diff --git a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
index a9e467132440..76b398963aee 100644
--- a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: FAIL
diff --git a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
index 4c1aa18e695d..0bf3b4693726 100644
--- a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
@@ -2,14 +2,8 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
-
 
 [url-with-fetch.any.html]
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 5ee2889461a2..714f683129bb 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -205305,18 +205305,6 @@
      {}
     ]
    ],
-   "mathml/presentation-markup/direction/direction-009.html": [
-    [
-     "mathml/presentation-markup/direction/direction-009.html",
-     [
-      [
-       "/mathml/presentation-markup/direction/direction-009-ref.html",
-       "=="
-      ]
-     ],
-     {}
-    ]
-   ],
    "mathml/presentation-markup/direction/direction-010.html": [
     [
      "mathml/presentation-markup/direction/direction-010.html",
@@ -205821,6 +205809,18 @@
      {}
     ]
    ],
+   "mathml/presentation-markup/tokens/ms-001.html": [
+    [
+     "mathml/presentation-markup/tokens/ms-001.html",
+     [
+      [
+       "/mathml/presentation-markup/tokens/ms-001-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "mathml/relations/css-styling/color-001.html": [
     [
      "mathml/relations/css-styling/color-001.html",
@@ -276990,9 +276990,6 @@
    "mathml/presentation-markup/direction/direction-008-ref.html": [
     []
    ],
-   "mathml/presentation-markup/direction/direction-009-ref.html": [
-    []
-   ],
    "mathml/presentation-markup/direction/direction-010-ref.html": [
     []
    ],
@@ -277125,6 +277122,9 @@
    "mathml/presentation-markup/spaces/space-2-ref.html": [
     []
    ],
+   "mathml/presentation-markup/tokens/ms-001-ref.html": [
+    []
+   ],
    "mathml/relations/css-styling/color-001-ref.html": [
     []
    ],
@@ -278814,9 +278814,15 @@
    "portals/references/portals-rendering.html": [
     []
    ],
+   "portals/resources/blank-host.html": [
+    []
+   ],
    "portals/resources/eval-portal.html": [
     []
    ],
+   "portals/resources/open-blank-host.js": [
+    []
+   ],
    "portals/resources/portal-activate-data-portal.html": [
     []
    ],
@@ -316547,7 +316553,9 @@
    "cookies/http-state/path-tests.html": [
     [
      "cookies/http-state/path-tests.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "cookies/http-state/value-tests.html": [
@@ -324243,6 +324251,12 @@
      {}
     ]
    ],
+   "css/css-masking/animations/mask-position-interpolation.html": [
+    [
+     "css/css-masking/animations/mask-position-interpolation.html",
+     {}
+    ]
+   ],
    "css/css-masking/clip-path/interpolation.html": [
     [
      "css/css-masking/clip-path/interpolation.html",
@@ -334205,6 +334219,18 @@
      {}
     ]
    ],
+   "css/cssom-view/MediaQueryList-extends-EventTarget-interop.html": [
+    [
+     "css/cssom-view/MediaQueryList-extends-EventTarget-interop.html",
+     {}
+    ]
+   ],
+   "css/cssom-view/MediaQueryList-extends-EventTarget.html": [
+    [
+     "css/cssom-view/MediaQueryList-extends-EventTarget.html",
+     {}
+    ]
+   ],
    "css/cssom-view/MediaQueryListEvent.html": [
     [
      "css/cssom-view/MediaQueryListEvent.html",
@@ -335348,7 +335374,9 @@
    "css/cssom/idlharness.html": [
     [
      "css/cssom/idlharness.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "css/cssom/inline-style-001.html": [
@@ -337392,6 +337420,12 @@
      }
     ]
    ],
+   "dom/events/Event-dispatch-order-at-target.html": [
+    [
+     "dom/events/Event-dispatch-order-at-target.html",
+     {}
+    ]
+   ],
    "dom/events/Event-dispatch-order.html": [
     [
      "dom/events/Event-dispatch-order.html",
@@ -362151,15 +362185,15 @@
      {}
     ]
    ],
-   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html": [
+   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html": [
     [
-     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html",
+     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html",
      {}
     ]
    ],
-   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads_without_user_activation.sub.tentative.html": [
+   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads.sub.tentative.html": [
     [
-     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads_without_user_activation.sub.tentative.html",
+     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads.sub.tentative.html",
      {}
     ]
    ],
@@ -362229,17 +362263,17 @@
      {}
     ]
    ],
-   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html": [
+   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html": [
     [
-     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html",
+     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html",
      {
       "timeout": "long"
      }
     ]
    ],
-   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html": [
+   "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads.sub.tentative.html": [
     [
-     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html",
+     "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads.sub.tentative.html",
      {}
     ]
    ],
@@ -364265,6 +364299,12 @@
      {}
     ]
    ],
+   "html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html": [
+    [
+     "html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html",
+     {}
+    ]
+   ],
    "html/semantics/interactive-elements/the-summary-element/display-table-with-rt-crash.html": [
     [
      "html/semantics/interactive-elements/the-summary-element/display-table-with-rt-crash.html",
@@ -369138,6 +369178,12 @@
      {}
     ]
    ],
+   "html/webappapis/scripting/events/event-handler-handleEvent-ignored.html": [
+    [
+     "html/webappapis/scripting/events/event-handler-handleEvent-ignored.html",
+     {}
+    ]
+   ],
    "html/webappapis/scripting/events/event-handler-javascript.html": [
     [
      "html/webappapis/scripting/events/event-handler-javascript.html",
@@ -371544,6 +371590,24 @@
      {}
     ]
    ],
+   "layout-instability/clip-negative-bottom-margin.html": [
+    [
+     "layout-instability/clip-negative-bottom-margin.html",
+     {}
+    ]
+   ],
+   "layout-instability/composited-element-movement.html": [
+    [
+     "layout-instability/composited-element-movement.html",
+     {}
+    ]
+   ],
+   "layout-instability/fully-clipped-visual-rect.html": [
+    [
+     "layout-instability/fully-clipped-visual-rect.html",
+     {}
+    ]
+   ],
    "layout-instability/idlharness.window.js": [
     [
      "layout-instability/idlharness.window.html",
@@ -371561,6 +371625,24 @@
      }
     ]
    ],
+   "layout-instability/ignore-fixed-and-sticky.html": [
+    [
+     "layout-instability/ignore-fixed-and-sticky.html",
+     {}
+    ]
+   ],
+   "layout-instability/local-shift-without-viewport-shift.html": [
+    [
+     "layout-instability/local-shift-without-viewport-shift.html",
+     {}
+    ]
+   ],
+   "layout-instability/multi-clip-visual-rect.html": [
+    [
+     "layout-instability/multi-clip-visual-rect.html",
+     {}
+    ]
+   ],
    "layout-instability/observe-layout-shift.html": [
     [
      "layout-instability/observe-layout-shift.html",
@@ -371569,12 +371651,42 @@
      }
     ]
    ],
+   "layout-instability/partially-clipped-visual-rect.html": [
+    [
+     "layout-instability/partially-clipped-visual-rect.html",
+     {}
+    ]
+   ],
    "layout-instability/rtl-distance.html": [
     [
      "layout-instability/rtl-distance.html",
      {}
     ]
    ],
+   "layout-instability/shift-into-viewport.html": [
+    [
+     "layout-instability/shift-into-viewport.html",
+     {}
+    ]
+   ],
+   "layout-instability/shift-outside-viewport.html": [
+    [
+     "layout-instability/shift-outside-viewport.html",
+     {}
+    ]
+   ],
+   "layout-instability/shift-while-scrolled.html": [
+    [
+     "layout-instability/shift-while-scrolled.html",
+     {}
+    ]
+   ],
+   "layout-instability/shift-with-counterscroll.html": [
+    [
+     "layout-instability/shift-with-counterscroll.html",
+     {}
+    ]
+   ],
    "layout-instability/simple-block-movement.html": [
     [
      "layout-instability/simple-block-movement.html",
@@ -389090,6 +389202,12 @@
      }
     ]
    ],
+   "portals/about-blank-cannot-host.html": [
+    [
+     "portals/about-blank-cannot-host.html",
+     {}
+    ]
+   ],
    "portals/csp/frame-src.sub.html": [
     [
      "portals/csp/frame-src.sub.html",
@@ -459929,7 +460047,7 @@
    "support"
   ],
   ".github/workflows/epochs.yml": [
-   "78aaf16d18a43c4baaf4512d067acc3b16c75e27",
+   "a93a1e8defb4fdeeb9f7740db1cc5c520aa07e5e",
    "support"
   ],
   ".github/workflows/manifest.yml": [
@@ -492345,7 +492463,7 @@
    "testharness"
   ],
   "cookies/http-state/path-tests.html": [
-   "b30d8362252c59b318b00669c0c542c78b429594",
+   "0a4794a4c0e5b108e46e90d2f05049fcd206a6eb",
    "testharness"
   ],
   "cookies/http-state/resources/all-tests.html.py-str": [
@@ -579205,7 +579323,7 @@
    "testharness"
   ],
   "css/css-grid/parsing/grid-shorthand-valid.html": [
-   "435959af25e0f03b8f53844f907430daa3d36d97",
+   "80ee50a6e273f1f4ae1a86e6a95fcc5a984d4f10",
    "testharness"
   ],
   "css/css-grid/parsing/grid-shorthand.html": [
@@ -579269,7 +579387,7 @@
    "testharness"
   ],
   "css/css-grid/parsing/grid-template-shorthand-valid.html": [
-   "042268f334816172b077edf341b1c091196f5197",
+   "8790627f4a6d13444d9232af6bca5af172149c54",
    "testharness"
   ],
   "css/css-grid/parsing/grid-template-shorthand.html": [
@@ -581620,6 +581738,10 @@
    "e00170ed331bcbca450a4de5ef41c415cc88d2b9",
    "testharness"
   ],
+  "css/css-masking/animations/mask-position-interpolation.html": [
+   "d832048ca37b2693218d1c2891d9cb3fa8ba8609",
+   "testharness"
+  ],
   "css/css-masking/clip-path-svg-content/clip-path-clip-nested-twice.svg": [
    "269e8feed2d3c21774a7c94729c3551899ce4d92",
    "reftest"
@@ -619173,11 +619295,19 @@
    "testharness"
   ],
   "css/cssom-view/MediaQueryList-addListener-removeListener.html": [
-   "5446e48e6cfcf20d5005ecfa4f75523f61ab83e2",
+   "1144e3a78322ceb7b49056c0530835bb2301fc30",
+   "testharness"
+  ],
+  "css/cssom-view/MediaQueryList-extends-EventTarget-interop.html": [
+   "7dae2afbd723883ef2230ac47f68987ff6f03d08",
+   "testharness"
+  ],
+  "css/cssom-view/MediaQueryList-extends-EventTarget.html": [
+   "34b6ef15c052ef8140973bd4d1e52b8c91b10832",
    "testharness"
   ],
   "css/cssom-view/MediaQueryListEvent.html": [
-   "24cce3cc0973cf7478c92ce05137926ea0b78f77",
+   "0afa09f087a2de0d2d8fcf6c095688cb750f8d80",
    "testharness"
   ],
   "css/cssom-view/Screen-pixelDepth-Screen-colorDepth001.html": [
@@ -619397,7 +619527,7 @@
    "testharness"
   ],
   "css/cssom-view/matchMedia.html": [
-   "14df3d02425ddf32caa904cfcfe3d8e2fae0c803",
+   "0a94c9850c8fcc72eb01d0df929e914b71cf8a2c",
    "testharness"
   ],
   "css/cssom-view/mouseEvent.html": [
@@ -619477,7 +619607,7 @@
    "support"
   ],
   "css/cssom-view/resources/matchMedia.js": [
-   "8013699b7dee114da3313ccfba61d57e7e860e5b",
+   "8623a6597a0d88c683eaaf2cd7d7515bb0f2cd7c",
    "support"
   ],
   "css/cssom-view/screenLeftTop.html": [
@@ -620185,7 +620315,7 @@
    "testharness"
   ],
   "css/cssom/idlharness.html": [
-   "3204fb8c7e750d5b121c34ba068e070e7cbddc5a",
+   "ce13d30cfad18ca0d48298694ec2477a7d6d68b5",
    "testharness"
   ],
   "css/cssom/inline-style-001.html": [
@@ -634784,6 +634914,10 @@
    "361006a7240496e9be747faca5056fe2a62a2cff",
    "testharness"
   ],
+  "dom/events/Event-dispatch-order-at-target.html": [
+   "79673c32564cbe785858266d4737de6bd5f7bade",
+   "testharness"
+  ],
   "dom/events/Event-dispatch-order.html": [
    "ca94434595c6ee19fb0f6982f56da0d005b4586c",
    "testharness"
@@ -640061,7 +640195,7 @@
    "testharness"
   ],
   "feature-policy/feature-policy-for-sandbox/resources/helper.js": [
-   "9de8416535613fc1d46396953750cc9ab6a7990b",
+   "eec189871ff82d18c6e8a3cc86ccf9c08597ca42",
    "support"
   ],
   "feature-policy/feature-policy-for-sandbox/resources/opened_window.html": [
@@ -641977,7 +642111,7 @@
    "testharness"
   ],
   "fetch/metadata/portal.tentative.https.sub.html": [
-   "b9128944733b0301606a57087cb40c143d3cb99a",
+   "4e50b6b24b356dac6c6c7f5b7d17b7f4f01431c1",
    "testharness"
   ],
   "fetch/metadata/prefetch.tentative.https.sub.html": [
@@ -656752,11 +656886,11 @@
    "042851bbb492365e9d176aff8d678feb645f1d18",
    "testharness"
   ],
-  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html": [
-   "32409f220f0a273f165741e2d79ca60846d61648",
+  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html": [
+   "1e93cb5997df5c85a6b67d3b486ae441adfb33fd",
    "testharness"
   ],
-  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads_without_user_activation.sub.tentative.html": [
+  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads.sub.tentative.html": [
    "abd4d7c5e0d76d04cd678b00a153d5a8f10bddf7",
    "testharness"
   ],
@@ -656804,11 +656938,11 @@
    "12c4e0ca50236caacae89c76da3b81effd7b44be",
    "testharness"
   ],
-  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html": [
-   "6af49b8d78ddf2acbad9e8fb875e8250c825cd33",
+  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html": [
+   "50e28f650c74ca734f63f970e61dfea77e7ab0bd",
    "testharness"
   ],
-  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html": [
+  "html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads.sub.tentative.html": [
    "9b9246c393ec9b4ee3b9762d6d06ea65ff0ff5d1",
    "testharness"
   ],
@@ -657789,7 +657923,7 @@
    "support"
   ],
   "html/semantics/forms/form-submission-0/resources/form-submission.py": [
-   "467875453c9dc64aac51add3f4a617d941820972",
+   "b296ac44c57c658ca9e3189e9f79b0f80677acba",
    "support"
   ],
   "html/semantics/forms/form-submission-0/resources/targetted-form.js": [
@@ -657801,7 +657935,7 @@
    "testharness"
   ],
   "html/semantics/forms/form-submission-0/submit-entity-body.html": [
-   "f6f3858d4ff025cfbb2ba6b0745df51c6d39436b",
+   "be9c5f0696eda41b652c9653fee1a70a2304e8f5",
    "testharness"
   ],
   "html/semantics/forms/form-submission-0/submit-file.sub.html": [
@@ -659136,6 +659270,10 @@
    "4a3693bd2dafe710b82054bfadd8bcaa97b16db5",
    "testharness"
   ],
+  "html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html": [
+   "ab200020b4f05321d4ee7c17c4a8f11c6f5931db",
+   "testharness"
+  ],
   "html/semantics/interactive-elements/the-summary-element/display-table-with-rt-crash.html": [
    "57cc45478e03ce1cdbb755281b2f434b38582563",
    "testharness"
@@ -663312,12 +663450,16 @@
    "9b81d42ff729399d57e182abc8b8950cef503e12",
    "testharness"
   ],
+  "html/webappapis/scripting/events/event-handler-handleEvent-ignored.html": [
+   "8039bac7adc137154d92173b29e7283baf6db22c",
+   "testharness"
+  ],
   "html/webappapis/scripting/events/event-handler-javascript.html": [
    "657a37839d2f3ed78968d1f0739f8594aa391cda",
    "testharness"
   ],
   "html/webappapis/scripting/events/event-handler-onresize.html": [
-   "8686716e19ac86748a1e9988767f073e2cd3348b",
+   "0e44e7272f02513c6de0c5aecc96f09005ad7396",
    "testharness"
   ],
   "html/webappapis/scripting/events/event-handler-processing-algorithm-error/document-synthetic-errorevent.html": [
@@ -665117,7 +665259,7 @@
    "support"
   ],
   "interfaces/WebCryptoAPI.idl": [
-   "0b515fc12e701b4b20c616e2ae4ce29f50a205b6",
+   "fecb3b72d3afea791a0f0648bcefa6dc014fe330",
    "support"
   ],
   "interfaces/WebIDL.idl": [
@@ -665589,7 +665731,7 @@
    "support"
   ],
   "interfaces/web-nfc.idl": [
-   "340dab647d6c5156ada9af62b77f419063aeefa7",
+   "455720c641e69af2e68b9c9a0eb2cbd740267e26",
    "support"
   ],
   "interfaces/web-share.idl": [
@@ -666272,14 +666414,42 @@
    "dabc8068931ff3b15eb4b80481ed2102a7725a62",
    "testharness"
   ],
+  "layout-instability/clip-negative-bottom-margin.html": [
+   "2c329d9fcd66d86bf8c350c2ee419e28ef6596f4",
+   "testharness"
+  ],
+  "layout-instability/composited-element-movement.html": [
+   "c9906903358d8c2b94877f536e733320d0ada75b",
+   "testharness"
+  ],
+  "layout-instability/fully-clipped-visual-rect.html": [
+   "bfd74a2407e2d91cdb2a13b86945b040aeb6dcca",
+   "testharness"
+  ],
   "layout-instability/idlharness.window.js": [
    "7d97446a57808576722a823f604effa94bb95e76",
    "testharness"
   ],
+  "layout-instability/ignore-fixed-and-sticky.html": [
+   "1b39dc9e6e9320a7932986d3a0063b7a4e556129",
+   "testharness"
+  ],
+  "layout-instability/local-shift-without-viewport-shift.html": [
+   "37729f1c13c298b5a2d95c46b7a4f199d8943022",
+   "testharness"
+  ],
+  "layout-instability/multi-clip-visual-rect.html": [
+   "36475d4c826c11807e9c0a7fbf4457c33c92c2c0",
+   "testharness"
+  ],
   "layout-instability/observe-layout-shift.html": [
    "1c35fe2aa234c96fce8798e6a1c35362f418e6f1",
    "testharness"
   ],
+  "layout-instability/partially-clipped-visual-rect.html": [
+   "3b18b98dd93312c37b9e2f25918df50266a09243",
+   "testharness"
+  ],
   "layout-instability/resources/slow-image.py": [
    "ee7988c551f6429eea2b929af083ad30cbd5c73d",
    "support"
@@ -666292,6 +666462,22 @@
    "a6f0040e950649015119ecacc465e75303b5ff9b",
    "testharness"
   ],
+  "layout-instability/shift-into-viewport.html": [
+   "6ace93ad54c2f6b173df060e39be097eca4b6867",
+   "testharness"
+  ],
+  "layout-instability/shift-outside-viewport.html": [
+   "49242913760a76d124eac0eeb3de8bb4e8eb8a19",
+   "testharness"
+  ],
+  "layout-instability/shift-while-scrolled.html": [
+   "88eeedea87782939d0191c64f7771e7e4f8828c3",
+   "testharness"
+  ],
+  "layout-instability/shift-with-counterscroll.html": [
+   "8ad1a463443ef1b6b8b8ca06a9435157cb38a1f5",
+   "testharness"
+  ],
   "layout-instability/simple-block-movement.html": [
    "0f9257e27ce5d553d8176f084e537e47b331416e",
    "testharness"
@@ -666612,14 +666798,6 @@
    "d94a036be00f404bd4d51350a85f70c180e9c776",
    "reftest"
   ],
-  "mathml/presentation-markup/direction/direction-009-ref.html": [
-   "8b80b7e6bead29d97540896d5ac1ae14b46881f1",
-   "support"
-  ],
-  "mathml/presentation-markup/direction/direction-009.html": [
-   "c0ca31d40a82e5af2e23a4c5dee83f9e2bb593cb",
-   "reftest"
-  ],
   "mathml/presentation-markup/direction/direction-010-ref.html": [
    "4f595ed49f698a7a70392edb5e72dd1df8471368",
    "support"
@@ -667128,6 +667306,14 @@
    "f9354266a7c6c42a75519e9771eb2c61536ad8e5",
    "testharness"
   ],
+  "mathml/presentation-markup/tokens/ms-001-ref.html": [
+   "bbd42a93eedbbabb7aff8fa1aa60f5c954e48210",
+   "support"
+  ],
+  "mathml/presentation-markup/tokens/ms-001.html": [
+   "b0b03f225525ffacf1d8f73da03a3848b39e96f8",
+   "reftest"
+  ],
   "mathml/relations/css-styling/attribute-mapping-001.html": [
    "3424e8c1a8cbb775a91839db6b3951dfe869af95",
    "testharness"
@@ -680224,6 +680410,10 @@
    "29134d490f7bdfb09255e190fe91576629057c78",
    "support"
   ],
+  "portals/about-blank-cannot-host.html": [
+   "207d477697d823d6611b4d8dc6681b3e2fc90a73",
+   "testharness"
+  ],
   "portals/csp/frame-src.sub.html": [
    "34f1474d4b37f6a867b858a0bfc88e03db48153a",
    "testharness"
@@ -680269,7 +680459,7 @@
    "testharness"
   ],
   "portals/portal-activate-data.html": [
-   "38204edb2c3c2ac17aec54cedd3b6f9f6d42c698",
+   "b3b9223b5199df329e770f224161632c6ee5604a",
    "testharness"
   ],
   "portals/portal-activate-event-constructor.html": [
@@ -680301,7 +680491,7 @@
    "testharness"
   ],
   "portals/portals-activate-resolution.html": [
-   "44ccea3bc521e14f7c826f14c3e815494df65ae7",
+   "db77a990e532a3d1b88f57300094cbd60215d69d",
    "testharness"
   ],
   "portals/portals-activate-twice.html": [
@@ -680337,7 +680527,7 @@
    "testharness"
   ],
   "portals/portals-navigate-after-adoption.html": [
-   "083eeaa14821b5916fc452a8a09bfa6ed308c191",
+   "5ad30d7928a6c4eda0cbcb5afad9c29234b9a057",
    "testharness"
   ],
   "portals/portals-nested.html": [
@@ -680377,17 +680567,25 @@
    "testharness"
   ],
   "portals/portals-set-src-after-activate.html": [
-   "8da6b341840162dc7348b95cfed060c075a75135",
+   "70a16436a67f254372be5f861d83d9e9b66f895f",
    "testharness"
   ],
   "portals/references/portals-rendering.html": [
    "4a8414ab5656593811772c3728e4ee83eb034457",
    "support"
   ],
+  "portals/resources/blank-host.html": [
+   "d9f3a61eb8488ba78df7439ff612fa600ff53008",
+   "support"
+  ],
   "portals/resources/eval-portal.html": [
    "98c2013915eae38bea2b8722bb8f80378ae894a0",
    "support"
   ],
+  "portals/resources/open-blank-host.js": [
+   "f7580bd15212234c36b55a368efa0c729bd64e5b",
+   "support"
+  ],
   "portals/resources/portal-activate-data-portal.html": [
    "f57e4b196be471783316a6749a58ebd4a5b962a7",
    "support"
@@ -694233,7 +694431,7 @@
    "support"
   ],
   "resources/chromium/sms_mock.js": [
-   "bdfbc2052fa102a0e502937a610a9c64d79d1bbe",
+   "d8476cf37ad0edde630634e6821fdc68b7e69114",
    "support"
   ],
   "resources/chromium/string16.mojom.js": [
@@ -699553,7 +699751,7 @@
    "testharness"
   ],
   "sms/interceptor.https.html": [
-   "6da2d71c52a90f7d0906ea99397976cb6e1573e3",
+   "94f1951a1380290a7c30fdbf85cd512d9064b8e3",
    "testharness"
   ],
   "sms/resources/helper.js": [
@@ -699569,7 +699767,7 @@
    "testharness"
   ],
   "sms/sms_receiver.idl": [
-   "64048523f901f8509e85e4dc1ddc1f7c59ab3489",
+   "ca8cfdd798c8e7d85c8251ea08acb063fc25ae77",
    "support"
   ],
   "speech-api/META.yml": [
@@ -710417,7 +710615,7 @@
    "support"
   ],
   "tools/wptrunner/wptrunner/browsers/servodriver.py": [
-   "ea345efa44fd4ec57cde5abc90c92d998c4a6c73",
+   "2953de18174ef75d505db0b8d518fe3339f7065e",
    "support"
   ],
   "tools/wptrunner/wptrunner/browsers/webkit.py": [
diff --git a/tests/wpt/metadata/css/css-transforms/animation/perspective-interpolation.html.ini b/tests/wpt/metadata/css/css-transforms/animation/perspective-interpolation.html.ini
index 03f2f3fe9d12..1193e3dfa5c2 100644
--- a/tests/wpt/metadata/css/css-transforms/animation/perspective-interpolation.html.ini
+++ b/tests/wpt/metadata/css/css-transforms/animation/perspective-interpolation.html.ini
@@ -1,5 +1,5 @@
 [perspective-interpolation.html]
-  expected: CRASH
+  expected: ERROR
   [ perspective interpolation]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html.ini
new file mode 100644
index 000000000000..4b646ae6a9b0
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html.ini
@@ -0,0 +1,4 @@
+[MediaQueryList-extends-EventTarget-interop.html]
+  [listeners are called in order they were added, ignoring capture parameter]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/dom/events/Event-dispatch-order-at-target.html.ini b/tests/wpt/metadata/dom/events/Event-dispatch-order-at-target.html.ini
new file mode 100644
index 000000000000..38fe82e71263
--- /dev/null
+++ b/tests/wpt/metadata/dom/events/Event-dispatch-order-at-target.html.ini
@@ -0,0 +1,4 @@
+[Event-dispatch-order-at-target.html]
+  [Listeners are invoked in correct order (AT_TARGET phase)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 81b7704b14e4..7c6560d5882c 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -309,15 +309,9 @@
   [<iframe>: separate response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
@@ -327,3 +321,18 @@
   [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 8d0261f22a0a..5c0015928591 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,6 +56,6 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript; charset=windows-1252 text/javascript]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 000000000000..51f8272a6def
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
new file mode 100644
index 000000000000..385376c7321e
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_4.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
new file mode 100644
index 000000000000..16fa2c5cfc19
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
@@ -0,0 +1,4 @@
+[creating_browsing_context_test_01.html]
+  [first argument: absolute url]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
index bf50d59df415..e02f179ec250 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-innerwidth-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `innerwidth`, `innerheight`]
     expected: FAIL
 
+  [features "innerheight=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
index e150c9d848f1..23eefb8eaf96 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-screenx-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `screenx`, `screeny`]
     expected: FAIL
 
+  [features "screenx=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
index ad8840fbb68b..940516ddd336 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-top-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `top`, `left`]
     expected: FAIL
 
+  [features "top=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "top=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "top=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "left=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
index d1ed9088b2b5..9027336b4532 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-width-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `width`, `height`]
     expected: FAIL
 
+  [features "height=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "width=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
index a70e9dbad4d8..4e44584b123a 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `height`]
     expected: FAIL
 
   [features "height=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "height=/404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,width=401,: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [features "height=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=L404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
index 779531b4a989..fcaeae5336d9 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerheight`]
     expected: FAIL
 
   [features "innerheight=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerheight=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
index 7a1b258d52e7..42327fedd27b 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerwidth.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerwidth`]
     expected: FAIL
 
   [features "innerwidth=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerwidth=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
index caba4124f0b4..a8e4fe06618c 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `left`]
     expected: FAIL
 
   [features "left=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "left=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=/104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=_104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
index 9ace8a4cbdbb..64a08faf0e60 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screenx.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screenx`]
     expected: FAIL
 
   [features "screenx=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screenx=_104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=/104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
index a82bd0f981ac..4f22ef4ef29f 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screeny`]
     expected: FAIL
 
   [features "screeny=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screeny=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
index 10f617db69e0..8540f53d8d69 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-top.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `top`]
     expected: FAIL
 
   [features "top=105/5" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105*3" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105LLl" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105e-1" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105.32" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105e1" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105  " should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105^4" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "top=105.5" should set "top=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "top=/104" should NOT set "top=104"]
+    expected: TIMEOUT
+
+  [features "top=_104" should NOT set "top=104"]
+    expected: TIMEOUT
+
+  [features "top=L104" should NOT set "top=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
index 28f93ee71b5d..9d841e61bc00 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-width.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `width`]
     expected: FAIL
 
   [features "width=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,height=401,: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
index 442db3cb549a..2532dceabaca 100644
--- a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,4 +1,5 @@
 [embedded-opener-remove-frame.html]
+  expected: CRASH
   [opener and "removed" embedded documents]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 6b68e9094e40..d1ca01ebc5fd 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,4 +1,5 @@
 [supported-elements.html]
+  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
@@ -9,7 +10,7 @@
     expected: FAIL
 
   [Area element should support autofocus]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html.ini
new file mode 100644
index 000000000000..30a7275385a3
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html.ini
@@ -0,0 +1,5 @@
+[iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html]
+  expected: TIMEOUT
+  [<a download> triggered download in sandbox is allowed by allow-downloads.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html.ini
deleted file mode 100644
index 7d9c4f6072b5..000000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html]
-  expected: TIMEOUT
-  [<a download> triggered download in sandbox is allowed by allow-downloads-without-user-activation.]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html.ini
new file mode 100644
index 000000000000..c98551372ada
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html.ini
@@ -0,0 +1,5 @@
+[iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html]
+  expected: TIMEOUT
+  [Navigation resulted download in sandbox is allowed by allow-downloads.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html.ini
deleted file mode 100644
index 609b809273a5..000000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html]
-  expected: TIMEOUT
-  [Navigation resulted download in sandbox is allowed by allow-downloads-without-user-activation.]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index fc37df7e3fa1..f42f518d257d 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_escaping-1.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 9df1ac56f2ac..3f7e3e9544f1 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    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 8cc42056d34e..000000000000
--- 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/forms/form-submission-0/form-double-submit-3.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
index 941d0dee0c83..df89cd215114 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
@@ -1,5 +1,5 @@
 [form-double-submit-3.html]
   expected: ERROR
   [<button> should have the same double-submit protection as <input type=submit>]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
index 47a7bbb7975f..dce74c6dd71d 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
@@ -1,5 +1,5 @@
 [form-double-submit.html]
   expected: ERROR
   [default submit action should supersede onclick submit()]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
deleted file mode 100644
index 9e522297c94d..000000000000
--- a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[toggleEvent.html]
-  [Calling open twice on 'details' fires only one toggle event]
-    expected: FAIL
-
-  [Setting open=true to opened 'details' element should not fire a toggle event at the 'details' element]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html.ini
new file mode 100644
index 000000000000..bab4ff15d5bd
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html.ini
@@ -0,0 +1,8 @@
+[anchor-with-inline-element.html]
+  expected: TIMEOUT
+  [Clicking on anchor with embedded inline element should navigate instead of opening details]
+    expected: NOTRUN
+
+  [Expected <a> containing <i> to navigate]
+    expected: NOTRUN
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b0..a56bad443a2d 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
deleted file mode 100644
index 663a1f8fa30d..000000000000
--- a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/webmessaging/without-ports/018.html.ini b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
deleted file mode 100644
index 663a1f8fa30d..000000000000
--- a/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
new file mode 100644
index 000000000000..80f9a4f15b8a
--- /dev/null
+++ b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
@@ -0,0 +1,2 @@
+[Worker-constructor.html]
+  expected: ERROR
diff --git a/tests/wpt/web-platform-tests/.github/workflows/epochs.yml b/tests/wpt/web-platform-tests/.github/workflows/epochs.yml
index 78aaf16d18a4..a93a1e8defb4 100644
--- a/tests/wpt/web-platform-tests/.github/workflows/epochs.yml
+++ b/tests/wpt/web-platform-tests/.github/workflows/epochs.yml
@@ -7,7 +7,7 @@ on:
 jobs:
   update:
     # Do not run this job on forks.
-    if: github.repository == "web-platform-tests/wpt"
+    if: github.repository == 'web-platform-tests/wpt'
     runs-on: ubuntu-18.04
     steps:
     - name: Checkout
diff --git a/tests/wpt/web-platform-tests/cookies/http-state/path-tests.html b/tests/wpt/web-platform-tests/cookies/http-state/path-tests.html
index b30d8362252c..0a4794a4c0e5 100644
--- a/tests/wpt/web-platform-tests/cookies/http-state/path-tests.html
+++ b/tests/wpt/web-platform-tests/cookies/http-state/path-tests.html
@@ -4,6 +4,7 @@
     <meta charset=utf-8>
     <title>Tests basic cookie setting functionality</title>
     <meta name=help href="https://tools.ietf.org/html/rfc6265#page-8">
+    <meta name="timeout" content="long">
 
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-shorthand-valid.html b/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-shorthand-valid.html
index 435959af25e0..80ee50a6e273 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-shorthand-valid.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-shorthand-valid.html
@@ -14,6 +14,8 @@
 <script>
 
 // <'grid-template'> values
+test_valid_value("grid", 'none');
+test_valid_value("grid", 'none / none', 'none');
 test_valid_value("grid", 'auto / auto');
 test_valid_value("grid", 'none / [a] 0px');
 test_valid_value("grid", 'none / [] 0px', 'none / 0px');
@@ -25,6 +27,30 @@
 test_valid_value("grid", '"a" 10px');
 test_valid_value("grid", '[] "a" 10px', '"a" 10px');
 test_valid_value("grid", '[a] "a" 10px [a]');
+test_valid_value("grid", '"a"');
+test_valid_value("grid", '"a" auto', '"a"');
+test_valid_value("grid", '"a" / 10px');
+test_valid_value("grid", '"a" / 20%');
+test_valid_value("grid", '"a" / 5fr');
+test_valid_value("grid", '[a] "a"');
+test_valid_value("grid", '[a] "a" [a]');
+test_valid_value("grid", '[] "a"', '"a"');
+test_valid_value("grid", '"a" [] [] "b"', '"a" "b"');
+test_valid_value("grid", '"a" [] "b"', '"a" "b"');
+test_valid_value("grid", '"a" [a] [b] "b"', '"a" [a b] "b"');
+test_valid_value("grid", '"a" [a] "b"');
+test_valid_value("grid", '"a" / 0', '"a" / 0px');
+test_valid_value("grid", '"a" 10px / 10px');
+test_valid_value("grid", '"a" [a] "b" 10px');
+test_valid_value("grid", '"a" [a] "b" 10px [a]');
+test_valid_value("grid", '"a" [a] [a] "b" 10px', '"a" [a a] "b" 10px');
+test_valid_value("grid", '"a" [a] [] "b" 10px', '"a" [a] "b" 10px');
+test_valid_value("grid", '"a" 10px [a] "b" [a]');
+test_valid_value("grid", '"a" [a] "b" [a]');
+test_valid_value("grid", '[a] "a" [a] "b" [a]');
+test_valid_value("grid", '"a" "a" [a] "b" [a]');
+test_valid_value("grid", '"a" [a] "b" [a] / 0', '"a" [a] "b" [a] / 0px');
+test_valid_value("grid", '"a" "a" [a] [a] "b" / auto', '"a" "a" [a a] "b" / auto');
 
 // FIXME: add more values to test full syntax
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-template-shorthand-valid.html b/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-template-shorthand-valid.html
index 042268f33481..8790627f4a6d 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-template-shorthand-valid.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/parsing/grid-template-shorthand-valid.html
@@ -13,6 +13,8 @@
 <body>
 <script>
 
+test_valid_value("grid-template", 'none');
+test_valid_value("grid-template", 'none / none', 'none');
 test_valid_value("grid-template", 'auto / auto');
 test_valid_value("grid-template", 'none / [a] 0px');
 test_valid_value("grid-template", 'none / [] 0px', 'none / 0px');
@@ -24,6 +26,30 @@
 test_valid_value("grid-template", '"a" 10px');
 test_valid_value("grid-template", '[] "a" 10px', '"a" 10px');
 test_valid_value("grid-template", '[a] "a" 10px [a]');
+test_valid_value("grid-template", '"a"');
+test_valid_value("grid-template", '"a" auto', '"a"');
+test_valid_value("grid-template", '"a" / 10px');
+test_valid_value("grid-template", '"a" / 20%');
+test_valid_value("grid-template", '"a" / 5fr');
+test_valid_value("grid-template", '[a] "a"');
+test_valid_value("grid-template", '[a] "a" [a]');
+test_valid_value("grid-template", '[] "a"', '"a"');
+test_valid_value("grid-template", '"a" [] [] "b"', '"a" "b"');
+test_valid_value("grid-template", '"a" [] "b"', '"a" "b"');
+test_valid_value("grid-template", '"a" [a] [b] "b"', '"a" [a b] "b"');
+test_valid_value("grid-template", '"a" [a] "b"');
+test_valid_value("grid-template", '"a" / 0', '"a" / 0px');
+test_valid_value("grid-template", '"a" 10px / 10px');
+test_valid_value("grid-template", '"a" [a] "b" 10px');
+test_valid_value("grid-template", '"a" [a] "b" 10px [a]');
+test_valid_value("grid-template", '"a" [a] [a] "b" 10px', '"a" [a a] "b" 10px');
+test_valid_value("grid-template", '"a" [a] [] "b" 10px', '"a" [a] "b" 10px');
+test_valid_value("grid-template", '"a" 10px [a] "b" [a]');
+test_valid_value("grid-template", '"a" [a] "b" [a]');
+test_valid_value("grid-template", '[a] "a" [a] "b" [a]');
+test_valid_value("grid-template", '"a" "a" [a] "b" [a]');
+test_valid_value("grid-template", '"a" [a] "b" [a] / 0', '"a" [a] "b" [a] / 0px');
+test_valid_value("grid-template", '"a" "a" [a] [a] "b" / auto', '"a" "a" [a a] "b" / auto');
 
 // FIXME: add more values to test full syntax
 
diff --git a/tests/wpt/web-platform-tests/css/css-masking/animations/mask-position-interpolation.html b/tests/wpt/web-platform-tests/css/css-masking/animations/mask-position-interpolation.html
new file mode 100644
index 000000000000..d832048ca37b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/animations/mask-position-interpolation.html
@@ -0,0 +1,146 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<meta charset="UTF-8">
+<title>mask-position-interpolation</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-position">
+<meta name="assert" content="mask-position supports animation">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<style>
+.container {
+  display: inline-block;
+  border: 2px solid black;
+}
+.parent {
+  mask-position: 30px 10px;
+}
+.target {
+  width: 120px;
+  height: 120px;
+  mask-position: 10px 30px;
+}
+</style>
+
+<body>
+<template id="target-template">
+  <div class="container">
+    <div class="target"></div>
+  </div>
+</template>
+<script>
+// neutral
+test_interpolation({
+  property: 'mask-position',
+  from: neutralKeyframe,
+  to: '20px 20px',
+}, [
+  {at: -0.25, expect: '7.5px 32.5px'},
+  {at: 0, expect: '10px 30px'},
+  {at: 0.25, expect: '12.5px 27.5px'},
+  {at: 0.5, expect: '15px 25px'},
+  {at: 0.75, expect: '17.5px 22.5px'},
+  {at: 1, expect: '20px 20px'},
+  {at: 1.25, expect: '22.5px 17.5px'},
+]);
+
+// initial
+test_interpolation({
+  property: 'mask-position',
+  from: 'initial',
+  to: '20px 20px',
+}, [
+  {at: -0.25, expect: 'calc(0% - 5px) calc(0% - 5px)'},
+  {at: 0, expect: '0% 0%'},
+  {at: 0.25, expect: 'calc(0% + 5px) calc(0% + 5px)'},
+  {at: 0.5, expect: 'calc(0% + 10px) calc(0% + 10px)'},
+  {at: 0.75, expect: 'calc(0% + 15px) calc(0% + 15px)'},
+  {at: 1, expect: 'calc(0% + 20px) calc(0% + 20px)'},
+  {at: 1.25, expect:'calc(0% + 25px) calc(0% + 25px)'},
+]);
+
+// inherit
+test_interpolation({
+  property: 'mask-position',
+  from: 'inherit',
+  to: '20px 20px',
+}, [
+  {at: -0.25, expect: '32.5px 7.5px'},
+  {at: 0, expect: '30px 10px'},
+  {at: 0.25, expect: '27.5px 12.5px'},
+  {at: 0.5, expect: '25px 15px'},
+  {at: 0.75, expect: '22.5px 17.5px'},
+  {at: 1, expect: '20px 20px'},
+  {at: 1.25, expect: '17.5px 22.5px'},
+]);
+
+// unset
+test_interpolation({
+  property: 'mask-position',
+  from: 'unset',
+  to: '20px 20px',
+}, [
+  {at: -0.25, expect: 'calc(0% - 5px) calc(0% - 5px)'},
+  {at: 0, expect: '0% 0%'},
+  {at: 0.25, expect: 'calc(0% + 5px) calc(0% + 5px)'},
+  {at: 0.5, expect: 'calc(0% + 10px) calc(0% + 10px)'},
+  {at: 0.75, expect: 'calc(0% + 15px) calc(0% + 15px)'},
+  {at: 1, expect: 'calc(0% + 20px) calc(0% + 20px)'},
+  {at: 1.25, expect:'calc(0% + 25px) calc(0% + 25px)'},
+]);
+
+// Test equal number of position values as background images.
+test_interpolation({
+  property: 'mask-position',
+  from: '0px 0px, 0px 0px, 0px 0px, 0px 0px',
+  to: '80px 80px, 80px 80px, 80px 80px, 80px 80px',
+}, [
+  {at: -0.25, expect: '-20px -20px, -20px -20px, -20px -20px, -20px -20px'},
+  {at: 0, expect:     '  0px   0px,   0px   0px,   0px   0px,   0px   0px'},
+  {at: 0.25, expect:  ' 20px  20px,  20px  20px,  20px  20px,  20px  20px'},
+  {at: 0.5, expect:   ' 40px  40px,  40px  40px,  40px  40px,  40px  40px'},
+  {at: 0.75, expect:  ' 60px  60px,  60px  60px,  60px  60px,  60px  60px'},
+  {at: 1, expect:     ' 80px  80px,  80px  80px,  80px  80px,  80px  80px'},
+  {at: 1.25, expect:  '100px 100px, 100px 100px, 100px 100px, 100px 100px'},
+]);
+
+// Test single position value repeated over background images.
+test_interpolation({
+  property: 'mask-position',
+  from: 'top 0px left 0px',
+  to: 'left 80px top 80px',
+}, [
+  {at: -0.25, expect: '-20px -20px'},
+  {at: 0, expect:     '  0px   0px'},
+  {at: 0.25, expect:  ' 20px  20px'},
+  {at: 0.5, expect:   ' 40px  40px'},
+  {at: 0.75, expect:  ' 60px  60px'},
+  {at: 1, expect:     ' 80px  80px'},
+  {at: 1.25, expect:  '100px 100px'},
+]);
+
+// Test mismatched numbers of position values.
+test_interpolation({
+  property: 'mask-position',
+  from: '0px 0px, 80px 0px',
+  to: '40px 40px, 80px 80px, 0px 80px',
+}, [
+  {at: -0.25, expect:
+    '-10px -10px, 80px -20px, 0px -20px, 90px -10px, -20px -20px, 100px -20px'},
+  {at: 0, expect:
+    '  0px   0px, 80px   0px, 0px   0px, 80px   0px,   0px   0px,  80px   0px'},
+  {at: 0.25, expect:
+    ' 10px  10px, 80px  20px, 0px  20px, 70px  10px,  20px  20px,  60px  20px'},
+  {at: 0.5, expect:
+    ' 20px  20px, 80px  40px, 0px  40px, 60px  20px,  40px  40px,  40px  40px'},
+  {at: 0.75, expect:
+    ' 30px  30px, 80px  60px, 0px  60px, 50px  30px,  60px  60px,  20px  60px'},
+  {at: 1, expect:
+    ' 40px  40px, 80px  80px, 0px  80px, 40px  40px,  80px  80px,   0px  80px'},
+  {at: 1.25, expect:
+    ' 50px  50px, 80px 100px, 0px 100px, 30px  50px, 100px 100px, -20px 100px'},
+]);
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-addListener-removeListener.html b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-addListener-removeListener.html
index 5446e48e6cfc..1144e3a78322 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-addListener-removeListener.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-addListener-removeListener.html
@@ -3,7 +3,7 @@
 <meta name="flags" content="dom">
 <title>CSS Test: CSSOM View MediaQueryList::{add,remove}Listener</title>
 <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
-<link rel="help" href="http://www.w3.org/TR/cssom-view/#the-mediaquerylist-interface">
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#the-mediaquerylist-interface">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/matchMedia.js"></script>
@@ -11,12 +11,6 @@
 <script>
 "use strict";
 
-test(function() {
-    const mql = window.matchMedia("all");
-    assert_inherits(mql, "addListener");
-    assert_equals(typeof mql.addListener, "function");
-}, "MediaQueryList::addListener is a function");
-
 promise_test(async t => {
     const iframe = await createIFrame(t, 200, 100);
     const heightMQL = iframe.contentWindow.matchMedia("(max-height: 50px)");
@@ -81,8 +75,7 @@
     triggerMQLEvent(mql);
     await waitForChangesReported();
 
-    assert_equals(calls[0], "1st");
-    assert_equals(calls[1], "2nd");
+    assert_array_equals(calls, ["1st", "2nd"]);
 }, "listeners are called in order they were added");
 
 promise_test(async t => {
@@ -102,11 +95,48 @@
     assert_equals(called, 1);
 }, "listener that was added twice is called only once");
 
-test(function() {
-    const mql = window.matchMedia("all");
-    assert_inherits(mql, "removeListener");
-    assert_equals(typeof mql.removeListener, "function");
-}, "MediaQueryList::removeListener is a function");
+promise_test(async t => {
+    const iframe = await createIFrame(t, 100);
+    const media = `(min-width: 200px)`;
+
+    const mql1 = iframe.contentWindow.matchMedia(media);
+    const mql2 = iframe.contentWindow.matchMedia(media);
+    const calls = [];
+
+    mql2.addListener(() => {
+        calls.push("mql2");
+    });
+
+    mql1.addListener(() => {
+        calls.push("mql1");
+    });
+
+    iframe.width = "200"; // 100x100 => 200x100
+    await waitForChangesReported();
+
+    assert_array_equals(calls, ["mql1", "mql2"]);
+}, "listeners are called in order their MQLs were created");
+
+promise_test(async t => {
+    const iframe = await createIFrame(t, 200);
+    const media = `(max-height: 150px)`;
+
+    const mql1 = iframe.contentWindow.matchMedia(media);
+    const mql2 = iframe.contentWindow.matchMedia(media);
+
+    let calls = 0;
+    const listener = () => {
+        calls++;
+    };
+
+    mql1.addListener(listener);
+    mql2.removeListener(listener);
+
+    iframe.height = "50"; // 200x200 => 200x50
+    await waitForChangesReported();
+
+    assert_equals(calls, 1);
+}, "removing listener from one MQL doesn't remove it from all MQLs");
 
 promise_test(async t => {
     const mql = await createMQL(t);
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html
new file mode 100644
index 000000000000..7dae2afbd723
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget-interop.html
@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name="flags" content="dom">
+<title>CSS Test: CSSOM View MediaQueryList extends EventTarget (interop)</title>
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#the-mediaquerylist-interface">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/matchMedia.js"></script>
+<div id="log"></div>
+<script>
+"use strict";
+
+test(() => {
+    const mql = window.matchMedia("all");
+
+    let receivedEvent;
+    mql.addListener(event => {
+        receivedEvent = event;
+    });
+
+    const dispatchedEvent = new Event("change");
+    mql.dispatchEvent(dispatchedEvent);
+
+    assert_equals(receivedEvent, dispatchedEvent);
+}, "dispatchEvent triggers listener added with addListener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = {
+        handleEvent() {
+            calls++;
+        },
+    };
+
+    mql.addListener(listener);
+    mql.addEventListener("change", listener);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 2, "dispatchEvent");
+}, "listener added with addListener and addEventListener is called once");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = () => {
+        calls++;
+    };
+
+    mql.addListener(listener);
+    mql.addEventListener("change", listener, true);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 2, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 4, "dispatchEvent");
+}, "listener added with addListener and addEventListener (capture) is called twice");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = {
+        handleEvent() {
+            calls++;
+        },
+    };
+
+    mql.addListener(listener);
+    mql.removeEventListener("change", listener);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 0, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 0, "dispatchEvent");
+}, "removeEventListener removes listener added with addListener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = () => {
+        calls++;
+    };
+
+    mql.addListener(listener);
+    mql.removeEventListener("change", listener, true);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 2, "dispatchEvent");
+}, "removeEventListener (capture) doesn't remove listener added with addListener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = {
+        handleEvent() {
+            calls++;
+        },
+    };
+
+    mql.addEventListener("change", listener);
+    mql.removeListener(listener);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 0, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 0, "dispatchEvent");
+}, "removeListener removes listener added with addEventListener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    const listener = () => {
+        calls++;
+    };
+
+    mql.addEventListener("change", listener, true);
+    mql.removeListener(listener);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1, "triggerMQLEvent");
+
+    mql.dispatchEvent(new Event("change"));
+    assert_equals(calls, 2, "dispatchEvent");
+}, "removeListener doesn't remove listener added with addEventListener (capture)");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = [];
+    mql.addListener(() => {
+        calls.push("addListener");
+    });
+    mql.addEventListener("change", {
+        handleEvent() {
+            calls.push("addEventListener");
+        },
+    }, true);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_array_equals(calls, ["addEventListener", "addListener"], "triggerMQLEvent");
+
+    calls = [];
+    mql.dispatchEvent(new Event("change"));
+    assert_array_equals(calls, ["addEventListener", "addListener"], "dispatchEvent");
+}, "listeners are called in order they were added, ignoring capture parameter");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget.html b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget.html
new file mode 100644
index 000000000000..34b6ef15c052
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryList-extends-EventTarget.html
@@ -0,0 +1,118 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name="flags" content="dom">
+<title>CSS Test: CSSOM View MediaQueryList extends EventTarget</title>
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#the-mediaquerylist-interface">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/matchMedia.js"></script>
+<div id="log"></div>
+<script>
+"use strict";
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let _event;
+    mql.onchange = event => {
+        _event = event;
+    };
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(_event.media, mql.media);
+    assert_equals(_event.matches, mql.matches);
+}, "onchange adds listener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    mql.onchange = () => {
+        calls++;
+    };
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1);
+
+    mql.onchange = null;
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1);
+}, "onchange removes listener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    mql.addEventListener("change", {
+        handleEvent() {
+            calls++;
+        },
+    });
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1);
+}, 'listeners for "change" type are called');
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+    mql.addEventListener("matches", t.unreached_func("should not be called"));
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+}, 'listeners with different type are not called');
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let calls = 0;
+    mql.addEventListener("change", {
+        handleEvent() {
+            calls++;
+        },
+    }, {once: true});
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+    assert_equals(calls, 1);
+}, 'addEventListener "once" option is respected');
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+    const listener = t.unreached_func("should not be called");
+
+    mql.addEventListener("change", listener);
+    mql.removeEventListener("change", listener);
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+}, "removeEventListener removes listener");
+
+test(() => {
+    const mql = window.matchMedia("all");
+
+    let receivedEvent;
+    mql.addEventListener("custom", event => {
+        receivedEvent = event;
+        event.preventDefault();
+    }, true);
+
+    const dispatchedEvent = new CustomEvent("custom", {
+        cancelable: true,
+        detail: {},
+    });
+
+    const defaultAction = mql.dispatchEvent(dispatchedEvent);
+
+    assert_equals(receivedEvent, dispatchedEvent);
+    assert_false(defaultAction);
+}, "dispatchEvent works as expected");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html
index 24cce3cc0973..0afa09f087a2 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html
@@ -2,18 +2,19 @@
 <meta charset="utf-8">
 <meta name="flags" content="dom">
 <title>CSS Test: CSSOM View MediaQueryListEvent</title>
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#mediaquerylistevent">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<link rel="help" href="https://drafts.csswg.org/cssom-view/#mediaquerylistevent">
+<script src="resources/matchMedia.js"></script>
 <div id="log"></div>
 <script>
 "use strict";
 
-test(t => {
+test(() => {
     assert_equals(new MediaQueryListEvent("test").type, "test");
 }, 'type can be different from "change"');
 
-test(t => {
+test(() => {
     const event = new MediaQueryListEvent("change");
 
     assert_equals(event.media, "");
@@ -22,7 +23,7 @@
     assert_false(event.cancelable);
 }, "init dictionary default values");
 
-test(t => {
+test(() => {
     const event = new MediaQueryListEvent("change", {
         media: "test",
         matches: true,
@@ -35,4 +36,55 @@
     assert_true(event.bubbles);
     assert_true(event.cancelable);
 }, "init dictionary overrides");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let _event;
+    mql.addListener(event => {
+        _event = event;
+    });
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+
+    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
+    assert_equals(_event.type, "change");
+    assert_false(_event.bubbles);
+    assert_false(_event.cancelable);
+}, "argument of addListener");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let _event;
+    mql.onchange = event => {
+        _event = event;
+    };
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+
+    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
+    assert_equals(_event.type, "change");
+    assert_false(_event.bubbles);
+    assert_false(_event.cancelable);
+}, "argument of onchange");
+
+promise_test(async t => {
+    const mql = await createMQL(t);
+
+    let _event;
+    mql.addEventListener("change", event => {
+        _event = event;
+    });
+
+    triggerMQLEvent(mql);
+    await waitForChangesReported();
+
+    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
+    assert_equals(_event.type, "change");
+    assert_false(_event.bubbles);
+    assert_false(_event.cancelable);
+}, 'constructor of "change" event');
 </script>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/matchMedia.html b/tests/wpt/web-platform-tests/css/cssom-view/matchMedia.html
index 14df3d02425d..0a94c9850c8f 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/matchMedia.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/matchMedia.html
@@ -3,9 +3,9 @@
 <meta name="flags" content="dom">
 <title>CSS Test: CSSOM View matchMedia and MediaQueryList</title>
 <link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
-<link rel="help" href="http://www.w3.org/TR/cssom-view/#dom-window-matchmedia">
-<link rel="help" href="http://www.w3.org/TR/cssom-view/#the-mediaquerylist-interface">
-<link rel="help" href="http://www.w3.org/TR/cssom-1/#serializing-media-queries">
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#dom-window-matchmedia">
+<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#the-mediaquerylist-interface">
+<link rel="help" href="https://www.w3.org/TR/cssom-1/#serializing-media-queries">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/matchMedia.js"></script>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/resources/matchMedia.js b/tests/wpt/web-platform-tests/css/cssom-view/resources/matchMedia.js
index 8013699b7dee..8623a6597a0d 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/resources/matchMedia.js
+++ b/tests/wpt/web-platform-tests/css/cssom-view/resources/matchMedia.js
@@ -1,15 +1,20 @@
+"use strict";
+
+{
+// private variables are defined with `const` so they don't leak outside this block statement
 const IFRAME_DEFAULT_SIZE = "200";
 const iframes = new WeakMap();
 
-async function createMQL(t) {
+// helpers are defined with `var` so they are globally accessible
+var createMQL = async t => {
     const iframe = await createIFrame(t);
     const mql = iframe.contentWindow.matchMedia(`(max-width: ${IFRAME_DEFAULT_SIZE}px)`);
     assert_true(mql.matches, "MQL should match on newly created <iframe>");
     iframes.set(mql, iframe);
     return mql;
-}
+};
 
-function createIFrame(t, width = IFRAME_DEFAULT_SIZE, height = width) {
+var createIFrame = (t, width = IFRAME_DEFAULT_SIZE, height = width) => {
     assert_not_equals(document.body, null, "<body> element is missing");
 
     const iframe = document.createElement("iframe");
@@ -30,16 +35,24 @@ function createIFrame(t, width = IFRAME_DEFAULT_SIZE, height = width) {
 
         document.body.appendChild(iframe);
     });
-}
+};
 
-function triggerMQLEvent(mql) {
+var triggerMQLEvent = mql => {
     const iframe = iframes.get(mql);
     assert_not_equals(iframe, undefined, "Passed MQL instance was not created with createMQL");
     iframe.width = iframe.width === IFRAME_DEFAULT_SIZE ? "250" : IFRAME_DEFAULT_SIZE;
-}
+};
 
-function waitForChangesReported() {
+var getWindow = mql => {
+    const iframe = iframes.get(mql);
+    assert_not_equals(iframe, undefined, "Passed MQL instance was not created with createMQL");
+    return iframe.contentWindow;
+};
+
+var waitForChangesReported = () => {
     return new Promise(resolve => {
         step_timeout(resolve, 75);
     });
+};
+
 }
diff --git a/tests/wpt/web-platform-tests/css/cssom/idlharness.html b/tests/wpt/web-platform-tests/css/cssom/idlharness.html
index 3204fb8c7e75..ce13d30cfad1 100644
--- a/tests/wpt/web-platform-tests/css/cssom/idlharness.html
+++ b/tests/wpt/web-platform-tests/css/cssom/idlharness.html
@@ -4,6 +4,7 @@
 <title>CSSOM automated IDL tests</title>
 <link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com">
 <link rel="help" href="https://drafts.csswg.org/cssom-1/#idl-index">
+<meta name="timeout" content="long">
 <script src=/resources/testharness.js></script>
 <script src=/resources/testharnessreport.js></script>
 <script src=/resources/WebIDLParser.js></script>
diff --git a/tests/wpt/web-platform-tests/dom/events/Event-dispatch-order-at-target.html b/tests/wpt/web-platform-tests/dom/events/Event-dispatch-order-at-target.html
new file mode 100644
index 000000000000..79673c32564c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/dom/events/Event-dispatch-order-at-target.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Listeners are invoked in correct order (AT_TARGET phase)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+"use strict";
+
+test(() => {
+    const el = document.createElement("div");
+    const expectedOrder = ["capturing", "bubbling"];
+
+    let actualOrder = [];
+    el.addEventListener("click", evt => {
+        assert_equals(evt.eventPhase, Event.AT_TARGET);
+        actualOrder.push("bubbling");
+    }, false);
+    el.addEventListener("click", evt => {
+        assert_equals(evt.eventPhase, Event.AT_TARGET);
+        actualOrder.push("capturing");
+    }, true);
+
+    el.dispatchEvent(new Event("click", {bubbles: true}));
+    assert_array_equals(actualOrder, expectedOrder, "bubbles: true");
+
+    actualOrder = [];
+    el.dispatchEvent(new Event("click", {bubbles: false}));
+    assert_array_equals(actualOrder, expectedOrder, "bubbles: false");
+}, "Listeners are invoked in correct order (AT_TARGET phase)");
+</script>
diff --git a/tests/wpt/web-platform-tests/feature-policy/feature-policy-for-sandbox/resources/helper.js b/tests/wpt/web-platform-tests/feature-policy/feature-policy-for-sandbox/resources/helper.js
index 9de841653561..eec189871ff8 100644
--- a/tests/wpt/web-platform-tests/feature-policy/feature-policy-for-sandbox/resources/helper.js
+++ b/tests/wpt/web-platform-tests/feature-policy/feature-policy-for-sandbox/resources/helper.js
@@ -7,7 +7,7 @@ const ignore_features_for_auxilary_context = ["popups", "scripts"];
 
 // Feature-policies that represent specific sandbox flags.
 const sandbox_features = [
-    "downloads-without-user-activation", "forms", "modals", "orientation-lock",
+    "downloads", "forms", "modals", "orientation-lock",
     "pointer-lock", "popups", "presentation", "scripts", "top-navigation"];
 
 // TODO(ekaramad): Figure out different inheritance requirements for different
diff --git a/tests/wpt/web-platform-tests/fetch/metadata/portal.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/metadata/portal.tentative.https.sub.html
index b9128944733b..4e50b6b24b35 100644
--- a/tests/wpt/web-platform-tests/fetch/metadata/portal.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/metadata/portal.tentative.https.sub.html
@@ -12,6 +12,8 @@
 
   function create_test(host, expectations) {
     async_test(t => {
+      assert_precondition("HTMLPortalElement" in window, "Portals are not supported.");
+
       let p = document.createElement('portal');
       p.addEventListener('message', t.step_func(e => {
         assert_header_equals(e.data, expectations, `{{host}} -> ${host} portal`);
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html
similarity index 86%
rename from tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html
rename to tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html
index 32409f220f0a..1e93cb5997df 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads_without_user_activation.sub.tentative.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_allow_downloads.sub.tentative.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<title>&lt;a download&gt; triggered download in sandbox is allowed by allow-downloads-without-user-activation.</title>
+<title>&lt;a download&gt; triggered download in sandbox is allowed by allow-downloads.</title>
 <link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
 <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
 <script src="/resources/testharness.js"></script>
@@ -14,7 +14,7 @@
     const token = "{{$id:uuid()}}";
     var iframe = document.createElement("iframe");
     iframe.srcdoc = "<a>Download</a>";
-    iframe.sandbox = "allow-same-origin allow-downloads-without-user-activation";
+    iframe.sandbox = "allow-same-origin allow-downloads";
     iframe.onload = t.step_func(function () {
         iframe.contentWindow.addEventListener(
             "unload", t.unreached_func("Unexpected navigation."));
@@ -26,6 +26,6 @@
     });
 
     document.body.appendChild(iframe);
-}, "<a download> triggered download in sandbox is allowed by allow-downloads-without-user-activation.");
+}, "<a download> triggered download in sandbox is allowed by allow-downloads.");
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads_without_user_activation.sub.tentative.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads.sub.tentative.html
similarity index 100%
rename from tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads_without_user_activation.sub.tentative.html
rename to tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_anchor_download_block_downloads.sub.tentative.html
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
similarity index 89%
rename from tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html
rename to tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
index 6af49b8d78dd..50e28f650c74 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<title>Navigation resulted download in sandbox is allowed by allow-downloads-without-user-activation.</title>
+<title>Navigation resulted download in sandbox is allowed by allow-downloads.</title>
 <meta name="timeout" content="long" />
 <link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
 <link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
@@ -15,7 +15,7 @@
     const token = "{{$id:uuid()}}";
     var iframe = document.createElement("iframe");
     iframe.srcdoc = "<a>Download</a>";
-    iframe.sandbox = "allow-same-origin allow-downloads-without-user-activation";
+    iframe.sandbox = "allow-same-origin allow-downloads";
     iframe.onload = t.step_func(function () {
         iframe.contentWindow.addEventListener(
             "unload", t.unreached_func("Unexpected navigation."));
@@ -29,6 +29,6 @@
     });
 
     document.body.appendChild(iframe);
-}, "Navigation resulted download in sandbox is allowed by allow-downloads-without-user-activation.");
+}, "Navigation resulted download in sandbox is allowed by allow-downloads.");
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads.sub.tentative.html
similarity index 100%
rename from tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html
rename to tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads.sub.tentative.html
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/resources/form-submission.py b/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/resources/form-submission.py
index 467875453c9d..b296ac44c57c 100644
--- a/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/resources/form-submission.py
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/resources/form-submission.py
@@ -6,5 +6,7 @@ def main(request, response):
     else:
         result = request.POST.first('foo') == 'bar'
 
+    result = result and request.url_parts.query == 'query=1'
+
     return ([("Content-Type", "text/plain")],
             "OK" if result else "FAIL")
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/submit-entity-body.html b/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/submit-entity-body.html
index f6f3858d4ff0..be9c5f0696ed 100644
--- a/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/submit-entity-body.html
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/submit-entity-body.html
@@ -96,7 +96,7 @@
   var testframe = document.getElementById("testframe");
   var testdocument = testframe.contentWindow.document;
   testdocument.body.innerHTML =
-    "<form id=testform method=post action=\"/html/semantics/forms/form-submission-0/resources/form-submission.py\" enctype=\"" + test_obj.enctype + "\">" +
+    "<form id=testform method=post action=\"/html/semantics/forms/form-submission-0/resources/form-submission.py?query=1\" enctype=\"" + test_obj.enctype + "\">" +
     test_obj.input +
     test_obj.submitelement +
     "</form>";
diff --git a/tests/wpt/web-platform-tests/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html b/tests/wpt/web-platform-tests/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html
new file mode 100644
index 000000000000..ab200020b4f0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/interactive-elements/the-summary-element/anchor-with-inline-element.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>summary element: clicking on anchor containing inline element</title>
+<link rel="author" title="Yu Han" href="mailto:yuzhehan@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/C/#the-summary-element">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-a-element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<details id="details_i">
+  <summary>Anchor text is wrapped with &lt;i&gt; tag <a href="#with_i_tag"><i id="with_i">permalink</i></a></summary>
+  <p>asdf</p>
+</details>
+
+<details id="details_span">
+  <summary>This one uses &lt;span&gt;. <a href="#with_span_tag"><span id="with_span">permalink</span></a></summary>
+  <p>asdf</p>
+</details>
+
+<details id="details_svg">
+  <summary>
+    <svg style="width: 100px;" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
+      <a href="#inside_svg_w_circle">
+        <circle id="svg_circle" cx="50" cy="40" r="35"/>
+      </a>
+      <a href="#inside_svg_w_text">
+        <text id="svg_text" x="50" y="90" text-anchor="middle">
+          &lt;circle&gt;
+        </text>
+      </a>
+    </svg>
+  </summary>
+  <p>asdf</p>
+</details>
+
+<script>
+function testClickingOnInlineElement(detailsId, targetId, expected, testName) {
+  const details = document.getElementById(detailsId);
+  const target = document.getElementById(targetId);
+  const test = async_test(testName);
+
+  const promise = new Promise((resolve, reject) => {
+    window.onhashchange = test.step_func_done(() => {
+      assert_false(details.open);
+      assert_true(location.hash === expected);
+      resolve();
+    });
+  });
+
+  if (target.click) {
+    target.click();
+  }
+  else {
+    // svg element don't have click method
+    target.dispatchEvent(new MouseEvent('click', {
+      view: window,
+      bubbles: true,
+      cancelable: true
+    }));
+  }
+  return promise;
+};
+
+async function testAll() {
+  try {
+    await testClickingOnInlineElement("details_i", "with_i", "#with_i_tag", "Expected <a> containing <i> to navigate");
+    await testClickingOnInlineElement("details_span", "with_span", "#with_span_tag", "Expected <a> containing <span> to navigate");
+    await testClickingOnInlineElement("details_svg", "svg_circle", "#inside_svg_w_circle", "Expected <a>, inside svg, containing <circle> to navigate");
+    await testClickingOnInlineElement("details_svg", "svg_text", "#inside_svg_w_text", "Expected <a>, inside svg, containing <text> to navigate");
+  } catch (exception) {
+    assert_unreached("should NOT-THROW exception");
+  }
+};
+
+var allTests = async_test("Clicking on anchor with embedded inline element should navigate instead of opening details");
+testAll().then(()=>{ allTests.done(); });
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-handleEvent-ignored.html b/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-handleEvent-ignored.html
new file mode 100644
index 000000000000..8039bac7adc1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-handleEvent-ignored.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>"handleEvent" property of EventHandler should be ignored</title>
+<link rel="help" href="https://html.spec.whatwg.org/#eventhandler">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+"use strict";
+
+test(t => {
+  const handler = Object.create(null, {
+    handleEvent: {
+      get: t.unreached_func('"handleEvent" property should not be looked up'),
+    },
+  });
+
+  const el = document.createElement("div");
+  el.onmouseenter = handler;
+  el.dispatchEvent(new MouseEvent("mouseenter"));
+}, 'plain object "mouseenter" handler');
+
+async_test(t => {
+  const handler = Object.create(Function.prototype, {
+    handleEvent: {
+      get: t.unreached_func('"handleEvent" property should not be looked up'),
+    },
+  });
+  assert_true(handler instanceof Function);
+
+  window.onmessage = handler;
+  window.postMessage({}, "*");
+
+  step_timeout(() => {
+    t.done();
+  }, 50);
+}, 'non-callable "message" handler that is instance of Function');
+</script>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-onresize.html b/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-onresize.html
index 8686716e19ac..0e44e7272f02 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-onresize.html
+++ b/tests/wpt/web-platform-tests/html/webappapis/scripting/events/event-handler-onresize.html
@@ -6,7 +6,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <div id="log"></div>
 <script>
-var t = async_test("body.onresize should set the window.onload handler")
+var t = async_test("body.onresize should set the window.onresize handler")
 window.onresize = t.step_func(function() {
   assert_unreached("This handler should be overwritten.")
 })
diff --git a/tests/wpt/web-platform-tests/interfaces/WebCryptoAPI.idl b/tests/wpt/web-platform-tests/interfaces/WebCryptoAPI.idl
index 0b515fc12e70..fecb3b72d3af 100644
--- a/tests/wpt/web-platform-tests/interfaces/WebCryptoAPI.idl
+++ b/tests/wpt/web-platform-tests/interfaces/WebCryptoAPI.idl
@@ -4,7 +4,7 @@
 // Source: Web Cryptography API (https://w3c.github.io/webcrypto/Overview.html)
 
 partial interface mixin WindowOrWorkerGlobalScope {
-  readonly attribute Crypto crypto;
+  [SameObject] readonly attribute Crypto crypto;
 };
 
 [Exposed=(Window,Worker)]
@@ -160,7 +160,7 @@ dictionary RsaHashedImportParams : Algorithm {
 
 dictionary RsaPssParams : Algorithm {
   // The desired length of the random salt
-  [EnforceRange] required unsigned long saltLength;
+  required [EnforceRange] unsigned long saltLength;
 };
 
 dictionary RsaOaepParams : Algorithm {
@@ -206,7 +206,7 @@ dictionary AesCtrParams : Algorithm {
   required BufferSource counter;
   // The length, in bits, of the rightmost part of the counter block
   // that is incremented.
-  [EnforceRange] required octet length;
+  required [EnforceRange] octet length;
 };
 
 dictionary AesKeyAlgorithm : KeyAlgorithm {
@@ -216,12 +216,12 @@ dictionary AesKeyAlgorithm : KeyAlgorithm {
 
 dictionary AesKeyGenParams : Algorithm {
   // The length, in bits, of the key.
-  [EnforceRange] required unsigned short length;
+  required [EnforceRange] unsigned short length;
 };
 
 dictionary AesDerivedKeyParams : Algorithm {
   // The length, in bits, of the key.
-  [EnforceRange] required unsigned short length;
+  required [EnforceRange] unsigned short length;
 };
 
 dictionary AesCbcParams : Algorithm {
@@ -272,6 +272,6 @@ dictionary HkdfParams : Algorithm {
 
 dictionary Pbkdf2Params : Algorithm {
   required BufferSource salt;
-  [EnforceRange] required unsigned long iterations;
+  required [EnforceRange] unsigned long iterations;
   required HashAlgorithmIdentifier hash;
 };
diff --git a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
index 340dab647d6c..455720c641e6 100644
--- a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
+++ b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
@@ -85,7 +85,7 @@ enum NDEFPushTarget {
 };
 
 dictionary NDEFScanOptions {
-  USVString id = "";
+  USVString id;
   USVString recordType;
   USVString mediaType = "";
   AbortSignal? signal;
diff --git a/tests/wpt/web-platform-tests/layout-instability/clip-negative-bottom-margin.html b/tests/wpt/web-platform-tests/layout-instability/clip-negative-bottom-margin.html
new file mode 100644
index 000000000000..2c329d9fcd66
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/clip-negative-bottom-margin.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>Layout Instability: clip with negative bottom margin</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+#scroller { overflow: scroll; width: 200px; height: 500px; }
+#space { height: 1000px; margin-bottom: -500px; }
+#j { width: 150px; height: 150px; background: yellow; }
+
+</style>
+<div id='scroller'>
+  <div id='space'></div>
+  <div id='j'></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Increase j's top margin by 100px. Since j is fully clipped by the scroller,
+  // this should not generate a shift.
+  document.querySelector("#j").style.marginTop = "100px";
+
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, "Clip with negative bottom margin.");
+
+</script>
+
+
diff --git a/tests/wpt/web-platform-tests/layout-instability/composited-element-movement.html b/tests/wpt/web-platform-tests/layout-instability/composited-element-movement.html
new file mode 100644
index 000000000000..c9906903358d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/composited-element-movement.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<title>Layout Instability: element with compositing layer hint</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+#shift {
+  position: relative;
+  width: 500px;
+  height: 200px;
+  background: yellow;
+}
+#container {
+  position: absolute;
+  width: 350px;
+  height: 400px;
+  right: 50px;
+  top: 100px;
+  background: #ccc;
+}
+.promote { will-change: transform; }
+
+</style>
+<div id="container" class="promote">
+  <div id="space"></div>
+  <div id="shift" class="promote"></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Induce a shift.
+  document.querySelector("#space").style = "height: 100px";
+
+  // #shift is 400x200 after viewport intersection with correct application of
+  // composited #container offset, and 100px lower after shifting, so impact
+  // region is 400 * (200 + 100).
+  const expectedScore = computeExpectedScore(400 * (200 + 100), 100);
+
+  // Observer fires after the frame is painted.
+  assert_equals(watcher.score, 0);
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, "Element with compositing layer hint.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/fully-clipped-visual-rect.html b/tests/wpt/web-platform-tests/layout-instability/fully-clipped-visual-rect.html
new file mode 100644
index 000000000000..bfd74a2407e2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/fully-clipped-visual-rect.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>Layout Instability: fully clipped visual rect</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { margin: 0; }
+#clip { width: 0px; height: 600px; overflow: hidden; }
+#j { position: relative; width: 300px; height: 200px; }
+
+</style>
+<div id='clip'><div id='j'></div></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Shift an element that is fully clipped by its container.
+  document.querySelector("#j").style.top = "200px";
+
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, "Fully clipped visual rect.");
+
+</script>
+
+
diff --git a/tests/wpt/web-platform-tests/layout-instability/ignore-fixed-and-sticky.html b/tests/wpt/web-platform-tests/layout-instability/ignore-fixed-and-sticky.html
new file mode 100644
index 000000000000..1b39dc9e6e93
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/ignore-fixed-and-sticky.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<title>Layout Instability: ignore fixed and sticky positioning</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { height: 2000px; }
+#f1, #f2 {
+  position: fixed;
+  width: 300px;
+  height: 100px;
+  left: 100px;
+}
+#f1 { top: 0; }
+#f2 { top: 150px; will-change: transform; }
+#s1 {
+  position: sticky;
+  width: 200px;
+  height: 100px;
+  left: 450px;
+  top: 0;
+}
+
+</style>
+<div id='f1'>fixed</div>
+<div id='f2'>fixed composited</div>
+<div id='s1'>sticky</div>
+normal
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Scroll down by 50px.
+  document.scrollingElement.scrollTop = 50;
+
+  // Force a layout.
+  document.body.style.height = "2500px";
+
+  // No layout shift should occur as a result of the scroll-triggered
+  // repositioning of fixed and sticky elements.
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, 'Ignore fixed and sticky.');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/local-shift-without-viewport-shift.html b/tests/wpt/web-platform-tests/layout-instability/local-shift-without-viewport-shift.html
new file mode 100644
index 000000000000..37729f1c13c2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/local-shift-without-viewport-shift.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>Layout Instability: local shift without viewport shift</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+#c { position: relative; width: 300px; height: 100px; transform: scale(0.1); }
+#j { position: relative; width: 100px; height: 10px; }
+
+</style>
+<div id='c'>
+  <div id='j'></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  document.querySelector("#j").style.top = "4px";
+
+  // Make sure no shift score is reported, since the element didn't move in the
+  // viewport.
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, "Local shift without viewport shift.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/multi-clip-visual-rect.html b/tests/wpt/web-platform-tests/layout-instability/multi-clip-visual-rect.html
new file mode 100644
index 000000000000..36475d4c826c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/multi-clip-visual-rect.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>Layout Instability: multi clip visual rect</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { margin: 0; }
+#outer { width: 200px; height: 600px; overflow: hidden; }
+#inner { width: 300px; height: 150px; overflow: hidden; }
+#j { position: relative; width: 300px; height: 600px; }
+
+</style>
+<div id='outer'><div id='inner'><div id='j'></div></div></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  document.querySelector("#j").style.top = "-200px";
+
+  // Note that, while the element moves up 200px, its visibility is
+  // clipped at 0px,150px height, so the additional 200px of vertical
+  // move distance is not included in the score.
+  // (clip width 200) * (clip height 150)
+  const expectedScore = computeExpectedScore(200 * 150, 200);
+
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, "Multi clip visual rect.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/partially-clipped-visual-rect.html b/tests/wpt/web-platform-tests/layout-instability/partially-clipped-visual-rect.html
new file mode 100644
index 000000000000..3b18b98dd933
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/partially-clipped-visual-rect.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>Layout Instability: partially clipped visual rect</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { margin: 0; }
+#clip { width: 150px; height: 600px; overflow: hidden; }
+#j { position: relative; width: 300px; height: 200px; }
+
+</style>
+<div id='clip'><div id='j'></div></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  document.querySelector("#j").style.top = "200px";
+
+  // (clipped width 150px) * (height 200 + movement 200)
+  const expectedScore = computeExpectedScore(150 * (200 + 200), 200);
+
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, "Partially clipped visual rect.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/shift-into-viewport.html b/tests/wpt/web-platform-tests/layout-instability/shift-into-viewport.html
new file mode 100644
index 000000000000..6ace93ad54c2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/shift-into-viewport.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<title>Layout Instability: shift into viewport</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { margin: 0; }
+#j { position: relative; width: 600px; height: 200px; top: 600px; }
+
+</style>
+<div id='j'></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  document.querySelector("#j").style.top = "400px";
+
+  // The element moves from outside the viewport to within the viewport, which
+  // should generate a shift.
+  // (width 600) * (height 0 + move 200)
+  const expectedScore = computeExpectedScore(600 * 200, 200);
+
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, "Shift into viewport.");
+
+</script>
+
diff --git a/tests/wpt/web-platform-tests/layout-instability/shift-outside-viewport.html b/tests/wpt/web-platform-tests/layout-instability/shift-outside-viewport.html
new file mode 100644
index 000000000000..49242913760a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/shift-outside-viewport.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>Layout Instability: shift outside viewport</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { margin: 0; }
+#j { position: relative; width: 600px; height: 200px; top: 600px; }
+
+</style>
+<div id='j'></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  document.querySelector("#j").style.top = "800px";
+
+  // Since the element moves entirely outside of the viewport, it shouldn't
+  // generate a score.
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, "Shift outside viewport.");
+
+</script>
+
+
diff --git a/tests/wpt/web-platform-tests/layout-instability/shift-while-scrolled.html b/tests/wpt/web-platform-tests/layout-instability/shift-while-scrolled.html
new file mode 100644
index 000000000000..88eeedea8778
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/shift-while-scrolled.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<title>Layout Instability: shift while scrolled</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+body { height: 2000px; margin: 0; }
+#shift { position: relative; width: 300px; height: 200px; }
+
+</style>
+<div id="shift"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Scroll down by 100px.
+  document.scrollingElement.scrollTop = 100;
+  assert_equals(watcher.score, 0);
+
+  // Generate a layout shift.
+  document.querySelector("#shift").style = "top: 60px";
+
+  // Impact region: width * (height - scrollTop + moveDistance)
+  const expectedScore = computeExpectedScore(
+      300 * (200 - 100 + 60), 60);
+
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, 'Layout shift with non-zero scroll offset.');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/shift-with-counterscroll.html b/tests/wpt/web-platform-tests/layout-instability/shift-with-counterscroll.html
new file mode 100644
index 000000000000..8ad1a463443e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/shift-with-counterscroll.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<title>Layout Instability: shift with counterscroll not counted</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+#s {
+  overflow: scroll;
+  position: absolute;
+  left: 20px;
+  top: 20px;
+  width: 200px;
+  height: 200px;
+}
+#sp {
+  width: 170px;
+  height: 600px;
+}
+#ch {
+  position: relative;
+  background: yellow;
+  left: 10px;
+  top: 100px;
+  width: 150px;
+  height: 150px;
+}
+
+</style>
+<div id="s">
+  <div id="sp">
+    <div id="ch"></div>
+  </div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  let scroller = document.querySelector("#s");
+  let changer = document.querySelector("#ch");
+
+  changer.style.top = "200px";
+  scroller.scrollTop = 100;
+
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, "Shift with counterscroll not counted.");
+
+</script>
+
+
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009-ref.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001-ref.html
similarity index 76%
rename from tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009-ref.html
rename to tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001-ref.html
index 8b80b7e6bead..bbd42a93eedb 100644
--- a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009-ref.html
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001-ref.html
@@ -2,7 +2,7 @@
 <html>
   <head>
     <meta charset="utf-8"/>
-    <title>RTL ms lquote="X" rquote="p"</title>
+    <title>ms legacy lquote and rquote attributes (reference)</title>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style>
       math {
@@ -14,7 +14,7 @@
 
     <p>
       <math>
-        <ms lquote="p" rquote="X">É</ms>
+        <ms>X</ms>
       </math>
     </p>
 
diff --git a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009.html b/tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001.html
similarity index 69%
rename from tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009.html
rename to tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001.html
index c0ca31d40a82..b0b03f225525 100644
--- a/tests/wpt/web-platform-tests/mathml/presentation-markup/direction/direction-009.html
+++ b/tests/wpt/web-platform-tests/mathml/presentation-markup/tokens/ms-001.html
@@ -2,12 +2,12 @@
 <html>
   <head>
     <meta charset="utf-8"/>
-    <title>RTL ms lquote="X" rquote="p"</title>
+    <title>ms legacy lquote and rquote attributes</title>
     <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
     <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#css-styling">
     <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#string-literal-ms">
-    <meta name="assert" content="Verify that a RTL ms element renders the same as if its left and right quotes were switched.">
-    <link rel="match" href="direction-009-ref.html">
+    <meta name="assert" content="Verify that legacy lquote and rquote attributes are ignored on the ms element.">
+    <link rel="match" href="ms-001-ref.html">
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style>
       math {
@@ -18,13 +18,13 @@
   <body>
 
     <p>
-      <math dir="rtl">
-        <ms lquote="X" rquote="p">É</ms>
+      <math>
+        <ms lquote="É" rquote="p">X</ms>
       </math>
     </p>
 
    <script src="/mathml/support/feature-detection.js"></script>
-   <script>MathMLFeatureDetection.ensure_for_match_reftest("has_dir");</script>
+   <script>MathMLFeatureDetection.ensure_for_match_reftest("has_ms");</script>
 
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/portals/about-blank-cannot-host.html b/tests/wpt/web-platform-tests/portals/about-blank-cannot-host.html
new file mode 100644
index 000000000000..207d477697d8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/about-blank-cannot-host.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+promise_test(async (t) => {
+  let hostWindow = window.open();
+  assert_equals(hostWindow.location.href, "about:blank");
+
+  let portal = hostWindow.document.createElement("portal");
+  portal.src = "resources/simple-portal.html";
+  hostWindow.document.body.appendChild(portal);
+
+  await promise_rejects(t, "InvalidStateError", portal.activate());
+}, "about:blank cannot host a portal");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/portals/portal-activate-data.html b/tests/wpt/web-platform-tests/portals/portal-activate-data.html
index 38204edb2c3c..b3b9223b5199 100644
--- a/tests/wpt/web-platform-tests/portals/portal-activate-data.html
+++ b/tests/wpt/web-platform-tests/portals/portal-activate-data.html
@@ -2,6 +2,7 @@
 <title>Tests passing of data along with portal activation</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="resources/open-blank-host.js"></script>
 <body>
 <canvas id="canvas"></canvas>
 <script>
@@ -12,7 +13,7 @@
 }
 
 async function openPortalAndActivate(logic, activateOptions) {
-  const w = window.open();
+  const w = await openBlankPortalHost();
   try {
     const portal = w.document.createElement('portal');
     portal.src = new URL('resources/portal-activate-data-portal.html?logic=' + encodeURIComponent(logic), location.href);
diff --git a/tests/wpt/web-platform-tests/portals/portals-activate-resolution.html b/tests/wpt/web-platform-tests/portals/portals-activate-resolution.html
index 44ccea3bc521..db77a990e532 100644
--- a/tests/wpt/web-platform-tests/portals/portals-activate-resolution.html
+++ b/tests/wpt/web-platform-tests/portals/portals-activate-resolution.html
@@ -1,9 +1,10 @@
 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="resources/open-blank-host.js"></script>
 <script>
   promise_test(async () => {
-    var win = window.open();
+    var win = await openBlankPortalHost();
     var portal = win.document.createElement("portal");
     portal.src = new URL("resources/simple-portal.html", location.href)
 
diff --git a/tests/wpt/web-platform-tests/portals/portals-navigate-after-adoption.html b/tests/wpt/web-platform-tests/portals/portals-navigate-after-adoption.html
index 083eeaa14821..5ad30d7928a6 100644
--- a/tests/wpt/web-platform-tests/portals/portals-navigate-after-adoption.html
+++ b/tests/wpt/web-platform-tests/portals/portals-navigate-after-adoption.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="resources/open-blank-host.js"></script>
 <script>
 function nextMessage(target) {
   return new Promise((resolve, reject) => {
@@ -10,7 +11,7 @@
 
 async function openPortalAndActivate(logic) {
   let {port1, port2} = new MessageChannel();
-  const w = window.open();
+  const w = await openBlankPortalHost();
   try {
     const portal = w.document.createElement('portal');
     portal.src = new URL('resources/eval-portal.html?logic=' + encodeURIComponent(logic), location.href);
diff --git a/tests/wpt/web-platform-tests/portals/portals-set-src-after-activate.html b/tests/wpt/web-platform-tests/portals/portals-set-src-after-activate.html
index 8da6b3418401..70a16436a67f 100644
--- a/tests/wpt/web-platform-tests/portals/portals-set-src-after-activate.html
+++ b/tests/wpt/web-platform-tests/portals/portals-set-src-after-activate.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="resources/open-blank-host.js"></script>
 <script>
 function nextMessage(target) {
   return new Promise((resolve, reject) => {
@@ -9,7 +10,7 @@
 }
 
 promise_test(async () => {
-  const w = window.open();
+  const w = await openBlankPortalHost();
   try {
     const portal = w.document.createElement('portal');
     portal.src = new URL('resources/simple-portal-adopts-predecessor.html', location.href);
diff --git a/tests/wpt/web-platform-tests/portals/resources/blank-host.html b/tests/wpt/web-platform-tests/portals/resources/blank-host.html
new file mode 100644
index 000000000000..d9f3a61eb848
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/blank-host.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<!--
+  This is a blank page used when a test needs a new window to host and activate
+  a portal. Tests cannot simply use window.open() without a URL as about:blank
+  may not host a portal.
+-->
+<body>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/open-blank-host.js b/tests/wpt/web-platform-tests/portals/resources/open-blank-host.js
new file mode 100644
index 000000000000..f7580bd15212
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/open-blank-host.js
@@ -0,0 +1,14 @@
+// Portal tests often need to create portals in a context other than the one
+// in which the tests are running. This is because the host context may be
+// discarded during the course of the test.
+
+// Opens a blank page for use as a portal host.
+// Tests cannot simply use window.open() without a URL as about:blank may not
+// host a portal.
+async function openBlankPortalHost() {
+  let hostWindow = window.open('/portals/resources/blank-host.html');
+  await new Promise((resolve) => {
+    hostWindow.addEventListener('load', resolve, {once: true});
+  });
+  return hostWindow;
+}
diff --git a/tests/wpt/web-platform-tests/resources/chromium/sms_mock.js b/tests/wpt/web-platform-tests/resources/chromium/sms_mock.js
index bdfbc2052fa1..d8476cf37ad0 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/sms_mock.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/sms_mock.js
@@ -8,7 +8,7 @@ const SmsProvider = (() => {
       this.mojoReceiver_ = new blink.mojom.SmsReceiverReceiver(this);
 
       this.interceptor_ = new MojoInterfaceInterceptor(
-          blink.mojom.SmsReceiver.$interfaceName, "context", true)
+          blink.mojom.SmsReceiver.$interfaceName, "context", true);
 
       this.interceptor_.oninterfacerequest = (e) => {
         this.mojoReceiver_.$.bindHandle(e.handle);
@@ -18,15 +18,16 @@ const SmsProvider = (() => {
       this.returnValues_ = {};
     }
 
-    receive() {
+    async receive() {
       let call = this.returnValues_.receive ?
           this.returnValues_.receive.shift() : null;
-      if (!call) {
-        throw new Error("Unexpected call.");
-      }
+      if (!call)
+        return;
       return call();
     }
 
+    async abort() {}
+
     pushReturnValuesForTesting(callName, value) {
       this.returnValues_[callName] = this.returnValues_[callName] || [];
       this.returnValues_[callName].push(value);
diff --git a/tests/wpt/web-platform-tests/sms/interceptor.https.html b/tests/wpt/web-platform-tests/sms/interceptor.https.html
index 6da2d71c52a9..94f1951a1380 100644
--- a/tests/wpt/web-platform-tests/sms/interceptor.https.html
+++ b/tests/wpt/web-platform-tests/sms/interceptor.https.html
@@ -114,4 +114,21 @@
   }
 }, 'Deal with cancelled requests');
 
+promise_test(async t => {
+  const controller = new AbortController();
+  const signal = controller.signal;
+
+  controller.abort();
+  await promise_rejects(t, 'AbortError', navigator.sms.receive({signal}));
+}, 'Should abort request');
+
+promise_test(async t => {
+  const controller = new AbortController();
+  const signal = controller.signal;
+
+  let error = navigator.sms.receive({signal});
+  controller.abort();
+  await promise_rejects(t, 'AbortError', error);
+}, 'Should abort request even while request is in progress.');
+
 </script>
diff --git a/tests/wpt/web-platform-tests/sms/sms_receiver.idl b/tests/wpt/web-platform-tests/sms/sms_receiver.idl
index 64048523f901..ca8cfdd798c8 100644
--- a/tests/wpt/web-platform-tests/sms/sms_receiver.idl
+++ b/tests/wpt/web-platform-tests/sms/sms_receiver.idl
@@ -13,7 +13,7 @@ interface SMS {
 };
 
 dictionary SMSReceiverOptions {
-  // TODO(b/976401): Implement abort controller.
+  AbortSignal signal;
 };
 
 [
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/servodriver.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/servodriver.py
index ea345efa44fd..2953de18174e 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/servodriver.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/browsers/servodriver.py
@@ -163,9 +163,7 @@ def on_output(self, line):
                                    command=" ".join(self.command))
 
     def is_alive(self):
-        if self.runner:
-            return self.runner.is_running()
-        return False
+        return self.proc.poll() is None
 
     def cleanup(self):
         self.stop()