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 3a3d15b8406..947e223fb28 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
@@ -14,9 +14,6 @@
   [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]
   [Untitled]
@@ -37,6 +34,3 @@
   [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 bd2e474e4c9..19099fce0f9 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -130303,6 +130303,18 @@
      {}
     ]
    ],
+   "css/css-lists/list-marker-symbol-bidi.html": [
+    [
+     "css/css-lists/list-marker-symbol-bidi.html",
+     [
+      [
+       "/css/css-lists/list-marker-symbol-bidi-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-lists/list-marker-with-lineheight-and-overflow-hidden-001.html": [
     [
      "css/css-lists/list-marker-with-lineheight-and-overflow-hidden-001.html",
@@ -154223,6 +154235,18 @@
      {}
     ]
    ],
+   "css/css-text/word-break/word-break-break-all-inline-008.html": [
+    [
+     "css/css-text/word-break/word-break-break-all-inline-008.html",
+     [
+      [
+       "/css/css-text/word-break/reference/word-break-break-all-010-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-text/word-break/word-break-break-word-overflow-wrap-interactions.html": [
     [
      "css/css-text/word-break/word-break-break-word-overflow-wrap-interactions.html",
@@ -154331,6 +154355,78 @@
      {}
     ]
    ],
+   "css/css-text/word-break/word-break-min-content-001.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-001.html",
+     [
+      [
+       "/css/css-text/overflow-wrap/reference/overflow-wrap-min-content-size-001-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text/word-break/word-break-min-content-002.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-002.html",
+     [
+      [
+       "/css/css-text/overflow-wrap/reference/overflow-wrap-min-content-size-003-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text/word-break/word-break-min-content-003.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-003.html",
+     [
+      [
+       "/css/css-text/word-break/reference/word-break-break-all-010-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text/word-break/word-break-min-content-004.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-004.html",
+     [
+      [
+       "/css/css-text/word-break/reference/word-break-break-all-010-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text/word-break/word-break-min-content-005.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-005.html",
+     [
+      [
+       "/css/css-text/overflow-wrap/reference/overflow-wrap-min-content-size-003-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-text/word-break/word-break-min-content-006.html": [
+    [
+     "css/css-text/word-break/word-break-min-content-006.html",
+     [
+      [
+       "/css/css-text/overflow-wrap/reference/overflow-wrap-min-content-size-002-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-text/word-break/word-break-normal-001.html": [
     [
      "css/css-text/word-break/word-break-normal-001.html",
@@ -237198,6 +237294,9 @@
    "css/CSS2/positioning/left-offset-percentage-002-ref.xht": [
     []
    ],
+   "css/CSS2/positioning/line-break-after-leading-oof-001-ref.html": [
+    []
+   ],
    "css/CSS2/positioning/position-006-ref.xht": [
     []
    ],
@@ -251568,6 +251667,9 @@
    "css/css-lists/list-item-definition-ref.html": [
     []
    ],
+   "css/css-lists/list-marker-symbol-bidi-ref.html": [
+    []
+   ],
    "css/css-lists/list-marker-with-lineheight-and-overflow-hidden-001-ref.html": [
     []
    ],
@@ -264423,6 +264525,12 @@
    "docs/assets/reftest_graph_example.svg": [
     []
    ],
+   "docs/assets/testharness-tutorial-test-screenshot-1.png": [
+    []
+   ],
+   "docs/assets/testharness-tutorial-test-screenshot-2.png": [
+    []
+   ],
    "docs/conf.py": [
     []
    ],
@@ -264555,6 +264663,9 @@
    "docs/writing-tests/testharness-api.md": [
     []
    ],
+   "docs/writing-tests/testharness-tutorial.md": [
+    []
+   ],
    "docs/writing-tests/testharness.md": [
     []
    ],
@@ -268161,6 +268272,9 @@
    "html/browsers/sandboxing/noscript-iframe.html": [
     []
    ],
+   "html/browsers/sandboxing/sandbox-new-execution-context-iframe.html": [
+    []
+   ],
    "html/browsers/sandboxing/sandbox-parse-noscript-ref.html": [
     []
    ],
@@ -280668,9 +280782,6 @@
    "service-workers/service-worker/ServiceWorkerGlobalScope/resources/update-worker.py": [
     []
    ],
-   "service-workers/service-worker/fetch-error-worker.js": [
-    []
-   ],
    "service-workers/service-worker/multi-globals/current/current.https.html": [
     []
    ],
@@ -280968,6 +281079,9 @@
    "service-workers/service-worker/resources/fetch-csp-iframe.html.sub.headers": [
     []
    ],
+   "service-workers/service-worker/resources/fetch-error-worker.js": [
+    []
+   ],
    "service-workers/service-worker/resources/fetch-event-add-async-worker.js": [
     []
    ],
@@ -334466,6 +334580,12 @@
      {}
     ]
    ],
+   "dom/collections/HTMLCollection-own-props.html": [
+    [
+     "dom/collections/HTMLCollection-own-props.html",
+     {}
+    ]
+   ],
    "dom/collections/HTMLCollection-supported-property-indices.html": [
     [
      "dom/collections/HTMLCollection-supported-property-indices.html",
@@ -336023,6 +336143,12 @@
      {}
     ]
    ],
+   "dom/nodes/aria-attribute-reflection.tentative.html": [
+    [
+     "dom/nodes/aria-attribute-reflection.tentative.html",
+     {}
+    ]
+   ],
    "dom/nodes/aria-element-reflection.tentative.html": [
     [
      "dom/nodes/aria-element-reflection.tentative.html",
@@ -353800,6 +353926,12 @@
      {}
     ]
    ],
+   "html/browsers/sandboxing/sandbox-new-execution-context.html": [
+    [
+     "html/browsers/sandboxing/sandbox-new-execution-context.html",
+     {}
+    ]
+   ],
    "html/browsers/the-window-object/BarProp.window.js": [
     [
      "html/browsers/the-window-object/BarProp.window.html",
@@ -360466,6 +360598,14 @@
      {}
     ]
    ],
+   "html/semantics/forms/historical-search-event.html": [
+    [
+     "html/semantics/forms/historical-search-event.html",
+     {
+      "testdriver": true
+     }
+    ]
+   ],
    "html/semantics/forms/historical.html": [
     [
      "html/semantics/forms/historical.html",
@@ -360818,6 +360958,12 @@
      {}
     ]
    ],
+   "html/semantics/forms/the-input-element/checkbox-detached-change-event.html": [
+    [
+     "html/semantics/forms/the-input-element/checkbox-detached-change-event.html",
+     {}
+    ]
+   ],
    "html/semantics/forms/the-input-element/checkbox.html": [
     [
      "html/semantics/forms/the-input-element/checkbox.html",
@@ -361022,6 +361168,12 @@
      {}
     ]
    ],
+   "html/semantics/forms/the-input-element/radio-detached-change-event.html": [
+    [
+     "html/semantics/forms/the-input-element/radio-detached-change-event.html",
+     {}
+    ]
+   ],
    "html/semantics/forms/the-input-element/radio-groupname-case.html": [
     [
      "html/semantics/forms/the-input-element/radio-groupname-case.html",
@@ -421179,18 +421331,18 @@
      }
     ]
    ],
-   "web-animations/interfaces/Document/getAnimations.html": [
-    [
-     "web-animations/interfaces/Document/getAnimations.html",
-     {}
-    ]
-   ],
    "web-animations/interfaces/Document/timeline.html": [
     [
      "web-animations/interfaces/Document/timeline.html",
      {}
     ]
    ],
+   "web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html": [
+    [
+     "web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html",
+     {}
+    ]
+   ],
    "web-animations/interfaces/DocumentTimeline/constructor.html": [
     [
      "web-animations/interfaces/DocumentTimeline/constructor.html",
@@ -443344,6 +443496,12 @@
      {}
     ]
    ],
+   "css/CSS2/positioning/line-break-after-leading-oof-001.html": [
+    [
+     "css/CSS2/positioning/line-break-after-leading-oof-001.html",
+     {}
+    ]
+   ],
    "css/CSS2/positioning/position-001.xht": [
     [
      "css/CSS2/positioning/position-001.xht",
@@ -464972,7 +465130,7 @@
    "testharness"
   ],
   "animation-worklet/stateful-animator.https.html": [
-   "b83590650b19756872c95de8117a248d65c764b0",
+   "be29fa109cba3b2117d5029f4a70f091a440b324",
    "testharness"
   ],
   "animation-worklet/worklet-animation-animator-name.https.html": [
@@ -469040,7 +469198,7 @@
    "support"
   ],
   "conformance-checkers/html-aria/_functional/tree/js/prototype.js": [
-   "b0e0675867afd4374b2d72935eee422d55c84770",
+   "c14b177230a50e661b04ff43aefb5a333a54f41b",
    "support"
   ],
   "conformance-checkers/html-aria/accessible-name-input/checkbox-title.html": [
@@ -528839,6 +528997,14 @@
    "12c00cf82a57380cdcf5001dcbfc09841a6edfc5",
    "reftest"
   ],
+  "css/CSS2/positioning/line-break-after-leading-oof-001-ref.html": [
+   "50c682eddc782d1539a097d2da2fc0f44c44f573",
+   "support"
+  ],
+  "css/CSS2/positioning/line-break-after-leading-oof-001.html": [
+   "b00c48156edbfb87a7cdbc2137cda8197c4e9eda",
+   "visual"
+  ],
   "css/CSS2/positioning/position-001.xht": [
    "2e5b573ab527eb8f73cd66652b9f06482e8a43e7",
    "visual"
@@ -552828,7 +552994,7 @@
    "manual"
   ],
   "css/css-animations/animation-fill-mode-001-manual.html": [
-   "7c38164b2d825f5a5491a73ea43b8f13daac8e7c",
+   "2176672367274201489bb5885d3cd00d3bb01fc9",
    "manual"
   ],
   "css/css-animations/animation-fill-mode-002-manual.html": [
@@ -552836,7 +553002,7 @@
    "manual"
   ],
   "css/css-animations/animation-fill-mode-003-manual.html": [
-   "bd5a93245b39979f61c294c9ddaf5111c8947eed",
+   "561237d2673624b0d11b44e41a36df6b19bb582c",
    "manual"
   ],
   "css/css-animations/animation-fill-mode-004-manual.html": [
@@ -578211,6 +578377,14 @@
    "14e351f9ecd34356087fc5ec7361d8e4d9b542e0",
    "reftest"
   ],
+  "css/css-lists/list-marker-symbol-bidi-ref.html": [
+   "cf213d731f33201fc6863544f18bf97c51eb2a3c",
+   "support"
+  ],
+  "css/css-lists/list-marker-symbol-bidi.html": [
+   "e82d9ae1567111038ee9927bda124956df1ebf03",
+   "reftest"
+  ],
   "css/css-lists/list-marker-with-lineheight-and-overflow-hidden-001-ref.html": [
    "ae6486147e28502db80f6b887b1a6b16c30184f2",
    "support"
@@ -578296,7 +578470,7 @@
    "reftest"
   ],
   "css/css-lists/nested-list-with-list-style-type-none.html": [
-   "e103113c3f4d98ed34b4cdda04bd436469d01f54",
+   "325459df8a2bdb5e23083fe6ee3961dde0fd2027",
    "testharness"
   ],
   "css/css-lists/nested-marker-dynamic.html": [
@@ -584240,7 +584414,7 @@
    "reftest"
   ],
   "css/css-pseudo/parsing/tree-abiding-pseudo-elements.html": [
-   "4997ae4f564d382fafd03e742a4b706d7e98fc80",
+   "05c23a3bc143ce2a005b3686af2eae2cb60cb7ba",
    "testharness"
   ],
   "css/css-pseudo/placeholder-input-number-notref.html": [
@@ -597967,6 +598141,10 @@
    "bc5a08d38a505b1b08f204e6d243b43fa3dd34bc",
    "reftest"
   ],
+  "css/css-text/word-break/word-break-break-all-inline-008.html": [
+   "930ae436fe4f1c91b60e9a84c0925e679b6ddfc0",
+   "reftest"
+  ],
   "css/css-text/word-break/word-break-break-word-crash-001.html": [
    "894a6f3aa0ce257a92926158b75a29986a98e079",
    "testharness"
@@ -598011,6 +598189,30 @@
    "6532e41609ff6eb2870003ad6761b45f2b60fdae",
    "reftest"
   ],
+  "css/css-text/word-break/word-break-min-content-001.html": [
+   "20b610180b359bfdf7da5720d2e962af2ba6343f",
+   "reftest"
+  ],
+  "css/css-text/word-break/word-break-min-content-002.html": [
+   "0f5d18ff4b262a8716864c401f2e7f223adbcab3",
+   "reftest"
+  ],
+  "css/css-text/word-break/word-break-min-content-003.html": [
+   "84e7cfe872f9af121f5836638db51a306e119c52",
+   "reftest"
+  ],
+  "css/css-text/word-break/word-break-min-content-004.html": [
+   "efa61b9cd8af65bdb354ef7b07e7008f8a3b6511",
+   "reftest"
+  ],
+  "css/css-text/word-break/word-break-min-content-005.html": [
+   "ccbf9887054c24dc1ddc32cd73945cad087c08b8",
+   "reftest"
+  ],
+  "css/css-text/word-break/word-break-min-content-006.html": [
+   "0d772a2d88cfc1f4a9b4ae482fa64a38279b04f2",
+   "reftest"
+  ],
   "css/css-text/word-break/word-break-normal-001.html": [
    "61ccba2465f772c46a771a8868e9036ff4a93b9d",
    "reftest"
@@ -612636,11 +612838,11 @@
    "reftest"
   ],
   "css/css-writing-modes/sizing-orthog-htb-in-vlr-004-ref.xht": [
-   "5f971974b8dd0998fddc71a33b5c0020e09f6c8d",
+   "a7557f928237c68c9e9717feb0be8c0e75e7e8de",
    "support"
   ],
   "css/css-writing-modes/sizing-orthog-htb-in-vlr-004.xht": [
-   "cd1529ce42116abbc68c1a1a25170607ec8021b1",
+   "b7322a0083cbd04a20083b5ddf07ef767dd6da5b",
    "reftest"
   ],
   "css/css-writing-modes/sizing-orthog-htb-in-vlr-006-ref.xht": [
@@ -612764,7 +612966,7 @@
    "reftest"
   ],
   "css/css-writing-modes/sizing-orthog-htb-in-vrl-001-ref.xht": [
-   "297457f62c2c575a931be4a21cc1158014aa7ee1",
+   "e423259f0dbba089c9f3865684b48e853849569e",
    "support"
   ],
   "css/css-writing-modes/sizing-orthog-htb-in-vrl-001.xht": [
@@ -615268,11 +615470,11 @@
    "reftest"
   ],
   "css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-lr.html": [
-   "8c59532b1a50777337007c2b932b1df42067e18f",
+   "ecab4a84e224ca8f099107af452a6d8746e77816",
    "testharness"
   ],
   "css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-rl.html": [
-   "523928f9ad8e40e4f539e81724cb905b1b18159f",
+   "eb327b00c093239024ef64ace7e76b6bf7cf92aa",
    "testharness"
   ],
   "css/css-writing-modes/wm-propagation-svg-root-scrollbar.svg": [
@@ -630767,6 +630969,14 @@
    "48e6488dbb47dc8fccab9193bb34871f2bb930a2",
    "support"
   ],
+  "docs/assets/testharness-tutorial-test-screenshot-1.png": [
+   "5195ba25ae647acdc1dc9cd3877d1204abab95df",
+   "support"
+  ],
+  "docs/assets/testharness-tutorial-test-screenshot-2.png": [
+   "0010a57173121330bae8df3c3f851db10cffcb67",
+   "support"
+  ],
   "docs/conf.py": [
    "e425667ce888dabed639ff29a7e051d3aedcdd0f",
    "support"
@@ -630888,7 +631098,7 @@
    "support"
   ],
   "docs/writing-tests/index.md": [
-   "c4da79c0d8a4832c690fd64cffdebb8da4c23869",
+   "88e279b0ad128d168efc9be3d25209c8ebfec21e",
    "support"
   ],
   "docs/writing-tests/lint-tool.md": [
@@ -630943,8 +631153,12 @@
    "5883308cc66957b1b7215825fd0ea6c7aa1ca74a",
    "support"
   ],
+  "docs/writing-tests/testharness-tutorial.md": [
+   "dceb674ac4d643f420a0fdd84da2e37051f4b474",
+   "support"
+  ],
   "docs/writing-tests/testharness.md": [
-   "7d38742a7402beeaa011da3bbc0231692c550268",
+   "17ee097ce185d07ac7353a1541c5c30593b9c387",
    "support"
   ],
   "docs/writing-tests/tools.md": [
@@ -630979,6 +631193,10 @@
    "4fc34db7f5f245933013a76335f71e9f4cffe115",
    "testharness"
   ],
+  "dom/collections/HTMLCollection-own-props.html": [
+   "1f21c0837ec92bf48b6f497da22e60a435913a06",
+   "testharness"
+  ],
   "dom/collections/HTMLCollection-supported-property-indices.html": [
    "62ee6bb6abf69e1a4f1b24937c184f86815aca79",
    "testharness"
@@ -632219,6 +632437,10 @@
    "8d9ce2e3ff604ee43807ee0eb1962870439725a9",
    "testharness"
   ],
+  "dom/nodes/aria-attribute-reflection.tentative.html": [
+   "0a3a66bdf435ebef64a282eaec8f7a471096daaf",
+   "testharness"
+  ],
   "dom/nodes/aria-element-reflection.tentative.html": [
    "848828810f160d5ac01f11bf41b27230b9738800",
    "testharness"
@@ -633552,7 +633774,7 @@
    "testharness"
   ],
   "element-timing/scroll-to-text.html": [
-   "a86dd85ce9c8b8bb2709e2078eff02dd5e19484f",
+   "ed332740323b076f160121dbd14390f246413c36",
    "testharness"
   ],
   "element-timing/supported-element-type.html": [
@@ -637568,7 +637790,7 @@
    "testharness"
   ],
   "fetch/api/request/request-init-stream.any.js": [
-   "22e3f41bc2d8a38dd097e61145e213e3febbd108",
+   "df5fb26a0d8fc0d77ea967102be33035b780cea2",
    "testharness"
   ],
   "fetch/api/request/request-keepalive-quota.html": [
@@ -637768,7 +637990,7 @@
    "testharness"
   ],
   "fetch/api/response/response-static-error.html": [
-   "6e927a8bf6267bb9cc7a6f0ad38d332480f5c9ab",
+   "b2d6e82d4279b7c911f38e4fe8294d03b51ec9f3",
    "testharness"
   ],
   "fetch/api/response/response-static-redirect.html": [
@@ -639656,7 +639878,7 @@
    "manual"
   ],
   "fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html": [
-   "66d9c4316137115a9e29644985c835cb029c8fd9",
+   "08c420ec0243d67c831124f825e39be492513129",
    "manual"
   ],
   "fullscreen/api/element-ready-check-fullscreen-element-sibling-manual.html": [
@@ -640828,7 +641050,7 @@
    "testharness"
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    "support"
   ],
   "url/resources/setters_tests.json": [
-   "6b7d19b10164a38901abc70345663a550d4ee737",
+   "d54335f1badecac9d01594ec6e631d6d11e68328",
    "support"
   ],
   "url/resources/toascii.json": [
@@ -712779,14 +713021,14 @@
    "5124e5095724521c721b8781dcfc92ff573f48e8",
    "testharness"
   ],
-  "web-animations/interfaces/Document/getAnimations.html": [
-   "f6a6c3edd447ccf42da4598db7e771a0ab99b04f",
-   "testharness"
-  ],
   "web-animations/interfaces/Document/timeline.html": [
    "b8b4d74d5e536a111449fd0268424ac06a151b95",
    "testharness"
   ],
+  "web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html": [
+   "4730f186b34a426b6dd657b113b6e408e0a08b55",
+   "testharness"
+  ],
   "web-animations/interfaces/DocumentTimeline/constructor.html": [
    "ca0997ac8f9012b7d019760be97e09fa0f837179",
    "testharness"
@@ -713108,7 +713350,7 @@
    "testharness"
   ],
   "web-nfc/NDEFReader_scan.https.html": [
-   "0a3610099486c6d61c4f9171a2d87950e75cd4e5",
+   "3fe95cc91478aea7426e882743814723c4517ec6",
    "testharness"
   ],
   "web-nfc/NDEFReader_scan_iframe.https.html": [
@@ -713128,11 +713370,11 @@
    "manual"
   ],
   "web-nfc/NDEFWriter_push.https.html": [
-   "b909bee3171dcfa56af951f2d4a351487bd9705e",
+   "0d5722bfa019610633cef78d0d2164b2e55de8bb",
    "testharness"
   ],
   "web-nfc/README.md": [
-   "87145b0e3ec0064457dfdcaa6bc6cd2595b88afb",
+   "0787f1f6712e669e1c858940a11da9b22c9c565b",
    "support"
   ],
   "web-nfc/idlharness.https.window.js": [
diff --git a/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-001.html.ini b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-001.html.ini
new file mode 100644
index 00000000000..3ba7eb5584f
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-001.html.ini
@@ -0,0 +1,2 @@
+[word-break-min-content-001.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-002.html.ini b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-002.html.ini
new file mode 100644
index 00000000000..a99d99d6ec9
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-002.html.ini
@@ -0,0 +1,2 @@
+[word-break-min-content-002.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-004.html.ini b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-004.html.ini
new file mode 100644
index 00000000000..5e0ed296c95
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-004.html.ini
@@ -0,0 +1,2 @@
+[word-break-min-content-004.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-005.html.ini b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-005.html.ini
new file mode 100644
index 00000000000..50024d9fcfc
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-005.html.ini
@@ -0,0 +1,2 @@
+[word-break-min-content-005.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-006.html.ini b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-006.html.ini
new file mode 100644
index 00000000000..505329f9ad9
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/word-break/word-break-min-content-006.html.ini
@@ -0,0 +1,2 @@
+[word-break-min-content-006.html]
+  expected: FAIL
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 c511d92d674..03f2f3fe9d1 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
@@ -1,4 +1,5 @@
 [perspective-interpolation.html]
+  expected: CRASH
   [ perspective interpolation]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index 0269091c011..41fde289810 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -3,9 +3,6 @@
   [throws if handleEvent is falsy and not callable]
     expected: NOTRUN
 
-  [looks up handleEvent method on every event dispatch]
-    expected: FAIL
-
   [rethrows errors when getting handleEvent]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index c884dc82eab..7fe95a6c291 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
@@ -2,6 +2,6 @@
   [listeners are called when <iframe> is resized]
     expected: FAIL
 
-  [listeners are called correct number of times]
+  [listener that was added twice is called only once]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/dom/collections/HTMLCollection-own-props.html.ini b/tests/wpt/metadata/dom/collections/HTMLCollection-own-props.html.ini
new file mode 100644
index 00000000000..de00e9f62ca
--- /dev/null
+++ b/tests/wpt/metadata/dom/collections/HTMLCollection-own-props.html.ini
@@ -0,0 +1,4 @@
+[HTMLCollection-own-props.html]
+  [Setting array index while indexed property doesn't exist (strict)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/dom/nodes/Document-contentType/contentType/contenttype_txt.html.ini b/tests/wpt/metadata/dom/nodes/Document-contentType/contentType/contenttype_txt.html.ini
new file mode 100644
index 00000000000..c3916f8555d
--- /dev/null
+++ b/tests/wpt/metadata/dom/nodes/Document-contentType/contentType/contenttype_txt.html.ini
@@ -0,0 +1,2 @@
+[contenttype_txt.html]
+  expected: CRASH
diff --git a/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini b/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini
new file mode 100644
index 00000000000..dcba3565fbe
--- /dev/null
+++ b/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini
@@ -0,0 +1,112 @@
+[aria-attribute-reflection.tentative.html]
+  [aria-relevant attribute reflects.]
+    expected: FAIL
+
+  [aria-required attribute reflects.]
+    expected: FAIL
+
+  [aria-busy attribute reflects.]
+    expected: FAIL
+
+  [aria-current attribute reflects.]
+    expected: FAIL
+
+  [aria-valuetext attribute reflects.]
+    expected: FAIL
+
+  [aria-atomic attribute reflects.]
+    expected: FAIL
+
+  [aria-label attribute reflects.]
+    expected: FAIL
+
+  [aria-setsize attribute reflects.]
+    expected: FAIL
+
+  [aria-rowcount attribute reflects.]
+    expected: FAIL
+
+  [aria-valuemax attribute reflects.]
+    expected: FAIL
+
+  [role attribute reflects.]
+    expected: FAIL
+
+  [aria-sort attribute reflects.]
+    expected: FAIL
+
+  [aria-placeholder attribute reflects.]
+    expected: FAIL
+
+  [aria-live attribute reflects.]
+    expected: FAIL
+
+  [aria-valuenow attribute reflects.]
+    expected: FAIL
+
+  [aria-colcount attribute reflects.]
+    expected: FAIL
+
+  [aria-checked attribute reflects.]
+    expected: FAIL
+
+  [aria-rowspan attribute reflects.]
+    expected: FAIL
+
+  [aria-pressed attribute reflects.]
+    expected: FAIL
+
+  [aria-hidden attribute reflects.]
+    expected: FAIL
+
+  [aria-multiselectable attribute reflects.]
+    expected: FAIL
+
+  [aria-autocomplete attribute reflects.]
+    expected: FAIL
+
+  [aria-posinset attribute reflects.]
+    expected: FAIL
+
+  [aria-rowindex attribute reflects.]
+    expected: FAIL
+
+  [aria-valuemin attribute reflects.]
+    expected: FAIL
+
+  [aria-level attribute reflects.]
+    expected: FAIL
+
+  [aria-disabled attribute reflects.]
+    expected: FAIL
+
+  [aria-orientation attribute reflects.]
+    expected: FAIL
+
+  [aria-colspan attribute reflects.]
+    expected: FAIL
+
+  [aria-colindex attribute reflects.]
+    expected: FAIL
+
+  [aria-roledescription attribute reflects.]
+    expected: FAIL
+
+  [aria-haspopup attribute reflects.]
+    expected: FAIL
+
+  [aria-readonly attribute reflects.]
+    expected: FAIL
+
+  [aria-expanded attribute reflects.]
+    expected: FAIL
+
+  [aria-modal attribute reflects.]
+    expected: FAIL
+
+  [aria-keyshortcuts attribute reflects.]
+    expected: FAIL
+
+  [aria-multiline attribute reflects.]
+    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 c2d790b5256..47935172860 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -318,21 +318,18 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     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 279734168dc..a5b9b3752be 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,9 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
   [separate text/javascript;charset=windows-1252  text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 87c807a49ff..a63e414f43a 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20%40%23%24%23%25%25%26%5E%26%5E*()()11!%2Cnosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini b/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
index a3a600c5846..6bd06899fdd 100644
--- a/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
+++ b/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
@@ -1,5 +1,6 @@
 [embedded-credentials.tentative.sub.html]
   type: testharness
+  expected: TIMEOUT
   [Embedded credentials are treated as network errors.]
     expected: FAIL
 
@@ -10,5 +11,11 @@
     expected: FAIL
 
   [Embedded credentials matching the top-level are treated as network errors for cross-origin URLs.]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [Embedded credentials matching the top-level are not treated as network errors for same-origin URLs.]
+    expected: TIMEOUT
+
+  [Embedded credentials matching the top-level are not treated as network errors for relative URLs.]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html.ini
deleted file mode 100644
index e495b626d2e..00000000000
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[navigation-unload-same-origin-fragment.html]
-  [Tests that a fragment navigation in the unload handler will not block the initial navigation]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html.ini
new file mode 100644
index 00000000000..d2551ba514c
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html.ini
@@ -0,0 +1,4 @@
+[scroll-to-top.html]
+  [Fragment Navigation: When fragid is TOP scroll to the top of the document]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
rename to tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
index 51f8272a6de..75d75b4cda2 100644
--- 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_2.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_3.html]
+[traverse_the_history_2.html]
   [Multiple history traversals, last would be aborted]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/sandboxing/sandbox-new-execution-context.html.ini b/tests/wpt/metadata/html/browsers/sandboxing/sandbox-new-execution-context.html.ini
new file mode 100644
index 00000000000..49f4d547be4
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/sandboxing/sandbox-new-execution-context.html.ini
@@ -0,0 +1,4 @@
+[sandbox-new-execution-context.html]
+  [iframe with sandbox should load with new execution context]
+    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 00000000000..16fa2c5cfc1
--- /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 bf50d59df41..e02f179ec25 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-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 d1ed9088b2b..9027336b453 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 a70e9dbad4d..4e44584b123 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 779531b4a98..fcaeae5336d 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 7a1b258d52e..42327fedd27 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 caba4124f0b..a8e4fe06618 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 9ace8a4cbdb..e6b978f0b83 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
@@ -1,16 +1,17 @@
 [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
@@ -19,14 +20,20 @@
     expected: FAIL
 
   [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
 
+  [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-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 10f617db69e..8540f53d8d6 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 28f93ee71b5..9d841e61bc0 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 c757b400205..442db3cb549 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
@@ -1,5 +1,4 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
   [opener and "removed" embedded documents]
     expected: FAIL
 
@@ -7,5 +6,5 @@
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    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 5f82bb787e5..fd5db23d3fd 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
@@ -1,7 +1,11 @@
 [supported-elements.html]
+  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
   [Element with tabindex should support autofocus]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [Non-HTMLElement should not support autofocus]
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index f6a7aca3306..5f60c78e73c 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_escaping-3.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: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 3a32693ffa8..d43f38b40cd 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index dc856a3d5a3..e440b1e38c6 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
index f6eecd82b49..61799e4c935 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -1,5 +1,5 @@
 [form-double-submit-2.html]
   expected: ERROR
   [preventDefault should allow onclick submit() to succeed]
-    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 47a7bbb7975..dce74c6dd71 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/forms/form-submission-0/form-submission-algorithm.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
index 702af61a3c4..127392316de 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
@@ -1,11 +1,7 @@
 [form-submission-algorithm.html]
-  expected: TIMEOUT
   [If form's firing submission events is true, then return; 'submit' event]
     expected: FAIL
 
   [If form's firing submission events is true, then return; 'invalid' event]
     expected: FAIL
 
-  [Cannot navigate (after constructing the entry list)]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/semantics/forms/the-input-element/checkbox-detached-change-event.html.ini b/tests/wpt/metadata/html/semantics/forms/the-input-element/checkbox-detached-change-event.html.ini
new file mode 100644
index 00000000000..e599b1b9465
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/the-input-element/checkbox-detached-change-event.html.ini
@@ -0,0 +1,5 @@
+[checkbox-detached-change-event.html]
+  expected: TIMEOUT
+  [This test will pass if <input type=checkbox> emits change events while detached from document.body]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/forms/the-input-element/radio-detached-change-event.html.ini b/tests/wpt/metadata/html/semantics/forms/the-input-element/radio-detached-change-event.html.ini
new file mode 100644
index 00000000000..2c7029fa510
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/the-input-element/radio-detached-change-event.html.ini
@@ -0,0 +1,5 @@
+[radio-detached-change-event.html]
+  expected: TIMEOUT
+  [This test will pass if <input type=radio> emits change events while detached from document.body]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
deleted file mode 100644
index a9677391662..00000000000
--- a/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[DOMContentLoaded-defer.html]
-  [The end: DOMContentLoaded and defer scripts]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/resource-timing/nested-context-navigations-iframe.html.ini b/tests/wpt/metadata/resource-timing/nested-context-navigations-iframe.html.ini
index 8594361ff44..ec371a1bf72 100644
--- a/tests/wpt/metadata/resource-timing/nested-context-navigations-iframe.html.ini
+++ b/tests/wpt/metadata/resource-timing/nested-context-navigations-iframe.html.ini
@@ -1,5 +1,5 @@
 [nested-context-navigations-iframe.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Test that iframe navigations are not observable by the parent, even after history navigations by the parent]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/url/url-setters.html.ini b/tests/wpt/metadata/url/url-setters.html.ini
index 970009f11f2..2b0562b0334 100644
--- a/tests/wpt/metadata/url/url-setters.html.ini
+++ b/tests/wpt/metadata/url/url-setters.html.ini
@@ -1050,3 +1050,6 @@
   [URL: Setting <ssh://me@example.net>.protocol = 'https']
     expected: FAIL
 
+  [<area>: Setting <http://example.net>.host = '[2001:db8::2\]:4002' IPv6 literal address with port, crbug.com/1012416]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
new file mode 100644
index 00000000000..663a1f8fa30
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
@@ -0,0 +1,5 @@
+[018.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, javascript:]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/webxr/idlharness.https.window.js.ini b/tests/wpt/metadata/webxr/idlharness.https.window.js.ini
index a48d48dd278..fb2e8a3327e 100644
--- a/tests/wpt/metadata/webxr/idlharness.https.window.js.ini
+++ b/tests/wpt/metadata/webxr/idlharness.https.window.js.ini
@@ -170,3 +170,12 @@
   [WebGLRenderingContext includes WebGLRenderingContextBase: member names are unique]
     expected: FAIL
 
+  [XRSession interface: attribute onsqueeze]
+    expected: FAIL
+
+  [XRSession interface: attribute onsqueezestart]
+    expected: FAIL
+
+  [XRSession interface: attribute onsqueezeend]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
index 268949ced5c..f584fce5df1 100644
--- a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
+++ b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
@@ -1,4 +1,5 @@
 [005.html]
+  expected: ERROR
   [dedicated worker in shared worker in dedicated worker]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
index d6e39444229..49f489d2a1c 100644
--- a/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
+++ b/tests/wpt/metadata/workers/semantics/run-a-worker/003.html.ini
@@ -1,5 +1,6 @@
 [003.html]
   type: testharness
+  expected: ERROR
   [shared]
     expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/animation-worklet/stateful-animator.https.html b/tests/wpt/web-platform-tests/animation-worklet/stateful-animator.https.html
index b83590650b1..be29fa109cb 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/stateful-animator.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/stateful-animator.https.html
@@ -106,7 +106,7 @@
     do {
       await new Promise(window.requestAnimationFrame);
       let current_local_time = animation.effect.getComputedTiming().localTime;
-      if (last_local_time == current_local_time)
+      if (approxEquals(last_local_time, current_local_time))
         ++frame_count;
       else
         frame_count = 0;
@@ -121,7 +121,7 @@
     const LOCAL_TIME_RESET_CHECK = 3;
     do {
       await new Promise(window.requestAnimationFrame);
-      if (0 == animation.effect.getComputedTiming().localTime)
+      if (approxEquals(0, animation.effect.getComputedTiming().localTime))
         ++reset_count;
     } while (reset_count < LOCAL_TIME_RESET_CHECK);
   }
@@ -136,8 +136,8 @@
     // effect.localTime should be correctly increased upon global scope
     // switches for stateful animators.
     await waitForAnimationFrameWithCondition(_ => {
-      return animation.effect.getComputedTiming().localTime ==
-          EXPECTED_FRAMES_TO_A_SCOPE_SWITCH;
+      return approxEquals(animation.effect.getComputedTiming().localTime,
+          EXPECTED_FRAMES_TO_A_SCOPE_SWITCH);
     });
 
     animation.cancel();
@@ -165,7 +165,8 @@
     animation.play();
 
     await waitForAnimationFrameWithCondition(_ => {
-        return animation.effect.getComputedTiming().localTime == EXPECTED_FRAMES_TO_A_SCOPE_SWITCH;
+        return approxEquals(animation.effect.getComputedTiming().localTime,
+            EXPECTED_FRAMES_TO_A_SCOPE_SWITCH);
     });
 
     animation.cancel();
@@ -179,7 +180,7 @@
     animation.play();
 
     await waitForAnimationFrameWithCondition(_ => {
-        return animation.effect.getComputedTiming().localTime == 10000;
+        return approxEquals(animation.effect.getComputedTiming().localTime, 10000);
     });
 
     animation.cancel();
diff --git a/tests/wpt/web-platform-tests/conformance-checkers/html-aria/_functional/tree/js/prototype.js b/tests/wpt/web-platform-tests/conformance-checkers/html-aria/_functional/tree/js/prototype.js
index b0e0675867a..c14b177230a 100644
--- a/tests/wpt/web-platform-tests/conformance-checkers/html-aria/_functional/tree/js/prototype.js
+++ b/tests/wpt/web-platform-tests/conformance-checkers/html-aria/_functional/tree/js/prototype.js
@@ -2705,8 +2705,8 @@ document.viewport = {
 
   getScrollOffsets: function() {
     return Element._returnOffset(
-      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
-      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
+      window.pageXOffset || document.scrollingElement.scrollLeft,
+      window.pageYOffset || document.scrollingElement.scrollTop);
   }
 };
 /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
@@ -3751,10 +3751,8 @@ Event.Methods = (function() {
 
     pointer: function(event) {
       return {
-        x: event.pageX || (event.clientX +
-          (document.documentElement.scrollLeft || document.body.scrollLeft)),
-        y: event.pageY || (event.clientY +
-          (document.documentElement.scrollTop || document.body.scrollTop))
+        x: event.pageX || (event.clientX + document.scrollingElement.scrollLeft),
+        y: event.pageY || (event.clientY + document.scrollingElement.scrollTop)
       };
     },
 
@@ -4034,12 +4032,10 @@ var Position = {
   // page is scrolled
   prepare: function() {
     this.deltaX =  window.pageXOffset
-                || document.documentElement.scrollLeft
-                || document.body.scrollLeft
+                || document.scrollingElement.scrollLeft
                 || 0;
     this.deltaY =  window.pageYOffset
-                || document.documentElement.scrollTop
-                || document.body.scrollTop
+                || document.scrollingElement.scrollTop
                 || 0;
   },
 
diff --git a/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001-ref.html b/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001-ref.html
new file mode 100644
index 00000000000..50c682eddc7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001-ref.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<style>
+div {
+  text-indent: 3ch;
+}
+</style>
+<body>
+  <div>123456</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001.html b/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001.html
new file mode 100644
index 00000000000..b00c48156ed
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/positioning/line-break-after-leading-oof-001.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>CSS Test: Line wrapping after leading out-of-flow objects</title>
+<link rel="author" title="Koji Ishii" href="mailto:kojii@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#propdef-position">
+<style>
+div {
+  width: 5ch;
+  /* When the line was broken after the leading OOF, it is hardly visible
+     because it is an empty line box.
+     Applying `text-indent` can make it visible; if the line is indented,
+     it is the first line, proving the line did not wrap. */
+  text-indent: 3ch;
+}
+</style>
+<body>
+  <div><span style="position: absolute"></span>123456</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-001-manual.html b/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-001-manual.html
index 7c38164b2d8..21766723672 100644
--- a/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-001-manual.html
+++ b/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-001-manual.html
@@ -32,8 +32,8 @@
 <body>
   <p>
     Test passes if there is a filled color square with 'Filler Text',
-    whose color gradually changes in the order:
-    YELLOW to GREEN to BLUE.
+    whose color gradually changes in the order: YELLOW to GREEN.
+    After the animation is finished, the color goes back to BLUE.
   </p>
   <div>Filler Text</div>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-003-manual.html b/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-003-manual.html
index bd5a93245b3..561237d2673 100644
--- a/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-003-manual.html
+++ b/tests/wpt/web-platform-tests/css/css-animations/animation-fill-mode-003-manual.html
@@ -37,8 +37,8 @@
 <body>
   <p>
     Test passes if there is a filled color square with 'Filler Text',
-    whose color gradually changes in the order:
-    YELLOW to GREEN to BLUE.
+    whose color gradually changes in the order: YELLOW to GREEN.
+    After the animation is finished, the color goes back to BLUE.
   </p>
   <div>Filler Text</div>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi-ref.html b/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi-ref.html
new file mode 100644
index 00000000000..cf213d731f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi-ref.html
@@ -0,0 +1,125 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Reference: Symbol markers with unicode-bidi</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<style>
+section {
+  float: left;
+}
+.inside {
+  list-style-position: inside;
+}
+span {
+  float: right;
+}
+</style>
+<section>
+  <ul dir="ltr">
+    <li class="outside embed-none">text</li>
+    <li class="outside embed-item">text</li>
+    <li class="outside embed-marker">text</li>
+    <li class="outside embed-both">text</li>
+    <li class="inside embed-none">text</li>
+    <li class="inside embed-item">text</li>
+    <li class="inside embed-marker">text</li>
+    <li class="inside embed-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside override-none">text</li>
+    <li class="outside override-item">text</li>
+    <li class="outside override-marker">text</li>
+    <li class="outside override-both">text</li>
+    <li class="inside override-none">text</li>
+    <li class="inside override-item">text</li>
+    <li class="inside override-marker">text</li>
+    <li class="inside override-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside override-none">text</li>
+    <li class="outside override-item">txet</li>
+    <li class="outside override-marker">text</li>
+    <li class="outside override-both">txet</li>
+    <li class="inside override-none">text</li>
+    <li class="inside override-item">txet</li>
+    <li class="inside override-marker">text</li>
+    <li class="inside override-both">txet</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside isolateoverride-none">text</li>
+    <li class="outside isolateoverride-item">text</li>
+    <li class="outside isolateoverride-marker">text</li>
+    <li class="outside isolateoverride-both">text</li>
+    <li class="inside isolateoverride-none">text</li>
+    <li class="inside isolateoverride-item">text</li>
+    <li class="inside isolateoverride-marker">text</li>
+    <li class="inside isolateoverride-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolateoverride-none">text</li>
+    <li class="outside isolateoverride-item">txet</li>
+    <li class="outside isolateoverride-marker">text</li>
+    <li class="outside isolateoverride-both">txet</li>
+    <li class="inside isolateoverride-none">text</li>
+    <li class="inside isolateoverride-item">txet</li>
+    <li class="inside isolateoverride-marker">text</li>
+    <li class="inside isolateoverride-both">txet</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside plaintext-none">text</li>
+    <li class="outside plaintext-item">text</li>
+    <li class="outside plaintext-marker">text</li>
+    <li class="outside plaintext-both">text</li>
+    <li class="inside plaintext-none">text</li>
+    <li class="inside plaintext-item">text</li>
+    <li class="inside plaintext-marker">text</li>
+    <li class="inside plaintext-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside plaintext-none">text</li>
+    <li class="outside plaintext-item">text</li>
+    <li class="outside plaintext-marker">text</li>
+    <li class="outside plaintext-both">text</li>
+    <li class="inside plaintext-none">text</li>
+    <li class="inside plaintext-item"><span>text</span></li>
+    <li class="inside plaintext-marker">text</li>
+    <li class="inside plaintext-both"><span>text</span></li>
+  </ul>
+</section>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi.html b/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi.html
new file mode 100644
index 00000000000..e82d9ae1567
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-lists/list-marker-symbol-bidi.html
@@ -0,0 +1,147 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Symbol markers with unicode-bidi</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-lists/#markers" title="3. Markers">
+<link rel="match" href="list-marker-symbol-bidi-ref.html">
+<meta name="assert" content="This test checks that symbol markers are painted independently of unicode-bidi.">
+<style>
+section {
+  float: left;
+}
+.inside {
+  list-style-position: inside;
+}
+.embed-item, .embed-both {
+  unicode-bidi: embed;
+}
+.isolate-item, .isolate-both {
+  unicode-bidi: isolate;
+}
+.override-item, .override-both {
+  unicode-bidi: bidi-override;
+}
+.isolateoverride-item, .isolateoverride-both {
+  unicode-bidi: isolate-override;
+}
+.plaintext-item, .plaintext-both {
+  unicode-bidi: plaintext;
+}
+.embed-item::marker, .embed-none::marker,
+.isolate-item::marker, .isolate-none::marker,
+.override-item::marker, .override-none::marker,
+.paintext-item::marker, .paintext-none::marker,
+.isolateoverride-item::marker, .isolateoverride-none::marker {
+  unicode-bidi: normal;
+}
+</style>
+<section>
+  <ul dir="ltr">
+    <li class="outside embed-none">text</li>
+    <li class="outside embed-item">text</li>
+    <li class="outside embed-marker">text</li>
+    <li class="outside embed-both">text</li>
+    <li class="inside embed-none">text</li>
+    <li class="inside embed-item">text</li>
+    <li class="inside embed-marker">text</li>
+    <li class="inside embed-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolate-none">text</li>
+    <li class="outside isolate-item">text</li>
+    <li class="outside isolate-marker">text</li>
+    <li class="outside isolate-both">text</li>
+    <li class="inside isolate-none">text</li>
+    <li class="inside isolate-item">text</li>
+    <li class="inside isolate-marker">text</li>
+    <li class="inside isolate-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside override-none">text</li>
+    <li class="outside override-item">text</li>
+    <li class="outside override-marker">text</li>
+    <li class="outside override-both">text</li>
+    <li class="inside override-none">text</li>
+    <li class="inside override-item">text</li>
+    <li class="inside override-marker">text</li>
+    <li class="inside override-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside override-none">text</li>
+    <li class="outside override-item">text</li>
+    <li class="outside override-marker">text</li>
+    <li class="outside override-both">text</li>
+    <li class="inside override-none">text</li>
+    <li class="inside override-item">text</li>
+    <li class="inside override-marker">text</li>
+    <li class="inside override-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside isolateoverride-none">text</li>
+    <li class="outside isolateoverride-item">text</li>
+    <li class="outside isolateoverride-marker">text</li>
+    <li class="outside isolateoverride-both">text</li>
+    <li class="inside isolateoverride-none">text</li>
+    <li class="inside isolateoverride-item">text</li>
+    <li class="inside isolateoverride-marker">text</li>
+    <li class="inside isolateoverride-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside isolateoverride-none">text</li>
+    <li class="outside isolateoverride-item">text</li>
+    <li class="outside isolateoverride-marker">text</li>
+    <li class="outside isolateoverride-both">text</li>
+    <li class="inside isolateoverride-none">text</li>
+    <li class="inside isolateoverride-item">text</li>
+    <li class="inside isolateoverride-marker">text</li>
+    <li class="inside isolateoverride-both">text</li>
+  </ul>
+</section>
+<section>
+  <ul dir="ltr">
+    <li class="outside plaintext-none">text</li>
+    <li class="outside plaintext-item">text</li>
+    <li class="outside plaintext-marker">text</li>
+    <li class="outside plaintext-both">text</li>
+    <li class="inside plaintext-none">text</li>
+    <li class="inside plaintext-item">text</li>
+    <li class="inside plaintext-marker">text</li>
+    <li class="inside plaintext-both">text</li>
+  </ul>
+  <ul dir="rtl">
+    <li class="outside plaintext-none">text</li>
+    <li class="outside plaintext-item">text</li>
+    <li class="outside plaintext-marker">text</li>
+    <li class="outside plaintext-both">text</li>
+    <li class="inside plaintext-none">text</li>
+    <li class="inside plaintext-item">text</li>
+    <li class="inside plaintext-marker">text</li>
+    <li class="inside plaintext-both">text</li>
+  </ul>
+</section>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/nested-list-with-list-style-type-none.html b/tests/wpt/web-platform-tests/css/css-lists/nested-list-with-list-style-type-none.html
index e103113c3f4..325459df8a2 100644
--- a/tests/wpt/web-platform-tests/css/css-lists/nested-list-with-list-style-type-none.html
+++ b/tests/wpt/web-platform-tests/css/css-lists/nested-list-with-list-style-type-none.html
@@ -19,6 +19,11 @@ li {
     </li>
   </ul>
   <script type="text/javascript">
+    setup({ single_test: true });
+    // TODO(jugglinmike): If accepted, WPT RFC #33 will introduce a new test
+    // type intended to simplify tests like this one. Refactor this test to the
+    // new test type following its acceptance.
+    // https://github.com/web-platform-tests/rfcs/pull/33
     done();
   </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html b/tests/wpt/web-platform-tests/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html
index 4997ae4f564..05c23a3bc14 100644
--- a/tests/wpt/web-platform-tests/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html
@@ -3,7 +3,7 @@
 <title>CSS Pseudo-Elements Test: Parsing tree-abiding pseudo-elements</title>
 <link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#treelike">
 <link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
-<meta name="assert" content="This test checks that gutters adjacent to collapsed tracks don't reduce the space available for aligning adjacent grid items." />
+<meta name="assert" content="This test checks the validity of various selectors containing tree-abiding pseudo-elements." />
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-break-all-inline-008.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-break-all-inline-008.html
new file mode 100644
index 00000000000..930ae436fe4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-break-all-inline-008.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html lang=en>
+<meta charset="utf-8">
+<title>word-break: break-all on inline element</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="5.2. Breaking Rules for Letters: the word-break property" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-all">
+<meta name="flags" content="Ahem">
+<link rel="match" href="reference/word-break-break-all-010-ref.html">
+<meta name="assert" content="break-all doesn't allow breaking around punctuation characters">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+    font: 50px / 1 Ahem;
+}
+.fail {
+    background: green;
+    position: absolute;
+    color: red;
+    height: 100px;
+    z-index: -1;
+}
+.test {
+    color: green;
+    width: 1em;
+
+    word-break: break-all;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="fail">XX</div>
+<div class="test"><span>X</span><span>.</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-001.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-001.html
new file mode 100644
index 00000000000..20b610180b3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-001.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: word-break: break-word and intrinsic sizing</title>
+<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">
+<meta name="flags" content="">
+<link rel="match" href="../overflow-wrap/reference/overflow-wrap-min-content-size-001-ref.html">
+<meta name="assert" content="word-break: break-word should behave as overflow-wrap: anywhere, so breaking opportunities **are** considered when calculating min-content intrinsic sizes.">
+<style>
+table {
+  word-break: break-word;
+  max-width: 0;
+  border: 0;
+  border-collapse: collapse;
+}
+td {
+  padding: 0;
+  background: green;
+  color: transparent;
+}
+#red {
+  position: absolute;
+  z-index: -1;
+  background: red;
+  color: transparent;
+}
+</style>
+
+<p>Test passes if there is a green box below and no red.
+<div id=red>X<br>X<br>X<br>X</div>
+<table><tr><td>XXXX</table>
+
+<!--
+  width:min-content on the div directly without using a table
+  would achieve the goal of this test, and be a lot simpler.
+
+  However, width:min-content is not yet widely supported.
+
+  Using a table, and forcing it to be as small as possible
+  will achieve min-content sizing of the div in all browsers.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-002.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-002.html
new file mode 100644
index 00000000000..0f5d18ff4b2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-002.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: word-break: break-word and intrinsic sizing</title>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">
+<meta name="flags" content="ahem">
+<link rel="match" href="../overflow-wrap/reference/overflow-wrap-min-content-size-003-ref.html">
+<meta name="assert" content="word-break: break-word should behave as overflow-wrap: anywhere, so breaks at edge of inline elements.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#wrapper {
+  width: 0px;
+  font: 16px / 1 Ahem;
+  word-break: break-word;
+  color: green;
+}
+#test {
+  float: left;
+}
+#reference {
+  position: absolute;
+  width: 16px;
+  height: 128px;
+  background: red;
+  z-index: -1;
+}
+</style>
+
+<p>Test passes if there is a vertical green bar below.
+<div id="wrapper">
+  <div id="reference"></div>
+  <div id="test"><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-003.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-003.html
new file mode 100644
index 00000000000..84e7cfe872f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-003.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: word-break: break-word and intrinsic sizing</title>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">
+<meta name="flags" content="ahem">
+<link rel="match" href="reference/word-break-break-all-010-ref.html">
+<meta name="assert" content="word-break: break-all shouldn't allow breaking before punctuation characters.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+    font: 50px / 1 Ahem;
+}
+.fail {
+    background: red;
+    position: absolute;
+    color: green;
+    z-index: -1;
+}
+.test {
+    color: green;
+    width: min-content;
+    word-break: break-all;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="fail"><br>XX</div>
+<div class="test"><span>X</span><span>.</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-004.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-004.html
new file mode 100644
index 00000000000..efa61b9cd8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-004.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: word-break: break-word and intrinsic sizing</title>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">
+<meta name="flags" content="ahem">
+<link rel="match" href="reference/word-break-break-all-010-ref.html">
+<meta name="assert" content="word-break: break-word allows breaking before punctuation characters and it should be considered when computing the min-content size.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+    font: 50px / 1 Ahem;
+}
+.fail {
+    background: green;
+    position: absolute;
+    color: red;
+    width: 100px;
+    z-index: -1;
+}
+.test {
+    color: green;
+    width: min-content;
+    word-break: break-word;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="fail">X<br>X</div>
+<div class="test"><span>X</span><span>.</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-005.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-005.html
new file mode 100644
index 00000000000..ccbf9887054
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-005.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: word-break: break-word and intrinsic sizing</title>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#word-break-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">
+<meta name="flags" content="ahem">
+<link rel="match" href="../overflow-wrap/reference/overflow-wrap-min-content-size-003-ref.html">
+<meta name="assert" content="word-break: break-word should behave as overflow-wrap: anywhere, so breaks at edge of inline elements.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#wrapper {
+  width: 0px;
+  font: 16px / 1 Ahem;
+  word-break: break-word;
+  color: green;
+}
+#test {
+  float: left;
+}
+#reference {
+  position: absolute;
+  width: 16px;
+  height: 128px;
+  background: red;
+  z-index: -1;
+}
+</style>
+
+<p>Test passes if there is a vertical green bar below.
+<div id="wrapper">
+  <div id="reference"></div>
+  <div id="test"><span>XX</span><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span><span>X</span></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-006.html b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-006.html
new file mode 100644
index 00000000000..0d772a2d88c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/word-break/word-break-min-content-006.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: overflow-wrap: anywhere and intrinsic sizing</title>
+<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org/">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#overflow-wrap-property">
+<meta name="flags" content="">
+<link rel="match" href="../overflow-wrap/reference/overflow-wrap-min-content-size-002-ref.html">
+<meta name="assert" content="overflow-wrap:anywhere doesn't break grapheme cluster and min-content intrinsic size should take that into account.">
+<style>
+#wrapper {
+  width: 0px;
+  word-break: break-word;
+}
+#test {
+  float: left;
+  border: 2px solid blue;
+}
+</style>
+
+<p>Test passes if the glyphs are completely inside the blue box.
+<div id="wrapper">
+  <div id="test">&#x0ba8;&#x0bbf;&#x0bbf;&#x0bbf;&#x0bbf;&#x0ba8;&#x0bbf;&#x0bbf;&#x0bbf;&#x0bbf;</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004-ref.xht b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004-ref.xht
index 5f971974b8d..a7557f92823 100644
--- a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004-ref.xht
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004-ref.xht
@@ -41,7 +41,7 @@
   <div>01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00</div>
 
 <script>
-  document.documentElement.scrollLeft=document.documentElement.scrollWidth;
+  document.scrollingElement.scrollLeft=document.scrollingElement.scrollWidth;
 </script>
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004.xht b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004.xht
index cd1529ce421..b7322a0083c 100644
--- a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004.xht
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vlr-004.xht
@@ -101,7 +101,7 @@
   </div>
 
 <script>
-  document.documentElement.scrollLeft=document.documentElement.scrollWidth;
+  document.scrollingElement.scrollLeft=document.scrollingElement.scrollWidth;
 </script>
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vrl-001-ref.xht b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vrl-001-ref.xht
index 297457f62c2..e423259f0db 100644
--- a/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vrl-001-ref.xht
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/sizing-orthog-htb-in-vrl-001-ref.xht
@@ -75,7 +75,7 @@
   </table>
 
 <script>
-  document.documentElement.scrollLeft=document.documentElement.scrollWidth;
+  document.scrollingElement.scrollLeft=document.scrollingElement.scrollWidth;
 </script>
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-lr.html b/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-lr.html
index 8c59532b1a5..ecab4a84e22 100644
--- a/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-lr.html
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-lr.html
@@ -18,19 +18,19 @@
 <body>
 <script>
   test(function() {
-    assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
+    assert_equals(document.scrollingElement.scrollLeft, 0, "scrollLeft should be 0.");
   }, "Check initial scroll position of viewport.");
 
   test(function() {
-    document.documentElement.scrollLeft = -1000;
-    assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
+    document.scrollingElement.scrollLeft = -1000;
+    assert_equals(document.scrollingElement.scrollLeft, 0, "scrollLeft should be 0.");
   }, "Scroll to scrollLeft = -1000 should not be possible.");
 
   test(function() {
-    document.documentElement.scrollLeft = 1000;
-    assert_equals(document.documentElement.scrollLeft, 1000, "scrollLeft should be 1000.");
+    document.scrollingElement.scrollLeft = 1000;
+    assert_equals(document.scrollingElement.scrollLeft, 1000, "scrollLeft should be 1000.");
   }, "Scroll to scrollLeft = 1000 should be possible.");
 
   // Reset back to horizontal-tb to make the result readable on-screen.
-  document.documentElement.className = "result-wm";
+  document.scrollingElement.className = "result-wm";
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-rl.html b/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-rl.html
index 523928f9ad8..eb327b00c09 100644
--- a/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-rl.html
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/wm-propagation-body-scroll-offset-vertical-rl.html
@@ -18,19 +18,19 @@
 <body>
 <script>
   test(function() {
-    assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
+    assert_equals(document.scrollingElement.scrollLeft, 0, "scrollLeft should be 0.");
   }, "Check initial scroll position of viewport.");
 
   test(function() {
-    document.documentElement.scrollLeft = -1000;
-    assert_equals(document.documentElement.scrollLeft, -1000, "scrollLeft should be -1000.");
+    document.scrollingElement.scrollLeft = -1000;
+    assert_equals(document.scrollingElement.scrollLeft, -1000, "scrollLeft should be -1000.");
   }, "Scroll to scrollLeft = -1000 should be possible.");
 
   test(function() {
-    document.documentElement.scrollLeft = 1000;
-    assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
+    document.scrollingElement.scrollLeft = 1000;
+    assert_equals(document.scrollingElement.scrollLeft, 0, "scrollLeft should be 0.");
   }, "Scroll to scrollLeft = 1000 should not be possible.");
 
   // Reset back to horizontal-tb to make the result readable on-screen.
-  document.documentElement.className = "result-wm";
+  document.scrollingElement.className = "result-wm";
 </script>
diff --git a/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-1.png b/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-1.png
new file mode 100644
index 00000000000..5195ba25ae6
Binary files /dev/null and b/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-1.png differ
diff --git a/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-2.png b/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-2.png
new file mode 100644
index 00000000000..0010a571731
Binary files /dev/null and b/tests/wpt/web-platform-tests/docs/assets/testharness-tutorial-test-screenshot-2.png differ
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/index.md b/tests/wpt/web-platform-tests/docs/writing-tests/index.md
index c4da79c0d8a..88e279b0ad1 100644
--- a/tests/wpt/web-platform-tests/docs/writing-tests/index.md
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/index.md
@@ -26,6 +26,7 @@ There's also a load of [general guidelines](general-guidelines) that apply to al
    testdriver
    testdriver-tutorial
    testharness
+   testharness-tutorial
    tools
    visual
    wdspec
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/testharness-tutorial.md b/tests/wpt/web-platform-tests/docs/writing-tests/testharness-tutorial.md
new file mode 100644
index 00000000000..dceb674ac4d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/testharness-tutorial.md
@@ -0,0 +1,393 @@
+# testharness.js tutorial
+
+<!--
+Note to maintainers:
+
+This tutorial is designed to be an authentic depiction of the WPT contribution
+experience. It is not intended to be comprehensive; its scope is intentionally
+limited in order to demonstrate authoring a complete test without overwhelming
+the reader with features. Because typical WPT usage patterns change over time,
+this should be updated periodically; please weigh extensions against the
+demotivating effect that a lengthy guide can have on new contributors.
+-->
+
+Let's say you've discovered that WPT doesn't have any tests for how [the Fetch
+API](https://fetch.spec.whatwg.org/) sets cookies from an HTTP response. This
+tutorial will guide you through the process of writing a test for the
+web-platform, verifying it, and submitting it back to WPT. Although it includes
+some very brief instructions on using git, you can find more guidance in [the
+tutorial for git and GitHub](github-intro).
+
+WPT's testharness.js is a framework designed to help people write tests for the
+web platform's JavaScript APIs. [The testharness.js reference
+page](testharness) describes the framework in the abstract, but for the
+purposes of this guide, we'll only consider the features we need to test the
+behavior of `fetch`.
+
+```eval_rst
+.. contents::
+   :local:
+```
+
+## Setting up your workspace
+
+To make sure you have the latest code, first type the following into a terminal
+located in the root of the WPT git repository:
+
+    $ git fetch git@github.com:web-platform-tests/wpt.git
+
+Next, we need a place to store the change set we're about to author. Here's how
+to create a new git branch named `fetch-cookie` from the revision of WPT we
+just downloaded:
+
+    $ git checkout -b fetch-cookie FETCH_HEAD
+
+The tests we're going to write will rely on special abilities of the WPT
+server, so you'll also need to [configure your system to run
+WPT](../running-tests/from-local-system) before you continue.
+
+With that out of the way, you're ready to create your patch.
+
+## Writing a subtest
+
+<!--
+Goals of this section:
+
+- demonstrate asynchronous testing with Promises
+- motivate non-trivial integration with WPT server
+- use web technology likely to be familiar to web developers
+- use web technology likely to be supported in the reader's browser
+-->
+
+The first thing we'll do is configure the server to respond to a certain request
+by setting a cookie. Once that's done, we'll be able to make the request with
+`fetch` and verify that it interpreted the response correctly.
+
+We'll configure the server with an "asis" file. That's the WPT convention for
+controlling the contents of an HTTP response. [You can read more about it
+here](server-features), but for now, we'll save the following text into a file
+named `set-cookie.asis` in the `fetch/api/basic/` directory of WPT:
+
+```
+HTTP/1.1 204 No Content
+Set-Cookie: test1=t1
+```
+
+With this in place, any requests to `/fetch/api/basic/set-cookie.asis` will
+receive an HTTP 204 response that sets the cookie named `test1`. When writing
+more tests in the future, you may want the server to behave more dynamically.
+In that case, [you can write Python code to control how the server
+responds](python-handlers/index).
+
+Now, we can write the test! Create a new file named `set-cookie.html` in the
+same directory and insert the following text:
+
+```html
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>fetch: setting cookies</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+promise_test(function() {
+  return fetch('set-cookie.asis')
+    .then(function() {
+        assert_equals(document.cookie, 'test1=t1');
+      });
+});
+</script>
+```
+
+Let's step through each part of this file.
+
+- ```html
+  <!DOCTYPE html>
+  <meta charset="utf-8">
+  ```
+
+  We explicitly set the DOCTYPE and character set to be sure that browsers
+  don't infer them to be something we aren't expecting. We're omitting the
+  `<html>` and `<head>` tags. That's a common practice in WPT, preferred
+  because it makes tests more concise.
+
+- ```html
+  <title>fetch: setting cookies</title>
+  ```
+  The document's title should succinctly describe the feature under test.
+
+- ```html
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  ```
+
+  These two `<script>` tags retrieve the code that powers testharness.js. A
+  testharness.js test can't run without them!
+
+- ```html
+  <script>
+  promise_test(function() {
+    return fetch('thing.asis')
+      .then(function() {
+          assert_equals(document.cookie, 'test1=t1');
+        });
+  });
+  </script>
+  ```
+
+  This script uses the testharness.js function `promise_test` to define a
+  "subtest". We're using that because the behavior we're testing is
+  asynchronous. By returning a Promise value, we tell the harness to wait until
+  that Promise settles. The harness will report that the test has passed if
+  the Promise is fulfilled, and it will report that the test has failed if the
+  Promise is rejected.
+
+  We invoke the global `fetch` function to exercise the "behavior under test,"
+  and in the fulfillment handler, we verify that the expected cookie is set.
+  We're using the testharness.js `assert_equals` function to verify that the
+  value is correct; the function will throw an error otherwise. That will cause
+  the Promise to be rejected, and *that* will cause the harness to report a
+  failure.
+
+If you run the server according to the instructions in [the guide for local
+configuration](../running-tests/from-local-system), you can access the test at
+[http://web-platform.test:8000/fetch/api/basic/set-cookie.html](http://web-platform.test:8000/fetch/api/basic/set-cookie.html.).
+You should see something like this:
+
+![](../assets/testharness-tutorial-test-screenshot-1.png "screen shot of testharness.js reporting the test results")
+
+## Refining the subtest
+
+<!--
+Goals of this section:
+
+- explain the motivation for "clean up" logic and demonstrate its usage
+- motivate explicit test naming
+-->
+
+We'd like to test a little more about `fetch` and cookies, but before we do,
+there are some improvements we can make to what we've written so far.
+
+For instance, we should remove the cookie after the subtest is complete. This
+ensures a consistent state for any additional subtests we may add and also for
+any tests that follow. We'll use the `add_cleanup` method to ensure that the
+cookie is deleted even if the test fails.
+
+```diff
+-promise_test(function() {
++promise_test(function(t) {
++  t.add_cleanup(function() {
++    document.cookie = 'test1=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
++  });
++
+   return fetch('thing.asis')
+     .then(function() {
+         assert_equals(document.cookie, 'test1=t1');
+       });
+ });
+```
+
+Although we'd prefer it if there were no other cookies defined during our test,
+we shouldn't take that for granted. As written, the test will fail if the
+`document.cookie` includes additional cookies. We'll use slightly more
+complicated logic to test for the presence of the expected cookie.
+
+
+```diff
+ promise_test(function(t) {
+   t.add_cleanup(function() {
+     document.cookie = 'test1=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
+   });
+
+   return fetch('thing.asis')
+     .then(function() {
+-        assert_equals(document.cookie, 'test1=t1');
++        assert_true(/(^|; )test1=t1($|;)/.test(document.cookie);
+       });
+ });
+```
+
+In the screen shot above, the subtest's result was reported using the
+document's title, "fetch: setting cookies". Since we expect to add another
+subtest, we should give this one a more specific name:
+
+```diff
+ promise_test(function(t) {
+   t.add_cleanup(function() {
+     document.cookie = 'test1=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
+   });
+
+   return fetch('thing.asis')
+     .then(function() {
+         assert_true(/(^|; )test1=t1($|;)/.test(document.cookie));
+       });
+-});
++}, 'cookie set for successful request');
+```
+
+## Writing a second subtest
+
+<!--
+Goals of this section:
+
+- introduce the concept of cross-domain testing and the associated tooling
+- demonstrate how to verify promise rejection
+- demonstrate additional assertion functions
+-->
+
+There are many things we might want to verify about how `fetch` sets cookies.
+For instance, it should *not* set a cookie if the request fails due to
+cross-origin security restrictions. Let's write a subtest which verifies that.
+
+We'll add another `<script>` tag for a JavaScript support file:
+
+```diff
+ <!DOCTYPE html>
+ <meta charset="utf-8">
+ <title>fetch: setting cookies</title>
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
++<script src="/common/get-host-info.sub.js"></script>
+```
+
+`get-host-info.sub.js` is a general-purpose script provided by WPT. It's
+designed to help with testing cross-domain functionality. Since it's stored in
+WPT's `common/` directory, tests from all sorts of specifications rely on it.
+
+Next, we'll define the new subtest inside the same `<script>` tag that holds
+our first subtest.
+
+```js
+promise_test(function(t) {
+  t.add_cleanup(function() {
+    document.cookie = 'test1=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
+  });
+  const url = get_host_info().HTTP_NOTSAMESITE_ORIGIN +
+    '/fetch/api/basic/set-cookie.asis';
+
+  return fetch(url)
+    .then(function() {
+        assert_unreached('The promise for the aborted fetch operation should reject.');
+      }, function() {
+        assert_false(/(^|; )test1=t1($|;)/.test(document.cookie));
+      });
+}, 'no cookie is set for cross-domain fetch operations');
+```
+
+This may look familiar from the previous subtest, but there are some important
+differences.
+
+- ```js
+  const url = get_host_info().HTTP_NOTSAMESITE_ORIGIN +
+    '/fetch/api/basic/set-cookie.asis';
+  ```
+
+  We're requesting the same resource, but we're referring to it with an
+  alternate host name. The name of the host depends on how the WPT server has
+  been configured, so we rely on the helper to provide an appropriate value.
+
+- ```js
+  return fetch(url)
+    .then(function() {
+        assert_unreached('The promise for the aborted fetch operation should reject.');
+      }, function() {
+        assert_false(/(^|; )test1=t1($|;)/.test(document.cookie));
+      });
+  ```
+
+  We're returning a Promise value, just like the first subtest. This time, we
+  expect the operation to fail, so the Promise should be rejected. To express
+  this, we've used `assert_unreached` *in the fulfillment handler*.
+  `assert_unreached` is a testharness.js utility function which always throws
+  an error. With this in place, if fetch does *not* produce an error, then this
+  subtest will fail.
+
+  We've moved the assertion about the cookie to the rejection handler. We also
+  switched from `assert_true` to `assert_false` because the test should only
+  pass if the cookie is *not* set. It's a good thing we have the cleanup logic
+  in the previous subtest, right?
+
+If you run the test in your browser now, you can expect to see both tests
+reported as passing with their distinct names.
+
+![](../assets/testharness-tutorial-test-screenshot-2.png "screen shot of testharness.js reporting the test results")
+
+## Verifying our work
+
+We're done writing the test, but we should make sure it fits in with the rest
+of WPT before we submit it.
+
+[The lint tool](lint-tool) can detect some of the common mistakes people make
+when contributing to WPT. You enabled it when you [configured your system to
+work with WPT](../running-tests/from-local-system). To run it, open a
+command-line terminal, navigate to the root of the WPT repository, and enter
+the following command:
+
+    python ./wpt lint fetch/api/basic
+
+If this recognizes any of those common mistakes in the new files, it will tell
+you where they are and how to fix them. If you do have changes to make, you can
+run the command again to make sure you got them right.
+
+Now, we'll run the test using the automated test runner. This is important for
+testharness.js tests because there are subtleties of the automated test runner
+which can influence how the test behaves. That's not to say your test has to
+pass in all browsers (or even in *any* browser). But if we expect the test to
+pass, then running it this way will help us catch other kinds of mistakes.
+
+The tools support running the tests in many different browsers. We'll use
+Firefox this time:
+
+    python ./wpt run firefox fetch/api/basic/set-cookie.html
+
+We expect this test to pass, so if it does, we're ready to submit it. If we
+were testing a web-platform feature that Firefox didn't support, we would
+expect the test to fail instead.
+
+There are a few problems to look out for in addition to passing/failing status.
+The report will describe fewer tests than we expect if the test isn't run at
+all. That's usually a sign of a formatting mistake, so you'll want to make sure
+you've used the right file names and metadata. Separately, the web browser
+might crash. That's often a sign of a browser bug, so you should consider
+[reporting it to the browser's
+maintainers](https://rachelandrew.co.uk/archives/2017/01/30/reporting-browser-bugs/)!
+
+## Submitting the test
+
+First, let's stage the new files for committing:
+
+    $ git add fetch/api/basic/set-cookie.asis
+    $ git add fetch/api/basic/set-cookie.html
+
+We can make sure the commit has everything we want to submit (and nothing we
+don't) by using `git diff`:
+
+    $ git diff --staged
+
+On most systems, you can use the arrow keys to navigate through the changes,
+and you can press the `q` key when you're done reviewing.
+
+Next, we'll create a commit with the staged changes:
+
+    $ git commit -m '[fetch] Add test for setting cookies'
+
+And now we can push the commit to our fork of WPT:
+
+    $ git push origin fetch-cookie
+
+The last step is to submit the test for review. WPT doesn't actually need the
+test we wrote in this tutorial, but if we wanted to submit it for inclusion in
+the repository, we would create a pull request on GitHub. [The guide on git and
+GitHub](github-intro) has all the details on how to do that.
+
+## More practice
+
+Here are some ways you can keep experimenting with WPT using this test:
+
+- Improve the test's readability by defining helper functions like
+  `cookieIsSet` and `deleteCookie`
+- Improve the test's coverage by refactoring it into [a "multi-global"
+  test](testharness)
+- Improve the test's coverage by writing more subtests (e.g. the behavior when
+  the fetch operation is aborted by `window.stop`, or the behavior when the
+  HTTP response sets multiple cookies)
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/testharness.md b/tests/wpt/web-platform-tests/docs/writing-tests/testharness.md
index 7d38742a740..17ee097ce18 100644
--- a/tests/wpt/web-platform-tests/docs/writing-tests/testharness.md
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/testharness.md
@@ -25,6 +25,10 @@ documented in two sections:
 See [server features](server-features) for advanced testing features that are commonly used
 with testharness.js. See also the [general guidelines](general-guidelines) for all test types.
 
+This page describes testharness.js exhaustively; [the tutorial on writing a
+testharness.js test](testharness-tutorial) provides a concise guide to writing
+a test--a good place to start for newcomers to the project.
+
 ## Variants
 
 A test file can have multiple variants by including `meta` elements,
diff --git a/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-own-props.html b/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-own-props.html
new file mode 100644
index 00000000000..1f21c0837ec
--- /dev/null
+++ b/tests/wpt/web-platform-tests/dom/collections/HTMLCollection-own-props.html
@@ -0,0 +1,109 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>HTMLCollection getters and own properties</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+function append(t, tag, name) {
+  var element = document.createElement(tag);
+  if (name) {
+    element.id = name;
+  }
+  document.body.appendChild(element);
+  t.add_cleanup(function() { element.remove(); });
+  return element;
+}
+
+test(function() {
+  var name = "named", tag = "a";
+  var c = document.getElementsByTagName(tag);
+  var element = append(this, tag, name);
+  assert_equals(c[name], element);
+  c[name] = "foo";
+  assert_equals(c[name], element);
+}, "Setting non-array index while named property exists (loose)");
+
+test(function() {
+  "use strict";
+  var name = "named", tag = "b";
+  var c = document.getElementsByTagName(tag);
+  var element = append(this, tag, name);
+  assert_equals(c[name], element);
+  assert_throws(new TypeError(), function() {
+    c[name] = "foo";
+  });
+  assert_equals(c[name], element);
+}, "Setting non-array index while named property exists (strict)");
+
+test(function() {
+  var name = "named", tag = "i";
+  var c = document.getElementsByTagName(tag);
+  assert_equals(c[name], undefined);
+  c[name] = "foo";
+  assert_equals(c[name], "foo");
+
+  var element = append(this, tag, name);
+  assert_equals(c[name], "foo");
+  assert_equals(c.namedItem(name), element);
+}, "Setting non-array index while named property doesn't exist (loose)");
+
+test(function() {
+  "use strict";
+  var name = "named", tag = "p";
+  var c = document.getElementsByTagName(tag);
+  assert_equals(c[name], undefined);
+  c[name] = "foo";
+  assert_equals(c[name], "foo");
+
+  var element = append(this, tag, name);
+  assert_equals(c[name], "foo");
+  assert_equals(c.namedItem(name), element);
+}, "Setting non-array index while named property doesn't exist (strict)");
+
+test(function() {
+  var tag = "q";
+  var c = document.getElementsByTagName(tag);
+  var element = append(this, tag);
+  assert_equals(c[0], element);
+  c[0] = "foo";
+  assert_equals(c[0], element);
+}, "Setting array index while indexed property exists (loose)");
+
+test(function() {
+  "use strict";
+  var tag = "s";
+  var c = document.getElementsByTagName(tag);
+  var element = append(this, tag);
+  assert_equals(c[0], element);
+  assert_throws(new TypeError(), function() {
+    c[0] = "foo";
+  });
+  assert_equals(c[0], element);
+}, "Setting array index while indexed property exists (strict)");
+
+test(function() {
+  var tag = "u";
+  var c = document.getElementsByTagName(tag);
+  assert_equals(c[0], undefined);
+  c[0] = "foo";
+  assert_equals(c[0], undefined);
+
+  var element = append(this, tag);
+  assert_equals(c[0], element);
+}, "Setting array index while indexed property doesn't exist (loose)");
+
+test(function() {
+  "use strict";
+  var tag = "u";
+  var c = document.getElementsByTagName(tag);
+  assert_equals(c[0], undefined);
+  assert_throws(new TypeError(), function() {
+    c[0] = "foo";
+  });
+  assert_equals(c[0], undefined);
+
+  var element = append(this, tag);
+  assert_equals(c[0], element);
+}, "Setting array index while indexed property doesn't exist (strict)");
+</script>
diff --git a/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html b/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html
new file mode 100644
index 00000000000..0a3a66bdf43
--- /dev/null
+++ b/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html
@@ -0,0 +1,417 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Element Reflection for aria-activedescendant and aria-errormessage</title>
+    <link rel=help href="https://wicg.github.io/aom/spec/aria-reflection.html">
+    <link rel="author" title="Meredith Lane" href="meredithl@chromium.org">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+<div id="role" role="button"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("role");
+    assert_equals(element.role, "button");
+    element.role = "checkbox";
+    assert_equals(element.getAttribute("role"), "checkbox");
+}, "role attribute reflects.");
+</script>
+
+<div id="atomic" aria-atomic="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("atomic");
+    assert_equals(element.ariaAtomic, "true");
+    element.ariaAtomic = "false";
+    assert_equals(element.getAttribute("aria-atomic"), "false");
+}, "aria-atomic attribute reflects.");
+</script>
+
+<div id="autocomplete" aria-autocomplete="list"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("autocomplete");
+    assert_equals(element.ariaAutoComplete, "list");
+    element.ariaAutoComplete = "inline";
+    assert_equals(element.getAttribute("aria-autocomplete"), "inline");
+}, "aria-autocomplete attribute reflects.");
+</script>
+
+<div id="busy" aria-busy="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("busy");
+    assert_equals(element.ariaBusy, "true");
+    element.ariaBusy = "false";
+    assert_equals(element.getAttribute("aria-busy"), "false");
+}, "aria-busy attribute reflects.");
+</script>
+
+<div id="checked" aria-checked="mixed"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("checked");
+    assert_equals(element.ariaChecked, "mixed");
+    element.ariaChecked = "true";
+    assert_equals(element.getAttribute("aria-checked"), "true");
+}, "aria-checked attribute reflects.");
+</script>
+
+<div id="colcount" aria-colcount="5"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("colcount");
+    assert_equals(element.ariaColCount, "5");
+    element.ariaColCount = "6";
+    assert_equals(element.getAttribute("aria-colcount"), "6");
+}, "aria-colcount attribute reflects.");
+</script>
+
+<div id="colindex" aria-colindex="1"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("colindex");
+    assert_equals(element.ariaColIndex, "1");
+    element.ariaColIndex = "2";
+    assert_equals(element.getAttribute("aria-colindex"), "2");
+}, "aria-colindex attribute reflects.");
+</script>
+
+<div id="colspan" aria-colspan="2"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("colspan");
+    assert_equals(element.ariaColSpan, "2");
+    element.ariaColSpan = "3";
+    assert_equals(element.getAttribute("aria-colspan"), "3");
+}, "aria-colspan attribute reflects.");
+</script>
+
+<div id="current" aria-current="page"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("current");
+    assert_equals(element.ariaCurrent, "page");
+    element.ariaCurrent = "step";
+    assert_equals(element.getAttribute("aria-current"), "step");
+}, "aria-current attribute reflects.");
+</script>
+
+<div id="disabled" aria-disabled="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("disabled");
+    assert_equals(element.ariaDisabled, "true");
+    element.ariaDisabled = "false";
+    assert_equals(element.getAttribute("aria-disabled"), "false");
+}, "aria-disabled attribute reflects.");
+</script>
+
+<div id="expanded" aria-expanded="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("expanded");
+    assert_equals(element.ariaExpanded, "true");
+    element.ariaExpanded = "false";
+    assert_equals(element.getAttribute("aria-expanded"), "false");
+}, "aria-expanded attribute reflects.");
+</script>
+
+<div id="haspopup" aria-haspopup="menu"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("haspopup");
+    assert_equals(element.ariaHasPopup, "menu");
+    element.ariaHasPopup = "listbox";
+    assert_equals(element.getAttribute("aria-haspopup"), "listbox");
+}, "aria-haspopup attribute reflects.");
+</script>
+
+<div id="hidden" aria-hidden="true" tabindex="-1"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("hidden");
+    assert_equals(element.ariaHidden, "true");
+    element.ariaHidden = "false";
+    assert_equals(element.getAttribute("aria-hidden"), "false");
+}, "aria-hidden attribute reflects.");
+</script>
+
+<div id="keyshortcuts" aria-keyshortcuts="x"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("keyshortcuts");
+    assert_equals(element.ariaKeyShortcuts, "x");
+    element.ariaKeyShortcuts = "y";
+    assert_equals(element.getAttribute("aria-keyshortcuts"), "y");
+}, "aria-keyshortcuts attribute reflects.");
+</script>
+
+<div id="label" aria-label="x"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("label");
+    assert_equals(element.ariaLabel, "x");
+    element.ariaLabel = "y";
+    assert_equals(element.getAttribute("aria-label"), "y");
+}, "aria-label attribute reflects.");
+</script>
+
+<div id="level" aria-level="1"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("level");
+    assert_equals(element.ariaLevel, "1");
+    element.ariaLevel = "2";
+    assert_equals(element.getAttribute("aria-level"), "2");
+}, "aria-level attribute reflects.");
+</script>
+
+<div id="live" aria-live="polite"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("live");
+    assert_equals(element.ariaLive, "polite");
+    element.ariaLive = "assertive";
+    assert_equals(element.getAttribute("aria-live"), "assertive");
+}, "aria-live attribute reflects.");
+</script>
+
+<div id="modal" aria-modal="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("modal");
+    assert_equals(element.ariaModal, "true");
+    element.ariaModal = "false";
+    assert_equals(element.getAttribute("aria-modal"), "false");
+}, "aria-modal attribute reflects.");
+</script>
+
+<div id="multiline" aria-multiline="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("multiline");
+    assert_equals(element.ariaMultiLine, "true");
+    element.ariaMultiLine = "false";
+    assert_equals(element.getAttribute("aria-multiline"), "false");
+}, "aria-multiline attribute reflects.");
+</script>
+
+<div id="multiselectable" aria-multiselectable="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("multiselectable");
+    assert_equals(element.ariaMultiSelectable, "true");
+    element.ariaMultiSelectable = "false";
+    assert_equals(element.getAttribute("aria-multiselectable"), "false");
+}, "aria-multiselectable attribute reflects.");
+</script>
+
+<div id="orientation" aria-orientation="vertical"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("orientation");
+    assert_equals(element.ariaOrientation, "vertical");
+    element.ariaOrientation = "horizontal";
+    assert_equals(element.getAttribute("aria-orientation"), "horizontal");
+}, "aria-orientation attribute reflects.");
+</script>
+
+<div id="placeholder" aria-placeholder="x"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("placeholder");
+    assert_equals(element.ariaPlaceholder, "x");
+    element.ariaPlaceholder = "y";
+    assert_equals(element.getAttribute("aria-placeholder"), "y");
+}, "aria-placeholder attribute reflects.");
+</script>
+
+<div id="posinset" aria-posinset="10"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("posinset");
+    assert_equals(element.ariaPosInSet, "10");
+    element.ariaPosInSet = "11";
+    assert_equals(element.getAttribute("aria-posinset"), "11");
+}, "aria-posinset attribute reflects.");
+</script>
+
+<button id="pressed" aria-pressed="true"></button>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("pressed");
+    assert_equals(element.ariaPressed, "true");
+    element.ariaPressed = "false";
+    assert_equals(element.getAttribute("aria-pressed"), "false");
+}, "aria-pressed attribute reflects.");
+</script>
+
+<div id="readonly" aria-readonly="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("readonly");
+    assert_equals(element.ariaReadOnly, "true");
+    element.ariaReadOnly = "false";
+    assert_equals(element.getAttribute("aria-readonly"), "false");
+}, "aria-readonly attribute reflects.");
+</script>
+
+<div id="relevant" aria-relevant="text"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("relevant");
+    assert_equals(element.ariaRelevant, "text");
+    element.ariaRelevant = "removals";
+    assert_equals(element.getAttribute("aria-relevant"), "removals");
+}, "aria-relevant attribute reflects.");
+</script>
+
+<div id="required" aria-required="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("required");
+    assert_equals(element.ariaRequired, "true");
+    element.ariaRequired = "false";
+    assert_equals(element.getAttribute("aria-required"), "false");
+}, "aria-required attribute reflects.");
+</script>
+
+<div id="roledescription" aria-roledescription="x"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("roledescription");
+    assert_equals(element.ariaRoleDescription, "x");
+    element.ariaRoleDescription = "y";
+    assert_equals(element.getAttribute("aria-roledescription"), "y");
+}, "aria-roledescription attribute reflects.");
+</script>
+
+<div id="rowcount" aria-rowcount="10"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("rowcount");
+    assert_equals(element.ariaRowCount, "10");
+    element.ariaRowCount = "11";
+    assert_equals(element.getAttribute("aria-rowcount"), "11");
+}, "aria-rowcount attribute reflects.");
+</script>
+
+<div id="rowindex" aria-rowindex="1"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("rowindex");
+    assert_equals(element.ariaRowIndex, "1");
+    element.ariaRowIndex = "2";
+    assert_equals(element.getAttribute("aria-rowindex"), "2");
+}, "aria-rowindex attribute reflects.");
+</script>
+
+<div id="rowspan" aria-rowspan="2"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("rowspan");
+    assert_equals(element.ariaRowSpan, "2");
+    element.ariaRowSpan = "3";
+    assert_equals(element.getAttribute("aria-rowspan"), "3");
+}, "aria-rowspan attribute reflects.");
+</script>
+
+<div id="setsize" aria-setsize="10"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("setsize");
+    assert_equals(element.ariaSelected, "10");
+    element.ariaSelected = "11";
+    assert_equals(element.getAttribute("aria-setsize"), "11");
+}, "aria-setsize attribute reflects.");
+</script>
+
+<div id="sort" aria-sort="descending"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("sort");
+    assert_equals(element.ariaSort, "descending");
+    element.ariaSort = "ascending";
+    assert_equals(element.getAttribute("aria-sort"), "ascending");
+}, "aria-sort attribute reflects.");
+</script>
+
+<div id="valuemax" aria-valuemax="99"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("valuemax");
+    assert_equals(element.ariaValueMax, "99");
+    element.ariaValueMax = "100";
+    assert_equals(element.getAttribute("aria-valuemax"), "100");
+}, "aria-valuemax attribute reflects.");
+</script>
+
+<div id="valuemin" aria-valuemin="3"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("valuemin");
+    assert_equals(element.ariaValueMin, "3");
+    element.ariaValueMin = "2";
+    assert_equals(element.getAttribute("aria-valuemin"), "2");
+}, "aria-valuemin attribute reflects.");
+</script>
+
+<div id="valuenow" aria-valuenow="50"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("valuenow");
+    assert_equals(element.ariaValueNow, "50");
+    element.ariaValueNow = "51";
+    assert_equals(element.getAttribute("aria-valuenow"), "51");
+}, "aria-valuenow attribute reflects.");
+</script>
+
+<div id="valuetext" aria-valuetext="50%"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("valuetext");
+    assert_equals(element.ariaValueText, "50%");
+    element.ariaValueText = "51%";
+    assert_equals(element.getAttribute("aria-valuetext"), "51%");
+}, "aria-valuetext attribute reflects.");
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/element-timing/scroll-to-text.html b/tests/wpt/web-platform-tests/element-timing/scroll-to-text.html
index a86dd85ce9c..ed332740323 100644
--- a/tests/wpt/web-platform-tests/element-timing/scroll-to-text.html
+++ b/tests/wpt/web-platform-tests/element-timing/scroll-to-text.html
@@ -25,7 +25,7 @@
       // We scroll to the end of the document so that the paragraph becomes visible.
       // A user agent could paint the text before or after scrolling, but either way
       // it must produce an entry for it.
-      window.scrollTo(0,document.body.scrollHeight);
+      window.scrollTo(0,document.scrollingElement.scrollHeight);
     };
   }, 'Paragraph with elementtiming attribute is observed even when not initially visible.');
 </script>
diff --git a/tests/wpt/web-platform-tests/fetch/api/request/request-init-stream.any.js b/tests/wpt/web-platform-tests/fetch/api/request/request-init-stream.any.js
index 22e3f41bc2d..df5fb26a0d8 100644
--- a/tests/wpt/web-platform-tests/fetch/api/request/request-init-stream.any.js
+++ b/tests/wpt/web-platform-tests/fetch/api/request/request-init-stream.any.js
@@ -2,50 +2,50 @@
 
 "use strict";
 
-async function assert_request(input, init) {
+async function assert_request(test, input, init) {
   assert_throws(new TypeError(), () => new Request(input, init), "new Request()");
-  assert_throws(new TypeError(), async () => await fetch(input, init), "fetch()");
+  await promise_rejects_js(test, TypeError, fetch(input, init), "fetch()");
 }
 
-promise_test(async () => {
+promise_test(async (t) => {
   const stream = new ReadableStream();
   stream.getReader();
-  await assert_request("...", { method:"POST", body: stream });
+  await assert_request(t, "...", { method:"POST", body: stream });
 }, "Constructing a Request with a stream on which getReader() is called");
 
-promise_test(async () => {
+promise_test(async (t) => {
   const stream = new ReadableStream();
   stream.getReader().read();
-  await assert_request("...", { method:"POST", body: stream });
+  await assert_request(t, "...", { method:"POST", body: stream });
 }, "Constructing a Request with a stream on which read() is called");
 
-promise_test(async () => {
+promise_test(async (t) => {
   const stream = new ReadableStream({ pull: c => c.enqueue(new Uint8Array()) }),
         reader = stream.getReader();
   await reader.read();
   reader.releaseLock();
-  await assert_request("...", { method:"POST", body: stream });
+  await assert_request(t, "...", { method:"POST", body: stream });
 }, "Constructing a Request with a stream on which read() and releaseLock() are called");
 
-promise_test(async () => {
+promise_test(async (t) => {
   const request = new Request("...", { method: "POST", body: "..." });
   request.body.getReader();
-  await assert_request(request);
+  await assert_request(t, request);
   assert_class_string(new Request(request, { body: "..." }), "Request");
 }, "Constructing a Request with a Request on which body.getReader() is called");
 
-promise_test(async () => {
+promise_test(async (t) => {
   const request = new Request("...", { method: "POST", body: "..." });
   request.body.getReader().read();
-  await assert_request(request);
+  await assert_request(t, request);
   assert_class_string(new Request(request, { body: "..." }), "Request");
 }, "Constructing a Request with a Request on which body.getReader().read() is called");
 
-promise_test(async () => {
+promise_test(async (t) => {
   const request = new Request("...", { method: "POST", body: "..." }),
         reader = request.body.getReader();
   await reader.read();
   reader.releaseLock();
-  await assert_request(request);
+  await assert_request(t, request);
   assert_class_string(new Request(request, { body: "..." }), "Request");
 }, "Constructing a Request with a Request on which read() and releaseLock() are called");
diff --git a/tests/wpt/web-platform-tests/fetch/api/response/response-static-error.html b/tests/wpt/web-platform-tests/fetch/api/response/response-static-error.html
index 6e927a8bf62..b2d6e82d427 100644
--- a/tests/wpt/web-platform-tests/fetch/api/response/response-static-error.html
+++ b/tests/wpt/web-platform-tests/fetch/api/response/response-static-error.html
@@ -20,6 +20,16 @@
 
         assert_true(responseError.headers.entries().next().done, "Headers should be empty");
       }, "Check response returned by static method error()");
+
+      test(function() {
+        const headers = Response.error().headers;
+
+        // Avoid false positives if expected API is not available
+        assert_true(!!headers);
+        assert_equals(typeof headers.append, 'function');
+
+        assert_throws_js(TypeError, function () { headers.append('name', 'value'); });
+      }, "the 'guard' of the Headers instance should be immutable");
     </script>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html b/tests/wpt/web-platform-tests/fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html
index 66d9c431613..08c420ec024 100644
--- a/tests/wpt/web-platform-tests/fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html
+++ b/tests/wpt/web-platform-tests/fullscreen/api/element-ready-check-containing-iframe-manual.tentative.html
@@ -21,8 +21,8 @@ window.onload = function() {
       iframes[0].contentDocument.onfullscreenchange = t.step_func(function() {
           assert_equals(document.fullscreenElement, iframes[0]);
           trusted_request(t, iframes[1].contentDocument.body, iframes[0].contentDocument.body);
-          iframes[1].contentDocument.onfullscreenchange = t.unreached_func("fullscreenchange event");
-          iframes[1].contentDocument.onfullscreenerror = t.step_func_done();
+          iframes[1].contentDocument.onfullscreenerror = t.unreached_func("fullscreenerror event");
+          iframes[1].contentDocument.onfullscreenchange = t.step_func_done();
       });
   });
 };
diff --git a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-function-parent.html b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-function-parent.html
index bd2d9dfdb1e..2efc3a6b4a6 100644
--- a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-function-parent.html
+++ b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-function-parent.html
@@ -6,6 +6,7 @@
 <div id=log></div>
 <iframe></iframe>
 <script>
+  setup({ single_test: true });
   onload = function() {
     var fr = document.querySelector("iframe")
     fr.contentWindow.location = "support/dummy.html"
diff --git a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-src-about-blank.html b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-src-about-blank.html
index dce6ab2f693..0f8a633f1df 100644
--- a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-src-about-blank.html
+++ b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/navigating-across-documents/source/navigate-child-src-about-blank.html
@@ -6,6 +6,7 @@
 <div id=log></div>
 <iframe></iframe>
 <script>
+  setup({ single_test: true });
   onload = function() {
     var fr = document.querySelector("iframe")
     fr.src = "about:blank"
diff --git a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-frag-percent-encoded.html b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-frag-percent-encoded.html
index e8a1e9fd767..aa179425c5b 100644
--- a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-frag-percent-encoded.html
+++ b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-frag-percent-encoded.html
@@ -15,31 +15,27 @@
 var steps = [{
     fragid:'has%20two%20spaces',
       handler: function(){
-        assert_equals( scrollPosition(), 100 );
+        assert_equals( document.scrollingElement.scrollTop, 100 );
       }
     },{
       fragid:'escape%20collision',
       handler: function(){
-        assert_equals( scrollPosition(), 200 );
+        assert_equals( document.scrollingElement.scrollTop, 200 );
         document.getElementById("%20has%20two%20spaces").setAttribute("id", "has%20two%20spaces");
       }
     },{
       fragid:'has%20two%20spaces',
       handler: function(){
-        assert_equals( scrollPosition(), 300 );
+        assert_equals( document.scrollingElement.scrollTop, 300 );
       }
     },{
       fragid:'do%20not%20go%20here',
       handler: function(){
         // don't move
-        assert_equals( scrollPosition(), 400 );
+        assert_equals( document.scrollingElement.scrollTop, 400 );
       }
     }];
 
-function scrollPosition(){
-  return document.documentElement.scrollTop || document.body.scrollTop;
-}
-
 function runNextStep(){
     if( steps.length > 0 ) {
       var step = steps.shift();
diff --git a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html
index 3265a71bf7c..bf62e4cd55c 100644
--- a/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html
+++ b/tests/wpt/web-platform-tests/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-top.html
@@ -11,29 +11,25 @@
 var steps = [{
     fragid:'not-the-top',
     handler: function(){
-      assert_not_equals( scrollPosition(), 0 );
+      assert_not_equals( document.scrollingElement.scrollTop, 0 );
     }
   },{
     fragid:'top',
     handler: function(){
-      assert_equals( scrollPosition(), 0 );
+      assert_equals( document.scrollingElement.scrollTop, 0 );
     }
   },{
     fragid:'not-the-top',
     handler: function(){
-      assert_not_equals( scrollPosition(), 0 );
+      assert_not_equals( document.scrollingElement.scrollTop, 0 );
     }
   },{
     fragid:'TOP',
     handler: function(){
-      assert_equals( scrollPosition(), 0 );
+      assert_equals( document.scrollingElement.scrollTop, 0 );
     }
   }];
 
-function scrollPosition(){
-  return document.documentElement.scrollTop || document.body.scrollTop;
-}
-
 function runNextStep(){
     if( steps.length > 0 ) {
       var step = steps.shift();
diff --git a/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context-iframe.html b/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context-iframe.html
new file mode 100644
index 00000000000..dc15d57c6a3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context-iframe.html
@@ -0,0 +1,5 @@
+<body>
+  <script>
+    document.__proto__.changeFromSandboxedIframe = "change from sandboxed iframe";
+  </script>
+</body>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context.html b/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context.html
new file mode 100644
index 00000000000..6692257bc41
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/sandboxing/sandbox-new-execution-context.html
@@ -0,0 +1,40 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Reuse of iframe about:blank document execution context</title>
+    <link rel="author" title="Dan Clark" href="mailto:daniec@microsoft.com">
+    <link rel="help" href="http://www.w3.org/html/wg/drafts/html/master/browsers.html#sandboxing">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+
+  <body>
+    <h1>Reuse of iframe about:blank document execution context in sandbox="allow-scripts" iframe</h1>
+    <script type="text/javascript">
+      var t = async_test("iframe with sandbox should load with new execution context")
+
+      let iframe = document.createElement("iframe");
+      iframe.src = './sandbox-new-execution-context-iframe.html';
+      document.body.appendChild(iframe);
+      iframe.sandbox = "allow-scripts";
+
+      let iframeAboutBlankDocument = iframe.contentDocument;
+      assert_equals(iframeAboutBlankDocument.URL, "about:blank");
+
+      iframe.onload = t.step_func_done(() => {
+        assert_equals(iframe.contentDocument, null,
+          "New document in sandboxed iframe should have opaque origin");
+
+        assert_equals(iframeAboutBlankDocument.__proto__.changeFromSandboxedIframe, undefined,
+          "Sandboxed iframe contents should not have been able to mess with type system of about:blank document");
+
+        let iframeAboutBlankContents = iframeAboutBlankDocument.querySelectorAll('body');
+        assert_equals(iframeAboutBlankContents[0].tagName, "BODY",
+          "about:blank document's contents should still be accessible");
+
+        t.done();
+      });
+    </script>
+    <div id="log"></div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/html/interaction/focus/sequential-focus-navigation-and-the-tabindex-attribute/tabindex-getter.html b/tests/wpt/web-platform-tests/html/interaction/focus/sequential-focus-navigation-and-the-tabindex-attribute/tabindex-getter.html
index 773739804b3..785e8c91ffa 100644
--- a/tests/wpt/web-platform-tests/html/interaction/focus/sequential-focus-navigation-and-the-tabindex-attribute/tabindex-getter.html
+++ b/tests/wpt/web-platform-tests/html/interaction/focus/sequential-focus-navigation-and-the-tabindex-attribute/tabindex-getter.html
@@ -4,6 +4,17 @@
 <link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#dom-tabindex">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<style>
+#scrollable {
+  width: 100px;
+  height: 100px;
+  overflow: scroll;
+}
+#scrollable-inner {
+  width: 1024px;
+  height: 2048px;
+}
+</style>
 <body>
 <input>
 <input type="hidden">
@@ -26,6 +37,11 @@
 <details><summary>summary</summary><summary id="secondsummary">second summary</summary>details</details>
 <div id="hostDelegatesFocus"></div>
 <div id="hostNonDelegatesFocus"></div>
+<div contenteditable="true"></div>
+<div id="scrollable"><div id="scrollable-inner"></div></div>
+<fieldset></fieldset>
+<output></output>
+<slot></slot>
 <script>
 document.getElementById("hostDelegatesFocus").attachShadow({ mode: "open", delegatesFocus: true });
 document.getElementById("hostNonDelegatesFocus").attachShadow({ mode: "open", delegatesFocus: false });
@@ -55,6 +71,11 @@ const defaultList = [
   ["summary#secondsummary", -1],
   ["#hostDelegatesFocus", -1],
   ["#hostNonDelegatesFocus", -1],
+  ["div[contenteditable]", -1],
+  ["#scrollable", -1],
+  ["fieldset", -1],
+  ["output", -1],
+  ["slot", -1],
 ];
 const tabIndexValue = [-1, 0, 1];
 for (const entry of defaultList) {
diff --git a/tests/wpt/web-platform-tests/html/interaction/focus/the-autofocus-attribute/not-on-first-task.html b/tests/wpt/web-platform-tests/html/interaction/focus/the-autofocus-attribute/not-on-first-task.html
index 50efc176935..ab27342f4fe 100644
--- a/tests/wpt/web-platform-tests/html/interaction/focus/the-autofocus-attribute/not-on-first-task.html
+++ b/tests/wpt/web-platform-tests/html/interaction/focus/the-autofocus-attribute/not-on-first-task.html
@@ -13,10 +13,10 @@
 <script>
 "use strict";
 
-const input = document.querySelector("input");
+test(() => {
+  const input = document.querySelector("input");
 
-assert_equals(document.activeElement, document.body);
-assert_not_equals(document.activeElement, input);
-
-done();
+  assert_equals(document.activeElement, document.body);
+  assert_not_equals(document.activeElement, input);
+});
 </script>
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/flow-content-0/dialog-display.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/flow-content-0/dialog-display.html
index 19f8d54df82..48b0e33d944 100644
--- a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/flow-content-0/dialog-display.html
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/flow-content-0/dialog-display.html
@@ -7,6 +7,7 @@
 </style>
 <dialog open id=dialog></dialog>
 <script>
-assert_equals(getComputedStyle(document.getElementById('dialog')).display, 'block');
-done();
+test(function() {
+  assert_equals(getComputedStyle(document.getElementById('dialog')).display, 'block');
+});
 </script>
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/margin-collapsing-quirks/compare-computed-style.js b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/margin-collapsing-quirks/compare-computed-style.js
index b25993fb730..496bae3a101 100644
--- a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/margin-collapsing-quirks/compare-computed-style.js
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/margin-collapsing-quirks/compare-computed-style.js
@@ -1,6 +1,7 @@
-var testStyle = getComputedStyle(document.getElementById('test'));
-var refStyle = getComputedStyle(document.getElementById('ref'));
-for (var prop in testStyle) {
-  assert_equals(testStyle[prop], refStyle[prop], prop);
-}
-done();
+test(function() {
+  var testStyle = getComputedStyle(document.getElementById('test'));
+  var refStyle = getComputedStyle(document.getElementById('ref'));
+  for (var prop in testStyle) {
+    assert_equals(testStyle[prop], refStyle[prop], prop);
+  }
+});
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace-s.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace-s.html
index dae70b394a5..9f462b57686 100644
--- a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace-s.html
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace-s.html
@@ -7,9 +7,10 @@
 <table vspace=25 hspace=25><tr><td>x</table>
 <div>x</div>
 <script>
-var style = getComputedStyle(document.querySelector('table'));
-['marginTop', 'marginRight', 'marginBottom', 'marginLeft'].forEach(function(m) {
-  assert_equals(style[m], '0px', m);
+test(function() {
+  var style = getComputedStyle(document.querySelector('table'));
+  ['marginTop', 'marginRight', 'marginBottom', 'marginLeft'].forEach(function(m) {
+    assert_equals(style[m], '0px', m);
+  });
 });
-done();
 </script>
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace.html
index 9a951954e28..c081775b873 100644
--- a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace.html
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-vspace-hspace.html
@@ -7,9 +7,10 @@
 <table vspace=25 hspace=25><tr><td>x</table>
 <div>x</div> <!-- prevent margin collapsing quirks -->
 <script>
-var style = getComputedStyle(document.querySelector('table'));
-['marginTop', 'marginRight', 'marginBottom', 'marginLeft'].forEach(function(m) {
-  assert_equals(style[m], '0px', m);
+test(function() {
+  var style = getComputedStyle(document.querySelector('table'));
+  ['marginTop', 'marginRight', 'marginBottom', 'marginLeft'].forEach(function(m) {
+    assert_equals(style[m], '0px', m);
+  });
 });
-done();
 </script>
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html
index b5b49d1b867..b09cafbbe42 100644
--- a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/the-page/iframe-marginwidth-marginheight.html
@@ -4,6 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <iframe src="/common/blank.html" marginwidth=0 marginheight=0></iframe>
 <script>
+setup({ single_test: true });
 onload = () => {
   assert_equals(window[0].document.body.attributes.length, 0, "Number of attributes on the child document's body");
   done();
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html
index 09454a13b20..3bf8cfb6cc8 100644
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html
@@ -9,6 +9,7 @@
 
 <script>
 "use strict";
+setup({ single_test: true });
 
 const sourceIFrame = document.createElement("iframe");
 sourceIFrame.setAttribute("sandbox", "allow-same-origin");
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html
index f5c4e991829..cc7eb5e5e02 100644
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html
@@ -9,6 +9,7 @@
 
 <script>
 "use strict";
+setup({ single_test: true });
 
 const sourceIFrame = document.createElement("iframe");
 
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/dynamic-append.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/dynamic-append.html
index e0896269f30..4d2fa789403 100644
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/dynamic-append.html
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/dynamic-append.html
@@ -9,6 +9,7 @@
 
 <script>
 "use strict";
+setup({ single_test: true });
 
 const iframe = document.createElement("iframe");
 let loadCount = 0;
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/not-in-shadow-tree.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/not-in-shadow-tree.html
index ec979732e6f..2a9f301fffb 100644
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/not-in-shadow-tree.html
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/not-in-shadow-tree.html
@@ -9,6 +9,7 @@
 <div id="log"></div>
 <script>
 "use strict";
+setup({ single_test: true });
 
 const iframe = document.createElement("iframe");
 iframe.src = "support/ufoo";
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/remove-from-document.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/remove-from-document.html
index 66a067fcd84..1e608a3456b 100644
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/remove-from-document.html
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/remove-from-document.html
@@ -9,6 +9,7 @@
 
 <script>
 "use strict";
+setup({ single_test: true });
 
 const sourceIFrame = document.createElement("iframe");
 let sourceLoadCount = 0;
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html
index cf1b98c2bce..930d9cbd5b7 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html
@@ -5,6 +5,7 @@
 <script src="/common/media.js"></script>
 <div id="log"></div>
 <script>
+setup({ single_test: true });
 // https://html.spec.whatwg.org/#ready-states says:
 //
 // HAVE_FUTURE_DATA: "the text tracks are ready".
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_01.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_01.html
index efd563f51ac..900d8cd0226 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_01.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_01.html
@@ -6,6 +6,7 @@
 <iframe src="about:blank"></iframe>
 <div id="target"></div>
 <script>
+setup({ single_test: true });
 onload = function() {
   var ifr = document.getElementsByTagName('iframe')[0];
   ifr.contentDocument.body.appendChild(ifr.contentDocument.createElement('p')).textContent = 'Modified document';
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_02.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_02.html
index dbe266b2930..d82dafe3cec 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_02.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_02.html
@@ -6,6 +6,7 @@
 <iframe src="about:blank"></iframe>
 <div id="target"></div>
 <script>
+setup({ single_test: true });
 onload = function() {
   var ifr = document.getElementsByTagName('iframe')[0];
   ifr.contentDocument.open();
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_03.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_03.html
index c07dd42dc81..5db77ad8902 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_03.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_03.html
@@ -6,6 +6,7 @@
 <iframe src="support/blank.htm"></iframe>
 <div id="target"></div>
 <script>
+setup({ single_test: true });
 onload = function() {
   var ifr = document.getElementsByTagName('iframe')[0];
   ifr.contentDocument.body.appendChild(ifr.contentDocument.createElement('p')).textContent = 'Modified document';
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_04.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_04.html
index 755cd45d34b..bd076948abe 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_04.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/move_iframe_in_dom_04.html
@@ -6,6 +6,7 @@
 <iframe src="support/blank.htm"></iframe>
 <div id="target"></div>
 <script>
+setup({ single_test: true });
 onload = function(){
   var ifr = document.getElementsByTagName('iframe')[0];
   ifr.contentDocument.open();
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/srcdoc_change_hash.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/srcdoc_change_hash.html
index 457a07f9e2f..fe72333d1a6 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/srcdoc_change_hash.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-iframe-element/srcdoc_change_hash.html
@@ -1,12 +1,10 @@
-<!--
-  Test same-document navigation inside an srcdoc iframe using location.hash
--->
+<title>same-document navigation inside an srcdoc iframe using location.hash</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <script>
-  async function test() {
+  promise_test(async () => {
     // Wait until 'document' is available.
     await new Promise(resolve => window.addEventListener('load', resolve));
 
@@ -66,8 +64,5 @@
       await hash_changed;
       assert_equals(iframe.contentWindow.location.href, "about:srcdoc#2");
     }
-
-    done();
-  }
-  test();
+  });
 </script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/data-url.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/data-url.html
index 2fa63004390..808b5c884c5 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/data-url.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/data-url.html
@@ -5,6 +5,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <div id=log></div>
 <script>
+setup({ single_test: true });
+
 var c = document.createElement("canvas"),
     con = c.getContext("2d"),
     img = document.createElement("img")
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html
index a8038e56057..52366dcaa7f 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html
@@ -3,7 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
-setup({explicit_done:true});
+setup({single_test:true});
 const image_was_loaded = () => {
   const iframe = document.getElementById("iframe");
   // Resize the iframe
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/update-src-complete.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/update-src-complete.html
index 267c0082983..de3926a2964 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/update-src-complete.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/update-src-complete.html
@@ -5,6 +5,8 @@
 <script src="/resources/testharnessreport.js"></script>
 <p id="display"><img src="image.png"></p>
 <script>
+    setup({ single_test: true });
+
     function check() {
         var img = document.querySelector("img");
         assert_true(img.complete, "By onload, image should have loaded");
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/historical-search-event.html b/tests/wpt/web-platform-tests/html/semantics/forms/historical-search-event.html
new file mode 100644
index 00000000000..b7a089a68e4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/historical-search-event.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>search event should not be supported</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<input id=input type=search incremental>
+<script>
+promise_test(async t => {
+  const input = document.getElementById('input');
+  const eventWatcher = new EventWatcher(t, input, ['search', 'keypress']);
+  await Promise.all([
+    test_driver.send_keys(input, 'x'),
+    eventWatcher.wait_for(['keypress'])
+  ]);
+  // During this timeout, the search event will fire, if it's supported,
+  // which fails the test since the event watcher isn't expecting it.
+  await new Promise(resolve => t.step_timeout(resolve, 1000));
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/historical.html b/tests/wpt/web-platform-tests/html/semantics/forms/historical.html
index 6873ecd2517..277e1241610 100644
--- a/tests/wpt/web-platform-tests/html/semantics/forms/historical.html
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/historical.html
@@ -73,6 +73,18 @@ t('form', 'meter');
 t('item', 'form');
 t('namedItem', 'form');
 
+// Never specified but implemented in WebKit/Chromium
+test(() => {
+  assert_false("onsearch" in window);
+}, "window.onsearch should not be supported");
+
+test(() => {
+  assert_false("onsearch" in document);
+}, "document.onsearch should not be supported");
+
+t('onsearch', 'input');
+t('incremental', 'input');
+
 // <input name=isindex>
 // removed in https://github.com/whatwg/html/commit/5c44abc734eb483f9a7ec79da5844d2fe63d9c3b
 async_test(function() {
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/checkbox-detached-change-event.html b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/checkbox-detached-change-event.html
new file mode 100644
index 00000000000..43420790fdb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/checkbox-detached-change-event.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+async_test(t => {
+  const input = document.createElement('input');
+  input.type = 'checkbox';
+  input.addEventListener('change', t.step_func_done(() => {}));
+  input.dispatchEvent(new MouseEvent('click'));
+}, 'This test will pass if <input type=checkbox> emits change events while detached from document.body');
+</script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/radio-detached-change-event.html b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/radio-detached-change-event.html
new file mode 100644
index 00000000000..d1b18014981
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/radio-detached-change-event.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+async_test(t => {
+  const input = document.createElement('input');
+  input.type = 'radio';
+  input.addEventListener('change', t.step_func_done(() => {}));
+  input.dispatchEvent(new MouseEvent('click'));
+}, 'This test will pass if <input type=radio> emits change events while detached from document.body');
+</script>
diff --git a/tests/wpt/web-platform-tests/html/user-activation/activation-api-iframe-no-activate.tenative.html b/tests/wpt/web-platform-tests/html/user-activation/activation-api-iframe-no-activate.tenative.html
index 8c7610e28b0..bd34518ba88 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/activation-api-iframe-no-activate.tenative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/activation-api-iframe-no-activate.tenative.html
@@ -32,9 +32,9 @@
           // click in parent document
           test_driver.click(document.getElementById('instructions'));
         } else if (msg.type == 'child-one-report') {
-          // state should be false after asked to report
+          // only the transient state should be false after asked to report
           assert_false(msg.isActive);
-          assert_false(msg.hasBeenActive);
+          assert_true(msg.hasBeenActive);
           t.done();
         }
       }));
diff --git a/tests/wpt/web-platform-tests/html/webappapis/timers/negative-setinterval.html b/tests/wpt/web-platform-tests/html/webappapis/timers/negative-setinterval.html
index 430d13c58aa..663872cd1f3 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/timers/negative-setinterval.html
+++ b/tests/wpt/web-platform-tests/html/webappapis/timers/negative-setinterval.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
+setup({ single_test: true });
 var i = 0;
 var interval;
 function next() {
diff --git a/tests/wpt/web-platform-tests/html/webappapis/timers/negative-settimeout.html b/tests/wpt/web-platform-tests/html/webappapis/timers/negative-settimeout.html
index 57e88ee701d..b59fc8f2298 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/timers/negative-settimeout.html
+++ b/tests/wpt/web-platform-tests/html/webappapis/timers/negative-settimeout.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
+ setup({ single_test: true });
  setTimeout(done, -100);
  setTimeout(assert_unreached, 10);
 </script>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-setinterval.html b/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-setinterval.html
index af029959984..7fb81ff29ac 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-setinterval.html
+++ b/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-setinterval.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
+setup({ single_test: true });
 var interval;
 function next() {
   clearInterval(interval);
diff --git a/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-settimeout.html b/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-settimeout.html
index 31fa4f12642..4dc7d17ea5f 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-settimeout.html
+++ b/tests/wpt/web-platform-tests/html/webappapis/timers/type-long-settimeout.html
@@ -3,6 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
+setup({ single_test: true });
 setTimeout(done, Math.pow(2, 32));
 setTimeout(assert_unreached, 100);
 </script>
diff --git a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
index b13d047c551..d2ec623e864 100644
--- a/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
+++ b/tests/wpt/web-platform-tests/interfaces/web-nfc.idl
@@ -18,7 +18,7 @@ interface NDEFRecord {
   constructor(NDEFRecordInit recordInit);
 
   readonly attribute USVString recordType;
-  readonly attribute USVString mediaType;
+  readonly attribute USVString? mediaType;
   readonly attribute USVString id;
   readonly attribute DataView? data;
 
diff --git a/tests/wpt/web-platform-tests/interfaces/webxr.idl b/tests/wpt/web-platform-tests/interfaces/webxr.idl
index 262fa2423af..1dab90eff49 100644
--- a/tests/wpt/web-platform-tests/interfaces/webxr.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webxr.idl
@@ -50,10 +50,13 @@ enum XRVisibilityState {
 
   // Events
   attribute EventHandler onend;
-  attribute EventHandler onselect;
   attribute EventHandler oninputsourceschange;
+  attribute EventHandler onselect;
   attribute EventHandler onselectstart;
   attribute EventHandler onselectend;
+  attribute EventHandler onsqueeze;
+  attribute EventHandler onsqueezestart;
+  attribute EventHandler onsqueezeend;
   attribute EventHandler onvisibilitychange;
 };
 
diff --git a/tests/wpt/web-platform-tests/mixed-content/spec.src.json b/tests/wpt/web-platform-tests/mixed-content/spec.src.json
index e4844a8016b..c272bb3f642 100644
--- a/tests/wpt/web-platform-tests/mixed-content/spec.src.json
+++ b/tests/wpt/web-platform-tests/mixed-content/spec.src.json
@@ -240,6 +240,9 @@
         "http-rp",
         "meta"
       ],
+      "iframe-blank": [
+        "meta"
+      ],
       "srcdoc": [
         "meta"
       ],
@@ -255,6 +258,7 @@
     "supported_subresource": {
       "top": "*",
       "iframe": "*",
+      "iframe-blank": "*",
       "srcdoc": "*",
       "worker-classic": [
         "xhr",
diff --git a/tests/wpt/web-platform-tests/mixed-content/spec_json.js b/tests/wpt/web-platform-tests/mixed-content/spec_json.js
index 009a853077b..00428b1fa5e 100644
--- a/tests/wpt/web-platform-tests/mixed-content/spec_json.js
+++ b/tests/wpt/web-platform-tests/mixed-content/spec_json.js
@@ -1 +1 @@
-var SPEC_JSON = {"subresource_schema": {"supported_delivery_type": {"picture-tag": [], "worklet-layout": [], "worklet-paint": [], "img-tag": [], "a-tag": [], "worklet-layout-import-data": [], "worklet-audio-import-data": [], "worklet-animation": [], "websocket": [], "worklet-paint-import-data": [], "video-tag": [], "object-tag": [], "worklet-audio": [], "beacon": [], "worker-module": [], "worker-import-data": [], "script-tag": [], "worklet-animation-import-data": [], "link-css-tag": [], "xhr": [], "worker-classic": [], "link-prefetch-tag": [], "audio-tag": [], "fetch": []}}, "excluded_tests": [{"delivery_value": null, "origin": "*", "delivery_type": "http-rp", "name": "Skip-redundant-no-opt-in", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": "*", "optionally-blockable": "*"}}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "Redundant-subresources", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": ["a-tag"], "optionally-blockable": []}}, {"delivery_value": "*", "origin": ["same-https", "same-http", "cross-https", "cross-http"], "delivery_type": "*", "name": "Skip-origins-not-applicable-to-websockets", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": ["websocket"], "optionally-blockable": []}}, {"delivery_value": "opt-in", "origin": "*", "delivery_type": "meta", "name": "Skip-redundant-for-opt-in-method", "expectation": "*", "expansion": "*", "redirection": ["keep-scheme", "swap-scheme"], "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": "*", "optionally-blockable": "*"}}], "specification": [{"test_expansion": [{"delivery_value": "opt-in", "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": [], "optionally-blockable": "*"}}, {"delivery_value": null, "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "no-opt-in-allows", "expectation": "allowed", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": [], "optionally-blockable": "*"}}], "description": "Test behavior of optionally-blockable content", "specification_url": "http://www.w3.org/TR/mixed-content/#category-optionally-blockable", "name": "optionally-blockable", "title": "Optionally-blockable content"}, {"test_expansion": [{"delivery_value": "opt-in", "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": []}}, {"delivery_value": null, "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "no-opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": []}}, {"delivery_value": "*", "origin": ["cross-ws", "same-ws"], "delivery_type": "*", "name": "ws-downgrade-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "websocket", "optionally-blockable": []}}], "description": "Test behavior of blockable content.", "specification_url": "http://www.w3.org/TR/mixed-content/#category-blockable", "name": "blockable", "title": "Blockable content"}, {"test_expansion": [{"delivery_value": "*", "origin": ["same-https"], "delivery_type": "*", "name": "allowed", "expectation": "allowed", "expansion": "default", "redirection": ["no-redirect", "keep-scheme"], "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": "*"}}, {"delivery_value": "*", "origin": ["same-wss"], "delivery_type": "*", "name": "websocket-allowed", "expectation": "allowed", "expansion": "default", "redirection": ["no-redirect", "keep-scheme"], "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "websocket", "optionally-blockable": []}}], "description": "Test behavior of allowed content.", "specification_url": "http://www.w3.org/TR/mixed-content/", "name": "allowed", "title": "Allowed content"}], "test_expansion_schema": {"delivery_value": [null, "opt-in"], "origin": ["same-https", "same-http", "cross-https", "cross-http", "same-wss", "same-ws", "cross-wss", "cross-ws"], "delivery_type": ["http-rp", "meta"], "subresource": {"blockable": ["script-tag", "link-css-tag", "xhr", "worker-classic", "worker-module", "worker-import-data", "worklet-animation", "worklet-audio", "worklet-layout", "worklet-paint", "worklet-animation-import-data", "worklet-audio-import-data", "worklet-layout-import-data", "worklet-paint-import-data", "fetch", "a-tag", "object-tag", "picture-tag", "websocket", "link-prefetch-tag", "beacon"], "optionally-blockable": ["img-tag", "audio-tag", "video-tag"]}, "expectation": ["allowed", "blocked"], "expansion": ["default", "override"], "redirection": ["no-redirect", "keep-scheme", "swap-scheme"], "source_context_list": ["top", "worker-classic-data", "worker-module-data"], "source_scheme": ["http", "https"]}, "source_context_list_schema": {"worker-classic-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "worker-classic-data", "policyDeliveries": []}]}, "top": {"subresourcePolicyDeliveries": [], "description": "Policy set by the top-level Document", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}]}, "worker-module-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "worker-module-data", "policyDeliveries": []}]}}, "delivery_key": "mixedContent", "source_context_schema": {"supported_delivery_type": {"iframe": ["http-rp", "meta"], "worker-module-data": [], "worker-classic-data": [], "top": ["http-rp", "meta"], "worker-classic": ["http-rp"], "worker-module": ["http-rp"], "srcdoc": ["meta"]}, "supported_subresource": {"iframe": "*", "worker-module-data": ["xhr", "fetch", "websocket"], "worker-classic-data": ["xhr", "fetch", "websocket"], "top": "*", "worker-classic": ["xhr", "fetch", "websocket"], "worker-module": ["xhr", "fetch", "websocket"], "srcdoc": "*"}}};
+var SPEC_JSON = {"subresource_schema": {"supported_delivery_type": {"picture-tag": [], "worklet-layout": [], "worklet-paint": [], "img-tag": [], "a-tag": [], "worklet-layout-import-data": [], "worklet-audio-import-data": [], "worklet-animation": [], "websocket": [], "worklet-paint-import-data": [], "video-tag": [], "object-tag": [], "worklet-audio": [], "beacon": [], "worker-module": [], "worker-import-data": [], "script-tag": [], "worklet-animation-import-data": [], "link-css-tag": [], "xhr": [], "worker-classic": [], "link-prefetch-tag": [], "audio-tag": [], "fetch": []}}, "excluded_tests": [{"delivery_value": null, "origin": "*", "delivery_type": "http-rp", "name": "Skip-redundant-no-opt-in", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": "*", "optionally-blockable": "*"}}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "Redundant-subresources", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": ["a-tag"], "optionally-blockable": []}}, {"delivery_value": "*", "origin": ["same-https", "same-http", "cross-https", "cross-http"], "delivery_type": "*", "name": "Skip-origins-not-applicable-to-websockets", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": ["websocket"], "optionally-blockable": []}}, {"delivery_value": "opt-in", "origin": "*", "delivery_type": "meta", "name": "Skip-redundant-for-opt-in-method", "expectation": "*", "expansion": "*", "redirection": ["keep-scheme", "swap-scheme"], "source_context_list": "*", "source_scheme": "*", "subresource": {"blockable": "*", "optionally-blockable": "*"}}], "specification": [{"test_expansion": [{"delivery_value": "opt-in", "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": [], "optionally-blockable": "*"}}, {"delivery_value": null, "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "no-opt-in-allows", "expectation": "allowed", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": [], "optionally-blockable": "*"}}], "description": "Test behavior of optionally-blockable content", "specification_url": "http://www.w3.org/TR/mixed-content/#category-optionally-blockable", "name": "optionally-blockable", "title": "Optionally-blockable content"}, {"test_expansion": [{"delivery_value": "opt-in", "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": []}}, {"delivery_value": null, "origin": ["cross-http", "same-http"], "delivery_type": "*", "name": "no-opt-in-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": []}}, {"delivery_value": "*", "origin": ["cross-ws", "same-ws"], "delivery_type": "*", "name": "ws-downgrade-blocks", "expectation": "blocked", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "websocket", "optionally-blockable": []}}], "description": "Test behavior of blockable content.", "specification_url": "http://www.w3.org/TR/mixed-content/#category-blockable", "name": "blockable", "title": "Blockable content"}, {"test_expansion": [{"delivery_value": "*", "origin": ["same-https"], "delivery_type": "*", "name": "allowed", "expectation": "allowed", "expansion": "default", "redirection": ["no-redirect", "keep-scheme"], "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "*", "optionally-blockable": "*"}}, {"delivery_value": "*", "origin": ["same-wss"], "delivery_type": "*", "name": "websocket-allowed", "expectation": "allowed", "expansion": "default", "redirection": ["no-redirect", "keep-scheme"], "source_context_list": "*", "source_scheme": "https", "subresource": {"blockable": "websocket", "optionally-blockable": []}}], "description": "Test behavior of allowed content.", "specification_url": "http://www.w3.org/TR/mixed-content/", "name": "allowed", "title": "Allowed content"}], "test_expansion_schema": {"delivery_value": [null, "opt-in"], "origin": ["same-https", "same-http", "cross-https", "cross-http", "same-wss", "same-ws", "cross-wss", "cross-ws"], "delivery_type": ["http-rp", "meta"], "subresource": {"blockable": ["script-tag", "link-css-tag", "xhr", "worker-classic", "worker-module", "worker-import-data", "worklet-animation", "worklet-audio", "worklet-layout", "worklet-paint", "worklet-animation-import-data", "worklet-audio-import-data", "worklet-layout-import-data", "worklet-paint-import-data", "fetch", "a-tag", "object-tag", "picture-tag", "websocket", "link-prefetch-tag", "beacon"], "optionally-blockable": ["img-tag", "audio-tag", "video-tag"]}, "expectation": ["allowed", "blocked"], "expansion": ["default", "override"], "redirection": ["no-redirect", "keep-scheme", "swap-scheme"], "source_context_list": ["top", "worker-classic-data", "worker-module-data"], "source_scheme": ["http", "https"]}, "source_context_list_schema": {"worker-classic-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "worker-classic-data", "policyDeliveries": []}]}, "top": {"subresourcePolicyDeliveries": [], "description": "Policy set by the top-level Document", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}]}, "worker-module-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "worker-module-data", "policyDeliveries": []}]}}, "delivery_key": "mixedContent", "source_context_schema": {"supported_delivery_type": {"iframe": ["http-rp", "meta"], "worker-module-data": [], "worker-classic-data": [], "top": ["http-rp", "meta"], "worker-classic": ["http-rp"], "iframe-blank": ["meta"], "worker-module": ["http-rp"], "srcdoc": ["meta"]}, "supported_subresource": {"iframe": "*", "worker-module-data": ["xhr", "fetch", "websocket"], "worker-classic-data": ["xhr", "fetch", "websocket"], "top": "*", "worker-classic": ["xhr", "fetch", "websocket"], "iframe-blank": "*", "worker-module": ["xhr", "fetch", "websocket"], "srcdoc": "*"}}};
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_capture_mouse.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_capture_mouse.html
index d8d54db6ba3..32056f09cc1 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_capture_mouse.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_capture_mouse.html
@@ -125,11 +125,10 @@
                 new test_driver.Actions().pointerMove(0, 0, {origin: target0}).send();
 
                 on_event(target1, "pointermove", function (event) {
-                        if(isPointerCapture == true) {
-                            test(function() {
-                                assert_unreached("pointermove shouldn't trigger for this target when capture is enabled");
-                            }, "pointermove shouldn't trigger for the purple rectangle while the black rectangle has capture");
-                        }
+                    test(function() {
+                        assert_false(isPointerCapture, "pointermove shouldn't trigger for this target when capture is enabled");
+                    }, "pointermove shouldn't trigger for the purple rectangle while the black rectangle has capture");
+
                     if(!pointermoveNoCaptureGot1) {
                         test_pointermove1.done();
                         event_log.push('pointermove@target1');
diff --git a/tests/wpt/web-platform-tests/referrer-policy/spec.src.json b/tests/wpt/web-platform-tests/referrer-policy/spec.src.json
index ab02dcc1b16..2674a45d6db 100644
--- a/tests/wpt/web-platform-tests/referrer-policy/spec.src.json
+++ b/tests/wpt/web-platform-tests/referrer-policy/spec.src.json
@@ -668,6 +668,9 @@
         "meta",
         "http-rp"
       ],
+      "iframe-blank": [
+        "meta"
+      ],
       "srcdoc": [
         "meta"
       ],
@@ -683,6 +686,7 @@
     "supported_subresource": {
       "top": "*",
       "iframe": "*",
+      "iframe-blank": "*",
       "srcdoc": "*",
       "worker-classic": [
         "xhr",
diff --git a/tests/wpt/web-platform-tests/referrer-policy/spec_json.js b/tests/wpt/web-platform-tests/referrer-policy/spec_json.js
index 1b507dbcf14..8a15eaee1eb 100644
--- a/tests/wpt/web-platform-tests/referrer-policy/spec_json.js
+++ b/tests/wpt/web-platform-tests/referrer-policy/spec_json.js
@@ -1 +1 @@
-var SPEC_JSON = {"subresource_schema": {"supported_delivery_type": {"img-tag": ["attr"], "sharedworker-classic": [], "xhr": [], "a-tag": ["attr", "rel-noref"], "area-tag": ["attr"], "iframe-tag": ["attr"], "worker-module": [], "script-tag": ["attr"], "fetch": [], "worker-classic": []}}, "excluded_tests": [{"delivery_value": "*", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin-workers", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgraded-protocol-workers", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "mixed-content-insecure-subresources", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "area-tag", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "area-tag"}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "worker-requests-with-swap-origin-redirect", "expectation": "*", "expansion": "*", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "overhead-for-redirection", "expectation": "*", "expansion": "*", "redirection": ["keep-origin", "swap-origin"], "source_context_list": "*", "source_scheme": "*", "subresource": ["a-tag", "area-tag"]}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "source-https-unsupported-by-web-platform-tests-runners", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": [null, "no-referrer-when-downgrade", "same-origin", "origin", "origin-when-cross-origin", "strict-origin", "strict-origin-when-cross-origin", "unsafe-url"], "origin": "*", "delivery_type": "rel-noref", "name": "<link rel=noreferrer>'s delivery_value should be no-referrer", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "specification": [{"test_expansion": [{"delivery_value": null, "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": null, "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": null, "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": null, "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that referrer URL follows no-referrer-when-downgrade policy when no explicit Referrer Policy is set.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policies", "name": "unset-referrer-policy", "title": "Referrer Policy is not explicitly defined"}, {"test_expansion": [{"delivery_value": "no-referrer", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that sub-resource never gets the referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-no-referrer", "name": "no-referrer", "title": "Referrer Policy is set to 'no-referrer'"}, {"test_expansion": [{"delivery_value": "no-referrer-when-downgrade", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that non a priori insecure subresource gets the full Referrer URL. A priori insecure subresource gets no referrer information.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-no-referrer-when-downgrade", "name": "no-referrer-when-downgrade", "title": "Referrer Policy is set to 'no-referrer-when-downgrade'"}, {"test_expansion": [{"delivery_value": "origin", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that all subresources in all casses get only the origin portion of the referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-origin", "name": "origin", "title": "Referrer Policy is set to 'origin'"}, {"test_expansion": [{"delivery_value": "same-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "same-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-secure-default", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "same-origin", "origin": ["same-http", "same-https"], "delivery_type": "*", "name": "same-origin-insecure", "expectation": "omitted", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}, {"delivery_value": "same-origin", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that cross-origin subresources get no referrer information and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-same-origin", "name": "same-origin", "title": "Referrer Policy is set to 'same-origin'"}, {"test_expansion": [{"delivery_value": "origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-secure-default", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-upgrade", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-downgrade", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": ["same-http", "same-https"], "delivery_type": "*", "name": "same-origin-insecure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that cross-origin subresources get the origin portion of the referrer URL and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-origin-when-cross-origin", "name": "origin-when-cross-origin", "title": "Referrer Policy is set to 'origin-when-cross-origin'"}, {"test_expansion": [{"delivery_value": "strict-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that non a priori insecure subresource gets only the origin portion of the referrer URL. A priori insecure subresource gets no referrer information.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin", "name": "strict-origin", "title": "Referrer Policy is set to 'strict-origin'"}, {"test_expansion": [{"delivery_value": "strict-origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-insecure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "cross-http", "delivery_type": "*", "name": "cross-insecure", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-secure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-secure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "cross-https", "delivery_type": "*", "name": "cross-secure", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that a priori insecure subresource gets no referrer information. Otherwise, cross-origin subresources get the origin portion of the referrer URL and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin-when-cross-origin", "name": "strict-origin-when-cross-origin", "title": "Referrer Policy is set to 'strict-origin-when-cross-origin'"}, {"test_expansion": [{"delivery_value": "unsafe-url", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that all sub-resources get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-unsafe-url", "name": "unsafe-url", "title": "Referrer Policy is set to 'unsafe-url'"}], "test_expansion_schema": {"delivery_value": [null, "no-referrer", "no-referrer-when-downgrade", "same-origin", "origin", "origin-when-cross-origin", "strict-origin", "strict-origin-when-cross-origin", "unsafe-url"], "origin": ["same-http", "same-https", "cross-http", "cross-https"], "delivery_type": ["attr", "rel-noref", "http-rp", "meta"], "subresource": ["iframe-tag", "img-tag", "script-tag", "a-tag", "area-tag", "xhr", "worker-classic", "worker-module", "sharedworker-classic", "fetch"], "expectation": ["omitted", "origin", "stripped-referrer"], "expansion": ["default", "override"], "redirection": ["no-redirect", "keep-origin", "swap-origin"], "source_context_list": ["top", "req", "srcdoc-inherit", "srcdoc", "iframe", "worker-classic", "worker-classic-data", "worker-module", "worker-module-data"], "source_scheme": ["http", "https"]}, "source_context_list_schema": {"srcdoc-inherit": {"subresourcePolicyDeliveries": [], "description": "srcdoc iframe should inherit parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "srcdoc"}]}, "worker-module": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-module", "policyDeliveries": ["policy"]}]}, "worker-module-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-module-data", "policyDeliveries": ["policy"]}]}, "worker-classic-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-classic-data", "policyDeliveries": ["policy"]}]}, "top": {"subresourcePolicyDeliveries": [], "description": "Policy set by the top-level Document", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}]}, "req": {"subresourcePolicyDeliveries": ["nonNullPolicy"], "description": "Subresource request's policy should override Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}]}, "worker-classic": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-classic", "policyDeliveries": ["policy"]}]}, "iframe": {"subresourcePolicyDeliveries": [], "description": "external iframe's policy should override parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "iframe", "policyDeliveries": ["policy"]}]}, "srcdoc": {"subresourcePolicyDeliveries": [], "description": "srcdoc iframe's policy should override parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "srcdoc", "policyDeliveries": ["nonNullPolicy"]}]}}, "delivery_key": "referrerPolicy", "source_context_schema": {"supported_delivery_type": {"iframe": ["meta", "http-rp"], "worker-module-data": [], "worker-classic-data": [], "top": ["meta", "http-rp"], "worker-classic": ["http-rp"], "worker-module": ["http-rp"], "srcdoc": ["meta"]}, "supported_subresource": {"iframe": "*", "worker-module-data": ["xhr", "fetch"], "worker-classic-data": ["xhr", "fetch"], "top": "*", "worker-classic": ["xhr", "fetch", "worker-classic", "worker-module"], "worker-module": ["xhr", "fetch", "worker-classic", "worker-module"], "srcdoc": "*"}}};
+var SPEC_JSON = {"subresource_schema": {"supported_delivery_type": {"img-tag": ["attr"], "sharedworker-classic": [], "xhr": [], "a-tag": ["attr", "rel-noref"], "area-tag": ["attr"], "iframe-tag": ["attr"], "worker-module": [], "script-tag": ["attr"], "fetch": [], "worker-classic": []}}, "excluded_tests": [{"delivery_value": "*", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin-workers", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgraded-protocol-workers", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "mixed-content-insecure-subresources", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "area-tag", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "area-tag"}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "worker-requests-with-swap-origin-redirect", "expectation": "*", "expansion": "*", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": ["worker-classic", "worker-module", "sharedworker-classic"]}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "overhead-for-redirection", "expectation": "*", "expansion": "*", "redirection": ["keep-origin", "swap-origin"], "source_context_list": "*", "source_scheme": "*", "subresource": ["a-tag", "area-tag"]}, {"delivery_value": "*", "origin": "*", "delivery_type": "*", "name": "source-https-unsupported-by-web-platform-tests-runners", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": [null, "no-referrer-when-downgrade", "same-origin", "origin", "origin-when-cross-origin", "strict-origin", "strict-origin-when-cross-origin", "unsafe-url"], "origin": "*", "delivery_type": "rel-noref", "name": "<link rel=noreferrer>'s delivery_value should be no-referrer", "expectation": "*", "expansion": "*", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "specification": [{"test_expansion": [{"delivery_value": null, "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": null, "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": null, "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": null, "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that referrer URL follows no-referrer-when-downgrade policy when no explicit Referrer Policy is set.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policies", "name": "unset-referrer-policy", "title": "Referrer Policy is not explicitly defined"}, {"test_expansion": [{"delivery_value": "no-referrer", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that sub-resource never gets the referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-no-referrer", "name": "no-referrer", "title": "Referrer Policy is set to 'no-referrer'"}, {"test_expansion": [{"delivery_value": "no-referrer-when-downgrade", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "no-referrer-when-downgrade", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that non a priori insecure subresource gets the full Referrer URL. A priori insecure subresource gets no referrer information.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-no-referrer-when-downgrade", "name": "no-referrer-when-downgrade", "title": "Referrer Policy is set to 'no-referrer-when-downgrade'"}, {"test_expansion": [{"delivery_value": "origin", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that all subresources in all casses get only the origin portion of the referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-origin", "name": "origin", "title": "Referrer Policy is set to 'origin'"}, {"test_expansion": [{"delivery_value": "same-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "same-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-secure-default", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "same-origin", "origin": ["same-http", "same-https"], "delivery_type": "*", "name": "same-origin-insecure", "expectation": "omitted", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}, {"delivery_value": "same-origin", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that cross-origin subresources get no referrer information and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-same-origin", "name": "same-origin", "title": "Referrer Policy is set to 'same-origin'"}, {"test_expansion": [{"delivery_value": "origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-secure-default", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-origin-upgrade", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-origin-downgrade", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": ["same-http", "same-https"], "delivery_type": "*", "name": "same-origin-insecure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}, {"delivery_value": "origin-when-cross-origin", "origin": ["cross-http", "cross-https"], "delivery_type": "*", "name": "cross-origin", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that cross-origin subresources get the origin portion of the referrer URL and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-origin-when-cross-origin", "name": "origin-when-cross-origin", "title": "Referrer Policy is set to 'origin-when-cross-origin'"}, {"test_expansion": [{"delivery_value": "strict-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "insecure-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "secure-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that non a priori insecure subresource gets only the origin portion of the referrer URL. A priori insecure subresource gets no referrer information.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin", "name": "strict-origin", "title": "Referrer Policy is set to 'strict-origin'"}, {"test_expansion": [{"delivery_value": "strict-origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-insecure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-http", "delivery_type": "*", "name": "same-insecure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "cross-http", "delivery_type": "*", "name": "cross-insecure", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": ["same-https", "cross-https"], "delivery_type": "*", "name": "upgrade-protocol", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "http", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": ["same-http", "cross-http"], "delivery_type": "*", "name": "downgrade-protocol", "expectation": "omitted", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-secure", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "same-https", "delivery_type": "*", "name": "same-secure", "expectation": "origin", "expansion": "override", "redirection": "swap-origin", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}, {"delivery_value": "strict-origin-when-cross-origin", "origin": "cross-https", "delivery_type": "*", "name": "cross-secure", "expectation": "origin", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "https", "subresource": "*"}], "description": "Check that a priori insecure subresource gets no referrer information. Otherwise, cross-origin subresources get the origin portion of the referrer URL and same-origin get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin-when-cross-origin", "name": "strict-origin-when-cross-origin", "title": "Referrer Policy is set to 'strict-origin-when-cross-origin'"}, {"test_expansion": [{"delivery_value": "unsafe-url", "origin": "*", "delivery_type": "*", "name": "generic", "expectation": "stripped-referrer", "expansion": "default", "redirection": "*", "source_context_list": "*", "source_scheme": "*", "subresource": "*"}], "description": "Check that all sub-resources get the stripped referrer URL.", "specification_url": "https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-unsafe-url", "name": "unsafe-url", "title": "Referrer Policy is set to 'unsafe-url'"}], "test_expansion_schema": {"delivery_value": [null, "no-referrer", "no-referrer-when-downgrade", "same-origin", "origin", "origin-when-cross-origin", "strict-origin", "strict-origin-when-cross-origin", "unsafe-url"], "origin": ["same-http", "same-https", "cross-http", "cross-https"], "delivery_type": ["attr", "rel-noref", "http-rp", "meta"], "subresource": ["iframe-tag", "img-tag", "script-tag", "a-tag", "area-tag", "xhr", "worker-classic", "worker-module", "sharedworker-classic", "fetch"], "expectation": ["omitted", "origin", "stripped-referrer"], "expansion": ["default", "override"], "redirection": ["no-redirect", "keep-origin", "swap-origin"], "source_context_list": ["top", "req", "srcdoc-inherit", "srcdoc", "iframe", "worker-classic", "worker-classic-data", "worker-module", "worker-module-data"], "source_scheme": ["http", "https"]}, "source_context_list_schema": {"srcdoc-inherit": {"subresourcePolicyDeliveries": [], "description": "srcdoc iframe should inherit parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}, {"sourceContextType": "srcdoc"}]}, "worker-module": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-module", "policyDeliveries": ["policy"]}]}, "worker-module-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-module-data", "policyDeliveries": ["policy"]}]}, "worker-classic-data": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-classic-data", "policyDeliveries": ["policy"]}]}, "top": {"subresourcePolicyDeliveries": [], "description": "Policy set by the top-level Document", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["policy"]}]}, "req": {"subresourcePolicyDeliveries": ["nonNullPolicy"], "description": "Subresource request's policy should override Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}]}, "worker-classic": {"subresourcePolicyDeliveries": [], "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "worker-classic", "policyDeliveries": ["policy"]}]}, "iframe": {"subresourcePolicyDeliveries": [], "description": "external iframe's policy should override parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "iframe", "policyDeliveries": ["policy"]}]}, "srcdoc": {"subresourcePolicyDeliveries": [], "description": "srcdoc iframe's policy should override parent Document's policy", "sourceContextList": [{"sourceContextType": "top", "policyDeliveries": ["anotherPolicy"]}, {"sourceContextType": "srcdoc", "policyDeliveries": ["nonNullPolicy"]}]}}, "delivery_key": "referrerPolicy", "source_context_schema": {"supported_delivery_type": {"iframe": ["meta", "http-rp"], "worker-module-data": [], "worker-classic-data": [], "top": ["meta", "http-rp"], "worker-classic": ["http-rp"], "iframe-blank": ["meta"], "worker-module": ["http-rp"], "srcdoc": ["meta"]}, "supported_subresource": {"iframe": "*", "worker-module-data": ["xhr", "fetch"], "worker-classic-data": ["xhr", "fetch"], "top": "*", "worker-classic": ["xhr", "fetch", "worker-classic", "worker-module"], "iframe-blank": "*", "worker-module": ["xhr", "fetch", "worker-classic", "worker-module"], "srcdoc": "*"}}};
diff --git a/tests/wpt/web-platform-tests/resources/chromium/nfc-mock.js b/tests/wpt/web-platform-tests/resources/chromium/nfc-mock.js
index d279fcf40d8..811c0aeafce 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/nfc-mock.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/nfc-mock.js
@@ -32,7 +32,7 @@ function toMojoNDEFRecord(record) {
 }
 
 function toByteArray(data) {
-  // Convert JS objects to byte array.
+  // Converts JS objects to byte array.
   let byteArray = new Uint8Array(0);
   let tmpData = data;
 
@@ -53,7 +53,7 @@ function toByteArray(data) {
 function compareNDEFRecords(providedRecord, receivedRecord) {
   assert_equals(providedRecord.recordType, receivedRecord.recordType);
 
-  // Compare media types without charset.
+  // Compares media types without charset.
   // Charset should be compared when watch method is implemented, in order
   // to check that written and read strings are equal.
   assert_equals(providedRecord.mediaType,
@@ -176,6 +176,8 @@ var WebNFCTest = (() => {
       this.watchers_ = [];
       this.reading_messages_ = [];
       this.operations_suspended_ = false;
+      this.is_ndef_tech_ = true;
+      this.is_formatted_tag_ = false;
     }
 
     // NFC delegate functions.
@@ -183,7 +185,7 @@ var WebNFCTest = (() => {
       let error = this.getHWError();
       if (error)
         return error;
-      // Cancel previous pending push operation.
+      // Cancels previous pending push operation.
       if (this.pending_promise_func_) {
         this.cancelPendingPushOperation();
       }
@@ -193,16 +195,23 @@ var WebNFCTest = (() => {
 
       return new Promise(resolve => {
         this.pending_promise_func_ = resolve;
-        // Pend push operation if NFC operation is suspended.
         if (this.operations_suspended_) {
-          // Do nothing, pends push operation.
+          // Pends push operation if NFC operation is suspended.
         } else if (options.timeout && options.timeout !== Infinity &&
             !this.push_completed_) {
-          // Resolve with TimeoutError, else pend push operation.
+          // Resolves with TimeoutError, else pend push operation.
           if (this.push_should_timeout_) {
             resolve(
                 createNDEFError(device.mojom.NDEFErrorType.TIMER_EXPIRED));
           }
+        } else if (!this.is_ndef_tech_) {
+          // Resolves with NotSupportedError if the device does not expose
+          // NDEF technology.
+          resolve(createNDEFError(device.mojom.NDEFErrorType.NOT_SUPPORTED));
+        } else if (this.is_formatted_tag_ && !options.overwrite) {
+          // Resolves with NotAllowedError if there are NDEF records on the device
+          // and overwrite is false.
+          resolve(createNDEFError(device.mojom.NDEFErrorType.NOT_ALLOWED));
         } else {
           resolve(createNDEFError(null));
         }
@@ -230,8 +239,9 @@ var WebNFCTest = (() => {
       }
 
       this.watchers_.push({id: id, options: options});
-      // Ignore reading if NFC operation is suspended.
-      if(!this.operations_suspended_) {
+      // Ignores reading if NFC operation is suspended
+      // or the NFC tag does not expose NDEF technology.
+      if(!this.operations_suspended_ && this.is_ndef_tech_) {
         // Triggers onWatch if the new watcher matches existing messages.
         for (let message of this.reading_messages_) {
           if (matchesWatchOptions(message, options)) {
@@ -301,6 +311,8 @@ var WebNFCTest = (() => {
       this.cancelPendingPushOperation();
       this.bindingSet_.closeAllBindings();
       this.interceptor_.stop();
+      this.is_ndef_tech_ = true;
+      this.is_formatted_tag_ = false;
     }
 
     cancelPendingPushOperation() {
@@ -319,9 +331,11 @@ var WebNFCTest = (() => {
     // Sets message that is used to deliver NFC reading updates.
     setReadingMessage(message) {
       this.reading_messages_.push(message);
-      // Ignore reading if NFC operation is suspended.
+      // Ignores reading if the NFC tag does not expose NDEF technology.
+      if(!this.is_ndef_tech_) return;
+      // Ignores reading if NFC operation is suspended.
       if(this.operations_suspended_) return;
-      // Ignore reading if NDEFPushOptions.ignoreRead is true.
+      // Ignores reading if NDEFPushOptions.ignoreRead is true.
       if(this.push_options_ && this.push_options_.ignoreRead)
         return;
       // Triggers onWatch if the new message matches existing watchers.
@@ -350,7 +364,7 @@ var WebNFCTest = (() => {
       // Resumes pending NFC reading.
       for (let watcher of this.watchers_) {
         for (let message of this.reading_messages_) {
-          if (matchesWatchOptions(message, watcher.options)) {
+          if (matchesWatchOptions(message, watcher.options) && this.is_ndef_tech_) {
             this.client_.onWatch(
                 [watcher.id], fake_tag_serial_number,
                 toMojoNDEFMessage(message));
@@ -362,6 +376,14 @@ var WebNFCTest = (() => {
         this.pending_promise_func_(createNDEFError(null));
       }
     }
+
+    setIsNDEFTech(isNdef) {
+      this.is_ndef_tech_ = isNdef;
+    }
+
+    setIsFormattedTag(isFormatted) {
+      this.is_formatted_tag_ = isFormatted;
+    }
   }
 
   let testInternal = {
@@ -371,7 +393,7 @@ var WebNFCTest = (() => {
 
   class NFCTestChromium {
     constructor() {
-      Object.freeze(this); // Make it immutable.
+      Object.freeze(this); // Makes it immutable.
     }
 
     initialize() {
diff --git a/tests/wpt/web-platform-tests/resources/testharness.js b/tests/wpt/web-platform-tests/resources/testharness.js
index 9f7426b7d36..a44185c1eaf 100644
--- a/tests/wpt/web-platform-tests/resources/testharness.js
+++ b/tests/wpt/web-platform-tests/resources/testharness.js
@@ -3704,7 +3704,13 @@ policies and contribution forms [3].
         }, false);
 
         addEventListener("unhandledrejection", function(e) {
-            var message = "Unhandled rejection: " + e.reason.message;
+            var reason;
+            if (e.reason) {
+                reason  = e.reason.message ? e.reason.message : e.reason;
+            } else {
+                reason = e;
+            }
+            var message = "Unhandled rejection: " + reason;
             // There's no stack for unhandled rejections.
             error_handler(message);
         }, false);
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html
index 901c158f601..ca2f884a9b3 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html
@@ -7,34 +7,27 @@
 </head>
 <body>
 <script>
-var scope = "resources";
-var registration;
+const scope = "./resources/in-scope";
 
 promise_test(async (test) => {
-    registration = await navigator.serviceWorker.register("fetch-error-worker.js", { scope : scope });
-    var activeWorker = registration.active;
-    if (activeWorker)
-        return;
-    activeWorker = registration.installing;
-    return new Promise(resolve => {
-        activeWorker.addEventListener('statechange', () => {
-            if (activeWorker.state === "activated")
-                resolve();
-        });
-    });
+    const registration = await service_worker_unregister_and_register(
+        test, "./resources/fetch-error-worker.js", scope);
+    promise_test(async () => registration.unregister(),
+                 "Unregister service worker");
+    await wait_for_state(test, registration.installing, 'activated');
 }, "Setup service worker");
 
 promise_test(async (test) => {
     const iframe = await with_iframe(scope);
-
+    test.add_cleanup(() => iframe.remove());
     const response = await iframe.contentWindow.fetch("fetch-error-test");
-    await response.text().then(assert_unreached, (error) => { assert_true(error.message.includes("Sorry")); });
-    iframe.remove();
+    try {
+      await response.text();
+      assert_unreached();
+    } catch (error) {
+      assert_true(error.message.includes("Sorry"));
+    }
 }, "Make sure a load that makes progress does not time out");
-
-promise_test(async () => {
-    registration.unregister();
-}, "Unregister service worker");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error-worker.js b/tests/wpt/web-platform-tests/service-workers/service-worker/resources/fetch-error-worker.js
similarity index 100%
rename from tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error-worker.js
rename to tests/wpt/web-platform-tests/service-workers/service-worker/resources/fetch-error-worker.js
diff --git a/tests/wpt/web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html b/tests/wpt/web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html
index babe1760c70..9c61f663f88 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/focus/focus-method-delegatesFocus.html
@@ -228,5 +228,13 @@ test(() => {
   assert_equals(document.activeElement, slottedToFirstSlot);
 }, "focus() on host with delegatesFocus & tabindex=0, #slottedToFirstSlot, #slottedToSecondSlot, #belowSlots  with tabindex=0");
 
+test(() => {
+  resetTabIndexAndFocus();
+  setTabIndex([aboveSlots, belowSlots], 0);
+  belowSlots.focus();
+  host.focus();
+  assert_equals(shadowRoot.activeElement, belowSlots);
+}, "focus() on host with delegatesFocus and already-focused non-first shadow descendant");
+
 </script>
 
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml b/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml
index 195cdee8edf..76852b58cd3 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml
@@ -4,6 +4,7 @@
 steps:
 - powershell: |
     function UninstallEdge($edgePath, $uninstallArgs) {
+      $exitCode = 0
       try {
         cmd /c taskkill /f /im msedge* `> nul 2`> nul
         cmd /c taskkill /f /im setup.exe `> nul 2`> nul
@@ -11,8 +12,11 @@ steps:
           $installerPath = Get-ChildItem -PATH $edgePath -Filter "setup.exe" -Recurse | Select -First 1 FullName
           if(-not($installerPath -eq $nul) -and (Test-Path $installerPath.FullName)) {
             Write-Host "Uninstall: $($installerPath.FullName) $uninstallArgs"
-            Start-Process "$($installerPath.FullName)" -ArgumentList $uninstallArgs -Wait
-            Remove-Item -Path $edgePath -Recurse -Force -ErrorAction SilentlyContinue
+            $setup = Start-Process "$($installerPath.FullName)" -ArgumentList $uninstallArgs -PassThru -Wait
+            $exitCode = $setup.ExitCode
+            if ($exitCode -ne $exitCodeSuccess) {
+              Write-Host "Uninstall failed with ExitCode=$exitCode"
+            }
           } else {
             Write-Host "Failed to find setup.exe under $edgePath"
           }
@@ -20,24 +24,27 @@ steps:
       } catch [Exception] {
         Write-Host "Failed to uninstall Edge from $edgePath. ERROR= $($_.Exception.Message)" -ForegroundColor Red
       }
+      return $exitCode
     }
 
     function IsEdgeRunning() {
       return (Get-Process | Where-Object { $_.Name -eq "msedge" }).Length -gt 0
     }
 
+    # Uninstall exit code success for Edge
+    $exitCodeSuccess = 19
     # restore hosts file
     $hostFile = "$env:systemroot\System32\drivers\etc\hosts"
     Copy-Item -Path "$hostFile.back" -Destination $hostFile -Force
 
     # uninstall Edge
-    UninstallEdge "$env:localappdata\Microsoft\Edge\Application" "--uninstall --force-uninstall"
-    # uninstall Edge Canary channel
-    UninstallEdge "$env:localappdata\Microsoft\Edge SxS\Application" "--uninstall --msedge-sxs --system-level --force-uninstall"
-    # uninstall Edge Dev channel
-    UninstallEdge "$env:systemdrive\Program Files (x86)\Microsoft\Edge Dev\Application" "--uninstall --msedge-dev --system-level --force-uninstall"
+    $stableExitCode = UninstallEdge "$env:localappdata\Microsoft\Edge" "--uninstall --force-uninstall --verbose-logging"
     # uninstall Edge Beta channel
-    UninstallEdge "$env:systemdrive\Program Files (x86)\Microsoft\Edge Beta\Application" "--uninstall --msedge-beta --system-level --force-uninstall"
+    $betaExitCode = UninstallEdge "$env:systemdrive\Program Files (x86)\Microsoft\Edge Beta" "--uninstall --msedge-beta --force-uninstall --verbose-logging"
+    # uninstall Edge Dev channel
+    $devExitCode = UninstallEdge "$env:systemdrive\Program Files (x86)\Microsoft\Edge Dev" "--uninstall --msedge-dev --force-uninstall --verbose-logging"
+    # uninstall Edge Canary channel
+    $canaryExitCode = UninstallEdge "$env:localappdata\Microsoft\Edge SxS" "--uninstall --msedge-sxs --force-uninstall --verbose-logging"
 
     # Check if Edge is still running and try to close it.
     # If we fail to close it, then reboot the system
@@ -50,7 +57,41 @@ steps:
         Restart-Computer -Force
       }
     }
+    if (($stableExitCode -ne $exitCodeSuccess) -and
+        ($betaExitCode -ne $exitCodeSuccess) -and
+        ($devExitCode -ne $exitCodeSuccess) -and
+        ($canaryExitCode -ne $exitCodeSuccess)) {
+      Copy-Item -Path "$env:temp\*edge*.log" -Destination $(Build.ArtifactStagingDirectory) -Force
+      Throw "Failed to uninstall Edge."
+    } else {
+      Write-Host "Successfully uninstalled all Edge channels"
+    }
   displayName: 'Restore hosts file and cleanup test machine'
   condition: always()
   errorActionPreference: silentlyContinue
   ignoreLASTEXITCODE: true
+
+- powershell: |
+    $channels = @('Edge', 'Edge Beta', 'Edge Dev', 'Edge SxS')
+    foreach ($channel in $channels) {
+      Write-Host "Deleting regkeys for $channel folder"
+      Remove-Item -Path "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft $channel" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft $channel" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKLM:SOFTWARE\WOW6432Node\Microsoft\EdgeUpdate" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKLM:SOFTWARE\WOW6432Node\Microsoft\$channel" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKLM:SOFTWARE\Microsoft\EdgeUpdate" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKLM:SOFTWARE\Microsoft\$channel" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKCU:SOFTWARE\Microsoft\EdgeUpdate" -Recurse -Force -ErrorAction SilentlyContinue
+      Remove-Item -Path "HKCU:SOFTWARE\Microsoft\$channel" -Recurse -Force -ErrorAction SilentlyContinue
+
+      Write-Host "Deleting all remaining Edge folders"
+      Remove-Item -Path "$env:localappdata\Microsoft\EdgeUpdate" -Recurse -Force -ErrorAction SilentlyContinue
+      $edgePath = "$env:localappdata\Microsoft\$channel"
+      Remove-Item -Path $edgePath -Recurse -Force -ErrorAction SilentlyContinue
+      $edgePath = "$env:systemdrive\Program Files (x86)\Microsoft\$channel"
+      Remove-Item -Path $edgePath -Recurse -Force -ErrorAction SilentlyContinue
+    }
+  displayName: 'Cleanup Edge registry'
+  condition: always()
+  errorActionPreference: silentlyContinue
+  ignoreLASTEXITCODE: true
diff --git a/tests/wpt/web-platform-tests/tools/ci/website_build.sh b/tests/wpt/web-platform-tests/tools/ci/website_build.sh
index d23829f0bcd..f6b26310aab 100755
--- a/tests/wpt/web-platform-tests/tools/ci/website_build.sh
+++ b/tests/wpt/web-platform-tests/tools/ci/website_build.sh
@@ -52,6 +52,10 @@ touch .nojekyll
 # Publish the website by pushing the built contents to the `gh-pages` branch
 git add .
 
+echo This submission alters the compiled files as follows
+
+git diff --staged
+
 if is_pull_request ; then
   echo Submission comes from a pull request. Exiting without publishing.
 
diff --git a/tests/wpt/web-platform-tests/tools/manifest/vcs.py b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
index d87e804c359..d4f47f6bf0a 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/vcs.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
@@ -278,12 +278,11 @@ def walk(root):
 
     Unlike os.walk the implementation is not recursive."""
 
-    listdir = os.listdir
     get_stat = os.stat
-    listdir = os.listdir
-    join = os.path.join
     is_dir = stat.S_ISDIR
     is_link = stat.S_ISLNK
+    join = os.path.join
+    listdir = os.listdir
     relpath = os.path.relpath
 
     root = os.path.abspath(root)
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_webkit.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_webkit.txt
index 25cc5846ee7..f85779a40bd 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_webkit.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_webkit.txt
@@ -1,2 +1 @@
-mozprocess == 0.26
-selenium == 3.9.0
+mozprocess==0.26
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index 77fe2971940..14f456aa476 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -841,7 +841,7 @@ class MarionetteRefTestExecutor(RefTestExecutor):
         return self.convert_result(test, result)
 
     def screenshot(self, test, viewport_size, dpi):
-        # https://github.com/w3c/wptrunner/issues/166
+        # https://github.com/web-platform-tests/wpt/issues/7135
         assert viewport_size is None
         assert dpi is None
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
index 5246a26fcbf..913a5e6d542 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorselenium.py
@@ -383,7 +383,7 @@ class SeleniumRefTestExecutor(RefTestExecutor):
         return self.convert_result(test, result)
 
     def screenshot(self, test, viewport_size, dpi):
-        # https://github.com/w3c/wptrunner/issues/166
+        # https://github.com/web-platform-tests/wpt/issues/7135
         assert viewport_size is None
         assert dpi is None
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservodriver.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
index 12a750fa0a3..67a433d9a58 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
@@ -282,7 +282,7 @@ class ServoWebDriverRefTestExecutor(RefTestExecutor):
             return test.result_cls("INTERNAL-ERROR", message), []
 
     def screenshot(self, test, viewport_size, dpi):
-        # https://github.com/w3c/wptrunner/issues/166
+        # https://github.com/web-platform-tests/wpt/issues/7135
         assert viewport_size is None
         assert dpi is None
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index 65b6723cb82..a2601978b57 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -454,7 +454,7 @@ class WebDriverRefTestExecutor(RefTestExecutor):
         return self.convert_result(test, result)
 
     def screenshot(self, test, viewport_size, dpi):
-        # https://github.com/w3c/wptrunner/issues/166
+        # https://github.com/web-platform-tests/wpt/issues/7135
         assert viewport_size is None
         assert dpi is None
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
index c2cb5c4d26b..56fbf081119 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/testrunner.py
@@ -707,6 +707,7 @@ class TestRunnerManager(threading.Thread):
         if self.test_runner_proc is None:
             return
 
+        self.browser.stop(force=True)
         self.logger.debug("waiting for runner process to end")
         self.test_runner_proc.join(10)
         self.logger.debug("After join")
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
index 8b711272c7b..162ffae3fc9 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
@@ -83,7 +83,10 @@ class WebDriverServer(object):
     def stop(self, force=False):
         self.logger.debug("Stopping WebDriver")
         if self.is_alive:
-            return self._proc.kill()
+            kill_result = self._proc.kill()
+            if force and kill_result != 0:
+                return self._proc.kill(9)
+            return kill_result
         return not self.is_alive
 
     @property
diff --git a/tests/wpt/web-platform-tests/url/resources/setters_tests.json b/tests/wpt/web-platform-tests/url/resources/setters_tests.json
index 6b7d19b1016..d54335f1bad 100644
--- a/tests/wpt/web-platform-tests/url/resources/setters_tests.json
+++ b/tests/wpt/web-platform-tests/url/resources/setters_tests.json
@@ -686,6 +686,17 @@
                 "port": "2"
             }
         },
+        {
+            "comment": "IPv6 literal address with port, crbug.com/1012416",
+            "href": "http://example.net",
+            "new_value": "[2001:db8::2]:4002",
+            "expected": {
+                "href": "http://[2001:db8::2]:4002/",
+                "host": "[2001:db8::2]:4002",
+                "hostname": "[2001:db8::2]",
+                "port": "4002"
+             }
+        },
         {
             "comment": "Default port number is removed",
             "href": "http://example.net",
diff --git a/tests/wpt/web-platform-tests/web-animations/interfaces/Document/getAnimations.html b/tests/wpt/web-platform-tests/web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html
similarity index 61%
rename from tests/wpt/web-platform-tests/web-animations/interfaces/Document/getAnimations.html
rename to tests/wpt/web-platform-tests/web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html
index f6a6c3edd44..4730f186b34 100644
--- a/tests/wpt/web-platform-tests/web-animations/interfaces/Document/getAnimations.html
+++ b/tests/wpt/web-platform-tests/web-animations/interfaces/DocumentOrShadowRoot/getAnimations.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <meta charset=utf-8>
-<title>Document.getAnimations</title>
-<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-document-getanimations">
+<title>DocumentOrShadowRoot.getAnimations</title>
+<link rel="help" href="https://drafts.csswg.org/web-animations-1/#dom-documentorshadowroot-getanimations">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="../../testcommon.js"></script>
@@ -17,7 +17,8 @@ test(t => {
   assert_equals(document.getAnimations().length, 0,
                 'getAnimations returns an empty sequence for a document ' +
                 'with no animations');
-}, 'Test document.getAnimations for non-animated content');
+}, 'Document.getAnimations() returns an empty sequence for non-animated'
+   + ' content');
 
 test(t => {
   const div = createDiv(t);
@@ -30,7 +31,7 @@ test(t => {
   anim2.finish();
   assert_equals(document.getAnimations().length, 0,
                 'getAnimation only returns running animations');
-}, 'Test document.getAnimations for script-generated animations')
+}, 'Document.getAnimations() returns script-generated animations')
 
 test(t => {
   const div = createDiv(t);
@@ -39,7 +40,8 @@ test(t => {
   assert_array_equals(document.getAnimations(),
                       [ anim1, anim2 ],
                       'getAnimations() returns running animations');
-}, 'Test the order of document.getAnimations with script generated animations')
+}, 'Document.getAnimations() returns script-generated animations in the order'
+   + ' they were created')
 
 test(t => {
   // This element exists but is not a descendent of any document, so isn't
@@ -52,7 +54,7 @@ test(t => {
   document.body.appendChild(div);
   t.add_cleanup(() => { div.remove(); });
   assert_equals(document.getAnimations().length, 1);
-}, 'Test document.getAnimations for a disconnected node');
+}, 'Document.getAnimations() does not return a disconnected node');
 
 test(t => {
   const effect = new KeyframeEffect(null, gKeyFrames, 100 * MS_PER_SEC);
@@ -62,7 +64,7 @@ test(t => {
   assert_equals(document.getAnimations().length, 0,
                 'document.getAnimations() only returns animations targeting ' +
                 'elements in this document');
-}, 'Test document.getAnimations with null target');
+}, 'Document.getAnimations() does not return an animation with a null target');
 
 promise_test(async t => {
   const iframe = document.createElement('iframe');
@@ -86,7 +88,66 @@ promise_test(async t => {
   assert_equals(document.getAnimations().length, 0);
   assert_equals(iframe.contentDocument.getAnimations().length, 1);
   anim.finish();
-}, 'Test document.getAnimations for elements inside same-origin iframes');
+}, 'Document.getAnimations() returns animations on elements inside same-origin'
+   + ' iframes');
+
+test(t => {
+  const div = createDiv(t);
+  const shadow = div.attachShadow({ mode: 'open' });
+
+  // Create a tree with the following structure
+  //
+  //             div
+  //              |
+  //         (ShadowRoot)
+  //           /     \
+  //       childA  childB
+  //      (*anim2)   |
+  //              grandChild
+  //               (*anim1)
+  //
+  // This lets us test that:
+  //
+  // a) All children of the ShadowRoot are included
+  // b) Descendants of the children are included
+  // c) The result is sorted by composite order (since we fire anim1 before
+  //    anim2 despite childA appearing first in tree order)
+
+  const childA = createDiv(t);
+  shadow.append(childA);
+
+  const childB = createDiv(t);
+  shadow.append(childB);
+
+  const grandChild = createDiv(t);
+  childB.append(grandChild);
+
+  const anim1 = grandChild.animate(gKeyFrames, 100 * MS_PER_SEC)
+  const anim2 = childA.animate(gKeyFrames, 100 * MS_PER_SEC)
+
+  assert_array_equals(
+    div.shadowRoot.getAnimations(),
+    [ anim1, anim2 ],
+    'getAnimations() called on ShadowRoot returns expected animations'
+  );
+}, 'ShadowRoot.getAnimations() return all animations in the shadow tree');
+
+test(t => {
+  const div = createDiv(t);
+  const shadow = div.attachShadow({ mode: 'open' });
+
+  const child = createDiv(t);
+  shadow.append(child);
+
+  child.animate(gKeyFrames, 100 * MS_PER_SEC)
+
+  assert_array_equals(
+    document.getAnimations(),
+    [],
+    'getAnimations() called on Document does not return animations from shadow'
+    + ' trees'
+  );
+}, 'Document.getAnimations() does NOT return animations in shadow trees');
 
 promise_test(async t => {
   const div = createDiv(t);
@@ -114,7 +175,7 @@ promise_test(async t => {
 
   // If getAnimations() flushed style, we should get a transitionrun event.
   await watcher.wait_for('transitionrun');
-}, 'Triggers a style change event');
+}, 'Document.getAnimations() triggers a style change event');
 
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan.https.html b/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan.https.html
index 0a361009948..3fe95cc9147 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan.https.html
@@ -191,4 +191,34 @@ test(() => {
   });
 }, "NDEFReader.scan should fail if signal is not an AbortSignal.");
 
+nfc_test(async (t, mockNFC) => {
+  const reader = new NDEFReader();
+  mockNFC.setIsNDEFTech(false);
+  mockNFC.setReadingMessage(createMessage([createTextRecord(test_text_data)]));
+
+  await new Promise((resolve, reject) => {
+    reader.onreading = () => reject("reading event should not be fired.");
+    reader.scan();
+    t.step_timeout(resolve, 100);
+  });
+}, "Test that NDEFReader.onreading should not be fired if the NFC tag does not \
+expose NDEF technology.");
+
+nfc_test(async (t, mockNFC) => {
+  const reader = new NDEFReader();
+  const controller = new AbortController();
+  mockNFC.setReadingMessage({ records: [] });
+  const readerWatcher = new EventWatcher(t, reader, ["reading", "error"]);
+
+  const promise = readerWatcher.wait_for("reading").then(event => {
+    assert_equals(event.serialNumber, fake_tag_serial_number);
+    assert_equals(event.message.records.length, 0);
+    controller.abort();
+  });
+  // NDEFReader#scan() asynchronously dispatches the reading event.
+  reader.scan({signal : controller.signal});
+  await promise;
+}, "Test that NDEFReader.onreading should be fired on an unformatted NFC tag \
+with empty records array for NDEFMessage.");
+
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NDEFWriter_push.https.html b/tests/wpt/web-platform-tests/web-nfc/NDEFWriter_push.https.html
index b909bee3171..0d5722bfa01 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NDEFWriter_push.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NDEFWriter_push.https.html
@@ -19,6 +19,10 @@ const invalid_type_messages =
       // https://w3c.github.io/web-nfc/#the-push-method - Step 8.
       createMessage([{}]),
 
+      // NDEFMessageSource: not NDEF-formatable.
+      // https://w3c.github.io/web-nfc/#the-push-method - Step 8.
+      createMessage([]),
+
       // https://w3c.github.io/web-nfc/#dfn-map-text-to-ndef
       // NDEFRecord must have data.
       createMessage([createTextRecord()]),
@@ -442,4 +446,35 @@ nfc_test(async (t, mockNFC) => {
 }, "Test that mediaType should be set to 'application/octet-stream' if \
 NDEFRecordInit.record's recordType is external type and NDEFRecordInit.record's \
 mediaType is undefined.");
+
+nfc_test(async (t, mockNFC) => {
+  const writer = new NDEFWriter();
+  mockNFC.setIsNDEFTech(false);
+  await promise_rejects(t, 'NotSupportedError', writer.push(test_text_data));
+}, "NDEFWriter.push should fail when the NFC device does not expose \
+NDEF technology.");
+
+nfc_test(async (t, mockNFC) => {
+  const writer = new NDEFWriter();
+  await writer.push(test_text_data, { overwrite: false });
+  assertNDEFMessagesEqual(test_text_data, mockNFC.pushedMessage());
+}, "NDEFWriter.push should succeed to push data to an unformatted NFC device \
+when the NDEFPushOptions.overwrite is false.");
+
+nfc_test(async (t, mockNFC) => {
+  const writer = new NDEFWriter();
+  await writer.push(test_buffer_data);
+  assertNDEFMessagesEqual(test_buffer_data, mockNFC.pushedMessage());
+  await writer.push(test_text_data, { overwrite: true });
+  assertNDEFMessagesEqual(test_text_data, mockNFC.pushedMessage());
+}, "NDEFWriter.push should succeed to overwrite the existing data \
+when the NDEFPushOptions.overwrite is true.");
+
+nfc_test(async (t, mockNFC) => {
+  const writer = new NDEFWriter();
+  const p = writer.push(test_text_data, { overwrite: false });
+  mockNFC.setIsFormattedTag(true);
+  await promise_rejects(t, 'NotAllowedError', p);
+}, "NDEFWriter.push should fail when there are NDEF records on the NFC device \
+and NDEFPushOptions.overwrite is false.");
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/README.md b/tests/wpt/web-platform-tests/web-nfc/README.md
index 87145b0e3ec..0787f1f6712 100644
--- a/tests/wpt/web-platform-tests/web-nfc/README.md
+++ b/tests/wpt/web-platform-tests/web-nfc/README.md
@@ -17,6 +17,8 @@ The `WebNFCTest` interface is defined as:
     setPushShouldTimeout(boolean result); // Sets flag to trigger the pending push to timeout.
     pushedMessage(); // Gets the pushed `NDEFMessageSource`.
     pushOptions(); // Gets the pushed `NDEFPushOptions`.
+    setIsNDEFTech(boolean isNDEF); // Sets if the NFC device exposes NDEF technology.
+    setIsFormattedTag(boolean isFormatted); // Sets if the NFC tag has formatted NDEF message.
   };
 ```