diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 064dbc83dc9..7457d8bccb8 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -104065,6 +104065,18 @@
      {}
     ]
    ], 
+   "css/css-backgrounds/background-size/background-size-cover-svg.html": [
+    [
+     "/css/css-backgrounds/background-size/background-size-cover-svg.html", 
+     [
+      [
+       "/css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "css/css-backgrounds/background-size/background-size-cover.xht": [
     [
      "/css/css-backgrounds/background-size/background-size-cover.xht", 
@@ -128085,6 +128097,18 @@
      {}
     ]
    ], 
+   "css/css-multicol/multicol-span-all-005.html": [
+    [
+     "/css/css-multicol/multicol-span-all-005.html", 
+     [
+      [
+       "/css/css-multicol/multicol-span-all-005-ref.html", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "css/css-multicol/multicol-span-all-block-sibling-003.xht": [
     [
      "/css/css-multicol/multicol-span-all-block-sibling-003.xht", 
@@ -141433,6 +141457,18 @@
      {}
     ]
    ], 
+   "css/css-text/white-space/pre-float-001.html": [
+    [
+     "/css/css-text/white-space/pre-float-001.html", 
+     [
+      [
+       "/css/css-text/white-space/reference/pre-float-001-ref.html", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "css/css-text/white-space/pre-wrap-001.html": [
     [
      "/css/css-text/white-space/pre-wrap-001.html", 
@@ -141577,6 +141613,18 @@
      {}
     ]
    ], 
+   "css/css-text/white-space/pre-wrap-float-001.html": [
+    [
+     "/css/css-text/white-space/pre-wrap-float-001.html", 
+     [
+      [
+       "/css/css-text/white-space/reference/pre-wrap-float-001-ref.html", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "css/css-text/white-space/tab-stop-threshold-001.html": [
     [
      "/css/css-text/white-space/tab-stop-threshold-001.html", 
@@ -169017,6 +169065,18 @@
      {}
     ]
    ], 
+   "css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html": [
+    [
+     "/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html", 
+     [
+      [
+       "/css/filter-effects/reference/green-100x100.html", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "css/filter-effects/svg-unknown-input-001.html": [
     [
      "/css/filter-effects/svg-unknown-input-001.html", 
@@ -192481,6 +192541,18 @@
      {}
     ]
    ], 
+   "svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg": [
+    [
+     "/svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg", 
+     [
+      [
+       "/svg/pservers/reftests/reference/green-100x100.svg", 
+       "=="
+      ]
+     ], 
+     {}
+    ]
+   ], 
    "svg/render/reftests/blending-001.svg": [
     [
      "/svg/render/reftests/blending-001.svg", 
@@ -250621,6 +250693,11 @@
      {}
     ]
    ], 
+   "css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html": [
+    [
+     {}
+    ]
+   ], 
    "css/css-backgrounds/background-size/reference/background-size-cover.xht": [
     [
      {}
@@ -250641,6 +250718,11 @@
      {}
     ]
    ], 
+   "css/css-backgrounds/background-size/support/rectangle-2560x208.svg": [
+    [
+     {}
+    ]
+   ], 
    "css/css-backgrounds/background-size/support/rectangle-96x60.png": [
     [
      {}
@@ -264171,6 +264253,11 @@
      {}
     ]
    ], 
+   "css/css-multicol/multicol-span-all-005-ref.html": [
+    [
+     {}
+    ]
+   ], 
    "css/css-multicol/multicol-span-all-block-sibling-3-ref.xht": [
     [
      {}
@@ -269681,11 +269768,21 @@
      {}
     ]
    ], 
+   "css/css-text/white-space/reference/pre-float-001-ref.html": [
+    [
+     {}
+    ]
+   ], 
    "css/css-text/white-space/reference/pre-wrap-001-ref.html": [
     [
      {}
     ]
    ], 
+   "css/css-text/white-space/reference/pre-wrap-float-001-ref.html": [
+    [
+     {}
+    ]
+   ], 
    "css/css-text/white-space/reference/tab-stop-threshold-001-ref.html": [
     [
      {}
@@ -276441,6 +276538,11 @@
      {}
     ]
    ], 
+   "css/cssom/support/constructable-import.css": [
+    [
+     {}
+    ]
+   ], 
    "css/cssom/support/getComputedStyle-insets.js": [
     [
      {}
@@ -276851,6 +276953,11 @@
      {}
     ]
    ], 
+   "css/filter-effects/reference/green-100x100.html": [
+    [
+     {}
+    ]
+   ], 
    "css/filter-effects/reference/svg-feflood-ref.html": [
     [
      {}
@@ -308546,6 +308653,11 @@
      {}
     ]
    ], 
+   "service-workers/service-worker/resources/import-relative.xsl": [
+    [
+     {}
+    ]
+   ], 
    "service-workers/service-worker/resources/import-scripts-echo.py": [
     [
      {}
@@ -309336,6 +309448,21 @@
      {}
     ]
    ], 
+   "service-workers/service-worker/resources/xsl-base-url-iframe.xml": [
+    [
+     {}
+    ]
+   ], 
+   "service-workers/service-worker/resources/xsl-base-url-worker.js": [
+    [
+     {}
+    ]
+   ], 
+   "service-workers/service-worker/resources/xslt-pass.xsl": [
+    [
+     {}
+    ]
+   ], 
    "service-workers/specgen.json": [
     [
      {}
@@ -310266,6 +310393,11 @@
      {}
     ]
    ], 
+   "svg/pservers/reftests/reference/green-100x100.svg": [
+    [
+     {}
+    ]
+   ], 
    "svg/render/reftests/blending-001-ref.svg": [
     [
      {}
@@ -338085,6 +338217,12 @@
      }
     ]
    ], 
+   "css/css-animations/computed-style-animation-parsing.html": [
+    [
+     "/css/css-animations/computed-style-animation-parsing.html", 
+     {}
+    ]
+   ], 
    "css/css-animations/event-dispatch.tentative.html": [
     [
      "/css/css-animations/event-dispatch.tentative.html", 
@@ -338253,6 +338391,12 @@
      {}
     ]
    ], 
+   "css/css-animations/style-animation-parsing.html": [
+    [
+     "/css/css-animations/style-animation-parsing.html", 
+     {}
+    ]
+   ], 
    "css/css-backgrounds/background-331.html": [
     [
      "/css/css-backgrounds/background-331.html", 
@@ -342655,6 +342799,12 @@
      {}
     ]
    ], 
+   "css/css-scoping/slotted-nested.html": [
+    [
+     "/css/css-scoping/slotted-nested.html", 
+     {}
+    ]
+   ], 
    "css/css-scoping/slotted-parsing.html": [
     [
      "/css/css-scoping/slotted-parsing.html", 
@@ -345733,6 +345883,12 @@
      {}
     ]
    ], 
+   "css/css-transitions/transition-reparented.html": [
+    [
+     "/css/css-transitions/transition-reparented.html", 
+     {}
+    ]
+   ], 
    "css/css-transitions/transition-timing-function-001.html": [
     [
      "/css/css-transitions/transition-timing-function-001.html", 
@@ -349369,6 +349525,12 @@
      {}
     ]
    ], 
+   "css/cssom/CSSStyleSheet-constructable.html": [
+    [
+     "/css/cssom/CSSStyleSheet-constructable.html", 
+     {}
+    ]
+   ], 
    "css/cssom/CSSStyleSheet.html": [
     [
      "/css/cssom/CSSStyleSheet.html", 
@@ -376925,6 +377087,12 @@
      {}
     ]
    ], 
+   "html/syntax/parsing/quotes-in-meta.html": [
+    [
+     "/html/syntax/parsing/quotes-in-meta.html", 
+     {}
+    ]
+   ], 
    "html/syntax/parsing/template/additions-to-foster-parenting/template-is-a-foster-parent-element.html": [
     [
      "/html/syntax/parsing/template/additions-to-foster-parenting/template-is-a-foster-parent-element.html", 
@@ -406871,6 +407039,12 @@
      {}
     ]
    ], 
+   "service-workers/service-worker/xsl-base-url.https.html": [
+    [
+     "/service-workers/service-worker/xsl-base-url.https.html", 
+     {}
+    ]
+   ], 
    "shadow-dom/Document-prototype-adoptNode.html": [
     [
      "/shadow-dom/Document-prototype-adoptNode.html", 
@@ -408847,6 +409021,12 @@
      {}
     ]
    ], 
+   "svg/geometry/parsing/height-computed.svg": [
+    [
+     "/svg/geometry/parsing/height-computed.svg", 
+     {}
+    ]
+   ], 
    "svg/geometry/parsing/r-computed.svg": [
     [
      "/svg/geometry/parsing/r-computed.svg", 
@@ -408901,6 +409081,12 @@
      {}
     ]
    ], 
+   "svg/geometry/parsing/width-computed.svg": [
+    [
+     "/svg/geometry/parsing/width-computed.svg", 
+     {}
+    ]
+   ], 
    "svg/geometry/parsing/x-computed.svg": [
     [
      "/svg/geometry/parsing/x-computed.svg", 
@@ -409477,6 +409663,12 @@
      {}
     ]
    ], 
+   "svg/pservers/parsing/stop-color-computed.svg": [
+    [
+     "/svg/pservers/parsing/stop-color-computed.svg", 
+     {}
+    ]
+   ], 
    "svg/pservers/parsing/stop-opacity-computed.svg": [
     [
      "/svg/pservers/parsing/stop-opacity-computed.svg", 
@@ -409495,6 +409687,12 @@
      {}
     ]
    ], 
+   "svg/pservers/scripted/stop-color-inheritance-currentcolor.svg": [
+    [
+     "/svg/pservers/scripted/stop-color-inheritance-currentcolor.svg", 
+     {}
+    ]
+   ], 
    "svg/scripted/text-attrs-dxdy-have-length.svg": [
     [
      "/svg/scripted/text-attrs-dxdy-have-length.svg", 
@@ -410639,9 +410837,9 @@
      {}
     ]
    ], 
-   "user-timing/mark-measure-return-null.html": [
+   "user-timing/mark-measure-feature-detection.html": [
     [
-     "/user-timing/mark-measure-return-null.html", 
+     "/user-timing/mark-measure-feature-detection.html", 
      {}
     ]
    ], 
@@ -537162,6 +537360,10 @@
    "4ca5eb736e76274eee9883121970fee0ab8280ca", 
    "manual"
   ], 
+  "css/css-animations/computed-style-animation-parsing.html": [
+   "15a1665be5ee13c66c434f6da48af42ac622baff", 
+   "testharness"
+  ], 
   "css/css-animations/event-dispatch.tentative.html": [
    "54bc9499a535dba81f302e4c40eb20193bee0da6", 
    "testharness"
@@ -537274,6 +537476,10 @@
    "fb74d7fa7d062d60153d47913df9eb2b0c7267c8", 
    "testharness"
   ], 
+  "css/css-animations/style-animation-parsing.html": [
+   "792fda33ed8b0bacf355e62066ec05d54cc5c729", 
+   "testharness"
+  ], 
   "css/css-animations/support/testcommon.js": [
    "b4fde4b967de2eb67cb3e0819c3a896375e861f9", 
    "support"
@@ -538022,6 +538228,10 @@
    "d168e154fb34fea05c6c05a201b030099d5cdf01", 
    "reftest"
   ], 
+  "css/css-backgrounds/background-size/background-size-cover-svg.html": [
+   "5e33c75afcec1ecd8b393a753ae97703d4728bf2", 
+   "reftest"
+  ], 
   "css/css-backgrounds/background-size/background-size-cover.xht": [
    "c88e7fd2ed34aa61f24fde1a8d424155d430fc37", 
    "reftest"
@@ -538030,6 +538240,10 @@
    "62e1ed65f4f5acebdf2d6594178c16168f5cc74a", 
    "support"
   ], 
+  "css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html": [
+   "b6dd172aa6624a5dec591d5b37294bb432c168c1", 
+   "support"
+  ], 
   "css/css-backgrounds/background-size/reference/background-size-cover.xht": [
    "29ac66132d7539ca6d897c3e69a206a91ac0d23a", 
    "support"
@@ -538046,6 +538260,10 @@
    "6c1406b7dfd7c59f413a183c8896b8c2b3395bf5", 
    "support"
   ], 
+  "css/css-backgrounds/background-size/support/rectangle-2560x208.svg": [
+   "578dd86ae055e0eab3ce57ad003481dfa000fd2c", 
+   "support"
+  ], 
   "css/css-backgrounds/background-size/support/rectangle-96x60.png": [
    "add0d272b1eb56d0003d414c6e04f080053b62a4", 
    "support"
@@ -561306,6 +561524,14 @@
    "e9165658c11fea62e4f714fc4643f33853e95500", 
    "reftest"
   ], 
+  "css/css-multicol/multicol-span-all-005-ref.html": [
+   "641fbb9dcf5e093ab0892aba918c05965c9f23e1", 
+   "support"
+  ], 
+  "css/css-multicol/multicol-span-all-005.html": [
+   "249b69b7107e3ee65cf52986af0f298e18ea743e", 
+   "reftest"
+  ], 
   "css/css-multicol/multicol-span-all-block-sibling-003.xht": [
    "bd2cdd6cdab0fc15c2e16e2237f6b025230332c4", 
    "reftest"
@@ -566018,6 +566244,10 @@
    "c06c96143ba0d478940fb54208d241adb4f6ee8b", 
    "testharness"
   ], 
+  "css/css-scoping/slotted-nested.html": [
+   "c7139fea4c280585197db5bd432931bcf53c2e53", 
+   "testharness"
+  ], 
   "css/css-scoping/slotted-parsing.html": [
    "6888693bbf40932d62a19b535adba22adbd43b19", 
    "testharness"
@@ -572986,6 +573216,10 @@
    "f3dbf4609f44e537328a741bd03059c09a38af45", 
    "reftest"
   ], 
+  "css/css-text/white-space/pre-float-001.html": [
+   "4d9f8bba4d50964544dff35c8d2049d2f6ea8e27", 
+   "reftest"
+  ], 
   "css/css-text/white-space/pre-wrap-001.html": [
    "31486f8f77c4c77188d94e9c21e9a8d5003e1bc4", 
    "reftest"
@@ -573034,6 +573268,10 @@
    "f9063c98767e70c3899bc9a59b50b42a61240ae4", 
    "reftest"
   ], 
+  "css/css-text/white-space/pre-wrap-float-001.html": [
+   "6ef0faa0cf8e22ddea43dcd06ce3f9e5edf9cfd6", 
+   "reftest"
+  ], 
   "css/css-text/white-space/reference/control-chars-000-ref.html": [
    "9d5fcb27147a8c53e410d08511cb5035b612f80c", 
    "support"
@@ -573046,10 +573284,18 @@
    "ea1faa2ed1f7af05f932167762f85fc2e5150884", 
    "support"
   ], 
+  "css/css-text/white-space/reference/pre-float-001-ref.html": [
+   "b05c008bed1fe69bbe968c16604d582434907c44", 
+   "support"
+  ], 
   "css/css-text/white-space/reference/pre-wrap-001-ref.html": [
    "8a8b5132db197bb9a76b1b44e461405f4cd9d1bc", 
    "support"
   ], 
+  "css/css-text/white-space/reference/pre-wrap-float-001-ref.html": [
+   "09ca86dd699186162137d4090ba2bfa3e930389e", 
+   "support"
+  ], 
   "css/css-text/white-space/reference/tab-stop-threshold-001-ref.html": [
    "5694dd2f526176b1a662f5e06c2b1d97cff425df", 
    "support"
@@ -579714,6 +579960,10 @@
    "3fa82c16d1f9e7f01760003c07bdfbc38afa060d", 
    "manual"
   ], 
+  "css/css-transitions/transition-reparented.html": [
+   "3dfd19425fcaa76051618113bfb4793baf06f364", 
+   "testharness"
+  ], 
   "css/css-transitions/transition-test.html": [
    "10700abf9bc48d0938fd3f5b77b031ecc0c05e4a", 
    "reftest"
@@ -591638,6 +591888,10 @@
    "3acdfb12852356ac28e91af25c82052d45864b0e", 
    "testharness"
   ], 
+  "css/cssom/CSSStyleSheet-constructable.html": [
+   "7df1820c0437edbe0edfe4d7bb25c02f832dd3bc", 
+   "testharness"
+  ], 
   "css/cssom/CSSStyleSheet.html": [
    "86016ef5a3db6636bf97edc58992f30f909c13a2", 
    "testharness"
@@ -592030,6 +592284,10 @@
    "85dd7324815b8f8ef1a1d0496224c1a0661db9d8", 
    "support"
   ], 
+  "css/cssom/support/constructable-import.css": [
+   "d8ccc9d491b65c54bc990066d8292eba8a6d5461", 
+   "support"
+  ], 
   "css/cssom/support/getComputedStyle-insets.js": [
    "beec32e76bc5fcef4640193e321805975c8554b9", 
    "support"
@@ -592666,6 +592924,10 @@
    "cfd8029223165871c4e2d78bee4a221b54822957", 
    "support"
   ], 
+  "css/filter-effects/reference/green-100x100.html": [
+   "f718ea6abfbab54333ba674ff0dcd320d8672bcd", 
+   "support"
+  ], 
   "css/filter-effects/reference/svg-feflood-ref.html": [
    "5623b08ecd71b292e698ee249a79b59d0046300f", 
    "support"
@@ -592870,6 +593132,10 @@
    "3d8118b387d938b588e8e88ad5ec87a5343e4f72", 
    "reftest"
   ], 
+  "css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html": [
+   "e3be6544dc803ba7d9c69e9a1d906296c2c15301", 
+   "reftest"
+  ], 
   "css/filter-effects/svg-unknown-input-001.html": [
    "7789f2a9af4f1492fa6db36b53a72ada151f61d5", 
    "reftest"
@@ -593403,7 +593669,7 @@
    "reftest"
   ], 
   "css/selectors/attribute-selectors/attribute-case/cssom.html": [
-   "d03d820a3e6ed93b217558de2c3b91c040b22dd7", 
+   "74e7b9645f89423c628914cd3f246728de8ac71f", 
    "testharness"
   ], 
   "css/selectors/attribute-selectors/attribute-case/resources/semantics-quirks.html": [
@@ -610855,7 +611121,7 @@
    "testharness"
   ], 
   "fetch/api/headers/headers-no-cors.window.js": [
-   "ebf0142e280c668ac2adf5205e7e26712598e203", 
+   "9ea76e03e138f1604053771bb1a75130758726f7", 
    "testharness"
   ], 
   "fetch/api/headers/headers-normalize.html": [
@@ -630518,6 +630784,10 @@
    "d09915cd974dd3a8b828eb58c004d63c853d1271", 
    "testharness"
   ], 
+  "html/syntax/parsing/quotes-in-meta.html": [
+   "3d1eaf02a20c7dad80656f69adb26e24e1b1647f", 
+   "testharness"
+  ], 
   "html/syntax/parsing/template.js": [
    "b249fb64c71c16f1b6cefcc59668699f769a2341", 
    "support"
@@ -633179,7 +633449,7 @@
    "support"
   ], 
   "interfaces/webrtc-stats.idl": [
-   "b2bf38e9fd45f81598bbdef1daef789cbdd75977", 
+   "cf07738b8b45c808a80895356699a5e04967e25e", 
    "support"
   ], 
   "interfaces/webrtc.idl": [
@@ -656255,7 +656525,7 @@
    "support"
   ], 
   "resource-timing/single-entry-per-resource.html": [
-   "39d7d5b256616d6b1d8a93c2c188412746791355", 
+   "1f8f4005e42c61ebb0dc0cae549429b29c68bd97", 
    "testharness"
   ], 
   "resource-timing/supported_resource_type.any.js": [
@@ -660310,6 +660580,10 @@
    "aa885e7a4de04820822eb562d47780999fa253e4", 
    "support"
   ], 
+  "service-workers/service-worker/resources/import-relative.xsl": [
+   "063a62d03143a32f44365bf1e7b08d283ae52895", 
+   "support"
+  ], 
   "service-workers/service-worker/resources/import-scripts-echo.py": [
    "7d92794e31b6b1270db26779f63644ac42a3d3d6", 
    "support"
@@ -660942,6 +661216,18 @@
    "e388e461448f64d37d747b26830f4e869a2c6528", 
    "support"
   ], 
+  "service-workers/service-worker/resources/xsl-base-url-iframe.xml": [
+   "065a07acb284821dde1cbea8680781a524f21bc2", 
+   "support"
+  ], 
+  "service-workers/service-worker/resources/xsl-base-url-worker.js": [
+   "50e2b1842ffc7f2ef2017846406eb67ed9491ead", 
+   "support"
+  ], 
+  "service-workers/service-worker/resources/xslt-pass.xsl": [
+   "2cd7f2f8f86a23d464b30feab0939931134810cc", 
+   "support"
+  ], 
   "service-workers/service-worker/respond-with-body-accessed-response.https.html": [
    "f6713d89216ec0a8e5cfc6f4cbb326f0bd6e672e", 
    "testharness"
@@ -661114,6 +661400,10 @@
    "f9ba656b5178359f2c7b6e2419a57ff12ec79d23", 
    "testharness"
   ], 
+  "service-workers/service-worker/xsl-base-url.https.html": [
+   "1d3c36408a66a7785b884c9cdc39dcd2820f9af0", 
+   "testharness"
+  ], 
   "service-workers/specgen.json": [
    "88c36ed04aada9b61dfe65f97dc6e73d7913a6a9", 
    "support"
@@ -662587,7 +662877,7 @@
    "reftest"
   ], 
   "svg/extensibility/foreignObject/properties.svg": [
-   "b92a6d1d15bcfa61da6ead3eeaba5122d9c2be76", 
+   "dd198f177dfb2906ce6be9184df9fbbb8feefe93", 
    "testharness"
   ], 
   "svg/extensibility/foreignObject/stacking-context-ref.html": [
@@ -662630,6 +662920,10 @@
    "022445662b7d9d519ca28a1eeca47c9199ceafca", 
    "testharness"
   ], 
+  "svg/geometry/parsing/height-computed.svg": [
+   "bcc1f9d0e11ab8e223a2aa238ac448273f93ea08", 
+   "testharness"
+  ], 
   "svg/geometry/parsing/r-computed.svg": [
    "b0f6bb0f671267c4895413ff749f8a7a96f2cb5a", 
    "testharness"
@@ -662666,6 +662960,10 @@
    "e92e2cf6410ba4071baa81c18ec4462ba60b42dd", 
    "testharness"
   ], 
+  "svg/geometry/parsing/width-computed.svg": [
+   "1af3de12347af146aad2cff7447a753942beaf60", 
+   "testharness"
+  ], 
   "svg/geometry/parsing/x-computed.svg": [
    "9355ea3ae95767b9cee92d49b4f1d1809e2edc06", 
    "testharness"
@@ -665554,6 +665852,10 @@
    "297f8ede687a28a12ced98a4b89051dd9ddf5090", 
    "testharness"
   ], 
+  "svg/pservers/parsing/stop-color-computed.svg": [
+   "b05a69f10b9e3614f7a588998ea06879df437da7", 
+   "testharness"
+  ], 
   "svg/pservers/parsing/stop-opacity-computed.svg": [
    "cb0f8295ce4777a91c26c66995a2b11c5d03b43c", 
    "testharness"
@@ -665630,6 +665932,18 @@
    "04d8d3025ee0f039a05bdd439f2dc02c13f49a23", 
    "reftest"
   ], 
+  "svg/pservers/reftests/reference/green-100x100.svg": [
+   "120941444a4898197d6b6001f9908a6cd48b62ba", 
+   "support"
+  ], 
+  "svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg": [
+   "da0a05dd879cc9358535002ea4737cdbdaef45f2", 
+   "reftest"
+  ], 
+  "svg/pservers/scripted/stop-color-inheritance-currentcolor.svg": [
+   "22bf513c862bf8d1ccbac358c71560fd834e545a", 
+   "testharness"
+  ], 
   "svg/render/reftests/blending-001-ref.svg": [
    "dcd39a8a1d5b2c76038a50506e661d3c5513a847", 
    "support"
@@ -671319,7 +671633,7 @@
    "support"
   ], 
   "tools/wptrunner/requirements_sauce.txt": [
-   "666db37ac1a4822250ee1dcdbf3c23e672a154e3", 
+   "e38f4dea67038c44f64b5e9696c3484f117ed849", 
    "support"
   ], 
   "tools/wptrunner/requirements_servo.txt": [
@@ -671459,7 +671773,7 @@
    "support"
   ], 
   "tools/wptrunner/wptrunner/browsers/base.py": [
-   "712ff3fbc9b30dfcd4b0719391bc80ee5eb22340", 
+   "6413753929100c5042e2ab8191a616372e8fd6d3", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/browsers/chrome.py": [
@@ -671483,7 +671797,7 @@
    "support"
   ], 
   "tools/wptrunner/wptrunner/browsers/firefox.py": [
-   "618f011abaf40a9d7fe42b34106e44326388076b", 
+   "14cac17cf6d292de5f48c4bfa556ef1c30853011", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/browsers/ie.py": [
@@ -671599,11 +671913,11 @@
    "support"
   ], 
   "tools/wptrunner/wptrunner/executors/reftest-wait_marionette.js": [
-   "61f894f8760bc623c8953e0eb7f0c3e01d5f72e4", 
+   "194e192c2f4e22021781f633841a33eae9925417", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/executors/reftest-wait_webdriver.js": [
-   "c1cc649e323f9742396b73e301ff306271b160d3", 
+   "a7486b6594d96093ae2267c48ca0b87ab40ef7cc", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/executors/reftest.js": [
@@ -671679,15 +671993,15 @@
    "support"
   ], 
   "tools/wptrunner/wptrunner/testharnessreport.js": [
-   "281f97ddaa6673333056e35c3e2f3adb804e100c", 
+   "29fc0e9873188223ac3783a8c622bbbe21ec5af5", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/testloader.py": [
-   "a395a50a45c427262d604223dfd341f2a6e5892b", 
+   "f8849ebe75e6c5a2370ad45bc8fd9d5d43750277", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/testrunner.py": [
-   "e819f242e2df532d6e9c62e9292e1f563047c148", 
+   "d3a62646278e38fcb0c86bc163c4595560f5fa3f", 
    "support"
   ], 
   "tools/wptrunner/wptrunner/tests/__init__.py": [
@@ -673146,8 +673460,8 @@
    "e47a3ba7a981e978cdf015f8fc6bfbae6762dba9", 
    "testharness"
   ], 
-  "user-timing/mark-measure-return-null.html": [
-   "5afd9633f24751eb40e3bd5e1d73c47922639f0c", 
+  "user-timing/mark-measure-feature-detection.html": [
+   "6f1ad489e95680fc5d1be4e25dcaa2eeee9a0aa5", 
    "testharness"
   ], 
   "user-timing/mark.any.js": [
@@ -676487,7 +676801,7 @@
    "support"
   ], 
   "webdriver/tests/element_clear/clear.py": [
-   "5d60b991acd0ae708312462a6b40d190c706059f", 
+   "a1017745f3d3999d42fda413324890132f4b04a8", 
    "wdspec"
   ], 
   "webdriver/tests/element_clear/user_prompts.py": [
@@ -678055,7 +678369,7 @@
    "testharness"
   ], 
   "webrtc/RTCPeerConnection-setDescription-transceiver.html": [
-   "5fc957df8fb8d93385fb09b37b388399ddef64d3", 
+   "a8056d473cd7ad3a3bdd348bc689aab756fab778", 
    "testharness"
   ], 
   "webrtc/RTCPeerConnection-setLocalDescription-answer.html": [
@@ -678203,7 +678517,7 @@
    "testharness"
   ], 
   "webrtc/RTCRtpTransceiver.https.html": [
-   "aba2796489603b9798832a64f08988e8507fa29a", 
+   "c200271490eaee404101360768276d9563453c24", 
    "testharness"
   ], 
   "webrtc/RTCSctpTransport-constructor.html": [
diff --git a/tests/wpt/metadata/css/css-animations/computed-style-animation-parsing.html.ini b/tests/wpt/metadata/css/css-animations/computed-style-animation-parsing.html.ini
new file mode 100644
index 00000000000..6a1ab9d1ea0
--- /dev/null
+++ b/tests/wpt/metadata/css/css-animations/computed-style-animation-parsing.html.ini
@@ -0,0 +1,16 @@
+[computed-style-animation-parsing.html]
+  [Test an animation name that is the same as a possible animation fill-mode.]
+    expected: FAIL
+
+  [Test an animation name that is the same as a possible running state.]
+    expected: FAIL
+
+  [Test animation name being empty.]
+    expected: FAIL
+
+  [Test a non-conflicting animation name.]
+    expected: FAIL
+
+  [Test an animation name that is the same as a possible animation direction.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-animations/style-animation-parsing.html.ini b/tests/wpt/metadata/css/css-animations/style-animation-parsing.html.ini
new file mode 100644
index 00000000000..46d53ea9343
--- /dev/null
+++ b/tests/wpt/metadata/css/css-animations/style-animation-parsing.html.ini
@@ -0,0 +1,16 @@
+[style-animation-parsing.html]
+  [Test an animation name that is the same as a possible animation fill-mode.]
+    expected: FAIL
+
+  [Test an animation name that is the same as a possible running state.]
+    expected: FAIL
+
+  [Test animation name being empty.]
+    expected: FAIL
+
+  [Test a non-conflicting animation name.]
+    expected: FAIL
+
+  [Test an animation name that is the same as a possible animation direction.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-backgrounds/background-size/background-size-cover-svg.html.ini b/tests/wpt/metadata/css/css-backgrounds/background-size/background-size-cover-svg.html.ini
new file mode 100644
index 00000000000..8d655776232
--- /dev/null
+++ b/tests/wpt/metadata/css/css-backgrounds/background-size/background-size-cover-svg.html.ini
@@ -0,0 +1,2 @@
+[background-size-cover-svg.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/white-space/pre-float-001.html.ini b/tests/wpt/metadata/css/css-text/white-space/pre-float-001.html.ini
new file mode 100644
index 00000000000..cb52264545b
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/pre-float-001.html.ini
@@ -0,0 +1,2 @@
+[pre-float-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/white-space/pre-wrap-float-001.html.ini b/tests/wpt/metadata/css/css-text/white-space/pre-wrap-float-001.html.ini
new file mode 100644
index 00000000000..6345438ea47
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/pre-wrap-float-001.html.ini
@@ -0,0 +1,2 @@
+[pre-wrap-float-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-transitions/transition-reparented.html.ini b/tests/wpt/metadata/css/css-transitions/transition-reparented.html.ini
new file mode 100644
index 00000000000..b2d796167e0
--- /dev/null
+++ b/tests/wpt/metadata/css/css-transitions/transition-reparented.html.ini
@@ -0,0 +1,4 @@
+[transition-reparented.html]
+  [When an element is reparented, any CSS Transition on it should be cancelled]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/CSSStyleSheet-constructable.html.ini b/tests/wpt/metadata/css/cssom/CSSStyleSheet-constructable.html.ini
new file mode 100644
index 00000000000..de84b9ffb05
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/CSSStyleSheet-constructable.html.ini
@@ -0,0 +1,4 @@
+[CSSStyleSheet-constructable.html]
+  [CSSStyleSheet constructor and adoptedStyleSheets]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html.ini b/tests/wpt/metadata/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html.ini
new file mode 100644
index 00000000000..58c89707184
--- /dev/null
+++ b/tests/wpt/metadata/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html.ini
@@ -0,0 +1,2 @@
+[svg-sourcegraphic-currentcolor-dynamic-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/selectors/attribute-selectors/attribute-case/cssom.html.ini b/tests/wpt/metadata/css/selectors/attribute-selectors/attribute-case/cssom.html.ini
index c1bf5fa223a..63cd6bde7aa 100644
--- a/tests/wpt/metadata/css/selectors/attribute-selectors/attribute-case/cssom.html.ini
+++ b/tests/wpt/metadata/css/selectors/attribute-selectors/attribute-case/cssom.html.ini
@@ -71,3 +71,27 @@
   [[foo="bar"/**/s\] setting CSSStyleRule#selectorText in @media]
     expected: FAIL
 
+  [[*|foo="bar" s\] getting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[*|foo="bar" s\] getting CSSRule#cssText in @media]
+    expected: FAIL
+
+  [[*|foo="bar" s\] insertRule in @media]
+    expected: FAIL
+
+  [[*|foo="bar" s\] getting CSSRule#cssText]
+    expected: FAIL
+
+  [[*|foo="bar" s\] insertRule]
+    expected: FAIL
+
+  [[*|foo="bar" s\] getting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[*|foo="bar" s\] setting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[*|foo="bar" s\] setting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/api/headers/headers-no-cors.window.js.ini b/tests/wpt/metadata/fetch/api/headers/headers-no-cors.window.js.ini
index 6c1059dbd29..2483e89044c 100644
--- a/tests/wpt/metadata/fetch/api/headers/headers-no-cors.window.js.ini
+++ b/tests/wpt/metadata/fetch/api/headers/headers-no-cors.window.js.ini
@@ -32,3 +32,12 @@
   ["no-cors" Headers object cannot have content-language set to sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss, , sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss]
     expected: FAIL
 
+  ["no-cors" Headers object cannot have content-language set to , sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss]
+    expected: FAIL
+
+  ["no-cors" Headers object cannot have accept-language set to , sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss]
+    expected: FAIL
+
+  ["no-cors" Headers object cannot have accept set to , sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
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/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
index 29b0025a2ae..0f1a214d0ee 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/environment-changes/viewport-change.html.ini
@@ -5,11 +5,29 @@
     expected: TIMEOUT
 
   [picture: source (max-width:500px) valid image, img valid image, resize to wide]
-    expected: TIMEOUT
+    expected: FAIL
 
   [picture: source (max-width:500px) valid image, img broken image, resize to narrow]
     expected: TIMEOUT
 
   [picture: source (max-width:500px) valid image, img valid image, resize to narrow]
-    expected: TIMEOUT
+    expected: FAIL
+
+  [picture: source (max-width:500px) broken image, img valid image, resize to narrow]
+    expected: FAIL
+
+  [img (srcset 1 cand) valid image, resize to wide]
+    expected: FAIL
+
+  [picture: same URL in source (max-width:500px) and img, resize to wide]
+    expected: FAIL
+
+  [img (srcset 1 cand) valid image, resize to narrow]
+    expected: FAIL
+
+  [picture: source (max-width:500px) valid image, img broken image, resize to wide]
+    expected: FAIL
+
+  [picture: same URL in source (max-width:500px) and img, resize to narrow]
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
deleted file mode 100644
index 8cc42056d34..00000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ /dev/null
@@ -1,10 +0,0 @@
-[non-active-document.html]
-  [DOMParser]
-    expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/sizes/parse-a-sizes-attribute-standards-mode.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/sizes/parse-a-sizes-attribute-standards-mode.html.ini
index 72a023d1ce4..caa0aa5f39e 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/sizes/parse-a-sizes-attribute-standards-mode.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/sizes/parse-a-sizes-attribute-standards-mode.html.ini
@@ -1,5 +1,4 @@
 [parse-a-sizes-attribute-standards-mode.html]
-  expected: TIMEOUT
   [<img srcset="/images/green-1x1.png?e59 50w, /images/green-16x16.png?e59 51w" sizes="(min-width:0) or (min-width:unknown-mf-value) 1px"> ref sizes="1px" (standards mode)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/syntax/parsing/quotes-in-meta.html.ini b/tests/wpt/metadata/html/syntax/parsing/quotes-in-meta.html.ini
new file mode 100644
index 00000000000..48f4a17ca64
--- /dev/null
+++ b/tests/wpt/metadata/html/syntax/parsing/quotes-in-meta.html.ini
@@ -0,0 +1,4 @@
+[quotes-in-meta.html]
+  [quotes-in-meta]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 99a24216c88..7725b118e9d 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -12,3 +12,6 @@
   [Verifies the resolution of entry.startTime is at least 5 microseconds.]
     expected: TIMEOUT
 
+  [Verifies the resolution of performance.now() is at least 5 microseconds.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/quirks/unitless-length/limited-quirks.html.ini b/tests/wpt/metadata/quirks/unitless-length/no-quirks.html.ini
similarity index 99%
rename from tests/wpt/metadata/quirks/unitless-length/limited-quirks.html.ini
rename to tests/wpt/metadata/quirks/unitless-length/no-quirks.html.ini
index c7e9c7434f5..818a429ed39 100644
--- a/tests/wpt/metadata/quirks/unitless-length/limited-quirks.html.ini
+++ b/tests/wpt/metadata/quirks/unitless-length/no-quirks.html.ini
@@ -1,4 +1,4 @@
-[limited-quirks.html]
+[no-quirks.html]
   [top: -\\31 .5]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/resource-timing/single-entry-per-resource.html.ini b/tests/wpt/metadata/resource-timing/single-entry-per-resource.html.ini
index 485e42b1d78..325806cd7c6 100644
--- a/tests/wpt/metadata/resource-timing/single-entry-per-resource.html.ini
+++ b/tests/wpt/metadata/resource-timing/single-entry-per-resource.html.ini
@@ -2,6 +2,3 @@
   [One resource when reusing data]
     expected: FAIL
 
-  [Only one resource entry per resource]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
index 268949ced5c..f584fce5df1 100644
--- a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
+++ b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
@@ -1,4 +1,5 @@
 [005.html]
+  expected: ERROR
   [dedicated worker in shared worker in dedicated worker]
     expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/css/css-animations/computed-style-animation-parsing.html b/tests/wpt/web-platform-tests/css/css-animations/computed-style-animation-parsing.html
new file mode 100644
index 00000000000..15a1665be5e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-animations/computed-style-animation-parsing.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Animations: parsing computedStyle.animation</title>
+<link rel="help" href="https://drafts.csswg.org/css-animations/#animation">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="test1"></div>
+<div id="test2"></div>
+<script>
+function testComputedStyle(computedStyle1, computedStyle2, name) {
+  assert_equals(computedStyle1.animationName, name, "computedStyle1.animationName");
+  assert_equals(computedStyle2.animationName, name, "computedStyle2.animationName");
+  assert_equals(computedStyle1.animation, computedStyle2.animation,
+                "computedStyle1 and computedStyle2 should have the same animation");
+}
+
+function testAnimation(input, name) {
+  var style1 = test1.style;
+  var style2 = test2.style;
+  var computedStyle1 = getComputedStyle(test1);
+  var computedStyle2 = getComputedStyle(test2);
+
+  style1.animation = input;
+  style2.animation = style1.animation;
+  testComputedStyle(computedStyle1, computedStyle2, name);
+  style2.animation = computedStyle1.animation;
+  testComputedStyle(computedStyle1, computedStyle2, name);
+}
+
+test(() => {
+  // We are duplicating the logic of testAnimation because the animationName of
+  // the getComputedStyle is "none" when there is no animation.
+  var style1 = test1.style;
+  var style2 = test2.style;
+  var computedStyle1 = getComputedStyle(test1);
+  var computedStyle2 = getComputedStyle(test2);
+
+  style1.animation = "";
+  style2.animation = style1.animation;
+  testComputedStyle(computedStyle1, computedStyle2, "none");
+  style2.animation = computedStyle1.animation;
+  assert_equals(computedStyle2.animationName, "none");
+}, "Test animation name being empty.");
+
+test(() => {
+  testAnimation("myShorthandAnim", "myShorthandAnim");
+}, "Test a non-conflicting animation name.");
+
+test(() => {
+  testAnimation("none", "none");
+  testAnimation("forwards", "none");
+  testAnimation("none forwards", "forwards");
+}, "Test an animation name that is the same as a possible animation fill-mode.");
+
+test(() => {
+  testAnimation("normal", "none");
+  testAnimation("reverse", "none");
+  testAnimation("normal normal", "normal");
+  testAnimation("normal reverse", "reverse");
+}, "Test an animation name that is the same as a possible animation direction.");
+
+test(() => {
+  testAnimation("running", "none");
+  testAnimation("paused", "none");
+  testAnimation("running running", "running");
+  testAnimation("running paused", "paused");
+}, "Test an animation name that is the same as a possible running state.");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-animations/style-animation-parsing.html b/tests/wpt/web-platform-tests/css/css-animations/style-animation-parsing.html
new file mode 100644
index 00000000000..792fda33ed8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-animations/style-animation-parsing.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Animations: parsing style.animation</title>
+<link rel="help" href="https://drafts.csswg.org/css-animations/#animation">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="test1"></div>
+<div id="test2"></div>
+<script>
+function testStyle(style1, style2, name) {
+  assert_equals(style1.animationName, name, "style1.animationName");
+  assert_equals(style2.animationName, name, "style2.animationName");
+  assert_equals(style1.animation, style2.animation,
+                "style1 and style2 should have the same animation");
+}
+
+function testAnimation(input, name) {
+  var style1 = test1.style;
+  var style2 = test2.style;
+
+  style1.animation = input;
+  style2.animation = style1.animation;
+  testStyle(style1, style2, name);
+}
+
+test(() => {
+  testAnimation("", "");
+}, "Test animation name being empty.");
+
+test(() => {
+  testAnimation("myShorthandAnim", "myShorthandAnim");
+}, "Test a non-conflicting animation name.");
+
+test(() => {
+  testAnimation("none", "none");
+  testAnimation("forwards", "none");
+  testAnimation("none forwards", "forwards");
+}, "Test an animation name that is the same as a possible animation fill-mode.");
+
+test(() => {
+  testAnimation("normal", "none");
+  testAnimation("reverse", "none");
+  testAnimation("normal normal", "normal");
+  testAnimation("normal reverse", "reverse");
+}, "Test an animation name that is the same as a possible animation direction.");
+
+test(() => {
+  testAnimation("running", "none");
+  testAnimation("paused", "none");
+  testAnimation("running running", "running");
+  testAnimation("running paused", "paused");
+}, "Test an animation name that is the same as a possible running state.");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/background-size-cover-svg.html b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/background-size-cover-svg.html
new file mode 100644
index 00000000000..5e33c75afce
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/background-size-cover-svg.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Background Test: A SVG background should fully cover the positioning area</title>
+  <link rel="author" title="schenney" href="mailto:schenney@chromium.org">
+  <link rel="help" href="http://www.w3.org/TR/css3-background">
+  <link rel="match" href="reference/background-size-cover-svg-ref.html">
+  <style>
+    div {
+      height: 400px;
+      width: 600px;
+      position: relative;
+      background-color: red;
+      background-size: cover;
+      background-repeat: no-repeat;
+      background-position: bottom center;
+      background-image: url("support/rectangle-2560x208.svg");
+    }
+  </style>
+</head>
+
+<body>
+  <div></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html
new file mode 100644
index 00000000000..b6dd172aa66
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/reference/background-size-cover-svg-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Background Test Reference</title>
+  <link rel="author" title="schenney" href="mailto:schenney@chromium.org">
+  <style>
+    div {
+      height: 400px;
+      width: 600px;
+      position: relative;
+      background-color: red;
+      background-repeat: repeat;
+      background-position: bottom center;
+      background-image: url("../support/50x50-green.png");
+    }
+  </style>
+</head>
+
+<body>
+  <div></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/support/rectangle-2560x208.svg b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/support/rectangle-2560x208.svg
new file mode 100644
index 00000000000..578dd86ae05
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/background-size/support/rectangle-2560x208.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 2560 208">
+    <rect fill="green" width="2560" height="208"/>
+</svg>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005-ref.html
new file mode 100644
index 00000000000..641fbb9dcf5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005-ref.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <title>CSS Multi-column Layout Test Reference: Test column-span:all with various display types</title>
+  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+
+  <style>
+  .column {
+    column-count: 1;
+    column-rule: 6px solid;
+    width: 600px;
+    outline: 1px solid black;
+  }
+  .spanner {
+    /* column-count: 1 makes this behave like a real spanner. */
+    outline: 1px solid blue;
+  }
+  fieldset {
+    margin: 0;
+    padding: 0;
+    border: 0;
+  }
+  </style>
+
+  <body>
+    <article class="column">
+      <div>block1</div>
+      <table class="spanner">
+        <tr>
+          <td>table as a spanner</td>
+        </tr>
+      </table>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <div class="spanner" style="display: grid;">grid as a spanner</div>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <div class="spanner" style="display: flex;">flex as a spanner</div>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <fieldset class="spanner">fieldset as a spanner</fieldset>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <details open class="spanner">details as a spanner</details>
+      <div>block2</div>
+    </article>
+    <br>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005.html
new file mode 100644
index 00000000000..249b69b7107
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-005.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <title>CSS Multi-column Layout Test: Test column-span:all with various display types</title>
+  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
+  <link rel="match" href="multicol-span-all-005-ref.html">
+  <meta name="assert" content="This test checks a column-span:all element should act like column-span: none if it's under different block formatting context.">
+
+  <style>
+  .column {
+    column-count: 3;
+    column-rule: 6px solid;
+    width: 600px;
+    outline: 1px solid black;
+  }
+  .spanner {
+    column-span: all;
+    outline: 1px solid blue;
+  }
+  fieldset {
+    margin: 0;
+    padding: 0;
+    border: 0;
+  }
+  </style>
+
+  <body>
+    <article class="column">
+      <div>block1</div>
+      <table class="spanner">
+        <tr>
+          <td>table as a spanner</td>
+        </tr>
+      </table>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <div class="spanner" style="display: grid;">grid as a spanner</div>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <div class="spanner" style="display: flex;">flex as a spanner</div>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <fieldset class="spanner">fieldset as a spanner</fieldset>
+      <div>block2</div>
+    </article>
+    <br>
+
+    <article class="column">
+      <div>block1</div>
+      <details open class="spanner">details as a spanner</details>
+      <div>block2</div>
+    </article>
+    <br>
+
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-scoping/slotted-nested.html b/tests/wpt/web-platform-tests/css/css-scoping/slotted-nested.html
new file mode 100644
index 00000000000..c7139fea4c2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scoping/slotted-nested.html
@@ -0,0 +1,49 @@
+<!doctype html>
+<link rel="href" href="https://mozilla.org" title="Mozilla">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="host"><p>This text should be green</p></div>
+<script>
+  let shadow = host.attachShadow({ mode: "open" });
+  shadow.innerHTML = `
+    <style>
+      /* This is not expected to match */
+      .container ::slotted(p) {
+        color: red !important;
+      }
+
+      /* This _is_ expected to match */
+      #nested ::slotted(p) {
+        background-color: green;
+      }
+    </style>
+    <div id="nested"><slot></slot></div>
+  `;
+
+  let nested = shadow.querySelector("#nested").attachShadow({ mode: "open" });
+  nested.innerHTML = `
+    <style>
+      .container ::slotted(p) {
+        color: green;
+      }
+    </style>
+    <div class="container">
+      <slot></slot>
+    </div>
+  `;
+
+  let p = document.querySelector("p");
+  test(function() {
+    assert_equals(getComputedStyle(p).color, "rgb(0, 128, 0)");
+    assert_equals(getComputedStyle(p).backgroundColor, "rgb(0, 128, 0)");
+  }, "Slotted matches rules against the slot in the right tree");
+  test(function() {
+    nested.querySelector(".container").classList.remove("container");
+    assert_not_equals(getComputedStyle(p).color, "rgb(0, 128, 0)");
+
+    nested.host.removeAttribute("id");
+    assert_not_equals(getComputedStyle(p).backgroundColor, "rgb(0, 128, 0)");
+  }, "Style invalidation works correctly for nested slots");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/pre-float-001.html b/tests/wpt/web-platform-tests/css/css-text/white-space/pre-float-001.html
new file mode 100644
index 00000000000..4d9f8bba4d5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/pre-float-001.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>CSS test preserved spaces and floats interaction</title>
+<link rel="author" title="Koji Ishii" href="kojii@chromium.org">
+<link rel="match" href="reference/pre-float-001-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<style>
+html {
+  font-family: Ahem;
+  font-size: 20px;
+  line-height: 1;
+}
+.container {
+  white-space: pre;
+  width: 10ch;
+  margin-bottom: 1em;
+}
+.float {
+  float: left;
+  width: 3ch;
+  height: 2em;
+  background: orange;
+}
+</style>
+<body>
+  <div class="float"></div>
+  <div class="container">123456 <br>123456</div>
+  <div class="float"></div>
+  <div class="container">1234567 <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567  <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567   <br>1234567</div>
+  <div class="float"></div>
+  <div class="container">12345678 <br>12345678</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/pre-wrap-float-001.html b/tests/wpt/web-platform-tests/css/css-text/white-space/pre-wrap-float-001.html
new file mode 100644
index 00000000000..6ef0faa0cf8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/pre-wrap-float-001.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>CSS test preserved spaces and floats interaction</title>
+<link rel="author" title="Koji Ishii" href="kojii@chromium.org">
+<link rel="match" href="reference/pre-wrap-float-001-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<style>
+html {
+  font-family: Ahem;
+  font-size: 20px;
+  line-height: 1;
+}
+.container {
+  white-space: pre-wrap;
+  width: 10ch;
+  margin-bottom: 1em;
+}
+.float {
+  float: left;
+  width: 3ch;
+  height: 2em;
+  background: orange;
+}
+</style>
+<body>
+  <div class="float"></div>
+  <div class="container">123456 123456</div>
+  <div class="float"></div>
+  <div class="container">1234567 1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567  1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567   1234567</div>
+  <div class="float"></div>
+  <div class="container">12345678 12345678</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-float-001-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-float-001-ref.html
new file mode 100644
index 00000000000..b05c008bed1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-float-001-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<style>
+html {
+  font-family: Ahem;
+  font-size: 20px;
+  line-height: 1;
+}
+.container {
+  white-space: pre;
+  margin-bottom: 1em;
+}
+.float {
+  float: left;
+  width: 3ch;
+  height: 2em;
+  background: orange;
+}
+</style>
+<body>
+  <div class="float"></div>
+  <div class="container">123456<br>123456</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container">12345678<br>12345678</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-wrap-float-001-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-wrap-float-001-ref.html
new file mode 100644
index 00000000000..09ca86dd699
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/pre-wrap-float-001-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<style>
+html {
+  font-family: Ahem;
+  font-size: 20px;
+  line-height: 1;
+}
+.container {
+  white-space: pre;
+  margin-bottom: 1em;
+}
+.float {
+  float: left;
+  width: 3ch;
+  height: 2em;
+  background: orange;
+}
+</style>
+<body>
+  <div class="float"></div>
+  <div class="container">123456<br>123456</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container">1234567<br>1234567</div>
+  <div class="float"></div>
+  <div class="container"><br><br>12345678<br>12345678</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-transitions/transition-reparented.html b/tests/wpt/web-platform-tests/css/css-transitions/transition-reparented.html
new file mode 100644
index 00000000000..3dfd19425fc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-transitions/transition-reparented.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Transition should cancel when an element is reparented</title>
+<link rel="help" href="https://www.w3.org/TR/css-transitions-1/#starting">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+.animated-div {
+  margin-left: 100px;
+  transition: margin-left 10s -5s linear;
+}
+</style>
+
+<div id="parent1">
+  <div id="target" class='animated-div'></div>
+</div>
+
+<div id="parent2"></div>
+
+<script>
+'use strict';
+
+test(t => {
+  assert_equals(getComputedStyle(target).marginLeft, '100px');
+  target.style.marginLeft = '200px';
+
+  // Because the start delay is -50% of the transition duration, we should
+  // immediately be (approximately) at the halfway point. What we really care
+  // about checking is that the transition has started but has not ended.
+  assert_not_equals(getComputedStyle(target).marginLeft, '100px');
+  assert_not_equals(getComputedStyle(target).marginLeft, '200px');
+
+  // Now change the target's parent. This should cancel the transition and
+  // skip straight to the end state.
+  parent2.appendChild(target);
+  assert_equals(getComputedStyle(target).marginLeft, '200px');
+}, 'When an element is reparented, any CSS Transition on it should be cancelled');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html b/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html
new file mode 100644
index 00000000000..7df1820c043
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom/CSSStyleSheet-constructable.html
@@ -0,0 +1,515 @@
+<!DOCTYPE html>
+<title>CSSStyleSheet constructor and adoptedStyleSheets</title>
+<link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org">
+<link rel="help" href="https://wicg.github.io/construct-stylesheets/">
+<script src = '/resources/testharness.js'></script>
+<script src = '/resources/testharnessreport.js'></script>
+
+<section id="firstSection">
+  <div>
+    <span class="green"></span>
+    <span class="red"></span>
+    <span class="blue"></span>
+    <span class="white"></span>
+    <span class="yellow"></span>
+  </div>
+</section>
+<section id="secondSection"></section>
+<section id="thirdSection"></section>
+
+<script>
+'use strict';
+const greenStyleText = ".green { color: green; }";
+const redStyleTexts = [".red { color: red; }", ".red + span + span { color: red; }"];
+const blueStyleTexts = [".blue { color: blue; }", ".blue + span + span { color: blue; }"];
+const whiteStyleText = "* { color: white; }";
+const yellowStyleText = ".yellow { color: yellow; }";
+
+const firstDiv = document.querySelector('#firstSection > div');
+const secondDiv = firstDiv.cloneNode(true);
+const shadowRoot = document.querySelector('#secondSection').attachShadow({mode: 'open'});
+shadowRoot.appendChild(secondDiv);
+
+const greenSpan = firstDiv.children[0];
+const redSpan = firstDiv.children[1];
+const blueSpan = firstDiv.children[2];
+const whiteSpan = firstDiv.children[3];
+const yellowSpan = firstDiv.children[4];
+const greenShadowSpan = secondDiv.children[0];
+const redShadowSpan = secondDiv.children[1];
+const blueShadowSpan = secondDiv.children[2];
+const whiteShadowSpan = secondDiv.children[3];
+const yellowShadowSpan = secondDiv.children[4];
+
+test(() => {
+  assert_equals(document.adoptedStyleSheets.length, 0);
+}, "document.adoptedStyleSheets should initially have length 0.");
+
+test(() => {
+  const sheet = new CSSStyleSheet({title: "Red", disabled: true, media: "screen, print"});
+  assert_equals(sheet.title, "Red");
+  assert_equals(sheet.ownerNode, null);
+  assert_equals(sheet.ownerRule, null);
+  assert_equals(sheet.media.length, 2);
+  assert_equals(sheet.media.item(0), "screen");
+  assert_equals(sheet.media.item(1), "print");
+  assert_true(sheet.disabled);
+  assert_equals(sheet.cssRules.length, 0);
+
+  sheet.insertRule(redStyleTexts[0]);
+  assert_equals(sheet.cssRules.length, 1);
+  assert_equals(sheet.cssRules[0].cssText, redStyleTexts[0]);
+
+  sheet.insertRule(redStyleTexts[1]);
+  assert_equals(sheet.cssRules.length, 2);
+  assert_equals(sheet.cssRules[0].cssText, redStyleTexts[1]);
+
+  const sheet2 = new CSSStyleSheet({});
+  assert_equals(sheet2.title, "")
+  assert_equals(sheet2.ownerNode, null);
+  assert_equals(sheet2.ownerRule, null);
+  assert_equals(sheet2.media.length, 0);
+  assert_false(sheet2.disabled);
+  assert_equals(sheet2.cssRules.length, 0);
+
+  sheet2.insertRule(redStyleTexts[1]);
+  assert_equals(sheet2.cssRules.length, 1);
+  assert_equals(sheet2.cssRules[0].cssText, redStyleTexts[1]);
+
+  sheet2.deleteRule(0);
+  assert_equals(sheet2.cssRules.length, 0);
+
+const sheet3 = new CSSStyleSheet();
+  assert_equals(sheet3.title, "")
+  assert_equals(sheet3.ownerNode, null);
+  assert_equals(sheet3.ownerRule, null);
+  assert_equals(sheet3.media.length, 0);
+  assert_false(sheet3.disabled);
+  assert_equals(sheet3.cssRules.length, 0);
+
+  sheet3.insertRule(redStyleTexts[1]);
+  assert_equals(sheet3.cssRules.length, 1);
+  assert_equals(sheet3.cssRules[0].cssText, redStyleTexts[1]);
+
+  sheet3.deleteRule(0);
+  assert_equals(sheet3.cssRules.length, 0);
+}, 'new CSSStyleSheet produces empty CSSStyleSheet');
+
+promise_test(() => {
+  const sheet = new CSSStyleSheet({title: "Red", disabled: true, media: "screen, print"});
+  const promise_sheet = sheet.replace(redStyleTexts[0]);
+  return promise_sheet.then(function(sheet) {
+    assert_equals(sheet.title, "Red");
+    assert_equals(sheet.ownerNode, null);
+    assert_equals(sheet.ownerRule, null);
+    assert_equals(sheet.media.length, 2);
+    assert_equals(sheet.media.item(0), "screen");
+    assert_equals(sheet.media.item(1), "print");
+    assert_true(sheet.disabled);
+    assert_equals(sheet.cssRules.length, 1);
+    assert_equals(sheet.cssRules[0].cssText, redStyleTexts[0]);
+
+    sheet.insertRule(redStyleTexts[1]);
+    assert_equals(sheet.cssRules.length, 2);
+    assert_equals(sheet.cssRules[0].cssText, redStyleTexts[1]);
+  });
+}, 'CSSStyleSheet.replace produces Promise<CSSStyleSheet>');
+
+function createAllSheetsPromise() {
+  const greenSheet = new CSSStyleSheet();
+  const redSheet = new CSSStyleSheet({media: "screen, print"});
+  const blueSheet = new CSSStyleSheet({title: "Blue", disabled: true});
+  const whiteSheet = new CSSStyleSheet({title: "White", alternate: true});
+  const yellowSheet = new CSSStyleSheet({disabled: false});
+
+  const greenPromise = greenSheet.replace(greenStyleText);
+  const redPromise = redSheet.replace(redStyleTexts[0] + redStyleTexts[1]);
+  const bluePromise = blueSheet.replace(blueStyleTexts[0] + blueStyleTexts[1]);
+  const whitePromise = whiteSheet.replace(whiteStyleText);
+  const yellowPromise = yellowSheet.replace(yellowStyleText);
+  return [greenPromise, redPromise, bluePromise, whitePromise, yellowPromise];
+}
+
+promise_test(() => {
+  return Promise.all(createAllSheetsPromise()).then(values => {
+    const greenStyleSheet = values[0];
+    const redStyleSheet = values[1];
+    const blueStyleSheet = values[2];
+    const whiteStyleSheet = values[3];
+    const yellowStyleSheet = values[4];
+
+    // Lists of style sheets can be created, assigned and read.
+    document.adoptedStyleSheets = [whiteStyleSheet];
+    // alternate stylesheets aren't applied when title != current preferable name
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    document.adoptedStyleSheets = [greenStyleSheet, blueStyleSheet];
+    // disabled stylesheets aren't applied
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 128, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    document.adoptedStyleSheets = [redStyleSheet, yellowStyleSheet];
+
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(255, 255, 0)");
+
+    document.adoptedStyleSheets = [redStyleSheet, yellowStyleSheet, greenStyleSheet, blueStyleSheet];
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 128, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(255, 255, 0)");
+  });
+}, 'Constructed style sheets can be applied on document');
+
+promise_test(() => {
+  return Promise.all(createAllSheetsPromise()).then(values => {
+    const greenStyleSheet = values[0];
+    const redStyleSheet = values[1];
+    const blueStyleSheet = values[2];
+    const whiteStyleSheet = values[3];
+    const yellowStyleSheet = values[4];
+    shadowRoot.adoptedStyleSheets = [whiteStyleSheet];
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(0, 0, 0)");
+
+    shadowRoot.adoptedStyleSheets = [greenStyleSheet, blueStyleSheet];
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 128, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(0, 0, 0)");
+
+    shadowRoot.adoptedStyleSheets = [redStyleSheet, yellowStyleSheet];
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(255, 255, 0)");
+
+    shadowRoot.adoptedStyleSheets = [redStyleSheet, yellowStyleSheet, greenStyleSheet, blueStyleSheet];
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 128, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(255, 255, 0)");
+  });
+}, 'Constructed style sheets can be applied on shadow root');
+
+promise_test(() => {
+  const plainSheet = new CSSStyleSheet();
+  const redStyleSheetPromise = plainSheet.replace(redStyleTexts[0]);
+  return redStyleSheetPromise.then(function(redStyleSheet) {
+    document.adoptedStyleSheets = [redStyleSheet];
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    redStyleSheet.insertRule(redStyleTexts[1]);
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    redStyleSheet.deleteRule(1);
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    redStyleSheet.cssRules[0].style.color = "white";
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 255, 255)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+});
+}, 'Changes to constructed stylesheets through CSSOM is reflected');
+
+promise_test(() => {
+  const plainSheet = new CSSStyleSheet();
+  const redStyleSheetPromise = plainSheet.replace(redStyleTexts[0]);
+  return redStyleSheetPromise.then(function(redStyleSheet) {
+    document.adoptedStyleSheets = [redStyleSheet];
+    shadowRoot.adoptedStyleSheets = [redStyleSheet];
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(0, 0, 0)");
+
+    shadowRoot.adoptedStyleSheets[0].insertRule(redStyleTexts[1]);
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    assert_equals(getComputedStyle(greenShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueShadowSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteShadowSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowShadowSpan).color, "rgb(0, 0, 0)");
+});
+}, 'Constructed stylesheet can be used and modified in multiple TreeScopes');
+
+promise_test(() => {
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  const thirdDiv = firstDiv.cloneNode(true);
+  iframe.contentDocument.body.appendChild(thirdDiv);
+  const greenIframeSpan = thirdDiv.children[0];
+  const redIframeSpan = thirdDiv.children[1];
+  const blueIframeSpan = thirdDiv.children[2];
+  const whiteIframeSpan = thirdDiv.children[3];
+  const yellowIframeSpan = thirdDiv.children[4];
+
+  const plainSheet = new CSSStyleSheet();
+  const redStyleSheetPromise = plainSheet.replace(redStyleTexts[0]);
+  return redStyleSheetPromise.then(function(redStyleSheet) {
+    assert_throws('NotAllowedError', () => { iframe.contentDocument.adoptedStyleSheets = [redStyleSheet]; });
+    assert_equals(getComputedStyle(greenIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowIframeSpan).color, "rgb(0, 0, 0)");
+
+    document.adoptedStyleSheets = [redStyleSheet];
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    document.adoptedStyleSheets[0].insertRule(redStyleTexts[1]);
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+  });
+}, 'Stylesheets constructed on the main Document cannot be used in iframes');
+
+promise_test(() => {
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  const thirdDiv = firstDiv.cloneNode(true);
+  iframe.contentDocument.body.appendChild(thirdDiv);
+  const greenIframeSpan = thirdDiv.children[0];
+  const redIframeSpan = thirdDiv.children[1];
+  const blueIframeSpan = thirdDiv.children[2];
+  const whiteIframeSpan = thirdDiv.children[3];
+  const yellowIframeSpan = thirdDiv.children[4];
+
+  // Make sure both the main Document and the iframe are not styled
+  const emptyStyleSheet = new CSSStyleSheet();
+  document.adoptedStyleSheets = [emptyStyleSheet];
+  assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+  assert_equals(getComputedStyle(greenIframeSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(redIframeSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(blueIframeSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(whiteIframeSpan).color, "rgb(0, 0, 0)");
+  assert_equals(getComputedStyle(yellowIframeSpan).color, "rgb(0, 0, 0)");
+
+  const iframePlainSheet = new iframe.contentWindow.CSSStyleSheet();
+  const iframeRedStyleSheetPromise = iframePlainSheet.replace(redStyleTexts[0]);
+  return iframeRedStyleSheetPromise.then(function(iframeRedStyleSheet) {
+    assert_throws('NotAllowedError', () => { document.adoptedStyleSheets = [iframeRedStyleSheet]; });
+    assert_equals(getComputedStyle(greenSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(blueSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowSpan).color, "rgb(0, 0, 0)");
+
+    iframe.contentDocument.adoptedStyleSheets = [iframeRedStyleSheet];
+    assert_equals(getComputedStyle(greenIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redIframeSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(yellowIframeSpan).color, "rgb(0, 0, 0)");
+
+    iframe.contentDocument.adoptedStyleSheets[0].insertRule(redStyleTexts[1]);
+    assert_equals(getComputedStyle(greenIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(redIframeSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(blueIframeSpan).color, "rgb(0, 0, 0)");
+    assert_equals(getComputedStyle(whiteIframeSpan).color, "rgb(255, 0, 0)");
+    assert_equals(getComputedStyle(yellowIframeSpan).color, "rgb(0, 0, 0)");
+  });
+}, 'Stylesheet constructed on iframe cannot be used in the main Document');
+</script>
+
+<div id="divNonConstructed" class="nonConstructed">
+</div>
+
+<script>
+`use strict`;
+const shadowRootNonConstructed = divNonConstructed.attachShadow({mode:'open'})
+nonConstructedStyle = document.createElement("style");
+shadowRootNonConstructed.appendChild(nonConstructedStyle);
+nonConstructedStyle.sheet.insertRule(".nonConstructed { color: red; }", 0);
+const nonConstructedStyleSheet = nonConstructedStyle.sheet;
+
+test(() => {
+  assert_equals(getComputedStyle(divNonConstructed).color, "rgb(0, 0, 0)");
+  assert_throws('NotAllowedError', () => { document.adoptedStyleSheets = [nonConstructedStyleSheet]; });
+}, 'Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet is in the same document tree as the AdoptedStyleSheets');
+
+test(() => {
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  iframeDiv = iframe.contentDocument.createElement("div");
+  iframeDiv.classList.add("nonConstructed");
+  iframe.contentDocument.body.appendChild(iframeDiv);
+
+  assert_equals(getComputedStyle(iframeDiv).color, "rgb(0, 0, 0)");
+  assert_throws('NotAllowedError', () => { iframe.contentDocument.adoptedStyleSheets = [nonConstructedStyleSheet]; });
+  assert_equals(getComputedStyle(iframeDiv).color, "rgb(0, 0, 0)");
+
+  iframeStyle = iframe.contentDocument.createElement("style");
+  iframe.contentDocument.body.appendChild(iframeStyle);
+  iframeStyle.sheet.insertRule(".nonConstructedSpan { color: red; }");
+  const iframeStyleSheet = iframeStyle.sheet;
+  nonConstructedSpan = document.createElement("span");
+  nonConstructedSpan.classList.add(".nonConstructedSpan");
+  divNonConstructed.appendChild(nonConstructedSpan);
+
+  assert_equals(getComputedStyle(iframeDiv).color, "rgb(0, 0, 0)");
+  assert_throws('NotAllowedError', () => { document.adoptedStyleSheets = [iframeStyleSheet]; });
+  assert_equals(getComputedStyle(iframeDiv).color, "rgb(0, 0, 0)");
+}, 'Adding non-constructed stylesheet to AdoptedStyleSheets is not allowed when the owner document of the stylesheet and the AdoptedStyleSheets are in different document trees');
+
+function attachShadowDiv(host) {
+  const shadowRoot = host.attachShadow({mode: 'open'});
+  const shadowDiv = document.createElement("div");
+  shadowRoot.appendChild(shadowDiv);
+  return shadowDiv;
+}
+
+test(() => {
+  // Attach a div inside a shadow root with the class ".red".
+  const span = document.createElement("span");
+  thirdSection.appendChild(span);
+  const shadowDiv = attachShadowDiv(span);
+  shadowDiv.classList.add("red");
+  // Create empty stylesheet.
+  const sheet = new CSSStyleSheet();
+  span.shadowRoot.adoptedStyleSheets = [sheet];
+  assert_equals(getComputedStyle(shadowDiv).color, "rgb(0, 0, 0)");
+  // Replace the stylesheet text that will color it red.
+  sheet.replaceSync(redStyleTexts[0]);
+  assert_equals(getComputedStyle(shadowDiv).color, "rgb(255, 0, 0)");
+  assert_equals(sheet.cssRules.length, 1);
+  assert_equals(sheet.cssRules[0].cssText, redStyleTexts[0]);
+  sheet.insertRule(redStyleTexts[1]);
+  assert_equals(sheet.cssRules.length, 2);
+  assert_equals(sheet.cssRules[0].cssText, redStyleTexts[1]);
+}, 'CSSStyleSheet.replaceSync replaces stylesheet text synchronously');
+
+const import_text = '@import url("support/constructable-import.css");';
+
+test(() => {
+  assert_throws("NotAllowedError", () => { (new CSSStyleSheet).replaceSync(import_text) });
+}, 'CSSStyleSheet.replaceSync throws exception when there is import rule inside');
+
+test(() => {
+  assert_throws("NotAllowedError", () => { (new CSSStyleSheet).insertRule(import_text) });
+}, 'Inserting an @import rule through insertRule on a constructed stylesheet throws an exception');
+
+promise_test(() => {
+  const span = document.createElement("span");
+  thirdSection.appendChild(span);
+  const shadowDiv = attachShadowDiv(span);
+  const sheet = new CSSStyleSheet();
+  span.shadowRoot.adoptedStyleSheets = [sheet];
+  assert_equals(getComputedStyle(shadowDiv).color, "rgb(0, 0, 0)");
+  // Replace and assert that the imported rule is applied.
+  const sheet_promise = sheet.replace(import_text);
+  return sheet_promise.then((sheet) => {
+    assert_equals(sheet.cssRules.length, 1);
+    assert_equals(sheet.cssRules[0].cssText, import_text);
+    assert_equals(getComputedStyle(shadowDiv).color, "rgb(255, 0, 0)");
+  });
+}, 'CSSStyleSheet.replace allows import rule inside');
+
+promise_test(() => {
+  const sheet = new CSSStyleSheet();
+  const sheet_promise = sheet.replace("import url('not-there.css');");
+  return sheet_promise.catch((reason) => {
+    assert_equals(reason.name, "NotAllowedError");
+  });
+}, 'CSSStyleSheet.replace returns rejected promise on failed imports');
+
+test(() => {
+  const span = document.createElement("span");
+  thirdSection.appendChild(span);
+  const shadowDiv = attachShadowDiv(span);
+  const sheet = new CSSStyleSheet();
+  span.shadowRoot.adoptedStyleSheets = [sheet];
+
+  const newSpan = span.cloneNode(true);
+  assert_equals(newSpan.shadowRoot, null);
+}, 'Cloning a shadow host will not clone shadow root, and also adoptedStyleSheets');
+
+test(() => {
+  const span = document.createElement("span");
+  thirdSection.appendChild(span);
+  const shadowDiv = attachShadowDiv(span);
+  const sheet = new CSSStyleSheet();
+  span.shadowRoot.adoptedStyleSheets = [sheet];
+
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  const newSpan = iframe.contentDocument.importNode(span, true);
+  iframe.contentDocument.body.appendChild(newSpan);
+  assert_equals(newSpan.shadowRoot, null);
+}, 'Importing a shadow host will not copy shadow root, and also adoptedStyleSheets');
+
+test(() => {
+  const span = document.createElement("span");
+  thirdSection.appendChild(span);
+  const shadowDiv = attachShadowDiv(span);
+  const sheet = new CSSStyleSheet();
+  sheet.replaceSync("* { color: red; }");
+  span.shadowRoot.adoptedStyleSheets = [sheet];
+  assert_equals(getComputedStyle(shadowDiv).color, "rgb(255, 0, 0)");
+
+  const iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  iframe.contentDocument.adoptNode(span);
+  iframe.contentDocument.body.appendChild(span);
+  assert_not_equals(span.shadowRoot, null);
+  assert_equals(span.shadowRoot.adoptedStyleSheets.length, 1);
+  assert_equals(span.shadowRoot.adoptedStyleSheets[0], sheet);
+  assert_equals(getComputedStyle(shadowDiv).color, "rgb(0, 0, 0)");
+}, 'Adopting a shadow host will move adoptedStyleSheets but it is not applied');
+
+</script>
+
diff --git a/tests/wpt/web-platform-tests/css/cssom/support/constructable-import.css b/tests/wpt/web-platform-tests/css/cssom/support/constructable-import.css
new file mode 100644
index 00000000000..d8ccc9d491b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom/support/constructable-import.css
@@ -0,0 +1,3 @@
+* {
+  color: red;
+}
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/reference/green-100x100.html b/tests/wpt/web-platform-tests/css/filter-effects/reference/green-100x100.html
new file mode 100644
index 00000000000..f718ea6abfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/reference/green-100x100.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="width: 100px; height: 100px; background-color: green"></div>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html b/tests/wpt/web-platform-tests/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html
new file mode 100644
index 00000000000..e3be6544dc8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/svg-sourcegraphic-currentcolor-dynamic-001.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Filter Effects: Dynamic 'currentcolor' in SourceGraphic</title>
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#attr-valuedef-in-sourcegraphic">
+<link rel="match" href="reference/green-100x100.html">
+<style>
+rect {
+  fill: currentColor;
+}
+
+.filtered {
+  filter: url(#filter);
+}
+
+.green {
+  color: green;
+}
+</style>
+<svg style="color: red">
+  <defs>
+    <filter id="filter" color-interpolation-filters="sRGB">
+      <feMerge>
+        <feMergeNode/>
+      </feMerge>
+    </filter>
+  </defs>
+
+  <g class="target filtered">
+    <rect width="50" height="100"/>
+  </g>
+
+  <g class="target">
+    <g class="filtered">
+      <rect x="50" width="50" height="100"/>
+    </g>
+  </g>
+</svg>
+<script>
+document.body.offsetTop;
+requestAnimationFrame(function() {
+  requestAnimationFrame(function() {
+    let targets = document.querySelectorAll('.target');
+    for (let i = 0; i < targets.length; ++i)
+      targets[i].classList.toggle('green');
+    document.documentElement.classList.remove('reftest-wait');
+  });
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/attribute-selectors/attribute-case/cssom.html b/tests/wpt/web-platform-tests/css/selectors/attribute-selectors/attribute-case/cssom.html
index d03d820a3e6..74e7b9645f8 100644
--- a/tests/wpt/web-platform-tests/css/selectors/attribute-selectors/attribute-case/cssom.html
+++ b/tests/wpt/web-platform-tests/css/selectors/attribute-selectors/attribute-case/cssom.html
@@ -24,9 +24,11 @@ var tests = [
   ['[foo="bar" i]', '[foo="bar" i]'],
   ['[foo="bar" /**/ i]', '[foo="bar" i]'],
   ['[foo="bar"/**/i]', '[foo="bar" i]'],
+  ['[*|foo="bar" i]', '[*|foo="bar" i]'],
   ['[foo="bar" s]', '[foo="bar" s]'],
   ['[foo="bar" /**/ s]', '[foo="bar" s]'],
   ['[foo="bar"/**/s]', '[foo="bar" s]'],
+  ['[*|foo="bar" s]', '[*|foo="bar" s]'],
 ]
 
 tests.forEach(function(arr) {
diff --git a/tests/wpt/web-platform-tests/fetch/api/headers/headers-no-cors.window.js b/tests/wpt/web-platform-tests/fetch/api/headers/headers-no-cors.window.js
index ebf0142e280..9ea76e03e13 100644
--- a/tests/wpt/web-platform-tests/fetch/api/headers/headers-no-cors.window.js
+++ b/tests/wpt/web-platform-tests/fetch/api/headers/headers-no-cors.window.js
@@ -7,6 +7,10 @@ const longValue = "s".repeat(127);
     "headers": ["accept", "accept-language", "content-language"],
     "values": [longValue, "", longValue]
   },
+  {
+    "headers": ["accept", "accept-language", "content-language"],
+    "values": ["", longValue]
+  },
   {
     "headers": ["content-type"],
     "values": ["text/plain;" + "s".repeat(116), "text/plain"]
@@ -17,10 +21,10 @@ const longValue = "s".repeat(127);
       const noCorsHeaders = new Request("about:blank", { mode: "no-cors" }).headers;
       testItem.values.forEach((value) => {
         noCorsHeaders.append(header, value);
-        assert_equals(noCorsHeaders.get(header), testItem.values[0]);
+        assert_equals(noCorsHeaders.get(header), testItem.values[0], '1');
       });
-      noCorsHeaders.set(header, values.join(", "));
-      assert_equals(noCorsHeaders.get(header), testItem.values[0]);
+      noCorsHeaders.set(header, testItem.values.join(", "));
+      assert_equals(noCorsHeaders.get(header), testItem.values[0], '2');
       noCorsHeaders.delete(header);
       assert_false(noCorsHeaders.has(header));
     }, "\"no-cors\" Headers object cannot have " + header + " set to " + testItem.values.join(", "));
diff --git a/tests/wpt/web-platform-tests/html/syntax/parsing/quotes-in-meta.html b/tests/wpt/web-platform-tests/html/syntax/parsing/quotes-in-meta.html
new file mode 100644
index 00000000000..3d1eaf02a20
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/syntax/parsing/quotes-in-meta.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<meta http-equiv="Content-Type" content='charset="windows-1251'>
+<meta charset=windows-1250>
+<title></title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<link rel=help href="https://html.spec.whatwg.org/#algorithm-for-extracting-a-character-encoding-from-a-meta-element">
+<script>
+test(function() {
+    assert_equals(document.characterSet, "windows-1250");
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
index b2bf38e9fd4..cf07738b8b4 100644
--- a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
@@ -239,7 +239,7 @@ dictionary RTCTransportStats : RTCStats {
 dictionary RTCIceCandidateStats : RTCStats {
              DOMString transportId;
              RTCNetworkType networkType;
-             DOMString address;
+             DOMString? address;
              long port;
              DOMString protocol;
              RTCIceCandidateType candidateType;
diff --git a/tests/wpt/web-platform-tests/resource-timing/single-entry-per-resource.html b/tests/wpt/web-platform-tests/resource-timing/single-entry-per-resource.html
index 39d7d5b2566..1f8f4005e42 100644
--- a/tests/wpt/web-platform-tests/resource-timing/single-entry-per-resource.html
+++ b/tests/wpt/web-platform-tests/resource-timing/single-entry-per-resource.html
@@ -13,6 +13,11 @@
     function (entryList, obs) {
       var entries = entryList.getEntriesByType("resource");
       for (var i = 0; i < entries.length; ++i) {
+        // Ignore any entries for the test harness files if present.
+        if (/testharness(report)?\.js/.test(entries[i].name)) {
+          continue;
+        }
+
         ++observed;
         if (entries[i].name.indexOf(img_url) != -1)
             ++img_entries;
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/resources/import-relative.xsl b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/import-relative.xsl
new file mode 100644
index 00000000000..063a62d0314
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/import-relative.xsl
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+    <xsl:import href="xslt-pass.xsl"/>
+</xsl:stylesheet>
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-iframe.xml b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-iframe.xml
new file mode 100644
index 00000000000..065a07acb28
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-iframe.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/xsl" href="resources/request-url-path/import-relative.xsl"?>
+<stylesheet-test>
+This tests a stylesheet which has a xsl:import with a relative URL.
+</stylesheet-test>
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-worker.js b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-worker.js
new file mode 100644
index 00000000000..50e2b1842ff
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xsl-base-url-worker.js
@@ -0,0 +1,12 @@
+self.addEventListener('fetch', event => {
+  const url = new URL(event.request.url);
+
+  // For the import-relative.xsl file, respond in a way that changes the
+  // response URL. This is expected to change the base URL and allow the import
+  // from the file to succeed.
+  const path = 'request-url-path/import-relative.xsl';
+  if (url.pathname.indexOf(path) != -1) {
+    // Respond with a different URL, deleting "request-url-path/".
+    event.respondWith(fetch('import-relative.xsl'));
+  }
+});
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xslt-pass.xsl b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xslt-pass.xsl
new file mode 100644
index 00000000000..2cd7f2f8f86
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/xslt-pass.xsl
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+  <xsl:template match="/">
+    <html>
+      <body>
+           <p>PASS</p>
+      </body>
+    </html>
+  </xsl:template>
+</xsl:stylesheet>
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/xsl-base-url.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/xsl-base-url.https.html
new file mode 100644
index 00000000000..1d3c36408a6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/xsl-base-url.https.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Service Worker: XSL's base URL must be the response URL</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helpers.sub.js?pipe=sub"></script>
+<script>
+// This test loads an XML document which is controlled a service worker. The
+// document loads a stylesheet and a service worker responds with another URL.
+// The stylesheet imports a relative URL to test that the base URL is the
+// response URL from the service worker.
+promise_test(async (t) => {
+  const SCOPE = 'resources/xsl-base-url-iframe.xml';
+  const SCRIPT = 'resources/xsl-base-url-worker.js';
+  let worker;
+  let frame;
+
+  t.add_cleanup(() => {
+    if (frame)
+      frame.remove();
+    service_worker_unregister(t, SCOPE);
+  });
+
+  const registration = await service_worker_unregister_and_register(
+      t, SCRIPT, SCOPE);
+  worker = registration.installing;
+  await wait_for_state(t, worker, 'activated');
+
+  frame = await with_iframe(SCOPE);
+  assert_equals(frame.contentDocument.body.textContent, 'PASS');
+}, 'base URL when service worker does respondWith(fetch(responseUrl))');
+</script>
diff --git a/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/properties.svg b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/properties.svg
index b92a6d1d15b..dd198f177df 100644
--- a/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/properties.svg
+++ b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/properties.svg
@@ -25,9 +25,9 @@
     var first = document.getElementById('first');
     assert_equals(getComputedStyle(first).x, "0px");
     assert_equals(getComputedStyle(first).y, "0px");
-    assert_equals(getComputedStyle(first).width, "auto");
-    assert_equals(getComputedStyle(first).height, "auto");
-  }, 'width and height default to auto');
+    assert_equals(getComputedStyle(first).width, "0px");
+    assert_equals(getComputedStyle(first).height, "0px");
+  }, 'width and height default to auto (which computes to "0px")');
 
   test(function() {
     var second = document.getElementById('second');
diff --git a/tests/wpt/web-platform-tests/svg/geometry/parsing/height-computed.svg b/tests/wpt/web-platform-tests/svg/geometry/parsing/height-computed.svg
new file mode 100644
index 00000000000..bcc1f9d0e11
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/geometry/parsing/height-computed.svg
@@ -0,0 +1,130 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Geometry Properties: getComputedStyle().height</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/geometry.html#Sizing"/>
+    <h:link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values"/>
+  </metadata>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <svg width="200" height="100" id="test-content">
+    <rect/>
+    <rect width="100" height="200"/>
+    <rect width="42" style="height: auto"/>
+    <rect width="42" style="height: 20px"/>
+    <rect width="42" style="height: 40%"/>
+    <rect width="42" style="height: 80%; display: none"/>
+
+    <g><rect width="100" height="100"/></g>
+    <g width="100" height="42px"><rect width="100" height="100"/></g>
+    <g style="width: 10%; height: auto"><rect width="100" height="100"/></g>
+    <g style="width: auto; height: 20px"><rect width="100" height="100"/></g>
+    <g style="width: 20px; height: 10%"><rect width="100" height="100"/></g>
+
+    <image/>
+    <image width="42" height="200"/>
+    <image width="42" style="height: auto"/>
+    <image width="42" style="height: 230px"/>
+    <image width="42" style="height: 25%"/>
+    <image width="42" style="height: 25%; display: none"/>
+
+    <foreignObject>Some content</foreignObject>
+    <foreignObject height="200">Some content</foreignObject>
+    <foreignObject style="height: auto">Some content</foreignObject>
+    <foreignObject style="height: 75px">Some content</foreignObject>
+    <foreignObject style="height: 50%">Some content</foreignObject>
+    <foreignObject style="height: auto; display: none">Some content</foreignObject>
+
+    <svg/>
+    <svg height="200"/>
+    <svg style="height: auto"/>
+    <svg style="height: 200px"/>
+    <svg style="height: 50%"/>
+    <svg style="height: auto; display: none"/>
+
+    <text>Text1</text>
+    <text width="100px" height="42">Text2</text>
+    <text style="width: 30%; height: auto">Text3</text>
+    <text style="width: auto; height: 20px">Text3</text>
+    <text style="width: 20px; height: 30%">Text3</text>
+  </svg>
+  <script><![CDATA[
+[
+  // Cases where computed 'height' return the used value.
+  {
+    element: 'rect',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '200px', description: 'presentation attribute' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+      { value: '40px', description: 'inline style (percentage)' },
+      { value: '80%', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'image',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '200px', description: 'presentation attribute' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '230px', description: 'inline style (pixels)' },
+      { value: '25px', description: 'inline style (percentage)' },
+      { value: '25%', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'foreignObject',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '200px', description: 'presentation attribute' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '75px', description: 'inline style (pixels)' },
+      { value: '50px', description: 'inline style (percentage)' },
+      { value: 'auto', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'svg',
+    expected: [
+      { value: '100px', description: 'initial' },
+      { value: '200px', description: 'presentation attribute' },
+      { value: '100px', description: 'inline style (auto)' },
+      { value: '200px', description: 'inline style (pixels)' },
+      { value: '50px', description: 'inline style (percentage)' },
+      { value: 'auto', description: 'inline style but "display: none"' },
+    ]
+  },
+
+  // Cases where computed 'height' return the computed value.
+  {
+    element: 'g',
+    expected: [
+      { value: 'auto', description: 'initial' },
+      { value: 'auto', description: 'initial (with dummy attribute)' },
+      { value: 'auto', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+      { value: '10%', description: 'inline style (percentage)' },
+    ]
+  },
+  {
+    element: 'text',
+    expected: [
+      { value: 'auto', description: 'initial' },
+      { value: 'auto', description: 'initial (with dummy attribute)' },
+      { value: 'auto', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+      { value: '30%', description: 'inline style (percentage)' },
+    ]
+  },
+].forEach(function(entry) {
+  let element_set = document.querySelectorAll('#test-content > ' + entry.element);
+  entry.expected.forEach(function(expected, index) {
+    test(function() {
+      let style = getComputedStyle(element_set[index]);
+      assert_equals(style.height, expected.value, expected.description);
+    }, document.title + ', <' + entry.element + '> ' + expected.description);
+  });
+});
+  ]]></script>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/geometry/parsing/width-computed.svg b/tests/wpt/web-platform-tests/svg/geometry/parsing/width-computed.svg
new file mode 100644
index 00000000000..1af3de12347
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/geometry/parsing/width-computed.svg
@@ -0,0 +1,130 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Geometry Properties: getComputedStyle().width</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/geometry.html#Sizing"/>
+    <h:link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values"/>
+  </metadata>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <svg width="200" height="100" id="test-content">
+    <rect/>
+    <rect width="100" height="200"/>
+    <rect height="42" style="width: 40%"/>
+    <rect height="42" style="width: auto"/>
+    <rect height="42" style="width: 20px"/>
+    <rect height="42" style="width: 42%; display: none"/>
+
+    <g><rect width="100" height="100"/></g>
+    <g width="100" height="42px"><rect width="100" height="100"/></g>
+    <g style="width: 10%; height: auto"><rect width="100" height="100"/></g>
+    <g style="width: auto; height: 20px"><rect width="100" height="100"/></g>
+    <g style="width: 20px; height: 10%"><rect width="100" height="100"/></g>
+
+    <image/>
+    <image width="100"/>
+    <image height="42" style="width: 25%"/>
+    <image height="42" style="width: auto"/>
+    <image height="42" style="width: 230px"/>
+    <image height="42" style="width: 25%; display: none"/>
+
+    <foreignObject>Some content</foreignObject>
+    <foreignObject width="100">Some content</foreignObject>
+    <foreignObject style="width: 50%">Some content</foreignObject>
+    <foreignObject style="width: auto">Some content</foreignObject>
+    <foreignObject style="width: 75px">Some content</foreignObject>
+    <foreignObject style="width: auto; display: none">Some content</foreignObject>
+
+    <svg/>
+    <svg width="100"/>
+    <svg style="width: auto"/>
+    <svg style="width: 200px"/>
+    <svg style="width: 50%"/>
+    <svg style="width: auto; display: none"/>
+
+    <text>Text1</text>
+    <text width="100px" height="42">Text2</text>
+    <text style="width: 30%; height: auto">Text3</text>
+    <text style="width: auto; height: 20px">Text3</text>
+    <text style="width: 20px; height: 30%">Text3</text>
+  </svg>
+  <script><![CDATA[
+[
+  // Cases where computed 'width' return the used value.
+  {
+    element: 'rect',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '100px', description: 'presentation attribute' },
+      { value: '80px', description: 'inline style (percentage)' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+      { value: '42%', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'image',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '100px', description: 'presentation attribute' },
+      { value: '50px', description: 'inline style (percentage)' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '230px', description: 'inline style (pixels)' },
+      { value: '25%', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'foreignObject',
+    expected: [
+      { value: '0px', description: 'initial' },
+      { value: '100px', description: 'presentation attribute' },
+      { value: '100px', description: 'inline style (percentage)' },
+      { value: '0px', description: 'inline style (auto)' },
+      { value: '75px', description: 'inline style (pixels)' },
+      { value: 'auto', description: 'inline style but "display: none"' },
+    ]
+  },
+  {
+    element: 'svg',
+    expected: [
+      { value: '200px', description: 'initial' },
+      { value: '100px', description: 'presentation attribute' },
+      { value: '200px', description: 'inline style (auto)' },
+      { value: '200px', description: 'inline style (pixels)' },
+      { value: '100px', description: 'inline style (percentage)' },
+      { value: 'auto', description: 'inline style but "display: none"' },
+    ]
+  },
+
+  // Cases where computed 'width' return the computed value.
+  {
+    element: 'g',
+    expected: [
+      { value: 'auto', description: 'initial' },
+      { value: 'auto', description: 'initial (with dummy attribute)' },
+      { value: '10%', description: 'inline style (percentage)' },
+      { value: 'auto', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+    ]
+  },
+  {
+    element: 'text',
+    expected: [
+      { value: 'auto', description: 'initial' },
+      { value: 'auto', description: 'initial (with dummy attribute)' },
+      { value: '30%', description: 'inline style (percentage)' },
+      { value: 'auto', description: 'inline style (auto)' },
+      { value: '20px', description: 'inline style (pixels)' },
+    ]
+  },
+].forEach(function(entry) {
+  let element_set = document.querySelectorAll('#test-content > ' + entry.element);
+  entry.expected.forEach(function(expected, index) {
+    test(function() {
+      let style = getComputedStyle(element_set[index]);
+      assert_equals(style.width, expected.value, expected.description);
+    }, document.title + ', <' + entry.element + '> ' + expected.description);
+  });
+});
+  ]]></script>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/pservers/parsing/stop-color-computed.svg b/tests/wpt/web-platform-tests/svg/pservers/parsing/stop-color-computed.svg
new file mode 100644
index 00000000000..b05a69f10b9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/pservers/parsing/stop-color-computed.svg
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Paint Servers: getComputedStyle().stopColor</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/pservers.html#StopColorProperty"/>
+    <h:link rel="help" href="https://drafts.csswg.org/css-color/#resolve-color-values"/>
+    <h:link rel="help" href="https://drafts.csswg.org/cssom/#serializing-css-values"/>
+  </metadata>
+  <g id="target" style="color: blue"></g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+test_computed_value("stop-color", "currentcolor", "rgb(0, 0, 255)");
+test_computed_value("stop-color", "white", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "transparent", "rgba(0, 0, 0, 0)");
+test_computed_value("stop-color", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "#ffffff", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "rgba(255, 255, 255, 1.0)", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "rgba(255, 255, 255, 0.4)");
+test_computed_value("stop-color", "hsl(0deg, 100%, 100%)", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "hsla(0deg, 100%, 100%, 1.0)", "rgb(255, 255, 255)");
+test_computed_value("stop-color", "hsla(0deg, 100%, 100%, 0.4)", "rgba(255, 255, 255, 0.4)");
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/pservers/reftests/reference/green-100x100.svg b/tests/wpt/web-platform-tests/svg/pservers/reftests/reference/green-100x100.svg
new file mode 100644
index 00000000000..120941444a4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/pservers/reftests/reference/green-100x100.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <rect width="100" height="100" fill="green"/>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg b/tests/wpt/web-platform-tests/svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg
new file mode 100644
index 00000000000..da0a05dd879
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/pservers/reftests/stop-color-currentcolor-dynamic-001.svg
@@ -0,0 +1,18 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml"
+     style="color: red">
+  <title>stop-color: Dynamically changing 'color' for a gradient with a stop with 'currentcolor'</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/pservers.html#StopColorProperty"/>
+  <h:link rel="match" href="reference/green-100x100.svg"/>
+  <linearGradient id="g">
+    <stop stop-color="currentcolor"/>
+  </linearGradient>
+  <rect width="50" height="100" fill="url(#g)"/>
+  <rect width="50" height="100" x="50" fill="currentcolor"/>
+  <script>
+    <![CDATA[
+      let root = document.querySelector(':root');
+      root.getBoundingClientRect();  // Force layout
+      root.style.color = 'green';
+    ]]>
+  </script>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/pservers/scripted/stop-color-inheritance-currentcolor.svg b/tests/wpt/web-platform-tests/svg/pservers/scripted/stop-color-inheritance-currentcolor.svg
new file mode 100644
index 00000000000..22bf513c862
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/pservers/scripted/stop-color-inheritance-currentcolor.svg
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml"
+     color="red">
+  <title>SVG Paint Servers: 'stop-color' inheritance of 'currentcolor'</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/pservers.html#StopColorProperty"/>
+    <h:link rel="help" href="https://drafts.csswg.org/css-color/#resolve-color-values"/>
+  </metadata>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <linearGradient stop-color="currentcolor" id="g">
+    <stop stop-color="inherit" color="green"/>
+  </linearGradient>
+  <script><![CDATA[
+
+    test(function() {
+      let stop = document.querySelector('stop');
+      assert_equals(getComputedStyle(stop).stopColor, 'rgb(0, 128, 0)');
+    }, '"currentcolor" is inherited as a keyword');
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
index 666db37ac1a..e38f4dea670 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_sauce.txt
@@ -1,3 +1,3 @@
 mozprocess == 0.26
 selenium==3.141.0
-requests==2.20.1
+requests==2.21.0
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/base.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/base.py
index 712ff3fbc9b..64137539291 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/base.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/base.py
@@ -146,15 +146,11 @@ class Browser(object):
         with which it should be instantiated"""
         return ExecutorBrowser, {}
 
-    def check_for_crashes(self):
-        """Check for crashes that didn't cause the browser process to terminate"""
+    def check_crash(self, process, test):
+        """Check if a crash occured and output any useful information to the
+        log. Returns a boolean indicating whether a crash occured."""
         return False
 
-    def log_crash(self, process, test):
-        """Return a list of dictionaries containing information about crashes that happend
-        in the browser, or an empty list if no crashes occurred"""
-        self.logger.crash(process, test)
-
 
 class NullBrowser(Browser):
     def __init__(self, logger, **kwargs):
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
index 618f011abaf..14cac17cf6d 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -397,23 +397,15 @@ class FirefoxBrowser(Browser):
         assert self.marionette_port is not None
         return ExecutorBrowser, {"marionette_port": self.marionette_port}
 
-    def check_for_crashes(self):
+    def check_crash(self, process, test):
         dump_dir = os.path.join(self.profile.profile, "minidumps")
 
-        return bool(mozcrash.check_for_crashes(dump_dir,
-                                               symbols_path=self.symbols_path,
-                                               stackwalk_binary=self.stackwalk_binary,
-                                               quiet=True))
-
-    def log_crash(self, process, test):
-        dump_dir = os.path.join(self.profile.profile, "minidumps")
-
-        mozcrash.log_crashes(self.logger,
-                             dump_dir,
-                             symbols_path=self.symbols_path,
-                             stackwalk_binary=self.stackwalk_binary,
-                             process=process,
-                             test=test)
+        return bool(mozcrash.log_crashes(self.logger,
+                                         dump_dir,
+                                         symbols_path=self.symbols_path,
+                                         stackwalk_binary=self.stackwalk_binary,
+                                         process=process,
+                                         test=test))
 
     def setup_ssl(self):
         """Create a certificate database to use in the test profile. This is configured
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_marionette.js b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_marionette.js
index 61f894f8760..194e192c2f4 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_marionette.js
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_marionette.js
@@ -13,7 +13,7 @@ var observer = new MutationObserver(test);
 observer.observe(root, {attributes: true});
 
 if (document.readyState != "complete") {
-  onload = test
+  addEventListener('load', test);
 } else {
   test();
 }
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_webdriver.js b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_webdriver.js
index c1cc649e323..a7486b6594d 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_webdriver.js
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/reftest-wait_webdriver.js
@@ -38,7 +38,7 @@ var observer = new MutationObserver(root_wait);
 observer.observe(root, {attributes: true});
 
 if (document.readyState != "complete") {
-    onload = root_wait;
+    addEventListener('load', root_wait);
 } else {
     root_wait();
 }
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testharnessreport.js b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testharnessreport.js
index 281f97ddaa6..29fc0e98731 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testharnessreport.js
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testharnessreport.js
@@ -1,5 +1,20 @@
+class MessageQueue {
+  constructor() {
+    this._queue = [];
+  }
+
+  push(item) {
+    this._queue.push(item);
+    __wptrunner_process_next_event();
+  }
+
+  shift() {
+    return this._queue.shift();
+  }
+}
+
 window.__wptrunner_testdriver_callback = null;
-window.__wptrunner_message_queue = [];
+window.__wptrunner_message_queue = new MessageQueue();
 window.__wptrunner_url = null;
 
 window.__wptrunner_process_next_event = function() {
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testloader.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testloader.py
index a395a50a45c..f8849ebe75e 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testloader.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testloader.py
@@ -404,7 +404,7 @@ class ManifestLoader(object):
             download_from_github(manifest_path, tests_path)
         return manifest.load_and_update(tests_path, manifest_path, url_base,
                                         cache_root=cache_root, update=self.force_manifest_update,
-                                        meta_filters=self.meta_filters)
+                                        meta_filters=self.meta_filters, types=self.types)
 
 
 def iterfilter(filters, iter):
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 e819f242e2d..d3a62646278 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
@@ -233,11 +233,8 @@ class BrowserManager(object):
         if self.init_timer is not None:
             self.init_timer.cancel()
 
-    def check_for_crashes(self):
-        return self.browser.check_for_crashes()
-
-    def log_crash(self, test_id):
-        return self.browser.log_crash(process=self.browser_pid, test=test_id)
+    def check_crash(self, test_id):
+        return self.browser.check_crash(process=self.browser_pid, test=test_id)
 
     def is_alive(self):
         return self.browser.is_alive()
@@ -504,8 +501,7 @@ class TestRunnerManager(threading.Thread):
 
     def init_failed(self):
         assert isinstance(self.state, RunnerManagerState.initializing)
-        if self.browser.check_for_crashes():
-            self.browser.log_crash(None)
+        self.browser.check_crash(None)
         self.browser.after_init()
         self.stop_runner(force=True)
         return RunnerManagerState.initializing(self.state.test,
@@ -580,7 +576,7 @@ class TestRunnerManager(threading.Thread):
         expected = test.expected()
         status = status_subns.get(file_result.status, file_result.status)
 
-        if self.browser.check_for_crashes():
+        if self.browser.check_crash(test.id):
             status = "CRASH"
 
         self.test_count += 1
@@ -588,8 +584,6 @@ class TestRunnerManager(threading.Thread):
         if is_unexpected:
             self.unexpected_count += 1
             self.logger.debug("Unexpected count in this thread %i" % self.unexpected_count)
-        if status == "CRASH":
-            self.browser.log_crash(test.id)
 
         if "assertion_count" in file_result.extra:
             assertion_count = file_result.extra.pop("assertion_count")
diff --git a/tests/wpt/web-platform-tests/user-timing/mark-measure-feature-detection.html b/tests/wpt/web-platform-tests/user-timing/mark-measure-feature-detection.html
new file mode 100644
index 00000000000..6f1ad489e95
--- /dev/null
+++ b/tests/wpt/web-platform-tests/user-timing/mark-measure-feature-detection.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>User Timing: L2 vs L3 feature detection</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  test(() => {
+    // Feature detection for PerformanceMark.
+    assert_equals(typeof(PerformanceMark.prototype), "object");
+    // Test for UserTiming L3.
+    if (PerformanceMark.prototype.hasOwnProperty('detail')) {
+      assert_equals(typeof(performance.mark("mark")), "object",
+        "performance.mark should return an object in UserTiming L3.");
+    }
+    // Test for UserTiming L2.
+    else {
+      assert_equals(typeof(performance.mark("mark")), "undefined",
+        "performance.mark should be void in UserTiming L2.");
+    }
+  }, "Test PerformanceMark existence and feature detection");
+
+  test(() => {
+    // Feature detection for PerformanceMeasure.
+    assert_equals(typeof(PerformanceMeasure.prototype), "object");
+    // Test for UserTiming L3.
+    if (PerformanceMeasure.prototype.hasOwnProperty('detail')) {
+      assert_equals(typeof(performance.measure("measure")), "object",
+        "performance.measure should return an object in UserTiming L3.");
+    }
+    // Test for UserTiming L2.
+    else {
+      assert_equals(typeof(performance.measure("measure")), "undefined",
+        "performance.measure should be void in UserTiming L2.");
+    }
+  }, "Test PerformanceMeasure existence and feature detection");
+</script>
diff --git a/tests/wpt/web-platform-tests/user-timing/mark-measure-return-null.html b/tests/wpt/web-platform-tests/user-timing/mark-measure-return-null.html
deleted file mode 100644
index 5afd9633f24..00000000000
--- a/tests/wpt/web-platform-tests/user-timing/mark-measure-return-null.html
+++ /dev/null
@@ -1,46 +0,0 @@
-<!DOCTYPE HTML>
-<meta charset=utf-8>
-<title>User Timing: L2 APIs return null</title>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<p>User Timing: L2 APIs return null</p>
-<div id="log"></div>
-<script>
-  async_test(function (t) {
-    self.performance.clearMeasures();
-    const measure = self.performance.measure("measure1");
-    assert_equals(measure, null);
-    t.done();
-  }, "L2: performance.measure(name) should return null.");
-
-  async_test(function (t) {
-    self.performance.clearMeasures();
-    self.performance.mark("1");
-    const measure = self.performance.measure("measure2", 1);
-    assert_equals(measure, null);
-    t.done();
-  }, "L2: performance.measure(name, param1) should return null.");
-
-  async_test(function (t) {
-    self.performance.clearMeasures();
-    self.performance.mark("1");
-    self.performance.mark("2");
-    const measure = self.performance.measure("measure3", 1, 2);
-    assert_equals(measure, null);
-    t.done();
-  }, "L2: performance.measure(name, param1, param2) should return null.");
-
-  async_test(function (t) {
-    self.performance.clearMarks();
-    const mark = self.performance.mark("mark1");
-    assert_equals(mark, null);
-    t.done();
-  }, "L2: performance.mark(name) should return null.");
-
-  async_test(function (t) {
-    self.performance.clearMarks();
-    const mark = self.performance.mark("mark2", { startTime: 34 });
-    assert_equals(mark, null);
-    t.done();
-  }, "L2: performance.mark(name, param) should return null.");
-</script>
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/element_clear/clear.py b/tests/wpt/web-platform-tests/webdriver/tests/element_clear/clear.py
index 5d60b991acd..a1017745f3d 100644
--- a/tests/wpt/web-platform-tests/webdriver/tests/element_clear/clear.py
+++ b/tests/wpt/web-platform-tests/webdriver/tests/element_clear/clear.py
@@ -245,9 +245,7 @@ def test_button(session):
 
 def test_button_with_subtree(session):
     """
-    Whilst an <input> is normally editable, the focusable area
-    where it is placed will default to the <button>.  I.e. if you
-    try to click <input> to focus it, you will hit the <button>.
+    Elements inside button elements are interactable.
     """
     session.url = inline("""
         <button>
@@ -257,7 +255,7 @@ def test_button_with_subtree(session):
     text_field = session.find.css("input", all=False)
 
     response = element_clear(session, text_field)
-    assert_error(response, "element not interactable")
+    assert_success(response)
 
 
 def test_contenteditable(session, add_event_listeners, tracked_events):
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-setDescription-transceiver.html b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-setDescription-transceiver.html
index 5fc957df8fb..a8056d473cd 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-setDescription-transceiver.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-setDescription-transceiver.html
@@ -238,6 +238,29 @@
     });
   }, 'setRemoteDescription(rollback) should remove newly created transceiver from transceiver list');
 
+  promise_test(async t => {
+    const pc1 = new RTCPeerConnection();
+    t.add_cleanup(() => pc1.close());
+    const pc2 = new RTCPeerConnection();
+    t.add_cleanup(() => pc2.close());
+
+    pc1.addTransceiver('audio');
+    const offer = await pc1.createOffer();
+    await pc1.setLocalDescription(offer);
+
+    assert_false(pc1.getTransceivers()[0].stopped, 'Transceiver is not stopped');
+
+    await pc2.setRemoteDescription(offer);
+    pc2.getTransceivers()[0].stop();
+    const answer = await pc2.createAnswer();
+
+    await pc1.setRemoteDescription(answer);
+
+    assert_true(pc1.getTransceivers()[0].stopped, 'Transceiver is stopped');
+    assert_equals(pc1.getReceivers().length, 0, 'getReceivers does not expose a receiver of a stopped transceiver');
+    assert_equals(pc1.getSenders().length, 0, 'getSenders does not expose a sender of a stopped transceiver');
+  }, 'setRemoteDescription should stop the transceiver if its corresponding m section is rejected');
+
   /*
     TODO
       - Steps for transceiver direction is added to tip of tree draft, but not yet
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html b/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
index aba27964896..c200271490e 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCRtpTransceiver.https.html
@@ -1175,6 +1175,8 @@
       stoppedTransceiver.receiver.track.onended = resolve;
     });
     stoppedTransceiver.stop();
+    assert_equals(pc1.getReceivers().length, 0, 'getReceivers does not expose a receiver of a stopped transceiver');
+    assert_equals(pc1.getSenders().length, 0, 'getSenders does not expose a sender of a stopped transceiver');
 
     await onended;