diff --git a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
index 6a3af4e2ece..947e223fb28 100644
--- a/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini
@@ -14,9 +14,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
-  [Revoke blob URL after calling fetch, fetch should succeed]
-    expected: FAIL
-
 
 [url-with-fetch.any.html]
   [Untitled]
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index beb4a66e0be..5f2f94c5c09 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -11263,6 +11263,18 @@
      {}
     ]
    ],
+   "css/selectors/focus-visible-008-manual.html": [
+    [
+     "css/selectors/focus-visible-008-manual.html",
+     {}
+    ]
+   ],
+   "css/selectors/focus-visible-012-manual.html": [
+    [
+     "css/selectors/focus-visible-012-manual.html",
+     {}
+    ]
+   ],
    "css/selectors/hover-001-manual.html": [
     [
      "css/selectors/hover-001-manual.html",
@@ -20109,6 +20121,18 @@
      {}
     ]
    ],
+   "compat/webkit-box-fieldset.html": [
+    [
+     "compat/webkit-box-fieldset.html",
+     [
+      [
+       "/compat/webkit-box-fieldset-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "compat/webkit-linear-gradient-line-bottom.html": [
     [
      "compat/webkit-linear-gradient-line-bottom.html",
@@ -130339,6 +130363,18 @@
      {}
     ]
    ],
+   "css/css-lists/list-style-type-string-007.html": [
+    [
+     "css/css-lists/list-style-type-string-007.html",
+     [
+      [
+       "/css/css-lists/list-style-type-string-007-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-lists/list-type-none-style-image.html": [
     [
      "css/css-lists/list-type-none-style-image.html",
@@ -210810,6 +210846,9 @@
    ".github/workflows/documentation.yml": [
     []
    ],
+   ".github/workflows/epochs.yml": [
+    []
+   ],
    ".github/workflows/manifest.yml": [
     []
    ],
@@ -211854,6 +211893,9 @@
    "WebIDL/testable_assertions.txt": [
     []
    ],
+   "WebIDL/tools/generate-setlike.py": [
+    []
+   ],
    "WebIDL/valid/idl/allowany.widl": [
     []
    ],
@@ -211959,6 +212001,36 @@
    "WebIDL/valid/idl/serializer.widl": [
     []
    ],
+   "WebIDL/valid/idl/setlike-add.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-clear.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-delete.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-entries.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-forEach.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-has.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-keys.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-size.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike-values.widl": [
+    []
+   ],
+   "WebIDL/valid/idl/setlike.widl": [
+    []
+   ],
    "WebIDL/valid/idl/static.widl": [
     []
    ],
@@ -214263,6 +214335,9 @@
    "compat/webkit-background-origin-text-ref.html": [
     []
    ],
+   "compat/webkit-box-fieldset-ref.html": [
+    []
+   ],
    "compat/webkit-text-fill-color-property-001-ref.html": [
     []
    ],
@@ -250803,6 +250878,9 @@
    "css/css-grid/alignment/support/style-change.js": [
     []
    ],
+   "css/css-grid/alignment/support/width-keyword-classes.css": [
+    []
+   ],
    "css/css-grid/animation/grid-template-columns-001-ref.html": [
     []
    ],
@@ -251445,6 +251523,9 @@
    "css/css-lists/list-style-type-string-006-ref.html": [
     []
    ],
+   "css/css-lists/list-style-type-string-007-ref.html": [
+    []
+   ],
    "css/css-lists/list-type-none-style-image-ref.html": [
     []
    ],
@@ -274056,6 +274137,9 @@
    "images/wpt-logo/wpt-logo-white.svg": [
     []
    ],
+   "images/wpt-pr-bot-logo/wpt-pr-bot-logo-darkblue.svg": [
+    []
+   ],
    "images/yellow.png": [
     []
    ],
@@ -276330,6 +276414,30 @@
    "native-file-system/README.md": [
     []
    ],
+   "native-file-system/resources/message-target-dedicated-worker.js": [
+    []
+   ],
+   "native-file-system/resources/message-target-service-worker.js": [
+    []
+   ],
+   "native-file-system/resources/message-target-shared-worker.js": [
+    []
+   ],
+   "native-file-system/resources/message-target.html": [
+    []
+   ],
+   "native-file-system/resources/message-target.js": [
+    []
+   ],
+   "native-file-system/resources/messaging-blob-helpers.js": [
+    []
+   ],
+   "native-file-system/resources/messaging-helpers.js": [
+    []
+   ],
+   "native-file-system/resources/messaging-serialize-helpers.js": [
+    []
+   ],
    "native-file-system/resources/native-fs-test-helpers.js": [
     []
    ],
@@ -276339,6 +276447,18 @@
    "native-file-system/resources/test-helpers.js": [
     []
    ],
+   "native-file-system/script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js": [
+    []
+   ],
+   "native-file-system/script-tests/FileSystemBaseHandle-postMessage-Error.js": [
+    []
+   ],
+   "native-file-system/script-tests/FileSystemBaseHandle-postMessage-MessagePort.js": [
+    []
+   ],
+   "native-file-system/script-tests/FileSystemBaseHandle-postMessage.js": [
+    []
+   ],
    "native-file-system/script-tests/FileSystemDirectoryHandle-getDirectory.js": [
     []
    ],
@@ -280464,6 +280584,9 @@
    "service-workers/service-worker/ServiceWorkerGlobalScope/resources/update-worker.py": [
     []
    ],
+   "service-workers/service-worker/fetch-error-worker.js": [
+    []
+   ],
    "service-workers/service-worker/multi-globals/current/current.https.html": [
     []
    ],
@@ -282516,6 +282639,9 @@
    "tools/ci/commands.json": [
     []
    ],
+   "tools/ci/epochs_update.sh": [
+    []
+   ],
    "tools/ci/jobs.py": [
     []
    ],
@@ -309848,9 +309974,9 @@
      {}
     ]
    ],
-   "compression/compression-bad-chunks.any.js": [
+   "compression/compression-bad-chunks.tentative.any.js": [
     [
-     "compression/compression-bad-chunks.any.html",
+     "compression/compression-bad-chunks.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -309861,7 +309987,7 @@
      }
     ],
     [
-     "compression/compression-bad-chunks.any.serviceworker.html",
+     "compression/compression-bad-chunks.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -309872,7 +309998,7 @@
      }
     ],
     [
-     "compression/compression-bad-chunks.any.sharedworker.html",
+     "compression/compression-bad-chunks.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -309883,7 +310009,7 @@
      }
     ],
     [
-     "compression/compression-bad-chunks.any.worker.html",
+     "compression/compression-bad-chunks.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -309894,9 +310020,9 @@
      }
     ]
    ],
-   "compression/compression-including-empty-chunk.any.js": [
+   "compression/compression-including-empty-chunk.tentative.any.js": [
     [
-     "compression/compression-including-empty-chunk.any.html",
+     "compression/compression-including-empty-chunk.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -309916,7 +310042,7 @@
      }
     ],
     [
-     "compression/compression-including-empty-chunk.any.serviceworker.html",
+     "compression/compression-including-empty-chunk.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -309936,7 +310062,7 @@
      }
     ],
     [
-     "compression/compression-including-empty-chunk.any.sharedworker.html",
+     "compression/compression-including-empty-chunk.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -309956,7 +310082,7 @@
      }
     ],
     [
-     "compression/compression-including-empty-chunk.any.worker.html",
+     "compression/compression-including-empty-chunk.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -309976,9 +310102,9 @@
      }
     ]
    ],
-   "compression/compression-multiple-chunks.any.js": [
+   "compression/compression-multiple-chunks.tentative.any.js": [
     [
-     "compression/compression-multiple-chunks.any.html",
+     "compression/compression-multiple-chunks.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -309998,7 +310124,7 @@
      }
     ],
     [
-     "compression/compression-multiple-chunks.any.serviceworker.html",
+     "compression/compression-multiple-chunks.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310018,7 +310144,7 @@
      }
     ],
     [
-     "compression/compression-multiple-chunks.any.sharedworker.html",
+     "compression/compression-multiple-chunks.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310038,7 +310164,7 @@
      }
     ],
     [
-     "compression/compression-multiple-chunks.any.worker.html",
+     "compression/compression-multiple-chunks.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310058,9 +310184,9 @@
      }
     ]
    ],
-   "compression/compression-output-length.any.js": [
+   "compression/compression-output-length.tentative.any.js": [
     [
-     "compression/compression-output-length.any.html",
+     "compression/compression-output-length.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310071,7 +310197,7 @@
      }
     ],
     [
-     "compression/compression-output-length.any.serviceworker.html",
+     "compression/compression-output-length.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310082,7 +310208,7 @@
      }
     ],
     [
-     "compression/compression-output-length.any.sharedworker.html",
+     "compression/compression-output-length.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310093,7 +310219,7 @@
      }
     ],
     [
-     "compression/compression-output-length.any.worker.html",
+     "compression/compression-output-length.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310104,9 +310230,9 @@
      }
     ]
    ],
-   "compression/compression-stream.any.js": [
+   "compression/compression-stream.tentative.any.js": [
     [
-     "compression/compression-stream.any.html",
+     "compression/compression-stream.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310126,7 +310252,7 @@
      }
     ],
     [
-     "compression/compression-stream.any.serviceworker.html",
+     "compression/compression-stream.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310146,7 +310272,7 @@
      }
     ],
     [
-     "compression/compression-stream.any.sharedworker.html",
+     "compression/compression-stream.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310166,7 +310292,7 @@
      }
     ],
     [
-     "compression/compression-stream.any.worker.html",
+     "compression/compression-stream.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310186,9 +310312,9 @@
      }
     ]
    ],
-   "compression/decompression-bad-chunks.any.js": [
+   "compression/decompression-bad-chunks.tentative.any.js": [
     [
-     "compression/decompression-bad-chunks.any.html",
+     "compression/decompression-bad-chunks.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310199,7 +310325,7 @@
      }
     ],
     [
-     "compression/decompression-bad-chunks.any.serviceworker.html",
+     "compression/decompression-bad-chunks.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310210,7 +310336,7 @@
      }
     ],
     [
-     "compression/decompression-bad-chunks.any.sharedworker.html",
+     "compression/decompression-bad-chunks.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310221,7 +310347,7 @@
      }
     ],
     [
-     "compression/decompression-bad-chunks.any.worker.html",
+     "compression/decompression-bad-chunks.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310232,9 +310358,9 @@
      }
     ]
    ],
-   "compression/decompression-buffersource.any.js": [
+   "compression/decompression-buffersource.tentative.any.js": [
     [
-     "compression/decompression-buffersource.any.html",
+     "compression/decompression-buffersource.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310245,7 +310371,7 @@
      }
     ],
     [
-     "compression/decompression-buffersource.any.serviceworker.html",
+     "compression/decompression-buffersource.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310256,7 +310382,7 @@
      }
     ],
     [
-     "compression/decompression-buffersource.any.sharedworker.html",
+     "compression/decompression-buffersource.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310267,7 +310393,7 @@
      }
     ],
     [
-     "compression/decompression-buffersource.any.worker.html",
+     "compression/decompression-buffersource.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310278,9 +310404,9 @@
      }
     ]
    ],
-   "compression/decompression-constructor-error.any.js": [
+   "compression/decompression-constructor-error.tentative.any.js": [
     [
-     "compression/decompression-constructor-error.any.html",
+     "compression/decompression-constructor-error.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310291,7 +310417,7 @@
      }
     ],
     [
-     "compression/decompression-constructor-error.any.serviceworker.html",
+     "compression/decompression-constructor-error.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310302,7 +310428,7 @@
      }
     ],
     [
-     "compression/decompression-constructor-error.any.sharedworker.html",
+     "compression/decompression-constructor-error.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310313,7 +310439,7 @@
      }
     ],
     [
-     "compression/decompression-constructor-error.any.worker.html",
+     "compression/decompression-constructor-error.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310324,9 +310450,9 @@
      }
     ]
    ],
-   "compression/decompression-correct-input.any.js": [
+   "compression/decompression-correct-input.tentative.any.js": [
     [
-     "compression/decompression-correct-input.any.html",
+     "compression/decompression-correct-input.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310337,7 +310463,7 @@
      }
     ],
     [
-     "compression/decompression-correct-input.any.serviceworker.html",
+     "compression/decompression-correct-input.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310348,7 +310474,7 @@
      }
     ],
     [
-     "compression/decompression-correct-input.any.sharedworker.html",
+     "compression/decompression-correct-input.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310359,7 +310485,7 @@
      }
     ],
     [
-     "compression/decompression-correct-input.any.worker.html",
+     "compression/decompression-correct-input.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310370,9 +310496,9 @@
      }
     ]
    ],
-   "compression/decompression-empty-input.any.js": [
+   "compression/decompression-empty-input.tentative.any.js": [
     [
-     "compression/decompression-empty-input.any.html",
+     "compression/decompression-empty-input.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310383,7 +310509,7 @@
      }
     ],
     [
-     "compression/decompression-empty-input.any.serviceworker.html",
+     "compression/decompression-empty-input.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310394,7 +310520,7 @@
      }
     ],
     [
-     "compression/decompression-empty-input.any.sharedworker.html",
+     "compression/decompression-empty-input.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310405,7 +310531,7 @@
      }
     ],
     [
-     "compression/decompression-empty-input.any.worker.html",
+     "compression/decompression-empty-input.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310416,9 +310542,9 @@
      }
     ]
    ],
-   "compression/decompression-split-chunk.any.js": [
+   "compression/decompression-split-chunk.tentative.any.js": [
     [
-     "compression/decompression-split-chunk.any.html",
+     "compression/decompression-split-chunk.tentative.any.html",
      {
       "script_metadata": [
        [
@@ -310429,7 +310555,7 @@
      }
     ],
     [
-     "compression/decompression-split-chunk.any.serviceworker.html",
+     "compression/decompression-split-chunk.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
@@ -310440,7 +310566,7 @@
      }
     ],
     [
-     "compression/decompression-split-chunk.any.sharedworker.html",
+     "compression/decompression-split-chunk.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
@@ -310451,7 +310577,7 @@
      }
     ],
     [
-     "compression/decompression-split-chunk.any.worker.html",
+     "compression/decompression-split-chunk.tentative.any.worker.html",
      {
       "script_metadata": [
        [
@@ -310462,49 +310588,69 @@
      }
     ]
    ],
-   "compression/decompression-uint8array-output.any.js": [
+   "compression/decompression-uint8array-output.tentative.any.js": [
     [
-     "compression/decompression-uint8array-output.any.html",
+     "compression/decompression-uint8array-output.tentative.any.html",
      {
       "script_metadata": [
        [
         "global",
         "worker"
+       ],
+       [
+        "timeout",
+        "long"
        ]
-      ]
+      ],
+      "timeout": "long"
      }
     ],
     [
-     "compression/decompression-uint8array-output.any.serviceworker.html",
+     "compression/decompression-uint8array-output.tentative.any.serviceworker.html",
      {
       "script_metadata": [
        [
         "global",
         "worker"
+       ],
+       [
+        "timeout",
+        "long"
        ]
-      ]
+      ],
+      "timeout": "long"
      }
     ],
     [
-     "compression/decompression-uint8array-output.any.sharedworker.html",
+     "compression/decompression-uint8array-output.tentative.any.sharedworker.html",
      {
       "script_metadata": [
        [
         "global",
         "worker"
+       ],
+       [
+        "timeout",
+        "long"
        ]
-      ]
+      ],
+      "timeout": "long"
      }
     ],
     [
-     "compression/decompression-uint8array-output.any.worker.html",
+     "compression/decompression-uint8array-output.tentative.any.worker.html",
      {
       "script_metadata": [
        [
         "global",
         "worker"
+       ],
+       [
+        "timeout",
+        "long"
        ]
-      ]
+      ],
+      "timeout": "long"
      }
     ]
    ],
@@ -318722,6 +318868,12 @@
      {}
     ]
    ],
+   "css/css-grid/alignment/grid-align-justify-stretch.html": [
+    [
+     "css/css-grid/alignment/grid-align-justify-stretch.html",
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-alignment-implies-size-change-001.html": [
     [
      "css/css-grid/alignment/grid-alignment-implies-size-change-001.html",
@@ -331190,6 +331342,12 @@
      {}
     ]
    ],
+   "css/cssom-view/MediaQueryListEvent.html": [
+    [
+     "css/cssom-view/MediaQueryListEvent.html",
+     {}
+    ]
+   ],
    "css/cssom-view/Screen-pixelDepth-Screen-colorDepth001.html": [
     [
      "css/cssom-view/Screen-pixelDepth-Screen-colorDepth001.html",
@@ -333148,12 +333306,6 @@
      }
     ]
    ],
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@@ -370143,6 +370295,12 @@
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@@ -373148,6 +373306,154 @@
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+     "native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.manual.window.html",
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+        "/service-workers/service-worker/resources/test-helpers.sub.js"
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+        "resources/test-helpers.js"
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+        "script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js"
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+        "script-tests/FileSystemBaseHandle-postMessage-Error.js"
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@@ -373298,6 +373604,154 @@
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@@ -402885,6 +403339,12 @@
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@@ -456236,7 +456696,7 @@
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@@ -463039,6 +463503,10 @@
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@@ -463179,6 +463647,46 @@
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@@ -468227,6 +468735,14 @@
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@@ -573479,6 +573995,10 @@
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@@ -574567,6 +575087,10 @@
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+  "css/css-grid/alignment/support/width-keyword-classes.css": [
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@@ -577643,6 +578167,14 @@
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@@ -614847,6 +615379,10 @@
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@@ -618163,6 +618699,10 @@
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@@ -659751,6 +660291,10 @@
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   ],
+  "images/wpt-pr-bot-logo/wpt-pr-bot-logo-darkblue.svg": [
+   "d6712fa23c9199d8b67f63c7ca3c555b915d2d58",
+   "support"
+  ],
   "images/yellow.png": [
    "51e8aaf38c1b3a105fc6038c93b5648a4bf9efd4",
    "support"
@@ -660720,7 +661264,7 @@
    "support"
   ],
   "interfaces/credential-management.idl": [
-   "da1b9dfca6909eab1e3c7fd5e16f1391d69f9dcb",
+   "d097dd084b64dcdd1776a2bb86809e50275d337a",
    "support"
   ],
   "interfaces/csp-embedded-enforcement.idl": [
@@ -664283,6 +664827,10 @@
    "a86e0a077851a84f704e2aa4df1d526ecd9a55b2",
    "support"
   ],
+  "mediacapture-streams/MediaDevices-enumerateDevices-returned-objects.https.html": [
+   "177beb6c2b941e8721a618fc706a922dc1f52291",
+   "testharness"
+  ],
   "mediacapture-streams/MediaDevices-enumerateDevices.https.html": [
    "efb460731690df01e3b53d15eb4d097f2d16b106",
    "testharness"
@@ -667099,6 +667647,22 @@
    "6905a68e7901ce26bc1a363062304e1536604400",
    "support"
   ],
+  "native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.manual.window.js": [
+   "4bfe84e9c4abf8738002168832fe59b7e6d72896",
+   "testharness"
+  ],
+  "native-file-system/native_FileSystemBaseHandle-postMessage-Error.tentative.https.manual.window.js": [
+   "e45271c779341513de5a4400560012d68998f8dd",
+   "testharness"
+  ],
+  "native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.manual.window.js": [
+   "408b32f13a317e060e88baee4ccca6a5f292a3a4",
+   "testharness"
+  ],
+  "native-file-system/native_FileSystemBaseHandle-postMessage.tentative.https.manual.window.js": [
+   "6045812bff57037de8b1f4972059e8d8e0ee06db",
+   "testharness"
+  ],
   "native-file-system/native_FileSystemDirectoryHandle-getDirectory.tentative.https.manual.window.js": [
    "cfe729cd1f1dd4b53f00b3b13cd53f64f84ca409",
    "testharness"
@@ -667123,6 +667687,38 @@
    "25d8ee995857fa67be2c41f048e882ec473f739d",
    "testharness"
   ],
+  "native-file-system/resources/message-target-dedicated-worker.js": [
+   "26ff23ef8ac65009c3c5efd4bdeda3970ae93910",
+   "support"
+  ],
+  "native-file-system/resources/message-target-service-worker.js": [
+   "4a6174ae3b5539300954f6f36782a96a066b4889",
+   "support"
+  ],
+  "native-file-system/resources/message-target-shared-worker.js": [
+   "6829c61d4cf9f32f4834ae09ffba1d614b0430a0",
+   "support"
+  ],
+  "native-file-system/resources/message-target.html": [
+   "32c7f0c56c61d4d2f6e432dd3c38f8afe91f9762",
+   "support"
+  ],
+  "native-file-system/resources/message-target.js": [
+   "b9c0e4f8565e647577cad859129257fa447bd8dc",
+   "support"
+  ],
+  "native-file-system/resources/messaging-blob-helpers.js": [
+   "852f2e2d3213075ce738fbc2bb5ac4a1f4008ad6",
+   "support"
+  ],
+  "native-file-system/resources/messaging-helpers.js": [
+   "aae6e25d861c6c207133ebdf3778c134aee8c4e6",
+   "support"
+  ],
+  "native-file-system/resources/messaging-serialize-helpers.js": [
+   "4a4b350cf91c3cc3555bdc133a36f415e7f7b5c3",
+   "support"
+  ],
   "native-file-system/resources/native-fs-test-helpers.js": [
    "5ad8c04724b7a2e7743b43a84efaa05b7e6b703d",
    "support"
@@ -667135,6 +667731,22 @@
    "d0360921f1d8ce7257bd7d6586d333b8534c620d",
    "support"
   ],
+  "native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js": [
+   "1995ab9b1f99aefa5715f36fec3a83e3efd72d3f",
+   "testharness"
+  ],
+  "native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js": [
+   "f44957e2000143509206c93e9c334cb401e4a173",
+   "testharness"
+  ],
+  "native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.window.js": [
+   "043c6b392622df65a7ad92f422bc74a5c8329ee2",
+   "testharness"
+  ],
+  "native-file-system/sandboxed_FileSystemBaseHandle-postMessage.tentative.https.window.js": [
+   "e010f6599e890f0eeaffd01a4bae962a8aa8b950",
+   "testharness"
+  ],
   "native-file-system/sandboxed_FileSystemDirectoryHandle-getDirectory.tentative.https.any.js": [
    "6fcf566e31fbf061e7545280198562d9e41cad11",
    "testharness"
@@ -667159,6 +667771,22 @@
    "8352e2487fe0823a2d353372757d833d85e98c4b",
    "testharness"
   ],
+  "native-file-system/script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js": [
+   "7daf65e39b6f7776c46eb90d671c192b0ba4aca0",
+   "support"
+  ],
+  "native-file-system/script-tests/FileSystemBaseHandle-postMessage-Error.js": [
+   "914b47bcf4060131efd6f47777681add302607ab",
+   "support"
+  ],
+  "native-file-system/script-tests/FileSystemBaseHandle-postMessage-MessagePort.js": [
+   "aa1e9b200c806d3bb4e4360178c042aa66e4ac8c",
+   "support"
+  ],
+  "native-file-system/script-tests/FileSystemBaseHandle-postMessage.js": [
+   "d2b333a9057d017dc56880d4899b004cdc2bc86e",
+   "support"
+  ],
   "native-file-system/script-tests/FileSystemDirectoryHandle-getDirectory.js": [
    "c2c128f5eded06f440e634051fac021e20061e0d",
    "support"
@@ -691807,6 +692435,14 @@
    "4f176220d6100c4efb1bfda817b84cf5f53a4f3d",
    "testharness"
   ],
+  "service-workers/service-worker/fetch-error-worker.js": [
+   "788252cf3b3b3e5aaaf7013abd2d6940f298a40e",
+   "support"
+  ],
+  "service-workers/service-worker/fetch-error.https.html": [
+   "901c158f60197e92ec7eaa78989a8ce799e2d8c0",
+   "testharness"
+  ],
   "service-workers/service-worker/fetch-event-add-async.https.html": [
    "ac13e4f41675c22669862751b9209835d7210231",
    "testharness"
@@ -700543,6 +701179,10 @@
    "841fd855c8056829afd347e3067e55804ca65139",
    "support"
   ],
+  "tools/ci/epochs_update.sh": [
+   "c95f9ca0f13481589ee1358c7ad8fdf94d13328b",
+   "support"
+  ],
   "tools/ci/jobs.py": [
    "b7ada2a5b621236d97d4e87a8d7e0960327bc01d",
    "support"
@@ -706916,7 +707556,7 @@
    "support"
   ],
   "update-built-tests.sh": [
-   "3cb6dc0f0e6efc1db6b3c38740a86572ed2474a3",
+   "1a33154898d7adfdff6194d4632b28548cc4c9f8",
    "support"
   ],
   "upgrade-insecure-requests/META.yml": [
@@ -722304,7 +722944,7 @@
    "testharness"
   ],
   "workers/semantics/interface-objects/003.any.js": [
-   "1942a4658dfb8e2ecab52c914af9aff8cf79cc2a",
+   "ea95deda29889254e0e1c83bebb58cdc04363c2d",
    "testharness"
   ],
   "workers/semantics/interface-objects/004.any.js": [
diff --git a/tests/wpt/metadata/css/css-flexbox/quirks-auto-block-size-with-percentage-item.html.ini b/tests/wpt/metadata/css/css-flexbox/quirks-auto-block-size-with-percentage-item.html.ini
deleted file mode 100644
index 354df228b5f..00000000000
--- a/tests/wpt/metadata/css/css-flexbox/quirks-auto-block-size-with-percentage-item.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[quirks-auto-block-size-with-percentage-item.html]
-  [#container 1]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/matchMediaAddListener-handleEvent.html.ini b/tests/wpt/metadata/css/cssom-view/matchMediaAddListener-handleEvent.html.ini
index f565b726231..176c9ea4568 100644
--- a/tests/wpt/metadata/css/cssom-view/matchMediaAddListener-handleEvent.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/matchMediaAddListener-handleEvent.html.ini
@@ -8,9 +8,3 @@
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
 
-  [doesn't look up handleEvent method on callable event listeners]
-    expected: FAIL
-
-  [looks up handleEvent method on every event dispatch]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/selectors/focus-visible-008.html.ini b/tests/wpt/metadata/css/selectors/focus-visible-008.html.ini
deleted file mode 100644
index 745d5f69d23..00000000000
--- a/tests/wpt/metadata/css/selectors/focus-visible-008.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[focus-visible-008.html]
-  [CSS Test (Selectors): Keyboard focus enables :focus-visible]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 3ecb2db98ba..e2f972c78f2 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -321,3 +321,15 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 279734168dc..d2df9b78483 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,6 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252  text/javascript]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html.ini b/tests/wpt/metadata/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html.ini
index 177e006d0cf..85122a4d412 100644
--- a/tests/wpt/metadata/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html.ini
+++ b/tests/wpt/metadata/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html.ini
@@ -1,2 +1,19 @@
 [script-resource-with-nonsniffable-types.tentative.sub.html]
-  expected: TIMEOUT
+  [CORB blocks 'multipart/byteranges']
+    expected: FAIL
+
+  [CORB blocks 'application/gzip']
+    expected: FAIL
+
+  [CORB blocks 'application/x-protobuf']
+    expected: FAIL
+
+  [CORB blocks 'application/zip']
+    expected: FAIL
+
+  [CORB blocks 'text/event-stream']
+    expected: FAIL
+
+  [CORB blocks 'application/x-gzip']
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html.ini b/tests/wpt/metadata/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html.ini
index 6b117e1204f..78170169bfc 100644
--- a/tests/wpt/metadata/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html.ini
+++ b/tests/wpt/metadata/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html.ini
@@ -1,4 +1,17 @@
 [redirect-https-downgrade.tentative.sub.html]
+  expected: ERROR
   [redirect-https-downgrade]
     expected: FAIL
 
+  [Https downgrade fetch() api]
+    expected: NOTRUN
+
+  [Https downgrade script => No headers]
+    expected: FAIL
+
+  [Https downgrade object]
+    expected: NOTRUN
+
+  [Https downgrade embed]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini b/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
index 7bc8170f869..6bd06899fdd 100644
--- a/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
+++ b/tests/wpt/metadata/fetch/security/embedded-credentials.tentative.sub.html.ini
@@ -1,6 +1,6 @@
 [embedded-credentials.tentative.sub.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Embedded credentials are treated as network errors.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
deleted file mode 100644
index 385376c7321..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_4.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini b/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
index 83d36d0a1ab..8da94f60fc5 100644
--- a/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
+++ b/tests/wpt/metadata/html/browsers/origin/relaxing-the-same-origin-restriction/document_domain_access_details.sub.html.ini
@@ -1,7 +1,7 @@
 [document_domain_access_details.sub.html]
   expected: TIMEOUT
   [Access allowed if same-origin with no 'document.domain' modification. (Sanity check)]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Access is revoked to Window object when we stop being same effective script origin due to document.domain.]
     expected: NOTRUN
@@ -13,7 +13,7 @@
     expected: NOTRUN
 
   [Access not allowed if different-origin with no 'document.domain' modification. (Sanity check)]
-    expected: FAIL
+    expected: NOTRUN
 
   [Access disallowed again if same-origin, both set document-domain to existing value, then one sets to parent.]
     expected: NOTRUN
@@ -22,13 +22,13 @@
     expected: NOTRUN
 
   [Access allowed if same-origin and both set document.domain to existing value.]
-    expected: TIMEOUT
+    expected: NOTRUN
 
   [Access is not revoked to Document object when we stop being same effective script origin due to document.domain.]
     expected: NOTRUN
 
   [Access disallowed if same-origin but only one sets document.domain.]
-    expected: FAIL
+    expected: NOTRUN
 
   [Access evolves correctly for cross-origin objects when we join up via document.domain and then diverge again.]
     expected: NOTRUN
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 16fa2c5cfc1..00000000000
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index f6a7aca3306..5f60c78e73c 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,6 @@
 [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: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
new file mode 100644
index 00000000000..8cc42056d34
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
@@ -0,0 +1,10 @@
+[non-active-document.html]
+  [DOMParser]
+    expected: FAIL
+
+  [createHTMLDocument]
+    expected: FAIL
+
+  [<template>]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
index 61799e4c935..f6eecd82b49 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -1,5 +1,5 @@
 [form-double-submit-2.html]
   expected: ERROR
   [preventDefault should allow onclick submit() to succeed]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
index dce74c6dd71..47a7bbb7975 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
@@ -1,5 +1,5 @@
 [form-double-submit.html]
   expected: ERROR
   [default submit action should supersede onclick submit()]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
deleted file mode 100644
index 9e522297c94..00000000000
--- a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[toggleEvent.html]
-  [Calling open twice on 'details' fires only one toggle event]
-    expected: FAIL
-
-  [Setting open=true to opened 'details' element should not fire a toggle event at the 'details' element]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
deleted file mode 100644
index a9677391662..00000000000
--- a/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[DOMContentLoaded-defer.html]
-  [The end: DOMContentLoaded and defer scripts]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index a56bad443a2..66bd350083b 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,5 +1,4 @@
 [realtimeanalyser-fft-scaling.html]
-  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
new file mode 100644
index 00000000000..663a1f8fa30
--- /dev/null
+++ b/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
+
diff --git a/tests/wpt/mozilla/meta/css/stylesheet_media_queries.html.ini b/tests/wpt/mozilla/meta/css/stylesheet_media_queries.html.ini
deleted file mode 100644
index 6c827cec320..00000000000
--- a/tests/wpt/mozilla/meta/css/stylesheet_media_queries.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[stylesheet_media_queries.html]
-  [Media queries within stylesheets]
-    expected: FAIL
-
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index c2f03eadab6..7d9bce28879 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -239,12 +239,12 @@ jobs:
 - job: results_edge_dev
   displayName: 'all tests: Edge Dev'
   condition: |
-    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/six_hourly'),
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/three_hourly'),
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_dev'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_dev']))
   strategy:
     parallel: 10 # chosen to make runtime ~2h
-  timeoutInMinutes: 360
+  timeoutInMinutes: 180
   pool:
     name: 'Hosted Windows Client'
   steps:
@@ -275,12 +275,12 @@ jobs:
 - job: results_edge_canary
   displayName: 'all tests: Edge Canary'
   condition: |
-    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/six_hourly'),
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/three_hourly'),
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_canary'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_canary']))
   strategy:
     parallel: 10 # chosen to make runtime ~2h
-  timeoutInMinutes: 360
+  timeoutInMinutes: 180
   pool:
     name: 'Hosted Windows Client'
   steps:
@@ -316,7 +316,7 @@ jobs:
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari']))
   strategy:
     parallel: 5 # chosen to make runtime ~2h
-  timeoutInMinutes: 360
+  timeoutInMinutes: 180
   pool:
     vmImage: 'macOS-10.13'
   steps:
@@ -346,12 +346,12 @@ jobs:
 - job: results_safari_preview
   displayName: 'all tests: Safari Technology Preview'
   condition: |
-    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/six_hourly'),
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/three_hourly'),
        eq(variables['Build.SourceBranch'], 'refs/heads/triggers/safari_preview'),
        and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari_preview']))
   strategy:
     parallel: 5 # chosen to make runtime ~2h
-  timeoutInMinutes: 360
+  timeoutInMinutes: 180
   pool:
     vmImage: 'macOS-10.14'
   steps:
diff --git a/tests/wpt/web-platform-tests/.github/workflows/documentation.yml b/tests/wpt/web-platform-tests/.github/workflows/documentation.yml
index 400722f7921..9352fb81e2c 100644
--- a/tests/wpt/web-platform-tests/.github/workflows/documentation.yml
+++ b/tests/wpt/web-platform-tests/.github/workflows/documentation.yml
@@ -1,3 +1,4 @@
+name: documentation
 on:
   push:
     branches:
@@ -11,7 +12,6 @@ on:
       - 'docs/**'
       - 'resources/**'
       - 'tools/**'
-name: documentation
 jobs:
   build-and-publish:
     runs-on: ubuntu-18.04
diff --git a/tests/wpt/web-platform-tests/.github/workflows/epochs.yml b/tests/wpt/web-platform-tests/.github/workflows/epochs.yml
new file mode 100644
index 00000000000..5000d4c3dc4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/.github/workflows/epochs.yml
@@ -0,0 +1,16 @@
+name: epochs
+on:
+  schedule:
+    # Trigger 10 minutes past every 3rd hour. 10 minutes is a safety margin
+    # for any manifest workflow to finish, see tools/wpt/revlist.py.
+    - cron: 10 */3 * * *
+jobs:
+  update:
+    runs-on: ubuntu-18.04
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Run epochs_update.sh
+      run: ./tools/ci/epochs_update.sh
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/tests/wpt/web-platform-tests/.github/workflows/manifest.yml b/tests/wpt/web-platform-tests/.github/workflows/manifest.yml
index 8e81c1088ea..555b9d6c290 100644
--- a/tests/wpt/web-platform-tests/.github/workflows/manifest.yml
+++ b/tests/wpt/web-platform-tests/.github/workflows/manifest.yml
@@ -1,3 +1,4 @@
+name: manifest
 on:
   push:
     branches:
@@ -5,7 +6,6 @@ on:
   pull_request:
     paths:
       - 'tools/**'
-name: manifest
 jobs:
   build-and-tag:
     runs-on: ubuntu-18.04
diff --git a/tests/wpt/web-platform-tests/WebIDL/tools/generate-setlike.py b/tests/wpt/web-platform-tests/WebIDL/tools/generate-setlike.py
new file mode 100644
index 00000000000..407a725da6e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/tools/generate-setlike.py
@@ -0,0 +1,113 @@
+import os
+
+here = os.path.dirname(__file__)
+
+readonly_template = """\
+interface {interface}A {{
+  readonly setlike<DOMString>;
+  static void {method}();
+}};
+
+interface {interface}B {{
+  readonly setlike<DOMString>;
+  static readonly attribute long {method};
+}};
+"""
+
+readwrite_template = """\
+interface ReadOnly {{
+  readonly setlike<DOMString>;
+}};
+
+interface ReadWrite {{
+  setlike<DOMString>;
+}};
+
+interface {interface}A {{
+  setlike<DOMString>;
+  void {method}();
+}};
+
+interface {interface}B {{
+  readonly setlike<DOMString>;
+  void {method}();
+}};
+
+interface {interface}C {{
+  readonly setlike<DOMString>;
+  readonly attribute long {method};
+}};
+
+interface {interface}D {{
+  readonly setlike<DOMString>;
+  const long {method} = 0;
+}};
+
+interface {interface}E : ReadOnly {{
+  void {method}();
+}};
+
+interface {interface}F : ReadOnly {{
+  readonly attribute long {method};
+}};
+
+interface {interface}G : ReadOnly {{
+  const long {method} = 0;
+}};
+
+interface {interface}H {{
+  readonly setlike<DOMString>;
+  static void {method}();
+}};
+
+interface {interface}I {{
+  readonly setlike<DOMString>;
+  static readonly attribute long {method};
+}};
+
+interface {interface}J1 {{
+  static void {method}();
+}};
+
+interface {interface}J2 : {interface}J1 {{
+  readonly setlike<DOMString>;
+}};
+
+interface {interface}K1 {{
+  static readonly attribute long {method};
+}};
+
+interface {interface}K2 : {interface}K1 {{
+  readonly setlike<DOMString>;
+}};
+"""
+
+members_readonly = [
+    "entries",
+    "forEach",
+    "has",
+    "keys",
+    "size",
+    "values",
+]
+
+members_readwrite = [
+    "add",
+    "clear",
+    "delete",
+]
+
+def transform(m):
+    return m[0].upper() + m[1:]
+
+tests = [
+    (members_readonly, readonly_template),
+    (members_readwrite, readwrite_template),
+]
+
+for (members, template) in tests:
+    for method in members:
+        path = "{here}/../valid/idl/setlike-{method}.widl".format(here=here, method=method)
+        test = template.format(method=method, interface=transform(method))
+        with open(path, "wb") as f:
+            f.write(test.encode("utf8"))
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-add.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-add.widl
new file mode 100644
index 00000000000..a6f84908cee
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-add.widl
@@ -0,0 +1,65 @@
+interface ReadOnly {
+  readonly setlike<DOMString>;
+};
+
+interface ReadWrite {
+  setlike<DOMString>;
+};
+
+interface AddA {
+  setlike<DOMString>;
+  void add();
+};
+
+interface AddB {
+  readonly setlike<DOMString>;
+  void add();
+};
+
+interface AddC {
+  readonly setlike<DOMString>;
+  readonly attribute long add;
+};
+
+interface AddD {
+  readonly setlike<DOMString>;
+  const long add = 0;
+};
+
+interface AddE : ReadOnly {
+  void add();
+};
+
+interface AddF : ReadOnly {
+  readonly attribute long add;
+};
+
+interface AddG : ReadOnly {
+  const long add = 0;
+};
+
+interface AddH {
+  readonly setlike<DOMString>;
+  static void add();
+};
+
+interface AddI {
+  readonly setlike<DOMString>;
+  static readonly attribute long add;
+};
+
+interface AddJ1 {
+  static void add();
+};
+
+interface AddJ2 : AddJ1 {
+  readonly setlike<DOMString>;
+};
+
+interface AddK1 {
+  static readonly attribute long add;
+};
+
+interface AddK2 : AddK1 {
+  readonly setlike<DOMString>;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-clear.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-clear.widl
new file mode 100644
index 00000000000..63ebb50a246
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-clear.widl
@@ -0,0 +1,65 @@
+interface ReadOnly {
+  readonly setlike<DOMString>;
+};
+
+interface ReadWrite {
+  setlike<DOMString>;
+};
+
+interface ClearA {
+  setlike<DOMString>;
+  void clear();
+};
+
+interface ClearB {
+  readonly setlike<DOMString>;
+  void clear();
+};
+
+interface ClearC {
+  readonly setlike<DOMString>;
+  readonly attribute long clear;
+};
+
+interface ClearD {
+  readonly setlike<DOMString>;
+  const long clear = 0;
+};
+
+interface ClearE : ReadOnly {
+  void clear();
+};
+
+interface ClearF : ReadOnly {
+  readonly attribute long clear;
+};
+
+interface ClearG : ReadOnly {
+  const long clear = 0;
+};
+
+interface ClearH {
+  readonly setlike<DOMString>;
+  static void clear();
+};
+
+interface ClearI {
+  readonly setlike<DOMString>;
+  static readonly attribute long clear;
+};
+
+interface ClearJ1 {
+  static void clear();
+};
+
+interface ClearJ2 : ClearJ1 {
+  readonly setlike<DOMString>;
+};
+
+interface ClearK1 {
+  static readonly attribute long clear;
+};
+
+interface ClearK2 : ClearK1 {
+  readonly setlike<DOMString>;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-delete.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-delete.widl
new file mode 100644
index 00000000000..96d99293aa6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-delete.widl
@@ -0,0 +1,65 @@
+interface ReadOnly {
+  readonly setlike<DOMString>;
+};
+
+interface ReadWrite {
+  setlike<DOMString>;
+};
+
+interface DeleteA {
+  setlike<DOMString>;
+  void delete();
+};
+
+interface DeleteB {
+  readonly setlike<DOMString>;
+  void delete();
+};
+
+interface DeleteC {
+  readonly setlike<DOMString>;
+  readonly attribute long delete;
+};
+
+interface DeleteD {
+  readonly setlike<DOMString>;
+  const long delete = 0;
+};
+
+interface DeleteE : ReadOnly {
+  void delete();
+};
+
+interface DeleteF : ReadOnly {
+  readonly attribute long delete;
+};
+
+interface DeleteG : ReadOnly {
+  const long delete = 0;
+};
+
+interface DeleteH {
+  readonly setlike<DOMString>;
+  static void delete();
+};
+
+interface DeleteI {
+  readonly setlike<DOMString>;
+  static readonly attribute long delete;
+};
+
+interface DeleteJ1 {
+  static void delete();
+};
+
+interface DeleteJ2 : DeleteJ1 {
+  readonly setlike<DOMString>;
+};
+
+interface DeleteK1 {
+  static readonly attribute long delete;
+};
+
+interface DeleteK2 : DeleteK1 {
+  readonly setlike<DOMString>;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-entries.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-entries.widl
new file mode 100644
index 00000000000..a8b7eed09d4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-entries.widl
@@ -0,0 +1,9 @@
+interface EntriesA {
+  readonly setlike<DOMString>;
+  static void entries();
+};
+
+interface EntriesB {
+  readonly setlike<DOMString>;
+  static readonly attribute long entries;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-forEach.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-forEach.widl
new file mode 100644
index 00000000000..f433fbe5137
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-forEach.widl
@@ -0,0 +1,9 @@
+interface ForEachA {
+  readonly setlike<DOMString>;
+  static void forEach();
+};
+
+interface ForEachB {
+  readonly setlike<DOMString>;
+  static readonly attribute long forEach;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-has.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-has.widl
new file mode 100644
index 00000000000..e50ac56cd19
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-has.widl
@@ -0,0 +1,9 @@
+interface HasA {
+  readonly setlike<DOMString>;
+  static void has();
+};
+
+interface HasB {
+  readonly setlike<DOMString>;
+  static readonly attribute long has;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-keys.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-keys.widl
new file mode 100644
index 00000000000..9a9899eb528
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-keys.widl
@@ -0,0 +1,9 @@
+interface KeysA {
+  readonly setlike<DOMString>;
+  static void keys();
+};
+
+interface KeysB {
+  readonly setlike<DOMString>;
+  static readonly attribute long keys;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-size.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-size.widl
new file mode 100644
index 00000000000..8a528ccf4b1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-size.widl
@@ -0,0 +1,9 @@
+interface SizeA {
+  readonly setlike<DOMString>;
+  static void size();
+};
+
+interface SizeB {
+  readonly setlike<DOMString>;
+  static readonly attribute long size;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-values.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-values.widl
new file mode 100644
index 00000000000..34c4c342eb3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike-values.widl
@@ -0,0 +1,9 @@
+interface ValuesA {
+  readonly setlike<DOMString>;
+  static void values();
+};
+
+interface ValuesB {
+  readonly setlike<DOMString>;
+  static readonly attribute long values;
+};
diff --git a/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike.widl b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike.widl
new file mode 100644
index 00000000000..cd5e06347db
--- /dev/null
+++ b/tests/wpt/web-platform-tests/WebIDL/valid/idl/setlike.widl
@@ -0,0 +1,15 @@
+interface ReadOnly {
+  readonly setlike<DOMString>;
+};
+
+interface ReadWrite {
+  setlike<DOMString>;
+};
+
+interface ReadOnlyExtAttr {
+  readonly setlike<[Clamp] unsigned short>;
+};
+
+interface ReadWriteExtAttr {
+  setlike<[Clamp] unsigned short>;
+};
diff --git a/tests/wpt/web-platform-tests/accname/name_test_case_610-manual.html b/tests/wpt/web-platform-tests/accname/name_test_case_610-manual.html
index fc8bcf2efa3..33eaaba4c7e 100644
--- a/tests/wpt/web-platform-tests/accname/name_test_case_610-manual.html
+++ b/tests/wpt/web-platform-tests/accname/name_test_case_610-manual.html
@@ -62,7 +62,7 @@
   <body>
   <p>This test examines the ARIA properties for Name test case 610.</p>
     <input id="test" type="text" aria-label="bar" aria-labelledby="ID1 test">
-  <div id="ID1">foo</label>
+  <div id="ID1">foo</div>
 
   <div id="manualMode"></div>
   <div id="log"></div>
diff --git a/tests/wpt/web-platform-tests/compat/webkit-box-fieldset-ref.html b/tests/wpt/web-platform-tests/compat/webkit-box-fieldset-ref.html
new file mode 100644
index 00000000000..b5d7176150d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compat/webkit-box-fieldset-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<p>Fieldset should contain a green div spanning the width.
+<fieldset>
+  <div id="child" style="background:green; height:10px"></div>
+</fieldset>
diff --git a/tests/wpt/web-platform-tests/compat/webkit-box-fieldset.html b/tests/wpt/web-platform-tests/compat/webkit-box-fieldset.html
new file mode 100644
index 00000000000..c3a2e64c114
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compat/webkit-box-fieldset.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<link rel="match" href="webkit-box-fieldset-ref.html">
+<p>Fieldset should contain a green div spanning the width.
+<fieldset style="display: -webkit-box">
+  <div id="child" style="background:green; height:10px"></div>
+</fieldset>
diff --git a/tests/wpt/web-platform-tests/compression/compression-bad-chunks.any.js b/tests/wpt/web-platform-tests/compression/compression-bad-chunks.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/compression-bad-chunks.any.js
rename to tests/wpt/web-platform-tests/compression/compression-bad-chunks.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/compression-including-empty-chunk.any.js b/tests/wpt/web-platform-tests/compression/compression-including-empty-chunk.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/compression-including-empty-chunk.any.js
rename to tests/wpt/web-platform-tests/compression/compression-including-empty-chunk.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/compression-multiple-chunks.any.js b/tests/wpt/web-platform-tests/compression/compression-multiple-chunks.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/compression-multiple-chunks.any.js
rename to tests/wpt/web-platform-tests/compression/compression-multiple-chunks.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/compression-output-length.any.js b/tests/wpt/web-platform-tests/compression/compression-output-length.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/compression-output-length.any.js
rename to tests/wpt/web-platform-tests/compression/compression-output-length.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/compression-stream.any.js b/tests/wpt/web-platform-tests/compression/compression-stream.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/compression-stream.any.js
rename to tests/wpt/web-platform-tests/compression/compression-stream.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-bad-chunks.any.js b/tests/wpt/web-platform-tests/compression/decompression-bad-chunks.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-bad-chunks.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-bad-chunks.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-buffersource.any.js b/tests/wpt/web-platform-tests/compression/decompression-buffersource.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-buffersource.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-buffersource.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-constructor-error.any.js b/tests/wpt/web-platform-tests/compression/decompression-constructor-error.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-constructor-error.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-constructor-error.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-correct-input.any.js b/tests/wpt/web-platform-tests/compression/decompression-correct-input.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-correct-input.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-correct-input.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-empty-input.any.js b/tests/wpt/web-platform-tests/compression/decompression-empty-input.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-empty-input.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-empty-input.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-split-chunk.any.js b/tests/wpt/web-platform-tests/compression/decompression-split-chunk.tentative.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/compression/decompression-split-chunk.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-split-chunk.tentative.any.js
diff --git a/tests/wpt/web-platform-tests/compression/decompression-uint8array-output.any.js b/tests/wpt/web-platform-tests/compression/decompression-uint8array-output.tentative.any.js
similarity index 88%
rename from tests/wpt/web-platform-tests/compression/decompression-uint8array-output.any.js
rename to tests/wpt/web-platform-tests/compression/decompression-uint8array-output.tentative.any.js
index 06c421a8207..a441aed8234 100644
--- a/tests/wpt/web-platform-tests/compression/decompression-uint8array-output.any.js
+++ b/tests/wpt/web-platform-tests/compression/decompression-uint8array-output.tentative.any.js
@@ -1,4 +1,8 @@
 // META: global=worker
+// META: timeout=long
+//
+// This test isn't actually slow usually, but sometimes it takes >10 seconds on
+// Firefox with service worker for no obvious reason.
 
 'use strict';
 
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-align-justify-stretch.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-align-justify-stretch.html
new file mode 100644
index 00000000000..09c34f1c125
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-align-justify-stretch.html
@@ -0,0 +1,193 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout test: stretch value for align and justify properties</title>
+<link rel="author" title="Rossana Monteriso" href="mailto:rmonteriso@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#alignment">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#typedef-self-position">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#distribution-values">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#content-distribution">
+
+<meta name="assert" content="This test checks that the 'stretch' value is applied correctly for 'align' and 'justify' properties for both RTL/LTR directions and horizontal/vertical writing modes.">
+<meta name="flags" content="ahem">
+<link rel="stylesheet" href="/css/support/grid.css">
+<link rel="stylesheet" href="/css/support/alignment.css">
+<link rel="stylesheet" href="support/width-keyword-classes.css">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+body {
+    margin: 0;
+}
+
+.grid {
+    grid-template-columns: 100px 100px;
+    grid-template-rows: 200px 200px;
+    margin-bottom: 20px;
+}
+
+.widthAndHeightSet {
+    width: 20px;
+    height: 40px;
+}
+.onlyWidthSet { width: 20px; }
+.onlyHeightSet { height: 40px; }
+.maxHeight { max-height: 160px; }
+.maxWidth { max-width: 90px; }
+.minWidth { min-width: 120px; }
+.minHeight { min-height: 220px; }
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body onload="checkLayout('.grid')">
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="alignSelfStretch justifySelfStart firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="0" data-expected-height="200"></div>
+        <div class="widthAndHeightSet alignSelfStretch justifySelfStart firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet alignSelfStretch justifySelfStart secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet alignSelfStretch justifySelfStart secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="0" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="alignSelfStart justifySelfStretch firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="0"></div>
+        <div class="widthAndHeightSet alignSelfStart justifySelfStretch firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet alignSelfStart justifySelfStretch secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="0"></div>
+        <div class="onlyHeightSet alignSelfStart justifySelfStretch secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="maxHeight alignSelfStretch justifySelfStart firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="0" data-expected-height="160"></div>
+        <div class="minWidth widthAndHeightSet alignSelfStretch justifySelfStart firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="120" data-expected-height="40"></div>
+        <div class="minHeight onlyWidthSet alignSelfStretch justifySelfStart secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="220"></div>
+        <div class="maxWidth onlyHeightSet alignSelfStretch justifySelfStretch secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="90" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="alignSelfStretch justifySelfStretch firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet alignSelfStretch justifySelfStretch firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet alignSelfStretch justifySelfStretch secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet alignSelfStretch justifySelfStretch secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content alignItemsStretch justifyItemsStart" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="0" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="0" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content alignItemsStart justifyItemsStretch" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="0"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="0"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content alignItemsStretch justifyItemsStretch" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content alignItemsAuto justifyItemsAuto" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="firstRowSecondColumn" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="secondRowFirstColumn" data-offset-x="0" data-offset-y="200" data-expected-width="100" data-expected-height="200"></div>
+        <div class="secondRowSecondColumn" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="200"></div>
+    </div>
+</div>
+
+<!-- RTL direction (it should not affect the block-flow direction). -->
+<div style="position: relative">
+    <div class="grid fit-content directionRTL alignItemsStretch justifyItemsStretch" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn" data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="80" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="180" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="0" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<!-- RTL direction (it should not affect the block-flow) with opposite directions grid container vs grid item. -->
+<div style="position: relative">
+    <div class="grid fit-content alignItemsStretch justifyItemsStretch" data-expected-width="200" data-expected-height="400">
+        <div class="firstRowFirstColumn  directionRTL" data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="200"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn  directionRTL" data-offset-x="100" data-offset-y="0" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn  directionRTL" data-offset-x="0" data-offset-y="200" data-expected-width="20" data-expected-height="200"></div>
+        <div class="onlyHeightSet secondRowSecondColumn  directionRTL" data-offset-x="100" data-offset-y="200" data-expected-width="100" data-expected-height="40"></div>
+    </div>
+</div>
+
+<!-- Vertical RL writing mode. -->
+<div style="position: relative">
+    <div class="grid fit-content verticalRL alignItemsStretch justifyItemsStretch" data-expected-width="400" data-expected-height="200">
+        <div class="firstRowFirstColumn" data-offset-x="200" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="380" data-offset-y="100" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="180" data-offset-y="0" data-expected-width="20" data-expected-height="100"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="0" data-offset-y="100" data-expected-width="200" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content verticalRL" data-expected-width="400" data-expected-height="200">
+        <div class="firstRowFirstColumn" data-offset-x="200" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="firstRowSecondColumn" data-offset-x="200" data-offset-y="100" data-expected-width="200" data-expected-height="100"></div>
+        <div class="secondRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="secondRowSecondColumn" data-offset-x="0" data-offset-y="100" data-expected-width="200" data-expected-height="100"></div>
+    </div>
+</div>
+
+<!-- Vertical LR writing mode. -->
+<div style="position: relative">
+    <div class="grid fit-content verticalLR alignItemsStretch justifyItemsStretch" data-expected-width="400" data-expected-height="200">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="widthAndHeightSet firstRowSecondColumn" data-offset-x="0" data-offset-y="100" data-expected-width="20" data-expected-height="40"></div>
+        <div class="onlyWidthSet secondRowFirstColumn" data-offset-x="200" data-offset-y="0" data-expected-width="20" data-expected-height="100"></div>
+        <div class="onlyHeightSet secondRowSecondColumn" data-offset-x="200" data-offset-y="100" data-expected-width="200" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="position: relative">
+    <div class="grid fit-content verticalLR" data-expected-width="400" data-expected-height="200">
+        <div class="firstRowFirstColumn" data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="firstRowSecondColumn" data-offset-x="0" data-offset-y="100" data-expected-width="200" data-expected-height="100"></div>
+        <div class="secondRowFirstColumn" data-offset-x="200" data-offset-y="0" data-expected-width="200" data-expected-height="100"></div>
+        <div class="secondRowSecondColumn" data-offset-x="200" data-offset-y="100" data-expected-width="200" data-expected-height="100"></div>
+    </div>
+</div>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/support/width-keyword-classes.css b/tests/wpt/web-platform-tests/css/css-grid/alignment/support/width-keyword-classes.css
new file mode 100644
index 00000000000..b5c84a5d5f4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/support/width-keyword-classes.css
@@ -0,0 +1,90 @@
+/*
+    Take every possible line break so the box width is the width of largest
+    unbreakable line box.
+*/
+.min-content {
+    /* Webkit, but not actually implemented outside deprecated flexbox */
+    width: min-intrinsic;
+    width: -webkit-min-content;
+    width: -moz-min-content;
+    width: min-content;
+}
+
+.max-content {
+    width: -webkit-max-content;
+    width: -moz-max-content;
+    width: max-content;
+}
+
+/*
+    Identical to auto except for elements with an instrinsic width like an
+    img where this overrides the intrinsic width to get regular block "auto".
+*/
+.fill-available {
+    width: -webkit-fill-available;
+    /* Firefox is missing the fill- prefix because they followed an older spec */
+    width: -moz-available;
+    width: fill-available;
+}
+
+/*
+   Shrink wrap just like floating.
+   max(min-content, min(max-content, fill-available))
+*/
+.fit-content {
+    /* Webkit, but only outside a deprecated flexbox. */
+    width: intrinsic;
+    width: -webkit-fit-content;
+    width: -moz-fit-content;
+    width: fit-content;
+}
+
+.max-width-min-content {
+    max-width: -webkit-min-content;
+    max-width: -moz-min-content;
+    max-width: min-content;
+}
+
+.max-width-max-content {
+    max-width: -webkit-max-content;
+    max-width: -moz-max-content;
+    max-width: max-content;
+}
+
+.max-width-fill-available {
+    max-width: -webkit-fill-available;
+    max-width: -moz-available;
+    max-width: fill-available;
+}
+
+.max-width-fit-content {
+    max-width: intrinsic;
+    max-width: -webkit-fit-content;
+    max-width: -moz-fit-content;
+    max-width: fit-content;
+}
+
+.min-width-min-content {
+    min-width: -webkit-min-content;
+    min-width: -moz-min-content;
+    min-width: min-content;
+}
+
+.min-width-max-content {
+    min-width: -webkit-max-content;
+    min-width: -moz-max-content;
+    min-width: max-content;
+}
+
+.min-width-fill-available {
+    min-width: -webkit-fill-available;
+    min-width: -moz-available;
+    min-width: fill-available;
+}
+
+.min-width-fit-content {
+    min-width: intrinsic;
+    min-width: -webkit-fit-content;
+    min-width: -moz-fit-content;
+    min-width: fit-content;
+}
diff --git a/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007-ref.html b/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007-ref.html
new file mode 100644
index 00000000000..8c523a968c1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>CSS Reference: String value of list-style-type with Ahem font</title>
+  <link rel="author" title="Oriol Brufau" href="mailto:obrufau@gmail.com">
+  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+  <style>
+    main {
+      width: 300px;
+      overflow: auto;
+      padding: 10px 0;
+    }
+    pre {
+      font: 10px/1 Ahem;
+      margin: 0;
+      width: 100%;
+      padding-right: 70px;
+    }
+  </style>
+</head>
+<body>
+  <main>
+    <pre>          É1      1É          </pre>
+    <pre>       XXXÉ2      2ÉXXX       </pre>
+    <pre>    XXXpppÉ3      3ÉXXXppp    </pre>
+    <pre>  XXX ppp É4      4É XXX ppp  </pre>
+    <pre> XXX   pppÉ5      5ÉXXX   ppp </pre>
+    <pre>XX Xp pp  É6      6É  XX Xp pp</pre>
+    <pre>X X Xp p pÉ7      7ÉX X Xp p p</pre>
+    <pre>XX XXXpXXXÉ8      8ÉXXXXpXX XX</pre>
+    <pre>X XXXpXXX É9      9É XXXXpXX X</pre>
+  </main>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007.html b/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007.html
new file mode 100644
index 00000000000..55c883ff4c3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-lists/list-style-type-string-007.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>String value of list-style-type with Ahem font</title>
+  <link rel="author" title="Oriol Brufau" href="mailto:obrufau@gmail.com">
+  <link rel="help" href="https://drafts.csswg.org/css-lists-3/#valdef-list-style-type-string">
+  <link rel="match" href="list-style-type-string-007-ref.html">
+  <meta name="assert" content="This test checks that list-style-type can set the marker string with the Ahem font.">
+  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+  <style>
+    main {
+      width: 300px;
+      overflow: auto;
+      padding: 10px 0;
+    }
+    .list {
+      font: 10px/1 Ahem;
+      padding-inline-start: 100px;
+      margin: 0;
+      width: 50px;
+      float: left;
+    }
+    .rtl { direction: rtl; }
+    .list > :nth-child(1) { list-style-type: ""; }
+    .list > :nth-child(2) { list-style-type: "XXX"; }
+    .list > :nth-child(3) { list-style-type: "XXXppp"; }
+    .list > :nth-child(4) { list-style-type: " XXX ppp "; }
+    .list > :nth-child(5) { list-style-type: "XXX   ppp"; }
+    .list > :nth-child(6) { list-style-type: "  XX Xp pp  "; }
+    .list > :nth-child(7) { list-style-type: "X X Xp p p"; }
+    .list > :nth-child(8) { list-style-type: "XXXXpXX XXXpXXX"; }
+    .list > :nth-child(9) { list-style-type: " XXXXpXX XXXpXXX "; }
+  </style>
+</head>
+<body>
+  <main>
+    <ol class="list">
+      <li>É1</li>
+      <li>É2</li>
+      <li>É3</li>
+      <li>É4</li>
+      <li>É5</li>
+      <li>É6</li>
+      <li>É7</li>
+      <li>É8</li>
+      <li>É9</li>
+    </ol>
+    <ul class="list rtl">
+      <li>1É</li>
+      <li>2É</li>
+      <li>3É</li>
+      <li>4É</li>
+      <li>5É</li>
+      <li>6É</li>
+      <li>7É</li>
+      <li>8É</li>
+      <li>9É</li>
+    </ul>
+  </main>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-absolute-replaced-minmax.html b/tests/wpt/web-platform-tests/css/css-position/position-absolute-replaced-minmax.html
index 00780d650fa..5a76277092b 100644
--- a/tests/wpt/web-platform-tests/css/css-position/position-absolute-replaced-minmax.html
+++ b/tests/wpt/web-platform-tests/css/css-position/position-absolute-replaced-minmax.html
@@ -284,6 +284,18 @@
   data-expected-width="238" data-expected-height="52" data-offset-y="141" data-offset-x="159"
   >
 </div>
+<!-- Viewbox + css height. Has aspect_ratio and height. Width is scaled -->
+<div class="container">
+  <img class="target" style="height:20px" src="data:image/svg+xml,%3Csvg viewBox='0 0 100 10' xmlns='http://www.w3.org/2000/svg' %3E%3Crect width='100%' height='100%' style='fill:rgb(0,255,0);'/%3E%3C/svg%3E"
+  data-expected-width="238" data-expected-height="52" data-offset-y="141" data-offset-x="159"
+  >
+</div>
+<!-- Viewbox + css width. Has aspect_ratio and width. Height is scaled -->
+<div class="container">
+  <img class="target" style="width:238px" src="data:image/svg+xml,%3Csvg viewBox='0 0 100 10' xmlns='http://www.w3.org/2000/svg' %3E%3Crect width='100%' height='100%' style='fill:rgb(0,255,0);'/%3E%3C/svg%3E"
+  data-expected-width="276" data-expected-height="56" data-offset-y="137" data-offset-x="121"
+  >
+</div>
 <script>
   // initialize png images with  200x150 green png
   let pngSrc="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAACWAQMAAAChElVaAAAABGdBTUEAALGPC/xhBQAAACBjSFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAABlBMVEUAgAD///8UPy9PAAAAAWJLR0QB/wIt3gAAAAd0SU1FB+MBDwkdA1Cz/EMAAAAbSURBVEjH7cGBAAAAAMOg+VPf4ARVAQAAAM8ADzwAAeM8wQsAAAAldEVYdGRhdGU6Y3JlYXRlADIwMTktMDEtMTVUMTc6Mjk6MDMtMDg6MDCYDy9IAAAAJXRFWHRkYXRlOm1vZGlmeQAyMDE5LTAxLTE1VDE3OjI5OjAzLTA4OjAw6VKX9AAAAABJRU5ErkJggg=="
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html
new file mode 100644
index 00000000000..6631039d248
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom-view/MediaQueryListEvent.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name="flags" content="dom">
+<title>CSS Test: CSSOM View MediaQueryListEvent</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/cssom-view/#mediaquerylistevent">
+<div id="log"></div>
+<script>
+"use strict";
+
+test(t => {
+    assert_equals(MediaQueryListEvent.length, 1);
+    assert_throws(new TypeError(), () => {
+        new MediaQueryListEvent();
+    });
+}, "type argument is required");
+
+test(t => {
+    assert_equals(new MediaQueryListEvent("test").type, "test");
+}, 'type can be different from "change"');
+
+test(t => {
+    assert_equals(Object.getPrototypeOf(MediaQueryListEvent), Event);
+    assert_true(new MediaQueryListEvent("change") instanceof Event);
+}, "extends Event");
+
+test(t => {
+    const event = new MediaQueryListEvent("change");
+
+    assert_equals(event.media, "");
+    assert_false(event.matches);
+    assert_false(event.bubbles);
+    assert_false(event.cancelable);
+}, "init dictionary default values");
+
+test(t => {
+    const event = new MediaQueryListEvent("change", {
+        media: "test",
+        matches: true,
+        bubbles: true,
+        cancelable: true,
+    });
+
+    assert_equals(event.media, "test");
+    assert_true(event.matches);
+    assert_true(event.bubbles);
+    assert_true(event.cancelable);
+}, "init dictionary overrides");
+
+test(t => {
+    const event = new MediaQueryListEvent("change");
+    assert_idl_attribute(event, "media");
+    assert_readonly(event, "media");
+}, "MediaQueryListEvent::media is read-only IDL attribute");
+
+test(t => {
+    const event = new MediaQueryListEvent("change");
+    assert_idl_attribute(event, "matches");
+    assert_readonly(event, "matches");
+}, "MediaQueryListEvent::matches is read-only IDL attribute");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/focus-visible-008.html b/tests/wpt/web-platform-tests/css/selectors/focus-visible-008-manual.html
similarity index 93%
rename from tests/wpt/web-platform-tests/css/selectors/focus-visible-008.html
rename to tests/wpt/web-platform-tests/css/selectors/focus-visible-008-manual.html
index b7f61d2fa80..53306a90bbc 100644
--- a/tests/wpt/web-platform-tests/css/selectors/focus-visible-008.html
+++ b/tests/wpt/web-platform-tests/css/selectors/focus-visible-008-manual.html
@@ -29,16 +29,21 @@
   <button id="button">Tab to me and press ENTER.</button>
   <div id="el" tabindex="-1">I will be focused programmatically.</el>
   <script>
-    button.addEventListener("click", () => {
-        el.focus();
-    });
+  if ("async_test" in window) {
     async_test(function(t) {
+      button.addEventListener("click", t.step_func(() => {
+        el.focus();
+      }));
       el.addEventListener("focus", t.step_func(function() {
         assert_equals(getComputedStyle(el).outlineColor, "rgb(0, 100, 0)");
         t.done();
       }));
-      el.focus();
     }, "Programmatic focus after keypress should match :focus-visible");
+  } else {
+    button.addEventListener("click", () => {
+      el.focus();
+    });
+  }
   </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/selectors/focus-visible-012-manual.html b/tests/wpt/web-platform-tests/css/selectors/focus-visible-012-manual.html
new file mode 100644
index 00000000000..c659a728986
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/focus-visible-012-manual.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>CSS Test (Selectors): Keyboard shortcut combinations do not trigger :focus-visible</title>
+  <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
+  <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <style>
+    :focus-visible {
+      outline: 0;
+      outline-color: tomato;
+      background-color: tomato;
+    }
+
+    :focus:not(:focus-visible) {
+      outline: darkgreen dotted 1px; /* fallback for Edge */
+      outline: darkgreen auto 5px;
+    }
+  </style>
+</head>
+<body>
+  This test checks that using keyboard combinations with [Ctrl], [Alt] or [Cmd]
+  do not trigger <code>:focus-visible</code> matching.
+  <ol id="instructions">
+    <li>If the user-agent does not claim to support the <code>:focus-visible</code> pseudo-class then SKIP this test.</li>
+    <li>Click the element below that says "Click me, then use a keyboard shortcut."</li>
+    <li>Press a keyboard combination including [Ctrl], [Alt] or [Cmd], such as <code>Ctrl</code> + <code>y</code></li>
+    <li>If the element has a red background, then the test result is FAILURE. If the element has a green outline, then the test result is SUCCESS.</li>
+  </ol>
+  <br>
+  <div id="el" tabindex="0">Click me, then use a keyboard shortcut.</div>
+  <script>
+        var t = async_test( "Keyboard focus should match :focus-visible");
+
+        el.addEventListener("click", t.step_func(function(e) {
+          assert_equals(getComputedStyle(el).outlineColor, "rgb(0, 100, 0)", "after focus()");
+        }), true);
+
+        el.addEventListener("keydown", t.step_func(function(e) {
+          if (e.altKey || e.ctrlKey || e.metaKey) {
+            assert_equals(getComputedStyle(el).outlineColor, "rgb(0, 100, 0)", "after kb event");
+            t.done();
+            return;
+          }
+          assert_true(false, "No modifier key");
+          t.done();
+        }));
+
+        window.setTimeout(t.step_func_done(()=> {
+          assert_true(false, "timeout");
+        }), 1000);
+
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/custom-elements/form-associated/ElementInternals-accessibility.html b/tests/wpt/web-platform-tests/custom-elements/form-associated/ElementInternals-accessibility.html
index f5d96643ba2..c98d771b502 100644
--- a/tests/wpt/web-platform-tests/custom-elements/form-associated/ElementInternals-accessibility.html
+++ b/tests/wpt/web-platform-tests/custom-elements/form-associated/ElementInternals-accessibility.html
@@ -25,7 +25,7 @@ customElements.define("test-element", TestElement);
 const element = document.getElementById("testElement");
 const properties = [
   "role",
-  "ariaActiveDescendant",
+  "ariaActiveDescendantElement",
   "ariaAtomic",
   "ariaAutoComplete",
   "ariaBusy",
@@ -33,26 +33,26 @@ const properties = [
   "ariaColCount",
   "ariaColIndex",
   "ariaColSpan",
-  "ariaControls",
+  "ariaControlsElements",
   "ariaCurrent",
-  "ariaDescribedBy",
-  "ariaDetails",
+  "ariaDescribedByElements",
+  "ariaDetailsElement",
   "ariaDisabled",
-  "ariaErrorMessage",
+  "ariaErrorMessageElement",
   "ariaExpanded",
-  "ariaFlowTo",
+  "ariaFlowToElements",
   "ariaHasPopup",
   "ariaHidden",
   "ariaKeyShortcuts",
   "ariaLabel",
-  "ariaLabelledBy",
+  "ariaLabelledByElements",
   "ariaLevel",
   "ariaLive",
   "ariaModal",
   "ariaMultiLine",
   "ariaMultiSelectable",
   "ariaOrientation",
-  "ariaOwns",
+  "ariaOwnsElements",
   "ariaPlaceholder",
   "ariaPosInSet",
   "ariaPressed",
diff --git a/tests/wpt/web-platform-tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html b/tests/wpt/web-platform-tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html
index f83eff82b5e..592a33ef3ba 100644
--- a/tests/wpt/web-platform-tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html
@@ -17,6 +17,8 @@
 setup({allow_uncaught_exception : true});
 
 function test(mime_type, is_blocking_expected) {
+  var action = is_blocking_expected ? "blocks" : "does not block";
+
   async_test(function(t) {
     var script = document.createElement("script")
     var script_has_run_token = "script_has_run" + token();
@@ -49,7 +51,7 @@ function test(mime_type, is_blocking_expected) {
     body = `window['${script_has_run_token}'] = true;`
     script.src = src_prefix + "?type=" + mime_type + "&body=" + encodeURIComponent(body);
     document.body.appendChild(script)
-  }, "CORB-blocks '" + mime_type + "' that starts with the following JSON parser breaker: " + body);
+  }, "CORB " + action + " '" + mime_type + "'");
 }
 
 // Some mime types should be protected by CORB without any kind
diff --git a/tests/wpt/web-platform-tests/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html b/tests/wpt/web-platform-tests/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html
index eee21dafcac..760ed3a2998 100644
--- a/tests/wpt/web-platform-tests/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/metadata/redirect/redirect-https-downgrade.tentative.sub.html
@@ -37,7 +37,7 @@
     }, "Https downgrade font => No headers");
   });
 
-  promise_test(() =>
+  promise_test(() => {
     return requestViaImage(secureRedirectURL + encodeURIComponent("http://{{host}}:{{ports[http][0]}}/common/security-features/subresource/image.py"))
       .then(result => {
          headers = result.headers;
@@ -53,7 +53,8 @@
            "user": undefined,
            "mode": undefined,
          });
-  }), "Https downgrade image => No headers");
+      });
+  }, "Https downgrade image => No headers");
 </script>
 
 <script src="https://{{host}}:{{ports[https][0]}}/fetch/api/resources/redirect.py?location=http%3A%2F%2F{{host}}%3A{{ports[http][0]}}%2Ffetch%2Fmetadata%2Fresources%2Fecho-as-script.py"></script>
diff --git a/tests/wpt/web-platform-tests/images/wpt-pr-bot-logo/wpt-pr-bot-logo-darkblue.svg b/tests/wpt/web-platform-tests/images/wpt-pr-bot-logo/wpt-pr-bot-logo-darkblue.svg
new file mode 100644
index 00000000000..d6712fa23c9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/images/wpt-pr-bot-logo/wpt-pr-bot-logo-darkblue.svg
@@ -0,0 +1,50 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+ width="260" height="260" viewBox="0 0 1280.000000 1276.000000"
+ preserveAspectRatio="xMidYMid meet">
+<!-- from https://svgsilh.com/image/303465.html , CC0 -->
+<metadata>
+Created by potrace 1.15, written by Peter Selinger 2001-2017
+</metadata>
+<g transform="translate(0.000000,1276.000000) scale(0.100000,-0.100000)"
+fill="#003C56" stroke="none">
+<path d="M5975 12749 c-86 -6 -144 -14 -151 -22 -6 -6 -41 -111 -77 -232 -37
+-121 -107 -355 -157 -520 -50 -165 -123 -406 -162 -536 l-71 -237 -188 -46
+c-213 -52 -475 -135 -658 -208 -68 -27 -130 -47 -137 -44 -7 3 -301 221 -653
+485 -353 265 -645 481 -649 481 -13 0 -257 -149 -392 -240 -198 -132 -359
+-254 -578 -436 l-25 -21 271 -746 c150 -411 272 -752 272 -758 0 -6 -40 -56
+-88 -112 -175 -202 -337 -420 -457 -615 -32 -52 -64 -96 -72 -99 -8 -3 -366 4
+-796 16 -430 12 -794 21 -808 21 -23 0 -30 -9 -56 -67 -61 -137 -142 -353
+-202 -538 -61 -186 -145 -494 -138 -502 2 -2 303 -204 668 -448 562 -377 665
+-450 670 -473 3 -15 1 -72 -4 -127 -8 -99 -2 -525 11 -702 l7 -92 -669 -448
+c-367 -246 -672 -450 -677 -453 -9 -6 23 -147 72 -320 71 -249 180 -554 284
+-794 l16 -39 137 6 c75 4 440 14 810 24 l673 17 25 -29 c13 -17 68 -95 120
+-174 113 -169 222 -314 350 -467 l93 -111 -275 -752 c-151 -414 -274 -757
+-272 -761 5 -14 213 -185 361 -296 225 -170 606 -418 631 -412 7 2 299 219
+649 482 l637 479 47 -15 c27 -9 84 -30 128 -48 183 -74 392 -141 619 -200 81
+-21 149 -40 151 -42 3 -3 222 -724 386 -1273 38 -126 73 -239 78 -251 8 -18
+24 -22 137 -33 314 -30 1078 -22 1110 12 6 7 41 111 77 232 37 121 107 355
+157 520 50 165 123 406 162 536 l71 237 188 46 c213 52 475 135 658 208 68 27
+130 47 137 44 7 -3 301 -221 653 -485 353 -265 644 -481 649 -481 11 0 250
+145 362 220 206 137 422 299 608 456 l25 21 -271 746 c-150 411 -272 752 -272
+758 0 6 40 56 88 112 175 202 337 420 457 615 32 52 64 96 72 99 8 3 366 -4
+796 -16 430 -12 794 -21 808 -21 23 0 30 9 56 68 61 136 142 352 202 537 61
+186 145 494 138 502 -2 2 -303 204 -668 448 -562 377 -665 450 -670 473 -3 15
+-1 72 4 127 8 99 2 527 -11 702 l-7 92 668 448 c368 246 673 450 678 453 9 6
+-22 146 -72 320 -71 249 -180 554 -284 794 l-17 39 -141 -6 c-78 -4 -443 -14
+-810 -24 l-668 -17 -25 29 c-13 17 -68 95 -120 174 -113 169 -222 314 -350
+467 l-93 111 275 752 c151 414 274 757 272 761 -5 14 -213 185 -361 296 -225
+170 -606 418 -631 412 -7 -2 -299 -219 -649 -482 l-637 -479 -47 15 c-27 9
+-84 30 -128 48 -183 74 -392 141 -619 200 -81 21 -149 40 -151 42 -3 3 -222
+724 -386 1273 -38 127 -73 239 -78 251 -8 18 -24 22 -137 33 -164 16 -775 22
+-959 10z"/>
+</g>
+
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 762 762">
+<rect x="183.9" y="511.4" fill="#FFFFFF" width="201.5" height="38"/>
+<path fill="#FFFFFF" d="M504.9,549.4c37.3,0,67.6-30.3,67.6-67.6v-19h-38v19c0,16.3-13.3,29.6-29.6,29.6c-16.3,0-29.6-13.3-29.6-29.6
+V287.4h-38v56.5h-51.9v-92.6h112.4c25.5,0,46.3,20.8,46.3,46.3c0,20-13,37.8-31.8,44v39.1c40-6.9,69.8-42.1,69.8-83
+c0-46.5-37.8-84.3-84.3-84.3H366.4c-10.5,0-19,8.5-19,19V386l-46.4-79.4c-3.4-5.8-9.7-9.4-16.4-9.4c-6.7,0-13,3.6-16.4,9.4
+l-46.2,79.2V213.4h-38v242.7c0,8.6,5.8,16.1,14,18.3c8.3,2.2,17.1-1.4,21.4-8.8l65.2-111.8L350,465.7c3.4,5.8,9.7,9.4,16.4,9.4
+c1.7,0,3.3-0.2,5-0.7c8.3-2.2,14-9.8,14-18.3v-74.2h51.9v99.8C437.3,519.1,467.6,549.4,504.9,549.4z"/>
+</svg>
+</svg>
diff --git a/tests/wpt/web-platform-tests/interfaces/credential-management.idl b/tests/wpt/web-platform-tests/interfaces/credential-management.idl
index da1b9dfca69..d097dd084b6 100644
--- a/tests/wpt/web-platform-tests/interfaces/credential-management.idl
+++ b/tests/wpt/web-platform-tests/interfaces/credential-management.idl
@@ -21,9 +21,9 @@ partial interface Navigator {
 
 [Exposed=Window, SecureContext]
 interface CredentialsContainer {
-  Promise<Credential?> get(optional CredentialRequestOptions options);
+  Promise<Credential?> get(optional CredentialRequestOptions options = {});
   Promise<Credential> store(Credential credential);
-  Promise<Credential?> create(optional CredentialCreationOptions options);
+  Promise<Credential?> create(optional CredentialCreationOptions options = {});
   Promise<void> preventSilentAccess();
 };
 
@@ -46,11 +46,11 @@ dictionary CredentialCreationOptions {
   AbortSignal signal;
 };
 
-[Constructor(HTMLFormElement form),
- Constructor(PasswordCredentialData data),
- Exposed=Window,
+[Exposed=Window,
  SecureContext]
 interface PasswordCredential : Credential {
+  constructor(HTMLFormElement form);
+  constructor(PasswordCredentialData data);
   readonly attribute USVString password;
 };
 PasswordCredential includes CredentialUserData;
@@ -72,10 +72,10 @@ partial dictionary CredentialCreationOptions {
   PasswordCredentialInit password;
 };
 
-[Constructor(FederatedCredentialInit data),
- Exposed=Window,
+[Exposed=Window,
  SecureContext]
 interface FederatedCredential : Credential {
+  constructor(FederatedCredentialInit data);
   readonly attribute USVString provider;
   readonly attribute DOMString? protocol;
 };
diff --git a/tests/wpt/web-platform-tests/mediacapture-streams/MediaDevices-enumerateDevices-returned-objects.https.html b/tests/wpt/web-platform-tests/mediacapture-streams/MediaDevices-enumerateDevices-returned-objects.https.html
new file mode 100644
index 00000000000..177beb6c2b9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mediacapture-streams/MediaDevices-enumerateDevices-returned-objects.https.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+<head>
+<title>enumerateDevices is returning new MediaDeviceInfo objects every time</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+</head>
+<body>
+<script>
+function doTest(callGetUserMedia, testName)
+{
+    promise_test(async () => {
+        if (callGetUserMedia)
+            await navigator.mediaDevices.getUserMedia({audio : true, video: true});
+
+        const deviceList1 =  await navigator.mediaDevices.enumerateDevices();
+        const deviceList2 =  await navigator.mediaDevices.enumerateDevices();
+
+        assert_equals(deviceList1.length, deviceList2.length);
+        for (let i = 0; i < deviceList1.length; i++) {
+            const device1 = deviceList1[i];
+            const device2 = deviceList2[i];
+            assert_not_equals(device1, device2);
+            assert_equals(device1.deviceId, device2.deviceId, "deviceId");
+            assert_equals(device1.kind, device2.kind, "kind");
+        }
+    }, testName);
+}
+
+doTest(false, "enumerateDevices returns new objects in case device-info permission is not granted");
+doTest(true, "enumerateDevices returns new objects in case device-info permission is granted");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.manual.window.js b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.manual.window.js
new file mode 100644
index 00000000000..4bfe84e9c4a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.manual.window.js
@@ -0,0 +1,6 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/native-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error.tentative.https.manual.window.js b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error.tentative.https.manual.window.js
new file mode 100644
index 00000000000..e45271c7793
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-Error.tentative.https.manual.window.js
@@ -0,0 +1,8 @@
+// META: script=/common/get-host-info.sub.js
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/native-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-Error.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.manual.window.js b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.manual.window.js
new file mode 100644
index 00000000000..408b32f13a3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.manual.window.js
@@ -0,0 +1,7 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/native-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-MessagePort.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage.tentative.https.manual.window.js b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage.tentative.https.manual.window.js
new file mode 100644
index 00000000000..6045812bff5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/native_FileSystemBaseHandle-postMessage.tentative.https.manual.window.js
@@ -0,0 +1,7 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/native-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/message-target-dedicated-worker.js b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-dedicated-worker.js
new file mode 100644
index 00000000000..26ff23ef8ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-dedicated-worker.js
@@ -0,0 +1,9 @@
+'use strict';
+
+importScripts(
+  'test-helpers.js',
+  'messaging-serialize-helpers.js',
+  'message-target.js'
+);
+
+add_message_event_handlers(/*receiver=*/self, /*target=*/self);
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/message-target-service-worker.js b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-service-worker.js
new file mode 100644
index 00000000000..4a6174ae3b5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-service-worker.js
@@ -0,0 +1,9 @@
+'use strict';
+
+importScripts(
+  'test-helpers.js',
+  'messaging-serialize-helpers.js',
+  'message-target.js'
+);
+
+add_message_event_handlers(/*receiver=*/self);
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/message-target-shared-worker.js b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-shared-worker.js
new file mode 100644
index 00000000000..6829c61d4cf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/message-target-shared-worker.js
@@ -0,0 +1,14 @@
+'use strict';
+
+importScripts(
+  'test-helpers.js',
+  'messaging-serialize-helpers.js',
+  'message-target.js'
+);
+
+self.addEventListener('connect', connect_event => {
+  const message_port = connect_event.ports[0];
+  add_message_event_handlers(
+    /*receiver=*/message_port, /*target=*/message_port);
+  message_port.start();
+});
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/message-target.html b/tests/wpt/web-platform-tests/native-file-system/resources/message-target.html
new file mode 100644
index 00000000000..32c7f0c56c6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/message-target.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<script src='test-helpers.js'></script>
+<script src='messaging-serialize-helpers.js'></script>
+<script src='message-target.js'></script>
+<script id="inline_script">
+  'use strict'
+
+  if (window.parent !== null) {
+    window.parent.postMessage('LOADED', { targetOrigin: '*' });
+  }
+
+  if (window.opener !== null) {
+    window.opener.postMessage('LOADED', { targetOrigin: '*' });
+  }
+
+  // Use an undefined message target to send responses to
+  // MessageEvent::source instead.
+  const target = undefined;
+
+  add_message_event_handlers(
+    /*receiver=*/self, target, /*target_origin=*/'*');
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/message-target.js b/tests/wpt/web-platform-tests/native-file-system/resources/message-target.js
new file mode 100644
index 00000000000..b9c0e4f8565
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/message-target.js
@@ -0,0 +1,145 @@
+'use strict';
+
+// This script depends on the following scripts:
+//    /native-file-system/resources/messaging-helpers.js
+//    /native-file-system/resources/test-helpers.js
+
+// add_message_event_handlers() is the helper function used to setup all
+// message targets, including iframes and workers.
+//
+// Adds a message event handler and a message error handler to |receiver|.
+// The 'data' property from received MessageEvents must include a 'type'
+// property. The 'type' selects the test logic to run. Most message type
+// handlers use postMessage() to respond to the sender with test results.
+// The sender then validates the test results after receiving the response.
+//
+// Both |target| and |target_origin| are optional. |target| is used
+// to send message responses back to the sender. When omitted, the
+// 'source' from received MessageEvents is used instead.
+//
+// For window messaging, |target_origin| specifies the origin to receive
+// responses. Most window tests use '*' for the |target_origin|. Worker
+// and message port tests must use undefined for |target_origin| to avoid
+// exceptions.
+function add_message_event_handlers(receiver, target, target_origin) {
+  receiver.addEventListener('message', async function (message_event) {
+    const message_data = message_event.data;
+
+    // Reply to the sender using the 'source' from the received MessageEvent.
+    let message_source = message_event.source;
+    if (message_source === null) {
+      // However, some message senders, like DedicatedWorkers, don't include
+      // a source. Fallback to the target when the source is null.
+      message_source = target;
+    }
+
+    try {
+      switch (message_data.type) {
+        case 'receive-message-port':
+          // Receive a MessagePort to use as a message target for testing.
+          add_message_event_handlers(
+            /*receiver=*/message_data.message_port,
+            /*target=*/message_data.message_port);
+          message_data.message_port.start();
+          break;
+
+        case 'create-broadcast-channel':
+          // Create a BroadcastChannel to use as a message target for testing.
+          const broadcast_channel =
+            new BroadcastChannel(message_data.broadcast_channel_name);
+          add_message_event_handlers(
+            /*receiver=*/broadcast_channel,
+            /*target=*/broadcast_channel);
+          message_source.postMessage(
+            { type: 'broadcast-channel-created' },
+            { targetOrigin: target_origin });
+          break;
+
+        case 'receive-file-system-handles':
+          // Receive a list of cloned FileSystemFileHandles. Access the
+          // properties of each FileSystemFileHandle by serializing the
+          // handle to a JavaScript object. Then respond with the serialized
+          // results, enabling the sender to verify that the cloned handle
+          // produced the expected property values from this execution context.
+          const serialized_handles = [];
+          const cloned_handles = message_data.cloned_handles;
+          for (let i = 0; i < cloned_handles.length; ++i) {
+            const serialized = await serialize_handle(cloned_handles[i]);
+            serialized_handles.push(serialized);
+          }
+          message_source.postMessage({
+            type: 'receive-serialized-file-system-handles',
+            serialized_handles,
+            // Respond with the cloned handles to create new clones for
+            // the sender to verify.
+            cloned_handles,
+          }, { targetOrigin: target_origin });
+          break;
+
+        case 'receive-serialized-file-system-handles':
+          // Do nothing. This message is meant for test runner validation.
+          // Other message targets may receive this message while testing
+          // broadcast channels.
+          break;
+
+        case 'create-file':
+          // Create a new file and then respond to the sender with it.
+          const directory =
+            await FileSystemDirectoryHandle.getSystemDirectory(
+              { type: 'sandbox' });
+          const file_handle =
+            await directory.getFile('temp-file', { create: true });
+          message_source.postMessage(
+            { type: 'receive-file', file_handle },
+            { targetOrigin: target_origin });
+          break;
+
+        case 'create-directory':
+          // Create a new directory and then respond to the sender with it.
+          const parent_directory =
+            await FileSystemDirectoryHandle.getSystemDirectory(
+              { type: 'sandbox' });
+          const directory_handle =
+            await parent_directory.getDirectory('temp-directory',
+              { create: true });
+          message_source.postMessage(
+            { type: 'receive-directory', directory_handle },
+            { targetOrigin: target_origin });
+          break;
+
+        default:
+          throw `Unknown message type: '${message_data.type}'`;
+      }
+    } catch (error) {
+      // Respond with an error to trigger a failure in the sender's
+      // test runner.
+      message_source.postMessage(`ERROR: ${error}`,
+        { targetOrigin: target_origin });
+    }
+  });
+
+  receiver.addEventListener('messageerror', async function (message_event) {
+    // Select the target for message responses (see comment in 'message' event
+    // listener above).
+    let message_source = message_event.source;
+    if (message_source === null) {
+      message_source = target;
+    }
+
+    try {
+      // Respond with the MessageEvent's property values, enabling the sender
+      // to verify results.
+      const serialized_message_error_event =
+        serialize_message_error_event(message_event);
+      message_source.postMessage({
+        type: 'serialized-message-error',
+        serialized_message_error_event
+      }, { targetOrigin: target_origin });
+    } catch (error) {
+      // Respond with an error to trigger a failure in the sender's
+      // test runner.
+      message_source.postMessage(`ERROR: ${error}`,
+        { targetOrigin: target_origin });
+    }
+  });
+}
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/messaging-blob-helpers.js b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-blob-helpers.js
new file mode 100644
index 00000000000..852f2e2d321
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-blob-helpers.js
@@ -0,0 +1,51 @@
+'use strict';
+
+// Creates a blob URL with the contents of 'message-target.html'. Use the
+// blob as an iframe src or a window.open() URL, which creates a same origin
+// message target.
+async function create_message_target_blob_url(test) {
+  const html = await create_message_target_html_without_subresources(test);
+  const blob = new Blob([html], { type: 'text/html' });
+  return URL.createObjectURL(blob);
+}
+
+// Creates a data URI with the contents of 'message-target.html'. Use the
+// data URI as an iframe src, which creates a cross origin message target.
+async function create_message_target_data_uri(test) {
+  const iframe_html =
+    await create_message_target_html_without_subresources(test);
+  return `data:text/html,${encodeURIComponent(iframe_html)}`;
+}
+
+// Constructs a version of 'message-target.html' without any subresources.
+// Enables the creation of blob URLs, data URIs and iframe srcdocs re-using
+// the contents of 'message-target.html'.
+async function create_message_target_html_without_subresources(test) {
+  const test_helpers_script = await fetch_text('resources/test-helpers.js');
+
+  const messaging_helpers_script =
+    await fetch_text('resources/messaging-helpers.js');
+
+  const messaging_serialize_helpers_script =
+    await fetch_text('resources/messaging-serialize-helpers.js');
+
+  const message_target_script =
+    await fetch_text('resources/message-target.js');
+
+  // Get the inline script code from 'message-target.html'.
+  const iframe = await add_iframe(test, { src: 'resources/message-target.html' });
+  const iframe_script =
+    iframe.contentWindow.document.getElementById('inline_script').outerHTML;
+  iframe.remove();
+
+  return '<!DOCTYPE html>' +
+    `<script>${test_helpers_script}</script>` +
+    `<script>${messaging_serialize_helpers_script}</script>` +
+    `<script>${message_target_script}</script>` +
+    `${iframe_script}`;
+}
+
+async function fetch_text(url) {
+  const response = await fetch(url);
+  return await response.text();
+}
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/messaging-helpers.js b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-helpers.js
new file mode 100644
index 00000000000..aae6e25d861
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-helpers.js
@@ -0,0 +1,177 @@
+'use strict';
+
+// This script depends on the following script:
+//    /native-file-system/resources/test-helpers.js
+//    /service-workers/service-worker/resources/test-helpers.sub.js
+
+// Define the URL constants used for each type of message target, including
+// iframes and workers.
+const kDocumentMessageTarget = 'resources/message-target.html';
+const kSharedWorkerMessageTarget = 'resources/message-target-shared-worker.js';
+const kServiceWorkerMessageTarget =
+  'resources/message-target-service-worker.js';
+const kDedicatedWorkerMessageTarget =
+  'resources/message-target-dedicated-worker.js';
+
+function create_dedicated_worker(test, url) {
+  const dedicated_worker = new Worker(url);
+  test.add_cleanup(() => {
+    dedicated_worker.terminate();
+  });
+  return dedicated_worker;
+}
+
+async function create_service_worker(test, script_url, scope) {
+  const registration = await service_worker_unregister_and_register(
+    test, script_url, scope);
+  test.add_cleanup(() => {
+    return registration.unregister();
+  });
+  return registration;
+}
+
+// Creates an iframe and waits to receive a message from the iframe.
+// Valid |options| include src, srcdoc and sandbox, which mirror the
+// corresponding iframe element properties.
+async function add_iframe(test, options) {
+  const iframe = document.createElement('iframe');
+
+  if (options.sandbox !== undefined) {
+    iframe.sandbox = options.sandbox;
+  }
+
+  if (options.src !== undefined) {
+    iframe.src = options.src;
+  }
+
+  if (options.srcdoc !== undefined) {
+    iframe.srcdoc = options.srcdoc;
+  }
+
+  document.body.appendChild(iframe);
+  test.add_cleanup(() => {
+    iframe.remove();
+  });
+
+  await wait_for_loaded_message(self);
+  return iframe;
+}
+
+// Creates a child window using window.open() and waits to receive a message
+// from the child window.
+async function open_window(test, url) {
+  const child_window = window.open(url);
+  test.add_cleanup(() => {
+    child_window.close();
+  });
+  await wait_for_loaded_message(self);
+  return child_window;
+}
+
+// Wait until |receiver| gets a message event with the data set to 'LOADED'.
+// The postMessage() tests use messaging instead of the loaded event because
+// cross-origin child windows from window.open() do not dispatch the loaded
+// event to the parent window.
+async function wait_for_loaded_message(receiver) {
+  const message_promise = new Promise((resolve, reject) => {
+    receiver.addEventListener('message', message_event => {
+      if (message_event.data === 'LOADED') {
+        resolve();
+      } else {
+        reject('The message target must receive a "LOADED" message response.');
+      }
+    });
+  });
+  await message_promise;
+}
+
+// Sets up a new message channel. Sends one port to |target| and then returns
+// the other port.
+function create_message_channel(target, target_origin) {
+  const message_channel = new MessageChannel();
+
+  const message_data =
+    { type: 'receive-message-port', message_port: message_channel.port2 };
+  target.postMessage(
+    message_data,
+    {
+      transfer: [message_channel.port2],
+      targetOrigin: target_origin
+    });
+  message_channel.port1.start();
+  return message_channel.port1;
+}
+
+// Creates a variety of different FileSystemFileHandles for testing.
+async function create_file_system_handles(test, root) {
+  // Create some files to use with postMessage().
+  const empty_file = await createEmptyFile(test, 'empty-file', root);
+  const first_file = await createFileWithContents(
+    test, 'first-file-with-contents', 'first-text-content', root);
+  const second_file = await createFileWithContents(
+    test, 'second-file-with-contents', 'second-text-content', root);
+
+  // Create an empty directory to use with postMessage().
+  const empty_directory = await createDirectory(test, 'empty-directory', root);
+
+  // Create a directory containing both files and subdirectories to use
+  // with postMessage().
+  const directory_with_files =
+    await createDirectory(test, 'directory-with-files', root);
+  await createFileWithContents(test, 'first-file-in-directory',
+    'first-directory-text-content', directory_with_files);
+  await createFileWithContents(test, 'second-file-in-directory',
+    'second-directory-text-content', directory_with_files);
+  const subdirectory =
+    await createDirectory(test, 'subdirectory', directory_with_files);
+  await createFileWithContents(test, 'first-file-in-subdirectory',
+    'first-subdirectory-text-content', subdirectory);
+
+  return [
+    empty_file,
+    first_file,
+    second_file,
+    // Include the same FileSystemFileHandle twice.
+    second_file,
+    empty_directory,
+    // Include the Same FileSystemDirectoryHandle object twice.
+    empty_directory,
+    directory_with_files
+  ];
+}
+
+// Tests sending an array of FileSystemHandles to |target| with postMessage().
+// The array includes both FileSystemFileHandles and FileSystemDirectoryHandles.
+// After receiving the message, |target| accesses all cloned handles by
+// serializing the properties of each handle to a JavaScript object.
+//
+// |target| then responds with the resulting array of serialized handles. The
+// response also includes the array of cloned handles, which creates more
+// clones. After receiving the response, this test runner verifies that both
+// the serialized handles and the cloned handles contain the expected properties.
+async function do_post_message_test(
+  test, root_dir, receiver, target, target_origin) {
+  // Create and send the handles to |target|.
+  const handles =
+    await create_file_system_handles(test, root_dir, target, target_origin);
+  target.postMessage(
+    { type: 'receive-file-system-handles', cloned_handles: handles },
+    { targetOrigin: target_origin });
+
+  // Wait for |target| to respond with results.
+  const event_watcher = new EventWatcher(test, receiver, 'message');
+  const message_event = await event_watcher.wait_for('message');
+  const response = message_event.data;
+
+  assert_equals(response.type, 'receive-serialized-file-system-handles',
+    'The test runner must receive a "serialized-file-system-handles" ' +
+    `message response. Actual response: ${response}`);
+
+  // Verify the results.
+  const expected_serialized_handles = await serialize_handles(handles);
+
+  assert_equals_serialized_handles(
+    response.serialized_handles, expected_serialized_handles);
+
+  await assert_equals_cloned_handles(response.cloned_handles, handles);
+}
diff --git a/tests/wpt/web-platform-tests/native-file-system/resources/messaging-serialize-helpers.js b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-serialize-helpers.js
new file mode 100644
index 00000000000..4a4b350cf91
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/resources/messaging-serialize-helpers.js
@@ -0,0 +1,234 @@
+'use strict';
+
+// This script depends on the following script:
+//    /native-file-system/resources/test-helpers.js
+
+// Serializes an array of FileSystemHandles where each element can be either a
+// FileSystemFileHandle or FileSystemDirectoryHandle.
+async function serialize_handles(handle_array) {
+  const serialized_handle_array = [];
+  for (let i = 0; i < handle_array.length; ++i) {
+    serialized_handle_array.push(await serialize_handle(handle_array[i]));
+  }
+  return serialized_handle_array;
+}
+
+// Serializes either a FileSystemFileHandle or FileSystemDirectoryHandle.
+async function serialize_handle(handle) {
+  let serialized;
+  if (handle.isDirectory) {
+    serialized = await serialize_file_system_directory_handle(handle);
+  } else if (handle.isFile) {
+    serialized = await serialize_file_system_file_handle(handle);
+  } else {
+    throw 'Object is not a FileSystemFileHandle or ' +
+    `FileSystemDirectoryHandle ${handle}`;
+  }
+  return serialized;
+}
+
+// Creates a dictionary for a FileSystemHandle base, which contains
+// serialized properties shared by both FileSystemFileHandle and
+// FileSystemDirectoryHandle.
+async function serialize_file_system_handle(handle) {
+  const read_permission =
+    await handle.queryPermission({ writable: false });
+
+  const write_permission =
+    await handle.queryPermission({ writable: true })
+
+  return {
+    is_file: handle.isFile,
+    is_directory: handle.isDirectory,
+    name: handle.name,
+    read_permission,
+    write_permission
+  };
+}
+
+// Create a dictionary with each property value in FileSystemFileHandle.
+// Also, reads the contents of the file to include with the returned
+// dictionary.  Example output:
+// {
+//   is_file: true,
+//   is_directory: false,
+//   name: "example-file-name"
+//   read_permission: "granted",
+//   write_permission: "granted",
+//   contents: "example-file-contents"
+// }
+async function serialize_file_system_file_handle(file_handle) {
+  const contents = await getFileContents(file_handle);
+
+  const serialized_file_system_handle =
+    await serialize_file_system_handle(file_handle);
+
+  return Object.assign(serialized_file_system_handle, { contents });
+}
+
+// Create a dictionary with each property value in FileSystemDirectoryHandle.
+// Example output:
+// {
+//   is_file: false,
+//   is_directory: true,
+//   name: "example-directory-name"
+//   read_permission: "granted",
+//   write_permission: "granted",
+//   files: [<first serialized file>, ...]
+//   directories: [<first serialized subdirectory>, ...]
+// }
+async function serialize_file_system_directory_handle(directory_handle) {
+  // Serialize the contents of the directory.
+  const serialized_files = [];
+  const serialized_directories = [];
+  for await (const child_handle of directory_handle.getEntries()) {
+    const serialized_child_handle = await serialize_handle(child_handle);
+    if (child_handle.isDirectory) {
+      serialized_directories.push(serialized_child_handle);
+    } else {
+      serialized_files.push(serialized_child_handle);
+    }
+  }
+
+  // Order the serialized contents of the directory by name.
+  serialized_files.sort((left, right) => {
+    return left.name.localeCompare(right.name);
+  });
+  serialized_directories.sort((left, right) => {
+    return left.name.localeCompare(right.name);
+  });
+
+  // Serialize the directory's common properties shared by all
+  // FileSystemHandles.
+  const serialized_file_system_handle =
+    await serialize_file_system_handle(directory_handle);
+
+  return Object.assign(
+    serialized_file_system_handle,
+    { files: serialized_files, directories: serialized_directories });
+}
+
+// Verifies |left_array| is a clone of |right_array| where each element
+// is a cloned FileSystemHandle with the same properties and contents.
+async function assert_equals_cloned_handles(left_array, right_array) {
+  assert_equals(left_array.length, right_array.length,
+    'Each array of FileSystemHandles must have the same length');
+
+  for (let i = 0; i < left_array.length; ++i) {
+    assert_not_equals(left_array[i], right_array[i],
+      'Clones must create new FileSystemHandle instances.');
+
+    const left_serialized = await serialize_handle(left_array[i]);
+    const right_serialized = await serialize_handle(right_array[i]);
+    assert_equals_serialized_handle(left_serialized, right_serialized);
+  }
+}
+
+// Verifies |left_array| is the same as |right_array| where each element
+// is a serialized FileSystemHandle with the same properties.
+function assert_equals_serialized_handles(left_array, right_array) {
+  assert_equals(left_array.length, right_array.length,
+    'Each array of serialized handles must have the same length');
+
+  for (let i = 0; i < left_array.length; ++i) {
+    assert_equals_serialized_handle(left_array[i], right_array[i]);
+  }
+}
+
+// Verifies each property of a serialized FileSystemFileHandle or
+// FileSystemDirectoryHandle.
+function assert_equals_serialized_handle(left, right) {
+  if (left.is_directory) {
+    assert_equals_serialized_file_system_directory_handle(left, right);
+  } else if (left.is_file) {
+    assert_equals_serialized_file_system_file_handle(left, right);
+  } else {
+    throw 'Object is not a FileSystemFileHandle or ' +
+    `FileSystemDirectoryHandle ${handle}`;
+  }
+}
+
+// Compares the output of serialize_file_system_handle() for
+// two FileSystemHandles.
+function assert_equals_serialized_file_system_handle(left, right) {
+  assert_equals(left.is_file, right.is_file,
+    'Each FileSystemHandle instance must use the expected "isFile".');
+
+  assert_equals(left.is_directory, right.is_directory,
+    'Each FileSystemHandle instance must use the expected "isDirectory".');
+
+  assert_equals(left.name, right.name,
+    'Each FileSystemHandle instance must use the expected "name" ' +
+    ' property.');
+
+  assert_equals(left.read_permission, right.read_permission,
+    'Each FileSystemHandle instance must have the expected read ' +
+    ' permission.');
+
+  assert_equals(left.write_permission, right.write_permission,
+    'Each FileSystemHandle instance must have the expected write ' +
+    ' permission.');
+}
+
+// Compares the output of serialize_file_system_file_handle()
+// for two FileSystemFileHandle.
+function assert_equals_serialized_file_system_file_handle(left, right) {
+  assert_equals_serialized_file_system_handle(left, right);
+  assert_equals(left.contents, right.contents,
+    'Each FileSystemFileHandle instance must have the same contents.');
+}
+
+// Compares the output of serialize_file_system_directory_handle()
+// for two FileSystemDirectoryHandles.
+function assert_equals_serialized_file_system_directory_handle(left, right) {
+  assert_equals_serialized_file_system_handle(left, right);
+
+  assert_equals(left.files.length, right.files.length,
+    'Each FileSystemDirectoryHandle must contain the same number of ' +
+    'file children');
+
+  for (let i = 0; i < left.files.length; ++i) {
+    assert_equals_serialized_file_system_file_handle(
+      left.files[i], right.files[i]);
+  }
+
+  assert_equals(left.directories.length, right.directories.length,
+    'Each FileSystemDirectoryHandle must contain the same number of ' +
+    'directory children');
+
+  for (let i = 0; i < left.directories.length; ++i) {
+    assert_equals_serialized_file_system_directory_handle(
+      left.directories[i], right.directories[i]);
+  }
+}
+
+// Creates a dictionary with interesting property values from MessageEvent.
+function serialize_message_error_event(message_error_event) {
+  return {
+    data: message_error_event.data,
+    origin: message_error_event.origin,
+    last_event_id: message_error_event.lastEventId,
+    has_source: (message_error_event.source !== null),
+    ports_length: message_error_event.ports.length
+  };
+}
+
+// Compares the output of serialize_message_error_event() with an
+// expected result.
+function assert_equals_serialized_message_error_event(
+  serialized_event, expected_origin, expected_has_source) {
+  assert_equals(serialized_event.data, null,
+    'The message error event must set the "data" property to null.');
+
+  assert_equals(serialized_event.origin, expected_origin,
+    'The message error event must have the expected "origin" property.');
+
+  assert_equals(serialized_event.last_event_id, "",
+    'The message error event must set the "lastEventId" property to the empty string.');
+
+  assert_equals(serialized_event.has_source, expected_has_source,
+    'The message error event must have the expected "source" property.');
+
+  assert_equals(serialized_event.ports_length, 0,
+    'The message error event must not contain any message ports.');
+}
diff --git a/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js
new file mode 100644
index 00000000000..1995ab9b1f9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-BroadcastChannel.tentative.https.window.js
@@ -0,0 +1,6 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/sandboxed-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js
new file mode 100644
index 00000000000..f44957e2000
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-Error.tentative.https.window.js
@@ -0,0 +1,8 @@
+// META: script=/common/get-host-info.sub.js
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/sandboxed-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-Error.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.window.js b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.window.js
new file mode 100644
index 00000000000..043c6b39262
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage-MessagePort.tentative.https.window.js
@@ -0,0 +1,7 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/sandboxed-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage-MessagePort.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage.tentative.https.window.js b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage.tentative.https.window.js
new file mode 100644
index 00000000000..e010f6599e8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/sandboxed_FileSystemBaseHandle-postMessage.tentative.https.window.js
@@ -0,0 +1,7 @@
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=resources/test-helpers.js
+// META: script=resources/sandboxed-fs-test-helpers.js
+// META: script=resources/messaging-helpers.js
+// META: script=resources/messaging-blob-helpers.js
+// META: script=resources/messaging-serialize-helpers.js
+// META: script=script-tests/FileSystemBaseHandle-postMessage.js
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
new file mode 100644
index 00000000000..7daf65e39b6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-BroadcastChannel.js
@@ -0,0 +1,82 @@
+'use strict';
+
+// This script depends on the following scripts:
+//    /native-file-system/resources/messaging-helpers.js
+//    /native-file-system/resources/messaging-serialize-helpers.js
+//    /native-file-system/resources/test-helpers.js
+//    /service-workers/service-worker/resources/test-helpers.sub.js
+
+// Sets up a new broadcast channel in |target|. Posts a message instructing
+// |target| to open the broadcast channel using |broadcast_channel_name|.
+async function create_broadcast_channel(
+  test, broadcast_channel_name, receiver, target, target_origin) {
+  target.postMessage(
+    { type: 'create-broadcast-channel', broadcast_channel_name },
+    { targetOrigin: target_origin });
+  const event_watcher = new EventWatcher(test, receiver, 'message');
+
+  // Wait until |target| is listening to the broad cast channel.
+  const message_event = await event_watcher.wait_for('message');
+  assert_equals(message_event.data.type, 'broadcast-channel-created',
+    'The message target must receive a "broadcast-channel-created" message ' +
+    'response.');
+}
+
+// This test is very similar to 'FileSystemBaseHandle-postMessage.js'. It
+// starts by creating three message targets for the broadcast channel:
+// an iframe, dedicated worker and a service worker. After setup, an array
+// of FileSystemHandles is sent across the broadcast channel. The test
+// expects three responses -- one from each message target.
+directory_test(async (t, root) => {
+  const broadcast_channel_name = 'file-system-file-handle-channel';
+  const broadcast_channel = new BroadcastChannel(broadcast_channel_name);
+  const broadcast_channel_event_watcher =
+    new EventWatcher(t, broadcast_channel, 'message');
+
+  const iframe = await add_iframe(t, { src: kDocumentMessageTarget });
+  await create_broadcast_channel(
+    t, broadcast_channel_name, self, iframe.contentWindow, '*');
+
+  const scope = `${kServiceWorkerMessageTarget}` +
+    '?post-message-to-broadcast-channel-with-file-handle';
+
+  const registration = await create_service_worker(
+    t, kServiceWorkerMessageTarget, scope);
+
+  await create_broadcast_channel(
+    t, broadcast_channel_name,
+    navigator.serviceWorker, registration.installing);
+
+  const dedicated_worker =
+    create_dedicated_worker(t, kDedicatedWorkerMessageTarget);
+
+  await create_broadcast_channel(
+    t, broadcast_channel_name, dedicated_worker, dedicated_worker);
+
+  const handles = await create_file_system_handles(t, root);
+
+  broadcast_channel.postMessage(
+    { type: 'receive-file-system-handles', cloned_handles: handles });
+
+  const expected_response_count = 3;
+  const responses = [];
+  for (let i = 0; i < expected_response_count; ++i) {
+    const message_event =
+      await broadcast_channel_event_watcher.wait_for('message');
+    responses.push(message_event.data);
+  }
+
+  const expected_serialized_handles = await serialize_handles(handles);
+
+  for (let i = 0; i < responses.length; ++i) {
+    assert_equals(responses[i].type, 'receive-serialized-file-system-handles',
+      'The test runner must receive a "serialized-file-system-handles" ' +
+      `message response. Actual response: ${responses[i]}`);
+
+    assert_equals_serialized_handles(
+      responses[i].serialized_handles, expected_serialized_handles);
+
+    await assert_equals_cloned_handles(responses[i].cloned_handles, handles);
+  }
+}, 'Send and receive messages using a broadcast channel in an iframe, ' +
+'dedicated worker and service worker.');
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-Error.js b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-Error.js
new file mode 100644
index 00000000000..914b47bcf40
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-Error.js
@@ -0,0 +1,272 @@
+'use strict';
+
+// This script depends on the following scripts:
+//    /native-file-system/resources/messaging-helpers.js
+//    /native-file-system/resources/messaging-blob-helpers.js
+//    /native-file-system/resources/messaging-serialize-helpers.js
+//    /native-file-system/resources/test-helpers.js
+//    /common/get-host-info.sub.js
+//    /service-workers/service-worker/resources/test-helpers.sub.js
+
+// Define URL constants for cross origin windows.
+const kRemoteOrigin = get_host_info().HTTPS_REMOTE_ORIGIN;
+const kRemoteOriginDocumentMessageTarget = `${kRemoteOrigin}${base_path()}` +
+  kDocumentMessageTarget;
+
+// Sending a FileSystemHandle to a cross origin |target| through postMessage()
+// must dispatch the 'messageerror' event.
+//
+// This test sends a FileSystemHandle to |target|. |target| responds with a
+// serialized MessageEvent from the 'messageerror' event, allowing the test
+// runner to verify MessageEvent properties.
+async function do_send_message_error_test(
+  test,
+  root_dir,
+  receiver,
+  target,
+  target_origin,
+  // False when the MessageEvent's source is null.
+  expected_has_source,
+  // The origin of MessageEvents received by |target|.
+  expected_origin) {
+  const message_watcher = new EventWatcher(test, receiver, 'message');
+
+  // Send a file to |target|.
+  const file = await createFileWithContents(
+    test, 'test-error-file', 'test-error-file-contents', root_dir);
+  target.postMessage(
+    { type: 'receive-file-system-handles', cloned_file_system_handles: [file] },
+    { targetOrigin: target_origin });
+
+  // Wait for |target| to respond with results.
+  let message_event = await message_watcher.wait_for('message');
+  const first_response = message_event.data;
+  assert_equals(first_response.type, 'serialized-message-error',
+    'The test runner must receive a "serialized-message-error" message ' +
+    'in response to a FileSystemFileHandle message.');
+
+  // Verify the results.
+  assert_equals_serialized_message_error_event(
+    first_response.serialized_message_error_event,
+    expected_origin, expected_has_source);
+
+  // Send a directory to |target|.
+  const directory = await createDirectory(
+    test, 'test-error-directory', root_dir);
+
+  target.postMessage(
+    {
+      type: 'receive-file-system-handles',
+      cloned_file_system_handles: [directory]
+    }, { targetOrigin: target_origin });
+
+  // Wait for |target| to respond with results.
+  message_event = await message_watcher.wait_for('message');
+  const second_response = message_event.data;
+  assert_equals(second_response.type, 'serialized-message-error',
+    'The test runner must receive a "serialized-message-error" message ' +
+    'response to a FileSystemDirectoryHandle message.');
+
+  // Verify the results.
+  assert_equals_serialized_message_error_event(
+    second_response.serialized_message_error_event,
+    expected_origin, expected_has_source);
+}
+
+// This test receives a FileSystemHandle from |target|. This test runner
+// must dispatch the 'messageerror' event after receiving a handle from target.
+async function do_receive_message_error_test(
+  test,
+  receiver,
+  target,
+  target_origin,
+  // False when the MessageEvent's source is null.
+  expected_has_source,
+  // The origin of MessageEvents received by this test runner.
+  expected_origin) {
+  const error_watcher = new EventWatcher(test, receiver, 'messageerror');
+
+  // Receive a file from |target|.
+  target.postMessage(
+    { type: 'create-file' }, { targetOrigin: target_origin });
+  const first_error = await error_watcher.wait_for('messageerror');
+  const serialized_first_error = serialize_message_error_event(first_error);
+  assert_equals_serialized_message_error_event(
+    serialized_first_error, expected_origin, expected_has_source);
+
+  // Receive a directory from |target|.
+  target.postMessage(
+    { type: 'create-directory' }, { targetOrigin: target_origin });
+  const second_error = await error_watcher.wait_for('messageerror');
+  const serialized_second_error = serialize_message_error_event(second_error);
+  assert_equals_serialized_message_error_event(
+    serialized_second_error, expected_origin, expected_has_source);
+}
+
+// Performs the send message error test followed by the receive message error
+// test.
+async function do_send_and_receive_message_error_test(
+  test,
+  root_dir,
+  receiver,
+  target,
+  target_origin,
+  // False when the MessageEvent's source is null.
+  expected_has_source,
+  // The origin of MessageEvents received by |target|.
+  expected_origin,
+  // The origin of MessageEvents received by this test runner.
+  expected_remote_origin) {
+  await do_send_message_error_test(
+    test, root_dir, receiver, target, target_origin, expected_has_source,
+    expected_origin);
+  await do_receive_message_error_test(
+    test, receiver, target, target_origin, expected_has_source,
+    expected_remote_origin);
+}
+
+// Runs the same test as do_send_message_error_test(), but uses a MessagePort.
+// This test starts by establishing a message channel between the test runner
+// and |target|.
+async function do_send_message_port_error_test(
+  test, root_dir, target, target_origin) {
+  const message_port = create_message_channel(target, target_origin);
+  await do_send_message_error_test(
+    test, root_dir, /*receiver=*/message_port, /*target=*/message_port,
+    /*target_origin=*/undefined, /*expected_has_source=*/false,
+    /*expected_origin=*/'', /*expected_remote_origin=*/'');
+}
+
+// Runs the same test as do_receive_message_error_test(), but uses a MessagePort.
+async function do_receive_message_port_error_test(
+  test, target, target_origin) {
+  const message_port = create_message_channel(target, target_origin);
+  await do_receive_message_error_test(
+    test, /*receiver=*/message_port, /*target=*/message_port,
+    /*target_origin=*/undefined, /*expected_has_source=*/false,
+    /*expected_origin=*/'');
+}
+
+// Runs the same test as do_send_and_receive_message_error_test(), but uses a
+// MessagePort.
+async function do_send_and_receive_message_port_error_test(
+  test, root_dir, target, target_origin) {
+  await do_send_message_port_error_test(
+    test, root_dir, target, target_origin);
+  await do_receive_message_port_error_test(
+    test, target, target_origin);
+}
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(
+    t, { src: kRemoteOriginDocumentMessageTarget });
+  await do_send_and_receive_message_error_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+    /*target_origin=*/'*', /*expected_has_source=*/true,
+    /*expected_origin=*/location.origin,
+    /*expected_remote_origin=*/kRemoteOrigin);
+}, 'Fail to send and receive messages using a cross origin iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(t, { src: kRemoteOriginDocumentMessageTarget });
+  await do_send_and_receive_message_port_error_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Fail to send and receive messages using a cross origin message port in ' +
+'an iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(
+    t, { src: kDocumentMessageTarget, sandbox: 'allow-scripts' });
+
+  await do_send_message_error_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+    /*target_origin=*/'*', /*expected_has_source*/true,
+    /*expected_origin=*/location.origin);
+
+  // https://crbug.com/1014248 Should sandboxed iframes expose the
+  // NativeFileSystem?
+  //
+  // await do_receive_message_error_test(
+  //   t, /*receiver=*/self, /*target=*/iframe.contentWindow,
+  //   /*target_origin=*/'*', /*expected_has_source=*/true,
+  //   /*expected_origin=*/kRemoteOrigin);
+}, 'Fail to send and receive messages using a sandboxed iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(
+    t, { src: kDocumentMessageTarget, sandbox: 'allow-scripts' });
+  await do_send_message_port_error_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+
+  // https://crbug.com/1014248 Should sandboxed iframes expose the
+  // NativeFileSystem?
+  //
+  // await do_receive_message_port_error_test(
+  //   t, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Fail to send and receive messages using a message port in a sandboxed ' +
+'iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe_data_uri = await create_message_target_data_uri(t);
+  const iframe = await add_iframe(t, { src: iframe_data_uri });
+  await do_send_message_error_test(t, root_dir, /*receiver=*/self,
+    /*target=*/iframe.contentWindow, /*target_origin=*/'*',
+    /*expected_has_source*/true, /*expected_origin=*/location.origin);
+  // Do not test receiving FileSystemHandles from the data URI iframe.
+  // Data URI iframes are insecure and do not expose the NativeFileSystem APIs.
+}, 'Fail to send messages to a data URI iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe_data_uri = await create_message_target_data_uri(t);
+  const iframe = await add_iframe(t, { src: iframe_data_uri });
+  await do_send_message_port_error_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Fail to send messages using a message port in a data URI iframe.');
+
+directory_test(async (t, root_dir) => {
+  const child_window = await open_window(t, kRemoteOriginDocumentMessageTarget);
+  await do_send_and_receive_message_error_test(
+    t, root_dir, /*receiver=*/self, /*target=*/child_window, /*target_origin=*/'*',
+    /*expected_has_source=*/true, /*expected_origin=*/location.origin,
+    /*expected_remote_origin=*/kRemoteOrigin);
+}, 'Fail to send and receive messages using a cross origin window.');
+
+directory_test(async (t, root_dir) => {
+  const child_window = await open_window(t, kRemoteOriginDocumentMessageTarget);
+  await do_send_message_port_error_test(
+    t, root_dir, /*target=*/child_window, /*target_origin=*/'*');
+}, 'Fail to send and receive messages using a cross origin message port in ' +
+'a window.');
+
+directory_test(async (t, root_dir) => {
+  const url = `${kDocumentMessageTarget}?pipe=header(Content-Security-Policy` +
+    ', sandbox allow-scripts)';
+  const child_window = await open_window(t, url);
+  await do_send_message_error_test(
+    t, root_dir, /*receiver=*/self, /*target=*/child_window,
+    /*target_origin=*/'*', /*expected_has_source*/true,
+    /*expected_origin=*/location.origin);
+
+  // https://crbug.com/1014248 Should sandboxed windows expose the
+  // NativeFileSystem?
+  //
+  // await do_receive_message_error_test(
+  //   t, /*receiver=*/self, /*target=*/child_window,
+  //   /*target_origin=*/'*', /*expected_has_source=*/true,
+  //   /*expected_origin=*/kRemoteOrigin);
+}, 'Fail to send and receive messages using a sandboxed window.');
+
+directory_test(async (t, root_dir) => {
+  const url = `${kDocumentMessageTarget}?pipe=header(Content-Security-Policy` +
+    ', sandbox allow-scripts)';
+  const child_window = await open_window(t, url);
+  await do_send_message_port_error_test(
+    t, root_dir, /*target=*/child_window, /*target_origin=*/'*');
+
+  // https://crbug.com/1014248 Should sandboxed windows expose the
+  // NativeFileSystem?
+  //
+  // await do_receive_message_port_error_test(
+  //   t, /*target=*/child_window, /*target_origin=*/'*');
+}, 'Fail to send and receive messages using a message port in a sandboxed ' +
+'window.');
diff --git a/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-MessagePort.js b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-MessagePort.js
new file mode 100644
index 00000000000..aa1e9b200c8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage-MessagePort.js
@@ -0,0 +1,97 @@
+'use strict';
+
+// This script depends on the following scripts:
+//    /native-file-system/resources/messaging-helpers.js
+//    /native-file-system/resources/messaging-blob-helpers.js
+//    /native-file-system/resources/messaging-serialize-helpers.js
+//    /native-file-system/resources/test-helpers.js
+//    /service-workers/service-worker/resources/test-helpers.sub.js
+
+// Runs the same test as do_post_message_test(), but uses a MessagePort.
+// This test starts by establishing a message channel between the test runner
+// and |target|. Afterwards, the test sends FileSystemHandles through the
+// message port channel.
+async function do_message_port_test(test, root_dir, target, target_origin) {
+  const message_port = create_message_channel(target, target_origin);
+  await do_post_message_test(
+    test, root_dir, /*receiver=*/message_port, /*target=*/message_port);
+}
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(t, { src: kDocumentMessageTarget });
+  await do_message_port_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a same origin ' +
+'iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(t, {
+    src: kDocumentMessageTarget,
+    sandbox: 'allow-scripts allow-same-origin'
+  });
+  await do_message_port_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a sandboxed same ' +
+'origin iframe.');
+
+directory_test(async (t, root_dir) => {
+  const blob_url = await create_message_target_blob_url(t);
+  const iframe = await add_iframe(t, { src: blob_url });
+  await do_message_port_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a blob iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe_html = await create_message_target_html_without_subresources(t);
+  const iframe = await add_iframe(t, { srcdoc: iframe_html });
+  await do_message_port_test(
+    t, root_dir, /*target=*/iframe.contentWindow, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in an iframe srcdoc.');
+
+directory_test(async (t, root_dir) => {
+  const child_window = await open_window(t, kDocumentMessageTarget);
+  await do_message_port_test(
+    t, root_dir, /*target=*/child_window, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a same origin ' +
+'window.');
+
+directory_test(async (t, root_dir) => {
+  const blob_url = await create_message_target_blob_url(t);
+  const child_window = await open_window(t, blob_url);
+  await do_message_port_test(
+    t, root_dir, /*target=*/child_window, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a blob window.');
+
+directory_test(async (t, root_dir) => {
+  const url = `${kDocumentMessageTarget}?pipe=header(Content-Security-Policy` +
+    ', sandbox allow-scripts allow-same-origin)';
+  const child_window = await open_window(t, url);
+  await do_message_port_test(
+    t, root_dir, /*target=*/child_window, /*target_origin=*/'*');
+}, 'Send and receive messages using a message port in a sandboxed same ' +
+'origin window.');
+
+directory_test(async (t, root_dir) => {
+  const dedicated_worker =
+    create_dedicated_worker(t, kDedicatedWorkerMessageTarget);
+  await do_message_port_test(t, root_dir, /*target=*/dedicated_worker);
+}, 'Send and receive messages using a message port in a dedicated ' +
+'worker.');
+
+directory_test(async (t, root_dir) => {
+  const scope = `${kServiceWorkerMessageTarget}` +
+    '?post-message-to-message-port-with-file-handle';
+  const registration = await create_service_worker(
+    t, kServiceWorkerMessageTarget, scope);
+  await do_message_port_test(t, root_dir, /*target=*/registration.installing);
+}, 'Send and receive messages using a message port in a service ' +
+'worker.');
+
+if (self.SharedWorker !== undefined) {
+  directory_test(async (t, root_dir) => {
+    const shared_worker = new SharedWorker(kSharedWorkerMessageTarget);
+    shared_worker.port.start();
+    await do_message_port_test(t, root_dir, /*target=*/shared_worker.port);
+  }, 'Send and receive messages using a message port in a shared ' +
+  ' worker.');
+}
diff --git a/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage.js b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage.js
new file mode 100644
index 00000000000..d2b333a9057
--- /dev/null
+++ b/tests/wpt/web-platform-tests/native-file-system/script-tests/FileSystemBaseHandle-postMessage.js
@@ -0,0 +1,91 @@
+'use strict';
+
+// This script depends on the following scripts:
+//    /native-file-system/resources/messaging-helpers.js
+//    /native-file-system/resources/messaging-blob-helpers.js
+//    /native-file-system/resources/messaging-serialize-helpers.js
+//    /native-file-system/resources/test-helpers.js
+//    /service-workers/service-worker/resources/test-helpers.sub.js
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(t, { src: kDocumentMessageTarget });
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using a same origin iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe = await add_iframe(t, {
+    src: kDocumentMessageTarget,
+    sandbox: 'allow-scripts allow-same-origin'
+  });
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using a sandboxed same origin iframe.');
+
+directory_test(async (t, root_dir) => {
+  const blob_url = await create_message_target_blob_url(t);
+  const iframe = await add_iframe(t, { src: blob_url });
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+     /*target_origin=*/'*');
+}, 'Send and receive messages using a blob iframe.');
+
+directory_test(async (t, root_dir) => {
+  const iframe_html = await create_message_target_html_without_subresources(t);
+  const iframe = await add_iframe(t, { srcdoc: iframe_html });
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/iframe.contentWindow,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using an iframe srcdoc.');
+
+directory_test(async (t, root_dir) => {
+  const child_window = await open_window(t, kDocumentMessageTarget);
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/child_window,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using a same origin window.');
+
+directory_test(async (t, root_dir) => {
+  const blob_url = await create_message_target_blob_url(t);
+  const child_window = await open_window(t, blob_url);
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/child_window,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using a blob window.');
+
+directory_test(async (t, root_dir) => {
+  const url = `${kDocumentMessageTarget}?pipe=header(Content-Security-Policy` +
+    ', sandbox allow-scripts allow-same-origin)';
+  const child_window = await open_window(t, url);
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/self, /*target=*/child_window,
+    /*target_origin=*/'*');
+}, 'Send and receive messages using a sandboxed same origin window.');
+
+directory_test(async (t, root_dir) => {
+  const dedicated_worker =
+    create_dedicated_worker(t, kDedicatedWorkerMessageTarget);
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/dedicated_worker, /*target=*/dedicated_worker);
+}, 'Send and receive messages using a dedicated worker.');
+
+directory_test(async (t, root_dir) => {
+  const scope = `${kServiceWorkerMessageTarget}?post-message-with-file-handle`;
+  const registration = await create_service_worker(
+    t, kServiceWorkerMessageTarget, scope);
+  await do_post_message_test(
+    t, root_dir, /*receiver=*/navigator.serviceWorker,
+    /*target=*/registration.installing);
+}, 'Send and receive messages using a service worker.');
+
+if (self.SharedWorker !== undefined) {
+  directory_test(async (t, root_dir) => {
+    const shared_worker = new SharedWorker(kSharedWorkerMessageTarget);
+    shared_worker.port.start();
+    await do_post_message_test(
+      t, root_dir, /*receiver=*/shared_worker.port,
+      /*target=*/shared_worker.port);
+  }, 'Send and receive messages using a shared worker.');
+}
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error-worker.js b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error-worker.js
new file mode 100644
index 00000000000..788252cf3b3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error-worker.js
@@ -0,0 +1,22 @@
+importScripts("/resources/testharness.js");
+
+function doTest(event)
+{
+    if (!event.request.url.includes("fetch-error-test"))
+        return;
+
+    let counter = 0;
+    const stream = new ReadableStream({ pull: controller => {
+        switch (++counter) {
+        case 1:
+            controller.enqueue(new Uint8Array([1]));
+            return;
+        default:
+            // We asynchronously error the stream so that there is ample time to resolve the fetch promise and call text() on the response.
+            step_timeout(() => controller.error("Sorry"), 50);
+        }
+    }});
+    event.respondWith(new Response(stream));
+}
+
+self.addEventListener("fetch", doTest);
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html
new file mode 100644
index 00000000000..901c158f601
--- /dev/null
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/fetch-error.https.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+</head>
+<body>
+<script>
+var scope = "resources";
+var registration;
+
+promise_test(async (test) => {
+    registration = await navigator.serviceWorker.register("fetch-error-worker.js", { scope : scope });
+    var activeWorker = registration.active;
+    if (activeWorker)
+        return;
+    activeWorker = registration.installing;
+    return new Promise(resolve => {
+        activeWorker.addEventListener('statechange', () => {
+            if (activeWorker.state === "activated")
+                resolve();
+        });
+    });
+}, "Setup service worker");
+
+promise_test(async (test) => {
+    const iframe = await with_iframe(scope);
+
+    const response = await iframe.contentWindow.fetch("fetch-error-test");
+    await response.text().then(assert_unreached, (error) => { assert_true(error.message.includes("Sorry")); });
+    iframe.remove();
+}, "Make sure a load that makes progress does not time out");
+
+promise_test(async () => {
+    registration.unregister();
+}, "Unregister service worker");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/ci/epochs_update.sh b/tests/wpt/web-platform-tests/tools/ci/epochs_update.sh
new file mode 100755
index 00000000000..c95f9ca0f13
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/ci/epochs_update.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+set -ex
+
+SCRIPT_DIR=$(cd $(dirname "$0") && pwd -P)
+WPT_ROOT=$SCRIPT_DIR/../..
+cd $WPT_ROOT
+
+if [ -z "$GITHUB_TOKEN" ]; then
+    echo "GITHUB_TOKEN must be set as an environment variable"
+    exit 1
+fi
+
+REMOTE=https://x-access-token:$GITHUB_TOKEN@github.com/web-platform-tests/wpt.git
+
+git branch epochs/three_hourly $(./wpt rev-list --epoch 3h)
+# This is safe because `git push` will by default fail for a non-fast-forward
+# push, for example if the remote branch is ahead of the local branch.
+git push $REMOTE epochs/three_hourly
diff --git a/tests/wpt/web-platform-tests/update-built-tests.sh b/tests/wpt/web-platform-tests/update-built-tests.sh
index 3cb6dc0f0e6..1a33154898d 100755
--- a/tests/wpt/web-platform-tests/update-built-tests.sh
+++ b/tests/wpt/web-platform-tests/update-built-tests.sh
@@ -7,3 +7,4 @@ html/tools/build.sh
 offscreen-canvas/tools/build.sh
 python mimesniff/mime-types/resources/generated-mime-types.py
 python3 css/css-ui/tools/appearance-build-webkit-reftests.py
+python3 WebIDL/generate-setlike.py
diff --git a/tests/wpt/web-platform-tests/workers/semantics/interface-objects/003.any.js b/tests/wpt/web-platform-tests/workers/semantics/interface-objects/003.any.js
index 1942a4658df..ea95deda298 100644
--- a/tests/wpt/web-platform-tests/workers/semantics/interface-objects/003.any.js
+++ b/tests/wpt/web-platform-tests/workers/semantics/interface-objects/003.any.js
@@ -76,8 +76,8 @@ var expected = [
   "IDBTransaction",
 ];
 
-for (var i = 0; i < unexpected.length; ++i) {
+for (var i = 0; i < expected.length; ++i) {
   test(function() {
-    assert_true(unexpected[i] in self);
-  }, "The " + unexpected[i] + " interface object should not be exposed");
+    assert_true(expected[i] in self);
+  }, "The " + expected[i] + " interface object should be exposed");
 }