diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 1a16a86c8eb..74d2bf41c0d 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -13537,6 +13537,24 @@
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+   "payment-request/payment-request-abort-method-manual.https.html": [
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+     {}
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+   "payment-request/payment-request-multiple-show-manual.https.html": [
+    [
+     "/payment-request/payment-request-multiple-show-manual.https.html",
+     {}
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+   "payment-request/payment-request-show-method-manual.https.html": [
+    [
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+     {}
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    "payment-request/payment-response/complete-method-manual.https.html": [
     [
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@@ -19377,6 +19395,30 @@
      {}
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+   "animation-worklet/worklet-animation-local-time-after-duration.https.html": [
+    [
+     "/animation-worklet/worklet-animation-local-time-after-duration.https.html",
+     [
+      [
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+       "=="
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+    ]
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+   "animation-worklet/worklet-animation-local-time-before-start.https.html": [
+    [
+     "/animation-worklet/worklet-animation-local-time-before-start.https.html",
+     [
+      [
+       "/animation-worklet/worklet-animation-local-time-before-start-ref.html",
+       "=="
+      ]
+     ],
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+    ]
+   ],
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     [
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@@ -103753,6 +103795,30 @@
      {}
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+   "css/css-align/baseline-of-scrollable-1a.html": [
+    [
+     "/css/css-align/baseline-of-scrollable-1a.html",
+     [
+      [
+       "/css/css-align/reference/baseline-of-scrollable-1-ref.html",
+       "=="
+      ]
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+     {}
+    ]
+   ],
+   "css/css-align/baseline-of-scrollable-1b.html": [
+    [
+     "/css/css-align/baseline-of-scrollable-1b.html",
+     [
+      [
+       "/css/css-align/reference/baseline-of-scrollable-1-ref.html",
+       "=="
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+   ],
    "css/css-align/content-distribution/place-content-shorthand-007.html": [
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@@ -127929,6 +127995,30 @@
      {}
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+   "css/css-masking/clip/clip-transform-order-2.html": [
+    [
+     "/css/css-masking/clip/clip-transform-order-2.html",
+     [
+      [
+       "/css/css-masking/clip/clip-filter-order-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-masking/clip/clip-transform-order.html": [
+    [
+     "/css/css-masking/clip/clip-transform-order.html",
+     [
+      [
+       "/css/css-masking/clip/clip-filter-order-ref.html",
+       "=="
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@@ -162577,6 +162667,18 @@
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+   "css/css-writing-modes/baseline-with-orthogonal-flow-001.html": [
+    [
+     "/css/css-writing-modes/baseline-with-orthogonal-flow-001.html",
+     [
+      [
+       "/css/css-writing-modes/reference/baseline-with-orthogonal-flow-001-ref.html",
+       "=="
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+     {}
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@@ -170745,6 +170847,18 @@
      {}
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+   "css/cssom-view/long_scroll_composited.html": [
+    [
+     "/css/cssom-view/long_scroll_composited.html",
+     [
+      [
+       "/css/cssom-view/long_scroll_composited-ref.html",
+       "=="
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+     ],
+     {}
+    ]
+   ],
    "css/cssom-view/offsetTopLeftInline.html": [
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@@ -170877,18 +170991,6 @@
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@@ -178101,6 +178203,30 @@
      {}
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+   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007.html": [
+    [
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+     [
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+       "=="
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+   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007v.html": [
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+     [
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+       "=="
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@@ -202513,6 +202639,16 @@
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+   "animation-worklet/worklet-animation-local-time-before-start-ref.html": [
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    "annotation-model/.editorconfig": [
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@@ -253348,6 +253484,11 @@
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    "css/css-align/reference/ttwf-reftest-alignContent-ref.html": [
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@@ -277278,6 +277419,11 @@
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+   "css/css-writing-modes/reference/baseline-with-orthogonal-flow-001-ref.html": [
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    "css/css-writing-modes/reference/bidi-embed-001.html": [
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@@ -279508,6 +279654,11 @@
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    "css/cssom-view/resources/elementsFromPoint.js": [
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@@ -283043,6 +283189,11 @@
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+   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007-ref.html": [
+    [
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+   ],
    "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-items-as-stacking-contexts-001-ref.xhtml": [
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@@ -286983,6 +287134,11 @@
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+   "element-timing/resources/TAOImage.py": [
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@@ -302408,6 +302564,11 @@
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@@ -322788,11 +322949,6 @@
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@@ -359117,15 +359273,21 @@
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@@ -374253,18 +374415,6 @@
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@@ -384897,6 +385047,12 @@
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@@ -384999,13 +385155,9 @@
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+     "/longtask-timing/supported-longtask-types.window.html",
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@@ -389005,13 +389157,9 @@
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-     {}
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+     "/navigation-timing/supported_navigation_type.window.html",
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@@ -398961,13 +399109,9 @@
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+     "/paint-timing/supported-paint-type.window.html",
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@@ -399326,9 +399470,7 @@
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-     {
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-     }
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    "payment-request/payment-response/onpayerdetailchange-attribute.https.html": [
@@ -413887,6 +414029,30 @@
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@@ -418907,6 +419073,18 @@
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@@ -456488,6 +456666,22 @@
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@@ -542684,6 +542878,14 @@
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@@ -542916,6 +543118,10 @@
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+   "reftest"
+  ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-items-as-stacking-contexts-001-ref.xhtml": [
    "7e02b799f0f75b5d238ecc3c7bbaf87a53572e88",
    "support"
@@ -607137,7 +607371,7 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/reftest.list": [
-   "5bb3b650139c3293cb7d782d47af7dbff9bc3ad6",
+   "850651a9f6ec839261e95261b5bd2fdffae6f4a8",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/support/Ahem.ttf": [
@@ -614889,7 +615123,7 @@
    "support"
   ],
   "domparsing/XMLSerializer-serializeToString.html": [
-   "8ee4aa486f63674831842c5c4e5aceaec7e2d491",
+   "d71da494fe7dbce56af5e45926739c7b6a232676",
    "testharness"
   ],
   "domparsing/createContextualFragment.html": [
@@ -614977,7 +615211,7 @@
    "support"
   ],
   "domxpath/document.tentative.html": [
-   "c44ebd9937574ff071c7f0f2484ba5ea0ee15125",
+   "b75c0f0d66dacb47a825ae2aa00bb63a19616433",
    "testharness"
   ],
   "domxpath/evaluator-constructor.html": [
@@ -615532,12 +615766,16 @@
    "4d59d4afc9f8e501a0a764cbce980d0d276250fe",
    "testharness"
   ],
-  "element-timing/cross-origin-element.html": [
-   "1b899b00e3abc5425bb8e97528c8635d6aabff75",
+  "element-timing/cross-origin-element.sub.html": [
+   "ed820d0e66558d1db01109a6c4227c960f15644b",
    "testharness"
   ],
-  "element-timing/cross-origin-iframe-element.html": [
-   "7f73881cc9726fa72c896fd1fbd1a496ade46695",
+  "element-timing/cross-origin-iframe-element.sub.html": [
+   "a369d25bd43c6565ab4367b0a381ab39ec8664b7",
+   "testharness"
+  ],
+  "element-timing/image-TAO-wildcard.sub.html": [
+   "6d5abe21c3c353e55b058655684197ba986d8e64",
    "testharness"
   ],
   "element-timing/image-not-fully-visible.html": [
@@ -615545,7 +615783,7 @@
    "testharness"
   ],
   "element-timing/observe-child-element.html": [
-   "5bb8290893a7d80749e2dd03239c9c3f2f158b88",
+   "83cc2ef94b3fe929ffd87b6c4a49f7424e6be29b",
    "testharness"
   ],
   "element-timing/observe-elementtiming.html": [
@@ -615564,6 +615802,10 @@
    "6fdff39d53848546e113b72ca17e38fd9b0dabc7",
    "testharness"
   ],
+  "element-timing/resources/TAOImage.py": [
+   "5d042c48941d09ca2d494f054d3625503beaeef0",
+   "support"
+  ],
   "element-timing/resources/circle.svg": [
    "209b9f4e5b5d55b45b5ec80dac25873d06dfb593",
    "support"
@@ -629665,7 +629907,7 @@
    "support"
   ],
   "html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js": [
-   "cf175eb4d3ae688ece3fffa2e9d3d90a6ec69657",
+   "77f8fff5b5701ae2b3138116429974c4e9f2608f",
    "support"
   ],
   "html/infrastructure/urls/resolving-urls/query-encoding/resources/resource.py": [
@@ -631028,14 +631270,6 @@
    "a809cc44b19796e50b7564b852a3234cca7e51f0",
    "testharness"
   ],
-  "html/semantics/document-metadata/the-link-element/link-multiple-error-events.html": [
-   "ea7e496ae8ea36f4241f565714952f4ac2c1968a",
-   "testharness"
-  ],
-  "html/semantics/document-metadata/the-link-element/link-multiple-load-events.html": [
-   "24cd5ba701184308d7fe28195119552d6431b87d",
-   "testharness"
-  ],
   "html/semantics/document-metadata/the-link-element/link-rel-attribute.html": [
    "14d06227ac862be169c2c1745fd6ec8913836394",
    "testharness"
@@ -641996,6 +642230,10 @@
    "c1fcbca4c1f8366da1dd9eb91bc9427edeef1153",
    "support"
   ],
+  "lifecycle/child-display-none.tentative.html": [
+   "f76b4e7b608d3e4e97dfac100bee6fa63602e0bb",
+   "testharness"
+  ],
   "lifecycle/freeze.html": [
    "88e32c9d3b01eb2622ce90699548d95fba5eb960",
    "testharness"
@@ -642004,6 +642242,10 @@
    "403d01060821820b9d3a772b28a826698c8796e6",
    "support"
   ],
+  "lifecycle/resources/subframe.html": [
+   "2f1d70a80a792401891d93f6ddebaea0876400b3",
+   "support"
+  ],
   "lifecycle/resources/window.html": [
    "69fdbc0986633793d501a4bddfee9e88f76e1348",
    "support"
@@ -642104,7 +642346,7 @@
    "9d0273e19263f026ff588ac59c12c765a341df8b",
    "support"
   ],
-  "longtask-timing/supported-longtask-types.any.js": [
+  "longtask-timing/supported-longtask-types.window.js": [
    "3c68c01d32d614dab435d91a0dce39244f8d7e09",
    "testharness"
   ],
@@ -646460,7 +646702,7 @@
    "3efb52783f1e5dcb0d42aad11aec2a9e47257d33",
    "support"
   ],
-  "navigation-timing/supported_navigation_type.any.js": [
+  "navigation-timing/supported_navigation_type.window.js": [
    "3239c7d29ffb11cbfebda12b4e5420bca0131094",
    "testharness"
   ],
@@ -653473,7 +653715,7 @@
    "testharness"
   ],
   "paint-timing/idlharness.window.js": [
-   "115af73dfc801acc442a1be8942d0b3b519dbb3c",
+   "049f0f18f1be64ad5d250f045b0dda3edbc931a4",
    "testharness"
   ],
   "paint-timing/paint-visited.html": [
@@ -653500,7 +653742,7 @@
    "d4197e8a35c444401b0a7dc84f0fc5a279193ca0",
    "testharness"
   ],
-  "paint-timing/supported-paint-type.any.js": [
+  "paint-timing/supported-paint-type.window.js": [
    "36acf82ca3b646b32977c3d0212a397c6fa8ea09",
    "testharness"
   ],
@@ -653788,8 +654030,12 @@
    "650b76d61f72d82fce1644be95e1ee2b99a90d95",
    "testharness"
   ],
+  "payment-request/payment-request-abort-method-manual.https.html": [
+   "a24bac864aad00afdfe830e04b40ef81a583b341",
+   "manual"
+  ],
   "payment-request/payment-request-abort-method.https.html": [
-   "75e39a011c390fb8c3bbbeba2dbe8826ea6291e1",
+   "cf16401d0b0d3e97f3ab14c337880a4ec0d9ea7f",
    "testharness"
   ],
   "payment-request/payment-request-canmakepayment-method-protection.https.html": [
@@ -653824,6 +654070,10 @@
    "02122203d51eaff6c6639c9762b1495173bbf66e",
    "testharness"
   ],
+  "payment-request/payment-request-multiple-show-manual.https.html": [
+   "cc412171a6d74cd242c32a2bb50b83eaaf156478",
+   "manual"
+  ],
   "payment-request/payment-request-not-exposed.https.worker.js": [
    "e5576e673520ea33504d8ddea0e862d54b28e8fb",
    "testharness"
@@ -653848,8 +654098,12 @@
    "11f75b1c862224b5655cb724d8c8f5b25ab1af00",
    "testharness"
   ],
+  "payment-request/payment-request-show-method-manual.https.html": [
+   "6ef98e85a6092a648897bfbca966d78a5a2195f8",
+   "manual"
+  ],
   "payment-request/payment-request-show-method.https.html": [
-   "3d362596c41c6f6ac7058e752c6c6f0e4f6b3781",
+   "dd04987092b49bbfb5d525da7ce0af63fa60a495",
    "testharness"
   ],
   "payment-request/payment-response/complete-method-manual.https.html": [
@@ -654085,7 +654339,7 @@
    "testharness"
   ],
   "picture-in-picture/request-picture-in-picture-twice.html": [
-   "17e494bbe88b52b68a6e34e5be37a346479087e1",
+   "fd8541bc1deeaedb765b7fc8e88ec7214fc1ab67",
    "testharness"
   ],
   "picture-in-picture/request-picture-in-picture.html": [
@@ -670736,6 +670990,10 @@
    "2d52fd678ab1f602b81295904afdd428a3c736db",
    "testharness"
   ],
+  "streams/readable-streams/async-iterator.any.js": [
+   "c59cbeb682018991692b3d2f443b7ca2da38a94e",
+   "testharness"
+  ],
   "streams/readable-streams/bad-strategies.any.js": [
    "5dab51ef771ee48e537a5f9a9f8cb7514d411797",
    "testharness"
@@ -670745,7 +671003,7 @@
    "testharness"
   ],
   "streams/readable-streams/brand-checks.any.js": [
-   "2906494bdf6b378d07f6fbb916a8f6cb63681b63",
+   "521e4360667b96dae29ce225e374d5c665004bc9",
    "testharness"
   ],
   "streams/readable-streams/cancel.any.js": [
@@ -670773,11 +671031,11 @@
    "testharness"
   ],
   "streams/readable-streams/general.any.js": [
-   "f885ed6dbcdc6983ce1a52f60af492e875503d03",
+   "e9a107db1a36964044eb53a18ea53105140d0f42",
    "testharness"
   ],
   "streams/readable-streams/patched-global.any.js": [
-   "fa49249a9b5e78548892d6405460b88eb6e68361",
+   "500979f5b37ad1af106fcbb76ca531d4dc539129",
    "testharness"
   ],
   "streams/readable-streams/reentrant-strategies.any.js": [
@@ -679777,7 +680035,7 @@
    "support"
   ],
   "tools/tox.ini": [
-   "975056ea2c272bd70e117231f0d57928727f6bd1",
+   "bb9873d5bc67cb15de4bd29cab6c1729ea5b94ce",
    "support"
   ],
   "tools/webdriver/.gitignore": [
@@ -679869,7 +680127,7 @@
    "support"
   ],
   "tools/wpt/tox.ini": [
-   "0b354e755300c325bdae3b0bc7fe75f9bb99f5d5",
+   "d0dead55d9aa863dd4bd50c941f45ab462f4ede9",
    "support"
   ],
   "tools/wpt/update.py": [
@@ -680097,7 +680355,7 @@
    "support"
   ],
   "tools/wptrunner/tox.ini": [
-   "4f5dcfb47bec9a0dee6e81bb38234ad43791e3c6",
+   "d784c5b299e353f8c85aad5881caeab535522a52",
    "support"
   ],
   "tools/wptrunner/wptrunner.default.ini": [
@@ -684340,14 +684598,18 @@
    "ab9d5fe5a9dbd736a079f0cfd7966d5e064ed7ef",
    "support"
   ],
-  "webaudio/the-audio-api/the-audiobuffersourcenode-interface/resources/sub-sample-scheduling.html": [
-   "27ac0984a79ef276f6f6e32dc9814131487de31a",
-   "support"
-  ],
   "webaudio/the-audio-api/the-audiobuffersourcenode-interface/sample-accurate-scheduling.html": [
    "5fafd024eef9b476f4d97b2ebaa2190a4ca520d5",
    "testharness"
   ],
+  "webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html": [
+   "b69cb0e81259a4e47cff1ae11befbe63341d4849",
+   "testharness"
+  ],
+  "webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html": [
+   "27ac0984a79ef276f6f6e32dc9814131487de31a",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-audiocontext-interface/.gitkeep": [
    "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
    "support"
@@ -691505,7 +691767,7 @@
    "support"
   ],
   "webxr/resources/webxr_util.js": [
-   "7344fa05f655cded22a3ba9b099a8726a0c4beb3",
+   "26e30c48f36f22d1cb7ef6ffe0e6b9e11979f7b9",
    "support"
   ],
   "webxr/webGLCanvasContext_create_xrcompatible.https.html": [
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
deleted file mode 100644
index 23f053f4f4a..00000000000
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[elementsFromPoint-invalid-cases.html]
-  [The root element is the last element returned for valid queries]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/long_scroll_composited.html.ini b/tests/wpt/metadata/css/cssom-view/long_scroll_composited.html.ini
new file mode 100644
index 00000000000..78492fe9051
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/long_scroll_composited.html.ini
@@ -0,0 +1,2 @@
+[long_scroll_composited.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini b/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
index 96c22d76135..dc236b20cb5 100644
--- a/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
+++ b/tests/wpt/metadata/domparsing/XMLSerializer-serializeToString.html.ini
@@ -15,3 +15,9 @@
   [check XMLSerializer.serializeToString escapes attribute values for roundtripping]
     expected: FAIL
 
+  [Check if generated prefixes match to "ns${index}".]
+    expected: FAIL
+
+  [Check if "ns1" is generated even if the element already has xmlns:ns1.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index 1f22caf8238..c7c51acfe55 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -32,7 +32,7 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
-  expected: TIMEOUT
+  expected: CRASH
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     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 b7bde2f8b95..18f786d4963 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,18 +312,3 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/plain;charset=gbk text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
-    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
deleted file mode 100644
index 78879bad5f1..00000000000
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-undefined.tentative.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[javascript-url-abort-return-value-undefined.tentative.html]
-  expected: TIMEOUT
-  [Not aborting fetch for javascript:undefined navigation]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.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_4.html.ini
index 75d75b4cda2..385376c7321 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_4.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_2.html]
+[traverse_the_history_4.html]
   [Multiple history traversals, last would be aborted]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    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
deleted file mode 100644
index 178680e5d14..00000000000
--- a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[script-onerror-insertion-point-2.html]
-  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
new file mode 100644
index 00000000000..a9677391662
--- /dev/null
+++ b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
@@ -0,0 +1,4 @@
+[DOMContentLoaded-defer.html]
+  [The end: DOMContentLoaded and defer scripts]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
deleted file mode 100644
index 6cf9d13975c..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[iframe_005.html]
-  [document.write external script into iframe write back into parent]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/navigation-timing/supported_navigation_type.window.js.ini b/tests/wpt/metadata/navigation-timing/supported_navigation_type.window.js.ini
new file mode 100644
index 00000000000..e528a82215c
--- /dev/null
+++ b/tests/wpt/metadata/navigation-timing/supported_navigation_type.window.js.ini
@@ -0,0 +1,4 @@
+[supported_navigation_type.window.html]
+  [supportedEntryTypes contains 'navigation'.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 99a24216c88..7725b118e9d 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -12,3 +12,6 @@
   [Verifies the resolution of entry.startTime is at least 5 microseconds.]
     expected: TIMEOUT
 
+  [Verifies the resolution of performance.now() is at least 5 microseconds.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/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/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
new file mode 100644
index 00000000000..b2efe349865
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -0,0 +1,13 @@
+[sub-sample-buffer-stitching.html]
+  [X SNR (21.50436285502504 dB) is not greater than or equal to 65.737. Got 21.50436285502504.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 1 out of 2 tasks were failed.]
+    expected: FAIL
+
+  [< [buffer-stitching-2\] 2 out of 3 assertions were failed.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[30\]\t9.4836157560348511e-1\t9.5236867666244507e-1\t4.0071010589599609e-3\t4.2075103446311962e-3\t3.8985999999999999e-3\n\t[31\]\t9.2646563053131104e-1\t9.3139332532882690e-1\t4.9276947975158691e-3\t5.2906700783754857e-3\t3.8985999999999999e-3\n\t[32\]\t9.0087991952896118e-1\t9.0675884485244751e-1\t5.8789253234863281e-3\t6.4834496590358351e-3\t3.8985999999999999e-3\n\t[33\]\t8.7170630693435669e-1\t8.7856203317642212e-1\t6.8557262420654297e-3\t7.8033490899654511e-3\t3.8985999999999999e-3\n\t[34\]\t8.3906102180480957e-1\t8.4691369533538818e-1\t7.8526735305786133e-3\t9.2721059699818163e-3\t3.8985999999999999e-3\n\t...and 31035 more errors.\n\tMax AbsError of 8.5881388187408447e-1 at index of 1570.\n\t[1570\]\t0.0000000000000000e+0\t-8.5881388187408447e-1\t8.5881388187408447e-1\t1.0000000000000000e+0\t3.8985999999999999e-3\n\tMax RelError of 3.3137802965303198e+0 at index of 1253.\n\t[1253\]\t-4.3022233992815018e-2\t-9.9732093513011932e-3\t3.3049024641513824e-2\t3.3137802965303198e+0\t3.8985999999999999e-3\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html.ini
new file mode 100644
index 00000000000..f5ac249dd65
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html.ini
@@ -0,0 +1,49 @@
+[sub-sample-scheduling.html]
+  [X output0[3\] is not equal to 0. Got 1.]
+    expected: FAIL
+
+  [X output1 expected to be equal to the array [0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1...\] but differs in 84 places:\n\tIndex\tActual\t\t\tExpected\n\t[44\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[45\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[46\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[47\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t...and 80 more errors.]
+    expected: FAIL
+
+  [< [sub-sample-grain\] 5 out of 16 assertions were failed.]
+    expected: FAIL
+
+  [X With playbackRate 0.25: output0[18\] is not close to 1.0499999999999998 within a relative error of 4.542e-8 (RelErr=0.04761904761904746). Got 1.]
+    expected: FAIL
+
+  [< [sub-sample accurate start with playbackRate\] 2 out of 5 assertions were failed.]
+    expected: FAIL
+
+  [X output0[0:33\]: Expected 0 for all values but found 1 unexpected values: \n\tIndex\tActual\n\t[33\]\t1]
+    expected: FAIL
+
+  [X output0[38\] is not equal to 0. Got 1.]
+    expected: FAIL
+
+  [X With playbackRate 4: output1[18\] is not close to 1.7999999999999972 within a relative error of 4.542e-8 (RelErr=0.4444444444444436). Got 1.]
+    expected: FAIL
+
+  [X output1[33\] should not be equal to 0. Got 0.]
+    expected: FAIL
+
+  [X output1[34:8190\] does not equal [1.100000023841858,2.0999999046325684,3.0999999046325684,4.099999904632568,5.099999904632568,6.099999904632568,7.099999904632568,8.100000381469727,9.100000381469727,10.100000381469727,11.100000381469727,12.100000381469727,13.100000381469727,14.100000381469727,15.100000381469727,16.100000381469727...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t1.0000000000000000e+0\t1.1000000238418579e+0\t1.0000002384185791e-1\t9.0909110613105290e-2\t0.0000000000000000e+0\n\t[1\]\t2.0000000000000000e+0\t2.0999999046325684e+0\t9.9999904632568359e-2\t4.7619004368509764e-2\t0.0000000000000000e+0\n\t[2\]\t3.0000000000000000e+0\t3.0999999046325684e+0\t9.9999904632568359e-2\t3.2258034744817511e-2\t0.0000000000000000e+0\n\t[3\]\t4.0000000000000000e+0\t4.0999999046325684e+0\t9.9999904632568359e-2\t2.4390221209414906e-2\t0.0000000000000000e+0\n\t[4\]\t5.0000000000000000e+0\t5.0999999046325684e+0\t9.9999904632568359e-2\t1.9607824804414951e-2\t0.0000000000000000e+0\n\t...and 8152 more errors.\n\tMax AbsError of 1.0009765625000000e-1 at index of 2047.\n\t[2047\]\t2.0480000000000000e+3\t2.0481000976562500e+3\t1.0009765625000000e-1\t4.8873419987893697e-5\t0.0000000000000000e+0\n\tMax RelError of 9.0909110613105290e-2 at index of 0.\n]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 4 out of 4 tasks were failed.]
+    expected: FAIL
+
+  [X output0[34:8190\] does not equal [1.899999976158142,2.9000000953674316,3.9000000953674316,4.900000095367432,5.900000095367432,6.900000095367432,7.900000095367432,8.899999618530273,9.899999618530273,10.899999618530273,11.899999618530273,12.899999618530273,13.899999618530273,14.899999618530273,15.899999618530273,16.899999618530273...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t2.0000000000000000e+0\t1.8999999761581421e+0\t1.0000002384185791e-1\t5.2631592156154129e-2\t0.0000000000000000e+0\n\t[1\]\t3.0000000000000000e+0\t2.9000000953674316e+0\t9.9999904632568359e-2\t3.4482724601392921e-2\t0.0000000000000000e+0\n\t[2\]\t4.0000000000000000e+0\t3.9000000953674316e+0\t9.9999904632568359e-2\t2.5641000560833845e-2\t0.0000000000000000e+0\n\t[3\]\t5.0000000000000000e+0\t4.9000000953674316e+0\t9.9999904632568359e-2\t2.0408143405366560e-2\t0.0000000000000000e+0\n\t[4\]\t6.0000000000000000e+0\t5.9000000953674316e+0\t9.9999904632568359e-2\t1.6949136104436064e-2\t0.0000000000000000e+0\n\t...and 8152 more errors.\n\tMax AbsError of 1.0009765625000000e-1 at index of 2047.\n\t[2047\]\t2.0490000000000000e+3\t2.0488999023437500e+3\t1.0009765625000000e-1\t4.8854341852180105e-5\t0.0000000000000000e+0\n\tMax RelError of 5.2631592156154129e-2 at index of 0.\n]
+    expected: FAIL
+
+  [< [sub-sample accurate start\] 3 out of 6 assertions were failed.]
+    expected: FAIL
+
+  [X output1[44\] is not equal to 0. Got 1.]
+    expected: FAIL
+
+  [< [sub-sample accurate stop\] 1 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [X output0 expected to be equal to the array [0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1...\] but differs in 91 places:\n\tIndex\tActual\t\t\tExpected\n\t[3\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[38\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[39\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t[40\]\t1.0000000000000000e+0\t0.0000000000000000e+0\n\t...and 87 more errors.]
+    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 f584fce5df1..268949ced5c 100644
--- a/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
+++ b/tests/wpt/metadata/workers/semantics/multiple-workers/005.html.ini
@@ -1,5 +1,4 @@
 [005.html]
-  expected: ERROR
   [dedicated worker in shared worker in dedicated worker]
     expected: FAIL
 
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
new file mode 100644
index 00000000000..dbea4f293ad
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
@@ -0,0 +1,2 @@
+[transition_calc_implicit.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration-ref.html
new file mode 100644
index 00000000000..96acf1ad96c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>Reference for Animation Worklet local time set after duration</title>
+<style>
+#box {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  will-change: transform;
+}
+</style>
+
+<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html
new file mode 100644
index 00000000000..adc90f1d3f6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html
@@ -0,0 +1,41 @@
+<html class="reftest-wait">
+<title>Animation Worklet local time set after duration</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+<meta name="assert" content="If an effect doesn't have fill-mode specified, setting its local time beyond its duration makes the animation inactive.">
+<link rel="match" href="worklet-animation-local-time-after-duration-ref.html">
+
+<script src="/web-animations/testcommon.js"></script>
+<script src="/common/reftest-wait.js"></script>
+<script src="common.js"></script>
+
+<style>
+  #box {
+    width: 100px;
+    height: 100px;
+    background-color: green;
+  }
+</style>
+
+<div id="box"></div>
+
+<script>
+  registerConstantLocalTimeAnimator(2000).then(() => {
+    const box = document.getElementById('box');
+    const effect = new KeyframeEffect(box,
+      [
+      { transform: 'translateY(100px)' },
+      { transform: 'translateY(200px)' }
+      ], {
+        duration: 1000,
+        delay: 1000
+      }
+    );
+
+    const animation = new WorkletAnimation('constant_time', effect);
+    animation.play();
+
+    waitForAsyncAnimationFrames(1).then(_ => {
+      takeScreenshot();
+    });
+  });
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html
new file mode 100644
index 00000000000..cda4ca4132c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>Reference for Animation Worklet local time set before start</title>
+<style>
+#box {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  will-change: transform;
+  transform: translateY(200px);
+}
+</style>
+
+<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html
new file mode 100644
index 00000000000..addb16e7d17
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html
@@ -0,0 +1,41 @@
+<html class="reftest-wait">
+<title>Animation Worklet local time set before start</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+<meta name="assert" content="The local time should be trimmed by the duration, e.g. this is equivalent to effect.localTime = 0">
+<link rel="match" href="worklet-animation-local-time-before-start-ref.html">
+
+<script src="/web-animations/testcommon.js"></script>
+<script src="/common/reftest-wait.js"></script>
+<script src="common.js"></script>
+
+<style>
+  #box {
+    width: 100px;
+    height: 100px;
+    background-color: green;
+  }
+</style>
+
+<div id="box"></div>
+
+<script>
+  registerConstantLocalTimeAnimator(-500).then(() => {
+    const box = document.getElementById('box');
+    const effect = new KeyframeEffect(box,
+      [
+      { transform: 'translateY(200px)' },
+      { transform: 'translateY(0px)' }
+      ], {
+        duration: 1000,
+        fill: 'backwards'
+      }
+    );
+
+    const animation = new WorkletAnimation('constant_time', effect);
+    animation.play();
+
+    waitForAsyncAnimationFrames(1).then(_ => {
+      takeScreenshot();
+    });
+  });
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1a.html b/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1a.html
new file mode 100644
index 00000000000..a55e2318ca4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1a.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>
+    CSS Test: baseline of scrollable element should be taken from its
+    contents. (Except if the scrollable element is an inline-block, which gets
+    baseline from its margin-box.)
+  </title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+  <link rel="help" href="https://drafts.csswg.org/css-align/#baseline-export">
+  <link rel="match" href="reference/baseline-of-scrollable-1-ref.html">
+  <style>
+    .container {
+      overflow: hidden;
+      height: 50px;
+      width: 100px;
+      border-style: solid;
+      border-width: 2px 3px 4px 5px;
+      padding: 4px 5px 7px 8px;
+      margin: 1px 2px 3px 4px;
+    }
+    .inline-block {
+      display: inline-block;
+    }
+    .inline-flex {
+      display: inline-flex;
+    }
+    .inline-grid {
+      display: inline-grid;
+    }
+</style>
+</head>
+<body>
+  Test passes if the a/b text aligns with the bottom margin-edge of the "block"
+  rect and baseline-aligns with the "flex" and "grid" text.
+  <br><br>
+
+  <!-- Note: for this first "inline-block" case, the element's baseline is
+       synthesized from its margin box.  For the other cases, the element's
+       baseline is taken from its contents, i.e. the text inside of it. -->
+  a
+  <div class="container inline-block">block</div>
+  b
+  <br>
+
+  a
+  <div class="container inline-flex">flex</div>
+  b
+  <br>
+
+  a
+  <div class="container inline-grid">grid</div>
+  b
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1b.html b/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1b.html
new file mode 100644
index 00000000000..79db8a85434
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-align/baseline-of-scrollable-1b.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>
+    CSS Test: baseline of scrollable element (for use by a parent inline-block)
+    should be taken from its contents. (Except if the scrollable element is a
+    block, which gets baseline from its margin-box.)
+  </title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+  <link rel="help" href="https://drafts.csswg.org/css-align/#baseline-export">
+  <link rel="match" href="reference/baseline-of-scrollable-1-ref.html">
+  <style>
+    .container {
+      overflow: hidden;
+      height: 50px;
+      width: 100px;
+      border-style: solid;
+      border-width: 2px 3px 4px 5px;
+      padding: 4px 5px 7px 8px;
+      margin: 1px 2px 3px 4px;
+    }
+    .inline-block {
+      display: inline-block;
+    }
+    .block {
+      display: block;
+    }
+    .flex {
+      display: flex;
+    }
+    .grid {
+      display: grid;
+    }
+</style>
+</head>
+<body>
+  Test passes if the a/b text aligns with the bottom margin-edge of the "block"
+  rect and baseline-aligns with the "flex" and "grid" text.
+  <br><br>
+
+  <!-- Note: for this first "inline-block" case, the element's baseline is
+       synthesized from its margin box.  For the other cases, the element's
+       baseline is taken from its contents, i.e. the text inside of it. -->
+  a
+  <div class="inline-block">
+    <div class="container block">block</div>
+  </div>
+  b
+  <br>
+
+  a
+  <div class="inline-block">
+    <div class="container flex">flex</div>
+  </div>
+  b
+  <br>
+
+  a
+  <div class="inline-block">
+    <div class="container grid">grid</div>
+  </div>
+  b
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-align/reference/baseline-of-scrollable-1-ref.html b/tests/wpt/web-platform-tests/css/css-align/reference/baseline-of-scrollable-1-ref.html
new file mode 100644
index 00000000000..422660aff6b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-align/reference/baseline-of-scrollable-1-ref.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>
+    CSS Reference Case
+  </title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+  <link rel="help" href="https://drafts.csswg.org/css-align/#baseline-export">
+  <style>
+    .container {
+      /* In this reference case, we leave 'overflow' at its initial value. */
+      height: 50px;
+      width: 100px;
+      border-style: solid;
+      border-width: 2px 3px 4px 5px;
+      padding: 4px 5px 7px 8px;
+      margin: 1px 2px 3px 4px;
+    }
+    .inline-block {
+      display: inline-block;
+    }
+    .inline-flex {
+      display: inline-flex;
+    }
+    .inline-grid {
+      display: inline-grid;
+    }
+</style>
+</head>
+<body>
+  Test passes if the a/b text aligns with the bottom margin-edge of the "block"
+  rect and baseline-aligns with the "flex" and "grid" text.
+  <br><br>
+
+  <!-- Note: for this first "inline-block" case, we take the inner text out of
+       flow, to force the inline-block to synthesize its baseline from its
+       margin box.  (This is how the corresponding piece of the testcase is
+       supposed to render). -->
+  a
+  <div class="container inline-block">
+    <div style="position: absolute">block</div>
+  </div>
+  b
+  <br>
+
+  a
+  <div class="container inline-flex">flex</div>
+  b
+  <br>
+
+  a
+  <div class="container inline-grid">grid</div>
+  b
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/inheritance.html b/tests/wpt/web-platform-tests/css/css-lists/inheritance.html
index ff1bcdcfb46..590319d63fd 100644
--- a/tests/wpt/web-platform-tests/css/css-lists/inheritance.html
+++ b/tests/wpt/web-platform-tests/css/css-lists/inheritance.html
@@ -17,7 +17,7 @@
 <script>
 assert_not_inherited('counter-increment', 'none', 'foo 123');
 assert_not_inherited('counter-reset', 'none', 'foo 123');
-assert_inherited('list-style-image', 'none', 'url("https://example.com/")');
+assert_inherited('list-style-image', 'none', 'url("data:,a")');
 assert_inherited('list-style-position', 'outside', 'inside');
 assert_inherited('list-style-type', 'disc', 'square');
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order-ref.html b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order-ref.html
index e5763bfdf70..fe9511a8dfc 100644
--- a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order-ref.html
@@ -3,19 +3,22 @@
 <title>Clip should be applied after filtering</title>
 <link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
 
+<style>
+  body { margin: 0 }
+  #testcase {
+    position: absolute;
+    left: 10px;
+    width: 200px;
+    height: 200px;
+    background: green;
+    will-change: transform;
+  }
+</style>
+
 <div>
   <p>Expected: A green box.<br>
   There should be no red visible.<br>
   There should be a crisp, clipped edge around the green box (no blurring).</p>
 </div>
 
-<style>
-  #testcase {
-    position: absolute;
-    width: 200px;
-    height: 200px;
-    background: green;
-    will-change: transform;
-  }
-</style>
 <div id="testcase"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order.html b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order.html
index 79f2f71488d..0570d02b85e 100644
--- a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order.html
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-filter-order.html
@@ -5,15 +5,11 @@
 <link rel="help" href="https://drafts.fxtf.org/css-masking-1/#placement">
 <link rel="match" href="clip-filter-order-ref.html">
 
-<div>
-  <p>Expected: A green box.<br>
-  There should be no red visible.<br>
-  There should be a crisp, clipped edge around the green box (no blurring).</p>
-</div>
-
 <style>
+  body { margin: 0 }
   #testcase {
     position: absolute;
+    left: 10px;
     width: 400px;
     height: 400px;
     background: green;
@@ -22,4 +18,11 @@
     clip: rect(0px, 200px, 200px, 0px);
   }
 </style>
+
+<div>
+  <p>Expected: A green box.<br>
+  There should be no red visible.<br>
+  There should be a crisp, clipped edge around the green box (no blurring).</p>
+</div>
+
 <div id="testcase"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order-2.html b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order-2.html
new file mode 100644
index 00000000000..bd8e909d76d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order-2.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<title>Clips should be applied before transforms (when fixed positioned too)</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#placement">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1524966">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="match" href="clip-filter-order-ref.html">
+
+<style>
+  body { margin: 0; overflow: hidden; }
+  #testcase {
+    position: fixed;
+    left: -100px;
+    width: 400px;
+    height: 400px;
+    background: green;
+    transform: translateX(110px);
+    clip: rect(0px, 200px, 200px, 0px);
+  }
+</style>
+
+<div>
+  <p>Expected: A green box.<br>
+  There should be no red visible.<br>
+  There should be a crisp, clipped edge around the green box (no blurring).</p>
+</div>
+
+<div id="testcase"><div></div></div>
+
+<div id="padding" style="height: 100vh"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order.html b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order.html
new file mode 100644
index 00000000000..1f24864bc96
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip/clip-transform-order.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>Clips should be applied before transforms</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#placement">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1524966">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="match" href="clip-filter-order-ref.html">
+
+<style>
+  body { margin: 0 }
+  #testcase {
+    position: absolute;
+    left: -100px;
+    width: 400px;
+    height: 400px;
+    background: green;
+    transform: translateX(110px);
+    clip: rect(0px, 200px, 200px, 0px);
+  }
+</style>
+
+<div>
+  <p>Expected: A green box.<br>
+  There should be no red visible.<br>
+  There should be a crisp, clipped edge around the green box (no blurring).</p>
+</div>
+
+<div id="testcase"><div></div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html b/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html
index 0a69faa39c1..2d34e05a98b 100644
--- a/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html
+++ b/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html
@@ -21,17 +21,17 @@
 function testUrange(input, expected) {
     test(()=>{
         const rule = document.styleSheets[0].cssRules[0];
-        rule.style.unicodeRange = "U+1357";
-        rule.style.unicodeRange = input;
-        assert_equals(rule.style.unicodeRange.toUpperCase(), expected.toUpperCase());
+        rule.style.setProperty("unicode-range", "U+1357");
+        rule.style.setProperty("unicode-range", input);
+        assert_equals(rule.style.getPropertyValue("unicode-range").toUpperCase(), expected.toUpperCase());
     }, `"${input}" => "${expected}"`)
 }
 function testInvalidUrange(input) {
     test(()=>{
         const rule = document.styleSheets[0].cssRules[0];
-        rule.style.unicodeRange = "U+1357";
-        rule.style.unicodeRange = input;
-        assert_equals(rule.style.unicodeRange.toUpperCase(), "U+1357");
+        rule.style.setProperty("unicode-range", "U+1357");
+        rule.style.setProperty("unicode-range", input);
+        assert_equals(rule.style.getPropertyValue("unicode-range").toUpperCase(), "U+1357");
     }, `"${input}" is invalid`);
 }
 
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/baseline-with-orthogonal-flow-001.html b/tests/wpt/web-platform-tests/css/css-writing-modes/baseline-with-orthogonal-flow-001.html
new file mode 100644
index 00000000000..f054c59b6d7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/baseline-with-orthogonal-flow-001.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>
+    CSS Test: orthogonal-flow child should be skipped over when determining parent's last-baseline
+  </title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+  <link rel="help" href="https://drafts.csswg.org/css-align/#baseline-export">
+  <link rel="match" href="reference/baseline-with-orthogonal-flow-001-ref.html">
+  <!-- The inline-blocks in this example are using last-baseline alignment, and
+       css-align-3 sec 9.1 says they should take their last-baseline position:
+         "from the ...(last) in-flow block-level child in the block container
+         that contributes a set of ... (last) baselines".
+
+       The orthogonal-flow doesn't contribute a first/last baseline set (not
+       for its parent's writing-mode at least), so it should not affect the
+       baseline determination.
+  -->
+  <style>
+    .ib {
+      display: inline-block;
+    }
+    .vert {
+      writing-mode: vertical-rl;
+      color: transparent;
+    }
+    .overflow {
+      overflow: hidden;
+    }
+  </style>
+</head>
+<body>
+  Test passes if the visible characters below are baseline-aligned.
+  <br><br>
+
+  aaa
+
+  <div class="ib">
+    bbb
+    <!-- This shouldn't influence the baseline of our inline block: -->
+    <div class="vert">vvv</div>
+  </div>
+
+  <div class="ib">
+    ccc
+    <!-- This shouldn't influence the baseline of our inline block: -->
+    <div class="vert overflow">ooo</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-writing-modes/reference/baseline-with-orthogonal-flow-001-ref.html b/tests/wpt/web-platform-tests/css/css-writing-modes/reference/baseline-with-orthogonal-flow-001-ref.html
new file mode 100644
index 00000000000..dda75ca1ef4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-writing-modes/reference/baseline-with-orthogonal-flow-001-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>
+    CSS Reference Case
+  </title>
+  <style>
+    .ib {
+      display: inline-block;
+    }
+  </style>
+</head>
+<body>
+  Test passes if the visible characters below are baseline-aligned.
+  <br><br>
+
+  aaa
+
+  <div class="ib">
+    bbb
+  </div>
+
+  <div class="ib">
+    ccc
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited-ref.html b/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited-ref.html
new file mode 100644
index 00000000000..6914cba3097
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Long scrolling should work properly</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+
+
+
+<style>
+.post {
+  height: 1000px;
+  width: 300px;
+  border: 1px solid black;
+
+}
+.before {
+  height: 213px;
+  border-top: 0;
+}
+.scroller {
+  overflow-y: scroll;
+  width: 500px;
+  height: 500px;
+  will-change: transform;
+}
+::-webkit-scrollbar {
+  display: none;
+}
+</style>
+
+<p>The number 7 should be visible in the scrolled window below.</p>
+
+<div id="scroller" class="scroller">
+  <div style="position: relative;">
+    <div style="position: relative;">
+      <div class="post before"></div>
+      <div class="post">7</div>
+    </div>
+  </div>
+</div>
+
+
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited.html b/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited.html
new file mode 100644
index 00000000000..aa91023c1ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/long_scroll_composited.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Long scrolling should work properly</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/cssom-view/#scrolling">
+<link rel="match" href="long_scroll_composited-ref.html">
+
+<style>
+.post {
+  height: 1000px;
+  width: 300px;
+  border: 1px solid black;
+
+}
+.scroller {
+  overflow-y: scroll;
+  width: 500px;
+  height: 500px;
+  will-change: transform;
+}
+::-webkit-scrollbar {
+  display: none;
+}
+</style>
+
+<p>The number 7 should be visible in the scrolled window below.</p>
+
+<div id="scroller" class="scroller">
+  <div style="position: relative;">
+    <div style="position: relative;">
+      <div class="post">0</div>
+      <div class="post">1</div>
+      <div class="post">2</div>
+      <div class="post">3</div>
+      <div class="post">4</div>
+      <div class="post">5</div>
+      <div class="post">6</div>
+      <div class="post">7</div>
+      <div class="post">8</div>
+      <div class="post">9</div>
+    </div>
+  </div>
+</div>
+
+<script>
+onload = function() {
+  scroller=document.getElementById("scroller");
+  scroller.scrollTop = 6800;
+};
+</script>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/scroll-behavior-main-frame-window.html b/tests/wpt/web-platform-tests/css/cssom-view/scroll-behavior-main-frame-window.html
index 57b0d913461..8024d5319b4 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/scroll-behavior-main-frame-window.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/scroll-behavior-main-frame-window.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <title>Testing scrollOptions' behavior for Element.scroll* on the window of the main frame</title>
 <meta name="timeout" content="long"/>
+<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
 <link rel="author" title="Frédéric Wang" href="mailto:fwang@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/cssom-view/#propdef-scroll-behavior">
 <link rel="help" href="https://drafts.csswg.org/cssom-view/#scrolling-box">
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius-ref.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius-ref.html
deleted file mode 100644
index e5712a23774..00000000000
--- a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius-ref.html
+++ /dev/null
@@ -1,36 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>backdrop-filter: Should clip using border radius.</title>
-<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
-
-
-
-<div>
-  <div class="circle outside"></div>
-  <div class="circle inside"></div>
-</div>
-
-
-<style>
-div {
-  position: absolute;
-  width: 100px;
-  height: 100px;
-  top: 10px;
-  left: 10px;
-  background: green;
-}
-.circle {
-  top: 30px;
-  left: 30px;
-  border-radius: 50px;
-  background: #ffff0060;
-}
-.inside {
-  background: #ffaf9f;
-  clip-path: inset(0px 30px 30px 0px);
-}
-.outside {
-  background: #ffff9f;
-}
-</style>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius.html
deleted file mode 100644
index ec93de698aa..00000000000
--- a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-border-radius.html
+++ /dev/null
@@ -1,32 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>backdrop-filter: Should clip using border radius.</title>
-<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
-<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
-<link rel="match"  href="backdrop-filter-border-radius-ref.html">
-
-<div style="opacity: 0.9999;">
-  <div class="circle filter"></div>
-
-</div>
-
-
-<style>
-div {
-  position: absolute;
-  width: 100px;
-  height: 100px;
-  top: 10px;
-  left: 10px;
-  background: green;
-}
-.circle {
-  top: 30px;
-  left: 30px;
-  border-radius: 50px;
-  background: #ffff0060;
-}
-.filter {
-  backdrop-filter: invert(1);
-}
-</style>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007-ref.html
new file mode 100644
index 00000000000..ccde6012b5f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007-ref.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Reftest Reference</title>
+    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+    <style>
+      .flexbox {
+        border: 1px solid black;
+        margin: 0 2px 2px 0; /* (Just for spacing things out, visually) */
+        width: 40px;
+        height: 40px;
+
+        float: left; /* For testing in "rows" */
+      }
+      img {
+        padding: 1px 2px 3px 4px;
+        box-sizing: border-box;
+        background: pink;
+      }
+
+      br { clear: both; }
+
+      .flexbox > * {
+        /* Disable "min-width:auto"/"min-height:auto" to focus purely on
+           later channels of influence. */
+        min-width: 0;
+        min-height: 0;
+        vertical-align: top;
+      }
+    </style>
+  </head>
+  <body>
+    <!-- NOTE: solidblue.png has an intrinsic size of 16px by 16px. -->
+
+    <!-- Row 1: no special sizing: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png">
+    </div>
+    <br>
+
+    <!-- Row 2: Specified main-size, cross-size, or flex-basis: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              height: 28px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 32px;
+                                              height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              height: 28px">
+    </div>
+    <br>
+
+    <!-- Row 3: min main-size OR min cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 34px;
+                                              height: 32px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 36px;
+                                              height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 36px;
+                                              height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 34px;
+                                              height: 32px">
+    </div>
+    <br>
+
+    <!-- Row 4: max main-size OR max cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 16px;
+                                              height: 14px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 18px;
+                                              height: 16px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 16px;
+                                              height: 14px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 14px;
+                                              height: 12px">
+    </div>
+    <br>
+
+    <!-- Row 5: min main-size vs. max cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 10px;
+                                              height: 30px">
+    </div>
+    <br>
+
+    <!-- Row 6: min|max main-size vs. explicit cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 10px;
+                                              height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 10px;
+                                              height: 30px">
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007.html
new file mode 100644
index 00000000000..ea9179c32ca
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007.html
@@ -0,0 +1,132 @@
+<!DOCTYPE html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>
+      CSS Test: Testing how explicit main-size & cross-size constraints
+      influence sizing on non-stretched flex item w/ intrinsic ratio,
+      some padding, and box-sizing:border-box.
+    </title>
+    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+    <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#hypothetical-main-size">
+    <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#hypothetical-cross-size">
+    <link rel="match" href="flexbox-intrinsic-ratio-007-ref.html">
+    <style>
+      .flexbox {
+        display: flex;
+        flex-direction: row;
+        border: 1px solid black;
+        margin: 0 2px 2px 0; /* (Just for spacing things out, visually) */
+        width: 40px;
+        height: 40px;
+
+        justify-content: flex-start;
+        align-items: flex-start;
+
+        float: left; /* For testing in "rows" */
+      }
+      img {
+        padding: 1px 2px 3px 4px;
+        box-sizing: border-box;
+        background: pink;
+      }
+
+      br { clear: both; }
+
+      .flexbox > * {
+        /* Disable "min-width:auto"/"min-height:auto" to focus purely on
+           later channels of influence. */
+        min-width: 0;
+        min-height: 0;
+      }
+    </style>
+  </head>
+  <body>
+    <!-- NOTE: solidblue.png has an intrinsic size of 16px by 16px. -->
+
+    <!-- Row 1: no special sizing: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png">
+    </div>
+    <br>
+
+    <!-- Row 2: Specified main-size, cross-size, or flex-basis: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="flex: 0 0 30px">
+    </div>
+    <br>
+
+    <!-- Row 3: min main-size OR min cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              min-height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 34px;
+                                              min-height: 30px">
+    </div>
+    <br>
+
+    <!-- Row 4: max main-size OR max cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 16px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-height: 16px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 20px;
+                                              max-height: 14px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 14px;
+                                              max-height: 20px">
+    </div>
+    <br>
+
+    <!-- Row 5: min main-size vs. max cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              max-height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 10px;
+                                              min-height: 30px">
+    </div>
+    <br>
+
+    <!-- Row 6: min|max main-size vs. explicit cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              max-height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 10px;
+                                              height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 10px;
+                                              min-height: 30px">
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007v.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007v.html
new file mode 100644
index 00000000000..2efb8b1c18f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-intrinsic-ratio-007v.html
@@ -0,0 +1,134 @@
+<!DOCTYPE html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>
+      CSS Test: Testing how explicit main-size & cross-size constraints
+      influence sizing on non-stretched flex item w/ intrinsic ratio,
+      some padding, box-sizing:border-box, and a vertical writing-mode.
+    </title>
+    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+    <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#hypothetical-main-size">
+    <link rel="help" href="https://www.w3.org/TR/css-flexbox-1/#hypothetical-cross-size">
+    <link rel="match" href="flexbox-intrinsic-ratio-007-ref.html">
+    <style>
+      .flexbox {
+        display: flex;
+        flex-direction: row;
+        border: 1px solid black;
+        margin: 0 2px 2px 0; /* (Just for spacing things out, visually) */
+        width: 40px;
+        height: 40px;
+
+        justify-content: flex-start;
+        align-items: flex-start;
+
+        float: left; /* For testing in "rows" */
+      }
+      img {
+        padding: 1px 2px 3px 4px;
+        box-sizing: border-box;
+        background: pink;
+      }
+
+      br { clear: both; }
+
+      .flexbox > * {
+        writing-mode: vertical-lr;
+
+        /* Disable "min-width:auto"/"min-height:auto" to focus purely on
+           later channels of influence. */
+        min-width: 0;
+        min-height: 0;
+      }
+    </style>
+  </head>
+  <body>
+    <!-- NOTE: solidblue.png has an intrinsic size of 16px by 16px. -->
+
+    <!-- Row 1: no special sizing: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png">
+    </div>
+    <br>
+
+    <!-- Row 2: Specified main-size, cross-size, or flex-basis: -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="flex: 0 0 30px">
+    </div>
+    <br>
+
+    <!-- Row 3: min main-size OR min cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              min-height: 34px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 34px;
+                                              min-height: 30px">
+    </div>
+    <br>
+
+    <!-- Row 4: max main-size OR max cross-size, or both -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 16px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-height: 16px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 20px;
+                                              max-height: 14px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 14px;
+                                              max-height: 20px">
+    </div>
+    <br>
+
+    <!-- Row 5: min main-size vs. max cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              max-height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 10px;
+                                              min-height: 30px">
+    </div>
+    <br>
+
+    <!-- Row 6: min|max main-size vs. explicit cross-size, & vice versa -->
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="min-width: 30px;
+                                              height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 30px;
+                                              max-height: 10px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="max-width: 10px;
+                                              height: 30px">
+    </div>
+    <div class="flexbox">
+      <img src="support/solidblue.png" style="width: 10px;
+                                              min-height: 30px">
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/reftest.list b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/reftest.list
index 5bb3b650139..850651a9f6e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/reftest.list
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/reftest.list
@@ -146,6 +146,8 @@
 == flexbox-intrinsic-ratio-005v.html flexbox-intrinsic-ratio-005-ref.html
 == flexbox-intrinsic-ratio-006.html flexbox-intrinsic-ratio-006-ref.html
 == flexbox-intrinsic-ratio-006v.html flexbox-intrinsic-ratio-006-ref.html
+== flexbox-intrinsic-ratio-007.html flexbox-intrinsic-ratio-007-ref.html
+== flexbox-intrinsic-ratio-007v.html flexbox-intrinsic-ratio-007-ref.html
 
 # Test for definite and indefinite sizes.
 == flexbox-definite-sizes-001.html flexbox-definite-sizes-001-ref.html
diff --git a/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html b/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
index 8ee4aa486f6..d71da494fe7 100644
--- a/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
+++ b/tests/wpt/web-platform-tests/domparsing/XMLSerializer-serializeToString.html
@@ -55,6 +55,26 @@ test(function() {
     '<root attr="&#xD;"/>', '<root attr="&#13;"/>']);
 }, 'check XMLSerializer.serializeToString escapes attribute values for roundtripping');
 
+test(function() {
+  const input = '<root><child1/><child2/></root>';
+  const root = (new DOMParser()).parseFromString(input, 'text/xml').documentElement;
+  root.firstChild.setAttributeNS('uri1', 'attr1', 'value1');
+  root.firstChild.setAttributeNS('uri2', 'attr2', 'value2');
+  root.lastChild.setAttributeNS('uri3', 'attr3', 'value3');
+  const xmlString = (new XMLSerializer()).serializeToString(root);
+  assert_equals(xmlString, '<root><child1 xmlns:ns1="uri1" ns1:attr1="value1" xmlns:ns2="uri2" ns2:attr2="value2"/><child2 xmlns:ns3="uri3" ns3:attr3="value3"/></root>');
+}, 'Check if generated prefixes match to "ns${index}".');
+
+test(function() {
+  const input = '<root xmlns:ns2="uri2"><child xmlns:ns1="uri1"/></root>';
+  const root = (new DOMParser()).parseFromString(input, 'text/xml').documentElement;
+  root.firstChild.setAttributeNS('uri3', 'attr1', 'value1');
+  const xmlString = (new XMLSerializer()).serializeToString(root);
+  // According to 'DOM Parsing and Serialization' draft as of 2018-12-11,
+  // 'generate a prefix' result can conflict with an existing xmlns:ns* declaration.
+  assert_equals(xmlString, '<root xmlns:ns2="uri2"><child xmlns:ns1="uri1" xmlns:ns1="uri3" ns1:attr1="value1"/></root>');
+}, 'Check if "ns1" is generated even if the element already has xmlns:ns1.');
+
 </script>
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/domxpath/document.tentative.html b/tests/wpt/web-platform-tests/domxpath/document.tentative.html
index c44ebd99375..b75c0f0d66d 100644
--- a/tests/wpt/web-platform-tests/domxpath/document.tentative.html
+++ b/tests/wpt/web-platform-tests/domxpath/document.tentative.html
@@ -16,5 +16,16 @@ test(function() {
     matched.push(cur);
   }
   assert_array_equals(matched, [document]);
+  // Evaluate again, but reuse result from previous evaluation.
+  result = document.evaluate("..", // expression
+                            document.documentElement, // context node
+                            null, // resolver
+                            XPathResult.ANY_TYPE, // type
+                            result); // result
+  matched = [];
+  while ((cur = result.iterateNext()) !== null) {
+    matched.push(cur);
+  }
+  assert_array_equals(matched, [document]);
 });
 </script>
diff --git a/tests/wpt/web-platform-tests/element-timing/cross-origin-element.html b/tests/wpt/web-platform-tests/element-timing/cross-origin-element.sub.html
similarity index 68%
rename from tests/wpt/web-platform-tests/element-timing/cross-origin-element.html
rename to tests/wpt/web-platform-tests/element-timing/cross-origin-element.sub.html
index 1b899b00e3a..ed820d0e665 100644
--- a/tests/wpt/web-platform-tests/element-timing/cross-origin-element.html
+++ b/tests/wpt/web-platform-tests/element-timing/cross-origin-element.sub.html
@@ -16,17 +16,20 @@
     // We add the image during onload to be sure that the observer is registered
     // in time for it to observe the element timing.
     // TODO(npm): change observer to use buffered flag.
-    window.onload = () => {
+    window.onload = t.step_func(() => {
       // Add a cross origin image resource.
       const img = document.createElement('img');
-      img.src =
-        'http://localhost:8000/resources/square100.png';
+      img.src = 'http://{{domains[www]}}:{{ports[http][1]}}'
+          + '/element-timing/resources/square100.png';
+      img.setAttribute('elementtiming', 'my_image');
+      img.onload = t.step_func(() => {
+        t.step_timeout( () => {
+          // After some wait, assume observer did not receive the entry, so the test passes.
+          t.done();
+        }, 100);
+      });
       document.body.appendChild(img);
-    };
-    t.step_timeout( () => {
-      // After some wait, assume observer did not receive the entry, so the test passes.
-      t.done();
-    }, 100);
+    });
   }, 'Cross-origin image element is NOT observable.');
 </script>
 
diff --git a/tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.html b/tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.sub.html
similarity index 71%
rename from tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.html
rename to tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.sub.html
index 7f73881cc97..a369d25bd43 100644
--- a/tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.html
+++ b/tests/wpt/web-platform-tests/element-timing/cross-origin-iframe-element.sub.html
@@ -16,17 +16,19 @@
     // We add the iframe during onload to be sure that the observer is registered
     // in time for it to observe the element timing.
     // TODO(npm): change observer to use buffered flag.
-    window.onload = () => {
+    window.onload = t.step_func(() => {
       // Add a cross origin iframe with an image.
       const iframe = document.createElement('iframe');
-      iframe.src =
-        'http://localhost:8000/performance-timing/element-resources/iframe-with-square.html';
+      iframe.src = 'http://{{domains[www]}}:{{ports[http][1]}}'
+          + '/element-timing/resources/iframe-with-square.html';
       document.body.appendChild(iframe);
-    };
-    t.step_timeout( () => {
-      // After some wait, assume observer did not receive the entry, so the test passes.
-      t.done();
-    }, 300);
+      iframe.onload = t.step_func(() => {
+        t.step_timeout( () => {
+          // After some wait, assume observer did not receive the entry, so the test passes.
+          t.done();
+        }, 100);
+      });
+    });
   }, 'Element from cross origin iframe is NOT observable.');
 </script>
 
diff --git a/tests/wpt/web-platform-tests/element-timing/image-TAO-wildcard.sub.html b/tests/wpt/web-platform-tests/element-timing/image-TAO-wildcard.sub.html
new file mode 100644
index 00000000000..6d5abe21c3c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/image-TAO-wildcard.sub.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe elements from same-origin iframes</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  async_test((t) => {
+    let beforeRender;
+    const observer = new PerformanceObserver(
+      t.step_func_done((entryList) => {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        checkElement(entry, 'my_image', beforeRender);
+        // Assume viewport has size at least 20, so the element is fully visible.
+        checkRect(entry, [0, 20, 0, 20]);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+    // We add the image during onload to be sure that the observer is registered
+    // in time for it to observe the element timing.
+    // TODO(npm): change observer to use buffered flag.
+    window.onload = t.step_func(() => {
+      const img = document.createElement('img');
+      img.src = 'http://{{domains[www]}}:{{ports[http][1]}}/'
+          + 'element-timing/resources/TAOImage.py?tao=wildcard';
+      img.setAttribute('elementtiming', 'my_image');
+      img.onload = t.step_func(() => {
+        // After a short delay, assume that the entry was not dispatched.
+        t.step_timeout(() => {
+          assert_unreached("Should have received an entry!");
+          t.done();
+        }, 100);
+      });
+      document.body.appendChild(img);
+      beforeRender = performance.now();
+    });
+  }, 'Cross-origin element with wildcard TAO is observed.');
+</script>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/element-timing/observe-child-element.html b/tests/wpt/web-platform-tests/element-timing/observe-child-element.html
index 5bb8290893a..83cc2ef94b3 100644
--- a/tests/wpt/web-platform-tests/element-timing/observe-child-element.html
+++ b/tests/wpt/web-platform-tests/element-timing/observe-child-element.html
@@ -11,15 +11,10 @@ body {
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/element-timing-helpers.js"></script>
 <script>
-  let beforeRender;
   async_test((t) => {
     const observer = new PerformanceObserver(
       t.step_func_done((entryList) => {
-        assert_equals(entryList.getEntries().length, 1);
-        const entry = entryList.getEntries()[0];
-        checkElement(entry, 'my_image', beforeRender);
-        // Assume viewport has size at least 100, so the element is fully visible.
-        checkRect(entry, [0, 100, 0, 100]);
+        assert_unreached("Should not have received an entry!");
       })
     );
     observer.observe({entryTypes: ['element']});
@@ -30,10 +25,16 @@ body {
       // Add iframe with an image of width and height equal to 100.
       const iframe = document.createElement('iframe');
       iframe.src = 'resources/iframe-with-square.html';
+      iframe.onload = () => {
+        // After a short delay, assume that the entry was not dispatched to the
+        // parent frame.
+        t.step_timeout(() => {
+          t.done();
+        }, 100);
+      }
       document.body.appendChild(iframe);
-      beforeRender = performance.now();
     };
-  }, 'Element from same-origin iframe is observable.');
+  }, 'Element in child iframe is not observed, even if same-origin.');
 </script>
 
 </body>
diff --git a/tests/wpt/web-platform-tests/element-timing/resources/TAOImage.py b/tests/wpt/web-platform-tests/element-timing/resources/TAOImage.py
new file mode 100644
index 00000000000..5d042c48941
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/resources/TAOImage.py
@@ -0,0 +1,45 @@
+import os
+
+def main(request, response):
+    origin = request.GET.first('origin', '');
+    if origin:
+        response.headers.set('Access-Control-Allow-Origin', origin)
+
+    tao = request.GET.first('tao')
+
+    if tao == 'wildcard':
+    # wildcard, pass
+        response.headers.set('Timing-Allow-Origin', '*')
+    elif tao == 'null':
+    # null, fail
+        response.headers.set('Timing-Allow-Origin', 'null')
+    elif tao == 'origin':
+    # case-sensitive match for origin, pass
+        response.headers.set('Timing-Allow-Origin', origin)
+    elif tao == 'space':
+    # space separated list of origin and wildcard, fail
+        response.headers.set('Timing-Allow-Origin', (origin + ' *'))
+    elif tao == 'multi':
+    # more than one TAO values, separated by comma, pass
+        response.headers.set('Timing-Allow-Origin', origin)
+        response.headers.append('Timing-Allow-Origin', '*')
+    elif tao == 'multi_wildcard':
+    # multiple wildcards, separated by comma, pass
+        response.headers.set('Timing-Allow-Origin', '*')
+        response.headers.append('Timing-Allow-Origin', '*')
+    elif tao == 'match_origin':
+    # contains a match of origin, separated by comma, pass
+        response.headers.set('Timing-Allow-Origin', origin)
+        response.headers.append('Timing-Allow-Origin', "fake")
+    elif tao == 'match_wildcard':
+    # contains a wildcard, separated by comma, pass
+        response.headers.set('Timing-Allow-Origin', "fake")
+        response.headers.append('Timing-Allow-Origin', '*')
+    elif tao == 'uppercase':
+    # non-case-sensitive match for origin, fail
+        response.headers.set('Timing-Allow-Origin', origin.upper())
+    else:
+        pass
+    response.headers.set("Cache-Control", "no-cache, must-revalidate");
+    image_path = os.path.join(os.path.dirname(__file__), "square20.png");
+    response.content = open(image_path, mode='rb').read();
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js b/tests/wpt/web-platform-tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
index cf175eb4d3a..77f8fff5b57 100644
--- a/tests/wpt/web-platform-tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
+++ b/tests/wpt/web-platform-tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
@@ -26,6 +26,29 @@ onload = function() {
     return 'expected substring '+expected+' got '+got;
   }
 
+  function poll_for_stash(test_obj, uuid, expected) {
+    var start = new Date();
+    var poll = test_obj.step_func(function () {
+      var xhr = new XMLHttpRequest();
+      xhr.open('GET', stash_take + uuid);
+      xhr.onload = test_obj.step_func(function(e) {
+        if (xhr.response == "") {
+          if (new Date() - start > 10000) {
+            // If we set the status to TIMEOUT here we avoid a race between the
+            // page and the test timing out
+            test_obj.force_timeout();
+          }
+          test_obj.step_timeout(poll, 200);
+        } else {
+          assert_equals(xhr.response, expected);
+          test_obj.done();
+        }
+      });
+      xhr.send();
+    })
+    test_obj.step_timeout(poll, 200);
+  }
+
   // loading html (or actually svg to support <embed>)
   function test_load_nested_browsing_context(tag, attr, spec_url) {
     async_test(function() {
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html
deleted file mode 100644
index ea7e496ae8e..00000000000
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<link id=link rel=stylesheet id=style_test
-      onload="t.unreached_func('Sheet should fail to load')">
-<script>
-  var t = async_test("Check if the <link>'s error event fires for each style " +
-                     "sheet it fails to load");
-
-  link.onerror = t.step_func(() => {
-    link.onerror = t.step_func_done(() => {});
-    link.href = 'nonexistent.css?second';
-  });
-
-  link.href = 'nonexistent.css?first';
-</script>
-
-</head>
-</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html
deleted file mode 100644
index 24cd5ba7011..00000000000
--- a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<link id=link rel=stylesheet id=style_test
-      onerror="t.unreached_func('Sheet should load successfully')">
-<script>
-  var t = async_test("Check if the <link>'s load event fires for each style " +
-                     "sheet it loads");
-
-  link.onload = t.step_func(() => {
-    link.onload = t.step_func_done(() => {});
-    link.href = 'style.css?second';
-  });
-
-  link.href = 'style.css?first';
-</script>
-
-</head>
-</html>
diff --git a/tests/wpt/web-platform-tests/lifecycle/child-display-none.tentative.html b/tests/wpt/web-platform-tests/lifecycle/child-display-none.tentative.html
new file mode 100644
index 00000000000..f76b4e7b608
--- /dev/null
+++ b/tests/wpt/web-platform-tests/lifecycle/child-display-none.tentative.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Child frame marked as frozen</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+async_test((t) => {
+
+  var child = document.createElement('iframe');
+
+  var loaded = false;
+  var frozen = false;
+
+  window.addEventListener('message', t.step_func((e) => {
+    if (e.data == "load") {
+      loaded = true;
+    } else if (e.data == "freeze") {
+      assert_true(loaded);
+      frozen = true;
+      child.style = "display: block";
+    } else if (e.data == "resume") {
+      assert_true(loaded);
+      assert_true(frozen);
+      t.done();
+    }
+  }));
+
+  child.src = "resources/subframe.html";
+  document.body.appendChild(child);
+  child.style = "display: none";
+}, "Child frame frozen");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/lifecycle/resources/subframe.html b/tests/wpt/web-platform-tests/lifecycle/resources/subframe.html
new file mode 100644
index 00000000000..2f1d70a80a7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/lifecycle/resources/subframe.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+window.addEventListener('load', () => {
+  window.parent.postMessage('load');
+});
+
+document.addEventListener('freeze', () => {
+  window.parent.postMessage('freeze');
+});
+
+document.addEventListener('resume', () => {
+  window.parent.postMessage('resume');
+});
+
+</script>
diff --git a/tests/wpt/web-platform-tests/longtask-timing/supported-longtask-types.any.js b/tests/wpt/web-platform-tests/longtask-timing/supported-longtask-types.window.js
similarity index 100%
rename from tests/wpt/web-platform-tests/longtask-timing/supported-longtask-types.any.js
rename to tests/wpt/web-platform-tests/longtask-timing/supported-longtask-types.window.js
diff --git a/tests/wpt/web-platform-tests/navigation-timing/supported_navigation_type.any.js b/tests/wpt/web-platform-tests/navigation-timing/supported_navigation_type.window.js
similarity index 100%
rename from tests/wpt/web-platform-tests/navigation-timing/supported_navigation_type.any.js
rename to tests/wpt/web-platform-tests/navigation-timing/supported_navigation_type.window.js
diff --git a/tests/wpt/web-platform-tests/paint-timing/idlharness.window.js b/tests/wpt/web-platform-tests/paint-timing/idlharness.window.js
index 115af73dfc8..049f0f18f1b 100644
--- a/tests/wpt/web-platform-tests/paint-timing/idlharness.window.js
+++ b/tests/wpt/web-platform-tests/paint-timing/idlharness.window.js
@@ -19,6 +19,9 @@ idl_test(
         resolve();
       });
       observer.observe({ entryTypes: ['paint'] });
+      const div = document.createElement('div');
+      div.innerHTML = 'Hello World';
+      document.body.appendChild(div);
     });
     const timeout = new Promise((_, reject) => {
       t.step_timeout(() => reject('Timed out waiting for paint event'), 3000);
diff --git a/tests/wpt/web-platform-tests/paint-timing/supported-paint-type.any.js b/tests/wpt/web-platform-tests/paint-timing/supported-paint-type.window.js
similarity index 100%
rename from tests/wpt/web-platform-tests/paint-timing/supported-paint-type.any.js
rename to tests/wpt/web-platform-tests/paint-timing/supported-paint-type.window.js
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html
new file mode 100644
index 00000000000..a24bac864aa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method-manual.https.html
@@ -0,0 +1,95 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Manual tests for PaymentRequest.abort() method</title>
+<link rel="help" href="https://w3c.github.io/payment-request/#abort-method">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+setup({
+  explicit_done: true,
+  explicit_timeout: true,
+});
+const basicCard = Object.freeze({ supportedMethods: "basic-card" });
+const applePay = Object.freeze({
+  supportedMethods: "https://apple.com/apple-pay",
+  data: {
+    version: 3,
+    merchantIdentifier: "merchant.com.example",
+    countryCode: "US",
+    merchantCapabilities: ["supports3DS"],
+    supportedNetworks: ["visa"],
+  }
+});
+const defaultMethods = Object.freeze([basicCard, applePay]);
+const defaultDetails = Object.freeze({
+  total: {
+    label: "Total",
+    amount: {
+      currency: "USD",
+      value: "1.00",
+    },
+  },
+});
+
+function testShowSameRequestMultipleTimes() {
+  promise_test(async t => {
+    const request = new PaymentRequest(defaultMethods, defaultDetails);
+    const acceptPromise = request.show()
+    try {
+      await request.abort();
+    } catch (err) {
+      assert_unreached("Unexpected promise rejection: " + err.message);
+    }
+    await promise_rejects(t, "AbortError", acceptPromise);
+    // As request is now "closed", trying to show it will fail
+    await promise_rejects(t, "InvalidStateError", request.show());
+  }, "The same request cannot be shown multiple times.");
+}
+
+function testAbortBeforeShow() {
+  promise_test(async t => {
+    // request is in "created" state.
+    const request = new PaymentRequest(defaultMethods, defaultDetails);
+    await promise_rejects(t, "InvalidStateError", request.abort());
+    // Call it again, for good measure.
+    await promise_rejects(t, "InvalidStateError", request.abort());
+    // The request's state is "created", so let's show it
+    // which changes the state to "interactive.".
+    const acceptPromise = request.show()
+    // Let's set request the state to "closed" by calling .abort()
+    try {
+      await request.abort();
+    } catch (err) {
+      assert_unreached("Unexpected promise rejection: " + err.message);
+    }
+    // The request is now "closed", so...
+    await promise_rejects(t, "InvalidStateError", request.abort());
+    await promise_rejects(t, "AbortError", acceptPromise);
+  }, "Aborting a request before it is shown doesn't prevent it from being shown later.");
+}
+</script>
+<h2>Manual tests for PaymentRequest.abort() method</h2>
+<p>
+  Click on each button in sequence from top to bottom without refreshing the
+  page. Each button will bring up the Payment Request UI window and then will
+  close it automatically. (If a payment sheet stays open, the test has failed.)
+</p>
+<ol>
+  <li>
+    <button onclick="testShowSameRequestMultipleTimes()">
+      The same request cannot be shown multiple times.
+    </button>
+  </li>
+  <li>
+    <button onclick="testAbortBeforeShow()">
+      Aborting a request before it is shown doesn't prevent it from being shown
+      later.
+    </button>
+  </li>
+  <li><button onclick="done()">Done!</button></li>
+</ol>
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
index 75e39a011c3..cf16401d0b0 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-abort-method.https.html
@@ -1,11 +1,11 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>Test for PaymentRequest.abort() method</title>
-<link rel="help" href="https://w3c.github.io/browser-payment-api/#abort-method">
+<link rel="help" href="https://w3c.github.io/payment-request/#abort-method">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src='/resources/testdriver-vendor.js'></script>
 <script src="/resources/testdriver.js"></script>
+<script src='/resources/testdriver-vendor.js'></script>
 <script>
 "use strict";
 setup({
@@ -42,47 +42,13 @@ promise_test(async t => {
   await promise_rejects(t, "InvalidStateError", request.abort());
 }, `Throws if the promise [[state]] is not "interactive"`);
 
-promise_test(async t => {
-  const request = new PaymentRequest(defaultMethods, defaultDetails);
-  const acceptPromise = test_driver.bless("show payment request", () =>
-    request.show()
-  );
-  try {
-    await request.abort();
-  } catch (err) {
-    assert_unreached("Unexpected promise rejection: " + err.message);
-  }
-  await promise_rejects(t, "AbortError", acceptPromise);
-  // As request is now "closed", trying to show it will fail
-  await promise_rejects(t, "InvalidStateError", request.show());
-}, "The same request cannot be shown multiple times.");
-
-promise_test(async t => {
-  // request is in "created" state.
-  const request = new PaymentRequest(defaultMethods, defaultDetails);
-  await promise_rejects(t, "InvalidStateError", request.abort());
-  // Call it again, for good measure.
-  await promise_rejects(t, "InvalidStateError", request.abort());
-  // The request's state is "created", so let's show it
-  // which changes the state to "interactive.".
-  const acceptPromise = test_driver.bless("show payment request", () =>
-    request.show()
-  );
-  // Let's set request the state to "closed" by calling .abort()
-  try {
-    await request.abort();
-  } catch (err) {
-    assert_unreached("Unexpected promise rejection: " + err.message);
-  }
-  // The request is now "closed", so...
-  await promise_rejects(t, "InvalidStateError", request.abort());
-  await promise_rejects(t, "AbortError", acceptPromise);
-}, "Aborting a request before it is shown doesn't prevent it from being shown later.");
-
 promise_test(async t => {
   const request = new PaymentRequest(defaultMethods, defaultDetails);
   const promises = new Set([request.abort(), request.abort(), request.abort()]);
   assert_equals(promises.size, 3, "Must have three unique objects");
 }, "Calling abort() multiple times is always a new object.");
 </script>
-
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-multiple-show-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-multiple-show-manual.https.html
new file mode 100644
index 00000000000..cc412171a6d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-multiple-show-manual.https.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Manual test for multiple PaymentRequest.show()</title>
+<link rel="help" href="https://w3c.github.io/payment-request/#show-method">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+setup({
+  allow_uncaught_exception: true,
+});
+const defaultMethods = Object.freeze([
+  { supportedMethods: "basic-card" },
+  {
+    supportedMethods: "https://apple.com/apple-pay",
+    data: {
+      version: 3,
+      merchantIdentifier: "merchant.com.example",
+      countryCode: "US",
+      merchantCapabilities: ["supports3DS"],
+      supportedNetworks: ["visa"],
+    }
+  },
+]);
+
+const defaultDetails = Object.freeze({
+  total: {
+    label: "Total",
+    amount: {
+      currency: "USD",
+      value: "1.00",
+    },
+  },
+});
+
+function testCallingShowMultipleTimes() {
+  promise_test(async t => {
+    const request = new PaymentRequest(defaultMethods, defaultDetails);
+    const p1 = request.show();
+    const p2 = request.show();
+    const p3 = request.show();
+    const promises = new Set([p1, p2, p3]);
+    await request.abort();
+    assert_equals(promises.size, 3, "Must have three unique objects");
+    await promise_rejects(t, "AbortError", p1);
+    await promise_rejects(t, "InvalidStateError", p2);
+    await promise_rejects(t, "InvalidStateError", p3);
+  }, "Calling show() multiple times is always a new object.");
+}
+</script>
+<h2>Manual test for multiple PaymentRequest.show()</h2>
+<p>
+  Click on the button to bring up the Payment Request UI window and then will
+  close it automatically. (If a payment sheet stays open, the test has failed.)
+</p>
+<ul>
+  <li>
+    <button onclick="testCallingShowMultipleTimes()">
+      Calling show() multiple times is always a new object.
+    </button>
+  </li>
+</ul>
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-show-method-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-show-method-manual.https.html
new file mode 100644
index 00000000000..6ef98e85a60
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-show-method-manual.https.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Manual tests for PaymentRequest.show() method</title>
+<link rel="help" href="https://w3c.github.io/payment-request/#show-method">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+setup({
+  explicit_done: true,
+  explicit_timeout: true,
+});
+const defaultMethods = Object.freeze([
+  { supportedMethods: "basic-card" },
+  {
+    supportedMethods: "https://apple.com/apple-pay",
+    data: {
+      version: 3,
+      merchantIdentifier: "merchant.com.example",
+      countryCode: "US",
+      merchantCapabilities: ["supports3DS"],
+      supportedNetworks: ["visa"],
+    }
+  },
+]);
+
+const defaultDetails = Object.freeze({
+  total: {
+    label: "Total",
+    amount: {
+      currency: "USD",
+      value: "1.00",
+    },
+  },
+});
+
+function testThrowsIfStateIsNotCreated() {
+  promise_test(async t => {
+    const request = new PaymentRequest(defaultMethods, defaultDetails);
+    const acceptPromise = request.show(); // Sets state to "interactive"
+    await promise_rejects(t, "InvalidStateError", request.show());
+    await request.abort();
+    await promise_rejects(t, "AbortError", acceptPromise);
+  }, "Throws if the promise [[state]] is not 'created'.");
+}
+
+function testPaymentRequestIsShowingBoolean() {
+  promise_test(async t => {
+    const request1 = new PaymentRequest(defaultMethods, defaultDetails);
+    const request2 = new PaymentRequest(defaultMethods, defaultDetails);
+    const acceptPromise1 = request1.show();
+    const acceptPromise2 = request2.show();
+    await promise_rejects(t, "AbortError", acceptPromise2);
+    await request1.abort();
+    await promise_rejects(t, "AbortError", acceptPromise1);
+  }, `If the user agent's "payment request is showing" boolean is true, then return a promise rejected with an "AbortError" DOMException.`);
+}
+
+function testNotSupportedError() {
+  promise_test(async t => {
+    const request = new PaymentRequest(
+      [{ supportedMethods: "this-is-not-supported" }],
+      defaultDetails
+    );
+    const acceptPromise = request.show();
+    await promise_rejects(t, "NotSupportedError", acceptPromise);
+  }, `If payment method consultation produces no supported method of payment, then return a promise rejected with a "NotSupportedError" DOMException.`);
+}
+</script>
+<h2>Manual tests for PaymentRequest.show() method</h2>
+<p>
+  Click on each button in sequence from top to bottom without refreshing the
+  page. Each button will bring up the Payment Request UI window and then will
+  close it automatically. (If a payment sheet stays open, the test has failed.)
+</p>
+<ol>
+  <li>
+    <button onclick="testThrowsIfStateIsNotCreated()">
+      Throws if the promise [[state]] is not 'created'.
+    </button>
+  </li>
+  <li>
+    <button onclick="testPaymentRequestIsShowingBoolean()">
+      If the user agent's "payment request is showing" boolean is true, then return a promise rejected with an "AbortError" DOMException.
+    </button>
+  </li>
+  <li>
+    <button onclick="testNotSupportedError()">
+      If payment method consultation produces no supported method of payment, then return a promise rejected with a "NotSupportedError" DOMException.
+    </button>
+  </li>
+  <li><button onclick="done()">Done!</button></li>
+</ol>
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-request-show-method.https.html b/tests/wpt/web-platform-tests/payment-request/payment-request-show-method.https.html
index 3d362596c41..dd04987092b 100644
--- a/tests/wpt/web-platform-tests/payment-request/payment-request-show-method.https.html
+++ b/tests/wpt/web-platform-tests/payment-request/payment-request-show-method.https.html
@@ -1,11 +1,9 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>Test for PaymentRequest.show() method</title>
-<link rel="help" href="https://w3c.github.io/browser-payment-api/#show-method">
+<link rel="help" href="https://w3c.github.io/payment-request/#show-method">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
 <script>
 "use strict";
 const defaultMethods = Object.freeze([
@@ -37,51 +35,6 @@ promise_test(async t => {
   const acceptPromise = request.show();
   await promise_rejects(t, "SecurityError", acceptPromise);
 }, `Calling show() without being triggered by user interaction throws`);
-
-promise_test(t => {
-  return test_driver.bless("show payment request", async () => {
-    const request = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise = request.show(); // Sets state to "interactive"
-    await promise_rejects(t, "InvalidStateError", request.show());
-    await request.abort();
-    await promise_rejects(t, "AbortError", acceptPromise);
-  });
-}, "Throws if the promise [[state]] is not 'created'.");
-
-promise_test(t => {
-  return test_driver.bless("show payment request", async () => {
-    const request1 = new PaymentRequest(defaultMethods, defaultDetails);
-    const request2 = new PaymentRequest(defaultMethods, defaultDetails);
-    const acceptPromise1 = request1.show();
-    const acceptPromise2 = request2.show();
-    await promise_rejects(t, "AbortError", acceptPromise2);
-    await request1.abort();
-    await promise_rejects(t, "AbortError", acceptPromise1);
-  });
-}, `If the user agent's "payment request is showing" boolean is true, then return a promise rejected with an "AbortError" DOMException.`);
-
-promise_test(t => {
-  return test_driver.bless("show payment request", async () => {
-    const request = new PaymentRequest(
-      [{ supportedMethods: "this-is-not-supported" }],
-      defaultDetails
-    );
-    const acceptPromise = request.show();
-    await promise_rejects(t, "NotSupportedError", acceptPromise);
-  });
-}, `If payment method consultation produces no supported method of payment, then return a promise rejected with a "NotSupportedError" DOMException.`);
-
-promise_test(t => {
-  return test_driver.bless("show payment request", async () => {
-    const request = new PaymentRequest(
-      [{ supportedMethods: "basic-card" }],
-      defaultDetails
-    );
-    const promises = new Set([request.show(), request.show(), request.show()]);
-    await request.abort();
-    assert_equals(promises.size, 3, "Must have three unique objects");
-  });
-}, "Calling show() multiple times is always a new object.");
 </script>
 <small>
   If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
diff --git a/tests/wpt/web-platform-tests/picture-in-picture/request-picture-in-picture-twice.html b/tests/wpt/web-platform-tests/picture-in-picture/request-picture-in-picture-twice.html
index 17e494bbe88..fd8541bc1de 100644
--- a/tests/wpt/web-platform-tests/picture-in-picture/request-picture-in-picture-twice.html
+++ b/tests/wpt/web-platform-tests/picture-in-picture/request-picture-in-picture-twice.html
@@ -16,4 +16,13 @@ promise_test(async t => {
   await promise_rejects(t, 'NotAllowedError', video2.requestPictureInPicture());
   return promise;
 }, 'request Picture-in-Picture consumes user gesture');
+
+promise_test(async t => {
+  const video1 = await loadVideo();
+  const video2 = await loadVideo();
+  await test_driver.bless('request Picture-in-Picture');
+  await video1.requestPictureInPicture();
+  assert_equals(document.pictureInPictureElement, video1);
+  return video2.requestPictureInPicture();
+}, 'request Picture-in-Picture does not require user gesture if document.pictureInPictureElement is set');
 </script>
diff --git a/tests/wpt/web-platform-tests/streams/readable-streams/async-iterator.any.js b/tests/wpt/web-platform-tests/streams/readable-streams/async-iterator.any.js
new file mode 100644
index 00000000000..c59cbeb6820
--- /dev/null
+++ b/tests/wpt/web-platform-tests/streams/readable-streams/async-iterator.any.js
@@ -0,0 +1,340 @@
+// META: global=worker,jsshell
+// META: script=../resources/rs-utils.js
+// META: script=../resources/test-utils.js
+// META: script=../resources/recording-streams.js
+'use strict';
+
+test(() => {
+  assert_equals(ReadableStream.prototype[Symbol.asyncIterator], ReadableStream.prototype.getIterator);
+}, '@@asyncIterator() method is === to getIterator() method');
+
+test(() => {
+  const s = new ReadableStream();
+  const it = s.getIterator();
+  const proto = Object.getPrototypeOf(it);
+
+  const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () {}).prototype);
+  assert_equals(Object.getPrototypeOf(proto), AsyncIteratorPrototype, 'prototype should extend AsyncIteratorPrototype');
+
+  const methods = ['next', 'return'].sort();
+  assert_array_equals(Object.getOwnPropertyNames(proto).sort(), methods, 'should have all the correct methods');
+
+  for (const m of methods) {
+    const propDesc = Object.getOwnPropertyDescriptor(proto, m);
+    assert_false(propDesc.enumerable, 'method should be non-enumerable');
+    assert_true(propDesc.configurable, 'method should be configurable');
+    assert_true(propDesc.writable, 'method should be writable');
+    assert_equals(typeof it[m], 'function', 'method should be a function');
+    assert_equals(it[m].name, m, 'method should have the correct name');
+  }
+
+  assert_equals(it.next.length, 0, 'next should have no parameters');
+  assert_equals(it.return.length, 1, 'return should have 1 parameter');
+  assert_equals(typeof it.throw, 'undefined', 'throw should not exist');
+}, 'Async iterator instances should have the correct list of properties');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    },
+  });
+
+  const chunks = [];
+  for await (const chunk of s) {
+    chunks.push(chunk);
+  }
+  assert_array_equals(chunks, [1, 2, 3]);
+}, 'Async-iterating a push source');
+
+promise_test(async () => {
+  let i = 1;
+  const s = new ReadableStream({
+    pull(c) {
+      c.enqueue(i);
+      if (i >= 3) {
+        c.close();
+      }
+      i += 1;
+    },
+  });
+
+  const chunks = [];
+  for await (const chunk of s) {
+    chunks.push(chunk);
+  }
+  assert_array_equals(chunks, [1, 2, 3]);
+}, 'Async-iterating a pull source');
+
+promise_test(async () => {
+  let i = 1;
+  const s = recordingReadableStream({
+    pull(c) {
+      c.enqueue(i);
+      if (i >= 3) {
+        c.close();
+      }
+      i += 1;
+    },
+  }, new CountQueuingStrategy({ highWaterMark: 0 }));
+
+  const it = s.getIterator();
+  assert_array_equals(s.events, []);
+
+  const read1 = await it.next();
+  assert_equals(read1.done, false);
+  assert_equals(read1.value, 1);
+  assert_array_equals(s.events, ['pull']);
+
+  const read2 = await it.next();
+  assert_equals(read2.done, false);
+  assert_equals(read2.value, 2);
+  assert_array_equals(s.events, ['pull', 'pull']);
+
+  const read3 = await it.next();
+  assert_equals(read3.done, false);
+  assert_equals(read3.value, 3);
+  assert_array_equals(s.events, ['pull', 'pull', 'pull']);
+
+  const read4 = await it.next();
+  assert_equals(read4.done, true);
+  assert_equals(read4.value, undefined);
+  assert_array_equals(s.events, ['pull', 'pull', 'pull']);
+}, 'Async-iterating a pull source manually');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.error('e');
+    },
+  });
+
+  try {
+    for await (const chunk of s) {}
+    assert_unreached();
+  } catch (e) {
+    assert_equals(e, 'e');
+  }
+}, 'Async-iterating an errored stream throws');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.close();
+    }
+  });
+
+  for await (const chunk of s) {
+    assert_unreached();
+  }
+}, 'Async-iterating a closed stream never executes the loop body, but works fine');
+
+promise_test(async () => {
+  const s = new ReadableStream();
+
+  const loop = async () => {
+    for await (const chunk of s) {
+      assert_unreached();
+    }
+    assert_unreached();
+  };
+
+  await Promise.race([
+    loop(),
+    flushAsyncEvents()
+  ]);
+}, 'Async-iterating an empty but not closed/errored stream never executes the loop body and stalls the async function');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    },
+  });
+
+  const reader = s.getReader();
+  const readResult = await reader.read();
+  assert_equals(readResult.done, false);
+  assert_equals(readResult.value, 1);
+  reader.releaseLock();
+
+  const chunks = [];
+  for await (const chunk of s) {
+    chunks.push(chunk);
+  }
+  assert_array_equals(chunks, [2, 3]);
+}, 'Async-iterating a partially consumed stream');
+
+for (const type of ['throw', 'break', 'return']) {
+  for (const preventCancel of [false, true]) {
+    promise_test(async () => {
+      const s = recordingReadableStream({
+        start(c) {
+          c.enqueue(0);
+        }
+      });
+
+      // use a separate function for the loop body so return does not stop the test
+      const loop = async () => {
+        for await (const c of s.getIterator({ preventCancel })) {
+          if (type === 'throw') {
+            throw new Error();
+          } else if (type === 'break') {
+            break;
+          } else if (type === 'return') {
+            return;
+          }
+        }
+      };
+
+      try {
+        await loop();
+      } catch (e) {}
+
+      if (preventCancel) {
+        assert_array_equals(s.events, ['pull'], `cancel() should not be called`);
+      } else {
+        assert_array_equals(s.events, ['pull', 'cancel', undefined], `cancel() should be called`);
+      }
+    }, `Cancellation behavior when ${type}ing inside loop body; preventCancel = ${preventCancel}`);
+  }
+}
+
+for (const preventCancel of [false, true]) {
+  promise_test(async () => {
+    const s = recordingReadableStream({
+      start(c) {
+        c.enqueue(0);
+      }
+    });
+
+    const it = s.getIterator({ preventCancel });
+    await it.return();
+
+    if (preventCancel) {
+      assert_array_equals(s.events, [], `cancel() should not be called`);
+    } else {
+      assert_array_equals(s.events, ['cancel', undefined], `cancel() should be called`);
+    }
+  }, `Cancellation behavior when manually calling return(); preventCancel = ${preventCancel}`);
+}
+
+promise_test(async () => {
+  const s = new ReadableStream();
+  const it = s[Symbol.asyncIterator]();
+  await it.return();
+  try {
+    await it.return();
+    assert_unreached();
+  } catch (e) {}
+}, 'Calling return() twice rejects');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(0);
+      c.close();
+    },
+  });
+  const it = s[Symbol.asyncIterator]();
+  const next = await it.next();
+  assert_equals(Object.getPrototypeOf(next), Object.prototype);
+  assert_array_equals(Object.getOwnPropertyNames(next).sort(), ['done', 'value']);
+}, 'next()\'s fulfillment value has the right shape');
+
+promise_test(async t => {
+  const s = recordingReadableStream();
+  const it = s[Symbol.asyncIterator]();
+  it.next();
+
+  await promise_rejects(t, new TypeError(), it.return(), 'return() should reject');
+  assert_array_equals(s.events, ['pull']);
+}, 'calling return() while there are pending reads rejects');
+
+test(() => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(0);
+      c.close();
+    },
+  });
+  const it = s.getIterator();
+  assert_throws(new TypeError(), () => s.getIterator(), 'getIterator() should throw');
+}, 'getIterator() throws if there\'s already a lock');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    },
+  });
+
+  const chunks = [];
+  for await (const chunk of s) {
+    chunks.push(chunk);
+  }
+  assert_array_equals(chunks, [1, 2, 3]);
+
+  const reader = s.getReader();
+  await reader.closed;
+}, 'Acquiring a reader after exhaustively async-iterating a stream');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    },
+  });
+
+  // read the first two chunks, then cancel
+  const chunks = [];
+  for await (const chunk of s) {
+    chunks.push(chunk);
+    if (chunk >= 2) {
+      break;
+    }
+  }
+  assert_array_equals(chunks, [1, 2]);
+
+  const reader = s.getReader();
+  await reader.closed;
+}, 'Acquiring a reader after partially async-iterating a stream');
+
+promise_test(async () => {
+  const s = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    },
+  });
+
+  // read the first two chunks, then release lock
+  const chunks = [];
+  for await (const chunk of s.getIterator({preventCancel: true})) {
+    chunks.push(chunk);
+    if (chunk >= 2) {
+      break;
+    }
+  }
+  assert_array_equals(chunks, [1, 2]);
+
+  const reader = s.getReader();
+  const readResult = await reader.read();
+  assert_equals(readResult.done, false, 'should not be closed yet');
+  assert_equals(readResult.value, 3, 'should read remaining chunk');
+  await reader.closed;
+}, 'Acquiring a reader and reading the remaining chunks after partially async-iterating a stream with preventCancel = true');
diff --git a/tests/wpt/web-platform-tests/streams/readable-streams/brand-checks.any.js b/tests/wpt/web-platform-tests/streams/readable-streams/brand-checks.any.js
index 2906494bdf6..521e4360667 100644
--- a/tests/wpt/web-platform-tests/streams/readable-streams/brand-checks.any.js
+++ b/tests/wpt/web-platform-tests/streams/readable-streams/brand-checks.any.js
@@ -4,6 +4,7 @@
 
 let ReadableStreamDefaultReader;
 let ReadableStreamDefaultController;
+let ReadableStreamAsyncIteratorPrototype;
 
 test(() => {
 
@@ -23,6 +24,13 @@ test(() => {
 
 }, 'Can get the ReadableStreamDefaultController constructor indirectly');
 
+test(() => {
+
+  const rs = new ReadableStream();
+  ReadableStreamAsyncIteratorPrototype = Object.getPrototypeOf(rs.getIterator());
+
+}, 'Can get ReadableStreamAsyncIteratorPrototype object indirectly');
+
 function fakeRS() {
   return Object.setPrototypeOf({
     cancel() { return Promise.resolve(); },
@@ -68,6 +76,13 @@ function realRSDefaultController() {
   return controller;
 }
 
+function fakeRSAsyncIterator() {
+  return Object.setPrototypeOf({
+    next() { },
+    return(value = undefined) { }
+  }, ReadableStreamAsyncIteratorPrototype);
+}
+
 promise_test(t => {
 
   return methodRejectsForAll(t, ReadableStream.prototype, 'cancel',
@@ -157,3 +172,17 @@ test(() => {
                      [fakeRSDefaultController(), realRS(), realRSDefaultReader(), undefined, null]);
 
 }, 'ReadableStreamDefaultController.prototype.error enforces a brand check');
+
+promise_test(t => {
+
+  return methodRejectsForAll(t, ReadableStreamAsyncIteratorPrototype, 'next',
+                             [fakeRSAsyncIterator(), realRS(), realRSDefaultReader(), undefined, null]);
+
+}, 'ReadableStreamAsyncIteratorPrototype.next enforces a brand check');
+
+promise_test(t => {
+
+  return methodRejectsForAll(t, ReadableStreamAsyncIteratorPrototype, 'return',
+                             [fakeRSAsyncIterator(), realRS(), realRSDefaultReader(), undefined, null]);
+
+}, 'ReadableStreamAsyncIteratorPrototype.return enforces a brand check');
diff --git a/tests/wpt/web-platform-tests/streams/readable-streams/general.any.js b/tests/wpt/web-platform-tests/streams/readable-streams/general.any.js
index f885ed6dbcd..e9a107db1a3 100644
--- a/tests/wpt/web-platform-tests/streams/readable-streams/general.any.js
+++ b/tests/wpt/web-platform-tests/streams/readable-streams/general.any.js
@@ -39,13 +39,15 @@ test(() => {
 
 test(() => {
 
-  const methods = ['cancel', 'constructor', 'getReader', 'pipeThrough', 'pipeTo', 'tee'];
+  const methods = ['cancel', 'constructor', 'getReader', 'pipeThrough', 'pipeTo', 'tee', 'getIterator'];
   const properties = methods.concat(['locked']).sort();
+  const symbols = [Symbol.asyncIterator];
 
   const rs = new ReadableStream();
   const proto = Object.getPrototypeOf(rs);
 
-  assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties, 'should have all the correct methods');
+  assert_array_equals(Object.getOwnPropertyNames(proto).sort(), properties, 'should have all the correct properties');
+  assert_array_equals(Object.getOwnPropertySymbols(proto).sort(), symbols, 'should have all the correct symbols');
 
   for (const m of methods) {
     const propDesc = Object.getOwnPropertyDescriptor(proto, m);
@@ -70,6 +72,15 @@ test(() => {
   assert_equals(rs.pipeThrough.length, 1, 'pipeThrough should have 1 parameters');
   assert_equals(rs.pipeTo.length, 1, 'pipeTo should have 1 parameter');
   assert_equals(rs.tee.length, 0, 'tee should have no parameters');
+  assert_equals(rs.getIterator.length, 0, 'getIterator should have no required parameters');
+  assert_equals(rs[Symbol.asyncIterator].length, 0, '@@asyncIterator should have no required parameters');
+
+  const asyncIteratorPropDesc = Object.getOwnPropertyDescriptor(proto, Symbol.asyncIterator);
+  assert_false(asyncIteratorPropDesc.enumerable, '@@asyncIterator should be non-enumerable');
+  assert_true(asyncIteratorPropDesc.configurable, '@@asyncIterator should be configurable');
+  assert_true(asyncIteratorPropDesc.writable, '@@asyncIterator should be writable');
+  assert_equals(typeof rs[Symbol.asyncIterator], 'function', '@@asyncIterator should be a function');
+  assert_equals(rs[Symbol.asyncIterator].name, 'getIterator', '@@asyncIterator should have the correct name');
 
 }, 'ReadableStream instances should have the correct list of properties');
 
diff --git a/tests/wpt/web-platform-tests/streams/readable-streams/patched-global.any.js b/tests/wpt/web-platform-tests/streams/readable-streams/patched-global.any.js
index fa49249a9b5..500979f5b37 100644
--- a/tests/wpt/web-platform-tests/streams/readable-streams/patched-global.any.js
+++ b/tests/wpt/web-platform-tests/streams/readable-streams/patched-global.any.js
@@ -57,3 +57,53 @@ test(t => {
   assert_true(isReadableStream(branch1), 'branch1 should be a ReadableStream');
   assert_true(isReadableStream(branch2), 'branch2 should be a ReadableStream');
 }, 'ReadableStream tee() should not call the global ReadableStream');
+
+promise_test(async t => {
+  const rs = new ReadableStream({
+    start(c) {
+      c.enqueue(1);
+      c.enqueue(2);
+      c.enqueue(3);
+      c.close();
+    }
+  });
+
+  const oldReadableStreamGetReader = ReadableStream.prototype.getReader;
+
+  const ReadableStreamDefaultReader = (new ReadableStream()).getReader().constructor;
+  const oldDefaultReaderRead = ReadableStreamDefaultReader.prototype.read;
+  const oldDefaultReaderCancel = ReadableStreamDefaultReader.prototype.cancel;
+  const oldDefaultReaderReleaseLock = ReadableStreamDefaultReader.prototype.releaseLock;
+
+  self.ReadableStream.prototype.getReader = function() {
+    throw new Error('patched getReader() called');
+  };
+
+  ReadableStreamDefaultReader.prototype.read = function() {
+    throw new Error('patched read() called');
+  };
+  ReadableStreamDefaultReader.prototype.cancel = function() {
+    throw new Error('patched cancel() called');
+  };
+  ReadableStreamDefaultReader.prototype.releaseLock = function() {
+    throw new Error('patched releaseLock() called');
+  };
+
+  t.add_cleanup(() => {
+    self.ReadableStream.prototype.getReader = oldReadableStreamGetReader;
+
+    ReadableStreamDefaultReader.prototype.read = oldDefaultReaderRead;
+    ReadableStreamDefaultReader.prototype.cancel = oldDefaultReaderCancel;
+    ReadableStreamDefaultReader.prototype.releaseLock = oldDefaultReaderReleaseLock;
+  });
+
+  // read the first chunk, then cancel
+  for await (const chunk of rs) {
+    break;
+  }
+
+  // should be able to acquire a new reader
+  const reader = oldReadableStreamGetReader.call(rs);
+  // stream should be cancelled
+  await reader.closed;
+}, 'ReadableStream getIterator() should use the original values of getReader() and ReadableStreamDefaultReader methods');
diff --git a/tests/wpt/web-platform-tests/tools/tox.ini b/tests/wpt/web-platform-tests/tools/tox.ini
index 975056ea2c2..bb9873d5bc6 100644
--- a/tests/wpt/web-platform-tests/tools/tox.ini
+++ b/tests/wpt/web-platform-tests/tools/tox.ini
@@ -9,7 +9,7 @@ deps =
   mock
   hypothesis
 
-commands = pytest --cov {posargs}
+commands = pytest {posargs}
 
 passenv =
   HYPOTHESIS_PROFILE
diff --git a/tests/wpt/web-platform-tests/tools/wpt/tox.ini b/tests/wpt/web-platform-tests/tools/wpt/tox.ini
index 0b354e75530..d0dead55d9a 100644
--- a/tests/wpt/web-platform-tests/tools/wpt/tox.ini
+++ b/tests/wpt/web-platform-tests/tools/wpt/tox.ini
@@ -13,4 +13,4 @@ deps =
   -r{toxinidir}/../wptrunner/requirements_firefox.txt
 
 commands =
-  pytest --cov {posargs}
+  pytest {posargs}
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/tox.ini b/tests/wpt/web-platform-tests/tools/wptrunner/tox.ini
index 4f5dcfb47be..d784c5b299e 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/tox.ini
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/tox.ini
@@ -20,6 +20,6 @@ deps =
      sauce: -r{toxinidir}/requirements_sauce.txt
      servo: -r{toxinidir}/requirements_servo.txt
 
-commands = pytest {posargs:--cov}
+commands = pytest {posargs}
 
 setenv = CURRENT_TOX_ENV = {envname}
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html
new file mode 100644
index 00000000000..b69cb0e8125
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html
@@ -0,0 +1,133 @@
+<!doctype html>
+<html>
+  <head>
+    <title>
+      Test Sub-Sample Accurate Stitching of ABSNs
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script>
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {
+            label: 'buffer-stitching-1',
+            description: 'Subsample buffer stitching, same rates'
+          },
+          (task, should) => {
+            const sampleRate = 44100;
+            const bufferRate = 44100;
+            const bufferLength = 30;
+
+            // Experimentally determined thresholds.  DO NOT relax these values
+            // to far from these values to make the tests pass.
+            const errorThreshold = 9.0957e-5;
+            const snrThreshold = 85.586;
+
+            // Informative message
+            should(sampleRate, 'Test 1: context.sampleRate')
+                .beEqualTo(sampleRate);
+            testBufferStitching(sampleRate, bufferRate, bufferLength)
+                .then(resultBuffer => {
+                  const actual = resultBuffer.getChannelData(0);
+                  const expected = resultBuffer.getChannelData(1);
+                  should(
+                      actual,
+                      `Stitched sine-wave buffers at sample rate ${bufferRate}`)
+                      .beCloseToArray(
+                          expected, {absoluteThreshold: errorThreshold});
+                  const SNR = 10 * Math.log10(computeSNR(actual, expected));
+                  should(SNR, `SNR (${SNR} dB)`)
+                      .beGreaterThanOrEqualTo(snrThreshold);
+                })
+                .then(() => task.done());
+          });
+
+      audit.define(
+          {
+            label: 'buffer-stitching-2',
+            description: 'Subsample buffer stitching, different rates'
+          },
+          (task, should) => {
+            const sampleRate = 44100;
+            const bufferRate = 43800;
+            const bufferLength = 30;
+
+            // Experimentally determined thresholds.  DO NOT relax these values
+            // to far from these values to make the tests pass.
+            const errorThreshold = 3.8986e-3;
+            const snrThreshold = 65.737;
+
+            // Informative message
+            should(sampleRate, 'Test 2: context.sampleRate')
+                .beEqualTo(sampleRate);
+            testBufferStitching(sampleRate, bufferRate, bufferLength)
+                .then(resultBuffer => {
+                  const actual = resultBuffer.getChannelData(0);
+                  const expected = resultBuffer.getChannelData(1);
+                  should(
+                      actual,
+                      `Stitched sine-wave buffers at sample rate ${bufferRate}`)
+                      .beCloseToArray(
+                          expected, {absoluteThreshold: errorThreshold});
+                  const SNR = 10 * Math.log10(computeSNR(actual, expected));
+                  should(SNR, `SNR (${SNR} dB)`)
+                      .beGreaterThanOrEqualTo(snrThreshold);
+                })
+                .then(() => task.done());
+          });
+
+      audit.run();
+
+      // Create graph to test stitching of consecutive ABSNs.  The context rate
+      // is |sampleRate|, and the buffers have a fixed length of |bufferLength|
+      // and rate of |bufferRate|.  The |bufferRate| should not be too different
+      // from |sampleRate| because of interpolation of the buffer to the context
+      // rate.
+      function testBufferStitching(sampleRate, bufferRate, bufferLength) {
+        // The context for testing.  Channel 0 contains the output from
+        // stitching all the buffers together, and channel 1 contains the
+        // expected output.
+        const context = new OfflineAudioContext(
+            {numberOfChannels: 2, length: sampleRate, sampleRate: sampleRate});
+
+        const merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+
+        merger.connect(context.destination);
+
+        // The reference is a sine wave at 440 Hz.
+        const ref = new OscillatorNode(context, {frequency: 440, type: 'sine'});
+        ref.connect(merger, 0, 1);
+        ref.start();
+
+        // The test signal is a bunch of short AudioBufferSources containing
+        // bits of a sine wave.
+        let waveSignal = new Float32Array(context.length);
+        const omega = 2 * Math.PI / bufferRate * ref.frequency.value;
+        for (let k = 0; k < context.length; ++k) {
+          waveSignal[k] = Math.sin(omega * k);
+        }
+
+        // Slice the sine wave into many little buffers to be assigned to ABSNs
+        // that are started at the appropriate times to produce a final sine
+        // wave.
+        for (let k = 0; k < context.length; k += bufferLength) {
+          const buffer =
+              new AudioBuffer({length: bufferLength, sampleRate: bufferRate});
+          buffer.copyToChannel(waveSignal.slice(k, k + bufferLength), 0);
+
+          const src = new AudioBufferSourceNode(context, {buffer: buffer});
+          src.connect(merger, 0, 0);
+          src.start(k / bufferRate);
+        }
+
+        return context.startRendering();
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/resources/sub-sample-scheduling.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html
similarity index 100%
rename from tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/resources/sub-sample-scheduling.html
rename to tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-scheduling.html
diff --git a/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js b/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
index 7344fa05f65..26e30c48f36 100644
--- a/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
+++ b/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
@@ -53,7 +53,8 @@ function xr_session_promise_test(
                               testSession = session;
                               // Session must have a baseLayer or frame requests
                               // will be ignored.
-                              session.baseLayer = new XRWebGLLayer(session, gl);
+                              session.updateRenderState({
+                                  baseLayer: new XRWebGLLayer(session, gl) });
                               resolve(func(session, testDeviceController, t));
                             })
                             .catch((err) => {