diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 6f0b39a8648..0681b77f4ec 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -130291,6 +130291,18 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-overflow-clip-positioned.html": [
+    [
+     "css/css-multicol/multicol-overflow-clip-positioned.html",
+     [
+      [
+       "/css/css-multicol/multicol-overflow-clip-positioned-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-overflowing-001.xht": [
     [
      "css/css-multicol/multicol-overflowing-001.xht",
@@ -201726,6 +201738,18 @@
      ],
      {}
     ]
+   ],
+   "xhtml/adopt-while-parsing-001.html": [
+    [
+     "xhtml/adopt-while-parsing-001.html",
+     [
+      [
+       "/xhtml/adopt-while-parsing-001-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
    ]
   },
   "reftest_node": {
@@ -270360,6 +270384,11 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-overflow-clip-positioned-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-overflowing-001-ref.xht": [
     [
      {}
@@ -292215,6 +292244,31 @@
      {}
     ]
    ],
+   "feature-policy/parameters/feature-parameters-inf.html": [
+    [
+     {}
+    ]
+   ],
+   "feature-policy/parameters/feature-parameters-inf.html.headers": [
+    [
+     {}
+    ]
+   ],
+   "feature-policy/parameters/feature-parameters.html.headers": [
+    [
+     {}
+    ]
+   ],
+   "feature-policy/parameters/resources/feature-parameters-frame.html": [
+    [
+     {}
+    ]
+   ],
+   "feature-policy/parameters/resources/sample-1.png": [
+    [
+     {}
+    ]
+   ],
    "feature-policy/payment-allowed-by-feature-policy.https.sub.html.headers": [
     [
      {}
@@ -308850,6 +308904,11 @@
      {}
     ]
    ],
+   "portals/resources/portal-create-orphaned.html": [
+    [
+     {}
+    ]
+   ],
    "portals/resources/portal-cross-origin.sub.html": [
     [
      {}
@@ -326485,21 +326544,6 @@
      {}
     ]
    ],
-   "upgrade-insecure-requests/support/pass.png": [
-    [
-     {}
-    ]
-   ],
-   "upgrade-insecure-requests/support/pass.png.headers": [
-    [
-     {}
-    ]
-   ],
-   "upgrade-insecure-requests/support/post-origin-to-parent.html": [
-    [
-     {}
-    ]
-   ],
    "upgrade-insecure-requests/support/redirect-cors.py": [
     [
      {}
@@ -326510,16 +326554,6 @@
      {}
     ]
    ],
-   "upgrade-insecure-requests/support/worker.js": [
-    [
-     {}
-    ]
-   ],
-   "upgrade-insecure-requests/support/worker.js.headers": [
-    [
-     {}
-    ]
-   ],
    "url/META.yml": [
     [
      {}
@@ -331954,6 +331988,16 @@
     [
      {}
     ]
+   ],
+   "xhtml/adopt-while-parsing-001-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "xhtml/adopt-while-parsing.xhtml": [
+    [
+     {}
+    ]
    ]
   },
   "testharness": {
@@ -380797,6 +380841,18 @@
      }
     ]
    ],
+   "feature-policy/parameters/feature-parameters-with-frames.html": [
+    [
+     "feature-policy/parameters/feature-parameters-with-frames.html",
+     {}
+    ]
+   ],
+   "feature-policy/parameters/feature-parameters.html": [
+    [
+     "feature-policy/parameters/feature-parameters.html",
+     {}
+    ]
+   ],
    "feature-policy/payment-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html": [
     [
      "feature-policy/payment-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html",
@@ -416046,6 +416102,12 @@
      {}
     ]
    ],
+   "portals/portals-create-orphaned.html": [
+    [
+     "portals/portals-create-orphaned.html",
+     {}
+    ]
+   ],
    "portals/portals-cross-origin-load.sub.html": [
     [
      "portals/portals-cross-origin-load.sub.html",
@@ -485890,7 +485952,7 @@
    "support"
   ],
   "common/security-features/resources/common.js": [
-   "678d2a0d8fa7001e5dcd2204b6f2b548d0b913c1",
+   "8b9bd0d0372a0814a6e5785abc64a26763d35edc",
    "support"
   ],
   "common/security-features/subresource/__init__.py": [
@@ -485914,7 +485976,7 @@
    "support"
   ],
   "common/security-features/subresource/image.py": [
-   "d132889412372e7f764fe98159897fcacc009bbb",
+   "42ebc0767bbea9d3d50f4a3f23c7863748e6908d",
    "support"
   ],
   "common/security-features/subresource/script.py": [
@@ -505870,7 +505932,7 @@
    "testharness"
   ],
   "content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html": [
-   "692db02b6fc5392b08cfcfeb98b88553cb6f72bd",
+   "bf655a2e1b9512065fe19bd0e8f099b70c13eb5c",
    "testharness"
   ],
   "content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html.headers": [
@@ -594141,6 +594203,14 @@
    "3fa9ed51fbb0141534d82e62b0f14fd6cf2efa13",
    "reftest"
   ],
+  "css/css-multicol/multicol-overflow-clip-positioned-ref.html": [
+   "58f1d57bc39beed37d14eea0dc9c1cbc47c33717",
+   "support"
+  ],
+  "css/css-multicol/multicol-overflow-clip-positioned.html": [
+   "184bfc7f18dadbade32192b777c6b21f345882af",
+   "reftest"
+  ],
   "css/css-multicol/multicol-overflowing-001-ref.xht": [
    "d3a6c6e03c58c17f0dfa4f2e6d9b945e352216af",
    "support"
@@ -626446,7 +626516,7 @@
    "testharness"
   ],
   "css/cssom-view/scrollintoview.html": [
-   "c69025b4943accd4c0b34e74dbd7862af2521849",
+   "584ab4b60329d7cd1081edac93a375b7069634ea",
    "testharness"
   ],
   "css/cssom-view/support/1x1-green.png": [
@@ -645722,11 +645792,11 @@
    "support"
   ],
   "feature-policy/experimental-features/lazyload/lazyload-enabled-image-tentative.sub.html": [
-   "e277d9e8ad42307e9ab47038b534f8fc974c492b",
+   "a9e2b295d5034d37c518cf0609590ec3065df70c",
    "testharness"
   ],
   "feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html": [
-   "ebed07bab5abdd15dc95a84eddd03bc4907386be",
+   "3a2f469b25046629113cb2b97df09fa1e56e849e",
    "testharness"
   ],
   "feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html.headers": [
@@ -645997,6 +646067,34 @@
    "33bbe3c14ffe28d961cc4c71c0b367028ff8d2df",
    "testharness"
   ],
+  "feature-policy/parameters/feature-parameters-inf.html": [
+   "db21427c8ed9f3c2f8e8b8ba9d91d4fd230fc2ff",
+   "support"
+  ],
+  "feature-policy/parameters/feature-parameters-inf.html.headers": [
+   "1ec003431b3f090dbb596f6973b84f81de27ace0",
+   "support"
+  ],
+  "feature-policy/parameters/feature-parameters-with-frames.html": [
+   "de0a3ab1e3963e3e7c8da1e6bec35d454b1a9fdb",
+   "testharness"
+  ],
+  "feature-policy/parameters/feature-parameters.html": [
+   "9830f93eb4dcac9aaa2dfe6d209c452df5f94701",
+   "testharness"
+  ],
+  "feature-policy/parameters/feature-parameters.html.headers": [
+   "b4fa805c5696ab5ef8171508aeccf200e9d95df3",
+   "support"
+  ],
+  "feature-policy/parameters/resources/feature-parameters-frame.html": [
+   "4f01f85795da8114e762cb0ddc271cefdd02da1f",
+   "support"
+  ],
+  "feature-policy/parameters/resources/sample-1.png": [
+   "92901925c6082b7fb01fade09f87356308218a47",
+   "support"
+  ],
   "feature-policy/payment-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html": [
    "daa2aa182daed73bd51bf32cf7981a805e3956c8",
    "testharness"
@@ -646410,7 +646508,7 @@
    "support"
   ],
   "feature-policy/resources/featurepolicy.js": [
-   "e2577f35c3fb53abda3934274c3e6a281ba617d9",
+   "744c4c62069508061567d8ac758920beab8e1335",
    "support"
   ],
   "feature-policy/resources/picture-in-picture.js": [
@@ -683037,6 +683135,10 @@
    "63a6d75dc42ef552c237a5c092e3a8c702bd27a8",
    "testharness"
   ],
+  "portals/portals-create-orphaned.html": [
+   "903186ff6c69b12f888286cd8dbca8cbfa0568dc",
+   "testharness"
+  ],
   "portals/portals-cross-origin-load.sub.html": [
    "f860ac54dc9dc6578fa1a66c25da70bc3262d995",
    "testharness"
@@ -683093,6 +683195,10 @@
    "dc161c0e0b82da493aba1cb8fbefb4262b203a48",
    "support"
   ],
+  "portals/resources/portal-create-orphaned.html": [
+   "89b927f649b9db28fdbbb1ed8d023c33203595ce",
+   "support"
+  ],
   "portals/resources/portal-cross-origin.sub.html": [
    "145ab5a2d21295f615d3ecd5d36f9e3034a4202a",
    "support"
@@ -710798,19 +710904,7 @@
    "testharness"
   ],
   "upgrade-insecure-requests/support/generate.py": [
-   "8c8cca21273013693d94ecdae3bc401f08dc1241",
-   "support"
-  ],
-  "upgrade-insecure-requests/support/pass.png": [
-   "2fa1e0ac0663a65deae6602621521cc2844b93de",
-   "support"
-  ],
-  "upgrade-insecure-requests/support/pass.png.headers": [
-   "cb762eff806849df46dc758ef7b98b63f27f54c9",
-   "support"
-  ],
-  "upgrade-insecure-requests/support/post-origin-to-parent.html": [
-   "4f596ef4dce2b8a76e92b4d7a267547ee28c43a7",
+   "4fb7078e7709bd1541df8cc61bbcfa449bc14b37",
    "support"
   ],
   "upgrade-insecure-requests/support/redirect-cors.py": [
@@ -710818,15 +710912,7 @@
    "support"
   ],
   "upgrade-insecure-requests/support/testharness-helper.sub.js": [
-   "70378edd15e6a9423c91ca6d301f4e66e195e998",
-   "support"
-  ],
-  "upgrade-insecure-requests/support/worker.js": [
-   "7e2168bcc06e0dd0832f42c28ef9ba3f7c2d84bf",
-   "support"
-  ],
-  "upgrade-insecure-requests/support/worker.js.headers": [
-   "cb762eff806849df46dc758ef7b98b63f27f54c9",
+   "2c854534d56f5cf3d17660b582156c7f8de4e1cd",
    "support"
   ],
   "upgrade-insecure-requests/websocket-upgrade.https.html": [
@@ -710838,11 +710924,11 @@
    "testharness"
   ],
   "upgrade-insecure-requests/worker-subresource-fetch-redirect-upgrade.https.html": [
-   "b2ce2cfe4043d2d022a775c77244144b4dfdb5d2",
+   "948dd6566c2a1fae7b015c3bf15a4a43fdb3c06d",
    "testharness"
   ],
   "upgrade-insecure-requests/worker-subresource-fetch-upgrade.https.html": [
-   "1639363e898b8faae7cb4fed0014696e6147d8f5",
+   "bc98b9f2d0680047d4808c5c22872246a8496dbb",
    "testharness"
   ],
   "upgrade-insecure-requests/worker-upgrade.https.html": [
@@ -715938,7 +716024,7 @@
    "testharness"
   ],
   "webrtc/RTCDataChannel-id.html": [
-   "4c16547ca780c5285fbb2a264bfaf7b10b43eab6",
+   "0cf01976ff0eeb66c51ded321e777123f063b02c",
    "testharness"
   ],
   "webrtc/RTCDataChannel-send.html": [
@@ -716014,7 +716100,7 @@
    "testharness"
   ],
   "webrtc/RTCPeerConnection-createDataChannel.html": [
-   "ae74b62d42c3de9254c62a6e974e578416fc7c92",
+   "8a13155358de3dab22a77f50172aae5bf0789b43",
    "testharness"
   ],
   "webrtc/RTCPeerConnection-createOffer.html": [
@@ -716054,7 +716140,7 @@
    "testharness"
   ],
   "webrtc/RTCPeerConnection-ondatachannel.html": [
-   "711027439b3ab4b38a18d91a2c9a1eaee7e4b3af",
+   "2fd33ca541148ca6a7be5f5624e303795c7c458d",
    "testharness"
   ],
   "webrtc/RTCPeerConnection-onnegotiationneeded.html": [
@@ -720814,7 +720900,7 @@
    "testharness"
   ],
   "webxr/xrRigidTransform_inverse.https.html": [
-   "ddae2af6469034e67dc579dfd6cfb53b86f28d6a",
+   "e795a99538e27d7a85a75c652b9b972d119e91d6",
    "testharness"
   ],
   "webxr/xrRigidTransform_matrix.https.html": [
@@ -720850,7 +720936,7 @@
    "testharness"
   ],
   "webxr/xrSession_requestAnimationFrame_data_valid.https.html": [
-   "6c567d2fda6888ee0b30e4f4716e75ee4763516d",
+   "2278666a1d7cfc43362b5e09ddf0df25fef42681",
    "testharness"
   ],
   "webxr/xrSession_requestAnimationFrame_getViewerPose.https.html": [
@@ -724272,6 +724358,18 @@
   "xhr/xmlhttprequest-unsent.htm": [
    "eb52d63eef971895f69f1b0151baa457250dd452",
    "testharness"
+  ],
+  "xhtml/adopt-while-parsing-001-ref.html": [
+   "5b512e72f5a1f3780c9c38be79968b095c277a39",
+   "support"
+  ],
+  "xhtml/adopt-while-parsing-001.html": [
+   "74018b4ad0f342aa5b38ad337ce9329e6d92545d",
+   "reftest"
+  ],
+  "xhtml/adopt-while-parsing.xhtml": [
+   "2d85d21558b1778e17376d12424f81c703c0c262",
+   "support"
   ]
  },
  "url_base": "/",
diff --git a/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini b/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
index 2dc6574f235..3ea58427d6a 100644
--- a/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
+++ b/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
@@ -140,12 +140,6 @@
   [Matching font-stretch: '90%' should prefer '50% 80%' over '60% 70%']
     expected: FAIL
 
-  [Matching font-stretch: '90%' should prefer '110% 140%' over '120% 130%']
-    expected: FAIL
-
-  [Matching font-style: 'normal' should prefer 'normal' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-style: 'normal' should prefer 'oblique 0deg' over 'oblique 10deg 40deg']
     expected: FAIL
 
@@ -176,9 +170,6 @@
   [Matching font-style: 'oblique -10deg' should prefer 'oblique -5deg' over 'oblique -1deg 0deg']
     expected: FAIL
 
-  [Matching font-weight: '399' should prefer '350 399' over '340 360']
-    expected: FAIL
-
   [Matching font-weight: '500' should prefer '450 460' over '400']
     expected: FAIL
 
@@ -314,9 +305,6 @@
   [Matching font-style: 'oblique -20deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
     expected: FAIL
 
-  [Matching font-weight: '400' should prefer '450 460' over '500']
-    expected: FAIL
-
   [Matching font-weight: '399' should prefer '450 460' over '500 501']
     expected: FAIL
 
@@ -332,6 +320,3 @@
   [Matching font-stretch: '90%' should prefer '90% 100%' over '50% 80%']
     expected: FAIL
 
-  [Matching font-weight: '400' should prefer '400' over '450 460']
-    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 86bb304a673..18f786d4963 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -163,7 +163,7 @@
     expected: NOTRUN
 
   [<iframe>: combined response Content-Type: text/html;" " text/plain]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Request: combined response Content-Type: text/plain;charset=gbk;x=foo text/plain]
     expected: NOTRUN
@@ -202,7 +202,7 @@
     expected: NOTRUN
 
   [<iframe>: separate response Content-Type: text/html;" " text/plain]
-    expected: TIMEOUT
+    expected: FAIL
 
   [fetch(): separate response Content-Type: text/plain */*;charset=gbk]
     expected: NOTRUN
@@ -312,15 +312,3 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain;charset=gbk text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
-    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 536384f36e1..87c807a49ff 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,3 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20%2Cnosniff]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
new file mode 100644
index 00000000000..78879bad5f1
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
@@ -0,0 +1,5 @@
+[javascript-url-abort-return-value-undefined.tentative.html]
+  expected: TIMEOUT
+  [Not aborting fetch for javascript:undefined navigation]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
rename to tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
index 75d75b4cda2..dc2e45516de 100644
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_2.html]
+[traverse_the_history_5.html]
   [Multiple history traversals, last would be aborted]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
deleted file mode 100644
index 8cc42056d34..00000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ /dev/null
@@ -1,10 +0,0 @@
-[non-active-document.html]
-  [DOMParser]
-    expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini
new file mode 100644
index 00000000000..178680e5d14
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini
@@ -0,0 +1,2 @@
+[script-onerror-insertion-point-2.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index a56bad443a2..66bd350083b 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,5 +1,4 @@
 [realtimeanalyser-fft-scaling.html]
-  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/websockets/Secure-Send-binary-65K-arraybuffer.any.js.ini b/tests/wpt/metadata/websockets/Secure-Send-binary-65K-arraybuffer.any.js.ini
new file mode 100644
index 00000000000..3d710dafa9d
--- /dev/null
+++ b/tests/wpt/metadata/websockets/Secure-Send-binary-65K-arraybuffer.any.js.ini
@@ -0,0 +1,10 @@
+[Secure-Send-binary-65K-arraybuffer.any.html]
+
+[Secure-Send-binary-65K-arraybuffer.any.worker.html]
+  expected: TIMEOUT
+  [Send 65K binary data on a Secure WebSocket - ArrayBuffer - Connection should be closed]
+    expected: NOTRUN
+
+  [Send 65K binary data on a Secure WebSocket - ArrayBuffer - Message should be received]
+    expected: NOTRUN
+
diff --git a/tests/wpt/web-platform-tests/common/security-features/resources/common.js b/tests/wpt/web-platform-tests/common/security-features/resources/common.js
index 678d2a0d8fa..8b9bd0d0372 100644
--- a/tests/wpt/web-platform-tests/common/security-features/resources/common.js
+++ b/tests/wpt/web-platform-tests/common/security-features/resources/common.js
@@ -263,25 +263,43 @@ function extractImageData(img) {
 }
 
 function decodeImageData(rgba) {
-  var rgb = new Uint8ClampedArray(rgba.length);
+  let decodedBytes = new Uint8ClampedArray(rgba.length);
+  let decodedLength = 0;
 
-  // RGBA -> RGB.
-  var rgb_length = 0;
-  for (var i = 0; i < rgba.length; ++i) {
-    // Skip alpha component.
-    if (i % 4 == 3)
-      continue;
+  for (var i = 0; i + 12 <= rgba.length; i += 12) {
+    // A single byte is encoded in three pixels. 8 pixel octets (among
+    // 9 octets = 3 pixels * 3 channels) are used to encode 8 bits,
+    // the most significant bit first, where `0` and `255` in pixel values
+    // represent `0` and `1` in bits, respectively.
+    // This encoding is used to avoid errors due to different color spaces.
+    const bits = [];
+    for (let j = 0; j < 3; ++j) {
+      bits.push(rgba[i + j * 4 + 0]);
+      bits.push(rgba[i + j * 4 + 1]);
+      bits.push(rgba[i + j * 4 + 2]);
+      // rgba[i + j * 4 + 3]: Skip alpha channel.
+    }
+    // The last one element is not used.
+    bits.pop();
+
+    // Decode a single byte.
+    let byte = 0;
+    for (let j = 0; j < 8; ++j) {
+      byte <<= 1;
+      if (bits[j] >= 128)
+        byte |= 1;
+    }
 
     // Zero is the string terminator.
-    if (rgba[i] == 0)
+    if (byte == 0)
       break;
 
-    rgb[rgb_length++] = rgba[i];
+    decodedBytes[decodedLength++] = byte;
   }
 
   // Remove trailing nulls from data.
-  rgb = rgb.subarray(0, rgb_length);
-  var string_data = (new TextDecoder("ascii")).decode(rgb);
+  decodedBytes = decodedBytes.subarray(0, decodedLength);
+  var string_data = (new TextDecoder("ascii")).decode(decodedBytes);
 
   return JSON.parse(string_data);
 }
diff --git a/tests/wpt/web-platform-tests/common/security-features/subresource/image.py b/tests/wpt/web-platform-tests/common/security-features/subresource/image.py
index d1328894123..42ebc0767bb 100644
--- a/tests/wpt/web-platform-tests/common/security-features/subresource/image.py
+++ b/tests/wpt/web-platform-tests/common/security-features/subresource/image.py
@@ -60,20 +60,17 @@ class Image:
 
 def encode_string_as_bmp_image(string_data):
     data_bytes = array.array("B", string_data)
+
     num_bytes = len(data_bytes)
 
-    # Convert data bytes to color data (RGB).
+    # Encode data bytes to color data (RGB), one bit per channel.
+    # This is to avoid errors due to different color spaces used in decoding.
     color_data = []
-    num_components = 3
-    rgb = [0] * num_components
-    i = 0
     for byte in data_bytes:
-        component_index = i % num_components
-        rgb[component_index] = byte
-        if component_index == (num_components - 1) or i == (num_bytes - 1):
-            color_data.append(tuple(rgb))
-            rgb = [0] * num_components
-        i += 1
+        p = [int(x) * 255 for x in '{0:08b}'.format(byte)]
+        color_data.append((p[0], p[1], p[2]))
+        color_data.append((p[3], p[4], p[5]))
+        color_data.append((p[6], p[7], 0))
 
     # Render image.
     num_pixels = len(color_data)
diff --git a/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html b/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html
index 692db02b6fc..bf655a2e1b9 100644
--- a/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html
+++ b/tests/wpt/web-platform-tests/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html
@@ -10,7 +10,7 @@
           if (e.effectiveDirective == effective_directive)
             resolve(e);
         });
-	  });
+      });
     }
 
     async_test(t => {
@@ -70,7 +70,7 @@
 
       window.addEventListener("message", t.step_func(e => {
         if (e.source == i.contentWindow) {
-          if (e.data == (new URL(url)).origin) {
+          if (e.data.location == url) {
             waitForViolation(window, "frame-src")
               .then(t.step_func(e => {
                 reported = true;
@@ -78,7 +78,7 @@
                   t.done();
             }));
             i.contentWindow.location.href = navigate_to;
-          } else if (e.data == (new URL(upgraded)).origin) {
+          } else if (e.data.location == upgraded) {
             loaded = true;
             if (reported)
               t.done();
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned-ref.html
new file mode 100644
index 00000000000..58f1d57bc39
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned-ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<div style="columns: 2">
+  <div style="height: 200px; background: blue"></div>
+  <div style="height: 200px"></div>
+</div>
+
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned.html
new file mode 100644
index 00000000000..184bfc7f18d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS Multi-column Layout Test: multicol with overflow-clipped positioned content</title>
+<link rel="help" href="https://www.w3.org/TR/css-multicol-1/">
+<link rel="match" href="multicol-overflow-clip-positioned-ref.html">
+<meta name="assert" content="Overflow clip for positioned content should work under multicol.">
+<div style="columns: 2">
+  <div style="height: 200px; overflow: hidden">
+    <div style="height: 800px; background: blue; position: relative"></div>
+  </div>
+  <div style="height: 200px"></div>
+</div>
+
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/scrollintoview.html b/tests/wpt/web-platform-tests/css/cssom-view/scrollintoview.html
index c69025b4943..584ab4b6032 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/scrollintoview.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/scrollintoview.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <title>CSSOM View - scrollIntoView</title>
 <meta charset="utf-8">
+<meta name="viewport" content="initial-scale=1">
 <link rel="author" title="Chris Wu" href="mailto:pwx.frontend@gmail.com">
 <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
 <link rel="help" href="https://heycam.github.io/webidl/#es-operations">
diff --git a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-image-tentative.sub.html b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-image-tentative.sub.html
index e277d9e8ad4..a9e2b295d50 100644
--- a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-image-tentative.sub.html
+++ b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-image-tentative.sub.html
@@ -26,7 +26,7 @@ img {
 <body>
   <p>Image inserted further below.</p>
   <div id="image-container">
-    <img id="off" load="eager" src="http://{{hosts[alt][www1]}}:{{ports[http][0]}}/feature-policy/experimental-features/resources/lazyload.png"></img>
+    <img id="off" loading="eager" src="http://{{hosts[alt][www1]}}:{{ports[http][0]}}/feature-policy/experimental-features/resources/lazyload.png"></img>
   </div>
   <script>
     var img = document.querySelector("img");
@@ -35,11 +35,11 @@ img {
       target.load_complete = wait_for_load(target).then(() => target.did_load = true );
     });
 
-    // Sanity-check: Verify that when feature-policy 'lazyload' is enabled, the lazyload attribute
-    // value 'OFF' works as expected (images load immediately).
+    // Sanity-check: Verify that when feature-policy 'lazyload' is enabled, the attribute
+    // loading='eager' works as expected (images load immediately).
     promise_test( async(t) => {
       await window.load_complete;
       assert_true(img.did_load, "Image should have loaded.");
-    }, "When feature is enabled, load=eager works as expected.");
+    }, "When feature is enabled, loading=eager works as expected.");
  </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html
index ebed07bab5a..3a2f469b250 100644
--- a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html
+++ b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/lazyload-enabled-tentative.sub.html
@@ -31,12 +31,12 @@ iframe {
 
   window.scrollTo(0, 0);
 
-  // Sanity-check: Make sure load='lazy' works as intended.
+  // Sanity-check: Make sure loading='lazy' works as intended.
   promise_test(async(t) => {
-    // Add a frame with load="lazy".
+    // Add a frame with loading="lazy".
     let frame_on = createIframe(document.body, {
         id: "ON",
-        load: "lazy",
+        loading: "lazy",
         src: `${cross_origin_url}?id=ON`
       });
     // Sanity-check: The frame is not visible.
@@ -48,17 +48,17 @@ iframe {
         await waitForMessageOrTimeout(t, "ON", load_timeout);
     assert_equals(msg_or_timeout_attr_on,
                   expected_timeout_msg,
-                  "With load='lazy', the frame should not load.");
+                  "With loading='lazy', the frame should not load.");
   }, "Sanity-check: Contents do not load immediately (no eager-loading) " +
-     "when the load attribute is 'lazy' and frame is in viewport.");
+     "when the loading attribute is 'lazy' and frame is in viewport.");
 
   // When feature is enabled, a frame can turn off lazy loading by setting the
   // attribute to 'off'.
   promise_test(async(t) => {
-    // Add a frame with load="eager".
+    // Add a frame with loading="eager".
     let frame_off = createIframe(document.body, {
         id: "OFF",
-        load: "eager",
+        loading: "eager",
         src: `${cross_origin_url}?id=OFF`
       });
     // Sanity-check: The frame is not visible.
@@ -71,7 +71,7 @@ iframe {
 
     assert_equals(msg_or_timeout_attr_off,
                   expected_load_msg,
-                  "With load='eager', the frame should load.");
+                  "With loading='eager', the frame should load.");
   }, "When 'lazyload' feature is enabled, a frame can avoid lazyloading by " +
-     "setting 'load' attribute to 'eager'");
+     "setting 'loading' attribute to 'eager'");
 </script>
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html
new file mode 100644
index 00000000000..db21427c8ed
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test oversized-images policy with threshold 'inf'</title>
+</head>
+<body>
+  <!-- The sample image has an intrinsic image size of 200x200px -->
+  <img src="resources/sample-1.png" width="200" height="200">
+  <img src="resources/sample-1.png" width="100" height="200">
+  <img src="resources/sample-1.png" width="50" height="200">
+  <br>
+  <img src="resources/sample-1.png" width="200" height="100">
+  <img src="resources/sample-1.png" width="100" height="100">
+  <img src="resources/sample-1.png" width="50" height="100">
+  <br>
+  <img src="resources/sample-1.png" width="200" height="50">
+  <img src="resources/sample-1.png" width="100" height="50">
+  <img src="resources/sample-1.png" width="50" height="50">
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html.headers b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html.headers
new file mode 100644
index 00000000000..1ec003431b3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-inf.html.headers
@@ -0,0 +1 @@
+Feature-Policy: oversized-images (inf)
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-with-frames.html b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-with-frames.html
new file mode 100644
index 00000000000..de0a3ab1e39
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters-with-frames.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/feature-policy/resources/featurepolicy.js"></script>
+  <title>Test oversized-images policy with threshold 1.5</title>
+</head>
+<body>
+  <iframe scrolling="no" name="a" style="overflow:hidden" width="380" height="220"></iframe>
+  <iframe scrolling="no" name="b" style="overflow:hidden" width="380" height="220"></iframe>
+  <iframe scrolling="no" name="c" style="overflow:hidden" width="380" height="220"></iframe>
+  <iframe scrolling="no" name="d" style="overflow:hidden" width="380" height="220"></iframe>
+  <iframe scrolling="no" name="e" style="overflow:hidden" width="380" height="220"></iframe>
+
+  <script>
+    const frame_to_test_map = {};
+    window.addEventListener('message', ev => {
+      if (ev.data.type == "finished") {
+        if (frame_to_test_map.hasOwnProperty(ev.data.name)) {
+          frame_to_test_map[ev.data.name].done();
+        }
+      }
+    });
+    const config = {
+      a: {threshold: 0.0, blocked: 3},
+      b: {threshold: 1.0, blocked: 2},
+      c: {threshold: 2.5, blocked: 1},
+      d: {threshold: 4.0, blocked: 0},
+      e: {threshold: "inf", blocked: 0}
+    };
+    const iframes = document.querySelectorAll('iframe');
+    const total_iframes = iframes.length;
+    iframes.forEach(iframe => {
+      const frame_config = config[iframe.name]
+      async_test(t => {
+        frame_to_test_map[iframe.name] = t;
+        iframe.src = "resources/feature-parameters-frame.html?name="+iframe.name+"&n="+frame_config.blocked+"&pipe=header(Feature-Policy,oversized-images%20("+frame_config.threshold+"\\);)";
+      }, "Test frame with threshold " + frame_config.threshold + " should block " + frame_config.blocked + " images.");
+    });
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html
new file mode 100644
index 00000000000..9830f93eb4d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/feature-policy/resources/featurepolicy.js"></script>
+  <title>Test oversized-images policy with threshold 1.5</title>
+</head>
+<body>
+  <!-- The sample image has an intrinsic image size of 200x200px -->
+  <img src="resources/sample-1.png" width="200" height="200">
+  <img src="resources/sample-1.png" width="100" height="200">
+  <img src="resources/sample-1.png" width="50" height="200">
+  <br>
+  <img src="resources/sample-1.png" width="200" height="100">
+  <img src="resources/sample-1.png" width="100" height="100">
+  <img src="resources/sample-1.png" width="50" height="100">
+  <br>
+  <img src="resources/sample-1.png" width="200" height="50">
+  <img src="resources/sample-1.png" width="100" height="50">
+  <img src="resources/sample-1.png" width="50" height="50">
+
+  <script>
+    expect_reports(8, "oversized-images", "8 images should be blocked by policy");
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html.headers b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html.headers
new file mode 100644
index 00000000000..b4fa805c569
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/feature-parameters.html.headers
@@ -0,0 +1 @@
+Feature-Policy: oversized-images (1.5)
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/resources/feature-parameters-frame.html b/tests/wpt/web-platform-tests/feature-policy/parameters/resources/feature-parameters-frame.html
new file mode 100644
index 00000000000..4f01f85795d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/parameters/resources/feature-parameters-frame.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/feature-policy/resources/featurepolicy.js"></script>
+  <title>Test oversized-images policy in subframe</title>
+</head>
+<body>
+  <!-- The sample image has an intrinsic image size of 200x200px -->
+  <img width="200" height="200">
+  <img width="100" height="200">
+  <img width="50" height="200">
+
+  <script>
+    const policy_name = "oversized-images";
+    const params = new URLSearchParams(document.location.search);
+    const frame_name = params.get('name');
+    const expected_report_count = +params.get('n');
+    var num_received_reports = 0;
+
+    const images = document.querySelectorAll('img');
+    const total_images = images.length;
+    var images_loaded = 0;
+
+    const notifyIfDone = () => {
+        if (num_received_reports >= expected_report_count &&
+            images_loaded == total_images) {
+            parent.postMessage({
+                "type": "finished",
+                "name": frame_name
+            },"*");
+        }
+    };
+
+    images.forEach(image => {
+        image.addEventListener('load', () => { images_loaded++; notifyIfDone(); });
+        image.src = "sample-1.png";
+    });
+
+    new ReportingObserver((reports, observer) => {
+        const relevant_reports = reports.filter(r => (r.body.featureId === policy_name));
+        num_received_reports += relevant_reports.length;
+        notifyIfDone();
+    }, {types: ['feature-policy-violation'], buffered: true}).observe();
+  </script>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/feature-policy/parameters/resources/sample-1.png b/tests/wpt/web-platform-tests/feature-policy/parameters/resources/sample-1.png
new file mode 100644
index 00000000000..92901925c60
Binary files /dev/null and b/tests/wpt/web-platform-tests/feature-policy/parameters/resources/sample-1.png differ
diff --git a/tests/wpt/web-platform-tests/feature-policy/resources/featurepolicy.js b/tests/wpt/web-platform-tests/feature-policy/resources/featurepolicy.js
index e2577f35c3f..744c4c62069 100644
--- a/tests/wpt/web-platform-tests/feature-policy/resources/featurepolicy.js
+++ b/tests/wpt/web-platform-tests/feature-policy/resources/featurepolicy.js
@@ -433,3 +433,16 @@ function test_frame_policy(
     assert_false(frame_policy.allowedFeatures().includes(feature));
   }
 }
+
+function expect_reports(report_count, policy_name, description) {
+  async_test(t => {
+    var num_received_reports = 0;
+    new ReportingObserver(t.step_func((reports, observer) => {
+        const relevant_reports = reports.filter(r => (r.body.featureId === policy_name));
+        num_received_reports += relevant_reports.length;
+        if (num_received_reports >= report_count) {
+            t.done();
+        }
+   }), {types: ['feature-policy-violation'], buffered: true}).observe();
+  }, description);
+}
diff --git a/tests/wpt/web-platform-tests/portals/portals-create-orphaned.html b/tests/wpt/web-platform-tests/portals/portals-create-orphaned.html
new file mode 100644
index 00000000000..903186ff6c6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portals-create-orphaned.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+  <script>
+    promise_test(async () => {
+      let waitForMessage = new Promise((resolve, reject) => {
+        var bc = new BroadcastChannel("portals-create-orphaned");
+        bc.onmessage = e => {
+          bc.close();
+          resolve(e.data);
+        }
+      });
+      window.open("resources/portal-create-orphaned.html");
+      let message = await waitForMessage;
+      assert_equals(message, "portal loaded");
+    }, "creating a portal from an orphaned portal should succeed");
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-create-orphaned.html b/tests/wpt/web-platform-tests/portals/resources/portal-create-orphaned.html
new file mode 100644
index 00000000000..89b927f649b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-create-orphaned.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    var portal = document.createElement("portal");
+    portal.src = "simple-portal.html";
+    let waitForMessage = new Promise((resolve, reject) => {
+      var bc_portal = new BroadcastChannel("simple-portal");
+      bc_portal.onmessage = e => {
+        bc_portal.close();
+        portal.activate();
+        var portal2 = document.createElement("portal");
+        portal2.src = "simple-portal.html";
+        document.body.appendChild(portal2);
+        var bc2 = new BroadcastChannel("simple-portal");
+        bc2.onmessage = e => {
+          bc2.close();
+          resolve("portal loaded");
+        }
+      }
+    });
+    document.body.appendChild(portal);
+    waitForMessage.then(message => {
+      var bc = new BroadcastChannel("portals-create-orphaned");
+      bc.postMessage(message);
+      bc.close();
+    });
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/generate.py b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/generate.py
index 8c8cca21273..4fb7078e770 100644
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/generate.py
+++ b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/generate.py
@@ -33,8 +33,8 @@ for name, resourceType in [
   ('layout-worklet', 'WORKLET'), ('paint-worklet', 'WORKLET'),
   ('worker', 'WORKER'),
   ('module-worker', 'WORKER'),
-  ('worker-subresource-xhr', 'IMAGE'),
-  ('worker-subresource-fetch', 'IMAGE')]:
+  ('worker-subresource-xhr', 'FETCH'),
+  ('worker-subresource-fetch', 'FETCH')]:
   sameOriginOnly = 'true' if resourceType == 'WORKER' else 'false'
   types = [('', 'generateTests'), ('-redirect', 'generateRedirectTests')]
   if name == 'module-worker' or resourceType == 'WORKLET':
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png
deleted file mode 100644
index 2fa1e0ac066..00000000000
Binary files a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png and /dev/null differ
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png.headers b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png.headers
deleted file mode 100644
index cb762eff806..00000000000
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/pass.png.headers
+++ /dev/null
@@ -1 +0,0 @@
-Access-Control-Allow-Origin: *
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/post-origin-to-parent.html b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/post-origin-to-parent.html
deleted file mode 100644
index 4f596ef4dce..00000000000
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/post-origin-to-parent.html
+++ /dev/null
@@ -1,3 +0,0 @@
-<script>
-  parent.postMessage(window.location.origin, '*');
-</script>
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/testharness-helper.sub.js b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/testharness-helper.sub.js
index 70378edd15e..2c854534d56 100644
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/testharness-helper.sub.js
+++ b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/testharness-helper.sub.js
@@ -20,6 +20,7 @@ const ResourceType = {
   WORKER: "worker",
   WORKLET: "worklet",
   WEBSOCKET: "websocket",
+  FETCH: "fetch",
 };
 
 // These tests rely on some unintuitive cleverness due to WPT's test setup:
@@ -27,22 +28,24 @@ const ResourceType = {
 // in the form `http://[domain]:[https-port]`. If the upgrade fails, the load will fail,
 // as we don't serve HTTP over the secure port.
 function generateURL(host, protocol, resourceType) {
-  var url = new URL("http://{{host}}:{{ports[https][0]}}/upgrade-insecure-requests/support/");
+  var url = new URL("http://{{host}}:{{ports[https][0]}}/common/security-features/subresource/");
   url.protocol = protocol == Protocol.INSECURE ? "http" : "https";
   url.hostname = host == Host.SAME_ORIGIN ? "{{host}}" : "{{domains[天気の良い日]}}";
 
   if (resourceType == ResourceType.IMAGE) {
-    url.pathname += "pass.png";
+    url.pathname += "image.py";
   } else if (resourceType == ResourceType.FRAME) {
-    url.pathname += "post-origin-to-parent.html";
+    url.pathname += "document.py";
   } else if (resourceType == ResourceType.WEBSOCKET) {
     url.port = {{ports[wss][0]}};
     url.protocol = protocol == Protocol.INSECURE ? "ws" : "wss";
     url.pathname = "echo";
   } else if (resourceType == ResourceType.WORKER) {
-    url.pathname += "worker.js";
+    url.pathname += "worker.py";
   } else if (resourceType == ResourceType.WORKLET) {
-    url.pathname = "/worklets/resources/empty-worklet-script-with-cors-header.js";
+    url.pathname += "worker.py";
+  } else if (resourceType == ResourceType.FETCH) {
+    url.pathname += "xhr.py";
   }
   return {
     name: protocol + "/" + host + " "  + resourceType,
@@ -110,24 +113,24 @@ function generateModuleImportTests(target, sameOriginOnly) {
   return tests;
 }
 
-function assert_image_loads(test, url, height, width) {
+function assert_image_loads(test, url) {
   var i = document.createElement('img');
   i.onload = test.step_func_done(_ => {
-    assert_equals(i.naturalHeight, height, "Height.");
-    assert_equals(i.naturalWidth, width, "Width.");
+    assert_greater_than(i.naturalHeight, 0, "Height.");
+    assert_greater_than(i.naturalWidth, 0, "Width.");
   });
   i.onerror = test.unreached_func(url + " should load successfully.");
   i.src = url;
 }
 
-function assert_image_loads_in_srcdoc(test, url, height, width) {
+function assert_image_loads_in_srcdoc(test, url) {
   var frame = document.createElement('iframe');
   frame.srcdoc = "yay!";
   frame.onload = _ => {
     var i = frame.contentDocument.createElement('img');
     i.onload = test.step_func_done(_ => {
-      assert_equals(i.naturalHeight, height, "Height.");
-      assert_equals(i.naturalWidth, width, "Width.");
+      assert_greater_than(i.naturalHeight, 0, "Height.");
+      assert_greater_than(i.naturalWidth, 0, "Width.");
       frame.remove();
     });
     i.onerror = test.unreached_func(url + " should load successfully.");
@@ -137,13 +140,13 @@ function assert_image_loads_in_srcdoc(test, url, height, width) {
   document.body.appendChild(frame);
 }
 
-function assert_image_loads_in_blank(test, url, height, width) {
+function assert_image_loads_in_blank(test, url) {
   var frame = document.createElement('iframe');
   frame.onload = _ => {
     var i = frame.contentDocument.createElement('img');
     i.onload = test.step_func_done(_ => {
-      assert_equals(i.naturalHeight, height, "Height.");
-      assert_equals(i.naturalWidth, width, "Width.");
+      assert_greater_than(i.naturalHeight, 0, "Height.");
+      assert_greater_than(i.naturalWidth, 0, "Width.");
       frame.remove();
     });
     i.onerror = test.unreached_func(url + " should load successfully.");
@@ -153,20 +156,6 @@ function assert_image_loads_in_blank(test, url, height, width) {
   document.body.appendChild(frame);
 }
 
-function assert_frame_loads(test, url) {
-  var i = document.createElement('iframe');
-
-  window.addEventListener('message', test.step_func(e => {
-    if (e.source == i.contentWindow) {
-      i.remove();
-      test.done();
-    }
-  }));
-
-  i.src = url;
-  document.body.appendChild(i);
-}
-
 function assert_websocket_loads(test, url) {
   var w = new WebSocket(url, "echo");
   w.onopen = test.step_func(_ => {
@@ -178,12 +167,12 @@ function assert_websocket_loads(test, url) {
 
 const testMap = {
   "image": test => {
-    async_test(t => assert_image_loads(t, test.url, 64, 168), test.name);
-    async_test(t => assert_image_loads_in_srcdoc(t, test.url, 64, 168), test.name + " in <iframe srcdoc>");
-    async_test(t => assert_image_loads_in_blank(t, test.url, 64, 168), test.name + " in <iframe>");
+    async_test(t => assert_image_loads(t, test.url), test.name);
+    async_test(t => assert_image_loads_in_srcdoc(t, test.url), test.name + " in <iframe srcdoc>");
+    async_test(t => assert_image_loads_in_blank(t, test.url), test.name + " in <iframe>");
   },
   "iframe":
-    test => async_test(t => assert_frame_loads(t, test.url), test.name),
+    test => promise_test(t => requestViaIframe(test.url), test.name),
 
   "worker":
     test => promise_test(
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js
deleted file mode 100644
index 7e2168bcc06..00000000000
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js
+++ /dev/null
@@ -1 +0,0 @@
-postMessage('done');
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js.headers b/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js.headers
deleted file mode 100644
index cb762eff806..00000000000
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/support/worker.js.headers
+++ /dev/null
@@ -1 +0,0 @@
-Access-Control-Allow-Origin: *
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-redirect-upgrade.https.html b/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-redirect-upgrade.https.html
index b2ce2cfe404..948dd6566c2 100644
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-redirect-upgrade.https.html
+++ b/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-redirect-upgrade.https.html
@@ -12,7 +12,7 @@
 </head>
 <body>
 <script>
-const tests = generateRedirectTests(ResourceType.IMAGE, false);
+const tests = generateRedirectTests(ResourceType.FETCH, false);
 tests.forEach(test => testMap['worker-subresource-fetch'](test));
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-upgrade.https.html b/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-upgrade.https.html
index 1639363e898..bc98b9f2d06 100644
--- a/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-upgrade.https.html
+++ b/tests/wpt/web-platform-tests/upgrade-insecure-requests/worker-subresource-fetch-upgrade.https.html
@@ -12,7 +12,7 @@
 </head>
 <body>
 <script>
-const tests = generateTests(ResourceType.IMAGE, false);
+const tests = generateTests(ResourceType.FETCH, false);
 tests.forEach(test => testMap['worker-subresource-fetch'](test));
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCDataChannel-id.html b/tests/wpt/web-platform-tests/webrtc/RTCDataChannel-id.html
index 4c16547ca78..0cf01976ff0 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCDataChannel-id.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCDataChannel-id.html
@@ -82,11 +82,10 @@ promise_test(async (t) => {
 }, 'DTLS server uses even data channel IDs');
 
 /*
-  Check if the implementation allows using in-band negotiated channels with a specific ID (which
-  is now a spec violation).
+  Checks that the id is ignored if "negotiated" is false.
+  See section 6.1, createDataChannel step 13.
  */
 promise_test(async (t) => {
-  const resolver = new Resolver();
   const pc1 = new RTCPeerConnection();
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
@@ -104,17 +103,18 @@ promise_test(async (t) => {
     negotiated: false,
     id: 42
   });
-  dc2.onmessage = t.step_func(() => {
-    assert_unreached('Channel established with same ID using negotiated=false');
-  });
+  // ID should be null prior to negotiation.
+  assert_equals(dc1.id, null);
+  assert_equals(dc2.id, null);
 
   exchangeIceCandidates(pc1, pc2);
   await doSignalingHandshake(pc1, pc2);
-
-  // Wait a bit to ensure the 'message' event does NOT fire
-  t.step_timeout(() => resolver.resolve(), 500);
-  await resolver;
-}, 'In-band negotiation with a specific ID should not be allowed');
+  // We should now have 2 datachannels with different IDs.
+  // At least one of the datachannels should not be 42.
+  // If one has the value 42, it's an accident; if both have,
+  // they are the same datachannel, and it's a bug.
+  assert_false(dc1.id == 42 && dc2.id == 42);
+}, 'In-band negotiation with a specific ID should not work');
 
 /*
   Check if the implementation still follows the odd/even role correctly if we annoy it with
@@ -149,7 +149,7 @@ promise_test(async (t) => {
       negotiated: true,
       id: id,
     });
-    assert_equals(dc.id, null, 'Channel id must be null before DTLS role has been determined');
+    assert_equals(dc.id, id, 'Channel id must be set before DTLS role has been determined when negotiated is true');
     negotiatedDcs.push([dc, id]);
     ids.add(dc.id, `Channel ID ${dc.id} should be unique`);
   }
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-createDataChannel.html b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-createDataChannel.html
index ae74b62d42c..8a13155358d 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-createDataChannel.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-createDataChannel.html
@@ -60,7 +60,7 @@
     };
  */
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -72,7 +72,7 @@ test((t) => {
   6.2.  createDataChannel
     2.  If connection's [[isClosed]] slot is true, throw an InvalidStateError.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   pc.close();
   assert_equals(pc.signalingState, 'closed', 'signaling state');
@@ -128,7 +128,7 @@ test((t) => {
       [...] When a RTCDataChannel object is created, the binaryType attribute MUST
       be initialized to the string "blob".
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -151,14 +151,14 @@ test((t) => {
   assert_equals(dc.binaryType, 'blob');
 }, 'createDataChannel attribute default values');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
   const dc = pc.createDataChannel('test', {
     ordered: false,
-    maxPacketLifeTime: null,
     maxRetransmits: 1,
+    // Note: maxPacketLifeTime is not set in this test.
     protocol: 'custom',
     negotiated: true,
     id: 3,
@@ -178,6 +178,14 @@ test((t) => {
   assert_equals(dc.bufferedAmount, 0);
   assert_equals(dc.bufferedAmountLowThreshold, 0);
   assert_equals(dc.binaryType, 'blob');
+
+  const dc2 = pc.createDataChannel('test2', {
+    ordered: false,
+    maxPacketLifeTime: 42
+  });
+  assert_equals(dc2.label, 'test2');
+  assert_equals(dc2.maxPacketLifeTime, 42);
+  assert_equals(dc.maxRetransmits, null);
 }, 'createDataChannel with provided parameters should initialize attributes to provided values');
 
 /*
@@ -198,7 +206,7 @@ const labels = [
   ['lone surrogate', '\uD800', '\uFFFD'],
 ];
 for (const [description, label, expected] of labels) {
-  test((t) => {
+  test(t => {
     const pc = new RTCPeerConnection;
     t.add_cleanup(() => pc.close());
 
@@ -213,7 +221,7 @@ for (const [description, label, expected] of labels) {
       11. Let channel have an [[Ordered]] internal slot initialized to option's
           ordered member.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -223,7 +231,7 @@ test((t) => {
 
 // true as the default value of a boolean is confusing because null is converted
 // to false while undefined is converted to true.
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -239,7 +247,7 @@ test((t) => {
       7.  Let channel have an [[MaxPacketLifeTime]] internal slot initialized to
           option's maxPacketLifeTime member, if present, otherwise null.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
@@ -253,7 +261,7 @@ test((t) => {
       10. Let channel have an [[MaxRetransmits]] internal slot initialized to
           option's maxRetransmits member, if present, otherwise null.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
@@ -266,17 +274,17 @@ test((t) => {
     18. If both [[MaxPacketLifeTime]] and [[MaxRetransmits]] attributes are set (not null),
         throw a TypeError.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
   pc.createDataChannel('', {
-    maxPacketLifeTime: null,
-    maxRetransmits: null
+    maxPacketLifeTime: undefined,
+    maxRetransmits: undefined
   });
-}, 'createDataChannel with both maxPacketLifeTime and maxRetransmits null should succeed');
+}, 'createDataChannel with both maxPacketLifeTime and maxRetransmits undefined should succeed');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
@@ -303,7 +311,7 @@ const protocols = [
   ['lone surrogate', '\uD800', '\uFFFD'],
 ];
 for (const [description, protocol, expected] of protocols) {
-  test((t) => {
+  test(t => {
     const pc = new RTCPeerConnection;
     t.add_cleanup(() => pc.close());
 
@@ -319,21 +327,22 @@ for (const [description, protocol, expected] of protocols) {
           ID of 65534 but still qualifies as an unsigned short, throw a TypeError.
  */
 for (const id of [0, 1, 65534]) {
-  test((t) => {
+  test(t => {
     const pc = new RTCPeerConnection();
     t.add_cleanup(() => pc.close());
 
-    const dc = pc.createDataChannel('', { id });
+    const dc = pc.createDataChannel('', { 'negotiated': true, 'id': id });
     assert_equals(dc.id, id);
   }, `createDataChannel with id ${id} should succeed`);
 }
 
 for (const id of [-1, 65535, 65536]) {
-  test((t) => {
+  test(t => {
     const pc = new RTCPeerConnection();
     t.add_cleanup(() => pc.close());
 
-    assert_throws(new TypeError(), () => pc.createDataChannel('', { id }));
+    assert_throws(new TypeError(), () => pc.createDataChannel('',
+        { 'negotiated': true, 'id': id }));
   }, `createDataChannel with id ${id} should throw TypeError`);
 }
 
@@ -343,7 +352,7 @@ for (const id of [-1, 65535, 65536]) {
       17. Let channel have an [[DataChannelPriority]] internal slot initialized to option's
           priority member.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -351,7 +360,7 @@ test((t) => {
   assert_equals(dc.priority, 'high');
 }, 'createDataChannel with priority "high" should succeed');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -363,7 +372,7 @@ test((t) => {
   6.2.  createDataChannel
     5.  If [[DataChannelLabel]] is longer than 65535 bytes, throw a TypeError.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -377,7 +386,7 @@ test((t) => {
     }));
 }, 'createDataChannel with too long label should throw TypeError');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -411,13 +420,14 @@ test(t => {
     13. If [[DataChannelProtocol]] is longer than 65535 bytes long, throw a TypeError.
  */
 
-test(() => {
+test(t => {
   const pc = new RTCPeerConnection;
-  const channel = pc.createDataChannel('', { negotiated: true });
+  t.add_cleanup(() => pc.close());
+  const channel = pc.createDataChannel('', { negotiated: true, id: 42 });
   assert_equals(channel.negotiated, true);
-}, 'createDataChannel with negotiated true should succeed');
+}, 'createDataChannel with negotiated true and id should succeed');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -434,7 +444,7 @@ test((t) => {
     }));
 }, 'createDataChannel with too long protocol should throw TypeError');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -451,7 +461,7 @@ test((t) => {
     }));
 }, 'createDataChannel with too long protocol (2 byte unicode) should throw TypeError');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -476,7 +486,7 @@ test((t) => {
         is intentional. Data channels negotiated in-band should have IDs selected based on the
         DTLS role, as specified in [RTCWEB-DATA-PROTOCOL].
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
@@ -486,7 +496,7 @@ test((t) => {
   assert_equals(dc.negotiated, false, 'Expect dc.negotiated to be false');
 }, 'createDataChannel with negotiated false should succeed');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection;
   t.add_cleanup(() => pc.close());
 
@@ -502,7 +512,7 @@ test((t) => {
   6.2.  createDataChannel
     16. If [[Negotiated]] is true and [[DataChannelId]] is null, throw a TypeError.
  */
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -512,17 +522,6 @@ test((t) => {
     }));
 }, 'createDataChannel with negotiated true and id not defined should throw TypeError');
 
-test((t) => {
-  const pc = new RTCPeerConnection();
-  t.add_cleanup(() => pc.close());
-
-  assert_throws(new TypeError(), () =>
-    pc.createDataChannel('test', {
-      negotiated: true,
-      id: null
-    }));
-}, 'createDataChannel with negotiated true and id null should throw TypeError');
-
 /*
   4.4.1.6.  Set the RTCSessionSessionDescription
     2.2.6.  If description is of type "answer" or "pranswer", then run the
@@ -544,7 +543,7 @@ test((t) => {
         If the [[DataChannelId]] slot is null after this step, it will be populated once
         the DTLS role is determined during the process of setting an RTCSessionDescription.
  */
-promise_test(async (t) => {
+promise_test(async t => {
   const pc1 = new RTCPeerConnection();
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
@@ -597,7 +596,7 @@ promise_test(async (t) => {
     'Expect negotiatedDc.id to be 42 after remote description has been set');
 }, 'Channels created (after setRemoteDescription) should have id assigned');
 
-test((t) => {
+test(t => {
   const pc = new RTCPeerConnection();
   t.add_cleanup(() => pc.close());
 
@@ -625,7 +624,7 @@ test((t) => {
 
 // We've seen implementations behaving differently before and after the connection has been
 // established.
-promise_test(async (t) => {
+promise_test(async t => {
   const pc1 = new RTCPeerConnection();
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
@@ -660,7 +659,7 @@ promise_test(async (t) => {
 }, 'Reusing a data channel id that is in use (after setRemoteDescription) should throw ' +
    'OperationError');
 
-promise_test(async (t) => {
+promise_test(async t => {
   const pc1 = new RTCPeerConnection();
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
@@ -685,7 +684,7 @@ promise_test(async (t) => {
   'should throw OperationError');
 
 // Based on https://bugzilla.mozilla.org/show_bug.cgi?id=1441723
-promise_test(async (t) => {
+promise_test(async t => {
   const pc1 = new RTCPeerConnection();
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc1.close());
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-ondatachannel.html b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-ondatachannel.html
index 711027439b3..2fd33ca5411 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-ondatachannel.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-ondatachannel.html
@@ -355,7 +355,8 @@ promise_test(async (t) => {
   pc2.ondatachannel = t.unreached_func('datachannel event should not be fired');
 
   pc1.createDataChannel('test', {
-    negotiated: true
+    negotiated: true,
+    id: 42
   });
 
   exchangeIceCandidates(pc1, pc2);
diff --git a/tests/wpt/web-platform-tests/webxr/xrRigidTransform_inverse.https.html b/tests/wpt/web-platform-tests/webxr/xrRigidTransform_inverse.https.html
index ddae2af6469..e795a99538e 100644
--- a/tests/wpt/web-platform-tests/webxr/xrRigidTransform_inverse.https.html
+++ b/tests/wpt/web-platform-tests/webxr/xrRigidTransform_inverse.https.html
@@ -29,14 +29,14 @@ let testFunction =
   // An identity transform should be equal to it's inverse.
   let identity_transform = new XRRigidTransform();
   t.step(() => {
-    assert_transform_approx_equals(identity_transform, identity_transform.inverse());
+    assert_transform_approx_equals(identity_transform, identity_transform.inverse);
   });
 
   // Inversed transforms should yield the expected results
   let transform = new XRRigidTransform(
       { x: 1.0, y: 2.0, z: 3.0 },
       { x: 0.0, y: 0.0, z: 0.0, w: 1.0 });
-  let inverse_transform = transform.inverse();
+  let inverse_transform = transform.inverse;
   let expected_inverse = new XRRigidTransform(
       { x: -1.0, y: -2.0, z: -3.0 },
       { x: 0.0, y: 0.0, z: 0.0, w: 1.0 });
@@ -47,7 +47,7 @@ let testFunction =
   transform = new XRRigidTransform(
       { x: 0.0, y: 0.0, z: 0.0 },
       { x: 1.0, y: 0.0, z: 0.0, w: 1.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   expected_inverse = new XRRigidTransform(
       { x: 0.0, y: 0.0, z: 0.0 },
       { x: -1.0, y: 0.0, z: 0.0, w: 1.0 });
@@ -58,7 +58,7 @@ let testFunction =
   transform = new XRRigidTransform(
       { x: 1.0, y: 2.0, z: 3.0 },
       { x: 0.0, y: 1.0, z: 0.0, w: 1.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   expected_inverse = new XRRigidTransform(
       { x: 3.0, y: -2.0, z: -1.0 },
       { x: 0.0, y: -1.0, z: 0.0, w: 1.0 });
@@ -70,33 +70,33 @@ let testFunction =
   transform = new XRRigidTransform(
       { x: 1.0, y: 2.0, z: 3.0 },
       { x: 1.0, y: 2.0, z: 3.0, w: 4.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   t.step(() => {
-    assert_transform_approx_equals(transform, inverse_transform.inverse());
+    assert_transform_approx_equals(transform, inverse_transform.inverse);
   });
 
   transform = new XRRigidTransform(
       { x: -9.0, y: 8.0, z: -7.0 },
       { x: 6.0, y: -5.0, z: 4.0, w: 3.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   t.step(() => {
-    assert_transform_approx_equals(transform, inverse_transform.inverse());
+    assert_transform_approx_equals(transform, inverse_transform.inverse);
   });
 
   transform = new XRRigidTransform(
       { x: -2.0, y: 1.0, z: -4.0 },
       { x: 0.0, y: 1.0, z: 0.0, w: 1.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   t.step(() => {
-    assert_transform_approx_equals(transform, inverse_transform.inverse());
+    assert_transform_approx_equals(transform, inverse_transform.inverse);
   });
 
   transform = new XRRigidTransform(
       { x: 2.0, y: -1.0, z: 4.0 },
       { x: 1.0, y: 0.0, z: 0.0, w: 1.0 });
-  inverse_transform = transform.inverse();
+  inverse_transform = transform.inverse;
   t.step(() => {
-    assert_transform_approx_equals(transform, inverse_transform.inverse());
+    assert_transform_approx_equals(transform, inverse_transform.inverse);
   });
 
   resolve();
diff --git a/tests/wpt/web-platform-tests/webxr/xrSession_requestAnimationFrame_data_valid.https.html b/tests/wpt/web-platform-tests/webxr/xrSession_requestAnimationFrame_data_valid.https.html
index 6c567d2fda6..2278666a1d7 100644
--- a/tests/wpt/web-platform-tests/webxr/xrSession_requestAnimationFrame_data_valid.https.html
+++ b/tests/wpt/web-platform-tests/webxr/xrSession_requestAnimationFrame_data_valid.https.html
@@ -36,7 +36,7 @@
       assert_not_equals(view, null);
       assert_not_equals(view.transform, null);
 
-      let inv_view_transform = view.transform.inverse();
+      let inv_view_transform = view.transform.inverse;
       assert_not_equals(inv_view_transform, null);
       assert_not_equals(inv_view_transform.matrix, null);
       assert_equals(inv_view_transform.matrix.length, 16);
diff --git a/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001-ref.html b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001-ref.html
new file mode 100644
index 00000000000..5b512e72f5a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001-ref.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<title>Test reference</title>
+<style>
+  html, body { margin: 0 }
+</style>
+<iframe src="about:blank"></iframe>
+<div>
+  PASS
+</div>
diff --git a/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001.html b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001.html
new file mode 100644
index 00000000000..74018b4ad0f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing-001.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>Appending from the parser after adopting in an XML document doesn't miss notifications</title>
+<link rel="match" href="adopt-while-parsing-001-ref.html">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1511329">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<style>
+  html, body { margin: 0 }
+</style>
+<script>
+  // If we don't get notified of the <div> insertion, the PASS text will never appear.
+  function parsingInterrupted() {
+    let frameDoc = document.querySelector("iframe").contentDocument;
+    let root = frameDoc.documentElement;
+    document.documentElement.appendChild(root);
+    root.offsetTop;
+  }
+</script>
+<iframe src="adopt-while-parsing.xhtml"></iframe>
diff --git a/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing.xhtml b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing.xhtml
new file mode 100644
index 00000000000..2d85d21558b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/xhtml/adopt-while-parsing.xhtml
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<body>
+  <script>
+    window.parent.parsingInterrupted();
+  </script>
+  <div>
+    PASS
+  </div>
+</body>
+</html>