diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index 628b1fab770..c884dc82eab 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
@@ -2,3 +2,6 @@
   [listeners are called when <iframe> is resized]
     expected: FAIL
 
+  [listeners are called correct number of times]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
index 23c61ede1a1..c131078eace 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
@@ -17,6 +17,3 @@
   [test the top of layer]
     expected: FAIL
 
-  [test some point of the element: top left corner]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index b3313a165c1..61d9ed1b81f 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
@@ -315,15 +315,18 @@
   [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/plain;charset=gbk text/html]
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
index 5c001592859..d2df9b78483 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
@@ -56,6 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
index c12c0f8ae48..6852d7663de 100644
--- a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
@@ -1,4 +1,8 @@
 [skip-document-with-fragment.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with URL fragments should be skipped.]
     expected: FAIL
 
+  [Autofocus elements in top-level browsing context's documents with URI fragments should be skipped.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index af14e19a466..f45aaafe1c5 100644
--- a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,20 +1,16 @@
 [supported-elements.html]
-  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
   [Host element with delegatesFocus including no focusable descendants should be skipped]
-    expected: NOTRUN
+    expected: FAIL
 
   [Element with tabindex should support autofocus]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Area element should support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
   [Host element with delegatesFocus should support autofocus]
-    expected: NOTRUN
-
-  [Non-HTMLElement should not support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index f4f994c5d6f..7a36937927c 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini
new file mode 100644
index 00000000000..3ef70e3095b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini
@@ -0,0 +1,4 @@
+[image-loading-lazy-srcset.html]
+  [loading='lazy' image with srcset]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
new file mode 100644
index 00000000000..4d4449c983e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -0,0 +1,20 @@
+[promise-job-entry.html]
+  expected: TIMEOUT
+  [Fulfillment handler on fulfilled promise]
+    expected: FAIL
+
+  [Rejection handler on pending-then-rejected promise]
+    expected: TIMEOUT
+
+  [Sanity check: this all works as expected with no promises involved]
+    expected: FAIL
+
+  [Thenable resolution]
+    expected: FAIL
+
+  [Rejection handler on rejected promise]
+    expected: FAIL
+
+  [Fulfillment handler on pending-then-fulfilled promise]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
index 60a5016a4e6..02596a53395 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
@@ -68,3 +68,6 @@
   [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44053 more errors.\n\tMax AbsError of 1.9999977350234985e+0 at index of 28001.\n\t[28001\]\t9.9999773502349854e-1\t-1.0000000000000000e+0\t1.9999977350234985e+0\t1.9999977350234985e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
     expected: FAIL
 
+  [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44055 more errors.\n\tMax AbsError of 1.9999977350234985e+0 at index of 32411.\n\t[32411\]\t9.9999773502349854e-1\t-1.0000000000000000e+0\t1.9999977350234985e+0\t1.9999977350234985e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index 7d458325041..c299d1e869b 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -110,3 +110,9 @@
   [X Stitched sine-wave buffers at sample rate 44100 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":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t-3.0409904191139748e-29\t5.6332010030746460e-1\t5.6332010030746460e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\t[31081\]\t4.5842077961922066e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 6.1397600173950195e-1 at index of 31081.\n\tMax RelError of 1.0000000000000000e+0 at index of 31080.\n]
     expected: FAIL
 
+  [X SNR (-205.02772078615203 dB) is not greater than or equal to 85.58. Got -205.02772078615203.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 44100 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":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t2.6490511032320000e+12\t5.6332010030746460e-1\t2.6490511032314365e+12\t4.7025680457444414e+12\t9.0957000000000003e-5\n\t[31081\]\t4.5700546817025259e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 2.6490511032314365e+12 at index of 31080.\n\tMax RelError of 4.7025680457444414e+12 at index of 31080.\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 7d8cd33e49c..899bcfc6d36 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -149151,6 +149151,19 @@
         {}
        ]
       ],
+      "clip-path-reference-box-002.html": [
+       "a45e4537fc2d4e14965eaee8a0e639d45c606b27",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/clip-path-reference-box-002-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "clip-path-reference-box-003.html": [
        "ac88439d7b2e70a235b7b991b83450083fb8a94c",
        [
@@ -189447,6 +189460,19 @@
        {}
       ]
      ],
+     "will-change-abspos-cb-002.html": [
+      "537f671cdce8321fe81f1281a3faa5b5ecbe64db",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-abspos-cb-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "will-change-abspos-cb-dynamic-001.html": [
       "d2503256bcfe2336068914fb780463d4987608b5",
       [
@@ -189460,6 +189486,58 @@
        {}
       ]
      ],
+     "will-change-fixedpos-cb-001.html": [
+      "249413b6d79d1fc27e8642863b1fae1abfc88cd7",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "will-change-fixedpos-cb-002.html": [
+      "00cba5ecf864d439e2413184af6255cc4b15bfc2",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "will-change-fixedpos-cb-003.html": [
+      "e7dcf2c880deca3402a03af201e14b4a95bca307",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-003-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "will-change-stacking-context-001.html": [
+      "9720953205b1cd2863649f2b69e6e01b5107acb2",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-stacking-context-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "will-change-transform-image.html": [
       "edce6c1f9bfa840004d8e82e6720be9c18bd23b6",
       [
@@ -295425,6 +295503,10 @@
         "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
         []
        ],
+       "clip-path-reference-box-002-ref.html": [
+        "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
+        []
+       ],
        "clip-path-reference-box-003-ref.html": [
         "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
         []
@@ -305011,6 +305093,26 @@
       "f81b9d2a2947bdaa5fd2d33dd9dd5f59dc730a11",
       []
      ],
+     "will-change-abspos-cb-002-ref.html": [
+      "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
+      []
+     ],
+     "will-change-fixedpos-cb-001-ref.html": [
+      "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
+      []
+     ],
+     "will-change-fixedpos-cb-002-ref.html": [
+      "7823c16075e133cf57731d196cee180d9a03cae4",
+      []
+     ],
+     "will-change-fixedpos-cb-003-ref.html": [
+      "05957327c331a953cc907eeb5ffd2ba117f6f227",
+      []
+     ],
+     "will-change-stacking-context-001-ref.html": [
+      "38138ebcac3d73796e00173f6a84ba7edaa17cd2",
+      []
+     ],
      "will-change-transform-image-ref.html": [
       "d42d5b7fea22d3d2bc2abf782b1efc78f261f69e",
       []
@@ -313300,7 +313402,7 @@
       []
      ],
      "index.md": [
-      "11e2c5fa1f4abdd57acda63c3709fb42ad6faf6d",
+      "2bcfb1f0bf27b4a33f8f8abad4e9a8513805e658",
       []
      ],
      "lint-tool.md": [
@@ -436947,6 +437049,13 @@
          {}
         ]
        ],
+       "image-loading-lazy-srcset.html": [
+        "21c11c7233c7b8f845a31b6aa25dda14ca381960",
+        [
+         null,
+         {}
+        ]
+       ],
        "image-loading-lazy.html": [
         "0c1c39a8ae95f0b978f3b2a3ebd822598295372b",
         [
@@ -445793,6 +445902,17 @@
       ]
      },
      "timers": {
+      "cleartimeout-clearinterval.any.js": [
+       "44551aa8a1bb802e65cd48a0dd7586e0e564e2e8",
+       [
+        "html/webappapis/timers/cleartimeout-clearinterval.any.html",
+        {}
+       ],
+       [
+        "html/webappapis/timers/cleartimeout-clearinterval.any.worker.html",
+        {}
+       ]
+      ],
       "evil-spec-example.html": [
        "77a8746908d74257e27ef6f936a0266bb4298a44",
        [
diff --git a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index 628b1fab770..c884dc82eab 100644
--- a/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
@@ -2,3 +2,6 @@
   [listeners are called when <iframe> is resized]
     expected: FAIL
 
+  [listeners are called correct number of times]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
index 5733d536fd3..85e94926cb3 100644
--- a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
@@ -21,6 +21,3 @@
   [test the top of layer]
     expected: FAIL
 
-  [test some point of the element: top left corner]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 78de5ebec3f..d9d224c6417 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -315,15 +315,18 @@
   [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/plain;charset=gbk text/html]
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     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 5c001592859..d2df9b78483 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,6 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
index c12c0f8ae48..6852d7663de 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
@@ -1,4 +1,8 @@
 [skip-document-with-fragment.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with URL fragments should be skipped.]
     expected: FAIL
 
+  [Autofocus elements in top-level browsing context's documents with URI fragments should be skipped.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 8b743f36e1d..6b68e9094e4 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,20 +1,16 @@
 [supported-elements.html]
-  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
   [Element with tabindex should support autofocus]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Host element with delegatesFocus including no focusable descendants should be skipped]
-    expected: NOTRUN
+    expected: FAIL
 
   [Area element should support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
   [Host element with delegatesFocus should support autofocus]
-    expected: NOTRUN
-
-  [Non-HTMLElement should not support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index e440b1e38c6..dc856a3d5a3 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini
new file mode 100644
index 00000000000..3ef70e3095b
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html.ini
@@ -0,0 +1,4 @@
+[image-loading-lazy-srcset.html]
+  [loading='lazy' image with srcset]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index a1effd5f801..4d4449c983e 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,9 +1,10 @@
 [promise-job-entry.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
index 93b59ad6eb8..35bd1b1ba84 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
@@ -137,3 +137,6 @@
   [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44053 more errors.\n\tMax AbsError of 1.9999977350234985e+0 at index of 28001.\n\t[28001\]\t9.9999773502349854e-1\t-1.0000000000000000e+0\t1.9999977350234985e+0\t1.9999977350234985e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
     expected: FAIL
 
+  [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44055 more errors.\n\tMax AbsError of 1.9999977350234985e+0 at index of 32411.\n\t[32411\]\t9.9999773502349854e-1\t-1.0000000000000000e+0\t1.9999977350234985e+0\t1.9999977350234985e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
+    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 c1d7882c6a4..3d7cfd76d97 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
@@ -341,3 +341,9 @@
   [X Stitched sine-wave buffers at sample rate 44100 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":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t-3.0409904191139748e-29\t5.6332010030746460e-1\t5.6332010030746460e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\t[31081\]\t4.5842077961922066e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 6.1397600173950195e-1 at index of 31081.\n\tMax RelError of 1.0000000000000000e+0 at index of 31080.\n]
     expected: FAIL
 
+  [X SNR (-205.02772078615203 dB) is not greater than or equal to 85.58. Got -205.02772078615203.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 44100 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":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t2.6490511032320000e+12\t5.6332010030746460e-1\t2.6490511032314365e+12\t4.7025680457444414e+12\t9.0957000000000003e-5\n\t[31081\]\t4.5700546817025259e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 2.6490511032314365e+12 at index of 31080.\n\tMax RelError of 4.7025680457444414e+12 at index of 31080.\n]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-reference-box-002.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-reference-box-002.html
new file mode 100644
index 00000000000..a45e4537fc2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-reference-box-002.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>CSS Masking: clip path with floated element</title>
+<link rel="author" title="Fredrik Söderquist" href="mailto:fs@opera.com">
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=418484">
+<link rel="match" href="reference/clip-path-reference-box-002-ref.html">
+<meta name="assert" content="Check that the 'clip-path' property uses the border box as the reference box.">
+
+<style>
+.clipped {
+  width: 100px;
+  height: 200px;
+  background-color: green;
+  clip-path: polygon(0% 0%,100% 0%,100% 50%,0% 50%);
+}
+</style>
+<div class="clipped">
+  <div style="float:left; margin-left:-100px; margin-top:-100px;">&nbsp;</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-reference-box-002-ref.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-reference-box-002-ref.html
new file mode 100644
index 00000000000..f718ea6abfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-reference-box-002-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="width: 100px; height: 100px; background-color: green"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002-ref.html
new file mode 100644
index 00000000000..9dfc24c526b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    border: 1px solid green;
+    background: green;
+    margin-top: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002.html
new file mode 100644
index 00000000000..537f671cdce
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-002.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: filter should generate a containing block for absolute positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="match" href="will-change-abspos-cb-002-ref.html">
+<style>
+  .container {
+    border: 1px solid green;
+    background: red;
+    width: 100px;
+    height: 100px;
+    margin-top: 100px;
+    will-change: filter;
+  }
+  .abspos {
+    position: absolute;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<div class="container">
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001-ref.html
new file mode 100644
index 00000000000..9dfc24c526b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    border: 1px solid green;
+    background: green;
+    margin-top: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001.html
new file mode 100644
index 00000000000..249413b6d79
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-001.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: filter should generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-001-ref.html">
+<style>
+  .container {
+    border: 1px solid green;
+    background: red;
+    width: 100px;
+    height: 100px;
+    margin-top: 100px;
+    will-change: filter;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<div class="container">
+  <div class="fixedpos"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002-ref.html
new file mode 100644
index 00000000000..7823c16075e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002-ref.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    background: green;
+    margin-left: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002.html
new file mode 100644
index 00000000000..00cba5ecf86
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-002.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: filter on an inline should generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-002-ref.html">
+<style>
+  .inline {
+    margin-left: 100px;
+    will-change: filter;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<span class="inline">
+  <!-- "FAIL" should be hidden by the green box and should not be visible. -->
+  FAIL
+  <div class="fixedpos"></div>
+</span>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003-ref.html
new file mode 100644
index 00000000000..05957327c33
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003-ref.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  body {
+    margin: 0;
+  }
+  .hidden {
+    width: 100px;
+    height: 100px;
+    margin-left: 100px;
+    margin-top: 200px;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 100px;
+    left: 100px;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+  .spacer {
+    height: 2000px;
+  }
+</style>
+<div class="hidden"></div>
+<div class="fixedpos"></div>
+<div class="spacer"></div>
+<script>
+  window.onload = function() { window.scrollTo(0, 100); };
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003.html
new file mode 100644
index 00000000000..e7dcf2c880d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: filter on the root should not generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-003-ref.html">
+<style>
+  html {
+    will-change: filter;
+  }
+  body {
+    margin: 0;
+  }
+  .hidden {
+    width: 100px;
+    height: 100px;
+    background: red;
+    margin-left: 100px;
+    margin-top: 200px;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 100px;
+    left: 100px;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+  .spacer {
+    height: 2000px;
+  }
+</style>
+<!-- This object should be fully hidden by the fixed position object. -->
+<div class="hidden"></div>
+<div class="fixedpos"></div>
+<div class="spacer"></div>
+<script>
+  window.onload = function() { window.scrollTo(0, 100); };
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001-ref.html
new file mode 100644
index 00000000000..38138ebcac3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001-ref.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    background: green;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001.html
new file mode 100644
index 00000000000..9720953205b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-001.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: filter should create a stacking context.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="match" href="will-change-stacking-context-001-ref.html">
+<style>
+  .indicator {
+    position: absolute;
+    background-color: green;
+    z-index: 1;
+  }
+  .willchange {
+    will-change: filter;
+    z-index: 0;
+  }
+  .child {
+    position: relative;
+    background-color: red;
+    z-index: 2;
+  }
+  .box {
+    width: 100px;
+    height: 100px;
+  }
+</style>
+
+<div class="indicator box"></div>
+<div class="willchange box">
+  <!-- Because will-change: filter creates a stacking context, this child
+       remains on bottom even though it has a higher z-index than the indicator
+       box. -->
+  <div class="child box"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/index.md b/tests/wpt/web-platform-tests/docs/writing-tests/index.md
index 11e2c5fa1f4..2bcfb1f0bf2 100644
--- a/tests/wpt/web-platform-tests/docs/writing-tests/index.md
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/index.md
@@ -46,7 +46,7 @@ behavior. The tests can be classified based on the way they express
 expectations:
 
 * Rendering tests should be used to verify that the browser graphically
-  displays pages as expected. See the [rendering test guidelines][rendering]
+  displays pages as expected. See the [rendering test guidelines](rendering)
   for tips on how to write great rendering tests. There are a few different
   ways to write rendering tests:
 
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html
new file mode 100644
index 00000000000..21c11c7233c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/the-img-element/image-loading-lazy-srcset.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<head>
+<title>loading='lazy' image with srcset</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/images.html#update-the-image-data">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/images.html#will-lazy-load-image-steps">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<div style="height:1000vh;"></div>
+<img srcset="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAIAAAAC64paAAAAG0lEQVR42mP8z0A%2BYKJA76jmUc2jmkc1U0EzACKcASfOgGoMAAAAAElFTkSuQmCC" loading="lazy">
+<img loading="lazy" srcset="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAIAAAAC64paAAAAG0lEQVR42mP8z0A%2BYKJA76jmUc2jmkc1U0EzACKcASfOgGoMAAAAAElFTkSuQmCC">
+<script>
+promise_test(async t => {
+  let loaded_images = 0;
+  const imgs = document.querySelectorAll("img");
+  imgs.forEach(img => {
+    img.addEventListener("load", () => { loaded_images++; }, { once: true });
+  });
+
+  await new Promise(resolve => window.addEventListener("load", resolve));
+
+  assert_equals(loaded_images, 0,
+                "lazy-load images with srcset shouldn't be loaded yet");
+
+  const promises = [
+    new Promise(resolve => imgs[0].addEventListener("load", resolve)),
+    new Promise(resolve => imgs[1].addEventListener("load", resolve)),
+  ];
+
+  imgs[1].scrollIntoView();
+  await Promise.all(promises);
+
+  imgs.forEach(img => {
+    assert_true(img.complete,
+                "Now the lazy-load image with srcset should be loaded");
+  });
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/timers/cleartimeout-clearinterval.any.js b/tests/wpt/web-platform-tests/html/webappapis/timers/cleartimeout-clearinterval.any.js
new file mode 100644
index 00000000000..44551aa8a1b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/webappapis/timers/cleartimeout-clearinterval.any.js
@@ -0,0 +1,29 @@
+async_test((t) => {
+  const handle = setTimeout(
+    t.step_func(() => {
+      assert_unreached("Timeout was not canceled");
+    }),
+    0
+  );
+
+  clearInterval(handle);
+
+  setTimeout(() => {
+    t.done();
+  }, 100);
+}, "Clear timeout with clearInterval");
+
+async_test((t) => {
+  const handle = setInterval(
+    t.step_func(() => {
+      assert_unreached("Interval was not canceled");
+    }),
+    0
+  );
+
+  clearTimeout(handle);
+
+  setTimeout(() => {
+    t.done();
+  }, 100);
+}, "Clear interval with clearTimeout");