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 947e223fb28..3b874fc1748 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
@@ -34,3 +34,6 @@
   [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 2843ff8414b..f692fd6e6cd 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -53774,7 +53774,7 @@
      "css/CSS2/generated-content/content-counter-001.xht",
      [
       [
-       "/css/CSS2/generated-content/content-counter-001-ref.xht",
+       "about:blank",
        "=="
       ]
      ],
@@ -124399,6 +124399,18 @@
      {}
     ]
    ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html",
+     [
+      [
+       "/css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-content-distribution-001.html": [
     [
      "css/css-grid/alignment/grid-content-distribution-001.html",
@@ -125143,6 +125155,18 @@
      {}
     ]
    ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html",
+     [
+      [
+       "/css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-self-alignment-stretch-input-range.html": [
     [
      "css/css-grid/alignment/grid-self-alignment-stretch-input-range.html",
@@ -235815,9 +235839,6 @@
    "css/CSS2/generated-content/content-counter-000-ref.xht": [
     []
    ],
-   "css/CSS2/generated-content/content-counter-001-ref.xht": [
-    []
-   ],
    "css/CSS2/generated-content/content-counter-002-ref.xht": [
     []
    ],
@@ -252033,6 +252054,9 @@
    "css/css-grid/reference/grid-auto-repeat-multiple-values-001-ref.html": [
     []
    ],
+   "css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html": [
+    []
+   ],
    "css/css-grid/reference/grid-different-gutters-ref.html": [
     []
    ],
@@ -252045,6 +252069,9 @@
    "css/css-grid/reference/grid-first-letter-green-margin-no-collapse-ref.html": [
     []
    ],
+   "css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html": [
+    []
+   ],
    "css/css-grid/reference/grid-layout-auto-tracks-ref.html": [
     []
    ],
@@ -281712,9 +281739,6 @@
    "service-workers/service-worker/resources/xslt-pass.xsl": [
     []
    ],
-   "service-workers/tools/blink-import.py": [
-    []
-   ],
    "shadow-dom/META.yml": [
     []
    ],
@@ -318333,6 +318357,48 @@
      {}
     ]
    ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html": [
+    [
+     "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html",
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-column-axis-alignment-positioned-items-001.html": [
     [
      "css/css-grid/alignment/grid-column-axis-alignment-positioned-items-001.html",
@@ -318495,6 +318561,48 @@
      {}
     ]
    ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html",
+     {}
+    ]
+   ],
+   "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html": [
+    [
+     "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html",
+     {}
+    ]
+   ],
    "css/css-grid/alignment/grid-row-axis-alignment-positioned-items-001.html": [
     [
      "css/css-grid/alignment/grid-row-axis-alignment-positioned-items-001.html",
@@ -319989,6 +320097,12 @@
      {}
     ]
    ],
+   "css/css-lists/parsing/content-invalid.html": [
+    [
+     "css/css-lists/parsing/content-invalid.html",
+     {}
+    ]
+   ],
    "css/css-lists/parsing/counter-increment-invalid.html": [
     [
      "css/css-lists/parsing/counter-increment-invalid.html",
@@ -394650,6 +394764,52 @@
      }
     ]
    ],
+   "screen_enumeration/requestDisplays.tentative.https.any.js": [
+    [
+     "screen_enumeration/requestDisplays.tentative.https.any.html",
+     {
+      "script_metadata": [
+       [
+        "global",
+        "window,dedicatedworker,sharedworker,serviceworker"
+       ]
+      ]
+     }
+    ],
+    [
+     "screen_enumeration/requestDisplays.tentative.https.any.serviceworker.html",
+     {
+      "script_metadata": [
+       [
+        "global",
+        "window,dedicatedworker,sharedworker,serviceworker"
+       ]
+      ]
+     }
+    ],
+    [
+     "screen_enumeration/requestDisplays.tentative.https.any.sharedworker.html",
+     {
+      "script_metadata": [
+       [
+        "global",
+        "window,dedicatedworker,sharedworker,serviceworker"
+       ]
+      ]
+     }
+    ],
+    [
+     "screen_enumeration/requestDisplays.tentative.https.any.worker.html",
+     {
+      "script_metadata": [
+       [
+        "global",
+        "window,dedicatedworker,sharedworker,serviceworker"
+       ]
+      ]
+     }
+    ]
+   ],
    "scroll-animations/constructor-no-document.html": [
     [
      "scroll-animations/constructor-no-document.html",
@@ -502574,12 +502734,8 @@
    "328ba64164bc44678f227954914f2ff7e64d1f4b",
    "reftest"
   ],
-  "css/CSS2/generated-content/content-counter-001-ref.xht": [
-   "699c85549f9f0c4f321fb13627047d1226a7b11b",
-   "support"
-  ],
   "css/CSS2/generated-content/content-counter-001.xht": [
-   "98e9980506c0844cce281f49471b08aa35e27254",
+   "8f06e686e124b56fd2b471f72ab0617049d83c39",
    "reftest"
   ],
   "css/CSS2/generated-content/content-counter-002-ref.xht": [
@@ -544819,7 +544975,7 @@
    "testharness"
   ],
   "css/css-box/parsing/margin-computed.html": [
-   "f22f6cdc0f503488418b7741f12ec5554f213477",
+   "6c3b321c720ddf44ad30b43429e20fbad24943be",
    "testharness"
   ],
   "css/css-box/parsing/margin-invalid.html": [
@@ -561894,6 +562050,38 @@
    "c7e65dcc2fb56db1acf0290d326a4db072594a4d",
    "testharness"
   ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html": [
+   "a1cc22a41d3f89045eae41e80adb39387464be66",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html": [
+   "052836c9e9f8069012dbc1e8f0b75c5e4dbd3563",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html": [
+   "6ff7e3d423e6dfcc708083598753fc99ac8b6b8a",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html": [
+   "6d80fac7bdb2c265c9a643720b1df5dee3691e8c",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html": [
+   "f1fd9e22a00f4d6a9595d9d655a01e02be2b9349",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html": [
+   "0ceaf7c62e6ca539840836f95d0d6f9f92e1911d",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html": [
+   "d9b5632f12a49c378f0b0c00d0df2c77fca57edc",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html": [
+   "e757728f7a14bd1dae4952bf000ee8f8449bab74",
+   "reftest"
+  ],
   "css/css-grid/alignment/grid-column-axis-alignment-positioned-items-001.html": [
    "7268b612545e4cbd513ce453489112aaf35b65fc",
    "testharness"
@@ -562250,6 +562438,38 @@
    "e72814725d2cb90fba6f3bd4d1e8370f37382fbb",
    "reftest"
   ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html": [
+   "d1fb13aa491739a8ccf391d8c065c2c117a48ac9",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html": [
+   "f17afa71e3ee859dc5fb33ac6886d9db6e4d1203",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html": [
+   "6500a2961f35d3b31062ba86ea3a395c97e24c7c",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html": [
+   "af9c27e95a19f71f1410106da8ab60581f426b44",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html": [
+   "fdd58c72faa9f101f5e90d78c3d21b252bf6ac1d",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html": [
+   "ea4748f0ed1d742d171bab350f3e96cd659daccb",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html": [
+   "7954e88f987f1ab5bcc4acd45b67ac04b811d558",
+   "testharness"
+  ],
+  "css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html": [
+   "e71e30687ef133d7b9fb661814949f395f80a988",
+   "reftest"
+  ],
   "css/css-grid/alignment/grid-row-axis-alignment-positioned-items-001.html": [
    "967b0e4be967e9b3619e24cdf372aefcfd6b4f24",
    "testharness"
@@ -563882,6 +564102,10 @@
    "0b8ef6d39bf6f01d994f6025f34c0136cc2908cf",
    "support"
   ],
+  "css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html": [
+   "720bf55f2a2d2cb74511da6865739b9ec091d020",
+   "support"
+  ],
   "css/css-grid/reference/grid-different-gutters-ref.html": [
    "57d27ff3aaea88eaeeed6f34f8ac49623b409fd2",
    "support"
@@ -563898,6 +564122,10 @@
    "cf3c6f28b7c93981a4c5ad35147b85cba129d953",
    "support"
   ],
+  "css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html": [
+   "78d199004fb8a78c530d96cb2a138b3aafa205ca",
+   "support"
+  ],
   "css/css-grid/reference/grid-layout-auto-tracks-ref.html": [
    "9f2f91cf7fa0fd3da5b24fe2f72cfdfc8929f4a1",
    "support"
@@ -564139,7 +564367,7 @@
    "testharness"
   ],
   "css/css-images/parsing/object-position-computed.html": [
-   "37b198c52e9a289c5f4ad41a709142cebca81fd7",
+   "97489149e922e3cb0bc5cec88af61afe74fd8f59",
    "testharness"
   ],
   "css/css-images/parsing/object-position-invalid.html": [
@@ -564355,7 +564583,7 @@
    "support"
   ],
   "css/css-inline/inheritance.html": [
-   "7728f67e159eabbcb9dcc87d1a1db1d14b370cb3",
+   "6723c2a6e2ff38cb0af2ab13baf5ef9a9af0f18a",
    "testharness"
   ],
   "css/css-inline/inline-crash-chrome-001.html": [
@@ -565354,6 +565582,10 @@
    "9627ce936ae570325b430a1ac673cd66ae7d4252",
    "reftest"
   ],
+  "css/css-lists/parsing/content-invalid.html": [
+   "54fe99c0f02442c30256692aae83a3cc3a685a06",
+   "testharness"
+  ],
   "css/css-lists/parsing/counter-increment-invalid.html": [
    "262a38d76b57bb786268b42e8a9dc3df5b343f40",
    "testharness"
@@ -614163,7 +614395,7 @@
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/multicol3/reftest.list": [
-   "35102af64b63f93534d41ec1c8dbc4ad25ce6156",
+   "867a23079d7ce12289e74914c677344fb8332568",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/reftest.list": [
@@ -615231,23 +615463,23 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-line-height-tests.py": [
-   "7aa975aaa676811d2c30aac44c1b761da14baac9",
+   "dd823c78a68d555e3a235cd917edd09297f7c34e",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-position-property-tests.py": [
-   "94701b57f2c09d68eeabffb22e1dd0990dc1fada",
+   "62363a207bd15c3d8733ecd496e73e3f61eb5744",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-ruby-tests.py": [
-   "bb2f9706ad28f4bb9880784d945a29e139f0c3c8",
+   "b5c59e6f50185f4a63badfb860375959f3af4a02",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-010-tests.sh": [
-   "3e5667429d1aaf29948fe6319b71daf7d3ed04d9",
+   "0cf60db1b0daff62cc30ab390d0f4cbe6e70edf9",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-tests.py": [
-   "eb14e83bc5777196834cdfbee3c0882568c35931",
+   "34e047ab003e0c515cf03e448796aaa5b23a6df7",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-decoration-propagation-01-ref.html": [
@@ -615267,391 +615499,391 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001-ref.html": [
-   "00c87eeb06255627081dbc819c8b55d8c08a05f4",
+   "43257f99e9c4c1ba1b2e8984900a30f4d06601fe",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001.html": [
-   "2d4676ad709048b7edda384f2a5a5b33032e23ab",
+   "347d2df95c4f06a8e10e40509d6710122def6f76",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001a.html": [
-   "34c817e6815dbeb96407ff1db1fdee7c1a94c838",
+   "f4984d9a286dd63e226ef74c41cec55c04490a29",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001b.html": [
-   "0acb0f7682963bf09e6054255d47bd7b613f517b",
+   "a2bf1ca7ec2ae1c37cdfd7a582b4f5bd192ad4da",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002-ref.html": [
-   "2bcc1d6b9bec29a2234cd485e6c8064b2ddd0558",
+   "345d287395460754bce4b3a750b8ef68e3ced969",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002.html": [
-   "a215267eb5b8318da554f3afcd36955e358076cf",
+   "9d6419b3bbd256da41ea97d66187d70b5812f311",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001-ref.html": [
-   "682acb71542262a9e0cd237552d9c4a39163dbaa",
+   "6f02e05bdd986c5e064060d9685f93acb5fe8b81",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001a.html": [
-   "933d4a427bffaeed8eb6056c7657f6a97e6f4cc0",
+   "ea9589516dc4888f6746e614811c69cafb724d0b",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001b.html": [
-   "58bf9821d54dcd01cf4ee3b194b32e4d336d48af",
+   "d6468cb6c9cd39189b277d344c02e1a6e32be27c",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001z.html": [
-   "81754d8789b26ef490ab74f3e0b3ad45c916861a",
+   "dded6094e35b8b793d648a55be09b44e0bb60b61",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002-ref.html": [
-   "345b1c14614ae7176c23ed731d59ddb0dcb3eae8",
+   "abff3e9e55347e4a476405727fae34e8cb3f2585",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002a.html": [
-   "eebe40d1f6516f24c08765a576f4ec2be33e8195",
+   "f4a47467a155de18f2124008ddf52ce305d4a851",
    "reftest"
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   "pointerevents/pointerevent_pointerout_pen.html": [
-   "a718468c49a965eefee134cc6e6ec4051042cb49",
+   "210055e6539a369461aa30e609489310891570fd",
    "testharness"
   ],
   "pointerevents/pointerevent_pointerout_received_once.html": [
@@ -673878,6 +674110,10 @@
    "e1b50f670105f3a05dacd3518d62770685121c67",
    "support"
   ],
+  "screen_enumeration/requestDisplays.tentative.https.any.js": [
+   "e2a5bc427deb96275a1441141d53e2ffc7f8cd99",
+   "testharness"
+  ],
   "scroll-animations/META.yml": [
    "c53f1f432fe1ec2887e30af396a1f1574b76b95d",
    "support"
@@ -677462,10 +677698,6 @@
    "1d3c36408a66a7785b884c9cdc39dcd2820f9af0",
    "testharness"
   ],
-  "service-workers/tools/blink-import.py": [
-   "552fdc054cc766f13ffe660b1f105b2c9b8c106c",
-   "support"
-  ],
   "shadow-dom/Document-prototype-adoptNode.html": [
    "e9b07d0c8095bf0bf7d40e6d5a09c6f79f6c44fd",
    "testharness"
@@ -696135,7 +696367,7 @@
    "testharness"
   ],
   "webrtc/RTCPeerConnection-iceConnectionState.https.html": [
-   "c0ce25eb76bfe3464863ec42b31842cfbb88b8de",
+   "8e853e4acbc1eee978ce6b482f514b2ac39a1994",
    "testharness"
   ],
   "webrtc/RTCPeerConnection-iceGatheringState.html": [
diff --git a/tests/wpt/metadata/css/CSS2/generated-content/content-counter-001.xht.ini b/tests/wpt/metadata/css/CSS2/generated-content/content-counter-001.xht.ini
new file mode 100644
index 00000000000..64055dd08d9
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/generated-content/content-counter-001.xht.ini
@@ -0,0 +1,2 @@
+[content-counter-001.xht]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-images/parsing/object-position-computed.html.ini b/tests/wpt/metadata/css/css-images/parsing/object-position-computed.html.ini
index 85af7e8b5b0..c0556d12e5d 100644
--- a/tests/wpt/metadata/css/css-images/parsing/object-position-computed.html.ini
+++ b/tests/wpt/metadata/css/css-images/parsing/object-position-computed.html.ini
@@ -44,3 +44,6 @@
   [Property object-position value 'right 30% top 60px' computes to '70% 60px']
     expected: FAIL
 
+  [Property object-position value 'right 20px bottom 10px' computes to 'calc(100% - 20px) calc(100% - 10px)']
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e274..00000000000
--- a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index a3dc44b47ff..59fb2735072 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -324,9 +324,18 @@
   [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index d2df9b78483..e67f0406fc3 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,6 +53,3 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index a639f15230c..b7052af5b5c 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
-  [Content-Type-Options%3A%20nosniff]
+  [X-Content-Type-Options%3A%0D%0AX-Content-Type-Options%3A%20nosniff]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 00000000000..75d75b4cda2
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
index e02f179ec25..bf50d59df41 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
@@ -1,24 +1,5 @@
 [open-features-negative-innerwidth-innerheight.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `innerwidth`, `innerheight`]
     expected: FAIL
 
-  [features "innerheight=-404.5" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "innerwidth=-404.5" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [features "innerwidth=-404" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [features "innerheight=-404e1" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "innerheight=-404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "innerwidth=-404e1" should NOT set "width=404"]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
index 23eefb8eaf9..e150c9d848f 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
@@ -1,24 +1,5 @@
 [open-features-negative-screenx-screeny.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `screenx`, `screeny`]
     expected: FAIL
 
-  [features "screenx=-204" should NOT set "left=204"]
-    expected: TIMEOUT
-
-  [features "screeny=-204" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "screeny=-204.5" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "screeny=-0" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "screenx=-0" should NOT set "left=204"]
-    expected: TIMEOUT
-
-  [features "screenx=-204.5" should NOT set "left=204"]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
index 940516ddd33..ad8840fbb68 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
@@ -1,24 +1,5 @@
 [open-features-negative-top-left.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `top`, `left`]
     expected: FAIL
 
-  [features "top=-204" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "top=-204.5" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "left=-204" should NOT set "left=204"]
-    expected: TIMEOUT
-
-  [features "top=-0" should NOT set "top=204"]
-    expected: TIMEOUT
-
-  [features "left=-204.5" should NOT set "left=204"]
-    expected: TIMEOUT
-
-  [features "left=-0" should NOT set "left=204"]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
index 9027336b453..d1ed9088b2b 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
@@ -1,24 +1,5 @@
 [open-features-negative-width-height.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `width`, `height`]
     expected: FAIL
 
-  [features "height=-404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "height=-404e1" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "height=-404.5" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "width=-404" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [features "width=-404e1" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [features "width=-404.5" should NOT set "width=404"]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
index 4e44584b123..a70e9dbad4d 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
@@ -1,48 +1,32 @@
 [open-features-non-integer-height.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `height`]
     expected: FAIL
 
   [features "height=405*3" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405.32" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405e1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405/5" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405^4" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405.5" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405e-1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405  " should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "height=405LLl" should set "height=405"]
-    expected: TIMEOUT
-
-  [features "height=/404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [top=0,left=0,width=401,: absence of feature "height" should be treated same as "height=0"]
-    expected: TIMEOUT
-
-  [top=0,left=0: absence of feature "height" should be treated same as "height=0"]
-    expected: TIMEOUT
-
-  [features "height=_404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "height=L404" should NOT set "height=404"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
index fcaeae5336d..779531b4a98 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
@@ -1,42 +1,32 @@
 [open-features-non-integer-innerheight.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerheight`]
     expected: FAIL
 
   [features "innerheight=405e-1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405LLl" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405^4" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405e1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405  " should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405/5" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405.32" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405.5" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "innerheight=405*3" should set "height=405"]
-    expected: TIMEOUT
-
-  [features "innerheight=_404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "innerheight=L404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "innerheight=/404" should NOT set "height=404"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
index a8e4fe06618..caba4124f0b 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
@@ -1,42 +1,32 @@
 [open-features-non-integer-left.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `left`]
     expected: FAIL
 
   [features "left=105e1" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105  " should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105/5" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105e-1" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105^4" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105LLl" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105.32" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105*3" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "left=105.5" should set "left=105"]
-    expected: TIMEOUT
-
-  [features "left=L104" should NOT set "left=104"]
-    expected: TIMEOUT
-
-  [features "left=/104" should NOT set "left=104"]
-    expected: TIMEOUT
-
-  [features "left=_104" should NOT set "left=104"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
index 64a08faf0e6..9ace8a4cbdb 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
@@ -1,42 +1,32 @@
 [open-features-non-integer-screenx.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screenx`]
     expected: FAIL
 
   [features "screenx=105.5" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105e1" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105  " should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105*3" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105e-1" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105^4" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105LLl" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105/5" should set "left=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screenx=105.32" should set "left=105"]
-    expected: TIMEOUT
-
-  [features "screenx=_104" should NOT set "left=104"]
-    expected: TIMEOUT
-
-  [features "screenx=L104" should NOT set "left=104"]
-    expected: TIMEOUT
-
-  [features "screenx=/104" should NOT set "left=104"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
index 4f22ef4ef29..a82bd0f981a 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
@@ -1,42 +1,32 @@
 [open-features-non-integer-screeny.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screeny`]
     expected: FAIL
 
   [features "screeny=405^4" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405e-1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405LLl" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405e1" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405  " should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405/5" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405*3" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405.32" should set "height=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "screeny=405.5" should set "height=405"]
-    expected: TIMEOUT
-
-  [features "screeny=_404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "screeny=L404" should NOT set "height=404"]
-    expected: TIMEOUT
-
-  [features "screeny=/404" should NOT set "height=404"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
index 8540f53d8d6..10f617db69e 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
@@ -1,42 +1,32 @@
 [open-features-non-integer-top.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `top`]
     expected: FAIL
 
   [features "top=105/5" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105*3" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105LLl" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105e-1" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105.32" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105e1" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105  " should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105^4" should set "top=105"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "top=105.5" should set "top=105"]
-    expected: TIMEOUT
-
-  [features "top=/104" should NOT set "top=104"]
-    expected: TIMEOUT
-
-  [features "top=_104" should NOT set "top=104"]
-    expected: TIMEOUT
-
-  [features "top=L104" should NOT set "top=104"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
index 9d841e61bc0..28f93ee71b5 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
@@ -1,48 +1,32 @@
 [open-features-non-integer-width.html]
   type: testharness
-  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `width`]
     expected: FAIL
 
   [features "width=405^4" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405.5" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405e1" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405  " should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405.32" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405LLl" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405*3" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405e-1" should set "width=405"]
-    expected: TIMEOUT
+    expected: FAIL
 
   [features "width=405/5" should set "width=405"]
-    expected: TIMEOUT
-
-  [top=0,left=0: absence of feature "width" should be treated same as "width=0"]
-    expected: TIMEOUT
-
-  [features "width=_404" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [top=0,left=0,height=401,: absence of feature "width" should be treated same as "width=0"]
-    expected: TIMEOUT
-
-  [features "width=/404" should NOT set "width=404"]
-    expected: TIMEOUT
-
-  [features "width=L404" should NOT set "width=404"]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/idlharness.https.html.ini b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
index 3de3d614305..9b0587ec407 100644
--- a/tests/wpt/metadata/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
@@ -1541,6 +1541,9 @@
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "textBaseline" with the proper type]
     expected: FAIL
 
+  [SVGElement interface: attribute autofocus]
+    expected: FAIL
+
 
 [idlharness.https.html?include=(Document|Window)]
   [Document interface: documentWithHandlers must inherit property "queryCommandEnabled(DOMString)" with the proper type]
@@ -5178,3 +5181,9 @@
   [HTMLMarqueeElement interface: document.createElement("marquee") must inherit property "onstart" with the proper type]
     expected: FAIL
 
+  [HTMLElement interface: document.createElement("noscript") must inherit property "autofocus" with the proper type]
+    expected: FAIL
+
+  [HTMLElement interface: attribute autofocus]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
index 702af61a3c4..127392316de 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
@@ -1,11 +1,7 @@
 [form-submission-algorithm.html]
-  expected: TIMEOUT
   [If form's firing submission events is true, then return; 'submit' event]
     expected: FAIL
 
   [If form's firing submission events is true, then return; 'invalid' event]
     expected: FAIL
 
-  [Cannot navigate (after constructing the entry list)]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index a56bad443a2..66bd350083b 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,5 +1,4 @@
 [realtimeanalyser-fft-scaling.html]
-  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index 8043387d873..e04c9e468b2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -41,3 +41,6 @@
   [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[30\]\t1.9724091887474060e-1\t9.5236867666244507e-1\t7.5512775778770447e-1\t7.9289436569253091e-1\t3.8985999999999999e-3\n\t[60\]\t-2.2450675070285797e-1\t-5.8084785938262939e-1\t3.5634110867977142e-1\t6.1348441407448528e-1\t3.8985999999999999e-3\n\t[90\]\t-3.7808802723884583e-1\t-5.9811043739318848e-1\t2.2002241015434265e-1\t3.6786251568070089e-1\t3.8985999999999999e-3\n\t[120\]\t7.6881676912307739e-1\t9.4563448429107666e-1\t1.7681771516799927e-1\t1.8698315057805445e-1\t3.8985999999999999e-3\n\t[151\]\t5.4644601186737418e-4\t-4.1306272149085999e-2\t4.1852718160953373e-2\t1.0132291292202573e+0\t3.8985999999999999e-3\n\t...and 1419 more errors.\n\tMax AbsError of 3.1438349926352423e+11 at index of 20238.\n\t[20238\]\t-3.1438349926400000e+11\t-4.7574958205223083e-1\t3.1438349926352423e+11\t6.6081718434175989e+11\t3.8985999999999999e-3\n\tMax RelError of 6.6081718434175989e+11 at index of 20238.\n\t[20238\]\t-3.1438349926400000e+11\t-4.7574958205223083e-1\t3.1438349926352423e+11\t6.6081718434175989e+11\t3.8985999999999999e-3\n]
     expected: FAIL
 
+  [X SNR (19.516378895113107 dB) is not greater than or equal to 65.737. Got 19.516378895113107.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
new file mode 100644
index 00000000000..80f9a4f15b8
--- /dev/null
+++ b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
@@ -0,0 +1,2 @@
+[Worker-constructor.html]
+  expected: ERROR
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
new file mode 100644
index 00000000000..dbea4f293ad
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
@@ -0,0 +1,2 @@
+[transition_calc_implicit.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001-ref.xht b/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001-ref.xht
deleted file mode 100644
index 699c85549f9..00000000000
--- a/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001-ref.xht
+++ /dev/null
@@ -1,43 +0,0 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-<title>CSS Reftest Reference</title>
-<link rel="author" title="Ms2ger" href="mailto:Ms2ger@gmail.com"/>
-<style type="text/css">
-body {
-  white-space: nowrap;
-}
-</style>
-</head>
-<body>
-<p>The following two lines should look the same:</p>
-<div>
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-</div>
-<div>
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-z
-</div>
-</body>
-</html>
diff --git a/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001.xht b/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001.xht
index 98e9980506c..8f06e686e12 100644
--- a/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001.xht
+++ b/tests/wpt/web-platform-tests/css/CSS2/generated-content/content-counter-001.xht
@@ -6,7 +6,7 @@
   <link rel="help" href="http://www.w3.org/TR/CSS21/generate.html#propdef-content"/>
   <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#counter"/>
   <link rel="help" href="http://www.w3.org/TR/CSS21/generate.html#counter-styles"/>
-  <link rel="match" href="content-counter-001-ref.xht"/>
+  <link rel="match" href="about:blank"/>
   <style type="text/css">
 
   body { white-space: nowrap; }
@@ -20,8 +20,6 @@
  </head>
  <body>
 
- <p>The following two lines should look the same:</p>
-
  <div id="test">
    <span></span>
    <span></span>
@@ -37,20 +35,5 @@
    <span></span>
  </div>
 
- <div>
-   z
-   z
-   z
-   z
-   z
-   z
-   z
-   z
-   z
-   z
-   z
-   z
- </div>
-
  </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-box/parsing/margin-computed.html b/tests/wpt/web-platform-tests/css/css-box/parsing/margin-computed.html
index f22f6cdc0f5..6c3b321c720 100644
--- a/tests/wpt/web-platform-tests/css/css-box/parsing/margin-computed.html
+++ b/tests/wpt/web-platform-tests/css/css-box/parsing/margin-computed.html
@@ -23,14 +23,23 @@
   <div id="target"></div>
 </div>
 <script>
+const target = document.getElementById("target");
+
 test_computed_value("margin", "10px");
 test_computed_value("margin", "10px 20px 30px 40px");
 test_computed_value("margin", "calc(0.5em + 10px)", "30px");
 test_computed_value("margin", "30%", "60px");
 
+// Since what should the margin be in presence of other margins is a bit
+// unclear (https://github.com/w3c/csswg-drafts/issues/2328), reset the margin
+// before testing.
+target.style.margin = "0";
 test_computed_value("margin-top", "10px");
+target.style.margin = "0";
 test_computed_value("margin-right", "20px");
+target.style.margin = "0";
 test_computed_value("margin-bottom", "30px");
+target.style.margin = "0";
 test_computed_value("margin-left", "40px");
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html
new file mode 100644
index 00000000000..a1cc22a41d3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-001.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 300px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      background: green;
+      width: 25px;
+      height: 50px;
+  }
+  #item2 {
+      background: blue;
+      width: 25px;
+      height: 100px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "75");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+
+    grid.style.height = "300px";
+
+    item1.setAttribute("data-offset-y", "35");
+    item2.setAttribute("data-offset-y", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html
new file mode 100644
index 00000000000..052836c9e9f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-002.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid item's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 300px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      background: green;
+      width: 25px;
+      height: 50px;
+  }
+  #item2 {
+      background: blue;
+      width: 25px;
+      height: 100px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "75");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+
+    item1.style.height = "100px";
+
+    item1.setAttribute("data-offset-y", "50");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html
new file mode 100644
index 00000000000..6ff7e3d423e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-003.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid items's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 300px;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 300px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      background: green;
+      width: 25px;
+      height: 50px;
+  }
+  #item2 {
+      background: blue;
+      width: 25px;
+      height: 100px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "75");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+
+    item1.style.height = "100px";
+
+    item1.setAttribute("data-offset-y", "50");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html
new file mode 100644
index 00000000000..6d80fac7bdb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-004.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 300px;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: min-content;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      background: green;
+      width: 25px;
+      height: 50px;
+  }
+  #item2 {
+      background: blue;
+      width: 25px;
+      height: 100px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "75");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+
+    grid.style.height = "300px";
+
+    item1.setAttribute("data-offset-y", "35");
+    item2.setAttribute("data-offset-y", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html
new file mode 100644
index 00000000000..f1fd9e22a00
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-005.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid item's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 300px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 10px/1 Ahem;
+      color: blue;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1">XXXXX</div>
+    <div id="item2">XXXXX</div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "90");
+    item2.setAttribute("data-offset-y", "345");
+    checkLayout('#grid');
+
+    item2.style.fontSize = "40px";
+
+    item1.setAttribute("data-offset-y", "90");
+    item2.setAttribute("data-offset-y", "330");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html
new file mode 100644
index 00000000000..0ceaf7c62e6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-006.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid item's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      font: 10px/1 Ahem;
+      grid-template-columns: 100px;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 300px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      color: green;
+  }
+  #item2 {
+      color: blue;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1">XXXXX</div>
+    <div id="item2">XXXXX</div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "95");
+    item2.setAttribute("data-offset-y", "345");
+    checkLayout('#grid');
+
+    grid.style.fontSize = "40px";
+
+    item1.setAttribute("data-offset-y", "80");
+    item2.setAttribute("data-offset-y", "330");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html
new file mode 100644
index 00000000000..d9b5632f12a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-007.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed whenever the grid's height changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-rows: 40% 60%;
+      height: 500px;
+      width: 200px;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      background: green;
+      width: 25px;
+      height: 50px;
+  }
+  #item2 {
+      background: blue;
+      width: 25px;
+      height: 100px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-y", "75");
+    item2.setAttribute("data-offset-y", "300");
+    checkLayout('#grid');
+
+    grid.style.height = "300px";
+
+    item1.setAttribute("data-offset-y", "35");
+    item2.setAttribute("data-offset-y", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html
new file mode 100644
index 00000000000..e757728f7a1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-block-axis-alignment-auto-margins-008.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized rows</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<link rel="match" href="../reference/grid-block-axis-alignment-auto-margins-008-ref.html">
+<meta name="assert" content="The 'top' and 'bottom' margins must be recomputed after the grid's intrinsic size is determined.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: auto;
+      grid-template-rows: 40% 60%;
+      height: 50vh;
+      width: auto;
+  }
+  #grid div {
+    margin: auto 0px auto 0px;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 40px/1 Ahem;
+      color: blue;
+  }
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div id="grid">
+    <div id="item1">XXX</div>
+    <div id="item2">XXXXX</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html
new file mode 100644
index 00000000000..d1fb13aa491
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-001.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      height: 30vh;
+      width: 500px;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      background: green;
+      width: 50px;
+      height: 25px;
+  }
+  #item2 {
+      background: blue;
+      width: 100px;
+      height: 25px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "75");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+
+    grid.style.width = "300px";
+
+    item1.setAttribute("data-offset-x", "35");
+    item2.setAttribute("data-offset-x", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html
new file mode 100644
index 00000000000..f17afa71e3e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-002.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid item's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      height: 30vh;
+      width: 500px;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      background: green;
+      width: 50px;
+      height: 25px;
+  }
+  #item2 {
+      background: blue;
+      width: 100px;
+      height: 25px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "75");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+
+    item1.style.width = "100px";
+
+    item1.setAttribute("data-offset-x", "50");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html
new file mode 100644
index 00000000000..6500a2961f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-003.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid items's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 300px;
+      height: 400px;
+      width: 500px;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      background: green;
+      width: 50px;
+      height: 25px;
+  }
+  #item2 {
+      background: blue;
+      width: 100px;
+      height: 25px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "75");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+
+    item1.style.width = "100px";
+
+    item1.setAttribute("data-offset-x", "50");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html
new file mode 100644
index 00000000000..af9c27e95a1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-004.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 300px;
+      height: auto;
+      width: 500px;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      background: green;
+      width: 50px;
+      height: 25px;
+  }
+  #item2 {
+      background: blue;
+      width: 100px;
+      height: 25px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "75");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+
+    grid.style.width = "300px";
+
+    item1.setAttribute("data-offset-x", "35");
+    item2.setAttribute("data-offset-x", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html
new file mode 100644
index 00000000000..fdd58c72faa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-005.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid items's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 100px;
+      height: 200px;
+      width: 500px;
+      align-items: start;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 10px/1 Ahem;
+      color: blue;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1">XXXXX</div>
+    <div id="item2">XXXXX</div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "50");
+    item2.setAttribute("data-offset-x", "325");
+    checkLayout('#grid');
+
+    item2.style.fontSize = "30px";
+
+    item1.setAttribute("data-offset-x", "50");
+    item2.setAttribute("data-offset-x", "275");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html
new file mode 100644
index 00000000000..ea4748f0ed1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-006.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid items's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      font: 10px/1 Ahem;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 100px;
+      height: auto;
+      width: 500px;
+      align-items: start;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      color: green;
+  }
+  #item2 {
+      color: blue;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1">XXXX</div>
+    <div id="item2">XX</div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "80");
+    item2.setAttribute("data-offset-x", "340");
+    checkLayout('#grid');
+
+    grid.style.fontSize = "25px";
+
+    item1.setAttribute("data-offset-x", "50");
+    item2.setAttribute("data-offset-x", "325");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html
new file mode 100644
index 00000000000..7954e88f987
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-007.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed whenever the grid's width changes.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      height: 200px;
+      width: 500px;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      background: green;
+      width: 50px;
+      height: 25px;
+  }
+  #item2 {
+      background: blue;
+      width: 100px;
+      height: 25px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id="grid">
+    <div id="item1"></div>
+    <div id="item2"></div>
+</div>
+<script>
+    item1.setAttribute("data-offset-x", "75");
+    item2.setAttribute("data-offset-x", "300");
+    checkLayout('#grid');
+
+    grid.style.width = "300px";
+
+    item1.setAttribute("data-offset-x", "35");
+    item2.setAttribute("data-offset-x", "160");
+    checkLayout('#grid');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html
new file mode 100644
index 00000000000..e71e30687ef
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/alignment/grid-inline-axis-alignment-auto-margins-008.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Aligning grid items using 'auto' margins and relative sized columns</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="10.2 Aligning with auto margins" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<link rel="match" href="../reference/grid-inline-axis-alignment-auto-margins-008-ref.html">
+<meta name="assert" content="The 'left' and 'right' margins must be recomputed after the grid's intrinsic size is determined.">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 100px;
+      height: 200px;
+      width: auto;
+      align-items: start;
+  }
+  #grid div {
+    margin: 0px auto 0px auto;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 40px/1 Ahem;
+      color: blue;
+  }
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div id="grid">
+    <div id="item1">XXX</div>
+    <div id="item2">XXXXX</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html
new file mode 100644
index 00000000000..720bf55f2a2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-block-axis-alignment-auto-margins-008-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Reference: Aligning grid items using 'auto' margins</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 100px;
+      grid-template-rows: 40% 60%;
+      height: 50vh;
+      width: auto;
+      align-items: center;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 40px/1 Ahem;
+      color: blue;
+  }
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div id="grid">
+    <div id="item1">XXX</div>
+    <div id="item2">XXXXX</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html
new file mode 100644
index 00000000000..78d199004fb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-inline-axis-alignment-auto-margins-008-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Reference: Aligning grid items using 'auto' margins</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<style>
+  #grid {
+      display: grid;
+      position: relative;
+      background: grey;
+      grid-template-columns: 40% 60%;
+      grid-template-rows: 100px;
+      height: 200px;
+      width: auto;
+      justify-items: center;
+      align-items: start;
+  }
+  #item1 {
+      font: 20px/1 Ahem;
+      color: green;
+  }
+  #item2 {
+      font: 40px/1 Ahem;
+      color: blue;
+  }
+</style>
+<p>The test passes if it has the same visual effect as reference.</p>
+<div id="grid">
+    <div id="item1">XXX</div>
+    <div id="item2">XXXXX</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-images/parsing/object-position-computed.html b/tests/wpt/web-platform-tests/css/css-images/parsing/object-position-computed.html
index 37b198c52e9..97489149e92 100644
--- a/tests/wpt/web-platform-tests/css/css-images/parsing/object-position-computed.html
+++ b/tests/wpt/web-platform-tests/css/css-images/parsing/object-position-computed.html
@@ -26,6 +26,7 @@ test_computed_value("object-position", "right 40%", "100% 40%");
 test_computed_value("object-position", "center top", "50% 0%");
 test_computed_value("object-position", "center", "50% 50%");
 test_computed_value("object-position", "center center", "50% 50%");
+test_computed_value("object-position", "right 20px bottom 10px", "calc(100% - 20px) calc(100% - 10px)");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-inline/inheritance.html b/tests/wpt/web-platform-tests/css/css-inline/inheritance.html
index 7728f67e159..6723c2a6e2f 100644
--- a/tests/wpt/web-platform-tests/css/css-inline/inheritance.html
+++ b/tests/wpt/web-platform-tests/css/css-inline/inheritance.html
@@ -23,6 +23,8 @@ assert_not_inherited('initial-letters', 'normal', '2 3');
 assert_inherited('initial-letters-align', 'alphabetic', 'hanging');
 assert_inherited('initial-letters-wrap', 'none', 'grid');
 assert_not_inherited('initial-sizing', 'normal', 'stretch');
+// https://www.w3.org/TR/CSS2/visudet.html#propdef-line-height
+assert_inherited('line-height', 'normal', '20px');
 assert_not_inherited('vertical-align', 'baseline', '10px');
 </script>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-lists/parsing/content-invalid.html b/tests/wpt/web-platform-tests/css/css-lists/parsing/content-invalid.html
new file mode 100644
index 00000000000..54fe99c0f02
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-lists/parsing/content-invalid.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Lists: parsing counter()/counters() values for the 'content' property</title>
+<link rel="help" href="https://drafts.csswg.org/css-lists-3/#counter-functions">
+<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('content', 'counter(foo, none)');
+test_invalid_value('content', 'counters(foo, "", none)');
+test_invalid_value('content', 'counter(foo, unset)');
+test_invalid_value('content', 'counters(foo, "", unset)');
+test_invalid_value('content', 'counter(foo, initial)');
+test_invalid_value('content', 'counters(foo, "", initial)');
+test_invalid_value('content', 'counter(foo, inherit)');
+test_invalid_value('content', 'counters(foo, "", inherit)');
+
+test_invalid_value('content', '"z" counter(foo, none)');
+test_invalid_value('content', '"z" counters(foo, "", none)');
+test_invalid_value('content', '"z" counter(foo, unset)');
+test_invalid_value('content', '"z" counters(foo, "", unset)');
+test_invalid_value('content', '"z" counter(foo, initial)');
+test_invalid_value('content', '"z" counters(foo, "", initial)');
+test_invalid_value('content', '"z" counter(foo, inherit)');
+test_invalid_value('content', '"z" counters(foo, "", inherit)');
+
+test_invalid_value('content', 'counter(foo, none) "z"');
+test_invalid_value('content', 'counters(foo, "", none) "z"');
+test_invalid_value('content', 'counter(foo, unset) "z"');
+test_invalid_value('content', 'counters(foo, "", unset) "z"');
+test_invalid_value('content', 'counter(foo, initial) "z"');
+test_invalid_value('content', 'counters(foo, "", initial) "z"');
+test_invalid_value('content', 'counter(foo, inherit) "z"');
+test_invalid_value('content', 'counters(foo, "", inherit) "z"');
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/multicol3/reftest.list b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/multicol3/reftest.list
index 35102af64b6..867a23079d7 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/multicol3/reftest.list
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/multicol3/reftest.list
@@ -1,3 +1,9 @@
 == broken-column-rule-1.html broken-column-rule-1-ref.html
 == moz-multicol3-column-balancing-break-inside-avoid-1.html moz-multicol3-column-balancing-break-inside-avoid-1-ref.html
 == multicol-height-002.xht reference/multicol-height-002.xht
+
+# The following lines are duplicates of other lines from further up in this
+# manifest. They're listed again here so we can re-run these tests with
+# column-span enabled. These lines can be removed once the pref becomes
+# default-enabled (Bug 1426010).
+== broken-column-rule-1.html broken-column-rule-1-ref.html
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-line-height-tests.py b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-line-height-tests.py
index 7aa975aaa67..dd823c78a68 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-line-height-tests.py
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-line-height-tests.py
@@ -13,6 +13,8 @@ from __future__ import unicode_literals
 TEST_FILE = 'text-emphasis-line-height-{:03}{}.html'
 TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, {pos}, {wm}, {tag}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -26,12 +28,14 @@ TEST_TEMPLATE = '''<!DOCTYPE html>
 REF_FILE = 'text-emphasis-line-height-{:03}-ref.html'
 REF_TEMPLATE='''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Reference: text-emphasis line height, {pos}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt {{ font-variant-east-asian: inherit; }} </style>
 <p>Pass if the emphasis marks are {dir} the black line:</p>
-<div style="line-height: 1; border-{pos}: 1px solid black; writing-mode: {wm}; ruby-position: {posval}"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 1; border-{pos}: 1px solid black; writing-mode: {wm}; ruby-position: {posval}"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
 '''
 
 STYLE1 = 'line-height: 1; border-{pos}: 1px solid black; ' + \
@@ -40,8 +44,8 @@ STYLE2 = 'text-emphasis: circle;'
 
 TAGS = [
     # (tag, start, end)
-    ('div', '<div style="{style1}{style2}">', '</div>'),
-    ('span', '<div style="{style1}"><span style="{style2}">', '</span></div>'),
+    ('div', '<div lang="ja" style="{style1}{style2}">', '</div>'),
+    ('span', '<div lang="ja" style="{style1}"><span style="{style2}">', '</span></div>'),
     ]
 POSITIONS = [
     # pos, text-emphasis-position, ruby-position,
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-position-property-tests.py b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-position-property-tests.py
index 94701b57f2c..62363a207bd 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-position-property-tests.py
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-position-property-tests.py
@@ -17,6 +17,8 @@ TEST_FILE = 'text-emphasis-position-property-{:03}{}.html'
 REF_FILE = 'text-emphasis-position-property-{:03}-ref.html'
 TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: {value}, {title}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -24,7 +26,7 @@ TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta name="assert" content="'text-emphasis-position: {value}' with 'writing-mode: {wm}' puts emphasis marks {position} the text.">
 <link rel="match" href="text-emphasis-position-property-{index:03}-ref.html">
 <p>Pass if the emphasis marks are {position} the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: {wm}; text-orientation: {orient}; text-emphasis-position: {value}">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: {wm}; text-orientation: {orient}; text-emphasis-position: {value}">試験テスト</div>
 '''
 
 SUFFIXES = ['', 'a', 'b', 'c', 'd', 'e', 'f', 'g']
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-ruby-tests.py b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-ruby-tests.py
index bb2f9706ad2..b5c59e6f501 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-ruby-tests.py
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-ruby-tests.py
@@ -12,6 +12,8 @@ from __future__ import unicode_literals
 TEST_FILE = 'text-emphasis-ruby-{:03}{}.html'
 TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, {wm}, {pos}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -19,18 +21,20 @@ TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-{index:03}-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: {wm}; ruby-position: {ruby_pos}; text-emphasis-position: {posval}">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: {wm}; ruby-position: {ruby_pos}; text-emphasis-position: {posval}">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
 '''
 
 REF_FILE = 'text-emphasis-ruby-{:03}-ref.html'
 REF_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Reference: text-emphasis and ruby, {wm}, {pos}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rtc {{ font-variant-east-asian: inherit; }} </style>
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: {wm}; ruby-position: {posval}">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: {wm}; ruby-position: {posval}">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
 '''
 
 TEST_CASES = [
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-010-tests.sh b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-010-tests.sh
index 3e5667429d1..0cf60db1b0d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-010-tests.sh
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-010-tests.sh
@@ -53,6 +53,8 @@ write_test_file() {
     cat <<EOF > $filename
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, $1</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-tests.py b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-tests.py
index eb14e83bc57..34e047ab003 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-tests.py
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/support/generate-text-emphasis-style-property-tests.py
@@ -13,6 +13,8 @@ from __future__ import unicode_literals
 TEST_FILE = 'text-emphasis-style-property-{:03}{}.html'
 TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: {title}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -20,18 +22,20 @@ TEST_TEMPLATE = '''<!DOCTYPE html>
 <meta name="assert" content="'text-emphasis-style: {value}' produces {code} as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-{index:03}-ref.html">
 <p>Pass if there is a '{char}' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: {value}">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: {value}">試験テスト</div>
 '''
 
 REF_FILE = 'text-emphasis-style-property-{:03}-ref.html'
 REF_TEMPLATE = '''<!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: {0}</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt {{ font-variant-east-asian: inherit; }} </style>
 <p>Pass if there is a '{1}' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>{1}</rt>験<rt>{1}</rt>テ<rt>{1}</rt>ス<rt>{1}</rt>ト<rt>{1}</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>{1}</rt>験<rt>{1}</rt>テ<rt>{1}</rt>ス<rt>{1}</rt>ト<rt>{1}</rt></ruby></div>
 '''
 
 DATA_SET = [
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001-ref.html
index 00c87eeb062..43257f99e9c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; color: green"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; color: green"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001.html
index 2d4676ad709..347d2df95c4 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="The color of emphasis marks should be the same as the text by default">
 <link rel="match" href="text-emphasis-color-property-001-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled circle; color: green">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled circle; color: green">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001a.html
index 34c817e6815..f4984d9a286 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001a.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="The color of emphasis marks should be the same as the text for initial value">
 <link rel="match" href="text-emphasis-color-property-001-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled circle; text-emphasis-color: initial; color: green">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled circle; text-emphasis-color: initial; color: green">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001b.html
index 0acb0f76829..a2bf1ca7ec2 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-001b.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="The color of emphasis marks should be the same as the text by default">
 <link rel="match" href="text-emphasis-color-property-001-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: filled circle; color: green">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: filled circle; color: green">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002-ref.html
index 2bcc1d6b9be..345d2873954 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; color: green; } </style>
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002.html
index a215267eb5b..9d6419b3bbd 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-color-property-002.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="Emphasis marks should be rendered with color specified by text-emphasis-color.">
 <link rel="match" href="text-emphasis-color-property-002-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled circle; text-emphasis-color: green">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled circle; text-emphasis-color: green">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001-ref.html
index 682acb71542..6f02e05bdd9 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Reference: text-emphasis line height, top</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are below the black line:</p>
-<div style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001a.html
index 933d4a427bf..ea9589516dc 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, top, horizontal-tb, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-001-ref.html">
 <p>Pass if the emphasis marks are below the black line:</p>
-<div style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001b.html
index 58bf9821d54..d6468cb6c9c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, top, horizontal-tb, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-001-ref.html">
 <p>Pass if the emphasis marks are below the black line:</p>
-<div style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-top: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001z.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001z.html
index 81754d8789b..dded6094e35 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001z.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-001z.html
@@ -17,4 +17,4 @@ textarea {
 }
 </style>
 <p>Pass if the emphasis marks are below the black line:</p>
-<textarea style="line-height: 1; border-top: 1px solid black; text-emphasis: circle;">試験テスト</textarea>
+<textarea lang="ja" style="line-height: 1; border-top: 1px solid black; text-emphasis: circle;">試験テスト</textarea>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002-ref.html
index 345b1c14614..abff3e9e553 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Reference: text-emphasis line height, bottom</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are over the black line:</p>
-<div style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002a.html
index eebe40d1f65..f4a47467a15 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, bottom, horizontal-tb, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-002-ref.html">
 <p>Pass if the emphasis marks are over the black line:</p>
-<div style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002b.html
index 9f65d5f07ad..28a14cf4792 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-002b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, bottom, horizontal-tb, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-002-ref.html">
 <p>Pass if the emphasis marks are over the black line:</p>
-<div style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-bottom: 1px solid black; writing-mode: horizontal-tb; text-emphasis-position: under right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003-ref.html
index a177e9b98c7..d427c76c969 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Reference: text-emphasis line height, right</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the left of the black line:</p>
-<div style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003a.html
index 4e60e5ad007..2b0684a78d1 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, right, vertical-rl, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-003-ref.html">
 <p>Pass if the emphasis marks are to the left of the black line:</p>
-<div style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003b.html
index 01450b1e6e1..a8a6e1f6c1d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, right, vertical-rl, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-003-ref.html">
 <p>Pass if the emphasis marks are to the left of the black line:</p>
-<div style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003c.html
index fde86c7fdb6..35589cb8d7b 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, right, vertical-lr, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-003-ref.html">
 <p>Pass if the emphasis marks are to the left of the black line:</p>
-<div style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over right;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003d.html
index 78a3b1ea024..b02990774e2 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-003d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, right, vertical-lr, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-003-ref.html">
 <p>Pass if the emphasis marks are to the left of the black line:</p>
-<div style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-right: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over right;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004-ref.html
index e2a6a8c83b8..b88ca7c3a35 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Reference: text-emphasis line height, left</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the right of the black line:</p>
-<div style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004a.html
index 0111f238ccd..e8922e97d2a 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, left, vertical-rl, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-004-ref.html">
 <p>Pass if the emphasis marks are to the right of the black line:</p>
-<div style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over left;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over left;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004b.html
index fbe45c04af2..f6ad46dec42 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, left, vertical-rl, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-004-ref.html">
 <p>Pass if the emphasis marks are to the right of the black line:</p>
-<div style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over left;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-rl; text-emphasis-position: over left;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004c.html
index fa678677122..d572de3f18b 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, left, vertical-lr, div</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-004-ref.html">
 <p>Pass if the emphasis marks are to the right of the black line:</p>
-<div style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over left;text-emphasis: circle;">試験テスト</div>
+<div lang="ja" style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over left;text-emphasis: circle;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004d.html
index 2f5e0d4043d..3010b9510eb 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-line-height-004d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-line-height-tests.py -->
 <title>CSS Test: text-emphasis line height, left, vertical-lr, span</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="text emphasis marks should expand the line height like ruby if necessary">
 <link rel="match" href="text-emphasis-line-height-004-ref.html">
 <p>Pass if the emphasis marks are to the right of the black line:</p>
-<div style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over left;"><span style="text-emphasis: circle;">試験テスト</span></div>
+<div lang="ja" style="line-height: 1; border-left: 1px solid black; writing-mode: vertical-lr; text-emphasis-position: over left;"><span style="text-emphasis: circle;">試験テスト</span></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001-ref.html
index a401c67beb1..1121e1602f4 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are over the text below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001.html
index feef0532c73..c6d6c94b446 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over right, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over right' with 'writing-mode: horizontal-tb' puts emphasis marks over the text.">
 <link rel="match" href="text-emphasis-position-property-001-ref.html">
 <p>Pass if the emphasis marks are over the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001a.html
index 731a04e119a..8f7f4025d76 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right over, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right over' with 'writing-mode: horizontal-tb' puts emphasis marks over the text.">
 <link rel="match" href="text-emphasis-position-property-001-ref.html">
 <p>Pass if the emphasis marks are over the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001b.html
index 36b8e455ee9..de111ddd167 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over left, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over left' with 'writing-mode: horizontal-tb' puts emphasis marks over the text.">
 <link rel="match" href="text-emphasis-position-property-001-ref.html">
 <p>Pass if the emphasis marks are over the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001c.html
index 81cf7fd7cbd..2b15c1602c4 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-001c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left over, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left over' with 'writing-mode: horizontal-tb' puts emphasis marks over the text.">
 <link rel="match" href="text-emphasis-position-property-001-ref.html">
 <p>Pass if the emphasis marks are over the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002-ref.html
index 46659494783..a0371c1f031 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are under the text below:</p>
-<div style="line-height: 5; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002.html
index 034a41ac80b..3b4bba33c87 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under right, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under right' with 'writing-mode: horizontal-tb' puts emphasis marks under the text.">
 <link rel="match" href="text-emphasis-position-property-002-ref.html">
 <p>Pass if the emphasis marks are under the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002a.html
index 4aae003b7a2..70583065647 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right under, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right under' with 'writing-mode: horizontal-tb' puts emphasis marks under the text.">
 <link rel="match" href="text-emphasis-position-property-002-ref.html">
 <p>Pass if the emphasis marks are under the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002b.html
index 3ae17dcabf5..d444e50fc02 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under left, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under left' with 'writing-mode: horizontal-tb' puts emphasis marks under the text.">
 <link rel="match" href="text-emphasis-position-property-002-ref.html">
 <p>Pass if the emphasis marks are under the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002c.html
index e67fce56653..ef23120d897 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-002c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left under, horizontal-tb</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left under' with 'writing-mode: horizontal-tb' puts emphasis marks under the text.">
 <link rel="match" href="text-emphasis-position-property-002-ref.html">
 <p>Pass if the emphasis marks are under the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: horizontal-tb; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003-ref.html
index 770fa1e8f5b..9b0ad4d1e98 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003.html
index b8fcd3d8dc7..ea43b14eb72 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right over, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right over' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003a.html
index ded96690c20..5ab81b99eba 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over right, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over right' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003b.html
index 25e69eb1dae..7737205212e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right under, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right under' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003c.html
index 0cf05a3d4da..0420d8fe0bc 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under right, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under right' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003d.html
index 64872191927..a87b6e83a22 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right over, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right over' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: right over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003e.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003e.html
index b2dc58b2dc2..69c2ba26a65 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003e.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003e.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over right, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over right' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: over right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003f.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003f.html
index ad2613bda9a..85124d7810b 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003f.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003f.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right under, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right under' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: right under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003g.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003g.html
index c2cc3d6a886..8de092468aa 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003g.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-003g.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under right, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under right' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-003-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: under right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004-ref.html
index 1e56f5877a9..b82a758f830 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004.html
index 10a42ce812b..dcde40b1e01 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left over, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left over' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004a.html
index e1fc0a7275f..cdee90a84b7 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over left, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over left' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004b.html
index 2deb2e66afa..fe6685e2aa6 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left under, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left under' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004c.html
index 45b14882d7b..6771741ca7e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under left, vertical-rl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under left' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004d.html
index 2c0dd023415..60b32603036 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left over, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left over' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: left over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004e.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004e.html
index 4b17e87c928..f1c22571f72 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004e.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004e.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over left, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over left' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: over left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004f.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004f.html
index 1e7b48b56fc..0d808df8317 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004f.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004f.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left under, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left under' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: left under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004g.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004g.html
index 02860e4fbd1..607455d497c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004g.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-004g.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under left, vertical-lr</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under left' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-004-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: mixed; text-emphasis-position: under left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005-ref.html
index 7427dec9d0a..c6a6df1e03e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; text-orientation: sideways; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; text-orientation: sideways; ruby-position: over"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005.html
index 2eaca9cf002..c6578def6cd 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right over, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right over' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: right over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: right over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005a.html
index 1061e936fff..b67216ff796 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over right, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over right' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: over right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: over right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005b.html
index f535eb2bc3e..87f3c674609 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right under, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right under' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: right under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: right under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005c.html
index 1118047118f..9572d0ef2f7 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under right, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under right' with 'writing-mode: vertical-rl' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: under right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: under right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005d.html
index 390446cdf95..730ffafe41c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right over, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right over' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: right over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: right over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005e.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005e.html
index 6f65274d0c9..a359c24be5f 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005e.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005e.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over right, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over right' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: over right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: over right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005f.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005f.html
index ecec98122cd..d9cb51a48e1 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005f.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005f.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: right under, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: right under' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: right under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: right under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005g.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005g.html
index 81b220bffb9..f6698110d50 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005g.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-005g.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under right, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under right' with 'writing-mode: vertical-lr' puts emphasis marks to the right of the text.">
 <link rel="match" href="text-emphasis-position-property-005-ref.html">
 <p>Pass if the emphasis marks are to the right of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: under right">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: under right">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006-ref.html
index 85af6c250e2..b19d776410c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; text-orientation: sideways; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; text-orientation: sideways; ruby-position: under"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006.html
index 8933513b74d..d0f018b73fc 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left over, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left over' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: left over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: left over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006a.html
index 5aa8067f5f6..c1907197551 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over left, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over left' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: over left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: over left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006b.html
index 6d98ea15f25..769f8be30e1 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left under, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left under' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: left under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: left under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006c.html
index 1d1acd964d0..be9a4f0d29e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under left, vertical-rl, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under left' with 'writing-mode: vertical-rl' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: under left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-rl; text-orientation: sideways; text-emphasis-position: under left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006d.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006d.html
index 575f07d5f73..c60768aa358 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006d.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006d.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left over, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left over' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: left over">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: left over">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006e.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006e.html
index d03a66cc285..cdc57bad01e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006e.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006e.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: over left, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: over left' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: over left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: over left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006f.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006f.html
index 955a5e21212..103926cb3bb 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006f.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006f.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: left under, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: left under' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: left under">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: left under">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006g.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006g.html
index 9f21cc5c9c6..1660104a256 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006g.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-position-property-006g.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-position-property-tests.py -->
 <title>CSS Test: text-emphasis-position: under left, vertical-lr, sideways</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-position: under left' with 'writing-mode: vertical-lr' puts emphasis marks to the left of the text.">
 <link rel="match" href="text-emphasis-position-property-006-ref.html">
 <p>Pass if the emphasis marks are to the left of the text below:</p>
-<div style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: under left">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle; writing-mode: vertical-lr; text-orientation: sideways; text-emphasis-position: under left">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-001.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-001.html
index f45e2add883..e208adc8242 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-001.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-001.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="text-emphasis: none does not produce any emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-001-ref.html">
 <p>Pass if there is NO emphasis marks above the text below:</p>
-<div style="line-height: 5; text-emphasis: none">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: none">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-002.html
index 0083d3e7a00..0048f4fd141 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-002.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis: string' uses the given string as emphasis marks">
 <link rel="match" href="text-emphasis-style-property-002-ref.html">
 <p>Pass if there is a '^' above every character below:</p>
-<div style="line-height: 5; text-emphasis: '^'">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: '^'">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003.html
index fc35010e3ab..cc564df57ce 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis: circle' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003a.html
index e70518b0624..313cf0ee176 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003a.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis: filled' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003b.html
index 79e66bc93a2..c90d455126d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-003b.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis: filled circle' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: filled circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: filled circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004.html
index 15d2ab001cc..6af2210d22d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="Emphasis marks should be rendered with color specified by text-emphasis.">
 <link rel="match" href="text-emphasis-color-property-002-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: circle green">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: circle green">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004a.html
index 6d0d80d2941..23039ae6ced 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-property-004a.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="Emphasis marks should be rendered with color specified by text-emphasis.">
 <link rel="match" href="text-emphasis-color-property-002-ref.html">
 <p>Pass if there is a <strong>green</strong> '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis: green circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis: green circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001-ref.html
index e48967f9f9c..6b1d6bd2f0e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Reference: text-emphasis and ruby, horizontal-tb, top</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rtc { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: horizontal-tb; ruby-position: over">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: horizontal-tb; ruby-position: over">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001.html
index 61c47aa0bf1..03f562bc8db 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-001.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, horizontal-tb, top</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-001-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: horizontal-tb; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: horizontal-tb; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002-ref.html
index ca2c0cc6f66..a3ecaf6c69e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Reference: text-emphasis and ruby, horizontal-tb, bottom</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rtc { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: horizontal-tb; ruby-position: under">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: horizontal-tb; ruby-position: under">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002.html
index 47fcfe19f91..c43a2a6d112 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-002.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, horizontal-tb, bottom</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-002-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: horizontal-tb; ruby-position: under; text-emphasis-position: under right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: horizontal-tb; ruby-position: under; text-emphasis-position: under right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003-ref.html
index 182037b0d52..31cb1e6a0d0 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Reference: text-emphasis and ruby, vertical-rl, right</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rtc { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: over">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: over">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003.html
index f3cff064f15..2ac104077d1 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, vertical-rl, right</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-003-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003a.html
index 8dbb5a0a4a8..6d49877fddf 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-003a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, vertical-lr, right</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-003-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-lr; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-lr; ruby-position: over; text-emphasis-position: over right">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004-ref.html
index 44bcba492c7..22b628d9641 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Reference: text-emphasis and ruby, vertical-rl, left</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rtc { font-variant-east-asian: inherit; } </style>
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: under">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: under">ルビ<ruby>と<rtc>&#x25CF;</rtc>圏<rt>けん</rt><rtc>&#x25CF;</rtc>点<rt>てん</rt><rtc>&#x25CF;</rtc>を<rtc>&#x25CF;</rtc></ruby>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004.html
index f95fd809a77..d32dcb55cef 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, vertical-rl, left</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-004-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-rl; ruby-position: under; text-emphasis-position: over left">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-rl; ruby-position: under; text-emphasis-position: over left">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004a.html
index cf0ba4c4a1b..75146654054 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-ruby-004a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-ruby-tests.py -->
 <title>CSS Test: text-emphasis and ruby, vertical-lr, left</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="emphasis marks are drawn outside the ruby">
 <link rel="match" href="text-emphasis-ruby-004-ref.html">
 <p>Pass if the emphasis marks are outside the ruby:</p>
-<div style="line-height: 5; writing-mode: vertical-lr; ruby-position: under; text-emphasis-position: over left">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
+<div lang="ja" style="line-height: 5; writing-mode: vertical-lr; ruby-position: under; text-emphasis-position: over left">ルビ<span style="text-emphasis: circle">と<ruby>圏<rt>けん</rt>点<rt>てん</rt></ruby>を</span>同時</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001-ref.html
index 60f8fa7b95c..9dc6c897cf4 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001-ref.html
@@ -4,4 +4,4 @@
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <p>Pass if there is NO emphasis marks above the text below:</p>
-<div style="line-height: 5;">試験テスト</div>
+<div lang="ja" style="line-height: 5;">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001.html
index 910293b44a3..e2bc386afd6 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-001.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="text-emphasis-style: none does not produce any emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-001-ref.html">
 <p>Pass if there is NO emphasis marks above the text below:</p>
-<div style="line-height: 5; text-emphasis-style: none">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: none">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002-ref.html
index e9cf74415ce..10504677c72 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: normal; } </style>
 <p>Pass if there is a '^' above every character below:</p>
-<div style="line-height: 5"><ruby>試<rt>^</rt>験<rt>^</rt>テ<rt>^</rt>ス<rt>^</rt>ト<rt>^</rt></ruby></div>
+<div lang="ja" style="line-height: 5"><ruby>試<rt>^</rt>験<rt>^</rt>テ<rt>^</rt>ス<rt>^</rt>ト<rt>^</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002.html
index dc0496653d1..20162842a84 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-002.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis-style: string' uses the given string as emphasis marks">
 <link rel="match" href="text-emphasis-style-property-002-ref.html">
 <p>Pass if there is a '^' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: '^'">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: '^'">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003-ref.html
index d0c558d1979..fadc7d2773e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: normal; } </style>
 <p>Pass if there is a '&#xFE45;' to the right of every character below:</p>
-<div style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>&#xFE45;</rt>験<rt>&#xFE45;</rt>テ<rt>&#xFE45;</rt>ス<rt>&#xFE45;</rt>ト<rt>&#xFE45;</rt></ruby></div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>&#xFE45;</rt>験<rt>&#xFE45;</rt>テ<rt>&#xFE45;</rt>ス<rt>&#xFE45;</rt>ト<rt>&#xFE45;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003.html
index b2af7448f1d..4bfcffffa2e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-003.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis-style: filled' produces U+FE45 as emphasis marks in vertical writing modes.">
 <link rel="match" href="text-emphasis-style-property-003-ref.html">
 <p>Pass if there is a '&#xFE45;' to the right of every character below:</p>
-<div style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: filled">試験テスト</div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004-ref.html
index 493f0c67364..d89ae5a5c87 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: normal; } </style>
 <p>Pass if there is a '&#xFE46;' to the right of every character below:</p>
-<div style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>&#xFE46;</rt>験<rt>&#xFE46;</rt>テ<rt>&#xFE46;</rt>ス<rt>&#xFE46;</rt>ト<rt>&#xFE46;</rt></ruby></div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>&#xFE46;</rt>験<rt>&#xFE46;</rt>テ<rt>&#xFE46;</rt>ス<rt>&#xFE46;</rt>ト<rt>&#xFE46;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004.html
index 06fc2fd7c36..360b0357c24 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-004.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="'text-emphasis: open sesame' produces U+FE46 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-004-ref.html">
 <p>Pass if there is a '&#xFE46;' to the right of every character below:</p>
-<div style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: open">試験テスト</div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005-ref.html
index b6549026703..361591860ad 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005-ref.html
@@ -5,4 +5,4 @@
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: normal; text-orientation: upright; } </style>
 <p>Pass if the emphasis marks 'V' are upright:</p>
-<div style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>V</rt>験<rt>V</rt>テ<rt>V</rt>ス<rt>V</rt>ト<rt>V</rt></ruby></div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5;"><ruby>試<rt>V</rt>験<rt>V</rt>テ<rt>V</rt>ス<rt>V</rt>ト<rt>V</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005.html
index 29be3abda07..fc8ae4e4613 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="Emphasis marks must remain upright in vertical writing modes">
 <link rel="match" href="text-emphasis-style-property-005-ref.html">
 <p>Pass if the emphasis marks 'V' are upright:</p>
-<div style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: 'V'">試験テスト</div>
+<div lang="ja" style="writing-mode: vertical-rl; line-height: 5; text-emphasis-style: 'V'">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005a.html
index af0ad4e0aa7..3ea24ba611a 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-005a.html
@@ -7,4 +7,4 @@
 <meta name="assert" content="Emphasis marks must remain upright in vertical writing modes">
 <link rel="match" href="text-emphasis-style-property-005-ref.html">
 <p>Pass if the emphasis marks 'V' are upright:</p>
-<div style="writing-mode: vertical-lr; line-height: 5; text-emphasis-style: 'V'">試験テスト</div>
+<div lang="ja" style="writing-mode: vertical-lr; line-height: 5; text-emphasis-style: 'V'">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cc.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cc.html
index 78ded1ca286..0cb33577314 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cc.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cc.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, Cc</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cf.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cf.html
index 012ef378527..9bc696adeb6 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cf.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Cf.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, Cf</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zl.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zl.html
index 38840ba3839..6884553d268 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zl.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zl.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, Zl</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zp.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zp.html
index f0bbdbc8ad1..e46f3f80ef7 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zp.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zp.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, Zp</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zs.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zs.html
index c6e4152522b..f00874cecd2 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zs.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-010Zs.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-010-tests.sh -->
 <title>CSS Test: text-emphasis, Zs</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011-ref.html
index 9f28f3f411d..4d601378ede 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: filled dot</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x2022;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x2022;</rt>験<rt>&#x2022;</rt>テ<rt>&#x2022;</rt>ス<rt>&#x2022;</rt>ト<rt>&#x2022;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x2022;</rt>験<rt>&#x2022;</rt>テ<rt>&#x2022;</rt>ス<rt>&#x2022;</rt>ト<rt>&#x2022;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011.html
index ed8d0fd4e0a..91be2c00168 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled dot</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled dot' produces U+2022 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-011-ref.html">
 <p>Pass if there is a '&#x2022;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled dot">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled dot">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011a.html
index 8492801983f..1d7b6e31c0f 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: dot filled</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: dot filled' produces U+2022 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-011-ref.html">
 <p>Pass if there is a '&#x2022;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: dot filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: dot filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011b.html
index 894b57e243a..bec775b7734 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-011b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: dot</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: dot' produces U+2022 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-011-ref.html">
 <p>Pass if there is a '&#x2022;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: dot">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: dot">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012-ref.html
index 672a659f4e9..ba6d4c2e56c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: filled circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25CF;</rt>験<rt>&#x25CF;</rt>テ<rt>&#x25CF;</rt>ス<rt>&#x25CF;</rt>ト<rt>&#x25CF;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012.html
index 97c8dfde079..5e1362f7595 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled circle' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012a.html
index 5aa13441c3c..83e8d79c8f2 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: circle filled</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: circle filled' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: circle filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: circle filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012b.html
index a9ece184d2f..df71056457b 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: circle' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012c.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012c.html
index 62447324734..552b62bf7f3 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012c.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-012c.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled, horizontal</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled' produces U+25CF as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-012-ref.html">
 <p>Pass if there is a '&#x25CF;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013-ref.html
index 5d6cb187df6..c22aecee515 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: filled double-circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25C9;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25C9;</rt>験<rt>&#x25C9;</rt>テ<rt>&#x25C9;</rt>ス<rt>&#x25C9;</rt>ト<rt>&#x25C9;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25C9;</rt>験<rt>&#x25C9;</rt>テ<rt>&#x25C9;</rt>ス<rt>&#x25C9;</rt>ト<rt>&#x25C9;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013.html
index 074ef47f1dc..39d2c6325f8 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled double-circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled double-circle' produces U+25C9 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-013-ref.html">
 <p>Pass if there is a '&#x25C9;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled double-circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled double-circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013a.html
index b641c21e585..0ac4b835370 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: double-circle filled</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: double-circle filled' produces U+25C9 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-013-ref.html">
 <p>Pass if there is a '&#x25C9;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: double-circle filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: double-circle filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013b.html
index 2f68d44841a..25768be05d6 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-013b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: double-circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: double-circle' produces U+25C9 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-013-ref.html">
 <p>Pass if there is a '&#x25C9;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: double-circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: double-circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014-ref.html
index a18fc957be5..c816fd524ca 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: filled triangle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25B2;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25B2;</rt>験<rt>&#x25B2;</rt>テ<rt>&#x25B2;</rt>ス<rt>&#x25B2;</rt>ト<rt>&#x25B2;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25B2;</rt>験<rt>&#x25B2;</rt>テ<rt>&#x25B2;</rt>ス<rt>&#x25B2;</rt>ト<rt>&#x25B2;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014.html
index 60231abf935..2e3c69dd09c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled triangle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled triangle' produces U+25B2 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-014-ref.html">
 <p>Pass if there is a '&#x25B2;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled triangle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled triangle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014a.html
index 1c72bda8092..9fa3f14a40e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: triangle filled</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: triangle filled' produces U+25B2 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-014-ref.html">
 <p>Pass if there is a '&#x25B2;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: triangle filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: triangle filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014b.html
index 9b32cdd67f8..fd5db557166 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-014b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: triangle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: triangle' produces U+25B2 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-014-ref.html">
 <p>Pass if there is a '&#x25B2;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: triangle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: triangle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015-ref.html
index a9cef72d31f..0b0cc8da374 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: filled sesame</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#xFE45;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#xFE45;</rt>験<rt>&#xFE45;</rt>テ<rt>&#xFE45;</rt>ス<rt>&#xFE45;</rt>ト<rt>&#xFE45;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#xFE45;</rt>験<rt>&#xFE45;</rt>テ<rt>&#xFE45;</rt>ス<rt>&#xFE45;</rt>ト<rt>&#xFE45;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015.html
index 6c62462adae..9b11e53e8d8 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: filled sesame</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: filled sesame' produces U+FE45 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-015-ref.html">
 <p>Pass if there is a '&#xFE45;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: filled sesame">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: filled sesame">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015a.html
index e059497b048..e8b3c73bba3 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: sesame filled</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: sesame filled' produces U+FE45 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-015-ref.html">
 <p>Pass if there is a '&#xFE45;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: sesame filled">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: sesame filled">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015b.html
index a243600b064..dcc30c0cf9a 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-015b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: sesame</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: sesame' produces U+FE45 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-015-ref.html">
 <p>Pass if there is a '&#xFE45;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: sesame">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: sesame">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016-ref.html
index 6b104021b1c..47a6377ca2b 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: open dot</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25E6;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25E6;</rt>験<rt>&#x25E6;</rt>テ<rt>&#x25E6;</rt>ス<rt>&#x25E6;</rt>ト<rt>&#x25E6;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25E6;</rt>験<rt>&#x25E6;</rt>テ<rt>&#x25E6;</rt>ス<rt>&#x25E6;</rt>ト<rt>&#x25E6;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016.html
index 954f9f4e849..e8303756753 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open dot</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open dot' produces U+25E6 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-016-ref.html">
 <p>Pass if there is a '&#x25E6;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open dot">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open dot">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016a.html
index aeabcfa7021..eb7be9a602c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-016a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: dot open</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: dot open' produces U+25E6 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-016-ref.html">
 <p>Pass if there is a '&#x25E6;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: dot open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: dot open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017-ref.html
index c0be7ffd8ca..b033567cc62 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: open circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25CB;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25CB;</rt>験<rt>&#x25CB;</rt>テ<rt>&#x25CB;</rt>ス<rt>&#x25CB;</rt>ト<rt>&#x25CB;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25CB;</rt>験<rt>&#x25CB;</rt>テ<rt>&#x25CB;</rt>ス<rt>&#x25CB;</rt>ト<rt>&#x25CB;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017.html
index 948ccf083f5..1d778a8af5e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open circle' produces U+25CB as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-017-ref.html">
 <p>Pass if there is a '&#x25CB;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017a.html
index b9f58a8885f..8e1b0b2859f 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: circle open</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: circle open' produces U+25CB as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-017-ref.html">
 <p>Pass if there is a '&#x25CB;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: circle open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: circle open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017b.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017b.html
index 19ae3c8cb45..e6b75fdc883 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017b.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-017b.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open, horizontal</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open' produces U+25CB as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-017-ref.html">
 <p>Pass if there is a '&#x25CB;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018-ref.html
index f9d2980a80c..e1a60397017 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: open double-circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25CE;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25CE;</rt>験<rt>&#x25CE;</rt>テ<rt>&#x25CE;</rt>ス<rt>&#x25CE;</rt>ト<rt>&#x25CE;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25CE;</rt>験<rt>&#x25CE;</rt>テ<rt>&#x25CE;</rt>ス<rt>&#x25CE;</rt>ト<rt>&#x25CE;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018.html
index 30713e614b2..6fe162d67a9 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open double-circle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open double-circle' produces U+25CE as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-018-ref.html">
 <p>Pass if there is a '&#x25CE;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open double-circle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open double-circle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018a.html
index b3e577df10a..44c0cb7bb6f 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-018a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: double-circle open</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: double-circle open' produces U+25CE as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-018-ref.html">
 <p>Pass if there is a '&#x25CE;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: double-circle open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: double-circle open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019-ref.html
index b8f4f201f00..ec50cc8b4cc 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: open triangle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#x25B3;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#x25B3;</rt>験<rt>&#x25B3;</rt>テ<rt>&#x25B3;</rt>ス<rt>&#x25B3;</rt>ト<rt>&#x25B3;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#x25B3;</rt>験<rt>&#x25B3;</rt>テ<rt>&#x25B3;</rt>ス<rt>&#x25B3;</rt>ト<rt>&#x25B3;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019.html
index 20c8069ecc1..8014ceccb2d 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open triangle</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open triangle' produces U+25B3 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-019-ref.html">
 <p>Pass if there is a '&#x25B3;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open triangle">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open triangle">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019a.html
index f73bf211146..7e79b41d822 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-019a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: triangle open</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: triangle open' produces U+25B3 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-019-ref.html">
 <p>Pass if there is a '&#x25B3;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: triangle open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: triangle open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020-ref.html
index 1502d3d7f5a..81a2aedd353 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020-ref.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Reference: text-emphasis-style: open sesame</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
 <style> rt { font-variant-east-asian: inherit; } </style>
 <p>Pass if there is a '&#xFE46;' above every character below:</p>
-<div style="line-height: 5;"><ruby>試<rt>&#xFE46;</rt>験<rt>&#xFE46;</rt>テ<rt>&#xFE46;</rt>ス<rt>&#xFE46;</rt>ト<rt>&#xFE46;</rt></ruby></div>
+<div lang="ja" style="line-height: 5;"><ruby>試<rt>&#xFE46;</rt>験<rt>&#xFE46;</rt>テ<rt>&#xFE46;</rt>ス<rt>&#xFE46;</rt>ト<rt>&#xFE46;</rt></ruby></div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020.html
index 09c5ae5348f..e77c3173d2c 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: open sesame</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: open sesame' produces U+FE46 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-020-ref.html">
 <p>Pass if there is a '&#xFE46;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: open sesame">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: open sesame">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020a.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020a.html
index a32781d618e..19a9059e2fa 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020a.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/text-decor-3/text-emphasis-style-property-020a.html
@@ -1,5 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
+<!-- This file was generated automatically by the script
+     ./support/generate-text-emphasis-style-property-tests.py -->
 <title>CSS Test: text-emphasis-style: sesame open</title>
 <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
 <link rel="author" title="Mozilla" href="https://www.mozilla.org">
@@ -7,4 +9,4 @@
 <meta name="assert" content="'text-emphasis-style: sesame open' produces U+FE46 as emphasis marks.">
 <link rel="match" href="text-emphasis-style-property-020-ref.html">
 <p>Pass if there is a '&#xFE46;' above every character below:</p>
-<div style="line-height: 5; text-emphasis-style: sesame open">試験テスト</div>
+<div lang="ja" style="line-height: 5; text-emphasis-style: sesame open">試験テスト</div>
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/submission-process.md b/tests/wpt/web-platform-tests/docs/writing-tests/submission-process.md
index 4ff99b8c16a..c6268f9b11d 100644
--- a/tests/wpt/web-platform-tests/docs/writing-tests/submission-process.md
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/submission-process.md
@@ -37,24 +37,25 @@ GitHub will inform interested parties.
 
 ## Previews
 
-The website [wpt-submissions.live](http://wpt-submissions.live) exists to help
-contributors demonstrate their proposed changes to others. If your pull request
-is open and has the GitHub label `pull-request-has-preview`, then it will be
-available at `http://wpt-submissions.live/{{pull request ID}}`, where "pull
-request ID" is the numeric identifier for the pull request.
+The website [http://w3c-test.org](http://w3c-test.org) exists to help
+contributors demonstrate their proposed changes to others. If you are [a GitHub
+collaborator](https://help.github.com/en/articles/permission-levels-for-a-user-account-repository)
+on WPT, then the content of your pull requests will be available at
+`http://w3c-test.org/submissions/{{pull request ID}}`, where "pull request ID"
+is the numeric identifier for the pull request.
 
 For example, a pull request at https://github.com/web-platform-tests/wpt/pull/3
-has a pull request ID `3`. Once that has been assigned the
-`pull-request-has-preview` label, then its contents can be viewed at
-http://wpt-submissions.live/3.
+has a pull request ID `3`. Its contents can be viewed at
+http://w3c-test.org/submissions/3.
 
-If you are [a GitHub
-collaborator](https://help.github.com/en/articles/permission-levels-for-a-user-account-repository)
-on WPT, the label and the preview will be created automatically. Because the
-WPT server will execute Python code in the mirrored submissions, previews are
-not created automatically for non-collaborators. Collaborators are encouraged
-to enable the preview by adding the label, provided they trust the authors not
-to submit malicious code.
+If you are *not* a GitHub collaborator, then your submission may be made
+available if a collaborator makes the following comment on your pull request:
+"w3c-test:mirror".
+
+Previews are not created automatically for non-collaborators because the WPT
+server will execute Python code in the mirrored submissions. Collaborators are
+encouraged to enable the preview by making the special comment only if they
+trust the authors not to submit malicious code.
 
 [repo]: https://github.com/web-platform-tests/wpt/
 [github flow]: https://guides.github.com/introduction/flow/
diff --git a/tests/wpt/web-platform-tests/import-maps/resources/jest-test-helper.js b/tests/wpt/web-platform-tests/import-maps/resources/jest-test-helper.js
index 86556ed3dd9..8d9236a84d8 100644
--- a/tests/wpt/web-platform-tests/import-maps/resources/jest-test-helper.js
+++ b/tests/wpt/web-platform-tests/import-maps/resources/jest-test-helper.js
@@ -80,16 +80,28 @@ function parseFromString(mapString, mapBaseURL) {
   iframe.contentDocument.write(`
     <base href="${mapBaseURL}">
     <script>
-    let isError = false;
-    function onError() {
-      isError = true;
+    var scriptError;
+    var windowError;
+    function onScriptError(event) {
+      scriptError = event.error;
     }
+    function onWindowError(event) {
+      windowError = event.error;
+      return false;
+    }
+    window.addEventListener('error', onWindowError);
     </sc` + `ript>
-    <script type="importmap" onerror="onError()">
+    <script type="importmap" onerror="onScriptError(event)">
     ${mapString}
     </sc` + `ript>
   `);
   iframe.contentDocument.close();
+
+  // Rethrow window's error event.
+  if (iframe.contentWindow.windowError) {
+    throw iframe.contentWindow.windowError;
+  }
+
   return iframe;
 }
 
diff --git a/tests/wpt/web-platform-tests/interfaces/InputDeviceCapabilities.idl b/tests/wpt/web-platform-tests/interfaces/InputDeviceCapabilities.idl
index 17f74b6855d..cb5d2827e40 100644
--- a/tests/wpt/web-platform-tests/interfaces/InputDeviceCapabilities.idl
+++ b/tests/wpt/web-platform-tests/interfaces/InputDeviceCapabilities.idl
@@ -3,7 +3,8 @@
 // (https://github.com/tidoust/reffy-reports)
 // Source: Input Device Capabilities (https://wicg.github.io/InputDeviceCapabilities/)
 
-[Constructor(optional InputDeviceCapabilitiesInit deviceInitDict)]
+[Exposed=Window,
+ Constructor(optional InputDeviceCapabilitiesInit deviceInitDict = {})]
 interface InputDeviceCapabilities {
   readonly attribute boolean firesTouchEvents;
   readonly attribute boolean pointerMovementScrolls;
diff --git a/tests/wpt/web-platform-tests/interfaces/SVG.idl b/tests/wpt/web-platform-tests/interfaces/SVG.idl
index 8894f7b3336..97871c2f023 100644
--- a/tests/wpt/web-platform-tests/interfaces/SVG.idl
+++ b/tests/wpt/web-platform-tests/interfaces/SVG.idl
@@ -219,16 +219,6 @@ interface mixin SVGFitToViewBox {
   [SameObject] readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
 };
 
-interface mixin SVGZoomAndPan {
-
-  // Zoom and Pan Types
-  const unsigned short SVG_ZOOMANDPAN_UNKNOWN = 0;
-  const unsigned short SVG_ZOOMANDPAN_DISABLE = 1;
-  const unsigned short SVG_ZOOMANDPAN_MAGNIFY = 2;
-
-  attribute unsigned short zoomAndPan;
-};
-
 interface mixin SVGURIReference {
   [SameObject] readonly attribute SVGAnimatedString href;
 };
@@ -275,7 +265,6 @@ interface SVGSVGElement : SVGGraphicsElement {
 };
 
 SVGSVGElement includes SVGFitToViewBox;
-SVGSVGElement includes SVGZoomAndPan;
 SVGSVGElement includes WindowEventHandlers;
 
 [Exposed=Window]
@@ -688,4 +677,3 @@ SVGAElement includes HTMLHyperlinkElementUtils;
 interface SVGViewElement : SVGElement {};
 
 SVGViewElement includes SVGFitToViewBox;
-SVGViewElement includes SVGZoomAndPan;
diff --git a/tests/wpt/web-platform-tests/interfaces/html.idl b/tests/wpt/web-platform-tests/interfaces/html.idl
index 98c633af212..d856cd578aa 100644
--- a/tests/wpt/web-platform-tests/interfaces/html.idl
+++ b/tests/wpt/web-platform-tests/interfaces/html.idl
@@ -136,6 +136,7 @@ interface mixin HTMLOrSVGElement {
   [SameObject] readonly attribute DOMStringMap dataset;
   attribute DOMString nonce; // intentionally no [CEReactions]
 
+  [CEReactions] attribute boolean autofocus;
   [CEReactions] attribute long tabIndex;
   void focus(optional FocusOptions options = {});
   void blur();
@@ -820,7 +821,6 @@ interface HTMLInputElement : HTMLElement {
   [CEReactions] attribute DOMString accept;
   [CEReactions] attribute DOMString alt;
   [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute boolean autofocus;
   [CEReactions] attribute boolean defaultChecked;
   attribute boolean checked;
   [CEReactions] attribute DOMString dirName;
@@ -881,7 +881,6 @@ interface HTMLInputElement : HTMLElement {
 [Exposed=Window,
  HTMLConstructor]
 interface HTMLButtonElement : HTMLElement {
-  [CEReactions] attribute boolean autofocus;
   [CEReactions] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
   [CEReactions] attribute USVString formAction;
@@ -907,7 +906,6 @@ interface HTMLButtonElement : HTMLElement {
  HTMLConstructor]
 interface HTMLSelectElement : HTMLElement {
   [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute boolean autofocus;
   [CEReactions] attribute boolean disabled;
   readonly attribute HTMLFormElement? form;
   [CEReactions] attribute boolean multiple;
@@ -972,7 +970,6 @@ interface HTMLOptionElement : HTMLElement {
  HTMLConstructor]
 interface HTMLTextAreaElement : HTMLElement {
   [CEReactions] attribute DOMString autocomplete;
-  [CEReactions] attribute boolean autofocus;
   [CEReactions] attribute unsigned long cols;
   [CEReactions] attribute DOMString dirName;
   [CEReactions] attribute boolean disabled;
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_in_capturing.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_in_capturing.html
index 1ed26eb6dcf..3d2ff7079b8 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_in_capturing.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_boundary_events_in_capturing.html
@@ -31,17 +31,22 @@
                 var test_pointerEvent = setup_pointerevent_test("pointerevent boundary events in capturing", ALL_POINTERS);
                 var target = document.getElementById("target0");
                 var listener = document.getElementById("listener");
+                var actions_promise;
 
                 eventList.forEach(function(eventName) {
                     on_event(target, eventName, function (event) {
                         if (phase == PhaseEnum.WaitingForDown) {
                             if (eventName == 'pointerdown') {
-                              listener.setPointerCapture(event.pointerId);
-                              phase = PhaseEnum.WaitingForFirstMove;
+                                listener.setPointerCapture(event.pointerId);
+                                phase = PhaseEnum.WaitingForFirstMove;
                             }
                         } else if (phase == PhaseEnum.WaitingForUp) {
-                            if (event.type == 'pointerup')
-                                test_pointerEvent.done();
+                            if (event.type == 'pointerup') {
+                                // Make sure the test finishes after all the input actions are completed.
+                                actions_promise.then( () => {
+                                    test_pointerEvent.done();
+                                });
+                            }
                         } else {
                             eventsRecieved.push(event.type + '@target');
                             if (phase == PhaseEnum.WaitingForSecondMove && event.type == 'pointermove') {
@@ -49,7 +54,7 @@
                                     checkPointerEventType(event);
                                     assert_array_equals(eventsRecieved, ['lostpointercapture@listener', 'pointerout@listener', 'pointerleave@listener', 'pointerover@target', 'pointerenter@target', 'pointermove@target'],
                                         'lostpointercapture and pointerout/leave should be dispatched to the capturing target and pointerover/enter should be dispatched to the hit-test element before the first pointermove event after releasing pointer capture');
-                                }, expectedPointerType + " pointer events boundary events when releasing capture"); 
+                                }, expectedPointerType + " pointer events boundary events when releasing capture");
                                 phase = PhaseEnum.WaitingForUp;
                             }
                         }
@@ -72,7 +77,7 @@
                 });
 
                 // Inject pointer inputs.
-                pointerDragInTarget('mouse', target0, 'right').then(function() {
+                actions_promise = pointerDragInTarget('mouse', target0, 'right').then(function() {
                     return pointerDragInTarget('touch', target0, 'right');
                 }).then(function() {
                     return pointerDragInTarget('pen', target0, 'right');
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_during_capture.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_during_capture.html
index 7f63283b61a..2acd5dc1287 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_during_capture.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_during_capture.html
@@ -44,6 +44,7 @@
                 var grey = document.getElementById('grey');
                 var blue = document.getElementById('blue');
                 var green = document.getElementById('green');
+                var actions_promise;
 
                 ['gotpointercapture', 'lostpointercapture', 'pointerdown', 'pointerup', 'click'].forEach(function(eventName) {
                   [grey, blue, green].forEach(function(target) {
@@ -75,7 +76,10 @@
                             test_pointerEvent.step(function() {
                               assert_equals(receivedEvents.join(','), 'pointerdown@blue,gotpointercapture@blue,pointerup@blue,click@blue,lostpointercapture@blue', 'An element should only receive click when it is the first common ancestor of pointerdown and pointerup targets');
                             });
-                            test_pointerEvent.done();
+                            // Make sure the test finishes after all the input actions are completed.
+                            actions_promise.then( () => {
+                              test_pointerEvent.done();
+                            });
                           }
                         }
                         if (event.type == 'pointerdown' && (target == blue || target == green)) {
@@ -88,9 +92,7 @@
                 });
 
                 // Inject mouse inputs.
-                var green = document.getElementById('green');
-                var blue = document.getElementById('blue');
-                new test_driver.Actions()
+                var actions_promise = new test_driver.Actions()
                     .pointerMove(0, 0, {origin: green})
                     .pointerDown()
                     .pointerUp()
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_disabled_form_control.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_disabled_form_control.html
index cf44677c759..13f6e31cb41 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_disabled_form_control.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_disabled_form_control.html
@@ -22,6 +22,7 @@
             function run() {
                 var test_pointerEvent = setup_pointerevent_test("pointerevent attributes", ALL_POINTERS);
                 var target = document.getElementById("target0");
+                var actions_promise;
 
                 eventList.forEach(function(eventName) {
                 on_event(target, eventName, function (event) {
@@ -29,7 +30,10 @@
                         detected_pointertypes[event.pointerType] = true;
 
                         if (Object.keys(detected_eventTypes).length == eventList.length) {
-                            test_pointerEvent.done();
+                            // Make sure the test finishes after all the input actions are completed.
+                            actions_promise.then( () => {
+                                test_pointerEvent.done();
+                            });
                         }
                     });
                 });
@@ -38,7 +42,7 @@
                 });
 
                 // Inject touch inputs.
-                clickInTarget("mouse", target).then(function() {
+                actions_promise = clickInTarget("mouse", target).then(function() {
                     return new test_driver.Actions()
                         .addPointer("mousePointer1", "mouse")
                         .pointerMove(0, 0)
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_element_haspointercapture.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_element_haspointercapture.html
index c9690a688c5..3db6acf8e57 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_element_haspointercapture.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_element_haspointercapture.html
@@ -27,6 +27,7 @@
             function run() {
                 var target0 = document.getElementById("target0");
                 var target1 = document.getElementById("target1");
+                var actions_promise;
 
                 on_event(target0, "pointerdown", function (e) {
                     detected_pointertypes[e.pointerType] = true;
@@ -103,11 +104,14 @@
                         assert_equals(target1.hasPointerCapture(e.pointerId), false,
                                       "pointerup target1.hasPointerCapture should be false");
                     });
-                    test_pointerEvent.done();
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
+                        test_pointerEvent.done();
+                    });
                 });
 
                 // Inject mouse inputs.
-                new test_driver.Actions()
+                actions_promise = new test_driver.Actions()
                     .pointerMove(0, 0, {origin: target0})
                     .pointerDown()
                     .pointerMove(0, 10, {origin: target0})
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
index 7d38de74469..a8153c256fc 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerenter_does_not_bubble.html
@@ -27,6 +27,7 @@
             function run() {
                 var target0 = document.getElementById("target0");
                 var parent0 = document.getElementById("parent0");
+                var actions_promise;
 
                 on_event(target0, "pointerenter", function (event) {
                     pointerenter_event = event;
@@ -41,7 +42,10 @@
                     test_pointerEvent.step(function () {
                         assert_not_equals(pointerenter_event, null, "pointerout event was never received: ");
                     });
-                    test_pointerEvent.done(); // complete test
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
+                        test_pointerEvent.done();
+                    });
                 });
 
                 // parent
@@ -53,7 +57,7 @@
                 });
 
                 // Inject mouse inputs.
-                new test_driver.Actions()
+                actions_promise = new test_driver.Actions()
                     .pointerMove(0, 0, {origin: target0})
                     .pointerMove(-10, -10, {origin: target0})
                     .pointerMove(-20, -20, {origin: target0})
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
index fe121a8409d..6133b05c649 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerleave_descendants.html
@@ -22,7 +22,6 @@
             <div style="background:purple; height: 35px; width: 90%; position: absolute"></div>
         </div>
         <script>
-            var eventTested = false;
             var detected_pointertypes = {};
 
             add_completion_callback(showPointerTypes);
@@ -31,6 +30,7 @@
                 var target0 = document.getElementById("target0");
                 var target1 = document.querySelector("#target0 > div");
                 var test_pointerleave = async_test("pointerleave event received");
+                var actions_promise;
 
                 on_event(target0, "pointerover", function(event) {
                     detected_pointertypes[ event.pointerType ] = true;
@@ -39,14 +39,14 @@
                 // When a pointing device is moved off of the hit test boundaries of an element and all of its descendants, the pointerleave event must be dispatched.
                 // TA: 9.1
                 on_event(target0, "pointerleave", function (event) {
-                    if (eventTested == false) {
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
                         test_pointerleave.done();
-                        eventTested = true;
-                    }
+                    });
                 });
 
                 // Inject mouse inputs.
-                new test_driver.Actions()
+                actions_promise = new test_driver.Actions()
                     .pointerMove(0, 0, {origin: target0})
                     .pointerMove(0, 0, {origin: target1})
                     .pointerMove(0, 0)
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove.html
index 4b168439a4e..c7e798b087e 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove.html
@@ -18,26 +18,26 @@
         <h4>Test Description: This test checks if pointermove event triggers. Move your mouse over the black rectangle or slide it if you are using touchscreen.</h4>
         <div id="target0" style="background:black"></div>
         <script>
-            var eventTested = false;
             var detected_pointertypes = {};
             var test_pointermove = async_test("pointermove event received");
             add_completion_callback(showPointerTypes);
 
             function run() {
                 var target0 = document.getElementById("target0");
+                var actions_promise;
 
                 // When a pointer changes coordinates, the pointermove event must be dispatched.
                 // TA: 5.3
                 on_event(target0, "pointermove", function (event) {
                     detected_pointertypes[event.pointerType] = true;
-                    if (eventTested == false) {
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
                         test_pointermove.done();
-                        eventTested = true;
-                    }
+                    });
                 });
 
                 // Inject the inputs to run this test.
-                new test_driver.Actions().pointerMove(0, 0, {origin: target0}).send();
+                actions_promise = new test_driver.Actions().pointerMove(0, 0, {origin: target0}).send();
             }
         </script>
         <h1>Pointer Events pointermove Tests</h1>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_isprimary_same_as_pointerdown.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_isprimary_same_as_pointerdown.html
index 46bfe40b69e..3073076a49f 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_isprimary_same_as_pointerdown.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_isprimary_same_as_pointerdown.html
@@ -27,6 +27,7 @@
 
             function run() {
                 var target0 = document.getElementById("target0");
+                var actions_promise;
 
                 on_event(target0, "pointermove", function (event) {
                     if (pointerdown_event != null) {
@@ -47,11 +48,14 @@
                     test_pointerEvent.step(function () {
                         assert_not_equals(pointermove_event, null, "pointermove event was never received: ");
                     });
-                    test_pointerEvent.done(); // complete test
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
+                        test_pointerEvent.done();
+                    });
                 });
 
                 // Dispatch a mouse drag in target0.
-                new test_driver.Actions()
+                actions_promise = new test_driver.Actions()
                     .pointerMove(0, 0, {origin: target0})
                     .pointerDown()
                     .pointerMove(3, 3, {origin: target0})
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_on_chorded_mouse_button.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_on_chorded_mouse_button.html
index f65512832c8..06bb5f0e895 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_on_chorded_mouse_button.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointermove_on_chorded_mouse_button.html
@@ -26,7 +26,6 @@
         </h4>
         <div id="target0" style="background:black"></div>
         <script>
-            var eventTested = false;
             var detected_pointertypes = {};
             var test_pointermove = async_test("pointermove events received for button state changes");
             add_completion_callback(showPointerTypes);
@@ -36,6 +35,7 @@
 
             function run() {
                 var target0 = document.getElementById("target0");
+                var actions_promise;
 
                 // When a pointer changes button state and the circumstances produce no other pointer event, the pointermove event must be dispatched.
                 // 5.2.6
@@ -64,13 +64,15 @@
                     detected_pointertypes[event.pointerType] = true;
                     test_pointermove.step(function() {assert_true(step === 3, "The pointerup event must be triggered after pressing and releasing the second button.");});
                     test_pointermove.step(function() {assert_true(event.buttons === 0, "The pointerup event must be triggered by releasing the last pressed button.");});
-                    test_pointermove.done();
-                    eventTested = true;
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
+                        test_pointermove.done();
+                    });
                 });
 
                 // Click on both left and middle buttons.
                 var actions = new test_driver.Actions();
-                actions.pointerMove(0, 0, {origin: target0, button: actions.ButtonType.LEFT})
+                actions_promise = actions.pointerMove(0, 0, {origin: target0, button: actions.ButtonType.LEFT})
                     .pointerDown({button: actions.ButtonType.LEFT})
                     .pointerDown({button: actions.ButtonType.MIDDLE})
                     .pointerUp({button: actions.ButtonType.MIDDLE})
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_pen.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_pen.html
index a718468c49a..210055e6539 100644
--- a/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_pen.html
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_pointerout_pen.html
@@ -24,22 +24,22 @@
             // will fail unless the async_test is created with the var name "test_pointerEvent".
             add_completion_callback(showPointerTypes);
 
-            var eventTested = false;
             var isPointerupReceived = false;
             var detected_pointertypes = {};
 
             function run() {
                 var target0 = document.getElementById("target0");
+                var actions_promise;
 
                 // When a pen stylus leaves the hover range detectable by the digitizer the pointerout event must be dispatched.
                 // TA: 7.2
                 on_event(target0, "pointerout", function (event) {
                     detected_pointertypes[event.pointerType] = true;
                     if(event.pointerType == 'pen') {
-                        if (eventTested == false) {
-                            eventTested = true;
+                        // Make sure the test finishes after all the input actions are completed.
+                        actions_promise.then( () => {
                             test_pointerout.done();
-                        }
+                        });
                     }
                     else {
                         test_pointerout.step(function() {
@@ -50,7 +50,7 @@
                 });
 
                 // Inject pen inputs.
-                new test_driver.Actions()
+                actions_promise = new test_driver.Actions()
                   .addPointer("PenPointer1", "pen")
                   .pointerMove(0, 0, {origin: target0})
                   .pointerMove(0, 0)
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/requestDisplays.tentative.https.any.js b/tests/wpt/web-platform-tests/screen_enumeration/requestDisplays.tentative.https.any.js
new file mode 100644
index 00000000000..e2a5bc427de
--- /dev/null
+++ b/tests/wpt/web-platform-tests/screen_enumeration/requestDisplays.tentative.https.any.js
@@ -0,0 +1,21 @@
+// META: global=window,dedicatedworker,sharedworker,serviceworker
+'use strict';
+
+promise_test(async testCase => {
+  assert_class_string(navigator.screen, 'ScreenManager');
+  assert_equals(typeof navigator.screen.requestDisplays, 'function');
+}, 'navigator.screen.requestDisplays is present');
+
+promise_test(async testCase => {
+  const displays = await navigator.screen.requestDisplays();
+  assert_greater_than(displays.length, 0);
+  assert_equals(typeof displays[0].name, 'string');
+  assert_equals(typeof displays[0].scaleFactor, 'number');
+  assert_equals(typeof displays[0].width, 'number');
+  assert_equals(typeof displays[0].height, 'number');
+  assert_equals(typeof displays[0].left, 'number');
+  assert_equals(typeof displays[0].top, 'number');
+  assert_equals(typeof displays[0].colorDepth, 'number');
+  assert_equals(typeof displays[0].isPrimary, 'boolean');
+  assert_equals(typeof displays[0].isInternal, 'boolean');
+}, 'navigator.screen.requestDisplays returns at least 1 Display');
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/service-workers/tools/blink-import.py b/tests/wpt/web-platform-tests/service-workers/tools/blink-import.py
deleted file mode 100644
index 552fdc054cc..00000000000
--- a/tests/wpt/web-platform-tests/service-workers/tools/blink-import.py
+++ /dev/null
@@ -1,206 +0,0 @@
-from __future__ import print_function
-
-import os
-import re
-import shutil
-import glob
-import tempfile
-import sys
-from collections import defaultdict
-
-here = os.path.abspath(os.path.split(__file__)[0])
-
-def get_extra_files(chromium_root):
-    return [(os.path.join(chromium_root, "LayoutTests", "http", "tests", "resources", "testharness-helpers.js"),
-             os.path.join("resources", "testharness-helpers.js"))]
-
-resources_re = re.compile("/?(?:\.\./)*resources/(testharness(?:report)?)\.js")
-
-def resources_path(line, depth):
-    return False, resources_re.sub(r"/resources/\1.js", line)
-
-php_re = re.compile("\.php")
-
-def python_to_php(line, depth):
-    return False, php_re.sub(".py", line)
-
-abs_testharness_helpers_re = re.compile("([\"'])/resources/testharness-helpers.js")
-testharness_helpers_re = re.compile("\.\./((?:\.\./)*)resources/testharness-helpers.js")
-
-def testharness_helpers(line, depth):
-    if abs_testharness_helpers_re.findall(line):
-        return False, abs_testharness_helpers_re.sub(r"\1%sresources/testharness-helpers.js" % ("../" * (depth - 1)), line)
-    return False, testharness_helpers_re.sub(r"\1resources/testharness-helpers.js", line)
-
-serviceworker_path_re = re.compile("/serviceworker/")
-def service_worker_path(line, depth):
-    return False, serviceworker_path_re.sub("/service-workers/", line)
-
-localhost_re = re.compile("localhost")
-alt_host_re = re.compile("127\.0\.0\.1")
-port_http_re = re.compile("8000")
-port_https_re = re.compile("8000")
-
-
-def server_names(line, depth):
-    line, count_0 = localhost_re.subn("{{host}}", line)
-    line, count_1 = alt_host_re.subn("{{domains[www]}}", line)
-    line, count_2 = port_http_re.subn("{{ports[http][0]}}", line)
-    line, count_3 = port_https_re.subn("{{ports[https][0]}}", line)
-
-    count = count_0 + count_1 + count_2 + count_3
-
-    return bool(count), line
-
-
-def source_paths(chromium_root):
-    for dirpath, dirnames, filenames in os.walk(chromium_root):
-        if "chromium" in dirnames:
-            dirnames.remove("chromium")
-        for filename in filenames:
-            if filename.endswith("-expected.txt") or filename.endswith(".php"):
-                continue
-            yield os.path.relpath(os.path.join(dirpath, filename), chromium_root)
-
-
-def do_subs(path, line):
-    depth = len(os.path.split(os.path.sep))
-    subs = [resources_path, python_to_php, testharness_helpers, service_worker_path, server_names]
-    file_is_template = False
-    for sub in subs:
-        added_template, line = sub(line, depth)
-        if added_template:
-            file_is_template = True
-    return file_is_template, line
-
-def get_head(git):
-    return git("rev-parse", "HEAD")
-
-def get_changes(git, path, old, new):
-    data = git("diff", "--name-status", "-z", "--no-renames", "%s..%s" % (old, new), "--", path)
-    items = data.split("\0")
-    rv = defaultdict(list)
-    for status, path in items:
-        rv[status].append(path)
-
-    return rv
-
-def copy(src_path, out_dir, rel_path):
-    dest = os.path.normpath(os.path.join(out_dir, rel_path))
-    dest_dir = os.path.split(dest)[0]
-    if not os.path.exists(dest_dir):
-        os.makedirs(dest_dir)
-    shutil.copy2(src_path, dest)
-
-def copy_local_files(local_files, out_root, tmp_dir):
-    for path in local_files:
-        rel_path = os.path.relpath(path, out_root)
-        copy(path, tmp_dir, rel_path)
-
-def copy_extra_files(chromium_root, tmp_dir):
-    for in_path, rel_path in get_extra_files(chromium_root):
-        copy(in_path, tmp_dir, rel_path)
-
-def sub_changed_filenames(filename_changes, f):
-    rv = []
-    for line in f:
-        for in_name, out_name in filename_changes.iteritems():
-            line = line.replace(in_name, out_name)
-        rv.append(line)
-    return "".join(rv)
-
-testharness_re = re.compile("<script[^>]*src=[\"']?/resources/testharness.js[\"' ][^>]*>")
-
-def is_top_level_test(path, data):
-    if os.path.splitext(path)[1] != ".html":
-        return False
-    for line in data:
-        if testharness_re.findall(line):
-            return True
-    return False
-
-def add_suffix(path, suffix):
-    root, ext = os.path.splitext(path)
-    return root + ".%s" % suffix + ext
-
-def main():
-    if "--cache-tests" in sys.argv:
-        sw_path = os.path.join("LayoutTests", "http", "tests", "cachestorage")
-        out_root = os.path.abspath(os.path.join(here, "..", "cache-storage"))
-    elif "--sw-tests" in sys.argv:
-        sw_path = os.path.join("LayoutTests", "http", "tests", "serviceworkers")
-        out_root = os.path.abspath(os.path.join(here, "..", "service-worker"))
-    else:
-        raise ValueError("Must supply either --cache-tests or --sw-tests")
-
-    chromium_root = os.path.abspath(sys.argv[1])
-
-    work_path = tempfile.mkdtemp()
-
-    test_path = os.path.join(chromium_root, sw_path)
-
-    local_files = glob.glob(os.path.normpath(os.path.join(here, "..", "resources", "*.py")))
-
-    if not os.path.exists(out_root):
-        os.mkdir(out_root)
-
-    copy_local_files(local_files, out_root, work_path)
-    copy_extra_files(chromium_root, work_path)
-
-    path_changes = {}
-
-    for path in source_paths(test_path):
-        out_path = os.path.join(work_path, path)
-        out_dir = os.path.dirname(out_path)
-        if not os.path.exists(out_dir):
-            os.makedirs(out_dir)
-        with open(os.path.join(test_path, path), "r") as in_f:
-            data = []
-            sub = False
-            for line in in_f:
-                sub_flag, output_line = do_subs(path, line)
-                data.append(output_line)
-                if sub_flag:
-                    sub = True
-            is_test = is_top_level_test(out_path, data)
-
-        initial_path = out_path
-
-        if is_test:
-            path_1 = add_suffix(out_path, "https")
-        else:
-            path_1 = out_path
-
-        if sub:
-            path_2 = add_suffix(out_path, "sub")
-        else:
-            path_2 = path_1
-
-        if path_2 != initial_path:
-            path_changes[initial_path] = path_2
-
-        with open(path_2, "w") as out_f:
-            out_f.write("".join(data))
-
-    filename_changes = {}
-
-    for k, v in path_changes.iteritems():
-        if os.path.basename(k) in filename_changes:
-            print("Got duplicate name:" + os.path.basename(k))
-        filename_changes[os.path.basename(k)] = os.path.basename(v)
-
-    for path in source_paths(work_path):
-        full_path = os.path.join(work_path, path)
-        with open(full_path, "r") as f:
-            data = sub_changed_filenames(filename_changes, f)
-        with open(full_path, "w") as f:
-            f.write(data)
-
-    for dirpath, dirnames, filenames in os.walk(work_path):
-        for filename in filenames:
-            in_path = os.path.join(dirpath, filename)
-            rel_path = os.path.relpath(in_path, work_path)
-            copy(in_path, out_root, rel_path)
-
-if __name__ == "__main__":
-    main()
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-iceConnectionState.https.html b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-iceConnectionState.https.html
index c0ce25eb76b..8e853e4acbc 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-iceConnectionState.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-iceConnectionState.https.html
@@ -359,6 +359,7 @@ promise_test(async t => {
   pc1.candidateBuffer.forEach(c => pc1.addIceCandidate(c));
   delete pc1.candidateBuffer;
   await listenToIceConnected(pc1);
+  await listenToIceConnected(pc2);
   assert_array_equals(pc1.iceStates, ['new', 'checking', 'connected']);
   assert_array_equals(pc2.iceStates, ['new', 'checking', 'connected']);
 }, 'Responder ICE connection state behaves as expected');