Auto merge of #27060 - servo-wpt-sync:wpt_update_23-06-2020, r=jdm

Sync WPT with upstream (23-06-2020)

Automated downstream sync of changes from upstream as of 23-06-2020.
[no-wpt-sync]
r? @servo-wpt-sync

tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini

@@ -4,7 +4,7 @@
     expected: TIMEOUT
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Fetching a blob URL immediately before revoking it works in an iframe.]
     expected: FAIL

tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-003.html]
-  [Miss float below something else]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/css/css-transforms/transform-box/view-box-mutation-001.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-001.html]
+  expected: FAIL

tests/wpt/metadata-layout-2020/css/css-transforms/transform-box/view-box-mutation-002.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-002.html]
+  expected: FAIL

tests/wpt/metadata-layout-2020/css/css-transforms/transform-box/view-box-mutation-003.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-003.html]
+  expected: FAIL

tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini

@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini

@@ -8,3 +8,6 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
+  [doesn't look up handleEvent method on callable event listeners]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini

@@ -1,4 +0,0 @@
-[elementFromPoint-001.html]
-  [CSSOM View - 5 - extensions to the Document interface]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini

@@ -17,6 +17,3 @@
   [test the top of layer]
     expected: FAIL
 
-  [test some point of the element: top left corner]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/custom-elements/reactions/HTMLMediaElement.html.ini

@@ -1,2 +0,0 @@
-[HTMLMediaElement.html]
-  expected: TIMEOUT

tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini

@@ -312,27 +312,24 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/plain */*]
     expected: FAIL
 
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 

tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini

@@ -53,6 +53,3 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/fetch/http-cache/split-cache.tentative.html.ini

@@ -5,3 +5,9 @@
   [HTTP Cache - Partioning by top-level origin 1]
     expected: FAIL
 
+  [HTTP cache is not shared between same-site frames with cross-site top-level frames]
+    expected: FAIL
+
+  [HTTP cache is not shared between cross-site top-level frames]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini

@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini

@@ -1,4 +0,0 @@
-[traverse_the_history_3.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini

@@ -1,2 +0,0 @@
-[cross-origin-objects-on-new-window.html]
-  expected: TIMEOUT

tests/wpt/metadata-layout-2020/html/interaction/focus/processing-model/textarea-scroll-selection.html.ini

@@ -0,0 +1,4 @@
+[textarea-scroll-selection.html]
+  [programatic focus() scrolls selection into view including ancestors]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini

@@ -1,4 +1,5 @@
 [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
 

tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini

@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_escaping-3.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
 

tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini

@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 

tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini

@@ -1,4 +0,0 @@
-[form-double-submit-2.html]
-  [preventDefault should allow onclick submit() to succeed]
-    expected: FAIL
-

tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini

@@ -0,0 +1,4 @@
+[form-double-submit-3.html]
+  [<button> should have the same double-submit protection as <input type=submit>]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html.ini

@@ -0,0 +1,4 @@
+[jsurl-form-submit.tentative.html]
+  [Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.]
+    expected: FAIL
+

tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini

@@ -1,9 +1,10 @@
 [promise-job-entry.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 

tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini

@@ -1,5 +1,4 @@
 [realtimeanalyser-fft-scaling.html]
-  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 

tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini

@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+

tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini

@@ -0,0 +1,5 @@
+[018.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, javascript:]
+    expected: TIMEOUT
+

tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini

@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: TIMEOUT

tests/wpt/metadata/MANIFEST.json

@@ -573,6 +573,17 @@
        ]
       }
      },
+     "replaced-elements": {
+      "attributes-for-embedded-content-and-images": {
+       "input-image-content-crash.html": [
+        "afeba98912d9706c3a2e32562571588a86e614d7",
+        [
+         null,
+         {}
+        ]
+       ]
+      }
+     },
      "the-details-element": {
       "empty-crash.html": [
        "d409eff4a88c88011e7a8ffc48d1dc7e71462d7a",
@@ -123742,6 +123753,45 @@
        {}
       ]
      ],
+     "trailing-child-margin-000.html": [
+      "d204483a33ebff421cf9f3da9fab2d1183fcd1c0",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "trailing-child-margin-001.html": [
+      "7f13b8953d9949b6b9f25bfc33662406537a8f9c",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "trailing-child-margin-002.html": [
+      "3011d23711459b6c21300e0e53d38180b987ec09",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "widows-orphans-001.html": [
       "8da27f0b6594fc7ddd90bdb160be8f80a9479038",
       [
@@ -158597,7 +158647,7 @@
       ]
      ],
      "paint-function-arguments.https.html": [
-      "fc303bf12839617bc24b0972d23520950ef4cea8",
+      "c613bd159f928e91dac25fba4a83b344843d8ade",
       [
        null,
        [
@@ -166006,6 +166056,19 @@
         ],
         {}
        ]
+      ],
+      "replaced-element-012.tentative.html": [
+       "e8bd0b60ca7dbaeec0ae27c362346f02d7735618",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "auto-scrollbar-inside-stf-abspos.html": [
@@ -186388,7 +186451,7 @@
         {}
        ]
       ],
-      "view-box-mutation.html": [
+      "view-box-mutation-001.html": [
        "d0c85fd59d36e06180bbea07700d6f7bc69e9559",
        [
         null,
@@ -186401,6 +186464,32 @@
         {}
        ]
       ],
+      "view-box-mutation-002.html": [
+       "d18d823409c9d43c137d6a2edc7853dc9c96068b",
+       [
+        null,
+        [
+         [
+          "/css/css-transforms/transform-box/reference/greensquare200x200.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "view-box-mutation-003.html": [
+       "873972885481d5ae780b1dbdb80541e41e65cec4",
+       [
+        null,
+        [
+         [
+          "/css/css-transforms/transform-box/reference/greensquare200x200.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "view-box-nested.html": [
        "9e7fc17e2a5bc8c33b412d9f3c6e96caba60009a",
        [
@@ -231563,6 +231652,19 @@
       ],
       {}
      ]
+    ],
+    "forced-colors-mode-28.html": [
+     "4e00c65357f84cd0206baba679469f25f9055c75",
+     [
+      null,
+      [
+       [
+        "/forced-colors-mode/forced-colors-mode-28-ref.html",
+        "=="
+       ]
+      ],
+      {}
+     ]
     ]
    },
    "html": {
@@ -303131,7 +303233,7 @@
       []
      ],
      "paint-function-arguments-ref.html": [
-      "6391d17f01ae4f7f2366d21b66a42fb380401916",
+      "764c8f3c78b7a3e4e494726675bedbb3d2d99789",
       []
      ],
      "paint2d-composite-ref.html": [
@@ -323095,11 +323197,11 @@
        "445b0bdd2ec95a1ac9be08228503475b386cf961",
        []
       ],
-      "split-origin-popup-with-iframe.html": [
+      "split-cache-popup-with-iframe.html": [
-       "b66ccfb43b4017e5013e5ebd751dc3e54a84bc72",
+       "48b16180cfdfa5c9a1755c17d1a7e8704018f6e8",
        []
       ],
-      "split-origin-popup.html": [
+      "split-cache-popup.html": [
        "edb579479414fe980782b54fd39305c12b3de9e7",
        []
       ]
@@ -324083,6 +324185,10 @@
      "39caee40b52aca059a9a65ffde754788228ff9dc",
      []
     ],
+    "forced-colors-mode-28-ref.html": [
+     "9792073004b07893281ec6e4d96f52fb0e3939a1",
+     []
+    ],
     "resources": {
      "float-image.jpg": [
       "ab06d5f94d16e22bb08fad79d6fef662b2a7de5a",
@@ -333499,6 +333605,10 @@
          "8b16672d6b7b501e9db773666ad0f444af33e5ac",
          []
         ],
+        "jsurl-form-submit-iframe.html": [
+         "00a1eefd0fcecce532ed6b05120129259ffbc8e1",
+         []
+        ],
         "location.html": [
          "6724189eff51c3e4d05fa6fb2ee82d58b4032482",
          []
@@ -334491,38 +334601,6 @@
          "e6f5746eb743a338ad6fbd401715fed368e4cf74",
          []
         ],
-        "nested-imports-a.js": [
-         "a127aeb559a0a4d6eedccae19905088fa9fce4b9",
-         []
-        ],
-        "nested-imports-b.js": [
-         "18a5af40cc0ec3a3c10de50f3cd3bffe22c6ec4d",
-         []
-        ],
-        "nested-imports-c.js": [
-         "ec44596aeae7482656b29f1d6aebf6d2ab6a9d54",
-         []
-        ],
-        "nested-imports-d.js": [
-         "cee87849c6258182d6c0085ab504867c197fb8d4",
-         []
-        ],
-        "nested-imports-e.js": [
-         "ec6f0360a608429f774e430a2658f3235d72ed43",
-         []
-        ],
-        "nested-imports-f.js": [
-         "0591e0b3166907bdf94cff3677c2460f9824e082",
-         []
-        ],
-        "nested-imports-g.js": [
-         "86cbe7d3f8e0c29fd7848d9b2626166a0f6f3d30",
-         []
-        ],
-        "nested-imports-h.js": [
-         "a1612912599a4c79307cffe79b43133ceb7f99b0",
-         []
-        ],
         "nested-missing-export.js": [
          "3801ae847afca704cfac9d99428c96851296b8cb",
          []
@@ -337188,7 +337266,7 @@
      []
     ],
     "webauthn.idl": [
-     "70f250286cdcc0f6b66393e88206710891a9d651",
+     "5627180867581a2ef5940bd06c828a5f6157daf2",
      []
     ],
     "webdriver.idl": [
@@ -339385,6 +339463,10 @@
      "b028fcd9a36ff71b0eacd0363121a1fe2774f384",
      []
     ],
+    "about-blank.https.sub.html.headers": [
+     "ea3f6b335c7620acf59f546fd48484bf624ccb38",
+     []
+    ],
     "going-back.sub.https.html.headers": [
      "ea3f6b335c7620acf59f546fd48484bf624ccb38",
      []
@@ -339442,12 +339524,16 @@
      []
     ],
     "resources": {
+     "child-frame-script.mjs": [
+      "038c0f3a848776e10fcf905168788081bb1c233d",
+      []
+     ],
      "helpers.mjs": [
-      "4b742c2b6e731c6fb97717e6785a8198be482fc6",
+      "8943707778c35e56cb0bf15e01c6a060967a0e5a",
       []
      ],
      "send-origin-isolation-header.py": [
-      "b0ba30fcd4939ffff6dfe6fc8959a831187c257e",
+      "67d85620af1e856947c0d7785cf1f224d45ad404",
       []
      ]
     }
@@ -342408,7 +342494,7 @@
      ]
     },
     "idlharness.js": [
-     "cb66fcaa98c06d4f9b0b8136649c1f7119fe75b7",
+     "f336df5f6871fbc5a0120107a410ae677ab92ad5",
      []
     ],
     "idlharness.js.headers": [
@@ -347668,7 +347754,7 @@
      []
     ],
     "requirements_mypy.txt": [
-     "857c7886e18319b342488446563457052c0b6aad",
+     "dc5df8ef9ecef115f24496d0658f53e78dd26691",
      []
     ],
     "runner": {
@@ -354036,7 +354122,7 @@
        []
       ],
       "testloader.py": [
-       "0340294dcaa9c07d9c58bf609fb4f572d1dd1055",
+       "af1b00725dc43ba6e864bec8f8c837923c8da38d",
        []
       ],
       "testrunner.py": [
@@ -355105,7 +355191,7 @@
       []
      ],
      "urltestdata.json": [
-      "1ed95583c12f3d1316e29857aa016e3a0e51a7f4",
+      "ded7107ff757d21fbc79939b92d0f709eba82764",
       []
      ]
     }
@@ -360617,83 +360703,83 @@
     ],
     "resources": {
      "accept-language.py": [
-      "dd00f4b2ee73d74cc60de49f8199c4ea69ffe593",
+      "b68cf355038ca9f9f938a5c3b2f5c75ebfd05487",
       []
      ],
      "accept.py": [
-      "a033ebec6467747744a3236ad38886fb9b2dd8e5",
+      "842df80cda00670855062114b6cf063139d035ab",
       []
      ],
      "access-control-allow-lists.py": [
-      "526d365b3111d46ce723e92f737673afaa300977",
+      "32c11a0c39baa465f3214c37e9a63fa35a3a3862",
       []
      ],
      "access-control-allow-with-body.py": [
-      "7c7f45c69013b90d8db0fdeebe9e14964c0e24fe",
+      "18564e2d44e7f4387487a227cb5e3793d9a4633a",
       []
      ],
      "access-control-auth-basic.py": [
-      "af32aab97cd5ce664a1f1b6fee1b864afc44e351",
+      "d1c5579ce242c67464560ee3e47970c9235dfc1d",
       []
      ],
      "access-control-basic-allow-no-credentials.py": [
-      "12f8660d1fc2636b010a8cd430c028c750f814ba",
+      "1b8bcdb8ae9814fab28449582f5564c7d6dace5d",
       []
      ],
      "access-control-basic-allow-star.py": [
-      "4557c06b0e3a5544b3f70c0c80df8c009b423188",
+      "8d4642d098cac3c6385361d97274a14a96de815c",
       []
      ],
      "access-control-basic-allow.py": [
-      "2325925157c1e5e26d36d77acfdc5f6155199f53",
+      "6051bc2cdc4f68e7ea109fa6d9216b40ff866ee7",
       []
      ],
      "access-control-basic-cors-safelisted-request-headers.py": [
-      "eba0e7d4c5cafc8664c0643b8ad247137374bef2",
+      "46523a905a9f70183d0a5e96cff2d76ad9e6d549",
       []
      ],
      "access-control-basic-denied.py": [
-      "9f8687854598c16a2b893cada9991dca2b02313d",
+      "0d3964cb1157f75bbc59d2fa75c16aa98951a591",
       []
      ],
      "access-control-basic-options-not-supported.py": [
-      "77b274e957ca87270926ad4622d2c79ec9600fed",
+      "bb3f63e311f64455a789f2a316e28a82aa5257b5",
       []
      ],
      "access-control-basic-preflight-cache-invalidation.py": [
-      "6dc8a2a150793b6244fd5fa711bd73c740d59a1e",
+      "f4f592dac79224f51d130a320278c5c038639239",
       []
      ],
      "access-control-basic-preflight-cache-timeout.py": [
-      "a767d8a4a56d36e289f16981edba38054d90adb1",
+      "00c319f082af700d6c5616e489af4f684df6535b",
       []
      ],
      "access-control-basic-preflight-cache.py": [
-      "56892fb6b12c1c9b2f99c57939806f4a84b729d1",
+      "7a6bb60c01a70ca8efd4b20d1f8fccd47ba4228b",
       []
      ],
      "access-control-basic-put-allow.py": [
-      "65f6466f5972d28478687939f6eea9cb428d48c4",
+      "9b347bca4234e5dccbf5f71c3657b1a02d5c7ac6",
       []
      ],
      "access-control-basic-whitelist-response-headers.py": [
-      "4dac75331976ed83432859bbeaceb2a5a648d481",
+      "346b6b919656b23fb911587d447756711a59231e",
       []
      ],
      "access-control-cookie.py": [
-      "1e0d41d22eaa88521f1d21c92f658f0e8522b9b1",
+      "8c26475c387a7de7458060f18adeab3b6429361a",
       []
      ],
      "access-control-origin-header.py": [
-      "f5128776d2b60c7d83907253c6305bf47ed2117f",
+      "e282fe4425004cd1cc82ebd6488f70bec4f4a95d",
       []
      ],
      "access-control-preflight-denied.py": [
-      "e8010cc0ef71d8d1db3c4e381df45b56d541026e",
+      "1ec3037f36b88402e5f59b37b3842d19df10fa29",
       []
      ],
      "access-control-preflight-request-header-lowercase.py": [
-      "d35b89b9f98a669a3946661bd82a51992400c287",
+      "e77fc9a7d2eeaa1dbeb703c760c06c3def42de84",
       []
      ],
      "access-control-preflight-request-header-sorted.py": [
@@ -360807,23 +360893,23 @@
       []
      ],
      "corsenabled.py": [
-      "4a3e1270b65f41acea1c6f2df4d3f1ec9b95eca7",
+      "aae19f18f3c9255d002a2d635f22e733f3f1b354",
       []
      ],
      "delay.py": [
-      "8f97db6f4fc990c654e2e26d2e52d7190dd2af7b",
+      "61a0ed268844841ff0e6a80bd1808c61d144d796",
       []
      ],
      "echo-headers.py": [
-      "8f23d3db019e7cc311bb58cae7d6704ca9402121",
+      "1c5bd46709d4d781ff6da86c9ba04a017356853c",
       []
      ],
      "echo-method.py": [
-      "ccb46b6b2eb4d4b4c281720e0a16142f048ddbc3",
+      "7899c184b768cfba8c50c9d6814ff0058d594cc8",
       []
      ],
      "empty-div-utf8-html.py": [
-      "26d54b9d1496af5fc72a1ba1d2a2ec83c1822f50",
+      "5d4c936590c2086872969d16528e9d0c1314fada",
       []
      ],
      "folder.txt": [
@@ -360831,11 +360917,11 @@
       []
      ],
      "form.py": [
-      "6b1c49a993bfa25ba6c39303880e8860fb3e1489",
+      "c592943b795596c4ebbd06c6ddfc79ed0fad2ec0",
       []
      ],
      "gzip.py": [
-      "f17f92e4cc17792d7b558d1cd4e1e1d76350dd27",
+      "17f142c4405f8e121a2468ffc380a9d56ef0822e",
       []
      ],
      "header-content-length-twice.asis": [
@@ -360847,7 +360933,7 @@
       []
      ],
      "header-user-agent.py": [
-      "4778de40268bd3ca004195fc52fb69af64926c3e",
+      "ac6af13afe0fd6d8d44df51998f84100cf6f3414",
       []
      ],
      "headers-basic.asis": [
@@ -360871,7 +360957,7 @@
       []
      ],
      "headers.py": [
-      "602db35a3cb1e6294a1c8052d84c90a8642d8fda",
+      "00b37c62abc7d7c34ed983f6dadac910bb0ff9f6",
       []
      ],
      "image.gif": [
@@ -360879,7 +360965,7 @@
       []
      ],
      "img-utf8-html.py": [
-      "085867f9510e48fc926650b3e6fbbe62547afbc6",
+      "3057674cb6036a15b7061d65aa2aa7754bb6f8f7",
       []
      ],
      "img.jpg": [
@@ -361515,7 +361601,7 @@
       ]
      ],
      "url-charset.window.js": [
-      "4eb103db35d27af9bef1954ce71f6c9f54c48e20",
+      "777709b64a50e51b9ba37c5ce240073aa4b1f8ef",
       [
        "FileAPI/url/url-charset.window.html",
        {}
@@ -387923,13 +388009,6 @@
        {}
       ]
      ],
-     "display-with-float.html": [
-      "49f94799d93b58c77289d4ac35cb8b7d3239b4fa",
-      [
-       null,
-       {}
-      ]
-     ],
      "inheritance.html": [
       "bfd072651cb6ec82cca7d9be5b6768afbc39fca0",
       [
@@ -389460,6 +389539,13 @@
        {}
       ]
      ],
+     "fontface-load-in-modal-dialog.html": [
+      "8838e05eaf4c3df6d1bc85f782421b15b1e3db76",
+      [
+       null,
+       {}
+      ]
+     ],
      "fontfaceset-load-css-wide-keywords.html": [
       "b85b92bd15e387db3dacd93b325f7f7b4d8d80db",
       [
@@ -395120,6 +395206,20 @@
         {}
        ]
       ],
+      "scrollbar-gutter-invalid.html": [
+       "bfddfcc563064e3ae2db13fd87e75852ed1eef4c",
+       [
+        null,
+        {}
+       ]
+      ],
+      "scrollbar-gutter-valid.html": [
+       "07a5c1acc02c5b7868b13a264334f71a3e2d40e5",
+       [
+        null,
+        {}
+       ]
+      ],
       "text-overflow-computed.html": [
        "60add5dd12d6435377ab039c4401be1de256ddc4",
        [
@@ -404840,6 +404940,13 @@
          {}
         ]
        ],
+       "scrollbar-gutter.html": [
+        "5bf8cb07dd8412f1c709031920b5f7b8ef837957",
+        [
+         null,
+         {}
+        ]
+       ],
        "shape-image-threshold.html": [
         "d16d892c46ade8814540371539ad977b1b1dcc40",
         [
@@ -431637,7 +431744,7 @@
       ]
      ],
      "split-cache.tentative.html": [
-      "ca7cf3c2c06ee7bccd815c926d25b7160be31cf7",
+      "4b04c9ff79bf951cce993c6dbcc556dc1e505c41",
       [
        null,
        {}
@@ -455406,6 +455513,13 @@
          null,
          {}
         ]
+       ],
+       "textarea-scroll-selection.html": [
+        "c8e252f7da6e3dc66691ce10b69528949105a079",
+        [
+         null,
+         {}
+        ]
        ]
       },
       "sequential-focus-navigation-and-the-tabindex-attribute": {
@@ -455952,13 +456066,6 @@
          {}
         ]
        ],
-       "flex-legend-float-abspos.html": [
-        "f6eead471cc076d20839a0e95be01b7742f199fa",
-        [
-         null,
-         {}
-        ]
-       ],
        "legend-align-justify-self.html": [
         "29df29d17778a9d3d592c5e942f093a44f419b3c",
         [
@@ -461381,6 +461488,13 @@
          }
         ]
        ],
+       "jsurl-form-submit.tentative.html": [
+        "f476308b7d98017282545425ab6c530d22da3b52",
+        [
+         null,
+         {}
+        ]
+       ],
        "jsurl-navigation-then-form-submit.html": [
         "93a4ea6004a49175a195e2a7844daeed26c70687",
         [
@@ -465146,13 +465260,6 @@
           {}
          ]
         ],
-        "nested-imports.html": [
-         "23bb595d0ebce1fbe14a3b72ce34fc1efa2720fe",
-         [
-          null,
-          {}
-         ]
-        ],
         "nomodule-attribute.html": [
          "656c99b292ac03f401eead1c4798666de61ca91a",
          [
@@ -473687,7 +473794,7 @@
    },
    "measure-memory": {
     "detached.tentative.window.js": [
-     "87c93160526ec37699c062fea4ab935616b5ee5d",
+     "c6a133cfe456c7c8488ea76d85b903261de206fb",
      [
       "measure-memory/detached.tentative.window.html",
       {
@@ -479372,6 +479479,13 @@
     ]
    },
    "origin-isolation": {
+    "about-blank.https.sub.html": [
+     "ec24853a1605678102d7f025a386c82b44d9af9b",
+     [
+      null,
+      {}
+     ]
+    ],
     "going-back.sub.https.html": [
      "7e95f19366996ce0c97b87631b10d660d07c2e56",
      [
@@ -504924,6 +505038,13 @@
        {}
       ]
      ],
+     "animate-stop-currentcolor.html": [
+      "1536035dec58709256e5d09fec22eae999a0a00d",
+      [
+       null,
+       {}
+      ]
+     ],
      "animateMotion-fill-freeze.html": [
       "4e768efb0046972fdb62f9af6545134d97a9495c",
       [

tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-003.html]
-  [Miss float below something else]
-    expected: FAIL
-

tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-

tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini

@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-

tests/wpt/metadata/css/css-transforms/transform-box/view-box-mutation-001.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-001.html]
+  expected: FAIL

tests/wpt/metadata/css/css-transforms/transform-box/view-box-mutation-002.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-002.html]
+  expected: FAIL

tests/wpt/metadata/css/css-transforms/transform-box/view-box-mutation-003.html.ini

@@ -0,0 +1,2 @@
+[view-box-mutation-003.html]
+  expected: FAIL

tests/wpt/metadata/css/css-transforms/transform-box/view-box-mutation.html.ini

@@ -1,2 +0,0 @@
-[view-box-mutation.html]
-  expected: FAIL

tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini

@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-

tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini

@@ -8,3 +8,6 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
+  [doesn't look up handleEvent method on callable event listeners]
+    expected: FAIL
+

tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini

@@ -1,4 +0,0 @@
-[elementFromPoint-001.html]
-  [CSSOM View - 5 - extensions to the Document interface]
-    expected: FAIL
-

tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini

@@ -21,6 +21,3 @@
   [test the top of layer]
     expected: FAIL
 
-  [test some point of the element: top left corner]
-    expected: FAIL
-

tests/wpt/metadata/custom-elements/reactions/HTMLMediaElement.html.ini

@@ -1,2 +0,0 @@
-[HTMLMediaElement.html]
-  expected: TIMEOUT

tests/wpt/metadata/fetch/content-type/response.window.js.ini

@@ -312,27 +312,24 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/plain */*]
     expected: FAIL
 
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 

tests/wpt/metadata/fetch/content-type/script.window.js.ini

@@ -53,6 +53,3 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-

tests/wpt/metadata/fetch/http-cache/split-cache.tentative.html.ini

@@ -5,3 +5,9 @@
   [HTTP Cache - Partioning by top-level origin 3]
     expected: FAIL
 
+  [HTTP cache is not shared between same-site frames with cross-site top-level frames]
+    expected: FAIL
+
+  [HTTP cache is not shared between cross-site top-level frames]
+    expected: FAIL
+

tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini

@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+

tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini

@@ -1,4 +0,0 @@
-[traverse_the_history_3.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-

tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini

@@ -1,2 +0,0 @@
-[cross-origin-objects-on-new-window.html]
-  expected: TIMEOUT

tests/wpt/metadata/html/interaction/focus/processing-model/textarea-scroll-selection.html.ini

@@ -0,0 +1,4 @@
+[textarea-scroll-selection.html]
+  [programatic focus() scrolls selection into view including ancestors]
+    expected: FAIL
+

tests/wpt/metadata/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/flex-legend-float-abspos.html.ini

@@ -1,13 +0,0 @@
-[flex-legend-float-abspos.html]
-  [dynamic changes to float]
-    expected: FAIL
-
-  [dynamic changes to position]
-    expected: FAIL
-
-  [inserting a new legend and removing it again]
-    expected: FAIL
-
-  [no dynamic changes]
-    expected: FAIL
-

tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini

@@ -1,4 +1,5 @@
 [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
 

tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini

@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
 

tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini

@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 

tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini

@@ -1,4 +0,0 @@
-[form-double-submit-2.html]
-  [preventDefault should allow onclick submit() to succeed]
-    expected: FAIL
-

tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini

@@ -0,0 +1,4 @@
+[form-double-submit-3.html]
+  [<button> should have the same double-submit protection as <input type=submit>]
+    expected: FAIL
+

tests/wpt/metadata/html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html.ini

@@ -0,0 +1,4 @@
+[jsurl-form-submit.tentative.html]
+  [Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.]
+    expected: FAIL
+

tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini

@@ -1,9 +1,10 @@
 [promise-job-entry.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 

tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini

@@ -1,5 +1,4 @@
 [realtimeanalyser-fft-scaling.html]
-  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 

tests/wpt/metadata/webmessaging/with-ports/017.html.ini

@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+

tests/wpt/metadata/webmessaging/with-ports/018.html.ini

@@ -0,0 +1,5 @@
+[018.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, javascript:]
+    expected: TIMEOUT
+

tests/wpt/web-platform-tests/FileAPI/url/url-charset.window.js

@@ -1,4 +1,7 @@
 async_test(t => {
+  // This could be detected as ISO-2022-JP, in which case there would be no
+  // <textarea>, and thus the script inside would be interpreted as actual
+  // script.
   const blob = new Blob(
       [
         `aaa\u001B$@<textarea>\u001B(B<script>/* xss */<\/script></textarea>bbb`
@@ -6,7 +9,9 @@ async_test(t => {
       {type: 'text/html;charset=utf-8'});
   const url = URL.createObjectURL(blob);
   const win = window.open(url);
-  t.add_cleanup(() => win.close());
+  t.add_cleanup(() => {
+    win.close();
+  });
 
   win.onload = t.step_func_done(() => {
     assert_equals(win.document.charset, 'UTF-8');
@@ -19,7 +24,9 @@ async_test(t => {
       {type: 'text/html;charset=utf-8'});
   const url = URL.createObjectURL(blob);
   const win = window.open(url);
-  t.add_cleanup(() => win.close());
+  t.add_cleanup(() => {
+    win.close();
+  });
 
   win.onload = t.step_func_done(() => {
     assert_equals(win.document.charset, 'UTF-8');

tests/wpt/web-platform-tests/css/css-break/trailing-child-margin-000.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/#break-margins">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="columns:2; column-gap:0; width:100px; column-fill:auto; height:100px; background:red;">
+  <div style="display:flow-root; background:green;">
+    <div style="height:70px; margin-bottom:50px;"></div>
+  </div>
+  <!-- We're at the very beginning of the second column here, so inserting a
+       forced break will have no effect. -->
+  <div style="break-before:column; height:100px; background:green;"></div>
+</div>

tests/wpt/web-platform-tests/css/css-break/trailing-child-margin-001.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/#break-margins">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="columns:2; column-gap:0; width:100px; column-fill:auto; height:100px; background:red;">
+  <div style="display:flow-root; background:green;">
+    <div style="height:70px; margin-bottom:50px;"></div>
+    <div style="height:100px;"></div>
+  </div>
+</div>

tests/wpt/web-platform-tests/css/css-break/trailing-child-margin-002.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/#break-margins">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="columns:2; column-gap:0; width:100px; column-fill:auto; height:100px; background:red;">
+  <fieldset style="margin:0; border:none; padding:0; background:green;">
+    <div style="height:70px; margin-bottom:50px;"></div>
+  </fieldset>
+  <div style="break-before:column; height:100px; background:green;"></div>
+</div>

tests/wpt/web-platform-tests/css/css-display/display-with-float.html

@@ -1,24 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Computed float value of flex/grid items</title>
-<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
-<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
-<meta name="assert" content="computed float value of flex/grid items should be as specified">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-
-<div style="display:flex;">
-  <div id="flex-item" style="float:left;"></div>
-</div>
-<div style="display:grid;">
-  <div id="grid-item" style="float:right;"></div>
-</div>
-<script>
-  function getFloatFor(id) {
-    return window.getComputedStyle(document.getElementById(id)).getPropertyValue("float");
-  }
-  test(function() {
-    assert_equals(getFloatFor("flex-item"), "left");
-    assert_equals(getFloatFor("grid-item"), "right");
-  }, "computed style for float");
-</script>

tests/wpt/web-platform-tests/css/css-font-loading/fontface-load-in-modal-dialog.html

@@ -0,0 +1,30 @@
+<!doctype html>
+<link rel="author" title="Xiaocheng Hu" href="xiaochengh@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-font-loading/#font-face-load">
+<link rel="help" href="https://crbug.com/1092411">
+<meta name="assert" content="Ensure that content of a modal dialog is re-rendered with loaded web font." />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+#target {
+  font: 25px/1 custom-font, monospace;
+}
+</style>
+<dialog><span id=target>0123456789</span></dialog>
+<script>
+document.querySelector('dialog').showModal();
+
+function raf() {
+  return new Promise(resolve => requestAnimationFrame(resolve));
+}
+
+promise_test(async () => {
+  await raf();
+
+  const face = new FontFace('custom-font', 'url(/fonts/Ahem.ttf)');
+  document.fonts.add(face);
+  await face.load();
+
+  assert_equals(target.offsetWidth, 250);
+}, 'Modal dialog content should be re-rendered with loaded web font');
+</script>

tests/wpt/web-platform-tests/css/css-overflow/parsing/scrollbar-gutter-invalid.html

@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Overflow: parsing invalid scrollbar-gutter declarations</title>
+<link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@gmail.com"/>
+<link rel="help" href="https://www.w3.org/TR/css-overflow-4/#scollbar-gutter-property"/>
+<meta name="assert" content="Parsing invalid scrollbar-gutter declarations">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+
+<script>
+
+    test_invalid_value("scrollbar-gutter", "auto both");
+    test_invalid_value("scrollbar-gutter", "force auto");
+    test_invalid_value("scrollbar-gutter", "auto always");
+    test_invalid_value("scrollbar-gutter", "always stable");
+    test_invalid_value("scrollbar-gutter", "force");
+    test_invalid_value("scrollbar-gutter", "both");
+    test_invalid_value("scrollbar-gutter", "force both");
+
+    test_invalid_value("scrollbar-gutter", "");
+    test_invalid_value("scrollbar-gutter", "0");
+    test_invalid_value("scrollbar-gutter", "1px");
+    test_invalid_value("scrollbar-gutter", "3em");
+    test_invalid_value("scrollbar-gutter", "1 2 3");
+    test_invalid_value("scrollbar-gutter", "none");
+    test_invalid_value("scrollbar-gutter", "red");
+
+</script>

tests/wpt/web-platform-tests/css/css-overflow/parsing/scrollbar-gutter-valid.html

@@ -0,0 +1,26 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Overflow: parsing valid scrollbar-gutter declarations</title>
+<link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@gmail.com"/>
+<link rel="help" href="https://www.w3.org/TR/css-overflow-4/#scollbar-gutter-property"/>
+<meta name="assert" content="Parsing valid scrollbar-gutter declarations">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+
+<script>
+
+    test_valid_value("scrollbar-gutter", "auto");
+    test_valid_value("scrollbar-gutter", "stable");
+    test_valid_value("scrollbar-gutter", "stable both");
+    test_valid_value("scrollbar-gutter", "stable force");
+    test_valid_value("scrollbar-gutter", "stable both force");
+    test_valid_value("scrollbar-gutter", "always");
+    test_valid_value("scrollbar-gutter", "always both");
+    test_valid_value("scrollbar-gutter", "always force");
+    test_valid_value("scrollbar-gutter", "always both force");
+
+    test_valid_value("scrollbar-gutter", "force both stable", "stable both force");
+    test_valid_value("scrollbar-gutter", "force always both", "always both force");
+
+</script>

tests/wpt/web-platform-tests/css/css-paint-api/paint-function-arguments-ref.html

@@ -32,9 +32,8 @@ function drawCanvas(canvasID, color, width) {
   context.fillRect(40, 40, width, width);
 };
 
-drawCanvas('box-1', 'rgb(50, 100, 150)', '50px');
+drawCanvas('box-1', 'rgb(50, 100, 150)', '50');
-drawCanvas('box-2', 'rgb(150, 100, 50)', '100px');
+drawCanvas('box-2', 'rgb(150, 100, 50)', '100');
-
 </script>
 </body>
 </html>

tests/wpt/web-platform-tests/css/css-paint-api/paint-function-arguments.https.html

@@ -36,7 +36,7 @@ registerPaint('box', class {
     static get inputArguments() { return ['<color>', '<length>']; }
     paint(ctx, geom, properties, args) {
         ctx.fillStyle = args[0].toString();
-        let size = args[1].toString();
+        let size = parseInt(args[1].toString());
         ctx.fillRect(40, 40, size, size);
     }
 });

tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-012.tentative.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: picture</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<picture>
+  <source srcset="support/20x50-green.png">
+  <img style="width: 100px; aspect-ratio: 1/1;">
+</picture>
+

tests/wpt/web-platform-tests/css/css-transforms/transform-box/view-box-mutation-002.html

@@ -0,0 +1,26 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>transform-box: view-box, viewport mutated, &lt;text></title>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="match" href="reference/greensquare200x200.html">
+<link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-box">
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/rendering-utils.js"></script>
+<style>
+#target {
+  transform-box: view-box;
+  transform: translate(-50%, 0);
+}
+</style>
+<p>There should be a green 200x200 rectangle below, and no red.</p>
+<svg width="400" height="200">
+  <rect width="200" height="200" fill="red"/>
+  <text id="target" x="100" y="160" fill="green"
+        font-family="Ahem" font-size="200">X</text>
+</svg>
+<script>
+  waitForAtLeastOneFrame().then(() => {
+    document.querySelector('svg').setAttribute('width', 200);
+    takeScreenshot();
+  });
+</script>

tests/wpt/web-platform-tests/css/css-transforms/transform-box/view-box-mutation-003.html

@@ -0,0 +1,26 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>transform-box: view-box, viewport mutated, &lt;foreignObject></title>
+<link rel="match" href="reference/greensquare200x200.html">
+<link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-box">
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/rendering-utils.js"></script>
+<style>
+#target {
+  transform-box: view-box;
+  transform: translate(-50%, 0);
+}
+</style>
+<p>There should be a green 200x200 rectangle below, and no red.</p>
+<svg width="400" height="200">
+  <rect width="200" height="200" fill="red"/>
+  <foreignObject id="target" x="100" width="200" height="100%">
+    <div style="width: 200px; height: 200px; background-color: green"></div>
+  </foreignObject>
+</svg>
+<script>
+  waitForAtLeastOneFrame().then(() => {
+    document.querySelector('svg').setAttribute('width', 200);
+    takeScreenshot();
+  });
+</script>

tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/scrollbar-gutter.html

@@ -0,0 +1,30 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'display' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('scrollbar-gutter', [
+    { syntax: 'auto' },
+    { syntax: 'stable' },
+    { syntax: 'always' },
+]);
+runUnsupportedPropertyTests('scrollbar-gutter', [
+    'stable both',
+    'stable force',
+    'stable both force',
+    'always both',
+    'always force',
+    'always both force'
+]);
+
+</script>

tests/wpt/web-platform-tests/fetch/http-cache/resources/split-cache-popup-with-iframe.html

@@ -14,7 +14,7 @@
 
   // Create iframe that is same-origin to the opener.
   var iframe = document.createElement("iframe");
-  iframe.src = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') + "split-origin-popup.html";
+  iframe.src = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') + "split-cache-popup.html";
   document.body.appendChild(iframe);
 
   window.addEventListener("message", function listener(event) {

tests/wpt/web-platform-tests/fetch/http-cache/split-cache.tentative.html

@@ -2,7 +2,7 @@
 <html>
 <head>
   <meta charset="utf-8">
-  <title>HTTP Cache - Partioning by top-level origin</title>
+  <title>HTTP Cache - Partioning by site</title>
   <meta name="help" href="https://fetch.spec.whatwg.org/#http-cache-partitions">
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
@@ -15,19 +15,18 @@
 const host = get_host_info();
 
 // We run this entire test four times, varying the following two booleans:
-// - is_same_origin_test, which controls whether the popup is same-origin.
+// - is_cross_site_test, which controls whether the popup is cross-site.
 // - load_resource_in_iframe, which controls whether the popup loads the
-//     resource in an iframe or the mainframe. Note that the iframe is always
+//     resource in an iframe or the top-level frame. Note that the iframe is
-//     same-origin to the opener.
+//     always same-site to the opener.
-function performFullTest(is_same_origin_test, load_resource_in_iframe) {
+function performFullTest(is_cross_site_test, load_resource_in_iframe, name) {
-  const POPUP_HTTP_ORIGIN = is_same_origin_test ? host.HTTP_ORIGIN : host.HTTP_NOTSAMESITE_ORIGIN
+  const POPUP_HTTP_ORIGIN = is_cross_site_test ? host.HTTP_NOTSAMESITE_ORIGIN : host.HTTP_ORIGIN
   const LOCAL_HTTP_ORIGIN = host.HTTP_ORIGIN
 
   const popupBaseURL = POPUP_HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
   const localBaseURL = LOCAL_HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
 
   var test = {
-    name: "HTTP Cache is partitioned by top-frame origin",
     requests: [
       {
         response_headers: [
@@ -45,10 +44,10 @@ function performFullTest(is_same_origin_test, load_resource_in_iframe) {
         // If the popup's request was a cache hit, we would only expect 2
         // requests to the server. If it was a cache miss, we would expect 3.
         // load_resource_in_iframe does not affect the expectation as, even
-        // though the iframe (if present) is same-origin, we expect a cache miss
+        // though the iframe (if present) is same-site, we expect a cache miss
-        // when the popup's mainframe is a different origin.
+        // when the popup's top-level frame is a different site.
         expected_response_headers: [
-          ["server-request-count", is_same_origin_test ? "2" : "3"]
+          ["server-request-count", is_cross_site_test ? "3" : "2"]
         ],
         base_url: localBaseURL
       }
@@ -69,8 +68,8 @@ function performFullTest(is_same_origin_test, load_resource_in_iframe) {
   function popup_fetch() {
     return new Promise(function(resolve, reject) {
       var relativeUrl = load_resource_in_iframe
-          ? "resources/split-origin-popup-with-iframe.html"
+          ? "resources/split-cache-popup-with-iframe.html"
-          : "resources/split-origin-popup.html";
+          : "resources/split-cache-popup.html";
       var win = window.open(popupBaseURL + relativeUrl);
 
       // Post a message to initiate the popup's request and give the necessary
@@ -118,13 +117,26 @@ function performFullTest(is_same_origin_test, load_resource_in_iframe) {
       })
   }
 
-  promise_test(() => local_fetch().then(popup_fetch).then(local_fetch2).then(check_server_info))
+  promise_test(() => {
+    return local_fetch()
+      .then(popup_fetch)
+      .then(local_fetch2)
+      .then(check_server_info)
+  }, name)
 }
 
-performFullTest(true, true);
+performFullTest(
-performFullTest(false, true);
+  false /* is_cross_site_test */, false /* load_resource_in_iframe */,
-performFullTest(true, false);
+  "HTTP cache is shared between same-site top-level frames");
-performFullTest(false, false);
+performFullTest(
+  true /* is_cross_site_test */, false /* load_resource_in_iframe */,
+  "HTTP cache is not shared between cross-site top-level frames");
+performFullTest(
+  false /* is_cross_site_test */, true /* load_resource_in_iframe */,
+  "HTTP cache is shared between same-site frames with same-site top-level frames");
+performFullTest(
+  true /* is_cross_site_test */, true /* load_resource_in_iframe */,
+  "HTTP cache is not shared between same-site frames with cross-site top-level frames");
 </script>
 </body>
 </html>

tests/wpt/web-platform-tests/forced-colors-mode/forced-colors-mode-28-ref.html

@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Forced colors mode - background-image.
+</title>
+<style>
+  body {
+    forced-color-adjust: none;
+  }
+  div {
+    height: 20px;
+    width: 10px;
+  }
+  #div2, #div3 {
+    background-image: url("resources/test-image.jpg");
+  }
+</style>
+<body>
+  The background-image should be reverted in Forced Colors Mode unless the value
+  is a url() function.
+  <div id="div1"></div>
+  <div id="div2"></div>
+  <div id="div3"></div>
+  <div id="div4"></div>
+</body>

tests/wpt/web-platform-tests/forced-colors-mode/forced-colors-mode-28.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Forced colors mode - background-image.
+</title>
+<link rel="help" href="https://www.w3.org/TR/css-color-adjust-1/#forced-colors-properties">
+<link rel=match href="forced-colors-mode-28-ref.html">
+<style>
+  div {
+    height: 20px;
+    width: 10px;
+  }
+  #div1 {
+    background-image: url("resources/test-image.jpg");
+    background-image: linear-gradient(red, yellow);
+  }
+  #div2 {
+    background-image: linear-gradient(red, yellow);
+    background-image: url("resources/test-image.jpg");
+  }
+  #div3 {
+    background-image: url("resources/test-image.jpg");
+  }
+  #div4 {
+    background-image: linear-gradient(red, yellow);
+  }
+</style>
+<body>
+  The background-image should be reverted in Forced Colors Mode unless the value
+  is a url() function.
+  <div id="div1"></div>
+  <div id="div2"></div>
+  <div id="div3"></div>
+  <div id="div4"></div>
+</body>

tests/wpt/web-platform-tests/html/interaction/focus/processing-model/textarea-scroll-selection.html

@@ -0,0 +1,46 @@
+<!doctype html>
+<title>programatic focus() scrolls selection into view including ancestors</title>
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1644366">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div style="overflow: auto; height: 100px">
+  <textarea style="overflow: hidden; height: 200px">
+    Some text
+    That is surely more
+    Than 100px tall
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+    For sure.
+  </textarea>
+</div>
+<script>
+promise_test(async function(t) {
+  await new Promise(resolve => window.addEventListener("load", resolve));
+  let textarea = document.querySelector("textarea");
+  textarea.setSelectionRange(textarea.value.length, textarea.value.length);
+  textarea.focus();
+
+  await new Promise(resolve => {
+    requestAnimationFrame(() => requestAnimationFrame(resolve));
+  });
+
+  assert_not_equals(textarea.parentNode.scrollTop, 0, "Should've scrolled ancestor to show the selection");
+});
+</script>

tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/flex-legend-float-abspos.html

@@ -1,97 +0,0 @@
-<!doctype html>
-<title>
-  legend and float and position: absolute/fixed when the display type of
-  the fieldset is flex.
-</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-<style>
- body { margin: 0; }
- fieldset {
-   border: 10px solid;
-   display: flex;
-   margin: 0;
-   padding: 20px;
-   width: 300px;
- }
- legend { height: 10px; }
- #legend1 { float: left; }
- #legend2 { float: right; }
- #legend3 { position: absolute; }
- #legend4 { position: fixed; }
-</style>
-<fieldset id=fieldset>
-  <div>div</div>
-  <legend id=legend1>legend1</legend>
-  <legend id=legend2>legend2</legend>
-  <legend id=legend3>legend3</legend>
-  <legend id=legend4>legend4</legend>
-  <legend id=legend5>legend5</legend>
-</fieldset>
-<script>
- const fieldset = document.getElementById('fieldset');
- const legends = document.getElementsByTagName('legend');
- const [legend1, legend2, legend3, legend4, legend5] = legends;
- const expectedTop = 0;
- const expectedLeft = 10 + 20;
-
- function assert_rendered_legend(legend) {
-   assert_equals(legend.offsetTop, expectedTop, `${legend.id}.offsetTop`);
-   assert_equals(legend.offsetLeft, expectedLeft, `${legend.id}.offsetLeft`);
-   for (const other of legends) {
-     if (other === legend) {
-       continue;
-     }
-     if (other.offsetTop === expectedTop && other.offsetLeft === expectedLeft) {
-       assert_unreached(`${other.id} should not be the "rendered legend"`);
-     }
-   }
- }
-
- test(t => {
-   assert_rendered_legend(legend5);
- }, 'no dynamic changes');
-
- test(t => {
-   const legend = document.createElement('legend');
-   t.add_cleanup(() => {
-     legend.remove();
-   });
-   legend.id = 'script-inserted';
-   legend.textContent = 'script-inserted legend';
-   fieldset.insertBefore(legend, legend1);
-   assert_rendered_legend(legend);
-   legend.remove();
-   assert_rendered_legend(legend5);
- }, 'inserting a new legend and removing it again');
-
- test(t => {
-   t.add_cleanup(() => {
-     legend1.id = 'legend1';
-     legend2.id = 'legend2';
-   });
-   legend2.id = '';
-   assert_rendered_legend(legend2);
-   legend1.id = '';
-   assert_rendered_legend(legend1);
-   legend1.id = 'legend1';
-   assert_rendered_legend(legend2);
-   legend2.id = 'legend2';
-   assert_rendered_legend(legend5);
- }, 'dynamic changes to float');
-
- test(t => {
-   t.add_cleanup(() => {
-     legend3.id = 'legend3';
-     legend4.id = 'legend4';
-   });
-   legend4.id = '';
-   assert_rendered_legend(legend4);
-   legend3.id = '';
-   assert_rendered_legend(legend3);
-   legend3.id = 'legend3';
-   assert_rendered_legend(legend4);
-   legend4.id = 'legend4';
-   assert_rendered_legend(legend5);
- }, 'dynamic changes to position');
-</script>

tests/wpt/web-platform-tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/input-image-content-crash.html

@@ -0,0 +1,17 @@
+<!doctype html>
+<title>Crash test: asynchronously applying image content to image input</title>
+<link rel="author" href="mailto:yuzhehan@chromium.org" title="Yu Han">
+<link rel="help" href="https://crbug.com/1096002">
+<style>
+  .content { content: url(data:text/plain,aaa); }
+</style>
+<input id="input" type="image">
+<script>
+  onload = ()=> {
+    document.body.offsetTop;
+    input.setAttribute('class', 'content');
+    document.body.offsetTop;
+    input.setAttribute('class', '');
+    document.body.offsetTop;
+  }
+</script>

tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html

@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This behavior is not explicitly specified. -->
+
+<iframe id=frameid name=framename></iframe>
+<form id=formid target=framename action="resources/form.html"></form>
+
+<script>
+async_test(t => {
+  frameid.src = 'resources/jsurl-form-submit-iframe.html';
+
+  frameid.onload = t.step_func(() => {
+    assert_equals(
+      frameid.contentDocument.location.pathname,
+      '/html/semantics/forms/form-submission-0/resources/jsurl-form-submit-iframe.html');
+
+    frameid.onload = t.step_func_done(() => {
+      assert_equals(
+        frameid.contentDocument.location.pathname,
+        '/html/semantics/forms/form-submission-0/resources/form.html');
+    });
+
+    frameid.contentDocument.getElementById('anchorid').click();
+  });
+
+}, `Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.`);
+</script>

tests/wpt/web-platform-tests/html/semantics/forms/form-submission-0/resources/jsurl-form-submit-iframe.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+
+<form id=formid action="form.html"></form>
+<a id=anchorid href="javascript:jsurl()">anchor</a>
+
+<script>
+function jsurl() {
+  formid.submit();
+  return 'jsurl return value';
+}
+</script>

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-a.js

@@ -1 +0,0 @@
-import { b } from "./nested-imports-b.js";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-b.js

@@ -1,2 +0,0 @@
-import { c } from "./nested-imports-c.js";
-export const b = "b";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-c.js

@@ -1,2 +0,0 @@
-import { d } from "./nested-imports-d.js";
-export const c = "c";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-d.js

@@ -1,3 +0,0 @@
-import { e } from "./nested-imports-e.js";
-import "./resources/delayed-modulescript.py";
-export const d = "d";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-e.js

@@ -1,2 +0,0 @@
-import { f } from "./nested-imports-f.js";
-export const e = "e";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-f.js

@@ -1,2 +0,0 @@
-import { g } from "./nested-imports-g.js";
-export const f = "f";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-g.js

@@ -1,2 +0,0 @@
-import { h } from "./nested-imports-h.js";
-export const g = "g";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports-h.js

@@ -1,2 +0,0 @@
-import { c } from "./nested-imports-c.js";
-export const h = "h";

tests/wpt/web-platform-tests/html/semantics/scripting-1/the-script-element/module/nested-imports.html

@@ -1,29 +0,0 @@
-<!DOCTYPE html>
-<title>Test imports under more than 3 levels in different modules</title>
-
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script>
-  setup({ allow_uncaught_exception: true });
-
-  window.log = [];
-
-  const test_load = async_test("should load all modules successfully");
-  window.addEventListener(
-    "load",
-    test_load.step_func_done((ev) => {
-      assert_equals(log.length, 2);
-
-      assert_equals(log[0], 1);
-      assert_equals(log[1], 2);
-    })
-  );
-
-  function unreachable() {
-    log.push("unexpected");
-  }
-</script>
-<script type="module" src="./nested-imports-a.js" onerror="unreachable()"
-    onload="log.push(1)"></script>
-<script type="module" src="./nested-imports-e.js" onerror="unreachable()"
-  onload="log.push(2)"></script>

tests/wpt/web-platform-tests/interfaces/webauthn.idl

@@ -191,3 +191,21 @@ dictionary CredentialPropertiesOutput {
 partial dictionary AuthenticationExtensionsClientOutputs {
     CredentialPropertiesOutput credProps;
 };
+
+partial dictionary AuthenticationExtensionsClientInputs {
+    AuthenticationExtensionsLargeBlobInputs largeBlob;
+};
+
+dictionary AuthenticationExtensionsLargeBlobInputs {
+    boolean read;
+    ArrayBuffer write;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+    AuthenticationExtensionsLargeBlobOutputs largeBlob;
+};
+
+dictionary AuthenticationExtensionsLargeBlobOutputs {
+    ArrayBuffer blob;
+    boolean written;
+};

tests/wpt/web-platform-tests/measure-memory/detached.tentative.window.js

@@ -66,6 +66,7 @@ promise_test(async testCase => {
     iframes['same-origin-3'].src,
     iframes['same-origin-4'].src,
     iframes['cross-origin-5'].src,
+    iframes['same-origin-8'].sec,
     windows['same-origin-7'].location.href,
     windows['same-origin-12'].location.href,
   ];
@@ -89,11 +90,17 @@ promise_test(async testCase => {
   // 2) By closing the window:
   windows['cross-origin-9'].close();
 
+  await waitForMessage('cross-site-1');
+  await waitForMessage('same-origin-3');
+  await waitForMessage('same-origin-7');
+
   try {
     const result = await performance.measureMemory();
     checkMeasureMemory(result, {
       allowed: allowed.concat([
         iframes['cross-site-1'].src,
+        iframes['same-origin-3'].contentWindow.location.href,
+        windows['same-origin-7'].location.href,
       ]),
       required: [
         window.location.href,

tests/wpt/web-platform-tests/origin-isolation/about-blank.https.sub.html

@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>The initial about:blank respects origin isolation</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id="log"></div>
+
+<script type="module">
+import {
+  insertIframe,
+  setBothDocumentDomains,
+  testSameAgentCluster,
+  testDifferentAgentClusters
+} from "./resources/helpers.mjs";
+
+promise_setup(async () => {
+  await insertAboutBlankIframe();
+  await insertIframe("{{hosts[][www]}}");
+});
+
+// Since the initial about:blank inherits its origin from its parent, it is
+// same-origin with the parent, and thus cross-origin with child2.
+testSameAgentCluster([self, 0], "parent to about:blank");
+testDifferentAgentClusters([0, 1], "about:blank to child2");
+testDifferentAgentClusters([1, 0], "child2 to about:blank");
+
+async function insertAboutBlankIframe() {
+  const iframe = document.createElement("iframe");
+  document.body.append(iframe);
+
+  // Now use document.write() to get the child frame script in there, without
+  // actually navigating anywhere.
+  // We need to absolutize the URL to since about:blank doesn't have a base URL.
+  const scriptURL = (new URL("./resources/child-frame-script.mjs", import.meta.url)).href;
+  iframe.contentDocument.write(`<script type="module" src="${scriptURL}"></scr` + `ipt>`);
+  iframe.contentDocument.close();
+
+  await new Promise((resolve, reject) => {
+    // Note that since this code runs during the same event loop turn as the
+    // contentDocument.write() above, we know that the load/error events will
+    // not have been fired at this time. (The spec guarantees they are fired
+    // from queued tasks.)
+    const script = iframe.contentDocument.querySelector("script");
+    script.onload = resolve;
+    script.onerror = () => reject(
+      new Error("Could not load the child frame script into the about:blank page")
+    );
+  });
+
+  await setBothDocumentDomains(iframe.contentWindow);
+}
+</script>

tests/wpt/web-platform-tests/origin-isolation/about-blank.https.sub.html.headers

@@ -0,0 +1 @@
+Origin-Isolation: ?1

tests/wpt/web-platform-tests/origin-isolation/resources/child-frame-script.mjs

@@ -0,0 +1,43 @@
+import { sendWasmModule } from "./helpers.mjs";
+
+window.onmessage = async (e) => {
+  // These could come from the parent or siblings.
+  if (e.data.constructor === WebAssembly.Module) {
+    e.source.postMessage("WebAssembly.Module message received", "*");
+  }
+
+  // These only come from the parent.
+  if (e.data.command === "set document.domain") {
+    document.domain = e.data.newDocumentDomain;
+    parent.postMessage("document.domain is set", "*");
+  } else if (e.data.command === "send WASM module") {
+    const destinationFrameWindow = parent.frames[e.data.indexIntoParentFrameOfDestination];
+    const whatHappened = await sendWasmModule(destinationFrameWindow);
+    parent.postMessage(whatHappened, "*");
+  } else if (e.data.command === "access document") {
+    const destinationFrameWindow = parent.frames[e.data.indexIntoParentFrameOfDestination];
+    try {
+      destinationFrameWindow.document;
+      parent.postMessage("accessed document successfully", "*");
+    } catch (e) {
+      parent.postMessage(e.name, "*");
+    }
+  } else if (e.data.command === "access location.href") {
+    const destinationFrameWindow = parent.frames[e.data.indexIntoParentFrameOfDestination];
+    try {
+      destinationFrameWindow.location.href;
+      parent.postMessage("accessed location.href successfully", "*");
+    } catch (e) {
+      parent.postMessage(e.name, "*");
+    }
+  }
+
+  // We could also receive e.data === "WebAssembly.Module message received",
+  // but that's handled by await sendWasmModule() above.
+};
+
+window.onmessageerror = e => {
+  e.source.postMessage("messageerror", "*");
+};
+
+document.body.textContent = location.href;