diff --git a/tests/wpt/meta/FileAPI/blob/Blob-slice.any.js.ini b/tests/wpt/meta/FileAPI/blob/Blob-slice.any.js.ini
new file mode 100644
index 00000000000..75233515aaf
--- /dev/null
+++ b/tests/wpt/meta/FileAPI/blob/Blob-slice.any.js.ini
@@ -0,0 +1,38 @@
+[Blob-slice.any.html]
+  [Slicing test: slice (1,1).]
+    expected: FAIL
+
+  [Slicing test: slice (1,3).]
+    expected: FAIL
+
+  [Slicing test: slice (1,5).]
+    expected: FAIL
+
+  [Slicing test: slice (1,7).]
+    expected: FAIL
+
+  [Slicing test: slice (1,8).]
+    expected: FAIL
+
+  [Slicing test: slice (1,9).]
+    expected: FAIL
+
+
+[Blob-slice.any.worker.html]
+  [Slicing test: slice (1,1).]
+    expected: FAIL
+
+  [Slicing test: slice (1,3).]
+    expected: FAIL
+
+  [Slicing test: slice (1,5).]
+    expected: FAIL
+
+  [Slicing test: slice (1,7).]
+    expected: FAIL
+
+  [Slicing test: slice (1,8).]
+    expected: FAIL
+
+  [Slicing test: slice (1,9).]
+    expected: FAIL
diff --git a/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
index b275cb58343..292dc852b9f 100644
--- a/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/meta/FileAPI/url/url-with-fetch.any.js.ini
@@ -12,6 +12,3 @@
 
   [Revoke blob URL after creating Request, then clone Request, will fetch]
     expected: FAIL
-
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
diff --git a/tests/wpt/meta/IndexedDB/idlharness.any.js.ini b/tests/wpt/meta/IndexedDB/idlharness.any.js.ini
index 3dd6edbf07b..6ea65643ea2 100644
--- a/tests/wpt/meta/IndexedDB/idlharness.any.js.ini
+++ b/tests/wpt/meta/IndexedDB/idlharness.any.js.ini
@@ -134,6 +134,39 @@
   [IDBFactory interface: [object IDBFactory\] must inherit property "databases()" with the proper type]
     expected: FAIL
 
+  [IDBObjectStore interface: operation getAllRecords(optional IDBGetAllOptions)]
+    expected: FAIL
+
+  [IDBIndex interface: operation getAllRecords(optional IDBGetAllOptions)]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface object]
+    expected: FAIL
+
+  [IDBRecord interface object length]
+    expected: FAIL
+
+  [IDBRecord interface object name]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [IDBRecord interface: attribute key]
+    expected: FAIL
+
+  [IDBRecord interface: attribute primaryKey]
+    expected: FAIL
+
+  [IDBRecord interface: attribute value]
+    expected: FAIL
+
 
 [idlharness.any.serviceworker.html]
   expected: ERROR
@@ -270,3 +303,36 @@
 
   [IDBFactory interface: [object IDBFactory\] must inherit property "databases()" with the proper type]
     expected: FAIL
+
+  [IDBObjectStore interface: operation getAllRecords(optional IDBGetAllOptions)]
+    expected: FAIL
+
+  [IDBIndex interface: operation getAllRecords(optional IDBGetAllOptions)]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface object]
+    expected: FAIL
+
+  [IDBRecord interface object length]
+    expected: FAIL
+
+  [IDBRecord interface object name]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [IDBRecord interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [IDBRecord interface: attribute key]
+    expected: FAIL
+
+  [IDBRecord interface: attribute primaryKey]
+    expected: FAIL
+
+  [IDBRecord interface: attribute value]
+    expected: FAIL
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 fc97f7777cf..0343219909b 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -1906,6 +1906,13 @@
          {}
         ]
        ],
+       "chrome-bug-439886903-crash.html": [
+        "a32a38925d1d0f4a9467589791c18974cf219959",
+        [
+         null,
+         {}
+        ]
+       ],
        "chrome-custom-highlight-crash.html": [
         "61e5075ed4e1b485019d96b402bbf17926bd1098",
         [
@@ -3098,6 +3105,17 @@
       }
      }
     },
+    "css-highlight-api": {
+     "crashtests": {
+      "highlight-first-letter-float-crash.html": [
+       "ea3742954966931f3d42c075678ad6fdc35bb78a",
+       [
+        null,
+        {}
+       ]
+      ]
+     }
+    },
     "css-images": {
      "cross-fade-legacy-2-crash.html": [
       "37321f88c1671de236e48341f14366e744c63f34",
@@ -8328,6 +8346,20 @@
         {}
        ]
       ],
+      "firefox-bug-1928736-1-crash.html": [
+       "498a4906398f7816cf66f383948eb9f68b8cf9b2",
+       [
+        null,
+        {}
+       ]
+      ],
+      "firefox-bug-1928736-2-crash.html": [
+       "d26844eb3f7c684bc6067a9ca8458dbc0c2b8cd5",
+       [
+        null,
+        {}
+       ]
+      ],
       "two-summaries-removal-crash.html": [
        "164d3f16aa65deb97826607e2f57c33dcaa0f9b0",
        [
@@ -24260,6 +24292,13 @@
          {}
         ]
        ],
+       "dragdrop-text-elements-input-event-manual.html": [
+        "4c65e663666c6e74d86189905340fa8915fd2c52",
+        [
+         null,
+         {}
+        ]
+       ],
        "dragend-event-manual.html": [
         "b4bb621e888d5a632fe0ff35e95036d5634e41db",
         [
@@ -24918,6 +24957,17 @@
         ]
        ]
       }
+     },
+     "editing-0": {
+      "contenteditable": {
+       "spellcheck-insertReplacementText-input-event-manual.html": [
+        "61736269634fc7135a09529f364de9457b6d9c11",
+        [
+         null,
+         {}
+        ]
+       ]
+      }
      }
     },
     "links": {
@@ -124699,7 +124749,7 @@
        ]
       ],
       "mix-blend-mode-both-parent-and-blended-with-3D-transform.html": [
-       "59fca74f8409f7288ff64f0828cb6c1c417e2a97",
+       "f634dd7fd99857c6529fdd7c5441beab03c629a9",
        [
         null,
         [
@@ -124715,7 +124765,7 @@
            [
             [
              0,
-             128
+             180
             ],
             [
              0,
@@ -126993,12 +127043,12 @@
       ]
      ],
      "anchor-scroll-to-sticky-003.html": [
-      "ac5e1c3c692e6eaa93789bd8145fb27bbe61d916",
+      "395d736afb47d34680470103a2660fadccce8851",
       [
        null,
        [
         [
-         "/css/css-anchor-position/reference/anchor-scroll-to-sticky-001-ref.html",
+         "/css/css-anchor-position/reference/anchor-scroll-to-sticky-003-ref.html",
          "=="
         ]
        ],
@@ -127930,6 +127980,19 @@
        {}
       ]
      ],
+     "animation-duration-infinite.html": [
+      "cfe6dc0bcf4f946832b82c4a838844498be2cc22",
+      [
+       null,
+       [
+        [
+         "/css/css-animations/animation-duration-infinite-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "animation-important-002.html": [
       "2a68f8e0cacf06e2e5761ef392b90a4f89fcc843",
       [
@@ -138171,7 +138234,7 @@
       ]
      ],
      "table-cell-background-local-003.html": [
-      "5641d3d41c0a8770feb120f2898df5262688ca6a",
+      "e2662bec1fa75049c07cbc07c24449e37c4c56a7",
       [
        null,
        [
@@ -138180,23 +138243,7 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            1
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "table-cell-background-local.html": [
@@ -150954,6 +151001,19 @@
          {}
         ]
        ],
+       "text-in-nested-multicol.html": [
+        "e1eb6f9c19ab8398d14f0ed545e40dad05452499",
+        [
+         null,
+         [
+          [
+           "/css/css-break/table/repeated-section/text-in-nested-multicol-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
        "variable-fragmentainer-size-001.html": [
         "f75a8cf216e9a7b03c4d92022b9a1fc880bc9e51",
         [
@@ -160740,7 +160800,7 @@
       ]
      ],
      "contain-layout-ink-overflow-019.html": [
-      "5cda6cd5bebb2f3353778eb17285b4dd487ca881",
+      "d4909aa70f597b31ca0c13a7c63ce3a810d44ccc",
       [
        null,
        [
@@ -160749,23 +160809,7 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            1
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "contain-layout-ink-overflow-020.html": [
@@ -160782,7 +160826,7 @@
       ]
      ],
      "contain-layout-overflow-001.html": [
-      "05c66fa1e985261dcf8bab284ad05c9b88e293ba",
+      "5bf984e2bf12263526165048c4aeb0e9236c5bbb",
       [
        null,
        [
@@ -160791,23 +160835,7 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            1
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "contain-layout-overflow-002.html": [
@@ -214902,12 +214930,12 @@
        ]
       ],
       "clip-not-absolute-positioned-003.html": [
-       "ee3765db7aca5db4d569fdc7b40dcdc633c679a9",
+       "f6842c50edfbd736a8c26388038b8be0fad4b735",
        [
         null,
         [
          [
-          "/css/css-masking/clip/reference/clip-no-clipping-ref.html",
+          "/css/css-masking/clip/reference/clip-no-clipping-no-text-ref.html",
           "=="
          ]
         ],
@@ -225037,6 +225065,19 @@
        {}
       ]
      ],
+     "multicol-on-broken-image-alt-text.html": [
+      "46e8423b3f2c161a9fabdc9b5d847472a5e2559c",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "multicol-oof-inline-cb-001.html": [
       "76c48e8059536707186ae6131fd64f75d3734b2d",
       [
@@ -233272,7 +233313,7 @@
       ]
      ],
      "scrollable-overflow-input-001.html": [
-      "1b58803079f8b60b68eb1c57a0c522962e0a8019",
+      "47531c7c8d81e9b84ca690da1ce57cd6e4828fb7",
       [
        null,
        [
@@ -233285,7 +233326,7 @@
       ]
      ],
      "scrollable-overflow-input-002.html": [
-      "3efebf0b90da7eec05fa4df14b4ac6c78e774773",
+      "3cb9756dfade994622a38bb2394d3ff493226fcf",
       [
        null,
        [
@@ -233324,7 +233365,7 @@
       ]
      ],
      "scrollbar-gutter-002.html": [
-      "73c10dc7b3feccdf97ec442c504dad70e6ea0feb",
+      "129eb2c08590c98505e36f63da173d1c8a4bf98d",
       [
        null,
        [
@@ -233333,23 +233374,7 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            20
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "scrollbar-gutter-abspos-001.html": [
@@ -233522,7 +233547,7 @@
       ]
      ],
      "scrollbar-gutter-vertical-lr-002.html": [
-      "598cfdf3664f6ba14df20b73b3383ceb091fe12c",
+      "9e5dcd299eba99e4ab6f077149a841011805c0a5",
       [
        null,
        [
@@ -233531,27 +233556,11 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            25
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "scrollbar-gutter-vertical-rl-002.html": [
-      "398751845cf3d01dc47254e146d9bb1ada18bf40",
+      "d68d4e5d3cba0353da274f9c75c558c0a8324092",
       [
        null,
        [
@@ -233560,23 +233569,7 @@
          "=="
         ]
        ],
-       {
-        "fuzzy": [
-         [
-          null,
-          [
-           [
-            1,
-            1
-           ],
-           [
-            0,
-            50
-           ]
-          ]
-         ]
-        ]
-       }
+       {}
       ]
      ],
      "scrollbar-gutter-with-background-gradient.html": [
@@ -237578,7 +237571,7 @@
        ]
       ],
       "position-sticky-in-fixed-container.html": [
-       "75c2d67259e39513e6fbc7e5daa8d3b227a8ab9c",
+       "359ec2fd337e76e5ba1540754c87375c4090c1e2",
        [
         null,
         [
@@ -237587,23 +237580,7 @@
           "=="
          ]
         ],
-        {
-         "fuzzy": [
-          [
-           null,
-           [
-            [
-             1,
-             1
-            ],
-            [
-             0,
-             50
-            ]
-           ]
-          ]
-         ]
-        }
+        {}
        ]
       ],
       "position-sticky-inline.html": [
@@ -246431,7 +246408,7 @@
          ]
         ],
         "shape-outside-linear-gradient-005.html": [
-         "6d0fc21361bd3dd36b7b7f96659f9eed8c4dffab",
+         "2f6823ac6dba382f2e647764b48df78777dbb26c",
          [
           null,
           [
@@ -246440,11 +246417,27 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               7600,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-006.html": [
-         "68243e0ab8f8848a6da29e78b69acda56f878e76",
+         "e0a180d6877cdb6c306954402d42b7e792261b46",
          [
           null,
           [
@@ -246453,11 +246446,27 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               7600,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-007.html": [
-         "4ef0b6b5dfeaec318dc7f612d52073a8c3f12e39",
+         "1eca566a0b459bb4f4008cab2ee702f3b4d5c989",
          [
           null,
           [
@@ -246466,7 +246475,23 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               7600,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-008.html": [
@@ -246483,7 +246508,7 @@
          ]
         ],
         "shape-outside-linear-gradient-009.html": [
-         "50c80d0ac76e2a98a60cd40a5b82fa017e0f8a7a",
+         "e3ebf3c29d626f9d58a9589b2d26f1c30e7518a7",
          [
           null,
           [
@@ -246492,11 +246517,27 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               7600,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-010.html": [
-         "1e245cb285c465383253232cf005cd88de070b97",
+         "ca24c1a01473c50895e028179132a259d2e9a56a",
          [
           null,
           [
@@ -246505,7 +246546,23 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               1
+              ],
+              [
+               7600,
+               8700
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-linear-gradient-011.html": [
@@ -246585,6 +246642,19 @@
           ],
           {}
          ]
+        ],
+        "shape-outside-linear-gradient-horizontal-rtl.html": [
+         "35e224eceff01b3716f55a15afffcf57efead011",
+         [
+          null,
+          [
+           [
+            "/css/css-shapes/shape-outside/shape-image/gradients/reference/shape-outside-linear-gradient-horizontal-rtl-ref.html",
+            "=="
+           ]
+          ],
+          {}
+         ]
         ]
        },
        "shape-image-000.html": [
@@ -247602,7 +247672,7 @@
          ]
         ],
         "shape-outside-circle-052.html": [
-         "d8c462a563d07d6332925cd6684ac6a2f5b64376",
+         "d9242d7a118902e7c93a3eafc9799706423fdf66",
          [
           null,
           [
@@ -247611,11 +247681,27 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               2
+              ],
+              [
+               3,
+               3
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-circle-053.html": [
-         "4ee2f880fa0264ebf59eeb249571591a174d7c05",
+         "77849f2f6ee4974fec8aed451cd01c1fe5864f02",
          [
           null,
           [
@@ -247624,7 +247710,23 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               2
+              ],
+              [
+               1,
+               3
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-circle-054.html": [
@@ -248290,7 +248392,7 @@
          ]
         ],
         "shape-outside-ellipse-050.html": [
-         "18890072a7f414022c29f247212a45899def0faf",
+         "d31a7f677ea39a435f9018e1eb4ff3e0e93c7037",
          [
           null,
           [
@@ -248299,11 +248401,27 @@
             "=="
            ]
           ],
-          {}
+          {
+           "fuzzy": [
+            [
+             null,
+             [
+              [
+               0,
+               2
+              ],
+              [
+               2,
+               2
+              ]
+             ]
+            ]
+           ]
+          }
          ]
         ],
         "shape-outside-ellipse-051.html": [
-         "764406a0bbcfabb06271e9c1c4eb028692f21d20",
+         "d379b935aa31f39e55a95c572189462efcd9308e",
          [
           null,
           [
@@ -248312,7 +248430,23 @@
             "=="
            ]
           ],
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+       "disown_data": {
+        "collector.py": [
+         "8e77058077c94f3864560477edac387699a0678c",
+         [
+          null,
+          {}
+         ]
+        ],
+        "invalid.py": [
+         "d3cfb3ec85c2d0a65e5b24771b85469ddd3edcdf",
+         [
+          null,
+          {}
+         ]
+        ],
+        "request.py": [
+         "7a3fde4870563878d432a596d2d03c307316f8e3",
+         [
+          null,
+          {}
+         ]
+        ]
+       },
        "fail_request": {
         "invalid.py": [
          "ead87c1a376ec403c24ca8cd6b4b04bf2a1de0fa",
@@ -944467,7 +945163,7 @@
          ]
         ],
         "invalid.py": [
-         "2ee725bef97787d1ec67681ffeab18330128eed1",
+         "963488865f95997449b856877cc10e0f36222c31",
          [
           null,
           {}
@@ -946603,7 +947299,7 @@
         ]
        ],
        "pointer_mouse.py": [
-        "0a35cf945500f6e8c10ee4e78c21e820b36b2065",
+        "2b069b7c3633f4bf4da7fc1b19f5d46cd996dedd",
         [
          null,
          {}
diff --git a/tests/wpt/meta/content-security-policy/xslt/document-function-blocked.html.ini b/tests/wpt/meta/content-security-policy/xslt/document-function-blocked.html.ini
new file mode 100644
index 00000000000..d5b8574ba09
--- /dev/null
+++ b/tests/wpt/meta/content-security-policy/xslt/document-function-blocked.html.ini
@@ -0,0 +1,4 @@
+[document-function-blocked.html]
+  expected: TIMEOUT
+  [XSL document() function is blocked by CSP]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/content-security-policy/xslt/xsltprocessor-include-blocked.html.ini b/tests/wpt/meta/content-security-policy/xslt/xsltprocessor-include-blocked.html.ini
new file mode 100644
index 00000000000..3980667fa8a
--- /dev/null
+++ b/tests/wpt/meta/content-security-policy/xslt/xsltprocessor-include-blocked.html.ini
@@ -0,0 +1,4 @@
+[xsltprocessor-include-blocked.html]
+  expected: TIMEOUT
+  [xsltprocessor-include-blocked]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/css/css-cascade/layer-cssom-order-reverse.html.ini b/tests/wpt/meta/css/css-cascade/layer-cssom-order-reverse.html.ini
new file mode 100644
index 00000000000..6694f4405f2
--- /dev/null
+++ b/tests/wpt/meta/css/css-cascade/layer-cssom-order-reverse.html.ini
@@ -0,0 +1,3 @@
+[layer-cssom-order-reverse.html]
+  [Delete layer invalidates @font-face]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini b/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
index 16cf7474802..6cdbdb3b9d2 100644
--- a/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
+++ b/tests/wpt/meta/css/css-cascade/layer-font-face-override.html.ini
@@ -5,3 +5,9 @@
 
   [@font-face override between layers]
     expected: [FAIL, PASS]
+
+  [@font-face override update with appended sheet 1]
+    expected: FAIL
+
+  [@font-face override update with appended sheet 2]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html.ini b/tests/wpt/meta/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html.ini
new file mode 100644
index 00000000000..5fe35d23034
--- /dev/null
+++ b/tests/wpt/meta/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html.ini
@@ -0,0 +1,2 @@
+[chrome-bug-439886903-crash.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/css/css-fonts/downloadable-font-scoped-to-document.html.ini b/tests/wpt/meta/css/css-fonts/downloadable-font-scoped-to-document.html.ini
new file mode 100644
index 00000000000..7cc313b657d
--- /dev/null
+++ b/tests/wpt/meta/css/css-fonts/downloadable-font-scoped-to-document.html.ini
@@ -0,0 +1,2 @@
+[downloadable-font-scoped-to-document.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-mixins/cssom.tentative.html.ini b/tests/wpt/meta/css/css-mixins/cssom.tentative.html.ini
new file mode 100644
index 00000000000..8099fe8f7b9
--- /dev/null
+++ b/tests/wpt/meta/css/css-mixins/cssom.tentative.html.ini
@@ -0,0 +1,12 @@
+[cssom.tentative.html]
+  [serialization of @mixin]
+    expected: FAIL
+
+  [serialization of rule with @apply]
+    expected: FAIL
+
+  [serialization of @mixin with @contents]
+    expected: FAIL
+
+  [serialization of rule with @apply and contents argument]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-mixins/invalidation.tentative.html.ini b/tests/wpt/meta/css/css-mixins/invalidation.tentative.html.ini
new file mode 100644
index 00000000000..cdbda2c5c8a
--- /dev/null
+++ b/tests/wpt/meta/css/css-mixins/invalidation.tentative.html.ini
@@ -0,0 +1,9 @@
+[invalidation.tentative.html]
+  [invalidation of @mixin from same stylesheet]
+    expected: FAIL
+
+  [invalidation of @mixin from different stylesheet]
+    expected: FAIL
+
+  [invalidation on adding @apply rule]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-mixins/media-queries.html.ini b/tests/wpt/meta/css/css-mixins/media-queries.html.ini
new file mode 100644
index 00000000000..ff2960fb7fe
--- /dev/null
+++ b/tests/wpt/meta/css/css-mixins/media-queries.html.ini
@@ -0,0 +1,3 @@
+[media-queries.html]
+  [CSS Mixins: Media Queries and invalidation]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-computed.html.ini b/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-computed.html.ini
new file mode 100644
index 00000000000..1dfea07fa96
--- /dev/null
+++ b/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-computed.html.ini
@@ -0,0 +1,18 @@
+[rotate-parsing-computed.html]
+  [Property rotate value '-0.5 0 0 400grad']
+    expected: FAIL
+
+  [Property rotate value '-1 0 0 400grad']
+    expected: FAIL
+
+  [Property rotate value '0 -0.5 0 400grad']
+    expected: FAIL
+
+  [Property rotate value '0 -1 0 400grad']
+    expected: FAIL
+
+  [Property rotate value '0 0 -0.5 400grad']
+    expected: FAIL
+
+  [Property rotate value '0 0 -1 400grad']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-valid.html.ini b/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-valid.html.ini
index dc904c73c6f..3a8b2c9ee48 100644
--- a/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-valid.html.ini
+++ b/tests/wpt/meta/css/css-transforms/parsing/rotate-parsing-valid.html.ini
@@ -1,3 +1,21 @@
 [rotate-parsing-valid.html]
   [e.style['rotate'\] = "z 400grad" should set the property value]
     expected: FAIL
+
+  [e.style['rotate'\] = "-0.5 0 0 400grad" should set the property value]
+    expected: FAIL
+
+  [e.style['rotate'\] = "-1 0 0 400grad" should set the property value]
+    expected: FAIL
+
+  [e.style['rotate'\] = "0 -0.5 0 400grad" should set the property value]
+    expected: FAIL
+
+  [e.style['rotate'\] = "0 -1 0 400grad" should set the property value]
+    expected: FAIL
+
+  [e.style['rotate'\] = "0 0 -0.5 400grad" should set the property value]
+    expected: FAIL
+
+  [e.style['rotate'\] = "0 0 -1 400grad" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/attr-all-types.html.ini b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
index 0b39fc70aac..4ff0064ac41 100644
--- a/tests/wpt/meta/css/css-values/attr-all-types.html.ini
+++ b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
@@ -35,9 +35,6 @@
   [CSS Values and Units Test: attr 12]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 16]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 17]
     expected: FAIL
 
@@ -62,9 +59,6 @@
   [CSS Values and Units Test: attr 23]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 14]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 28]
     expected: FAIL
 
@@ -74,18 +68,9 @@
   [CSS Values and Units Test: attr 40]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 41]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 42]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 43]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 44]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 45]
     expected: FAIL
 
@@ -122,9 +107,6 @@
   [CSS Values and Units Test: attr 59]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 60]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 61]
     expected: FAIL
 
@@ -158,9 +140,6 @@
   [CSS Values and Units Test: attr 29]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 32]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 71]
     expected: FAIL
 
@@ -185,15 +164,6 @@
   [CSS Values and Units Test: attr 78]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 15]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 30]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 31]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 33]
     expected: FAIL
 
@@ -212,15 +182,6 @@
   [CSS Values and Units Test: attr 82]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 92]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 93]
-    expected: FAIL
-
-  [CSS Values and Units Test: attr 94]
-    expected: FAIL
-
   [CSS Values and Units Test: attr 8]
     expected: FAIL
 
@@ -239,5 +200,44 @@
   [CSS Values and Units Test: attr 83]
     expected: FAIL
 
-  [CSS Values and Units Test: attr 95]
+  [CSS Values and Units Test: attr 35]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 36]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 38]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 54]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 84]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 85]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 86]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 87]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 88]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 89]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 98]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 99]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 100]
+    expected: FAIL
+
+  [CSS Values and Units Test: attr 101]
     expected: FAIL
diff --git a/tests/wpt/meta/css/filter-effects/backdrop-filter-inline-positioning.html.ini b/tests/wpt/meta/css/filter-effects/backdrop-filter-inline-positioning.html.ini
new file mode 100644
index 00000000000..4a6013cc664
--- /dev/null
+++ b/tests/wpt/meta/css/filter-effects/backdrop-filter-inline-positioning.html.ini
@@ -0,0 +1,2 @@
+[backdrop-filter-inline-positioning.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/filter-effects/svg-empty-element-with-filter-001.html.ini b/tests/wpt/meta/css/filter-effects/svg-empty-element-with-filter-001.html.ini
new file mode 100644
index 00000000000..db712884588
--- /dev/null
+++ b/tests/wpt/meta/css/filter-effects/svg-empty-element-with-filter-001.html.ini
@@ -0,0 +1,2 @@
+[svg-empty-element-with-filter-001.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/selectors/parsing/parse-heading.html.ini b/tests/wpt/meta/css/selectors/parsing/parse-heading.html.ini
new file mode 100644
index 00000000000..1efaf2bdede
--- /dev/null
+++ b/tests/wpt/meta/css/selectors/parsing/parse-heading.html.ini
@@ -0,0 +1,30 @@
+[parse-heading.html]
+  [":heading" should be a valid selector]
+    expected: FAIL
+
+  [":heading(2)" should be a valid selector]
+    expected: FAIL
+
+  [":heading(99999)" should be a valid selector]
+    expected: FAIL
+
+  [":heading(0)" should be a valid selector]
+    expected: FAIL
+
+  [":heading(0, 1, 2)" should be a valid selector]
+    expected: FAIL
+
+  [":heading(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)" should be a valid selector]
+    expected: FAIL
+
+  [":heading(-1)" should be a valid selector]
+    expected: FAIL
+
+  ["h1:heading" should be a valid selector]
+    expected: FAIL
+
+  ["h1:heading(1)" should be a valid selector]
+    expected: FAIL
+
+  ["h1:heading(2)" should be a valid selector]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/abort/AbortSignal.any.js.ini b/tests/wpt/meta/dom/abort/AbortSignal.any.js.ini
index 474bf21084b..30f378796fe 100644
--- a/tests/wpt/meta/dom/abort/AbortSignal.any.js.ini
+++ b/tests/wpt/meta/dom/abort/AbortSignal.any.js.ini
@@ -30,7 +30,7 @@
   expected: ERROR
 
 [AbortSignal.https.any.shadowrealm-in-audioworklet.html]
-  expected: TIMEOUT
+  expected: ERROR
 
 [AbortSignal.any.shadowrealm-in-dedicatedworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/dom/abort/event.any.js.ini b/tests/wpt/meta/dom/abort/event.any.js.ini
index d1ed136b2b8..f15826145bd 100644
--- a/tests/wpt/meta/dom/abort/event.any.js.ini
+++ b/tests/wpt/meta/dom/abort/event.any.js.ini
@@ -24,7 +24,7 @@
   expected: ERROR
 
 [event.https.any.shadowrealm-in-audioworklet.html]
-  expected: TIMEOUT
+  expected: ERROR
 
 [event.https.any.shadowrealm-in-serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/fetch/api/idlharness.any.js.ini b/tests/wpt/meta/fetch/api/idlharness.any.js.ini
index 58df7ba3188..9a7a7b2795d 100644
--- a/tests/wpt/meta/fetch/api/idlharness.any.js.ini
+++ b/tests/wpt/meta/fetch/api/idlharness.any.js.ini
@@ -64,6 +64,36 @@
   [Request interface: new Request('about:blank') must inherit property "duplex" with the proper type]
     expected: FAIL
 
+  [FetchLaterResult interface: existence and properties of interface object]
+    expected: FAIL
+
+  [FetchLaterResult interface object length]
+    expected: FAIL
+
+  [FetchLaterResult interface object name]
+    expected: FAIL
+
+  [FetchLaterResult interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [FetchLaterResult interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [FetchLaterResult interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [FetchLaterResult interface: attribute activated]
+    expected: FAIL
+
+  [Window interface: operation fetchLater(RequestInfo, optional DeferredRequestInit)]
+    expected: FAIL
+
+  [Window interface: window must inherit property "fetchLater(RequestInfo, optional DeferredRequestInit)" with the proper type]
+    expected: FAIL
+
+  [Window interface: calling fetchLater(RequestInfo, optional DeferredRequestInit) on window with too few arguments must throw TypeError]
+    expected: FAIL
+
 
 [idlharness.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/fetch/metadata/generated/css-font-face.sub.tentative.html.ini b/tests/wpt/meta/fetch/metadata/generated/css-font-face.sub.tentative.html.ini
index 0ca3d822ceb..d55596a6a0d 100644
--- a/tests/wpt/meta/fetch/metadata/generated/css-font-face.sub.tentative.html.ini
+++ b/tests/wpt/meta/fetch/metadata/generated/css-font-face.sub.tentative.html.ini
@@ -49,3 +49,6 @@
 
   [sec-fetch-storage-access - Not sent to non-trustworthy same-site destination]
     expected: FAIL
+
+  [sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination]
+    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 5aef7ce66ce..324db3d9b35 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
@@ -10,6 +10,3 @@
 
   [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/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index 7a5fcb79165..00000000000
--- a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini b/tests/wpt/meta/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
new file mode 100644
index 00000000000..5cdcce07c65
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
@@ -0,0 +1,2 @@
+[canvas.2d.disconnected.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html.ini
deleted file mode 100644
index 8e67fee45b7..00000000000
--- a/tests/wpt/meta/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-[the-anchor-attribute-003.tentative.html]
-  [::before uses originating element's implicit anchor]
-    expected: FAIL
-
-  [::after uses originating element's implicit anchor]
-    expected: FAIL
-
-  [::backdrop uses originating element's implicit anchor]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/idlharness.https.html.ini b/tests/wpt/meta/html/dom/idlharness.https.html.ini
index a9173ff4def..cce32646d7d 100644
--- a/tests/wpt/meta/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/meta/html/dom/idlharness.https.html.ini
@@ -7107,3 +7107,21 @@
 
   [HTMLTemplateElement interface: document.createElement("template") must inherit property "shadowRootCustomElementRegistry" with the proper type]
     expected: FAIL
+
+  [HTMLSelectedContentElement interface: existence and properties of interface object]
+    expected: FAIL
+
+  [HTMLSelectedContentElement interface object length]
+    expected: FAIL
+
+  [HTMLSelectedContentElement interface object name]
+    expected: FAIL
+
+  [HTMLSelectedContentElement interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [HTMLSelectedContentElement interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [HTMLSelectedContentElement interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
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 9e6f4115b8c..0cfee719c4e 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
@@ -1,6 +1,7 @@
 [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: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index 7df8f9458e9..68203d2a082 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,4 +1,4 @@
 [iframe_sandbox_popups_escaping-2.html]
   expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 6a420504feb..1c4e58a8ba1 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_escaping-3.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     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-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index d5fd800f09d..d89a1691435 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
@@ -1,4 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    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
new file mode 100644
index 00000000000..5983b46a9ab
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/forms/the-fieldset-element/disabled-003.html.ini
@@ -0,0 +1,2 @@
+[disabled-003.html]
+  expected: CRASH
diff --git a/tests/wpt/meta/html/semantics/permission-element/parent-image-mask.tentative.html.ini b/tests/wpt/meta/html/semantics/permission-element/parent-image-mask.tentative.html.ini
new file mode 100644
index 00000000000..a2ae0f7d4e8
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/permission-element/parent-image-mask.tentative.html.ini
@@ -0,0 +1,4 @@
+[parent-image-mask.tentative.html]
+  expected: TIMEOUT
+  [Permission element is invalid if it has a parent with mask-image.]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/permission-element/parent-mask.tentative.html.ini b/tests/wpt/meta/html/semantics/permission-element/parent-mask.tentative.html.ini
new file mode 100644
index 00000000000..11afd5d53bd
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/permission-element/parent-mask.tentative.html.ini
@@ -0,0 +1,4 @@
+[parent-mask.tentative.html]
+  expected: TIMEOUT
+  [Permission element is invalid if it has a parent with a mask.]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini b/tests/wpt/meta/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini
new file mode 100644
index 00000000000..86e95d0ff4c
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/scripting-1/the-script-element/execution-timing/077.html.ini
@@ -0,0 +1,3 @@
+[077.html]
+  [ adding several types of scripts through the DOM and removing some of them confuses scheduler ]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html.ini b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html.ini
deleted file mode 100644
index 3ac9a71addd..00000000000
--- a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[script-src-event-handler.html]
-  [Speculative parsing, page load: script-src-event-handler]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.html.ini b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.tentative.html.ini
similarity index 66%
rename from tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.html.ini
rename to tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.tentative.html.ini
index 78f5e63c885..f100a3b8b87 100644
--- a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.html.ini
+++ b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.tentative.html.ini
@@ -1,3 +1,3 @@
-[script-src-nomodule.html]
+[script-src-nomodule.tentative.html]
   [Speculative parsing, page load: script-src-nomodule]
     expected: FAIL
diff --git a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html.ini b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html.ini
deleted file mode 100644
index 0726a34141c..00000000000
--- a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[script-src-unsupported-language.html]
-  [Speculative parsing, page load: script-src-unsupported-language]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.html.ini b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.tentative.html.ini
similarity index 64%
rename from tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.html.ini
rename to tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.tentative.html.ini
index 0fbcb350c09..adedaa27c01 100644
--- a/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.html.ini
+++ b/tests/wpt/meta/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.tentative.html.ini
@@ -1,3 +1,3 @@
-[script-src-unsupported-type.html]
+[script-src-unsupported-type.tentative.html]
   [Speculative parsing, page load: script-src-unsupported-type]
     expected: FAIL
diff --git a/tests/wpt/meta/notifications/idlharness.https.any.js.ini b/tests/wpt/meta/notifications/idlharness.https.any.js.ini
index 56add32751d..9925c446f73 100644
--- a/tests/wpt/meta/notifications/idlharness.https.any.js.ini
+++ b/tests/wpt/meta/notifications/idlharness.https.any.js.ini
@@ -8,6 +8,12 @@
   [ServiceWorkerRegistration interface: operation getNotifications(optional GetNotificationOptions)]
     expected: FAIL
 
+  [Notification interface: attribute navigate]
+    expected: FAIL
+
+  [Notification interface: notification must inherit property "navigate" with the proper type]
+    expected: FAIL
+
 
 [idlharness.https.any.html]
   [ServiceWorkerRegistration interface: operation showNotification(DOMString, optional NotificationOptions)]
@@ -16,6 +22,12 @@
   [ServiceWorkerRegistration interface: operation getNotifications(optional GetNotificationOptions)]
     expected: FAIL
 
+  [Notification interface: attribute navigate]
+    expected: FAIL
+
+  [Notification interface: notification must inherit property "navigate" with the proper type]
+    expected: FAIL
+
 
 [idlharness.https.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/preload/preload-error.sub.html.ini b/tests/wpt/meta/preload/preload-error.sub.html.ini
index ed3db641537..e86b9eb8da6 100644
--- a/tests/wpt/meta/preload/preload-error.sub.html.ini
+++ b/tests/wpt/meta/preload/preload-error.sub.html.ini
@@ -56,9 +56,6 @@
   [MIME-blocked-nosniff (script): main]
     expected: FAIL
 
-  [CORS (xhr): main]
-    expected: FAIL
-
   [success (xhr): main]
     expected: FAIL
 
@@ -74,5 +71,5 @@
   [404 (script): main]
     expected: FAIL
 
-  [CORS (script): main]
+  [Decode-error (style): main]
     expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/initiator-type/svg.html.ini b/tests/wpt/meta/resource-timing/initiator-type/svg.html.ini
index 85fe5c76c05..b9f5b1f1f2f 100644
--- a/tests/wpt/meta/resource-timing/initiator-type/svg.html.ini
+++ b/tests/wpt/meta/resource-timing/initiator-type/svg.html.ini
@@ -1,3 +1,6 @@
 [svg.html]
   [The initiator type for <image> in an <svg> must be 'image']
     expected: FAIL
+
+  [The initiator type for <use> in an <svg> must be 'other']
+    expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/tentative/document-initiated.html.ini b/tests/wpt/meta/resource-timing/tentative/document-initiated.html.ini
deleted file mode 100644
index 6d29e8193e7..00000000000
--- a/tests/wpt/meta/resource-timing/tentative/document-initiated.html.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-[document-initiated.html]
-  [Ensure initiator Attribute matches with Document ResourceID]
-    expected: TIMEOUT
-
-  [initiatorUrl by main html file]
-    expected: FAIL
-
-  [initiatorUrl for resource by document.write()]
-    expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/tentative/initiator-url/document-initiated.html.ini b/tests/wpt/meta/resource-timing/tentative/initiator-url/document-initiated.html.ini
new file mode 100644
index 00000000000..8077cc2e810
--- /dev/null
+++ b/tests/wpt/meta/resource-timing/tentative/initiator-url/document-initiated.html.ini
@@ -0,0 +1,42 @@
+[document-initiated.html]
+  [The initiator Url for empty.js?blocking initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for display_paragraph.js initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty.js?async initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty.js?deferred initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty.js?module initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty_style.css?link initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for blue.png?inline-style initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for Ahem.ttf?initiator-html initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for blue.png?using-Img-tag initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty_style.css?inline-script initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for blue.png?inline-script initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for blue.png?inline-script-doc-write initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty_style.css?inline-script-doc-write initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
+
+  [The initiator Url for empty.js?doc-write initiatorUrl from document-initiated must be 'http://web-platform.test:8000/resource-timing/tentative/initiator-url/document-initiated.html']
+    expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/tentative/stylesheet-initiated.html.ini b/tests/wpt/meta/resource-timing/tentative/stylesheet-initiated.html.ini
index b4af8bc760b..495ce98da6a 100644
--- a/tests/wpt/meta/resource-timing/tentative/stylesheet-initiated.html.ini
+++ b/tests/wpt/meta/resource-timing/tentative/stylesheet-initiated.html.ini
@@ -1,4 +1,4 @@
 [stylesheet-initiated.html]
-  expected: TIMEOUT
+  expected: ERROR
   [Ensure initiator Attribute matches with Stylesheet ResourceID]
     expected: TIMEOUT
diff --git a/tests/wpt/meta/service-workers/idlharness.https.any.js.ini b/tests/wpt/meta/service-workers/idlharness.https.any.js.ini
index f85e3c42ea4..aba70ff3a35 100644
--- a/tests/wpt/meta/service-workers/idlharness.https.any.js.ini
+++ b/tests/wpt/meta/service-workers/idlharness.https.any.js.ini
@@ -108,6 +108,21 @@
   [Window interface: attribute caches]
     expected: FAIL
 
+  [ServiceWorkerContainer interface: operation register((TrustedScriptURL or USVString), optional RegistrationOptions)]
+    expected: TIMEOUT
+
+  [NavigationPreloadManager interface: operation enable()]
+    expected: TIMEOUT
+
+  [NavigationPreloadManager interface: operation disable()]
+    expected: TIMEOUT
+
+  [NavigationPreloadManager interface: operation setHeaderValue(ByteString)]
+    expected: TIMEOUT
+
+  [NavigationPreloadManager interface: operation getState()]
+    expected: TIMEOUT
+
 
 [idlharness.https.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/service-workers/service-worker/intercepted-referrer.https.html.ini b/tests/wpt/meta/service-workers/service-worker/intercepted-referrer.https.html.ini
new file mode 100644
index 00000000000..541e54f14a9
--- /dev/null
+++ b/tests/wpt/meta/service-workers/service-worker/intercepted-referrer.https.html.ini
@@ -0,0 +1,3 @@
+[intercepted-referrer.https.html]
+  [document.referrer for a navigation intercepted by a Service Worker is unchanged and matches the parent URL]
+    expected: FAIL
diff --git a/tests/wpt/meta/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html.ini b/tests/wpt/meta/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html.ini
index d3218647e91..b3600e39381 100644
--- a/tests/wpt/meta/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html.ini
+++ b/tests/wpt/meta/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html.ini
@@ -29,3 +29,6 @@
 
   [directive "require-trusted-types-for 'invalid'%20'script'" (required-ascii-whitespace)]
     expected: NOTRUN
+
+  [directive "require-trusted-types-for 'invalid'%0D%20'script'" (required-ascii-whitespace)]
+    expected: NOTRUN
diff --git a/tests/wpt/meta/urlpattern/urlpattern.any.js.ini b/tests/wpt/meta/urlpattern/urlpattern.any.js.ini
index 065a80d7f08..5126eaa4288 100644
--- a/tests/wpt/meta/urlpattern/urlpattern.any.js.ini
+++ b/tests/wpt/meta/urlpattern/urlpattern.any.js.ini
@@ -41,6 +41,15 @@
   [Pattern: [{"hostname":"bad\\\\:hostname"}\] Inputs: undefined]
     expected: FAIL
 
+  [Pattern: [{"protocol":"http","hostname":"example.com/ignoredpath"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com\\\\?ignoredsearch"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com#ignoredhash"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
 
 [urlpattern.any.sharedworker.html]
   expected: ERROR
@@ -88,6 +97,15 @@
   [Pattern: [{"hostname":"bad\\\\:hostname"}\] Inputs: undefined]
     expected: FAIL
 
+  [Pattern: [{"protocol":"http","hostname":"example.com/ignoredpath"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com\\\\?ignoredsearch"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com#ignoredhash"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
 
 [urlpattern.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/urlpattern/urlpattern.https.any.js.ini b/tests/wpt/meta/urlpattern/urlpattern.https.any.js.ini
index b94748d6714..48555769270 100644
--- a/tests/wpt/meta/urlpattern/urlpattern.https.any.js.ini
+++ b/tests/wpt/meta/urlpattern/urlpattern.https.any.js.ini
@@ -44,6 +44,15 @@
   [Pattern: [{"hostname":"bad\\\\:hostname"}\] Inputs: undefined]
     expected: FAIL
 
+  [Pattern: [{"protocol":"http","hostname":"example.com/ignoredpath"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com\\\\?ignoredsearch"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com#ignoredhash"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
 
 [urlpattern.https.any.worker.html]
   [Pattern: [{"protocol":"http","port":"80 "}\] Inputs: [{"protocol":"http","port":"80"}\]]
@@ -88,6 +97,15 @@
   [Pattern: [{"hostname":"bad\\\\:hostname"}\] Inputs: undefined]
     expected: FAIL
 
+  [Pattern: [{"protocol":"http","hostname":"example.com/ignoredpath"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com\\\\?ignoredsearch"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
+  [Pattern: [{"protocol":"http","hostname":"example.com#ignoredhash"}\] Inputs: ["http://example.com/"\]]
+    expected: FAIL
+
 
 [urlpattern.https.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html.ini
index 38cd20fa0fd..1dca5d4ae18 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html.ini
@@ -10,3 +10,6 @@
 
   [# AUDIT TASK RUNNER FINISHED: 1 out of 5 tasks were failed.]
     expected: FAIL
+
+  [AudioNodeOptions behavior for ChannelMergerNode]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html.ini
index bddfce82aff..2766c345ffe 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html.ini
@@ -7,3 +7,12 @@
 
   [Executing "test3"]
     expected: FAIL
+
+  [Compare value setter and setValueAtTime]
+    expected: FAIL
+
+  [Automation effects]
+    expected: FAIL
+
+  [Dezippering of GainNode removed]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html.ini
index f3b0613af11..cdf6e8bc6cb 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html.ini
@@ -1,3 +1,6 @@
 [waveshaper-limits.html]
   [Executing "test"]
     expected: FAIL
+
+  [WaveShaperNode maps input values outside [-1,1\] according to curve and clamps output correctly]
+    expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html.ini b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html.ini
index e1cca82524c..eb65c6cd40c 100644
--- a/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html.ini
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html.ini
@@ -1,3 +1,6 @@
 [waveshaper.html]
   [Executing "test"]
     expected: FAIL
+
+  [WaveShaperNode applies non-linear distortion correctly]
+    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
deleted file mode 100644
index 0e57356683e..00000000000
--- a/tests/wpt/meta/webxr/render_state_update.https.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[render_state_update.https.html]
-  expected: ERROR
diff --git a/tests/wpt/tests/.github/workflows/docker.yml b/tests/wpt/tests/.github/workflows/docker.yml
index 12b5adc7ee9..29e9ba6e084 100644
--- a/tests/wpt/tests/.github/workflows/docker.yml
+++ b/tests/wpt/tests/.github/workflows/docker.yml
@@ -26,14 +26,14 @@ jobs:
         uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4.1.0
       # Based on https://docs.github.com/en/actions/publishing-packages/publishing-docker-images.
       - name: Log in to the Container registry
-        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
+        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
diff --git a/tests/wpt/tests/.well-known/device-bound-sessions b/tests/wpt/tests/.well-known/device-bound-sessions
new file mode 100644
index 00000000000..7944486181b
--- /dev/null
+++ b/tests/wpt/tests/.well-known/device-bound-sessions
@@ -0,0 +1,8 @@
+import json
+
+def main(request, response):
+    response_body = {
+        "registering_origins": ['https://www.' + request.headers.get('host').decode("utf-8")],
+    }
+    return (200, [('Content-Type', 'application/json'), ('Set-Cookie', 'well_known_fetched=true; Path=/device-bound-session-credentials')],
+            json.dumps(response_body))
diff --git a/tests/wpt/tests/FileAPI/blob/Blob-slice.any.js b/tests/wpt/tests/FileAPI/blob/Blob-slice.any.js
index c48d4703d86..6a7d9c3fab1 100644
--- a/tests/wpt/tests/FileAPI/blob/Blob-slice.any.js
+++ b/tests/wpt/tests/FileAPI/blob/Blob-slice.any.js
@@ -73,6 +73,21 @@ test(function() {
        {start: 7, end:   4, contents: ""}]
     ],
 
+    // Test double start/end values
+    [
+      ["abcd"],
+      [{start: 0.5, contents: "abcd"},
+       {start: 1.5, contents: "cd"},
+       {start: 2.5, contents: "cd"},
+       {start: 3.5, contents: ""},
+       {start: 0,   end: 0.5, contents: ""},
+       {start: 0,   end: 1.5, contents: "ab"},
+       {start: 0,   end: 2.5, contents: "ab"},
+       {start: 0,   end: 3.5, contents: "abcd"},
+       {start: 1.5, end: 2.5, contents: ""},
+       {start: 1.5, end: 3.5, contents: "cd"}]
+    ],
+
     // Test 3 strings
     [
       ["foo", "bar", "baz"],
diff --git a/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-ignore.html b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-ignore.html
new file mode 100644
index 00000000000..43c6e7adabb
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-ignore.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, with a child img inside of the inner, and a containertiming-ignore between the roots</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1, 'one entry expected for the image, for the inner containertiming');
+        const entry = entryList.getEntries()[0];
+        checkContainerEntry(entry, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry, [0, 100, 0, 100])
+        checkContainerSize(entry, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'transparent');
+    document.body.appendChild(div1);
+
+    // Intermediate div with containertiming-ignore blocking propagation to
+    // the parent containertiming root
+    const div2 = document.createElement('div');
+    div2.setAttribute('containertiming-ignore', '');
+    div1.appendChild(div2);
+
+    // Add another div, child of the first, that is also a container root
+    const div3 = document.createElement('div');
+    div3.setAttribute('containertiming', 'div2_ct');
+    div2.appendChild(div3);
+
+    // 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');
+    div3.appendChild(img);
+
+    beforeRender = performance.now();
+  }, 'A parent containertiming root with transparent nesting policy does not get paints from children containertiming roots if an intermediate ignore is set.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-intermediate-nesting-transparent.html b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-intermediate-nesting-transparent.html
new file mode 100644
index 00000000000..bff241b33b0
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-containertiming-child-img-with-intermediate-nesting-transparent.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, with a child img inside of the inner, and an intermediate nesting policy that is not used</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1, 'one entry expected for the image, for the inner containertiming');
+        const entry = entryList.getEntries()[0];
+        checkContainerEntry(entry, 'div3_ct', 'img_id', beforeRender)
+        checkRect(entry, [0, 100, 0, 100])
+        checkContainerSize(entry, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    document.body.appendChild(div1);
+
+    // Add an intermediate div between container timing roots, that sets a
+    // nesting policy. This should be ignored.
+    const div2 = document.createElement('div');
+    div2.setAttribute('containertiming-nesting', 'transparent');
+    div1.appendChild(div2);
+
+    // Add another div, child of the first, that is also a container root
+    const div3 = document.createElement('div');
+    div3.setAttribute('containertiming', 'div3_ct');
+    div2.appendChild(div3);
+
+    // 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');
+    div3.appendChild(img);
+
+    beforeRender = performance.now();
+  }, 'A parent containertiming root with default nesting policy does not get paints from children containertiming roots, even if an intermediate node could set a different nesting policy.');
+</script>
+
+</body>
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 3f830fe7863..de51aa4ffef 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
@@ -45,7 +45,7 @@ body {
       div2.appendChild(img);
       beforeRender = performance.now();
     };
-  }, 'A parent containertiming root does not get paints from children containertiming roots.');
+  }, 'A parent containertiming root with default nesting policy does not get paints from children containertiming roots.');
 </script>
 
 </body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-from-invalid.html b/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-from-invalid.html
new file mode 100644
index 00000000000..318b66396bf
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-from-invalid.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent gets invalid, then transparent nesting policy, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 2, 'one entry expected for each of the containertiming roots');
+        const entries = entryList.getEntries();
+
+        const entry_div1 = entries.find(e => e.identifier == 'div1_ct');
+        checkContainerEntry(entry_div1, 'div1_ct', 'img_id', beforeRender)
+        checkRect(entry_div1, [0, 100, 0, 100])
+        checkContainerSize(entry_div1, 10000);
+
+        const entry_div2 = entries.find(e => e.identifier == 'div2_ct');
+        checkContainerEntry(entry_div2, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry_div2, [0, 100, 0, 100])
+        checkContainerSize(entry_div2, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root, set invalid nesting, then
+    // transparent
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'invalid');
+    document.body.appendChild(div1);
+    div1.setAttribute('containertiming-nesting', 'transparent');
+
+    // 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 switches from invalid nesting policy to transparent, generating one painting from each container timing root.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-to-invalid.html b/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-to-invalid.html
new file mode 100644
index 00000000000..4735709179d
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-containertiming-nesting-change-to-invalid.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent switching from transparent to invalid nesting policy, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1, 'one entry expected for the image, for the inner containertiming');
+        const entry = entryList.getEntries()[0];
+        checkContainerEntry(entry, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry, [0, 100, 0, 100])
+        checkContainerSize(entry, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'transparent');
+    document.body.appendChild(div1);
+    div1.setAttribute('containertiming-nesting', 'invalid');
+
+    // 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 switches from transparent nesting policy to invalid, generating only a paint for the inner container timing.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-shadowed-containertiming-child-img.html b/tests/wpt/tests/container-timing/tentative/nested-shadowed-containertiming-child-img.html
new file mode 100644
index 00000000000..692f501579c
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-shadowed-containertiming-child-img.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent with shadowed mode, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 2, 'for the image, one entry expected for each container timing');
+        const entries = entryList.getEntries();
+
+        const entry_div1 = entries.find(e => e.identifier == 'div1_ct');
+        checkContainerEntry(entry_div1, 'div1_ct', 'div2_id', beforeRender)
+        checkRect(entry_div1, [0, 100, 0, 100])
+        checkContainerSize(entry_div1, 10000);
+
+        const entry_div2 = entries.find(e => e.identifier == 'div2_ct');
+        checkContainerEntry(entry_div2, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry_div2, [0, 100, 0, 100])
+        checkContainerSize(entry_div2, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'shadowed');
+    document.body.appendChild(div1);
+
+    // Add another div, child of the first, that is also a container root
+    const div2 = document.createElement('div');
+    div2.setAttribute('id', 'div2_id');
+    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 shadowed nesting policy gets only child containertiming paints without element data.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-shadowed-to-transparent-containertiming-child-img.html b/tests/wpt/tests/container-timing/tentative/nested-shadowed-to-transparent-containertiming-child-img.html
new file mode 100644
index 00000000000..ef2034547ce
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-shadowed-to-transparent-containertiming-child-img.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent with shadowed mode changed to transparent mode, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 2, 'for the image, one entry expected for each containertiming');
+        const entries = entryList.getEntries();
+
+        const entry_div1 = entries.find(e => e.identifier == 'div1_ct');
+        checkContainerEntry(entry_div1, 'div1_ct', 'img_id', beforeRender)
+        checkRect(entry_div1, [0, 100, 0, 100])
+        checkContainerSize(entry_div1, 10000);
+
+        const entry_div2 = entries.find(e => e.identifier == 'div2_ct');
+        checkContainerEntry(entry_div2, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry_div2, [0, 100, 0, 100])
+        checkContainerSize(entry_div2, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'shadowed');
+    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);
+
+    div1.setAttribute('containertiming-nesting', 'transparent');
+
+    // 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 shadowed then transparent nesting policy gets child containertiming paints with element data.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img-with-intermediate-ignore.html b/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img-with-intermediate-ignore.html
new file mode 100644
index 00000000000..3a0a64b6455
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img-with-intermediate-ignore.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent with transparent mode, with a child img inside of the inner, and an intermediate ignore node</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1, 'only inner containertiming gets events, ignore breaks propagation to parent even if nesting is set to transparent');
+        const entry = entryList.getEntries()[0];
+        checkContainerEntry(entry, 'div3_ct', 'img_id', beforeRender)
+        checkRect(entry, [0, 100, 0, 100])
+        checkContainerSize(entry, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'transparent');
+    document.body.appendChild(div1);
+
+    const div2 = document.createElement('div');
+    div2.setAttribute('containertiming-ignore', '');
+    div1.appendChild(div2);
+
+    // Add another div, child of the first, that is also a container root
+    const div3 = document.createElement('div');
+    div3.setAttribute('containertiming', 'div3_ct');
+    div2.appendChild(div3);
+
+    // 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');
+    div3.appendChild(img);
+
+    beforeRender = performance.now();
+  }, 'A parent containertiming root with transparent nesting policy and child containertiming including image, an intermediate ignore blocks paints to parent root.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img.html b/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img.html
new file mode 100644
index 00000000000..9523cc88b09
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-transparent-containertiming-child-img.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent with transparent mode, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 2, 'for the image, one entry expected for each containertiming');
+        const entries = entryList.getEntries();
+
+        const entry_div1 = entries.find(e => e.identifier == 'div1_ct');
+        checkContainerEntry(entry_div1, 'div1_ct', 'img_id', beforeRender)
+        checkRect(entry_div1, [0, 100, 0, 100])
+        checkContainerSize(entry_div1, 10000);
+
+        const entry_div2 = entries.find(e => e.identifier == 'div2_ct');
+        checkContainerEntry(entry_div2, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry_div2, [0, 100, 0, 100])
+        checkContainerSize(entry_div2, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'transparent');
+    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 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 transparent nesting policy gets child containertiming paints with element data.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/container-timing/tentative/nested-transparent-to-shadowed-containertiming-child-img.html b/tests/wpt/tests/container-timing/tentative/nested-transparent-to-shadowed-containertiming-child-img.html
new file mode 100644
index 00000000000..250f779af75
--- /dev/null
+++ b/tests/wpt/tests/container-timing/tentative/nested-transparent-to-shadowed-containertiming-child-img.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Container Timing: two nested containertiming nodes, parent with transparent mode, changed to shadowed mode, with a child img inside of the inner</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<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");
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 2, 'for the image, one entry expected for each container timing');
+        const entries = entryList.getEntries();
+
+        const entry_div1 = entries.find(e => e.identifier == 'div1_ct');
+        checkContainerEntry(entry_div1, 'div1_ct', 'div2_id', beforeRender)
+        checkRect(entry_div1, [0, 100, 0, 100])
+        checkContainerSize(entry_div1, 10000);
+
+        const entry_div2 = entries.find(e => e.identifier == 'div2_ct');
+        checkContainerEntry(entry_div2, 'div2_ct', 'img_id', beforeRender)
+        checkRect(entry_div2, [0, 100, 0, 100])
+        checkContainerSize(entry_div2, 10000);
+      })
+    );
+    observer.observe({entryTypes: ['container']});
+
+    // Add a div that is the container timing root
+    const div1 = document.createElement('div');
+    div1.setAttribute('containertiming', 'div1_ct');
+    div1.setAttribute('containertiming-nesting', 'transparent');
+    document.body.appendChild(div1);
+
+    // Add another div, child of the first, that is also a container root
+    const div2 = document.createElement('div');
+    div2.setAttribute('id', 'div2_id');
+    div2.setAttribute('containertiming', 'div2_ct');
+    div1.appendChild(div2);
+
+    div1.setAttribute('containertiming-nesting', 'shadowed');
+
+    // 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 transparent then shadowed nesting policy gets child containertiming paints without element data.');
+</script>
+
+</body>
diff --git a/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html b/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html
new file mode 100644
index 00000000000..b06604dba3e
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>A Report-Only policy with a nonce does not send a report for an allowed link preload</title>
+<script nonce="abc" src="/resources/testharness.js"></script>
+<script nonce="abc" src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script nonce="abc">
+var testName = "Report should not be sent for an allowed link preload";
+addEventListener("load", () => {
+    const script = document.createElement("script");
+    script.nonce = "abc";
+    script.src = `../support/checkReport.sub.js?reportExists=false&testName=${encodeURIComponent(testName)}`;
+
+    document.body.appendChild(script);
+});
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html.sub.headers b/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html.sub.headers
new file mode 100644
index 00000000000..f9f981b1c91
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/reporting/link-preload-from-header-report-only-nonce.sub.html.sub.headers
@@ -0,0 +1,4 @@
+Set-Cookie: link-preload-report-only-nonce={{$id:uuid()}}; Path=/content-security-policy/reporting
+Content-Security-Policy: script-src 'self' 'unsafe-inline'
+Content-Security-Policy-Report-Only: script-src 'nonce-abc'; report-uri /reporting/resources/report.py?op=put&reportID={{$id}}
+Link: </content-security-policy/support/pass.js>;rel=preload;as=script;nonce=abc
diff --git a/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html b/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html
new file mode 100644
index 00000000000..7ed3123d291
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>A Report-Only policy with a nonce does not send a report for an allowed link preload</title>
+<script nonce="abc" src="/resources/testharness.js"></script>
+<script nonce="abc" src="/resources/testharnessreport.js"></script>
+<link nonce="abc" rel="preload" as="script" href="../support/pass.js">
+</head>
+<body>
+<script nonce="abc">
+var testName = "Report should not be sent for an allowed link preload";
+addEventListener("load", () => {
+    const script = document.createElement("script");
+    script.nonce = "abc";
+    script.src = `../support/checkReport.sub.js?reportExists=false&testName=${encodeURIComponent(testName)}`;
+
+    document.body.appendChild(script);
+});
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html.sub.headers b/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html.sub.headers
new file mode 100644
index 00000000000..0a1b3943608
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/reporting/link-preload-report-only-nonce.sub.html.sub.headers
@@ -0,0 +1,3 @@
+Set-Cookie: link-preload-report-only-nonce={{$id:uuid()}}; Path=/content-security-policy/reporting
+Content-Security-Policy: script-src 'self' 'unsafe-inline'
+Content-Security-Policy-Report-Only: script-src 'nonce-abc'; report-uri /reporting/resources/report.py?op=put&reportID={{$id}}
diff --git a/tests/wpt/tests/content-security-policy/support/pass.js b/tests/wpt/tests/content-security-policy/support/pass.js
new file mode 100644
index 00000000000..2e3702c685a
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/support/pass.js
@@ -0,0 +1 @@
+// intentionally left blank.
diff --git a/tests/wpt/tests/content-security-policy/xslt/document-function-blocked.html b/tests/wpt/tests/content-security-policy/xslt/document-function-blocked.html
new file mode 100644
index 00000000000..d81c4003f1a
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/document-function-blocked.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/content-security-policy/support/testharness-helper.js"></script>
+<body>
+<script>
+  async_test(t => {
+    let iframe = document.createElement("iframe");
+    iframe.src = "/content-security-policy/xslt/support/xml-with-stylesheet.xml";
+    document.body.append(iframe);
+
+    iframe.contentWindow.addEventListener("securitypolicyviolation", t.step_func_done(e => {
+        assert_true(e.blockedURI.endsWith("xslt/support/empty.xml"), "Blocked empty.xml request")
+    }));
+  }, "XSL document() function is blocked by CSP");
+</script>
+</body>
diff --git a/tests/wpt/tests/content-security-policy/xslt/support/document.xsl b/tests/wpt/tests/content-security-policy/xslt/support/document.xsl
new file mode 100644
index 00000000000..99511541f0a
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/support/document.xsl
@@ -0,0 +1,5 @@
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+  <xsl:template match="/">
+    <xsl:value-of select="document('/content-security-policy/xslt/support/empty.xml')//foo" />
+  </xsl:template>
+</xsl:stylesheet>
diff --git a/tests/wpt/tests/content-security-policy/xslt/support/empty.xml b/tests/wpt/tests/content-security-policy/xslt/support/empty.xml
new file mode 100644
index 00000000000..29862022257
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/support/empty.xml
@@ -0,0 +1,2 @@
+<?xml version="1.0" ?>
+<root/>
diff --git a/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml b/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml
new file mode 100644
index 00000000000..d6a515466dc
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml
@@ -0,0 +1,3 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/xsl" href="/content-security-policy/xslt/support/document.xsl"?>
+<root/>
diff --git a/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml.headers b/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml.headers
new file mode 100644
index 00000000000..72a99ace37c
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/support/xml-with-stylesheet.xml.headers
@@ -0,0 +1 @@
+Content-Security-Policy: connect-src 'none';
diff --git a/tests/wpt/tests/content-security-policy/xslt/xsltprocessor-include-blocked.html b/tests/wpt/tests/content-security-policy/xslt/xsltprocessor-include-blocked.html
new file mode 100644
index 00000000000..dbbe07f6e12
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/xslt/xsltprocessor-include-blocked.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<script nonce="abc" src="/resources/testharness.js"></script>
+<script nonce="abc" src="/resources/testharnessreport.js"></script>
+<script nonce="abc" src="/content-security-policy/support/testharness-helper.js"></script>
+<meta http-equiv="Content-Security-Policy" content="default-src 'none'; script-src 'nonce-abc';">
+<body>
+<script nonce="abc">
+  async_test(t => {
+    waitUntilEvent(window, "securitypolicyviolation").then(t.step_func_done(e => {
+      assert_equals(e.documentURI, document.location.toString());
+      assert_true(e.blockedURI.endsWith("/support/document.xsl"));
+    }));
+
+    const XSLT_DOC = `
+    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+      <xsl:include href="/content-security-policy/xslt/support/document.xsl" />
+      <xsl:template match="/">
+        <b>test</b>
+      </xsl:template>
+    </xsl:stylesheet>`;
+
+    const parser = new DOMParser();
+    const xmlDoc = parser.parseFromString(`<root/>`, "application/xml");
+    const xsltDoc = parser.parseFromString(XSLT_DOC, "application/xml");
+
+    try {
+      const xsltProcessor = new XSLTProcessor();
+      xsltProcessor.importStylesheet(xsltDoc);
+      xsltProcessor.transformToFragment(xmlDoc, document);
+    } catch {}
+  });
+</script>
+</body>
diff --git a/tests/wpt/tests/css/CSS2/generated-content/WEB_FEATURES.yml b/tests/wpt/tests/css/CSS2/generated-content/WEB_FEATURES.yml
new file mode 100644
index 00000000000..ac1cdafecc9
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/generated-content/WEB_FEATURES.yml
@@ -0,0 +1,92 @@
+features:
+- name: attr-contents
+  files:
+  - content-037.xht
+  - content-038.xht
+  - content-039.xht
+  - content-040.xht
+  - content-041.xht
+  - content-042.xht
+  - content-043.xht
+  - content-046.xht
+  - content-047.xht
+  - content-048.xht
+  - content-049.xht
+  - content-050.xht
+  - content-051.xht
+  - content-052.xht
+  - content-053.xht
+  - content-054.xht
+  - content-056.xht
+  - content-057.xht
+  - content-063.xht
+  - content-065.xht
+  - content-066.xht
+  - content-067.xht
+  - content-068.xht
+  - content-070.xht
+  - content-072.xht
+  - content-073.xht
+  - content-075.xht
+  - content-076.xht
+  - content-077.xht
+  - content-078.xht
+  - content-080.xht
+  - content-081.xht
+  - content-082.xht
+  - content-083.xht
+  - content-085.xht
+  - content-086.xht
+  - content-089.xht
+  - content-090.xht
+  - content-091.xht
+  - content-096.xht
+  - content-097.xht
+  - content-099.xht
+  - content-100.xht
+  - content-103.xht
+  - content-105.xht
+  - content-107.xht
+  - content-108.xht
+  - content-109.xht
+  - content-110.xht
+  - content-111.xht
+  - content-112.xht
+  - content-113.xht
+  - content-114.xht
+  - content-115.xht
+  - content-116.xht
+  - content-117.xht
+  - content-118.xht
+  - content-119.xht
+  - content-121.xht
+  - content-122.xht
+  - content-123.xht
+  - content-126.xht
+  - content-127.xht
+  - content-129.xht
+  - content-130.xht
+  - content-131.xht
+  - content-132.xht
+  - content-135.xht
+  - content-136.xht
+  - content-138.xht
+  - content-140.xht
+  - content-141.xht
+  - content-142.xht
+  - content-143.xht
+  - content-144.xht
+  - content-145.xht
+  - content-146.xht
+  - content-147.xht
+  - content-149.xht
+  - content-150.xht
+  - content-151.xht
+  - content-152.xht
+  - content-153.xht
+  - content-155.xht
+  - content-attr-001.xht
+  - content-attr-002.xht
+  - content-attr-case-001.html
+  - content-attr-case-002.xht
+  - other-attribute-001.xht
diff --git a/tests/wpt/tests/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html b/tests/wpt/tests/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html
index 59fca74f840..f634dd7fd99 100644
--- a/tests/wpt/tests/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html
+++ b/tests/wpt/tests/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html
@@ -8,7 +8,7 @@
         <link rel="reviewer" title="Mihai Țică" href="mailto:mitica@adobe.com">
         <link rel="help" href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode">
         <meta name="assert" content="Test checks that the element with mix-blend-mode blends with the parent element (both with 3D transform)">
-        <meta name="fuzzy" content="0-128;0-1000">
+        <meta name="fuzzy" content="0-180;0-1000">
         <link rel="match" href="reference/mix-blend-mode-both-parent-and-blended-with-3D-transform-ref.html">
         <style type="text/css">
             .parent {
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-to-sticky-003.html b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-to-sticky-003.html
index ac5e1c3c692..395d736afb4 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-scroll-to-sticky-003.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-scroll-to-sticky-003.html
@@ -2,7 +2,7 @@
 <title>Tests scroll adjustments of element anchored to a sticky-position element</title>
 <link rel="author" href="mailto:wangxianzhu@chromium.org">
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
-<link rel="match" href="reference/anchor-scroll-to-sticky-001-ref.html">
+<link rel="match" href="reference/anchor-scroll-to-sticky-003-ref.html">
 <style>
 body {
   margin: 0;
diff --git a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-003-ref.html b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-003-ref.html
new file mode 100644
index 00000000000..4856fa6d3b0
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-003-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<style>
+body {
+  margin: 0;
+}
+
+div {
+  width: 100px;
+  height: 100px;
+}
+
+#scroller {
+  overflow: scroll;
+}
+
+#anchor {
+  height: 20px;
+  background: orange;
+  position: relative;
+}
+
+#anchored {
+  position: absolute;
+  top: 20px;
+  left: 0;
+  background: green;
+}
+
+</style>
+
+<div id="anchored"></div>
+<div id="scroller">
+  <div style="height: 200px"></div>
+  <div id="anchor"></div>
+  <div style="height: 150px"></div>
+</div>
+
+<script>
+scroller.scrollTop = 200;
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-004-ref.html b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-004-ref.html
index d97b4ffc145..3b814d32ad0 100644
--- a/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-004-ref.html
+++ b/tests/wpt/tests/css/css-anchor-position/reference/anchor-scroll-to-sticky-004-ref.html
@@ -16,6 +16,7 @@ div {
 #anchor {
   height: 20px;
   background: orange;
+  position: relative;
 }
 
 #anchored {
@@ -27,12 +28,12 @@ div {
 
 </style>
 
+<div id="anchored"></div>
 <div id="scroller">
   <div style="height: 250px"></div>
   <div id="anchor"></div>
   <div style="height: 180px"></div>
 </div>
-<div id="anchored"></div>
 
 <script>
 scroller.scrollTop = 200;
diff --git a/tests/wpt/tests/css/css-animations/animation-duration-infinite-ref.html b/tests/wpt/tests/css/css-animations/animation-duration-infinite-ref.html
new file mode 100644
index 00000000000..a72dd6aef19
--- /dev/null
+++ b/tests/wpt/tests/css/css-animations/animation-duration-infinite-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<style>
+
+div {
+  width: 100px;
+  height: 100px;
+  background-color: black;
+}
+
+</style>
+<div></div>
diff --git a/tests/wpt/tests/css/css-animations/animation-duration-infinite.html b/tests/wpt/tests/css/css-animations/animation-duration-infinite.html
new file mode 100644
index 00000000000..cfe6dc0bcf4
--- /dev/null
+++ b/tests/wpt/tests/css/css-animations/animation-duration-infinite.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Setting 'animation-duration' to an infinite value should not hang</title>
+<link rel="author" title="Antoine Quint" href="mailto:graouts@webkit.org">
+<link rel="help" href="https://bugs.webkit.org/show_bug.cgi?id=297596">
+<link rel="match" href="animation-duration-infinite-ref.html">
+<meta name="assert" content="Setting 'animation-duration' to an infinite value should not hang">
+<style>
+
+div {
+  width: 100px;
+  height: 100px;
+  background-color: black;
+
+  animation-name: slide;
+  animation-duration: calc(infinity * 1s);
+}
+
+@keyframes slide {
+  to { margin-left: 100px }
+}
+
+</style>
+</head>
+<body>
+<div></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-backgrounds/table-cell-background-local-003.html b/tests/wpt/tests/css/css-backgrounds/table-cell-background-local-003.html
index 5641d3d41c0..e2662bec1fa 100644
--- a/tests/wpt/tests/css/css-backgrounds/table-cell-background-local-003.html
+++ b/tests/wpt/tests/css/css-backgrounds/table-cell-background-local-003.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 
   <meta charset="UTF-8">
-  <meta name="fuzzy" content="1;0-50">
+
   <title>CSS Backgrounds and Borders Test: table cell background-image with local attachment</title>
 
   <!--
diff --git a/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol-ref.html b/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol-ref.html
new file mode 100644
index 00000000000..80b7d191bd5
--- /dev/null
+++ b/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol-ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<p>"hahaha" should be seen below.</p>
+<div style="width:fit-content; columns:6; gap:0; column-fill:auto; line-height:20px; height:20px;">
+  h<br>a<br>h<br>a<br>h<br>a<br>
+</div>
diff --git a/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol.html b/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol.html
new file mode 100644
index 00000000000..e1eb6f9c19a
--- /dev/null
+++ b/tests/wpt/tests/css/css-break/table/repeated-section/text-in-nested-multicol.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/issues/435811611">
+<link rel="match" href="text-in-nested-multicol-ref.html">
+<p>"hahaha" should be seen below.</p>
+<div style="columns:3; width:fit-content; column-fill:auto; height:100px; gap:0; line-height:20px; orphans:1; widows:1;">
+  <div style="display:table;">
+    <div style="display:table-header-group; break-inside:avoid;">
+      <div style="columns:2; gap:0; column-fill:auto; height:20px;">
+        h<br>a<br>
+      </div>
+    </div>
+    <div style="height:200px;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html b/tests/wpt/tests/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html
new file mode 100644
index 00000000000..a32a38925d1
--- /dev/null
+++ b/tests/wpt/tests/css/css-conditional/container-queries/crashtests/chrome-bug-439886903-crash.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Chrome crash issue 439886903</title>
+<link rel="help" href="https://crbug.com/439886903">
+<html class="test-wait">
+<div id="container" style="container-type:inline-size">
+  <div id="target"></div>
+  <object id="svg" data='data:image/svg+xml,<?xml version="1.0"?><svg></svg>'></object>
+</div>
+<script type="module">
+  await new Promise(r => svg.addEventListener("load", r, { once: true }));
+  document.body.offsetTop;
+  container.style.width = "100px";
+  target.style.backgroundColor = "red";
+  document.body.offsetTop;
+  document.documentElement.classList.remove("test-wait");
+</script>
diff --git a/tests/wpt/tests/css/css-contain/contain-layout-ink-overflow-019.html b/tests/wpt/tests/css/css-contain/contain-layout-ink-overflow-019.html
index 5cda6cd5beb..d4909aa70f5 100644
--- a/tests/wpt/tests/css/css-contain/contain-layout-ink-overflow-019.html
+++ b/tests/wpt/tests/css/css-contain/contain-layout-ink-overflow-019.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 
   <meta charset="UTF-8">
-  <meta name="fuzzy" content="1;0-50">
 
   <title>CSS Test: 'contain: layout' on element that overflows and its parent has 'overflow: scroll'</title>
 
diff --git a/tests/wpt/tests/css/css-contain/contain-layout-overflow-001.html b/tests/wpt/tests/css/css-contain/contain-layout-overflow-001.html
index 05c66fa1e98..5bf984e2bf1 100644
--- a/tests/wpt/tests/css/css-contain/contain-layout-overflow-001.html
+++ b/tests/wpt/tests/css/css-contain/contain-layout-overflow-001.html
@@ -3,7 +3,6 @@
 <html>
 <head>
   <meta charset="utf-8">
-  <meta name="fuzzy" content="1;0-50">
   <title>CSS Test: 'contain: layout' should force all overflow to be ink overflow.</title>
   <link rel="author" title="Morgan Rae Reschenberg" href="mailto:mreschenberg@berkeley.edu">
   <link rel="help" href="https://drafts.csswg.org/css-contain/#containment-layout">
diff --git a/tests/wpt/tests/css/css-content/WEB_FEATURES.yml b/tests/wpt/tests/css/css-content/WEB_FEATURES.yml
index 793c126ceae..2fb47c4c6e5 100644
--- a/tests/wpt/tests/css/css-content/WEB_FEATURES.yml
+++ b/tests/wpt/tests/css/css-content/WEB_FEATURES.yml
@@ -1,4 +1,9 @@
 features:
+- name: attr-contents
+  files:
+  - attr-case-sensitivity-001.html
+  - attr-case-sensitivity-002.html
+  - attr-case-sensitivity-003.html
 - name: quotes
   files:
   - quotes-*
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-invalid.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-invalid.html
index 9f9f173375d..ee9fbb53310 100644
--- a/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-invalid.html
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-columns-invalid.html
@@ -30,6 +30,26 @@ test_invalid_value("grid-template-columns", '-5fr repeat(auto-fill, auto)');
 test_invalid_value("grid-template-columns", '-10px repeat(auto-fill, min-content)');
 test_invalid_value("grid-template-columns", '-20% repeat(auto-fit, max-content)');
 test_invalid_value("grid-template-columns", 'repeat(auto-fill, fit-content)');
+test_invalid_value("grid-template-columns", 'auto repeat(auto-fill, auto) auto');
+test_invalid_value("grid-template-columns", 'min-content repeat(auto-fill, auto) min-content');
+test_invalid_value("grid-template-columns", 'max-content repeat(auto-fill, auto) max-content');
+test_invalid_value("grid-template-columns", 'fit-content(200px) repeat(auto-fill, auto) fit-content(200px)');
+test_invalid_value("grid-template-columns", 'auto repeat(auto-fill, auto) repeat(5, auto)');
+test_invalid_value("grid-template-columns", 'auto repeat(auto-fill, min-content) auto');
+test_invalid_value("grid-template-columns", 'min-content repeat(auto-fill, min-content) min-content');
+test_invalid_value("grid-template-columns", 'max-content repeat(auto-fill, min-content) max-content');
+test_invalid_value("grid-template-columns", 'fit-content(200px) repeat(auto-fill, min-content) fit-content(200px)');
+test_invalid_value("grid-template-columns", 'min-content repeat(auto-fill, min-content) repeat(5, min-content)');
+test_invalid_value("grid-template-columns", 'auto repeat(auto-fill, max-content) auto');
+test_invalid_value("grid-template-columns", 'min-content repeat(auto-fill, max-content) min-content');
+test_invalid_value("grid-template-columns", 'max-content repeat(auto-fill, max-content) max-content');
+test_invalid_value("grid-template-columns", 'fit-content(200px) repeat(auto-fill, max-content) fit-content(200px)');
+test_invalid_value("grid-template-columns", 'max-content repeat(auto-fill, max-content) repeat(5, max-content)');
+test_invalid_value("grid-template-columns", 'auto repeat(auto-fill, fit-content(200px)) auto');
+test_invalid_value("grid-template-columns", 'min-content repeat(auto-fill, fit-content(200px)) min-content');
+test_invalid_value("grid-template-columns", 'max-content repeat(auto-fill, fit-content(200px)) max-content');
+test_invalid_value("grid-template-columns", 'fit-content(200px) repeat(auto-fill, fit-content(200px)) fit-content(200px)');
+test_invalid_value("grid-template-columns", 'fit-content(200px) repeat(auto-fill, fit-content(200px)) repeat(5, fit-content(200px))');
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-invalid.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-invalid.html
index 192b392d02c..78468f83f32 100644
--- a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-invalid.html
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-invalid.html
@@ -30,6 +30,26 @@ test_invalid_value("grid-template-rows", '-10px repeat(auto-fit, auto)');
 test_invalid_value("grid-template-rows", '-10px repeat(auto-fill, min-content)');
 test_invalid_value("grid-template-rows", '-20% repeat(auto-fit, max-content)');
 test_invalid_value("grid-template-rows", 'repeat(auto-fill, fit-content)');
+test_invalid_value("grid-template-rows", 'auto repeat(auto-fill, auto) auto');
+test_invalid_value("grid-template-rows", 'min-content repeat(auto-fill, auto) min-content');
+test_invalid_value("grid-template-rows", 'max-content repeat(auto-fill, auto) max-content');
+test_invalid_value("grid-template-rows", 'fit-content(200px) repeat(auto-fill, auto) fit-content(200px)');
+test_invalid_value("grid-template-rows", 'auto repeat(auto-fill, auto) repeat(5, auto)');
+test_invalid_value("grid-template-rows", 'auto repeat(auto-fill, min-content) auto');
+test_invalid_value("grid-template-rows", 'min-content repeat(auto-fill, min-content) min-content');
+test_invalid_value("grid-template-rows", 'max-content repeat(auto-fill, min-content) max-content');
+test_invalid_value("grid-template-rows", 'fit-content(200px) repeat(auto-fill, min-content) fit-content(200px)');
+test_invalid_value("grid-template-rows", 'min-content repeat(auto-fill, min-content) repeat(5, min-content)');
+test_invalid_value("grid-template-rows", 'auto repeat(auto-fill, max-content) auto');
+test_invalid_value("grid-template-rows", 'min-content repeat(auto-fill, max-content) min-content');
+test_invalid_value("grid-template-rows", 'max-content repeat(auto-fill, max-content) max-content');
+test_invalid_value("grid-template-rows", 'fit-content(200px) repeat(auto-fill, max-content) fit-content(200px)');
+test_invalid_value("grid-template-rows", 'max-content repeat(auto-fill, max-content) repeat(5, max-content)');
+test_invalid_value("grid-template-rows", 'auto repeat(auto-fill, fit-content(200px)) auto');
+test_invalid_value("grid-template-rows", 'min-content repeat(auto-fill, fit-content(200px)) min-content');
+test_invalid_value("grid-template-rows", 'max-content repeat(auto-fill, fit-content(200px)) max-content');
+test_invalid_value("grid-template-rows", 'fit-content(200px) repeat(auto-fill, fit-content(200px)) fit-content(200px)');
+test_invalid_value("grid-template-rows", 'fit-content(200px) repeat(auto-fill, fit-content(200px)) repeat(5, fit-content(200px))');
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-repeat-intrinsic-valid.tentative.html b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-repeat-intrinsic-valid.tentative.html
index a3975eb4007..32f8df97970 100644
--- a/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-repeat-intrinsic-valid.tentative.html
+++ b/tests/wpt/tests/css/css-grid/parsing/grid-template-rows-repeat-intrinsic-valid.tentative.html
@@ -28,12 +28,10 @@ test_valid_value("grid-template-rows", 'repeat(auto-fit, max-content 100px max-c
 test_valid_value("grid-template-rows", 'repeat(auto-fill, minmax(30px, 5fr) [two] max-content)');
 test_valid_value("grid-template-rows", 'repeat(auto-fit, [three] max-content [four])');
 
-
 test_valid_value("grid-template-rows", 'repeat(auto-fill, fit-content(200px))');
 test_valid_value("grid-template-rows", 'repeat(auto-fit, fit-content(200px) 100px fit-content(200px))');
 test_valid_value("grid-template-rows", 'repeat(auto-fill, minmax(30px, 5fr) [two] fit-content(200px))');
 test_valid_value("grid-template-rows", 'repeat(auto-fit, [three] fit-content(200px) [four])');
 </script>
-</script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-highlight-api/crashtests/highlight-first-letter-float-crash.html b/tests/wpt/tests/css/css-highlight-api/crashtests/highlight-first-letter-float-crash.html
new file mode 100644
index 00000000000..ea374295496
--- /dev/null
+++ b/tests/wpt/tests/css/css-highlight-api/crashtests/highlight-first-letter-float-crash.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html contenteditable>
+<style>
+div::first-letter {
+  float: right;
+}
+::highlight(test) { background-color: purple; }
+</style>
+<div><span id="span1">a<span>bc</span></span></div>
+<script>
+const span1 = document.getElementById("span1");
+const text_node = span1.firstChild;
+const range = document.createRange();
+range.setStart(text_node, 0);
+range.setEnd(text_node, 1);
+const highlight = new Highlight(range);
+CSS.highlights.set("test", highlight);
+</script>
diff --git a/tests/wpt/tests/css/css-masking/clip/clip-not-absolute-positioned-003.html b/tests/wpt/tests/css/css-masking/clip/clip-not-absolute-positioned-003.html
index ee3765db7ac..f6842c50edf 100644
--- a/tests/wpt/tests/css/css-masking/clip/clip-not-absolute-positioned-003.html
+++ b/tests/wpt/tests/css/css-masking/clip/clip-not-absolute-positioned-003.html
@@ -5,15 +5,14 @@
     <link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com">
     <link rel="help" href="http://www.w3.org/TR/css-masking-1/#clipping-paths">
     <link rel="help" href="http://www.w3.org/TR/css-masking-1/#clip-property">
-    <link rel="match" href="reference/clip-no-clipping-ref.html">
+    <link rel="match" href="reference/clip-no-clipping-no-text-ref.html">
     <meta name="assert" content="The clip property should be ignored on
     elements whose layout are governed by the CSS box model and are not
-    abolutely positioned. Creating a 3d rednering context does not influence
+    abolutely positioned. Creating a 3d rendering context does not influence
     clipping behavior. On pass you should see a green square with a blue
     border.">
 </head>
 <body style="perspective: 400px;">
-    <p>The test passes if there is a green square with a blue border.</p>
     <div style="width: 100px; height: 100px; border: solid blue 50px; background-color: green; transform-style: preserve-3d; transform: translate3d(0, 0, 0); clip: rect(50px, 150px, 150px, 50px);"></div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/tests/css/css-masking/clip/reference/clip-no-clipping-no-text-ref.html b/tests/wpt/tests/css/css-masking/clip/reference/clip-no-clipping-no-text-ref.html
new file mode 100644
index 00000000000..5f23acf9660
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/clip/reference/clip-no-clipping-no-text-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSS Reftest Reference</title>
+    <link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com">
+</head>
+<body>
+    <div style="width: 100px; height: 100px; border: solid blue 50px; background-color: green;"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-mixins/cssom.tentative.html b/tests/wpt/tests/css/css-mixins/cssom.tentative.html
new file mode 100644
index 00000000000..945e25079b5
--- /dev/null
+++ b/tests/wpt/tests/css/css-mixins/cssom.tentative.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Mixins: CSSOM support</title>
+    <link rel="help" href="https://drafts.csswg.org/css-mixins/#cssom">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+       @mixin --m1() {
+         color: green;
+         & {
+           --foo: bar;
+         }
+       }
+       #foo {
+         @apply --m1;
+       }
+
+       @mixin --m2(@contents) {
+         @contents
+       }
+       #foo {
+         color: red;
+         @apply --m2 { color: green; }
+       }
+     </style>
+   </head>
+   <body>
+     <div id="target"></div>
+     <script>
+        let ss = document.styleSheets[0];
+
+        test(() => {
+          assert_equals(ss.cssRules.length, 4);
+          assert_equals(ss.cssRules[0].cssText,
+`@mixin --m1() {
+  color: green;
+  & { --foo: bar; }
+}`);
+        }, 'serialization of @mixin');
+
+        test(() => {
+          assert_equals(ss.cssRules[1].cssText,
+`#foo {
+  @apply --m1;
+}`);
+        }, 'serialization of rule with @apply');
+
+        test(() => {
+          assert_equals(ss.cssRules[2].cssText,
+`@mixin --m2(@contents) {
+  @contents;
+}`);
+        }, 'serialization of @mixin with @contents');
+
+        test(() => {
+          assert_equals(ss.cssRules[3].cssText,
+`#foo {
+  color: red;
+  @apply --m2 { color: green; }
+}`);
+        }, 'serialization of rule with @apply and contents argument');
+
+        test(() => {
+          assert_throws_dom('SyntaxError', () => {
+            ss.insertRule('@apply --m1();');
+          });
+        }, '@apply is not legal at top level');
+     </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-mixins/invalid-at-top-level.html b/tests/wpt/tests/css/css-mixins/invalid-at-top-level.html
new file mode 100644
index 00000000000..87296527bd9
--- /dev/null
+++ b/tests/wpt/tests/css/css-mixins/invalid-at-top-level.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Mixins: @apply is invalid at top level</title>
+    <link rel="help" href="https://drafts.csswg.org/css-mixins-1/#apply-rule">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+      .cls {
+        color: green;
+      }
+      @mixin --m1() {
+        .cls {
+          color: red;
+        }
+      }
+      @apply --m1;
+    </style>
+  </head>
+  <body>
+    <div><div class="cls" id="target">This text should be green.</div></div>
+    <script>
+      test(() => {
+        let target = document.getElementById('target');
+        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+      });
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-mixins/invalidation.tentative.html b/tests/wpt/tests/css/css-mixins/invalidation.tentative.html
new file mode 100644
index 00000000000..d70fb29d447
--- /dev/null
+++ b/tests/wpt/tests/css/css-mixins/invalidation.tentative.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Mixins: Invalidation after CSSOM changes</title>
+    <link rel="help" href="https://drafts.csswg.org/css-mixins/#cssom">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+       @mixin --m1() {
+         color: red;
+         & {
+           --foo: bar;
+         }
+       }
+       @mixin --m2() {
+         color: red;
+       }
+       #target1 {
+         @apply --m1;
+       }
+     </style>
+    <style>
+       #target2 {
+         @apply --m2;
+       }
+     </style>
+     <style>
+       @mixin --m3() {
+         color: green;
+       }
+       #target3 {
+         color: red;
+       }
+     </style>
+   </head>
+   <body>
+     <div id="target1">Some text.</div>
+     <div id="target2">Some text.</div>
+     <div id="target3">Some text.</div>
+     <script>
+        test(() => {
+          let ss = document.styleSheets[0];
+          assert_equals(ss.cssRules[0].name, '--m1');
+          assert_equals(ss.cssRules[0].cssRules.length, 2);
+          let target = document.getElementById('target1');
+
+          assert_equals(getComputedStyle(target).color, 'rgb(255, 0, 0)');
+          ss.cssRules[0].cssRules[1].style.color = 'green';
+          assert_equals(ss.cssRules[0].cssText,
+`@mixin --m1() {
+  color: red;
+  & { --foo: bar; color: green; }
+}`);
+          assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+        }, 'invalidation of @mixin from same stylesheet');
+
+        test(() => {
+          let ss = document.styleSheets[0];
+          assert_equals(ss.cssRules[1].name, '--m2');
+          let target = document.getElementById('target2');
+
+          assert_equals(getComputedStyle(target).color, 'rgb(255, 0, 0)');
+          ss.cssRules[1].cssRules[0].style.color = 'green';
+          assert_equals(ss.cssRules[1].cssText,
+`@mixin --m2() {
+  color: green;
+}`);
+          assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+        }, 'invalidation of @mixin from different stylesheet');
+
+        test(() => {
+          let ss = document.styleSheets[2];
+          let target = document.getElementById('target3');
+
+          assert_equals(getComputedStyle(target).color, 'rgb(255, 0, 0)');
+          ss.cssRules[1].insertRule('@apply --m3;');
+          assert_equals(ss.cssRules[1].cssText,
+`#target3 {
+  color: red;
+  @apply --m3;
+}`);
+          assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+        }, 'invalidation on adding @apply rule');
+     </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-mixins/media-queries.html b/tests/wpt/tests/css/css-mixins/media-queries.html
new file mode 100644
index 00000000000..239b9ed61c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-mixins/media-queries.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+  <head>
+    <title>CSS Mixins: Media Queries and invalidation</title>
+    <link rel="help" href="https://drafts.csswg.org/css-mixins/#mixin-rule">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <iframe id="iframe" width="500" height="300" srcdoc="
+      <style>
+        @mixin --m1() {
+          color: tomato;
+        }
+        @media (width >= 50px) {
+          @mixin --m1() {
+            color: cornsilk;
+          }
+        }
+        @media (width < 50px) {
+          @mixin --m1() {
+            color: mediumvioletred;
+          }
+        }
+      </style>
+      <style>
+        /* Invalidated by a mixin in a different style sheet. */
+        #target {
+          @apply --m1;
+        }
+      </style>
+      <div id='target'>Text should be a different color when narrowed.</div>
+    "></iframe>
+    <script>
+      promise_test(async () => {
+        await new Promise(r => iframe.addEventListener('load', r));
+
+        let target = iframe.contentDocument.getElementById('target');
+        assert_equals(getComputedStyle(target).color, "rgb(255, 248, 220)");  // cornsilk
+        iframe.width = 30;
+        assert_equals(getComputedStyle(target).color, "rgb(199, 21, 133)");  // mediumvioletred
+      });
+    </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/animation/column-wrap-reset-interpolation.html b/tests/wpt/tests/css/css-multicol/animation/column-wrap-reset-interpolation.html
new file mode 100644
index 00000000000..8acbef8adde
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/animation/column-wrap-reset-interpolation.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>Test that 'column-wrap' is part of the 'columns' shorthand for animations</title>
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-column-wrap">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  .multicol {
+    columns: 100px / 100px;
+    column-wrap: nowrap;
+    transition: columns 2s allow-discrete;
+  }
+  #mid {
+    transition-delay: -1s;
+  }
+  #end {
+    transition-delay: -2s;
+  }
+</style>
+<div id="start" class="multicol"></div>
+<div id="mid" class="multicol"></div>
+<div id="end" class="multicol"></div>
+<script>
+  test(()=> {
+    assert_equals(getComputedStyle(start).columnWrap, "nowrap");
+    assert_equals(getComputedStyle(mid).columnWrap, "nowrap");
+    assert_equals(getComputedStyle(end).columnWrap, "nowrap");
+
+    document.querySelectorAll(".multicol").forEach(elm => {
+      // Set `columns` to the same as before.
+      // This should reset `column-wrap` to `auto`.
+      elm.style.columns = '100px / 100px';
+    });
+
+    assert_equals(getComputedStyle(start).columnWrap, "nowrap");
+    assert_equals(getComputedStyle(mid).columnWrap, "auto");
+    assert_equals(getComputedStyle(end).columnWrap, "auto");
+  }, "Animate and reset column-wrap");
+</script>
diff --git a/tests/wpt/tests/css/css-multicol/animation/columns-interpolation.html b/tests/wpt/tests/css/css-multicol/animation/columns-interpolation.html
new file mode 100644
index 00000000000..869210f8fcd
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/animation/columns-interpolation.html
@@ -0,0 +1,136 @@
+<!DOCTYPE html>
+<title>columns shorthand interpolation</title>
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+<style>
+  .parent {
+    columns: 50px / 100px;
+  }
+  .target {
+    columns: 200px / 100px;
+  }
+</style>
+<body>
+</body>
+<script>
+test_interpolation({
+  property: 'columns',
+  from: '200px 10',
+  to: '100px 20',
+}, [
+  {at: -1, expect: '300px 1'},
+  {at: -0.5, expect: '250px 5'},
+  {at: 0, expect: '200px 10'},
+  {at: 0.5, expect: '150px 15'},
+  {at: 1, expect: '100px 20'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: neutralKeyframe,
+  to: '100px / 200px',
+}, [
+  {at: -1, expect: '300px / 0px'},
+  {at: -0.5, expect: '250px / 50px'},
+  {at: 0, expect: '200px / 100px'},
+  {at: 0.5, expect: '150px / 150px'},
+  {at: 1, expect: '100px / 200px'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: '1000px / 500px',
+  to: '100px / 200px',
+}, [
+  {at: -1, expect: '1900px / 800px'},
+  {at: -0.5, expect: '1450px / 650px'},
+  {at: 0, expect: '1000px / 500px'},
+  {at: 0.5, expect: '550px / 350px'},
+  {at: 1, expect: '100px / 200px'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: '10 / 100px',
+  to: '20 / 200px',
+}, [
+  {at: -0.5, expect: '5 / 50px'},
+  {at: 0, expect: '10 / 100px'},
+  {at: 0.5, expect: '15 / 150px'},
+  {at: 1, expect: '20 / 200px'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: '10 100px',
+  to: '20 200px',
+}, [
+  {at: -0.5, expect: '5 50px'},
+  {at: 0, expect: '10 100px'},
+  {at: 0.5, expect: '15 150px'},
+  {at: 1, expect: '20 200px'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: '10 100px / auto',
+  to: '20 200px / auto',
+}, [
+  {at: -0.5, expect: '5 50px'},
+  {at: 0, expect: '10 100px'},
+  {at: 0.5, expect: '15 150px'},
+  {at: 1, expect: '20 200px'},
+]);
+
+test_interpolation({
+  property: 'columns',
+  from: 'inherit',
+  to: '200px / 900px',
+}, [
+  {at: -0.5, expect: '0px / 0px'},
+  {at: -0.2, expect: '20px / 0px'},
+  {at: -0.1, expect: '35px / 20px'},
+  {at: 0, expect: '50px / 100px'},
+  {at: 0.5, expect: '125px / 500px'},
+  {at: 1, expect: '200px / 900px'},
+]);
+
+test_no_interpolation({
+  property: 'columns',
+  from: 'initial',
+  to: '100px / 200px',
+});
+
+test_no_interpolation({
+  property: 'columns',
+  from: 'initial',
+  to: '100px',
+});
+
+test_no_interpolation({
+  property: 'columns',
+  from: 'initial',
+  to: '10',
+});
+
+test_no_interpolation({
+  property: 'columns',
+  from: 'auto',
+  to: '100px / 200px',
+});
+
+test_no_interpolation({
+  property: 'columns',
+  from: '100px / 200px',
+  to: 'auto',
+});
+
+test_no_interpolation({
+  property: 'columns',
+  from: 'inherit',
+  to: 'auto',
+});
+</script>
diff --git a/tests/wpt/tests/css/css-multicol/animation/discrete-no-interpolation.html b/tests/wpt/tests/css/css-multicol/animation/discrete-no-interpolation.html
index 6572fd503fd..bfb97cd3087 100644
--- a/tests/wpt/tests/css/css-multicol/animation/discrete-no-interpolation.html
+++ b/tests/wpt/tests/css/css-multicol/animation/discrete-no-interpolation.html
@@ -24,4 +24,10 @@ test_no_interpolation({
   from: 'initial',
   to: 'all'
 });
+
+test_no_interpolation({
+  property: 'column-wrap',
+  from: 'wrap',
+  to: 'nowrap'
+});
 </script>
diff --git a/tests/wpt/tests/css/css-multicol/columns-shorthand-reset-wrap.html b/tests/wpt/tests/css/css-multicol/columns-shorthand-reset-wrap.html
new file mode 100644
index 00000000000..0daa569516a
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/columns-shorthand-reset-wrap.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<title>Test that 'column-wrap' is reset by the 'columns' shorthand</title>
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-column-wrap">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style id="style">
+  #multicol1 {
+    columns: 100px / 100px;
+  }
+  #multicol2 {
+    column-wrap: nowrap;
+    columns: 100px / 100px;
+  }
+  #multicol3 {
+    columns: 100px / 100px;
+    column-wrap: nowrap;
+  }
+</style>
+<div id="multicol1"></div>
+<div id="multicol2"></div>
+<div id="multicol3"></div>
+<script>
+  let sheet = style.sheet;
+
+  test(()=> {
+    let rule = sheet.rules[0];
+    assert_equals(rule.selectorText, "#multicol1");
+    assert_equals(rule.style.columnWrap, "auto");
+    assert_equals(getComputedStyle(multicol1).columnWrap, "auto");
+  }, "multicol1");
+
+  test(()=> {
+    let rule = sheet.rules[1];
+    assert_equals(rule.selectorText, "#multicol2");
+    assert_equals(rule.style.columnWrap, "auto");
+    assert_equals(getComputedStyle(multicol2).columnWrap, "auto");
+  }, "multicol2");
+
+  test(()=> {
+    let rule = sheet.rules[2];
+    assert_equals(rule.selectorText, "#multicol3");
+    assert_equals(rule.style.columnWrap, "nowrap");
+    assert_equals(getComputedStyle(multicol3).columnWrap, "nowrap");
+  }, "multicol3");
+</script>
diff --git a/tests/wpt/tests/css/css-multicol/multicol-on-broken-image-alt-text.html b/tests/wpt/tests/css/css-multicol/multicol-on-broken-image-alt-text.html
new file mode 100644
index 00000000000..46e8423b3f2
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/multicol-on-broken-image-alt-text.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/issues/40747770">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square.xht">
+<style>
+  img {
+    columns: 5;
+    line-height: 20px;
+    orphans: 1;
+    widows: 1;
+    color: red;
+    background: red;
+  }
+</style>
+<script>
+  // Wait for image loading to fail.
+  document.documentElement.className = "reftest-wait";
+  onload = function() {
+    document.documentElement.classList.remove("reftest-wait");
+  }
+</script>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="position:absolute; z-index:1; width:100px; height:100px; background:green;"></div>
+<div style="width:100px; height:100px;">
+  <img alt="XXXXX XXXXX XXXXX XXXXX XXXXX" src="invalid.jpg" width="300" height="200">
+</div>
diff --git a/tests/wpt/tests/css/css-multicol/parsing/columns-computed.html b/tests/wpt/tests/css/css-multicol/parsing/columns-computed.html
new file mode 100644
index 00000000000..e67cdd00ed3
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/parsing/columns-computed.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>CSS Multi-column Layout: getComputedStyle().columns</title>
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<meta name="assert" content="The 'columns' shorthand property computes to the correct serialization of its component values, with lengths made absolute.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<div id="target"></div>
+<style>
+  #target {
+    font-size: 40px;
+  }
+</style>
+<script>
+  test_computed_value("columns", "auto");
+
+  test_computed_value("columns", "0.25em", "10px");
+  test_computed_value("columns", "2", "2");
+  test_computed_value("columns", "0.25em 2", "10px 2");
+  test_computed_value("columns", "2 0.25em", "10px 2");
+  test_computed_value("columns", "0.25em auto", "10px");
+  test_computed_value("columns", "auto 0.25em", "10px");
+  test_computed_value("columns", "2 auto", "2");
+  test_computed_value("columns", "auto 2", "2");
+
+  test_computed_value("columns", "auto / 2.5em", "auto / 100px");
+  test_computed_value("columns", "0.25em / 2.5em", "10px / 100px");
+  test_computed_value("columns", "2 / 2.5em", "2 / 100px");
+  test_computed_value("columns", "0.25em 2 / 2.5em", "10px 2 / 100px");
+  test_computed_value("columns", "2 0.25em / 2.5em", "10px 2 / 100px");
+  test_computed_value("columns", "0.25em auto / 2.5em", "10px / 100px");
+  test_computed_value("columns", "auto 0.25em / 2.5em", "10px / 100px");
+  test_computed_value("columns", "2 auto / 2.5em", "2 / 100px");
+  test_computed_value("columns", "auto 2 / 2.5em", "2 / 100px");
+
+  test_computed_value("columns", "auto / auto", "auto");
+  test_computed_value("columns", "0.25em / auto", "10px");
+  test_computed_value("columns", "2 / auto", "2");
+  test_computed_value("columns", "0.25em 2 / auto", "10px 2");
+  test_computed_value("columns", "2 0.25em / auto", "10px 2");
+  test_computed_value("columns", "0.25em auto / auto", "10px");
+  test_computed_value("columns", "auto 0.25em / auto", "10px");
+  test_computed_value("columns", "2 auto / auto", "2");
+  test_computed_value("columns", "auto 2 / auto", "2");
+</script>
diff --git a/tests/wpt/tests/css/css-multicol/parsing/columns-invalid.html b/tests/wpt/tests/css/css-multicol/parsing/columns-invalid.html
index dc9b27bf375..f6bb3982900 100644
--- a/tests/wpt/tests/css/css-multicol/parsing/columns-invalid.html
+++ b/tests/wpt/tests/css/css-multicol/parsing/columns-invalid.html
@@ -4,7 +4,8 @@
 <meta charset="utf-8">
 <title>CSS Multi-column Layout: parsing columns with invalid values</title>
 <link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
-<meta name="assert" content="columns supports only the grammar '<column-width> || <column-count>'.">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<meta name="assert" content="columns supports only the grammar '[ <'column-width'> || <'column-count'> ] [ / <'column-height'> ]?'.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
@@ -27,6 +28,17 @@ test_invalid_value("columns", "auto auto auto");
 test_invalid_value("columns", "10em auto auto");
 test_invalid_value("columns", "initial initial");
 test_invalid_value("columns", "inherit inherit");
+
+// With "/ <'column-height'>"
+test_invalid_value("columns", "/ 100px");
+test_invalid_value("columns", "/ auto");
+test_invalid_value("columns", "/");
+test_invalid_value("columns", "auto /");
+test_invalid_value("columns", "100px /");
+test_invalid_value("columns", "2 /");
+test_invalid_value("columns", "2 100px /");
+test_invalid_value("columns", "100px 2 /");
+
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-multicol/parsing/columns-valid.html b/tests/wpt/tests/css/css-multicol/parsing/columns-valid.html
index 7b643e2d9a3..4dd8895dbee 100644
--- a/tests/wpt/tests/css/css-multicol/parsing/columns-valid.html
+++ b/tests/wpt/tests/css/css-multicol/parsing/columns-valid.html
@@ -4,7 +4,8 @@
 <meta charset="utf-8">
 <title>CSS Multi-column Layout: parsing columns with valid values</title>
 <link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
-<meta name="assert" content="columns supports the full grammar '<column-width> || <column-count>'.">
+<link rel="help" href="https://drafts.csswg.org/css-multicol-2/#propdef-columns">
+<meta name="assert" content="columns supports the full grammar '[ <'column-width'> || <'column-count'> ] [ / <'column-height'> ]?'.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
@@ -27,6 +28,17 @@ test_valid_value("columns", "0 1", "0px 1");
 test_valid_value("columns", "1 0", "0px 1");
 test_valid_value("columns", "0px 1");
 
+// With "/ <'column-height'>"
+test_valid_value("columns", "10px 2 / 100px");
+test_valid_value("columns", "2 10px / 100px", "10px 2 / 100px");
+test_valid_value("columns", "10px / 100px");
+test_valid_value("columns", "auto / 100px");
+test_valid_value("columns", "10px 2 / auto", "10px 2");
+test_valid_value("columns", "2 10px / auto", "10px 2");
+test_valid_value("columns", "10px / auto", "10px");
+test_valid_value("columns", "2 / auto", "2");
+test_valid_value("columns", "auto / auto", "auto");
+
 // CSS-wide keywords.
 test_valid_value("columns", "initial");
 test_valid_value("columns", "inherit");
diff --git a/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-001.html b/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-001.html
index 1b58803079f..47531c7c8d8 100644
--- a/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-001.html
+++ b/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-001.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<html class="reftest-wait">
 <meta charset="utf-8">
 <title>CSS Overflow Test: Test the text in an input is not clipped and reachable</title>
 <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
@@ -23,6 +24,8 @@ input {
      width (160px) to reproduce this bug.  -->
 <input id="input" value="X  XpX">
 
-<script>
-document.getElementById('input').scrollLeft = 1000;
+<script type="module">
+  await document.fonts.load('20px/1 Ahem');
+  document.getElementById('input').scrollLeft = 1000;
+  document.documentElement.classList.remove("reftest-wait");
 </script>
diff --git a/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-002.html b/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-002.html
index 3efebf0b90d..3cb9756dfad 100644
--- a/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-002.html
+++ b/tests/wpt/tests/css/css-overflow/scrollable-overflow-input-002.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<html class="reftest-wait">
 <meta charset="utf-8">
 <title>CSS Overflow Test: Test the text in an input is not clipped and reachable</title>
 <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
@@ -24,6 +25,8 @@ input {
      width (160px) to reproduce this bug.  -->
 <input id="input2" value="XpX  X">
 
-<script>
-document.getElementById('input2').scrollLeft = -1000;
+<script type="module">
+  await document.fonts.load('20px/1 Ahem');
+  document.getElementById('input2').scrollLeft = -1000;
+  document.documentElement.classList.remove("reftest-wait");
 </script>
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-002.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-002.html
index 73c10dc7b3f..129eb2c0859 100644
--- a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-002.html
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-002.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html>
   <meta charset="utf-8">
-  <meta name="fuzzy" content="1-20;0-50">
   <title>CSS Overflow: test scrollbar-gutter with horizontal left to right content</title>
   <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-lr-002.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-lr-002.html
index 598cfdf3664..9e5dcd299eb 100644
--- a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-lr-002.html
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-lr-002.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html>
   <meta charset="utf-8">
-  <meta name="fuzzy" content="1-25;0-50">
   <title>CSS Overflow: test scrollbar-gutter with vertical left to right content</title>
   <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-rl-002.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-rl-002.html
index 398751845cf..d68d4e5d3cb 100644
--- a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-rl-002.html
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-vertical-rl-002.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html>
   <meta charset="utf-8">
-  <meta name="fuzzy" content="1;0-50">
   <title>CSS Overflow: test scrollbar-gutter with vertical right to left content</title>
   <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
diff --git a/tests/wpt/tests/css/css-position/sticky/position-sticky-in-fixed-container.html b/tests/wpt/tests/css/css-position/sticky/position-sticky-in-fixed-container.html
index 75c2d67259e..359ec2fd337 100644
--- a/tests/wpt/tests/css/css-position/sticky/position-sticky-in-fixed-container.html
+++ b/tests/wpt/tests/css/css-position/sticky/position-sticky-in-fixed-container.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width,initial-scale=1">
-<meta name="fuzzy" content="1;0-50">
 <link rel="match" href="position-sticky-in-fixed-container-ref.html">
 <link rel="help" href="https://drafts.csswg.org/css-position-3/#sticky-pos">
 <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1854010">
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/reference/shape-outside-linear-gradient-horizontal-rtl-ref.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/reference/shape-outside-linear-gradient-horizontal-rtl-ref.html
new file mode 100644
index 00000000000..a5750089015
--- /dev/null
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/reference/shape-outside-linear-gradient-horizontal-rtl-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>CSS Reference File</title>
+    <link rel="stylesheet" href="/fonts/ahem.css">
+    <style>
+        body {
+            overflow: hidden;
+        }
+        div {
+            width: 50px;
+            height: 200px;
+            position: relative;
+        }
+        .non-gradient-box {
+            background-color: green;
+        }
+        .gradient-box {
+            width: 100px;
+            background: linear-gradient(to right, green 50%, transparent 50%);
+        }
+    </style>
+</head>
+<body>
+    <p>
+        The test passes if you see a green square. There should be no red.
+    </p>
+    <div class="gradient-box"></div>
+    <div class="non-gradient-box" style="left: 50px; top: -200px"></div>
+    <div class="non-gradient-box" style="top: -200px"></div>
+    <div class="gradient-box" style="top: -400px; left: 50px;"></div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-005.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-005.html
index 6d0fc21361b..2f6823ac6db 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-005.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-005.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=7600-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under vertical-rl."/>
     <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-006.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-006.html
index 68243e0ab8f..e0a180d6877 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-006.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-006.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=7600-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under vertical-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-007.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-007.html
index 4ef0b6b5dfe..1eca566a0b4 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-007.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-007.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=7600-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under sideways-rl."/>
     <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-009.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-009.html
index 50c80d0ac76..e3ebf3c29d6 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-009.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-009.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=7600-8700" />
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under vertical-rl and text-orientation: sideways."/>
     <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-010.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-010.html
index 1e245cb285c..ca24c1a0147 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-010.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-010.html
@@ -9,6 +9,7 @@
     <link rel="match" href="reference/shape-outside-linear-gradient-001-ref.html"/>
     <meta name="flags" content="ahem"/>
     <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient under vertical-lr and text-orientation: sideways."/>
+    <meta name="fuzzy" content="maxDifference=0-1; totalPixels=7600-8700" />
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style type="text/css">
     .container {
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-horizontal-rtl.html b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-horizontal-rtl.html
new file mode 100644
index 00000000000..35e224eceff
--- /dev/null
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/shape-image/gradients/shape-outside-linear-gradient-horizontal-rtl.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Test: Test shape-outside with linear gradient when rtl direction is applied.</title>
+    <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-horizontal-rtl-ref.html">
+    <meta name="assert" content="This test verifies that shape-outside respects a simple linear gradient when rtl direction is applied.">
+    <link rel="stylesheet" href="/fonts/ahem.css">
+    <style>
+    .container {
+      inline-size: 100px;
+      block-size: 200px;
+      background-color: red;
+      font-family: Ahem;
+      font-size: 50px;
+      line-height: 1;
+      direction: rtl;
+      color: green;
+    }
+    #float-left {
+      float: left;
+      inline-size: 100px;
+      block-size: 200px;
+      background: linear-gradient(to right, green 50%, transparent 50%);
+      shape-outside: linear-gradient(to right, green 50%, transparent 50%);
+    }
+    #float-right {
+      float: right;
+      inline-size: 100px;
+      block-size: 200px;
+      background: linear-gradient(to left, green 50%, transparent 50%);
+      shape-outside: linear-gradient(to left, green 50%, transparent 50%);
+    }
+    </style>
+  </head>
+  <body>
+    <p>
+      The test passes if you see a green square. There should be no red.
+    </p>
+    <div class="container">
+      <div id="float-left"></div>
+      x x x x
+    </div>
+    <div class="container">
+      <div id="float-right"></div>
+      x x x x
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-052.html b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-052.html
index d8c462a563d..d9242d7a118 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-052.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-052.html
@@ -9,6 +9,7 @@
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
   <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#supported-basic-shapes">
   <link rel="match" href="reference/shape-outside-circle-052-ref.html">
+  <meta name="fuzzy" content="maxDifference=0-2; totalPixels=3" />
   <meta name="assert" content="Test the boxes are wrapping around the left float shape defined by circle(50% at right 40px bottom 40px) value under sideways-lr writing-mode.">
   <style>
   .container {
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-053.html b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-053.html
index 4ee2f880fa0..77849f2f6ee 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-053.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/circle/shape-outside-circle-053.html
@@ -9,6 +9,7 @@
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
   <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#supported-basic-shapes">
   <link rel="match" href="reference/shape-outside-circle-053-ref.html">
+  <meta name="fuzzy" content="maxDifference=0-2; totalPixels=1-3" />
   <meta name="assert" content="Test the boxes are wrapping around the right float shape defined by circle(50% at right 40px top 40px) value under sideways-lr writing-mode.">
   <style>
   .container {
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-050.html b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-050.html
index 18890072a7f..d31a7f677ea 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-050.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-050.html
@@ -9,6 +9,7 @@
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
   <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#supported-basic-shapes">
   <link rel="match" href="reference/shape-outside-ellipse-050-ref.html">
+  <meta name="fuzzy" content="maxDifference=0-2; totalPixels=2" />
   <meta name="assert" content="Test the boxes are wrapping around the left float shape defined by the basic shape ellipse(closest-side farthest-side at left 40px top 60px) border-box">
   <style>
   .container {
diff --git a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-051.html b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-051.html
index 764406a0bbc..d379b935aa3 100644
--- a/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-051.html
+++ b/tests/wpt/tests/css/css-shapes/shape-outside/supported-shapes/ellipse/shape-outside-ellipse-051.html
@@ -9,6 +9,7 @@
   <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
   <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#supported-basic-shapes">
   <link rel="match" href="reference/shape-outside-ellipse-051-ref.html">
+  <meta name="fuzzy" content="maxDifference=0-2; totalPixels=1-2" />
   <meta name="assert" content="Test the boxes are wrapping around the right float shape defined by the basic shape ellipse(closest-side farthest-side at left 40px top 60px) border-box">
   <style>
   .container {
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-color-001-ref.xht b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-color-001-ref.xht
index b38d04110e3..fc6160f3f13 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-color-001-ref.xht
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-color-001-ref.xht
@@ -12,7 +12,7 @@
 			.parent
 			{
 				border: solid 1px gray;
-				font: 1.5em monospace;
+				font: 1.5em/2 monospace;
 				width: 10em;
 			}
 			.ref1 rt
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-002-ref.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-002-ref.html
index 3a137ab708d..627ae004b86 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-002-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-002-ref.html
@@ -7,6 +7,6 @@
 </head>
 <body>
 <p>Test passes if "filled dot" is above every single character of "Text sample".</p>
-<div><ruby>T<rt>&#x2022;</rt>e<rt>&#x2022;</rt>x<rt>&#x2022;</rt>t<rt>&#x2022;</rt></ruby>  <ruby>s<rt>&#x2022;</rt>a<rt>&#x2022;</rt>m<rt>&#x2022;</rt>p<rt>&#x2022;</rt>l<rt>&#x2022;</rt>e<rt>&#x2022;</rt></span></div>
+<div style="font: 1.5em/2 monospace"><ruby>T<rt>&#x2022;</rt>e<rt>&#x2022;</rt>x<rt>&#x2022;</rt>t<rt>&#x2022;</rt></ruby>  <ruby>s<rt>&#x2022;</rt>a<rt>&#x2022;</rt>m<rt>&#x2022;</rt>p<rt>&#x2022;</rt>l<rt>&#x2022;</rt>e<rt>&#x2022;</rt></span></div>
 </body>
 </html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-007.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-007.html
index 1ae8e183242..1ce419d751f 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-007.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-007.html
@@ -7,7 +7,7 @@
     <!-- link rel="reviewer" title="" href="" -->
     <style>
         div {
-            font: 1.5em monospace;
+            font: 1.5em/2 monospace;
         }
     </style>
   </head>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-008-ref.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-008-ref.html
index d3891e01ac4..8f6c693abeb 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-008-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-008-ref.html
@@ -9,7 +9,7 @@
 	</head>
 	<body>
         <p>Test passes if "&#x25c9" is above every single character of "Text sample"</p>
-		<div style="font: 1.5em monospace">
+		<div style="font: 1.5em/2 monospace">
 			<span><ruby><rb>T</rb><rt>&#x25c9</rt><rb>e</rb><rt>&#x25c9</rt><rb>x</rb><rt>&#x25c9</rt><rb>t</rb><rt>&#x25c9</rt>
 			<rb>s</rb><rt>&#x25c9</rt><rb>a</rb><rt>&#x25c9</rt><rb>m</rb><rt>&#x25c9</rt><rb>p</rb><rt>&#x25c9</rt><rb>l</rb><rt>&#x25c9</rt><rb>e</rb><rt>&#x25c9</rt></ruby></span>.
 		</div>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-010-ref.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-010-ref.html
index 3eef63f5a87..d4ca0620d17 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-010-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-010-ref.html
@@ -7,7 +7,7 @@
                 <!-- link rel="reviewer" title="" href="" -->
         <style>
             div {
-                font: 1.5em monospace;
+                font: 1.5em/2 monospace;
             }
         </style>
         </head>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-012-ref.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-012-ref.html
index 868fa39906f..49d07e18ab4 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-012-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-012-ref.html
@@ -6,7 +6,7 @@
 <link rel="author" title="Yuuki Furukawa" href="mailto:tenderhearted0407@gmail.com">
 <style>
 div {
-    font: 1.5em monospace;
+    font: 1.5em/2 monospace;
 }
 </style>
 </head>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-021-ref.html b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-021-ref.html
index d09acdf64b9..1b50e7be2cb 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-021-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-021-ref.html
@@ -7,7 +7,7 @@
                 <!-- link rel="reviewer" title="" href="" -->
                 <style>
                     div {
-                        font: 1.5em monospace;
+                        font: 1.5em/2 monospace;
                     }
                 </style>
         </head>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-filled-001-ref.xht b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-filled-001-ref.xht
index 39be9c25697..1fe1e743d48 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-filled-001-ref.xht
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-filled-001-ref.xht
@@ -9,7 +9,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 		]]></style>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-open-001-ref.xht b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-open-001-ref.xht
index de908e0cd85..4ea6345ab0e 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-open-001-ref.xht
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-open-001-ref.xht
@@ -9,7 +9,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 		]]></style>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-shape-001-ref.xht b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-shape-001-ref.xht
index 41e53b93df2..b53c6aaa90e 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-shape-001-ref.xht
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-shape-001-ref.xht
@@ -9,7 +9,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 		]]></style>
diff --git a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-string-001-ref.xht b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-string-001-ref.xht
index e24c86abeb1..57392a0193f 100644
--- a/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-string-001-ref.xht
+++ b/tests/wpt/tests/css/css-text-decor/reference/text-emphasis-style-string-001-ref.xht
@@ -8,7 +8,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 		]]></style>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-color-001.xht b/tests/wpt/tests/css/css-text-decor/text-emphasis-color-001.xht
index 344200f2bbe..4513a225896 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-color-001.xht
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-color-001.xht
@@ -20,7 +20,7 @@
 			.parent
 			{
 				border: solid 1px gray;
-				font: 1.5em monospace;
+				font: 1.5em/2 monospace;
 				width: 10em;
 			}
 			.ref1 rt
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001-ref.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001-ref.html
index 6f02e05bdd9..31fa47f31c3 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001-ref.html
@@ -5,6 +5,10 @@
 <title>CSS Reference: text-emphasis line height, top</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<style> rt { font-variant-east-asian: inherit; } </style>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+rt { font-variant-east-asian: inherit; }
+</style>
 <p>Pass if the emphasis marks are below the black line:</p>
 <div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001a.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001a.html
index ea9589516dc..cfcd45cb019 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001a.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001a.html
@@ -8,5 +8,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-emphasis-position-property">
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-001-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+</style>
 <p>Pass if the emphasis marks are below the black line:</p>
 <div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001b.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001b.html
index d6468cb6c9c..e586b73429a 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001b.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001b.html
@@ -8,5 +8,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-emphasis-position-property">
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-001-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+</style>
 <p>Pass if the emphasis marks are below the black line:</p>
 <div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001z.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001z.html
index dded6094e35..21530cc8f2b 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001z.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-001z.html
@@ -6,9 +6,11 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-emphasis-position-property">
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-001-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
 <style>
 textarea {
   all: inherit;
+  font: 25px Ahem;
   width: 100%;
   height: 10em; /* ensure there's plenty of height even if the default font is quite tall,
                    to avoid risk of a vertical scrollbar showing up inside textarea */
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002-ref.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002-ref.html
index abff3e9e553..101f74a85f1 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002-ref.html
@@ -5,6 +5,10 @@
 <title>CSS Reference: text-emphasis line height, bottom</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
-<style> rt { font-variant-east-asian: inherit; } </style>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+rt { font-variant-east-asian: inherit; }
+</style>
 <p>Pass if the emphasis marks are over the black line:</p>
 <div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002a.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002a.html
index f4a47467a15..43b190723c6 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002a.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002a.html
@@ -8,5 +8,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-emphasis-position-property">
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-002-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+</style>
 <p>Pass if the emphasis marks are over the black line:</p>
 <div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002b.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002b.html
index 28a14cf4792..57c7c99b9b1 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002b.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-line-height-002b.html
@@ -8,5 +8,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-emphasis-position-property">
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-002-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 25px Ahem; }
+</style>
 <p>Pass if the emphasis marks are over the black line:</p>
 <div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1-ref.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1-ref.html
index 9cfcb247afe..89ff477e82d 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1-ref.html
@@ -4,7 +4,7 @@
 
 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
 <style>
-.ahem { font-family: Ahem; }
+.ahem { font: 25px/2 Ahem; }
 span { text-emphasis: filled circle; }
 </style>
 
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1.html
index e34e66007f7..8e93220ea76 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-1.html
@@ -7,7 +7,7 @@
 
 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
 <style>
-.emph { text-emphasis: filled circle; font-family: Ahem; }
+.emph { text-emphasis: filled circle; font: 25px/2 Ahem; }
 </style>
 
 <p>The punctuation should <b>not</b> have emphasis marks:</p>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2-ref.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2-ref.html
index 6d824e73d56..60c3bff0f95 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2-ref.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2-ref.html
@@ -4,6 +4,7 @@
 
 <style>
 :root { text-autospace: no-autospace; }
+p:lang(zh) { font: 16px/2 sans-serif; }
 span { text-emphasis: filled circle; }
 </style>
 
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2.html
index 53d261e9c8c..890cedca4bb 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-punctuation-2.html
@@ -7,6 +7,7 @@
 
 <style>
 :root { text-autospace: no-autospace; }
+p:lang(zh) { font: 16px/2 sans-serif; }
 .emph { text-emphasis: filled circle; }
 </style>
 
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-002.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-002.html
index 8189df23839..bae119deb5b 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-002.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-002.html
@@ -8,6 +8,9 @@
 <link rel="match" href="reference/text-emphasis-style-002-ref.html">
 <meta name="assert" content="This test checks 'text-emphasis-style: filled dot;'">
 <style>
+div {
+    font: 1.5em/2 monospace;
+}
 span{
 	text-emphasis-style: filled dot;
 }
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-007.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-007.html
index d78a7e20b81..1cd1123ee49 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-007.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-007.html
@@ -9,7 +9,7 @@
     <meta name="assert" content="Test checks 'text-emphasis-style: filled circle'">
     <style>
         div {
-            font: 1.5em monospace;
+            font: 1.5em/2 monospace;
         }
         span {
             text-emphasis-style: filled circle;
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-008.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-008.html
index 3eda8d7d6e6..fd298ac8aa9 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-008.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-008.html
@@ -15,7 +15,7 @@
 	</head>
 	<body>
         <p>Test passes if "&#x25c9" is above every single character of "Text sample"</p>
-		<div style="font: 1.5em monospace">
+		<div style="font: 1.5em/2 monospace">
 			<span>Text sample</span>.
 		</div>
 	</body>
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-010.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-010.html
index 3b83a16c309..52f94858067 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-010.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-010.html
@@ -9,7 +9,7 @@
         <link rel="match" href="reference/text-emphasis-style-010-ref.html">
         <style>
             div {
-                font: 1.5em monospace;
+                font: 1.5em/2 monospace;
             }
             span {
                 text-emphasis-style: filled sesame;
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-012.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-012.html
index da7febb0dac..bcd5eb98627 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-012.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-012.html
@@ -9,7 +9,7 @@
 <meta name="assert" content="This test checks 'text-emphasis-style: open dot;'">
 <style>
 div {
-    font: 1.5em monospace;
+    font: 1.5em/2 monospace;
 }
 span {
 	text-emphasis-style: open dot;
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-016.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-016.html
index 630e6ddf9a5..735c3948722 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-016.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-016.html
@@ -8,6 +8,9 @@
                 <meta name="assert" content="Test checks that 'text-emphasis-style: dot' renders as 'filled dot'.">
                 <link rel="match" href="reference/text-emphasis-style-002-ref.html">
                 <style>
+                        div {
+                                font: 1.5em/2 monospace;
+                        }
                         .test {
                                 text-emphasis-style: dot;
                         }
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-021.html b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-021.html
index 285d26075dc..8c1e2b54d34 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-021.html
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-021.html
@@ -9,7 +9,7 @@
                 <meta name="assert" content="This test checks 'text-emphasis-style:string'.">
                 <style>
                     div {
-                        font: 1.5em monospace;
+                        font: 1.5em/2 monospace;
                     }
                     span {
                         text-emphasis-style: '^';
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-filled-001.xht b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-filled-001.xht
index 63cf4f4c80a..6e786ae276c 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-filled-001.xht
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-filled-001.xht
@@ -12,7 +12,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 				#test1
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-open-001.xht b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-open-001.xht
index fb1655845b4..78019bea93f 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-open-001.xht
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-open-001.xht
@@ -12,7 +12,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 				#test1
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-shape-001.xht b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-shape-001.xht
index ef6220db296..c2ab583b6dc 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-shape-001.xht
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-shape-001.xht
@@ -12,7 +12,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 				#test1
diff --git a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-string-001.xht b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-string-001.xht
index 8cb320d627b..70ea1a56f78 100644
--- a/tests/wpt/tests/css/css-text-decor/text-emphasis-style-string-001.xht
+++ b/tests/wpt/tests/css/css-text-decor/text-emphasis-style-string-001.xht
@@ -12,7 +12,7 @@
 				.parent
 				{
 					border: solid 1px gray;
-					font: 1.5em monospace;
+					font: 1.5em/2 monospace;
 					width: 10em;
 				}
 				#test
diff --git a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-002.html b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-002.html
index 27a0fd2b631..30e37908a22 100644
--- a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-002.html
+++ b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-002.html
@@ -1,6 +1,5 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<meta name="fuzzy" content="1;0-100">
 <title>CSS Text level 3 Test: preserved trailing white space that hang in a textarea</title>
 <link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
 <link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
diff --git a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-004.html b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-004.html
index 756f07133a7..3d7aad05418 100644
--- a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-004.html
+++ b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-004.html
@@ -1,6 +1,5 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<meta name="fuzzy" content="1;0-100">
 <title>CSS Text level 3 Test: preserved trailing white space that hang in a textarea</title>
 <link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
 <link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
diff --git a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-002.html b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-002.html
index bb3649f3f31..0422506b516 100644
--- a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-002.html
+++ b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-002.html
@@ -1,6 +1,5 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<meta name="fuzzy" content="1;0-100">
 <title>CSS Text level 3 Test: preserved trailing RTL white space that hang in a textarea</title>
 <link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
 <link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
diff --git a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-004.html b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-004.html
index 0421942963d..7705d6dfb14 100644
--- a/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-004.html
+++ b/tests/wpt/tests/css/css-text/white-space/trailing-space-and-text-alignment-rtl-004.html
@@ -1,6 +1,5 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<meta name="fuzzy" content="1;0-100">
 <title>CSS Text level 3 Test: preserved trailing RTL white space that hang in a textarea</title>
 <link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
 <link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
diff --git a/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-computed.html b/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-computed.html
index ae1cade666c..b52d9987153 100644
--- a/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-computed.html
+++ b/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-computed.html
@@ -37,11 +37,21 @@ test_computed_value("rotate", "400grad y", "y 360deg");
 test_computed_value("rotate", "0 0.5 0 400grad", "y 360deg");
 test_computed_value("rotate", "0 1 0 400grad", "y 360deg");
 
+// ...though if the axis is in the reverse direction, the angle is negated.
+test_computed_value("rotate", "-0.5 0 0 400grad", "x -360deg");
+test_computed_value("rotate", "-1 0 0 400grad", "x -360deg");
+
+test_computed_value("rotate", "0 -0.5 0 400grad", "y -360deg");
+test_computed_value("rotate", "0 -1 0 400grad", "y -360deg");
+
 // If the axis is parallel with the z axis the property must serialize as just an <angle>.
 test_computed_value("rotate", "400grad", "360deg");
 test_computed_value("rotate", "400grad z", "360deg");
 test_computed_value("rotate", "0 0 0.5 400grad", "360deg");
 test_computed_value("rotate", "0 0 1 400grad", "360deg");
+
+test_computed_value("rotate", "0 0 -0.5 400grad", "-360deg");
+test_computed_value("rotate", "0 0 -1 400grad", "-360deg");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-valid.html b/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-valid.html
index 82544b094fc..0485ade2110 100644
--- a/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-valid.html
+++ b/tests/wpt/tests/css/css-transforms/parsing/rotate-parsing-valid.html
@@ -35,11 +35,21 @@ test_valid_value("rotate", "400grad y", "y 400grad");
 test_valid_value("rotate", "0 0.5 0 400grad", "y 400grad");
 test_valid_value("rotate", "0 1 0 400grad", "y 400grad");
 
+// ...though if the axis is in the reverse direction, the angle is negated.
+test_valid_value("rotate", "-0.5 0 0 400grad", "x -400grad");
+test_valid_value("rotate", "-1 0 0 400grad", "x -400grad");
+
+test_valid_value("rotate", "0 -0.5 0 400grad", "y -400grad");
+test_valid_value("rotate", "0 -1 0 400grad", "y -400grad");
+
 // If the axis is parallel with the z axis the property must serialize as just an <angle>.
 test_valid_value("rotate", "400grad");
 test_valid_value("rotate", "400grad z", "400grad");
 test_valid_value("rotate", "0 0 0.5 400grad", "400grad");
 test_valid_value("rotate", "0 0 1 400grad", "400grad");
+
+test_valid_value("rotate", "0 0 -0.5 400grad", "-400grad");
+test_valid_value("rotate", "0 0 -1 400grad", "-400grad");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/WEB_FEATURES.yml b/tests/wpt/tests/css/css-values/WEB_FEATURES.yml
index 34904682074..4fb94215e48 100644
--- a/tests/wpt/tests/css/css-values/WEB_FEATURES.yml
+++ b/tests/wpt/tests/css/css-values/WEB_FEATURES.yml
@@ -2,6 +2,9 @@ features:
 - name: abs-sign
   files:
   - signs-abs-*
+- name: attr
+  files:
+  - attr-*
 - name: cap
   files:
   - cap-*
diff --git a/tests/wpt/tests/css/css-values/attr-all-types.html b/tests/wpt/tests/css/css-values/attr-all-types.html
index 5ea11a68f8e..e2a20bab55b 100644
--- a/tests/wpt/tests/css/css-values/attr-all-types.html
+++ b/tests/wpt/tests/css/css-values/attr-all-types.html
@@ -106,6 +106,9 @@
     test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>))', 'anim', 'anim');
     test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>), anim-fallback)', '"anim"', 'anim-fallback');
     test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>), anim-fallback)', 'initial', 'anim-fallback');
+    test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>))', 'var(', '');
+    test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>))', 'var(--x fallback)', '');
+    test_valid_attr('animation-name', 'attr(data-foo type(<custom-ident>))', 'attr(data-bar type(number))', '');
 
     test_valid_attr('background-color', 'attr(data-foo type(<color>))', 'red', 'red');
     test_valid_attr('background-color', 'attr(data-foo type(<color>))', '#ff0099aa', '#ff0099aa');
@@ -121,6 +124,9 @@
     test_valid_attr('font-weight', 'attr(data-foo type(<number> |  lighter | bold), lighter)', '10px', 'lighter');
     test_valid_attr('font-weight', 'attr(data-foo type(<number>))', 'calc(3 + 3)', '6');
     test_valid_attr('font-weight', 'attr(data-foo type(<number>), calc(10 + 20))', '10px', '30');
+    test_valid_attr('font-weight', 'attr(data-foo type(<number>))', 'attr(', '');
+    test_valid_attr('font-weight', 'attr(data-foo type(<number>))', 'attr(data-bar type(number))', '');
+    test_valid_attr('font-weight', 'attr(data-foo type(<number>))', 'attr(data-bar type(<number>) 3)', '');
 
     test_valid_attr('font-size', 'attr(data-foo type(<percentage>))', '10%', '10%');
     test_valid_attr('font-size', 'attr(data-foo type(<percentage>), 10px)', 'abc', '10px');
diff --git a/tests/wpt/tests/css/css-view-transitions/document-active-view-transition.html b/tests/wpt/tests/css/css-view-transitions/document-active-view-transition.html
new file mode 100644
index 00000000000..7c04a2596fa
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/document-active-view-transition.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>View Transition: document.activeViewTransition attribute</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/#dom-document-activeviewtransition">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/utils.js"></script>
+
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  view-transition-name: target;
+}
+::view-transition-group(*) {
+  animation-duration: 1ms;
+}
+</style>
+
+<div id=target></div>
+
+<script>
+promise_test(async t => {
+  assert_implements(document.startViewTransition, "View Transitions are not supported");
+
+  assert_equals(document.activeViewTransition, null, "activeViewTransition is null initially");
+
+  const transition = document.startViewTransition(() => {});
+  assert_equals(document.activeViewTransition, transition, "activeViewTransition returns the running transition");
+
+  await transition.finished;
+
+  assert_equals(document.activeViewTransition, null, "activeViewTransition is null after transition finishes");
+
+
+  const transition2 = document.startViewTransition(() => {});
+  assert_equals(document.activeViewTransition, transition2, "activeViewTransition returns the running transition (2)");
+
+  transition2.skipTransition();
+
+  assert_equals(document.activeViewTransition, null, "activeViewTransition is null after transition is skipped");
+
+}, "document.activeViewTransition returns the active transition");
+</script>
diff --git a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-001.html b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-001.html
index f3026810dd5..b54ad1efbde 100644
--- a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-001.html
+++ b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-001.html
@@ -4,6 +4,7 @@
 
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#line-mappings">
 <meta assert="For the vertical-align property, the 'top' of the line box is its over edge; the 'bottom' of the line box is its under edge.">
+<meta name="fuzzy" content="maxDifference=0-64; totalPixels=0-1" />
 <link rel="match" href="reference/table-cell-valign-001-ref.html">
 <link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
 
diff --git a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-002.html b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-002.html
index d9440e4b299..344c3078515 100644
--- a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-002.html
+++ b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-002.html
@@ -4,6 +4,7 @@
 
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#line-mappings">
 <meta assert="For the vertical-align property, the 'top' of the line box is its over edge; the 'bottom' of the line box is its under edge.">
+<meta name="fuzzy" content="maxDifference=0-64; totalPixels=0-1" />
 <link rel="match" href="reference/table-cell-valign-001-ref.html">
 <link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
 
diff --git a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-003.html b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-003.html
index aaaea9bd0fe..9274588c7eb 100644
--- a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-003.html
+++ b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-003.html
@@ -4,6 +4,7 @@
 
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#line-mappings">
 <meta assert="For the vertical-align property, the 'top' of the line box is its over edge; the 'bottom' of the line box is its under edge.">
+<meta name="fuzzy" content="maxDifference=0-64; totalPixels=0-1" />
 <link rel="match" href="reference/table-cell-valign-003-ref.html">
 <link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
 
diff --git a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-004.html b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-004.html
index 9ccf09b6fb4..7a183c5279f 100644
--- a/tests/wpt/tests/css/css-writing-modes/table-cell-valign-004.html
+++ b/tests/wpt/tests/css/css-writing-modes/table-cell-valign-004.html
@@ -4,6 +4,7 @@
 
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#line-mappings">
 <meta assert="For the vertical-align property, the 'top' of the line box is its over edge; the 'bottom' of the line box is its under edge.">
+<meta name="fuzzy" content="maxDifference=0-64; totalPixels=0-1" />
 <link rel="match" href="reference/table-cell-valign-003-ref.html">
 <link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
 
diff --git a/tests/wpt/tests/css/css-writing-modes/text-combine-upright-sideways-001.html b/tests/wpt/tests/css/css-writing-modes/text-combine-upright-sideways-001.html
index 8fa22a7df8b..20417d9d515 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-combine-upright-sideways-001.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-combine-upright-sideways-001.html
@@ -4,6 +4,7 @@
 <link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#text-combine-upright"/>
 <link rel="match" href="reference/text-combine-upright-sideways-001-ref.html"/>
+<meta name="fuzzy" content="maxDifference=0-50; totalPixels=0-6">
 <style>
 .test {
   font: 32px sans-serif;
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029-ref.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029-ref.xht
new file mode 100644
index 00000000000..a3ff3ab7855
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029-ref.xht
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>CSS Reftest Reference</title>
+  <link rel="author" title="Hajime Shiozawa" href="mailto:hajime.shiozawa@gmail.com" />
+  <link rel="reviewer" title="G?rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2015-09-03 -->
+  <meta name="flags" content="image" />
+  <style type="text/css"><![CDATA[
+    img#orange
+    {
+      padding-left: 30px;
+    }
+    img#blue
+    {
+      padding-left: 60px;
+    }
+    div {
+      line-height: 0;
+    }
+  ]]></style>
+
+</head>
+
+<body>
+
+<p>Test passes if the left edge of an blue square is vertically aligned with the right edge of a orange square.</p>
+
+<div>
+  <img id="orange" src="support/swatch-orange.png" width="30" height="30" alt="Image download support must be enabled" /><!--
+--><br /><img id="blue" src="support/swatch-blue.png" width="60" height="60" alt="Image download support must be enabled" />
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029.xht
index f14078f6c62..d2e523404ba 100644
--- a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029.xht
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-029.xht
@@ -7,7 +7,7 @@
     <link rel="help" title="7.5 Line-Relative Mappings" href="http://www.w3.org/TR/css-writing-modes-4/#line-mappings" />
     <link rel="help" title="10.8.1 Leading and half-leading" href="http://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html#leading" />
     <meta name="assert" content="This test checks the position of inline non-replaced box with vertical align property. When 'writing-mode' is 'sideways-lr', 'vertical-align' is 'top', the physical left (logical top) edge of an inline non-replaced box is aligned with the physical left (logical top) edge of its line box." />
-    <link rel="match" href="vertical-alignment-008-ref.xht" />
+    <link rel="match" href="vertical-alignment-slr-029-ref.xht" />
     <meta name="flags" content="ahem" />
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style type="text/css"><![CDATA[
@@ -16,7 +16,6 @@
       writing-mode: sideways-lr;
       font: 60px/3 Ahem; /* computes to 60px/180px */
       color: blue;
-      margin-top: 46px; /* 30px (height of orange square) + 16px (p's margin-bottom) */
     }
 
     span#orange
@@ -24,7 +23,6 @@
       font-size: 0.5em;
       color: orange;
       vertical-align: top;
-      margin-bottom: -2em;
     }
 
     ]]></style>
@@ -33,7 +31,7 @@
 
   <body>
 
-  <p>Test passes if the left edge of an blue square is aligned with the right edge of a orange square.</p>
+  <p>Test passes if the left edge of an blue square is vertically aligned with the right edge of a orange square.</p>
 
   <div id="slr">A<span id="orange">O</span></div>
 
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031-ref.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031-ref.xht
new file mode 100644
index 00000000000..d46cde2af2d
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031-ref.xht
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>CSS Reftest Reference</title>
+  <link rel="author" title="Hajime Shiozawa" href="mailto:hajime.shiozawa@gmail.com" />
+  <link rel="reviewer" title="G?rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2015-09-03 -->
+  <meta name="flags" content="image" />
+  <style type="text/css"><![CDATA[
+    img
+    {
+      vertical-align: top;
+    }
+
+    img
+    {
+      padding-left: 90px; /* = the position of first orange square */
+    }
+
+    img + br + img
+    {
+      padding-left: 60px; /* = the position of second orange square*/
+    }
+  ]]></style>
+
+</head>
+
+<body>
+
+<p>Test passes if the <strong>right edge</strong> of an irregular orange polygon is straight and unbroken.</p>
+
+<div>
+   <img src="support/swatch-orange.png" width="30" height="30" alt="Image download support must be enabled" /><br/><!--
+--><img src="support/swatch-orange.png" width="60" height="60" alt="Image download support must be enabled" />
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031.xht
index e578a7177e7..360be5f4e1e 100644
--- a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031.xht
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-031.xht
@@ -7,7 +7,7 @@
     <link rel="help" title="7.5 Line-Relative Mappings" href="http://www.w3.org/TR/css-writing-modes-4/#line-mappings" />
     <link rel="help" title="10.8.1 Leading and half-leading" href="http://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html#leading" />
     <meta name="assert" content="This test checks the position of an inline non-replaced box with vertical align property. When 'writing-mode' is 'sideways-lr', 'vertical-align' is 'text-top', the physical left (logical top) edge of an inline non-replaced box is aligned with the left side (logical top) of parent's content area." />
-    <link rel="match" href="vertical-alignment-006-ref.xht" />
+    <link rel="match" href="vertical-alignment-slr-031-ref.xht" />
     <meta name="flags" content="ahem" />
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style type="text/css"><![CDATA[
@@ -16,12 +16,10 @@
       color: orange;
       font: 60px/3 Ahem; /* computes to 60px/180px */
       writing-mode: sideways-lr;
-      margin-top: 76px; /* 60px (height of A) + 16px (p's margin-bottom) */
     }
 
     span#orange30
     {
-      margin-bottom: -3em; /* computes to -90px */
       font-size: 0.5em; /* computes to 30px */
       vertical-align: text-top;
     }
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033-ref.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033-ref.xht
new file mode 100644
index 00000000000..cc75c7f5fba
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033-ref.xht
@@ -0,0 +1,33 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>CSS Reftest Reference</title>
+  <link rel="author" title="Hajime Shiozawa" href="mailto:hajime.shiozawa@gmail.com" />
+  <link rel="reviewer" title="G?rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2015-09-01 -->
+  <meta name="flags" content="image" />
+  <style type="text/css"><![CDATA[
+    img
+    {
+      vertical-align: top;
+    }
+
+    img
+    {
+      padding-left: 60px; /* =  position of orange squares */
+    }
+
+  ]]></style>
+
+</head>
+
+<body>
+
+<p>Test passes if the <strong>left edge</strong> of an irregular orange polygon is straight and unbroken.</p>
+
+<div>
+   <img src="support/swatch-orange.png" width="30" height="30" alt="Image download support must be enabled" /><br/><!--
+--><img src="support/swatch-orange.png" width="60" height="60" alt="Image download support must be enabled" />
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033.xht
index a832bb960e0..94c5db95a84 100644
--- a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033.xht
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-033.xht
@@ -7,7 +7,7 @@
     <link rel="help" title="7.5 Line-Relative Mappings" href="http://www.w3.org/TR/css-writing-modes-4/#line-mappings" />
     <link rel="help" title="10.8.1 Leading and half-leading" href="http://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html#leading" />
     <meta name="assert" content="This test checks the position of an inline non-replaced box with vertical align property. When 'writing-mode' is 'sideways-lr', 'vertical-align' is 'text-bottom', the physical right (logical bottom) edge of an inline non-replaced box is aligned with the right side (logical bottom) of parent's content area." />
-    <link rel="match" href="vertical-alignment-004-ref.xht" />
+    <link rel="match" href="vertical-alignment-slr-033-ref.xht" />
     <meta name="flags" content="ahem" />
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style type="text/css"><![CDATA[
@@ -16,12 +16,10 @@
       color: orange;
       font: 60px/3 Ahem; /* computes to 60px/180px */
       writing-mode: sideways-lr;
-      margin-top: 76px; /* 60px (height of A) + 16px (p's margin-bottom) */
     }
 
     span#orange30
     {
-      margin-bottom: -3em; /* computes to -90px */
       font-size: 0.5em; /* computes to 30px */
       vertical-align: text-bottom;
     }
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035-ref.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035-ref.xht
new file mode 100644
index 00000000000..1458c6b2ce2
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035-ref.xht
@@ -0,0 +1,34 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>CSS Reftest Reference</title>
+  <link rel="author" title="Hajime Shiozawa" href="mailto:hajime.shiozawa@gmail.com" />
+  <link rel="reviewer" title="G?rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2015-09-03 -->
+  <meta name="flags" content="image" />
+  <style type="text/css"><![CDATA[
+    img#orange
+    {
+      padding-left: 120px;
+    }
+    img#blue
+    {
+      padding-left: 60px;
+    }
+    div {
+      line-height: 0;
+    }
+  ]]></style>
+
+</head>
+
+<body>
+
+<p>Test passes if the right edge of an blue square is vertically aligned with the left edge of a orange square.</p>
+
+<div>
+  <img id="orange" src="support/swatch-orange.png" width="30" height="30" alt="Image download support must be enabled" /><!--
+--><br /><img id="blue" src="support/swatch-blue.png" width="60" height="60" alt="Image download support must be enabled" />
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035.xht b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035.xht
index e6a7f2378a7..ea64c4aed9e 100644
--- a/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035.xht
+++ b/tests/wpt/tests/css/css-writing-modes/vertical-alignment-slr-035.xht
@@ -7,7 +7,7 @@
     <link rel="help" title="7.5 Line-Relative Mappings" href="http://www.w3.org/TR/css-writing-modes-4/#line-mappings" />
     <link rel="help" title="10.8.1 Leading and half-leading" href="http://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html#leading" />
     <meta name="assert" content="This test checks the position of inline non-replaced box with vertical align property. When 'writing-mode' is 'sideways-lr', 'vertical-align' is 'bottom', the physical right (logical bottom) edge of an inline non-replaced box is aligned with the physical right (logical bottom) edge of its line box." />
-    <link rel="match" href="vertical-alignment-002-ref.xht" />
+    <link rel="match" href="vertical-alignment-slr-035-ref.xht" />
     <meta name="flags" content="ahem" />
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style type="text/css"><![CDATA[
@@ -16,7 +16,6 @@
       writing-mode: sideways-lr;
       font: 60px/3 Ahem; /* computes to 60px/180px */
       color: blue;
-      margin-top: 46px; /* 30px (height of orange square) + 16px (p's margin-bottom) */
     }
 
     span#orange
@@ -24,7 +23,6 @@
       font-size: 0.5em;
       color: orange;
       vertical-align: bottom;
-      margin-bottom: -2em; /* computes to -60px */
     }
     ]]></style>
 
@@ -32,7 +30,7 @@
 
   <body>
 
-  <p>Test passes if the right edge of an blue square is aligned with the left edge of a orange square.</p>
+  <p>Test passes if the right edge of an blue square is vertically aligned with the left edge of a orange square.</p>
 
   <div id="slr">A<span id="orange">O</span></div>
 
diff --git a/tests/wpt/tests/css/filter-effects/backdrop-filter-inline-positioning.html b/tests/wpt/tests/css/filter-effects/backdrop-filter-inline-positioning.html
new file mode 100644
index 00000000000..e881e67dbcc
--- /dev/null
+++ b/tests/wpt/tests/css/filter-effects/backdrop-filter-inline-positioning.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>backdrop-filter positioning for inline elements</title>
+<link rel="author" href="chromium-bugs-noreply@google.com">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="reference/backdrop-filter-inline-positioning-ref.html">
+
+<style>
+body {
+  background: #ffa500; /* orange in hex */
+}
+div {
+  margin-bottom: 120px;
+}
+.inline-backdrop-filter {
+  backdrop-filter: invert(100%);
+  padding: 50px;
+  border: 1px solid blue;
+  display: inline;
+}
+</style>
+<body>
+  <div>
+    <p>Expected: Orange background with inline elements showing inverted blue areas where backdrop-filter is applied.</p>
+  </div>
+  <div>
+    <span class="inline-backdrop-filter">1</span>
+  </div>
+  <div>
+    <span class="inline-backdrop-filter">2</span>
+  </div>
+  <div>
+    AB<span class="inline-backdrop-filter">3</span>
+  </div>
+  <div class="inline-backdrop-filter">4</div>
+</body>
diff --git a/tests/wpt/tests/css/filter-effects/reference/backdrop-filter-inline-positioning-ref.html b/tests/wpt/tests/css/filter-effects/reference/backdrop-filter-inline-positioning-ref.html
new file mode 100644
index 00000000000..167d47eed8a
--- /dev/null
+++ b/tests/wpt/tests/css/filter-effects/reference/backdrop-filter-inline-positioning-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>backdrop-filter positioning for inline elements - Reference</title>
+
+<style>
+body {
+  background: #ffa500; /* orange in hex for cross-browser consistency */
+}
+div {
+  margin-bottom: 120px;
+}
+.inline-backdrop-filter {
+  padding: 50px;
+  border: 1px solid blue;
+  display: inline;
+  background: #005aff; /* invert(100%) applied to orange #ffa500*/
+}
+</style>
+<body>
+  <div>
+    <p>Expected: Orange background with inline elements showing inverted blue areas where backdrop-filter is applied.</p>
+  </div>
+  <div>
+    <span class="inline-backdrop-filter">1</span>
+  </div>
+  <div>
+    <span class="inline-backdrop-filter">2</span>
+  </div>
+  <div>
+    AB<span class="inline-backdrop-filter">3</span>
+  </div>
+  <div class="inline-backdrop-filter">4</div>
+</body>
diff --git a/tests/wpt/tests/css/filter-effects/svg-empty-element-with-filter-001.html b/tests/wpt/tests/css/filter-effects/svg-empty-element-with-filter-001.html
index 9c441b748b1..b1e70ad990e 100644
--- a/tests/wpt/tests/css/filter-effects/svg-empty-element-with-filter-001.html
+++ b/tests/wpt/tests/css/filter-effects/svg-empty-element-with-filter-001.html
@@ -1,15 +1,34 @@
 <!DOCTYPE html>
-<title>CSS Filter Effects: ref filters on a empty svg shape</title>
+<title>CSS Filter Effects: ref filters on empty SVG shapes</title>
 <link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
-<link rel="match" href="reference/green-100x100.html">
-<meta name="assert" content="This test ensures we properly render filters on svg shapes that are empty.">
+<link rel="help" href="https://www.w3.org/TR/SVG2/shapes.html">
+<link rel="help" href="https://www.w3.org/TR/SVG2/paths.html#PathDataBNF">
+<link rel="match" href="/common/blank.html">
+<meta name="assert" content="This test ensures filters are not rendered for SVG shapes that are empty (zero-sized or no segments).">
 
 <svg>
   <defs>
     <filter id="myfilter" filterUnits="userSpaceOnUse" x="0" y="0" width="100" height="100">
-      <feFlood flood-color="green" flood-opacity="1"/>
+      <feFlood flood-color="red" flood-opacity="1"/>
     </filter>
   </defs>
 
-  <rect fill="red" height="0px" width="0px" filter="url(#myfilter)"/>
+  <!-- All elements below are empty. If the elements do not disable rendering,
+    we'll see a red box. This would violate the SVG spec language such as rect's
+    "A computed value of zero for either dimension disables rendering of the
+    element."-->
+
+  <rect x="10" y="10" width="0" height="0" fill="red" filter="url(#myfilter)"/>
+
+  <circle cx="40" cy="40" r="0" fill="red" filter="url(#myfilter)"/>
+  <ellipse cx="50" cy="50" rx="0" ry="20" fill="red" filter="url(#myfilter)"/>
+
+  <!-- Paths with an empty d or d===none should disable rendering -->
+  <path d="" fill="red" filter="url(#myfilter)"/>
+  <path fill="red" filter="url(#myfilter)"/>
+
+  <polygon points="" fill="red" filter="url(#myfilter)"/>
+  <polyline points="" fill="none" stroke="red" filter="url(#myfilter)"/>
+
+  <image x="10" y="10" width="10" height="0" filter="url(#myfilter)" />
 </svg>
diff --git a/tests/wpt/tests/css/selectors/has-focus-display-change.html b/tests/wpt/tests/css/selectors/has-focus-display-change.html
new file mode 100644
index 00000000000..2084a270154
--- /dev/null
+++ b/tests/wpt/tests/css/selectors/has-focus-display-change.html
@@ -0,0 +1,44 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>:has(:focus) doesn't cause focusability to be lost</title>
+<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
+<link rel="help" href="https://bugzil.la/1983421">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.com">
+<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>
+<style>
+.submenu {
+  display: none;
+}
+#container:has(:focus) > .submenu {
+  display: block;
+}
+</style>
+<div id="container">
+  <button id="first">A</button>
+  <div class="submenu">
+    <button id="second">B</button>
+  </div>
+</div>
+<script>
+  promise_test(async t => {
+    let first = document.getElementById("first");
+    let second = document.getElementById("second");
+
+    assert_equals(second.getBoundingClientRect().height, 0, "#second has no box");
+
+    first.focus();
+    assert_equals(document.activeElement, first, "#first is focused");
+    assert_not_equals(second.getBoundingClientRect().height, 0, "#second is displayed");
+    const kTab = '\uE004';
+    await new test_driver.Actions()
+      .keyDown(kTab)
+      .keyUp(kTab)
+      .send();
+    assert_equals(document.activeElement, second, "Focus can move to #second");
+  });
+</script>
diff --git a/tests/wpt/tests/css/selectors/heading.html b/tests/wpt/tests/css/selectors/heading.html
index 70afef0c4a6..d0eefa30320 100644
--- a/tests/wpt/tests/css/selectors/heading.html
+++ b/tests/wpt/tests/css/selectors/heading.html
@@ -33,17 +33,8 @@ const tests = [
   {args: ['8'], match: []},
   {args: ['9'], match: []},
   {args: ['0'], match: []},
-  {args: ['-1'], match: []},
   {args: ['0', '1', '2'], match: [1, 2]},
   {args: ['6', '7'], match: [6]},
-  {args: ['n'], match: [1, 2, 3, 4, 5, 6]},
-  {args: ['2n'], match: [2, 4, 6]},
-  {args: ['2n+1'], match: [1, 3, 5]},
-  {args: ['2n+2'], match: [2, 4, 6]},
-  {args: ['-n+3'], match: [1, 2, 3]},
-  {args: ['2n', '3n'], match: [2, 3, 4, 6]},
-  {args: ['even'], match: [2, 4, 6]},
-  {args: ['odd'], match: [1, 3, 5]},
 ];
 for (const el of els) {
   const testName = el.outerHTML + (el.parentNode === document.body ? '' : ' in ' + el.parentNode.localName);
diff --git a/tests/wpt/tests/css/selectors/parsing/parse-heading.html b/tests/wpt/tests/css/selectors/parsing/parse-heading.html
new file mode 100644
index 00000000000..1429dfb8a30
--- /dev/null
+++ b/tests/wpt/tests/css/selectors/parsing/parse-heading.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Selectors: The heading pseudo-classes</title>
+<link rel="help" href="https://drafts.csswg.org/selectors-5/#headings">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+  test_valid_selector(':heading');
+  test_valid_selector(':heading(2)');
+  test_valid_selector(':heading(99999)');
+  test_valid_selector(':heading(0)');
+  test_valid_selector(':heading(0, 1, 2)');
+  test_valid_selector(':heading(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)');
+  test_valid_selector(':heading(-1)');
+  test_valid_selector('h1:heading');
+  test_valid_selector('h1:heading(1)');
+  test_valid_selector('h1:heading(2)');
+
+  test_invalid_selector(':heading()');
+  test_invalid_selector(':heading(1.0)');
+  test_invalid_selector(':heading(1.4)');
+  test_invalid_selector(':heading(n)');
+  test_invalid_selector(':heading(odd)');
+  test_invalid_selector(':heading(even)');
+  test_invalid_selector(':heading(2n)');
+  test_invalid_selector(':heading(2n+1)');
+  test_invalid_selector(':heading(2n+2)');
+  test_invalid_selector(':heading(-n+3)');
+  test_invalid_selector(':heading(2n, 3n)');
+  test_invalid_selector(':heading(2, 3n)');
+  test_invalid_selector(':heading(2 of .foo)');
+  test_invalid_selector(':heading(2n of .foo)');
+</script>
diff --git a/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html b/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
index bef2d55c906..2a73c1743b4 100644
--- a/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/allowed-refresh-initiators.https.html
@@ -42,7 +42,7 @@
     const expectedCookieAndAttributes = `${expectedCookieAndValue};${expectedCookieAttributes}`;
     addCookieAndSessionCleanup(t);
 
-    configureServer({ allowedRefreshInitiators: [get_host_info().NOTSAMESITE_HOST],
+    await configureServer({ allowedRefreshInitiators: [get_host_info().NOTSAMESITE_HOST],
                       cookieDetails: [ {attributes: expectedCookieAttributes} ],
                     });
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/credentials-matching.https.html b/tests/wpt/tests/device-bound-session-credentials/credentials-matching.https.html
index cdbfa670459..289395497f9 100644
--- a/tests/wpt/tests/device-bound-session-credentials/credentials-matching.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/credentials-matching.https.html
@@ -18,7 +18,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to set the session credentials and the associated Set-Cookie header.
-    configureServer({ cookieDetails: [{ attributes: expectedAttributes }] });
+    await configureServer({ cookieDetails: [{ attributes: expectedAttributes }] });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/debug-header.https.html b/tests/wpt/tests/device-bound-session-credentials/debug-header.https.html
index b3e09e7fe09..99d4416b0c8 100644
--- a/tests/wpt/tests/device-bound-session-credentials/debug-header.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/debug-header.https.html
@@ -20,7 +20,7 @@
     await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
 
     // Configure server to fail to refresh
-    configureServer({ refreshEndpointUnavailable: true });
+    await configureServer({ refreshEndpointUnavailable: true });
 
     // Expire the cookie. The server will attempt a refresh, but fail.
     expireCookie(expectedCookieAndAttributes);
@@ -47,7 +47,7 @@
     await waitForCookie(expectedCookieAndValue, /*expectCookie=*/true);
 
     // Configure server to fail to refresh
-    configureServer({ refreshEndpointUnavailable: true });
+    await configureServer({ refreshEndpointUnavailable: true });
 
     // Expire the cookie. The server will attempt a refresh, but fail.
     expireCookie(expectedCookieAndAttributes);
@@ -85,7 +85,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to configure cookies for next two created sessions.
-    configureServer({
+    await configureServer({
       cookieDetailsForNextRegisteredSessions: [[{ nameAndValue: expectedCookieAndValue1 }], [{ nameAndValue: expectedCookieAndValue2 }]]
     });
 
@@ -96,7 +96,7 @@
     await waitForCookie(expectedCookieAndValue2, /*expectCookie=*/true);
 
     // Configure server to fail to refresh
-    configureServer({ refreshEndpointUnavailable: true });
+    await configureServer({ refreshEndpointUnavailable: true });
 
     // Expire the cookie. The server will attempt a refresh, but fail.
     expireCookie(expectedCookieAndAttributes1);
diff --git a/tests/wpt/tests/device-bound-session-credentials/include-site.https.html b/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
index 3441acfc625..6f5d1217bc2 100644
--- a/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/include-site.https.html
@@ -13,7 +13,7 @@
     const expectedCookieAndAttributes = `${expectedCookieAndValue};Domain=${location.hostname};Path=/device-bound-session-credentials`;
     addCookieAndSessionCleanup(t);
 
-    configureServer({ includeSite });
+    await configureServer({ includeSite });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/login.py b/tests/wpt/tests/device-bound-session-credentials/login.py
index 1d811fbaaa1..8c77d31ed47 100644
--- a/tests/wpt/tests/device-bound-session-credentials/login.py
+++ b/tests/wpt/tests/device-bound-session-credentials/login.py
@@ -28,8 +28,18 @@ def main(request, response):
     for i in range(num_sessions):
         registrations.append(('Sec-Session-Registration', f'(RS256);challenge="login_challenge_value";path="{registration_url}"{authorization_header}'))
 
+    headers = []
+    if request.headers.get(b"origin") is not None:
+        # Some tests (e.g. subdomain-registration.https.html) login
+        # across origins. Allow cookies so that we can get the
+        # session_manager for the request.
+        headers = [
+            ("Access-Control-Allow-Origin", request.headers.get(b"origin")),
+            ("Access-Control-Allow-Credentials", "true"),
+        ]
+
     if use_single_header:
         combined_registrations = [("Sec-Session-Registration", ", ".join([registration[1] for registration in registrations]))]
-        return (200, combined_registrations, "")
+        return (200, headers + combined_registrations, "")
     else:
-        return (200, registrations, "")
+        return (200, headers + registrations, "")
diff --git a/tests/wpt/tests/device-bound-session-credentials/multiple-credentials.https.html b/tests/wpt/tests/device-bound-session-credentials/multiple-credentials.https.html
index 54fc182b727..e3493081a45 100644
--- a/tests/wpt/tests/device-bound-session-credentials/multiple-credentials.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/multiple-credentials.https.html
@@ -18,7 +18,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to set two cookies in the session instruction credentials.
-    configureServer({ cookieDetails: [
+    await configureServer({ cookieDetails: [
       { nameAndValue: expectedCookieAndValue2, attributes: expectedAttributes2 },
       { nameAndValue: expectedCookieAndValue1, attributes: expectedAttributes1 },
     ]});
diff --git a/tests/wpt/tests/device-bound-session-credentials/multiple-registrations.https.html b/tests/wpt/tests/device-bound-session-credentials/multiple-registrations.https.html
index fb0ce500aa4..ccc1c49b35a 100644
--- a/tests/wpt/tests/device-bound-session-credentials/multiple-registrations.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/multiple-registrations.https.html
@@ -16,7 +16,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to configure cookies for next two created sessions.
-    configureServer({
+    await configureServer({
       cookieDetailsForNextRegisteredSessions: [[{ nameAndValue: expectedCookieAndValue1 }], [{ nameAndValue: expectedCookieAndValue2 }]]
     });
 
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
index a53245c590b..886b67358fe 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-does-not-send-challenge.https.html
@@ -14,7 +14,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to avoid sending back a challenge during refresh.
-    configureServer({ refreshSendsChallenge: false });
+    await configureServer({ refreshSendsChallenge: false });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
index 74264888075..342269836b0 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-replaces-config.https.html
@@ -31,7 +31,7 @@
     assert_equals(alternateAuthResponse.status, 401);
 
     // Configure server to change the cookie in the session config on next refresh.
-    configureServer({ cookieDetails: [{ nameAndValue: expectedCookieAndValue2 }] });
+    await configureServer({ cookieDetails: [{ nameAndValue: expectedCookieAndValue2 }] });
 
     // Expire the first cookie and send a request, which triggers the refresh with the new session config.
     expireCookie(expectedCookieAndAttributes1);
@@ -76,7 +76,7 @@
     assert_equals(authResponse.status, 200);
 
     // Configure server to change the session identifier in the session config on next refresh.
-    configureServer({ responseSessionIdOverride: 12345 });
+    await configureServer({ responseSessionIdOverride: 12345 });
 
     // Expire the first cookie and send a request, which triggers the refresh with the new session config.
     expireCookie(expectedCookieAndAttributes);
diff --git a/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html b/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
index 1953af5c0d2..bb4cbd08d33 100644
--- a/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/refresh-with-continue-false.https.html
@@ -14,7 +14,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to end the session upon refresh.
-    configureServer({ shouldRefreshEndSession: true });
+    await configureServer({ shouldRefreshEndSession: true });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html b/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html
index ab8d033afac..525a45598be 100644
--- a/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/registration-sends-challenge.https.html
@@ -14,7 +14,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to send back a challenge during registration.
-    configureServer({ registrationSendsChallenge: true });
+    await configureServer({ registrationSendsChallenge: true });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/resolving-urls.https.html b/tests/wpt/tests/device-bound-session-credentials/resolving-urls.https.html
index bb10cf52ee1..e6f635b78d5 100644
--- a/tests/wpt/tests/device-bound-session-credentials/resolving-urls.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/resolving-urls.https.html
@@ -14,7 +14,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to use the absolute URL for refresh instead of a relative URL.
-    configureServer({ refreshUrl });
+    await configureServer({ refreshUrl });
 
     // Configure registration to use absolute URL instead of relative.
     // Prompt starting a session, and wait until registration completes.
diff --git a/tests/wpt/tests/device-bound-session-credentials/session-cookie-has-no-attributes.https.html b/tests/wpt/tests/device-bound-session-credentials/session-cookie-has-no-attributes.https.html
index 5bf07abcac1..5f9ec211e05 100644
--- a/tests/wpt/tests/device-bound-session-credentials/session-cookie-has-no-attributes.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/session-cookie-has-no-attributes.https.html
@@ -13,7 +13,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to set up a session with a cookie that has no attributes.
-    configureServer({ cookieDetails: [{ attributes: "" }] });
+    await configureServer({ cookieDetails: [{ attributes: "" }] });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-authorization.https.html b/tests/wpt/tests/device-bound-session-credentials/set-authorization.https.html
index 7e2d8a0819b..30277edaa30 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-authorization.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-authorization.https.html
@@ -13,7 +13,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server send back an authorization header for registration.
-    configureServer({ authorizationValue: "authcode" });
+    await configureServer({ authorizationValue: "authcode" });
 
     // Prompt starting a session, and wait until registration completes.
     // The server will confirm that the authorization is sent in registration.
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-early-challenge.https.html b/tests/wpt/tests/device-bound-session-credentials/set-early-challenge.https.html
index 22166c86ffe..f39618907ed 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-early-challenge.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-early-challenge.https.html
@@ -15,7 +15,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server for sending back a challenge early on refresh.
-    configureServer({ earlyChallengeForNextRegisteredSession: earlyChallengeString });
+    await configureServer({ earlyChallengeForNextRegisteredSession: earlyChallengeString });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
@@ -47,7 +47,7 @@
 
     // Configure server for sending back a challenge early. Also configure the session's cookie
     // for test clarity (not strictly needed).
-    configureServer({
+    await configureServer({
       earlyChallengeForNextRegisteredSession: earlyChallenge1,
       cookieDetailsForNextRegisteredSessions: [[{ nameAndValue: expectedCookieAndValue1 }]]
     });
@@ -59,7 +59,7 @@
 
     // Configure server for sending back a challenge early, and configure the second session's
     // cookie.
-    configureServer({
+    await configureServer({
       earlyChallengeForNextRegisteredSession: earlyChallenge2,
       cookieDetailsForNextRegisteredSessions: [[{ nameAndValue: expectedCookieAndValue2 }]]
     });
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html b/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
index f56778a9e57..f3e68506fb2 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-scope-origin.https.html
@@ -13,7 +13,7 @@
     const expectedCookieAndAttributes = `${expectedCookieAndValue};Domain=${location.hostname};Path=/device-bound-session-credentials`;
     addCookieAndSessionCleanup(t);
 
-    configureServer({ scopeOrigin });
+    await configureServer({ scopeOrigin });
 
     // Prompt starting a session, and wait until registration completes.
     const loginResponse = await fetch('login.py');
diff --git a/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html b/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
index 5a36831f6dd..b1d2452b53e 100644
--- a/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
+++ b/tests/wpt/tests/device-bound-session-credentials/set-scope-specification.https.html
@@ -14,7 +14,7 @@
     addCookieAndSessionCleanup(t);
 
     // Configure server to set scope specification.
-    configureServer({ scopeSpecificationItems: [{
+    await configureServer({ scopeSpecificationItems: [{
       "type": "include",
       "domain": location.hostname,
       "path": "/device-bound-session-credentials/excludeInScopeSpecification/excluded_verify_authenticated.py"
diff --git a/tests/wpt/tests/device-bound-session-credentials/setup_sharded_server_state.py b/tests/wpt/tests/device-bound-session-credentials/setup_sharded_server_state.py
index 57e935ea57e..875ae310bae 100644
--- a/tests/wpt/tests/device-bound-session-credentials/setup_sharded_server_state.py
+++ b/tests/wpt/tests/device-bound-session-credentials/setup_sharded_server_state.py
@@ -9,13 +9,19 @@ def main(request, response):
     if test_id is None:
         test_id = session_manager.initialize_test()
 
-    headers = [("Set-Cookie", f"test_id={test_id}")]
+    # subdomain-registration.https.html does registration on a
+    # subdomain. Without the Domain attribute, the test_id cookie won't
+    # be available on the subdomain.
+    cookie_attributes = f"Domain={request.url_parts.hostname}"
+
     # Cross-site tests (e.g. allowed-refresh-initiators.https.html) require a
     # SameSite=None cookie, which must also be Secure. But
     # not-secure-connection.html cannot have a Secure cookie, so we need to make
     # the attributes conditional on the test.
     cross_site = request_body.get("crossSite")
     if cross_site is not None and cross_site:
-        headers = [("Set-Cookie", f"test_id={test_id};SameSite=None;Secure")]
+        cookie_attributes += ";SameSite=None;Secure"
+
+    headers = [("Set-Cookie", f"test_id={test_id};{cookie_attributes}")]
 
     return (200, headers, "")
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
new file mode 100644
index 00000000000..4836ab9688c
--- /dev/null
+++ b/tests/wpt/tests/device-bound-session-credentials/subdomain-registration.https.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/device-bound-session-credentials/helper.js" type="module"></script>
+
+<script type="module">
+  import {
+    addCookieAndSessionCleanup,
+    configureServer,
+    documentHasCookie,
+    expireCookie,
+    setupShardedServerState,
+    waitForCookie
+  } from "/device-bound-session-credentials/helper.js";
+
+  async function runTest(t, subdomain, expectRegistration) {
+    await setupShardedServerState();
+    const expectedCookieAndValue = "auth_cookie=abcdef0123";
+    const expectedCookieAttributes = `Domain=${location.hostname};Path=/device-bound-session-credentials`;
+    const expectedCookieAndAttributes = `${expectedCookieAndValue};${expectedCookieAttributes}`;
+    addCookieAndSessionCleanup(t);
+
+    // Configure the server with the parent domain's origin + cookie
+    // details instead of the subdomain's.
+    await configureServer({
+      "scopeOrigin": location.origin,
+      "cookieDetails": [
+        {
+          "nameAndValue": expectedCookieAndValue,
+          "attributes": expectedCookieAttributes
+        }
+      ]
+    });
+
+    // .well-known/device-bound-sessions hardcodes www as allowed, but not www1.
+    const loginUrl = new URL("/device-bound-session-credentials/login.py", location);
+    loginUrl.hostname = `${subdomain}.${location.hostname}`;
+
+    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));
+    }
+  }
+
+  promise_test(async t => {
+    await runTest(t, /*subdomain=*/"www1", /*expectRegistration=*/false);
+  }, "Registration fails without a .well-known");
+
+  promise_test(async t => {
+    await runTest(t, /*subdomain=*/"www", /*expectRegistration=*/true);
+  }, "Registration succeeds with a .well-known");
+</script>
diff --git a/tests/wpt/tests/fedcm/fedcm-authz/fedcm-continue-on-disallowed.https.html b/tests/wpt/tests/fedcm/fedcm-authz/fedcm-continue-on-disallowed.https.html
index fcda3a3dd59..5c7bf387510 100644
--- a/tests/wpt/tests/fedcm/fedcm-authz/fedcm-continue-on-disallowed.https.html
+++ b/tests/wpt/tests/fedcm/fedcm-authz/fedcm-continue-on-disallowed.https.html
@@ -24,7 +24,7 @@ fedcm_test(async t => {
   options = request_options_with_mediation_required('manifest_with_continue_on.json');
   options.mediation = 'silent';
   await select_manifest(t, options);
-  const cred_promise = fedcm_get_and_select_first_account(t, options);
+  const cred_promise = navigator.credentials.get(options);
   return promise_rejects_dom(t, 'NetworkError', cred_promise);
 }, "continue_on with mediation:silent should fail");
 
diff --git a/tests/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gziped.sub.html b/tests/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gzipped.sub.html
similarity index 100%
rename from tests/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gziped.sub.html
rename to tests/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gzipped.sub.html
diff --git a/tests/wpt/tests/fetch/range/general.any.js b/tests/wpt/tests/fetch/range/general.any.js
index 64b225a60bd..273e5ec79d1 100644
--- a/tests/wpt/tests/fetch/range/general.any.js
+++ b/tests/wpt/tests/fetch/range/general.any.js
@@ -88,10 +88,7 @@ promise_test(async () => {
     });
 
     const response = await fetch(stashTakeURL);
-
-    assert_regexp_match(await response.json(),
-                        /.*\bidentity\b.*/,
-                        `Expect identity accept-encoding if range header is ${JSON.stringify(rangeHeader)}`);
+    assert_equals(await response.json(), 'identity', `Expect identity accept-encoding if range header is ${JSON.stringify(rangeHeader)}`);
   }
 }, `Fetch with range header will be sent with Accept-Encoding: identity`);
 
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html b/tests/wpt/tests/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html
deleted file mode 100644
index e8c12c784f5..00000000000
--- a/tests/wpt/tests/html/dom/elements/global-attributes/the-anchor-attribute-003.tentative.html
+++ /dev/null
@@ -1,71 +0,0 @@
-<!DOCTYPE html>
-<title>Tests that ::before, ::after and ::backdrop pseudo elements use originating element's implicit anchor</title>
-<link rel="help" href="https://github.com/whatwg/html/pull/9144">
-<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#implicit">
-<link rel="author" href="mailto:xiaochengh@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-
-<style>
-body {
-  margin: 0;
-}
-#anchor {
-  width: 100px;
-  height: 100px;
-  margin-left: 150px;
-  margin-top: 50px;
-  background: orange;
-}
-#target::before, #target::after {
-  position: absolute;
-  width: 100px;
-  height: 100px;
-  background: lime;
-}
-#target::before{
-  content: '';
-  right: anchor(left);
-  top: anchor(top);
-}
-#target::after{
-  content: '';
-  left: anchor(right);
-  top: anchor(top);
-}
-
-dialog::backdrop {
-  top: calc(anchor(top) - 10px);
-  right: calc(anchor(right) - 10px);
-  bottom: calc(anchor(bottom, 0px) - 10px);
-  left: calc(anchor(left, 0px) - 10px);
-  background: lime;
-}
-
-</style>
-<div id="anchor"></div>
-<div id="target" anchor="anchor"></div>
-<dialog id="dialog" anchor="anchor"></div>
-
-<script>
-test(() => {
-  let style = getComputedStyle(target, '::before');
-  assert_equals(style.left, '50px');
-  assert_equals(style.top, '50px');
-}, "::before uses originating element's implicit anchor");
-
-test(() => {
-  let style = getComputedStyle(target, '::after');
-  assert_equals(style.left, '250px');
-  assert_equals(style.top, '50px');
-}, "::after uses originating element's implicit anchor");
-
-test(() => {
-  dialog.showModal();
-  let style = getComputedStyle(dialog, '::backdrop');
-  assert_equals(style.left, '140px');
-  assert_equals(style.top, '40px');
-  assert_equals(style.width, '120px');
-  assert_equals(style.height, '120px');
-}, "::backdrop uses originating element's implicit anchor");
-</script>
diff --git a/tests/wpt/tests/html/editing/dnd/events/dragdrop-text-elements-input-event-manual.html b/tests/wpt/tests/html/editing/dnd/events/dragdrop-text-elements-input-event-manual.html
new file mode 100644
index 00000000000..4c65e663666
--- /dev/null
+++ b/tests/wpt/tests/html/editing/dnd/events/dragdrop-text-elements-input-event-manual.html
@@ -0,0 +1,277 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>HTML5 Drag and Drop: insertFromDrop Input Event Test</title>
+    <meta
+      content="text/html; charset=UTF-8"
+      http-equiv="Content-Type"
+    />
+    <link
+      rel="author"
+      title="Microsoft"
+      href="http://www.microsoft.com/"
+    />
+    <link
+      rel="help"
+      href="https://w3c.github.io/input-events/#overview"
+    />
+    <meta
+      name="assert"
+      content="Test insertFromDrop input events and dataTransfer objects"
+    />
+    <style>
+      .drag-source {
+        border: 2px solid blue;
+        width: 200px;
+        height: 60px;
+        margin: 10px;
+        padding: 10px;
+        cursor: move;
+      }
+      .drop-target {
+        border: 2px dashed red;
+        width: 200px;
+        height: 60px;
+        margin: 10px;
+        padding: 10px;
+      }
+      .test-container {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 20px;
+        margin: 20px 0;
+      }
+      .result {
+        margin: 5px 0;
+        padding: 5px;
+        border: 1px solid #ccc;
+        font-family: monospace;
+        font-size: 12px;
+      }
+      textarea,
+      input {
+        width: 180px;
+        height: 40px;
+      }
+    </style>
+    <script type="text/javascript">
+      function logResult(test, pass, details) {
+        const div = document.getElementById("results");
+        const resultDiv = document.createElement("div");
+        resultDiv.className = "result";
+        resultDiv.style.color = pass ? "green" : "red";
+        resultDiv.innerHTML = `<strong>${test}:</strong> ${
+          pass ? "PASS" : "FAIL"
+        } - ${details}`;
+        div.appendChild(resultDiv);
+      }
+      function setupDropTarget(element, testName, isContentEditable) {
+        element.addEventListener("input", function (e) {
+          if (e.inputType === "insertFromDrop") {
+            if (isContentEditable) {
+              // For contenteditable div: expect dataTransfer populated, data as null
+              const hasDataTransfer =
+                e.dataTransfer !== null && e.dataTransfer !== undefined;
+              const dataIsNull = e.data === null;
+
+              if (hasDataTransfer && dataIsNull) {
+                logResult(
+                  testName,
+                  true,
+                  `DataTransfer: ${
+                    e.dataTransfer.types
+                      ? Array.from(e.dataTransfer.types).join(", ")
+                      : "none"
+                  }, Data: null (correct)`
+                );
+              } else {
+                logResult(
+                  testName,
+                  false,
+                  `Expected dataTransfer populated and data null. Got dataTransfer: ${hasDataTransfer}, data: ${e.data}`
+                );
+              }
+            } else {
+              // For input/textarea: expect dataTransfer null, data as text
+              const dataTransferIsNull = e.dataTransfer === null;
+              const hasData = e.data !== null && e.data !== undefined;
+
+              if (dataTransferIsNull && hasData) {
+                logResult(
+                  testName,
+                  true,
+                  `Data: "${e.data}", DataTransfer: null (correct)`
+                );
+              } else {
+                logResult(
+                  testName,
+                  false,
+                  `Expected dataTransfer null and data populated. Got dataTransfer: ${e.dataTransfer}, data: ${e.data}`
+                );
+              }
+            }
+          }
+        });
+      }
+      window.onload = function () {
+        // Make all divs contenteditable
+        document
+          .querySelectorAll("div.drag-source, div.drop-target")
+          .forEach((el) => (el.contentEditable = true));
+
+        // Setup input event listeners
+        setupDropTarget(
+          document.getElementById("div-target1"),
+          "Div to ContentEditable Div",
+          true
+        );
+        setupDropTarget(
+          document.getElementById("textarea-target1"),
+          "Div to Textarea",
+          false
+        );
+        setupDropTarget(
+          document.getElementById("input-target1"),
+          "Div to Input",
+          false
+        );
+        setupDropTarget(
+          document.getElementById("div-target2"),
+          "Textarea to ContentEditable Div",
+          true
+        );
+        setupDropTarget(
+          document.getElementById("textarea-target2"),
+          "Textarea to Textarea",
+          false
+        );
+        setupDropTarget(
+          document.getElementById("input-target2"),
+          "Textarea to Input",
+          false
+        );
+        setupDropTarget(
+          document.getElementById("input-target3"),
+          "Input to Input",
+          false
+        );
+        setupDropTarget(
+          document.getElementById("textarea-target3"),
+          "Input to Textarea",
+          false
+        );
+      };
+    </script>
+  </head>
+  <body>
+    <h1>insertFromDrop Input Event Test</h1>
+    <p>
+      Test insertFromDrop input events and their dataTransfer objects
+      during drag and drop operations.
+    </p>
+
+    <div class="test-container">
+      <!-- Div to ContentEditable Div -->
+      <div>
+        <h4>Div to ContentEditable Div</h4>
+        <div id="div1" class="drag-source">Drag this div text</div>
+        <div id="div-target1" class="drop-target">
+          Drop here (contenteditable)
+        </div>
+      </div>
+
+      <!-- Div to Textarea -->
+      <div>
+        <h4>Div to Textarea</h4>
+        <div id="div2" class="drag-source">Drag this div text</div>
+        <textarea
+          id="textarea-target1"
+          class="drop-target"
+          placeholder="Drop here"
+        ></textarea>
+      </div>
+
+      <!-- Div to Input -->
+      <div>
+        <h4>Div to Input</h4>
+        <div id="div3" class="drag-source">Drag this div text</div>
+        <input
+          id="input-target1"
+          class="drop-target"
+          placeholder="Drop here"
+        />
+      </div>
+
+      <!-- Textarea to ContentEditable Div -->
+      <div>
+        <h4>Textarea to ContentEditable Div</h4>
+        <textarea id="textarea1" class="drag-source">
+Drag this textarea</textarea
+        >
+        <div id="div-target2" class="drop-target">
+          Drop here (contenteditable)
+        </div>
+      </div>
+
+      <!-- Textarea to Textarea -->
+      <div>
+        <h4>Textarea to Textarea</h4>
+        <textarea id="textarea2" class="drag-source">
+Drag this textarea</textarea
+        >
+        <textarea
+          id="textarea-target2"
+          class="drop-target"
+          placeholder="Drop here"
+        ></textarea>
+      </div>
+
+      <!-- Textarea to Input -->
+      <div>
+        <h4>Textarea to Input</h4>
+        <textarea id="textarea3" class="drag-source">
+Drag this textarea</textarea
+        >
+        <input
+          id="input-target2"
+          class="drop-target"
+          placeholder="Drop here"
+        />
+      </div>
+
+      <!-- Input to Input -->
+      <div>
+        <h4>Input to Input</h4>
+        <input
+          id="input1"
+          class="drag-source"
+          value="Drag this input"
+        />
+        <input
+          id="input-target3"
+          class="drop-target"
+          placeholder="Drop here"
+        />
+      </div>
+
+      <!-- Input to Textarea -->
+      <div>
+        <h4>Input to Textarea</h4>
+        <input
+          id="input2"
+          class="drag-source"
+          value="Drag this input"
+        />
+        <textarea
+          id="textarea-target3"
+          class="drop-target"
+          placeholder="Drop here"
+        ></textarea>
+      </div>
+    </div>
+    <h3>insertFromDrop Results:</h3>
+    <div id="results">
+      Perform drag and drop operations above to see PASS/FAIL results...
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/html/editing/editing-0/contenteditable/spellcheck-insertReplacementText-input-event-manual.html b/tests/wpt/tests/html/editing/editing-0/contenteditable/spellcheck-insertReplacementText-input-event-manual.html
new file mode 100644
index 00000000000..61736269634
--- /dev/null
+++ b/tests/wpt/tests/html/editing/editing-0/contenteditable/spellcheck-insertReplacementText-input-event-manual.html
@@ -0,0 +1,209 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      HTML5 Text Replacement: insertReplacementText Input Event Test
+    </title>
+    <meta
+      content="text/html; charset=UTF-8"
+      http-equiv="Content-Type"
+    />
+    <link
+      rel="author"
+      title="Microsoft"
+      href="http://www.microsoft.com/"
+    />
+    <link
+      rel="help"
+      href="https://w3c.github.io/input-events/#overview"
+    />
+    <meta
+      name="assert"
+      content="Test insertReplacementText input events and dataTransfer objects"
+    />
+    <style>
+      .test-element {
+        border: 2px solid blue;
+        width: 200px;
+        height: 60px;
+        margin: 10px;
+        padding: 10px;
+      }
+      .test-container {
+        display: flex;
+        flex-wrap: wrap;
+        gap: 20px;
+        margin: 20px 0;
+      }
+      .result {
+        margin: 5px 0;
+        padding: 5px;
+        border: 1px solid #ccc;
+        font-family: monospace;
+        font-size: 12px;
+      }
+      textarea,
+      input {
+        width: 180px;
+        height: 40px;
+      }
+      .instructions {
+        background-color: #f0f0f0;
+        padding: 10px;
+        margin: 10px 0;
+      }
+    </style>
+    <script type="text/javascript">
+      function logResult(test, pass, details) {
+        const div = document.getElementById("results");
+        const resultDiv = document.createElement("div");
+        resultDiv.className = "result";
+        resultDiv.style.color = pass ? "green" : "red";
+        resultDiv.innerHTML = `<strong>${test}:</strong> ${
+          pass ? "PASS" : "FAIL"
+        } - ${details}`;
+        div.appendChild(resultDiv);
+      }
+
+      function setupReplacementTarget(
+        element,
+        testName,
+        isContentEditable
+      ) {
+        element.addEventListener("input", function (e) {
+          if (e.inputType === "insertReplacementText") {
+            if (isContentEditable) {
+              // For contenteditable div: expect dataTransfer populated, data as null
+              const hasDataTransfer =
+                e.dataTransfer !== null && e.dataTransfer !== undefined;
+              const dataIsNull = e.data === null;
+
+              if (hasDataTransfer && dataIsNull) {
+                logResult(
+                  testName,
+                  true,
+                  `DataTransfer: ${
+                    e.dataTransfer.types
+                      ? Array.from(e.dataTransfer.types).join(", ")
+                      : "none"
+                  }, Data: null (correct)`
+                );
+              } else {
+                logResult(
+                  testName,
+                  false,
+                  `Expected dataTransfer populated and data null. Got dataTransfer: ${hasDataTransfer}, data: ${e.data}`
+                );
+              }
+            } else {
+              // For input/textarea: expect dataTransfer null, data as text
+              const dataTransferIsNull = e.dataTransfer === null;
+              const hasData = e.data !== null && e.data !== undefined;
+
+              if (dataTransferIsNull && hasData) {
+                logResult(
+                  testName,
+                  true,
+                  `Data: "${e.data}", DataTransfer: null (correct)`
+                );
+              } else {
+                logResult(
+                  testName,
+                  false,
+                  `Expected dataTransfer null and data populated. Got dataTransfer: ${e.dataTransfer}, data: ${e.data}`
+                );
+              }
+            }
+          }
+        });
+      }
+
+      window.onload = function () {
+        // Make all divs contenteditable
+        document
+          .querySelectorAll("div.test-element")
+          .forEach((el) => (el.contentEditable = true));
+
+        // Setup input event listeners
+        setupReplacementTarget(
+          document.getElementById("div-target1"),
+          "Spell Check - ContentEditable Div",
+          true
+        );
+        setupReplacementTarget(
+          document.getElementById("textarea-target1"),
+          "Spell Check - Textarea",
+          false
+        );
+        setupReplacementTarget(
+          document.getElementById("input-target1"),
+          "Spell Check - Input",
+          false
+        );
+      };
+    </script>
+  </head>
+  <body>
+    <h1>insertReplacementText Input Event Test</h1>
+    <p>
+      Test insertReplacementText input events and their dataTransfer
+      objects during text replacement operations.
+    </p>
+
+    <div class="instructions">
+      <h3>Test Instructions:</h3>
+      <ol>
+        <li>
+          <strong>Spell Check:</strong> Type a misspelled word,
+          right-click and select a correction
+        </li>
+      </ol>
+    </div>
+
+    <div class="test-container">
+      <!-- Spell Check Tests -->
+      <div>
+        <h4>Spell Check - ContentEditable Div</h4>
+        <div id="div-target1" class="test-element" spellcheck="true">
+          Type "teh" or "recieve" and right-click for corrections
+        </div>
+      </div>
+
+      <div>
+        <h4>Spell Check - Textarea</h4>
+        <textarea
+          id="textarea-target1"
+          class="test-element"
+          spellcheck="true"
+          placeholder="Type 'teh' or 'recieve' and right-click for corrections"
+        ></textarea>
+      </div>
+
+      <div>
+        <h4>Spell Check - Input</h4>
+        <input
+          id="input-target1"
+          class="test-element"
+          spellcheck="true"
+          placeholder="Type 'teh' or 'recieve' and right-click for corrections"
+        />
+      </div>
+    </div>
+
+    <div class="instructions">
+      <h4>How to test:</h4>
+      <ul>
+        <li>
+          <strong>Spell Check:</strong> Type misspelled words like "teh"
+          or "recieve", right-click and select correction
+        </li>
+      </ul>
+    </div>
+
+    <h3>insertReplacementText Results:</h3>
+    <div id="results">
+      Perform text replacement operations above to see PASS/FAIL
+      results...
+    </div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-overflow.html b/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-overflow.html
index 089b0d9300b..83813f90209 100644
--- a/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-overflow.html
+++ b/tests/wpt/tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/fieldset-overflow.html
@@ -1,6 +1,5 @@
 <!DOCTYPE HTML>
 <title>fieldset overflow</title>
-<meta name="fuzzy" content="1;0-50">
 <link rel=match href=fieldset-overflow-ref.html>
 <style>
 fieldset, legend {
diff --git a/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-1-crash.html b/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-1-crash.html
new file mode 100644
index 00000000000..498a4906398
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-1-crash.html
@@ -0,0 +1,11 @@
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1982701">
+<style>
+*::first-line {}
+</style>
+<script>
+window.addEventListener("DOMContentLoaded", () => {
+  a.showModal()
+})
+</script>
+<dialog id="a">
+<details>
diff --git a/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-2-crash.html b/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-2-crash.html
new file mode 100644
index 00000000000..d26844eb3f7
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/firefox-bug-1928736-2-crash.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1982701">
+<style>
+  .wrapper::first-line { background: cyan }
+</style>
+<div class="wrapper">
+  WrapperFirstLine<br>
+  WrapperSecondLine<br>
+  <dialog id="a" open>
+    <details>
+      <summary>This is the summary</summary>
+      These are the details
+    </details>
+  </dialog>
+</div>
diff --git a/tests/wpt/tests/html/semantics/permission-element/parent-image-mask.tentative.html b/tests/wpt/tests/html/semantics/permission-element/parent-image-mask.tentative.html
new file mode 100644
index 00000000000..77fb824f028
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/permission-element/parent-image-mask.tentative.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Permission Element: invalid if parent has mask-image</title>
+    <link
+      rel="help"
+      href="https://github.com/WICG/PEPC/blob/main/explainer.md#locking-the-pepc-style"
+    />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      async_test((t) => {
+        const parent = document.createElement("div");
+        const element = document.createElement("permission");
+        element.setAttribute("type", "camera");
+        parent.appendChild(element);
+
+        parent.style.maskImage = "url(mask.png)";
+
+        element.onvalidationstatuschange = t.step_func(() => {
+          // These two invalid reasons are expected when the permission element was just created.
+          if (
+            element.invalidReason == "unsuccessful_registration" ||
+            element.invalidReason == "intersection_changed"
+          ) {
+            return;
+          }
+          assert_equals(
+            element.invalidReason,
+            "style_invalid",
+            `Parent with mask-image should be invalid`,
+          );
+          t.done();
+        });
+
+        document.body.appendChild(parent);
+      }, "Permission element is invalid if it has a parent with mask-image.");
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/html/semantics/permission-element/parent-mask.tentative.html b/tests/wpt/tests/html/semantics/permission-element/parent-mask.tentative.html
new file mode 100644
index 00000000000..0dab66b724c
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/permission-element/parent-mask.tentative.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Permission Element: invalid if parent has mask</title>
+    <link
+      rel="help"
+      href="https://github.com/WICG/PEPC/blob/main/explainer.md#locking-the-pepc-style"
+    />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      async_test((t) => {
+        const parent = document.createElement("div");
+        const element = document.createElement("permission");
+        element.setAttribute("type", "camera");
+        parent.appendChild(element);
+
+        parent.style.mask = "linear-gradient(black, transparent)";
+
+        element.onvalidationstatuschange = t.step_func(() => {
+          // These two invalid reasons are expected when the permission element was just created.
+          if (
+            element.invalidReason == "unsuccessful_registration" ||
+            element.invalidReason == "intersection_changed"
+          ) {
+            return;
+          }
+          assert_equals(
+            element.invalidReason,
+            "style_invalid",
+            `Parent with mask should be invalid`,
+          );
+          t.done();
+        });
+
+        document.body.appendChild(parent);
+      }, "Permission element is invalid if it has a parent with a mask.");
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded-ref.html b/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded-ref.html
index 738dc95f8eb..7ac010c0481 100644
--- a/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded-ref.html
+++ b/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded-ref.html
@@ -3,7 +3,7 @@
 <meta charset=utf-8>
 <style>
   permission {
-    font-size: 16px;
+    font-size: 14px;
     height: fit-content;
   }
 </style>
diff --git a/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded.tentative.html b/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded.tentative.html
index 78bd4f2555a..ae8bf3dbf25 100644
--- a/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded.tentative.html
+++ b/tests/wpt/tests/html/semantics/permission-element/quirks-mode-no-height-is-still-bounded.tentative.html
@@ -5,7 +5,7 @@
 <link rel="help" href="https://github.com/WICG/PEPC/blob/main/explainer.md#locking-the-pepc-style">
 <style>
   permission {
-    font-size: 16px;
+    font-size: 14px;
     padding-top: 10px;
   }
 </style>
diff --git a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/json-module/invalid-content-type.any.js b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/json-module/invalid-content-type.any.js
index d0bb6aa9fb1..3c13906d36d 100644
--- a/tests/wpt/tests/html/semantics/scripting-1/the-script-element/json-module/invalid-content-type.any.js
+++ b/tests/wpt/tests/html/semantics/scripting-1/the-script-element/json-module/invalid-content-type.any.js
@@ -13,7 +13,116 @@ const content_types = [
   "text/html;+json",
   "text/html+json+xml",
   "text/json/json",
+
+  // Control Characters and Whitespace - Invalid Type
+  "applic\x00ation/vnd.api+json",     // NULL in type
+  "applic\x09ation/vnd.api+json",     // TAB in type
+  "applic\x0Aation/vnd.api+json",     // Line Feed in type
+  "applic\x0Dation/vnd.api+json",     // Carriage Return in type
+  "applic ation/vnd.api+json",        // SPACE in type
+  "applic\x7Fation/vnd.api+json",     // DEL in type
+  "\x01application/vnd.api+json",     // SOH at start of type
+  "application\x1F/vnd.api+json",     // Unit Separator at end of type
+
+  // Control Characters and Whitespace - Invalid Subtype
+  "application/vnd\x00.api+json",     // NULL in subtype
+  "application/vnd\x09.api+json",     // TAB in subtype
+  "application/vnd\x0A.api+json",     // Line Feed in subtype
+  "application/vnd\x0D.api+json",     // Carriage Return in subtype
+  "application/vnd .api+json",        // SPACE in subtype
+  "application/vnd\x7F.api+json",     // DEL in subtype
+  "application/\x01vnd.api+json",     // SOH at start of subtype
+  "application/vnd.api\x1F+json",     // Unit Separator before +json
+
+  // Separator Characters - Invalid Type
+  "applic\"ation/vnd.api+json",       // Double quote in type
+  "applic(ation/vnd.api+json",        // Left parenthesis in type
+  "applic)ation/vnd.api+json",        // Right parenthesis in type
+  "applic,ation/vnd.api+json",        // Comma in type
+  "applic:ation/vnd.api+json",        // Colon in type
+  "applic;ation/vnd.api+json",        // Semicolon in type
+  "applic<ation/vnd.api+json",        // Left angle bracket in type
+  "applic>ation/vnd.api+json",        // Right angle bracket in type
+  "applic=ation/vnd.api+json",        // Equals in type
+  "applic?ation/vnd.api+json",        // Question mark in type
+  "applic@ation/vnd.api+json",        // At sign in type
+  "applic[ation/vnd.api+json",        // Left square bracket in type
+  "applic]ation/vnd.api+json",        // Right square bracket in type
+  "applic{ation/vnd.api+json",        // Left curly brace in type
+  "applic}ation/vnd.api+json",        // Right curly brace in type
+
+  // Separator Characters - Invalid Subtype
+  "application/vnd\"api\"+json",      // Double quote in subtype
+  "application/vnd(api+json",         // Left parenthesis in subtype
+  "application/vnd)api+json",         // Right parenthesis in subtype
+  "application/vnd,api+json",         // Comma in subtype
+  "application/vnd:api+json",         // Colon in subtype
+  "application/vnd;api+json",         // Semicolon in subtype
+  "application/vnd<api+json",         // Left angle brackets in subtype
+  "application/vnd>api+json",         // Right angle brackets in subtype
+  "application/vnd=api+json",         // Equals in subtype
+  "application/vnd?api+json",         // Question mark in subtype
+  "application/vnd@api+json",         // At sign in subtype
+  "application/vnd[api+json",         // Left square brackets in subtype
+  "application/vnd]api+json",         // Right square brackets in subtype
+  "application/vnd{api+json",         // Left curly brace in subtype
+  "application/vnd}api+json",         // Right curly brace in subtype
+
+  // Non-ASCII Characters - Invalid Type
+  "aplicación/vnd.api+json",          // Latin small letter o with acute
+  "申请/vnd.api+json",                 // Chinese characters
+  "app™lication/vnd.api+json",        // Trade mark sign
+  "appli€cation/vnd.api+json",        // Euro sign
+  "🚀application/vnd.api+json",       // Rocket emoji
+  "applicatioñ/vnd.api+json",         // Latin small letter n with tilde
+
+  // Non-ASCII Characters - Invalid Subtype
+  "application/vñd.api+json",         // Latin small letter n with tilde
+  "application/vnd.apí+json",         // Latin small letter i with acute
+  "application/vnd.api™+json",        // Trade mark sign
+  "application/vnd.api€+json",        // Euro sign
+  "application/vnd.中文+json",         // Chinese characters
+  "application/vnd.api🚀+json",       // Rocket emoji
+  "application/café.api+json",        // Latin small letter e with acute
+
+  // Mixed Invalid Characters (Both Type and Subtype)
+  "applic ation/vnd api+json",        // Spaces in both
+  "applic\"ation/vnd\"api+json",      // Quotes in both
+  "applic(ation/vnd(api+json",        // Left parentheses in both
+  "applic)ation/vnd)api+json",        // Right parentheses in both
+  "applic,ation/vnd,api+json",        // Commas in both
+  "applic=ation/vnd=api+json",        // Equals in both
+  "申请/中文.api+json",                 // Chinese in both
+  "app™/vnd€.api+json",               // Unicode symbols in both
+  "applic\x00ation/vnd\x00api+json",  // NULL in both
+  "applic;ation/vnd;api+json",        // Semicolons in both
+  "applic{ation/vnd{api+json",        // Left curly brace in both
+  "applic}ation/vnd}api+json",        // Right curly brace in both
+  "applic[ation/vnd[api+json",        // Left square bracket in both
+  "applic]ation/vnd]api+json",        // Right square bracket in both
+  "applic<ation/vnd<api+json",        // Left angle bracket in both
+  "applic>ation/vnd>api+json",        // Right angle bracket in both
+
+  // Edge Cases - Type
+  "\"application/vnd.api+json",       // Quote at start of type
+  "application\"/vnd.api+json",       // Quote at end of type
+  "application /vnd.api+json",        // Trailing space in type
+  "/vnd.api+json",                    // Empty type
+  "app\x00lication/vnd.api+json",     // NULL in middle of type
+
+  // Edge Cases - Subtype
+  "application/\"vnd.api+json",       // Quote at start of subtype
+  "application/vnd.api\"+json",       // Quote before +json
+  "application/ vnd.api+json",        // Leading space in subtype
+  "application/vnd.api +json",        // Space before +json
+  "application/vnd.api+json\"",       // Quote at end
+
+  // Edge Cases - Multiple Invalid Positions
+  "\"application\"/\"vnd.api\"+json", // Quotes in multiple positions
+  "app(lic)ation/vnd(api)+json",      // Parentheses in multiple positions
+  "application\x00/\x00vnd.api+json",  // NULL in both parts
 ];
+
 for (const content_type of content_types) {
   promise_test(async test => {
     await promise_rejects_js(test, TypeError,
diff --git a/tests/wpt/tests/html/semantics/the-button-element/command-and-commandfor/event-dispatch-shadow.html b/tests/wpt/tests/html/semantics/the-button-element/command-and-commandfor/event-dispatch-shadow.html
index 7b15123412c..6578d940bda 100644
--- a/tests/wpt/tests/html/semantics/the-button-element/command-and-commandfor/event-dispatch-shadow.html
+++ b/tests/wpt/tests/html/semantics/the-button-element/command-and-commandfor/event-dispatch-shadow.html
@@ -5,7 +5,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/invoker-utils.js"></script>
-
+<body>
 <script>
   test(function (t) {
     const host = document.createElement("div");
@@ -35,3 +35,4 @@
     assert_equals(eventSource, host, "source is host");
   }, "cross shadow CommandEvent retargets source to host element");
 </script>
+</body>
\ No newline at end of file
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-event-handler.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-event-handler.sub.html
deleted file mode 100644
index 346660511ee..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-event-handler.sub.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, document.write(): script-src-event-handler</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<script src=/common/utils.js></script>
-<script src=/html/syntax/speculative-parsing/resources/speculative-parsing-util.js></script>
-<script>
-  setup({single_test: true});
-  const uuid = token();
-  expect_fetched_onload(uuid, false)
-    .then(compare_with_nonspeculative(uuid, 'script-src-event-handler', false))
-    .then(done);
-  document.write(`
-    <script src="/common/slow.py?delay=1500"><\/script>
-    <script>
-     document.write('<plaintext>');
-    <\/script>
-    <\!-- speculative case in document.write -->
-    <script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;" event="" for=""><\/script>
-  `);
-</script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-nomodule.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-nomodule.tentative.sub.html
similarity index 100%
rename from tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-nomodule.sub.html
rename to tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-nomodule.tentative.sub.html
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-language.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-language.sub.html
deleted file mode 100644
index e418c0e1edd..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-language.sub.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, document.write(): script-src-unsupported-language</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<script src=/common/utils.js></script>
-<script src=/html/syntax/speculative-parsing/resources/speculative-parsing-util.js></script>
-<script>
-  setup({single_test: true});
-  const uuid = token();
-  expect_fetched_onload(uuid, false)
-    .then(compare_with_nonspeculative(uuid, 'script-src-unsupported-language', false))
-    .then(done);
-  document.write(`
-    <script src="/common/slow.py?delay=1500"><\/script>
-    <script>
-     document.write('<plaintext>');
-    <\/script>
-    <\!-- speculative case in document.write -->
-    <script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;" language="vbscript"><\/script>
-  `);
-</script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.tentative.sub.html
similarity index 97%
rename from tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.sub.html
rename to tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.tentative.sub.html
index 665e7abb02d..1eaa56494db 100644
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.sub.html
+++ b/tests/wpt/tests/html/syntax/speculative-parsing/generated/document-write/script-src-unsupported-type.tentative.sub.html
@@ -20,6 +20,6 @@
      document.write('<plaintext>');
     <\/script>
     <\!-- speculative case in document.write -->
-    <script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;" type="text/plain"><\/script>
+    <script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid=${uuid}&amp;encodingcheck=&Gbreve;" type=text/plain><\/script>
   `);
 </script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-event-handler-framed.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-event-handler-framed.sub.html
deleted file mode 100644
index 7b9e0edeb97..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-event-handler-framed.sub.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, page load (helper file): script-src-event-handler</title>
-<script src="/common/slow.py?delay=1500"></script>
-<script>
-  document.write('<plaintext>');
-</script>
-<!-- speculative case -->
-<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" event="" for=""></script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-language-framed.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-language-framed.sub.html
deleted file mode 100644
index 62b2c4c017b..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-language-framed.sub.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, page load (helper file): script-src-unsupported-language</title>
-<script src="/common/slow.py?delay=1500"></script>
-<script>
-  document.write('<plaintext>');
-</script>
-<!-- speculative case -->
-<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" language="vbscript"></script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-type-framed.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-type-framed.sub.html
index 78e71941b35..1f38560ee15 100644
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-type-framed.sub.html
+++ b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/resources/script-src-unsupported-type-framed.sub.html
@@ -9,4 +9,4 @@
   document.write('<plaintext>');
 </script>
 <!-- speculative case -->
-<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" type="text/plain"></script>
+<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" type=text/plain></script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html
deleted file mode 100644
index 6bb89bd463c..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-event-handler.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, page load: script-src-event-handler</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<script src=/common/utils.js></script>
-<script src=/html/syntax/speculative-parsing/resources/speculative-parsing-util.js></script>
-<body>
-<script>
-  setup({single_test: true});
-  const uuid = token();
-  const iframe = document.createElement('iframe');
-  iframe.src = `resources/script-src-event-handler-framed.sub.html?uuid=${uuid}`;
-  document.body.appendChild(iframe);
-  expect_fetched_onload(uuid, false)
-    .then(compare_with_nonspeculative(uuid, 'script-src-event-handler', false))
-    .then(done);
-</script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.tentative.html
similarity index 100%
rename from tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.html
rename to tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-nomodule.tentative.html
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html
deleted file mode 100644
index 60f50eb34d6..00000000000
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-language.html
+++ /dev/null
@@ -1,21 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT. This file has been generated. Source:
-     /html/syntax/speculative-parsing/tools/generate.py
--->
-<meta charset=utf-8>
-<title>Speculative parsing, page load: script-src-unsupported-language</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<script src=/common/utils.js></script>
-<script src=/html/syntax/speculative-parsing/resources/speculative-parsing-util.js></script>
-<body>
-<script>
-  setup({single_test: true});
-  const uuid = token();
-  const iframe = document.createElement('iframe');
-  iframe.src = `resources/script-src-unsupported-language-framed.sub.html?uuid=${uuid}`;
-  document.body.appendChild(iframe);
-  expect_fetched_onload(uuid, false)
-    .then(compare_with_nonspeculative(uuid, 'script-src-unsupported-language', false))
-    .then(done);
-</script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.tentative.html
similarity index 100%
rename from tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.html
rename to tests/wpt/tests/html/syntax/speculative-parsing/generated/page-load/script-src-unsupported-type.tentative.html
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/generated/resources/script-src-unsupported-type-nonspeculative.sub.html b/tests/wpt/tests/html/syntax/speculative-parsing/generated/resources/script-src-unsupported-type-nonspeculative.sub.html
index dc8343c3824..94098b5c775 100644
--- a/tests/wpt/tests/html/syntax/speculative-parsing/generated/resources/script-src-unsupported-type-nonspeculative.sub.html
+++ b/tests/wpt/tests/html/syntax/speculative-parsing/generated/resources/script-src-unsupported-type-nonspeculative.sub.html
@@ -5,6 +5,6 @@
 <meta charset=utf-8>
 <title>Speculative parsing, non-speculative (helper file): script-src-unsupported-type</title>
 <!-- non-speculative case -->
-<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" type="text/plain"></script>
+<script src="/html/syntax/speculative-parsing/resources/stash.py?action=put&amp;uuid={{GET[uuid]}}&amp;encodingcheck=&Gbreve;" type=text/plain></script>
 <!-- block the load event for a bit: -->
 <script src="/common/slow.py?delay=1500"></script>
diff --git a/tests/wpt/tests/html/syntax/speculative-parsing/tools/generate.py b/tests/wpt/tests/html/syntax/speculative-parsing/tools/generate.py
index b3b577d9e10..f0db885814b 100755
--- a/tests/wpt/tests/html/syntax/speculative-parsing/tools/generate.py
+++ b/tests/wpt/tests/html/syntax/speculative-parsing/tools/generate.py
@@ -88,6 +88,14 @@ tentative_tests = [
       u'true',
       u'true'
     ),
+    (
+      u'script-src-unsupported-type',
+      u'utf-8',
+      u'<script src="{}" type=text/plain></script>',
+      None,
+      u'false',
+      u'true'
+    ),
     (
       u'script-src-type-application-ecmascript',
       u'utf-8',
@@ -96,6 +104,14 @@ tentative_tests = [
       u'true',
       u'true'
     ),
+    (
+      u'script-src-nomodule',
+      u'utf-8',
+      u'<script src="{}" nomodule></script>',
+      None,
+      u'false',
+      u'true'
+    ),
     (
       u'script-src-module',
       u'utf-8',
@@ -510,38 +526,6 @@ tests = [
     # template_testcase_markup,
     # expect_load,
     # test_nonspeculative
-    (
-      u'script-src-unsupported-type',
-      u'utf-8',
-      u'<script src="{}" type="text/plain"></script>',
-      None,
-      u'false',
-      u'true'
-    ),
-    (
-      u'script-src-unsupported-language',
-      u'utf-8',
-      u'<script src="{}" language="vbscript"></script>',
-      None,
-      u'false',
-      u'false'
-    ),
-    (
-      u'script-src-nomodule',
-      u'utf-8',
-      u'<script src="{}" nomodule></script>',
-      None,
-      u'false',
-      u'true'
-    ),
-    (
-      u'script-src-event-handler',
-      u'utf-8',
-      u'<script src="{}" event="" for=""></script>',
-      None,
-      u'false',
-      u'false'
-    ),
 ]
 
 # Templates
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/mutation-observer.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/mutation-observer.html
new file mode 100644
index 00000000000..2f8701385a5
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/mutation-observer.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>document.write in mutation observer</title>
+<link rel=help href="https://html.spec.whatwg.org/#parsing-main-incdata">
+<link rel=help href="https://html.spec.whatwg.org/#perform-a-microtask-checkpoint">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+[
+  {name: "classic", src: "resources/mutation-observer-iframe-script.html"},
+  {name: "module", src: "resources/mutation-observer-iframe-script-module.html"},
+  {name: "async", src: "resources/mutation-observer-iframe-script-async.html"},
+  {name: "defer", src: "resources/mutation-observer-iframe-script-defer.html"},
+].forEach(({name, src}) => {
+  promise_test(async t => {
+    const iframe = document.createElement("iframe");
+
+    iframe.onerror = t.unreached_func("Error loading iframe");
+    document.addEventListener("scriptRan", t.unreached_func("script should not run"));
+    document.addEventListener("documentWriteDone", t.step_func(() => {
+      assert_equals(iframe.contentDocument.body.textContent, "document.write body contents\n");
+    }));
+
+    let loadPromise = new Promise(resolve => {
+      iframe.onload = t.step_func(() => {
+        assert_equals(iframe.contentDocument.body.textContent, "document.write body contents\n");
+        resolve();
+      });
+    });
+
+    iframe.src = src;
+    document.body.appendChild(iframe);
+
+    await loadPromise;
+  }, `Mutation observer for ${name} script element`);
+});
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-async.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-async.html
new file mode 100644
index 00000000000..680290fab2f
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-async.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<script>
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
+        document.write("document.write body contents\n");
+        document.close();
+        window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
+      }
+    });
+  });
+}).observe(document.documentElement, { childList: true, subtree: true });
+</script>
+Initial body contents
+<script src="mutation-observer-iframe-script.js" async></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-defer.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-defer.html
new file mode 100644
index 00000000000..e5669ad0c39
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-defer.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<script>
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
+        document.write("document.write body contents\n");
+        document.close();
+        window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
+      }
+    });
+  });
+}).observe(document.documentElement, { childList: true, subtree: true });
+</script>
+Initial body contents
+<script src="mutation-observer-iframe-script.js" defer></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-module.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-module.html
new file mode 100644
index 00000000000..f15bef511ae
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script-module.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<script>
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
+        document.write("document.write body contents\n");
+        document.close();
+        window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
+      }
+    });
+  });
+}).observe(document.documentElement, { childList: true, subtree: true });
+</script>
+Initial body contents
+<script type="module">window.parent.document.dispatchEvent(new CustomEvent("scriptRan"));</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.html
new file mode 100644
index 00000000000..ebcdc19ec49
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<script>
+window.scriptRan = false;
+
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
+        document.write("document.write body contents\n");
+        document.close();
+        window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
+      }
+    });
+  });
+}).observe(document.documentElement, { childList: true, subtree: true });
+</script>
+Initial body contents
+<script>window.parent.document.dispatchEvent(new CustomEvent("scriptRan"));</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.js b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.js
new file mode 100644
index 00000000000..0267705294a
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/document-write/resources/mutation-observer-iframe-script.js
@@ -0,0 +1 @@
+window.parent.document.dispatchEvent(new CustomEvent("scriptRan"));
diff --git a/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-01.html b/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-01.html
new file mode 100644
index 00000000000..a84a662a53a
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-01.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<head>
+<link rel=help href="https://html.spec.whatwg.org/#parsing-main-incdata">
+<link rel=help href="https://html.spec.whatwg.org/#perform-a-microtask-checkpoint">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+
+let classicScriptRan = false;
+let moduleScriptRan = false;
+let asyncScriptRan = false;
+let deferSCriptRan = false;
+
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
+        node.setAttribute("type", "text/plain");
+      }
+    });
+  });
+}).observe(document.body, { childList: true, subtree: true });
+
+let test = async_test("Microtask before prepare-the-script-element steps");
+window.onload = test.step_func_done(function(e) {
+  assert_false(classicScriptRan, "Classic script should not run");
+  assert_false(moduleScriptRan, "Module script should not run");
+  assert_false(asyncScriptRan, "Async script should not run");
+  assert_false(deferSCriptRan, "Defer script should not run");
+});
+
+</script>
+<script>classicScriptRan = true;</script>
+<script type="module">moduleScriptRan = true;</script>
+<script src="resources/async.js" async></script>
+<script src="resources/defer.js" defer></script>
+</body>
diff --git a/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-02.xhtml b/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-02.xhtml
new file mode 100644
index 00000000000..4dcc0ad2421
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/scripting/event-loops/microtask_before_prepare_the_script_element-02.xhtml
@@ -0,0 +1,42 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<link rel="help" href="https://html.spec.whatwg.org/#parsing-xhtml-documents"/>
+<link rel="help" href="https://html.spec.whatwg.org/#perform-a-microtask-checkpoint"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+<![CDATA[
+
+let classicScriptRan = false;
+let moduleScriptRan = false;
+let asyncScriptRan = false;
+let deferSCriptRan = false;
+
+new MutationObserver((mutations, observer) => {
+  mutations.forEach(({ addedNodes }) => {
+    addedNodes.forEach(node => {
+      if (node.nodeType == 1 && node.tagName == "script") {
+        node.setAttribute("type", "text/plain");
+      }
+    });
+  });
+}).observe(document.body, { childList: true, subtree: true });
+
+let test = async_test("Microtask before prepare-the-script-element steps");
+window.onload = test.step_func_done(function(e) {
+  assert_false(classicScriptRan, "Classic script should not run");
+  assert_false(moduleScriptRan, "Module script should not run");
+  assert_false(asyncScriptRan, "Async script should not run");
+  assert_false(deferSCriptRan, "Defer script should not run");
+});
+
+]]>
+</script>
+<script>classicScriptRan = true;</script>
+<script type="module">moduleScriptRan = true;</script>
+<script src="resources/async.js" async=""></script>
+<script src="resources/defer.js" defer=""></script>
+</body>
+</html>
diff --git a/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/async.js b/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/async.js
new file mode 100644
index 00000000000..5b6470d5a44
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/async.js
@@ -0,0 +1 @@
+asyncScriptRan = true;
diff --git a/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/defer.js b/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/defer.js
new file mode 100644
index 00000000000..d8498d274fb
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/scripting/event-loops/resources/defer.js
@@ -0,0 +1 @@
+deferSCriptRan = true;
diff --git a/tests/wpt/tests/interfaces/IndexedDB.idl b/tests/wpt/tests/interfaces/IndexedDB.idl
index d82391da7e6..7c381fe0453 100644
--- a/tests/wpt/tests/interfaces/IndexedDB.idl
+++ b/tests/wpt/tests/interfaces/IndexedDB.idl
@@ -108,10 +108,11 @@ interface IDBObjectStore {
   [NewObject] IDBRequest clear();
   [NewObject] IDBRequest get(any query);
   [NewObject] IDBRequest getKey(any query);
-  [NewObject] IDBRequest getAll(optional any query,
+  [NewObject] IDBRequest getAll(optional any queryOrOptions,
                                 optional [EnforceRange] unsigned long count);
-  [NewObject] IDBRequest getAllKeys(optional any query,
+  [NewObject] IDBRequest getAllKeys(optional any queryOrOptions,
                                     optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest getAllRecords(optional IDBGetAllOptions options = {});
   [NewObject] IDBRequest count(optional any query);
 
   [NewObject] IDBRequest openCursor(optional any query,
@@ -132,6 +133,12 @@ dictionary IDBIndexParameters {
   boolean multiEntry = false;
 };
 
+dictionary IDBGetAllOptions {
+  any query = null;
+  [EnforceRange] unsigned long count;
+  IDBCursorDirection direction = "next";
+};
+
 [Exposed=(Window,Worker)]
 interface IDBIndex {
   attribute DOMString name;
@@ -142,10 +149,11 @@ interface IDBIndex {
 
   [NewObject] IDBRequest get(any query);
   [NewObject] IDBRequest getKey(any query);
-  [NewObject] IDBRequest getAll(optional any query,
+  [NewObject] IDBRequest getAll(optional any queryOrOptions,
                                 optional [EnforceRange] unsigned long count);
-  [NewObject] IDBRequest getAllKeys(optional any query,
+  [NewObject] IDBRequest getAllKeys(optional any queryOrOptions,
                                     optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest getAllRecords(optional IDBGetAllOptions options = {});
   [NewObject] IDBRequest count(optional any query);
 
   [NewObject] IDBRequest openCursor(optional any query,
@@ -173,6 +181,13 @@ interface IDBKeyRange {
   boolean includes(any key);
 };
 
+[Exposed=(Window,Worker)]
+interface IDBRecord {
+  readonly attribute any key;
+  readonly attribute any primaryKey;
+  readonly attribute any value;
+};
+
 [Exposed=(Window,Worker)]
 interface IDBCursor {
   readonly attribute (IDBObjectStore or IDBIndex) source;
diff --git a/tests/wpt/tests/interfaces/cookiestore.idl b/tests/wpt/tests/interfaces/cookiestore.idl
index ecb277756cc..cbcf0712546 100644
--- a/tests/wpt/tests/interfaces/cookiestore.idl
+++ b/tests/wpt/tests/interfaces/cookiestore.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: Cookie Store API (https://cookiestore.spec.whatwg.org/)
+// Source: Cookie Store API Standard (https://cookiestore.spec.whatwg.org/)
 
 [Exposed=(ServiceWorker,Window),
  SecureContext]
@@ -53,12 +53,6 @@ dictionary CookieStoreDeleteOptions {
 dictionary CookieListItem {
   USVString name;
   USVString value;
-  USVString? domain;
-  USVString path;
-  DOMHighResTimeStamp? expires;
-  boolean secure;
-  CookieSameSite sameSite;
-  boolean partitioned;
 };
 
 typedef sequence<CookieListItem> CookieList;
diff --git a/tests/wpt/tests/interfaces/crash-reporting.idl b/tests/wpt/tests/interfaces/crash-reporting.idl
index d10f3573791..60f15bbb44d 100644
--- a/tests/wpt/tests/interfaces/crash-reporting.idl
+++ b/tests/wpt/tests/interfaces/crash-reporting.idl
@@ -4,8 +4,8 @@
 // Source: Crash Reporting (https://wicg.github.io/crash-reporting/)
 
 dictionary CrashReportBody : ReportBody {
-  DOMString? reason;
-  DOMString? stack;
-  boolean? is_top_level;
-  DocumentVisibilityState? page_visibility;
+  DOMString reason;
+  DOMString stack;
+  boolean is_top_level;
+  DocumentVisibilityState page_visibility;
 };
diff --git a/tests/wpt/tests/interfaces/css-typed-om.idl b/tests/wpt/tests/interfaces/css-typed-om.idl
index b0f26ea83c7..0eab6bc7542 100644
--- a/tests/wpt/tests/interfaces/css-typed-om.idl
+++ b/tests/wpt/tests/interfaces/css-typed-om.idl
@@ -45,7 +45,7 @@ interface CSSUnparsedValue : CSSStyleValue {
     iterable<CSSUnparsedSegment>;
     readonly attribute unsigned long length;
     getter CSSUnparsedSegment (unsigned long index);
-    setter CSSUnparsedSegment (unsigned long index, CSSUnparsedSegment val);
+    setter undefined (unsigned long index, CSSUnparsedSegment val);
 };
 
 typedef (USVString or CSSVariableReferenceValue) CSSUnparsedSegment;
@@ -263,7 +263,7 @@ interface CSSTransformValue : CSSStyleValue {
     iterable<CSSTransformComponent>;
     readonly attribute unsigned long length;
     getter CSSTransformComponent (unsigned long index);
-    setter CSSTransformComponent (unsigned long index, CSSTransformComponent val);
+    setter undefined (unsigned long index, CSSTransformComponent val);
 
     readonly attribute boolean is2D;
     DOMMatrix toMatrix();
diff --git a/tests/wpt/tests/interfaces/element-timing.idl b/tests/wpt/tests/interfaces/element-timing.idl
index 4f42823704a..4b556e82779 100644
--- a/tests/wpt/tests/interfaces/element-timing.idl
+++ b/tests/wpt/tests/interfaces/element-timing.idl
@@ -20,5 +20,5 @@ interface PerformanceElementTiming : PerformanceEntry {
 PerformanceElementTiming includes PaintTimingMixin;
 
 partial interface Element {
-    [CEReactions] attribute DOMString elementTiming;
+    [CEReactions, Reflect] attribute DOMString elementTiming;
 };
diff --git a/tests/wpt/tests/interfaces/fedcm.idl b/tests/wpt/tests/interfaces/fedcm.idl
index efc9f41398b..be3bc1b2bd3 100644
--- a/tests/wpt/tests/interfaces/fedcm.idl
+++ b/tests/wpt/tests/interfaces/fedcm.idl
@@ -10,7 +10,7 @@ dictionary IdentityCredentialDisconnectOptions : IdentityProviderConfig {
 [Exposed=Window, SecureContext]
 interface IdentityCredential : Credential {
   static Promise<undefined> disconnect(IdentityCredentialDisconnectOptions options);
-  readonly attribute USVString? token;
+  readonly attribute any token;
   readonly attribute boolean isAutoSelected;
   readonly attribute USVString configURL;
 };
@@ -59,7 +59,6 @@ dictionary IdentityProviderConfig {
 };
 
 dictionary IdentityProviderRequestOptions : IdentityProviderConfig {
-  USVString nonce;
   DOMString loginHint;
   DOMString domainHint;
   sequence<USVString> fields;
@@ -113,7 +112,7 @@ dictionary IdentityProviderAccountList {
 };
 
 dictionary IdentityAssertionResponse {
-  USVString token;
+  any token;
   USVString continue_on;
   IdentityCredentialErrorInit error;
 };
@@ -136,6 +135,6 @@ dictionary IdentityResolveOptions {
 
 [Exposed=Window, SecureContext] interface IdentityProvider {
     static undefined close();
-    static Promise<undefined> resolve(DOMString token, optional IdentityResolveOptions options = {});
+    static Promise<undefined> resolve(any token, optional IdentityResolveOptions options = {});
     static Promise<sequence<IdentityUserInfo>> getUserInfo(IdentityProviderConfig config);
 };
diff --git a/tests/wpt/tests/interfaces/fetch.idl b/tests/wpt/tests/interfaces/fetch.idl
index 965a82d13f5..48149ece73d 100644
--- a/tests/wpt/tests/interfaces/fetch.idl
+++ b/tests/wpt/tests/interfaces/fetch.idl
@@ -116,3 +116,16 @@ enum ResponseType { "basic", "cors", "default", "error", "opaque", "opaqueredire
 partial interface mixin WindowOrWorkerGlobalScope {
   [NewObject] Promise<Response> fetch(RequestInfo input, optional RequestInit init = {});
 };
+
+dictionary DeferredRequestInit : RequestInit {
+  DOMHighResTimeStamp activateAfter;
+};
+
+[Exposed=Window]
+interface FetchLaterResult {
+  readonly attribute boolean activated;
+};
+
+partial interface Window {
+  [NewObject] FetchLaterResult fetchLater(RequestInfo input, optional DeferredRequestInit init = {});
+};
diff --git a/tests/wpt/tests/interfaces/fs.idl b/tests/wpt/tests/interfaces/fs.idl
index 46a59dd1acd..156e9726739 100644
--- a/tests/wpt/tests/interfaces/fs.idl
+++ b/tests/wpt/tests/interfaces/fs.idl
@@ -42,7 +42,7 @@ dictionary FileSystemRemoveOptions {
 
 [Exposed=(Window,Worker), SecureContext, Serializable]
 interface FileSystemDirectoryHandle : FileSystemHandle {
-  async iterable<USVString, FileSystemHandle>;
+  async_iterable<USVString, FileSystemHandle>;
 
   Promise<FileSystemFileHandle> getFileHandle(USVString name, optional FileSystemGetFileOptions options = {});
   Promise<FileSystemDirectoryHandle> getDirectoryHandle(USVString name, optional FileSystemGetDirectoryOptions options = {});
diff --git a/tests/wpt/tests/interfaces/html.idl b/tests/wpt/tests/interfaces/html.idl
index acb1b57ffe8..6a6b85335f2 100644
--- a/tests/wpt/tests/interfaces/html.idl
+++ b/tests/wpt/tests/interfaces/html.idl
@@ -110,21 +110,21 @@ interface HTMLElement : Element {
   [HTMLConstructor] constructor();
 
   // metadata attributes
-  [CEReactions] attribute DOMString title;
-  [CEReactions] attribute DOMString lang;
+  [CEReactions, Reflect] attribute DOMString title;
+  [CEReactions, Reflect] attribute DOMString lang;
   [CEReactions] attribute boolean translate;
   [CEReactions] attribute DOMString dir;
 
   // user interaction
   [CEReactions] attribute (boolean or unrestricted double or DOMString)? hidden;
-  [CEReactions] attribute boolean inert;
+  [CEReactions, Reflect] attribute boolean inert;
   undefined click();
-  [CEReactions] attribute DOMString accessKey;
+  [CEReactions, Reflect] attribute DOMString accessKey;
   readonly attribute DOMString accessKeyLabel;
   [CEReactions] attribute boolean draggable;
   [CEReactions] attribute boolean spellcheck;
-  [CEReactions] attribute DOMString writingSuggestions;
-  [CEReactions] attribute DOMString autocapitalize;
+  [CEReactions, ReflectSetter] attribute DOMString writingSuggestions;
+  [CEReactions, ReflectSetter] attribute DOMString autocapitalize;
   [CEReactions] attribute boolean autocorrect;
 
   [CEReactions] attribute [LegacyNullToEmptyString] DOMString innerText;
@@ -160,8 +160,8 @@ interface mixin HTMLOrSVGElement {
   [SameObject] readonly attribute DOMStringMap dataset;
   attribute DOMString nonce; // intentionally no [CEReactions]
 
-  [CEReactions] attribute boolean autofocus;
-  [CEReactions] attribute long tabIndex;
+  [CEReactions, Reflect] attribute boolean autofocus;
+  [CEReactions, ReflectSetter] attribute long tabIndex;
   undefined focus(optional FocusOptions options = {});
   undefined blur();
 };
@@ -197,29 +197,29 @@ interface HTMLTitleElement : HTMLElement {
 interface HTMLBaseElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString href;
-  [CEReactions] attribute DOMString target;
+  [CEReactions, ReflectSetter] attribute USVString href;
+  [CEReactions, Reflect] attribute DOMString target;
 };
 
 [Exposed=Window]
 interface HTMLLinkElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString href;
+  [CEReactions, ReflectURL] attribute USVString href;
   [CEReactions] attribute DOMString? crossOrigin;
-  [CEReactions] attribute DOMString rel;
+  [CEReactions, Reflect] attribute DOMString rel;
   [CEReactions] attribute DOMString as;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList relList;
-  [CEReactions] attribute DOMString media;
-  [CEReactions] attribute DOMString integrity;
-  [CEReactions] attribute DOMString hreflang;
-  [CEReactions] attribute DOMString type;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList sizes;
-  [CEReactions] attribute USVString imageSrcset;
-  [CEReactions] attribute DOMString imageSizes;
+  [SameObject, PutForwards=value, Reflect="rel"] readonly attribute DOMTokenList relList;
+  [CEReactions, Reflect] attribute DOMString media;
+  [CEReactions, Reflect] attribute DOMString integrity;
+  [CEReactions, Reflect] attribute DOMString hreflang;
+  [CEReactions, Reflect] attribute DOMString type;
+  [SameObject, PutForwards=value, Reflect] readonly attribute DOMTokenList sizes;
+  [CEReactions, Reflect] attribute USVString imageSrcset;
+  [CEReactions, Reflect] attribute DOMString imageSizes;
   [CEReactions] attribute DOMString referrerPolicy;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList blocking;
-  [CEReactions] attribute boolean disabled;
+  [SameObject, PutForwards=value, Reflect] readonly attribute DOMTokenList blocking;
+  [CEReactions, Reflect] attribute boolean disabled;
   [CEReactions] attribute DOMString fetchPriority;
 
   // also has obsolete members
@@ -230,10 +230,10 @@ HTMLLinkElement includes LinkStyle;
 interface HTMLMetaElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString httpEquiv;
-  [CEReactions] attribute DOMString content;
-  [CEReactions] attribute DOMString media;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect="http-equiv"] attribute DOMString httpEquiv;
+  [CEReactions, Reflect] attribute DOMString content;
+  [CEReactions, Reflect] attribute DOMString media;
 
   // also has obsolete members
 };
@@ -243,8 +243,8 @@ interface HTMLStyleElement : HTMLElement {
   [HTMLConstructor] constructor();
 
   attribute boolean disabled;
-  [CEReactions] attribute DOMString media;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList blocking;
+  [CEReactions, Reflect] attribute DOMString media;
+  [SameObject, PutForwards=value, Reflect] readonly attribute DOMTokenList blocking;
 
   // also has obsolete members
 };
@@ -291,16 +291,16 @@ interface HTMLPreElement : HTMLElement {
 interface HTMLQuoteElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString cite;
+  [CEReactions, ReflectURL] attribute USVString cite;
 };
 
 [Exposed=Window]
 interface HTMLOListElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean reversed;
-  [CEReactions] attribute long start;
-  [CEReactions] attribute DOMString type;
+  [CEReactions, Reflect] attribute boolean reversed;
+  [CEReactions, Reflect, ReflectDefault=1] attribute long start;
+  [CEReactions, Reflect] attribute DOMString type;
 
   // also has obsolete members
 };
@@ -323,7 +323,7 @@ interface HTMLMenuElement : HTMLElement {
 interface HTMLLIElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute long value;
+  [CEReactions, Reflect] attribute long value;
 
   // also has obsolete members
 };
@@ -346,13 +346,13 @@ interface HTMLDivElement : HTMLElement {
 interface HTMLAnchorElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString target;
-  [CEReactions] attribute DOMString download;
-  [CEReactions] attribute USVString ping;
-  [CEReactions] attribute DOMString rel;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList relList;
-  [CEReactions] attribute DOMString hreflang;
-  [CEReactions] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString target;
+  [CEReactions, Reflect] attribute DOMString download;
+  [CEReactions, Reflect] attribute USVString ping;
+  [CEReactions, Reflect] attribute DOMString rel;
+  [SameObject, PutForwards=value, Reflect="rel"] readonly attribute DOMTokenList relList;
+  [CEReactions, Reflect] attribute DOMString hreflang;
+  [CEReactions, Reflect] attribute DOMString type;
 
   [CEReactions] attribute DOMString text;
 
@@ -366,14 +366,14 @@ HTMLAnchorElement includes HTMLHyperlinkElementUtils;
 interface HTMLDataElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString value;
+  [CEReactions, Reflect] attribute DOMString value;
 };
 
 [Exposed=Window]
 interface HTMLTimeElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString dateTime;
+  [CEReactions, Reflect] attribute DOMString dateTime;
 };
 
 [Exposed=Window]
@@ -389,7 +389,7 @@ interface HTMLBRElement : HTMLElement {
 };
 
 interface mixin HTMLHyperlinkElementUtils {
-  [CEReactions] stringifier attribute USVString href;
+  [CEReactions, ReflectSetter] stringifier attribute USVString href;
   readonly attribute USVString origin;
   [CEReactions] attribute USVString protocol;
   [CEReactions] attribute USVString username;
@@ -406,8 +406,8 @@ interface mixin HTMLHyperlinkElementUtils {
 interface HTMLModElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString cite;
-  [CEReactions] attribute DOMString dateTime;
+  [CEReactions, ReflectURL] attribute USVString cite;
+  [CEReactions, Reflect] attribute DOMString dateTime;
 };
 
 [Exposed=Window]
@@ -419,13 +419,13 @@ interface HTMLPictureElement : HTMLElement {
 interface HTMLSourceElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute USVString srcset;
-  [CEReactions] attribute DOMString sizes;
-  [CEReactions] attribute DOMString media;
-  [CEReactions] attribute unsigned long width;
-  [CEReactions] attribute unsigned long height;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute DOMString type;
+  [CEReactions, Reflect] attribute USVString srcset;
+  [CEReactions, Reflect] attribute DOMString sizes;
+  [CEReactions, Reflect] attribute DOMString media;
+  [CEReactions, Reflect] attribute unsigned long width;
+  [CEReactions, Reflect] attribute unsigned long height;
 };
 
 [Exposed=Window,
@@ -433,15 +433,15 @@ interface HTMLSourceElement : HTMLElement {
 interface HTMLImageElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString alt;
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute USVString srcset;
-  [CEReactions] attribute DOMString sizes;
+  [CEReactions, Reflect] attribute DOMString alt;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute USVString srcset;
+  [CEReactions, Reflect] attribute DOMString sizes;
   [CEReactions] attribute DOMString? crossOrigin;
-  [CEReactions] attribute DOMString useMap;
-  [CEReactions] attribute boolean isMap;
-  [CEReactions] attribute unsigned long width;
-  [CEReactions] attribute unsigned long height;
+  [CEReactions, Reflect] attribute DOMString useMap;
+  [CEReactions, Reflect] attribute boolean isMap;
+  [CEReactions, ReflectSetter] attribute unsigned long width;
+  [CEReactions, ReflectSetter] attribute unsigned long height;
   readonly attribute unsigned long naturalWidth;
   readonly attribute unsigned long naturalHeight;
   readonly attribute boolean complete;
@@ -460,14 +460,14 @@ interface HTMLImageElement : HTMLElement {
 interface HTMLIFrameElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString src;
+  [CEReactions, ReflectURL] attribute USVString src;
   [CEReactions] attribute (TrustedHTML or DOMString) srcdoc;
-  [CEReactions] attribute DOMString name;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList sandbox;
-  [CEReactions] attribute DOMString allow;
-  [CEReactions] attribute boolean allowFullscreen;
-  [CEReactions] attribute DOMString width;
-  [CEReactions] attribute DOMString height;
+  [CEReactions, Reflect] attribute DOMString name;
+  [SameObject, PutForwards=value, Reflect] readonly attribute DOMTokenList sandbox;
+  [CEReactions, Reflect] attribute DOMString allow;
+  [CEReactions, Reflect] attribute boolean allowFullscreen;
+  [CEReactions, Reflect] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString height;
   [CEReactions] attribute DOMString referrerPolicy;
   [CEReactions] attribute DOMString loading;
   readonly attribute Document? contentDocument;
@@ -481,10 +481,10 @@ interface HTMLIFrameElement : HTMLElement {
 interface HTMLEmbedElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute DOMString width;
-  [CEReactions] attribute DOMString height;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString height;
   Document? getSVGDocument();
 
   // also has obsolete members
@@ -494,12 +494,12 @@ interface HTMLEmbedElement : HTMLElement {
 interface HTMLObjectElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute USVString data;
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute DOMString name;
+  [CEReactions, ReflectURL] attribute USVString data;
+  [CEReactions, Reflect] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString name;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute DOMString width;
-  [CEReactions] attribute DOMString height;
+  [CEReactions, Reflect] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString height;
   readonly attribute Document? contentDocument;
   readonly attribute WindowProxy? contentWindow;
   Document? getSVGDocument();
@@ -518,12 +518,12 @@ interface HTMLObjectElement : HTMLElement {
 interface HTMLVideoElement : HTMLMediaElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute unsigned long width;
-  [CEReactions] attribute unsigned long height;
+  [CEReactions, Reflect] attribute unsigned long width;
+  [CEReactions, Reflect] attribute unsigned long height;
   readonly attribute unsigned long videoWidth;
   readonly attribute unsigned long videoHeight;
-  [CEReactions] attribute USVString poster;
-  [CEReactions] attribute boolean playsInline;
+  [CEReactions, ReflectURL] attribute USVString poster;
+  [CEReactions, Reflect] attribute boolean playsInline;
 };
 
 [Exposed=Window,
@@ -537,10 +537,10 @@ interface HTMLTrackElement : HTMLElement {
   [HTMLConstructor] constructor();
 
   [CEReactions] attribute DOMString kind;
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute DOMString srclang;
-  [CEReactions] attribute DOMString label;
-  [CEReactions] attribute boolean default;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute DOMString srclang;
+  [CEReactions, Reflect] attribute DOMString label;
+  [CEReactions, Reflect] attribute boolean default;
 
   const unsigned short NONE = 0;
   const unsigned short LOADING = 1;
@@ -561,7 +561,7 @@ interface HTMLMediaElement : HTMLElement {
   readonly attribute MediaError? error;
 
   // network state
-  [CEReactions] attribute USVString src;
+  [CEReactions, ReflectURL] attribute USVString src;
   attribute MediaProvider? srcObject;
   readonly attribute USVString currentSrc;
   [CEReactions] attribute DOMString? crossOrigin;
@@ -596,16 +596,16 @@ interface HTMLMediaElement : HTMLElement {
   readonly attribute TimeRanges played;
   readonly attribute TimeRanges seekable;
   readonly attribute boolean ended;
-  [CEReactions] attribute boolean autoplay;
-  [CEReactions] attribute boolean loop;
+  [CEReactions, Reflect] attribute boolean autoplay;
+  [CEReactions, Reflect] attribute boolean loop;
   Promise<undefined> play();
   undefined pause();
 
   // controls
-  [CEReactions] attribute boolean controls;
+  [CEReactions, Reflect] attribute boolean controls;
   attribute double volume;
   attribute boolean muted;
-  [CEReactions] attribute boolean defaultMuted;
+  [CEReactions, Reflect="muted"] attribute boolean defaultMuted;
 
   // tracks
   [SameObject] readonly attribute AudioTrackList audioTracks;
@@ -742,7 +742,7 @@ dictionary TrackEventInit : EventInit {
 interface HTMLMapElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString name;
   [SameObject] readonly attribute HTMLCollection areas;
 };
 
@@ -750,14 +750,14 @@ interface HTMLMapElement : HTMLElement {
 interface HTMLAreaElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString alt;
-  [CEReactions] attribute DOMString coords;
-  [CEReactions] attribute DOMString shape;
-  [CEReactions] attribute DOMString target;
-  [CEReactions] attribute DOMString download;
-  [CEReactions] attribute USVString ping;
-  [CEReactions] attribute DOMString rel;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList relList;
+  [CEReactions, Reflect] attribute DOMString alt;
+  [CEReactions, Reflect] attribute DOMString coords;
+  [CEReactions, Reflect] attribute DOMString shape;
+  [CEReactions, Reflect] attribute DOMString target;
+  [CEReactions, Reflect] attribute DOMString download;
+  [CEReactions, Reflect] attribute USVString ping;
+  [CEReactions, Reflect] attribute DOMString rel;
+  [SameObject, PutForwards=value, Reflect="rel"] readonly attribute DOMTokenList relList;
   [CEReactions] attribute DOMString referrerPolicy;
 
   // also has obsolete members
@@ -801,7 +801,7 @@ interface HTMLTableCaptionElement : HTMLElement {
 interface HTMLTableColElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute unsigned long span;
+  [CEReactions, Reflect, ReflectDefault=1, ReflectRange=(1, 1000)] attribute unsigned long span;
 
   // also has obsolete members
 };
@@ -834,13 +834,13 @@ interface HTMLTableRowElement : HTMLElement {
 interface HTMLTableCellElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute unsigned long colSpan;
-  [CEReactions] attribute unsigned long rowSpan;
-  [CEReactions] attribute DOMString headers;
+  [CEReactions, Reflect, ReflectDefault=1, ReflectRange=(1, 1000)] attribute unsigned long colSpan;
+  [CEReactions, Reflect, ReflectDefault=1, ReflectRange=(0, 65534)] attribute unsigned long rowSpan;
+  [CEReactions, Reflect] attribute DOMString headers;
   readonly attribute long cellIndex;
 
   [CEReactions] attribute DOMString scope; // only conforming for th elements
-  [CEReactions] attribute DOMString abbr;  // only conforming for th elements
+  [CEReactions, Reflect] attribute DOMString abbr;  // only conforming for th elements
 
   // also has obsolete members
 };
@@ -851,17 +851,17 @@ interface HTMLTableCellElement : HTMLElement {
 interface HTMLFormElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString acceptCharset;
-  [CEReactions] attribute USVString action;
+  [CEReactions, Reflect="accept-charset"] attribute DOMString acceptCharset;
+  [CEReactions, ReflectSetter] attribute USVString action;
   [CEReactions] attribute DOMString autocomplete;
   [CEReactions] attribute DOMString enctype;
   [CEReactions] attribute DOMString encoding;
   [CEReactions] attribute DOMString method;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute boolean noValidate;
-  [CEReactions] attribute DOMString target;
-  [CEReactions] attribute DOMString rel;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList relList;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute boolean noValidate;
+  [CEReactions, Reflect] attribute DOMString target;
+  [CEReactions, Reflect] attribute DOMString rel;
+  [SameObject, PutForwards=value, Reflect="rel"] readonly attribute DOMTokenList relList;
 
   [SameObject] readonly attribute HTMLFormControlsCollection elements;
   readonly attribute unsigned long length;
@@ -880,7 +880,7 @@ interface HTMLLabelElement : HTMLElement {
   [HTMLConstructor] constructor();
 
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute DOMString htmlFor;
+  [CEReactions, Reflect="for"] attribute DOMString htmlFor;
   readonly attribute HTMLElement? control;
 };
 
@@ -888,44 +888,44 @@ interface HTMLLabelElement : HTMLElement {
 interface HTMLInputElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString accept;
-  [CEReactions] attribute boolean alpha;
-  [CEReactions] attribute DOMString alt;
-  [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute boolean defaultChecked;
+  [CEReactions, Reflect] attribute DOMString accept;
+  [CEReactions, Reflect] attribute boolean alpha;
+  [CEReactions, Reflect] attribute DOMString alt;
+  [CEReactions, ReflectSetter] attribute DOMString autocomplete;
+  [CEReactions, Reflect="checked"] attribute boolean defaultChecked;
   attribute boolean checked;
   [CEReactions] attribute DOMString colorSpace;
-  [CEReactions] attribute DOMString dirName;
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, Reflect] attribute DOMString dirName;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
   attribute FileList? files;
-  [CEReactions] attribute USVString formAction;
+  [CEReactions, ReflectSetter] attribute USVString formAction;
   [CEReactions] attribute DOMString formEnctype;
   [CEReactions] attribute DOMString formMethod;
-  [CEReactions] attribute boolean formNoValidate;
-  [CEReactions] attribute DOMString formTarget;
-  [CEReactions] attribute unsigned long height;
+  [CEReactions, Reflect] attribute boolean formNoValidate;
+  [CEReactions, Reflect] attribute DOMString formTarget;
+  [CEReactions, ReflectSetter] attribute unsigned long height;
   attribute boolean indeterminate;
   readonly attribute HTMLDataListElement? list;
-  [CEReactions] attribute DOMString max;
-  [CEReactions] attribute long maxLength;
-  [CEReactions] attribute DOMString min;
-  [CEReactions] attribute long minLength;
-  [CEReactions] attribute boolean multiple;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString pattern;
-  [CEReactions] attribute DOMString placeholder;
-  [CEReactions] attribute boolean readOnly;
-  [CEReactions] attribute boolean required;
-  [CEReactions] attribute unsigned long size;
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute DOMString step;
+  [CEReactions, Reflect] attribute DOMString max;
+  [CEReactions, ReflectNonNegative] attribute long maxLength;
+  [CEReactions, Reflect] attribute DOMString min;
+  [CEReactions, ReflectNonNegative] attribute long minLength;
+  [CEReactions, Reflect] attribute boolean multiple;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString pattern;
+  [CEReactions, Reflect] attribute DOMString placeholder;
+  [CEReactions, Reflect] attribute boolean readOnly;
+  [CEReactions, Reflect] attribute boolean required;
+  [CEReactions, Reflect] attribute unsigned long size;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute DOMString step;
   [CEReactions] attribute DOMString type;
-  [CEReactions] attribute DOMString defaultValue;
+  [CEReactions, Reflect="value"] attribute DOMString defaultValue;
   [CEReactions] attribute [LegacyNullToEmptyString] DOMString value;
   attribute object? valueAsDate;
   attribute unrestricted double valueAsNumber;
-  [CEReactions] attribute unsigned long width;
+  [CEReactions, ReflectSetter] attribute unsigned long width;
 
   undefined stepUp(optional long n = 1);
   undefined stepDown(optional long n = 1);
@@ -951,24 +951,24 @@ interface HTMLInputElement : HTMLElement {
 
   // also has obsolete members
 };
-HTMLInputElement includes ElementPopover;
+HTMLInputElement includes PopoverTargetAttributes;
 
 [Exposed=Window]
 interface HTMLButtonElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString command;
-  [CEReactions] attribute Element? commandForElement;
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, ReflectSetter] attribute DOMString command;
+  [CEReactions, Reflect] attribute Element? commandForElement;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute USVString formAction;
+  [CEReactions, ReflectSetter] attribute USVString formAction;
   [CEReactions] attribute DOMString formEnctype;
   [CEReactions] attribute DOMString formMethod;
-  [CEReactions] attribute boolean formNoValidate;
-  [CEReactions] attribute DOMString formTarget;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute DOMString value;
+  [CEReactions, Reflect] attribute boolean formNoValidate;
+  [CEReactions, Reflect] attribute DOMString formTarget;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, ReflectSetter] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString value;
 
   readonly attribute boolean willValidate;
   readonly attribute ValidityState validity;
@@ -979,19 +979,19 @@ interface HTMLButtonElement : HTMLElement {
 
   readonly attribute NodeList labels;
 };
-HTMLButtonElement includes ElementPopover;
+HTMLButtonElement includes PopoverTargetAttributes;
 
 [Exposed=Window]
 interface HTMLSelectElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, ReflectSetter] attribute DOMString autocomplete;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute boolean multiple;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute boolean required;
-  [CEReactions] attribute unsigned long size;
+  [CEReactions, Reflect] attribute boolean multiple;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute boolean required;
+  [CEReactions, Reflect, ReflectDefault=0] attribute unsigned long size;
 
   readonly attribute DOMString type;
 
@@ -1031,8 +1031,8 @@ interface HTMLDataListElement : HTMLElement {
 interface HTMLOptGroupElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean disabled;
-  [CEReactions] attribute DOMString label;
+  [CEReactions, Reflect] attribute boolean disabled;
+  [CEReactions, Reflect] attribute DOMString label;
 };
 
 [Exposed=Window,
@@ -1040,12 +1040,12 @@ interface HTMLOptGroupElement : HTMLElement {
 interface HTMLOptionElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute DOMString label;
-  [CEReactions] attribute boolean defaultSelected;
+  [CEReactions, ReflectSetter] attribute DOMString label;
+  [CEReactions, Reflect="selected"] attribute boolean defaultSelected;
   attribute boolean selected;
-  [CEReactions] attribute DOMString value;
+  [CEReactions, ReflectSetter] attribute DOMString value;
 
   [CEReactions] attribute DOMString text;
   readonly attribute long index;
@@ -1055,19 +1055,19 @@ interface HTMLOptionElement : HTMLElement {
 interface HTMLTextAreaElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute unsigned long cols;
-  [CEReactions] attribute DOMString dirName;
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, ReflectSetter] attribute DOMString autocomplete;
+  [CEReactions, ReflectPositiveWithFallback, ReflectDefault=20] attribute unsigned long cols;
+  [CEReactions, Reflect] attribute DOMString dirName;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute long maxLength;
-  [CEReactions] attribute long minLength;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString placeholder;
-  [CEReactions] attribute boolean readOnly;
-  [CEReactions] attribute boolean required;
-  [CEReactions] attribute unsigned long rows;
-  [CEReactions] attribute DOMString wrap;
+  [CEReactions, ReflectNonNegative] attribute long maxLength;
+  [CEReactions, ReflectNonNegative] attribute long minLength;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString placeholder;
+  [CEReactions, Reflect] attribute boolean readOnly;
+  [CEReactions, Reflect] attribute boolean required;
+  [CEReactions, ReflectPositiveWithFallback, ReflectDefault=2] attribute unsigned long rows;
+  [CEReactions, Reflect] attribute DOMString wrap;
 
   readonly attribute DOMString type;
   [CEReactions] attribute DOMString defaultValue;
@@ -1096,9 +1096,9 @@ interface HTMLTextAreaElement : HTMLElement {
 interface HTMLOutputElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList htmlFor;
+  [SameObject, PutForwards=value, Reflect="for"] readonly attribute DOMTokenList htmlFor;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString name;
 
   readonly attribute DOMString type;
   [CEReactions] attribute DOMString defaultValue;
@@ -1118,8 +1118,8 @@ interface HTMLOutputElement : HTMLElement {
 interface HTMLProgressElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute double value;
-  [CEReactions] attribute double max;
+  [CEReactions, ReflectSetter] attribute double value;
+  [CEReactions, ReflectPositive, ReflectDefault=1.0] attribute double max;
   readonly attribute double position;
   readonly attribute NodeList labels;
 };
@@ -1128,12 +1128,12 @@ interface HTMLProgressElement : HTMLElement {
 interface HTMLMeterElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute double value;
-  [CEReactions] attribute double min;
-  [CEReactions] attribute double max;
-  [CEReactions] attribute double low;
-  [CEReactions] attribute double high;
-  [CEReactions] attribute double optimum;
+  [CEReactions, ReflectSetter] attribute double value;
+  [CEReactions, ReflectSetter] attribute double min;
+  [CEReactions, ReflectSetter] attribute double max;
+  [CEReactions, ReflectSetter] attribute double low;
+  [CEReactions, ReflectSetter] attribute double high;
+  [CEReactions, ReflectSetter] attribute double optimum;
   readonly attribute NodeList labels;
 };
 
@@ -1141,9 +1141,9 @@ interface HTMLMeterElement : HTMLElement {
 interface HTMLFieldSetElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean disabled;
+  [CEReactions, Reflect] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
-  [CEReactions] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString name;
 
   readonly attribute DOMString type;
 
@@ -1166,6 +1166,11 @@ interface HTMLLegendElement : HTMLElement {
   // also has obsolete members
 };
 
+[Exposed=Window]
+interface HTMLSelectedContentElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
 enum SelectionMode {
   "select",
   "start",
@@ -1214,17 +1219,17 @@ dictionary FormDataEventInit : EventInit {
 interface HTMLDetailsElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute boolean open;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute boolean open;
 };
 
 [Exposed=Window]
 interface HTMLDialogElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean open;
+  [CEReactions, Reflect] attribute boolean open;
   attribute DOMString returnValue;
-  [CEReactions] attribute DOMString closedBy;
+  [CEReactions, ReflectSetter] attribute DOMString closedBy;
   [CEReactions] undefined show();
   [CEReactions] undefined showModal();
   [CEReactions] undefined close(optional DOMString returnValue);
@@ -1235,15 +1240,15 @@ interface HTMLDialogElement : HTMLElement {
 interface HTMLScriptElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute boolean noModule;
+  [CEReactions, Reflect] attribute DOMString type;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute boolean noModule;
   [CEReactions] attribute boolean async;
-  [CEReactions] attribute boolean defer;
-  [SameObject, PutForwards=value] readonly attribute DOMTokenList blocking;
+  [CEReactions, Reflect] attribute boolean defer;
+  [SameObject, PutForwards=value, Reflect] readonly attribute DOMTokenList blocking;
   [CEReactions] attribute DOMString? crossOrigin;
   [CEReactions] attribute DOMString referrerPolicy;
-  [CEReactions] attribute DOMString integrity;
+  [CEReactions, Reflect] attribute DOMString integrity;
   [CEReactions] attribute DOMString fetchPriority;
 
   [CEReactions] attribute DOMString text;
@@ -1259,17 +1264,17 @@ interface HTMLTemplateElement : HTMLElement {
 
   readonly attribute DocumentFragment content;
   [CEReactions] attribute DOMString shadowRootMode;
-  [CEReactions] attribute boolean shadowRootDelegatesFocus;
-  [CEReactions] attribute boolean shadowRootClonable;
-  [CEReactions] attribute boolean shadowRootSerializable;
-  [CEReactions] attribute DOMString shadowRootCustomElementRegistry;
+  [CEReactions, Reflect] attribute boolean shadowRootDelegatesFocus;
+  [CEReactions, Reflect] attribute boolean shadowRootClonable;
+  [CEReactions, Reflect] attribute boolean shadowRootSerializable;
+  [CEReactions, Reflect] attribute DOMString shadowRootCustomElementRegistry;
 };
 
 [Exposed=Window]
 interface HTMLSlotElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString name;
   sequence<Node> assignedNodes(optional AssignedNodesOptions options = {});
   sequence<Element> assignedElements(optional AssignedNodesOptions options = {});
   undefined assign((Element or Text)... nodes);
@@ -1793,8 +1798,8 @@ dictionary DragEventInit : MouseEventInit {
   DataTransfer? dataTransfer = null;
 };
 
-interface mixin ElementPopover {
-  [CEReactions] attribute Element? popoverTargetElement;
+interface mixin PopoverTargetAttributes {
+  [CEReactions, Reflect] attribute Element? popoverTargetElement;
   [CEReactions] attribute DOMString popoverTargetAction;
 };
 
@@ -2651,9 +2656,9 @@ interface Worker : EventTarget {
 };
 
 dictionary WorkerOptions {
+  DOMString name = "";
   WorkerType type = "classic";
   RequestCredentials credentials = "same-origin"; // credentials is only used if type is "module"
-  DOMString name = "";
 };
 
 enum WorkerType { "classic", "module" };
@@ -2750,17 +2755,17 @@ dictionary StorageEventInit : EventInit {
 interface HTMLMarqueeElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString behavior;
-  [CEReactions] attribute DOMString bgColor;
-  [CEReactions] attribute DOMString direction;
-  [CEReactions] attribute DOMString height;
-  [CEReactions] attribute unsigned long hspace;
+  [CEReactions, Reflect] attribute DOMString behavior;
+  [CEReactions, Reflect] attribute DOMString bgColor;
+  [CEReactions, Reflect] attribute DOMString direction;
+  [CEReactions, Reflect] attribute DOMString height;
+  [CEReactions, Reflect] attribute unsigned long hspace;
   [CEReactions] attribute long loop;
-  [CEReactions] attribute unsigned long scrollAmount;
-  [CEReactions] attribute unsigned long scrollDelay;
-  [CEReactions] attribute boolean trueSpeed;
-  [CEReactions] attribute unsigned long vspace;
-  [CEReactions] attribute DOMString width;
+  [CEReactions, Reflect, ReflectDefault=6] attribute unsigned long scrollAmount;
+  [CEReactions, Reflect, ReflectDefault=85] attribute unsigned long scrollDelay;
+  [CEReactions, Reflect] attribute boolean trueSpeed;
+  [CEReactions, Reflect] attribute unsigned long vspace;
+  [CEReactions, Reflect] attribute DOMString width;
 
   undefined start();
   undefined stop();
@@ -2770,8 +2775,8 @@ interface HTMLMarqueeElement : HTMLElement {
 interface HTMLFrameSetElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString cols;
-  [CEReactions] attribute DOMString rows;
+  [CEReactions, Reflect] attribute DOMString cols;
+  [CEReactions, Reflect] attribute DOMString rows;
 };
 HTMLFrameSetElement includes WindowEventHandlers;
 
@@ -2779,242 +2784,242 @@ HTMLFrameSetElement includes WindowEventHandlers;
 interface HTMLFrameElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString scrolling;
-  [CEReactions] attribute USVString src;
-  [CEReactions] attribute DOMString frameBorder;
-  [CEReactions] attribute USVString longDesc;
-  [CEReactions] attribute boolean noResize;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString scrolling;
+  [CEReactions, ReflectURL] attribute USVString src;
+  [CEReactions, Reflect] attribute DOMString frameBorder;
+  [CEReactions, ReflectURL] attribute USVString longDesc;
+  [CEReactions, Reflect] attribute boolean noResize;
   readonly attribute Document? contentDocument;
   readonly attribute WindowProxy? contentWindow;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString marginHeight;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString marginWidth;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginHeight;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginWidth;
 };
 
 partial interface HTMLAnchorElement {
-  [CEReactions] attribute DOMString coords;
-  [CEReactions] attribute DOMString charset;
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString rev;
-  [CEReactions] attribute DOMString shape;
+  [CEReactions, Reflect] attribute DOMString coords;
+  [CEReactions, Reflect] attribute DOMString charset;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString rev;
+  [CEReactions, Reflect] attribute DOMString shape;
 };
 
 partial interface HTMLAreaElement {
-  [CEReactions] attribute boolean noHref;
+  [CEReactions, Reflect] attribute boolean noHref;
 };
 
 partial interface HTMLBodyElement {
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString text;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString link;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString vLink;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString aLink;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString bgColor;
-  [CEReactions] attribute DOMString background;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString text;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString link;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString vLink;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString aLink;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, Reflect] attribute DOMString background;
 };
 
 partial interface HTMLBRElement {
-  [CEReactions] attribute DOMString clear;
+  [CEReactions, Reflect] attribute DOMString clear;
 };
 
 partial interface HTMLTableCaptionElement {
-  [CEReactions] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString align;
 };
 
 partial interface HTMLTableColElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString ch;
-  [CEReactions] attribute DOMString chOff;
-  [CEReactions] attribute DOMString vAlign;
-  [CEReactions] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect="char"] attribute DOMString ch;
+  [CEReactions, Reflect="charoff"] attribute DOMString chOff;
+  [CEReactions, Reflect] attribute DOMString vAlign;
+  [CEReactions, Reflect] attribute DOMString width;
 };
 
 [Exposed=Window]
 interface HTMLDirectoryElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute boolean compact;
+  [CEReactions, Reflect] attribute boolean compact;
 };
 
 partial interface HTMLDivElement {
-  [CEReactions] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString align;
 };
 
 partial interface HTMLDListElement {
-  [CEReactions] attribute boolean compact;
+  [CEReactions, Reflect] attribute boolean compact;
 };
 
 partial interface HTMLEmbedElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString name;
 };
 
 [Exposed=Window]
 interface HTMLFontElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString color;
-  [CEReactions] attribute DOMString face;
-  [CEReactions] attribute DOMString size;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString color;
+  [CEReactions, Reflect] attribute DOMString face;
+  [CEReactions, Reflect] attribute DOMString size;
 };
 
 partial interface HTMLHeadingElement {
-  [CEReactions] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString align;
 };
 
 partial interface HTMLHRElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString color;
-  [CEReactions] attribute boolean noShade;
-  [CEReactions] attribute DOMString size;
-  [CEReactions] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString color;
+  [CEReactions, Reflect] attribute boolean noShade;
+  [CEReactions, Reflect] attribute DOMString size;
+  [CEReactions, Reflect] attribute DOMString width;
 };
 
 partial interface HTMLHtmlElement {
-  [CEReactions] attribute DOMString version;
+  [CEReactions, Reflect] attribute DOMString version;
 };
 
 partial interface HTMLIFrameElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString scrolling;
-  [CEReactions] attribute DOMString frameBorder;
-  [CEReactions] attribute USVString longDesc;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString scrolling;
+  [CEReactions, Reflect] attribute DOMString frameBorder;
+  [CEReactions, ReflectURL] attribute USVString longDesc;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString marginHeight;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString marginWidth;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginHeight;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString marginWidth;
 };
 
 partial interface HTMLImageElement {
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute USVString lowsrc;
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute unsigned long hspace;
-  [CEReactions] attribute unsigned long vspace;
-  [CEReactions] attribute USVString longDesc;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, ReflectURL] attribute USVString lowsrc;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute unsigned long hspace;
+  [CEReactions, Reflect] attribute unsigned long vspace;
+  [CEReactions, ReflectURL] attribute USVString longDesc;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString border;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString border;
 };
 
 partial interface HTMLInputElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString useMap;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString useMap;
 };
 
 partial interface HTMLLegendElement {
-  [CEReactions] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString align;
 };
 
 partial interface HTMLLIElement {
-  [CEReactions] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString type;
 };
 
 partial interface HTMLLinkElement {
-  [CEReactions] attribute DOMString charset;
-  [CEReactions] attribute DOMString rev;
-  [CEReactions] attribute DOMString target;
+  [CEReactions, Reflect] attribute DOMString charset;
+  [CEReactions, Reflect] attribute DOMString rev;
+  [CEReactions, Reflect] attribute DOMString target;
 };
 
 partial interface HTMLMenuElement {
-  [CEReactions] attribute boolean compact;
+  [CEReactions, Reflect] attribute boolean compact;
 };
 
 partial interface HTMLMetaElement {
-  [CEReactions] attribute DOMString scheme;
+  [CEReactions, Reflect] attribute DOMString scheme;
 };
 
 partial interface HTMLObjectElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString archive;
-  [CEReactions] attribute DOMString code;
-  [CEReactions] attribute boolean declare;
-  [CEReactions] attribute unsigned long hspace;
-  [CEReactions] attribute DOMString standby;
-  [CEReactions] attribute unsigned long vspace;
-  [CEReactions] attribute DOMString codeBase;
-  [CEReactions] attribute DOMString codeType;
-  [CEReactions] attribute DOMString useMap;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString archive;
+  [CEReactions, Reflect] attribute DOMString code;
+  [CEReactions, Reflect] attribute boolean declare;
+  [CEReactions, Reflect] attribute unsigned long hspace;
+  [CEReactions, Reflect] attribute DOMString standby;
+  [CEReactions, Reflect] attribute unsigned long vspace;
+  [CEReactions, ReflectURL] attribute DOMString codeBase;
+  [CEReactions, Reflect] attribute DOMString codeType;
+  [CEReactions, Reflect] attribute DOMString useMap;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString border;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString border;
 };
 
 partial interface HTMLOListElement {
-  [CEReactions] attribute boolean compact;
+  [CEReactions, Reflect] attribute boolean compact;
 };
 
 partial interface HTMLParagraphElement {
-  [CEReactions] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString align;
 };
 
 [Exposed=Window]
 interface HTMLParamElement : HTMLElement {
   [HTMLConstructor] constructor();
 
-  [CEReactions] attribute DOMString name;
-  [CEReactions] attribute DOMString value;
-  [CEReactions] attribute DOMString type;
-  [CEReactions] attribute DOMString valueType;
+  [CEReactions, Reflect] attribute DOMString name;
+  [CEReactions, Reflect] attribute DOMString value;
+  [CEReactions, Reflect] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString valueType;
 };
 
 partial interface HTMLPreElement {
-  [CEReactions] attribute long width;
+  [CEReactions, Reflect] attribute long width;
 };
 
 partial interface HTMLStyleElement {
-  [CEReactions] attribute DOMString type;
+  [CEReactions, Reflect] attribute DOMString type;
 };
 
 partial interface HTMLScriptElement {
-  [CEReactions] attribute DOMString charset;
-  [CEReactions] attribute DOMString event;
-  [CEReactions] attribute DOMString htmlFor;
+  [CEReactions, Reflect] attribute DOMString charset;
+  [CEReactions, Reflect] attribute DOMString event;
+  [CEReactions, Reflect="for"] attribute DOMString htmlFor;
 };
 
 partial interface HTMLTableElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString border;
-  [CEReactions] attribute DOMString frame;
-  [CEReactions] attribute DOMString rules;
-  [CEReactions] attribute DOMString summary;
-  [CEReactions] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString border;
+  [CEReactions, Reflect] attribute DOMString frame;
+  [CEReactions, Reflect] attribute DOMString rules;
+  [CEReactions, Reflect] attribute DOMString summary;
+  [CEReactions, Reflect] attribute DOMString width;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString bgColor;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString cellPadding;
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString cellSpacing;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString cellPadding;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString cellSpacing;
 };
 
 partial interface HTMLTableSectionElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString ch;
-  [CEReactions] attribute DOMString chOff;
-  [CEReactions] attribute DOMString vAlign;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect="char"] attribute DOMString ch;
+  [CEReactions, Reflect="charoff"] attribute DOMString chOff;
+  [CEReactions, Reflect] attribute DOMString vAlign;
 };
 
 partial interface HTMLTableCellElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString axis;
-  [CEReactions] attribute DOMString height;
-  [CEReactions] attribute DOMString width;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect] attribute DOMString axis;
+  [CEReactions, Reflect] attribute DOMString height;
+  [CEReactions, Reflect] attribute DOMString width;
 
-  [CEReactions] attribute DOMString ch;
-  [CEReactions] attribute DOMString chOff;
-  [CEReactions] attribute boolean noWrap;
-  [CEReactions] attribute DOMString vAlign;
+  [CEReactions, Reflect="char"] attribute DOMString ch;
+  [CEReactions, Reflect="charoff"] attribute DOMString chOff;
+  [CEReactions, Reflect] attribute boolean noWrap;
+  [CEReactions, Reflect] attribute DOMString vAlign;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString bgColor;
 };
 
 partial interface HTMLTableRowElement {
-  [CEReactions] attribute DOMString align;
-  [CEReactions] attribute DOMString ch;
-  [CEReactions] attribute DOMString chOff;
-  [CEReactions] attribute DOMString vAlign;
+  [CEReactions, Reflect] attribute DOMString align;
+  [CEReactions, Reflect="char"] attribute DOMString ch;
+  [CEReactions, Reflect="charoff"] attribute DOMString chOff;
+  [CEReactions, Reflect] attribute DOMString vAlign;
 
-  [CEReactions] attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, Reflect] attribute [LegacyNullToEmptyString] DOMString bgColor;
 };
 
 partial interface HTMLUListElement {
-  [CEReactions] attribute boolean compact;
-  [CEReactions] attribute DOMString type;
+  [CEReactions, Reflect] attribute boolean compact;
+  [CEReactions, Reflect] attribute DOMString type;
 };
 
 partial interface Document {
diff --git a/tests/wpt/tests/interfaces/largest-contentful-paint.idl b/tests/wpt/tests/interfaces/largest-contentful-paint.idl
index d1630cc7daa..4eb5c7fa475 100644
--- a/tests/wpt/tests/interfaces/largest-contentful-paint.idl
+++ b/tests/wpt/tests/interfaces/largest-contentful-paint.idl
@@ -6,6 +6,7 @@
 [Exposed=Window]
 interface LargestContentfulPaint : PerformanceEntry {
     readonly attribute DOMHighResTimeStamp loadTime;
+    readonly attribute DOMHighResTimeStamp renderTime;
     readonly attribute unsigned long size;
     readonly attribute DOMString id;
     readonly attribute DOMString url;
diff --git a/tests/wpt/tests/interfaces/mediaqueries-5.idl b/tests/wpt/tests/interfaces/mediaqueries-5.idl
index 52154c96725..c951c356ca3 100644
--- a/tests/wpt/tests/interfaces/mediaqueries-5.idl
+++ b/tests/wpt/tests/interfaces/mediaqueries-5.idl
@@ -3,6 +3,14 @@
 // (https://github.com/w3c/webref)
 // Source: Media Queries Level 5 (https://drafts.csswg.org/mediaqueries-5/)
 
+typedef (MediaList or boolean) CustomMediaQuery;
+
+[Exposed=Window]
+interface CSSCustomMediaRule : CSSRule {
+    readonly attribute CSSOMString name;
+    readonly attribute CustomMediaQuery query;
+};
+
 [Exposed=Window, SecureContext]
 partial interface Navigator {
   [SameObject] readonly attribute PreferenceManager preferences;
diff --git a/tests/wpt/tests/interfaces/notifications.idl b/tests/wpt/tests/interfaces/notifications.idl
index 4300b171071..eeb26424bce 100644
--- a/tests/wpt/tests/interfaces/notifications.idl
+++ b/tests/wpt/tests/interfaces/notifications.idl
@@ -21,6 +21,7 @@ interface Notification : EventTarget {
   readonly attribute NotificationDirection dir;
   readonly attribute DOMString lang;
   readonly attribute DOMString body;
+  readonly attribute USVString navigate;
   readonly attribute DOMString tag;
   readonly attribute USVString image;
   readonly attribute USVString icon;
@@ -40,6 +41,7 @@ dictionary NotificationOptions {
   NotificationDirection dir = "auto";
   DOMString lang = "";
   DOMString body = "";
+  USVString navigate;
   DOMString tag = "";
   USVString image;
   USVString icon;
@@ -68,6 +70,7 @@ enum NotificationDirection {
 dictionary NotificationAction {
   required DOMString action;
   required DOMString title;
+  USVString navigate;
   USVString icon;
 };
 
diff --git a/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl b/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
index 666460bbbb5..2cf43b1e9bc 100644
--- a/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
+++ b/tests/wpt/tests/interfaces/privacy-preserving-attribution.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: Attribution Level 1 (https://w3c.github.io/ppa/)
+// Source: Attribution Level 1 (https://w3c.github.io/attribution/)
 
 partial interface Navigator {
   [SecureContext, SameObject] readonly attribute Attribution attribution;
diff --git a/tests/wpt/tests/interfaces/push-api.idl b/tests/wpt/tests/interfaces/push-api.idl
index b16a730b722..a1de7a416b6 100644
--- a/tests/wpt/tests/interfaces/push-api.idl
+++ b/tests/wpt/tests/interfaces/push-api.idl
@@ -73,14 +73,16 @@ partial interface ServiceWorkerGlobalScope {
 interface PushEvent : ExtendableEvent {
   constructor(DOMString type, optional PushEventInit eventInitDict = {});
   readonly attribute PushMessageData? data;
+  readonly attribute Notification? notification;
+};
+
+dictionary PushEventInit : ExtendableEventInit {
+  PushMessageDataInit? data = null;
+  Notification? notification = null;
 };
 
 typedef (BufferSource or USVString) PushMessageDataInit;
 
-dictionary PushEventInit : ExtendableEventInit {
-  PushMessageDataInit data;
-};
-
 [Exposed=ServiceWorker, SecureContext]
 interface PushSubscriptionChangeEvent : ExtendableEvent {
   constructor(DOMString type, optional PushSubscriptionChangeEventInit eventInitDict = {});
diff --git a/tests/wpt/tests/interfaces/shared-storage.idl b/tests/wpt/tests/interfaces/shared-storage.idl
index e3e221a3aa7..d44997faf19 100644
--- a/tests/wpt/tests/interfaces/shared-storage.idl
+++ b/tests/wpt/tests/interfaces/shared-storage.idl
@@ -105,7 +105,7 @@ interface SharedStorage {
   Promise<double> remainingBudget();
 
   [Exposed=SharedStorageWorklet]
-  async iterable<DOMString, DOMString>;
+  async_iterable<DOMString, DOMString>;
 };
 
 dictionary SharedStoragePrivateAggregationConfig {
diff --git a/tests/wpt/tests/interfaces/streams.idl b/tests/wpt/tests/interfaces/streams.idl
index ab9be033e43..8abc8f5cfda 100644
--- a/tests/wpt/tests/interfaces/streams.idl
+++ b/tests/wpt/tests/interfaces/streams.idl
@@ -17,7 +17,7 @@ interface ReadableStream {
   Promise<undefined> pipeTo(WritableStream destination, optional StreamPipeOptions options = {});
   sequence<ReadableStream> tee();
 
-  async iterable<any>(optional ReadableStreamIteratorOptions options = {});
+  async_iterable<any>(optional ReadableStreamIteratorOptions options = {});
 };
 
 typedef (ReadableStreamDefaultReader or ReadableStreamBYOBReader) ReadableStreamReader;
diff --git a/tests/wpt/tests/interfaces/webidl.idl b/tests/wpt/tests/interfaces/webidl.idl
index f3db91096ac..651c1922115 100644
--- a/tests/wpt/tests/interfaces/webidl.idl
+++ b/tests/wpt/tests/interfaces/webidl.idl
@@ -3,6 +3,19 @@
 // (https://github.com/w3c/webref)
 // Source: Web IDL Standard (https://webidl.spec.whatwg.org/)
 
+[Exposed=*, Serializable]
+interface QuotaExceededError : DOMException {
+  constructor(optional DOMString message = "", optional QuotaExceededErrorOptions options = {});
+
+  readonly attribute double? quota;
+  readonly attribute double? requested;
+};
+
+dictionary QuotaExceededErrorOptions {
+  double quota;
+  double requested;
+};
+
 typedef (Int8Array or Int16Array or Int32Array or
          Uint8Array or Uint16Array or Uint32Array or Uint8ClampedArray or
          BigInt64Array or BigUint64Array or
diff --git a/tests/wpt/tests/interfaces/webnn.idl b/tests/wpt/tests/interfaces/webnn.idl
index 8d0e485bc76..3490f40e832 100644
--- a/tests/wpt/tests/interfaces/webnn.idl
+++ b/tests/wpt/tests/interfaces/webnn.idl
@@ -369,6 +369,8 @@ partial interface MLGraphBuilder {
   MLOperand logicalXor(MLOperand a,
                        MLOperand b,
                        optional MLOperatorOptions options = {});
+  MLOperand isNaN(MLOperand a, optional MLOperatorOptions options = {});
+  MLOperand isInfinite(MLOperand a, optional MLOperatorOptions options = {});
 };
 
 dictionary MLLogicalNotSupportLimits {
@@ -387,6 +389,8 @@ partial dictionary MLOpSupportLimits {
   MLBinarySupportLimits logicalAnd;
   MLBinarySupportLimits logicalOr;
   MLBinarySupportLimits logicalXor;
+  MLLogicalNotSupportLimits isNaN;
+  MLLogicalNotSupportLimits isInfinite;
 };
 
 partial interface MLGraphBuilder {
@@ -400,6 +404,7 @@ partial interface MLGraphBuilder {
   MLOperand log(MLOperand input, optional MLOperatorOptions options = {});
   MLOperand neg(MLOperand input, optional MLOperatorOptions options = {});
   MLOperand reciprocal(MLOperand input, optional MLOperatorOptions options = {});
+  MLOperand roundEven(MLOperand input, optional MLOperatorOptions options = {});
   MLOperand sin(MLOperand input, optional MLOperatorOptions options = {});
   MLOperand sign(MLOperand input, optional MLOperatorOptions options = {});
   MLOperand sqrt(MLOperand input, optional MLOperatorOptions options = {});
@@ -417,6 +422,7 @@ partial dictionary MLOpSupportLimits {
   MLSingleInputSupportLimits log;
   MLSingleInputSupportLimits neg;
   MLSingleInputSupportLimits reciprocal;
+  MLSingleInputSupportLimits roundEven;
   MLSingleInputSupportLimits sin;
   MLSingleInputSupportLimits sign;
   MLSingleInputSupportLimits sqrt;
diff --git a/tests/wpt/tests/interfaces/webrtc-identity.idl b/tests/wpt/tests/interfaces/webrtc-identity.idl
index 108c3ad9b11..69597acea62 100644
--- a/tests/wpt/tests/interfaces/webrtc-identity.idl
+++ b/tests/wpt/tests/interfaces/webrtc-identity.idl
@@ -19,7 +19,7 @@ dictionary RTCIdentityProvider {
 };
 
 callback GenerateAssertionCallback = Promise<RTCIdentityAssertionResult>
-(DOMString contents, DOMString origin, RTCIdentityProviderOptions options);
+(DOMString contents, DOMString origin, optional RTCIdentityProviderOptions options = {});
 
 callback ValidateAssertionCallback = Promise<RTCIdentityValidationResult>
 (DOMString assertion, DOMString origin);
diff --git a/tests/wpt/tests/interfaces/webrtc-stats.idl b/tests/wpt/tests/interfaces/webrtc-stats.idl
index 13f74c110d0..b5eff2d0bf5 100644
--- a/tests/wpt/tests/interfaces/webrtc-stats.idl
+++ b/tests/wpt/tests/interfaces/webrtc-stats.idl
@@ -117,7 +117,6 @@ dictionary RTCRemoteInboundRtpStreamStats : RTCReceivedRtpStreamStats {
 dictionary RTCSentRtpStreamStats : RTCRtpStreamStats {
             unsigned long long packetsSent;
             unsigned long long bytesSent;
-            unsigned long long packetsSentWithEct1;
 };
 
 dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
@@ -154,6 +153,7 @@ dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
              boolean              powerEfficientEncoder;
              boolean              active;
              DOMString            scalabilityMode;
+             unsigned long long   packetsSentWithEct1;
 };
 
 enum RTCQualityLimitationReason {
diff --git a/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005-ref.html b/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005-ref.html
index cf722603e1d..c71d48b898f 100644
--- a/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005-ref.html
+++ b/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005-ref.html
@@ -1,11 +1,22 @@
 <!DOCTYPE html>
 <title>&lt;semantics&gt - mozilla bug 21479 (reference)</title>
 <meta charset="utf-8"/>
+<style>
+@font-face {
+  font-family: operators;
+  src: url("/fonts/math/operators.woff");
+}
+math, math * {
+  font-family: operators;
+  font-size: 32px;
+  color: purple;
+}
+</style>
 <p>
   <math xmlns="http://www.w3.org/1998/Math/MathML">
     <mover>
-      <mspace width="300px" height="10px" mathbackground="black"></mspace>
-      <mo>&#xaf;</mo>
+      <mspace width="300px" height="10px" mathbackground="blue"></mspace>
+      <mo>&#x21AC;<!-- Rightwards Arrow With Loop --></mo>
     </mover>
   </math>
 </p>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005.html b/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005.html
index e4fe611c475..55c99f268aa 100644
--- a/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005.html
+++ b/tests/wpt/tests/mathml/presentation-markup/mrow/semantics-005.html
@@ -3,13 +3,24 @@
 <meta charset="utf-8"/>
 <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=21479">
 <link rel="help" href="https://w3c.github.io/mathml-core/#semantics-and-presentation">
+<style>
+@font-face {
+  font-family: operators;
+  src: url("/fonts/math/operators.woff");
+}
+math, math * {
+  font-family: operators;
+  font-size: 32px;
+  color: purple;
+}
+</style>
 <link rel="match" href="semantics-005-ref.html">
 <meta name="assert" content="The embellished operator made of a single mo inside a semantics element is treated the same as the mo alone.">
 <p>
   <math xmlns="http://www.w3.org/1998/Math/MathML">
     <mover>
-      <mspace width="300px" height="10px" mathbackground="black"></mspace>
-      <semantics><mo>&#xaf;</mo></semantics>
+      <mspace width="300px" height="10px" mathbackground="blue"></mspace>
+      <semantics><mo>&#x21AC<!-- Rightwards Arrow With Loop --></mo></semantics>
     </mover>
   </math>
 </p>
diff --git a/tests/wpt/tests/mathml/presentation-markup/scripts/cramped-001.html b/tests/wpt/tests/mathml/presentation-markup/scripts/cramped-001.html
index e03b4d968d2..678897e8daf 100644
--- a/tests/wpt/tests/mathml/presentation-markup/scripts/cramped-001.html
+++ b/tests/wpt/tests/mathml/presentation-markup/scripts/cramped-001.html
@@ -145,7 +145,7 @@
           assert_cramped("css-002", true);
           assert_cramped("css-003", true);
           assert_cramped("css-004", false);
-      }, "element with specified CSS math-style");
+      }, "element with specified CSS math-shift");
 
       done();
   }
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-computed.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-computed.html
new file mode 100644
index 00000000000..075bc6f36fd
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-depth with computed values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-script-level-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<math id="target"></math>
+<script>
+  test_computed_value("math-depth", "0");
+  test_computed_value("math-depth", "1");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-invalid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-invalid.html
new file mode 100644
index 00000000000..2220ef8f761
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-invalid.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-depth with invalid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-script-level-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_invalid_value("math-depth", "auto");
+  test_invalid_value("math-depth", "invalid");
+  test_invalid_value("math-depth", "add");
+  test_invalid_value("math-depth", "add(0.5)");
+  test_invalid_value("math-depth", "add(1px)");
+  test_invalid_value("math-depth", "0.5");
+  test_invalid_value("math-depth", "1px");
+  test_invalid_value("math-depth", "auto-add add(1)");
+  test_invalid_value("math-depth", "auto-add 1");
+  test_invalid_value("math-depth", "add(1) 1");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-valid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-valid.html
new file mode 100644
index 00000000000..b4401873690
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-depth-valid.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-depth with valid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-script-level-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_valid_value("math-depth", "auto-add");
+  test_valid_value("math-depth", "add(0)");
+  test_valid_value("math-depth", "add(1)");
+  test_valid_value("math-depth", "0");
+  test_valid_value("math-depth", "1");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-computed.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-computed.html
new file mode 100644
index 00000000000..f95214f3708
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-shift with computed values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-shift">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<math id="target"></math>
+<script>
+  test_computed_value("math-shift", "normal");
+  test_computed_value("math-shift", "compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-invalid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-invalid.html
new file mode 100644
index 00000000000..4fbd4b62e9d
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-invalid.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-shift with invalid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-shift">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_invalid_value("math-shift", "auto");
+  test_invalid_value("math-shift", "invalid");
+  test_invalid_value("math-shift", "normal compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-valid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-valid.html
new file mode 100644
index 00000000000..a9949930fc1
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-shift-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-shift with valid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-shift">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_valid_value("math-shift", "normal");
+  test_valid_value("math-shift", "compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-computed.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-computed.html
new file mode 100644
index 00000000000..3bf9ee5823c
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-style with computed values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-style-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<math id="target"></math>
+<script>
+  test_computed_value("math-style", "normal");
+  test_computed_value("math-style", "compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-invalid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-invalid.html
new file mode 100644
index 00000000000..e5ce54953ae
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-invalid.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-style with invalid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-style-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_invalid_value("math-style", "auto");
+  test_invalid_value("math-style", "invalid");
+  test_invalid_value("math-style", "normal compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-valid.html b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-valid.html
new file mode 100644
index 00000000000..dd6a409e935
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/css-styling/parsing/math-style-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>MathML Core: parsing math-style with valid values</title>
+<link rel="author" title="Eri Pazos" href="mailto:eri@igalia.com">
+<link rel="help" href="https://w3c.github.io/mathml-core/#the-math-style-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+  test_valid_value("math-style", "normal");
+  test_valid_value("math-style", "compact");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/navigation-api/navigate-event/navigate-multiple-navigation-navigate.html b/tests/wpt/tests/navigation-api/navigate-event/navigate-multiple-navigation-navigate.html
new file mode 100644
index 00000000000..47d78c84ea5
--- /dev/null
+++ b/tests/wpt/tests/navigation-api/navigate-event/navigate-multiple-navigation-navigate.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<form id="form" action=""></form>
+<script>
+async_test(t => {
+  const expected = [
+    "navigate #1",
+    "navigateerror #1",
+    "navigate #3",
+    "navigateerror #3",
+    "navigate #2",
+    "navigatesuccess #2"
+  ];
+
+  const result = [];
+  navigation.onnavigate = t.step_func(e => {
+    result.push(`${e.type} ${new URL(e.destination.url).hash}`);
+  });
+
+  navigation.onnavigateerror = t.step_func(e => {
+    result.push(`${e.type} ${new URL(navigation.currentEntry.url).hash}`);
+
+    if (navigation.currentEntry.url.endsWith("#1")) {
+      navigation.navigate("#3");
+    }
+  });
+
+  navigation.onnavigatesuccess = t.step_func_done(e => {
+    result.push(`${e.type} ${new URL(navigation.currentEntry.url).hash}`);
+    assert_array_equals(result, expected);
+  });
+
+  navigation.navigate("#1");
+  navigation.navigate("#2");
+
+}, "navigation.navigate() multiple times gives correct event order");
+</script>
diff --git a/tests/wpt/tests/orientation-sensor/AbsoluteOrientationSensor-iframe-access.https.html b/tests/wpt/tests/orientation-sensor/AbsoluteOrientationSensor-iframe-access.https.html
index 599bff7b4a3..5446e73c523 100644
--- a/tests/wpt/tests/orientation-sensor/AbsoluteOrientationSensor-iframe-access.https.html
+++ b/tests/wpt/tests/orientation-sensor/AbsoluteOrientationSensor-iframe-access.https.html
@@ -1,5 +1,6 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<meta name="timeout" content="long">
 <title>AbsoluteOrientationSensor iframe test</title>
 <link rel="author" title="Intel" href="http://www.intel.com">
 <link rel="help" href="https://www.w3.org/TR/orientation-sensor/">
diff --git a/tests/wpt/tests/pointerevents/pointerevent_boundary_events_attributes_during_drag.html b/tests/wpt/tests/pointerevents/pointerevent_boundary_events_attributes_during_drag.html
new file mode 100644
index 00000000000..04a758d1dba
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_boundary_events_attributes_during_drag.html
@@ -0,0 +1,166 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Attributes of boundary events during dragging mouse</title>
+<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>
+<style>
+div.target {
+  margin: 0;
+  width: 100%;
+  height: 16px;
+}
+</style>
+<script>
+"use strict";
+
+addEventListener("load", () => {
+  promise_test(async () => {
+    const body = document.body;
+    for (let i = 0; i < 6; i++) {
+      const div = document.createElement("div");
+      div.setAttribute("class", "target");
+      div.setAttribute("id", `div${i}`);
+      body.appendChild(div);
+    }
+    body.firstElementChild.getBoundingClientRect();
+
+    let record = false;
+    const mouseEvents = [], pointerEvents = [];
+    function recordEvent(event) {
+      if (!record || !event.target.id) {
+        return;
+      }
+      const e = {
+        type: event.type,
+        target: `<${event.target.localName} id="${event.target.id}">`,
+        button: event.button,
+        buttons: event.buttons,
+        pointerId: event.pointerId,
+        pointerType: event.pointerType,
+      };
+      if (event.pointerId != undefined) {
+        pointerEvents.push(e);
+      } else {
+        mouseEvents.push(e);
+      }
+    }
+    for (const type of ["mouseover", "mouseout", "mouseenter", "mouseleave",
+                        "pointerover", "pointerout", "pointerenter", "pointerleave"]) {
+      body.addEventListener(type, recordEvent, {capture: true});
+    }
+    let pointerId = 0;
+    body.addEventListener("pointerdown", event => {
+      record = true;
+      pointerId = event.pointerId;
+    }, {once: true, capture: true});
+    body.addEventListener("pointerup", event => {
+      record = false;
+    }, {once: true, capture: true});
+    body.addEventListener("dragstart", event => {
+      // We want to check the boundary events during a drag so that we want
+      // a native drag session.
+      event.preventDefault();
+    }, {once: true, capture: true});
+
+    document.getElementById("div3").addEventListener("pointerenter", event => {
+      requestAnimationFrame(() => {
+        // Remove div3 causes moving div4 underneath the cursor
+        event.target.remove();
+        document.getElementById("div4").getBoundingClientRect();
+      });
+    }, {once: true, capture: true});
+    document.getElementById("div4").addEventListener("pointerenter", event => {
+      requestAnimationFrame(() => {
+        // Remove div4 causes moving div5 underneath the cursor
+        event.target.remove();
+        document.getElementById("div5").getBoundingClientRect();
+      });
+    }, {once: true, capture: true});
+
+    await new test_driver.Actions()
+      .pointerMove(0, 0, { origin: document.getElementById("div0") })
+      .pointerDown()
+      .pointerMove(0, 0, { origin: document.getElementById("div1") })
+      .pointerMove(0, 0, { origin: document.getElementById("div2") })
+      .pointerMove(0, 0, { origin: document.getElementById("div3") })
+      .pause(500)
+      .pointerUp()
+      .send();
+
+    function stringifyEvent(event) {
+      return event.pointerId != undefined
+        ? `{ type: "${event.type}", target: ${event.target}, button: ${event.button}, buttons: ${
+            event.buttons
+          }, pointerId: ${event.pointerId}, pointerType: "${event.pointerType}"}`
+        : `{ type: "${event.type}", target: ${event.target}, button: ${event.button}, buttons: ${
+            event.buttons
+          }`;
+    }
+    function stringifyEvents(events) {
+      let str = "[";
+      for (const event of events) {
+        if (str != "[") {
+          str += ", ";
+        }
+        str += stringifyEvent(event);
+      }
+      return str + "]";
+    }
+
+    test(() => {
+      assert_equals(
+        stringifyEvents(mouseEvents),
+        stringifyEvents([
+          { type: "mouseout",   target: '<div id="div0">', buttons: 1, button: 0 },
+          { type: "mouseleave", target: '<div id="div0">', buttons: 1, button: 0 },
+          { type: "mouseover",  target: '<div id="div1">', buttons: 1, button: 0 },
+          { type: "mouseenter", target: '<div id="div1">', buttons: 1, button: 0 },
+          { type: "mouseout",   target: '<div id="div1">', buttons: 1, button: 0 },
+          { type: "mouseleave", target: '<div id="div1">', buttons: 1, button: 0 },
+          { type: "mouseover",  target: '<div id="div2">', buttons: 1, button: 0 },
+          { type: "mouseenter", target: '<div id="div2">', buttons: 1, button: 0 },
+          { type: "mouseout",   target: '<div id="div2">', buttons: 1, button: 0 },
+          { type: "mouseleave", target: '<div id="div2">', buttons: 1, button: 0 },
+          { type: "mouseover",  target: '<div id="div3">', buttons: 1, button: 0 },
+          { type: "mouseenter", target: '<div id="div3">', buttons: 1, button: 0 },
+          { type: "mouseover",  target: '<div id="div4">', buttons: 1, button: 0 },
+          { type: "mouseenter", target: '<div id="div4">', buttons: 1, button: 0 },
+          { type: "mouseover",  target: '<div id="div5">', buttons: 1, button: 0 },
+          { type: "mouseenter", target: '<div id="div5">', buttons: 1, button: 0 },
+        ]),
+        "Mouse boundary events should have the state of primary button pressed"
+      );
+    });
+    assert_equals(
+      stringifyEvents(pointerEvents),
+      stringifyEvents([
+        { type: "pointerout",   target: '<div id="div0">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerleave", target: '<div id="div0">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerover",  target: '<div id="div1">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerenter", target: '<div id="div1">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerout",   target: '<div id="div1">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerleave", target: '<div id="div1">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerover",  target: '<div id="div2">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerenter", target: '<div id="div2">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerout",   target: '<div id="div2">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerleave", target: '<div id="div2">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerover",  target: '<div id="div3">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerenter", target: '<div id="div3">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerover",  target: '<div id="div4">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerenter", target: '<div id="div4">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerover",  target: '<div id="div5">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+        { type: "pointerenter", target: '<div id="div5">', buttons: 1, button: -1, pointerId, pointerType: "mouse" },
+      ]),
+      "Pointer boundary events should have the state of primary button pressed"
+    );
+  });
+}, {once: true});
+</script>
+</head>
+<body></body>
+</html>
diff --git a/tests/wpt/tests/resource-timing/initiator-type/resources/dummy.svg b/tests/wpt/tests/resource-timing/initiator-type/resources/dummy.svg
new file mode 100644
index 00000000000..37d6c7440ff
--- /dev/null
+++ b/tests/wpt/tests/resource-timing/initiator-type/resources/dummy.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <symbol id="icon" viewBox="0 0 100 100">
+    <circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
+  </symbol>
+</svg>
+
diff --git a/tests/wpt/tests/resource-timing/initiator-type/svg.html b/tests/wpt/tests/resource-timing/initiator-type/svg.html
index d92f5935d80..f33a12ef481 100644
--- a/tests/wpt/tests/resource-timing/initiator-type/svg.html
+++ b/tests/wpt/tests/resource-timing/initiator-type/svg.html
@@ -16,8 +16,12 @@
   xmlns:xlink="http://www.w3.org/1999/xlink">
   <image href="/resource-timing/resources/blue.png" height="200" width="200"/>
 </svg>
+<svg style="display: none;">
+    <use href="/resource-timing/resources/dummy.svg"></use>
+</svg>
 <script>
   initiator_type_test("blue.png", "image", "<image> in an <svg>");
+  initiator_type_test("dummy.svg", "other", "<use> in an <svg>");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/resource-timing/resources/test-initiator.js b/tests/wpt/tests/resource-timing/resources/test-initiator.js
index 7c354243260..c6ad50a9db9 100644
--- a/tests/wpt/tests/resource-timing/resources/test-initiator.js
+++ b/tests/wpt/tests/resource-timing/resources/test-initiator.js
@@ -1,40 +1,25 @@
-function testResourceInitiatorUrl(resourceName, expectedUrl) {
-    return new Promise(( resolve , reject) => {
-      const observer = new PerformanceObserver(list => {
-        const entries = list.getEntriesByType('resource');
-        for (const entry of entries) {
-          if (entry.name.endsWith(resourceName)) {
-            observer.disconnect();
-            try {
-              assert_equals(entry.initiatorUrl, expectedUrl, `Test ${resourceName} initiatorUrl`);
-              resolve();
-            } catch(error) {
-              reject(error);
-            }
-          }
-        }
-        reject(resourceName + " not found");
-      });
-      observer.observe({type: "resource", buffered: true});
-    });
+if (observe_entry === undefined) {
+  throw new Error("You must include resource-timing/resources/observe-entry.js "
+    + "before including this script.");
 }
 
-// TODO(guohuideng@microsoft.com): The utility function below is used by some tests designed
-// for resource IDs. Either delete them or modify them when the resource-initiator feature
-// is complete.
-function testResourceInitiator(resourceName, expectedInitiator) {
-    return new Promise(resolve => {
-      const observer = new PerformanceObserver(list => {
-        const entries = list.getEntriesByType('resource');
-        for (const entry of entries) {
-          if (entry.name.endsWith(resourceName)) {
-            observer.disconnect();
-            assert_equals(entry.initiator, expectedInitiator, `Test ${resourceName} initiator`);
-            resolve();
-            return;
-          }
-        }
-      });
-      observer.observe({entryTypes: ['resource']});
-    });
-}
+// Asserts that, for the given name, there is/will-be a
+// PerformanceResourceTiming entry that has the given 'initiatorUrl'. The test
+// is labeled according to the given descriptor.
+const initiator_url_test = (resourceName, expectedUrl, descriptor) => {
+  promise_test(async () => {
+    const entry = await observe_entry(resourceName);
+    assert_equals(entry.initiatorUrl, expectedUrl);
+  }, `The initiator Url for ${descriptor} must be '${expectedUrl}'`);
+};
+
+const initiator_url_doc_write_test = (write_to_doc,
+  resourceName, expectedUrl, descriptor) => {
+  promise_test(async () => {
+    document.open();
+    document.write(write_to_doc);
+    document.close();
+    const entry = await observe_entry(resourceName);
+    assert_equals(entry.initiatorUrl, expectedUrl);
+  }, `The initiator Url for ${descriptor} must be '${expectedUrl}'`);
+};
diff --git a/tests/wpt/tests/resource-timing/tentative/document-initiated.html b/tests/wpt/tests/resource-timing/tentative/document-initiated.html
deleted file mode 100644
index 2f7abbffca2..00000000000
--- a/tests/wpt/tests/resource-timing/tentative/document-initiated.html
+++ /dev/null
@@ -1,113 +0,0 @@
-<!DOCTYPE html>
-<head>
-  <script src="/resources/testharness.js"></script>
-  <script src="/resources/testharnessreport.js"></script>
-  <script src="../resources/test-initiator.js"></script>
-  <script src="/common/get-host-info.sub.js"></script>
-
-  <!-- Empty Blocking Script -->
-  <script src="../resources/empty.js?blocking"></script>
-  <!-- Empty Preloaded Script -->
-  <link rel="preload" href="../resources/display_paragraph.js" as="script" />
-  <!--  Loading arbitrary Empty Blocking Async Script -->
-  <script async src="../resources/empty.js?async"></script>
-  <!-- Loading arbitrary Empty Deferred Script -->
-  <script defer src="../resources/empty.js?deferred"></script>
-  <!-- Loading arbitrary Empty Module Script -->
-  <script type="module" src="../resources/empty.js?module"></script>
-  <!-- Empty Stylesheet -->
-  <link rel="stylesheet" href="../resources/empty_style.css?link" />
-  <script src="../resources/display_paragraph.js"></script>
-  <!-- Inline Styles -->
-  <style>
-    body {
-      background-image: url("/images/blue.png?inline-style");
-      font-family: remoteFont, sans-serif;
-    }
-    @font-face {
-      font-family: remoteFont;
-      /* This query parameter ensures that the Ahem.ttf is not retrieved from the cache. */
-      src: url("/fonts/Ahem.ttf?initiator-html");
-    }
-  </style>
-</head>
-<body>
-  <!-- Loading an arbitrary Image using <img> tag -->
-  <img
-    src="/images/blue.png?using-Img-tag"
-    alt="Sample Image for testing initiator Attribute"
-  />
-
-  <iframe src="../resources/green.html"></iframe>
-
-  <script>
-    display_paragraph();
-
-    function waitForLoad(obj) {
-      return new Promise(resolve => {
-        obj.addEventListener("load", resolve, { once: true });
-      });
-    }
-
-    // Load arbitrary stylesheet with inline script
-    const link = document.createElement("link");
-    link.rel = "stylesheet";
-    link.href = "../resources/empty_style.css?inline-script";
-    document.head.appendChild(link);
-    // Load arbitrary image with inline script
-    const img = document.createElement("img");
-    img.src = "/images/blue.png?inline-script";
-    document.body.appendChild(img);
-
-    const host_info = get_host_info();
-    const expectedInitiatorUrl = host_info["ORIGIN"] + "/resource-timing/tentative/document-initiated.html";
-
-    // Testing Initiator of all the resources loaded
-    promise_test(async (t) => {
-      await waitForLoad(link);
-      await waitForLoad(img);
-
-      const resources = [
-        "empty.js?blocking",
-        "display_paragraph.js",
-        "empty.js?async",
-        "empty.js?deferred",
-        "empty.js?module",
-        "empty_style.css?link",
-        "blue.png?inline-style",
-        "Ahem.ttf?initiator-html",
-        "blue.png?using-Img-tag",
-        /*        "green.html",
-        TODO(guohuideng@microsoft.com): report initiator for iframe element.
-        */
-        "empty_style.css?inline-script",
-        "blue.png?inline-script",
-      ];
-      for (const resource of resources) {
-        await testResourceInitiatorUrl(resource, expectedInitiatorUrl);
-      }
-    }, "initiatorUrl by main html file");
-
-    // Finally, test with the case document.write().
-    promise_test(async (t) => {
-      document.open();
-      document.write('<img id="img_written" src="/images/blue.png?inline-script-doc-write">');
-      document.close();
-      await waitForLoad(document.getElementById("img_written"));
-      await testResourceInitiatorUrl("blue.png?inline-script-doc-write", expectedInitiatorUrl);
-
-      document.open();
-      document.write('<link id="css_written" rel="stylesheet" href="../resources/empty_style.css?inline-script-doc-write">');
-      document.close();
-      await waitForLoad(document.getElementById("css_written"));
-      await testResourceInitiatorUrl("empty_style.css?inline-script-doc-write", expectedInitiatorUrl);
-
-      document.open();
-      document.write('<script id="script_written" src="../resources/empty.js?doc-write"><\/script>');
-      document.close();
-      await waitForLoad(document.getElementById("script_written"));
-      await testResourceInitiatorUrl("empty.js?doc-write", expectedInitiatorUrl);
-    }, "initiatorUrl for resource by document.write()");
-
-  </script>
-</body>
diff --git a/tests/wpt/tests/resource-timing/tentative/initiator-url/document-initiated.html b/tests/wpt/tests/resource-timing/tentative/initiator-url/document-initiated.html
new file mode 100644
index 00000000000..6b192270697
--- /dev/null
+++ b/tests/wpt/tests/resource-timing/tentative/initiator-url/document-initiated.html
@@ -0,0 +1,95 @@
+<!DOCTYPE html>
+<head>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resource-timing/resources/observe-entry.js"></script>
+  <script src="../../resources/test-initiator.js"></script>
+  <script src="/common/get-host-info.sub.js"></script>
+
+  <!-- Empty Blocking Script -->
+  <script src="../../resources/empty.js?blocking"></script>
+  <!-- Empty Preloaded Script -->
+  <link rel="preload" href="../../resources/display_paragraph.js" as="script" />
+  <!--  Loading arbitrary Empty Blocking Async Script -->
+  <script async src="../../resources/empty.js?async"></script>
+  <!-- Loading arbitrary Empty Deferred Script -->
+  <script defer src="../../resources/empty.js?deferred"></script>
+  <!-- Loading arbitrary Empty Module Script -->
+  <script type="module" src="../../resources/empty.js?module"></script>
+  <!-- Empty Stylesheet -->
+  <link rel="stylesheet" href="../../resources/empty_style.css?link" />
+  <script src="../../resources/display_paragraph.js"></script>
+  <!-- Inline Styles -->
+  <style>
+    body {
+      background-image: url("/images/blue.png?inline-style");
+      font-family: remoteFont, sans-serif;
+    }
+    @font-face {
+      font-family: remoteFont;
+      /* This query parameter ensures that the Ahem.ttf is not retrieved from the cache. */
+      src: url("/fonts/Ahem.ttf?initiator-html");
+    }
+  </style>
+</head>
+<body>
+  <!-- Loading an arbitrary Image using <img> tag -->
+  <img
+    src="/images/blue.png?using-Img-tag"
+    alt="Sample Image for testing initiator Attribute"
+  />
+
+  <iframe src="../../resources/green.html"></iframe>
+
+  <script>
+    display_paragraph();
+
+    // Load arbitrary stylesheet with inline script
+    const link = document.createElement("link");
+    link.rel = "stylesheet";
+    link.href = "../../resources/empty_style.css?inline-script";
+    document.head.appendChild(link);
+    // Load arbitrary image with inline script
+    const img = document.createElement("img");
+    img.src = "/images/blue.png?inline-script";
+    document.body.appendChild(img);
+
+    const host_info = get_host_info();
+    const expectedInitiatorUrl = host_info["ORIGIN"] +
+      "/resource-timing/tentative/initiator-url/document-initiated.html";
+
+    const resources = [
+      "empty.js?blocking",
+      "display_paragraph.js",
+      "empty.js?async",
+      "empty.js?deferred",
+      "empty.js?module",
+      "empty_style.css?link",
+      "blue.png?inline-style",
+      "Ahem.ttf?initiator-html",
+      "blue.png?using-Img-tag",
+        /*        "green.html",
+        TODO(guohuideng@microsoft.com): report initiator for iframe element.
+        */
+      "empty_style.css?inline-script",
+      "blue.png?inline-script",
+    ];
+    for (const resource of resources) {
+      initiator_url_test(resource, expectedInitiatorUrl, resource+" initiatorUrl from document-initiated");
+    }
+
+    write_to_doc = '<img id="img_written" src="/images/blue.png?inline-script-doc-write">';
+    resource = "blue.png?inline-script-doc-write";
+    initiator_url_doc_write_test(write_to_doc, resource, expectedInitiatorUrl,
+      resource+" initiatorUrl from document-initiated");
+
+    write_to_doc = '<link id="css_written" rel="stylesheet" href="../../resources/empty_style.css?inline-script-doc-write">';
+    resource = "empty_style.css?inline-script-doc-write";
+    initiator_url_doc_write_test(write_to_doc, resource, expectedInitiatorUrl, resource+" initiatorUrl from document-initiated");
+
+    write_to_doc = '<script id="script_written" src="../../resources/empty.js?doc-write"><\/script>';
+    resource = "empty.js?doc-write";
+    initiator_url_doc_write_test(write_to_doc, resource, expectedInitiatorUrl, resource+" initiatorUrl from document-initiated");
+
+  </script>
+</body>
diff --git a/tests/wpt/tests/resources/webidl2/lib/VERSION.md b/tests/wpt/tests/resources/webidl2/lib/VERSION.md
index 5a3726c6c00..2614a8d194b 100644
--- a/tests/wpt/tests/resources/webidl2/lib/VERSION.md
+++ b/tests/wpt/tests/resources/webidl2/lib/VERSION.md
@@ -1 +1 @@
-Currently using webidl2.js@6889aee6fc7d65915ab1267825248157dbc50486.
+Currently using webidl2.js@e6d8ab852ec4e76596f6e308eb7f2efc8b613bfd.
diff --git a/tests/wpt/tests/resources/webidl2/lib/webidl2.js b/tests/wpt/tests/resources/webidl2/lib/webidl2.js
index 7161def899c..bae0b204759 100644
--- a/tests/wpt/tests/resources/webidl2/lib/webidl2.js
+++ b/tests/wpt/tests/resources/webidl2/lib/webidl2.js
@@ -17,7 +17,7 @@ return /******/ (() => { // webpackBootstrap
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "parse": () => (/* binding */ parse)
+/* harmony export */   parse: () => (/* binding */ parse)
 /* harmony export */ });
 /* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(2);
 /* harmony import */ var _productions_enum_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(15);
@@ -46,11 +46,22 @@ __webpack_require__.r(__webpack_exports__);
 
 
 
+/** @typedef {'callbackInterface'|'dictionary'|'interface'|'mixin'|'namespace'} ExtendableInterfaces */
+/** @typedef {{ extMembers?: import("./productions/container.js").AllowedMember[]}} Extension */
+/** @typedef {Partial<Record<ExtendableInterfaces, Extension>>} Extensions */
+
+/**
+ * Parser options.
+ * @typedef {Object} ParserOptions
+ * @property {string} [sourceName]
+ * @property {boolean} [concrete]
+ * @property {Function[]} [productions]
+ * @property {Extensions} [extensions]
+ */
+
 /**
  * @param {Tokeniser} tokeniser
- * @param {object} options
- * @param {boolean} [options.concrete]
- * @param {Function[]} [options.productions]
+ * @param {ParserOptions} options
  */
 function parseByTokens(tokeniser, options) {
   const source = tokeniser.source;
@@ -67,7 +78,9 @@ function parseByTokens(tokeniser, options) {
     const callback = consume("callback");
     if (!callback) return;
     if (tokeniser.probe("interface")) {
-      return _productions_callback_interface_js__WEBPACK_IMPORTED_MODULE_10__.CallbackInterface.parse(tokeniser, callback);
+      return _productions_callback_interface_js__WEBPACK_IMPORTED_MODULE_10__.CallbackInterface.parse(tokeniser, callback, {
+        ...options?.extensions?.callbackInterface,
+      });
     }
     return _productions_callback_js__WEBPACK_IMPORTED_MODULE_5__.CallbackFunction.parse(tokeniser, callback);
   }
@@ -75,20 +88,32 @@ function parseByTokens(tokeniser, options) {
   function interface_(opts) {
     const base = consume("interface");
     if (!base) return;
-    const ret =
-      _productions_mixin_js__WEBPACK_IMPORTED_MODULE_7__.Mixin.parse(tokeniser, base, opts) ||
-      _productions_interface_js__WEBPACK_IMPORTED_MODULE_6__.Interface.parse(tokeniser, base, opts) ||
-      error("Interface has no proper body");
-    return ret;
+    return (
+      _productions_mixin_js__WEBPACK_IMPORTED_MODULE_7__.Mixin.parse(tokeniser, base, {
+        ...opts,
+        ...options?.extensions?.mixin,
+      }) ||
+      _productions_interface_js__WEBPACK_IMPORTED_MODULE_6__.Interface.parse(tokeniser, base, {
+        ...opts,
+        ...options?.extensions?.interface,
+      }) ||
+      error("Interface has no proper body")
+    );
   }
 
   function partial() {
     const partial = consume("partial");
     if (!partial) return;
     return (
-      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser, { partial }) ||
+      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser, {
+        partial,
+        ...options?.extensions?.dictionary,
+      }) ||
       interface_({ partial }) ||
-      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser, { partial }) ||
+      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser, {
+        partial,
+        ...options?.extensions?.namespace,
+      }) ||
       error("Partial doesn't apply to anything")
     );
   }
@@ -107,11 +132,11 @@ function parseByTokens(tokeniser, options) {
       callback() ||
       interface_() ||
       partial() ||
-      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser) ||
+      _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__.Dictionary.parse(tokeniser, options?.extensions?.dictionary) ||
       _productions_enum_js__WEBPACK_IMPORTED_MODULE_1__.Enum.parse(tokeniser) ||
       _productions_typedef_js__WEBPACK_IMPORTED_MODULE_4__.Typedef.parse(tokeniser) ||
       _productions_includes_js__WEBPACK_IMPORTED_MODULE_2__.Includes.parse(tokeniser) ||
-      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser)
+      _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__.Namespace.parse(tokeniser, options?.extensions?.namespace)
     );
   }
 
@@ -134,6 +159,7 @@ function parseByTokens(tokeniser, options) {
     }
     return defs;
   }
+
   const res = definitions();
   if (tokeniser.position < source.length) error("Unrecognised tokens");
   return res;
@@ -141,11 +167,7 @@ function parseByTokens(tokeniser, options) {
 
 /**
  * @param {string} str
- * @param {object} [options]
- * @param {*} [options.sourceName]
- * @param {boolean} [options.concrete]
- * @param {Function[]} [options.productions]
- * @return {import("./productions/base.js").Base[]}
+ * @param {ParserOptions} [options]
  */
 function parse(str, options = {}) {
   const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__.Tokeniser(str);
@@ -163,11 +185,11 @@ function parse(str, options = {}) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Tokeniser": () => (/* binding */ Tokeniser),
-/* harmony export */   "WebIDLParseError": () => (/* binding */ WebIDLParseError),
-/* harmony export */   "argumentNameKeywords": () => (/* binding */ argumentNameKeywords),
-/* harmony export */   "stringTypes": () => (/* binding */ stringTypes),
-/* harmony export */   "typeNameKeywords": () => (/* binding */ typeNameKeywords)
+/* harmony export */   Tokeniser: () => (/* binding */ Tokeniser),
+/* harmony export */   WebIDLParseError: () => (/* binding */ WebIDLParseError),
+/* harmony export */   argumentNameKeywords: () => (/* binding */ argumentNameKeywords),
+/* harmony export */   stringTypes: () => (/* binding */ stringTypes),
+/* harmony export */   typeNameKeywords: () => (/* binding */ typeNameKeywords)
 /* harmony export */ });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
 /* harmony import */ var _productions_helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -191,6 +213,7 @@ const tokenRe = {
 
 const typeNameKeywords = [
   "ArrayBuffer",
+  "SharedArrayBuffer",
   "DataView",
   "Int8Array",
   "Int16Array",
@@ -201,6 +224,7 @@ const typeNameKeywords = [
   "Uint8ClampedArray",
   "BigInt64Array",
   "BigUint64Array",
+  "Float16Array",
   "Float32Array",
   "Float64Array",
   "any",
@@ -243,6 +267,8 @@ const nonRegexTerminals = [
   "NaN",
   "ObservableArray",
   "Promise",
+  "async_iterable",
+  "async_sequence",
   "bigint",
   "boolean",
   "byte",
@@ -327,10 +353,10 @@ function tokenise(str) {
         if (result !== -1) {
           if (reserved.includes(token.value)) {
             const message = `${(0,_productions_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(
-              token.value
+              token.value,
             )} is a reserved identifier and must not be used.`;
             throw new WebIDLParseError(
-              (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(tokens, lastIndex, null, message)
+              (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(tokens, lastIndex, null, message),
             );
           } else if (nonRegexTerminals.includes(token.value)) {
             token.type = "inline";
@@ -414,7 +440,7 @@ class Tokeniser {
    */
   error(message) {
     throw new WebIDLParseError(
-      (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(this.source, this.position, this.current, message)
+      (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.syntaxError)(this.source, this.position, this.current, message),
     );
   }
 
@@ -522,8 +548,8 @@ class WebIDLParseError extends Error {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "syntaxError": () => (/* binding */ syntaxError),
-/* harmony export */   "validationError": () => (/* binding */ validationError)
+/* harmony export */   syntaxError: () => (/* binding */ syntaxError),
+/* harmony export */   validationError: () => (/* binding */ validationError)
 /* harmony export */ });
 /**
  * @param {string} text
@@ -572,7 +598,7 @@ function error(
   current,
   message,
   kind,
-  { level = "error", autofix, ruleName } = {}
+  { level = "error", autofix, ruleName } = {},
 ) {
   /**
    * @param {number} count
@@ -606,11 +632,11 @@ function error(
     source[position].type !== "eof"
       ? source[position].line
       : source.length > 1
-      ? source[position - 1].line
-      : 1;
+        ? source[position - 1].line
+        : 1;
 
   const precedingLastLine = lastLine(
-    tokensToText(sliceTokens(-maxTokens), { precedes: true })
+    tokensToText(sliceTokens(-maxTokens), { precedes: true }),
   );
 
   const subsequentTokens = sliceTokens(maxTokens);
@@ -625,7 +651,7 @@ function error(
   const grammaticalContext =
     current && current.name
       ? `, ${contextType} \`${current.partial ? "partial " : ""}${contextAsText(
-          current
+          current,
         )}\``
       : "";
   const context = `${kind} error at line ${line}${inSourceName}${grammaticalContext}:\n${sourceContext}`;
@@ -659,7 +685,7 @@ function validationError(
   current,
   ruleName,
   message,
-  options = {}
+  options = {},
 ) {
   options.ruleName = ruleName;
   return error(
@@ -668,7 +694,7 @@ function validationError(
     current,
     message,
     "Validation",
-    options
+    options,
   );
 }
 
@@ -679,21 +705,21 @@ function validationError(
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "argument_list": () => (/* binding */ argument_list),
-/* harmony export */   "autoParenter": () => (/* binding */ autoParenter),
-/* harmony export */   "autofixAddExposedWindow": () => (/* binding */ autofixAddExposedWindow),
-/* harmony export */   "const_data": () => (/* binding */ const_data),
-/* harmony export */   "const_value": () => (/* binding */ const_value),
-/* harmony export */   "findLastIndex": () => (/* binding */ findLastIndex),
-/* harmony export */   "getFirstToken": () => (/* binding */ getFirstToken),
-/* harmony export */   "getLastIndentation": () => (/* binding */ getLastIndentation),
-/* harmony export */   "getMemberIndentation": () => (/* binding */ getMemberIndentation),
-/* harmony export */   "list": () => (/* binding */ list),
-/* harmony export */   "primitive_type": () => (/* binding */ primitive_type),
-/* harmony export */   "return_type": () => (/* binding */ return_type),
-/* harmony export */   "stringifier": () => (/* binding */ stringifier),
-/* harmony export */   "type_with_extended_attributes": () => (/* binding */ type_with_extended_attributes),
-/* harmony export */   "unescape": () => (/* binding */ unescape)
+/* harmony export */   argument_list: () => (/* binding */ argument_list),
+/* harmony export */   autoParenter: () => (/* binding */ autoParenter),
+/* harmony export */   autofixAddExposedWindow: () => (/* binding */ autofixAddExposedWindow),
+/* harmony export */   const_data: () => (/* binding */ const_data),
+/* harmony export */   const_value: () => (/* binding */ const_value),
+/* harmony export */   findLastIndex: () => (/* binding */ findLastIndex),
+/* harmony export */   getFirstToken: () => (/* binding */ getFirstToken),
+/* harmony export */   getLastIndentation: () => (/* binding */ getLastIndentation),
+/* harmony export */   getMemberIndentation: () => (/* binding */ getMemberIndentation),
+/* harmony export */   list: () => (/* binding */ list),
+/* harmony export */   primitive_type: () => (/* binding */ primitive_type),
+/* harmony export */   return_type: () => (/* binding */ return_type),
+/* harmony export */   stringifier: () => (/* binding */ stringifier),
+/* harmony export */   type_with_extended_attributes: () => (/* binding */ type_with_extended_attributes),
+/* harmony export */   unescape: () => (/* binding */ unescape)
 /* harmony export */ });
 /* harmony import */ var _type_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(5);
 /* harmony import */ var _argument_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(11);
@@ -816,7 +842,7 @@ function primitive_type(tokeniser) {
     "boolean",
     "byte",
     "octet",
-    "undefined"
+    "undefined",
   );
   if (base) {
     return new _type_js__WEBPACK_IMPORTED_MODULE_0__.Type({ source, tokens: { base } });
@@ -917,7 +943,7 @@ function autofixAddExposedWindow(def) {
       def.extAttrs.unshift(exposed);
     } else {
       autoParenter(def).extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(
-        new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__.Tokeniser("[Exposed=Window]")
+        new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__.Tokeniser("[Exposed=Window]"),
       );
       const trivia = def.tokens.base.trivia;
       def.extAttrs.tokens.open.trivia = trivia;
@@ -1010,7 +1036,7 @@ function autoParenter(data, parent) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Type": () => (/* binding */ Type)
+/* harmony export */   Type: () => (/* binding */ Type)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -1034,14 +1060,15 @@ function generic_type(tokeniser, typeName) {
     "FrozenArray",
     "ObservableArray",
     "Promise",
+    "async_sequence",
     "sequence",
-    "record"
+    "record",
   );
   if (!base) {
     return;
   }
   const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
-    new Type({ source: tokeniser.source, tokens: { base } })
+    new Type({ source: tokeniser.source, tokens: { base } }),
   );
   ret.tokens.open =
     tokeniser.consume("<") ||
@@ -1056,6 +1083,7 @@ function generic_type(tokeniser, typeName) {
       ret.subtype.push(subtype);
       break;
     }
+    case "async_sequence":
     case "sequence":
     case "FrozenArray":
     case "ObservableArray": {
@@ -1143,7 +1171,7 @@ function union_type(tokeniser, type) {
   ret.type = type || null;
   while (true) {
     const typ =
-      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser) ||
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser, type) ||
       tokeniser.error("No type after open parenthesis or 'or' in union type");
     if (typ.idlType === "any")
       tokeniser.error("Type `any` cannot be included in a union type");
@@ -1157,7 +1185,7 @@ function union_type(tokeniser, type) {
   }
   if (ret.idlType.length < 2) {
     tokeniser.error(
-      "At least two types are expected in a union type but found less"
+      "At least two types are expected in a union type but found less",
     );
   }
   tokens.close =
@@ -1208,6 +1236,26 @@ class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
   *validate(defs) {
     yield* this.extAttrs.validate(defs);
 
+    if (this.idlType === "BufferSource") {
+      // XXX: For now this is a hack. Consider moving parents' extAttrs into types as the spec says:
+      // https://webidl.spec.whatwg.org/#idl-annotated-types
+      for (const extAttrs of [this.extAttrs, this.parent?.extAttrs]) {
+        for (const extAttr of extAttrs) {
+          if (extAttr.name !== "AllowShared") {
+            continue;
+          }
+          const message = `\`[AllowShared] BufferSource\` is now replaced with AllowSharedBufferSource.`;
+          yield (0,_error_js__WEBPACK_IMPORTED_MODULE_3__.validationError)(
+            this.tokens.base,
+            this,
+            "migrate-allowshared",
+            message,
+            { autofix: replaceAllowShared(this, extAttr, extAttrs) },
+          );
+        }
+      }
+    }
+
     if (this.idlType === "void") {
       const message = `\`void\` is now replaced by \`undefined\`. Refer to the \
 [relevant GitHub issue](https://github.com/whatwg/webidl/issues/60) \
@@ -1225,8 +1273,8 @@ for more information.`;
     const target = this.union
       ? this
       : typedef && typedef.type === "typedef"
-      ? typedef.idlType
-      : undefined;
+        ? typedef.idlType
+        : undefined;
     if (target && this.nullable) {
       // do not allow any dictionary
       const { reference } = (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__.idlTypeIncludesDictionary)(target, defs) || {};
@@ -1237,7 +1285,7 @@ for more information.`;
           targetToken,
           this,
           "no-nullable-union-dict",
-          message
+          message,
         );
       }
     } else {
@@ -1274,7 +1322,7 @@ for more information.`;
             this.idlType
           ),
           context: this,
-        }
+        },
       );
       return w.ts.wrap([w.ts.trivia(firstToken.trivia), ref]);
     };
@@ -1287,6 +1335,23 @@ for more information.`;
   }
 }
 
+/**
+ * @param {Type} type
+ * @param {import("./extended-attributes.js").SimpleExtendedAttribute} extAttr
+ * @param {ExtendedAttributes} extAttrs
+ */
+function replaceAllowShared(type, extAttr, extAttrs) {
+  return () => {
+    const index = extAttrs.indexOf(extAttr);
+    extAttrs.splice(index, 1);
+    if (!extAttrs.length && type.tokens.base.trivia.match(/^\s$/)) {
+      type.tokens.base.trivia = ""; // (let's not remove comments)
+    }
+
+    type.tokens.base.value = "AllowSharedBufferSource";
+  };
+}
+
 /**
  * @param {Type} type
  */
@@ -1303,7 +1368,7 @@ function replaceVoid(type) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Base": () => (/* binding */ Base)
+/* harmony export */   Base: () => (/* binding */ Base)
 /* harmony export */ });
 class Base {
   /**
@@ -1344,14 +1409,17 @@ class Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "dictionaryIncludesRequiredField": () => (/* binding */ dictionaryIncludesRequiredField),
-/* harmony export */   "idlTypeIncludesDictionary": () => (/* binding */ idlTypeIncludesDictionary)
+/* harmony export */   dictionaryIncludesRequiredField: () => (/* binding */ dictionaryIncludesRequiredField),
+/* harmony export */   idlTypeIncludesDictionary: () => (/* binding */ idlTypeIncludesDictionary),
+/* harmony export */   idlTypeIncludesEnforceRange: () => (/* binding */ idlTypeIncludesEnforceRange)
 /* harmony export */ });
 /**
+ * @typedef {import("../validator.js").Definitions} Definitions
  * @typedef {import("../productions/dictionary.js").Dictionary} Dictionary
+ * @typedef {import("../../lib/productions/type").Type} Type
  *
- * @param {*} idlType
- * @param {import("../validator.js").Definitions} defs
+ * @param {Type} idlType
+ * @param {Definitions} defs
  * @param {object} [options]
  * @param {boolean} [options.useNullableInner] use when the input idlType is nullable and you want to use its inner type
  * @return {{ reference: *, dictionary: Dictionary }} the type reference that ultimately includes dictionary.
@@ -1359,7 +1427,7 @@ __webpack_require__.r(__webpack_exports__);
 function idlTypeIncludesDictionary(
   idlType,
   defs,
-  { useNullableInner } = {}
+  { useNullableInner } = {},
 ) {
   if (!idlType.union) {
     const def = defs.unique.get(idlType.idlType);
@@ -1405,8 +1473,8 @@ function idlTypeIncludesDictionary(
 }
 
 /**
- * @param {*} dict dictionary type
- * @param {import("../validator.js").Definitions} defs
+ * @param {Dictionary} dict dictionary type
+ * @param {Definitions} defs
  * @return {boolean}
  */
 function dictionaryIncludesRequiredField(dict, defs) {
@@ -1430,6 +1498,34 @@ function dictionaryIncludesRequiredField(dict, defs) {
   return result;
 }
 
+/**
+ * For now this only checks the most frequent cases:
+ * 1. direct inclusion of [EnforceRange]
+ * 2. typedef of that
+ *
+ * More complex cases with dictionaries and records are not covered yet.
+ *
+ * @param {Type} idlType
+ * @param {Definitions} defs
+ */
+function idlTypeIncludesEnforceRange(idlType, defs) {
+  if (idlType.union) {
+    // TODO: This should ideally be checked too
+    return false;
+  }
+
+  if (idlType.extAttrs.some((e) => e.name === "EnforceRange")) {
+    return true;
+  }
+
+  const def = defs.unique.get(idlType.idlType);
+  if (def?.type !== "typedef") {
+    return false;
+  }
+
+  return def.idlType.extAttrs.some((e) => e.name === "EnforceRange");
+}
+
 
 /***/ }),
 /* 8 */
@@ -1437,9 +1533,9 @@ function dictionaryIncludesRequiredField(dict, defs) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "ExtendedAttributeParameters": () => (/* binding */ ExtendedAttributeParameters),
-/* harmony export */   "ExtendedAttributes": () => (/* binding */ ExtendedAttributes),
-/* harmony export */   "SimpleExtendedAttribute": () => (/* binding */ SimpleExtendedAttribute)
+/* harmony export */   ExtendedAttributeParameters: () => (/* binding */ ExtendedAttributeParameters),
+/* harmony export */   ExtendedAttributes: () => (/* binding */ ExtendedAttributes),
+/* harmony export */   SimpleExtendedAttribute: () => (/* binding */ SimpleExtendedAttribute)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _array_base_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(9);
@@ -1494,7 +1590,7 @@ function extAttrListItems(tokeniser) {
     }
   }
   tokeniser.error(
-    `Expected identifiers, strings, decimals, or integers but none found`
+    `Expected identifiers, strings, decimals, or integers but none found`,
   );
 }
 
@@ -1505,7 +1601,7 @@ class ExtendedAttributeParameters extends _base_js__WEBPACK_IMPORTED_MODULE_0__.
   static parse(tokeniser) {
     const tokens = { assign: tokeniser.consume("=") };
     const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
-      new ExtendedAttributeParameters({ source: tokeniser.source, tokens })
+      new ExtendedAttributeParameters({ source: tokeniser.source, tokens }),
     );
     ret.list = [];
     if (tokens.assign) {
@@ -1603,8 +1699,8 @@ class SimpleExtendedAttribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base
     const value = this.params.rhsIsList
       ? list
       : this.params.tokens.secondaryName
-      ? (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.unescape)(tokens.secondaryName.value)
-      : null;
+        ? (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.unescape)(tokens.secondaryName.value)
+        : null;
     return { type, value };
   }
   get arguments() {
@@ -1627,7 +1723,7 @@ information.`;
         this,
         "no-nointerfaceobject",
         message,
-        { level: "warning" }
+        { level: "warning" },
       );
     } else if (renamedLegacies.has(name)) {
       const message = `\`[${name}]\` extended attribute is a legacy feature \
@@ -1652,7 +1748,7 @@ information.`;
         w.ts.wrap([
           w.ts.extendedAttributeReference(this.name),
           this.params.write(w),
-        ])
+        ]),
       ),
       w.token(this.tokens.separator),
     ]);
@@ -1687,12 +1783,12 @@ class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__.Arr
       ...(0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.list)(tokeniser, {
         parser: SimpleExtendedAttribute.parse,
         listName: "extended attribute",
-      })
+      }),
     );
     tokens.close =
       tokeniser.consume("]") ||
       tokeniser.error(
-        "Expected a closing token for the extended attribute list"
+        "Expected a closing token for the extended attribute list",
       );
     if (!ret.length) {
       tokeniser.unconsume(tokens.close.index);
@@ -1700,7 +1796,7 @@ class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__.Arr
     }
     if (tokeniser.probe("[")) {
       tokeniser.error(
-        "Illegal double extended attribute lists, consider merging them"
+        "Illegal double extended attribute lists, consider merging them",
       );
     }
     return ret;
@@ -1730,7 +1826,7 @@ class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__.Arr
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "ArrayBase": () => (/* binding */ ArrayBase)
+/* harmony export */   ArrayBase: () => (/* binding */ ArrayBase)
 /* harmony export */ });
 class ArrayBase extends Array {
   constructor({ source, tokens }) {
@@ -1750,8 +1846,8 @@ class ArrayBase extends Array {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Eof": () => (/* binding */ Eof),
-/* harmony export */   "WrappedToken": () => (/* binding */ WrappedToken)
+/* harmony export */   Eof: () => (/* binding */ Eof),
+/* harmony export */   WrappedToken: () => (/* binding */ WrappedToken)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -1775,6 +1871,10 @@ class WrappedToken extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
     };
   }
 
+  get type() {
+    return this.tokens.value.type;
+  }
+
   get value() {
     return (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.unescape)(this.tokens.value.value);
   }
@@ -1811,7 +1911,7 @@ class Eof extends WrappedToken {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Argument": () => (/* binding */ Argument)
+/* harmony export */   Argument: () => (/* binding */ Argument)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(12);
@@ -1837,7 +1937,7 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
     /** @type {Base["tokens"]} */
     const tokens = {};
     const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
-      new Argument({ source: tokeniser.source, tokens })
+      new Argument({ source: tokeniser.source, tokens }),
     );
     ret.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__.ExtendedAttributes.parse(tokeniser);
     tokens.optional = tokeniser.consume("optional");
@@ -1887,7 +1987,7 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
           this.tokens.name,
           this,
           "no-nullable-dict-arg",
-          message
+          message,
         );
       } else if (!this.optional) {
         if (
@@ -1903,7 +2003,7 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
             message,
             {
               autofix: autofixDictionaryArgumentOptionality(this),
-            }
+            },
           );
         }
       } else if (!this.default) {
@@ -1915,7 +2015,7 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
           message,
           {
             autofix: autofixOptionalDictionaryDefaultValue(this),
-          }
+          },
         );
       }
     }
@@ -1977,7 +2077,7 @@ function autofixOptionalDictionaryDefaultValue(arg) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Default": () => (/* binding */ Default)
+/* harmony export */   Default: () => (/* binding */ Default)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -2049,7 +2149,7 @@ class Default extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Operation": () => (/* binding */ Operation)
+/* harmony export */   Operation: () => (/* binding */ Operation)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -2060,17 +2160,15 @@ __webpack_require__.r(__webpack_exports__);
 
 class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
   /**
-   * @typedef {import("../tokeniser.js").Token} Token
-   *
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
    * @param {object} [options]
-   * @param {Token} [options.special]
-   * @param {Token} [options.regular]
+   * @param {import("../tokeniser.js").Token} [options.special]
+   * @param {import("../tokeniser.js").Token} [options.regular]
    */
   static parse(tokeniser, { special, regular } = {}) {
     const tokens = { special };
     const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
-      new Operation({ source: tokeniser.source, tokens })
+      new Operation({ source: tokeniser.source, tokens }),
     );
     if (special && special.value === "stringifier") {
       tokens.termination = tokeniser.consume(";");
@@ -2121,6 +2219,15 @@ class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
       yield (0,_error_js__WEBPACK_IMPORTED_MODULE_2__.validationError)(this.tokens.open, this, "incomplete-op", message);
     }
     if (this.idlType) {
+      if (this.idlType.generic === "async_sequence") {
+        const message = `async_sequence types cannot be returned by an operation.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_2__.validationError)(
+          this.idlType.tokens.base,
+          this,
+          "async-sequence-idl-to-js",
+          message,
+        );
+      }
       yield* this.idlType.validate(defs);
     }
     for (const argument of this.arguments) {
@@ -2149,7 +2256,7 @@ class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         ...body,
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent }
+      { data: this, parent },
     );
   }
 }
@@ -2161,7 +2268,7 @@ class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Attribute": () => (/* binding */ Attribute)
+/* harmony export */   Attribute: () => (/* binding */ Attribute)
 /* harmony export */ });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
 /* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(7);
@@ -2182,12 +2289,12 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
    */
   static parse(
     tokeniser,
-    { special, noInherit = false, readonly = false } = {}
+    { special, noInherit = false, readonly = false } = {},
   ) {
     const start_position = tokeniser.position;
     const tokens = { special };
     const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_3__.autoParenter)(
-      new Attribute({ source: tokeniser.source, tokens })
+      new Attribute({ source: tokeniser.source, tokens }),
     );
     if (!special && !noInherit) {
       tokens.special = tokeniser.consume("inherit");
@@ -2237,32 +2344,34 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
     yield* this.extAttrs.validate(defs);
     yield* this.idlType.validate(defs);
 
-    switch (this.idlType.generic) {
-      case "sequence":
-      case "record": {
-        const message = `Attributes cannot accept ${this.idlType.generic} types.`;
-        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
-          this.tokens.name,
-          this,
-          "attr-invalid-type",
-          message
-        );
-        break;
+    if (
+      ["async_sequence", "sequence", "record"].includes(this.idlType.generic)
+    ) {
+      const message = `Attributes cannot accept ${this.idlType.generic} types.`;
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
+        this.tokens.name,
+        this,
+        "attr-invalid-type",
+        message,
+      );
+    }
+
+    {
+      const { reference } = (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__.idlTypeIncludesDictionary)(this.idlType, defs) || {};
+      if (reference) {
+        const targetToken = (this.idlType.union ? reference : this.idlType)
+          .tokens.base;
+        const message = "Attributes cannot accept dictionary types.";
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(targetToken, this, "attr-invalid-type", message);
       }
-      default: {
-        const { reference } =
-          (0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__.idlTypeIncludesDictionary)(this.idlType, defs) || {};
-        if (reference) {
-          const targetToken = (this.idlType.union ? reference : this.idlType)
-            .tokens.base;
-          const message = "Attributes cannot accept dictionary types.";
-          yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
-            targetToken,
-            this,
-            "attr-invalid-type",
-            message
-          );
-        }
+    }
+
+    if (this.readonly) {
+      if ((0,_validators_helpers_js__WEBPACK_IMPORTED_MODULE_1__.idlTypeIncludesEnforceRange)(this.idlType, defs)) {
+        const targetToken = this.idlType.tokens.base;
+        const message =
+          "Readonly attributes cannot accept [EnforceRange] extended attribute.";
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(targetToken, this, "attr-invalid-type", message);
       }
     }
   }
@@ -2280,7 +2389,7 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
         w.name_token(this.tokens.name, { data: this, parent }),
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent }
+      { data: this, parent },
     );
   }
 }
@@ -2292,8 +2401,8 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Enum": () => (/* binding */ Enum),
-/* harmony export */   "EnumValue": () => (/* binding */ EnumValue)
+/* harmony export */   Enum: () => (/* binding */ Enum),
+/* harmony export */   EnumValue: () => (/* binding */ EnumValue)
 /* harmony export */ });
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(4);
 /* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(10);
@@ -2327,7 +2436,7 @@ class EnumValue extends _token_js__WEBPACK_IMPORTED_MODULE_1__.WrappedToken {
       w.ts.trivia(this.tokens.value.trivia),
       w.ts.definition(
         w.ts.wrap(['"', w.ts.name(this.value, { data: this, parent }), '"']),
-        { data: this, parent }
+        { data: this, parent },
       ),
       w.token(this.tokens.separator),
     ]);
@@ -2388,7 +2497,7 @@ class Enum extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
         w.token(this.tokens.close),
         w.token(this.tokens.termination),
       ]),
-      { data: this }
+      { data: this },
     );
   }
 }
@@ -2400,7 +2509,7 @@ class Enum extends _base_js__WEBPACK_IMPORTED_MODULE_2__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Includes": () => (/* binding */ Includes)
+/* harmony export */   Includes: () => (/* binding */ Includes)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -2451,7 +2560,7 @@ class Includes extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.reference_token(this.tokens.mixin, this),
         w.token(this.tokens.termination),
       ]),
-      { data: this }
+      { data: this },
     );
   }
 }
@@ -2463,7 +2572,7 @@ class Includes extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Typedef": () => (/* binding */ Typedef)
+/* harmony export */   Typedef: () => (/* binding */ Typedef)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -2516,7 +2625,7 @@ class Typedef extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.name_token(this.tokens.name, { data: this }),
         w.token(this.tokens.termination),
       ]),
-      { data: this }
+      { data: this },
     );
   }
 }
@@ -2528,10 +2637,12 @@ class Typedef extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "CallbackFunction": () => (/* binding */ CallbackFunction)
+/* harmony export */   CallbackFunction: () => (/* binding */ CallbackFunction)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(3);
+
 
 
 
@@ -2542,7 +2653,7 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
   static parse(tokeniser, base) {
     const tokens = { base };
     const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
-      new CallbackFunction({ source: tokeniser.source, tokens })
+      new CallbackFunction({ source: tokeniser.source, tokens }),
     );
     tokens.name =
       tokeniser.consumeKind("identifier") ||
@@ -2573,6 +2684,18 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
   *validate(defs) {
     yield* this.extAttrs.validate(defs);
+    for (const arg of this.arguments) {
+      yield* arg.validate(defs);
+      if (arg.idlType.generic === "async_sequence") {
+        const message = `async_sequence types cannot be returned as a callback argument.`;
+        yield (0,_error_js__WEBPACK_IMPORTED_MODULE_2__.validationError)(
+          arg.tokens.name,
+          arg,
+          "async-sequence-idl-to-js",
+          message,
+        );
+      }
+    }
     yield* this.idlType.validate(defs);
   }
 
@@ -2590,7 +2713,7 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.close),
         w.token(this.tokens.termination),
       ]),
-      { data: this }
+      { data: this },
     );
   }
 }
@@ -2602,7 +2725,7 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Interface": () => (/* binding */ Interface)
+/* harmony export */   Interface: () => (/* binding */ Interface)
 /* harmony export */ });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(14);
@@ -2643,8 +2766,12 @@ function static_member(tokeniser) {
 class Interface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {import("../tokeniser.js").Token} base
+   * @param {object} [options]
+   * @param {import("./container.js").AllowedMember[]} [options.extMembers]
+   * @param {import("../tokeniser.js").Token|null} [options.partial]
    */
-  static parse(tokeniser, base, { partial = null } = {}) {
+  static parse(tokeniser, base, { extMembers = [], partial = null } = {}) {
     const tokens = { partial, base };
     return _container_js__WEBPACK_IMPORTED_MODULE_0__.Container.parse(
       tokeniser,
@@ -2652,6 +2779,7 @@ class Interface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
       {
         inheritable: !partial,
         allowedMembers: [
+          ...extMembers,
           [_constant_js__WEBPACK_IMPORTED_MODULE_3__.Constant.parse],
           [_constructor_js__WEBPACK_IMPORTED_MODULE_8__.Constructor.parse],
           [static_member],
@@ -2660,7 +2788,7 @@ class Interface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
           [_attribute_js__WEBPACK_IMPORTED_MODULE_1__.Attribute.parse],
           [_operation_js__WEBPACK_IMPORTED_MODULE_2__.Operation.parse],
         ],
-      }
+      },
     );
   }
 
@@ -2686,11 +2814,11 @@ for more information.`;
         message,
         {
           autofix: (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.autofixAddExposedWindow)(this),
-        }
+        },
       );
     }
     const oldConstructors = this.extAttrs.filter(
-      (extAttr) => extAttr.name === "Constructor"
+      (extAttr) => extAttr.name === "Constructor",
     );
     for (const constructor of oldConstructors) {
       const message = `Constructors should now be represented as a \`constructor()\` operation on the interface \
@@ -2704,14 +2832,14 @@ for more information.`;
         message,
         {
           autofix: autofixConstructor(this, constructor),
-        }
+        },
       );
     }
 
     const isGlobal = this.extAttrs.some((extAttr) => extAttr.name === "Global");
     if (isGlobal) {
       const factoryFunctions = this.extAttrs.filter(
-        (extAttr) => extAttr.name === "LegacyFactoryFunction"
+        (extAttr) => extAttr.name === "LegacyFactoryFunction",
       );
       for (const named of factoryFunctions) {
         const message = `Interfaces marked as \`[Global]\` cannot have factory functions.`;
@@ -2719,12 +2847,12 @@ for more information.`;
           named.tokens.name,
           this,
           "no-constructible-global",
-          message
+          message,
         );
       }
 
       const constructors = this.members.filter(
-        (member) => member.type === "constructor"
+        (member) => member.type === "constructor",
       );
       for (const named of constructors) {
         const message = `Interfaces marked as \`[Global]\` cannot have constructors.`;
@@ -2732,7 +2860,7 @@ for more information.`;
           named.tokens.base,
           this,
           "no-constructible-global",
-          message
+          message,
         );
       }
     }
@@ -2748,13 +2876,13 @@ function autofixConstructor(interfaceDef, constructorExtAttr) {
   interfaceDef = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.autoParenter)(interfaceDef);
   return () => {
     const indentation = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getLastIndentation)(
-      interfaceDef.extAttrs.tokens.open.trivia
+      interfaceDef.extAttrs.tokens.open.trivia,
     );
     const memberIndent = interfaceDef.members.length
       ? (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getLastIndentation)((0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getFirstToken)(interfaceDef.members[0]).trivia)
       : (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.getMemberIndentation)(indentation);
     const constructorOp = _constructor_js__WEBPACK_IMPORTED_MODULE_8__.Constructor.parse(
-      new _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__.Tokeniser(`\n${memberIndent}constructor();`)
+      new _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__.Tokeniser(`\n${memberIndent}constructor();`),
     );
     constructorOp.extAttrs = new _extended_attributes_js__WEBPACK_IMPORTED_MODULE_10__.ExtendedAttributes({
       source: interfaceDef.source,
@@ -2764,7 +2892,7 @@ function autofixConstructor(interfaceDef, constructorExtAttr) {
 
     const existingIndex = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_5__.findLastIndex)(
       interfaceDef.members,
-      (m) => m.type === "constructor"
+      (m) => m.type === "constructor",
     );
     interfaceDef.members.splice(existingIndex + 1, 0, constructorOp);
 
@@ -2793,7 +2921,7 @@ function autofixConstructor(interfaceDef, constructorExtAttr) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Container": () => (/* binding */ Container)
+/* harmony export */   Container: () => (/* binding */ Container)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(8);
@@ -2816,6 +2944,19 @@ function inheritance(tokeniser) {
   return { colon, inheritance };
 }
 
+/**
+ * Parser callback.
+ * @callback ParserCallback
+ * @param {import("../tokeniser.js").Tokeniser} tokeniser
+ * @param {...*} args
+ */
+
+/**
+ * A parser callback and optional option object.
+ * @typedef AllowedMember
+ * @type {[ParserCallback, object?]}
+ */
+
 class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
@@ -2889,7 +3030,7 @@ class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.colon),
         w.ts.trivia(this.tokens.inheritance.trivia),
         w.ts.inheritance(
-          w.reference(this.tokens.inheritance.value, { context: this })
+          w.reference(this.tokens.inheritance.value, { context: this }),
         ),
       ]);
     };
@@ -2908,7 +3049,7 @@ class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.close),
         w.token(this.tokens.termination),
       ]),
-      { data: this }
+      { data: this },
     );
   }
 }
@@ -2920,7 +3061,7 @@ class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Constant": () => (/* binding */ Constant)
+/* harmony export */   Constant: () => (/* binding */ Constant)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _type_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(5);
@@ -2989,7 +3130,7 @@ class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.value),
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent }
+      { data: this, parent },
     );
   }
 }
@@ -3001,21 +3142,23 @@ class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "IterableLike": () => (/* binding */ IterableLike)
+/* harmony export */   IterableLike: () => (/* binding */ IterableLike)
 /* harmony export */ });
-/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
-/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(4);
 
 
 
-class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
+
+class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_1__.Base {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
    */
   static parse(tokeniser) {
     const start_position = tokeniser.position;
-    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.autoParenter)(
-      new IterableLike({ source: tokeniser.source, tokens: {} })
+    const ret = (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.autoParenter)(
+      new IterableLike({ source: tokeniser.source, tokens: {} }),
     );
     const { tokens } = ret;
     tokens.readonly = tokeniser.consume("readonly");
@@ -3025,8 +3168,8 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
     tokens.base = tokens.readonly
       ? tokeniser.consume("maplike", "setlike")
       : tokens.async
-      ? tokeniser.consume("iterable")
-      : tokeniser.consume("iterable", "maplike", "setlike");
+        ? tokeniser.consume("iterable")
+        : tokeniser.consume("iterable", "async_iterable", "maplike", "setlike");
     if (!tokens.base) {
       tokeniser.unconsume(start_position);
       return;
@@ -3034,14 +3177,16 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
     const { type } = ret;
     const secondTypeRequired = type === "maplike";
-    const secondTypeAllowed = secondTypeRequired || type === "iterable";
-    const argumentAllowed = ret.async && type === "iterable";
+    const secondTypeAllowed =
+      secondTypeRequired || type === "iterable" || type === "async_iterable";
+    const argumentAllowed =
+      type === "async_iterable" || (ret.async && type === "iterable");
 
     tokens.open =
       tokeniser.consume("<") ||
       tokeniser.error(`Missing less-than sign \`<\` in ${type} declaration`);
     const first =
-      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser) ||
+      (0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.type_with_extended_attributes)(tokeniser) ||
       tokeniser.error(`Missing a type argument in ${type} declaration`);
     ret.idlType = [first];
     ret.arguments = [];
@@ -3049,7 +3194,7 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
     if (secondTypeAllowed) {
       first.tokens.separator = tokeniser.consume(",");
       if (first.tokens.separator) {
-        ret.idlType.push((0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.type_with_extended_attributes)(tokeniser));
+        ret.idlType.push((0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.type_with_extended_attributes)(tokeniser));
       } else if (secondTypeRequired) {
         tokeniser.error(`Missing second type argument in ${type} declaration`);
       }
@@ -3062,7 +3207,7 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
     if (tokeniser.probe("(")) {
       if (argumentAllowed) {
         tokens.argsOpen = tokeniser.consume("(");
-        ret.arguments.push(...(0,_helpers_js__WEBPACK_IMPORTED_MODULE_1__.argument_list)(tokeniser));
+        ret.arguments.push(...(0,_helpers_js__WEBPACK_IMPORTED_MODULE_2__.argument_list)(tokeniser));
         tokens.argsClose =
           tokeniser.consume(")") ||
           tokeniser.error("Unterminated async iterable argument list");
@@ -3089,6 +3234,18 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
   }
 
   *validate(defs) {
+    if (this.async && this.type === "iterable") {
+      const message = "`async iterable` is now changed to `async_iterable`.";
+      yield (0,_error_js__WEBPACK_IMPORTED_MODULE_0__.validationError)(
+        this.tokens.async,
+        this,
+        "obsolete-async-iterable-syntax",
+        message,
+        {
+          autofix: autofixAsyncIterableSyntax(this),
+        },
+      );
+    }
     for (const type of this.idlType) {
       yield* type.validate(defs);
     }
@@ -3113,11 +3270,26 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.argsClose),
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent: this.parent }
+      { data: this, parent: this.parent },
     );
   }
 }
 
+/**
+ * @param {IterableLike} iterableLike
+ */
+function autofixAsyncIterableSyntax(iterableLike) {
+  return () => {
+    const async = iterableLike.tokens.async;
+    iterableLike.tokens.base = {
+      ...async,
+      type: "async_iterable",
+      value: "async_iterable",
+    };
+    delete iterableLike.tokens.async;
+  };
+}
+
 
 /***/ }),
 /* 23 */
@@ -3125,7 +3297,7 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "checkInterfaceMemberDuplication": () => (/* binding */ checkInterfaceMemberDuplication)
+/* harmony export */   checkInterfaceMemberDuplication: () => (/* binding */ checkInterfaceMemberDuplication)
 /* harmony export */ });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
 
@@ -3164,7 +3336,7 @@ function* checkInterfaceMemberDuplication(defs, i) {
           addition.tokens.name,
           ext,
           "no-cross-overload",
-          message
+          message,
         );
       }
     }
@@ -3185,10 +3357,10 @@ function* checkInterfaceMemberDuplication(defs, i) {
     const ops = getOperations(i);
     return {
       statics: new Set(
-        ops.filter((op) => op.special === "static").map((op) => op.name)
+        ops.filter((op) => op.special === "static").map((op) => op.name),
       ),
       nonstatics: new Set(
-        ops.filter((op) => op.special !== "static").map((op) => op.name)
+        ops.filter((op) => op.special !== "static").map((op) => op.name),
       ),
     };
   }
@@ -3201,7 +3373,7 @@ function* checkInterfaceMemberDuplication(defs, i) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Constructor": () => (/* binding */ Constructor)
+/* harmony export */   Constructor: () => (/* binding */ Constructor)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -3255,7 +3427,7 @@ class Constructor extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         w.token(this.tokens.close),
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent }
+      { data: this, parent },
     );
   }
 }
@@ -3267,7 +3439,7 @@ class Constructor extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Mixin": () => (/* binding */ Mixin)
+/* harmony export */   Mixin: () => (/* binding */ Mixin)
 /* harmony export */ });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(21);
@@ -3282,14 +3454,13 @@ __webpack_require__.r(__webpack_exports__);
 
 class Mixin extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
   /**
-   * @typedef {import("../tokeniser.js").Token} Token
-   *
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
-   * @param {Token} base
+   * @param {import("../tokeniser.js").Token} base
    * @param {object} [options]
-   * @param {Token} [options.partial]
+   * @param {import("./container.js").AllowedMember[]} [options.extMembers]
+   * @param {import("../tokeniser.js").Token} [options.partial]
    */
-  static parse(tokeniser, base, { partial } = {}) {
+  static parse(tokeniser, base, { extMembers = [], partial } = {}) {
     const tokens = { partial, base };
     tokens.mixin = tokeniser.consume("mixin");
     if (!tokens.mixin) {
@@ -3300,12 +3471,13 @@ class Mixin extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
       new Mixin({ source: tokeniser.source, tokens }),
       {
         allowedMembers: [
+          ...extMembers,
           [_constant_js__WEBPACK_IMPORTED_MODULE_1__.Constant.parse],
           [_helpers_js__WEBPACK_IMPORTED_MODULE_4__.stringifier],
           [_attribute_js__WEBPACK_IMPORTED_MODULE_2__.Attribute.parse, { noInherit: true }],
           [_operation_js__WEBPACK_IMPORTED_MODULE_3__.Operation.parse, { regular: true }],
         ],
-      }
+      },
     );
   }
 
@@ -3321,7 +3493,7 @@ class Mixin extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Dictionary": () => (/* binding */ Dictionary)
+/* harmony export */   Dictionary: () => (/* binding */ Dictionary)
 /* harmony export */ });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _field_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(27);
@@ -3332,9 +3504,10 @@ class Dictionary extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
    * @param {object} [options]
+   * @param {import("./container.js").AllowedMember[]} [options.extMembers]
    * @param {import("../tokeniser.js").Token} [options.partial]
    */
-  static parse(tokeniser, { partial } = {}) {
+  static parse(tokeniser, { extMembers = [], partial } = {}) {
     const tokens = { partial };
     tokens.base = tokeniser.consume("dictionary");
     if (!tokens.base) {
@@ -3345,8 +3518,8 @@ class Dictionary extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
       new Dictionary({ source: tokeniser.source, tokens }),
       {
         inheritable: !partial,
-        allowedMembers: [[_field_js__WEBPACK_IMPORTED_MODULE_1__.Field.parse]],
-      }
+        allowedMembers: [...extMembers, [_field_js__WEBPACK_IMPORTED_MODULE_1__.Field.parse]],
+      },
     );
   }
 
@@ -3362,7 +3535,7 @@ class Dictionary extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Field": () => (/* binding */ Field)
+/* harmony export */   Field: () => (/* binding */ Field)
 /* harmony export */ });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
@@ -3424,7 +3597,7 @@ class Field extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
         this.default ? this.default.write(w) : "",
         w.token(this.tokens.termination),
       ]),
-      { data: this, parent }
+      { data: this, parent },
     );
   }
 }
@@ -3436,7 +3609,7 @@ class Field extends _base_js__WEBPACK_IMPORTED_MODULE_0__.Base {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Namespace": () => (/* binding */ Namespace)
+/* harmony export */   Namespace: () => (/* binding */ Namespace)
 /* harmony export */ });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(14);
@@ -3455,9 +3628,10 @@ class Namespace extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
    * @param {object} [options]
+   * @param {import("./container.js").AllowedMember[]} [options.extMembers]
    * @param {import("../tokeniser.js").Token} [options.partial]
    */
-  static parse(tokeniser, { partial } = {}) {
+  static parse(tokeniser, { extMembers = [], partial } = {}) {
     const tokens = { partial };
     tokens.base = tokeniser.consume("namespace");
     if (!tokens.base) {
@@ -3468,11 +3642,12 @@ class Namespace extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
       new Namespace({ source: tokeniser.source, tokens }),
       {
         allowedMembers: [
+          ...extMembers,
           [_attribute_js__WEBPACK_IMPORTED_MODULE_1__.Attribute.parse, { noInherit: true, readonly: true }],
           [_constant_js__WEBPACK_IMPORTED_MODULE_5__.Constant.parse],
           [_operation_js__WEBPACK_IMPORTED_MODULE_2__.Operation.parse, { regular: true }],
         ],
-      }
+      },
     );
   }
 
@@ -3497,7 +3672,7 @@ for more information.`;
         message,
         {
           autofix: (0,_helpers_js__WEBPACK_IMPORTED_MODULE_4__.autofixAddExposedWindow)(this),
-        }
+        },
       );
     }
     yield* super.validate(defs);
@@ -3511,7 +3686,7 @@ for more information.`;
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "CallbackInterface": () => (/* binding */ CallbackInterface)
+/* harmony export */   CallbackInterface: () => (/* binding */ CallbackInterface)
 /* harmony export */ });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(13);
@@ -3523,8 +3698,11 @@ __webpack_require__.r(__webpack_exports__);
 class CallbackInterface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Container {
   /**
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {*} callback
+   * @param {object} [options]
+   * @param {import("./container.js").AllowedMember[]} [options.extMembers]
    */
-  static parse(tokeniser, callback, { partial = null } = {}) {
+  static parse(tokeniser, callback, { extMembers = [] } = {}) {
     const tokens = { callback };
     tokens.base = tokeniser.consume("interface");
     if (!tokens.base) {
@@ -3534,12 +3712,12 @@ class CallbackInterface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Conta
       tokeniser,
       new CallbackInterface({ source: tokeniser.source, tokens }),
       {
-        inheritable: !partial,
         allowedMembers: [
+          ...extMembers,
           [_constant_js__WEBPACK_IMPORTED_MODULE_2__.Constant.parse],
           [_operation_js__WEBPACK_IMPORTED_MODULE_1__.Operation.parse, { regular: true }],
         ],
-      }
+      },
     );
   }
 
@@ -3555,8 +3733,8 @@ class CallbackInterface extends _container_js__WEBPACK_IMPORTED_MODULE_0__.Conta
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "Writer": () => (/* binding */ Writer),
-/* harmony export */   "write": () => (/* binding */ write)
+/* harmony export */   Writer: () => (/* binding */ Writer),
+/* harmony export */   write: () => (/* binding */ write)
 /* harmony export */ });
 function noop(arg) {
   return arg;
@@ -3640,7 +3818,7 @@ function write(ast, { templates: ts = templates } = {}) {
 
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "validate": () => (/* binding */ validate)
+/* harmony export */   validate: () => (/* binding */ validate)
 /* harmony export */ });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
 
@@ -3797,14 +3975,14 @@ function validate(ast) {
 /******/ 	
 /************************************************************************/
 var __webpack_exports__ = {};
-// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
+// This entry needs to be wrapped in an IIFE because it needs to be isolated against other modules in the chunk.
 (() => {
 __webpack_require__.r(__webpack_exports__);
 /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-/* harmony export */   "WebIDLParseError": () => (/* reexport safe */ _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__.WebIDLParseError),
-/* harmony export */   "parse": () => (/* reexport safe */ _lib_webidl2_js__WEBPACK_IMPORTED_MODULE_0__.parse),
-/* harmony export */   "validate": () => (/* reexport safe */ _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__.validate),
-/* harmony export */   "write": () => (/* reexport safe */ _lib_writer_js__WEBPACK_IMPORTED_MODULE_1__.write)
+/* harmony export */   WebIDLParseError: () => (/* reexport safe */ _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__.WebIDLParseError),
+/* harmony export */   parse: () => (/* reexport safe */ _lib_webidl2_js__WEBPACK_IMPORTED_MODULE_0__.parse),
+/* harmony export */   validate: () => (/* reexport safe */ _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__.validate),
+/* harmony export */   write: () => (/* reexport safe */ _lib_writer_js__WEBPACK_IMPORTED_MODULE_1__.write)
 /* harmony export */ });
 /* harmony import */ var _lib_webidl2_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(1);
 /* harmony import */ var _lib_writer_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(30);
diff --git a/tests/wpt/tests/service-workers/service-worker/intercepted-referrer.https.html b/tests/wpt/tests/service-workers/service-worker/intercepted-referrer.https.html
new file mode 100644
index 00000000000..72d78945139
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/intercepted-referrer.https.html
@@ -0,0 +1,51 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Service Worker intercepted navigation preserves document.referrer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+
+<body>
+<h1>Service Worker intercepted navigation preserves document.referrer</h1>
+<script>
+promise_test(async t => {
+  // Scope where the SW will control navigations.
+  // This lives under the same directory as the SW script below.
+  const scope = 'resources/referrer-scope/';
+
+  // Ensure a clean registration, then register the SW.
+  const reg = await service_worker_unregister_and_register(
+      t, 'resources/intercepted-referrer-sw.js', scope);
+
+  // Wait for activation (handles fresh or already-active cases).
+  const worker = reg.installing || reg.waiting || reg.active;
+  await wait_for_state(t, worker, 'activated');
+
+  // We’ll get one message back from the intercepted document.
+  const messagePromise = new Promise(resolve => {
+    window.addEventListener('message', e => resolve(e.data), { once: true });
+  });
+
+  // Create a navigation under the SW’s scope. The SW will synthesize the page.
+  const iframe = document.createElement('iframe');
+  t.add_cleanup(() => iframe.remove());
+  iframe.src = scope + 'navigated.html';
+  document.body.append(iframe);
+
+  const data = await messagePromise;
+
+  // Basic sanity from the child payload.
+  assert_equals(data && data.source, 'sw-intercepted', 'Child payload is from SW response');
+
+  // document.referrer should be the full URL of this test page (same-origin default policy).
+  // WPT servers send same-origin requests with full referrer (default "strict-origin-when-cross-origin").
+  const expectedReferrer = location.href;
+
+  assert_equals(data.referrer, expectedReferrer,
+    'document.referrer inside the SW-synthesized document equals the parent test page URL');
+
+  // Clean up: unregister the SW.
+  t.add_cleanup(() => reg.unregister());
+}, 'document.referrer for a navigation intercepted by a Service Worker is unchanged and matches the parent URL');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/intercepted-referrer-sw.js b/tests/wpt/tests/service-workers/service-worker/resources/intercepted-referrer-sw.js
new file mode 100644
index 00000000000..f0246c8dbe4
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/resources/intercepted-referrer-sw.js
@@ -0,0 +1,35 @@
+self.addEventListener('install', event => {
+  // Activate immediately to simplify the test.
+  event.waitUntil(self.skipWaiting());
+});
+
+self.addEventListener('activate', event => {
+  // Make sure the very next navigation is controlled by this SW.
+  event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener('fetch', event => {
+  // Only handle top-level navigations within our scope.
+  if (event.request.mode === 'navigate') {
+    const html = `<!doctype html>
+      <meta charset="utf-8">
+      <title>SW Intercepted Page</title>
+      <script>
+        // Post the referrer observed by this new Document.
+        window.addEventListener('load', () => {
+          parent.postMessage({
+            source: 'sw-intercepted',
+            referrer: document.referrer,
+            url: location.href
+          }, '*');
+        });
+      </script>
+      <h1>SW-synthesized page</h1>
+      <p>This page was served by a Service Worker via respondWith().</p>`;
+
+    event.respondWith(new Response(html, {
+      headers: { 'Content-Type': 'text/html; charset=utf-8' }
+    }));
+  }
+  // Otherwise, fall through to network.
+});
diff --git a/tests/wpt/tests/speech-api/idlharness.window.js b/tests/wpt/tests/speech-api/idlharness.https.window.js
similarity index 100%
rename from tests/wpt/tests/speech-api/idlharness.window.js
rename to tests/wpt/tests/speech-api/idlharness.https.window.js
diff --git a/tests/wpt/tests/storage-access-api/requestStorageAccess-sandboxed-iframe-allow-storage-access.sub.https.window.js b/tests/wpt/tests/storage-access-api/requestStorageAccess-sandboxed-iframe-allow-storage-access.sub.https.window.js
index c163245ce36..faff38daf9b 100644
--- a/tests/wpt/tests/storage-access-api/requestStorageAccess-sandboxed-iframe-allow-storage-access.sub.https.window.js
+++ b/tests/wpt/tests/storage-access-api/requestStorageAccess-sandboxed-iframe-allow-storage-access.sub.https.window.js
@@ -7,6 +7,6 @@ const frameSourceUrl =
     'https://{{hosts[alt][www]}}:{{ports[https][0]}}/storage-access-api/resources/sandboxed-iframe-allow-storage-access.html';
 
 const sandboxAttribute =
-    'allow-scripts allow-same-origin allow-storage-access-by-user-activation';
+    'allow-scripts allow-same-origin allow-storage-access-by-user-activation allow-popups';
 
 RunTestsInIFrame(frameSourceUrl, sandboxAttribute);
diff --git a/tests/wpt/tests/storage-access-api/resources/sandboxed-iframe-allow-storage-access.html b/tests/wpt/tests/storage-access-api/resources/sandboxed-iframe-allow-storage-access.html
index 4df0de7719d..4510b8f83fc 100644
--- a/tests/wpt/tests/storage-access-api/resources/sandboxed-iframe-allow-storage-access.html
+++ b/tests/wpt/tests/storage-access-api/resources/sandboxed-iframe-allow-storage-access.html
@@ -29,6 +29,7 @@
     t.add_cleanup(async () => {
       await test_driver.set_permission({name: 'storage-access'}, 'prompt');
     });
+    await SetFirstPartyCookie(location.origin, "initial-cookie=unpartitioned;Secure;SameSite=None;Path=/");
     await test_driver.set_permission({name: 'storage-access'}, 'granted');
     await MaybeSetStorageAccess('*', '*', 'blocked');
     await document.requestStorageAccess();
@@ -45,6 +46,7 @@
     t.add_cleanup(async () => {
       await test_driver.set_permission({name: 'storage-access'}, 'prompt');
     });
+    await SetFirstPartyCookie(location.origin, "initial-cookie=unpartitioned;Secure;SameSite=None;Path=/");
     await test_driver.set_permission({name: 'storage-access'}, 'granted');
     await MaybeSetStorageAccess('*', '*', 'blocked');
 
diff --git a/tests/wpt/tests/streams/readable-byte-streams/bad-buffers-and-views.any.js b/tests/wpt/tests/streams/readable-byte-streams/bad-buffers-and-views.any.js
index afcc61e6800..eae8dde03f6 100644
--- a/tests/wpt/tests/streams/readable-byte-streams/bad-buffers-and-views.any.js
+++ b/tests/wpt/tests/streams/readable-byte-streams/bad-buffers-and-views.any.js
@@ -123,8 +123,7 @@ promise_test(t => {
 async_test(t => {
   const stream = new ReadableStream({
     pull: t.step_func_done(c => {
-      // Detach it by reading into it
-      reader.read(c.byobRequest.view);
+      c.byobRequest.view.buffer.transfer();
 
       assert_throws_js(TypeError, () => c.byobRequest.respond(1),
         'respond() must throw if the corresponding view has become detached');
@@ -141,9 +140,7 @@ async_test(t => {
   const stream = new ReadableStream({
     pull: t.step_func_done(c => {
       c.close();
-
-      // Detach it by reading into it
-      reader.read(c.byobRequest.view);
+      c.byobRequest.view.buffer.transfer();
 
       assert_throws_js(TypeError, () => c.byobRequest.respond(0),
         'respond() must throw if the corresponding view has become detached');
@@ -159,9 +156,8 @@ async_test(t => {
 async_test(t => {
   const stream = new ReadableStream({
     pull: t.step_func_done(c => {
-      // Detach it by reading into it
       const view = new Uint8Array([1, 2, 3]);
-      reader.read(view);
+      view.buffer.transfer();
 
       assert_throws_js(TypeError, () => c.byobRequest.respondWithNewView(view));
     }),
@@ -364,8 +360,7 @@ async_test(t => {
 async_test(t => {
   const stream = new ReadableStream({
     pull: t.step_func_done(c => {
-      // Detach it by reading into it
-      reader.read(c.byobRequest.view);
+      c.byobRequest.view.buffer.transfer();
 
       assert_throws_js(TypeError, () => c.enqueue(new Uint8Array([1])),
         'enqueue() must throw if the BYOB request\'s buffer has become detached');
@@ -382,9 +377,7 @@ async_test(t => {
   const stream = new ReadableStream({
     pull: t.step_func_done(c => {
       c.close();
-
-      // Detach it by reading into it
-      reader.read(c.byobRequest.view);
+      c.byobRequest.view.buffer.transfer();
 
       assert_throws_js(TypeError, () => c.enqueue(new Uint8Array([1])),
         'enqueue() must throw if the BYOB request\'s buffer has become detached');
diff --git a/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-helper.svg b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-helper.svg
new file mode 100644
index 00000000000..f4b5f8c0c5d
--- /dev/null
+++ b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-helper.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+    <style><![CDATA[
+        svg {
+            background-image: url(/images/blue.png);
+        }
+    ]]></style>
+</svg>
diff --git a/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-ref.html b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-ref.html
new file mode 100644
index 00000000000..7d3b74ec048
--- /dev/null
+++ b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet-ref.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1982344">
+<style>
+div {
+  display: inline-block;
+  width: 100px;
+  height: 100px;
+}
+.blue {
+  background-color: red;
+  background-image: url(/images/blue.png);
+}
+</style>
+
+<div></div>
+<div class="blue"></div>
diff --git a/tests/wpt/tests/svg/as-image/external-resource-inline-sheet.html b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet.html
new file mode 100644
index 00000000000..b3017c7bae9
--- /dev/null
+++ b/tests/wpt/tests/svg/as-image/external-resource-inline-sheet.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>SVG as image loading external resource from an inline sheet</title>
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1982344">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.com" title="Mozilla">
+<link rel="match" href="external-resource-inline-sheet-ref.html">
+<img src="external-resource-inline-sheet-helper.svg?0" width=100 height=100>
+<object data="external-resource-inline-sheet-helper.svg?1" type="image/svg+xml" width=100 height=100></object>
diff --git a/tests/wpt/tests/svg/painting/marker-009.svg b/tests/wpt/tests/svg/painting/marker-009.svg
index 9e6fe21d917..e4b71011d67 100644
--- a/tests/wpt/tests/svg/painting/marker-009.svg
+++ b/tests/wpt/tests/svg/painting/marker-009.svg
@@ -2,6 +2,7 @@
     <html:link rel="help" href="https://www.w3.org/TR/2016/CR-SVG2-20160915/painting.html#OrientAttribute"/>
     <html:link rel="match" href="marker-009-ref.svg"/>
     <html:meta name="assert" content="Tests correct number of markers are drawn on multiple sub-paths"/>
+    <html:meta name="fuzzy" content="maxDifference=0-2;totalPixels=0-50"/>
     <defs>
         <marker id="m1" markerUnits="userSpaceOnUse" overflow="visible">
             <circle cx="0" cy="0" r="25" fill="green"/>
diff --git a/tests/wpt/tests/svg/styling/use-element-attr-selector-transition.html b/tests/wpt/tests/svg/styling/use-element-attr-selector-transition.html
new file mode 100644
index 00000000000..3a617cc315c
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-attr-selector-transition.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Attribute change in template starts transition in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  #rect { fill: black; transition: fill 1000s steps(2, start); }
+  [attr] > #rect { fill: lime; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <rect id="rect" width="100" height="100"></rect>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      tmpl.setAttribute("attr", "val");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-attr-selector.html b/tests/wpt/tests/svg/styling/use-element-attr-selector.html
new file mode 100644
index 00000000000..8994d907534
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-attr-selector.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Attribute change in template affects attribute selector matching in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  [attr] > #rect { fill: green; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <rect id="rect" width="100" height="100"></rect>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      tmpl.setAttribute("attr", "val");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-class-selector-transition.html b/tests/wpt/tests/svg/styling/use-element-class-selector-transition.html
new file mode 100644
index 00000000000..73c3b1da6c0
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-class-selector-transition.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Class change in template starts transition in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  #rect { fill: black; transition: fill 1000s steps(2, start); }
+  .class > #rect { fill: lime; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <rect id="rect" width="100" height="100"></rect>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      tmpl.setAttribute("class", "class");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-class-selector.html b/tests/wpt/tests/svg/styling/use-element-class-selector.html
new file mode 100644
index 00000000000..d53d462cae8
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-class-selector.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Class change in template affects class selector matching in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  .class > #rect { fill: green; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <rect id="rect" width="100" height="100"></rect>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      tmpl.setAttribute("class", "class");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-id-selector-transition.html b/tests/wpt/tests/svg/styling/use-element-id-selector-transition.html
new file mode 100644
index 00000000000..83702aff752
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-id-selector-transition.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Id change in template starts transition in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  #rect { fill: black; transition: fill 1000s steps(2, start); }
+  #id > #rect { fill: lime; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <g id="no_id">
+        <rect id="rect" width="100" height="100"></rect>
+      </g>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      no_id.setAttribute("id", "id");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-id-selector.html b/tests/wpt/tests/svg/styling/use-element-id-selector.html
new file mode 100644
index 00000000000..ce71e3610c7
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-id-selector.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: Id change in template affects id selector matching in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  #id > #rect { fill: green; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <g id="no_id">
+        <rect id="rect" width="100" height="100"></rect>
+      </g>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      no_id.setAttribute("id", "id");
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/styling/use-element-selector-ref.html b/tests/wpt/tests/svg/styling/use-element-selector-ref.html
new file mode 100644
index 00000000000..b428098e205
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-selector-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<title>SVG Test Reference</title>
+<svg>
+  <rect width="100" height="100" fill="green"></rect>
+</svg>
diff --git a/tests/wpt/tests/svg/styling/use-element-transitions-dom-mutation.html b/tests/wpt/tests/svg/styling/use-element-transitions-dom-mutation.html
new file mode 100644
index 00000000000..897c9dfa17f
--- /dev/null
+++ b/tests/wpt/tests/svg/styling/use-element-transitions-dom-mutation.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>SVG Test: DOM mutations in template should not stop transition in &lt;use&gt; element tree</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/struct.html#UseElement">
+<link rel="match" href="use-element-selector-ref.html">
+<style>
+  #rect { fill: black; transition: fill 1000s steps(2, start); }
+  .class > #rect { fill: lime; }
+</style>
+<svg>
+  <use id="use_elm" xlink:href="#tmpl" />
+  <defs>
+    <g id="tmpl">
+      <rect id="rect" width="100" height="100"></rect>
+      <text id="txt">FAIL</text>
+    </g>
+  </defs>
+</svg>
+<script>
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      tmpl.setAttribute("class", "class");
+      requestAnimationFrame(() => {
+        txt.remove();
+        document.documentElement.classList.remove('reftest-wait');
+      });
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/svg/types/scripted/SVGAnimatedInteger.html b/tests/wpt/tests/svg/types/scripted/SVGAnimatedInteger.html
index e8e8b30a7a5..1ed590b52ee 100644
--- a/tests/wpt/tests/svg/types/scripted/SVGAnimatedInteger.html
+++ b/tests/wpt/tests/svg/types/scripted/SVGAnimatedInteger.html
@@ -21,7 +21,8 @@ test(function() {
 
   // Check assigning various valid and invalid values.
   feConvolveMatrix.targetX.baseVal = -1;
-  assert_equals(feConvolveMatrix.targetX.baseVal, -1); // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  assert_equals(feConvolveMatrix.targetX.baseVal, -1);
   feConvolveMatrix.targetX.baseVal = 300;
   assert_equals(feConvolveMatrix.targetX.baseVal, 300);
   // ECMA-262, 9.5, "ToInt32"
@@ -41,8 +42,12 @@ test(function() {
   feConvolveMatrix.setAttribute("order", "5");
   assert_equals(feConvolveMatrix.orderX.baseVal, 5);
   feConvolveMatrix.setAttribute("order", "-1.5");
-  assert_equals(feConvolveMatrix.orderX.baseVal, -1);
-  feConvolveMatrix.orderX.baseVal = -2.7;
-  assert_equals(feConvolveMatrix.orderX.baseVal, -2); // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  // Invalid values should result in the initial value being returned
+  // For orderX that is 3 per
+  // https://www.w3.org/TR/filter-effects-1/#element-attrdef-order
+  assert_equals(feConvolveMatrix.orderX.baseVal, 3);
+  feConvolveMatrix.orderX.baseVal = -2;
+  // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  assert_equals(feConvolveMatrix.orderX.baseVal, -2);
 });
 </script>
diff --git a/tests/wpt/tests/svg/types/scripted/SVGAnimatedNumber.html b/tests/wpt/tests/svg/types/scripted/SVGAnimatedNumber.html
index c72cabca1a8..3852665c50e 100644
--- a/tests/wpt/tests/svg/types/scripted/SVGAnimatedNumber.html
+++ b/tests/wpt/tests/svg/types/scripted/SVGAnimatedNumber.html
@@ -20,7 +20,8 @@ test(function() {
   assert_equals(feSpecularLightingElement.surfaceScale.baseVal, 1);
 
   // Check assigning various valid and invalid values.
-  feSpecularLightingElement.surfaceScale.baseVal = -1; // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  // Negative values are allowed from SVG DOM, but should lead to an error when rendering (disable the filter)
+  feSpecularLightingElement.surfaceScale.baseVal = -1;
   assert_equals(feSpecularLightingElement.surfaceScale.baseVal, -1);
   feSpecularLightingElement.surfaceScale.baseVal = 300;
   assert_equals(feSpecularLightingElement.surfaceScale.baseVal, 300);
diff --git a/tests/wpt/tests/tools/ci/tc/tasks/test.yml b/tests/wpt/tests/tools/ci/tc/tasks/test.yml
index ebf3098b6af..b67821cce1d 100644
--- a/tests/wpt/tests/tools/ci/tc/tasks/test.yml
+++ b/tests/wpt/tests/tools/ci/tc/tasks/test.yml
@@ -247,12 +247,6 @@ tasks:
               use:
                 - trigger-weekly
                 - trigger-push
-            - vars:
-                browser: servo
-                channel: nightly
-              use:
-                - trigger-daily
-                - trigger-push
             - vars:
                 browser: firefox_android
                 channel: nightly
@@ -278,6 +272,39 @@ tasks:
                   of ${chunks.total}), run in the ${vars.channel} release of
                   ${vars.browser}.
 
+  # Servo is handled separately to skip the wdspec suite until
+  # https://github.com/servo/servo/issues/38586 is resolved.
+  - $map:
+      for:
+        - vars:
+            suite: testharness
+        - vars:
+            suite: reftest
+        - vars:
+            suite: crashtest
+      do:
+        $map:
+          for:
+            - vars:
+                browser: servo
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
+          do:
+            - ${vars.browser}-${vars.channel}-${vars.suite}:
+                use:
+                  - wpt-base
+                  - run-options
+                  - wpt-run
+                  - browser-${vars.browser}
+                  - wpt-${vars.suite}
+                description: >-
+                  A subset of WPT's "${vars.suite}" tests (chunk number ${chunks.id}
+                  of ${chunks.total}), run in the ${vars.channel} release of
+                  ${vars.browser}.
+
+
   # print-reftest are currently only supported by Chrome and Firefox.
   - $map:
       for:
diff --git a/tests/wpt/tests/tools/ci/tc/tests/test_valid.py b/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
index a8390936cad..023744268c0 100644
--- a/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
+++ b/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
@@ -285,22 +285,6 @@ def test_verify_payload():
       'wpt-wpewebkit_minibrowser-nightly-testharness-14',
       'wpt-wpewebkit_minibrowser-nightly-testharness-15',
       'wpt-wpewebkit_minibrowser-nightly-testharness-16',
-      'wpt-servo-nightly-testharness-1',
-      'wpt-servo-nightly-testharness-2',
-      'wpt-servo-nightly-testharness-3',
-      'wpt-servo-nightly-testharness-4',
-      'wpt-servo-nightly-testharness-5',
-      'wpt-servo-nightly-testharness-6',
-      'wpt-servo-nightly-testharness-7',
-      'wpt-servo-nightly-testharness-8',
-      'wpt-servo-nightly-testharness-9',
-      'wpt-servo-nightly-testharness-10',
-      'wpt-servo-nightly-testharness-11',
-      'wpt-servo-nightly-testharness-12',
-      'wpt-servo-nightly-testharness-13',
-      'wpt-servo-nightly-testharness-14',
-      'wpt-servo-nightly-testharness-15',
-      'wpt-servo-nightly-testharness-16',
       'wpt-firefox_android-nightly-testharness-1',
       'wpt-firefox_android-nightly-testharness-2',
       'wpt-firefox_android-nightly-testharness-3',
@@ -391,12 +375,6 @@ def test_verify_payload():
       'wpt-wpewebkit_minibrowser-nightly-reftest-4',
       'wpt-wpewebkit_minibrowser-nightly-reftest-5',
       'wpt-wpewebkit_minibrowser-nightly-reftest-6',
-      'wpt-servo-nightly-reftest-1',
-      'wpt-servo-nightly-reftest-2',
-      'wpt-servo-nightly-reftest-3',
-      'wpt-servo-nightly-reftest-4',
-      'wpt-servo-nightly-reftest-5',
-      'wpt-servo-nightly-reftest-6',
       'wpt-firefox_android-nightly-reftest-1',
       'wpt-firefox_android-nightly-reftest-2',
       'wpt-firefox_android-nightly-reftest-3',
@@ -419,8 +397,6 @@ def test_verify_payload():
       'wpt-webkitgtk_minibrowser-nightly-wdspec-2',
       'wpt-wpewebkit_minibrowser-nightly-wdspec-1',
       'wpt-wpewebkit_minibrowser-nightly-wdspec-2',
-      'wpt-servo-nightly-wdspec-1',
-      'wpt-servo-nightly-wdspec-2',
       'wpt-firefox_android-nightly-wdspec-1',
       'wpt-firefox_android-nightly-wdspec-2',
       'wpt-firefox_android-stable-wdspec-1',
@@ -430,9 +406,31 @@ def test_verify_payload():
       'wpt-chrome-stable-crashtest-1',
       'wpt-webkitgtk_minibrowser-nightly-crashtest-1',
       'wpt-wpewebkit_minibrowser-nightly-crashtest-1',
-      'wpt-servo-nightly-crashtest-1',
       'wpt-firefox_android-nightly-crashtest-1',
       'wpt-firefox_android-stable-crashtest-1',
+      'wpt-servo-nightly-testharness-1',
+      'wpt-servo-nightly-testharness-2',
+      'wpt-servo-nightly-testharness-3',
+      'wpt-servo-nightly-testharness-4',
+      'wpt-servo-nightly-testharness-5',
+      'wpt-servo-nightly-testharness-6',
+      'wpt-servo-nightly-testharness-7',
+      'wpt-servo-nightly-testharness-8',
+      'wpt-servo-nightly-testharness-9',
+      'wpt-servo-nightly-testharness-10',
+      'wpt-servo-nightly-testharness-11',
+      'wpt-servo-nightly-testharness-12',
+      'wpt-servo-nightly-testharness-13',
+      'wpt-servo-nightly-testharness-14',
+      'wpt-servo-nightly-testharness-15',
+      'wpt-servo-nightly-testharness-16',
+      'wpt-servo-nightly-reftest-1',
+      'wpt-servo-nightly-reftest-2',
+      'wpt-servo-nightly-reftest-3',
+      'wpt-servo-nightly-reftest-4',
+      'wpt-servo-nightly-reftest-5',
+      'wpt-servo-nightly-reftest-6',
+      'wpt-servo-nightly-crashtest-1',
       'wpt-firefox-stable-print-reftest-1',
       'wpt-chromium-nightly-print-reftest-1',
       'wpt-chrome-stable-print-reftest-1'])
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/emulation.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/emulation.py
index 1704c05ee20..edd335e97bd 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/emulation.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/emulation.py
@@ -1,4 +1,5 @@
-from typing import Any, Dict, List, Mapping, MutableMapping, Optional, Union
+from typing import Any, Dict, List, Literal, Mapping, MutableMapping, Optional, \
+    Union
 
 from ._module import BidiModule, command
 from ..undefined import UNDEFINED, Undefined
@@ -70,6 +71,19 @@ class Emulation(BidiModule):
 
         return params
 
+    @command
+    def set_scripting_enabled(
+            self,
+            enabled: Literal[False, None],
+            contexts: Union[List[str], Undefined] = UNDEFINED,
+            user_contexts: Union[List[str], Undefined] = UNDEFINED,
+    ) -> Mapping[str, Any]:
+        return {
+            "enabled": enabled,
+            "contexts": contexts,
+            "userContexts": user_contexts,
+        }
+
     @command
     def set_screen_orientation_override(
         self,
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
index c8fb1ec4e92..0ca03bb9c76 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
@@ -282,6 +282,19 @@ class Network(BidiModule):
         params: MutableMapping[str, Any] = {"collector": collector}
         return params
 
+    @command
+    def disown_data(
+            self,
+            request: str,
+            data_type: str,
+            collector: str) -> Mapping[str, Any]:
+        params: MutableMapping[str, Any] = {
+            "request": request,
+            "dataType": data_type,
+            "collector": collector,
+        }
+        return params
+
     @command
     def set_cache_behavior(
             self,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
index 7d702878a7e..8e7dfae41eb 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
@@ -86,6 +86,15 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data, subsuite
         # fail to create a session if they don't recognize this capability.
         chrome_options["quitGracefully"] = True
 
+    if trace_categories := kwargs.get("trace_categories"):
+        executor_kwargs["enable_tracing"] = True
+        capabilities["goog:loggingPrefs"] = {
+            "performance": "INFO",
+        }
+        chrome_options["perfLoggingPrefs"] = {
+            "traceCategories": trace_categories,
+        }
+
     # Here we set a few Chrome flags that are always passed.
     # ChromeDriver's "acceptInsecureCerts" capability only controls the current
     # browsing context, whereas the CLI flag works for workers, too.
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
index 2324e043f30..d66616005a8 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -164,6 +164,15 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data,
         capabilities["pageLoadStrategy"] = "eager"
     if test_type in ("reftest", "print-reftest"):
         executor_kwargs["reftest_internal"] = kwargs["reftest_internal"]
+        cache_screenshots = True
+        if run_info_data["os"] == "android":
+            try:
+                major_version = int(run_info_data["version"].split(".", 1)[0])
+            except ValueError:
+                pass
+            else:
+                cache_screenshots = major_version < 14
+        executor_kwargs["cache_screenshots"] = cache_screenshots
     if test_type == "wdspec":
         options = {"args": []}
         if kwargs["binary"]:
@@ -231,7 +240,6 @@ def run_info_extras(logger, default_prefs=None, **kwargs):
           "swgl": bool_pref("gfx.webrender.software"),
           "privateBrowsing": bool_pref("browser.privatebrowsing.autostart"),
           "remoteAsyncEvents": bool_pref("remote.events.async.wheel.enabled"),
-          "remoteCNM": not bool_pref("remote.parent-navigation.enabled"),
           "incOriginInit": os.environ.get("MOZ_ENABLE_INC_ORIGIN_INIT") == "1",
           }
     rv.update(run_info_browser_version(**kwargs))
@@ -256,6 +264,7 @@ def run_info_browser_version(**kwargs):
 def update_properties():
     return ([
         "os",
+        "os_version",
         "debug",
         "display",
         "fission",
@@ -265,7 +274,6 @@ def update_properties():
         "asan",
         "tsan",
         "remoteAsyncEvents",
-        "remoteCNM",
         "sessionHistoryInParent",
         "subsuite"], {
         "os": ["version"],
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
index ced41b5b184..d23940e4b61 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
@@ -185,6 +185,38 @@ class ChromeDriverDevToolsProtocolPart(ProtocolPart):
                                                    body=body)
 
 
+class ChromeDriverTracingProtocolPart(ProtocolPart):
+    name = "tracing"
+
+    def setup(self):
+        self.webdriver = self.parent.webdriver
+
+    def get_trace(self):
+        """Retrieve trace events accumulated by ChromeDriver.
+
+        This also clears ChromeDriver's internal buffer of logged events.
+
+        Returns:
+            JSON in the trace array format [0].
+
+        [0]: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview?tab=t.0#heading=h.f2f0yd51wi15
+        """
+        # Not a standard WebDriver method.
+        perf_data = self.webdriver.send_session_command("POST", "se/log", {
+            "type": "performance",
+        })
+        events = []
+        for entry in perf_data:
+            # Unwrap the inner trace event and discard the unnecessary
+            # ChromeDriver-added fields.
+            data_collected_event = json.loads(entry["message"]).get("message", {})
+            if data_collected_event.get("method") != "Tracing.dataCollected":
+                continue
+            if trace_event := data_collected_event.get("params"):
+                events.append(trace_event)
+        return events
+
+
 class ChromeDriverProtocol(WebDriverProtocol):
     implements = [
         ChromeDriverBaseProtocolPart,
@@ -192,6 +224,7 @@ class ChromeDriverProtocol(WebDriverProtocol):
         ChromeDriverFedCMProtocolPart,
         ChromeDriverTestDriverProtocolPart,
         ChromeDriverTestharnessProtocolPart,
+        ChromeDriverTracingProtocolPart,
     ]
     for base_part in WebDriverProtocol.implements:
         if base_part.name not in {part.name for part in implements}:
@@ -213,6 +246,7 @@ class ChromeDriverBidiProtocol(WebDriverBidiProtocol):
         ChromeDriverDevToolsProtocolPart,
         ChromeDriverFedCMProtocolPart,
         ChromeDriverTestharnessProtocolPart,
+        ChromeDriverTracingProtocolPart,
     ]
     for base_part in WebDriverBidiProtocol.implements:
         if base_part.name not in {part.name for part in implements}:
@@ -258,24 +292,39 @@ def _evaluate_sanitized_result(executor_cls):
 class ChromeDriverCrashTestExecutor(WebDriverCrashtestExecutor):
     protocol_cls = ChromeDriverProtocol
 
-    def __init__(self, *args, sanitizer_enabled=False, **kwargs):
+    def __init__(self, *args, sanitizer_enabled=False, enable_tracing=False, **kwargs):
         super().__init__(*args, **kwargs)
         self.sanitizer_enabled = sanitizer_enabled
+        self.enable_tracing = enable_tracing
+
+    def do_test(self, test):
+        file_result, subtest_results = super().do_test(test)
+        if self.enable_tracing:
+            file_result.extra["trace"] = self.protocol.tracing.get_trace()
+        return file_result, subtest_results
 
 
 @_evaluate_sanitized_result
 class ChromeDriverRefTestExecutor(WebDriverRefTestExecutor):
     protocol_cls = ChromeDriverProtocol
 
-    def __init__(self, *args, sanitizer_enabled=False, **kwargs):
+    def __init__(self, *args, sanitizer_enabled=False, enable_tracing=False, **kwargs):
         super().__init__(*args, **kwargs)
         self.sanitizer_enabled = sanitizer_enabled
+        self.enable_tracing = enable_tracing
+
+    def do_test(self, test):
+        file_result, subtest_results = super().do_test(test)
+        if self.enable_tracing:
+            file_result.extra["trace"] = self.protocol.tracing.get_trace()
+        return file_result, subtest_results
 
 
 @_evaluate_sanitized_result
 class ChromeDriverTestharnessExecutor(WebDriverTestharnessExecutor):
 
-    def __init__(self, *args, sanitizer_enabled=False, reuse_window=False, **kwargs):
+    def __init__(self, *args, sanitizer_enabled=False, enable_tracing=False, reuse_window=False,
+                 **kwargs):
         require_webdriver_bidi = kwargs.get("browser_settings", {}).get(
             "require_webdriver_bidi", None)
         if require_webdriver_bidi:
@@ -285,6 +334,7 @@ class ChromeDriverTestharnessExecutor(WebDriverTestharnessExecutor):
 
         super().__init__(*args, **kwargs)
         self.sanitizer_enabled = sanitizer_enabled
+        self.enable_tracing = enable_tracing
         self.reuse_window = reuse_window
 
     def create_test_window(self, protocol):
@@ -312,11 +362,24 @@ class ChromeDriverTestharnessExecutor(WebDriverTestharnessExecutor):
             self.protocol.testharness.persistent_test_window = test_window
         return test_window
 
+    def do_test(self, test):
+        file_result, subtest_results = super().do_test(test)
+        if self.enable_tracing:
+            file_result.extra["trace"] = self.protocol.tracing.get_trace()
+        return file_result, subtest_results
+
 
 @_evaluate_sanitized_result
 class ChromeDriverPrintRefTestExecutor(WebDriverPrintRefTestExecutor):
     protocol_cls = ChromeDriverProtocol
 
-    def __init__(self, *args, sanitizer_enabled=False, **kwargs):
+    def __init__(self, *args, sanitizer_enabled=False, enable_tracing=False, **kwargs):
         super().__init__(*args, **kwargs)
         self.sanitizer_enabled = sanitizer_enabled
+        self.enable_tracing = enable_tracing
+
+    def do_test(self, test):
+        file_result, subtest_results = super().do_test(test)
+        if self.enable_tracing:
+            file_result.extra["trace"] = self.protocol.tracing.get_trace()
+        return file_result, subtest_results
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index 3607960b41e..37c64e1745b 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -1059,7 +1059,8 @@ class MarionetteRefTestExecutor(RefTestExecutor):
                  debug_info=None, reftest_internal=False,
                  reftest_screenshot="unexpected", ccov=False,
                  group_metadata=None, capabilities=None, debug=False,
-                 browser_version=None, debug_test=False, **kwargs):
+                 browser_version=None, debug_test=False,
+                 cache_screenshots=True, **kwargs):
         """Marionette-based executor for reftests"""
         RefTestExecutor.__init__(self,
                                  logger,
@@ -1082,6 +1083,7 @@ class MarionetteRefTestExecutor(RefTestExecutor):
         self.group_metadata = group_metadata
         self.debug = debug
         self.debug_test = debug_test
+        self.cache_screenshots = cache_screenshots
 
         self.install_extensions = browser.extensions
 
@@ -1225,7 +1227,9 @@ class InternalRefTestImplementation(RefTestImplementation):
         return self.executor.logger
 
     def setup(self, screenshot="unexpected", chrome_scope=False):
-        data = {"screenshot": screenshot, "isPrint": self.executor.is_print}
+        data = {"screenshot": screenshot,
+                "isPrint": self.executor.is_print,
+                "cacheScreenshots": self.executor.cache_screenshots}
         if self.executor.group_metadata is not None:
             data["urlCount"] = {urljoin(self.executor.server_url(key[0]), key[1]):value
                                 for key, value in self.executor.group_metadata.get("url_count", {}).items()
@@ -1234,6 +1238,7 @@ class InternalRefTestImplementation(RefTestImplementation):
         if chrome_scope:
             self.logger.debug("Using marionette Chrome scope for reftests")
             self.executor.protocol.marionette.set_context(self.executor.protocol.marionette.CONTEXT_CHROME)
+        self.logger.debug(f"Starting internal reftests with {data}")
         self.executor.protocol.marionette._send_message("reftest:setup", data)
 
     def reset(self, **kwargs):
@@ -1357,7 +1362,7 @@ class MarionettePrintRefTestExecutor(MarionetteRefTestExecutor):
                  screenshot_cache=None, close_after_done=True,
                  debug_info=None, reftest_screenshot="unexpected", ccov=False,
                  group_metadata=None, capabilities=None, debug=False,
-                 reftest_internal=False, **kwargs):
+                 reftest_internal=False, cache_screenshots=True, **kwargs):
         """Marionette-based executor for reftests"""
         MarionetteRefTestExecutor.__init__(self,
                                            logger,
@@ -1373,6 +1378,7 @@ class MarionettePrintRefTestExecutor(MarionetteRefTestExecutor):
                                            group_metadata=group_metadata,
                                            capabilities=capabilities,
                                            debug=debug,
+                                           cache_screenshots=cache_screenshots,
                                            **kwargs)
 
     def setup(self, runner, protocol=None):
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
index 81e9d509bf4..0b641e29d08 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
@@ -381,6 +381,12 @@ scheme host and port.""")
         help=("Reuse a window across `testharness.js` tests where possible, "
               "which can speed up testing. Also useful for ensuring that the "
               "renderer process has a stable PID for a debugger to attach to."))
+    chrome_group.add_argument(
+        "--trace-categories",
+        metavar="CATEGORIES",
+        nargs="?",
+        const="blink,blink.bindings",
+        help="Record traces under the given categories for each test.")
 
     sauce_group = parser.add_argument_group("Sauce Labs-specific")
     sauce_group.add_argument("--sauce-browser", help="Sauce Labs browser name")
diff --git a/tests/wpt/tests/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html b/tests/wpt/tests/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html
index a920f5240d7..bb9bbd39b63 100644
--- a/tests/wpt/tests/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html
+++ b/tests/wpt/tests/trusted-types/should-sink-type-mismatch-violation-be-blocked-by-csp-001.html
@@ -104,10 +104,10 @@ header(Content-Security-Policy-Report-Only,require-trusted-types-for 'script',Tr
   // per the spec's ABNF:
   // https://www.w3.org/TR/trusted-types/#require-trusted-types-for-csp-directive
   // https://w3c.github.io/webappsec-csp/#grammardef-required-ascii-whitespace
-  // U+00A LF breaks the header field value into two lines so make sure that
-  // "the continuation line begins with a space or horizontal tab" in accordance
-  // with https://www.rfc-editor.org/rfc/rfc2616
-  ["%09", "%0A%20", "%0C", "%0D", "%20"].forEach(whitespace => {
+  // U+00A and U+00D LF break the header field value into two lines so make sure
+  // that "the continuation line begins with a space or horizontal tab" in
+  // accordance with https://www.rfc-editor.org/rfc/rfc2616
+  ["%09", "%0A%20", "%0C", "%0D%20", "%20"].forEach(whitespace => {
     let directive = `require-trusted-types-for 'invalid'${whitespace}'script'`;
     promise_test(async t => {
       let results = await trySendingPlainStringToTrustedTypeSink(
diff --git a/tests/wpt/tests/trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-002.html b/tests/wpt/tests/trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-002.html
index abf24276372..d299b6648ef 100644
--- a/tests/wpt/tests/trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-002.html
+++ b/tests/wpt/tests/trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-002.html
@@ -91,13 +91,13 @@
   // ABNF:
   // https://w3c.github.io/trusted-types/dist/spec/#serialized-tt-configuration
   // https://w3c.github.io/webappsec-csp/#grammardef-required-ascii-whitespace
-  // U+00A LF breaks the header field value into two lines so make sure that
-  // "the continuation line begins with a space or horizontal tab" in accordance
-  // with https://www.rfc-editor.org/rfc/rfc2616
+  // U+00A / U+00D LF breaks the header field value into two lines so make sure
+  // that "the continuation line begins with a space or horizontal tab" in
+  // accordance with https://www.rfc-editor.org/rfc/rfc2616
   promise_test(async t => {
     let results = await tryCreatingTrustedTypePoliciesWithCSP(
       ["_TTP1_", "_TTP2_", "_TTP3_", "_TTP4_", "_TTP5_", "_TTP6_"],
-      "header(Content-Security-Policy,trusted-types _TTP1_%09_TTP2_%0A%20_TTP3_%0C_TTP4_%0D_TTP5_%20_TTP6_,True)"
+      "header(Content-Security-Policy,trusted-types _TTP1_%09_TTP2_%0A%20_TTP3_%0C_TTP4_%0D%20_TTP5_%20_TTP6_,True)"
     );
     assert_equals(results.length, 6);
     results.forEach((result, index) => {
diff --git a/tests/wpt/tests/urlpattern/resources/urlpatterntestdata.json b/tests/wpt/tests/urlpattern/resources/urlpatterntestdata.json
index a613b6a74b5..363ec15f2b2 100644
--- a/tests/wpt/tests/urlpattern/resources/urlpatterntestdata.json
+++ b/tests/wpt/tests/urlpattern/resources/urlpatterntestdata.json
@@ -2991,5 +2991,47 @@
     "pattern": [{ "pathname": "/([\\d&&[0-1]])" }],
     "inputs": [{ "pathname": "/3" }],
     "expected_match": null
+  },
+  {
+    "pattern": [{ "protocol": "http", "hostname": "example.com/ignoredpath" }],
+    "inputs": ["http://example.com/"],
+    "expected_obj": {
+      "protocol": "http",
+      "hostname": "example.com",
+      "pathname": "*"
+    },
+    "expected_match": {
+      "protocol": { "input": "http", "groups": {} },
+      "hostname": { "input": "example.com", "groups": {} },
+      "pathname": { "input": "/", "groups": { "0": "/" } }
+    }
+  },
+  {
+    "pattern": [{ "protocol": "http", "hostname": "example.com\\?ignoredsearch" }],
+    "inputs": ["http://example.com/"],
+    "expected_obj": {
+      "protocol": "http",
+      "hostname": "example.com",
+      "search": "*"
+    },
+    "expected_match": {
+      "protocol": { "input": "http", "groups": {} },
+      "hostname": { "input": "example.com", "groups": {} },
+      "pathname": { "input": "/", "groups": { "0": "/" } }
+    }
+  },
+  {
+    "pattern": [{ "protocol": "http", "hostname": "example.com#ignoredhash" }],
+    "inputs": ["http://example.com/"],
+    "expected_obj": {
+      "protocol": "http",
+      "hostname": "example.com",
+      "hash": "*"
+    },
+    "expected_match": {
+      "protocol": { "input": "http", "groups": {} },
+      "hostname": { "input": "example.com", "groups": {} },
+      "pathname": { "input": "/", "groups": { "0": "/" } }
+    }
   }
 ]
diff --git a/tests/wpt/tests/web-animations/responsive/toggle-animated-iframe-visibility.html b/tests/wpt/tests/web-animations/responsive/toggle-animated-iframe-visibility.html
index df1287d40be..f50ffaad347 100644
--- a/tests/wpt/tests/web-animations/responsive/toggle-animated-iframe-visibility.html
+++ b/tests/wpt/tests/web-animations/responsive/toggle-animated-iframe-visibility.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html class="reftest-wait">
 <meta name="assert" content="This should resume the animation after unhiding the iframe.">
-<meta name="fuzzy" content="0-25;0-50">
 <title>CSS Test (Animations): Unhiding iframe visibility should restart animation. </title>
 <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=616270">
 <link rel="match" href="toggle-animated-iframe-visibility-ref.html">
diff --git a/tests/wpt/tests/webaudio/resources/audit-util.js b/tests/wpt/tests/webaudio/resources/audit-util.js
index 4e574a64b1a..422c8f4678c 100644
--- a/tests/wpt/tests/webaudio/resources/audit-util.js
+++ b/tests/wpt/tests/webaudio/resources/audit-util.js
@@ -239,14 +239,6 @@ function assert_array_equals_exact(actual, expected, message) {
  * @param {!Array<number>} array The array to be checked.
  * @param {number} constantValue The constant value to compare against.
  * @param {string} message Description used for assertion failures.
- * Asserts that not all values in the given array are equal to the
- * specified constant. This is useful for verifying that an output
- * signal is not silent or uniform.
- *
- * @param {!Array<number>} array - The array of numbers to check.
- * @param {number} constantValue - The value that not all array elements
- * should match.
- * @param {string} message - Description used for assertion failure messages.
  */
 function assert_not_constant_value(array, constantValue, message) {
   const notAllSame = array.some(value => value !== constantValue);
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-playbackrate-zero.html b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-playbackrate-zero.html
index 5624054e328..c8bcbb61dd0 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-playbackrate-zero.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-playbackrate-zero.html
@@ -1,33 +1,27 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>
-      audiobuffersource-playbackrate-zero.html
-    </title>
+    <title>audiobuffersource-playbackrate-zero.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">
+    <script>
       // Sample rate should be power of 128 to observe the change of AudioParam
       // at the beginning of rendering quantum. (playbackRate is k-rate) This is
       // the minimum sample rate in the valid sample rate range.
-      let sampleRate = 8192;
+      const sampleRate = 8192;
 
       // The render duration in seconds, and the length in samples.
-      let renderDuration = 1.0;
-      let renderLength = renderDuration * sampleRate;
+      const renderDuration = 1.0;
+      const renderLength = renderDuration * sampleRate;
 
-      let context = new OfflineAudioContext(1, renderLength, sampleRate);
-      let audit = Audit.createTaskRunner();
+      const context = new OfflineAudioContext(1, renderLength, sampleRate);
 
-
-      // Task: Render the actual buffer and compare with the reference.
-      audit.define('synthesize-verify', (task, should) => {
-        let ramp = context.createBufferSource();
-        let rampBuffer = createLinearRampBuffer(context, renderLength);
+      promise_test(async t => {
+        const ramp = new AudioBufferSourceNode(context);
+        const rampBuffer = createLinearRampBuffer(context, renderLength);
         ramp.buffer = rampBuffer;
 
         ramp.connect(context.destination);
@@ -39,78 +33,78 @@
         ramp.playbackRate.setValueAtTime(1.0, 0.0);
         ramp.playbackRate.setValueAtTime(0.0, renderDuration / 2);
 
-        context.startRendering()
-            .then(function(renderedBuffer) {
-              let data = renderedBuffer.getChannelData(0);
-              let rampData = rampBuffer.getChannelData(0);
-              let half = rampData.length / 2;
-              let passed = true;
-              let i;
+        const renderedBuffer = await context.startRendering();
 
-              for (i = 1; i < rampData.length; i++) {
-                if (i < half) {
-                  // Before the half position, the actual should match with the
-                  // original ramp data.
-                  if (data[i] !== rampData[i]) {
-                    passed = false;
-                    break;
-                  }
-                } else {
-                  // From the half position, the actual value should not change.
-                  if (data[i] !== rampData[half]) {
-                    passed = false;
-                    break;
-                  }
-                }
-              }
+        const data = renderedBuffer.getChannelData(0);
+        const rampData = rampBuffer.getChannelData(0);
+        const half = rampData.length / 2;
 
-              should(passed, 'The zero playbackRate')
-                  .message(
-                      'held the sample value correctly',
-                      'should hold the sample value. ' +
-                          'Expected ' + rampData[half] + ' but got ' + data[i] +
-                          ' at the index ' + i);
-            })
-            .then(() => task.done());
-      });
+        let passed = true;
+        let i;
+
+        for (i = 1; i < rampData.length; i++) {
+          if (i < half) {
+            if (data[i] !== rampData[i]) {
+              passed = false;
+              break;
+            }
+          } else {
+            if (data[i] !== rampData[half]) {
+              passed = false;
+              break;
+            }
+          }
+        }
+
+        assert_true(
+            passed,
+            `The zero playbackRate should hold the sample value. Expected` +
+                `${rampData[half]} but got ${data[i]} at index ${i}`);
+      }, 'Synthesize and verify sample-and-hold behavior when playbackRate ' +
+          'is set to zero halfway');
+
+      promise_test(async t => {
+        const context = new OfflineAudioContext(1, renderLength, sampleRate);
+        const rampBuffer = new AudioBuffer({
+          length: renderLength,
+          sampleRate: context.sampleRate
+        });
+
+        const data = new Float32Array(renderLength);
+        const startValue = 5;
 
-      audit.define('subsample start with playback rate 0', (task, should) => {
-        let context = new OfflineAudioContext(1, renderLength, sampleRate);
-        let rampBuffer = new AudioBuffer(
-            {length: renderLength, sampleRate: context.sampleRate});
-        let data = new Float32Array(renderLength);
-        let startValue = 5;
         for (let k = 0; k < data.length; ++k) {
           data[k] = k + startValue;
         }
+
         rampBuffer.copyToChannel(data, 0);
 
-        let src = new AudioBufferSourceNode(
-            context, {buffer: rampBuffer, playbackRate: 0});
+        const src = new AudioBufferSourceNode(context, {
+          buffer: rampBuffer,
+          playbackRate: 0
+        });
 
         src.connect(context.destination);
 
         // Purposely start the source between frame boundaries
-        let startFrame = 27.3;
+        const startFrame = 27.3;
         src.start(startFrame / context.sampleRate);
 
-        context.startRendering()
-            .then(audioBuffer => {
-              let actualStartFrame = Math.ceil(startFrame);
-              let audio = audioBuffer.getChannelData(0);
+        const audioBuffer = await context.startRendering();
+        const actualStartFrame = Math.ceil(startFrame);
+        const audio = audioBuffer.getChannelData(0);
 
-              should(
-                  audio.slice(0, actualStartFrame),
-                  `output[0:${actualStartFrame - 1}]`)
-                  .beConstantValueOf(0);
-              should(
-                  audio.slice(actualStartFrame), `output[${actualStartFrame}:]`)
-                  .beConstantValueOf(startValue);
-            })
-            .then(() => task.done());
-      });
-
-      audit.run();
+        assert_constant_value(
+            audio.slice(0, actualStartFrame),
+            0,
+            'output before startFrame should be silence: ');
+        assert_constant_value(
+            audio.slice(actualStartFrame),
+            startValue,
+            `output after startFrame (starting at index ${actualStartFrame}) ` +
+                `should match start value: `);
+      }, 'Subsample start with playbackRate 0 should produce sample-and-hold ' +
+          'from exact start frame');
     </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 3700bfa8ce8..7b6fbf19775 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
@@ -7,81 +7,77 @@
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
     <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
   </head>
   <body>
     <script>
-      let audit = Audit.createTaskRunner();
 
-      audit.define(
-          {
-            label: 'buffer-stitching-1',
-            description: 'Subsample buffer stitching, same rates'
-          },
-          (task, should) => {
-            const sampleRate = 44100;
-            const bufferRate = 44100;
-            const bufferLength = 30;
+      promise_test(async t => {
+        // Sub‑sample stitching with identical context/buffer rates.
+        const sampleRate = 44100;
+        const bufferRate = 44100;
+        const bufferLength = 30;
 
-            // Experimentally determined thresholds.  DO NOT relax these values
-            // to far from these values to make the tests pass.
-            const errorThreshold = 9.0957e-5;
-            const snrThreshold = 85.580;
+        // Experimentally determined thresholds. DO NOT relax these values
+        // too far from these values to make the tests pass.
+        const errorThreshold = 9.0957e-5;
+        const snrThreshold = 85.580;
 
-            // Informative message
-            should(sampleRate, 'Test 1: context.sampleRate')
-                .beEqualTo(sampleRate);
-            testBufferStitching(sampleRate, bufferRate, bufferLength)
-                .then(resultBuffer => {
-                  const actual = resultBuffer.getChannelData(0);
-                  const expected = resultBuffer.getChannelData(1);
-                  should(
-                      actual,
-                      `Stitched sine-wave buffers at sample rate ${bufferRate}`)
-                      .beCloseToArray(
-                          expected, {absoluteThreshold: errorThreshold});
-                  const SNR = 10 * Math.log10(computeSNR(actual, expected));
-                  should(SNR, `SNR (${SNR} dB)`)
-                      .beGreaterThanOrEqualTo(snrThreshold);
-                })
-                .then(() => task.done());
-          });
+        assert_equals(sampleRate, 44100, 'Test 1: context.sampleRate');
 
-      audit.define(
-          {
-            label: 'buffer-stitching-2',
-            description: 'Subsample buffer stitching, different rates'
-          },
-          (task, should) => {
-            const sampleRate = 44100;
-            const bufferRate = 43800;
-            const bufferLength = 30;
+        const resultBuffer =
+            await testBufferStitching(sampleRate, bufferRate, bufferLength);
 
-            // Experimentally determined thresholds.  DO NOT relax these values
-            // to far from these values to make the tests pass.
-            const errorThreshold = 3.8986e-3;
-            const snrThreshold = 65.737;
+        const actual = resultBuffer.getChannelData(0);
+        const expected = resultBuffer.getChannelData(1);
 
-            // Informative message
-            should(sampleRate, 'Test 2: context.sampleRate')
-                .beEqualTo(sampleRate);
-            testBufferStitching(sampleRate, bufferRate, bufferLength)
-                .then(resultBuffer => {
-                  const actual = resultBuffer.getChannelData(0);
-                  const expected = resultBuffer.getChannelData(1);
-                  should(
-                      actual,
-                      `Stitched sine-wave buffers at sample rate ${bufferRate}`)
-                      .beCloseToArray(
-                          expected, {absoluteThreshold: errorThreshold});
-                  const SNR = 10 * Math.log10(computeSNR(actual, expected));
-                  should(SNR, `SNR (${SNR} dB)`)
-                      .beGreaterThanOrEqualTo(snrThreshold);
-                })
-                .then(() => task.done());
-          });
+        assert_array_approximately_equals(
+            actual,
+            expected,
+            errorThreshold,
+            `Stitched sine‑wave buffers at sample rate ${bufferRate}`);
 
-      audit.run();
+        const SNR = 10 * Math.log10(computeSNR(actual, expected));
+
+        assert_greater_than_equal(
+            SNR,
+            snrThreshold,
+            `SNR (${SNR.toFixed(3)} dB) should be ≥ ${snrThreshold} dB`);
+      }, 'buffer-stitching-1');
+
+      promise_test(async t => {
+        // Sub‑sample stitching with differing context/buffer rates.
+        const sampleRate = 44100;
+        const bufferRate = 43800;
+        const bufferLength = 30;
+
+        // Experimentally determined thresholds. DO NOT relax these values
+        // too far from these values to make the tests pass.
+        const errorThreshold = 3.8986e-3;
+        const snrThreshold = 65.737;
+
+        assert_equals(sampleRate, 44100, 'Test 2: context.sampleRate');
+
+        const resultBuffer = await testBufferStitching(
+            sampleRate,
+            bufferRate,
+            bufferLength);
+
+        const actual = resultBuffer.getChannelData(0);
+        const expected = resultBuffer.getChannelData(1);
+
+        assert_array_approximately_equals(
+            actual,
+            expected,
+            errorThreshold,
+            `Stitched sine‑wave buffers at sample rate ${bufferRate}`);
+
+        const SNR = 10 * Math.log10(computeSNR(actual, expected));
+
+        assert_greater_than_equal(
+            SNR,
+            snrThreshold,
+            `SNR (${SNR.toFixed(3)} dB) should be ≥ ${snrThreshold} dB`);
+      }, 'buffer-stitching-2');
 
       // Create graph to test stitching of consecutive ABSNs.  The context rate
       // is |sampleRate|, and the buffers have a fixed length of |bufferLength|
@@ -89,25 +85,27 @@
       // from |sampleRate| because of interpolation of the buffer to the context
       // rate.
       function testBufferStitching(sampleRate, bufferRate, bufferLength) {
-        // The context for testing.  Channel 0 contains the output from
-        // stitching all the buffers together, and channel 1 contains the
-        // expected output.
-        const context = new OfflineAudioContext(
-            {numberOfChannels: 2, length: sampleRate, sampleRate: sampleRate});
+        // The OfflineAudioContext used for rendering.
+        // Channel 0 captures the stitched output.
+        // Channel 1 records the expected reference signal.
+        const context = new OfflineAudioContext({
+          numberOfChannels: 2,
+          length: sampleRate,
+          sampleRate: sampleRate,
+        });
 
         const merger = new ChannelMergerNode(
             context, {numberOfInputs: context.destination.channelCount});
-
         merger.connect(context.destination);
 
-        // The reference is a sine wave at 440 Hz.
+        // Reference signal (channel 1): pure 440 Hz sine wave
         const ref = new OscillatorNode(context, {frequency: 440, type: 'sine'});
         ref.connect(merger, 0, 1);
         ref.start();
 
         // The test signal is a bunch of short AudioBufferSources containing
         // bits of a sine wave.
-        let waveSignal = new Float32Array(context.length);
+        const waveSignal = new Float32Array(context.length);
         const omega = 2 * Math.PI / bufferRate * ref.frequency.value;
         for (let k = 0; k < context.length; ++k) {
           waveSignal[k] = Math.sin(omega * k);
@@ -119,6 +117,8 @@
         for (let k = 0; k < context.length; k += bufferLength) {
           const buffer =
               new AudioBuffer({length: bufferLength, sampleRate: bufferRate});
+
+          // Copy the slice into the AudioBuffer’s first (and only) channel.
           buffer.copyToChannel(waveSignal.slice(k, k + bufferLength), 0);
 
           const src = new AudioBufferSourceNode(context, {buffer: buffer});
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html b/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html
index 0d6b45c56df..5040a96ec5d 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-channelmergernode-interface/ctor-channelmerger.html
@@ -7,106 +7,81 @@
     <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/audionodeoptions.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
+    <script>
       let context;
 
-      let audit = Audit.createTaskRunner();
+      test(() => {
+        context = new OfflineAudioContext(1, 1, 48000);
+      }, 'Initialize AudioContext for ChannelMergerNode tests');
 
-      audit.define('initialize', (task, should) => {
-        context = initializeContext(should);
-        task.done();
-      });
+      test(() => {
+        testInvalidConstructor_W3CTH('ChannelMergerNode', context);
+      }, 'Invalid constructor behavior for ChannelMergerNode');
 
-      audit.define('invalid constructor', (task, should) => {
-        testInvalidConstructor(should, 'ChannelMergerNode', context);
-        task.done();
-      });
-
-      audit.define('default constructor', (task, should) => {
-        let prefix = 'node0';
-        let node =
-            testDefaultConstructor(should, 'ChannelMergerNode', context, {
+      test(() => {
+        const prefix = 'node0';
+        const node =
+            testDefaultConstructor_W3CTH('ChannelMergerNode', context, {
               prefix: prefix,
               numberOfInputs: 6,
               numberOfOutputs: 1,
               channelCount: 1,
               channelCountMode: 'explicit',
-              channelInterpretation: 'speakers'
+              channelInterpretation: 'speakers',
             });
+      }, 'Default constructor behavior for ChannelMergerNode');
 
-        task.done();
-      });
-
-      audit.define('test AudioNodeOptions', (task, should) => {
-        testAudioNodeOptions(should, context, 'ChannelMergerNode', {
+      test(() => {
+        testAudioNodeOptions_W3CTH(context, 'ChannelMergerNode', {
           channelCount: {
             value: 1,
             isFixed: true,
-            exceptionType: 'InvalidStateError'
+            exceptionType: 'InvalidStateError',
           },
           channelCountMode: {
             value: 'explicit',
             isFixed: true,
-            exceptionType: 'InvalidStateError'
-          }
+            exceptionType: 'InvalidStateError',
+          },
         });
-        task.done();
-      });
+      }, 'AudioNodeOptions behavior for ChannelMergerNode');
 
-      audit.define('constructor options', (task, should) => {
+      test(() => {
         let node;
         let options = {
           numberOfInputs: 3,
           numberOfOutputs: 9,
-          channelInterpretation: 'discrete'
+          channelInterpretation: 'discrete',
         };
 
-        should(
-            () => {
-              node = new ChannelMergerNode(context, options);
-            },
-            'node1 = new ChannelMergerNode(context, ' +
-                JSON.stringify(options) + ')')
-            .notThrow();
+        node = new ChannelMergerNode(context, options);
 
-        should(node.numberOfInputs, 'node1.numberOfInputs')
-            .beEqualTo(options.numberOfInputs);
-        should(node.numberOfOutputs, 'node1.numberOfOutputs').beEqualTo(1);
-        should(node.channelInterpretation, 'node1.channelInterpretation')
-            .beEqualTo(options.channelInterpretation);
+        assert_equals(
+            node.numberOfInputs, options.numberOfInputs,
+            'node1.numberOfInputs');
+        assert_equals(node.numberOfOutputs, 1, 'node1.numberOfOutputs');
+        assert_equals(
+            node.channelInterpretation, options.channelInterpretation,
+            'node1.channelInterpretation');
 
         options = {numberOfInputs: 99};
-        should(
-            () => {
-              node = new ChannelMergerNode(context, options);
-            },
-            'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')')
-            .throw(DOMException, 'IndexSizeError');
+        assert_throws_dom('IndexSizeError', () => {
+          node = new ChannelMergerNode(context, options);
+        }, 'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')');
 
         options = {channelCount: 3};
-        should(
-            () => {
-              node = new ChannelMergerNode(context, options);
-            },
-            'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')')
-            .throw(DOMException, 'InvalidStateError');
+        assert_throws_dom('InvalidStateError', () => {
+          node = new ChannelMergerNode(context, options);
+        }, 'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')');
 
         options = {channelCountMode: 'max'};
-        should(
-            () => {
-              node = new ChannelMergerNode(context, options);
-            },
-            'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')')
-            .throw(DOMException, 'InvalidStateError');
-
-        task.done();
-      });
-
-      audit.run();
+        assert_throws_dom('InvalidStateError', () => {
+          node = new ChannelMergerNode(context, options);
+        }, 'new ChannelMergerNode(c, ' + JSON.stringify(options) + ')');
+      }, 'Constructor options validation for ChannelMergerNode');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html b/tests/wpt/tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html
index 6326d00dfb7..f6bb8299b2a 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-gainnode-interface/no-dezippering.html
@@ -7,82 +7,68 @@
     <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>
+      promise_test(
+          () => testWithAutomation({prefix: ''}),
+          'Compare value setter and setValueAtTime');
 
-      audit.define(
-          {label: 'test0', description: 'Dezippering of GainNode removed'},
-          (task, should) => {
-            // Only need a few frames to verify that dezippering has been
-            // removed from the GainNode.  Sample rate is pretty arbitrary.
-            let context = new OfflineAudioContext(1, 1024, 16000);
+      promise_test(
+          () => testWithAutomation({
+            prefix: 'With modulation: ',
+            modulator: true
+          }),
+          'Automation effects');
 
-            // Send a unit source to the gain node so we can measure the effect
-            // of the gain node.
-            let src = new ConstantSourceNode(context, {offset: 1});
-            let g = new GainNode(context, {gain: 1});
-            src.connect(g).connect(context.destination);
+      promise_test(async () => {
+        // Only need a few frames to verify that dezippering has been
+        // removed from the GainNode.  Sample rate is pretty arbitrary.
+        const context = new OfflineAudioContext(1, 1024, 16000);
 
-            context.suspend(RENDER_QUANTUM_FRAMES / context.sampleRate)
-                .then(() => {
-                  g.gain.value = .5;
-                })
-                .then(() => context.resume());
+        // Send a unit source to the gain node so we can measure the effect
+        // of the gain node.
+        const src = new ConstantSourceNode(context, {offset: 1});
+        const g = new GainNode(context, {gain: 1});
+        src.connect(g).connect(context.destination);
 
-            src.start();
+        // Schedule the suspend but DON’T await it here
+        context
+            .suspend(RENDER_QUANTUM_FRAMES / context.sampleRate)
+            .then(() => {
+              g.gain.value = 0.5;
+              return context.resume();
+            });
 
-            context.startRendering()
-                .then(audio => {
-                  let c = audio.getChannelData(0);
+        src.start();
 
-                  // If dezippering has been removed, the gain output should
-                  // instantly jump at frame 128 to 0.5.
-                  should(c.slice(0, 128), 'output[0:127]').beConstantValueOf(1);
-                  should(c.slice(128), 'output[128:]').beConstantValueOf(0.5);
-                })
-                .then(() => task.done());
-          });
+        // Now start rendering and wait for it to finish
+        const audio = await context.startRendering();
+        const c = audio.getChannelData(0);
 
-      audit.define(
-          {
-            label: 'test2',
-            description: 'Compare value setter and setValueAtTime'
-          },
-          (task, should) => {
-            testWithAutomation(should, {prefix: ''}).then(() => task.done());
-          });
+        // If dezippering has been removed, the gain output should
+        // instantly jump at frame 128 to 0.5.
+        assert_constant_value(c.slice(0, 128), 1, 'output[0:127]');
+        assert_constant_value(c.slice(128), 0.5, 'output[128:]');
+      }, 'Dezippering of GainNode removed');
 
-      audit.define(
-          {label: 'test3', description: 'Automation effects'},
-          (task, should) => {
-            testWithAutomation(should, {
-              prefix: 'With modulation: ',
-              modulator: true
-            }).then(() => task.done());
-          });
-
-      audit.run();
-
-      function testWithAutomation(should, options) {
+      async function testWithAutomation(options) {
         // Sample rate must be a power of two to eliminate round-off in
         // computing the time at render quantum boundaries.
-        let context = new OfflineAudioContext(2, 1024, 16384);
-        let merger = new ChannelMergerNode(context, {numberOfChannels: 2});
+        const context = new OfflineAudioContext(2, 1024, 16384);
+        const merger = new ChannelMergerNode(context, {numberOfChannels: 2});
         merger.connect(context.destination);
 
-        let src = new OscillatorNode(context);
-        let gainTest = new GainNode(context);
-        let gainRef = new GainNode(context);
+        const src = new OscillatorNode(context);
+        const gainTest = new GainNode(context);
+        const gainRef = new GainNode(context);
 
         src.connect(gainTest).connect(merger, 0, 0);
         src.connect(gainRef).connect(merger, 0, 1);
 
         if (options.modulator) {
-          let mod = new OscillatorNode(context, {frequency: 1000});
-          let modGain = new GainNode(context);
+          const mod = new OscillatorNode(context, {frequency: 1000});
+          const modGain = new GainNode(context);
           mod.connect(modGain);
           modGain.connect(gainTest.gain);
           modGain.connect(gainRef.gain);
@@ -90,32 +76,30 @@
         }
 
         // Change the gains. Must do the change on a render boundary!
-        let changeTime = 3 * RENDER_QUANTUM_FRAMES / context.sampleRate;
-        let newGain = .3;
+        const changeTime = 3 * RENDER_QUANTUM_FRAMES / context.sampleRate;
+        const newGain = 0.3;
 
         gainRef.gain.setValueAtTime(newGain, changeTime);
-        context.suspend(changeTime)
-            .then(() => gainTest.gain.value = newGain)
-            .then(() => context.resume());
+        context
+            .suspend(changeTime)
+            .then(() => {
+              gainTest.gain.value = newGain;
+              return context.resume();
+            });
 
         src.start();
 
-        return context.startRendering().then(audio => {
-          let actual = audio.getChannelData(0);
-          let expected = audio.getChannelData(1);
+        const audio = await context.startRendering();
+        const actual = audio.getChannelData(0);
+        const expected = audio.getChannelData(1);
 
-          // The values using the .value setter must be identical to the
-          // values using setValueAtTime.
-          let match = should(actual, options.prefix + '.value setter output')
-                          .beEqualToArray(expected);
-
-          should(
-              match,
-              options.prefix +
-                  '.value setter output matches setValueAtTime output')
-              .beTrue();
-        });
+        // The values using the .value setter must be identical to the
+        // values using setValueAtTime.
+        assert_array_equals(
+            actual, expected,
+            options.prefix + '.value setter output matches setValueAtTime');
       }
+
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html
index 13e88be567b..9ac196a27aa 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper-limits.html
@@ -7,32 +7,29 @@
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
     <script src="../../resources/audit-util.js"></script>
-    <script src="../../resources/audit.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
-      let audit = Audit.createTaskRunner();
-
+    <script>
       let context;
       let bufferData;
       let outputData;
       let reference;
 
-      let sampleRate = 48000;
+      const sampleRate = 48000;
       // Must be odd so we have an exact middle point.
-      let testFrames = 23;
-      let scale = 1 / ((testFrames - 1) / 2 - 1);
+      const testFrames = 23;
+      const scale = 1 / ((testFrames - 1) / 2 - 1);
       // Number of decimal digits to print
-      let decimals = 6;
+      const decimals = 6;
       // Required accuracy
-      let diffThreshold = Math.pow(10, -decimals);
+      const diffThreshold = Math.pow(10, -decimals);
 
       // Generate reference data
-      function generateReference() {
+      const generateReference = () => {
         // The curve data is 0, 1, 0, and the input data is a ramp from -1+eps
         // to 1+eps.  Then the output is a ramp from 0 to 1 back to 0.
-        let ref = new Float32Array(testFrames);
-        let midPoint = (testFrames - 1) / 2;
+        const ref = new Float32Array(testFrames);
+        const midPoint = (testFrames - 1) / 2;
         // First sample is below -1 at -1-scale.
         ref[0] = 0;
         // Generate ramp up to the mid-point
@@ -48,63 +45,52 @@
         // The last sample is out of range at 1+scale
         ref[testFrames - 1] = 0;
         return ref;
-      }
+      };
 
-      function checkResult(renderedBuffer, should) {
+      const checkResult = renderedBuffer => {
         outputData = renderedBuffer.getChannelData(0);
         reference = generateReference();
-        let success = true;
-        // Verify that every output value matches our expected reference value.
         for (let k = 0; k < outputData.length; ++k) {
-          let diff = outputData[k] - reference[k];
-          should(
+          const diff = outputData[k] - reference[k];
+          assert_less_than_equal(
               Math.abs(diff),
-              'Max error mapping ' + bufferData[k].toFixed(decimals) + ' to ' +
-                  outputData[k].toFixed(decimals))
-              .beLessThanOrEqualTo(diffThreshold);
+              diffThreshold,
+              `Max error mapping ${bufferData[k].toFixed(decimals)} to ` +
+                  `${outputData[k].toFixed(decimals)}`);
         }
-      }
+      };
 
-      audit.define(
-          {
-            label: 'test',
-            description:
-                'WaveShaperNode including values outside the range of [-1,1]'
-          },
-          function(task, should) {
-            context = new OfflineAudioContext(1, testFrames, sampleRate);
-            // Create input values between -1.1 and 1.1
-            let buffer =
-                context.createBuffer(1, testFrames, context.sampleRate);
-            bufferData = new Float32Array(testFrames);
-            let start = -1 - scale;
-            for (let k = 0; k < testFrames; ++k) {
-              bufferData[k] = k * scale + start;
-            }
-            buffer.copyToChannel(bufferData, 0);
+      promise_test(async t => {
+        context = new OfflineAudioContext(1, testFrames, sampleRate);
+        // Create input values between -1.1 and 1.1
+        const buffer = new AudioBuffer({ length: testFrames,
+            numberOfChannels: 1, sampleRate: context.sampleRate });
+        bufferData = new Float32Array(testFrames);
+        const start = -1 - scale;
+        for (let k = 0; k < testFrames; ++k) {
+          bufferData[k] = k * scale + start;
+        }
+        buffer.copyToChannel(bufferData, 0);
 
-            let source = context.createBufferSource();
-            source.buffer = buffer;
+        const source = new AudioBufferSourceNode(context, { buffer });
 
-            // Create simple waveshaper. It should map -1 to 0, 0 to 1, and +1
-            // to 0 and interpolate all points in between using a simple linear
-            // interpolator.
-            let shaper = context.createWaveShaper();
-            let curve = new Float32Array(3);
-            curve[0] = 0;
-            curve[1] = 1;
-            curve[2] = 0;
-            shaper.curve = curve;
-            source.connect(shaper);
-            shaper.connect(context.destination);
+        // Create simple waveshaper. It should map -1 to 0, 0 to 1, and +1
+        // to 0 and interpolate all points in between using a simple linear
+        // interpolator.
+        const curve = new Float32Array(3);
+        curve[0] = 0;
+        curve[1] = 1;
+        curve[2] = 0;
 
-            source.start();
-            context.startRendering()
-                .then(buffer => checkResult(buffer, should))
-                .then(() => task.done());
-          });
+        const shaper = new WaveShaperNode(context, { curve });
+        source.connect(shaper);
+        shaper.connect(context.destination);
 
-      audit.run();
+        source.start();
+        const renderedBuffer = await context.startRendering();
+        checkResult(renderedBuffer);
+      }, 'WaveShaperNode maps input values outside [-1,1] according to curve' +
+          ' and clamps output correctly');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html
index 5e6ed24e9ea..d0725f4b7a7 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-waveshapernode-interface/waveshaper.html
@@ -6,34 +6,34 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="../../resources/audit-util.js"></script>
-    <script src="../../resources/audit.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
-      let audit = Audit.createTaskRunner();
+    <script>
 
-      let sampleRate = 44100;
-      let lengthInSeconds = 4;
-      let numberOfRenderFrames = sampleRate * lengthInSeconds;
-      let numberOfCurveFrames = 65536;
+      const sampleRate = 44100;
+      const lengthInSeconds = 4;
+      const numberOfRenderFrames = sampleRate * lengthInSeconds;
+      const numberOfCurveFrames = 65536;
+
+      let context;
       let inputBuffer;
       let waveShapingCurve;
 
-      let context;
-
       function generateInputBuffer() {
         // Create mono input buffer.
-        let buffer =
-            context.createBuffer(1, numberOfRenderFrames, context.sampleRate);
-        let data = buffer.getChannelData(0);
+        const buffer = new AudioBuffer({
+          length: numberOfRenderFrames,
+          numberOfChannels: 1,
+          sampleRate: context.sampleRate
+        });
+        const data = buffer.getChannelData(0);
 
         // Generate an input vector with values from -1 -> +1 over a duration of
         // lengthInSeconds. This exercises the full nominal input range and will
         // touch every point of the shaping curve.
         for (let i = 0; i < numberOfRenderFrames; ++i) {
-          let x = i / numberOfRenderFrames;  // 0 -> 1
-          x = 2 * x - 1;                     // -1 -> +1
+          let x = i / numberOfRenderFrames;
+          x = 2 * x - 1;
           data[i] = x;
         }
 
@@ -46,62 +46,72 @@
       // To some extent, the actual curve we choose is not important in this
       // test, since the input vector walks through all possible curve values.
       function generateWaveShapingCurve() {
-        let curve = new Float32Array(numberOfCurveFrames);
-
-        let n = numberOfCurveFrames;
-        let n2 = n / 2;
+        const curve = new Float32Array(numberOfCurveFrames);
+        const n = numberOfCurveFrames;
+        const n2 = n / 2;
 
         for (let i = 0; i < n; ++i) {
-          let x = (i - n2) / n2;
-          let y = Math.atan(5 * x) / (0.5 * Math.PI);
+          const x = (i - n2) / n2;
+          curve[i] = Math.atan(5 * x) / (0.5 * Math.PI);
         }
-
         return curve;
       }
+      // Following spec algorithm from
+      // https://webaudio.github.io/web-audio-api/#WaveShaperNode-attributes
+      function checkShapedCurve(buffer) {
+        const inputData = inputBuffer.getChannelData(0);
+        const outputData = buffer.getChannelData(0);
+        const c = waveShapingCurve;
+        const N = numberOfCurveFrames;
+        const tolerance = 1e-6;
 
-      function checkShapedCurve(buffer, should) {
-        let inputData = inputBuffer.getChannelData(0);
-        let outputData = buffer.getChannelData(0);
-
-        let success = true;
+        let firstMismatchIndex = -1;
+        let actual = 0;
+        let expected = 0;
 
         // Go through every sample and make sure it has been shaped exactly
         // according to the shaping curve we gave it.
         for (let i = 0; i < buffer.length; ++i) {
-          let input = inputData[i];
+          const x = inputData[i];
 
-          // Calculate an index based on input -1 -> +1 with 0 being at the
-          // center of the curve data.
-          let index = Math.floor(numberOfCurveFrames * 0.5 * (input + 1));
+          const v = ((N - 1) * 0.5) * (x + 1);
+          const k = Math.floor(v);
+          const f = v - k;
 
-          // Clip index to the input range of the curve.
-          // This takes care of input outside of nominal range -1 -> +1
-          index = index < 0 ? 0 : index;
-          index =
-              index > numberOfCurveFrames - 1 ? numberOfCurveFrames - 1 : index;
+          let y;
+          if (v < 0) {
+            y = c[0];
+          } else if (v >= N - 1) {
+            y = c[N - 1];
+          } else {
+            y = (1 - f) * c[k] + f * c[k + 1];
+          }
 
-          let expectedOutput = waveShapingCurve[index];
-
-          let output = outputData[i];
-
-          if (output != expectedOutput) {
-            success = false;
+          if (Math.abs(outputData[i] - y) > tolerance) {
+            firstMismatchIndex = i;
+            actual = outputData[i];
+            expected = y;
             break;
           }
         }
 
-        should(
-            success, 'WaveShaperNode applied non-linear distortion correctly')
-            .beTrue();
+        assert_equals(
+            firstMismatchIndex,
+            -1,
+            firstMismatchIndex === -1
+                ? 'WaveShaperNode output should match the spec.'
+                : `Mismatch at sample ${firstMismatchIndex}: ` +
+                    `actual = ${actual}, expected = ${expected}, ` +
+                    `tolerance = ${tolerance}`);
       }
 
-      audit.define('test', function(task, should) {
+      promise_test(async t => {
         // Create offline audio context.
         context = new OfflineAudioContext(1, numberOfRenderFrames, sampleRate);
 
         // source -> waveshaper -> destination
-        let source = context.createBufferSource();
-        let waveshaper = context.createWaveShaper();
+        const source = new AudioBufferSourceNode(context);
+        const waveshaper = new WaveShaperNode(context);
         source.connect(waveshaper);
         waveshaper.connect(context.destination);
 
@@ -113,14 +123,11 @@
         waveShapingCurve = generateWaveShapingCurve();
         waveshaper.curve = waveShapingCurve;
 
-        source.start(0);
+        source.start();
 
-        context.startRendering()
-            .then(buffer => checkShapedCurve(buffer, should))
-            .then(task.done.bind(task));
-      });
-
-      audit.run();
+        const renderedBuffer = await context.startRendering();
+        checkShapedCurve(renderedBuffer);
+      }, 'WaveShaperNode applies non-linear distortion correctly');
     </script>
   </body>
 </html>
diff --git a/tests/wpt/tests/webcodecs/README.md b/tests/wpt/tests/webcodecs/README.md
index 376308b5d1d..1f4fccd4156 100644
--- a/tests/wpt/tests/webcodecs/README.md
+++ b/tests/wpt/tests/webcodecs/README.md
@@ -69,6 +69,16 @@ avifenc -r l -d 8 -y 444 -s 0 four-colors.png four-colors-limited-range-444-8bpc
 avifenc -r f -d 10 -y 444 -s 0 --nclx 9/16/9 four-colors.png four-colors-full-range-bt2020-pq-444-10bpc.avif
 ```
 
+### four-colors-full-range-(420|422|444)-hlg-(10|12)bpc.avif
+```
+avifenc -r f -d 10 -y 420 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-420-10bpc.avif
+avifenc -r f -d 10 -y 422 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-422-10bpc.avif
+avifenc -r f -d 10 -y 444 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-444-10bpc.avif
+avifenc -r f -d 12 -y 420 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-420-12bpc.avif
+avifenc -r f -d 12 -y 422 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-422-12bpc.avif
+avifenc -r f -d 12 -y 444 -s 0 --nclx 9/18/9 four-colors.png four-colors-full-range-hlg-444-12bpc.avif
+```
+
 ### four-colors.jpg
 Used [Sqoosh.app](https://squoosh.app/) with MozJPEG compression and RGB
 channels. exiftool was then used to add an orientation marker.
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-10bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-10bpc.avif
new file mode 100644
index 00000000000..8209e763f52
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-10bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-12bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-12bpc.avif
new file mode 100644
index 00000000000..79103149b71
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-420-12bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-10bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-10bpc.avif
new file mode 100644
index 00000000000..0699fc09ac6
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-10bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-12bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-12bpc.avif
new file mode 100644
index 00000000000..93ef46ad29c
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-422-12bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-10bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-10bpc.avif
new file mode 100644
index 00000000000..3da7037c110
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-10bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-12bpc.avif b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-12bpc.avif
new file mode 100644
index 00000000000..85db04ec202
Binary files /dev/null and b/tests/wpt/tests/webcodecs/four-colors-full-range-hlg-444-12bpc.avif differ
diff --git a/tests/wpt/tests/webcodecs/image-decoder-utils.js b/tests/wpt/tests/webcodecs/image-decoder-utils.js
index eccab9b09a4..cf389620e14 100644
--- a/tests/wpt/tests/webcodecs/image-decoder-utils.js
+++ b/tests/wpt/tests/webcodecs/image-decoder-utils.js
@@ -60,9 +60,22 @@ function testFourColorsDecodeBuffer(buffer, mimeType, options = {}) {
     if (options.tolerance === undefined)
       options.tolerance = 0;
 
+    if (options.colorSpace !== undefined) {
+      assert_equals(
+          result.image.colorSpace.primaries, options.colorSpace.primaries);
+      assert_equals(
+          result.image.colorSpace.transfer, options.colorSpace.transfer);
+      assert_equals(result.image.colorSpace.matrix, options.colorSpace.matrix);
+      assert_equals(
+          result.image.colorSpace.fullRange, options.colorSpace.fullRange);
+    }
+
     let canvas = new OffscreenCanvas(
         result.image.displayWidth, result.image.displayHeight);
     let ctx = canvas.getContext('2d');
+    if (ctx.globalHDRHeadroom !== undefined) {
+      ctx.globalHDRHeadroom = Infinity;
+    }
     ctx.drawImage(result.image, 0, 0);
 
     let top_left = ctx.getImageData(0, 0, 1, 1);
diff --git a/tests/wpt/tests/webcodecs/image-decoder.https.any.js b/tests/wpt/tests/webcodecs/image-decoder.https.any.js
index 9ca28e49c4a..9469f51914f 100644
--- a/tests/wpt/tests/webcodecs/image-decoder.https.any.js
+++ b/tests/wpt/tests/webcodecs/image-decoder.https.any.js
@@ -1,8 +1,7 @@
 // META: global=window,dedicatedworker
 // META: script=/webcodecs/image-decoder-utils.js
 
-function testFourColorsDecode(filename, mimeType, options = {}) {
-  var decoder = null;
+async function testFourColorsDecode(filename, mimeType, options = {}) {
   return ImageDecoder.isTypeSupported(mimeType).then(support => {
     assert_implements_optional(
         support, 'Optional codec ' + mimeType + ' not supported.');
@@ -14,8 +13,7 @@ function testFourColorsDecode(filename, mimeType, options = {}) {
 
 // Note: Requiring all data to do YUV decoding is a Chromium limitation, other
 // implementations may support YUV decode with partial ReadableStream data.
-function testFourColorsYuvDecode(filename, mimeType, options = {}) {
-  var decoder = null;
+async function testFourColorsYuvDecode(filename, mimeType, options = {}) {
   return ImageDecoder.isTypeSupported(mimeType).then(support => {
     assert_implements_optional(
         support, 'Optional codec ' + mimeType + ' not supported.');
@@ -95,7 +93,6 @@ promise_test(t => {
   return testFourColorDecodeWithExifOrientation(8, null, /*useYuv=*/ true);
 }, 'Test 4:2:0 JPEG w/ EXIF orientation left-bottom.');
 
-
 promise_test(t => {
   return testFourColorsDecode('four-colors.png', 'image/png');
 }, 'Test PNG image decoding.');
@@ -158,6 +155,66 @@ promise_test(t => {
       {yuvFormat: 'I420', tolerance: 3});
 }, 'Test WEBP image YUV 4:2:0 decoding.');
 
+const FOUR_COLORS_AVIF_HLG_COLOR_SPACE = new VideoColorSpace({
+  primaries: 'bt2020',
+  transfer: 'hlg',
+  matrix: 'bt2020-ncl',
+  fullRange: true,
+});
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-420-10bpc.avif', 'image/avif', {
+        yuvFormat: 'I420P10',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 10-bit 4:2:0 decoding.');
+
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-422-10bpc.avif', 'image/avif', {
+        yuvFormat: 'I422P10',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 10-bit 4:2:2 decoding.');
+
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-444-10bpc.avif', 'image/avif', {
+        yuvFormat: 'I444P10',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 10-bit 4:4:4 decoding.');
+
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-420-12bpc.avif', 'image/avif', {
+        yuvFormat: 'I420P12',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 12-bit 4:2:0 decoding.');
+
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-422-12bpc.avif', 'image/avif', {
+        yuvFormat: 'I422P12',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 12-bit 4:2:2 decoding.');
+
+promise_test(t => {
+  return testFourColorsYuvDecode(
+      'four-colors-full-range-hlg-444-12bpc.avif', 'image/avif', {
+        yuvFormat: 'I444P12',
+        colorSpace: FOUR_COLORS_AVIF_HLG_COLOR_SPACE,
+        tolerance: 3
+      });
+}, 'Test AVIF image HDR YUV 12-bit 4:4:4 decoding.');
+
 promise_test(t => {
   return fetch('four-colors.png').then(response => {
     let decoder = new ImageDecoder({data: response.body, type: 'junk/type'});
diff --git a/tests/wpt/tests/webdriver/tests/bidi/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/__init__.py
index e3d2f83a19a..78d4fc55b28 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/__init__.py
@@ -1,10 +1,54 @@
-from typing import Any, Callable, Dict, List, Mapping
+from typing import Any, Callable, Dict, List, Mapping, Literal
 
 from tests.support.sync import AsyncPoll
 from webdriver.bidi.modules.script import ContextTarget
 from webdriver.bidi.undefined import UNDEFINED
 
 
+def get_invalid_cases(
+        type_: Literal["boolean", "list", "string", "dict", "number"],
+        nullable: bool = False) -> List[Any]:
+    """
+    Returns invalid use cases for the specific type with the given restrictions.
+    >>> get_invalid_cases("boolean")
+    [42, None, [], 'foo', {}]
+    >>> get_invalid_cases("list")
+    [42, False, None, 'foo', {}]
+    >>> get_invalid_cases("string")
+    [42, False, None, [], {}]
+    >>> get_invalid_cases("dict")
+    [42, False, None, [], 'foo']
+    >>> get_invalid_cases("number")
+    [False, None, [], 'foo', {}]
+    >>> get_invalid_cases("boolean", nullable=True)
+    [42, [], 'foo', {}]
+    >>> get_invalid_cases("boolean", nullable=False)
+    [42, None, [], 'foo', {}]
+
+    >>> get_invalid_cases("invalid_type")
+    Traceback (most recent call last):
+      ...
+    ValueError: Unexpected type: invalid_type
+
+    """
+    cases = {
+        "boolean": False,
+        "list": [],
+        "string": 'foo',
+        "dict": {},
+        "number": 42,
+    }
+
+    if type_ not in cases:
+        raise ValueError(f"Unexpected type: {type_}")
+
+    result = list(filter(lambda i: i != cases[type_], cases.values()))
+    if not nullable:
+        result.append(None)
+
+    return sorted(result, key=lambda x: str(x))
+
+
 # Compares 2 objects recursively.
 # Actual value can have more keys as part of the forwards-compat design.
 # Expected value can be a value, a callable delegate, asserting the value, or UNDEFINED.
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 16f03b9229a..f3c03917659 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
@@ -31,15 +31,15 @@ async def default_locale(get_current_locale, top_context):
 @pytest.fixture
 def some_locale(default_locale):
     """
-    Returns some locale which is not equal to `default_locale` nor to
-    `another_locale`.
+    Returns some locale which is not equal to `default_locale`.
     """
     for locale in LOCALES:
         if locale != default_locale:
             return locale
 
     raise Exception(
-        f"Unexpectedly could not find locale different from the default {default_locale}")
+        f"Unexpectedly could not find locale different from the default {default_locale}"
+    )
 
 
 @pytest.fixture
@@ -49,8 +49,9 @@ def another_locale(default_locale, some_locale):
     `some_locale`.
     """
     for locale in LOCALES:
-        if locale != default_locale and locale != another_locale:
+        if locale != default_locale and locale != some_locale:
             return locale
 
     raise Exception(
-        f"Unexpectedly could not find locale different from the default {default_locale}")
+        f"Unexpectedly could not find locale different from the default {default_locale} and {some_locale}"
+    )
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 3a3fa527c4f..9f7e01deda3 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
@@ -1,4 +1,5 @@
 import pytest
+from webdriver.bidi.modules.script import ContextTarget
 
 pytestmark = pytest.mark.asyncio
 
@@ -90,3 +91,48 @@ async def test_iframe(
 
     # Assert locale is emulated in the iframe context.
     assert await get_current_locale(iframe) == another_locale
+
+
+async def test_locale_override_applies_to_new_sandbox(
+    bidi_session, new_tab, some_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
+
+
+async def test_locale_override_applies_to_existing_sandbox(
+    bidi_session, new_tab, default_locale, another_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
+
+    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
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/conftest.py
new file mode 100644
index 00000000000..7658953ca49
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/conftest.py
@@ -0,0 +1,26 @@
+import pytest_asyncio
+
+from webdriver.bidi.modules.script import ContextTarget
+
+
+@pytest_asyncio.fixture
+async def is_scripting_enabled(bidi_session):
+    """A fixture that returns a function to check if scripting is enabled in a
+    given browsing context."""
+
+    async def is_scripting_enabled(context):
+        result = await bidi_session.script.evaluate(
+            # `noscript` elements do not render their children if scripting is
+            # enabled.
+            expression="""(()=>{
+                const n = document.createElement('noscript');
+                n.innerHTML = '<div></div>';
+                return n.childElementCount === 0;
+            })()""",
+            target=ContextTarget(context["context"]),
+            await_promise=False,
+        )
+
+        return result["value"]
+
+    return is_scripting_enabled
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/contexts.py
new file mode 100644
index 00000000000..e9479a1d521
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/contexts.py
@@ -0,0 +1,91 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_contexts(bidi_session, new_tab, top_context,
+        is_scripting_enabled):
+    # Disable scripting
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"]],
+        enabled=False
+    )
+
+    # Assert scripting is disabled only in the required context.
+    assert await is_scripting_enabled(new_tab) is False
+    assert await is_scripting_enabled(top_context) is True
+
+    # Reset scripting override.
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"]],
+        enabled=None)
+
+    # Assert scripting is enabled.
+    assert await is_scripting_enabled(new_tab) is True
+    assert await is_scripting_enabled(top_context) is True
+
+
+async def test_multiple_contexts(bidi_session, new_tab, is_scripting_enabled):
+    new_context = await bidi_session.browsing_context.create(type_hint="tab")
+
+    # Disable scripting
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"], new_context["context"]],
+        enabled=False
+    )
+
+    # Assert scripting is disabled in all the required contexts.
+    assert await is_scripting_enabled(new_tab) is False
+    assert await is_scripting_enabled(new_context) is False
+
+    # Reset scripting override.
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"], new_context["context"]],
+        enabled=None)
+
+    # Assert scripting is enabled.
+    assert await is_scripting_enabled(new_tab) is True
+    assert await is_scripting_enabled(new_context) is True
+
+
+@pytest.mark.parametrize("domain", ["", "alt"],
+                         ids=["same_origin", "cross_origin"])
+async def test_iframe(
+        bidi_session,
+        new_tab,
+        is_scripting_enabled,
+        domain,
+        inline,
+):
+    # Disable scripting
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"]], enabled=False
+    )
+
+    # Assert scripting is disabled in the required context.
+    assert await is_scripting_enabled(new_tab) is False
+
+    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 scripting is disabled in the iframe context.
+    assert await is_scripting_enabled(iframe) is False
+
+    # Enable scripting back
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[new_tab["context"]], enabled=None
+    )
+
+    # Assert scripting is enabled in the iframe context.
+    assert await is_scripting_enabled(iframe) is True
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/enabled.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/enabled.py
new file mode 100644
index 00000000000..782f292faf9
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/enabled.py
@@ -0,0 +1,25 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_enabled_set_override_and_reset(bidi_session, top_context,
+        is_scripting_enabled):
+    # By default, scripting is enabled.
+    assert await is_scripting_enabled(top_context) is True
+
+    # Disable scripting.
+    await bidi_session.emulation.set_scripting_enabled(
+        enabled=False,
+        contexts=[top_context["context"]],
+    )
+
+    assert await is_scripting_enabled(top_context) is False
+
+    # Reset scripting.
+    await bidi_session.emulation.set_scripting_enabled(
+        enabled=None,
+        contexts=[top_context["context"]],
+    )
+
+    assert await is_scripting_enabled(top_context) is True
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/invalid.py
new file mode 100644
index 00000000000..a435092cf6e
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/invalid.py
@@ -0,0 +1,125 @@
+import pytest
+
+import webdriver.bidi.error as error
+from tests.bidi import get_invalid_cases
+from webdriver.bidi.undefined import UNDEFINED
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("list"))
+async def test_params_contexts_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            contexts=value
+        )
+
+
+async def test_params_contexts_empty_list(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            contexts=[])
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("string"))
+async def test_params_contexts_entry_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            contexts=[value])
+
+
+async def test_params_contexts_entry_invalid_value(bidi_session):
+    with pytest.raises(error.NoSuchFrameException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            contexts=["_invalid_"],
+        )
+
+
+async def test_params_contexts_iframe(bidi_session, new_tab, get_test_page):
+    url = get_test_page(as_frame=True)
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"], url=url, wait="complete"
+    )
+
+    contexts = await bidi_session.browsing_context.get_tree(
+        root=new_tab["context"])
+    assert len(contexts) == 1
+    frames = contexts[0]["children"]
+    assert len(frames) == 1
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            contexts=[frames[0]["context"]],
+        )
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("list"))
+async def test_params_user_contexts_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            user_contexts=value,
+        )
+
+
+async def test_params_user_contexts_empty_list(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            user_contexts=[],
+        )
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("string"))
+async def test_params_user_contexts_entry_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            user_contexts=[value],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "somestring"])
+async def test_params_user_contexts_entry_invalid_value(bidi_session, value):
+    with pytest.raises(error.NoSuchUserContextException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False,
+            user_contexts=[value],
+        )
+
+
+async def test_params_missing_contexts_and_user_contexts(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=False
+        )
+
+
+async def test_params_enabled_missing(bidi_session, top_context):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=UNDEFINED,
+            contexts=[top_context["context"]],
+        )
+
+
+@pytest.mark.parametrize("value", get_invalid_cases("boolean", nullable=True))
+async def test_params_enabled_invalid_type(bidi_session, top_context, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=value,
+            contexts=[top_context["context"]],
+        )
+
+
+async def test_params_enabled_invalid_value(bidi_session, top_context):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.emulation.set_scripting_enabled(
+            enabled=True,
+            contexts=[top_context["context"]],
+        )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/user_contexts.py b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/user_contexts.py
new file mode 100644
index 00000000000..ae4b4af04d4
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/emulation/set_scripting_enabled/user_contexts.py
@@ -0,0 +1,145 @@
+import pytest
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_user_contexts(
+        bidi_session,
+        create_user_context,
+        new_tab,
+        is_scripting_enabled,
+):
+    user_context = await create_user_context()
+    context_in_user_context = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab")
+
+    assert await is_scripting_enabled(new_tab) is True
+
+    # Disable scripting
+    await bidi_session.emulation.set_scripting_enabled(
+        user_contexts=[user_context],
+        enabled=False)
+
+    # Assert scripting is disabled in user context.
+    assert await is_scripting_enabled(context_in_user_context) is False
+
+    # Assert the default user context is not affected.
+    assert await is_scripting_enabled(new_tab) is True
+
+    # Create a new context in the user context.
+    another_context_in_user_context = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab")
+    # Assert scripting is disabled in a new browsing context of the user context.
+    assert await is_scripting_enabled(
+        another_context_in_user_context) is False
+
+
+async def test_set_to_default_user_context(
+        bidi_session,
+        new_tab,
+        create_user_context,
+        is_scripting_enabled,
+):
+    user_context = await create_user_context()
+    context_in_user_context = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab"
+    )
+
+    await bidi_session.emulation.set_scripting_enabled(
+        user_contexts=["default"],
+        enabled=False,
+    )
+
+    # Make sure that the scripting changes are only applied to the context
+    # associated with default user context.
+    assert await is_scripting_enabled(context_in_user_context) is True
+    assert await is_scripting_enabled(new_tab) is False
+
+    # Create a new context in the default context.
+    context_in_default_context = await bidi_session.browsing_context.create(
+        type_hint="tab"
+    )
+
+    assert await is_scripting_enabled(context_in_default_context) is False
+
+    # Reset scripting override.
+    await bidi_session.emulation.set_scripting_enabled(
+        user_contexts=["default"],
+        enabled=None
+    )
+
+
+async def test_set_to_multiple_user_contexts(
+        bidi_session,
+        create_user_context,
+        is_scripting_enabled,
+):
+    # Create the first user context.
+    user_context_1 = await create_user_context()
+    # Create a browsing context within the first user context.
+    context_in_user_context_1 = await bidi_session.browsing_context.create(
+        user_context=user_context_1, type_hint="tab"
+    )
+    # Create the second user context.
+    user_context_2 = await create_user_context()
+    # Create a browsing context within the second user context.
+    context_in_user_context_2 = await bidi_session.browsing_context.create(
+        user_context=user_context_2, type_hint="tab"
+    )
+    # Disable scripting for both user contexts.
+    await bidi_session.emulation.set_scripting_enabled(
+        user_contexts=[user_context_1, user_context_2],
+        enabled=False
+    )
+
+    # Assert scripting is disabled in the browsing context of the first user context.
+    assert await is_scripting_enabled(context_in_user_context_1) is False
+    # Assert scripting is disabled in the browsing context of the second user context.
+    assert await is_scripting_enabled(context_in_user_context_2) is False
+
+
+async def test_set_to_user_context_and_then_to_context(
+        bidi_session,
+        create_user_context,
+        new_tab,
+        is_scripting_enabled,
+):
+    user_context = await create_user_context()
+    context_in_user_context_1 = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab"
+    )
+
+    # Apply scripting override to the user context.
+    await bidi_session.emulation.set_scripting_enabled(
+        user_contexts=[user_context],
+        enabled=False
+    )
+
+    # Apply scripting override now only to the context.
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[context_in_user_context_1["context"]],
+        enabled=None
+    )
+    assert await is_scripting_enabled(context_in_user_context_1) is True
+
+    await bidi_session.browsing_context.reload(
+        context=context_in_user_context_1["context"], wait="complete"
+    )
+
+    # Make sure that after reload the scripting is still updated.
+    assert await is_scripting_enabled(context_in_user_context_1) is True
+
+    # Create a new context in the user context.
+    context_in_user_context_2 = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab"
+    )
+    # Make sure that the scripting override for the user context is applied.
+    assert await is_scripting_enabled(context_in_user_context_2) is False
+
+    await bidi_session.emulation.set_scripting_enabled(
+        contexts=[context_in_user_context_1["context"]],
+        enabled=None,
+    )
+
+    # Make sure that the scripting override was reset.
+    assert await is_scripting_enabled(context_in_user_context_1) is True
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/collector.py b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/collector.py
new file mode 100644
index 00000000000..8e77058077c
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/collector.py
@@ -0,0 +1,76 @@
+import pytest
+import webdriver.bidi.error as error
+
+from .. import PAGE_EMPTY_TEXT
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_disowned_collector(
+    bidi_session,
+    url,
+    setup_collected_response,
+):
+    [request, collector] = await setup_collected_response(
+        fetch_url=url(PAGE_EMPTY_TEXT)
+    )
+
+    # disown using get_data
+    await bidi_session.network.get_data(
+        request=request, data_type="response", collector=collector, disown=True
+    )
+
+    # Check that you can no longer disown data with
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request=request, data_type="response", collector=collector
+        )
+
+
+async def test_several_collectors(
+    bidi_session,
+    url,
+    add_data_collector,
+    setup_collected_response,
+):
+    collector = await add_data_collector(collector_type="blob", data_types=["response"])
+    [request, other_collector] = await setup_collected_response(
+        fetch_url=url(PAGE_EMPTY_TEXT)
+    )
+
+    # disown with the first collector
+    await bidi_session.network.disown_data(
+        request=request, data_type="response", collector=collector
+    )
+
+    # Check that you can no longer get or disown data with the first collector,
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request=request, data_type="response", collector=collector
+        )
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.get_data(
+            request=request, data_type="response", collector=collector
+        )
+
+    # But the data should still be available from the other collector or without
+    # a collector parameter.
+    await bidi_session.network.get_data(
+        request=request, data_type="response", collector=other_collector
+    )
+    await bidi_session.network.get_data(request=request, data_type="response")
+
+    # disown with the other collector
+    await bidi_session.network.disown_data(
+        request=request, data_type="response", collector=other_collector
+    )
+
+    # Check the data can no longer be retrieved or disowned
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request=request, data_type="response", collector=other_collector
+        )
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.get_data(request=request, data_type="response")
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/invalid.py
new file mode 100644
index 00000000000..d3cfb3ec85c
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/invalid.py
@@ -0,0 +1,91 @@
+import pytest
+import webdriver.bidi.error as error
+
+from .. import PAGE_EMPTY_TEXT
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_request_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.disown_data(
+            request=value, data_type="response", collector="collector_id"
+        )
+
+
+async def test_params_request_non_existent(bidi_session):
+    collector = await bidi_session.network.add_data_collector(
+        data_types=["response"], max_encoded_data_size=1000
+    )
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request="does_not_exist", data_type="response", collector=collector
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_data_type_invalid_type(bidi_session, value):
+    collector = await bidi_session.network.add_data_collector(
+        data_types=["response"], max_encoded_data_size=1000
+    )
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.disown_data(
+            request="request_id", data_type=value, collector=collector
+        )
+
+
+@pytest.mark.parametrize("value", ["", "invalid"])
+async def test_params_data_type_invalid_value(bidi_session, value):
+    collector = await bidi_session.network.add_data_collector(
+        data_types=["response"], max_encoded_data_size=1000
+    )
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.disown_data(
+            request="request_id", data_type=value, collector=collector
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_collector_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.disown_data(
+            request="request_id", data_type="response", collector=value
+        )
+
+
+async def test_params_collector_non_existent(bidi_session):
+    with pytest.raises(error.NoSuchNetworkCollectorException):
+        await bidi_session.network.disown_data(
+            request="request_id", data_type="response", collector="does_not_exist"
+        )
+
+
+async def test_params_collector_removed_collector(bidi_session):
+    collector = await bidi_session.network.add_data_collector(
+        data_types=["response"], max_encoded_data_size=1000
+    )
+
+    await bidi_session.network.remove_data_collector(collector=collector)
+
+    with pytest.raises(error.NoSuchNetworkCollectorException):
+        await bidi_session.network.disown_data(
+            request="request_id", data_type="response", collector=collector
+        )
+
+
+async def test_params_collector_not_in_collected_data(
+    bidi_session, url, add_data_collector, setup_collected_response
+):
+    too_small_collector = await add_data_collector(
+        data_types=["response"], max_encoded_data_size=1
+    )
+    [request, _] = await setup_collected_response(fetch_url=url(PAGE_EMPTY_TEXT))
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request=request, data_type="response", collector=too_small_collector
+        )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/request.py b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/request.py
new file mode 100644
index 00000000000..7a3fde48705
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/disown_data/request.py
@@ -0,0 +1,29 @@
+import pytest
+import webdriver.bidi.error as error
+
+from .. import PAGE_EMPTY_TEXT
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_request(
+    bidi_session,
+    url,
+    setup_collected_response,
+):
+    [request, collector] = await setup_collected_response(
+        fetch_url=url(PAGE_EMPTY_TEXT)
+    )
+    await bidi_session.network.disown_data(
+        request=request, data_type="response", collector=collector
+    )
+
+    # Check that after calling disown data, you can no longer get or disown the
+    # data.
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.disown_data(
+            request=request, data_type="response", collector=collector
+        )
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.get_data(request=request, data_type="response")
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/invalid.py
index 2ee725bef97..963488865f9 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/get_data/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/get_data/invalid.py
@@ -58,6 +58,20 @@ async def test_params_collector_non_existent(
         )
 
 
+async def test_params_collector_not_in_collected_data(
+    bidi_session, url, add_data_collector, setup_collected_response
+):
+    too_small_collector = await add_data_collector(
+        data_types=["response"], max_encoded_data_size=1
+    )
+    [request, _] = await setup_collected_response(fetch_url=url(PAGE_EMPTY_TEXT))
+
+    with pytest.raises(error.NoSuchNetworkDataException):
+        await bidi_session.network.get_data(
+            request=request, data_type="response", collector=too_small_collector
+        )
+
+
 @pytest.mark.parametrize("value", ["", "true", "false", 42, {}, []])
 async def test_params_disown_invalid_type(
     bidi_session, url, setup_collected_response, value
diff --git a/tests/wpt/tests/webdriver/tests/classic/perform_actions/pointer_mouse.py b/tests/wpt/tests/webdriver/tests/classic/perform_actions/pointer_mouse.py
index 0a35cf94550..2b069b7c363 100644
--- a/tests/wpt/tests/webdriver/tests/classic/perform_actions/pointer_mouse.py
+++ b/tests/wpt/tests/webdriver/tests/classic/perform_actions/pointer_mouse.py
@@ -316,7 +316,11 @@ def test_move_to_origin_position_within_frame(
 
     events = get_events(session)
     assert len(events) == 1
-    assert events[0] == target_point
+
+    # For now we are allowing any of floor, ceil, or precise values, because
+    # it's unclear what the actual spec requirements really are
+    assert events[0][0] == pytest.approx(target_point[0], abs=1.0)
+    assert events[0][1] == pytest.approx(target_point[1], abs=1.0)
 
 
 @pytest.mark.parametrize("missing", ["x", "y"])
diff --git a/tests/wpt/tests/webrtc-encoded-transform/RTCRtpScriptTransform-encoded-transform-worker.js b/tests/wpt/tests/webrtc-encoded-transform/RTCRtpScriptTransform-encoded-transform-worker.js
index 89e421ae9aa..6dd426d4618 100644
--- a/tests/wpt/tests/webrtc-encoded-transform/RTCRtpScriptTransform-encoded-transform-worker.js
+++ b/tests/wpt/tests/webrtc-encoded-transform/RTCRtpScriptTransform-encoded-transform-worker.js
@@ -18,15 +18,14 @@ function RestoreAndWrite(chunk, transformer) {
     chunk.value.data = chunk.value.data.slice(0, chunk.value.data.byteLength - 1);
     let frameData = chunk.value.data;
     transformer.writer.write(chunk.value);
-    if (lastByte === modification && !chunk.value.getMetadata().rtpTimestamp && frameData.byteLength == 0) {
+    if (lastByte === modification && frameData.byteLength == 0) {
         self.postMessage("got expected");
     }
     else {
         self.postMessage("unexpected value: lastByte (got " + lastByte +
             ", expected " + modification +
             "),  frame data length (got " + frameData.byteLength +
-            ", expected 0), rtpTimestamp (got " +
-             chunk.value.getMetadata().rtpTimestamp + ", expected null)");
+            ", expected 0))");
     }
 }
 onrtctransform = (event) => {
diff --git a/tests/wpt/tests/webrtc-encoded-transform/tentative/RTCEncodedVideoFrame-constructor.html b/tests/wpt/tests/webrtc-encoded-transform/tentative/RTCEncodedVideoFrame-constructor.html
new file mode 100644
index 00000000000..a19e4b7c942
--- /dev/null
+++ b/tests/wpt/tests/webrtc-encoded-transform/tentative/RTCEncodedVideoFrame-constructor.html
@@ -0,0 +1,67 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Timestamps in RTCEncodedFrame metadata</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/webrtc/RTCPeerConnection-helper.js"></script>
+<script src="RTCEncodedFrame-timestamps-helper.js"></script>
+<script>
+'use strict';
+
+function doWork() {
+  onrtctransform = async e => {
+    const reader = e.transformer.readable.getReader();
+    const writer = e.transformer.writable.getWriter();
+    for (let i = 0; i<10; i++) {
+      const frameOrDone = await reader.read();
+      if (frameOrDone.done) {
+        self.postMessage("Unexpected end of stream");
+        return;
+      }
+      const originalFrame = frameOrDone.value;
+      const originalMetadata= originalFrame.getMetadata();
+      const newFrame = new RTCEncodedVideoFrame(originalFrame, {metadata: originalMetadata});
+
+      await writer.write(newFrame);
+    }
+    self.postMessage("OK");
+  };
+}
+
+async function testAudioFrameConstructor(t, enableAbsCaptureTime, enableForSenderFrames) {
+  const worker = new Worker(`data:text/javascript,(${doWork.toString()})()`);
+  const workerPromise = new Promise((resolve, reject) => {
+    worker.onmessage = t.step_func(message => {
+      if (message.data == "OK") {
+        resolve();
+      } else {
+        reject(message.data);
+      }
+    });
+  });
+
+  await initiateCall(
+      t, /*streamOptions=*/{audio: false, video: true},
+      /*enableAbsCaptureTime=*/enableAbsCaptureTime, worker, /*enableSenderTransform=*/enableForSenderFrames,
+      /*enableReceiverTransform=*/!enableForSenderFrames);
+
+  return workerPromise;
+}
+
+promise_test(async t => {
+  return testAudioFrameConstructor(t, /*enableAbsCaptureTime=*/false, /*enableForSenderFrames=*/false)
+}, 'Constructing a new receiver audio frame explicitly using metadata from an existing frame works');
+
+promise_test(async t => {
+  return testAudioFrameConstructor(t, /*enableAbsCaptureTime=*/false, /*enableForSenderFrames=*/true)
+}, 'Constructing a new sender audio frame explicitly using metadata from an existing frame works');
+
+promise_test(async t => {
+  return testAudioFrameConstructor(t, /*enableAbsCaptureTime=*/true, /*enableForSenderFrames=*/false)
+}, 'Constructing a new receiver audio frame explicitly using metadata from an existing frame works, absCaptureTime extension enabled');
+
+promise_test(async t => {
+  return testAudioFrameConstructor(t, /*enableAbsCaptureTime=*/true, /*enableForSenderFrames=*/true)
+}, 'Constructing a new sender audio frame explicitly using metadata from an existing frame works, absCaptureTime extension enabled');
+
+</script>
diff --git a/tests/wpt/tests/webvtt/META.yml b/tests/wpt/tests/webvtt/META.yml
index 949f312d7ac..99076f81582 100644
--- a/tests/wpt/tests/webvtt/META.yml
+++ b/tests/wpt/tests/webvtt/META.yml
@@ -2,3 +2,5 @@ spec: https://w3c.github.io/webvtt/
 suggested_reviewers:
   - silviapfeiffer
   - BenjaminSchaaf
+  - zcorpan
+  - alastor0325
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition-ref.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition-ref.html
deleted file mode 100644
index 1ff5b84ced6..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition-ref.html
+++ /dev/null
@@ -1,52 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-<title>Reference for WebVTT rendering, cue reposition after enabling controls</title>
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-video {
-    position: absolute;
-    width:320px;
-    height:240px;
-}
-.cue {
-    position: absolute;
-    bottom: 50px;
-    left: 0;
-    right: 0;
-    text-align: center;
-    color: green;
-    font-size: 50px;
-    font-family: Ahem, sans-serif;
-}
-.cue > span {
-    background: rgba(0,0,0,0.8);
-}
-
-.media-container {
-    display: inline-block;
-    position: relative;
-    border: solid black 1px;
-    border-box: content-box;
-    width: 320px;
-    height: 240px;
-}
-</style>
-<div class="media-container">
-    <span class="cue"><span>Foo</span></span>
-    <video controls autoplay onplaying="runTest()">
-        <source src="/media/sound_5.mp3" type="audio/mp3">
-        <source src="/media/sound_5.oga" type="audio/ogg">
-    </video>
-</div>
-<script src="/common/reftest-wait.js"></script>
-<script>
-    async function runTest() {
-        let media = document.getElementsByTagName("video")[0];
-        media.pause();
-        media.currentTime = 0;
-        media.addEventListener("seeked", (event) => {
-            takeScreenshot();
-        });
-    }
-</script>
-</html>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition.html
deleted file mode 100644
index 9e299c8d0d9..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/enable_controls_reposition.html
+++ /dev/null
@@ -1,43 +0,0 @@
-<!doctype html>
-<html class="reftest-wait">
-<title>WebVTT rendering, cue reposition after enabling controls</title>
-<link rel="match" href="enable_controls_reposition-ref.html">
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-video {
-  width: 320px;
-  height: 240px;
-}
-::cue {
-  font-family: Ahem, sans-serif;
-  font-size: 50px;
-  color: green;
-}
-.media-container {
-    display: inline-block;
-    position: relative;
-    border: solid black 1px;
-    border-box: content-box;
-    width: 320px;
-    height: 240px;
-}
-</style>
-<div class="media-container">
-<video controls autoplay onplaying="runTest()">
-    <source src="/media/sound_5.mp3" type="audio/mp3">
-    <source src="/media/sound_5.oga" type="audio/ogg">
-    <track src="support/foo.vtt">
-</video>
-</div>
-<script src="/common/reftest-wait.js"></script>
-<script>
-async function runTest() {
-    document.getElementsByTagName("track")[0].track.mode = "showing";
-    let media = document.getElementsByTagName("video")[0];
-    media.pause();
-    media.currentTime = 0;
-    media.addEventListener("seeked", (event) => {
-        takeScreenshot();
-    });
-}
-</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls-ref.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls-ref.html
deleted file mode 100644
index 65b23298f00..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls-ref.html
+++ /dev/null
@@ -1,33 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-<title>Reference for WebVTT rendering, the subtitles is not covered by or covering the controls</title>
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-.video {
-    display: inline-block;
-    position: absolute;
-    width: 320px;
-    height: 400px;
-    font-size: 20px;
-}
-.cue {
-    position: absolute;
-    bottom: 0;
-    left: 0;
-    right: 0;
-    text-align: center;
-    padding-bottom: 40px;
-    font-family: Ahem, sans-serif;
-    color: green;
-}
-.cue > span {
-    background: rgba(0,0,0,0.8);
-}
-</style>
-<script src="/common/reftest-wait.js"></script>
-<div class="video"><span class="cue"><span>This is a test subtitle</span></span></div>
-<video width="320" height="400" autoplay controls onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
-    <source src="/media/white.webm" type="video/webm">
-    <source src="/media/white.mp4" type="video/mp4">
-    <track>
-</video>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls.html
deleted file mode 100644
index 349a121d9b5..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_height400_with_controls.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-<title>WebVTT rendering, the subtitles is not covered by or covering the controls</title>
-<link rel="match" href="media_height400_with_controls-ref.html">
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-html { overflow:hidden }
-body { margin:0 }
-::cue {
-    font-family: Ahem, sans-serif;
-    color: green
-}
-</style>
-<script src="/common/reftest-wait.js"></script>
-<video width="320" height="400" autoplay controls 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.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/media_with_controls-ref.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_with_controls-ref.html
deleted file mode 100644
index d18b3ce6134..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_with_controls-ref.html
+++ /dev/null
@@ -1,33 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-<title>Reference for WebVTT rendering, the subtitles are moved up to correct position when controls are visible</title>
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-.video {
-    display: inline-block;
-    position: absolute;
-    width: 320px;
-    height: 180px;
-    font-size: 9px;
-}
-.cue {
-    position: absolute;
-    bottom: 0;
-    left: 0;
-    right: 0;
-    text-align: center;
-    padding-bottom: 9px;
-    font-family: Ahem, sans-serif;
-    color: green;
-}
-.cue > span {
-    background: rgba(0,0,0,0.8);
-}
-</style>
-<script src="/common/reftest-wait.js"></script>
-<div class="video"><span class="cue"><span>This is a test subtitle</span></span></div>
-<video width="320" height="180" autoplay controls onplaying="this.onplaying = null; this.pause(); takeScreenshot();">
-    <source src="/media/white.webm" type="video/webm">
-    <source src="/media/white.mp4" type="video/mp4">
-    <track>
-</video>
diff --git a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_with_controls.html b/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_with_controls.html
deleted file mode 100644
index dda72d16a6e..00000000000
--- a/tests/wpt/tests/webvtt/rendering/cues-with-video/processing-model/media_with_controls.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<html class="reftest-wait">
-<title>WebVTT rendering, the subtitles are moved up to correct position when controls are visible</title>
-<link rel="match" href="media_with_controls-ref.html">
-<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-<style>
-html { overflow:hidden }
-body { margin:0 }
-::cue {
-    font-family: Ahem, sans-serif;
-    color: green
-}
-</style>
-<script src="/common/reftest-wait.js"></script>
-<video width="320" height="180" autoplay controls 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.vtt">
-    <script>
-    document.getElementsByTagName('track')[0].track.mode = 'showing';
-    </script>
-</video>
-</html>