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..3a3d15b8406 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
@@ -37,3 +37,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
+  [Revoke blob URL after calling fetch, fetch should succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index d4145ba7571..e0b075ccea4 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -108325,6 +108325,18 @@
      {}
     ]
    ],
+   "css/css-backgrounds/child-move-reveals-parent-background.html": [
+    [
+     "/css/css-backgrounds/child-move-reveals-parent-background.html",
+     [
+      [
+       "/css/css-backgrounds/child-move-reveals-parent-background-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-backgrounds/css-border-radius-001.html": [
     [
      "/css/css-backgrounds/css-border-radius-001.html",
@@ -129705,6 +129717,30 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-span-all-dynamic-add-011.html": [
+    [
+     "/css/css-multicol/multicol-span-all-dynamic-add-011.html",
+     [
+      [
+       "/css/css-multicol/multicol-span-all-dynamic-add-003-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-span-all-dynamic-add-012.html": [
+    [
+     "/css/css-multicol/multicol-span-all-dynamic-add-012.html",
+     [
+      [
+       "/css/css-multicol/multicol-span-all-dynamic-add-012-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-span-all-dynamic-remove-001.html": [
     [
      "/css/css-multicol/multicol-span-all-dynamic-remove-001.html",
@@ -253758,6 +253794,11 @@
      {}
     ]
    ],
+   "css/css-backgrounds/child-move-reveals-parent-background-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-backgrounds/justfortest.html": [
     [
      {}
@@ -267113,6 +267154,11 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-span-all-dynamic-add-012-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-span-all-dynamic-remove-001-ref.html": [
     [
      {}
@@ -301148,6 +301194,11 @@
      {}
     ]
    ],
+   "infrastructure/metadata/infrastructure/reftest/size.html.ini": [
+    [
+     {}
+    ]
+   ],
    "infrastructure/metadata/infrastructure/server/context.any.js.ini": [
     [
      {}
@@ -301158,6 +301209,11 @@
      {}
     ]
    ],
+   "infrastructure/metadata/infrastructure/server/order-of-metas.window.js.ini": [
+    [
+     {}
+    ]
+   ],
    "infrastructure/metadata/infrastructure/server/secure-context.https.any.js.ini": [
     [
      {}
@@ -301193,6 +301249,11 @@
      {}
     ]
    ],
+   "infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini": [
+    [
+     {}
+    ]
+   ],
    "infrastructure/reftest-wait-ref.html": [
     [
      {}
@@ -304588,7 +304649,37 @@
      {}
     ]
    ],
-   "portals/resources/portal-activate-event-window.html": [
+   "portals/resources/portal-cross-origin.sub.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-embed-and-activate.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-forward-with-broadcast.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-host-cross-origin-navigate.sub.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-host-cross-origin.sub.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-host-hidden-after-activation-portal.html": [
+    [
+     {}
+    ]
+   ],
+   "portals/resources/portal-host.html": [
     [
      {}
     ]
@@ -314028,6 +314119,11 @@
      {}
     ]
    ],
+   "tools/ci/azure/cleanup_win10.yml": [
+    [
+     {}
+    ]
+   ],
    "tools/ci/azure/install_certs.yml": [
     [
      {}
@@ -314048,6 +314144,11 @@
      {}
     ]
    ],
+   "tools/ci/azure/install_python.yml": [
+    [
+     {}
+    ]
+   ],
    "tools/ci/azure/install_safari.yml": [
     [
      {}
@@ -314058,6 +314159,11 @@
      {}
     ]
    ],
+   "tools/ci/azure/system_info.yml": [
+    [
+     {}
+    ]
+   ],
    "tools/ci/azure/tox_pytest.yml": [
     [
      {}
@@ -322028,107 +322134,107 @@
      {}
     ]
    ],
-   "wasm/serialization/incrementer.wasm": [
+   "wasm/serialization/module/incrementer.wasm": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/blank.html": [
+   "wasm/serialization/module/resources/blank.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/broadcastchannel-iframe.html": [
+   "wasm/serialization/module/resources/broadcastchannel-iframe.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/broadcastchannel-sharedworker.js": [
+   "wasm/serialization/module/resources/broadcastchannel-sharedworker.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/broadcastchannel-worker.js": [
+   "wasm/serialization/module/resources/broadcastchannel-worker.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/create-empty-wasm-module.js": [
+   "wasm/serialization/module/resources/create-empty-wasm-module.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/echo-iframe.html": [
+   "wasm/serialization/module/resources/echo-iframe.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/echo-worker.js": [
+   "wasm/serialization/module/resources/echo-worker.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer-iframe-domain.sub.html": [
+   "wasm/serialization/module/resources/incrementer-iframe-domain.sub.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer-iframe.html": [
+   "wasm/serialization/module/resources/incrementer-iframe.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer-popup.html": [
+   "wasm/serialization/module/resources/incrementer-popup.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer-worker-with-channel.js": [
+   "wasm/serialization/module/resources/incrementer-worker-with-channel.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer-worker.js": [
+   "wasm/serialization/module/resources/incrementer-worker.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/incrementer.wasm": [
+   "wasm/serialization/module/resources/incrementer.wasm": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/nested-iframe-1.html": [
+   "wasm/serialization/module/resources/nested-iframe-1.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/nested-iframe-2.html": [
+   "wasm/serialization/module/resources/nested-iframe-2.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/nested-iframe-3.html": [
+   "wasm/serialization/module/resources/nested-iframe-3.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/nested-iframe-4-incrementer.html": [
+   "wasm/serialization/module/resources/nested-iframe-4-incrementer.html": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/serviceworker-failure.js": [
+   "wasm/serialization/module/resources/serviceworker-failure.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/sharedworker-failure.js": [
+   "wasm/serialization/module/resources/sharedworker-failure.js": [
     [
      {}
     ]
    ],
-   "wasm/serialization/resources/test-incrementer.js": [
+   "wasm/serialization/module/resources/test-incrementer.js": [
     [
      {}
     ]
@@ -347877,6 +347983,24 @@
      {}
     ]
    ],
+   "css/css-sizing/table-percentage-max-width-beside-float.html": [
+    [
+     "/css/css-sizing/table-percentage-max-width-beside-float.html",
+     {}
+    ]
+   ],
+   "css/css-sizing/table-percentage-min-width-below-float.html": [
+    [
+     "/css/css-sizing/table-percentage-min-width-below-float.html",
+     {}
+    ]
+   ],
+   "css/css-sizing/table-percentage-min-width-beside-float.html": [
+    [
+     "/css/css-sizing/table-percentage-min-width-beside-float.html",
+     {}
+    ]
+   ],
    "css/css-syntax/anb-parsing.html": [
     [
      "/css/css-syntax/anb-parsing.html",
@@ -348051,6 +348175,12 @@
      {}
     ]
    ],
+   "css/css-syntax/urange-parsing.html": [
+    [
+     "/css/css-syntax/urange-parsing.html",
+     {}
+    ]
+   ],
    "css/css-syntax/whitespace.html": [
     [
      "/css/css-syntax/whitespace.html",
@@ -352673,6 +352803,12 @@
      {}
     ]
    ],
+   "css/css-values/calc-numbers.html": [
+    [
+     "/css/css-values/calc-numbers.html",
+     {}
+    ]
+   ],
    "css/css-values/calc-rounding-001.html": [
     [
      "/css/css-values/calc-rounding-001.html",
@@ -372091,6 +372227,18 @@
      {}
     ]
    ],
+   "html/browsers/windows/embedded-opener-a-form.html": [
+    [
+     "/html/browsers/windows/embedded-opener-a-form.html",
+     {}
+    ]
+   ],
+   "html/browsers/windows/embedded-opener.html": [
+    [
+     "/html/browsers/windows/embedded-opener.html",
+     {}
+    ]
+   ],
    "html/browsers/windows/nested-browsing-contexts/frameElement.sub.html": [
     [
      "/html/browsers/windows/nested-browsing-contexts/frameElement.sub.html",
@@ -373805,6 +373953,18 @@
      {}
     ]
    ],
+   "html/semantics/document-metadata/the-link-element/link-multiple-error-events.html": [
+    [
+     "/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html",
+     {}
+    ]
+   ],
+   "html/semantics/document-metadata/the-link-element/link-multiple-load-events.html": [
+    [
+     "/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html",
+     {}
+    ]
+   ],
    "html/semantics/document-metadata/the-link-element/link-rel-attribute.html": [
     [
      "/html/semantics/document-metadata/the-link-element/link-rel-attribute.html",
@@ -398973,6 +399133,16 @@
      {}
     ]
    ],
+   "performance-timeline/po-observe-type.any.js": [
+    [
+     "/performance-timeline/po-observe-type.any.html",
+     {}
+    ],
+    [
+     "/performance-timeline/po-observe-type.any.worker.html",
+     {}
+    ]
+   ],
    "performance-timeline/po-observe.any.js": [
     [
      "/performance-timeline/po-observe.any.html",
@@ -399387,6 +399557,30 @@
      {}
     ]
    ],
+   "portals/portals-activate-no-browsing-context.html": [
+    [
+     "/portals/portals-activate-no-browsing-context.html",
+     {}
+    ]
+   ],
+   "portals/portals-cross-origin-load.sub.html": [
+    [
+     "/portals/portals-cross-origin-load.sub.html",
+     {}
+    ]
+   ],
+   "portals/portals-host-exposure.sub.html": [
+    [
+     "/portals/portals-host-exposure.sub.html",
+     {}
+    ]
+   ],
+   "portals/portals-host-hidden-after-activation.html": [
+    [
+     "/portals/portals-host-hidden-after-activation.html",
+     {}
+    ]
+   ],
    "portals/portals-host-null.html": [
     [
      "/portals/portals-host-null.html",
@@ -417149,99 +417343,99 @@
      {}
     ]
    ],
-   "wasm/serialization/broadcastchannel-success-and-failure.html": [
+   "wasm/serialization/module/broadcastchannel-success-and-failure.html": [
     [
-     "/wasm/serialization/broadcastchannel-success-and-failure.html",
+     "/wasm/serialization/module/broadcastchannel-success-and-failure.html",
      {}
     ]
    ],
-   "wasm/serialization/broadcastchannel-success.html": [
+   "wasm/serialization/module/broadcastchannel-success.html": [
     [
-     "/wasm/serialization/broadcastchannel-success.html",
+     "/wasm/serialization/module/broadcastchannel-success.html",
      {}
     ]
    ],
-   "wasm/serialization/identity-not-preserved.html": [
+   "wasm/serialization/module/identity-not-preserved.html": [
     [
-     "/wasm/serialization/identity-not-preserved.html",
+     "/wasm/serialization/module/identity-not-preserved.html",
      {}
     ]
    ],
-   "wasm/serialization/nested-worker-success.any.js": [
+   "wasm/serialization/module/nested-worker-success.any.js": [
     [
-     "/wasm/serialization/nested-worker-success.any.sharedworker.html",
+     "/wasm/serialization/module/nested-worker-success.any.sharedworker.html",
      {}
     ],
     [
-     "/wasm/serialization/nested-worker-success.any.worker.html",
+     "/wasm/serialization/module/nested-worker-success.any.worker.html",
      {}
     ]
    ],
-   "wasm/serialization/no-transferring.html": [
+   "wasm/serialization/module/no-transferring.html": [
     [
-     "/wasm/serialization/no-transferring.html",
+     "/wasm/serialization/module/no-transferring.html",
      {}
     ]
    ],
-   "wasm/serialization/serialization-via-history.html": [
+   "wasm/serialization/module/serialization-via-history.html": [
     [
-     "/wasm/serialization/serialization-via-history.html",
+     "/wasm/serialization/module/serialization-via-history.html",
      {}
     ]
    ],
-   "wasm/serialization/serialization-via-idb.any.js": [
+   "wasm/serialization/module/serialization-via-idb.any.js": [
     [
-     "/wasm/serialization/serialization-via-idb.any.html",
+     "/wasm/serialization/module/serialization-via-idb.any.html",
      {}
     ],
     [
-     "/wasm/serialization/serialization-via-idb.any.worker.html",
+     "/wasm/serialization/module/serialization-via-idb.any.worker.html",
      {}
     ]
    ],
-   "wasm/serialization/serialization-via-notifications-api.any.js": [
+   "wasm/serialization/module/serialization-via-notifications-api.any.js": [
     [
-     "/wasm/serialization/serialization-via-notifications-api.any.html",
+     "/wasm/serialization/module/serialization-via-notifications-api.any.html",
      {}
     ],
     [
-     "/wasm/serialization/serialization-via-notifications-api.any.worker.html",
+     "/wasm/serialization/module/serialization-via-notifications-api.any.worker.html",
      {}
     ]
    ],
-   "wasm/serialization/window-domain-success.sub.html": [
+   "wasm/serialization/module/window-domain-success.sub.html": [
     [
-     "/wasm/serialization/window-domain-success.sub.html",
+     "/wasm/serialization/module/window-domain-success.sub.html",
      {}
     ]
    ],
-   "wasm/serialization/window-messagechannel-success.html": [
+   "wasm/serialization/module/window-messagechannel-success.html": [
     [
-     "/wasm/serialization/window-messagechannel-success.html",
+     "/wasm/serialization/module/window-messagechannel-success.html",
      {}
     ]
    ],
-   "wasm/serialization/window-serviceworker-failure.https.html": [
+   "wasm/serialization/module/window-serviceworker-failure.https.html": [
     [
-     "/wasm/serialization/window-serviceworker-failure.https.html",
+     "/wasm/serialization/module/window-serviceworker-failure.https.html",
      {}
     ]
    ],
-   "wasm/serialization/window-sharedworker-failure.html": [
+   "wasm/serialization/module/window-sharedworker-failure.html": [
     [
-     "/wasm/serialization/window-sharedworker-failure.html",
+     "/wasm/serialization/module/window-sharedworker-failure.html",
      {}
     ]
    ],
-   "wasm/serialization/window-similar-but-cross-origin-success.sub.html": [
+   "wasm/serialization/module/window-similar-but-cross-origin-success.sub.html": [
     [
-     "/wasm/serialization/window-similar-but-cross-origin-success.sub.html",
+     "/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html",
      {}
     ]
    ],
-   "wasm/serialization/window-simple-success.html": [
+   "wasm/serialization/module/window-simple-success.html": [
     [
-     "/wasm/serialization/window-simple-success.html",
+     "/wasm/serialization/module/window-simple-success.html",
      {}
     ]
    ],
@@ -423989,13 +424183,13 @@
      {}
     ]
    ],
-   "workers/Worker-location.any.js": [
+   "workers/Worker-location.sub.any.js": [
     [
-     "/workers/Worker-location.any.sharedworker.html",
+     "/workers/Worker-location.sub.any.sharedworker.html",
      {}
     ],
     [
-     "/workers/Worker-location.any.worker.html",
+     "/workers/Worker-location.sub.any.worker.html",
      {}
     ]
    ],
@@ -448029,7 +448223,7 @@
  },
  "paths": {
   ".azure-pipelines.yml": [
-   "41d5f560f08b106c6305649633b2c96e93aebc06",
+   "74f6a917d87e9e2f37f6d2a72c3ed4fd297ee3fc",
    "support"
   ],
   ".codecov.yml": [
@@ -455969,7 +456163,7 @@
    "testharness"
   ],
   "animation-worklet/worklet-animation-with-fill-mode.https.html": [
-   "49fead8bd39c56c6335c0748b01be0181767bbec",
+   "b910ab280ec80725eee7894e8331cf72f6c24492",
    "testharness"
   ],
   "animation-worklet/worklet-animation-with-invalid-effect.https.html": [
@@ -545672,6 +545866,14 @@
    "8a48fe357b9f4cab09d7e59e28f0560cf2235e41",
    "support"
   ],
+  "css/css-backgrounds/child-move-reveals-parent-background-ref.html": [
+   "10324966edb042c1c7298ce22dad76766c2a777b",
+   "support"
+  ],
+  "css/css-backgrounds/child-move-reveals-parent-background.html": [
+   "e369eccd07f3c7c4146b1a419d5b110ff6d0eb7c",
+   "reftest"
+  ],
   "css/css-backgrounds/color-behind-images.htm": [
    "170380aa8e12ad2685e31d507851de352b90d1f8",
    "visual"
@@ -550853,7 +551055,7 @@
    "testharness"
   ],
   "css/css-env/supports-script.tentative.html": [
-   "ec9b6d0dfe61f91d8e8869e71cd170f45c6631f3",
+   "7ab4db23a373ac5cea9e217b2dc3b15fab12fbb0",
    "testharness"
   ],
   "css/css-env/syntax.tentative.html": [
@@ -567660,6 +567862,18 @@
    "e9e96ced2aa540fe716d33cfd33a926be5ce9e91",
    "reftest"
   ],
+  "css/css-multicol/multicol-span-all-dynamic-add-011.html": [
+   "058ca6c3bab02812ede51042898e935a6a948f22",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-span-all-dynamic-add-012-ref.html": [
+   "61b45cc650720435e3c610f33f653b280e86fda3",
+   "support"
+  ],
+  "css/css-multicol/multicol-span-all-dynamic-add-012.html": [
+   "7e152af15eb37b98714138b0ae2003453ca3780b",
+   "reftest"
+  ],
   "css/css-multicol/multicol-span-all-dynamic-remove-001-ref.html": [
    "83c9fd4880f246e77a5f93dcc2755f4f2d812801",
    "support"
@@ -574156,6 +574370,18 @@
    "e11e2955891f251409e8519abd48f10fb2dd89e9",
    "reftest"
   ],
+  "css/css-sizing/table-percentage-max-width-beside-float.html": [
+   "be82ac0da66fcfb4e327580b11b491e2621b0629",
+   "testharness"
+  ],
+  "css/css-sizing/table-percentage-min-width-below-float.html": [
+   "400a87dd175c88af215f191ac48453ff101e7794",
+   "testharness"
+  ],
+  "css/css-sizing/table-percentage-min-width-beside-float.html": [
+   "d763c927016bef8ffaffa7126b944ec60563d3f7",
+   "testharness"
+  ],
   "css/css-sizing/whitespace-and-break.html": [
    "f3ea3764478488b949433daccddf710cd0a91006",
    "reftest"
@@ -574640,6 +574866,10 @@
    "db09540bb08c47f62b4255be6ba72b289987d64c",
    "testharness"
   ],
+  "css/css-syntax/urange-parsing.html": [
+   "0a69faa39c1d661e17084fe63d86c826cfa58848",
+   "testharness"
+  ],
   "css/css-syntax/whitespace.html": [
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+   "ea47a55fa9ff61cdc2f0ac3caca1e98c7b2c719d",
    "testharness"
   ],
   "streams/writable-streams/bad-strategies.any.js": [
@@ -670125,7 +670431,7 @@
    "testharness"
   ],
   "streams/writable-streams/general.any.js": [
-   "253909f27b42406f099f4539311fde0280a482fa",
+   "96670448a9da68ce54d1f3ecf8b2ba38b2673c73",
    "testharness"
   ],
   "streams/writable-streams/properties.any.js": [
@@ -674220,8 +674526,12 @@
    "618c571465963a478a308899328d5fa5851d491e",
    "support"
   ],
+  "tools/ci/azure/cleanup_win10.yml": [
+   "ba08b7eafabfb1bd03e8cbb8b421a6e85ed5960a",
+   "support"
+  ],
   "tools/ci/azure/install_certs.yml": [
-   "a13a5fb39b4e724329bed3239bcd16983661a41f",
+   "5682199b3873a279ede0345c60ce37dc280fa2a2",
    "support"
   ],
   "tools/ci/azure/install_chrome.yml": [
@@ -674236,12 +674546,20 @@
    "348eb7454e064cad55b8a2e6ce9ebdf96722e4dd",
    "support"
   ],
+  "tools/ci/azure/install_python.yml": [
+   "6585239bc8ccd9654df1880423c7611e6dbbea62",
+   "support"
+  ],
   "tools/ci/azure/install_safari.yml": [
    "3329190a13cb847a8b8e5c9ffad8dc85b601318e",
    "support"
   ],
   "tools/ci/azure/pip_install.yml": [
-   "4e486304004df5d26e348aad651569783aa7fb44",
+   "6220abcbde5dca92450dfdf1c703ee6080ceccb8",
+   "support"
+  ],
+  "tools/ci/azure/system_info.yml": [
+   "cc37b35b853c01cdd4f6075d9a14c1fffd6a4c3a",
    "support"
   ],
   "tools/ci/azure/tox_pytest.yml": [
@@ -674249,11 +674567,11 @@
    "support"
   ],
   "tools/ci/azure/update_hosts.yml": [
-   "48c04417b02d74be63c19c8544947244b2625c1a",
+   "63c7e45811297a2dd5342b3b3ab9093acab6f5cd",
    "support"
   ],
   "tools/ci/azure/update_manifest.yml": [
-   "9f2c1fc53337fdd5773e21157ca010aaab40a000",
+   "453ac2ac3c05cf873bcf66d1be990324bd20036e",
    "support"
   ],
   "tools/ci/before_install.sh": [
@@ -679029,7 +679347,7 @@
    "support"
   ],
   "tools/wpt/browser.py": [
-   "ea8cc04f7d49eb2dd4691c0d7ce012ffb1ade5be",
+   "4878663091a13f6a94142844bfede51792eb1b7e",
    "support"
   ],
   "tools/wpt/commands.json": [
@@ -682524,143 +682842,143 @@
    "8316dcfbc89bd02073e4e08db1bee7f65d37e86c",
    "support"
   ],
-  "wasm/serialization/broadcastchannel-success-and-failure.html": [
+  "wasm/serialization/module/broadcastchannel-success-and-failure.html": [
    "0d11cc595be2d16ad795be8199ed2ae7abe79974",
    "testharness"
   ],
-  "wasm/serialization/broadcastchannel-success.html": [
+  "wasm/serialization/module/broadcastchannel-success.html": [
    "cd5f8d0b56a19148dbd01b4218869f1f0c3526fd",
    "testharness"
   ],
-  "wasm/serialization/identity-not-preserved.html": [
+  "wasm/serialization/module/identity-not-preserved.html": [
    "24bb3b16d8c50600a634d62d4c48c49dfb3b120e",
    "testharness"
   ],
-  "wasm/serialization/incrementer.wasm": [
+  "wasm/serialization/module/incrementer.wasm": [
    "47afcdef2a2812acccecd0f203d30d3023593f3d",
    "support"
   ],
-  "wasm/serialization/nested-worker-success.any.js": [
+  "wasm/serialization/module/nested-worker-success.any.js": [
    "5388ebcc39b22946957250004577a1966c264a5a",
    "testharness"
   ],
-  "wasm/serialization/no-transferring.html": [
+  "wasm/serialization/module/no-transferring.html": [
    "a0bf11f01dd459b2e3abeb249f725e1e05d1532f",
    "testharness"
   ],
-  "wasm/serialization/resources/blank.html": [
+  "wasm/serialization/module/resources/blank.html": [
    "a3c3a4689a62b45b1e429f6b7a94690e556a1259",
    "support"
   ],
-  "wasm/serialization/resources/broadcastchannel-iframe.html": [
+  "wasm/serialization/module/resources/broadcastchannel-iframe.html": [
    "83e347b5cb35c92aa3cd96263a68b56af366f0e3",
    "support"
   ],
-  "wasm/serialization/resources/broadcastchannel-sharedworker.js": [
+  "wasm/serialization/module/resources/broadcastchannel-sharedworker.js": [
    "310e0e9358446acaec0f13d8e2fb4437316953c2",
    "support"
   ],
-  "wasm/serialization/resources/broadcastchannel-worker.js": [
+  "wasm/serialization/module/resources/broadcastchannel-worker.js": [
    "76a8177060498547ab1661319c20d5d5288cd96f",
    "support"
   ],
-  "wasm/serialization/resources/create-empty-wasm-module.js": [
+  "wasm/serialization/module/resources/create-empty-wasm-module.js": [
    "7326710c9e47d756bbdab1ead2303b108b8f04db",
    "support"
   ],
-  "wasm/serialization/resources/echo-iframe.html": [
+  "wasm/serialization/module/resources/echo-iframe.html": [
    "c4fd5824a1c617c21fe8b92483b388d586edf06e",
    "support"
   ],
-  "wasm/serialization/resources/echo-worker.js": [
+  "wasm/serialization/module/resources/echo-worker.js": [
    "cbbde8a73c8c2a63cc97cbe2b6cd7c6d81585b5c",
    "support"
   ],
-  "wasm/serialization/resources/incrementer-iframe-domain.sub.html": [
+  "wasm/serialization/module/resources/incrementer-iframe-domain.sub.html": [
    "d2d18de49950c2508a69545ad95a937898b04532",
    "support"
   ],
-  "wasm/serialization/resources/incrementer-iframe.html": [
+  "wasm/serialization/module/resources/incrementer-iframe.html": [
    "5c8bc0735e207a7c18f12d578276ae3c3b999da5",
    "support"
   ],
-  "wasm/serialization/resources/incrementer-popup.html": [
+  "wasm/serialization/module/resources/incrementer-popup.html": [
    "660e472b27c086068edeb7fd2bcade536c4bd5e9",
    "support"
   ],
-  "wasm/serialization/resources/incrementer-worker-with-channel.js": [
+  "wasm/serialization/module/resources/incrementer-worker-with-channel.js": [
    "0323b3e52e75e894ae40ffc68e904ffc81ded024",
    "support"
   ],
-  "wasm/serialization/resources/incrementer-worker.js": [
+  "wasm/serialization/module/resources/incrementer-worker.js": [
    "1779ceea520ccfd07da6d595d8a34be62de89428",
    "support"
   ],
-  "wasm/serialization/resources/incrementer.wasm": [
+  "wasm/serialization/module/resources/incrementer.wasm": [
    "47afcdef2a2812acccecd0f203d30d3023593f3d",
    "support"
   ],
-  "wasm/serialization/resources/nested-iframe-1.html": [
+  "wasm/serialization/module/resources/nested-iframe-1.html": [
    "fe93cc0c4b0fe5b86bf1a12de84fb3fc48ea08a5",
    "support"
   ],
-  "wasm/serialization/resources/nested-iframe-2.html": [
+  "wasm/serialization/module/resources/nested-iframe-2.html": [
    "fad52ce9de3977c077b5a22e72ee7b23837ea302",
    "support"
   ],
-  "wasm/serialization/resources/nested-iframe-3.html": [
+  "wasm/serialization/module/resources/nested-iframe-3.html": [
    "7971022b2cdc315d598761a3694838494c2884a8",
    "support"
   ],
-  "wasm/serialization/resources/nested-iframe-4-incrementer.html": [
+  "wasm/serialization/module/resources/nested-iframe-4-incrementer.html": [
    "f419f4bc36cdffafa665e333a7e7bced3d153585",
    "support"
   ],
-  "wasm/serialization/resources/serviceworker-failure.js": [
+  "wasm/serialization/module/resources/serviceworker-failure.js": [
    "39796f9d94a39d2a13ed832544ce781373a20655",
    "support"
   ],
-  "wasm/serialization/resources/sharedworker-failure.js": [
+  "wasm/serialization/module/resources/sharedworker-failure.js": [
    "854c70b9e84e6e6fb1c59f64a06a79646a122576",
    "support"
   ],
-  "wasm/serialization/resources/test-incrementer.js": [
+  "wasm/serialization/module/resources/test-incrementer.js": [
    "65cb33227a37376c1a0134275d5079d442b443a9",
    "support"
   ],
-  "wasm/serialization/serialization-via-history.html": [
+  "wasm/serialization/module/serialization-via-history.html": [
    "35dc17b6701fadf920ce251ec6c63da1c26b6570",
    "testharness"
   ],
-  "wasm/serialization/serialization-via-idb.any.js": [
+  "wasm/serialization/module/serialization-via-idb.any.js": [
    "1d861c3d3aa1072b1c90332fec7ac993d3b59552",
    "testharness"
   ],
-  "wasm/serialization/serialization-via-notifications-api.any.js": [
+  "wasm/serialization/module/serialization-via-notifications-api.any.js": [
    "84105651d3b53192f453b9f16bb85163165495cb",
    "testharness"
   ],
-  "wasm/serialization/window-domain-success.sub.html": [
-   "51d4c5cb0ea0c0c5cf69530876c2f7c19bb3830a",
+  "wasm/serialization/module/window-domain-success.sub.html": [
+   "07360d8264df01e20123697bf2e635fc66ebacfe",
    "testharness"
   ],
-  "wasm/serialization/window-messagechannel-success.html": [
+  "wasm/serialization/module/window-messagechannel-success.html": [
    "e686c8113561d94e860a774771aa69b974696716",
    "testharness"
   ],
-  "wasm/serialization/window-serviceworker-failure.https.html": [
+  "wasm/serialization/module/window-serviceworker-failure.https.html": [
    "97c5a1decdb85317930508ece8f306fb80880ca2",
    "testharness"
   ],
-  "wasm/serialization/window-sharedworker-failure.html": [
+  "wasm/serialization/module/window-sharedworker-failure.html": [
    "667e985a30b53c0ecadfd4c68f6217b87a7a5b98",
    "testharness"
   ],
-  "wasm/serialization/window-similar-but-cross-origin-success.sub.html": [
-   "070cf0a49a8f0c0ede81b6751e727b44f36c0043",
+  "wasm/serialization/module/window-similar-but-cross-origin-success.sub.html": [
+   "a615547de09634632c1115180534bea5594835e3",
    "testharness"
   ],
-  "wasm/serialization/window-simple-success.html": [
+  "wasm/serialization/module/window-simple-success.html": [
    "6f2ccf465e93a160c73df548fc58774a5040f0e6",
    "testharness"
   ],
@@ -685969,7 +686287,7 @@
    "testharness"
   ],
   "webrtc/RTCIceCandidate-constructor.html": [
-   "cad0464a3c045a000270127ce50f89798f9eca0b",
+   "344007ded2b4d4496171402896d738817cdde12e",
    "testharness"
   ],
   "webrtc/RTCIceTransport-extension-helper.js": [
@@ -686153,7 +686471,7 @@
    "testharness"
   ],
   "webrtc/RTCRtpParameters-encodings.html": [
-   "b8ae4e4c187ce0ccea70421a248c900aae844af6",
+   "23cb76919c021f43d804fa9e213b16f79c341755",
    "testharness"
   ],
   "webrtc/RTCRtpParameters-headerExtensions.html": [
@@ -690848,8 +691166,8 @@
    "73eabd55226d67b05fc3a86a9e57880b9a725e5b",
    "testharness"
   ],
-  "workers/Worker-location.any.js": [
-   "c2a4590b75a4a156cbb05eca7f69bf43a837c095",
+  "workers/Worker-location.sub.any.js": [
+   "2ef944553105767535f6e3119048091f959bfac8",
    "testharness"
   ],
   "workers/Worker-replace-global-constructor.any.js": [
diff --git a/tests/wpt/metadata/css/css-backgrounds/child-move-reveals-parent-background.html.ini b/tests/wpt/metadata/css/css-backgrounds/child-move-reveals-parent-background.html.ini
new file mode 100644
index 00000000000..96193b9a323
--- /dev/null
+++ b/tests/wpt/metadata/css/css-backgrounds/child-move-reveals-parent-background.html.ini
@@ -0,0 +1,2 @@
+[child-move-reveals-parent-background.html]
+  expected: TIMEOUT
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 a87a2fc57ae..195a72f9ff6 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
@@ -332,3 +332,6 @@
   [Matching font-style: 'oblique 21deg' should prefer 'oblique 40deg 50deg' over 'oblique 20deg']
     expected: FAIL
 
+  [Matching font-style: 'oblique 0deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-transforms/animation/list-interpolation.html.ini b/tests/wpt/metadata/css/css-transforms/animation/list-interpolation.html.ini
index 1f995fa68f7..006c4415580 100644
--- a/tests/wpt/metadata/css/css-transforms/animation/list-interpolation.html.ini
+++ b/tests/wpt/metadata/css/css-transforms/animation/list-interpolation.html.ini
@@ -80,3 +80,9 @@
   [Mismatched lengths (to is shorter), partial match: Animation between "rotate(720deg) translateX(0px) scaleX(2)" and "rotate(0deg) scaleX(1)" at progress 0.25]
     expected: FAIL
 
+  [Match on rotation using collinear rotation axes: Animation between "rotate3d(1, 1, 1, -60deg) translateX(100px)" and "rotate3d(2, 2, 2, 60deg) translateY(200px)" at progress 0.25]
+    expected: FAIL
+
+  [Match on rotation with spherical interpolation: Animation between "rotate3d(1, 0, 0, 360deg) translateX(100px)" and "rotate3d(0, 1, 0, -720deg) translateY(200px)" at progress 0.25]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-values/calc-numbers.html.ini b/tests/wpt/metadata/css/css-values/calc-numbers.html.ini
new file mode 100644
index 00000000000..8e566956434
--- /dev/null
+++ b/tests/wpt/metadata/css/css-values/calc-numbers.html.ini
@@ -0,0 +1,28 @@
+[calc-numbers.html]
+  [testing tab-size: calc(bla) 10px]
+    expected: FAIL
+
+  [testing tab-size: calc(10px)]
+    expected: FAIL
+
+  [testing tab-size: calc(100%)]
+    expected: FAIL
+
+  [testing tab-size: calc(10px) bla]
+    expected: FAIL
+
+  [testing tab-size: calc(2 * 3)]
+    expected: FAIL
+
+  [testing tab-size: calc(2 * -4)]
+    expected: FAIL
+
+  [testing tab-size: calc(1 + 100%)]
+    expected: FAIL
+
+  [testing tab-size: calc(1 + 1px)]
+    expected: FAIL
+
+  [testing tab-size: calc(2 / 4)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
index bcd187f508c..8e2ceeddfbe 100644
--- a/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/scroll-behavior-smooth.html.ini
@@ -6,3 +6,6 @@
   [Instant scrolling while doing history navigation.]
     expected: FAIL
 
+  [Smooth scrolling while doing history navigation.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/geometry/interfaces.html.ini b/tests/wpt/metadata/css/geometry/interfaces.html.ini
index 01d6a39eb03..d93f9ea79a6 100644
--- a/tests/wpt/metadata/css/geometry/interfaces.html.ini
+++ b/tests/wpt/metadata/css/geometry/interfaces.html.ini
@@ -384,3 +384,21 @@
   [DOMMatrixReadOnly interface: operation scaleNonUniform(unrestricted double, unrestricted double)]
     expected: FAIL
 
+  [DOMPointReadOnly interface: default toJSON operation on new DOMPoint()]
+    expected: FAIL
+
+  [DOMPointReadOnly interface: default toJSON operation on new DOMPointReadOnly()]
+    expected: FAIL
+
+  [DOMRectReadOnly interface: default toJSON operation on new DOMRect()]
+    expected: FAIL
+
+  [DOMRectReadOnly interface: default toJSON operation on new DOMRectReadOnly()]
+    expected: FAIL
+
+  [DOMQuad interface: default toJSON operation on new DOMQuad()]
+    expected: FAIL
+
+  [DOMMatrixReadOnly interface: default toJSON operation on new DOMMatrixReadOnly()]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/geometry/interfaces.worker.js.ini b/tests/wpt/metadata/css/geometry/interfaces.worker.js.ini
index 3d74ff822d0..af0c3770015 100644
--- a/tests/wpt/metadata/css/geometry/interfaces.worker.js.ini
+++ b/tests/wpt/metadata/css/geometry/interfaces.worker.js.ini
@@ -107,3 +107,21 @@
   [DOMMatrixReadOnly interface: operation scaleNonUniform(unrestricted double, unrestricted double)]
     expected: FAIL
 
+  [DOMPointReadOnly interface: default toJSON operation on new DOMPoint()]
+    expected: FAIL
+
+  [DOMPointReadOnly interface: default toJSON operation on new DOMPointReadOnly()]
+    expected: FAIL
+
+  [DOMRectReadOnly interface: default toJSON operation on new DOMRect()]
+    expected: FAIL
+
+  [DOMRectReadOnly interface: default toJSON operation on new DOMRectReadOnly()]
+    expected: FAIL
+
+  [DOMQuad interface: default toJSON operation on new DOMQuad()]
+    expected: FAIL
+
+  [DOMMatrixReadOnly interface: default toJSON operation on new DOMMatrixReadOnly()]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/parser/parser-sets-attributes-and-children.html.ini b/tests/wpt/metadata/custom-elements/parser/parser-sets-attributes-and-children.html.ini
index b49624917df..b6001e8bba9 100644
--- a/tests/wpt/metadata/custom-elements/parser/parser-sets-attributes-and-children.html.ini
+++ b/tests/wpt/metadata/custom-elements/parser/parser-sets-attributes-and-children.html.ini
@@ -1,2 +1,2 @@
 [parser-sets-attributes-and-children.html]
-  expected: TIMEOUT
+  expected: CRASH
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index e68422b6dab..1e48c2cf084 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -2,7 +2,7 @@
   type: testharness
 
 [single-byte-decoder.html?document]
-  expected: TIMEOUT
+  expected: CRASH
   [ISO-8859-4: iso_8859-4:1988 (document.characterSet and document.inputEncoding)]
     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 18f786d4963..5bed0cee9f2 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,3 +312,9 @@
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 87c807a49ff..b7052af5b5c 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/hr-time/idlharness.any.js.ini b/tests/wpt/metadata/hr-time/idlharness.any.js.ini
index 446960c4847..baed1c98c0b 100644
--- a/tests/wpt/metadata/hr-time/idlharness.any.js.ini
+++ b/tests/wpt/metadata/hr-time/idlharness.any.js.ini
@@ -11,6 +11,9 @@
   [Test default toJSON operation of Performance]
     expected: FAIL
 
+  [Performance interface: default toJSON operation on performance]
+    expected: FAIL
+
 
 [idlharness.any.serviceworker.html]
   [idlharness]
@@ -41,3 +44,6 @@
   [Test default toJSON operation of Performance]
     expected: FAIL
 
+  [Performance interface: default toJSON operation on performance]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html.ini
deleted file mode 100644
index 9bacb9f5c4e..00000000000
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-abort/javascript-url-abort-return-value-string.tentative.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[javascript-url-abort-return-value-string.tentative.html]
-  [Aborting fetch for javascript:string navigation]
-    expected: FAIL
-
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
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/windows/embedded-opener.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener.html.ini
new file mode 100644
index 00000000000..d36355b8f61
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener.html.ini
@@ -0,0 +1,4 @@
+[embedded-opener.html]
+  [opener and embedded documents; using window.open()]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html.ini b/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html.ini
new file mode 100644
index 00000000000..c54712d9f30
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html.ini
@@ -0,0 +1,5 @@
+[link-multiple-error-events.html]
+  expected: ERROR
+  [Check if the <link>'s error event fires for each style sheet it fails to load]
+    expected: NOTRUN
+
diff --git a/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html.ini b/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html.ini
new file mode 100644
index 00000000000..80dfc509cd5
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html.ini
@@ -0,0 +1,5 @@
+[link-multiple-load-events.html]
+  expected: ERROR
+  [Check if the <link>'s load event fires for each style sheet it loads]
+    expected: NOTRUN
+
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/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/performance-timeline/idlharness.any.js.ini b/tests/wpt/metadata/performance-timeline/idlharness.any.js.ini
index 590af74cd85..4e0a9f3feb5 100644
--- a/tests/wpt/metadata/performance-timeline/idlharness.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/idlharness.any.js.ini
@@ -34,6 +34,9 @@
   [PerformanceMark interface object length]
     expected: FAIL
 
+  [PerformanceEntry interface: default toJSON operation on mark]
+    expected: FAIL
+
 
 [idlharness.any.html]
   [Untitled]
@@ -66,6 +69,9 @@
   [PerformanceMark interface object length]
     expected: FAIL
 
+  [PerformanceEntry interface: default toJSON operation on mark]
+    expected: FAIL
+
 
 [idlharness.https.any.serviceworker.html]
   type: testharness
diff --git a/tests/wpt/metadata/performance-timeline/po-observe-type.any.js.ini b/tests/wpt/metadata/performance-timeline/po-observe-type.any.js.ini
new file mode 100644
index 00000000000..928849cd870
--- /dev/null
+++ b/tests/wpt/metadata/performance-timeline/po-observe-type.any.js.ini
@@ -0,0 +1,33 @@
+[po-observe-type.any.html]
+  [Calling observe() with entryTypes and then type should throw an InvalidModificationError]
+    expected: FAIL
+
+  [Calling observe() with type and then entryTypes should throw an InvalidModificationError]
+    expected: FAIL
+
+  [Calling observe() with type and entryTypes should throw a SyntaxError]
+    expected: FAIL
+
+  [Passing in unknown values to type does throw an exception.]
+    expected: FAIL
+
+  [observe() with different type values stacks.]
+    expected: FAIL
+
+
+[po-observe-type.any.worker.html]
+  [Calling observe() with entryTypes and then type should throw an InvalidModificationError]
+    expected: FAIL
+
+  [Calling observe() with type and then entryTypes should throw an InvalidModificationError]
+    expected: FAIL
+
+  [Calling observe() with type and entryTypes should throw a SyntaxError]
+    expected: FAIL
+
+  [Passing in unknown values to type does throw an exception.]
+    expected: FAIL
+
+  [observe() with different type values stacks.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/performance-timeline/po-observe.any.js.ini b/tests/wpt/metadata/performance-timeline/po-observe.any.js.ini
index c5a0ff722eb..9f2213a6720 100644
--- a/tests/wpt/metadata/performance-timeline/po-observe.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/po-observe.any.js.ini
@@ -9,6 +9,15 @@
   [Check observer callback parameter and this values]
     expected: FAIL
 
+  [no 'type' or 'entryTypes' throws a SyntaxError]
+    expected: FAIL
+
+  [Empty sequence entryTypes does not throw an exception.]
+    expected: FAIL
+
+  [Unknown entryTypes do not throw an exception.]
+    expected: FAIL
+
 
 [po-observe.any.html]
   type: testharness
@@ -21,3 +30,12 @@
   [Check observer callback parameter and this values]
     expected: FAIL
 
+  [no 'type' or 'entryTypes' throws a SyntaxError]
+    expected: FAIL
+
+  [Empty sequence entryTypes does not throw an exception.]
+    expected: FAIL
+
+  [Unknown entryTypes do not throw an exception.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index 7725b118e9d..99a24216c88 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -12,6 +12,3 @@
   [Verifies the resolution of entry.startTime is at least 5 microseconds.]
     expected: TIMEOUT
 
-  [Verifies the resolution of performance.now() is at least 5 microseconds.]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/resource-timing/idlharness.any.js.ini b/tests/wpt/metadata/resource-timing/idlharness.any.js.ini
index b2bbf08bce4..043747e1f9d 100644
--- a/tests/wpt/metadata/resource-timing/idlharness.any.js.ini
+++ b/tests/wpt/metadata/resource-timing/idlharness.any.js.ini
@@ -56,9 +56,6 @@
   [PerformanceResourceTiming interface: attribute domainLookupStart]
     expected: FAIL
 
-  [PerformanceResourceTiming interface: resource must inherit property "redirectStart" with the proper type]
-    expected: PASS
-
   [PerformanceResourceTiming interface: attribute connectStart]
     expected: FAIL
 
@@ -80,12 +77,12 @@
   [PerformanceResourceTiming interface: attribute domainLookupEnd]
     expected: FAIL
 
-  [PerformanceResourceTiming interface: attribute redirectStart]
-    expected: PASS
-
   [PerformanceResourceTiming interface: resource must inherit property "connectEnd" with the proper type]
     expected: FAIL
 
+  [PerformanceResourceTiming interface: default toJSON operation on resource]
+    expected: FAIL
+
 
 [idlharness.any.worker.html]
   [PerformanceResourceTiming interface: resource must inherit property "workerStart" with the proper type]
@@ -187,6 +184,6 @@
   [PerformanceResourceTiming interface: attribute domainLookupEnd]
     expected: FAIL
 
-  [PerformanceResourceTiming interface: attribute redirectStart]
-    expected: PASS
+  [PerformanceResourceTiming interface: default toJSON operation on resource]
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success-and-failure.html.ini b/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success-and-failure.html.ini
new file mode 100644
index 00000000000..5b9a17d8f5b
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success-and-failure.html.ini
@@ -0,0 +1,4 @@
+[broadcastchannel-success-and-failure.html]
+  [WebAssembly.Module cannot cross agent clusters, BroadcastChannel edition]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success.html.ini b/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success.html.ini
new file mode 100644
index 00000000000..50d9fdee6c9
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/broadcastchannel-success.html.ini
@@ -0,0 +1,4 @@
+[broadcastchannel-success.html]
+  [Structured cloning of WebAssembly.Module: BroadcastChannel within the same agent cluster]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/identity-not-preserved.html.ini b/tests/wpt/metadata/wasm/serialization/module/identity-not-preserved.html.ini
new file mode 100644
index 00000000000..1e92fb501c5
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/identity-not-preserved.html.ini
@@ -0,0 +1,11 @@
+[identity-not-preserved.html]
+  expected: ERROR
+  [postMessaging to this window does not give back the same WebAssembly.Module]
+    expected: TIMEOUT
+
+  [postMessaging to a worker and back does not give back the same WebAssembly.Module]
+    expected: TIMEOUT
+
+  [postMessaging to an iframe and back does not give back the same WebAssembly.Module]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/nested-worker-success.any.js.ini b/tests/wpt/metadata/wasm/serialization/module/nested-worker-success.any.js.ini
new file mode 100644
index 00000000000..c5630c0fce9
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/nested-worker-success.any.js.ini
@@ -0,0 +1,9 @@
+[nested-worker-success.any.sharedworker.html]
+  [nested-worker-success]
+    expected: FAIL
+
+
+[nested-worker-success.any.worker.html]
+  [postMessaging to a dedicated sub-worker allows them to see each others' modifications]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/no-transferring.html.ini b/tests/wpt/metadata/wasm/serialization/module/no-transferring.html.ini
new file mode 100644
index 00000000000..af448eaecf2
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/no-transferring.html.ini
@@ -0,0 +1,10 @@
+[no-transferring.html]
+  [Trying to transfer a WebAssembly.Module to a worker throws]
+    expected: FAIL
+
+  [Trying to transfer a WebAssembly.Module through a MessagePort throws]
+    expected: FAIL
+
+  [Trying to transfer a WebAssembly.Module to this window throws]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/serialization-via-idb.any.js.ini b/tests/wpt/metadata/wasm/serialization/module/serialization-via-idb.any.js.ini
new file mode 100644
index 00000000000..8246a96c4ee
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/serialization-via-idb.any.js.ini
@@ -0,0 +1,15 @@
+[serialization-via-idb.any.html]
+  [WebAssembly.Module cloning via the IndexedDB: is interleaved correctly]
+    expected: FAIL
+
+  [WebAssembly.Module cloning via IndexedDB: basic case]
+    expected: FAIL
+
+
+[serialization-via-idb.any.worker.html]
+  [WebAssembly.Module cloning via the IndexedDB: is interleaved correctly]
+    expected: FAIL
+
+  [WebAssembly.Module cloning via IndexedDB: basic case]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/serialization-via-notifications-api.any.js.ini b/tests/wpt/metadata/wasm/serialization/module/serialization-via-notifications-api.any.js.ini
new file mode 100644
index 00000000000..ed99d9c8b60
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/serialization-via-notifications-api.any.js.ini
@@ -0,0 +1,15 @@
+[serialization-via-notifications-api.any.worker.html]
+  [WebAssembly.Module cloning via the Notifications API's data member: basic case]
+    expected: FAIL
+
+  [WebAssembly.Module cloning via the Notifications API's data member: is interleaved correctly]
+    expected: FAIL
+
+
+[serialization-via-notifications-api.any.html]
+  [WebAssembly.Module cloning via the Notifications API's data member: basic case]
+    expected: FAIL
+
+  [WebAssembly.Module cloning via the Notifications API's data member: is interleaved correctly]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-domain-success.sub.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-domain-success.sub.html.ini
new file mode 100644
index 00000000000..cc8bf757e8f
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-domain-success.sub.html.ini
@@ -0,0 +1,4 @@
+[window-domain-success.sub.html]
+  [postMessaging to a same-origin-domain (but not same-origin) iframe allows them to instantiate]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-messagechannel-success.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-messagechannel-success.html.ini
new file mode 100644
index 00000000000..3d5f3dffc9f
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-messagechannel-success.html.ini
@@ -0,0 +1,4 @@
+[window-messagechannel-success.html]
+  [postMessaging to a dedicated worker via MessageChannel allows them to instantiate]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-serviceworker-failure.https.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-serviceworker-failure.https.html.ini
new file mode 100644
index 00000000000..e364efb71bd
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-serviceworker-failure.https.html.ini
@@ -0,0 +1,4 @@
+[window-serviceworker-failure.https.html]
+  [WebAssembly.Module cannot cross agent clusters, service worker edition]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-sharedworker-failure.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-sharedworker-failure.html.ini
new file mode 100644
index 00000000000..8b35b3b7739
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-sharedworker-failure.html.ini
@@ -0,0 +1,4 @@
+[window-sharedworker-failure.html]
+  [WebAssembly.Modules cannot cross agent clusters, shared worker edition]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html.ini
new file mode 100644
index 00000000000..6383bcb6d88
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html.ini
@@ -0,0 +1,4 @@
+[window-similar-but-cross-origin-success.sub.html]
+  [postMessaging to a not same-origin-domain, but similar origin, iframe allows them to instantiate]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/serialization/module/window-simple-success.html.ini b/tests/wpt/metadata/wasm/serialization/module/window-simple-success.html.ini
new file mode 100644
index 00000000000..45431db4f4e
--- /dev/null
+++ b/tests/wpt/metadata/wasm/serialization/module/window-simple-success.html.ini
@@ -0,0 +1,13 @@
+[window-simple-success.html]
+  [postMessaging to a same-origin opened window allows them to instantiate]
+    expected: FAIL
+
+  [postMessaging to a same-origin deeply-nested iframe allows them to instantiate]
+    expected: FAIL
+
+  [postMessaging to a dedicated worker allows them to instantiate]
+    expected: FAIL
+
+  [postMessaging to a same-origin iframe allows them to instantiate]
+    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/workers/Worker-location.sub.any.js.ini b/tests/wpt/metadata/workers/Worker-location.sub.any.js.ini
new file mode 100644
index 00000000000..d9d6a40c57d
--- /dev/null
+++ b/tests/wpt/metadata/workers/Worker-location.sub.any.js.ini
@@ -0,0 +1,9 @@
+[Worker-location.sub.any.sharedworker.html]
+  [Worker-location]
+    expected: FAIL
+
+
+[Worker-location.sub.any.worker.html]
+  [Test WorkerLocation properties.]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index 41d5f560f08..74f6a917d87 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -13,6 +13,11 @@
 #  - A scheduled build needs to be set up for the the epochs/daily branch.
 #  - To get results from scheduled builds into wpt.fyi, a service connection
 #    named wpt.fyi with URL https://wpt.fyi is needed.
+#  - Self-hosted agents for Windows 10 are used:
+#    - 'Hosted Windows Client' is the latest Windows 10
+#    - 'Hosted Windows Client Next' is Windows 10 Insider Preview
+#    Documention for the setup of these agents:
+#    https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/v2-windows
 
 jobs:
 # The affected tests jobs are unconditional for speed, as most PRs have one or
@@ -127,6 +132,59 @@ jobs:
     parameters:
       directory: tools/wpt/
 
+- job: infrastructure_win10
+  displayName: 'infrastructure/ tests (Windows 10)'
+  # This job is only triggered manually until it has been shown to be robust.
+  condition: and(eq(variables['Build.Reason'], 'Manual'), variables['run_infrastructure_win10'])
+  pool:
+    name: 'Hosted Windows Client'
+  steps:
+  - template: tools/ci/azure/system_info.yml
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/install_python.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: python ./wpt run --yes --no-manifest-update --install-fonts --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-tbpl $(Build.ArtifactStagingDirectory)/edge.tbpl.log --log-tbpl-level info edge_webdriver infrastructure/
+    displayName: 'Run tests (Edge)'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'infrastructure'
+    condition: succeededOrFailed()
+  - template: tools/ci/azure/cleanup_win10.yml
+
+- job: all_edge
+  displayName: 'all tests (Edge)'
+  # This job is only triggered manually until it has been shown to be robust.
+  condition: and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge'])
+  # There are 5 agents in the pool, but use more jobs so that each takes <1h.
+  strategy:
+    parallel: 20
+  timeoutInMinutes: 360
+  pool:
+    name: 'Hosted Windows Client'
+  steps:
+  - template: tools/ci/azure/system_info.yml
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/install_python.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: python ./wpt run --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --test-types reftest testharness --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json edge_webdriver
+    displayName: 'Run tests'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'results'
+  - template: tools/ci/azure/cleanup_win10.yml
+
 - job: all_macOS
   displayName: 'all tests (Safari Technology Preview)'
   condition: eq(variables['Build.Reason'], 'Schedule')
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-with-fill-mode.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-with-fill-mode.https.html
index 49fead8bd39..b910ab280ec 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-with-fill-mode.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-with-fill-mode.https.html
@@ -14,83 +14,146 @@
 }
 </style>
 
-<script>
-function CreateTest(target, effect, verify, test_name) {
-  promise_test(async function() {
-    await registerConstantLocalTimeAnimator(2000);
-    const animation = new WorkletAnimation('constant_time', effect);
-    animation.play();
+<div id="target" class='target'></div>
 
-    await waitForAsyncAnimationFrames(1);
-    // waitTwoAnimationFrames guarantees a compositor frame that could update
-    // the opacity value in the worklet. Meanwhile, getComputedStyle needs an
-    // extra frame to fetch the updated value.
-    await waitForNextFrame();
-    verify();
-    animation.cancel();
-  }, test_name);
+<script>
+setup(setupAndRegisterTests, {explicit_done: true});
+
+function setupAndRegisterTests() {
+  registerConstantLocalTimeAnimator(2000).then(() => {
+    promise_test(
+        effect_with_fill_mode_forwards,
+        "Effect with fill mode forwards in after phase produces output that is equivalent to effect's end value.");
+
+    promise_test(
+        effect_without_fill_mode_forwards,
+        'Effect without fill mode forwards in after phase (local time beyond end) should deactivate the animation.');
+
+    promise_test(
+        effect_without_fill_forwards_at_end,
+        'Effect without fill mode in after phase (local time at end) should deactivate the animation.');
+
+    promise_test(
+        effect_with_fill_backwards,
+        "Effect with fill mode backwards in before phase produces output that is equivalent to effect's start value.");
+
+    promise_test(
+        effect_without_fill_backwards,
+        'Effect without fill mode backwards in before phase (local time before start) should deactivate the animation.');
+
+    promise_test(
+        effect_without_fill_backwards_at_start,
+        'Effect with local time at start point is in active phase.');
+
+    done();
+  });
+}
+
+async function effect_with_fill_mode_forwards(t) {
+      const effect_with_fill_forwards = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 1000, fill: 'forwards' });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_with_fill_forwards);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '0');
+
+      animation.cancel();
+}
+
+async function effect_without_fill_mode_forwards(t) {
+      const effect_without_fill_forwards = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 1000 });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_without_fill_forwards);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '1');
+
+      animation.cancel();
+}
+
+async function effect_without_fill_forwards_at_end(t) {
+      const effect_without_fill_forwards_at_end = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 2000 });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_without_fill_forwards_at_end);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '1');
+
+      animation.cancel();
+}
+
+async function effect_with_fill_backwards(t) {
+      const effect_with_fill_backwards = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 1000, delay: 2001, fill: 'backwards' });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_with_fill_backwards);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '0.5');
+
+      animation.cancel();
+}
+
+async function effect_without_fill_backwards(t) {
+      const effect_without_fill_backwards = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 1000, delay: 2001 });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_without_fill_backwards);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '1');
+
+      animation.cancel();
+}
+
+async function effect_without_fill_backwards_at_start(t) {
+      const effect_without_fill_backwards_at_start = new KeyframeEffect(
+          target,
+          { opacity: [0.5, 0] },
+          { duration: 1000, delay: 2000 });
+      const animation = new WorkletAnimation(
+          'constant_time',
+          effect_without_fill_backwards_at_start);
+      animation.play();
+
+      await waitForAsyncAnimationFrames(1);
+      await waitForNextFrame();
+
+      assert_equals(getComputedStyle(target).opacity, '0.5');
+
+      animation.cancel();
 }
 </script>
-
-<div id="target1" class='target'></div>
-<div id="target2" class='target'></div>
-<div id="target3" class='target'></div>
-<div id="target4" class='target'></div>
-<div id="target5" class='target'></div>
-<div id="target6" class='target'></div>
-
-<script>
-  const effect_with_fill_forwards = new KeyframeEffect(
-      target1,
-      { opacity: [0.5, 0] },
-      { duration: 1000, fill: 'forwards' });
-  CreateTest(target1,
-      effect_with_fill_forwards,
-      function() { assert_equals(getComputedStyle(target1).opacity, '0'); },
-      "Effect with fill mode forwards in after phase produces output that is equivalent to effect's end value.");
-
-  const effect_without_fill_forwards = new KeyframeEffect(
-      target2,
-      { opacity: [0.5, 0] },
-      { duration: 1000 });
-  CreateTest(target2,
-      effect_without_fill_forwards,
-      function() { assert_equals(getComputedStyle(target2).opacity, '1'); },
-      'Effect without fill mode forwards in after phase (local time beyond end) should deactivate the animation.');
-
-  const effect_without_fill_forwards_at_end = new KeyframeEffect(
-      target3,
-      { opacity: [0.5, 0] },
-      { duration: 2000 });
-  CreateTest(target3,
-      effect_without_fill_forwards_at_end,
-      function() { assert_equals(getComputedStyle(target3).opacity, '1'); },
-      'Effect without fill mode in after phase (local time at end) should deactivate the animation.');
-
-  const effect_with_fill_backwards = new KeyframeEffect(
-      target4,
-      { opacity: [0.5, 0] },
-      { duration: 1000, delay: 2001, fill: 'backwards' });
-  CreateTest(target4,
-      effect_with_fill_backwards,
-      function() { assert_equals(getComputedStyle(target4).opacity, '0.5'); },
-      "Effect with fill mode backwards in before phase produces output that is equivalent to effect's start value.");
-
-  const effect_without_fill_backwards = new KeyframeEffect(
-      target5,
-      { opacity: [0.5, 0] },
-      { duration: 1000, delay: 2001 });
-  CreateTest(target5,
-      effect_without_fill_backwards,
-      function() { assert_equals(getComputedStyle(target5).opacity, '1'); },
-      'Effect without fill mode backwards in before phase (local time before start) should deactivate the animation.');
-
-  const effect_without_fill_backwards_at_start = new KeyframeEffect(
-      target6,
-      { opacity: [0.5, 0] },
-      { duration: 1000, delay: 2000 });
-  CreateTest(target6,
-      effect_without_fill_backwards_at_start,
-      function() { assert_equals(getComputedStyle(target6).opacity, '0.5'); },
-      'Effect with local time at start point is in active phase.');
-</script>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background-ref.html b/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background-ref.html
new file mode 100644
index 00000000000..10324966edb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<style>
+  #parent {
+    width: 150px;
+    height: 150px;
+    background-color: green;
+  }
+</style>
+<p>There should be a green square below.</p>
+<div id="parent"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background.html b/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background.html
new file mode 100644
index 00000000000..e369eccd07f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/child-move-reveals-parent-background.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Child moves and reveals previously obscured background of the parent</title>
+<link rel="match" href="child-move-reveals-parent-background-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds">
+<script src="/common/reftest-wait.js"></script>
+<style>
+  #parent {
+    width: 150px;
+    height: 150px;
+    background-color: green;
+  }
+  #child {
+    width: 150px;
+    height: 150px;
+    background-color: white;
+    position: relative;
+  }
+</style>
+<p>There should be a green square below.</p>
+<div id="parent">
+  <div id="child"></div>
+</div>
+<script>
+  requestAnimationFrame(() => requestAnimationFrame(() => {
+    child.style.left = '150px';
+    takeScreenshot();
+  }));
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-env/supports-script.tentative.html b/tests/wpt/web-platform-tests/css/css-env/supports-script.tentative.html
index ec9b6d0dfe6..7ab4db23a37 100644
--- a/tests/wpt/web-platform-tests/css/css-env/supports-script.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-env/supports-script.tentative.html
@@ -11,6 +11,8 @@
     test(() => {
       assert_true(CSS.supports("background: env(test)"));
       assert_true(CSS.supports("background", "env(test)"));
+      assert_true(CSS.supports("background", "env(test, 10px)"));
+      assert_true(CSS.supports("background", "foobar(env(test))"));
       assert_false(CSS.supports("background", "env()"));
       assert_false(CSS.supports("background", "env(test,)"));
     });
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-011.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-011.html
new file mode 100644
index 00000000000..058ca6c3bab
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-011.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <meta charset="utf-8">
+  <title>CSS Multi-column Layout Test: Insert a block containing a spanner kid. The spanner kid should correctly span across all columns</title>
+  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
+  <link rel="match" href="multicol-span-all-dynamic-add-003-ref.html">
+  <meta name="assert" content="This test checks that an inserted block containing 'column-span' element should be rendered correctly.">
+
+  <script>
+  function runTest() {
+    document.body.offsetHeight;
+
+    // Create a subtree like the following, and insert it into column as the
+    // first child.
+    // <div>
+    //   block1
+    //   <h3>spanner</h3>
+    // </div>
+    var spanner = document.createElement("h3");
+    var spannerText = document.createTextNode("spanner");
+    spanner.appendChild(spannerText);
+
+    var block1 = document.createElement("div");
+    var block1Text = document.createTextNode("block1");
+    block1.appendChild(block1Text)
+    block1.appendChild(spanner);
+
+    var column = document.getElementById("column");
+    column.insertBefore(block1, column.children[0]);
+
+    document.documentElement.removeAttribute("class");
+  }
+  </script>
+
+  <style>
+  #column {
+    column-count: 3;
+    column-rule: 6px solid;
+    width: 400px;
+    outline: 1px solid black;
+  }
+  h3 {
+    column-span: all;
+    outline: 1px solid blue;
+  }
+  </style>
+
+  <body onload="runTest();">
+    <article id="column">
+      <div>block2</div>
+    </article>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012-ref.html
new file mode 100644
index 00000000000..61b45cc6507
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <meta charset="utf-8">
+  <title>CSS Multi-column Layout Test Reference: Append a block containing a spanner kid. The spanner kid should correctly span across all columns</title>
+  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+
+  <style>
+  #column {
+    column-count: 3;
+    column-rule: 6px solid;
+    width: 400px;
+    outline: 1px solid black;
+  }
+  h3 {
+    column-span: all;
+    outline: 1px solid blue;
+  }
+  </style>
+
+  <body>
+    <article id="column">
+      <div>block1
+        <div>
+          <h3>spanner</h3>
+          block2
+        </div>
+      </div>
+    </article>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012.html
new file mode 100644
index 00000000000..7e152af15eb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-span-all-dynamic-add-012.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <meta charset="utf-8">
+  <title>CSS Multi-column Layout Test: Append a block containing a spanner kid. The spanner kid should correctly span across all columns</title>
+  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
+  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
+  <link rel="match" href="multicol-span-all-dynamic-add-012-ref.html">
+  <meta name="assert" content="This test checks that an appended block containing 'column-span' element should be rendered correctly.">
+
+  <script>
+  function runTest() {
+    document.body.offsetHeight;
+
+    // Create a subtree like the following, and append it to block1.
+    // <div>
+    //   <h3>spanner</h3>
+    //   block2
+    // </div>
+    var spanner = document.createElement("h3");
+    var spannerText = document.createTextNode("spanner");
+    spanner.appendChild(spannerText);
+
+    var block2 = document.createElement("div");
+    var block2Text = document.createTextNode("block2");
+    block2.appendChild(spanner);
+    block2.appendChild(block2Text)
+
+    var block1 = document.getElementById("block1");
+    block1.appendChild(block2);
+
+    document.documentElement.removeAttribute("class");
+  }
+  </script>
+
+  <style>
+  #column {
+    column-count: 3;
+    column-rule: 6px solid;
+    width: 400px;
+    outline: 1px solid black;
+  }
+  h3 {
+    column-span: all;
+    outline: 1px solid blue;
+  }
+  </style>
+
+  <body onload="runTest();">
+    <article id="column">
+      <div id="block1">block1</div>
+    </article>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-max-width-beside-float.html b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-max-width-beside-float.html
new file mode 100644
index 00000000000..be82ac0da66
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-max-width-beside-float.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#available">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#percentage-sizing">
+<p>There should be a green square below, and no red.</p>
+<div id="container" style="width:100px; background:red;">
+  <div style="float:right; width:50px; height:100px; background:green;"></div>
+  <div style="display:table; max-width:50%; height:100px; background:green;" data-expected-width="50">
+    <div style="float:left; width:20px; height:10px;"></div>
+    <div style="float:left; width:20px; height:10px;"></div>
+    <div style="float:left; width:20px; height:10px;"></div>
+  </div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-below-float.html b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-below-float.html
new file mode 100644
index 00000000000..400a87dd175
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-below-float.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#available">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#percentage-sizing">
+<p>There should be a blue square below.</p>
+<div id="container" style="width:100px;">
+  <div style="float:right; width:50px; height:10px;"></div>
+  <div style="display:table; width:10px; min-width:100%; height:100px; background:blue;" data-expected-width="100"></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-beside-float.html b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-beside-float.html
new file mode 100644
index 00000000000..d763c927016
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/table-percentage-min-width-beside-float.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#available">
+<link rel="help" href="https://drafts.csswg.org/css-sizing/#percentage-sizing">
+<p>There should be a green square below, and no red.</p>
+<div id="container" style="width:100px; background:red;">
+  <div style="float:right; width:50px; height:100px; background:green;"></div>
+  <div style="display:table; width:10px; min-width:50%; height:100px; background:green;" data-expected-width="50"></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html b/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html
new file mode 100644
index 00000000000..0a69faa39c1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-syntax/urange-parsing.html
@@ -0,0 +1,173 @@
+<!doctype html>
+<title>Urange Parsing</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+@font-face {
+    font-family: foo;
+    src: url(http://example.com);
+}
+
+.error {}
+
+</style>
+
+<meta name=author title="Tab Atkins-Bittner">
+<link rel=help href="https://drafts.csswg.org/css-syntax/#urange-syntax">
+
+<script>
+
+function testUrange(input, expected) {
+    test(()=>{
+        const rule = document.styleSheets[0].cssRules[0];
+        rule.style.unicodeRange = "U+1357";
+        rule.style.unicodeRange = input;
+        assert_equals(rule.style.unicodeRange.toUpperCase(), expected.toUpperCase());
+    }, `"${input}" => "${expected}"`)
+}
+function testInvalidUrange(input) {
+    test(()=>{
+        const rule = document.styleSheets[0].cssRules[0];
+        rule.style.unicodeRange = "U+1357";
+        rule.style.unicodeRange = input;
+        assert_equals(rule.style.unicodeRange.toUpperCase(), "U+1357");
+    }, `"${input}" is invalid`);
+}
+
+/* First exercise all the clauses individually */
+//<urange> =
+//  u '+' <ident-token> '?'* |
+/* comments can go between tokens */
+testUrange("u/**/+/**/a/**/?", "U+A0-AF");
+/* capitalization doesn't matter */
+testUrange("u+abc", "U+ABC");
+testUrange("U+abc", "U+ABC");
+testUrange("u+ABC", "U+ABC");
+testUrange("U+ABC", "U+ABC");
+testUrange("u+AbC", "U+ABC");
+/* only hex */
+testInvalidUrange("u+efg");
+/* no spacing */
+testInvalidUrange("u+ abc");
+testInvalidUrange("u +abc");
+testInvalidUrange("u + abc");
+testInvalidUrange("U + a b c");
+/* 1-6 characters */
+testUrange("u+a", "U+A");
+testUrange("u+aa", "U+AA");
+testUrange("u+aaa", "U+AAA");
+testUrange("u+aaaa", "U+AAAA");
+testUrange("u+aaaaa", "U+AAAAA");
+testInvalidUrange("u+aaaaaaa");
+/* Or ? at the end, still up to 6 */
+testUrange("u+a?", "U+A0-AF");
+testUrange("u+a??", "U+A00-AFF");
+testUrange("u+a???", "U+A000-AFFF");
+testUrange("u+a????", "U+A0000-AFFFF");
+testInvalidUrange("u+aaaaaa?");
+testInvalidUrange("u+aaaaa??");
+testInvalidUrange("u+aaaa???");
+testInvalidUrange("u+aaa????");
+testInvalidUrange("u+aa?????");
+testInvalidUrange("u+a??????");
+/* no characters after ? */
+testInvalidUrange("u+a?a");
+// Too large!
+testInvalidUrange("u+aaaaaa");
+testInvalidUrange("u+a?????");
+
+//  u <dimension-token> '?'* |
+testUrange("u/**/+0a/**/?", "U+A0-AF");
+testUrange("u+0a", "U+A");
+testUrange("U+0a0", "U+A0");
+testUrange("u+0aaaaa", "U+AAAAA");
+testInvalidUrange("u+0aaaaaa");
+testUrange("u+0a0000", "U+A0000");
+testInvalidUrange("u+0a00000");
+testInvalidUrange("u+0aaaaa0");
+testUrange("u+00000a", "U+A");
+testInvalidUrange("u+00000aa");
+testInvalidUrange("u+00000a0")
+testInvalidUrange("u+000000a");
+testUrange("u+0a????", "U+A0000-AFFFF");
+testInvalidUrange("u+0a?????");
+testInvalidUrange("u+00a????");
+// Too large!
+testInvalidUrange("u+22222a");
+// Scinot!
+testUrange("u+1e9a", "U+1E9A");
+
+//  u <number-token> '?'* |
+testUrange("u/**/+0/**/?", "U+0-F");
+testInvalidUrange("u/**/0");
+testUrange("u+0", "U+0");
+testUrange("u+00", "U+0");
+testUrange("u+000", "U+0");
+testUrange("u+0000", "U+0");
+testUrange("u+00000", "U+0");
+testUrange("u+000000", "U+0");
+testInvalidUrange("u+0000000");
+testUrange("u+00000?", "U+0-F");
+testUrange("u+0?????", "U+0-FFFFF");
+testInvalidUrange("u+0?a");
+testInvalidUrange("u+000000?");
+testInvalidUrange("u+00000??");
+testInvalidUrange("u+0??????");
+// Scinot!
+testUrange("u+1e3", "U+1E3");
+testUrange("u+1e-20", "U+1E-20");
+// Too large!
+testInvalidUrange("u+222222");
+testInvalidUrange("u+2?????");
+
+//  u <number-token> <dimension-token> |
+testUrange("u/**/+0/**/-0a", "U+0-A");
+testUrange("u+0-0a", "U+0-A");
+testUrange("u+000000-0aaaaa", "U+0-AAAAA");
+testInvalidUrange("u+0000000-0a");
+testInvalidUrange("u+0-0aaaaaa");
+testInvalidUrange("u+0-000000a");
+testInvalidUrange("u+0+0a");
+testInvalidUrange("u+0?-0a");
+testInvalidUrange("u+0-0a?");
+// Too large!
+testInvalidUrange("u+222222-22222a");
+
+//  u <number-token> <number-token> |
+testUrange("u/**/+0/**/-1", "U+0-1");
+testUrange("u+0-1", "U+0-1");
+testInvalidUrange("u-0-1");
+testInvalidUrange("u-0+1");
+testInvalidUrange("u+0+1");
+testUrange("u+000000-000001", "U+0-1");
+testInvalidUrange("u+0000000-1");
+testInvalidUrange("u+0-0000001");
+// Too large!
+testInvalidUrange("u+0-222222");
+
+//  u '+' '?'+
+testUrange("u/**/+/**/?", "U+0-F");
+testUrange("u+?", "U+0-F");
+testUrange("u+?????", "u+0-FFFFF");
+testInvalidUrange("u+???????");
+testInvalidUrange("u+?a");
+// U+FFFFFF is too large!
+testInvalidUrange("u+??????");
+
+
+/* Finally, verify that u+a is properly parsed
+   as IDENT(u) DELIM(+) IDENT(a) in other contexts */
+
+test(()=>{
+    const rule = document.styleSheets[0].cssRules[1];
+    // Establish that it works with whitespace...
+    rule.selectorText = "u + a";
+    assert_equals(rule.selectorText, "u + a");
+    // And then again without...
+    rule.selectorText = ".error";
+    rule.selectorText = "u+a";
+    assert_equals(rule.selectorText, "u + a");
+}, "u+a is a valid selector");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-loose.html
index cf7c5a44415..def6adf0da7 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-loose.html
@@ -89,17 +89,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-normal.html
index 7c701c8546d..bc204f5377d 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-normal.html
@@ -89,17 +89,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-strict.html
index 9fe18046fcd..cdb83982482 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cj-strict.html
@@ -89,17 +89,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-loose.html
index 6120e62cc9b..c932cb4fa3f 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-loose.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-normal.html
index 1e1d4bb683b..7816fb53b0b 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-normal.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-strict.html
index ddf3c2cc960..833e45e6b58 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-cpm-strict.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-loose.html
index 647bfc8a675..fbb13ec8c34 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-loose.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-normal.html
index 5e22458f935..dc22d6161f0 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-normal.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-strict.html
index 3db8bb8804d..cd5d5aa9395 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-hyphens-strict.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-loose.html
index 09c5758d79a..235d38177cb 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-loose.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-normal.html
index 8bf3aa9016d..7bdedd5a82f 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-normal.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-strict.html
index 3c14e183d84..58c05bb0868 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-in-strict.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-loose.html
index dbf77a0f806..49f51f4b7d2 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-loose.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-normal.html
index ecdcdc31733..55f54ea84b1 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-normal.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-strict.html
index 3b2a2ee9eb1..1c2cd9a5d43 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-iteration-strict.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-loose.html
index 795cb0230b6..4d79a122780 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-loose.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if ja and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if ja and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-normal.html
index 7c591eb936a..eb3003c2721 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-normal.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-strict.html
index c41ea732a89..08e16f26321 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/ja/css-text-line-break-ja-po-strict.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="ja">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if ja and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if ja and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-loose.html
index b9f81eeecf5..4044e10666d 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-loose.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-normal.html
index 7d2af701422..01096b26bae 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-normal.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-strict.html
index 069212e628e..8460aaa0de7 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-cpm-strict.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-loose.html
index 70ebdc0898b..724f77692a4 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-loose.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-normal.html
index 8fd631efb3f..e89c9b8b85c 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-normal.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-strict.html
index 91f261018b1..b9585d77aba 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-hyphens-strict.html
@@ -42,17 +42,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-loose.html
index 4f163719ae7..e7686617a0a 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-loose.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-normal.html
index bb0df2e8fc1..a9409cfe8d7 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-normal.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-strict.html
index 965d5133fab..defdf223074 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-in-strict.html
@@ -43,17 +43,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-loose.html
index 72c476cdce7..64f821925c0 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-loose.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-normal.html
index 92ac2e02091..a7f66ea2b6b 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-normal.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-strict.html
index 22ac4baf03b..0b1ca2a6c16 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-iteration-strict.html
@@ -44,17 +44,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-loose.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-loose.html
index 0e0280505fa..04a0f4d620f 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-loose.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-loose.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文文<br/>&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may appear at line start if zh and loose');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may appear at line start if zh and loose');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-normal.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-normal.html
index 490e4067a40..5a52cf853e2 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-normal.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-normal.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and normal');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and normal');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-strict.html b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-strict.html
index ec44c093a32..d85b74a5405 100644
--- a/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-strict.html
+++ b/tests/wpt/web-platform-tests/css/css-text/i18n/zh/css-text-line-break-zh-po-strict.html
@@ -48,17 +48,26 @@ for (var i=0;i<lines.length;i++) {
 	 '<div class="ref" id="ref'+i+'" lang="zh">文文文文文<br/>文&#x'+hex+';字<span id="refSpan'+i+'">字</span></div>' +
 	 '</div>'
 	}
+function spansNearEnough(counter) {
+  return Math.abs( document.getElementById('testSpan'+counter).getBoundingClientRect().left
+           - document.getElementById('refSpan'+counter).getBoundingClientRect().left ) < 1;
+}
+
 document.querySelector('body').innerHTML = out
-// hide successful tests
-for (i=0;i<lines.length;i++) {
-    if (document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft) document.getElementById('test'+i).parentNode.style.display = 'none'
-    }
-// run the test framework
- for (i=0;i<lines.length;i++) {
-   test(function() {
-        assert_true(document.getElementById('testSpan'+i).offsetLeft === document.getElementById('refSpan'+i).offsetLeft);
-        }, lines[i]+' may NOT appear at line start if zh and strict');
-   }
+setup({explicit_done: true});
+
+document.fonts.ready.then(validate);
+
+function validate() {
+  for (i=0;i<lines.length;i++) {
+    test(function() {
+      assert_true(spansNearEnough(i));
+    }, lines[i]+' may NOT appear at line start if zh and strict');
+    // Hide successful tests.
+    if (spansNearEnough(i)) document.getElementById('test'+i).parentNode.style.display = 'none'
+  }
+  done();
+}
 </script>
 <!--Notes:
 The test creates a box with room for 6 characters, causing wrapping to occur either between the 6th and the 7th character, or before the 6th if the breaks after the 6th or before the 7th are prohibited.
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/animation/list-interpolation.html b/tests/wpt/web-platform-tests/css/css-transforms/animation/list-interpolation.html
index af221e5feae..4755279d73c 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/animation/list-interpolation.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/animation/list-interpolation.html
@@ -106,6 +106,24 @@ test_interpolation(
   'Match on rotation due to 0deg angle'
 );
 
+test_interpolation(
+  {
+    property: 'transform',
+    from: 'rotate3d(1, 1, 1, -60deg) translateX(100px)',
+    to: 'rotate3d(2, 2, 2, 60deg) translateY(200px)',
+  }, [{ at: 0.25, expect: 'rotate3d(1, 1, 1, -30deg) translate(75px, 50px)' }],
+  'Match on rotation using collinear rotation axes'
+);
+
+test_interpolation(
+  {
+    property: 'transform',
+    from: 'rotate3d(1, 0, 0, 360deg) translateX(100px)',
+    to: 'rotate3d(0, 1, 0, -720deg) translateY(200px)',
+  }, [{ at: 0.25, expect: 'rotate3d(0, 0, 1, 0deg) translate(75px, 50px)' }],
+  'Match on rotation with spherical interpolation'
+);
+
 test_interpolation(
   {
     property: 'transform',
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform-2d-getComputedStyle-001.html b/tests/wpt/web-platform-tests/css/css-transforms/transform-2d-getComputedStyle-001.html
index a085b794fc4..8fc4f9380fe 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform-2d-getComputedStyle-001.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform-2d-getComputedStyle-001.html
@@ -63,7 +63,15 @@
 	<div id="matrix" class="block"></div>
     <script type="text/javascript">
     function getTransformFor(id) {
-    	return window.getComputedStyle(document.getElementById(id)).getPropertyValue("transform");
+      let transform =
+        window.getComputedStyle(document.getElementById(id)).getPropertyValue("transform");
+      // Round matrix arguments to allow for small errors in numerical precision.
+      transform = transform.replace(/matrix\(([^\)]*)\)/g, function(match, arguments) {
+        let parts = arguments.split(",");
+        parts = parts.map(str => parseFloat(parseFloat(str).toFixed(6)));
+        return 'matrix(' + parts.join(", ") + ')';
+      });
+      return transform;
     }
     function clear(id) {
     	document.getElementById(id).style.display = 'none';
diff --git a/tests/wpt/web-platform-tests/css/css-values/calc-numbers.html b/tests/wpt/web-platform-tests/css/css-values/calc-numbers.html
new file mode 100644
index 00000000000..5c2c91d7a8c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-values/calc-numbers.html
@@ -0,0 +1,88 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Values and Units Test: computed value of 'tab-size' and 'opacity' when specified with calc() function</title>
+
+  <!--
+
+  Original test is:
+
+https://chromium.googlesource.com/chromium/src/+/c825d655f6aaf73484f9d56e9012793f5b9668cc/third_party/WebKit/LayoutTests/css3/calc/calc-numbers.html
+
+  -->
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="help" href="https://www.w3.org/TR/css-color-3/#transparency">
+  <link rel="help" href="https://www.w3.org/TR/css-text-3/#tab-size-property">
+  <link rel="help" href="https://www.w3.org/TR/css3-values/#calc-computed-value">
+
+  <meta name="flags" content="invalid">
+  <meta content="This test verifies how 12 calc() functions are computed for 'opacity' and 'tab-size'." name="assert">
+
+  <script src="/resources/testharness.js"></script>
+
+  <script src="/resources/testharnessreport.js"></script>
+
+  <div id="target"></div>
+
+  <script>
+  function startTesting()
+  {
+
+    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description)
+    {
+
+    var elemTarget = document.getElementById("target");
+
+    test(function()
+      {
+
+      elemTarget.style.setProperty(property_name, initial_value);
+
+      /*
+      In exactly 9 out of the 12 sub-tests, the initial_value will
+      act as a fallback value because the calc() function in the
+      specified value generates an invalid value. Since we are
+      running 12 consecutive tests on the same element, then
+      it is necessary to 'reset' its property to an initial
+      value.
+      */
+
+      elemTarget.style.setProperty(property_name, specified_value);
+
+      assert_equals(getComputedStyle(elemTarget)[property_name], expected_value, specified_value + ' should compute to ' + expected_value);
+
+      }, description);
+    }
+
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
+
+    verifyComputedStyle("tab-size", "initial", "calc(2 * 3)", "6", "testing tab-size: calc(2 * 3)");
+
+    verifyComputedStyle("tab-size", "12345", "calc(2 * -4)", "12345", "testing tab-size: calc(2 * -4)");
+
+    verifyComputedStyle("opacity", "initial", "calc(2 / 4)", "0.5", "testing opacity: calc(2 / 4)");
+
+    verifyComputedStyle("tab-size", "12345", "calc(2 / 4)", "0.5", "testing tab-size: calc(2 / 4)");
+
+    verifyComputedStyle("opacity", "0.9", "calc(2 / 4) * 1px", "0.9", "testing opacity: calc(2 / 4) * 1px");
+
+    verifyComputedStyle("tab-size", "12345", "calc(1 + 1px)", "12345", "testing tab-size: calc(1 + 1px)");
+
+    verifyComputedStyle("tab-size", "12345", "calc(1 + 100%)", "12345", "testing tab-size: calc(1 + 100%)");
+
+    verifyComputedStyle("tab-size", "12345", "calc(100%)", "12345", "testing tab-size: calc(100%)");
+
+    verifyComputedStyle("tab-size", "12345", "calc(10px) bla", "12345", "testing tab-size: calc(10px) bla");
+
+    verifyComputedStyle("tab-size", "12345", "calc(bla) 10px", "12345", "testing tab-size: calc(bla) 10px");
+
+    verifyComputedStyle("tab-size", "initial", "calc(10px)", "10px", "testing tab-size: calc(10px)");
+
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
+  }
+
+  startTesting();
+
+  </script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/CSS.html b/tests/wpt/web-platform-tests/css/cssom/CSS.html
index 7d558f04466..ba048c58aca 100644
--- a/tests/wpt/web-platform-tests/css/cssom/CSS.html
+++ b/tests/wpt/web-platform-tests/css/cssom/CSS.html
@@ -26,6 +26,8 @@
         assert_equals(CSS.supports("color: red"), true, "CSS.supports: Single-argument form allows for declarations without enclosing parentheses");
         assert_equals(CSS.supports("(color: red) and (color: blue)"), true, "CSS.supports: Complex conditions allowed");
         assert_equals(CSS.supports("not (foobar)"), true, "CSS.supports: general_enclosed still parses");
+        assert_equals(CSS.supports("color: something-pointless var(--foo)"), true, "Variable references always parse");
+        assert_equals(CSS.supports("color: something-pointless(var(--foo))"), true, "Variable references in an unknown function always parse");
     }, "CSS.supports, one argument form");
     test(function () {
         // https://drafts.csswg.org/css-conditional/#dom-css-supports
diff --git a/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener-a-form.html b/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener-a-form.html
new file mode 100644
index 00000000000..e1ec760b926
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener-a-form.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<title>opener and embedded documents; using a and form</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<iframe name=matchesastring></iframe>
+<a href=/common/blank.html target=matchesastring>&lt;a></a>
+<form action=/common/blank.html target=matchesastring><input type=submit value="<form>"></form>
+<script>
+async_test(t => {
+  const frame = document.querySelector("iframe");
+  let counter = 0;
+  frame.onload = t.step_func(() => {
+    // Firefox and Chrome/Safari load differently
+    if (frame.contentWindow.location.href === "about:blank") {
+      return;
+    }
+
+    // Test bits
+    assert_equals(frame.contentWindow.opener, null);
+    if (counter === 0) {
+      document.querySelector("input").click();
+    } else {
+      t.done();
+    }
+    counter++;
+  });
+  document.querySelector("a").click();
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener.html b/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener.html
new file mode 100644
index 00000000000..8e02664342f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/browsers/windows/embedded-opener.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<title>opener and embedded documents; using window.open()</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<iframe name=matchesastring></iframe>
+<script>
+async_test(t => {
+  const frame = document.querySelector("iframe");
+  frame.onload = t.step_func(() => {
+    // Firefox and Chrome/Safari load differently
+    if (frame.contentWindow.location.href === "about:blank") {
+      return;
+    }
+
+    // Test bits
+    assert_equals(frame.contentWindow.opener, window, "opener before setting it to null");
+
+    const openerDesc = Object.getOwnPropertyDescriptor(frame.contentWindow, "opener"),
+          openerGet = openerDesc.get;
+
+    assert_equals(openerGet(), window, "opener before setting it to null via directly invoking the getter");
+    frame.contentWindow.opener = null;
+    frame.contentWindow.opener = "immaterial";
+    assert_equals(openerGet(), null, "opener after setting it to null via directly invoking the getter");
+    assert_equals(frame.contentWindow.opener, "immaterial");
+
+    t.done();
+  });
+  window.open("/common/blank.html", "matchesastring");
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html
new file mode 100644
index 00000000000..ea7e496ae8e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-error-events.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link id=link rel=stylesheet id=style_test
+      onload="t.unreached_func('Sheet should fail to load')">
+<script>
+  var t = async_test("Check if the <link>'s error event fires for each style " +
+                     "sheet it fails to load");
+
+  link.onerror = t.step_func(() => {
+    link.onerror = t.step_func_done(() => {});
+    link.href = 'nonexistent.css?second';
+  });
+
+  link.href = 'nonexistent.css?first';
+</script>
+
+</head>
+</html>
diff --git a/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html
new file mode 100644
index 00000000000..24cd5ba7011
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/document-metadata/the-link-element/link-multiple-load-events.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link id=link rel=stylesheet id=style_test
+      onerror="t.unreached_func('Sheet should load successfully')">
+<script>
+  var t = async_test("Check if the <link>'s load event fires for each style " +
+                     "sheet it loads");
+
+  link.onload = t.step_func(() => {
+    link.onload = t.step_func_done(() => {});
+    link.href = 'style.css?second';
+  });
+
+  link.href = 'style.css?first';
+</script>
+
+</head>
+</html>
diff --git a/tests/wpt/web-platform-tests/html/syntax/serializing-html-fragments/serializing.html b/tests/wpt/web-platform-tests/html/syntax/serializing-html-fragments/serializing.html
index 6645b5aabad..1bccbf56088 100644
--- a/tests/wpt/web-platform-tests/html/syntax/serializing-html-fragments/serializing.html
+++ b/tests/wpt/web-platform-tests/html/syntax/serializing-html-fragments/serializing.html
@@ -15,6 +15,7 @@
 <span><a b='"'></a></span>
 <span><a b="<"></a></span>
 <span><a b=">"></a></span>
+<span><a href="javascript:&quot;&lt;>&quot;"></a></span>
 <span><svg xlink:href="a"></svg></span>
 <span><svg xmlns:svg="test"></svg></span>
 <span>a</span>
@@ -49,6 +50,7 @@ var expected = [
 ["<a b=\"&quot;\"></a>", "<span><a b=\"&quot;\"></a></span>"],
 ["<a b=\"<\"></a>", "<span><a b=\"<\"></a></span>"],
 ["<a b=\">\"></a>", "<span><a b=\">\"></a></span>"],
+["<a href=\"javascript:&quot;<>&quot;\"></a>", "<span><a href=\"javascript:&quot;<>&quot;\"></a></span>"],
 ["<svg xlink:href=\"a\"></svg>", "<span><svg xlink:href=\"a\"></svg></span>"],
 ["<svg xmlns:svg=\"test\"></svg>", "<span><svg xmlns:svg=\"test\"></svg></span>"],
 ["a", "<span>a</span>"],
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/allowed-to-play.html.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/allowed-to-play.html.ini
index c9fbabede6d..f9be6a64bdf 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/allowed-to-play.html.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/allowed-to-play.html.ini
@@ -1,8 +1,10 @@
 [allowed-to-play.html]
   expected:
+    if product == "edge_webdriver": TIMEOUT
     if product == "safari": ERROR # https://bugs.webkit.org/show_bug.cgi?id=190775
 
 
   [<audio> autoplay]
     expected:
+      if product == "edge_webdriver": TIMEOUT
       if product == "safari": FAIL # https://bugs.webkit.org/show_bug.cgi?id=190775
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/html-elements.html.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/html-elements.html.ini
index b7303c645fc..5bb1bf554cc 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/html-elements.html.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/assumptions/html-elements.html.ini
@@ -1,4 +1,9 @@
 [html-elements.html]
+  [(pre-req for comparison tests) all CSS short-hand supported]
+    expected:
+      if product == "edge_webdriver": FAIL
+
+
   [Compare CSS span definitions (only valid if pre-reqs pass)]
     expected:
       if product == "safari": FAIL # https://webkit.org/show_bug.cgi?id=187052
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/reftest/size.html.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/reftest/size.html.ini
new file mode 100644
index 00000000000..1c6cd9eff89
--- /dev/null
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/reftest/size.html.ini
@@ -0,0 +1,4 @@
+[size.html]
+  type: reftest
+  expected:
+    if product == "edge_webdriver": FAIL # https://github.com/web-platform-tests/wpt/issues/15159
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/context.any.js.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
index f985548b2f0..ff57a138029 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
@@ -1,4 +1,5 @@
 [context.any.sharedworker.html]
   [context]
     expected:
+      if product == "edge_webdriver": FAIL
       if product == "safari": FAIL # https://bugs.webkit.org/show_bug.cgi?id=149850
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.any.js.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.any.js.ini
index b29646288b2..e4a96de0e8f 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.any.js.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.any.js.ini
@@ -1,4 +1,27 @@
+[order-of-metas.any.worker.html]
+  expected:
+    if product == "edge_webdriver": TIMEOUT
+
+
+[order-of-metas.any.html]
+  [<meta name=timeout> exists]
+    expected:
+      if product == "edge_webdriver": FAIL
+
+
 [order-of-metas.any.sharedworker.html]
+  [foo\n]
+    expected:
+      if product == "edge_webdriver": FAIL
+
+
   [foo]
     expected:
+      if product == "edge_webdriver": FAIL
       if product == "safari": FAIL # https://bugs.webkit.org/show_bug.cgi?id=149850
+
+
+[order-of-metas.window.html]
+  [<meta name=timeout> exists]
+    expected:
+      if product == "edge_webdriver": FAIL
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.window.js.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.window.js.ini
new file mode 100644
index 00000000000..20e4cbad939
--- /dev/null
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/order-of-metas.window.js.ini
@@ -0,0 +1,4 @@
+[order-of-metas.window.html]
+  [<meta name=timeout> exists]
+    expected:
+      if product == "edge_webdriver": FAIL
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/secure-context.https.any.js.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/secure-context.https.any.js.ini
index 272935af1ec..f483bca13f6 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/secure-context.https.any.js.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/secure-context.https.any.js.ini
@@ -1,4 +1,5 @@
 [secure-context.https.any.sharedworker.html]
   [secure-context]
     expected:
+      if product == "edge_webdriver": FAIL
       if product == "safari": FAIL # https://bugs.webkit.org/show_bug.cgi?id=149850
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/title.any.js.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/title.any.js.ini
index 6852b8033d8..cbae6b15410 100644
--- a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/title.any.js.ini
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/server/title.any.js.ini
@@ -1,4 +1,20 @@
+[title.any.html]
+  [foobar\n]
+    expected:
+      if product == "edge_webdriver": FAIL
+
+
 [title.any.sharedworker.html]
+  [foobar\n]
+    expected:
+      if product == "edge_webdriver": FAIL
+
+
   [foobar]
     expected:
       if product == "safari": FAIL # https://bugs.webkit.org/show_bug.cgi?id=149850
+
+
+[title.any.worker.html]
+  expected:
+    if product == "edge_webdriver": TIMEOUT
diff --git a/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini
new file mode 100644
index 00000000000..42c98117c58
--- /dev/null
+++ b/tests/wpt/web-platform-tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini
@@ -0,0 +1,3 @@
+[file_upload.sub.html]
+  expected:
+    if product == "edge_webdriver": ERROR
diff --git a/tests/wpt/web-platform-tests/interfaces/html.idl b/tests/wpt/web-platform-tests/interfaces/html.idl
index 46d0b852f09..0d6445e7f01 100644
--- a/tests/wpt/web-platform-tests/interfaces/html.idl
+++ b/tests/wpt/web-platform-tests/interfaces/html.idl
@@ -1096,8 +1096,8 @@ interface HTMLCanvasElement : HTMLElement {
 
   RenderingContext? getContext(DOMString contextId, optional any options = null);
 
-  USVString toDataURL(optional DOMString type, optional any quality);
-  void toBlob(BlobCallback _callback, optional DOMString type, optional any quality);
+  USVString toDataURL(optional DOMString type = "image/png", optional any quality);
+  void toBlob(BlobCallback _callback, optional DOMString type = "image/png", optional any quality);
   OffscreenCanvas transferControlToOffscreen();
 };
 
@@ -1357,7 +1357,7 @@ typedef (OffscreenCanvasRenderingContext2D or WebGLRenderingContext or WebGL2Ren
 
 dictionary ImageEncodeOptions {
   DOMString type = "image/png";
-  unrestricted double quality = 1.0;
+  unrestricted double quality;
 };
 
 enum OffscreenRenderingContextId { "2d", "webgl", "webgl2" };
diff --git a/tests/wpt/web-platform-tests/interfaces/netinfo.idl b/tests/wpt/web-platform-tests/interfaces/netinfo.idl
index c39293d5c7f..a4876c99910 100644
--- a/tests/wpt/web-platform-tests/interfaces/netinfo.idl
+++ b/tests/wpt/web-platform-tests/interfaces/netinfo.idl
@@ -22,7 +22,6 @@ enum EffectiveConnectionType {
   "slow-2g"
 };
 
-[NoInterfaceObject, Exposed=(Window,Worker)]
 interface mixin NavigatorNetworkInformation {
   readonly attribute NetworkInformation connection;
 };
diff --git a/tests/wpt/web-platform-tests/lint.whitelist b/tests/wpt/web-platform-tests/lint.whitelist
index 8c5a329357d..765256d05ca 100644
--- a/tests/wpt/web-platform-tests/lint.whitelist
+++ b/tests/wpt/web-platform-tests/lint.whitelist
@@ -800,6 +800,4 @@ CSS-COLLIDING-REF-NAME: css/vendor-imports/mozilla/mozilla-central-reftests/cont
 
 # Signed Exchange files have hard-coded URLs in the certUrl field
 WEB-PLATFORM.TEST:signed-exchange/resources/*.sxg
-WEB-PLATFORM.TEST:signed-exchange/resources/generate-test-sxgs.sh
-
-WEB-PLATFORM.TEST: workers/Worker-location.any.js
\ No newline at end of file
+WEB-PLATFORM.TEST:signed-exchange/resources/generate-test-sxgs.sh
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/performance-timeline/po-observe-type.any.js b/tests/wpt/web-platform-tests/performance-timeline/po-observe-type.any.js
new file mode 100644
index 00000000000..5cdac973bec
--- /dev/null
+++ b/tests/wpt/web-platform-tests/performance-timeline/po-observe-type.any.js
@@ -0,0 +1,54 @@
+// META: script=performanceobservers.js
+
+test(() => {
+  const obs = new PerformanceObserver(() =>{});
+  obs.observe({entryTypes: ["mark"]});
+  assert_throws('InvalidModificationError', function () {
+    obs.observe({type: "measure"});
+  });
+}, "Calling observe() with entryTypes and then type should throw an InvalidModificationError");
+
+test(() => {
+  const obs = new PerformanceObserver(() =>{});
+  obs.observe({type: "mark"});
+  assert_throws('InvalidModificationError', function () {
+    obs.observe({entryTypes: ["measure"]});
+  });
+}, "Calling observe() with type and then entryTypes should throw an InvalidModificationError");
+
+test(() => {
+  const obs = new PerformanceObserver(() =>{});
+  assert_throws(new SyntaxError(), function () {
+    obs.observe({type: "mark", entryTypes: ["measure"]});
+  });
+}, "Calling observe() with type and entryTypes should throw a SyntaxError");
+
+test(function () {
+  const obs = new PerformanceObserver(() =>{});
+  // Definitely not an entry type.
+  obs.observe({type: "this-cannot-match-an-entryType"});
+  // Close to an entry type, but not quite.
+  obs.observe({type: "marks"});
+}, "Passing in unknown values to type does throw an exception.");
+
+async_test(function (t) {
+  let observedMark = false;
+  let observedMeasure = false;
+  const observer = new PerformanceObserver(
+    t.step_func(function (entryList, obs) {
+      observedMark |= entryList.getEntries().filter(
+        entry => entry.entryType === 'mark').length;
+      observedMeasure |= entryList.getEntries().filter(
+        entry => entry.entryType === 'measure').length
+      // Only conclude the test once we receive both entries!
+      if (observedMark && observedMeasure) {
+        observer.disconnect();
+        t.done();
+      }
+    })
+  );
+  observer.observe({type: "mark"});
+  observer.observe({type: "measure"});
+  self.performance.mark("mark1");
+  self.performance.measure("measure1");
+}, "observe() with different type values stacks.");
diff --git a/tests/wpt/web-platform-tests/performance-timeline/po-observe.any.js b/tests/wpt/web-platform-tests/performance-timeline/po-observe.any.js
index 8520c26e504..6a673dbe784 100644
--- a/tests/wpt/web-platform-tests/performance-timeline/po-observe.any.js
+++ b/tests/wpt/web-platform-tests/performance-timeline/po-observe.any.js
@@ -2,13 +2,13 @@
 
   test(function () {
     var obs = new PerformanceObserver(function () { return true; });
-    assert_throws(new TypeError(), function () {
+    assert_throws(new SyntaxError(), function () {
       obs.observe({});
     });
-    assert_throws(new TypeError(), function () {
+    assert_throws(new SyntaxError(), function () {
       obs.observe({entryType: []});
     });
-  }, "no entryTypes throws a TypeError");
+  }, "no 'type' or 'entryTypes' throws a SyntaxError");
   test(function () {
     var obs = new PerformanceObserver(function () { return true; });
     assert_throws(new TypeError(), function () {
@@ -19,13 +19,13 @@
   test(function () {
     var obs = new PerformanceObserver(function () { return true; });
     obs.observe({entryTypes: []});
-  }, "Empty sequence entryTypes is a no-op");
+  }, "Empty sequence entryTypes does not throw an exception.");
 
   test(function () {
     var obs = new PerformanceObserver(function () { return true; });
     obs.observe({entryTypes: ["this-cannot-match-an-entryType"]});
     obs.observe({entryTypes: ["marks","navigate", "resources"]});
-  }, "Unknown entryTypes are no-op");
+  }, "Unknown entryTypes do not throw an exception.");
 
   test(function () {
     var obs = new PerformanceObserver(function () { return true; });
diff --git a/tests/wpt/web-platform-tests/portals/portal-activate-event.html b/tests/wpt/web-platform-tests/portals/portal-activate-event.html
index ac1505d2a5b..33d91e37d9d 100644
--- a/tests/wpt/web-platform-tests/portals/portal-activate-event.html
+++ b/tests/wpt/web-platform-tests/portals/portal-activate-event.html
@@ -4,29 +4,35 @@
 <script src="/resources/testharnessreport.js"></script>
 <script>
   async_test(function(t) {
-    var bc = new BroadcastChannel("test-eventlistener");
+    let test = "eventlistener";
+    var bc = new BroadcastChannel(`test-${test}`);
     bc.onmessage = t.step_func_done(function(e) {
       assert_equals(e.data, "passed");
       bc.close();
     });
-    window.open("resources/portal-activate-event-window.html?test=eventlistener");
+    const portalUrl = encodeURIComponent(`portal-activate-event-portal.html?test=${test}`);
+    window.open(`resources/portal-embed-and-activate.html?url=${portalUrl}&channelName=portal-${test}`);
   }, "Tests that the PortalActivateEvent is dispatched when a portal is activated.");
 
   async_test(function(t) {
-    var bc = new BroadcastChannel("test-eventhandler");
+    let test = "eventhandler";
+    var bc = new BroadcastChannel(`test-${test}`);
     bc.onmessage = t.step_func_done(function(e) {
       assert_equals(e.data, "passed");
       bc.close();
     });
-    window.open("resources/portal-activate-event-window.html?test=eventhandler");
+    const portalUrl = encodeURIComponent(`portal-activate-event-portal.html?test=${test}`);
+    window.open(`resources/portal-embed-and-activate.html?url=${portalUrl}&channelName=portal-${test}`);
   }, "Tests that the portalactivate event handler is dispatched when a portal is activated.");
 
   async_test(function(t) {
-    var bc = new BroadcastChannel("test-bodyeventhandler");
+    let test = "bodyeventhandler";
+    var bc = new BroadcastChannel(`test-${test}`);
     bc.onmessage = t.step_func_done(function(e) {
       assert_equals(e.data, "passed");
       bc.close();
     });
-    window.open("resources/portal-activate-event-window.html?test=bodyeventhandler");
+    const portalUrl = encodeURIComponent(`portal-activate-event-portal.html?test=${test}`);
+    window.open(`resources/portal-embed-and-activate.html?url=${portalUrl}&channelName=portal-${test}`);
   }, "Tests that the HTMLBodyElement has the portalactivate event handler.");
 </script>
diff --git a/tests/wpt/web-platform-tests/portals/portals-activate-no-browsing-context.html b/tests/wpt/web-platform-tests/portals/portals-activate-no-browsing-context.html
new file mode 100644
index 00000000000..6eebca9f9d9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portals-activate-no-browsing-context.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(async t => {
+  let activatePromise = document.createElement('portal').activate();
+  await promise_rejects(t, 'InvalidStateError', activatePromise);
+}, "A portal with nothing in it cannot be activated");
+</script>
diff --git a/tests/wpt/web-platform-tests/portals/portals-cross-origin-load.sub.html b/tests/wpt/web-platform-tests/portals/portals-cross-origin-load.sub.html
new file mode 100644
index 00000000000..f860ac54dc9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portals-cross-origin-load.sub.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  promise_test(async () => {
+    var bc = new BroadcastChannel("portals-cross-origin-load");
+    var receiveMessage = new Promise((resolve, reject) => {
+      bc.onmessage = e => {
+        bc.close();
+        resolve();
+      }
+    });
+    var portal = document.createElement("portal");
+    portal.src = "http://{{hosts[alt][www]}}:{{ports[http][0]}}/portals/resources/portal-cross-origin.sub.html";
+    document.body.appendChild(portal);
+    return receiveMessage;
+  });
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/portals-host-exposure.sub.html b/tests/wpt/web-platform-tests/portals/portals-host-exposure.sub.html
new file mode 100644
index 00000000000..83e31bd4735
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portals-host-exposure.sub.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  let channelIndex = 0;
+  async function openPortalAndReceiveMessage(portalSrc) {
+    let channelName = `portals-host-exposure-${channelIndex++}`
+    let broadcastChannel = new BroadcastChannel(channelName);
+    try {
+      let received = new Promise((resolve, reject) => {
+        broadcastChannel.addEventListener('message', e => {
+          resolve(e.data);
+        }, {once: true})
+      });
+      let portal = document.createElement('portal');
+      portal.src = `${portalSrc}?broadcastchannel=${channelName}`;
+      document.body.appendChild(portal);
+      return await received;
+    } finally {
+      broadcastChannel.close();
+    }
+  }
+
+  promise_test(async t => {
+    let {hasHost} = await openPortalAndReceiveMessage(
+        'resources/portal-host.html');
+    assert_true(hasHost, "window.portalHost should be defined");
+  }, "window.portalHost should be exposed in same-origin portal");
+
+  promise_test(async t => {
+    let {hasHost} = await openPortalAndReceiveMessage(
+        'http://{{hosts[alt][www]}}:{{ports[http][0]}}/portals/resources/portal-host-cross-origin.sub.html');
+    assert_true(hasHost, "window.portalHost should be defined");
+  }, "window.portalHost should be exposed in cross-origin portal");
+
+  promise_test(async t => {
+    let {hasHost} = await openPortalAndReceiveMessage(
+        'resources/portal-host-cross-origin-navigate.sub.html');
+    assert_true(hasHost, "window.portalHost should be defined");
+  }, "window.portalHost should be exposed in portal after cross-origin navigation");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/portals-host-hidden-after-activation.html b/tests/wpt/web-platform-tests/portals/portals-host-hidden-after-activation.html
new file mode 100644
index 00000000000..f51e54bd49c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/portals-host-hidden-after-activation.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  // Waits for 2 messages from portal, one before activation and one after.
+  function waitForMessages() {
+    return new Promise((resolve, reject) => {
+      var results = [];
+      var bc = new BroadcastChannel("portals-host-hidden-after-activation");
+      bc.onmessage = e => {
+        results.push(e.data.hasHost);
+        if (results.length == 2) {
+          bc.close();
+          resolve(results);
+        }
+      };
+    });
+  }
+
+  promise_test(async () => {
+    const portalUrl = encodeURIComponent("portal-host-hidden-after-activation-portal.html");
+    window.open(`resources/portal-embed-and-activate.html?url=${portalUrl}`);
+    var results = await waitForMessages();
+    assert_true(results[0], "portalHost exposed before calling activate()");
+    assert_false(results[1], "portalHost hidden after receiving portalactivate event");
+  }, "window.portalHost should be null after portal is activated");
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-activate-event-window.html b/tests/wpt/web-platform-tests/portals/resources/portal-activate-event-window.html
deleted file mode 100644
index cf09caebc0f..00000000000
--- a/tests/wpt/web-platform-tests/portals/resources/portal-activate-event-window.html
+++ /dev/null
@@ -1,17 +0,0 @@
-<!DOCTYPE html>
-<script>
-  window.onload = function(e) {
-    var test = (new URL(location)).searchParams.get("test");
-    var portal = document.createElement("portal");
-    portal.src = "portal-activate-event-portal.html" + location.search;
-    document.body.appendChild(portal);
-
-    var bc = new BroadcastChannel("portal-" + test);
-    bc.onmessage = function(e) {
-      document.querySelector("portal").activate();
-      bc.close();
-    }
-  }
-</script>
-<body>
-</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-cross-origin.sub.html b/tests/wpt/web-platform-tests/portals/resources/portal-cross-origin.sub.html
new file mode 100644
index 00000000000..145ab5a2d21
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-cross-origin.sub.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    var iframe = document.createElement("iframe");
+    iframe.src = "http://{{host}}:{{ports[http][0]}}/portals/resources/portal-forward-with-broadcast.html?broadcastchannel=portals-cross-origin-load";
+    iframe.onload = e => {
+      iframe.contentWindow.postMessage("loaded", "*");
+    }
+    document.body.appendChild(iframe);
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-embed-and-activate.html b/tests/wpt/web-platform-tests/portals/resources/portal-embed-and-activate.html
new file mode 100644
index 00000000000..6b77a2bfcc3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-embed-and-activate.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<!--
+  Embeds a portal (src specified by query parameter "url") and activates it after
+  receiving a message from the portal. Use query parameter "channelName" to
+  specify the name of the channel used by the portal src send a message
+  indicating that it is ready for activation (default name used is "portal").
+-->
+</title>
+<body>
+  <script>
+    var searchParams = new URL(location).searchParams;
+
+    // TODO(adithyas): Replace this with postmessage once it's implemented for
+    // portals.
+    var channelName = searchParams.get("channelName") || "portal";
+    var bc = new BroadcastChannel(channelName);
+    bc.onmessage = function(e) {
+      document.querySelector("portal").activate();
+      bc.close();
+    }
+
+    let portal = document.createElement("portal");
+    portal.src = searchParams.get("url");
+    document.body.appendChild(portal);
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-forward-with-broadcast.html b/tests/wpt/web-platform-tests/portals/resources/portal-forward-with-broadcast.html
new file mode 100644
index 00000000000..39bda69b0ee
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-forward-with-broadcast.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    function forwardMessage(e) {
+      let broadcastChannel = new BroadcastChannel(new URL(location).searchParams.get('broadcastchannel'));
+      try {
+        broadcastChannel.postMessage(e.data);
+      } finally {
+        broadcastChannel.close();
+      }
+    }
+    window.addEventListener("message", forwardMessage);
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin-navigate.sub.html b/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin-navigate.sub.html
new file mode 100644
index 00000000000..44c6c16c577
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin-navigate.sub.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    let channelName = new URL(location).searchParams.get('broadcastchannel');
+    window.location.href = `http://{{hosts[alt][www]}}:{{ports[http][0]}}/portals/resources/portal-host-cross-origin.sub.html?broadcastchannel=${channelName}`;
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin.sub.html b/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin.sub.html
new file mode 100644
index 00000000000..dc4e9e7b5de
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-host-cross-origin.sub.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    let forwardingIframe = document.createElement('iframe');
+    let channelName = new URL(location).searchParams.get('broadcastchannel');
+    forwardingIframe.src = `http://{{host}}:{{ports[http][0]}}/portals/resources/portal-forward-with-broadcast.html?broadcastchannel=${channelName}`;
+    forwardingIframe.onload = () => {
+      let message = {
+        hasHost: !!window.portalHost
+      };
+      forwardingIframe.contentWindow.postMessage(message, '*');
+    }
+    document.body.appendChild(forwardingIframe);
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-host-hidden-after-activation-portal.html b/tests/wpt/web-platform-tests/portals/resources/portal-host-hidden-after-activation-portal.html
new file mode 100644
index 00000000000..586929e31d0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-host-hidden-after-activation-portal.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script>
+  window.addEventListener("portalactivate", function(e) {
+    var bc = new BroadcastChannel("portals-host-hidden-after-activation");
+    bc.postMessage({ hasHost: !!window.portalHost });
+    bc.close();
+  });
+
+  var bc = new BroadcastChannel("portals-host-hidden-after-activation");
+  bc.postMessage({hasHost: !!window.portalHost });
+  bc.close();
+
+  bc = new BroadcastChannel("portal");
+  bc.postMessage("loaded");
+  bc.close();
+
+</script>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-host.html b/tests/wpt/web-platform-tests/portals/resources/portal-host.html
new file mode 100644
index 00000000000..5043a158ea7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-host.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<body>
+  <script>
+    let message = {
+      hasHost: !!window.portalHost
+    };
+    let broadcastChannel = new BroadcastChannel(new URL(location).searchParams.get('broadcastchannel'));
+    try {
+      broadcastChannel.postMessage(message);
+    } finally {
+      broadcastChannel.close();
+    }
+  </script>
+</body>
diff --git a/tests/wpt/web-platform-tests/resources/idlharness.js b/tests/wpt/web-platform-tests/resources/idlharness.js
index 8b7a1e2d98e..b765d1f6199 100644
--- a/tests/wpt/web-platform-tests/resources/idlharness.js
+++ b/tests/wpt/web-platform-tests/resources/idlharness.js
@@ -2309,7 +2309,7 @@ IdlInterface.prototype.do_member_operation_asserts = function(memberHolderObject
     }
 }
 
-IdlInterface.prototype.test_to_json_operation = function(memberHolderObject, member) {
+IdlInterface.prototype.test_to_json_operation = function(desc, memberHolderObject, member) {
     var instanceName = memberHolderObject && memberHolderObject.constructor.name
         || member.name + " object";
     if (member.has_extended_attribute("Default")) {
@@ -2325,12 +2325,12 @@ IdlInterface.prototype.test_to_json_operation = function(memberHolderObject, mem
                 this.array.assert_type_is(json[k], type);
                 delete json[k];
             }, this);
-        }.bind(this), "Test default toJSON operation of " + instanceName);
+        }.bind(this), this.name + " interface: default toJSON operation on " + desc);
     } else {
         subsetTestByKey(this.name, test, function() {
             assert_true(this.array.is_json_type(member.idlType), JSON.stringify(member.idlType) + " is not an appropriate return value for the toJSON operation of " + instanceName);
             this.array.assert_type_is(memberHolderObject.toJSON(), member.idlType);
-        }.bind(this), "Test toJSON operation of " + instanceName);
+        }.bind(this), this.name + " interface: toJSON operation on " + desc);
     }
 };
 
@@ -2722,7 +2722,7 @@ IdlInterface.prototype.test_interface_of = function(desc, obj, exception, expect
         }
 
         if (member.is_to_json_regular_operation()) {
-            this.test_to_json_operation(obj, member);
+            this.test_to_json_operation(desc, obj, member);
         }
     }
 };
diff --git a/tests/wpt/web-platform-tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html b/tests/wpt/web-platform-tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html
index ba8cd78abb9..fd857cda009 100644
--- a/tests/wpt/web-platform-tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html
+++ b/tests/wpt/web-platform-tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html
@@ -29,19 +29,19 @@
 
     var i, obj;
     i = interfaceFrom("interface A { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, { foo: 123 }), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, { foo: 123 }), i.members[0]);
 
     // should fail (wrong type)
     i = interfaceFrom("interface B { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, { foo: "a value" }), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, { foo: "a value" }), i.members[0]);
 
     // should handle extraneous attributes (e.g. from an extension specification)
     i = interfaceFrom("interface C { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, { foo: 123, bar: 456 }), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, { foo: 123, bar: 456 }), i.members[0]);
 
     // should fail (missing property)
     i = interfaceFrom("interface D { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, { }), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, { }), i.members[0]);
 
     // should fail (should be writable)
     obj = Object.defineProperties({}, { foo: {
@@ -51,7 +51,7 @@
         value: 123
     }});
     i = interfaceFrom("interface F { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, obj), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
 
     // should fail (should be enumerable)
     obj = Object.defineProperties({}, { foo: {
@@ -61,7 +61,7 @@
         value: 123
     }});
     i = interfaceFrom("interface G { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, obj), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
 
     // should fail (should be configurable)
     obj = Object.defineProperties({}, { foo: {
@@ -71,27 +71,27 @@
         value: 123
     }});
     i = interfaceFrom("interface H { [Default] object toJSON(); attribute long foo; };");
-    i.test_to_json_operation(wrap(i, obj), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
 
     var idl = new IdlArray();
     idl.add_idls("interface I : J { [Default] object toJSON(); attribute long foo; };");
     idl.add_idls("interface J { [Default] object toJSON(); attribute DOMString foo;};");
     var i = idl.members.I;
-    i.test_to_json_operation(wrap(i, { foo: 123 }), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, { foo: 123 }), i.members[0]);
 
     i = interfaceFrom("interface K { [Default] object toJSON(); };");
-    i.test_to_json_operation(wrap(i, {}), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
 
     i = interfaceFrom("interface L { DOMString toJSON(); };");
-    i.test_to_json_operation(wrap(i, "a string"), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, "a string"), i.members[0]);
 
     // should fail (wrong output type)
     i = interfaceFrom("interface M { DOMString toJSON(); };");
-    i.test_to_json_operation(wrap(i, {}), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
 
     // should fail (not an IDL type)
     i = interfaceFrom("interface N { DOMException toJSON(); };");
-    i.test_to_json_operation(wrap(i, {}), i.members[0]);
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
 </script>
 <script type="text/json" id="expected">
     {
@@ -102,73 +102,73 @@
         "summarized_tests": [
             {
                 "message": null,
-                "name": "Test default toJSON operation of A",
+                "name": "A interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "PASS"
             },
             {
                 "message": "assert_equals: expected \"number\" but got \"string\"",
-                "name": "Test default toJSON operation of B",
+                "name": "B interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": null,
-                "name": "Test default toJSON operation of C",
+                "name": "C interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "PASS"
             },
             {
                 "message": "assert_true: property \"foo\" should be present in the output of D.prototype.toJSON() expected true got false",
-                "name": "Test default toJSON operation of D",
+                "name": "D interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": "assert_true: property foo should be writable expected true got false",
-                "name": "Test default toJSON operation of F",
+                "name": "F interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": "assert_true: property foo should be enumerable expected true got false",
-                "name": "Test default toJSON operation of G",
+                "name": "G interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": "assert_true: property foo should be configurable expected true got false",
-                "name": "Test default toJSON operation of H",
+                "name": "H interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": null,
-                "name": "Test default toJSON operation of I",
+                "name": "I interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "PASS"
             },
             {
                 "message": null,
-                "name": "Test default toJSON operation of K",
+                "name": "K interface: default toJSON operation on object",
                 "properties": {},
                 "status_string": "PASS"
             },
             {
                 "message": null,
-                "name": "Test toJSON operation of L",
+                "name": "L interface: toJSON operation on object",
                 "properties": {},
                 "status_string": "PASS"
             },
             {
                 "message": "assert_equals: expected \"string\" but got \"object\"",
-                "name": "Test toJSON operation of M",
+                "name": "M interface: toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             },
             {
                 "message": "assert_true: {\"type\":\"return-type\",\"generic\":null,\"nullable\":false,\"union\":false,\"idlType\":\"DOMException\",\"extAttrs\":[]} is not an appropriate return value for the toJSON operation of N expected true got false",
-                "name": "Test toJSON operation of N",
+                "name": "N interface: toJSON operation on object",
                 "properties": {},
                 "status_string": "FAIL"
             }
diff --git a/tests/wpt/web-platform-tests/screen-capture/getdisplaymedia.https.html b/tests/wpt/web-platform-tests/screen-capture/getdisplaymedia.https.html
index e52e596d6fb..7427e3433d0 100644
--- a/tests/wpt/web-platform-tests/screen-capture/getdisplaymedia.https.html
+++ b/tests/wpt/web-platform-tests/screen-capture/getdisplaymedia.https.html
@@ -35,6 +35,8 @@ const j = obj => JSON.stringify(obj);
  {video: {height: {exact: 240}}},
  {video: {frameRate: {min: 4}}},
  {video: {frameRate: {exact: 4}}},
+ {audio: true},
+ {video: false, audio: true},
 ].forEach(constraints => promise_test(async t => {
   try {
     stopTracks(await navigator.mediaDevices.getDisplayMedia(constraints));
@@ -47,7 +49,6 @@ const j = obj => JSON.stringify(obj);
 
 [
  {video: true, audio: true},
- {audio: true},
 ].forEach(constraints => promise_test(async t => {
   const stream = await navigator.mediaDevices.getDisplayMedia(constraints);
   t.add_cleanup(() => stopTracks(stream));
diff --git a/tests/wpt/web-platform-tests/service-workers/cache-storage/script-tests/cache-match.js b/tests/wpt/web-platform-tests/service-workers/cache-storage/script-tests/cache-match.js
index ba359fed142..b2b731cc654 100644
--- a/tests/wpt/web-platform-tests/service-workers/cache-storage/script-tests/cache-match.js
+++ b/tests/wpt/web-platform-tests/service-workers/cache-storage/script-tests/cache-match.js
@@ -144,6 +144,25 @@ cache_test(function(cache) {
         });
   }, 'Cache.match supports ignoreVary');
 
+cache_test(function(cache) {
+    let has_cache_name = false;
+    const opts = {
+      get cacheName() {
+        has_cache_name = true;
+        return undefined;
+      }
+    };
+    return self.caches.open('foo')
+      .then(function() {
+          return cache.match('bar', opts);
+        })
+      .then(function() {
+          assert_false(has_cache_name,
+                       'Cache.match does not support cacheName option ' +
+                       'which was removed in CacheQueryOptions.');
+        });
+  }, 'Cache.match does not support cacheName option');
+
 prepopulated_cache_test(simple_entries, function(cache, entries) {
     return cache.match(entries.cat.request.url + '#mouse')
       .then(function(result) {
diff --git a/tests/wpt/web-platform-tests/streams/writable-streams/aborting.any.js b/tests/wpt/web-platform-tests/streams/writable-streams/aborting.any.js
index 18fb58edf6d..ea47a55fa9f 100644
--- a/tests/wpt/web-platform-tests/streams/writable-streams/aborting.any.js
+++ b/tests/wpt/web-platform-tests/streams/writable-streams/aborting.any.js
@@ -1368,3 +1368,10 @@ promise_test(t => {
                               e => assert_equals(e, 'string argument', 'e should be \'string argument\''));
   });
 }, 'abort with a string argument should set the stored error to that argument');
+
+promise_test(t => {
+  const ws = new WritableStream();
+  const writer = ws.getWriter();
+  return promise_rejects(t, new TypeError(), ws.abort(), 'abort should reject')
+    .then(() => writer.ready);
+}, 'abort on a locked stream should reject');
diff --git a/tests/wpt/web-platform-tests/streams/writable-streams/general.any.js b/tests/wpt/web-platform-tests/streams/writable-streams/general.any.js
index 253909f27b4..96670448a9d 100644
--- a/tests/wpt/web-platform-tests/streams/writable-streams/general.any.js
+++ b/tests/wpt/web-platform-tests/streams/writable-streams/general.any.js
@@ -268,3 +268,10 @@ test(() => {
   assert_true(sub.extraFunction(),
               'extraFunction() should be present on Subclass object');
 }, 'Subclassing WritableStream should work');
+
+test(() => {
+  const ws = new WritableStream();
+  assert_false(ws.locked, 'stream should not be locked');
+  ws.getWriter();
+  assert_true(ws.locked, 'stream should be locked');
+}, 'the locked getter should return true if the stream has a writer');
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml b/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml
new file mode 100644
index 00000000000..ba08b7eafab
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/cleanup_win10.yml
@@ -0,0 +1,13 @@
+# This is cleanup for update_hosts.yml and killing all Edge and WebDriver
+# processes to leave the agent in a clean state for the next job. This is
+# necessary because the Windows 10 agents aren't reset between each job.
+steps:
+- powershell: |
+    $hostFile = "$env:systemroot\System32\drivers\etc\hosts"
+    Copy-Item -Path "$hostFile.back" -Destination $hostFile -Force
+    taskkill /f /im MicrosoftEdge*
+    taskkill /f /im MicrosoftWebDriver.exe
+  displayName: 'Restore hosts file and cleanup test machine'
+  condition: always()
+  errorActionPreference: silentlyContinue
+  ignoreLASTEXITCODE: true
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/install_certs.yml b/tests/wpt/web-platform-tests/tools/ci/azure/install_certs.yml
index a13a5fb39b4..5682199b387 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/install_certs.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/install_certs.yml
@@ -2,4 +2,8 @@ steps:
 - script: |
     # https://github.com/web-platform-tests/results-collection/blob/master/src/scripts/trust-root-ca.sh
     sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain tools/certs/cacert.pem
-  displayName: 'Install web-platform.test certificate'
+  displayName: 'Install web-platform.test certificate (macOS)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Darwin'))
+- script: certutil –addstore -enterprise –f "Root" tools\certs\cacert.pem
+  displayName: 'Install web-platform.test certificate (Windows)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/install_python.yml b/tests/wpt/web-platform-tests/tools/ci/azure/install_python.yml
new file mode 100644
index 00000000000..6585239bc8c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/install_python.yml
@@ -0,0 +1,15 @@
+steps:
+- powershell: |
+    Start-BitsTransfer -Source https://www.python.org/ftp/python/2.7.15/python-2.7.15.amd64.msi -Destination python.msi
+    $hash = (Get-FileHash python.msi).Hash.ToLower()
+    $expectedHash = "5e85f3c4c209de98480acbf2ba2e71a907fd5567a838ad4b6748c76deb286ad7"
+    if ($hash.Equals($expectedHash)) {
+      Write-Host "python.msi hash verified"
+    } else {
+      Throw "python.msi hash mismatch, got $hash, expected $expectedHash"
+    }
+    msiexec /i python.msi TARGETDIR=C:\Python27 /q
+    Write-Host "##vso[task.prependpath]C:\Python27"
+    Write-Host "##vso[task.prependpath]C:\Python27\Scripts"
+  displayName: 'Install Python (Windows)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/pip_install.yml b/tests/wpt/web-platform-tests/tools/ci/azure/pip_install.yml
index 4e486304004..6220abcbde5 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/pip_install.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/pip_install.yml
@@ -9,4 +9,11 @@ steps:
     # Integrity Protection, see https://stackoverflow.com/a/33004920.
     pip install --user ${{ parameters.packages }}
     echo "##vso[task.prependpath]$HOME/Library/Python/2.7/bin"
-  displayName: 'Install Python packages'
+  displayName: 'Install Python packages (macOS)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Darwin'))
+  # TODO(foolip): remove --no-cache-dir when the Windows agents are reset
+  # between each job. Currently, jobs can otherwise fail with "Cache entry
+  # deserialization failed, entry ignored".
+- powershell: pip --no-cache-dir --disable-pip-version-check install --upgrade ${{ parameters.packages }}
+  displayName: 'Install Python packages (Windows)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/system_info.yml b/tests/wpt/web-platform-tests/tools/ci/azure/system_info.yml
new file mode 100644
index 00000000000..cc37b35b853
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/system_info.yml
@@ -0,0 +1,4 @@
+steps:
+- script: systeminfo
+  displayName: 'Show system info (Windows)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/update_hosts.yml b/tests/wpt/web-platform-tests/tools/ci/azure/update_hosts.yml
index 48c04417b02..63c7e458112 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/update_hosts.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/update_hosts.yml
@@ -1,3 +1,10 @@
 steps:
 - script: ./wpt make-hosts-file | sudo tee -a /etc/hosts
-  displayName: 'Update /etc/hosts'
+  displayName: 'Update hosts (macOS)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Darwin'))
+- powershell: |
+    $hostFile = "$env:systemroot\System32\drivers\etc\hosts"
+    Copy-Item -Path $hostFile -Destination "$hostFile.back" -Force
+    python wpt make-hosts-file | Out-File $env:systemroot\System32\drivers\etc\hosts -Encoding ascii -Append
+  displayName: 'Update hosts (Windows)'
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/update_manifest.yml b/tests/wpt/web-platform-tests/tools/ci/azure/update_manifest.yml
index 9f2c1fc5333..453ac2ac3c0 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/update_manifest.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/update_manifest.yml
@@ -1,3 +1,4 @@
 steps:
-- script: ./wpt manifest
+# `python wpt` instead of `./wpt` is to make this work on Windows:
+- script: python wpt manifest
   displayName: 'Update manifest'
diff --git a/tests/wpt/web-platform-tests/tools/wpt/browser.py b/tests/wpt/web-platform-tests/tools/wpt/browser.py
index ea8cc04f7d4..4878663091a 100644
--- a/tests/wpt/web-platform-tests/tools/wpt/browser.py
+++ b/tests/wpt/web-platform-tests/tools/wpt/browser.py
@@ -579,8 +579,12 @@ class Edge(Browser):
         raise NotImplementedError
 
     def version(self, binary=None, webdriver_binary=None):
-        return None
-
+        command = "(Get-AppxPackage Microsoft.MicrosoftEdge).Version"
+        try:
+            return call("powershell.exe", command).strip()
+        except (subprocess.CalledProcessError, OSError):
+            self.logger.warning("Failed to call %s in PowerShell", command)
+            return None
 
 class EdgeWebDriver(Edge):
     product = "edge_webdriver"
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/broadcastchannel-success-and-failure.html b/tests/wpt/web-platform-tests/wasm/serialization/module/broadcastchannel-success-and-failure.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/broadcastchannel-success-and-failure.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/broadcastchannel-success-and-failure.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/broadcastchannel-success.html b/tests/wpt/web-platform-tests/wasm/serialization/module/broadcastchannel-success.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/broadcastchannel-success.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/broadcastchannel-success.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/identity-not-preserved.html b/tests/wpt/web-platform-tests/wasm/serialization/module/identity-not-preserved.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/identity-not-preserved.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/identity-not-preserved.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/incrementer.wasm b/tests/wpt/web-platform-tests/wasm/serialization/module/incrementer.wasm
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/incrementer.wasm
rename to tests/wpt/web-platform-tests/wasm/serialization/module/incrementer.wasm
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/nested-worker-success.any.js b/tests/wpt/web-platform-tests/wasm/serialization/module/nested-worker-success.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/nested-worker-success.any.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/nested-worker-success.any.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/no-transferring.html b/tests/wpt/web-platform-tests/wasm/serialization/module/no-transferring.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/no-transferring.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/no-transferring.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/blank.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/blank.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/blank.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/blank.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-iframe.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-iframe.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-iframe.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-iframe.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-sharedworker.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-sharedworker.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-sharedworker.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-sharedworker.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-worker.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-worker.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/broadcastchannel-worker.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/broadcastchannel-worker.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/create-empty-wasm-module.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/create-empty-wasm-module.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/create-empty-wasm-module.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/create-empty-wasm-module.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/echo-iframe.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/echo-iframe.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/echo-iframe.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/echo-iframe.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/echo-worker.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/echo-worker.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/echo-worker.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/echo-worker.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-iframe-domain.sub.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-iframe-domain.sub.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-iframe-domain.sub.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-iframe-domain.sub.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-iframe.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-iframe.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-iframe.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-iframe.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-popup.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-popup.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-popup.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-popup.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-worker-with-channel.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-worker-with-channel.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-worker-with-channel.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-worker-with-channel.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-worker.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-worker.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer-worker.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer-worker.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer.wasm b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer.wasm
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/incrementer.wasm
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/incrementer.wasm
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-1.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-1.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-1.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-1.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-2.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-2.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-2.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-2.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-3.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-3.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-3.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-3.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-4-incrementer.html b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-4-incrementer.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/nested-iframe-4-incrementer.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/nested-iframe-4-incrementer.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/serviceworker-failure.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/serviceworker-failure.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/serviceworker-failure.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/serviceworker-failure.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/sharedworker-failure.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/sharedworker-failure.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/sharedworker-failure.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/sharedworker-failure.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/resources/test-incrementer.js b/tests/wpt/web-platform-tests/wasm/serialization/module/resources/test-incrementer.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/resources/test-incrementer.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/resources/test-incrementer.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/serialization-via-history.html b/tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-history.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/serialization-via-history.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-history.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/serialization-via-idb.any.js b/tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-idb.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/serialization-via-idb.any.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-idb.any.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/serialization-via-notifications-api.any.js b/tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-notifications-api.any.js
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/serialization-via-notifications-api.any.js
rename to tests/wpt/web-platform-tests/wasm/serialization/module/serialization-via-notifications-api.any.js
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-domain-success.sub.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-domain-success.sub.html
similarity index 93%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-domain-success.sub.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-domain-success.sub.html
index 51d4c5cb0ea..07360d8264d 100644
--- a/tests/wpt/web-platform-tests/wasm/serialization/window-domain-success.sub.html
+++ b/tests/wpt/web-platform-tests/wasm/serialization/module/window-domain-success.sub.html
@@ -18,7 +18,7 @@ promise_test(t => {
     iframe.onload = t.step_func(() => {
       resolve(testSharingViaIncrementerScript(t, window, "window", iframe.contentWindow, "iframe", "*"));
     });
-    iframe.src = "//{{domains[www1]}}:{{location[port]}}/wasm/serialization/resources/incrementer-iframe-domain.sub.html";
+    iframe.src = "//{{domains[www1]}}:{{location[port]}}/wasm/serialization/module/resources/incrementer-iframe-domain.sub.html";
     document.body.appendChild(iframe);
   });
 }, "postMessaging to a same-origin-domain (but not same-origin) iframe allows them to instantiate");
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-messagechannel-success.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-messagechannel-success.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-messagechannel-success.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-messagechannel-success.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-serviceworker-failure.https.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-serviceworker-failure.https.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-serviceworker-failure.https.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-serviceworker-failure.https.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-sharedworker-failure.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-sharedworker-failure.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-sharedworker-failure.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-sharedworker-failure.html
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-similar-but-cross-origin-success.sub.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html
similarity index 94%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-similar-but-cross-origin-success.sub.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html
index 070cf0a49a8..a615547de09 100644
--- a/tests/wpt/web-platform-tests/wasm/serialization/window-similar-but-cross-origin-success.sub.html
+++ b/tests/wpt/web-platform-tests/wasm/serialization/module/window-similar-but-cross-origin-success.sub.html
@@ -18,7 +18,7 @@ promise_test(t => {
     iframe.onload = t.step_func(() => {
       resolve(testSharingViaIncrementerScript(t, window, "window", iframe.contentWindow, "iframe", "*"));
     });
-    iframe.src = "//{{domains[www1]}}:{{location[port]}}/wasm/serialization/resources/incrementer-iframe.html";
+    iframe.src = "//{{domains[www1]}}:{{location[port]}}/wasm/serialization/module/resources/incrementer-iframe.html";
     document.body.appendChild(iframe);
   });
 }, "postMessaging to a not same-origin-domain, but similar origin, iframe allows them to instantiate");
diff --git a/tests/wpt/web-platform-tests/wasm/serialization/window-simple-success.html b/tests/wpt/web-platform-tests/wasm/serialization/module/window-simple-success.html
similarity index 100%
rename from tests/wpt/web-platform-tests/wasm/serialization/window-simple-success.html
rename to tests/wpt/web-platform-tests/wasm/serialization/module/window-simple-success.html
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCIceCandidate-constructor.html b/tests/wpt/web-platform-tests/webrtc/RTCIceCandidate-constructor.html
index cad0464a3c0..344007ded2b 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCIceCandidate-constructor.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCIceCandidate-constructor.html
@@ -6,6 +6,7 @@
   'use strict';
 
   const candidateString = 'candidate:1905690388 1 udp 2113937151 192.168.0.1 58041 typ host generation 0 ufrag thC8 network-cost 50';
+  const candidateString2 = 'candidate:435653019 2 tcp 1845501695 192.168.0.196 4444 typ srflx raddr www.example.com rport 22222 tcptype active';
   const arbitraryString = '<arbitrary string[0] content>;';
 
   test(t => {
@@ -162,8 +163,45 @@
     assert_equals(candidate.sdpMid, 'video', 'sdpMid');
     assert_equals(candidate.sdpMLineIndex, 1, 'sdpMLineIndex');
     assert_equals(candidate.usernameFragment, 'test', 'usernameFragment');
-  }, 'new RTCIceCandidate({ ... }) with non default value for all fields');
 
+    // The following fields should match those in the candidate field
+    assert_equals(candidate.foundation, '1905690388', 'foundation');
+    assert_equals(candidate.component, 'rtp', 'component');
+    assert_equals(candidate.priority, 2113937151, 'priority');
+    assert_equals(candidate.address, '192.168.0.1', 'address');
+    assert_equals(candidate.protocol, 'udp', 'protocol');
+    assert_equals(candidate.port, 58041, 'port');
+    assert_equals(candidate.type, 'host', 'type');
+    assert_equals(candidate.tcpType, '', 'tcpType');
+    assert_equals(candidate.relatedAddress, null, 'relatedAddress');
+    assert_equals(candidate.relatedPort, null, 'relatedPort');
+  }, 'new RTCIceCandidate({ ... }) with nondefault values for all fields');
+
+  test(t => {
+    const candidate = new RTCIceCandidate({
+      candidate: candidateString2,
+      sdpMid: 'video',
+      sdpMLineIndex: 1,
+      usernameFragment: 'user1'
+    });
+
+    assert_equals(candidate.candidate, candidateString2, 'candidate');
+    assert_equals(candidate.sdpMid, 'video', 'sdpMid');
+    assert_equals(candidate.sdpMLineIndex, 1, 'sdpMLineIndex');
+    assert_equals(candidate.usernameFragment, 'user1', 'usernameFragment');
+
+    // The following fields should match those in the candidate field
+    assert_equals(candidate.foundation, '435653019', 'foundation');
+    assert_equals(candidate.component, 'rtcp', 'component');
+    assert_equals(candidate.priority, 1845501695, 'priority');
+    assert_equals(candidate.address, '192.168.0.196', 'address');
+    assert_equals(candidate.protocol, 'tcp', 'protocol');
+    assert_equals(candidate.port, 4444, 'port');
+    assert_equals(candidate.type, 'srflx', 'type');
+    assert_equals(candidate.tcpType, 'active', 'tcpType');
+    assert_equals(candidate.relatedAddress, 'www.example.com', 'relatedAddress');
+    assert_equals(candidate.relatedPort, 22222, 'relatedPort');
+  }, 'new RTCIceCandidate({ ... }) with nondefault values for all fields, tcp candidate');
 
   test(t => {
     // sdpMid is not validated in RTCIceCandidate
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCRtpParameters-encodings.html b/tests/wpt/web-platform-tests/webrtc/RTCRtpParameters-encodings.html
index b8ae4e4c187..23cb76919c0 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCRtpParameters-encodings.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCRtpParameters-encodings.html
@@ -253,7 +253,7 @@
     const encoding = getFirstEncoding(param);
 
     encoding.scaleResolutionDownBy = 0.5;
-    return promise_rejects(t, 'RangeError',
+    return promise_rejects(t, new RangeError(),
       sender.setParameters(param));
   }, `setParameters() with encoding.scaleResolutionDownBy field set to less than 1.0 should reject with RangeError`);
 
diff --git a/tests/wpt/web-platform-tests/workers/Worker-location.any.js b/tests/wpt/web-platform-tests/workers/Worker-location.any.js
deleted file mode 100644
index c2a4590b75a..00000000000
--- a/tests/wpt/web-platform-tests/workers/Worker-location.any.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// META: global=!default, dedicatedworker, sharedworker
-test(() => {
-  assert_equals(String(WorkerLocation), "function WorkerLocation() { [native code] }");
-  assert_true(location instanceof Object);
-  assert_equals(location.href, "http://web-platform.test:8001/workers/Worker-location.any.worker.js")
-  assert_equals(location.origin, "http://web-platform.test:8001");
-  assert_equals(location.protocol, "http:");
-  assert_equals(location.host, "web-platform.test:8001");
-  assert_equals(location.hostname, "web-platform.test");
-  assert_equals(location.port, "8001");
-  assert_equals(location.pathname, "/workers/Worker-location.any.worker.js");
-  assert_equals(location.search, "");
-  assert_equals(location.hash, "");
-}, 'Test WorkerLocation properties.');
diff --git a/tests/wpt/web-platform-tests/workers/Worker-location.sub.any.js b/tests/wpt/web-platform-tests/workers/Worker-location.sub.any.js
new file mode 100644
index 00000000000..2ef94455310
--- /dev/null
+++ b/tests/wpt/web-platform-tests/workers/Worker-location.sub.any.js
@@ -0,0 +1,14 @@
+// META: global=!default, dedicatedworker, sharedworker
+test(() => {
+  assert_equals(String(WorkerLocation), "function WorkerLocation() { [native code] }");
+  assert_true(location instanceof Object);
+  assert_equals(location.href, 'http://{{host}}:{{ports[http][0]}}/workers/Worker-location.sub.any.worker.js');
+  assert_equals(location.origin, "http://{{host}}:{{ports[http][0]}}");
+  assert_equals(location.protocol, "http:");
+  assert_equals(location.host, "{{host}}:{{ports[http][0]}}");
+  assert_equals(location.hostname, "{{host}}");
+  assert_equals(location.port, "{{ports[http][0]}}");
+  assert_equals(location.pathname, "/workers/Worker-location.sub.any.worker.js");
+  assert_equals(location.search, "");
+  assert_equals(location.hash, "");
+}, 'Test WorkerLocation properties.');