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 7fa0a220fe8..78ff1b06ae7 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -136969,6 +136969,30 @@
      {}
     ]
    ],
+   "css/css-tables/border-collapse-double-border.html": [
+    [
+     "/css/css-tables/border-collapse-double-border.html",
+     [
+      [
+       "/css/css-tables/border-collapse-double-border-notref.html",
+       "!="
+      ]
+     ],
+     {}
+    ]
+   ],
+   "css/css-tables/border-conflict-resolution.html": [
+    [
+     "/css/css-tables/border-conflict-resolution.html",
+     [
+      [
+       "/css/css-tables/border-conflict-resolution-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-tables/fixup-dynamic-anonymous-inline-table-001.html": [
     [
      "/css/css-tables/fixup-dynamic-anonymous-inline-table-001.html",
@@ -269819,6 +269843,16 @@
      {}
     ]
    ],
+   "css/css-tables/border-collapse-double-border-notref.html": [
+    [
+     {}
+    ]
+   ],
+   "css/css-tables/border-conflict-resolution-ref.html": [
+    [
+     {}
+    ]
+   ],
    "css/css-tables/floats/floats-wrap-bfc-006b-ref.xht": [
     [
      {}
@@ -322214,6 +322248,11 @@
      {}
     ]
    ],
+   "webdriver/tests/new_window/__init__.py": [
+    [
+     {}
+    ]
+   ],
    "webdriver/tests/perform_actions/__init__.py": [
     [
      {}
@@ -345913,6 +345952,12 @@
      {}
     ]
    ],
+   "css/css-scroll-anchoring/clamp-negative-overflow.html": [
+    [
+     "/css/css-scroll-anchoring/clamp-negative-overflow.html",
+     {}
+    ]
+   ],
    "css/css-scroll-anchoring/clipped-scrollers-skipped.html": [
     [
      "/css/css-scroll-anchoring/clipped-scrollers-skipped.html",
@@ -345943,6 +345988,12 @@
      {}
     ]
    ],
+   "css/css-scroll-anchoring/exclude-sticky.html": [
+    [
+     "/css/css-scroll-anchoring/exclude-sticky.html",
+     {}
+    ]
+   ],
    "css/css-scroll-anchoring/heuristic-with-offset-update.html": [
     [
      "/css/css-scroll-anchoring/heuristic-with-offset-update.html",
@@ -345961,6 +346012,12 @@
      {}
     ]
    ],
+   "css/css-scroll-anchoring/multicol-fragmented-anchor.html": [
+    [
+     "/css/css-scroll-anchoring/multicol-fragmented-anchor.html",
+     {}
+    ]
+   ],
    "css/css-scroll-anchoring/negative-layout-overflow.html": [
     [
      "/css/css-scroll-anchoring/negative-layout-overflow.html",
@@ -345979,6 +346036,18 @@
      {}
     ]
    ],
+   "css/css-scroll-anchoring/opt-out-inner-table.html": [
+    [
+     "/css/css-scroll-anchoring/opt-out-inner-table.html",
+     {}
+    ]
+   ],
+   "css/css-scroll-anchoring/opt-out-table.html": [
+    [
+     "/css/css-scroll-anchoring/opt-out-table.html",
+     {}
+    ]
+   ],
    "css/css-scroll-anchoring/opt-out.html": [
     [
      "/css/css-scroll-anchoring/opt-out.html",
@@ -347179,6 +347248,96 @@
      {}
     ]
    ],
+   "css/css-tables/parsing/border-collapse-computed.html": [
+    [
+     "/css/css-tables/parsing/border-collapse-computed.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/border-collapse-invalid.html": [
+    [
+     "/css/css-tables/parsing/border-collapse-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/border-collapse-valid.html": [
+    [
+     "/css/css-tables/parsing/border-collapse-valid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/border-spacing-computed.html": [
+    [
+     "/css/css-tables/parsing/border-spacing-computed.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/border-spacing-invalid.html": [
+    [
+     "/css/css-tables/parsing/border-spacing-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/border-spacing-valid.html": [
+    [
+     "/css/css-tables/parsing/border-spacing-valid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/caption-side-computed.html": [
+    [
+     "/css/css-tables/parsing/caption-side-computed.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/caption-side-invalid.html": [
+    [
+     "/css/css-tables/parsing/caption-side-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/caption-side-valid.html": [
+    [
+     "/css/css-tables/parsing/caption-side-valid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/empty-cells-computed.html": [
+    [
+     "/css/css-tables/parsing/empty-cells-computed.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/empty-cells-invalid.html": [
+    [
+     "/css/css-tables/parsing/empty-cells-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/empty-cells-valid.html": [
+    [
+     "/css/css-tables/parsing/empty-cells-valid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/table-layout-computed.html": [
+    [
+     "/css/css-tables/parsing/table-layout-computed.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/table-layout-invalid.html": [
+    [
+     "/css/css-tables/parsing/table-layout-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-tables/parsing/table-layout-valid.html": [
+    [
+     "/css/css-tables/parsing/table-layout-valid.html",
+     {}
+    ]
+   ],
    "css/css-tables/percent-width-ignored-001.tentative.html": [
     [
      "/css/css-tables/percent-width-ignored-001.tentative.html",
@@ -445811,6 +445970,32 @@
      {}
     ]
    ],
+   "webdriver/tests/new_window/new.py": [
+    [
+     "/webdriver/tests/new_window/new.py",
+     {}
+    ]
+   ],
+   "webdriver/tests/new_window/new_tab.py": [
+    [
+     "/webdriver/tests/new_window/new_tab.py",
+     {}
+    ]
+   ],
+   "webdriver/tests/new_window/new_window.py": [
+    [
+     "/webdriver/tests/new_window/new_window.py",
+     {}
+    ]
+   ],
+   "webdriver/tests/new_window/user_prompts.py": [
+    [
+     "/webdriver/tests/new_window/user_prompts.py",
+     {
+      "timeout": "long"
+     }
+    ]
+   ],
    "webdriver/tests/perform_actions/key.py": [
     [
      "/webdriver/tests/perform_actions/key.py",
@@ -570236,6 +570421,10 @@
    "2c46c28dc2190592d242c3260ea5cc28415c16c0",
    "testharness"
   ],
+  "css/css-scroll-anchoring/clamp-negative-overflow.html": [
+   "4f0b5fe9a26766b566672d9b8f9174bcb6857a3d",
+   "testharness"
+  ],
   "css/css-scroll-anchoring/clipped-scrollers-skipped.html": [
    "594cd604f4c5e52afa75894d45931150d0b56b0d",
    "testharness"
@@ -570256,6 +570445,10 @@
    "cea6b61dfe8b60754f656c860fe4d6f2dfff0c18",
    "testharness"
   ],
+  "css/css-scroll-anchoring/exclude-sticky.html": [
+   "2158d39802969be102ff9a20e256a3ae78acb51d",
+   "testharness"
+  ],
   "css/css-scroll-anchoring/heuristic-with-offset-update.html": [
    "7fcbd983ed569025e5f46fe69002ca91e86fd21a",
    "testharness"
@@ -570268,6 +570461,10 @@
    "fa7655bcd8afce189368ac412e094f98ccebbdca",
    "testharness"
   ],
+  "css/css-scroll-anchoring/multicol-fragmented-anchor.html": [
+   "931a88ccbfd261487b2233f0b6292f9c1e2e16e6",
+   "testharness"
+  ],
   "css/css-scroll-anchoring/negative-layout-overflow.html": [
    "e1ce331f1affaf15e312f2c720a38acaa11b60a5",
    "testharness"
@@ -570280,6 +570477,14 @@
    "ec548dc3d65bf3237039924ccdb0347a765f1c46",
    "testharness"
   ],
+  "css/css-scroll-anchoring/opt-out-inner-table.html": [
+   "d5ec0738212f42bd0c01823a115bd73caf8a8cf4",
+   "testharness"
+  ],
+  "css/css-scroll-anchoring/opt-out-table.html": [
+   "83cfef97970b24a8cd03534d0060049769d80e29",
+   "testharness"
+  ],
   "css/css-scroll-anchoring/opt-out.html": [
    "12d46c13f9629472d82a9ffd955d1cf40dbbfe6b",
    "testharness"
@@ -572348,6 +572553,22 @@
    "99d2cfc239fb15f26c58bc1da7c258ae3d6d9fbc",
    "reftest"
   ],
+  "css/css-tables/border-collapse-double-border-notref.html": [
+   "8f4222211d76fb8f6be9cb61a7b9979a3b7b89a7",
+   "support"
+  ],
+  "css/css-tables/border-collapse-double-border.html": [
+   "f7a00756e8154300ebdf3073f9b2e0945cb07eb0",
+   "reftest"
+  ],
+  "css/css-tables/border-conflict-resolution-ref.html": [
+   "f19032171b8a0d8e33a78c1f53388a19c79b757d",
+   "support"
+  ],
+  "css/css-tables/border-conflict-resolution.html": [
+   "7248befef57932b2d849630637051e02b480a361",
+   "reftest"
+  ],
   "css/css-tables/bounding-box-computation-1.html": [
    "4173f399bd7cfec93733552fb85890231d8da9c9",
    "testharness"
@@ -572516,6 +572737,66 @@
    "a8745487b6702b8b8e8ac85bd843014dc296b717",
    "reftest"
   ],
+  "css/css-tables/parsing/border-collapse-computed.html": [
+   "1ad0b6d701a7bbc1b49a9f3d3a34270dbd64ed29",
+   "testharness"
+  ],
+  "css/css-tables/parsing/border-collapse-invalid.html": [
+   "9b10062f0f35be958818ef70345e4ab9df56258d",
+   "testharness"
+  ],
+  "css/css-tables/parsing/border-collapse-valid.html": [
+   "2dc8ae45a3862ba465711ab57dd8f8f7c1af9bab",
+   "testharness"
+  ],
+  "css/css-tables/parsing/border-spacing-computed.html": [
+   "384321fa8ed393923a4175a4844d7b624bda2e53",
+   "testharness"
+  ],
+  "css/css-tables/parsing/border-spacing-invalid.html": [
+   "47fd283ccfb4fabdb73ed0853d3f4942bb54a7c2",
+   "testharness"
+  ],
+  "css/css-tables/parsing/border-spacing-valid.html": [
+   "98bf402fc6ccd0266908da2d6270e5e4af71f670",
+   "testharness"
+  ],
+  "css/css-tables/parsing/caption-side-computed.html": [
+   "ea618891878e195b97374fc460bb02d8c88c0f5c",
+   "testharness"
+  ],
+  "css/css-tables/parsing/caption-side-invalid.html": [
+   "1552e4d241f640681862dc76d0e1b0193fc3c889",
+   "testharness"
+  ],
+  "css/css-tables/parsing/caption-side-valid.html": [
+   "a97683a6f428ad9844f99997c2c6da1156f57304",
+   "testharness"
+  ],
+  "css/css-tables/parsing/empty-cells-computed.html": [
+   "f8f6663c6603b35beefe3dffab2719fa6fba8ccf",
+   "testharness"
+  ],
+  "css/css-tables/parsing/empty-cells-invalid.html": [
+   "4b5bf95dcdcbf9bd904510f35e9fc516b782e24a",
+   "testharness"
+  ],
+  "css/css-tables/parsing/empty-cells-valid.html": [
+   "c3483aafe01d1b4da6ded96f8c66dab39c971a93",
+   "testharness"
+  ],
+  "css/css-tables/parsing/table-layout-computed.html": [
+   "53a43151ed576686759a9e87286dc21a9934276d",
+   "testharness"
+  ],
+  "css/css-tables/parsing/table-layout-invalid.html": [
+   "23a60ca56e75af561cae308e2ce33711a2208c1d",
+   "testharness"
+  ],
+  "css/css-tables/parsing/table-layout-valid.html": [
+   "bf94ed83693de1e49c7396579c4fecd6ffe88bee",
+   "testharness"
+  ],
   "css/css-tables/percent-width-ignored-001.tentative.html": [
    "214eee7152b66a4198a2e81d7d62da9a295b5d98",
    "testharness"
@@ -602321,15 +602602,15 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001-ref.xhtml": [
-   "f09e2a448da8a5466bffd31d505cd90cbc34fcc2",
+   "ef2a0685f25d84ed8cc1f9272a3c59b3ccb3470b",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001a.xhtml": [
-   "56bdd5fe4020ea641aa0c778fc49b500e4de2b6d",
+   "678b7f5096e94c0c78097407e0cf8ad89a2d893f",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001b.xhtml": [
-   "002f20fb3335c7e0cb890dd267f36adeabab4f1b",
+   "faed08350aaec8e20bcad677b71d71f7ea5d0f9b",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-002-ref.xhtml": [
@@ -603125,15 +603406,15 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001-ref.xhtml": [
-   "4619337e75bff1824d83ade9e3926ba592560701",
+   "e3f0276fda17436b653e236b359f5837c9257b40",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001a.xhtml": [
-   "37c9db7a3165c22d12328c3294d71b45a8580dba",
+   "494c35bb68703a67ceb6e15817b221ddf488c13a",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001b.xhtml": [
-   "43c5405647d72d71c10b699e6c390f16b6a0f04a",
+   "468d5150fb33d22e9bf56b23af6b74e87d04dd74",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-002-ref.xhtml": [
@@ -603197,11 +603478,11 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003-ref.xhtml": [
-   "a205a6bad6bbb65895e82cf020ad18268e3c8872",
+   "12064db1a5df2dbe82b214d8bc92ee78dcd0b350",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003.xhtml": [
-   "dd32333e4fb15d51723454af44279db3d7db5896",
+   "8b99455e71590dc294be187f8ebfde6a43d6ed76",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-004-ref.xhtml": [
@@ -681972,6 +682253,26 @@
    "4f2652bba86ce67eb6f6e0c42ee4d2e2685f113e",
    "wdspec"
   ],
+  "webdriver/tests/new_window/__init__.py": [
+   "e16014597cf88f465e910358c27f72381292bd6d",
+   "support"
+  ],
+  "webdriver/tests/new_window/new.py": [
+   "0abdeac614e2d565a4a1c6a4b463a3a08f2721da",
+   "wdspec"
+  ],
+  "webdriver/tests/new_window/new_tab.py": [
+   "fbb249fd78361681fe755f72d14a6879d5725cbf",
+   "wdspec"
+  ],
+  "webdriver/tests/new_window/new_window.py": [
+   "eb4db6729ecaa2c6a8ba92f272c4dee90899e3a2",
+   "wdspec"
+  ],
+  "webdriver/tests/new_window/user_prompts.py": [
+   "0d841468ee48995a4f1b2c71ec7f69adcb37baae",
+   "wdspec"
+  ],
   "webdriver/tests/perform_actions/__init__.py": [
    "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
    "support"
diff --git a/tests/wpt/metadata/css/css-transitions/properties-value-003.html.ini b/tests/wpt/metadata/css/css-transitions/properties-value-003.html.ini
index 95ae1c11729..1b627456814 100644
--- a/tests/wpt/metadata/css/css-transitions/properties-value-003.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/properties-value-003.html.ini
@@ -509,3 +509,27 @@
   [display display(static to absolute) / values]
     expected: FAIL
 
+  [border-bottom-left-radius border-radius(px-px) / events]
+    expected: FAIL
+
+  [border-top-right-radius border-radius(px-px) / events]
+    expected: FAIL
+
+  [border-bottom-right-radius border-radius(px-px) / events]
+    expected: FAIL
+
+  [border-top-right-radius border-radius(px) / events]
+    expected: FAIL
+
+  [border-bottom-left-radius border-radius(px) / events]
+    expected: FAIL
+
+  [border-top-left-radius border-radius(px) / events]
+    expected: FAIL
+
+  [border-bottom-right-radius border-radius(px) / events]
+    expected: FAIL
+
+  [border-top-left-radius border-radius(px-px) / events]
+    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 e1a609649d6..bcd187f508c 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
@@ -3,3 +3,6 @@
   [scroll-behavior: smooth on DIV element]
     expected: FAIL
 
+  [Instant scrolling while doing history navigation.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
index cbded65dd2c..21588fafb55 100644
--- a/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
+++ b/tests/wpt/metadata/encoding/single-byte-decoder.html.ini
@@ -32,7 +32,6 @@
 
 
 [single-byte-decoder.html?XMLHttpRequest]
-  expected: CRASH
   [ISO-8859-2: iso_8859-2:1987 (XMLHttpRequest)]
     expected: FAIL
 
@@ -58,100 +57,7 @@
     expected: FAIL
 
   [windows-1254: iso_8859-9:1989 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1256: cp1256 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: iso88599 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: iso-8859-9 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1258: x-cp1258 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1257: windows-1257 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: windows-1254 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [x-mac-cyrillic: x-mac-ukrainian (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: csisolatin5 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1257: cp1257 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1255: x-cp1255 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1253: windows-1253 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: l5 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: x-cp1254 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: latin5 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1255: cp1255 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: iso-ir-148 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1258: windows-1258 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1255: windows-1255 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1256: x-cp1256 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: iso8859-9 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1253: x-cp1253 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1254: cp1254 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1252: latin1 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1253: cp1253 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1252: x-cp1252 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1252: windows-1252 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1252: us-ascii (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1258: cp1258 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1257: x-cp1257 (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [x-mac-cyrillic: x-mac-cyrillic (XMLHttpRequest)]
-    expected: TIMEOUT
-
-  [windows-1256: windows-1256 (XMLHttpRequest)]
-    expected: TIMEOUT
+    expected: FAIL
 
 
 [single-byte-decoder.html?TextDecoder]
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index dc2e45516de..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/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/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
deleted file mode 100644
index dbea4f293ad..00000000000
--- a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[transition_calc_implicit.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini b/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
new file mode 100644
index 00000000000..14a9e778f39
--- /dev/null
+++ b/tests/wpt/mozilla/meta/mozilla/paint_timing.html.ini
@@ -0,0 +1,4 @@
+[paint_timing.html]
+  [Performance entries observer]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/css/css-scroll-anchoring/clamp-negative-overflow.html b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/clamp-negative-overflow.html
new file mode 100644
index 00000000000..4f0b5fe9a26
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/clamp-negative-overflow.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style type="text/css">
+        #scroller {
+            overflow: scroll;
+            width: 500px;
+            height: 500px;
+        }
+        #anchor {
+            position: relative;
+            width: 100px;
+            height: 100px;
+            margin-top: 100px;
+            margin-bottom: 1000px;
+            background-color: blue;
+        }
+        #positioned {
+            position: absolute;
+            width: 10px;
+            height: 10px;
+            top: -200px;
+            background-color: yellow;
+        }
+    </style>
+</head>
+<body>
+    <div id="scroller">
+        <div id="anchor">
+            <div id="positioned">
+            </div>
+        </div>
+    </div>
+    <script type="text/javascript">
+        test(() => {
+            let scroller = document.querySelector('#scroller');
+            let positioned = document.querySelector('#positioned');
+
+            // Scroll down to select #anchor as an anchor node
+            scroller.scrollTop = 20;
+
+            // Move #positioned downwards, which will move the unclamped scrollable
+            // overflow rect of #anchor downards as well
+            positioned.style.top = '-180px';
+            // To trigger the bug that this regression tests in Gecko, we need
+            // to not take Gecko's relative positioning fast path. To do
+            // this, change the 'left' of #positioned from 'auto' to '0px'.
+            positioned.style.left = '0px';
+
+            // The implementation should clamp the scrollable overflow rect
+            // before the start-edge of the anchor node, and not apply an
+            // adjustment
+            assert_equals(scroller.scrollTop, 20);
+        }, 'scrollable overflow before the start-edge of the anchor node should be clamped');
+    </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-scroll-anchoring/exclude-sticky.html b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/exclude-sticky.html
new file mode 100644
index 00000000000..2158d398029
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/exclude-sticky.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+body { height: 400vh; margin: 0; }
+#sticky, #content { width: 200px; height: 100px; }
+#sticky { position: sticky; left: 100px; top: 50px; }
+#before { height: 50px; }
+#content { margin-top: 100px; }
+
+</style>
+<div id="sticky">sticky</div>
+<div id="before"></div>
+<div id="content">content</div>
+<script>
+
+// Tests that the anchor selection algorithm skips sticky-positioned elements.
+
+test(() => {
+  document.scrollingElement.scrollTop = 150;
+  document.querySelector("#before").style.height = "100px";
+  assert_equals(document.scrollingElement.scrollTop, 200);
+}, "Sticky-positioned headers shouldn't be chosen as scroll anchors (we should use 'content' instead)");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-scroll-anchoring/multicol-fragmented-anchor.html b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/multicol-fragmented-anchor.html
new file mode 100644
index 00000000000..931a88ccbfd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/multicol-fragmented-anchor.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+body { margin: 0; }
+#scroller {
+  overflow: scroll;
+  height: 100px;
+}
+#multicol {
+  margin-top: 20px;
+  height: 200px;
+  columns: 2;
+  column-fill: auto;
+}
+#before {
+  margin-top: 100px;
+  height: 100px;
+}
+#content {
+  height: 10px;
+}
+</style>
+<div id="scroller">
+  <div id="multicol">
+    <div id="fragmented">
+      <div id="before"></div>
+      <div id="content">content</div>
+    </div>
+  </div>
+</div>
+<script>
+
+// Tests a scroll anchor inside of a div fragmented across multicol
+
+test(() => {
+  let scroller = document.querySelector("#scroller");
+  let before = document.querySelector("#before");
+  let content = document.querySelector("#content");
+
+  // Scroll down so that we select a scroll anchor. We should select #content
+  // and not #before, as #before is positioned offscreen in the first column
+  scroller.scrollTop = 10;
+
+  // Increase the height of #before so that it fragments into the second
+  // column and pushes #content down.
+  before.style.height = "110px";
+
+  // We should have anchored to #content and have done an adjustment of 10px
+  assert_equals(scroller.scrollTop, 20);
+}, "An element in a fragmented div should be able to be selected as an anchor node.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-inner-table.html b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-inner-table.html
new file mode 100644
index 00000000000..d5ec0738212
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-inner-table.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+#scroller {
+    height: 200px;
+    overflow: scroll;
+}
+#before { height: 50px; }
+#table-row {
+    display: table-row;
+    overflow-anchor: none;
+    width: 100px;
+    height: 100px;
+}
+#after { margin-bottom: 500px; }
+
+</style>
+<div id="scroller">
+    <div id="before"></div>
+    <div id="table-row">content</div>
+    <div id="after"></div>
+</div>
+<script>
+
+// Tests that the anchor exclusion API works with table parts that generate
+// anonymous table box wrappers
+
+test(() => {
+  let scroller = document.querySelector('#scroller');
+  let before = document.querySelector('#before');
+
+  // Scroll down so that #table-row is the only element in view
+  scroller.scrollTop = 50;
+
+  // Expand #before so that we might perform a scroll adjustment
+  before.style.height = "100px";
+
+  // We shouldn't have selected #table-row as an anchor as it is
+  // 'overflow-anchor: none'
+  assert_equals(scroller.scrollTop, 50);
+}, "A table with anonymous wrappers and 'overflow-anchor: none' shouldn't generate any scroll anchor candidates.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-table.html b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-table.html
new file mode 100644
index 00000000000..83cfef97970
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-scroll-anchoring/opt-out-table.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+#scroller {
+    height: 200px;
+    overflow: scroll;
+}
+#before { height: 50px; }
+#table {
+    display: table;
+    overflow-anchor: none;
+    width: 100px;
+    height: 100px;
+    margin-bottom: 500px;
+}
+
+</style>
+<div id="scroller">
+    <div id="before"></div>
+    <div id="table">content</div>
+</div>
+<script>
+
+// Tests that the anchor exclusion API works with tables
+
+test(() => {
+  let scroller = document.querySelector('#scroller');
+  let before = document.querySelector('#before');
+
+  // Scroll down so that #table is the only element in view
+  scroller.scrollTop = 50;
+
+  // Expand #before so that we might perform a scroll adjustment
+  before.style.height = "100px";
+
+  // We shouldn't have selected #table as an anchor as it is
+  // 'overflow-anchor: none'
+  assert_equals(scroller.scrollTop, 50);
+}, "A table with 'overflow-anchor: none' shouldn't generate any scroll anchor candidates.");
+
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border-notref.html b/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border-notref.html
new file mode 100644
index 00000000000..8f4222211d7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border-notref.html
@@ -0,0 +1,7 @@
+<!doctype html>
+<title>CSS Test Reference</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<table style="border-collapse: collapse; border-style: solid;">
+  <td>Should see a non-solid border</td>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border.html b/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border.html
new file mode 100644
index 00000000000..f7a00756e81
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/border-collapse-double-border.html
@@ -0,0 +1,10 @@
+<!doctype html>
+<title>CSS Test: border-collapsed tables don't unconditionally render double borders as solid</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1521066">
+<link rel="help" href="https://drafts.csswg.org/css2/tables.html#collapsing-borders">
+<link rel="mismatch" href="border-collapse-double-border-notref.html">
+<table style="border-collapse: collapse; border-style: double;">
+  <td>Should see a non-solid border</td>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution-ref.html b/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution-ref.html
new file mode 100644
index 00000000000..f19032171b8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution-ref.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>CSS Test Reference</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<style>
+  table {
+    font-size: 2em;
+    border-collapse: collapse;
+    border: 5px solid green;
+  }
+</style>
+
+<p>You should see no non-solid borders and no red.</p>
+
+<table>
+  <tr>
+    <td colspan="4" style="border: 5px solid purple;">hello</td>
+  </tr>
+  <tr>
+    <td style="border-right: 5px solid blue; border-bottom: 9px hidden red;">one</td>
+    <td style="border-right: 5px solid blue;">two</td>
+    <td>three</td>
+    <td style="border-left: 5px solid blue">four</td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution.html b/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution.html
new file mode 100644
index 00000000000..7248befef57
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/border-conflict-resolution.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>CSS Test: Table border resolution rules</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1520138">
+<link rel="help" href="https://drafts.csswg.org/css2/tables.html#border-conflict-resolution">
+<link rel="match" href="border-conflict-resolution-ref.html">
+<style>
+  table {
+    font-size: 2em;
+    border-collapse: collapse;
+    border: 5px solid green;
+  }
+</style>
+
+<p>You should see no non-solid borders and no red.</p>
+
+<table>
+  <tr>
+    <td colspan="4" style="border: 5px solid purple;">hello</td>
+  </tr>
+  <tr>
+    <td style="border-top: 5px solid blue; border-right: 5px solid blue; border-bottom: 9px hidden red; border-left: 9px none;">one</td>
+    <td style="border-top: 5px dashed blue; border-right: 5px solid blue; border-bottom: 5px outset red;">two</td>
+    <td style="border-top: 5px ridge blue; border-right: 5px ridge red; border-bottom: 5px inset red;">three</td>
+    <td style="border-left: 5px solid blue; border-bottom: 5px dotted red;">four</td>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-computed.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-computed.html
new file mode 100644
index 00000000000..1ad0b6d701a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module: getComputedValue().borderCollapse</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-collapse">
+<meta name="assert" content="border-collapse computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("border-collapse", "separate");
+test_computed_value("border-collapse", "collapse");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-invalid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-invalid.html
new file mode 100644
index 00000000000..9b10062f0f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-invalid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing border-collapse with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-collapse">
+<meta name="assert" content="border-collapse supports only the grammar 'separate | collapse'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("border-collapse", "none");
+test_invalid_value("border-collapse", "separate collapse");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-valid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-valid.html
new file mode 100644
index 00000000000..2dc8ae45a38
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-collapse-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing border-collapse with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-collapse">
+<meta name="assert" content="border-collapse supports the full grammar 'separate | collapse'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("border-collapse", "separate");
+test_valid_value("border-collapse", "collapse");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-computed.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-computed.html
new file mode 100644
index 00000000000..384321fa8ed
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-computed.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module: getComputedValue().borderSpacing</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-spacing">
+<meta name="assert" content="border-spacing computed value is two absolute lengths.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<style>
+  #target {
+    font-size: 40px;
+  }
+</style>
+<script>
+test_computed_value("border-spacing", "10px 20px");
+test_computed_value("border-spacing", "0", "0px 0px");
+test_computed_value("border-spacing", "calc(10px + 0.5em) calc(10px - 0.5em)", "30px 0px");
+test_computed_value("border-spacing", "calc(10px - 0.5em) calc(10px + 0.5em)", "0px 30px");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-invalid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-invalid.html
new file mode 100644
index 00000000000..47fd283ccfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-invalid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing border-spacing with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-spacing">
+<meta name="assert" content="border-spacing supports only the grammar '<length>{1,2}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("border-spacing", "10%");
+test_invalid_value("border-spacing", "-20px");
+test_invalid_value("border-spacing", "30");
+test_invalid_value("border-spacing", "40px 50px 60px");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-valid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-valid.html
new file mode 100644
index 00000000000..98bf402fc6c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/border-spacing-valid.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing border-spacing with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-border-spacing">
+<meta name="assert" content="border-spacing supports the full grammar '<length>{1,2}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("border-spacing", "0px");
+test_valid_value("border-spacing", "10px 20px");
+test_valid_value("border-spacing", "calc(10px + 0.5em) calc(10px - 0.5em)");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-computed.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-computed.html
new file mode 100644
index 00000000000..ea618891878
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module: getComputedValue().captionSide</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-caption-side">
+<meta name="assert" content="caption-side computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("caption-side", "top");
+test_computed_value("caption-side", "bottom");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-invalid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-invalid.html
new file mode 100644
index 00000000000..1552e4d241f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-invalid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing caption-side with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-caption-side">
+<meta name="assert" content="caption-side supports only the grammar 'top | bottom'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("caption-side", "auto");
+test_invalid_value("caption-side", "left");
+test_invalid_value("caption-side", "right");
+test_invalid_value("caption-side", "top bottom");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-valid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-valid.html
new file mode 100644
index 00000000000..a97683a6f42
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/caption-side-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing caption-side with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-caption-side">
+<meta name="assert" content="caption-side supports the full grammar 'top | bottom'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("caption-side", "top");
+test_valid_value("caption-side", "bottom");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-computed.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-computed.html
new file mode 100644
index 00000000000..f8f6663c660
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module: getComputedValue().emptyCells</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-empty-cells">
+<meta name="assert" content="empty-cells computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("empty-cells", "show");
+test_computed_value("empty-cells", "hide");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-invalid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-invalid.html
new file mode 100644
index 00000000000..4b5bf95dcdc
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-invalid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing empty-cells with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-empty-cells">
+<meta name="assert" content="empty-cells supports only the grammar 'show | hide'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("empty-cells", "auto");
+test_invalid_value("empty-cells", "show hide");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-valid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-valid.html
new file mode 100644
index 00000000000..c3483aafe01
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/empty-cells-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing empty-cells with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-empty-cells">
+<meta name="assert" content="empty-cells supports the full grammar 'show | hide'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("empty-cells", "show");
+test_valid_value("empty-cells", "hide");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-computed.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-computed.html
new file mode 100644
index 00000000000..53a43151ed5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-computed.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module: getComputedValue().tableLayout</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-table-layout">
+<meta name="assert" content="table-layout computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("table-layout", "auto");
+test_computed_value("table-layout", "fixed");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-invalid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-invalid.html
new file mode 100644
index 00000000000..23a60ca56e7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-invalid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing table-layout with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-table-layout">
+<meta name="assert" content="table-layout supports only the grammar 'auto | fixed'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("table-layout", "none");
+test_invalid_value("table-layout", "auto fixed");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-valid.html b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-valid.html
new file mode 100644
index 00000000000..bf94ed83693
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/parsing/table-layout-valid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Table Module Test: parsing table-layout with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-tables/#propdef-table-layout">
+<meta name="assert" content="table-layout supports the full grammar 'auto | fixed'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("table-layout", "auto");
+test_valid_value("table-layout", "fixed");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001-ref.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001-ref.xhtml
index f09e2a448da..ef2a0685f25 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001-ref.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001-ref.xhtml
@@ -12,24 +12,24 @@
         width: 200px;
         margin-bottom: 2px;
         background: lightgray;
-        height: 20px;
+        height: 10px;
         clear: all;
       }
       div.a {
         width: 10px;
-        height: 20px;
+        height: 10px;
         background: lightgreen;
         float: left;
       }
       div.b {
         width: 30px;
-        height: 20px;
+        height: 10px;
         background: pink;
         float: left;
       }
       div.c {
         width: 40px;
-        height: 20px;
+        height: 10px;
         background: orange;
         float: left;
       }
@@ -37,7 +37,7 @@
       /* Inside of 'b': */
       div.fixedSizeChild {
         width: 30px;
-        height: 10px;
+        height: 5px;
         background: purple;
       }
     </style>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001a.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001a.xhtml
index 56bdd5fe402..678b7f5096e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001a.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001a.xhtml
@@ -14,7 +14,7 @@
     <style>
       div.flexbox {
         width: 200px;
-        height: 20px; /* Short, to force us to wrap */
+        height: 10px; /* Short, to force us to wrap */
         display: flex;
         flex-direction: column;
         flex-wrap: wrap;
@@ -23,19 +23,19 @@
       }
       div.a {
         width: 10px;
-        height: 20px;
+        height: 10px;
         flex: none;
         background: lightgreen;
       }
       div.b {
         width: auto; /* width comes from contents */
-        height: 20px;
+        height: 10px;
         flex: none;
         background: pink;
       }
       div.c {
         width: 40px;
-        height: 20px;
+        height: 10px;
         flex: none;
         background: orange;
       }
@@ -43,7 +43,7 @@
       /* Inside of 'b': */
       div.fixedSizeChild {
         width: 30px;
-        height: 10px;
+        height: 5px;
         background: purple;
       }
     </style>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001b.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001b.xhtml
index 002f20fb333..faed08350aa 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001b.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-align-content-vert-001b.xhtml
@@ -15,7 +15,7 @@
     <style>
       div.flexbox {
         width: 200px;
-        max-height: 20px; /* Short, to force us to wrap */
+        max-height: 10px; /* Short, to force us to wrap */
         display: flex;
         flex-direction: column;
         flex-wrap: wrap;
@@ -24,19 +24,19 @@
       }
       div.a {
         width: 10px;
-        height: 20px;
+        height: 10px;
         flex: none;
         background: lightgreen;
       }
       div.b {
         width: auto; /* width comes from contents */
-        height: 20px;
+        height: 10px;
         flex: none;
         background: pink;
       }
       div.c {
         width: 40px;
-        height: 20px;
+        height: 10px;
         flex: none;
         background: orange;
       }
@@ -44,7 +44,7 @@
       /* Inside of 'b': */
       div.fixedSizeChild {
         width: 30px;
-        height: 10px;
+        height: 5px;
         background: purple;
       }
     </style>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001-ref.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001-ref.xhtml
index 4619337e75b..e3f0276fda1 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001-ref.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001-ref.xhtml
@@ -16,17 +16,17 @@
         display: inline-block;
       }
       div.a {
-        height: 20px;
+        height: 10px;
         width: 10px;
         background: lightgreen;
       }
       div.b {
-        height: 20px;
+        height: 10px;
         width: 50px;
         background: pink;
       }
       div.c {
-        height: 20px;
+        height: 10px;
         width: 100px;
         background: orange;
       }
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001a.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001a.xhtml
index 37c9db7a316..494c35bb687 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001a.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001a.xhtml
@@ -18,17 +18,17 @@
         margin-bottom: 2px;
       }
       div.a {
-        height: 20px;
+        height: 10px;
         flex: 0 10px;
         background: lightgreen;
       }
       div.b {
-        height: 20px;
+        height: 10px;
         flex: 0 50px;
         background: pink;
       }
       div.c {
-        height: 20px;
+        height: 10px;
         flex: 0 100px;
         background: orange;
       }
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001b.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001b.xhtml
index 43c5405647d..468d5150fb3 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001b.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-horiz-001b.xhtml
@@ -24,17 +24,17 @@
         clear: both;
       }
       div.a {
-        height: 20px;
+        height: 10px;
         flex: 0 10px;
         background: lightgreen;
       }
       div.b {
-        height: 20px;
+        height: 10px;
         flex: 0 50px;
         background: pink;
       }
       div.c {
-        height: 20px;
+        height: 10px;
         flex: 0 100px;
         background: orange;
       }
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003-ref.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003-ref.xhtml
index a205a6bad6b..12064db1a5d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003-ref.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003-ref.xhtml
@@ -15,17 +15,17 @@
         float: left;
       }
       div.a {
-        width: 20px;
+        width: 10px;
         height: 35px;
         background: lightgreen;
       }
       div.b {
-        width: 20px;
+        width: 10px;
         height: 40px;
         background: pink;
       }
       div.c {
-        width: 20px;
+        width: 10px;
         height: 45px;
         background: orange;
       }
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003.xhtml b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003.xhtml
index dd32333e4fb..8b99455e715 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003.xhtml
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-justify-content-vert-003.xhtml
@@ -29,17 +29,17 @@
         float: left;
       }
       div.a {
-        width: 20px;
+        width: 10px;
         flex: 0 0 35px;
         background: lightgreen;
       }
       div.b {
-        width: 20px;
+        width: 10px;
         flex: 0 0 40px;
         background: pink;
       }
       div.c {
-        width: 20px;
+        width: 10px;
         flex: 0 0 45px;
         background: orange;
       }
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/new_window/__init__.py b/tests/wpt/web-platform-tests/webdriver/tests/new_window/__init__.py
new file mode 100644
index 00000000000..e16014597cf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/new_window/__init__.py
@@ -0,0 +1,10 @@
+def opener(session):
+    return session.execute_script("""
+        return window.opener;
+        """)
+
+
+def window_name(session):
+    return session.execute_script("""
+        return window.name;
+        """)
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/new_window/new.py b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new.py
new file mode 100644
index 00000000000..0abdeac614e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new.py
@@ -0,0 +1,52 @@
+import pytest
+
+from webdriver.transport import Response
+
+from tests.support.asserts import assert_error, assert_success
+
+
+def new_window(session, type_hint=None):
+    return session.transport.send(
+        "POST", "session/{session_id}/window/new".format(**vars(session)),
+        {"type": type_hint})
+
+
+def test_null_parameter_value(session, http):
+    path = "/session/{session_id}/window/new".format(**vars(session))
+    with http.post(path, None) as response:
+        assert_error(Response.from_http(response), "invalid argument")
+
+
+def test_no_browsing_context(session, closed_window):
+    response = new_window(session)
+    assert_error(response, "no such window")
+
+
+@pytest.mark.parametrize("type_hint", [True, 42, 4.2, [], {}])
+def test_type_with_invalid_type(session, type_hint):
+    response = new_window(session, type_hint)
+    assert_error(response, "invalid argument")
+
+
+def test_type_with_null_value(session):
+    original_handles = session.handles
+
+    response = new_window(session, type_hint=None)
+    value = assert_success(response)
+    handles = session.handles
+    assert len(handles) == len(original_handles) + 1
+    assert value["handle"] in handles
+    assert value["handle"] not in original_handles
+    assert value["type"] in ["tab", "window"]
+
+
+def test_type_with_unknown_value(session):
+    original_handles = session.handles
+
+    response = new_window(session, type_hint="foo")
+    value = assert_success(response)
+    handles = session.handles
+    assert len(handles) == len(original_handles) + 1
+    assert value["handle"] in handles
+    assert value["handle"] not in original_handles
+    assert value["type"] in ["tab", "window"]
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_tab.py b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_tab.py
new file mode 100644
index 00000000000..fbb249fd783
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_tab.py
@@ -0,0 +1,48 @@
+from tests.support.asserts import assert_success
+
+from . import opener, window_name
+
+
+def new_window(session, type_hint=None):
+    return session.transport.send(
+        "POST", "session/{session_id}/window/new".format(**vars(session)),
+        {"type": type_hint})
+
+
+def test_new_tab(session):
+    original_handles = session.handles
+
+    response = new_window(session, type_hint="tab")
+    value = assert_success(response)
+    handles = session.handles
+    assert len(handles) == len(original_handles) + 1
+    assert value["handle"] in handles
+    assert value["handle"] not in original_handles
+    assert value["type"] == "tab"
+
+
+def test_new_tab_opens_about_blank(session):
+    response = new_window(session, type_hint="tab")
+    value = assert_success(response)
+    assert value["type"] == "tab"
+
+    session.handle = value["handle"]
+    assert session.url == "about:blank"
+
+
+def test_new_tab_sets_no_window_name(session):
+    response = new_window(session, type_hint="tab")
+    value = assert_success(response)
+    assert value["type"] == "tab"
+
+    session.handle = value["handle"]
+    assert window_name(session) == ""
+
+
+def test_new_tab_sets_no_opener(session):
+    response = new_window(session, type_hint="tab")
+    value = assert_success(response)
+    assert value["type"] == "tab"
+
+    session.handle = value["handle"]
+    assert opener(session) is None
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_window.py b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_window.py
new file mode 100644
index 00000000000..eb4db6729ec
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/new_window/new_window.py
@@ -0,0 +1,48 @@
+from tests.support.asserts import assert_success
+
+from . import opener, window_name
+
+
+def new_window(session, type_hint=None):
+    return session.transport.send(
+        "POST", "session/{session_id}/window/new".format(**vars(session)),
+        {"type": type_hint})
+
+
+def test_type_with_window(session):
+    original_handles = session.handles
+
+    response = new_window(session, type_hint="window")
+    value = assert_success(response)
+    handles = session.handles
+    assert len(handles) == len(original_handles) + 1
+    assert value["handle"] in handles
+    assert value["handle"] not in original_handles
+    assert value["type"] == "window"
+
+
+def test_new_window_opens_about_blank(session):
+    response = new_window(session, type_hint="window")
+    value = assert_success(response)
+    assert value["type"] == "window"
+
+    session.handle = value["handle"]
+    assert session.url == "about:blank"
+
+
+def test_new_window_sets_no_window_name(session):
+    response = new_window(session, type_hint="window")
+    value = assert_success(response)
+    assert value["type"] == "window"
+
+    session.handle = value["handle"]
+    assert window_name(session) == ""
+
+
+def test_new_window_sets_no_opener(session):
+    response = new_window(session, type_hint="window")
+    value = assert_success(response)
+    assert value["type"] == "window"
+
+    session.handle = value["handle"]
+    assert opener(session) is None
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/new_window/user_prompts.py b/tests/wpt/web-platform-tests/webdriver/tests/new_window/user_prompts.py
new file mode 100644
index 00000000000..0d841468ee4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webdriver/tests/new_window/user_prompts.py
@@ -0,0 +1,121 @@
+# META: timeout=long
+
+import pytest
+
+from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
+
+
+def new_window(session, type_hint=None):
+    return session.transport.send(
+        "POST", "session/{session_id}/window/new".format(**vars(session)),
+        {"type": type_hint})
+
+
+@pytest.fixture
+def check_user_prompt_closed_without_exception(session, create_dialog):
+    def check_user_prompt_closed_without_exception(dialog_type, retval):
+        original_handles = session.handles
+
+        create_dialog(dialog_type, text=dialog_type)
+
+        response = new_window(session)
+        value = assert_success(response)
+
+        handles = session.handles
+        assert len(handles) == len(original_handles) + 1
+        assert value["handle"] in handles
+        assert value["handle"] not in original_handles
+
+        assert_dialog_handled(session, expected_text=dialog_type, expected_retval=retval)
+
+    return check_user_prompt_closed_without_exception
+
+
+@pytest.fixture
+def check_user_prompt_closed_with_exception(session, create_dialog):
+    def check_user_prompt_closed_with_exception(dialog_type, retval):
+        original_handles = session.handles
+
+        create_dialog(dialog_type, text=dialog_type)
+
+        response = new_window(session)
+        assert_error(response, "unexpected alert open")
+
+        assert_dialog_handled(session, expected_text=dialog_type, expected_retval=retval)
+
+        assert len(session.handles) == len(original_handles)
+
+    return check_user_prompt_closed_with_exception
+
+
+@pytest.fixture
+def check_user_prompt_not_closed_but_exception(session, create_dialog):
+    def check_user_prompt_not_closed_but_exception(dialog_type):
+        original_handles = session.handles
+
+        create_dialog(dialog_type, text=dialog_type)
+
+        response = new_window(session)
+        assert_error(response, "unexpected alert open")
+
+        assert session.alert.text == dialog_type
+        session.alert.dismiss()
+
+        assert len(session.handles) == len(original_handles)
+
+    return check_user_prompt_not_closed_but_exception
+
+
+@pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
+@pytest.mark.parametrize("dialog_type, retval", [
+    ("alert", None),
+    ("confirm", True),
+    ("prompt", ""),
+])
+def test_accept(check_user_prompt_closed_without_exception, dialog_type, retval):
+    check_user_prompt_closed_without_exception(dialog_type, retval)
+
+
+@pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
+@pytest.mark.parametrize("dialog_type, retval", [
+    ("alert", None),
+    ("confirm", True),
+    ("prompt", ""),
+])
+def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
+    check_user_prompt_closed_with_exception(dialog_type, retval)
+
+
+@pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
+@pytest.mark.parametrize("dialog_type, retval", [
+    ("alert", None),
+    ("confirm", False),
+    ("prompt", None),
+])
+def test_dismiss(check_user_prompt_closed_without_exception, dialog_type, retval):
+    check_user_prompt_closed_without_exception(dialog_type, retval)
+
+
+@pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
+@pytest.mark.parametrize("dialog_type, retval", [
+    ("alert", None),
+    ("confirm", False),
+    ("prompt", None),
+])
+def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
+    check_user_prompt_closed_with_exception(dialog_type, retval)
+
+
+@pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
+@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
+def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
+    check_user_prompt_not_closed_but_exception(dialog_type)
+
+
+@pytest.mark.parametrize("dialog_type, retval", [
+    ("alert", None),
+    ("confirm", False),
+    ("prompt", None),
+])
+def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
+    check_user_prompt_closed_with_exception(dialog_type, retval)