From a7e62acbe8ddae59a2592e45b78c11e2b5dc5407 Mon Sep 17 00:00:00 2001
From: WPT Sync Bot <josh+wptsync@joshmatthews.net>
Date: Thu, 14 Feb 2019 20:36:47 -0500
Subject: [PATCH] Update web-platform-tests to revision
 ad219567030d1f99f7310f52a17546b57b70d29e

---
 tests/wpt/metadata/MANIFEST.json              | 740 ++++++++++++++++--
 .../scroll-behavior-smooth.html.ini           |   6 +
 .../reactions/HTMLBaseElement.html.ini        |   7 +
 .../XMLSerializer-serializeToString.html.ini  |  21 +
 .../fetch.tentative.https.sub.html.ini        |   9 +
 .../script.tentative.https.sub.html.ini       |   3 +
 .../style.tentative.https.sub.html.ini        |   3 +
 .../track.tentative.https.sub.html.ini        |   3 +
 ...-return-value-undefined.tentative.html.ini |   5 -
 .../traverse_the_history_5.html.ini           |   4 -
 ...ocument_domain_access_details.sub.html.ini |  31 +
 .../name-attribute.window.js.ini              |   4 +
 .../document-write/iframe_005.html.ini        |   4 -
 .../web-platform-tests/.azure-pipelines.yml   |  14 +-
 .../animator-animate.https.html               |  22 +
 .../animator-with-options.https.html          |  35 +
 tests/wpt/web-platform-tests/common/sleep.py  |   6 +-
 .../securitypolicyviolation/targeting.html    |   4 +-
 ...ion-absolute-dynamic-containing-block.html | 140 ++++
 .../css/css-values/rgba-011.html              |  54 ++
 .../reactions/HTMLBaseElement.html            |  21 +
 .../reactions/HTMLButtonElement.html          |  46 +-
 .../reactions/resources/reactions.js          |  35 +
 .../XMLSerializer-serializeToString.html      |  93 +++
 .../element-timing/observe-svg-image.html     |  30 +
 .../embed.tentative.https.sub.html            |   6 +-
 .../fetch.tentative.https.sub.html            |  50 +-
 .../font.tentative.https.sub.html             |   6 +-
 .../iframe.tentative.https.sub.html           |   9 +-
 .../sec-metadata/iframe.tentative.sub.html    |   9 +-
 .../sec-metadata/img.tentative.https.sub.html |   9 +-
 .../object.tentative.https.sub.html           |   6 +-
 ...oss-site-redirect.tentative.https.sub.html |   6 +-
 ...direct-cross-site.tentative.https.sub.html |   2 +-
 ...edirect-same-site.tentative.https.sub.html |   2 +-
 ...e-origin-redirect.tentative.https.sub.html |   6 +-
 ...ame-site-redirect.tentative.https.sub.html |   6 +-
 .../report.tentative.https.sub.html           |   6 +-
 .../fetch/sec-metadata/resources/helper.js    |   3 +-
 .../script.tentative.https.sub.html           |  24 +-
 .../sec-metadata/script.tentative.sub.html    |   9 +-
 .../serviceworker.tentative.https.sub.html    |   2 +-
 .../sharedworker.tentative.https.sub.html     |   2 +-
 .../style.tentative.https.sub.html            |  27 +-
 .../track.tentative.https.sub.html            |  47 +-
 .../window-open.tentative.https.sub.html      |  18 +-
 .../worker.tentative.https.sub.html           |   2 +-
 .../xslt.tentative.https.sub.html             |   6 +-
 .../document_domain_access_details.sub.html   | 193 +++++
 .../support/document_domain_frame.html        |  52 ++
 .../support/document_domain_frame.sub.js      |  65 ++
 .../name-attribute.window.js                  |  18 +
 .../the-a-element/a.rel-setter-01.html        |   4 +-
 .../navigator_user_agent.tentative.html       |   8 +
 .../navigator_user_agent.tentative.https.html |  21 +
 .../import-maps/@std/__dir__.headers          |   1 +
 .../web-platform-tests/import-maps/@std/blank |   1 +
 .../web-platform-tests/import-maps/@std/none  |   1 +
 .../web-platform-tests/import-maps/README.md  |   9 +
 .../dynamic-import/success.tentative.html     |  31 +
 .../script-tag/success.tentative.html         |  25 +
 .../worker-request/success.tentative.html     |  25 +
 .../import-maps/bare.sub.tentative.html       |  70 ++
 .../import-maps/bare/__dir__.headers          |   1 +
 .../web-platform-tests/import-maps/bare/bare  |   1 +
 .../web-platform-tests/import-maps/bare/blank |   1 +
 .../import-maps/bare/cross-origin-bare        |   1 +
 .../web-platform-tests/import-maps/bare/none  |   1 +
 .../import-maps/bare/std-blank                |   1 +
 .../import-maps/bare/std-none                 |   1 +
 .../import-maps/bare/to-bare                  |   1 +
 .../import-maps/bare/to-data                  |   1 +
 .../import-maps/builtin-empty.tentative.html  |  43 +
 .../builtin-import-scheme.tentative.html      |  27 +
 .../import-maps/builtin.tentative.html        |  30 +
 .../import-maps/data.sub.tentative.html       |  72 ++
 .../fallback-disallowed.sub.tentative.html    |  79 ++
 .../import-maps/fallback.sub.tentative.html   |  84 ++
 .../import-maps/http.sub.tentative.html       |  72 ++
 .../import-maps/module-map-key.tentative.html |  25 +
 .../import-maps/resolving.tentative.html      |  81 ++
 .../import-maps/resources/empty.js            |   0
 .../import-maps/resources/log.js              |   1 +
 .../import-maps/resources/log.js.headers      |   1 +
 .../import-maps/resources/resolving.js        | 206 +++++
 .../import-maps/resources/test-helper.js      | 205 +++++
 .../import-maps/static-import.js              |   1 +
 .../web-platform-tests/interfaces/webxr.idl   |  21 +-
 .../intersection-observer-test-utils.js       |  26 +-
 .../resources/v2-subframe.html                |  32 +
 .../v2/animated-occlusion.html                |  72 ++
 .../intersection-observer/v2/blur-filter.html |  64 ++
 .../intersection-observer/v2/box-shadow.html  |  66 ++
 .../v2/cross-origin-effects.sub.html          |  64 ++
 .../v2/cross-origin-occlusion.sub.html        |  68 ++
 .../intersection-observer/v2/delay-test.html  |  75 ++
 .../v2/iframe-target.html                     |  44 ++
 .../v2/simple-effects.html                    |  71 ++
 .../simple-occlusion-svg-foreign-object.html  |  70 ++
 .../v2/simple-occlusion.html                  |  66 ++
 .../intersection-observer/v2/text-shadow.html |  69 ++
 .../layout-stability/buffer-layout-jank.html  |  39 +
 .../layout-stability/observe-layoutjank.html  |  34 +
 .../layout-stability/resources/slow-image.py  |   6 +
 .../supported-layout-type.html                |  17 +
 tests/wpt/web-platform-tests/lint.whitelist   |   1 +
 .../empty-data-manual.https.html              |  11 +-
 ...t-request-canmakepayment-method.https.html |   2 +-
 .../payment-request/META.yml                  |   1 +
 ...ent-request-abort-method-manual.https.html |  95 ---
 .../payment-request-abort-method.https.html   |  40 +
 ...st-canmakepayment-method-manual.https.html | 105 ---
 ...t-request-canmakepayment-method.https.html |  35 +
 ...nrolledinstrument-method-manual.https.html |  51 --
 ...st-hasenrolledinstrument-method.https.html |  41 +-
 .../rejects_if_not_active.https.html          |  91 +--
 .../rejects_if_not_active_manual.https.html   | 164 ++++
 .../disable-picture-in-picture.html           |   4 +-
 .../screen-orientation/lock-basic.html        |  14 +
 .../screen-orientation/onchange-event.html    |   8 +
 ...message-to-client-message-queue.https.html |  15 +-
 .../resources/generate-test-sxgs.sh           |   3 +
 .../sxg/sxg-merkle-integrity-error.sxg        | Bin 0 -> 999 bytes
 .../sxg-merkle-integrity-error.tentative.html |  24 +
 ...etch-merkle-integrity-error.tentative.html |  26 +
 .../web-platform-tests/tools/wpt/browser.py   |   4 +-
 .../wptrunner/executors/executormarionette.py |  25 +-
 .../wptrunner/wptrunner/executors/protocol.py |  11 +-
 .../tools/wptrunner/wptrunner/testrunner.py   |   8 +-
 129 files changed, 4156 insertions(+), 590 deletions(-)
 create mode 100644 tests/wpt/metadata/custom-elements/reactions/HTMLBaseElement.html.ini
 delete mode 100644 tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
 delete mode 100644 tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
 create mode 100644 tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
 create mode 100644 tests/wpt/metadata/html/browsers/the-window-object/name-attribute.window.js.ini
 delete mode 100644 tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
 create mode 100644 tests/wpt/web-platform-tests/animation-worklet/animator-animate.https.html
 create mode 100644 tests/wpt/web-platform-tests/animation-worklet/animator-with-options.https.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-position/position-absolute-dynamic-containing-block.html
 create mode 100644 tests/wpt/web-platform-tests/css/css-values/rgba-011.html
 create mode 100644 tests/wpt/web-platform-tests/custom-elements/reactions/HTMLBaseElement.html
 create mode 100644 tests/wpt/web-platform-tests/element-timing/observe-svg-image.html
 create mode 100644 tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html
 create mode 100644 tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html
 create mode 100644 tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js
 create mode 100644 tests/wpt/web-platform-tests/html/browsers/the-window-object/name-attribute.window.js
 create mode 100644 tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/@std/__dir__.headers
 create mode 100644 tests/wpt/web-platform-tests/import-maps/@std/blank
 create mode 100644 tests/wpt/web-platform-tests/import-maps/@std/none
 create mode 100644 tests/wpt/web-platform-tests/import-maps/README.md
 create mode 100644 tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/script-tag/success.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/worker-request/success.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare.sub.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/__dir__.headers
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/bare
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/blank
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/cross-origin-bare
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/none
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/std-blank
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/std-none
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/to-bare
 create mode 100644 tests/wpt/web-platform-tests/import-maps/bare/to-data
 create mode 100644 tests/wpt/web-platform-tests/import-maps/builtin-empty.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/builtin-import-scheme.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/builtin.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/data.sub.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/fallback-disallowed.sub.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/fallback.sub.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/http.sub.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/module-map-key.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resolving.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resources/empty.js
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resources/log.js
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resources/log.js.headers
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resources/resolving.js
 create mode 100644 tests/wpt/web-platform-tests/import-maps/resources/test-helper.js
 create mode 100644 tests/wpt/web-platform-tests/import-maps/static-import.js
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/resources/v2-subframe.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/animated-occlusion.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/blur-filter.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/box-shadow.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-effects.sub.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-occlusion.sub.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/delay-test.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/iframe-target.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/simple-effects.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion-svg-foreign-object.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion.html
 create mode 100644 tests/wpt/web-platform-tests/intersection-observer/v2/text-shadow.html
 create mode 100644 tests/wpt/web-platform-tests/layout-stability/buffer-layout-jank.html
 create mode 100644 tests/wpt/web-platform-tests/layout-stability/observe-layoutjank.html
 create mode 100644 tests/wpt/web-platform-tests/layout-stability/resources/slow-image.py
 create mode 100644 tests/wpt/web-platform-tests/layout-stability/supported-layout-type.html
 delete mode 100644 tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html
 delete mode 100644 tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method-manual.https.html
 create mode 100644 tests/wpt/web-platform-tests/payment-request/rejects_if_not_active_manual.https.html
 create mode 100644 tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg
 create mode 100644 tests/wpt/web-platform-tests/signed-exchange/sxg-merkle-integrity-error.tentative.html
 create mode 100644 tests/wpt/web-platform-tests/signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html

diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 679f3f4d974..74dbb217fab 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -13537,18 +13537,6 @@
      {}
     ]
    ],
-   "payment-request/payment-request-abort-method-manual.https.html": [
-    [
-     "/payment-request/payment-request-abort-method-manual.https.html",
-     {}
-    ]
-   ],
-   "payment-request/payment-request-canmakepayment-method-manual.https.html": [
-    [
-     "/payment-request/payment-request-canmakepayment-method-manual.https.html",
-     {}
-    ]
-   ],
    "payment-request/payment-request-hasenrolledinstrument-method-manual.https.html": [
     [
      "/payment-request/payment-request-hasenrolledinstrument-method-manual.https.html",
@@ -292208,6 +292196,16 @@
      {}
     ]
    ],
+   "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html": [
+    [
+     {}
+    ]
+   ],
+   "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js": [
+    [
+     {}
+    ]
+   ],
    "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_setter_iframe.html": [
     [
      {}
@@ -301813,6 +301811,101 @@
      {}
     ]
    ],
+   "import-maps/@std/__dir__.headers": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/@std/blank": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/@std/none": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/README.md": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/__dir__.headers": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/bare": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/blank": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/cross-origin-bare": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/none": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/std-blank": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/std-none": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/to-bare": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/bare/to-data": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/resources/empty.js": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/resources/log.js": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/resources/log.js.headers": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/resources/resolving.js": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/resources/test-helper.js": [
+    [
+     {}
+    ]
+   ],
+   "import-maps/static-import.js": [
+    [
+     {}
+    ]
+   ],
    "infrastructure/META.yml": [
     [
      {}
@@ -302798,6 +302891,11 @@
      {}
     ]
    ],
+   "intersection-observer/resources/v2-subframe.html": [
+    [
+     {}
+    ]
+   ],
    "js/META.yml": [
     [
      {}
@@ -302858,6 +302956,11 @@
      {}
     ]
    ],
+   "layout-stability/resources/slow-image.py": [
+    [
+     {}
+    ]
+   ],
    "lifecycle/META.yml": [
     [
      {}
@@ -313818,6 +313921,11 @@
      {}
     ]
    ],
+   "signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg": [
+    [
+     {}
+    ]
+   ],
    "signed-exchange/resources/sxg/sxg-noncacheable.sxg": [
     [
      {}
@@ -336657,6 +336765,18 @@
      {}
     ]
    ],
+   "animation-worklet/animator-animate.https.html": [
+    [
+     "/animation-worklet/animator-animate.https.html",
+     {}
+    ]
+   ],
+   "animation-worklet/animator-with-options.https.html": [
+    [
+     "/animation-worklet/animator-with-options.https.html",
+     {}
+    ]
+   ],
    "animation-worklet/current-time.https.html": [
     [
      "/animation-worklet/current-time.https.html",
@@ -347309,6 +347429,12 @@
      {}
     ]
    ],
+   "css/css-position/position-absolute-dynamic-containing-block.html": [
+    [
+     "/css/css-position/position-absolute-dynamic-containing-block.html",
+     {}
+    ]
+   ],
    "css/css-position/position-absolute-in-inline-crash.html": [
     [
      "/css/css-position/position-absolute-in-inline-crash.html",
@@ -353701,6 +353827,12 @@
      {}
     ]
    ],
+   "css/css-values/rgba-011.html": [
+    [
+     "/css/css-values/rgba-011.html",
+     {}
+    ]
+   ],
    "css/css-values/unset-value-storage.html": [
     [
      "/css/css-values/unset-value-storage.html",
@@ -356671,6 +356803,12 @@
      {}
     ]
    ],
+   "custom-elements/reactions/HTMLBaseElement.html": [
+    [
+     "/custom-elements/reactions/HTMLBaseElement.html",
+     {}
+    ]
+   ],
    "custom-elements/reactions/HTMLButtonElement.html": [
     [
      "/custom-elements/reactions/HTMLButtonElement.html",
@@ -359727,6 +359865,12 @@
      {}
     ]
    ],
+   "element-timing/observe-svg-image.html": [
+    [
+     "/element-timing/observe-svg-image.html",
+     {}
+    ]
+   ],
    "element-timing/progressively-loaded-image.html": [
     [
      "/element-timing/progressively-loaded-image.html",
@@ -372561,6 +372705,12 @@
      {}
     ]
    ],
+   "html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html": [
+    [
+     "/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html",
+     {}
+    ]
+   ],
    "html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_feature_policy.tentative.sub.html": [
     [
      "/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_feature_policy.tentative.sub.html",
@@ -372849,6 +372999,12 @@
      {}
     ]
    ],
+   "html/browsers/the-window-object/name-attribute.window.js": [
+    [
+     "/html/browsers/the-window-object/name-attribute.window.html",
+     {}
+    ]
+   ],
    "html/browsers/the-window-object/named-access-on-the-window-object/named-objects.html": [
     [
      "/html/browsers/the-window-object/named-access-on-the-window-object/named-objects.html",
@@ -384675,6 +384831,18 @@
      {}
     ]
    ],
+   "html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html": [
+    [
+     "/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html",
+     {}
+    ]
+   ],
+   "html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html": [
+    [
+     "/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html",
+     {}
+    ]
+   ],
    "html/webappapis/system-state-and-capabilities/the-navigator-object/navigatorcookies-cookieenabled-true.html": [
     [
      "/html/webappapis/system-state-and-capabilities/the-navigator-object/navigatorcookies-cookieenabled-true.html",
@@ -384795,6 +384963,84 @@
      {}
     ]
    ],
+   "import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html": [
+    [
+     "/import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/acquire-import-maps-flag/script-tag/success.tentative.html": [
+    [
+     "/import-maps/acquire-import-maps-flag/script-tag/success.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/acquire-import-maps-flag/worker-request/success.tentative.html": [
+    [
+     "/import-maps/acquire-import-maps-flag/worker-request/success.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/bare.sub.tentative.html": [
+    [
+     "/import-maps/bare.sub.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/builtin-empty.tentative.html": [
+    [
+     "/import-maps/builtin-empty.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/builtin-import-scheme.tentative.html": [
+    [
+     "/import-maps/builtin-import-scheme.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/builtin.tentative.html": [
+    [
+     "/import-maps/builtin.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/data.sub.tentative.html": [
+    [
+     "/import-maps/data.sub.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/fallback-disallowed.sub.tentative.html": [
+    [
+     "/import-maps/fallback-disallowed.sub.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/fallback.sub.tentative.html": [
+    [
+     "/import-maps/fallback.sub.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/http.sub.tentative.html": [
+    [
+     "/import-maps/http.sub.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/module-map-key.tentative.html": [
+    [
+     "/import-maps/module-map-key.tentative.html",
+     {}
+    ]
+   ],
+   "import-maps/resolving.tentative.html": [
+    [
+     "/import-maps/resolving.tentative.html",
+     {}
+    ]
+   ],
    "inert/inert-does-not-match-disabled-selector.tentative.html": [
     [
      "/inert/inert-does-not-match-disabled-selector.tentative.html",
@@ -385235,6 +385481,72 @@
      {}
     ]
    ],
+   "intersection-observer/v2/animated-occlusion.html": [
+    [
+     "/intersection-observer/v2/animated-occlusion.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/blur-filter.html": [
+    [
+     "/intersection-observer/v2/blur-filter.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/box-shadow.html": [
+    [
+     "/intersection-observer/v2/box-shadow.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/cross-origin-effects.sub.html": [
+    [
+     "/intersection-observer/v2/cross-origin-effects.sub.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/cross-origin-occlusion.sub.html": [
+    [
+     "/intersection-observer/v2/cross-origin-occlusion.sub.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/delay-test.html": [
+    [
+     "/intersection-observer/v2/delay-test.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/iframe-target.html": [
+    [
+     "/intersection-observer/v2/iframe-target.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/simple-effects.html": [
+    [
+     "/intersection-observer/v2/simple-effects.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/simple-occlusion-svg-foreign-object.html": [
+    [
+     "/intersection-observer/v2/simple-occlusion-svg-foreign-object.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/simple-occlusion.html": [
+    [
+     "/intersection-observer/v2/simple-occlusion.html",
+     {}
+    ]
+   ],
+   "intersection-observer/v2/text-shadow.html": [
+    [
+     "/intersection-observer/v2/text-shadow.html",
+     {}
+    ]
+   ],
    "intersection-observer/zero-area-element-hidden.html": [
     [
      "/intersection-observer/zero-area-element-hidden.html",
@@ -385481,6 +385793,24 @@
      {}
     ]
    ],
+   "layout-stability/buffer-layout-jank.html": [
+    [
+     "/layout-stability/buffer-layout-jank.html",
+     {}
+    ]
+   ],
+   "layout-stability/observe-layoutjank.html": [
+    [
+     "/layout-stability/observe-layoutjank.html",
+     {}
+    ]
+   ],
+   "layout-stability/supported-layout-type.html": [
+    [
+     "/layout-stability/supported-layout-type.html",
+     {}
+    ]
+   ],
    "lifecycle/child-display-none.tentative.html": [
     [
      "/lifecycle/child-display-none.tentative.html",
@@ -399937,6 +400267,12 @@
      }
     ]
    ],
+   "payment-request/rejects_if_not_active_manual.https.html": [
+    [
+     "/payment-request/rejects_if_not_active_manual.https.html",
+     {}
+    ]
+   ],
    "performance-timeline/case-sensitivity.any.js": [
     [
      "/performance-timeline/case-sensitivity.any.html",
@@ -411162,7 +411498,9 @@
    "screen-orientation/lock-basic.html": [
     [
      "/screen-orientation/lock-basic.html",
-     {}
+     {
+      "testdriver": true
+     }
     ]
    ],
    "screen-orientation/lock-sandboxed-iframe.html": [
@@ -413803,6 +414141,12 @@
      {}
     ]
    ],
+   "signed-exchange/sxg-merkle-integrity-error.tentative.html": [
+    [
+     "/signed-exchange/sxg-merkle-integrity-error.tentative.html",
+     {}
+    ]
+   ],
    "signed-exchange/sxg-non-secure-origin.tentative.html": [
     [
      "/signed-exchange/sxg-non-secure-origin.tentative.html",
@@ -413815,6 +414159,12 @@
      {}
     ]
    ],
+   "signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html": [
+    [
+     "/signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html",
+     {}
+    ]
+   ],
    "signed-exchange/sxg-prefetch-resource-timing.tentative.html": [
     [
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@@ -449245,7 +449595,7 @@
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-   "0f3747500486695937d65c1ea89b6ebb49cb280b",
+   "7224ff079f6b31dea3eccf10c03d2e1aeec01ed8",
    "support"
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@@ -457172,6 +457522,14 @@
    "b02186309dc2cf8df05559ef9fb9bcacdf535112",
    "testharness"
   ],
+  "animation-worklet/animator-animate.https.html": [
+   "6efc3caf89d7fc0a933ed3366bedcaa41f19b5c9",
+   "testharness"
+  ],
+  "animation-worklet/animator-with-options.https.html": [
+   "1ff2544d6a9a4ee2cb251ef1d27b2278d979344f",
+   "testharness"
+  ],
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    "support"
@@ -460689,7 +461047,7 @@
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-   "28065eff5fc907dbfb69f4c69020d049c7daa35d",
+   "afc0a7c26e1c2aa63a54bcf39d74cf9c7adf6d75",
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@@ -480573,7 +480931,7 @@
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-   "28ca32e3dcc345fff5e187eee24e124cdbb250d4",
+   "b21273ca555cb24aab369a752192ab87355339d2",
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@@ -570800,6 +571158,10 @@
    "592e5d22e70f1b0c5e3e4b9222cbd1ccef99bdef",
    "testharness"
   ],
+  "css/css-position/position-absolute-dynamic-containing-block.html": [
+   "3968f685849663574ca213fcb90dc5fb3eaffaa3",
+   "testharness"
+  ],
   "css/css-position/position-absolute-in-inline-crash.html": [
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    "testharness"
@@ -592524,6 +592886,10 @@
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    "support"
   ],
+  "css/css-values/rgba-011.html": [
+   "84c317033063b72716e36cfd15466780e010ba11",
+   "testharness"
+  ],
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    "support"
@@ -613732,8 +614098,12 @@
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    "testharness"
   ],
+  "custom-elements/reactions/HTMLBaseElement.html": [
+   "82ab9228043053d26496c6ec106b812da5a66267",
+   "testharness"
+  ],
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-   "90390108b42155b2e5fcd5984d3a43a3ad1f9f6b",
+   "9b134ce2c6841a844b85e9fd27bc52c24fa29c91",
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@@ -613837,7 +614207,7 @@
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   ],
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-   "c7b1851c7bf2abba861f02e7aaae5fb810f8d4a9",
+   "84d039bad9fb3674e124f7f852e77b2fcdf21a28",
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@@ -615801,7 +616171,7 @@
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   ],
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-   "ab373481204e64070b8e3fd5a0f52f06211153b4",
+   "5f7e2bb0d4b459bd20acb43aca19b848920ac8bb",
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@@ -616476,6 +616846,10 @@
    "e56092c65bf4ab422875b54e25a5315d9f6da8c9",
    "testharness"
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+  "element-timing/observe-svg-image.html": [
+   "327ab69668b20addd31df5e9ae2ce655f021d81b",
+   "testharness"
+  ],
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@@ -621069,55 +621443,55 @@
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+   "688c697ac931eefb445e75240bc4cb978c088e47",
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-   "4756a79ab258ffc4402e02d80e745760c9caf9cb",
+   "bc79f7810a1be2cd12b40463ec6cac9a9e80d723",
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-   "8558d6890e6fc8afa9e948906615cfc3ea79818c",
+   "a5323921c26bc9882c0c17e75a2a562fe7d6972f",
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-   "8e05b255b88df81ae7db95428e0a5d8dd236000a",
+   "92749ae0b80c44938e6ca88e7c9bbbcd1cef48ca",
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-   "1cfa8641ba8785d9168d85b73eaa12b95b10e314",
+   "f1d8e06e50e2decdcd7f5051c50a623e5642ffa4",
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@@ -621137,7 +621511,7 @@
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   ],
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-   "1a9ec154e02ba4c6a46ee3d4fde7a866ddd330fa",
+   "4bee68996e86e7fc9736f97cbdf3a002b73ad817",
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@@ -621157,39 +621531,39 @@
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-   "d76378f1dd8df62fa5404dc1fda1b47fb6a8d409",
+   "a35e753c7898cc89427fa8dc22ce5fd55325ea8e",
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+   "3218a40abdedfbb39b0dcb7a70d1c30d59ae74a2",
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+   "5b7ee772b6175d7c2af3b1932a6194d69785ce65",
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-   "b9dfabf9739775aa77952f5d48fca57d3224b581",
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@@ -624476,6 +624850,10 @@
    "d3af35c6d7ac50de4fd8942066875d52229634f2",
    "testharness"
   ],
+  "html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html": [
+   "46280854e8f1b078e8653cfc875cfa559271407c",
+   "testharness"
+  ],
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@@ -624496,6 +624874,14 @@
    "82e8023d0ba61851af5747ee2ccba154193d1875",
    "support"
   ],
+  "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html": [
+   "61f54af3593167a0b09145f5d9755275cce98622",
+   "support"
+  ],
+  "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js": [
+   "b6631ea4f15035b61b95f2b6d6d2c2a7a16bf83b",
+   "support"
+  ],
   "html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_setter_iframe.html": [
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    "support"
@@ -624792,6 +625178,10 @@
    "653f12b4646c06ffa65f84cd2dfe72566f9662ff",
    "testharness"
   ],
+  "html/browsers/the-window-object/name-attribute.window.js": [
+   "f266dd7acb96cc473129c066e59f027c2eb067f0",
+   "testharness"
+  ],
   "html/browsers/the-window-object/named-access-on-the-window-object/named-objects.html": [
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@@ -639153,7 +639543,7 @@
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-   "83c69de301422f20241042852ac033023faf5ee0",
+   "c319266887b7ee916e80bce1eadcc033a13411bd",
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   ],
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@@ -641240,6 +641630,14 @@
    "07bccb788052e7ce2cb722558e416b5c017ed9f0",
    "testharness"
   ],
+  "html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html": [
+   "dd4c531070c8a21328a14709fd0357c6fba15001",
+   "testharness"
+  ],
+  "html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html": [
+   "5f0dba6bcf72cb94f7e53ee52bfaedf7ac4819bf",
+   "testharness"
+  ],
   "html/webappapis/system-state-and-capabilities/the-navigator-object/navigatorcookies-cookieenabled-false-manual.html": [
    "adcea90a363af504c33738da53a979b9bd9479e7",
    "manual"
@@ -641560,6 +641958,134 @@
    "2bb82c9834790bfeb1a65cf2ef202dc63d2ebac4",
    "support"
   ],
+  "import-maps/@std/__dir__.headers": [
+   "e7ec0d6699d07e5b13d0cb6f24c3639258fccdaa",
+   "support"
+  ],
+  "import-maps/@std/blank": [
+   "38e1891bf7d5db9ad7063dc1f22bb17f8b1d4446",
+   "support"
+  ],
+  "import-maps/@std/none": [
+   "69e165cce5e223684c9d0f0f7848bc6fc02b14cd",
+   "support"
+  ],
+  "import-maps/README.md": [
+   "3803e350c844b4af77b871831817ac0d90aca97f",
+   "support"
+  ],
+  "import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html": [
+   "512cd7fa6974e802dab6bff4c190774a76d7cbf1",
+   "testharness"
+  ],
+  "import-maps/acquire-import-maps-flag/script-tag/success.tentative.html": [
+   "7f319b04758f8dbfd688f10b6a86be16d6bb720f",
+   "testharness"
+  ],
+  "import-maps/acquire-import-maps-flag/worker-request/success.tentative.html": [
+   "ceef4100aad01f5cd5959086aacf83665f60c805",
+   "testharness"
+  ],
+  "import-maps/bare.sub.tentative.html": [
+   "5bfb6b52072338568397a8dfac3a98a90c70b34b",
+   "testharness"
+  ],
+  "import-maps/bare/__dir__.headers": [
+   "e7ec0d6699d07e5b13d0cb6f24c3639258fccdaa",
+   "support"
+  ],
+  "import-maps/bare/bare": [
+   "1011e866b81dca7bf423fcb48266463c77591465",
+   "support"
+  ],
+  "import-maps/bare/blank": [
+   "841d433acf72f828c34faca23f26e9afd10fbab7",
+   "support"
+  ],
+  "import-maps/bare/cross-origin-bare": [
+   "64851cc8e2455a4cd150b10edf051425bb6dc5bf",
+   "support"
+  ],
+  "import-maps/bare/none": [
+   "2aec0d72826f203074dea5a5268b9f937bdb7183",
+   "support"
+  ],
+  "import-maps/bare/std-blank": [
+   "5ded98fd382a52a11d52af57cc7e79f56b083843",
+   "support"
+  ],
+  "import-maps/bare/std-none": [
+   "1437d9ff1e0c0c60672a1f656a2ab91aa01601db",
+   "support"
+  ],
+  "import-maps/bare/to-bare": [
+   "bdb3791bc9471533434067b826dc59fef07e1c0c",
+   "support"
+  ],
+  "import-maps/bare/to-data": [
+   "6f25c5af12412dc6dbb374d4bee0fdd1472f475e",
+   "support"
+  ],
+  "import-maps/builtin-empty.tentative.html": [
+   "aba28d18e043d53271888a382a7f7b4ca89a054a",
+   "testharness"
+  ],
+  "import-maps/builtin-import-scheme.tentative.html": [
+   "6a27ef5aee2371b2114bc75b2b194c22a5fa85c2",
+   "testharness"
+  ],
+  "import-maps/builtin.tentative.html": [
+   "e85289e4d884d49bb4520154cecdd2826a07b333",
+   "testharness"
+  ],
+  "import-maps/data.sub.tentative.html": [
+   "1c7172bf7c6f21aeb22948f9d3eb05d9b3c11b86",
+   "testharness"
+  ],
+  "import-maps/fallback-disallowed.sub.tentative.html": [
+   "3f89e8f12dfe04b214b36ef89a89eeccdbea935b",
+   "testharness"
+  ],
+  "import-maps/fallback.sub.tentative.html": [
+   "4cf3e18182a11a75d682106d88c532d069b6e77d",
+   "testharness"
+  ],
+  "import-maps/http.sub.tentative.html": [
+   "bd24f3535507334a69bb98b711106466c8a340a3",
+   "testharness"
+  ],
+  "import-maps/module-map-key.tentative.html": [
+   "13bd122c673144f001048eacbaf4fc7bb78c9b58",
+   "testharness"
+  ],
+  "import-maps/resolving.tentative.html": [
+   "f2b09a7ae02422c8f6fd3f8dad1f9b8d52a43831",
+   "testharness"
+  ],
+  "import-maps/resources/empty.js": [
+   "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+   "support"
+  ],
+  "import-maps/resources/log.js": [
+   "a024a29bf2482c78cf7eb96544d38217f1d81f81",
+   "support"
+  ],
+  "import-maps/resources/log.js.headers": [
+   "cb762eff806849df46dc758ef7b98b63f27f54c9",
+   "support"
+  ],
+  "import-maps/resources/resolving.js": [
+   "ec2645e599119ab64949c016076164b40277006c",
+   "support"
+  ],
+  "import-maps/resources/test-helper.js": [
+   "2447bfb94353e1ec193857cbcda79f46556216a1",
+   "support"
+  ],
+  "import-maps/static-import.js": [
+   "1686fc123a798bddbf626f4d112516317739da8f",
+   "support"
+  ],
   "inert/inert-does-not-match-disabled-selector.tentative.html": [
    "74b8ac3f7dd5c3447bf47fd732fade9220497c93",
    "testharness"
@@ -642569,7 +643095,7 @@
    "support"
   ],
   "interfaces/webxr.idl": [
-   "2bc100e100d89da510c56dc51d13d45335f67740",
+   "d175729ca20fd66b0d1d8a32ef32e0957c58548f",
    "support"
   ],
   "interfaces/worklets.idl": [
@@ -642673,7 +643199,7 @@
    "support"
   ],
   "intersection-observer/resources/intersection-observer-test-utils.js": [
-   "8683c8b570c8bffbe413315c2b36ec1e47a6d650",
+   "44f794b0883b1bade51b1b7b8f5507ac6dfcb123",
    "support"
   ],
   "intersection-observer/resources/observer-in-iframe-subframe.html": [
@@ -642684,6 +643210,10 @@
    "143e4f6e23a7688949420a07ccd20e3c211a6f6b",
    "support"
   ],
+  "intersection-observer/resources/v2-subframe.html": [
+   "295bbf047e6523313ce74f2e383ed769c0d5c81b",
+   "support"
+  ],
   "intersection-observer/root-margin.html": [
    "c1fffec02becc50ccaad1f8fdaa9ffd16afef11c",
    "testharness"
@@ -642720,6 +643250,50 @@
    "24ae01cedc2ef95f6dd04a722d47aefa30e8b777",
    "testharness"
   ],
+  "intersection-observer/v2/animated-occlusion.html": [
+   "c1eafb7fa1427a507c203feac5e0685a39bcb5e4",
+   "testharness"
+  ],
+  "intersection-observer/v2/blur-filter.html": [
+   "2f55066e3630f73f53bbab050cfab236c7cd60d7",
+   "testharness"
+  ],
+  "intersection-observer/v2/box-shadow.html": [
+   "bcc6980aec3641db0573c8b081632b53880a423e",
+   "testharness"
+  ],
+  "intersection-observer/v2/cross-origin-effects.sub.html": [
+   "edb8f023c09ff51ef6693dd6b994c364895241ca",
+   "testharness"
+  ],
+  "intersection-observer/v2/cross-origin-occlusion.sub.html": [
+   "6f9fa57fb718ceb90870fd0812930eda79db7d1b",
+   "testharness"
+  ],
+  "intersection-observer/v2/delay-test.html": [
+   "086301c44d4ef5f5dce2afb1d9ff6388f089fccf",
+   "testharness"
+  ],
+  "intersection-observer/v2/iframe-target.html": [
+   "3e53ee5f5814e8ef69d8454011ceafabfe8d1f17",
+   "testharness"
+  ],
+  "intersection-observer/v2/simple-effects.html": [
+   "2b7a83a9c9507a79e91cb2ef890604d9b2ca5e3e",
+   "testharness"
+  ],
+  "intersection-observer/v2/simple-occlusion-svg-foreign-object.html": [
+   "fcdff67a48925a74a200e328eaf4bcd6deefb9ae",
+   "testharness"
+  ],
+  "intersection-observer/v2/simple-occlusion.html": [
+   "ea1ee31ebe4519f9563987934c1a9db7fac77136",
+   "testharness"
+  ],
+  "intersection-observer/v2/text-shadow.html": [
+   "c6445c514eecaf978e95d75f5d37a1387939c5e2",
+   "testharness"
+  ],
   "intersection-observer/zero-area-element-hidden.html": [
    "e007040c8fe2e25bfca8fbe450b06a26934ad186",
    "testharness"
@@ -642932,6 +643506,22 @@
    "64756bf195fc3319d9dd21abad4c5d86fa266cfe",
    "testharness"
   ],
+  "layout-stability/buffer-layout-jank.html": [
+   "f5818cfbc64e0dc70d503d79a278f20777151280",
+   "testharness"
+  ],
+  "layout-stability/observe-layoutjank.html": [
+   "1a0533ac703e92abbd3d2116b9d3eedaff6278ce",
+   "testharness"
+  ],
+  "layout-stability/resources/slow-image.py": [
+   "ee7988c551f6429eea2b929af083ad30cbd5c73d",
+   "support"
+  ],
+  "layout-stability/supported-layout-type.html": [
+   "e3204b52f788729e6a9b1ee845ea36ff79a8b8cf",
+   "testharness"
+  ],
   "lifecycle/META.yml": [
    "c1fcbca4c1f8366da1dd9eb91bc9427edeef1153",
    "support"
@@ -642957,7 +643547,7 @@
    "support"
   ],
   "lint.whitelist": [
-   "64ff0296a46f3f8302dd71a9894144c6988e24b0",
+   "0d066ac741feb9732ca48f84c208e62fc141132c",
    "support"
   ],
   "loading/preloader-css-import-no-quote.tentative.html": [
@@ -654545,7 +655135,7 @@
    "support"
   ],
   "payment-method-basic-card/empty-data-manual.https.html": [
-   "2392553ebd3742daac77bf3a80259627a6e44c20",
+   "ba881ee2366c49aa15799767892c5ed847e41ac3",
    "manual"
   ],
   "payment-method-basic-card/historical.https.html": [
@@ -654557,7 +655147,7 @@
    "testharness"
   ],
   "payment-method-basic-card/payment-request-canmakepayment-method.https.html": [
-   "a89c63b1bbc8aa3a917207a129d56827be31b617",
+   "f1b0c28abb886745713378025af341507a3a7c2d",
    "testharness"
   ],
   "payment-method-id/META.yml": [
@@ -654573,7 +655163,7 @@
    "testharness"
   ],
   "payment-request/META.yml": [
-   "227ca551dc2f564bf8af8f8eae63526f4f86d8b8",
+   "558db3e088c1b07ad90eff717feccbb0591e67fb",
    "support"
   ],
   "payment-request/MerchantValidationEvent/complete-method.https.html": [
@@ -654736,24 +655326,16 @@
    "650b76d61f72d82fce1644be95e1ee2b99a90d95",
    "testharness"
   ],
-  "payment-request/payment-request-abort-method-manual.https.html": [
-   "a24bac864aad00afdfe830e04b40ef81a583b341",
-   "manual"
-  ],
   "payment-request/payment-request-abort-method.https.html": [
-   "cf16401d0b0d3e97f3ab14c337880a4ec0d9ea7f",
+   "a8a013165ee2573571e606a70565b2014e44c5aa",
    "testharness"
   ],
-  "payment-request/payment-request-canmakepayment-method-manual.https.html": [
-   "fea45500b18b35eadf144389e86d444d53366fce",
-   "manual"
-  ],
   "payment-request/payment-request-canmakepayment-method-protection.https.html": [
    "e221034dd4ebd05c5bd701e05a81895b8457c3b7",
    "testharness"
   ],
   "payment-request/payment-request-canmakepayment-method.https.html": [
-   "cc8349a42239ca1a459d59f016611f6e564f4690",
+   "5627f337488b83a326bcf39d28dd992b78873eaf",
    "testharness"
   ],
   "payment-request/payment-request-constructor-crash.https.html": [
@@ -654773,7 +655355,7 @@
    "testharness"
   ],
   "payment-request/payment-request-hasenrolledinstrument-method-manual.https.html": [
-   "a4e8028c07f50514b03a7f10b80e1b3ba80bc505",
+   "e6b164f7cc7b8f1c57b8fa9fd14cbc7f5ef81eea",
    "manual"
   ],
   "payment-request/payment-request-hasenrolledinstrument-method-protection.https.html": [
@@ -654781,7 +655363,7 @@
    "testharness"
   ],
   "payment-request/payment-request-hasenrolledinstrument-method.https.html": [
-   "c5139950d53ec310b3ed5cb835d4d252033f904f",
+   "c1f7b27a22b41fe64a7fb77e73336d3d0daec159",
    "testharness"
   ],
   "payment-request/payment-request-id-attribute.https.html": [
@@ -654881,7 +655463,11 @@
    "manual"
   ],
   "payment-request/rejects_if_not_active.https.html": [
-   "06c1f7383a045d7ffd386cb6aec57d6010843d31",
+   "3c7e85ba970f8c6f2d608f02dd2f60f911124da2",
+   "testharness"
+  ],
+  "payment-request/rejects_if_not_active_manual.https.html": [
+   "f1d2fb83e0e0b17e0030bc991b0135bd21200aa0",
    "testharness"
   ],
   "payment-request/resources/page1.html": [
@@ -655029,7 +655615,7 @@
    "support"
   ],
   "picture-in-picture/disable-picture-in-picture.html": [
-   "31e0d12ad770fb9bcc8bbc2f7f86d690efe3c06d",
+   "5075c011632e549848dfbd3420d733d60e84dc8a",
    "testharness"
   ],
   "picture-in-picture/enter-picture-in-picture.html": [
@@ -667081,7 +667667,7 @@
    "testharness"
   ],
   "screen-orientation/lock-basic.html": [
-   "5b30459bf7fab739c34dd0723e60e9ab46c5a9ea",
+   "c42aba783e4c0a593a3c71c14ea4ea792953a5dc",
    "testharness"
   ],
   "screen-orientation/lock-sandboxed-iframe.html": [
@@ -667093,7 +667679,7 @@
    "testharness"
   ],
   "screen-orientation/onchange-event.html": [
-   "538fafc41ec317288b58b85cfa17c8ff3c705f08",
+   "401af096631a2cfdf44f3c920454eb1958925c3c",
    "testharness"
   ],
   "screen-orientation/orientation-reading.html": [
@@ -669137,7 +669723,7 @@
    "testharness"
   ],
   "service-workers/service-worker/postmessage-to-client-message-queue.https.html": [
-   "caa4f9445d3d8ad0ab92ba73713da17a33af185c",
+   "83e5f4540d1411e2a215ebe59d2037f369c48616",
    "testharness"
   ],
   "service-workers/service-worker/postmessage-to-client.https.html": [
@@ -671373,7 +671959,7 @@
    "support"
   ],
   "signed-exchange/resources/generate-test-sxgs.sh": [
-   "7c953940cb308b669a647a4a2d5c5bbc83c60200",
+   "bb95df83295e1b2f81a569e93fd5d9d0ce548574",
    "support"
   ],
   "signed-exchange/resources/inner-url.html": [
@@ -671440,6 +672026,10 @@
    "1678b751bcba390d35687730bb24e13232e33eda",
    "support"
   ],
+  "signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg": [
+   "0c6dce01da270bdacf5d280551d56d1519aff3a3",
+   "support"
+  ],
   "signed-exchange/resources/sxg/sxg-noncacheable.sxg": [
    "88439982f6044b3ddbd1a1e0198bebb6409b0837",
    "support"
@@ -671488,6 +672078,10 @@
    "17ca0768d6f8e0e1a4bccf707d8e34c6dbfdfc8c",
    "testharness"
   ],
+  "signed-exchange/sxg-merkle-integrity-error.tentative.html": [
+   "5f923d205421ca30e360ddf0de41bb64733de1d3",
+   "testharness"
+  ],
   "signed-exchange/sxg-non-secure-origin.tentative.html": [
    "84938da76d09dbe4f045b763e49ba95a4936003f",
    "testharness"
@@ -671496,6 +672090,10 @@
    "1315360745789655acb926d7e8bafea9322c3a25",
    "testharness"
   ],
+  "signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html": [
+   "2086c38545d7df43dbe913b78ef1030c476b3649",
+   "testharness"
+  ],
   "signed-exchange/sxg-prefetch-resource-timing.tentative.html": [
    "5b60ab9e1a12e2b169c4972c422ddbe3ebc5f581",
    "testharness"
@@ -680849,7 +681447,7 @@
    "support"
   ],
   "tools/wpt/browser.py": [
-   "5f711f47580fc54461c166771b28828693a63d5b",
+   "c4469800608ad73b4a00c3bbef558cf9d0f7e596",
    "support"
   ],
   "tools/wpt/commands.json": [
@@ -681241,7 +681839,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/executormarionette.py": [
-   "1b4c0b93cbeb9d303f5e7df89ccc68f592c30c27",
+   "5791cdae957b54031186cca0ec1359f12e08b1ce",
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/executoropera.py": [
@@ -681277,7 +681875,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/protocol.py": [
-   "74a7cc4b7fc686318b9944272dc4118ae3cb95e4",
+   "aa3565e5726a0662d10ed49cee85f153691c441f",
    "support"
   ],
   "tools/wptrunner/wptrunner/executors/pytestrunner/__init__.py": [
@@ -681377,7 +681975,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/testrunner.py": [
-   "d3a62646278e38fcb0c86bc163c4595560f5fa3f",
+   "05b3190a5f44ec83311c8df9e72fadea46594b95",
    "support"
   ],
   "tools/wptrunner/wptrunner/tests/__init__.py": [
diff --git a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
index e1a609649d6..ee754ce4aa3 100644
--- a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
@@ -3,3 +3,9 @@
   [scroll-behavior: smooth on DIV element]
     expected: FAIL
 
+  [Smooth scrolling while doing history navigation.]
+    expected: FAIL
+
+  [Instant scrolling while doing history navigation.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/reactions/HTMLBaseElement.html.ini b/tests/wpt/metadata/custom-elements/reactions/HTMLBaseElement.html.ini
new file mode 100644
index 00000000000..33970e18200
--- /dev/null
+++ b/tests/wpt/metadata/custom-elements/reactions/HTMLBaseElement.html.ini
@@ -0,0 +1,7 @@
+[HTMLBaseElement.html]
+  [target on HTMLBaseElement must enqueue an attributeChanged reaction when adding a new attribute]
+    expected: FAIL
+
+  [target on HTMLBaseElement must enqueue an attributeChanged reaction when replacing an existing attribute]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini b/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
index 10057a087f4..bc0535d9712 100644
--- a/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
+++ b/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
@@ -27,3 +27,24 @@
   [Check if attribute serialization takes into account of the same prefix declared in an ancestor element]
     expected: FAIL
 
+  [Check if the prefix of an attribute is replaced with another existing prefix mapped to the same namespace URI.]
+    expected: FAIL
+
+  [Check if inconsistent xmlns="..." is dropped.]
+    expected: FAIL
+
+  [Check if an attribute with namespace and no prefix is serialized with the nearest-declared prefix]
+    expected: FAIL
+
+  [Check if no special handling for XLink namespace unlike HTML serializer.]
+    expected: FAIL
+
+  [Check if the prefix of an attribute is NOT preserved in a case where neither its prefix nor its namespace URI is not already used.]
+    expected: FAIL
+
+  [Check if the prefix of an attribute is replaced with a generated one in a case where the prefix is already mapped to a different namespace URI.]
+    expected: FAIL
+
+  [Check if an attribute with namespace and no prefix is serialized with the nearest-declared prefix even if the prefix is assigned to another namespace.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/fetch.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/fetch.tentative.https.sub.html.ini
index 3a72c7d6b84..70f3a453c27 100644
--- a/tests/wpt/metadata/fetch/sec-metadata/fetch.tentative.https.sub.html.ini
+++ b/tests/wpt/metadata/fetch/sec-metadata/fetch.tentative.https.sub.html.ini
@@ -8,3 +8,12 @@
   [Cross-site fetch]
     expected: FAIL
 
+  [Same-origin mode]
+    expected: FAIL
+
+  [no-CORS mode]
+    expected: FAIL
+
+  [CORS mode]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/script.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/script.tentative.https.sub.html.ini
index ecf13666b3d..eb77e8c6c3d 100644
--- a/tests/wpt/metadata/fetch/sec-metadata/script.tentative.https.sub.html.ini
+++ b/tests/wpt/metadata/fetch/sec-metadata/script.tentative.https.sub.html.ini
@@ -8,3 +8,6 @@
   [Cross-site script]
     expected: FAIL
 
+  [Same-origin CORS script]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/style.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/style.tentative.https.sub.html.ini
index 660d71dcc7f..6054adf0361 100644
--- a/tests/wpt/metadata/fetch/sec-metadata/style.tentative.https.sub.html.ini
+++ b/tests/wpt/metadata/fetch/sec-metadata/style.tentative.https.sub.html.ini
@@ -8,3 +8,6 @@
   [Same-Origin style]
     expected: FAIL
 
+  [Same-Origin, cors style]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/track.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/track.tentative.https.sub.html.ini
index 15eaec3e714..3e1fe1a05a2 100644
--- a/tests/wpt/metadata/fetch/sec-metadata/track.tentative.https.sub.html.ini
+++ b/tests/wpt/metadata/fetch/sec-metadata/track.tentative.https.sub.html.ini
@@ -9,3 +9,6 @@
   [Cross-Site track]
     expected: NOTRUN
 
+  [Same-Origin, CORS track]
+    expected: NOTRUN
+
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
deleted file mode 100644
index 78879bad5f1..00000000000
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[javascript-url-abort-return-value-undefined.tentative.html]
-  expected: TIMEOUT
-  [Not aborting fetch for javascript:undefined navigation]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index dc2e45516de..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini b/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
new file mode 100644
index 00000000000..b1497a0359f
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
@@ -0,0 +1,31 @@
+[document_domain_access_details.sub.html]
+  [Access allowed if same-origin with no 'document.domain' modification. (Sanity check)]
+    expected: FAIL
+
+  [Access is revoked to Window object when we stop being same effective script origin due to document.domain.]
+    expected: FAIL
+
+  [Access allowed if different-origin but both set document.domain to parent domain.]
+    expected: FAIL
+
+  [Access is not revoked to random object when we stop being same effective script origin due to document.domain.]
+    expected: FAIL
+
+  [Access not allowed if different-origin with no 'document.domain' modification. (Sanity check)]
+    expected: FAIL
+
+  [Access disallowed again if same-origin, both set document-domain to existing value, then one sets to parent.]
+    expected: FAIL
+
+  [Access is revoked to Location object when we stop being same effective script origin due to document.domain.]
+    expected: FAIL
+
+  [Access allowed if same-origin and both set document.domain to existing value.]
+    expected: FAIL
+
+  [Access is not revoked to Document object when we stop being same effective script origin due to document.domain.]
+    expected: FAIL
+
+  [Access disallowed if same-origin but only one sets document.domain.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/name-attribute.window.js.ini b/tests/wpt/metadata/html/browsers/the-window-object/name-attribute.window.js.ini
new file mode 100644
index 00000000000..015d05d87e1
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/the-window-object/name-attribute.window.js.ini
@@ -0,0 +1,4 @@
+[name-attribute.window.html]
+  [Window object's name IDL attribute]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
deleted file mode 100644
index 6cf9d13975c..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[iframe_005.html]
-  [document.write external script into iframe write back into parent]
-    expected: FAIL
-
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index 0f374750048..7224ff079f6 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -214,15 +214,11 @@ jobs:
 - job: all_post
   displayName: 'all tests (wpt.fyi hook)'
   dependsOn: all_macOS
-  pool: server
+  pool:
+    vmImage: 'ubuntu-16.04'
   steps:
-  - task: InvokeRESTAPI@1
+  - script: curl -s -S https://wpt.fyi/api/checks/azure/$(Build.BuildId)
     displayName: 'Invoke wpt.fyi hook'
-    inputs:
-      serviceConnection: wpt.fyi
-      urlSuffix: /api/checks/azure/$(Build.BuildId)
-  - task: InvokeRESTAPI@1
+  - script: curl -s -S https://staging.wpt.fyi/api/checks/azure/$(Build.BuildId)
     displayName: 'Invoke staging.wpt.fyi hook'
-    inputs:
-      serviceConnection: staging.wpt.fyi
-      urlSuffix: /api/checks/azure/$(Build.BuildId)
+    condition: succeededOrFailed()
diff --git a/tests/wpt/web-platform-tests/animation-worklet/animator-animate.https.html b/tests/wpt/web-platform-tests/animation-worklet/animator-animate.https.html
new file mode 100644
index 00000000000..6efc3caf89d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/animator-animate.https.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Basic use of Worklet Animation</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="common.js"></script>
+
+<div id="target"></div>
+
+<script>
+  promise_test(async t => {
+    await registerConstantLocalTimeAnimator(500);
+    const effect = new KeyframeEffect(target, [{ opacity: 0 }], { duration: 1000 });
+    const animation = new WorkletAnimation('constant_time', effect);
+    animation.play();
+
+    await waitForAsyncAnimationFrames(1);
+    assert_equals(getComputedStyle(target).opacity, "0.5");
+  }, "Simple worklet animation should output values at specified local time");
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/animation-worklet/animator-with-options.https.html b/tests/wpt/web-platform-tests/animation-worklet/animator-with-options.https.html
new file mode 100644
index 00000000000..1ff2544d6a9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/animator-with-options.https.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>Worklet Animation with options</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="common.js"></script>
+
+<div id="target"></div>
+
+<script id="animate_with_options" type="text/worklet">
+  registerAnimator("test_animator", class {
+    constructor(options) {
+      this.time_ = options.time;
+    }
+    animate(currentTime, effect) {
+      effect.localTime = this.time_;
+    }
+  });
+</script>
+
+<script>
+  promise_test(async t => {
+    await runInAnimationWorklet(document.getElementById('animate_with_options').textContent);
+    const target = document.getElementById('target');
+    const effect = new KeyframeEffect(target, [{ opacity: 0 }], { duration: 1000 });
+    const options = {'time': 500};
+    const animation = new WorkletAnimation('test_animator', effect, document.timeline, options);
+    animation.play();
+
+    await waitForAsyncAnimationFrames(1);
+    assert_equals(getComputedStyle(target).opacity, "0.5");
+  }, "Animator should be able to use options to update the animation");
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/common/sleep.py b/tests/wpt/web-platform-tests/common/sleep.py
index 28065eff5fc..afc0a7c26e1 100644
--- a/tests/wpt/web-platform-tests/common/sleep.py
+++ b/tests/wpt/web-platform-tests/common/sleep.py
@@ -5,4 +5,8 @@ import time
 sleep_padding = 15.0
 
 def sleep_at_least(sleep_in_ms):
-    time.sleep((sleep_in_ms + sleep_padding) / 1E3);
+    sleep_until = time.time() + (sleep_in_ms / 1E3)
+    time.sleep((sleep_in_ms + sleep_padding) / 1E3)
+    # Check if the padding was sufficient; if not, sleep again.
+    while time.time() < sleep_until:
+        time.sleep(sleep_padding / 1E3)
diff --git a/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/targeting.html b/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/targeting.html
index 28ca32e3dcc..b21273ca555 100644
--- a/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/targeting.html
+++ b/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/targeting.html
@@ -36,7 +36,7 @@
             .then(t.step_func(e => {
                 assert_equals(e.blockedURI, "inline");
                 assert_equals(e.lineNumber, 118);
-                assert_equals(e.columnNumber, 4);
+                assert_in_array(e.columnNumber, [4, 6]);
                 assert_equals(e.target, document, "Elements created in this document, but pushed into a same-origin frame trigger on that frame's document, not on this frame's document.");
                 return watcher.wait_for('securitypolicyviolation');
             }))
@@ -50,7 +50,7 @@
             .then(t.step_func(e => {
                 assert_equals(e.blockedURI, "inline");
                 assert_equals(e.lineNumber, 139);
-                assert_equals(e.columnNumber, 4);
+                assert_in_array(e.columnNumber, [4, 6]);
                 assert_equals(e.target, document, "Inline event handlers for disconnected elements target the document.");
                 return watcher.wait_for('securitypolicyviolation');
             }))
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-absolute-dynamic-containing-block.html b/tests/wpt/web-platform-tests/css/css-position/position-absolute-dynamic-containing-block.html
new file mode 100644
index 00000000000..3968f685849
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-position/position-absolute-dynamic-containing-block.html
@@ -0,0 +1,140 @@
+<!DOCTYPE html>
+<title>CSS Position: position:absolute dynamic containing block</title>
+<link rel="author" title="mailto:atotic@google.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/css-position-3/#def-cb">
+<meta name="assert" content="Tests changes in containing block for out-of-flow positioned descendants.">
+<style>
+
+#outer {
+  width: 400px;
+  height: 300px;
+  outline: black solid 1px;
+}
+#intermediate {
+  width: 300px;
+  height: 200px;
+  outline: gray solid 1px;
+}
+#target {
+  background: green;
+}
+.abs {
+  position: absolute;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+}
+.fixed {
+  position: fixed;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+}
+.abs-container {
+  position: relative;
+}
+.fixed-container {
+  will-change: transform;
+}
+div {
+  padding: 5px;
+}
+</style>
+<!-- This tests potential caching of out-of-flow positioned descendants. -->
+<div id="outer">
+  <div>
+    <div id="intermediate">
+      <div>
+        <div id="target">TTT</div>
+        <div id="noLayout1"></div>
+      </div>
+      <div id="noLayout2"></div>
+    </div>
+  </div>
+</div>
+<script>
+  let outer = document.querySelector("#outer");
+  let intermediate = document.querySelector("#intermediate");
+  let target = document.querySelector("#target");
+  let padding = 5;
+
+  function cleanup() {
+    outer.className = "";
+    intermediate.className = "";
+    target.className = "";
+    document.body.offsetTop;
+  }
+
+  test( t => {
+    t.add_cleanup(cleanup);
+    outer.classList.add("abs-container");
+    target.classList.add("abs");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+    intermediate.classList.add("abs-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+  }, "abs containing block moves from outer to intermediate" );
+  test( t => {
+    t.add_cleanup(cleanup);
+    target.classList.add("abs");
+    intermediate.classList.add("abs-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+    outer.classList.add("abs-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+    intermediate.classList.remove("abs-container");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+  }, "abs containing block moves from intermediate to outer" );
+  test( t => {
+    t.add_cleanup(cleanup);
+    target.classList.add("abs");
+    outer.classList.add("abs-container");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+    target.classList.remove("abs");
+    assert_equals(target.offsetWidth, intermediate.offsetWidth - 4 * padding);
+  }, "target is no longer absolute");
+  test( t => {
+    t.add_cleanup(cleanup);
+    outer.classList.add("abs-container");
+    assert_equals(target.offsetWidth, intermediate.offsetWidth - 4 * padding);
+    target.classList.add("abs");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+  }, "target becomes absolute");
+
+ // Repeat same tests with fixed
+  test( t => {
+    t.add_cleanup(cleanup);
+    outer.classList.add("fixed-container");
+    target.classList.add("fixed");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+    intermediate.classList.add("fixed-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+  }, "fixed containing block moves from outer to intermediate" );
+  test( t => {
+    t.add_cleanup(cleanup);
+    target.classList.add("fixed");
+    intermediate.classList.add("fixed-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+    outer.classList.add("fixed-container");
+    assert_equals(target.offsetHeight, intermediate.offsetHeight);
+    intermediate.classList.remove("fixed-container");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+  }, "fixed containing block moves from intermediate to outer" );
+  test( t => {
+    t.add_cleanup(cleanup);
+    target.classList.add("fixed");
+    outer.classList.add("fixed-container");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+    target.classList.remove("fixed");
+    assert_equals(target.offsetWidth, intermediate.offsetWidth - 4 * padding);
+  }, "target is no longer fixed");
+  test( t => {
+    t.add_cleanup(cleanup);
+    outer.classList.add("fixed-container");
+    assert_equals(target.offsetWidth, intermediate.offsetWidth - 4 * padding);
+    target.classList.add("fixed");
+    assert_equals(target.offsetHeight, outer.offsetHeight);
+  }, "target becomes fixed");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-values/rgba-011.html b/tests/wpt/web-platform-tests/css/css-values/rgba-011.html
new file mode 100644
index 00000000000..84c31703306
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-values/rgba-011.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Values and Units Test: rgba() function syntax (complex)</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="help" href="https://www.w3.org/TR/css-color-3/#rgba-color">
+  <link rel="help" href="https://www.w3.org/TR/css-color-4/#rgb-functions">
+  <link rel="help" href="https://www.w3.org/TR/css-values-4/#combine-integers">
+
+  <meta name="flags" content="">
+  <meta name="assert" content="This test checks the syntax allowed by rgba() function. White space characters, instead of commas, are allowed between numerical values. <alpha-value> can be omitted for rgba() function, in which case it must defaults to 100%. Finally, rgba() function can take real numbers but their computed values will be rounded to the nearest integer, with values halfway between adjacent integers rounded towards positive infinity.">
+
+  <script src="/resources/testharness.js"></script>
+
+  <script src="/resources/testharnessreport.js"></script>
+
+  <div id="log"></div>
+
+  <div id="target"></div>
+
+  <script>
+  function startTesting()
+  {
+
+    var targetElement = document.getElementById("target");
+
+    function compareValue(property_name, calcValue, expectedValue, description)
+    {
+
+    test(function()
+      {
+
+      targetElement.style.setProperty(property_name, calcValue);
+
+      var computedCalcValue = getComputedStyle(targetElement)[property_name];
+
+      targetElement.style.setProperty(property_name, expectedValue);
+
+      var computedExpectedValue = getComputedStyle(targetElement)[property_name];
+
+      assert_equals(computedCalcValue, computedExpectedValue);
+
+      }, description);
+    }
+
+    compareValue("background-color", "rgba(0.4 127.5 0.3)", "rgb(0, 128, 0)", "testing background-color: rgba(0.4 127.5 0.3)");
+
+  }
+
+  startTesting();
+
+  </script>
diff --git a/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLBaseElement.html b/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLBaseElement.html
new file mode 100644
index 00000000000..82ab9228043
--- /dev/null
+++ b/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLBaseElement.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<head>
+<title>Custom Elements: CEReactions on HTMLBaseElement interface</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<meta name="assert" content="href, target of HTMLBaseElement interface must have CEReactions">
+<meta name="help" content="https://html.spec.whatwg.org/#the-base-element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/custom-elements-helpers.js"></script>
+<script src="./resources/reactions.js"></script>
+</head>
+<script>
+
+function getParentElement() {
+  return document.head;
+}
+
+testReflectAttributeWithParentNode('href', 'href', '/', 'http://example.com/', 'href on HTMLBaseElement', 'base', getParentElement, HTMLBaseElement);
+testReflectAttributeWithParentNode('target', 'target', '_blank', '_self', 'target on HTMLBaseElement', 'base', getParentElement, HTMLBaseElement);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLButtonElement.html b/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLButtonElement.html
index 90390108b42..9b134ce2c68 100644
--- a/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLButtonElement.html
+++ b/tests/wpt/web-platform-tests/custom-elements/reactions/HTMLButtonElement.html
@@ -10,55 +10,23 @@
 <body>
 <script>
 
+function getParentElement(parentElementName) {
+  let parentElement = document.createElement(parentElementName);
+  document.body.appendChild(parentElement);
+  return parentElement;
+}
+
 testReflectAttributeWithContentValues('autofocus', 'autofocus', true, 'true', false, 'false', 'autofocus on HTMLButtonElement', 'button', HTMLButtonElement);
 testReflectAttributeWithContentValues('disabled', 'disabled', true, 'true', false, 'false', 'disabled on HTMLButtonElement', 'button', HTMLButtonElement);
 testReflectAttribute('name', 'name', 'intel', 'intel1', 'name on HTMLButtonElement', 'button', HTMLButtonElement);
 testReflectAttribute('value', 'value', 'HTML', 'CSS', 'value on HTMLButtonElement', 'button', HTMLButtonElement);
-testReflectAttrWithParentNode('type', 'type', 'submit', 'submit', 'reset', 'reset', 'type on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
+testReflectAttributeWithParentNode('type', 'type', 'submit', 'reset', 'type on HTMLButtonElement', 'button', () => getParentElement('form'), HTMLButtonElement);
 testReflectAttrWithDepAttr('formAction', 'formaction', 'type', 'intel.asp', 'intel1.asp', 'submit', 'formAction on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
 testReflectAttrWithDepAttr('formEnctype', 'formenctype', 'type', 'text/plain', 'multipart/form-data', 'submit', 'formEnctype on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
 testReflectAttrWithDepAttr('formMethod', 'formmethod', 'type', 'get', 'post', 'submit', 'formMethod on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
 testReflectAttrWithContentValuesAndDepAttr('formNoValidate', 'formnovalidate', 'type', true, 'true', false, 'false', 'submit', 'formNoValidate on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
 testReflectAttrWithDepAttr('formTarget', 'formtarget', 'type', '_blank', '_self', 'submit', 'formTarget on HTMLButtonElement', 'button', 'form', HTMLButtonElement);
 
-//In parent node, sub node's observeAttribute can enqueue by changing attribute value 
-//Test reflect attribute with content values and parent node
-function testReflectAttrWithParentNode(jsAtName, coAtName, jsAtValue1, coAtValue1, jsAtValue2, coAtValue2, name, elementName, pElementName, interfaceName) {
-    var parentElement = document.createElement(pElementName);
-    document.body.appendChild(parentElement);
-
-    test(() => {
-        var element = define_build_in_custom_element([coAtName], interfaceName, elementName);
-        var instance = document.createElement(elementName, { is: element.name });
-
-        assert_array_equals(element.takeLog().types(), ['constructed']);
-        parentElement.appendChild(instance);
-        assert_array_equals(element.takeLog().types(), ['connected']);
-        instance[jsAtName] = jsAtValue1;
-        var logEntries = element.takeLog();
-        assert_array_equals(logEntries.types(), ['attributeChanged']);
-        assert_attribute_log_entry(logEntries.last(), { name: coAtName, oldValue: null, newValue: coAtValue1, namespace: null });
-
-    }, name + ' must enqueue an attributeChanged reaction when adding a new attribute');
-
-    test(() => {
-        var element = define_build_in_custom_element([coAtName], interfaceName, elementName);
-        var instance = document.createElement(elementName, { is: element.name });
-        parentElement.appendChild(instance);
-
-        assert_array_equals(element.takeLog().types(), ['constructed', 'connected']);
-        instance[jsAtName] = jsAtValue1;
-        assert_array_equals(element.takeLog().types(), ['attributeChanged']);
-        instance[jsAtName] = jsAtValue2;
-        var logEntries = element.takeLog();
-        assert_array_equals(logEntries.types(), ['attributeChanged']);
-        assert_attribute_log_entry(logEntries.last(), { name: coAtName, oldValue: coAtValue1, newValue: coAtValue2, namespace: null });
-
-    }, name + ' must enqueue an attributeChanged reaction when replacing an existing attribute');
-
-    parentElement.parentNode.removeChild(parentElement);
-}
-
 //In parent node, sub node's observeAttribute which depends another attribute can enqueue by changing attribute value
 //Test reflect attribute with content values and dependent attribute 
 function testReflectAttrWithContentValuesAndDepAttr(jsAtName, coAtName, deAtName, jsAtValue1, coAtValue1, jsAtValue2, coAtValue2, deAtValue, name, elementName, pElementName, interfaceName) {
diff --git a/tests/wpt/web-platform-tests/custom-elements/reactions/resources/reactions.js b/tests/wpt/web-platform-tests/custom-elements/reactions/resources/reactions.js
index c7b1851c7bf..84d039bad9f 100644
--- a/tests/wpt/web-platform-tests/custom-elements/reactions/resources/reactions.js
+++ b/tests/wpt/web-platform-tests/custom-elements/reactions/resources/reactions.js
@@ -168,6 +168,41 @@ function testReflectBooleanAttribute(jsAttributeName, contentAttributeName, name
     testReflectAttributeWithContentValues(jsAttributeName, contentAttributeName, true, '', false, null, name, elementName, interfaceName);
 }
 
+function testReflectAttributeWithContentValuesAndParentNode(jsAttributeName, contentAttributeName, validValue1, contentValue1, validValue2, contentValue2, name, elementName, getParentElement, interfaceName) {
+    let parentElement = getParentElement();
+
+    test(() => {
+        let element = define_build_in_custom_element([contentAttributeName], interfaceName, elementName);
+        let instance = document.createElement(elementName, { is: element.name });
+
+        assert_array_equals(element.takeLog().types(), ['constructed']);
+        parentElement.appendChild(instance);
+        assert_array_equals(element.takeLog().types(), ['connected']);
+        instance[jsAttributeName] = validValue1;
+        let logEntries = element.takeLog();
+        assert_array_equals(logEntries.types(), ['attributeChanged']);
+        assert_attribute_log_entry(logEntries.last(), { name: contentAttributeName, oldValue: null, newValue: contentValue1, namespace: null });
+}, name + ' must enqueue an attributeChanged reaction when adding a new attribute');
+
+    test(() => {
+        let element = define_build_in_custom_element([contentAttributeName], interfaceName, elementName);
+        let instance = document.createElement(elementName, { is: element.name });
+        parentElement.appendChild(instance);
+
+        assert_array_equals(element.takeLog().types(), ['constructed', 'connected']);
+        instance[jsAttributeName] = validValue1;
+        assert_array_equals(element.takeLog().types(), ['attributeChanged']);
+        instance[jsAttributeName] = validValue2;
+        let logEntries = element.takeLog();
+        assert_array_equals(logEntries.types(), ['attributeChanged']);
+        assert_attribute_log_entry(logEntries.last(), { name: contentAttributeName, oldValue: contentValue1, newValue: contentValue2, namespace: null });
+    }, name + ' must enqueue an attributeChanged reaction when replacing an existing attribute');
+}
+
+function testReflectAttributeWithParentNode(jsAttributeName, contentAttributeName, validValue1, validValue2, name, elementName, getParentElement, interfaceName) {
+    testReflectAttributeWithContentValuesAndParentNode(jsAttributeName, contentAttributeName, validValue1, validValue1, validValue2, validValue2, name, elementName, getParentElement, interfaceName);
+}
+
 function testAttributeAdder(testFunction, name) {
     test(function () {
         var element = define_new_custom_element(['id']);
diff --git a/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html b/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
index ab373481204..5f7e2bb0d4b 100644
--- a/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
+++ b/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
@@ -9,12 +9,23 @@
  <body>
     <h1>domparsing_XMLSerializer_serializeToString</h1>
   <script>
+const XMLNS_URI = 'http://www.w3.org/2000/xmlns/';
+
 function createXmlDoc(){
   var input = '<?xml version="1.0" encoding="UTF-8"?><root><child1>value1</child1></root>';
   var parser = new DOMParser();
   return parser.parseFromString(input, 'text/xml');
 }
 
+// Returns the root element.
+function parse(xmlString) {
+  return (new DOMParser()).parseFromString(xmlString, 'text/xml').documentElement;
+}
+
+function serialize(node) {
+  return (new XMLSerializer()).serializeToString(node);
+}
+
 test(function() {
   var serializer = new XMLSerializer();
   var root = createXmlDoc().documentElement;
@@ -40,6 +51,78 @@ test(function() {
   assert_equals(xmlString, '<root xmlns="urn:bar"><outer xmlns=""><inner>value1</inner></outer></root>');
 }, 'Check if there is no redundant empty namespace declaration.');
 
+test(function() {
+  const root = parse('<root xmlns="uri1"/>');
+  const child = root.ownerDocument.createElement('child');
+  child.setAttributeNS(XMLNS_URI, 'xmlns', 'FAIL1');
+  root.appendChild(child);
+  const child2 = root.ownerDocument.createElementNS('uri2', 'child2');
+  child2.setAttributeNS(XMLNS_URI, 'xmlns', 'FAIL2');
+  root.appendChild(child2);
+  const child3 = root.ownerDocument.createElementNS('uri1', 'child3');
+  child3.setAttributeNS(XMLNS_URI, 'xmlns', 'FAIL3');
+  root.appendChild(child3);
+  const child4 = root.ownerDocument.createElementNS('uri4', 'child4');
+  child4.setAttributeNS(XMLNS_URI, 'xmlns', 'uri4');
+  root.appendChild(child4);
+  const child5 = root.ownerDocument.createElement('child5');
+  child5.setAttributeNS(XMLNS_URI, 'xmlns', '');
+  root.appendChild(child5);
+  assert_equals(serialize(root), '<root xmlns="uri1"><child xmlns=""/><child2 xmlns="uri2"/><child3/><child4 xmlns="uri4"/><child5 xmlns=""/></root>');
+}, 'Check if inconsistent xmlns="..." is dropped.');
+
+test(function() {
+  let root = parse('<r xmlns:xx="uri"></r>');
+  root.setAttributeNS('uri', 'name', 'v');
+  assert_equals(serialize(root), '<r xmlns:xx="uri" xx:name="v"/>');
+
+  let root2 = parse('<r xmlns:xx="uri"><b/></r>');
+  let child = root2.firstChild;
+  child.setAttributeNS('uri', 'name', 'v');
+  assert_equals(serialize(root2), '<r xmlns:xx="uri"><b xx:name="v"/></r>');
+
+  let root3 = parse('<r xmlns:x0="uri" xmlns:x2="uri"><b xmlns:x1="uri"/></r>');
+  let child3 = root3.firstChild;
+  child3.setAttributeNS('uri', 'name', 'v');
+  assert_equals(serialize(root3),
+                '<r xmlns:x0="uri" xmlns:x2="uri"><b xmlns:x1="uri" x1:name="v"/></r>',
+                'Should choose the nearest prefix');
+}, 'Check if an attribute with namespace and no prefix is serialized with the nearest-declared prefix');
+
+test(function() {
+  let root = parse('<el1 xmlns:p="u1" xmlns:q="u1"><el2 xmlns:q="u2"/></el1>');
+  root.firstChild.setAttributeNS('u1', 'name', 'v');
+  assert_equals(serialize(root),
+                '<el1 xmlns:p="u1" xmlns:q="u1"><el2 xmlns:q="u2" q:name="v"/></el1>');
+  // Maybe this is a specification error.
+}, 'Check if an attribute with namespace and no prefix is serialized with the nearest-declared prefix even if the prefix is assigned to another namespace.');
+
+test(function() {
+  let root = parse('<r xmlns:xx="uri"></r>');
+  root.setAttributeNS('uri', 'p:name', 'v');
+  assert_equals(serialize(root), '<r xmlns:xx="uri" xx:name="v"/>');
+
+  let root2 = parse('<r xmlns:xx="uri"><b/></r>');
+  let child = root2.firstChild;
+  child.setAttributeNS('uri', 'p:name', 'value');
+  assert_equals(serialize(root2),
+                '<r xmlns:xx="uri"><b xx:name="value"/></r>');
+}, 'Check if the prefix of an attribute is replaced with another existing prefix mapped to the same namespace URI.');
+
+test(function() {
+  let root = parse('<r xmlns:xx="uri"></r>');
+  root.setAttributeNS('uri2', 'p:name', 'value');
+  assert_equals(serialize(root),
+                '<r xmlns:xx="uri" xmlns:ns1="uri2" ns1:name="value"/>');
+}, 'Check if the prefix of an attribute is NOT preserved in a case where neither its prefix nor its namespace URI is not already used.');
+
+test(function() {
+  let root = parse('<r xmlns:xx="uri"></r>');
+  root.setAttributeNS('uri2', 'xx:name', 'value');
+  assert_equals(serialize(root),
+                '<r xmlns:xx="uri" xmlns:ns1="uri2" ns1:name="value"/>');
+}, 'Check if the prefix of an attribute is replaced with a generated one in a case where the prefix is already mapped to a different namespace URI.');
+
 test(function() {
   var serializer = new XMLSerializer();
   var parser = new DOMParser();
@@ -91,6 +174,16 @@ test(function() {
   assert_equals(xmlString, '<root xmlns:ns2="uri2"><child xmlns:ns1="uri1" xmlns:ns1="uri3" ns1:attr1="value1"/></root>');
 }, 'Check if "ns1" is generated even if the element already has xmlns:ns1.');
 
+test(function() {
+  const root = (new Document()).createElement('root');
+  root.setAttributeNS('http://www.w3.org/1999/xlink', 'href', 'v');
+  assert_equals(serialize(root), '<root xmlns:ns1="http://www.w3.org/1999/xlink" ns1:href="v"/>');
+
+  const root2 = (new Document()).createElement('root');
+  root2.setAttributeNS('http://www.w3.org/1999/xlink', 'xl:type', 'v');
+  assert_equals(serialize(root2), '<root xmlns:xl="http://www.w3.org/1999/xlink" xl:type="v"/>');
+}, 'Check if no special handling for XLink namespace unlike HTML serializer.');
+
 </script>
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/element-timing/observe-svg-image.html b/tests/wpt/web-platform-tests/element-timing/observe-svg-image.html
new file mode 100644
index 00000000000..327ab69668b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/observe-svg-image.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe image inside SVG</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+let beforeRender;
+async_test(function (t) {
+  const observer = new PerformanceObserver(
+    t.step_func_done(function(entryList) {
+      assert_equals(entryList.getEntries().length, 1);
+      const entry = entryList.getEntries()[0];
+      checkElement(entry, 'my_svg', beforeRender);
+      // Assume viewport has size at least 200, so the element is fully visible.
+      checkRect(entry, [0, 200, 0, 200]);
+    })
+  );
+  observer.observe({entryTypes: ['element']});
+  beforeRender = performance.now();
+}, "Able to observe svg image.");
+</script>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<svg>
+  <image href='resources/circle.svg' elementtiming='my_svg'/>
+</svg>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/embed.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/embed.tentative.https.sub.html
index 1c69c021acc..6f0c4395950 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/embed.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/embed.tentative.https.sub.html
@@ -13,7 +13,7 @@
       let e = document.createElement('embed');
       e.src = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"embed", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"embed", "site":"same-origin", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -32,7 +32,7 @@
       let e = document.createElement('embed');
       e.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"embed", "site":"same-site", "user":"?F"};
+        let expected = {"dest":"embed", "site":"same-site", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -51,7 +51,7 @@
       let e = document.createElement('embed');
       e.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"embed", "site":"cross-site", "user":"?F"};
+        let expected = {"dest":"embed", "site":"cross-site", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/fetch.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/fetch.tentative.https.sub.html
index f6460b4efca..dc4b977ac6e 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/fetch.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/fetch.tentative.https.sub.html
@@ -3,6 +3,7 @@
 <script src=/resources/testharnessreport.js></script>
 <script src=/fetch/sec-metadata/resources/helper.js></script>
 <script>
+  // Site
   promise_test(t => {
     return fetch("https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/echo-as-json.py")
         .then(r => r.json())
@@ -10,7 +11,8 @@
           assert_header_equals(j, {
             "dest": "empty",
             "site": "same-origin",
-            "user":"?F"
+            "user": "?F",
+            "mode": "cors",
           });
         });
   }, "Same-origin fetch");
@@ -22,7 +24,8 @@
           assert_header_equals(j, {
             "dest": "empty",
             "site": "same-site",
-            "user":"?F"
+            "user": "?F",
+            "mode": "cors",
           });
         });
   }, "Same-site fetch");
@@ -34,8 +37,49 @@
           assert_header_equals(j, {
             "dest": "empty",
             "site": "cross-site",
-            "user":"?F"
+            "user": "?F",
+            "mode": "cors",
           });
         });
   }, "Cross-site fetch");
+
+  // Mode
+  promise_test(t => {
+    return fetch("https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/echo-as-json.py", {mode: "same-origin"})
+        .then(r => r.json())
+        .then(j => {
+          assert_header_equals(j, {
+            "dest": "empty",
+            "site": "same-origin",
+            "user": "?F",
+            "mode": "same-origin",
+          });
+        });
+  }, "Same-origin mode");
+
+  promise_test(t => {
+    return fetch("https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/echo-as-json.py", {mode: "cors"})
+        .then(r => r.json())
+        .then(j => {
+          assert_header_equals(j, {
+            "dest": "empty",
+            "site": "same-origin",
+            "user": "?F",
+            "mode": "cors",
+          });
+        });
+  }, "CORS mode");
+
+  promise_test(t => {
+    return fetch("https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/echo-as-json.py", {mode: "no-cors"})
+        .then(r => r.json())
+        .then(j => {
+          assert_header_equals(j, {
+            "dest": "empty",
+            "site": "same-origin",
+            "user": "?F",
+            "mode": "no-cors",
+          });
+        });
+  }, "no-CORS mode");
 </script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/font.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/font.tentative.https.sub.html
index d2bcf692884..9792f2dce94 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/font.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/font.tentative.https.sub.html
@@ -46,7 +46,7 @@
     promise_test(t => {
       return new Promise((resolve, reject) => {
         let key = "font-same-origin";
-        let expected = {"dest":"font", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"font", "site":"same-origin", "user":"?F", "mode": "cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -58,7 +58,7 @@
     promise_test(t => {
       return new Promise((resolve, reject) => {
         let key = "font-same-site";
-        let expected = {"dest":"font", "site":"same-site", "user":"?F"};
+        let expected = {"dest":"font", "site":"same-site", "user":"?F", "mode": "cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -70,7 +70,7 @@
     promise_test(t => {
       return new Promise((resolve, reject) => {
         let key = "font-cross-site";
-        let expected = {"dest":"font", "site":"cross-site", "user":"?F"};
+        let expected = {"dest":"font", "site":"cross-site", "user":"?F", "mode": "cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.https.sub.html
index 6ee14300296..73bd90745d1 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.https.sub.html
@@ -14,7 +14,8 @@
       assert_header_equals(e.data, {
         "dest": "nested-document",
         "site": "same-origin",
-        "user":"?F"
+        "user": "?F",
+        "mode": "navigate"
       });
       t.done();
     }));
@@ -32,7 +33,8 @@
       assert_header_equals(e.data, {
         "dest": "nested-document",
         "site": "same-site",
-        "user": "?F"
+        "user": "?F",
+        "mode": "navigate"
       });
       t.done();
     }));
@@ -50,7 +52,8 @@
       assert_header_equals(e.data, {
         "dest": "nested-document",
         "site": "cross-site",
-        "user": "?F"
+        "user": "?F",
+        "mode": "navigate"
       });
       t.done();
     }));
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.sub.html
index ce31a818251..eab2d3f5886 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/iframe.tentative.sub.html
@@ -14,7 +14,8 @@
       assert_header_equals(e.data, {
         "dest": "",
         "site": "",
-        "user": ""
+        "user": "",
+        "mode": "",
       });
       t.done();
     }));
@@ -32,7 +33,8 @@
       assert_header_equals(e.data, {
         "dest": "",
         "site": "",
-        "user": ""
+        "user": "",
+        "mode": "",
       });
       t.done();
     }));
@@ -50,7 +52,8 @@
       assert_header_equals(e.data, {
         "dest": "",
         "site": "",
-        "user": ""
+        "user": "",
+        "mode": "",
       });
       t.done();
     }));
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/img.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/img.tentative.https.sub.html
index c5c389503cc..252b220011c 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/img.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/img.tentative.https.sub.html
@@ -21,7 +21,8 @@
         assert_header_equals(got, {
           "dest": "image",
           "site": "same-origin",
-          "user": "?F"
+          "user": "?F",
+          "mode": "cors", // Because `loadImageInWindow` tacks on `crossorigin`
         });
       }),
       [],
@@ -42,7 +43,8 @@
         assert_header_equals(got, {
           "dest": "image",
           "site": "same-site",
-          "user": "?F"
+          "user": "?F",
+          "mode": "cors", // Because `loadImageInWindow` tacks on `crossorigin`
         });
       }),
       [],
@@ -63,7 +65,8 @@
         assert_header_equals(got, {
           "dest": "image",
           "site": "cross-site",
-          "user": "?F"
+          "user": "?F",
+          "mode": "cors", // Because `loadImageInWindow` tacks on `crossorigin`
         });
       }),
       [],
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/object.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/object.tentative.https.sub.html
index 0b9839470d1..2a0e8de8556 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/object.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/object.tentative.https.sub.html
@@ -13,7 +13,7 @@
       let e = document.createElement('object');
       e.data = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"object", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"object", "site":"same-origin", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -32,7 +32,7 @@
       let e = document.createElement('object');
       e.data = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"object", "site":"same-site", "user":"?F"};
+        let expected = {"dest":"object", "site":"same-site", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -51,7 +51,7 @@
       let e = document.createElement('object');
       e.data = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"object", "site":"cross-site", "user":"?F"};
+        let expected = {"dest":"object", "site":"cross-site", "user":"?F", "mode":"no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html
index 56d88d9156c..f88cf140d4e 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html
@@ -12,7 +12,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
@@ -38,7 +38,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
@@ -64,7 +64,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html
index f6d18f568f1..688c697ac93 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-cross-site.tentative.https.sub.html
@@ -14,7 +14,7 @@ promise_test(t => {
       e.src = "https://{{host}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=" +// same-origin
       "https://{{hosts[alt][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=" +// cross-site
       "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;// same-origin
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html
index 4756a79ab25..bc79f7810a1 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/multiple-redirect-same-site.tentative.https.sub.html
@@ -14,7 +14,7 @@ promise_test(t => {
       e.src = "https://{{host}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=" +// same-origin
       "https://{{hosts[][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=" +// same-site
       "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;// same-origin
-      let expected = {"dest":"image", "site":"same-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"same-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html
index 8558d6890e6..a5323921c26 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-origin-redirect.tentative.https.sub.html
@@ -12,7 +12,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "/xhr/resources/redirect.py?location=https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"same-origin", "user":"?F"};
+      let expected = {"dest":"image", "site":"same-origin", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
@@ -39,7 +39,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "/xhr/resources/redirect.py?location=https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"same-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"same-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
@@ -66,7 +66,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "/xhr/resources/redirect.py?location=https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html
index 8e05b255b88..92749ae0b80 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/redirect/same-site-redirect.tentative.https.sub.html
@@ -12,7 +12,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"same-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"same-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
@@ -39,7 +39,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"same-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"same-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
@@ -66,7 +66,7 @@ promise_test(t => {
 
       let e = document.createElement('img');
       e.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/xhr/resources/redirect.py?location=https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
-      let expected = {"dest":"image", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"image", "site":"cross-site", "user":"?F", "mode": "no-cors"};
 
       e.onload = e => {
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/report.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/report.tentative.https.sub.html
index 1cfa8641ba8..f1d8e06e50e 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/report.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/report.tentative.https.sub.html
@@ -22,9 +22,9 @@
     document.addEventListener("securitypolicyviolation", (e) => {
       counter++;
       if (counter == 3) {
-        generate_test({"dest":"report", "site":"same-origin", "user":"?F"}, "same-origin");
-        generate_test({"dest":"report", "site":"same-site", "user":"?F"}, "same-site");
-        generate_test({"dest":"report", "site":"cross-site", "user":"?F"}, "cross-site");
+        generate_test({"dest":"report", "site":"same-origin", "user":"?F", "mode": "no-cors"}, "same-origin");
+        generate_test({"dest":"report", "site":"same-site", "user":"?F", "mode": "no-cors"}, "same-site");
+        generate_test({"dest":"report", "site":"cross-site", "user":"?F", "mode": "no-cors"}, "cross-site");
       }
     });
   }, "Initialization.");
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
index 1a9ec154e02..4bee68996e8 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
@@ -4,8 +4,7 @@ function assert_header_equals(value, expected) {
     value = JSON.parse(value);
   }
   assert_equals(value.dest, expected.dest, "dest");
-  // Mode is commented out as no test cases have been filled out yet
-  // assert_equals(value.mode, expected.mode, "mode");
+  assert_equals(value.mode, expected.mode, "mode");
   assert_equals(value.site, expected.site, "site");
   assert_equals(value.user, expected.user, "user");
 }
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.https.sub.html
index d76378f1dd8..a35e753c789 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.https.sub.html
@@ -12,7 +12,8 @@
     assert_header_equals(header, {
       "dest": "script",
       "site": "same-origin",
-      "user":"?F"
+      "user": "?F",
+      "mode": "no-cors",
     });
   }, "Same-origin script");
 </script>
@@ -26,7 +27,8 @@
     assert_header_equals(header, {
       "dest": "script",
       "site": "same-site",
-      "user":"?F"
+      "user": "?F",
+      "mode": "no-cors",
     });
   }, "Same-site script");
 </script>
@@ -40,7 +42,23 @@
     assert_header_equals(header, {
       "dest": "script",
       "site": "cross-site",
-      "user":"?F"
+      "user": "?F",
+      "mode": "no-cors",
     });
   }, "Cross-site script");
 </script>
+
+<!-- Same-origin script, CORS mode -->
+<script src="https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/echo-as-script.py" crossorigin="anonymous"></script>
+<script>
+  test(t => {
+    t.add_cleanup(_ => { header = null; });
+
+    assert_header_equals(header, {
+      "dest": "script",
+      "site": "same-origin",
+      "user": "?F",
+      "mode": "cors",
+    });
+  }, "Same-origin CORS script");
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.sub.html
index 482f4b98f9e..3218a40abde 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/script.tentative.sub.html
@@ -12,7 +12,8 @@
     assert_header_equals(header, {
       "dest": "",
       "site": "",
-      "user": ""
+      "user": "",
+      "mode": "",
     });
   }, "Non-secure same-origin script => No headers");
 </script>
@@ -26,7 +27,8 @@
     assert_header_equals(header, {
       "dest": "",
       "site": "",
-      "user": ""
+      "user": "",
+      "mode": "",
     });
   }, "Non-secure same-site script => No headers");
 </script>
@@ -40,7 +42,8 @@
     assert_header_equals(header, {
       "dest": "",
       "site": "",
-      "user": ""
+      "user": "",
+      "mode": "",
     });
   }, "Non-secure cross-site script => No headers");
 </script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
index d0b86d2d9a8..5b7ee772b61 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
@@ -35,7 +35,7 @@
     promise_test(t => {
     return new Promise((resolve, reject) => {
       let key = "serviceworker-same-origin";
-      let expected = {"dest":"serviceworker", "site":"same-origin", "user":"?F"};
+      let expected = {"dest":"serviceworker", "site":"same-origin", "user":"?F", "mode": "same-origin"};
       fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
         .then(response => response.text())
         .then(text => assert_header_equals(text, expected))
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/sharedworker.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/sharedworker.tentative.https.sub.html
index 66f7d5b9d8d..cfeadd8d8e2 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/sharedworker.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/sharedworker.tentative.https.sub.html
@@ -26,7 +26,7 @@
     promise_test(t => {
       return new Promise((resolve, reject) => {
         let key = "sharedworker-same-origin";
-        let expected = {"dest":"sharedworker", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"sharedworker", "site":"same-origin", "user":"?F", "mode": "same-origin"};
 
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/style.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/style.tentative.https.sub.html
index 9697db75c82..4ae12662a29 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/style.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/style.tentative.https.sub.html
@@ -14,7 +14,7 @@
       e.rel = "stylesheet";
       e.href = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"style", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"style", "site":"same-origin", "user":"?F", "mode": "no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -34,7 +34,7 @@
       e.rel = "stylesheet";
       e.href = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"style", "site":"same-site", "user":"?F"};
+        let expected = {"dest":"style", "site":"same-site", "user":"?F", "mode": "no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -54,7 +54,7 @@
       e.rel = "stylesheet";
       e.href = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
       e.onload = e => {
-        let expected = {"dest":"style", "site":"cross-site", "user":"?F"};
+        let expected = {"dest":"style", "site":"cross-site", "user":"?F", "mode": "no-cors"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
@@ -65,6 +65,27 @@
       document.body.appendChild(e);
     })
   }, "Cross-Site style");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "style-same-origin";
+
+      let e = document.createElement('link');
+      e.rel = "stylesheet";
+      e.href = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=" + key;
+      e.crossOrigin = "anonymous";
+      e.onload = e => {
+        let expected = {"dest":"style", "site":"same-origin", "user":"?F", "mode": "cors"};
+        fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
+          .then(response => response.text())
+          .then(text => assert_header_equals(text, expected))
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Origin, cors style");
 </script>
 </html>
 
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/track.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/track.tentative.https.sub.html
index b9dfabf9739..89933f22c39 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/track.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/track.tentative.https.sub.html
@@ -29,7 +29,12 @@
       let el = createTrack();
       el.src = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=track-same-origin";
       el.onload = t.step_func(_ => {
-        expected = {"dest":"track", "site":"same-origin", "user":"?F"};
+        expected = {
+          "dest": "track",
+          "site": "same-origin",
+          "user": "?F",
+          "mode": "cors" // Because the `video` element has `crossorigin`
+        };
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=track-same-origin")
             .then(response => response.text())
             .then(text => assert_header_equals(text, expected))
@@ -46,7 +51,12 @@
       let el = createTrack();
       el.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=track-same-site";
       el.onload = t.step_func(_ => {
-        expected = {"dest":"track", "site":"same-site", "user":"?F"};
+        expected = {
+          "dest": "track",
+          "site": "same-site",
+          "user": "?F",
+          "mode": "cors" // Because the `video` element has `crossorigin`
+        };
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=track-same-site")
             .then(response => response.text())
             .then(text => assert_header_equals(text, expected))
@@ -65,7 +75,12 @@
       let el = createTrack();
       el.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=track-cross-site";
       el.onload = t.step_func(_ => {
-        expected = {"dest":"track", "site":"cross-site", "user":"?F"};
+        expected = {
+          "dest": "track",
+          "site": "cross-site",
+          "user": "?F",
+          "mode": "cors" // Because the `video` element has `crossorigin`
+        };
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=track-cross-site")
             .then(response => response.text())
             .then(text => assert_header_equals(text, expected))
@@ -76,4 +91,30 @@
       document.body.appendChild(video);
     });
   }, "Cross-Site track");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let video = createVideoElement();
+
+      // Unset `crossorigin` to change the CORS mode:
+      video.crossOrigin = undefined;
+
+      let el = createTrack();
+      el.src = "https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=track-same-origin";
+      el.onload = t.step_func(_ => {
+        expected = {
+          "dest":"track",
+          "site":"same-origin",
+          "user":"?F",
+          "mode": "same-origin"
+        };
+        fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=track-same-origin")
+            .then(response => response.text())
+            .then(text => assert_header_equals(text, expected))
+            .then(_ => resolve());
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, "Same-Origin, CORS track");
 </script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/window-open.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/window-open.tentative.https.sub.html
index 236268e1774..2957dad40a4 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/window-open.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/window-open.tentative.https.sub.html
@@ -17,7 +17,8 @@
       assert_header_equals(e.data, {
         "dest": "document",
         "site": "same-origin",
-        "user":"?F"
+        "user": "?F",
+        "mode": "navigate",
       });
       t.done();
     }));
@@ -33,7 +34,8 @@
       assert_header_equals(e.data, {
         "dest": "document",
         "site": "same-site",
-        "user":"?F"
+        "user": "?F",
+        "mode": "navigate",
       });
       t.done();
     }));
@@ -49,7 +51,8 @@
       assert_header_equals(e.data, {
         "dest": "document",
         "site": "cross-site",
-        "user":"?F"
+        "user": "?F",
+        "mode": "navigate",
       });
       t.done();
     }));
@@ -68,7 +71,8 @@
         assert_header_equals(e.data, {
           "dest": "document",
           "site": "same-origin",
-          "user": "?T"
+          "user": "?T",
+          "mode": "navigate",
         });
         t.done();
       }));
@@ -89,7 +93,8 @@
         assert_header_equals(e.data, {
           "dest": "document",
           "site": "same-site",
-          "user": "?T"
+          "user": "?T",
+          "mode": "navigate",
         });
         t.done();
       }));
@@ -110,7 +115,8 @@
         assert_header_equals(e.data, {
           "dest": "document",
           "site": "cross-site",
-          "user": "?T"
+          "user": "?T",
+          "mode": "navigate",
         });
         t.done();
       }));
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/worker.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/worker.tentative.https.sub.html
index fcffe91dbf7..89be6f0b5a1 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/worker.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/worker.tentative.https.sub.html
@@ -10,7 +10,7 @@
       let key = "worker-same-origin";
       let w = new Worker("/fetch/sec-metadata/resources/record-header.py?file=" + key);
       w.onmessage = e => {
-        let expected = {"dest":"worker", "site":"same-origin", "user":"?F"};
+        let expected = {"dest":"worker", "site":"same-origin", "user":"?F", "mode": "same-origin"};
         fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected))
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/xslt.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/xslt.tentative.https.sub.html
index 32349c9598e..eea2329900e 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/xslt.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/xslt.tentative.https.sub.html
@@ -12,21 +12,21 @@
       return;
 
     promise_test(t => {
-      let expected = {"dest":"xslt", "site":"same-origin", "user":"?F"};
+      let expected = {"dest":"xslt", "site":"same-origin", "user":"?F", "mode": "same-origin"};
       return fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=xslt-same-origin")
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected));
     }, "Same-Origin xslt");
 
     promise_test(t => {
-      let expected = {"dest":"xslt", "site":"same-site", "user":"?F"};
+      let expected = {"dest":"xslt", "site":"same-site", "user":"?F", "mode": "no-cors"};
       return fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=xslt-same-site")
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected));
     }, "Same-site xslt");
 
     promise_test(t => {
-      let expected = {"dest":"xslt", "site":"cross-site", "user":"?F"};
+      let expected = {"dest":"xslt", "site":"cross-site", "user":"?F", "mode": "no-cors"};
       return fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=xslt-cross-site")
           .then(response => response.text())
           .then(text => assert_header_equals(text, expected));
diff --git a/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html
new file mode 100644
index 00000000000..46280854e8f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html
@@ -0,0 +1,193 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/document_domain_frame.sub.js"></script>
+<body>
+<script>
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "control1-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "control1-2", "{{domains[www1]}}");
+  let result = await postMessageToFrame(frame1, { 'poke-at-sibling': "control1-2" });
+  assert_equals(result.data, "omg!");
+}, "Access allowed if same-origin with no 'document.domain' modification. (Sanity check)");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "control2-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "control2-2", "{{domains[www2]}}");
+  let result = await postMessageToFrame(frame1, { 'poke-at-sibling': "control2-2" });
+  assert_equals(result.data, "SecurityError");
+}, "Access not allowed if different-origin with no 'document.domain' modification. (Sanity check)");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "one-set-one-not-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "one-set-one-not-2", "{{domains[www1]}}");
+  await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+
+  let result = await postMessageToFrame(frame1, { 'poke-at-sibling': "one-set-one-not-2" });
+  assert_equals(result.data, "SecurityError");
+
+  result = await postMessageToFrame(frame2, { 'poke-at-sibling': "one-set-one-not-1" });
+  assert_equals(result.data, "SecurityError");
+}, "Access disallowed if same-origin but only one sets document.domain.");
+
+promise_test(async (t) => {
+  var frame1 = await createFrame(t, "both-set-to-existing-1", "{{domains[www1]}}");
+  var frame2 = await createFrame(t, "both-set-to-existing-2", "{{domains[www1]}}");
+  let result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame2, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, { 'poke-at-sibling': "both-set-to-existing-2" });
+  assert_equals(result.data, "omg!");
+
+  result = await postMessageToFrame(frame2, { 'poke-at-sibling': "both-set-to-existing-1" });
+  assert_equals(result.data, "omg!");
+}, "Access allowed if same-origin and both set document.domain to existing value.");
+
+promise_test(async (t) => {
+  var frame1 = await createFrame(t, "both-set-to-parent-1", "{{domains[www1]}}");
+  var frame2 = await createFrame(t, "both-set-to-parent-2", "{{domains[www2]}}");
+  let result = await postMessageToFrame(frame1, { domain: "{{domains[]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame2, { domain: "{{domains[]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, { 'poke-at-sibling': "both-set-to-parent-2" });
+  assert_equals(result.data, "omg!");
+
+  result = await postMessageToFrame(frame2, { 'poke-at-sibling': "both-set-to-parent-1" });
+  assert_equals(result.data, "omg!");
+}, "Access allowed if different-origin but both set document.domain to parent domain.");
+
+promise_test(async (t) => {
+  var frame1 = await createFrame(t, "allow-then-revoke-1", "{{domains[www1]}}");
+  var frame2 = await createFrame(t, "allow-then-revoke-2", "{{domains[www1]}}");
+  let result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame2, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, { 'poke-at-sibling': "allow-then-revoke-2" });
+  assert_equals(result.data, "omg!");
+
+  result = await postMessageToFrame(frame2, { 'poke-at-sibling': "allow-then-revoke-1" });
+  assert_equals(result.data, "omg!");
+
+  result = await postMessageToFrame(frame1, { domain: "{{domains[]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, { 'poke-at-sibling': "allow-then-revoke-2" });
+  assert_equals(result.data, "SecurityError");
+
+  result = await postMessageToFrame(frame2, { 'poke-at-sibling': "allow-then-revoke-1" });
+  assert_equals(result.data, "SecurityError");
+}, "Access disallowed again if same-origin, both set document-domain to existing value, then one sets to parent.");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "revoke-Window-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "revoke-Window-2", "{{domains[www1]}}");
+
+  let result = await postMessageToFrame(frame1, { cache: ["parent", "revoke-Window-2"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 1");
+
+  result = await postMessageToFrame(frame2, { cache: ["parent", "revoke-Window-1"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 1");
+
+  result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "SecurityError");
+
+  result = await postMessageToFrame(frame2, 'touch-cached');
+  assert_equals(result.data, "SecurityError");
+}, "Access is revoked to Window object when we stop being same effective script origin due to document.domain.");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "revoke-Location-1", "{{hosts[][www1]}}");
+  let frame2 = await createFrame(t, "revoke-Location-2", "{{domains[www1]}}");
+
+  let result = await postMessageToFrame(frame1, { cache: ["parent", "revoke-Location-2", "location"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 3");
+
+  result = await postMessageToFrame(frame2, { cache: ["parent", "revoke-Location-1", "location"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 3");
+
+  result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "SecurityError");
+
+  result = await postMessageToFrame(frame2, 'touch-cached');
+  assert_equals(result.data, "SecurityError");
+}, "Access is revoked to Location object when we stop being same effective script origin due to document.domain.");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "no-revoke-Document-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "no-revoke-Document-2", "{{domains[www1]}}");
+
+  let result = await postMessageToFrame(frame1, { cache: ["parent", "no-revoke-Document-2", "document"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 4");
+
+  result = await postMessageToFrame(frame2, { cache: ["parent", "no-revoke-Document-1", "document"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 4");
+
+  result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 4");
+
+  result = await postMessageToFrame(frame2, 'touch-cached');
+  assert_equals(result.data, "Reachable 4");
+}, "Access is not revoked to Document object when we stop being same effective script origin due to document.domain.");
+
+promise_test(async (t) => {
+  let frame1 = await createFrame(t, "no-revoke-object-1", "{{domains[www1]}}");
+  let frame2 = await createFrame(t, "no-revoke-object-2", "{{domains[www1]}}");
+
+  let result = await postMessageToFrame(frame1, { cache: ["parent", "no-revoke-object-2", "bar"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 2");
+
+  result = await postMessageToFrame(frame2, { cache: ["parent", "no-revoke-object-1", "bar"] });
+  assert_equals(result.data, "cached");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 2");
+
+  result = await postMessageToFrame(frame1, { domain: "{{domains[www1]}}" });
+  assert_equals(result.data, "Done");
+
+  result = await postMessageToFrame(frame1, 'touch-cached');
+  assert_equals(result.data, "Reachable 2");
+
+  result = await postMessageToFrame(frame2, 'touch-cached');
+  assert_equals(result.data, "Reachable 2");
+}, "Access is not revoked to random object when we stop being same effective script origin due to document.domain.");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html
new file mode 100644
index 00000000000..61f54af3593
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<script>
+  let cache = window;
+  // "foo" needs to be a var so it's a property on the global.
+  var foo = 'Reachable 1';
+  // "bar" needs to be a var so it's a property on the global.
+  var bar = { foo: 'Reachable 2' };
+  location.foo = 'Reachable 3';
+  document.foo = 'Reachable 4';
+  window.addEventListener('message', e => {
+    if (e.data.domain !== undefined) {
+      try {
+        document.domain = e.data.domain;
+        e.ports[0].postMessage('Done');
+      } catch(error) {
+        e.ports[0].postMessage(error.name);
+      }
+    } else if (e.data['poke-at-sibling'] !== undefined) {
+      try {
+        var sekrit = parent[e.data['poke-at-sibling']].document.body.querySelector('#sekrit').value;
+        e.ports[0].postMessage(sekrit);
+      } catch(error) {
+        e.ports[0].postMessage(error.name);
+      }
+    } else if (e.data.cache != undefined) {
+      let path = e.data.cache;
+      try {
+        while (path.length != 0) {
+          cache = cache[path.shift()];
+        }
+        e.ports[0].postMessage('cached');
+      } catch (error) {
+        e.ports[0].postMessage(error.name);
+      }
+    } else if (e.data == 'touch-cached') {
+      try {
+        e.ports[0].postMessage(cache.foo);
+      } catch (error) {
+        e.ports[0].postMessage(error.name);
+      }
+    } else if (e.data == 'poke-at-parent') {
+      try {
+        var sekrit = window.parent.document.body.querySelector('#sekrit').value;
+        e.ports[0].postMessage(sekrit);
+      } catch(error) {
+        e.ports[0].postMessage(error.name);
+      }
+    }
+  });
+  window.parent.postMessage('Hi!', '*');
+</script>
+<input id="sekrit" value="omg!">
diff --git a/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js
new file mode 100644
index 00000000000..b6631ea4f15
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.sub.js
@@ -0,0 +1,65 @@
+/**
+ * Utilities to be used with document_domain_frame.html.
+ */
+
+/**
+ * Send a message to the frame and resolve a promise when a response is received.
+ *
+ * Supported messages:
+ *
+ * 1) { domain: something }.  Has the subframe try to set document.domain to the
+ * given value, and message back 'Done' if that succeeds or an error name if it
+ * fails.
+ *
+ * 2) 'poke-at-parent'.  Has the subframe try to synchronously attempt to access
+ * the parent's DOM, read out a string value, and message it back to the parent.
+ * Again, sends back the error name if that fails.
+ *
+ * 3) { 'poke-at-sibling': name }.  Has the subframe try to synchronously
+ * attempt to access the DOM of the sibling with the given name, read out a
+ * string value, and message it back to the parent.
+ */
+function postMessageToFrame(frame, message) {
+  return new Promise(resolve => {
+    var c = new MessageChannel();
+    c.port1.onmessage = e => {
+      resolve({ data: e.data, frame: frame })
+    };
+    frame.contentWindow.postMessage(message, '*', [c.port2]);
+  });
+}
+
+/**
+ * Create a frame that loads document_domain_frame.html and resolves a promise
+ * when the frame is loaded enough to be sending and receiving messages.
+ *
+ * If a "name" argument is provided, that name is used for the iframe, so
+ *
+ * If a "hostname" argument is provided, that hostname is used for the load, to
+ * allow testing details of the behavior when different sorts of hostnames are
+ * used.
+ */
+function createFrame(t, name, hostname) {
+  return new Promise(resolve => {
+    var i = document.createElement('iframe');
+    if (hostname) {
+      i.src = `//${hostname}:{{location[port]}}/html/browsers/origin/relaxing-the-same-origin-restriction/support/document_domain_frame.html`;
+    } else {
+      i.src = "support/document_domain_frame.html";
+    }
+    if (name) {
+      i.name = name;
+    }
+    var listener = m => {
+      if (m.source == i.contentWindow)
+        resolve(i);
+    }
+    window.addEventListener('message', listener);
+    t.add_cleanup(() => {
+      i.remove();
+      window.removeEventListener('message', listener);
+    });
+    document.body.appendChild(i);
+  });
+}
+
diff --git a/tests/wpt/web-platform-tests/html/browsers/the-window-object/name-attribute.window.js b/tests/wpt/web-platform-tests/html/browsers/the-window-object/name-attribute.window.js
new file mode 100644
index 00000000000..f266dd7acb9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/the-window-object/name-attribute.window.js
@@ -0,0 +1,18 @@
+test(() => {
+  const frame = document.createElement("iframe"),
+        name = "A",
+        name2 = "B";
+  frame.setAttribute("name", name);
+  document.body.append(frame);
+  const frameW = frame.contentWindow;
+  assert_equals(frameW.name, name);
+  frameW.name = name2;
+  assert_equals(frame.getAttribute("name"), name);
+  assert_equals(frameW.name, name2);
+  frame.remove();
+  assert_equals(frame.getAttribute("name"), name);
+  assert_equals(frameW.name, "");
+  frameW.name = name2;
+  assert_equals(frame.getAttribute("name"), name);
+  assert_equals(frameW.name, "");
+}, "Window object's name IDL attribute");
diff --git a/tests/wpt/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a.rel-setter-01.html b/tests/wpt/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a.rel-setter-01.html
index 83c69de3014..c319266887b 100644
--- a/tests/wpt/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a.rel-setter-01.html
+++ b/tests/wpt/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a.rel-setter-01.html
@@ -13,8 +13,8 @@ test(function() {
   var a = document.getElementById("test");
 
   test(function() {
-    a.rel = "noreferrer"
-    assert_equals(a.rel, "noreferrer");
+    a.rel = "noreferrer";
+    assert_equals(a.getAttribute("rel"), "noreferrer");
   }, "Test anchor's rel setter");
 });
 </script>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html b/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html
new file mode 100644
index 00000000000..dd4c531070c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  test(t => {
+    assert_false("getUserAgent" in navigator);
+  }, "navigator.getUserAgent() is not available in non-secure contexts.");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html b/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html
new file mode 100644
index 00000000000..5f0dba6bcf7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.tentative.https.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/webrtc/dictionary-helper.js"></script>
+<script>
+  test(t => {
+    assert_true("getUserAgent" in navigator);
+  }, "navigator.getUserAgent() is exposed.");
+
+  promise_test(t => {
+    return navigator.getUserAgent()
+      .then(ua => {
+        // TODO(web-platform-tests/wpt#9106): Use `idlharness.js` once it supports dictionaries.
+        assert_string_field(ua, "brand");
+        assert_string_field(ua, "version");
+        assert_string_field(ua, "platform");
+        assert_string_field(ua, "architecture");
+        assert_string_field(ua, "model");
+      });
+  }, "navigator.getUserAgent() returns a UserAgentMetadata object.");
+</script>
diff --git a/tests/wpt/web-platform-tests/import-maps/@std/__dir__.headers b/tests/wpt/web-platform-tests/import-maps/@std/__dir__.headers
new file mode 100644
index 00000000000..e7ec0d6699d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/@std/__dir__.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript
diff --git a/tests/wpt/web-platform-tests/import-maps/@std/blank b/tests/wpt/web-platform-tests/import-maps/@std/blank
new file mode 100644
index 00000000000..38e1891bf7d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/@std/blank
@@ -0,0 +1 @@
+log.push("relative:@std/blank");
diff --git a/tests/wpt/web-platform-tests/import-maps/@std/none b/tests/wpt/web-platform-tests/import-maps/@std/none
new file mode 100644
index 00000000000..69e165cce5e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/@std/none
@@ -0,0 +1 @@
+log.push("relative:@std/none");
diff --git a/tests/wpt/web-platform-tests/import-maps/README.md b/tests/wpt/web-platform-tests/import-maps/README.md
new file mode 100644
index 00000000000..3803e350c84
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/README.md
@@ -0,0 +1,9 @@
+Tests for [Import Maps](https://github.com/WICG/import-maps).
+
+Because the spec itself is still under development and there are ongoing spec
+discussions, the tests are all tentative.
+
+Also, some tests are based on Chromium's behavior which reflects an older
+version of import maps spec ("package name maps" around May 2018), and have
+dependency to Chromium's implementation (internals.resolveModuleSpecifier).
+These dependencies should be removed, once the spec matures.
diff --git a/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html
new file mode 100644
index 00000000000..512cd7fa697
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/dynamic-import/success.tentative.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// https://github.com/WICG/import-maps/blob/master/spec.md#when-import-maps-can-be-encountered
+const t = async_test(
+  'After dynamic imports, import maps should fire error events');
+const log = [];
+// To ensure we are testing that the flag is cleared at the beginning of module
+// script loading unconditionally, not at the end of loading or not at the
+// first attempt to resolve a module specifier, trickle(d1) is used to ensure
+// the following import map is added after module loading is triggered but
+// before the first module script is parsed.
+promise_test(() => import('../../resources/empty.js?pipe=trickle(d1)'),
+             "A dynamic import succeeds");
+</script>
+<script type="importmap" onload="t.assert_unreached('onload')" onerror="t.done()">
+{
+  "imports": {
+    "../../resources/log.js?pipe=sub&name=A": "../../resources/log.js?pipe=sub&name=B"
+  }
+}
+</script>
+<script>
+promise_test(() => {
+  return import("../../resources/log.js?pipe=sub&name=A")
+    .then(() => assert_array_equals(log, ["log:A"]))
+  },
+  'After a dynamic import(), import maps are not effective');
+</script>
diff --git a/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/script-tag/success.tentative.html b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/script-tag/success.tentative.html
new file mode 100644
index 00000000000..7f319b04758
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/script-tag/success.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// https://github.com/WICG/import-maps/blob/master/spec.md#when-import-maps-can-be-encountered
+const t = async_test(
+  'After <script type="module"> import maps should fire error events');
+const log = [];
+</script>
+<script type="module" src="../../resources/empty.js?pipe=trickle(d1)"></script>
+<script type="importmap" onerror="t.done()">
+{
+  "imports": {
+    "../../resources/log.js?pipe=sub&name=A": "../../resources/log.js?pipe=sub&name=B"
+  }
+}
+</script>
+<script>
+promise_test(() => {
+  return import("../../resources/log.js?pipe=sub&name=A")
+    .then(() => assert_array_equals(log, ["log:A"]))
+  },
+  'After <script type="module"> import maps are not effective');
+</script>
diff --git a/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/worker-request/success.tentative.html b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/worker-request/success.tentative.html
new file mode 100644
index 00000000000..ceef4100aad
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/acquire-import-maps-flag/worker-request/success.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// https://github.com/WICG/import-maps/blob/master/spec.md#when-import-maps-can-be-encountered
+const t = async_test(
+  'After module worker creation, import maps should fire error events');
+const log = [];
+new Worker('../../resources/empty.js?pipe=trickle(d1)', {type: "module"});
+</script>
+<script type="importmap" onerror="t.done()">
+{
+  "imports": {
+    "../../resources/log.js?pipe=sub&name=A": "../../resources/log.js?pipe=sub&name=B"
+  }
+}
+</script>
+<script>
+promise_test(() => {
+  return import("../../resources/log.js?pipe=sub&name=A")
+    .then(() => assert_array_equals(log, ["A"]))
+  },
+  'After module worker creation import maps are not effective');
+</script>
diff --git a/tests/wpt/web-platform-tests/import-maps/bare.sub.tentative.html b/tests/wpt/web-platform-tests/import-maps/bare.sub.tentative.html
new file mode 100644
index 00000000000..5bfb6b52072
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare.sub.tentative.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+// "bare/..." (i.e. without leading "./") are bare specifiers
+// (not relative paths).
+//
+// Discussions about notations for builtin modules are ongoing, e.g.
+// https://github.com/tc39/proposal-javascript-standard-library/issues/12
+// Currently the tests expects two notations are accepted.
+// TODO: Once the discussions converge, update the tests.
+const importMap = `
+{
+  "imports": {
+    "bare/bare": "./resources/log.js?pipe=sub&name=bare",
+    "bare/cross-origin-bare": "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-bare",
+    "bare/to-data": "data:text/javascript,log.push('dataURL')",
+
+    "bare/std-blank": "std:blank",
+    "bare/blank": "@std/blank",
+    "bare/std-none": "std:none",
+    "bare/none": "@std/none",
+
+    "bare/to-bare": "bare/bare"
+  }
+}
+`;
+
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Currently, Chromium's implementation resolves import maps as a part of
+  // specifier resolution, and thus failure in import map resolution causes
+  // a parse error, not fetch error. Therefore, we use Result.PARSE_ERROR
+  // below. https://crbug.com/928435
+
+  // Bare to HTTP(S).
+  "bare/bare":
+    [Result.URL, Result.URL, "log:bare", "log:bare"],
+  "bare/cross-origin-bare":
+    [Result.URL, Result.URL, "log:cross-origin-bare", "log:cross-origin-bare"],
+
+  // Bare to data:
+  "bare/to-data":
+    [Result.URL, Result.URL, "dataURL", "dataURL"],
+
+  // Bare to built-in.
+  "bare/std-blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "bare/blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "bare/std-none":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+  "bare/none":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+
+  // Bare to bare mapping is disabled.
+  "bare/to-bare":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+};
+
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/__dir__.headers b/tests/wpt/web-platform-tests/import-maps/bare/__dir__.headers
new file mode 100644
index 00000000000..e7ec0d6699d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/__dir__.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/bare b/tests/wpt/web-platform-tests/import-maps/bare/bare
new file mode 100644
index 00000000000..1011e866b81
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/bare
@@ -0,0 +1 @@
+log.push("relative:bare/bare");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/blank b/tests/wpt/web-platform-tests/import-maps/bare/blank
new file mode 100644
index 00000000000..841d433acf7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/blank
@@ -0,0 +1 @@
+log.push("relative:bare/blank");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/cross-origin-bare b/tests/wpt/web-platform-tests/import-maps/bare/cross-origin-bare
new file mode 100644
index 00000000000..64851cc8e24
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/cross-origin-bare
@@ -0,0 +1 @@
+log.push("relative:bare/cross-origin-bare");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/none b/tests/wpt/web-platform-tests/import-maps/bare/none
new file mode 100644
index 00000000000..2aec0d72826
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/none
@@ -0,0 +1 @@
+log.push("relative:bare/none");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/std-blank b/tests/wpt/web-platform-tests/import-maps/bare/std-blank
new file mode 100644
index 00000000000..5ded98fd382
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/std-blank
@@ -0,0 +1 @@
+log.push("relative:bare/std-blank");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/std-none b/tests/wpt/web-platform-tests/import-maps/bare/std-none
new file mode 100644
index 00000000000..1437d9ff1e0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/std-none
@@ -0,0 +1 @@
+log.push("relative:bare/std-none");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/to-bare b/tests/wpt/web-platform-tests/import-maps/bare/to-bare
new file mode 100644
index 00000000000..bdb3791bc94
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/to-bare
@@ -0,0 +1 @@
+log.push("relative:bare/to-bare");
diff --git a/tests/wpt/web-platform-tests/import-maps/bare/to-data b/tests/wpt/web-platform-tests/import-maps/bare/to-data
new file mode 100644
index 00000000000..6f25c5af124
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/bare/to-data
@@ -0,0 +1 @@
+log.push("relative:bare/to-data");
diff --git a/tests/wpt/web-platform-tests/import-maps/builtin-empty.tentative.html b/tests/wpt/web-platform-tests/import-maps/builtin-empty.tentative.html
new file mode 100644
index 00000000000..aba28d18e04
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/builtin-empty.tentative.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+const importMap = `
+{
+  "imports": {
+    "./resources/log.js?pipe=sub&name=empty": [ "@std/" ],
+    "./resources/log.js?pipe=sub&name=empty-fallback": [
+      "@std/",
+      "./resources/log.js?pipe=sub&name=empty-fallback"
+    ]
+  }
+}
+`;
+
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Discussions about notations are ongoing, e.g.
+  // https://github.com/tc39/proposal-javascript-standard-library/issues/12
+  // Currently the tests expects two notations are accepted.
+  // TODO: Once the discussions converge, update this and related tests.
+  "std:":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+  "@std/":
+    [Result.FETCH_ERROR, Result.PARSE_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+
+  "./resources/log.js?pipe=sub&name=empty":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+  "./resources/log.js?pipe=sub&name=empty-fallback":
+    [Result.URL, Result.URL, Result.URL, Result.URL],
+};
+
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/builtin-import-scheme.tentative.html b/tests/wpt/web-platform-tests/import-maps/builtin-import-scheme.tentative.html
new file mode 100644
index 00000000000..6a27ef5aee2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/builtin-import-scheme.tentative.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Currently direct use of import: URLs are disabled.
+  "import:std:blank":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+  "import:@std/blank":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+  "import:std:none":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+  "import:@std/none":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+};
+
+doTests(null, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/builtin.tentative.html b/tests/wpt/web-platform-tests/import-maps/builtin.tentative.html
new file mode 100644
index 00000000000..e85289e4d88
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/builtin.tentative.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Discussions about notations are ongoing, e.g.
+  // https://github.com/tc39/proposal-javascript-standard-library/issues/12
+  // Currently the tests expects two notations are accepted.
+  // TODO: Once the discussions converge, update this and related tests.
+  "std:blank":
+    [Result.BUILTIN, Result.FETCH_ERROR, Result.BUILTIN, Result.BUILTIN],
+  "@std/blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "std:none":
+    [Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR, Result.FETCH_ERROR],
+  "@std/none":
+    [Result.URL, Result.URL, Result.FETCH_ERROR, Result.FETCH_ERROR],
+};
+
+doTests(null, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/data.sub.tentative.html b/tests/wpt/web-platform-tests/import-maps/data.sub.tentative.html
new file mode 100644
index 00000000000..1c7172bf7c6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/data.sub.tentative.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+// "bare/..." (i.e. without leading "./") are bare specifiers
+// (not relative paths).
+//
+// Discussions about notations for builtin modules are ongoing, e.g.
+// https://github.com/tc39/proposal-javascript-standard-library/issues/12
+// Currently the tests expects two notations are accepted.
+// TODO: Once the discussions converge, update the tests.
+const importMap = `
+{
+  "imports": {
+    "bare": "./resources/log.js?pipe=sub&name=bare",
+
+    "data:text/javascript,log.push('data:foo')": "./resources/log.js?pipe=sub&name=foo",
+    "data:text/javascript,log.push('data:cross-origin-foo')": "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-foo",
+    "data:text/javascript,log.push('data:to-data')": "data:text/javascript,log.push('dataURL')",
+
+    "data:text/javascript,log.push('data:std-blank')": "std:blank",
+    "data:text/javascript,log.push('data:blank')": "@std/blank",
+    "data:text/javascript,log.push('data:std-none')": "std:none",
+    "data:text/javascript,log.push('data:none')": "@std/none",
+
+    "data:text/javascript,log.push('data:to-bare')": "bare"
+  }
+}
+`;
+
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Currently, Chromium's implementation resolves import maps as a part of
+  // specifier resolution, and thus failure in import map resolution causes
+  // a parse error, not fetch error. Therefore, we use Result.PARSE_ERROR
+  // below. https://crbug.com/928435
+
+  // data: to HTTP(S).
+  "data:text/javascript,log.push('data:foo')":
+    [Result.URL, Result.URL, "log:foo", "log:foo"],
+  "data:text/javascript,log.push('data:cross-origin-foo')":
+    [Result.URL, Result.URL, "log:cross-origin-foo", "log:cross-origin-foo"],
+
+  // data: to data:
+  "data:text/javascript,log.push('data:to-data')":
+    [Result.URL, Result.URL, "dataURL", "dataURL"],
+
+  // data: to built-in.
+  "data:text/javascript,log.push('data:std-blank')":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "data:text/javascript,log.push('data:blank')":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "data:text/javascript,log.push('data:std-none')":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+  "data:text/javascript,log.push('data:none')":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+
+  // data: to bare mapping is disabled.
+  "data:text/javascript,log.push('data:to-bare')":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+};
+
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/fallback-disallowed.sub.tentative.html b/tests/wpt/web-platform-tests/import-maps/fallback-disallowed.sub.tentative.html
new file mode 100644
index 00000000000..3f89e8f12df
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/fallback-disallowed.sub.tentative.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+// Fallbacks from external URLs (such as HTTPS URLs) are
+// blocked by ongoing spec discussions, for example
+// https://github.com/WICG/import-maps/issues/76.
+// https://crbug.com/928435
+//
+// This test, as well as Chromium's implementation, rejects broader range of
+// fallbacks (not only those from HTTPS), to avoid potential spec and
+// interoperability issues.
+// The only allowed fallback pattern is fallbacks from bare specifiers with
+// two elements, which are listed in fallback.sub.tentative.html.
+const importMap = `
+{
+  "imports": {
+    "bare": "./resources/log.js?pipe=sub&name=bare",
+
+    "./resources/log.js?pipe=sub&name=http-to-builtin": [
+      "./resources/log.js?pipe=sub&name=http-to-builtin",
+      "@std/blank"
+    ],
+
+    "./resources/log.js?pipe=sub&name=fallback-to-different-url-1": [
+      "@std/blank",
+      "./resources/log.js?pipe=sub&name=something-different"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-to-different-url-2": [
+      "@std/none",
+      "./resources/log.js?pipe=sub&name=something-different2"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-to-different-origin-1": [
+      "@std/blank",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=fallback-to-different-origin-1"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-to-different-origin-2": [
+      "@std/none",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=fallback-to-different-origin-2"
+    ],
+
+    "./resources/log.js?pipe=sub&name=more-than-two-values-1": [
+      "@std/none",
+      "@std/blank",
+      "./resources/log.js?pipe=sub&name=more-than-two-values-1"
+    ],
+    "./resources/log.js?pipe=sub&name=more-than-two-values-2": [
+      "@std/none",
+      "./resources/log.js?pipe=sub&name=more-than-two-values-2",
+      "@std/blank"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-from-http": [
+      "./resources/log.js?pipe=sub&name=non-built-in",
+      "./resources/log.js?pipe=sub&name=fallback-from-http"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-from-data-1": [
+      "data:text/plain,",
+      "./resources/log.js?pipe=sub&name=fallback-from-http"
+    ],
+    "./resources/log.js?pipe=sub&name=fallback-from-data-2": [
+      "data:text/javascript,log.push('dataURL')",
+      "./resources/log.js?pipe=sub&name=fallback-from-http"
+    ]
+  }
+}
+`;
+const tests = {};
+for (const key in JSON.parse(importMap).imports) {
+  if (key === "bare") {
+    continue;
+  }
+  tests[key] =
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR];
+}
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/fallback.sub.tentative.html b/tests/wpt/web-platform-tests/import-maps/fallback.sub.tentative.html
new file mode 100644
index 00000000000..4cf3e18182a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/fallback.sub.tentative.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+// This tests is for fallbacks with the pattern of
+// `"https://some.external/url": ["@std/x", "https://some.external/url"]`
+// which maps "https://some.external/url" to "@std/x" if "@std/x" is
+// implemented, or leaves it unmodified otherwise.
+//
+// This is the primary use case where fallback should work.
+// Some other patterns of fallbacks are intentionally blocked due to ongoing
+// spec issues. See fallback-disallowed.sub.tentative.html.
+const importMap = `
+{
+  "imports": {
+    "./resources/log.js?pipe=sub&name=blank": [
+      "@std/blank",
+      "./resources/log.js?pipe=sub&name=blank"
+    ],
+    "./resources/log.js?pipe=sub&name=none": [
+      "@std/none",
+      "./resources/log.js?pipe=sub&name=none"
+    ],
+    "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-blank": [
+      "@std/blank",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-blank"
+    ],
+    "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-none": [
+      "@std/none",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-none"
+    ],
+
+    "./resources/log.js?pipe=sub&name=std-blank": [
+      "std:blank",
+      "./resources/log.js?pipe=sub&name=std-blank"
+    ],
+    "./resources/log.js?pipe=sub&name=std-none": [
+      "std:none",
+      "./resources/log.js?pipe=sub&name=std-none"
+    ],
+    "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-blank": [
+      "std:blank",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-blank"
+    ],
+    "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-none": [
+      "std:none",
+      "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-none"
+    ]
+
+  }
+}
+`;
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+  // Result.URL indicates that the specifier was not re-mapped by import maps,
+  // i.e. either considered as a relative path, or fallback occured.
+  "./resources/log.js?pipe=sub&name=blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "./resources/log.js?pipe=sub&name=none":
+    [Result.URL, Result.URL, Result.URL, Result.URL],
+  "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-none":
+    [Result.URL, Result.URL, Result.URL, Result.URL],
+
+  "./resources/log.js?pipe=sub&name=std-blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "./resources/log.js?pipe=sub&name=std-none":
+    [Result.URL, Result.URL, Result.URL, Result.URL],
+  "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=std-cross-origin-none":
+    [Result.URL, Result.URL, Result.URL, Result.URL],
+};
+
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/http.sub.tentative.html b/tests/wpt/web-platform-tests/import-maps/http.sub.tentative.html
new file mode 100644
index 00000000000..bd24f353550
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/http.sub.tentative.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helper.js"></script>
+
+<script>
+// "bare/..." (i.e. without leading "./") are bare specifiers
+// (not relative paths).
+//
+// Discussions about notations for builtin modules are ongoing, e.g.
+// https://github.com/tc39/proposal-javascript-standard-library/issues/12
+// Currently the tests expects two notations are accepted.
+// TODO: Once the discussions converge, update the tests.
+const importMap = `
+{
+  "imports": {
+    "bare": "./resources/log.js?pipe=sub&name=bare",
+
+    "./resources/log.js?pipe=sub&name=foo": "./resources/log.js?pipe=sub&name=bar",
+    "./resources/log.js?pipe=sub&name=cross-origin-foo": "https://{{domains[www1]}}:{{ports[https][0]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-bar",
+    "./resources/log.js?pipe=sub&name=to-data": "data:text/javascript,log.push('dataURL')",
+
+    "./resources/log.js?pipe=sub&name=std-blank": "std:blank",
+    "./resources/log.js?pipe=sub&name=blank": "@std/blank",
+    "./resources/log.js?pipe=sub&name=std-none": "std:none",
+    "./resources/log.js?pipe=sub&name=none": "@std/none",
+
+    "./resources/log.js?pipe=sub&name=to-bare": "bare"
+  }
+}
+`;
+
+const tests = {
+  // Arrays of expected results for:
+  // - <script src type="module">,
+  // - <script src> (classic script),
+  // - static import, and
+  // - dynamic import.
+
+  // Currently, Chromium's implementation resolves import maps as a part of
+  // specifier resolution, and thus failure in import map resolution causes
+  // a parse error, not fetch error. Therefore, we use Result.PARSE_ERROR
+  // below. https://crbug.com/928435
+
+  // HTTP(S) to HTTP(S).
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=foo":
+    [Result.URL, Result.URL, "log:bar", "log:bar"],
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=cross-origin-foo":
+    [Result.URL, Result.URL, "log:cross-origin-bar", "log:cross-origin-bar"],
+
+  // HTTP(S) to data:
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=to-data":
+    [Result.URL, Result.URL, "dataURL", "dataURL"],
+
+  // HTTP(S) to built-in.
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=std-blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=blank":
+    [Result.URL, Result.URL, Result.BUILTIN, Result.BUILTIN],
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=std-none":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=none":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+
+  // HTTP(S) to bare mapping is disabled.
+  "{{location[server]}}/import-maps/resources/log.js?pipe=sub&name=to-bare":
+    [Result.URL, Result.URL, Result.PARSE_ERROR, Result.PARSE_ERROR],
+};
+
+doTests(importMap, null, tests);
+</script>
+<body>
diff --git a/tests/wpt/web-platform-tests/import-maps/module-map-key.tentative.html b/tests/wpt/web-platform-tests/import-maps/module-map-key.tentative.html
new file mode 100644
index 00000000000..13bd122c673
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/module-map-key.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script type="importmap">
+{
+  "imports": {
+    "./resources/log.js?pipe=sub&name=A": "./resources/log.js?pipe=sub&name=B"
+  }
+}
+</script>
+<script>
+const log = [];
+
+// This test reflects the Chromium's current implementation.
+// If the import map resolution is moved into the fetch spec, the module map's
+// key will become the URL/specifier BEFORE import map resolution.
+// https://crbug.com/928435
+promise_test(() => {
+  return import("./resources/log.js?pipe=sub&name=A")
+    .then(() => import("./resources/log.js?pipe=sub&name=B"))
+    .then(() => assert_array_equals(log, ["log:B"]))
+  },
+  "Module map's key is the URL after import map resolution");
+</script>
diff --git a/tests/wpt/web-platform-tests/import-maps/resolving.tentative.html b/tests/wpt/web-platform-tests/import-maps/resolving.tentative.html
new file mode 100644
index 00000000000..f2b09a7ae02
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/resolving.tentative.html
@@ -0,0 +1,81 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({allow_uncaught_exception : true});
+
+// Hacky glue code to run Jest-based tests as WPT tests.
+// Only supports resolving.js.
+function require(name) {
+  return {
+    'URL': URL,
+    'parseFromString': parseFromString,
+    'resolve': resolve
+  };
+}
+
+function expect(v) {
+  return {
+    toMatchURL: expected => assert_equals(v, expected),
+    toThrow: expected => assert_throws(expected(), v)
+  };
+}
+
+let current_message = '';
+function describe(message, f) {
+  const old = current_message;
+  if (current_message !== '') {
+    current_message += ' / ';
+  }
+  current_message += message;
+  f();
+  current_message = old;
+}
+function it(message, f) {
+  const old = current_message;
+  if (current_message !== '') {
+    current_message += ' / ';
+  }
+  current_message += message;
+  test(t => t.step_func(f)(), current_message);
+  current_message = old;
+}
+
+// Creates a new Document (via <iframe>) and add an inline import map.
+// Currently document.write() is used to make everything synchronous, which
+// is just needed for running the existing Jest-based tests easily.
+function parseFromString(mapString, mapBaseURL) {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(`
+    <base href="${mapBaseURL}">
+    <script>
+    let isError = false;
+    function onError() {
+      isError = true;
+    }
+    </sc` + `ript>
+    <script type="importmap" onerror="onError()">
+    ${mapString}
+    </sc` + `ript>
+  `);
+  iframe.contentDocument.close();
+  return iframe;
+}
+
+// URL resolution is tested using Chromium's `internals`.
+// TODO(hiroshige): Remove the Chromium-specific dependency.
+function resolve(specifier, map, baseURL) {
+  return internals.resolveModuleSpecifier(specifier,
+                                          baseURL,
+                                          map.contentDocument);
+}
+
+</script>
+
+<!--
+resolving.js is
+https://github.com/WICG/import-maps/blob/master/reference-implementation/__tests__/resolving.js
+-->
+<script type="module" src="resources/resolving.js"></script>
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/empty.js b/tests/wpt/web-platform-tests/import-maps/resources/empty.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/log.js b/tests/wpt/web-platform-tests/import-maps/resources/log.js
new file mode 100644
index 00000000000..a024a29bf24
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/resources/log.js
@@ -0,0 +1 @@
+log.push("log:{{GET[name]}}");
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/log.js.headers b/tests/wpt/web-platform-tests/import-maps/resources/log.js.headers
new file mode 100644
index 00000000000..cb762eff806
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/resources/log.js.headers
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: *
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/resolving.js b/tests/wpt/web-platform-tests/import-maps/resources/resolving.js
new file mode 100644
index 00000000000..ec2645e5991
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/resources/resolving.js
@@ -0,0 +1,206 @@
+'use strict';
+const { URL } = require('url');
+const { parseFromString } = require('../lib/parser.js');
+const { resolve } = require('../lib/resolver.js');
+
+const mapBaseURL = new URL('https://example.com/app/index.html');
+const scriptURL = new URL('https://example.com/js/app.mjs');
+
+function makeResolveUnderTest(mapString) {
+  const map = parseFromString(mapString, mapBaseURL);
+  return specifier => resolve(specifier, map, scriptURL);
+}
+
+describe('Unmapped', () => {
+  const resolveUnderTest = makeResolveUnderTest(`{}`);
+
+  it('should resolve ./ specifiers as URLs', () => {
+    expect(resolveUnderTest('./foo')).toMatchURL('https://example.com/js/foo');
+    expect(resolveUnderTest('./foo/bar')).toMatchURL('https://example.com/js/foo/bar');
+    expect(resolveUnderTest('./foo/../bar')).toMatchURL('https://example.com/js/bar');
+    expect(resolveUnderTest('./foo/../../bar')).toMatchURL('https://example.com/bar');
+  });
+
+  it('should resolve ../ specifiers as URLs', () => {
+    expect(resolveUnderTest('../foo')).toMatchURL('https://example.com/foo');
+    expect(resolveUnderTest('../foo/bar')).toMatchURL('https://example.com/foo/bar');
+    expect(resolveUnderTest('../../../foo/bar')).toMatchURL('https://example.com/foo/bar');
+  });
+
+  it('should resolve / specifiers as URLs', () => {
+    expect(resolveUnderTest('/foo')).toMatchURL('https://example.com/foo');
+    expect(resolveUnderTest('/foo/bar')).toMatchURL('https://example.com/foo/bar');
+    expect(resolveUnderTest('/../../foo/bar')).toMatchURL('https://example.com/foo/bar');
+    expect(resolveUnderTest('/../foo/../bar')).toMatchURL('https://example.com/bar');
+  });
+
+  it('should parse absolute fetch-scheme URLs', () => {
+    expect(resolveUnderTest('about:good')).toMatchURL('about:good');
+    expect(resolveUnderTest('https://example.net')).toMatchURL('https://example.net/');
+    expect(resolveUnderTest('https://ex%41mple.com/')).toMatchURL('https://example.com/');
+    expect(resolveUnderTest('https:example.org')).toMatchURL('https://example.org/');
+    expect(resolveUnderTest('https://///example.com///')).toMatchURL('https://example.com///');
+  });
+
+  it('should fail for absolute non-fetch-scheme URLs', () => {
+    expect(() => resolveUnderTest('mailto:bad')).toThrow(TypeError);
+    expect(() => resolveUnderTest('import:bad')).toThrow(TypeError);
+    expect(() => resolveUnderTest('javascript:bad')).toThrow(TypeError);
+    expect(() => resolveUnderTest('wss:bad')).toThrow(TypeError);
+  });
+
+  it('should fail for strings not parseable as absolute URLs and not starting with ./ ../ or /', () => {
+    expect(() => resolveUnderTest('foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('\\foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest(':foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('@foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('%2E/foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('%2E%2E/foo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('.%2Ffoo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('https://ex ample.org/')).toThrow(TypeError);
+    expect(() => resolveUnderTest('https://example.com:demo')).toThrow(TypeError);
+    expect(() => resolveUnderTest('http://[www.example.com]/')).toThrow(TypeError);
+  });
+});
+
+describe('Mapped using the "imports" key only (no scopes)', () => {
+  it('should fail when the mapping is to an empty array', () => {
+    const resolveUnderTest = makeResolveUnderTest(`{
+      "imports": {
+        "moment": null,
+        "lodash": []
+      }
+    }`);
+
+    expect(() => resolveUnderTest('moment')).toThrow(TypeError);
+    expect(() => resolveUnderTest('lodash')).toThrow(TypeError);
+  });
+
+  describe('Package-like scenarios', () => {
+    const resolveUnderTest = makeResolveUnderTest(`{
+      "imports": {
+        "moment": "/node_modules/moment/src/moment.js",
+        "moment/": "/node_modules/moment/src/",
+        "lodash-dot": "./node_modules/lodash-es/lodash.js",
+        "lodash-dot/": "./node_modules/lodash-es/",
+        "lodash-dotdot": "../node_modules/lodash-es/lodash.js",
+        "lodash-dotdot/": "../node_modules/lodash-es/"
+      }
+    }`);
+
+    it('should work for package main modules', () => {
+      expect(resolveUnderTest('moment')).toMatchURL('https://example.com/node_modules/moment/src/moment.js');
+      expect(resolveUnderTest('lodash-dot')).toMatchURL('https://example.com/app/node_modules/lodash-es/lodash.js');
+      expect(resolveUnderTest('lodash-dotdot')).toMatchURL('https://example.com/node_modules/lodash-es/lodash.js');
+    });
+
+    it('should work for package submodules', () => {
+      expect(resolveUnderTest('moment/foo')).toMatchURL('https://example.com/node_modules/moment/src/foo');
+      expect(resolveUnderTest('lodash-dot/foo')).toMatchURL('https://example.com/app/node_modules/lodash-es/foo');
+      expect(resolveUnderTest('lodash-dotdot/foo')).toMatchURL('https://example.com/node_modules/lodash-es/foo');
+    });
+
+    it('should work for package names that end in a slash by just passing through', () => {
+      // TODO: is this the right behavior, or should we throw?
+      expect(resolveUnderTest('moment/')).toMatchURL('https://example.com/node_modules/moment/src/');
+    });
+
+    it('should still fail for package modules that are not declared', () => {
+      expect(() => resolveUnderTest('underscore/')).toThrow(TypeError);
+      expect(() => resolveUnderTest('underscore/foo')).toThrow(TypeError);
+    });
+  });
+
+  describe('Tricky specifiers', () => {
+    const resolveUnderTest = makeResolveUnderTest(`{
+      "imports": {
+        "package/withslash": "/node_modules/package-with-slash/index.mjs",
+        "not-a-package": "/lib/not-a-package.mjs",
+        ".": "/lib/dot.mjs",
+        "..": "/lib/dotdot.mjs",
+        "..\\\\": "/lib/dotdotbackslash.mjs",
+        "%2E": "/lib/percent2e.mjs",
+        "%2F": "/lib/percent2f.mjs"
+      }
+    }`);
+
+    it('should work for explicitly-mapped specifiers that happen to have a slash', () => {
+      expect(resolveUnderTest('package/withslash')).toMatchURL('https://example.com/node_modules/package-with-slash/index.mjs');
+    });
+
+    it('should work when the specifier has punctuation', () => {
+      expect(resolveUnderTest('.')).toMatchURL('https://example.com/lib/dot.mjs');
+      expect(resolveUnderTest('..')).toMatchURL('https://example.com/lib/dotdot.mjs');
+      expect(resolveUnderTest('..\\')).toMatchURL('https://example.com/lib/dotdotbackslash.mjs');
+      expect(resolveUnderTest('%2E')).toMatchURL('https://example.com/lib/percent2e.mjs');
+      expect(resolveUnderTest('%2F')).toMatchURL('https://example.com/lib/percent2f.mjs');
+    });
+
+    it('should fail for attempting to get a submodule of something not declared with a trailing slash', () => {
+      expect(() => resolveUnderTest('not-a-package/foo')).toThrow(TypeError);
+    });
+  });
+
+  describe('URL-like specifiers', () => {
+    const resolveUnderTest = makeResolveUnderTest(`{
+      "imports": {
+        "/node_modules/als-polyfill/index.mjs": "@std/kv-storage",
+
+        "/lib/foo.mjs": "./more/bar.mjs",
+        "./dotrelative/foo.mjs": "/lib/dot.mjs",
+        "../dotdotrelative/foo.mjs": "/lib/dotdot.mjs",
+
+        "/lib/no.mjs": null,
+        "./dotrelative/no.mjs": [],
+
+        "/": "/lib/slash-only.mjs",
+        "./": "/lib/dotslash-only.mjs",
+
+        "/test": "/lib/test1.mjs",
+        "../test": "/lib/test2.mjs"
+      }
+    }`);
+
+    it('should remap to built-in modules', () => {
+      expect(resolveUnderTest('/node_modules/als-polyfill/index.mjs')).toMatchURL('import:@std/kv-storage');
+      expect(resolveUnderTest('https://example.com/node_modules/als-polyfill/index.mjs')).toMatchURL('import:@std/kv-storage');
+      expect(resolveUnderTest('https://///example.com/node_modules/als-polyfill/index.mjs')).toMatchURL('import:@std/kv-storage');
+    });
+
+    it('should remap to other URLs', () => {
+      expect(resolveUnderTest('https://example.com/lib/foo.mjs')).toMatchURL('https://example.com/app/more/bar.mjs');
+      expect(resolveUnderTest('https://///example.com/lib/foo.mjs')).toMatchURL('https://example.com/app/more/bar.mjs');
+      expect(resolveUnderTest('/lib/foo.mjs')).toMatchURL('https://example.com/app/more/bar.mjs');
+
+      expect(resolveUnderTest('https://example.com/app/dotrelative/foo.mjs')).toMatchURL('https://example.com/lib/dot.mjs');
+      expect(resolveUnderTest('../app/dotrelative/foo.mjs')).toMatchURL('https://example.com/lib/dot.mjs');
+
+      expect(resolveUnderTest('https://example.com/dotdotrelative/foo.mjs')).toMatchURL('https://example.com/lib/dotdot.mjs');
+      expect(resolveUnderTest('../dotdotrelative/foo.mjs')).toMatchURL('https://example.com/lib/dotdot.mjs');
+    });
+
+    it('should fail for URLs that remap to empty arrays', () => {
+      expect(() => resolveUnderTest('https://example.com/lib/no.mjs')).toThrow(TypeError);
+      expect(() => resolveUnderTest('/lib/no.mjs')).toThrow(TypeError);
+      expect(() => resolveUnderTest('../lib/no.mjs')).toThrow(TypeError);
+
+      expect(() => resolveUnderTest('https://example.com/app/dotrelative/no.mjs')).toThrow(TypeError);
+      expect(() => resolveUnderTest('/app/dotrelative/no.mjs')).toThrow(TypeError);
+      expect(() => resolveUnderTest('../app/dotrelative/no.mjs')).toThrow(TypeError);
+    });
+
+    it('should remap URLs that are just composed from / and .', () => {
+      expect(resolveUnderTest('https://example.com/')).toMatchURL('https://example.com/lib/slash-only.mjs');
+      expect(resolveUnderTest('/')).toMatchURL('https://example.com/lib/slash-only.mjs');
+      expect(resolveUnderTest('../')).toMatchURL('https://example.com/lib/slash-only.mjs');
+
+      expect(resolveUnderTest('https://example.com/app/')).toMatchURL('https://example.com/lib/dotslash-only.mjs');
+      expect(resolveUnderTest('/app/')).toMatchURL('https://example.com/lib/dotslash-only.mjs');
+      expect(resolveUnderTest('../app/')).toMatchURL('https://example.com/lib/dotslash-only.mjs');
+    });
+
+    it('should use the last entry\'s address when URL-like specifiers parse to the same absolute URL', () => {
+      expect(resolveUnderTest('/test')).toMatchURL('https://example.com/lib/test2.mjs');
+    });
+  });
+});
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/test-helper.js b/tests/wpt/web-platform-tests/import-maps/resources/test-helper.js
new file mode 100644
index 00000000000..2447bfb9435
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/resources/test-helper.js
@@ -0,0 +1,205 @@
+let log = [];
+
+function expect_log(test, expected_log) {
+  test.step_func_done(() => {
+    const actual_log = log;
+    log = [];
+    assert_array_equals(actual_log, expected_log, 'fallback log');
+  })();
+}
+
+// Results of resolving a specifier using import maps.
+const Result = {
+  // A built-in module (std:blank) is loaded.
+  BUILTIN: "builtin",
+
+  // A failure considered as a fetch error in a module script tree.
+  // <script>'s error event is fired.
+  FETCH_ERROR: "fetch_error",
+
+  // A failure considered as a parse error in a module script tree.
+  // Window's error event is fired.
+  PARSE_ERROR: "parse_error",
+
+  // The specifier is considered as a relative or absolute URL.
+  // Specifier                 Expected log
+  // ------------------------- ----------------------
+  // ...?name=foo              log:foo
+  // data:...log('foo')        foo
+  // Others, e.g. @std/blank   relative:@std/blank
+  // ------------------------- ----------------------
+  // (The last case assumes a file `@std/blank` that logs `relative:@std/blank`
+  // exists)
+  URL: "URL",
+};
+
+const Handler = {
+  // Handlers for <script> element cases.
+  // Note that on a parse error both WindowErrorEvent and ScriptLoadEvent are
+  // called.
+  ScriptLoadEvent: "<script> element's load event handler",
+  ScriptErrorEvent: "<script> element's error event handler",
+  WindowErrorEvent: "window's error event handler",
+
+  // Handlers for dynamic imports.
+  DynamicImportResolve: "dynamic import resolve",
+  DynamicImportReject: "dynamic import reject",
+};
+
+// Returns a map with Handler.* as the keys.
+function getHandlers(t, specifier, expected) {
+  let handlers = {};
+  handlers[Handler.ScriptLoadEvent] = t.unreached_func("Shouldn't load");
+  handlers[Handler.ScriptErrorEvent] =
+      t.unreached_func("script's error event shouldn't be fired");
+  handlers[Handler.WindowErrorEvent] =
+      t.unreached_func("window's error event shouldn't be fired");
+  handlers[Handler.DynamicImportResolve] =
+    t.unreached_func("dynamic import promise shouldn't be resolved");
+  handlers[Handler.DynamicImportReject] =
+    t.unreached_func("dynamic import promise shouldn't be rejected");
+
+  if (expected === Result.FETCH_ERROR) {
+    handlers[Handler.ScriptErrorEvent] = () => expect_log(t, []);
+    handlers[Handler.DynamicImportReject] = () => expect_log(t, []);
+  } else if (expected === Result.PARSE_ERROR) {
+    let error_occurred = false;
+    handlers[Handler.WindowErrorEvent] = () => { error_occurred = true; };
+    handlers[Handler.ScriptLoadEvent] = t.step_func(() => {
+      // Even if a parse error occurs, load event is fired (after
+      // window.onerror is called), so trigger the load handler only if
+      // there was no previous window.onerror call.
+      assert_true(error_occurred, "window.onerror should be fired");
+      expect_log(t, []);
+    });
+    handlers[Handler.DynamicImportReject] = t.step_func(() => {
+      assert_false(error_occurred,
+        "window.onerror shouldn't be fired for dynamic imports");
+      expect_log(t, []);
+    });
+  } else {
+    let expected_log;
+    if (expected === Result.BUILTIN) {
+      expected_log = [];
+    } else if (expected === Result.URL) {
+      const match_data_url = specifier.match(/data:.*log\.push\('(.*)'\)/);
+      const match_log_js = specifier.match(/name=(.*)/);
+      if (match_data_url) {
+        expected_log = [match_data_url[1]];
+      } else if (match_log_js) {
+        expected_log = ["log:" + match_log_js[1]];
+      } else {
+        expected_log = ["relative:" + specifier];
+      }
+    } else {
+      expected_log = [expected];
+    }
+    handlers[Handler.ScriptLoadEvent] = () => expect_log(t, expected_log);
+    handlers[Handler.DynamicImportResolve] = () => expect_log(t, expected_log);
+  }
+  return handlers;
+}
+
+// Creates an <iframe> and run a test inside the <iframe>
+// to separate the module maps and import maps in each test.
+function testInIframe(importMapString, importMapBaseURL, testScript) {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  if (!importMapBaseURL) {
+    importMapBaseURL = document.baseURI;
+  }
+  let content = `
+    <script src="/resources/testharness.js"></script>
+    <script src="/import-maps/resources/test-helper.js"></script>
+    <base href="${importMapBaseURL}">
+  `;
+  if (importMapString) {
+    content += `
+      <script type="importmap">
+      ${importMapString}
+      </sc` + `ript>
+    `;
+  }
+  content += `
+    <body>
+    <script>
+    setup({ allow_uncaught_exception: true });
+    ${testScript}
+    </sc` + `ript>
+  `;
+  iframe.contentDocument.write(content);
+  iframe.contentDocument.close();
+  fetch_tests_from_window(iframe.contentWindow);
+}
+
+function testScriptElement(importMapString, importMapBaseURL, specifier, expected, type) {
+  testInIframe(importMapString, importMapBaseURL, `
+    const t = async_test("${specifier}: <script src type=${type}>");
+    const handlers = getHandlers(t, "${specifier}", "${expected}");
+    const script = document.createElement("script");
+    script.setAttribute("type", "${type}");
+    script.setAttribute("src", "${specifier}");
+    script.addEventListener("load", handlers[Handler.ScriptLoadEvent]);
+    script.addEventListener("error", handlers[Handler.ScriptErrorEvent]);
+    window.addEventListener("error", handlers[Handler.WindowErrorEvent]);
+    document.body.appendChild(script);
+  `);
+}
+
+function testStaticImport(importMapString, importMapBaseURL, specifier, expected) {
+  testInIframe(importMapString, importMapBaseURL, `
+    const t = async_test("${specifier}: static import");
+    const handlers = getHandlers(t, "${specifier}", "${expected}");
+    const script = document.createElement("script");
+    script.setAttribute("type", "module");
+    script.setAttribute("src",
+        "/import-maps/static-import.js?pipe=sub(none)&url=" +
+        encodeURIComponent("${specifier}"));
+    script.addEventListener("load", handlers[Handler.ScriptLoadEvent]);
+    script.addEventListener("error", handlers[Handler.ScriptErrorEvent]);
+    window.addEventListener("error", handlers[Handler.WindowErrorEvent]);
+    document.body.appendChild(script);
+  `);
+}
+
+function testDynamicImport(importMapString, importMapBaseURL, specifier, expected, type) {
+  testInIframe(importMapString, importMapBaseURL, `
+    const t = async_test("${specifier}: dynamic import (from ${type})");
+    const handlers = getHandlers(t, "${specifier}", "${expected}");
+    const script = document.createElement("script");
+    script.setAttribute("type", "${type}");
+    script.innerText =
+        "import(\\"${specifier}\\")" +
+        ".then(handlers[Handler.DynamicImportResolve], " +
+        "handlers[Handler.DynamicImportReject]);";
+    script.addEventListener("error",
+        t.unreached_func("top-level inline script shouldn't error"));
+    document.body.appendChild(script);
+  `);
+}
+
+function doTests(importMapString, importMapBaseURL, tests) {
+  window.addEventListener("load", () => {
+    for (const specifier in tests) {
+      // <script src> (module scripts)
+      testScriptElement(importMapString, importMapBaseURL, specifier,
+        tests[specifier][0], "module");
+
+      // <script src> (classic scripts)
+      testScriptElement(importMapString, importMapBaseURL, specifier,
+        tests[specifier][1], "text/javascript");
+
+      // static imports.
+      testStaticImport(importMapString, importMapBaseURL, specifier,
+        tests[specifier][2]);
+
+      // dynamic imports from a module script.
+      testDynamicImport(importMapString, importMapBaseURL, specifier,
+        tests[specifier][3], "module");
+
+      // dynamic imports from a classic script.
+      testDynamicImport(importMapString, importMapBaseURL, specifier,
+        tests[specifier][3], "text/javascript");
+    }
+  });
+}
diff --git a/tests/wpt/web-platform-tests/import-maps/static-import.js b/tests/wpt/web-platform-tests/import-maps/static-import.js
new file mode 100644
index 00000000000..1686fc123a7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/import-maps/static-import.js
@@ -0,0 +1 @@
+import "{{GET[url]}}";
diff --git a/tests/wpt/web-platform-tests/interfaces/webxr.idl b/tests/wpt/web-platform-tests/interfaces/webxr.idl
index 2bc100e100d..d175729ca20 100644
--- a/tests/wpt/web-platform-tests/interfaces/webxr.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webxr.idl
@@ -78,12 +78,12 @@ callback XRFrameRequestCallback = void (DOMHighResTimeStamp time, XRFrame frame)
 [SecureContext, Exposed=Window] interface XRFrame {
   readonly attribute XRSession session;
 
-  XRViewerPose? getViewerPose(optional XRReferenceSpace referenceSpace);
-  XRInputPose? getInputPose(XRInputSource inputSource, optional XRReferenceSpace referenceSpace);
+  XRViewerPose? getViewerPose(XRReferenceSpace referenceSpace);
+  XRPose? getPose(XRSpace space, XRSpace relativeTo);
 };
 
 [SecureContext, Exposed=Window] interface XRSpace : EventTarget {
-  XRRigidTransform? getTransformTo(XRSpace other);
+
 };
 
 enum XRReferenceSpaceType {
@@ -159,8 +159,12 @@ interface XRRay {
   readonly attribute Float32Array matrix;
 };
 
-[SecureContext, Exposed=Window] interface XRViewerPose {
+[SecureContext, Exposed=Window] interface XRPose {
   readonly attribute XRRigidTransform transform;
+  readonly attribute boolean emulatedPosition;
+};
+
+[SecureContext, Exposed=Window] interface XRViewerPose : XRPose {
   readonly attribute FrozenArray<XRView> views;
 };
 
@@ -180,13 +184,8 @@ enum XRTargetRayMode {
 interface XRInputSource {
   readonly attribute XRHandedness handedness;
   readonly attribute XRTargetRayMode targetRayMode;
-};
-
-[SecureContext, Exposed=Window]
-interface XRInputPose {
-  readonly attribute boolean emulatedPosition;
-  readonly attribute XRRay targetRay;
-  readonly attribute XRRigidTransform? gripTransform;
+  readonly attribute XRSpace targetRaySpace;
+  readonly attribute XRSpace? gripSpace;
 };
 
 [SecureContext, Exposed=Window] interface XRLayer {};
diff --git a/tests/wpt/web-platform-tests/intersection-observer/resources/intersection-observer-test-utils.js b/tests/wpt/web-platform-tests/intersection-observer/resources/intersection-observer-test-utils.js
index 8683c8b570c..44f794b0883 100644
--- a/tests/wpt/web-platform-tests/intersection-observer/resources/intersection-observer-test-utils.js
+++ b/tests/wpt/web-platform-tests/intersection-observer/resources/intersection-observer-test-utils.js
@@ -72,7 +72,15 @@
 //       notifications.
 function waitForNotification(t, f) {
   requestAnimationFrame(function() {
-    requestAnimationFrame(function() { t.step_timeout(f); });
+    requestAnimationFrame(function() { t.step_timeout(f, 0); });
+  });
+}
+
+// If you need to wait until the IntersectionObserver algorithm has a chance
+// to run, but don't need to wait for delivery of the notifications...
+function waitForFrame(t, f) {
+  requestAnimationFrame(function() {
+    t.step_timeout(f, 0);
   });
 }
 
@@ -85,9 +93,19 @@ function waitForNotification(t, f) {
 //
 // Following these rules will ensure that the test suite will not abort before
 // all test steps have run.
-function runTestCycle(f, description) {
+//
+// If the 'delay' parameter to the IntersectionObserver constructor is used,
+// tests will need to add the same delay to their runTestCycle invocations, to
+// wait for notifications to be generated and delivered.
+function runTestCycle(f, description, delay) {
   async_test(function(t) {
-    waitForNotification(t, t.step_func_done(f));
+    if (delay) {
+      step_timeout(() => {
+        waitForNotification(t, t.step_func_done(f));
+      }, delay);
+    } else {
+      waitForNotification(t, t.step_func_done(f));
+    }
   }, description);
 }
 
@@ -174,4 +192,4 @@ function checkJsonEntries(actual, expected, description) {
 function checkIsIntersecting(entries, i, expected) {
   assert_equals(entries[i].isIntersecting, expected,
     'entries[' + i + '].target.isIntersecting equals ' + expected);
-}
\ No newline at end of file
+}
diff --git a/tests/wpt/web-platform-tests/intersection-observer/resources/v2-subframe.html b/tests/wpt/web-platform-tests/intersection-observer/resources/v2-subframe.html
new file mode 100644
index 00000000000..295bbf047e6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/resources/v2-subframe.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<div id="target">target</div>
+<script>
+var delay = 100;
+var results = [];
+
+function waitForNotification(f) {
+  setTimeout(() => {
+    requestAnimationFrame(function () {
+      requestAnimationFrame(function () {
+        setTimeout(f)
+      })
+    })
+  }, delay)
+}
+
+window.addEventListener("message", event => {
+  waitForNotification(() => {
+    window.parent.postMessage(results.map(e => e.isVisible), "*");
+    results = [];
+  });
+});
+
+onload = () => {
+  var target = document.getElementById("target");
+  var observer = new IntersectionObserver(entries => {
+    results = entries;
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(document.getElementById("target"));
+  window.parent.postMessage("", "*");
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/animated-occlusion.html b/tests/wpt/web-platform-tests/intersection-observer/v2/animated-occlusion.html
new file mode 100644
index 00000000000..c1eafb7fa14
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/animated-occlusion.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+@keyframes rotate {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(45deg);
+  }
+}
+#occluder {
+  will-change: transform;
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+}
+</style>
+
+<div id="target"></div>
+<div id="occluder"></div>
+
+<script>
+var vw = document.documentElement.clientWidth;
+var vh = document.documentElement.clientHeight;
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("occluder");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 in a single document using the implicit root, with an animated occluding element.", delay);
+
+function step0() {
+  occluder.style.animation = "rotate .1s linear";
+  step_timeout(() => {
+    runTestCycle(step1, "occluder.style.animation = 'rotate .1s linear'", delay);
+  }, 50);
+  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, vw, 0, vh, true, true]);
+}
+
+function step1() {
+  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, vw, 0, vh, true, false]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/blur-filter.html b/tests/wpt/web-platform-tests/intersection-observer/v2/blur-filter.html
new file mode 100644
index 00000000000..2f55066e363
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/blur-filter.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+#occluder {
+  margin-top: 10px;
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+  filter: blur(50px);
+}
+</style>
+
+<div id="target"></div>
+<div id="occluder"></div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("occluder");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay);
+
+function step0() {
+  // Occluding elements with opacity=0 should not affect target visibility.
+  occluder.style.opacity = "0";
+  runTestCycle(step2, "occluder.style.opacity = 0", delay);
+
+  // First notification should report occlusion due to blur filter.
+  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);
+}
+
+function step2() {
+  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/box-shadow.html b/tests/wpt/web-platform-tests/intersection-observer/v2/box-shadow.html
new file mode 100644
index 00000000000..bcc6980aec3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/box-shadow.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+iframe {
+  width: 100px;
+  height: 100px;
+  border: 0;
+}
+#box-shadow {
+  display: inline-block;
+  box-shadow: -50px -50px 0 50px rgba(255, 0, 0, 0.7);
+}
+</style>
+
+<iframe id=target srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe><div id=box-shadow></div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("box-shadow");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  let observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 observing an iframe element.", delay);
+
+function step0() {
+  occluder.style.boxShadow = "none";
+  runTestCycle(step1, 'occluder.style.boxShadow = "none"', delay);
+  assert_equals(entries.length, 1, "Initial notification.");
+  assert_equals(entries[0].isVisible, false, "Initially occluded.");
+}
+
+function step1() {
+  occluder.style.boxShadow = "";
+  runTestCycle(step2, 'occluder.style.boxShadow = ""', delay);
+  assert_equals(entries.length, 2, "Notification after removing box shadow.");
+  assert_equals(entries[1].isVisible, true, "Visible when box shadow removed.");
+}
+
+function step2() {
+  assert_equals(entries.length, 3, "Notification after re-adding box shadow.");
+  assert_equals(entries[2].isVisible, false, "Occluded when box shadow re-added.");
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-effects.sub.html b/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-effects.sub.html
new file mode 100644
index 00000000000..edb8f023c09
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-effects.sub.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+</style>
+
+<div id="container">
+  <iframe src="http://{{domains[www1]}}:{{ports[http][0]}}/intersection-observer/resources/v2-subframe.html"></iframe>
+</div>
+
+<script>
+async_test(function(t) {
+  let container = document.getElementById("container");
+  let iframe = document.querySelector("iframe");
+
+  function step0(event) {
+    assert_equals(event.data,"");
+  }
+
+  function step1(event) {
+    container.style.opacity = "0.99";
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([true]));
+  }
+
+  function step2(event) {
+    container.style.opacity = "";
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([false]));
+  }
+
+  function step3(event) {
+    container.style.transform = "skew(30deg)";
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([true]));
+  }
+
+  function step4(event) {
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([false]));
+  }
+
+  let steps = [step0, step1, step2, step3, step4];
+
+  window.addEventListener("message", event => {
+    if (steps.length) {
+      t.step_func(steps.shift(), event);
+      waitForFrame(t, () => {
+        iframe.contentWindow.postMessage("", "*")
+      });
+    } else {
+      t.done();
+    }
+  });
+
+}, "Intersection observer V2 test with visual effects on iframe.");
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-occlusion.sub.html b/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-occlusion.sub.html
new file mode 100644
index 00000000000..6f9fa57fb71
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/cross-origin-occlusion.sub.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+iframe {
+  width: 300px;
+  height: 150px;
+  border: none;
+}
+#occluder {
+  will-change: transform;
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+
+<iframe src="http://{{domains[www1]}}:{{ports[http][0]}}/intersection-observer/resources/v2-subframe.html"></iframe>
+<div id="occluder"></div>
+
+<script>
+async_test(function(t) {
+  let iframe = document.querySelector("iframe");
+  let occluder = document.getElementById("occluder");
+
+  function step0(event) {
+    assert_equals(event.data,"");
+  }
+
+  function step1(event) {
+    occluder.style.marginTop = "-150px";
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([true]));
+  }
+
+  function step2(event) {
+    occluder.style.marginTop = "";
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([false]));
+  }
+
+  function step3(event) {
+    assert_equals(JSON.stringify(event.data),
+                  JSON.stringify([true]));
+  }
+
+  let steps = [step0, step1, step2, step3];
+
+  window.addEventListener("message", event => {
+    if (steps.length) {
+      t.step_func(steps.shift(), event);
+      waitForFrame(t, () => {
+        iframe.contentWindow.postMessage("", "*");
+      });
+    } else {
+      t.done();
+    }
+  });
+
+}, "Intersection observer V2 test with occlusion of target in iframe.");
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/delay-test.html b/tests/wpt/web-platform-tests/intersection-observer/v2/delay-test.html
new file mode 100644
index 00000000000..086301c44d4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/delay-test.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+#occluder {
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+}
+</style>
+
+<div id="target"></div>
+<div id="occluder"></div>
+
+<script>
+async_test(t => {
+  let entries = [];
+  let delay = 100;
+  let target = document.getElementById("target");
+  let occluder = document.getElementById("occluder");
+
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  let observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  // The first notification should be sent without delay.
+  waitForNotification(t, t.step_func(step0));
+
+  function waitForDelay(timerExpiredBeforeLastFrame) {
+    requestAnimationFrame(t.step_func(() => {
+      if (timerExpiredBeforeLastFrame) {
+        // New notifications should have been generated during the previous
+        // frame and delivered by now.
+        assert_equals(entries.length, 2);
+        assert_greater_than(entries[1].time - entries[0].time, delay);
+        assert_false(entries[1].isVisible);
+        t.done();
+      } else {
+        // Observer may not have updated yet. Wait for next frame.
+        let timerExpired = performance.now() - entries[0].time >= delay;
+        waitForDelay(timerExpired);
+      }
+    }));
+  }
+
+  function step0() {
+    assert_equals(entries.length, 1);
+    assert_true(entries[0].isVisible);
+    // This should trigger a notification on the next run.
+    occluder.style.marginTop = "-10px";
+    // Enter a rAF loop until the delay timer expires.
+    waitForDelay(false);
+  }
+
+}, "'delay' parameter throttles frequency of notifications.");
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/iframe-target.html b/tests/wpt/web-platform-tests/intersection-observer/v2/iframe-target.html
new file mode 100644
index 00000000000..3e53ee5f581
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/iframe-target.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+iframe {
+  width: 150px;
+  height: 100px;
+  border: 0;
+}
+</style>
+
+<iframe srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+
+runTestCycle(function() {
+  target = document.querySelector("iframe");
+  assert_true(!!target, "target exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 observing an iframe element.", delay);
+
+function step0() {
+  checkLastEntry(entries, 0, [0, 150, 0, 100, 0, 150, 0, 100, 0, 800, 0, 600, true, true]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/simple-effects.html b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-effects.html
new file mode 100644
index 00000000000..2b7a83a9c95
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-effects.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+#effects {
+  opacity: 1;
+  filter: none;
+}
+</style>
+
+<div id="effects">
+  <div id="target"></div>
+</div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var effects;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  effects = document.getElementById("effects");
+  assert_true(!!target, "target exists");
+  assert_true(!!effects, "effects exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 in a single document using the implicit root, with a non-zero opacity ancestor.", delay);
+
+function step0() {
+  effects.style.opacity = "0.99";
+  runTestCycle(step1, "effects.style.opacity = 0.99", delay);
+  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+
+function step1() {
+  effects.style.opacity = "1";
+  runTestCycle(step2, "effects.style.opacity = 1", delay);
+  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);
+}
+
+function step2() {
+  effects.style.filter = "grayscale(50%)";
+  runTestCycle(step3, "effects.style.filter = grayscale(50%)", delay);
+  checkLastEntry(entries, 2, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+
+function step3() {
+  checkLastEntry(entries, 3, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion-svg-foreign-object.html b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion-svg-foreign-object.html
new file mode 100644
index 00000000000..fcdff67a489
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion-svg-foreign-object.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+#occluder {
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+}
+</style>
+
+<div id="target"></div>
+<svg id="svg" style="display: block">
+  <foreignObject>
+    <div id="occluder"></div>
+  </foreignObject>
+</svg>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("occluder");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay);
+
+function step0() {
+  svg.style.marginTop = "-10px";
+  runTestCycle(step1, "svg.style.marginTop = '-10px'", delay);
+  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+
+function step1() {
+  // Occluding elements with opacity=0 should not affect target visibility.
+  svg.style.opacity = "0";
+  runTestCycle(step2, "occluder.style.opacity = 0", delay);
+  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);
+}
+
+function step2() {
+  checkLastEntry(entries, 2, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion.html b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion.html
new file mode 100644
index 00000000000..ea1ee31ebe4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/simple-occlusion.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+#occluder {
+  width: 100px;
+  height: 100px;
+  background-color: blue;
+}
+</style>
+
+<div id="target"></div>
+<div id="occluder"></div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("occluder");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay);
+
+function step0() {
+  occluder.style.marginTop = "-10px";
+  runTestCycle(step1, "occluder.style.marginTop = '-10px'", delay);
+  checkLastEntry(entries, 0, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+
+function step1() {
+  // Occluding elements with opacity=0 should not affect target visibility.
+  occluder.style.opacity = "0";
+  runTestCycle(step2, "occluder.style.opacity = 0", delay);
+  checkLastEntry(entries, 1, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, false]);
+}
+
+function step2() {
+  checkLastEntry(entries, 2, [0, 100, 0, 100, 0, 100, 0, 100, 0, 800, 0, 600, true, true]);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/intersection-observer/v2/text-shadow.html b/tests/wpt/web-platform-tests/intersection-observer/v2/text-shadow.html
new file mode 100644
index 00000000000..c6445c514ee
--- /dev/null
+++ b/tests/wpt/web-platform-tests/intersection-observer/v2/text-shadow.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/intersection-observer-test-utils.js"></script>
+
+<style>
+body, html {
+  margin: 0;
+}
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+iframe {
+  width: 100px;
+  height: 100px;
+  border: 0;
+}
+#text-shadow {
+  display: inline-block;
+  font-size: 144px;
+  font-weight: 1000;
+  color: rgba(0, 0, 0, 0);
+  text-shadow: -100px 0 0 rgba(255, 0, 0, .7);
+}
+</style>
+
+<iframe id=target srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe><div id=text-shadow>O</div>
+
+<script>
+var delay = 100;
+var entries = [];
+var target;
+var occluder;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  occluder = document.getElementById("text-shadow");
+  assert_true(!!target, "target exists");
+  assert_true(!!occluder, "occluder exists");
+  let observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, {trackVisibility: true, delay: delay});
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.", delay);
+}, "IntersectionObserverV2 observing an iframe element.", delay);
+
+function step0() {
+  occluder.style.textShadow = "none";
+  runTestCycle(step1, 'occluder.style.textShadow = "none"', delay);
+  assert_equals(entries.length, 1, "Initial notification.");
+  assert_equals(entries[0].isVisible, false, "Initially occluded.");
+}
+
+function step1() {
+  occluder.style.textShadow = "";
+  runTestCycle(step2, 'occluder.style.textShadow = ""', delay);
+  assert_equals(entries.length, 2, "Notification after removing text shadow.");
+  assert_equals(entries[1].isVisible, true, "Visible when text shadow removed.");
+}
+
+function step2() {
+  assert_equals(entries.length, 3, "Notification after re-adding text shadow.");
+  assert_equals(entries[2].isVisible, false, "Occluded when text shadow re-added.");
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-stability/buffer-layout-jank.html b/tests/wpt/web-platform-tests/layout-stability/buffer-layout-jank.html
new file mode 100644
index 00000000000..f5818cfbc64
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-stability/buffer-layout-jank.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Layout Jank: query jank via the performance timeline</title>
+<body>
+<style>
+#myDiv { position: relative; width: 300px; height: 100px; }
+</style>
+<div id='myDiv'></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<!-- Delay onload by inserting a slow image.-->
+<img src="resources/slow-image.py">
+<script>
+  async_test(function (t) {
+    // Modify the position of the div.
+    document.getElementById('myDiv').style = "top: 60px";
+    function testBufferedEntry() {
+      if (performance.getEntriesByType('layoutJank').length === 0) {
+        t.step_timeout(testBufferedEntry, 0);
+        return;
+      }
+      assert_equals(performance.getEntriesByType('layoutJank').length, 1);
+      assert_equals(performance.getEntries().filter(
+        entry => entry.entryType === 'layoutJank').length, 1);
+      const entry = performance.getEntriesByType('layoutJank')[0];
+      assert_equals(entry.entryType, "layoutJank");
+      assert_equals(entry.name, "");
+      assert_equals(entry.startTime, 0.0);
+      assert_equals(entry.duration, 0.0);
+      // The layout jank fraction should be: 300 * (100 + 60) / viewport size.
+      assert_equals(entry.fraction, 300 * (100 + 60) /
+        (document.documentElement.clientWidth * document.documentElement.clientHeight));
+      t.done();
+    }
+    t.step(testBufferedEntry);
+  }, 'LayoutJank before onload is buffered into the performance timeline.');
+</script>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/layout-stability/observe-layoutjank.html b/tests/wpt/web-platform-tests/layout-stability/observe-layoutjank.html
new file mode 100644
index 00000000000..1a0533ac703
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-stability/observe-layoutjank.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Layout Jank: observe jank fraction via PerformanceObserver</title>
+<body>
+<style>
+#myDiv { position: relative; width: 300px; height: 100px; }
+</style>
+<div id='myDiv'></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  async_test(function (t) {
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        assert_equals(entry.entryType, "layoutJank");
+        assert_equals(entry.name, "");
+        assert_equals(entry.startTime, 0.0);
+        assert_equals(entry.duration, 0.0);
+        // The layout jank fraction should be: 300 * (100 + 60) / viewport size.
+        assert_equals(entry.fraction, 300 * (100 + 60) /
+          (document.documentElement.clientWidth * document.documentElement.clientHeight));
+      })
+    );
+    observer.observe({entryTypes: ['layoutJank']});
+    window.onload = () => {
+      // Modify the position of the div.
+      document.getElementById('myDiv').style = "top: 60px";
+    };
+  }, 'LayoutJank is observable via PerformanceObserver.');
+</script>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/layout-stability/resources/slow-image.py b/tests/wpt/web-platform-tests/layout-stability/resources/slow-image.py
new file mode 100644
index 00000000000..ee7988c551f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-stability/resources/slow-image.py
@@ -0,0 +1,6 @@
+import time
+
+def main(request, response):
+    # Sleep for 3s to delay onload.
+    time.sleep(3)
+    return [], ""
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/layout-stability/supported-layout-type.html b/tests/wpt/web-platform-tests/layout-stability/supported-layout-type.html
new file mode 100644
index 00000000000..e3204b52f78
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-stability/supported-layout-type.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<head>
+<title>PerformanceObserver.supportedEntryTypes contains "layoutJank"</title>
+</head>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(() => {
+  if (typeof PerformanceObserver.supportedEntryTypes === "undefined")
+    assert_unreached("supportedEntryTypes is not supported.");
+  assert_greater_than(PerformanceObserver.supportedEntryTypes.indexOf("layoutJank"), -1,
+    "There should be an entry 'layoutJank' in PerformanceObserver.supportedEntryTypes");
+}, "supportedEntryTypes contains 'layoutJank'.");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/lint.whitelist b/tests/wpt/web-platform-tests/lint.whitelist
index 64ff0296a46..0d066ac741f 100644
--- a/tests/wpt/web-platform-tests/lint.whitelist
+++ b/tests/wpt/web-platform-tests/lint.whitelist
@@ -174,6 +174,7 @@ SET TIMEOUT: html/webappapis/scripting/events/event-handler-processing-algorithm
 SET TIMEOUT: html/webappapis/scripting/processing-model-2/*
 SET TIMEOUT: IndexedDB/*
 SET TIMEOUT: infrastructure/*
+SET TIMEOUT: intersection-observer/resources/v2-subframe.html
 SET TIMEOUT: intersection-observer/target-in-different-window.html
 SET TIMEOUT: media-source/mediasource-util.js
 SET TIMEOUT: media-source/URL-createObjectURL-revoke.html
diff --git a/tests/wpt/web-platform-tests/payment-method-basic-card/empty-data-manual.https.html b/tests/wpt/web-platform-tests/payment-method-basic-card/empty-data-manual.https.html
index 2392553ebd3..ba881ee2366 100644
--- a/tests/wpt/web-platform-tests/payment-method-basic-card/empty-data-manual.https.html
+++ b/tests/wpt/web-platform-tests/payment-method-basic-card/empty-data-manual.https.html
@@ -39,8 +39,8 @@ const visaCredit = {
 };
 
 async function getCardResponse(data) {
-  const method = Object.assign({ data }, methodCard);
-  const response = await new PaymentRequest([method], defaultDetails).show();
+  const payMethod = Object.assign({ data }, method);
+  const response = await new PaymentRequest([payMethod], details).show();
   await response.complete("success");
   return response.details;
 }
@@ -54,7 +54,7 @@ function runPromiseTest(button, data, expectedCard = visaCredit, expectedAddress
   promise_test(async () => {
     const card = await getCardResponse(data);
     for (const [member, expectedValue] of Object.entries(expectedCard)) {
-      const msg = `Expected card.${member} to equal ${expectedValue}.`;
+      const msg = `Expected "card.${member}" to equal "${expectedValue}".`;
       assert_equals(card[member], expectedValue, msg);
     }
     const { billingAddress } = card;
@@ -120,6 +120,11 @@ function runPromiseTest(button, data, expectedCard = visaCredit, expectedAddress
       Returns a card on any network, because zero length supportedNetworks.
     </button>
   </li>
+  <li>
+    <button onclick="done();">
+      Done!
+    </button>
+  </li>
 </ol>
 
 <small>
diff --git a/tests/wpt/web-platform-tests/payment-method-basic-card/payment-request-canmakepayment-method.https.html b/tests/wpt/web-platform-tests/payment-method-basic-card/payment-request-canmakepayment-method.https.html
index a89c63b1bbc..f1b0c28abb8 100644
--- a/tests/wpt/web-platform-tests/payment-method-basic-card/payment-request-canmakepayment-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-method-basic-card/payment-request-canmakepayment-method.https.html
@@ -33,7 +33,7 @@ promise_test(async t => {
 function* pmiGenerator(howMany = 256) {
   for (i = 0; i < howMany; i++) {
     yield {
-      supportedMethods: `this-is-not-supported-${i}`,
+      supportedMethods: `this-is-not-supported`,
       data: { key: "value" },
     };
   }
diff --git a/tests/wpt/web-platform-tests/payment-request/META.yml b/tests/wpt/web-platform-tests/payment-request/META.yml
index 227ca551dc2..558db3e088c 100644
--- a/tests/wpt/web-platform-tests/payment-request/META.yml
+++ b/tests/wpt/web-platform-tests/payment-request/META.yml
@@ -7,3 +7,4 @@ suggested_reviewers:
   - romandev
   - edenchuang
   - aestes
+  - danyao
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html
deleted file mode 100644
index a24bac864aa..00000000000
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html
+++ /dev/null
@@ -1,95 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Manual tests for PaymentRequest.abort() method</title>
-<link rel="help" href="https://w3c.github.io/payment-request/#abort-method">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script>
-"use strict";
-setup({
-  explicit_done: true,
-  explicit_timeout: true,
-});
-const basicCard = Object.freeze({ supportedMethods: "basic-card" });
-const applePay = Object.freeze({
-  supportedMethods: "https://apple.com/apple-pay",
-  data: {
-    version: 3,
-    merchantIdentifier: "merchant.com.example",
-    countryCode: "US",
-    merchantCapabilities: ["supports3DS"],
-    supportedNetworks: ["visa"],
-  }
-});
-const defaultMethods = Object.freeze([basicCard, applePay]);
-const defaultDetails = Object.freeze({
-  total: {
-    label: "Total",
-    amount: {
-      currency: "USD",
-      value: "1.00",
-    },
-  },
-});
-
-function testShowSameRequestMultipleTimes() {
-  promise_test(async t => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show()
-    try {
-      await request.abort();
-    } catch (err) {
-      assert_unreached("Unexpected promise rejection: " + err.message);
-    }
-    await promise_rejects(t, "AbortError", acceptPromise);
-    // As request is now "closed", trying to show it will fail
-    await promise_rejects(t, "InvalidStateError", request.show());
-  }, "The same request cannot be shown multiple times.");
-}
-
-function testAbortBeforeShow() {
-  promise_test(async t => {
-    // request is in "created" state.
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    await promise_rejects(t, "InvalidStateError", request.abort());
-    // Call it again, for good measure.
-    await promise_rejects(t, "InvalidStateError", request.abort());
-    // The request's state is "created", so let's show it
-    // which changes the state to "interactive.".
-    const acceptPromise = request.show()
-    // Let's set request the state to "closed" by calling .abort()
-    try {
-      await request.abort();
-    } catch (err) {
-      assert_unreached("Unexpected promise rejection: " + err.message);
-    }
-    // The request is now "closed", so...
-    await promise_rejects(t, "InvalidStateError", request.abort());
-    await promise_rejects(t, "AbortError", acceptPromise);
-  }, "Aborting a request before it is shown doesn't prevent it from being shown later.");
-}
-</script>
-<h2>Manual tests for PaymentRequest.abort() method</h2>
-<p>
-  Click on each button in sequence from top to bottom without refreshing the
-  page. Each button will bring up the Payment Request UI window and then will
-  close it automatically. (If a payment sheet stays open, the test has failed.)
-</p>
-<ol>
-  <li>
-    <button onclick="testShowSameRequestMultipleTimes()">
-      The same request cannot be shown multiple times.
-    </button>
-  </li>
-  <li>
-    <button onclick="testAbortBeforeShow()">
-      Aborting a request before it is shown doesn't prevent it from being shown
-      later.
-    </button>
-  </li>
-  <li><button onclick="done()">Done!</button></li>
-</ol>
-<small>
-  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
-  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
-</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
index cf16401d0b0..a8a013165ee 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
@@ -47,6 +47,46 @@ promise_test(async t => {
   const promises = new Set([request.abort(), request.abort(), request.abort()]);
   assert_equals(promises.size, 3, "Must have three unique objects");
 }, "Calling abort() multiple times is always a new object.");
+
+promise_test(async t => {
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  const [abortPromise, acceptPromise] = await test_driver.bless(
+    "show payment request",
+    () => {
+      const acceptPromise = request.show()
+      acceptPromise.catch(() => {}); // no-op, just to silence unhandled rejection in devtools.
+      const abortPromise = request.abort();
+      return [abortPromise, acceptPromise];
+    });
+
+  await abortPromise;
+  await promise_rejects(t, "AbortError", acceptPromise);
+  // As request is now "closed", trying to show it will fail
+  await promise_rejects(t, "InvalidStateError", request.show());
+}, "The same request cannot be shown multiple times.");
+
+promise_test(async t => {
+  // request is in "created" state.
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  await promise_rejects(t, "InvalidStateError", request.abort());
+  // Call it again, for good measure.
+  await promise_rejects(t, "InvalidStateError", request.abort());
+  // The request's state is "created", so let's show it
+  // which changes the state to "interactive.".
+  const [abortPromise, acceptPromise] = await test_driver.bless(
+    "show payment request",
+    () => {
+      const acceptPromise = request.show()
+      // Let's set request the state to "closed" by calling .abort()
+      const abortPromise = request.abort();
+      return [abortPromise, acceptPromise];
+    });
+
+  await abortPromise;
+  // The request is now "closed", so...
+  await promise_rejects(t, "InvalidStateError", request.abort());
+  await promise_rejects(t, "AbortError", acceptPromise);
+}, "Aborting a request before it is shown doesn't prevent it from being shown later.");
 </script>
 <small>
   If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method-manual.https.html
deleted file mode 100644
index fea45500b18..00000000000
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method-manual.https.html
+++ /dev/null
@@ -1,105 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Manual tests for PaymentRequest.canMakePayment() method</title>
-<link rel="help" href="https://w3c.github.io/payment-request/#canmakepayment-method">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script>
-setup({
-  explicit_done: true,
-  explicit_timeout: true,
-});
-
-const basicCard = Object.freeze({ supportedMethods: "basic-card" });
-const applePay = Object.freeze({
-  supportedMethods: "https://apple.com/apple-pay",
-  data: {
-    version: 3,
-    merchantIdentifier: "merchant.com.example",
-    countryCode: "US",
-    merchantCapabilities: ["supports3DS"],
-    supportedNetworks: ["visa"],
-  }
-});
-const defaultMethods = Object.freeze([basicCard, applePay]);
-const defaultDetails = Object.freeze({
-  total: {
-    label: "Total",
-    amount: {
-      currency: "USD",
-      value: "1.00",
-    },
-  },
-});
-
-function testInteractiveState() {
-  promise_test(async t => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show(); // Sets state to "interactive"
-    const canMakePaymentPromise = request.canMakePayment();
-    try {
-      const result = await canMakePaymentPromise;
-      assert_true(
-        false,
-        `canMakePaymentPromise should have thrown InvalidStateError`
-      );
-    } catch (err) {
-      await promise_rejects(t, "InvalidStateError", canMakePaymentPromise);
-    } finally {
-      await request.abort();
-      await promise_rejects(t, "AbortError", acceptPromise);
-    }
-    // The state should be "closed"
-    await promise_rejects(t, "InvalidStateError", request.canMakePayment());
-  }, 'If request.[[state]] is "interactive", then return a promise rejected with an "InvalidStateError" DOMException.');
-}
-
-function testClosedState() {
-  promise_test(async t => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show(); // Sets state to "interactive"
-    acceptPromise.catch(() => {}); // no-op, just to silence unhandled rejection in devtools.
-    await request.abort(); // The state is now "closed"
-    await promise_rejects(t, "InvalidStateError", request.canMakePayment());
-    try {
-      const result = await request.canMakePayment();
-      assert_true(
-        false,
-        `should have thrown InvalidStateError, but instead returned "${result}"`
-      );
-    } catch (err) {
-      assert_equals(
-        err.name,
-        "InvalidStateError",
-        "must be an InvalidStateError."
-      );
-    }
-  }, 'If request.[[state]] is "closed", then return a promise rejected with an "InvalidStateError" DOMException.');
-}
-</script>
-
-<h2>Manual tests for PaymentRequest.canMakePayment() method</h2>
-<p>
-  Click on each button in sequence from top to bottom without refreshing the
-  page. Each button will bring up the Payment Request UI window and then will
-  close it automatically. (If a payment sheet stays open, the test has failed.)
-</p>
-<ol>
-  <li>
-    <button onclick="testInteractiveState()">
-      If request.[[state]] is "interactive", then return a promise rejected with
-      an "InvalidStateError" DOMException.
-    </button>
-  </li>
-  <li>
-    <button onclick="testClosedState()">
-      If request.[[state]] is "closed", then return a promise rejected with an
-      "InvalidStateError" DOMException.
-    </button>
-  </li>
-  <li><button onclick="done()">Done!</button></li>
-</ol>
-<small>
-  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
-  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
-</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method.https.html
index cc8349a4223..5627f337488 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-canmakepayment-method.https.html
@@ -7,6 +7,7 @@
 <script src="/resources/testdriver.js"></script>
 <script src='/resources/testdriver-vendor.js'></script>
 <script>
+"use strict";
 const basicCard = Object.freeze({ supportedMethods: "basic-card" });
 const applePay = Object.freeze({
   supportedMethods: "https://apple.com/apple-pay",
@@ -77,6 +78,40 @@ promise_test(async t => {
   ).canMakePayment();
   assert_true(await someSupported, `At least one method is expected to be supported.`);
 }, `Mix of supported and unsupported methods, at least one method is supported.`);
+
+promise_test(async t => {
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  const [acceptPromise, canMakePaymentPromise] = await test_driver.bless(
+    "show payment request",
+    () => {
+      const acceptPromise = request.show(); // Sets state to "interactive"
+      const canMakePaymentPromise = request.canMakePayment();
+      return [acceptPromise, canMakePaymentPromise];
+    });
+
+  await promise_rejects(t, "InvalidStateError", canMakePaymentPromise);
+  request.abort();
+  await promise_rejects(t, "AbortError", acceptPromise);
+
+  // The state should be "closed"
+  await promise_rejects(t, "InvalidStateError", request.canMakePayment());
+}, 'If request.[[state]] is "interactive", then return a promise rejected with an "InvalidStateError" DOMException.');
+
+promise_test(async t => {
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  const [abortPromise, acceptPromise] = await test_driver.bless(
+    "show payment request",
+    () => {
+      const acceptPromise = request.show(); // Sets state to "interactive"
+      acceptPromise.catch(() => {}); // no-op, just to silence unhandled rejection in devtools.
+      const abortPromise = request.abort();  // Sets state to "closed"
+      return [abortPromise, acceptPromise];
+    });
+
+  await abortPromise;
+  await promise_rejects(t, "AbortError", acceptPromise);
+  await promise_rejects(t, "InvalidStateError", request.canMakePayment());
+}, 'If request.[[state]] is "closed", then return a promise rejected with an "InvalidStateError" DOMException.');
 </script>
 
 <small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method-manual.https.html
index a4e8028c07f..e6b164f7cc7 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method-manual.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method-manual.https.html
@@ -57,45 +57,6 @@ function testHasEnrolledInstrumentAgain() {
     );
   }, `hasEnrolledInstrument() can be called multiple times if the payment method details are identical.`);
 }
-
-function testInteractiveState() {
-  promise_test(async t => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show();  // Sets state to "interactive"
-    const hasEnrolledInstrumentPromise = request.hasEnrolledInstrument();
-    try {
-      const result = await hasEnrolledInstrumentPromise;
-      assert_true(
-        false,
-        "hasEnrolledInstrument() should have thrown InvalidStateError"
-      );
-    } catch(err) {
-      await promise_rejects(t, "InvalidStateError", hasEnrolledInstrumentPromise);
-    } finally {
-      request.abort();
-      await promise_rejects(t, "AbortError", acceptPromise);
-    }
-  }, `If request.[[state]] is "interactive", then return a promise rejected with an "InvalidStateError" DOMException.`);
-}
-
-function testClosedState() {
-  promise_test(async t => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show();  // Sets state to "interactive"
-    acceptPromise.catch(() => {});  // no-op, just to handle unhandled rejection in devtools.
-    await request.abort();  // Sets state to "closed"
-    const hasEnrolledInstrumentPromise = request.hasEnrolledInstrument();
-    try {
-      const result = await hasEnrolledInstrumentPromise;
-      assert_true(
-        false,
-        "hasEnrolledInstrument() should have thrown InvalidStateError"
-      );
-    } catch(err) {
-      await promise_rejects(t, "InvalidStateError", hasEnrolledInstrumentPromise);
-    }
-  }, `If request.[[state]] is "closed", then return a promise rejected with an "InvalidStateError" DOMException.`);
-}
 </script>
 
 <h2>Manual tests for hasEnrolledInstrument() method</h2>
@@ -124,18 +85,6 @@ function testClosedState() {
       details are identical.
     </button>
   </li>
-  <li>
-    <button onclick="testInteractiveState()">
-      If request.[[state]] is "interactive", then return a promise rejected with
-      an "InvalidStateError" DOMException.
-    </button>
-  </li>
-  <li>
-    <button onclick="testClosedState()">
-      If request.[[state]] is "closed", then return a promise rejected with an
-      "InvalidStateError" DOMException.
-    </button>
-  </li>
   <li>
     <button onclick="done()">Done!</button>
   </li>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method.https.html
index c5139950d53..c1f7b27a22b 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-hasenrolledinstrument-method.https.html
@@ -7,10 +7,19 @@
 <script src="/resources/testdriver.js"></script>
 <script src='/resources/testdriver-vendor.js'></script>
 <script>
+"use strict";
 const unsupportedMethods = [
   { supportedMethods: "this-is-not-supported" },
   { supportedMethods: "https://not.supported" },
 ];
+const defaultMethods = Object.freeze([
+  {
+    supportedMethods: "basic-card",
+    data: {
+      supportedNetworks: [ 'visa' ],
+    },
+  }
+]);
 const defaultDetails = Object.freeze({
   total: {
     label: "Total",
@@ -25,9 +34,39 @@ promise_test(async t => {
   const request = new PaymentRequest(unsupportedMethods, defaultDetails);
   assert_false(
     await request.hasEnrolledInstrument(),
-    "Payment method is supported."
+    "hasEnrolledInstrument() should resolve to false."
   );
 }, `hasEnrolledInstrument() resolves to false for unsupported payment methods.`);
+
+promise_test(async t => {
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  const [acceptPromise, hasEnrolledInstrumentPromise] = await test_driver.bless(
+      "show payment request",
+      () => {
+        const acceptPromise = request.show();  // Sets state to "interactive"
+        const hasEnrolledInstrumentPromise = request.hasEnrolledInstrument();
+        return [acceptPromise, hasEnrolledInstrumentPromise];
+      });
+  await promise_rejects(t, "InvalidStateError", hasEnrolledInstrumentPromise);
+
+  await request.abort();
+  await promise_rejects(t, "AbortError", acceptPromise);
+}, `If request.[[state]] is "interactive", then return a promise rejected with an "InvalidStateError" DOMException.`);
+
+promise_test(async t => {
+  const request = new PaymentRequest(defaultMethods, defaultDetails);
+  const [abortPromise, acceptPromise] = await test_driver.bless( "show payment request", () => {
+    const acceptPromise = request.show();  // Sets state to "interactive"
+    acceptPromise.catch(() => {});  // no-op, just to handle unhandled rejection in devtools.
+    const abortPromise =request.abort();  // Sets state to "closed"
+    return [abortPromise, acceptPromise];
+  });
+  await abortPromise;
+  await promise_rejects(t, "AbortError", acceptPromise);
+
+  const hasEnrolledInstrumentPromise = request.hasEnrolledInstrument();
+  await promise_rejects(t, "InvalidStateError", hasEnrolledInstrumentPromise);
+}, `If request.[[state]] is "closed", then return a promise rejected with an "InvalidStateError" DOMException.`);
 </script>
 
 <small>
diff --git a/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active.https.html b/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active.https.html
index 06c1f7383a0..3c7e85ba970 100644
--- a/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active.https.html
@@ -1,12 +1,11 @@
 <!DOCTYPE html>
 <meta charset=utf-8>
-<link rel="help" href="https://w3c.github.io/payment-request/#show()-method">
 <title>PaymentRequest show() rejects if doc is not fully active</title>
+<link rel="help" href="https://w3c.github.io/payment-request/#show-method">
 <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>
-<link rel="help" href="https://w3c.github.io/payment-request/#dom-paymentrequest-show()">
 <body>
 <script>
 const applePay = Object.freeze({
@@ -50,94 +49,6 @@ function getLoadedPaymentRequest(iframe, url) {
   });
 }
 
-promise_test(async t => {
-  const iframe = document.createElement("iframe");
-  iframe.allowPaymentRequest = true;
-  document.body.appendChild(iframe);
-  // We first got to page1.html, grab a PaymentRequest instance.
-  const request1 = await getLoadedPaymentRequest(
-    iframe,
-    "/payment-request/resources/page1.html"
-  );
-  // We navigate the iframe again, putting request1's document into an inactive state.
-  const request2 = await getLoadedPaymentRequest(
-    iframe,
-    "/payment-request/resources/page2.html"
-  );
-  await test_driver.bless("show payment request", async () => {
-    // Now, request1's relevant global object's document is no longer active.
-    // So, call .show(), and make sure it rejects appropriately.
-    await promise_rejects(
-      t,
-      "AbortError",
-      request1.show(),
-      "Inactive document, so must throw AbortError"
-    );
-  });
-  await test_driver.bless("show payment request", async () => {
-    // request2 has an active document tho, so confirm it's working as expected:
-    request2.show();
-    await request2.abort();
-    await promise_rejects(
-      t,
-      "InvalidStateError",
-      request2.show(),
-      "Abort already called, so InvalidStateError"
-    );
-    // We are done, so clean up.
-    iframe.remove();
-  });
-}, "PaymentRequest.show() aborts if the document is not active");
-
-promise_test(async t => {
-  // We nest two iframes and wait for them to load.
-  const outerIframe = document.createElement("iframe");
-  outerIframe.allowPaymentRequest = true;
-  document.body.appendChild(outerIframe);
-  // Load the outer iframe (we don't care about the awaited request)
-  await getLoadedPaymentRequest(
-    outerIframe,
-    "/payment-request/resources/page1.html"
-  );
-
-  // Now we create the inner iframe
-  const innerIframe = outerIframe.contentDocument.createElement("iframe");
-  innerIframe.allowPaymentRequest = true;
-
-  // nest them
-  outerIframe.contentDocument.body.appendChild(innerIframe);
-
-  // load innerIframe, and get the PaymentRequest instance
-  const request = await getLoadedPaymentRequest(
-    innerIframe,
-    "/payment-request/resources/page2.html"
-  );
-
-  // Navigate the outer iframe to a new location.
-  // Wait for the load event to fire.
-  await new Promise(resolve => {
-    outerIframe.addEventListener("load", resolve);
-    outerIframe.src = "/payment-request/resources/page2.html";
-  });
-
-  const showPromise = await test_driver.bless("show payment request", () => {
-    return request.show();
-  });
-  // Now, request's relevant global object's document is still active
-  // (it is the active document of the inner iframe), but is not fully active
-  // (since the parent of the inner iframe is itself no longer active).
-  // So, call request.show() and make sure it rejects appropriately.
-  await promise_rejects(
-    t,
-    "AbortError",
-    showPromise,
-    "Active, but not fully active, so must throw AbortError"
-  );
-  // We are done, so clean up.
-
-  iframe.remove();
-}, "PaymentRequest.show() aborts if the document is active, but not fully active");
-
 promise_test(async t => {
   const iframe = document.createElement("iframe");
   iframe.allowPaymentRequest = true;
diff --git a/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active_manual.https.html b/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active_manual.https.html
new file mode 100644
index 00000000000..f1d2fb83e0e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/rejects_if_not_active_manual.https.html
@@ -0,0 +1,164 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>PaymentRequest show() rejects if doc is not fully active</title>
+<link rel="help" href="https://w3c.github.io/payment-request/#show-method">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+setup({
+  explicit_done: true,
+  explicit_timeout: true,
+});
+
+const applePay = Object.freeze({
+  supportedMethods: "https://apple.com/apple-pay",
+  data: {
+    version: 3,
+    merchantIdentifier: "merchant.com.example",
+    countryCode: "US",
+    merchantCapabilities: ["supports3DS"],
+    supportedNetworks: ["visa"],
+  }
+});
+const validMethod = Object.freeze({
+  supportedMethods: "basic-card",
+});
+const validMethods = Object.freeze([validMethod, applePay]);
+
+const validDetails = Object.freeze({
+  total: {
+    label: "Total due",
+      amount: {
+      currency: "USD",
+      value: "5.00",
+    },
+  },
+});
+
+function getLoadedPaymentRequest(iframe, url) {
+  return new Promise(resolve => {
+    iframe.addEventListener(
+      "load",
+      () => {
+        const { PaymentRequest } = iframe.contentWindow;
+        const request = new PaymentRequest(validMethods, validDetails);
+        resolve(request);
+      },
+      { once: true }
+    );
+    iframe.src = url;
+  });
+}
+
+function testAbortShowIfDocumentIsNotActive() {
+  promise_test(async t => {
+    const iframe = document.createElement("iframe");
+    iframe.allowPaymentRequest = true;
+    document.body.appendChild(iframe);
+    // We first got to page1.html, grab a PaymentRequest instance.
+    const request1 = await getLoadedPaymentRequest(
+      iframe,
+      "/payment-request/resources/page1.html"
+    );
+    // We navigate the iframe again, putting request1's document into an inactive state.
+    const request2 = await getLoadedPaymentRequest(
+      iframe,
+      "/payment-request/resources/page2.html"
+    );
+    // Now, request1's relevant global object's document is no longer active.
+    // So, call .show(), and make sure it rejects appropriately.
+    await promise_rejects(
+      t,
+      "AbortError",
+      request1.show(),
+      "Inactive document, so must throw AbortError"
+    );
+    // request2 has an active document tho, so confirm it's working as expected:
+    request2.show();
+    await request2.abort();
+    await promise_rejects(
+      t,
+      "InvalidStateError",
+      request2.show(),
+      "Abort already called, so InvalidStateError"
+    );
+    // We are done, so clean up.
+    iframe.remove();
+  }, "PaymentRequest.show() aborts if the document is not active.");
+}
+
+function testAbortShowIfDocumentIsNotFullyActive() {
+  promise_test(async t => {
+    // We nest two iframes and wait for them to load.
+    const outerIframe = document.createElement("iframe");
+    outerIframe.allowPaymentRequest = true;
+    document.body.appendChild(outerIframe);
+    // Load the outer iframe (we don't care about the awaited request)
+    await getLoadedPaymentRequest(
+      outerIframe,
+      "/payment-request/resources/page1.html"
+    );
+
+    // Now we create the inner iframe
+    const innerIframe = outerIframe.contentDocument.createElement("iframe");
+    innerIframe.allowPaymentRequest = true;
+
+    // nest them
+    outerIframe.contentDocument.body.appendChild(innerIframe);
+
+    // load innerIframe, and get the PaymentRequest instance
+    const request = await getLoadedPaymentRequest(
+      innerIframe,
+      "/payment-request/resources/page2.html"
+    );
+
+    // Navigate the outer iframe to a new location.
+    // Wait for the load event to fire.
+    await new Promise(resolve => {
+      outerIframe.addEventListener("load", resolve);
+      outerIframe.src = "/payment-request/resources/page2.html";
+    });
+
+    const showPromise = request.show();
+    // Now, request's relevant global object's document is still active
+    // (it is the active document of the inner iframe), but is not fully active
+    // (since the parent of the inner iframe is itself no longer active).
+    // So, call request.show() and make sure it rejects appropriately.
+    await promise_rejects(
+      t,
+      "AbortError",
+      showPromise,
+      "Active, but not fully active, so must throw AbortError"
+    );
+    // We are done, so clean up.
+
+    outerIframe.remove();
+  }, "PaymentRequest.show() aborts if the document is active, but not fully active.");
+}
+</script>
+
+<h2>PaymentRequest show() rejects if doc is not fully active</h2>
+<p>
+  Click on each button in sequence from top to bottom without refreshing the
+  page. Each button will bring up the Payment Request UI window and then will
+  close it automatically. (If a payment sheet stays open, the test has failed.)
+</p>
+<ol>
+  <li>
+    <button onclick="testAbortShowIfDocumentIsNotActive()">
+      PaymentRequest.show() aborts if the document is not active.
+    </button>
+  </li>
+  <li>
+    <button onclick="testAbortShowIfDocumentIsNotFullyActive()">
+      PaymentRequest.show() aborts if the document is active, but not fully
+      active.
+    </button>
+  </li>
+  <li><button onclick="done()">Done!</button></li>
+</ol>
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/picture-in-picture/disable-picture-in-picture.html b/tests/wpt/web-platform-tests/picture-in-picture/disable-picture-in-picture.html
index 31e0d12ad77..5075c011632 100644
--- a/tests/wpt/web-platform-tests/picture-in-picture/disable-picture-in-picture.html
+++ b/tests/wpt/web-platform-tests/picture-in-picture/disable-picture-in-picture.html
@@ -47,7 +47,9 @@ promise_test(async t => {
   return requestPictureInPictureWithTrustedClick(video)
   .then(() => {
     video.disablePictureInPicture = true;
-    assert_equals(document.pictureInPictureElement, null);
+    video.addEventListener('leavepictureinpicture', t.step_func(() => {
+      assert_equals(document.pictureInPictureElement, null);
+    }));
   });
 }, 'pictureInPictureElement is unset if disablePictureInPicture becomes true');
 
diff --git a/tests/wpt/web-platform-tests/screen-orientation/lock-basic.html b/tests/wpt/web-platform-tests/screen-orientation/lock-basic.html
index 5b30459bf7f..c42aba783e4 100644
--- a/tests/wpt/web-platform-tests/screen-orientation/lock-basic.html
+++ b/tests/wpt/web-platform-tests/screen-orientation/lock-basic.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
 <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>
 test(() => {
   screen.orientation.unlock();
@@ -12,11 +14,18 @@ test(() => {
 }, "Test that screen.orientation.unlock() returns a void value");
 
 promise_test(async t => {
+  await test_driver.bless("request full screen", () => {
+    return document.documentElement.requestFullscreen();
+  });
   const value = await screen.orientation.lock('any');
   assert_equals(value, undefined);
+  return document.exitFullscreen();
 }, "Test that screen.orientation.lock returns a promise which will be fulfilled with a void value.");
 
 promise_test(async t => {
+  await test_driver.bless("request full screen", () => {
+    return document.documentElement.requestFullscreen();
+  });
   const orientations = [
     'any',
     'natural',
@@ -50,9 +59,13 @@ promise_test(async t => {
     }
   }
   screen.orientation.unlock();
+  return document.exitFullscreen();
 }, "Test that screen.orientation.lock returns a pending promise.");
 
 promise_test(async t => {
+  await test_driver.bless("request full screen", () => {
+    return document.documentElement.requestFullscreen();
+  });
   const preType = screen.orientation.type;
   const isPortrait = preType.includes("portrait");
   const newType = `${ isPortrait ? "landscape" : "portrait" }-primary`;
@@ -60,5 +73,6 @@ promise_test(async t => {
   assert_equals(screen.orientation.type, preType, "Must not change orientation until next spin of event loop");
   await p;
   assert_equals(screen.orientation.type, newType);
+  return document.exitFullscreen();
 }, "Test that screen.orientation.lock() is actually async");
 </script>
diff --git a/tests/wpt/web-platform-tests/screen-orientation/onchange-event.html b/tests/wpt/web-platform-tests/screen-orientation/onchange-event.html
index 538fafc41ec..401af096631 100644
--- a/tests/wpt/web-platform-tests/screen-orientation/onchange-event.html
+++ b/tests/wpt/web-platform-tests/screen-orientation/onchange-event.html
@@ -3,13 +3,20 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
 promise_test(async t => {
+  await test_driver.bless("request full screen", () => {
+    return document.documentElement.requestFullscreen();
+  });
   const type = screen.orientation.type;
   screen.orientation.onchange = t.unreached_func("change event should not be fired");
   await screen.orientation.lock(type);
   assert_equals(screen.orientation.type, type);
+  return document.exitFullscreen();
 }, "Test that orientationchange event is not fired when the orientation does not change.");
 
 promise_test(async t => {
+  await test_driver.bless("request full screen", () => {
+    return document.documentElement.requestFullscreen();
+  });
   let orientations = [
     'portrait-primary',
     'portrait-secondary',
@@ -27,5 +34,6 @@ promise_test(async t => {
     assert_equals(screen.orientation.type, orientation);
   }
   screen.orientation.unlock();
+  return document.exitFullscreen();
 }, "Test that orientationchange event is fired when the orientation changes.");
 </script>
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html
index caa4f9445d3..83e5f4540d1 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html
@@ -141,12 +141,12 @@ function client_message_queue_enable_test(
     earliest_dispatch,
     description)
 {
-    function later_state(state1, state2) {
+    function assert_state_less_than_equal(state1, state2, explanation) {
         const states = ['init', 'install', 'start', 'finish', 'loaded'];
         const index1 = states.indexOf(state1);
         const index2 = states.indexOf(state2);
-        const max_index = Math.max(index1, index2);
-        return states[max_index];
+        if (index1 > index2)
+          assert_unreached(explanation);
     }
 
     client_message_queue_test('enable-client-message-queue.html', async t => {
@@ -161,12 +161,13 @@ function client_message_queue_enable_test(
 
         // Wait for all messages to get dispatched on the child's
         // ServiceWorkerContainer and then verify that each message
-        // was dispatched while the child was in the correct state.
+        // was dispatched after |earliest_dispatch|.
         const report = await t.frame.report;
         ['init', 'install', 'start'].forEach(state => {
-            const dispatch = later_state(state, earliest_dispatch);
-            assert_equals(report[state], dispatch,
-                          `Message sent in state '${state}' dispatched in state '${dispatch}'`);
+            const explanation = `Message sent in state '${state}' was dispatched in '${report[state]}', should be dispatched no earlier than '${earliest_dispatch}'`;
+            assert_state_less_than_equal(earliest_dispatch,
+                                         report[state],
+                                         explanation);
         });
     }, description);
 }
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh b/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
index 7c953940cb3..bb95df83295 100755
--- a/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
+++ b/tests/wpt/web-platform-tests/signed-exchange/resources/generate-test-sxgs.sh
@@ -272,4 +272,7 @@ gen-signedexchange \
   -miRecordSize 100 \
   -ignoreErrors true
 
+# Signed Exchange with payload integrity error.
+echo 'garbage' | cat sxg/sxg-location.sxg - >sxg/sxg-merkle-integrity-error.sxg
+
 rm -fr $tmpdir
diff --git a/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg b/tests/wpt/web-platform-tests/signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg
new file mode 100644
index 0000000000000000000000000000000000000000..0c6dce01da270bdacf5d280551d56d1519aff3a3
GIT binary patch
literal 999
zcmb7COKTHR6iyKovJ?>)F2*YKIgd;-Hm^xZ<D^NNq-m41X<f+8%+1U+^Xk1f&BW4$
zAQVA#;~%gHx_040a3lBws%sHJS1yVRMcn9}rjfc5@4)5Ex##=N`92Qz^$6RJhC=fO
zAs$Zhd_<h%1o}mi@mMUzV^epa#zJ2;fTKemLG1RB3Nddw4n%AZS)4&^D>QZx3O%ww
z8(Jxbg5>Fn(##cCa+^z9F`H8&jrd}r>erjuf!IYc32rSdXM5FBq(6uAdSe4?)ofAE
zZfp4kyS%0?3`$DW^`$7lnzY@Fml89j?Lm`YuGGY`Tdzs3Je^{8fMseX83a?v<NvK-
zq=g&ta5mP*Q;g{ls3XcNk87q5G2v~K#Rd?i>#Pu^1u8`3@1A|wW<3j#j*D!LP{_aB
z`(rbQeVy~5&8ck{jkt%+<Y}+oO!QhEO|sTkt?s5ha~m3<?6*4W#zMOYON+I9cBe9v
zF!DI?LjwfL5lIxKm=G6)6a#(Fq$-14G!m1p3&NB9P*N*#T9YgQ%bRnQqMC0G?0&+p
z@VPa;Unp#ma?|Q6#j3voV%3$_YN0DHCNTk|hjXGJlvS6S<q(z(JlMKKpilT<9jHeJ
zKo}CaM>=f0HY$UT>T0H=mrr*O4Ud+-a$`By*r+K?K#>WjiAgM&$qidDZilHKZ)2g+
zs3|84ndXN@;WSo}>5)vhZ#tUW=YXauJ9M(LiRpk4O-|SlV{q-o^P|Ia?%|u=$ioYl
z$G(5K|M}T@KmU4u>gvnK4>E=hCuW&R7$Bz@Im7IR8Rqzpqvit6a}l8zCY69phm*m3
za4c5^#B`k`qq%C&rf_bQ;tT{kvnO>lgdg8di)Vi^Ki?hQOWe75@bsIQeZPPA=9m3f
zpQ6gwGd~c5=oC)?2~r~p6W{6p%W4C)n`CH&;oej#yf-_HX_)3mUg!X|>6GE$QRP*A

literal 0
HcmV?d00001

diff --git a/tests/wpt/web-platform-tests/signed-exchange/sxg-merkle-integrity-error.tentative.html b/tests/wpt/web-platform-tests/signed-exchange/sxg-merkle-integrity-error.tentative.html
new file mode 100644
index 00000000000..5f923d20542
--- /dev/null
+++ b/tests/wpt/web-platform-tests/signed-exchange/sxg-merkle-integrity-error.tentative.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>SignedHTTPExchange with payload integrity error</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="./resources/sxg-util.js"></script>
+<body>
+<script>
+promise_test(async (t) => {
+  try {
+    const sxgUrl = get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg';
+    const message = await openSXGInIframeAndWaitForMessage(t, sxgUrl);
+    if (message.is_fallback) {
+        assert_unreached('Fallback redirect should not have happened');
+    } else {
+        assert_unreached('SXG should not have loaded');
+    }
+  } catch (e) {
+    assert_equals(e, 'timeout');
+  }
+}, "SignedHTTPExchange with payload integrity error");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html b/tests/wpt/web-platform-tests/signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html
new file mode 100644
index 00000000000..2086c38545d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/signed-exchange/sxg-prefetch-merkle-integrity-error.tentative.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<title>Prefetching SignedHTTPExchange with payload integrity error should fail</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="./resources/sxg-util.js"></script>
+<body>
+<script>
+promise_test(async (t) => {
+  const sxgUrl = get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg/sxg-merkle-integrity-error.sxg';
+  await new Promise(resolve => {
+    const link = document.createElement('link');
+    link.rel = 'prefetch';
+    link.href = sxgUrl;
+    link.addEventListener('error', t.step_func(() => {
+        resolve();
+    }));
+    link.addEventListener('load', t.step_func(() => {
+        assert_unreached('Prefetch should fail');
+    }));
+    document.body.appendChild(link);
+  });
+}, "Prefetching SignedHTTPExchange with payload integrity error should fail");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/tools/wpt/browser.py b/tests/wpt/web-platform-tests/tools/wpt/browser.py
index 5f711f47580..c4469800608 100644
--- a/tests/wpt/web-platform-tests/tools/wpt/browser.py
+++ b/tests/wpt/web-platform-tests/tools/wpt/browser.py
@@ -469,7 +469,7 @@ class Chrome(Browser):
                 return None
             m = re.match(r"Google Chrome (.*)", version_string)
             if not m:
-                self.logger.warning("Failed to extract version from: s%", version_string)
+                self.logger.warning("Failed to extract version from: %s", version_string)
                 return None
             return m.group(1)
         self.logger.warning("Unable to extract version from binary on Windows.")
@@ -667,7 +667,7 @@ class Safari(Browser):
             return None
         m = re.match(r"Included with Safari (.*)", version_string)
         if not m:
-            self.logger.warning("Failed to extract version from: s%", version_string)
+            self.logger.warning("Failed to extract version from: %s", version_string)
             return None
         return m.group(1)
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index 1b4c0b93cbe..5791cdae957 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -511,12 +511,13 @@ class MarionetteProtocol(Protocol):
         pass
 
     def teardown(self):
-        try:
-            self.marionette._request_in_app_shutdown()
-            self.marionette.delete_session(send_request=False)
-        except Exception:
-            # This is typically because the session never started
-            pass
+        if self.marionette and self.marionette.session_id:
+            try:
+                self.marionette._request_in_app_shutdown()
+                self.marionette.delete_session(send_request=False)
+            except Exception:
+                # This is typically because the session never started
+                pass
         if self.marionette is not None:
             del self.marionette
         super(MarionetteProtocol, self).teardown()
@@ -769,9 +770,10 @@ class MarionetteRefTestExecutor(RefTestExecutor):
     def teardown(self):
         try:
             self.implementation.teardown()
-            handles = self.protocol.marionette.window_handles
-            if handles:
-                self.protocol.marionette.switch_to_window(handles[0])
+            if self.protocol.marionette and self.protocol.marionette.session_id:
+                handles = self.protocol.marionette.window_handles
+                if handles:
+                    self.protocol.marionette.switch_to_window(handles[0])
             super(self.__class__, self).teardown()
         except Exception as e:
             # Ignore errors during teardown
@@ -877,8 +879,9 @@ class InternalRefTestImplementation(object):
 
     def teardown(self):
         try:
-            self.executor.protocol.marionette._send_message("reftest:teardown", {})
-            self.executor.protocol.marionette.set_context(self.executor.protocol.marionette.CONTEXT_CONTENT)
+            if self.executor.protocol.marionette and self.executor.protocol.marionette.session_id:
+                self.executor.protocol.marionette._send_message("reftest:teardown", {})
+                self.executor.protocol.marionette.set_context(self.executor.protocol.marionette.CONTEXT_CONTENT)
         except Exception as e:
             # Ignore errors during teardown
             self.logger.warning(traceback.format_exc(e))
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
index 74a7cc4b7fc..aa3565e5726 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/protocol.py
@@ -54,18 +54,11 @@ class Protocol(object):
 
             msg = "Post-connection steps failed"
             self.after_connect()
-        except IOError:
-            self.logger.warning("Timed out waiting for browser to start")
-            self.executor.runner.send_message("init_failed")
-            return
         except Exception:
             if msg is not None:
                 self.logger.warning(msg)
-            self.logger.error(traceback.format_exc())
-            self.executor.runner.send_message("init_failed")
-            return
-        else:
-            self.executor.runner.send_message("init_succeeded")
+            self.logger.warning(traceback.format_exc())
+            raise
 
     @abstractmethod
     def connect(self):
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
index d3a62646278..05b3190a5f4 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
@@ -70,7 +70,13 @@ class TestRunner(object):
 
     def setup(self):
         self.logger.debug("Executor setup")
-        self.executor.setup(self)
+        try:
+            self.executor.setup(self)
+        except Exception:
+            # The caller is responsible for logging the exception if required
+            self.send_message("init_failed")
+        else:
+            self.send_message("init_succeeded")
         self.logger.debug("Executor setup done")
 
     def teardown(self):