');
+test_valid_value('align-items', 'dialog');
+test_valid_value('justify-self', 'dialog');
+test_valid_value('justify-items', 'dialog');
+
+test_computed_value('align-self', 'dialog');
+test_computed_value('align-items', 'dialog');
+test_computed_value('justify-self', 'dialog');
+test_computed_value('justify-items', 'dialog');
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/align-dialog-002-ref.html b/tests/wpt/tests/css/css-anchor-position/align-dialog-002-ref.html
new file mode 100644
index 00000000000..88ba8a7e846
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/align-dialog-002-ref.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<title>Tests the dialog keyword is parsed and computed as specified</title>
+<link rel="author" href="mailto:tabatkins@google.com">
+
+<style>
+.container {
+  position: relative;
+  width: 100px;
+  height: 100px;
+  border: 1px solid;
+  margin: 1em;
+  anchor-scope: all;
+}
+.anchor {
+  border: solid blue 15px;
+  width: 0;
+  margin: 25px;
+  anchor-name: --foo;
+}
+.abspos {
+  position: absolute;
+  position-anchor: --foo;
+  border: solid orange 10px;
+  inset: 0;
+}
+</style>
+
+/* Should be centered, no position-area */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos" style="place-self: center"></div>
+</div>
+
+/* Centered in an offset box */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos" style="place-self: center; left: anchor(left); top: anchor(top)"></div>
+</div>
+
+/* Anchor-centered on the left side. */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos" style="place-self: normal; position-area: left span-all"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/align-dialog-002.html b/tests/wpt/tests/css/css-anchor-position/align-dialog-002.html
new file mode 100644
index 00000000000..d0164ca1046
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/align-dialog-002.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>Tests the dialog keyword is parsed and computed as specified</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#conditional-centering">
+<link rel="match" href="align-dialog-002-ref.html">
+<link rel="author" href="mailto:tabatkins@google.com">
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+
+<style>
+.container {
+  position: relative;
+  width: 100px;
+  height: 100px;
+  border: 1px solid;
+  margin: 1em;
+  anchor-scope: all;
+}
+.anchor {
+  border: solid blue 15px;
+  width: 0;
+  margin: 25px;
+  anchor-name: --foo;
+}
+.abspos {
+  position: absolute;
+  position-anchor: --foo;
+  border: solid orange 10px;
+  place-self: dialog;
+  inset: 0;
+}
+</style>
+
+/* Should be centered, no position-area */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos"></div>
+</div>
+
+/* Centered in an offset box */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos" style="left: anchor(left); top: anchor(top)"></div>
+</div>
+
+/* Anchor-centered on the left side. */
+<div class="container">
+  <div class="anchor"></div>
+  <div class="abspos" style="position-area: left span-all"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html b/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
index 2b21634be94..f7ce8eb68eb 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#target">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#determining">
 <link rel="author" href="mailto:kojii@chromium.org">
 <script src="/resources/testharness.js"></script>
@@ -34,11 +35,13 @@
   <div class="container relpos">
     <div style="height: 150px"></div>
     <div class="relpos">
-      <span class="target" data-expected-width=20></span>
+      <span class="target" data-expected-width=30></span>
       <span class="relpos">
-        <span class="target" data-expected-width=20></span>
+        <span class="target" data-expected-width=30></span>
         <span class="relpos">
+          <span class="target" data-expected-width=20></span>
           <span class="anchor">12</span>
+          <span class="target" data-expected-width=20></span>
           <span class="anchor abspos">123</span>
           <span class="target" data-expected-width=30></span>
         </span>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001-ref.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001-ref.html
new file mode 100644
index 00000000000..d21d1545fac
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<style>
+.columns {
+  column-count: 3;
+  column-fill: auto;
+  column-gap: 10px;
+  width: 620px;
+  height: 100px;
+}
+.fakeanchor {
+  box-sizing: border-box;
+  border: 2px solid lime;
+  border-width: 5px 6px 7px 8px;
+  margin-left: 100px;
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+</style>
+<p>There should be a green square with a lime border, split over two
+  columns. There should be no red.</p>
+<div class="columns">
+  <div style="height:60px;"></div>
+  <div class="fakeanchor"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001.html
index 006c4b851d5..8d0c4381d50 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-grid-001.html
@@ -2,10 +2,8 @@
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-size">
 <link rel="author" href="mailto:kojii@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/check-layout-th.js"></script>
-<script src="support/test-common.js"></script>
+<link rel="author" href="mailto:mstensho@chromium.org">
+<link rel="match" href="anchor-position-grid-001-ref.html">
 <style>
 .cb {
   position: relative;
@@ -22,15 +20,13 @@
   grid-template-columns: repeat(2, 100px);
   grid-template-rows: 50px 100px;
 }
-.spacer {
-  background: yellow;
-}
 .anchor1 {
   anchor-name: --a1;
   grid-column: 2;
   grid-row: 2;
-  border: 2px solid orange;
+  border: 2px solid red;
   border-width: 5px 6px 7px 8px;
+  background: green;
 }
 .target {
   grid-column: 2;
@@ -39,7 +35,6 @@
   width: anchor-size(--a1 width);
   height: anchor-size(--a1 height);
   background: lime;
-  opacity: .2;
 }
 .target1-l {
   left: anchor(--a1 left);
@@ -59,25 +54,22 @@
 .target1-b {
   right: anchor(--a1 right);
   bottom: anchor(--a1 bottom);
-  height: 5px;
+  height: 7px;
 }
 </style>
-<body onload="checkLayoutForAnchorPos('.target')">
-  <div>
-    <div class="spacer" style="height: 10px"></div>
-    <div class="columns">
-      <div class="spacer" style="height: 10px"></div>
-      <div class="grid cb">
-        <div>1</div>
-        <div>2</div>
-        <div>3</div>
-        <div class="anchor1"></div>
+<p>There should be a green square with a lime border, split over two
+  columns. There should be no red.</p>
+<div class="columns">
+  <div style="height: 10px"></div>
+  <div class="grid cb">
+    <div><br></div>
+    <div><br></div>
+    <div><br></div>
+    <div class="anchor1"></div>
 
-        <div class="target target1-l" data-offset-x=100 data-expected-height=100></div>
-        <div class="target target1-r" data-offset-x=194 data-expected-height=100></div>
-        <div class="target target1-t" data-offset-y=50 data-expected-width=100></div>
-        <div class="target target1-b" data-offset-y=145 data-expected-width=100></div>
-      </div>
-    </div>
+    <div class="target target1-l" data-offset-x=100 data-expected-height=100></div>
+    <div class="target target1-r" data-offset-x=194 data-expected-height=100></div>
+    <div class="target target1-t" data-offset-y=50 data-expected-width=100></div>
+    <div class="target target1-b" data-offset-y=145 data-expected-width=100></div>
   </div>
-</body>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004-ref.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004-ref.html
new file mode 100644
index 00000000000..897270dca43
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<style>
+  .container {
+    display: flow-root;
+    position: relative;
+    margin-bottom: 20px;
+  }
+</style>
+<p>There should be no red below, only green.</p>
+<div style="height:10px;"></div>
+<div class="container">
+  <div style="margin-left:50px; width:20px; height:10px; background:green;"></div>
+</div>
+<div class="container">
+  <div style="width:100px; height:20px; background:green;"></div>
+</div>
+<div class="container">
+  <div style="width:70px; height:20px; background:green;"></div>
+</div>
+<div class="container">
+  <div style="float:left; margin-left:110px; margin-top:40px; width:10px; height:10px; background:green;"></div>
+  <div style="float:left; margin-left:10px; margin-top:40px; width:20px; height:10px; background:green;"></div>
+  <div style="float:left; margin-left:10px; width:80px; height:50px; background:green;"></div>
+  <div style="float:left; margin-left:10px; width:30px; height:10px; background:green;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004.html
index be074f91bf9..12220bcc87d 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-inline-004.html
@@ -3,10 +3,8 @@
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-size">
 <link rel="author" href="mailto:kojii@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/check-layout-th.js"></script>
-<script src="support/test-common.js"></script>
+<link rel="author" href="mailto:mstensho@chromium.org">
+<link rel="match" href="anchor-position-inline-004-ref.html">
 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
 <style>
 body > div {
@@ -18,6 +16,9 @@ body > div {
 .cb {
   position: relative;
 }
+body > .cb {
+  margin-bottom: 20px;
+}
 .columns {
   column-count: 3;
   column-fill: auto;
@@ -27,7 +28,6 @@ body > div {
   widows: 1;
   width: 32em;
   height: 50px;
-  background: yellow;
 }
 .anchor1 {
   anchor-name: --a1;
@@ -35,8 +35,6 @@ body > div {
 }
 .target {
   position: absolute;
-  background: lime;
-  opacity: .2;
 }
 .target1-pos {
   left: anchor(--a1 left);
@@ -50,132 +48,151 @@ body > div {
   width: anchor-size(--a1 width);
   height: anchor-size(--a1 height);
 }
+.target::before {
+  position: absolute;
+  background: green;
+  content: "";
+}
+.target.part1::before {
+  width: 30%;
+  height: 50%;
+}
+.target.part2::before {
+  left: 30%;
+  width: 30%;
+  height: 50%;
+}
+.target.part3::before {
+  left: 60%;
+  width: 40%;
+  height: 50%;
+}
+.target.part4::before {
+  top: 50%;
+  width: 30%;
+  height: 50%;
+}
+.target.part5::before {
+  top: 50%;
+  left: 30%;
+  width: 30%;
+  height: 50%;
+}
+.target.part6::before {
+  top: 50%;
+  left: 60%;
+  width: 40%;
+  height: 50%;
+}
+#mc_part1::before {
+  width: 40px;
+  height: 25px;
+}
+#mc_part2::before {
+  left: 40px;
+  width: 40px;
+  height: 25px;
+}
+#mc_part3::before {
+  top: 25px;
+  width: 40px;
+  height: 25px;
+}
+#mc_part4::before {
+  top: 25px;
+  left: 40px;
+  width: 40px;
+  height: 25px;
+}
 </style>
-<script>
-  function onload() {
-    document.fonts.ready.then(() => checkLayoutForAnchorPos('.target'));
-  }
-</script>
-<body onload="onload()">
-  <!-- The inline anchor appear in a single line inline containing block. -->
-  <div class="cb">
-    <div>spacer</div>
-    <div>
-      0
-      <span class="cb">
-        12
-        <span class="anchor1">a1</span>
-        34
-        <span class="target target1-pos"
-              data-offset-x=30 data-offset-y=0
-              data-expected-width=20 data-expected-height=10></span>
-        <span class="target target1-size"
-              data-offset-x=30 data-offset-y=0
-              data-expected-width=20 data-expected-height=10></span>
-      </span>
-      <span class="target target1-pos"
-            data-offset-x=50 data-offset-y=10
-            data-expected-width=20 data-expected-height=10></span>
-      <span class="target target1-size"
-            data-offset-x=50 data-offset-y=10
-            data-expected-width=20 data-expected-height=10></span>
-    </div>
-    <span class="target target1-pos"
-          data-offset-x=50 data-offset-y=10
-          data-expected-width=20 data-expected-height=10></span>
-    <span class="target target1-size"
-          data-offset-x=50 data-offset-y=10
-          data-expected-width=20 data-expected-height=10></span>
-  </div>
+<p>There should be no red below, only green.</p>
 
-  <!-- The inline anchor and inline containing block wrap to two lines. -->
-  <div class="cb">
-    <div>
-      0
-      <span class="cb">
-        12
-        <span class="anchor1">a1 a1 a1</span>
-        345
-        <span class="target target1-pos"
-              data-offset-x=-20 data-offset-y=0
-              data-expected-width=100 data-expected-height=20></span>
-        <span class="target target1-size"
-              data-offset-x=-20 data-offset-y=0
-              data-expected-width=100 data-expected-height=20></span>
-      </span>
-      <span class="target target1-pos"
-            data-offset-x=0 data-offset-y=0
-            data-expected-width=100 data-expected-height=20></span>
-      <span class="target target1-size"
-            data-offset-x=0 data-offset-y=0
-            data-expected-width=100 data-expected-height=20></span>
-    </div>
-    <span class="target target1-pos"
-          data-offset-x=0 data-offset-y=0
-          data-expected-width=100 data-expected-height=20></span>
-    <span class="target target1-size"
-          data-offset-x=0 data-offset-y=0
-          data-expected-width=100 data-expected-height=20></span>
+<!-- The inline anchor appear in a single line inline containing block. -->
+<div class="cb" style="color:transparent;">
+  <div><br></div>
+  <div>
+    0
+    <span class="cb">
+      12
+      <span class="anchor1">a1</span>
+      34
+      <span class="target target1-pos part1"></span>
+      <span class="target target1-size part2"></span>
+    </span>
+    <span class="target target1-pos part3"></span>
+    <span class="target target1-size part4"></span>
   </div>
+  <span class="target target1-pos part5"></span>
+  <span class="target target1-size part6"></span>
+</div>
 
-  <!-- The inline anchor and inline containing block have forced line breaks. -->
-  <div class="cb">
-    <div>
-      0
-      <span class="cb">
-        12
-        <span class="anchor1">a1<br>a1</span>
-        345
-        <span class="target target1-pos"
-              data-offset-x=-20 data-offset-y=0
-              data-expected-width=70 data-expected-height=20></span>
-        <span class="target target1-size"
-              data-offset-x=-20 data-offset-y=0
-              data-expected-width=70 data-expected-height=20></span>
-      </span>
-      <span class="target target1-pos"
-            data-offset-x=0 data-offset-y=0
-            data-expected-width=70 data-expected-height=20></span>
-      <span class="target target1-size"
-            data-offset-x=0 data-offset-y=0
-            data-expected-width=70 data-expected-height=20></span>
-    </div>
-    <span class="target target1-pos"
-          data-offset-x=0 data-offset-y=0
-          data-expected-width=70 data-expected-height=20></span>
-    <span class="target target1-size"
-          data-offset-x=0 data-offset-y=0
-          data-expected-width=70 data-expected-height=20></span>
+<!-- The inline anchor and inline containing block wrap to two lines. -->
+<div class="cb" style="color:red;">
+  <div>
+    0
+    <span class="cb">
+      12
+      <span class="anchor1">a1 a1 a1</span>
+      345
+      <span class="target target1-pos part1"></span>
+      <span class="target target1-size part2"></span>
+    </span>
+    <span class="target target1-pos part3"></span>
+    <span class="target target1-size part4"></span>
   </div>
+  <span class="target target1-pos part5"></span>
+  <span class="target target1-size part6"></span>
+</div>
 
-  <!-- The inline anchor and inline containing block wrap to two columns. -->
-  <div class="cb columns">
-    <div class="spacer" style="height: 90px"></div>
-    <div>
-      0
-      <span class="cb">
-        12
-        <span class="anchor1">a1 a1 a1</span>
-        345
-        <span class="target target1-pos"
-              data-offset-x=30 data-offset-y=-40
-              data-expected-width=80 data-expected-height=50></span>
-        <span class="target target1-size"
-              data-offset-x=30 data-offset-y=-40
-              data-expected-width=80 data-expected-height=50></span>
-      </span>
-      <span class="target target1-pos"
-            data-offset-x=160 data-offset-y=0
-            data-expected-width=80 data-expected-height=50></span>
-      <span class="target target1-size"
-            data-offset-x=160 data-offset-y=0
-            data-expected-width=80 data-expected-height=50></span>
-    </div>
-    <span class="target target1-pos"
-          data-offset-x=160 data-offset-y=0
-          data-expected-width=80 data-expected-height=50></span>
-    <span class="target target1-size"
-          data-offset-x=160 data-offset-y=0
-          data-expected-width=80 data-expected-height=50></span>
+<!-- The inline anchor and inline containing block have forced line breaks. -->
+<div class="cb" style="color:red;">
+  <div>
+    0
+    <span class="cb">
+      12
+      <span class="anchor1">a1<br>a1</span>
+      345
+      <span class="target target1-pos part1"></span>
+      <span class="target target1-size part2"></span>
+    </span>
+    <span class="target target1-pos part3"></span>
+    <span class="target target1-size part4"></span>
   </div>
-</body>
+  <span class="target target1-pos part5"></span>
+  <span class="target target1-size part6"></span>
+</div>
+
+<!-- The inline anchor and inline containing block wrap to two columns. -->
+<div class="cb columns" style="color:red;">
+  <div class="spacer" style="height: 90px"></div>
+  <div>
+    0
+    <span class="cb">
+      12
+      <!-- The anchor begins at the end of the last line in one column, and
+           ends on the first line in the next column.-->
+      <span class="anchor1">a1 a1 a1</span>
+      345
+      <!-- The containing block of the next two anchor-positioned elements are
+           part of the fragmentation context. The anchor rectangle is the
+           bounding box of the two fragments (one on each line) within the
+           fragmented flow, pretending that everything is stacked on top of
+           each other (the final visual position of the columns is not
+           something we can (or should) see from within the fragmentation
+           context. Fill the parts that are not filled by the final four
+           elements (see below). -->
+      <span class="target target1-pos" style="color: green;">
+        0 12
+      </span>
+      <span class="target target1-size" style="color:green;">
+        <br>&nbsp;&nbsp; 345
+      </span>
+    </span>
+    <!-- The containing block of the below anchor-positioned elements are not
+         part of the fragmentation context. -->
+    <span class="target target1-pos" id="mc_part1"></span>
+    <span class="target target1-size" id="mc_part2"></span>
+  </div>
+  <span class="target target1-pos" id="mc_part3"></span>
+  <span class="target target1-size" id="mc_part4"></span>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-007.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-007.html
index b8aca116447..2302731c737 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-007.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-007.html
@@ -2,13 +2,12 @@
 <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-pos">
 <style>
-  #query_elm {
+  .query_elm {
     position: absolute;
     left: anchor(--a1 left);
     top: anchor(--a1 top);
     right: anchor(--a1 right);
     bottom: anchor(--a1 bottom);
-    background: green;
   }
 </style>
 <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
@@ -19,7 +18,16 @@
     <div style="position:relative; inline-size:100px; block-size:200px;">
       <div style="block-size:20px;"></div>
       <div style="anchor-name:--a1; inline-size:20px; block-size:70px;"></div>
-      <div id="query_elm"></div>
+      <!-- The containing block of this anchored element is inside the
+           fragmentation context. -->
+      <div class="query_elm" style="background: green;"></div>
+    </div>
+    <!-- The containing block of this anchored element is *not* inside the
+         fragmentation context. Fill what's left. -->
+    <div class="query_elm">
+      <div style="margin-inline-end:20px; block-size:20px; background:green;"></div>
+      <div style="block-size:30px; background:green;"></div>
+      <div style="margin-inline-start:20px; block-size:50px; background:green;"></div>
     </div>
   </div>
 </div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-008.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-008.html
index f652b6ac2b0..7704df90b1e 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-008.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-008.html
@@ -2,13 +2,10 @@
 <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-pos">
 <style>
-  #query_elm {
+  .query_elm {
     position: absolute;
     left: anchor(--a1 left);
     top: anchor(--a1 top);
-    width: 80px;
-    height: 100px;
-    background: green;
   }
 </style>
 <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
@@ -19,7 +16,16 @@
     <div style="position:relative; inline-size:100px; block-size:100px;">
       <div style="block-size:20px;"></div>
       <div style="anchor-name:--a1; inline-size:50px; block-size:70px;"></div>
-      <div id="query_elm"></div>
+      <!-- The containing block of this anchored element is inside the
+           fragmentation context. -->
+      <div class="query_elm" style="width:100%; height:100%;">
+        <div style="block-size:50px; background:green;"></div>
+      </div>
+    </div>
+    <!-- The containing block of this anchored element is *not* inside the
+         fragmentation context. Fill what's left. -->
+    <div class="query_elm" style="width:80px; height:100px;">
+      <div style="block-size:30px; inline-size:100px; background:green;"></div>
     </div>
   </div>
 </div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-012.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-012.html
new file mode 100644
index 00000000000..7618dd80933
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-012.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>Anchors with same name, one crossing column boundaries.</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="columns:2; column-fill:auto; gap:0; width:100px; height:100px; background:red;">
+  <div style="position:relative;">
+    <div style="position:relative;">
+      <div style="anchor-name:--a1; margin-left:10px; height:20px;"></div>
+      <div style="anchor-name:--a1; position:absolute; left:0px; top:30px; right:0; height:170px;"></div>
+    </div>
+    <div style="position:absolute; left:anchor(--a1 left); top:anchor(--a1 top); width:50px; height:200px; margin-top:-30px; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-013.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-013.html
new file mode 100644
index 00000000000..10a37a0ad64
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-013.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>Anchor and OOF, column balancing - vertical-rl</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode:vertical-rl; columns:5; gap:0; width:100px; height:100px; background:red;">
+  <div style="block-size:110px; background:green;"></div>
+  <div style="position:relative;">
+    <div style="block-size:110px; background:green;"></div>
+    <div style="anchor-name:--a; inline-size:10px; block-size:110px; background:green;"></div>
+    <div style="block-size:170px; background:green;"></div>
+    <div style="position:absolute; position-anchor:--a; position-area:inline-end center; inline-size:10px; block-size:100%; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-014.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-014.html
new file mode 100644
index 00000000000..969ec8f3c42
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-014.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>OOF Anchor and OOF, column balancing - vertical-rl</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode:vertical-rl; columns:5; gap:0; width:100px; height:100px; background:red;">
+  <div style="block-size:110px; background:green;"></div>
+  <div style="position:relative;">
+    <div style="block-size:110px; background:green;"></div>
+    <div style="position:relative; block-size:110px;">
+      <div style="anchor-name:--a; position:absolute; inline-size:10px; block-size:110px; background:green;"></div>
+    </div>
+    <div style="block-size:170px; background:green;"></div>
+    <div style="position:absolute; position-anchor:--a; position-area:inline-end center; inline-size:10px; block-size:100%; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-015.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-015.html
new file mode 100644
index 00000000000..1a5c2881de6
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-015.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>Anchor and OOF before spanner - vertical-rl</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode:vertical-rl; columns:5; gap:0; width:100px; height:100px; background:red;">
+  <div style="block-size:90px; background:green;"></div>
+  <div style="position:relative;">
+    <div style="block-size:90px; background:green;"></div>
+    <div style="anchor-name:--a; inline-size:10px; block-size:90px; background:green;"></div>
+    <div style="block-size:130px; background:green;"></div>
+    <div style="position:absolute; position-anchor:--a; position-area:inline-end center; inline-size:10px; block-size:100%; background:green;"></div>
+    <div style="column-span:all; block-size:10px; background:green;"></div>
+    <div style="block-size:50px; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-016.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-016.html
new file mode 100644
index 00000000000..85eddfca08b
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-016.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>Anchor before spanner, OOF after spanner - vertical-rl</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode:vertical-rl; columns:5; gap:0; width:100px; height:100px; background:red;">
+  <div style="block-size:90px; background:green;"></div>
+  <div style="position:relative;">
+    <div style="block-size:90px; background:green;"></div>
+    <div style="anchor-name:--a; inline-size:10px; block-size:90px; background:green;"></div>
+    <div style="block-size:130px; background:green;"></div>
+    <div style="column-span:all; block-size:10px; background:green;"></div>
+    <div style="block-size:50px; background:green;"></div>
+    <div style="position:absolute; position-anchor:--a; position-area:inline-end center; inline-size:10px; block-size:100%; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-017.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-017.html
new file mode 100644
index 00000000000..3e8c35a9d3c
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-017.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Anchor and OOF after spanner - vertical-rl</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-anchor">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode:vertical-rl; columns:5; gap:0; width:100px; height:100px; background:red;">
+  <div style="position:relative;">
+    <div style="block-size:50px; background:green;"></div>
+    <div style="column-span:all; block-size:10px; background:green;"></div>
+    <div style="block-size:180px; background:green;"></div>
+    <div style="anchor-name:--a; inline-size:10px; block-size:90px; background:green;"></div>
+    <div style="block-size:130px; background:green;"></div>
+    <div style="position:absolute; position-anchor:--a; position-area:inline-end center; inline-size:10px; block-size:100%; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001-ref.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001-ref.html
new file mode 100644
index 00000000000..729c0a66024
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<p>There should only be green below, and no red.</p>
+<div style="height: 10px"></div>
+<div style="display:flow-root; width:630px;">
+  <div style="float:left; margin-left:174px; width:70px;">
+    <div style="width:10px; height:10px; background:green;"></div>
+    <div style="margin-top:6px; width:10px; height:10px; background:green;"></div>
+    <div style="margin-top:56px; width:20px; height:18px; background:green;"></div>
+  </div>
+  <div style="float:left; width:90px;">
+    <div style="margin-top:16px; width:20px; height:84px; background:green;"></div>
+  </div>
+  <div style="float:left; width:80px;">
+    <div style="width:20px; height:48px; margin-bottom:42px; background:green;"></div>
+    <div style="margin-left:10px; width:10px; height:10px; background:green;"></div>
+  </div>
+  <div style="float:left; width:10px; height:10px; margin-top:38px; background:green;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001.html
index c5ce41299af..70a8e2a7bfb 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-multicol-nested-001.html
@@ -4,40 +4,36 @@
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-size">
 <link rel="author" href="mailto:kojii@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/check-layout-th.js"></script>
-<script src="support/test-common.js"></script>
+<link rel="author" href="mailto:mstensho@chromium.org">
+<link rel="match" href="anchor-position-multicol-nested-001-ref.html">
 <style>
 .cb {
   position: relative;
+}
+body > * .cb {
   border-style: solid;
+  border-color: transparent;
   border-width: 3px 2px 4px 1px;
   padding: 3px 2px 4px 1px;
 }
 .columns {
-  column-count: 4;
+  columns: 4;
   column-fill: auto;
   column-gap: 10px;
-  column-width: 150px;
   width: 630px;
   height: 100px;
 }
 .columns .columns {
-  column-count: 2;
-  column-width: 60px;
+  columns: 2;
   width: 130px;
   height: 200px;
 }
-.spacer {
-  background: pink;
-}
 .anchor1 {
   anchor-name: --a1;
   margin-left: 10px;
   width: 20px;
   height: 150px;
-  background: blue;
+  background: red;
 }
 .target {
   position: absolute;
@@ -45,36 +41,44 @@
   top: anchor(--a1 top);
   width: anchor-size(--a1 width);
   height: anchor-size(--a1 height);
-  background: lime;
-  opacity: .3;
 }
 </style>
-<body onload="checkLayoutForAnchorPos('.target')">
-  <p>The green box should be a union of blue boxes,
-    and the purple box should be at the right-bottom of the green box.
-  </p>
-  <div class="cb">
-    <div class="spacer" style="height: 10px"></div>
-    <div class="columns">
-      <div class="cb">
-        <div class="spacer" style="height: 110px"></div>
-        <div class="columns">
-          <div class="cb">
-            <div class="spacer" style="height: 60px"></div>
-            <div class="anchor1"></div>
-            <div class="spacer" style="height: 80px"></div>
-            <div class="target"
-                 data-offset-x=11 data-offset-y=-19
-                 data-expected-width=180 data-expected-height=100></div>
+<p>There should only be green below, and no red.</p>
+<div class="cb">
+  <div style="height: 10px"></div>
+  <div class="columns">
+    <div class="cb">
+      <div style="height: 110px"></div>
+      <div class="columns">
+        <div class="cb">
+          <div style="height: 60px"></div>
+          <div class="anchor1"></div>
+          <div style="height: 80px"></div>
+          <div class="target">
+            <div style="width:20px;">
+              <div style="height:10px; background:green;"></div>
+              <div style="margin-left:10px; height:8px; background:green;"></div>
+              <div style="margin-right:10px; height:10px; background:green;"></div>
+              <div style="height:74px; background:green;"></div>
+              <div style="margin-right:10px; height:10px; background:green;"></div>
+              <div style="height:28px; background:green;"></div>
+              <div style="margin-left:10px; height:10px; background:green;"></div>
+            </div>
           </div>
         </div>
-        <div class="target" style="background:hotpink;"
-             data-offset-x=173 data-offset-y=-3
-             data-expected-width=180 data-expected-height=100></div>
+      </div>
+      <div class="target">
+        <div style="position:absolute; top:0; left:0; width:10px; height:10px; background:green;"></div>
+        <div style="position:absolute; top:0; right:0; width:10px; height:10px; background:green;"></div>
+        <div style="position:absolute; bottom:0; left:0; width:10px; height:10px; background:green;"></div>
+        <div style="position:absolute; bottom:0; right:0; width:10px; height:10px; background:green;"></div>
       </div>
     </div>
-    <div class="target"
-         data-offset-x=175 data-offset-y=13
-         data-expected-width=180 data-expected-height=100></div>
   </div>
-</body>
+  <div class="target">
+    <div style="position:absolute; top:0; left:0; width:10px; height:10px; background:green;"></div>
+    <div style="position:absolute; top:0; right:0; width:10px; height:10px; background:green;"></div>
+    <div style="position:absolute; bottom:0; left:0; width:10px; height:10px; background:green;"></div>
+    <div style="position:absolute; bottom:0; right:0; width:10px; height:10px; background:green;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-chained-003.html b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-chained-003.html
index 5f4c0ff3006..213da7ead5a 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-chained-003.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-chained-003.html
@@ -2,7 +2,7 @@
 <title>Tests scroll adjustments of element anchored to another anchored element</title>
 <link rel="author" href="mailto:wangxianzhu@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
-<link rel="match" href="reference/anchor-scroll-chained-002-ref.html">
+<link rel="match" href="reference/anchor-scroll-chained-003-ref.html">
 <style>
 body {
   margin: 0;
diff --git a/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none-ref.html b/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none-ref.html
new file mode 100644
index 00000000000..da796dc5bb5
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+This is visible.
diff --git a/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none.html b/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none.html
new file mode 100644
index 00000000000..8628d5311f0
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchored-transition-display-none.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html id=html class="reftest-wait">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1">
+<link rel="match" href="anchored-transition-display-none-ref.html">
+This is visible.
+<div>FAIL if this is visible</div>
+
+<style>
+div {
+  position-area: end;
+  position: absolute;
+  border: 1px solid;
+  transition-behavior: allow-discrete;
+  transition-duration: 0.01s;
+}
+</style>
+<script>
+    html.addEventListener('transitionend', () => {
+        html.classList.toggle('reftest-wait')
+    });
+
+    document.body.offsetLeft;
+    document.querySelector("div").style.display = "none";
+</script>
+
diff --git a/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-implicit-any.html b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-implicit-any.html
new file mode 100644
index 00000000000..e92e7edc43b
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-implicit-any.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>CSS Conditional Test: @container anchored(fallback) matching implicit 'any' &lt;position-area&gt;</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #anchor {
+    anchor-name: --a;
+    width: 100px;
+    height: 100px;
+  }
+  #anchored {
+    position: absolute;
+    position-anchor: --a;
+    position-area: top;
+    position-try-fallbacks: right span-bottom;
+    width: 100px;
+    /* Too tall to fit over the anchor to trigger fallback */
+    height: 100px;
+    container-type: anchored;
+  }
+  #target {
+    /* Implicit 'any' for the horizontal part of the query */
+    @container anchored(fallback: span-bottom) { --span-bottom: yes; }
+    /* Implicit 'any' for the vertical part of the query */
+    @container anchored(fallback: right) { --right: yes; }
+  }
+</style>
+<div id="anchor"></div>
+<div id="anchored">
+  <div id="target"></div>
+</div>
+<script>
+  test(() => {
+    const style = getComputedStyle(target);
+    assert_equals(style.getPropertyValue("--span-bottom"), "yes");
+    assert_equals(style.getPropertyValue("--right"), "yes");
+  }, "@container anchored(fallback: <position-area>) querying single axis with implicit 'any'");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.html
similarity index 95%
rename from tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html
rename to tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.html
index 51ed84fd3ad..321d2f1ec86 100644
--- a/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html
+++ b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <title>CSS Conditional Test: @container anchored(fallback) matching 'any' &lt;position-area&gt;</title>
 <link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12610">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
diff --git a/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html b/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.html
similarity index 92%
rename from tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html
rename to tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.html
index b4582e11a15..ef850579d50 100644
--- a/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html
+++ b/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <title>CSS Conditional Test: @container anchored query parsing - 'any' position-area</title>
 <link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12610">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
diff --git a/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center-ref.html b/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center-ref.html
new file mode 100644
index 00000000000..0dfdc0272ef
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center-ref.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<title>Tests that 'anchor-center' behaves as 'center' when no anchor in containing block</title>
+<style>
+.anchor {
+  background: orange;
+  width: 100px;
+  background-color: orange;
+}
+.container {
+  position: fixed;
+  top: 20px;
+  left: 50px;
+  width: 300px;
+  height: 200px;
+  display: flex;
+  background: green;
+  justify-content: center;
+}
+.target {
+  position: absolute;
+  margin: 0 auto;
+  width: 80px;
+  border: 1px #000 solid;
+  background: lime;
+}
+</style>
+<div class="anchor">anchor</div>
+<div class="container">
+  <div class="target">target 1</div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center.html b/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center.html
new file mode 100644
index 00000000000..a3ac8477edd
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/no-anchor-anchor-center.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<title>Tests that 'anchor-center' behaves as 'center' when no anchor in containing block</title>
+<link rel="match" href="no-anchor-anchor-center-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#valdef-justify-self-anchor-center">
+<style>
+.anchor {
+  anchor-name: --dropdownAnchor;
+  background: orange;
+  width: 100px;
+  background-color: orange;
+}
+.container {
+  position: fixed;
+  top: 20px;
+  left: 50px;
+  width: 300px;
+  height: 200px;
+  background: green;
+}
+.target {
+  position-anchor: --dropdownAnchor;
+  display: flow;
+  left: 10px;
+  right: 10px;
+  position: absolute;
+  justify-self: anchor-center;
+  width: 80px;
+  border: 1px #000 solid;
+  background: lime;
+}
+</style>
+<div class="anchor">anchor</div>
+<div class="container">
+  <div class="target">target 1</div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested-ref.html b/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested-ref.html
new file mode 100644
index 00000000000..d1e72075b44
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<style>
+.container {
+    position: relative;
+    width: 100px;
+    height: 100px;
+    background: green;
+}
+</style>
+<div class=container>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested.html b/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested.html
new file mode 100644
index 00000000000..0d35dec7408
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/position-visibility-no-overflow-nested.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Anchor Positioning Test: position-visibility</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-visibility">
+<link rel="match" href="position-visibility-no-overflow-nested-ref.html">
+<style>
+.container {
+    position: relative;
+    width: 100px;
+    height: 100px;
+    background: green;
+}
+.outer {
+    position: absolute;
+    top: 10px;
+    width: 100px;
+    height: 100px;
+    background: yellow;
+    position-visibility: no-overflow;
+}
+.inner {
+    position: absolute;
+    width: 50px;
+    height: 50px;
+    background: red;
+    position-visibility: no-overflow;
+}
+</style>
+<div class=container>
+    <div class=outer>
+        Outer overflows.
+        <div class=inner>
+            Inner doesn't but still shouldn't be visible.
+        </div>
+    </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-003-ref.html b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-003-ref.html
new file mode 100644
index 00000000000..f0ad702799d
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-003-ref.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<style>
+body {
+  margin: 0;
+}
+
+div {
+  width: 100px;
+  height: 100px;
+}
+
+#scroller1 {
+  width: 200px;
+  height: 200px;
+  position: relative;
+}
+
+#scroller1,#scroller2 {
+  overflow: scroll;
+}
+
+#anchor {
+  height: 20px;
+  background: orange;
+}
+
+#anchored1 {
+  position: absolute;
+  top: 70px;
+  background: green;
+  z-index: 1;
+}
+
+#anchored2 {
+  position: absolute;
+  top: 170px;
+  background: lime;
+}
+
+</style>
+
+<div id="anchored2"></div>
+<div id="anchored1"></div>
+<div id="scroller1">
+  <div style="height: 100px"></div>
+  <div id="scroller2">
+    <div style="height: 230px"></div>
+    <div id="anchor"></div>
+    <div style="height: 230px"></div>
+  </div>
+  <div style="height: 100px"></div>
+</div>
+
+<script>
+scroller1.scrollTop = 80;
+scroller2.scrollTop = 200;
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-004-ref.html b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-004-ref.html
index 9a47d60cafd..9375e3381a7 100644
--- a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-004-ref.html
+++ b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-chained-004-ref.html
@@ -2,7 +2,6 @@
 <style>
 body {
   margin: 0;
-  height: 700px;
 }
 
 div {
diff --git a/tests/wpt/tests/css/css-backgrounds/parsing/border-image-source-computed.sub.html b/tests/wpt/tests/css/css-backgrounds/parsing/border-image-source-computed.sub.html
index ad48aa987ac..a702b45e0b4 100644
--- a/tests/wpt/tests/css/css-backgrounds/parsing/border-image-source-computed.sub.html
+++ b/tests/wpt/tests/css/css-backgrounds/parsing/border-image-source-computed.sub.html
@@ -21,9 +21,12 @@ test_computed_value("border-image-source", "none");
 test_computed_value("border-image-source", 'url("http://{{host}}/")');
 
 test_computed_value('border-image-source', 'linear-gradient(-45deg, red, currentcolor)', 'linear-gradient(-45deg, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value("border-image-source", 'linear-gradient(45deg, red calc(10% + 5px), blue 90%)', 'linear-gradient(45deg, rgb(255, 0, 0) calc(10% + 5px), rgb(0, 0, 255) 90%)');
 test_computed_value('border-image-source', 'repeating-linear-gradient(-45deg, red, 30%, currentcolor 70%, lime)', 'repeating-linear-gradient(-45deg, rgb(255, 0, 0), 30%, rgb(0, 0, 255) 70%, rgb(0, 255, 0))');
 test_computed_value('border-image-source', 'radial-gradient(10px at 20px 30px, currentcolor, lime)', 'radial-gradient(10px at 20px 30px, rgb(0, 0, 255), rgb(0, 255, 0))');
+test_computed_value("border-image-source", 'radial-gradient(circle at calc(50% * 2 / 4) 40%, red, blue)', 'radial-gradient(circle at 25% 40%, rgb(255, 0, 0), rgb(0, 0, 255))');
 test_computed_value('border-image-source', 'conic-gradient(from 90deg at 80% 90%, lime, black)', 'conic-gradient(from 90deg at 80% 90%, rgb(0, 255, 0), rgb(0, 0, 0))');
+test_computed_value("border-image-source", 'conic-gradient(from 2rad at 50% 50%, red, blue calc(270deg - 20deg))', 'conic-gradient(from 114.592deg, rgb(255, 0, 0), rgb(0, 0, 255) 250deg)');
 
 test(() => {
   const target = document.getElementById('target');
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html
new file mode 100644
index 00000000000..78a236813cd
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-parsing.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<title>CSS Conditional Test: @container scroll-state(direction) query parsing</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<div style="container-name:name;container-type:scroll-state">
+  <main id="cq-main"></main>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  test_cq_condition_known('scroll-state(direction)');
+  test_cq_condition_known('scroll-state(direction: none)');
+  test_cq_condition_known('scroll-state(direction: top)');
+  test_cq_condition_known('scroll-state(direction: left)');
+  test_cq_condition_known('scroll-state(direction: bottom)');
+  test_cq_condition_known('scroll-state(direction: right)');
+  test_cq_condition_known('scroll-state(direction: inline-start)');
+  test_cq_condition_known('scroll-state(direction: inline-end)');
+  test_cq_condition_known('scroll-state(direction: block-start)');
+  test_cq_condition_known('scroll-state(direction: block-end)');
+  test_cq_condition_known('scroll-state(direction: block)');
+  test_cq_condition_known('scroll-state(direction: x)');
+  test_cq_condition_known('scroll-state(direction: y)');
+  test_cq_condition_known('scroll-state(direction: inline)');
+  test_cq_condition_known('(scroll-state(direction: inline-end))');
+  test_cq_condition_known('scroll-state((direction: left))');
+  test_cq_condition_known('scroll-state(not ((direction: bottom) and (direction: right)))');
+  test_cq_condition_known('scroll-state((direction: left) or (direction: top))');
+
+  test_cq_condition_unknown('scroll-state(direction: auto)');
+  test_cq_condition_unknown('scroll-state(direction: true)');
+  test_cq_condition_unknown('scroll-state(style(direction: left))');
+  test_cq_condition_unknown('style(scroll-state(direction: left))');
+  test_cq_condition_unknown('scroll-state(direction:)');
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html
new file mode 100644
index 00000000000..9681d301b93
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/at-container-scroll-direction-serialization.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>CSS Container Queries: scroll-state(direction) conditionText serialization</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">
+<link rel="help" href="https://drafts.csswg.org/cssom/#serialize-a-css-rule">
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style id="testSheet">
+  @container scroll-state(   direction:top   ) { }
+  @container scroll-STate(direction:    ) { }
+  @container scroll-STate(direction) { }
+  @container  scroll-state(  ( direction: LEFT) OR ( direction: BOTTOM  ) ) { }
+  @container scroll-state (direction: right) { }
+</style>
+<script>
+  setup(() => {
+    assert_implements_scroll_state_container_queries();
+    assert_equals(testSheet.sheet.cssRules.length, 5);
+  });
+
+  const tests = [
+      ["scroll-state(direction: top)", "Normalize spaces"],
+      ["scroll-STate(direction:    )", "No value - invalid, serializes as <general-enclosed>"],
+      ["scroll-state(direction)", "Boolean context"],
+      ["scroll-state((direction: left) or (direction: bottom))", "Logical with 'or'"],
+      ["scroll-state (direction: right)", "Not a scroll-state function with space before '('"]
+  ].map((e, i) => [testSheet.sheet.cssRules[i], ...e]);
+
+  tests.forEach((t) => {
+    test(() => assert_equals(t[0].conditionText, t[1]), t[2]);
+  });
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-arrow-key-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-arrow-key-scroll.html
new file mode 100644
index 00000000000..c59b3bfce6e
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-arrow-key-scroll.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) arrow key press scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    const ArrowDown = '\uE015';
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown(ArrowDown)
+      .keyUp(ArrowDown)
+      .send();
+    await new test_driver.Actions()
+      .keyDown(ArrowDown)
+      .keyUp(ArrowDown)
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Arrow key press scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-home-end-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-home-end-scroll.html
new file mode 100644
index 00000000000..4fa386ad65e
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-home-end-scroll.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) Home/End keys press scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<script src="/css/css-transitions/support/helper.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --top: no;
+    --bottom: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: top) {
+      --top: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    const end = "\uE010";
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown(end)
+      .keyUp(end)
+      .send();
+    await new test_driver.Actions()
+      .keyDown(end)
+      .keyUp(end)
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+  }, "End key scroll is an absolute scroll");
+
+  promise_test(async t => {
+    const home = "\uE011";
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown(home)
+      .keyUp(home)
+      .send();
+    await new test_driver.Actions()
+      .keyDown(home)
+      .keyUp(home)
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+  }, "Home key scroll is an absolute scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html
new file mode 100644
index 00000000000..f342875a5b4
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-hv.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) state is persisted across horizontal and vertical scrolling</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<script src="/css/css-transitions/support/helper.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow: scroll;
+  }
+  #filler {
+    height: 600px;
+    width: 600px;
+  }
+  #target {
+    --top: no;
+    --bottom: no;
+    --left: no;
+    --right: no;
+    --none: no;
+    @container scroll-state(direction: top) {
+      --top: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom: yes;
+    }
+    @container scroll-state(direction: left) {
+      --left: yes;
+    }
+    @container scroll-state(direction: right) {
+      --right: yes;
+    }
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+  }, "Check that scroll-state(direction) state before scrolling");
+
+  promise_test(async t => {
+    scroller.scrollBy(300, 0);
+    await waitForAnimationFrames(2);
+    scroller.scrollBy(0, 100);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "yes");
+    assert_equals(scroller.scrollLeft, 300);
+    assert_equals(scroller.scrollTop, 100);
+  }, "Check that scroll-state(direction) horizontal state is persisted across vertical scroll event");
+
+  promise_test(async t => {
+    scroller.scrollBy(0, 100);
+    await waitForAnimationFrames(2);
+    scroller.scrollBy(0, -100);
+    await waitForAnimationFrames(2);
+    scroller.scrollBy(-200, 0);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(scroller.scrollLeft, 100);
+    assert_equals(scroller.scrollTop, 100);
+  }, "Check that scroll-state(direction) vertical state is persisted across horizontal scroll event");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-body.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-body.html
new file mode 100644
index 00000000000..d2fc454f7fb
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-body.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) keyboard scroll on body</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+html {
+  overflow: scroll;
+}
+
+body {
+  container-type: scroll-state;
+  overflow-y: scroll;
+}
+
+body {
+  height: 300px;
+}
+
+div {
+  height: 1000px;
+  --y: no;
+}
+
+@container scroll-state(direction: y) {
+  div {
+    --y: yes;
+  }
+}
+</style>
+<body>
+<div id="target"></div>
+</body>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    await new test_driver.Actions()
+      .addPointer("TestPointer", "mouse")
+      .pointerMove(100, 100)
+      .pointerDown()
+      .pointerUp()
+      .send();
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Spacebar scroll on body");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-root.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-root.html
new file mode 100644
index 00000000000..71836111760
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-keyboard-scroll-on-root.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) keyboard scroll on root element</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  html {
+      container-type: scroll-state;
+  }
+
+  body {
+      min-height: 200vh;
+  }
+
+  div {
+    --y: no;
+  }
+
+  @container scroll-state(direction: y) {
+    div {
+      --y: yes;
+    }
+  }
+</style>
+<body>
+<div id="target"></div>
+</body>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+  }, "Spacebar scroll on root");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-mouse-drag-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-mouse-drag-scroll.html
new file mode 100644
index 00000000000..bb7777a41dd
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-mouse-drag-scroll.html
@@ -0,0 +1,106 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) user mouse drag scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow: scroll;
+  }
+  #filler {
+    height: 600px;
+    width: 600px;
+  }
+  #target {
+    --none: no;
+    --x: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+    @container scroll-state(direction: x) {
+      --x: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function drag_scrollbar(start_pos, end_pos) {
+    return new test_driver.Actions()
+        .addPointer("TestPointer", "mouse")
+        .pointerMove(Math.round(start_pos.x), Math.round(start_pos.y))
+        .pointerDown()
+        .addTick(100)
+        .pointerMove(Math.round(end_pos.x), Math.round(end_pos.y))
+        .pointerUp()
+        .send();
+  }
+
+  promise_test(async t => {
+    // Skip test on platforms that do not have a visible scrollbar (e.g.
+    // overlay scrollbar).
+    const scrollbar_width = scroller.offsetWidth - scroller.clientWidth;
+    if (scrollbar_width == 0) {
+      return;
+    }
+    assert_equals(scroller.scrollTop, 0);
+
+    // Vertical scrollbar position top right
+    const start_pos = {
+      x: 200,
+      y: 30,
+    };
+    const end_pos = { x: 200, y: 200 };
+
+    await drag_scrollbar(start_pos, end_pos);
+    await waitForAnimationFrames(2);
+
+    assert_not_equals(scroller.scrollTop, 0);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+  }, "Vertical scrollbar drag scroll");
+
+  promise_test(async t => {
+    // Skip test on platforms that do not have a visible scrollbar (e.g.
+    // overlay scrollbar).
+    const scrollbar_height = scroller.offsetHeight - scroller.clientHeight;
+    if (scrollbar_height == 0) {
+      return;
+    }
+    assert_equals(scroller.scrollLeft, 0);
+
+    // Horizontal scrollbar position bottom left
+    const start_pos = {
+      x: 30,
+      y: 200,
+    };
+    const end_pos = { x: 200, y: 200 };
+
+    await drag_scrollbar(start_pos, end_pos);
+    await waitForAnimationFrames(2);
+
+    assert_not_equals(scroller.scrollLeft, 0);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+
+  }, "Horizontal scrollbar drag scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-multiple-scrollers.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-multiple-scrollers.html
new file mode 100644
index 00000000000..8b075e40617
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-multiple-scrollers.html
@@ -0,0 +1,98 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) multiple scrollers</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/dom/events/scrolling/scroll_support.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  .scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  .filler {
+    height: 600px;
+  }
+  .target {
+    --top1: no;
+    --top2: no;
+    --bottom1: no;
+    --bottom2: no;
+  }
+  #target1 {
+    @container scroll-state(direction: top) {
+      --top1: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom1: yes;
+    }
+  }
+  #target2 {
+    @container scroll-state(direction: top) {
+      --top2: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom2: yes;
+    }
+  }
+</style>
+<div id="scroller1" class="scroller">
+  <div class="filler">
+    <div id="target1" class="target"></div>
+  </div>
+</div>
+<div id="scroller2" class="scroller">
+  <div class="filler">
+    <div id="target2" class="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function touch_scroll(start_pos, end_pos) {
+    return new test_driver.Actions()
+        .addPointer("TestPointer", "touch")
+        .pointerMove(Math.round(start_pos.x), Math.round(start_pos.y))
+        .pointerDown()
+        .addTick()
+        .pause(200)
+        .pointerMove(Math.round(end_pos.x), Math.round(end_pos.y))
+        .addTick()
+        .pointerUp()
+        .send();
+  }
+
+  promise_test(async t => {
+    let scrollEndPromise1 = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller1);
+    let scrollEndPromise2 = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller2);
+
+    scroller1.addEventListener('scroll', () => {
+      scroller2.scrollTop = 300;
+      scroller2.scrollBy({top: -150, behavior: "smooth"});
+    }, { once: true });
+
+    // Scroll element position
+    const start = {
+      x: 100,
+      y: 100,
+    };
+    const end = { x: 100, y: 0 };
+    await touch_scroll(start, end);
+
+    await Promise.all([scrollEndPromise1, scrollEndPromise2]);
+    await waitForAnimationFrames(2);
+
+    assert_equals(getComputedStyle(target1).getPropertyValue("--top1"), "no");
+    assert_equals(getComputedStyle(target1).getPropertyValue("--bottom1"), "yes");
+    assert_equals(scroller2.scrollTop, 150);
+    assert_equals(getComputedStyle(target2).getPropertyValue("--top2"), "yes");
+    assert_equals(getComputedStyle(target2).getPropertyValue("--bottom2"), "no");
+  }, "User scroll caused programmatic relative scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html
new file mode 100644
index 00000000000..110ef90034a
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-absolute-scrolls.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) ignores absolute scrolls</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<script src="/css/css-transitions/support/helper.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-x: scroll;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+    width: 600px;
+  }
+  #target {
+    --top: no;
+    --bottom: no;
+    --y: no;
+    --left: no;
+    --right: no;
+    --x: no;
+    --none: no;
+    @container scroll-state(direction: top) {
+      --top: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+    @container scroll-state(direction: left) {
+      --left: yes;
+    }
+    @container scroll-state(direction: right) {
+      --right: yes;
+    }
+    @container scroll-state(direction: x) {
+      --x: yes;
+    }
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+  }, "Check that scroll-state(direction) state before scrolling");
+
+  promise_test(async t => {
+    scroller.scrollTop = 300;
+    scroller.scrollLeft = 300;
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+    assert_equals(scroller.scrollTop, 300);
+    assert_equals(scroller.scrollLeft, 300);
+  }, "scrollTop and scrollLeft scrolls should not affect scroll-state(direction)");
+
+  promise_test(async t => {
+    scroller.scrollTo(0, 100);
+    scroller.scrollTo(100, 0);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+  }, "scrollTo scrolls should not affect scroll-state(direction)");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html
new file mode 100644
index 00000000000..1ca314d6d8e
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-programmatic-relative-scrolls.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) changed after scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<script src="/css/css-transitions/support/helper.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-x: scroll;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+    width: 600px;
+  }
+  #target {
+    --top: no;
+    --bottom: no;
+    --y: no;
+    --left: no;
+    --right: no;
+    --x: no;
+    --none: no;
+    @container scroll-state(direction: top) {
+      --top: yes;
+    }
+    @container scroll-state(direction: bottom) {
+      --bottom: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+    @container scroll-state(direction: left) {
+      --left: yes;
+    }
+    @container scroll-state(direction: right) {
+      --right: yes;
+    }
+    @container scroll-state(direction: x) {
+      --x: yes;
+    }
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+  }, "Check that scroll-state(direction) state before scrolling");
+
+  promise_test(async t => {
+    scroller.scrollBy(0, -100);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+  }, "Scrolling up when scrollbar is on the top should not change  scroll-state(direction)");
+
+  promise_test(async t => {
+    scroller.scrollTop = 200;
+    scroller.scrollBy(0, -100, "instant");
+    scroller.scrollTop = 0;
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "no");
+
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "no");
+  }, "Relative scroll followed by absolute scroll should change scroll direction");
+
+  promise_test(async t => {
+    scroller.scrollBy(0, 300);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+    assert_equals(scroller.scrollTop, 300);
+  }, "scroll-state(direction) after scrolling bottom");
+
+  promise_test(async t => {
+    scroller.scrollBy(0, -200);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--bottom"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+    assert_equals(scroller.scrollTop, 100);
+  }, "scroll-state(direction) after scrolling top");
+
+  promise_test(async t => {
+    scroller.scrollBy(300, 0);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "yes");
+    assert_equals(scroller.scrollLeft, 300);
+  }, "scroll-state(direction) after scrolling right");
+
+  promise_test(async t => {
+    scroller.scrollBy(-200, 0);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--left"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--right"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--x"), "yes");
+    assert_equals(scroller.scrollLeft, 100);
+  }, "scroll-state(direction) after scrolling left");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-pu-pd-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-pu-pd-scroll.html
new file mode 100644
index 00000000000..3f8af189b39
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-pu-pd-scroll.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) PageUp/PageDown keys press scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --top: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: top) {
+      --top: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    const PageUp = '\uE00E';
+    const PageDown = '\uE00F';
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown(PageUp)
+      .keyUp(PageUp)
+      .send();
+    await new test_driver.Actions()
+      .keyDown(PageUp)
+      .keyUp(PageUp)
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "no");
+
+  }, "PageUp key shouldn't scroll when scroller is already on top");
+
+  promise_test(async t => {
+    const PageUp = '\uE00E';
+    const PageDown = '\uE00F';
+    scroller.scrollTop = 100;
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown(PageUp)
+      .keyUp(PageUp)
+      .send();
+    await new test_driver.Actions()
+      .keyDown(PageUp)
+      .keyUp(PageUp)
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--top"), "yes");
+
+  }, "PageUp key scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-button-clicks.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-button-clicks.html
new file mode 100644
index 00000000000..ef3f3486028
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-button-clicks.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) user mouse drag scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function scrollbar_track_click(track_position) {
+    return new test_driver.Actions()
+        .addPointer("TestPointer", "mouse")
+        .pointerMove(Math.round(track_position.x), Math.round(track_position.y))
+        .pointerDown()
+        .pointerUp()
+        .send();
+  }
+
+  promise_test(async t => {
+    /* Scrollbar down button should be located on bottom right side */
+    const track_position = { x: 200, y: 200 };
+    await scrollbar_track_click(track_position);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Scrollbar button clicks scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-track-clicks.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-track-clicks.html
new file mode 100644
index 00000000000..12cc38ca7af
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-scrollbar-track-clicks.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) scrollbar track click scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function scrollbar_track_click(track_position) {
+    return new test_driver.Actions()
+        .addPointer("TestPointer", "mouse")
+        .pointerMove(Math.round(track_position.x), Math.round(track_position.y))
+        .pointerDown()
+        .pointerUp()
+        .send();
+  }
+
+  promise_test(async t => {
+    /* Scrollbar should be located on top right side */
+    const track_position = { x: 200, y: 150 };
+    await scrollbar_track_click(track_position);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Scrollbar track click scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-spacebar-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-spacebar-scroll.html
new file mode 100644
index 00000000000..b47974d7439
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-spacebar-scroll.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) spacebar click scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "yes");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+    scroller.focus();
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await new test_driver.Actions()
+      .keyDown('\uE00D')
+      .keyUp('\uE00D')
+      .send();
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--none"), "no");
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Spacebar scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-user-touch-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-user-touch-scroll.html
new file mode 100644
index 00000000000..0ced84e8021
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-user-touch-scroll.html
@@ -0,0 +1,81 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) user touch scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --none: no;
+    --y: no;
+    @container scroll-state(direction: none) {
+      --none: yes;
+    }
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function touch_scroll(start_pos, end_pos, duration) {
+    return new test_driver.Actions()
+        .addPointer("TestPointer", "touch")
+        .pointerMove(Math.round(start_pos.x), Math.round(start_pos.y))
+        .pointerDown()
+        .addTick()
+        .pause(200)
+        .pointerMove(Math.round(end_pos.x), Math.round(end_pos.y), {duration: duration})
+        .addTick()
+        .pointerUp()
+        .send();
+  }
+
+  promise_test(async t => {
+    // Scrollbar element position
+    const start_pos = {
+      x: 100,
+      y: 100,
+    };
+    const end_pos = { x: 100, y: 0 };
+
+    await touch_scroll(start_pos, end_pos, 1000);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "no");
+
+  }, "Panning gesture scroll is an absolute scroll");
+
+  promise_test(async t => {
+    // Scrollbar element position
+    const start_pos = {
+      x: 100,
+      y: 100,
+    };
+    const end_pos = { x: 100, y: 0 };
+
+    await touch_scroll(start_pos, end_pos, 10);
+    await waitForAnimationFrames(2);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+
+  }, "Fling gesture scroll is a relative scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wheel-scroll.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wheel-scroll.html
new file mode 100644
index 00000000000..7b37ef7cf60
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wheel-scroll.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(direction) mouse wheel scroll</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="/dom/events/scrolling/scroll_support.js"></script>
+<script src="/css/css-scroll-snap/support/common.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #scroller {
+    width: 200px;
+    height: 200px;
+    container-type: scroll-state;
+    overflow-y: scroll;
+  }
+  #filler {
+    height: 600px;
+  }
+  #target {
+    --y: no;
+    @container scroll-state(direction: y) {
+      --y: yes;
+    }
+  }
+</style>
+<div id="scroller">
+  <div id="filler">
+    <div id="target"></div>
+  </div>
+</div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  promise_test(async t => {
+    let scrollEndPromise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
+    await new test_driver.Actions()
+          .scroll(0, 0, 0, 100, { origin: scroller, duration: 100 })
+          .send();
+    await scrollEndPromise;
+    await waitForAnimationFrames(2);
+    assert_equals(scroller.scrollTop, 100);
+    assert_equals(getComputedStyle(target).getPropertyValue("--y"), "yes");
+  }, "Mouse wheel scroll");
+
+</script>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html
new file mode 100644
index 00000000000..83f496fb088
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/scroll-state/scroll-direction-wm.html
@@ -0,0 +1,150 @@
+<!DOCTYPE html>
+<title>@container: scroll-state(scroll-state) matching for writing direction</title>
+<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#direction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<script src="/css/css-transitions/support/helper.js"></script>
+<style>
+  .direction {
+    container-type: scroll-state;
+    width: 100px;
+    height: 100px;
+    overflow: scroll;
+  }
+  .filler {
+    height: 600px;
+    width: 600px;
+  }
+  .target {
+    @container scroll-state(direction: block-start) { --block-start: yes }
+    @container scroll-state(direction: block-end) { --block-end: yes }
+    @container scroll-state(direction: inline-start) { --inline-start: yes }
+    @container scroll-state(direction: inline-end) { --inline-end: yes }
+    @container scroll-state(direction: top) { --top: yes }
+    @container scroll-state(direction: left) { --left: yes }
+    @container scroll-state(direction: bottom) { --bottom: yes }
+    @container scroll-state(direction: right) { --right: yes }
+  }
+  .ltr { direction: ltr; }
+  .rtl { direction: rtl; }
+  .htb { writing-mode: horizontal-tb; }
+  .vlr { writing-mode: vertical-lr; }
+  .vrl { writing-mode: vertical-rl; }
+</style>
+<div class="direction h htb ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction h htb rtl"><div class="filler"><span class="target"></span></div></div>
+<div class="direction h vlr ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction h vlr rtl"><div class="filler"><span class="target"></span></div></div>
+<div class="direction h vrl ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction h vrl rtl"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v htb ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v htb rtl"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v vlr ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v vlr rtl"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v vrl ltr"><div class="filler"><span class="target"></span></div></div>
+<div class="direction v vrl rtl"><div class="filler"><span class="target"></span></div></div>
+<script>
+  setup(() => assert_implements_scroll_state_container_queries());
+
+  function match_scroll_direction(container_selector, expected_matches) {
+    let scroller = document.querySelector(container_selector + " .target");
+    let style = getComputedStyle(scroller);
+    for (let custom_prop of [ "--block-start",
+                              "--block-end",
+                              "--inline-start",
+                              "--inline-end",
+                              "--top",
+                              "--left",
+                              "--bottom",
+                              "--right" ]) {
+      assert_equals(style.getPropertyValue(custom_prop) === "yes",
+                    expected_matches[custom_prop] === true, custom_prop);
+    }
+  }
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.htb.ltr");
+    scroller.scrollBy(150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.htb.ltr", { "--inline-end": true, "--right": true });
+  }, "scroll-state(direction) horizontal scrollbar horizontal-tb/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.htb.rtl");
+    scroller.scrollBy(-150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.htb.rtl", { "--inline-end": true, "--left": true });
+  }, "scroll-state(direction) horizontal scrollbar horizontal-tb/rtl");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.vlr.ltr");
+    scroller.scrollBy(150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.vlr.ltr", { "--block-end": true, "--right": true });
+  }, "scroll-state(direction) horizontal scrollbar vertical-lr/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.vlr.rtl");
+    scroller.scrollBy(150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.vlr.rtl", { "--block-end": true, "--right": true });
+  }, "scroll-state(direction) horizontal scrollbar vertical-lr/rtl");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.vrl.ltr");
+    scroller.scrollBy(-150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.vrl.ltr", { "--block-end": true, "--left": true });
+  }, "scroll-state(direction) horizontal scrollbar vertical-rl/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.h.vrl.rtl");
+    scroller.scrollBy(-150, 0);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.h.vrl.rtl", { "--block-end": true, "--left": true });
+  }, "scroll-state(direction) horizontal scrollbar vertical-rl/rtl");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.htb.ltr");
+    scroller.scrollBy(0, 150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.htb.ltr", { "--block-end": true, "--bottom": true });
+  }, "scroll-state(direction) vertical scrollbar horizontal-tb/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.htb.rtl");
+    scroller.scrollBy(0, 150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.htb.rtl", { "--block-end": true, "--bottom": true });
+  }, "scroll-state(direction) vertical scrollbar horizontal-tb/rtl");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.vlr.ltr");
+    scroller.scrollBy(0, 150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.vlr.ltr", { "--inline-end": true, "--bottom": true });
+  }, "scroll-state(direction) vertical scrollbar vertical-lr/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.vlr.rtl");
+    scroller.scrollBy(0, -150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.vlr.rtl", { "--inline-end": true, "--top": true });
+  }, "scroll-state(direction) vertical scrollbar vertical-lr/rtl");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.vrl.ltr");
+    scroller.scrollBy(0, 150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.vrl.ltr", { "--inline-end": true, "--bottom": true });
+  }, "scroll-state(direction) vertical scrollbar vertical-rl/ltr");
+
+  promise_test(async t => {
+    let scroller = document.querySelector(".direction.v.vrl.rtl");
+    scroller.scrollBy(0, -150);
+    await waitForAnimationFrames(2);
+    match_scroll_direction(".direction.v.vrl.rtl", { "--inline-end": true, "--top": true });
+  }, "scroll-state(direction) vertical scrollbar vertical-rl/rtl");
+
+</script>
diff --git a/tests/wpt/tests/css/css-content/parsing/content-computed.html b/tests/wpt/tests/css/css-content/parsing/content-computed.html
index 61c1ec56353..68bbf06c177 100644
--- a/tests/wpt/tests/css/css-content/parsing/content-computed.html
+++ b/tests/wpt/tests/css/css-content/parsing/content-computed.html
@@ -45,6 +45,11 @@ test_computed_value_combinations("content", `counters(counter-name, ".") "potato
 test_computed_value_combinations("content", `"(" counters(counter-name, ".", counter-style) ")"`);
 test_computed_value_combinations("content", `open-quote "hello" "world" close-quote`);
 test_computed_value_combinations("content", `url("https://www.example.com/picture.svg") "hello"`);
+
+test_computed_value("content", "linear-gradient(to top right, red calc(10% + 2em), blue", "linear-gradient(to right top, rgb(255, 0, 0) calc(10% + 32px), rgb(0, 0, 255))");
+test_computed_value("content", "radial-gradient(ellipse 50% 40% at calc(2em + 10px) 30%, red, blue)", "radial-gradient(50% 40% at 42px 30%, rgb(255, 0, 0), rgb(0, 0, 255))");
+test_computed_value("content", "conic-gradient(from 1.5708rad, red 0deg, blue calc(180deg - 10deg))", "conic-gradient(from 90.0002deg, rgb(255, 0, 0) 0deg, rgb(0, 0, 255) 170deg)");
+
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-001.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-001.xhtml
index a32ed619c88..2267d67c244 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-001.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-001.xhtml
@@ -12,7 +12,7 @@
     <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"/>
     <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-items-property"/>
     <link rel="match" href="flexbox-align-self-vert-rtl-001-ref.xhtml"/>
-    <meta name="fuzzy" content="maxDifference=0-60;totalPixels=0-101"/>
+    <meta name="fuzzy" content="maxDifference=0-120;totalPixels=0-101"/>
     <style>
       .flexbox {
         border: 1px solid blue;
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-002.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-002.xhtml
index a3a81e25d10..614e32f0833 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-002.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-align-self-vert-rtl-002.xhtml
@@ -13,6 +13,7 @@
     <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"/>
     <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-items-property"/>
     <link rel="match" href="flexbox-align-self-vert-rtl-002-ref.xhtml"/>
+    <meta name="fuzzy" content="maxDifference=0-120;totalPixels=0-101"/>
     <style>
       .flexbox {
         border: 1px dashed blue;
diff --git a/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-003.html b/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-003.html
index 7777b50dc64..33e00d24a07 100644
--- a/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-003.html
+++ b/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-003.html
@@ -18,7 +18,7 @@
         var animation = target.animate([{}, {rowRuleWidth: 'repeat(2, 40px 40px) repeat(1, 40px)'}], 1000);
         animation.pause();
         animation.currentTime = 500;
-        assert_equals(getComputedStyle(target).rowRuleWidth, 'repeat(2, 30px 30px) repeat(1, 35px)');
+        assert_equals(getComputedStyle(target).rowRuleWidth, '30px 30px 30px 30px 35px');
       }, 'gap decorations row-rule-width with repeaters supports neutral keyframe.');
     </script>
   </body>
diff --git a/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-004.html b/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-004.html
index 85c059d3fce..5453b09ff35 100644
--- a/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-004.html
+++ b/tests/wpt/tests/css/css-gaps/animation/gap-decorations-width-neutral-keyframe-004.html
@@ -18,7 +18,7 @@
         var animation = target.animate([{}, {columnRuleWidth: 'repeat(2, 40px 40px) 40px 40px'}], 1000);
         animation.pause();
         animation.currentTime = 500;
-        assert_equals(getComputedStyle(target).columnRuleWidth, 'repeat(2, 30px 30px) 35px 35px');
+        assert_equals(getComputedStyle(target).columnRuleWidth, '30px 30px 30px 30px 35px 35px');
       }, 'gap decorations column-rule-width with repeaters supports neutral keyframe.');
     </script>
   </body>
diff --git a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-001.html b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-001.html
index 041a1b168e8..b802bb4c597 100644
--- a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-001.html
+++ b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-001.html
@@ -11,9 +11,9 @@
     #target {
       column-rule-width: 10px;
       column-rule-style: solid;
-      animation: color-anim 2s linear paused;
+      animation: width-anim 2s linear paused;
     }
-    @keyframes color-anim {
+    @keyframes width-anim {
       from { column-rule-width: 0px; }
     }
   </style>
@@ -37,12 +37,12 @@
         '5px' // The width at 50% of the animation.
       );
 
-      el.style.columnRuleWidth = 'repeat(2, 10px)';
+      el.style.columnRuleWidth = 'repeat(auto, 10px)';
 
       const snapped = getComputedStyle(el).columnRuleWidth;
       assert_equals(
         snapped,
-        'repeat(2, 10px)'
+        'repeat(auto, 10px)'
       );
     });
   </script>
diff --git a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-002.html b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-002.html
index 994b7098b60..7481fc6fe0c 100644
--- a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-002.html
+++ b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-conversion-002.html
@@ -11,10 +11,10 @@
     #target {
       column-rule-width: 10px 10px;
       column-rule-style: solid;
-      animation: color-anim 2s linear paused;
+      animation: width-anim 2s linear paused;
     }
-    @keyframes color-anim {
-      from { column-rule-width: 0px; }
+    @keyframes width-anim {
+      from { column-rule-width: 0px repeat(auto, 0px); }
     }
   </style>
 </head>
@@ -26,7 +26,7 @@
       const el = document.getElementById('target');
       const anim = el.getAnimations()[0];
 
-      assert_equals(getComputedStyle(el).columnRuleWidth, '0px');
+      assert_equals(getComputedStyle(el).columnRuleWidth, '0px repeat(auto, 0px)');
 
       // Jump to 50% of the animation.
       anim.currentTime = anim.effect.getComputedTiming().duration / 2;
@@ -37,11 +37,11 @@
         '10px 10px'
       );
 
-      el.style.columnRuleWidth = '10px';
+      el.style.columnRuleWidth = '10px repeat(auto, 10px)';
       const intermediate = getComputedStyle(el).columnRuleWidth;
       assert_equals(
         intermediate,
-        '5px'
+        '5px repeat(auto, 5px)'
       );
 
     });
diff --git a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-repeaters.html b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-repeaters.html
index 9f13ef425d9..40bb557649f 100644
--- a/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-repeaters.html
+++ b/tests/wpt/tests/css/css-gaps/animation/rule-width-interpolation-repeaters.html
@@ -30,30 +30,33 @@
 <body>
     <script>
         // Valid Interpolations:
+        // Repeaters should expand.
         test_interpolation({
             property: 'row-rule-width',
             from: neutralKeyframe,
             to: '20px repeat(2, 30px 30px) 30px',
         }, [
-            { at: -0.3, expect: '7px repeat(2, 17px 17px) 17px' },
-            { at: 0, expect: '10px repeat(2, 20px 20px) 20px' },
-            { at: 0.3, expect: '13px repeat(2, 23px 23px) 23px' },
-            { at: 0.6, expect: '16px repeat(2, 26px 26px) 26px' },
-            { at: 1, expect: '20px repeat(2, 30px 30px) 30px' },
-            { at: 1.5, expect: '25px repeat(2, 35px 35px) 35px' },
+            { at: -0.3, expect: '7px 17px 17px 17px 17px 17px' },
+            { at: 0, expect: '10px 20px 20px 20px 20px 20px' },
+            { at: 0.3, expect: '13px 23px 23px 23px 23px 23px' },
+            { at: 0.6, expect: '16px 26px 26px 26px 26px 26px' },
+            { at: 1, expect: '20px 30px 30px 30px 30px 30px' },
+            { at: 1.5, expect: '25px 35px 35px 35px 35px 35px' },
         ]);
         test_interpolation({
             property: 'column-rule-width',
             from: neutralKeyframe,
             to: 'repeat(2, 30px 30px)',
         }, [
-            { at: -0.3, expect: 'repeat(2, 17px 17px)' },
-            { at: 0, expect: 'repeat(2, 20px 20px)' },
-            { at: 0.3, expect: 'repeat(2, 23px 23px)' },
-            { at: 0.6, expect: 'repeat(2, 26px 26px)' },
-            { at: 1, expect: 'repeat(2, 30px 30px)' },
-            { at: 1.5, expect: 'repeat(2, 35px 35px)' },
+            { at: -0.3, expect: '17px 17px 17px 17px' },
+            { at: 0, expect: '20px 20px 20px 20px' },
+            { at: 0.3, expect: '23px 23px 23px 23px' },
+            { at: 0.6, expect: '26px 26px 26px 26px' },
+            { at: 1, expect: '30px 30px 30px 30px' },
+            { at: 1.5, expect: '35px 35px 35px 35px' },
         ]);
+
+        // Auto repeaters don't expand.
         test_interpolation({
             property: 'column-rule-width',
             from: 'repeat(auto, 20px 20px)',
@@ -67,55 +70,79 @@
             { at: 1.5, expect: 'repeat(auto, 35px 35px)' },
         ]);
 
-        // Shouldn't interpolate, length of the list is different:
+        // Auto repeaters should interpolate, we apply
+        // lowest common multiple interpolation to the inner values
+        // of auto repeaters.
+        test_interpolation({
+          property: 'column-rule-width',
+          from: 'repeat(auto, 20px)',
+          to: 'repeat(auto, 30px 30px)',
+        }, [
+          { at: -0.3, expect: 'repeat(auto, 17px 17px)' },
+          { at: 0, expect: 'repeat(auto, 20px 20px)' },
+          { at: 0.3, expect: 'repeat(auto, 23px 23px)' },
+          { at: 0.6, expect: 'repeat(auto, 26px 26px)' },
+          { at: 1, expect: 'repeat(auto, 30px 30px)' },
+          { at: 1.5, expect: 'repeat(auto, 35px 35px)' },
+        ]);
+
+        // Repeaters should expand.
+        test_interpolation({
+          property: 'column-rule-width',
+          from: 'repeat(1, 20px)',
+          to: 'repeat(2, 30px 30px)',
+        }, [
+          { at: -0.3, expect: '17px 17px 17px 17px' },
+          { at: 0, expect: '20px 20px 20px 20px' },
+          { at: 0.3, expect: '23px 23px 23px 23px' },
+          { at: 0.6, expect: '26px 26px 26px 26px' },
+          { at: 1, expect: '30px 30px 30px 30px' },
+          { at: 1.5, expect: '35px 35px 35px 35px' },
+        ]);
+
+        // Repeaters should expand and interpolate with non repeaters.
+        test_interpolation({
+          property: 'column-rule-width',
+          from: 'repeat(2, 20px)',
+          to: '30px',
+        }, [
+          { at: -0.3, expect: '17px 17px' },
+          { at: 0, expect: '20px 20px' },
+          { at: 0.3, expect: '23px 23px' },
+          { at: 0.6, expect: '26px 26px' },
+          { at: 1, expect: '30px 30px' },
+          { at: 1.5, expect: '35px 35px' },
+        ]);
+
+        // When auto repeaters are present, we only interpolate if the length
+        // of the `leading` segments match, and the length of the `trailing`
+        // segments match.
+        test_interpolation({
+          property: 'column-rule-width',
+          from: 'repeat(2, 20px) repeat(auto, 20px) 20px',
+          to: '30px 30px repeat(auto, 30px) 30px',
+        }, [
+          { at: -0.3, expect: '17px 17px repeat(auto, 17px) 17px' },
+          { at: 0, expect: '20px 20px repeat(auto, 20px) 20px' },
+          { at: 0.3, expect: '23px 23px repeat(auto, 23px) 23px' },
+          { at: 0.6, expect: '26px 26px repeat(auto, 26px) 26px' },
+          { at: 1, expect: '30px 30px repeat(auto, 30px) 30px' },
+          { at: 1.5, expect: '35px 35px repeat(auto, 35px) 35px' },
+        ]);
+
+        // Invalid interpolations:
+        // Shouldn't interpolate, different leading lengths with present auto repeater:
         test_no_interpolation({
-            property: 'row-rule-width',
-            from: neutralKeyframe,
-            to: 'repeat(2, 30px 30px) 30px',
-        });
-        test_no_interpolation({
-            property: 'row-rule-width',
-            from: neutralKeyframe,
-            to: 'repeat(2, 30px 30px) repeat(2, 30px 30px)',
+          property: 'column-rule-width',
+          from: '20px repeat(auto, 20px)',
+          to: '30px 30px repeat(auto, 30px)',
         });
 
-        // Shouldn't interpolate, repeaters are not compatible:
+        // Shouldn't interpolate, different trailing lengths with present auto repeater:
         test_no_interpolation({
-            property: 'column-rule-width',
-            from: neutralKeyframe,
-            to: 'repeat(3, 30px 30px)',
-        });
-        test_no_interpolation({
-            property: 'column-rule-width',
-            from: neutralKeyframe,
-            to: 'repeat(2, 30px 30px 30px)',
-        });
-        test_no_interpolation({
-            property: 'row-rule-width',
-            from: neutralKeyframe,
-            to: '20px repeat(3, 30px 30px) 30px',
-        });
-        test_no_interpolation({
-            property: 'row-rule-width',
-            from: neutralKeyframe,
-            to: '20px repeat(2, 30px 30px 30px) 30px',
-        });
-        test_no_interpolation({
-            property: 'column-rule-width',
-            from: 'repeat(auto, 20px 20px)',
-            to: 'repeat(3, 30px 30px)',
-        });
-        test_no_interpolation({
-            property: 'column-rule-width',
-            from: 'repeat(auto, 20px 20px)',
-            to: 'repeat(auto, 30px 30px 30px)',
-        });
-
-        // Shouldn't interpolate, repeater and a length are not compatible:
-        test_no_interpolation({
-            property: 'column-rule-width',
-            from: neutralKeyframe,
-            to: '30px',
+          property: 'column-rule-width',
+          from: '20px repeat(auto, 20px)',
+          to: '30px repeat(auto, 30px) 30px',
         });
     </script>
 </body>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html
new file mode 100644
index 00000000000..41a479196a8
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-001.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap that
+  is split across a fragmentainer break.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    position: relative;
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+    column-gap: 0px;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 80px);
+    row-gap: 30px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+  .abspos {
+    background: green;
+    position: absolute;
+    width: 66.66px;
+    height: 20px;
+    left: 0;
+    top: 80px;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+  </div>
+  <!-- Abspos element to cover 20px empty space left by split gaps at the bottom of the first two fragmentainers -->
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html
new file mode 100644
index 00000000000..d36bcf459d5
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-002.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap that
+  takes up an entire fragmentainer.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 100px);
+    row-gap: 100px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+ </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html
new file mode 100644
index 00000000000..6de4c188cbf
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-003.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap
+  that takes up multiple fragmentainers.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 100px);
+    row-gap: 200px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+ </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html
new file mode 100644
index 00000000000..a0b10cbcbb0
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-004.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap
+  that is the last item in a fragmentainer.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    position: relative;
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+    column-gap: 0px;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 90px);
+    row-gap: 10px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+  .abspos {
+    background: green;
+    position: absolute;
+    width: 66.66px;
+    height: 10px;
+    left: 0;
+    top: 90px;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+  </div>
+  <!-- Abspos element to cover `0px empty space left by split gaps at the bottom of the first two fragmentainers -->
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html
new file mode 100644
index 00000000000..52ee98a6310
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-005.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap
+  that is mainly in the subsequent fragmentainer.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    position: relative;
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+    column-gap: 0px;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 98px);
+    row-gap: 20px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+  .abspos {
+    background: green;
+    position: absolute;
+    width: 66.66px;
+    height: 2px;
+    left: 0;
+    top: 98px;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <!-- Abspos element to cover 2px empty space left by split gaps at the bottom of the first two fragmentainers -->
+    <div class="abspos"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html
new file mode 100644
index 00000000000..312e0bf01e9
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-006.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap that
+  starts at the top of the fragmentainer.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 100px);
+    row-gap: 20px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+ </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html
new file mode 100644
index 00000000000..5e6fc53ac74
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-007.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<title>
+  Suppress row grid gaps: row gaps should be suppressed if it's split across
+  fragmentainer breaks or is the last content before a break. Tests a row gap that
+  is mainly in the preceeding fragmentainer.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="../../../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  .multicol {
+    position: relative;
+    columns: 3;
+    column-fill: auto;
+    width: 100px;
+    height: 100px;
+    background: green;
+    column-gap: 0px;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-rows: repeat(3, 80px);
+    row-gap: 23px;
+    background: red;
+    row-rule: solid;
+  }
+  .grid-item {
+    background: green;
+  }
+  .abspos {
+    background: green;
+    position: absolute;
+    width: 66.66px;
+    height: 20px;
+    left: 0;
+    top: 80px;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="multicol">
+  <div class="grid-container">
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+    <div class="grid-item"></div>
+  </div>
+  <!-- Abspos element to cover 20px empty space left by split gaps at the bottom of the first two fragmentainers -->
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008-ref.html
new file mode 100644
index 00000000000..19d9c377439
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008-ref.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    /* Simulate row gaps with row tracks */
+    grid-template-rows: repeat(2, 50px 20px) 50px 10px 50px;
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 100px;
+    width: 6px;
+  }
+  .row-gap {
+    position: absolute;
+    background: red;
+    height: 10px;
+    width: 100px;
+  }
+</style>
+<div class="multi-col">
+<div class="grid-container">
+<div></div>
+<div></div>
+<div style="grid-column: 1/3; background: lightgray;"></div>
+<div></div>
+<div></div>
+<div style="grid-column: 1/3;  background: lightgray;"></div>
+<div></div>
+<div></div>
+<div style="grid-column: 1/3; background: lightgray;"></div>
+<div></div>
+<div></div>
+</div>
+<div class="column-gap" style="left: 47px; top: 0px;"></div>
+<div class="column-gap" style="left: 157px; top: 0px;"></div>
+<div class="column-gap" style="left: 267px; top: 0px; height: 50px;"></div>
+<div class="row-gap" style="left: 0px; top: 55px;"></div>
+<div class="row-gap" style="left: 110px; top: 25px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html
new file mode 100644
index 00000000000..763ebc14463
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-008.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in a grid that's fragmented. Suppressed row gaps do not have decorations.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-008-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 50px);
+    column-gap: 10px;
+    row-gap: 20px;
+    row-rule: solid 10px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009-ref.html
new file mode 100644
index 00000000000..8f6d829d557
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009-ref.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 90px 10px);
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .simulated-row-gap {
+    grid-column: 1/3;
+    background-color: lightgray !important;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 100px;
+    width: 6px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="column-gap" style="left: 47px; top: 0px;"></div>
+  <div class="column-gap" style="left: 157px; top: 0px;"></div>
+  <div class="column-gap" style="left: 267px; top: 0px;"></div>
+  <div class="column-gap" style="left: 377px; top: 0px; height: 90px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html
new file mode 100644
index 00000000000..99f9297a046
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-009.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in a grid that's fragmented. Suppressed row gaps do not have decorations.
+  Tests scenario where all row gaps are suppressed.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-009-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 90px);
+    column-gap: 10px;
+    row-gap: 20px;
+    row-rule: solid 10px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010-ref.html
new file mode 100644
index 00000000000..413b7b906e7
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010-ref.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: 90px 10px repeat(2, 50px 20px) 50px;
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 100px;
+    width: 6px;
+  }
+  .row-gap {
+    position: absolute;
+    background: red;
+    height: 10px;
+    width: 100px;
+  }
+   .simulated-row-gap {
+    grid-column: 1/3;
+    background-color: lightgray !important;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="column-gap" style="left: 47px; top: 0px;"></div>
+  <div class="column-gap" style="left: 157px; top: 0px;"></div>
+  <div class="column-gap" style="left: 267px; top: 0px; height: 90px;"></div>
+
+  <div class="row-gap" style="left: 110px; top: 55px;"></div>
+  <div class="row-gap" style="left: 220px; top: 25px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html
new file mode 100644
index 00000000000..f2775ff6a94
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-010.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in a grid that's fragmented. Suppressed row gaps do not have decorations.
+  Tests scenario with some row gaps being suppressed due to different row sizes.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-010-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: 90px repeat(3, 50px);
+    column-gap: 10px;
+    row-gap: 20px;
+    row-rule: solid 10px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011-ref.html
new file mode 100644
index 00000000000..5fca8af8fb1
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011-ref.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: 50px 20px 50px 80px 50px 20px 50px;
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    top: 0px;
+    height: 100px;
+    width: 6px;
+  }
+  .row-gap {
+    position: absolute;
+    background: red;
+    height: 10px;
+    width: 100px;
+  }
+     .simulated-row-gap {
+    grid-column: 1/3;
+    background-color: lightgray !important;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+     <div class="simulated-row-gap"></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="column-gap" style="left: 47px;"></div>
+  <div class="column-gap" style="left: 157px;"></div>
+  <div class="column-gap" style="left: 267px;"></div>
+  <div class="column-gap" style="left: 377px; height: 20px;"></div>
+
+  <div class="row-gap" style="top: 55px; left: 0px;"></div>
+  <div class="row-gap" style="top: 55px; left: 220px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html
new file mode 100644
index 00000000000..620aeb22746
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-011.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps do not
+  have decorations. Test scenario with a forced break.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-011-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 50px);
+    column-gap: 10px;
+    row-gap: 20px;
+    row-rule: solid 10px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div style="break-before: column;"></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012-ref.html
new file mode 100644
index 00000000000..ab31c89758b
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012-ref.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 215px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(21, 10px) 5px repeat(3, 10px);
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: lightgray;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 215px;
+    width: 6px;
+  }
+  .row-set {
+    position: absolute;
+    width: 100px;
+    left: 0px;
+    top: 12.5px;
+    height: 205px;
+    display: flex;
+    flex-direction: column;
+    row-gap: 15px;
+  }
+  .row-set>div {
+    background: red;
+    width: 100px;
+    height: 5px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2; background: skyblue;"></div>
+    <div style="grid-row: 23/24; background: skyblue;"></div>
+  </div>
+
+  <div class="column-gap" style="top: 0px; left: 47px;"></div>
+  <div class="column-gap" style="top: 0px; left: 157px; height: 30px;"></div>
+
+  <div class="row-set">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+
+  <div class="row-set" style="left: 110px;">
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html
new file mode 100644
index 00000000000..c4a151785a1
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-012.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps
+  do not have decorations. Test scenario with a sparse grid and the row gap above
+  an item is split between fragmentainers.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-012-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 215px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(13, 10px);
+    column-gap: 10px;
+    row-gap: 10px;
+    row-rule: solid 5px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2;"></div>
+    <div style="grid-row: 12/13"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013-ref.html
new file mode 100644
index 00000000000..ab31c89758b
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013-ref.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 215px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(21, 10px) 5px repeat(3, 10px);
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: lightgray;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 215px;
+    width: 6px;
+  }
+  .row-set {
+    position: absolute;
+    width: 100px;
+    left: 0px;
+    top: 12.5px;
+    height: 205px;
+    display: flex;
+    flex-direction: column;
+    row-gap: 15px;
+  }
+  .row-set>div {
+    background: red;
+    width: 100px;
+    height: 5px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2; background: skyblue;"></div>
+    <div style="grid-row: 23/24; background: skyblue;"></div>
+  </div>
+
+  <div class="column-gap" style="top: 0px; left: 47px;"></div>
+  <div class="column-gap" style="top: 0px; left: 157px; height: 30px;"></div>
+
+  <div class="row-set">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+
+  <div class="row-set" style="left: 110px;">
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html
new file mode 100644
index 00000000000..4cd158993c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-013.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps
+  do not have decorations. Test scenario with a sparse grid and a forced break.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-013-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 215px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(13, 10px);
+    column-gap: 10px;
+    row-gap: 10px;
+    row-rule: solid 5px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2;"></div>
+    <div style="grid-row: 12/13; break-before: column;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014-ref.html
new file mode 100644
index 00000000000..acca25a6f6f
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014-ref.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 234px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(23, 10px) 4px repeat(2, 10px);
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: lightgray;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 234px;
+    width: 6px;
+  }
+  .row-set {
+    position: absolute;
+    width: 100px;
+    left: 0px;
+    top: 12.5px;
+    height: 205px;
+    display: flex;
+    flex-direction: column;
+    row-gap: 15px;
+  }
+  .row-set>div {
+    background: red;
+    width: 100px;
+    height: 5px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2; background: skyblue;"></div>
+    <div style="grid-row: 23/24; background: skyblue;"></div>
+  </div>
+
+  <div class="column-gap" style="top: 0px; left: 47px;"></div>
+  <div class="column-gap" style="top: 0px; left: 157px; height: 10px;"></div>
+
+  <div class="row-set">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html
new file mode 100644
index 00000000000..1615e42eb32
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-014.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps
+  do not have decorations. Test scenario with a sparse grid and a row gap
+  below an item that is split between fragmentainers.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-014-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 234px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(13, 10px);
+    column-gap: 10px;
+    row-gap: 10px;
+    row-rule: solid 5px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2;"></div>
+    <div style="grid-row: 12/13;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015-ref.html
new file mode 100644
index 00000000000..a3d4064ae77
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015-ref.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(20, 10px) 100px repeat(3, 10px);
+    column-gap: 10px;
+    background: teal;
+  }
+  .column-gap {
+    position: absolute;
+    top: 0px;
+    height: 100px;
+    background: blue;
+    width: 6px;
+  }
+  .row-set {
+    position: absolute;
+    width: 100px;
+    left: 0px;
+    top: 12.5px;
+    height: 205px;
+    display: flex;
+    flex-direction: column;
+    row-gap: 15px;
+  }
+  .row-set>div {
+    background: red;
+    width: 100px;
+    height: 5px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2; background: skyblue;"></div>
+    <div style="grid-row: 22/23; background: skyblue;"></div>
+  </div>
+
+  <div class="column-gap" style="left: 47px;"></div>
+  <div class="column-gap" style="left: 157px;"></div>
+  <div class="column-gap" style="left: 267px;"></div>
+  <div class="column-gap" style="height: 30px; left: 377px;"></div>
+
+  <div class="row-set">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="row-set" style="left: 110px;">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="row-set" style="left: 330px">
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html
new file mode 100644
index 00000000000..14c46907e68
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-015.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps
+  do not have decorations. Test scenario with a sparse grid and one empty track
+  exists in a fragmentainer due to a forced break.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<link rel="match" href="grid-gap-decorations-fragmentation-015-ref.html">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(13, 10px);
+    column-gap: 10px;
+    row-gap: 10px;
+    row-rule: solid 5px red;
+    column-rule: solid 6px blue;
+    background: teal;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div style="grid-row: 1/2;"></div>
+    <div style="grid-row: 12/13; break-before:column;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016-ref.html
new file mode 100644
index 00000000000..6cb670b7e5b
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016-ref.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 92px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(18, 10px) 4px 50px;;
+    column-gap: 10px;
+    background: teal;
+  }
+
+  .column-gap {
+    position: absolute;
+    top: 0px;
+    height: 92px;
+    background: blue;
+    width: 6px;
+  }
+  .row-set {
+    position: absolute;
+    width: 100px;
+    left: 0px;
+    top: 12.5px;
+    height: 205px;
+    display: flex;
+    flex-direction: column;
+    row-gap: 15px;
+  }
+  .row-set>div {
+    background: red;
+    width: 100px;
+    height: 5px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+  </div>
+
+  <div class="column-gap" style="left: 47px;"></div>
+  <div class="column-gap" style="left: 157px;"></div>
+  <div class="column-gap" style="left: 267px; height: 50px;"></div>
+
+  <div class="row-set">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="row-set" style="left: 110px;">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+  <div class="row-set" style="left: 220px">
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html
new file mode 100644
index 00000000000..9916d91fdc8
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-016.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in grid that's fragmented. Suppressed row gaps do not have decorations.
+  Tests scenario where an empty grid fragments on its row gaps.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<link rel="match" href="grid-gap-decorations-fragmentation-016-ref.html">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 92px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(13, 10px);
+    column-gap: 10px;
+    row-gap: 10px;
+    row-rule: solid 5px red;
+    column-rule: solid 6px blue;
+    background: teal;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017-ref.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017-ref.html
new file mode 100644
index 00000000000..8f6172a89e8
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017-ref.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    position: relative;
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 90px 10px);
+    column-gap: 10px;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .simulated-row-gap {
+    grid-column: 1/3;
+    background-color: lightgray !important;
+  }
+  .column-gap {
+    position: absolute;
+    background: blue;
+    height: 100px;
+    width: 6px;
+  }
+  .margin-top {
+    margin-top: 10px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div class="simulated-row-gap"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="simulated-row-gap"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="simulated-row-gap"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+  </div>
+  <div class="column-gap" style="left: 47px; top: 0px;"></div>
+  <div class="column-gap" style="left: 157px; top: 0px;"></div>
+  <div class="column-gap" style="left: 267px; top: 0px;"></div>
+  <div class="column-gap" style="left: 377px; top: 0px; height: 90px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html
new file mode 100644
index 00000000000..891d93edac7
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/grid/fragmentation/grid-gap-decorations-fragmentation-017.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>
+  Gap Decorations are shown in a grid that's fragmented. Suppressed row gaps do not have decorations.
+  Tests scenario where all row gaps are suppressed but margins are unsuppressed.
+</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11520">
+<link rel="match" href="grid-gap-decorations-fragmentation-017-ref.html">
+<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
+<style>
+  body {
+    margin: 0px;
+  }
+  .multi-col {
+    height: 100px;
+    width: 320px;
+    columns: 3;
+    column-fill: auto;
+    column-gap: 10px;
+    background: lightgray;
+
+  }
+  .grid-container {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    grid-template-rows: repeat(4, 90px);
+    column-gap: 10px;
+    row-gap: 20px;
+    row-rule: solid 10px red;
+    column-rule: solid 6px blue;
+  }
+  .grid-container>div {
+    background-color: skyblue;
+  }
+  .margin-top {
+    margin-top: 10px;
+  }
+</style>
+<div class="multi-col">
+  <div class="grid-container">
+    <div></div>
+    <div></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+    <div class="margin-top"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-004-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-004-ref.html
index 002b1f2b594..76a0200d10d 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-004-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-004-ref.html
@@ -54,7 +54,7 @@
 
     .column-gap {
         position: absolute;
-        height: 130px;
+        height: 60px;
         width: 4px;
         background: blue;
         top: 2px;
@@ -74,5 +74,7 @@
     </div>
     <div class="column-gap" style="left:65px;"></div>
     <div class="column-gap" style="left:135px;"></div>
+    <div class="column-gap" style="left:65px; top: 72px"></div>
+    <div class="column-gap" style="left:135px; top: 72px"></div>
     <div class="row-gap"></div>
 </div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-007-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-007-ref.html
index 09973ddc690..fa48b608fdc 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-007-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-007-ref.html
@@ -82,7 +82,7 @@
 
     .column-gap3 {
         background: blue;
-        height: 130px;
+        height: 100px;
         position: absolute;
         width: 10px;
         top: 0px;
@@ -110,9 +110,10 @@
         <div class="column-gap1" style="height: 20px; left:calc(2px + 85.333px + 5px)"></div>
         <div class="column-gap1" style="height: 20px; left:calc(2px + 85.333px + 5px + 10px + 5px + 85.333px + 5px)">
         </div>
-        <div class="column-gap2" style="height: 160px; left:calc(2px + 85.333px + 5px)"></div>
-        <div class="column-gap2" style="height: 160px; left:calc(2px + 85.333px + 5px + 10px + 5px + 85.333px + 5px)">
-        </div>
+        <div class="column-gap2" style="height: 100px; left:calc(2px + 85.333px + 5px)"></div>
+        <div class="column-gap2" style="height: 100px; left:calc(2px + 85.333px + 5px + 10px + 5px + 85.333px + 5px)"></div>
+        <div class="column-gap2" style="top: 160px; height: 40px; left:calc(2px + 85.333px + 5px)"></div>
+        <div class="column-gap2" style="top: 160px; height: 40px; left:calc(2px + 85.333px + 5px + 10px + 5px + 85.333px + 5px)"></div>
         <div class="row-gap1"></div>
     </div>
     <div class="inner2">
@@ -128,6 +129,7 @@
         </div>
         <div class="column-gap3" style="left:calc(85.333px + 5px);"></div>
         <div class="column-gap3" style="left:calc(85.333px + 5px + 10px + 5px + 85.333px + 5px);"></div>
+        <div class="column-gap3" style="top: 120px; height: 10px;left:calc(85.333px + 5px);"></div>
+        <div class="column-gap3" style="top: 120px; height: 10px;left:calc(85.333px + 5px + 10px + 5px + 85.333px + 5px);"></div>
         <div class="row-gap2"></div>
     </div>
-</div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-008-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-008-ref.html
index d49c2f50f19..751f2edbe4d 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-008-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-008-ref.html
@@ -51,7 +51,7 @@
     }
 
     .row-gap-items {
-        width: 60px;
+        width: 200px;
         background: gold;
     }
 
@@ -102,8 +102,6 @@
     </div>
     <div class="row-gap">
         <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
     </div>
     <div class="spanner"></div>
     <div class="column-gap1" style="left:62px;"></div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009-ref.html
index 124bf7eaeb1..ccf43e2dfd2 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009-ref.html
@@ -51,7 +51,7 @@
     }
 
     .row-gap-items {
-        width: 64px;
+        width: 204px;
         background: gold;
     }
 
@@ -101,6 +101,9 @@
         <div class="items2"></div>
         <div class="items2"></div>
     </div>
+    <div class="row-gap">
+        <div class="row-gap-items"></div>
+    </div>
     <div class="column-gap1" style="left:62px;"></div>
     <div class="column-gap1" style="left:132px;"></div>
     <div class="column-gap2" style="left:62px;"></div>
@@ -108,9 +111,4 @@
     <div class="spanner"></div>
     <div class="column-gap3" style="left:62px;"></div>
     <div class="column-gap3" style="left:132px;"></div>
-    <div class="row-gap">
-        <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
-    </div>
 </div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009.html
index b00c6a70f8a..70b2dd18c76 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-009.html
@@ -31,6 +31,7 @@
         column-width: 60px;
         column-count: 3;
         column-fill: auto;
+        gap-rule-overlap: column-over-row;
     }
 
     p {
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-010-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-010-ref.html
index 9582ab4103d..778331b0803 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-010-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-010-ref.html
@@ -65,7 +65,7 @@
     }
 
     .row-gap-items {
-        width: 56px;
+        width: 196px;
         background: gold;
     }
 
@@ -122,8 +122,6 @@
     </div>
     <div class="row-gap">
         <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
-        <div class="row-gap-items"></div>
     </div>
     <div class="column-gap1" style="left:62px;"></div>
     <div class="column-gap1" style="left:132px;"></div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-011-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-011-ref.html
index 3387918d399..28ae9919f38 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-011-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-011-ref.html
@@ -73,7 +73,7 @@
 
     .column-gap2 {
         position: absolute;
-        height: 142px;
+        height: 60px;
         width: 2px;
         background: blue;
         top: 60px;
@@ -110,6 +110,8 @@
     <div class="column-gap1" style="left:136px;"></div>
     <div class="column-gap2" style="left:66px;"></div>
     <div class="column-gap2" style="left:136px;"></div>
+    <div class="column-gap2" style="top: 130px; height: 72px; left:66px;"></div>
+    <div class="column-gap2" style="top: 130px; height: 72px; left:136px;"></div>
     <div class="row-gap"></div>
     <div class="spanner"></div>
 </div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-012-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-012-ref.html
index 9fb5e85e920..fc9203bd136 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-012-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-012-ref.html
@@ -65,7 +65,7 @@
 
     .column-gap1 {
         position: absolute;
-        height: 200px;
+        height: 118px;
         width: 2px;
         background: blue;
         top: 2px;
@@ -99,6 +99,8 @@
     </div>
     <div class="column-gap1" style="left:66px;"></div>
     <div class="column-gap1" style="left:136px;"></div>
+    <div class="column-gap1" style="top: 130px; height: 72px;left:66px;"></div>
+    <div class="column-gap1" style="top: 130px; height: 72px;left:136px;"></div>
     <div class="row-gap"></div>
     <div class="spanner"></div>
 </div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-014-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-014-ref.html
index 9d9674bd476..15ea3102c88 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-014-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-014-ref.html
@@ -57,6 +57,4 @@
 <div class="last-item"></div>
 <div class="column-gap" style="left:62px;"></div>
 <div class="column-gap" style="left:132px;"></div>
-<div class="column-gap" style="left:62px; top: 72px;"></div>
-<div class="column-gap" style="left:132px; top: 72px;"></div>
 <div class="row-gap"></div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-017-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-017-ref.html
index 23fd089ac8e..ca193c8780e 100644
--- a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-017-ref.html
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-017-ref.html
@@ -44,6 +44,6 @@
     <div class="items"></div>
     <div class="items"></div>
 </div>
-<div class="row-gap"></div>
 <div class="column-gap" style="left:58.666px;"></div>
 <div class="column-gap" style="left:135.332px;"></div>
+<div class="row-gap"></div>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020-ref.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020-ref.html
new file mode 100644
index 00000000000..e11c6a14dea
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020-ref.html
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
+<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
+ <style>
+  body {
+    margin: 0px;
+  }
+
+  #container {
+    border: 2px solid rgb(96 139 168);
+    width: 200px;
+    height: 200px;
+    column-gap: 10px;
+    row-gap: 10px;
+    column-width: 60px;
+    column-count: 3;
+    column-fill: auto;
+  }
+
+  p {
+    background: rgb(96 139 168 / 0.2);
+    height: 50px;
+    margin: 0px;
+  }
+
+  h2 {
+    column-span: all;
+    background-color: #4d4e53;
+    color: #fff;
+    margin: 0px;
+    opacity: 0.5;
+  }
+
+  .column-decor-container {
+    position: absolute;
+    display: flex;
+    flex-direction: column;
+    top: 2px;
+    left: 62px;
+    row-gap: 18px;
+    height: 200px;
+  }
+
+  .column-decor {
+    width: 10px;
+    height: 200px;
+    background: blue;
+  }
+
+</style>
+
+<body>
+  <div class="column-decor-container">
+    <div class="column-decor">
+    </div>
+  </div>
+  <div class="column-decor-container" style="left: 132px">
+    <div class="column-decor">
+    </div>
+  </div>
+  <div id="container">
+    <p>One</p>
+    <p>Two</p>
+    <h2>Spanner</h2>
+
+    <p>Three</p>
+    <p>Four</p>
+    <p>Five</p>
+    <h2>Spanner</h2>
+    <p>Six</p>
+    <p>Seven</p>
+    <p>Eight</p>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020.html b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020.html
new file mode 100644
index 00000000000..68fd30cb5e5
--- /dev/null
+++ b/tests/wpt/tests/css/css-gaps/multicol/multicol-gap-decorations-020.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<title>
+    CSS Gap Decorations: Multicolumn gap decorations painted in container with two spanners and rule break none.
+</title>
+<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
+<link rel="match" href="multicol-gap-decorations-020-ref.html">
+<link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
+ <style>
+  body {
+    margin: 0px;
+  }
+
+  #container {
+    border: 2px solid rgb(96 139 168);
+    width: 200px;
+    height: 200px;
+    column-gap: 10px;
+    row-gap: 10px;
+    column-rule-width: 10px;
+    column-rule-style: solid;
+    column-rule-color: blue;
+    column-rule-break: none;
+    column-rule-outset: 0;
+    row-rule-width: 10px;
+    row-rule-style: solid;
+    row-rule-color: gold;
+    column-width: 60px;
+    column-count: 3;
+    column-fill: auto;
+  }
+
+  p {
+    background: rgb(96 139 168 / 0.2);
+    height: 50px;
+    margin: 0px;
+  }
+
+  h2 {
+    column-span: all;
+    background-color: #4d4e53;
+    color: #fff;
+    margin: 0px;
+    opacity: 0.5;
+  }
+
+</style>
+
+<body>
+  <div id="container">
+    <p>One</p>
+    <p>Two</p>
+    <h2>Spanner</h2>
+
+    <p>Three</p>
+    <p>Four</p>
+    <p>Five</p>
+    <h2>Spanner</h2>
+    <p>Six</p>
+    <p>Seven</p>
+    <p>Eight</p>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001-ref.html
new file mode 100644
index 00000000000..e53745d7933
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001-ref.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(3, 100px);
+    background: gray;
+    width: 300px;
+    align-items: start;
+    justify-items: center;
+}
+.flex {
+    display: flex;
+    align-items: center;
+    flex-direction: column;
+}
+.two-span-item {
+    background-color: lightpink;
+}
+.fifty-width {
+    width: 50px;
+    background-color: lightblue;
+}
+</style>
+<body>
+  <p>Test that using justify-items centers each item to the grid-axis track it is on.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="fifty-width">
+        This is some text
+      </div>
+      <div class="two-span-item">
+        This is text
+      </div>
+      <div class="two-span-item">
+        This is text
+      </div>
+    </div>
+    <div class="fifty-width">
+      Some larger words in this sentence
+    </div>
+    <div class="fifty-width">
+      The cat cannot be taken from milk
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html
new file mode 100644
index 00000000000..bfc94260372
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-center-001.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Centered alignment in grid axis</title>
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#alignment">
+<link rel="match" href="column-justify-items-center-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 100px);
+    width: 300px;
+    justify-items: center;
+}
+
+.fifty-width {
+    width: 50px;
+    background-color: lightblue;
+}
+</style>
+<body>
+  <p>Test that using justify-items centers each item to the grid-axis track it is on.</p>
+  <div class="masonry">
+    <div class="fifty-width">
+      This is some text
+    </div>
+    <div class="fifty-width">
+      Some larger words in this sentence
+    </div>
+    <div class="fifty-width">
+      The cat cannot be taken from milk
+    </div>
+    <div style="background-color: lightpink; width: fit-content;">
+      This is text
+    </div>
+    <div style="background-color: lightpink; width: fit-content;">
+      This is text
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001-ref.html
new file mode 100644
index 00000000000..1b21df137df
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001-ref.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(3, 100px);
+    background: gray;
+    width: 300px;
+    align-items: start;
+    justify-items: end;
+}
+.flex {
+    display: flex;
+    align-items: end;
+    flex-direction: column;
+}
+.two-span-item {
+    background-color: lightpink;
+}
+.fifty-width {
+    width: 50px;
+    background-color: lightblue;
+}
+</style>
+<body>
+  <p>Test that using justify-items moves each masonry item to the end of the grid-axis track it is on</p>
+  <p>and that justify-self overrides justify-items.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="fifty-width">
+        This is some text
+      </div>
+      <div class="two-span-item">
+        This is text
+      </div>
+      <div class="two-span-item">
+        This is text
+      </div>
+    </div>
+    <div class="fifty-width" style="justify-self: start">
+      Some larger words in this sentence
+    </div>
+    <div class="fifty-width">
+      The cat cannot be taken from milk
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html
new file mode 100644
index 00000000000..fda9aeab3d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-justify-items-end-justify-self-start-001.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Masonry Test: Alignment for items and self in grid axis</title>
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#alignment">
+<link rel="match" href="column-justify-items-end-justify-self-start-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 100px);
+    width: 300px;
+    justify-items: end;
+}
+
+.fifty-width {
+    width: 50px;
+    background-color: lightblue;
+}
+</style>
+<body>
+  <p>Test that using justify-items moves each masonry item to the end of the grid-axis track it is on</p>
+  <p>and that justify-self overrides justify-items.</p>
+  <div class="masonry">
+    <div class="fifty-width">
+      This is some text
+    </div>
+    <div class="fifty-width" style="justify-self: start">
+      Some larger words in this sentence
+    </div>
+    <div class="fifty-width">
+      The cat cannot be taken from milk
+    </div>
+    <div style="background-color: lightpink; width: fit-content;">
+      This is text
+    </div>
+    <div style="background-color: lightpink; width: fit-content;">
+      This is text
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001-ref.html
new file mode 100644
index 00000000000..33162a1e930
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001-ref.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-columns: 50px;
+    justify-items: unsafe center;
+    width: 50px;
+}
+.overflow-safe {
+    justify-self: safe end;
+    width: 75px;
+    height: 50px;
+    background-color: lightgreen;
+}
+.overflow-unsafe {
+    justify-self: unsafe flex-end;
+    width: 75px;
+    height: 50px;
+    background-color: lightblue;
+}
+.small-center-item {
+    width: 25px;
+    background-color: lightyellow;
+}
+</style>
+<body>
+  <p>Test that overflow safe and unsafe are working as expected.
+  <div class="grid">
+    <div class="overflow-safe">
+      Overflow safe
+    </div>
+    <div style="width: 50px; background-color: lightpink;">
+      Regular item
+    </div>
+    <div class="overflow-unsafe">
+      Overflow unsafe
+    </div>
+    <div class="small-center-item">
+      Small item
+    </div>
+    <div style="width: 150px; background-color: brown">
+      Overflow center
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html
new file mode 100644
index 00000000000..a60df86dc9f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/column-overflow-alignment-001.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-overflow-alignment-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: 50px;
+    justify-items: unsafe center;
+    width: 50px;
+}
+.overflow-safe {
+    justify-self: safe end;
+    width: 75px;
+    height: 50px;
+    background-color: lightgreen;
+}
+.overflow-unsafe {
+    justify-self: unsafe end;
+    width: 75px;
+    height: 50px;
+    background-color: lightblue;
+}
+.small-item {
+    width: 25px;
+    background-color: lightyellow;
+}
+</style>
+<body>
+  <p>Test that overflow safe and unsafe are working as expected.
+  <div class="masonry">
+    <div class="overflow-safe">
+      Overflow safe
+    </div>
+    <div style="width: 50px; background-color: lightpink;">
+      Regular item
+    </div>
+    <div class="overflow-unsafe">
+      Overflow unsafe
+    </div>
+    <div class="small-item">
+      Small item
+    </div>
+    <div style="width: 150px; background-color: brown">
+      Overflow center
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-001.html
index fe6dd1a5d12..ea06e04a358 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-001.html
@@ -20,11 +20,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-002.html
index 15fd7d1a003..663aef52639 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-002.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-003.html
index 7e6fb39fa11..cc2ef146e31 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-003.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-003.html
@@ -20,11 +20,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   background: content-box silver;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-004.html
index 3e400d6607a..a6d52d689be 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-004.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-align-content-004.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,20px);
   background: content-box silver;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-001.html
index c783f5c6732..3e8b2249234 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-001.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-002.html
index 89d09dddb41..a8e39f74fa1 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-002.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-003.html
index 51a84163262..303ae662b22 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-003.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-003.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,20px);
   background: content-box silver;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-004.html
index 6099aca4aad..404784229c8 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-004.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/masonry-justify-content-004.html
@@ -19,11 +19,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,20px);
   background: content-box silver;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001-ref.html
new file mode 100644
index 00000000000..b65d77dff1d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(3, 100px);
+    grid-template-columns: 100px auto;
+    width: 300px;
+    align-items: center;
+}
+</style>
+<body>
+  <p>Test that using align-items centers each item to the grid-axis track it is on.</p>
+  <div class="grid">
+    <div style="width: 50px; height: 50px; background-color: lightblue;"></div>
+    <div style="background-color: lightpink; height: 80px; width: 200px; grid-row: span 2;"></div>
+    <div style="width: 100px; height: 15px; background-color: lightsalmon;"></div>
+    <div style="width: 25px; height: 25px; background-color: plum;"></div>
+    <div style="background-color: lightgreen; width: 60px; height: 60px; transform: translateX(-75px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html
new file mode 100644
index 00000000000..fed1078fd9d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-center-001.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Centered alignment in grid axis</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#alignment">
+<link rel="match" href="row-align-items-center-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: repeat(3, 100px);
+    width: 300px;
+    align-items: center;
+}
+</style>
+<body>
+  <p>Test that using align-items centers each item to the grid-axis track it is on.</p>
+  <div class="masonry">
+    <div style="width: 50px; height: 50px; background-color: lightblue;"></div>
+    <div style="width: 100px; height: 15px; background-color: lightsalmon;"></div>
+    <div style="width: 25px; height: 25px; background-color: plum;"></div>
+    <div style="background-color: lightgreen; width: 60px; height: 60px;"></div>
+    <div style="background-color: lightpink; height: 80px; width: 200px; grid-row: span 2;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001-ref.html
new file mode 100644
index 00000000000..9e50d579475
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(3, 100px);
+    grid-template-columns: 100px auto;
+    width: 300px;
+    align-items: end;
+}
+</style>
+<body>
+  <p>Test that using align-items moves each masonry item to the end of the grid-axis track it is on</p>
+  <p>and that align-self overrides align-items.</p>
+  <div class="grid">
+    <div style="width: 50px; height: 50px; background-color: lightblue;"></div>
+    <div style="background-color: lightpink; height: 80px; width: 200px; grid-row: span 2;"></div>
+    <div style="width: 100px; height: 15px; background-color: lightsalmon; align-self: start;"></div>
+    <div style="width: 25px; height: 25px; background-color: plum;"></div>
+    <div style="background-color: lightgreen; width: 60px; height: 60px; transform: translateX(-75px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html
new file mode 100644
index 00000000000..a58258be2c4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-align-items-end-align-self-start-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Masonry Test: Alignment for items and self in grid axis</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#alignment">
+<link rel="match" href="row-align-items-end-align-self-start-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: repeat(3, 100px);
+    width: 300px;
+    align-items: end;
+}
+
+.fifty-width {
+    width: 50px;
+    background-color: lightblue;
+}
+</style>
+<body>
+  <p>Test that using align-items moves each masonry item to the end of the grid-axis track it is on</p>
+  <p>and that align-self overrides align-items.</p>
+  <div class="masonry">
+    <div style="width: 50px; height: 50px; background-color: lightblue;"></div>
+    <div style="width: 100px; height: 15px; background-color: lightsalmon; align-self: start;"></div>
+    <div style="width: 25px; height: 25px; background-color: plum;"></div>
+    <div style="background-color: lightgreen; width: 60px; height: 60px;"></div>
+    <div style="background-color: lightpink; height: 80px; width: 200px; grid-row: span 2;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001-ref.html
new file mode 100644
index 00000000000..9d7da147e21
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001-ref.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: 70px;
+    grid-template-columns: 75px 50px 75px 100px;
+    align-items: unsafe center;
+    width: 300px;
+    height: 70px;
+}
+.overflow-safe {
+    align-self: safe end;
+    width: 75px;
+    height: 75px;
+    background-color: lightgreen;
+}
+.overflow-unsafe {
+    align-self: unsafe end;
+    width: 75px;
+    height: 75px;
+    background-color: lightblue;
+}
+.small-item {
+    width: 50px;
+    background-color: lightyellow;
+}
+</style>
+<body>
+  <p>Test that overflow safe and unsafe are working as expected.
+  <div class="grid">
+    <div class="overflow-safe">
+      Overflow safe
+    </div>
+    <div style="width: 50px; background-color: lightpink;">
+      Regular item
+    </div>
+    <div class="overflow-unsafe">
+      Overflow unsafe
+    </div>
+    <div style="height: 150px; width: 100px; background-color: brown">
+      Overflow center
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html
new file mode 100644
index 00000000000..cbd2774797c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/alignment/row-overflow-alignment-001.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-overflow-alignment-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: 70px;
+    align-items: unsafe center;
+    width: 300px;
+    height: 70px;
+}
+.overflow-safe {
+    align-self: safe end;
+    width: 75px;
+    height: 75px;
+    background-color: lightgreen;
+}
+.overflow-unsafe {
+    align-self: unsafe end;
+    width: 75px;
+    height: 75px;
+    background-color: lightblue;
+}
+.small-item {
+    width: 50px;
+    background-color: lightyellow;
+}
+</style>
+<body>
+  <p>Test that overflow safe and unsafe are working as expected.
+  <div class="masonry">
+    <div class="overflow-safe">
+      Overflow safe
+    </div>
+    <div style="width: 50px; background-color: lightpink; height: fit-content;">
+      Regular item
+    </div>
+    <div class="overflow-unsafe">
+      Overflow unsafe
+    </div>
+    <div style="height: 150px; width: 100px; background-color: brown">
+      Overflow center
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001.html
index dc031798844..790f859cd9f 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001.html
@@ -17,15 +17,14 @@ html,body {
 
 .grid {
   float: left;
-  display: grid;
   display: masonry;
-  grid: masonry / repeat(4, auto);
+  grid: none / repeat(4, auto);
   border: 2px solid;
   padding: 1px;
   margin: 1px;
 }
 .c {
-  grid: repeat(4, auto) / masonry;
+  grid: repeat(4, auto) / none;
   masonry-direction: row;
 }
 
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-001.html
index b363d8ebc19..49e87785648 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-001.html
@@ -17,16 +17,15 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
 
 .grid {
   float: left;
-  display: grid;
   display: masonry;
-  grid: masonry / repeat(4, auto);
+  grid: none / repeat(4, auto);
   place-items: start;
   padding-block-start: 1px;
   margin-left: 1px;
   border:1px solid;
 }
 .c {
-  grid: repeat(4, auto) / masonry;
+  grid: repeat(4, auto) / none;
   masonry-direction: row;
 }
 
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
index ee57fa387b5..f8a6fa47a30 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
@@ -17,9 +17,8 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
 
 .grid {
   float: left;
-  display: grid;
   display: masonry;
-  grid: masonry / repeat(4, auto);
+  grid: none / repeat(4, auto);
   place-items: start;
   padding-block-start: 1px;
   margin-left: 1px;
@@ -28,7 +27,7 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
   width: 100px;
 }
 .c {
-  grid: repeat(4, auto) / masonry;
+  grid: repeat(4, auto) / none;
   masonry-direction: row;
 }
 .ae { align-content: end; }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
index ebdda343005..beb4ed1b3dc 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
@@ -17,9 +17,8 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
 
 .grid {
   float: left;
-  display: grid;
   display: masonry;
-  grid: masonry / repeat(4, auto);
+  grid: none / repeat(4, auto);
   place-items: start;
   padding-block-start: 1px;
   margin-left: 1px;
@@ -28,7 +27,7 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
   width: 100px;
 }
 .c {
-  grid: repeat(4, auto) / masonry;
+  grid: repeat(4, auto) / none;
   masonry-direction: row;
 }
 .ae { align-content: end; }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001-ref.html
new file mode 100644
index 00000000000..9f511241082
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001-ref.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<body>
+  <p>Test that an empty masonry container renders nothing.</p>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001.html
new file mode 100644
index 00000000000..a8c3ed33ab7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-001.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-empty-masonry-container-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.empty-container {
+  display: masonry;
+}
+</style>
+<body>
+  <p>Test that an empty masonry container renders nothing.</p>
+  <div class="empty-container"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002-ref.html
new file mode 100644
index 00000000000..fd63c61d7bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002-ref.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.empty-container {
+  display: grid;
+  padding: 20px;
+  background: gray;
+};
+</style>
+<body>
+  <p>Test that an empty masonry container still renders padding.</p>
+  <div class="empty-container">
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002.html
new file mode 100644
index 00000000000..54628e25412
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/column-empty-masonry-container-002.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-empty-masonry-container-002-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    padding: 20px;
+}
+</style>
+<body>
+  <p>Test that an empty masonry container still renders padding.</p>
+  <div class="masonry"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-001.html
index ed035e4a2a7..f36314f1faf 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-001.html
@@ -31,10 +31,8 @@ wrapper {
   background-color: rgba(10,100,10,.5);
 }
 .grid {
-  display: grid;
   display: masonry;
   grid-template-columns: 10px 15px 20px;
-  grid-template-rows: masonry;
   border: 1px solid;
   gap: 2px;
 }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-002.html
index 02c7f34ccfc..c9467a8ea42 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-002.html
@@ -31,10 +31,8 @@ wrapper {
   background-color: rgba(10,100,10,.5);
 }
 .grid {
-  display: grid;
   display: masonry;
   grid-template-columns: 10px 15px 20px;
-  grid-template-rows: masonry;
   border: 1px solid;
   gap: 2px;
 }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003.html
index 8bfaec32771..89d812c55b7 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003.html
@@ -28,10 +28,9 @@ wrapper {
 }
 
 .grid {
-  display: grid;
   display: masonry;
   masonry-direction: row;
-  grid: 20px auto 30px / masonry;
+  grid: 20px auto 30px / none;
   border: solid;
   border-width: 3px 1px 7px 5px;
   padding: 1px 3px 5px 7px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001-ref.html
new file mode 100644
index 00000000000..e7dd7a3c30e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001-ref.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(3, 100px);
+    width: 400px;
+    gap: 50px;
+    padding: 20px;
+    align-items: start;
+}
+
+.flex {
+    display: flex;
+    flex-direction: column;
+    overflow: visible;
+    flex-wrap: nowrap;
+    gap: 10px;
+}
+
+.grid-auto-item-1 {
+    background: lightskyblue;
+    width: 80px;
+    padding: 10px;
+}
+
+.grid-auto-item-2 {
+    background: lightcoral;
+    width: 80px;
+    padding: 10px;
+}
+
+.grid-auto-item-3 {
+    background: lightgreen;
+    width: 80px;
+    padding: 10px;
+}
+
+.grid-auto-item-4 {
+    background: lightpink;
+    padding: 10px;
+    width: calc(200% + 30px);
+    transform: translateX(-150px);
+}
+</style>
+<body>
+  <p>Test that gaps are correctly used within masonry containers.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="grid-auto-item-1" style="grid-column: 1">This is some text</div>
+    </div>
+    <div class="flex">
+      <div class="grid-auto-item-2" style="grid-column: 2">Some larger words in this sentence</div>
+      <div class="grid-auto-item-4" style="grid-column: 2">The cat still cannot be separated from milk</div>
+      <div class="grid-auto-item-4" style="grid-column: 2">The cat still cannot be separated from milk</div>
+    </div>
+    <div class="flex">
+      <div class="grid-auto-item-3" style="grid-column: 3">The cat cannot be separated from milk</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001.html
new file mode 100644
index 00000000000..c511db68d2c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/column-gaps-001.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-gaps-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 100px);
+    width: 400px;
+    padding: 20px;
+    gap: 10px 50px;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.two-track-spanner {
+    background: lightpink;
+    grid-column: span 2;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Test that gaps are correctly used within masonry containers.</p>
+  <div class="masonry">
+    <div class="auto-item">This is some text</div>
+    <div class="auto-item">Some larger words in this sentence</div>
+    <div class="auto-item">The cat cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-001.html
index e527ae3ef82..84cc6fd884f 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-001.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 10px 20px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-002.html
index aac7101ef9a..6020ef9937a 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/masonry-gap-002.html
@@ -22,10 +22,8 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001-ref.html
new file mode 100644
index 00000000000..1fb9459713d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001-ref.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(3, 100px);
+    height: 400px;
+    width: 380px;
+    padding: 20px;
+    gap: 50px 10px;
+}
+
+.grid > div {
+    width: 100px;
+    grid-column: 1;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.two-track-spanner {
+    background: lightpink;
+    grid-row: 1 / span 2;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Test that gaps are correctly used within masonry containers.</p>
+  <div class="grid">
+    <div class="auto-item">This is some text</div>
+    <div class="auto-item">Some larger words in this sentence</div>
+    <div class="auto-item">The cat cannot be separated from milk</div>
+    <div class="two-track-spanner" style="grid-column: 2;">The cat still cannot be separated from milk</div>
+    <div class="two-track-spanner" style="grid-column: 3;">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001.html
new file mode 100644
index 00000000000..447f695cbd1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/gap/row-gaps-001.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-gaps-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: repeat(3, 100px);
+    height: 400px;
+    width: 380px;
+    padding: 20px;
+    gap: 50px 10px;
+}
+
+.masonry > div {
+    width: 100px;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.two-track-spanner {
+    background: lightpink;
+    grid-row: span 2;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Test that gaps are correctly used within masonry containers.</p>
+  <div class="masonry">
+    <div class="auto-item">This is some text</div>
+    <div class="auto-item">Some larger words in this sentence</div>
+    <div class="auto-item">The cat cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001-ref.html
new file mode 100644
index 00000000000..85106196b16
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001-ref.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    width: 240px;
+    gap: 20px;
+    padding: 20px;
+    align-items: start;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+    margin-left: 40px;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    margin-top: 40px;
+    margin-right: 40px;
+}
+
+.fourth-track {
+    background: purple;
+    grid-column-start: 4;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="fourth-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html
new file mode 100644
index 00000000000..0b4c746e9e1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-001.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-explicit-placement-001-ref.html">
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    width: 240px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+    margin-left: 40px;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    margin-top: 40px;
+    margin-right: 40px;
+}
+
+.fourth-track {
+    background: purple;
+    grid-column-start: 4;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="fourth-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002-ref.html
new file mode 100644
index 00000000000..28bf1c96769
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+    align-items: start;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+    writing-mode: vertical-rl;
+    margin-left: 10px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    writing-mode: vertical-lr;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html
new file mode 100644
index 00000000000..7342d5dd10b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-002.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-explicit-placement-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+    writing-mode: vertical-rl;
+    margin-left: 10px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    writing-mode: vertical-lr;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003-ref.html
new file mode 100644
index 00000000000..f2855812f4c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: auto auto auto;
+    height: 200px;
+    width: 500px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+    writing-mode: vertical-rl;
+    height: max-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+    width: fit-content;
+    height: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    writing-mode: vertical-lr;
+    height: max-content;
+}
+
+.flex {
+    display: flex;
+    flex-direction: column;
+    gap: 20px;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry with explicit placement are correctly positioned within the grid axis and that the margins on the orthogonal items correctly affect track sizing.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="first-track">This is some text</div>
+      <div class="first-track" style="margin-right: 10px;">This is some text</div>
+      <div class="first-track" style="writing-mode: horizontal-tb;">This is some text</div>
+    </div>
+    <div class="second-track" style="margin-bottom: 10px;">Some larger words in this sentence</div>
+    <div class="flex" style="grid-column-start: 3;">
+      <div class="third-track">The cat cannot be separated from milk</div>
+      <div class="third-track">This is some other text</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html
new file mode 100644
index 00000000000..bcdce25baef
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/column-explicit-placement-003.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-explicit-placement-003-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: column;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: auto auto auto;
+    height: 200px;
+    width: 500px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+    writing-mode: vertical-rl;
+    height: max-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+    width: fit-content;
+    height: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+    writing-mode: vertical-lr;
+    height: max-content;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry with explicit placement are correctly positioned within the grid axis and that the margins on the orthogonal items correctly affect track sizing.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="first-track" style="margin-right: 10px;">This is some text</div>
+    <div class="first-track" style="writing-mode: horizontal-tb">This is some text</div>
+    <div class="second-track" style="margin-bottom: 10px;">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="third-track">This is some other text</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-001.html
index 6c24618e3f5..54cacc9b9c8 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-001.html
@@ -14,12 +14,10 @@
 body,html { color:black; background:white; font-size:15px/1 monospace; padding:0; margin:0; }
 
 .grid {
-  display: grid;
   display: masonry;
   position: relative;
   border: 1px solid;
   grid-template-columns: [A-start] 60px 60px 60px;
-  grid-template-rows: masonry;
   grid-template-areas: "B A";
   grid-auto-columns: 40px;
   grid-gap: 1px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-002.html
index 13b5777b2fb..91ea049cb4d 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/masonry-grid-placement-named-lines-002.html
@@ -14,12 +14,10 @@
 body,html { color:black; background:white; font:15px/1 monospace; padding:0; margin:0; }
 
 .grid {
-  display: grid;
   display: masonry;
   position: relative;
   border: 1px solid;
   grid-template-columns: [A-start] 60px 60px 60px;
-  grid-template-rows: masonry;
   grid-template-areas: "B A";
   grid-auto-columns: 40px;
   grid-auto-flow: dense;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001-ref.html
new file mode 100644
index 00000000000..f854172633a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    width: fit-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    width: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    width: fit-content;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html
new file mode 100644
index 00000000000..1e2ccfbe993
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-001.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002-ref.html
new file mode 100644
index 00000000000..ba3b5e9558f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002-ref.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.grid > div {
+    width: fit-content;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    margin: 20px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 80px;
+    margin-top: 40px;
+    margin-bottom: 80px;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    margin-left: 40px;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html
new file mode 100644
index 00000000000..446161e8110
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-002.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    margin: 20px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 80px;
+    margin-top: 40px;
+    margin-bottom: 80px;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    margin-left: 40px;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003-ref.html
new file mode 100644
index 00000000000..9657c592d66
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    width: fit-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200px;
+    width: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    width: fit-content;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html
new file mode 100644
index 00000000000..57ffae32904
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-003.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200px;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004-ref.html
new file mode 100644
index 00000000000..899080b71a3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    width: fit-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+    width: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    width: fit-content;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html
new file mode 100644
index 00000000000..0ed9751251d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-004.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005-ref.html
new file mode 100644
index 00000000000..c47748e65d6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005-ref.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+#grid {
+    display: grid;
+    grid-template-columns: 200px 200px;
+    background: gray;
+    height: 200px;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div id="grid">
+    <div id="first-item" class="first-track" style="width: fit-content">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div id="fourth-item" class="first-track" style="position: relative;">Some larger words in this sentence</div>
+    <div class="second-track">The cat cannot be separated from milk</div>
+  </div>
+  <script>
+    const grid = document.getElementById('grid');
+    const gridrect = grid.getBoundingClientRect();
+     // Width of the grid, minus padding.
+    const gridwidth = gridrect.width - 40;
+
+    const first_item = document.getElementById('first-item');
+    const width = first_item.getBoundingClientRect().width;
+
+    const fourth_item = document.getElementById('fourth-item');
+    const translation = gridwidth - width;
+    fourth_item.style.left = '-' + translation + 'px';
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html
new file mode 100644
index 00000000000..d516b623d01
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-005.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="first-track">Some larger words in this sentence</div>
+    <div class="second-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006-ref.html
new file mode 100644
index 00000000000..ae9e8d04d6b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006-ref.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    writing-mode: vertical-rl;
+    margin-top: 10px;
+    width: fit-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    width: fit-content;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    writing-mode: vertical-lr;
+    width: fit-content;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html
new file mode 100644
index 00000000000..7c2c5cfd9c1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-006.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-explicit-placement-006-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    writing-mode: vertical-rl;
+    margin-top: 10px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    writing-mode: vertical-lr;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry items with explicit placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007-ref.html
new file mode 100644
index 00000000000..1c41ec327ad
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+#grid {
+    display: grid;
+    grid-template-columns: 200px 200px;
+    background: gray;
+    height: 200px;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis, with an orthogonal item.</p>
+  <div id="grid">
+    <div id="first-item" class="first-track" style="writing-mode: vertical-rl; width: fit-content;">
+      This is some text
+    </div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div id="fourth-item" class="first-track" style="position: relative;">Some larger words in this sentence</div>
+    <div class="second-track">The cat cannot be separated from milk</div>
+  </div>
+  <script>
+    const grid = document.getElementById('grid');
+    const gridrect = grid.getBoundingClientRect();
+     // Width of the grid, minus padding.
+    const gridwidth = gridrect.width - 40;
+
+    const element1 = document.getElementById('first-item');
+    const rect = element1.getBoundingClientRect();
+    const width = rect.width;
+
+    const element4 = document.getElementById('fourth-item');
+    const translation = gridwidth - width;
+    element4.style.left = '-' + translation + 'px';
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html
new file mode 100644
index 00000000000..96febe902ba
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-007.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-explicit-placement-007-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    width: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    height: 200%;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry items with explicit placement are correctly positioned within the grid axis, with an orthogonal item.</p>
+  <div class="masonry">
+    <div class="first-track" style="writing-mode: vertical-rl;">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="first-track">Some larger words in this sentence</div>
+    <div class="second-track">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008-ref.html
new file mode 100644
index 00000000000..eb4ab2365c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008-ref.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(3, 100px);
+    grid-template-columns: repeat(3, 100px);
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    writing-mode: vertical-rl;
+    margin-top: 10px;
+    width: fit-content;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+    width: max-content;
+    grid-column: span 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    writing-mode: vertical-lr;
+    width: fit-content;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+    gap: 20px;
+    width: max-content;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry with explicit placement are correctly positioned within the grid axis and that the margins on the orthogonal items correctly affect track sizing.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="first-track">This is some text</div>
+      <div class="first-track" style="margin-right: 10px;">This is some text</div>
+      <div class="first-track" style="writing-mode: horizontal-tb; width: max-content;">This is some text</div>
+    </div>
+    <div class="second-track" style="margin-bottom: 10px;">Some larger words in this sentence</div>
+    <div class="flex" style="grid-row-start: 3;">
+      <div class="third-track">The cat cannot be separated from milk</div>
+      <div class="third-track">This is some other text</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html
new file mode 100644
index 00000000000..df35f88967f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/grid-placement/row-explicit-placement-008.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-explicit-placement-008-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 100px);
+    background: gray;
+    item-tolerance: 0;
+    height: 200px;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+    writing-mode: vertical-rl;
+    margin-top: 10px;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+    writing-mode: vertical-lr;
+}
+</style>
+<body>
+  <p>Test that orthoganal masonry with explicit placement are correctly positioned within the grid axis and that the margins on the orthogonal items correctly affect track sizing.</p>
+  <div class="masonry">
+    <div class="first-track">This is some text</div>
+    <div class="first-track" style="margin-right: 10px;">This is some text</div>
+    <div class="first-track" style="writing-mode: horizontal-tb">This is some text</div>
+    <div class="second-track" style="margin-bottom: 10px;">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+    <div class="third-track">This is some other text</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size-ref.html
new file mode 100644
index 00000000000..8b41ef60a0d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size-ref.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    gap: 20px;
+    padding: 20px;
+    align-items: start;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry containers are correctly sized when an intrinsic inline size is specified.</p>
+  <div class="grid" style="width: max-content">
+    <div class="first-track">This is some text</div>
+    <div class="second-track">Some larger words in this sentence</div>
+    <div class="third-track">The cat cannot be separated from milk</div>
+  </div>
+  <div class="grid" style="width: min-content">
+    <div class="first-track" style="height: fit-content;">This is some text</div>
+    <div class="second-track" style="height: fit-content;">Some larger words in this sentence</div>
+    <div class="third-track" style="height: fit-content;">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html
new file mode 100644
index 00000000000..c82c8fa3f50
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/column-intrinsic-inline-container-size.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-intrinsic-inline-container-size-ref.html">
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    gap: 20px;
+    padding: 20px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-column-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-column-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-column-start: 3;
+}
+</style>
+<body>
+  <p>Test that masonry containers are correctly sized when an intrinsic inline size is specified.</p>
+  <div class="masonry" style="width: max-content">
+    <div class="first-track" style="width: max-content">This is some text</div>
+    <div class="second-track" style="width: max-content">Some larger words in this sentence</div>
+    <div class="third-track" style="width: max-content">The cat cannot be separated from milk</div>
+  </div>
+  <div class="masonry" style="width: min-content">
+    <div class="first-track" style="width: min-content">This is some text</div>
+    <div class="second-track" style="width: min-content">Some larger words in this sentence</div>
+    <div class="third-track" style="width: min-content">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-auto.html
index 50a986b1fa8..b4b2eb4ec3e 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html
index 5da4059e139..6cf0a1d96b6 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr 1fr 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix1.html
index 4fc437e1050..0ec4dccfb8e 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr min-content max-content;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix2.html
index f4ccd1fc769..d89436ec937 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-001-mix2.html
@@ -14,12 +14,10 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-columns: 1.1ch auto 1.4ch 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-auto.html
index d2b0984a9f4..0d17353a743 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-fr.html
index edf5bd1cf6b..c5f3b2a3504 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr 1fr 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix1.html
index 1342367dbc4..880c0c05443 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr min-content max-content;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix2.html
index e275999acaf..f508f715cdb 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-002-mix2.html
@@ -14,12 +14,10 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-columns: 1.1ch auto 1.4ch 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-auto.html
index 4e270382b7b..9a23714fa60 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-fr.html
index e6009008c51..1f7b635775e 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
-  display: inline-grid;
+  display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr 1fr 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix1.html
index e2802b82833..5e0640bb546 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr min-content max-content;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix2.html
index aeccea1c1dd..94358b2d9b8 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-003-mix2.html
@@ -14,12 +14,10 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-columns: 1.1ch auto 1.4ch 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-auto.html
index 71dd2f5357b..ac1064c340f 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html
index 30c066a412b..64864e50ca4 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr 1fr 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix1.html
index a2cdb2ca7ea..2c5e1089d2b 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: 1fr 2fr min-content max-content;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix2.html
index 9784824c36c..38c49a32103 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-004-mix2.html
@@ -14,12 +14,10 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-columns: 1.1ch auto 1.4ch 1fr;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-005.html
index 5d15869b120..ac9cbc0d740 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-005.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-005.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,auto);
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-006.html
index e28ad246129..4a3fa347751 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-006.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-006.html
@@ -14,10 +14,8 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html
index 2f6550a102d..004efaf7f68 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-cols-007.html
@@ -14,10 +14,8 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
-  grid-template-rows: masonry;
   border: 1px solid;
   padding: 0 1px 0 2px;
   vertical-align: top;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-auto.html
index 505e040306b..6f5a4678b5d 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-fr.html
index d9fc78532e2..e84eaccc13a 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr 1fr 1fr;
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix1.html
index 9b6bae39a69..a25543dc5c9 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr min-content max-content;
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix2.html
index 3276adec58e..89ddb7f0478 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-001-mix2.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-rows: 1.1ch auto 1.4ch 1fr;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-auto.html
index f2031e38baa..a019b8a82d9 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-auto.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-fr.html
index d37fd70841a..8cba66c90fb 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-fr.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr 1fr 1fr;
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix1.html
index 6b126ed1e9e..3cef0ecb799 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix1.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr min-content max-content;
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix2.html
index 557c9a2edf3..b337383f63a 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-002-mix2.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-rows: 1.1ch auto 1.4ch 1fr;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-auto.html
index eaf5efb6d4b..b917aa69502 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-auto.html
@@ -15,11 +15,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-fr.html
index 6eb528ab1a7..d6c4f702177 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-fr.html
@@ -15,11 +15,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr 1fr 1fr;
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix1.html
index 2161777ccc7..b84d1264296 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix1.html
@@ -15,11 +15,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr min-content max-content;
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix2.html
index 3a742fb8831..64dac96a19b 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-003-mix2.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-rows: 1.1ch auto 1.4ch 1fr;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-auto.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-auto.html
index 4caf2493e5e..7da65b9d343 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-auto.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-auto.html
@@ -15,11 +15,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-fr.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-fr.html
index ce993120161..ef31288b1c1 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-fr.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-fr.html
@@ -15,10 +15,8 @@
 
 grid {
   display: inline-grid;
-  display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr 1fr 1fr;
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix1.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix1.html
index 80d8b78c9b0..8b82714a319 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix1.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix1.html
@@ -15,11 +15,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: 1fr 2fr min-content max-content;
   border: 1px solid;
   padding: 1px 0 2px 0;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix2.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix2.html
index 20e5881684a..7a2a1a96655 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix2.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-004-mix2.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   /* keep fixed values small enough for spanners to have an effect */
   grid-template-rows: 1.1ch auto 1.4ch 1fr;
   border: 1px solid;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-005.html
index 54a9515069a..ae1d90aa847 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-005.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-005.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-006.html
index 8c1b3925a6a..a0079e5d9e1 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-006.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-006.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   gap: 1px 2px;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,auto);
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-007.html
index 6df944bce5b..e4abb488081 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-007.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/masonry-intrinsic-sizing-rows-007.html
@@ -14,11 +14,9 @@
 @import "support/masonry-intrinsic-sizing-visual.css";
 
 grid {
-  display: grid;
   display: masonry;
   masonry-direction: row;
   gap: 1rem 1rem;
-  grid-template-columns: masonry;
   grid-template-rows: repeat(4,100px);
   border: 1px solid;
   padding: 0 1px 0 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height-ref.html
new file mode 100644
index 00000000000..6ce0350cb7b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px 100px 100px;
+    align-items: start;
+    background: gray;
+    width: 300px;
+    height: 100px;
+    padding: 10px;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+    overflow: visible;
+    flex-wrap: nowrap;
+}
+
+.square-100x100 {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that the user-defined block size is used over the intrinsic block size when displaying background.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="square-100x100" style="background: lightskyblue;">
+        Number 1
+    </div>
+      <div class="square-100x100" style="background: lightpink;">
+        Number 4
+    </div>
+    <div style="background: brown; width: 100px; height: 200px;">
+      Number 4
+    </div>
+    </div>
+    <div class="flex">
+      <div class="square-100x100" style="background: lightcoral;">
+        Number 2
+    </div>
+      <div class="square-100x100" style="background: lightpink;">
+        Number 5
+    </div>
+    </div>
+    <div class="flex">
+      <div class="square-100x100" style="background: lightgreen;">
+        Number 3
+    </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html
new file mode 100644
index 00000000000..6f62b0f92da
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-defined-height.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-defined-height-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto;
+    width: 300px;
+    height: 100px;
+    padding: 10px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+
+.square-100x100 {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that the user-defined block size is used over the intrinsic block size when displaying background.</p>
+  <div class="masonry">
+    <div class="first-track square-100x100">
+      Number 1
+    </div>
+    <div class="second-track square-100x100">
+      Number 2
+    </div>
+    <div class="third-track square-100x100">
+      Number 3
+    </div>
+    <div class="square-100x100" style="background-color: lightpink;">
+      Number 4
+    </div>
+    <div class="square-100x100" style="background-color: lightpink;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; width: 100px;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size-ref.html
new file mode 100644
index 00000000000..29c8e8f8e8d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size-ref.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    align-items: start;
+}
+
+.flex {
+    display: flex;
+    flex-direction: column;
+    overflow: visible;
+    flex-wrap: nowrap;
+}
+
+.max-content-item {
+    width: max-content;
+    height: 20px;
+}
+</style>
+<body>
+  <p>Test that masonry containers are correctly sized when an intrinsic inline size is specified.</p>
+  <div class="grid" style="width: max-content">
+    <div class="flex">
+      <div class="first-track max-content-item">This is some text</div>
+      <div class="second-track max-content-item">Some larger words in this sentence</div>
+      <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+    </div>
+  </div>
+  <div class="grid" style="width: max-content">
+    <div class="flex">
+      <div class="first-track max-content-item">This is some text</div>
+      <div class="second-track max-content-item">Some larger words in this sentence</div>
+      <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+    </div>
+  </div>
+  <div class="grid">
+    <div class="flex">
+      <div class="first-track max-content-item">This is some text</div>
+      <div class="second-track max-content-item">Some larger words in this sentence</div>
+      <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size.html b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size.html
new file mode 100644
index 00000000000..3f5ee404a90
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/intrinsic-sizing/row-intrinsic-inline-container-size.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link href="resources/masonry.css" rel="stylesheet">
+<link rel="match" href="row-intrinsic-inline-container-size-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 20px);
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+}
+
+.max-content-item {
+    width: max-content;
+    height: 20px;
+}
+</style>
+<body>
+  <p>Test that masonry containers are correctly sized when an intrinsic inline size is specified.</p>
+  <div class="masonry" style="width: max-content;">
+    <div class="first-track max-content-item">This is some text</div>
+    <div class="second-track max-content-item">Some larger words in this sentence</div>
+    <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+  </div>
+  <div class="masonry" style="width: min-content;">
+    <div class="first-track max-content-item">This is some text</div>
+    <div class="second-track max-content-item">Some larger words in this sentence</div>
+    <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+  </div>
+  <div class="masonry">
+    <div class="first-track max-content-item">This is some text</div>
+    <div class="second-track max-content-item">Some larger words in this sentence</div>
+    <div class="third-track max-content-item">The cat cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001-ref.html
new file mode 100644
index 00000000000..b3e25fed55e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001-ref.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: 100px 100px 100px;
+    width: 340px;
+    gap: 20px;
+    padding: 20px;
+    align-items: start;
+}
+
+.flex {
+    display: flex;
+    flex-direction: column;
+    overflow: visible;
+    flex-wrap: nowrap;
+    gap: 20px;
+}
+
+.grid-auto-item-1 {
+    background: lightskyblue;
+    padding: 10px;
+}
+
+.grid-auto-item-2 {
+    background: lightcoral;
+    padding: 10px;
+}
+
+.grid-auto-item-3 {
+    background: lightgreen;
+    padding: 10px;
+}
+
+.grid-auto-item-4 {
+    background: lightpink;
+    padding: 10px;
+    width: 200%;
+    transform: translateX(-120px);
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="grid-auto-item-1" style="grid-column: 1">This is some text</div>
+    </div>
+    <div class="flex">
+      <div class="grid-auto-item-2" style="grid-column: 2">Some larger words in this sentence</div>
+      <div class="grid-auto-item-4" style="grid-column: 2">The cat still cannot be separated from milk</div>
+      <div class="grid-auto-item-4" style="grid-column: 2">The cat still cannot be separated from milk</div>
+    </div>
+    <div class="flex">
+      <div class="grid-auto-item-3" style="grid-column: 3">The cat cannot be separated from milk</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html
new file mode 100644
index 00000000000..94a3c5c6c4f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/column-auto-placement-001.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-placement-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: auto auto auto;
+    width: 340px;
+    padding: 20px;
+    gap: 20px;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.two-track-spanner {
+    background: lightpink;
+    grid-column: span 2;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="auto-item">This is some text</div>
+    <div class="auto-item">Some larger words in this sentence</div>
+    <div class="auto-item">The cat cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001-ref.html
new file mode 100644
index 00000000000..ab16ec39bb4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001-ref.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<style>
+html,body {
+    font:15px/1 monospace;
+}
+.grid {
+    display: grid;
+    position: relative;
+    grid-template-columns: repeat(3, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly in masonry.</p>
+  <div class="grid">
+    <div>
+      <div style="background: lightskyblue; height: 20px;" >
+        1
+      </div>
+      <div style="background: red; height: 40px;">
+        5
+      </div>
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 60px;">
+      3
+    </div>
+    <div>
+      <div style="background: brown; height: 15px; width: 100px;">
+        4
+      </div>
+      <div style="background: yellow; height: 40px;">
+        7
+      </div>
+    </div>
+    <div style="background: pink; height: 45px; grid-column: 3;">
+      6
+    </div>
+    <div style="background: brown; height: 60px; grid-column: 2 / span 2; margin-top: -10px;">
+      8
+    </div>
+    <div style="margin-top: 15px;">
+      <div style="background: blueviolet; height: 12px; grid-column: 2; margin-top: 3px;">
+        9
+      </div>
+      <div style="background: orange; height: 15px; grid-column: 2;">
+        10
+      </div>
+    </div>
+    <div style="background: pink; height: 20px; width: 150px; transform: translateY(50px);">
+      11
+    </div>
+    <div style="background: green; height: 60px; transform: translateY(20px);">
+      14
+    </div>
+    <div style="background: brown; height: 60px; width: 100px; transform: translateY(20px);">
+      12
+    </div>
+    <div style="background: pink; height: 20px; width: 150px; transform: translateY(20px); grid-column-start: 1">
+      13
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html
new file mode 100644
index 00000000000..a56658e0e9b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-001.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+    font:15px/1 monospace;
+}
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly in masonry.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 60px;">
+      3
+    </div>
+    <div style="background: brown; height: 15px; grid-column: span 2;">
+      4
+    </div>
+    <div style="background: red; height: 40px;">
+      5
+    </div>
+    <div style="background: pink; height: 45px;">
+      6
+    </div>
+    <div style="background: yellow; height: 40px;">
+      7
+    </div>
+    <div style="background: brown; height: 60px; grid-column: span 2;">
+      8
+    </div>
+    <div style="background: blueviolet; height: 12px; grid-column: 2; margin-top: 3px;">
+      9
+    </div>
+    <div style="background: orange; height: 15px; grid-column: 2;">
+      10
+    </div>
+    <div style="background: pink; height: 20px; grid-column: span 3;">
+      11
+    </div>
+    <div style="background: brown; height: 60px; grid-column: 2 / span 2;">
+      12
+    </div>
+    <div style="background: pink; height: 20px; grid-column: span 3;">
+      13
+    </div>
+    <div style="background: green; height: 60px;">
+      14
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002-ref.html
new file mode 100644
index 00000000000..d7ee1a8e6cd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-columns: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly based on the auto-placement cursor location when there are multiple gaps. Item 5 should go into the right-most gap.</p>
+  <div class="grid">
+    <div>
+      <div style="background: lightskyblue; height: 20px;" >
+        1
+      </div>
+      <div style="background: red; height: 40px;">
+        6
+      </div>
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 20px;">
+      3
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 3;">
+      4
+    </div>
+    <div style="background:orchid; height: 10px; grid-column: span 2;">
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html
new file mode 100644
index 00000000000..86b12fa5309
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-002.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-002-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly based on the auto-placement cursor location when there are multiple gaps. Item 5 should go into the right-most gap.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 20px;">
+      3
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 3;">
+      4
+    </div>
+    <div style="background:orchid; height: 10px; grid-column: span 2;">
+      5
+    </div>
+    <div style="background: red; height: 40px;">
+      6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003-ref.html
new file mode 100644
index 00000000000..8258e58dbed
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    width: 170px;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing has no impact when all items are single-spanning.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 60px;">
+      3
+    </div>
+    <div style="background: brown; height: 15px;">
+      4
+    </div>
+    <div style="background: red; height: 40px;">
+      5
+    </div>
+    <div style="background: pink; height: 40px;">
+      6
+    </div>
+    <div style="background: yellow; height: 40px;">
+      7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003.html
new file mode 100644
index 00000000000..aa5bfd08010
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-003.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-003-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    width: 170px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing has no impact when all items are single-spanning.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 60px;">
+      3
+    </div>
+    <div style="background: brown; height: 15px;">
+      4
+    </div>
+    <div style="background: red; height: 40px;">
+      5
+    </div>
+    <div style="background: pink; height: 40px;">
+      6
+    </div>
+    <div style="background: yellow; height: 40px;">
+      7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004-ref.html
new file mode 100644
index 00000000000..44a17aad34c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-columns: 30px 40px 50px 30px;
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure dense-packing only places items into gaps where the track size is the same as where the item would have been laid out WITHOUT dense packing.</p>
+  <div class="grid">
+    <div style="background: lightskyblue; height: 40px; grid-column: 1" >
+     1
+    </div>
+    <div style="background: lightgreen; height: 40px; grid-column: 3">
+      2
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 4;">
+      3
+    </div>
+    <div style="background: red; height: 40px; width: 30px; grid-column: 4;">
+      4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html
new file mode 100644
index 00000000000..2c261fe69dd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-004.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-004-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: 30px 40px 50px 30px;
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure dense-packing only places items into gaps where the track size is the same as where the item would have been laid out WITHOUT dense packing.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 40px; grid-column: 1" >
+      1
+    </div>
+    <div style="background: lightgreen; height: 40px; grid-column: 3">
+      2
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 4;">
+      3
+    </div>
+    <div style="background: red; height: 40px; width: 30px;">
+      4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005-ref.html
new file mode 100644
index 00000000000..6e64d0ed463
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005-ref.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    position: relative;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    grid-template-rows: masonry;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that we always pick the highest eligible opening; auto-placement cursor should only be a tie-breaker with openings at the same location.</p>
+  <div class="grid">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px;" >
+      2
+    </div>
+    <div style="background: yellow; height: 20px;" >
+      6
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      3
+    </div>
+    <div style="background: lightsteelblue; height: 20px; grid-column: 2 / span 2;" >
+      4
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html
new file mode 100644
index 00000000000..3d7643b799b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-005.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-005-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that we always pick the highest eligible opening; auto-placement cursor should only be a tie-breaker with openings at the same location.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px;" >
+      2
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      3
+    </div>
+    <div style="background: lightsteelblue; height: 20px; grid-column: 2 / span 2;" >
+      4
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      5
+    </div>
+    <div style="background: yellow; height: 20px;" >
+      6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006-ref.html
new file mode 100644
index 00000000000..8b666fa6323
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(4, 50px);
+}
+.upwards {
+    transform: translateY(-20px);
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with a specified track into track openings in that same specified track.</p>
+  <div class="grid">
+    <div style="background: brown; height: 20px;"></div>
+    <div style="background: brown; height: 40px; grid-column: 2;"></div>
+    <div style="background: pink; height: 20px; grid-column-start: 3;"></div>
+    <div style="background: brown; height: 60px; grid-column-start: 4;"></div>
+    <div class="upwards" style="background: brown; height: 20px; grid-column: span 2;"></div>
+    <div class="upwards" style="background: brown; height: 20px; grid-column: span 4;"></div>
+    <div class="upwards" style="background: brown; height: 20px; grid-column: span 3;"></div>
+    <div class="upwards" style="background: yellow; height: 20px; grid-column-start: 4;"></div>
+    <div class="upwards" style="background: brown; height: 20px; grid-column: span 4;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html
new file mode 100644
index 00000000000..be491f6b22d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-006.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-006-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with a specified track into track openings in that same specified track.</p>
+  <div class="masonry">
+    <div style="background: brown; height: 20px;"></div>
+    <div style="background: brown; height: 40px;"></div>
+    <div style="background: brown; height: 60px; grid-column-start: 4;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 2;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 4;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 3;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 4;"></div>
+    <div style="background: yellow; height: 20px; grid-column-start: 4;"></div>
+    <div style="background: pink; height: 20px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001-ref.html
new file mode 100644
index 00000000000..c00b9716de9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item should be placed in track opening.</p>
+  <div class="grid">
+    <div style="background: lightskyblue; height: 70px;" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px; grid-column: 4;" >
+      2
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: 3 / span 2; transform: translateY(-50px);">
+      3
+    </div>
+    <div style="background: lightsteelblue; height: 20px; grid-column: span 4; transform: translateY(-20px);" >
+      4
+    </div>
+    <div style="background: yellow; height: 10px; grid-column: span 2;" >
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html
new file mode 100644
index 00000000000..68926375e73
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item should be placed in track opening.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 70px;" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px; grid-column: 4;" >
+      2
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: 3 / span 2;">
+      3
+    </div>
+    <div style="background: lightsteelblue; height: 20px; grid-column: span 4;" >
+      4
+    </div>
+    <div style="background: yellow; height: 10px; grid-column: span 2;" >
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002-ref.html
new file mode 100644
index 00000000000..2593347e89a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 10px 10px 20px 15px 5px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items are placed into tracks with the same used size and the same number of tracks, and priority is given to tracks closest (but after) the auto-placement cursor.</p>
+  <div class="grid">
+    <div style="background: yellow; height: 20px; width: 20px; grid-column: 1" >
+      4
+    </div>
+    <div style="background: lightskyblue; height: 20px; grid-column: 3" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px; grid-column: span 5" >
+      2
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      3
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html
new file mode 100644
index 00000000000..5b0a55b94bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-002.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-002-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: 10px 10px 20px 15px 5px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items are placed into tracks with the same used size and the same number of tracks, and priority is given to tracks closest (but after) the auto-placement cursor.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px; grid-column: 3" >
+      1
+    </div>
+    <div style="background: lightblue; height: 20px; grid-column: span 5" >
+      2
+    </div>
+    <div style="background: darkblue; height: 20px; grid-column: span 3;">
+      3
+    </div>
+    <div style="background: yellow; height: 20px; grid-column: span 2;" >
+      4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003-ref.html
new file mode 100644
index 00000000000..1eb62b3e978
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items that span more than 1 track correctly into gaps.</p>
+  <div class="grid">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 20px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 40px;">
+      3
+    </div>
+    <div style="background:orchid; height: 10px; grid-column: span 2; transform: translateY(-20px);">
+      5
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 3; transform: translateY(-10px);">
+      4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html
new file mode 100644
index 00000000000..8c0ac31c293
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-003.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-003-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items that span more than 1 track correctly into gaps.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; height: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; height: 20px;" >
+      2
+    </div>
+    <div style="background: lightgreen; height: 40px;">
+      3
+    </div>
+    <div style="background: brown; height: 10px; grid-column: span 3;">
+      4
+    </div>
+    <div style="background:orchid; height: 10px; grid-column: span 2;">
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004-ref.html
new file mode 100644
index 00000000000..e2b1de49611
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(5, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items follows the masonry dense packing algorithm.</p>
+  <div class="grid">
+    <div style="background: brown; height: 80px;"></div>
+    <div style="background: brown; height: 60px;"></div>
+    <div style="background: brown; height: 40px;"></div>
+    <div style="background: brown; height: 30px;"></div>
+    <div style="background: brown; height: 20px;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 5;"></div>
+    <div style="background: pink; height: 30px; grid-column: span 4;">Item that should not end up in gap.</div>
+    <div style="background: yellow; height: 20px; grid-column: span 4; transform: translate(50px, -70px);">Item that should end up in gap.</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html
new file mode 100644
index 00000000000..677870b101b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-004.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-004-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(5, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items follows the masonry dense packing algorithm.</p>
+  <div class="masonry">
+    <div style="background: brown; height: 80px;"></div>
+    <div style="background: brown; height: 60px;"></div>
+    <div style="background: brown; height: 40px;"></div>
+    <div style="background: brown; height: 30px;"></div>
+    <div style="background: brown; height: 20px;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 5;"></div>
+    <div style="background: pink; height: 30px; grid-column: span 4;">Item that should not end up in gap.</div>
+    <div style="background: yellow; height: 20px; grid-column: span 4;">Item that should end up in gap.</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005-ref.html
new file mode 100644
index 00000000000..9eaff358540
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(10001, 5px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that stack overflow does not occur for dense-packing for masonry with 10,000 tracks</p>
+  <div class="grid">
+    <div style="background: pink; height: 20px;"></div>
+    <div style="background: red; height: 20px; grid-column: span 10001;"></div>
+    <div style="background: yellow; height: 20px; grid-column: span 10000;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html
new file mode 100644
index 00000000000..d08814bc9e5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-005.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-005-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(10001, 5px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that stack overflow does not occur for dense-packing for masonry with 10,000 tracks</p>
+  <div class="masonry">
+    <div style="background: pink; height: 20px;"></div>
+    <div style="background: red; height: 20px; grid-column: span 10001;"></div>
+    <div style="background: yellow; height: 20px; grid-column: span 10000;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006-ref.html
new file mode 100644
index 00000000000..410a56b09e4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(4, 50px);
+    width: 170px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing correctly iterates through all possible track openings to find an opening span. Item that should be placed into opening is yellow.</p>
+  <div class="grid">
+    <div style="background: aquamarine; height: 60px;" >
+      1
+    </div>
+    <div style="background: blue; height: 40px;" >
+      2
+    </div>
+    <div style="background: blueviolet; height: 20px;">
+      3
+    </div>
+    <div style="background: lightblue; height: 10px; grid-column: 1 / span 2;">
+      4
+    </div>
+    <div style="background: lightskyblue; grid-column: 1; height: 30px;">
+      5
+    </div>
+    <div style="background: lightsteelblue; height: 60px; grid-column: 4;">
+      6
+    </div>
+    <div style="background: aqua; height: 20px; grid-column: span 4;">
+      7
+    </div>
+    <div style="background: yellow; height: 10px; grid-column: span 3;">
+      8
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html
new file mode 100644
index 00000000000..afb9cc096f4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-006.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-006-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px);
+    width: 170px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing correctly iterates through all possible track openings to find an opening span. Item that should be placed into opening is yellow.</p>
+  <div class="masonry">
+    <div style="background: aquamarine; height: 60px;" >
+      1
+    </div>
+    <div style="background: blue; height: 40px;" >
+      2
+    </div>
+    <div style="background: blueviolet; height: 20px;">
+      3
+    </div>
+    <div style="background: lightblue; height: 10px; grid-column: 1 / span 2;">
+      4
+    </div>
+    <div style="background: lightskyblue; grid-column: 1; height: 30px;">
+      5
+    </div>
+    <div style="background: lightsteelblue; height: 60px; grid-column: 4;">
+      6
+    </div>
+    <div style="background: aqua; height: 20px; grid-column: span 4;">
+      7
+    </div>
+    <div style="background: yellow; height: 10px; grid-column: span 3;">
+      8
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007-ref.html
new file mode 100644
index 00000000000..b47becd463c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(5, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry properly handles "split" track openings.</p>
+  <div class="grid">
+    <div style="background: brown; height: 80px;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 2"></div>
+    <div style="background: brown; height: 40px;"></div>
+    <div style="background: brown; height: 100px;"></div>
+    <div style="background: brown; height: 10px; grid-column: span 5;"></div>
+    <div style="background: pink; height: 10px; grid-column: span 4; transform: translateY(-30px);"></div>
+    <div style="background: lightgreen; height: 10px; grid-column: 2 / span 2; transform: translateY(-100px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html
new file mode 100644
index 00000000000..eb72bbf262b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-007.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-007-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(5, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry properly handles "split" track openings.</p>
+  <div class="masonry">
+    <div style="background: brown; height: 80px;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 2"></div>
+    <div style="background: brown; height: 40px;"></div>
+    <div style="background: brown; height: 100px;"></div>
+    <div style="background: brown; height: 10px; grid-column: span 5;"></div>
+    <div style="background: pink; height: 10px; grid-column: span 4;"></div>
+    <div style="background: lightgreen; height: 10px; grid-column: span 2;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008-ref.html
new file mode 100644
index 00000000000..822b18d5a0e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(4, 50px);
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with specified tracks into track openings in those same specified tracks.</p>
+  <div class="grid">
+    <div style="background: brown; height: 20px; grid-column: span 2; grid-row: 1;"></div>
+    <div style="background: darkgoldenrod; height: 20px; grid-column: span 4;"></div>
+    <div style="background: tan; height: 40px; grid-column: 3 / span 2;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 4;"></div>
+    <div style="background: yellow; height: 20px; grid-column: 1 / span 2; grid-row: 3;"></div>
+    <div style="background: pink; height: 20px; grid-column: span 2; grid-row: 1;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html
new file mode 100644
index 00000000000..16caba4aa78
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/column-dense-packing-multi-span-008.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-dense-packing-multi-span-008-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with specified tracks into track openings in those same specified tracks.</p>
+  <div class="masonry">
+    <div style="background: brown; height: 20px; grid-column: span 2;"></div>
+    <div style="background: darkgoldenrod; height: 20px; grid-column: span 4;"></div>
+    <div style="background: tan; height: 40px; grid-column: 3 / span 2;"></div>
+    <div style="background: brown; height: 20px; grid-column: span 4;"></div>
+    <div style="background: yellow; height: 20px; grid-column: 1 / span 2;"></div>
+    <div style="background: pink; height: 20px; grid-column: span 2;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001-ref.html
new file mode 100644
index 00000000000..e5bb67bebcf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001-ref.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-rows: repeat(3, 50px);
+    width: 170px;
+    grid-auto-flow: dense;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly in masonry.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; width: 20px;" >
+        1
+      </div>
+      <div style="background: red; width: 40px;">
+        5
+      </div>
+      <div style="background: brown; width: 10px; height: 100px;">
+        4
+      </div>
+      <div style="background: yellow; width: 40px;">
+        7
+      </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightcoral; width: 60px;" >
+        2
+      </div>
+      <div style="background: brown; width: 10px;"></div>
+      <div style="background: blueviolet; width: 12px; grid-row: 2; margin-left: 3px;">
+        9
+      </div>
+      <div style="background: orange; width: 20px; grid-row: 2;">
+        10
+      </div>
+      <div style="background: brown; width: 10px; grid-row: span 2;">
+        8
+      </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightgreen; width: 60px;">
+        3
+      </div>
+      <div style="background: pink; width: 45px;">
+        6
+      </div>
+      <div style="background: brown; width: 10px;"></div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html
new file mode 100644
index 00000000000..485fec12ad3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-001.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 50px);
+    width: 170px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly in masonry.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 20px;" >
+     1
+    </div>
+    <div style="background: lightcoral; width: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; width: 60px;">
+      3
+    </div>
+    <div style="background: brown; width: 10px; grid-row: span 2;">
+      4
+    </div>
+    <div style="background: red; width: 40px;">
+      5
+    </div>
+    <div style="background: pink; width: 45px;">
+      6
+    </div>
+    <div style="background: yellow; width: 40px;">
+      7
+    </div>
+    <div style="background: brown; width: 10px; grid-row: span 2;">
+      8
+    </div>
+    <div style="background: blueviolet; width: 12px; grid-row: 2; margin-left: 3px;">
+      9
+    </div>
+    <div style="background: orange; width: 20px; grid-row: 2;">
+      10
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002-ref.html
new file mode 100644
index 00000000000..34d62268205
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002-ref.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-rows: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly based on the auto-placement cursor location when there are multiple gaps. Item 5 should go into the bottom-most gap.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; width: 20px;" >
+        1
+      </div>
+      <div style="background: red; width: 40px;">
+        6
+      </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightcoral; width: 60px;" >
+        2
+      </div>
+      <div style="background: brown; width: 10px; height: 150px; transform: translateY(-50px);">
+        4
+      </div>
+      <div style="background:orchid; width: 10px; height: 100px; transform: translateY(-50px);">
+        5
+      </div>
+    </div>
+    <div style="background: lightgreen; width: 20px;">
+      3
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html
new file mode 100644
index 00000000000..7cffe275611
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-002.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-002-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items correctly based on the auto-placement cursor location when there are multiple gaps. Item 5 should go into the bottom-most gap.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 20px;" >
+     1
+    </div>
+    <div style="background: lightcoral; width: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; width: 20px;">
+      3
+    </div>
+    <div style="background: brown; width: 10px; grid-row: span 3;">
+      4
+    </div>
+    <div style="background:orchid; width: 10px; grid-row: span 2;">
+      5
+    </div>
+    <div style="background: red; width: 40px;">
+      6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003-ref.html
new file mode 100644
index 00000000000..366571d9557
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003-ref.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    position: relative;
+    grid-template-rows: repeat(3, 50px);
+    grid-auto-flow: dense;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing does not affect the layout when all items are single-spanning.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; width: 20px;" >
+        1
+      </div>
+      <div style="background: brown; width: 10px;">
+        4
+      </div>
+      <div style="background: red; width: 40px;">
+        5
+      </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightcoral; width: 60px;" >
+        2
+      </div>
+      <div style="background: pink; width: 40px;">
+        6
+      </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightgreen; width: 60px;">
+        3
+      </div>
+      <div style="background: yellow; width: 40px;">
+        7
+      </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html
new file mode 100644
index 00000000000..eb27bdf23e6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-003.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-003-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing does not affect the layout when all items are single-spanning.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 20px;" >
+     1
+    </div>
+    <div style="background: lightcoral; width: 60px;" >
+      2
+    </div>
+    <div style="background: lightgreen; width: 60px;">
+      3
+    </div>
+    <div style="background: brown; width: 10px;">
+      4
+    </div>
+    <div style="background: red; width: 40px;">
+      5
+    </div>
+    <div style="background: pink; width: 40px;">
+      6
+    </div>
+    <div style="background: yellow; width: 40px;">
+      7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004-ref.html
new file mode 100644
index 00000000000..f3b2bbfed42
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(4, 50px);
+    grid-template-columns: repeat(4, 40px);
+    grid-auto-flow: column;
+}
+.upwards {
+    transform: translateX(-20px);
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with a specified track into track openings in that same specified track.</p>
+  <div class="grid">
+    <div style="background: brown; width: 20px;"></div>
+    <div style="background: brown; width: 40px;"></div>
+    <div style="background: pink; width: 20px;"></div>
+    <div style="background: brown; width: 60px;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 2;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4; transform: translateX(-20px);"></div>
+    <div style="background: brown; width: 20px; grid-row: span 3; transform: translateX(-40px);"></div>
+    <div style="background: yellow; width: 20px; grid-row-start: 4; transform: translateX(-40px);"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4; transform: translateX(-60px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html
new file mode 100644
index 00000000000..8c6211cc6da
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-004.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-004-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with a specified track into track openings in that same specified track.</p>
+  <div class="masonry">
+    <div style="background: brown; width: 20px;"></div>
+    <div style="background: brown; width: 40px;"></div>
+    <div style="background: brown; width: 60px; grid-row-start: 4;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 2;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 3;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4;"></div>
+    <div style="background: yellow; width: 20px; grid-row-start: 4;"></div>
+    <div style="background: pink; width: 20px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001-ref.html
new file mode 100644
index 00000000000..59f8212f5c1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item is the item that should be placed in track opening.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; width: 70px;" >
+        1
+      </div>
+      <div style="background: lightsteelblue; width: 20px; height: 200px;" >
+        4
+      </div>
+    </div>
+    <div style="background: yellow; width: 10px; grid-row: span 2;" >
+      5
+    </div>
+    <div class="flex">
+      <div style="background: lightblue; width: 20px; grid-row: 4;" >
+        2
+      </div>
+      <div style="background: darkblue; width: 20px; height: 100px; grid-row: 3; transform: translateY(-50px);">
+        3
+      </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html
new file mode 100644
index 00000000000..eb20a63d492
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-001.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-multi-span-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item is the item that should be placed in track opening.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 70px;" >
+      1
+    </div>
+    <div style="background: lightblue; width: 20px; grid-row: 4;" >
+      2
+    </div>
+    <div style="background: darkblue; width: 20px; grid-row: 3 / span 2;">
+      3
+    </div>
+    <div style="background: lightsteelblue; width: 20px; grid-row: span 4;" >
+      4
+    </div>
+    <div style="background: yellow; width: 10px; grid-row: span 2;" >
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002-ref.html
new file mode 100644
index 00000000000..7b09a2d70c4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 10px 10px 20px 15px 5px;
+    grid-auto-flow: column;
+}
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items are placed into tracks with the same used size and the same number of tracks, and priority is given to tracks closest after the auto-placement cursor.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: yellow; width: 20px; height: 20px;" >
+        4
+      </div>
+      <div style="background: lightblue; width: 20px; height: 60px;" >
+        2
+      </div>
+      <div style="background: darkblue; width: 20px; height: 40px;">
+        3
+      </div>
+    </div>
+    <div style="background: lightskyblue; width: 20px; height: 20px; transform: translateY(10px);" >
+      1
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html
new file mode 100644
index 00000000000..588eb989b4e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-002.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-multi-span-002-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: 10px 10px 20px 15px 5px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing with multi-span items are placed into tracks with the same used size and the same number of tracks, and priority is given to tracks closest after the auto-placement cursor.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 20px; grid-row: 3" >
+      1
+    </div>
+    <div style="background: lightblue; width: 20px; grid-row: span 5" >
+      2
+    </div>
+    <div style="background: darkblue; width: 20px; grid-row: span 3;">
+      3
+    </div>
+    <div style="background: yellow; width: 20px; grid-row: span 2;" >
+      4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003-ref.html
new file mode 100644
index 00000000000..8c6154c5e4f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+.flex {
+    display: flex;
+    flex-direction: row;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items that span more than 1 track correctly into gaps.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; width: 20px;" >
+        1
+      </div>
+      <div style="background:orchid; width: 10px; height: 100px;">
+        5
+      </div>
+    </div>
+    <div style="background: lightcoral; width: 20px;" >
+      2
+    </div>
+    <div class="flex">
+      <div style="background: lightgreen; width: 40px;">
+        3
+      </div>
+      <div style="background: brown; width: 10px; height: 150px; transform: translateY(-100px);">
+        4
+      </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html
new file mode 100644
index 00000000000..337e8791419
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-003.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-multi-span-003-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(3, 50px);
+    padding: 10px;
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing places items that span more than 1 track correctly into gaps.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue; width: 20px;" >
+      1
+    </div>
+    <div style="background: lightcoral; width: 20px;" >
+      2
+    </div>
+    <div style="background: lightgreen; width: 40px;">
+      3
+    </div>
+    <div style="background: brown; width: 10px; grid-row: span 3;">
+      4
+    </div>
+    <div style="background:orchid; width: 10px; grid-row: span 2;">
+      5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004-ref.html
new file mode 100644
index 00000000000..adf3fd39b59
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(4, 50px);
+    grid-template-columns: repeat(2, 20px) 40px repeat(2, 20px);
+    grid-auto-flow: column;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with specified tracks into track openings in those same specified tracks.</p>
+  <div class="grid">
+    <div style="background: brown; width: 20px; grid-row: span 2;"></div>
+    <div style="background: pink; width: 20px; grid-row: span 2;"></div>
+    <div style="background: darkgoldenrod; width: 20px; grid-row: span 4;"></div>
+    <div style="background: yellow; width: 20px; grid-row: 1 / span 2;"></div>
+    <div style="background: tan; width: 40px; grid-row: 3 / span 2;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html
new file mode 100644
index 00000000000..d667563036c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/dense-packing/row-dense-packing-multi-span-004.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-dense-packing-multi-span-004-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(4, 50px);
+    grid-auto-flow: dense;
+}
+</style>
+<body>
+  <p>Ensure that dense-packing in masonry only places items with specified tracks into track openings in those same specified tracks.</p>
+  <div class="masonry">
+    <div style="background: brown; width: 20px; grid-row: span 2;"></div>
+    <div style="background: darkgoldenrod; width: 20px; grid-row: span 4;"></div>
+    <div style="background: tan; width: 40px; grid-row: 3 / span 2;"></div>
+    <div style="background: brown; width: 20px; grid-row: span 4;"></div>
+    <div style="background: yellow; width: 20px; grid-row: 1 / span 2;"></div>
+    <div style="background: pink; width: 20px; grid-row: span 2;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance-ref.html
new file mode 100644
index 00000000000..16ae4eb0b9e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, 1fr);
+    gap: 20px;
+    padding: 20px;
+    width: 400px;
+}
+
+.flex {
+  display: flex;
+  flex-direction: column;
+  gap: 20px;
+}
+</style>
+<body>
+  <p>Test that the initial tie threshold for masonry is correctly resolved.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue; height: 100px"></div>
+      <div style="background: lightgreen; height: 50px"></div>
+    </div>
+    <div class="flex">
+      <div style="background: lightcoral; height: 50px"></div>
+      <div style="background: palegoldenrod; height: 100px"></div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html
new file mode 100644
index 00000000000..1836a25af3e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-initial-item-tolerance.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Initial value of item-tolerance</title>
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#item-slack">
+<link rel="match" href="column-initial-item-tolerance-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    font: 50px/1 Ahem;
+    grid-template-columns: repeat(2, 1fr);
+    item-tolerance: initial;
+    gap: 20px;
+    padding: 20px;
+    width: 400px;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.auto-item:nth-of-type(4) {
+    background: palegoldenrod;
+}
+</style>
+<body>
+  <p>Test that the initial tie threshold for masonry is correctly resolved.</p>
+  <div class="masonry">
+    <div class="auto-item" style="height: 80px"></div>
+    <div class="auto-item" style="height: 30px"></div>
+    <div class="auto-item" style="height: 30px"></div>
+    <div class="auto-item" style="height: 80px"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite-ref.html
new file mode 100644
index 00000000000..5dd29504641
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite-ref.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    font: 15px/1 Ahem;
+    grid-template-columns: repeat(4, 1fr);
+    gap: 20px;
+    padding: 20px;
+    width: 380px;
+}
+
+.auto-item {
+    padding: 10px;
+    width: 50px;
+    background: lightskyblue;
+}
+
+.flex {
+  gap: 20px;
+  display: flex;
+  flex-direction: column;
+}
+</style>
+<body>
+  <p>Test that the infinite tie threshold for masonry is correctly resolved.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="auto-item" style="height: 40px">1</div>
+      <div class="auto-item" style="height: 40px">5</div>
+      <div class="auto-item" style="height: 40px">9</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="height: 30px">2</div>
+      <div class="auto-item" style="height: 30px">6</div>
+      <div class="auto-item" style="height: 30px">10</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="height: 20px">3</div>
+      <div class="auto-item" style="height: 20px">7</div>
+      <div class="auto-item" style="height: 20px">11</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="height: 10px">4</div>
+      <div class="auto-item" style="height: 10px">8</div>
+      <div class="auto-item" style="height: 10px">12</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html
new file mode 100644
index 00000000000..6d31b153bed
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/column-item-tolerance-infinite.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Infinite value of item-tolerance</title>
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#item-slack">
+<link rel="match" href="column-item-tolerance-infinite-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: column;
+    background: gray;
+    grid-template-columns: repeat(4, 1fr);
+    item-tolerance: infinite;
+    gap: 20px;
+    padding: 20px;
+    width: 380px;
+    font: 15px/1 Ahem;
+}
+
+.auto-item {
+    padding: 10px;
+    width: 50px;
+    background: lightskyblue;
+}
+</style>
+<body>
+  <p>Test that the infinite tie threshold for masonry is correctly resolved.</p>
+  <div class="masonry">
+    <div class="auto-item" style="height: 40px">1</div>
+    <div class="auto-item" style="height: 30px">2</div>
+    <div class="auto-item" style="height: 20px">3</div>
+    <div class="auto-item" style="height: 10px">4</div>
+    <div class="auto-item" style="height: 40px">5</div>
+    <div class="auto-item" style="height: 30px">6</div>
+    <div class="auto-item" style="height: 20px">7</div>
+    <div class="auto-item" style="height: 10px">8</div>
+    <div class="auto-item" style="height: 40px">9</div>
+    <div class="auto-item" style="height: 30px">10</div>
+    <div class="auto-item" style="height: 20px">11</div>
+    <div class="auto-item" style="height: 10px">12</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance-ref.html
new file mode 100644
index 00000000000..d5db97a431b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance-ref.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    font: 50px/1 Ahem;
+    grid-template-rows: repeat(2, 1fr);
+    gap: 20px;
+    padding: 20px;
+    width: 170px;
+}
+
+.auto-item {
+    padding: 10px;
+    height: 100px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+    grid-column: 1;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+    grid-column: 1;
+}
+
+.auto-item:nth-of-type(3) {
+    background: palegoldenrod;
+    grid-column: 2;
+    transform: translateX(-50px);
+}
+
+.auto-item:nth-of-type(4) {
+    background: lightgreen;
+    grid-column: 2;
+    grid-row: 1;
+}
+</style>
+<body>
+  <p>Test that the initial tie threshold for masonry is correctly resolved.</p>
+  <div class="grid">
+    <div class="auto-item" style="width: 80px"></div>
+    <div class="auto-item" style="width: 30px"></div>
+    <div class="auto-item" style="width: 80px"></div>
+    <div class="auto-item" style="width: 30px"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html
new file mode 100644
index 00000000000..7cab2612182
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-initial-item-tolerance.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Initial value of item-tolerance</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#item-slack">
+<link rel="match" href="row-initial-item-tolerance-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    font: 50px/1 Ahem;
+    grid-template-rows: repeat(2, 1fr);
+    item-tolerance: initial;
+    gap: 20px;
+    padding: 20px;
+    width: 170px;
+}
+
+.auto-item {
+    padding: 10px;
+    height: 100px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.auto-item:nth-of-type(4) {
+    background: palegoldenrod;
+}
+</style>
+<body>
+  <p>Test that the initial tie threshold for masonry is correctly resolved.</p>
+  <div class="masonry">
+    <div class="auto-item" style="width: 80px"></div>
+    <div class="auto-item" style="width: 30px"></div>
+    <div class="auto-item" style="width: 30px"></div>
+    <div class="auto-item" style="width: 80px"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite-ref.html
new file mode 100644
index 00000000000..9ebcc82b9bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite-ref.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    font: 15px/1 Ahem;
+    grid-template-rows: repeat(4, 1fr);
+    gap: 20px;
+    padding: 20px;
+    width: 380px;
+}
+
+.auto-item {
+    padding: 10px;
+    height: 50px;
+    background: lightskyblue;
+}
+
+.flex {
+  gap: 20px;
+  display: flex;
+  flex-direction: row;
+}
+</style>
+<body>
+  <p>Test that the infinite tie threshold for masonry is correctly resolved.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="auto-item" style="width: 40px">1</div>
+      <div class="auto-item" style="width: 40px">5</div>
+      <div class="auto-item" style="width: 40px">9</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="width: 30px">2</div>
+      <div class="auto-item" style="width: 30px">6</div>
+      <div class="auto-item" style="width: 30px">10</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="width: 20px">3</div>
+      <div class="auto-item" style="width: 20px">7</div>
+      <div class="auto-item" style="width: 20px">11</div>
+    </div>
+    <div class="flex">
+      <div class="auto-item" style="width: 10px">4</div>
+      <div class="auto-item" style="width: 10px">8</div>
+      <div class="auto-item" style="width: 10px">12</div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html
new file mode 100644
index 00000000000..8757d247870
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/item-tolerance/row-item-tolerance-infinite.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Masonry Test: Infinite value of item-tolerance</title>
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3/#item-slack">
+<link rel="match" href="row-item-tolerance-infinite-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    grid-template-rows: repeat(4, 1fr);
+    item-tolerance: infinite;
+    gap: 20px;
+    padding: 20px;
+    width: 380px;
+    font: 15px/1 Ahem;
+}
+
+.auto-item {
+    padding: 10px;
+    height: 50px;
+    background: lightskyblue;
+}
+</style>
+<body>
+  <p>Test that the infinite tie threshold for masonry is correctly resolved.</p>
+  <div class="masonry">
+    <div class="auto-item" style="width: 40px">1</div>
+    <div class="auto-item" style="width: 30px">2</div>
+    <div class="auto-item" style="width: 20px">3</div>
+    <div class="auto-item" style="width: 10px">4</div>
+    <div class="auto-item" style="width: 40px">5</div>
+    <div class="auto-item" style="width: 30px">6</div>
+    <div class="auto-item" style="width: 20px">7</div>
+    <div class="auto-item" style="width: 10px">8</div>
+    <div class="auto-item" style="width: 40px">9</div>
+    <div class="auto-item" style="width: 30px">10</div>
+    <div class="auto-item" style="width: 20px">11</div>
+    <div class="auto-item" style="width: 10px">12</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-001.html
index 58d5eba7c0c..a7baa76c7dd 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-001.html
@@ -15,11 +15,9 @@
     }
 
     grid {
-      display: inline-grid;
       display: inline-masonry;
       gap: 10px 20px;
       grid-template-columns: repeat(4,80px);
-      grid-template-rows: masonry;
       color: #444;
       border: 1px solid;
       padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-002.html
index 422575be1d3..227ff8e413a 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-002.html
@@ -15,11 +15,9 @@
     }
 
     grid {
-      display: inline-grid;
       display: inline-masonry;
       gap: 10px 20px;
       grid-auto-columns: 80px;
-      grid-template-rows: masonry;
       color: #444;
       border: 1px solid;
       padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-003.html
index a5ba0c7331c..7cff6246457 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-003.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-003.html
@@ -15,12 +15,10 @@
     }
 
     grid {
-      display: inline-grid;
       display: inline-masonry;
       gap: 10px 20px;
       grid-auto-flow: dense;
       grid-auto-columns: 80px;
-      grid-template-rows: masonry;
       color: #444;
       border: 1px solid;
       padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-004.html
index 6f05dec9c6b..26eaed1bc3d 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-004.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-004.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-005.html
index 3e3a86ac4c0..3d34fdc1695 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-005.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-005.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-006.html
index ee8fbaf94e8..896c53dc2b3 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-006.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-006.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-007.html
index bd596ac8906..77c08cb384d 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-007.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-007.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 1px 2px;
   grid-template-columns: repeat(4,20px);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html
index 648563ef99c..b8f19512935 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-item-placement-008.html
@@ -10,9 +10,7 @@
 <body>
 <style>
 grid {
-  display: inline-grid;
   display: inline-masonry;
-  grid-template-rows: masonry;
   grid-template-columns: repeat( auto-fill, minmax(200px, 400px) );
   gap: 30px;
   max-width: 50vw;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html
index eccb312df88..8e1f554ed42 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/masonry-rows-with-grid-width-changed.html
@@ -9,9 +9,7 @@
 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
 <style>
   grid {
-    display: grid;
     display: masonry;
-    grid-template-rows: masonry;
     grid-template-columns: auto;
     grid-gap: 10px;
     font-family: Ahem;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001-ref.html
new file mode 100644
index 00000000000..fa340f453a2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001-ref.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px auto 100px;
+    align-items: start;
+    background: gray;
+    width: 300px;
+    padding: 10px;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+    overflow: visible;
+    flex-wrap: nowrap;
+    align-items: flex-start;
+}
+
+.square-100x100 {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned when the grid-axis is the block axis. Ensure that margin affects placement.</p>
+  <div class="grid">
+    <div class="flex">
+      <div class="square-100x100" style="background: lightskyblue; margin-right: 100px;">
+        Number 1
+    </div>
+    <div style="background: brown; width: 100px; height: 210px;">
+      Number 6
+    </div>
+    </div>
+    <div class="flex">
+      <div class="square-100x100" style="background: lightcoral; margin-bottom: 10px;">
+        Number 2
+    </div>
+    <div class="square-100x100" style="background: lightpink; margin-bottom: 10px;">
+      Number 4
+    </div>
+    </div>
+    <div class="flex">
+      <div class="square-100x100" style="background: lightgreen; margin-right: 40px;">
+        Number 3
+    </div>
+    <div class="square-100x100" style="background: lightpink; margin-left: -20px;">
+        Number 5
+    </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html
new file mode 100644
index 00000000000..267bb5628d0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-001.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-placement-001-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto;
+    width: 300px;
+    padding: 10px;
+}
+
+.first-track {
+    background: lightskyblue;
+    grid-row-start: 1;
+}
+
+.second-track {
+    background: lightcoral;
+    grid-row-start: 2;
+}
+
+.third-track {
+    background: lightgreen;
+    grid-row-start: 3;
+}
+
+.square-100x100 {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned when the grid-axis is the block axis. Ensure that margin affects placement.</p>
+  <div class="masonry">
+    <div class="first-track square-100x100" style="margin-right: 40px;">
+      Number 1
+    </div>
+    <div class="second-track square-100x100" style="margin-bottom: 10px;">
+      Number 2
+    </div>
+    <div class="third-track square-100x100" style="margin-right: 40px;">
+      Number 3
+    </div>
+    <div class="square-100x100" style="background-color: lightpink;">
+      Number 4
+    </div>
+    <div class="square-100x100" style="background-color: lightpink; margin-left: -20px;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; width: 100px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002-ref.html
new file mode 100644
index 00000000000..00b3b19836c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002-ref.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: auto auto auto;
+    grid-template-columns: auto auto auto;
+    width: 870px;
+    gap: 20px;
+    padding: 20px;
+    align-items: start;
+    font: 15px/1 "Ahem";
+}
+
+.grid > div {
+    width: max-content;
+}
+
+.grid-auto-item-1 {
+    background: lightskyblue;
+    padding: 10px;
+}
+
+.grid-auto-item-2 {
+    background: lightcoral;
+    padding: 10px;
+}
+
+.grid-auto-item-3 {
+    background: lightgreen;
+    padding: 10px;
+}
+
+.grid-auto-item-4 {
+    background: lightpink;
+    padding: 10px;
+    grid-row: 1 / 3;
+    align-self: stretch;
+    transform: translateX(-3em);
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned within the grid axis.</p>
+  <div class="grid">
+    <div class="grid-auto-item-1" style="grid-row: 1;">This is some text</div>
+    <div class="grid-auto-item-2" style="grid-row: 2;">Some larger words in this sentence</div>
+    <div class="grid-auto-item-3" style="grid-row: 3;">The cat cannot be separated from milk</div>
+    <div class="grid-auto-item-4">The cat still cannot be separated from milk</div>
+    <div class="grid-auto-item-4">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html
new file mode 100644
index 00000000000..e4d36a51985
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-002.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-auto-placement-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: auto auto auto;
+    masonry-direction: row;
+    width: 870px;
+    padding: 20px;
+    gap: 20px;
+    font: 15px/1 "Ahem";
+}
+
+.masonry > div {
+    width: max-content;
+}
+
+.auto-item {
+    padding: 10px;
+}
+
+.auto-item:nth-of-type(1) {
+    background: lightskyblue;
+}
+
+.auto-item:nth-of-type(2) {
+    background: lightcoral;
+}
+
+.auto-item:nth-of-type(3) {
+    background: lightgreen;
+}
+
+.two-track-spanner {
+    background: lightpink;
+    grid-row: span 2;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry items with auto placement are correctly positioned within the grid axis.</p>
+  <div class="masonry">
+    <div class="auto-item">This is some text</div>
+    <div class="auto-item">Some larger words in this sentence</div>
+    <div class="auto-item">The cat cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+    <div class="two-track-spanner">The cat still cannot be separated from milk</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content-ref.html
new file mode 100644
index 00000000000..1958f237a73
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content-ref.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.grid {
+    display: grid;
+    grid-template-rows: 15px auto auto;
+    align-items: start;
+    background: gray;
+    padding: 10px;
+    width: max-content;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+    overflow: visible;
+    flex-wrap: nowrap;
+    width: max-content;
+}
+</style>
+<body>
+  <p>Ensure that masonry containers are sized correctly under max-content constraints even if the items do not have the max-content style.</p>
+  <div class="grid">
+    <div class="flex">
+      <div style="background: lightskyblue;">
+        Number 1
+    </div>
+    <div style="background: brown; height: 30px;">
+      Number 4
+    </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightcoral;">
+        Number 2
+    </div>
+    </div>
+    <div class="flex">
+      <div style="background: lightgreen;">
+        Number 3
+    </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html
new file mode 100644
index 00000000000..1ad121de132
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-max-content.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-placement-max-content-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto;
+    width: max-content;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Ensure that masonry containers are sized correctly under max-content constraints even if the items do not have the max-content style.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div class="second-track" style="background: lightcoral;">
+      Number 2
+    </div>
+    <div class="third-track" style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content-ref.html
new file mode 100644
index 00000000000..ed0df33f62f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content-ref.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.grid {
+    display: grid;
+    grid-template-rows: 15px auto auto;
+    width: min-content;
+    align-items: start;
+    padding: 10px;
+}
+
+#gray-bg {
+    background: gray;
+    position: absolute;
+    z-index: -1;
+}
+</style>
+<body>
+  <p>Ensure that masonry containers are sized correctly under min-content constraints even if the items do not have the min-content style.</p>
+  <div id="gray-bg"></div>
+  <div id="shown-items" class="grid">
+    <div style="background: lightskyblue; width: max-content; grid-row: 1; grid-column: 1;">
+        Number 1
+    </div>
+    <div style="background: brown; height: 30px; width: max-content; grid-row: 1; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="grid-row: 2; grid-column: 1;">
+      <div style="background: lightcoral;">
+        Number 2
+    </div>
+    </div>
+    <div style="grid-row: 3; grid-column: 1;">
+      <div style="background: lightgreen;">
+        Number 3
+      </div>
+    </div>
+  </div>
+  <div id="grid-with-min-content" class="grid" style="visibility: hidden;">
+    <div id="number1" style="visibility: hidden; width: min-content; grid-row: 1; grid-column: 1;">
+      Number 1
+    </div>
+    <div id="number4" style="visibility: hidden; height: 30px; width: min-content; grid-row: 1; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="grid-row: 2; grid-column: 1; width: min-content;">
+      <div style="visibility: hidden;">
+        Number 2
+    </div>
+    </div>
+    <div style="grid-row: 3; grid-column: 1; width: min-content;">
+      <div style="visibility: hidden;">
+        Number 3
+      </div>
+    </div>
+  </div>
+</body>
+<script>
+window.addEventListener('DOMContentLoaded', function() {
+  const grid_with_min_content = document.getElementById('grid-with-min-content');
+  const shown_items = document.getElementById('shown-items');
+
+  let gray_bg = document.getElementById('gray-bg');
+
+  // Set grayBg size to match grid-with-min-content width and shown-items height
+  gray_bg.style.width = grid_with_min_content.offsetWidth + 'px';
+  gray_bg.style.height = shown_items.offsetHeight + 'px';
+});
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html
new file mode 100644
index 00000000000..2e7f58d79d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/item-placement/row-auto-placement-min-content.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-placement-min-content-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto;
+    width: min-content;
+    padding: 10px;
+}
+</style>
+<body>
+  <p>Ensure that masonry containers are sized correctly under min-content constraints even if the items do not have the min-content style.</p>
+  <div class="masonry">
+    <div style="background: lightskyblue;" >
+      Number 1
+    </div>
+    <div style="background: lightcoral;" >
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-columns-item-containing-block-is-grid-content-width.html b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-columns-item-containing-block-is-grid-content-width.html
index 1f474148fdb..2b1c53c97d8 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-columns-item-containing-block-is-grid-content-width.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-columns-item-containing-block-is-grid-content-width.html
@@ -7,9 +7,7 @@
 <meta name="assert" content="Test passes if SVG uses grid's content logical width for its containing block size and get sized to 100px x 100px">
 <style>
 grid {
-    display: grid;
     display: masonry;
-    grid-template-columns:masonry;
     grid-template-rows: auto;
     masonry-direction: row;
 }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html
index da13a8fd44e..eaafd5f7189 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-grid-template-columns-computed-withcontent.html
@@ -10,9 +10,7 @@
   <script src="/css/support/computed-testcommon.js"></script>
   <style>
     #target {
-      display: grid;
       display: masonry;
-      grid-template-rows: masonry;
       font-size: 40px;
       min-width: 200px;
       width: 300px;
@@ -38,7 +36,7 @@
   </div>
 </div>
 <script>
-  test_computed_value("grid-template-rows", 'masonry', 'masonry');
+  test_computed_value("grid-template-rows", 'none', 'none');
   test_computed_value("grid-template-columns", 'none', 'none'); // "none" without #child
 
   // track-size <fixed-breadth> = <length-percentage> | <flex> | min-content | max-content | auto
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-not-inhibited-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-not-inhibited-001.html
index 33b0c5027a1..308f1bebfa5 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-not-inhibited-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/masonry-not-inhibited-001.html
@@ -7,10 +7,8 @@
 <style>
 grid {
   vertical-align: top;
-  display: inline-grid;
   display: inline-masonry;
   grid-template-columns: 60px 60px;
-  grid-template-rows: masonry;
   border: 2px solid black;
 }
 .overflowSet {
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001-ref.html
new file mode 100644
index 00000000000..c21deea2d17
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta; order: 10;">M</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+  <div id="blue" style="color: blue;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html
new file mode 100644
index 00000000000..a57b68bd02b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-001.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="column-order-property-auto-placement-001-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta; order: 10;">M</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+  <div id="blue" style="color: blue;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002-ref.html
new file mode 100644
index 00000000000..788ad0edf2a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color:magenta;">M</div>
+  <div id="lime" style="color:lime;order:-1;">L</div>
+  <div id="yellow" style="color:yellow;order:-5;">Y</div>
+  <div id="blue" style="color:blue;order:-10;">B</div>
+</div>
+</style>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html
new file mode 100644
index 00000000000..ec452b48fda
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-002.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="column-order-property-auto-placement-002-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta;">M</div>
+  <div id="lime" style="color: lime; order: -1;">L</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+  <div id="blue" style="color: blue; order: -10;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003-ref.html
new file mode 100644
index 00000000000..77eb8c1a062
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="lime" style="color: lime;">L</div>
+  <div id="magenta" style="color: magenta; order: 1;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html
new file mode 100644
index 00000000000..0369610bb32
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-003.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="column-order-property-auto-placement-003-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="lime" style="color: lime;">L</div>
+  <div id="magenta" style="color: magenta; order: 1;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004-ref.html
new file mode 100644
index 00000000000..da9617ec89b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="blue" style="color: blue; order: 1;">B</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html
new file mode 100644
index 00000000000..f43a9ffa0fa
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-004.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="column-order-property-auto-placement-004-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="blue" style="color: blue; order: 1;">B</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005-ref.html
new file mode 100644
index 00000000000..ea2d97e4436
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="yellow" style="color: yellow; order: -1;">Y</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="lime" style="color: lime; order: 1;">L</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html
new file mode 100644
index 00000000000..b9ee0263a22
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/column-order-property-auto-placement-005.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="column-order-property-auto-placement-005-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="yellow" style="color: yellow; order: -1;">Y</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="lime" style="color: lime; order: 1;">L</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/masonry-order-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/masonry-order-001.html
index d62e94707cf..d628bcabdc7 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/order/masonry-order-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/masonry-order-001.html
@@ -16,11 +16,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   gap: 10px 20px;
   grid-template-columns:  repeat(4,auto);
-  grid-template-rows: masonry;
   color: #444;
   border: 1px solid;
   padding: 2px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001-ref.html
new file mode 100644
index 00000000000..426cc82486f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  grid-auto-flow: column;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta; order: 10;">M</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+  <div id="blue" style="color: blue;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html
new file mode 100644
index 00000000000..6affd4a088c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-001.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-order-property-auto-placement-001-ref.html">
+<style>
+#masonry {
+  display: masonry;
+  font: 50px/1 Ahem;
+  masonry-direction: row;
+  grid-template-rows: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="masonry">
+  <div id="magenta" style="color: magenta; order: 10;">M</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+  <div id="blue" style="color: blue;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002-ref.html
new file mode 100644
index 00000000000..150bc80085f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  grid-auto-flow: column;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta;">M</div>
+  <div id="lime" style="color: lime; order: -1;">L</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+  <div id="blue" style="color: blue; order: -10;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html
new file mode 100644
index 00000000000..18a9909940d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-002.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-order-property-auto-placement-002-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  masonry-direction: row;
+  grid-template-rows: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="magenta" style="color: magenta;">M</div>
+  <div id="lime" style="color: lime; order: -1;">L</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+  <div id="blue" style="color: blue; order: -10;">B</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003-ref.html
new file mode 100644
index 00000000000..822b694e8b2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  grid-auto-flow: column;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="lime" style="color: lime;">L</div>
+  <div id="magenta" style="color: magenta; order: 1;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html
new file mode 100644
index 00000000000..775cffe33e5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-003.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-order-property-auto-placement-003-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  masonry-direction: row;
+  grid-template-rows: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="lime" style="color: lime;">L</div>
+  <div id="magenta" style="color: magenta; order: 1;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="yellow" style="color: yellow; order: -5;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004-ref.html
new file mode 100644
index 00000000000..bc4d37209b2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  grid-auto-flow: column;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="blue" style="color: blue; order: 1;">B</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html
new file mode 100644
index 00000000000..bd7c1be6a7f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-004.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-order-property-auto-placement-004-ref.html">
+<style>
+#grid {
+  display: masonry;
+  masonry-direction: row;
+  font: 50px/1 Ahem;
+  grid-template-rows: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="blue" style="color: blue; order: 1;">B</div>
+  <div id="lime" style="color: lime; order: 5;">L</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="yellow" style="color: yellow; order: 1;">Y</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005-ref.html
new file mode 100644
index 00000000000..608740cc309
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  font: 50px/1 Ahem;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  grid-auto-flow: column;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="yellow" style="color: yellow; order: -1;">Y</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="lime" style="color: lime; order: 1;">L</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html
new file mode 100644
index 00000000000..7d02417aadd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/order/row-order-property-auto-placement-005.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="row-order-property-auto-placement-005-ref.html">
+<style>
+#grid {
+  display: masonry;
+  font: 50px/1 Ahem;
+  masonry-direction: row;
+  grid-template-rows: auto auto;
+  justify-content: start;
+  align-content: start;
+}
+</style>
+<p>Ensure `order` property affects masonry layout correctly</p>
+<div id="grid">
+  <div id="yellow" style="color: yellow; order: -1;">Y</div>
+  <div id="magenta" style="color: magenta; order: 5;">M</div>
+  <div id="blue" style="color: blue; order: -5;">B</div>
+  <div id="lime" style="color: lime; order: 1;">L</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/parsing/masonry-parsing.html b/tests/wpt/tests/css/css-grid/masonry/tentative/parsing/masonry-parsing.html
deleted file mode 100644
index 64af83b316c..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/parsing/masonry-parsing.html
+++ /dev/null
@@ -1,78 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>CSS Masonry Test: parsing properties and shortands</title>
-<link rel="help" href="https://drafts.csswg.org/css-grid-3/#grid-template-masonry">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-<script src="/css/support/shorthand-testcommon.js"></script>
-</head>
-<body>
-<script>
-function masonry_test_template_prop(name) {
-  test_valid_value(name, 'masonry');
-  test_invalid_value(name, 'masonry []');
-  test_invalid_value(name, 'masonry [foo] 40px');
-  test_invalid_value(name, 'masonry 40px');
-  test_invalid_value(name, '[foo] masonry');
-  test_invalid_value(name, '0px masonry');
-  test_invalid_value(name, 'masonry masonry');
-  test_invalid_value(name, 'subgrid masonry');
-  test_invalid_value(name, 'masonry subgrid');
-  test_invalid_value(name, 'masonry repeat(1, [])');
-  test_invalid_value(name, 'masonry repeat(auto-fill, [])');
-  test_invalid_value(name, 'masonry / none');
-}
-masonry_test_template_prop("grid-template-columns");
-masonry_test_template_prop("grid-template-rows");
-
-test_shorthand_value("grid-template", 'masonry / masonry', {
-  'grid-template-rows': 'masonry',
-  'grid-template-columns': 'masonry',
-  'grid-template-areas': 'none'
-});
-
-test_shorthand_value("grid-template", 'masonry / subgrid [foo]', {
-  'grid-template-rows': 'masonry',
-  'grid-template-columns': 'subgrid [foo]',
-  'grid-template-areas': 'none'
-});
-
-test_shorthand_value("grid-template", '10px / masonry', {
-  'grid-template-rows': '10px',
-  'grid-template-columns': 'masonry',
-  'grid-template-areas': 'none'
-});
-
-test_shorthand_value("grid", 'masonry / masonry', {
-  'grid-template-rows': 'masonry',
-  'grid-template-columns': 'masonry',
-  'grid-template-areas': 'none',
-  'grid-auto-rows': 'auto',
-  'grid-auto-columns': 'auto',
-  'grid-auto-flow': 'row'
-});
-
-test_shorthand_value("grid", 'masonry / subgrid [foo]', {
-  'grid-template-rows': 'masonry',
-  'grid-template-columns': 'subgrid [foo]',
-  'grid-template-areas': 'none',
-  'grid-auto-rows': 'auto',
-  'grid-auto-columns': 'auto',
-  'grid-auto-flow': 'row'
-});
-
-test_shorthand_value("grid", '10px / masonry', {
-  'grid-template-rows': '10px',
-  'grid-template-columns': 'masonry',
-  'grid-template-areas': 'none',
-  'grid-auto-rows': 'auto',
-  'grid-auto-columns': 'auto',
-  'grid-auto-flow': 'row'
-});
-
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/resources/pink-image.png b/tests/wpt/tests/css/css-grid/masonry/tentative/resources/pink-image.png
new file mode 100644
index 0000000000000000000000000000000000000000..defcd193c3d696f85d8d32fd1acb8804ea37a351
GIT binary patch
literal 410
zcmeAS@N?(olHy`uVBq!ia0vp^g+N@v!3HFc7RpKhDaPU;cPEB*=VV?2IV|apzK#qG
z8~eHcB(eheoCO|{#S9FR*Fcz2;^L{dKn?nyE{-7;ac?gg3La2kIN;D#ANZzYku~3m
zzx|P)=Wad!AoDZdp5sRtgqeMK3=9v9bVi-wMwZIXc2gc;crtjp`njxgN@xNA66A2R

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-001.html
new file mode 100644
index 00000000000..e8e1ebe7fe8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-001.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-empty-masonry-container-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.empty-container {
+  display: masonry;
+  masonry-direction: row;
+};
+</style>
+<body>
+  <p>Test that an empty masonry container renders nothing.</p>
+  <div class="empty-container"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-002.html
new file mode 100644
index 00000000000..860cc3f590a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/row-empty-masonry-container-002.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-empty-masonry-container-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    padding: 20px;
+}
+</style>
+<body>
+  <p>Test that an empty masonry container still renders padding.</p>
+  <div class="masonry"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container-ref.html
new file mode 100644
index 00000000000..9b18f6cfc3d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container-ref.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.grid {
+    display: grid;
+    grid-template-rows: auto auto auto;
+    align-items: start;
+    background: gray;
+    padding: 10px;
+}
+
+.flex {
+    display: flex;
+    flex-direction: row;
+    overflow: visible;
+    flex-wrap: nowrap;
+}
+
+.invisible {
+  visibility: hidden;
+}
+</style>
+<body>
+  <p>Ensure that containers with min and max-content constraints are sized correctly when all items inside are sized as min/max-content.</p>
+  <div class="grid" style="margin-bottom: 10px; width: min-content;">
+    <div class="flex" style="width: min-content;">
+      <div class="invisible" style="width: min-content;">
+        Number 1
+      </div>
+      <div class="invisible" style="width: min-content;">
+        Number 4
+      </div>
+    </div>
+    <div class="flex" style="width: min-content;">
+      <div class="invisible" style="width: min-content;">
+        Number 2
+    </div>
+    </div>
+    <div class="flex" style="width: min-content;">
+      <div class="invisible" style="width: min-content;">
+        Number 3
+      </div>
+    </div>
+  </div>
+
+  <div class="grid" style="width: max-content;">
+    <div class="flex" style="width: max-content;">
+      <div class="invisible" style="width: max-content;">
+        Number 1
+      </div>
+      <div class="invisible" style="width: max-content;">
+        Number 4
+      </div>
+    </div>
+    <div class="flex" style="width: max-content;">
+      <div class="invisible" style="width: max-content;">
+        Number 2
+      </div>
+    </div>
+    <div class="flex" style="width: max-content;">
+      <div class="invisible" style="width: max-content;">
+        Number 3
+      </div>
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container.html b/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container.html
new file mode 100644
index 00000000000..4849c48a694
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/row-min-max-content-container.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-min-max-content-container-ref.html">
+<link rel="author" title="Celeste Pan" href="mailto:celestepan@microsoft.com">
+<style>
+html,body {
+  color:black; background-color:white; font:15px/1 monospace; padding:0; margin:0;
+}
+
+.masonry {
+    display: masonry;
+    background: gray;
+    position: relative;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto;
+    padding: 10px;
+}
+
+.fourth-item {
+  grid-row: span 2;
+}
+
+.invisible {
+  visibility: hidden;
+}
+</style>
+<body>
+  <p>Ensure that containers with min and max-content constraints are sized correctly when all items inside are sized as min/max-content.</p>
+  <div class="masonry" style="margin-bottom: 10px; width: min-content;">
+    <div class="first-item invisible" style="width: min-content;">
+      Number 1
+    </div>
+    <div class="second-item invisible" style="width: min-content;">
+      Number 2
+    </div>
+    <div class="third-item invisible" style="width: min-content;">
+      Number 3
+    </div>
+    <div class="fourth-item invisible" style="width: min-content;">
+      Number 4
+    </div>
+  </div>
+  <div class="masonry" style="width: max-content;">
+    <div class="first-item invisible" style="width: max-content;">
+      Number 1
+    </div>
+    <div class="second-item invisible" style="width: max-content;">
+      Number 2
+    </div>
+    <div class="third-item invisible" style="width: max-content;">
+      Number 3
+    </div>
+    <div class="fourth-item invisible" style="width: max-content;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html
index 572d433ced9..d49d1c08a16 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   grid-template-rows: 50px 80px 40px;
-  grid-template-columns: masonry;
   gap: 4px 2px;
   padding: 1px 3px 5px 7px;
   border: solid;
@@ -28,7 +26,6 @@ grid {
 }
 .rows {
   grid-template-columns: 50px 80px 40px;
-  grid-template-rows: masonry;
 }
 item {
   background: grey;
@@ -56,8 +53,7 @@ subgrid {
 </head>
 <body>
 
-<!-- just to sanity check that `masonry` behaves as `none` in the column axis in this case: -->
-<grid style="grid:masonry/masonry">
+<grid>
   <item>1</item>
   <item>2</item>
   <item>3</item>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-002.html
index c41b8251aaf..1fa4c8694be 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-002.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-002.html
@@ -15,11 +15,9 @@ html,body {
 }
 
 grid {
-  display: inline-grid;
   display: inline-masonry;
   masonry-direction: row;
   grid-template-rows: 40px 30px 20px;
-  grid-template-columns: masonry;
   gap: 4px 2px;
   padding: 1px 3px 5px 7px;
   border: solid;
@@ -29,7 +27,6 @@ grid {
 .rows {
   masonry-direction: column;
   grid-template-columns: 40px 30px 20px;
-  grid-template-rows: masonry;
 }
 item {
   background: grey;
@@ -124,7 +121,7 @@ subgrid.extent {
   <item>1</item>
   <item>2</item>
   <item>3</item>
-  <subgrid style="grid: subgrid / masonry">
+  <subgrid style="grid: subgrid / none">
     <item>4a</item>
     <item>4b</item>
     <item>4c</item>
@@ -135,7 +132,7 @@ subgrid.extent {
 <!-- ... unless it's auto-placed in the first track ... -->
 <grid>
   <item>1</item>
-  <subgrid style="grid: subgrid / masonry">
+  <subgrid style="grid: subgrid / none">
     <item>4a</item>
     <item>4b</item>
     <item>4c</item>
@@ -241,7 +238,7 @@ subgrid.extent {
   <item>1</item>
   <item>2</item>
   <item>3</item>
-  <subgrid style="grid: masonry / subgrid">
+  <subgrid style="grid: none / subgrid">
     <item>4a</item>
     <item>4b</item>
     <item>4c</item>
@@ -252,7 +249,7 @@ subgrid.extent {
 <!-- ... unless it's auto-placed in the first track ... -->
 <grid class="rows">
   <item>1</item>
-  <subgrid style="grid: masonry / subgrid">
+  <subgrid style="grid: none / subgrid">
     <item>4a</item>
     <item>4b</item>
     <item>4c</item>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-flex.html b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-flex.html
index 85e179c1222..bcfaee7885c 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-flex.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-flex.html
@@ -12,10 +12,8 @@
   <link rel="match" href="masonry-subgrid-flex-ref.html">
   <style>
     grid {
-      display: inline-grid;
       display: inline-masonry;
       grid-template-columns: 1fr 2fr 3fr;
-      grid-template-rows: masonry;
       border: 1px solid;
       background: lightgrey;
     }
@@ -77,7 +75,7 @@
 <!-- Verify behavior when subgrid is set to masonry too -->
 <grid>
   <item>1</item>
-  <subgrid style="grid-template-rows: masonry; display: masonry;">
+  <subgrid style="display: masonry;">
     <item>2</item>
     <item style="width: 3ch">3</item>
     <item>4</item>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-intrinsic-sizing.html b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-intrinsic-sizing.html
index 53d6cdb9b28..f882723f61a 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-intrinsic-sizing.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid-intrinsic-sizing.html
@@ -12,10 +12,8 @@
   <link rel="match" href="masonry-subgrid-intrinsic-sizing-ref.html">
   <style>
     grid {
-      display: inline-grid;
       display: inline-masonry;
       grid-template-columns: auto min-content max-content;
-      grid-template-rows: masonry;
       border: 1px solid;
       background: lightgrey;
     }
@@ -77,7 +75,7 @@
 <!-- Verify behavior when subgrid is set to masonry too -->
 <grid>
   <item>1</item>
-  <subgrid style="grid-template-rows: masonry; display: masonry;">
+  <subgrid style="display: masonry;">
     <item>2</item>
     <item style="width: 3ch">3</item>
     <item>4</item>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid.html b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid.html
index 1d2eb07d1d2..8a64177d161 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/subgrid/track-sizing/masonry-subgrid.html
@@ -12,10 +12,8 @@
   <link rel="match" href="masonry-subgrid-ref.html">
   <style>
     grid {
-      display: inline-grid;
       display: inline-masonry;
       grid-template-columns: 50px 100px 200px;
-      grid-template-rows: masonry;
       border: 1px solid;
       background: lightgrey;
     }
@@ -77,7 +75,7 @@
 <!-- Verify behavior when subgrid is set to masonry too -->
 <grid>
   <item>1</item>
-  <subgrid style="grid-template-rows: masonry; display: masonry;">
+  <subgrid style="display: masonry;">
     <item>2</item>
     <item style="width: 3ch">3</item>
     <item>4</item>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/auto-repeat-no-children-crash.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/auto-repeat-no-children-crash.html
new file mode 100644
index 00000000000..2ca64b0db4c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/auto-repeat-no-children-crash.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>If an intrinsic auto repeat is used, we should not crash when there are no children</title>
+    <link rel="help" href="https://drafts.csswg.org/css-grid-3">
+    <link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+</head>
+<div style="display:masonry; grid-template-columns:repeat(2, 50px) repeat(auto-fill, auto);"></div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001-ref.html
new file mode 100644
index 00000000000..3bf88cce8ac
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, 100px);
+    grid-template-rows: 100px 100px 100px;
+    background: gray;
+    width: 300px;
+    height: 300px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html
new file mode 100644
index 00000000000..5489c659ea0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-001.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, 100px);
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002-ref.html
new file mode 100644
index 00000000000..0ae80efb32f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, 25%);
+    grid-template-rows: 100px 100px;
+    background: gray;
+    width: 300px;
+    height: 200px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html
new file mode 100644
index 00000000000..76cfd21076c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-002.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with percentage track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, 25%);
+    width: 300px;
+    height: 200px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html
new file mode 100644
index 00000000000..22118b815a7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-003.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    grid-template-columns: repeat(auto-fill, 50px);
+    min-height: 60px;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry"></div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html
new file mode 100644
index 00000000000..791842000bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-004.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    grid-template-columns: repeat(auto-fill, 50px);
+    min-height: 60%;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div style="width: min-content; height: 100px; background: green;">
+  <div style="height: 100%;">
+    <div class="masonry"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html
new file mode 100644
index 00000000000..da55d230f6b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-005.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>Auto repeater with minmax size.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    width: 100px;
+    grid-template-columns: repeat(auto-fill, minmax(50px, 25px));
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry">
+  <div style="background: green; height: 50px; width: 100%;"></div>
+  <div style="background: green; height: 50px; width: 100%;"></div>
+  <div style="background: green; height: 50px; width: 100%;"></div>
+  <div style="background: green; height: 50px; width: 100%;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-006.html
new file mode 100644
index 00000000000..8eb5767a99e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-006.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Checks that a dynamic change in containing block width changes the number of auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    height: 100px;
+    min-width: 60%;
+    grid-template-columns: repeat(auto-fill, 50px);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="width: 0px; height: 100px;">
+  <div class="masonry"></div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.width = '100px';
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html
new file mode 100644
index 00000000000..97367691505
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-007.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>Checks that a dynamic change in containing block height changes the number of auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    width: 100px;
+    min-height: 60%;
+    grid-template-columns: repeat(auto-fill, 50px);
+    aspect-ratio: 1/1;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="width: 0px; height: 100px;">
+  <div class="masonry"></div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html
new file mode 100644
index 00000000000..fb45f74d0a9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-008.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, 100px);
+    min-width: 300px;
+    min-height: 200px;
+    float: left;
+    background: pink;
+}
+.border {
+  border: 10px solid;
+}
+.border-box {
+  box-sizing: border-box;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 100%;
+  height: 200px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: 200px; height: 100px;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border border-box" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border border-box" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border border-box" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border border-box" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html
new file mode 100644
index 00000000000..8cfcfaf6c9b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-009.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use percentage min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, 100px);
+    min-width: 50%;
+    min-height: 80%;
+    float: left;
+    background: pink;
+}
+.wrapper {
+  width: 600px;
+  height: 250px;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 100%;
+  height: 200px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html
new file mode 100644
index 00000000000..4a531f7691a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-010.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage min sizes with percentage track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert"
+  content="This test checks that auto repeat tracks can use percentage track
+  size when only a min size is available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: inline-masonry;
+    grid-template-columns: repeat(auto-fill, 25%);
+    min-width: 50%;
+    height: 200px;
+    float: left;
+    background: pink;
+}
+.wrapper {
+  width: 600px;
+}
+.item {
+  background: lime;
+  width: 100%;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+  <div id="log"></div>
+
+  <div class="wrapper">
+    <div class="masonry" data-expected-width="300" data-expected-height="200">
+      <div class="item" data-expected-width="75">Cell 1</div>
+      <div class="item" data-expected-width="75">Cell 2</div>
+      <div class="item" data-expected-width="75">Cell 3</div>
+      <div class="item" data-expected-width="75">Cell 4</div>
+      <div class="item" data-expected-width="75">Cell 5</div>
+    </div>
+  </div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html
new file mode 100644
index 00000000000..993a8439556
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-011.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use percentage max size when size is indefinite to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, 100px);
+    max-width: 50%;
+    max-height: 80%;
+    background: pink;
+}
+.wrapper {
+  width: 600px;
+  height: 250px;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 100%;
+  height: 200px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="wrapper">
+  <div class="masonry" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: 200px; height: 100px;" data-expected-width="200" data-expected-height="100">
+    <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+  </div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html
new file mode 100644
index 00000000000..eb6745ab38f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-012.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with min and max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks don't overflow the masonry container size when max size is definite, even if min size is bigger than that.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, 100px);
+    max-width: 100px;
+    min-width: 250px;
+    max-height: 50px;
+    min-height: 125px;
+    float: left;
+    background: pink;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 100%;
+  height: 125px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013-ref.html
new file mode 100644
index 00000000000..ef7089974d9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  margin: 10px;
+  grid-template-columns: repeat(auto-fill, 50px 50px);
+  grid-column-gap: 100px;
+  width: 300px;
+  background: pink;
+}
+.grid > div {
+  background: lime;
+  width: 100%;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="grid">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html
new file mode 100644
index 00000000000..947779af4b7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-013.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and gutters.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-013-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  margin: 10px;
+  grid-template-columns: repeat(auto-fill, 50px 50px);
+  grid-column-gap: 100px;
+  width: 300px;
+  background: pink;
+}
+.masonry > div {
+  background: lime;
+  width: 100%;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014-ref.html
new file mode 100644
index 00000000000..10415ebc7cf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  grid-template-columns: 10px 20px repeat(auto-fill, 30px 40px) 50px 60px;
+  width: 300px;
+  background: pink;
+}
+.grid > :nth-child(2n) {
+  background: sienna;
+}
+.grid > :nth-child(2n+1) {
+  background: orange;
+}
+.grid > div {
+  width: 100%;
+  height: 25px;
+}
+.holder {
+  height: 30px;
+  width: 300px;
+  border-bottom: 2px solid #cfbfcf;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="holder">
+  <div class="grid">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div style="grid-column: 7;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid">
+    <div style="grid-column: 2;"></div>
+    <div></div>
+    <div style="grid-column: 5;"></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html
new file mode 100644
index 00000000000..015db4d3ad9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-014.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-014-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  grid-template-columns: 10px 20px repeat(auto-fill, 30px 40px) 50px 60px;
+  width: 300px;
+  background: pink;
+}
+.masonry > :nth-child(2n) {
+  background: sienna;
+}
+.masonry > :nth-child(2n+1) {
+  background: orange;
+}
+.masonry > div {
+  width: 100%;
+  height: 25px;
+}
+.holder {
+  height: 30px;
+  width: 300px;
+  border-bottom: 2px solid #cfbfcf;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="holder">
+  <div class="masonry">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="masonry">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div style="grid-column: 7;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="masonry">
+    <div style="grid-column: 2;"></div>
+    <div></div>
+    <div style="grid-column: 5;"></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015-ref.html
new file mode 100644
index 00000000000..d1ee1975e02
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015-ref.html
@@ -0,0 +1,161 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: inline-grid;
+  border: 1px solid black;
+  grid-template-columns: [u] repeat(auto-fill, [v] 10px [w] 10px [x] 10px [y]) [z];
+  grid-column-gap: 3px;
+  /* Does not fit a whole-number of repetitions */
+  width: 94px;
+  background: pink;
+}
+div > div {
+  background: blue;
+  width: 100%;
+  height: 25px;
+}
+</style>
+<body>
+    <!-- u -->
+    <div class="grid">
+        <div style="grid-column-start: u"></div>
+    </div>
+    <!-- non-existent line name -->
+    <div class="grid">
+        <div style="grid-column-start: nonesuch"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one u -->
+    <div class="grid">
+        <div style="grid-column-start: u 4"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u 9"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u -2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u -6"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: u -7"></div>
+    </div>
+    <!-- v -->
+    <div class="grid">
+        <div style="grid-column-start: v"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: v 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: v 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: v -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: v -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two v's -->
+    <div class="grid">
+        <div style="grid-column-start: v 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: v -3"></div>
+    </div>
+    <!-- w -->
+    <div class="grid">
+        <div style="grid-column-start: w"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: w 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: w 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: w -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: w -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two w's -->
+    <div class="grid">
+        <div style="grid-column-start: w 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: w -3"></div>
+    </div>
+    <!-- x -->
+    <div class="grid">
+        <div style="grid-column-start: x"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: x 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: x 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: x -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: x -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two x's -->
+    <div class="grid">
+        <div style="grid-column-start: x 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: x -3"></div>
+    </div>
+    <!-- y -->
+    <div class="grid">
+        <div style="grid-column-start: y"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: y 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: y 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: y -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: y -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two y's -->
+    <div class="grid">
+        <div style="grid-column-start: y -3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: y 3"></div>
+    </div>
+    <!-- z -->
+    <div class="grid">
+        <div style="grid-column-start: z"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: z 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: z -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one z -->
+    <div class="grid">
+        <div style="grid-column-start: z 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-column-start: z -2"></div>
+    </div>
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html
new file mode 100644
index 00000000000..7754e41e1b1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-015.html
@@ -0,0 +1,165 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and line names.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-015-ref.html">
+<style>
+.masonry {
+  display: inline-masonry;
+  border: 1px solid black;
+  grid-template-columns: [u] repeat(auto-fill, [v] 10px [w] 10px [x] 10px [y]) [z];
+  grid-column-gap: 3px;
+  /* Does not fit a whole-number of repetitions */
+  width: 94px;
+  background: pink;
+}
+div > div {
+  background: blue;
+  width: 100%;
+  height: 25px;
+}
+</style>
+<body>
+    <!-- u -->
+    <div class="masonry">
+        <div style="grid-column-start: u"></div>
+    </div>
+    <!-- non-existent line name -->
+    <div class="masonry">
+        <div style="grid-column-start: nonesuch"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one u -->
+    <div class="masonry">
+        <div style="grid-column-start: u 4"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u 9"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u -2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u -6"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: u -7"></div>
+    </div>
+    <!-- v -->
+    <div class="masonry">
+        <div style="grid-column-start: v"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: v 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: v 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: v -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: v -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two v's -->
+    <div class="masonry">
+        <div style="grid-column-start: v 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: v -3"></div>
+    </div>
+    <!-- w -->
+    <div class="masonry">
+        <div style="grid-column-start: w"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: w 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: w 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: w -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: w -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two w's -->
+    <div class="masonry">
+        <div style="grid-column-start: w 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: w -3"></div>
+    </div>
+    <!-- x -->
+    <div class="masonry">
+        <div style="grid-column-start: x"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: x 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: x 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: x -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: x -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two x's -->
+    <div class="masonry">
+        <div style="grid-column-start: x 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: x -3"></div>
+    </div>
+    <!-- y -->
+    <div class="masonry">
+        <div style="grid-column-start: y"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: y 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: y 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: y -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: y -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two y's -->
+    <div class="masonry">
+        <div style="grid-column-start: y -3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: y 3"></div>
+    </div>
+    <!-- z -->
+    <div class="masonry">
+        <div style="grid-column-start: z"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: z 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: z -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one z -->
+    <div class="masonry">
+        <div style="grid-column-start: z 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-column-start: z -2"></div>
+    </div>
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016-ref.html
new file mode 100644
index 00000000000..828f8a7b09b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, 100px);
+    grid-template-rows: 100px 100px 100px;
+    background: gray;
+    height: 300px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="grid-column: span 3; background: blue;">
+      Number 7
+    </div>
+    <div style="grid-column: span 3; background: yellow;">
+      Number 8
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html
new file mode 100644
index 00000000000..56efc15818a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-016.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-016-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px);
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="grid-column: span 3; background: blue;">
+      Number 7
+    </div>
+    <div style="grid-column: span 3; background: yellow;">
+      Number 8
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017-ref.html
new file mode 100644
index 00000000000..d691a26bd67
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 100px 100px;
+    grid-template-rows: 100px 100px 100px;
+    background: gray;
+    height: 300px;
+    width: 300px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html
new file mode 100644
index 00000000000..07fb075a2ca
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-017.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-017-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px);
+    height: 300px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018-ref.html
new file mode 100644
index 00000000000..c2a974b8d8b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 100px 100px 100px;
+    grid-template-rows: 100px 100px;
+    background: gray;
+    height: 200px;
+    width: 500px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html
new file mode 100644
index 00000000000..14c62eb80a1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-018.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-018-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px);
+    height: 200px;
+    width: 500px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 5;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 1;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html
new file mode 100644
index 00000000000..1766a4bd811
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-019.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: 1;"></div>
+  <div style="grid-column: 3;"></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 0px 0px 0px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html
new file mode 100644
index 00000000000..ed496edd8da
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-020.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div style="grid-column: 4"></div>
+  <div style="grid-column: 6"></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 100px 0px 100px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021-ref.html
new file mode 100644
index 00000000000..df8e67b2725
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    width: 100%;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-column: span 4;">1</div>
+  <div style="grid-column: 4 / span 2;">2</div>
+  <div style="grid-column: 9 / span 2; grid-row: 1;">3</div>
+  <div style="grid-column: 7; grid-row: 1;">4</div>
+  <div style="grid-column: 9 / span 2;">5</div>
+  <div style="grid-column: 6; grid-row: 1;">6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html
new file mode 100644
index 00000000000..24bb78eefa5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-021.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-021-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 4;">1</div>
+  <div style="grid-column: 4 / span 2;">2</div>
+  <div style="grid-column: 9 / span 2;">3</div>
+  <div style="grid-column: 7;">4</div>
+  <div style="grid-column: span 2;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html
new file mode 100644
index 00000000000..081f1a62717
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-022.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-021-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: 50px repeat(5, 50px) repeat(auto-fit, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 4;">1</div>
+  <div style="grid-column: 4 / span 2;">2</div>
+  <div style="grid-column: 9 / span 2;">3</div>
+  <div style="grid-column: 7;">4</div>
+  <div style="grid-column: span 2;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023-ref.html
new file mode 100644
index 00000000000..04d8e262810
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 100px 100px;
+    grid-template-rows: 100px 100px 100px;
+    background: gray;
+    height: 500px;
+    width: 300px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 2;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 2;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html
new file mode 100644
index 00000000000..979fc21f73a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-023.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-023-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: 100px repeat(auto-fit, 100px);
+    height: 500px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- Only column 2 should get collapsed -->
+    <div style="background: lightskyblue; grid-column: 3;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html
new file mode 100644
index 00000000000..4d9496aa547
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-024.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(5, 100px) repeat(auto-fit, 100px);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 100px 100px 100px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html
new file mode 100644
index 00000000000..76fc6a9df19
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-025.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, 100px) repeat(5, 100px);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 100px 100px 100px 100px 100px 100px 100px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026-ref.html
new file mode 100644
index 00000000000..d491afcc35d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(8, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    width: 100%;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-column: span 3;"></div>
+  <div style="grid-column: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html
new file mode 100644
index 00000000000..a8bb0f5578a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-026.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-026-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px) repeat(auto-fit, 50px) repeat(4, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 3;"></div>
+  <div style="grid-column: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027-ref.html
new file mode 100644
index 00000000000..8209c1510d1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, 100px);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027.html
new file mode 100644
index 00000000000..3a3675afc98
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/column-auto-repeat-027.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-027-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, 100px);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html
new file mode 100644
index 00000000000..aa1d7ce29e5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-001.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../column-auto-repeat-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002-ref.html
new file mode 100644
index 00000000000..240fe8be329
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002-ref.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto auto;
+    grid-template-rows: 100px 100px;
+    background: gray;
+    width: 400px;
+    height: 200px;
+}
+
+.grid > div {
+    width: 25%;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html
new file mode 100644
index 00000000000..e97c7dac9df
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-002.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and percentage sized children</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    height: 200px;
+}
+
+.masonry > div {
+    width: 25%;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003-ref.html
new file mode 100644
index 00000000000..3d10f21cd30
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 100px 100px 100px 100px;
+    grid-template-rows: 50px 50px 50px 50px;
+    background: gray;
+    width: 400px;
+    height: 200px;
+}
+
+.grid > div {
+    width: 75%;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: span 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: span 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: span 4;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: span 2;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html
new file mode 100644
index 00000000000..3aaa382e1af
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-003.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and percentage sized spanning children</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    height: 200px;
+}
+
+.masonry > div {
+    width: 75%;
+    height: 50px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: span 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: span 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: span 4;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: span 2;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004-ref.html
new file mode 100644
index 00000000000..7736e8267d0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto auto;
+    grid-template-rows: 50px 50px 50px 50px;
+    grid-gap: 20px;
+    background: gray;
+    width: 400px;
+    height: 260px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: span 2; width: 200px">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: span 3; width: 300px;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: span 4; width: 400px;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: span 2; width: 200px;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html
new file mode 100644
index 00000000000..e8595dd433d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-004.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and spanning children with gap</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    grid-gap: 20px;
+    width: 400px;
+    height: 260px;
+}
+
+.masonry > div {
+    height: 50px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: span 2; width: 200px">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: span 3; width: 300px;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: span 4; width: 400px;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: span 2; width: 200px;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005-ref.html
new file mode 100644
index 00000000000..afbbcb7048e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    width: 300px;
+    height: 300px;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html
new file mode 100644
index 00000000000..dc06daf9f5d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-005.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-columns: auto repeat(auto-fill, auto) auto;
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html
new file mode 100644
index 00000000000..a82b63819c6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-006.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks with auto size.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    grid-template-columns: repeat(auto-fill, auto);
+    min-height: 60px;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry">
+    <div style="height: 1px; width: 50px; visibility: hidden;">x</div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html
new file mode 100644
index 00000000000..a6ab990907f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-007.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    grid-template-columns: repeat(auto-fill, auto);
+    min-height: 60%;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div style="width: min-content; height: 100px; background: green;">
+  <div style="height: 100%;">
+    <div class="masonry">
+      <div style="height: 1px; width: 50px; visibility: hidden;">x</div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-008.html
new file mode 100644
index 00000000000..35a0d9ca1a2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-008.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>Checks that a dynamic change in containing block width changes the number of auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    height: 100px;
+    min-width: 60%;
+    grid-template-columns: repeat(auto-fill, auto);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="width: 0px; height: 100px;">
+  <div class="masonry">
+    <div style="height: 1px; width: 50px;visibility: hidden;">x</div>
+  </div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.width = '100px';
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html
new file mode 100644
index 00000000000..a0e72368b49
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-009.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, auto);
+    min-width: 300px;
+    min-height: 200px;
+    float: left;
+    background: pink;
+}
+.border {
+  border: 10px solid;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 150px;
+  height: 200px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: 200px; height: 100px;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+<div class="masonry border" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="150" data-expected-height="200"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html
new file mode 100644
index 00000000000..4f5b5925283
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-010.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with min and max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks don't overflow the masonry container size when max size is definite, even if min size is bigger than that.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-columns: repeat(auto-fill, auto);
+    max-width: 100px;
+    min-width: 250px;
+    max-height: 50px;
+    min-height: 125px;
+    float: left;
+    background: pink;
+}
+.item {
+  background: lime;
+  /* Place item on the last column. */
+  grid-column: -2;
+  width: 100px;
+  height: 125px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="75" data-offset-y="0" data-expected-width="100" data-expected-height="125"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011-ref.html
new file mode 100644
index 00000000000..0c115d604cd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  margin: 10px;
+  grid-template-columns: repeat(auto-fill, 100px 100px);
+  grid-column-gap: 100px;
+  width: 300px;
+  background: pink;
+}
+.grid > div {
+  background: lime;
+  width: 50px;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="grid">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html
new file mode 100644
index 00000000000..dadbe59ba10
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-011.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and gutters.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-011-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  margin: 10px;
+  grid-template-columns: repeat(auto-fill, auto auto);
+  grid-column-gap: 100px;
+  width: 300px;
+  background: pink;
+}
+.masonry > div {
+  background: lime;
+  width: 50px;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012-ref.html
new file mode 100644
index 00000000000..4c989f90d4e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, 150px);
+    grid-template-rows: 100px 100px;
+    background: gray;
+    height: 300px;
+    width: 300px;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html
new file mode 100644
index 00000000000..db711748dbb
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-012.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-012-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 300px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- The second track should still be collapsed, even though this
+    item is placed in every possible track. -->
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column:1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html
new file mode 100644
index 00000000000..6b7e6881b67
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-013.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-012-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 300px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014-ref.html
new file mode 100644
index 00000000000..c49afb07bba
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto;
+    grid-template-rows: 100px 100px;
+    background: gray;
+    height: 200px;
+    width: 500px;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html
new file mode 100644
index 00000000000..53e1bb2381c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-014.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-014-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 200px;
+    width: 500px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 5;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 1;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html
new file mode 100644
index 00000000000..5ce8dacefa4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-015.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: 1;"></div>
+  <div style="grid-column: 3;"></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // These don't end up being 100px because auto tracks get stretched at the end of
+    // track sizing.
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "250px 250px 250px 250px 0px 0px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html
new file mode 100644
index 00000000000..f2ccdb38dfd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-016.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div style="grid-column: 4"></div>
+  <div style="grid-column: 6"></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // These don't end up being 100px because auto tracks get stretched at the end of
+    // track sizing.
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "200px 200px 200px 200px 0px 200px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017-ref.html
new file mode 100644
index 00000000000..c2876035b37
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<style>
+.masonry {
+    display: masonry;
+    grid-template-columns: repeat(9, auto);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 50px;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 4; width: 200px;">1</div>
+  <div style="grid-column: 4 / span 2; width: 100px;">2</div>
+  <div style="grid-column: 8 / span 2; width: 100px;">3</div>
+  <div style="grid-column: 7;">4</div>
+  <div style="grid-column: span 2; width: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017.html
new file mode 100644
index 00000000000..192169cf938
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-017.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-017-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 50px;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 4; width: 200px;">1</div>
+  <div style="grid-column: 4 / span 2; width: 100px;">2</div>
+  <div style="grid-column: 9 / span 2; width: 100px;">3</div>
+  <div style="grid-column: 7;">4</div>
+  <div style="grid-column: span 2; width: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-018.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-018.html
new file mode 100644
index 00000000000..dd8e42b5a9a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-018.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-017-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: 50px repeat(5, 50px) repeat(auto-fit, auto);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 50px;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 4; width: 200px;">1</div>
+  <div style="grid-column: 4 / span 2; width: 100px;">2</div>
+  <div style="grid-column: 9 / span 2; width: 100px;">3</div>
+  <div style="grid-column: 7;">4</div>
+  <div style="grid-column: span 2; width: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html
new file mode 100644
index 00000000000..3bd240bc82f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-019.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../column-auto-repeat-023-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: 100px repeat(auto-fit, auto);
+    height: 500px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- Only column 2 should get collapsed -->
+    <div style="background: lightskyblue; grid-column: 3;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html
new file mode 100644
index 00000000000..06b762fc327
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-020.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(5, 100px) repeat(auto-fit, auto);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // The last auto-fit column is 500px because it stretches to fill the remaining
+    // space.
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 100px 100px 500px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html
new file mode 100644
index 00000000000..40e5d26cd6c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-021.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, auto) repeat(5, 100px);
+    height: 200px;
+    width: 1000px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-columns'),
+      "100px 100px 100px 100px 100px 100px 100px 100px 100px 100px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022-ref.html
new file mode 100644
index 00000000000..34867e1de96
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: repeat(8, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    width: 50px;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-column: span 3; width: 150px;"></div>
+  <div style="grid-column: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html
new file mode 100644
index 00000000000..b87fa9a47ac
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-022.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-022-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(4, 50px) repeat(auto-fit, auto) repeat(4, 50px);
+    height: 200px;
+    width: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    width: 50px;
+    height: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-column: span 3; width: 150px;"></div>
+  <div style="grid-column: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023-ref.html
new file mode 100644
index 00000000000..0085f0be0d8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto;
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  min-width: 100px;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html
new file mode 100644
index 00000000000..7fd2a6bab0a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-023.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-023-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  min-width: 100px;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html
new file mode 100644
index 00000000000..6a853304b9e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-024.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img id="test" src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+<script>
+  test(function() {
+    let image = document.getElementById("test");
+    assert_less_than(image.getBoundingClientRect().width, 2);
+    assert_greater_than(image.getBoundingClientRect().width, 1);
+    assert_approx_equals(image.getBoundingClientRect().width / image.getBoundingClientRect().height, 113 / 120, .006);
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025-ref.html
new file mode 100644
index 00000000000..0cdca6280b1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto;
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: stretch;
+  max-width: 100px;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html
new file mode 100644
index 00000000000..d674ec8ba4c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-025.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-025-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: stretch;
+  max-width: 100px;
+  height: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026-ref.html
new file mode 100644
index 00000000000..09471af0ec8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: auto auto auto;
+    width: 400px;
+    gap: 10px;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026.html
new file mode 100644
index 00000000000..3a42bb07b9c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-026.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-auto-repeat-auto-026-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    gap: 10px;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html
new file mode 100644
index 00000000000..a3bfbc392ff
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-027.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: 400px;
+    gap: 10px;
+}
+
+img {
+  width: 100%;
+  height: auto;
+  aspect-ratio: 1;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img id="test" src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+<script>
+  test(function() {
+    let image = document.getElementById("test");
+    assert_less_than(image.getBoundingClientRect().width, 2);
+    assert_greater_than(image.getBoundingClientRect().width, 1);
+    assert_equals(image.getBoundingClientRect().width / image.getBoundingClientRect().height, 1);
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028-ref.html
new file mode 100644
index 00000000000..1f1913368d3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<style>
+.masonry {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: auto;
+    width: auto;
+    height: auto;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="background: lightskyblue;"></div>
+  <div style="background: lightcoral;"></div>
+  <div style="background: lightgreen;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028.html
new file mode 100644
index 00000000000..135f761161c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-028.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and % sized children with auto sized container</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-028-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto);
+    width: auto;
+    height: auto;
+}
+
+.masonry > div {
+    width: 100%;
+    height: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="background: lightskyblue;"></div>
+  <div style="background: lightcoral;"></div>
+  <div style="background: lightgreen;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029-ref.html
new file mode 100644
index 00000000000..e651204fbfe
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, 50px) 150px repeat(3, 100px);
+    grid-template-rows: 100px 100px;
+    width: 500px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html
new file mode 100644
index 00000000000..f895b4a30ee
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-029.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes with fixed repeat</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-auto-029-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(2, 50px) repeat(auto-fill, auto);
+    width: 500px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-no-items-crash.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-no-items-crash.html
new file mode 100644
index 00000000000..a9d25eb2749
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-auto-no-items-crash.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes with no items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+#masonry {
+    display: masonry;
+    grid-template-columns: repeat(auto-fit, minmax(20px, 30px) auto);
+}
+</style>
+<div id="masonry"></div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001-ref.html
new file mode 100644
index 00000000000..262c267f1a6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(3, fit-content(100px));
+    grid-template-rows: repeat(3, 100px);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html
new file mode 100644
index 00000000000..ff106b2ad79
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002-ref.html
new file mode 100644
index 00000000000..8ba6705dfbb
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, fit-content(100px));
+    grid-template-rows: 100px 100px;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html
new file mode 100644
index 00000000000..b5daeb7a962
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003-ref.html
new file mode 100644
index 00000000000..dd62ab6d56c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html
new file mode 100644
index 00000000000..67a2b71a363
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-003.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-columns: fit-content(100px) repeat(auto-fill, fit-content(100px)) fit-content(100px);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004-ref.html
new file mode 100644
index 00000000000..296236c01ab
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, fit-content(100px));
+    grid-template-rows: repeat(4, 100px);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html
new file mode 100644
index 00000000000..421356fd097
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-004.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, fit-content(100px) fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005-ref.html
new file mode 100644
index 00000000000..3bee97dfac7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: fit-content(100px) fit-content(100px);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html
new file mode 100644
index 00000000000..7c07519ee56
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-fit-content-005.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fit-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, fit-content(100px));
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001-ref.html
new file mode 100644
index 00000000000..4c9cb27a30b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, max-content);
+    grid-template-rows: 100px 100px 100px 100px;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html
new file mode 100644
index 00000000000..315b36bcfec
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-max-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002-ref.html
new file mode 100644
index 00000000000..45a7df8acfd
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, max-content);
+    grid-template-rows: 100px 100px;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html
new file mode 100644
index 00000000000..06cf79a5d63
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-max-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html
new file mode 100644
index 00000000000..a06d6dd4028
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-003.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-columns: max-content repeat(auto-fill, max-content) max-content;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html
new file mode 100644
index 00000000000..2405f951ac0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-004.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-max-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, max-content max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005-ref.html
new file mode 100644
index 00000000000..0f63176d645
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: masonry;
+    background: gray;
+    grid-template-columns: max-content auto;
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005.html
new file mode 100644
index 00000000000..9c49bd6135c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-max-content-005.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with max-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-max-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, max-content);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001-ref.html
new file mode 100644
index 00000000000..9ce1dc631aa
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(3, min-content);
+    grid-template-rows: 100px 100px 100px;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html
new file mode 100644
index 00000000000..f55a965988f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-min-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002-ref.html
new file mode 100644
index 00000000000..eb341a18505
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, min-content);
+    grid-template-rows: 100px 100px;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html
new file mode 100644
index 00000000000..43e16e751d3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-min-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html
new file mode 100644
index 00000000000..b2c8419d7cc
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-003.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-columns: min-content repeat(auto-fill, min-content) min-content;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004-ref.html
new file mode 100644
index 00000000000..387e4f1928a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: repeat(2, min-content);
+    grid-template-rows: repeat(4, 100px);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html
new file mode 100644
index 00000000000..027544b93b8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-004.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-min-content-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, min-content min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005-ref.html
new file mode 100644
index 00000000000..e22023c5795
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-columns: min-content min-content;
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html
new file mode 100644
index 00000000000..3493db309d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-min-content-005.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with min-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-min-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fit, min-content);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001-ref.html
new file mode 100644
index 00000000000..82ecc47f074
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001-ref.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: min-content max-content fit-content(100px) auto;
+    grid-template-rows: 100px 100px;
+    width: 500px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html
new file mode 100644
index 00000000000..345493d84fb
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with mixed intrinsic track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-mixed-intrinsic-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, min-content max-content fit-content(100px) auto);
+    width: 500px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown; width: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002-ref.html
new file mode 100644
index 00000000000..c6afa597eb6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002-ref.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(3, 135px 90px);
+    grid-template-rows: 100px 100px 100px;
+    width: 675px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: lightskyblue;">
+      Number 7
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="background: lightcoral;">
+      Number 8
+    </div>
+    <div style="background: lightgreen;">
+      Number 9
+    </div>
+    <div style="background: lightpink;">
+      Number 10
+    </div>
+    <div style="background: orange;">
+      Number 11
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html
new file mode 100644
index 00000000000..fbf86370bd9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-002.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max/min-content track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-mixed-intrinsic-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, max-content min-content);
+    width: 675px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="background: lightskyblue;">
+      Number 7
+    </div>
+    <div style="background: lightcoral;">
+      Number 8
+    </div>
+    <div style="background: lightgreen;">
+      Number 9
+    </div>
+    <div style="background: lightpink;">
+      Number 10
+    </div>
+    <div style="background: orange;">
+      Number 11
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003-ref.html
new file mode 100644
index 00000000000..731b843c32c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003-ref.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(2, 50px auto);
+    grid-template-rows: 100px 100px 100px;
+    width: 400px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html
new file mode 100644
index 00000000000..0aa1ba2fb6b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-003.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max/min-content track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-mixed-intrinsic-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, 50px auto);
+    width: 400px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004-ref.html
new file mode 100644
index 00000000000..87ae6bea890
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004-ref.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(2, 120px 50px 120px);
+    grid-template-rows: 100px 100px 100px;
+    width: 580px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: lightskyblue;">
+      Number 7
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="background: lightcoral;">
+      Number 8
+    </div>
+    <div style="background: lightgreen;">
+      Number 9
+    </div>
+    <div style="background: lightpink;">
+      Number 10
+    </div>
+    <div style="background: orange;">
+      Number 11
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html
new file mode 100644
index 00000000000..7b5df4e34ca
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/column-auto-repeat-mixed-intrinsic-004.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max/min-content track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="column-auto-repeat-mixed-intrinsic-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-columns: repeat(auto-fill, auto 50px auto);
+    width: 580px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="background: lightskyblue;">
+      Number 7
+    </div>
+    <div style="background: lightcoral;">
+      Number 8
+    </div>
+    <div style="background: lightgreen;">
+      Number 9
+    </div>
+    <div style="background: lightpink;">
+      Number 10
+    </div>
+    <div style="background: orange;">
+      Number 11
+    </div>
+    <div style="grid-column: span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/repeat-auto-fit-auto-crash.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/repeat-auto-fit-auto-crash.html
new file mode 100644
index 00000000000..07b44c16a83
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/repeat-auto-fit-auto-crash.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<head>
+  <title>
+    repeat(auto-fit, auto) track size with no masonry items should not crash.
+  </title>
+  <link rel="help" href="https://drafts.csswg.org/css-grid-3">
+  <link rel="help" href="https://issues.chromium.org/issues/432291718">
+  <link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+</head>
+<div style="display: masonry; grid-template-columns: repeat(auto-fit, auto) 100px;"></div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html
new file mode 100644
index 00000000000..9c0fafb6af8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../row-auto-repeat-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002-ref.html
new file mode 100644
index 00000000000..e3f5e5d8834
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002-ref.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: auto auto auto auto;
+    grid-template-columns: 100px 100px;
+    background: gray;
+    width: 200px;
+    height: 400px;
+}
+
+.grid > div {
+    height: 25%;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 4;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html
new file mode 100644
index 00000000000..63056b4d43b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-002.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and percentage sized children</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    width: 200px;
+    height: 400px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 25%;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003-ref.html
new file mode 100644
index 00000000000..a8f362b00a0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px 100px 100px 100px;
+    grid-template-columns: 50px 50px 50px 50px;
+    background: gray;
+    width: 200px;
+    height: 400px;
+}
+
+.grid > div {
+    height: 75%;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: span 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: span 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: span 4;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: span 2;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html
new file mode 100644
index 00000000000..e2cd71932d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-003.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and percentage sized spanning children</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    width: 200px;
+    height: 400px;
+}
+
+.masonry > div {
+    width: 50px;
+    height: 75%;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: span 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: span 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: span 4;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: span 2;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004-ref.html
new file mode 100644
index 00000000000..1b98ba4038a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: auto auto auto auto;
+    grid-template-columns: 50px 50px 50px 50px;
+    grid-gap: 20px;
+    background: gray;
+    width: 260px;
+    height: 400px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: span 2; height: 200px">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: span 3; height: 300px;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: span 4; height: 400px;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: span 2; height: 200px;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html
new file mode 100644
index 00000000000..b6187ccb567
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-004.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and spanning children with gap</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-004-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: auto auto auto auto;
+    grid-gap: 20px;
+    width: 260px;
+    height: 400px;
+}
+
+.masonry > div {
+    width: 50px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: span 2; height: 200px">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: span 3; height: 300px;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: span 4; height: 400px;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: span 2; height: 200px;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005-ref.html
new file mode 100644
index 00000000000..a36099f4084
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    width: 300px;
+    height: 300px;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+    <div style="grid-row: 1 / span 2; background: brown; height: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html
new file mode 100644
index 00000000000..063f56fed1a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-005.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-rows: auto repeat(auto-fill, auto) auto;
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html
new file mode 100644
index 00000000000..06469cf21e4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-006.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks with auto size.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    min-height: 60px;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry">
+    <div style="width: 1px; height: 50px;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-007.html
new file mode 100644
index 00000000000..0875cf36604
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-007.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    min-height: 60%;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div style="width: 100px; height: 100px; background: green;">
+  <div style="height: 100%;">
+    <div class="masonry">
+      <div style="width: 1px; height: 50px;"></div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html
new file mode 100644
index 00000000000..fd9a9ad8862
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-008.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>Checks that a dynamic change in containing block height changes the number of auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    masonry-direction: row;
+    background: green;
+    width: 100px;
+    min-height: 60%;
+    grid-template-rows: repeat(auto-fill, auto);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="width: 100px; height: 0px;">
+  <div class="masonry">
+    <div style="width: 1px; height: 50px;"></div>
+  </div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html
new file mode 100644
index 00000000000..89f5c1c6c14
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-009.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    min-width: 300px;
+    min-height: 200px;
+    float: left;
+    background: pink;
+}
+.border {
+  border: 10px solid;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 300px;
+  height: 50px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: 200px; height: 100px;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="112.5" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html
new file mode 100644
index 00000000000..27037d9ae50
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-010.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with min and max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks don't overflow the masonry container size when max size is definite, even if min size is bigger than that.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-rows: repeat(auto-fill, auto);
+    masonry-direction: row;
+    max-width: 100px;
+    min-width: 250px;
+    max-height: 50px;
+    min-height: 125px;
+    float: left;
+    background: pink;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 250px;
+  height: 50px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="37.5" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="37.5" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="37.5" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="37.5" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011-ref.html
new file mode 100644
index 00000000000..9b892a930cf
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  margin: 10px;
+  grid-template-rows: repeat(auto-fill, 100px 100px);
+  grid-template-columns: auto auto;
+  grid-row-gap: 100px;
+  height: 300px;
+  width: min-content;
+  background: pink;
+}
+.grid > div {
+  background: lime;
+  width: 50px;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="grid">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html
new file mode 100644
index 00000000000..e2e7c91d53d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-011.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and gutters.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-011-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  margin: 10px;
+  masonry-direction: row;
+  grid-template-rows: repeat(auto-fill, auto auto);
+  grid-row-gap: 100px;
+  height: 300px;
+  width: min-content;
+  background: pink;
+}
+.masonry > div {
+  background: lime;
+  width: 50px;
+  height: 50px;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012-ref.html
new file mode 100644
index 00000000000..b6ac5217840
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(auto-fill, 150px);
+    grid-template-columns: 100px 100px 100px;
+    background: gray;
+    height: 300px;
+    width: 300px;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row:1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html
new file mode 100644
index 00000000000..77f9f66867e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-012.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-012-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    height: 300px;
+    width: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- The second track should still be collapsed, even though this
+    item is placed in every possible track. -->
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row:1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html
new file mode 100644
index 00000000000..4e3296d29ed
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-013.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-012-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014-ref.html
new file mode 100644
index 00000000000..f86f2a94b89
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: auto auto auto;
+    grid-template-columns: 100px 100px;
+    background: gray;
+    width: 200px;
+    height: 500px;
+}
+
+.grid > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 1; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html
new file mode 100644
index 00000000000..ef010c05031
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-014.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-014-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    width: 200px;
+    height: 500px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 5;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 1;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html
new file mode 100644
index 00000000000..2c7ea9f8c0e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-015.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: 1;"></div>
+  <div style="grid-row: 3;"></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // These don't end up being 100px because auto tracks get stretched at the end of
+    // track sizing.
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "250px 250px 250px 250px 0px 0px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html
new file mode 100644
index 00000000000..aa3525c257e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-016.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div style="grid-row: 4"></div>
+  <div style="grid-row: 6"></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // These don't end up being 100px because auto tracks get stretched at the end of
+    // track sizing.
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "200px 200px 200px 200px 0px 200px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017-ref.html
new file mode 100644
index 00000000000..4b69af716db
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(9, auto);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 50px;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 4; height: 200px;">1</div>
+  <div style="grid-row: 4 / span 2; height: 100px;">2</div>
+  <div style="grid-row: 8 / span 2; height: 100px;">3</div>
+  <div style="grid-row: 7;">4</div>
+  <div style="grid-row: span 2; height: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017.html
new file mode 100644
index 00000000000..3bac170643d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-017.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-auto-017-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 50px;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 4; height: 200px;">1</div>
+  <div style="grid-row: 4 / span 2; height: 100px;">2</div>
+  <div style="grid-row: 9 / span 2; height: 100px;">3</div>
+  <div style="grid-row: 7;">4</div>
+  <div style="grid-row: span 2; height: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-018.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-018.html
new file mode 100644
index 00000000000..bbbfb4807b8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-018.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-017-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: 50px repeat(5, 50px) repeat(auto-fit, auto);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 50px;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 4; height: 200px;">1</div>
+  <div style="grid-row: 4 / span 2; height: 100px;">2</div>
+  <div style="grid-row: 9 / span 2; height: 100px;">3</div>
+  <div style="grid-row: 7;">4</div>
+  <div style="grid-row: span 2; height: 100px;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html
new file mode 100644
index 00000000000..dd8fe0f6805
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-019.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../row-auto-repeat-021-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: 100px repeat(auto-fit, auto);
+    width: 500px;
+    height: 300px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- Only row 2 should get collapsed -->
+    <div style="background: lightskyblue; grid-row: 3;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html
new file mode 100644
index 00000000000..353777b6040
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-020.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(5, 100px) repeat(auto-fit, auto);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    // The last auto-fit row is 500px because it stretches to fill the remaining
+    // space.
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 100px 500px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html
new file mode 100644
index 00000000000..e9e656659ad
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-021.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, auto) repeat(5, 100px);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100px;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 100px 100px 100px 100px 100px 100px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022-ref.html
new file mode 100644
index 00000000000..ee93be5562c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(8, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    height: 50px;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-row: span 3; height: 150px;"></div>
+  <div style="grid-row: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html
new file mode 100644
index 00000000000..e4e8fc2cea2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-022.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with auto size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-022-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(4, 50px) repeat(auto-fit, auto) repeat(4, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 50px;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 3; height: 150px;"></div>
+  <div style="grid-row: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023-ref.html
new file mode 100644
index 00000000000..af31fb1b4e8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: auto;
+    height: 400px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  min-height: 100px;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023.html
new file mode 100644
index 00000000000..469ae2af75b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-023.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-023-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    height: 400px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  min-height: 100px;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024-ref.html
new file mode 100644
index 00000000000..68dcd096f27
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: auto;
+    height: 400px;
+    width: 150px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024.html
new file mode 100644
index 00000000000..227d862ea46
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-024.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-024-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    height: 400px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025-ref.html
new file mode 100644
index 00000000000..41b2337ad09
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: auto auto auto;
+    height: 400px;
+    width: 150px;
+    gap: 10px;
+}
+
+img {
+  height: stretch;
+  max-height: 100px;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html
new file mode 100644
index 00000000000..91a158d5704
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-025.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-025-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    height: 400px;
+    gap: 10px;
+}
+
+img {
+  height: stretch;
+  max-height: 100px;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+  <img src="../../../resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026-ref.html
new file mode 100644
index 00000000000..04a7a05e22e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: auto auto auto;
+    height: 400px;
+    width: 150px;
+    gap: 10px;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026.html
new file mode 100644
index 00000000000..1ac5b409c42
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-026.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-026-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    height: 400px;
+    gap: 10px;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027-ref.html
new file mode 100644
index 00000000000..0d1a499684c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: auto;
+    height: 400px;
+    width: 150px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  aspect-ratio: 1;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027.html
new file mode 100644
index 00000000000..6bfca6eed20
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-027.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-auto-027-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    height: 400px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  aspect-ratio: 1;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-028.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-028.html
new file mode 100644
index 00000000000..381b086dcb6
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-028.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes and % sized children with auto sized container</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<!-- No content is produced because there is nothing to size the rows
+or items against in the block axis. -->
+<link rel="match" href="../../../../../../reference/blank.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto);
+    width: auto;
+    height: auto;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div style="background: lightskyblue;"></div>
+  <div style="background: lightcoral;"></div>
+  <div style="background: lightgreen;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-no-items-crash.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-no-items-crash.html
new file mode 100644
index 00000000000..1a89c065cd3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-auto-no-items-crash.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with auto track sizes with no items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+#masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, minmax(20px, 30px) auto);
+}
+</style>
+<div id="masonry"></div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001-ref.html
new file mode 100644
index 00000000000..9e85f53df8f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001-ref.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(7, fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: brown;">
+      Number 6
+    </div>
+    <!-- In Grid, the last column is 0 because no item is placed in it, so spanning
+     item 6 won't match masonry - which places all items in every track. Add another
+     item since spanning row by 2 above doesn't work in grid -->
+    <div style="background: brown; color: transparent;">
+      Number 7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html
new file mode 100644
index 00000000000..b701e0349d4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-001.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002-ref.html
new file mode 100644
index 00000000000..0b6e7e6a11b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(7, fit-content(100px));
+    grid-template-columns: repeat(4, auto);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html
new file mode 100644
index 00000000000..304e235b287
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-002.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003-ref.html
new file mode 100644
index 00000000000..b7aab42f742
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+    <div style="grid-row: 1 / span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html
new file mode 100644
index 00000000000..69f825c6b2b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-003.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-rows: fit-content(100px) repeat(auto-fill, fit-content(100px)) fit-content(100px);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html
new file mode 100644
index 00000000000..5a44b276b21
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-004.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fit-content() track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, fit-content(100px) fit-content(100px));
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005-ref.html
new file mode 100644
index 00000000000..4eb9a9ef880
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: fit-content(100px) fit-content(100px);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html
new file mode 100644
index 00000000000..983e33ee41c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-fit-content-005.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fit-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, fit-content(100px));
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001-ref.html
new file mode 100644
index 00000000000..e4b6f4731e0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001-ref.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(7, max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: brown;">
+      Number 6
+    </div>
+    <!-- In Grid, the last column is 0 because no item is placed in it, so spanning
+     item 6 won't match masonry - which places all items in every track. Add another
+     item since spanning row by 2 above doesn't work in grid -->
+    <div style="background: brown; color: transparent;">
+      Number 7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html
new file mode 100644
index 00000000000..850cdb91e99
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-001.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-max-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002-ref.html
new file mode 100644
index 00000000000..38998ff9e69
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(2, max-content);
+    grid-template-columns: repeat(4, auto);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html
new file mode 100644
index 00000000000..789e3cb0ed1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-002.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-max-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html
new file mode 100644
index 00000000000..ab14aa67466
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-003.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-rows: max-content repeat(auto-fill, max-content) max-content;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html
new file mode 100644
index 00000000000..bb7f426107e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-004.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-max-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, max-content max-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005-ref.html
new file mode 100644
index 00000000000..99fbcd861d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: max-content max-content;
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html
new file mode 100644
index 00000000000..8d47b9f4c4c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-max-content-005.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with max-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-max-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, max-content);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001-ref.html
new file mode 100644
index 00000000000..cb5e7a493ab
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001-ref.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(7, min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: brown;">
+      Number 6
+    </div>
+    <!-- In Grid, the last column is 0 because no item is placed in it, so spanning
+     item 6 won't match masonry - which places all items in every track. Add another
+     item since spanning row by 2 above doesn't work in grid -->
+    <div style="background: brown; color: transparent;">
+      Number 7
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html
new file mode 100644
index 00000000000..648a29f49e0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-001.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-min-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002-ref.html
new file mode 100644
index 00000000000..16b82b171c4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: repeat(2, min-content);
+    grid-template-columns: repeat(4, auto);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html
new file mode 100644
index 00000000000..fe23d91b526
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-002.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size and % spanner</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-min-content-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 100%;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html
new file mode 100644
index 00000000000..c3e32630c1a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-003.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-fit-content-003-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    /*
+      This is not currently a valid track definition and will fall back to
+      none. However, this is going to change in the future[1].
+
+      [1] https://github.com/w3c/csswg-drafts/issues/12580#issuecomment-3201090594
+    */
+    grid-template-rows: min-content repeat(auto-fill, min-content) min-content;
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html
new file mode 100644
index 00000000000..5515144fc19
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-004.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with min-content track size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-min-content-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, min-content min-content);
+    width: 300px;
+    height: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005-ref.html
new file mode 100644
index 00000000000..2006336d570
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    grid-template-rows: min-content min-content;
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html
new file mode 100644
index 00000000000..679dd29048e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-min-content-005.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with min-content size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-min-content-005-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, min-content);
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001-ref.html
new file mode 100644
index 00000000000..3a48049c70c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001-ref.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: min-content max-content fit-content(100px) auto;
+    grid-template-columns: 100px 100px;
+    height: 500px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 200px;">
+      Number 6
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink; height: 100%;">
+      Number 4
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html
new file mode 100644
index 00000000000..7163087bf60
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-001.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with mixed intrinsic track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-mixed-intrinsic-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, min-content max-content fit-content(100px) auto);
+    height: 500px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown; height: 200px;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002-ref.html
new file mode 100644
index 00000000000..55044da1379
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002-ref.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<html>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    background: gray;
+    item-tolerance: 0;
+    grid-template-rows: repeat(5, auto fit-content(100px));
+    grid-template-columns: 100px 100px;
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.grid > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 1;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-column: 1;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-column: 1;">
+      Number 5
+    </div>
+    <div style="background: brown; grid-column: 1;">
+      Number 6
+    </div>
+    <!-- Fit content in grid requires an item to be placed in that track for it to be
+    non-zero. In masonry, this is not the case. Add an item to mimic the spanner
+    in the masonry test case. -->
+    <div style="background: brown; color: transparent; grid-column: 1;">
+      Number 6
+    </div>
+    <div style="background: lightskyblue; grid-column: 1;">
+      Number 7
+    </div>
+    <div style="background: lightcoral; grid-column: 1;">
+      Number 8
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 9
+    </div>
+    <div style="background: lightpink; grid-column: 2; grid-row: 1;">
+      Number 10
+    </div>
+    <div style="background: orange;grid-column: 2; grid-row: 2;">
+      Number 11
+    </div>
+    <div style="grid-column: 2; grid-row: 3 / span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html
new file mode 100644
index 00000000000..561bd4c9a01
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/intrinsic-auto-repeat/row-auto-repeat-mixed-intrinsic-002.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with max/min-content track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-mixed-intrinsic-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, auto fit-content(100px));
+    height: 300px;
+    width: 300px;
+    font: 15px/1 Ahem;
+}
+
+.masonry > div {
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+    <div style="background: lightskyblue;">
+      Number 7
+    </div>
+    <div style="background: lightcoral;">
+      Number 8
+    </div>
+    <div style="background: lightgreen;">
+      Number 9
+    </div>
+    <div style="background: lightpink;">
+      Number 10
+    </div>
+    <div style="background: orange;">
+      Number 11
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 12
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001-ref.html
new file mode 100644
index 00000000000..5586204531c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(auto-fill, 100px);
+    grid-template-columns: 100px 100px 100px;
+    background: gray;
+    width: 300px;
+    height: 300px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 2;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html
new file mode 100644
index 00000000000..c5d7d9ee88e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-001-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 100px);
+    width: 300px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100%;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002-ref.html
new file mode 100644
index 00000000000..0c4869de695
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(auto-fill, 25%);
+    grid-template-columns: 100px 100px;
+    background: gray;
+    width: 200px;
+    height: 300px;
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 4;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html
new file mode 100644
index 00000000000..ea08ea295a3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with percentage track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-002-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 25%);
+    width: 200px;
+    height: 300px;
+}
+
+.masonry > div {
+    width: 100px;
+    height: 100%;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral;">
+      Number 2
+    </div>
+    <div style="background: lightgreen;">
+      Number 3
+    </div>
+    <div style="background: lightpink;">
+      Number 4
+    </div>
+    <div style="background: orange;">
+      Number 5
+    </div>
+    <div style="grid-row: span 2; background: brown;">
+      Number 6
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html
new file mode 100644
index 00000000000..720029d3930
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-003.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 50px);
+    min-height: 60px;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry"></div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-004.html
new file mode 100644
index 00000000000..f8864cb7e4b
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-004.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>Checks that the min-height is reflected through the aspect-ratio for determining auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    background: green;
+    aspect-ratio: 1/1;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 50px);
+    min-height: 60%;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div style="width: 100px; height: 100px; background: green;">
+  <div style="height: 100%;">
+    <div class="masonry"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html
new file mode 100644
index 00000000000..79b507f7cca
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-005.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>Auto repeater with minmax size.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    height: 100px;
+    grid-template-rows: repeat(auto-fill, minmax(50px, 25px));
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry">
+  <div style="background: green; width: 50px; height: 100%;"></div>
+  <div style="background: green; width: 50px; height: 100%;"></div>
+  <div style="background: green; width: 50px; height: 100%;"></div>
+  <div style="background: green; width: 50px; height: 100%;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html
new file mode 100644
index 00000000000..74aa1388480
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-006.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>Checks that a dynamic change in containing block height changes the number of auto repeat tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="../../../../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: inline-masonry;
+    masonry-direction: row;
+    background: green;
+    width: 100px;
+    min-height: 60%;
+    grid-template-rows: repeat(auto-fill, 50px);
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="width: 100px; height: 0px;">
+  <div class="masonry"></div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html
new file mode 100644
index 00000000000..7177a6eeb86
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-007.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 50px);
+    min-width: 300px;
+    min-height: 200px;
+    float: left;
+    background: pink;
+}
+.border {
+  border: 10px solid;
+}
+.border-box {
+  box-sizing: border-box;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 300px;
+  height: 100%;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: 200px; height: 100px;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border border-box" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border border-box" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+  <div class="item" data-offset-x="0" data-offset-y="100" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border border-box" style="width: min-content; height: min-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+<div class="masonry border border-box" style="width: max-content; height: max-content;" data-expected-width="320" data-expected-height="220">
+  <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html
new file mode 100644
index 00000000000..f2564bee063
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-008.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage min sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use percentage min size when available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 50px);
+    min-width: 50%;
+    min-height: 80%;
+    float: left;
+    background: pink;
+}
+.wrapper {
+  width: 600px;
+  height: 250px;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 300px;
+  height: 100%;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="wrapper">
+  <div class="masonry" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: 200px; height: 100px;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html
new file mode 100644
index 00000000000..715ae6f4bbc
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-009.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage min sizes with percentage track sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert"
+  content="This test checks that auto repeat tracks can use percentage track
+  size when only a min size is available to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: inline-masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 20%);
+    min-height: 50%;
+    width: 100px;
+    float: left;
+    background: pink;
+}
+.wrapper {
+  height: 1000px;
+}
+.item {
+  background: lime;
+  height: 100%;
+  width: 100px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+  <div id="log"></div>
+
+  <div class="wrapper">
+    <div class="masonry" data-expected-width="100" data-expected-height="500">
+      <div class="item" data-expected-width="100" data-expected-height="100">Cell 1</div>
+      <div class="item" data-expected-width="100" data-expected-height="100">Cell 2</div>
+      <div class="item" data-expected-width="100" data-expected-height="100">Cell 3</div>
+      <div class="item" data-expected-width="100" data-expected-height="100">Cell 4</div>
+      <div class="item" data-expected-width="100" data-expected-height="100">Cell 5</div>
+    </div>
+  </div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html
new file mode 100644
index 00000000000..ae04f7cd50f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-010.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks and percentage max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks use percentage max size when size is indefinite to compute the number of tracks.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 50px);
+    max-width: 50%;
+    max-height: 80%;
+    background: pink;
+}
+.wrapper {
+  width: 600px;
+  height: 250px;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 300px;
+  height: 100%;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="wrapper">
+  <div class="masonry" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: 200px; height: 100px;" data-expected-width="200" data-expected-height="100">
+    <div class="item" data-offset-x="0" data-offset-y="50" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: min-content; height: min-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+<div class="wrapper">
+  <div class="masonry" style="width: max-content; height: max-content;" data-expected-width="300" data-expected-height="200">
+    <div class="item" data-offset-x="0" data-offset-y="150" data-expected-width="300" data-expected-height="50"></div>
+  </div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html
new file mode 100644
index 00000000000..ee173d60ed2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-011.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with min and max sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<meta name="assert" content="This test checks that auto repeat tracks don't overflow the masonry container size when max size is definite, even if min size is bigger than that.">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    position: relative;
+    display: masonry;
+    grid-template-rows: repeat(auto-fill, 50px);
+    masonry-direction: row;
+    max-width: 100px;
+    min-width: 250px;
+    max-height: 50px;
+    min-height: 125px;
+    float: left;
+    background: pink;
+}
+.item {
+  background: lime;
+  /* Place item on the last row. */
+  grid-row: -2;
+  width: 250px;
+  height: 100%;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.masonry');">
+
+<div id="log"></div>
+
+<div class="masonry" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="50" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: 200px; height: 100px;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="50" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: min-content; height: min-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="50" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+<div class="masonry" style="width: max-content; height: max-content;" data-expected-width="250" data-expected-height="125">
+  <div class="item" data-offset-x="0" data-offset-y="50" data-expected-width="250" data-expected-height="50"></div>
+</div>
+
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012-ref.html
new file mode 100644
index 00000000000..2c1da3f0b2f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  margin: 10px;
+  grid-template-rows: repeat(auto-fill, 50px 50px);
+  grid-template-columns: auto auto;
+  grid-row-gap: 100px;
+  height: 300px;
+  width: min-content;
+  background: pink;
+}
+.grid > div {
+  background: lime;
+  width: 50px;
+  height: 100%;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="grid">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html
new file mode 100644
index 00000000000..90e355d1ce5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-012.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and gutters.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-012-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  margin: 10px;
+  masonry-direction: row;
+  grid-template-rows: repeat(auto-fill, 50px 50px);
+  grid-row-gap: 100px;
+  height: 300px;
+  width: min-content;
+  background: pink;
+}
+.masonry > div {
+  background: lime;
+  width: 50px;
+  height: 100%;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013-ref.html
new file mode 100644
index 00000000000..61ec6cc66db
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: grid;
+  border: solid thick;
+  grid-template-rows: 10px 20px repeat(auto-fill, 30px 40px) 50px 60px;
+  height: 300px;
+  background: pink;
+}
+.grid > :nth-child(2n) {
+  background: sienna;
+}
+.grid > :nth-child(2n+1) {
+  background: orange;
+}
+.grid > div {
+  width: 25px;
+  height: 100%;
+}
+.holder {
+  height: 300px;
+  width: 50px;
+  border-bottom: 2px solid #cfbfcf;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="holder">
+  <div class="grid">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div style="grid-row: 7;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid">
+    <div style="grid-row: 2;"></div>
+    <div></div>
+    <div style="grid-row: 5;"></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html
new file mode 100644
index 00000000000..37bdfb0e066
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-013.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-013-ref.html">
+<style>
+.masonry {
+  display: masonry;
+  border: solid thick;
+  masonry-direction: row;
+  grid-template-rows: 10px 20px repeat(auto-fill, 30px 40px) 50px 60px;
+  height: 300px;
+  background: pink;
+}
+.masonry > :nth-child(2n) {
+  background: sienna;
+}
+.masonry > :nth-child(2n+1) {
+  background: orange;
+}
+.masonry > div {
+  width: 25px;
+  height: 100%;
+}
+.holder {
+  height: 300px;
+  width: 50px;
+  border-bottom: 2px solid #cfbfcf;
+}
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div class="holder">
+  <div class="masonry">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="masonry">
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div></div>
+    <div style="grid-row: 7;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="masonry">
+    <div style="grid-row: 2;"></div>
+    <div></div>
+    <div style="grid-row: 5;"></div>
+    <div></div>
+    <div></div>
+    <div></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014-ref.html
new file mode 100644
index 00000000000..6c34d2f32ab
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014-ref.html
@@ -0,0 +1,162 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: inline-grid;
+  border: 1px solid black;
+  grid-template-rows: [u] repeat(auto-fill, [v] 10px [w] 10px [x] 10px [y]) [z];
+  grid-row-gap: 3px;
+  width: min-content;
+  /* Does not fit a whole-number of repetitions */
+  height: 94px;
+  background: pink;
+}
+div > div {
+  background: blue;
+  width: 25px;
+  height: 100%;
+}
+</style>
+<body>
+    <!-- u -->
+    <div class="grid">
+        <div style="grid-row-start: u"></div>
+    </div>
+    <!-- non-existent line name -->
+    <div class="grid">
+        <div style="grid-row-start: nonesuch"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one u -->
+    <div class="grid">
+        <div style="grid-row-start: u 4"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u 9"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u -2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u -6"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: u -7"></div>
+    </div>
+    <!-- v -->
+    <div class="grid">
+        <div style="grid-row-start: v"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: v 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: v 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: v -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: v -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two v's -->
+    <div class="grid">
+        <div style="grid-row-start: v 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: v -3"></div>
+    </div>
+    <!-- w -->
+    <div class="grid">
+        <div style="grid-row-start: w"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: w 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: w 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: w -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: w -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two w's -->
+    <div class="grid">
+        <div style="grid-row-start: w 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: w -3"></div>
+    </div>
+    <!-- x -->
+    <div class="grid">
+        <div style="grid-row-start: x"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: x 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: x 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: x -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: x -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two x's -->
+    <div class="grid">
+        <div style="grid-row-start: x 3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: x -3"></div>
+    </div>
+    <!-- y -->
+    <div class="grid">
+        <div style="grid-row-start: y"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: y 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: y 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: y -1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: y -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two y's -->
+    <div class="grid">
+        <div style="grid-row-start: y -3"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: y 3"></div>
+    </div>
+    <!-- z -->
+    <div class="grid">
+        <div style="grid-row-start: z"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: z 1"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: z -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one z -->
+    <div class="grid">
+        <div style="grid-row-start: z 2"></div>
+    </div>
+    <div class="grid">
+        <div style="grid-row-start: z -2"></div>
+    </div>
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html
new file mode 100644
index 00000000000..67d6c7d208e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-014.html
@@ -0,0 +1,167 @@
+<!DOCTYPE html>
+<title>Auto repeat tracks with multiple tracks and line names.</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-014-ref.html">
+<style>
+.masonry {
+  display: inline-masonry;
+  border: 1px solid black;
+  grid-template-rows: [u] repeat(auto-fill, [v] 10px [w] 10px [x] 10px [y]) [z];
+  masonry-direction: row;
+  grid-row-gap: 3px;
+  width: min-content;
+  /* Does not fit a whole-number of repetitions */
+  height: 94px;
+  background: pink;
+}
+div > div {
+  background: blue;
+  width: 25px;
+  height: 100%;
+}
+</style>
+<body>
+    <!-- u -->
+    <div class="masonry">
+        <div style="grid-row-start: u"></div>
+    </div>
+    <!-- non-existent line name -->
+    <div class="masonry">
+        <div style="grid-row-start: nonesuch"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one u -->
+    <div class="masonry">
+        <div style="grid-row-start: u 4"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u 9"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u -2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u -6"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: u -7"></div>
+    </div>
+    <!-- v -->
+    <div class="masonry">
+        <div style="grid-row-start: v"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: v 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: v 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: v -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: v -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two v's -->
+    <div class="masonry">
+        <div style="grid-row-start: v 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: v -3"></div>
+    </div>
+    <!-- w -->
+    <div class="masonry">
+        <div style="grid-row-start: w"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: w 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: w 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: w -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: w -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two w's -->
+    <div class="masonry">
+        <div style="grid-row-start: w 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: w -3"></div>
+    </div>
+    <!-- x -->
+    <div class="masonry">
+        <div style="grid-row-start: x"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: x 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: x 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: x -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: x -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two x's -->
+    <div class="masonry">
+        <div style="grid-row-start: x 3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: x -3"></div>
+    </div>
+    <!-- y -->
+    <div class="masonry">
+        <div style="grid-row-start: y"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: y 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: y 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: y -1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: y -2"></div>
+    </div>
+    <!-- Also non-existent, there are only two y's -->
+    <div class="masonry">
+        <div style="grid-row-start: y -3"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: y 3"></div>
+    </div>
+    <!-- z -->
+    <div class="masonry">
+        <div style="grid-row-start: z"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: z 1"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: z -1"></div>
+    </div>
+    <!-- Also non-existent, there is only one z -->
+    <div class="masonry">
+        <div style="grid-row-start: z 2"></div>
+    </div>
+    <div class="masonry">
+        <div style="grid-row-start: z -2"></div>
+    </div>
+</body>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015-ref.html
new file mode 100644
index 00000000000..4fa74f2373e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px 100px;
+    grid-template-columns: 100px 100px 100px;
+    background: gray;
+    height: 300px;
+    width: 300px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html
new file mode 100644
index 00000000000..8a21f4fa8c3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-015.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-015-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 100px);
+    height: 300px;
+    width: 300px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 1;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016-ref.html
new file mode 100644
index 00000000000..6d74025c380
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px 100px 100px;
+    grid-template-columns: 100px 100px;
+    background: gray;
+    width: 200px;
+    height: 500px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-column: 1;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-column: 1;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 1; grid-column: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 2; grid-column: 2;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html
new file mode 100644
index 00000000000..0313ec5331e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-016.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-016-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 100px);
+    width: 200px;
+    height: 500px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <div style="background: lightskyblue; grid-row: 1;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 5;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 1;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html
new file mode 100644
index 00000000000..73226243bd3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-017.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 100px);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 100px 0px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html
new file mode 100644
index 00000000000..e153e2d694c
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-018.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 100px);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div style="grid-row: 4"></div>
+  <div style="grid-row: 6"></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 0px 100px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019-ref.html
new file mode 100644
index 00000000000..03849453a5e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(auto-fit, 50px);
+    grid-template-columns: 50px 50px;
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    height: 100%;
+    width: 50px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-row: 1 / span 4;">1</div>
+  <div style="grid-row: 4 / span 2;">2</div>
+  <div style="grid-row: 9 / span 2; grid-column: 1;">3</div>
+  <div style="grid-row: 7; grid-column: 1;">4</div>
+  <div style="grid-row: 9 / span 2;">5</div>
+  <div style="grid-row: 6; grid-column: 1;">6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html
new file mode 100644
index 00000000000..a609db600ac
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-019.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-019-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 50px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 4;">1</div>
+  <div style="grid-row: 4 / span 2;">2</div>
+  <div style="grid-row: 9 / span 2;">3</div>
+  <div style="grid-row: 7;">4</div>
+  <div style="grid-row: span 2;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html
new file mode 100644
index 00000000000..d6ad23826a1
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-020.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-019-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: 50px repeat(5, 50px) repeat(auto-fit, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 50px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 4;">1</div>
+  <div style="grid-row: 4 / span 2;">2</div>
+  <div style="grid-row: 9 / span 2;">3</div>
+  <div style="grid-row: 7;">4</div>
+  <div style="grid-row: span 2;">5</div>
+  <div>6</div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021-ref.html
new file mode 100644
index 00000000000..e212b1648c8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 100px 100px;
+    grid-template-columns: 100px 100px 100px;
+    background: gray;
+    width: 500px;
+    height: 300px
+}
+</style>
+<body>
+  <div class="grid">
+    <div style="background: lightskyblue; grid-row: 2;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 2;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 2;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 2;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 2;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html
new file mode 100644
index 00000000000..8c0eadf1264
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-021.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and explicit item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="match" href="row-auto-repeat-021-ref.html">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<style>
+.masonry {
+    display: masonry;
+    background: gray;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: 100px repeat(auto-fit, 100px);
+    width: 500px;
+    height: 300px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<body>
+  <div class="masonry">
+    <!-- Only row 2 should get collapsed -->
+    <div style="background: lightskyblue; grid-row: 3;">
+      Number 1
+    </div>
+    <div style="background: lightcoral; grid-row: 3;">
+      Number 2
+    </div>
+    <div style="background: lightgreen; grid-row: 3;">
+      Number 3
+    </div>
+    <div style="background: lightpink; grid-row: 3;">
+      Number 4
+    </div>
+    <div style="background: orange; grid-row: 3;">
+      Number 5
+    </div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html
new file mode 100644
index 00000000000..8fde6529d02
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-022.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(5, 100px) repeat(auto-fit, 100px);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 100px 100px 0px 0px 0px 0px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html
new file mode 100644
index 00000000000..e904b5dc10e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-023.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fit, 100px) repeat(5, 100px);
+    width: 200px;
+    height: 1000px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+}
+</style>
+<div class="masonry">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+</div>
+<script>
+  test(function() {
+    const container = document.querySelector('.masonry');
+    const computedStyle = window.getComputedStyle(container);
+    assert_equals(computedStyle.getPropertyValue('grid-template-rows'),
+      "100px 100px 100px 100px 100px 100px 100px 100px 100px 100px");
+  });
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024-ref.html
new file mode 100644
index 00000000000..1cfb614949d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: repeat(8, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.grid > div {
+    height: 100%;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="grid">
+  <div style="grid-row: span 3;"></div>
+  <div style="grid-row: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html
new file mode 100644
index 00000000000..f65d957bdd5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-024.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<title>Auto-fit repeat tracks with fixed size and auto/explicit spanning item placement</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-024-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(4, 50px) repeat(auto-fit, 50px) repeat(4, 50px);
+    width: 200px;
+    height: 500px;
+    gap: 10px;
+}
+
+.masonry > div {
+    height: 100%;
+    width: 100px;
+    background-color: orange;
+}
+</style>
+<div class="masonry">
+  <div style="grid-row: span 3;"></div>
+  <div style="grid-row: -1;"></div>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025-ref.html
new file mode 100644
index 00000000000..ea179c1c956
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<style>
+.grid {
+    display: grid;
+    grid-auto-flow: column;
+    grid-template-rows: repeat(auto-fill, 100px);
+    height: 400px;
+    width: 150px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="grid">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025.html
new file mode 100644
index 00000000000..2225a94b752
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/auto-repeat/row-auto-repeat-025.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<title>Auto repeat tracks with fixed size and replaced items</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-auto-repeat-025-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    masonry-direction: row;
+    grid-template-rows: repeat(auto-fill, 100px);
+    height: 400px;
+    width: 200px;
+    gap: 10px;
+}
+
+img {
+  height: 100%;
+  width: auto;
+  display: block;
+}
+</style>
+<div class="masonry">
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+  <img src="resources/pink-image.png" width="113" height="120"></img>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001-ref.html
new file mode 100644
index 00000000000..945b6fb2601
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001-ref.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 5% repeat(3, 10px 15%) repeat(1, 15px 5px 20px);
+    width: 500px;
+    gap: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized.</p>
+  <div class="grid">
+    <div style="width: 100%; height: 50px; background: orange;"></div>
+    <div style="width: 100%; height: 30px; background: yellow;"></div>
+    <div style="width: 100%; height: 25px; background: green;"></div>
+    <div style="width: 100%; height: 100px; background: blue;"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 60px; background: pink;"></div>
+    <div style="width: 100%; height: 40px; background: lime;"></div>
+    <div style="width: 100%; height: 90px; background: teal;"></div>
+    <div style="width: 100%; height: 15px; background: coral;"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia;"></div>
+
+    <div style="width: 100%; height: 60px; background: pink; transform: translateY(-50px);"></div>
+    <div style="width: 100%; height: 100px; background: blue; transform: translateY(-70px);"></div>
+    <div style="width: 100%; height: 25px; background: green; transform: translateY(-75px);"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 50px; background: orange; transform: translateY(-20px);"></div>
+    <div style="width: 100%; height: 15px; background: coral; transform: translateY(-40px);"></div>
+    <div style="width: 100%; height: 80px; background: purple; transform: translateY(-60px);"></div>
+    <div style="width: 100%; height: 25px; background: green; transform: translateY(-10px);"></div>
+    <div style="width: 100%; height: 30px; background: yellow; transform: translateY(-85px);"></div>
+    <div style="width: 100%; height: 50px; background: orange; transform: translateY(-90px);"></div>
+
+    <div style="width: 100%; height: 40px; background: lime; transform: translateY(-90px);"></div>
+    <div style="width: 100%; height: 90px; background: teal; grid-column: 3; transform: translateY(-150px);"></div>
+    <div style="width: 100%; height: 30px; background: yellow; grid-column: 6; transform: translateY(-125px);"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia; transform: translateY(-80px);"></div>
+    <div style="width: 100%; height: 15px; background: coral; transform: translateY(-85px);"></div>
+    <div style="width: 100%; height: 40px; background: lime; transform: translateY(-155px);"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia; transform: translateY(-140px);"></div>
+
+    <div style="width: 100%; height: 90px; background: teal; grid-column: 6; transform: translateY(-185px);"></div>
+    <div style="width: 100%; height: 60px; background: pink; grid-column: 9; transform: translateY(-205px);"></div>
+    <div style="width: 100%; height: 100px; background: blue; transform: translateY(-220px);"></div>
+
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html
new file mode 100644
index 00000000000..553ed027802
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-001.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-track-sizing-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: 5% repeat(3, 10px 15%) repeat(1, 15px 5px 20px);
+    width: 500px;
+    gap: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized.</p>
+  <div class="masonry">
+    <div style="width: 100%; height: 50px; background: orange;"></div>
+    <div style="width: 100%; height: 30px; background: yellow;"></div>
+    <div style="width: 100%; height: 25px; background: green;"></div>
+    <div style="width: 100%; height: 100px; background: blue;"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 60px; background: pink;"></div>
+    <div style="width: 100%; height: 40px; background: lime;"></div>
+    <div style="width: 100%; height: 90px; background: teal;"></div>
+    <div style="width: 100%; height: 15px; background: coral;"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia;"></div>
+
+    <div style="width: 100%; height: 50px; background: orange;"></div>
+    <div style="width: 100%; height: 30px; background: yellow;"></div>
+    <div style="width: 100%; height: 25px; background: green;"></div>
+    <div style="width: 100%; height: 100px; background: blue;"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 60px; background: pink;"></div>
+    <div style="width: 100%; height: 40px; background: lime;"></div>
+    <div style="width: 100%; height: 90px; background: teal;"></div>
+    <div style="width: 100%; height: 15px; background: coral;"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia;"></div>
+
+    <div style="width: 100%; height: 50px; background: orange;"></div>
+    <div style="width: 100%; height: 30px; background: yellow;"></div>
+    <div style="width: 100%; height: 25px; background: green;"></div>
+    <div style="width: 100%; height: 100px; background: blue;"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 60px; background: pink;"></div>
+    <div style="width: 100%; height: 40px; background: lime;"></div>
+    <div style="width: 100%; height: 90px; background: teal;"></div>
+    <div style="width: 100%; height: 15px; background: coral;"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002-ref.html
new file mode 100644
index 00000000000..5307cac5316
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: minmax(15px, min-content) max-content auto;
+    background-color: gray;
+    width: 100px;
+    font: 10px/1 Ahem;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and auto tracks are stretched.</p>
+  <div class="grid">
+    <div style="grid-column: 1; background: green;">XXX XXX</div>
+    <div style="grid-column: 1 / 3; background: purple;">X XX X</div>
+    <div style="grid-column: 1; width: 30px; height: 1em; background: yellow;"></div>
+    <div style="grid-column: 2; width: 45px; height: 1em; background: orange;"></div>
+    <div style="grid-column: 3; width: 25px; height: 1em; background: blue; position: relative; top: -3em;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html
new file mode 100644
index 00000000000..00f9f8089e0
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-002.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="match" href="column-track-sizing-002-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    grid-template-columns: minmax(15px, min-content) max-content auto;
+    background-color: gray;
+    width: 100px;
+    font: 10px/1 Ahem;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and auto tracks are stretched.</p>
+  <div class="masonry">
+    <div style="grid-column: 1; background: green;">XXX XXX</div>
+    <div style="grid-column: 1 / 3; background: purple;">X XX X</div>
+    <div style="grid-column: 1; width: 100%; height: 1em; background: yellow;"></div>
+    <div style="grid-column: 2; width: 100%; height: 1em; background: orange;"></div>
+    <div style="grid-column: 3; width: 100%; height: 1em; background: blue;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003-ref.html
new file mode 100644
index 00000000000..04ada490800
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 1fr 5fr 3fr 1fr;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and flexible tracks are expanded.</p>
+  <div class="grid">
+    <div style="background-color: orange;"></div>
+    <div style="background-color: yellow;"></div>
+    <div style="background-color: blue;"></div>
+    <div style="background-color: purple;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html
new file mode 100644
index 00000000000..75015e6a52a
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-003.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-track-sizing-003-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    grid-template-columns: 1fr 5fr 3fr 1fr;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and flexible tracks are expanded.</p>
+  <div class="masonry">
+    <div style="background-color: orange; height: 100px;"></div>
+    <div style="background-color: yellow; height: 100px;"></div>
+    <div style="background-color: blue; height: 100px;"></div>
+    <div style="background-color: purple; height: 100px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004-ref.html
new file mode 100644
index 00000000000..18cfec30692
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 20px 1fr 30%;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mixed definite, fr and %.</p>
+  <div class="grid">
+    <div style="background-color: orange;"></div>
+    <div style="background-color: yellow;"></div>
+    <div style="background-color: blue;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html
new file mode 100644
index 00000000000..ec579ac978e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-004.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-track-sizing-004-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    grid-template-columns: 20px 1fr 30%;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mixed definite, fr and %.</p>
+  <div class="masonry">
+    <div style="background-color: orange; height: 100px;"></div>
+    <div style="background-color: yellow; height: 100px;"></div>
+    <div style="background-color: blue; height: 100px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005-ref.html
new file mode 100644
index 00000000000..616640219cb
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005-ref.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-columns: 90px 80px 100px;
+    width: 290px;
+    height: 425px;
+    gap: 10px;
+    background: lightgoldenrodyellow;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mix of explicit and auto item placement.</p>
+  <div class="grid">
+    <div style="width: 50px; height: 50px; background: orange;"></div>
+    <div style="width: 30px; height: 30px; background: yellow;"></div>
+    <div style="width: 25px; height: 25px; background: green;"></div>
+
+    <div style="width: 60px; height: 60px; background: pink;"></div>
+    <div style="width: 80px; height: 80px; background: purple; transform: translateY(-20px);"></div>
+    <div style="width: 100px; height: 100px; background: blue; transform: translateY(-25px);"></div>
+
+    <div style="width: 90px; height: 90px; background: teal; transform: translateY(-40px);"></div>
+    <div style="width: 40px; height: 40px; background: lime; transform: translateY(-40px);"></div>
+    <div style="width: 15px; height: 15px; background: coral; transform: translateY(-25px);"></div>
+
+    <div style="width: 90px; height: 25px; background: green; transform: translateY(-40px);"></div>
+    <div style="width: 80px; height: 50px; background: orange; transform: translateY(-90px);"></div>
+    <div style="width: 10px; height: 10px; background: fuchsia; grid-column: 3; transform: translateY(-100px);"></div>
+
+    <div style="width: 90px; height: 60px; background: pink; grid-column: 1; transform: translateY(-65px);"></div>
+    <div style="width: 80px; height: 80px; background: purple; transform: translateY(-90px);"></div>
+    <div style="width: 100px; height: 30px; background: yellow; transform: translateY(-140px);"></div>
+
+    <div style="width: 90px; height: 90px; background: teal; grid-column: 1; transform: translateY(-85px);"></div>
+    <div style="width: 80px; height: 40px; background: lime; transform: translateY(-90px);"></div>
+    <div style="width: 100px; height: 100px; background: blue; transform: translateY(-190px);"></div>
+
+    <div style="width: 100px; height: 15px; background: coral; transform: translateY(-190px); grid-column: 3;"></div>
+    <div style="width: 100px; height: 10px; background: fuchsia; transform: translateY(-190px); grid-column: 3;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html
new file mode 100644
index 00000000000..fa20b6c3476
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/column-track-sizing-005.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="column-track-sizing-005-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    item-tolerance: 0;
+    grid-template-columns: auto auto auto;
+    width: fit-content;
+    gap: 10px;
+    background: lightgoldenrodyellow;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mix of explicit and auto item placement.</p>
+  <div class="masonry">
+    <div style="width: 50px; height: 50px; background: orange;"></div>
+    <div style="width: 30px; height: 30px; background: yellow;"></div>
+    <div style="width: 25px; height: 25px; background: green;"></div>
+    <div style="width: 100px; height: 100px; background: blue; grid-column: 3;"></div>
+    <div style="width: 80px; height: 80px; background: purple;"></div>
+    <div style="width: 60px; height: 60px; background: pink;"></div>
+    <div style="width: 40px; height: 40px; background: lime;"></div>
+    <div style="width: 90px; height: 90px; background: teal; grid-column: 1;"></div>
+    <div style="width: 15px; height: 15px; background: coral;"></div>
+    <div style="width: 10px; height: 10px; background: fuchsia;"></div>
+
+    <div style="width: 100%; height: 50px; background: orange;"></div>
+    <div style="width: 100%; height: 30px; background: yellow;"></div>
+    <div style="width: 100%; height: 25px; background: green;"></div>
+    <div style="width: 100%; height: 100px; background: blue;"></div>
+    <div style="width: 100%; height: 80px; background: purple;"></div>
+    <div style="width: 100%; height: 60px; background: pink;"></div>
+    <div style="width: 100%; height: 40px; background: lime;"></div>
+    <div style="width: 100%; height: 90px; background: teal;"></div>
+    <div style="width: 100%; height: 15px; background: coral;"></div>
+    <div style="width: 100%; height: 10px; background: fuchsia;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html
index e93a59a4a58..e3e9b6448dd 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-check-grid-height-on-resize.html
@@ -12,9 +12,7 @@
 
 <style>
   grid {
-    display: inline-grid;
     display: inline-masonry;
-    grid-template-rows: masonry;
     grid-template-columns: auto;
     grid-gap: 10px;
     border: 10px;
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html
index 341bf26e236..ab1cfd8d00f 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html
@@ -12,10 +12,8 @@
 <body>
 <style>
     grid {
-        display: grid;
         display: masonry;
         grid-template-columns: 100px 1fr;
-        grid-template-rows: masonry;
         width: 300px;
         height: 100px;
     }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html
index 418f1e43f02..86ae7984f67 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-left-side.html
@@ -12,10 +12,8 @@
 <body>
 <style>
 grid {
-  display: grid;
   display: masonry;
   grid-template-columns: auto 1fr;
-  grid-template-rows: masonry;
   width: 300px;
   height: 100px;
 }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html
index c736ff54752..e5c71d57cb4 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-overflow-right-side.html
@@ -12,10 +12,8 @@
 <body>
 <style>
 grid {
-  display: grid;
   display: masonry;
   grid-template-columns: 1fr auto;
-  grid-template-rows: masonry;
   width: 300px;
   height: 100px;
 }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html
index 527c7b0d890..b7367fdead5 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-span-row.html
@@ -12,10 +12,8 @@
 <body>
 <style>
     grid {
-        display: grid;
         display: masonry;
         grid-template-columns: 50px 1fr;
-        grid-template-rows: masonry;
         width: 300px;
         height: 100px;
     }
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001-ref.html
new file mode 100644
index 00000000000..7217cd2dbc3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001-ref.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 5% repeat(3, 10px 15%) repeat(1, 15px 5px 20px);
+    grid-template-columns: 100px 100px 100px 100px 100px;
+    height: 500px;
+    gap: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized.</p>
+  <div class="grid">
+    <div style="height: 100%; width: 50px; background: orange;"></div>
+    <div style="height: 100%; width: 60px; background: pink; transform: translateX(-50px);"></div>
+    <div style="height: 100%; width: 40px; background: lime; transform: translateX(-90px);"></div>
+
+    <div style="height: 100%; width: 30px; background: yellow; grid-column: 1;"></div>
+    <div style="height: 100%; width: 100px; background: blue; transform: translateX(-70px);"></div>
+
+    <div style="height: 100%; width: 25px; background: green; grid-column: 1;"></div>
+    <div style="height: 100%; width: 25px; background: green; transform: translateX(-75px);"></div>
+    <div style="height: 100%; width: 90px; background: teal; transform: translateX(-150px);"></div>
+
+    <div style="height: 100%; width: 100px; background: blue; grid-column: 1;"></div>
+    <div style="height: 100%; width: 80px; background: purple;"></div>
+
+    <div style="height: 100%; width: 80px; background: purple; grid-column: 1;"></div>
+    <div style="height: 100%; width: 50px; background: orange; transform: translateX(-20px);"></div>
+
+    <div style="height: 100%; width: 60px; background: pink; grid-column: 1;"></div>
+    <div style="height: 100%; width: 15px; background: coral; transform: translateX(-40px);"></div>
+    <div style="height: 100%; width: 30px; background: yellow; transform: translateX(-125px);"></div>
+    <div style="height: 100%; width: 90px; background: teal; transform: translateX(-195px);"></div>
+
+    <div style="height: 100%; width: 40px; background: lime; grid-column: 1;"></div>
+    <div style="height: 100%; width: 80px; background: purple; transform: translateX(-60px);"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia; transform: translateX(-80px);"></div>
+
+    <div style="height: 100%; width: 90px; background: teal; grid-column: 1;"></div>
+    <div style="height: 100%; width: 25px; background: green; transform: translateX(-10px);"></div>
+    <div style="height: 100%; width: 15px; background: coral; transform: translateX(-85px);"></div>
+
+    <div style="height: 100%; width: 15px; background: coral; grid-column: 1;"></div>
+    <div style="height: 100%; width: 30px; background: yellow; transform: translateX(-85px);"></div>
+    <div style="height: 100%; width: 40px; background: lime; transform: translateX(-155px);"></div>
+    <div style="height: 100%; width: 60px; background: pink; transform: translateX(-215px);"></div>
+
+    <div style="height: 100%; width: 10px; background: fuchsia; grid-column: 1;"></div>
+    <div style="height: 100%; width: 50px; background: orange; transform: translateX(-90px);"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia; transform: translateX(-140px);"></div>
+    <div style="height: 100%; width: 100px; background: blue; transform: translateX(-230px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html
new file mode 100644
index 00000000000..67df96c76a2
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-001.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-track-sizing-001-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    item-tolerance: 0;
+    grid-template-rows: 5% repeat(3, 10px 15%) repeat(1, 15px 5px 20px);
+    height: 500px;
+    gap: 10px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized.</p>
+  <div class="masonry">
+    <div style="height: 100%; width: 50px; background: orange;"></div>
+    <div style="height: 100%; width: 30px; background: yellow;"></div>
+    <div style="height: 100%; width: 25px; background: green;"></div>
+    <div style="height: 100%; width: 100px; background: blue;"></div>
+    <div style="height: 100%; width: 80px; background: purple;"></div>
+    <div style="height: 100%; width: 60px; background: pink;"></div>
+    <div style="height: 100%; width: 40px; background: lime;"></div>
+    <div style="height: 100%; width: 90px; background: teal;"></div>
+    <div style="height: 100%; width: 15px; background: coral;"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia;"></div>
+
+    <div style="height: 100%; width: 50px; background: orange;"></div>
+    <div style="height: 100%; width: 30px; background: yellow;"></div>
+    <div style="height: 100%; width: 25px; background: green;"></div>
+    <div style="height: 100%; width: 100px; background: blue;"></div>
+    <div style="height: 100%; width: 80px; background: purple;"></div>
+    <div style="height: 100%; width: 60px; background: pink;"></div>
+    <div style="height: 100%; width: 40px; background: lime;"></div>
+    <div style="height: 100%; width: 90px; background: teal;"></div>
+    <div style="height: 100%; width: 15px; background: coral;"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia;"></div>
+
+    <div style="height: 100%; width: 50px; background: orange;"></div>
+    <div style="height: 100%; width: 30px; background: yellow;"></div>
+    <div style="height: 100%; width: 25px; background: green;"></div>
+    <div style="height: 100%; width: 100px; background: blue;"></div>
+    <div style="height: 100%; width: 80px; background: purple;"></div>
+    <div style="height: 100%; width: 60px; background: pink;"></div>
+    <div style="height: 100%; width: 40px; background: lime;"></div>
+    <div style="height: 100%; width: 90px; background: teal;"></div>
+    <div style="height: 100%; width: 15px; background: coral;"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002-ref.html
new file mode 100644
index 00000000000..f4dfe5a9ca9
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: minmax(15px, min-content) max-content auto;
+    grid-template-columns: 3em 2em 1em;
+    background-color: gray;
+    height: 100px;
+    width: 100px;
+    font: 10px/1 Ahem;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and auto tracks are stretched.</p>
+  <div class="grid">
+    <div style="grid-row: 1; background: green; width: min-content;">XXX XXX</div>
+    <div style="grid-row: 1 / 3; background: purple; width: 2em;">X XX X</div>
+    <div style="grid-row: 1; height: 100%; width: 1em; background: yellow;"></div>
+    <div style="grid-row: 2; grid-column: 3; height: 100%; width: 1em; background: orange;"></div>
+    <div style="grid-row: 3; height: 100%; width: 1em; background: blue;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html
new file mode 100644
index 00000000000..e71adb8150f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-002.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="match" href="row-track-sizing-002-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: minmax(15px, min-content) max-content auto;
+    background-color: gray;
+    height: 100px;
+    width: 100px;
+    font: 10px/1 Ahem;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and auto tracks are stretched.</p>
+  <div class="masonry">
+    <div style="grid-row: 1; background: green; width: min-content;">XXX XXX</div>
+    <div style="grid-row: 1 / 3; background: purple; width: 2em;">X XX X</div>
+    <div style="grid-row: 1; height: 100%; width: 1em; background: yellow;"></div>
+    <div style="grid-row: 2; height: 100%; width: 1em; background: orange;"></div>
+    <div style="grid-row: 3; height: 100%; width: 1em; background: blue;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003-ref.html
new file mode 100644
index 00000000000..ad11acafa51
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 1fr 5fr 3fr 1fr;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and flexible tracks are expanded.</p>
+  <div class="grid">
+    <div style="background-color: orange;"></div>
+    <div style="background-color: yellow;"></div>
+    <div style="background-color: blue;"></div>
+    <div style="background-color: purple;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html
new file mode 100644
index 00000000000..ad44dc72a89
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-003.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-track-sizing-003-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: 1fr 5fr 3fr 1fr;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized, and flexible tracks are expanded.</p>
+  <div class="masonry">
+    <div style="background-color: orange; width: 100px;"></div>
+    <div style="background-color: yellow; width: 100px;"></div>
+    <div style="background-color: blue; width: 100px;"></div>
+    <div style="background-color: purple; width: 100px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004-ref.html
new file mode 100644
index 00000000000..2e00794359d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 20px 1fr 30%;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mixed definite, fr and %.</p>
+  <div class="grid">
+    <div style="background-color: orange;"></div>
+    <div style="background-color: yellow;"></div>
+    <div style="background-color: blue;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html
new file mode 100644
index 00000000000..199ce46c98d
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-004.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-track-sizing-004-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    grid-template-rows: 20px 1fr 30%;
+    width: 100px;
+    height: 100px;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mixed definite, fr and %.</p>
+  <div class="masonry">
+    <div style="background-color: orange; width: 100px;"></div>
+    <div style="background-color: yellow; width: 100px;"></div>
+    <div style="background-color: blue; width: 100px;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005-ref.html
new file mode 100644
index 00000000000..e9f011040ce
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<style>
+.grid {
+    display: grid;
+    grid-template-rows: 90px 80px 100px;
+    grid-template-columns: 50px 100px 90px 50px 80px 100px 15px 10px;
+    height: 290px;
+    gap: 10px;
+    background: lightgoldenrodyellow;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mix of explicit and auto item placement.</p>
+  <div class="grid">
+    <div style="width: 50px; height: 50px; background: orange;"></div>
+    <div style="width: 60px; height: 60px; background: pink;"></div>
+    <div style="width: 90px; height: 90px; background: teal; transform: translateX(-40px);"></div>
+    <div style="height: 100%; width: 25px; background: green; transform: translateX(-40px);"></div>
+    <div style="height: 100%; width: 60px; background: pink; transform: translateX(-65px);"></div>
+    <div style="height: 100%; width: 90px; background: teal; transform: translateX(-85px);"></div>
+
+    <div style="width: 30px; height: 30px; background: yellow; grid-row: 2;"></div>
+    <div style="width: 80px; height: 80px; background: purple; grid-row: 2; transform: translateX(-20px);"></div>
+    <div style="width: 40px; height: 40px; background: lime; grid-row: 2; transform: translateX(-40px);"></div>
+    <div style="height: 100%; width: 50px; background: orange; grid-row: 2; transform: translateX(-90px);"></div>
+    <div style="height: 100%; width: 80px; background: purple; grid-row: 2; transform: translateX(-90px);"></div>
+    <div style="height: 100%; width: 40px; background: lime; grid-row: 2; transform: translateX(-90px);"></div>
+
+    <div style="width: 25px; height: 25px; background: green; grid-row: 3;"></div>
+    <div style="width: 100px; height: 100px; background: blue; grid-row: 3; transform: translateX(-25px);"></div>
+    <div style="width: 15px; height: 15px; background: coral; grid-row: 3; transform: translateX(-25px);"></div>
+    <div style="width: 10px; height: 10px; background: fuchsia; grid-row: 3; transform: translateX(-100px);"></div>
+    <div style="height: 100%; width: 30px; background: yellow; grid-row: 3; transform: translateX(-140px);"></div>
+    <div style="height: 100%; width: 100px; background: blue; grid-row: 3; transform: translateX(-190px);"></div>
+    <div style="height: 100%; width: 15px; background: coral; grid-row: 3; transform: translateX(-190px);"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia; grid-row: 3; transform: translateX(-190px);"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html
new file mode 100644
index 00000000000..91a62294558
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/track-sizing/row-track-sizing-005.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<link rel="help" href="https://drafts.csswg.org/css-grid-3">
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="match" href="row-track-sizing-005-ref.html">
+<style>
+.masonry {
+    display: masonry;
+    masonry-direction: row;
+    item-tolerance: 0;
+    grid-template-rows: auto auto auto;
+    gap: 10px;
+    background: lightgoldenrodyellow;
+}
+</style>
+<body>
+  <p>Test that masonry tracks are correctly sized with mix of explicit and auto item placement.</p>
+  <div class="masonry">
+    <div style="width: 50px; height: 50px; background: orange;"></div>
+    <div style="width: 30px; height: 30px; background: yellow;"></div>
+    <div style="width: 25px; height: 25px; background: green;"></div>
+    <div style="width: 100px; height: 100px; background: blue; grid-row: 3;"></div>
+    <div style="width: 80px; height: 80px; background: purple;"></div>
+    <div style="width: 60px; height: 60px; background: pink;"></div>
+    <div style="width: 40px; height: 40px; background: lime;"></div>
+    <div style="width: 90px; height: 90px; background: teal; grid-row: 1;"></div>
+    <div style="width: 15px; height: 15px; background: coral;"></div>
+    <div style="width: 10px; height: 10px; background: fuchsia;"></div>
+
+    <div style="height: 100%; width: 50px; background: orange;"></div>
+    <div style="height: 100%; width: 30px; background: yellow;"></div>
+    <div style="height: 100%; width: 25px; background: green;"></div>
+    <div style="height: 100%; width: 100px; background: blue;"></div>
+    <div style="height: 100%; width: 80px; background: purple;"></div>
+    <div style="height: 100%; width: 60px; background: pink;"></div>
+    <div style="height: 100%; width: 40px; background: lime;"></div>
+    <div style="height: 100%; width: 90px; background: teal;"></div>
+    <div style="height: 100%; width: 15px; background: coral;"></div>
+    <div style="height: 100%; width: 10px; background: fuchsia;"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update-ref.html b/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update-ref.html
new file mode 100644
index 00000000000..595b27a6288
--- /dev/null
+++ b/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<div>1A</div>
+<div>2B</div>
+<div>3C</div>
+<div>4E</div>
diff --git a/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update.html b/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update.html
new file mode 100644
index 00000000000..709dae62f8b
--- /dev/null
+++ b/tests/wpt/tests/css/css-lists/deep-pseudo-element-remove-update.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>CSS Lists Test: counters updated when parent element of element with counter operation on its pseudo element is removed</title>
+<link rel="help" href="https://drafts.csswg.org/css-lists/#inheriting-counters">
+<link rel="match" href="deep-pseudo-element-remove-update-ref.html">
+<style>
+  .container {
+    counter-reset: plm-table 0;
+  }
+
+  .numbered span::after {
+    content: counter(plm-table);
+    counter-increment: plm-table;
+  }
+</style>
+<div class="container">
+  <div class="numbered a"><span></span>A</div>
+  <div class="numbered b"><span></span>B</div>
+  <div id="target" class="numbered d"><span></span>D</div>
+  <div class="numbered c"><span></span>C</div>
+  <div class="numbered e"><span></span>E</div>
+</div>
+<script>
+  document.documentElement.offsetTop;
+  target.remove();
+</script>
diff --git a/tests/wpt/tests/css/css-lists/parsing/list-style-image-computed.sub.html b/tests/wpt/tests/css/css-lists/parsing/list-style-image-computed.sub.html
index a39b0f09129..4232bbcfbf6 100644
--- a/tests/wpt/tests/css/css-lists/parsing/list-style-image-computed.sub.html
+++ b/tests/wpt/tests/css/css-lists/parsing/list-style-image-computed.sub.html
@@ -22,11 +22,16 @@ test_computed_value('list-style-image', 'none');
 test_computed_value('list-style-image', 'url("https://{{host}}/")');
 
 test_computed_value('list-style-image', 'linear-gradient(to left bottom, red , blue )', 'linear-gradient(to left bottom, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('list-style-image', 'linear-gradient(calc(90deg - 45deg), rgb(0, 128, 0), rgb(0, 0, 255)', 'linear-gradient(45deg, rgb(0, 128, 0), rgb(0, 0, 255))');
 
 test_computed_value('list-style-image', 'radial-gradient(10px at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))');
 test_computed_value('list-style-image', 'radial-gradient(circle calc(-0.5em + 10px) at calc(-1em + 10px) calc(-2em + 10px), rgb(255, 0, 0), rgb(0, 0, 255))', 'radial-gradient(0px at -30px -70px, rgb(255, 0, 0), rgb(0, 0, 255))');
 test_computed_value('list-style-image', 'radial-gradient(ellipse calc(-0.5em + 10px) calc(0.5em + 10px) at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))', 'radial-gradient(0px 30px at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))');
 test_computed_value('list-style-image', 'radial-gradient(ellipse calc(0.5em + 10px) calc(-0.5em + 10px) at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))', 'radial-gradient(30px 0px at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('list-style-image', 'radial-gradient(black 0% 0.5em, 25%, green 30% 60%, calc(100% * 3 / 4), white calc(100% - 20%) 100%', 'radial-gradient(rgb(0, 0, 0) 0%, rgb(0, 0, 0) 20px, 25%, rgb(0, 128, 0) 30%, rgb(0, 128, 0) 60%, 75%, rgb(255, 255, 255) 80%, rgb(255, 255, 255) 100%)');
+
+test_computed_value('list-style-image', 'conic-gradient(gold calc(100% / 2), #f06 calc(360deg * 4 / 5))', 'conic-gradient(rgb(255, 215, 0) 50%, rgb(255, 0, 102) 288deg)');
+test_computed_value('list-style-image', 'conic-gradient(black 1turn, white', 'conic-gradient(rgb(0, 0, 0) 360deg, rgb(255, 255, 255))');
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-computed.html b/tests/wpt/tests/css/css-masking/parsing/mask-computed.html
index 586683dd5de..4f825cf3946 100644
--- a/tests/wpt/tests/css/css-masking/parsing/mask-computed.html
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-computed.html
@@ -30,6 +30,21 @@ test_computed_value('mask',
 test_computed_value('mask',
     'linear-gradient(to left bottom, red, blue) luminance',
     'linear-gradient(to left bottom, rgb(255, 0, 0), rgb(0, 0, 255)) luminance');
+test_computed_value('mask',
+   'linear-gradient(calc(90deg - 45deg), rgb(0, 128, 0), rgb(0, 0, 255)',
+   'linear-gradient(45deg, rgb(0, 128, 0), rgb(0, 0, 255))');
+test_computed_value('mask',
+   'radial-gradient(circle calc(-0.5em + 10px) at calc(-1em + 10px) calc(-2em + 10px), rgb(255, 0, 0), rgb(0, 0, 255))',
+   'radial-gradient(2px at -6px -22px, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('mask',
+   'radial-gradient(ellipse calc(-0.5em + 10px) calc(0.5em + 10px) at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))',
+   'radial-gradient(2px 18px at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('mask',
+   'conic-gradient(gold calc(100% / 2), #f06 calc(360deg * 4 / 5))',
+   'conic-gradient(rgb(255, 215, 0) 50%, rgb(255, 0, 102) 288deg)');
+test_computed_value('mask',
+   'conic-gradient(black 1turn, white',
+   'conic-gradient(rgb(0, 0, 0) 360deg, rgb(255, 255, 255))');
 test_computed_value('mask', 'url("https://example.com/")');
 
 // <position> [ / <bg-size> ]?
diff --git a/tests/wpt/tests/css/css-multicol/column-height-009-ref.html b/tests/wpt/tests/css/css-multicol/column-height-009-ref.html
index 4696d79695b..18d5aaa1b51 100644
--- a/tests/wpt/tests/css/css-multicol/column-height-009-ref.html
+++ b/tests/wpt/tests/css/css-multicol/column-height-009-ref.html
@@ -26,13 +26,16 @@
     <div class="item">g<br>h</div>
     <div class="item">m<br>n</div>
   </div>
-  <div class="rule" style="height:160px;"></div>
+  <div class="rule" style="height:40px;"></div>
+  <div class="rule" style="position: absolute; top: 68px; left: 108px; height:40px;"></div>
+  <div class="rule" style="position: absolute; top: 128px; left: 108px; height:40px;"></div>
   <div class="column">
     <div class="item">c<br>d</div>
     <div class="item">i<br>j</div>
     <div class="item">o<br>p</div>
   </div>
-  <div class="rule" style="height:160px;"></div>
+  <div class="rule" style="height:40px;"></div>
+  <div class="rule" style="position: absolute; top: 68px; left: 228px; height:40px;"></div>
   <div class="column">
     <div class="item">e<br>f</div>
     <div class="item">k<br>l</div>
diff --git a/tests/wpt/tests/css/css-nesting/nesting-basic.html b/tests/wpt/tests/css/css-nesting/nesting-basic.html
index 9edff4ea1af..7e1734902d2 100644
--- a/tests/wpt/tests/css/css-nesting/nesting-basic.html
+++ b/tests/wpt/tests/css/css-nesting/nesting-basic.html
@@ -88,6 +88,17 @@
     background-color: red !important;
   }
 
+  .test-13::before {
+    background-color: green;
+    color: green;
+    content: "text";
+  }
+  .test-13::before {
+    & {
+      background-color: red;
+    }
+  }
+
   body * + * {
     margin-top: 8px;
   }
@@ -109,4 +120,5 @@
   <div class="test test-10"><div></div></div>
   <div class="test test-11"><div></div></div>
   <div class="test test-12"></div>
+  <div class="test test-13"></div>
 </body>
diff --git a/tests/wpt/tests/css/css-overflow/column-scroll-marker-002-ref.html b/tests/wpt/tests/css/css-overflow/column-scroll-marker-002-ref.html
index a9630037e16..3f1819cb72b 100644
--- a/tests/wpt/tests/css/css-overflow/column-scroll-marker-002-ref.html
+++ b/tests/wpt/tests/css/css-overflow/column-scroll-marker-002-ref.html
@@ -35,4 +35,6 @@
     <div class="fakecolumn">Fourth column</div>
   </div>
 </div>
+<script>
 
+</script>
diff --git a/tests/wpt/tests/css/css-overflow/column-scroll-marker-002.html b/tests/wpt/tests/css/css-overflow/column-scroll-marker-002.html
index 5b93d6813c1..e8ce6daa6df 100644
--- a/tests/wpt/tests/css/css-overflow/column-scroll-marker-002.html
+++ b/tests/wpt/tests/css/css-overflow/column-scroll-marker-002.html
@@ -26,6 +26,9 @@
       height: 50px;
       background: cyan;
     }
+    #container::column {
+      scroll-snap-align: center;
+    }
     #container::column::scroll-marker {
       display: flex;
       justify-content: center;
@@ -64,7 +67,7 @@
   <script>
     async function run() {
       actions_promise = new test_driver.Actions()
-        .pointerMove(310, 10)
+        .pointerMove(210, 10)
         .pointerDown()
         .pointerUp()
         .send();
diff --git a/tests/wpt/tests/css/css-overflow/column-scroll-marker-003.html b/tests/wpt/tests/css/css-overflow/column-scroll-marker-003.html
index 05105632044..391186f4585 100644
--- a/tests/wpt/tests/css/css-overflow/column-scroll-marker-003.html
+++ b/tests/wpt/tests/css/css-overflow/column-scroll-marker-003.html
@@ -72,15 +72,15 @@
 
   promise_test(async t => {
     await sendClick(110);
-    assert_equals(container.scrollLeft, 0);
+    assert_equals(container.scrollLeft, 140);
   }, "Scroll second column into view");
   promise_test(async t => {
     await sendClick(210);
-    assert_equals(container.scrollLeft, 0);
+    assert_equals(container.scrollLeft, 280);
   }, "Scroll third column into view");
   promise_test(async t => {
     await sendClick(310);
-    assert_equals(container.scrollLeft, 140);
+    assert_equals(container.scrollLeft, 280);
   }, "Scroll fourth column into view");
   promise_test(async t => {
     await sendClick(410);
diff --git a/tests/wpt/tests/css/css-overflow/column-scroll-marker-005.html b/tests/wpt/tests/css/css-overflow/column-scroll-marker-005.html
index 1e87758f7de..ab33fb57c64 100644
--- a/tests/wpt/tests/css/css-overflow/column-scroll-marker-005.html
+++ b/tests/wpt/tests/css/css-overflow/column-scroll-marker-005.html
@@ -52,15 +52,15 @@
   }
   promise_test(async t => {
     await sendClick(110);
-    assert_equals(container.scrollLeft, 0);
+    assert_equals(container.scrollLeft, 140);
   }, "Scroll second column into view");
   promise_test(async t => {
     await sendClick(210);
-    assert_equals(container.scrollLeft, 0);
+    assert_equals(container.scrollLeft, 280);
   }, "Scroll third column into view");
   promise_test(async t => {
     await sendClick(310);
-    assert_equals(container.scrollLeft, 140);
+    assert_equals(container.scrollLeft, 280);
   }, "Scroll fourth column into view");
   promise_test(async t => {
     await sendClick(410);
diff --git a/tests/wpt/tests/css/css-overflow/column-scroll-marker-010.html b/tests/wpt/tests/css/css-overflow/column-scroll-marker-010.html
index c40a87c54b6..9dbe697f191 100644
--- a/tests/wpt/tests/css/css-overflow/column-scroll-marker-010.html
+++ b/tests/wpt/tests/css/css-overflow/column-scroll-marker-010.html
@@ -85,17 +85,17 @@
   }, "Initial scroll position");
   promise_test(async t => {
     await sendClick(110);
-    assert_equals(scrollable.scrollLeft, 0);
+    assert_equals(scrollable.scrollLeft, 240);
     assert_equals(scrollable.scrollTop, 50);
   }, "Scroll second column into view");
   promise_test(async t => {
     await sendClick(210);
-    assert_equals(scrollable.scrollLeft, 100);
+    assert_equals(scrollable.scrollLeft, 380);
     assert_equals(scrollable.scrollTop, 50);
   }, "Scroll third column into view");
   promise_test(async t => {
     await sendClick(310);
-    assert_equals(scrollable.scrollLeft, 240);
+    assert_equals(scrollable.scrollLeft, 380);
     assert_equals(scrollable.scrollTop, 50);
   }, "Scroll fourth column into view");
   promise_test(async t => {
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/block-ellipsis-028.html b/tests/wpt/tests/css/css-overflow/line-clamp/block-ellipsis-028.html
index c2bc63651df..3ff54c18d1c 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/block-ellipsis-028.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/block-ellipsis-028.html
@@ -4,7 +4,8 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#block-ellipsis">
-<link rel="match" href="reference/block-ellipsis-028-ref.html">
+<link rel="match" href="reference/block-ellipsis-028-ref-a.html">
+<link rel="match" href="reference/block-ellipsis-028-ref-b.html">
 <meta name="assert" content="Soft hyphens create opportunities for placement of the block-ellipsis">
 <style>
 .clamp {
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-039.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-039.html
new file mode 100644
index 00000000000..601a11510ec
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-039.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Overflow: `line-clamp: auto` empty div</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
+<link rel="match" href="reference/line-clamp-auto-039-ref.html">
+<meta name="assert" content="Checks that the clamp point is after, rather than before, an empty div, and that this results in no ellipsis being inserted as the last thing before the clamp point isn't a line">
+<style>
+.clamp {
+  line-clamp: auto;
+  max-height: 4lh;
+  background-color: yellow;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4<br>
+<div></div>
+Line 5
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-040.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-040.html
new file mode 100644
index 00000000000..ee666bd662a
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-040.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Overflow: `line-clamp: auto` zero-height div</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
+<link rel="match" href="reference/line-clamp-auto-040-ref.html">
+<meta name="assert" content="Checks that the clamp point is after, rather than before, an non-empty div with zero-height, and that this results in the content of that div being retained and ellipsis being inserted on its the last line">
+<style>
+.clamp {
+  line-clamp: auto;
+  max-height: 4lh;
+  background-color: yellow;
+}
+.zero {
+  height: 0;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4<br>
+<div class=zero>
+Line 5<br>
+Line 6
+</div>
+Line 7
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-001.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-001.html
index fd261493f06..52143733b7a 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-001.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-001.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-002.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-002.html
index 233a345c927..151ba4bfa6d 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-002.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-002.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-003.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-003.html
index 8b5d681d97c..182d91cc537 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-003.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-003.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-004.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-004.html
index c079974ac5c..53937a41ab0 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-004.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-004.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the initial containing block, so the abspos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-005.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-005.html
index 58656135cf0..bae4582e842 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-005.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-005.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-006.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-006.html
index 39f1758fa18..1bd151a003d 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-006.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-006.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-007.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-007.html
index f5b4e6ce291..dc1cd873deb 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-007.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-007.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-008.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-008.html
index cd619d51538..5f5c1bafee1 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-008.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-008.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the abspos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-009.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-009.html
index b3d332811d6..9c1ce85af23 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-009.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-009.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-009-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the abspos gets painted.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the abspos gets painted.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-010.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-010.html
index 8a7c2790d6c..803aefc2c66 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-010.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-010.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-009-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the abspos gets painted.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the abspos gets painted.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-011.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-011.html
index cb4ab051480..f61d9862b92 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-011.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-011.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-012.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-012.html
index ae2f0364f39..0c66edb5283 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-012.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-012.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-013.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-013.html
index 66a615ddd1c..bf227c7eff6 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-013.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-013.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-013-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-014.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-014.html
index e8257d1d402..bd62ad787f3 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-014.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-014.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-013-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted, even if its static position is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-015.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-015.html
index 273610e071d..3f9a99e3722 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-015.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-015.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-005-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden. This happens even when the containing block is an inline.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the abspos is hidden. This happens even when the containing block is an inline.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-016.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-016.html
index 0b329a7d734..4c4f2cf1cf4 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-016.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-016.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-016-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted. This happens even when the containing block is an inline, and even when the static position of the abspos is after the clamp point.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the abspos gets painted. This happens even when the containing block is an inline, and even when the static position of the abspos is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html
similarity index 76%
rename from tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html
index 8ae9cc949c6..63377faced8 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.tentative.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-017.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-030-ref.html">
-<meta name="assert" content="Absolute positioned boxes in a line-clamp container are hidden if and only if their containing block precedes or contains the clamp point. In this case, the containing block is an inline whose start gets displaced by the ellipsis. Therefore, it counts as being all after the clamp point, and the abspos is hidden.">
+<meta name="assert" content="Absolute positioned boxes in a line-clamp container are shown if and only if their containing block precedes or contains the clamp point. In this case, the containing block is an inline whose start gets displaced by the ellipsis. Therefore, it counts as being all after the clamp point, and the abspos is hidden.">
 <style>
 .clamp {
   line-clamp: 3;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html
new file mode 100644
index 00000000000..c2096e15a28
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-abspos-023.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow: abspos in line-clamp in zero-sized div</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
+<link rel="match" href="reference/line-clamp-with-abspos-023-ref.html">
+<meta name="assert" content="Absolute positioned boxes inside a line-clamp container are shown if their containing block is after the clamp point. This test specifically tests that this is the case where the container is an other-wise empty, zero-height div, which does fit before the clamp point.">
+<style>
+.clamp {
+  line-clamp: auto;
+  max-height: 4lh;
+  font: 16px / 32px serif;
+  background-color: yellow;
+}
+.rel {
+  position: relative;
+}
+.abspos {
+  position: absolute;
+  right: 0;
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4<br>
+<div class="rel"><div class="abspos">This abspos should be visible</div></div>
+Line 5
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-001.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-001.html
index 7f69c970baa..36790cde205 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-001.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-001.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-002.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-002.html
index 90eecbd6af6..f5cc1545fcc 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-002.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-002.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-003.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-003.html
index c4bc8a64784..ce82773af54 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-003.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-003.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-004.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-004.html
index 673b7d8c9d8..b6b3559c44e 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-004.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-004.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-001-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the layout viewport, so the fixed-pos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-005.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-005.html
index 22cf7e0c132..6a93e282144 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-005.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-005.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-006.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-006.html
index 46f2e0b2b39..2ef2049ac95 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-006.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-006.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-007.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-007.html
index 0197ecb6d4a..1b3ec86e691 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-007.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-007.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-008.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-008.html
index b14856a417f..09183826a0b 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-008.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-008.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is the line-clamp container, so the fixed-pos gets shown, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-009.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-009.html
index 93faeed3bb1..ed505eb20ca 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-009.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-009.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-009-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the fixed-pos gets painted.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the fixed-pos gets painted.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-010.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-010.html
index 8bd64fee615..dc2d5b16013 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-010.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-010.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-009-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the fixed-pos gets painted.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully before the clamp point, so the fixed-pos gets painted.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-011.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-011.html
index 70273b36cda..9819cee527a 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-011.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-011.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the fixed-pos is hidden.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the fixed-pos is hidden.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-012.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-012.html
index 0e5584db10b..7fe259f21c1 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-012.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-012.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-005-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the fixed-pos is hidden.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block is fully after the clamp point, so the fixed-pos is hidden.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-013.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-013.html
index 580619be41e..2a4d9fbee08 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-013.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-013.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-013-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the fixed-pos gets painted, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the fixed-pos gets painted, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-014.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-014.html
index 371fb595702..8448d93d471 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-014.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-with-fixed-pos-014.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#line-clamp">
 <link rel="match" href="reference/line-clamp-with-abspos-013-ref.html">
-<meta name="assert" content="Fixed positioned boxes in a line-clamp container are hidden if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the fixed-pos gets painted, even if its static position is after the clamp point.">
+<meta name="assert" content="Fixed positioned boxes in a line-clamp container are shown if and only if their fixed positioning containing block precedes or contains the clamp point. In this case, the containing block contains the clamp point, so the fixed-pos gets painted, even if its static position is after the clamp point.">
 <style>
 .clamp {
   line-clamp: 4;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref.html b/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-a.html
similarity index 96%
rename from tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-a.html
index 43ed12e887c..7088130b22b 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-a.html
@@ -5,7 +5,6 @@
 <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
 <style>
 .clamp {
-  line-clamp: 2;
   width: 63.1ch;
   border: 1px solid black;
   font-family: monospace;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-b.html b/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-b.html
new file mode 100644
index 00000000000..a04765f6849
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/reference/block-ellipsis-028-ref-b.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow: test reference</title>
+<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<style>
+.clamp {
+  width: 63.1ch;
+  border: 1px solid black;
+  font-family: monospace;
+}
+</style>
+<div class="clamp">This time, Mark, who had always been the center of attention in
+any social gathering, walked into the room uncharacteristi-…
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-039-ref.html b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-039-ref.html
new file mode 100644
index 00000000000..e7d0f91391e
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-039-ref.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Overflow: test ref</title>
+<style>
+.clamp {
+  background-color: yellow;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-040-ref.html b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-040-ref.html
new file mode 100644
index 00000000000..c4ea515956e
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-auto-040-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>CSS Overflow: test reference</title>
+<style>
+.clamp {
+  background-color: yellow;
+}
+.zero {
+  height: 0;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4<br>
+<div class=zero>
+Line 5<br>
+Line 6…
+</div>
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-with-abspos-023-ref.html b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-with-abspos-023-ref.html
new file mode 100644
index 00000000000..93dd8af179d
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/reference/line-clamp-with-abspos-023-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow: test reference</title>
+<style>
+.clamp {
+  font: 16px / 32px serif;
+  background-color: yellow;
+}
+.rel {
+  position: relative;
+}
+.abspos {
+  position: absolute;
+  right: 0;
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+<div class="clamp">
+Line 1<br>
+Line 2<br>
+Line 3<br>
+Line 4<br>
+<div class="rel"><div class="abspos">This abspos should be visible</div></div>
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-007.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-007.html
index 95c2db51653..14c58652ebe 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-007.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-007.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-007-ref.html">
-<meta name="assert" content="-webkit-line-clamp should apply to a flex item in a -webkit-box or -webkit-inline-box flex container.">
+<meta name="assert" content="When -webkit-line-clamp applies to a -webkit-box or -webkit-inline-box flex container, it becomes flow-root, there's no flexing, and clamping applies normally to an inflow child.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-008.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-008.html
index 471333e666f..190623a47bb 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-008.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-008.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-008-ref.html">
-<meta name="assert" content="-webkit-line-clamp should apply to all flex items in a -webkit-box or -webkit-inline-box flex container independently.">
+<meta name="assert" content="When -webkit-line-clamp applies to a -webkit-box or -webkit-inline-box flex container, it becomes flow-root, there's no flexing, and clamping applies normally to the inflow children within the same FC. Lines in IFC are skipped.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-009.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-009.html
index 240f6b113b0..a0b95197dc9 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-009.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-009.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-009-ref.html">
-<meta name="assert" content="-webkit-line-clamp should count lines in non-BFC block children of the flex items.">
+<meta name="assert" content="-webkit-line-clamp should count lines in non-BFC block descendents.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-010.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-010.html
index 9ff23a2fe39..e6370f2bb36 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-010.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-010.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-010-ref.html">
-<meta name="assert" content="-webkit-line-clamp should count lines in non-BFC block children of the flex items.">
+<meta name="assert" content="-webkit-line-clamp should count lines in non-BFC block descendents.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-011.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-011.html
index 3a0016e9dfd..215f198e8c0 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-011.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-011.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-011-ref.html">
-<meta name="assert" content="-webkit-line-clamp should skip lines in BFC children of the flex items.">
+<meta name="assert" content="-webkit-line-clamp should skip lines in BFC descendents.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-012.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-012.html
index d46a7944faf..5451942eba4 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-012.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-012.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-012-ref.html">
-<meta name="assert" content="-webkit-line-clamp should skip lines in independent formatting contexts in the flex items.">
+<meta name="assert" content="-webkit-line-clamp should skip lines in independent formatting contexts.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-013.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-013.html
index 6db53906acd..e676a42d807 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-013.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-013.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-013-ref.html">
-<meta name="assert" content="-webkit-line-clamp should skip lines in independent formatting contexts in the flex items.">
+<meta name="assert" content="-webkit-line-clamp should skip lines in independent formatting contexts.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-016.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-016.html
index 5b2d4593aef..3f390ec76a3 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-016.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-016.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-016-ref.html">
-<meta name="assert" content="-webkit-line-clamp value on the flex child should be ignored.">
+<meta name="assert" content="-webkit-line-clamp value on the child of the clamping context should be ignored (since it doesn't carry -webkit-box nor webkit-box-orient:vertical itself.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-029.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-029.html
index fc395d313ea..d8fb8464db4 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-029.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-029.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-029-ref.html">
-<meta name="assert" content="-webkit-line-clamp should apply to flex items that are scrollable.">
+<meta name="assert" content="-webkit-line-clamp should not count lines in descendents that are scrollable, since they establish a new BFC.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-030.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-030.html
index 5e14a78a583..6137617e680 100644
--- a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-030.html
+++ b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-030.html
@@ -4,7 +4,7 @@
 <link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
 <link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
 <link rel="match" href="reference/webkit-line-clamp-030-ref.html">
-<meta name="assert" content="-webkit-line-clamp should apply to flex items when the container is scrollable.">
+<meta name="assert" content="-webkit-line-clamp should apply when the container is scrollable.">
 <style>
 .clamp {
   display: -webkit-box;
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.tentative.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.html
similarity index 100%
rename from tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.tentative.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-line-height.html
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.tentative.html b/tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.html
similarity index 100%
rename from tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.tentative.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/webkit-line-clamp-with-max-height.html
diff --git a/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001-ref.html b/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001-ref.html
new file mode 100644
index 00000000000..dd26f7eff8a
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001-ref.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Reference Case</title>
+<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+<!-- Note: This reference case should have almost identical markup to the
+     testcase; the only difference should be the removal of the 'clip-{x,y}'
+     classes and their 'overflow-{x,y}: clip' styles. -->
+<style>
+body { margin-left: 50px; }
+body { margin-left: 50px; }
+.outer {
+    width: 50px;
+    height: 50px;
+    border: 4px solid grey;
+    display: inline-block;
+    margin: 30px;
+}
+.shift-left {
+    transform: translatex(-10px);
+}
+.shift-right {
+    transform: translatex(10px);
+}
+.shift-up {
+    transform: translatey(-10px);
+}
+.shift-down {
+    transform: translatey(10px);
+}
+.child {
+    width: 100%;
+    height: 100%;
+    box-sizing: border-box;
+    border: 4px solid blue;
+}
+.wide {
+    width: 90px;
+    margin-left: -20px;
+}
+.tall {
+    height: 90px;
+    margin-top: -20px;
+}
+</style>
+<body>
+  <div class="outer shift-left">
+    <div class="child wide"></div>
+  </div>
+  <div class="outer">
+    <div class="child wide"></div>
+  </div>
+  <div class="outer shift-right">
+    <div class="child wide"></div>
+  </div>
+  <br>
+
+  <div class="outer shift-up">
+    <div class="child tall"></div>
+  </div>
+  <div class="outer">
+    <div class="child tall"></div>
+  </div>
+  <div class="outer shift-down">
+    <div class="child tall"></div>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001.html b/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001.html
new file mode 100644
index 00000000000..423ae63ccfa
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/overflow-clip-transform-001.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow Test: "overflow-x/y:clip" should not cause clipping in other axis, regardless of whether a transform is applied</title>
+<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#valdef-overflow-clip">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1990292">
+<link rel="match" href="overflow-clip-transform-001-ref.html">
+<style>
+body { margin-left: 50px; }
+body { margin-left: 50px; }
+.outer {
+    width: 50px;
+    height: 50px;
+    border: 4px solid grey;
+    display: inline-block;
+    margin: 30px;
+}
+.clip-x {
+    overflow-x: clip;
+}
+.clip-y {
+    overflow-y: clip;
+}
+.shift-left {
+    transform: translatex(-10px);
+}
+.shift-right {
+    transform: translatex(10px);
+}
+.shift-up {
+    transform: translatey(-10px);
+}
+.shift-down {
+    transform: translatey(10px);
+}
+.child {
+    width: 100%;
+    height: 100%;
+    box-sizing: border-box;
+    border: 4px solid blue;
+}
+.wide {
+    width: 90px;
+    margin-left: -20px;
+}
+.tall {
+    height: 90px;
+    margin-top: -20px;
+}
+</style>
+<body>
+  <!-- These elements have 'overflow-y: clip', but their only overflow is
+       in the horizontal axis, so there shouldn't be any clipping: -->
+  <div class="outer clip-y shift-left">
+    <div class="child wide"></div>
+  </div>
+  <div class="outer clip-y">
+    <div class="child wide"></div>
+  </div>
+  <div class="outer clip-y shift-right">
+    <div class="child wide"></div>
+  </div>
+  <br>
+
+  <!-- These elements have 'overflow-x: clip', but their only overflow is
+       in the vertical axis, so there shouldn't be any clipping: -->
+  <div class="outer clip-x shift-up">
+    <div class="child tall"></div>
+  </div>
+  <div class="outer clip-x">
+    <div class="child tall"></div>
+  </div>
+  <div class="outer clip-x shift-down">
+    <div class="child tall"></div>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/css-overflow/root-scroll-marker-activation-and-scroll-tracking.html b/tests/wpt/tests/css/css-overflow/root-scroll-marker-activation-and-scroll-tracking.html
index 524e5399022..76d11676375 100644
--- a/tests/wpt/tests/css/css-overflow/root-scroll-marker-activation-and-scroll-tracking.html
+++ b/tests/wpt/tests/css/css-overflow/root-scroll-marker-activation-and-scroll-tracking.html
@@ -58,14 +58,15 @@
 <div id="target"></div>
 <script>
   promise_test(async t => {
+    // Click on the fourth scroll marker.
     await new test_driver.Actions()
-    .pointerMove(65, 20)
-    .pointerDown()
-    .pointerUp()
-    .pointerDown()
-    .pointerUp()
-    .send();
-    assert_equals(window.scrollY, 380);
+      .pointerMove(65, 20)
+      .pointerDown()
+      .pointerUp()
+      .pointerDown()
+      .pointerUp()
+      .send();
+    assert_equals(window.scrollY, 400);
     assert_equals(getComputedStyle(target, "::scroll-marker").backgroundColor, "rgb(0, 128, 0)");
   });
 </script>
diff --git a/tests/wpt/tests/css/css-overflow/scroll-marker-activation-default-direction-position.html b/tests/wpt/tests/css/css-overflow/scroll-marker-activation-default-direction-position.html
new file mode 100644
index 00000000000..76934b32695
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scroll-marker-activation-default-direction-position.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow Test: ::scroll-marker activation scrolls into view with `start` as default direction position</title>
+<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-activation">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<style>
+  .toc {
+    overflow: auto;
+    overscroll-behavior: contain;
+    height: 50vh;
+    scroll-marker-group: before links;
+    counter-reset: --section;
+    padding-left: 200px;
+
+    &::scroll-marker-group {
+      position: absolute;
+      width: 200px;
+    }
+
+    & h3 {
+      counter-increment: --section;
+
+      &::scroll-marker {
+        font-size: 1rem;
+        display: block;
+        content: counter(--section) ". " attr(data-label);
+      }
+
+      &::scroll-marker:target-current {
+        color: ActiveText;
+      }
+    }
+  }
+</style>
+<div id="scroller" class="toc">
+  <h3 data-label="Introduction">Introduction</h3>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+
+  <h3 data-label="Focus">Focus Behavior</h3>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+
+  <h3 data-label="Roles">Roles</h3>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+  <p>Lorem ipsum</p>
+</div>
+<script>
+  promise_test(async t => {
+    const secondScrollMarkerX = 34;
+    const secondScrollMarkerY = 37;
+    actions_promise = new test_driver.Actions()
+      .pointerMove(secondScrollMarkerX, secondScrollMarkerY)
+      .pointerDown()
+      .pointerUp()
+      .send();
+    await actions_promise;
+    assert_not_equals(scroller.scrollTop, 0, "scroll marker activation should scroll into view with `start` as direction position");
+  });
+</script>
diff --git a/tests/wpt/tests/css/css-overflow/scroll-marker-activation-specified-direction-position.html b/tests/wpt/tests/css/css-overflow/scroll-marker-activation-specified-direction-position.html
new file mode 100644
index 00000000000..3e4c5be9ba1
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scroll-marker-activation-specified-direction-position.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Overflow Test: ::scroll-marker activation scrolls into view with doesn't override specified direction position with `start`</title>
+<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-activation">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<style>
+  .toc {
+    overflow: auto;
+    overscroll-behavior: contain;
+    height: 150px;
+    scroll-marker-group: before links;
+    counter-reset: --section;
+    padding-left: 200px;
+
+    &::scroll-marker-group {
+      position: absolute;
+      width: 200px;
+    }
+
+    & div {
+      counter-increment: --section;
+      scroll-snap-align: end;
+
+      &::scroll-marker {
+        font-size: 1rem;
+        display: block;
+        content: counter(--section) ". " attr(data-label);
+      }
+
+      &::scroll-marker:target-current {
+        color: ActiveText;
+      }
+    }
+  }
+</style>
+<div id="scroller" class="toc">
+  <div data-label="Introduction">
+    <h3>Introduction</h3>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+  </div>
+
+  <div id="target" data-label="Focus">
+    <h3>Focus Behavior</h3>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+  </div>
+
+  <div data-label="Roles">
+    <h3>Roles</h3>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+    <p>Lorem ipsum</p>
+  </div>
+</div>
+<script>
+  promise_test(async t => {
+    const secondScrollMarkerX = 34;
+    const secondScrollMarkerY = 37;
+    await new test_driver.Actions()
+      .pointerMove(secondScrollMarkerX, secondScrollMarkerY)
+      .pointerDown()
+      .pointerUp()
+      .send();
+    const scrollMarkerActivationScrollTop = scroller.scrollTop;
+    scroller.scrollTop = 0; // reset scrollTop to 0
+    target.scrollIntoView({block: "end"});
+    assert_equals(scrollMarkerActivationScrollTop, scroller.scrollTop, "scroll marker activation shouldn scroll into view with specified direction position `end` and not default `start`");
+  });
+</script>
diff --git a/tests/wpt/tests/css/css-overflow/scroll-marker-group-014.html b/tests/wpt/tests/css/css-overflow/scroll-marker-group-014.html
index 0a18c171220..73fa561ebbd 100644
--- a/tests/wpt/tests/css/css-overflow/scroll-marker-group-014.html
+++ b/tests/wpt/tests/css/css-overflow/scroll-marker-group-014.html
@@ -44,7 +44,8 @@
 <script>
   promise_test(async t => {
     assert_equals(scroller.scrollLeft, 0);
+    // Click on the third scroll marker.
     await new test_driver.Actions().pointerMove(60, 10).pointerDown().pointerUp().send();
-    assert_equals(scroller.scrollLeft, 200);
+    assert_equals(scroller.scrollLeft, 400);
   }, "Click on third scroll marker");
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/css/css-pseudo/marker-text-emphasis-ref.html b/tests/wpt/tests/css/css-pseudo/marker-text-emphasis-ref.html
index aad3614c693..65dbed89480 100644
--- a/tests/wpt/tests/css/css-pseudo/marker-text-emphasis-ref.html
+++ b/tests/wpt/tests/css/css-pseudo/marker-text-emphasis-ref.html
@@ -8,6 +8,7 @@ ol {
   float: left;
   width: 50px;
   list-style: none;
+  line-height: 2;
 }
 .text-emphasis-shorthand {
   -webkit-text-emphasis: circle green;
diff --git a/tests/wpt/tests/css/css-pseudo/marker-text-emphasis.html b/tests/wpt/tests/css/css-pseudo/marker-text-emphasis.html
index db9fb3d5257..4cbc332d7ac 100644
--- a/tests/wpt/tests/css/css-pseudo/marker-text-emphasis.html
+++ b/tests/wpt/tests/css/css-pseudo/marker-text-emphasis.html
@@ -11,6 +11,7 @@ ol {
   float: left;
   width: 50px;
   list-style-position: inside;
+  line-height: 2;
 }
 .text-emphasis-shorthand.explicit ::marker,
 .text-emphasis-shorthand.inherit {
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/values/shape-outside-gradient-computed.html b/tests/wpt/tests/css/css-shapes/shape-outside/values/shape-outside-gradient-computed.html
new file mode 100644
index 00000000000..f06afa142b3
--- /dev/null
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/values/shape-outside-gradient-computed.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Lists: getComputedStyle().listStyleImage</title>
+<link rel="help" href="https://drafts.csswg.org/css-shapes/#shape-outside-property">
+<meta name="assert" content="list-style-image computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+  #target {
+    font-size: 40px;
+  }
+</style>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value('shape-outside', 'linear-gradient(45deg, red calc(25% + 10px), blue 80%)', 'linear-gradient(45deg, rgb(255, 0, 0) calc(25% + 10px), rgb(0, 0, 255) 80%)');
+test_computed_value('shape-outside', 'linear-gradient(calc(90deg - 45deg), rgb(0, 128, 0), rgb(0, 0, 255)', 'linear-gradient(45deg, rgb(0, 128, 0), rgb(0, 0, 255))');
+
+test_computed_value('shape-outside', 'radial-gradient(circle at calc(10px + 5%), red, blue)', 'radial-gradient(circle at calc(5% + 10px) 50%, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('shape-outside', 'radial-gradient(ellipse calc(-0.5em + 10px) calc(0.5em + 10px) at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))', 'radial-gradient(0px 30px at 20px 30px, rgb(255, 0, 0), rgb(0, 0, 255))');
+test_computed_value('shape-outside', 'radial-gradient(black 0% 0.5em, 25%, green 30% 60%, calc(100% * 3 / 4), white calc(100% - 20%) 100%', 'radial-gradient(rgb(0, 0, 0) 0%, rgb(0, 0, 0) 20px, 25%, rgb(0, 128, 0) 30%, rgb(0, 128, 0) 60%, 75%, rgb(255, 255, 255) 80%, rgb(255, 255, 255) 100%)');
+
+test_computed_value('shape-outside', 'conic-gradient(from 0.5turn at 20% 30%, red, blue calc(50% - 25%))', 'conic-gradient(from 180deg at 20% 30%, rgb(255, 0, 0), rgb(0, 0, 255) 25%)');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-ui/caret-eol-001.html b/tests/wpt/tests/css/css-ui/caret-eol-001.html
index 3eb1d8ce368..46c1510dee3 100644
--- a/tests/wpt/tests/css/css-ui/caret-eol-001.html
+++ b/tests/wpt/tests/css/css-ui/caret-eol-001.html
@@ -4,7 +4,7 @@
 <title>CSS Basic User Interface Test: end-of-line carets should be visible</title>
 <link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net">
 <link rel="help" href="http://www.w3.org/TR/css4-ui/#caret-shape">
-<link rel=match href=reference/caret-eol-001.html>
+<link rel="mismatch" href=reference/caret-eol-001.html>
 <meta name="assert" content="Checks that carets positioned at the end of the line are shown even if they overflow.">
 <style>
 div {
diff --git a/tests/wpt/tests/css/css-ui/caret-eol-002.html b/tests/wpt/tests/css/css-ui/caret-eol-002.html
index 2506c6defd1..e7ba4e964dc 100644
--- a/tests/wpt/tests/css/css-ui/caret-eol-002.html
+++ b/tests/wpt/tests/css/css-ui/caret-eol-002.html
@@ -4,7 +4,7 @@
 <title>CSS Basic User Interface Test: end-of-line carets should be visible</title>
 <link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net">
 <link rel="help" href="http://www.w3.org/TR/css4-ui/#caret-shape">
-<link rel=match href=reference/caret-eol-001.html>
+<link rel="mismatch" href=reference/caret-eol-001.html>
 <meta name="assert" content="Checks that carets positioned at the end of the line are shown even if they overflow, even if the box has hidden overflow.">
 <style>
 div {
diff --git a/tests/wpt/tests/css/css-ui/caret-eol-003.html b/tests/wpt/tests/css/css-ui/caret-eol-003.html
index 61e9c50bf5a..7b562e8a0f7 100644
--- a/tests/wpt/tests/css/css-ui/caret-eol-003.html
+++ b/tests/wpt/tests/css/css-ui/caret-eol-003.html
@@ -1,10 +1,10 @@
-<!DOCTYPE html>
+<!DOCTYPE html>
 <html lang=en>
 <meta charset="utf-8">
 <title>CSS Basic User Interface Test: end-of-line carets should be visible</title>
 <link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net">
 <link rel="help" href="http://www.w3.org/TR/css4-ui/#caret-shape">
-<link rel=match href=reference/caret-eol-001.html>
+<link rel="mismatch" href=reference/caret-eol-001.html>
 <meta name="assert" content="Checks that carets positioned at the end of the line are shown even if they overflow, even if the box has overflow: clip.">
 <style>
 div {
@@ -28,4 +28,4 @@ div {
 const t = document.querySelector("#test");
 window.getSelection().selectAllChildren(t);
 window.getSelection().collapseToEnd();
-</script>
+</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-ui/parsing/cursor-computed.html b/tests/wpt/tests/css/css-ui/parsing/cursor-computed.html
index 76b3201016c..478e9c1fca5 100644
--- a/tests/wpt/tests/css/css-ui/parsing/cursor-computed.html
+++ b/tests/wpt/tests/css/css-ui/parsing/cursor-computed.html
@@ -49,6 +49,10 @@ test_computed_value("cursor", "all-scroll");
 test_computed_value("cursor", "zoom-in");
 test_computed_value("cursor", "zoom-out");
 
+test_computed_value("cursor", "linear-gradient(200grad, red 10%, blue calc(75% - 2px)), auto", "linear-gradient(rgb(255, 0, 0) 10%, rgb(0, 0, 255) calc(75% - 2px), auto");
+test_computed_value("cursor", "radial-gradient(farthest-side at calc(5px + 10%), red, blue), pointer", "radial-gradient(farthest-side at calc(10% + 5px) 50%, rgb(255, 0, 0), rgb(0, 0, 255)), pointer");
+test_computed_value("cursor", "conic-gradient(from 3.1416rad at 20% 20%, red, blue), crosshair", "conic-gradient(from 180deg at 20% 20%, rgb(255, 0, 0), rgb(0, 0, 255), pointer");
+
 // Not yet tested: // [ [<url> [<x> <y>]?,]*
 // "relative URLs converted to absolute"
 </script>
diff --git a/tests/wpt/tests/css/css-ui/reference/caret-eol-001.html b/tests/wpt/tests/css/css-ui/reference/caret-eol-001.html
index dc8f37feaee..c3db99519a7 100644
--- a/tests/wpt/tests/css/css-ui/reference/caret-eol-001.html
+++ b/tests/wpt/tests/css/css-ui/reference/caret-eol-001.html
@@ -7,6 +7,7 @@
 div {
     font-size: 40px;
     font-family: monospace;
+    width: 5ch;
     caret-color: orange;
     caret-shape: block;
     caret-animation: manual;
@@ -17,7 +18,7 @@ div {
 
 <p>Test passes if you see a orange text insertion caret at the end of the line below.
 
-<div id=test contenteditable spellcheck="false">abcde</div>
+<div id=test spellcheck="false">abcde</div>
 
 <script>
 const t = document.querySelector("#test");
diff --git a/tests/wpt/tests/css/css-values/attr-all-types.html b/tests/wpt/tests/css/css-values/attr-all-types.html
index cc34eb3cbb4..e8da82eeb19 100644
--- a/tests/wpt/tests/css/css-values/attr-all-types.html
+++ b/tests/wpt/tests/css/css-values/attr-all-types.html
@@ -6,6 +6,11 @@
 <script src="/resources/testharnessreport.js"></script>
 
 <style>
+    @property --number {
+        syntax: "<number>";
+        inherits: false;
+        initial-value: 3;
+    }
     @property --length {
         syntax: "<length>";
         inherits: false;
@@ -91,8 +96,9 @@
     }
 
     test_valid_attr('content', 'attr(data-foo)', 'abc', '"abc"');
-    test_invalid_attr('content', 'attr(data-foo string)', 'abc');
+    test_valid_attr('content', 'attr(data-foo)', 'var(--number)', '"var(--number)"');
     test_valid_attr('content', 'attr(data-foo raw-string)', 'abc', '"abc"');
+    test_valid_attr('content', 'attr(data-foo raw-string)', 'var(--number)', '"var(--number)"');
     test_valid_attr('content', 'attr(data-foo,)', 'abc', '"abc"');
     test_valid_attr('content', 'attr(data-foo, 3)', 'attr(', '"attr("');
     test_valid_attr('content', 'attr(data-foo)', 'attr(', '"attr("');
@@ -158,6 +164,8 @@
     test_valid_attr('font-size', 'attr(data-foo %)', '10', '10%');
     test_valid_attr('--x', 'attr(data-foo px) 11px', '10', '10px 11px');
 
+    test_valid_attr('font-weight', 'attr(data-foo number)', '10', '10');
+
     test_valid_attr('--x', 'attr(data-foo type(<number>)) 11', '10', '10 11');
     test_valid_attr('--string', 'attr(data-foo type(<string>))', '"hello"', '"hello"');
     test_valid_attr('--string-list', 'attr(data-foo type(<string>+))', '"hello" "hi"', '"hello" "hi"');
@@ -173,6 +181,7 @@
 
     test_dimension_types_and_units();
 
+    test_invalid_attr('content', 'attr(data-foo string)', 'abc');
     test_invalid_attr('animation-name', 'attr(data-foo type(string))', 'abc');
     test_invalid_attr('animation-name', 'attr(data-foo type(< string>))', 'abc');
     test_invalid_attr('animation-name', 'attr(data-foo type(<string >))', 'abc');
@@ -217,6 +226,12 @@
     test_invalid_attr('width', 'attr(data-foo px)', '10px');
     test_invalid_attr('width', 'attr(data-foo <px>)', '10');
     test_invalid_attr('width', 'attr(data-foo xx)', '10');
+    test_invalid_attr('width', 'attr(data-foo px)', 'calc(1 + 3)');
+    test_invalid_attr('width', 'attr(data-foo px)', 'var(--number)');
+
+    test_invalid_attr('font-weight', 'attr(data-foo number)', 'calc(1 + 3)');
+    test_invalid_attr('font-weight', 'attr(data-foo number)', 'var(--number)');
+
     test_invalid_attr('transition-duration', 'attr(data-foo ms)', '10px');
     test_invalid_attr('transition-duration', 'attr(data-foo ms)', '10px foo');
 
diff --git a/tests/wpt/tests/css/css-values/typed-arithmetic-different-categories-crash.html b/tests/wpt/tests/css/css-values/typed-arithmetic-different-categories-crash.html
new file mode 100644
index 00000000000..e3dd6bbdabb
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/typed-arithmetic-different-categories-crash.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<title>CSS Values Test: typed arithmetic with different categories crash</title>
+<link rel="help" href="https://issues.chromium.org/issues/445824614">
+<style>
+  body {
+    stroke-dasharray: calc(0.5px * 2 / -4500000000kHz);
+  }
+</style>
diff --git a/tests/wpt/tests/css/css-values/typed_arithmetic.html b/tests/wpt/tests/css/css-values/typed_arithmetic.html
index f4258c33287..37f560d241e 100644
--- a/tests/wpt/tests/css/css-values/typed_arithmetic.html
+++ b/tests/wpt/tests/css/css-values/typed_arithmetic.html
@@ -5,6 +5,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/numeric-testcommon.js"></script>
 <script src="/css/support/computed-testcommon.js"></script>
+<script src="../support/parsing-testcommon.js"></script>
 <style>
 :root {
   font-size: 10px;
@@ -41,6 +42,26 @@ test_math_used("calc(10em / 1rem)", "10", {"prop": "z-index"});
 test_math_used("calc(10em / 1px)", "100", {"prop": "z-index"});
 test_math_used("calc(1px / 10em * NaN)", "0", {"prop": "z-index"});
 
+// 10% -> 1px; 1px / 1px -> 1.
+test_math_used("calc(10% / 1px)", "1", {"prop": "line-height"});
+// 1% * 100% / 10% -> 10%.
+test_math_used("calc(1% * 100% / 10%)", "10%", {"prop": "line-height"});
+// 10% / 10% -> 1.
+test_math_used("calc(10% / 10%)", "1", {"prop": "line-height"});
+// 10% -> 1px; 1% -> 0.1px; 1px / 0.1px / 1px -> 10px.
+test_math_used("calc((10% * 1%) / 1px)", "10px");
+// 10% -> 1px; 1px * 1px / 1px * 10deg / 1deg / 10px -> 1.
+test_math_used("calc(10% * 10% / 1px * 10deg / 1deg / 10px)", "1", {"prop": "line-height"});
+// 10% -> 1px; 1px * 1px / 1px * 1deg / 1deg -> 1px.
+test_math_used("calc(10% * 10% / 1px * 1deg / 1deg)", "1px", {"prop": "line-height"});
+// 1px * 2deg / 1deg -> 2px.
+test_math_used("calc(1px * 2deg / 1deg)", "2px", {"prop": "line-height"});
+// 1px * 3deg / 1deg / 1px -> 3.
+test_math_used("calc(1px * 3deg / 1deg / 1px)", "3", {"prop": "line-height"});
+
+test_invalid_value("width", "calc((1% * 1deg) / 1px)");
+test_invalid_value("width", "calc((1% * 1% * 1%) / 1px)");
+
 testComputedValueGreaterOrLowerThan("width", "calc(1px * 10em / 0em)", REALLY_LARGE);
 testComputedValueGreaterOrLowerThan("width", "calc(1px / 1px * 10em * infinity)", REALLY_LARGE);
 testComputedValueGreaterOrLowerThan("margin-left", "calc(1px * 10em / -0em)", REALLY_LARGE_NEGATIVE);
diff --git a/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text-ref.html b/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text-ref.html
index ec5d8712000..fbef599b8b1 100644
--- a/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text-ref.html
@@ -8,6 +8,7 @@
 <style>
 :root {
   font: 20px/1 Ahem;
+  scrollbar-width: none;
 }
 
 #target {
diff --git a/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text.html b/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text.html
index 61b3dc1329c..cea94359ca0 100644
--- a/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text.html
+++ b/tests/wpt/tests/css/css-view-transitions/block-with-overflowing-text.html
@@ -13,6 +13,7 @@
 <style>
 :root {
   font: 20px/1 Ahem;
+  scrollbar-width: none;
 }
 #target {
   text-shadow: red -20px -50px;
diff --git a/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants-ref.html b/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants-ref.html
index c47b31e4d5a..4e7a5ae94d2 100644
--- a/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants-ref.html
@@ -5,6 +5,9 @@
 <link rel="author" href="mailto:vmpstr@chromium.org">
 
 <style>
+:root {
+  scrollbar-width: none;
+}
 body {
   background: pink;
 }
diff --git a/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants.html b/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants.html
index 45776052491..1a639ce9c58 100644
--- a/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants.html
+++ b/tests/wpt/tests/css/css-view-transitions/capture-with-visibility-mixed-descendants.html
@@ -8,6 +8,9 @@
 <script src="/common/reftest-wait.js"></script>
 
 <style>
+:root {
+  scrollbar-width: none;
+}
 .target {
   width: 100px;
   height: 100px;
diff --git a/tests/wpt/tests/css/css-view-transitions/content-with-clip-ref.html b/tests/wpt/tests/css/css-view-transitions/content-with-clip-ref.html
index 81fbabe3c53..2ae82640a33 100644
--- a/tests/wpt/tests/css/css-view-transitions/content-with-clip-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/content-with-clip-ref.html
@@ -3,6 +3,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
 <link rel="author" href="mailto:vmpstr@chromium.org">
 <style>
+:root {
+  scrollbar-width: none;
+}
 .target {
   contain: paint;
   width: 100px;
diff --git a/tests/wpt/tests/css/css-view-transitions/content-with-clip.html b/tests/wpt/tests/css/css-view-transitions/content-with-clip.html
index 9c9f2385c17..da25a9cebf5 100644
--- a/tests/wpt/tests/css/css-view-transitions/content-with-clip.html
+++ b/tests/wpt/tests/css/css-view-transitions/content-with-clip.html
@@ -7,6 +7,9 @@
 
 <script src="/common/reftest-wait.js"></script>
 <style>
+:root {
+  scrollbar-width: none;
+}
 .target {
   contain: paint;
   width: 100px;
diff --git a/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object-ref.html b/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object-ref.html
index 10e04ac58a4..9643ebcae93 100644
--- a/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object-ref.html
@@ -5,6 +5,10 @@
 <link rel="author" href="mailto:khushalsagar@chromium.org">
 
 <style>
+:root {
+  scrollbar-width: none;
+}
+
 body {
   width: 100vw;
   height: 100vh;
diff --git a/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object.html b/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object.html
index ea2d17b2761..37856ac02d8 100644
--- a/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object.html
+++ b/tests/wpt/tests/css/css-view-transitions/exit-transition-with-anonymous-layout-object.html
@@ -7,6 +7,10 @@
 
 <script src="/common/reftest-wait.js"></script>
 <style>
+:root {
+  scrollbar-width: none;
+}
+
 body {
   width: 100vw;
   height: 100vh;
diff --git a/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored-ref.html b/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored-ref.html
index 626e03d012f..3bb0ecacc37 100644
--- a/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored-ref.html
@@ -4,6 +4,9 @@
 <link rel="author" href="mailto:vmpstr@chromium.org">
 
 <style>
+:root {
+  scrollbar-width: none;
+}
 body { background: pink }
 #spacer {
   width: 100px;
diff --git a/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored.html b/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored.html
index bab52f15676..f6d61c6fdbb 100644
--- a/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored.html
+++ b/tests/wpt/tests/css/css-view-transitions/fragmented-at-start-ignored.html
@@ -7,6 +7,9 @@
 
 <script src="/common/reftest-wait.js"></script>
 <style>
+:root {
+  scrollbar-width: none;
+}
 #spacer {
   width: 100px;
   height: 950px;
diff --git a/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block-ref.html b/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block-ref.html
index 2eebf8cf596..45282fc89d3 100644
--- a/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block-ref.html
@@ -5,6 +5,9 @@
 <link rel="author" href="mailto:khushalsagar@chromium.org">
 
 <style>
+  :root {
+    scrollbar-width: none;
+  }
   .outer {
     transform: scale3d(2, 2, 1);
     width: 100vw;
diff --git a/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block.html b/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block.html
index 77fb0570966..ebf8c013bfc 100644
--- a/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block.html
+++ b/tests/wpt/tests/css/css-view-transitions/inline-with-offset-from-containing-block.html
@@ -9,6 +9,9 @@
 <script src="/common/reftest-wait.js"></script>
 <script src="/common/rendering-utils.js"></script>
 <style>
+  :root {
+    scrollbar-width: none;
+  }
   .outer {
     transform: scale(2);
     width: 100vw;
diff --git a/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/instant-transition-finish-before-swap.https.html b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/instant-transition-finish-before-swap.https.html
new file mode 100644
index 00000000000..5c99cb0cc3f
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/instant-transition-finish-before-swap.https.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<title>
+  View transitions: a short transition started after navigation-triggering input can run until its
+  end
+</title>
+<link
+  rel="help"
+  href="https://github.com/w3c/csswg-drafts/blob/main/css-view-transitions-2/two-phase-transition-explainer.md"
+/>
+<meta name="timeout" content="long" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+  promise_test(async (t) => {
+    // We use a service worker to control the timing of the transition, so that committing the navigation
+    // is synchronized with the transition timing.
+    // Specifically, the navigation commit is delayed until the same-document view-transition is ready (starts animating),
+    // but should take place before it is finished. That simulates a view transition that is "interrupted" by a commit by default,
+    // allowing the two-phase view transition feature to carry it through instead.
+    const registration = await service_worker_unregister_and_register(t, "sw.js", "resources");
+    t.add_cleanup(() => registration.unregister());
+    const worker = registration.installing;
+    await wait_for_state(t, worker, "activated");
+    const did_activate_transition = new Promise((resolve) => {
+      window.did_activate_transition = resolve;
+    });
+    const did_finish_transition = new Promise((resolve) => {
+      window.did_finish_transition = resolve;
+    });
+    const did_swap = new Promise((resolve) => {
+      window.did_swap = resolve;
+    });
+    const popup = window.open("resources/instant-transition.https.html");
+    t.add_cleanup(() => popup.close());
+    const condition = await did_activate_transition;
+    worker.postMessage({ resume: "" + condition });
+    const result = await Promise.race([did_finish_transition, did_swap.then(() => "swap")]);
+    assert_equals(result, "success");
+    const with_transition = await did_swap;
+    assert_equals(with_transition, "with-transition");
+  }, "view transition should run until its end if started after navigation-triggering input");
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/resources/instant-transition.https.html b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/resources/instant-transition.https.html
new file mode 100644
index 00000000000..741a7042381
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/resources/instant-transition.https.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<script>
+onpageswap = e => {
+  window.opener.did_swap(e.viewTransition ? "with-transition" : "without-transition");
+}
+
+window.onload = async () => {
+  await new Promise((resolve) => requestAnimationFrame(resolve));
+  const pause_condition = new Date().valueOf();
+  const a = document.createElement("a");
+  a.href = `?pause=${pause_condition}`;
+  document.body.appendChild(a);
+  a.click();
+  await new Promise((resolve) => requestAnimationFrame(resolve));
+  const transition = document.startViewTransition(() => {
+    document.body.classList.add("vt-done");
+  });
+
+  await transition.ready;
+  window.opener.did_activate_transition(pause_condition);
+  try {
+    await transition.finished;
+  } catch (e) {
+    window.opener.did_finish_transition("skip");
+  } finally {
+    window.opener.did_finish_transition("success");
+  }
+};
+
+</script>
+<style>
+  @view-transition {
+    navigation: auto;
+  }
+
+  * {
+    animation-duration:800ms;
+  }
+
+</style>
+</body>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/sw.js b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/sw.js
new file mode 100644
index 00000000000..31210ac1700
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/navigation/two-phase/sw.js
@@ -0,0 +1,35 @@
+// Copyright 2025 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+const pause_conditions = {};
+async function pause(condition) {
+  if (condition)
+    await new Promise(resolve => {
+      pause_conditions[condition] = resolve;
+    });
+}
+
+function resume(condition) {
+  const resolve = pause_conditions[condition];
+  if (resolve) {
+    resolve();
+    delete pause_conditions[condition];
+  }
+}
+
+onmessage = async (message) => {
+  if ('resume' in message.data) {
+    resume(message.data.resume);
+  }
+};
+
+onfetch = async (event) => {
+  const response = fetch(event.request);
+  if (!event.request.url.includes('pause')) {
+    event.respondWith(response);
+    return;
+  }
+
+  event.respondWith(pause(new URL(event.request.url).searchParams.get('pause'))
+                        .then(() => response));
+};
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-view-transitions/root-scrollbar-with-fixed-background-ref.html b/tests/wpt/tests/css/css-view-transitions/root-scrollbar-with-fixed-background-ref.html
index bc2c5862bf5..60018809f46 100644
--- a/tests/wpt/tests/css/css-view-transitions/root-scrollbar-with-fixed-background-ref.html
+++ b/tests/wpt/tests/css/css-view-transitions/root-scrollbar-with-fixed-background-ref.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html class="reftest-wait">
+<html class="reftest-wait" style="background: lightblue;">
 <title>View transitions: capture root element with scrollbar (ref)</title>
 <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
 <link rel="author" href="mailto:khushalsagar@chromium.org">
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition-ref.html b/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition-ref.html
new file mode 100644
index 00000000000..11b8d382449
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
+  <style>
+    .box {
+      position: absolute;
+      z-index: 0;
+      will-change: transform;
+      contain: strict;
+    }
+    #scope {
+      position: absolute;
+      background: #eee;
+      left: 40px;
+      top: 40px;
+      width: 490px;
+      height: 190px;
+    }
+    .part {
+      left: 30px;
+      top: 30px;
+      width: 120px;
+      height: 120px;
+      background-color: purple;
+      transform: translateX(150px);
+      outline: 5px solid green;
+    }
+  </style>
+</head>
+<body>
+  <div id=scope class=box>
+    <div class="part box"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition.html b/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition.html
new file mode 100644
index 00000000000..72d7e16d7f5
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/display-change-during-transition.html
@@ -0,0 +1,94 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
+  <link rel="match" href="display-change-during-transition-ref.html">
+  <meta name="fuzzy" content="maxDifference=0-2;totalPixels=0-14400">
+  <style>
+    .tr {
+      view-transition-name: demo;
+    }
+    ::view-transition {
+      pointer-events: none;
+    }
+    ::view-transition-group(demo) {
+      /* freeze animation at midpoint */
+      animation-duration: 10000s;
+      animation-delay: -5000s;
+      animation-timing-function: cubic-bezier(0, 1, 1, 0);
+      display: block;
+      outline: 5px solid red;
+    }
+    ::view-trnasition-image-pair(demo),
+    ::view-transition-old(demo),
+    ::view-transtion-new(demo) {
+      /* No cross-fade */
+      animaton: unset;
+    }
+    .box {
+      position: absolute;
+      z-index: 0;
+      will-change: transform;
+      contain: strict;
+    }
+    #scope {
+      position: absolute;
+      background: #eee;
+      left: 40px;
+      top: 40px;
+      width: 490px;
+      height: 190px;
+    }
+    .part {
+      left: 30px;
+      top: 30px;
+      width: 120px;
+      height: 120px;
+      background-color: purple;
+    }
+    .part.state2 {
+      transform: translateX(300px);
+    }
+  </style>
+</head>
+<script src="/common/reftest-wait.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<body>
+  <div id=scope class=box>
+    <div class="part box tr state1"></div>
+  </div>
+</body>
+<script>
+  function animationStartPromise() {
+    return new Promise(resolve => {
+      const listener = event => {
+        document.removeEventListener('animationstart', listener);
+        resolve();
+      };
+      document.addEventListener('animationstart', listener);
+    });
+  }
+
+  window.onload = async () => {
+    const animationStarted = animationStartPromise();
+    const vt = scope.startViewTransition(() => {
+      scope.querySelector('.part').classList.toggle('state2');
+    });
+    await vt.ready;
+    await animationStarted;
+    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      const new_style = document.createElement('style');
+      new_style.innerText =
+          "::view-transition-group(demo):not(:only-child) { " +
+          "  display: flex;" +
+          "  outline: 5px solid green;" +
+          "}";
+      document.head.appendChild(new_style);
+    });
+    takeScreenshot();
+  };
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static.html b/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static.html
index fcea95e6efd..7f109af4720 100644
--- a/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static.html
+++ b/tests/wpt/tests/css/css-view-transitions/snapshot-containing-block-static.html
@@ -10,7 +10,8 @@
 <style>
 :root {
   view-transition-name: none;
-  background-color: red;
+  background-color: limegreen;
+  box-shadow: 0 0 0 10px inset red;
 }
 
 body {
diff --git a/tests/wpt/tests/css/css-view-transitions/table-root-transition-crash.html b/tests/wpt/tests/css/css-view-transitions/table-root-transition-crash.html
new file mode 100644
index 00000000000..48fe0f273ba
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/table-root-transition-crash.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1990582">
+<script>
+  document.addEventListener("DOMContentLoaded", async () => {
+    document.documentElement.style.display = "inline table"
+    document.startViewTransition(undefined)
+  })
+</script>
diff --git a/tests/wpt/tests/css/filter-effects/backdrop-filter-fixed-clip.html b/tests/wpt/tests/css/filter-effects/backdrop-filter-fixed-clip.html
index 346fad93f34..0c1db348f52 100644
--- a/tests/wpt/tests/css/filter-effects/backdrop-filter-fixed-clip.html
+++ b/tests/wpt/tests/css/filter-effects/backdrop-filter-fixed-clip.html
@@ -4,6 +4,7 @@
 <link rel="author" href="mailto:masonf@chromium.org">
 <link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
 <link rel="match"  href="backdrop-filter-fixed-clip-ref.html">
+<meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-54400">
 
 <div style="width:600px;">
   <p>Expected: A green box, overlapping red box, and a small, inset cyan box. The<br>
diff --git a/tests/wpt/tests/custom-elements/META.yml b/tests/wpt/tests/custom-elements/META.yml
index e30f6fc97f9..d68b5fd46c7 100644
--- a/tests/wpt/tests/custom-elements/META.yml
+++ b/tests/wpt/tests/custom-elements/META.yml
@@ -1,7 +1,6 @@
 spec: https://html.spec.whatwg.org/multipage/custom-elements.html
 suggested_reviewers:
   - snuggs
-  - domenic
   - hayatoito
   - kojiishi
   - rniwa
diff --git a/tests/wpt/tests/custom-elements/registries/WEB_FEATURES.yml b/tests/wpt/tests/custom-elements/registries/WEB_FEATURES.yml
index c8486615c1e..7dbe4c6283f 100644
--- a/tests/wpt/tests/custom-elements/registries/WEB_FEATURES.yml
+++ b/tests/wpt/tests/custom-elements/registries/WEB_FEATURES.yml
@@ -4,6 +4,15 @@ features:
   - define.html
   - per-global.html
   - upgrade.html
+  - valid-custom-element-names.html
 - name: customized-built-in-elements
   files:
   - define-customized-builtins.html
+- name: scoped-custom-element-registries
+  files:
+  - "*"
+  - "!define-customized-builtins.html"
+  - "!define.html"
+  - "!per-global.html"
+  - "!upgrade.html"
+  - "!valid-custom-element-names.html"
diff --git a/tests/wpt/tests/custom-elements/registries/valid-custom-element-names.html b/tests/wpt/tests/custom-elements/registries/valid-custom-element-names.html
index 72a5999e3a9..900c41f40d5 100644
--- a/tests/wpt/tests/custom-elements/registries/valid-custom-element-names.html
+++ b/tests/wpt/tests/custom-elements/registries/valid-custom-element-names.html
@@ -113,26 +113,25 @@ function createElementClass() {
   return newClass;
 }
 
-promise_test(async t => {
-  for (const validName of validCustomElementNames) {
-    try {
-      const newClass = createElementClass();
-      customElements.define(validName, newClass);
-      await customElements.whenDefined(validName);
-    } catch (error) {
-      assert_unreached(`Custom element name should have been valid but threw error: ${debugString(validName)} ${error.toString()}`);
-    }
-  }
+for (const validName of validCustomElementNames) {
+  promise_test(async t => {
+    const newClass = createElementClass();
+    customElements.define(validName, newClass);
+    await customElements.whenDefined(validName);
+  }, `Valid custom element name: ${debugString(validName)}`);
+}
 
-  for (const invalidName of invalidCustomElementNames) {
+for (const invalidName of invalidCustomElementNames) {
+  promise_test(async t => {
     const newClass = createElementClass();
     assert_throws_dom(
       'SyntaxError',
       () => customElements.define(invalidName, newClass),
-      `customElements.define should have thrown for invalid name: ${debugString(invalidName)}`);
+      `customElements.define should have thrown`);
     await promise_rejects_dom(t, 'SyntaxError',
       customElements.whenDefined(invalidName),
-      `customElements.whenDefined should have thrown for invalid name: ${debugString(invalidName)}`);
-  }
-});
+      `customElements.whenDefined should have thrown`);
+  }, `Invalid custom element name: ${debugString(invalidName)}`);
+}
+
 </script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html b/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
index 2a73c1743b4..d9e681aed77 100644
--- a/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
@@ -6,33 +6,7 @@
 <script src="helper.js" type="module"></script>
 
 <script type="module">
-  import { expireCookie, documentHasCookie, waitForCookie, addCookieAndSessionCleanup, setupShardedServerState, configureServer } from "./helper.js";
-
-  // Create an iframe that fetches URLs on demand via postMessage.
-  async function createFrame(url) {
-    const frame = document.createElement('iframe');
-    const promise = new Promise((resolve, reject) => {
-      frame.onload = () => resolve(frame);
-      frame.onerror = () => {
-        reject();
-      };
-    });
-    frame.src = url;
-    document.body.appendChild(frame);
-    return promise;
-  }
-
-  async function crossSiteFetch(frame, url) {
-    let promise = new Promise((resolve) => {
-      const listener = (event) => {
-        window.removeEventListener("message", listener);
-        resolve(event.data);
-      };
-      window.addEventListener("message", listener);
-    });
-    frame.contentWindow.postMessage(url, "*");
-    return promise;
-  }
+  import { expireCookie, documentHasCookie, waitForCookie, addCookieAndSessionCleanup, setupShardedServerState, configureServer, crossSiteFetch } from "./helper.js";
 
   async function runTest(t, origin, refresh_expected) {
     await setupShardedServerState({crossSite: true});
@@ -51,14 +25,12 @@
     assert_equals(loginResponse.status, 200);
     await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
 
-    const frame = await createFrame(`${origin}/device-bound-session-credentials/url_fetcher.html`);
-
     // Expire the cookie, and check whether a refresh has occurred.
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
 
-    const authStatusAfterExpiry = await crossSiteFetch(frame, `${location.protocol}//${location.host}/device-bound-session-credentials/verify_authenticated.py`);
-    assert_equals(authStatusAfterExpiry, refresh_expected ? 200 : 401);
+    const authStatusAfterExpiry = await crossSiteFetch(origin, `${location.origin}/device-bound-session-credentials/verify_authenticated.py`, {credentials: "include"});
+    assert_equals(authStatusAfterExpiry, refresh_expected ? 200 : 403);
     assert_equals(documentHasCookie(expectedCookieAndValue), refresh_expected);
   }
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/clear-site-data.https.html b/tests/wpt/tests/device-bound-session-credentials/clear-site-data.https.html
index ba76a901662..d37415f71ce 100644
--- a/tests/wpt/tests/device-bound-session-credentials/clear-site-data.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/clear-site-data.https.html
@@ -28,7 +28,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponse = await fetch('verify_authenticated.py');
-    assert_equals(authResponse.status, 401);
+    assert_equals(authResponse.status, 403);
     assert_false(documentHasCookie(expectedCookieAndValue));
   }, "A session ended with Clear-Site-Data: 'cookies' does not refresh cookies");
 
@@ -53,7 +53,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponse = await fetch('verify_authenticated.py');
-    assert_equals(authResponse.status, 401);
+    assert_equals(authResponse.status, 403);
     assert_false(documentHasCookie(expectedCookieAndValue));
   }, "A session ended with Clear-Site-Data: 'storage' does not refresh cookies")
 </script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html b/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html
index 69510b28fde..17e4aac1201 100644
--- a/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html
@@ -34,7 +34,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponseAfterExpiry = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterExpiry.status, 401);
+    assert_equals(authResponseAfterExpiry.status, 403);
     assert_false(documentHasCookie(expectedCookieAndValue));
   }, "An empty response fails on registration");
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/fetch-no-credentials.https.html b/tests/wpt/tests/device-bound-session-credentials/fetch-no-credentials.https.html
index bd87e688648..d258c6e78a7 100644
--- a/tests/wpt/tests/device-bound-session-credentials/fetch-no-credentials.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/fetch-no-credentials.https.html
@@ -6,7 +6,7 @@
 <script src="helper.js" type="module"></script>
 
 <script type="module">
-  import { documentHasCookie, expireCookie, waitForCookie, addCookieAndSessionCleanup, setupShardedServerState, configureServer } from "./helper.js";
+  import { documentHasCookie, expireCookie, waitForCookie, addCookieAndSessionCleanup, setupShardedServerState, configureServer, crossSiteFetch } from "./helper.js";
 
   promise_test(async t => {
     const testId = await setupShardedServerState();
@@ -21,33 +21,8 @@
 
     // Expire the cookies
     expireCookie(expectedCookieAndAttributes);
-
-    // Setup for receiving messages
-    let messageCallbacks = [];
-    function messageListener(event) {
-      if (messageCallbacks.length > 0) {
-          messageCallbacks[0](event.data);
-          messageCallbacks.shift();
-      }
-    };
-    window.addEventListener("message", messageListener);
-    t.add_cleanup(() => {
-      window.removeEventListener("message", messageListener);
-    });
-
-    function getMessage() {
-        return new Promise((resolve, reject) => {
-            messageCallbacks.push(resolve);
-        });
-    }
-
-    // Create a cross-site iframe that's going to try to fetch without credentials
-    let iframe = document.createElement('iframe');
-    iframe.src = `${get_host_info().HTTPS_NOTSAMESITE_ORIGIN}/device-bound-session-credentials/fetch-verify-authenticated.https.html`;
-    document.body.appendChild(iframe);
-
-    let statusCode = await getMessage();
-    assert_equals(statusCode, 401);
+    let statusCode = await crossSiteFetch(get_host_info().HTTPS_NOTSAMESITE_ORIGIN, `${location.origin}/device-bound-session-credentials/verify_authenticated.py` , {credentials: "omit"});
+    assert_equals(statusCode, 403);
 
     // We should not have refreshed.
     assert_false(documentHasCookie(expectedCookieAndValue));
diff --git a/tests/wpt/tests/device-bound-session-credentials/fetch-verify-authenticated.https.html b/tests/wpt/tests/device-bound-session-credentials/fetch-verify-authenticated.https.html
deleted file mode 100644
index d9e3df9f5c6..00000000000
--- a/tests/wpt/tests/device-bound-session-credentials/fetch-verify-authenticated.https.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<script src="/common/get-host-info.sub.js"></script>
-<body>
-  <script>
-    async function onload() {
-      let base_origin = get_host_info().ORIGIN;
-      let response = await fetch(`${base_origin}/device-bound-session-credentials/verify_authenticated.py`, {credentials: "omit"});
-      window.parent.postMessage(response.status, base_origin);
-    }
-    onload();
-  </script>
-</body>
diff --git a/tests/wpt/tests/device-bound-session-credentials/helper.js b/tests/wpt/tests/device-bound-session-credentials/helper.js
index e364e2e24f1..8b2df67aa2e 100644
--- a/tests/wpt/tests/device-bound-session-credentials/helper.js
+++ b/tests/wpt/tests/device-bound-session-credentials/helper.js
@@ -69,3 +69,29 @@ export async function pullServerState() {
   assert_equals(response.status, 200);
   return await response.json();
 }
+
+// Create an iframe that fetches URLs on demand via postMessage.
+export async function crossSiteFetch(fromSite, url, fetchParams) {
+  const frame = document.createElement('iframe');
+  const frameLoadPromise = new Promise((resolve, reject) => {
+    frame.onload = resolve;
+    frame.onerror = reject;
+  });
+  frame.src = fromSite + "/device-bound-session-credentials/url_fetcher.html";
+  document.body.appendChild(frame);
+  await frameLoadPromise;
+
+  const fetchStatusPromise = new Promise((resolve) => {
+    const listener = (event) => {
+      window.removeEventListener("message", listener);
+      resolve(event.data);
+    };
+    window.addEventListener("message", listener);
+  });
+  frame.contentWindow.postMessage({url, fetchParams}, "*");
+
+  const fetchStatus = await fetchStatusPromise;
+  document.body.removeChild(frame);
+
+  return fetchStatus;
+}
diff --git a/tests/wpt/tests/device-bound-session-credentials/include-site.https.html b/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
index 6f5d1217bc2..a0ea1946f66 100644
--- a/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
@@ -26,7 +26,7 @@
     const url = `${location.protocol}//www1.${location.host}/device-bound-session-credentials/verify_authenticated.py`;
     const authResponseAfterExpiry = await fetch(url, {credentials: "include"});
     // The cookie should only be refreshed if the session includes the whole site.
-    assert_equals(authResponseAfterExpiry.status, includeSite ? 200 : 401);
+    assert_equals(authResponseAfterExpiry.status, includeSite ? 200 : 403);
     assert_equals(documentHasCookie(expectedCookieAndValue), includeSite);
   }
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/jwt_helper.py b/tests/wpt/tests/device-bound-session-credentials/jwt_helper.py
index 4edcddb1962..4597cedb21e 100644
--- a/tests/wpt/tests/device-bound-session-credentials/jwt_helper.py
+++ b/tests/wpt/tests/device-bound-session-credentials/jwt_helper.py
@@ -22,7 +22,7 @@ def decode_jwt(token, key=None):
         # If there is a key passed in (for refresh), use that for checking the signature below.
         # Otherwise (for registration), use the key sent within the JWT to check the signature.
         if key == None:
-            key = decoded_payload.get('key')
+            key = decoded_header.get('jwk')
         public_key = serialization.load_pem_public_key(jwk_to_pem(key))
         # Verifying the signature will throw an exception if it fails.
         verify_rs256_signature(header, payload, signature, public_key)
diff --git a/tests/wpt/tests/device-bound-session-credentials/login.py b/tests/wpt/tests/device-bound-session-credentials/login.py
index 22b0beeaf3e..aa0dc32d608 100644
--- a/tests/wpt/tests/device-bound-session-credentials/login.py
+++ b/tests/wpt/tests/device-bound-session-credentials/login.py
@@ -37,7 +37,7 @@ def main(request, response):
 
     registrations = []
     for i in range(num_sessions):
-        registrations.append(('Sec-Session-Registration', ";".join(header_items)))
+        registrations.append(('Secure-Session-Registration', ";".join(header_items)))
 
     headers = []
     if request.headers.get(b"origin") is not None:
@@ -50,7 +50,7 @@ def main(request, response):
         ]
 
     if use_single_header:
-        combined_registrations = [("Sec-Session-Registration", ", ".join([registration[1] for registration in registrations]))]
+        combined_registrations = [("Secure-Session-Registration", ", ".join([registration[1] for registration in registrations]))]
         return (200, headers + combined_registrations, "")
     else:
         return (200, headers + registrations, "")
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
index 886b67358fe..ba11f4d02cb 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
@@ -31,5 +31,5 @@
     const authResponseAfterExpiry = await fetch('verify_authenticated.py');
     assert_equals(authResponseAfterExpiry.status, 200);
     assert_true(documentHasCookie(expectedCookieAndValue));
-}, "Refresh does not send back Sec-Session-Challenge");
-</script>
\ No newline at end of file
+}, "Refresh does not send back Secure-Session-Challenge");
+</script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
index 342269836b0..3951a872998 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
@@ -28,7 +28,7 @@
       method: 'POST',
       body: expectedCookieAndValue2
     });
-    assert_equals(alternateAuthResponse.status, 401);
+    assert_equals(alternateAuthResponse.status, 403);
 
     // Configure server to change the cookie in the session config on next refresh.
     await configureServer({ cookieDetails: [{ nameAndValue: expectedCookieAndValue2 }] });
@@ -37,7 +37,7 @@
     expireCookie(expectedCookieAndAttributes1);
     assert_false(documentHasCookie(expectedCookieAndValue1));
     const authResponseAfterExpiry1 = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterExpiry1.status, 401);
+    assert_equals(authResponseAfterExpiry1.status, 403);
     assert_false(documentHasCookie(expectedCookieAndValue1));
 
     // Confirm the alternate cookie is set and included in requests.
@@ -91,7 +91,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponseAfterTermination = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterTermination.status, 401);
+    assert_equals(authResponseAfterTermination.status, 403);
 
     // Because refresh failed, we still do not have the cookie
     assert_false(documentHasCookie(expectedCookieAndValue));
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
index bb4cbd08d33..a24b65ddc1f 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
@@ -29,7 +29,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponseAfterExpiry = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterExpiry.status, 401);
+    assert_equals(authResponseAfterExpiry.status, 403);
     assert_false(documentHasCookie(expectedCookieAndValue));
   }, "A session ended with continue:false does not refresh cookies");
 </script>
\ No newline at end of file
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh_session.py b/tests/wpt/tests/device-bound-session-credentials/refresh_session.py
index ff804f63c0a..6852589d71c 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh_session.py
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh_session.py
@@ -10,7 +10,7 @@ def main(request, response):
     if test_session_manager.get_refresh_endpoint_unavailable():
         return (500, response.headers, "")
 
-    session_id_header = request.headers.get("Sec-Session-Id")
+    session_id_header = request.headers.get("Sec-Secure-Session-Id")
     if session_id_header == None:
         return (400, response.headers, "")
     session_id_header = session_id_header.decode('utf-8')
@@ -29,10 +29,10 @@ def main(request, response):
 
     if test_session_manager.get_refresh_sends_challenge():
         challenge = "refresh_challenge_value"
-        if request.headers.get("Sec-Session-Response") == None:
-            return (401, [('Sec-Session-Challenge', f'"{challenge}";id="{session_id}"')], "")
+        if request.headers.get("Secure-Session-Response") == None:
+            return (403, [('Secure-Session-Challenge', f'"{challenge}";id="{session_id}"')], "")
 
-        jwt_header, jwt_payload, verified = jwt_helper.decode_jwt(request.headers.get("Sec-Session-Response").decode('utf-8'), session_key)
+        jwt_header, jwt_payload, verified = jwt_helper.decode_jwt(request.headers.get("Secure-Session-Response").decode('utf-8'), session_key)
 
         early_challenge = test_session_manager.get_early_challenge(session_id)
         if early_challenge is not None:
@@ -41,7 +41,4 @@ def main(request, response):
         if not verified or jwt_payload.get("jti") != challenge:
             return (400, response.headers, "")
 
-        if jwt_payload.get("sub") != session_id_header:
-            return (400, response.headers, "")
-
     return test_session_manager.get_session_instructions_response(session_id, request)
diff --git a/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html b/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html
deleted file mode 100644
index 525a45598be..00000000000
--- a/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="helper.js" type="module"></script>
-
-<script type="module">
-  import { expireCookie, waitForCookie, addCookieAndSessionCleanup, configureServer, setupShardedServerState, documentHasCookie } from "./helper.js";
-
-  promise_test(async t => {
-    await setupShardedServerState();
-    const expectedCookieAndValue = "auth_cookie=abcdef0123";
-    const expectedCookieAndAttributes = `${expectedCookieAndValue};Domain=${location.hostname};Path=/device-bound-session-credentials`;
-    addCookieAndSessionCleanup(t);
-
-    // Configure server to send back a challenge during registration.
-    await configureServer({ registrationSendsChallenge: true });
-
-    // Prompt starting a session, and wait until registration completes.
-    const loginResponse = await fetch('login.py');
-    assert_equals(loginResponse.status, 200);
-    await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
-
-    // Confirm that a request has the cookie set.
-    const authResponse = await fetch('verify_authenticated.py');
-    assert_equals(authResponse.status, 200);
-
-    // Confirm that expiring the cookie still leads to a request with the cookie set (refresh occurs).
-    expireCookie(expectedCookieAndAttributes);
-    assert_false(documentHasCookie(expectedCookieAndValue));
-    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterExpiry.status, 200);
-    assert_true(documentHasCookie(expectedCookieAndValue));
-}, "Registration can send back Sec-Session-Challenge");
-</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/device-bound-session-credentials/request_early_challenge.py b/tests/wpt/tests/device-bound-session-credentials/request_early_challenge.py
index f0cc5c75421..8b4c0f04a30 100644
--- a/tests/wpt/tests/device-bound-session-credentials/request_early_challenge.py
+++ b/tests/wpt/tests/device-bound-session-credentials/request_early_challenge.py
@@ -9,14 +9,24 @@ def main(request, response):
     if use_single_header is None:
         return (400, response.headers, "")
 
+    headers = []
+    if request.headers.get(b"origin") is not None:
+        # Some tests (e.g. third-party-registration.https.html) set
+        # challenges across origins. Allow cookies so that we can get
+        # the session_manager for the request.
+        headers = [
+            ("Access-Control-Allow-Origin", request.headers.get(b"origin")),
+            ("Access-Control-Allow-Credentials", "true"),
+        ]
+
     challenges = []
     for session_id in session_manager.find_for_request(request).get_session_ids():
         early_challenge = test_session_manager.get_early_challenge(session_id)
         if early_challenge is not None:
-            challenges.append(("Sec-Session-Challenge", f'"{early_challenge}";id="{session_id}"'))
+            challenges.append(("Secure-Session-Challenge", f'"{early_challenge}";id="{session_id}"'))
 
     if use_single_header:
-        combined_challenges = [("Sec-Session-Challenge", ", ".join([challenge[1] for challenge in challenges]))]
-        return (200, combined_challenges, "")
+        combined_challenges = [("Secure-Session-Challenge", ", ".join([challenge[1] for challenge in challenges]))]
+        return (200, headers + combined_challenges, "")
     else:
-        return (200, challenges, "")
+        return (200, headers + challenges, "")
diff --git a/tests/wpt/tests/device-bound-session-credentials/session_manager.py b/tests/wpt/tests/device-bound-session-credentials/session_manager.py
index 78ae558c461..8071d0d0591 100644
--- a/tests/wpt/tests/device-bound-session-credentials/session_manager.py
+++ b/tests/wpt/tests/device-bound-session-credentials/session_manager.py
@@ -51,6 +51,7 @@ class SessionManager:
         self.provider_url = None
         self.provider_key = None
         self.use_empty_response = False
+        self.registration_extra_cookies = []
 
     def next_session_id(self):
         return len(self.session_to_key_map)
@@ -152,6 +153,12 @@ class SessionManager:
         if use_empty_response is not None:
             self.use_empty_response = use_empty_response
 
+        registration_extra_cookies = configuration.get("registrationExtraCookies")
+        if registration_extra_cookies is not None:
+            self.registration_extra_cookies = []
+            for detail in registration_extra_cookies:
+                self.registration_extra_cookies.append(CookieDetail(detail.get("nameAndValue"), detail.get("attributes")))
+
     def get_should_refresh_end_session(self):
         return self.should_refresh_end_session
 
@@ -197,7 +204,7 @@ class SessionManager:
     def get_session_instructions_response_set_cookie_headers(self, session_id, request):
         header_values = list(map(
             lambda cookie_detail: f"{cookie_detail.get_name_and_value()}; {cookie_detail.get_attributes(request)}",
-            self.get_cookie_details(session_id)
+            self.get_cookie_details(session_id) + self.registration_extra_cookies
         ))
         return [("Set-Cookie", header_value) for header_value in header_values]
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html b/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
index f3e68506fb2..bd9db12f731 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
@@ -28,7 +28,7 @@
     expireCookie(expectedCookieAndAttributes);
     assert_false(documentHasCookie(expectedCookieAndValue));
     const authResponseAfterExpiry = await fetch('verify_authenticated.py');
-    assert_equals(authResponseAfterExpiry.status, expectRefresh ? 200 : 401);
+    assert_equals(authResponseAfterExpiry.status, expectRefresh ? 200 : 403);
     assert_equals(documentHasCookie(expectedCookieAndValue), expectRefresh);
   }
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html b/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
index b1d2452b53e..263317f5fbb 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
@@ -52,7 +52,7 @@
     async function expireCookieAndTriggerRequest(endpoint, expectRefresh) {
       expireCookie(expectedCookieAndAttributes);
       const authResponse = await fetch(endpoint, { credentials: "include" });
-      assert_equals(authResponse.status, expectRefresh ? 200 : 401);
+      assert_equals(authResponse.status, expectRefresh ? 200 : 403);
     }
 
     await expireCookieAndTriggerRequest("verify_authenticated.py", /*expectRefresh=*/false);
diff --git a/tests/wpt/tests/device-bound-session-credentials/start_session.py b/tests/wpt/tests/device-bound-session-credentials/start_session.py
index d2b7ee87818..7cf7730eb5b 100644
--- a/tests/wpt/tests/device-bound-session-credentials/start_session.py
+++ b/tests/wpt/tests/device-bound-session-credentials/start_session.py
@@ -7,11 +7,11 @@ def main(request, response):
     if test_session_manager.get_registration_sends_challenge():
         # Only send back a challenge on the first call.
         test_session_manager.reset_registration_sends_challenge()
-        return (401, [('Sec-Session-Challenge', '"login_challenge_value"')], "")
+        return (403, [('Secure-Session-Challenge', '"login_challenge_value"')], "")
 
-    jwt_header, jwt_payload, verified = jwt_helper.decode_jwt(request.headers.get("Sec-Session-Response").decode('utf-8'))
+    jwt_header, jwt_payload, verified = jwt_helper.decode_jwt(request.headers.get("Secure-Session-Response").decode('utf-8'))
     session_id = test_session_manager.create_new_session()
-    test_session_manager.set_session_key(session_id, jwt_payload.get('key'))
+    test_session_manager.set_session_key(session_id, jwt_header.get('jwk'))
 
     if not verified or jwt_payload.get("jti") != "login_challenge_value":
         return (400, response.headers, "")
diff --git a/tests/wpt/tests/device-bound-session-credentials/third-party-registration.https.html b/tests/wpt/tests/device-bound-session-credentials/third-party-registration.https.html
new file mode 100644
index 00000000000..ac7029b0b79
--- /dev/null
+++ b/tests/wpt/tests/device-bound-session-credentials/third-party-registration.https.html
@@ -0,0 +1,202 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="helper.js" type="module"></script>
+
+<script type="module">
+  import {
+    expireCookie,
+    documentHasCookie,
+    waitForCookie,
+    addCookieAndSessionCleanup,
+    setupShardedServerState,
+    configureServer,
+    crossSiteFetch
+  } from "./helper.js";
+
+  promise_test(async t => {
+    await setupShardedServerState({crossSite: true});
+    const expectedCookieAndValue = "auth_cookie=abcdef0123";
+    const expectedCookieAttributes = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=Lax`;
+    const expectedCookieAndAttributes = `${expectedCookieAndValue};${expectedCookieAttributes}`;
+    addCookieAndSessionCleanup(t);
+
+    configureServer({
+      // Set cookie details in order to specify that we should only bind a SameSite=Lax cookie for this test.
+      cookieDetails: [
+        {
+          nameAndValue: expectedCookieAndValue,
+          attributes: expectedCookieAttributes,
+        }
+      ],
+      // Since registration happens from a third-party context, we need
+      // a SameSite=None cookie to tell us that registration completed.
+      registrationExtraCookies: [
+        {
+          nameAndValue: "get_session_instructions=done",
+          attributes: "SameSite=None;Secure",
+        }
+      ]
+    });
+
+    // Prompt starting a session in a third-party context, and wait until registration completes.
+    const loginStatus = await crossSiteFetch(get_host_info().HTTPS_NOTSAMESITE_ORIGIN, `${location.protocol}//${location.host}/device-bound-session-credentials/login.py`, {credentials: "include"});
+    assert_equals(loginStatus, 200);
+    await waitForCookie("get_session_instructions=done", /*expectCookie=*/true);
+
+    // Since all cookies in the session are first-party, registration
+    // from a third-party context should fail.
+    expireCookie(expectedCookieAndAttributes);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 403);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+  }, "Registration of first-party session not allowed in third-party context");
+
+  promise_test(async t => {
+    await setupShardedServerState({crossSite: true});
+    const expectedCookieAndValueSameSiteLax = "auth_cookie_lax=abcdef0123";
+    const expectedCookieAttributesSameSiteLax = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=Lax`;
+    const expectedCookieAndAttributesSameSiteLax = `${expectedCookieAndValueSameSiteLax};${expectedCookieAttributesSameSiteLax}`;
+
+    const expectedCookieAndValueSameSiteNone = "auth_cookie=abcdef0123";
+    const expectedCookieAttributesSameSiteNone = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=None;Secure`;
+    const expectedCookieAndAttributesSameSiteNone = `${expectedCookieAndValueSameSiteNone};${expectedCookieAttributesSameSiteNone}`;
+    addCookieAndSessionCleanup(t);
+
+    configureServer({
+      // Configure the server to bind both a SameSite=Lax and SameSite=None cookie
+      cookieDetails: [
+        {
+          nameAndValue: expectedCookieAndValueSameSiteLax,
+          attributes: expectedCookieAttributesSameSiteLax,
+        },
+        {
+          nameAndValue: expectedCookieAndValueSameSiteNone,
+          attributes: expectedCookieAttributesSameSiteNone,
+        }
+      ],
+      // Since registration happens from a third-party context, we need
+      // a SameSite=None cookie to tell us that registration completed.
+      registrationExtraCookies: [
+        {
+          nameAndValue: "get_session_instructions=done",
+          attributes: "SameSite=None;Secure",
+        }
+      ]
+    });
+
+    // Prompt starting a session in a third-party context, and wait until registration completes.
+    const loginStatus = await crossSiteFetch(get_host_info().HTTPS_NOTSAMESITE_ORIGIN, `${location.protocol}//${location.host}/device-bound-session-credentials/login.py`, {credentials: "include"});
+    assert_equals(loginStatus, 200);
+    await waitForCookie("get_session_instructions=done", /*expectCookie=*/true);
+    // Because registration is happenin from a third-party context, only the
+    // SameSite=None cookie will be set.
+    assert_false(documentHasCookie(expectedCookieAndValueSameSiteLax));
+    assert_true(documentHasCookie(expectedCookieAndValueSameSiteNone));
+
+    // Since one cookies in the session is third-party, registration
+    // from a third-party context should succeed.
+    expireCookie(expectedCookieAndAttributesSameSiteLax);
+    expireCookie(expectedCookieAndAttributesSameSiteNone);
+    assert_false(documentHasCookie(expectedCookieAndValueSameSiteLax));
+    assert_false(documentHasCookie(expectedCookieAndValueSameSiteNone));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 200);
+    // While the registration was from a third-party context, the
+    // refresh triggered by fetching verify_authenticated.py is
+    // happening in a first-party context. So we get both cookies from
+    // the refresh.
+    assert_true(documentHasCookie(expectedCookieAndValueSameSiteLax));
+    assert_true(documentHasCookie(expectedCookieAndValueSameSiteNone));
+  }, "Registration of session with third-party cookies allowed in third-party context");
+
+  promise_test(async t => {
+    await setupShardedServerState({crossSite: true});
+    const expectedCookieAndValue = "auth_cookie=abcdef0123";
+    const expectedCookieAttributes = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=Lax`;
+    const expectedCookieAndAttributes = `${expectedCookieAndValue};${expectedCookieAttributes}`;
+    addCookieAndSessionCleanup(t);
+
+    configureServer({
+      // Set cookie details in order to specify that we should only bind a SameSite=Lax cookie for this test.
+      cookieDetails: [
+        {
+          nameAndValue: expectedCookieAndValue,
+          attributes: expectedCookieAttributes,
+        },
+      ],
+      earlyChallengeForNextRegisteredSession: "early_challenge",
+    });
+
+    // Prompt starting a session in a first-party context, and wait until registration completes.
+    const loginResponse = await fetch('login.py');
+    assert_equals(loginResponse.status, 200);
+    await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
+
+    // Try to set the challenge from a third-party context
+    const challengeStatus = await crossSiteFetch(get_host_info().HTTPS_NOTSAMESITE_ORIGIN, `${location.protocol}//${location.host}/device-bound-session-credentials/request_early_challenge.py`, {method: 'POST', body: JSON.stringify({ useSingleHeader: true}), credentials: "include"});
+    assert_equals(challengeStatus, 200);
+
+    // Since all cookies in the session are first-party, our attempt to
+    // set a challenge from a third-party context should fail. This
+    // causes a challenge mismatch at registration time.
+    expireCookie(expectedCookieAndAttributes);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 403);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+  }, "Set challenge of first-party not allowed in third-party context");
+
+  promise_test(async t => {
+    await setupShardedServerState({crossSite: true});
+    const expectedCookieAndValueSameSiteLax = "auth_cookie_lax=abcdef0123";
+    const expectedCookieAttributesSameSiteLax = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=Lax`;
+    const expectedCookieAndAttributesSameSiteLax = `${expectedCookieAndValueSameSiteLax};${expectedCookieAttributesSameSiteLax}`;
+
+    const expectedCookieAndValueSameSiteNone = "auth_cookie=abcdef0123";
+    const expectedCookieAttributesSameSiteNone = `Domain=${location.hostname};Path=/device-bound-session-credentials;SameSite=None;Secure`;
+    const expectedCookieAndAttributesSameSiteNone = `${expectedCookieAndValueSameSiteNone};${expectedCookieAttributesSameSiteNone}`;
+    addCookieAndSessionCleanup(t);
+
+    configureServer({
+      // Configure the server to bind both a SameSite=Lax and SameSite=None cookie
+      cookieDetails: [
+        {
+          nameAndValue: expectedCookieAndValueSameSiteLax,
+          attributes: expectedCookieAttributesSameSiteLax,
+        },
+        {
+          nameAndValue: expectedCookieAndValueSameSiteNone,
+          attributes: expectedCookieAttributesSameSiteNone,
+        }
+      ],
+      earlyChallengeForNextRegisteredSession: "early_challenge",
+    });
+
+    // Prompt starting a session in a first-party context, and wait until registration completes.
+    const loginResponse = await fetch('login.py');
+    assert_equals(loginResponse.status, 200);
+    await waitForCookie(expectedCookieAndValueSameSiteNone, /*expectCookie=*/true);
+
+    // Try to set the challenge from a third-party context
+    const challengeStatus = await crossSiteFetch(get_host_info().HTTPS_NOTSAMESITE_ORIGIN, `${location.protocol}//${location.host}/device-bound-session-credentials/request_early_challenge.py`, {method: 'POST', body: JSON.stringify({ useSingleHeader: true}), credentials: "include"});
+    assert_equals(challengeStatus, 200);
+
+    // Since one cookie in the session is third-party, our attempt to
+    // set a challenge from a third-party context should succeed.
+    expireCookie(expectedCookieAndAttributesSameSiteLax);
+    expireCookie(expectedCookieAndAttributesSameSiteNone);
+    assert_false(documentHasCookie(expectedCookieAndValueSameSiteLax));
+    assert_false(documentHasCookie(expectedCookieAndValueSameSiteNone));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 200);
+    // While the challenge was set in a third-party context, the refresh
+    // triggered by fetching verify_authenticated.py is happening in a
+    // first-party context. So we get both cookies from the refresh.
+    assert_true(documentHasCookie(expectedCookieAndValueSameSiteLax));
+    assert_true(documentHasCookie(expectedCookieAndValueSameSiteNone));
+  }, "Set challenge of session with third-party cookies allowed in third-party context");
+</script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/url_fetcher.html b/tests/wpt/tests/device-bound-session-credentials/url_fetcher.html
index be1cb979219..e18c0b5be81 100644
--- a/tests/wpt/tests/device-bound-session-credentials/url_fetcher.html
+++ b/tests/wpt/tests/device-bound-session-credentials/url_fetcher.html
@@ -5,7 +5,8 @@
     'use strict';
 
     window.addEventListener("message", async (event) => {
-      const response = await fetch(event.data, {credentials: "include"});
+      const req = event.data;
+      const response = await fetch(req.url, req.fetchParams);
       event.source.postMessage(response.status, "*");
     });
   </script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/verify_authenticated_util.py b/tests/wpt/tests/device-bound-session-credentials/verify_authenticated_util.py
index e9bbb74793e..79f5cb81c09 100644
--- a/tests/wpt/tests/device-bound-session-credentials/verify_authenticated_util.py
+++ b/tests/wpt/tests/device-bound-session-credentials/verify_authenticated_util.py
@@ -12,5 +12,5 @@ def verify_authenticated(request, response):
 
     cookie = request.cookies.get(expected_name)
     if cookie == None or cookie.value != expected_value:
-        return (401, headers, "")
+        return (403, headers, "")
     return (200, headers, "")
diff --git a/tests/wpt/tests/docs/writing-tests/testdriver.md b/tests/wpt/tests/docs/writing-tests/testdriver.md
index ce5aa6af545..e3f0ba3ea40 100644
--- a/tests/wpt/tests/docs/writing-tests/testdriver.md
+++ b/tests/wpt/tests/docs/writing-tests/testdriver.md
@@ -192,6 +192,14 @@ the global scope.
 .. js:autofunction:: test_driver.clear_display_features
 ```
 
+### Global Privacy Control ###
+
+```eval_rst
+.. js:autofunction:: test_driver.set_global_privacy_control
+.. js:autofunction:: test_driver.set_global_privacy_control
+```
+
+
 ### Using test_driver in other browsing contexts ###
 
 Testdriver can be used in browsing contexts (i.e. windows or frames)
diff --git a/tests/wpt/tests/editing/data/delete.js b/tests/wpt/tests/editing/data/delete.js
index 7e0bb2df979..9f241c72f42 100644
--- a/tests/wpt/tests/editing/data/delete.js
+++ b/tests/wpt/tests/editing/data/delete.js
@@ -3134,6 +3134,8 @@ var browserTests = [
     "<div>abc</div><div><br></div>",
     [true],
     {}],
+
+// These flex item cases are based on web-compat issue on Slack.
 ["<div style=display:flex><span>{abc</span><span>def</span>}</div>",
     [["delete",""]],
     "<div style=\"display:flex\"><span><br></span></div>",
@@ -3144,6 +3146,7 @@ var browserTests = [
     "<div style=\"display:flex\"><span>abc</span><span><br></span></div>",
     [true],
     {}],
+
 ["<div style=display:grid><span>{abc</span><span>def</span>}</div>",
     [["delete",""]],
     "<div style=\"display:grid\"><span><br></span></div>",
@@ -3154,6 +3157,7 @@ var browserTests = [
     "<div style=\"display:grid\"><span>abc</span><span><br></span></div>",
     [true],
     {}],
+
 // Do not delete non-editable when deleting an editable character
 ["<b>X[]<span contenteditable=false>abc</span></b><i>def</i>",
     [["delete",""]],
@@ -3203,4 +3207,190 @@ var browserTests = [
     "<table><tbody><tr><th>a</th><th><br></th><th><br></th><th><br></th><th>e</th></tr></tbody></table>",
     [true],
     {}],
+
+// The expectations of these flex item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:flex><span>abc</span><span>[]def</span></div>",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>[]def</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def</span></div>[]ghi",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def</span></div>[]ghi",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def</span></div><div>[]ghi</div>",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def</span></div><div>[]ghi</div>",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["012<div style=display:flex><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "012abc<div style=\"display:flex\"><span>def</span></div>",
+    [true],
+    {}],
+["012<div style=display:inline-flex><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "012abc<div style=\"display:inline-flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012</div><div style=display:flex><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "<div>012abc</div><div style=\"display:flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012</div><div style=display:inline-flex><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "<div>012abc</div><div style=\"display:inline-flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def</span></div><div style=display:flex><span>[]ghi</span><span>jkl</span></div>",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div><div style=\"display:flex\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def</span></div><div style=display:inline-flex><span>[]ghi</span><span>jkl</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div><div style=\"display:inline-flex\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def</span></div><div style=display:flex><span>[]ghi</span></div>",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def</span></div><div style=display:inline-flex><span>[]ghi</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:flex><span>{}<br></span></div>",
+    [["delete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:inline-flex><span>{}<br></span></div>",
+    [["delete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div style=display:flex><span>{}<br></span></div><div>abc</div>",
+    [["delete",""]],
+    "<div style=\"display:flex\"><span>{}<br></span></div><div>abc</div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>{}<br></span></div><div>abc</div>",
+    [["delete",""]],
+    "<div style=\"display:inline-flex\"><span>{}<br></span></div><div>abc</div>",
+    [true],
+    {}],
+
+// The expectations of these grid item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:grid><span>abc</span><span>[]def</span></div>",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>[]def</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def</span></div>[]ghi",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def</span></div>[]ghi",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def</span></div><div>[]ghi</div>",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def</span></div><div>[]ghi</div>",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["012<div style=display:grid><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "012abc<div style=\"display:grid\"><span>def</span></div>",
+    [true],
+    {}],
+["012<div style=display:inline-grid><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "012abc<div style=\"display:inline-grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012</div><div style=display:grid><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "<div>012abc</div><div style=\"display:grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012</div><div style=display:inline-grid><span>[]abc</span><span>def</span></div>",
+    [["delete",""]],
+    "<div>012abc</div><div style=\"display:inline-grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def</span></div><div style=display:grid><span>[]ghi</span><span>jkl</span></div>",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div><div style=\"display:grid\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def</span></div><div style=display:inline-grid><span>[]ghi</span><span>jkl</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div><div style=\"display:inline-grid\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def</span></div><div style=display:grid><span>[]ghi</span></div>",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def</span></div><div style=display:inline-grid><span>[]ghi</span></div>",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:grid><span>{}<br></span></div>",
+    [["delete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:inline-grid><span>{}<br></span></div>",
+    [["delete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div style=display:grid><span>{}<br></span></div><div>abc</div>",
+    [["delete",""]],
+    "<div style=\"display:grid\"><span>{}<br></span></div><div>abc</div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>{}<br></span></div><div>abc</div>",
+    [["delete",""]],
+    "<div style=\"display:inline-grid\"><span>{}<br></span></div><div>abc</div>",
+    [true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/data/forwarddelete.js b/tests/wpt/tests/editing/data/forwarddelete.js
index 8dcf761db17..829a56b24d7 100644
--- a/tests/wpt/tests/editing/data/forwarddelete.js
+++ b/tests/wpt/tests/editing/data/forwarddelete.js
@@ -2996,6 +2996,8 @@ var browserTests = [
     "<div>abc</div><div><br></div>",
     [true],
     {}],
+
+// These flex item cases are based on web-compat issue on Slack.
 ["<div style=display:flex><span>{abc</span><span>def</span>}</div>",
     [["forwarddelete",""]],
     "<div style=\"display:flex\"><span><br></span></div>",
@@ -3006,6 +3008,7 @@ var browserTests = [
     "<div style=\"display:flex\"><span>abc</span><span><br></span></div>",
     [true],
     {}],
+
 ["<div style=display:grid><span>{abc</span><span>def</span>}</div>",
     [["forwarddelete",""]],
     "<div style=\"display:grid\"><span><br></span></div>",
@@ -3016,6 +3019,7 @@ var browserTests = [
     "<div style=\"display:grid\"><span>abc</span><span><br></span></div>",
     [true],
     {}],
+
 // Do not delete non-editable when deleting an editable character
 ["<b>[]X<span contenteditable=false>abc</span></b><i>def</i>",
     [["forwarddelete",""]],
@@ -3065,4 +3069,190 @@ var browserTests = [
     "<table><tbody><tr><th>a</th><th><br></th><th><br></th><th><br></th><th>e</th></tr></tbody></table>",
     [true],
     {}],
+
+// The expectations of these flex item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:flex><span>abc[]</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:flex\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc[]</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-flex\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def[]</span></div>ghi",
+    [["forwarddelete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def[]</span></div>ghi",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def[]</span></div><div>ghi</div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def[]</span></div><div>ghi</div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["012[]<div style=display:flex><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "012abc<div style=\"display:flex\"><span>def</span></div>",
+    [true],
+    {}],
+["012[]<div style=display:inline-flex><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "012abc<div style=\"display:inline-flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012[]</div><div style=display:flex><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div>012abc</div><div style=\"display:flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012[]</div><div style=display:inline-flex><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div>012abc</div><div style=\"display:inline-flex\"><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def[]</span></div><div style=display:flex><span>ghi</span><span>jkl</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div><div style=\"display:flex\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def[]</span></div><div style=display:inline-flex><span>ghi</span><span>jkl</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div><div style=\"display:inline-flex\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def[]</span></div><div style=display:flex><span>ghi</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def[]</span></div><div style=display:inline-flex><span>ghi</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>{}<br></span></div><div>abc</div>",
+    [["forwarddelete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>{}<br></span></div><div>abc</div>",
+    [["forwarddelete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:flex><span>{}<br></span></div>",
+    [["forwarddelete",""]],
+    "<div>abc</div><div style=\"display:flex\"><span><br></span></div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:inline-flex><span>{}<br></span></div>",
+    [["forwarddelete",""]],
+    "<div>abc</div><div style=\"display:inline-flex\"><span><br></span></div>",
+    [true],
+    {}],
+
+// The expectations of these grid item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:grid><span>abc[]</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:grid\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc[]</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-grid\"><span>abcdef</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def[]</span></div>ghi",
+    [["forwarddelete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def[]</span></div>ghi",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def[]</span></div><div>ghi</div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def[]</span></div><div>ghi</div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["012[]<div style=display:grid><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "012abc<div style=\"display:grid\"><span>def</span></div>",
+    [true],
+    {}],
+["012[]<div style=display:inline-grid><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "012abc<div style=\"display:inline-grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012[]</div><div style=display:grid><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div>012abc</div><div style=\"display:grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div>012[]</div><div style=display:inline-grid><span>abc</span><span>def</span></div>",
+    [["forwarddelete",""]],
+    "<div>012abc</div><div style=\"display:inline-grid\"><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def[]</span></div><div style=display:grid><span>ghi</span><span>jkl</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div><div style=\"display:grid\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def[]</span></div><div style=display:inline-grid><span>ghi</span><span>jkl</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div><div style=\"display:inline-grid\"><span>jkl</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def[]</span></div><div style=display:grid><span>ghi</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def[]</span></div><div style=display:inline-grid><span>ghi</span></div>",
+    [["forwarddelete",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>defghi</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>{}<br></span></div><div>abc</div>",
+    [["forwarddelete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>{}<br></span></div><div>abc</div>",
+    [["forwarddelete",""]],
+    "<div>abc</div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:grid><span>{}<br></span></div>",
+    [["forwarddelete",""]],
+    "<div>abc</div><div style=\"display:grid\"><span><br></span></div>",
+    [true],
+    {}],
+["<div>abc</div><div style=display:inline-grid><span>{}<br></span></div>",
+    [["forwarddelete",""]],
+    "<div>abc</div><div style=\"display:inline-grid\"><span><br></span></div>",
+    [true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/data/insertlinebreak.js b/tests/wpt/tests/editing/data/insertlinebreak.js
index 36a15e0ae93..b26ecccba96 100644
--- a/tests/wpt/tests/editing/data/insertlinebreak.js
+++ b/tests/wpt/tests/editing/data/insertlinebreak.js
@@ -869,4 +869,130 @@ var browserTests = [
      "<div><br>  abc</div>"],
     [true,true],
     {"insertlinebreak":[false,false,"",false,false,""]}],
+
+// The expectations of these flex item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:flex><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex\"><span><br>abc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex\"><span><br>abc</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex\"><span>a<br>bc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex\"><span>a<br>bc</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex\"><span>abc<br><br></span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex\"><span>abc<br><br></span></div>",
+    [true],
+    {}],
+["<div style=display:flex;white-space:pre><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex;white-space:pre\"><span>\nabc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex;white-space:pre><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex;white-space:pre\"><span>\nabc</span></div>",
+    [true],
+    {}],
+["<div style=display:flex;white-space:pre><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex;white-space:pre\"><span>a\nbc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex;white-space:pre><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex;white-space:pre\"><span>a\nbc</span></div>",
+    [true],
+    {}],
+["<div style=display:flex;white-space:pre><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:flex;white-space:pre\"><span>abc\n<br></span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex;white-space:pre><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-flex;white-space:pre\"><span>abc\n<br></span></div>",
+    [true],
+    {}],
+
+// The expectations of these grid item scenarios based on Chrome 142 except
+// in some cases.  Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:grid><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid\"><span><br>abc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid\"><span><br>abc</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid\"><span>a<br>bc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid\"><span>a<br>bc</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid\"><span>abc<br><br></span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid\"><span>abc<br><br></span></div>",
+    [true],
+    {}],
+["<div style=display:grid;white-space:pre><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid;white-space:pre\"><span>\nabc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid;white-space:pre><span>[]abc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid;white-space:pre\"><span>\nabc</span></div>",
+    [true],
+    {}],
+["<div style=display:grid;white-space:pre><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid;white-space:pre\"><span>a\nbc</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid;white-space:pre><span>a[]bc</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid;white-space:pre\"><span>a\nbc</span></div>",
+    [true],
+    {}],
+["<div style=display:grid;white-space:pre><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:grid;white-space:pre\"><span>abc\n<br></span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid;white-space:pre><span>abc[]</span></div>",
+    [["insertlinebreak",""]],
+    "<div style=\"display:inline-grid;white-space:pre\"><span>abc\n<br></span></div>",
+    [true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/data/insertparagraph.js b/tests/wpt/tests/editing/data/insertparagraph.js
index 6583152e177..a32921bcd61 100644
--- a/tests/wpt/tests/editing/data/insertparagraph.js
+++ b/tests/wpt/tests/editing/data/insertparagraph.js
@@ -2577,4 +2577,130 @@ var browserTests = [
      "<p><br></p><p><br></p><span style=\"display:block\">abc<br>def<br></span>"],
     [true,true],
     {}],
+
+// The expectations of these flex item scenarios based on Chrome 142.
+// Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:flex><span>[]abc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:flex><span>[]abc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>[]abc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>[]abc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:flex><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:flex><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:flex><span>abc[]</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:flex><span>abc[]</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:flex\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>abc[]</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-flex><span>abc[]</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+
+// The expectations of these grid item scenarios based on Chrome 142.
+// Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:grid><span>[]abc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:grid><span>[]abc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>[]abc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>[]abc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span><br></span><span>abc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:grid><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:grid><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>a[]bc</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span>a</span><span>bc</span></div>",
+    [true,true],
+    {}],
+["<div style=display:grid><span>abc[]</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:grid><span>abc[]</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:grid\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>abc[]</span></div>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
+["<div style=display:inline-grid><span>abc[]</span></div>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span><br></span></div>",
+    [true,true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/data/inserttext.js b/tests/wpt/tests/editing/data/inserttext.js
index 31e81f2a81a..d19ccfda9b4 100644
--- a/tests/wpt/tests/editing/data/inserttext.js
+++ b/tests/wpt/tests/editing/data/inserttext.js
@@ -1541,4 +1541,90 @@ var browserTests = [
     "<table><tbody><tr><th>a</th><th><b>B</b></th><th><br></th><th><br></th><th>e</th></tr></tbody></table>",
     [true],
     {}],
+
+// The expectations of these flex item scenarios based on Chrome 142.
+// Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:flex><span>[]abc</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:flex\"><span>&nbsp;abc</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>[]abc</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-flex\"><span>&nbsp;abc</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc[]</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:flex\"><span>abc&nbsp;</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc[]</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-flex\"><span>abc&nbsp;</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>[]def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:flex\"><span>abc</span><span>&nbsp;def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>[]def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>&nbsp;def</span></div>",
+    [true],
+    {}],
+["<div style=display:flex><span>abc</span><span>def[]</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:flex\"><span>abc</span><span>def&nbsp;</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-flex><span>abc</span><span>def[]</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-flex\"><span>abc</span><span>def&nbsp;</span></div>",
+    [true],
+    {}],
+
+// The expectations of these grid item scenarios based on Chrome 142.
+// Feel free to change them if it's discussed in the Editing WG.
+["<div style=display:grid><span>[]abc</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:grid\"><span>&nbsp;abc</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>[]abc</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-grid\"><span>&nbsp;abc</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc[]</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:grid\"><span>abc&nbsp;</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc[]</span><span>def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-grid\"><span>abc&nbsp;</span><span>def</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>[]def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:grid\"><span>abc</span><span>&nbsp;def</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>[]def</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>&nbsp;def</span></div>",
+    [true],
+    {}],
+["<div style=display:grid><span>abc</span><span>def[]</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:grid\"><span>abc</span><span>def&nbsp;</span></div>",
+    [true],
+    {}],
+["<div style=display:inline-grid><span>abc</span><span>def[]</span></div>",
+    [["inserttext"," "]],
+    "<div style=\"display:inline-grid\"><span>abc</span><span>def&nbsp;</span></div>",
+    [true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/edit-context/edit-context-textformat.tentative.html b/tests/wpt/tests/editing/edit-context/edit-context-textformat.tentative.html
new file mode 100644
index 00000000000..d16ea29fdfb
--- /dev/null
+++ b/tests/wpt/tests/editing/edit-context/edit-context-textformat.tentative.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>EditContext: The TextFormat property</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+  test(function() {
+    const textFormat = new TextFormat();
+
+    assert_equals(textFormat.rangeStart, 0);
+    assert_equals(textFormat.rangeEnd, 0);
+    assert_equals(textFormat.underlineStyle, "none");
+    assert_equals(textFormat.underlineThickness, "none");
+  }, 'Test default values of TextFormat attributes');
+
+  test(function(){
+    const validUnderlineStyles = ["none", "solid", "dotted", "dashed", "wavy"];
+    const validUnderlineThicknesses = ["none", "thin", "thick"];
+
+    // Invalid value should throw type error.
+    assert_throws_js(TypeError, function() {
+      const textFormat = new TextFormat({underlineStyle: "Solid"});
+    }, 'TextFormat must throw a TypeError when underlineStyle is set to an invalid value');
+    assert_throws_js(TypeError, function() {
+      const textFormat = new TextFormat({underlineThickness: "Thick"});
+    }, 'TextFormat must throw a TypeError when underlineThickness is set to an invalid value');
+
+    // Verify valid values.
+    for (const style of validUnderlineStyles) {
+      const textFormat = new TextFormat({underlineStyle: style});
+      assert_equals(textFormat.underlineStyle, style, `underlineStyle should accept "${style}"`);
+      assert_equals(textFormat.underlineThickness, "none", 'default value of underlineThickness should be "none"');
+    }
+    for (const thickness of validUnderlineThicknesses) {
+      const textFormat = new TextFormat({underlineThickness: thickness});
+      assert_equals(textFormat.underlineStyle, "none", 'default value of underlineStyle should be "none"');
+      assert_equals(textFormat.underlineThickness, thickness, `underlineThickness should accept "${thickness}"`);
+    }
+  }, 'Test valid values of TextFormat underlineStyle and underlineThickness');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/editing/run/insertlinebreak.html b/tests/wpt/tests/editing/run/insertlinebreak.html
index 4ca86b8b5f8..40929fff5d3 100644
--- a/tests/wpt/tests/editing/run/insertlinebreak.html
+++ b/tests/wpt/tests/editing/run/insertlinebreak.html
@@ -1,6 +1,8 @@
 <!doctype html>
 <meta charset=utf-8>
 <meta name="timeout" content="long">
+<meta name="variant" content="?1-1000">
+<meta name="variant" content="?1001-last">
 <link rel=stylesheet href=../include/reset.css>
 <title>insertlinebreak - HTML editing conformance tests</title>
 
diff --git a/tests/wpt/tests/fedcm/fedcm-error-attribute/fedcm-error-attribute.https.html b/tests/wpt/tests/fedcm/fedcm-error-attribute/fedcm-error-attribute.https.html
new file mode 100644
index 00000000000..ee53bda6fc4
--- /dev/null
+++ b/tests/wpt/tests/fedcm/fedcm-error-attribute/fedcm-error-attribute.https.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<title>FedCM IdentityCredentialError.error attribute</title>
+<meta name="timeout" content="long">
+<link rel="help" href="https://fedidcg.github.io/FedCM">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script type="module">
+import {request_options_with_mediation_required,
+        fedcm_test,
+        select_manifest,
+        fedcm_get_and_select_first_account,
+        fedcm_error_dialog_click_button,
+        fedcm_error_dialog_dismiss} from '../support/fedcm-helper.sub.js';
+
+test(() => {
+  const errorInit = {
+    error: "invalid_request",
+    url: "https://example.com/error"
+  };
+
+  const error = new IdentityCredentialError("Test error", errorInit);
+
+  assert_equals(error.error, "invalid_request", "error attribute should work");
+  assert_equals(error.url, "https://example.com/error", "url should work");
+}, 'IdentityCredentialError.error attribute works');
+
+test(() => {
+  const errorInit = {
+    code: "unauthorized_client",
+    url: "https://example.com/error"
+  };
+
+  const error = new IdentityCredentialError("Test error", errorInit);
+
+  // error attribute should be empty because code was ignored
+  assert_equals(error.error, "", "error should be empty when only code is provided and flag is enabled");
+  assert_equals(error.url, "https://example.com/error", "url should work");
+}, 'Constructor ignores code field');
+
+// Error attribute in FedCM flow - dialog dismiss
+fedcm_test(async t => {
+  let test_options =
+    request_options_with_mediation_required("manifest_id_assertion_endpoint_returns_error_format.json");
+  await select_manifest(t, test_options);
+
+  try {
+    const cred = fedcm_get_and_select_first_account(t, test_options);
+    fedcm_error_dialog_dismiss(t);
+    await cred;
+    assert_unreached("IdentityCredentialError should be thrown");
+  } catch (e) {
+    assert_equals(e.name, "IdentityCredentialError");
+    assert_equals(e.error, "unauthorized_client", "error attribute works in FedCM flow");
+  }
+}, 'error attribute works in dialog dismiss workflow');
+
+// Error attribute in FedCM flow - button click
+fedcm_test(async t => {
+  let test_options = request_options_with_mediation_required("manifest_id_assertion_endpoint_returns_error_format.json");
+  await select_manifest(t, test_options);
+
+  try {
+    const cred = fedcm_get_and_select_first_account(t, test_options);
+    fedcm_error_dialog_click_button(t, "ErrorGotIt");
+    await cred;
+    assert_unreached("IdentityCredentialError should be thrown");
+  } catch (e) {
+    assert_equals(e.name, "IdentityCredentialError");
+    assert_equals(e.error, "unauthorized_client", "error attribute works when button clicked");
+  }
+}, 'error attribute works in button click flow');
+
+</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/fedcm/fedcm-well-known-validation/well-known-client-metadata-validation.https.html b/tests/wpt/tests/fedcm/fedcm-well-known-validation/well-known-client-metadata-validation.https.html
new file mode 100644
index 00000000000..88cc2dd26f3
--- /dev/null
+++ b/tests/wpt/tests/fedcm/fedcm-well-known-validation/well-known-client-metadata-validation.https.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<title>FedCM Well-Known Client Metadata Validation</title>
+<meta name="timeout" content="long">
+<link rel="help" href="https://fedidcg.github.io/FedCM">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script type="module">
+import {fedcm_test,
+        set_well_known_format,
+        request_options_with_mediation_required,
+        select_manifest,
+        fedcm_get_and_select_first_account} from '../support/fedcm-helper.sub.js';
+
+// Test 1: Direct format(account_endpoint and login_url defined) should work with client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('direct');
+
+  const options = request_options_with_mediation_required();
+  const credential = await fedcm_get_and_select_first_account(t, options);
+  assert_equals(credential.token, "token", "Should get credential with token");
+}, 'FedCM should succeed with direct well-known format and client_metadata');
+
+// Test 2: Missing format(account_endpoint and login_url are empty) should fail with client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('missing');
+
+  const options = request_options_with_mediation_required();
+  return promise_rejects_dom(t, "NetworkError", navigator.credentials.get(options),
+    "Should fail when well-known has missing endpoints with client_metadata");
+}, 'FedCM should fail with missing well-known endpoints and client_metadata');
+
+// Test 3: Partial_accounts format(account_endpoint defined) should fail with client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('partial_accounts');
+
+  const options = request_options_with_mediation_required();
+  return promise_rejects_dom(t, "NetworkError", navigator.credentials.get(options),
+    "Should fail when well-known has only accounts_endpoint with client_metadata");
+}, 'FedCM should fail with partial accounts endpoint and client_metadata');
+
+// Test 4: Partial_login format(login_url defined) should fail with client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('partial_login');
+
+  const options = request_options_with_mediation_required();
+  return promise_rejects_dom(t, "NetworkError", navigator.credentials.get(options),
+    "Should fail when well-known has only login_url with client_metadata");
+}, 'FedCM should fail with partial login endpoint and client_metadata');
+
+// Test 5: Provider_urls format(provider_urls defined) should fail with client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('provider_urls');
+
+  const options = request_options_with_mediation_required();
+  return promise_rejects_dom(t, "NetworkError", navigator.credentials.get(options),
+    "Should fail when using provider_urls format with client_metadata");
+}, 'FedCM should fail with provider_urls format and client_metadata (validation enforced)');
+
+// Test 6: Missing format(account_endpoint and login_url are empty) should work without client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('missing');
+
+  const options = request_options_with_mediation_required("manifest_with_no_client_metadata.json");
+  await select_manifest(t, options);
+  const credential = await fedcm_get_and_select_first_account(t, options);
+  assert_equals(credential.token, "token", "Should get credential with token");
+}, 'FedCM should succeed with missing well-known endpoints without client_metadata');
+
+// Test 7: Empty format(account_endpoint and login_url entries doesnt exist) should work without client_metadata
+fedcm_test(async t => {
+  await set_well_known_format('empty');
+
+  const options = request_options_with_mediation_required("manifest_with_no_client_metadata.json");
+  await select_manifest(t, options);
+  const credential = await fedcm_get_and_select_first_account(t, options);
+  assert_equals(credential.token, "token", "Should get credential with token");
+}, 'FedCM should succeed with empty well-known endpoints without client_metadata');
+
+// Test 8: Default format (provider_urls) should work without client_metadata
+fedcm_test(async t => {
+  const options = request_options_with_mediation_required("manifest_with_no_client_metadata.json");
+  await select_manifest(t, options);
+  const credential = await fedcm_get_and_select_first_account(t, options);
+  assert_equals(credential.token, "token", "Should get credential with token");
+}, 'FedCM should succeed with provider_urls format without client_metadata (no validation)');
+
+</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/fedcm/support/error_with_error_and_url_format.py b/tests/wpt/tests/fedcm/support/error_with_error_and_url_format.py
new file mode 100644
index 00000000000..b2d4e50a438
--- /dev/null
+++ b/tests/wpt/tests/fedcm/support/error_with_error_and_url_format.py
@@ -0,0 +1,12 @@
+import importlib
+error_checker = importlib.import_module("fedcm.support.request-params-check")
+
+def main(request, response):
+  request_error = error_checker.tokenCheck(request)
+  if (request_error):
+    return request_error
+
+  response.headers.set(b"Content-Type", b"application/json")
+  response.status = (401, b"Unauthorized")
+
+  return "{\"error\": {\"error\": \"unauthorized_client\", \"url\": \"error.html\"}}"
diff --git a/tests/wpt/tests/fedcm/support/fedcm-helper.sub.js b/tests/wpt/tests/fedcm/support/fedcm-helper.sub.js
index 915eed6f226..0d0a41c8daf 100644
--- a/tests/wpt/tests/fedcm/support/fedcm-helper.sub.js
+++ b/tests/wpt/tests/fedcm/support/fedcm-helper.sub.js
@@ -364,3 +364,14 @@ export async function fedcm_get_flexible_tokens_credential(t, type) {
   await select_manifest(t, options);
   return await fedcm_get_and_select_first_account(t, options);
 }
+
+export function set_well_known_format(format_type) {
+  const url_query = `?format=${encodeURIComponent(format_type)}`;
+
+  return new Promise(resolve => {
+    const img = document.createElement('img');
+    img.addEventListener('error', resolve);
+    img.src = `/fedcm/support/set-well-known-format.py${url_query}`;
+    document.body.appendChild(img);
+  });
+}
\ No newline at end of file
diff --git a/tests/wpt/tests/fedcm/support/keys.py b/tests/wpt/tests/fedcm/support/keys.py
index 8ced364116b..b69f01a0ad7 100644
--- a/tests/wpt/tests/fedcm/support/keys.py
+++ b/tests/wpt/tests/fedcm/support/keys.py
@@ -2,3 +2,4 @@ CLIENT_METADATA_COUNTER_KEY = b"bdc14e3e-b8bc-44a1-8eec-78da5fdacbc3"
 MANIFEST_URL_IN_MANIFEST_LIST_KEY = b"7f3f7478-b7f0-41c5-b357-f3ac16f5f25a"
 ACCOUNT_PICTURE_COUNTER_KEY = b"9dca7d23-149d-4a21-8eda-851329365d10"
 ACCOUNT_PICTURE_UNCACHED_COUNTER_KEY = b"ee1a8abc-f656-4f6b-a14f-d63670ff031b"
+WELL_KNOWN_FORMAT_KEY = b"a1b2c3d4-e5f6-7890-1234-56789abcdef0"
\ No newline at end of file
diff --git a/tests/wpt/tests/fedcm/support/manifest_id_assertion_endpoint_returns_error_format.json b/tests/wpt/tests/fedcm/support/manifest_id_assertion_endpoint_returns_error_format.json
new file mode 100644
index 00000000000..438269e8e40
--- /dev/null
+++ b/tests/wpt/tests/fedcm/support/manifest_id_assertion_endpoint_returns_error_format.json
@@ -0,0 +1,6 @@
+{
+  "accounts_endpoint": "accounts.py",
+  "client_metadata_endpoint": "client_metadata.py",
+  "id_assertion_endpoint": "error_with_error_and_url_format.py",
+  "login_url": "login.html"
+}
diff --git a/tests/wpt/tests/fedcm/support/manifest_with_no_client_metadata.json b/tests/wpt/tests/fedcm/support/manifest_with_no_client_metadata.json
new file mode 100644
index 00000000000..4e452dfd584
--- /dev/null
+++ b/tests/wpt/tests/fedcm/support/manifest_with_no_client_metadata.json
@@ -0,0 +1,6 @@
+{
+  "accounts_endpoint": "accounts.py",
+  "id_assertion_endpoint": "token.py",
+  "disconnect_endpoint": "disconnect.py",
+  "login_url": "login.html"
+}
diff --git a/tests/wpt/tests/fedcm/support/set-well-known-format.py b/tests/wpt/tests/fedcm/support/set-well-known-format.py
new file mode 100644
index 00000000000..fe13300df2d
--- /dev/null
+++ b/tests/wpt/tests/fedcm/support/set-well-known-format.py
@@ -0,0 +1,14 @@
+import importlib
+keys = importlib.import_module("fedcm.support.keys")
+
+def main(request, response):
+  format_type = request.GET.first(b"format", b"default")
+
+  namespace = "/.well-known/web-identity"
+
+  # Clear any existing value first
+  request.server.stash.take(keys.WELL_KNOWN_FORMAT_KEY, namespace)
+
+  request.server.stash.put(keys.WELL_KNOWN_FORMAT_KEY, format_type, namespace)
+
+  return namespace
\ No newline at end of file
diff --git a/tests/wpt/tests/focus/anchor-remove-href.html b/tests/wpt/tests/focus/anchor-remove-href.html
new file mode 100644
index 00000000000..25ace9ff67f
--- /dev/null
+++ b/tests/wpt/tests/focus/anchor-remove-href.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://issues.chromium.org/issues/443585794">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<a href="#">anchor tag</a>
+
+<script>
+promise_test(async () => {
+  const anchor = document.querySelector('a');
+  anchor.focus();
+  assert_equals(document.activeElement, anchor,
+    'anchor should be focused at the start of the test.');
+
+  anchor.removeAttribute('href');
+  anchor.setAttribute('tabindex', '0');
+  assert_equals(document.activeElement, anchor,
+    'anchor should be focused after removing href.');
+
+  await new Promise(requestAnimationFrame);
+  await new Promise(requestAnimationFrame);
+
+  assert_equals(document.activeElement, anchor,
+    'anchor should still be focused after a double rAF.');
+}, 'anchor element should remain focused after removing href attribute.');
+</script>
diff --git a/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html b/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
index da0e539a4d9..0fcacdb4534 100644
--- a/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
+++ b/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
@@ -2,6 +2,7 @@
 <meta charset=utf-8>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
 <body>
 <script>
   // Check HSTS tracking prevention functionality that is common to all major
@@ -25,9 +26,12 @@
   //    since it is top level and also not third party it should pass for all
   //    the browsers.
 
-  const CURRENT_HOST_HTTP_PORT = "{{hosts[][]}}:{{ports[http][0]}}";
-  const CURRENT_HOST_HTTPS_PORT = "{{hosts[][]}}:{{ports[https][0]}}";
-  const ALTERNATE_HOST_HTTPS_PORT = "{{hosts[alt][]}}:{{ports[https][0]}}";
+  const CURRENT_HOST_HTTP_PORT = get_host_info().ORIGINAL_HOST +
+  get_host_info().HTTP_PORT_ELIDED;
+  const CURRENT_HOST_HTTPS_PORT = get_host_info().ORIGINAL_HOST +
+  get_host_info().HTTPS_PORT_ELIDED;
+  const ALTERNATE_HOST_HTTPS_PORT = get_host_info().NOTSAMESITE_HOST +
+  get_host_info().HTTPS_PORT_ELIDED;
 
   promise_test(async() => {
 
diff --git a/tests/wpt/tests/html/META.yml b/tests/wpt/tests/html/META.yml
index 7eecf519f1b..ab22308411e 100644
--- a/tests/wpt/tests/html/META.yml
+++ b/tests/wpt/tests/html/META.yml
@@ -1,7 +1,6 @@
 spec: https://html.spec.whatwg.org/multipage/
 suggested_reviewers:
   - annevk
-  - domenic
   - foolip
   - jdm
   - jgraham
diff --git a/tests/wpt/tests/html/browsers/origin/origin-keyed-agent-clusters/META.yml b/tests/wpt/tests/html/browsers/origin/origin-keyed-agent-clusters/META.yml
index f21ce69f6a7..d3cbccfc31c 100644
--- a/tests/wpt/tests/html/browsers/origin/origin-keyed-agent-clusters/META.yml
+++ b/tests/wpt/tests/html/browsers/origin/origin-keyed-agent-clusters/META.yml
@@ -1,5 +1,4 @@
 spec: https://html.spec.whatwg.org/multipage/#origin-keyed-agent-clusters
 suggested_reviewers:
-  - domenic
   - annevk
   - wjmaclean
diff --git a/tests/wpt/tests/html/canvas/element/global-hdr-headroom/clli-mdcv-png.html b/tests/wpt/tests/html/canvas/element/global-hdr-headroom/clli-mdcv-png.html
new file mode 100644
index 00000000000..b9f93daaef9
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/global-hdr-headroom/clli-mdcv-png.html
@@ -0,0 +1,134 @@
+<!DOCTYPE HTML>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// Render serveral equivalent ISO 21496-1 gainmap images with various values for
+// globalHdrHeadroom.
+// The test images used by this test have an SDR representation (at headroom 0)
+// with pixel values in sRGB of:
+//     #C08040, #8040C0, #40C080, #FFFFFF
+// They have an HDR representation (at headroom 1) with pixel values in sRGB of
+//     #40C080, #C08040,  #8040C0 color(srgb 0x17F/0xFF, 0x17F/0xFF, 0x17F/0xFF)
+// The test images vary in:
+//  * Some have SDR as the base image (encoded as sRGB) and some have HDR as the
+//    base image (encoded as Rec2100 PQ or Rec2100 HLG).
+//  * Some use sRGB as the gain application primaries, others use Rec2020
+// The tests that use a Rec2100 PQ or HLG base are allowed a higher amount of
+// error because of the brutal quantization error in those spaces.
+const tests = [
+  {
+    filename:'pq-clli_none-mdcv_none.png',
+    desc:'No CLLI or MDCV',
+    max_linear_value:1000/203,
+  },
+  {
+    filename:'pq-clli_100-mdcv_p3_5000.png',
+    desc:'CLLI 100, MDCV 5000',
+    max_linear_value:203/203,
+  },
+  {
+    filename:'pq-clli_500-mdcv_none.png',
+    desc:'CLLI 500',
+    max_linear_value:500/203,
+  },
+  {
+    filename:'pq-clli_none-mdcv_rec2020_5000.png',
+    desc:'MDCV 5000',
+    max_linear_value:5000/203,
+  },
+];
+for (const test of tests) {
+  promise_test(async () => {
+    filename = test.filename;
+    const canvas = new OffscreenCanvas(40, 40);
+    const ctx = canvas.getContext('2d', {colorType:'float16'});
+    if (ctx.globalHDRHeadroom === undefined) {
+      return;
+    }
+
+    const pixelLinearValues = [
+      100/203,
+      500/203,
+      1000/203,
+      5000/203,
+    ];
+    const globalHDRHeadroomValues = [
+      0,        // log2(1)
+      1.3045,   // log2(500/203)
+      4.6224,   // log2(5000/203)
+      Infinity,
+    ];
+    const globalHDRHeadroomLinear = [
+      203/203,
+      500/203,
+      5000/203,
+      Infinity,
+    ];
+
+    // Draw the image at the specified headrooms.
+    const image = new Image;
+    image.src = 'resources/' + filename;
+    await new Promise(resolve => image.onload = resolve);
+    for (let hdrHeadroomIndex = 0; hdrHeadroomIndex < 4; ++hdrHeadroomIndex) {
+      ctx.globalHDRHeadroom = globalHDRHeadroomValues[hdrHeadroomIndex];
+      ctx.drawImage(image, 0, 10*hdrHeadroomIndex);
+    }
+
+    // Read back a pixel in each solid color region.
+    for (let hdrHeadroomIndex = 0; hdrHeadroomIndex < 4; ++hdrHeadroomIndex) {
+      for (let pixelIndex = 0; pixelIndex < 4; ++pixelIndex) {
+        const name = 'globalHDRHeadroom: ' +
+                     globalHDRHeadroomValues[hdrHeadroomIndex] +
+                     ', hdrHeadroomIndex:' +
+                     hdrHeadroomIndex;
+        const data = ctx.getImageData(
+            5 + 10*pixelIndex, 5 + 10*hdrHeadroomIndex, 1, 1,
+            {colorSpace:'rec2100-linear', pixelFormat:'rgba-float16'});
+        if (test.max_linear_value <= globalHDRHeadroomLinear[hdrHeadroomIndex]) {
+          // If the test image's (max nits)/203 is <= exp2(globalHDRHeadroom),
+          // then no tone mapping is performed.
+          if (pixelLinearValues[pixelIndex] <=
+              globalHDRHeadroomLinear[hdrHeadroomIndex]) {
+            // Values below the target will be unchanged.
+            const kEps = 0.15;
+            assert_approx_equals(
+                data.data[0], pixelLinearValues[pixelIndex], kEps,
+                'No tone mapping');
+          } else {
+            // Values above the target may be clamped.
+            const kEps = 0.05;
+            assert_greater_than(
+                data.data[0], globalHDRHeadroomLinear[hdrHeadroomIndex] - kEps,
+                'Tone map to or above target max');
+          }
+        } else {
+          // If the test image doesn't fit in targeted headroom, then tone
+          // mapping will happen.
+          if (pixelLinearValues[pixelIndex] == test.max_linear_value) {
+            // Pixels equal to the content maximum will map to the target
+            // maximum.
+            const kEps = 0.05;
+            assert_approx_equals(
+                data.data[0], globalHDRHeadroomLinear[hdrHeadroomIndex], kEps,
+                'Tone map to target max');
+          } else if (pixelLinearValues[pixelIndex] > test.max_linear_value) {
+            // Pixels greater than content maximum will map to be greater or
+            // equal to the target maximum.
+            const kEps = 0.05;
+            assert_greater_than(
+                data.data[0], globalHDRHeadroomLinear[hdrHeadroomIndex] - kEps,
+                'Tone map to or above target max');
+          } else {
+            // Pixels less than the content maximum will map to a value less
+            // than the target maximum.
+            const kEps = 0.05;
+            assert_less_than(
+                data.data[0], globalHDRHeadroomLinear[hdrHeadroomIndex],
+                'Tone map below target max');
+          }
+        }
+      }
+    }
+  }, test.desc);
+}
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/global-hdr-headroom/resources/pq-clli_100-mdcv_p3_5000.png b/tests/wpt/tests/html/canvas/element/global-hdr-headroom/resources/pq-clli_100-mdcv_p3_5000.png
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diff --git a/tests/wpt/tests/html/canvas/element/global-hdr-headroom/resources/pq-clli_none-mdcv_rec2020_5000.png b/tests/wpt/tests/html/canvas/element/global-hdr-headroom/resources/pq-clli_none-mdcv_rec2020_5000.png
new file mode 100644
index 0000000000000000000000000000000000000000..efc76008c0404f5910acb81efcbf4b2042d6dacb
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diff --git a/tests/wpt/tests/html/canvas/element/text/2d.text.measure.text-clusters-split.tentative.html b/tests/wpt/tests/html/canvas/element/text/2d.text.measure.text-clusters-split.tentative.html
index e4f881d03ad..f481a5fb8f1 100644
--- a/tests/wpt/tests/html/canvas/element/text/2d.text.measure.text-clusters-split.tentative.html
+++ b/tests/wpt/tests/html/canvas/element/text/2d.text.measure.text-clusters-split.tentative.html
@@ -20,31 +20,35 @@
 var t = async_test("Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.");
 _addTest(function(canvas, ctx) {
 
+  function getClusterIndexes(text) {
+    const clusters = ctx.measureText(text).getTextClusters();
+    const result = [];
+    for (let i = 0; i < clusters.length; i++) {
+      const end = clusters[i].end;
+      if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) {
+        result.push(clusters[i].start);
+      } else {
+        result.push([clusters[i].start, clusters[i].end]);
+      }
+    }
+    return result;
+  }
+
+  function assertClusterIndexes(text, expected) {
+    const actual = getClusterIndexes(text);
+    assert_array_equals(actual, expected);
+  }
+
   ctx.font = '50px serif';
   const text = 'ABC ☺️❤️';
   ctx.fillText(text, 20, 100);
-  const tm = ctx.measureText(text);
-  const clusters = tm.getTextClusters();
-  // Should return 6 clusters(A|B|C| |☺️|❤️).
-  _assertSame(clusters.length, 6, "clusters.length", "6");
-  // A from position 0 to 1.
-  _assertSame(clusters[0].start, 0, "clusters[\""+(0)+"\"].start", "0");
-  _assertSame(clusters[0].end, 1, "clusters[\""+(0)+"\"].end", "1");
-  // B from position 1 to 2.
-  _assertSame(clusters[1].start, 1, "clusters[\""+(1)+"\"].start", "1");
-  _assertSame(clusters[1].end, 2, "clusters[\""+(1)+"\"].end", "2");
-  // C from position 2 to 3.
-  _assertSame(clusters[2].start, 2, "clusters[\""+(2)+"\"].start", "2");
-  _assertSame(clusters[2].end, 3, "clusters[\""+(2)+"\"].end", "3");
-  // space from position 3 to 4.
-  _assertSame(clusters[3].start, 3, "clusters[\""+(3)+"\"].start", "3");
-  _assertSame(clusters[3].end, 4, "clusters[\""+(3)+"\"].end", "4");
-  // ☺️ from position 4 to 6.
-  _assertSame(clusters[4].start, 4, "clusters[\""+(4)+"\"].start", "4");
-  _assertSame(clusters[4].end, 6, "clusters[\""+(4)+"\"].end", "6");
-  // ❤️ from position 6 to 8.
-  _assertSame(clusters[5].start, 6, "clusters[\""+(5)+"\"].start", "6");
-  _assertSame(clusters[5].end, 8, "clusters[\""+(5)+"\"].end", "8");
+  assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]);
+
+  // [UAX#29]: https://unicode.org/reports/tr29/
+  // [UAX#29] GB9: × (Extend | ZWJ)
+  assertClusterIndexes('X\u200DY', [0, 2]);
+  // [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
+  assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]);
 
 });
 </script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.html b/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.html
index cf24a873c31..fbfb6e2ed15 100644
--- a/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.html
+++ b/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.html
@@ -21,31 +21,35 @@ t.step(function() {
   var canvas = new OffscreenCanvas(400, 200);
   var ctx = canvas.getContext('2d');
 
+  function getClusterIndexes(text) {
+    const clusters = ctx.measureText(text).getTextClusters();
+    const result = [];
+    for (let i = 0; i < clusters.length; i++) {
+      const end = clusters[i].end;
+      if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) {
+        result.push(clusters[i].start);
+      } else {
+        result.push([clusters[i].start, clusters[i].end]);
+      }
+    }
+    return result;
+  }
+
+  function assertClusterIndexes(text, expected) {
+    const actual = getClusterIndexes(text);
+    assert_array_equals(actual, expected);
+  }
+
   ctx.font = '50px serif';
   const text = 'ABC ☺️❤️';
   ctx.fillText(text, 20, 100);
-  const tm = ctx.measureText(text);
-  const clusters = tm.getTextClusters();
-  // Should return 6 clusters(A|B|C| |☺️|❤️).
-  _assertSame(clusters.length, 6, "clusters.length", "6");
-  // A from position 0 to 1.
-  _assertSame(clusters[0].start, 0, "clusters[\""+(0)+"\"].start", "0");
-  _assertSame(clusters[0].end, 1, "clusters[\""+(0)+"\"].end", "1");
-  // B from position 1 to 2.
-  _assertSame(clusters[1].start, 1, "clusters[\""+(1)+"\"].start", "1");
-  _assertSame(clusters[1].end, 2, "clusters[\""+(1)+"\"].end", "2");
-  // C from position 2 to 3.
-  _assertSame(clusters[2].start, 2, "clusters[\""+(2)+"\"].start", "2");
-  _assertSame(clusters[2].end, 3, "clusters[\""+(2)+"\"].end", "3");
-  // space from position 3 to 4.
-  _assertSame(clusters[3].start, 3, "clusters[\""+(3)+"\"].start", "3");
-  _assertSame(clusters[3].end, 4, "clusters[\""+(3)+"\"].end", "4");
-  // ☺️ from position 4 to 6.
-  _assertSame(clusters[4].start, 4, "clusters[\""+(4)+"\"].start", "4");
-  _assertSame(clusters[4].end, 6, "clusters[\""+(4)+"\"].end", "6");
-  // ❤️ from position 6 to 8.
-  _assertSame(clusters[5].start, 6, "clusters[\""+(5)+"\"].start", "6");
-  _assertSame(clusters[5].end, 8, "clusters[\""+(5)+"\"].end", "8");
+  assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]);
+
+  // [UAX#29]: https://unicode.org/reports/tr29/
+  // [UAX#29] GB9: × (Extend | ZWJ)
+  assertClusterIndexes('X\u200DY', [0, 2]);
+  // [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
+  assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]);
   t.done();
 
 });
diff --git a/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.worker.js b/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.worker.js
index e8d7519b48a..fca70c91adb 100644
--- a/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.worker.js
+++ b/tests/wpt/tests/html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.worker.js
@@ -16,31 +16,35 @@ t.step(function() {
   var canvas = new OffscreenCanvas(400, 200);
   var ctx = canvas.getContext('2d');
 
+  function getClusterIndexes(text) {
+    const clusters = ctx.measureText(text).getTextClusters();
+    const result = [];
+    for (let i = 0; i < clusters.length; i++) {
+      const end = clusters[i].end;
+      if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) {
+        result.push(clusters[i].start);
+      } else {
+        result.push([clusters[i].start, clusters[i].end]);
+      }
+    }
+    return result;
+  }
+
+  function assertClusterIndexes(text, expected) {
+    const actual = getClusterIndexes(text);
+    assert_array_equals(actual, expected);
+  }
+
   ctx.font = '50px serif';
   const text = 'ABC ☺️❤️';
   ctx.fillText(text, 20, 100);
-  const tm = ctx.measureText(text);
-  const clusters = tm.getTextClusters();
-  // Should return 6 clusters(A|B|C| |☺️|❤️).
-  _assertSame(clusters.length, 6, "clusters.length", "6");
-  // A from position 0 to 1.
-  _assertSame(clusters[0].start, 0, "clusters[\""+(0)+"\"].start", "0");
-  _assertSame(clusters[0].end, 1, "clusters[\""+(0)+"\"].end", "1");
-  // B from position 1 to 2.
-  _assertSame(clusters[1].start, 1, "clusters[\""+(1)+"\"].start", "1");
-  _assertSame(clusters[1].end, 2, "clusters[\""+(1)+"\"].end", "2");
-  // C from position 2 to 3.
-  _assertSame(clusters[2].start, 2, "clusters[\""+(2)+"\"].start", "2");
-  _assertSame(clusters[2].end, 3, "clusters[\""+(2)+"\"].end", "3");
-  // space from position 3 to 4.
-  _assertSame(clusters[3].start, 3, "clusters[\""+(3)+"\"].start", "3");
-  _assertSame(clusters[3].end, 4, "clusters[\""+(3)+"\"].end", "4");
-  // ☺️ from position 4 to 6.
-  _assertSame(clusters[4].start, 4, "clusters[\""+(4)+"\"].start", "4");
-  _assertSame(clusters[4].end, 6, "clusters[\""+(4)+"\"].end", "6");
-  // ❤️ from position 6 to 8.
-  _assertSame(clusters[5].start, 6, "clusters[\""+(5)+"\"].start", "6");
-  _assertSame(clusters[5].end, 8, "clusters[\""+(5)+"\"].end", "8");
+  assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]);
+
+  // [UAX#29]: https://unicode.org/reports/tr29/
+  // [UAX#29] GB9: × (Extend | ZWJ)
+  assertClusterIndexes('X\u200DY', [0, 2]);
+  // [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
+  assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]);
   t.done();
 });
 done();
diff --git a/tests/wpt/tests/html/canvas/tools/yaml/text.yaml b/tests/wpt/tests/html/canvas/tools/yaml/text.yaml
index 88073135aa2..23e1ebc6e8e 100644
--- a/tests/wpt/tests/html/canvas/tools/yaml/text.yaml
+++ b/tests/wpt/tests/html/canvas/tools/yaml/text.yaml
@@ -2062,31 +2062,35 @@
     minimal clusters, keeping emojis together.
   size: [400, 200]
   code: |
+    function getClusterIndexes(text) {
+      const clusters = ctx.measureText(text).getTextClusters();
+      const result = [];
+      for (let i = 0; i < clusters.length; i++) {
+        const end = clusters[i].end;
+        if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) {
+          result.push(clusters[i].start);
+        } else {
+          result.push([clusters[i].start, clusters[i].end]);
+        }
+      }
+      return result;
+    }
+
+    function assertClusterIndexes(text, expected) {
+      const actual = getClusterIndexes(text);
+      assert_array_equals(actual, expected);
+    }
+
     ctx.font = '50px serif';
     const text = 'ABC ☺️❤️';
     ctx.fillText(text, 20, 100);
-    const tm = ctx.measureText(text);
-    const clusters = tm.getTextClusters();
-    // Should return 6 clusters(A|B|C| |☺️|❤️).
-    @assert clusters.length === 6;
-    // A from position 0 to 1.
-    @assert clusters[0].start === 0;
-    @assert clusters[0].end === 1;
-    // B from position 1 to 2.
-    @assert clusters[1].start === 1;
-    @assert clusters[1].end === 2;
-    // C from position 2 to 3.
-    @assert clusters[2].start === 2;
-    @assert clusters[2].end === 3;
-    // space from position 3 to 4.
-    @assert clusters[3].start === 3;
-    @assert clusters[3].end === 4;
-    // ☺️ from position 4 to 6.
-    @assert clusters[4].start === 4;
-    @assert clusters[4].end === 6;
-    // ❤️ from position 6 to 8.
-    @assert clusters[5].start === 6;
-    @assert clusters[5].end === 8;
+    assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]);
+
+    // [UAX#29]: https://unicode.org/reports/tr29/
+    // [UAX#29] GB9: × (Extend | ZWJ)
+    assertClusterIndexes('X\u200DY', [0, 2]);
+    // [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
+    assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]);
 
 - name: 2d.text.measure.text-clusters-exceptions.tentative
   desc: >-
diff --git a/tests/wpt/tests/html/editing/dnd/drop/002.xhtml b/tests/wpt/tests/html/editing/dnd/drop/002.xhtml
index 19da353097a..1c81c9ec1e4 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/002.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/002.xhtml
@@ -1,38 +1,98 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>Text input selection drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function selectText()
-  {document.querySelector('input').select()}
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;
-  selectText();}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>Text input selection drag and drop: allowed effects
+    'copy','move','link'</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+    div:nth-child(2) {
+      background-color: green;
+    }
+    div:nth-child(3) {
+      background-color: teal;
+    }
+  </style>
 </head>
-<body onload="selectText()">
-<p><input value="Drag me" ondragstart="start(event)"/></p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag selection and drop it onto any of the green boxes.</p>
+<body>
+  <p>
+    Drag the text from these input fields. Each has a different effectAllowed.
+  </p>
+  <p>
+    <input id="copy-drag" value="Copy me"
+      ondragstart="event.dataTransfer.effectAllowed = 'copy'" />
+    <input id="move-drag" value="Move me"
+      ondragstart="event.dataTransfer.effectAllowed = 'move'" />
+    <input id="link-drag" value="Link me"
+      ondragstart="event.dataTransfer.effectAllowed = 'link'" />
+  </p>
+  <p>
+    Drop targets for each effect:
+  </p>
+  <p>
+  <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+  <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+  <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  function onDragOver(event, effect) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effect;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    for (const effect of ['copy', 'move', 'link']) {
+      // Run tests sequentially due to text selection requirements.
+      promise_test(async (t) => {
+        const dragInput = document.getElementById(effect + '-drag');
+        const dropDiv = document.getElementById(effect + '-drop');
+
+        // Select the text before drag
+        dragInput.select();
+        dragInput.focus();
+
+        await new Promise(async (resolve, reject) => {
+          dropDiv.addEventListener('drop', t.step_func((
+            event) => {
+            try {
+              dropEffectOnDropCallBack(event);
+              resolve();
+            } catch (e) {
+              reject(e);
+            }
+          }));
+          try {
+            let actions = new test_driver.Actions();
+            actions = movePointerToCenter(dragInput, /*iframe=*/
+                null, actions)
+              .pointerDown();
+            actions = movePointerToCenter(dropDiv, /*iframe=*/
+                null, actions)
+              .pointerUp();
+            await actions.send();
+          } catch (e) {
+            reject(e);
+          }
+        });
+      });
+    }
+  }
+  test();
+</script>
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/drop/003.xhtml b/tests/wpt/tests/html/editing/dnd/drop/003.xhtml
index b114c3770e7..b1d94ab2e3d 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/003.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/003.xhtml
@@ -1,35 +1,69 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>Link drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>dropEffect matches effectAllowed for link drag and drop</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+
+    div:nth-child(2) {
+      background-color: green;
+    }
+
+    div:nth-child(3) {
+      background-color: teal;
+    }
+  </style>
 </head>
-<body onload="selectText()">
-<p><a href="data:text/plain,1" ondragstart="start(event)">Drag me</a></p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag link and drop it onto any of the green boxes.</p>
+<body>
+  <p>
+    Drag these links. Each has a different effectAllowed.
+  </p>
+  <p>
+    <a id="copy-drag" href="data:text/plain,copy" ondragstart="event.dataTransfer.effectAllowed = 'copy'">Copy Link</a>
+    <a id="move-drag" href="data:text/plain,move" ondragstart="event.dataTransfer.effectAllowed = 'move'">Move Link</a>
+    <a id="link-drag" href="data:text/plain,link" ondragstart="event.dataTransfer.effectAllowed = 'link'">Link Link</a>
+  </p>
+  <p>
+    Drop targets for each effect:
+  </p>
+  <p>
+    <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+    <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+    <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  function onDragOver(event, effect) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effect;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    for (const effect of ['copy', 'move', 'link']) {
+      const dragLink = document.getElementById(effect + '-drag');
+      const dropDiv = document.getElementById(effect + '-drop');
+
+      dragDropTest(
+        dragLink, dropDiv, dropEffectOnDropCallBack,
+        'dropEffect should match effectAllowed on drop for ' + effect);
+    }
+  }
+  test();
+</script>
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/drop/004.xhtml b/tests/wpt/tests/html/editing/dnd/drop/004.xhtml
index 715792f8ef1..ae2448ff5a3 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/004.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/004.xhtml
@@ -1,35 +1,78 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>PNG image drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>dropEffect matches effectAllowed for PNG image drag and drop</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+
+    div:nth-child(2) {
+      background-color: green;
+    }
+
+    div:nth-child(3) {
+      background-color: teal;
+    }
+
+  </style>
 </head>
-<body onload="selectText()">
-<p><img ondragstart="start(event)" src="data:image/png;base64,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" alt="PNG circle"/></p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag circle and drop it onto any of the green boxes.</p>
+<body>
+  <p>
+    Drag these images. Each has a different effectAllowed.
+  </p>
+  <p>
+    <img id="copy-drag" ondragstart="event.dataTransfer.effectAllowed = 'copy'"
+      src="data:image/png;base64,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"
+      alt="Green circle with copy" />
+    <img id="move-drag" ondragstart="event.dataTransfer.effectAllowed = 'move'"
+      src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAEq0lEQVR42u1dvU4bQRAeR0RCCilSp0peIoKGB4DSXYRDlcZlFClKBI4bB/kV/AymIDwCTahiicaioEOxhCsjWVTJziyKMfYZn+9ud3bvG2mEZB13u9+nndmf2Rki7fKFXtEBbVKD9o22jB4bPaND6hm9Mjo0enevw/vfevKMfbYl/8vv4HdBUkvFALhltG2A7dN3+pur8jv53fwN/hZkjjRo3eiuAatjdJA7CcnkDOSb/G1uQ6mFzUeDagaQrvl764yEJOU22LbUymXaGrRhOt40OvJOQvLIGUkbP9GLeIn4SM9NJ+tOTVI+Jq0ubY9sVFRNxy6DIWKWmEvpQ/ByQNumI+fBEjHrZ86lT8HJV3ptGn8aDRGzxJxKHwMZFe9Mg6+jJWNCyrX0VbUc0nuj4+jJmPiWsfRZodN+ZvSoNETMjpYjwUCFfKaXpjEnpSVjQsqJYOF5ZLw1elF6MiakXAgmnpw378DegIgZUm4EGw8jA2QsIuUbvXHpM2CmljFfhfsUO5uCA0/j6AudfZV5arv6WuVHcYs+ALwqKTkvHnmLoEwr8CJW9Llts9iNwvj3plzsfeWyIRnzrq37kfIzq6naBpA5a6bzlJgOl/SMkl+rklEFgIX5k5THwTYgIdwzcP2jhM/o19KsOeoArnBS6suaqo2gQnXCJWSwXNwXB4gBMFekNBeTwSGUmiMK4yNktDhsleNaAZRrUvYWmasuQHJOSDdpdKyriEIvo9maexWC70gAIF/bKTvzzFUH4HgbJZ3HdFSw9vC6lfKHpq7X8X07AOOblK2HhLQBindC2g/9Rx+gePcj/cnqHIDoUFm1c9gjwNAy/d0kyXIAMLSYrQ8kqScAhhbH3iLJBwIwtBByTJKkBWBoIeSMJHMOwNBCyG+SdEYAQ4tTvyLJMQUwtBAyJEn8BTC0EHIHQhQSApOlzGTBqaty6jzVAhhaCOlhYahuYYitE02EHGNzURchLZItX4ChhZB9HFBpUjmgwhGuHv0feI0gBw1T3j7CgHT5jzYC5XQRsjUdSsrhjADGl7ka0EylBgRb+ySkMy9rww7A8Waududf2MH9Qh9k3CbXLsGVNh/mqrvojuEeQHI+Qmq4Fq1ndIyeruaDxAEuCWk+ncmB0z3gepubtQenMUHyGTWELJl8xk6B15CeqVAyLtPXtUICsyJnVivWs+J0dAAwbzLOkQRTk2YuKsapTQFkXqPjlDILEinnRcZ1fpXdkGo866xqnH9FNyTjz0JIQZXcuPQCAE5rqo6oMEFBl7RknBRfTg8lj5Yl48JdGT0ueIWiYIvIuHFfPg9l85LJcF42b+JTUFjysZnyVlhy2qfA0asovTo9+0JxYnWC8t0KBQXuFYrdkIy3mBj3LbeNQrejZTuqOlbcl8znGTqcfjXoM3pboqgaPhEPxda1qgcVYsRt5TanDkgISWzcV1N1hCS3jdu4dNxUDMIhlBzXysHGGspkcBtsW2pPh3fGLrZ2ya5cXHFp0qxJ6si3E68EQCpy344vQRZxO5jfye+2d/oqgHsV02Z3lvcl9QTnA+EkLZw5h9MZcY4pTvxldXj/W0+esc+25H/5HQGYon+Q5f+MwFz+8QAAAABJRU5ErkJggg=="
+      alt="PNG circle" />
+    <img id="link-drag" ondragstart="event.dataTransfer.effectAllowed = 'link'"
+      src="data:image/png;base64,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"
+      alt="PNG circle" />
+  </p>
+  <p>
+    Drop targets for each effect:
+  </p>
+  <p>
+    <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+    <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+    <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  function onDragOver(event, effect) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effect;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    for (const effect of ['copy', 'move', 'link']) {
+      const dragImage = document.getElementById(effect + '-drag');
+      const dropDiv = document.getElementById(effect + '-drop');
+
+      dragDropTest(
+        dragImage, dropDiv, dropEffectOnDropCallBack,
+        'dropEffect should match effectAllowed on drop for ' + effect);
+    }
+  }
+  test();
+
+</script>
+
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/drop/005.xhtml b/tests/wpt/tests/html/editing/dnd/drop/005.xhtml
index a6c237c29de..06a98957aad 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/005.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/005.xhtml
@@ -1,35 +1,75 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>SVG image drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>SVG image drag and drop: allowed effects 'copy','move','link'</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+
+    div:nth-child(2) {
+      background-color: green;
+    }
+
+    div:nth-child(3) {
+      background-color: teal;
+    }
+  </style>
 </head>
-<body onload="selectText()">
-<p><img ondragstart="start(event)" src="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20version%3D%221.1%22%20width%3D%22100px%22%20height%3D%22100px%22%20viewBox%3D%220%200%20100%20100%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22green%22/%3E%3C/svg%3E" alt="SVG circle"/></p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag circle and drop it onto any of the green boxes.</p>
+<body>
+  <p>
+    Drag these SVG images. Each has a different effectAllowed and color.
+  </p>
+  <p>
+    <img id="copy-drag" ondragstart="event.dataTransfer.effectAllowed = 'copy'"
+      src="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20version%3D%221.1%22%20width%3D%22100px%22%20height%3D%22100px%22%20viewBox%3D%220%200%20100%20100%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22olive%22/%3E%3C/svg%3E"
+      alt="Olive SVG circle for copy" />
+    <img id="move-drag" ondragstart="event.dataTransfer.effectAllowed = 'move'"
+      src="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20version%3D%221.1%22%20width%3D%22100px%22%20height%3D%22100px%22%20viewBox%3D%220%200%20100%20100%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22green%22/%3E%3C/svg%3E"
+      alt="Green SVG circle for move" />
+    <img id="link-drag" ondragstart="event.dataTransfer.effectAllowed = 'link'"
+      src="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20version%3D%221.1%22%20width%3D%22100px%22%20height%3D%22100px%22%20viewBox%3D%220%200%20100%20100%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22teal%22/%3E%3C/svg%3E"
+      alt="Teal SVG circle for link" />
+  </p>
+  <p>
+    Drop targets for each effect:
+  </p>
+  <p>
+    <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+    <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+    <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  function onDragOver(event, effect) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effect;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    for (const effect of ['copy', 'move', 'link']) {
+      const dragImage = document.getElementById(effect + '-drag');
+      const dropDiv = document.getElementById(effect + '-drop');
+
+      dragDropTest(
+        dragImage, dropDiv, dropEffectOnDropCallBack,
+        'dropEffect should match effectAllowed on drop for ' + effect);
+    }
+  }
+  test();
+</script>
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/drop/006.xhtml b/tests/wpt/tests/html/editing/dnd/drop/006.xhtml
index 3faea1803ff..8ba107dfc24 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/006.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/006.xhtml
@@ -1,50 +1,95 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>Canvas drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>Canvas drag and drop: allowed effects 'copy','move','link'</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+    div:nth-child(2) {
+      background-color: green;
+    }
+    div:nth-child(3) {
+      background-color: teal;
+    }
+  </style>
 </head>
-<body onload="selectText()">
-<p>
-  <canvas width="100" height="100" draggable="true" ondragstart="start(event)" ondragenter="event.preventDefault()" ondragover="return false" ondrop="addImage(event)">Canvas</canvas>
-</p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag canvas pattern and drop it onto any of the green boxes.</p>
-<script type="application/ecmascript">
-var canvas = document.querySelector('canvas'),
-c = canvas.getContext('2d');
-for(var x = 0; x != 50; x++)
-  {c.fillStyle = (x%2 == 0)?'navy':'white';
-  c.beginPath();
-  c.moveTo(x,x);
-  c.lineTo(100-x,x);
-  c.lineTo(100-x,100-x);
-  c.lineTo(x,100-x);
-  c.closePath();
-  c.fill();}
-</script>
+<body>
+  <p>
+    Drag these canvas elements. Each has a different effectAllowed and color
+    pattern.
+  </p>
+  <p>
+    <canvas id="copy-drag" width="100" height="100" draggable="true"
+      ondragstart="event.dataTransfer.effectAllowed = 'copy'">Copy
+      Canvas</canvas>
+    <canvas id="move-drag" width="100" height="100" draggable="true"
+      ondragstart="event.dataTransfer.effectAllowed = 'move'">Move
+      Canvas</canvas>
+    <canvas id="link-drag" width="100" height="100" draggable="true"
+      ondragstart="event.dataTransfer.effectAllowed = 'link'">Link
+      Canvas</canvas>
+  </p>
+  <p>
+    Drop targets for each effect:
+  </p>
+  <p>
+  <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+  <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+  <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  // Draw patterns on the three canvases with different colors
+  function drawCanvasPattern(canvasId, primaryColor, secondaryColor) {
+    var canvas = document.getElementById(canvasId),
+      c = canvas.getContext('2d');
+    for (var x = 0; x != 50; x++) {
+      c.fillStyle = (x % 2 == 0) ? primaryColor : secondaryColor;
+      c.beginPath();
+      c.moveTo(x, x);
+      c.lineTo(100 - x, x);
+      c.lineTo(100 - x, 100 - x);
+      c.lineTo(x, 100 - x);
+      c.closePath();
+      c.fill();
+    }
+  }
+
+  // Draw the three canvas patterns
+  drawCanvasPattern('copy-drag', 'olive', 'white');
+  drawCanvasPattern('move-drag', 'green', 'white');
+  drawCanvasPattern('link-drag', 'teal', 'white');
+
+  function onDragOver(event, effect) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effect;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    for (const effect of ['copy', 'move', 'link']) {
+      const dragCanvas = document.getElementById(effect + '-drag');
+      const dropDiv = document.getElementById(effect + '-drop');
+
+      dragDropTest(
+        dragCanvas, dropDiv, dropEffectOnDropCallBack,
+        'dropEffect should match effectAllowed on drop for ' + effect);
+    }
+  }
+  test();
+</script>
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/resources/test-helper.js b/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
index ebc945b5f05..917954068a6 100644
--- a/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
+++ b/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
@@ -183,3 +183,14 @@ const calculateScrollbarThickness = () => {
 
     return widthBefore - widthAfter;
 }
+
+// Drop callback used for `dropEffect` tests in `dnd/drop/`. This function
+// compares the text content of the drop target with the `dropEffect` and
+// `effectAllowed` values of the `dataTransfer` object. The only
+// `effectAllowed` values that will be compared are "copy", "move", and "link"
+// since they have to correspond to the `dropEffect` value of the event.
+function dropEffectOnDropCallBack(event) {
+  assert_equals(event.target.textContent, event.dataTransfer.dropEffect);
+  assert_equals(event.target.textContent, event.dataTransfer.effectAllowed);
+  return true;
+}
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-keyboard-behavior.optional.html b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-keyboard-behavior.optional.html
index c06f2423c05..63558233935 100644
--- a/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-keyboard-behavior.optional.html
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-keyboard-behavior.optional.html
@@ -140,7 +140,7 @@ for (const id of ['defaultbutton', 'custombutton']) {
     }, {once: true});
     await test_driver.send_keys(select, Enter);
     await new Promise(requestAnimationFrame);
-    assert_true(formWasSubmitted,
+    assert_false(formWasSubmitted,
       'Enter should submit the form when the listbox is closed.');
     assert_false(select.matches(':open'),
       'Enter should not open the listbox when it is in a form.');
diff --git a/tests/wpt/tests/html/semantics/grouping-content/META.yml b/tests/wpt/tests/html/semantics/grouping-content/META.yml
deleted file mode 100644
index 0f3cf596537..00000000000
--- a/tests/wpt/tests/html/semantics/grouping-content/META.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-suggested_reviewers:
-  - domenic
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source-commandfor.tentative.html b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source-commandfor.tentative.html
new file mode 100644
index 00000000000..0fe696bcbc9
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source-commandfor.tentative.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/9111">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../../popovers/resources/toggle-event-source-test.js"></script>
+
+<button id=commandsource commandfor=details command=toggle>command source</button>
+<details id=details>
+  <summary>summary</summary>
+  details
+</details>
+
+<script>
+const details = document.getElementById('details');
+const commandsource = document.getElementById('commandsource');
+
+createToggleEventSourceTest({
+  description: 'ToggleEvent.source on <details> elements: command invokers.',
+  target: details,
+  openFunc: async () => commandsource.click(),
+  closeFunc: async () => commandsource.click(),
+  openSource: commandsource,
+  closeSource: commandsource,
+  skipBeforetoggle: true
+});
+</script>
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source.html b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source.html
index 1a571f54414..7708750685d 100644
--- a/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source.html
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-details-element/details-toggle-source.html
@@ -8,7 +8,6 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="../../popovers/resources/toggle-event-source-test.js"></script>
 
-<button id=commandsource commandfor=details command=toggle>command source</button>
 <details id=details>
   <summary>summary</summary>
   details
@@ -22,7 +21,6 @@
 const details = document.getElementById('details');
 const detailsWithoutSummary = document.getElementById('detailsWithoutSummary');
 const summary = details.querySelector('summary');
-const commandsource = document.getElementById('commandsource');
 
 async function click(element) {
   // Click halfway up the element to click the activatable summary instead of
@@ -64,14 +62,4 @@ createToggleEventSourceTest({
   closeSource: null,
   skipBeforetoggle: true
 });
-
-createToggleEventSourceTest({
-  description: 'ToggleEvent.source on <details> elements: command invokers.',
-  target: details,
-  openFunc: async () => commandsource.click(),
-  closeFunc: async () => commandsource.click(),
-  openSource: commandsource,
-  closeSource: commandsource,
-  skipBeforetoggle: true
-});
 </script>
diff --git a/tests/wpt/tests/html/semantics/interestfor/interestfor-invoker-descendants.tentative.html b/tests/wpt/tests/html/semantics/interestfor/interestfor-invoker-descendants.tentative.html
index 2b8f218f5b7..cd9185a0108 100644
--- a/tests/wpt/tests/html/semantics/interestfor/interestfor-invoker-descendants.tentative.html
+++ b/tests/wpt/tests/html/semantics/interestfor/interestfor-invoker-descendants.tentative.html
@@ -17,6 +17,8 @@
 <button id=otherbutton>Other button</button>
 <style>
   [interestfor] { interest-delay: 0s; }
+  :interest-source { background-color: lightgreen;}
+  :interest-target { background-color: lightblue;}
 </style>
 
 <script>
@@ -25,57 +27,42 @@ const innerSpan = document.getElementById('inner-span');
 const target = document.getElementById('target');
 const otherbutton = document.getElementById('otherbutton');
 
-promise_test(async function (t) {
-  t.add_cleanup(() => focusOn(otherbutton));
-  const signal = t.get_signal();
-  let interestCount = 0;
-  let loseInterestCount = 0;
-  target.addEventListener('interest',() => (++interestCount),{signal});
-  target.addEventListener('loseinterest',() => (++loseInterestCount),{signal});
-  await focusOn(invoker);
-  assert_true(invoker.matches(':interest-source'),'focusing invoker should show interest');
-  assert_equals(interestCount,1,'One interest event');
-  interestCount = 0;
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await focusOn(innerSpan);
-  assert_true(invoker.matches(':interest-source'),'focusing inner span should keep interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await focusOn(invoker);
-  assert_true(invoker.matches(':interest-source'),'focusing back to outer button should keep interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await focusOn(otherbutton);
-  assert_false(invoker.matches(':interest-source'),'focusing outside should lose interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,1,'Finally got loseinterest event');
-},'Moving focus within invoker works correctly');
+async function showInterest(el, method) {
+  if (method === 'focus') {
+    await focusOn(el);
+  } else {
+    assert_equals(method,'hover');
+    await hoverOver(el);
+  }
+}
 
-promise_test(async function (t) {
-  t.add_cleanup(() => focusOn(otherbutton));
-  const signal = t.get_signal();
-  let interestCount = 0;
-  let loseInterestCount = 0;
-  target.addEventListener('interest',() => (++interestCount),{signal});
-  target.addEventListener('loseinterest',() => (++loseInterestCount),{signal});
-  await hoverOver(invoker);
-  assert_true(invoker.matches(':interest-source'),'hovering invoker should show interest');
-  assert_equals(interestCount,1,'One interest event');
-  interestCount = 0;
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await hoverOver(innerSpan);
-  assert_true(invoker.matches(':interest-source'),'hovering inner span should keep interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await hoverOver(invoker);
-  assert_true(invoker.matches(':interest-source'),'hovering back to outer button should keep interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,0,'No loseinterest events');
-  await hoverOver(otherbutton);
-  assert_false(invoker.matches(':interest-source'),'hovering outside should lose interest');
-  assert_equals(interestCount,0,'No extra interest events');
-  assert_equals(loseInterestCount,1,'Finally got loseinterest event');
-},'Moving hover within invoker works correctly');
+['focus','hover'].forEach(method => {
+  promise_test(async function (t) {
+    t.add_cleanup(() => showInterest(otherbutton, method));
+    const signal = t.get_signal();
+    let interestCount = 0;
+    let loseInterestCount = 0;
+    target.addEventListener('interest',() => (++interestCount),{signal});
+    target.addEventListener('loseinterest',() => (++loseInterestCount),{signal});
+    await showInterest(invoker, method);
+    assert_true(invoker.matches(':interest-source'),'focusing invoker should show interest');
+    assert_equals(interestCount,1,'One interest event');
+    interestCount = 0;
+    assert_equals(loseInterestCount,0,'No loseinterest events');
+    await showInterest(innerSpan, method);
+    assert_true(invoker.matches(':interest-source'),'focusing inner span should keep interest');
+    assert_equals(interestCount,0,'No extra interest events');
+    assert_equals(loseInterestCount,0,'No loseinterest events');
+    await showInterest(invoker, method);
+    assert_true(invoker.matches(':interest-source'),'focusing back to outer button should keep interest');
+    assert_equals(interestCount,0,'No extra interest events');
+    assert_equals(loseInterestCount,0,'No loseinterest events');
+    await showInterest(otherbutton, method);
+    assert_false(invoker.matches(':interest-source'),'focusing outside should lose interest');
+    assert_equals(interestCount,0,'No extra interest events');
+    assert_equals(loseInterestCount,1,'Finally got loseinterest event');
+  },`Moving focus within invoker, ${method}`);
+});
 </script>
 
 <a id=outer href="#" interestfor="middle">Outer</a>
@@ -90,43 +77,119 @@ const middle = document.getElementById('middle');
 const middleLink = document.getElementById('middle-link');
 const inner = document.getElementById('inner');
 const innerButton = document.getElementById('inner-button');
-promise_test(async function (t) {
-  t.add_cleanup(() => focusOn(otherbutton));
-  assert_false(middle.matches(':popover-open'),'middle starts closed');
-  await focusOn(outer);
-  assert_true(outer.matches(':interest-source'),'focusing outer should show interest');
-  assert_true(middle.matches(':popover-open'),'outer popover open');
 
-  await focusOn(middleLink);
-  assert_true(middleLink.matches(':interest-source'),'focusing middle should show interest');
-  assert_true(outer.matches(':interest-source'),'outer keeps interest');
-  assert_true(middle.matches(':popover-open'),'middle popover stays open');
-  assert_true(inner.matches(':popover-open'),'inner popover opens');
+['focus','hover'].forEach(method => {
+  promise_test(async function (t) {
+    t.add_cleanup(() => showInterest(otherbutton, method));
+    assert_false(middle.matches(':popover-open'),'middle starts closed');
+    await showInterest(outer, method);
+    assert_true(outer.matches(':interest-source'),'focusing outer should show interest');
+    assert_true(middle.matches(':popover-open'),'outer popover open');
 
-  await focusOn(innerButton);
-  assert_true(outer.matches(':interest-source'),'outer keeps interest');
-  assert_true(middleLink.matches(':interest-source'),'middle keeps interest');
-  assert_true(middle.matches(':popover-open'),'middle popover stays open');
-  assert_true(inner.matches(':popover-open'),'inner popover stays open');
-},'Nested invokers maintain interest properly (focus)');
+    await showInterest(middleLink, method);
+    assert_true(middleLink.matches(':interest-source'),'focusing middle should show interest');
+    assert_true(outer.matches(':interest-source'),'outer keeps interest');
+    assert_true(middle.matches(':popover-open'),'middle popover stays open');
+    assert_true(inner.matches(':popover-open'),'inner popover opens');
 
-promise_test(async function (t) {
-  t.add_cleanup(() => focusOn(otherbutton));
-  assert_false(middle.matches(':popover-open'),'middle starts closed');
-  await hoverOver(outer);
-  assert_true(outer.matches(':interest-source'),'hovering outer should show interest');
-  assert_true(middle.matches(':popover-open'),'outer popover open');
-
-  await hoverOver(middleLink);
-  assert_true(outer.matches(':interest-source'),'outer keeps interest');
-  assert_true(middle.matches(':popover-open'),'middle popover stays open');
-  assert_true(middleLink.matches(':interest-source'),'hovering middle should show interest');
-  assert_true(inner.matches(':popover-open'),'inner popover opens');
-
-  await hoverOver(innerButton);
-  assert_true(outer.matches(':interest-source'),'outer keeps interest');
-  assert_true(middleLink.matches(':interest-source'),'middle keeps interest');
-  assert_true(middle.matches(':popover-open'),'middle popover stays open');
-  assert_true(inner.matches(':popover-open'),'inner popover stays open');
-},'Nested invokers maintain interest properly (hover)');
+    await showInterest(innerButton, method);
+    assert_true(outer.matches(':interest-source'),'outer keeps interest');
+    assert_true(middleLink.matches(':interest-source'),'middle keeps interest');
+    assert_true(middle.matches(':popover-open'),'middle popover stays open');
+    assert_true(inner.matches(':popover-open'),'inner popover stays open');
+  },`Nested invokers, ${method}`);
+});
+</script>
+
+<a id=outer2-first href="#" interestfor="middle2-inner">Outer first</a>
+<a id=outer2-second href="#" interestfor="middle2-outer">Outer second</a>
+<div id="middle2-outer">Middle outer
+  <div id="middle2-inner">Middle inner
+    <a id="middle2-link" href="#" interestfor="inner2">Middle</a>
+  </div>
+</div>
+<div id="inner2">Inner <button id="inner2-button">btn</button></div>
+
+<script>
+const outer2First = document.getElementById('outer2-first');
+const outer2Second = document.getElementById('outer2-second');
+const middle2Outer = document.getElementById('middle2-outer');
+const middle2Inner = document.getElementById('middle2-inner');
+const middle2Link = document.getElementById('middle2-link');
+const inner2 = document.getElementById('inner2');
+const inner2Button = document.getElementById('inner2-button');
+
+['focus','hover'].forEach(method => {
+  promise_test(async function (t) {
+    t.add_cleanup(() => showInterest(otherbutton, method));
+    const hideDelayMs = 500; // Long enough to focus a few things without elapsing
+    outer2First.style.interestDelayEnd = `${hideDelayMs}ms`;
+
+    const hoverStart = performance.now();
+    await showInterest(outer2First, method);
+    assert_true(outer2First.matches(':interest-source'),'should show interest');
+    assert_false(outer2Second.matches(':interest-source'),'no interest yet in second target');
+    await showInterest(outer2Second, method);
+    assert_true(outer2Second.matches(':interest-source'),'outer2Second should now have interest');
+    await showInterest(middle2Link, method);
+    let firstHasInterest = outer2First.matches(':interest-source');
+    if (performance.now() - hoverStart >= hideDelayMs) {
+      return; // Test is running too slowly
+    }
+    assert_true(firstHasInterest,'outer2First should still have interest (delay)');
+    assert_true(inner2.matches(':interest-target'),'inner2 should be an interest target');
+    assert_true(middle2Outer.matches(':interest-target'),'middle2Outer should still be an interest target');
+    assert_true(outer2Second.matches(':interest-source'),'outer2Second should still have interest');
+
+    // Focusing the inner target should keep both outer invokers alive.
+    await showInterest(inner2Button, method);
+    assert_true(middle2Outer.matches(':interest-target'),'middle2Outer should still be an interest target (after moving to inner button)');
+    assert_true(outer2Second.matches(':interest-source'),'outer2Second should still have interest (after moving to inner button)');
+    assert_true(outer2First.matches(':interest-source'),'outer2First should still have interest');
+
+    // Now let the time elapse and make sure things are still good.
+    const elapsedMs = performance.now() - hoverStart;
+    await new Promise(resolve => step_timeout(resolve,hideDelayMs - elapsedMs + 10));
+    assert_true(inner2.matches(':interest-target'),'inner2 should still be an interest target');
+    assert_true(middle2Outer.matches(':interest-target'),'middle2Outer should still be an interest target');
+    assert_true(outer2Second.matches(':interest-source'),'outer2Second should still have interest');
+    assert_true(outer2First.matches(':interest-source'),'outer2First should still have interest');
+    assert_true(middle2Inner.matches(':interest-target'),'middle2Inner should still be an interest target');
+  },`Nested invokers with intermediate interest target, ${method}`);
+});
+</script>
+
+
+<a id=outer3 href="#" interestfor="middle3-inner">Outer</a>
+<div id="middle3-outer">Middle <button id=middle3-button>outer</button>
+  <div id="middle3-inner">Middle inner
+    <a id="middle3-link" href="#" interestfor="middle3-outer">Middle</a>
+  </div>
+</div>
+
+<script>
+const outer3 = document.getElementById('outer3');
+const middle3Outer = document.getElementById('middle3-outer');
+const middle3Inner = document.getElementById('middle3-inner');
+const middle3Link = document.getElementById('middle3-link');
+const middle3Button = document.getElementById('middle3-button');
+
+['focus','hover'].forEach(method => {
+  promise_test(async function (t) {
+    t.add_cleanup(() => showInterest(otherbutton, method));
+    await showInterest(outer3, method);
+    assert_true(outer3.matches(':interest-source'),'should show interest');
+    assert_true(middle3Inner.matches(':interest-target'),'middle3Inner should now be an interest target');
+    await showInterest(middle3Link, method);
+    assert_true(middle3Link.matches(':interest-source'),'middle3Link should now have interest');
+    assert_true(middle3Outer.matches(':interest-target'),'middle3Outer should now be an interest target');
+    assert_true(outer3.matches(':interest-source'),'outer3 should still have interest');
+    assert_true(middle3Inner.matches(':interest-target'),'middle3Inner should still be an interest target');
+    await showInterest(middle3Button, method);
+    assert_true(middle3Link.matches(':interest-source'),'middle3Link should now have interest (on outer button)');
+    assert_true(middle3Outer.matches(':interest-target'),'middle3Outer should now be an interest target (on outer button)');
+    assert_true(outer3.matches(':interest-source'),'outer3 no longer has interest (on outer button)');
+    assert_true(middle3Inner.matches(':interest-target'),'middle3Inner is no longer an interest target (on outer button)');
+  },`Nested invokers with circular dependencies, ${method}`);
+});
 </script>
diff --git a/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-error.html b/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-error.html
new file mode 100644
index 00000000000..68b0a793b8a
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-error.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<meta charset="utf-8" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js?feature=bidi"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script>
+  promise_setup(async () => {
+    // Ensure permission is denied before proceeding.
+    await test_driver.bidi.permissions.set_permission({
+      descriptor: { name: 'geolocation' },
+      state: 'denied',
+    });
+  });
+
+  promise_test(async (t) => {
+    document.innerHTML +=
+      '<geolocation id="geolocation-element" autolocate onlocation="onLocation()"></geolocation>';
+  }, 'Tests Geolocation element\'s error callback');
+
+  function onLocation() {
+    const el = document.getElementById('geolocation-element');
+    assert_equals(el.position, null);
+    assert_equals(el.error.code, 1);
+    assert_equals(el.error.message, 'User denied Geolocation');
+  }
+</script>
diff --git a/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-success.html b/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-success.html
new file mode 100644
index 00000000000..fd437e37686
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/permission-element/geolocation-element/get-current-position-success.html
@@ -0,0 +1,40 @@
+<!doctype html>
+<meta charset="utf-8" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js?feature=bidi"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script>
+  promise_setup(async () => {
+    // Ensure permission is granted before proceeding.
+    await test_driver.bidi.permissions.set_permission({
+      descriptor: { name: 'geolocation' },
+      state: 'granted',
+    });
+  });
+
+  promise_test(async (t) => {
+    t.add_cleanup(async () => {
+      await test_driver.bidi.emulation.set_geolocation_override({ coordinates: null });
+    });
+
+    const latitude = 50;
+    const longitude = 0;
+    const accuracy = 100;
+
+    await test_driver.bidi.emulation.set_geolocation_override({
+      coordinates: { latitude, longitude, accuracy },
+    });
+    document.innerHTML +=
+      '<geolocation id="geolocation-element" autolocate onlocation="onLocation()"></geolocation>';
+  }, 'Tests Geolocation element\'s success callback');
+
+  function onLocation() {
+    let el = document.getElementById('geolocation-element');
+    assert_equals(el.position.coords.latitude, 50);
+    assert_equals(el.position.coords.longitude, 0);
+    assert_equals(el.position.coords.accuracy, 100);
+    assert_equals(el.error, null);
+  }
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-alignment-001-ref.html b/tests/wpt/tests/html/semantics/popovers/popover-alignment-001-ref.html
new file mode 100644
index 00000000000..8bf4a0ac9a7
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-alignment-001-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>Tests that popover alignment responds to anchor positioning</title>
+<link rel="author" href="mailto:tabatkins@google.com">
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+
+<style>
+button {
+  border: solid blue 15px;
+  margin: 25px;
+}
+div {
+  position: absolute;
+  border: solid orange 10px;
+  inset: 0;
+  margin: 0;
+  place-self: center;
+  padding: .25em;
+}
+</style>
+
+Orange box should be centered on the screen.
+<button></button>
+<div id="p1"></div>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-alignment-001.html b/tests/wpt/tests/html/semantics/popovers/popover-alignment-001.html
new file mode 100644
index 00000000000..1f08fcf280f
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-alignment-001.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>Tests that popover alignment responds to anchor positioning</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#conditional-centering">
+<link rel="match" href="popover-alignment-001-ref.html">
+<link rel="author" href="mailto:tabatkins@google.com">
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+
+<style>
+button {
+  border: solid blue 15px;
+  margin: 25px;
+}
+[popover] {
+  border: solid orange 10px;
+}
+</style>
+
+Orange box should be centered on the screen.
+<button popovertarget=p1></button>
+<div id="p1" popover></div>
+
+<script>
+document.querySelector("[popover]").showPopover();
+document.documentElement.removeAttribute("class");
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-alignment-002-ref.html b/tests/wpt/tests/html/semantics/popovers/popover-alignment-002-ref.html
new file mode 100644
index 00000000000..27376d97224
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-alignment-002-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>Tests that popover alignment responds to anchor positioning</title>
+<link rel="author" href="mailto:tabatkins@google.com">
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+<style>
+button {
+  border: solid blue 15px;
+  margin: 25px;
+  anchor-name: --foo;
+}
+div {
+  position: absolute;
+  border: solid orange 10px;
+  inset: 0;
+  margin: 0;
+  padding: .25em;
+  place-self: normal;
+  position-anchor: --foo;
+}
+</style>
+
+Orange box should be centered vertically against the left edge of the blue box.
+<button></button>
+<div style="position-area: left span-all"></div>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-alignment-002.html b/tests/wpt/tests/html/semantics/popovers/popover-alignment-002.html
new file mode 100644
index 00000000000..e296cedce14
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-alignment-002.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>Tests that popover alignment responds to anchor positioning</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#conditional-centering">
+<link rel="match" href="popover-alignment-002-ref.html">
+<link rel="author" href="mailto:tabatkins@google.com">
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+
+<style>
+button {
+  border: solid blue 15px;
+  margin: 25px;
+}
+[popover] {
+  border: solid orange 10px;
+}
+</style>
+
+Orange box should be centered vertically against the left edge of the blue box.
+<button popovertarget=p3></button>
+<div id="p3" popover style="position-area: left span-all"></div>
+
+<script>
+document.querySelector("[popover]").showPopover();
+document.documentElement.removeAttribute("class");
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-anchor-multicol-display.tentative.html b/tests/wpt/tests/html/semantics/popovers/popover-anchor-multicol-display.tentative.html
index fe65ec5ba4e..f8db954924c 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-anchor-multicol-display.tentative.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-anchor-multicol-display.tentative.html
@@ -52,11 +52,10 @@
           <div class="spacer" style="height: 10px"></div>
           <div id="anchor1"></div>
         </div>
-        <div class="target" popover anchor="anchor1"
-          data-expected-height=50></div>
+        <div class="target" popover anchor="anchor1" data-expected-height=30></div>
       </div>
+      <div class="target" popover anchor="anchor1" data-expected-height=50></div>
     </div>
   </div>
-
 </body>
 
diff --git a/tests/wpt/tests/html/semantics/popovers/resources/popover-utils.js b/tests/wpt/tests/html/semantics/popovers/resources/popover-utils.js
index 7878b125f2f..2790e7e039e 100644
--- a/tests/wpt/tests/html/semantics/popovers/resources/popover-utils.js
+++ b/tests/wpt/tests/html/semantics/popovers/resources/popover-utils.js
@@ -143,13 +143,21 @@ function assertNotAPopover(nonPopover) {
 async function verifyFocusOrder(order,description) {
   order[0].focus();
   for(let i=0;i<order.length;++i) {
+    // Press tab between each check, excluding first (because it should already be focused)
+    // and the last (because tabbing after the last element may send focus into browser chrome).
+    if (i != 0) {
+      await sendTab();
+    }
     const control = order[i];
     assert_equals(document.activeElement,control,`${description}: Step ${i+1}`);
-    await sendTab();
   }
   for(let i=order.length-1;i>=0;--i) {
     const control = order[i];
-    await sendShiftTab();
     assert_equals(document.activeElement,control,`${description}: Step ${i+1} (backwards)`);
+    // Press shift+tab between each check, excluding last (because it should already be focused)
+    // and the first (because shift+tabbing after the last element may send focus into browser chrome).
+    if (i != 0) {
+      await sendShiftTab();
+    }
   }
 }
diff --git a/tests/wpt/tests/html/semantics/scripting-1/META.yml b/tests/wpt/tests/html/semantics/scripting-1/META.yml
index 0f3cf596537..37db4138147 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/META.yml
+++ b/tests/wpt/tests/html/semantics/scripting-1/META.yml
@@ -1,2 +1,2 @@
 suggested_reviewers:
-  - domenic
+  - hiroshige-g
diff --git a/tests/wpt/tests/import-maps/META.yml b/tests/wpt/tests/import-maps/META.yml
index dbcc70edabb..ab3e77b6918 100644
--- a/tests/wpt/tests/import-maps/META.yml
+++ b/tests/wpt/tests/import-maps/META.yml
@@ -1,4 +1,3 @@
-spec: https://wicg.github.io/import-maps/
+spec: https://html.spec.whatwg.org/multipage/webappapis.html#import-maps
 suggested_reviewers:
-  - domenic
   - hiroshige-g
diff --git a/tests/wpt/tests/interfaces/SVG.idl b/tests/wpt/tests/interfaces/SVG.idl
index 5dff2947b51..55c1f5869c9 100644
--- a/tests/wpt/tests/interfaces/SVG.idl
+++ b/tests/wpt/tests/interfaces/SVG.idl
@@ -179,7 +179,7 @@ interface SVGAnimatedAngle {
 
 [Exposed=Window]
 interface SVGAnimatedString {
-           attribute DOMString baseVal;
+           attribute (DOMString or TrustedScriptURL) baseVal;
   readonly attribute DOMString animVal;
 };
 
@@ -245,16 +245,16 @@ interface SVGSVGElement : SVGGraphicsElement {
 
   undefined deselectAll();
 
-  SVGNumber createSVGNumber();
-  SVGLength createSVGLength();
-  SVGAngle createSVGAngle();
-  DOMPoint createSVGPoint();
-  DOMMatrix createSVGMatrix();
-  DOMRect createSVGRect();
-  SVGTransform createSVGTransform();
-  SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
+  [NewObject] SVGNumber createSVGNumber();
+  [NewObject] SVGLength createSVGLength();
+  [NewObject] SVGAngle createSVGAngle();
+  [NewObject] DOMPoint createSVGPoint();
+  [NewObject] DOMMatrix createSVGMatrix();
+  [NewObject] DOMRect createSVGRect();
+  [NewObject] SVGTransform createSVGTransform();
+  [NewObject] SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
 
-  Element getElementById(DOMString elementId);
+  Element? getElementById(DOMString elementId);
 
   // Deprecated methods that have no effect when called,
   // but which are kept for compatibility reasons.
@@ -333,6 +333,7 @@ interface SVGStyleElement : SVGElement {
   attribute DOMString type;
   attribute DOMString media;
   attribute DOMString title;
+  attribute boolean disabled;
 };
 
 SVGStyleElement includes LinkStyle;
@@ -575,6 +576,7 @@ interface SVGMarkerElement : SVGElement {
   const unsigned short SVG_MARKER_ORIENT_UNKNOWN = 0;
   const unsigned short SVG_MARKER_ORIENT_AUTO = 1;
   const unsigned short SVG_MARKER_ORIENT_ANGLE = 2;
+  const unsigned short SVG_MARKER_ORIENT_AUTO_START_REVERSE = 3;
 
   [SameObject] readonly attribute SVGAnimatedLength refX;
   [SameObject] readonly attribute SVGAnimatedLength refY;
@@ -662,8 +664,6 @@ interface SVGAElement : SVGGraphicsElement {
   attribute DOMString hreflang;
   attribute DOMString type;
 
-  attribute DOMString text;
-
   attribute DOMString referrerPolicy;
 };
 
diff --git a/tests/wpt/tests/interfaces/body-tracking.idl b/tests/wpt/tests/interfaces/body-tracking.idl
new file mode 100644
index 00000000000..fdc4a467154
--- /dev/null
+++ b/tests/wpt/tests/interfaces/body-tracking.idl
@@ -0,0 +1,107 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Body Tracking Module - Level 1 (https://immersive-web.github.io/body-tracking/)
+
+partial interface XRFrame {
+   [SameObject] readonly attribute XRBody? body;
+};
+
+enum XRBodyJoint {
+  "hips",
+  "spine-lower",
+  "spine-middle",
+  "spine-upper",
+  "chest",
+  "neck",
+  "head",
+  "left-shoulder",
+  "left-scapula",
+  "left-arm-upper",
+  "left-arm-lower",
+  "left-hand-wrist-twist",
+  "right-shoulder",
+  "right-scapula",
+  "right-arm-upper",
+  "right-arm-lower",
+  "right-hand-wrist-twist",
+  "left-hand-palm",
+  "left-hand-wrist",
+  "left-hand-thumb-metacarpal",
+  "left-hand-thumb-phalanx-proximal",
+  "left-hand-thumb-phalanx-distal",
+  "left-hand-thumb-tip",
+  "left-hand-index-metacarpal",
+  "left-hand-index-phalanx-proximal",
+  "left-hand-index-phalanx-intermediate",
+  "left-hand-index-phalanx-distal",
+  "left-hand-index-tip",
+  "left-hand-middle-phalanx-metacarpal",
+  "left-hand-middle-phalanx-proximal",
+  "left-hand-middle-phalanx-intermediate",
+  "left-hand-middle-phalanx-distal",
+  "left-hand-middle-tip",
+  "left-hand-ring-metacarpal",
+  "left-hand-ring-phalanx-proximal",
+  "left-hand-ring-phalanx-intermediate",
+  "left-hand-ring-phalanx-distal",
+  "left-hand-ring-tip",
+  "left-hand-little-metacarpal",
+  "left-hand-little-phalanx-proximal",
+  "left-hand-little-phalanx-intermediate",
+  "left-hand-little-phalanx-distal",
+  "left-hand-little-tip",
+  "right-hand-palm",
+  "right-hand-wrist",
+  "right-hand-thumb-metacarpal",
+  "right-hand-thumb-phalanx-proximal",
+  "right-hand-thumb-phalanx-distal",
+  "right-hand-thumb-tip",
+  "right-hand-index-metacarpal",
+  "right-hand-index-phalanx-proximal",
+  "right-hand-index-phalanx-intermediate",
+  "right-hand-index-phalanx-distal",
+  "right-hand-index-tip",
+  "right-hand-middle-metacarpal",
+  "right-hand-middle-phalanx-proximal",
+  "right-hand-middle-phalanx-intermediate",
+  "right-hand-middle-phalanx-distal",
+  "right-hand-middle-tip",
+  "right-hand-ring-metacarpal",
+  "right-hand-ring-phalanx-proximal",
+  "right-hand-ring-phalanx-intermediate",
+  "right-hand-ring-phalanx-distal",
+  "right-hand-ring-tip",
+  "right-hand-little-metacarpal",
+  "right-hand-little-phalanx-proximal",
+  "right-hand-little-phalanx-intermediate",
+  "right-hand-little-phalanx-distal",
+  "right-hand-little-tip",
+  "left-upper-leg",
+  "left-lower-leg",
+  "left-foot-ankle-twist",
+  "left-foot-ankle",
+  "left-foot-subtalar",
+  "left-foot-transverse",
+  "left-foot-ball",
+  "right-upper-leg",
+  "right-lower-leg",
+  "right-foot-ankle-twist",
+  "right-foot-ankle",
+  "right-foot-subtalar",
+  "right-foot-transverse",
+  "right-foot-ball"
+};
+
+[Exposed=Window]
+interface XRBody {
+    iterable<XRBodyJoint, XRBodySpace>;
+
+    readonly attribute unsigned long size;
+    XRBodySpace get(XRBodyJoint key);
+};
+
+[Exposed=Window]
+interface XRBodySpace: XRSpace {
+  readonly attribute XRBodyJoint jointName;
+};
diff --git a/tests/wpt/tests/interfaces/html.idl b/tests/wpt/tests/interfaces/html.idl
index 2d24206b089..3da9f21645c 100644
--- a/tests/wpt/tests/interfaces/html.idl
+++ b/tests/wpt/tests/interfaces/html.idl
@@ -137,6 +137,9 @@ interface HTMLElement : Element {
   undefined hidePopover();
   boolean togglePopover(optional (TogglePopoverOptions or boolean) options = {});
   [CEReactions] attribute DOMString? popover;
+
+  [CEReactions, Reflect, ReflectRange=(0, 8)] attribute unsigned long headingOffset;
+  [CEReactions, Reflect] attribute boolean headingReset;
 };
 
 dictionary ShowPopoverOptions {
@@ -1312,8 +1315,6 @@ typedef (HTMLOrSVGImageElement or
          OffscreenCanvas or
          VideoFrame) CanvasImageSource;
 
-enum PredefinedColorSpace { "srgb", "display-p3" };
-
 enum CanvasColorType { "unorm8", "float16" };
 
 enum CanvasFillRule { "nonzero", "evenodd" };
@@ -1612,6 +1613,8 @@ OffscreenCanvasRenderingContext2D includes CanvasPathDrawingStyles;
 OffscreenCanvasRenderingContext2D includes CanvasTextDrawingStyles;
 OffscreenCanvasRenderingContext2D includes CanvasPath;
 
+enum PredefinedColorSpace { "srgb", "display-p3" };
+
 [Exposed=Window]
 interface CustomElementRegistry {
   constructor();
diff --git a/tests/wpt/tests/interfaces/mediasession.idl b/tests/wpt/tests/interfaces/mediasession.idl
index 9c050b0efdf..8ebaeb412d1 100644
--- a/tests/wpt/tests/interfaces/mediasession.idl
+++ b/tests/wpt/tests/interfaces/mediasession.idl
@@ -34,6 +34,12 @@ enum MediaSessionAction {
   "voiceactivity"
 };
 
+enum MediaSessionEnterPictureInPictureReason {
+  "other",
+  "useraction",
+  "contentoccluded"
+};
+
 callback MediaSessionActionHandler = undefined(MediaSessionActionDetails details);
 
 [Exposed=Window]
@@ -102,4 +108,5 @@ dictionary MediaSessionActionDetails {
   double seekTime;
   boolean fastSeek;
   boolean isActivating;
+  MediaSessionEnterPictureInPictureReason enterPictureInPictureReason;
 };
diff --git a/tests/wpt/tests/interfaces/mst-content-hint.idl b/tests/wpt/tests/interfaces/mst-content-hint.idl
index a41abb55eae..f125feed12e 100644
--- a/tests/wpt/tests/interfaces/mst-content-hint.idl
+++ b/tests/wpt/tests/interfaces/mst-content-hint.idl
@@ -10,7 +10,8 @@ partial interface MediaStreamTrack {
 enum RTCDegradationPreference {
   "maintain-framerate",
   "maintain-resolution",
-  "balanced"
+  "balanced",
+  "maintain-framerate-and-resolution"
 };
 
 partial dictionary RTCRtpSendParameters {
diff --git a/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl b/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
index 2cf43b1e9bc..14dbe47f48a 100644
--- a/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
+++ b/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
@@ -51,20 +51,11 @@ dictionary AttributionConversionOptions {
   sequence<USVString> impressionSites = [];
   sequence<USVString> impressionCallers = [];
 
-  AttributionLogic logic = "last-n-touch";
-  AttributionLogicOptions logicOptions;
+  sequence<double> credit;
   unsigned long value = 1;
   unsigned long maxValue = 1;
 };
 
-enum AttributionLogic {
-  "last-n-touch",
-};
-
-dictionary AttributionLogicOptions {
-  sequence<double> credit;
-};
-
 dictionary AttributionConversionResult {
   required Uint8Array report;
 };
diff --git a/tests/wpt/tests/interfaces/push-api.idl b/tests/wpt/tests/interfaces/push-api.idl
index a1de7a416b6..99eb9e983e3 100644
--- a/tests/wpt/tests/interfaces/push-api.idl
+++ b/tests/wpt/tests/interfaces/push-api.idl
@@ -8,9 +8,11 @@ dictionary PushPermissionDescriptor : PermissionDescriptor {
 };
 
 [SecureContext]
-partial interface ServiceWorkerRegistration {
+interface mixin PushManagerAttribute {
   readonly attribute PushManager pushManager;
 };
+Window includes PushManagerAttribute;
+ServiceWorkerRegistration includes PushManagerAttribute;
 
 [Exposed=(Window,Worker), SecureContext]
 interface PushManager {
diff --git a/tests/wpt/tests/interfaces/sanitizer-api.idl b/tests/wpt/tests/interfaces/sanitizer-api.idl
index 70412cced28..502e1bfef12 100644
--- a/tests/wpt/tests/interfaces/sanitizer-api.idl
+++ b/tests/wpt/tests/interfaces/sanitizer-api.idl
@@ -19,16 +19,16 @@ interface Sanitizer {
   SanitizerConfig get();
 
   // Modify a Sanitizer’s lists and fields:
-  undefined allowElement(SanitizerElementWithAttributes element);
-  undefined removeElement(SanitizerElement element);
-  undefined replaceElementWithChildren(SanitizerElement element);
-  undefined allowAttribute(SanitizerAttribute attribute);
-  undefined removeAttribute(SanitizerAttribute attribute);
-  undefined setComments(boolean allow);
-  undefined setDataAttributes(boolean allow);
+  boolean allowElement(SanitizerElementWithAttributes element);
+  boolean removeElement(SanitizerElement element);
+  boolean replaceElementWithChildren(SanitizerElement element);
+  boolean allowAttribute(SanitizerAttribute attribute);
+  boolean removeAttribute(SanitizerAttribute attribute);
+  boolean setComments(boolean allow);
+  boolean setDataAttributes(boolean allow);
 
-  // Remove markup that executes script. May modify multiple lists:
-  undefined removeUnsafe();
+  // Remove markup that executes script.
+  boolean removeUnsafe();
 };
 
 dictionary SanitizerElementNamespace {
diff --git a/tests/wpt/tests/interfaces/svg-animations.idl b/tests/wpt/tests/interfaces/svg-animations.idl
index b57e1b9eb51..c77c70ad61a 100644
--- a/tests/wpt/tests/interfaces/svg-animations.idl
+++ b/tests/wpt/tests/interfaces/svg-animations.idl
@@ -9,7 +9,7 @@ interface TimeEvent : Event {
   readonly attribute WindowProxy? view;
   readonly attribute long detail;
 
-  undefined initTimeEvent(DOMString typeArg, Window? viewArg, long detailArg);
+  undefined initTimeEvent(DOMString typeArg, optional Window? viewArg = null, optional long detailArg = 0);
 };
 
 [Exposed=Window]
@@ -55,10 +55,6 @@ SVGMPathElement includes SVGURIReference;
 interface SVGAnimateTransformElement : SVGAnimationElement {
 };
 
-[Exposed=Window]
-interface SVGDiscardElement : SVGAnimationElement {
-};
-
 partial interface SVGSVGElement {
   undefined pauseAnimations();
   undefined unpauseAnimations();
diff --git a/tests/wpt/tests/interfaces/wasm-js-api.idl b/tests/wpt/tests/interfaces/wasm-js-api.idl
index b4f723d050a..253d9be9c24 100644
--- a/tests/wpt/tests/interfaces/wasm-js-api.idl
+++ b/tests/wpt/tests/interfaces/wasm-js-api.idl
@@ -8,25 +8,40 @@ dictionary WebAssemblyInstantiatedSource {
     required Instance instance;
 };
 
+dictionary WebAssemblyCompileOptions {
+    USVString? importedStringConstants;
+    sequence<USVString> builtins;
+};
+
 [Exposed=*]
 namespace WebAssembly {
-    boolean validate(BufferSource bytes);
-    Promise<Module> compile(BufferSource bytes);
+    boolean validate(BufferSource bytes, optional WebAssemblyCompileOptions options = {});
+    Promise<Module> compile(BufferSource bytes, optional WebAssemblyCompileOptions options = {});
 
     Promise<WebAssemblyInstantiatedSource> instantiate(
-        BufferSource bytes, optional object importObject);
+        BufferSource bytes, optional object importObject, optional WebAssemblyCompileOptions options = {});
 
     Promise<Instance> instantiate(
         Module moduleObject, optional object importObject);
+
+    readonly attribute Tag JSTag;
 };
 
 enum ImportExportKind {
   "function",
   "table",
   "memory",
-  "global"
+  "global",
+  "tag"
 };
 
+enum AddressType {
+  "i32",
+  "i64",
+};
+
+typedef any AddressValue;
+
 dictionary ModuleExportDescriptor {
   required USVString name;
   required ImportExportKind kind;
@@ -41,7 +56,7 @@ dictionary ModuleImportDescriptor {
 
 [LegacyNamespace=WebAssembly, Exposed=*]
 interface Module {
-  constructor(BufferSource bytes);
+  constructor(BufferSource bytes, optional WebAssemblyCompileOptions options = {});
   static sequence<ModuleExportDescriptor> exports(Module moduleObject);
   static sequence<ModuleImportDescriptor> imports(Module moduleObject);
   static sequence<ArrayBuffer> customSections(Module moduleObject, DOMString sectionName);
@@ -54,14 +69,15 @@ interface Instance {
 };
 
 dictionary MemoryDescriptor {
-  required [EnforceRange] unsigned long initial;
-  [EnforceRange] unsigned long maximum;
+  required AddressValue initial;
+  AddressValue maximum;
+  AddressType address;
 };
 
 [LegacyNamespace=WebAssembly, Exposed=*]
 interface Memory {
   constructor(MemoryDescriptor descriptor);
-  unsigned long grow([EnforceRange] unsigned long delta);
+  AddressValue grow(AddressValue delta);
   ArrayBuffer toFixedLengthBuffer();
   ArrayBuffer toResizableBuffer();
   readonly attribute ArrayBuffer buffer;
@@ -76,17 +92,18 @@ enum TableKind {
 
 dictionary TableDescriptor {
   required TableKind element;
-  required [EnforceRange] unsigned long initial;
-  [EnforceRange] unsigned long maximum;
+  required AddressValue initial;
+  AddressValue maximum;
+  AddressType address;
 };
 
 [LegacyNamespace=WebAssembly, Exposed=*]
 interface Table {
   constructor(TableDescriptor descriptor, optional any value);
-  unsigned long grow([EnforceRange] unsigned long delta, optional any value);
-  any get([EnforceRange] unsigned long index);
-  undefined set([EnforceRange] unsigned long index, optional any value);
-  readonly attribute unsigned long length;
+  AddressValue grow(AddressValue delta, optional any value);
+  any get(AddressValue index);
+  undefined set(AddressValue index, optional any value);
+  readonly attribute AddressValue length;
 };
 
 enum ValueType {
@@ -110,3 +127,24 @@ interface Global {
   any valueOf();
   attribute any value;
 };
+
+dictionary TagType {
+  required sequence<ValueType> parameters;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Tag {
+  constructor(TagType type);
+};
+
+dictionary ExceptionOptions {
+  boolean traceStack = false;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Exception {
+  constructor(Tag exceptionTag, sequence<any> payload, optional ExceptionOptions options = {});
+  any getArg([EnforceRange] unsigned long index);
+  boolean is(Tag exceptionTag);
+  readonly attribute (DOMString or undefined) stack;
+};
diff --git a/tests/wpt/tests/interfaces/wasm-web-api.idl b/tests/wpt/tests/interfaces/wasm-web-api.idl
index 088c8ee3a39..f19e6b156a7 100644
--- a/tests/wpt/tests/interfaces/wasm-web-api.idl
+++ b/tests/wpt/tests/interfaces/wasm-web-api.idl
@@ -5,7 +5,7 @@
 
 [Exposed=(Window,Worker)]
 partial namespace WebAssembly {
-  Promise<Module> compileStreaming(Promise<Response> source);
+  Promise<Module> compileStreaming(Promise<Response> source, optional WebAssemblyCompileOptions options = {});
   Promise<WebAssemblyInstantiatedSource> instantiateStreaming(
-      Promise<Response> source, optional object importObject);
+      Promise<Response> source, optional object importObject, optional WebAssemblyCompileOptions options = {});
 };
diff --git a/tests/wpt/tests/interfaces/webnn.idl b/tests/wpt/tests/interfaces/webnn.idl
index 3490f40e832..8820a1c5649 100644
--- a/tests/wpt/tests/interfaces/webnn.idl
+++ b/tests/wpt/tests/interfaces/webnn.idl
@@ -155,7 +155,7 @@ interface MLGraphBuilder {
                      AllowSharedBufferSource buffer);
 
   // Create a scalar operand from the specified number of the specified type.
-  MLOperand constant(MLOperandDataType type, MLNumber value);
+  MLOperand constant(MLOperandDataType dataType, MLNumber value);
 
   // Create an operand from a specified constant tensor.
   MLOperand constant(MLTensor tensor);
@@ -208,7 +208,7 @@ partial dictionary MLOpSupportLimits {
 
 partial interface MLGraphBuilder {
   MLOperand cast(MLOperand input,
-                 MLOperandDataType type,
+                 MLOperandDataType dataType,
                  optional MLOperatorOptions options = {});
 };
 
diff --git a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
index 8fa55d3cb55..3caaf72722d 100644
--- a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
+++ b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
@@ -156,7 +156,3 @@ interface KeyFrameRequestEvent : Event {
   constructor(DOMString type, optional DOMString rid);
   readonly attribute DOMString? rid;
 };
-
-partial interface RTCRtpSender {
-    Promise<undefined> generateKeyFrame(optional sequence <DOMString> rids);
-};
diff --git a/tests/wpt/tests/largest-contentful-paint/image-upscaling.html b/tests/wpt/tests/largest-contentful-paint/image-upscaling.html
index 5de0790281b..e61ecea66e4 100644
--- a/tests/wpt/tests/largest-contentful-paint/image-upscaling.html
+++ b/tests/wpt/tests/largest-contentful-paint/image-upscaling.html
@@ -72,7 +72,7 @@
     promise_test(async t => {
       const { naturalSize, lcpSize } = await load_image_and_get_lcp_size(t,
         { transform: 'scale(0.5)' });
-      assert_equals(Math.floor(lcpSize), Math.floor(naturalSize / 4));
+      assert_approx_equals(Math.floor(lcpSize), Math.floor(naturalSize / 4), 2);
     }, 'A downscaled image (using scale) should report the displayed size');
 
     promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/META.yml b/tests/wpt/tests/navigation-api/META.yml
index de4f6c9a335..a8b461a478a 100644
--- a/tests/wpt/tests/navigation-api/META.yml
+++ b/tests/wpt/tests/navigation-api/META.yml
@@ -1,4 +1,3 @@
-spec: https://wicg.github.io/navigation-api/
+spec: https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigation-api
 suggested_reviewers:
-  - domenic
   - natechapin
diff --git a/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html b/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
index 885d558bb5d..3564ede92b1 100644
--- a/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
+++ b/tests/wpt/tests/navigation-api/currententrychange-event/history-back-same-doc.html
@@ -9,7 +9,7 @@ promise_test(async t => {
   // Wait for after the load event so that the navigation doesn't get converted
   // into a replace navigation.
   await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
-  await navigation.navigate("#foo");
+  await navigation.navigate("#foo").finished;
   assert_equals(navigation.entries().length, start_length + 1);
 
   let oncurrententrychange_called = false;
diff --git a/tests/wpt/tests/navigation-api/focus-reset/change-focus-then-remove-during-intercept.html b/tests/wpt/tests/navigation-api/focus-reset/change-focus-then-remove-during-intercept.html
index a5d8062ce08..01bd6681c53 100644
--- a/tests/wpt/tests/navigation-api/focus-reset/change-focus-then-remove-during-intercept.html
+++ b/tests/wpt/tests/navigation-api/focus-reset/change-focus-then-remove-during-intercept.html
@@ -24,13 +24,10 @@ promise_test(async t => {
 
   const finished = navigation.navigate("#1").finished;
 
-  let onfocus_called = false;
-  document.body.onfocus = onfocus_called = true;
+  document.body.onfocus = t.unreached_func("onfocus shouldn't fire due to focus reset");
   button.remove();
   assert_equals(document.activeElement, document.body, "Removing the element reset focus");
-  assert_true(onfocus_called);
 
-  document.body.onfocus = t.unreached_func("onfocus shouldn't fire a second time due to focus reset");
   intercept_resolve();
   await finished;
   assert_equals(document.activeElement, document.body, "Focus remains on document.body after promise fulfills");
diff --git a/tests/wpt/tests/navigation-api/ordering-and-transition/transition-to.tentative.html b/tests/wpt/tests/navigation-api/ordering-and-transition/transition-to.tentative.html
new file mode 100644
index 00000000000..9b766ef6a8e
--- /dev/null
+++ b/tests/wpt/tests/navigation-api/ordering-and-transition/transition-to.tentative.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(async (t) => {
+  // Wait for after the load event so that the navigation doesn't get converted
+  // into a replace navigation.
+  await new Promise(r => window.onload = () => t.step_timeout(r, 0));
+  const precommit = Promise.withResolvers();
+  const handler = Promise.withResolvers();
+  const handler_done = Promise.withResolvers();
+  const commit = Promise.withResolvers();
+  navigation.addEventListener("navigate", e => {
+    e.intercept({
+        async precommitHandler() {
+            precommit.resolve(e);
+            await commit.promise;
+        },
+        async handler() {
+            handler.resolve();
+            await handler_done.promise;
+        }
+    });
+  });
+
+  assert_equals(navigation.transition, null);
+  navigation.navigate("?next");
+  const navigate_event = await precommit.promise;
+  const old_entry = navigation.currentEntry;
+  assert_equals(navigation.transition.from, old_entry);
+  assert_equals(navigation.transition.to, navigate_event.destination);
+  commit.resolve();
+  await handler.promise;
+  assert_equals(navigation.transition.from, old_entry);
+  assert_equals(navigation.transition.to, navigate_event.destination);
+  assert_equals(navigation.transition.to.url, navigation.currentEntry.url);
+  handler_done.resolve();
+}, "navigation.transition.to matches the navigate event's destination");
+</script>
diff --git a/tests/wpt/tests/navigation-api/per-entry-events/dispose-after-bfcache.html b/tests/wpt/tests/navigation-api/per-entry-events/dispose-after-bfcache.html
index 7d3ef4f81ed..fea97325c30 100644
--- a/tests/wpt/tests/navigation-api/per-entry-events/dispose-after-bfcache.html
+++ b/tests/wpt/tests/navigation-api/per-entry-events/dispose-after-bfcache.html
@@ -17,7 +17,7 @@ runBfcacheTest({
   targetOrigin: originSameOrigin,
   funcBeforeNavigation: async () => {
     window.events = [];
-    await navigation.navigate("#1");
+    await navigation.navigate("#1").finished;
     await navigation.back();
     window.originalEntry1 = navigation.entries()[1];
     window.originalEntry1.ondispose = () => events.push("dispose");
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-basic.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-basic.html
index 8ee4cc395b6..2f76b4de950 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-basic.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-basic.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html
index 6ededdeebfa..cb49f5bc589 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-change-history-scroll-restoration-during-promise.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html
index 4b7d0754747..640d4ae4dc0 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-explicit-scroll.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html
index baff6fe542b..c94578855dd 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-intercept-handler-modifies.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div id="main" style="height: 1000px; width: 1000px;"></div>
+<div id="main" style="height: 200vh; width: 200vw;"></div>
 <script>
 promise_test(async t => {
   // Wait for after the load event so that the navigation doesn't get converted
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-push.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-push.html
index f3ee1827bc4..52eaa704a28 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-push.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-push.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reject.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reject.html
index 5880dbb3313..a4cb90e74a7 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reject.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reject.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reload.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reload.html
index badb7e7f417..d3b0bee4fd7 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reload.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-reload.html
@@ -1,10 +1,11 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div id="buffer" style="height: 1000px; width: 1000px;"></div>
+<div id="buffer" style="height: 1000px; width: 200vw;"></div>
 <div id="frag"></div>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <script>
 promise_test(async t => {
   // Wait for after the load event so that the navigation doesn't get converted
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-replace.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-replace.html
index 48f153b99ef..f58f39faddd 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-replace.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-replace.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-timing.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-timing.html
index 88ba82102a6..5d01176f4bc 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-timing.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-timing.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-with-history-scroll-restoration-manual.html b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-with-history-scroll-restoration-manual.html
index bc2ce230ce7..bec62ae37ae 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-with-history-scroll-restoration-manual.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/after-transition-with-history-scroll-restoration-manual.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-basic.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-basic.html
index e6ae29ad86e..f99f315fd11 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-basic.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-basic.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-immediate-scroll.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-immediate-scroll.html
index bafcf6b2562..fd3727a53cc 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-immediate-scroll.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-immediate-scroll.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-dispatch.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-dispatch.html
index 8b4a58c7a26..c2e013ea706 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-dispatch.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-dispatch.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-resolve.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-resolve.html
index 244c93af904..7daeaaefc2c 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-resolve.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-after-resolve.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-fragment-does-not-exist.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-fragment-does-not-exist.html
index 1ca582787e2..6c57adcf56c 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-fragment-does-not-exist.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-fragment-does-not-exist.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-in-precommit-handler.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-in-precommit-handler.html
index 3f92b5276a3..b00356e5c4c 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-in-precommit-handler.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-in-precommit-handler.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-push.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-push.html
index 3c293651780..27d5ceec9fc 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-push.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-push.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-reload.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-reload.html
index 6dd3fd8a38f..f9c28fb251c 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-reload.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-reload.html
@@ -1,10 +1,11 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div id="buffer" style="height: 1000px; width: 1000px;"></div>
+<div id="buffer" style="height: 1000px; width: 200vw;"></div>
 <div id="frag"></div>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <script>
 promise_test(async t => {
   // Wait for after the load event so that the navigation doesn't get converted
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-repeated.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-repeated.html
index 12391460880..b1b4eba4dc2 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-repeated.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-repeated.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-replace.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-replace.html
index db580229a86..a6e0aa1f87e 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-replace.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-replace.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-resets-when-no-fragment.html b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-resets-when-no-fragment.html
index 5401976f640..73b0e0770e6 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-resets-when-no-fragment.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/manual-scroll-resets-when-no-fragment.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-after-preventDefault.html b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-after-preventDefault.html
index 298bebcbe98..1d3530096f9 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-after-preventDefault.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-after-preventDefault.html
@@ -1,9 +1,10 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="../navigation-methods/return-value/resources/helpers.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-on-synthetic-event.html b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-on-synthetic-event.html
index 7efc2d1d980..551cc6e4f2e 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-on-synthetic-event.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-on-synthetic-event.html
@@ -1,4 +1,5 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
diff --git a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-without-intercept.html b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-without-intercept.html
index b3958352c72..e97001e7f37 100644
--- a/tests/wpt/tests/navigation-api/scroll-behavior/scroll-without-intercept.html
+++ b/tests/wpt/tests/navigation-api/scroll-behavior/scroll-without-intercept.html
@@ -1,8 +1,9 @@
 <!doctype html>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <body>
-<div style="height: 1000px; width: 1000px;"></div>
+<div style="height: 200vh; width: 200vw;"></div>
 <div id="frag"></div>
 <script>
 promise_test(async t => {
diff --git a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
index ddc90eef8c5..bb46bbd30d5 100644
--- a/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
+++ b/tests/wpt/tests/navigation-api/state/same-document-away-and-back-location-api.html
@@ -11,7 +11,7 @@ async_test(t => {
     let start_index = entry0.index;
 
     let navState = { statevar: "state" };
-    await navigation.navigate("#1", { state: navState });
+    await navigation.navigate("#1", { state: navState }).finished;
     let entry1 = navigation.currentEntry;
 
     location.href = "#2";
diff --git a/tests/wpt/tests/notifications/cross-origin-nested.tentative.https.sub.html b/tests/wpt/tests/notifications/cross-origin-nested.tentative.https.sub.html
index 5430bee0511..563e1770f28 100644
--- a/tests/wpt/tests/notifications/cross-origin-nested.tentative.https.sub.html
+++ b/tests/wpt/tests/notifications/cross-origin-nested.tentative.https.sub.html
@@ -56,11 +56,11 @@ promise_test(async t => {
 
 promise_test(async t => {
   const result = await promises.get("child");
-  assert_equals(result.permission, "granted", `should grant the permission`);
-  assert_true(result.shown, `notification should be shown`);
+  assert_equals(result.permission, "denied", `should deny the permission`);
+  assert_false(result.shown, `notification should not be shown`);
 
   const childRequestResult = await promises.get("childRequest");
-  assert_equals(childRequestResult.permission, "granted", "should accept the permission request");
+  assert_equals(childRequestResult.permission, "denied", "should deny the permission request");
 }, "nested first party iframe");
 
 promise_test(async t => {
@@ -71,7 +71,7 @@ promise_test(async t => {
 
 promise_test(async t => {
   const result = await promises.get("childWorker");
-  assert_equals(result.permission, "granted", `should grant the permission`);
-  assert_true(result.shown, `notification should be shown`);
+  assert_equals(result.permission, "denied", `should deny the permission`);
+  assert_false(result.shown, `notification should not be shown`);
 }, "nested first party worker");
 </script>
diff --git a/tests/wpt/tests/notifications/event-onclose.https.html b/tests/wpt/tests/notifications/event-onclose.https.html
index b410e6c9a15..a689a9018b2 100644
--- a/tests/wpt/tests/notifications/event-onclose.https.html
+++ b/tests/wpt/tests/notifications/event-onclose.https.html
@@ -23,4 +23,14 @@ promise_test(async t => {
     assert_equals(Object.prototype.toString.call(event), "[object Event]")
     assert_equals(event.type, "close", "Checked the event type.")
 }, "Invoked the onclose event handler.")
+
+promise_test(async t => {
+    const notification = new Notification("New Email Received")
+    notification.close()
+    const event = await new Promise((resolve) => {
+        notification.onclose = resolve;
+        notification.onerror = resolve
+    })
+    assert_equals(event.type, "close", "Checked the event type.")
+}, "Invoked the onclose event handler on immediate close.")
 </script>
diff --git a/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-allowed.tentative.sub.https.window.js b/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-allowed.tentative.sub.https.window.js
index 488fee084b3..7956892f414 100644
--- a/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-allowed.tentative.sub.https.window.js
+++ b/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-allowed.tentative.sub.https.window.js
@@ -43,7 +43,8 @@ async_test(t => {
         break;
     }
   }));
-
+  // This doesn't work as intended in most cases.
+  // See https://github.com/privacycg/storage-access/issues/162.
   MaybeSetStorageAccess("*", "*", "allowed").then(() => {
     // Step 2
     window.open("https://{{hosts[alt][]}}:{{ports[https][0]}}/partitioned-popins/resources/partitioned-popins.cookies-window.html?id="+id, '_blank', 'popup');
diff --git a/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-blocked.tentative.sub.https.window.js b/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-blocked.tentative.sub.https.window.js
index 70e189761cf..9d668307791 100644
--- a/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-blocked.tentative.sub.https.window.js
+++ b/tests/wpt/tests/partitioned-popins/partitioned-popins.cookies-blocked.tentative.sub.https.window.js
@@ -43,7 +43,8 @@ async_test(t => {
         break;
     }
   }));
-
+  // This doesn't work as intended in most cases.
+  // See https://github.com/privacycg/storage-access/issues/162.
   MaybeSetStorageAccess("*", "*", "blocked").then(() => {
     // Step 2
     window.open("https://{{hosts[alt][]}}:{{ports[https][0]}}/partitioned-popins/resources/partitioned-popins.cookies-window.html?id="+id, '_blank', 'popup');
diff --git a/tests/wpt/tests/pointerevents/pointerevent_click_is_a_pointerevent.html b/tests/wpt/tests/pointerevents/pointerevent_click_is_a_pointerevent.html
index 9087a42436e..33c05abaf67 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_click_is_a_pointerevent.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_click_is_a_pointerevent.html
@@ -76,25 +76,6 @@ promise_test(async test => {
 }, "click using " + pointer_type + " is a PointerEvent with correct properties"
     + " when no other PointerEvent listeners are present");
 
-promise_test(async test => {
-  await subframe_loaded;
-
-  const target = frames[0];
-  let pointerdown_promise = getEvent("pointerdown", target, test);
-  let pointerup_promise = getEvent("pointerup", target, test);
-  let click_promise = getEvent("click", target, test);
-
-  await clickInTarget(pointer_type, frames[0].document.body);
-
-  let pointerdown_event = await pointerdown_promise;
-  let pointerup_event = await pointerup_promise;
-  let click_event = await click_promise;
-
-  assertClickProperties(click_event, frames[0], pointerdown_event, pointerup_event);
-}, "click using " + pointer_type + " is a PointerEvent with correct properties"
-    + " in a subframe");
-
-
 // Run this part of the test only once, since it doesn't rely on the pointer_type.
 if (pointer_type == "mouse") {
   promise_test(async test => {
@@ -120,4 +101,25 @@ if (pointer_type == "mouse") {
   }, "click using " + pointer_type + " is a PointerEvent with correct properties"
       + " using non-pointing device");
 }
+
+promise_test(async test => {
+  // This subtest must be run last as workaround for a WebKit issue where webdriver
+  // fails to correctly direct focus after clicking outside of the frame. This bug
+  // does not occur during normal browsing. https://webkit.org/b/298676
+  await subframe_loaded;
+
+  const target = frames[0];
+  let pointerdown_promise = getEvent("pointerdown", target, test);
+  let pointerup_promise = getEvent("pointerup", target, test);
+  let click_promise = getEvent("click", target, test);
+
+  await clickInTarget(pointer_type, frames[0].document.body);
+
+  let pointerdown_event = await pointerdown_promise;
+  let pointerup_event = await pointerup_promise;
+  let click_event = await click_promise;
+
+  assertClickProperties(click_event, frames[0], pointerdown_event, pointerup_event);
+}, "click using " + pointer_type + " is a PointerEvent with correct properties"
+    + " in a subframe");
 </script>
diff --git a/tests/wpt/tests/pointerevents/pointerevent_touch-propagates-when-target-is-video_touch.html b/tests/wpt/tests/pointerevents/pointerevent_touch-propagates-when-target-is-video_touch.html
new file mode 100644
index 00000000000..47d1f4652d8
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_touch-propagates-when-target-is-video_touch.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Touch-generated events should propagate to the parent when a video element is the target</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<div id="log"></div>
+
+<div id="parent">
+  <video controls="" preload="auto" width="480" height="320"></video>
+</div>
+
+<script>
+const parent = document.getElementById('parent');
+const video = document.querySelector('video');
+
+const xPosition = Math.ceil(video.offsetLeft + 2);
+const yPosition = Math.ceil(video.offsetTop + 2);
+
+promise_test(async t => {
+  await new Promise(r => {
+    const expectedEventLog = ['touchstart-VIDEO', 'touchmove-VIDEO', 'touchend-VIDEO'];
+    const eventLogRecorder = [];
+    const eventNames = ['touchstart', 'touchmove', 'touchend'];
+
+    for (eventName of eventNames) {
+      parent.addEventListener(eventName, event => {
+        eventLogRecorder.push(`${event.type}-${event.target.nodeName}`);
+        if (event.type === 'touchend') {
+          assert_array_equals(eventLogRecorder, expectedEventLog);
+          r();
+        }
+      });
+    }
+    let actions = new test_driver.Actions();
+    actions
+      .addPointer("touchPointer", "touch")
+      .setPointer("touchPointer")
+      .pointerMove(xPosition, yPosition)
+      .pointerDown()
+      .pointerMove(3, 3, video)
+      .pointerUp()
+      .send();
+  });
+});
+</script>
diff --git a/tests/wpt/tests/resources/testdriver.js b/tests/wpt/tests/resources/testdriver.js
index 5b390dedeb7..0366e476c1a 100644
--- a/tests/wpt/tests/resources/testdriver.js
+++ b/tests/wpt/tests/resources/testdriver.js
@@ -2169,6 +2169,32 @@
          */
         clear_display_features: function(context=null) {
             return window.test_driver_internal.clear_display_features(context);
+        },
+
+        /**
+         * Gets the current globally-applied privacy control status
+         *
+         * @returns {Promise} Fulfils with an object with boolean property `gpc`
+         *                    that encodes the current "do not sell or share"
+         *                    signal the browser is configured to convey.
+         */
+        get_global_privacy_control: function() {
+            return window.test_driver_internal.get_global_privacy_control();
+        },
+
+        /**
+         * Gets the current globally-applied privacy control status
+         *
+         * @param {bool} newValue - The a boolean that is true if the browers
+         *                          should convey a "do not sell or share" signal
+         *                          and false otherwise
+         *
+         * @returns {Promise} Fulfils with an object with boolean property `gpc`
+         *                    that encodes the new "do not sell or share"
+         *                    after applying the new value.
+         */
+        set_global_privacy_control: function(newValue) {
+            return window.test_driver_internal.set_global_privacy_control(newValue);
         }
     };
 
@@ -2486,6 +2512,14 @@
 
         async clear_display_features(context=null) {
             throw new Error("clear_display_features() is not implemented by testdriver-vendor.js");
+        },
+
+        async set_global_privacy_control(newValue) {
+            throw new Error("set_global_privacy_control() is not implemented by testdriver-vendor.js");
+        },
+
+        async get_global_privacy_control() {
+            throw new Error("get_global_privacy_control() is not implemented by testdriver-vendor.js");
         }
     };
 })();
diff --git a/tests/wpt/tests/sanitizer-api/sanitizer-basic-filtering.tentative.html b/tests/wpt/tests/sanitizer-api/sanitizer-basic-filtering.tentative.html
index 0be3604ecfe..2e61a9ab9b4 100644
--- a/tests/wpt/tests/sanitizer-api/sanitizer-basic-filtering.tentative.html
+++ b/tests/wpt/tests/sanitizer-api/sanitizer-basic-filtering.tentative.html
@@ -151,19 +151,6 @@ a <!-- comment --> b
 |   data-y="2"
 |   data-z="3"
 
-
-#data
-<p data-x="1" data-y="2" data-z="3">
-#config
-{
-  "removeAttributes": ["data-z"],
-  "dataAttributes": true
-}
-#document
-| <p>
-|   data-x="1"
-|   data-y="2"
-
 #data
 <p data-x="1" data-y="2" data-z="3">
 #config
diff --git a/tests/wpt/tests/sanitizer-api/sanitizer-config.tentative.html b/tests/wpt/tests/sanitizer-api/sanitizer-config.tentative.html
index a782b5a7e07..708139106f7 100644
--- a/tests/wpt/tests/sanitizer-api/sanitizer-config.tentative.html
+++ b/tests/wpt/tests/sanitizer-api/sanitizer-config.tentative.html
@@ -48,9 +48,11 @@ test(t => {
 
 test(t => {
   assert_false(new Sanitizer().get().dataAttributes);
-  assert_true(new Sanitizer({}).get().dataAttributes);
-  assert_true(new Sanitizer({dataAttributes: true}).get().dataAttributes);
-  assert_false(new Sanitizer({dataAttributes: false}).get().dataAttributes);
+  assert_true(new Sanitizer({ attributes: [] }).get().dataAttributes);
+  assert_false('dataAttributes' in new Sanitizer({}).get());
+  assert_false('dataAttributes' in new Sanitizer({ removeAttributes: [] }).get());
+  assert_true(new Sanitizer({ attributes: [], dataAttributes: true}).get().dataAttributes);
+  assert_false(new Sanitizer({ attributes: [], dataAttributes: false}).get().dataAttributes);
 
   let s = new Sanitizer();
   s.setDataAttributes(true);
diff --git a/tests/wpt/tests/sanitizer-api/sanitizer-modifiers.tentative.html b/tests/wpt/tests/sanitizer-api/sanitizer-modifiers.tentative.html
new file mode 100644
index 00000000000..de242660257
--- /dev/null
+++ b/tests/wpt/tests/sanitizer-api/sanitizer-modifiers.tentative.html
@@ -0,0 +1,660 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+function is_same_sanitizer_name(a, b) {
+  return a.name === b.name && a.namespace === b.namespace;
+}
+
+// https://pr-preview.s3.amazonaws.com/otherdaniel/purification/pull/296.html#sanitizerconfig-valid
+function assert_config_is_valid(config) {
+  // The config has either an elements or a removeElements key, but not both.
+  assert_false(
+    "elements" in config && "removeElements" in config,
+    "Either elements or a removeElements, but not both",
+  );
+  assert_true(
+    "elements" in config || "removeElements" in config,
+    "Either elements or a removeElements",
+  );
+
+  // The config has either an attributes or a removeAttributes key, but not both.
+  assert_false(
+    "attributes" in config && "removeAttributes" in config,
+    "Either attributes or a removeAttributes, but not both",
+  );
+  assert_true(
+    "attributes" in config || "removeAttributes" in config,
+    "Either attributes or removeAttributes",
+  );
+
+  // If both config[elements] and config[replaceWithChildrenElements] exist, then the difference of config[elements] and config[replaceWithChildrenElements] is empty.
+  if (config.elements && config.replaceWithChildrenElements) {
+    for (let element of config.elements) {
+      assert_false(
+        config.replaceWithChildrenElements.some((replaceElement) =>
+          is_same_sanitizer_name(element, replaceElement),
+        ),
+        `replaceWithChildrenElements should not contain ${element.name}`,
+      );
+    }
+  }
+
+  // If both config[removeElements] and config[replaceWithChildrenElements] exist, then the difference of config[removeElements] and config[replaceWithChildrenElements] is empty.
+  if (config.removeElements && config.replaceWithChildrenElements) {
+    for (let removeElement of config.removeElements) {
+      assert_false(
+        config.replaceWithChildrenElements.some((replaceElement) =>
+          is_same_sanitizer_name(removeElement, replaceElement),
+        ),
+        `replaceWithChildrenElements should not contain ${removeElement.name}`,
+      );
+    }
+  }
+
+  // If config[attributes] exists:
+  if (config.attributes) {
+  } else {
+    // config[dataAttributes] does not exist.
+    assert_false("dataAttributes" in config, "dataAttributes does not exist");
+  }
+}
+
+function assert_config(config, expected) {
+  const PROPERTIES = [
+    "attributes",
+    "removeAttributes",
+    "elements",
+    "removeElements",
+    "replaceWithChildrenElements",
+    "comments",
+    "dataAttributes",
+  ];
+
+  // Prevent some typos in the expected config.
+  for (let key of Object.keys(expected)) {
+    assert_in_array(key, PROPERTIES, "expected");
+  }
+  for (let key of Object.keys(config)) {
+    assert_in_array(key, PROPERTIES, "config");
+  }
+
+  assert_config_is_valid(config);
+
+  // XXX dataAttributes
+  // XXX comments
+  // XXX duplications
+  // XXX other consistency checks
+
+  function assert_attrs(key, config, expected, prefix = "config") {
+    // XXX we allow specifying only a subset for expected.
+    if (!(key in expected)) {
+      return;
+    }
+
+    if (expected[key] === undefined) {
+      assert_false(key in config, `Unexpected '${key}' in ${prefix}`);
+      return;
+    }
+
+    assert_true(key in config, `Missing '${key}' from ${prefix}`);
+    assert_equals(config[key]?.length, expected[key].length, `${prefix}.${key}.length`);
+    for (let i = 0; i < expected[key].length; i++) {
+      let attribute = expected[key][i];
+      if (typeof attribute === "string") {
+        assert_object_equals(
+          config[key][i],
+          { name: attribute, namespace: null },
+          `${prefix}.${key}[${i}] should match`,
+        );
+      } else {
+        assert_object_equals(
+          config[key][i],
+          attribute,
+          `${prefix}.${key}[${i}] should match`,
+        );
+      }
+    }
+  }
+
+  assert_attrs("attributes", config, expected);
+  assert_attrs("removeAttributes", config, expected);
+
+  function assert_elems(key) {
+    if (!(key in expected)) {
+      return;
+    }
+
+    if (expected[key] === undefined) {
+      assert_false(key in config, `Unexpected '${key}' in config`);
+      return;
+    }
+
+    assert_true(key in config, `Missing '${key}' from config`);
+    assert_equals(config[key]?.length, expected[key].length, `${key}.length`);
+
+    const XHTML_NS = "http://www.w3.org/1999/xhtml";
+
+    for (let i = 0; i < expected[key].length; i++) {
+      let element = expected[key][i];
+      if (typeof element === "string") {
+        assert_object_equals(
+          config[key][i],
+          { name: element, namespace: XHTML_NS },
+          `${key}[${i}] should match`,
+        );
+      } else {
+        if (key === "elements") {
+          assert_equals(config[key][i].name, element.name, `${key}[${i}].name should match`);
+          let ns = "namespace" in element ? element.namespace : XHTML_NS;
+          assert_equals(config[key][i].namespace, ns, `${key}[${i}].namespace should match`);
+
+          assert_attrs("attributes", config[key][i], element, `config.elements[${i}]`);
+          assert_attrs("removeAttributes", config[key][i], element, `config.elements[${i}]`);
+        } else {
+          assert_object_equals(config[key][i], element, `${key}[${i}] should match`);
+        }
+      }
+    }
+  }
+
+  assert_elems("elements");
+  assert_elems("removeElements");
+  assert_elems("replaceWithChildrenElements");
+}
+
+const NS = "http://example.org/";
+
+test(() => {
+  let s = new Sanitizer({ attributes: [] });
+
+  assert_true(s.allowAttribute("id"));
+  assert_config(s.get(), { attributes: ["id"] });
+
+  assert_false(s.allowAttribute({ name: "id", namespace: null }));
+  assert_config(s.get(), { attributes: ["id"] });
+
+  assert_true(s.allowAttribute({ name: "id", namespace: NS }));
+  assert_config(s.get(), {
+    attributes: ["id", { name: "id", namespace: NS }],
+    removeElements: [],
+  });
+}, "sanitizer.allowAttribute() with global attributes");
+
+test(() => {
+  let s = new Sanitizer({ removeAttributes: ["title"] });
+
+  assert_false(s.allowAttribute("id"));
+  assert_config(s.get(), { removeAttributes: ["title"] });
+
+  assert_false(s.allowAttribute({ name: "title", namespace: NS }));
+  assert_config(s.get(), { removeAttributes: ["title"] });
+
+  assert_true(s.allowAttribute("title"));
+  assert_config(s.get(), { removeAttributes: [] });
+}, "sanitizer.allowAttribute() with global removeAttributes");
+
+test(() => {
+  let s = new Sanitizer({
+    attributes: [],
+    elements: [{ name: "id", attributes: ["href", { name: "title", namespace: NS }] }],
+  });
+
+  assert_true(s.allowAttribute("class"));
+  assert_config(s.get(), { attributes: ["class"] });
+
+  assert_false(s.allowAttribute("class"));
+  assert_config(s.get(), { attributes: ["class"] });
+
+  assert_true(s.allowAttribute("title"));
+  assert_config(s.get(), {
+    attributes: ["class", "title"],
+    elements: [{ name: "id", attributes: ["href", { name: "title", namespace: NS }] }],
+  });
+
+  assert_true(s.allowAttribute({ name: "title", namespace: NS }));
+  assert_config(s.get(), {
+    attributes: ["class", "title", { name: "title", namespace: NS }],
+    elements: [{ name: "id", attributes: ["href"] }],
+  });
+
+  assert_false(s.allowAttribute({ name: "title", namespace: NS }));
+  assert_config(s.get(), {
+    attributes: ["class", "title", { name: "title", namespace: NS }],
+    elements: [{ name: "id", attributes: ["href"] }],
+  });
+}, "sanitizer.allowAttribute() with global attributes and elements");
+
+test(() => {
+  const ELEMENTS = [{ name: "div", attributes: ["href"], removeAttributes: ["title"] }];
+
+  let s = new Sanitizer({
+    removeAttributes: ["id"],
+    elements: ELEMENTS,
+  });
+
+  assert_false(s.allowAttribute("class"));
+  assert_config(s.get(), {
+    removeAttributes: ["id"],
+    elements: ELEMENTS,
+  });
+
+  assert_true(s.allowAttribute("id"));
+  assert_config(s.get(), {
+    removeAttributes: [],
+    elements: ELEMENTS,
+  });
+
+  assert_false(s.allowAttribute("href"));
+  assert_config(s.get(), {
+    removeAttributes: [],
+    elements: ELEMENTS,
+  });
+
+  assert_false(s.allowAttribute("title"));
+  assert_config(s.get(), {
+    removeAttributes: [],
+    elements: ELEMENTS,
+  });
+}, "sanitizer.allowAttribute() with global removeAttributes and elements");
+
+test(() => {
+  let s = new Sanitizer({
+    attributes: ["id"],
+  });
+
+  assert_false(s.removeAttribute("title"));
+  assert_config(s.get(), { attributes: ["id"] });
+
+  assert_false(s.removeAttribute({ name: "id", namespace: NS }));
+  assert_config(s.get(), { attributes: ["id"] });
+
+  assert_true(s.removeAttribute("id"));
+  assert_config(s.get(), { attributes: [] });
+}, "sanitizer.removeAttribute() with global attributes");
+
+test(() => {
+  let s = new Sanitizer({
+    removeAttributes: ["id"],
+  });
+
+  assert_true(s.removeAttribute("title"));
+  assert_config(s.get(), { removeAttributes: ["id", "title"] });
+
+  assert_true(s.removeAttribute({ name: "id", namespace: NS }));
+  assert_config(s.get(), { removeAttributes: ["id", "title", { name: "id", namespace: NS }] });
+
+  assert_false(s.removeAttribute("id"));
+  assert_config(s.get(), { removeAttributes: ["id", "title", { name: "id", namespace: NS }] });
+}, "sanitizer.removeAttribute() with global removeAttributes");
+
+test(() => {
+  let s = new Sanitizer({
+    attributes: ["id", "title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["title"] }],
+  });
+
+  assert_false(s.removeAttribute("class"));
+  assert_config(s.get(), {
+    attributes: ["id", "title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["title"] }],
+  });
+
+  assert_true(s.removeAttribute("id"));
+  assert_config(s.get(), {
+    attributes: ["title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["title"] }],
+  });
+
+  assert_false(s.removeAttribute("id"));
+  assert_config(s.get(), {
+    attributes: ["title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["title"] }],
+  });
+
+  assert_true(s.removeAttribute("title"));
+  assert_config(s.get(), {
+    attributes: [],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: [] }],
+  });
+}, "sanitizer.removeAttribute() with global attributes and elements");
+
+test(() => {
+  let s = new Sanitizer({
+    removeAttributes: ["title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["id"] }],
+  });
+
+  assert_false(s.removeAttribute({ name: "title", namespace: null }));
+  assert_config(s.get(), {
+    removeAttributes: ["title"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["id"] }],
+  });
+
+  assert_true(s.removeAttribute("dir"));
+  assert_config(s.get(), {
+    removeAttributes: ["title", "dir"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: ["id"] }],
+  });
+
+  assert_true(s.removeAttribute("id"));
+  assert_config(s.get(), {
+    removeAttributes: ["title", "dir", "id"],
+    elements: [{ name: "div", attributes: ["class"], removeAttributes: [] }],
+  });
+
+  assert_true(s.removeAttribute("class"));
+  assert_config(s.get(), {
+    removeAttributes: ["title", "dir", "id", "class"],
+    elements: [{ name: "div", attributes: [], removeAttributes: [] }],
+  });
+}, "sanitizer.removeAttribute() with global removeAttributes and elements");
+
+test(() => {
+  let s = new Sanitizer({
+    elements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_false(s.removeElement("span"));
+  assert_config(s.get(), {
+    elements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_true(s.removeElement("b"));
+  assert_config(s.get(), {
+    elements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: [],
+  });
+
+  assert_true(s.removeElement("p"));
+  assert_config(s.get(), {
+    elements: [{ name: "p", namespace: NS }],
+    replaceWithChildrenElements: [],
+  });
+
+  assert_true(s.removeElement({ name: "p", namespace: NS }));
+  assert_config(s.get(), {
+    elements: [],
+    replaceWithChildrenElements: [],
+  });
+}, "sanitizer.removeElement() with global elements");
+
+test(() => {
+  let s = new Sanitizer({
+    removeElements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_false(s.removeElement("p"));
+  assert_config(s.get(), {
+    removeElements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_false(s.removeElement({ name: "p", namespace: NS }));
+  assert_config(s.get(), {
+    removeElements: ["p", { name: "p", namespace: NS }],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_true(s.removeElement("span"));
+  assert_config(s.get(), {
+    removeElements: ["p", { name: "p", namespace: NS }, "span"],
+    replaceWithChildrenElements: ["b"],
+  });
+
+  assert_true(s.removeElement("b"));
+  assert_config(s.get(), {
+    removeElements: ["p", { name: "p", namespace: NS }, "span", "b"],
+    replaceWithChildrenElements: [],
+  });
+}, "sanitizer.removeElement() with global removeElements");
+
+test(() => {
+  let s = new Sanitizer({
+    replaceWithChildrenElements: ["a"],
+    elements: ["b"],
+  });
+
+  assert_false(s.replaceElementWithChildren("a"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a"],
+    elements: ["b"],
+  });
+
+  assert_true(s.replaceElementWithChildren("span"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a", "span"],
+    elements: ["b"],
+  });
+
+  assert_true(s.replaceElementWithChildren("b"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a", "span", "b"],
+    elements: [],
+  });
+}, "sanitizer.replaceElementWithChildren() with global elements");
+
+test(() => {
+  let s = new Sanitizer({
+    replaceWithChildrenElements: ["a"],
+    removeElements: ["b"],
+  });
+
+  assert_false(s.replaceElementWithChildren("a"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a"],
+    removeElements: ["b"],
+  });
+
+  assert_true(s.replaceElementWithChildren("span"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a", "span"],
+    removeElements: ["b"],
+  });
+
+  assert_true(s.replaceElementWithChildren("b"));
+  assert_config(s.get(), {
+    replaceWithChildrenElements: ["a", "span", "b"],
+    removeElements: [],
+  });
+}, "sanitizer.replaceElementWithChildren() with global removeElements");
+
+test(() => {
+  let s = new Sanitizer({
+    elements: ["a"],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_false(s.allowElement("a"));
+  assert_config(s.get(), {
+    elements: ["a"],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_true(s.allowElement({name: "a", namespace: NS}));
+  assert_config(s.get(), {
+    elements: ["a", {name: "a", namespace: NS}],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_true(s.allowElement("b"));
+  assert_config(s.get(), {
+    elements: ["a", {name: "a", namespace: NS}, "b"],
+    replaceWithChildrenElements: []
+  });
+}, "sanitizer.allowElement() with global elements");
+
+test(() => {
+  let s = new Sanitizer({
+    removeElements: ["a"],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_false(s.allowElement("span"));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_false(s.allowElement({name: "a", namespace: NS}));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: ["b"]
+  });
+
+  assert_true(s.allowElement("b"));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: []
+  });
+
+  // If element["attributes"] or element["removeAttributes"] exists:
+  //  The user agent may report a warning to the console that this operation is not supported.
+  //  Return false.
+  assert_false(s.allowElement({name: "a", attributes: ["dir"]}));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: []
+  });
+  assert_false(s.allowElement({name: "a", removeAttributes: ["dir"]}));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: []
+  });
+  assert_false(s.allowElement({name: "a", attributes: ["title"], removeAttributes: ["dir"]}));
+  assert_config(s.get(), {
+    removeElements: ["a"],
+    replaceWithChildrenElements: []
+  });
+
+  assert_true(s.allowElement("a"));
+  assert_config(s.get(), {
+    removeElements: [],
+    replaceWithChildrenElements: []
+  });
+}, "sanitizer.allowElement() with global removeElements");
+
+test(() => {
+  let s = new Sanitizer({
+    elements: [],
+    attributes: ["id"]
+  });
+
+  assert_true(s.allowElement({name: "p", attributes: ["id", "title"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["title"], removeAttributes: undefined}]
+  });
+  // Duplicate
+  assert_false(s.allowElement({name: "p", attributes: ["id", "title"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["title"], removeAttributes: undefined}]
+  });
+
+
+  assert_true(s.allowElement({name: "p", removeAttributes: ["id", "class"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: ["id"]}]
+  })
+  // Duplicate
+  assert_false(s.allowElement({name: "p", removeAttributes: ["id", "class"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: ["id"]}]
+  })
+
+
+  assert_true(s.allowElement({name: "p", attributes: ["id", "dir"], removeAttributes: ["id", "lang"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: ["id"]}]
+  });
+  // Duplicate
+  assert_false(s.allowElement({name: "p", attributes: ["id", "dir"], removeAttributes: ["id", "lang"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: ["id"]}]
+  });
+
+
+  assert_true(s.allowElement({name: "p"}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: undefined}]
+  });
+
+  assert_false(s.allowElement("p"));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: undefined}]
+  });
+
+  // Set element["attributes"] to remove duplicates from element["attributes"].
+  assert_true(s.allowElement({name: "p", attributes: ["dir", "dir"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: undefined}]
+  });
+
+  // Set element["removeAttributes"] to remove duplicates from element["removeAttributes"].
+  assert_true(s.allowElement({name: "p", removeAttributes: ["id", "id"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: ["id"]}]
+  });
+
+  assert_true(s.allowElement({name: "p", attributes: ["dir", "dir"], removeAttributes: ["id", "id"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: ["id"]}]
+  });
+}, "sanitizer.allowElement() with global elements and attributes");
+
+test(() => {
+  let s = new Sanitizer({
+    elements: [],
+    removeAttributes: ["id"]
+  });
+
+  assert_true(s.allowElement({name: "p", attributes: ["id", "title"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["title"], removeAttributes: undefined}]
+  });
+  // Duplicate
+  assert_false(s.allowElement({name: "p", attributes: ["id", "title"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["title"], removeAttributes: undefined}]
+  });
+
+  assert_true(s.allowElement({name: "p", removeAttributes: ["id", "class"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: ["class"]}]
+  });
+  // Duplicate
+  assert_false(s.allowElement({name: "p", removeAttributes: ["id", "class"]}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: ["class"]}]
+  });
+
+  // XXX https://github.com/WICG/sanitizer-api/issues/305
+  assert_true(s.allowElement({ name: "p", attributes: ["id", "dir"], removeAttributes: ["id", "lang"] }))
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: ["lang"]}]
+  });
+  // Duplicate
+  assert_false(s.allowElement({ name: "p", attributes: ["id", "dir"], removeAttributes: ["id", "lang"] }))
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: ["dir"], removeAttributes: ["lang"]}]
+  });
+
+  assert_true(s.allowElement({name: "p"}));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: undefined}]
+  });
+
+  assert_false(s.allowElement("p"));
+  assert_config(s.get(), {
+    elements: [{name: "p", attributes: undefined, removeAttributes: undefined}]
+  });
+}, "sanitizer.allowElement() with global elements and removeAttributes");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/sanitizer-api/sanitizer-removeUnsafe.tentative.html b/tests/wpt/tests/sanitizer-api/sanitizer-removeUnsafe.tentative.html
index 7ad8253ad5f..7e50729712b 100644
--- a/tests/wpt/tests/sanitizer-api/sanitizer-removeUnsafe.tentative.html
+++ b/tests/wpt/tests/sanitizer-api/sanitizer-removeUnsafe.tentative.html
@@ -13,9 +13,9 @@ test(t => {
   s.removeUnsafe();
 
   let config = s.get();
-  assert_equals(config.elements.length, 0, "no elements");
-  assert_equals(config.replaceWithChildrenElements.length, 0, "no replaceWithChildrenElements");
-  assert_equals(config.attributes.length, 0, "no attributes");
+  assert_false('elements' in config, "no elements");
+  assert_false('replaceWithChildrenElements' in config, "no replaceWithChildrenElements");
+  assert_false('attributes' in config, "no attributes");
 
   // https://wicg.github.io/sanitizer-api/#built-in-safe-baseline-configuration
   const SAFE_BASELINE = {
@@ -83,20 +83,17 @@ test(t => {
   assert_true(before.elements.length > 0);
   assert_equals(before.elements.length, after.elements.length, "elements don't change");
 
-  // Not in default config.
-  assert_equals(before.replaceWithChildrenElements.length, 0);
-  assert_equals(after.replaceWithChildrenElements.length, 0);
-
-  assert_equals(before.removeElements.length, 0);
-  assert_equals(after.removeElements.length, 7, "removeElements are added");
-
   // None of the default config attributes are unsafe.
   assert_true(before.attributes.length > 0);
   assert_equals(before.attributes.length, after.attributes.length, "attributes don't change");
 
-  // Imeplementation defined "event handler content attributes"
-  assert_equals(before.removeAttributes.length, 0);
-  assert_true(after.removeAttributes.length > 0, "removeAttributes are added");
+  // Not in default config.
+  assert_false('replaceWithChildrenElements' in before);
+  assert_false('replaceWithChildrenElements' in after);
+  assert_false('removeElements' in before);
+  assert_false('removeElements' in after);
+  assert_false('removeAttributes' in before);
+  assert_false('removeAttributes' in after);
 }, "removeUnsafe with default config")
 </script>
 </body>
diff --git a/tests/wpt/tests/sanitizer-api/sethtml-tree-construction.sub.dat b/tests/wpt/tests/sanitizer-api/sethtml-tree-construction.sub.dat
index cfbc74d1128..b0fa658acbc 100644
--- a/tests/wpt/tests/sanitizer-api/sethtml-tree-construction.sub.dat
+++ b/tests/wpt/tests/sanitizer-api/sethtml-tree-construction.sub.dat
@@ -237,7 +237,7 @@ TypeError
 <div id='div' title='div'>DIV</div>
 #config
 {
-  "elements": [{ "name": "div", "attributes": ["id", "title"] }],
+  "elements": [{ "name": "div", "attributes": [] }],
   "removeAttributes": ["id", "title"]
 }
 #document
@@ -253,8 +253,6 @@ TypeError
 }
 #document
 | <div>
-|   id="div"
-|   title="div"
 |   "DIV"
 
 #data
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-late-attached-timeline.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-late-attached-timeline.tentative.html
index 22bcf9990b5..7b5317aa42d 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-late-attached-timeline.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-late-attached-timeline.tentative.html
@@ -78,7 +78,7 @@
         // should trigger.
         await testAnimationTrigger(test, async () => {
           target.style.animationTrigger = "trigger(--trigger, enter play-once)";
-          target.style.timelineTriggerTimeline = "--viewtimeline";
+          target.style.timelineTriggerSource = "--viewtimeline";
           await waitForAnimationFrames(5);
         }, target, ["animationstart", "animationend", "animationcancel"],
            [true, true, false]);
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-shorthand.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-shorthand.tentative.html
index bcc96189e07..51dc3611a6e 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-shorthand.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-shorthand.tentative.html
@@ -13,7 +13,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'cover',
@@ -24,7 +24,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain 20%',
       'timeline-trigger-range-end': 'contain 80%',
       'timeline-trigger-exit-range-start': 'cover 10%',
@@ -35,7 +35,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'cover',
@@ -46,7 +46,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain 20%',
       'timeline-trigger-range-end': 'contain 80%',
       'timeline-trigger-exit-range-start': 'cover 10%',
@@ -57,7 +57,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'cover',
@@ -68,7 +68,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'auto',
@@ -79,7 +79,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain 20%',
       'timeline-trigger-range-end': 'contain 80%',
       'timeline-trigger-exit-range-start': 'auto',
@@ -90,7 +90,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'auto',
@@ -101,7 +101,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain 10%',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'auto',
@@ -112,7 +112,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'contain',
       'timeline-trigger-range-end': 'contain',
       'timeline-trigger-exit-range-start': 'auto',
@@ -122,7 +122,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'alternate',
-      'timeline-trigger-timeline': 'view()',
+      'timeline-trigger-source': 'view()',
       'timeline-trigger-range-start': 'normal',
       'timeline-trigger-range-end': 'normal',
       'timeline-trigger-exit-range-start': 'auto',
@@ -132,7 +132,7 @@
     {
       'timeline-trigger-name': 'none',
       'timeline-trigger-behavior': 'repeat',
-      'timeline-trigger-timeline': 'auto',
+      'timeline-trigger-source': 'auto',
       'timeline-trigger-range-start': 'normal',
       'timeline-trigger-range-end': 'normal',
       'timeline-trigger-exit-range-start': 'auto',
@@ -142,7 +142,7 @@
     {
       'timeline-trigger-name': '--my-trigger',
       'timeline-trigger-behavior': 'once',
-      'timeline-trigger-timeline': '--my-timeline',
+      'timeline-trigger-source': '--my-timeline',
       'timeline-trigger-range-start': 'normal',
       'timeline-trigger-range-end': 'normal',
       'timeline-trigger-exit-range-start': 'auto',
@@ -153,7 +153,7 @@
     {
       'timeline-trigger-name': '--my-trigger1, --my-trigger2',
       'timeline-trigger-behavior': 'once, once',
-      'timeline-trigger-timeline': 'auto, auto',
+      'timeline-trigger-source': 'auto, auto',
       'timeline-trigger-range-start': 'normal, normal',
       'timeline-trigger-range-end': 'normal, normal',
       'timeline-trigger-exit-range-start': 'auto, auto',
@@ -165,7 +165,7 @@
     {
       'timeline-trigger-name': '--my-trigger1, --my-trigger2',
       'timeline-trigger-behavior': 'once, alternate',
-      'timeline-trigger-timeline': '--my-timeline1, --my-timeline2',
+      'timeline-trigger-source': '--my-timeline1, --my-timeline2',
       'timeline-trigger-range-start': 'contain, entry',
       'timeline-trigger-range-end': 'cover, exit',
       'timeline-trigger-exit-range-start': 'normal, contain',
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-source-parsing.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-source-parsing.tentative.html
new file mode 100644
index 00000000000..f743d3b87d0
--- /dev/null
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-source-parsing.tentative.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-trigger">
+<meta name="assert" content="timeline-trigger-source supports only the grammar '<single-timeline-trigger-source> #'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+
+test_valid_value('timeline-trigger-source', 'initial');
+test_valid_value('timeline-trigger-source', 'inherit');
+test_valid_value('timeline-trigger-source', 'unset');
+test_valid_value('timeline-trigger-source', 'revert');
+test_valid_value('timeline-trigger-source', 'auto');
+test_valid_value('timeline-trigger-source', 'none');
+test_valid_value('timeline-trigger-source', 'auto, auto');
+test_valid_value('timeline-trigger-source', 'none, none');
+test_valid_value('timeline-trigger-source', 'auto, none');
+test_valid_value('timeline-trigger-source', 'none, auto');
+test_valid_value('timeline-trigger-source', '--test');
+test_valid_value('timeline-trigger-source', '--test1, --test2');
+test_valid_value('timeline-trigger-source', '--test1, --test2, none, --test3, auto');
+
+test_invalid_value('timeline-trigger-source', 'test1');
+test_invalid_value('timeline-trigger-source', '10px');
+test_invalid_value('timeline-trigger-source', 'auto auto');
+test_invalid_value('timeline-trigger-source', 'none none');
+test_invalid_value('timeline-trigger-source', 'foo bar');
+test_invalid_value('timeline-trigger-source', '"foo" "bar"');
+test_invalid_value('timeline-trigger-source', 'rgb(1, 2, 3)');
+test_invalid_value('timeline-trigger-source', '#fefefe');
+test_invalid_value('timeline-trigger-source', '"test"');
+
+// https://drafts.csswg.org/scroll-animations-1/#scroll-notation
+//
+// timeline-trigger-source: scroll(<axis>? <scroller>?);
+// <axis> = block | inline | x | y
+// <scroller> = root | nearest | self
+test_valid_value('timeline-trigger-source', 'scroll()');
+test_valid_value('timeline-trigger-source', ' scroll() ', 'scroll()');
+test_valid_value('timeline-trigger-source', 'scroll(block)', 'scroll()');
+test_valid_value('timeline-trigger-source', 'scroll(inline)');
+test_valid_value('timeline-trigger-source', 'scroll(x)');
+test_valid_value('timeline-trigger-source', 'scroll(y)');
+test_valid_value('timeline-trigger-source', 'scroll(root)');
+test_valid_value('timeline-trigger-source', 'scroll(nearest)', 'scroll()');
+test_valid_value('timeline-trigger-source', 'scroll(self)');
+test_valid_value('timeline-trigger-source', 'scroll(inline nearest)', 'scroll(inline)');
+test_valid_value('timeline-trigger-source', 'scroll(nearest inline)', 'scroll(inline)');
+test_valid_value('timeline-trigger-source', 'scroll(block self)', 'scroll(self)');
+test_valid_value('timeline-trigger-source', 'scroll(self block)', 'scroll(self)');
+test_valid_value('timeline-trigger-source', 'scroll(y root)', 'scroll(root y)');
+
+test_invalid_value('timeline-trigger-source', 'scroll(abc root)');
+test_invalid_value('timeline-trigger-source', 'scroll(abc)');
+test_invalid_value('timeline-trigger-source', 'scroll(y abc)');
+test_invalid_value('timeline-trigger-source', 'scroll("string")');
+
+// https://drafts.csswg.org/scroll-animations-1/#view-notation
+test_valid_value('timeline-trigger-source', 'view()');
+test_valid_value('timeline-trigger-source', ' view() ', 'view()');
+test_valid_value('timeline-trigger-source', 'view(block)', 'view()');
+test_valid_value('timeline-trigger-source', 'view(inline)');
+test_valid_value('timeline-trigger-source', 'view(x)');
+test_valid_value('timeline-trigger-source', 'view(y)');
+test_valid_value('timeline-trigger-source', 'view(y 1px 2px)');
+test_valid_value('timeline-trigger-source', 'view(y 1px)');
+test_valid_value('timeline-trigger-source', 'view(y auto)', 'view(y)');
+test_valid_value('timeline-trigger-source', 'view(y auto auto)', 'view(y)');
+test_valid_value('timeline-trigger-source', 'view(y auto 1px)');
+test_valid_value('timeline-trigger-source', 'view(1px 2px y)', 'view(y 1px 2px)');
+test_valid_value('timeline-trigger-source', 'view(1px y)', 'view(y 1px)');
+test_valid_value('timeline-trigger-source', 'view(auto x)', 'view(x)');
+test_valid_value('timeline-trigger-source', 'view(1px 2px)');
+test_valid_value('timeline-trigger-source', 'view(1px)');
+test_valid_value('timeline-trigger-source', 'view(1px 1px)', 'view(1px)');
+test_valid_value('timeline-trigger-source', 'view(1px auto)');
+test_valid_value('timeline-trigger-source', 'view(auto calc(1% + 1px))');
+test_valid_value('timeline-trigger-source', 'view(2em calc(1% + 1em))');
+test_valid_value('timeline-trigger-source', 'view(auto)', 'view()');
+test_valid_value('timeline-trigger-source', 'view(auto auto)', 'view()');
+
+test_invalid_value('timeline-trigger-source', 'view(y 1px 2px 3px)');
+test_invalid_value('timeline-trigger-source', 'view(1px y 3px)');
+test_invalid_value('timeline-trigger-source', 'view(1px 2px 3px)');
+test_invalid_value('timeline-trigger-source', 'view(abc block)');
+test_invalid_value('timeline-trigger-source', 'view(abc)');
+test_invalid_value('timeline-trigger-source', 'view(y abc)');
+test_invalid_value('timeline-trigger-source', 'view("string")');
+
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-timeline-parsing.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-timeline-parsing.tentative.html
deleted file mode 100644
index 61bef268f23..00000000000
--- a/tests/wpt/tests/scroll-animations/animation-trigger/parsing/timeline-trigger-timeline-parsing.tentative.html
+++ /dev/null
@@ -1,97 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-trigger">
-<meta name="assert" content="timeline-trigger-type supports only the grammar '<single-timeline-trigger-timeline> #'.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-</head>
-<body>
-<script>
-
-test_valid_value('timeline-trigger-timeline', 'initial');
-test_valid_value('timeline-trigger-timeline', 'inherit');
-test_valid_value('timeline-trigger-timeline', 'unset');
-test_valid_value('timeline-trigger-timeline', 'revert');
-test_valid_value('timeline-trigger-timeline', 'auto');
-test_valid_value('timeline-trigger-timeline', 'none');
-test_valid_value('timeline-trigger-timeline', 'auto, auto');
-test_valid_value('timeline-trigger-timeline', 'none, none');
-test_valid_value('timeline-trigger-timeline', 'auto, none');
-test_valid_value('timeline-trigger-timeline', 'none, auto');
-test_valid_value('timeline-trigger-timeline', '--test');
-test_valid_value('timeline-trigger-timeline', '--test1, --test2');
-test_valid_value('timeline-trigger-timeline', '--test1, --test2, none, --test3, auto');
-
-test_invalid_value('timeline-trigger-timeline', 'test1');
-test_invalid_value('timeline-trigger-timeline', '10px');
-test_invalid_value('timeline-trigger-timeline', 'auto auto');
-test_invalid_value('timeline-trigger-timeline', 'none none');
-test_invalid_value('timeline-trigger-timeline', 'foo bar');
-test_invalid_value('timeline-trigger-timeline', '"foo" "bar"');
-test_invalid_value('timeline-trigger-timeline', 'rgb(1, 2, 3)');
-test_invalid_value('timeline-trigger-timeline', '#fefefe');
-test_invalid_value('timeline-trigger-timeline', '"test"');
-
-// https://drafts.csswg.org/scroll-animations-1/#scroll-notation
-//
-// timeline-trigger-timeline: scroll(<axis>? <scroller>?);
-// <axis> = block | inline | x | y
-// <scroller> = root | nearest | self
-test_valid_value('timeline-trigger-timeline', 'scroll()');
-test_valid_value('timeline-trigger-timeline', ' scroll() ', 'scroll()');
-test_valid_value('timeline-trigger-timeline', 'scroll(block)', 'scroll()');
-test_valid_value('timeline-trigger-timeline', 'scroll(inline)');
-test_valid_value('timeline-trigger-timeline', 'scroll(x)');
-test_valid_value('timeline-trigger-timeline', 'scroll(y)');
-test_valid_value('timeline-trigger-timeline', 'scroll(root)');
-test_valid_value('timeline-trigger-timeline', 'scroll(nearest)', 'scroll()');
-test_valid_value('timeline-trigger-timeline', 'scroll(self)');
-test_valid_value('timeline-trigger-timeline', 'scroll(inline nearest)', 'scroll(inline)');
-test_valid_value('timeline-trigger-timeline', 'scroll(nearest inline)', 'scroll(inline)');
-test_valid_value('timeline-trigger-timeline', 'scroll(block self)', 'scroll(self)');
-test_valid_value('timeline-trigger-timeline', 'scroll(self block)', 'scroll(self)');
-test_valid_value('timeline-trigger-timeline', 'scroll(y root)', 'scroll(root y)');
-
-test_invalid_value('timeline-trigger-timeline', 'scroll(abc root)');
-test_invalid_value('timeline-trigger-timeline', 'scroll(abc)');
-test_invalid_value('timeline-trigger-timeline', 'scroll(y abc)');
-test_invalid_value('timeline-trigger-timeline', 'scroll("string")');
-
-// https://drafts.csswg.org/scroll-animations-1/#view-notation
-test_valid_value('timeline-trigger-timeline', 'view()');
-test_valid_value('timeline-trigger-timeline', ' view() ', 'view()');
-test_valid_value('timeline-trigger-timeline', 'view(block)', 'view()');
-test_valid_value('timeline-trigger-timeline', 'view(inline)');
-test_valid_value('timeline-trigger-timeline', 'view(x)');
-test_valid_value('timeline-trigger-timeline', 'view(y)');
-test_valid_value('timeline-trigger-timeline', 'view(y 1px 2px)');
-test_valid_value('timeline-trigger-timeline', 'view(y 1px)');
-test_valid_value('timeline-trigger-timeline', 'view(y auto)', 'view(y)');
-test_valid_value('timeline-trigger-timeline', 'view(y auto auto)', 'view(y)');
-test_valid_value('timeline-trigger-timeline', 'view(y auto 1px)');
-test_valid_value('timeline-trigger-timeline', 'view(1px 2px y)', 'view(y 1px 2px)');
-test_valid_value('timeline-trigger-timeline', 'view(1px y)', 'view(y 1px)');
-test_valid_value('timeline-trigger-timeline', 'view(auto x)', 'view(x)');
-test_valid_value('timeline-trigger-timeline', 'view(1px 2px)');
-test_valid_value('timeline-trigger-timeline', 'view(1px)');
-test_valid_value('timeline-trigger-timeline', 'view(1px 1px)', 'view(1px)');
-test_valid_value('timeline-trigger-timeline', 'view(1px auto)');
-test_valid_value('timeline-trigger-timeline', 'view(auto calc(1% + 1px))');
-test_valid_value('timeline-trigger-timeline', 'view(2em calc(1% + 1em))');
-test_valid_value('timeline-trigger-timeline', 'view(auto)', 'view()');
-test_valid_value('timeline-trigger-timeline', 'view(auto auto)', 'view()');
-
-test_invalid_value('timeline-trigger-timeline', 'view(y 1px 2px 3px)');
-test_invalid_value('timeline-trigger-timeline', 'view(1px y 3px)');
-test_invalid_value('timeline-trigger-timeline', 'view(1px 2px 3px)');
-test_invalid_value('timeline-trigger-timeline', 'view(abc block)');
-test_invalid_value('timeline-trigger-timeline', 'view(abc)');
-test_invalid_value('timeline-trigger-timeline', 'view(y abc)');
-test_invalid_value('timeline-trigger-timeline', 'view("string")');
-
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-current-time.html b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-current-time.html
index 5daa459bbeb..3b2f4adcc8f 100644
--- a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-current-time.html
+++ b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-current-time.html
@@ -228,9 +228,9 @@ promise_test(async t => {
   await animation.ready;
 
   // Make the timeline inactive.
-  scroller.style.overflow = 'visible';
-  scroller.scrollTop;
-  await waitForNextFrame();
+  await runAndWaitForFrameUpdate(() => {
+    scroller.style.overflow = 'visible';
+  });
 
   assert_equals(animation.currentTime, null,
     'Current time is unresolved when the timeline is inactive.');
@@ -255,9 +255,9 @@ promise_test(async t => {
     await animation.ready;
 
     // Make the timeline inactive.
-    scroller.style.overflow = 'visible';
-    scroller.scrollTop;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      scroller.style.overflow = 'visible';
+    });
 
     assert_equals(animation.timeline.currentTime, null,
       'Current time is unresolved when the timeline is inactive.');
@@ -270,9 +270,9 @@ promise_test(async t => {
       'timeline is inactive.');
 
     // Make the timeline active.
-    scroller.style.overflow = 'auto';
-    scroller.scrollTop;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      scroller.style.overflow = 'auto';
+    });
 
     assert_percents_equal(animation.timeline.currentTime, 0,
       'Current time is resolved when the timeline is active.');
diff --git a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-playback-rate.html b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-playback-rate.html
index e7e96a27e1f..82365a593e6 100644
--- a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-playback-rate.html
+++ b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-playback-rate.html
@@ -104,10 +104,12 @@
     animation.playbackRate = 2;
     animation.play();
     await animation.ready;
-    scroller.scrollTop = 0.2 * maxScroll;
+
     // Wait for new animation frame  which allows the timeline to compute new
     // current time.
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      scroller.scrollTop = 0.2 * maxScroll;
+    });
 
     assert_percents_equal(animation.currentTime, 40,
                           'The current time should increase two times faster ' +
@@ -208,8 +210,9 @@
 
     animation.playbackRate = -1;
 
-    scroller.scrollTop = 0.8 * maxScroll;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      scroller.scrollTop = 0.8 * maxScroll;
+    });
     // -300 = 500 - 800
 
     // let timelineDiff =
@@ -219,8 +222,9 @@
     assert_percents_equal(animation.timeline.currentTime, 80);
     assert_percents_equal(animation.currentTime, 20);
 
-    scroller.scrollTop = 0.2 * maxScroll;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      scroller.scrollTop = 0.2 * maxScroll;
+    });
     // // 300 = 500 - 200
     // timelineDiff =
     //     startingTimelineTime.value - animation.timeline.currentTime.value;
@@ -259,9 +263,10 @@
 
     await animation.ready;
     assert_percents_equal(animation.currentTime, 20);
-    animation.playbackRate = 0;
-    scroller.scrollTop = 0.5 * maxScroll;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      animation.playbackRate = 0;
+      scroller.scrollTop = 0.5 * maxScroll;
+    });
 
     // Ensure that current time does not change.
     assert_percents_equal(animation.timeline.currentTime, 50);
diff --git a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-start-time.html b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-start-time.html
index d950eb8188d..6f21e8d25d7 100644
--- a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-start-time.html
+++ b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-start-time.html
@@ -41,10 +41,12 @@ promise_test(async t => {
   const animation = createScrollLinkedAnimation(t);
   const scroller = animation.timeline.source;
   const maxScroll = scroller.scrollHeight - scroller.clientHeight;
-  scroller.scrollTop = 0.2 * maxScroll;
+
   // Wait for new animation frame which allows the timeline to compute new
   // current time.
-  await waitForNextFrame();
+  await runAndWaitForFrameUpdate(() => {
+    scroller.scrollTop = 0.2 * maxScroll;
+  });
 
   // So long as a hold time is set, querying the current time will return
   // the hold time.
diff --git a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-timeline.tentative.html b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-timeline.tentative.html
index 5502e133679..17ca5d0557e 100644
--- a/tests/wpt/tests/scroll-animations/scroll-timelines/setting-timeline.tentative.html
+++ b/tests/wpt/tests/scroll-animations/scroll-timelines/setting-timeline.tentative.html
@@ -53,10 +53,12 @@ function createPausedCssAnimation(t) {
 function updateScrollPosition(timeline, offset) {
   const scroller = timeline.source;
   assert_true(!!scroller, 'source is resolved');
-  scroller.scrollTop = offset;
+
   // Wait for new animation frame which allows the timeline to compute new
   // current time.
-  return waitForNextFrame();
+  return runAndWaitForFrameUpdate(() => {
+    scroller.scrollTop = offset;
+  });
 }
 
 function assert_timeline_current_time(animation, timeline_current_time) {
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time-vertical-rl.tentative.html b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time-vertical-rl.tentative.html
index 34a9bf87858..cf1542b4a80 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time-vertical-rl.tentative.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time-vertical-rl.tentative.html
@@ -50,8 +50,9 @@
                   'Effect is inactive in the before phase');
 
     // Advance to the start offset, which triggers entry to the active phase.
-    container.scrollLeft = -600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -60,8 +61,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to the midpoint of the animation.
-    container.scrollLeft = -800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at midpoint");
     assert_percents_equal(anim.currentTime, 50,
@@ -70,9 +72,10 @@
                   'Effect at the midpoint of the active range');
 
     // Advance to the end of the animation.
-    container.scrollLeft = -1000;
-    anim.effect.updateTiming({ fill: 'forwards' });
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -1000;
+      anim.effect.updateTiming({ fill: 'forwards' });
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's currentTime at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -84,8 +87,9 @@
                   'Opacity with fill none at effect end time');
 
     // Advance to the scroll limit.
-    container.scrollLeft = -1600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -1600;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's currentTime at scroll limit");
     // Hold time set when the animation finishes, which clamps the value of
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time.tentative.html b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time.tentative.html
index e0e9c0fcd3c..7ca53eada36 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time.tentative.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-current-time.tentative.html
@@ -50,8 +50,9 @@
                   'Effect is inactive in the before phase');
 
     // Advance to the start offset, which triggers entry to the active phase.
-    container.scrollTop = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -60,8 +61,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to the midpoint of the animation.
-    container.scrollTop = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at midpoint");
     assert_percents_equal(anim.currentTime, 50,
@@ -70,8 +72,9 @@
                   'Effect at the midpoint of the active range');
 
     // Advance to the end of the animation.
-    container.scrollTop = 1000;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 1000;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's currentTime at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -80,8 +83,9 @@
                   'Effect is in the after phase at effect end time');
 
     // Advance to the scroll limit.
-    container.scrollTop = 1600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 1600;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's currentTime at scroll limit");
     // Hold time set when the animation finishes, which clamps the value of
@@ -101,8 +105,9 @@
       leading.style = null;
     });
 
-    container.scrollTop = 0;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 0;
+    });
 
     const anim = CreateViewTimelineOpacityAnimation(t, target);
     const timeline = anim.timeline;
@@ -117,8 +122,9 @@
 
 
     // Advance to midpoint
-    container.scrollTop = 100;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 100;
+    });
     assert_percents_equal(timeline.currentTime, 75,
                           "Timeline's current time at midpoint");
     assert_percents_equal(anim.currentTime, 75,
@@ -127,8 +133,9 @@
                   'Effect at the middle of the active phase');
 
     // Advance to end-offset
-    container.scrollTop = 200;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 200;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's current time at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -137,8 +144,9 @@
                   'Effect inactive at the end offset');
 
     // Advance to scroll limit.
-    container.scrollTop = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 800;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's current time at scroll limit");
     assert_percents_equal(anim.currentTime, 100,
@@ -155,8 +163,9 @@
       trailing.style = null;
     });
 
-    container.scrollTop = 0;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 0;
+    });
 
     const anim = CreateViewTimelineOpacityAnimation(t, target);
     const timeline = anim.timeline;
@@ -171,8 +180,9 @@
                   'Effect enters active phase at container start boundary');
 
     // Advance to start offset.
-    container.scrollTop = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -181,8 +191,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to midpoint.
-    container.scrollTop = 700;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 700;
+    });
     assert_percents_equal(timeline.currentTime, 25,
                           "Timeline's current time at the midpoint");
     assert_percents_equal(anim.currentTime, 25,
@@ -191,8 +202,9 @@
                   'Effect at the midpoint of the active phase');
 
     // Advance to end offset.
-    container.scrollTop = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at max scroll offset");
     assert_percents_equal(anim.currentTime, 50,
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-nested-subject.tentative.html b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-nested-subject.tentative.html
index d6481db4de9..fee9a601179 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-nested-subject.tentative.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/block-view-timeline-nested-subject.tentative.html
@@ -66,8 +66,9 @@
 
 
     // Advance to the start offset, which triggers entry to the active phase.
-    container.scrollTop = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -76,8 +77,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to the midpoint of the animation.
-    container.scrollTop = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at midpoint");
     assert_percents_equal(anim.currentTime, 50,
@@ -86,8 +88,9 @@
                   'Effect at the midpoint of the active range');
 
     // Advance to the end of the animation.
-    container.scrollTop = 1000;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 1000;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's currentTime at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -96,8 +99,9 @@
                   'Effect is in the after phase at effect end time');
 
     // Advance to the scroll limit.
-    container.scrollTop = 1600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 1600;
+    });
     assert_percents_equal(timeline.currentTime, 225,
                           "Timeline's currentTime at scroll limit");
     // Hold time set when the animation finishes, which clamps the value of
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/inline-subject.html b/tests/wpt/tests/scroll-animations/view-timelines/inline-subject.html
index 6b1d216dea1..e70e9ba53ea 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/inline-subject.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/inline-subject.html
@@ -40,9 +40,10 @@
     await anim.ready;
     assert_equals(getComputedStyle(anim.effect.target)
         .backgroundColor, 'rgb(0, 0, 255)');
-    scroller.scrollTop =
-        scroller.scrollHeight - scroller.clientHeight;
-    await waitForNextFrame();
+
+    await runAndWaitForFrameUpdate(() => {
+      scroller.scrollTop = scroller.scrollHeight - scroller.clientHeight;
+    });
     assert_equals(getComputedStyle(anim.effect.target)
           .backgroundColor, 'rgb(0, 128, 0)');
   }, 'View timeline attached to SVG graphics element');
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/inline-view-timeline-current-time.tentative.html b/tests/wpt/tests/scroll-animations/view-timelines/inline-view-timeline-current-time.tentative.html
index fc7a59c18fe..a4b22da5bb3 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/inline-view-timeline-current-time.tentative.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/inline-view-timeline-current-time.tentative.html
@@ -44,8 +44,9 @@
 </body>
 <script type="text/javascript">
   promise_test(async t => {
-    container.scrollLeft = 0;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 0;
+    });
 
     const anim = CreateViewTimelineOpacityAnimation(t, target,
                                                     {
@@ -65,8 +66,9 @@
                   'Effect is inactive in the before phase');
 
     // Advance to the start offset, which triggers entry to the active phase.
-    container.scrollLeft = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -75,8 +77,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to the midpoint of the animation.
-    container.scrollLeft = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at midpoint");
     assert_percents_equal(anim.currentTime, 50,
@@ -85,8 +88,9 @@
                   'Effect at the midpoint of the active range');
 
     // Advance to the end of the animation.
-    container.scrollLeft = 1000;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 1000;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's currentTime at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -95,8 +99,9 @@
                   'Effect is in the after phase at effect end time');
 
     // Advance to the scroll limit.
-    container.scrollLeft = 1600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 1600;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's currentTime at scroll limit");
     // Hold time set when the animation finishes, which clamps the value of
@@ -118,8 +123,9 @@
       content.style = null;
     });
 
-    container.scrollLeft = 0;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 0;
+    });
 
     const anim = CreateViewTimelineOpacityAnimation(t, target,
                                                     {
@@ -138,8 +144,9 @@
 
 
     // Advance to midpoint
-    container.scrollLeft = 100;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 100;
+    });
     assert_percents_equal(timeline.currentTime, 75,
                           "Timeline's current time at the midpoint");
     assert_percents_equal(anim.currentTime, 75,
@@ -148,8 +155,9 @@
                   'Effect at the midpoint of the active phase');
 
     // Advance to end-offset
-    container.scrollLeft = 200;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 200;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's current time at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -158,8 +166,9 @@
                   'Effect at the end of the active phase');
 
     // Advance to scroll limit.
-    container.scrollLeft = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 800;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's current time at the scroll limit");
     assert_percents_equal(anim.currentTime, 100,
@@ -178,8 +187,9 @@
       content.style = null;
     });
 
-    container.scrollLeft = 0;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 0;
+    });
 
     const anim = CreateViewTimelineOpacityAnimation(t, target,
                                                     {
@@ -198,8 +208,9 @@
                   'Effect enters active phase at container start boundary');
 
     // Advance to start offset.
-    container.scrollLeft = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -208,8 +219,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to midpoint
-    container.scrollLeft = 700;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 700;
+    });
     assert_percents_equal(timeline.currentTime, 25,
                           "Timeline's current time at midpoint");
     assert_percents_equal(anim.currentTime, 25,
@@ -218,8 +230,9 @@
                   'Effect at the midpoint of the active phase');
 
     // Advance to end offset.
-    container.scrollLeft = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at max scroll offset");
     assert_percents_equal(anim.currentTime, 50,
@@ -256,8 +269,9 @@
                   'Effect is inactive in the before phase');
 
     // Advance to the start offset, which triggers entry to the active phase.
-    container.scrollLeft = -600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -600;
+    });
     assert_percents_equal(timeline.currentTime, 0,
                           "Timeline's current time at start offset");
     assert_percents_equal(anim.currentTime, 0,
@@ -266,8 +280,9 @@
                   'Effect at the start of the active phase');
 
     // Advance to the midpoint of the animation.
-    container.scrollLeft = -800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -800;
+    });
     assert_percents_equal(timeline.currentTime, 50,
                           "Timeline's currentTime at midpoint");
     assert_percents_equal(anim.currentTime, 50,
@@ -276,8 +291,9 @@
                   'Effect at the midpoint of the active range');
 
     // Advance to the end of the animation.
-    container.scrollLeft = -1000;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -1000;
+    });
     assert_percents_equal(timeline.currentTime, 100,
                           "Timeline's currentTime at end offset");
     assert_percents_equal(anim.currentTime, 100,
@@ -286,8 +302,9 @@
                   'Effect is in the after phase at effect end time');
 
     // Advance to the scroll limit.
-    container.scrollLeft = -1600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = -1600;
+    });
     assert_percents_equal(timeline.currentTime, 250,
                           "Timeline's currentTime at scroll limit");
     // Hold time set when the animation finishes, which clamps the value of
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-current-time-range-name.tentative.html b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-current-time-range-name.tentative.html
index c6920143ee1..953048ca7fd 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-current-time-range-name.tentative.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-current-time-range-name.tentative.html
@@ -63,8 +63,9 @@
       timeline.getCurrentTime('scroll'), 0, MAX_SCROLL,
       'Scroll aligned with scroll start');
 
-    container.scrollLeft = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 600;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('cover'), 0,
                                  MAX_SCROLL, 'Scroll aligned with cover start');
@@ -78,8 +79,9 @@
       timeline.getCurrentTime('scroll'), scroll_pct, MAX_SCROLL,
       'getCurrentTime for "scroll" range scrollLeft=600');
 
-    container.scrollLeft = 650;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 650;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('entry'), 50,
                                  MAX_SCROLL, 'Scroll at entry midpoint');
@@ -88,38 +90,43 @@
       timeline.getCurrentTime('scroll'), scroll_pct, MAX_SCROLL,
       'getCurrentTime for "scroll" range scrollLeft=650');
 
-    container.scrollLeft = 700;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 700;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('entry'), 100,
                                  MAX_SCROLL, 'Scroll at entry end');
     assert_percents_approx_equal(timeline.getCurrentTime('contain'), 0,
                                  MAX_SCROLL, 'Scroll at contain start');
 
-    container.scrollLeft = 750;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 750;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('contain'), 50,
                                  MAX_SCROLL, 'Scroll at contain midpoint');
     assert_percents_approx_equal(timeline.getCurrentTime(), 50,
                                  MAX_SCROLL, 'Scroll at timeline midpoint');
 
-    container.scrollLeft = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 800;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('exit'), 0,
                                  MAX_SCROLL, 'Scroll at exit start');
     assert_percents_approx_equal(timeline.getCurrentTime('contain'), 100,
                                  MAX_SCROLL, 'Scroll at contain end');
 
-    container.scrollLeft = 850;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 850;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('exit'), 50,
                                  MAX_SCROLL, 'Scroll at exit midpoint');
 
-    container.scrollLeft = 900;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 900;
+    });
 
     assert_percents_approx_equal(timeline.getCurrentTime('exit'), 100,
                                  MAX_SCROLL, 'Scroll at exit end');
@@ -135,8 +142,9 @@
     assert_equals(timeline.getCurrentTime('gibberish'), null,
                   'No current time for unknown named range');
 
-    container.scrollLeft = MAX_SCROLL;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = MAX_SCROLL;
+    });
     assert_percents_approx_equal(
       timeline.getCurrentTime('scroll'), 100, MAX_SCROLL,
       'getCurrentTime for "scroll" range at max scroll offset');
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-set-range.html b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-set-range.html
index 7bf4516700c..657ad6046b4 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-set-range.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-get-set-range.html
@@ -58,8 +58,9 @@
     });
     await anim.ready;
 
-    container.scrollLeft = 750;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollLeft = 750;
+    });
 
     // normal ==> cover 0% to cover 100%
     // cover 0% @ 600px
diff --git a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-snapport.html b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-snapport.html
index 5d68d37037a..8e9f8033b91 100644
--- a/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-snapport.html
+++ b/tests/wpt/tests/scroll-animations/view-timelines/view-timeline-snapport.html
@@ -40,18 +40,21 @@
     await anim.ready;
 
     // 0%
-    container.scrollTop = 600;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 600;
+    });
     assert_percents_equal(anim.currentTime, 0);
 
     // 50%
-    container.scrollTop = 800;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 800;
+    });
     assert_percents_equal(anim.currentTime, 50);
 
     // 100%
-    container.scrollTop = 1000;
-    await waitForNextFrame();
+    await runAndWaitForFrameUpdate(() => {
+      container.scrollTop = 1000;
+    });
     assert_percents_equal(anim.currentTime, 100);
   }, 'Default ViewTimeline is not affected by scroll-padding');
 </script>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/navigation-api-precommit-handler.html b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/navigation-api-precommit-handler.html
new file mode 100644
index 00000000000..14c2d8873af
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/navigation-api-precommit-handler.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/soft-navigation-heuristics/resources/soft-navigation-test-helper.js"></script>
+
+<a href="/forward/" id="navigateLink">Click here!</button>
+<h1>Heading!</h1>
+<div id="content"></div>
+
+<script>
+  window.onload = () => {
+    if (test_driver) {
+      test_driver.click(navigateLink);
+    }
+  };
+
+  window.navigation.addEventListener('navigate', e => {
+    e.intercept({
+      async precommitHandler(controller) {
+        // Defer resolving the precommit promise to ensure the navigation is
+        // tracked from the link click through to commit, across tasks.
+        await scheduler.postTask(() => {}, {delay: 20});
+      },
+
+      async handler() {
+        const url = new URL(e.destination.url);
+        if (url.pathname == '/forward/') {
+          // Update the DOM in a separate task to ensure the soft navigation
+          // state continues to be propagated from the commit.
+          await scheduler.yield();
+          content.innerHTML = "<div>The Page Has Navigated</div>";
+        }
+      }
+    });
+  });
+
+  promise_test(async t => {
+    const softNavPromise = SoftNavigationTestHelper.getPerformanceEntries(
+        "soft-navigation", /* minNumEntries= */ 1);
+    const helper = new SoftNavigationTestHelper(t);
+    const softNavs = await helper.withTimeoutMessage(
+        softNavPromise, "Soft navigation not detected.", /*timeout=*/ 3000);
+    assert_equals(softNavs.length, 1, 'Expected exactly one soft navigation.');
+    assert_true(
+      softNavs[0].name.endsWith('/forward/'),
+      `Unexpected Soft Navigation URL. Expected URL to end with "/forward/" but got ${softNavs[0].name}`);
+  }, 'Soft Navigation Detection supports navigation API precommit handlers');
+</script>
diff --git a/tests/wpt/tests/storage-access-api/helpers.js b/tests/wpt/tests/storage-access-api/helpers.js
index a19b72c7e8d..538edb30a17 100644
--- a/tests/wpt/tests/storage-access-api/helpers.js
+++ b/tests/wpt/tests/storage-access-api/helpers.js
@@ -133,31 +133,6 @@ async function DeleteCookieInFrame(frame, name, params) {
   assert_false(cookieStringHasCookie(name, '0', await GetJSCookiesFromFrame(frame)), `Verify that cookie '${name}' has been deleted.`);
 }
 
-// Tests whether the frame can write cookies via document.cookie. Note that this
-// overwrites, then optionally deletes, cookies named "cookie" and "foo".
-//
-// This function requires the caller to have included
-// /cookies/resources/cookie-helper.sub.js.
-async function CanFrameWriteCookies(frame, keep_after_writing = false) {
-  const cookie_suffix = "Secure;SameSite=None;Path=/";
-  await DeleteCookieInFrame(frame, "cookie", cookie_suffix);
-  await DeleteCookieInFrame(frame, "foo", cookie_suffix);
-
-  await SetDocumentCookieFromFrame(frame, `cookie=monster;${cookie_suffix}`);
-  await SetDocumentCookieFromFrame(frame, `foo=bar;${cookie_suffix}`);
-
-  const cookies = await GetJSCookiesFromFrame(frame);
-  const can_write = cookieStringHasCookie("cookie", "monster", cookies) &&
-      cookieStringHasCookie("foo", "bar", cookies);
-
-  if (!keep_after_writing) {
-    await DeleteCookieInFrame(frame, "cookie", cookie_suffix);
-    await DeleteCookieInFrame(frame, "foo", cookie_suffix);
-  }
-
-  return can_write;
-}
-
 // Sets a cookie in an unpartitioned context by opening a window that
 // writes a cookie using document.cookie.
 async function SetFirstPartyCookie(origin, cookie="cookie=unpartitioned;Secure;SameSite=None;Path=/") {
diff --git a/tests/wpt/tests/storage-access-api/storageAccess.testdriver.sub.html b/tests/wpt/tests/storage-access-api/storageAccess.testdriver.sub.html
index cc945dd1823..4eb017e5834 100644
--- a/tests/wpt/tests/storage-access-api/storageAccess.testdriver.sub.html
+++ b/tests/wpt/tests/storage-access-api/storageAccess.testdriver.sub.html
@@ -16,6 +16,7 @@
     const wwwAlt = "https://{{hosts[alt][www]}}:{{ports[https][0]}}";
 
     promise_test(async t => {
+      await SetFirstPartyCookie(wwwAlt);
       await MaybeSetStorageAccess("*", "*", "blocked");
       t.add_cleanup(async () => {
         await test_driver.delete_all_cookies();
@@ -25,7 +26,7 @@
       const responder_html = `${wwwAlt}/storage-access-api/resources/script-with-cookie-header.py?script=embedded_responder.js`;
       const frame = await CreateFrame(responder_html);
 
-      assert_false(await CanFrameWriteCookies(frame), "Cross-site iframe should not be allowed to write cookies via document.cookie.");
+      assert_false(await HasUnpartitionedCookie(frame), "Cross-site iframe should not be allowed to read unpartitioned cookies via document.cookie.");
     });
   </script>
 </body>
diff --git a/tests/wpt/tests/streams/META.yml b/tests/wpt/tests/streams/META.yml
index 1259a55cb5a..a16a3c47a03 100644
--- a/tests/wpt/tests/streams/META.yml
+++ b/tests/wpt/tests/streams/META.yml
@@ -1,7 +1,6 @@
 spec: https://streams.spec.whatwg.org/
 suggested_reviewers:
-  - domenic
-  - yutakahirano
   - youennf
   - wanderview
   - ricea
+  - MattiasBuelens
diff --git a/tests/wpt/tests/svg/types/scripted/SVGPoint.html b/tests/wpt/tests/svg/types/scripted/SVGPoint.html
index cdf44e29f20..59952ac5877 100644
--- a/tests/wpt/tests/svg/types/scripted/SVGPoint.html
+++ b/tests/wpt/tests/svg/types/scripted/SVGPoint.html
@@ -4,22 +4,35 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 test(function() {
-  let svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
-  let point = svgElement.createSVGPoint();
+  const svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+  const point = svgElement.createSVGPoint();
 
   // Check initial point values.
   assert_equals(point.x, 0);
   assert_equals(point.y, 0);
 
-  point.y = 2;
-
-  // Check setting valid arguments.
-  assert_equals(point.x, 0);
-  assert_equals(point.y, 2);
+  // Check assigning points.
+  point.x = 100;
+  assert_equals(point.x, 100);
+  point.y = 200;
+  assert_equals(point.y, 200);
+  point.y = null;
+  assert_equals(point.y, 0);
+  point.y = 200;
 
   // Check setting invalid arguments.
+  assert_throws_js(TypeError, function() { point.x = point; });
+  assert_equals(point.x, 100);
   assert_throws_js(TypeError, function() { point.x = NaN; });
+  assert_equals(point.x, 100);
   assert_throws_js(TypeError, function() { point.x = Infinity; });
-  assert_equals(point.x, 0);
-});
+  assert_equals(point.x, 100);
+
+  assert_throws_js(TypeError, function() { point.y = point; });
+  assert_equals(point.y, 200);
+  assert_throws_js(TypeError, function() { point.y = NaN; });
+  assert_equals(point.y, 200);
+  assert_throws_js(TypeError, function() { point.y = Infinity; });
+  assert_equals(point.y, 200);
+}, `${document.title}, 'x' and 'y' attributes`);
 </script>
diff --git a/tests/wpt/tests/svg/types/scripted/SVGRect.html b/tests/wpt/tests/svg/types/scripted/SVGRect.html
new file mode 100644
index 00000000000..e1dae405d81
--- /dev/null
+++ b/tests/wpt/tests/svg/types/scripted/SVGRect.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>SVGRect interface</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  setup(() => {
+    window.svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+  });
+
+  test(t => {
+    const rect = svgElement.createSVGRect();
+    assert_equals(rect.x, 0, 'initial x');
+    assert_equals(rect.y, 0, 'initial y');
+    assert_equals(rect.width, 0, 'initial width');
+    assert_equals(rect.height, 0, 'initial height');
+  }, `${document.title}, initial values`);
+
+  test(t => {
+    const rect = svgElement.createSVGRect();
+    rect.x = 100;
+    rect.y = 200;
+    rect.width = 300;
+    rect.height = 400;
+    assert_equals(rect.x, 100);
+    assert_equals(rect.y, 200);
+    assert_equals(rect.width, 300);
+    assert_equals(rect.height, 400);
+
+    rect.y = null;
+    assert_equals(rect.y, 0);
+  }, `${document.title}, assignment, numeric values`);
+
+  test(t => {
+    const rect = svgElement.createSVGRect();
+    assert_throws_js(TypeError, () => { rect.x = rect; });
+    assert_throws_js(TypeError, () => { rect.y = 'aString'; });
+    assert_throws_js(TypeError, () => { rect.width = svgElement; });
+    assert_throws_js(TypeError, () => { rect.height = NaN; });
+  }, `${document.title}, assignment, invalid values`);
+</script>
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browser.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browser.py
index aa0b28cc5c9..c4df8953178 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browser.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browser.py
@@ -1,6 +1,7 @@
-from typing import Any, Mapping, MutableMapping, Optional
+from typing import Any, List, Mapping, MutableMapping, Optional, Union
 
 from ._module import BidiModule, command
+from ..undefined import UNDEFINED, Undefined
 
 
 class Browser(BidiModule):
@@ -75,3 +76,18 @@ class Browser(BidiModule):
             params["userContext"] = user_context
 
         return params
+
+    @command
+    def set_download_behavior(
+            self, download_behavior: Optional[Mapping[str, Any]] = None,
+            user_contexts: Union[Undefined, List[str]] = UNDEFINED
+
+    ) -> Mapping[str, Any]:
+        params: MutableMapping[str, Any] = {
+            "downloadBehavior": download_behavior,
+        }
+
+        if user_contexts != UNDEFINED:
+            params["userContexts"] = user_contexts
+
+        return params
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/client.py b/tests/wpt/tests/tools/webdriver/webdriver/client.py
index f4e6259d547..24803b1917d 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/client.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/client.py
@@ -654,6 +654,20 @@ class Session:
 
     #[...]
 
+
+    def set_global_privacy_control(self, gpc):
+        body = {
+            "gpc": gpc,
+        }
+        return self.send_session_command("POST", "privacy", body)
+
+
+    def get_global_privacy_control(self):
+        return self.send_session_command("GET", "privacy")
+
+    #[...]
+
+
     def execute_script(self, script, args=None):
         if args is None:
             args = []
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
index b093b0355d3..086923e4f6c 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
@@ -183,6 +183,30 @@ class SetPermissionAction:
         self.logger.debug("Setting permission %s to %s" % (name, state))
         self.protocol.set_permission.set_permission(descriptor, state)
 
+
+class SetGlobalPrivacyControlAction:
+    name = "set_global_privacy_control"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        gpc = payload["gpc"]
+        return self.protocol.global_privacy_control.set_global_privacy_control(gpc)
+
+class GetGlobalPrivacyControlAction:
+    name = "get_global_privacy_control"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        return self.protocol.global_privacy_control.get_global_privacy_control()
+
+
+
 class AddVirtualAuthenticatorAction:
     name = "add_virtual_authenticator"
 
@@ -586,4 +610,6 @@ actions = [ClickAction,
            RemoveVirtualPressureSourceAction,
            SetProtectedAudienceKAnonymityAction,
            SetDisplayFeaturesAction,
-           ClearDisplayFeaturesAction]
+           ClearDisplayFeaturesAction,
+           GetGlobalPrivacyControlAction,
+           SetGlobalPrivacyControlAction]
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index 37c64e1745b..efc5aaabf53 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -34,6 +34,7 @@ from .protocol import (AccessibilityProtocolPart,
                        DevicePostureProtocolPart,
                        DisplayFeaturesProtocolPart,
                        GenerateTestReportProtocolPart,
+                       GlobalPrivacyControlProtocolPart,
                        PrefsProtocolPart,
                        PrintProtocolPart,
                        Protocol,
@@ -620,6 +621,29 @@ class MarionetteSetPermissionProtocolPart(SetPermissionProtocolPart):
             raise NotImplementedError("set_permission not yet implemented") from e
 
 
+class MarionetteGlobalPrivacyControlProtocolPart(GlobalPrivacyControlProtocolPart):
+    def setup(self):
+        self.marionette = self.parent.marionette
+
+    def set_global_privacy_control(self, gpc):
+        body = {
+            "gpc": gpc,
+        }
+        try:
+            return self.marionette._send_message("WebDriver:SetGlobalPrivacyControl", body)["value"]
+        except errors.UnsupportedOperationException as e:
+            raise NotImplementedError("set_global_privacy_control not yet implemented") from e
+
+    def get_global_privacy_control(self):
+        try:
+            return self.marionette._send_message("WebDriver:GetGlobalPrivacyControl")["value"]
+        except errors.UnsupportedOperationException as e:
+            raise NotImplementedError("get_global_privacy_control not yet implemented") from e
+
+
+
+
+
 class MarionettePrintProtocolPart(PrintProtocolPart):
     def setup(self):
         self.marionette = self.parent.marionette
@@ -795,6 +819,7 @@ class MarionetteProtocol(Protocol):
                   MarionetteGenerateTestReportProtocolPart,
                   MarionetteVirtualAuthenticatorProtocolPart,
                   MarionetteSetPermissionProtocolPart,
+                  MarionetteGlobalPrivacyControlProtocolPart,
                   MarionettePrintProtocolPart,
                   MarionetteDebugProtocolPart,
                   MarionetteAccessibilityProtocolPart,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index eb6fa8d7254..e5d0be7a283 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -48,6 +48,7 @@ from .protocol import (BaseProtocolPart,
                        VirtualPressureSourceProtocolPart,
                        ProtectedAudienceProtocolPart,
                        DisplayFeaturesProtocolPart,
+                       GlobalPrivacyControlProtocolPart,
                        merge_dicts)
 
 from typing import Any, List, Dict, Optional
@@ -938,6 +939,17 @@ class WebDriverDisplayFeaturesProtocolPart(DisplayFeaturesProtocolPart):
     def clear_display_features(self):
         return self.webdriver.send_session_command("DELETE", "displayfeatures")
 
+class WebDriverGlobalPrivacyControlProtocolPart(GlobalPrivacyControlProtocolPart):
+    def setup(self):
+        self.webdriver = self.parent.webdriver
+
+    def set_global_privacy_control(self, gpc):
+        return self.webdriver.set_global_privacy_control(gpc)
+
+    def get_global_privacy_control(self):
+        return self.webdriver.get_global_privacy_control()
+
+
 class WebDriverProtocol(Protocol):
     enable_bidi = False
     implements = [WebDriverBaseProtocolPart,
@@ -963,7 +975,8 @@ class WebDriverProtocol(Protocol):
                   WebDriverStorageProtocolPart,
                   WebDriverVirtualPressureSourceProtocolPart,
                   WebDriverProtectedAudienceProtocolPart,
-                  WebDriverDisplayFeaturesProtocolPart]
+                  WebDriverDisplayFeaturesProtocolPart,
+                  WebDriverGlobalPrivacyControlProtocolPart]
 
     def __init__(self, executor, browser, capabilities, **kwargs):
         super().__init__(executor, browser)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
index 8af313d27d6..afb553053cd 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
@@ -736,6 +736,20 @@ class SetPermissionProtocolPart(ProtocolPart):
         pass
 
 
+class GlobalPrivacyControlProtocolPart(ProtocolPart):
+    """Protocol part for reading and writing the GPC signal"""
+    __metaclass__ = ABCMeta
+
+    name = "global_privacy_control"
+
+    @abstractmethod
+    def set_global_privacy_control(self, value):
+        pass
+
+    @abstractmethod
+    def get_global_privacy_control(self):
+        pass
+
 class ActionSequenceProtocolPart(ProtocolPart):
     """Protocol part for performing trusted clicks"""
     __metaclass__ = ABCMeta
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js b/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
index 4d26a14097f..15022ae5c0c 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
@@ -657,4 +657,12 @@
     window.test_driver_internal.clear_display_features = function(context=null) {
         return create_context_action("clear_display_features", context, {});
     }
+
+    window.test_driver_internal.get_global_privacy_control = function(context=null) {
+        return create_action("get_global_privacy_control", {});
+    };
+
+    window.test_driver_internal.set_global_privacy_control = function(gpc, context=null) {
+        return create_action("set_global_privacy_control", {gpc});
+    };
 })();
diff --git a/tests/wpt/tests/trusted-types/navigate-to-javascript-url-001.html b/tests/wpt/tests/trusted-types/navigate-to-javascript-url-001.html
index 1598cfc25c7..92c059bb011 100644
--- a/tests/wpt/tests/trusted-types/navigate-to-javascript-url-001.html
+++ b/tests/wpt/tests/trusted-types/navigate-to-javascript-url-001.html
@@ -17,12 +17,19 @@
     assert_equals(violation.violatedDirective, "require-trusted-types-for");
     assert_equals(violation.disposition, "enforce");
     assert_equals(violation.sample, `Location href|${clipSampleIfNeeded(kJavaScriptURLCode)}`);
-    assert_equals(violation.lineNumber, 4);
-    // https://w3c.github.io/webappsec-csp/#create-violation-for-global does not
-    // say how to determine the location and browsers provide inconsistent
-    // values for column number, so just check it's at least the offset of the
-    // '=' character of window.
-    assert_greater_than_equal(violation.columnNumber, 9);
+
+    // https://w3c.github.io/webappsec-csp/#create-violation-for-global says,
+    // If the user agent [...] and can extract [... line and column number ...]
+    // We'll allow line and column number be absent. If either is present, we
+    // expect specific values.
+    if (violation.lineNumber || violation.columnNumber) {
+      assert_equals(violation.lineNumber, 4);
+      // https://w3c.github.io/webappsec-csp/#create-violation-for-global does
+      // not say how to determine the location and browsers provide inconsistent
+      // values for column number, so just check it's at least the offset of the
+      // '=' character of window.
+      assert_greater_than_equal(violation.columnNumber, 9);
+    }
     assert_equals(result.exception, null);
   }, "Setting window.location to a javascript: URL without a default policy should report a CSP violation instead of executing the JavaScript code.");
 </script>
diff --git a/tests/wpt/tests/trusted-types/require-trusted-types-for-TypeError-belongs-to-the-global-object-realm.html b/tests/wpt/tests/trusted-types/require-trusted-types-for-TypeError-belongs-to-the-global-object-realm.html
index 07a97303027..fe16e8645b9 100644
--- a/tests/wpt/tests/trusted-types/require-trusted-types-for-TypeError-belongs-to-the-global-object-realm.html
+++ b/tests/wpt/tests/trusted-types/require-trusted-types-for-TypeError-belongs-to-the-global-object-realm.html
@@ -21,6 +21,15 @@
     });
     const divAdoptedFromIframe =
           document.adoptNode(iframe.contentDocument.body.firstElementChild);
-    assert_throws_js(TypeError, _ => divAdoptedFromIframe.innerHTML = 'unsafe');
+
+    // There are cross-browser differences about which realm a node returned
+    // by Document.adoptNode belongs to. Here, we expect that Trusted Types will
+    // throw an exception from divAdoptedFromIframe's realm, but without
+    // taking a stance about whether this should be the window's or the iframe's
+    // realm.
+    // Discussion at: https://github.com/web-platform-tests/wpt/issues/45405
+    assert_throws_js(
+          divAdoptedFromIframe.ownerDocument.defaultView.TypeError,
+          _ => divAdoptedFromIframe.innerHTML = 'unsafe');
   }, "Setting innerHTML on a node adopted from a subframe.");
 </script>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html
index e891da6da2b..9e239d3a31d 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audioworklet.https.html
@@ -1,17 +1,13 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
   <head>
     <title>Test k-rate AudioParam of AudioWorkletNode</title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
 
   <body>
     <script>
-      const audit = Audit.createTaskRunner();
-
       // Use the worklet gain node to test k-rate parameters.
       const filePath =
           '../the-audioworklet-interface/processors/gain-processor.js';
@@ -19,8 +15,7 @@
       // Context for testing
       let context;
 
-      audit.define('Create Test Worklet', (task, should) => {
-
+      promise_test(async () => {
         // Arbitrary sample rate and duration.
         const sampleRate = 8000;
 
@@ -30,24 +25,16 @@
         context = new OfflineAudioContext({
           numberOfChannels: 3,
           sampleRate: sampleRate,
-          length: testDuration * sampleRate
+          length: testDuration * sampleRate,
         });
 
-        should(
-            context.audioWorklet.addModule(filePath),
-            'Construction of AudioWorklet')
-            .beResolved()
-            .then(() => task.done());
-      });
-
-      audit.define('AudioWorklet k-rate AudioParam', (task, should) => {
-        let src = new ConstantSourceNode(context);
-
-        let kRateNode = new AudioWorkletNode(context, 'gain');
+        await context.audioWorklet.addModule(filePath);
 
+        const src = new ConstantSourceNode(context);
+        const kRateNode = new AudioWorkletNode(context, 'gain');
         src.connect(kRateNode).connect(context.destination);
 
-        let kRateParam = kRateNode.parameters.get('gain');
+        const kRateParam = kRateNode.parameters.get('gain');
         kRateParam.automationRate = 'k-rate';
 
         // Automate the gain
@@ -57,23 +44,18 @@
 
         src.start();
 
-        context.startRendering()
-            .then(audioBuffer => {
-              let output = audioBuffer.getChannelData(0);
+        const audioBuffer = await context.startRendering();
+        const output = audioBuffer.getChannelData(0);
 
-              // Verify that the output from the worklet is step-wise
-              // constant.
-              for (let k = 0; k < output.length; k += 128) {
-                should(
-                    output.slice(k, k + 128),
-                    ` k-rate output [${k}: ${k + 127}]`)
-                    .beConstantValueOf(output[k]);
-              }
-            })
-            .then(() => task.done());
-      });
-
-      audit.run();
+        // Verify that the output from the worklet is step-wise
+        // constant.
+        for (let k = 0; k < output.length; k += 128) {
+          assert_array_equals(
+              output.slice(k, k + 128),
+              new Float32Array(128).fill(output[k]),
+              `k-rate output [${k}: ${k + 127}]`);
+        }
+      }, 'AudioWorklet k-rate AudioParam');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/nan-param.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/nan-param.html
index e9b8f0accbd..1993d23debe 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/nan-param.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/nan-param.html
@@ -5,37 +5,35 @@
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
     <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
 
   <body>
     <script>
-      let audit = Audit.createTaskRunner();
-
       // See
       // https://webaudio.github.io/web-audio-api/#computation-of-value.
       //
       // The computed value must replace NaN values in the output with
       // the default value of the param.
-      audit.define('AudioParam NaN', async (task, should) => {
+      promise_test(async () => {
         // For testing, we only need a small number of frames; and
         // a low sample rate is perfectly fine.  Use two channels.
         // The first channel is for the AudioParam output.  The
         // second channel is for the AudioParam input.
-        let context = new OfflineAudioContext(
+        const context = new OfflineAudioContext(
             {numberOfChannels: 2, length: 256, sampleRate: 8192});
-        let merger = new ChannelMergerNode(
+
+        const merger = new ChannelMergerNode(
             context, {numberOfInputs: context.destination.channelCount});
         merger.connect(context.destination);
 
         // A constant source with a huge value.
-        let mod = new ConstantSourceNode(context, {offset: 1e30});
+        const mod = new ConstantSourceNode(context, {offset: 1e30});
 
         // Gain nodes with a huge positive gain and huge negative
         // gain.  Combined with the huge offset in |mod|, the
         // output of the gain nodes are +Infinity and -Infinity.
-        let gainPos = new GainNode(context, {gain: 1e30});
-        let gainNeg = new GainNode(context, {gain: -1e30});
+        const gainPos = new GainNode(context, {gain: 1e30});
+        const gainNeg = new GainNode(context, {gain: -1e30});
 
         mod.connect(gainPos);
         mod.connect(gainNeg);
@@ -49,7 +47,7 @@
         // that produces NaN values.  Use a non-default value offset
         // just in case something is wrong we get default for some
         // other reason.
-        let src = new ConstantSourceNode(context, {offset: 100});
+        const src = new ConstantSourceNode(context, {offset: 100});
 
         gainPos.connect(src.offset);
         gainNeg.connect(src.offset);
@@ -61,10 +59,10 @@
         mod.start();
         src.start();
 
-        let buffer = await context.startRendering();
+        const buffer = await context.startRendering();
 
-        let input = buffer.getChannelData(1);
-        let output = buffer.getChannelData(0);
+        const input = buffer.getChannelData(1);
+        const output = buffer.getChannelData(0);
 
         // Have to test manually for NaN values in the input because
         // NaN fails all comparisons.
@@ -76,17 +74,14 @@
           }
         }
 
-        should(isNaN, 'AudioParam input contains only NaN').beTrue();
+        assert_true(isNaN, 'AudioParam input contains only NaN');
 
         // Output of the AudioParam should have all NaN values
         // replaced by the default.
-        should(output, 'AudioParam output')
-            .beConstantValueOf(src.offset.defaultValue);
-
-        task.done();
-      });
-
-      audit.run();
+        assert_constant_value(
+            output, src.offset.defaultValue,
+            'AudioParam output should flush NaN to default');
+      }, 'AudioParam NaN should be flushed to default value');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html
index 41a37bdb913..18beca5d2e7 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setTargetAtTime.html
@@ -1,80 +1,63 @@
-<!doctype html>
+<!DOCTYPE html>
 <meta charset=utf-8>
 <html>
   <head>
     <title>Test setTargetAtTime with start time in the past</title>
-    <script src=/resources/testharness.js></script>
-    <script src=/resources/testharnessreport.js></script>
-    <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
   </head>
   <body>
     <script>
-      let audit = Audit.createTaskRunner();
+      const suspendFrame = 128;
 
-      audit.define(
-          {
-            label: 'test',
-            description: 'Test setTargetAtTime with start time in the past'
-          },
-          (task, should) => {
-            // Use a sample rate that is a power of two to eliminate round-off
-            // in computing the currentTime.
-            let context = new OfflineAudioContext(2, 16384, 16384);
-            let source = new ConstantSourceNode(context);
+      promise_test(async () => {
+        // Use a sample rate that is a power of two to eliminate round-off
+        // in computing the currentTime.
+        const context = new OfflineAudioContext(2, 16384, 16384);
+        const source = new ConstantSourceNode(context);
 
-            // Suspend the context at this frame so we can synchronously set up
-            // automations.
-            const suspendFrame = 128;
+        const test = new GainNode(context);
+        const reference = new GainNode(context);
 
-            let test = new GainNode(context);
-            let reference = new GainNode(context);
+        source.connect(test);
+        source.connect(reference);
 
-            source.connect(test);
-            source.connect(reference);
+        const merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+        test.connect(merger, 0, 0);
+        reference.connect(merger, 0, 1);
 
-            let merger = new ChannelMergerNode(
-                context, {numberOfInputs: context.destination.channelCount});
-            test.connect(merger, 0, 0);
-            reference.connect(merger, 0, 1);
+        merger.connect(context.destination);
 
-            merger.connect(context.destination);
+        context.suspend(suspendFrame / context.sampleRate).then(() => {
+          // Call setTargetAtTime with a time in the past
+          test.gain.setTargetAtTime(0.1, 0.5*context.currentTime, 0.1);
+          reference.gain.setTargetAtTime(0.1, context.currentTime, 0.1);
+          context.resume();
+        });
 
-            context.suspend(suspendFrame / context.sampleRate)
-                .then(() => {
-                  // Call setTargetAtTime with a time in the past
-                  test.gain.setTargetAtTime(0.1, 0.5*context.currentTime, 0.1);
-                  reference.gain.setTargetAtTime(0.1, context.currentTime, 0.1);
-                })
-                .then(() => context.resume());
+        source.start();
 
-            source.start();
+        const resultBuffer = await context.startRendering();
+        const testValue = resultBuffer.getChannelData(0);
+        const referenceValue = resultBuffer.getChannelData(1);
 
-            context.startRendering()
-                .then(resultBuffer => {
-                  let testValue = resultBuffer.getChannelData(0);
-                  let referenceValue = resultBuffer.getChannelData(1);
+        // Until the suspendFrame, both should be exactly equal to 1.
+        assert_array_equals(
+            testValue.slice(0, suspendFrame),
+            new Float32Array(suspendFrame).fill(1),
+            `Test[0:${suspendFrame - 1}]`);
+        assert_array_equals(
+            referenceValue.slice(0, suspendFrame),
+            new Float32Array(suspendFrame).fill(1),
+            `Reference[0:${suspendFrame - 1}]`);
 
-                  // Until the suspendFrame, both should be exactly equal to 1.
-                  should(
-                      testValue.slice(0, suspendFrame),
-                      `Test[0:${suspendFrame - 1}]`)
-                      .beConstantValueOf(1);
-                  should(
-                      referenceValue.slice(0, suspendFrame),
-                      `Reference[0:${suspendFrame - 1}]`)
-                      .beConstantValueOf(1);
-
-                  // After the suspendFrame, both should be equal (and not
-                  // constant)
-                  should(
-                      testValue.slice(suspendFrame), `Test[${suspendFrame}:]`)
-                      .beEqualToArray(referenceValue.slice(suspendFrame));
-                })
-                .then(() => task.done());
-          });
-
-      audit.run();
+        // After the suspendFrame, both should be equal (and not constant)
+        assert_array_equals(
+            testValue.slice(suspendFrame),
+            referenceValue.slice(suspendFrame),
+            `Test[${suspendFrame}:]`);
+      }, 'Test setTargetAtTime with start time in the past');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html
index 8e51470f646..2644dc870f7 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-audioparam.https.html
@@ -6,80 +6,60 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
-      let audit = Audit.createTaskRunner();
+    <script>
+      const sampleRate = 48000;
+      const renderLength = 48000 * 0.6;
+      const filePath = 'processors/gain-processor.js';
 
-      let sampleRate = 48000;
-      let renderLength = 48000 * 0.6;
-      let context;
+      promise_test(async t => {
+        const context = new OfflineAudioContext(1, renderLength, sampleRate);
+        await context.audioWorklet.addModule(filePath);
+        const constantSourceNode = new ConstantSourceNode(context);
+        const gainNode = new GainNode(context);
+        const inverterNode = new GainNode(context, {gain: -1});
+        const gainWorkletNode = new AudioWorkletNode(context, 'gain');
+        const gainWorkletParam = gainWorkletNode.parameters.get('gain');
 
-      let filePath = 'processors/gain-processor.js';
+        assert_equals(
+            gainWorkletParam.value,
+            Math.fround(0.707),
+            'Default gain value of gainWorkletNode');
+        gainWorkletParam.value = 0.1;
+        assert_equals(
+            gainWorkletParam.value,
+            Math.fround(0.1),
+            'Value of gainWorkletParam after setter = 0.1');
 
-      // Sets up AudioWorklet and OfflineAudioContext.
-      audit.define('Initializing AudioWorklet and Context', (task, should) => {
-        context = new OfflineAudioContext(1, renderLength, sampleRate);
-        context.audioWorklet.addModule(filePath).then(() => {
-          task.done();
+        constantSourceNode.connect(gainNode)
+            .connect(inverterNode)
+            .connect(context.destination);
+        constantSourceNode.connect(gainWorkletNode)
+            .connect(context.destination);
+
+        [gainNode.gain, gainWorkletParam].forEach(param => {
+          param.setValueAtTime(0, 0);
+          param.linearRampToValueAtTime(1, 0.1);
+          param.exponentialRampToValueAtTime(0.5, 0.2);
+          param.setValueCurveAtTime([0, 2, 0.3], 0.2, 0.1);
+          param.setTargetAtTime(0.01, 0.4, 0.5);
         });
-      });
 
-      // Verifies the functionality of AudioParam in AudioWorkletNode by
-      // comparing (canceling out) values from GainNode and AudioWorkletNode
-      // with simple gain computation code by AudioParam.
-      audit.define(
-          'Verifying AudioParam in AudioWorkletNode',
-          (task, should) => {
-            let constantSourceNode = new ConstantSourceNode(context);
-            let gainNode = new GainNode(context);
-            let inverterNode = new GainNode(context, {gain: -1});
-            let gainWorkletNode = new AudioWorkletNode(context, 'gain');
-            let gainWorkletParam = gainWorkletNode.parameters.get('gain');
+        context.suspend(0.5).then(() => {
+          gainNode.gain.value = 1.5;
+          gainWorkletParam.value = 1.5;
+          context.resume();
+        });
 
-            // Test default value and setter/getter functionality.
-            should(gainWorkletParam.value,
-                   'Default gain value of gainWorkletNode')
-                .beEqualTo(Math.fround(0.707));
-            gainWorkletParam.value = 0.1;
-            should(gainWorkletParam.value,
-                   'Value of gainWorkletParam after setter = 0.1')
-                .beEqualTo(Math.fround(0.1));
-
-            constantSourceNode.connect(gainNode)
-                .connect(inverterNode)
-                .connect(context.destination);
-            constantSourceNode.connect(gainWorkletNode)
-                .connect(context.destination);
-
-            // With arbitrary times and values, test all possible AudioParam
-            // automations.
-            [gainNode.gain, gainWorkletParam].forEach((param) => {
-              param.setValueAtTime(0, 0);
-              param.linearRampToValueAtTime(1, 0.1);
-              param.exponentialRampToValueAtTime(0.5, 0.2);
-              param.setValueCurveAtTime([0, 2, 0.3], 0.2, 0.1);
-              param.setTargetAtTime(0.01, 0.4, 0.5);
-            });
-
-            // Test if the setter works correctly in the middle of rendering.
-            context.suspend(0.5).then(() => {
-              gainNode.gain.value = 1.5;
-              gainWorkletParam.value = 1.5;
-              context.resume();
-            });
-
-            constantSourceNode.start();
-            context.startRendering().then((renderedBuffer) => {
-              should(renderedBuffer.getChannelData(0),
-                     'The rendered buffer')
-                  .beConstantValueOf(0);
-              task.done();
-            });
-          });
-
-      audit.run();
+        constantSourceNode.start();
+        const renderedBuffer = await context.startRendering();
+        const actual = renderedBuffer.getChannelData(0);
+        assert_array_equals(
+            actual,
+            new Float32Array(actual.length),
+            'The rendered buffer should be constant 0');
+      }, 'Verifying AudioParam in AudioWorkletNode');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html
index c58502af011..481f80c32a0 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-disconnected-input.https.html
@@ -6,95 +6,84 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
     <script src="/webaudio/resources/audit-util.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
-      let audit = Audit.createTaskRunner();
-
+    <script>
       // Arbitrary numbers used to align the test with render quantum boundary.
       // The sample rate is a power of two to eliminate roundoff in computing
       // the suspend time needed for the test.
-      let sampleRate = 16384;
-      let renderLength = 8 * RENDER_QUANTUM_FRAMES;
-      let context;
-
-      let filePath = 'processors/input-length-processor.js';
-
-      let testChannelValues = [1, 2, 3];
+      const sampleRate = 16384;
+      const renderLength = 8 * RENDER_QUANTUM_FRAMES;
+      const filePath = 'processors/input-length-processor.js';
 
       // Creates a 3-channel buffer and play with BufferSourceNode. The source
       // goes through a bypass AudioWorkletNode (gain value of 1).
-      audit.define(
-          {
-            label: 'test',
-            description:
-                'Input array length should be zero for disconnected input'
-          },
-          (task, should) => {
-            context = new OfflineAudioContext({
-              numberOfChannels: 1,
-              length: renderLength,
-              sampleRate: sampleRate
-            });
+      promise_test(async () => {
+        const context = new OfflineAudioContext({
+          numberOfChannels: 1,
+          length: renderLength,
+          sampleRate: sampleRate
+        });
 
-            context.audioWorklet.addModule(filePath).then(() => {
-              let sourceNode = new ConstantSourceNode(context);
-              let workletNode =
-                  new AudioWorkletNode(context, 'input-length-processor');
+        await context.audioWorklet.addModule(filePath);
 
-              workletNode.connect(context.destination);
+        const sourceNode = new ConstantSourceNode(context);
+        const workletNode =
+            new AudioWorkletNode(context, 'input-length-processor');
 
-              // Connect the source now.
-              let connectFrame = RENDER_QUANTUM_FRAMES;
+        workletNode.connect(context.destination);
 
-              context.suspend(connectFrame / sampleRate)
-                  .then(() => {
-                    sourceNode.connect(workletNode);
-                  })
-                  .then(() => context.resume());
-              ;
+        // Connect the source after one render quantum.
+        const connectFrame = RENDER_QUANTUM_FRAMES;
+        context.suspend(connectFrame / sampleRate).then(() => {
+          sourceNode.connect(workletNode);
+          return context.resume();
+        });
+        // Disconnect the source after three render quanta.
+        const disconnectFrame = 3 * RENDER_QUANTUM_FRAMES;
+        context.suspend(disconnectFrame / sampleRate).then(() => {
+          sourceNode.disconnect(workletNode);
+          return context.resume();
+        });
 
-              // Then disconnect the source after a few renders
-              let disconnectFrame = 3 * RENDER_QUANTUM_FRAMES;
-              context.suspend(disconnectFrame / sampleRate)
-                  .then(() => {
-                    sourceNode.disconnect(workletNode);
-                  })
-                  .then(() => context.resume());
+        sourceNode.start();
+        const resultBuffer = await context.startRendering();
+        const data = resultBuffer.getChannelData(0);
 
-              sourceNode.start();
-              context.startRendering()
-                  .then(resultBuffer => {
-                    let data = resultBuffer.getChannelData(0);
+        // Before connecting the source: input array length should be 0.
+        assert_array_equals(
+            data.subarray(0, connectFrame),
+            new Float32Array(connectFrame),
+            'Before connecting the source: Input array length should be 0');
 
-                    should(
-                        data.slice(0, connectFrame),
-                        'Before connecting the source: Input array length')
-                        .beConstantValueOf(0);
+        // Find where the output is no longer 0.
+        const nonZeroIndex = data.findIndex(x => x > 0);
+        assert_equals(
+            nonZeroIndex,
+            connectFrame,
+            'First non-zero output should occur exactly at connectFrame');
 
-                    // Find where the output is no longer 0.
-                    let nonZeroIndex = data.findIndex(x => x > 0);
-                    should(nonZeroIndex, 'First non-zero output')
-                        .beEqualTo(connectFrame);
+        // While source is connected: Input array length
+        // should be RENDER_QUANTUM_FRAMES
+        {
+          const expectedLength = disconnectFrame - connectFrame;
+          const expected =
+              new Float32Array(expectedLength).fill(RENDER_QUANTUM_FRAMES);
+          assert_array_equals(
+              data.subarray(connectFrame, disconnectFrame), expected,
+              'While source is connected: Input array length');
+        }
 
-                    should(
-                        data.slice(
-                            nonZeroIndex,
-                            nonZeroIndex + (disconnectFrame - connectFrame)),
-                        'While source is connected: Input array length')
-                        .beConstantValueOf(RENDER_QUANTUM_FRAMES);
-                    should(
-                        data.slice(disconnectFrame),
-                        'After disconnecting the source: Input array length')
-                        .beConstantValueOf(0);
-                  })
-                  .then(() => task.done());
-            });
-          });
-
-      audit.run();
+        // After disconnecting the source: Input array length should be zero
+        {
+          const expectedLength = data.length - disconnectFrame;
+          const expected = new Float32Array(expectedLength);
+          assert_array_equals(
+              data.subarray(disconnectFrame), expected,
+              'After disconnecting the source: Input array length');
+        }
+      }, 'Input array length should be zero for disconnected input');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html
index 0712d6bccef..b0afc864116 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-convolvernode-interface/active-processing.https.html
@@ -6,36 +6,31 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
 
   <body>
-    <script id="layout-test-code">
-      // AudioProcessor that sends a message to its AudioWorkletNode whenver the
-      // number of channels on its input changes.
-      let filePath =
+    <script>
+      // AudioProcessor that sends a message to its AudioWorkletNode
+      // whenever the number of channels on its input changes.
+      const filePath =
           '../the-audioworklet-interface/processors/active-processing.js';
 
-      const audit = Audit.createTaskRunner();
-
       let context;
 
-      audit.define('initialize', (task, should) => {
+      promise_test(async () => {
         // Create context and load the module
         context = new AudioContext();
-        should(
-            context.audioWorklet.addModule(filePath),
-            'AudioWorklet module loading')
-            .beResolved()
-            .then(() => task.done());
-      });
+        await context.audioWorklet.addModule(filePath);
+      }, 'AudioWorklet module should load successfully');
 
-      audit.define('test', (task, should) => {
+      promise_test(async () => {
         const src = new OscillatorNode(context);
 
-        const response = new AudioBuffer({numberOfChannels: 2, length: 150,
-        sampleRate: context.sampleRate});
+        const response = new AudioBuffer({
+          numberOfChannels: 2,
+          length: 150,
+          sampleRate: context.sampleRate
+        });
 
         const conv = new ConvolverNode(context, {buffer: response});
 
@@ -43,51 +38,52 @@
             new AudioWorkletNode(context, 'active-processing-tester', {
               // Use as short a duration as possible to keep the test from
               // taking too much time.
-              processorOptions: {testDuration: .5},
+              processorOptions: {testDuration: 0.5},
             });
 
-        // Expected number of output channels from the convolver node.  We should
-        // start with the number of inputs, because the source (oscillator) is
-        // actively processing.  When the source stops, the number of channels
-        // should change to 0.
+        // Expected number of output channels from the convolver node.
+        // We should start with the number of inputs, because the
+        // source (oscillator) is actively processing. When the source
+        // stops, the number of channels should change to 0.
         const expectedValues = [2, 0];
         let index = 0;
 
-        testerNode.port.onmessage = event => {
-          let count = event.data.channelCount;
-          let finished = event.data.finished;
+        return new Promise(resolve => {
+          testerNode.port.onmessage = event => {
+            const count = event.data.channelCount;
+            const finished = event.data.finished;
 
-          // If we're finished, end testing.
-          if (finished) {
-            // Verify that we got the expected number of changes.
-            should(index, 'Number of distinct values')
-                .beEqualTo(expectedValues.length);
+            // If we're finished, end testing.
+            if (finished) {
+              // Verify that we got the expected number of changes.
+              assert_equals(
+                  index, expectedValues.length,
+                  'Number of distinct values');
+              resolve();
+              return;
+            }
 
-            task.done();
-            return;
-          }
+            if (index < expectedValues.length) {
+              // Verify that the number of channels matches the expected
+              // number of channels.
+              assert_equals(
+                  count, expectedValues[index],
+                  `Test ${index}: Number of convolver output channels`);
+            }
 
-          if (index < expectedValues.length) {
-            // Verify that the number of channels matches the expected number of
-            // channels.
-            should(count, `Test ${index}: Number of convolver output channels`)
-                .beEqualTo(expectedValues[index]);
-          }
+            ++index;
+          };
 
-          ++index;
-        };
+          // Create the graph and go
+          src.connect(conv).connect(testerNode).connect(context.destination);
+          src.start();
 
-        // Create the graph and go
-        src.connect(conv).connect(testerNode).connect(context.destination);
-        src.start();
-
-        // Stop the source after a short time so we can test that the convolver
-        // changes to not actively processing and thus produces a single channel
-        // of silence.
-        src.stop(context.currentTime + .1);
-      });
-
-      audit.run();
+          // Stop the source after a short time so we can test that the
+          // convolver changes to not actively processing and thus
+          // produces a single channel of silence.
+          src.stop(context.currentTime + 0.1);
+        });
+      }, 'ConvolverNode should stop active processing after source stops');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-pannernode-interface/panner-rolloff-clamping.html b/tests/wpt/tests/webaudio/the-audio-api/the-pannernode-interface/panner-rolloff-clamping.html
index 387f8730109..288f5d0b26e 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-pannernode-interface/panner-rolloff-clamping.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-pannernode-interface/panner-rolloff-clamping.html
@@ -6,30 +6,12 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="../../resources/audit-util.js"></script>
-    <script src="../../resources/audit.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
+    <script>
       // Fairly arbitrary sample rate and render frames.
-      let sampleRate = 16000;
-      let renderFrames = 2048;
-
-      let audit = Audit.createTaskRunner();
-
-      audit.define(
-          {
-            label: 'linear-clamp-high',
-            description: 'rolloffFactor clamping for linear distance model'
-          },
-          (task, should) => {
-            runTest(should, {
-              distanceModel: 'linear',
-              // Fairly arbitrary value outside the nominal range
-              rolloffFactor: 2,
-              clampedRolloff: 1
-            }).then(() => task.done());
-          });
+      const sampleRate = 16000;
+      const renderFrames = 2048;
 
       // Test clamping of the rolloffFactor.  The test is done by comparing the
       // output of a panner with the rolloffFactor set outside the nominal range
@@ -42,18 +24,18 @@
       //                    nominal range of the distance model.
       //   clampedRolloff - The rolloffFactor (above) clamped to the nominal
       //                    range for the given distance model.
-      function runTest(should, options) {
+      const runTest = async (options) => {
         // Offline context with two channels.  The first channel is the panner
         // node under test.  The second channel is the reference panner node.
-        let context = new OfflineAudioContext(2, renderFrames, sampleRate);
+        const context = new OfflineAudioContext(2, renderFrames, sampleRate);
 
         // The source for the panner nodes.  This is fairly arbitrary.
-        let src = new OscillatorNode(context, {type: 'sawtooth'});
+        const src = new OscillatorNode(context, {type: 'sawtooth'});
 
         // Create the test panner with the specified rolloff factor.  The
         // position is fairly arbitrary, but something that is not the default
         // is good to show the distance model had some effect.
-        let pannerTest = new PannerNode(context, {
+        const pannerTest = new PannerNode(context, {
           rolloffFactor: options.rolloffFactor,
           distanceModel: options.distanceModel,
           positionX: 5000
@@ -61,7 +43,7 @@
 
         // Create the reference panner with the rolloff factor clamped to the
         // appropriate limit.
-        let pannerRef = new PannerNode(context, {
+        const pannerRef = new PannerNode(context, {
           rolloffFactor: options.clampedRolloff,
           distanceModel: options.distanceModel,
           positionX: 5000
@@ -69,7 +51,7 @@
 
 
         // Connect the source to the panners to the destination appropriately.
-        let merger = new ChannelMergerNode(context, {numberOfInputs: 2});
+        const merger = new ChannelMergerNode(context, {numberOfInputs: 2});
 
 
         src.connect(pannerTest).connect(merger, 0, 0);
@@ -79,20 +61,20 @@
 
         src.start();
 
-        return context.startRendering().then(function(resultBuffer) {
-          // The two channels should be the same due to the clamping.  Verify
-          // that they are the same.
-          let actual = resultBuffer.getChannelData(0);
-          let expected = resultBuffer.getChannelData(1);
-
-          let message = 'Panner distanceModel: "' + options.distanceModel +
-              '", rolloffFactor: ' + options.rolloffFactor;
-
-          should(actual, message).beEqualToArray(expected);
-        });
-      }
-
-      audit.run();
+        const resultBuffer = await context.startRendering();
+        // The two channels should be the same due to the clamping.  Verify
+        // that they are the same.
+        const actual = resultBuffer.getChannelData(0);
+        const expected = resultBuffer.getChannelData(1);
+        const message = `Panner distanceModel: "${options.distanceModel}", ` +
+            `rolloffFactor: ${options.rolloffFactor}`;
+        assert_array_equals(actual, expected, message);
+      };
+      promise_test(() => runTest({
+        distanceModel: 'linear',
+        rolloffFactor: 2,
+        clampedRolloff: 1
+      }), 'rolloffFactor clamping for linear distance model');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html
index e897ac08a10..a47b566ea66 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-copy-curve.html
@@ -7,94 +7,74 @@
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
     <script src="../../resources/audit-util.js"></script>
-    <script src="../../resources/audit.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
+    <script>
       // Sample rate and number of frames are fairly arbitrary.  We need to
       // render, however, at least 384 frames.  1024 is a nice small value.
-      let sampleRate = 16000;
-      let renderFrames = 1024;
+      const sampleRate = 16000;
+      const renderFrames = 1024;
 
-      let audit = Audit.createTaskRunner();
+      promise_test(async () => {
+        // Two-channel context; channel 0 contains the test data and channel
+        // 1 contains the expected result.  Channel 1 has the normal
+        // WaveShaper output and channel 0 has the WaveShaper output with a
+        // modified curve.
+        const context = new OfflineAudioContext(2, renderFrames, sampleRate);
 
-      audit.define(
-          {
-            label: 'test copying',
-            description: 'Modifying curve should not modify WaveShaper'
-          },
-          (task, should) => {
-            // Two-channel context; channel 0 contains the test data and channel
-            // 1 contains the expected result.  Channel 1 has the normal
-            // WaveShaper output and channel 0 has the WaveShaper output with a
-            // modified curve.
-            let context = new OfflineAudioContext(2, renderFrames, sampleRate);
+        // Wave shaper curves.  Doesn't really matter what we use as long as
+        // it modifies the input in some way.  Thus, keep it simple and just
+        // invert the input.
+        const desiredCurve = [1, 0, -1];
+        const curve0 = Float32Array.from(desiredCurve);
+        const curve1 = Float32Array.from(desiredCurve);
 
-            // Just use a default oscillator as the source.  Doesn't really
-            // matter what we use.
-            let src = context.createOscillator();
-            src.type = 'sawtooth';
+        // Just use a default oscillator as the source.  Doesn't really
+        // matter what we use.
+        const src = new OscillatorNode(context, {type: 'sawtooth'});
 
-            // Create the wave shapers: ws0 is the test shaper, and ws1 is the
-            // reference wave shaper.
-            let ws0 = context.createWaveShaper();
-            let ws1 = context.createWaveShaper();
+        // Create the wave shapers: ws0 is the test shaper, and ws1 is the
+        // reference wave shaper.
+        const ws0 = new WaveShaperNode(context, {curve: curve0});
+        const ws1 = new WaveShaperNode(context, {curve: curve1});
 
-            // Wave shaper curves.  Doesn't really matter what we use as long as
-            // it modifies the input in some way.  Thus, keep it simple and just
-            // invert the input.
-            let desiredCurve = [1, 0, -1];
-            let curve0 = Float32Array.from(desiredCurve);
-            let curve1 = Float32Array.from(desiredCurve);
+        // Channel merger for comparing outputs (ch 0: modified-curve shaper,
+        // ch 1: reference shaper).
+        const merger = new ChannelMergerNode(context, {numberOfInputs: 2});
 
-            ws0.curve = curve0;
-            ws1.curve = curve1;
+        src.connect(ws0).connect(merger, 0, 0);
+        src.connect(ws1).connect(merger, 0, 1);
 
-            let merger = context.createChannelMerger(2);
+        merger.connect(context.destination);
 
-            // Connect the graph
-            src.connect(ws0);
-            src.connect(ws1);
+        // Let the context run for a bit and then modify the curve for ws0.
+        // Doesn't really matter what we modify the curve to as long as it's
+        // different.
+        const suspendTime = 256 / context.sampleRate;
+        context.suspend(suspendTime).then(() => {
+          // Mutate the original array we passed to ws0;
+          // node should have copied it.
+          curve0[0] = -0.5;
+          curve0[1] = 0.125;
+          curve0[2] = 0.75;
+          return context.resume();
+        });
 
-            ws0.connect(merger, 0, 0);
-            ws1.connect(merger, 0, 1);
+        src.start();
 
-            merger.connect(context.destination);
+        const renderedBuffer = await context.startRendering();
+        const actual = renderedBuffer.getChannelData(0);
+        const expected = renderedBuffer.getChannelData(1);
 
-            // Let the context run for a bit and then modify the curve for ws0.
-            // Doesn't really matter what we modify the curve to as long as it's
-            // different.
-            context.suspend(256 / context.sampleRate)
-                .then(() => {
-                  should(
-                      () => {
-                        curve0[0] = -0.5;
-                        curve0[1] = 0.125;
-                        curve0[2] = 0.75;
-                      },
-                      `Modifying curve array at time ${context.currentTime}`)
-                      .notThrow();
-                })
-                .then(context.resume.bind(context));
-
-            src.start();
-
-            context.startRendering()
-                .then(function(renderedBuffer) {
-                  let actual = renderedBuffer.getChannelData(0);
-                  let expected = renderedBuffer.getChannelData(1);
-
-                  // Modifying the wave shaper curve should not modify the
-                  // output so the outputs from the two wave shaper nodes should
-                  // be exactly identical.
-                  should(actual, 'Output of WaveShaper with modified curve')
-                      .beEqualToArray(expected);
-
-                })
-                .then(() => task.done());
-          });
-
-      audit.run();
+        // Modifying the wave shaper curve should not modify the
+        // output so the outputs from the two wave shaper nodes should
+        // be exactly identical.
+        assert_array_equals(
+            actual,
+            expected,
+            'Output of WaveShaper with modified curve ' +
+                'should equal reference output');
+      }, `test copying: Modifying curve should not modify WaveShaper`);
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/conftest.py
new file mode 100644
index 00000000000..a630116e198
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/conftest.py
@@ -0,0 +1,111 @@
+import tempfile
+
+import pytest
+import pytest_asyncio
+
+from webdriver import TimeoutException
+from webdriver.bidi.modules.script import ContextTarget
+
+DOWNLOAD_END = "browsingContext.downloadEnd"
+
+
+@pytest.fixture
+def temp_dir():
+    return tempfile.mkdtemp()
+
+
+@pytest_asyncio.fixture(params=["new", "default"])
+async def user_context_invariant(request, create_user_context):
+    if request.param == "default":
+        return "default"
+    return await create_user_context()
+
+
+@pytest.fixture(params=[True, False])
+def is_download_allowed_invariant(request, temp_dir):
+    return request.param
+
+
+@pytest.fixture
+def some_download_behavior(is_download_allowed_invariant, temp_dir):
+    """
+    Returns a download behavior matching `is_download_allowed_invariant`.
+    """
+    if is_download_allowed_invariant:
+        return {
+            "type": "allowed",
+            "destinationFolder": temp_dir
+        }
+    return {"type": "denied"}
+
+
+@pytest.fixture
+def opposite_download_behavior(is_download_allowed_invariant, temp_dir):
+    """
+    Returns a download behavior opposite to `is_download_allowed_invariant`.
+    """
+    if is_download_allowed_invariant:
+        return {"type": "denied"}
+    return {
+        "type": "allowed",
+        "destinationFolder": temp_dir
+    }
+
+
+@pytest.fixture
+def trigger_download(bidi_session, subscribe_events, wait_for_event,
+        wait_for_future_safe, inline):
+    """
+    Triggers download and returns either `browsingContext.downloadEnd` event or
+    None if the download was not ended (e.g. if User Agent showed file save
+    dialog).
+    """
+
+    async def trigger_download(context):
+        page_with_download_link = inline(
+            f"""<a id="download_link" href="{inline("")}" download="some_file.txt">download</a>""")
+        await bidi_session.browsing_context.navigate(context=context["context"],
+                                                     url=page_with_download_link,
+                                                     wait="complete")
+
+        await subscribe_events(events=[DOWNLOAD_END])
+
+        on_download_will_begin = wait_for_event(DOWNLOAD_END)
+        # Trigger download by clicking the link.
+        await bidi_session.script.evaluate(
+            expression="download_link.click()",
+            target=ContextTarget(context["context"]),
+            await_promise=True,
+            user_activation=True,
+        )
+
+        try:
+            return await wait_for_future_safe(
+                on_download_will_begin, timeout=0.5)
+        except TimeoutException:
+            # User Agent showed file save dialog.
+            return None
+
+    return trigger_download
+
+
+@pytest.fixture
+def is_download_allowed(trigger_download):
+    """
+    Returns True, if download is allowed, False if download is not allowed, or
+    "timeout" if download is not finished (e.g. if User Agent showed file save
+    dialog).
+    """
+
+    async def is_download_allowed(context):
+        event = await trigger_download(context)
+        if event is None:
+            return "timeout"
+        return event["status"] == "complete"
+
+    return is_download_allowed
+
+
+@pytest_asyncio.fixture
+async def default_is_download_allowed(is_download_allowed, new_tab):
+    return await is_download_allowed(new_tab)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_allowed.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_allowed.py
new file mode 100644
index 00000000000..9864a2610db
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_allowed.py
@@ -0,0 +1,28 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_allow_and_reset(bidi_session, new_tab, temp_dir,
+        is_download_allowed, trigger_download, default_is_download_allowed):
+    await bidi_session.browser.set_download_behavior(download_behavior={
+        "type": "allowed",
+        "destinationFolder": temp_dir
+    })
+    assert await is_download_allowed(new_tab) == True
+
+    await bidi_session.browser.set_download_behavior(download_behavior=None)
+    assert await is_download_allowed(new_tab) == default_is_download_allowed
+
+
+async def test_destination_folder(bidi_session, new_tab, temp_dir,
+        trigger_download):
+    await bidi_session.browser.set_download_behavior(download_behavior={
+        "type": "allowed",
+        "destinationFolder": temp_dir
+    })
+    event = await trigger_download(new_tab)
+    # Assert download is allowed.
+    assert event["status"] == "complete"
+    # Assert `destinationFolder` is respected.
+    assert event["filepath"].startswith(temp_dir)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_denied.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_denied.py
new file mode 100644
index 00000000000..a0e8442f4a2
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/download_behavior_denied.py
@@ -0,0 +1,15 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_deny_and_reset(bidi_session, new_tab, temp_dir,
+        is_download_allowed,
+        default_is_download_allowed):
+    await bidi_session.browser.set_download_behavior(download_behavior={
+        "type": "denied"
+    })
+    assert await is_download_allowed(new_tab) == False
+
+    await bidi_session.browser.set_download_behavior(download_behavior=None)
+    assert await is_download_allowed(new_tab) == default_is_download_allowed
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/global.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/global.py
new file mode 100644
index 00000000000..f3200073f7f
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/global.py
@@ -0,0 +1,97 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_set_and_reset_globally(bidi_session, temp_dir, top_context,
+        is_download_allowed, is_download_allowed_invariant, trigger_download,
+        create_user_context, some_download_behavior,
+        opposite_download_behavior):
+    default_download_allowed = await is_download_allowed(
+        top_context)
+
+    user_context = await create_user_context()
+    context_in_user_context = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab")
+    default_user_context_download_allowed = await is_download_allowed(
+        context_in_user_context)
+
+    # Set custom download behavior globally.
+    await bidi_session.browser.set_download_behavior(
+        download_behavior=some_download_behavior)
+
+    assert await is_download_allowed(
+        top_context) == is_download_allowed_invariant
+    assert await is_download_allowed(
+        await bidi_session.browsing_context.create(user_context="default",
+                                                   type_hint="tab")) == is_download_allowed_invariant
+
+    assert await is_download_allowed(
+        context_in_user_context) == is_download_allowed_invariant
+    assert await is_download_allowed(
+        await bidi_session.browsing_context.create(user_context=user_context,
+                                                   type_hint="tab")) == is_download_allowed_invariant
+
+    assert await is_download_allowed(
+        context_in_user_context) == is_download_allowed_invariant
+
+    # Reset global behavior.
+    await bidi_session.browser.set_download_behavior(download_behavior=None)
+
+    # Assert the override is reset for default user context.
+    assert await is_download_allowed(top_context) == default_download_allowed
+    assert await is_download_allowed(
+        await bidi_session.browsing_context.create(user_context="default",
+                                                   type_hint="tab")) == default_download_allowed
+
+    # Assert the override is reset for custom user context.
+    assert await is_download_allowed(
+        context_in_user_context) == default_user_context_download_allowed
+    assert await is_download_allowed(
+        await bidi_session.browsing_context.create(user_context=user_context,
+                                                   type_hint="tab")) == default_user_context_download_allowed
+
+
+async def test_set_and_reset_globally_and_per_user_context(bidi_session,
+        temp_dir, is_download_allowed, is_download_allowed_invariant,
+        trigger_download, create_user_context, some_download_behavior,
+        opposite_download_behavior, user_context_invariant):
+    context_in_user_context = await bidi_session.browsing_context.create(
+        user_context=user_context_invariant, type_hint="tab")
+
+    default_download_allowed = await is_download_allowed(
+        context_in_user_context)
+
+    # Set behavior per user context.
+    await bidi_session.browser.set_download_behavior(
+        download_behavior=some_download_behavior,
+        user_contexts=[user_context_invariant])
+
+    # The behavior should be set.
+    assert await is_download_allowed(
+        context_in_user_context) == is_download_allowed_invariant
+
+    # Set global override.
+    await bidi_session.browser.set_download_behavior(
+        download_behavior=opposite_download_behavior)
+
+    # The behavior per user context should still be active.
+    assert await is_download_allowed(
+        context_in_user_context) == is_download_allowed_invariant
+
+    # Reset per user context override.
+    await bidi_session.browser.set_download_behavior(download_behavior=None,
+                                                     user_contexts=[
+                                                         user_context_invariant])
+
+    # The global override should be active. `opposite_download_behavior` is
+    # opposite to `download_behaviors_invariant`.
+    assert await is_download_allowed(context_in_user_context) == (
+        not is_download_allowed_invariant)
+
+    # Reset global behavior.
+    await bidi_session.browser.set_download_behavior(download_behavior=None)
+
+    # The override should be disabled.
+    assert await is_download_allowed(
+        context_in_user_context) == default_download_allowed
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/invalid.py
new file mode 100644
index 00000000000..6aa12805a4b
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/invalid.py
@@ -0,0 +1,63 @@
+import pytest
+
+import webdriver.bidi.error as error
+from tests.bidi import get_invalid_cases
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("dict", nullable=True))
+async def test_params_download_behavior_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior=value)
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("string"))
+async def test_params_download_behavior_type_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior={"type": value})
+
+
+async def test_params_download_behavior_type_invalid_value(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior={"type": "SOME_INVALID_VALUE"})
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("string"))
+async def test_params_download_behavior_allowed_destination_folder_invalid_value(
+        bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior={
+                "type": "allowed",
+                "destinationFolder": value
+            })
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("list"))
+async def test_params_user_contexts_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior=None, user_contexts=value)
+
+
+async def test_params_user_contexts_empty_list(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior=None, user_contexts=[])
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("string"))
+async def test_params_user_contexts_value_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior=None, user_contexts=[value])
+
+
+async def test_params_user_contexts_value_unknown_user_context(bidi_session):
+    with pytest.raises(error.NoSuchUserContextException):
+        await bidi_session.browser.set_download_behavior(
+            download_behavior=None, user_contexts=["UNKNOWN_USER_CONTEXT"])
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/user_context.py b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/user_context.py
new file mode 100644
index 00000000000..e4e4ef14c81
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/set_download_behavior/user_context.py
@@ -0,0 +1,74 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_user_contexts(bidi_session, temp_dir, is_download_allowed,
+        is_download_allowed_invariant, trigger_download, create_user_context,
+        some_download_behavior, user_context_invariant):
+    affected_user_context = await create_user_context() if user_context_invariant == "new" else "default"
+    not_affected_user_context = "default" if user_context_invariant == "new" else await create_user_context()
+
+    context_in_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=affected_user_context, type_hint="tab")
+    context_in_not_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=not_affected_user_context, type_hint="tab")
+    # Default can be different from different user contexts.
+    default_affected_context_download_allowed = await is_download_allowed(
+        context_in_affected_user_context)
+    default_not_affected_context_download_allowed = await is_download_allowed(
+        context_in_not_affected_user_context)
+
+    # Set custom download behavior.
+    await bidi_session.browser.set_download_behavior(
+        download_behavior=some_download_behavior,
+        user_contexts=[affected_user_context])
+
+    # Assert behavior is set in affected user context.
+    assert await is_download_allowed(
+        context_in_affected_user_context) == is_download_allowed_invariant
+
+    # Create a new context in the affected user context.
+    another_context_in_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=affected_user_context, type_hint="tab")
+    # Assert behavior is set in a new browsing context of the affected user context.
+    assert await is_download_allowed(
+        another_context_in_affected_user_context) == is_download_allowed_invariant
+
+    # Assert behavior is not set in not affected user context.
+    assert await is_download_allowed(
+        context_in_not_affected_user_context) == default_not_affected_context_download_allowed
+
+    # Create a new context in not affected user context.
+    another_context_in_not_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=not_affected_user_context, type_hint="tab")
+    # Assert behavior is not set in a new browsing context of not affected user context.
+    assert await is_download_allowed(
+        another_context_in_not_affected_user_context) == default_not_affected_context_download_allowed
+
+    # Reset to default behavior.
+    await bidi_session.browser.set_download_behavior(
+        download_behavior=None,
+        user_contexts=[affected_user_context])
+
+    # Assert behavior is reset in affected user context.
+    assert await is_download_allowed(
+        context_in_affected_user_context) == default_affected_context_download_allowed
+
+    # Create a new context in affected user context.
+    another_context_in_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=affected_user_context, type_hint="tab")
+    # Assert behavior is reset in a new browsing context of affected user context.
+    assert await is_download_allowed(
+        another_context_in_affected_user_context) == default_affected_context_download_allowed
+
+    # Assert behavior is reset in not affected user context.
+    assert await is_download_allowed(
+        context_in_not_affected_user_context) == default_not_affected_context_download_allowed
+
+    # Create a new context in not affected user context.
+    another_context_in_not_affected_user_context = await bidi_session.browsing_context.create(
+        user_context=not_affected_user_context, type_hint="tab")
+    # Assert behavior is reset in a new browsing context of not affected user context.
+    assert await is_download_allowed(
+        another_context_in_not_affected_user_context) == default_not_affected_context_download_allowed
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/download_end.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/download_end.py
index 8594d91cbaf..e5bff878891 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/download_end.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/download_end.py
@@ -11,6 +11,7 @@ pytestmark = pytest.mark.asyncio
 
 CONTENT = "SOME_FILE_CONTENT"
 DOWNLOAD_END = "browsingContext.downloadEnd"
+NAVIGATION_STARTED = "browsingContext.navigationStarted"
 
 
 @pytest.fixture
@@ -62,7 +63,7 @@ async def test_unsubscribe(bidi_session, inline, new_tab, wait_for_event,
     remove_listener()
 
 
-async def test_subscribe(bidi_session, subscribe_events, new_tab, inline,
+async def test_download_attribute(bidi_session, subscribe_events, new_tab, inline,
         wait_for_event, wait_for_future_safe, download_link, filename):
     url = inline(
         f"""<a id="download_link" href="{download_link}" download="{filename}">download</a>""")
@@ -86,7 +87,7 @@ async def test_subscribe(bidi_session, subscribe_events, new_tab, inline,
         {
             'filepath': any_string,
             'context': new_tab["context"],
-            'navigation': any_string,
+            'navigation': None,
             'status': 'complete',
             'timestamp': any_int,
             'url': download_link,
@@ -96,3 +97,63 @@ async def test_subscribe(bidi_session, subscribe_events, new_tab, inline,
     with open(event['filepath'], mode='r', encoding='utf-8') as file:
         file_content = file.read()
     assert file_content == CONTENT
+
+
+async def test_content_disposition_header(
+    bidi_session,
+    subscribe_events,
+    new_tab,
+    url,
+    inline,
+    wait_for_event,
+    wait_for_future_safe,
+    filename,
+):
+    content_disposition_link = url(
+        "/webdriver/tests/support/http_handlers/headers.py?"
+        + f"content={CONTENT}"
+        + f"&header=Content-Disposition:attachment;%20filename={filename}"
+    )
+    page_url = inline(
+        f"""<a id="content_disposition_link" href="{content_disposition_link}">contentdisposition</a>"""
+    )
+
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"], url=page_url, wait="complete"
+    )
+
+    await subscribe_events(events=[DOWNLOAD_END, NAVIGATION_STARTED])
+    on_navigation_started = wait_for_event(NAVIGATION_STARTED)
+    on_download_end = wait_for_event(DOWNLOAD_END)
+
+    await bidi_session.script.evaluate(
+        expression="content_disposition_link.click()",
+        target=ContextTarget(new_tab["context"]),
+        await_promise=True,
+        user_activation=True,
+    )
+
+    download_event = await wait_for_future_safe(on_download_end)
+    recursive_compare(
+        {
+            "filepath": any_string,
+            "context": new_tab["context"],
+            "navigation": any_string,
+            "status": "complete",
+            "timestamp": any_int,
+            "url": content_disposition_link,
+        },
+        download_event,
+    )
+
+    navigation_event = await wait_for_future_safe(on_navigation_started)
+
+    # Check that the navigation id and url are identical for navigationStarted
+    # and downloadWillBegin.
+    assert download_event["navigation"] == navigation_event["navigation"]
+    assert download_event["url"] == navigation_event["url"]
+
+    # Assert file content is available.
+    with open(download_event["filepath"], mode="r", encoding="utf-8") as file:
+        file_content = file.read()
+    assert file_content == CONTENT
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/status.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/status.py
index 234448cff2f..2caa3c107df 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/status.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/download_end/status.py
@@ -40,7 +40,7 @@ async def test_status_complete(bidi_session, subscribe_events, new_tab, inline,
         {
             'filepath': any_string,
             'context': new_tab["context"],
-            'navigation': any_string,
+            'navigation': None,
             'status': 'complete',
             'timestamp': any_int,
             'url': download_link,
@@ -70,7 +70,7 @@ async def test_status_canceled(bidi_session, subscribe_events, new_tab, inline,
     recursive_compare(
         {
             'context': new_tab["context"],
-            'navigation': any_string,
+            'navigation': None,
             'status': 'canceled',
             'timestamp': any_int,
             'url': any_string,
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/conftest.py
index eafeb165642..e01f156824b 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/conftest.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/conftest.py
@@ -57,7 +57,7 @@ async def assert_fetch_user_agent(bidi_session, url):
     Helper to assert the right `user-agent` header sent in fetch.
     """
 
-    async def assert_navigation_user_agent(context, expected_user_agent):
+    async def assert_fetch_user_agent(context, expected_user_agent):
         echo_link = url("webdriver/tests/support/http_handlers/headers_echo.py")
         await bidi_session.browsing_context.navigate(context=context["context"],
                                                      url=echo_link,
@@ -75,7 +75,7 @@ async def assert_fetch_user_agent(bidi_session, url):
         assert user_agent == expected_user_agent, \
             f"Fetch expected to send user agent '{expected_user_agent}' but sent '{user_agent}'"
 
-    return assert_navigation_user_agent
+    return assert_fetch_user_agent
 
 
 @pytest_asyncio.fixture
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/global.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/global.py
index 374052f6574..c88c35c0f5c 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/global.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/global.py
@@ -68,7 +68,7 @@ async def test_user_agent_set_override_and_reset_globally_and_per_context(
 
     # Reset global override.
     await bidi_session.emulation.set_user_agent_override(
-        user_agent=ANOTHER_USER_AGENT
+        user_agent=None
     )
 
     # The override should be disabled.
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/user_contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/user_contexts.py
index a19bea7a825..97f36a928d3 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/user_contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_user_agent_override/user_contexts.py
@@ -136,7 +136,7 @@ async def test_set_to_user_context_and_then_to_context(bidi_session,
 
     # Remove user context override.
     await bidi_session.emulation.set_user_agent_override(
-        contexts=[context_in_user_context["context"]],
+        user_contexts=[user_context],
         user_agent=None,
     )
 
@@ -147,4 +147,4 @@ async def test_set_to_user_context_and_then_to_context(bidi_session,
     await bidi_session.browsing_context.reload(
         context=context_in_user_context["context"], wait="complete"
     )
-    await assert_user_agent(context_in_user_context, SOME_USER_AGENT)
+    await assert_user_agent(context_in_user_context, default_user_agent)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/before_request_sent/before_request_sent.py b/tests/wpt/tests/webdriver/tests/bidi/network/before_request_sent/before_request_sent.py
index 7e80fd72579..f7422e52d91 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/before_request_sent/before_request_sent.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/before_request_sent/before_request_sent.py
@@ -643,7 +643,7 @@ async def test_destination_initiator(
             },
         )
 
-    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "")
+    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "document")
     assert_initiator_destination(PAGE_INITIATOR["SCRIPT"], "script", "script")
     assert_initiator_destination(PAGE_INITIATOR["STYLESHEET"], "link", "style")
     assert_initiator_destination(PAGE_INITIATOR["IMAGE"], "img", "image")
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/charset.py b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/charset.py
index 3327ae63c18..d166a6ad3b6 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/charset.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/charset.py
@@ -1,4 +1,4 @@
-import webdriver.bidi.error as error
+import pytest
 
 from .. import PAGE_EMPTY_IMAGE, PAGE_EMPTY_TEXT, PAGE_OTHER_TEXT
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/collector.py b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/collector.py
index 700a94fa864..0e0217a9414 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/collector.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/collector.py
@@ -1,5 +1,4 @@
 import pytest
-import webdriver.bidi.error as error
 
 from .. import PAGE_EMPTY_TEXT
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/request.py b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/request.py
index da83b3ec720..3ac343eb278 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/request.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/request.py
@@ -26,3 +26,15 @@ async def test_request_base64_file(
 
     assert data["type"] == "base64"
     assert isinstance(data["value"], str)
+
+
+async def test_request_empty_response(
+    bidi_session, inline, setup_collected_response,
+):
+    empty_url = inline("", doctype="js")
+    [request, _] = await setup_collected_response(fetch_url=empty_url)
+
+    data = await bidi_session.network.get_data(request=request, data_type="response")
+
+    assert data["type"] == "string"
+    assert data["value"] == ""
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/provide_response/headers.py b/tests/wpt/tests/webdriver/tests/bidi/network/provide_response/headers.py
index 49248e56eea..3c32826b2d9 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/provide_response/headers.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/provide_response/headers.py
@@ -191,3 +191,44 @@ async def test_set_cookie_header_and_cookies_before_request_sent(
     recursive_compare(expected_cookie_from_cookies_param, cookie_from_cookies_param)
 
     await bidi_session.storage.delete_cookies()
+
+
+async def test_provide_response_cross_origin(
+    setup_blocked_request,
+    subscribe_events,
+    wait_for_event,
+    bidi_session,
+    wait_for_future_safe,
+    inline,
+):
+    request = await setup_blocked_request(
+        "beforeRequestSent",
+        blocked_url=inline("<div>test</div>", domain="alt"),
+        # Set an extra header so that the request is not considered as a simple
+        # request and triggers a CORS preflight.
+        # See https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS#simple_requests
+        headers={"X-OTHER": "a"},
+        has_preflight=True
+    )
+
+    await subscribe_events(
+        events=[
+            RESPONSE_STARTED_EVENT,
+            RESPONSE_COMPLETED_EVENT,
+        ]
+    )
+
+    on_response_started = wait_for_event(RESPONSE_STARTED_EVENT)
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+
+    await bidi_session.network.provide_response(
+        request=request,
+        status_code=200,
+        reason_phrase="OK",
+        headers=[
+            Header(name="access-control-allow-origin", value=NetworkStringValue("*")),
+        ],
+    )
+
+    await wait_for_future_safe(on_response_started)
+    await wait_for_future_safe(on_response_completed)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
index be1b5fc6b5d..fe851756617 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
@@ -684,7 +684,7 @@ async def test_destination_initiator(
             },
         )
 
-    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "")
+    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "document")
     assert_initiator_destination(PAGE_INITIATOR["SCRIPT"], "script", "script")
     assert_initiator_destination(PAGE_INITIATOR["STYLESHEET"], "link", "style")
     assert_initiator_destination(PAGE_INITIATOR["IMAGE"], "img", "image")
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py b/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
index 0b205f8fa84..dd948d2dc8d 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
@@ -621,7 +621,7 @@ async def test_destination_initiator(
             },
         )
 
-    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "")
+    assert_initiator_destination(PAGE_INITIATOR["HTML"], None, "document")
     assert_initiator_destination(PAGE_INITIATOR["SCRIPT"], "script", "script")
     assert_initiator_destination(PAGE_INITIATOR["STYLESHEET"], "link", "style")
     assert_initiator_destination(PAGE_INITIATOR["IMAGE"], "img", "image")
diff --git a/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py b/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
index e53c3324a48..94d7d44238b 100644
--- a/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
+++ b/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
@@ -23,6 +23,10 @@ from webdriver.bidi.error import (
     UnderspecifiedStoragePartitionException
 )
 from webdriver.bidi.modules.input import Actions
+from webdriver.bidi.modules.network import (
+    Header,
+    NetworkStringValue,
+)
 from webdriver.bidi.modules.script import ContextTarget
 from webdriver.error import TimeoutException
 
@@ -896,9 +900,12 @@ async def setup_blocked_request(
         blocked_url=None,
         navigate=False,
         navigate_url=None,
+        has_preflight=None,
         **kwargs,
     ):
-        await setup_network_test(events=[f"network.{phase}"])
+        await setup_network_test(
+            events=[f"network.{phase}"], contexts=[context["context"]]
+        )
 
         if blocked_url is None:
             if phase == "authRequired":
@@ -924,7 +931,6 @@ async def setup_blocked_request(
         )
 
         events = []
-
         async def on_event(method, data):
             events.append(data)
 
@@ -948,14 +954,48 @@ async def setup_blocked_request(
         # be received before the blocked request.
         def check_has_blocked_request(_):
             assert len(events) >= 1, "No BiDi events were received"
-            assert any(
-                e["isBlocked"] is True for e in events), "Not all requests are blocked"
+            blocked_events = [e for e in events if e["isBlocked"] is True]
+            assert len(blocked_events) >= 1, "No blocked request found"
+            return blocked_events[0]
 
         wait = AsyncPoll(bidi_session, timeout=2)
-        await wait.until(check_has_blocked_request)
+        blocked_event = await wait.until(check_has_blocked_request)
 
-        [blocked_event] = [e for e in events if e["isBlocked"] is True]
         request = blocked_event["request"]["request"]
+        method = blocked_event["request"]["method"]
+
+        # If the test expects a preflight and the method is OPTIONS, handle the
+        # preflight first in order to be able to block the actual request.
+        if has_preflight and method == "OPTIONS":
+            # Clear the events array, the preflight request will be unblocked
+            # and wait for the next blocked request.
+            events = []
+
+            # Provide a basic preflight response to allow any CORS request.
+            await bidi_session.network.provide_response(
+                request=request,
+                status_code=204,
+                reason_phrase="No Content",
+                headers=[
+                    Header(
+                        name="Access-Control-Allow-Headers",
+                        value=NetworkStringValue("*"),
+                    ),
+                    Header(
+                        name="Access-Control-Allow-Origin",
+                        value=NetworkStringValue("*"),
+                    ),
+                    Header(
+                        name="Access-Control-Allow-Methods",
+                        value=NetworkStringValue("*"),
+                    ),
+                ],
+            )
+
+            wait = AsyncPoll(bidi_session, timeout=2)
+            blocked_event = await wait.until(check_has_blocked_request)
+
+            request = blocked_event["request"]["request"]
 
         if phase == "authRequired":
             blocked_auth_requests.append(request)
diff --git a/tests/wpt/tests/webdriver/tests/support/http_handlers/headers.py b/tests/wpt/tests/webdriver/tests/support/http_handlers/headers.py
index cb8d18d9644..70739041d99 100644
--- a/tests/wpt/tests/webdriver/tests/support/http_handlers/headers.py
+++ b/tests/wpt/tests/webdriver/tests/support/http_handlers/headers.py
@@ -19,4 +19,7 @@ def main(request, response):
     if b"Content-Type" not in response.headers:
         response.headers.set(b"Content-Type", "text/plain")
 
-    response.content = "HTTP Response Headers"
+    if b"content" in request.GET:
+        response.content = request.GET.first(b"content")
+    else:
+        response.content = "HTTP Response Headers"
diff --git a/tests/wpt/tests/webdriver/tests/support/http_handlers/headers_echo.py b/tests/wpt/tests/webdriver/tests/support/http_handlers/headers_echo.py
index 02968f3f937..150a0155cec 100644
--- a/tests/wpt/tests/webdriver/tests/support/http_handlers/headers_echo.py
+++ b/tests/wpt/tests/webdriver/tests/support/http_handlers/headers_echo.py
@@ -5,7 +5,7 @@ def main(request, response):
     """Simple handler that returns a response with Cache-Control max-age=3600.
     """
 
-    response.headers.set(b"Content-Type", b"application/json")
+    response.headers.set(b"Content-Type", b"text/plain")
 
     headers_dict = {}
     for key, value in request.headers.items():
@@ -24,4 +24,3 @@ def main(request, response):
     response.content = json.dumps({
         "headers": headers_dict
     })
-
diff --git a/tests/wpt/tests/webidl/META.yml b/tests/wpt/tests/webidl/META.yml
index 686acbbc603..9a1192f6704 100644
--- a/tests/wpt/tests/webidl/META.yml
+++ b/tests/wpt/tests/webidl/META.yml
@@ -1,4 +1,3 @@
 spec: https://webidl.spec.whatwg.org/
 suggested_reviewers:
-  - domenic
   - yuki3
diff --git a/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js b/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
index cad019ac7d2..254e33eb9cc 100644
--- a/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
+++ b/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
@@ -1761,7 +1761,8 @@ const testExportToGPU = (testName) => {
       return;
     }
 
-    let anotherGPUDevice = await gpuAdapter.requestDevice();
+    let anotherGPUAdapter = await navigator.gpu.requestAdapter();
+    let anotherGPUDevice = await anotherGPUAdapter.requestDevice();
     let anotherMLContext = await navigator.ml.createContext(anotherGPUDevice);
 
     let mlTensor = await anotherMLContext.createTensor({
@@ -1790,7 +1791,8 @@ const testExportToGPU = (testName) => {
       return;
     }
 
-    let anotherGPUDevice = await gpuAdapter.requestDevice();
+    let anotherGPUAdapter = await navigator.gpu.requestAdapter();
+    let anotherGPUDevice = await anotherGPUAdapter.requestDevice();
     let anotherMLContext = await navigator.ml.createContext(anotherGPUDevice);
 
     let mlTensor = await anotherMLContext.createTensor({
@@ -1808,7 +1810,6 @@ const testExportToGPU = (testName) => {
 
     await promise_rejects_dom(
         t, 'InvalidStateError', anotherMLContext.exportToGPU(mlTensor));
-    await assert_tensor_data_equals(anotherMLContext, mlTensor, inputData);
   }, `${testName} / destroy device before export`);
 };
 
diff --git a/tests/wpt/tests/webnn/resources/minimum_datatype_set.json b/tests/wpt/tests/webnn/resources/minimum_datatype_set.json
index 39acc257965..f545cad46e1 100644
--- a/tests/wpt/tests/webnn/resources/minimum_datatype_set.json
+++ b/tests/wpt/tests/webnn/resources/minimum_datatype_set.json
@@ -8,7 +8,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "add": {
     "a": {
@@ -19,28 +22,40 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "argMax": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["int32"]}
+    "output": {
+      "dataTypes": ["int32"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "argMin": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["int32"]}
+    "output": {
+      "dataTypes": ["int32"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "averagePool2d": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 4, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "batchNormalization": {
     "input": {
@@ -63,35 +78,50 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 1}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 3, "max": 5}
+    }
   },
   "cast": {
     "input": {
       "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "ceil": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "clamp": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "concat": {
     "inputs": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "conv2d": {
     "bias": {
@@ -106,7 +136,10 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 4, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "convTranspose2d": {
     "input": {
@@ -121,21 +154,30 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 1}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "cos": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "cumulativeSum": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "dequantizeLinear": {
     "input": {
@@ -147,7 +189,10 @@
       "dataTypes": ["int32", "int8", "uint8"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32"]}
+    "output": {
+      "dataTypes": ["float32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "div": {
     "a": {
@@ -158,14 +203,20 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "elu": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "equal": {
     "a": {
@@ -176,35 +227,50 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "erf": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "exp": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "expand": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "floor": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "gather": {
     "input": {
@@ -212,7 +278,10 @@
       "rankRange": {"min": 1, "max": 5}
     },
     "indices": {"dataTypes": ["int32"], "rankRange": {"min": 0, "max": 5}},
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "gatherElements": {
     "input": {
@@ -220,7 +289,10 @@
       "rankRange": {"min": 1, "max": 5}
     },
     "indices": {"dataTypes": ["int32"], "rankRange": {"min": 1, "max": 5}},
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "gatherND": {
     "input": {
@@ -228,14 +300,20 @@
       "rankRange": {"min": 1, "max": 5}
     },
     "indices": {"dataTypes": ["int32"], "rankRange": {"min": 1, "max": 5}},
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "gelu": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "gemm": {
     "a": {
@@ -250,7 +328,10 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 2}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 2, "max": 2}
+    }
   },
   "greater": {
     "a": {
@@ -261,7 +342,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "greaterOrEqual": {
     "a": {
@@ -272,7 +356,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "gru": {
     "input": {
@@ -299,7 +386,14 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 3, "max": 3}
     },
-    "outputs": {"dataTypes": ["float32", "float16"]}
+    "output0": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 3, "max": 3}
+    },
+    "output1": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "gruCell": {
     "input": {
@@ -326,28 +420,40 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 1}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 2, "max": 2}
+    }
   },
   "hardSigmoid": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "hardSwish": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "identity": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "instanceNormalization": {
     "input": {
@@ -362,25 +468,37 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 1}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "isNaN": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "isInfinite": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "l2Pool2d": {
     "input": {"dataTypes": [], "rankRange": {}},
-    "output": {"dataTypes": []}
+    "output": {
+      "dataTypes": [],
+      "rankRange": {}
+    }
   },
   "layerNormalization": {
     "input": {
@@ -395,14 +513,20 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "leakyRelu": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "lesser": {
     "a": {
@@ -413,7 +537,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "lesserOrEqual": {
     "a": {
@@ -424,40 +551,61 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "linear": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "log": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "logicalAnd": {
     "a": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
     "b": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "logicalNot": {
     "a": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 5}},
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "logicalOr": {
     "a": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
     "b": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "logicalXor": {
     "a": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
     "b": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 4}},
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "lstm": {
     "input": {
@@ -492,7 +640,18 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 3, "max": 3}
     },
-    "outputs": {"dataTypes": ["float32", "float16"]}
+    "output0": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 3, "max": 3}
+    },
+    "output1": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 3, "max": 3}
+    },
+    "output2": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "lstmCell": {
     "input": {
@@ -527,7 +686,14 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 1}
     },
-    "outputs": {"dataTypes": ["float32", "float16"]}
+    "output0": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 2, "max": 2}
+    },
+    "output1": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 2, "max": 2}
+    }
   },
   "matmul": {
     "a": {
@@ -538,7 +704,10 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 2, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 2, "max": 5}
+    }
   },
   "max": {
     "a": {
@@ -549,14 +718,20 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "maxPool2d": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 4, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "min": {
     "a": {
@@ -567,7 +742,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "mul": {
     "a": {
@@ -578,14 +756,20 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "neg": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "notEqual": {
     "a": {
@@ -596,14 +780,20 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["uint8"]}
+    "output": {
+      "dataTypes": ["uint8"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "pad": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "pow": {
     "a": {
@@ -614,7 +804,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "prelu": {
     "input": {
@@ -625,126 +818,180 @@
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 4}
+    }
   },
   "quantizeLinear": {
     "input": {"dataTypes": ["float32"], "rankRange": {"min": 0, "max": 5}},
     "scale": {"dataTypes": ["float32"], "rankRange": {"min": 0, "max": 5}},
     "zeroPoint":
         {"dataTypes": ["int8", "uint8"], "rankRange": {"min": 0, "max": 5}},
-    "output": {"dataTypes": ["int8", "uint8"]}
+    "output": {
+      "dataTypes": ["int8", "uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reciprocal": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceL1": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceL2": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceLogSum": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceLogSumExp": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceMax": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceMean": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceMin": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceProduct": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceSum": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reduceSumSquare": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "relu": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "resample2d": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 4, "max": 4}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 4, "max": 4}
+    }
   },
   "reshape": {
     "input": {
       "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "reverse": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "roundEven": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "scatterElements": {
     "input": {
@@ -756,7 +1003,10 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "scatterND": {
     "input": {
@@ -766,69 +1016,99 @@
     "indices": {"dataTypes": ["int32"], "rankRange": {"min": 1, "max": 5}},
     "updates": {
       "dataTypes": ["float32", "float16", "int32"],
-      "rankRange": {"min": 1, "max": 5}
+      "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "sigmoid": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "sign": {
     "input": {"dataTypes": [], "rankRange": {"min": 0, "max": 0}},
-    "output": {"dataTypes": []}
+    "output": {
+      "dataTypes": [],
+      "rankRange": {"min": 0, "max": 0}
+    }
   },
   "sin": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "slice": {
     "input": {
       "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32", "int8", "uint8"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32", "int8", "uint8"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "softmax": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 1, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 1, "max": 5}
+    }
   },
   "softplus": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "softsign": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "split": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "outputs": {"dataTypes": ["float32", "float16", "int32"]}
+    "outputs": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "sqrt": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "sub": {
     "a": {
@@ -839,42 +1119,60 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "tan": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "tanh": {
     "input": {
       "dataTypes": ["float32", "float16"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16"]}
+    "output": {
+      "dataTypes": ["float32", "float16"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "tile": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "transpose": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   },
   "triangular": {
     "input": {
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 2, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 2, "max": 5}
+    }
   },
   "where": {
     "condition": {"dataTypes": ["uint8"], "rankRange": {"min": 0, "max": 5}},
@@ -886,6 +1184,9 @@
       "dataTypes": ["float32", "float16", "int32"],
       "rankRange": {"min": 0, "max": 5}
     },
-    "output": {"dataTypes": ["float32", "float16", "int32"]}
+    "output": {
+      "dataTypes": ["float32", "float16", "int32"],
+      "rankRange": {"min": 0, "max": 5}
+    }
   }
 }
diff --git a/tests/wpt/tests/webnn/resources/utils.js b/tests/wpt/tests/webnn/resources/utils.js
index cdf1fe9bce7..6b24f2d6efb 100644
--- a/tests/wpt/tests/webnn/resources/utils.js
+++ b/tests/wpt/tests/webnn/resources/utils.js
@@ -697,14 +697,19 @@ function validateContextSupportsGraph(context, graph) {
   const supportLimits = context.opSupportLimits();
   const castOpSupportLimits = supportLimits.cast;
   const inputDataTypes = supportLimits.input.dataTypes;
+  const inputRankRange = supportLimits.input.rankRange;
   const constantDataTypes = supportLimits.constant.dataTypes;
+  const constantRankRange = supportLimits.constant.rankRange;
   const outputDataTypes = supportLimits.output.dataTypes;
+  const outputRankRange = supportLimits.output.rankRange;
 
   function validateInputOrConstantDataTypeAndRank(
       inputName, operatorSupportLimits, operand) {
     const inputDescriptor = graph.inputs[inputName].descriptor;
     const inputDataType = inputDescriptor.dataType;
+    const inputRank = inputDescriptor.shape.length;
     if (inputDescriptor.constant) {
+      // Check graph constant data type
       if (!constantDataTypes.includes(inputDataType) &&
           !findCompatibleType(
               inputDataType, constantDataTypes, castOpSupportLimits)) {
@@ -712,7 +717,18 @@ function validateContextSupportsGraph(context, graph) {
             `Unsupported data type, constant '${operand}' data type ${
                 inputDataType} must be one of [${constantDataTypes}].`);
       }
+
+      // Check graph constant rank
+      if (inputRank < constantRankRange.min) {
+        throw new TypeError(`Unsupported rank ${inputRank} for constant '${
+            operand}' (must be at least ${constantRankRange.min}).`);
+      }
+      if (inputRank > constantRankRange.max) {
+        throw new TypeError(`Unsupported rank ${inputRank} for constant '${
+            operand}' (must be at most ${constantRankRange.max}).`);
+      }
     } else {
+      // Check graph input data type
       if (!inputDataTypes.includes(inputDataType) &&
           !findCompatibleType(
               inputDataType, inputDataTypes, castOpSupportLimits)) {
@@ -720,9 +736,20 @@ function validateContextSupportsGraph(context, graph) {
             `Unsupported data type, input '${operand}' data type ${
                 inputDataType} must be one of [${inputDataTypes}].`);
       }
+
+      // Check graph input rank
+      if (inputRank < inputRankRange.min) {
+        throw new TypeError(`Unsupported rank ${inputRank} for input '${
+            operand}' (must be at least ${inputRankRange.min}).`);
+      }
+      if (inputRank > inputRankRange.max) {
+        throw new TypeError(`Unsupported rank ${inputRank} for input '${
+            operand}' (must be at most ${inputRankRange.max}).`);
+      }
     }
 
     const operandSupportLimits = operatorSupportLimits[operand];
+    // Check operand data type
     const inputOperandDataTypes = operandSupportLimits.dataTypes;
     if (!inputOperandDataTypes.includes(inputDataType) &&
         !findCompatibleType(
@@ -732,7 +759,7 @@ function validateContextSupportsGraph(context, graph) {
               inputDataType} must be one of [${inputOperandDataTypes}].`);
     }
 
-    const inputRank = inputDescriptor.shape.length;
+    // Check operand rank
     const limitsRankRange = operandSupportLimits.rankRange;
     if (inputRank < limitsRankRange.min) {
       throw new TypeError(`Unsupported rank ${inputRank} for argument ${
@@ -745,9 +772,13 @@ function validateContextSupportsGraph(context, graph) {
     }
   }
 
-  function validateOutputDataType(outputName, operatorSupportLimits, operand) {
+  function validateOutputDataTypeAndRank(
+      outputName, operatorSupportLimits, operand) {
     const outputDataType =
         graph.expectedOutputs[outputName].descriptor.dataType;
+    const outputRank =
+        graph.expectedOutputs[outputName].descriptor.shape.length;
+    // Check graph output data type
     if (!outputDataTypes.includes(outputDataType) &&
         !findCompatibleType(
             outputDataType, outputDataTypes, castOpSupportLimits)) {
@@ -756,6 +787,17 @@ function validateContextSupportsGraph(context, graph) {
               outputDataType} must be one of [${outputDataTypes}].`);
     }
 
+    // Check graph output rank
+    if (outputRank < outputRankRange.min) {
+      throw new TypeError(`Unsupported rank ${outputRank} for output '${
+          operand}' (must be at least ${outputRankRange.min}).`);
+    }
+    if (outputRank > outputRankRange.max) {
+      throw new TypeError(`Unsupported rank ${outputRank} for output '${
+          operand}' (must be at most ${outputRankRange.max}).`);
+    }
+
+    // Check output operand data type
     const outputOperandDataTypes = operatorSupportLimits[operand].dataTypes;
     if (!outputOperandDataTypes.includes(outputDataType) &&
         !findCompatibleType(
@@ -764,6 +806,17 @@ function validateContextSupportsGraph(context, graph) {
           `Unsupported data type, output '${operand}' data type ${
               outputDataType} must be one of [${outputOperandDataTypes}].`);
     }
+
+    // Check output operand rank
+    const outputOperandRankRange = operatorSupportLimits[operand].rankRange;
+    if (outputRank < outputOperandRankRange.min) {
+      throw new TypeError(`Unsupported rank ${outputRank} for output '${
+          operand}' (must be at least ${outputOperandRankRange.min}).`);
+    }
+    if (outputRank > outputOperandRankRange.max) {
+      throw new TypeError(`Unsupported rank ${outputRank} for output '${
+          operand}' (must be at most ${outputOperandRankRange.max}).`);
+    }
   }
 
   try {
@@ -780,10 +833,10 @@ function validateContextSupportsGraph(context, graph) {
             // intermediate output
             continue;
           }
-          validateOutputDataType(
+          validateOutputDataTypeAndRank(
               operator.outputs, operatorSupportLimits, 'output');
         } else if (operand === 'outputs') {
-          // multiples output operands
+          // multiple output operands of split operator
           assert(
               Array.isArray(operator.outputs),
               `the outputs of ${operatorName} should be a string array.`);
@@ -795,9 +848,19 @@ function validateContextSupportsGraph(context, graph) {
               // intermediate output
               continue;
             }
-            validateOutputDataType(
+            validateOutputDataTypeAndRank(
                 outputName, operatorSupportLimits, 'outputs');
           }
+        } else if (/output[0-2]/.test(operand)) {
+          // multiple output operands of gru/lstm/lstmCell operators
+          assert(
+              Array.isArray(operator.outputs),
+              `the outputs of ${operatorName} should be a string array.`);
+          const index = parseInt(operand.match(/output([0-2])/)[1]);
+          if (index < operator.outputs.length) {
+            validateOutputDataTypeAndRank(
+                operator.outputs[index], operatorSupportLimits, operand);
+          }
         } else {
           // input operand(s)
           if (operatorName === 'concat') {
@@ -1260,12 +1323,12 @@ const getResample2dPrecisionTolerance =
 
 let minimumDataTypeSet;
 
-function checkMinimum(descriptor, operandMinimumLimits, isInput = true) {
+function checkMinimum(descriptor, operandMinimumLimits) {
   const targetRank = descriptor.shape.length;
   const targetDataType = descriptor.dataType;
   let isMinimum = operandMinimumLimits.dataTypes.includes(targetDataType);
 
-  if (isMinimum && isInput) {
+  if (isMinimum) {
     isMinimum = operandMinimumLimits.rankRange.min <= targetRank &&
         targetRank <= operandMinimumLimits.rankRange.max;
   }
@@ -1275,24 +1338,30 @@ function checkMinimum(descriptor, operandMinimumLimits, isInput = true) {
 
 function getOutputMinimumLimits(operatorsResources, outputOperandName) {
   let operatorName;
-  let outputsName;
+  let outputName;
   for (let operator of operatorsResources) {
     if (typeof operator.outputs === 'string' &&
         operator.outputs === outputOperandName) {
       operatorName = operator.name;
-      outputsName = 'output';
+      outputName = 'output';
       break;
     } else if (
         Array.isArray(operator.outputs) &&
         operator.outputs.includes(outputOperandName)) {
       // Current gru, lstm, lstmCell and split operators have multiple outputs
       operatorName = operator.name;
-      outputsName = 'outputs';
+      if (minimumDataTypeSet[operatorName].hasOwnProperty('outputs')) {
+        // for split operator
+        outputName = 'outputs';
+      } else {
+        // for gru, lstm, lstmCell operators
+        outputName = `output${operator.outputs.indexOf(outputOperandName)}`;
+      }
       break;
     }
   }
 
-  return minimumDataTypeSet[operatorName][outputsName];
+  return minimumDataTypeSet[operatorName][outputName];
 }
 
 async function getMinimumDataTypeSetJson() {
@@ -1367,7 +1436,7 @@ function isMinimumTest(test) {
   for (let [outputOperandName, value] of Object.entries(outputsResources)) {
     const outputMinimumLimits =
         getOutputMinimumLimits(graphResources.operators, outputOperandName)
-    isMinimum = checkMinimum(value.descriptor, outputMinimumLimits, false);
+    isMinimum = checkMinimum(value.descriptor, outputMinimumLimits);
     if (!isMinimum) {
       return isMinimum;
     }
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/bold_object/bold_animation_with_timestamp.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/bold_object/bold_animation_with_timestamp.html
index 8ba96727f8e..c09c34f1cc2 100644
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/bold_object/bold_animation_with_timestamp.html
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/bold_object/bold_animation_with_timestamp.html
@@ -6,17 +6,8 @@
 html { overflow:hidden }
 body { margin:0 }
 ::cue(b:past) {
-    -o-animation: test 9s steps(2, start);
     animation: test 9s steps(2, start);
 }
-@-o-keyframes test {
-    0% {
-        color: #ffffff;
-    }
-    100% {
-        color: #00ff00;
-    }
-}
 @keyframes test {
     0% {
         color: #ffffff;
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/class_object/class_animation_with_timestamp.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/class_object/class_animation_with_timestamp.html
index 3313941fc3a..3ffb4790db5 100644
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/class_object/class_animation_with_timestamp.html
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/class_object/class_animation_with_timestamp.html
@@ -6,17 +6,8 @@
 html { overflow:hidden }
 body { margin:0 }
 ::cue(c:past) {
-    -o-animation: test 9s steps(2, start);
     animation: test 9s steps(2, start);
 }
-@-o-keyframes test {
-    0% {
-        color: #ffffff;
-    }
-    100% {
-        color: #00ff00;
-    }
-}
 @keyframes test {
     0% {
         color: #ffffff;
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_animation_with_timestamp.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_animation_with_timestamp.html
index 42a44d437b3..bd55b44518c 100644
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_animation_with_timestamp.html
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_animation_with_timestamp.html
@@ -6,17 +6,8 @@
 html { overflow:hidden }
 body { margin:0 }
 ::cue(i:past) {
-    -o-animation: test 9s steps(2, start);
     animation: test 9s steps(2, start);
 }
-@-o-keyframes test {
-    0% {
-        color: #ffffff;
-    }
-    100% {
-        color: #00ff00;
-    }
-}
 @keyframes test {
     0% {
         color: #ffffff;
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_animation_with_timestamp.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_animation_with_timestamp.html
index c4584b30148..f328d1de003 100644
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_animation_with_timestamp.html
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_animation_with_timestamp.html
@@ -6,17 +6,8 @@
 html { overflow:hidden }
 body { margin:0 }
 ::cue(u:past) {
-    -o-animation: test 9s steps(2, start);
     animation: test 9s steps(2, start);
 }
-@-o-keyframes test {
-    0% {
-        color: #ffffff;
-    }
-    100% {
-        color: #00ff00;
-    }
-}
 @keyframes test {
     0% {
         color: #ffffff;
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_animation_with_timestamp.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_animation_with_timestamp.html
index 09baf69c01e..d680cb86c32 100644
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_animation_with_timestamp.html
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_animation_with_timestamp.html
@@ -6,17 +6,8 @@
 html { overflow:hidden }
 body { margin:0 }
 ::cue(v:past) {
-    -o-animation: test 9s steps(2, start);
     animation: test 9s steps(2, start);
 }
-@-o-keyframes test {
-    0% {
-        color: #ffffff;
-    }
-    100% {
-        color: #00ff00;
-    }
-}
 @keyframes test {
     0% {
         color: #ffffff;
diff --git a/tests/wpt/tests/worklets/META.yml b/tests/wpt/tests/worklets/META.yml
index b037fe099b1..5dcb44de0ae 100644
--- a/tests/wpt/tests/worklets/META.yml
+++ b/tests/wpt/tests/worklets/META.yml
@@ -1,4 +1,3 @@
 spec: https://html.spec.whatwg.org/multipage/worklets.html
 suggested_reviewers:
   - bfgeek
-  - domenic
diff --git a/tests/wpt/tests/x-frame-options/META.yml b/tests/wpt/tests/x-frame-options/META.yml
index 622213edadb..1c8db5dca8f 100644
--- a/tests/wpt/tests/x-frame-options/META.yml
+++ b/tests/wpt/tests/x-frame-options/META.yml
@@ -2,4 +2,3 @@ spec: https://html.spec.whatwg.org/multipage/browsing-the-web.html#the-x-frame-o
 suggested_reviewers:
   - annevk
   - mikewest
-  - domenic