diff --git a/tests/wpt/meta/FileAPI/blob/Blob-newobject.any.js.ini b/tests/wpt/meta/FileAPI/blob/Blob-newobject.any.js.ini
new file mode 100644
index 00000000000..d180ea9a78b
--- /dev/null
+++ b/tests/wpt/meta/FileAPI/blob/Blob-newobject.any.js.ini
@@ -0,0 +1,9 @@
+[Blob-newobject.any.serviceworker.html]
+  expected: ERROR
+
+[Blob-newobject.any.sharedworker.html]
+  expected: ERROR
+
+[Blob-newobject.any.html]
+
+[Blob-newobject.any.worker.html]
diff --git a/tests/wpt/meta/IndexedDB/transaction-deactivation-timing.any.js.ini b/tests/wpt/meta/IndexedDB/transaction-deactivation-timing.any.js.ini
index 3bb3235f4b5..7e35d96fb64 100644
--- a/tests/wpt/meta/IndexedDB/transaction-deactivation-timing.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/transaction-deactivation-timing.any.js.ini
@@ -16,6 +16,12 @@
   [Deactivation of new transactions happens at end of invocation]
     expected: FAIL
 
+  [New transactions are deactivated before next task]
+    expected: FAIL
+
+  [New transactions from microtask are deactivated before next task]
+    expected: FAIL
+
 
 [transaction-deactivation-timing.any.sharedworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index 22c5789da4c..ccdb22403c3 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -5877,6 +5877,13 @@
        null,
        {}
       ]
+     ],
+     "transform-scroll-child-tweak-crash.html": [
+      "4c46b6dab4f4d3584cd4a60e579acb960cd0a563",
+      [
+       null,
+       {}
+      ]
      ]
     },
     "css-transitions": {
@@ -6063,6 +6070,13 @@
        {}
       ]
      ],
+     "chrome-typed-arithmetic-crash.html": [
+      "9aa01db31fa81f35b99bf11bdbece9c66d761a97",
+      [
+       null,
+       {}
+      ]
+     ],
      "crashtests": {
       "chrome-405422528-crash.html": [
        "fcf7407b5f754aa236ddd053f67fb3a15fc6e1d9",
@@ -6182,7 +6196,7 @@
       ]
      ],
      "get-computed-style-crash.html": [
-      "38cd5af7f83d60976f9712e446a55d11fe07160e",
+      "7ea18483fd45c9df9db68b2005b0e3d7b5ad61a7",
       [
        null,
        {}
@@ -6269,6 +6283,13 @@
      ],
      "scoped": {
       "crashtests": {
+       "container-query.html": [
+        "63132582bebf4ce00045f9d74c4d670ed2812440",
+        [
+         null,
+         {}
+        ]
+       ],
        "display-inline.html": [
         "023aeff3b0b16bfd8adae249dacaf6fc2e672096",
         [
@@ -7005,6 +7026,13 @@
       null,
       {}
      ]
+    ],
+    "insert_adjacent_html-001-crash.html": [
+     "3b57aa5b0512f9bea0972427763551ff1f2b5f11",
+     [
+      null,
+      {}
+     ]
     ]
    },
    "domxpath": {
@@ -25244,13 +25272,6 @@
        ]
       },
       "the-iframe-element": {
-       "iframe_sandbox_allow_top_navigation_by_user_activation-manual.html": [
-        "0fa9de7c125c3de5599edcddf2692f1f54356c32",
-        [
-         null,
-         {}
-        ]
-       ],
        "sandbox_003-manual.htm": [
         "6363900bed15b50e4298f61e246b543a27aaf854",
         [
@@ -39382,13 +39403,13 @@
    },
    "content-security-policy": {
     "generic": {
-     "image-document-ignores-csp.html": [
-      "a3f6f64854d98d40c8c405831d6f3f9656fdf34d",
+     "image-document-ignores-csp-for-loading-main-image.tentative.html": [
+      "1e890299e4beaf49ed60664ba327003d9a15e996",
       [
        null,
        [
         [
-         "/content-security-policy/generic/image-document-ignores-csp-ref.html",
+         "/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image-ref.html",
          "=="
         ]
        ],
@@ -127070,7 +127091,7 @@
       ]
      ],
      "anchor-scroll-nested.html": [
-      "ad39224ae41e82159721f139143dfa7ca47350a6",
+      "3c14de663125013b133035c1bdb95e12aa25f3fc",
       [
        null,
        [
@@ -127919,6 +127940,19 @@
        {}
       ]
      ],
+     "pseudo-element-implicit-anchor-center.html": [
+      "e3506be354905382425528ca240072b618d3e006",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square-only.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "pseudo-element-implicit-anchor.html": [
       "a7192670cc1a7e604eb13da817ff3d1f9c5ed4db",
       [
@@ -153261,7 +153295,7 @@
       ]
      ],
      "scope-visited.html": [
-      "392aeb667b201072ff1a70aec745f75019cff54b",
+      "63a7cd40b40c0f823db82473a24ce68a64df4e40",
       [
        null,
        [
@@ -186019,7 +186053,7 @@
       ]
      ],
      "font-size-adjust-009.html": [
-      "133f96f450cd9a45cf0822a7ffc082976371dac4",
+      "8dcee7f53c8513d3f9e0f28fda1a2cc2899144da",
       [
        null,
        [
@@ -186032,7 +186066,7 @@
       ]
      ],
      "font-size-adjust-010.html": [
-      "490c7711c9a076e57beaf6d33054f2e8df05f7c7",
+      "d70119a98e46a1f904aee407196fd5d19ffff88a",
       [
        null,
        [
@@ -186061,7 +186095,7 @@
       ]
      ],
      "font-size-adjust-011.html": [
-      "3f6afd8a3708aa86d94443b8a1d8bbffe2ffef5d",
+      "cf0d620da7287cafe3c90801172c56ee87e8c301",
       [
        null,
        [
@@ -198332,6 +198366,19 @@
           ],
           {}
          ]
+        ],
+        "row-masonry-positioned-item-dynamic-change.html": [
+         "e509295c433e8cf103cf64173891cd272190af53",
+         [
+          null,
+          [
+           [
+            "/css/reference/ref-filled-green-100px-square-only.html",
+            "=="
+           ]
+          ],
+          {}
+         ]
         ]
        },
        "alignment": {
@@ -229908,7 +229955,7 @@
         {}
        ]
       ],
-      "line-clamp-035.tentative.html": [
+      "line-clamp-035.html": [
        "feb4aac618a21851ad1fb1fe8aa7a3ce80c8e045",
        [
         null,
@@ -230233,7 +230280,7 @@
         {}
        ]
       ],
-      "line-clamp-auto-025.tentative.html": [
+      "line-clamp-auto-025.html": [
        "7144be1a6e024f5f7dc42407cd8a5821632e3489",
        [
         null,
@@ -233740,6 +233787,19 @@
        {}
       ]
      ],
+     "scroll-target-group-inline-targets.html": [
+      "6a4cf05edc9f4e86f3d05c5ce6b8bba01a1bd79b",
+      [
+       null,
+       [
+        [
+         "/css/css-overflow/scroll-target-group-inline-targets-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "scrollable-overflow-empty-newline-span.html": [
       "39f72d9fbff4204a09ab9bbfe88fa2ec60da408c",
       [
@@ -247029,7 +247089,7 @@
          ]
         ],
         "shape-outside-linear-gradient-008.html": [
-         "11ae7faa36eacdb41d629784d979582a083d164f",
+         "7b6e86473befac10648d04b93bdbbdd4b78cb8cc",
          [
           null,
           [
@@ -247038,7 +247098,23 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               0,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-009.html": [
@@ -247139,7 +247215,7 @@
          ]
         ],
         "shape-outside-linear-gradient-014.html": [
-         "624884e3903b0c648be13e79557b2adf322dadd7",
+         "1d1d7aacf005d830d3e43c6987c23a0d0841156f",
          [
           null,
           [
@@ -247148,7 +247224,23 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               0,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-015.html": [
@@ -267847,6 +267939,45 @@
         {}
        ]
       ],
+      "text-autospace-002.html": [
+       "27b42dcb7a7758aecd6272133cb0962424001acf",
+       [
+        null,
+        [
+         [
+          "/css/css-text/text-autospace/text-autospace-002-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "text-autospace-003.html": [
+       "aa3af3227bac27ff45c24c4eae3e453d60dc560a",
+       [
+        null,
+        [
+         [
+          "/css/css-text/text-autospace/text-autospace-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "text-autospace-004.html": [
+       "3838a6bd5cf5c023fc579e826b83bfeceda39aa3",
+       [
+        null,
+        [
+         [
+          "/css/css-text/text-autospace/text-autospace-004-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "text-autospace-break-001.html": [
        "6e540d8f1e1feb264d0ceb6f8de2f6849b71ea37",
        [
@@ -278220,12 +278351,12 @@
        ]
       ],
       "word-spacing-002.html": [
-       "0def7e01790a885e52fc685231fbcf38df12d8bf",
+       "817aa12d9f7b8ccbe1c2948c9e01b8d87f2c28b9",
        [
         null,
         [
          [
-          "/css/css-text/word-spacing/word-spacing-001-ref.html",
+          "/css/css-text/word-spacing/word-spacing-002-ref.html",
           "=="
          ]
         ],
@@ -316714,8 +316845,21 @@
       ]
      ],
      "scoped": {
+      "active-pseudo.html": [
+       "47eefb10f0bd55eca6fd1194f1ba53bcb236c61b",
+       [
+        null,
+        [
+         [
+          "/css/css-view-transitions/scoped/content-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "display-change.html": [
-       "74428fafc7a714ed10bbbed9208a1736e82848c8",
+       "7583ac2d92874d01d19502184fe30654ed9fc11c",
        [
         null,
         [
@@ -316770,7 +316914,7 @@
        ]
       ],
       "nested-scope.html": [
-       "b9cc25c3338912ae91da453c20924dd5cc90e294",
+       "93091bc2bbef32a46b618187289577fa46c61499",
        [
         null,
         [
@@ -316783,7 +316927,7 @@
        ]
       ],
       "new-content.html": [
-       "7302f7c4f8ee4c22bee0fe286a7b2343af98603e",
+       "699cede9a469f940fbdc3758fa3b7f85680d345b",
        [
         null,
         [
@@ -316796,7 +316940,7 @@
        ]
       ],
       "old-content.html": [
-       "82b45eb75f4a2645cde3fbd7344d6d6a417ab56c",
+       "202e9698d267c10e38f54c62dc58290b52d0fd74",
        [
         null,
         [
@@ -334699,7 +334843,7 @@
       ]
      ],
      "backdrop-filter-basic-opacity-2.html": [
-      "c40e8bc09832ec6d30daa6803e98baa3141c9efe",
+      "aad7badf185373fb5d24105c48a4a6742eb9b4d4",
       [
        null,
        [
@@ -334708,7 +334852,23 @@
          "=="
         ]
        ],
-       {}
+       {
+        "fuzzy": [
+         [
+          null,
+          [
+           [
+            0,
+            1
+           ],
+           [
+            0,
+            10000
+           ]
+          ]
+         ]
+        ]
+       }
       ]
      ],
      "backdrop-filter-basic-opacity.html": [
@@ -379261,6 +379421,34 @@
            ]
           ]
          },
+         "lang_object": {
+          "lang_attribute.html": [
+           "8ee3a551eb31de947d83457f10991de6ed3125d4",
+           [
+            null,
+            [
+             [
+              "/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute-ref.html",
+              "=="
+             ]
+            ],
+            {}
+           ]
+          ],
+          "lang_color.html": [
+           "de0c838065aa6616739243600d39b1c8260d660a",
+           [
+            null,
+            [
+             [
+              "/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color-ref.html",
+              "=="
+             ]
+            ],
+            {}
+           ]
+          ]
+         },
          "not_allowed_properties.html": [
           "e66f9c0792d70f30fbda184f9604cf7069b5c0fb",
           [
@@ -380173,7 +380361,7 @@
   },
   "support": {
    ".azure-pipelines.yml": [
-    "480e89a5e27f2613886759a2a61fd93b164c72f8",
+    "fb2cf4689799603f0d2094eb338e0d8f496974b4",
     []
    ],
    ".gitattributes": [
@@ -380302,7 +380490,7 @@
      ]
     },
     "device-bound-sessions": [
-     "45686e0789fdeace4410df986f8083df033ed35c",
+     "5891f04a5a9ac4394c01aa7dee1d98ac1a7a99e7",
      []
     ],
     "idp-proxy": {
@@ -403210,6 +403398,10 @@
     "META.yml": [
      "60c95d0d579c57eee3c2c0b47004b371c24d2e56",
      []
+    ],
+    "WEB_FEATURES.yml": [
+     "5130aef74876f514b7c47a6c6fb5d1e195865913",
+     []
     ]
    },
    "contacts": {
@@ -404054,7 +404246,7 @@
       "5c580273dcfc94eff137a0ae65314bebc9b7b5c0",
       []
      ],
-     "image-document-ignores-csp-ref.html": [
+     "image-document-ignores-csp-for-loading-main-image-ref.html": [
       "e0747fd6c2810ccd771c5e33795d8c46ba56ff6c",
       []
      ],
@@ -405130,14 +405322,6 @@
       "2fa1e0ac0663a65deae6602621521cc2844b93de",
       []
      ],
-     "pass3.png": [
-      "2fa1e0ac0663a65deae6602621521cc2844b93de",
-      []
-     ],
-     "pass3.png.headers": [
-      "6581fd425ed9da6b6273d1eefb84ea9ac9ac6e53",
-      []
-     ],
      "ping.js": [
       "750ae45f969491ea29eaa47c85f96f97d94b415f",
       []
@@ -423902,7 +424086,7 @@
        []
       ],
       "anchor-scroll-nested-ref.html": [
-       "a651114868b89528b009ab9ff6fdf489fc6ac67e",
+       "a3ffbdb9b9d42c6ae12a48f8857024a2dc69aa79",
        []
       ],
       "anchor-scroll-ref.html": [
@@ -426303,6 +426487,10 @@
       []
      ],
      "margin-trim": {
+      "WEB_FEATURES.yml": [
+       "624deb93b41ec9c620010e0800e8ea4f2760bd7e",
+       []
+      ],
       "block-container-block-end-collapsed-margins-ref.html": [
        "1d2f7ff98b28adb58509753e6c1a3714fa6ffe3d",
        []
@@ -427159,7 +427347,7 @@
       []
      ],
      "scope-visited-ref.html": [
-      "91efd659216ab1de4efdfe2cac961bc6200ae62b",
+      "4d4e9faa83f1ffd47b395aea7d55b3a7f975eb14",
       []
      ],
      "support": {
@@ -433255,7 +433443,7 @@
       []
      ],
      "font-size-adjust-009-ref.html": [
-      "2ee9d0a0c8b71353293795c03a57c987e025d857",
+      "9796dda8cbc0aa622f78a9e1f2cb438704883a2b",
       []
      ],
      "font-size-adjust-012-ref.html": [
@@ -448544,6 +448732,10 @@
       "3f63ce1d2e43ff0317e78091bba126700a837a43",
       []
      ],
+     "scroll-target-group-inline-targets-ref.html": [
+      "7f3005a01ac68355ec749872a20fecae2792868d",
+      []
+     ],
      "scrollable-overflow-input-001-ref.html": [
       "151843a72c00616dfb7ad723be6b1d3435cde65b",
       []
@@ -456407,6 +456599,14 @@
        "5c231fac913a0ba8c149db5d5845e63aa5908295",
        []
       ],
+      "text-autospace-002-ref.html": [
+       "ba306130cc26bb539a90c72304b2b71745084eec",
+       []
+      ],
+      "text-autospace-004-ref.html": [
+       "f63e1593598f0d7dccbec8dbcf480e40b3b61ce4",
+       []
+      ],
       "text-autospace-break-001-ref.html": [
        "14f182842bc8e507586af6becf4a2efe84fa1939",
        []
@@ -458113,6 +458313,10 @@
        "d4cdb54d116ec7de73135c97866badacc42ba7be",
        []
       ],
+      "word-spacing-002-ref.html": [
+       "5d7be6d6b4656a481f4819bc9ff440aac6f21f2d",
+       []
+      ],
       "word-spacing-003-ref.html": [
        "58daef83ca7cbfd23b92b14f25720a75fe04e2d8",
        []
@@ -469818,7 +470022,7 @@
      []
     ],
     "session_manager.py": [
-     "ac43c929025d072d01f529c5abe78039a2a35279",
+     "78ae558c461c38812ee52cf5b065fa9c1fb91fd1",
      []
     ],
     "set_cookie.py": [
@@ -471283,6 +471487,10 @@
      "15510df7e5096b5da0b0d216b5d36b478834bf35",
      []
     ],
+    "WEB_FEATURES.yml": [
+     "0cfa44c01ef8715c4576cb7389bf361d73f304f3",
+     []
+    ],
     "resources": {
      "TAOImage.py": [
       "0e1c4814892d9a8d200d10c9ae2a3e89e3ba2c27",
@@ -475173,11 +475381,11 @@
     },
     "fetch-later": {
      "META.yml": [
-      "f8fd46bec3e7d4750c627f2fa6149f5b7b675429",
+      "4e217c63e83ba53f0f32b74338796454a1237bdc",
       []
      ],
      "README.md": [
-      "d70ad217b1c6f3f5eb315e1ab4ac83939f47b7d5",
+      "603fe05de3f9f35539189c335f61222d7c3c7800",
       []
      ],
      "permissions-policy": {
@@ -484568,10 +484776,6 @@
        ]
       },
       "drop": {
-       "001.xhtml": [
-        "c34aef97349bcccfa384b5de3b0343c7364209aa",
-        []
-       ],
        "002.xhtml": [
         "19da353097a57ecbf0ea5905402a1fd81736cfea",
         []
@@ -486259,7 +486463,7 @@
         []
        ],
        "test-helper.js": [
-        "652977c7a51631755aa4ef4e57046af21a34845a",
+        "ebc945b5f05619ebb041477096fa80e09ce629aa",
         []
        ]
       },
@@ -489967,6 +490171,10 @@
          "1efd2bd056dde80de03448a76b9bd28f94fd1795",
          []
         ],
+        "javascript_url_form_submission.html": [
+         "0d961babf0e2f11467893eacf5bebdd9b211c44f",
+         []
+        ],
         "post-origin-to-opener.html": [
          "bb625942f88c51d4eb6058586c96d574ec354e1d",
          []
@@ -490021,16 +490229,48 @@
          "50f56c6278a77e5ff80e5036c7d600d0b1fa4b91",
          []
         ],
+        "iframe-that-performs-top-navigation-child-with-user-gesture-after-failure.html": [
+         "bf9dd563409ce8b143a03d5c01d548a70b9b94af",
+         []
+        ],
+        "iframe-that-performs-top-navigation-child-with-user-gesture.html": [
+         "f7337b66e6084e9ebb38c2b72a6323bcd5ff1b11",
+         []
+        ],
+        "iframe-that-performs-top-navigation-child.html": [
+         "ffb3e4a00342c2b994ab00c4cc8e4e10bd6b7367",
+         []
+        ],
+        "iframe-that-performs-top-navigation-grandparent.sub.html": [
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         {
@@ -812318,7 +812941,7 @@
        ]
       ],
       "contracted-image.html": [
-       "dae7793f08c35a496b3458b4b68a78f158f56a4e",
+       "631627d5d117efeac0544102984dac88e29c91b2",
        [
         null,
         {
@@ -812327,7 +812950,7 @@
        ]
       ],
       "cross-origin-image.sub.html": [
-       "777dcf706406a228bd9612b51853cc445bac6b44",
+       "72cfd2fab44012a1948bff28757231662f9f3b7e",
        [
         null,
         {
@@ -812345,7 +812968,7 @@
        ]
       ],
       "expanded-image.html": [
-       "1a482b293fc568189e1917c63814dee27dbb8bdd",
+       "1b3d2f603f76d991857741ef843eecad092cedf0",
        [
         null,
         {
@@ -812354,7 +812977,7 @@
        ]
       ],
       "first-paint-equals-lcp-text.html": [
-       "b78f1a8e8bfa2796a23b9f93894bc3648dbcfe11",
+       "c14092e168c6ff409aa97a13240d526b000550a0",
        [
         null,
         {
@@ -812363,7 +812986,7 @@
        ]
       ],
       "iframe-content-not-observed.html": [
-       "4a9bf86ff49943d684dbdb17638f4afaad67aea2",
+       "629695c644b0f189b8f294ba51754537ee9bc9ab",
        [
         null,
         {
@@ -812372,7 +812995,7 @@
        ]
       ],
       "raf-loop.html": [
-       "a047d6a8fb30a429e6a4cd00fd87fd75f3458c15",
+       "0c0cd8148a070e56c6839587293c53069a65519b",
        [
         null,
         {
@@ -812483,7 +813106,7 @@
      ]
     ],
     "navigation-api-view-transition.tentative.html": [
-     "97070271c3855efb378469ca5a394dea25ad60af",
+     "bab9c1f7073bd5f9da2c05039b36fc8083d050bc",
      [
       null,
       {
@@ -812539,7 +813162,7 @@
     "smoke": {
      "tentative": {
       "almost-soft-navigation.html": [
-       "c66495be7d6c4d02166c6d4d02a3e1acdd7ecc5d",
+       "952f4ca77a860c517dcc412c30fc13d42c8bbfc7",
        [
         null,
         {
@@ -812557,7 +813180,7 @@
        ]
       ],
       "dom.html": [
-       "e663b79081e0a963a591217754e91ae0d5577d2e",
+       "201b9fb8d04f14cf6e0f8ab5240df5cd30d7f692",
        [
         null,
         {
@@ -812593,7 +813216,7 @@
        ]
       ],
       "lcp.html": [
-       "2b57e6ce19624751405a63c59454796adb3e2c9d",
+       "9979153232532e23e6534d1e3530826b3dd8d5a0",
        [
         null,
         {
@@ -813977,6 +814600,21 @@
        }
       ]
      ],
+     "cross-origin-iframe-prerender.https.html": [
+      "76ed9bf71deee6d01d82d0f435997a370a4b13fc",
+      [
+       "speculation-rules/prerender/cross-origin-iframe-prerender.https.html?target_hint=_blank",
+       {
+        "timeout": "long"
+       }
+      ],
+      [
+       "speculation-rules/prerender/cross-origin-iframe-prerender.https.html?target_hint=_self",
+       {
+        "timeout": "long"
+       }
+      ]
+     ],
      "cross-origin-iframe.https.html": [
       "0fc92fcce1c4583a39d09ef80abef7e5a804c2b8",
       [
@@ -830868,6 +831506,13 @@
        {}
       ]
      ],
+     "svgcolor-animation-invalid-value-1.html": [
+      "aa3046a50361c2d860bb237f523c98e7f5cc8c8a",
+      [
+       null,
+       {}
+      ]
+     ],
      "svgenum-animation-1.html": [
       "05b75e9ad81d5e979834ef25a42ab9f3a42f1d12",
       [
@@ -832068,6 +832713,27 @@
         {}
        ]
       ],
+      "a.type-getter-01.svg": [
+       "3486531e707f6bd00d88a1ee547c8c218dfa57d6",
+       [
+        null,
+        {}
+       ]
+      ],
+      "a.type-getter-02.svg": [
+       "ef628de940ffb19bcc5cd8068c3b9ccefa808ed4",
+       [
+        null,
+        {}
+       ]
+      ],
+      "a.type-setter-01.svg": [
+       "012b293c9da5777bb792841be6426b77e6f654d5",
+       [
+        null,
+        {}
+       ]
+      ],
       "href-animate-element.html": [
        "5220495d796a3bf6a95ff38db213cdb98aaa5a20",
        [
@@ -833104,6 +833770,20 @@
         {}
        ]
       ],
+      "text-decoration-color-computed.svg": [
+       "ffefb6aac1fb5703d64a16380254601f78fea8e4",
+       [
+        null,
+        {}
+       ]
+      ],
+      "text-decoration-fill-computed.tentative.svg": [
+       "9a37a9ea1a83509ee7ef1a24c0e98a8366d13142",
+       [
+        null,
+        {}
+       ]
+      ],
       "text-decoration-fill-invalid.svg": [
        "19da0821730d5062e006e45eadb3cd3726318302",
        [
@@ -833118,6 +833798,20 @@
         {}
        ]
       ],
+      "text-decoration-line-computed.svg": [
+       "d7ea07662f7d3235ee19e6b88752056615e98f19",
+       [
+        null,
+        {}
+       ]
+      ],
+      "text-decoration-stroke-computed.tentative.svg": [
+       "da7e9509fdf314f6f6b3cb61f6aa2c6c4dcfbd52",
+       [
+        null,
+        {}
+       ]
+      ],
       "text-decoration-stroke-invalid.svg": [
        "8d44d6f1c33898fca4a81924ba0d3e05cd3ed7d4",
        [
@@ -833131,6 +833825,13 @@
         null,
         {}
        ]
+      ],
+      "text-decoration-style-computed.svg": [
+       "6f307ff0dca3ea1f2702249b7d148c83dfe4aafa",
+       [
+        null,
+        {}
+       ]
       ]
      },
      "scripted": {
@@ -834319,13 +835020,6 @@
       {}
      ]
     ],
-    "TrustedTypePolicyFactory-blocking.tentative.html": [
-     "6ae71b69880a0313a549b586a04fa38b4be466e2",
-     [
-      null,
-      {}
-     ]
-    ],
     "TrustedTypePolicyFactory-constants.html": [
      "551084ca4b6e001ce49213a3d12491a4aedaf8f4",
      [
@@ -840332,7 +841026,7 @@
       ]
      ],
      "fallback-roles.html": [
-      "98011570b4f074bf23871a91f404e74ea6001674",
+      "320b5b7ddbd394eb6bac02863cf2575e073a5853",
       [
        null,
        {
@@ -840458,7 +841152,7 @@
       ]
      ],
      "roles.html": [
-      "844da3ce47b0f3ec55ed489b24d27f0bdfc3f380",
+      "b645a4a78b29e1a91196b1dc55eef173c334b709",
       [
        null,
        {
@@ -850987,7 +851681,7 @@
     },
     "animation-trigger": {
      "event-trigger-alternate.tentative.html": [
-      "6929c4cd38a14d67782a0dede45e9ed0059ee572",
+      "5be5738e9acffc298c36fb1db478bf5ef4b78471",
       [
        null,
        {
@@ -850996,7 +851690,7 @@
       ]
      ],
      "event-trigger-before-handlers.tentative.html": [
-      "715c5bcddfc1db1314e137d03ad3205c115bcd08",
+      "d2e9ebdadc4ebd037168e9f412fe9c805bab08e0",
       [
        null,
        {
@@ -851005,7 +851699,7 @@
       ]
      ],
      "event-trigger-once.tentative.html": [
-      "76b31373c1473f8d482fb09f72971d11283454fd",
+      "f19d0fa9adbd3098a22c6869de15ba25a01fdfa1",
       [
        null,
        {
@@ -851014,7 +851708,7 @@
       ]
      ],
      "event-trigger-repeat.tentative.html": [
-      "e54e19f1feec22b629bddee627a395a7c6260de9",
+      "0dace937f67272d930fed555d0b9a47132ba71b7",
       [
        null,
        {
@@ -851023,7 +851717,7 @@
       ]
      ],
      "event-trigger-state.tentative.html": [
-      "2bc3e6d718b829f9decb857abceb71b3fa6537ac",
+      "70a71f96182876e364509a5a1c12b560c00ae888",
       [
        null,
        {
@@ -851354,7 +852048,7 @@
      },
      "TimelineTrigger": {
       "constructor.html": [
-       "6d82c6499dc59ef8ab13ff59997164807f15e3e7",
+       "a61b659804acd6d3b5690e9e6bdb6be7bfc41b8f",
        [
         null,
         {}
@@ -853738,7 +854432,7 @@
      },
      "the-audiobuffersourcenode-interface": {
       "active-processing.https.html": [
-       "25565b7686601b23c4c920c5095b42a2a606a195",
+       "0d4b2e1fcbd8a41df558dd739a64e7f89f0a2dcc",
        [
         null,
         {}
@@ -853752,7 +854446,7 @@
        ]
       ],
       "audiobuffersource-channels.html": [
-       "f3f16c4c648166dfdb394a41881d4a515d097e86",
+       "a6aef136284d2474d9b265decfd2249797089372",
        [
         null,
         {}
@@ -853864,7 +854558,7 @@
        ]
       ],
       "sub-sample-buffer-stitching.html": [
-       "7b6fbf19775533e0c10daf1e787769e679e2fd28",
+       "052afde712db277340feea0d9b620a2596087dcb",
        [
         null,
         {}
@@ -854084,7 +854778,7 @@
      },
      "the-audioparam-interface": {
       "adding-events.html": [
-       "ab527b6695cef3f17fa2e41e6d2dc6fa1b36c32a",
+       "ad4cfc9ce064e8887eaa93b6f863857de003417a",
        [
         null,
         {}
@@ -854105,7 +854799,7 @@
        ]
       ],
       "audioparam-connect-audioratesignal.html": [
-       "b0455f86bc0f9880980c1e83fe729d5b6d698f13",
+       "61990739a79093605291c55a7afd9d98f9e8ec72",
        [
         null,
         {}
@@ -854776,7 +855470,7 @@
      },
      "the-channelmergernode-interface": {
       "active-processing.https.html": [
-       "9012526bdc64e5e62d246045465b84aef8d06f76",
+       "737462958055a85ddf9cb8bd8aa3abf852fb483c",
        [
         null,
         {}
@@ -855114,7 +855808,7 @@
        ]
       ],
       "iirfilter-getFrequencyResponse.html": [
-       "eeb4af34f7d439db5b5cba8ee449d234a495f445",
+       "467fe61881c4d0fe014dc67121bb6afdfa297e77",
        [
         null,
         {}
@@ -855231,7 +855925,7 @@
        ]
       ],
       "detune-limiting.html": [
-       "8d2ceabac43cda3c64a01d95c03e58c81b4def29",
+       "e3e6d40ed6361c553ed02d72f4cc1c1f408f0b0e",
        [
         null,
         {}
@@ -863075,7 +863769,7 @@
      ]
     ],
     "videoDecoder-codec-specific.https.any.js": [
-     "21beaa0f4b757792c8ca39e5991b1b87acdee6bc",
+     "b09ae5bbf6fd06a2567a4aed221d243b031da53a",
      [
       "webcodecs/videoDecoder-codec-specific.https.any.html?av1",
       {
@@ -880588,7 +881282,7 @@
       ]
      ],
      "tensor.https.any.js": [
-      "4b6a4ab8e7ff2c78b420b97047c31dc7695cfe4a",
+      "4c895b981575afc505fb42b0151db6b8c9406a4f",
       [
        "webnn/conformance_tests/tensor.https.any.html?cpu",
        {
@@ -898679,7 +899373,7 @@
      ]
     ],
     "RTCDataChannel-send.html": [
-     "69bdf9dbe62b0fb081b764d5f8a39b8880d3457b",
+     "bc93edce6977cbe919571b0528e17e2684f0a517",
      [
       null,
       {
@@ -946343,7 +947037,7 @@
          ]
         ],
         "start_nodes.py": [
-         "c58c05e1cde86b0ecba8900cb979d6e58dae6983",
+         "ba530d3a348d4936c317f16a8733cbc3d578a501",
          [
           null,
           {}
@@ -946366,7 +947060,7 @@
          ]
         ],
         "error.py": [
-         "c6c32b88dee99884637e308f9f5e17a3cb1cd480",
+         "d707b3bc4622558fa0cb3c5a40a32d2fbb81095a",
          [
           null,
           {}
@@ -946704,7 +947398,7 @@
        },
        "set_locale_override": {
         "contexts.py": [
-         "9f7e01deda35f8eb5e7ce183abad023bfb9e3acf",
+         "b2a2ceaecae316ca323eef5e53b248435f1c7857",
          [
           null,
           {}
@@ -946734,7 +947428,7 @@
        },
        "set_screen_orientation_override": {
         "contexts.py": [
-         "d91b4dc185e1a76ce83df7bfc591600238aa0383",
+         "df24e9a2b6869b600a156e8d0e865210fc2862c0",
          [
           null,
           {}
@@ -946748,7 +947442,7 @@
          ]
         ],
         "screen_orientation.py": [
-         "d538e9d0a2a3e258364824f9adcd00274616e08e",
+         "09309a73626d50550f1e501294db8ad3602d004b",
          [
           null,
           {}
@@ -946794,7 +947488,7 @@
        },
        "set_timezone_override": {
         "contexts.py": [
-         "6f90a9d3040de148675fa55aa12c8ef09729ca66",
+         "c71d9936d94d735f14cd0156fc87bdb6e2a0e4a5",
          [
           null,
           {}
@@ -947273,7 +947967,7 @@
        ],
        "parallel_execution": {
         "browsing_context_print.py": [
-         "65bb73c254f20b83021aa58ac19ea4ed47178c5f",
+         "429a4c6417b676ec001f3b49eb46f7981f263725",
          [
           null,
           {}
@@ -948629,6 +949323,13 @@
          {}
         ]
        ],
+       "scroll_into_view.py": [
+        "3409eb6aa7931ebeb0432ef15780e9b148d60de5",
+        [
+         null,
+         {}
+        ]
+       ],
        "user_prompts.py": [
         "5ac2052fc4e27500fd040aa88b7732a1b705aa9c",
         [
@@ -948690,7 +949391,7 @@
         ]
        ],
        "scroll_into_view.py": [
-        "1b9c671efaba12ac42a79ac0f97e84544ce9621e",
+        "6c3d26611d3ade54e9d7795cd9647fda4a3698f9",
         [
          null,
          {}
@@ -948757,7 +949458,7 @@
         ]
        ],
        "scroll_into_view.py": [
-        "af20211251a212476fa198c8e405de07349dfc54",
+        "6d1c37f8d51e75adb038e0dcd5d9e7eb6d5f337c",
         [
          null,
          {}
@@ -950069,14 +950770,21 @@
       },
       "take_element_screenshot": {
        "iframe.py": [
-        "e7f1b0c8053db0fedbb37c0a1b528a259591813f",
+        "0262fa8b1d3642d1e3628ce6420115ac3f152db5",
         [
          null,
          {}
         ]
        ],
        "screenshot.py": [
-        "fdc0d65b1d9c515701147f88261c41d37deee8b9",
+        "1fe82d474675ba05f616213d71042cc369eba6dd",
+        [
+         null,
+         {}
+        ]
+       ],
+       "scroll_into_view.py": [
+        "42249c90ac81ef804ed789126b6c3602614ca0e0",
         [
          null,
          {}
diff --git a/tests/wpt/meta/content-security-policy/generic/image-document-applies-csp.html.ini b/tests/wpt/meta/content-security-policy/generic/image-document-applies-csp.html.ini
new file mode 100644
index 00000000000..29bd20cc37d
--- /dev/null
+++ b/tests/wpt/meta/content-security-policy/generic/image-document-applies-csp.html.ini
@@ -0,0 +1,3 @@
+[image-document-applies-csp.html]
+  [Image document correctly applies CSP to other subresources.]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-cascade/scope-invalidation.html.ini b/tests/wpt/meta/css/css-cascade/scope-invalidation.html.ini
index 3160576cd9a..18a0c5ae978 100644
--- a/tests/wpt/meta/css/css-cascade/scope-invalidation.html.ini
+++ b/tests/wpt/meta/css/css-cascade/scope-invalidation.html.ini
@@ -76,3 +76,6 @@
 
   [Relative selectors set with selectorText are relative to :scope, not &]
     expected: FAIL
+
+  [Relative selectors set with selectorText are relative to :scope and &]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-cascade/scope-nesting.html.ini b/tests/wpt/meta/css/css-cascade/scope-nesting.html.ini
index 34bbf10f158..dd393a2ce9f 100644
--- a/tests/wpt/meta/css/css-cascade/scope-nesting.html.ini
+++ b/tests/wpt/meta/css/css-cascade/scope-nesting.html.ini
@@ -64,3 +64,9 @@
 
   [Mutating selectorText on outer style rule causes correct inner specificity]
     expected: FAIL
+
+  [Nesting-selector in <scope-end>]
+    expected: FAIL
+
+  [Nested nesting-selectors within scope's <stylesheet> select inclusive descendants of the scope root]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-cascade/scope-specificity.html.ini b/tests/wpt/meta/css/css-cascade/scope-specificity.html.ini
index dae34ee9f45..d26d3e633ec 100644
--- a/tests/wpt/meta/css/css-cascade/scope-specificity.html.ini
+++ b/tests/wpt/meta/css/css-cascade/scope-specificity.html.ini
@@ -58,3 +58,6 @@
 
   [@scope { & .b {  } } and :where(:scope) .b]
     expected: FAIL
+
+  [@scope (#main) { & .b {  } } and :where(#main) .b]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/parsing/color-computed-color-mix-function.html.ini b/tests/wpt/meta/css/css-color/parsing/color-computed-color-mix-function.html.ini
index 58d9beb7f58..ca025876d1a 100644
--- a/tests/wpt/meta/css/css-color/parsing/color-computed-color-mix-function.html.ini
+++ b/tests/wpt/meta/css/css-color/parsing/color-computed-color-mix-function.html.ini
@@ -127,3 +127,120 @@
 
   [Property color value 'color-mix(in display-p3-linear, color(display-p3-linear .1 .2 .3 / 25%) 0%, color(display-p3-linear 0.5 none none / 50%))']
     expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))']
+    expected: FAIL
+
+  [Property color value 'color-mix(25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))']
+    expected: FAIL
+
+  [Property color value 'color-mix(transparent, oklab(0.3 0.4 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(transparent 10%, oklab(0.3 0.4 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 0), oklab(0.3 0.4 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 0) 10%, oklab(0.3 0.4 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(white, blue)']
+    expected: FAIL
+
+  [Property color value 'color-mix(white 10%, blue)']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(none none none), oklab(none none none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(none none none), oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3), oklab(none none none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(none 0.2 0.3), oklab(0.5 none 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none 0.5 none / none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none 0.5 / none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 0.5 none / none))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none none / 0.5))']
+    expected: FAIL
+
+  [Property color value 'color-mix(oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / 0.5))']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/parsing/color-valid-color-mix-function.html.ini b/tests/wpt/meta/css/css-color/parsing/color-valid-color-mix-function.html.ini
index f605d5ddc50..356a478aea4 100644
--- a/tests/wpt/meta/css/css-color/parsing/color-valid-color-mix-function.html.ini
+++ b/tests/wpt/meta/css/css-color/parsing/color-valid-color-mix-function.html.ini
@@ -367,3 +367,132 @@
 
   [e.style['color'\] = "color-mix(in display-p3-linear, color(display-p3-linear .1 .2 .3 / none), color(display-p3-linear .5 .6 .7 / none))" should set the property value]
     expected: FAIL
+
+  [e.style['color'\] = "color-mix(hsl(120deg 10% 20%), hsl(30deg 30% 40%))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(hwb(120deg 10% 20%), hwb(30deg 30% 40%))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(lch(10 20 30), lch(50 60 70))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(oklch(0.1 20 30), oklch(0.5 60 70))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(lab(10 20 30), lab(50 60 70))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, 25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, 25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(none none none), oklab(none none none))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(none none none), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(none none none))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(none 0.2 0.3), oklab(0.5 none 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(srgb .1 .2 .3), color(srgb .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(srgb-linear .1 .2 .3), color(srgb-linear .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(display-p3 .1 .2 .3), color(display-p3 .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(display-p3-linear .1 .2 .3), color(display-p3-linear .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(a98-rgb .1 .2 .3), color(a98-rgb .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(prophoto-rgb .1 .2 .3), color(prophoto-rgb .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(rec2020 .1 .2 .3), color(rec2020 .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(xyz .1 .2 .3), color(xyz .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(xyz-d50 .1 .2 .3), color(xyz-d50 .5 .6 .7))" should set the property value]
+    expected: FAIL
+
+  [e.style['color'\] = "color-mix(color(xyz-d65 .1 .2 .3), color(xyz-d65 .5 .6 .7))" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/parsing/color-valid-relative-color.html.ini b/tests/wpt/meta/css/css-color/parsing/color-valid-relative-color.html.ini
index 2f0906a373e..7d292c6cf6d 100644
--- a/tests/wpt/meta/css/css-color/parsing/color-valid-relative-color.html.ini
+++ b/tests/wpt/meta/css/css-color/parsing/color-valid-relative-color.html.ini
@@ -742,3 +742,6 @@
 
   [e.style['color'\] = "color(from color-mix(in display-p3-linear, color(display-p3-linear 0.7 0.5 0.3), color(display-p3-linear 0.7 0.5 0.3)) display-p3-linear r g b / alpha)" should set the property value]
     expected: FAIL
+
+  [e.style['color'\] = "oklab(from color-mix(in oklab, oklab(0.25 0.2 0.5), oklab(0.25 0.2 0.5)) l a b / alpha)" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/container-for-shadow-dom.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/container-for-shadow-dom.html.ini
index 7909095df86..6edc702d8fb 100644
--- a/tests/wpt/meta/css/css-conditional/container-queries/container-for-shadow-dom.html.ini
+++ b/tests/wpt/meta/css/css-conditional/container-queries/container-for-shadow-dom.html.ini
@@ -49,3 +49,15 @@
 
   [Container name set on :host from inside a shadow tree matching query for ::slotted inside the shadow tree]
     expected: FAIL
+
+  [Should match container inside shadow tree for ::part()]
+    expected: FAIL
+
+  [Container name set inside a shadow tree should match query using ::part on the outside]
+    expected: FAIL
+
+  [Container name set inside a shadow tree should match query for host child on the outside]
+    expected: FAIL
+
+  [Container name set on :host from inside a shadow tree should match query for slotted from the outside of the shadow tree]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini b/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
index 71346ad53c0..352995a05da 100644
--- a/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
+++ b/tests/wpt/meta/css/css-fonts/generic-family-keywords-003.html.ini
@@ -37,3 +37,6 @@
 
   [@font-face matching for quoted and unquoted generic(khmer-mul) (drawing text in a canvas)]
     expected: FAIL
+
+  [@font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/grid-items/grid-auto-margin-and-replaced-item-001.html.ini b/tests/wpt/meta/css/css-grid/grid-items/grid-auto-margin-and-replaced-item-001.html.ini
new file mode 100644
index 00000000000..8c0fc3310eb
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/grid-items/grid-auto-margin-and-replaced-item-001.html.ini
@@ -0,0 +1,2 @@
+[grid-auto-margin-and-replaced-item-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html.ini b/tests/wpt/meta/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html.ini
new file mode 100644
index 00000000000..29a23e6b03f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html.ini
@@ -0,0 +1,2 @@
+[row-masonry-positioned-item-dynamic-change.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini
new file mode 100644
index 00000000000..cde2a0e459f
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html]
+  [Property grid-template-columns value '1px repeat(auto-fill, auto) 3px' computes to '10px 1px 0px 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px repeat(auto-fit, auto) 3px' computes to '10px 1px 0px 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px' computes to '10px 1px [a\] 0px 0px [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px' computes to '10px 1px [a\] 0px 0px [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px' computes to '10px 1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px' computes to '10px 1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]' computes to '10px [a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]' computes to '10px [a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%' computes to '10px 1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%' computes to '10px 1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]' computes to '10px [a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]' computes to '10px [a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini
new file mode 100644
index 00000000000..b86f92237c9
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html]
+  [Property grid-template-columns value '1px repeat(auto-fill, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px repeat(auto-fit, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini
new file mode 100644
index 00000000000..24fb8c47eff
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini
@@ -0,0 +1,24 @@
+[grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html]
+  [Property grid-template-columns value 'repeat(auto-fill, auto)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'repeat(auto-fit, [one\] auto)']
+    expected: FAIL
+
+  [Property grid-template-columns value 'repeat(auto-fill, min-content [two\])']
+    expected: FAIL
+
+  [Property grid-template-columns value 'repeat(auto-fit, [three\] max-content [four\])']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 21px [b\] repeat(auto-fill, [c\] 22px [d\] auto [e\]) [f\] 24px [g\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 21px [b c\] repeat(auto-fill, [d e\] 22px [f g h\] fit-content(200px) [i j k l\]) [m n\] 24px [o\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] repeat(2, [b\] 20px [c d\] 21px [e f g\]) [h i\] repeat(auto-fit, [j\] auto [k l m\] min-content [n o p q\]) [r s\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[one\] repeat(2, minmax(50px, auto)) [two\] 30px [three\] repeat(auto-fill, auto) 40px [four five\] repeat(2, minmax(200px, auto)) [six\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html.ini
new file mode 100644
index 00000000000..cf4643e3529
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-columns-intrinsic-auto-repeat-computed.tentative.html]
+  [Property grid-template-columns value '1px repeat(auto-fill, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px repeat(auto-fit, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-columns value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
+
+  [Property grid-template-columns value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini
new file mode 100644
index 00000000000..69e339926e2
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html]
+  [Property grid-template-rows value '1px repeat(auto-fill, auto) 3px' computes to '1px 0px 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px repeat(auto-fit, auto) 3px' computes to '1px 0px 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px' computes to '1px [a\] 0px 0px [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px' computes to '1px [a\] 0px 0px [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px' computes to '1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px' computes to '1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]' computes to '[a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]' computes to '[a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%' computes to '1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%' computes to '1px [a b\] 0px [c d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]' computes to '[a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]' computes to '[a\] 1px 0px [b\] 0px 4px [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini
new file mode 100644
index 00000000000..6874eb982d1
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html]
+  [Property grid-template-rows value '1px repeat(auto-fill, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px repeat(auto-fit, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini
new file mode 100644
index 00000000000..40c634b0098
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html.ini
@@ -0,0 +1,24 @@
+[grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html]
+  [Property grid-template-rows value 'repeat(auto-fill, auto)']
+    expected: FAIL
+
+  [Property grid-template-rows value 'repeat(auto-fit, [one\] auto)']
+    expected: FAIL
+
+  [Property grid-template-rows value 'repeat(auto-fill, min-content [two\])']
+    expected: FAIL
+
+  [Property grid-template-rows value 'repeat(auto-fit, [three\] max-content [four\])']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 21px [b\] repeat(auto-fill, [c\] 22px [d\] auto [e\]) [f\] 24px [g\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 21px [b c\] repeat(auto-fill, [d e\] 22px [f g h\] fit-content(200px) [i j k l\]) [m n\] 24px [o\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] repeat(2, [b\] 20px [c d\] 21px [e f g\]) [h i\] repeat(auto-fit, [j\] auto [k l m\] min-content [n o p q\]) [r s\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[one\] repeat(2, minmax(50px, auto)) [two\] 30px [three\] repeat(auto-fill, auto) 40px [four five\] repeat(2, minmax(200px, auto)) [six\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html.ini b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html.ini
new file mode 100644
index 00000000000..83e8244239a
--- /dev/null
+++ b/tests/wpt/meta/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html.ini
@@ -0,0 +1,36 @@
+[grid-template-rows-intrinsic-auto-repeat-computed.tentative.html]
+  [Property grid-template-rows value '1px repeat(auto-fill, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px repeat(auto-fit, auto) 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, min-content max-content) [b\] 4px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fill, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '1px [a\] repeat(auto-fit, [b\] fit-content(200px) [c\]) [d\] 3px']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fill, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1px repeat(auto-fit, auto [b\] auto) 4px [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fill, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-rows value '100% [a\] repeat(auto-fit, [b\] min-content [c\]) [d\] 300%']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fill, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
+
+  [Property grid-template-rows value '[a\] 1em repeat(auto-fit, max-content [b\] auto) 4em [d\]']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-mixins/parameters.html.ini b/tests/wpt/meta/css/css-mixins/parameters.html.ini
new file mode 100644
index 00000000000..b543aff4e9f
--- /dev/null
+++ b/tests/wpt/meta/css/css-mixins/parameters.html.ini
@@ -0,0 +1,15 @@
+[parameters.html]
+  [Mixins with invalid parameter lists are ignored]
+    expected: FAIL
+
+  [Basic mixin parameter passing]
+    expected: FAIL
+
+  [Mixins can be called multiple times with different parameters]
+    expected: FAIL
+
+  [Mixin argument parsing with arguments wrapped in {}]
+    expected: FAIL
+
+  [Defaults in mixin parameters]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.html.ini
new file mode 100644
index 00000000000..9a349f53fca
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-035.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.tentative.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.tentative.html.ini
deleted file mode 100644
index 9ac9b876d1e..00000000000
--- a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-035.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[line-clamp-035.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.html.ini
new file mode 100644
index 00000000000..ee5317d88cc
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.html.ini
@@ -0,0 +1,2 @@
+[line-clamp-auto-025.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.tentative.html.ini b/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.tentative.html.ini
deleted file mode 100644
index c1786082c26..00000000000
--- a/tests/wpt/meta/css/css-overflow/line-clamp/line-clamp-auto-025.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[line-clamp-auto-025.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-overflow/scroll-target-group-inline-targets.html.ini b/tests/wpt/meta/css/css-overflow/scroll-target-group-inline-targets.html.ini
new file mode 100644
index 00000000000..59de8c09962
--- /dev/null
+++ b/tests/wpt/meta/css/css-overflow/scroll-target-group-inline-targets.html.ini
@@ -0,0 +1,2 @@
+[scroll-target-group-inline-targets.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-autospace/text-autospace-002.html.ini b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-002.html.ini
new file mode 100644
index 00000000000..67a09bd1f61
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-002.html.ini
@@ -0,0 +1,2 @@
+[text-autospace-002.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-autospace/text-autospace-003.html.ini b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-003.html.ini
new file mode 100644
index 00000000000..043dbd0f365
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-003.html.ini
@@ -0,0 +1,2 @@
+[text-autospace-003.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-autospace/text-autospace-004.html.ini b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-004.html.ini
new file mode 100644
index 00000000000..4e3c5852466
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-004.html.ini
@@ -0,0 +1,2 @@
+[text-autospace-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/word-spacing/word-spacing-002.html.ini b/tests/wpt/meta/css/css-text/word-spacing/word-spacing-002.html.ini
deleted file mode 100644
index 8c45b2ab5ea..00000000000
--- a/tests/wpt/meta/css/css-text/word-spacing/word-spacing-002.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[word-spacing-002.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/form-associated/form-disabled-callback.html.ini b/tests/wpt/meta/custom-elements/form-associated/form-disabled-callback.html.ini
new file mode 100644
index 00000000000..bf6e43f58f7
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/form-associated/form-disabled-callback.html.ini
@@ -0,0 +1,3 @@
+[form-disabled-callback.html]
+  [A disabled form-associated custom element should not submit an entry for it]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-basic.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-basic.html.ini
index 90229a76024..7a0b8fbba9b 100644
--- a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-basic.html.ini
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-basic.html.ini
@@ -4,3 +4,6 @@
 
   [Tests FormControlRange default values when no form control is set.]
     expected: FAIL
+
+  [FormControlRange handles empty value correctly.]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-offset.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-offset.html.ini
new file mode 100644
index 00000000000..f32b53fee48
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-offset.html.ini
@@ -0,0 +1,33 @@
+[FormControlRange-offset.html]
+  [FormControlRange with single character in textarea.]
+    expected: FAIL
+
+  [FormControlRange with empty control in textarea.]
+    expected: FAIL
+
+  [FormControlRange boundary positions in textarea.]
+    expected: FAIL
+
+  [FormControlRange with Unicode characters in textarea.]
+    expected: FAIL
+
+  [FormControlRange with single character in input.]
+    expected: FAIL
+
+  [FormControlRange with empty control in input.]
+    expected: FAIL
+
+  [FormControlRange boundary positions in input.]
+    expected: FAIL
+
+  [FormControlRange with Unicode characters in input.]
+    expected: FAIL
+
+  [FormControlRange preserves whitespace in textarea light DOM.]
+    expected: FAIL
+
+  [FormControlRange should work correctly with weirdly formed light DOM structure.]
+    expected: FAIL
+
+  [FormControlRange ignores malformed input child nodes.]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-range-updates.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-range-updates.html.ini
new file mode 100644
index 00000000000..8bfb16f6262
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-range-updates.html.ini
@@ -0,0 +1,15 @@
+[FormControlRange-range-updates.html]
+  [FormControlRange allows updating range on same element.]
+    expected: FAIL
+
+  [FormControlRange can switch between different form controls.]
+    expected: FAIL
+
+  [FormControlRange works with disconnected and then connected form controls.]
+    expected: FAIL
+
+  [FormControlRange can switch between connected and disconnected form controls.]
+    expected: FAIL
+
+  [FormControlRange reflects value changes on same element.]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-supported-elements.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-supported-elements.html.ini
new file mode 100644
index 00000000000..d0ac1a3b617
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-supported-elements.html.ini
@@ -0,0 +1,18 @@
+[FormControlRange-supported-elements.html]
+  [FormControlRange should support textarea.]
+    expected: FAIL
+
+  [FormControlRange should support input[type=text\].]
+    expected: FAIL
+
+  [FormControlRange should support input[type=search\].]
+    expected: FAIL
+
+  [FormControlRange should support input[type=password\].]
+    expected: FAIL
+
+  [FormControlRange should support input[type=url\].]
+    expected: FAIL
+
+  [FormControlRange should support input[type=tel\].]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-toString.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-toString.html.ini
new file mode 100644
index 00000000000..d48e0f75705
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-toString.html.ini
@@ -0,0 +1,15 @@
+[FormControlRange-toString.html]
+  [FormControlRange toString() reflects current value.]
+    expected: FAIL
+
+  [FormControlRange toString() clamps to available length.]
+    expected: FAIL
+
+  [FormControlRange toString() handles value shorter than range.]
+    expected: FAIL
+
+  [FormControlRange toString() handles auto-collapsed backwards ranges.]
+    expected: FAIL
+
+  [FormControlRange uses current input.value, not value attribute.]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-unsupported-elements.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-unsupported-elements.html.ini
new file mode 100644
index 00000000000..ad76fcb5a14
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-unsupported-elements.html.ini
@@ -0,0 +1,12 @@
+[FormControlRange-unsupported-elements.html]
+  [FormControlRange throws NotSupportedError for text node.]
+    expected: FAIL
+
+  [FormControlRange should throw NotSupportedError for all unsupported HTML5 elements.]
+    expected: FAIL
+
+  [FormControlRange should throw NotSupportedError for unsupported input types.]
+    expected: FAIL
+
+  [NotSupportedError should take precedence over IndexSizeError when both element type and index are invalid for a FormControlRange.]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/ranges/tentative/FormControlRange-validation.html.ini b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-validation.html.ini
new file mode 100644
index 00000000000..846e18d3643
--- /dev/null
+++ b/tests/wpt/meta/dom/ranges/tentative/FormControlRange-validation.html.ini
@@ -0,0 +1,6 @@
+[FormControlRange-validation.html]
+  [FormControlRange preserves state when setFormControlRange throws.]
+    expected: FAIL
+
+  [FormControlRange handles all range types correctly: forward, backwards, and out-of-bounds.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/anonymous-iframe/indexeddb.tentative.https.window.js.ini b/tests/wpt/meta/html/anonymous-iframe/indexeddb.tentative.https.window.js.ini
index 299e647ff1a..2491f9cd5a1 100644
--- a/tests/wpt/meta/html/anonymous-iframe/indexeddb.tentative.https.window.js.ini
+++ b/tests/wpt/meta/html/anonymous-iframe/indexeddb.tentative.https.window.js.ini
@@ -1,4 +1,4 @@
 [indexeddb.tentative.https.window.html]
-  expected: TIMEOUT
+  expected: CRASH
   [indexeddb]
     expected: TIMEOUT
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/008.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/008.html.ini
new file mode 100644
index 00000000000..c253f779d78
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/008.html.ini
@@ -0,0 +1,3 @@
+[008.html]
+  [Link with onclick form submit to javascript url and href navigation ]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
new file mode 100644
index 00000000000..3e07e6b7d1f
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
@@ -0,0 +1,6 @@
+[empty-iframe-load-event.html]
+  [Check execution order from nested timeout]
+    expected: FAIL
+
+  [Check execution order on load handler]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
index 02a8e91ea04..d5f4fa2f799 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-nosrc.html.ini
@@ -2,8 +2,5 @@
   [window.open]
     expected: FAIL
 
-  [link click]
-    expected: FAIL
-
   [form submission]
     expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
index 324db3d9b35..5aef7ce66ce 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
@@ -10,3 +10,6 @@
 
   [load event does not fire on window.open('about:blank?foo')]
     expected: FAIL
+
+  [load event does not fire on window.open('about:blank')]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
new file mode 100644
index 00000000000..60a4fa51f8a
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
@@ -0,0 +1,3 @@
+[a-click.html]
+  [aElement.click() before the load event must NOT replace]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini b/tests/wpt/meta/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
deleted file mode 100644
index 675ea8a1458..00000000000
--- a/tests/wpt/meta/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[canvas.2d.disconnected-font-size-math.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html.ini
index fdc27d37788..830aeb8ae48 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html.ini
@@ -1,6 +1,7 @@
 [autofocus-dialog.html]
+  expected: TIMEOUT
   [<dialog> can contain autofocus, without stopping page autofocus content from working]
     expected: FAIL
 
   [<dialog>-contained autofocus element gets focused when the dialog is shown]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
index 0cfee719c4e..9e6f4115b8c 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
@@ -1,7 +1,6 @@
 [document-with-fragment-empty.html]
-  expected: TIMEOUT
   [Autofocus elements in iframed documents with empty fragments should work.]
     expected: FAIL
 
   [Autofocus elements in top-level browsing context's documents with empty fragments should work.]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html.ini
new file mode 100644
index 00000000000..fd3197be293
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html.ini
@@ -0,0 +1,6 @@
+[iframe_javascript_url_xhr.html]
+  [Image load should not trigger load event for non-initial javascript URL load]
+    expected: FAIL
+
+  [Load event for initial javascript URL load should be fired after script execution]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 8822f4daba6..bbc1f35d8d9 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_nonescaping-1.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 1ae1c2cc134..90c8bd71ded 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,4 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index ff6467094b8..a24e565bbce 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/form-submission-0/text-plain.window.js.ini b/tests/wpt/meta/html/semantics/forms/form-submission-0/text-plain.window.js.ini
index 9ad31fef5b7..a28daea7396 100644
--- a/tests/wpt/meta/html/semantics/forms/form-submission-0/text-plain.window.js.ini
+++ b/tests/wpt/meta/html/semantics/forms/form-submission-0/text-plain.window.js.ini
@@ -181,3 +181,6 @@
 
   [text/plain: 0x00 in name (normal form)]
     expected: FAIL
+
+  [text/plain: Basic test (normal form)]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/the-fieldset-element/disabled-003.html.ini b/tests/wpt/meta/html/semantics/forms/the-fieldset-element/disabled-003.html.ini
deleted file mode 100644
index 5983b46a9ab..00000000000
--- a/tests/wpt/meta/html/semantics/forms/the-fieldset-element/disabled-003.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[disabled-003.html]
-  expected: CRASH
diff --git a/tests/wpt/meta/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml.ini b/tests/wpt/meta/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml.ini
new file mode 100644
index 00000000000..dc5c25bbd20
--- /dev/null
+++ b/tests/wpt/meta/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml.ini
@@ -0,0 +1,3 @@
+[xml-stylesheet-blocking.xhtml]
+  [xml-stylesheet blocks script execution and rendering]
+    expected: FAIL
diff --git a/tests/wpt/meta/shadow-dom/shadow-style-invalidation-vw-units.html.ini b/tests/wpt/meta/shadow-dom/shadow-style-invalidation-vw-units.html.ini
deleted file mode 100644
index d79a6a7d952..00000000000
--- a/tests/wpt/meta/shadow-dom/shadow-style-invalidation-vw-units.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[shadow-style-invalidation-vw-units.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html.ini b/tests/wpt/meta/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html.ini
deleted file mode 100644
index 7453be794fc..00000000000
--- a/tests/wpt/meta/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-[TrustedTypePolicyFactory-blocking.tentative.html]
-  [Block Trusted Type policy creation by event listener.]
-    expected: FAIL
-
-  [Trusted Type policy creation.]
-    expected: FAIL
-
-  [Block only default Trusted Type policy creation.]
-    expected: FAIL
-
-  [Policy creation called before addEventListener function will not reached the listener.]
-    expected: FAIL
diff --git a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
index 23bae76e37e..fd4161c07f2 100644
--- a/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
+++ b/tests/wpt/meta/trusted-types/trusted-types-navigation.html.ini
@@ -50,18 +50,14 @@
 
 
 [trusted-types-navigation.html?31-35]
-  expected: TIMEOUT
-  [Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.]
-    expected: TIMEOUT
-
   [Navigate a window via form-submission with javascript:-urls w/ a default policy throwing an exception in enforcing mode.]
-    expected: NOTRUN
+    expected: FAIL
 
   [Navigate a window via form-submission with javascript:-urls w/ a default policy throwing an exception in report-only mode.]
-    expected: NOTRUN
+    expected: FAIL
 
   [Navigate a window via form-submission with javascript:-urls w/ a default policy making the URL invalid in enforcing mode.]
-    expected: NOTRUN
+    expected: FAIL
 
   [Navigate a frame via form-submission with javascript:-urls in report-only mode.]
     expected: FAIL
@@ -76,23 +72,23 @@
   [Navigate a frame via form-submission with javascript:-urls in enforcing mode.]
     expected: FAIL
 
-  [Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.]
+  [Navigate a window via form-submission with javascript:-urls in report-only mode.]
     expected: FAIL
 
 
 [trusted-types-navigation.html?06-10]
-  expected: CRASH
+  expected: TIMEOUT
   [Navigate a frame via anchor with javascript:-urls in report-only mode.]
     expected: FAIL
 
   [Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in enforcing mode.]
-    expected: FAIL
+    expected: NOTRUN
 
   [Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in report-only mode.]
-    expected: FAIL
+    expected: NOTRUN
 
 
 [trusted-types-navigation.html?11-15]
@@ -154,3 +150,6 @@
 
   [Navigate a frame via anchor with javascript:-urls in enforcing mode.]
     expected: FAIL
+
+  [Navigate a window via anchor with javascript:-urls in report-only mode.]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html.ini
index 0d13de13275..9ef3c968552 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html.ini
@@ -1,3 +1,6 @@
 [active-processing.https.html]
   [Executing "Setup graph"]
     expected: FAIL
+
+  [Setup graph with AudioWorklet and AudioBufferSourceNode]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/adding-events.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/adding-events.html.ini
index 8bc33bf77cc..c3c8e001646 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/adding-events.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioparam-interface/adding-events.html.ini
@@ -4,3 +4,9 @@
 
   [Executing "expoRamp"]
     expected: FAIL
+
+  [linearRamp: Insert linearRamp after running for some time]
+    expected: FAIL
+
+  [exponentialRamp: Insert exponentialRamp after running for some time]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html.ini
index 289b1049eed..2bb2c5802d2 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html.ini
@@ -4,3 +4,9 @@
 
   [Executing "test"]
     expected: FAIL
+
+  [initialize: AudioWorklet module loading]
+    expected: FAIL
+
+  [test: Active processing emits expected channel-count changes]
+    expected: FAIL
diff --git a/tests/wpt/meta/webdriver/tests/classic/perform_actions/navigation.py.ini b/tests/wpt/meta/webdriver/tests/classic/perform_actions/navigation.py.ini
deleted file mode 100644
index de6a7b8b5f8..00000000000
--- a/tests/wpt/meta/webdriver/tests/classic/perform_actions/navigation.py.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[navigation.py]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini b/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini
new file mode 100644
index 00000000000..3c21fb97f05
--- /dev/null
+++ b/tests/wpt/meta/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py.ini
@@ -0,0 +1,3 @@
+[scroll_into_view.py]
+  [test_scroll_into_view]
+    expected: FAIL
diff --git a/tests/wpt/meta/webxr/render_state_update.https.html.ini b/tests/wpt/meta/webxr/render_state_update.https.html.ini
new file mode 100644
index 00000000000..0e57356683e
--- /dev/null
+++ b/tests/wpt/meta/webxr/render_state_update.https.html.ini
@@ -0,0 +1,2 @@
+[render_state_update.https.html]
+  expected: ERROR
diff --git a/tests/wpt/tests/.azure-pipelines.yml b/tests/wpt/tests/.azure-pipelines.yml
index 480e89a5e27..fb2cf468979 100644
--- a/tests/wpt/tests/.azure-pipelines.yml
+++ b/tests/wpt/tests/.azure-pipelines.yml
@@ -158,7 +158,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   variables:
     HYPOTHESIS_PROFILE: ci
   steps:
@@ -177,7 +177,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -194,7 +194,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -211,7 +211,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -228,7 +228,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   # full checkout required
   - task: UsePythonVersion@0
@@ -250,7 +250,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   # full checkout required
   - task: UsePythonVersion@0
@@ -274,10 +274,10 @@ jobs:
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_stable'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_stable']))
   strategy:
-    parallel: 8 # chosen to make runtime ~2h
+    parallel: 10 # chosen to make runtime ~2h
   timeoutInMinutes: 180
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -310,10 +310,10 @@ jobs:
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_dev'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_dev']))
   strategy:
-    parallel: 8 # chosen to make runtime ~2h
+    parallel: 10 # chosen to make runtime ~2h
   timeoutInMinutes: 180
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -324,6 +324,7 @@ jobs:
   - template: tools/ci/azure/install_edge.yml
     parameters:
       channel: dev
+  - template: tools/ci/azure/configure_watson.yml
   - template: tools/ci/azure/update_hosts.yml
   - template: tools/ci/azure/update_manifest.yml
   - script: python ./wpt run --yes --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel dev edge
@@ -346,10 +347,10 @@ jobs:
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_canary'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_canary']))
   strategy:
-    parallel: 8 # chosen to make runtime ~2h
+    parallel: 10 # chosen to make runtime ~2h
   timeoutInMinutes: 180
   pool:
-    vmImage: 'windows-2019'
+    vmImage: 'windows-latest'
   steps:
   - task: UsePythonVersion@0
     inputs:
diff --git a/tests/wpt/tests/.well-known/device-bound-sessions b/tests/wpt/tests/.well-known/device-bound-sessions
index 45686e0789f..5891f04a5a9 100644
--- a/tests/wpt/tests/.well-known/device-bound-sessions
+++ b/tests/wpt/tests/.well-known/device-bound-sessions
@@ -21,5 +21,5 @@ def main(request, response):
         response_body = {
             "provider_origin": provider_origin,
         }
-    return (200, [('Content-Type', 'application/json'), ('Set-Cookie', 'well_known_fetched=true; Path=/device-bound-session-credentials')],
+    return (200, [('Content-Type', 'application/json')],
             json.dumps(response_body))
diff --git a/tests/wpt/tests/FileAPI/blob/Blob-newobject.any.js b/tests/wpt/tests/FileAPI/blob/Blob-newobject.any.js
new file mode 100644
index 00000000000..e036c3a9a74
--- /dev/null
+++ b/tests/wpt/tests/FileAPI/blob/Blob-newobject.any.js
@@ -0,0 +1,12 @@
+// META: title=Blob methods return new objects ([NewObject])
+// META: global=window,worker
+'use strict';
+
+['stream', 'text', 'arrayBuffer', 'bytes'].forEach(method => {
+  test(() => {
+    const blob = new Blob(['PASS']);
+    const a = blob[method]();
+    const b = blob[method]();
+    assert_not_equals(a, b, `Blob.${method}() must return a new object`);
+  }, `Blob.${method}() returns [NewObject]`);
+});
diff --git a/tests/wpt/tests/console/WEB_FEATURES.yml b/tests/wpt/tests/console/WEB_FEATURES.yml
new file mode 100644
index 00000000000..5130aef7487
--- /dev/null
+++ b/tests/wpt/tests/console/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: console
+  files: "**"
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-body-with-child-img.html b/tests/wpt/tests/container-timing/tentative/containertiming-body-with-child-img.html
index 53e9bc55074..ae5f552c2a6 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-body-with-child-img.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-body-with-child-img.html
@@ -26,16 +26,14 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('id', 'img_id');
-      document.body.appendChild(img);
-      beforeRender = performance.now();
-    };
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('id', 'img_id');
+    document.body.appendChild(img);
+
+    beforeRender = performance.now();
   }, 'Body with containertiming observed reports children image paints.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-img-itself.html b/tests/wpt/tests/container-timing/tentative/containertiming-img-itself.html
index 6d55532a419..70b66a0b564 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-img-itself.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-img-itself.html
@@ -25,17 +25,15 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('containertiming', 'image_ct');
-      img.setAttribute('id', 'my_id');
-      document.body.appendChild(img);
-      beforeRender = performance.now();
-    };
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('containertiming', 'image_ct');
+    img.setAttribute('id', 'my_id');
+    document.body.appendChild(img);
+
+    beforeRender = performance.now();
   }, 'Element with containertiming attribute is observable and reports the image paint.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
index 4ceb38afd7d..a6d56db6561 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-with-buffering.html
@@ -27,17 +27,15 @@ body {
       );
       observer.observe({type: 'container', buffered: true });
     }, 2000);
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('containertiming', 'image_ct');
-      img.setAttribute('id', 'my_id');
-      document.body.appendChild(img);
-      beforeRender = performance.now();
-    };
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('containertiming', 'image_ct');
+    img.setAttribute('id', 'my_id');
+    document.body.appendChild(img);
+
+    beforeRender = performance.now();
   }, 'Paint is reported when observation starts after image paint if buffering is enabled.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
index 0191b2ee758..8544ffd995e 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-observe-after-paint-without-buffering.html
@@ -12,7 +12,6 @@ body {
 <script src="/container-timing/resources/container-timing-helpers.js"></script>
 <script src="/element-timing/resources/element-timing-helpers.js"></script>
 <script>
-  let beforeRender;
   async_test(function (t) {
     assert_implements(window.PerformanceContainerTiming, "PerformanceContainerTiming is not implemented");
     t.step_timeout(() => {
@@ -26,17 +25,13 @@ body {
         t.done();
       }, 2000);
     }, 2000);
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('containertiming', 'image_ct');
-      img.setAttribute('id', 'my_id');
-      document.body.appendChild(img);
-      beforeRender = performance.now();
-    };
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('containertiming', 'image_ct');
+    img.setAttribute('id', 'my_id');
+    document.body.appendChild(img);
   }, 'containertiming does not report paints before observing if buffering is disabled.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-observe-no-paint.html b/tests/wpt/tests/container-timing/tentative/containertiming-observe-no-paint.html
index f2384248255..36d7cc1d13a 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-observe-no-paint.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-observe-no-paint.html
@@ -20,17 +20,14 @@ body {
       }
     );
     observer.observe({entryTypes: ['container']});
-    t.step_timeout(() => {
-      t.done();
-    }, 2000);
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      const div = document.createElement('div');
-      div.setAttribute('containertiming', 'div_ct');
-      document.body.appendChild(div);
-      beforeRender = performance.now();
-    };
+
+    finishOnElementTiming(t);
+
+    const div = document.createElement('div');
+    div.setAttribute('containertiming', 'div_ct');
+    document.body.appendChild(div);
+
+    addPaintingElementTimingAfterDoubleRAF(document.body);
   }, 'Container timing did not report paints when there was nothing to paint.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-text-itself.html b/tests/wpt/tests/container-timing/tentative/containertiming-text-itself.html
index bead4d1724b..d0a0f17d38d 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-text-itself.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-text-itself.html
@@ -23,16 +23,14 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the text during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      const p = document.createElement('p');
-      p.setAttribute('containertiming', 'p_ct');
-      p.id = 'my_id';
-      p.innerText = "This is a text";
-      document.body.appendChild(p);
-      beforeRender = performance.now();
-    };
+
+    const p = document.createElement('p');
+    p.setAttribute('containertiming', 'p_ct');
+    p.id = 'my_id';
+    p.innerText = "This is a text";
+    document.body.appendChild(p);
+
+    beforeRender = performance.now();
   }, 'Element with containertiming attribute is observable and reports the text paint.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-two-overlapping-imgs.html b/tests/wpt/tests/container-timing/tentative/containertiming-two-overlapping-imgs.html
index 1a36c6f2532..dbeb971a1c6 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-two-overlapping-imgs.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-two-overlapping-imgs.html
@@ -26,31 +26,28 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add a div that is the container timing root
-      const div = document.createElement('div');
-      div.setAttribute('containertiming', 'div_ct');
-      document.body.appendChild(div);
 
-      // Add two overlapping images
-      const img1 = document.createElement('img');
-      img1.src = '/container-timing/resources/square100.png';
-      img1.setAttribute('id', 'img1_id');
-      img1.style.position = 'absolute';
-      div.appendChild(img1);
+    // Add a div that is the container timing root
+    const div = document.createElement('div');
+    div.setAttribute('containertiming', 'div_ct');
+    document.body.appendChild(div);
 
-      const img2 = document.createElement('img');
-      img2.src = '/container-timing/resources/square100.png';
-      img2.setAttribute('id', 'img2_id');
-      img2.style.marginLeft = '50px';
-      img2.style.marginTop = '50px';
-      img2.style.position = 'absolute';
-      div.appendChild(img2);
+    // Add two overlapping images
+    const img1 = document.createElement('img');
+    img1.src = '/container-timing/resources/square100.png';
+    img1.setAttribute('id', 'img1_id');
+    img1.style.position = 'absolute';
+    div.appendChild(img1);
 
-      beforeRender = performance.now();
-    };
+    const img2 = document.createElement('img');
+    img2.src = '/container-timing/resources/square100.png';
+    img2.setAttribute('id', 'img2_id');
+    img2.style.marginLeft = '50px';
+    img2.style.marginTop = '50px';
+    img2.style.position = 'absolute';
+    div.appendChild(img2);
+
+    beforeRender = performance.now();
   }, 'Overlapping images report to containertiming.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-with-child-img.html b/tests/wpt/tests/container-timing/tentative/containertiming-with-child-img.html
index 03f0e113902..f8e59362664 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-with-child-img.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-with-child-img.html
@@ -25,20 +25,19 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add a div that is the container timing root
-      const div = document.createElement('div');
-      div.setAttribute('containertiming', 'div_ct');
-      document.body.appendChild(div);
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('id', 'img_id');
-      div.appendChild(img);
-      beforeRender = performance.now();
-    };
+
+    // Add a div that is the container timing root
+    const div = document.createElement('div');
+    div.setAttribute('containertiming', 'div_ct');
+    document.body.appendChild(div);
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('id', 'img_id');
+    div.appendChild(img);
+
+    beforeRender = performance.now();
   }, 'Paint of the image child of container timing is reported.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/containertiming-with-child-text.html b/tests/wpt/tests/container-timing/tentative/containertiming-with-child-text.html
index 1efc189c34e..b856b527ccd 100644
--- a/tests/wpt/tests/container-timing/tentative/containertiming-with-child-text.html
+++ b/tests/wpt/tests/container-timing/tentative/containertiming-with-child-text.html
@@ -23,20 +23,18 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the text during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add a div that is the container timing root
-      const div = document.createElement('div');
-      div.setAttribute('containertiming', 'div_ct');
-      document.body.appendChild(div);
 
-      const p = document.createElement('p');
-      p.id = 'p_id';
-      p.innerText = "This is a text";
-      div.appendChild(p);
-      beforeRender = performance.now();
-    };
+    // Add a div that is the container timing root
+    const div = document.createElement('div');
+    div.setAttribute('containertiming', 'div_ct');
+    document.body.appendChild(div);
+
+    const p = document.createElement('p');
+    p.id = 'p_id';
+    p.innerText = "This is a text";
+    div.appendChild(p);
+
+    beforeRender = performance.now();
   }, 'Paint of the text child of container timing is reported.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/img-not-child-of-container-timing.html b/tests/wpt/tests/container-timing/tentative/img-not-child-of-container-timing.html
index 751342a7ceb..08f3c7c687a 100644
--- a/tests/wpt/tests/container-timing/tentative/img-not-child-of-container-timing.html
+++ b/tests/wpt/tests/container-timing/tentative/img-not-child-of-container-timing.html
@@ -21,23 +21,20 @@ body {
     );
     observer.observe({entryTypes: ['container']});
 
-    // Wait 2 seconds for observations, then finish successfully
-    t.step_timeout(() => {
-      t.done();
-    }, 2000);
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add a div that is the container timing root
-      const div = document.createElement('div');
-      div.setAttribute('containertiming', 'div_ct');
-      document.body.appendChild(div);
-      // Add image of width equal to 100 and height equal to 100.
-      const img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('id', 'img_id');
-      document.body.appendChild(img);
-    };
+    finishOnElementTiming(t);
+
+    // Add a div that is the container timing root
+    const div = document.createElement('div');
+    div.setAttribute('containertiming', 'div_ct');
+    document.body.appendChild(div);
+
+    // Add image of width equal to 100 and height equal to 100.
+    const img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('id', 'img_id');
+    document.body.appendChild(img);
+
+    addPaintingElementTimingAfterDoubleRAF(document.body);
   }, 'Containertiming observed without paintable contents and an image outside does not report observations.');
 </script>
 
diff --git a/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img.html b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img.html
index de51aa4ffef..9a81d7d18ec 100644
--- a/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img.html
+++ b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img.html
@@ -25,26 +25,24 @@ body {
       })
     );
     observer.observe({entryTypes: ['container']});
-    // Add the image during onload to be sure that the observer is registered
-    // in time.
-    window.onload = () => {
-      // Add a div that is the container timing root
-      const div1 = document.createElement('div');
-      div1.setAttribute('containertiming', 'div1_ct');
-      document.body.appendChild(div1);
 
-      // Add another div, child of the first, that is also a container root
-      const div2 = document.createElement('div');
-      div2.setAttribute('containertiming', 'div2_ct');
-      div1.appendChild(div2);
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    document.body.appendChild(div1);
 
-      // Add image of width equal to 100 and height equal to 100.
-      img = document.createElement('img');
-      img.src = '/container-timing/resources/square100.png';
-      img.setAttribute('id', 'img_id');
-      div2.appendChild(img);
-      beforeRender = performance.now();
-    };
+    // Add another div, child of the first, that is also a container root
+    const div2 = document.createElement('div');
+    div2.setAttribute('containertiming', 'div2_ct');
+    div1.appendChild(div2);
+
+    // Add image of width equal to 100 and height equal to 100.
+    img = document.createElement('img');
+    img.src = '/container-timing/resources/square100.png';
+    img.setAttribute('id', 'img_id');
+    div2.appendChild(img);
+
+    beforeRender = performance.now();
   }, 'A parent containertiming root with default nesting policy does not get paints from children containertiming roots.');
 </script>
 
diff --git a/tests/wpt/tests/content-security-policy/generic/image-document-applies-csp.html b/tests/wpt/tests/content-security-policy/generic/image-document-applies-csp.html
new file mode 100644
index 00000000000..78a8f8e9f3d
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/generic/image-document-applies-csp.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<meta charset="utf-8">
+<head>
+  <title>CSP header applied to image document</title>
+  <link rel="help" href="https://github.com/servo/servo/issues/38180">
+  <script src='/resources/testharness.js'></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+  <iframe id="iframe" src="../support/pass.png?pipe=header(Content-Security-Policy,default-src 'none')"></iframe>
+  <script>
+    let iframe = document.getElementById("iframe");
+    promise_test(async t => {
+      await t.step_wait(() => {
+        return iframe.contentDocument.querySelector("img") !== null;
+      }, "Wait for image document to be loaded", 5000, 100);
+      return new Promise((resolve, reject) => {
+        let newImg = iframe.contentDocument.createElement("img");
+        newImg.onload = reject;
+        newImg.onerror = resolve;
+        newImg.src = "../support/fail.png";
+        iframe.contentDocument.body.appendChild(newImg);
+      });
+    }, "Image document correctly applies CSP to other subresources.");
+  </script>
+</body>
diff --git a/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-ref.html b/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image-ref.html
similarity index 100%
rename from tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-ref.html
rename to tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image-ref.html
diff --git a/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image.tentative.html b/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image.tentative.html
new file mode 100644
index 00000000000..1e890299e4b
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp-for-loading-main-image.tentative.html
@@ -0,0 +1,7 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSP header ignored for image in image document</title>
+<link rel="help" href="https://github.com/servo/servo/issues/38180">
+<link rel='match' href='image-document-ignores-csp-for-loading-main-image-ref.html'>
+<link rel="author" title="Josh Matthews" href="mailto:josh@joshmatthews.net">
+<iframe src="../support/pass.png?pipe=header(Content-Security-Policy,default-src 'none')">
diff --git a/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp.html b/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp.html
deleted file mode 100644
index a3f6f64854d..00000000000
--- a/tests/wpt/tests/content-security-policy/generic/image-document-ignores-csp.html
+++ /dev/null
@@ -1,7 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>CSP header ignored for image document</title>
-<link rel="help" href="https://github.com/servo/servo/issues/38180">
-<link rel='match' href='image-document-ignores-csp-ref.html'>
-<link rel="author" title="Josh Matthews" href="mailto:josh@joshmatthews.net">
-<iframe src="../support/pass3.png">
diff --git a/tests/wpt/tests/content-security-policy/support/pass3.png b/tests/wpt/tests/content-security-policy/support/pass3.png
deleted file mode 100644
index 2fa1e0ac066..00000000000
Binary files a/tests/wpt/tests/content-security-policy/support/pass3.png and /dev/null differ
diff --git a/tests/wpt/tests/content-security-policy/support/pass3.png.headers b/tests/wpt/tests/content-security-policy/support/pass3.png.headers
deleted file mode 100644
index 6581fd425ed..00000000000
--- a/tests/wpt/tests/content-security-policy/support/pass3.png.headers
+++ /dev/null
@@ -1 +0,0 @@
-Content-Security-Policy: default-src 'none'
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html b/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
index d65936ad862..2b21634be94 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-name-inline-001.html
@@ -19,14 +19,6 @@
 .abspos {
   position: absolute;
 }
-.columns {
-  column-count: 2;
-  column-fill: auto;
-  column-gap: 10px;
-  column-width: 100px;
-  width: 210px;
-  height: 100px;
-}
 .anchor {
   anchor-name: --a1;
   background: orange;
@@ -38,8 +30,8 @@
   background: lime;
 }
 </style>
-<body onload="checkLayoutForAnchorPos('.target')">
-  <div class="container relpos xcolumns">
+<body>
+  <div class="container relpos">
     <div style="height: 150px"></div>
     <div class="relpos">
       <span class="target" data-expected-width=20></span>
@@ -55,4 +47,7 @@
       <span class="target" data-expected-width=30></span>
     </div>
   </div>
+  <script>
+  document.fonts.ready.then(() => checkLayoutForAnchorPos('.target'));
+  </script>
 </body>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-nested.html b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-nested.html
index ad39224ae41..3c14de66312 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-nested.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-nested.html
@@ -1,5 +1,6 @@
 <!DOCTYPE html>
 <html class="reftest-wait">
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <title>Tests anchor positioning with nested scroll containers</title>
 <link rel="author" href="mailto:xiaochengh@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
diff --git a/tests/wpt/tests/css/css-anchor-position/chrome-443261872.html b/tests/wpt/tests/css/css-anchor-position/chrome-443261872.html
new file mode 100644
index 00000000000..29f2876825b
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/chrome-443261872.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<title>Chrome bug 443261872: style attribute invalidation for tree-scoped anchor-name</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position/#name">
+<link rel="help" href="https://crbug.com/443261872">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+</style>
+<div id="host">
+  <template shadowrootmode="open">
+    <style>
+      #anchor {
+        width: 100px;
+        height: 100px;
+      }
+      #anchored {
+        position-anchor: --panel-anchor;
+        position: absolute;
+        inset: anchor(top) anchor(right) anchor(bottom) anchor(left);
+      }
+    </style>
+    <div id="anchor" style="anchor-name:--panel-anchor; color:yellow"></div>
+    <div id="anchored"></div>
+  </template>
+</div>
+<script>
+  test(() => {
+    const anchor = host.shadowRoot.querySelector("#anchor");
+    const anchored = host.shadowRoot.querySelector("#anchored");
+    anchored.offsetTop;
+    anchor.style.color = "pink";
+    assert_equals(anchored.offsetWidth, 100);
+  }, "Changing inline style color does not change tree-scope for anchor-name");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html
new file mode 100644
index 00000000000..51ed84fd3ad
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/container-queries/anchored-fallback-position-area-any.tentative.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<title>CSS Conditional Test: @container anchored(fallback) matching 'any' &lt;position-area&gt;</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12610">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<style>
+  #anchor {
+    anchor-name: --a;
+    width: 100px;
+    height: 100px;
+  }
+  #anchored {
+    position: absolute;
+    position-anchor: --a;
+    position-area: top;
+    position-try-fallbacks: span-bottom;
+    width: 100px;
+    /* Too tall to fit over the anchor to trigger fallback */
+    height: 100px;
+    container-type: anchored;
+  }
+  #target {
+    @container anchored(fallback: any) { --any: yes; }
+    @container anchored(fallback: any span-bottom) { --any-span-bottom: yes; }
+    @container anchored(fallback: span-end any) { --span-end-any: yes; }
+    @container anchored(fallback: any span-all) { --any-span-all: yes; }
+  }
+</style>
+<div id="anchor"></div>
+<div id="anchored">
+  <div id="target"></div>
+</div>
+<script>
+  test(() => {
+    const style = getComputedStyle(target);
+    assert_equals(style.getPropertyValue("--any"), "yes");
+    assert_equals(style.getPropertyValue("--any-span-bottom"), "yes");
+    assert_equals(style.getPropertyValue("--span-end-any"), "yes");
+    assert_equals(style.getPropertyValue("--any-span-all"), "yes");
+  }, "@container anchored(fallback: <position-area>) querying 'any'");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html b/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html
new file mode 100644
index 00000000000..b4582e11a15
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/container-queries/at-container-anchored-parsing-any.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS Conditional Test: @container anchored query parsing - 'any' position-area</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12610">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
+<div style="container-name:name;container-type:anchored">
+  <main id="cq-main"></main>
+</div>
+<script>
+  test_cq_condition_known('anchored(fallback: any)');
+  test_cq_condition_known('anchored(fallback: any any)');
+  test_cq_condition_known('anchored(fallback: any top)');
+  test_cq_condition_known('anchored(fallback: center any)');
+  test_cq_condition_known('anchored(fallback: any self-start)');
+  test_cq_condition_known('anchored(fallback: inline-end any)');
+
+  test_cq_condition_unknown('anchored(fallback: any none)');
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/pseudo-element-implicit-anchor-center.html b/tests/wpt/tests/css/css-anchor-position/pseudo-element-implicit-anchor-center.html
new file mode 100644
index 00000000000..e3506be3549
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/pseudo-element-implicit-anchor-center.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<title>CSS Anchor Positioning: Originating element implicit anchor for pseudo elements using anchor-center</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#implicit">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
+<style>
+  #anchor {
+    display: flow-root;
+    margin-left: -50px;
+    margin-top: -50px;
+    width: 200px;
+    height: 200px;
+  }
+  #anchor::after {
+    content: "";
+    position: absolute;
+    width: 100px;
+    height: 100px;
+    background: green;
+    /* Should be centered inside #anchor */
+    place-self: anchor-center;
+  }
+  #ref {
+    margin-left: 50px;
+    margin-top: 50px;
+    width: 100px;
+    height: 100px;
+    background-color: red;
+  }
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div id="wrapper">
+  <div id="anchor">
+    <div id="ref"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-nested-ref.html b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-nested-ref.html
index a651114868b..a3ffbdb9b9d 100644
--- a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-nested-ref.html
+++ b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-nested-ref.html
@@ -1,5 +1,6 @@
 <!DOCTYPE html>
 <title>Tests anchor positioned scrolling with nested scroll containers</title>
+<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
 <link rel="author" href="mailto:xiaochengh@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
 <style>
diff --git a/tests/wpt/tests/css/css-box/margin-trim/WEB_FEATURES.yml b/tests/wpt/tests/css/css-box/margin-trim/WEB_FEATURES.yml
new file mode 100644
index 00000000000..624deb93b41
--- /dev/null
+++ b/tests/wpt/tests/css/css-box/margin-trim/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: margin-trim
+  files: "**"
diff --git a/tests/wpt/tests/css/css-cascade/scope-invalidation.html b/tests/wpt/tests/css/css-cascade/scope-invalidation.html
index 86c06f19a2d..78af1c2469a 100644
--- a/tests/wpt/tests/css/css-cascade/scope-invalidation.html
+++ b/tests/wpt/tests/css/css-cascade/scope-invalidation.html
@@ -861,12 +861,9 @@ test_scope_invalidation(document.currentScript, () => {
   assert_green(c);
   let scope_rule = main.querySelector('style').sheet.cssRules[1];
   assert_true(scope_rule instanceof CSSScopeRule);
-  // Note: relative selectors imply a :where(:scope) selector to the left,
-  // which is observably different from an implicit '&' selector through
-  // specificity.
   scope_rule.cssRules[0].selectorText = '> .b'; /* Still (0, 1, 0) */
-  scope_rule.cssRules[1].selectorText = '& > .c'; /* (0, 3, 0) */
+  scope_rule.cssRules[1].selectorText = '& > .c'; /* Still (0, 1, 0) */
   assert_green(b);
-  assert_red(c);
-}, 'Relative selectors set with selectorText are relative to :scope, not &');
+  assert_green(c);
+}, 'Relative selectors set with selectorText are relative to :scope and &');
 </script>
diff --git a/tests/wpt/tests/css/css-cascade/scope-nesting.html b/tests/wpt/tests/css/css-cascade/scope-nesting.html
index 146a3f4ae28..3412dcdd4d4 100644
--- a/tests/wpt/tests/css/css-cascade/scope-nesting.html
+++ b/tests/wpt/tests/css/css-cascade/scope-nesting.html
@@ -2,6 +2,7 @@
 <title>@scope - nesting (&)</title>
 <link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scope-atrule">
 <link rel="help" href="https://drafts.csswg.org/css-nesting-1/#nest-selector">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9740">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <main id=main></main>
@@ -9,12 +10,18 @@
 <template id=test_nest_scope_end>
   <div>
     <style>
-      @scope (.a) to (& > &) {
-        * { z-index:1; }
+      /* (& > .b) behaves like (:where(:scope) > .b), due & mapping to :where(:scope).*/
+      @scope (.a) to (& > .b) {
+        :scope { z-index:1; }
+      }
+
+      /* Should not match, since <scope-end> refers to the scope itself. */
+      @scope (.a) to (.b&) {
+        :scope { z-index:42; }
       }
     </style>
-    <div class=a> <!-- This scope is limited by the element below. -->
-      <div class=a> <!-- This scope is limited by its own root. -->
+    <div class="a b">
+      <div class=b>
         <div id=below></div>
       </div>
     </div>
@@ -25,7 +32,10 @@
 test((t) => {
   t.add_cleanup(() => main.replaceChildren());
   main.append(test_nest_scope_end.content.cloneNode(true));
-
+  let a = document.querySelector('.a');
+  let b = document.querySelector('.a > .b');
+  assert_equals(getComputedStyle(a).zIndex, '1');
+  assert_equals(getComputedStyle(b).zIndex, 'auto');
   assert_equals(getComputedStyle(below).zIndex, 'auto');
   assert_equals(getComputedStyle(outside).zIndex, 'auto');
 }, 'Nesting-selector in <scope-end>');
@@ -97,16 +107,16 @@ test((t) => {
 <template id=test_inner_nest>
   <div>
     <style>
-      @scope (.a) {
-        & + & {
-          z-index:1;
+      @scope (#div) {
+        & {
+          z-index: 1;
+          & {
+            z-index: 2;
+          }
         }
       }
     </style>
-    <div class=a>
-      <div id=inner1 class=a></div>
-      <div id=inner2 class=a></div>
-    </div>
+    <div id=div></div>
   </div>
 </template>
 <script>
@@ -114,9 +124,8 @@ test((t) => {
   t.add_cleanup(() => main.replaceChildren());
   main.append(test_inner_nest.content.cloneNode(true));
 
-  assert_equals(getComputedStyle(inner1).zIndex, 'auto');
-  assert_equals(getComputedStyle(inner2).zIndex, '1');
-}, 'Nesting-selector in the scope\'s <stylesheet>');
+  assert_equals(getComputedStyle(div).zIndex, '2');
+}, 'Nested nesting-selectors within scope\'s <stylesheet> select inclusive descendants of the scope root');
 </script>
 
 <template id=test_parent_in_pseudo_scope>
@@ -227,38 +236,6 @@ test((t) => {
 }, 'Parent pseudo class within scope-start');
 </script>
 
-<template id=test_parent_pseudo_in_nested_scope_end>
-  <div>
-    <style>
-      .a {
-        /* Note that & in <scope-end> refers to <scope-start>,
-           not the outer style rule. */
-        @scope (&.b) to (&.c) {
-           :scope, * { z-index: 1; }
-        }
-      }
-    </style>
-    <div class="a b">
-      <div class="a c">
-        <div class="a b c">
-        </div>
-      </div>
-    </div>
-  </div>
-</template>
-<script>
-test((t) => {
-  t.add_cleanup(() => main.replaceChildren());
-  main.append(test_parent_pseudo_in_nested_scope_end.content.cloneNode(true));
-
-  let ab = document.querySelector('.a.b:not(.c)');
-  let ac = document.querySelector('.a.c:not(.b)');
-  let abc = document.querySelector('.a.b.c');
-  assert_equals(getComputedStyle(ab).zIndex, '1');
-  assert_equals(getComputedStyle(ac).zIndex, '1');
-  assert_equals(getComputedStyle(abc).zIndex, 'auto', 'limit element is not in scope');
-}, 'Parent pseudo class within scope-end');
-</script>
 
 <template id=test_parent_pseudo_in_nested_scope_body>
   <div>
@@ -621,7 +598,12 @@ test((t) => {
   main.append(test_insert_ampersand_rule_within_scope.content.cloneNode(true));
   assert_equals(getComputedStyle(child).color, 'rgb(255, 0, 0)');
   let scope_rule = main.querySelector('style').sheet.cssRules[0].cssRules[0];
-  scope_rule.insertRule('& #child { color: green; }');
+  // & does not add specificity - inserting it up front does nothing...
+  scope_rule.insertRule('& #child { color: green; }', 0);
+  assert_equals(getComputedStyle(child).color, 'rgb(255, 0, 0)');
+  scope_rule.deleteRule(0);
+  // ... But inserting it at the end makes it win by order of appearance.
+  scope_rule.insertRule('& #child { color: green; }', scope_rule.cssRules.length);
   assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
 }, 'Insert a nested style rule within @scope, &');
 </script>
diff --git a/tests/wpt/tests/css/css-cascade/scope-specificity.html b/tests/wpt/tests/css/css-cascade/scope-specificity.html
index 8541e0d6371..63e3bc4ce95 100644
--- a/tests/wpt/tests/css/css-cascade/scope-specificity.html
+++ b/tests/wpt/tests/css/css-cascade/scope-specificity.html
@@ -79,15 +79,14 @@ test_scope_specificity(['@scope (#main) to (.b)', '.a'], '.a');
 test_scope_specificity(['@scope (#main, .foo, .bar)', '#a'], '#a');
 test_scope_specificity(['@scope (#main)', 'div.b'], 'div.b');
 test_scope_specificity(['@scope (#main)', ':scope .b'], '.a .b');
-// Inherit the specificity of the scope-start selector.
-test_scope_specificity(['@scope (#main)', '& .b'], '#main .b');
+// & behaves like :where(:scope) - No specificity is added.
+// See https://github.com/w3c/csswg-drafts/issues/9740
+test_scope_specificity(['@scope (#main)', '& .b'], ':where(#main) .b');
 test_scope_specificity(['@scope (#main)', 'div .b'], 'div .b');
 test_scope_specificity(['@scope (#main)', '@scope (.a)', '.b'], '.b');
 // Explicit `:scope` adds specficity.
 test_scope_specificity(['@scope (#main)', ':scope .b'], ':scope .b');
-// Using & in scoped style with implicit scope root matches the same elements
-// as `:scope`, but does not add any specificity.
-// https://github.com/w3c/csswg-drafts/issues/10196
+// & behaves like :where(:scope), even for implicit scope roots.
 test_scope_specificity(['@scope', '& .b'], ':where(:scope) .b', styleImplicit);
 // Using relative selector syntax does not add specificity
 test_scope_specificity(['@scope (#main)', '> .a'], ':where(#main) > .a');
diff --git a/tests/wpt/tests/css/css-cascade/scope-visited-ref.html b/tests/wpt/tests/css/css-cascade/scope-visited-ref.html
index 91efd659216..4d4e9faa83f 100644
--- a/tests/wpt/tests/css/css-cascade/scope-visited-ref.html
+++ b/tests/wpt/tests/css/css-cascade/scope-visited-ref.html
@@ -91,6 +91,8 @@
   // Insert inner <a> with JS, since the parser can't produce this result.
   let inner_a = document.createElement('a');
   inner_a.setAttribute('href', '');
+  inner_a.setAttribute('class', 'with_class_inner');
+  inner_a.setAttribute('style', 'color: green');
   inner_a.textContent = 'Visited2';
   outer_visited.append(inner_a);
 </script>
diff --git a/tests/wpt/tests/css/css-cascade/scope-visited.html b/tests/wpt/tests/css/css-cascade/scope-visited.html
index 392aeb667b2..63a7cd40b40 100644
--- a/tests/wpt/tests/css/css-cascade/scope-visited.html
+++ b/tests/wpt/tests/css/css-cascade/scope-visited.html
@@ -186,7 +186,7 @@
   <template shadowrootmode=open>
     <main>
       Main
-      <a href="">
+      <a href="" class="with_class_outer">
         Visited1
       </a>
     </main>
@@ -198,6 +198,17 @@
       @scope (:visited) {
         :scope > :visited { background-color: coral; }
       }
+      @scope (:visited) {
+        :visited > :scope { background-color: lightgrey; }
+      }
+      @scope(.with_class_inner) {
+        :visited > :scope { color: yellow;  }
+      }
+
+      /* Should match */
+      @scope(.with_class_outer) {
+        :scope > :visited { color: green; }
+      }
     </style>
   </template>
 </div>
@@ -207,8 +218,10 @@
     // Insert the inner :visited link with JS, since the parser
     // can't produce this.
     let outer_a = visited_in_visited.shadowRoot.querySelector('main > a');
+
     let inner_a = document.createElement('a');
     inner_a.setAttribute('href', '');
+    inner_a.setAttribute('class', 'with_class_inner');
     inner_a.textContent = 'Visited2';
     outer_a.append(inner_a);
   }
diff --git a/tests/wpt/tests/css/css-color/parsing/color-computed-color-mix-function.html b/tests/wpt/tests/css/css-color/parsing/color-computed-color-mix-function.html
index 28e574aa85e..a2085247378 100644
--- a/tests/wpt/tests/css/css-color/parsing/color-computed-color-mix-function.html
+++ b/tests/wpt/tests/css/css-color/parsing/color-computed-color-mix-function.html
@@ -444,50 +444,53 @@
     fuzzy_test_computed_color(`color-mix(in lab, lab(10 20 30 / 25%) 0%, lab(50 none none / 0.5))`, `lab(50 20 30 / 0.5)`);
 
     // oklab()
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`, `oklab(0.4 0.5 0.6)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `oklab(0.4 0.5 0.6)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))`, `oklab(0.2 0.3 0.4)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)`, `oklab(0.2 0.3 0.4)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)`, `oklab(0.4 0.5 0.6)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`, `oklab(0.4 0.5 0.6)`); // Scale down > 100% sum.
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`, `oklab(0.4 0.5 0.6 / 0.5)`); // Scale up < 100% sum, causes alpha multiplication.
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`, `oklab(0.5 0.6 0.7)`);
+    // Absence of colorspace means OKLab.
+    for (const colorSpace of ["", "in oklab, "]) {
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`, `oklab(0.4 0.5 0.6)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `oklab(0.4 0.5 0.6)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))`, `oklab(0.2 0.3 0.4)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)`, `oklab(0.2 0.3 0.4)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)`, `oklab(0.4 0.5 0.6)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`, `oklab(0.4 0.5 0.6)`); // Scale down > 100% sum.
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`, `oklab(0.4 0.5 0.6 / 0.5)`); // Scale up < 100% sum, causes alpha multiplication.
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`, `oklab(0.5 0.6 0.7)`);
 
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `oklab(0.36666664 0.46666664 0.56666664 / 0.6)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))`, `oklab(0.26 0.36 0.46 / 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)`, `oklab(0.26 0.36 0.46 / 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`); // Scale down > 100% sum.
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.35)`); // Scale up < 100% sum, causes alpha multiplication.
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))`, `oklab(0.5 0.6 0.7 / 0.8)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `oklab(0.36666664 0.46666664 0.56666664 / 0.6)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))`, `oklab(0.26 0.36 0.46 / 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)`, `oklab(0.26 0.36 0.46 / 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.7)`); // Scale down > 100% sum.
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)`, `oklab(0.44285713 0.54285717 0.6428571 / 0.35)`); // Scale up < 100% sum, causes alpha multiplication.
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))`, `oklab(0.5 0.6 0.7 / 0.8)`);
 
-    fuzzy_test_computed_color(`color-mix(in oklab, transparent, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.5)');
-    fuzzy_test_computed_color(`color-mix(in oklab, transparent 10%, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.9)');
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 0), oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.5)');
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 0) 10%, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.9)');
+        fuzzy_test_computed_color(`color-mix(${colorSpace}transparent, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.5)');
+        fuzzy_test_computed_color(`color-mix(${colorSpace}transparent 10%, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.9)');
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 0), oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.5)');
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 0) 10%, oklab(0.3 0.4 0.5))`, 'oklab(0.3 0.4 0.5 / 0.9)');
 
-    fuzzy_test_computed_color(`color-mix(in oklab, white, blue)`, `oklab(0.726 -0.016 -0.156)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, white 10%, blue)`, `oklab(0.507 -0.029 -0.28)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}white, blue)`, `oklab(0.726 -0.016 -0.156)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}white 10%, blue)`, `oklab(0.507 -0.029 -0.28)`);
 
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(none none none), oklab(none none none))`, `oklab(none none none)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(none none none), oklab(0.5 0.6 0.7))`, `oklab(0.5 0.6 0.7)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(none none none))`, `oklab(0.1 0.2 0.3)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.7)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`, `oklab(0.3 0.4 0.3)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(none 0.2 0.3), oklab(0.5 none 0.7))`, `oklab(0.5 0.2 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`, `oklab(0.3 0.4 0.5 / 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`, `oklab(0.3 0.4 0.5 / none)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(none none none), oklab(none none none))`, `oklab(none none none)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(none none none), oklab(0.5 0.6 0.7))`, `oklab(0.5 0.6 0.7)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3), oklab(none none none))`, `oklab(0.1 0.2 0.3)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.7)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`, `oklab(0.3 0.4 0.3)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(none 0.2 0.3), oklab(0.5 none 0.7))`, `oklab(0.5 0.2 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`, `oklab(0.3 0.4 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`, `oklab(0.3 0.4 0.5 / 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`, `oklab(0.3 0.4 0.5 / none)`);
 
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / none))`, `oklab(0.5 0.2 0.3 / 0.25)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none 0.5 none / none))`, `oklab(0.1 0.5 0.3 / 0.25)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none 0.5 / none))`, `oklab(0.1 0.2 0.5 / 0.25)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 0.5 none / none))`, `oklab(0.5 0.5 0.3 / 0.25)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none none / 0.5))`, `oklab(0.1 0.2 0.3 / 0.5)`);
-    fuzzy_test_computed_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / 0.5))`, `oklab(0.5 0.2 0.3 / 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / none))`, `oklab(0.5 0.2 0.3 / 0.25)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none 0.5 none / none))`, `oklab(0.1 0.5 0.3 / 0.25)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none 0.5 / none))`, `oklab(0.1 0.2 0.5 / 0.25)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 0.5 none / none))`, `oklab(0.5 0.5 0.3 / 0.25)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(none none none / 0.5))`, `oklab(0.1 0.2 0.3 / 0.5)`);
+        fuzzy_test_computed_color(`color-mix(${colorSpace}oklab(0.1 0.2 0.3 / 25%) 0%, oklab(0.5 none none / 0.5))`, `oklab(0.5 0.2 0.3 / 0.5)`);
+    }
 
     for (const colorSpace of [ "srgb", "srgb-linear", "display-p3", "display-p3-linear", "a98-rgb", "prophoto-rgb", "rec2020", "xyz", "xyz-d50", "xyz-d65" ]) {
         const resultColorSpace = colorSpace == "xyz" ? "xyz-d65" : colorSpace;
diff --git a/tests/wpt/tests/css/css-color/parsing/color-invalid-color-mix-function.html b/tests/wpt/tests/css/css-color/parsing/color-invalid-color-mix-function.html
index f73f2515d85..3d6fd06c92b 100644
--- a/tests/wpt/tests/css/css-color/parsing/color-invalid-color-mix-function.html
+++ b/tests/wpt/tests/css/css-color/parsing/color-invalid-color-mix-function.html
@@ -27,7 +27,6 @@
     test_invalid_value(`color`, `color-mix(in hsl hsl(120deg 10% 20%), hsl(30deg 30% 40%))`); // Missing comma after interpolation method.
     test_invalid_value(`color`, `color-mix(in hsl, hsl(120deg 10% 20%) hsl(30deg 30% 40%))`); // Missing comma between colors.
     test_invalid_value(`color`, `color-mix(hsl(120deg 10% 20%), hsl(30deg 30% 40%), in hsl)`); // Interpolation method not at the beginning.
-    test_invalid_value(`color`, `color-mix(hsl(120deg 10% 20%), hsl(30deg 30% 40%))`); // Missing interpolation method.
 
     test_invalid_value(`color`, `color-mix(in hwb, hwb(120deg 10% 20%) -10%, hwb(30deg 30% 40%))`); // Percentages less than 0 are not valid.
     test_invalid_value(`color`, `color-mix(in hwb, hwb(120deg 10% 20%) 150%, hwb(30deg 30% 40%))`); // Percentages greater than 100 are not valid.
@@ -41,7 +40,6 @@
     test_invalid_value(`color`, `color-mix(in hwb hwb(120deg 10% 20%), hwb(30deg 30% 40%))`); // Missing comma after interpolation method.
     test_invalid_value(`color`, `color-mix(in hwb, hwb(120deg 10% 20%) hwb(30deg 30% 40%))`); // Missing comma between colors.
     test_invalid_value(`color`, `color-mix(hwb(120deg 10% 20%), hwb(30deg 30% 40%), in hwb)`); // Interpolation method not at the beginning.
-    test_invalid_value(`color`, `color-mix(hwb(120deg 10% 20%), hwb(30deg 30% 40%))`); // Missing interpolation method.
     test_invalid_value(`color`, `color-mix(in srgb, red, blue blue)`); // Too many parameters.
 
     for (const colorSpace of [ "lch", "oklch" ]) {
@@ -57,7 +55,6 @@
         test_invalid_value(`color`, `color-mix(in ${colorSpace} ${colorSpace}(10% 20 30deg), ${colorSpace}(50% 60 70deg))`); // Missing comma after interpolation method.
         test_invalid_value(`color`, `color-mix(in ${colorSpace}, ${colorSpace}(10% 20 30deg) ${colorSpace}(50% 60 70deg))`); // Missing comma between colors.
         test_invalid_value(`color`, `color-mix(${colorSpace}(10% 20 30deg), ${colorSpace}(50% 60 70deg), in ${colorSpace})`); // Interpolation method not at the beginning.
-        test_invalid_value(`color`, `color-mix(${colorSpace}(10% 20 30deg), ${colorSpace}(50% 60 70deg))`); // Missing interpolation method.
     }
 
     for (const colorSpace of [ "lab", "oklab" ]) {
@@ -71,7 +68,6 @@
         test_invalid_value(`color`, `color-mix(in ${colorSpace} ${colorSpace}(10% 20 30), ${colorSpace}(50% 60 70))`); // Missing comma after interpolation method.
         test_invalid_value(`color`, `color-mix(in ${colorSpace}, ${colorSpace}(10% 20 30) ${colorSpace}(50% 60 70))`); // Missing comma between colors.
         test_invalid_value(`color`, `color-mix(${colorSpace}(10% 20 30), ${colorSpace}(50% 60 70), in ${colorSpace})`); // Interpolation method not at the beginning.
-        test_invalid_value(`color`, `color-mix(${colorSpace}(10% 20 30), ${colorSpace}(50% 60 70))`); // Missing interpolation method.
     }
 
     for (const colorSpace of [ "srgb", "srgb-linear", "display-p3", "display-p3-linear", "a98-rgb", "prophoto-rgb", "rec2020", "xyz", "xyz-d50", "xyz-d65" ]) {
@@ -85,7 +81,6 @@
         test_invalid_value(`color`, `color-mix(in ${colorSpace} color(${colorSpace} .1 .2 .3), color(${colorSpace} .5 .6 .7))`); // Missing comma after interpolation method.
         test_invalid_value(`color`, `color-mix(in ${colorSpace}, color(${colorSpace} .1 .2 .3) color(${colorSpace} .5 .6 .7))`); // Missing comma between colors.
         test_invalid_value(`color`, `color-mix(color(${colorSpace} .1 .2 .3), color(${colorSpace} .5 .6 .7), in ${colorSpace})`); // Interpolation method not at the beginning.
-        test_invalid_value(`color`, `color-mix(color(${colorSpace} .1 .2 .3), color(${colorSpace} .5 .6 .7))`); // Missing interpolation method.
     }
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-color/parsing/color-valid-color-mix-function.html b/tests/wpt/tests/css/css-color/parsing/color-valid-color-mix-function.html
index d9ae70afa28..17a6b0c5e7d 100644
--- a/tests/wpt/tests/css/css-color/parsing/color-valid-color-mix-function.html
+++ b/tests/wpt/tests/css/css-color/parsing/color-valid-color-mix-function.html
@@ -104,6 +104,8 @@
     fuzzy_test_valid_color(`color-mix(in hsl, hsl(120deg 40% 40% / none), hsl(0deg 40% 40% / 0.5))`, `color-mix(in hsl, rgba(61, 143, 61, 0), rgba(143, 61, 61, 0.5))`, 1);
     fuzzy_test_valid_color(`color-mix(in hsl, hsl(120deg 40% 40% / none), hsl(0deg 40% 40% / none))`, `color-mix(in hsl, rgba(61, 143, 61, 0), rgba(143, 61, 61, 0))`, 1);
 
+    fuzzy_test_valid_color(`color-mix(hsl(120deg 10% 20%), hsl(30deg 30% 40%))`, `color-mix(rgb(46, 56, 46), rgb(133, 102, 71))`); // Missing interpolation method.
+
     fuzzy_test_valid_color(`color-mix(in hsl, color(display-p3 0 1 0) 100%, rgb(0, 0, 0) 0%)`, `color-mix(in hsl, color(display-p3 0 1 0) 100%, rgb(0, 0, 0))`, 1);
     fuzzy_test_valid_color(`color-mix(in hsl, lab(100 104.3 -50.9) 100%, rgb(0, 0, 0) 0%)`, `color-mix(in hsl, lab(100 104.3 -50.9) 100%, rgb(0, 0, 0))`, 1);
     fuzzy_test_valid_color(`color-mix(in hsl, lab(0 104.3 -50.9) 100%, rgb(0, 0, 0) 0%)`, `color-mix(in hsl, lab(0 104.3 -50.9) 100%, rgb(0, 0, 0))`, 1);
@@ -195,6 +197,8 @@
     fuzzy_test_valid_color(`color-mix(in hwb, oklab(1 0.365 -0.16) 100%, rgb(0, 0, 0) 0%)`, `color-mix(in hwb, oklab(1 0.365 -0.16) 100%, rgb(0, 0, 0))`);
     fuzzy_test_valid_color(`color-mix(in hwb, oklch(1 0.399 336.3) 100%, rgb(0, 0, 0) 0%)`, `color-mix(in hwb, oklch(1 0.399 336.3) 100%, rgb(0, 0, 0))`);
 
+    fuzzy_test_valid_color(`color-mix(hwb(120deg 10% 20%), hwb(30deg 30% 40%))`, `color-mix(rgb(26, 204, 26), rgb(153, 115, 77))`); // Missing interpolation method.
+
     // lch()
     fuzzy_test_valid_color(`color-mix(in lch, lch(10 20 30deg), lch(50 60 70deg))`, `color-mix(in lch, lch(10 20 30), lch(50 60 70))`);
     fuzzy_test_valid_color(`color-mix(in lch, lch(10 20 30deg) 25%, lch(50 60 70deg))`, `color-mix(in lch, lch(10 20 30) 25%, lch(50 60 70))`);
@@ -260,6 +264,7 @@
     fuzzy_test_valid_color(`color-mix(in lch, lch(10 20 30deg / none), lch(50 60 70deg))`, `color-mix(in lch, lch(10 20 30 / none), lch(50 60 70))`);
     fuzzy_test_valid_color(`color-mix(in lch, lch(10 20 30deg / none), lch(50 60 70deg / 0.5))`, `color-mix(in lch, lch(10 20 30 / none), lch(50 60 70 / 0.5))`);
     fuzzy_test_valid_color(`color-mix(in lch, lch(10 20 30deg / none), lch(50 60 70deg / none))`, `color-mix(in lch, lch(10 20 30 / none), lch(50 60 70 / none))`);
+    fuzzy_test_valid_color(`color-mix(lch(10 20 30), lch(50 60 70))`); // Missing interpolation method.
 
     // oklch()
     fuzzy_test_valid_color(`color-mix(in oklch, oklch(0.1 0.2 30deg), oklch(0.5 0.6 70deg))`, `color-mix(in oklch, oklch(0.1 0.2 30), oklch(0.5 0.6 70))`);
@@ -327,6 +332,8 @@
     fuzzy_test_valid_color(`color-mix(in oklch, oklch(0.1 0.2 30deg / none), oklch(0.5 0.6 70deg / 0.5))`, `color-mix(in oklch, oklch(0.1 0.2 30 / none), oklch(0.5 0.6 70 / 0.5))`);
     fuzzy_test_valid_color(`color-mix(in oklch, oklch(0.1 0.2 30deg / none), oklch(0.5 0.6 70deg / none))`, `color-mix(in oklch, oklch(0.1 0.2 30 / none), oklch(0.5 0.6 70 / none))`);
 
+    fuzzy_test_valid_color(`color-mix(oklch(0.1 20 30), oklch(0.5 60 70))`); // Missing interpolation method.
+
     // lab()
     fuzzy_test_valid_color(`color-mix(in lab, lab(10 20 30), lab(50 60 70))`, `color-mix(in lab, lab(10 20 30), lab(50 60 70))`);
     fuzzy_test_valid_color(`color-mix(in lab, lab(10 20 30) 25%, lab(50 60 70))`, `color-mix(in lab, lab(10 20 30) 25%, lab(50 60 70))`);
@@ -358,36 +365,40 @@
     fuzzy_test_valid_color(`color-mix(in lab, lab(10 20 30 / none), lab(50 60 70 / 0.5))`, `color-mix(in lab, lab(10 20 30 / none), lab(50 60 70 / 0.5))`);
     fuzzy_test_valid_color(`color-mix(in lab, lab(10 20 30 / none), lab(50 60 70 / none))`, `color-mix(in lab, lab(10 20 30 / none), lab(50 60 70 / none))`);
 
+    fuzzy_test_valid_color(`color-mix(lab(10 20 30), lab(50 60 70))`); // Missing interpolation method.
+
     // oklab()
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 75%, oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 75%, oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), 25% oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3) 75%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7) 25%)`, `color-mix(oklab(0.1 0.2 0.3) 75%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7) 75%)`, `color-mix(oklab(0.1 0.2 0.3) 25%, oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`, `color-mix(oklab(0.1 0.2 0.3) 30%, oklab(0.5 0.6 0.7) 90%)`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`, `color-mix(oklab(0.1 0.2 0.3) 12.5%, oklab(0.5 0.6 0.7) 37.5%)`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3) 0%, oklab(0.5 0.6 0.7))`);
 
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4), oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 75%, oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 75%, oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 30%, oklab(0.5 0.6 0.7 / 0.8) 90%)`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 12.5%, oklab(0.5 0.6 0.7 / 0.8) 37.5%)`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / 0.4) 0%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `color-mix(oklab(0.1 0.2 0.3 / 0.4), oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8))`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, 25% oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8))`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), 25% oklab(0.5 0.6 0.7 / .8))`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 75%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4), oklab(0.5 0.6 0.7 / .8) 25%)`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 75%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 25%, oklab(0.5 0.6 0.7 / .8) 75%)`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 25%, oklab(0.5 0.6 0.7 / 0.8))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 30%, oklab(0.5 0.6 0.7 / .8) 90%)`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 30%, oklab(0.5 0.6 0.7 / 0.8) 90%)`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 12.5%, oklab(0.5 0.6 0.7 / .8) 37.5%)`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 12.5%, oklab(0.5 0.6 0.7 / 0.8) 37.5%)`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / .4) 0%, oklab(0.5 0.6 0.7 / .8))`, `color-mix(oklab(0.1 0.2 0.3 / 0.4) 0%, oklab(0.5 0.6 0.7 / 0.8))`);
 
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none none none), oklab(none none none))`, `color-mix(in oklab, oklab(none none none), oklab(none none none))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none none none), oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(none none none), oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(none none none))`, `color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(none none none))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`, `color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none 0.2 0.3), oklab(0.5 none 0.7))`, `color-mix(in oklab, oklab(none 0.2 0.3), oklab(0.5 none 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`);
-    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`, `color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none none none), oklab(none none none))`, `color-mix(oklab(none none none), oklab(none none none))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none none none), oklab(0.5 0.6 0.7))`, `color-mix(oklab(none none none), oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(none none none))`, `color-mix(oklab(0.1 0.2 0.3), oklab(none none none))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 none), oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`, `color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 none))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(none 0.2 0.3), oklab(0.5 none 0.7))`, `color-mix(oklab(none 0.2 0.3), oklab(0.5 none 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`, `color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`, `color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / 0.5))`);
+    fuzzy_test_valid_color(`color-mix(in oklab, oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`, `color-mix(oklab(0.1 0.2 0.3 / none), oklab(0.5 0.6 0.7 / none))`);
+
+    fuzzy_test_valid_color(`color-mix(oklab(0.1 0.2 0.3), oklab(0.5 0.6 0.7))`); // Missing interpolation method.
 
     for (const colorSpace of [ "srgb", "srgb-linear", "display-p3", "display-p3-linear", "a98-rgb", "prophoto-rgb", "rec2020", "xyz", "xyz-d50", "xyz-d65" ]) {
       const resultColorSpace = colorSpace == "xyz" ? "xyz-d65" : colorSpace;
@@ -423,6 +434,8 @@
       fuzzy_test_valid_color(`color-mix(in ${colorSpace}, color(${colorSpace} .1 .2 .3 / none), color(${colorSpace} .5 .6 .7))`, `color-mix(in ${resultColorSpace}, color(${resultColorSpace} 0.1 0.2 0.3 / none), color(${resultColorSpace} 0.5 0.6 0.7))`);
       fuzzy_test_valid_color(`color-mix(in ${colorSpace}, color(${colorSpace} .1 .2 .3 / none), color(${colorSpace} .5 .6 .7 / 0.5))`, `color-mix(in ${resultColorSpace}, color(${resultColorSpace} 0.1 0.2 0.3 / none), color(${resultColorSpace} 0.5 0.6 0.7 / 0.5))`);
       fuzzy_test_valid_color(`color-mix(in ${colorSpace}, color(${colorSpace} .1 .2 .3 / none), color(${colorSpace} .5 .6 .7 / none))`, `color-mix(in ${resultColorSpace}, color(${resultColorSpace} 0.1 0.2 0.3 / none), color(${resultColorSpace} 0.5 0.6 0.7 / none))`);
+
+      fuzzy_test_valid_color(`color-mix(color(${colorSpace} .1 .2 .3), color(${colorSpace} .5 .6 .7))`, `color-mix(color(${resultColorSpace} .1 .2 .3), color(${resultColorSpace} .5 .6 .7))`); // Missing interpolation method.
     }
 
     // Test percent normalization
diff --git a/tests/wpt/tests/css/css-color/parsing/color-valid-relative-color.html b/tests/wpt/tests/css/css-color/parsing/color-valid-relative-color.html
index 1290b7dc125..5f05a55eaaf 100644
--- a/tests/wpt/tests/css/css-color/parsing/color-valid-relative-color.html
+++ b/tests/wpt/tests/css/css-color/parsing/color-valid-relative-color.html
@@ -417,7 +417,7 @@
     fuzzy_test_valid_color(`oklab(from currentColor l a b)`, `oklab(from currentcolor l a b)`);
 
     // color-mix
-    fuzzy_test_valid_color(`oklab(from color-mix(in oklab, oklab(0.25 0.2 0.5), oklab(0.25 0.2 0.5)) l a b / alpha)`);
+    fuzzy_test_valid_color(`oklab(from color-mix(in oklab, oklab(0.25 0.2 0.5), oklab(0.25 0.2 0.5)) l a b / alpha)`, `oklab(from color-mix(oklab(0.25 0.2 0.5), oklab(0.25 0.2 0.5)) l a b / alpha)`);
 
     // lch()
 
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/container-for-shadow-dom.html b/tests/wpt/tests/css/css-conditional/container-queries/container-for-shadow-dom.html
index 13a2423a822..f49858ecd7d 100644
--- a/tests/wpt/tests/css/css-conditional/container-queries/container-for-shadow-dom.html
+++ b/tests/wpt/tests/css/css-conditional/container-queries/container-for-shadow-dom.html
@@ -228,7 +228,7 @@
   </template></div>
 </div>
 
-<div id="no-container-for-part">
+<div id="container-for-part">
   <div>
     <template shadowrootmode="open">
       <style>
@@ -244,7 +244,7 @@
     </template>
     <style>
       @container (width = 200px) {
-        #no-container-for-part > div::part(part) { color: green; }
+        #container-for-part > div::part(part) { color: green; }
       }
     </style>
   </div>
@@ -277,7 +277,7 @@
       }
       #named-part1 {
         container: --part1 / inline-size;
-        color: green;
+        color: red;
       }
     </style>
     <div id="named-part1" part="part1">
@@ -290,7 +290,7 @@
   <style>
     #named-part-host::part(part2) { container: --part2 / inline-size; }
     @container --part1 (width >= 0px) {
-      #named-part-host::part(part1-child) { background-color: red; }
+      #named-part-host::part(part1-child) { color: green; }
     }
   </style>
 </div>
@@ -313,7 +313,7 @@
   <div id="slotted2"></div>
   <style>
     @container --slot-container (width >= 0px) {
-      #slotted2 { color: red; }
+      #slotted2 { color: green; }
     }
   </style>
 </div>
@@ -336,7 +336,7 @@
   <div id="host-slotted2"></div>
   <style>
     @container --host-container (width >= 0px) {
-      #host-slotted2 { color: red; }
+      #host-slotted2 { color: green; }
     }
   </style>
 </div>
@@ -402,9 +402,9 @@
   }, "Match container for slot light tree child fallback");
 
   test(() => {
-    const t11 = document.querySelector("#no-container-for-part > div").shadowRoot.querySelector("#t11");
+    const t11 = document.querySelector("#container-for-part > div").shadowRoot.querySelector("#t11");
     assert_equals(getComputedStyle(t11).color, green);
-  }, "Should not match container inside shadow tree for ::part()");
+  }, "Should match container inside shadow tree for ::part()");
 
   test(() => {
     const t12 = document.querySelector("#inner-scope-host-part > div").shadowRoot.querySelector("#t12");
@@ -414,7 +414,7 @@
   test(() => {
     const target = document.querySelector("#named-part-host").shadowRoot.querySelector("#named-part1-child");
     assert_equals(getComputedStyle(target).color, green);
-  }, "Container name set inside a shadow tree should not match query using ::part on the outside");
+  }, "Container name set inside a shadow tree should match query using ::part on the outside");
 
   test(() => {
     const target = document.querySelector("#named-part-host").shadowRoot.querySelector("#named-part2-child");
@@ -428,8 +428,8 @@
 
   test(() => {
     const target = document.querySelector("#slotted2");
-    assert_not_equals(getComputedStyle(target).color, red);
-  }, "Container name set inside a shadow tree should not match query for host child on the outside");
+    assert_equals(getComputedStyle(target).color, green);
+  }, "Container name set inside a shadow tree should match query for host child on the outside");
 
   test(() => {
     const target = document.querySelector("#named-host").shadowRoot.querySelector("#host-descendant");
@@ -443,7 +443,7 @@
 
   test(() => {
     const target = document.querySelector("#host-slotted2");
-    assert_not_equals(getComputedStyle(target).color, red);
-  }, "Container name set on :host from inside a shadow tree not matching query for slotted from the outside of the shadow tree");
+    assert_equals(getComputedStyle(target).color, green);
+  }, "Container name set on :host from inside a shadow tree should match query for slotted from the outside of the shadow tree");
 
 </script>
diff --git a/tests/wpt/tests/css/css-fonts/font-size-adjust-009-ref.html b/tests/wpt/tests/css/css-fonts/font-size-adjust-009-ref.html
index 2ee9d0a0c8b..9796dda8cbc 100644
--- a/tests/wpt/tests/css/css-fonts/font-size-adjust-009-ref.html
+++ b/tests/wpt/tests/css/css-fonts/font-size-adjust-009-ref.html
@@ -11,7 +11,7 @@
   div {
     clear: left;
     float: left;
-    font: 60px/120px test;
+    font: 56px/112px test;
     color: orange;
     background: orange;
   }
@@ -22,12 +22,12 @@
   #test2 {
     color: blue;
     background: blue;
-    font-size: 90px;
+    font-size: 84px;
   }
   #test3 {
     color: magenta;
     background: magenta;
-    font-size: 45px;
+    font-size: 42px;
   }
 </style>
 <body>
diff --git a/tests/wpt/tests/css/css-fonts/font-size-adjust-009.html b/tests/wpt/tests/css/css-fonts/font-size-adjust-009.html
index 133f96f450c..8dcee7f53c8 100644
--- a/tests/wpt/tests/css/css-fonts/font-size-adjust-009.html
+++ b/tests/wpt/tests/css/css-fonts/font-size-adjust-009.html
@@ -17,7 +17,7 @@
   div {
     clear: left;
     float: left;
-    font: 60px/120px test;
+    font: 56px/112px test;
     color: orange;
     background: orange;
   }
diff --git a/tests/wpt/tests/css/css-fonts/font-size-adjust-010.html b/tests/wpt/tests/css/css-fonts/font-size-adjust-010.html
index 490c7711c9a..d70119a98e4 100644
--- a/tests/wpt/tests/css/css-fonts/font-size-adjust-010.html
+++ b/tests/wpt/tests/css/css-fonts/font-size-adjust-010.html
@@ -18,7 +18,7 @@
   div {
     clear: left;
     float: left;
-    font: 60px/120px test;
+    font: 56px/112px test;
     color: orange;
     background: orange;
   }
diff --git a/tests/wpt/tests/css/css-fonts/font-size-adjust-011.html b/tests/wpt/tests/css/css-fonts/font-size-adjust-011.html
index 3f6afd8a370..cf0d620da72 100644
--- a/tests/wpt/tests/css/css-fonts/font-size-adjust-011.html
+++ b/tests/wpt/tests/css/css-fonts/font-size-adjust-011.html
@@ -17,7 +17,7 @@
   div {
     clear: left;
     float: left;
-    font: 60px/120px test;
+    font: 56px/112px test;
     color: orange;
     background: orange;
   }
diff --git a/tests/wpt/tests/css/css-grid/grid-model/grid-support-display-001.html b/tests/wpt/tests/css/css-grid/grid-model/grid-support-display-001.html
index c69d0e31b04..03779f4afb1 100644
--- a/tests/wpt/tests/css/css-grid/grid-model/grid-support-display-001.html
+++ b/tests/wpt/tests/css/css-grid/grid-model/grid-support-display-001.html
@@ -5,7 +5,7 @@
 <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2014-11-18 -->
 <link rel="help" href="http://www.w3.org/TR/css-grid-1/#grid-containers" title="3.1 Establishing Grid Containers">
 <meta name="flags" content="dom">
-<meta name="assert" content="This test checks that 'grid' and 'inline-grid' values for 'display' property are supported so that DOM methods, specifically getComputedValue(), and its associated CSS2Properties interface, can fetch such 'display' values.">
+<meta name="assert" content="This test checks that 'grid' and 'inline-grid' values for 'display' property are supported so that DOM methods, specifically getComputedValue(), and its associated CSSStyleProperties interface, can fetch such 'display' values.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <style>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html b/tests/wpt/tests/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html
new file mode 100644
index 00000000000..e509295c433
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/abspos/row-masonry-positioned-item-dynamic-change.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>CSS Masonry Layout Test: Masonry positioned item dynamic change.</title>
+  <link rel="author" title="Yanling Wang" href="mailto:yanlingwang@microsoft.com">
+  <link rel="help" href="https://drafts.csswg.org/css-grid-3/#abspos">
+  <link rel="match" href="../../../../reference/ref-filled-green-100px-square-only.html">
+  <style>
+    .masonry {
+        display: masonry;
+        masonry-direction: row;
+        grid-template-rows: 75px 25px;
+        position: relative;
+        width: 100px;
+    }
+
+    .absolute {
+        background: green;
+        position: absolute;
+        grid-row: 1 / 2;
+        top: 0;
+        bottom: 0;
+        right: 0;
+        left: 0;
+    }
+  </style>
+<body>
+<p>Test passes if there is a filled green square.</p>
+<div class="masonry">
+  <div style="background: green; height: 100%; width: 100%"></div>
+  <div style="background: red; height: 100%; width: 100%"></div>
+  <div id="target" class="absolute"></div>
+</div>
+<script>
+  document.body.offsetLeft;
+  document.getElementById('target').style.gridRow = '2 / 3';
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html
new file mode 100644
index 00000000000..b111c4c44b5
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-implicit-track.tentative.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-columns on a masonry container with a leading implicit track.">
+<style>
+#target {
+  display: masonry;
+  width: 1px;
+  font-size: 1px;
+}
+#item {
+  grid-column: auto / 1;
+  width: 10px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="target">
+  <div id="item"></div>
+</div>
+<script>
+// Can't use the test_computed_value from computed-testcommon.js
+// because grid-template-columns doesn't round-trip in this test.
+function grid_template_columns(specified, computed) {
+  test(() => {
+    const target = document.getElementById('target');
+    target.style.gridTemplateColumns = '';
+    target.style.gridTemplateColumns = specified;
+    assert_equals(getComputedStyle(target).gridTemplateColumns, computed);
+  }, `Property grid-template-columns value '${specified}' computes to '${computed}'`);
+}
+
+grid_template_columns("1px repeat(auto-fill, auto) 3px", "10px 1px 0px 3px");
+grid_template_columns("1px repeat(auto-fit, auto) 3px", "10px 1px 0px 3px");
+grid_template_columns("1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "10px 1px [a] 0px 0px [b] 4px");
+grid_template_columns("1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "10px 1px [a] 0px 0px [b] 4px");
+grid_template_columns("1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "10px 1px [a b] 0px [c d] 3px");
+grid_template_columns("1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "10px 1px [a b] 0px [c d] 3px");
+grid_template_columns("[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "10px [a] 1px 0px [b] 0px 4px [d]");
+grid_template_columns("[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "10px [a] 1px 0px [b] 0px 4px [d]");
+grid_template_columns("100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "10px 1px [a b] 0px [c d] 3px");
+grid_template_columns("100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "10px 1px [a b] 0px [c d] 3px");
+grid_template_columns("[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "10px [a] 1px 0px [b] 0px 4px [d]");
+grid_template_columns("[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "10px [a] 1px 0px [b] 0px 4px [d]");
+</script>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html
new file mode 100644
index 00000000000..4408ce428c8
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-nogrid.tentative.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-columns on an element which is not a masonry container.">
+<style>
+#target {
+  display: block;
+  height: 1px;
+  font-size: 1px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<div id="target"></div>
+<script>
+test_computed_value("grid-template-columns", "1px repeat(auto-fill, auto) 3px", "none");
+test_computed_value("grid-template-columns", "1px repeat(auto-fit, auto) 3px", "none");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "none");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "none");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "none");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "none");
+test_computed_value("grid-template-columns", "[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "none");
+test_computed_value("grid-template-columns", "[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "none");
+test_computed_value("grid-template-columns", "100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "none");
+test_computed_value("grid-template-columns", "100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "none");
+test_computed_value("grid-template-columns", "[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "none");
+test_computed_value("grid-template-columns", "[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "none");
+</script>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html
new file mode 100644
index 00000000000..09030b6757e
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed-withcontent.tentative.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns with intrinsic auto repeats</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-columns">
+<meta name="assert" content="grid-template-columns computed value is the keyword none or a computed track list.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+  #target {
+    display: masonry;
+    font-size: 40px;
+    min-width: 200px;
+    width: 300px;
+    max-width: 400px;
+    min-height: 500px;
+    height: 600px;
+    max-height: 700px;
+  }
+  #child {
+    min-width: 20px;
+    width: 30px;
+    max-width: 40px;
+    min-height: 50px;
+    height: 60px;
+    max-height: 70px;
+  }
+</style>
+</head>
+<body>
+<div id="container">
+  <div id="target">
+    <div id="child"></div>
+  </div>
+</div>
+<script>
+
+// <auto-repeat> = repeat( [ auto-fill | auto-fit ] , [ <line-names>? <intrinsic-or-fixed-size> ]+ <line-names>? )
+test_computed_value("grid-template-columns", 'repeat(auto-fill, auto)', '30px 30px 30px 30px 30px 30px 30px 30px 30px 30px');
+test_computed_value("grid-template-columns", 'repeat(auto-fit, [one] auto)',
+                    '[one] 300px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px');
+test_computed_value("grid-template-columns", 'repeat(auto-fill, min-content [two])',
+                    '30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two]');
+test_computed_value("grid-template-columns", 'repeat(auto-fit, [three] max-content [four])',
+                    '[three] 30px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four]');
+test_computed_value('grid-template-columns', '[a] 21px [b] repeat(auto-fill, [c] 22px [d] auto [e]) [f] 24px [g]',
+                    '[a] 21px [b c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e f] 24px [g]');
+test_computed_value('grid-template-columns', '[a] 21px [b c] repeat(auto-fill, [d e] 22px [f g h] fit-content(200px) [i j k l]) [m n] 24px [o]',
+                    '[a] 21px [b c d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l m n] 24px [o]');
+test_computed_value('grid-template-columns', '[a] repeat(2, [b] 20px [c d] 21px [e f g]) [h i] repeat(auto-fit, [j] auto [k l m] min-content [n o p q]) [r s]',
+                    '[a b] 20px [c d] 21px [e f g b] 20px [c d] 21px [e f g h i j] 0px [k l m] 0px [n o p q j] 0px [k l m] 30px [n o p q j] 158px [k l m] 30px [n o p q r s]');
+
+// <auto-track-list> =
+// [ <line-names>? [ <fixed-size> | <fixed-repeat> ] ]* <line-names>?
+// <auto-repeat>
+// [ <line-names>? [ <intrinsic-or-fixed-size> | <fixed-repeat> ] ]* <line-names>?
+
+test_computed_value("grid-template-columns", '[one] repeat(2, minmax(50px, auto)) [two] 30px [three] repeat(auto-fill, auto) 40px [four five] repeat(2, minmax(200px, auto)) [six]',
+                    '[one] 50px 50px [two] 30px [three] 30px 40px [four five] 200px 200px [six]');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html
new file mode 100644
index 00000000000..2168855ae93
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-intrinsic-auto-repeat-computed.tentative.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-columns on a masonry container.">
+<style>
+#target {
+  display: masonry;
+  width: 1px;
+  font-size: 1px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<div id="target"></div>
+<script>
+test_computed_value("grid-template-columns", "1px repeat(auto-fill, auto) 3px", "1px 0px 3px");
+test_computed_value("grid-template-columns", "1px repeat(auto-fit, auto) 3px", "1px 0px 3px");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-columns", "1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-columns", "[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-columns", "[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-columns", "100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-columns", "100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-columns", "[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-columns", "[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+</script>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html
new file mode 100644
index 00000000000..cdda66d1af3
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-implicit-track.tentative.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-rows on a masonry container with a leading implicit track.">
+<style>
+#target {
+  display: masonry;
+  masonry-direction: row;
+  width: 1px;
+  font-size: 1px;
+}
+#item {
+  grid-column: auto / 1;
+  width: 10px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="target">
+  <div id="item"></div>
+</div>
+<script>
+// Can't use the test_computed_value from computed-testcommon.js
+// because grid-template-rows doesn't round-trip in this test.
+function grid_template_rows(specified, computed) {
+  test(() => {
+    const target = document.getElementById('target');
+    target.style.gridTemplateRows = '';
+    target.style.gridTemplateRows = specified;
+    assert_equals(getComputedStyle(target).gridTemplateRows, computed);
+  }, `Property grid-template-rows value '${specified}' computes to '${computed}'`);
+}
+
+grid_template_rows("1px repeat(auto-fill, auto) 3px", "1px 0px 3px");
+grid_template_rows("1px repeat(auto-fit, auto) 3px", "1px 0px 3px");
+grid_template_rows("1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+grid_template_rows("1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+grid_template_rows("1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+grid_template_rows("1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+grid_template_rows("[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+grid_template_rows("[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+grid_template_rows("100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+grid_template_rows("100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+grid_template_rows("[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+grid_template_rows("[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+</script>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html
new file mode 100644
index 00000000000..bfb88b7a9e4
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-nogrid.tentative.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-rows on an element which is not a masonry container.">
+<style>
+#target {
+  display: block;
+  width: 1px;
+  font-size: 1px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<div id="target"></div>
+<script>
+test_computed_value("grid-template-rows", "1px repeat(auto-fill, auto) 3px", "none");
+test_computed_value("grid-template-rows", "1px repeat(auto-fit, auto) 3px", "none");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "none");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "none");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "none");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "none");
+test_computed_value("grid-template-rows", "[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "none");
+test_computed_value("grid-template-rows", "[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "none");
+test_computed_value("grid-template-rows", "100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "none");
+test_computed_value("grid-template-rows", "100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "none");
+test_computed_value("grid-template-rows", "[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "none");
+test_computed_value("grid-template-rows", "[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "none");
+</script>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html
new file mode 100644
index 00000000000..53fc9e29ef7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed-withcontent.tentative.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns with intrinsic auto repeats</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-rows">
+<meta name="assert" content="grid-template-rows computed value is the keyword none or a computed track list.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+  #target {
+    display: masonry;
+    masonry-direction: row;
+    font-size: 40px;
+    min-height: 200px;
+    height: 300px;
+    max-height: 400px;
+    min-width: 500px;
+    width: 600px;
+    max-width: 700px;
+  }
+  #child {
+    min-height: 20px;
+    height: 30px;
+    max-height: 40px;
+    min-width: 50px;
+    width: 60px;
+    max-width: 70px;
+  }
+</style>
+</head>
+<body>
+<div id="container">
+  <div id="target">
+    <div id="child"></div>
+  </div>
+</div>
+<script>
+
+// <auto-repeat> = repeat( [ auto-fill | auto-fit ] , [ <line-names>? <intrinsic-or-fixed-size> ]+ <line-names>? )
+test_computed_value("grid-template-rows", 'repeat(auto-fill, auto)', '30px 30px 30px 30px 30px 30px 30px 30px 30px 30px');
+test_computed_value("grid-template-rows", 'repeat(auto-fit, [one] auto)',
+                    '[one] 300px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px [one] 0px');
+test_computed_value("grid-template-rows", 'repeat(auto-fill, min-content [two])',
+                    '30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two] 30px [two]');
+test_computed_value("grid-template-rows", 'repeat(auto-fit, [three] max-content [four])',
+                    '[three] 30px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four three] 0px [four]');
+test_computed_value('grid-template-rows', '[a] 21px [b] repeat(auto-fill, [c] 22px [d] auto [e]) [f] 24px [g]',
+                    '[a] 21px [b c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e c] 22px [d] 41.75px [e f] 24px [g]');
+test_computed_value('grid-template-rows', '[a] 21px [b c] repeat(auto-fill, [d e] 22px [f g h] fit-content(200px) [i j k l]) [m n] 24px [o]',
+                    '[a] 21px [b c d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l d e] 22px [f g h] 30px [i j k l m n] 24px [o]');
+test_computed_value('grid-template-rows', '[a] repeat(2, [b] 20px [c d] 21px [e f g]) [h i] repeat(auto-fit, [j] auto [k l m] min-content [n o p q]) [r s]',
+                    '[a b] 20px [c d] 21px [e f g b] 20px [c d] 21px [e f g h i j] 0px [k l m] 0px [n o p q j] 0px [k l m] 30px [n o p q j] 158px [k l m] 30px [n o p q r s]');
+
+// <auto-track-list> =
+// [ <line-names>? [ <fixed-size> | <fixed-repeat> ] ]* <line-names>?
+// <auto-repeat>
+// [ <line-names>? [ <intrinsic-or-fixed-size> | <fixed-repeat> ] ]* <line-names>?
+
+test_computed_value("grid-template-rows", '[one] repeat(2, minmax(50px, auto)) [two] 30px [three] repeat(auto-fill, auto) 40px [four five] repeat(2, minmax(200px, auto)) [six]',
+                    '[one] 50px 50px [two] 30px [three] 30px 40px [four five] 200px 200px [six]');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html
new file mode 100644
index 00000000000..b70800cb730
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-intrinsic-auto-repeat-computed.tentative.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Masonry Layout Test: getComputedStyle().gridTemplateColumns</title>
+<link rel="author" title="Alison Maher" href="mailto:almaher@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#resolved-track-list" title="7.2.6. Resolved Value of a Track Listing">
+<meta name="assert" content="Checks the resolved value of grid-template-rows on a masonry container.">
+<style>
+#target {
+  display: masonry;
+  masonry-direction: row;
+  height: 1px;
+  font-size: 1px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<div id="target"></div>
+<script>
+test_computed_value("grid-template-rows", "1px repeat(auto-fill, auto) 3px", "1px 0px 3px");
+test_computed_value("grid-template-rows", "1px repeat(auto-fit, auto) 3px", "1px 0px 3px");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fill, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fit, min-content max-content) [b] 4px", "1px [a] 0px 0px [b] 4px");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fill, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-rows", "1px [a] repeat(auto-fit, [b] fit-content(200px) [c]) [d] 3px", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-rows", "[a] 1px repeat(auto-fill, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-rows", "[a] 1px repeat(auto-fit, auto [b] auto) 4px [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-rows", "100% [a] repeat(auto-fill, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-rows", "100% [a] repeat(auto-fit, [b] min-content [c]) [d] 300%", "1px [a b] 0px [c d] 3px");
+test_computed_value("grid-template-rows", "[a] 1em repeat(auto-fill, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+test_computed_value("grid-template-rows", "[a] 1em repeat(auto-fit, max-content [b] auto) 4em [d]", "[a] 1px 0px [b] 0px 4px [d]");
+</script>
diff --git a/tests/wpt/tests/css/css-mixins/contents-rule.html b/tests/wpt/tests/css/css-mixins/contents-rule.html
index 9d63cd56118..8dd62fba137 100644
--- a/tests/wpt/tests/css/css-mixins/contents-rule.html
+++ b/tests/wpt/tests/css/css-mixins/contents-rule.html
@@ -42,7 +42,7 @@
         @apply --m4;
       }
 
-      @mixin --m5 {
+      @mixin --m5() {
         @contents { color: red !important; }
         color: green;
       }
diff --git a/tests/wpt/tests/css/css-mixins/parameters.html b/tests/wpt/tests/css/css-mixins/parameters.html
new file mode 100644
index 00000000000..8f116c9c742
--- /dev/null
+++ b/tests/wpt/tests/css/css-mixins/parameters.html
@@ -0,0 +1,91 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Mixins: Parameters</title>
+    <link rel="help" href="https://drafts.csswg.org/css-mixins/#mixin-args">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+      @mixin --m1() {
+        color: green;
+      }
+      @mixin --m1(junk-in-parameter-list) {  /* Will be ignored. */
+        color: red;
+      }
+      #e1 {
+        @apply --m1;
+      }
+
+      @mixin --m2(--my-color) {
+        color: env(--my-color);
+      }
+      #e2 {
+        @apply --m2(green);
+      }
+      #e2b {
+        @apply --m2(navy);
+      }
+
+      @mixin --m3(--my-color) {
+        color: env(--my-color);
+      }
+      #e3 {
+        @apply --m3({green});
+      }
+
+      @mixin --m4(--my-color: green) {
+        color: env(--my-color);
+      }
+      #e4 {
+        @apply --m4;
+      }
+
+      @mixin --m5() {
+        color: red;
+      }
+      #e5 {
+        color: green;
+        @apply --m5(too-many-parameters);
+      }
+    </style>
+  </head>
+  <body>
+    <div><div id="e1">This text should be green.</div></div>
+    <div><div id="e2">This text should be green.</div></div>
+    <div><div id="e2b">This text should be navy.</div></div>
+    <div><div id="e3">This text should be green.</div></div>
+    <div><div id="e4">This text should be green.</div></div>
+    <div><div id="e5">This text should be green.</div></div>
+  <script>
+    test(() => {
+      let target = document.getElementById('e1');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+    }, 'Mixins with invalid parameter lists are ignored');
+
+    test(() => {
+      let target = document.getElementById('e2');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+    }, 'Basic mixin parameter passing');
+
+    test(() => {
+      let target = document.getElementById('e2b');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 128)');
+    }, 'Mixins can be called multiple times with different parameters');
+
+    test(() => {
+      let target = document.getElementById('e3');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+    }, 'Mixin argument parsing with arguments wrapped in {}');
+
+    test(() => {
+      let target = document.getElementById('e4');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+    }, 'Defaults in mixin parameters');
+
+    test(() => {
+      let target = document.getElementById('e5');
+      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+    }, '@apply with too many parameters is ignored');
+  </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-overflow/hit-test-stacking-context-parent-border-radius.html b/tests/wpt/tests/css/css-overflow/hit-test-stacking-context-parent-border-radius.html
new file mode 100644
index 00000000000..7e0820f0b57
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/hit-test-stacking-context-parent-border-radius.html
@@ -0,0 +1,93 @@
+<!DOCTYPE html>
+<title>Hit Test with Stacking Context</title>
+<link rel="author" title="Peng Zhou" href="mailto:zhoupeng.1996@bytedance.com">
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#border-radius">
+<link rel="help" href="https://issues.chromium.org/issues/40811639">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+#parent {
+  width: 100px;
+  height: 100px;
+  overflow: hidden;
+  border-radius: 50%;
+}
+#child {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+
+<div id="parent">
+  <div id="child"></div>
+</div>
+
+<script>
+function elementFromPointOutsideParentBorderRadius() {
+  const rect = document.getElementById('parent').getBoundingClientRect();
+  return document.elementFromPoint(rect.left + 27, rect.bottom - 5);
+}
+function elementFromPointInsideParentBorderRadius() {
+  const rect = document.getElementById('parent').getBoundingClientRect();
+  return document.elementFromPoint(rect.left + 32, rect.bottom - 10);
+}
+
+test(() => {
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+}, 'Hit testing respects border-radius clipping on elements without creating stacking contexts');
+
+test(() => {
+  child.style = 'will-change: transform';
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with will-change transform');
+
+test(() => {
+  child.style = 'opacity: 0.2';
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with opacity < 1');
+
+test(() => {
+  child.style = 'height: 1000px; transform: translate(0, -500px);';
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with a transform property');
+
+test(() => {
+  child.style = 'position: relative; top: 30px;';
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with a PaintOffset from the container');
+
+test(() => {
+  child.style = 'position: relative; top: 30px; overflow: scroll;';
+  assert_equals(elementFromPointOutsideParentBorderRadius(), document.body);
+  assert_equals(elementFromPointInsideParentBorderRadius(), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with a PaintOffsetTranslation from the container');
+
+test(() => {
+  child.style = 'position: relative; top: 30px; overflow: scroll;';
+  document.body.style.margin = '50px';
+  const container = document.createElement('div');
+  container.style.width = '50px';
+  container.style.height = '50px';
+  container.style.overflow = 'scroll';
+  container.appendChild(document.getElementById('parent'));
+  document.body.appendChild(container);
+  container.scrollTop = container.scrollHeight;
+  container.scrollLeft = 0;
+  const offset = container.getBoundingClientRect().left;
+  const curY = offset + 10;
+  assert_equals(document.elementFromPoint(offset, curY), container);
+  assert_equals(document.elementFromPoint(offset + 10, curY), child);
+  child.style = '';
+}, 'Hit testing respects border-radius clipping on elements with a different coordinate space');
+</script>
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-035.tentative.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-035.html
similarity index 100%
rename from tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-035.tentative.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-035.html
diff --git a/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-025.tentative.html b/tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-025.html
similarity index 100%
rename from tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-025.tentative.html
rename to tests/wpt/tests/css/css-overflow/line-clamp/line-clamp-auto-025.html
diff --git a/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets-ref.html b/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets-ref.html
new file mode 100644
index 00000000000..7f3005a01ac
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>CSS Overflow Reference: dynamic setting of scroll-target-group with inline scroll targets</title>
+<style>
+  .stg {
+    scroll-target-group: auto;
+
+    .target-current {
+      color: green;
+    }
+  }
+
+  #scroller {
+    height: 100px;
+    overflow: auto;
+  }
+</style>
+<div id="group" class="stg">
+  <a href="#a">a</a>
+  <a href="#b" class="target-current">b</a>
+</div>
+<div id="scroller">
+  <a id="a">aa</a>
+  <div style="height: 200px;"></div>
+  <a id="b">bb</a>
+  <div style="height: 200px;"></div>
+</div>
+<script>
+  scroller.scrollTop = 200;
+</script>
diff --git a/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets.html b/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets.html
new file mode 100644
index 00000000000..6a4cf05edc9
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scroll-target-group-inline-targets.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>CSS Overflow Test: dynamic setting of scroll-target-group with inline scroll targets</title>
+<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-target-group">
+<link rel="match" href="scroll-target-group-inline-targets-ref.html">
+<style>
+  .stg {
+    scroll-target-group: auto;
+
+    a:target-current {
+      color: green;
+    }
+  }
+
+  #scroller {
+    height: 100px;
+    overflow: auto;
+  }
+</style>
+<div id="group">
+  <a href="#a">a</a>
+  <a href="#b">b</a>
+</div>
+<div id="scroller">
+  <a id="a">aa</a>
+  <div style="height: 200px;"></div>
+  <a id="b">bb</a>
+  <div style="height: 200px;"></div>
+</div>
+<script>
+  scroller.scrollTop = 200;
+  document.documentElement.offsetTop;
+  group.classList.add("stg");
+</script>
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-008.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-008.html
index 11ae7faa36e..7b6e86473be 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-008.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-008.html
@@ -7,6 +7,7 @@
     <link rel="help" href="http://www.w3.org/TR/css-shapes-1/#shapes-from-image"/>
     <link rel="help" href="http://www.w3.org/TR/css-shapes-1/#shape-outside-property"/>
     <link rel="match" href="reference/shape-outside-linear-gradient-001-ref.html"/>
+    <meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under sideways-lr."/>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-014.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-014.html
index 624884e3903..1d1d7aacf00 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-014.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-014.html
@@ -8,6 +8,7 @@
     <link rel="help" href="http://www.w3.org/TR/css-shapes-1/#shape-outside-property"/>
     <link rel="help" href="http://www.w3.org/TR/css-shapes-1/#shape-margin-property"/>
     <link rel="match" href="reference/shape-outside-linear-gradient-001-ref.html"/>
+    <meta name="fuzzy" content="maxDifference=0-1; totalPixels=0-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient with shape-margin under sideways-lr."/>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
diff --git a/tests/wpt/tests/css/css-sizing/aspect-ratio/inheritance.html b/tests/wpt/tests/css/css-sizing/aspect-ratio/inheritance.html
new file mode 100644
index 00000000000..37301d8f622
--- /dev/null
+++ b/tests/wpt/tests/css/css-sizing/aspect-ratio/inheritance.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Inheritance of CSS aspect-ratio property</title>
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="author" title="Sam Weinig" href="mailto:sam@webkit.org">
+<meta name="assert" content="Property does not inherit.">
+<meta name="assert" content="Property has initial value according to the spec.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/inheritance-testcommon.js"></script>
+</head>
+<body>
+<div id="container">
+<div id="target"></div>
+</div>
+<script>
+assert_not_inherited('aspect-ratio', 'auto', '2 / 1');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002-ref.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002-ref.html
new file mode 100644
index 00000000000..ba306130cc2
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.no-autospace {
+  text-autospace: no-autospace;
+}
+.normal {
+  text-autospace: normal;
+}
+.spacing {
+  margin: 5px;
+}
+.spacing-left {
+  margin-left: 5px;
+}
+</style>
+<div id="container">
+  <div class="test no-autospace">&#x20000;&#x20000;<span class="spacing">XX</span>&#x20000;</div>
+  <div class="test no-autospace">&#x20000;。XX<span class="spacing-left">&#x20000;</span></div>
+  <div dir="rtl" class="test no-autospace">&#x20000;&#x20000;<span class="spacing">XX</span>&#x20000;</div>
+  <div dir="rtl" class="test no-autospace">&#x20000;。XX<span class="spacing-left">&#x20000;</span></div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002.html
new file mode 100644
index 00000000000..27b42dcb7a7
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-002.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: text-autospace:normal with ideographs that is outside of Basic Multilingual Plane.</title>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="match" href="text-autospace-002-ref.html">
+<style>
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.normal {
+  text-autospace: normal;
+}
+</style>
+<div id="container">
+  <div class="test normal">&#x20000;&#x20000;XX&#x20000;</div>
+  <div class="test normal">&#x20000;。XX&#x20000;</div>
+  <div dir="rtl" class="test normal">&#x20000;&#x20000;XX&#x20000;</div>
+  <div dir="rtl" class="test normal">&#x20000;。XX&#x20000;</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-003.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-003.html
new file mode 100644
index 00000000000..aa3af3227ba
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-003.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="text-autospace-001-ref.html">
+<style>
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.normal {
+  text-autospace: normal;
+  /* These properties have no effect on horizontal text,
+     so should not disable the auto-space insertion: */
+  text-orientation: upright;
+  text-combine-upright: all;
+}
+</style>
+<div id="container">
+  <div class="test normal">国国XX国</div>
+  <div class="test normal">国。XX国</div>
+  <div dir="rtl" class="test normal">国国XX国</div>
+  <div dir="rtl" class="test normal">国。XX国</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004-ref.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004-ref.html
new file mode 100644
index 00000000000..f63e1593598
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#container {
+  writing-mode: sideways-lr;
+}
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.no-autospace {
+  text-autospace: no-autospace;
+}
+.spacing {
+  margin: 5px;
+}
+.spacing-bottom {
+  margin-bottom: 5px;
+}
+</style>
+<div id="container">
+  <div class="test no-autospace">国国<span class="spacing">XX</span>国</div>
+  <div class="test no-autospace">国。XX<span class="spacing-bottom">国</span></div>
+  <div dir="rtl" class="test no-autospace">国国<span class="spacing">XX</span>国</div>
+  <div dir="rtl" class="test no-autospace">国。XX<span class="spacing-bottom">国</span></div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004.html
new file mode 100644
index 00000000000..3838a6bd5cf
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-004.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="match" href="text-autospace-004-ref.html">
+<style>
+#container {
+  writing-mode: sideways-lr;
+}
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.normal {
+  text-autospace: normal;
+  /* These properties have no effect in sideways-* writing modes,
+     so should not disable the auto-space insertion: */
+  text-orientation: upright;
+  text-combine-upright: all;
+}
+</style>
+<div id="container">
+  <div class="test normal">国国XX国</div>
+  <div class="test normal">国。XX国</div>
+  <div dir="rtl" class="test normal">国国XX国</div>
+  <div dir="rtl" class="test normal">国。XX国</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002-ref.html b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002-ref.html
new file mode 100644
index 00000000000..5d7be6d6b46
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>CSS Text Reference: Word Spacing</title>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<meta name="flags" content="ahem">
+<style>
+/* We use Ahem to avoid very minor differences between the test and the
+   reference that occur with certain font+platform combinations. */
+div     { font-family: Ahem, monospace; font-size: 20px; white-space: pre; }
+div .ws { margin: -1ch; }
+</style>
+<body>
+  <p>Test passes if the space between the words starts at zero and increases by
+  an even amount on each subsequent line.</p>
+  <div class="ws0">A&nbsp;<span class="ws">Bc</span> Def <span class="ws">Ghij</span></div>
+  <div class="ws1">A&nbsp;Bc Def Ghij</div>
+  <div class="ws2">A&nbsp; Bc  Def  Ghij</div>
+  <div class="ws3">A&nbsp;  Bc   Def   Ghij</div>
+  <div class="ws4">A&nbsp;   Bc    Def    Ghij</div>
+</body>
diff --git a/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002.html b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002.html
index 0def7e01790..817aa12d9f7 100644
--- a/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002.html
+++ b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-002.html
@@ -4,14 +4,10 @@
 <link rel="author" title="Elika Etemad" href="http://fantasai.inkedblade.net/contact">
 <link rel="help" href="http://www.w3.org/TR/css-text-3/#word-spacing">
 <link rel="stylesheet" href="/fonts/ahem.css">
-<link rel="match" href="word-spacing-001-ref.html">
+<link rel="match" href="word-spacing-002-ref.html">
 <meta name="flags" content="ahem">
 <meta name="assert" content="Test checks various length values of word-spacing, including calc().">
 <style>
-@font-face {
-  font-family: Ahem;
-  src: url(/fonts/Ahem.ttf);
-}
 /* We use Ahem to avoid very minor differences between the test and the
    reference that occur with certain font+platform combinations. */
 div        { font-family: Ahem, monospace; font-size: 20px; }
diff --git a/tests/wpt/tests/css/css-transforms/transform-scroll-child-tweak-crash.html b/tests/wpt/tests/css/css-transforms/transform-scroll-child-tweak-crash.html
new file mode 100644
index 00000000000..4c46b6dab4f
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/transform-scroll-child-tweak-crash.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html class="test-wait">
+<style>
+* {
+	pointer-events: none;
+}
+.transformed {
+	width: 200px;
+	height: 200px;
+	transform: translate(10px, 10px);
+}
+.scrollcontainer {
+	width: 150px;
+	height: 150px;
+	overflow: auto;
+	scrollbar-width: none;
+}
+#container {
+	width: 10px;
+	height: 200px;
+}
+#thediv1 {
+	width: 2px; height: 2px;
+	background: green;
+}
+
+</style>
+<div class="transformed">
+	<div class="scrollcontainer" id="scrollcontainer">
+		<div id="container">
+			<div id="thediv1"></div>
+		</div>
+	</div>
+</div>
+
+<script>
+function promiseFrame() {
+	return new Promise(resolve => window.requestAnimationFrame(resolve));
+}
+function finish() {
+	document.documentElement.className = "";
+}
+
+function tweak2() {
+	document.getElementById("container").style.height = "100px";
+	document.getElementById("scrollcontainer").style.overflow = "visible";
+	requestAnimationFrame(finish);
+}
+
+function tweak() {
+	document.getElementById("thediv1").style.background = "red";
+	requestAnimationFrame(tweak2);
+}
+
+async function start() {
+	await promiseFrame();
+	await promiseFrame();
+	tweak();
+	await promiseFrame();
+	await promiseFrame();
+	tweak2();
+	await promiseFrame();
+	await promiseFrame();
+	finish();
+}
+
+window.onload = () => {
+	requestAnimationFrame(start);
+};
+
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-values/chrome-typed-arithmetic-crash.html b/tests/wpt/tests/css/css-values/chrome-typed-arithmetic-crash.html
new file mode 100644
index 00000000000..9aa01db31fa
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/chrome-typed-arithmetic-crash.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>Typed arithmetic crash in Chrome</title>
+<link rel="help" href="https://crbug.com/443107131">
+<style>
+div {
+  height: calc(clamp(40px, 1px * 1px / 1px, 50px) + 60px);
+  width: calc(clamp(40px, 1px * 1rem / 1px, 50px) + 60px);
+  margin-left: calc(1% + 1% * (1vw - 1px) / 1px);
+}
+</style>
+<div></div>
diff --git a/tests/wpt/tests/css/css-view-transitions/get-computed-style-crash.html b/tests/wpt/tests/css/css-view-transitions/get-computed-style-crash.html
index 38cd5af7f83..7ea18483fd4 100644
--- a/tests/wpt/tests/css/css-view-transitions/get-computed-style-crash.html
+++ b/tests/wpt/tests/css/css-view-transitions/get-computed-style-crash.html
@@ -10,7 +10,7 @@ async function start() {
  var el = document.createElement(undefined);
  document.body.appendChild(el);
 
- var style = self.getComputedStyle(el, ':view-transition');
+ var style = self.getComputedStyle(el, '::view-transition');
  style.getPropertyValue("--child");
 }
 </script>
diff --git a/tests/wpt/tests/css/css-view-transitions/parsing/view-transition-name-valid.html b/tests/wpt/tests/css/css-view-transitions/parsing/view-transition-name-valid.html
index b3da54a5e06..ea73b6b5589 100644
--- a/tests/wpt/tests/css/css-view-transitions/parsing/view-transition-name-valid.html
+++ b/tests/wpt/tests/css/css-view-transitions/parsing/view-transition-name-valid.html
@@ -13,7 +13,9 @@
 <body>
 <script>
 test_valid_value("view-transition-name", "none");
-test_valid_value("view-transition-name", "auto");
+// See https://github.com/web-platform-tests/interop/issues/954 and
+// https://github.com/w3c/csswg-drafts/issues/12091
+// test_valid_value("view-transition-name", "auto");
 test_valid_value("view-transition-name", "match-element");
 test_valid_value("view-transition-name", "foo");
 test_valid_value("view-transition-name", "bar");
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/active-pseudo.html b/tests/wpt/tests/css/css-view-transitions/scoped/active-pseudo.html
new file mode 100644
index 00000000000..47eefb10f0b
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/active-pseudo.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<head>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
+<link rel="match" href="content-ref.html">
+<script src="/common/reftest-wait.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<style>
+
+body { margin: 20px }
+#scope {
+  position: relative; z-index: 0; background: pink;
+  border: 5px dashed purple; padding: 5px;
+  width: 180px; height: 120px; view-transition-name: none;
+}
+#part {
+  position: relative; z-index: 0; background: lightgrey;
+  border: 5px solid blue; padding: 5px;
+  width: 120px; height: 60px;
+  left: 20px; top: 20px;
+}
+
+body:has(> #scope:active-view-transition-type(baz)) #part {
+  view-transition-name: foo;
+}
+#scope:active-view-transition::view-transition { background: yellow; }
+#scope:active-view-transition-type(notme)::view-transition { background: red; }
+
+#scope::view-transition-group(foo) { animation-play-state: paused; }
+#scope::view-transition-new(foo) { animation: unset; opacity: 0; }
+#scope::view-transition-old(foo) { animation: unset; opacity: 1; }
+
+</style>
+</head>
+<body>
+<div id=scope>
+  <div id=part>
+    PARTICIPANT
+  </div>
+</div>
+<script>
+
+const scope = document.querySelector("#scope");
+failIfNot(scope.startViewTransition, "Missing element.startViewTransition");
+
+async function runTest() {
+  await waitForCompositorReady();
+  scope.startViewTransition({
+    update: () => requestAnimationFrame(takeScreenshot),
+    types: ["baz"]
+  });
+}
+onload = () => runTest();
+
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/auto-name-on-descendant.html b/tests/wpt/tests/css/css-view-transitions/scoped/auto-name-on-descendant.html
index 01d570e8bfc..0f4dc6f2e10 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/auto-name-on-descendant.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/auto-name-on-descendant.html
@@ -18,6 +18,7 @@
        animation-name.
     */
     will-change: opacity;
+    view-transition-name: none;
   }
 
   .item {
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/crashtests/container-query.html b/tests/wpt/tests/css/css-view-transitions/scoped/crashtests/container-query.html
new file mode 100644
index 00000000000..63132582beb
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/crashtests/container-query.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="test-wait">
+<style>
+  #container {
+    width: 100px;
+    container-type: inline-size;
+  }
+  @container (width > 200px) {
+    #target { background-color: green }
+  }
+</style>
+<div id="container">
+  <div id="target">
+    <div id="scope">Scope</div>
+  </div>
+</div>
+<script>
+  onload = async () => {
+    await scope.startViewTransition(() => {
+      container.style.width = "300px";
+    }).ready;
+    document.documentElement.classList.remove("test-wait");
+  };
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/display-change.html b/tests/wpt/tests/css/css-view-transitions/scoped/display-change.html
index 74428fafc7a..7583ac2d928 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/display-change.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/display-change.html
@@ -11,7 +11,7 @@ body { margin: 20px }
 #scope {
   position: relative; z-index: 0; background: pink;
   border: 5px dashed purple; padding: 5px;
-  width: 180px; height: 120px;
+  width: 180px; height: 120px; view-transition-name: none;
 }
 #part {
   position: relative; z-index: 0; background: lightgrey;
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/missing-view-transition-name.html b/tests/wpt/tests/css/css-view-transitions/scoped/missing-view-transition-name.html
index 74c35501d03..af1e4ae26f3 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/missing-view-transition-name.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/missing-view-transition-name.html
@@ -26,19 +26,23 @@
     const vt1 = document.startViewTransition(() => {
       target.style.opacity = 0.5;
     });
+    await vt1.ready;
 
     const vt2 = target.startViewTransition(() => {
       target.style.backgroundColor = 'green';
     });
-
-    await Promise.all([vt1.ready, vt2.ready]);
+    await vt2.ready;
 
     const expected_root_pseudos = [
       '::view-transition-group(root)',
       '::view-transition-new(root)',
       '::view-transition-old(root)'
     ];
-    const expected_target_pseudos = [];
+    const expected_target_pseudos = [
+      '::view-transition-group(root)',
+      '::view-transition-new(root)',
+      '::view-transition-old(root)'
+    ];
 
     assert_animation_pseudos(
         document.documentElement, expected_root_pseudos,
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/nested-scope.html b/tests/wpt/tests/css/css-view-transitions/scoped/nested-scope.html
index b9cc25c3338..93091bc2bbe 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/nested-scope.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/nested-scope.html
@@ -8,11 +8,11 @@
 <style>
 
 .box { position: relative; contain: strict; }
-#scopeA { background: #ddd;
+#scopeA { background: #ddd; view-transition-name: none;
           left: 0; top: 0; width: 300px; height: 300px; }
 #partA { background: #4af;
          left: 30px; top: 30px; width: 240px; height: 240px; }
-#scopeB { background: #eee;
+#scopeB { background: #eee; contain: view-transition;
           left: 30px; top: 30px; width: 180px; height: 180px; }
 #partB { background: cyan;
          left: 30px; top: 30px; width: 120px; height: 120px; }
@@ -43,12 +43,6 @@ failIfNot(scopeA.startViewTransition, "Missing element.startViewTransition");
 async function runTest() {
   await waitForCompositorReady();
   await scopeB.startViewTransition().ready;
-
-  // Untag partB to avoid a collision when the outer transition looks for its
-  // participants. (We can stop doing this once we have contain: view-transition
-  // or similar.)
-  partB.classList.remove("tr");
-
   await scopeA.startViewTransition(() => {
     scopeA.style.background = "#ccc";
   }).ready;
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/new-content.html b/tests/wpt/tests/css/css-view-transitions/scoped/new-content.html
index 7302f7c4f8e..699cede9a46 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/new-content.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/new-content.html
@@ -11,7 +11,7 @@ body { margin: 20px }
 #scope {
   position: relative; z-index: 0; background: pink;
   border: 5px dashed purple; padding: 5px;
-  width: 180px; height: 120px;
+  width: 180px; height: 120px; view-transition-name: none;
 }
 #part {
   position: relative; z-index: 0; background: lightgrey;
@@ -21,9 +21,6 @@ body { margin: 20px }
   view-transition-name: foo;
 }
 
-/* TODO(crbug.com/405117185): This shouldn't be necessary. */
-:root { view-transition-name: none; }
-
 #scope::view-transition { background: yellow; }
 #scope::view-transition-group(foo) { animation-play-state: paused; }
 #scope::view-transition-new(foo) { animation: unset; opacity: 1; }
diff --git a/tests/wpt/tests/css/css-view-transitions/scoped/old-content.html b/tests/wpt/tests/css/css-view-transitions/scoped/old-content.html
index 82b45eb75f4..202e9698d26 100644
--- a/tests/wpt/tests/css/css-view-transitions/scoped/old-content.html
+++ b/tests/wpt/tests/css/css-view-transitions/scoped/old-content.html
@@ -11,7 +11,7 @@ body { margin: 20px }
 #scope {
   position: relative; z-index: 0; background: pink;
   border: 5px dashed purple; padding: 5px;
-  width: 180px; height: 120px;
+  width: 180px; height: 120px; view-transition-name: none;
 }
 #part {
   position: relative; z-index: 0; background: lightgrey;
@@ -21,9 +21,6 @@ body { margin: 20px }
   view-transition-name: foo;
 }
 
-/* TODO(crbug.com/405117185): This shouldn't be necessary. */
-:root { view-transition-name: none; }
-
 #scope::view-transition { background: yellow; }
 #scope::view-transition-group(foo) { animation-play-state: paused; }
 #scope::view-transition-new(foo) { animation: unset; opacity: 0; }
diff --git a/tests/wpt/tests/css/cssom/historical.html b/tests/wpt/tests/css/cssom/historical.html
index 44f3f6c8f15..a47495de4cb 100644
--- a/tests/wpt/tests/css/cssom/historical.html
+++ b/tests/wpt/tests/css/cssom/historical.html
@@ -28,6 +28,7 @@
   "CSSValue",
   "CSSPrimitiveValue",
   "CSSValueList",
+  "CSS2Properties",
 ].forEach(function(name) {
   test(function() {
     assert_false(name in window);
diff --git a/tests/wpt/tests/css/filter-effects/backdrop-filter-basic-opacity-2.html b/tests/wpt/tests/css/filter-effects/backdrop-filter-basic-opacity-2.html
index c40e8bc0983..aad7badf185 100644
--- a/tests/wpt/tests/css/filter-effects/backdrop-filter-basic-opacity-2.html
+++ b/tests/wpt/tests/css/filter-effects/backdrop-filter-basic-opacity-2.html
@@ -4,6 +4,7 @@
 <link rel="author" href="mailto:masonf@chromium.org">
 <link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
 <link rel="match"  href="backdrop-filter-basic-opacity-2-ref.html">
+<meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-10000">
 
 <div>
   <p>Expected: Just a single grey box.</p>
diff --git a/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html b/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html
new file mode 100644
index 00000000000..69510b28fde
--- /dev/null
+++ b/tests/wpt/tests/device-bound-session-credentials/empty-response.https.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="helper.js" type="module"></script>
+
+<script type="module">
+  import {
+    expireCookie,
+    documentHasCookie,
+    waitForCookie,
+    addCookieAndSessionCleanup,
+    setupShardedServerState,
+    configureServer
+  } from "./helper.js";
+
+  promise_test(async t => {
+    await setupShardedServerState();
+    const expectedCookieAndValue = "auth_cookie=abcdef0123";
+    const expectedCookieAndAttributes = `${expectedCookieAndValue};Domain=${location.hostname};Path=/device-bound-session-credentials`;
+    addCookieAndSessionCleanup(t);
+
+    // Configure the server to omit session instructions going forward
+    configureServer({
+      useEmptyResponse: true
+    });
+
+    // Prompt starting a session, and wait until registration completes.
+    const loginResponse = await fetch('login.py');
+    assert_equals(loginResponse.status, 200);
+    await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
+
+    // Since the session instructions were empty at registration, refresh should fail.
+    expireCookie(expectedCookieAndAttributes);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 401);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+  }, "An empty response fails on registration");
+
+  promise_test(async t => {
+    await setupShardedServerState();
+    const expectedCookieAndValue = "auth_cookie=abcdef0123";
+    const expectedCookieAndAttributes = `${expectedCookieAndValue};Domain=${location.hostname};Path=/device-bound-session-credentials`;
+    addCookieAndSessionCleanup(t);
+
+    // Prompt starting a session, and wait until registration completes.
+    const loginResponse = await fetch('login.py');
+    assert_equals(loginResponse.status, 200);
+    await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
+
+    // Configure the server to omit session instructions going forward
+    configureServer({
+      useEmptyResponse: true
+    });
+
+    // Confirm that expiring the cookie still leads to a request with the cookie set (refresh occurs).
+    expireCookie(expectedCookieAndAttributes);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry.status, 200);
+    assert_true(documentHasCookie(expectedCookieAndValue));
+
+    // If returning an empty response terminated the session, a second refresh would fail.
+    expireCookie(expectedCookieAndAttributes);
+    assert_false(documentHasCookie(expectedCookieAndValue));
+    const authResponseAfterExpiry2 = await fetch('verify_authenticated.py');
+    assert_equals(authResponseAfterExpiry2.status, 200);
+    assert_true(documentHasCookie(expectedCookieAndValue));
+  }, "An empty response is allowed on refresh");
+</script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/session_manager.py b/tests/wpt/tests/device-bound-session-credentials/session_manager.py
index ac43c929025..78ae558c461 100644
--- a/tests/wpt/tests/device-bound-session-credentials/session_manager.py
+++ b/tests/wpt/tests/device-bound-session-credentials/session_manager.py
@@ -50,6 +50,7 @@ class SessionManager:
         self.provider_session_id = None
         self.provider_url = None
         self.provider_key = None
+        self.use_empty_response = False
 
     def next_session_id(self):
         return len(self.session_to_key_map)
@@ -147,6 +148,10 @@ class SessionManager:
         if provider_key is not None:
             self.provider_key = provider_key
 
+        use_empty_response = configuration.get("useEmptyResponse")
+        if use_empty_response is not None:
+            self.use_empty_response = use_empty_response
+
     def get_should_refresh_end_session(self):
         return self.should_refresh_end_session
 
@@ -226,7 +231,8 @@ class SessionManager:
             ("Cache-Control", "no-store")
         ]
 
-        return (200, headers, json.dumps(response_body))
+        response_body = "" if self.use_empty_response else json.dumps(response_body)
+        return (200, headers, response_body)
 
     def get_refresh_endpoint_unavailable(self):
         return self.refresh_endpoint_unavailable
diff --git a/tests/wpt/tests/device-bound-session-credentials/subdomain-registration.https.html b/tests/wpt/tests/device-bound-session-credentials/subdomain-registration.https.html
index 4836ab9688c..2d174a6194a 100644
--- a/tests/wpt/tests/device-bound-session-credentials/subdomain-registration.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/subdomain-registration.https.html
@@ -14,6 +14,31 @@
     waitForCookie
   } from "/device-bound-session-credentials/helper.js";
 
+  async function waitForRefresh(cookieAndAttributes, cookieAndValue, expectRefreshed) {
+    const startTime = Date.now();
+    const refreshed = await new Promise(resolve => {
+      async function tryRefresh() {
+        expireCookie(cookieAndAttributes);
+        assert_false(documentHasCookie(cookieAndValue));
+        const authResponseAfterExpiry = await fetch('verify_authenticated.py');
+        if (authResponseAfterExpiry.status == 200) {
+          resolve(true);
+          return;
+        }
+        if (!expectRefreshed && Date.now() - startTime >= 1000) {
+          resolve(false);
+          return;
+        }
+
+        step_timeout(tryRefresh, 100);
+      }
+
+      tryRefresh();
+    });
+
+    assert_equals(refreshed, expectRefreshed);
+  }
+
   async function runTest(t, subdomain, expectRegistration) {
     await setupShardedServerState();
     const expectedCookieAndValue = "auth_cookie=abcdef0123";
@@ -39,23 +64,13 @@
 
     const loginResponse = await fetch(loginUrl.toString(), {credentials: "include"});
     assert_equals(loginResponse.status, 200);
-    // The registration request happens, which sets the auth_cookie. Then the
-    // .well-known is fetched, which may cause registration to fail
-    // (depending on `expectRegistration`).
-    await waitForCookie('well_known_fetched=true', /*expectCookie=*/ true);
-
-    // Expire the cookie, and check whether a refresh has occurred.
-    expireCookie(expectedCookieAndAttributes);
-    assert_false(documentHasCookie(expectedCookieAndValue));
-    const authResponseAfterExpiry = await fetch('verify_authenticated.py');
-    const authResponseBody = await authResponseAfterExpiry.text();
-    if (expectRegistration) {
-      assert_equals(authResponseAfterExpiry.status, 200, "(response body: " + authResponseBody + ")");
-      assert_true(documentHasCookie(expectedCookieAndValue));
-    } else {
-      assert_equals(authResponseAfterExpiry.status, 401, "(response body: " + authResponseBody + ")");
-      assert_false(documentHasCookie(expectedCookieAndValue));
-    }
+    // Wait for the cookie returned by the server providing the session config to
+    // the user agent.
+    await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
+    // There is still well-known fetching after that, so we can't conclude yet that
+    // registration is finished and has either succeeded or failed as expected.
+    // Trigger repeated refresh attempts to confirm this instead.
+    await waitForRefresh(expectedCookieAndAttributes, expectedCookieAndValue, /*expectRefresh=*/expectRegistration);
   }
 
   promise_test(async t => {
diff --git a/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-for-programmatic-scroll.html b/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-for-programmatic-scroll.html
index 92d69fc8a95..a958ff675c5 100644
--- a/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-for-programmatic-scroll.html
+++ b/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-for-programmatic-scroll.html
@@ -112,10 +112,10 @@ function runTest() {
     let scrollendPromise = null;
     if (testInfo.target == document.scrollingElement) {
       targetDiv.addEventListener("scrollend", onInvalidScrollEnd);
-      scrollendPromise = createScrollendPromiseForTarget(t, document, 700, true);
+      scrollendPromise = createScrollendPromiseForTarget(t, document, 2000, true);
     } else {
       document.addEventListener("scrollend", onInvalidScrollEnd);
-      scrollendPromise = createScrollendPromiseForTarget(t, targetDiv, 700, false);
+      scrollendPromise = createScrollendPromiseForTarget(t, targetDiv, 2000, false);
     }
 
     testInfo.target[testInfo.fn]({ top: 200, left: 200,
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-basic.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-basic.html
index 12b92d743c9..b42186dc637 100644
--- a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-basic.html
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-basic.html
@@ -1,16 +1,13 @@
 <!DOCTYPE html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<body></body>
 <script>
 test(() => {
   const range = new FormControlRange();
-
-  // Constructor functionality.
-  assert_true(range instanceof FormControlRange, "|range| should be an instance of FormControlRange");
-
-  // Inheritance relationships.
-  assert_true(range instanceof AbstractRange, "|range| should also be an instance of AbstractRange");
-  assert_false(range instanceof Range, "|range| should not be an instance of Range");
+  assert_true(range instanceof FormControlRange, "|range| should be an instance of FormControlRange.");
+  assert_true(range instanceof AbstractRange, "|range| should also be an instance of AbstractRange.");
+  assert_false(range instanceof Range, "|range| should not be an instance of Range.");
 }, "Tests FormControlRange constructor and inheritance.");
 
 test(() => {
@@ -22,5 +19,16 @@ test(() => {
   assert_equals(range.startOffset, 0);
   assert_equals(range.endOffset, 0);
   assert_true(range.collapsed);
+  assert_equals(range.toString(), "");
 }, "Tests FormControlRange default values when no form control is set.");
+
+test(() => {
+  document.body.innerHTML = '<input type="text" value="">';
+  const input = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(input, 0, 0);
+  assert_equals(range.toString(), "");
+  assert_true(range.collapsed);
+}, "FormControlRange handles empty value correctly.");
 </script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-offset.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-offset.html
new file mode 100644
index 00000000000..903f2752a6e
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-offset.html
@@ -0,0 +1,132 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body></body>
+<script>
+const controls = ["textarea", "input"];
+
+function setupControl(control, value) {
+  document.body.innerHTML = (control === "input") ? '<input type="text">' : '<textarea></textarea>';
+  const element = document.body.firstElementChild;
+  element.value = value;
+  return element;
+}
+
+controls.forEach(control => {
+  test(() => {
+    const element = setupControl(control, "A");
+    const range = new FormControlRange();
+
+    [[0, 0, "", true], [0, 1, "A", false], [1, 1, "", true]].forEach(([start, end, text, collapsed]) => {
+      range.setFormControlRange(element, start, end);
+      assert_equals(range.toString(), text);
+      assert_equals(range.collapsed, collapsed);
+    });
+  }, `FormControlRange with single character in ${control}.`);
+
+  test(() => {
+    const element = setupControl(control, "");
+    const range = new FormControlRange();
+
+    range.setFormControlRange(element, 0, 0);
+    assert_equals(range.toString(), "");
+    assert_true(range.collapsed);
+  }, `FormControlRange with empty control in ${control}.`);
+
+  test(() => {
+    const element = setupControl(control, "Hello World");
+    const range = new FormControlRange();
+
+    [[0, 5, "Hello"], [5, 6, " "], [6, 11, "World"], [11, 11, ""]].forEach(([start, end, expected]) => {
+      range.setFormControlRange(element, start, end);
+      assert_equals(range.toString(), expected);
+    });
+  }, `FormControlRange boundary positions in ${control}.`);
+
+  test(() => {
+    const testCases = [
+      {
+        // Emoji 😊 with length 2 in UTF-16 ('\uD83D\uDE0A').
+        text: '\u{1F60A}',
+        ranges: [[0, 0, ""], [0, 2, "😊"], [2, 2, ""], [0, 1, "\uD83D"], [1, 2, "\uDE0A"]]
+      },
+      {
+        // ZWJ emoji (👨‍👩‍👧) with length 8 in UTF-16 ('\uD83D\uDC68\u200D\uD83D\uDC69\u200D\uD83D\uDC67').
+        text: '\u{1F468}\u{200D}\u{1F469}\u{200D}\u{1F467}',
+        ranges: [[0, 0, ""], [0, 8, "👨‍👩‍👧"], [8, 8, ""], [0, 2, "👨"], [3, 5, "👩"], [6, 8, "👧"],
+          [1, 2, "\uDC68"], [2, 3, "\u200D"]]
+      },
+      {
+        // Mixed ASCII and emoji 😊.
+        text: 'Hello\u{1F60A}World',
+        ranges: [[0, 5, "Hello"], [5, 7, "😊"], [7, 12, "World"], [0, 12, "Hello😊World"], [3, 6, "lo\uD83D"],
+          [6, 9, "\uDE0AWo"],  [4, 8, "o😊W"]]
+      }
+    ];
+
+    testCases.forEach(testCase => {
+      const element = setupControl(control, testCase.text);
+      const range = new FormControlRange();
+      testCase.ranges.forEach(([start, end, expected]) => {
+        range.setFormControlRange(element, start, end);
+        assert_equals(range.toString(), expected);
+      });
+    });
+  }, `FormControlRange with Unicode characters in ${control}.`);
+});
+
+
+test(() => {
+  // Test textarea with mixed whitespace in light DOM.
+  document.body.innerHTML = '<textarea>  \n\t  Line1\n  Line2  \t\n  </textarea>';
+  const textarea = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  // Whitespace is preserved in textarea.value.
+  range.setFormControlRange(textarea, 0, textarea.value.length);
+  assert_equals(range.toString(), textarea.value);
+  assert_true(range.toString().includes('\n'));
+  assert_true(range.toString().includes('\t'));
+}, "FormControlRange preserves whitespace in textarea light DOM.");
+
+test(() => {
+  document.body.innerHTML = '<textarea>Hello World</textarea>';
+  const textarea = document.body.firstElementChild;
+
+  // Create a complex DOM structure inside the textarea.
+  // Child nodes don't affect the textarea's .value, only text content does.
+  textarea.append(document.createElement("video"));
+  textarea.append(document.createElement("iframe"));
+
+  const span = document.createElement("span");
+  span.innerHTML = "more text";
+  textarea.append(span);
+
+  textarea.append(document.createTextNode("Some rendered content"));
+  textarea.append(document.createTextNode("Some more rendered content"));
+
+  const range = new FormControlRange();
+
+  // FormControlRange uses element.value, which includes text nodes but ignores element children.
+  assert_equals(textarea.value, "Hello WorldSome rendered contentSome more rendered content");
+  range.setFormControlRange(textarea, 0, textarea.value.length);
+  assert_equals(range.toString(), "Hello WorldSome rendered contentSome more rendered content");
+}, "FormControlRange should work correctly with weirdly formed light DOM structure.");
+
+test(() => {
+  // Test input with child nodes (which shouldn't exist but might)
+  document.body.innerHTML = '<input type="text" value="Original">';
+  const input = document.body.firstElementChild;
+
+  // Malformed: add child nodes to input (shouldn't affect value).
+  input.appendChild(document.createTextNode("Ignored"));
+  input.appendChild(document.createElement("span")).textContent = "AlsoIgnored";
+
+  const range = new FormControlRange();
+  range.setFormControlRange(input, 0, input.value.length);
+
+  // Input.value is unaffected by child nodes.
+  assert_equals(range.toString(), "Original");
+}, "FormControlRange ignores malformed input child nodes.");
+</script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-range-updates.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-range-updates.html
new file mode 100644
index 00000000000..da38386ead4
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-range-updates.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body></body>
+<script>
+test(() => {
+  document.body.innerHTML = '<textarea>Hello World</textarea>';
+  const textarea = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(textarea, 0, 5);
+  assert_equals(range.toString(), "Hello");
+
+  range.setFormControlRange(textarea, 6, 11);
+  assert_equals(range.toString(), "World");
+  assert_equals(range.startOffset, 6);
+  assert_equals(range.endOffset, 11);
+}, "FormControlRange allows updating range on same element.");
+
+test(() => {
+  document.body.innerHTML = '<input type="text" value="Test"><textarea>Other</textarea>';
+  const input = document.body.children[0];
+  const textarea = document.body.children[1];
+  const range = new FormControlRange();
+
+  // Set range on <input>.
+  range.setFormControlRange(input, 0, 4);
+  assert_equals(range.startContainer, input);
+  assert_equals(range.endContainer, input);
+  assert_equals(range.toString(), "Test");
+
+  // Switch to different element <textarea>.
+  range.setFormControlRange(textarea, 0, 5);
+  assert_equals(range.startContainer, textarea);
+  assert_equals(range.endContainer, textarea);
+  assert_equals(range.toString(), "Other");
+}, "FormControlRange can switch between different form controls.");
+
+test(() => {
+  // Create disconnected form controls (not in document).
+  const container = document.createElement("div");
+  container.innerHTML = '<input type="text" value="Disconnected"><textarea>NotConnected</textarea>';
+  const input = container.children[0];
+  const textarea = container.children[1];
+  const range = new FormControlRange();
+
+  // Verify disconnected <input>.
+  range.setFormControlRange(input, 0, 12);
+  assert_equals(range.startContainer, input);
+  assert_equals(range.endContainer, input);
+  assert_equals(range.toString(), "Disconnected");
+
+  // Verify disconnected <textarea>.
+  range.setFormControlRange(textarea, 3, 12);
+  assert_equals(range.startContainer, textarea);
+  assert_equals(range.endContainer, textarea);
+  assert_equals(range.toString(), "Connected");
+
+  // Connect to document.
+  document.body.appendChild(container);
+
+  range.setFormControlRange(input, 0, 4);
+  assert_equals(range.toString(), "Disc");
+
+  range.setFormControlRange(textarea, 0, 3);
+  assert_equals(range.toString(), "Not");
+}, "FormControlRange works with disconnected and then connected form controls.");
+
+test(() => {
+  document.body.innerHTML = '<textarea>Connected</textarea>';
+  const connectedTextarea = document.body.firstElementChild;
+
+  const disconnectedInput = document.createElement("input");
+  disconnectedInput.type = "text";
+  disconnectedInput.value = "Floating";
+
+  const range = new FormControlRange();
+
+  // Start verifying with connected element.
+  range.setFormControlRange(connectedTextarea, 0, 9);
+  assert_equals(range.toString(), "Connected");
+
+  // Switch to disconnected element.
+  range.setFormControlRange(disconnectedInput, 0, 8);
+  assert_equals(range.toString(), "Floating");
+  assert_equals(range.startContainer, disconnectedInput);
+
+  // Switch back to connected element.
+  range.setFormControlRange(connectedTextarea, 3, 6);
+  assert_equals(range.toString(), "nec");
+  assert_equals(range.startContainer, connectedTextarea);
+}, "FormControlRange can switch between connected and disconnected form controls.");
+
+test(() => {
+  document.body.innerHTML = '<textarea>Original</textarea>';
+  const textarea = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(textarea, 1, 5);
+  assert_equals(range.toString(), "rigi");
+
+  textarea.value = "Modified";
+  assert_equals(range.toString(), "odif");
+}, "FormControlRange reflects value changes on same element.");
+</script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-supported-elements.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-supported-elements.html
new file mode 100644
index 00000000000..92d9b2437c3
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-supported-elements.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body></body>
+<script>
+test(() => {
+  [
+    { html: '<textarea>Hello world</textarea>', name: 'textarea' },
+    { html: '<input type="text" value="Sample text">', name: 'input[type=text]' },
+    { html: '<input type="search" value="search query">', name: 'input[type=search]' },
+    { html: '<input type="password" value="secret123">', name: 'input[type=password]' },
+    { html: '<input type="url" value="https://example.com">', name: 'input[type=url]' },
+    { html: '<input type="tel" value="+1-555-123-4567">', name: 'input[type=tel]' }
+  ].forEach(({ html, name }) => {
+    test(() => {
+      document.body.innerHTML = html;
+      const element = document.body.firstElementChild;
+      const range = new FormControlRange();
+      const value = element.value || element.textContent;
+
+      range.setFormControlRange(element, 0, value.length);
+
+      assert_equals(range.startContainer, element);
+      assert_equals(range.endContainer, element);
+      assert_equals(range.toString(), value);
+    }, `FormControlRange should support ${name}.`);
+  });
+}, "FormControlRange supported elements.");
+</script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-toString.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-toString.html
new file mode 100644
index 00000000000..2ae86946264
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-toString.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body></body>
+<script>
+test(() => {
+  document.body.innerHTML = '<input type="text" value="Test">';
+  const input = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(input, 0, 4);
+  assert_equals(range.toString(), "Test");
+
+  input.value = "New";
+  assert_equals(range.toString(), "New");
+}, "FormControlRange toString() reflects current value.");
+
+test(() => {
+  document.body.innerHTML = '<input type="text" value="Hello">';
+  const input = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(input, 1, 4);
+  input.value = "Hi";
+  assert_equals(range.toString(), "i");
+}, "FormControlRange toString() clamps to available length.");
+
+test(() => {
+  document.body.innerHTML = '<textarea>LongText</textarea>';
+  const textarea = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(textarea, 2, 6);
+  // Value length is shorter than range.
+  textarea.value = "Hi";
+  assert_equals(range.toString(), "");
+}, "FormControlRange toString() handles value shorter than range.");
+
+test(() => {
+  document.body.innerHTML = '<input type="text" value="Test">';
+  const input = document.body.firstElementChild;
+  const range = new FormControlRange();
+
+  range.setFormControlRange(input, 3, 1);
+  assert_equals(range.toString(), "");
+  assert_true(range.collapsed);
+}, "FormControlRange toString() handles auto-collapsed backwards ranges.");
+
+test(() => {
+  // Test input with value attribute vs IDL value.
+  document.body.innerHTML = '<input type="text" value="AttrValue">';
+  const input = document.body.firstElementChild;
+
+  input.value = "NewValue";
+
+  const range = new FormControlRange();
+  range.setFormControlRange(input, 0, input.value.length);
+
+  // FormControlRange should use current .value, not attribute.
+  assert_equals(range.toString(), "NewValue");
+
+  input.setAttribute("value", "AttrChanged");
+  assert_equals(input.value, "NewValue");
+  assert_equals(range.toString(), "NewValue");
+
+}, "FormControlRange uses current input.value, not value attribute.");
+</script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-unsupported-elements.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-unsupported-elements.html
new file mode 100644
index 00000000000..60d9681965c
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-unsupported-elements.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/resources/common.js"></script>
+<body></body>
+<script>
+test(() => {
+  const range = new FormControlRange();
+  const textNode = document.createTextNode("test");
+  assert_throws_dom("NotSupportedError", () => {
+    range.setFormControlRange(textNode, 0, 0);
+  });
+}, "FormControlRange throws NotSupportedError for text node.");
+
+// Test all HTML5 elements; only <textarea> and <input> support FormControlRange.
+test(() => {
+  const supportedElements = ['textarea', 'input'];
+
+  HTML5_ELEMENTS.forEach(elementName => {
+    if (supportedElements.includes(elementName)) {
+      return;
+    }
+
+    var doc = newHTMLDocument();
+    const element = doc.createElement(elementName);
+    doc.body.appendChild(element);
+
+    const range = new FormControlRange();
+    assert_throws_dom("NotSupportedError", () => {
+      range.setFormControlRange(element, 0, 0);
+    }, `FormControlRange should throw NotSupportedError for ${element.outerHTML}`);
+  });
+}, "FormControlRange should throw NotSupportedError for all unsupported HTML5 elements.");
+
+// Test all HTML5_INPUT_TYPES.
+// Only these input types support the Selection API: text, search, url, tel, password.
+// https://html.spec.whatwg.org/multipage/input.html#do-not-apply
+
+test(() => {
+  const supportedInputTypes = ['text', 'search', 'url', 'tel', 'password'];
+
+  HTML5_INPUT_TYPES.forEach(inputType => {
+    if (supportedInputTypes.includes(inputType)) {
+      return;
+    }
+    var doc = newHTMLDocument();
+    var input = doc.createElement('input');
+    input.type = inputType;
+    doc.body.appendChild(input);
+
+    const range = new FormControlRange();
+
+    assert_throws_dom("NotSupportedError", () => {
+      range.setFormControlRange(input, 0, 0);
+    }, `FormControlRange should throw NotSupportedError for ${input.outerHTML}`);
+  });
+}, "FormControlRange should throw NotSupportedError for unsupported input types.");
+
+// Test which error "wins" when both element type and index are invalid.
+test(() => {
+  var doc = newHTMLDocument();
+  doc.body.innerHTML = '<div contenteditable>Test</div>';
+  const element = doc.body.firstElementChild;
+
+  const range = new FormControlRange();
+
+  // Both element type (div) and index (-1, 100) are invalid.
+  assert_throws_dom("NotSupportedError", () => {
+    range.setFormControlRange(element, -1, 100);
+  });
+}, "NotSupportedError should take precedence over IndexSizeError when both element type and index are invalid for a FormControlRange.");
+</script>
diff --git a/tests/wpt/tests/dom/ranges/tentative/FormControlRange-validation.html b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-validation.html
new file mode 100644
index 00000000000..cffc88894f4
--- /dev/null
+++ b/tests/wpt/tests/dom/ranges/tentative/FormControlRange-validation.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+  <textarea>Hello</textarea>
+</body>
+<script>
+test(() => {
+  const textarea = document.querySelector('textarea');
+  const range = new FormControlRange();
+
+  range.setFormControlRange(textarea, 1, 4);
+  assert_equals(range.toString(), "ell");
+
+  assert_throws_dom("IndexSizeError", () => range.setFormControlRange(textarea, 10, 15));
+  assert_equals(range.toString(), "ell", "State preserved after error");
+  assert_equals(range.startOffset, 1, "Start offset preserved");
+  assert_equals(range.endOffset, 4, "End offset preserved");
+}, "FormControlRange preserves state when setFormControlRange throws.");
+
+test(() => {
+  const textarea = document.querySelector('textarea');
+  const range = new FormControlRange();
+
+  // [start, end, shouldThrow, expectedStart, expectedEnd, expectedText, expectedCollapsed].
+  [
+    // Valid forward ranges.
+    [0, 5, false, 0, 5, "Hello", false],
+    [1, 4, false, 1, 4, "ell", false],
+    [0, 0, false, 0, 0, "", true],
+    [5, 5, false, 5, 5, "", true],
+
+    // Backwards ranges that auto-collapse, but don't throw.
+    [5, 2, false, 5, 5, "", true],
+    [4, 1, false, 4, 4, "", true],
+    [3, 0, false, 3, 3, "", true],
+
+    // Ranges that are out-of-bounds and should throw.
+    // End offset exceeds value length.
+    [0, 6, true],
+    // Start offset exceeds value length.
+    [6, 6, true],
+    // Both start and end offset exceeds length in a backwards range.
+    [10, 5, true],
+    // Both start and end offsets exceeds value length in a forward range.
+    [10, 15, true],
+  ].forEach(([start, end, shouldThrow, expectedStart, expectedEnd, expectedText, expectedCollapsed]) => {
+    if (shouldThrow) {
+      assert_throws_dom("IndexSizeError", () => range.setFormControlRange(textarea, start, end),
+                       `[${start}, ${end}] should throw`);
+    } else {
+      range.setFormControlRange(textarea, start, end);
+      assert_equals(range.startOffset, expectedStart, `[${start}, ${end}] startOffset`);
+      assert_equals(range.endOffset, expectedEnd, `[${start}, ${end}] endOffset`);
+      assert_equals(range.toString(), expectedText, `[${start}, ${end}] toString`);
+      assert_equals(range.collapsed, expectedCollapsed, `[${start}, ${end}] collapsed`);
+    }
+  });
+}, "FormControlRange handles all range types correctly: forward, backwards, and out-of-bounds.");
+</script>
diff --git a/tests/wpt/tests/domparsing/insert_adjacent_html-001-crash.html b/tests/wpt/tests/domparsing/insert_adjacent_html-001-crash.html
new file mode 100644
index 00000000000..3b57aa5b051
--- /dev/null
+++ b/tests/wpt/tests/domparsing/insert_adjacent_html-001-crash.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1219068">
+<span id="span">A</span>
+<script>
+  onload = _ => span.insertAdjacentHTML("beforeEnd", undefined)
+</script>
diff --git a/tests/wpt/tests/domparsing/insert_adjacent_html.html b/tests/wpt/tests/domparsing/insert_adjacent_html.html
index d8b38748198..b58852f7087 100644
--- a/tests/wpt/tests/domparsing/insert_adjacent_html.html
+++ b/tests/wpt/tests/domparsing/insert_adjacent_html.html
@@ -88,6 +88,18 @@ test(function() {
   assert_equals(document.getElementsByTagName("head").length, 1, "Should still have one head");
   assert_equals(document.getElementsByTagName("body").length, 1, "Should still have one body");
 }, "Inserting kids of the <html> element should not do weird things with implied <body>/<head> tags")
+
+test(function() {
+  let div = document.createElement("div");
+  div.appendChild(document.createTextNode("A"));
+  div.insertAdjacentHTML("beforeEnd", "B");
+  assert_true(div.firstChild && div.firstChild.nextSibling &&
+              !div.firstChild.nextSibling.nextSibling,
+              "div has two children");
+  assert_equals(div.firstChild.textContent, "A");
+  assert_equals(div.lastChild.textContent, "B");
+}, "A text node inserted via insertAdjacentHTML should not be merged with a sibling text node.");
+
 </script>
 <div id="log"></div>
 </body>
diff --git a/tests/wpt/tests/element-timing/WEB_FEATURES.yml b/tests/wpt/tests/element-timing/WEB_FEATURES.yml
new file mode 100644
index 00000000000..0cfa44c01ef
--- /dev/null
+++ b/tests/wpt/tests/element-timing/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: element-timing
+  files: "**"
diff --git a/tests/wpt/tests/fetch/fetch-later/META.yml b/tests/wpt/tests/fetch/fetch-later/META.yml
index f8fd46bec3e..4e217c63e83 100644
--- a/tests/wpt/tests/fetch/fetch-later/META.yml
+++ b/tests/wpt/tests/fetch/fetch-later/META.yml
@@ -1,3 +1,3 @@
-spec: https://whatpr.org/fetch/1647/094ea69...152d725.html#fetch-later-method
+spec: https://fetch.spec.whatwg.org/#dom-window-fetchlater
 suggested_reviewers:
   - mingyc
diff --git a/tests/wpt/tests/fetch/fetch-later/README.md b/tests/wpt/tests/fetch/fetch-later/README.md
index d70ad217b1c..603fe05de3f 100644
--- a/tests/wpt/tests/fetch/fetch-later/README.md
+++ b/tests/wpt/tests/fetch/fetch-later/README.md
@@ -1,3 +1,3 @@
-# FetchLater Tests
+# `fetchLater()` Tests
 
-These tests cover [FetchLater method](https://whatpr.org/fetch/1647.html#dom-window-fetchlater) related behaviors.
+These tests cover [`fetchLater()` method](https://fetch.spec.whatwg.org/#dom-window-fetchlater) related behaviors.
diff --git a/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html b/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
index 7619709706a..da0e539a4d9 100644
--- a/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
+++ b/tests/wpt/tests/hsts/third-party-subframe-hsts-upgrade.tentative.sub.html
@@ -77,7 +77,7 @@
     await fetch(`https://${CURRENT_HOST_HTTPS_PORT}/hsts/resources/hsts.html?as-fetch`);
 
     // Step 4.
-    const hstsWindowPromise = onMessageWithTimeout("Step 3")
+    const hstsWindowPromise = onMessageWithTimeout("Step 4")
     .then((event) =>
       assert_equals(event.data.origin,
                     `https://${CURRENT_HOST_HTTPS_PORT}`));
diff --git a/tests/wpt/tests/html/editing/dnd/drop/001.xhtml b/tests/wpt/tests/html/editing/dnd/drop/001.xhtml
index c34aef97349..32dd0f7fa0c 100644
--- a/tests/wpt/tests/html/editing/dnd/drop/001.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/drop/001.xhtml
@@ -1,38 +1,78 @@
 <?xml version="1.0" encoding="utf-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml">
+<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 src="/resources/testdriver-actions.js"></script>
+<script src="../resources/test-helper.js"></script>
 <head>
-<title>Selection drag and drop: allowed effects 'copy','move','link'</title>
-<style type="text/css">
-div
-  {display:inline-block;
-  vertical-align:top;
-  background-color:olive;
-  color:white;
-  padding:20px;
-  width:100px;
-  height:100px;}
-div:nth-child(2)
-  {background-color:green;}
-div:nth-child(3)
-  {background-color:teal;}
-</style>
-<script type="application/ecmascript">
-var effects = ['copy','move','link'], i = 0;
-function selectText()
-  {window.getSelection().selectAllChildren(document.querySelector('p'))}
-function dropSelection(event)
-  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
-  i = (i + 1)%3;
-  selectText();}
-function start(event)
-  {event.dataTransfer.effectAllowed = effects[i]}
-</script>
+  <title>dropEffect is correctly set when it matches effectAllowed</title>
+  <style type="text/css">
+    div {
+      display: inline-block;
+      vertical-align: top;
+      background-color: olive;
+      color: white;
+      padding: 20px;
+      width: 100px;
+      height: 100px;
+    }
+
+    div:nth-child(2) {
+      background-color: green;
+    }
+
+    div:nth-child(3) {
+      background-color: teal;
+    }
+
+  </style>
 </head>
-<body onload="selectText()">
-<p ondragstart="start(event)">Drag me</p>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
-<p>You should be able to drag selection and drop it onto any of the green boxes.</p>
+<body>
+  <p>
+    Drag these boxes. Each box has a different effectAllowed.
+  </p>
+  <p>
+  <div id="copy-drag" draggable="true"
+    ondragstart="event.dataTransfer.effectAllowed = 'copy'">copy</div>
+  <div id="move-drag" draggable="true"
+    ondragstart="event.dataTransfer.effectAllowed = 'move'">move</div>
+  <div id="link-drag" draggable="true"
+    ondragstart="event.dataTransfer.effectAllowed = 'link'">link</div>
+  </p>
+  <p>
+    Drop on these boxes. Each box has a different dropEffect.
+  </p>
+  <p>
+    <div id="copy-drop" ondragover="onDragOver(event, 'copy')">copy</div>
+    <div id="move-drop" ondragover="onDragOver(event, 'move')">move</div>
+    <div id="link-drop" ondragover="onDragOver(event, 'link')">link</div>
+  </p>
 </body>
+<script>
+  function onDragOver(event, effectAllowed) {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = effectAllowed;
+  }
+
+  async function test() {
+    await new Promise(loaded => window.addEventListener("load", loaded));
+
+    function onDropCallBack(event) {
+      assert_equals(event.target.textContent, event.dataTransfer.dropEffect);
+      assert_equals(event.target.textContent, event.dataTransfer
+        .effectAllowed);
+      return true;
+    }
+    for (const effect of ['copy', 'move', 'link']) {
+      const dragDiv = document.getElementById(effect + '-drag');
+      const dropDiv = document.getElementById(effect + '-drop');
+      dragDropTest(
+        dragDiv, dropDiv, onDropCallBack,
+        'dropEffect should match effectAllowed on drop for ' + effect);
+    }
+  }
+  test();
+</script>
 </html>
diff --git a/tests/wpt/tests/html/editing/dnd/images/015.html b/tests/wpt/tests/html/editing/dnd/images/015.html
index d1ffb9cb36c..18b86cb004d 100644
--- a/tests/wpt/tests/html/editing/dnd/images/015.html
+++ b/tests/wpt/tests/html/editing/dnd/images/015.html
@@ -44,6 +44,7 @@
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const div = document.querySelector('div');
 
@@ -53,7 +54,8 @@
       }
 
       dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the horizontal scrollbar within a scrollable block element should copy it there');
+        'Dragging the image to the horizontal scrollbar within a scrollable block element should copy it there',
+        /*dragIframe=*/ null, /*dropIframe=*/ null, DropPosition.HORIZONTAL_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/016.html b/tests/wpt/tests/html/editing/dnd/images/016.html
index 40edee38ee0..9aa46c58b93 100644
--- a/tests/wpt/tests/html/editing/dnd/images/016.html
+++ b/tests/wpt/tests/html/editing/dnd/images/016.html
@@ -43,6 +43,7 @@
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const div = document.querySelector('div');
 
@@ -52,7 +53,8 @@
       }
 
       dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the vertical scrollbar within a scrollable block element should copy it there');
+        'Dragging the image to the vertical scrollbar within a scrollable block element should copy it there',
+        /*dragIframe=*/ null, /*dropIframe=*/ null, DropPosition.RIGHT_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/017.html b/tests/wpt/tests/html/editing/dnd/images/017.html
index 9abeea5514c..22fe4f8a2c2 100644
--- a/tests/wpt/tests/html/editing/dnd/images/017.html
+++ b/tests/wpt/tests/html/editing/dnd/images/017.html
@@ -49,6 +49,7 @@
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const div = document.querySelector('div');
 
@@ -57,7 +58,9 @@
         return true;
       }
 
-      dragDropTest(img, div, onDropCallBack, 'Dragging the image to the horizontal scrollbar should copy it there');
+      dragDropTest(img, div, onDropCallBack,
+        'Dragging the image to the horizontal scrollbar should copy it there',
+        /*dragIframe=*/ null, /*dropIframe=*/ null, DropPosition.HORIZONTAL_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/018.html b/tests/wpt/tests/html/editing/dnd/images/018.html
index 1764c38a383..1a5f2286b3c 100644
--- a/tests/wpt/tests/html/editing/dnd/images/018.html
+++ b/tests/wpt/tests/html/editing/dnd/images/018.html
@@ -49,6 +49,7 @@
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const div = document.querySelector('div');
 
@@ -57,7 +58,9 @@
         return true;
       }
 
-      dragDropTest(img, div, onDropCallBack, 'Dragging the image to the vertical scrollbar should copy it there');
+      dragDropTest(img, div, onDropCallBack,
+        'Dragging the image to the vertical scrollbar should copy it there',
+        /*dragIframe=*/ null, /*dropIframe=*/ null, DropPosition.RIGHT_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/021.html b/tests/wpt/tests/html/editing/dnd/images/021.html
index 23c1c6c03ca..6fb39f45678 100644
--- a/tests/wpt/tests/html/editing/dnd/images/021.html
+++ b/tests/wpt/tests/html/editing/dnd/images/021.html
@@ -6,7 +6,7 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="../resources/test-helper.js"></script>
 <head>
-  <title>Dropping image on horizontal iframe scrollbar</title>
+  <title>Dropping image on the root scrollbar of an iframe. No drop event should be sent.</title>
   <style type="text/css">
     p:first-child {
       padding-left: 1em;
@@ -32,23 +32,20 @@
   <p><img
       src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVR42mNgaGD4D8YwBgAw9AX9Y9zBwwAAAABJRU5ErkJggg=="
       alt="PNG green pixel" ondragstart="dragImage()" /></p>
-  <p>Drag little square above and drop it on horizontal scrollbar. Word PASS should appear once you drop it.</p>
+  <p>Drag little square above and drop it on horizontal scrollbar. The drop event should not be sent, and the word PASS should not appear in the iframe.</p>
   <iframe src="helper-drop-horizontal-scrollbar.xhtml">XHTML document</iframe>
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const iframe = document.querySelector('iframe');
       const innerDoc = iframe.contentDocument || iframe.contentWindow.document;
       const div = innerDoc.querySelector('div');
 
-      function onDropCallBack(event) {
-        assert_equals(div.textContent, 'PASS');
-        return true;
-      }
-
-      dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the horizontal iframe scrollbar should copy it there', /*dragIframe=*/ null, iframe);
+      dragDropTestNoDropEvent(img, div,
+        'Dragging the image to the horizontal iframe scrollbar should NOT trigger drop event',
+        /*dragIframe=*/ null, iframe, DropPosition.HORIZONTAL_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/022.xhtml b/tests/wpt/tests/html/editing/dnd/images/022.xhtml
index 6a8d8f65b5e..3afdd875d59 100644
--- a/tests/wpt/tests/html/editing/dnd/images/022.xhtml
+++ b/tests/wpt/tests/html/editing/dnd/images/022.xhtml
@@ -7,7 +7,7 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="../resources/test-helper.js"></script>
 <head>
-  <title>Dropping image on vertical iframe scrollbar</title>
+  <title>Dropping image on the root scrollbar of an iframe. No drop event should be sent.</title>
   <style type="text/css">
     p:first-child {
       padding-left: 1em;
@@ -33,22 +33,20 @@
   <p><img
       src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVR42mNgaGD4D8YwBgAw9AX9Y9zBwwAAAABJRU5ErkJggg=="
       alt="PNG green pixel" ondragstart="dragImage()" /></p>
-  <p>Drag little square above and drop it on vertical scrollbar. Word PASS should appear once you drop it.</p>
+  <p>Drag little square above and drop it on vertical scrollbar. The drop event should not be sent, and the word PASS should not appear in the iframe.</p>
   <iframe src="helper-drop-vertical-scrollbar.xhtml">XHTML document</iframe>
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const iframe = document.querySelector('iframe');
       const innerDoc = iframe.contentDocument || iframe.contentWindow.document;
       const div = innerDoc.querySelector('div');
 
-      function onDropCallBack(event) {
-        assert_equals(innerDoc.querySelector('div').textContent, 'PASS');
-        return true;
-      }
-      dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the vertical iframe scrollbar should copy it there', /*dragIframe=*/ null, iframe);
+      dragDropTestNoDropEvent(img, div,
+        'Dragging the image to the vertical iframe scrollbar should NOT trigger drop event',
+        /*dragIframe=*/ null, iframe, DropPosition.RIGHT_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/023.html b/tests/wpt/tests/html/editing/dnd/images/023.html
index 7109fde453b..f2f8fe330b2 100644
--- a/tests/wpt/tests/html/editing/dnd/images/023.html
+++ b/tests/wpt/tests/html/editing/dnd/images/023.html
@@ -6,7 +6,7 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="../resources/test-helper.js"></script>
 <head>
-  <title>Dropping image on horizontal object scrollbar</title>
+  <title>Dropping image on the root scrollbar of an object. No drop event should be sent.</title>
   <style type="text/css">
     p:first-child {
       padding-left: 1em;
@@ -32,23 +32,20 @@
   <p><img
       src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVR42mNgaGD4D8YwBgAw9AX9Y9zBwwAAAABJRU5ErkJggg=="
       alt="PNG green pixel" ondragstart="dragImage()" /></p>
-  <p>Drag little square above and drop it on horizontal scrollbar. Word PASS should appear once you drop it.</p>
+  <p>Drag little square above and drop it on horizontal scrollbar. The drop event should not be sent, and the word PASS should not appear in the object.</p>
   <object type="text/html" data="helper-drop-horizontal-scrollbar.xhtml">XHTML document</object>
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const object = document.querySelector('object');
       const objDoc = object.contentDocument || object.contentWindow.document;
       const div = objDoc.querySelector('div');
 
-      function onDropCallBack(event) {
-        assert_equals(div.textContent, 'PASS');
-        return true;
-      }
-
-      dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the horizontal object scrollbar should copy it there', /*dragIframe=*/ null, object);
+      dragDropTestNoDropEvent(img, div,
+        'Dragging the image to the horizontal object scrollbar should NOT trigger drop event',
+        /*dragIframe=*/ null, object, DropPosition.HORIZONTAL_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/images/024.html b/tests/wpt/tests/html/editing/dnd/images/024.html
index f2814ced61e..4770378c497 100644
--- a/tests/wpt/tests/html/editing/dnd/images/024.html
+++ b/tests/wpt/tests/html/editing/dnd/images/024.html
@@ -6,7 +6,7 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="../resources/test-helper.js"></script>
 <head>
-  <title>Dropping image on vertical object scrollbar</title>
+  <title>Dropping image on the root scrollbar of an object. No drop event should be sent.</title>
   <style type="text/css">
     p:first-child {
       padding-left: 1em;
@@ -32,23 +32,20 @@
   <p><img
       src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVR42mNgaGD4D8YwBgAw9AX9Y9zBwwAAAABJRU5ErkJggg=="
       alt="PNG green pixel" ondragstart="dragImage()" /></p>
-  <p>Drag little square above and drop it on vertical scrollbar. Word PASS should appear once you drop it.</p>
+  <p>Drag little square above and drop it on vertical scrollbar. The drop event should not be sent, and the word PASS should not appear in the object.</p>
   <object type="application/xhtml+xml" data="helper-drop-vertical-scrollbar.xhtml">XHTML document</object>
   <script>
     async function test() {
       await new Promise(loaded => window.addEventListener("load", loaded));
+
       const img = document.querySelector('img');
       const object = document.querySelector('object');
       const objDoc = object.contentDocument || object.contentWindow.document;
       const div = objDoc.querySelector('div');
 
-      function onDropCallBack(event) {
-        assert_equals(div.textContent, 'PASS');
-        return true;
-      }
-
-      dragDropTest(img, div, onDropCallBack,
-        'Dragging the image to the vertical object scrollbar should copy it there', /*dragIframe=*/ null, object);
+      dragDropTestNoDropEvent(img, div,
+        'Dragging the image to the vertical object scrollbar should NOT trigger drop event',
+        /*dragIframe=*/ null, object, DropPosition.RIGHT_SCROLLBAR);
     }
     test();
   </script>
diff --git a/tests/wpt/tests/html/editing/dnd/resources/test-helper.js b/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
index 652977c7a51..ebc945b5f05 100644
--- a/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
+++ b/tests/wpt/tests/html/editing/dnd/resources/test-helper.js
@@ -1,5 +1,12 @@
 'use strict';
 
+const DropPosition = Object.freeze({
+  CENTER: 'center',
+  RIGHT_SCROLLBAR: 'right_scrollbar',
+  LEFT_SCROLLBAR: 'left_scrollbar',
+  HORIZONTAL_SCROLLBAR: 'horizontal_scrollbar',
+});
+
 // This method calculates the center of an element in an iframe in the
 // coordinate space of the top frame. We need this because TestDriver doesn't
 // support Actions `{origin}`s across two different frames.
@@ -13,6 +20,16 @@ const getElemCenterInIframe = (element, iframe) => {
   return [centerX, centerY];
 };
 
+// This is a helper method that moves the pointer to the specified
+// position (center or scrollbar) of the element.
+const movePointerToPosition = (element, iframe, position, actions) => {
+  if (position === DropPosition.CENTER) {
+    return movePointerToCenter(element, iframe, actions);
+  } else {
+    return movePointerToScrollbar(element, iframe, position, actions);
+  }
+}
+
 // This method appends a pointer move action to the `actions` argument that
 // moves the pointer to the center of the `element` and returns it.
 const movePointerToCenter = (element, iframe, actions) => {
@@ -21,16 +38,72 @@ const movePointerToCenter = (element, iframe, actions) => {
   }) : actions.pointerMove(...getElemCenterInIframe(element, iframe))
 }
 
+// Moves the pointer to the center of the specified scrollbar of the element.
+const movePointerToScrollbar = (element, iframe, scrollbarPosition, actions) => {
+
+  const thickness = calculateScrollbarThickness();
+  assert_greater_than(thickness, 0,
+    'movePointerToScrollbar should not be called when overlay scrollbars are enabled');
+
+  const hasVerticalScrollbar = (element, iframe) => {
+    if (iframe == undefined) {
+      return element.scrollHeight > element.clientHeight;
+    }
+    // If the element is in an iframe, it will become scrollable if
+    // its scrollHeight is larger than the containing frame.
+    return element.scrollHeight > iframe.clientHeight;
+  };
+
+  const hasHorizontalScrollbar = (element, iframe) => {
+  if (iframe == undefined) {
+      return element.scrollWidth > element.clientWidth;
+    }
+    // If the element is in an iframe, it will become scrollable if
+    // its scrollWidth is larger than the containing frame.
+    return element.scrollWidth > iframe.clientWidth;
+  };
+
+  // If the element is inside a frame, the tests will attempt to drop over the document's root
+  // scrollbars. With this in mind, we calculate the scrollbar's position relative to the frame's
+  // rectangle instead of the inner element.
+  const rect = iframe ? iframe.getBoundingClientRect() : element.getBoundingClientRect();
+  let x, y;
+
+  if (scrollbarPosition === DropPosition.LEFT_SCROLLBAR &&
+      hasVerticalScrollbar(element, iframe)) {
+    x = rect.left + thickness / 2;
+    y = rect.top + (rect.height / 2);
+  } else if (scrollbarPosition === DropPosition.RIGHT_SCROLLBAR &&
+      hasVerticalScrollbar(element, iframe)) {
+    x = rect.right - thickness / 2;
+    y = rect.top + (rect.height / 2);
+  } else if (scrollbarPosition === DropPosition.HORIZONTAL_SCROLLBAR &&
+      hasHorizontalScrollbar(element, iframe)) {
+    // Horizontal scrollbar is positioned at the bottom.
+    x = rect.left + (rect.width / 2);
+    y = rect.bottom - thickness / 2;
+  } else {
+    throw new Error('Invalid position specified for scrollbar.');
+  }
+
+  return actions.pointerMove(x, y);
+}
+
 // The dragDropTest function can be used for tests which require the drag and drop movement.
-// `dragElement` takes the element that needs to be dragged and `dropElement` is the element which
-// you want to drop the `dragElement` on. `onDropCallback` is called on the onDrop handler and the
-// test will only pass if this function returns true. Also, if the `dropElement` is inside an
-// iframe, use the optional `iframe` parameter to specify an iframe element that contains the
-// `dropElement` to ensure that tests with an iframe pass.
-// TODO(https://crbug.com/426228061): Some tests were written to drag into scrollbars
-// instead of the center of the element, this function should be expanded to accommodate them.
+// `dragElement` takes the element that needs to be dragged. `dropElement` and `dropPosition`
+// is where you want to drop the `dragElement` on. By default, `dropPosition` is CENTER,
+// which means the center of the `dropElement`. And it can also target to the scrollbar of
+// `dropElement` (see DropPosition enum). `onDropCallBack` is called on the onDrop handler
+// and the test will only pass if this function returns true. Also, if the `dropElement`
+// is inside an iframe, use the optional `iframe` parameter to specify an iframe element
+// that contains the `dropElement` to ensure that tests with an iframe pass.
 function dragDropTest(dragElement, dropElement, onDropCallBack, testDescription,
-  dragIframe = undefined, dropIframe = undefined) {
+  dragIframe = undefined, dropIframe = undefined, dropPosition = DropPosition.CENTER) {
+  // Only verifies drop on scrollbar tests if non-overlay scrollbar is present.
+  // Skips the test on platforms with overlay scrollbars.
+  if (dropPosition !== DropPosition.CENTER && calculateScrollbarThickness() <= 0) {
+    return;
+  }
   promise_test((t) => new Promise(async (resolve, reject) => {
     dropElement.addEventListener('drop', t.step_func((event) => {
       if (onDropCallBack(event) == true) {
@@ -43,7 +116,7 @@ function dragDropTest(dragElement, dropElement, onDropCallBack, testDescription,
       var actions = new test_driver.Actions();
       actions = movePointerToCenter(dragElement, dragIframe, actions)
         .pointerDown();
-      actions = movePointerToCenter(dropElement, dropIframe, actions)
+      actions = movePointerToPosition(dropElement, dropIframe, dropPosition, actions)
         .pointerUp();
       await actions.send();
     } catch (e) {
@@ -51,3 +124,62 @@ function dragDropTest(dragElement, dropElement, onDropCallBack, testDescription,
     }
   }, testDescription));
 }
+
+// The dragDropTestNoDropEvent function performs a drag-and-drop test but expects
+// no drop event to occur. This is useful for testing scenarios where drag-and-drop
+// should be blocked or ignored (e.g., dropping on root scrollbars). The test
+// passes if no drop event fires within the timeout period, and fails immediately
+// if any drop event occurs.
+function dragDropTestNoDropEvent(dragElement, dropElement, testDescription,
+  dragIframe = undefined, dropIframe = undefined, dropPosition = DropPosition.CENTER) {
+  // Only verifies drop on scrollbar tests if non-overlay scrollbar is present.
+  // Skips the test on platforms with overlay scrollbars.
+  if (dropPosition !== DropPosition.CENTER && calculateScrollbarThickness() <= 0) {
+    return;
+  }
+  promise_test((t) => new Promise(async (resolve, reject) => {
+    let dropEvent = false;
+
+    dropElement.addEventListener('drop', t.step_func((event) => {
+      dropEvent = true;
+      reject(new Error('Drop event should not have fired'));
+    }));
+
+    try {
+      var actions = new test_driver.Actions();
+      actions = movePointerToCenter(dragElement, dragIframe, actions)
+        .pointerDown();
+      actions = movePointerToPosition(dropElement, dropIframe, dropPosition, actions)
+        .pointerUp();
+      await actions.send();
+
+      if (!dropEvent) {
+        resolve();
+      }
+    } catch (e) {
+      reject(e);
+    }
+  }, testDescription));
+}
+
+const calculateScrollbarThickness = () => {
+    var container = document.createElement("div");
+    container.style.width = "100px";
+    container.style.height = "100px";
+    container.style.position = "absolute";
+    container.style.visibility = "hidden";
+    container.style.overflow = "auto";
+
+    document.body.appendChild(container);
+
+    var widthBefore = container.clientWidth;
+    var longContent = document.createElement("div");
+    longContent.style.height = "1000px";
+    container.appendChild(longContent);
+
+    var widthAfter = container.clientWidth;
+
+    container.remove();
+
+    return widthBefore - widthAfter;
+}
diff --git a/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-generated-content.html b/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-generated-content.html
index 25a36bc42cf..feb23d129ce 100644
--- a/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-generated-content.html
+++ b/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-generated-content.html
@@ -4,7 +4,7 @@
 <script src=/resources/testharnessreport.js></script>
 <link rel="stylesheet" href="/fonts/ahem.css">
 <style>
-body {
+.wrapper {
   /* Use Ahem to avoid fractional letter widths. */
   font: 20px/1 Ahem;
 }
@@ -18,8 +18,10 @@ fieldset {
 
 #test::before, #test::after { content:"X"; }
 </style>
-<fieldset id=test><legend>A</legend>Y</fieldset>
-<fieldset id=ref><legend>A</legend>XYX</fieldset>
+<div class="wrapper">
+  <fieldset id=test><legend>A</legend>Y</fieldset>
+  <fieldset id=ref><legend>A</legend>XYX</fieldset>
+</div>
 <script>
 test(() => {
   const testElm = document.querySelector('#test');
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_form_submission.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_form_submission.html
new file mode 100644
index 00000000000..986d0dcc7ef
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_form_submission.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<title>javascript: URL in form submission, initial src is not about:blank</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#process-the-iframe-attributes">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+setup({single_test: true});
+let iframeLoaded = false;
+window.javascriptUrlRan = false;
+</script>
+<iframe src="resources/javascript_url_form_submission.html" onload="iframeLoaded = true; this.onload = assert_unreached;"></iframe>
+<script>
+onload = () => {
+  const iframe = document.querySelector('iframe');
+  const btn = iframe.contentDocument.querySelector("button");
+  btn.onclick = (e) => {
+    const img = iframe.contentDocument.querySelector("img");
+    const newImg = iframe.contentDocument.createElement("img");
+    iframe.contentDocument.documentElement.appendChild(newImg);
+    newImg.src = img.src;
+  };
+
+  assert_true(iframeLoaded, "iframeLoaded");
+  btn.click();
+  assert_false(javascriptUrlRan, "javascriptUrlRan");
+  step_timeout(() => {
+    assert_true(javascriptUrlRan, "javascriptUrlRan");
+    done();
+  }, 100); // Verify only one load event is fired on iframe
+};
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html
new file mode 100644
index 00000000000..107862dd422
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_javascript_url_xhr.html
@@ -0,0 +1,84 @@
+<!DOCTYPE HTML>
+<title>javascript: URL triggers sync xhr</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#process-the-iframe-attributes">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+let iframeLoaded = false;
+</script>
+<iframe onload="iframeLoaded = true; this.onload = assert_unreached;"></iframe>
+<script>
+
+let javascriptUrlRan = false;
+window.javascriptURLXhr = function() {
+  // sychronous XHR
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', '/xhr/resources/delay.py?ms=2000', false);
+  xhr.send();
+
+  javascriptUrlRan = true;
+  setTimeout(() => {
+    parent.document.dispatchEvent(new Event("scriptExecuted"));
+  }, 0);
+};
+
+promise_test(async t => {
+  iframeLoaded = false;
+  javascriptUrlRan = false;
+
+  await new Promise(resolve => {
+    window.addEventListener("load", resolve, { once: true });
+  });
+
+  let scriptExecutePromise = new Promise(resolve => {
+    document.addEventListener("scriptExecuted", function() {
+      resolve();
+    }, { once: true });
+  });
+
+  assert_true(iframeLoaded, "iframeLoaded");
+  const iframe = document.querySelector('iframe');
+
+  // Load image on iframe.
+  let image = iframe.contentDocument.createElement("img");
+  image.src = "/images/blue.png";
+  iframe.contentDocument.body.appendChild(image);
+
+  // Javascript URL load on iframe.
+  iframe.src = "javascript:void(parent.javascriptURLXhr())";
+  assert_false(javascriptUrlRan, "javascriptUrlRan");
+  await scriptExecutePromise;
+  assert_true(javascriptUrlRan, "javascriptUrlRan");
+
+  // Verify only one load event is fired on iframe
+  await new Promise(resolve => step_timeout(() => resolve(), 100));
+}, "Image load should not trigger load event for non-initial javascript URL load");
+
+promise_test(async t => {
+  javascriptUrlRan = false;
+  const iframe = document.createElement("iframe");
+  iframe.src = "javascript:void(parent.javascriptURLXhr())";
+
+  let loadEventPromise = new Promise(resolve => {
+    iframe.onload = function() {
+      assert_true(javascriptUrlRan, "script should have ran");
+      this.onload = assert_unreached;
+      resolve();
+    };
+  });
+  document.body.appendChild(iframe);
+  assert_false(javascriptUrlRan, "javascriptUrlRan");
+
+  // Image load on iframe.
+  let image = iframe.contentDocument.createElement("img");
+  image.src = "/images/blue.png";
+  iframe.contentDocument.body.appendChild(image);
+
+  await loadEventPromise;
+
+  // Verify only one load event is fired on iframe
+  await new Promise(resolve => step_timeout(() => resolve(), 100));
+}, "Load event for initial javascript URL load should be fired after script execution");
+</script>
+</body>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation-manual.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation-manual.html
deleted file mode 100644
index 0fa9de7c125..00000000000
--- a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation-manual.html
+++ /dev/null
@@ -1,24 +0,0 @@
-<html>
-<head>
-    <style>
-        iframe { width: 400px; height: 300px;}
-    </style>
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <script>
-      setup({explicit_timeout: true});
-
-      async_test(function(t) {
-        window.addEventListener("message", t.step_func_done(function(e) {
-            assert_equals(e.data, "BLOCKED", "The message should say 'BLOCKED'.");
-          }));
-      }, "The sandboxed iframe should post a message saying the top navigation was blocked when no user gesture.");
-    </script>
-</head>
-<body>
-    <p>This tests that an iframe in sandbox with 'allow-top-navigation-by-user-activation'
-    can navigate the top level page, if it is trigged by a user gesture.</p>
-    <p>Click on the button in the iframe and it should navigate the top page.</p>
-    <iframe id="i" sandbox="allow-scripts allow-top-navigation-by-user-activation" src="support/iframe-that-performs-top-navigation.html"></iframe>
-</body>
-</html>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_with_user_gesture.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_with_user_gesture.html
new file mode 100644
index 00000000000..f22949eaaf9
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_with_user_gesture.html
@@ -0,0 +1,30 @@
+<!doctype html>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    let beforeunloadFired = false;
+
+    window.addEventListener(
+      "message",
+      t.step_func_done(function (e) {
+        assert_equals(e.data, "NAVIGATED", "The parent should be navigated");
+        assert_equals(
+          beforeunloadFired,
+          true,
+          "An beforeunload event should have been fired in the parent"
+        );
+      })
+    );
+
+    let parent = open(
+      "support/iframe-that-performs-top-navigation-parent-with-user-gesture-with-sandbox.sub.html"
+    );
+    parent.addEventListener("beforeunload", () => {
+      beforeunloadFired = true;
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_without_user_gesture.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_without_user_gesture.html
index 042851bbb49..989f505263b 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_without_user_gesture.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation_by_user_activation_without_user_gesture.html
@@ -1,19 +1,34 @@
 <!doctype html>
-<html>
-<head>
+
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
 <script>
-async_test(function(t) {
-  window.addEventListener("message", t.step_func_done(function(e) {
-      assert_equals(e.data, "PASS", "The message should say 'PASS' instead of 'FAIL'");
-    }));
-}, "The sandboxed iframe should post a message saying the test was in the state of 'PASS'.");
+  async_test(function (t) {
+    let beforeunloadFired = false;
+
+    window.addEventListener(
+      "message",
+      t.step_func_done(function (e) {
+        assert_equals(
+          e.data,
+          "ERROR",
+          "The child should receive an error when trying to navigate"
+        );
+        assert_equals(
+          beforeunloadFired,
+          false,
+          "No beforeunload event should have been fired in the parent"
+        );
+      })
+    );
+
+    let parent = open(
+      "support/iframe-that-performs-top-navigation-parent-with-sandbox.sub.html"
+    );
+    parent.addEventListener("beforeunload", () => {
+      beforeunloadFired = true;
+    });
+  });
 </script>
-</head>
-<body>
-    <p>This tests that an iframe in sandbox with 'allow-top-navigation-by-user-activation'
-    cannot navigate its top level page, if it is not trigged by a user gesture.</p>
-    <iframe sandbox='allow-top-navigation-by-user-activation allow-scripts' src="support/iframe-that-performs-top-navigation-without-user-gesture-failed.html"></iframe>
-</body>
-</html>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture.tentative.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture.tentative.html
new file mode 100644
index 00000000000..ff2fa4632a6
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture.tentative.html
@@ -0,0 +1,39 @@
+<!doctype html>
+
+Check that a cross-site iframe can navigate its top window if the user has
+interacted with it.
+
+<button>Gain user activation</button>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    // Gain user activation to be able to open a popup. This is needed, as we have
+    // enabled popup blocking for this test.
+    test_driver.click(document.querySelector("button")).then(() => {
+      let beforeunloadFired = false;
+
+      window.addEventListener(
+        "message",
+        t.step_func_done(function (e) {
+          assert_equals(e.data, "NAVIGATED", "The parent should be navigated");
+          assert_equals(
+            beforeunloadFired,
+            true,
+            "An beforeunload event should have been fired in the parent"
+          );
+        })
+      );
+
+      let parent = open(
+        "support/iframe-that-performs-top-navigation-parent-with-user-gesture.sub.html"
+      );
+      parent.addEventListener("beforeunload", () => {
+        beforeunloadFired = true;
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture_after_failure.tentative.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture_after_failure.tentative.html
new file mode 100644
index 00000000000..50b5c9f800d
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_with_user_gesture_after_failure.tentative.html
@@ -0,0 +1,61 @@
+<!doctype html>
+
+Check that a cross-site iframe can navigate its top window if the user has
+interacted with it, even if it was previously prevented from doing so because of
+a missing user activation.
+
+<button>Gain user activation</button>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    // Gain user activation to be able to open a popup. This is needed, as we have
+    // enabled popup blocking for this test.
+    test_driver.click(document.querySelector("button")).then(() => {
+      let beforeunloadFired = false;
+      let didReceiveFirstMessage = false;
+
+      window.addEventListener(
+        "message",
+        t.step_func(function (e) {
+          if (!didReceiveFirstMessage) {
+            assert_equals(
+              e.data,
+              "ERROR",
+              "On the first attempt, the child should receive an error when trying to navigate"
+            );
+            assert_equals(
+              beforeunloadFired,
+              false,
+              "On the first attempt, no beforeunload event should have been fired in the parent"
+            );
+            didReceiveFirstMessage = true;
+            return;
+          }
+
+          assert_equals(
+            e.data,
+            "NAVIGATED",
+            "On the second attempt, the parent should be navigated"
+          );
+          assert_equals(
+            beforeunloadFired,
+            true,
+            "On the second attempt, an beforeunload event should have been fired in the parent"
+          );
+          t.done();
+        })
+      );
+
+      let parent = open(
+        "support/iframe-that-performs-top-navigation-parent-with-user-gesture-after-failure.sub.html"
+      );
+      parent.addEventListener("beforeunload", () => {
+        beforeunloadFired = true;
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture.tentative.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture.tentative.html
new file mode 100644
index 00000000000..fd0a8471ecd
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture.tentative.html
@@ -0,0 +1,43 @@
+<!doctype html>
+
+Check that a cross-site iframe can't navigate its top window if the user hasn't
+interacted with it.
+
+<button>Gain user activation</button>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    // Gain user activation to be able to open a popup. This is needed, as we have
+    // enabled popup blocking for this test.
+    test_driver.click(document.querySelector("button")).then(() => {
+      let beforeunloadFired = false;
+
+      window.addEventListener(
+        "message",
+        t.step_func_done(function (e) {
+          assert_equals(
+            e.data,
+            "ERROR",
+            "The child should receive an error when trying to navigate"
+          );
+          assert_equals(
+            beforeunloadFired,
+            false,
+            "No beforeunload event should have been fired in the parent"
+          );
+        })
+      );
+
+      let parent = open(
+        "support/iframe-that-performs-top-navigation-parent.sub.html"
+      );
+      parent.addEventListener("beforeunload", () => {
+        beforeunloadFired = true;
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_nested_same_site.tentative.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_nested_same_site.tentative.html
new file mode 100644
index 00000000000..c31079a72e7
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_nested_same_site.tentative.html
@@ -0,0 +1,43 @@
+<!doctype html>
+
+Check that a cross-site iframe can't navigate its top window if the user hasn't
+interacted with it, even if its parent window is same-site.
+
+<button>Gain user activation</button>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    // Gain user activation to be able to open a popup. This is needed, as we have
+    // enabled popup blocking for this test.
+    test_driver.click(document.querySelector("button")).then(() => {
+      let beforeunloadFired = false;
+
+      window.addEventListener(
+        "message",
+        t.step_func_done(function (e) {
+          assert_equals(
+            e.data,
+            "ERROR",
+            "The child should receive an error when trying to navigate"
+          );
+          assert_equals(
+            beforeunloadFired,
+            false,
+            "No beforeunload event should have been fired in the parent"
+          );
+        })
+      );
+
+      let parent = open(
+        "support/iframe-that-performs-top-navigation-grandparent.sub.html"
+      );
+      parent.addEventListener("beforeunload", () => {
+        beforeunloadFired = true;
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_same_site.tentative.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_same_site.tentative.html
new file mode 100644
index 00000000000..bed2ee184ca
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe_top_navigation_without_user_gesture_same_site.tentative.html
@@ -0,0 +1,39 @@
+<!doctype html>
+
+Check that a same-site iframe can navigate its top window, even if the user
+hasn't interacted with it.
+
+<button>Gain user activation</button>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  async_test(function (t) {
+    // Gain user activation to be able to open a popup. This is needed, as we have
+    // enabled popup blocking for this test.
+    test_driver.click(document.querySelector("button")).then(() => {
+      let beforeunloadFired = false;
+
+      window.addEventListener(
+        "message",
+        t.step_func_done(function (e) {
+          assert_equals(e.data, "NAVIGATED", "The parent should be navigated");
+          assert_equals(
+            beforeunloadFired,
+            true,
+            "An  beforeunload event should have been fired in the parent"
+          );
+        })
+      );
+
+      let parent = open(
+        "support/iframe-that-performs-top-navigation-parent-same-site.html"
+      );
+      parent.addEventListener("beforeunload", () => {
+        beforeunloadFired = true;
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/resources/javascript_url_form_submission.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/resources/javascript_url_form_submission.html
new file mode 100644
index 00000000000..0d961babf0e
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/resources/javascript_url_form_submission.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<img src="/images/blue.png">
+<form action="javascript:(() => { parent.javascriptUrlRan = true; })()"><button>submit</button><form>
\ No newline at end of file
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture-after-failure.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture-after-failure.html
new file mode 100644
index 00000000000..bf9dd563409
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture-after-failure.html
@@ -0,0 +1,26 @@
+<!doctype html>
+
+<button>Gain user activation</button>
+
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  test_driver.set_test_context(top.opener);
+  window.onload = async function () {
+    try {
+      top.location = "navigation-changed-iframe.html";
+      return;
+    } catch (e) {
+      top.opener.postMessage("ERROR", "*");
+    }
+
+    const button = document.querySelector("button");
+    await test_driver.click(button);
+
+    try {
+      top.location = "navigation-changed-iframe.html";
+    } catch (e) {
+      top.opener.postMessage("ERROR", "*");
+    }
+  };
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture.html
new file mode 100644
index 00000000000..f7337b66e60
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture.html
@@ -0,0 +1,19 @@
+<!doctype html>
+
+<button>Gain user activation</button>
+
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  test_driver.set_test_context(top.opener);
+  window.onload = async function () {
+    const button = document.querySelector("button");
+    await test_driver.click(button);
+
+    try {
+      top.location = "navigation-changed-iframe.html";
+    } catch (e) {
+      top.opener.postMessage("ERROR", "*");
+    }
+  };
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child.html
new file mode 100644
index 00000000000..ffb3e4a0034
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child.html
@@ -0,0 +1,11 @@
+<!doctype html>
+
+<script>
+  window.onload = function () {
+    try {
+      top.location = "navigation-changed-iframe.html";
+    } catch (e) {
+      top.opener.postMessage("ERROR", "*");
+    }
+  };
+</script>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-grandparent.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-grandparent.sub.html
new file mode 100644
index 00000000000..1b1b49fd4d4
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-grandparent.sub.html
@@ -0,0 +1,5 @@
+<!doctype html>
+
+<iframe
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-same-site.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-same-site.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-same-site.html
new file mode 100644
index 00000000000..264269a3f58
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-same-site.html
@@ -0,0 +1,5 @@
+<!doctype html>
+
+<iframe
+  src="iframe-that-performs-top-navigation-child.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-sandbox.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-sandbox.sub.html
new file mode 100644
index 00000000000..915057725fe
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-sandbox.sub.html
@@ -0,0 +1,6 @@
+<!doctype html>
+
+<iframe
+  sandbox="allow-top-navigation-by-user-activation allow-scripts"
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-after-failure.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-after-failure.sub.html
new file mode 100644
index 00000000000..61b77aead1c
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-after-failure.sub.html
@@ -0,0 +1,5 @@
+<!doctype html>
+
+<iframe
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture-after-failure.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-with-sandbox.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-with-sandbox.sub.html
new file mode 100644
index 00000000000..89df4b70809
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture-with-sandbox.sub.html
@@ -0,0 +1,6 @@
+<!doctype html>
+
+<iframe
+  sandbox="allow-top-navigation-by-user-activation allow-scripts"
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture.sub.html
new file mode 100644
index 00000000000..9f9bcd91210
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent-with-user-gesture.sub.html
@@ -0,0 +1,5 @@
+<!doctype html>
+
+<iframe
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child-with-user-gesture.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent.sub.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent.sub.html
new file mode 100644
index 00000000000..f6ca250b862
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-parent.sub.html
@@ -0,0 +1,5 @@
+<!doctype html>
+
+<iframe
+  src="http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-child.html"
+></iframe>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-without-user-gesture-failed.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-without-user-gesture-failed.html
deleted file mode 100644
index 0436d56df97..00000000000
--- a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation-without-user-gesture-failed.html
+++ /dev/null
@@ -1,16 +0,0 @@
-<html>
-<body>
-The top navigation from this iframe should be blocked. This text should appear.
-<script>
-window.onload = function()
-{
-    try {
-        top.location = "navigation-changed-iframe.html";
-        top.postMessage("FAIL", "*");
-    } catch(e) {
-        top.postMessage("PASS", "*");
-    }
-}
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation.html
deleted file mode 100644
index c855ca3bab2..00000000000
--- a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/iframe-that-performs-top-navigation.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<html>
-<head>
-    <script>
-        function performTest()
-        {
-            try {
-                top.location = "navigation-changed-iframe.html";
-            } catch(e) {
-                top.postMessage("BLOCKED", "*");
-            }
-        }
-    </script>
-</head>
-<body onload="performTest();">
-    <p>This doc tried to navigate the top page when loaded, which should fail since it's not trigged by user activation while in a sandboxed frame with 'allow-top-navigtaion-by-user-activation'. <br> <br>
-    Click the button below, the top navigation should succeed with a new page saying "PASSED: Navigation succeeded." in browsers supporting the 'allow-top-navigtaion-by-user-activation' iframe@sandbox keyword (eg., Chrome v58+); Otherwise, the top navigation should fail.
-    </p>
-    <button id="b" onclick="performTest();">Navigate the top page</button>
-</body>
-</html>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/navigation-changed-iframe.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/navigation-changed-iframe.html
index abe0e78dfe4..0791dd12c2f 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/navigation-changed-iframe.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/support/navigation-changed-iframe.html
@@ -4,6 +4,7 @@
         function fireSentinel()
         {
             document.getElementsByTagName('h4')[0].innerHTML = document.domain;
+            opener.postMessage("NAVIGATED", "*");
         }
     </script>
 </head>
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/select-pseudo-light-dismiss-invalidation.tentative.html b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-pseudo-light-dismiss-invalidation.html
similarity index 82%
rename from tests/wpt/tests/html/semantics/forms/the-select-element/select-pseudo-light-dismiss-invalidation.tentative.html
rename to tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-pseudo-light-dismiss-invalidation.html
index 749fd8cf275..7c463a6a193 100644
--- a/tests/wpt/tests/html/semantics/forms/the-select-element/select-pseudo-light-dismiss-invalidation.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-pseudo-light-dismiss-invalidation.html
@@ -4,6 +4,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 
 <select id=select>
@@ -27,23 +28,31 @@ select, ::picker(select) {
 <button id=button>option</button>
 
 <script>
+function click(element) {
+  return (new test_driver.Actions()
+    .pointerMove(0, 0, {origin: element})
+    .pointerDown()
+    .pointerUp())
+    .send();
+}
+
 promise_test(async () => {
   assert_equals(getComputedStyle(select).backgroundColor, 'rgb(0, 255, 0)',
     'The select should match :not(:open) at the start of the test.');
 
-  await test_driver.click(select);
+  await click(select);
   assert_equals(getComputedStyle(select).backgroundColor, 'rgb(255, 0, 0)',
     'The select should match :open when opened.');
 
-  await test_driver.click(opttwo);
+  await click(opttwo);
   assert_equals(getComputedStyle(select).backgroundColor, 'rgb(0, 255, 0)',
     'The select should match :not(:open) after clicking an option.');
 
-  await test_driver.click(select);
+  await click(select);
   assert_equals(getComputedStyle(select).backgroundColor, 'rgb(255, 0, 0)',
     'The select should match :open when reopened.');
 
-  await test_driver.click(button);
+  await click(button);
   assert_equals(getComputedStyle(select).backgroundColor, 'rgb(0, 255, 0)',
     'The select should match :not(:open) after light dismiss.');
 }, 'select should not match :open when light dismissed.');
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/select-tabindex-order.tentative.html b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-tabindex-order.html
similarity index 91%
rename from tests/wpt/tests/html/semantics/forms/the-select-element/select-tabindex-order.tentative.html
rename to tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-tabindex-order.html
index 7cef337398a..0f6120e3684 100644
--- a/tests/wpt/tests/html/semantics/forms/the-select-element/select-tabindex-order.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/select-tabindex-order.html
@@ -5,13 +5,13 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 
-<input id="input1">
-<select id="select" tabindex="2">
+<input id="input1" tabindex="1">
+<select id="select" tabindex="3">
   <option>one</option>
   <option>two</option>
   <option>three</option>
 </select>
-<input id="input3" tabindex="1">
+<input id="input3" tabindex="2">
 
 <style>
   select, ::picker(select) {
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/switch-picker-appearance.html b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/switch-picker-appearance.html
index 6d768f4efd0..dd54d77d31e 100644
--- a/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/switch-picker-appearance.html
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/customizable-select/switch-picker-appearance.html
@@ -119,6 +119,8 @@ promise_test(async (t) => {
   assert_equals(getComputedStyle(select1,'::picker(select)').appearance,'none');
   await new Promise(requestAnimationFrame);
   await new Promise(requestAnimationFrame);
+  await new Promise(requestAnimationFrame);
+  await new Promise(requestAnimationFrame);
   assert_false(select1.matches(':open'),'changing appearance while the picker is open should close it');
 }, 'Switching appearance in JS after picker is open should close the picker');
 </script>
@@ -151,10 +153,10 @@ promise_test(async (t) => {
   assert_false(select2.matches(':open'),'setup');
   assert_equals(select2.value,'option one');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_true(select2.matches(':open'),'picker should open when clicked');
   assert_equals(secondOption.textContent,'option two');
-  await test_driver.click(secondOption);
+  await clickOn(secondOption);
   assert_false(select2.matches(':open'));
   assert_equals(select2.value,'option two');
 },'Test of the test harness');
@@ -163,16 +165,16 @@ promise_test(async (t) => {
   assert_false(select2.matches(':open'),'setup');
   assert_equals(select2.className,'');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_true(select2.matches(':open'),'picker should open when clicked');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(secondOption); // Choose an option
+  await clickOn(secondOption); // Choose an option
   assert_false(select2.matches(':open'));
   t.add_cleanup(() => select2.removeAttribute('class'));
   select2.classList.add('controlswitch');
   assert_false(select2.matches(':open'));
   assert_equals(getComputedStyle(select2).appearance,'base-select','appearance should not have changed yet');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_false(select2.matches(':open'),'picker should get closed when the appearance value changes');
   assert_equals(getComputedStyle(select2).appearance,'base-select','appearance should be back to base-select');
 },'The select picker is closed if the <select> appearance value is changed via CSS while the picker is open');
@@ -181,14 +183,14 @@ promise_test(async (t) => {
   assert_false(select2.matches(':open'),'setup');
   assert_equals(select2.className,'');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_true(select2.matches(':open'),'picker should open when clicked');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(secondOption); // Choose an option
+  await clickOn(secondOption); // Choose an option
   assert_false(select2.matches(':open'));
   t.add_cleanup(() => select2.removeAttribute('class'));
   select2.classList.add('pickerswitch');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_false(select2.matches(':open'),'picker should get closed when the appearance value changes');
   assert_equals(getComputedStyle(select2).appearance,'base-select','appearance should be back to base-select');
 },'The select picker is closed if the ::picker() appearance value is changed via CSS while the picker is open');
@@ -197,7 +199,7 @@ promise_test(async (t) => {
   assert_false(select2.matches(':open'),'setup');
   assert_equals(select2.className,'');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
-  await test_driver.click(select2);
+  await clickOn(select2);
   assert_true(select2.matches(':open'),'picker should open when clicked');
   assert_equals(getComputedStyle(select2).appearance,'base-select');
   t.add_cleanup(() => select2.removeAttribute('style'));
diff --git a/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/support/simple-style.css b/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/support/simple-style.css
new file mode 100644
index 00000000000..069da9df6c6
--- /dev/null
+++ b/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/support/simple-style.css
@@ -0,0 +1 @@
+:root { z-index: 3 }
diff --git a/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml b/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml
new file mode 100644
index 00000000000..2242703c1d0
--- /dev/null
+++ b/tests/wpt/tests/html/the-xhtml-syntax/parsing-xhtml-documents/xml-stylesheet-blocking.xhtml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet type="text/css" href="support/simple-style.css?pipe=trickle(d2)"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <script><![CDATA[
+      window.observedZIndex = getComputedStyle(document.documentElement).zIndex;
+    ]]></script>
+    <title>xml-stylesheet blocks script execution and rendering</title>
+    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1986042" />
+    <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io" />
+    <link rel="author" title="Mozilla" href="https://mozilla.org" />
+    <script src="/resources/testharness.js"/>
+    <script src="/resources/testharnessreport.js"/>
+  </head>
+  <body>
+    <script><![CDATA[
+    test(function() {
+      assert_equals(window.observedZIndex, "3", "XML processing instruction should've blocked script execution and rendering");
+    });
+    ]]></script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/interfaces/mediaqueries-5.idl b/tests/wpt/tests/interfaces/mediaqueries-5.idl
index c951c356ca3..a32d2d40f3e 100644
--- a/tests/wpt/tests/interfaces/mediaqueries-5.idl
+++ b/tests/wpt/tests/interfaces/mediaqueries-5.idl
@@ -7,8 +7,8 @@ typedef (MediaList or boolean) CustomMediaQuery;
 
 [Exposed=Window]
 interface CSSCustomMediaRule : CSSRule {
-    readonly attribute CSSOMString name;
-    readonly attribute CustomMediaQuery query;
+  readonly attribute CSSOMString name;
+  readonly attribute CustomMediaQuery query;
 };
 
 [Exposed=Window, SecureContext]
diff --git a/tests/wpt/tests/interfaces/web-animations-2.idl b/tests/wpt/tests/interfaces/web-animations-2.idl
index af9f16bef35..f18cdd4f458 100644
--- a/tests/wpt/tests/interfaces/web-animations-2.idl
+++ b/tests/wpt/tests/interfaces/web-animations-2.idl
@@ -134,17 +134,4 @@ dictionary AnimationTriggerOptions {
   (TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) exitRangeEnd = "auto";
 };
 
-[Exposed=Window]
-interface EventTrigger : AnimationTrigger {
-  constructor(optional EventTriggerOptions options = {});
-  readonly attribute DOMString eventType;
-  readonly attribute EventTarget eventTarget;
-};
-
-dictionary EventTriggerOptions {
-  AnimationTriggerBehavior? behavior = "once";
-  DOMString eventType;
-  EventTarget eventTarget;
-};
-
 enum AnimationTriggerBehavior { "once", "repeat", "alternate", "state" };
diff --git a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
index c982e7fc3c5..8fa55d3cb55 100644
--- a/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
+++ b/tests/wpt/tests/interfaces/webrtc-encoded-transform.idl
@@ -137,7 +137,7 @@ partial interface DedicatedWorkerGlobalScope {
 interface RTCRtpScriptTransformer : EventTarget {
     // Attributes and methods related to the transformer source
     readonly attribute ReadableStream readable;
-    Promise<unsigned long long> generateKeyFrame(optional DOMString rid);
+    Promise<undefined> generateKeyFrame(optional DOMString rid);
     Promise<undefined> sendKeyFrameRequest();
     // Attributes and methods related to the transformer sink
     readonly attribute WritableStream writable;
diff --git a/tests/wpt/tests/is-input-pending/WEB_FEATURES.yml b/tests/wpt/tests/is-input-pending/WEB_FEATURES.yml
new file mode 100644
index 00000000000..ce7b9db96e3
--- /dev/null
+++ b/tests/wpt/tests/is-input-pending/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: is-input-pending
+  files: "**"
diff --git a/tests/wpt/tests/keyboard-lock/WEB_FEATURES.yml b/tests/wpt/tests/keyboard-lock/WEB_FEATURES.yml
new file mode 100644
index 00000000000..bb30e32dd61
--- /dev/null
+++ b/tests/wpt/tests/keyboard-lock/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: keyboard-lock
+  files: "**"
diff --git a/tests/wpt/tests/keyboard-map/WEB_FEATURES.yml b/tests/wpt/tests/keyboard-map/WEB_FEATURES.yml
new file mode 100644
index 00000000000..8775ff2e185
--- /dev/null
+++ b/tests/wpt/tests/keyboard-map/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: keyboard-map
+  files: "**"
diff --git a/tests/wpt/tests/largest-contentful-paint/resized-image-not-reconsidered.html b/tests/wpt/tests/largest-contentful-paint/resized-image-not-reconsidered.html
index 6e195b89f9e..5d43cafdf1f 100644
--- a/tests/wpt/tests/largest-contentful-paint/resized-image-not-reconsidered.html
+++ b/tests/wpt/tests/largest-contentful-paint/resized-image-not-reconsidered.html
@@ -1,45 +1,48 @@
-<!DOCTYPE HTML>
-<meta charset=utf-8>
+<!doctype html>
+<meta charset="utf-8" />
 <title>Resized Image Is Not Reconsidered as LCP.</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
 <body>
-  <img src='/images/lcp-256x256.png' id='image_id' height="100" width="50" />
+  <img src="/images/lcp-256x256.png" id="testpic" height="100" width="50" />
   <script>
-    let image_id = 'image_id';
-
-    // Create a promise that resolves when an LCP is observed.
-    const lcp_observation_promise = image_src => {
-      return new Promise(resolve => {
-        new PerformanceObserver((entryList) => {
-          let lcpEntries = entryList.getEntries().filter(e => e.id == image_id);
-
-          if (lcpEntries) {
-            resolve(lcpEntries);
-          }
-        }).observe({ type: 'largest-contentful-paint', buffered: true });
+    promise_test(async (t) => {
+      // Set up an observer that looks for LCP entries for the testpic,
+      // identified by its id.
+      const entries = [];
+      const observer = new PerformanceObserver((l) => {
+        entries.push(...l.getEntries().filter((e) => e.id == "testpic"));
       });
-    }
+      observer.observe({ type: "largest-contentful-paint", buffered: true });
 
-    promise_test(async t => {
-      const lcpEntriesInitial = await lcp_observation_promise();
-      assert_equals(lcpEntriesInitial.length, 1);
+      // Wait for the initial LCP entry to be emitted, and verify it's as expected.
+      await t.step_wait(() => entries.length > 0, "Waiting for initial LCP entry to be emitted.");
+      assert_equals(entries.length, 1);
+      assert_equals(entries[0].id, "testpic");
+      assert_equals(entries[0].size, 100 * 50);
 
-      // Resize image.
-      document.getElementById('image_id').height = 150;
+      // Now resize image, then wait, then observe that no additional
+      // entries are emitted.
+      document.getElementById("testpic").height = 150;
 
-      // Wait for a repaint.
-      const lcpEntriesAfterImageResizing =
-        await new Promise(resolve => {
-          t.step_timeout(window.requestAnimationFrame(async () => {
-            resolve(await lcp_observation_promise());
-          }), 100);
+      // Wait for the image to be resized - after a requestAnimationFrame
+      // cycle and 1 second, disconnect the observer.
+      await new Promise((resolve) => {
+        requestAnimationFrame(() => {
+          t.step_timeout(() => {
+            observer.disconnect();
+            resolve();
+          }, 1000);
         });
+      });
 
-      // No additional LCP entry is emitted after the image is resized to be larger.
-      assert_equals(lcpEntriesAfterImageResizing.length, 1);
-      assert_true(lcpEntriesInitial[0] === lcpEntriesAfterImageResizing[0]);
+      // Verify that the image was not reconsidered as LCP: it's still
+      // the same entry, reflecting the initial size with width and height from
+      // the img tag.
+      assert_equals(entries.length, 1);
+      assert_equals(entries[0].id, "testpic");
+      assert_equals(entries[0].size, 100 * 50);
     }, "Resized image should not be reconsidered as LCP");
   </script>
-</body>
\ No newline at end of file
+</body>
diff --git a/tests/wpt/tests/navigation-api/navigate-event/intercept-handler-throws.html b/tests/wpt/tests/navigation-api/navigate-event/intercept-handler-throws.html
index 769f6759997..9bebfdaab84 100644
--- a/tests/wpt/tests/navigation-api/navigate-event/intercept-handler-throws.html
+++ b/tests/wpt/tests/navigation-api/navigate-event/intercept-handler-throws.html
@@ -11,7 +11,7 @@ async_test(t => {
     assert_equals(location.hash, "#1");
     assert_equals(e.constructor, ErrorEvent);
     assert_true(e.error === err);
-    assert_equals(e.message, "Uncaught TypeError: a message");
+    assert_true(e.message.includes("TypeError: a message"));
     assert_equals(e.filename, start_href);
     assert_greater_than(e.colno, 0);
     assert_greater_than(e.lineno, 0);
diff --git a/tests/wpt/tests/navigation-api/navigate-event/intercept-multiple-times-reject.html b/tests/wpt/tests/navigation-api/navigate-event/intercept-multiple-times-reject.html
index 0b0f1f0b8e8..50d4c441333 100644
--- a/tests/wpt/tests/navigation-api/navigate-event/intercept-multiple-times-reject.html
+++ b/tests/wpt/tests/navigation-api/navigate-event/intercept-multiple-times-reject.html
@@ -14,7 +14,7 @@ promise_test(async t => {
     assert_equals(location.hash, "#1");
     assert_equals(e.constructor, ErrorEvent);
     assert_equals(e.error, err);
-    assert_equals(e.message, "Uncaught TypeError: a message");
+    assert_true(e.message.includes("TypeError: a message"));
     assert_equals(e.filename, start_href);
     assert_greater_than(e.colno, 0);
     assert_greater_than(e.lineno, 0);
diff --git a/tests/wpt/tests/navigation-api/navigate-event/intercept-reject.html b/tests/wpt/tests/navigation-api/navigate-event/intercept-reject.html
index 4c5ec0163d1..ecf0c0f137d 100644
--- a/tests/wpt/tests/navigation-api/navigate-event/intercept-reject.html
+++ b/tests/wpt/tests/navigation-api/navigate-event/intercept-reject.html
@@ -11,7 +11,7 @@ async_test(t => {
     assert_equals(location.hash, "#1");
     assert_equals(e.constructor, ErrorEvent);
     assert_true(e.error === err);
-    assert_equals(e.message, "Uncaught TypeError: a message");
+    assert_true(e.message.includes("TypeError: a message"));
     assert_equals(e.filename, start_href);
     assert_greater_than(e.colno, 0);
     assert_greater_than(e.lineno, 0);
diff --git a/tests/wpt/tests/periodic-background-sync/WEB_FEATURES.yml b/tests/wpt/tests/periodic-background-sync/WEB_FEATURES.yml
new file mode 100644
index 00000000000..b87ab6206f0
--- /dev/null
+++ b/tests/wpt/tests/periodic-background-sync/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: periodic-background-sync
+  files: "**"
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
index eb405d26c33..a3ebfacd062 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
@@ -1,79 +1,63 @@
 <!doctype html>
-<html>
-    <head>
-        <title>pointerrawupdate</title>
-        <meta name="viewport" content="width=device-width">
-        <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
-        <script src="/resources/testharness.js"></script>
-        <script src="/resources/testharnessreport.js"></script>
-        <script src="/resources/testdriver.js"></script>
-        <script src="/resources/testdriver-actions.js"></script>
-        <script src="/resources/testdriver-vendor.js"></script>
-        <!-- Additional helper script for common checks across event types -->
-        <script type="text/javascript" src="pointerevent_support.js"></script>
-    </head>
-    <body onload="run()">
-        <h2>pointerrawupdate</h2>
-        <h4>Test Description: This test checks that pointerrawupdate is not dispatched on non-SecureContext. </h4>
-        <p>Move your mouse within the black box.</p>
-        <p>Press left button down and then press middle button while holding down left button. Then release the buttons</p>
-        <div id="target0"></div>
-        <script>
-            var test_pointerrawupdate = async_test("pointerrawupdate event not received");
-            var actions_promise;
+<title>No pointerrawupdate in non-secure contexts</title>
+<link rel="help"
+  href="https://w3c.github.io/pointerevents/#the-pointerrawupdate-event">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script type="text/javascript" src="pointerevent_support.js"></script>
+<style>
+  #target {
+    width: 50px;
+    height: 50px;
+  }
+</style>
+<div id="target"></div>
+<script>
+  "use strict";
 
-            var pointerrawupdateReceived = false;
-            var pointerdownReceived = false;
-            var pointerrawupdateFromButtonChangeReceived = false;
+  let event_log = [];
+  const eventLogger = e => event_log.push(e.type);
 
-            function run() {
-                var target0 = document.getElementById("target0");
+  const target = document.getElementById("target");
+  ["pointerrawupdate", "pointerdown", "pointermove", "pointerup"].forEach(
+      ename => target.addEventListener(ename, eventLogger));
 
-                on_event(target0, "pointerrawupdate", function (event) {
-                    pointerrawupdateReceived = true;
-                    if (pointerdownReceived && event.button != -1)
-                      pointerrawupdateFromButtonChangeReceived = true;
-                });
-                on_event(target0, "pointermove", function (event) {
-                    test_pointerrawupdate.step(function() {
-                        assert_false(pointerrawupdateReceived,
-                                    "Pointerrawupdate event should not have been received before pointermove.");
-                        }, "Pointerrawupdate event should have been received before pointermove.");
-                });
-                on_event(target0, "pointerdown", function (event) {
-                    pointerdownReceived = true;
-                });
-                on_event(target0, "pointerup", function (event) {
-                    test_pointerrawupdate.step(function() {
-                        assert_false(pointerrawupdateFromButtonChangeReceived,
-                                    "Pointerrawupdate event should not have been received from chorded button changes.");
-                        }, "Pointerrawupdate event should have been received from chorded button changes.");
+  promise_test(async test => {
+    let pointerup_promise = getEvent("pointerup", target, test);
 
-                    test_pointerrawupdate.step(function() {
-                        assert_false("onpointerrawupdate" in window,
-                                    "Window should not have event handler onpointerrawupdate");
-                        assert_false("onpointerrawupdate" in window.document,
-                                    "Document should not have event handler onpointerrawupdate");
-                        assert_false("onpointerrawupdate" in window.document.documentElement,
-                                     "Element should not have event handler onpointerrawupdate");
-                        }, "onpointerrawupdate should be exposed only in SecureContext");
+    var actions = new test_driver.Actions();
+    actions = actions.pointerMove(0, 0, {origin: target})
+        .pointerDown({button: actions.ButtonType.LEFT})
+        .pointerDown({button: actions.ButtonType.MIDDLE})
+        .pointerUp({button: actions.ButtonType.MIDDLE})
+        .pointerUp({button: actions.ButtonType.LEFT});
 
-                    // Make sure the test finishes after all the input actions are completed.
-                    actions_promise.then( () => {
-                        test_pointerrawupdate.done();
-                    });
-                });
-                var actions = new test_driver.Actions();
-                actions_promise = actions.pointerMove(0, 0, {origin: target0, button: actions.ButtonType.LEFT})
-                    .pointerDown({button: actions.ButtonType.LEFT})
-                    .pointerDown({button: actions.ButtonType.MIDDLE})
-                    .pointerUp({button: actions.ButtonType.MIDDLE})
-                    .pointerUp({button: actions.ButtonType.LEFT})
-                    .send();
-            }
+    await actions.send();
+    await pointerup_promise;
 
-        </script>
-        <div id="complete-notice">
-        </div>
-    </body>
-</html>
+    // Main assertion for this test.  Note that secure contexts are covered in
+    // pointerevent_pointerrawupdate.https.html.
+    assert_false(event_log.includes("pointerrawupdate"),
+        "pointerrawupdate received");
+
+    // A sanity check that other events are fired correctly.  Note that chorded
+    // buttons fire pointermoves.
+    const expected_events = [
+      "pointermove", "pointerdown", "pointermove", "pointermove", "pointerup"
+    ];
+    assert_equals(event_log.toString(), expected_events.toString(),
+        "events received");
+  }, "pointerrawupdate event is not fired");
+
+  promise_test(async test => {
+    assert_false("onpointerrawupdate" in window,
+        "Window should not have event handler onpointerrawupdate");
+    assert_false("onpointerrawupdate" in window.document,
+        "Document should not have event handler onpointerrawupdate");
+    assert_false("onpointerrawupdate" in window.document.documentElement,
+        "Element should not have event handler onpointerrawupdate");
+  }, "onpointerrawupdate is not exposed");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
index 74c14d932ff..85df262e778 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
@@ -1,69 +1,65 @@
 <!doctype html>
-<html>
-    <head>
-        <title>pointerrawupdate</title>
-        <meta name="viewport" content="width=device-width">
-        <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
-        <script src="/resources/testharness.js"></script>
-        <script src="/resources/testharnessreport.js"></script>
-        <script src="/resources/testdriver.js"></script>
-        <script src="/resources/testdriver-actions.js"></script>
-        <script src="/resources/testdriver-vendor.js"></script>
-        <!-- Additional helper script for common checks across event types -->
-        <script type="text/javascript" src="pointerevent_support.js"></script>
-    </head>
-    <body onload="run()">
-        <h2>pointerrawupdate</h2>
-        <h4>Test Description: This test checks if pointerrawupdate is dispatched correctly. </h4>
-        <p>Move your mouse within the black box.</p>
-        <p>Press left button down and then press middle button while holding down left button. Then release the buttons</p>
-        <div id="target0"></div>
-        <script>
-            var test_pointerrawupdate = async_test("pointerrawupdate event received");
-            var actions_promise;
+<title>Firing of pointerrawupdate in secure contexts</title>
+<link rel="help"
+  href="https://w3c.github.io/pointerevents/#the-pointerrawupdate-event">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script type="text/javascript" src="pointerevent_support.js"></script>
+<style>
+  #target {
+    width: 50px;
+    height: 50px;
+  }
+</style>
+<div id="target"></div>
+<script>
+  "use strict";
 
-            var pointerrawupdateReceived = false;
-            var pointerdownReceived = false;
-            var pointerrawupdateFromButtonChangeReceived = false;
+  let event_log = [];
+  const eventLogger = e => event_log.push(e.type);
 
-            function run() {
-                var target0 = document.getElementById("target0");
+  const target = document.getElementById("target");
+  ["pointerrawupdate", "pointerdown", "pointermove", "pointerup"].forEach(
+      ename => target.addEventListener(ename, eventLogger));
 
-                on_event(target0, "pointerrawupdate", function (event) {
-                    pointerrawupdateReceived = true;
-                    if (pointerdownReceived && event.button != -1)
-                      pointerrawupdateFromButtonChangeReceived = true;
-                });
-                on_event(target0, "pointermove", function (event) {
-                    test_pointerrawupdate.step(function() {
-                        assert_true(pointerrawupdateReceived,
-                                    "Pointerrawupdate event should have been received before pointermove.");
-                        }, "Pointerrawupdate event should have been received before pointermove.");
-                });
-                on_event(target0, "pointerdown", function (event) {
-                    pointerdownReceived = true;
-                });
-                on_event(target0, "pointerup", function (event) {
-                    test_pointerrawupdate.step(function() {
-                        assert_true(pointerrawupdateFromButtonChangeReceived,
-                                    "Pointerrawupdate event should have been received from chorded button changes.");
-                        }, "Pointerrawupdate event should have been received from chorded button changes.");
-                    // Make sure the test finishes after all the input actions are completed.
-                    actions_promise.then( () => {
-                        test_pointerrawupdate.done();
-                    });
-                });
-                var actions = new test_driver.Actions();
-                actions_promise = actions.pointerMove(0, 0, {origin: target0, button: actions.ButtonType.LEFT})
-                    .pointerDown({button: actions.ButtonType.LEFT})
-                    .pointerDown({button: actions.ButtonType.MIDDLE})
-                    .pointerUp({button: actions.ButtonType.MIDDLE})
-                    .pointerUp({button: actions.ButtonType.LEFT})
-                    .send();
-            }
+  promise_test(async test => {
+    let pointerup_promise = getEvent("pointerup", target, test);
 
-        </script>
-        <div id="complete-notice">
-        </div>
-    </body>
-</html>
+    var actions = new test_driver.Actions();
+    actions = actions.pointerMove(0, 0, {origin: target})
+        .pointerDown({button: actions.ButtonType.LEFT})
+        .pointerDown({button: actions.ButtonType.MIDDLE})
+        .pointerUp({button: actions.ButtonType.MIDDLE})
+        .pointerUp({button: actions.ButtonType.LEFT});
+
+    await actions.send();
+    await pointerup_promise;
+
+    // Main assertion for this test. Note that non-secure contexts are covered
+    // in pointerevent_pointerrawupdate.html.
+    assert_true(event_log.includes("pointerrawupdate"),
+        "pointerrawupdate received");
+
+    // Assert the order of pointerrawupdate with respect to other events. Note
+    // that chorded buttons fire pointermoves.
+    const expected_events = [
+      "pointerrawupdate", "pointermove", "pointerdown",
+      "pointerrawupdate", "pointermove", "pointerrawupdate", "pointermove",
+      "pointerup"
+    ];
+    assert_equals(event_log.toString(), expected_events.toString(),
+        "events received");
+  }, "pointerrawupdate event is fired");
+
+  promise_test(async test => {
+    assert_true("onpointerrawupdate" in window,
+        "Window should have event handler onpointerrawupdate");
+    assert_true("onpointerrawupdate" in window.document,
+        "Document should have event handler onpointerrawupdate");
+    assert_true("onpointerrawupdate" in window.document.documentElement,
+        "Element should have event handler onpointerrawupdate");
+  }, "onpointerrawupdate is exposed");
+</script>
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-addAnimation.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-addAnimation.tentative.html
index a30e68a672d..721a2a5e3a1 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-addAnimation.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-addAnimation.tentative.html
@@ -79,7 +79,8 @@
 
         // As the default trigger is always  in the tripped state, the animation
         // should be played right away.
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "enter", "play-forwards");
+        trigger.addAnimation(animation, "exit", "play-backwards");
         await animation.finished;
 
         assert_times_equal(animation.currentTime, ANIMATION_DURATION_MS,
@@ -98,7 +99,8 @@
         assert_equals(scroller.scrollTop, 0, "scroller is not scrolled, i.e. " +
           "not within the trigger range");
 
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "enter", "play-forwards");
+        trigger.addAnimation(animation, "exit", "play-backwards");
 
         await waitForAnimationFrames(2);
 
@@ -134,7 +136,8 @@
         assert_equals(animation.playState, "idle", "animation is still idle");
         assert_equals(animation.currentTime, null, "currentTime is still null");
 
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "enter", "play-forwards");
+        trigger.addAnimation(animation, "exit", "play-backwards");
         await animation.finished;
 
         assert_equals(animation.playState, "finished",
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-disarmed-by-apis.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-disarmed-by-apis.tentative.html
index ab13b0069aa..5ca46f8870d 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-disarmed-by-apis.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-disarmed-by-apis.tentative.html
@@ -110,7 +110,8 @@
         assert_equals(animation.playState, "idle", "animation is idle.");
         // Attaching the trigger should simply keep the animaiton paused at
         // zero currentTime.
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "enter", "play-forwards");
+        trigger.addAnimation(animation, "exit", "play-backwards");
         await waitForNextFrame();
         assert_times_equal(animation.currentTime, 0,
             "animation is paused at currentTime zero.");
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-animations.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-animations.tentative.html
index 962bbe3bdea..95ecce479e8 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-animations.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-animations.tentative.html
@@ -92,7 +92,8 @@
         assert_equals(scroller.scrollTop, 0,
           "scroller is not scrolled, i.e. not within the trigger range");
 
-        trigger.addAnimation(animation1);
+        trigger.addAnimation(animation1, "enter", "play-forwards");
+        trigger.addAnimation(animation1, "exit", "play-backwards");
 
         assert_equals(animation1.playState, "paused",
           "animation1 is paused, awaiting trigger event");
@@ -102,7 +103,8 @@
         assert_equals(animation2.currentTime, null,
           "animations2's currentTime is null");
 
-        trigger.addAnimation(animation2);
+        trigger.addAnimation(animation2, "enter", "play-forwards");
+        trigger.addAnimation(animation2, "exit", "play-backwards");
 
         assert_equals(animation1.playState, "paused",
           "animation is paused, awaiting trigger event");
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-triggers.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-triggers.tentative.html
index b43744f7fb1..fa493f178df 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-triggers.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-multiple-triggers.tentative.html
@@ -97,12 +97,14 @@
         assert_equals(scroller.scrollTop, 0, "scroller is not scrolled, i.e. " +
           "not within the trigger range");
 
-        trigger1.addAnimation(animation);
-        trigger2.addAnimation(animation);
+        trigger1.addAnimation(animation, "enter", "play-forwards");
+        trigger1.addAnimation(animation, "exit", "reset");
+        trigger2.addAnimation(animation, "enter", "play-forwards");
+        trigger2.addAnimation(animation, "exit", "reset");
 
         // Test preconditions.
         assert_equals(animation.playState, "paused", "animation is idle");
-        assert_equals(animation.currentTime, 0, "currentTime is null");
+        assert_equals(animation.currentTime, 0, "currentTime is 0");
 
         await rangeBoundaries1.enterTriggerRange();
         await animation.finished;
@@ -145,8 +147,10 @@
         assert_equals(scroller.scrollTop, 0, "scroller is not scrolled, i.e. " +
           "not within the trigger range");
 
-        trigger1.addAnimation(animation);
-        trigger2.addAnimation(animation);
+        trigger1.addAnimation(animation, "enter", "play-forwards");
+        trigger1.addAnimation(animation, "exit", "reset");
+        trigger2.addAnimation(animation, "enter", "play-forwards");
+        trigger2.addAnimation(animation, "exit", "reset");
 
         // Test preconditions.
         assert_equals(animation.playState, "paused", "animation is paused");
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-state.tentative.html b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-state.tentative.html
index 1a80e6dadab..7673a4ca858 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-state.tentative.html
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/animation-trigger-state.tentative.html
@@ -24,15 +24,15 @@
       }
 
       #scroll_target {
-        animation-trigger: trigger(--scrolltrigger, enter play, exit pause);
+        animation-trigger: trigger(--scrolltrigger, enter play-once, exit pause);
         timeline-trigger: --scrolltrigger scroll() state 150px 200px;
       }
       #view_target {
-        animation-trigger: trigger(--viewtrigger, enter play, exit pause);
+        animation-trigger: trigger(--viewtrigger, enter play-once, exit pause);
         timeline-trigger: --viewtrigger view() state 150px 200px;
       }
       #deferred_target {
-        animation-trigger: trigger(--deferredtrigger, enter play, exit pause);
+        animation-trigger: trigger(--deferredtrigger, enter play-once, exit pause);
       }
       #deferred_subject {
         view-timeline: --viewtimeline;
diff --git a/tests/wpt/tests/scroll-animations/animation-trigger/support/support.js b/tests/wpt/tests/scroll-animations/animation-trigger/support/support.js
index ad67e610db8..6b4bb65b130 100644
--- a/tests/wpt/tests/scroll-animations/animation-trigger/support/support.js
+++ b/tests/wpt/tests/scroll-animations/animation-trigger/support/support.js
@@ -111,7 +111,8 @@ function setupAnimationAndTrigger(target, subject, duration) {
     rangeEnd: "contain 100%"
   });
 
-  trigger.addAnimation(animation);
+  trigger.addAnimation(animation, "enter", "play-forwards");
+  trigger.addAnimation(animation, "exit", "play-backwards");
 }
 
 async function waitForAnimation(targetCurrentTime, animation) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text-once-per-interaction.html b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text-once-per-interaction.html
index 41a363888fc..c5b2ba26d70 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text-once-per-interaction.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text-once-per-interaction.html
@@ -33,11 +33,9 @@
 
     const softNavPromise = SoftNavigationTestHelper.getPerformanceEntries(
         "soft-navigation",
-        /* includeSoftNavigationObservations= */true,
         /* minNumEntries= */ 1);
     let icpPromise = SoftNavigationTestHelper.getPerformanceEntries(
         "interaction-contentful-paint",
-        /* includeSoftNavigationObservations= */true,
         /* minNumEntries= */ 1);
     const {promise, resolve} = Promise.withResolvers();
 
@@ -81,7 +79,6 @@
     // Set things up for the next ICP entry.
     icpPromise = SoftNavigationTestHelper.getPerformanceEntries(
         "interaction-contentful-paint",
-        /* includeSoftNavigationObservations= */true,
         /* minNumEntries= */ 1);
     resolve();
 
diff --git a/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text.html b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text.html
index 653ae6848ec..72dced51c80 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/detection/tentative/overwriting-text.html
@@ -47,11 +47,9 @@
         waitForExactlyOneElementTimingEntry(url, /*buffered=*/false);
     const softNavPromise = SoftNavigationTestHelper.getPerformanceEntries(
         "soft-navigation",
-        /* includeSoftNavigationObservations= */true,
         /* minNumEntries= */ 1);
     const icpPromise = SoftNavigationTestHelper.getPerformanceEntries(
         "interaction-contentful-paint",
-        /* includeSoftNavigationObservations= */true,
         /* minNumEntries= */ 1);
 
     if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-image.window.js b/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-image.window.js
index 96255d82f2d..b73e801d6db 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-image.window.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-image.window.js
@@ -42,7 +42,6 @@ promise_test(async (t) => {
   const helper = new SoftNavigationTestHelper(t);
   const entries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ 'soft-navigation',
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
       /*timeout=*/ 3000
   );
diff --git a/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-text.window.js b/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-text.window.js
index 341b5aaed74..967563a2aa9 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-text.window.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/dom/tentative/distant-leaf-text.window.js
@@ -38,7 +38,6 @@ promise_test(async (t) => {
   const helper = new SoftNavigationTestHelper(t);
   const entries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ 'soft-navigation',
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
       /*timeout=*/ 3000
     );
diff --git a/tests/wpt/tests/soft-navigation-heuristics/interaction-with-paint-before-back.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/interaction-with-paint-before-back.tentative.html
index f1356399f02..27a8cd98198 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/interaction-with-paint-before-back.tentative.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/interaction-with-paint-before-back.tentative.html
@@ -58,7 +58,6 @@
           {
             const element_timing_promise = helper.getBufferedPerformanceEntriesWithTimeout(
               /*type=*/ "element",
-              /*includeSoftNavigationObservations=*/ false,
               /*minNumEntries=*/ 1,
             );
             if (test_driver) {
@@ -80,7 +79,6 @@
           {
             const soft_nav_promise = helper.getBufferedPerformanceEntriesWithTimeout(
               /*type=*/ "soft-navigation",
-              /*includeSoftNavigationObservations=*/ false,
               /*minNumEntries=*/ 1,
             );
             if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/background-image-set-image.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/background-image-set-image.html
index 78a41dbc776..d72031d70de 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/background-image-set-image.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/background-image-set-image.html
@@ -38,7 +38,6 @@ Notes:
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -54,7 +53,6 @@ Notes:
         }
       }).observe({
         type: "interaction-contentful-paint",
-        includeSoftNavigationObservations: true,
       });
     });
     if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/broken-image-icon.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/broken-image-icon.html
index 1dd21288fec..f058a4b55c2 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/broken-image-icon.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/broken-image-icon.html
@@ -36,7 +36,6 @@ Notes:
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -45,12 +44,10 @@ Notes:
     const promise = Promise.all([
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "interaction-contentful-paint",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "soft-navigation",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
     ]);
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/contracted-image.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/contracted-image.html
index dae7793f08c..631627d5d11 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/contracted-image.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/contracted-image.html
@@ -41,7 +41,6 @@
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -50,12 +49,10 @@
     const promises = Promise.all([
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "soft-navigation",
-        /*includeSoftNavigationObservations=*/ false,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "interaction-contentful-paint",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
     ]);
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/cross-origin-image.sub.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/cross-origin-image.sub.html
index 777dcf70640..72cfd2fab44 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/cross-origin-image.sub.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/cross-origin-image.sub.html
@@ -35,14 +35,12 @@
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
     assert_equals(lcpEntries[0].id, "click-target", "The first entry should be the button");
     const softLcpPromise = SoftNavigationTestHelper.getPerformanceEntries(
       /*type=*/ "interaction-contentful-paint",
-      /*includeSoftNavigationObservations=*/ true,
       /*minNumEntries=*/ 1,
     );
     if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/expanded-image.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/expanded-image.html
index 1a482b293fc..1b3d2f603f7 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/expanded-image.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/expanded-image.html
@@ -37,7 +37,6 @@ Notes:
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -46,12 +45,10 @@ Notes:
     const promise = Promise.all([
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "interaction-contentful-paint",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "soft-navigation",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
     ]);
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/first-paint-equals-lcp-text.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/first-paint-equals-lcp-text.html
index b78f1a8e8bf..c14092e168c 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/first-paint-equals-lcp-text.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/first-paint-equals-lcp-text.html
@@ -34,7 +34,6 @@ Notes:
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -43,17 +42,14 @@ Notes:
     const promise = Promise.all([
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "soft-navigation",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "element",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "interaction-contentful-paint",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 1,
       ),
     ]);
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/iframe-content-not-observed.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/iframe-content-not-observed.html
index 4a9bf86ff49..629695c644b 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/iframe-content-not-observed.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/iframe-content-not-observed.html
@@ -32,7 +32,6 @@ Notes:
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1);
@@ -40,14 +39,12 @@ Notes:
 
     const softNavigationPromise = SoftNavigationTestHelper.getPerformanceEntries(
       /*type=*/ "soft-navigation",
-      /*includeSoftNavigationObservations=*/ true,
       /*minNumEntries=*/ 1,
     ).then((entries) => {
       assert_unreached("Should not have received a soft navigation entry!");
     });
     const softLcpPromise = SoftNavigationTestHelper.getPerformanceEntries(
       /*type=*/ "interaction-contentful-paint",
-      /*includeSoftNavigationObservations=*/ true,
       /*minNumEntries=*/ 1,
     ).then((entries) => {
       assert_unreached("Should not have received an a soft LCP entry!");
diff --git a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/raf-loop.html b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/raf-loop.html
index a047d6a8fb3..0c0cd8148a0 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/raf-loop.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/lcp/tentative/raf-loop.html
@@ -32,7 +32,7 @@
         smallLcpIssued = true;
         observer.disconnect();
       }
-    }).observe({ type: "interaction-contentful-paint", includeSoftNavigationObservations: true });
+    }).observe({ type: "interaction-contentful-paint" });
 
     document.body.innerHTML = `
           <div id='small-lcp'>Hello, world.</div>
@@ -57,7 +57,6 @@
     const helper = new SoftNavigationTestHelper(t);
     const lcpEntries = await helper.getBufferedPerformanceEntriesWithTimeout(
       /*type=*/ "largest-contentful-paint",
-      /*includeSoftNavigationObservations=*/ false,
       /*minNumEntries=*/ 1,
     );
     assert_equals(lcpEntries.length, 1, "There should be only one LCP entry");
@@ -66,12 +65,10 @@
     const promise = Promise.all([
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "soft-navigation",
-        /*includeSoftNavigationObservations=*/ false,
         /*minNumEntries=*/ 1,
       ),
       SoftNavigationTestHelper.getPerformanceEntries(
         /*type=*/ "interaction-contentful-paint",
-        /*includeSoftNavigationObservations=*/ true,
         /*minNumEntries=*/ 2,
       ),
     ]);
diff --git a/tests/wpt/tests/soft-navigation-heuristics/navigation-api-view-transition.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/navigation-api-view-transition.tentative.html
index 97070271c38..bab9c1f7073 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/navigation-api-view-transition.tentative.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/navigation-api-view-transition.tentative.html
@@ -27,8 +27,7 @@
           async handler() {
             const lcp_promise = new Promise(resolve => {
              (new PerformanceObserver(list => resolve())).observe(
-               {type: 'largest-contentful-paint',
-                includeSoftNavigationObservations: true});
+               {type: 'largest-contentful-paint'});
              });
             const transition = document.startViewTransition(async () => {
               const main = document.getElementById('main');
diff --git a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
index 666040833a2..8f936a767dc 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
@@ -33,7 +33,7 @@ function getNextEntry(type) {
       observer.disconnect();
       assert_equals(entries.length, 1, 'Only one entry.');
       resolve(entries[0]);
-    }).observe({ type, includeSoftNavigationObservations: true });
+    }).observe({ type });
   });
 }
 
@@ -45,7 +45,7 @@ function getBufferedEntries(type) {
       }
       resolve(list.getEntries());
       observer.disconnect();
-    }).observe({ type, buffered: true, includeSoftNavigationObservations: true });
+    }).observe({ type, buffered: true });
   });
 }
 
diff --git a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-test-helper.js b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-test-helper.js
index d4b6ad04a78..d19bbc2e350 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-test-helper.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-test-helper.js
@@ -53,15 +53,13 @@ class SoftNavigationTestHelper {
    * Waits for a number of buffered performance entries of a given type,
    * optionally including soft navigation observations, with a timeout message.
    * @param {string} type The type of the entries to wait for.
-   * @param {boolean} includeSoftNavigationObservations Whether to include
-   *     soft navigation observations.
    * @param {number} minNumEntries The minimum number of entries to wait for.
    * @param {number=} timeout The timeout in milliseconds. Defaults to 1000.
    * @return {!Promise} The promise, which either resolves with the entries or
    *     rejects with a timeout message.
    */
   async getBufferedPerformanceEntriesWithTimeout(
-      type, includeSoftNavigationObservations, minNumEntries, timeout = 1000) {
+      type, minNumEntries, timeout = 1000) {
     let observer;
     return this
         .newPromiseWithTimeoutMessage(
@@ -76,14 +74,9 @@ class SoftNavigationTestHelper {
               observer.observe({
                 type: type,
                 buffered: true,
-                includeSoftNavigationObservations:
-                    includeSoftNavigationObservations,
               });
             },
-            `${minNumEntries} entries of type ${type}${
-                includeSoftNavigationObservations ?
-                    ' with soft navigation observations' :
-                    ''} never arrived`,
+            `${minNumEntries} entries of type ${type} never arrived`,
             timeout)
         .finally(() => {
           observer.disconnect();
@@ -94,13 +87,11 @@ class SoftNavigationTestHelper {
    * Waits for a number of performance entries of a given type,
    * optionally including soft navigation observations.
    * @param {string} type The type of the entries to wait for.
-   * @param {boolean} includeSoftNavigationObservations Whether to include
-   *     soft navigation observations.
    * @param {number} minNumEntries The minimum number of entries to wait for.
    * @return {!Promise} The promise, which resolves with the entries.
    */
   static getPerformanceEntries(
-      type, includeSoftNavigationObservations, minNumEntries) {
+      type, minNumEntries) {
     return new Promise((resolve) => {
       const entries = [];
       const observer = new PerformanceObserver((list) => {
@@ -112,7 +103,6 @@ class SoftNavigationTestHelper {
       })
       observer.observe({
         type: type,
-        includeSoftNavigationObservations: includeSoftNavigationObservations,
       });
     });
   }
diff --git a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/almost-soft-navigation.html b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/almost-soft-navigation.html
index c66495be7d6..952f4ca77a8 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/almost-soft-navigation.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/almost-soft-navigation.html
@@ -88,7 +88,6 @@
         promise_test(async (t) => {
           const promise = SoftNavigationTestHelper.getPerformanceEntries(
             "soft-navigation",
-            /*includeSoftNavigationObservations=*/ false,
             /*minNumEntries=*/ 1,
           );
           if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/dom.html b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/dom.html
index e663b79081e..201b9fb8d04 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/dom.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/dom.html
@@ -105,7 +105,6 @@
         promise_test(async (t) => {
           const promise = SoftNavigationTestHelper.getPerformanceEntries(
             "soft-navigation",
-            /* includeSoftNavigationObservations= */ false,
             /* minNumEntries= */ 1,
           );
           if (test_driver) {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/lcp.html b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/lcp.html
index 2b57e6ce196..99791532325 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/lcp.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/smoke/tentative/lcp.html
@@ -32,7 +32,6 @@
         // we may later observe the soft navigation LCP entry in addition.
         const initial_lcp = await helper.getBufferedPerformanceEntriesWithTimeout(
           /*type=*/ "largest-contentful-paint",
-          /*include_soft_navigation_observations=*/ false,
           /*min_num_entries=*/ 1,
         );
 
@@ -52,12 +51,10 @@
         const results = await Promise.allSettled([
           helper.getBufferedPerformanceEntriesWithTimeout(
             /*type=*/ "soft-navigation",
-            /*include_soft_navigation_observations=*/ true,
             /*min_num_entries=*/ 1,
           ),
           helper.getBufferedPerformanceEntriesWithTimeout(
             /*type=*/ "interaction-contentful-paint",
-            /*include_soft_navigation_observations=*/ true,
             /*min_num_entries=*/ 1,
           ),
         ]);
diff --git a/tests/wpt/tests/speculation-rules/prerender/cross-origin-iframe-prerender.https.html b/tests/wpt/tests/speculation-rules/prerender/cross-origin-iframe-prerender.https.html
new file mode 100644
index 00000000000..76ed9bf71de
--- /dev/null
+++ b/tests/wpt/tests/speculation-rules/prerender/cross-origin-iframe-prerender.https.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!--
+Tests for cross-origin iframes `document.prerendering` state with
+`Supports-Loading-Mode: prerender-cross-origin-frames` header.
+-->
+<title>Load a cross-origin document in a prerendered iframe</title>
+<meta name="variant" content="?target_hint=_self">
+<meta name="variant" content="?target_hint=_blank">
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="../resources/utils.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<script>
+setup(() => assertSpeculationRulesIsSupported());
+
+promise_test(async t => {
+  const uid = token();
+  const bc = new PrerenderChannel('test-channel', uid);
+
+  const gotMessage = new Promise(resolve => {
+    bc.addEventListener('message', e => {
+      resolve(e.data);
+    }, {
+      once: true
+    });
+  });
+  const url = `resources/cross-origin-iframe-prerender.html?uid=${uid}&target_hint=${getTargetHint()}`;
+  window.open(url, '_blank', 'noopener');
+
+  const result = await gotMessage;
+  assert_equals(result, 'iframe prerender finished correctly.');
+
+  bc.close();
+
+  // Send a close signal to PrerenderEventCollector on the prerendered page.
+  new PrerenderChannel('close', uid).postMessage('');
+}, `cross-origin iframes should be prerendered with prerender-cross-origin-frame header.`);
+</script>
diff --git a/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html
new file mode 100644
index 00000000000..251f492b3c5
--- /dev/null
+++ b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html
@@ -0,0 +1,80 @@
+<!DOCTYPE html>
+<script src="/common/utils.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/speculation-rules/prerender/resources/utils.js"></script>
+<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
+<body>
+<script>
+
+async function main() {
+  const iframe_uid = token();
+  const iFrameChannel = new PrerenderChannel('iframe-channel',iframe_uid);
+  const crossOriginUrl =
+      new URL(`cross-origin-iframe-src-prerender.html?uid=${iframe_uid}`,
+              get_host_info()['HTTPS_REMOTE_ORIGIN'] +
+                  window.location.pathname);
+
+  // Send the observed events back to the main test page.
+  const testChannel = new PrerenderChannel('test-channel');
+
+  // Start loading a cross-origin iframe. The iframe messages us with the
+  // value of its document.prerendering, which should be true on load and
+  // then get to false.
+  const crossOriginIframe = document.createElement('iframe');
+  crossOriginIframe.src = crossOriginUrl.href;
+  document.body.appendChild(crossOriginIframe);
+  // Wait iframe load to confirm prerenderingchange listener registration.
+  await new Promise((resolve, reject) => {
+    //window.addEventListener('message', (e) => {
+    iFrameChannel.addEventListener('message', (e) => {
+      if (e.data == 'onload')
+        resolve();
+      else
+        reject('bad message: ' + e.data);
+    }, {once: true});
+  }).catch( (error)=> {
+    testChannel.postMessage(error);
+  });
+
+  // Async wait finishing prerendering in the iframe and report it.
+  new Promise((resolve, reject) => {
+    iFrameChannel.addEventListener('message', (e) => {
+     if (e.data == 'document.prerendering changes to false from true')
+       resolve();
+     else
+       reject('bad message: ' + e.data);
+    }, {once:true});
+  }).then(()=>{
+    message = 'iframe prerender finished correctly.';
+  }, (error)=>{
+    message = error;
+  }).finally(()=>{
+    iFrameChannel.close();
+    testChannel.postMessage(message);
+    testChannel.close();
+  });
+
+  // Activate this page to activate the iframe too.
+  const prerenderChannel = new PrerenderChannel('prerender-channel');
+  prerenderChannel.postMessage('readyToActivate');
+  prerenderChannel.close();
+
+  new PrerenderChannel('close').addEventListener('message', () => {
+      window.close();
+  });
+}
+
+// The main test page (cross-origin-iframe-prerender.https.html) loads the
+// initiator page, then the initiator page will prerender itself with the
+// `prerendering` parameter.
+const params = new URLSearchParams(location.search);
+if (!params.has('prerendering')) {
+  const rule_extras = {'target_hint': getTargetHint()};
+  loadInitiatorPage(rule_extras);
+} else {
+  main();
+}
+</script>
+</body>
diff --git a/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html.headers b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html.headers
new file mode 100644
index 00000000000..df5bb3bd34a
--- /dev/null
+++ b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-prerender.html.headers
@@ -0,0 +1 @@
+Supports-Loading-Mode: prerender-cross-origin-frames
diff --git a/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-src-prerender.html b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-src-prerender.html
new file mode 100644
index 00000000000..a421e1c881d
--- /dev/null
+++ b/tests/wpt/tests/speculation-rules/prerender/resources/cross-origin-iframe-src-prerender.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<body>
+<script src="/speculation-rules/prerender/resources/utils.js"></script>
+<script>
+const prerenderChannel = new PrerenderChannel('iframe-channel');
+
+const initial_prerendering = document.prerendering;
+
+document.addEventListener('prerenderingchange', () => {
+  prerenderChannel.postMessage('document.prerendering changes to '  +
+    `${document.prerendering} from ${initial_prerendering}`, '*');
+  prerenderChannel.close();
+});
+
+prerenderChannel.postMessage('onload');
+</script>
+foobar
+</body>
diff --git a/tests/wpt/tests/svg/animations/svgcolor-animation-invalid-value-1.html b/tests/wpt/tests/svg/animations/svgcolor-animation-invalid-value-1.html
new file mode 100644
index 00000000000..aa3046a5036
--- /dev/null
+++ b/tests/wpt/tests/svg/animations/svgcolor-animation-invalid-value-1.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<title>
+  Test SVGColor animation with invalid value: Invalid color string in from attribute
+</title>
+<link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#FromAttribute">
+<link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#ToAttribute">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<svg id="svg">
+  <rect id="rect" width="100px" height="100px" fill="green">
+    <animate attributeName="fill" from="gr   een" to="red" dur="3s" begin="0s" fill="freeze" />
+  </rect>
+</svg>
+
+<script>
+
+async_test(t => {
+  const svg = document.getElementById("svg");
+  const rect = document.getElementById("rect");
+
+  window.addEventListener('load', t.step_func(() => {
+    svg.setCurrentTime(2);
+
+      requestAnimationFrame(t.step_func_done(() => {
+        assert_equals(rect.getAttribute("fill"), "green");
+        assert_equals(window.getComputedStyle(rect).fill, "rgb(0, 128, 0)"); // green
+      }));
+    }));
+  });
+
+</script>
+
diff --git a/tests/wpt/tests/svg/linking/scripted/a.type-getter-01.svg b/tests/wpt/tests/svg/linking/scripted/a.type-getter-01.svg
new file mode 100644
index 00000000000..3486531e707
--- /dev/null
+++ b/tests/wpt/tests/svg/linking/scripted/a.type-getter-01.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVGAElement.type getter</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/linking.html#InterfaceSVGAElement"/>
+  </metadata>
+  <a id="test" href="a"></a>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+    test(function() {
+      var a = document.getElementById("test");
+
+      test(function() {
+        assert_equals(a.type, "");
+       }, "Test anchor's type getter when type attribute missing");
+    });
+  ]]></script>
+</svg>
\ No newline at end of file
diff --git a/tests/wpt/tests/svg/linking/scripted/a.type-getter-02.svg b/tests/wpt/tests/svg/linking/scripted/a.type-getter-02.svg
new file mode 100644
index 00000000000..ef628de940f
--- /dev/null
+++ b/tests/wpt/tests/svg/linking/scripted/a.type-getter-02.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVGAElement.type getter</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/linking.html#InterfaceSVGAElement"/>
+  </metadata>
+  <a id="test" href="a" type="text/plain"></a>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+    test(function() {
+      var a = document.getElementById("test");
+
+      test(function() {
+        assert_equals(a.type, "text/plain");
+       }, "Test anchor's type getter");
+    });
+  ]]></script>
+</svg>
\ No newline at end of file
diff --git a/tests/wpt/tests/svg/linking/scripted/a.type-setter-01.svg b/tests/wpt/tests/svg/linking/scripted/a.type-setter-01.svg
new file mode 100644
index 00000000000..012b293c9da
--- /dev/null
+++ b/tests/wpt/tests/svg/linking/scripted/a.type-setter-01.svg
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVGAElement.type setter</title>
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/linking.html#InterfaceSVGAElement"/>
+  </metadata>
+  <a id="test" href="a"></a>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+    test(function() {
+        var a = document.getElementById("test");
+
+        test(function() {
+            a.type = "plain/text"
+            assert_equals(a.type, "plain/text");
+        }, "Test anchor's type setter");
+    });
+  ]]></script>
+</svg>
\ No newline at end of file
diff --git a/tests/wpt/tests/svg/text/parsing/text-decoration-color-computed.svg b/tests/wpt/tests/svg/text/parsing/text-decoration-color-computed.svg
new file mode 100644
index 00000000000..ffefb6aac1f
--- /dev/null
+++ b/tests/wpt/tests/svg/text/parsing/text-decoration-color-computed.svg
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG CSS Text Decoration Test: getComputedStyle().textDecorationColor</title>
+  <metadata>
+    <h:link rel="help" ref="https://drafts.csswg.org/css-text-decor-3/#text-decoration-color-property"/>
+    <h:meta name="assert" content="SVG text-decoration-color computed value is as specified."/>
+  </metadata>
+  <style>
+    #container {
+      color: rgb(255, 0, 0);
+      text-decoration-color: currentcolor;
+    }
+    #target {
+      color: rgb(0, 255, 0);
+    }
+  </style>
+  <g id="container">
+    <g id="target"></g>
+  </g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+test_computed_value("text-decoration-color", "rgb(0, 0, 255)");
+test_computed_value("text-decoration-color", "currentcolor", "rgb(0, 255, 0)");
+test_computed_value("text-decoration-color", "inherit", "rgb(0, 255, 0)"); // currentcolor
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/tests/svg/text/parsing/text-decoration-fill-computed.tentative.svg b/tests/wpt/tests/svg/text/parsing/text-decoration-fill-computed.tentative.svg
new file mode 100644
index 00000000000..9a37a9ea1a8
--- /dev/null
+++ b/tests/wpt/tests/svg/text/parsing/text-decoration-fill-computed.tentative.svg
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Text CSS Decoration Test: getComputedStyle().textDecorationFill</title>
+  <metadata>
+    <h:link rel="help" ref="https://drafts.fxtf.org/fill-stroke/#text-decor"/>
+    <h:meta name="assert" content="SVG text-decoration-fill computed value is as specified."/>
+  </metadata>
+  <g id="target"></g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+test_computed_value("text-decoration-fill", "none");
+test_computed_value("text-decoration-fill", "context-fill");
+test_computed_value("text-decoration-fill", "context-stroke");
+test_computed_value("text-decoration-fill", "rgb(12, 34, 56)");
+
+test_computed_value("text-decoration-fill", 'url("https://example.com/")');
+test_computed_value("text-decoration-fill", 'url("https://example.com/") none');
+test_computed_value("text-decoration-fill", 'url("https://example.com/") rgb(12, 34, 56)');
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/tests/svg/text/parsing/text-decoration-line-computed.svg b/tests/wpt/tests/svg/text/parsing/text-decoration-line-computed.svg
new file mode 100644
index 00000000000..d7ea07662f7
--- /dev/null
+++ b/tests/wpt/tests/svg/text/parsing/text-decoration-line-computed.svg
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Text CSS Decoration Test: getComputedStyle().textDecorationLine</title>
+  <metadata>
+    <h:link rel="help" ref="https://drafts.csswg.org/css-text-decor-4/#text-decoration-line-property"/>
+    <h:meta name="assert" content="SVG text-decoration-line computed value is as specified."/>
+  </metadata>
+  <g id="target"></g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+// none
+test_computed_value("text-decoration-line", "none");
+
+// underline || overline || line-through || blink
+test_computed_value("text-decoration-line", "underline");
+test_computed_value("text-decoration-line", "overline");
+test_computed_value("text-decoration-line", "line-through");
+test_computed_value("text-decoration-line", "blink");
+test_computed_value("text-decoration-line", "underline overline");
+test_computed_value("text-decoration-line", "underline line-through");
+test_computed_value("text-decoration-line", "underline blink");
+test_computed_value("text-decoration-line", "overline line-through");
+test_computed_value("text-decoration-line", "overline blink");
+test_computed_value("text-decoration-line", "line-through blink");
+test_computed_value("text-decoration-line", "underline overline line-through");
+test_computed_value("text-decoration-line", "underline overline blink");
+test_computed_value("text-decoration-line", "underline line-through blink");
+test_computed_value("text-decoration-line", "overline line-through blink");
+test_computed_value("text-decoration-line", "underline overline line-through blink");
+
+// spelling-error
+test_computed_value("text-decoration-line", "spelling-error");
+
+// grammar-error
+test_computed_value("text-decoration-line", "grammar-error");
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/tests/svg/text/parsing/text-decoration-stroke-computed.tentative.svg b/tests/wpt/tests/svg/text/parsing/text-decoration-stroke-computed.tentative.svg
new file mode 100644
index 00000000000..da7e9509fdf
--- /dev/null
+++ b/tests/wpt/tests/svg/text/parsing/text-decoration-stroke-computed.tentative.svg
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Text CSS Decoration Test: getComputedStyle().textDecorationStroke</title>
+  <metadata>
+    <h:link rel="help" ref="https://drafts.fxtf.org/fill-stroke/#text-decor"/>
+    <h:meta name="assert" content="SVG text-decoration-stroke computed value is as specified."/>
+  </metadata>
+  <g id="target"></g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+test_computed_value("text-decoration-stroke", "none");
+test_computed_value("text-decoration-stroke", "context-fill");
+test_computed_value("text-decoration-stroke", "context-stroke");
+test_computed_value("text-decoration-stroke", "rgb(12, 34, 56)");
+
+test_computed_value("text-decoration-stroke", 'url("https://example.com/")');
+test_computed_value("text-decoration-stroke", 'url("https://example.com/") none');
+test_computed_value("text-decoration-stroke", 'url("https://example.com/") rgb(12, 34, 56)');
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/tests/svg/text/parsing/text-decoration-style-computed.svg b/tests/wpt/tests/svg/text/parsing/text-decoration-style-computed.svg
new file mode 100644
index 00000000000..6f307ff0dca
--- /dev/null
+++ b/tests/wpt/tests/svg/text/parsing/text-decoration-style-computed.svg
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>SVG Text CSS Decoration Test: getComputedStyle().textDecorationStyle</title>
+  <metadata>
+    <h:link rel="help" ref="https://drafts.csswg.org/css-text-decor-3/#text-decoration-style-property"/>
+    <h:meta name="assert" content="SVG text-decoration-style computed value is as specified."/>
+  </metadata>
+  <g id="target"></g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+
+test_computed_value("text-decoration-style", "solid");
+test_computed_value("text-decoration-style", "double");
+test_computed_value("text-decoration-style", "dotted");
+test_computed_value("text-decoration-style", "dashed");
+test_computed_value("text-decoration-style", "wavy");
+
+  ]]></script>
+</svg>
diff --git a/tests/wpt/tests/tools/ci/azure/configure_watson.yml b/tests/wpt/tests/tools/ci/azure/configure_watson.yml
new file mode 100644
index 00000000000..4bec7ecb43b
--- /dev/null
+++ b/tests/wpt/tests/tools/ci/azure/configure_watson.yml
@@ -0,0 +1,42 @@
+steps:
+- powershell: |
+    # Configure Windows Error Reporting (Watson) for crash dump collection
+    # This enables automatic crash dump generation for debugging browser and WebDriver crashes
+    # Only enabled when System.Debug is true to avoid disk space issues in normal runs
+    try {
+        Write-Host "Configuring Windows Error Reporting (Watson) for crash dump collection..."
+        
+        # Enable Windows Error Reporting
+        Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\Windows Error Reporting" -Name "Disabled" -Value 0 -Type DWord -Force
+        Write-Host "✓ Windows Error Reporting enabled"
+        
+        # Configure local dump collection
+        $localDumpsPath = "HKLM:\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps"
+        if (!(Test-Path $localDumpsPath)) {
+            New-Item -Path $localDumpsPath -Force | Out-Null
+            Write-Host "✓ LocalDumps registry key created"
+        }
+        
+        # Set dump folder to artifact staging directory so dumps are automatically published
+        Set-ItemProperty -Path $localDumpsPath -Name "DumpFolder" -Value "$(Build.ArtifactStagingDirectory)" -Type ExpandString -Force
+        Write-Host "✓ Dump folder configured: $(Build.ArtifactStagingDirectory)"
+        
+        # Configure dump type (2 = full dump with all memory)
+        Set-ItemProperty -Path $localDumpsPath -Name "DumpType" -Value 2 -Type DWord -Force
+        Write-Host "✓ Dump type set to full dump"
+
+        # Keep up to 10 crash dumps to avoid filling disk space
+        Set-ItemProperty -Path $localDumpsPath -Name "DumpCount" -Value 10 -Type DWord -Force
+        Write-Host "✓ Dump count limit set to 10"
+
+        Write-Host ""
+        Write-Host "Windows Error Reporting configured successfully!"
+        Write-Host "Any browser or WebDriver crashes will generate crash dumps in the artifacts."
+    }
+    catch {
+        Write-Warning "Failed to configure Windows Error Reporting: $($_.Exception.Message)"
+        Write-Warning "Registry access may be restricted on this machine."
+        Write-Host "Continuing without crash dump collection..."
+    }
+  displayName: 'Configure Watson crash reporting (debug mode)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'), eq(variables['System.Debug'], 'true'))
diff --git a/tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html b/tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html
deleted file mode 100644
index 6ae71b69880..00000000000
--- a/tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html
+++ /dev/null
@@ -1,48 +0,0 @@
-<!DOCTYPE html>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="support/helper.sub.js"></script>
-<meta http-equiv="Content-Security-Policy" content="trusted-types *">
-
-<body>
-<script>
-
-  test(t => {
-    event_listener = (e) => {
-      assert_equals(e.policyName, "default");
-      e.preventDefault(); // don't let this policy be created.
-    };
-    trustedTypes.addEventListener('beforecreatepolicy', event_listener, {once:true});
-    assert_throws_dom("NotAllowedError", () => trustedTypes.createPolicy("default", {}));
-  }, 'Block Trusted Type policy creation by event listener.');
-
-  test(t => {
-    let flag = false;
-    event_listener = (e) => {
-      assert_equals(e.policyName, "myPolicy");
-      flag = true;
-    };
-    trustedTypes.addEventListener('beforecreatepolicy', event_listener, {once:true});
-    trustedTypes.createPolicy("myPolicy", {});
-    assert_equals(flag, true);
-  }, 'Trusted Type policy creation.');
-
-  test(t => {
-    event_listener = (e) => {
-      if (e.policyName === "default")
-        e.preventDefault();
-    };
-    trustedTypes.addEventListener('beforecreatepolicy', event_listener, {once:true});
-    assert_throws_dom("NotAllowedError", () => trustedTypes.createPolicy("default", {}));
-    trustedTypes.createPolicy("newPolicy", {});
-  }, 'Block only default Trusted Type policy creation.');
-
-  test(t => {
-    event_listener = (e) => {
-      assert_unreached();
-    };
-    trustedTypes.createPolicy("test", {});
-    trustedTypes.addEventListener('beforecreatepolicy', event_listener, {once:true});
-  }, 'Policy creation called before addEventListener function will not reached the listener.');
-
-</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/virtual-keyboard/WEB_FEATURES.yml b/tests/wpt/tests/virtual-keyboard/WEB_FEATURES.yml
new file mode 100644
index 00000000000..3f6ef03c6da
--- /dev/null
+++ b/tests/wpt/tests/virtual-keyboard/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: virtual-keyboard
+  files: "**"
diff --git a/tests/wpt/tests/wai-aria/role/fallback-roles.html b/tests/wpt/tests/wai-aria/role/fallback-roles.html
index 98011570b4f..320b5b7ddbd 100644
--- a/tests/wpt/tests/wai-aria/role/fallback-roles.html
+++ b/tests/wpt/tests/wai-aria/role/fallback-roles.html
@@ -48,9 +48,24 @@
 button" data-testname="div[role=button] ignoring line break" aria-label="x" data-expectedrole="button" class="ex">x</div>
   <div role="⠀ button" data-testname="div[role=button] ignoring braille whitespace char" aria-label="x" data-expectedrole="button" class="ex">x</div>
 
+  <!-- various role capitalization styles and their fallbacks -->
+  <div role="foo Link" data-testname="div[role='foo Link'][tabindex=0], illegal role and capitalized fallback role, has link role" aria-label="x" tabindex="0" data-expectedrole="link" class="ex">x</div>
+  <button role="foo Link" data-testname="button[role='foo Link'] with illegal role and capitalized fallback role, has link role" data-expectedrole="link" class="ex"></button>
+  <nav role="foo GROUP" data-testname="nav[role='foo GROUP'] with illegal role and all upper case fallback role, has group role" aria-label="x" data-expectedrole="group" class="ex">x</nav>
+  <div role="foo ReGiOn" data-testname="div[role='foo ReGiOn'][aria-label] with illegal role and alternating case fallback role, has region role" aria-label="x" data-expectedrole="region" class="ex">x</div>
+  <div role="ReGiOn foo" data-testname="div[role='ReGiOn foo'] with alternating case role and illegal fallback role without accname, has generic role" class="ex-generic">x</div>
+  <div role="ReGiOn foo" data-testname="div[role='ReGiOn foo'][aria-label] with alternating case role and illegal fallback role, has region role" aria-label="x" data-expectedrole="region" class="ex">x</div>
+
+  <div role="BUTTON LINK" data-testname="div[role='BUTTON LINK'] with tabindex=0, has button role" aria-label="x" tabindex="0" data-expectedrole="button" class="ex">x</div>
+  <div role="ReGiOn group" data-testname="div[role='ReGiOn group'] without accname, has group role" data-expectedrole="group" class="ex">x</div>
+  <div role="ReGiOn group" data-testname="div[role='ReGiOn group'][aria-label], has region role" aria-label="x" data-expectedrole="region" class="ex">x</div>
+
+    <div role="
+buTtOn" data-testname="div[role=buTtOn] ignoring line break, has button role" tabindex="0" aria-label="x" data-expectedrole="button" class="ex">x</div>
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/wai-aria/role/roles.html b/tests/wpt/tests/wai-aria/role/roles.html
index 844da3ce47b..b645a4a78b2 100644
--- a/tests/wpt/tests/wai-aria/role/roles.html
+++ b/tests/wpt/tests/wai-aria/role/roles.html
@@ -11,7 +11,10 @@
 </head>
 <body>
 
-<p>Tests most <a href="https://w3c.github.io/aria/#role_definitions">ARIA role definitions</a>. See comments for more info.</p>
+<h1>Tests most <a href="https://w3c.github.io/aria/#role_definitions">ARIA role definitions</a>. See comments for more info.</h1>
+
+<!-- Tested via AriaUtils.assignAndVerifyRolesByRoleNames() in <script> block below  -->
+<!-- Also tests role capitalization styles, in addition to "role": "ROLE", "Role"    -->
 
 <script>
 
@@ -28,7 +31,7 @@ Tests simple role assignment: <div role="alert">x</div>
 
 */
 
-AriaUtils.assignAndVerifyRolesByRoleNames([
+let ariaRoles = [
   "alert",
   "alertdialog",
   "application",
@@ -133,7 +136,22 @@ AriaUtils.assignAndVerifyRolesByRoleNames([
   // "treegrid" -> ./treegrid-roles.html
   // "widget" -> ./abstract-roles.html
   // "window" -> ./abstract-roles.html
-]);
+];
+
+// Lower case
+AriaUtils.assignAndVerifyRolesByRoleNames(ariaRoles);
+
+// Upper case
+AriaUtils.assignAndVerifyRolesByRoleNames(
+  ariaRoles.map(role => role.toUpperCase())
+);
+
+// Sentence case
+AriaUtils.assignAndVerifyRolesByRoleNames(
+  ariaRoles.map(role =>
+    role.charAt(0).toUpperCase() + role.slice(1).toLowerCase()
+  )
+);
 
 </script>
 </body>
diff --git a/tests/wpt/tests/wai-aria/scripts/aria-utils.js b/tests/wpt/tests/wai-aria/scripts/aria-utils.js
index ec53464c18f..bf86dd051c3 100644
--- a/tests/wpt/tests/wai-aria/scripts/aria-utils.js
+++ b/tests/wpt/tests/wai-aria/scripts/aria-utils.js
@@ -20,7 +20,7 @@ const AriaUtils = {
         el.setAttribute("role", role); // el.role not yet supported by Gecko.
         document.body.appendChild(el);
         const computedRole = await test_driver.get_computed_role(el);
-        assert_equals(computedRole, role, el.outerHTML);
+        assert_equals(computedRole, role.toLowerCase(), el.outerHTML);
       }, `role: ${role}`);
     }
   },
diff --git a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-alternate.tentative.html b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-alternate.tentative.html
index 6929c4cd38a..5be5738e9ac 100644
--- a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-alternate.tentative.html
+++ b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-alternate.tentative.html
@@ -31,7 +31,7 @@
           eventType: "click",
           eventTarget: eventTarget
         });
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "click", "play-alternate");
         await waitForAnimationFrames(1);
         assert_equals(animation.playState, "idle", "animation is idle");
         assert_equals(animation.playbackRate, 1, "playbackRate is initially 1");
diff --git a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-before-handlers.tentative.html b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-before-handlers.tentative.html
index 715c5bcddfc..d2e9ebdadc4 100644
--- a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-before-handlers.tentative.html
+++ b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-before-handlers.tentative.html
@@ -38,7 +38,7 @@
           eventType: "click",
           eventTarget: eventTarget
         });
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "click", "play");
         await waitForAnimationFrames(2);
         assert_equals(animation.playState, "idle", "animation is idle");
         await test_driver.click(eventTarget);
diff --git a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-once.tentative.html b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-once.tentative.html
index 76b31373c14..f19d0fa9adb 100644
--- a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-once.tentative.html
+++ b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-once.tentative.html
@@ -31,7 +31,7 @@
           eventType: "click",
           eventTarget: eventTarget
         });
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "click", "play-once");
         await waitForAnimationFrames(1);
         assert_equals(animation.playState, "idle", "animation is idle");
         await test_driver.click(eventTarget);
diff --git a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-repeat.tentative.html b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-repeat.tentative.html
index e54e19f1fee..0dace937f67 100644
--- a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-repeat.tentative.html
+++ b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-repeat.tentative.html
@@ -31,7 +31,7 @@
           eventType: "click",
           eventTarget: eventTarget
         });
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "click", "replay");
         await waitForAnimationFrames(1);
         assert_equals(animation.playState, "idle", "animation is idle");
         await test_driver.click(eventTarget);
diff --git a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-state.tentative.html b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-state.tentative.html
index 2bc3e6d718b..70a71f96182 100644
--- a/tests/wpt/tests/web-animations/animation-trigger/event-trigger-state.tentative.html
+++ b/tests/wpt/tests/web-animations/animation-trigger/event-trigger-state.tentative.html
@@ -31,7 +31,7 @@
           eventType: "click",
           eventTarget: eventTarget
         });
-        trigger.addAnimation(animation);
+        trigger.addAnimation(animation, "click", "play-pause");
         await waitForAnimationFrames(1);
         assert_equals(animation.playState, "idle", "animation is idle");
         await test_driver.click(eventTarget);
diff --git a/tests/wpt/tests/web-animations/interfaces/TimelineTrigger/constructor.html b/tests/wpt/tests/web-animations/interfaces/TimelineTrigger/constructor.html
index 6d82c6499dc..a61b659804a 100644
--- a/tests/wpt/tests/web-animations/interfaces/TimelineTrigger/constructor.html
+++ b/tests/wpt/tests/web-animations/interfaces/TimelineTrigger/constructor.html
@@ -11,7 +11,6 @@
 
   test(t => {
     const trigger = new TimelineTrigger();
-    assert_equals(trigger.behavior, "once", "default behavior is once.");
     assert_equals(trigger.timeline, document.timeline,
       "default timeline is document.timeline.");
     assert_equals(trigger.rangeStart, "normal", "default rangeStart is normal");
@@ -24,7 +23,6 @@
 
   test(t => {
     const trigger = new TimelineTrigger({});
-    assert_equals(trigger.behavior, "once", "default behavior is once.");
     assert_equals(trigger.timeline, document.timeline,
       "default timeline is document.timeline.");
     assert_equals(trigger.rangeStart, "normal", "default rangeStart is normal");
@@ -38,14 +36,12 @@
   test(t => {
     const scroll_timeline = new ScrollTimeline();
     const trigger = new TimelineTrigger({
-      behavior: "repeat",
       timeline: scroll_timeline,
       rangeStart: "contain 10%",
       rangeEnd: "contain 90%",
       exitRangeStart: "cover 10%",
       exitRangeEnd: "cover 90%"
     });
-    assert_equals(trigger.behavior, "repeat", "default behavior is repeat.");
     assert_equals(trigger.timeline, scroll_timeline,
       "timeline is supplied scroll timeline.");
     assert_equals(trigger.rangeStart, "contain 10%",
@@ -61,14 +57,12 @@
   test(t => {
     const view_timeline = new ViewTimeline();
     const trigger = new TimelineTrigger({
-      behavior: "repeat",
       timeline: view_timeline,
       rangeStart: "contain 10%",
       rangeEnd: "contain 90%",
       exitRangeStart: "cover 10%",
       exitRangeEnd: "cover 90%"
     });
-    assert_equals(trigger.behavior, "repeat", "behavior is supplied behavior.");
     assert_equals(trigger.timeline, view_timeline,
       "timeline is supplied scroll timeline.");
     assert_equals(trigger.rangeStart, "contain 10%",
diff --git a/tests/wpt/tests/web-nfc/WEB_FEATURES.yml b/tests/wpt/tests/web-nfc/WEB_FEATURES.yml
new file mode 100644
index 00000000000..38012ef8899
--- /dev/null
+++ b/tests/wpt/tests/web-nfc/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: web-nfc
+  files: "**"
diff --git a/tests/wpt/tests/web-otp/WEB_FEATURES.yml b/tests/wpt/tests/web-otp/WEB_FEATURES.yml
new file mode 100644
index 00000000000..fc3f44c6232
--- /dev/null
+++ b/tests/wpt/tests/web-otp/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: web-otp
+  files: "**"
diff --git a/tests/wpt/tests/webaudio/resources/audit-util.js b/tests/wpt/tests/webaudio/resources/audit-util.js
index 422c8f4678c..666bad1eff2 100644
--- a/tests/wpt/tests/webaudio/resources/audit-util.js
+++ b/tests/wpt/tests/webaudio/resources/audit-util.js
@@ -256,58 +256,6 @@ function assert_strict_constant_value(array, constantValue, message) {
   assert_true(allSame, message);
 }
 
-/**
- * Asserts that two arrays are approximately equal, element-wise, within a given
- * absolute threshold.
- * This is helpful when comparing floating-point buffers where exact equality is
- * not expected.
- *
- * @param {!Array<number>} actual - The actual output array.
- * @param {!Array<number>} expected - The expected reference array.
- * @param {number} threshold - The maximum allowed absolute difference between
- * corresponding elements.
- * @param {string} message - Description used for assertion failure messages.
- */
-function assert_array_approximately_equals(
-    actual, expected, threshold, message) {
-  assert_equals(
-      actual.length,
-      expected.length,
-      `${message} - buffer lengths must match`);
-  for (let i = 0; i < actual.length; ++i) {
-    assert_approx_equals(
-        actual[i], expected[i], threshold,
-        `${message} at index ${i}`);
-  }
-}
-
-/**
- * Asserts that two arrays are of equal length and that each corresponding
- * element is within a specified epsilon of each other. Throws an assertion
- * error if any element pair differs by more than epsilon or if the arrays
- * have different lengths.
- *
- * @param {Array<number>} actual - The array of actual values to test.
- * @param {Array<number>} expected - The array of expected values to compare
- *   against.
- * @param {number} epsilon - The maximum allowed difference between
- *   corresponding elements.
- * @param {string} desc - Description used in assertion error messages.
- */
-function assert_close_to_array(actual, expected, epsilon, desc) {
-  assert_equals(
-      actual.length,
-      expected.length,
-      `${desc}: length mismatch`);
-  for (let i = 0; i < actual.length; ++i) {
-    const diff = Math.abs(actual[i] - expected[i]);
-    assert_less_than_equal(
-        diff,
-        epsilon,
-        `${desc}[${i}] |${actual[i]} - ${expected[i]}| = ${diff} > ${epsilon}`);
-  }
-}
-
 /**
  * Asserts that all elements of an array are (approximately) equal to a value.
  *
@@ -324,3 +272,46 @@ function assert_array_constant_value(
             array[i], constantValue, epsilon, `${message} sample[${i}]`);
       }
 }
+
+/**
+ * Asserts that two arrays are equal within a given tolerance for each element.
+ * The |threshold| can be:
+ *   - A number (absolute epsilon)
+ *   - An object with optional {absoluteThreshold, relativeThreshold}
+ *   - If omitted, compares with exact equality (epsilon = 0)
+ *
+ * For each element i, we require:
+ *   |actual[i] − expected[i]| ≤ max(absoluteThreshold,
+ *                                   |expected[i]|·relativeThreshold)
+ *
+ * @param {!Array<number>|!TypedArray<number>} actual
+ * @param {!Array<number>|!TypedArray<number>} expected
+ * @param {number|{ absoluteThreshold?:number, relativeThreshold?:number }}
+ *   [threshold=0]
+ * @param {string} desc
+ */
+function assert_array_equal_within_eps(
+    actual, expected, threshold = 0, desc) {
+  assert_equals(actual.length, expected.length, desc + ': length mismatch');
+
+  let abs = 0;
+  let rel = 0;
+
+  if (typeof threshold === 'number') {
+    abs = threshold;
+  } else if (threshold && typeof threshold === 'object') {
+    abs = threshold.absoluteThreshold ?? 0;
+    rel = threshold.relativeThreshold ?? 0;
+  }
+
+  for (let i = 0; i < actual.length; ++i) {
+    const epsilon = Math.max(abs, Math.abs(expected[i]) * rel);
+    const diff = Math.abs(actual[i] - expected[i]);
+    assert_approx_equals(
+        actual[i],
+        expected[i],
+        epsilon,
+        `${desc} sample[${i}] |${actual[i]} - ${expected[i]}|` +
+            ` = ${diff} > ${epsilon}`);
+  }
+}
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html
index 25565b76866..0d4b2e1fcbd 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html
@@ -1,100 +1,84 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
-  <head>
-    <title>
-      Test Active Processing for AudioBufferSourceNode
-    </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>
+<head>
+  <title>
+    Test Active Processing for AudioBufferSourceNode
+  </title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/webaudio/resources/audit-util.js"></script>
+</head>
+<body>
+  <script>
+    // Arbitrary sample rate. And we only new a few blocks for rendering to
+    // see if things are working.
+    const sampleRate = 8000;
+    const renderLength = 10 * RENDER_QUANTUM_FRAMES;
 
-  <body>
-    <script id="layout-test-code">
-      let audit = Audit.createTaskRunner();
+    // Offline context used for the tests.
+    let context;
 
-      // Arbitrary sample rate. And we only new a few blocks for rendering to
-      // see if things are working.
-      let sampleRate = 8000;
-      let renderLength = 10 * RENDER_QUANTUM_FRAMES;
+    // Number of channels for the AudioBufferSource. Fairly arbitrary, but
+    // should be more than 2.
+    const numberOfChannels = 7;
 
-      // Offline context used for the tests.
-      let context;
+    // Number of frames in the AudioBuffer.  Fairly arbitrary, but should
+    // probably be more than one render quantum and significantly less than
+    // |renderLength|.
+    const bufferFrames = 131;
 
-      // Number of channels for the AudioBufferSource. Fairly arbitrary, but
-      // should be more than 2.
-      let numberOfChannels = 7;
+    const filePath =
+        '../the-audioworklet-interface/processors/input-count-processor.js';
 
-      // Number of frames in the AudioBuffer.  Fairly arbitrary, but should
-      // probably be more than one render quantum and significantly less than
-      // |renderLength|.
-      let bufferFrames = 131;
+    promise_test(async (t) => {
+      context = new OfflineAudioContext(
+          numberOfChannels, renderLength, sampleRate);
 
-      let filePath =
-          '../the-audioworklet-interface/processors/input-count-processor.js';
-
-      audit.define('Setup graph', (task, should) => {
-        context =
-            new OfflineAudioContext(numberOfChannels, renderLength, sampleRate);
-
-        should(
-            context.audioWorklet.addModule(filePath).then(() => {
-              let buffer = new AudioBuffer({
-                numberOfChannels: numberOfChannels,
-                length: bufferFrames,
-                sampleRate: context.sampleRate
-              });
-
-              src = new AudioBufferSourceNode(context, {buffer: buffer});
-              let counter = new AudioWorkletNode(context, 'counter');
-
-              src.connect(counter).connect(context.destination);
-              src.start();
-            }),
-            'AudioWorklet and graph construction')
-            .beResolved()
-            .then(() => task.done());
+      await context.audioWorklet.addModule(filePath);
+      const buffer = new AudioBuffer({
+        numberOfChannels: numberOfChannels,
+        length: bufferFrames,
+        sampleRate: context.sampleRate
       });
 
-      audit.define('verify count change', (task, should) => {
-        context.startRendering()
-            .then(renderedBuffer => {
-              let output = renderedBuffer.getChannelData(0);
+      const src = new AudioBufferSourceNode(context, {buffer});
+      const counter = new AudioWorkletNode(context, 'counter');
 
-              // Find the first time the number of channels changes to 0.
-              let countChangeIndex = output.findIndex(x => x == 0);
+      src.connect(counter).connect(context.destination);
+      src.start();
+    }, 'Setup graph with AudioWorklet and AudioBufferSourceNode');
 
-              // Verify that the count did change.  If it didn't there's a bug
-              // in the implementation, or it takes longer than the render
-              // length to change.  For the latter case, increase the render
-              // length, but it can't be arbitrarily large.  The change needs to
-              // happen at some reasonable time after the source stops.
-              should(countChangeIndex >= 0, 'Number of channels changed')
-                  .beTrue();
-              should(
-                  countChangeIndex, 'Index where input channel count changed')
-                  .beLessThanOrEqualTo(renderLength);
+    promise_test(async () => {
+      const renderedBuffer = await context.startRendering();
+      const output = renderedBuffer.getChannelData(0);
 
-              // Verify the number of channels at the beginning matches the
-              // number of channels in the AudioBuffer.
-              should(
-                  output.slice(0, countChangeIndex),
-                  `Number of channels in input[0:${countChangeIndex - 1}]`)
-                  .beConstantValueOf(numberOfChannels);
+      // Find the first time the number of channels changes to 0.
+      const countChangeIndex = output.findIndex(x => x == 0);
 
-              // Verify that after the source has stopped, the number of
-              // channels is 0.
-              should(
-                  output.slice(countChangeIndex),
-                  `Number of channels in input[${countChangeIndex}:]`)
-                  .beConstantValueOf(0);
-            })
-            .then(() => task.done());
-      });
+      // Verify that the count did change.  If it didn't there's a bug
+      // in the implementation, or it takes longer than the render
+      // length to change.  For the latter case, increase the render
+      // length, but it can't be arbitrarily large.  The change needs to
+      // happen at some reasonable time after the source stops.
+      assert_greater_than_equal(countChangeIndex, 0,
+          'Number of channels changed');
+      assert_less_than_equal(countChangeIndex, renderLength,
+          'Index where input channel count changed');
 
-      audit.run();
-    </script>
+      // Verify the number of channels at the beginning matches the
+      // number of channels in the AudioBuffer.
+      assert_array_equals(
+          output.slice(0, countChangeIndex),
+          new Float32Array(countChangeIndex).fill(numberOfChannels),
+          `Number of channels in input[0:${countChangeIndex - 1}]`);
 
-  </body>
+      // Verify that after the source has stopped, the number of
+      // channels is 0.
+      assert_array_equals(
+          output.slice(countChangeIndex),
+          new Float32Array(renderLength - countChangeIndex),
+          `Number of channels in input[${countChangeIndex}:]`);
+    }, 'Verify input channel count change after AudioBufferSourceNode stops');
+  </script>
+</body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-channels.html b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-channels.html
index f3f16c4c648..a6aef136284 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-channels.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-channels.html
@@ -1,97 +1,81 @@
 <!DOCTYPE html>
 <html>
-  <head>
-    <title>
-      audiobuffersource-channels.html
-    </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 id="layout-test-code">
-      let audit = Audit.createTaskRunner();
-      let context;
-      let source;
+<head>
+  <title>audiobuffersource-channels.html</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/webaudio/resources/audit-util.js"></script>
+</head>
+<body>
+  <script>
+    test(() => {
+      const context = new AudioContext();
+      const source = new AudioBufferSourceNode(context);
 
-      audit.define(
-          {
-            label: 'validate .buffer',
-            description:
-                'Validatation of AudioBuffer in .buffer attribute setter'
-          },
-          function(task, should) {
-            context = new AudioContext();
-            source = context.createBufferSource();
+      // Make sure we can't set to something which isn't an AudioBuffer.
+      assert_throws_js(TypeError, () => {
+        source.buffer = 57;
+      }, 'source.buffer = 57');
 
-            // Make sure we can't set to something which isn't an AudioBuffer.
-            should(function() {
-              source.buffer = 57;
-            }, 'source.buffer = 57').throw(TypeError);
+      // It's ok to set the buffer to null.
+      source.buffer = null;
 
-            // It's ok to set the buffer to null.
-            should(function() {
-              source.buffer = null;
-            }, 'source.buffer = null').notThrow();
+      // Set the buffer to a valid AudioBuffer
+      const buffer = new AudioBuffer({
+        length: 128,
+        sampleRate: context.sampleRate});
 
-            // Set the buffer to a valid AudioBuffer
-            let buffer =
-                new AudioBuffer({length: 128, sampleRate: context.sampleRate});
+      source.buffer = buffer;
 
-            should(function() {
-              source.buffer = buffer;
-            }, 'source.buffer = buffer').notThrow();
+      // The buffer has been set; we can't set it again.
+      assert_throws_dom('InvalidStateError', () => {
+        source.buffer = new AudioBuffer({
+          length: 128,
+          sampleRate: context.sampleRate});
+      }, 'source.buffer = new buffer');
 
-            // The buffer has been set; we can't set it again.
-            should(function() {
-              source.buffer =
-                  new AudioBuffer({length: 128, sampleRate: context.sampleRate})
-            }, 'source.buffer = new buffer').throw(DOMException, 'InvalidStateError');
+      // The buffer has been set; it's ok to set it to null.
+      source.buffer = null;
 
-            // The buffer has been set; it's ok to set it to null.
-            should(function() {
-              source.buffer = null;
-            }, 'source.buffer = null again').notThrow();
+      // The buffer was already set (and set to null). Can't set it again.
+      assert_throws_dom('InvalidStateError', () => {
+        source.buffer = buffer;
+      }, 'source.buffer = buffer again');
 
-            // The buffer was already set (and set to null).  Can't set it
-            // again.
-            should(function() {
-              source.buffer = buffer;
-            }, 'source.buffer = buffer again').throw(DOMException, 'InvalidStateError');
+      // But setting to null is ok.
+      source.buffer = null;
 
-            // But setting to null is ok.
-            should(function() {
-            }, 'source.buffer = null after setting to null').notThrow();
+      // Check that mono buffer can be set.
+      {
+        const monoBuffer = new AudioBuffer({
+          numberOfChannels: 1,
+          length: 1024,
+          sampleRate: context.sampleRate});
+        const testSource = new AudioBufferSourceNode(context);
+        testSource.buffer = monoBuffer;
+      }
 
-            // Check that mono buffer can be set.
-            should(function() {
-              let monoBuffer =
-                  context.createBuffer(1, 1024, context.sampleRate);
-              let testSource = context.createBufferSource();
-              testSource.buffer = monoBuffer;
-            }, 'Setting source with mono buffer').notThrow();
+      // Check that stereo buffer can be set.
+      {
+        const stereoBuffer = new AudioBuffer({
+          numberOfChannels: 2,
+          length: 1024,
+          sampleRate: context.sampleRate});
+        const testSource = new AudioBufferSourceNode(context);
+        testSource.buffer = stereoBuffer;
+      }
 
-            // Check that stereo buffer can be set.
-            should(function() {
-              let stereoBuffer =
-                  context.createBuffer(2, 1024, context.sampleRate);
-              let testSource = context.createBufferSource();
-              testSource.buffer = stereoBuffer;
-            }, 'Setting source with stereo buffer').notThrow();
-
-            // Check buffers with more than two channels.
-            for (let i = 3; i < 10; ++i) {
-              should(function() {
-                let buffer = context.createBuffer(i, 1024, context.sampleRate);
-                let testSource = context.createBufferSource();
-                testSource.buffer = buffer;
-              }, 'Setting source with ' + i + ' channels buffer').notThrow();
-            }
-            task.done();
-          });
-
-      audit.run();
-    </script>
-  </body>
+      // Check buffers with more than two channels.
+      for (let i = 3; i < 10; ++i) {
+        const buffer = new AudioBuffer({
+          numberOfChannels: i,
+          length: 1024,
+          sampleRate: context.sampleRate});
+        const testSource = new AudioBufferSourceNode(context);
+        testSource.buffer = buffer;
+      }
+    }, 'validate .buffer: Validation of AudioBuffer in ' +
+        '.buffer attribute setter');
+  </script>
+</body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html
index 7b6fbf19775..052afde712d 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html
@@ -30,7 +30,7 @@
         const actual = resultBuffer.getChannelData(0);
         const expected = resultBuffer.getChannelData(1);
 
-        assert_array_approximately_equals(
+        assert_array_equal_within_eps(
             actual,
             expected,
             errorThreshold,
@@ -65,7 +65,7 @@
         const actual = resultBuffer.getChannelData(0);
         const expected = resultBuffer.getChannelData(1);
 
-        assert_array_approximately_equals(
+        assert_array_equal_within_eps(
             actual,
             expected,
             errorThreshold,
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/adding-events.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/adding-events.html
index ab527b6695c..ad4cfc9ce06 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/adding-events.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/adding-events.html
@@ -5,140 +5,142 @@
     <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>
     <script src="/webaudio/resources/audio-param.js"></script>
   </head>
 
   <body>
     <script>
-      let audit = Audit.createTaskRunner();
 
-      // Arbitrary power of two to eliminate round-off in computing time from
-      // frame.
+      // Arbitrary power of two to eliminate round-off in computing time from frame.
       const sampleRate = 8192;
 
-      audit.define(
-          {
-            label: 'linearRamp',
-            description: 'Insert linearRamp after running for some time'
-          },
-          (task, should) => {
-            testInsertion(should, {
-              method: 'linearRampToValueAtTime',
-              prefix: 'linearRamp'
-            }).then(() => task.done());
-          });
-
-      audit.define(
-          {
-            label: 'expoRamp',
-            description: 'Insert expoRamp after running for some time'
-          },
-          (task, should) => {
-            testInsertion(should, {
-              method: 'exponentialRampToValueAtTime',
-              prefix: 'expoRamp'
-            }).then(() => task.done());
-          });
-
       // Test insertion of an event in the middle of rendering.
       //
       // options dictionary:
       //   method - automation method to test
       //   prefix - string to use for prefixing messages
-      function testInsertion(should, options) {
-        let {method, prefix} = options;
+      async function testInsertion(options) {
+        const {method, prefix} = options;
 
         // Channel 0 is the output for the test, and channel 1 is the
         // reference output.
-        let context = new OfflineAudioContext(
-            {numberOfChannels: 2, length: sampleRate, sampleRate: sampleRate});
-        let merger = new ChannelMergerNode(
-            context, {numberOfChannels: context.destination.channelCount});
+        const context = new OfflineAudioContext({
+          numberOfChannels: 2,
+          length: sampleRate,
+          sampleRate: sampleRate
+        });
 
+        const merger = new ChannelMergerNode(
+            context, {numberOfChannels: context.destination.channelCount});
         merger.connect(context.destination);
 
         // Initial value and final values of the source node
-        let initialValue = 1;
-        let finalValue = 2;
+        const initialValue = 1;
+        const finalValue = 2;
 
         // Set up the node for the automations under test
-        let src = new ConstantSourceNode(context, {offset: initialValue});
+        const src = new ConstantSourceNode(context, { offset: initialValue });
         src.connect(merger, 0, 0);
 
         // Set initial event to occur at this time.  Keep it in the first
         // render quantum.
         const initialEventTime = 64 / context.sampleRate;
-        should(
-            () => src.offset.setValueAtTime(initialValue, initialEventTime),
-            `${prefix}: setValueAtTime(${initialValue}, ${initialEventTime})`)
-            .notThrow();
+        // Any exception will naturally fail the test.
+        src.offset.setValueAtTime(initialValue, initialEventTime);
 
         // Let time pass and then add a new event with time in the future.
-        let insertAtFrame = 512;
-        let insertTime = insertAtFrame / context.sampleRate;
-        let automationEndFrame = 1024 + 64;
-        let automationEndTime = automationEndFrame / context.sampleRate;
-        context.suspend(insertTime)
-            .then(() => {
-              should(
-                  () => src.offset[method](finalValue, automationEndTime),
-                  `${prefix}: At time ${insertTime} scheduling ${method}(${
-                      finalValue}, ${automationEndTime})`)
-                  .notThrow();
-            })
-            .then(() => context.resume());
+        const insertAtFrame = 512;
+        const insertTime = insertAtFrame / context.sampleRate;
+        const automationEndFrame = 1024 + 64;
+        const automationEndTime = automationEndFrame / context.sampleRate;
+
+        // Schedule the insertion while rendering is in progress.
+        context.suspend(insertTime).then(() => {
+          src.offset[method](finalValue, automationEndTime);
+          context.resume();
+        });
 
         // Set up graph for the reference result.  Automate the source with
         // the events scheduled from the beginning.  Let the gain node
         // simulate the insertion of the event above.  This is done by
         // setting the gain to 1 at the insertion time.
-        let srcRef = new ConstantSourceNode(context, {offset: 1});
-        let g = new GainNode(context, {gain: 0});
+        const srcRef = new ConstantSourceNode(context, {offset: 1});
+        const g = new GainNode(context, {gain: 0});
         srcRef.connect(g).connect(merger, 0, 1);
         srcRef.offset.setValueAtTime(initialValue, initialEventTime);
         srcRef.offset[method](finalValue, automationEndTime);
 
-        // Allow everything through after |insertFrame| frames.
+        // Allow everything through after |insertAtFrame| frames.
         g.gain.setValueAtTime(1, insertTime);
 
         // Go!
         src.start();
         srcRef.start();
 
-        return context.startRendering().then(audioBuffer => {
-          let actual = audioBuffer.getChannelData(0);
-          let expected = audioBuffer.getChannelData(1);
+        const audioBuffer = await context.startRendering();
 
-          // Verify that the output is 1 until we reach
-          // insertAtFrame. Ignore the expected data because that always
-          // produces 1.
-          should(
-              actual.slice(0, insertAtFrame),
-              `${prefix}: output[0:${insertAtFrame - 1}]`)
-              .beConstantValueOf(initialValue);
+        const actual = audioBuffer.getChannelData(0);
+        const expected = audioBuffer.getChannelData(1);
 
-          // Verify ramp is correct by comparing it to the expected
-          // data.
-          should(
-              actual.slice(
-                  insertAtFrame, automationEndFrame - insertAtFrame + 1),
-              `${prefix}: output[${insertAtFrame}:${
-                  automationEndFrame - insertAtFrame}]`)
-              .beCloseToArray(
-                  expected.slice(
-                      insertAtFrame, automationEndFrame - insertAtFrame + 1),
-                  {absoluteThreshold: 0, numberOfArrayElements: 0});
+        // Verify that the output is 1 until we reach
+        // insertAtFrame. Ignore the expected data because that always
+        // produces 1.
+        {
+          const actualBeforeInsert = actual.slice(0, insertAtFrame);
+          const expectedBeforeInsert = new Float32Array(insertAtFrame);
+          expectedBeforeInsert.fill(initialValue);
+          assert_array_equal_within_eps(
+              actualBeforeInsert,
+              expectedBeforeInsert,
+              0,
+              `${prefix}: output[0:${insertAtFrame - 1}]`);
+        }
 
-          // Verify final output has the expected value
-          should(
-              actual.slice(automationEndFrame),
-              `${prefix}: output[${automationEndFrame}:]`)
-              .beConstantValueOf(finalValue);
-        })
+        // Verify ramp is correct by comparing it to the expected
+        {
+          const rampStart = insertAtFrame;
+          const rampEndInclusive = automationEndFrame;
+          const rampEndExclusive = rampEndInclusive + 1;
+
+          const actualRamp = actual.slice(rampStart, rampEndExclusive);
+          const expectedRamp = expected.slice(rampStart, rampEndExclusive);
+
+          assert_array_equal_within_eps(
+              actualRamp,
+              expectedRamp,
+              {absoluteThreshold: 0},
+              `${prefix}: output[${rampStart}:${rampEndInclusive}]`);
+        }
+
+        // Verify final output has the expected value
+        {
+          const tailStart = automationEndFrame + 1;
+          const actualTail = actual.slice(tailStart);
+          const refTail = new Float32Array(actualTail.length);
+          refTail.fill(finalValue);
+
+          assert_array_equal_within_eps(
+              actualTail,
+              refTail,
+              0,
+              `${prefix}: output[${tailStart}:]`);
+        }
       }
 
-      audit.run();
+      // Define tests (replacing audit.define/audit.run with promise_test)
+      promise_test(async () => {
+        await testInsertion({
+          method: 'linearRampToValueAtTime',
+          prefix: 'linearRamp'
+        });
+      }, 'linearRamp: Insert linearRamp after running for some time');
+
+      promise_test(async () => {
+        await testInsertion({
+          method: 'exponentialRampToValueAtTime',
+          prefix: 'exponentialRamp'
+        });
+      }, 'exponentialRamp: Insert exponentialRamp after running for some time');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/audioparam-connect-audioratesignal.html b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/audioparam-connect-audioratesignal.html
index b0455f86bc0..61990739a79 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/audioparam-connect-audioratesignal.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioparam-interface/audioparam-connect-audioratesignal.html
@@ -16,25 +16,25 @@ to check that the resultant signal should be equal to the gain-scaling curve.
     <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 id="layout-test-code">
-      let audit = Audit.createTaskRunner();
+    <script>
+      const sampleRate = 44100.0;
+      const lengthInSeconds = 1;
 
-      let sampleRate = 44100.0;
-      let lengthInSeconds = 1;
+      let context;
+      let constantOneBuffer;
+      let linearRampBuffer;
 
-      let context = 0;
-      let constantOneBuffer = 0;
-      let linearRampBuffer = 0;
+      function checkResult(renderedBuffer) {
+        const renderedData = renderedBuffer.getChannelData(0);
+        const expectedData = linearRampBuffer.getChannelData(0);
+        const n = renderedBuffer.length;
 
-      function checkResult(renderedBuffer, should) {
-        let renderedData = renderedBuffer.getChannelData(0);
-        let expectedData = linearRampBuffer.getChannelData(0);
-        let n = renderedBuffer.length;
-
-        should(n, 'Rendered signal length').beEqualTo(linearRampBuffer.length);
+        assert_equals(
+            n,
+            linearRampBuffer.length,
+            'Rendered signal length should match control buffer length');
 
         // Check that the rendered result exactly matches the buffer used to
         // control gain.  This is because we're changing the gain of a signal
@@ -47,14 +47,14 @@ to check that the resultant signal should be equal to the gain-scaling curve.
           }
         }
 
-        should(
+        assert_true(
             success,
-            'Rendered signal exactly matches the audio-rate gain changing signal')
-            .beTrue();
+            `Rendered signal exactly matches ` +
+                `the audio-rate gain changing signal`);
       }
 
-      audit.define('test', function(task, should) {
-        let sampleFrameLength = sampleRate * lengthInSeconds;
+      promise_test(async t => {
+        const sampleFrameLength = sampleRate * lengthInSeconds;
 
         // Create offline audio context.
         context = new OfflineAudioContext(1, sampleFrameLength, sampleRate);
@@ -67,37 +67,32 @@ to check that the resultant signal should be equal to the gain-scaling curve.
 
         // Create the two sources.
 
-        let constantSource = context.createBufferSource();
-        constantSource.buffer = constantOneBuffer;
+        const constantSource = new AudioBufferSourceNode(context, {
+          buffer: constantOneBuffer,
+        });
 
-        let gainChangingSource = context.createBufferSource();
-        gainChangingSource.buffer = linearRampBuffer;
+        const gainChangingSource = new AudioBufferSourceNode(context, {
+          buffer: linearRampBuffer,
+        });
 
         // Create a gain node controlling the gain of constantSource and make
         // the connections.
-        let gainNode = context.createGain();
+        const gainNode = new GainNode(context, {gain: 0});
 
-        // Intrinsic baseline gain of zero.
-        gainNode.gain.value = 0;
-
-        constantSource.connect(gainNode);
-        gainNode.connect(context.destination);
+        constantSource.connect(gainNode).connect(context.destination);
 
         // Connect an audio-rate signal to control the .gain AudioParam.
         // This is the heart of what is being tested.
         gainChangingSource.connect(gainNode.gain);
 
         // Start both sources at time 0.
-        constantSource.start(0);
-        gainChangingSource.start(0);
+        constantSource.start();
+        gainChangingSource.start();
 
-        context.startRendering().then(buffer => {
-          checkResult(buffer, should);
-          task.done();
-        });
-      });
-
-      audit.run();
+        const renderedBuffer = await context.startRendering();
+        checkResult(renderedBuffer);
+      }, `AudioParam accepts an audio-rate signal from an AudioNode` +
+          ` and scales a constant source exactly`);
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html b/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html
index 9012526bdc6..73746295805 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/active-processing.https.html
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html>
   <head>
     <title>
@@ -6,88 +6,83 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
 
   <body>
-    <script id="layout-test-code">
+    <script>
       // AudioProcessor that sends a message to its AudioWorkletNode whenver the
       // number of channels on its input changes.
-      let filePath =
+      const filePath =
           '../the-audioworklet-interface/processors/active-processing.js';
 
-      const audit = Audit.createTaskRunner();
-
       let context;
 
-      audit.define('initialize', (task, should) => {
+      // Keep one promise_test to load module
+      // and set up context (so ordering is explicit).
+      promise_test(() => {
         // Create context and load the module
         context = new AudioContext();
-        should(
-            context.audioWorklet.addModule(filePath),
-            'AudioWorklet module loading')
-            .beResolved()
-            .then(() => task.done());
-      });
+        return context.audioWorklet.addModule(filePath);
+      }, 'initialize: AudioWorklet module loading');
 
-      audit.define('test', (task, should) => {
-        const src = new OscillatorNode(context);
+      promise_test(() => {
+        return new Promise(resolve => {
+          const src = new OscillatorNode(context);
 
-        // Number of inputs for the ChannelMergerNode.  Pretty arbitrary, but
-        // should not be 1.
-        const numberOfInputs = 7;
-        const merger =
-            new ChannelMergerNode(context, {numberOfInputs: numberOfInputs});
+          // Number of inputs for the ChannelMergerNode.  Pretty arbitrary, but
+          // should not be 1.
+          const numberOfInputs = 7;
+          const merger =
+              new ChannelMergerNode(context, {numberOfInputs: numberOfInputs});
 
-        const testerNode =
-            new AudioWorkletNode(context, 'active-processing-tester', {
-              // Use as short a duration as possible to keep the test from
-              // taking too much time.
-              processorOptions: {testDuration: .5},
-            });
+          const testerNode =
+              new AudioWorkletNode(context, 'active-processing-tester', {
+                // Use as short a duration as possible to keep the test from
+                // taking too much time.
+                processorOptions: {testDuration: .5},
+              });
 
-        // Expected number of output channels from the merger node.  We should
-        // start with the number of inputs, because the source (oscillator) is
-        // actively processing.  When the source stops, the number of channels
-        // should change to 0.
-        const expectedValues = [numberOfInputs, 0];
-        let index = 0;
+          // Expected number of output channels from the merger node.  We should
+          // start with the number of inputs, because the source (oscillator) is
+          // actively processing.  When the source stops, the number of channels
+          // should change to 0.
+          const expectedValues = [numberOfInputs, 0];
+          let index = 0;
 
-        testerNode.port.onmessage = event => {
-          let count = event.data.channelCount;
-          let finished = event.data.finished;
+          testerNode.port.onmessage = event => {
+            const count = event.data.channelCount;
+            const finished = event.data.finished;
 
-          // If we're finished, end testing.
-          if (finished) {
-            // Verify that we got the expected number of changes.
-            should(index, 'Number of distinct values')
-                .beEqualTo(expectedValues.length);
+            // If we're finished, end testing.
+            if (finished) {
+              // Verify that we got the expected number of changes.
+              assert_equals(
+                  index, expectedValues.length, 'Number of distinct values');
+              resolve();
+              return;
+            }
 
-            task.done();
-            return;
-          }
+            if (index < expectedValues.length) {
+              // Verify that the number of channels matches the expected number
+              // of channels.
+              assert_equals(
+                  count, expectedValues[index],
+                  `Test ${index}: Number of convolver output channels`);
+            }
 
-          if (index < expectedValues.length) {
-            // Verify that the number of channels matches the expected number of
-            // channels.
-            should(count, `Test ${index}: Number of convolver output channels`)
-                .beEqualTo(expectedValues[index]);
-          }
+            ++index;
+          };
 
-          ++index;
-        };
+          // Create the graph and go
+          src.connect(merger).connect(testerNode).connect(context.destination);
+          src.start();
 
-        // Create the graph and go
-        src.connect(merger).connect(testerNode).connect(context.destination);
-        src.start();
-
-        // Stop the source after a short time so we can test that the channel
-        // merger changes to not actively processing and thus produces a single
-        // channel of silence.
-        src.stop(context.currentTime + .1);
-      });
-
-      audit.run();
+          // Stop the source after a short time so we can test that the channel
+          // merger changes to not actively processing and thus produces a
+          // single channel of silence.
+          src.stop(context.currentTime + .1);
+        });
+      }, 'test: Active processing emits expected channel-count changes');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-iirfilternode-interface/iirfilter-getFrequencyResponse.html b/tests/wpt/tests/webaudio/the-audio-api/the-iirfilternode-interface/iirfilter-getFrequencyResponse.html
index eeb4af34f7d..467fe61881c 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-iirfilternode-interface/iirfilter-getFrequencyResponse.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-iirfilternode-interface/iirfilter-getFrequencyResponse.html
@@ -67,12 +67,12 @@
         iir.getFrequencyResponse(frequencies, iirMag, iirPhase);
 
         // Thresholds were experimentally determined.
-        assert_close_to_array(
+        assert_array_equal_within_eps(
             iirMag, trueMag, 2.8611e-6, '1‑pole IIR magnitude response ' +
-            'should be closed to calculated magnitude response');
-        assert_close_to_array(
+                'should be closed to calculated magnitude response');
+        assert_array_equal_within_eps(
             iirPhase, truePhase, 1.7882e-7, '1‑pole IIR phase response ' +
-            ' should be closed to calculated phase response');
+                ' should be closed to calculated phase response');
       }, '1‑pole IIR getFrequencyResponse() matches analytic response');
 
       test(t => {
@@ -101,12 +101,12 @@
         biquad.getFrequencyResponse(frequencies, biquadMag, biquadPhase);
         iir.getFrequencyResponse(frequencies, iirMag, iirPhase);
       // Thresholds were experimentally determined.
-        assert_close_to_array(
+        assert_array_equal_within_eps(
             iirMag, biquadMag, 2.7419e-5, 'IIR magnitude response should be' +
-            'close to Biquad magnitude response');
-        assert_close_to_array(
+                'close to Biquad magnitude response');
+        assert_array_equal_within_eps(
             iirPhase, biquadPhase, 2.7657e-5, 'IIR phase response should be' +
-            'close to Biquad phase response');
+                'close to Biquad phase response');
       }, 'IIR filter equivalent to biquad has matching frequency response');
 
       test(t => {
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/detune-limiting.html b/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/detune-limiting.html
index 8d2ceabac43..e3e6d40ed63 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/detune-limiting.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/detune-limiting.html
@@ -49,7 +49,7 @@
             0,
             `Reference output (freq: ${refOsc.frequency.value}) must be zero`
         );
-        assert_array_approximately_equals(
+        assert_array_equal_within_eps(
             actual,
             expected,
             0,
diff --git a/tests/wpt/tests/webcodecs/videoDecoder-codec-specific.https.any.js b/tests/wpt/tests/webcodecs/videoDecoder-codec-specific.https.any.js
index 21beaa0f4b7..b09ae5bbf6f 100644
--- a/tests/wpt/tests/webcodecs/videoDecoder-codec-specific.https.any.js
+++ b/tests/wpt/tests/webcodecs/videoDecoder-codec-specific.https.any.js
@@ -472,3 +472,24 @@ promise_test(async t => {
   decoder.reset();
   assert_equals(decoder.decodeQueueSize, 0);
 }, 'VideoDecoder decodeQueueSize test');
+
+promise_test(async t => {
+  await checkImplements();
+  const callbacks = {};
+  const decoder = createVideoDecoder(t, callbacks);
+  decoder.configure(CONFIG);
+  decoder.reset();
+  decoder.configure(CONFIG);
+  decoder.decode(CHUNKS[0]);
+
+  let outputs = 0;
+  callbacks.output = frame => {
+    outputs++;
+    assert_equals(frame.timestamp, CHUNKS[0].timestamp, 'timestamp');
+    assert_equals(frame.duration, CHUNKS[0].duration, 'duration');
+    frame.close();
+  };
+
+  await decoder.flush();
+  assert_equals(outputs, 1, 'outputs');
+}, 'Test configure, reset, configure does not stall');
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/locate_nodes/start_nodes.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/locate_nodes/start_nodes.py
index c58c05e1cde..ba530d3a348 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/locate_nodes/start_nodes.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/locate_nodes/start_nodes.py
@@ -304,8 +304,8 @@ async def test_locate_with_document_context_node(bidi_session, inline, top_conte
         "sharedId": any_string,
         "value": {
             "childNodeCount": 1,
-            "localName": "p",
-            "namespaceURI": "http://www.w3.org/1999/xhtml",
+            "localName": "text",
+            "namespaceURI": "http://www.w3.org/2000/svg",
             "nodeType": 1,
         }
     }]),
@@ -314,8 +314,8 @@ async def test_locate_with_document_context_node(bidi_session, inline, top_conte
         "sharedId": any_string,
         "value": {
             "childNodeCount": 1,
-            "localName": "p",
-            "namespaceURI": "http://www.w3.org/1999/xhtml",
+            "localName": "text",
+            "namespaceURI": "http://www.w3.org/2000/svg",
             "nodeType": 1,
         }
     }]),
@@ -325,7 +325,7 @@ async def test_locate_with_svg_context_node(bidi_session, inline, top_context, t
     url = inline("""
       <svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
         <circle aria-label="circle" cx="5" cy="5" r="5" />
-        <p role="banner" aria-label="bar">foo</p>
+        <text role="banner" aria-label="bar">foo</text>
       </svg>
     """)
     await bidi_session.browsing_context.navigate(
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigate/error.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigate/error.py
index c6c32b88dee..d707b3bc462 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigate/error.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigate/error.py
@@ -168,37 +168,6 @@ async def test_with_new_navigation(
         await task
 
 
-async def test_with_new_navigation_inside_page(
-    bidi_session,
-    subscribe_events,
-    inline,
-    new_tab,
-    wait_for_event,
-    wait_for_future_safe,
-):
-    second_url = inline("<div>foo</div>")
-    slow_page_url = inline(
-        f"""
-<!DOCTYPE html>
-<html>
-    <body>
-        <img src="/webdriver/tests/bidi/browsing_context/support/empty.svg?pipe=trickle(d10)" />
-        <script>
-            location.href = "{second_url}"
-        </script>
-        <img src="/webdriver/tests/bidi/browsing_context/support/empty.svg?pipe=trickle(d10)" />
-    </body>
-</html>
-"""
-    )
-
-    # Make sure that the navigation failed.
-    with pytest.raises(UnknownErrorException):
-        await bidi_session.browsing_context.navigate(
-            context=new_tab["context"], url=slow_page_url, wait="complete"
-        )
-
-
 @pytest.mark.parametrize("type_hint", ["tab", "window"])
 async def test_close_context(
     bidi_session,
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
index f3c03917659..e687010128a 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/conftest.py
@@ -8,10 +8,10 @@ LOCALES = ["de-DE", "es-ES", "fr-FR", "it-IT"]
 
 @pytest_asyncio.fixture
 async def get_current_locale(bidi_session):
-    async def get_current_locale(context):
+    async def get_current_locale(context, sandbox=None):
         result = await bidi_session.script.evaluate(
             expression="new Intl.DateTimeFormat().resolvedOptions().locale",
-            target=ContextTarget(context["context"]),
+            target=ContextTarget(context["context"], sandbox=sandbox),
             await_promise=False,
         )
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/contexts.py
index 9f7e01deda3..b2a2ceaecae 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_locale_override/contexts.py
@@ -84,6 +84,10 @@ async def test_iframe(
     # Assert locale is emulated in the iframe context.
     assert await get_current_locale(iframe) == some_locale
 
+    sandbox_name = "test"
+    # Assert locale is emulated in the newly created sandbox in the iframe context.
+    assert await get_current_locale(iframe, sandbox_name) == some_locale
+
     # Set another locale override.
     await bidi_session.emulation.set_locale_override(
         contexts=[new_tab["context"]], locale=another_locale
@@ -91,48 +95,32 @@ async def test_iframe(
 
     # Assert locale is emulated in the iframe context.
     assert await get_current_locale(iframe) == another_locale
+    # Assert locale is emulated in the existing sandbox in the iframe context.
+    assert await get_current_locale(iframe, sandbox_name) == another_locale
 
 
 async def test_locale_override_applies_to_new_sandbox(
-    bidi_session, new_tab, some_locale
+    bidi_session, new_tab, some_locale, get_current_locale
 ):
     await bidi_session.emulation.set_locale_override(
         contexts=[new_tab["context"]], locale=some_locale
     )
 
-    result = await bidi_session.script.evaluate(
-        expression="new Intl.DateTimeFormat().resolvedOptions().locale",
-        target=ContextTarget(new_tab["context"], sandbox="test"),
-        await_promise=False,
-    )
-
     # Make sure the override got applied to the newly created sandbox.
-    assert result["value"] == some_locale
+    assert await get_current_locale(new_tab, "test") == some_locale
 
 
 async def test_locale_override_applies_to_existing_sandbox(
-    bidi_session, new_tab, default_locale, another_locale
+    bidi_session, new_tab, default_locale, another_locale, get_current_locale
 ):
     sandbox_name = "test"
 
     # Create a sandbox.
-    result = await bidi_session.script.evaluate(
-        expression="new Intl.DateTimeFormat().resolvedOptions().locale",
-        target=ContextTarget(new_tab["context"], sandbox=sandbox_name),
-        await_promise=False,
-    )
-
-    assert result["value"] == default_locale
+    assert await get_current_locale(new_tab, sandbox_name) == default_locale
 
     await bidi_session.emulation.set_locale_override(
         contexts=[new_tab["context"]], locale=another_locale
     )
 
-    result = await bidi_session.script.evaluate(
-        expression="new Intl.DateTimeFormat().resolvedOptions().locale",
-        target=ContextTarget(new_tab["context"], sandbox=sandbox_name),
-        await_promise=False,
-    )
-
     # Make sure the override got applied to the existing sandbox.
-    assert result["value"] == another_locale
+    assert await get_current_locale(new_tab, sandbox_name) == another_locale
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/conftest.py
index a30145bf84e..aff708ddff8 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/conftest.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/conftest.py
@@ -8,11 +8,12 @@ from ... import remote_mapping_to_dict
 
 @pytest_asyncio.fixture
 async def get_screen_orientation(bidi_session):
-    async def get_screen_orientation(context):
+    async def get_screen_orientation(context, top_context=None):
         # Activation is required, as orientation is only available on an active
         # context.
-        await bidi_session.browsing_context.activate(context=context["context"])
-
+        await bidi_session.browsing_context.activate(
+            context=top_context["context"] if top_context else context["context"]
+        )
         result = await bidi_session.script.evaluate(
             expression="""({
                     angle: screen.orientation.angle,
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/contexts.py
index d91b4dc185e..df24e9a2b68 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/contexts.py
@@ -67,3 +67,55 @@ async def test_multiple_contexts(
     assert await get_screen_orientation(new_tab) == default_screen_orientation
     assert await get_screen_orientation(
         top_context) == default_screen_orientation
+
+
+@pytest.mark.parametrize("domain", ["", "alt"], ids=["same_origin", "cross_origin"])
+async def test_iframe(
+    bidi_session,
+    new_tab,
+    get_screen_orientation,
+    some_bidi_screen_orientation,
+    some_web_screen_orientation,
+    another_bidi_screen_orientation,
+    another_web_screen_orientation,
+    inline,
+    domain,
+):
+    await bidi_session.emulation.set_screen_orientation_override(
+        contexts=[new_tab["context"]],
+        screen_orientation=some_bidi_screen_orientation,
+    )
+
+    # Assert screen orientation in the required context.
+    assert await get_screen_orientation(new_tab) == some_web_screen_orientation
+
+    iframe_url = inline("<div id='in-iframe'>foo</div>", domain=domain)
+    page_url = inline(f"<iframe src='{iframe_url}'></iframe>")
+
+    # Load the page with iframes.
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"],
+        url=page_url,
+        wait="complete",
+    )
+
+    contexts = await bidi_session.browsing_context.get_tree(root=new_tab["context"])
+    iframe = contexts[0]["children"][0]
+
+    # Assert locale is emulated in the iframe context.
+    assert (
+        await get_screen_orientation(iframe, top_context=new_tab)
+        == some_web_screen_orientation
+    )
+
+    # Set another screen orientation override.
+    await bidi_session.emulation.set_screen_orientation_override(
+        contexts=[new_tab["context"]],
+        screen_orientation=another_bidi_screen_orientation,
+    )
+
+    # Assert screen orientation is emulated in the iframe context.
+    assert (
+        await get_screen_orientation(iframe, top_context=new_tab)
+        == another_web_screen_orientation
+    )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/screen_orientation.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/screen_orientation.py
index d538e9d0a2a..09309a73626 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/screen_orientation.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_screen_orientation_override/screen_orientation.py
@@ -1,6 +1,7 @@
 import pytest
 
 from . import get_angle
+from ... import remote_mapping_to_dict
 
 pytestmark = pytest.mark.asyncio
 
@@ -32,3 +33,76 @@ async def test_screen_orientation(bidi_session, top_context,
     # Assert screen orientation is the default.
     assert await get_screen_orientation(
         top_context) == default_screen_orientation
+
+
+async def test_screen_orientation_change_event(
+    bidi_session,
+    new_tab,
+    some_bidi_screen_orientation,
+    some_web_screen_orientation,
+    another_bidi_screen_orientation,
+    another_web_screen_orientation,
+    default_screen_orientation,
+    subscribe_events,
+    add_preload_script,
+    wait_for_event,
+    wait_for_future_safe,
+    inline,
+):
+    await subscribe_events(["script.message"])
+    await add_preload_script(
+        function_declaration="""(channel) => {
+            window.screen.orientation.addEventListener(
+                "change",
+                (e)=>channel({type: e.target.type, angle: e.target.angle})
+            )
+        }""",
+        arguments=[{"type": "channel", "value": {"channel": "change_event"}}],
+    )
+
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"], url=inline("<div>foo</div>"), wait="complete"
+    )
+
+    on_script_message = wait_for_event("script.message")
+
+    # Set screen orientation override.
+    await bidi_session.emulation.set_screen_orientation_override(
+        contexts=[new_tab["context"]], screen_orientation=some_bidi_screen_orientation
+    )
+
+    event_data = await wait_for_future_safe(on_script_message)
+
+    assert (
+        remote_mapping_to_dict(event_data["data"]["value"])
+        == some_web_screen_orientation
+    )
+
+    on_script_message = wait_for_event("script.message")
+
+    # Set another screen orientation override.
+    await bidi_session.emulation.set_screen_orientation_override(
+        contexts=[new_tab["context"]],
+        screen_orientation=another_bidi_screen_orientation,
+    )
+
+    event_data = await wait_for_future_safe(on_script_message)
+
+    assert (
+        remote_mapping_to_dict(event_data["data"]["value"])
+        == another_web_screen_orientation
+    )
+
+    on_script_message = wait_for_event("script.message")
+
+    # Reset screen orientation override.
+    await bidi_session.emulation.set_screen_orientation_override(
+        contexts=[new_tab["context"]], screen_orientation=None
+    )
+
+    event_data = await wait_for_future_safe(on_script_message)
+
+    assert (
+        remote_mapping_to_dict(event_data["data"]["value"])
+        == default_screen_orientation
+    )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_timezone_override/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_timezone_override/contexts.py
index 6f90a9d3040..c71d9936d94 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_timezone_override/contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_timezone_override/contexts.py
@@ -86,6 +86,10 @@ async def test_iframe(
     # Assert timezone is emulated in the iframe context.
     assert await get_current_timezone(iframe) == some_timezone
 
+    sandbox_name = "test"
+    # Assert timezone is emulated in the newly created sandbox in the iframe context.
+    assert await get_current_timezone(iframe, sandbox_name) == some_timezone
+
     # Set another timezone override.
     await bidi_session.emulation.set_timezone_override(
         contexts=[new_tab["context"]], timezone=another_timezone
@@ -93,6 +97,8 @@ async def test_iframe(
 
     # Assert timezone is emulated in the iframe context.
     assert await get_current_timezone(iframe) == another_timezone
+    # Assert timezone is emulated in the existing sandbox in the iframe context.
+    assert await get_current_timezone(iframe, sandbox_name) == another_timezone
 
 
 async def test_timezone_override_applies_to_new_sandbox(
diff --git a/tests/wpt/tests/webdriver/tests/bidi/integration/parallel_execution/browsing_context_print.py b/tests/wpt/tests/webdriver/tests/bidi/integration/parallel_execution/browsing_context_print.py
index 65bb73c254f..429a4c6417b 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/integration/parallel_execution/browsing_context_print.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/integration/parallel_execution/browsing_context_print.py
@@ -10,7 +10,7 @@ async def test_when_browsingcontext_recreated(
 ):
     new_tab = await bidi_session.browsing_context.create(type_hint="tab")
 
-    page = inline("<div>foo</div>")
+    page = inline("""<div style="margin-top: 10000px;">foo</div>""")
     await bidi_session.browsing_context.navigate(
         context=new_tab["context"], url=page, wait="complete"
     )
diff --git a/tests/wpt/tests/webdriver/tests/classic/element_clear/scroll_into_view.py b/tests/wpt/tests/webdriver/tests/classic/element_clear/scroll_into_view.py
new file mode 100644
index 00000000000..3409eb6aa79
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/classic/element_clear/scroll_into_view.py
@@ -0,0 +1,36 @@
+import pytest
+
+from tests.support.asserts import assert_success
+from tests.support.helpers import is_element_in_viewport
+
+from . import element_clear
+
+
+def test_scroll_into_view(session, inline):
+    session.url = inline("""
+        <style>
+            .scroll-container {
+                display: block;
+                overflow-y: scroll;
+                scroll-behavior: smooth;
+                height: 200px;
+            }
+
+            input {
+                margin-top: 2000vh;
+            }
+        </style>
+
+        <div class="scroll-container">
+            <input type="text" size="20" value="foo"></input>
+        </div>
+        """)
+
+    element = session.find.css("input", all=False)
+    response = element_clear(session, element)
+    assert_success(response)
+
+    assert is_element_in_viewport(session, element)
+
+    assert element.property("value") == ""
+
diff --git a/tests/wpt/tests/webdriver/tests/classic/element_click/scroll_into_view.py b/tests/wpt/tests/webdriver/tests/classic/element_click/scroll_into_view.py
index 1b9c671efab..6c3d26611d3 100644
--- a/tests/wpt/tests/webdriver/tests/classic/element_click/scroll_into_view.py
+++ b/tests/wpt/tests/webdriver/tests/classic/element_click/scroll_into_view.py
@@ -6,16 +6,18 @@ from tests.support.helpers import center_point
 
 def element_click(session, element):
     return session.transport.send(
-        "POST", "session/{session_id}/element/{element_id}/click".format(
-            session_id=session.session_id,
-            element_id=element.id))
+        "POST",
+        "session/{session_id}/element/{element_id}/click".format(
+            session_id=session.session_id, element_id=element.id
+        ),
+    )
 
 
 def assert_one_click(session):
     """Asserts there has only been one click, and returns that."""
     clicks = session.execute_script("return window.clicks")
     assert len(clicks) == 1
-    return tuple(clicks[0])
+    return clicks[0]
 
 
 def test_scroll_into_view(session, inline):
@@ -27,57 +29,120 @@ def test_scroll_into_view(session, inline):
 
     session.window_handle = new_handle
 
-    session.url = inline("""
-        <input type=text value=Federer
-        style="position: absolute; left: 0vh; top: 500vh">""")
+    session.url = inline(
+        """
+        <style>
+            .scroll-container {
+                display: block;
+                overflow-y: scroll;
+                scroll-behavior: smooth;
+                height: 200px;
+            }
+
+            input {
+                margin-top: 2000vh;
+            }
+        </style>
+
+        <div class="scroll-container">
+            <input type="text" size="20" value="foo"></input>
+        </div>
+
+        <script>
+            window.clicks = [];
+            const target = document.querySelector("input");
+            target.addEventListener("click", function(e) {
+                window.clicks.push({
+                    "target": e.target,
+                    "clientX": e.clientX,
+                    "clientY": e.clientY,
+                });
+            });
+        </script>
+        """
+    )
 
     element = session.find.css("input", all=False)
     response = element_click(session, element)
     assert_success(response)
 
+    event_data = assert_one_click(session)
+    assert event_data["target"] == element
+
     # Check if element clicked is scrolled into view
-    assert session.execute_script("""
+    assert (
+        session.execute_script(
+            """
         let input = arguments[0];
         rect = input.getBoundingClientRect();
         return rect.top >= 0 && rect.left >= 0 &&
             Math.floor(rect.bottom) <= window.innerHeight &&
             Math.floor(rect.right) <= window.innerWidth;
-            """, args=(element,)) is True
+            """,
+            args=(element,),
+        )
+        is True
+    )
 
     session.window.close()
 
     session.window_handle = original_handle
 
+
 @pytest.mark.parametrize("offset", range(9, 0, -1))
 def test_partially_visible_does_not_scroll(session, offset, inline):
-    session.url = inline("""
+    session.url = inline(
+        f"""
         <style>
         body {{
-          margin: 0;
-          padding: 0;
+            margin: 0;
+            padding: 0;
         }}
 
         div {{
-          background: blue;
-          height: 200px;
+            background: blue;
+            height: 200px;
 
-          /* make N pixels visible in the viewport */
-          margin-top: calc(100vh - {offset}px);
+            /* make N pixels visible in the viewport */
+            margin-top: calc(100vh - {offset}px);
         }}
         </style>
 
         <div></div>
 
         <script>
-        window.clicks = [];
-        let target = document.querySelector("div");
-        target.addEventListener("click", function(e) {{ window.clicks.push([e.clientX, e.clientY]); }});
+            window.clicks = [];
+            const target = document.querySelector("div");
+            target.addEventListener("click", function(e) {{
+                window.clicks.push({{
+                    "target": e.target,
+                    "clientX": e.clientX,
+                    "clientY": e.clientY,
+                }});
+            }});
         </script>
-        """.format(offset=offset))
-    target = session.find.css("div", all=False)
-    assert session.execute_script("return window.scrollY || document.documentElement.scrollTop") == 0
-    response = element_click(session, target)
+        """
+    )
+
+    assert (
+        session.execute_script(
+            "return window.scrollY || document.documentElement.scrollTop"
+        )
+        == 0
+    )
+
+    element = session.find.css("div", all=False)
+    response = element_click(session, element)
     assert_success(response)
-    assert session.execute_script("return window.scrollY || document.documentElement.scrollTop") == 0
-    click_point = assert_one_click(session)
-    assert click_point == pytest.approx(center_point(target), abs=1.0)
+
+    assert (
+        session.execute_script(
+            "return window.scrollY || document.documentElement.scrollTop"
+        )
+        == 0
+    )
+
+    event_data = assert_one_click(session)
+    assert (event_data["clientX"], event_data["clientY"]) == pytest.approx(
+        center_point(element), abs=1.0
+    )
diff --git a/tests/wpt/tests/webdriver/tests/classic/element_send_keys/scroll_into_view.py b/tests/wpt/tests/webdriver/tests/classic/element_send_keys/scroll_into_view.py
index af20211251a..6d1c37f8d51 100644
--- a/tests/wpt/tests/webdriver/tests/classic/element_send_keys/scroll_into_view.py
+++ b/tests/wpt/tests/webdriver/tests/classic/element_send_keys/scroll_into_view.py
@@ -31,14 +31,33 @@ def test_element_outside_of_not_scrollable_viewport(session, inline):
 
 
 def test_element_outside_of_scrollable_viewport(session, inline):
-    session.url = inline('<input style="margin-top: 102vh;">')
-    element = session.find.css("input", all=False)
+    session.url = inline("""
+        <style>
+            .scroll-container {
+                display: block;
+                overflow-y: scroll;
+                scroll-behavior: smooth;
+                height: 200px;
+            }
 
-    response = element_send_keys(session, element, "foo")
+            input {
+                margin-top: 2000vh;
+            }
+        </style>
+
+        <div class="scroll-container">
+            <input type="text" size="20" value="foo"></input>
+        </div>
+        """)
+
+    element = session.find.css("input", all=False)
+    response = element_send_keys(session, element, " bar")
     assert_success(response)
 
     assert is_element_in_viewport(session, element)
 
+    assert element.property("value") == "foo bar"
+
 
 def test_contenteditable_element_outside_of_scrollable_viewport(session, inline):
     session.url = inline('<div contenteditable style="margin-top: 102vh;"></div>')
diff --git a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/__init__.py b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/__init__.py
index 9a82cc48eab..9e9a5599ed3 100644
--- a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/__init__.py
@@ -8,3 +8,13 @@ def element_dimensions(session, element):
           Math.floor(height * devicePixelRatio),
         ];
         """, args=(element,)))
+
+
+def take_element_screenshot(session, element_id):
+    return session.transport.send(
+        "GET",
+        "session/{session_id}/element/{element_id}/screenshot".format(
+            session_id=session.session_id,
+            element_id=element_id,
+        )
+    )
diff --git a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/iframe.py b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/iframe.py
index e7f1b0c8053..0262fa8b1d3 100644
--- a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/iframe.py
+++ b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/iframe.py
@@ -3,7 +3,7 @@ import pytest
 from tests.support.asserts import assert_success
 from tests.support.image import png_dimensions
 
-from . import element_dimensions
+from . import element_dimensions, take_element_screenshot
 
 DEFAULT_CONTENT = "<div id='content'>Lorem ipsum dolor sit amet.</div>"
 
@@ -57,16 +57,6 @@ INNER_IFRAME_STYLE = """
 """
 
 
-def take_element_screenshot(session, element_id):
-    return session.transport.send(
-        "GET",
-        "session/{session_id}/element/{element_id}/screenshot".format(
-            session_id=session.session_id,
-            element_id=element_id,
-        )
-    )
-
-
 def test_frame_element(session, inline, iframe):
     # Create a reference element which looks exactly like the frame's content
     session.url = inline("{0}{1}".format(REFERENCE_STYLE, REFERENCE_CONTENT))
diff --git a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/screenshot.py b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/screenshot.py
index fdc0d65b1d9..1fe82d47467 100644
--- a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/screenshot.py
+++ b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/screenshot.py
@@ -4,17 +4,7 @@ from webdriver import WebElement
 
 from tests.support.asserts import assert_error, assert_success
 from tests.support.image import png_dimensions
-from . import element_dimensions
-
-
-def take_element_screenshot(session, element_id):
-    return session.transport.send(
-        "GET",
-        "session/{session_id}/element/{element_id}/screenshot".format(
-            session_id=session.session_id,
-            element_id=element_id,
-        )
-    )
+from . import element_dimensions, take_element_screenshot
 
 
 def test_no_top_browsing_context(session, closed_window):
diff --git a/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py
new file mode 100644
index 00000000000..42249c90ac8
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/classic/take_element_screenshot/scroll_into_view.py
@@ -0,0 +1,40 @@
+import pytest
+
+from tests.support.asserts import assert_success
+from tests.support.helpers import is_element_in_viewport
+
+from . import take_element_screenshot
+
+
+def test_scroll_into_view(session, inline):
+    session.url = inline("""
+        <style>
+            .scroll-container {
+                display: block;
+                overflow-y: scroll;
+                scroll-behavior: smooth;
+                height: 200px;
+            }
+
+            input {
+                margin-top: 2000vh;
+            }
+        </style>
+
+        <input id="reference" type="text" size="20" value="foo"></input>
+        <div class="scroll-container">
+            <input id="target" type="text" size="20" value="foo"></input>
+        </div>
+        """)
+
+    reference = session.find.css("#reference", all=False)
+    response = take_element_screenshot(session, reference.id)
+    reference_screenshot = assert_success(response)
+
+    element = session.find.css("#target", all=False)
+    response = take_element_screenshot(session, element.id)
+    screenshot = assert_success(response)
+
+    assert is_element_in_viewport(session, element)
+
+    assert screenshot == reference_screenshot
diff --git a/tests/wpt/tests/webgpu/WEB_FEATURES.yml b/tests/wpt/tests/webgpu/WEB_FEATURES.yml
new file mode 100644
index 00000000000..c2f16d88c6b
--- /dev/null
+++ b/tests/wpt/tests/webgpu/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: webgpu
+  files: "**"
diff --git a/tests/wpt/tests/webnn/WEB_FEATURES.yml b/tests/wpt/tests/webnn/WEB_FEATURES.yml
new file mode 100644
index 00000000000..f747ef978f1
--- /dev/null
+++ b/tests/wpt/tests/webnn/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: webnn
+  files: "**"
diff --git a/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js b/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
index 4b6a4ab8e7f..4c895b98157 100644
--- a/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
+++ b/tests/wpt/tests/webnn/conformance_tests/tensor.https.any.js
@@ -1401,11 +1401,12 @@ const testExportToGPU = (testName) => {
 
     // Check if WebNN interop is supported.
     try {
-      await mlContext.createTensor({
+      let mlTensor = await mlContext.createTensor({
         dataType: 'float32',
         shape: shape,
         exportableToGPU: true,
       });
+      await mlContext.exportToGPU(mlTensor);
     } catch (e) {
       if (e.name === 'NotSupportedError') {
         isExportToGPUSupported = false;
diff --git a/tests/wpt/tests/webrtc-stats/WEB_FEATURES.yml b/tests/wpt/tests/webrtc-stats/WEB_FEATURES.yml
new file mode 100644
index 00000000000..0be5cb8425c
--- /dev/null
+++ b/tests/wpt/tests/webrtc-stats/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: webrtc-stats
+  files: "**"
diff --git a/tests/wpt/tests/webrtc/RTCDataChannel-send.html b/tests/wpt/tests/webrtc/RTCDataChannel-send.html
index 69bdf9dbe62..bc93edce697 100644
--- a/tests/wpt/tests/webrtc/RTCDataChannel-send.html
+++ b/tests/wpt/tests/webrtc/RTCDataChannel-send.html
@@ -5,6 +5,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="RTCPeerConnection-helper.js"></script>
+<script src="RTCDataChannel-helper.js"></script>
 <script src="third_party/sdp/sdp.js"></script>
 <script>
 'use strict';
@@ -428,5 +429,50 @@ for (const options of [{}, {negotiated: true, id: 0}]) {
     await receivedMessages;
   }, `Sending multiple messages simultaneously in unordered mode works reliably`);
 
+promise_test(async () => {
+  const offerer = new RTCPeerConnection();
+  const answerer = new RTCPeerConnection();
+  const channel1 = offerer.createDataChannel('foo');
+
+  const toSend = [];
+  for (let i = 0; i < 100; i++) {
+    toSend.push(`So anyway I started blastin' ${i}`);
+  }
+
+  function blastMessages(channel) {
+    assert_equals(channel.readyState, 'open', 'channel should already be open');
+    for (const message of toSend) {
+      channel.send(message);
+    }
+  }
+
+  // Set up both channels to send messages as soon as they are open
+  channel1.onopen = () => blastMessages(channel1);
+
+  const channel2Created = new Promise(r => {
+    answerer.ondatachannel = ({channel}) => {
+      blastMessages(channel);
+      r(channel);
+    }
+  });
+
+  async function receiveMessages(channel) {
+    const received = [];
+    while (received.length < toSend.length) {
+      const {data} = await new Promise(r => channel.onmessage = r);
+      received.push(data);
+    }
+    return received;
+  }
+
+  const received1 = receiveMessages(channel1);
+
+  await negotiate(offerer, answerer);
+
+  const channel2 = await channel2Created;
+  assert_array_equals(await receiveMessages(channel2), toSend);
+  assert_array_equals(await received1, toSend);
+}, 'Sending before the other side is open should work');
+
 
 </script>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute-ref.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute-ref.html
new file mode 100644
index 00000000000..82af621e457
--- /dev/null
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Reference for WebVTT rendering, ::cue([lang=])</title>
+<style>
+html { overflow:hidden }
+body { margin:0 }
+.video {
+    display: inline-block;
+    width: 320px;
+    height: 180px;
+    position: relative;
+    font-size: 9px;
+}
+.cue {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    text-align: center;
+    font-family: sans-serif;
+    color: #00ff00;
+}
+.cue > span {
+    background: rgba(0,0,0,0.8);
+}
+.cue > span > span {
+    color: #0000ff;
+}
+</style>
+<div class="video"><span class="cue"><span>Deutsch<span>English</span></span></span></div>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute.html
new file mode 100644
index 00000000000..8ee3a551eb3
--- /dev/null
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>WebVTT rendering, ::cue([lang=])</title>
+<link rel="match" href="lang_attribute-ref.html">
+<style>
+html { overflow:hidden }
+body { margin:0 }
+::cue([lang="en"]) {
+    font-family: sans-serif;
+    color: #0000ff;
+}
+::cue([lang="de"]) {
+    font-family: sans-serif;
+    color: #00ff00;
+}
+</style>
+<script src="/common/reftest-wait.js"></script>
+<video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
+    <source src="/media/white.webm" type="video/webm">
+    <source src="/media/white.mp4" type="video/mp4">
+    <track src="../../../support/test_lang_object.vtt" srclang="de" default>
+    <script>
+    document.getElementsByTagName('track')[0].track.mode = 'showing';
+    </script>
+</video>
+</html>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color-ref.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color-ref.html
new file mode 100644
index 00000000000..957df145fb3
--- /dev/null
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Reference for WebVTT rendering, ::cue(lang), color: #0000ff</title>
+<style>
+html { overflow:hidden }
+body { margin:0 }
+.video {
+    display: inline-block;
+    width: 320px;
+    height: 180px;
+    position: relative;
+    font-size: 9px;
+}
+.cue {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    text-align: center;
+    font-family: sans-serif;
+    color: white;
+}
+.cue > span {
+    background: rgba(0,0,0,0.8);
+}
+.cue > span > span {
+    color: #0000ff;
+}
+</style>
+<div class="video"><span class="cue"><span>Deutsch<span>English</span></span></span></div>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color.html
new file mode 100644
index 00000000000..de0c838065a
--- /dev/null
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>WebVTT rendering, ::cue(lang), color: #0000ff</title>
+<link rel="match" href="lang_color-ref.html">
+<style>
+html { overflow:hidden }
+body { margin:0 }
+::cue(lang) {
+    font-family: sans-serif;
+    color: #0000ff;
+}
+</style>
+<script src="/common/reftest-wait.js"></script>
+<video width="320" height="180" autoplay onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
+    <source src="/media/white.webm" type="video/webm">
+    <source src="/media/white.mp4" type="video/mp4">
+    <track src="../../../support/test_lang_object.vtt">
+    <script>
+    document.getElementsByTagName('track')[0].track.mode = 'showing';
+    </script>
+</video>
+</html>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/support/test_lang_object.vtt b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/support/test_lang_object.vtt
new file mode 100644
index 00000000000..957c7a906b4
--- /dev/null
+++ b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/support/test_lang_object.vtt
@@ -0,0 +1,4 @@
+WEBVTT
+
+00:00:00.000 --> 00:00:05.000
+Deutsch<lang en>English</lang>
\ No newline at end of file
diff --git a/tests/wpt/tests/window-management/WEB_FEATURES.yml b/tests/wpt/tests/window-management/WEB_FEATURES.yml
new file mode 100644
index 00000000000..efaa052f5da
--- /dev/null
+++ b/tests/wpt/tests/window-management/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: window-management
+  files: "**"