diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 03a39838f47..a47cf4a77d8 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -50216,7 +50216,7 @@
      "/css/CSS2/fonts/font-weight-rule-005.xht",
      [
       [
-       "/css/CSS2/fonts/font-weight-bold-ref.html",
+       "/css/CSS2/fonts/font-weight-900-ref.html",
        "=="
       ]
      ],
@@ -50240,7 +50240,7 @@
      "/css/CSS2/fonts/font-weight-rule-007.xht",
      [
       [
-       "/css/CSS2/fonts/font-weight-normal-ref.html",
+       "/css/CSS2/fonts/font-weight-100-ref.html",
        "=="
       ]
      ],
@@ -103155,6 +103155,18 @@
      {}
     ]
    ],
+   "css/css-cascade/important-prop.html": [
+    [
+     "/css/css-cascade/important-prop.html",
+     [
+      [
+       "/css/css-cascade/important-prop-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-cascade/initial-color-background-001.html": [
     [
      "/css/css-cascade/initial-color-background-001.html",
@@ -118427,6 +118439,102 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-breaking-000.html": [
+    [
+     "/css/css-multicol/multicol-breaking-000.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-000-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-001.html": [
+    [
+     "/css/css-multicol/multicol-breaking-001.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-001-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-002.html": [
+    [
+     "/css/css-multicol/multicol-breaking-002.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-002-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-003.html": [
+    [
+     "/css/css-multicol/multicol-breaking-003.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-003-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-000.html": [
+    [
+     "/css/css-multicol/multicol-breaking-nobackground-000.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-nobackground-000-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-001.html": [
+    [
+     "/css/css-multicol/multicol-breaking-nobackground-001.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-nobackground-001-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-002.html": [
+    [
+     "/css/css-multicol/multicol-breaking-nobackground-002.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-nobackground-002-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-003.html": [
+    [
+     "/css/css-multicol/multicol-breaking-nobackground-003.html",
+     [
+      [
+       "/css/css-multicol/multicol-breaking-nobackground-003-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-clip-001.xht": [
     [
      "/css/css-multicol/multicol-clip-001.xht",
@@ -219375,6 +219483,16 @@
      {}
     ]
    ],
+   "css/CSS2/fonts/font-weight-100-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/CSS2/fonts/font-weight-900-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/CSS2/fonts/font-weight-bold-ref.html": [
     [
      {}
@@ -235255,6 +235373,11 @@
      {}
     ]
    ],
+   "css/css-cascade/important-prop-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-cascade/initial-color-background-001-ref.html": [
     [
      {}
@@ -246325,6 +246448,46 @@
      {}
     ]
    ],
+   "css/css-multicol/multicol-breaking-000-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-001-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-002-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-003-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-000-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-001-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-002-ref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-multicol/multicol-breaking-nobackground-003-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-multicol/multicol-clip-001-ref.xht": [
     [
      {}
@@ -256535,6 +256698,11 @@
      {}
     ]
    ],
+   "css/css-values/urls/support/empty-urls.css": [
+    [
+     {}
+    ]
+   ],
    "css/css-values/vh-calc-support.html": [
     [
      {}
@@ -269880,6 +270048,26 @@
      {}
     ]
    ],
+   "fetch/corb/resources/css-mislabeled-as-html-nosniff.css": [
+    [
+     {}
+    ]
+   ],
+   "fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers": [
+    [
+     {}
+    ]
+   ],
+   "fetch/corb/resources/css-mislabeled-as-html.css": [
+    [
+     {}
+    ]
+   ],
+   "fetch/corb/resources/css-mislabeled-as-html.css.headers": [
+    [
+     {}
+    ]
+   ],
    "fetch/corb/resources/css-with-json-parser-breaker.css": [
     [
      {}
@@ -308198,6 +308386,30 @@
      {}
     ]
    ],
+   "css/CSS2/floats/zero-space-between-floats-001.html": [
+    [
+     "/css/CSS2/floats/zero-space-between-floats-001.html",
+     {}
+    ]
+   ],
+   "css/CSS2/floats/zero-space-between-floats-002.html": [
+    [
+     "/css/CSS2/floats/zero-space-between-floats-002.html",
+     {}
+    ]
+   ],
+   "css/CSS2/floats/zero-space-between-floats-003.html": [
+    [
+     "/css/CSS2/floats/zero-space-between-floats-003.html",
+     {}
+    ]
+   ],
+   "css/CSS2/floats/zero-space-between-floats-004.html": [
+    [
+     "/css/CSS2/floats/zero-space-between-floats-004.html",
+     {}
+    ]
+   ],
    "css/compositing/mix-blend-mode/mix-blend-mode-creates-stacking-context.html": [
     [
      "/css/compositing/mix-blend-mode/mix-blend-mode-creates-stacking-context.html",
@@ -313782,12 +313994,36 @@
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/vertical-align.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/vertical-align.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/visibility.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/visibility.html",
+     {}
+    ]
+   ],
+   "css/css-typed-om/the-stylepropertymap/properties/white-space.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/white-space.html",
+     {}
+    ]
+   ],
    "css/css-typed-om/the-stylepropertymap/properties/width.html": [
     [
      "/css/css-typed-om/the-stylepropertymap/properties/width.html",
      {}
     ]
    ],
+   "css/css-typed-om/the-stylepropertymap/properties/z-index.html": [
+    [
+     "/css/css-typed-om/the-stylepropertymap/properties/z-index.html",
+     {}
+    ]
+   ],
    "css/css-ui/box-sizing-027.html": [
     [
      "/css/css-ui/box-sizing-027.html",
@@ -313890,6 +314126,12 @@
      {}
     ]
    ],
+   "css/css-values/urls/empty.html": [
+    [
+     "/css/css-values/urls/empty.html",
+     {}
+    ]
+   ],
    "css/css-values/viewport-relative-lengths-scaled-viewport.html": [
     [
      "/css/css-values/viewport-relative-lengths-scaled-viewport.html",
@@ -321536,12 +321778,6 @@
      {}
     ]
    ],
-   "fetch/corb/css-with-json-parser-breaker.sub.html": [
-    [
-     "/fetch/corb/css-with-json-parser-breaker.sub.html",
-     {}
-    ]
-   ],
    "fetch/corb/script-html-correctly-labeled.tentative.sub.html": [
     [
      "/fetch/corb/script-html-correctly-labeled.tentative.sub.html",
@@ -321560,6 +321796,30 @@
      {}
     ]
    ],
+   "fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html": [
+    [
+     "/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html",
+     {}
+    ]
+   ],
+   "fetch/corb/style-css-mislabeled-as-html.sub.html": [
+    [
+     "/fetch/corb/style-css-mislabeled-as-html.sub.html",
+     {}
+    ]
+   ],
+   "fetch/corb/style-css-with-json-parser-breaker.sub.html": [
+    [
+     "/fetch/corb/style-css-with-json-parser-breaker.sub.html",
+     {}
+    ]
+   ],
+   "fetch/corb/style-html-correctly-labeled.sub.html": [
+    [
+     "/fetch/corb/style-html-correctly-labeled.sub.html",
+     {}
+    ]
+   ],
    "fetch/data-urls/base64.any.js": [
     [
      "/fetch/data-urls/base64.any.html",
@@ -361788,9 +362048,9 @@
      {}
     ]
    ],
-   "webrtc/simplecall.html": [
+   "webrtc/simplecall.https.html": [
     [
-     "/webrtc/simplecall.html",
+     "/webrtc/simplecall.https.html",
      {}
     ]
    ],
@@ -436621,6 +436881,22 @@
    "7287e2ce42cab8fda1f63e97c98b664f0b49e9fb",
    "reftest"
   ],
+  "css/CSS2/floats/zero-space-between-floats-001.html": [
+   "59cd6c4ac06a611570a3ec21bac7289345b184f7",
+   "testharness"
+  ],
+  "css/CSS2/floats/zero-space-between-floats-002.html": [
+   "5c76122d32946ae2edddfd6db3359a8f78d1481b",
+   "testharness"
+  ],
+  "css/CSS2/floats/zero-space-between-floats-003.html": [
+   "1b797600103f3804777ee256c1cf6e7a6d3e3a1a",
+   "testharness"
+  ],
+  "css/CSS2/floats/zero-space-between-floats-004.html": [
+   "c9c5728c3a45287019bbb02614229920c42518eb",
+   "testharness"
+  ],
   "css/CSS2/fonts/font-001.xht": [
    "c255355156c612be7aef42ea77d8f0f37f779c68",
    "visual"
@@ -437885,6 +438161,14 @@
    "7ca13aa6842baeeca15685f76ca9bf98f91cf790",
    "visual"
   ],
+  "css/CSS2/fonts/font-weight-100-ref.html": [
+   "e23d6678e9351e7714bee0326d0bfbdccce8b986",
+   "support"
+  ],
+  "css/CSS2/fonts/font-weight-900-ref.html": [
+   "160d6ccc09eb3a122c35ede1904c9ef935397ebf",
+   "support"
+  ],
   "css/CSS2/fonts/font-weight-applies-to-001.xht": [
    "8bd64c85e94165c213139ccf731ff15589553768",
    "reftest"
@@ -437966,7 +438250,7 @@
    "reftest"
   ],
   "css/CSS2/fonts/font-weight-rule-005.xht": [
-   "b699094914be789b0c75101461bee49ca00d7b8b",
+   "c0850fb6740c914d8d86a02bdb0f8358805acd44",
    "reftest"
   ],
   "css/CSS2/fonts/font-weight-rule-006.xht": [
@@ -437974,7 +438258,7 @@
    "reftest"
   ],
   "css/CSS2/fonts/font-weight-rule-007.xht": [
-   "c35924d1e2817ddf468638d2bbb12f81f26bfbf9",
+   "4c894400b5aa931ea563d243c306c5aeb7857a15",
    "reftest"
   ],
   "css/CSS2/fonts/font-weight-rule-008.xht": [
@@ -480441,6 +480725,14 @@
    "1013a238512119cb926cf98db0e3cb2e33143ec3",
    "reftest"
   ],
+  "css/css-cascade/important-prop-ref.html": [
+   "3633b0204ab1cb13060656736d05c8666a5886d7",
+   "support"
+  ],
+  "css/css-cascade/important-prop.html": [
+   "8d20edef496f5d74a461ee9d27a2c0525db8b6c8",
+   "reftest"
+  ],
   "css/css-cascade/inherit-initial.html": [
    "67ecb845c4bcdacc8185b0f78d36856f9a408342",
    "testharness"
@@ -486550,7 +486842,7 @@
    "testharness"
   ],
   "css/css-fonts/OWNERS": [
-   "1c72d614a2fa507e3c4c127a3ac36f0f9e157460",
+   "4c9aabb4fac2a558b0828b50e2b06e01e43dd4b4",
    "support"
   ],
   "css/css-fonts/README": [
@@ -497193,6 +497485,70 @@
    "435a5b7f4bb2013c837b0bd67b16e67fa0e609f4",
    "reftest"
   ],
+  "css/css-multicol/multicol-breaking-000-ref.html": [
+   "e4a83f257c494f08206fe14fe53ceff1f26883ae",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-000.html": [
+   "ee027a791d82812073cffcf2fe06f3eaadd946b2",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-001-ref.html": [
+   "0ab9efdf0367c6a289aa98346f7f6f41c18f7eca",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-001.html": [
+   "6e04ac6aade0f5b8ef2f5e559cb50680e426c768",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-002-ref.html": [
+   "340e9ce51e8f1601978ce4f6e68bedd2bc9793fa",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-002.html": [
+   "0426728e14022bc60603c8b81198b3955813b78c",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-003-ref.html": [
+   "914f428c32c0e51c1c7da2b8775391863b011a48",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-003.html": [
+   "1259f387deefa1d4bf3cddfa89473fb2810e5d26",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-000-ref.html": [
+   "80a57a294a52ce1262e24e450767d1e35b478752",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-000.html": [
+   "da117cc772929da54f6b12498b29badb0c46c7b6",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-001-ref.html": [
+   "965bb4a85e255c5ba4a009519752482fb428e94e",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-001.html": [
+   "8673ecc308c4d1993adc394d17b1fb4cd1388670",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-002-ref.html": [
+   "fed97b08e699c5a691c4053b14182d0b37a923d7",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-002.html": [
+   "aa88dbcdf1543eaf8b4eef15bd2e11e80fbaebdc",
+   "reftest"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-003-ref.html": [
+   "c21a6843d46d3915db875da105ac77e509a0d747",
+   "support"
+  ],
+  "css/css-multicol/multicol-breaking-nobackground-003.html": [
+   "221c18f9d59802c2b41372425dc2839c09556e70",
+   "reftest"
+  ],
   "css/css-multicol/multicol-clip-001-ref.xht": [
    "6cc9e132ee13f51464a26aa9de40310ea9e02250",
    "support"
@@ -516501,10 +516857,26 @@
    "2723b6d3e9a213a1b33e9ecfafd5fd42eb8bca33",
    "testharness"
   ],
+  "css/css-typed-om/the-stylepropertymap/properties/vertical-align.html": [
+   "41ae6fd66b5a0e6f3b5f154d839362a4921712cc",
+   "testharness"
+  ],
+  "css/css-typed-om/the-stylepropertymap/properties/visibility.html": [
+   "8e0a268686a82cc4b4c5531b324da106e8d13856",
+   "testharness"
+  ],
+  "css/css-typed-om/the-stylepropertymap/properties/white-space.html": [
+   "f8afed394e920abbaa9eb8d2e6f4405ae4453c2c",
+   "testharness"
+  ],
   "css/css-typed-om/the-stylepropertymap/properties/width.html": [
    "b6f2104ac9a5a4e288b83e5d4db6077ba72a0bad",
    "testharness"
   ],
+  "css/css-typed-om/the-stylepropertymap/properties/z-index.html": [
+   "94c8c5e42806f81eeaf1a31463e2bd9653b465a3",
+   "testharness"
+  ],
   "css/css-ui/OWNERS": [
    "beeb8a77d396e48731fd1e69a922b6e2c84c2caa",
    "support"
@@ -519225,6 +519597,14 @@
    "ce34d77ec21c9b94a2ffe31d4f9e153e14605474",
    "testharness"
   ],
+  "css/css-values/urls/empty.html": [
+   "d12c1a89fba468dc6f521239c7f4368ebbca9b53",
+   "testharness"
+  ],
+  "css/css-values/urls/support/empty-urls.css": [
+   "0dcf82776fce7dc803c4ff258901081b96e2b6e7",
+   "support"
+  ],
   "css/css-values/vh-calc-support-pct.html": [
    "1d1b6fd96100b08b7abe0125d386edf736d57aa6",
    "reftest"
@@ -544597,10 +544977,6 @@
    "5dd841770382cd2f6f1a09dca1103ef146bc912a",
    "support"
   ],
-  "fetch/corb/css-with-json-parser-breaker.sub.html": [
-   "f8d39858fe81759e62e431e06f05b759ab3b5d77",
-   "testharness"
-  ],
   "fetch/corb/img-html-correctly-labeled.sub-expected.html": [
    "a252054121e7f50a3bcb949ae5a40f278c842c04",
    "support"
@@ -544625,8 +545001,24 @@
    "a7775fb534d38a5d5b5827a27f0c16e1268f4d0b",
    "reftest"
   ],
+  "fetch/corb/resources/css-mislabeled-as-html-nosniff.css": [
+   "7d3f1614c6d0170f67442ee60fe2aab6099bedc1",
+   "support"
+  ],
+  "fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers": [
+   "1bea535d497ae73eb7a84d3a14a5276e9d0ccc34",
+   "support"
+  ],
+  "fetch/corb/resources/css-mislabeled-as-html.css": [
+   "7d3f1614c6d0170f67442ee60fe2aab6099bedc1",
+   "support"
+  ],
+  "fetch/corb/resources/css-mislabeled-as-html.css.headers": [
+   "41e260e7df49e0e4ddb1fc5df11913dbda15edd7",
+   "support"
+  ],
   "fetch/corb/resources/css-with-json-parser-breaker.css": [
-   "dfcdf2ea931e4eeaaed36c471bad6b80f2c0115d",
+   "03d3cc6ac8caded97f3df43ca0c9cd04cf809e33",
    "support"
   ],
   "fetch/corb/resources/empty-labeled-as-png.png": [
@@ -544697,6 +545089,22 @@
    "f629f76593a03c769ca4a66b8cd9e5b1d2d20bfe",
    "testharness"
   ],
+  "fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html": [
+   "0bd3e77324334526a57f964bab33d06beb0b18b7",
+   "testharness"
+  ],
+  "fetch/corb/style-css-mislabeled-as-html.sub.html": [
+   "15a57e71c6a88bcb3193699007694784754022d2",
+   "testharness"
+  ],
+  "fetch/corb/style-css-with-json-parser-breaker.sub.html": [
+   "aefb6ce91d1be7998ed70dd6101fea451911af8c",
+   "testharness"
+  ],
+  "fetch/corb/style-html-correctly-labeled.sub.html": [
+   "465d933f4e52ef4e5a4bd0de40873410195843cd",
+   "testharness"
+  ],
   "fetch/data-urls/README.md": [
    "83d54a0532dd87ab1fa9f5f9b7e01d9a43d91eae",
    "support"
@@ -550150,7 +550558,7 @@
    "testharness"
   ],
   "html/dom/usvstring-reflection.html": [
-   "33a8ab2735650368c7cdc38226cb84be2dbbee85",
+   "221d4baf1cf0f7c06bef865aa8c5e01ce6436569",
    "testharness"
   ],
   "html/editing/.gitkeep": [
@@ -565074,7 +565482,7 @@
    "support"
   ],
   "interfaces/accelerometer.idl": [
-   "badeb96ae83c8173bb00884346d4f6dc675bbffa",
+   "6132c634314380a83c8a57647447826d95448939",
    "support"
   ],
   "interfaces/ambient-light.idl": [
@@ -565130,7 +565538,7 @@
    "support"
   ],
   "interfaces/gyroscope.idl": [
-   "77d4d59d0e83928f02b4652636d64df448b388d1",
+   "a2aa39ac39a5ec1eff5f5023a8134b5ec387b766",
    "support"
   ],
   "interfaces/hr-time.idl": [
@@ -565142,7 +565550,7 @@
    "support"
   ],
   "interfaces/magnetometer.idl": [
-   "779d9b394e75c9ad77b570c3f793de048fa054f9",
+   "78fdc6ec345a5f05e86cb104cb025689638bbe17",
    "support"
   ],
   "interfaces/mediacapture-main.idl": [
@@ -565150,7 +565558,7 @@
    "support"
   ],
   "interfaces/orientation-sensor.idl": [
-   "e1ed342f95e16b7082f8d83f0751a1f924fe0c21",
+   "2231f37838d4a168683a02fcebeb0c47e264b843",
    "support"
   ],
   "interfaces/payment-handler.idl": [
@@ -595601,8 +596009,8 @@
    "f0292ca52ee86920d0fdb8bccae2bc40a8ef99af",
    "testharness"
   ],
-  "webrtc/simplecall.html": [
-   "6194af79f137d59334da2193cc6f24b9458344be",
+  "webrtc/simplecall.https.html": [
+   "146432ca56e487a035df8ad9d5a7fa4a495b5405",
    "testharness"
   ],
   "webrtc/tools/.eslintrc.js": [
diff --git a/tests/wpt/metadata/css/css-values/vh_not_refreshing_on_chrome.html.ini b/tests/wpt/metadata/css/css-values/vh_not_refreshing_on_chrome.html.ini
new file mode 100644
index 00000000000..26435e28b09
--- /dev/null
+++ b/tests/wpt/metadata/css/css-values/vh_not_refreshing_on_chrome.html.ini
@@ -0,0 +1,2 @@
+[vh_not_refreshing_on_chrome.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini b/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
index 69f8f521e20..09be798a7ed 100644
--- a/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
+++ b/tests/wpt/metadata/html/dom/usvstring-reflection.html.ini
@@ -26,3 +26,6 @@
   [sendBeacon URL: unpaired surrogate codepoint should not make any exceptions.]
     expected: FAIL
 
+  [RTCDataChannel.send: unpaired surrogate codepoint should be replaced with U+FFFD.]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-001.html b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-001.html
new file mode 100644
index 00000000000..a7796011b01
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-001.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>A zero-width new formatting context should fit in a zero-width layout opportunity between floats</title>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#float-position" title="9.5.1 Positioning the float: the 'float' property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="container" style="position:relative; width:200px;">
+  <div style="float:left; width:100px; height:200px;"></div>
+  <div style="float:right; width:100px; height:200px;"></div>
+  <div data-offset-x="100" data-offset-y="0" style="overflow:hidden; width:0; height:200px;"></div>
+</div>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-002.html b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-002.html
new file mode 100644
index 00000000000..f8eb591998d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-002.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>A zero-width new formatting context should fit in a zero-width layout opportunity between floats, above a 100% wide float</title>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#float-position" title="9.5.1 Positioning the float: the 'float' property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="container" style="position:relative; width:200px;">
+  <div style="float:left; width:100px; height:200px;"></div>
+  <div style="float:right; width:100px; height:200px;"></div>
+  <div style="float:right; width:100%; height:10px;"></div>
+  <div data-offset-x="100" data-offset-y="0" style="overflow:hidden; width:0; height:200px;"></div>
+</div>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-003.html b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-003.html
new file mode 100644
index 00000000000..3ddbb871c05
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-003.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Zero-width new formatting context with clearance</title>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#float-position" title="9.5.1 Positioning the float: the 'float' property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="container" style="position:relative; width:200px;">
+  <div style="float:left; width:100px; height:100px;"></div>
+  <div style="float:right; width:100px; height:100px;"></div>
+  <div style="float:right; width:100%; height:100px;"></div>
+  <div data-offset-x="0" data-offset-y="100" style="overflow:hidden; clear:left; width:0;"></div>
+</div>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-004.html b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-004.html
new file mode 100644
index 00000000000..4ac426fe6be
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/floats/zero-space-between-floats-004.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Zero-width new formatting context with clearance</title>
+<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/CSS22/visuren.html#float-position" title="9.5.1 Positioning the float: the 'float' property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="container" style="position:relative; width:200px;">
+  <div style="float:left; width:100px; height:100px;"></div>
+  <div style="float:right; width:100px; height:100px;"></div>
+  <div style="float:right; width:100%; height:100px;"></div>
+  <div data-offset-x="0" data-offset-y="200" style="overflow:hidden; clear:right; width:0;"></div>
+</div>
+<script>
+  checkLayout("#container");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-100-ref.html b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-100-ref.html
new file mode 100644
index 00000000000..a3bd0d2228c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-100-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Reference</title>
+<link rel="author" title="Mike Bremford" href="http://bfo.com">
+<style>
+div { font-weight: 100 }
+</style>
+<body>
+  <p>Test passes if the lines of "Filler Text" below match.</p>
+  <div>Filler Text</div>
+  <div>Filler Text</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-900-ref.html b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-900-ref.html
new file mode 100644
index 00000000000..cc3ba5d2d42
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-900-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Reference</title>
+<link rel="author" title="Mike Bremford" href="http://bfo.com">
+<style>
+div { font-weight: 900 }
+</style>
+<body>
+  <p>Test passes if the lines of "Filler Text" below match.</p>
+  <div>Filler Text</div>
+  <div>Filler Text</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-005.xht b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-005.xht
index 742af3db72b..d7213e39c6d 100644
--- a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-005.xht
+++ b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-005.xht
@@ -5,7 +5,7 @@
         <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
         <link rel="help" href="http://www.w3.org/TR/CSS21/fonts.html#font-boldness" />
         <link rel="help" href="http://www.w3.org/TR/css-fonts-3/#font-weight-prop" />
-        <link rel="match" href="font-weight-bold-ref.html" />
+        <link rel="match" href="font-weight-900-ref.html" />
         <meta name="flags" content="" />
         <meta name="assert" content="The 'font-weight' property set to 'bolder' does not increase the value of font weight when the parent values is already set at 900." />
         <style type="text/css">
diff --git a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-007.xht b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-007.xht
index 8c3b8e34c95..cf51b12c26a 100644
--- a/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-007.xht
+++ b/tests/wpt/web-platform-tests/css/CSS2/fonts/font-weight-rule-007.xht
@@ -5,7 +5,7 @@
         <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
         <link rel="help" href="http://www.w3.org/TR/CSS21/fonts.html#font-boldness" />
         <link rel="help" href="http://www.w3.org/TR/css-fonts-3/#font-weight-prop" />
-        <link rel="match" href="font-weight-normal-ref.html" />
+        <link rel="match" href="font-weight-100-ref.html" />
         <meta name="flags" content="" />
         <meta name="assert" content="A font weight of 'lighter' selects the next lighter weight compared to its parent's weight." />
         <style type="text/css">
diff --git a/tests/wpt/web-platform-tests/css/css-cascade/important-prop-ref.html b/tests/wpt/web-platform-tests/css/css-cascade/important-prop-ref.html
new file mode 100644
index 00000000000..004679da730
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-cascade/important-prop-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Cascade Green Right Square Reference File</title>
+<link rel="author" title="David Burns" href="http://www.theautomatedtester.co.uk">
+<style>
+#success {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+<body>
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+  <div>
+    <div id="success"></div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-cascade/important-prop.html b/tests/wpt/web-platform-tests/css/css-cascade/important-prop.html
new file mode 100644
index 00000000000..5a3dad10897
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-cascade/important-prop.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>CSS Cascade: Important</title>
+  <link rel="author" title="David Burns" href="http://www.theautomatedtester.co.uk">
+  <link rel="help" href="https://drafts.csswg.org/css-cascade/#importance">
+  <link rel="match" href="important-prop-ref.html">
+  <meta name="flags" content="">
+  <style>
+  @keyframes override{
+   from, to{background-color: #f00;}
+  }
+
+  .square {
+    color:#00f;
+    animation: override 1s infinite;
+    width: 100px;
+    height: 100px;
+  }
+  .green {
+    background-color:green !important;
+  }
+  </style>
+</head>
+<body>
+  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+  <div class="square green"></div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-fonts/OWNERS b/tests/wpt/web-platform-tests/css/css-fonts/OWNERS
index 26a28ce9f5d..f3c875d37cb 100644
--- a/tests/wpt/web-platform-tests/css/css-fonts/OWNERS
+++ b/tests/wpt/web-platform-tests/css/css-fonts/OWNERS
@@ -2,3 +2,4 @@
 @yunxiaoxie
 @nattokirai
 @litherum
+@drott
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000-ref.html
new file mode 100644
index 00000000000..3d496cd391a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000-ref.html
@@ -0,0 +1,66 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.blueborders {
+  position: absolute;
+  top: 0;
+  left: 194px; /* 188px first column + (16px gap - 4px rule) / 2 */
+  width: 200px; /* 188px second column + (16px gap - 4px rule) */
+  height: 100px;
+  border-right: blue solid 4px;
+  border-left: blue solid 4px;
+}
+
+.innerbg {
+  height: 100px;
+  width: 188px;
+  background: rgba(255, 0, 255, 0.3);
+  position: absolute;
+  top: 0;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="blueborders"></div>
+  <div class="innerbg" style="left: 0"></div>
+  <div class="inner lefthalf" style="left: 0; height: 60px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="innerbg" style="left: 204px"></div>
+  <div class="innerbg" style="left: 408px"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000.html
new file mode 100644
index 00000000000..391985d6a89
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-000.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-000-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-rule: 4px solid blue;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  background: rgba(255, 0, 255, 0.3);
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001-ref.html
new file mode 100644
index 00000000000..46357f940d2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001-ref.html
@@ -0,0 +1,82 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.blueborders {
+  position: absolute;
+  top: 0;
+  left: 194px; /* 188px first column + (16px gap - 4px rule) / 2 */
+  width: 200px; /* 188px second column + (16px gap - 4px rule) */
+  height: 100px;
+  border-right: blue solid 4px;
+  border-left: blue solid 4px;
+}
+
+.innerbg {
+  height: 100px;
+  width: 188px;
+  background: rgba(255, 0, 255, 0.3);
+  position: absolute;
+  top: 0;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="blueborders"></div>
+  <div class="innerbg" style="left: 0"></div>
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="innerbg" style="left: 204px"></div>
+  <div class="inner lefthalf" style="left: 204px; height: 80px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ<br>
+  </div>
+  <div class="innerbg" style="left: 408px"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001.html
new file mode 100644
index 00000000000..69c9049266d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-001.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-001-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-rule: 4px solid blue;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  background: rgba(255, 0, 255, 0.3);
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002-ref.html
new file mode 100644
index 00000000000..9b6c5f860bd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002-ref.html
@@ -0,0 +1,99 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.blueborders {
+  position: absolute;
+  top: 0;
+  left: 194px; /* 188px first column + (16px gap - 4px rule) / 2 */
+  width: 200px; /* 188px second column + (16px gap - 4px rule) */
+  height: 100px;
+  border-right: blue solid 4px;
+  border-left: blue solid 4px;
+}
+
+.innerbg {
+  height: 100px;
+  width: 188px;
+  background: rgba(255, 0, 255, 0.3);
+  position: absolute;
+  top: 0;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="blueborders"></div>
+  <div class="innerbg" style="left: 0"></div>
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="innerbg" style="left: 204px"></div>
+  <div class="inner lefthalf" style="left: 204px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    PPPPP<br>
+    QQQQQ<br>
+    RRRRR<br>
+    SSSSS<br>
+    TTTTT
+  </div>
+  <div class="innerbg" style="left: 408px"></div>
+  <div class="inner lefthalf" style="left: 408px">
+    UUUUU<br>
+    VVVVV<br>
+    WWWWW<br>
+    XXXXX<br>
+    YYYYY
+  </div>
+  <div class="inner righthalf" style="left: 503px">
+    ZZZZZ<br>
+    aaaaa<br>
+    bbbbb<br>
+    ccccc<br>
+    ddddd
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002.html
new file mode 100644
index 00000000000..279ed941cbe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-002.html
@@ -0,0 +1,64 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-002-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-rule: 4px solid blue;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  background: rgba(255, 0, 255, 0.3);
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ<br>
+    RRRRR<br>
+    SSSSS<br>
+    TTTTT<br>
+    UUUUU<br>
+    VVVVV<br>
+    WWWWW<br>
+    XXXXX<br>
+    YYYYY<br>
+    ZZZZZ<br>
+    aaaaa<br>
+    bbbbb<br>
+    ccccc<br>
+    ddddd
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003-ref.html
new file mode 100644
index 00000000000..eb0d55d64d9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003-ref.html
@@ -0,0 +1,82 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.blueborders {
+  position: absolute;
+  top: 0;
+  left: 194px; /* 188px first column + (16px gap - 4px rule) / 2 */
+  width: 200px; /* 188px second column + (16px gap - 4px rule) */
+  height: 100px;
+  border-right: blue solid 4px;
+  border-left: blue solid 4px;
+}
+
+.innerbg {
+  height: 100px;
+  width: 188px;
+  background: rgba(255, 0, 255, 0.3);
+  position: absolute;
+  top: 0;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="blueborders"></div>
+  <div class="innerbg" style="left: 0"></div>
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="innerbg" style="left: 204px"></div>
+  <div class="inner lefthalf" style="left: 204px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    PPPPP<br>
+    QQQQQ
+  </div>
+  <div class="innerbg" style="left: 408px"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003.html
new file mode 100644
index 00000000000..102202dd1da
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-003.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-003-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-rule: 4px solid blue;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  background: rgba(255, 0, 255, 0.3);
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px; column-fill: auto">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000-ref.html
new file mode 100644
index 00000000000..e7ebcff4a08
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000-ref.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner lefthalf" style="left: 0; height: 60px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    DDDDD<br>
+    EEEEE
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000.html
new file mode 100644
index 00000000000..a66a58fc746
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-000.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-nobackground-000-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001-ref.html
new file mode 100644
index 00000000000..006ec1d2221
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001-ref.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="inner lefthalf" style="left: 204px; height: 80px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ<br>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001.html
new file mode 100644
index 00000000000..d47fcd31a0a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-001.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-nobackground-001-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002-ref.html
new file mode 100644
index 00000000000..5ec4c616973
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002-ref.html
@@ -0,0 +1,77 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="inner lefthalf" style="left: 204px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    PPPPP<br>
+    QQQQQ<br>
+    RRRRR<br>
+    SSSSS<br>
+    TTTTT
+  </div>
+  <div class="inner lefthalf" style="left: 408px">
+    UUUUU<br>
+    VVVVV<br>
+    WWWWW<br>
+    XXXXX<br>
+    YYYYY
+  </div>
+  <div class="inner righthalf" style="left: 503px">
+    ZZZZZ<br>
+    aaaaa<br>
+    bbbbb<br>
+    ccccc<br>
+    ddddd
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002.html
new file mode 100644
index 00000000000..e20568fd17e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-002.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-nobackground-002-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ<br>
+    RRRRR<br>
+    SSSSS<br>
+    TTTTT<br>
+    UUUUU<br>
+    VVVVV<br>
+    WWWWW<br>
+    XXXXX<br>
+    YYYYY<br>
+    ZZZZZ<br>
+    aaaaa<br>
+    bbbbb<br>
+    ccccc<br>
+    ddddd
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003-ref.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003-ref.html
new file mode 100644
index 00000000000..471df948ca8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003-ref.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<title>CSS Test Reference: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<style>
+
+.outer {
+  height: 100px;
+  width: 800px;
+  background: rgba(0, 0, 255, 0.3);
+  position: relative;
+}
+
+.inner {
+  height: 100px;
+  width: 86px;
+  font: 16px/1.25 sans-serif;
+  position: absolute;
+  top: 0;
+}
+
+.lefthalf {
+  border-right: 2px solid fuchsia;
+  padding-right: 7px;
+}
+
+.righthalf {
+  padding-left: 7px;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner lefthalf" style="left: 0">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE
+  </div>
+  <div class="inner righthalf" style="left: 95px">
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ
+  </div>
+  <div class="inner lefthalf" style="left: 204px">
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO
+  </div>
+  <div class="inner righthalf" style="left: 299px">
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003.html b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003.html
new file mode 100644
index 00000000000..edf18f98981
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-multicol/multicol-breaking-nobackground-003.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<title>CSS Test: breaking of a multicolumn</title>
+<meta charset="utf-8">
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="https://mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#column-gaps-and-rules">
+<link rel="help" href="https://drafts.csswg.org/css-multicol/#cf">
+<link rel="match" href="multicol-breaking-nobackground-003-ref.html">
+<style>
+
+.outer {
+  height: 100px;
+  column-fill: auto;
+  width: 800px;
+  column-count: 4;
+  column-gap: 16px;
+  background: rgba(0, 0, 255, 0.3);
+}
+
+.inner {
+  column-count: 2;
+  column-rule: 2px solid fuchsia;
+  column-gap: 16px;
+  font: 16px/1.25 sans-serif;
+}
+
+</style>
+
+<div class="outer">
+  <div class="inner" style="height: 300px; column-fill: auto">
+    AAAAA<br>
+    BBBBB<br>
+    CCCCC<br>
+    DDDDD<br>
+    EEEEE<br>
+    FFFFF<br>
+    GGGGG<br>
+    HHHHH<br>
+    IIIII<br>
+    JJJJJ<br>
+    KKKKK<br>
+    LLLLL<br>
+    MMMMM<br>
+    NNNNN<br>
+    OOOOO<br>
+    PPPPP<br>
+    QQQQQ
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/vertical-align.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/vertical-align.html
new file mode 100644
index 00000000000..af022fdae57
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/vertical-align.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'vertical-align' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('vertical-align', [
+  { syntax: 'baseline'},
+  // and other keywords
+  { syntax: '<length>' },
+  { syntax: '<percentage>' }
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html
new file mode 100644
index 00000000000..4cfcf6576db
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/visibility.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'visibility' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('visibility', [
+  { syntax: 'visible'},
+  { syntax: 'hidden' }
+  // and other keywords
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html
new file mode 100644
index 00000000000..9cd2d6e9741
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'white-space' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('white-space', [
+  { syntax: 'normal'},
+  { syntax: 'nowrap' }
+  // and other keywords
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/z-index.html b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/z-index.html
new file mode 100644
index 00000000000..1e2a86a2827
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-typed-om/the-stylepropertymap/properties/z-index.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>'z-index' property</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
+<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#property-stle-value-normalization">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../resources/testhelper.js"></script>
+<script src="resources/testsuite.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+runPropertyTests('z-index', [
+  { syntax: 'auto'},
+  // FIXME: This also supports <integer> but the testharness
+  // doesn't support that yet.
+  // { syntax: '<integer>' }
+]);
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-values/urls/empty.html b/tests/wpt/web-platform-tests/css/css-values/urls/empty.html
new file mode 100644
index 00000000000..3ab7079396c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-values/urls/empty.html
@@ -0,0 +1,40 @@
+<!doctype html>
+<title>Empty URLs behaviour</title>
+<link rel=help href=https://drafts.csswg.org/css-values/#url-empty>
+<link rel=help href=https://github.com/w3c/csswg-drafts/issues/2211#issuecomment-365677844>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<style>
+#inline-unquoted {
+    background-image: url();
+}
+
+#inline-quoted {
+    background-image: url("");
+}
+</style>
+<link rel=stylesheet href=support/empty-urls.css>
+<div id="inline-unquoted"></div>
+<div id="inline-quoted"></div>
+<div id="external-unquoted"></div>
+<div id="external-quoted"></div>
+<script>
+const ids = [
+  "inline-unquoted",
+  "inline-quoted",
+  "external-unquoted",
+  "external-quoted"
+];
+
+const inline_url = location.href;
+const external_url = new URL(document.querySelector("link[rel=stylesheet]").href, location.href).href;
+
+for (let id of ids) {
+    test(function() {
+        const el = document.getElementById(id);
+        const expected = id.startsWith("inline-") ? inline_url : external_url;
+        const style = window.getComputedStyle(el);
+        assert_equals(style["background-image"], 'url("' + expected + '")');
+    }, "empty URL: " + id);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-values/urls/support/empty-urls.css b/tests/wpt/web-platform-tests/css/css-values/urls/support/empty-urls.css
new file mode 100644
index 00000000000..ceed358f348
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-values/urls/support/empty-urls.css
@@ -0,0 +1,7 @@
+#external-unquoted {
+    background-image: url();
+}
+
+#external-quoted {
+    background-image: url("");
+}
diff --git a/tests/wpt/web-platform-tests/fetch/corb/css-with-json-parser-breaker.sub.html b/tests/wpt/web-platform-tests/fetch/corb/css-with-json-parser-breaker.sub.html
deleted file mode 100644
index 7e059e723d4..00000000000
--- a/tests/wpt/web-platform-tests/fetch/corb/css-with-json-parser-breaker.sub.html
+++ /dev/null
@@ -1,20 +0,0 @@
-<!doctype html>
-<meta charset="utf-8">
-<title>CORB should not block text/css with a JSON parser breaker</title>
-<script src=/resources/testharness.js></script>
-<script src=/resources/testharnessreport.js></script>
-
-<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
-<link rel="stylesheet" type="text/css"
-      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-with-json-parser-breaker.css">
-
-<body>
-  <h1 id="header">Header example</h1>
-  <p>Paragraph body</p>
-</body>
-
-<script>
-var style = getComputedStyle(document.getElementById('header'));
-assert_equals(style.getPropertyValue('color'), 'rgb(255, 0, 0)');
-done();
-</script>
diff --git a/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css
new file mode 100644
index 00000000000..afd2b92975d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css
@@ -0,0 +1 @@
+#header { color: red; }
diff --git a/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers
new file mode 100644
index 00000000000..0f228f94ecb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers
@@ -0,0 +1,2 @@
+Content-Type: text/html
+X-Content-Type-Options: nosniff
diff --git a/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css
new file mode 100644
index 00000000000..afd2b92975d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css
@@ -0,0 +1 @@
+#header { color: red; }
diff --git a/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css.headers b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/resources/css-mislabeled-as-html.css.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/tests/wpt/web-platform-tests/fetch/corb/resources/css-with-json-parser-breaker.css b/tests/wpt/web-platform-tests/fetch/corb/resources/css-with-json-parser-breaker.css
index 3ba33659844..7db6f5c6d36 100644
--- a/tests/wpt/web-platform-tests/fetch/corb/resources/css-with-json-parser-breaker.css
+++ b/tests/wpt/web-platform-tests/fetch/corb/resources/css-with-json-parser-breaker.css
@@ -1,3 +1,3 @@
 )]}'
 {}
-h1 { color: red; }
+#header { color: red; }
diff --git a/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html b/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html
new file mode 100644
index 00000000000..1d53621186d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- Test verifies that a stylesheet mislabeled as html won't execute with and
+  without CORB if the nosniff response header is present.
+
+  The expected behavior is covered by the Fetch spec at
+  https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-nosniff?
+
+  See also the following tests:
+  - fetch/nosniff/stylesheet.html
+-->
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-mislabeled-as-html-nosniff.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+// Verify that CSS is not applied (because of nosniff + non-text/css headers).
+let style = getComputedStyle(document.getElementById('header'));
+const external_color = 'rgb(255, 0, 0)';  // red
+const default_color = 'rgb(0, 128, 0)';  // green
+assert_equals(style.getPropertyValue('color'), default_color);
+assert_not_equals(style.getPropertyValue('color'), external_color);
+done();
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html.sub.html b/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html.sub.html
new file mode 100644
index 00000000000..05f6fdb9fb9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/style-css-mislabeled-as-html.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't impact a cross-origin stylesheet mislabeled
+  as text/html (because even without CORB mislabeled CSS will be rejected).
+-->
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-mislabeled-as-html.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+// Verify that CSS is not applied (because of strict content-type enforcement
+// for cross-origin stylesheets).
+let style = getComputedStyle(document.getElementById('header'));
+const external_color = 'rgb(255, 0, 0)';  // red
+const default_color = 'rgb(0, 128, 0)';  // green
+assert_equals(style.getPropertyValue('color'), default_color);
+assert_not_equals(style.getPropertyValue('color'), external_color);
+done();
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/corb/style-css-with-json-parser-breaker.sub.html b/tests/wpt/web-platform-tests/fetch/corb/style-css-with-json-parser-breaker.sub.html
new file mode 100644
index 00000000000..c6b5889c331
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/style-css-with-json-parser-breaker.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't block a stylesheet that
+     1) is correctly labeled with text/css Content-Type and parsing fine as text/css
+     2) starts with a JSON parser breaker (like )]}')
+-->
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-with-json-parser-breaker.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+// Verify that CSS got applied / did not get blocked by CORB.
+let style = getComputedStyle(document.getElementById('header'));
+const external_color = 'rgb(255, 0, 0)';  // red
+const default_color = 'rgb(0, 128, 0)';  // green
+assert_equals(style.getPropertyValue('color'), external_color);
+assert_not_equals(style.getPropertyValue('color'), default_color);
+done();
+</script>
diff --git a/tests/wpt/web-platform-tests/fetch/corb/style-html-correctly-labeled.sub.html b/tests/wpt/web-platform-tests/fetch/corb/style-html-correctly-labeled.sub.html
new file mode 100644
index 00000000000..c99eb053d61
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/corb/style-html-correctly-labeled.sub.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!-- Test verifies that using a HTML document as a stylesheet has no observable
+  differences with and without CORB:
+  - The cross-origin stylesheet requires a correct text/css Content-Type
+    and therefore won't render even without CORB.  This aspect of this test
+    is similar to the style-css-mislabeled-as-html.sub.html test.
+  - Even if the Content-Type requirements were relaxed for cross-origin stylesheets,
+    the HTML document is unlikely to parse as a stylesheet (unless a polyglot
+    HTML/CSS document is crafted as part of an attack) and therefore the
+    observable behavior should be indistinguishable from parsing the empty,
+    CORB-blocked response as a stylesheet.
+-->
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This is not really a stylesheet... -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/html-correctly-labeled.html">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+// Verify that CSS is not applied (because of mismatched Content-Type header).
+var style = getComputedStyle(document.getElementById('header'));
+const default_color = 'rgb(0, 128, 0)';  // green
+assert_equals(style.getPropertyValue('color'), default_color);
+done();
+</script>
diff --git a/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html b/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
index aaf6c0bee60..edbf4e2442b 100644
--- a/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
+++ b/tests/wpt/web-platform-tests/html/dom/usvstring-reflection.html
@@ -2,6 +2,7 @@
 <title>USVString test relate to url</title>
 <script src=/resources/testharness.js></script>
 <script src=/resources/testharnessreport.js></script>
+<script src="../../webrtc/RTCPeerConnection-helper.js"></script>
 <div id=log></div>
 <script>
 // Unpaired surrogate codepoints present in USVString are replaced
@@ -109,4 +110,20 @@ test(() => {
   assert_equals(w.document.documentURI, 'about:blank#%EF%BF%BD');
 }, "Document URLs: unpaired surrogate codepoint should be replaced with U+FFFD")
 
+promise_test(t => {
+  const sendString = 'hello\uD999';
+  const receiveString = 'hello\uFFFD';
+
+  return createDataChannelPair()
+  .then(([channel1, channel2]) => {
+    channel1.send(sendString);
+    return awaitMessage(channel2)
+  }).then(message => {
+    assert_equals(typeof message, 'string',
+      'Expect message to be a string');
+
+    assert_equals(message, receiveString);
+  });
+}, "RTCDataChannel.send: unpaired surrogate codepoint should be replaced with U+FFFD.")
+
 </script>
diff --git a/tests/wpt/web-platform-tests/interfaces/accelerometer.idl b/tests/wpt/web-platform-tests/interfaces/accelerometer.idl
index 7e5509d432b..dbde9da8672 100644
--- a/tests/wpt/web-platform-tests/interfaces/accelerometer.idl
+++ b/tests/wpt/web-platform-tests/interfaces/accelerometer.idl
@@ -1,20 +1,23 @@
-enum LocalCoordinateSystem { "device", "screen" };
-
-dictionary SpatialSensorOptions : SensorOptions {
-  LocalCoordinateSystem referenceFrame = "device";
-};
-
-[Constructor(optional SpatialSensorOptions options), SecureContext, Exposed=Window]
+[Constructor(optional AccelerometerSensorOptions options), SecureContext,
+  Exposed=Window]
 interface Accelerometer : Sensor {
   readonly attribute double? x;
   readonly attribute double? y;
   readonly attribute double? z;
 };
 
-[Constructor(optional SpatialSensorOptions options), SecureContext, Exposed=Window]
+enum LocalCoordinateSystem { "device", "screen" };
+
+dictionary AccelerometerSensorOptions : SensorOptions {
+  LocalCoordinateSystem referenceFrame = "device";
+};
+
+[Constructor(optional AccelerometerSensorOptions options), SecureContext,
+  Exposed=Window]
 interface LinearAccelerationSensor : Accelerometer {
 };
 
-[Constructor(optional SensorOptions options), SecureContext, Exposed=Window]
+[Constructor(optional AccelerometerSensorOptions options), SecureContext,
+  Exposed=Window]
 interface GravitySensor : Accelerometer {
 };
diff --git a/tests/wpt/web-platform-tests/interfaces/gyroscope.idl b/tests/wpt/web-platform-tests/interfaces/gyroscope.idl
index 227a3b96a29..86e70a814f8 100644
--- a/tests/wpt/web-platform-tests/interfaces/gyroscope.idl
+++ b/tests/wpt/web-platform-tests/interfaces/gyroscope.idl
@@ -1,6 +1,12 @@
-[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
+[Constructor(optional GyroscopeSensorOptions sensorOptions), SecureContext, Exposed=Window]
 interface Gyroscope : Sensor {
   readonly attribute double? x;
   readonly attribute double? y;
   readonly attribute double? z;
 };
+
+enum LocalCoordinateSystem { "device", "screen" };
+
+dictionary GyroscopeSensorOptions : SensorOptions {
+  LocalCoordinateSystem referenceFrame = "device";
+};
diff --git a/tests/wpt/web-platform-tests/interfaces/magnetometer.idl b/tests/wpt/web-platform-tests/interfaces/magnetometer.idl
index 184757a23be..5ede1ecdb7c 100644
--- a/tests/wpt/web-platform-tests/interfaces/magnetometer.idl
+++ b/tests/wpt/web-platform-tests/interfaces/magnetometer.idl
@@ -1,11 +1,19 @@
-[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
+[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
+  Exposed=Window]
 interface Magnetometer : Sensor {
   readonly attribute double? x;
   readonly attribute double? y;
   readonly attribute double? z;
 };
 
-[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
+enum LocalCoordinateSystem { "device", "screen" };
+
+dictionary MagnetometerSensorOptions : SensorOptions {
+  LocalCoordinateSystem referenceFrame = "device";
+};
+
+[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
+  Exposed=Window]
 interface UncalibratedMagnetometer : Sensor {
   readonly attribute double? x;
   readonly attribute double? y;
diff --git a/tests/wpt/web-platform-tests/interfaces/orientation-sensor.idl b/tests/wpt/web-platform-tests/interfaces/orientation-sensor.idl
index 3f9644515d4..04040e4326d 100644
--- a/tests/wpt/web-platform-tests/interfaces/orientation-sensor.idl
+++ b/tests/wpt/web-platform-tests/interfaces/orientation-sensor.idl
@@ -6,10 +6,16 @@ interface OrientationSensor : Sensor {
   void populateMatrix(RotationMatrixType targetMatrix);
 };
 
-[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
+enum LocalCoordinateSystem { "device", "screen" };
+
+dictionary OrientationSensorOptions : SensorOptions {
+  LocalCoordinateSystem referenceFrame = "device";
+};
+
+[Constructor(optional OrientationSensorOptions sensorOptions), SecureContext, Exposed=Window]
 interface AbsoluteOrientationSensor : OrientationSensor {
 };
 
-[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
+[Constructor(optional OrientationSensorOptions sensorOptions), SecureContext, Exposed=Window]
 interface RelativeOrientationSensor : OrientationSensor {
 };
diff --git a/tests/wpt/web-platform-tests/tools/lint/lint.py b/tests/wpt/web-platform-tests/tools/lint/lint.py
index c1a6ce02d1e..b47637a227f 100644
--- a/tests/wpt/web-platform-tests/tools/lint/lint.py
+++ b/tests/wpt/web-platform-tests/tools/lint/lint.py
@@ -430,7 +430,7 @@ def check_parsed(repo_root, path, f):
     for reftest_node in source_file.reftest_nodes:
         href = reftest_node.attrib.get("href", "").strip(space_chars)
         parts = urlsplit(href)
-        if parts.scheme or parts.netloc:
+        if (parts.scheme or parts.netloc) and parts != urlsplit("about:blank"):
             errors.append(("ABSOLUTE-URL-REF",
                      "Reference test with a reference file specified via an absolute URL: '%s'" % href, path, None))
             continue
diff --git a/tests/wpt/web-platform-tests/tools/lint/tests/dummy/ref/about_blank-ref.html b/tests/wpt/web-platform-tests/tools/lint/tests/dummy/ref/about_blank-ref.html
new file mode 100644
index 00000000000..8f940b540f9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/lint/tests/dummy/ref/about_blank-ref.html
@@ -0,0 +1 @@
+<link rel="match" href=about:blank>
diff --git a/tests/wpt/web-platform-tests/tools/lint/tests/test_lint.py b/tests/wpt/web-platform-tests/tools/lint/tests/test_lint.py
index 9375e2f7560..ed552472733 100644
--- a/tests/wpt/web-platform-tests/tools/lint/tests/test_lint.py
+++ b/tests/wpt/web-platform-tests/tools/lint/tests/test_lint.py
@@ -213,6 +213,16 @@ def test_ref_absolute_url(caplog):
     assert "ref/absolute.html" in caplog.text
 
 
+def test_about_blank_as_ref(caplog):
+    with _mock_lint("check_path") as mocked_check_path:
+        with _mock_lint("check_file_contents") as mocked_check_file_contents:
+            rv = lint(_dummy_repo, ["about_blank-ref.html"], "normal")
+            assert rv == 0
+            assert not mocked_check_path.called
+            assert not mocked_check_file_contents.called
+    assert caplog.text == ""
+
+
 def test_ref_same_file_empty(caplog):
     with _mock_lint("check_path") as mocked_check_path:
         with _mock_lint("check_file_contents") as mocked_check_file_contents:
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
index 7b78898344f..8a3f9c9966f 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/webdriver_server.py
@@ -137,9 +137,9 @@ class ChromeDriverServer(WebDriverServer):
 
 class EdgeDriverServer(WebDriverServer):
     def __init__(self, logger, binary="microsoftwebdriver.exe", port=None,
-                 base_path="", args=None):
+                 base_path="", host="localhost", args=None):
         WebDriverServer.__init__(
-            self, logger, binary, port=port, base_path=base_path, args=args)
+            self, logger, binary, host=host, port=port, args=args)
 
     def make_command(self):
         return [self.binary,
diff --git a/tests/wpt/web-platform-tests/webrtc/simplecall.html b/tests/wpt/web-platform-tests/webrtc/simplecall.https.html
similarity index 95%
rename from tests/wpt/web-platform-tests/webrtc/simplecall.html
rename to tests/wpt/web-platform-tests/webrtc/simplecall.https.html
index f27c7ff1e85..4d948ee34e3 100644
--- a/tests/wpt/web-platform-tests/webrtc/simplecall.html
+++ b/tests/wpt/web-platform-tests/webrtc/simplecall.https.html
@@ -86,11 +86,15 @@ property to true in Firefox.
 
   var onIceCandidateToFirst = test.step_func(function(event) {
     // If event.candidate is null = no more candidates.
-    gSecondConnection.addIceCandidate(event.candidate);
+    if (event.candidate) {
+      gSecondConnection.addIceCandidate(event.candidate);
+    }
   });
 
   var onIceCandidateToSecond = test.step_func(function(event) {
-    gFirstConnection.addIceCandidate(event.candidate);
+    if (event.candidate) {
+      gFirstConnection.addIceCandidate(event.candidate);
+    }
   });
 
   var onRemoteTrack = test.step_func(function(event) {