diff --git a/tests/wpt/metadata/FileAPI/blob/Blob-array-buffer.any.js.ini b/tests/wpt/metadata/FileAPI/blob/Blob-array-buffer.any.js.ini
new file mode 100644
index 00000000000..aff6150a13b
--- /dev/null
+++ b/tests/wpt/metadata/FileAPI/blob/Blob-array-buffer.any.js.ini
@@ -0,0 +1,27 @@
+[Blob-array-buffer.any.html]
+  [Blob.arrayBuffer() non-unicode input]
+    expected: FAIL
+
+  [Blob.arrayBuffer()]
+    expected: FAIL
+
+  [Blob.arrayBuffer() non-ascii input]
+    expected: FAIL
+
+  [Blob.arrayBuffer() empty Blob data]
+    expected: FAIL
+
+
+[Blob-array-buffer.any.worker.html]
+  [Blob.arrayBuffer() non-unicode input]
+    expected: FAIL
+
+  [Blob.arrayBuffer()]
+    expected: FAIL
+
+  [Blob.arrayBuffer() non-ascii input]
+    expected: FAIL
+
+  [Blob.arrayBuffer() empty Blob data]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/blob/Blob-stream.any.js.ini b/tests/wpt/metadata/FileAPI/blob/Blob-stream.any.js.ini
new file mode 100644
index 00000000000..c827cd7661f
--- /dev/null
+++ b/tests/wpt/metadata/FileAPI/blob/Blob-stream.any.js.ini
@@ -0,0 +1,21 @@
+[Blob-stream.any.worker.html]
+  [Blob.stream() empty Blob]
+    expected: FAIL
+
+  [Blob.stream()]
+    expected: FAIL
+
+  [Blob.stream() non-unicode input]
+    expected: FAIL
+
+
+[Blob-stream.any.html]
+  [Blob.stream() empty Blob]
+    expected: FAIL
+
+  [Blob.stream()]
+    expected: FAIL
+
+  [Blob.stream() non-unicode input]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/blob/Blob-text.any.js.ini b/tests/wpt/metadata/FileAPI/blob/Blob-text.any.js.ini
new file mode 100644
index 00000000000..1038fd55d04
--- /dev/null
+++ b/tests/wpt/metadata/FileAPI/blob/Blob-text.any.js.ini
@@ -0,0 +1,45 @@
+[Blob-text.any.html]
+  [Blob.text() different charset param in type option]
+    expected: FAIL
+
+  [Blob.text() different charset param with non-ascii input]
+    expected: FAIL
+
+  [Blob.text() multi-element array in constructor]
+    expected: FAIL
+
+  [Blob.text() invalid utf-8 input]
+    expected: FAIL
+
+  [Blob.text() non-unicode]
+    expected: FAIL
+
+  [Blob.text()]
+    expected: FAIL
+
+  [Blob.text() empty blob data]
+    expected: FAIL
+
+
+[Blob-text.any.worker.html]
+  [Blob.text() different charset param in type option]
+    expected: FAIL
+
+  [Blob.text() different charset param with non-ascii input]
+    expected: FAIL
+
+  [Blob.text() multi-element array in constructor]
+    expected: FAIL
+
+  [Blob.text() invalid utf-8 input]
+    expected: FAIL
+
+  [Blob.text() non-unicode]
+    expected: FAIL
+
+  [Blob.text()]
+    expected: FAIL
+
+  [Blob.text() empty blob data]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/idlharness.html.ini b/tests/wpt/metadata/FileAPI/idlharness.html.ini
index e0de309e99f..3c3fa133edc 100644
--- a/tests/wpt/metadata/FileAPI/idlharness.html.ini
+++ b/tests/wpt/metadata/FileAPI/idlharness.html.ini
@@ -18,3 +18,30 @@
   [File API automated IDL tests]
     expected: FAIL
 
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "text()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation stream()]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "arrayBuffer()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation text()]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "text()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "stream()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation arrayBuffer()]
+    expected: FAIL
+
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "stream()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "arrayBuffer()" with the proper type]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini b/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
index 5f2f46cbe25..7a8f638a336 100644
--- a/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
+++ b/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
@@ -30,3 +30,30 @@
   [idlharness]
     expected: FAIL
 
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "text()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation stream()]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "arrayBuffer()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation text()]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "text()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: new Blob(["TEST"\]) must inherit property "stream()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: operation arrayBuffer()]
+    expected: FAIL
+
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "stream()" with the proper type]
+    expected: FAIL
+
+  [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "arrayBuffer()" with the proper type]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 3ca5aafc9c4..19ff60052d7 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -292127,6 +292127,11 @@
      {}
     ]
    ],
+   "feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html.headers": [
+    [
+     {}
+    ]
+   ],
    "feature-policy/experimental-features/resources/animation-property-height.js": [
     [
      {}
@@ -319252,7 +319257,7 @@
      {}
     ]
    ],
-   "tools/manifest/tests/test_vcs.py": [
+   "tools/manifest/tests/test_utils.py": [
     [
      {}
     ]
@@ -337034,6 +337039,38 @@
      {}
     ]
    ],
+   "FileAPI/blob/Blob-array-buffer.any.js": [
+    [
+     "FileAPI/blob/Blob-array-buffer.any.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Array Buffer"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ],
+    [
+     "FileAPI/blob/Blob-array-buffer.any.worker.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Array Buffer"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ]
+   ],
    "FileAPI/blob/Blob-constructor-endings.html": [
     [
      "FileAPI/blob/Blob-constructor-endings.html",
@@ -337064,6 +337101,70 @@
      {}
     ]
    ],
+   "FileAPI/blob/Blob-stream.any.js": [
+    [
+     "FileAPI/blob/Blob-stream.any.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Stream"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ],
+    [
+     "FileAPI/blob/Blob-stream.any.worker.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Stream"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ]
+   ],
+   "FileAPI/blob/Blob-text.any.js": [
+    [
+     "FileAPI/blob/Blob-text.any.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Text"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ],
+    [
+     "FileAPI/blob/Blob-text.any.worker.html",
+     {
+      "script_metadata": [
+       [
+        "title",
+        "Blob Text"
+       ],
+       [
+        "script",
+        "../support/Blob.js"
+       ]
+      ]
+     }
+    ]
+   ],
    "FileAPI/file/File-constructor-endings.html": [
     [
      "FileAPI/file/File-constructor-endings.html",
@@ -360283,6 +360384,18 @@
      {}
     ]
    ],
+   "css/css-text-decor/parsing/text-decoration-line-invalid.html": [
+    [
+     "css/css-text-decor/parsing/text-decoration-line-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/parsing/text-decoration-line-valid.html": [
+    [
+     "css/css-text-decor/parsing/text-decoration-line-valid.html",
+     {}
+    ]
+   ],
    "css/css-text-decor/text-decoration-serialization.tentative.html": [
     [
      "css/css-text-decor/text-decoration-serialization.tentative.html",
@@ -380835,6 +380948,12 @@
      {}
     ]
    ],
+   "feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html": [
+    [
+     "feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html",
+     {}
+    ]
+   ],
    "feature-policy/experimental-features/sync-script.tentative.https.sub.html": [
     [
      "feature-policy/experimental-features/sync-script.tentative.https.sub.html",
@@ -384370,6 +384489,18 @@
      {}
     ]
    ],
+   "fetch/sec-metadata/prefetch.tentative.https.sub.html": [
+    [
+     "fetch/sec-metadata/prefetch.tentative.https.sub.html",
+     {}
+    ]
+   ],
+   "fetch/sec-metadata/preload.tentative.https.sub.html": [
+    [
+     "fetch/sec-metadata/preload.tentative.https.sub.html",
+     {}
+    ]
+   ],
    "fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html": [
     [
      "fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html",
@@ -387445,6 +387576,12 @@
      {}
     ]
    ],
+   "html/dom/elements/global-attributes/dataset-binding.window.js": [
+    [
+     "html/dom/elements/global-attributes/dataset-binding.window.html",
+     {}
+    ]
+   ],
    "html/dom/elements/global-attributes/dataset-delete.html": [
     [
      "html/dom/elements/global-attributes/dataset-delete.html",
@@ -416189,6 +416326,12 @@
      {}
     ]
    ],
+   "portals/portal-activate-event-constructor.html": [
+    [
+     "portals/portal-activate-event-constructor.html",
+     {}
+    ]
+   ],
    "portals/portal-activate-event.html": [
     [
      "portals/portal-activate-event.html",
@@ -442657,6 +442800,12 @@
      {}
     ]
    ],
+   "webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html": [
+    [
+     "webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html",
+     {}
+    ]
+   ],
    "webaudio/the-audio-api/the-audioworklet-interface/audioworkletglobalscope-sample-rate.https.html": [
     [
      "webaudio/the-audio-api/the-audioworklet-interface/audioworkletglobalscope-sample-rate.https.html",
@@ -478714,6 +478863,10 @@
    "506a59fec1eb33661658850254344e264c323c2e",
    "support"
   ],
+  "FileAPI/blob/Blob-array-buffer.any.js": [
+   "b72427fd5cfaf60ab665eb30e31a4654c4169d01",
+   "testharness"
+  ],
   "FileAPI/blob/Blob-constructor-endings.html": [
    "1dee99ff775da3562194719be06b711c246b30ef",
    "testharness"
@@ -478734,6 +478887,14 @@
    "03fe6ca5343bd1dbac65c2d885a7eb79f064d99e",
    "testharness"
   ],
+  "FileAPI/blob/Blob-stream.any.js": [
+   "894f09f8ece47cab1301b8b474285204a4b7c4f1",
+   "testharness"
+  ],
+  "FileAPI/blob/Blob-text.any.js": [
+   "960c96054627fce66631f7bf59516cc6797d8521",
+   "testharness"
+  ],
   "FileAPI/file/File-constructor-endings.html": [
    "f0f9090768f48e25fb7fd47e5cd182bf11f065e4",
    "testharness"
@@ -478867,7 +479028,7 @@
    "support"
   ],
   "FileAPI/support/Blob.js": [
-   "1d66f23a6040f37ded99531627d0bc1ebdd9130f",
+   "04069acd3ccbe713ad03f6e0a7d63f3e5a3c81b9",
    "support"
   ],
   "FileAPI/support/document-domain-setter.sub.html": [
@@ -602326,6 +602487,14 @@
    "633c5c00392711f1fe1911a07f9cf53c3cd702e9",
    "reftest"
   ],
+  "css/css-text-decor/parsing/text-decoration-line-invalid.html": [
+   "ec8d792c0a803dc726b01e762602b717befc5426",
+   "testharness"
+  ],
+  "css/css-text-decor/parsing/text-decoration-line-valid.html": [
+   "3dd2d0c834ec8c7340b093a4c7a1272fb35a8a26",
+   "testharness"
+  ],
   "css/css-text-decor/reference/line-through-vertical-ref.html": [
    "979512787a18ec9cbed7e9baf4b2cbd57ab99d33",
    "support"
@@ -640455,7 +640624,7 @@
    "testharness"
   ],
   "custom-elements/upgrading/Node-cloneNode.html": [
-   "1a8786e914b9974ce114e9cda227823b3ea4a161",
+   "364cecd76debd8b9657392641267be5f0918e84d",
    "testharness"
   ],
   "custom-elements/upgrading/upgrading-enqueue-reactions.html": [
@@ -640463,7 +640632,7 @@
    "testharness"
   ],
   "custom-elements/upgrading/upgrading-parser-created-element.html": [
-   "7cc3b18aeefb8db55bcac7ac1cf321c1b5fff28c",
+   "0f7f95786dd11fd7013f057fd492cc9b7c924db9",
    "testharness"
   ],
   "device-memory/META.yml": [
@@ -645770,6 +645939,14 @@
    "a913158982e04d34a79c662673a9754d457bb002",
    "testharness"
   ],
+  "feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html": [
+   "2a6faefcd3bcab4efe6147fa142fc7369efafc81",
+   "testharness"
+  ],
+  "feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html.headers": [
+   "8cba4d2df9c22809641984a0071aae947b4f91ae",
+   "support"
+  ],
   "feature-policy/experimental-features/resources/animation-property-height.js": [
    "79316cb488fade6e877c690f90c74961ff944f52",
    "support"
@@ -647842,6 +648019,14 @@
    "b60ae206c78b3dd8e934dde7a7408fe4a7465932",
    "testharness"
   ],
+  "fetch/sec-metadata/prefetch.tentative.https.sub.html": [
+   "2c230b8949688940067d9bbc151b12f59e20b517",
+   "testharness"
+  ],
+  "fetch/sec-metadata/preload.tentative.https.sub.html": [
+   "2fdf65d5920d5851416679eee21fd9362ca3d532",
+   "testharness"
+  ],
   "fetch/sec-metadata/redirect/cross-site-redirect.tentative.https.sub.html": [
    "06b58744fb5a26f16f5ed8fc923f1c91989e2eb8",
    "testharness"
@@ -647891,7 +648076,7 @@
    "support"
   ],
   "fetch/sec-metadata/resources/record-header.py": [
-   "f215b0165073ec6275308ed272cea763d9572a9e",
+   "683c0a6a0c4b6e32e06fce50aa8f6af19eacff76",
    "support"
   ],
   "fetch/sec-metadata/resources/sharedWorker.js": [
@@ -652330,6 +652515,10 @@
    "17077dafd1ff38298b052aa17fcc1e1062a83baf",
    "testharness"
   ],
+  "html/dom/elements/global-attributes/dataset-binding.window.js": [
+   "e0e85677d1d4c07533a5d8eaa6dc1268305fa0c6",
+   "testharness"
+  ],
   "html/dom/elements/global-attributes/dataset-delete.html": [
    "1440118f6daa531d2bfde982c67676d22cffa197",
    "testharness"
@@ -669295,7 +669484,7 @@
    "support"
   ],
   "interfaces/FileAPI.idl": [
-   "15b2e5582fee1c7fee29e7d20bb82b0ca901af73",
+   "b5b40296429646cfbe13110153f2e281201ba669",
    "support"
   ],
   "interfaces/IndexedDB.idl": [
@@ -682959,7 +683148,7 @@
    "testharness"
   ],
   "pointerevents/pointerlock/pointerevent_coordinates_when_locked.html": [
-   "2556e83da10d9b8ee36b8ebbe67d513597d2fe77",
+   "9dfd5e1764d33dfd1af7ee62af20b1e0424ac64b",
    "testharness"
   ],
   "pointerevents/pointerlock/pointerevent_movementxy-manual.html": [
@@ -683086,6 +683275,10 @@
    "0d8ec33cae787ddd0ed22284ed0a955e312d505d",
    "testharness"
   ],
+  "portals/portal-activate-event-constructor.html": [
+   "7263b121151f5b1331622c0c7007df49f90b6376",
+   "testharness"
+  ],
   "portals/portal-activate-event.html": [
    "33d91e37d9d9ac77c5243a60b42ce841645d248e",
    "testharness"
@@ -704503,7 +704696,7 @@
    "support"
   ],
   "tools/manifest/download.py": [
-   "e8f27e7ac100dad8d587a91d67e9a5f2ff0c3433",
+   "91ae664336e4c09ef165db25cf363e61fec3d603",
    "support"
   ],
   "tools/manifest/item.py": [
@@ -704515,7 +704708,7 @@
    "support"
   ],
   "tools/manifest/manifest.py": [
-   "bfe57c7823b26f778e81fb793a7cb9b0fdfd264a",
+   "8634b7089869fbbf9adb604909ebae09efdf36b3",
    "support"
   ],
   "tools/manifest/sourcefile.py": [
@@ -704542,20 +704735,20 @@
    "18aa55a63a2695b3f3581e1b7eee5042f5cea051",
    "support"
   ],
-  "tools/manifest/tests/test_vcs.py": [
-   "8124b9ac380d9e9826aa2d6493bb4802ae63372e",
+  "tools/manifest/tests/test_utils.py": [
+   "1bdffb9b1fe0f10b6e49768fd3bdd502f8aeb3fd",
    "support"
   ],
   "tools/manifest/update.py": [
-   "321cfebe2a605c9a50267129ed574127ed023634",
+   "f1a70930bb3377d86164767b71d985bad42c0104",
    "support"
   ],
   "tools/manifest/utils.py": [
-   "a097ad5090e16aa1a43c8e43332f0761ecd6f240",
+   "c3456d96604cb31d83de3d0a31dd0e259893e22c",
    "support"
   ],
   "tools/manifest/vcs.py": [
-   "cfb0ff27c364a5a66f85c264bbb4978ae56d9b5b",
+   "b63df4d0a8ae750a3a1edc7ee6c9eaa5fcc3718b",
    "support"
   ],
   "tools/py27-flake8.ini": [
@@ -713399,7 +713592,7 @@
    "support"
   ],
   "webaudio/resources/audit.js": [
-   "b7ca020161071437087c349c0e8b59dbf132f764",
+   "f3ce71911ac02d971157e31462b1c8d34f83f756",
    "support"
   ],
   "webaudio/resources/biquad-filters.js": [
@@ -713814,6 +714007,10 @@
    "8194d1977ad452390efb870197057bcf48fad499",
    "testharness"
   ],
+  "webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html": [
+   "d5bcbfe990cacbb09c3dc22334cd0620e66b9ced",
+   "testharness"
+  ],
   "webaudio/the-audio-api/the-audioworklet-interface/audioworkletglobalscope-sample-rate.https.html": [
    "d87e35b571d75c0ff595ab023f4a54a420111523",
    "testharness"
@@ -717583,7 +717780,7 @@
    "support"
   ],
   "webstorage/set.window.js": [
-   "479ad588910b907e6e9fe41d5080b744a22a54fe",
+   "228ce60296697a21520b8c635bd352ed1fbefb2c",
    "testharness"
   ],
   "webstorage/storage_builtins.html": [
@@ -720931,7 +721128,7 @@
    "testharness"
   ],
   "webxr/xrSession_transfer_outputContext.https.html": [
-   "69c52d2bfb4d8d942e233872b40c618accaad1b9",
+   "658cb322487df1af1f2333423ac8c223fdd8733c",
    "testharness"
   ],
   "workers/META.yml": [
diff --git a/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini b/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
index 9721e582130..7f5a43ceb95 100644
--- a/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
+++ b/tests/wpt/metadata/css/css-fonts/variations/at-font-face-font-matching.html.ini
@@ -314,3 +314,24 @@
   [Matching font-stretch: '90%' should prefer '110% 140%' over '120% 130%']
     expected: FAIL
 
+  [Matching font-weight: '500' should prefer '400' over '350 399']
+    expected: FAIL
+
+  [Matching font-weight: '399' should prefer '500 501' over '502 510']
+    expected: FAIL
+
+  [Matching font-style: 'normal' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
+    expected: FAIL
+
+  [Matching font-weight: '500' should prefer '350 399' over '351 398']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 21deg' should prefer 'oblique 20deg' over 'oblique 10deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -10deg' should prefer 'oblique -50deg -40deg' over 'italic']
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-text-decor/parsing/text-decoration-line-valid.html.ini b/tests/wpt/metadata/css/css-text-decor/parsing/text-decoration-line-valid.html.ini
new file mode 100644
index 00000000000..bb50604b3df
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text-decor/parsing/text-decoration-line-valid.html.ini
@@ -0,0 +1,7 @@
+[text-decoration-line-valid.html]
+  [e.style['text-decoration-line'\] = "spelling-error" should set the property value]
+    expected: FAIL
+
+  [e.style['text-decoration-line'\] = "grammar-error" should set the property value]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/upgrading/Node-cloneNode.html.ini b/tests/wpt/metadata/custom-elements/upgrading/Node-cloneNode.html.ini
index 47aab04dca8..4ef8083287b 100644
--- a/tests/wpt/metadata/custom-elements/upgrading/Node-cloneNode.html.ini
+++ b/tests/wpt/metadata/custom-elements/upgrading/Node-cloneNode.html.ini
@@ -2,3 +2,12 @@
   [Node.prototype.cloneNode(false) must be able to clone as a customized built-in element when it has an inconsistent "is" attribute]
     expected: FAIL
 
+  [HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself before super() call]
+    expected: FAIL
+
+  [Upgrading a custom element must throw TypeError when the custom element's constructor returns another element]
+    expected: FAIL
+
+  [HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself after super() call]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/upgrading/upgrading-parser-created-element.html.ini b/tests/wpt/metadata/custom-elements/upgrading/upgrading-parser-created-element.html.ini
new file mode 100644
index 00000000000..84e2a61bc0b
--- /dev/null
+++ b/tests/wpt/metadata/custom-elements/upgrading/upgrading-parser-created-element.html.ini
@@ -0,0 +1,16 @@
+[upgrading-parser-created-element.html]
+  [Upgrading a custom element whose constructor returns a Text node must throw]
+    expected: FAIL
+
+  [HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself after super() call]
+    expected: FAIL
+
+  [Upgrading a custom element whose constructor returns an Element must throw]
+    expected: FAIL
+
+  [Upgrading a custom element must throw an TypeError when the returned element is not SameValue as the upgraded element]
+    expected: FAIL
+
+  [HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed due to a custom element constructor constructing itself before super() call]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index 7b2de98b371..0a7d7b1f930 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -32,7 +32,7 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
-  expected: CRASH
+  expected: TIMEOUT
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     expected: FAIL
 
@@ -96,9 +96,6 @@
   [windows-1254: csisolatin5 (XMLHttpRequest)]
     expected: TIMEOUT
 
-  [windows-1254: iso8859-9 (XMLHttpRequest)]
-    expected: TIMEOUT
-
   [windows-1254: iso-ir-148 (XMLHttpRequest)]
     expected: TIMEOUT
 
@@ -126,5 +123,11 @@
   [windows-1256: windows-1256 (XMLHttpRequest)]
     expected: TIMEOUT
 
+  [windows-1254: l5 (XMLHttpRequest)]
+    expected: TIMEOUT
+
+  [windows-1254: latin5 (XMLHttpRequest)]
+    expected: TIMEOUT
+
 
 [single-byte-decoder.html?TextDecoder]
diff --git a/tests/wpt/metadata/fetch/sec-metadata/prefetch.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/prefetch.tentative.https.sub.html.ini
new file mode 100644
index 00000000000..ace4812ca1b
--- /dev/null
+++ b/tests/wpt/metadata/fetch/sec-metadata/prefetch.tentative.https.sub.html.ini
@@ -0,0 +1,14 @@
+[prefetch.tentative.https.sub.html]
+  expected: TIMEOUT
+  [<link rel='prefetch' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='prefetch' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='prefetch' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [Browser supports prefetch.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/preload.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/preload.tentative.https.sub.html.ini
new file mode 100644
index 00000000000..326d86df3ef
--- /dev/null
+++ b/tests/wpt/metadata/fetch/sec-metadata/preload.tentative.https.sub.html.ini
@@ -0,0 +1,59 @@
+[preload.tentative.https.sub.html]
+  expected: TIMEOUT
+  [<link rel='preload' as='fetch' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='script' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='font' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='script' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='track' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='image' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='image' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='track' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [Browser supports preload.]
+    expected: FAIL
+
+  [<link rel='preload' as='fetch' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='style' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='font' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='fetch' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='image' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='font' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='style' href='https://www.not-web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='script' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='track' href='https://www.web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
+  [<link rel='preload' as='style' href='https://web-platform.test:8443/...'>]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index dc2e45516de..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/closed-attribute.window.js.ini b/tests/wpt/metadata/html/browsers/the-window-object/closed-attribute.window.js.ini
index ede7a979848..0a61dc7e11e 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/closed-attribute.window.js.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/closed-attribute.window.js.ini
@@ -1,5 +1,4 @@
 [closed-attribute.window.html]
-  expected: CRASH
   [closed and cross-site nested browsing context]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/elements/global-attributes/dataset-binding.window.js.ini b/tests/wpt/metadata/html/dom/elements/global-attributes/dataset-binding.window.js.ini
new file mode 100644
index 00000000000..19996050bff
--- /dev/null
+++ b/tests/wpt/metadata/html/dom/elements/global-attributes/dataset-binding.window.js.ini
@@ -0,0 +1,13 @@
+[dataset-binding.window.html]
+  [Setting property for key x with accessor property on prototype]
+    expected: FAIL
+
+  [Setting property for key 9 with accessor property on prototype]
+    expected: FAIL
+
+  [Getting property descriptor for key 9]
+    expected: FAIL
+
+  [Getting property descriptor for key x]
+    expected: FAIL
+
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
deleted file mode 100644
index 8cc42056d34..00000000000
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ /dev/null
@@ -1,10 +0,0 @@
-[non-active-document.html]
-  [DOMParser]
-    expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
deleted file mode 100644
index 6cf9d13975c..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[iframe_005.html]
-  [document.write external script into iframe write back into parent]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/offscreen-canvas/the-offscreen-canvas/offscreencanvas.commit.w.html.ini b/tests/wpt/metadata/offscreen-canvas/the-offscreen-canvas/offscreencanvas.commit.w.html.ini
index b6e408b9b86..6c08b446ac6 100644
--- a/tests/wpt/metadata/offscreen-canvas/the-offscreen-canvas/offscreencanvas.commit.w.html.ini
+++ b/tests/wpt/metadata/offscreen-canvas/the-offscreen-canvas/offscreencanvas.commit.w.html.ini
@@ -1,5 +1,4 @@
 [offscreencanvas.commit.w.html]
-  expected: ERROR
   [Test that calling OffscreenCanvas's commit pushes its contents to its placeholder.]
     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 66bd350083b..a56bad443a2 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
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html.ini
new file mode 100644
index 00000000000..289bde2ec04
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html.ini
@@ -0,0 +1,2 @@
+[audioworklet-suspend.https.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/webstorage/set.window.js.ini b/tests/wpt/metadata/webstorage/set.window.js.ini
index 687d23b09d1..e54c1a810ff 100644
--- a/tests/wpt/metadata/webstorage/set.window.js.ini
+++ b/tests/wpt/metadata/webstorage/set.window.js.ini
@@ -5,3 +5,9 @@
   [Setting property for key x on sessionStorage with accessor property on prototype]
     expected: FAIL
 
+  [Setting property for key 9 on localStorage with accessor property on prototype]
+    expected: FAIL
+
+  [Setting property for key 9 on sessionStorage with accessor property on prototype]
+    expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
deleted file mode 100644
index dbea4f293ad..00000000000
--- a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[transition_calc_implicit.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/FileAPI/blob/Blob-array-buffer.any.js b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-array-buffer.any.js
new file mode 100644
index 00000000000..b72427fd5cf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-array-buffer.any.js
@@ -0,0 +1,34 @@
+// META: title=Blob Array Buffer
+// META: script=../support/Blob.js
+'use strict';
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_true(array_buffer instanceof ArrayBuffer);
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer()")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_true(array_buffer instanceof ArrayBuffer);
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer() empty Blob data")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("\u08B8\u000a");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer() non-ascii input")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  const blob = new Blob([typed_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_equals_typed_array(new Uint8Array(array_buffer), typed_arr);
+}, "Blob.arrayBuffer() non-unicode input")
diff --git a/tests/wpt/web-platform-tests/FileAPI/blob/Blob-stream.any.js b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-stream.any.js
new file mode 100644
index 00000000000..894f09f8ece
--- /dev/null
+++ b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-stream.any.js
@@ -0,0 +1,50 @@
+// META: title=Blob Stream
+// META: script=../support/Blob.js
+'use strict';
+
+// Takes in a ReadableStream and reads from it until it is done, returning
+// an array that contains the results of each read operation
+async function read_all_chunks(stream) {
+  assert_true(stream instanceof ReadableStream);
+  assert_true('getReader' in stream);
+  const reader = stream.getReader();
+
+  assert_true('read' in reader);
+  let read_value = await reader.read();
+
+  let out = [];
+  let i = 0;
+  while (!read_value.done) {
+    for (let val of read_value.value) {
+      out[i++] = val;
+    }
+    read_value = await reader.read();
+  }
+  return out;
+}
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"]);
+  const stream = await blob.stream()
+  const chunks = await read_all_chunks(stream);
+  for (let [index, value] of chunks.entries()) {
+    assert_equals(value, "PASS".charCodeAt(index));
+  }
+}, "Blob.stream()")
+
+promise_test(async () => {
+  const blob = new Blob();
+  const stream = await blob.stream()
+  const chunks = await read_all_chunks(stream);
+
+  assert_array_equals(chunks, []);
+}, "Blob.stream() empty Blob")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  const blob = new Blob([typed_arr]);
+  const stream = await blob.stream()
+  const chunks = await read_all_chunks(stream);
+  assert_array_equals(chunks, input_arr)
+}, "Blob.stream() non-unicode input")
diff --git a/tests/wpt/web-platform-tests/FileAPI/blob/Blob-text.any.js b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-text.any.js
new file mode 100644
index 00000000000..960c9605462
--- /dev/null
+++ b/tests/wpt/web-platform-tests/FileAPI/blob/Blob-text.any.js
@@ -0,0 +1,52 @@
+// META: title=Blob Text
+// META: script=../support/Blob.js
+'use strict';
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"]);
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text()")
+
+promise_test(async () => {
+  const blob = new Blob();
+  const text = await blob.text();
+  assert_equals(text, "");
+}, "Blob.text() empty blob data")
+
+promise_test(async () => {
+  const blob = new Blob(["P", "A", "SS"]);
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text() multi-element array in constructor")
+
+promise_test(async () => {
+  const non_unicode = "\u0061\u030A";
+  const input_arr = new TextEncoder().encode(non_unicode);
+  const blob = new Blob([input_arr]);
+  const text = await blob.text();
+  assert_equals(text, non_unicode);
+}, "Blob.text() non-unicode")
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"], { type: "text/plain;charset=utf-16le" });
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text() different charset param in type option")
+
+promise_test(async () => {
+  const non_unicode = "\u0061\u030A";
+  const input_arr = new TextEncoder().encode(non_unicode);
+  const blob = new Blob([input_arr], { type: "text/plain;charset=utf-16le" });
+  const text = await blob.text();
+  assert_equals(text, non_unicode);
+}, "Blob.text() different charset param with non-ascii input")
+
+promise_test(async () => {
+  const input_arr = new Uint8Array([192, 193, 245, 246, 247, 248, 249, 250, 251,
+      252, 253, 254, 255]);
+  const blob = new Blob([input_arr]);
+  const text = await blob.text();
+  assert_equals(text, "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd" +
+      "\ufffd\ufffd\ufffd\ufffd");
+}, "Blob.text() invalid utf-8 input")
diff --git a/tests/wpt/web-platform-tests/FileAPI/support/Blob.js b/tests/wpt/web-platform-tests/FileAPI/support/Blob.js
index 1d66f23a604..04069acd3cc 100644
--- a/tests/wpt/web-platform-tests/FileAPI/support/Blob.js
+++ b/tests/wpt/web-platform-tests/FileAPI/support/Blob.js
@@ -1,3 +1,5 @@
+'use strict'
+
 function test_blob(fn, expectations) {
   var expected = expectations.expected,
       type = expectations.type,
@@ -47,3 +49,22 @@ function test_blob_binary(fn, expectations) {
     fr.readAsArrayBuffer(blob);
   });
 }
+
+// Assert that two TypedArray objects have the same byte values
+self.assert_equals_typed_array = (array1, array2) => {
+  const [view1, view2] = [array1, array2].map((array) => {
+    assert_true(array.buffer instanceof ArrayBuffer,
+      'Expect input ArrayBuffers to contain field `buffer`');
+    return new DataView(array.buffer, array.byteOffset, array.byteLength);
+  });
+
+  assert_equals(view1.byteLength, view2.byteLength,
+    'Expect both arrays to be of the same byte length');
+
+  const byteLength = view1.byteLength;
+
+  for (let i = 0; i < byteLength; ++i) {
+    assert_equals(view1.getUint8(i), view2.getUint8(i),
+      `Expect byte at buffer position ${i} to be equal`);
+  }
+}
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-invalid.html b/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-invalid.html
new file mode 100644
index 00000000000..ec8d792c0a8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-invalid.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Decoration Test: Parsing text-decoration-line with invalid values</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#text-decoration-line-property">
+<meta name="assert" content="text-decoration-line supports only the grammar 'none | [ underline || overline || line-through || blink ] | spelling-error | grammar-error'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+test_invalid_value("text-decoration-line", "auto");
+test_invalid_value("text-decoration-line", "null");
+test_invalid_value("text-decoration-line", "noone");
+test_invalid_value("text-decoration-line", "under-line");
+test_invalid_value("text-decoration-line", "over-line");
+test_invalid_value("text-decoration-line", "linethrough");
+test_invalid_value("text-decoration-line", "none underline");
+test_invalid_value("text-decoration-line", "none spelling-error");
+test_invalid_value("text-decoration-line", "underline underline");
+test_invalid_value("text-decoration-line", "underline none overline");
+test_invalid_value("text-decoration-line", "blink line-through blink");
+test_invalid_value("text-decoration-line", "spelling-error overline");
+test_invalid_value("text-decoration-line", "spelling-error grammar-error");
+test_invalid_value("text-decoration-line", "blink underline line-through grammar-error");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-valid.html b/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-valid.html
new file mode 100644
index 00000000000..3dd2d0c834e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/parsing/text-decoration-line-valid.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Decoration Test: Parsing text-decoration-line with valid values</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#text-decoration-line-property">
+<meta name="assert" content="text-decoration-line supports the full grammar 'none | [ underline || overline || line-through || blink ] | spelling-error | grammar-error'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+// none
+test_valid_value("text-decoration-line", "none");
+
+// underline || overline || line-through || blink
+test_valid_value("text-decoration-line", "underline");
+test_valid_value("text-decoration-line", "overline");
+test_valid_value("text-decoration-line", "line-through");
+test_valid_value("text-decoration-line", "blink");
+test_valid_value("text-decoration-line", "underline overline");
+test_valid_value("text-decoration-line", "overline underline", "underline overline");
+test_valid_value("text-decoration-line", "underline line-through");
+test_valid_value("text-decoration-line", "line-through underline", "underline line-through");
+test_valid_value("text-decoration-line", "underline blink");
+test_valid_value("text-decoration-line", "blink underline", "underline blink");
+test_valid_value("text-decoration-line", "overline line-through");
+test_valid_value("text-decoration-line", "line-through overline", "overline line-through");
+test_valid_value("text-decoration-line", "overline blink");
+test_valid_value("text-decoration-line", "blink overline", "overline blink");
+test_valid_value("text-decoration-line", "line-through blink");
+test_valid_value("text-decoration-line", "blink line-through", "line-through blink");
+test_valid_value("text-decoration-line", "underline overline line-through");
+test_valid_value("text-decoration-line", "underline line-through overline", "underline overline line-through");
+test_valid_value("text-decoration-line", "overline underline line-through", "underline overline line-through");
+test_valid_value("text-decoration-line", "overline line-through underline", "underline overline line-through");
+test_valid_value("text-decoration-line", "line-through underline overline", "underline overline line-through");
+test_valid_value("text-decoration-line", "line-through overline underline", "underline overline line-through");
+test_valid_value("text-decoration-line", "underline overline blink");
+test_valid_value("text-decoration-line", "underline blink overline", "underline overline blink");
+test_valid_value("text-decoration-line", "overline underline blink", "underline overline blink");
+test_valid_value("text-decoration-line", "overline blink underline", "underline overline blink");
+test_valid_value("text-decoration-line", "blink underline overline", "underline overline blink");
+test_valid_value("text-decoration-line", "blink overline underline", "underline overline blink");
+test_valid_value("text-decoration-line", "underline line-through blink");
+test_valid_value("text-decoration-line", "underline blink line-through", "underline line-through blink");
+test_valid_value("text-decoration-line", "line-through underline blink", "underline line-through blink");
+test_valid_value("text-decoration-line", "line-through blink underline", "underline line-through blink");
+test_valid_value("text-decoration-line", "blink underline line-through", "underline line-through blink");
+test_valid_value("text-decoration-line", "blink line-through underline", "underline line-through blink");
+test_valid_value("text-decoration-line", "overline line-through blink");
+test_valid_value("text-decoration-line", "overline blink line-through", "overline line-through blink");
+test_valid_value("text-decoration-line", "line-through overline blink", "overline line-through blink");
+test_valid_value("text-decoration-line", "line-through blink overline", "overline line-through blink");
+test_valid_value("text-decoration-line", "blink overline line-through", "overline line-through blink");
+test_valid_value("text-decoration-line", "blink line-through overline", "overline line-through blink");
+test_valid_value("text-decoration-line", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "underline overline blink line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "underline line-through overline blink", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "underline line-through blink overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "underline blink overline line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "underline blink line-through overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline underline line-through blink", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline underline blink line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline line-through underline blink", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline line-through blink underline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline blink underline line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "overline blink line-through underline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through underline overline blink", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through underline blink overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through overline underline blink", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through overline blink underline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through blink underline overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "line-through blink overline underline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink underline overline line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink underline line-through overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink overline underline line-through", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink overline line-through underline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink line-through underline overline", "underline overline line-through blink");
+test_valid_value("text-decoration-line", "blink line-through overline underline", "underline overline line-through blink");
+
+// spelling-error
+test_valid_value("text-decoration-line", "spelling-error");
+
+// grammar-error
+test_valid_value("text-decoration-line", "grammar-error");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/custom-elements/upgrading/Node-cloneNode.html b/tests/wpt/web-platform-tests/custom-elements/upgrading/Node-cloneNode.html
index 1a8786e914b..364cecd76de 100644
--- a/tests/wpt/web-platform-tests/custom-elements/upgrading/Node-cloneNode.html
+++ b/tests/wpt/web-platform-tests/custom-elements/upgrading/Node-cloneNode.html
@@ -165,8 +165,8 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     instance.cloneNode(false);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
-}, 'HTMLElement constructor must throw an InvalidStateError when the top of the construction stack is marked AlreadyConstructed'
+    assert_equals(uncaughtError.name, 'TypeError');
+}, 'HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed'
     + ' due to a custom element constructor constructing itself after super() call');
 
 test(function () {
@@ -183,8 +183,8 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     instance.cloneNode(false);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
-}, 'HTMLElement constructor must throw an InvalidStateError when the top of the construction stack is marked AlreadyConstructed'
+    assert_equals(uncaughtError.name, 'TypeError');
+}, 'HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed'
     + ' due to a custom element constructor constructing itself before super() call');
 
 test(function () {
@@ -203,8 +203,8 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     instance.cloneNode(false);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
-}, 'Upgrading a custom element must throw InvalidStateError when the custom element\'s constructor returns another element');
+    assert_equals(uncaughtError.name, 'TypeError');
+}, 'Upgrading a custom element must throw TypeError when the custom element\'s constructor returns another element');
 
 test(function () {
     var instance = document.createElement('my-custom-element-throw-exception');
diff --git a/tests/wpt/web-platform-tests/custom-elements/upgrading/upgrading-parser-created-element.html b/tests/wpt/web-platform-tests/custom-elements/upgrading/upgrading-parser-created-element.html
index 7cc3b18aeef..0f7f95786dd 100644
--- a/tests/wpt/web-platform-tests/custom-elements/upgrading/upgrading-parser-created-element.html
+++ b/tests/wpt/web-platform-tests/custom-elements/upgrading/upgrading-parser-created-element.html
@@ -15,6 +15,8 @@
 <instantiates-itself-before-super></instantiates-itself-before-super>
 <my-other-element id="instance"></my-other-element>
 <my-other-element id="otherInstance"></my-other-element>
+<not-an-element></not-an-element>
+<not-an-html-element></not-an-html-element>
 <script>
 
 setup({allow_uncaught_exception:true});
@@ -48,8 +50,8 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     customElements.define('instantiates-itself-after-super', InstantiatesItselfAfterSuper);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
-}, 'HTMLElement constructor must throw an InvalidStateError when the top of the construction stack is marked AlreadyConstructed'
+    assert_equals(uncaughtError.name, 'TypeError');
+}, 'HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed'
     + ' due to a custom element constructor constructing itself after super() call');
 
 test(function () {
@@ -64,8 +66,8 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     customElements.define('instantiates-itself-before-super', InstantiatesItselfBeforeSuper);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
-}, 'HTMLElement constructor must throw an InvalidStateError when the top of the construction stack is marked AlreadyConstructed'
+    assert_equals(uncaughtError.name, 'TypeError');
+}, 'HTMLElement constructor must throw an TypeError when the top of the construction stack is marked AlreadyConstructed'
     + ' due to a custom element constructor constructing itself before super() call');
 
 test(function () {
@@ -85,12 +87,38 @@ test(function () {
     var uncaughtError;
     window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
     customElements.define('my-other-element', MyOtherElement);
-    assert_equals(uncaughtError.name, 'InvalidStateError');
+    assert_equals(uncaughtError.name, 'TypeError');
 
     assert_true(document.createElement('my-other-element') instanceof MyOtherElement,
         'Upgrading of custom elements must happen after the definition was added to the registry.');
 
-}, 'Upgrading a custom element must throw an InvalidStateError when the returned element is not SameValue as the upgraded element');
+}, 'Upgrading a custom element must throw an TypeError when the returned element is not SameValue as the upgraded element');
+
+test(() => {
+  class NotAnElement extends HTMLElement {
+    constructor() {
+      return new Text();
+    }
+  }
+
+  let uncaughtError;
+  window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
+  customElements.define("not-an-element", NotAnElement);
+  assert_equals(uncaughtError.name, "TypeError");
+}, "Upgrading a custom element whose constructor returns a Text node must throw");
+
+test(() => {
+  class NotAnHTMLElement extends HTMLElement {
+    constructor() {
+      return document.createElementNS("", "test");
+    }
+  }
+
+  let uncaughtError;
+  window.onerror = function (message, url, lineNumber, columnNumber, error) { uncaughtError = error; return true; }
+  customElements.define("not-an-html-element", NotAnHTMLElement);
+  assert_equals(uncaughtError.name, "TypeError");
+}, "Upgrading a custom element whose constructor returns an Element must throw");
 
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html
new file mode 100644
index 00000000000..2a6faefcd3b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/feature-policy/experimental-features/resources/common.js"></script>
+<style>
+html, body {
+  height: 100%;
+  width: 100%;
+}
+
+iframe {
+  width: 400px;
+  height: 400px;
+  margin: 10px;
+}
+
+.spacer {
+  width: 100%;
+  height: 10000px;
+}
+</style>
+<div class="spacer"></div>
+<script>
+  let load_timeout = 600; // ms
+  let expected_timeout_msg = false;
+
+  let cross_origin_url =
+      "http://{{hosts[alt][www]}}:{{ports[http][0]}}/" +
+      "feature-policy/experimental-features/resources/lazyload-contents.html";
+
+  window.scrollTo(0, 0);
+
+  // Verify that when 'loading-frame-default-eager' policy is disabled, the
+  // loading attribute "auto" leads to lazy loading.
+  promise_test(async(t) => {
+    // Add a frame with load="off".
+    let frame_loading_auto = createIframe(document.body, {
+        id: "auto",
+        // Sets the "loading" attribute to "auto".
+        loading: "auto",
+        src: `${cross_origin_url}?id=auto`
+      });
+    // Sanity-check: The frame is not visible.
+    assert_greater_than(
+        frame_loading_auto.getBoundingClientRect().top,
+        window.innerHeight * 2,
+        "Unexpected position for <iframe> with ID 'auto'.");
+    let msg_or_timeout =
+        await waitForMessageOrTimeout(t, "auto", load_timeout);
+    assert_false(msg_or_timeout, "Expected the frame not to load.");
+  }, "When 'loading-frame-default-eager' feature is disabled, a frame with " +
+     "'loading attribute 'auto' will be lazily loaded.");
+</script>
diff --git a/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html.headers b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html.headers
new file mode 100644
index 00000000000..8cba4d2df9c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/feature-policy/experimental-features/lazyload/loading-frame-default-eager-disabled-tentative.sub.html.headers
@@ -0,0 +1 @@
+Feature-Policy: loading-frame-default-eager 'none'
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/prefetch.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/prefetch.tentative.https.sub.html
new file mode 100644
index 00000000000..2c230b89496
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/prefetch.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/sec-metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body></body>
+<script>
+  test(t => {
+    assert_true(document.createElement('link').relList.supports('prefetch'));
+  }, "Browser supports prefetch.");
+
+  function create_test(host, expected) {
+    async_test(t => {
+      let nonce = token();
+      let key = "prefetch" + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "prefetch";
+      e.href = `https://${host}/fetch/sec-metadata/resources/record-header.py?file=${key}`;
+      e.setAttribute("crossorigin", "crossorigin");
+      e.onload = t.step_func(e => {
+        fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
+          .then(t.step_func(response => response.text()))
+          .then(t.step_func_done(text => assert_header_equals(text, expected)))
+          .catch(t.unreached_func("Fetching and verifying the results should succeed."));
+      });
+      e.onerror = t.unreached_func();
+
+      document.head.appendChild(e);
+    }, `<link rel='prefetch' href='https://${host}/...'>`);
+  }
+
+  create_test("{{host}}:{{ports[https][0]}}", {"dest":"empty", "site":"same-origin", "user":"", "mode": "cors"});
+  create_test("{{hosts[][www]}}:{{ports[https][0]}}", {"dest":"empty", "site":"same-site", "user":"", "mode": "cors"});
+  create_test("{{hosts[alt][www]}}:{{ports[https][0]}}", {"dest":"empty", "site":"cross-site", "user":"", "mode": "cors"});
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/preload.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/preload.tentative.https.sub.html
new file mode 100644
index 00000000000..2fdf65d5920
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/preload.tentative.https.sub.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/sec-metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body></body>
+<script>
+  test(t => {
+    assert_true(document.createElement('link').relList.supports('preload'));
+  }, "Browser supports preload.");
+
+  function create_test(host, as, expected) {
+    async_test(t => {
+      let nonce = token();
+      let key = as + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "preload";
+      e.href = `https://${host}/fetch/sec-metadata/resources/record-header.py?file=${key}`;
+      e.setAttribute("crossorigin", "crossorigin");
+      if (as !== undefined) {
+        e.setAttribute("as", as);
+      }
+      e.onload = e.onerror = t.step_func_done(e => {
+        fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
+          .then(t.step_func(response => response.text()))
+          .then(t.step_func(text => assert_header_equals(text, expected)))
+          .then(t.step_func_done(_ => resolve()))
+          .catch(t.unreached_func());
+      });
+
+      document.head.appendChild(e);
+    }, `<link rel='preload' as='${as}' href='https://${host}/...'>`);
+  }
+
+  let as_tests = [
+    [ "fetch", "empty" ],
+    [ "font", "font" ],
+    [ "image", "image" ],
+    [ "script", "script" ],
+    [ "style", "style" ],
+    [ "track", "track" ],
+  ];
+
+  as_tests.forEach(item => {
+    create_test("{{host}}:{{ports[https][0]}}", item[0], {"dest":item[1], "site":"same-origin", "user":"", "mode": "cors"});
+    create_test("{{hosts[][www]}}:{{ports[https][0]}}", item[0], {"dest":item[1], "site":"same-site", "user":"", "mode": "cors"});
+    create_test("{{hosts[alt][www]}}:{{ports[https][0]}}", item[0], {"dest":item[1], "site":"cross-site", "user":"", "mode": "cors"});
+  });
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/record-header.py b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/record-header.py
index f215b016507..683c0a6a0c4 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/record-header.py
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/record-header.py
@@ -54,6 +54,14 @@ def main(request, response):
     if key.startswith("serviceworker"):
       response.headers.set("Content-Type", "application/javascript")
 
+    ## Add a valid image Content-Type ##
+    if key.startswith("image"):
+      response.headers.set("Content-Type", "image/png")
+      file = open(os.path.join(request.doc_root, "media", "1x1-green.png"), "r")
+      image = file.read()
+      file.close()
+      return image
+
     ## Return a valid .vtt content for the <track> tag ##
     if key.startswith("track"):
       return "WEBVTT"
diff --git a/tests/wpt/web-platform-tests/html/dom/elements/global-attributes/dataset-binding.window.js b/tests/wpt/web-platform-tests/html/dom/elements/global-attributes/dataset-binding.window.js
new file mode 100644
index 00000000000..e0e85677d1d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/dom/elements/global-attributes/dataset-binding.window.js
@@ -0,0 +1,45 @@
+[9, "x"].forEach(function(key) {
+  test(function() {
+    var element = document.createElement("div");
+    var dataset = element.dataset;
+
+    var value = "value for " + this.name;
+
+    assert_equals(dataset[key], undefined);
+
+    element.setAttribute("data-" + key, value);
+    assert_equals(element.getAttribute("data-" + key), value);
+    assert_equals(dataset[key], value);
+
+    var propdesc = Object.getOwnPropertyDescriptor(dataset, key);
+    assert_not_equals(propdesc, undefined);
+    assert_equals(propdesc.value, value);
+    assert_true(propdesc.writable);
+    assert_true(propdesc.enumerable);
+    assert_true(propdesc.configurable);
+  }, "Getting property descriptor for key " + key);
+
+  test(function() {
+    var element = document.createElement("div");
+    var dataset = element.dataset;
+
+    var proto = "proto getter for " + this.name;
+    var calledSetter = [];
+    Object.defineProperty(DOMStringMap.prototype, key, {
+      "get": function() { return proto; },
+      "set": this.unreached_func("Should not call [[Set]] on prototype"),
+      "configurable": true,
+    });
+    this.add_cleanup(function() {
+      delete DOMStringMap.prototype[key];
+    });
+
+    var value = "value for " + this.name;
+
+    assert_equals(dataset[key], proto);
+    assert_equals(element.getAttribute("data-" + key), null);
+    assert_equals(dataset[key] = value, value);
+    assert_equals(dataset[key], value);
+    assert_equals(element.getAttribute("data-" + key), value);
+  }, "Setting property for key " + key + " with accessor property on prototype");
+});
diff --git a/tests/wpt/web-platform-tests/interfaces/FileAPI.idl b/tests/wpt/web-platform-tests/interfaces/FileAPI.idl
index 15b2e5582fe..b5b40296429 100644
--- a/tests/wpt/web-platform-tests/interfaces/FileAPI.idl
+++ b/tests/wpt/web-platform-tests/interfaces/FileAPI.idl
@@ -15,6 +15,11 @@ interface Blob {
   Blob slice(optional [Clamp] long long start,
             optional [Clamp] long long end,
             optional DOMString contentType);
+
+  // read from the Blob.
+  [NewObject] ReadableStream stream();
+  [NewObject] Promise<USVString> text();
+  [NewObject] Promise<ArrayBuffer> arrayBuffer();
 };
 
 enum EndingType { "transparent", "native" };
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerlock/pointerevent_coordinates_when_locked.html b/tests/wpt/web-platform-tests/pointerevents/pointerlock/pointerevent_coordinates_when_locked.html
index 2556e83da10..9dfd5e1764d 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerlock/pointerevent_coordinates_when_locked.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerlock/pointerevent_coordinates_when_locked.html
@@ -73,15 +73,15 @@
                 });
 
                 var actions = new test_driver.Actions();
-                actions.pointerMove(/* x = */ 0, /* y = */ 0, {origin: target}).pointerDown();
+                actions.pointerMove(/* x = */ 0, /* y = */ 0, {origin: div1}).pointerDown();
 
-                pos_x = target.getBoundingClientRect().x + target.offsetWidth / 2;
-                pos_y = target.getBoundingClientRect().y + target.offsetHeight / 2;
+                pos_x = div1.offsetWidth / 2;
+                pos_y = div1.offsetHeight / 2;
                 for (var i = 0; i < 10; i++) {
                     // Alternatively move left/right and up/down.
                     pos_x += ((-1)**i) * i * 10;
                     pos_y -= ((-1)**i) * i * 10;
-                    actions.pointerMove(pos_x, pos_y);
+                    actions.pointerMove(pos_x, pos_y, {origin: div1});
                 }
                 actions.pointerUp().send();
             }
diff --git a/tests/wpt/web-platform-tests/portals/portal-activate-event-constructor.html b/tests/wpt/web-platform-tests/portals/portal-activate-event-constructor.html
new file mode 100644
index 00000000000..7263b121151
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portal-activate-event-constructor.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(() => {
+  // Even though UA-generated portalactivate events are different, the
+  // properties supplied should be used.
+  const e = new PortalActivateEvent("eventtype", { bubbles: true, cancelable: true });
+  assert_equals(e.type, "eventtype");
+  assert_true(e.bubbles);
+  assert_true(e.cancelable);
+  assert_equals(null, e.data);
+}, "It should be possible to construct a PortalActivateEvent with a dictionary");
+
+test(() => {
+  const data = {};
+  const e = new PortalActivateEvent("portalactivate", { data });
+  assert_equals(data, e.data);
+}, "A PortalActivateEvent should expose exactly the data object supplied in the original realm");
+
+test(() => {
+  const e = new PortalActivateEvent("portalactivate");
+  assert_throws("InvalidStateError", () => e.adoptPredecessor());
+}, "Invoking adoptPredecessor on a synthetic PortalActivateEvent should throw");
+</script>
diff --git a/tests/wpt/web-platform-tests/tools/manifest/download.py b/tests/wpt/web-platform-tests/tools/manifest/download.py
index e8f27e7ac10..91ae664336e 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/download.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/download.py
@@ -15,7 +15,7 @@ try:
 except ImportError:
     zstandard = None
 
-from .vcs import Git
+from .utils import git
 
 from . import log
 
@@ -40,9 +40,9 @@ def should_download(manifest_path, rebuild_time=timedelta(days=5)):
 
 
 def merge_pr_tags(repo_root, max_count=50):
-    git = Git.get_func(repo_root)
+    gitfunc = git(repo_root)
     tags = []
-    for line in git("log", "--format=%D", "--max-count=%s" % max_count).split("\n"):
+    for line in gitfunc("log", "--format=%D", "--max-count=%s" % max_count).split("\n"):
         for ref in line.split(", "):
             if ref.startswith("tag: merge_pr_"):
                 tags.append(ref[5:])
diff --git a/tests/wpt/web-platform-tests/tools/manifest/manifest.py b/tests/wpt/web-platform-tests/tools/manifest/manifest.py
index bfe57c7823b..8634b708986 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/manifest.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/manifest.py
@@ -470,7 +470,7 @@ def load_and_update(tests_root,
                     rebuild=False,
                     metadata_path=None,
                     cache_root=None,
-                    working_copy=False,
+                    working_copy=True,
                     types=None,
                     meta_filters=None,
                     write_manifest=True,
diff --git a/tests/wpt/web-platform-tests/tools/manifest/tests/test_vcs.py b/tests/wpt/web-platform-tests/tools/manifest/tests/test_utils.py
similarity index 74%
rename from tests/wpt/web-platform-tests/tools/manifest/tests/test_vcs.py
rename to tests/wpt/web-platform-tests/tools/manifest/tests/test_utils.py
index 8124b9ac380..1bdffb9b1fe 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/tests/test_vcs.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/tests/test_utils.py
@@ -3,7 +3,7 @@ import subprocess
 
 import mock
 
-from .. import vcs
+from .. import utils
 
 
 def test_git_for_path_no_git():
@@ -11,4 +11,4 @@ def test_git_for_path_no_git():
     with mock.patch(
             "subprocess.check_output",
             side_effect=subprocess.CalledProcessError(1, "foo")):
-        assert vcs.Git.for_path(this_dir, "/", this_dir) is None
+        assert utils.git(this_dir) is None
diff --git a/tests/wpt/web-platform-tests/tools/manifest/update.py b/tests/wpt/web-platform-tests/tools/manifest/update.py
index 321cfebe2a6..f1a70930bb3 100755
--- a/tests/wpt/web-platform-tests/tools/manifest/update.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/update.py
@@ -17,7 +17,7 @@ logger = get_logger()
 def update(tests_root,
            manifest,
            manifest_path=None,
-           working_copy=False,
+           working_copy=True,
            cache_root=None,
            rebuild=False):
     logger.warning("Deprecated; use manifest.load_and_update instead")
@@ -41,8 +41,7 @@ def update_from_cli(**kwargs):
                              kwargs["url_base"],
                              update=True,
                              rebuild=kwargs["rebuild"],
-                             cache_root=kwargs["cache_root"],
-                             working_copy=kwargs["work"])
+                             cache_root=kwargs["cache_root"])
 
 
 def abs_path(path):
@@ -58,9 +57,6 @@ def create_parser():
     parser.add_argument(
         "-r", "--rebuild", action="store_true", default=False,
         help="Force a full rebuild of the manifest.")
-    parser.add_argument(
-        "--work", action="store_true", default=False,
-        help="Build from the working tree rather than the latest commit")
     parser.add_argument(
         "--url-base", action="store", default="/",
         help="Base url to use as the mount point for tests in this manifest.")
diff --git a/tests/wpt/web-platform-tests/tools/manifest/utils.py b/tests/wpt/web-platform-tests/tools/manifest/utils.py
index a097ad5090e..c3456d96604 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/utils.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/utils.py
@@ -1,5 +1,6 @@
-import platform
 import os
+import platform
+import subprocess
 
 from six import BytesIO
 
@@ -32,6 +33,27 @@ def to_os_path(path):
     return path.replace("/", os.path.sep)
 
 
+def git(path):
+    def gitfunc(cmd, *args):
+        full_cmd = ["git", cmd] + list(args)
+        try:
+            return subprocess.check_output(full_cmd, cwd=path, stderr=subprocess.STDOUT)
+        except Exception as e:
+            if platform.uname()[0] == "Windows" and isinstance(e, WindowsError):
+                full_cmd[0] = "git.bat"
+                return subprocess.check_output(full_cmd, cwd=path, stderr=subprocess.STDOUT)
+            else:
+                raise
+
+    try:
+        # this needs to be a command that fails if we aren't in a git repo
+        gitfunc("rev-parse", "--show-toplevel")
+    except (subprocess.CalledProcessError, OSError):
+        return None
+    else:
+        return gitfunc
+
+
 class ContextManagerBytesIO(BytesIO):
     def __enter__(self):
         return self
diff --git a/tests/wpt/web-platform-tests/tools/manifest/vcs.py b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
index cfb0ff27c36..b63df4d0a8a 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/vcs.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
@@ -1,13 +1,10 @@
 import json
 import os
-import platform
 import stat
-import subprocess
 from collections import deque
 
-from six import iteritems
-
 from .sourcefile import SourceFile
+from .utils import git
 
 MYPY = False
 if MYPY:
@@ -16,7 +13,7 @@ if MYPY:
 
 
 def get_tree(tests_root, manifest, manifest_path, cache_root,
-             working_copy=False, rebuild=False):
+             working_copy=True, rebuild=False):
     tree = None
     if cache_root is None:
         cache_root = os.path.join(tests_root, ".wptcache")
@@ -27,11 +24,8 @@ def get_tree(tests_root, manifest, manifest_path, cache_root,
             cache_root = None
 
     if not working_copy:
-        tree = Git.for_path(tests_root,
-                            manifest.url_base,
-                            manifest_path=manifest_path,
-                            cache_path=cache_root,
-                            rebuild=rebuild)
+        raise ValueError("working_copy=False unsupported")
+
     if tree is None:
         tree = FileSystem(tests_root,
                           manifest.url_base,
@@ -41,39 +35,9 @@ def get_tree(tests_root, manifest, manifest_path, cache_root,
     return tree
 
 
-class Git(object):
-    def __init__(self, repo_root, url_base, cache_path, manifest_path=None,
-                 rebuild=False):
-        self.root = repo_root
-        self.git = Git.get_func(repo_root)
-        self.url_base = url_base
-        # rebuild is a noop for now since we don't cache anything
-
-    @staticmethod
-    def get_func(repo_path):
-        def git(cmd, *args):
-            full_cmd = ["git", cmd] + list(args)
-            try:
-                return subprocess.check_output(full_cmd, cwd=repo_path, stderr=subprocess.STDOUT)
-            except Exception as e:
-                if platform.uname()[0] == "Windows" and isinstance(e, WindowsError):
-                    full_cmd[0] = "git.bat"
-                    return subprocess.check_output(full_cmd, cwd=repo_path, stderr=subprocess.STDOUT)
-                else:
-                    raise
-        return git
-
-    @classmethod
-    def for_path(cls, path, url_base, cache_path, manifest_path=None, rebuild=False):
-        git = Git.get_func(path)
-        try:
-            # this needs to be a command that fails if we aren't in a git repo
-            git("rev-parse", "--show-toplevel")
-        except (subprocess.CalledProcessError, OSError):
-            return None
-        else:
-            return cls(path, url_base, cache_path,
-                       manifest_path=manifest_path, rebuild=rebuild)
+class GitHasher(object):
+    def __init__(self, path):
+        self.git = git(path)
 
     def _local_changes(self):
         """get a set of files which have changed between HEAD and working copy"""
@@ -95,10 +59,6 @@ class Git(object):
 
         return changes
 
-    def _show_file(self, path):
-        path = os.path.relpath(os.path.abspath(path), self.root)
-        return self.git("show", "HEAD:%s" % path)
-
     def hash_cache(self):
         # type: () -> Dict[str, Optional[str]]
         """
@@ -114,20 +74,6 @@ class Git(object):
 
         return hash_cache
 
-    def __iter__(self):
-        for rel_path, hash in iteritems(self.hash_cache()):
-            if hash is None:
-                contents = self._show_file(rel_path)
-            else:
-                contents = None
-            yield SourceFile(self.root,
-                             rel_path,
-                             self.url_base,
-                             hash,
-                             contents=contents), True
-
-    def dump_caches(self):
-        pass
 
 
 class FileSystem(object):
@@ -145,7 +91,7 @@ class FileSystem(object):
         self.path_filter = gitignore.PathFilter(self.root,
                                                 extras=[".git/"],
                                                 cache=self.ignore_cache)
-        git = Git.for_path(root, url_base, cache_path)
+        git = GitHasher(root)
         if git is not None:
             self.hash_cache = git.hash_cache()
         else:
diff --git a/tests/wpt/web-platform-tests/webaudio/resources/audit.js b/tests/wpt/web-platform-tests/webaudio/resources/audit.js
index b7ca0201610..f3ce71911ac 100644
--- a/tests/wpt/web-platform-tests/webaudio/resources/audit.js
+++ b/tests/wpt/web-platform-tests/webaudio/resources/audit.js
@@ -1210,6 +1210,18 @@ window.Audit = (function() {
       this._taskRunner._runNextTask();
     }
 
+    // Runs |subTask| |time| milliseconds later. |setTimeout| is not allowed in
+    // WPT linter, so a thin wrapper around the harness's |step_timeout| is
+    // used here.
+    timeout(subTask, time) {
+      async_test((test) => {
+        test.step_timeout(() => {
+          subTask();
+          test.done();
+        }, time);
+      });
+    }
+
     isPassed() {
       return this._state === TaskState.FINISHED && this._result;
     }
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html
new file mode 100644
index 00000000000..d5bcbfe990c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-suspend.https.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test if activation of worklet thread does not resume context rendering.
+    </title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      const audit = Audit.createTaskRunner();
+      const context = new AudioContext();
+      const filePath = 'processors/dummy-processor.js';
+
+      // Suspends the context right away and then activate worklet. The current
+      // time must not advance since the context is suspended.
+      audit.define(
+          {label: 'load-worklet-and-suspend'},
+          async (task, should) => {
+            context.suspend();
+            const suspendTime = context.currentTime;
+            await context.audioWorklet.addModule(filePath);
+            const dummy = new AudioWorkletNode(context, 'dummy');
+            dummy.connect(context.destination);
+            task.timeout(() => {
+              should(context.currentTime, 'context.currentTime')
+                  .beEqualTo(suspendTime);
+              should(context.state, 'context.state').beEqualTo('suspended');
+              task.done();
+            }, 1000);
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webstorage/set.window.js b/tests/wpt/web-platform-tests/webstorage/set.window.js
index 479ad588910..228ce602966 100644
--- a/tests/wpt/web-platform-tests/webstorage/set.window.js
+++ b/tests/wpt/web-platform-tests/webstorage/set.window.js
@@ -1,7 +1,8 @@
 ["localStorage", "sessionStorage"].forEach(function(name) {
     [9, "x"].forEach(function(key) {
         test(function() {
-            var value = "value";
+            var expected = "value for " + this.name;
+            var value = expected;
 
             var storage = window[name];
             storage.clear();
@@ -9,13 +10,14 @@
             assert_equals(storage[key], undefined);
             assert_equals(storage.getItem(key), null);
             assert_equals(storage[key] = value, value);
-            assert_equals(storage[key], "value");
-            assert_equals(storage.getItem(key), "value");
+            assert_equals(storage[key], expected);
+            assert_equals(storage.getItem(key), expected);
         }, "Setting property for key " + key + " on " + name);
 
         test(function() {
+            var expected = "value for " + this.name;
             var value = {
-                toString: function() { return "value"; }
+                toString: function() { return expected; }
             };
 
             var storage = window[name];
@@ -24,79 +26,77 @@
             assert_equals(storage[key], undefined);
             assert_equals(storage.getItem(key), null);
             assert_equals(storage[key] = value, value);
-            assert_equals(storage[key], "value");
-            assert_equals(storage.getItem(key), "value");
+            assert_equals(storage[key], expected);
+            assert_equals(storage.getItem(key), expected);
         }, "Setting property with toString for key " + key + " on " + name);
 
         test(function() {
-            Storage.prototype[key] = "proto";
+            var proto = "proto for " + this.name;
+            Storage.prototype[key] = proto;
             this.add_cleanup(function() { delete Storage.prototype[key]; });
 
-            var value = "value";
+            var value = "value for " + this.name;
 
             var storage = window[name];
             storage.clear();
 
-            assert_equals(storage[key], "proto");
+            assert_equals(storage[key], proto);
             assert_equals(storage.getItem(key), null);
             assert_equals(storage[key] = value, value);
             // Hidden because no [OverrideBuiltins].
-            assert_equals(storage[key], "proto");
+            assert_equals(storage[key], proto);
             assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
-            assert_equals(storage.getItem(key), "value");
+            assert_equals(storage.getItem(key), value);
         }, "Setting property for key " + key + " on " + name + " with data property on prototype");
 
         test(function() {
-            Storage.prototype[key] = "proto";
+            var proto = "proto for " + this.name;
+            Storage.prototype[key] = proto;
             this.add_cleanup(function() { delete Storage.prototype[key]; });
 
-            var value = "value";
+            var value = "value for " + this.name;
+            var existing = "existing for " + this.name;
 
             var storage = window[name];
             storage.clear();
 
-            storage.setItem(key, "existing");
+            storage.setItem(key, existing);
 
             // Hidden because no [OverrideBuiltins].
-            assert_equals(storage[key], "proto");
+            assert_equals(storage[key], proto);
             assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
-            assert_equals(storage.getItem(key), "existing");
+            assert_equals(storage.getItem(key), existing);
             assert_equals(storage[key] = value, value);
-            assert_equals(storage[key], "proto");
+            assert_equals(storage[key], proto);
             assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
-            assert_equals(storage.getItem(key), "value");
+            assert_equals(storage.getItem(key), value);
         }, "Setting property for key " + key + " on " + name + " with data property on prototype and existing item");
 
         test(function() {
-            var calledSetter = [];
-            Object.defineProperty(Storage.prototype, key, {
-                "get": function() { return "proto getter"; },
-                "set": function(v) { calledSetter.push(v); },
-                configurable: true,
-            });
-            this.add_cleanup(function() { delete Storage.prototype[key]; });
-
-            var value = "value";
-
             var storage = window[name];
             storage.clear();
 
-            assert_equals(storage[key], "proto getter");
+            var proto = "proto getter for " + this.name;
+            Object.defineProperty(Storage.prototype, key, {
+                "get": function() { return proto; },
+                "set": this.unreached_func("Should not call [[Set]] on prototype"),
+                "configurable": true,
+            });
+            this.add_cleanup(function() {
+                delete Storage.prototype[key];
+                delete storage[key];
+                assert_false(key in storage);
+            });
+
+            var value = "value for " + this.name;
+
+            assert_equals(storage[key], proto);
             assert_equals(storage.getItem(key), null);
             assert_equals(storage[key] = value, value);
             // Property is hidden because no [OverrideBuiltins].
-            if (typeof key === "number") {
-                // P is an array index: call through to OrdinarySetWithOwnDescriptor()
-                assert_array_equals(calledSetter, [value]);
-                assert_equals(storage[key], "proto getter");
-                assert_equals(storage.getItem(key), null);
-            } else {
-                // P is not an array index: early return in [[Set]] step 2.
-                // https://github.com/heycam/webidl/issues/630
-                assert_equals(storage[key], "proto getter");
-                assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
-                assert_equals(storage.getItem(key), "value");
-            }
+            assert_equals(storage[key], proto);
+            assert_equals(Object.getOwnPropertyDescriptor(storage, key), undefined);
+            assert_equals(storage.getItem(key), value);
         }, "Setting property for key " + key + " on " + name + " with accessor property on prototype");
     });
 });
diff --git a/tests/wpt/web-platform-tests/webxr/xrSession_transfer_outputContext.https.html b/tests/wpt/web-platform-tests/webxr/xrSession_transfer_outputContext.https.html
index 69c52d2bfb4..658cb322487 100644
--- a/tests/wpt/web-platform-tests/webxr/xrSession_transfer_outputContext.https.html
+++ b/tests/wpt/web-platform-tests/webxr/xrSession_transfer_outputContext.https.html
@@ -3,40 +3,53 @@
   <script src=/resources/testharness.js></script>
   <script src=/resources/testharnessreport.js></script>
   <script src="resources/webxr_util.js"></script>
+  <canvas></canvas>
   <script>
     xr_promise_test(
       "Ensure that XRPresentationContexts are properly transfered between session",
       (t) => {
         return XRTest.simulateDeviceConnection({ supportsImmersive:false })
           .then( (controller) => {
-            Promise.all([
+            return Promise.all([
               navigator.xr.requestSession({ mode: 'inline'}),
               navigator.xr.requestSession({ mode: 'inline'})
             ]).then((sessions) => {
-              assert_not_equals(sessions[0], null);
-              assert_not_equals(sessions[1], null);
+              t.step(() => {
+                assert_not_equals(sessions[0], null);
+                assert_not_equals(sessions[1], null);
+              });
 
+              const webglCanvas = document.getElementsByTagName('canvas')[0];
+              let gl = webglCanvas.getContext('webgl', {xrCompatible: true});
               let outputContext = getOutputContext();
 
               sessions[0].updateRenderState({
-                baseLayer: new XRWebGLLayer(session, gl),
+                baseLayer: new XRWebGLLayer(sessions[0], gl),
                 outputContext: outputContext
               });
 
-              sessions[0].requestAnimationFrame((time, xrFrame) => {
-                sessions[1].updateRenderState({
-                  baseLayer: new XRWebGLLayer(session, gl),
-                  outputContext: outputContext
-                });
+              return new Promise((resolve, reject) => {
+                sessions[0].requestAnimationFrame((time, xrFrame) => {
+                  sessions[1].updateRenderState({
+                    baseLayer: new XRWebGLLayer(sessions[1], gl),
+                    outputContext: outputContext
+                  });
 
-                // outputContext reassignment should not happen until the next frame is processed.
-                assert_equals(sessions[0].renderState.outputContext, outputContext);
-                assert_equals(sessions[1].renderState.outputContext, null);
+                  t.step(() => {
+                    // outputContext reassignment should not happen until the next frame is processed.
+                    assert_equals(sessions[0].renderState.outputContext, outputContext);
+                    assert_equals(sessions[1].renderState.outputContext, null);
+                  });
 
-                sessions[1].requestAnimationFrame((time, xrFrame) => {
-                  // Ensure the outputContext was properly reassigned from one context to the other.
-                  assert_equals(sessions[0].renderState.outputContext, null);
-                  assert_equals(sessions[1].renderState.outputContext, outputContext);
+                  sessions[1].requestAnimationFrame((time, xrFrame) => {
+                    t.step(() => {
+                      // Ensure the outputContext was properly reassigned from one context to the other.
+                      assert_equals(sessions[0].renderState.outputContext, null);
+                      assert_equals(sessions[1].renderState.outputContext, outputContext);
+                    });
+
+                    resolve();
+                  });
                 });
               });
             });