diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
deleted file mode 100644
index f64b45fea6b..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-002.html]
-  [Hit test float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
deleted file mode 100644
index f29da48a2a0..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-003.html]
-  [Miss float below something else]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
deleted file mode 100644
index 4bfb0c2053a..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-
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/selectors/is-where-parsing.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/is-where-parsing.html.ini
new file mode 100644
index 00000000000..6a5a8e15d9f
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/is-where-parsing.html.ini
@@ -0,0 +1,28 @@
+[is-where-parsing.html]
+  [Nested :is]
+    expected: FAIL
+
+  [Pseudo-elements after]
+    expected: FAIL
+
+  [Nested :where]
+    expected: FAIL
+
+  [Pseudo-classes after]
+    expected: FAIL
+
+  [Multiple selectors with combinators]
+    expected: FAIL
+
+  [Combinators after]
+    expected: FAIL
+
+  [Nested inside :host, without combinators]
+    expected: FAIL
+
+  [Pseudo-classes inside]
+    expected: FAIL
+
+  [After part with simple pseudo-class]
+    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 b9b8b6fc366..bdc39570f43 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
@@ -318,15 +318,24 @@
   [<iframe>: separate response Content-Type: text/html;" \\" 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
-
   [<iframe>: separate response Content-Type: text/plain */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+    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
 
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 c7413d589dc..ac64b54cc99 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
@@ -62,3 +62,6 @@
   [separate text/javascript;charset=windows-1252  text/javascript]
     expected: FAIL
 
+  [separate text/javascript error]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
index 30e1b851fd4..7277f622b20 100644
--- a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20%2Cnosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
new file mode 100644
index 00000000000..385376c7321
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_4.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
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_escaping-1.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 88f4ddd0e9a..42ebcc9d57e 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-1.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 295031c1812..ab43ed7acf4 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index c792a071c3b..0407f0cc2b7 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
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 7a36937927c..f4f994c5d6f 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
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index 3ad8df021f5..34831fe756c 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,8 +1,13 @@
 [htmlanchorelement_noopener.html]
-  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name reuses an existing window with that name]
     expected: FAIL
 
   [Check that rel=noopener with target=_parent does a normal load]
-    expected: NOTRUN
+    expected: FAIL
+
+  [Check that rel=noopener with target=_top does a normal load]
+    expected: FAIL
+
+  [Check that rel=noopener with target=_self does a normal load]
+    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
index 5ddb9bfeff6..a1effd5f801 100644
--- 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
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini
rename to tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index e51f3daa7cd..0f36158da98 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -159548,6 +159548,32 @@
        {}
       ]
      ],
+     "first-letter-opacity-001-ref.html": [
+      "37e4dd5a2c9127d9cdbbb4ceb490033a9a8e6f0e",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/first-letter-opacity-001-not-ref.html",
+         "!="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "first-letter-opacity-001.html": [
+      "0a867e541aebf2032136930f30f5596759dd65e7",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/first-letter-opacity-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "first-letter-opacity-float-001.html": [
       "fb939fa0cb0adcadf1960291124c2e06d8949afc",
       [
@@ -159665,6 +159691,32 @@
        {}
       ]
      ],
+     "first-line-opacity-001-ref.html": [
+      "b4f4ddc185fc5e958f1934a0a1e948eee29e8057",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/first-line-opacity-001-not-ref.html",
+         "!="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "first-line-opacity-001.html": [
+      "83f90824b8ab42976a826fcc7567a9f7f52e4379",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/first-line-opacity-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "first-line-with-before-after.html": [
       "f91a22a4a7d65366dbd7dda3934c82c9b5776977",
       [
@@ -300534,6 +300586,10 @@
       "f63dd580aa8414c945a8fd2c99ccc6dca0e7a24d",
       []
      ],
+     "first-letter-opacity-001-not-ref.html": [
+      "d1844499baa4214445909b10cd758ebf0f7fe0ba",
+      []
+     ],
      "first-letter-opacity-float-001-ref.html": [
       "38c230045bd0cbec0d94da16b27fd56aa58456a1",
       []
@@ -300566,6 +300622,10 @@
       "7193bf25eb88c5443457480f7ce27782acd9473a",
       []
      ],
+     "first-line-opacity-001-not-ref.html": [
+      "d020842a24b227d234f440732287ed6566954d89",
+      []
+     ],
      "first-line-with-before-after-ref.html": [
       "fcee7995052717c0509c58a76fa1f420434ceb43",
       []
@@ -302138,6 +302198,18 @@
       "18163de30320bd1f0f1a7248cd4c2f2d2897d0c5",
       []
      ],
+     "tentative": {
+      "support": {
+       "README": [
+        "67e87ca8916c94045f6d55238d387d5571fd694a",
+        []
+       ],
+       "table-tentative.css": [
+        "255ec02587a42535445fa05956da3c6dde692411",
+        []
+       ]
+      }
+     },
      "toggle-row-display-property-001-ref.html": [
       "a99f69eb4498ae55312122d51ea518327cdf9e12",
       []
@@ -343801,7 +343873,7 @@
       []
      ],
      "lint.py": [
-      "c56720d9a3f712b184ce1491fa8cb85a3746197a",
+      "fc1a816f8abf85efce31a3a8e614ba591b600954",
       []
      ],
      "rules.py": [
@@ -344002,7 +344074,7 @@
        }
       },
       "test_file_lints.py": [
-       "b06104db694d1809e012535aac682ba064563aca",
+       "7dacfad6380dc8b668a22dc7c4fe2e74d375469f",
        []
       ],
       "test_lint.py": [
@@ -344055,7 +344127,7 @@
       []
      ],
      "sourcefile.py": [
-      "b324bf22dd382515220d3a78d9f2710430030aee",
+      "299ad212f7680e7517505667c6e09bd60ed0b7c4",
       []
      ],
      "testpaths.py": [
@@ -344080,7 +344152,7 @@
        []
       ],
       "test_sourcefile.py": [
-       "4d2080a70283be308898536708993c0843cfcebb",
+       "8b0fb944ea5674a7d21b8ddaac8908564d4441bb",
        []
       ],
       "test_utils.py": [
@@ -344101,7 +344173,7 @@
       []
      ],
      "vcs.py": [
-      "05afdf39b227dfc0dff1dfce44f36c7b252a33c7",
+      "7c0feeb816479975275b1a1c4d84f1215fac1406",
       []
      ]
     },
@@ -344166,7 +344238,7 @@
      ]
     },
     "requirements_flake8.txt": [
-     "3be95a40de7847a8328d0401a88353c62fe05a4d",
+     "ae16be3955fbf3d5fa9648967c6c8d397519013d",
      []
     ],
     "requirements_mypy.txt": [
@@ -394276,6 +394348,22 @@
        {}
       ]
      ],
+     "tentative": {
+      "caption.html": [
+       "0d09dafb4a36335c9f28c6187e4cab23434a49a0",
+       [
+        null,
+        {}
+       ]
+      ],
+      "column-widths.html": [
+       "52cb5b6fb0502cd63e2404168cfd413d86d60b6e",
+       [
+        null,
+        {}
+       ]
+      ]
+     },
      "visibility-collapse-col-001.html": [
       "15368aceec3efa09fd1cf4fe30fb32c5932ec5c3",
       [
@@ -404896,6 +404984,13 @@
        {}
       ]
      ],
+     "is-where-parsing.html": [
+      "0f064bab73c4a46bd6c11aa456cf0bfd94cdaae8",
+      [
+       null,
+       {}
+      ]
+     ],
      "missing-right-token.html": [
       "8fe33a95795354117177f78eae7f1081ef0b1947",
       [
@@ -468076,6 +468171,13 @@
         {}
        ]
       ],
+      "displaystyle-3.html": [
+       "544590cf9e10c623739e2c5a49cd60f5a3ed7477",
+       [
+        null,
+        {}
+       ]
+      ],
       "ignored-properties-001.html": [
        "e3e38067d877837f92f3dde8c37a3ceca233bd9d",
        [
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
deleted file mode 100644
index f64b45fea6b..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-002.html]
-  [Hit test float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
deleted file mode 100644
index f29da48a2a0..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-003.html]
-  [Miss float below something else]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
deleted file mode 100644
index 4bfb0c2053a..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-
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/selectors/is-where-parsing.html.ini b/tests/wpt/metadata/css/selectors/is-where-parsing.html.ini
new file mode 100644
index 00000000000..6a5a8e15d9f
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/is-where-parsing.html.ini
@@ -0,0 +1,28 @@
+[is-where-parsing.html]
+  [Nested :is]
+    expected: FAIL
+
+  [Pseudo-elements after]
+    expected: FAIL
+
+  [Nested :where]
+    expected: FAIL
+
+  [Pseudo-classes after]
+    expected: FAIL
+
+  [Multiple selectors with combinators]
+    expected: FAIL
+
+  [Combinators after]
+    expected: FAIL
+
+  [Nested inside :host, without combinators]
+    expected: FAIL
+
+  [Pseudo-classes inside]
+    expected: FAIL
+
+  [After part with simple pseudo-class]
+    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 36ea5a82f1f..473ad084148 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -318,15 +318,24 @@
   [<iframe>: separate response Content-Type: text/html;" \\" 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
-
   [<iframe>: separate response Content-Type: text/plain */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
+    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
 
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 c7413d589dc..ac64b54cc99 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -62,3 +62,6 @@
   [separate text/javascript;charset=windows-1252  text/javascript]
     expected: FAIL
 
+  [separate text/javascript error]
+    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 30e1b851fd4..7277f622b20 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20%2Cnosniff]
+    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
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[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_4.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
new file mode 100644
index 00000000000..385376c7321
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_4.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
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_escaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 2a166bb97b7..fc37df7e3fa 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_escaping-1.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 5f60c78e73c..b3bd9f4c289 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 06bbed1fcac..d43f38b40cd 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
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 dc856a3d5a3..e440b1e38c6 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
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index 806a12f305d..bfcdef49b4b 100644
--- a/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,12 +1,17 @@
 [htmlanchorelement_noopener.html]
   type: testharness
-  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name ignores an existing window with that name]
     expected: NOTRUN
 
   [Check that rel=noopener with target=_parent does a normal load]
-    expected: NOTRUN
+    expected: FAIL
 
   [Check that targeting of rel=noopener with a given name reuses an existing window with that name]
     expected: FAIL
 
+  [Check that rel=noopener with target=_top does a normal load]
+    expected: FAIL
+
+  [Check that rel=noopener with target=_self does a normal load]
+    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 5ddb9bfeff6..a1effd5f801 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
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/with-ports/017.html.ini b/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata/webmessaging/with-ports/018.html.ini
rename to tests/wpt/metadata/webmessaging/without-ports/018.html.ini
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-not-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-not-ref.html
new file mode 100644
index 00000000000..d1844499baa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-not-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Reference mismatch: ::first-letter supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+</head>
+<body>
+  <p>First</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-ref.html
new file mode 100644
index 00000000000..37e4dd5a2c9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Reference: ::first-letter supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+<link rel="mismatch" href="first-letter-opacity-001-not-ref.html">
+  <style>
+    fl {
+      opacity: 0;
+    }
+  </style>
+</head>
+<body>
+  <p><fl>F</fl>irst</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001.html
new file mode 100644
index 00000000000..0a867e541ae
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-letter-opacity-001.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Test: ::first-letter supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+<link rel="match" href="first-letter-opacity-001-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#first-letter-styling">
+  <style>
+    p::first-letter {
+      opacity: 0;
+    }
+  </style>
+</head>
+<body>
+  <p>First</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-not-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-not-ref.html
new file mode 100644
index 00000000000..d020842a24b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-not-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Reference mismatch: ::first-line supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+</head>
+<body>
+  <p>First<br>Second</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-ref.html
new file mode 100644
index 00000000000..b4f4ddc185f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Reference: ::first-line supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+<link rel="mismatch" href="first-line-opacity-001-not-ref.html">
+  <style>
+    fl {
+      opacity: 0;
+    }
+  </style>
+</head>
+<body>
+  <p><fl>First</fl><br>Second</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001.html
new file mode 100644
index 00000000000..83f90824b8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-opacity-001.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Test: ::first-line supports opacity.</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1639664">
+<link rel="match" href="first-line-opacity-001-ref.html">
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#first-line-styling">
+  <style>
+    p::first-line {
+      opacity: 0;
+    }
+  </style>
+</head>
+<body>
+  <p>First<br>Second</p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/tentative/caption.html b/tests/wpt/web-platform-tests/css/css-tables/tentative/caption.html
new file mode 100644
index 00000000000..0d09dafb4a3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/tentative/caption.html
@@ -0,0 +1,131 @@
+<!doctype html>
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+<script src="/resources/check-layout-th.js"></script>
+<title>caption</title>
+<meta name="flags" content="ahem">
+<link rel="stylesheet" type="text/css" href="./support/table-tentative.css">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<link rel="author" title="Aleks Totic" href="atotic@chromium.org" />
+<link rel="help" href="https://html.spec.whatwg.org/multipage/tables.html#the-caption-element"/>
+<link rel="help" href="https://www.w3.org/TR/css-tables-3/#bounding-box-assignment" />
+<style>
+  main table {
+    border-spacing: 0 0;
+    position:relative;
+    background: gray;
+  }
+  main td {
+    background: #BFB;
+  }
+  main caption {
+    background: yellow;
+  }
+  main caption > div {
+    display: inline-block;
+    background: rgba(0,0,0,0.1);
+  }
+  main caption > div:after {
+    content: "c";
+  }
+  .lh {
+    line-height:30px;
+  }
+</style>
+<h1>Caption sizing and positioning</h1>
+<p class="error">There is a fundamental disagreement between Chrome Legacy and Firefox on caption size influence on table width. Chrome uses caption min width as lower limit of table's grid box, FF does not. Firefox also does not support multiple captions.</p>
+
+<main>
+
+<h2>Caption width limits</h2>
+
+<p class="testdesc">Caption minmax and grid width
+caption.min is lower limit of grid min.</p>
+<table>
+  <caption data-expected-width=50><div style="width:50px"></div><div style="width:30px"></caption>
+  <td data-expected-width=50>auto</td>
+</table>
+
+<p class="testdesc">Caption.min vs caption.css_width
+Caption.css_width is upper limit of caption.min
+Caption.css_width is lower limit of caption.min
+</p>
+<table>
+  <caption style="width:100px" data-expected-width=100><div style="width:200px"></div></caption>
+  <td data-expected-width=100>auto</td>
+</table>
+<table>
+  <caption style="width:300px" data-expected-width=300><div style="width:200px"></div></caption>
+  <td data-expected-width=300>auto</td>
+</table>
+
+
+<p class="testdesc">Caption width:50%
+Percent width is resolved wrt to table width.</p>
+<table style="width:200px">
+  <caption style="width:50%" data-expected-width=100><div></div></caption>
+  <td data-expected-width=200>auto</td>
+</table>
+
+<table style="width:200px">
+  <caption style="width:50%" data-expected-width=100><div style="width:200px"></div></caption>
+  <td data-expected-width=200>auto</td>
+</table>
+
+<p class="testdesc">Caption height:80%
+github spec <a href="https://github.com/w3c/csswg-drafts/issues/4676">issue</a>.
+TablesNG will not resolve percentage heights per spec. FF agrees.
+</p>
+<table style="width:200px;height:100px">
+  <caption style="height:80%" data-expected-height=30><div style="height:30px"></div></caption>
+  <td data-expected-width=200>auto</td>
+</table>
+
+<p class="testdesc">Multiple captions
+Do we allow multiple captions? There are 4 in this test.</p>
+<table>
+  <caption class="lh" data-offset-y=0>over1</caption>
+  <caption class="lh" data-offset-y=30>over2</caption>
+  <caption class="lh" style="caption-side:bottom" data-offset-y=90>under1</caption>
+  <caption class="lh" style="caption-side:bottom" data-offset-y=120>under2</caption>
+  <td class="lh" data-offset-y=60>2 above me, 2 below me?</td>
+</table>
+<p class="testdesc">Caption margins
+Margins between captions do not collapse</p>
+<table style="width:200px">
+  <caption class="lh" style="margin:20px;" data-offset-y=20 data-offset-x=20>20px margins</caption>
+  <td data-expected-width=200 data-offset-y=70>1 caption</td>
+</table>
+<table style="width:200px">
+  <caption class="lh" style="margin:20px;" data-offset-y=20 data-offset-x=20>20px margins</caption>
+  <caption class="lh" style="margin:20px;" data-offset-y=90 data-offset-x=20>20px margins</caption>
+  <td data-expected-width=200 data-offset-y=140>2 captions</td>
+</table>
+
+
+<p class="testdesc">Caption margins auto
+auto margins center captions that are less wide than the table.
+</p>
+<table style="width:200px">
+  <caption class="lh" style="margin:auto" data-offset-x=0><div style="width:100px">auto margins</div></caption>
+  <td data-expected-width=200>1 caption</td>
+</table>
+<table style="width:200px">
+  <caption class="lh" style="margin:auto;width:50%" data-offset-x=50><div style="width:100px">auto margins</div></caption>
+  <td data-expected-width=200>1 caption</td>
+</table>
+
+
+<p class="testdesc">Vertical writing mode caption
+</p>
+<table>
+  <caption style="writing-mode:vertical-rl;height:min-content;font:10px Ahem;color:rgba(0,0,0,0.3)" data-expected-height=100 ><div style="height:100px;">vertical</div> caption bigger than table</caption>
+  <tbody data-offset-y=100>
+    <td>vertical!</td>
+  </tbody>
+</table>
+
+</main>
+<script>
+  checkLayout("table");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/tentative/column-widths.html b/tests/wpt/web-platform-tests/css/css-tables/tentative/column-widths.html
new file mode 100644
index 00000000000..52cb5b6fb05
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/tentative/column-widths.html
@@ -0,0 +1,284 @@
+<!doctype html>
+<title>Column widths</title>
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+<script src="/resources/check-layout-th.js"></script>
+<link rel="stylesheet" type="text/css" href="./support/table-tentative.css">
+<link rel="author" title="Aleks Totic" href="atotic@chromium.org" />
+<link rel="help" href="https://www.w3.org/TR/css-tables-3/#distributing-width-to-columns" />
+<style>
+  main table {
+    background: gray;
+    border-spacing: 8px 8px;
+    table-layout: auto;
+    margin-top: 4px;
+  }
+  main td {
+    background: #BFB;
+    font-size: 10px;
+  }
+  main td > div {
+    display: inline-block;
+    background: rgba(56,162,56,0.3);
+  }
+</style>
+<main>
+<h1>Col width</h1>
+<p>how does col width interact with td widths to produce final column width?</p>
+<p>Inputs are colgroup/col widths, and td widths.
+<p>td widths merge, then merge again with col to produce column widths.
+<p>Output is column min/max/percent w0dths.
+<p>Colgroup/col has css min_width, css max_width, css percent.</p>
+<p>TD has intrinsic minmax, css width, css percent width, css max width, css min width</p>
+
+<h2>Initial cell assignment</h2>
+
+
+<p class="testdesc">Unconstrained single TD, table-layout:auto
+td.min = minmax.min
+td.max = minmax.max</p>
+<table style="width:1px" data-expected-width=266>
+  <tr>
+    <td><div style="width:50px">min</div><div style="width:250px">min</div></td>
+  </tr>
+</table>
+<table data-expected-width=316>
+  <tr>
+    <td><div style="width:50px">max</div><div style="width:250px">max</div></td>
+  </tr>
+</table>
+
+<p class="testdesc">Unconstrained single TD, table-layout:fixed
+td.min = 0
+td.max = minmax.max</p>
+<table style="width:1px;table-layout:fixed" data-expected-width=16>
+  <tr>
+    <td><div style="width:50px">min</div><div style="width:250px">min</div></td>
+  </tr>
+</table>
+<table style="table-layout:fixed;width:300px" data-expected-width=300>
+  <tr>
+    <td><div style="width:50px">max</div><div style="width:250px">max</div></td>
+  </tr>
+</table>
+
+<p class="testdesc">Constrained single TD, table-layout:auto
+  td.min = minmax.min
+  td.max = max(minmax.min, css.width)
+</p>
+<table data-expected-width=266>
+  <tr>
+    <td style="width:200px"><div style="width:50px">max</div><div style="width:250px">max</div></td>
+  </tr>
+</table>
+<table data-expected-width=416>
+  <tr>
+    <td style="width:400px"><div style="width:50px">max</div><div style="width:250px">max</div></td>
+  </tr>
+</table>
+<table style="width:1px" data-expected-width=26>
+  <tr>
+    <td style="width:50px"><div style="width:10px">min</div></td>
+  </tr>
+</table>
+<table data-expected-width=266>
+  <tr>
+    <td style="width:100px"><div style="width:50px">min</div><div style="width:250px">min</div></td>
+  </tr>
+</table>
+<table data-expected-width=416>
+  <tr>
+    <td style="width:400px"><div style="width:50px">min</div><div style="width:250px">min</div></td>
+  </tr>
+</table>
+
+
+<h2>TD/TD merging</h2>
+
+<p>TD merging only happens in auto, in fixed only 1st row gets measured</p>
+
+<p class="testdesc">Two unconstrained TDs, table-layout:auto or fixed
+  td.min = max(C0.min, C1.min). always 0 in fixed layout.
+  td.max = max(C0.max, C1.max)
+</p>
+<table data-expected-width=316>
+  <tr>
+    <td data-expected-width=300><div style="width:50px">auto</div><div style="width:250px">max</div></td>
+  </tr>
+  <tr>
+    <td><div style="width:100px">auto</div><div style="width:150px">auto</div></td>
+  </tr>
+</table>
+<table style="width:1px" data-expected-width=266>
+  <tr>
+    <td data-expected-width=250><div style="width:50px">auto</div><div style="width:250px">max</div></td>
+  </tr>
+  <tr>
+    <td><div style="width:100px">auto</div><div style="width:150px">auto</div></td>
+  </tr>
+</table>
+
+<p class="testdesc">Unconstrained (UN) and constrained (CON) TD
+  td.min = max(UN.min, CON.min)
+  td.max = max(UN.min, CON.max)
+</p>
+<p class="error">Chrome Legacy and Edge fail this test. They do not limit unconstrained maximum: td.max = max(UN.max, CON.max).</p>
+<table style="width:1px" data-expected-width=36>
+  <tr>
+    <td style="width:50px" data-expected-width=20><div style="width:20px">min</div></td>
+  </tr>
+  <tr>
+    <td><div style="width:15px">min</div></td>
+  </tr>
+</table>
+<table data-expected-width=66>
+  <tr>
+    <td style="width:50px" data-expected-width=50><div style="width:20px">max</div></td>
+  </tr>
+  <tr>
+    <td><div style="width:40px">max</div><div style="width:40px">max</div></td>
+  </tr>
+</table>
+
+<p class="testdesc">Two percent TDs
+  td.percent = max(C1.percent, C2.percent)
+  td.max = max(C1.max, C2.max)
+  td.min = max(C1.min, C2.min)
+</p>
+<table data-expected-width=324>
+  <tr>
+  <td style="width:10%"><div style="width:60px">60</div></td>
+  <td>auto</td>
+</tr>
+<tr>
+  <td style="width:20%" data-expected-width=60><div style="width:50px">50</div></td>
+  <td data-expected-width=240>auto</td>
+</tr>
+</table>
+
+<h2>COL/TD merging</h2>
+
+<p class="testdesc">col auto td auto
+column.min = td.min
+column.max = td.max</p>
+<table data-expected-width=66>
+  <col>
+  <td><div style="width:50px">auto</div></td>
+</table>
+
+<p class="testdesc">col fixed td auto
+  column.min = td.min
+  column.max = max(col[px], td.min)
+</p>
+<table data-expected-width=116>
+  <col style="width:100px">
+  <td><div style="width:50px">auto</div></td>
+</table>
+<table data-expected-width=126>
+  <col style="width:100px">
+  <td><div style="width:110px">110</div><div style="width:110px">110</div></td>
+</table>
+<table style="width:1px" data-expected-width=66>
+  <col style="width:100px">
+  <td><div style="width:50px">min</div></td>
+</table>
+
+<p class="testdesc">col % td auto
+column.min = td.min
+column.max = max(td.max, col.max)
+column.percent = col[%]
+<table data-expected-width=224>
+  <col style="width:80%">
+  <td><div style="width:50px">auto</div></td>
+  <td style="width:40px">40</td>
+</table>
+<table style="width:1px" data-expected-width=94>
+  <col style="width:80%">
+  <td style="width:50px"><div style="width:30px">auto</div></td>
+  <td><div style="width:40px"></div></td>
+</table>
+<table data-expected-width=274>
+  <col style="width:80%">
+  <td><div style="width:200px" data-expected-width=200>auto</div></td>
+  <td style="width:30px"><div style="width:30px">30</div></td>
+</table>
+
+<p class="testdesc">col auto td percent
+column.min = td.min
+column.max = td.max
+column.percent = td.percent
+<table data-expected-width=174>
+  <col>
+  <td style="width:80%" data-expected-width=120><div style="width:100px">auto</div></td>
+  <td ><div style="width:30px">10</div></td>
+</table>
+
+<p class="testdesc">col fixed td percent
+column.min = td.min
+column.max = max(td.max, col.max)
+column.percent = td.percent
+<table data-expected-width=424>
+  <col style="width:200px">
+  <td style="width:50%" data-expected-width=200><div style="width:50px">50</div></td>
+  <td><div style="width:50px">50</div>
+</table>
+<table style="width:1px" data-expected-width=124>
+  <col style="width:200px">
+  <td style="width:60%" data-expected-width=50><div style="width:50px">50</div></td>
+  <td><div style="width:50px">50</div>
+</table>
+
+<p class="testdesc">col percent td percent
+column.min = td.min
+column.max = max(td.max, col.max)
+column.percent = max(td.percent, col.percent)</p>
+<table data-expected-width=524>
+  <col style="width:60%">
+  <td style="width:50%" data-expected-width=300><div style="width:100px">100</div></td>
+  <td><div style="width:200px">200</div></td>
+</table>
+<table data-expected-width=524>
+  <col style="width:50%">
+  <td style="width:60%" data-expected-width=300><div style="width:100px">100</div></td>
+  <td><div style="width:200px">200</div></td>
+</table>
+
+<p class="testdesc">col auto td fixed
+column.min = td.min
+column.max = td.max</p>
+<table data-expected-width=116>
+  <col>
+  <td style="width:100px">100</td>
+</table>
+
+<p class="testdesc">col fixed td fixed
+column.min = td.min
+column.max = max(td.max, col.max)</p>
+<table data-expected-width=216>
+  <col style="width:200px">
+  <td style="width:100px">100</td>
+</table>
+<table data-expected-width=216>
+  <col style="width:100px">
+  <td style="width:200px">100</td>
+</table>
+
+<p class="testdesc">col percent td fixed
+column.min = td.min
+column.percent = col.percent
+column.max = max(td.max, col.max)</p>
+<table data-expected-width=424>
+  <col style="width:50%">
+  <td style="width:100px" data-expected-width=200>100</td>
+  <td><div style="width:200px">200</div>
+</table>
+
+<table style="width:1px" data-expected-width=234>
+  <col style="width:50%">
+  <td style="width:100px" data-expected-width=10><div style="width:10px">10</div></td>
+  <td><div style="width:200px">200</div>
+</table>
+</main>
+<script>
+  checkLayout("table");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/tentative/support/README b/tests/wpt/web-platform-tests/css/css-tables/tentative/support/README
new file mode 100644
index 00000000000..67e87ca8916
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/tentative/support/README
@@ -0,0 +1,13 @@
+This test suite is created as part of Chrome's NG table rewrite in 2020.
+TablesNG: https://crbug.com/958381
+
+Many parts of table layout algorithm have been left unspecified by the
+existing specification:
+https://www.w3.org/TR/css-tables-3/
+
+These tests are an attempt to exaustively test all parts of the
+algorithm. When specification did not specify the algorithm,
+the proposed algorithm is described in the tests.
+
+Our goal is that these tests will guide creation of a more complete
+table standard.
diff --git a/tests/wpt/web-platform-tests/css/css-tables/tentative/support/table-tentative.css b/tests/wpt/web-platform-tests/css/css-tables/tentative/support/table-tentative.css
new file mode 100644
index 00000000000..255ec02587a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/tentative/support/table-tentative.css
@@ -0,0 +1,34 @@
+/*
+Tables-ng test styling.
+
+Usage:
+
+<link rel="stylesheet" type="text/css" href="./support/tables-ng.css">
+<p class="testdesc">Short description here
+  Analysis
+<p class="error">Current disagreements between browsers</p>
+*/
+main td {
+  padding: 0;
+}
+.error {
+  color: #b70000;
+}
+p {
+  margin-top:4px;
+  margin-bottom:4px;
+}
+body {
+  counter-reset: testid;
+}
+.testdesc {
+  white-space: pre-line;
+  margin-top: 16px;
+}
+.testdesc:before {
+  content: counter(testid) ". ";
+  counter-increment: testid;
+}
+.testdesc:first-line {
+  font-family: monospace;
+}
diff --git a/tests/wpt/web-platform-tests/css/selectors/is-where-parsing.html b/tests/wpt/web-platform-tests/css/selectors/is-where-parsing.html
new file mode 100644
index 00000000000..0f064bab73c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/is-where-parsing.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<title>CSS Selectors: :is() and :where() parsing</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#zero-matches">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  function assert_valid(expected_valid, pattern, description) {
+    test(function() {
+      for (let pseudo of ["is", "where"]) {
+        let valid = false;
+        let selector = pattern.replace("{}", ":" + pseudo)
+        try {
+          document.querySelector(selector);
+          valid = true;
+        } catch (ex) {}
+
+        assert_equals(valid, expected_valid, `${description}: ${selector}`);
+      }
+    }, description);
+  }
+
+  assert_valid(true, "{}(div + bar, div ~ .baz)", "Multiple selectors with combinators");
+
+  assert_valid(true, "{}(:is(div))", "Nested :is");
+  assert_valid(true, "{}(:where(div))", "Nested :where");
+
+  assert_valid(true, ":host({}(div))", "Nested inside :host, without combinators");
+  // See https://github.com/w3c/csswg-drafts/issues/5093
+  assert_valid(false, ":host({}(div .foo))", "Nested inside :host, with combinators");
+
+  assert_valid(true, "{}(:hover, :active)", "Pseudo-classes inside");
+  assert_valid(true, "{}(div):hover", "Pseudo-classes after");
+  assert_valid(true, "{}(div)::before", "Pseudo-elements after");
+  assert_valid(false, "{}(::before)", "Pseudo-elements inside");
+
+  assert_valid(true, "{}(div) + bar", "Combinators after");
+  assert_valid(true, "::part(foo):is(:hover)", "After part with simple pseudo-class");
+  assert_valid(false, "::part(foo):is([attr='value'])", "After part with invalid selector after");
+</script>
diff --git a/tests/wpt/web-platform-tests/mathml/relations/css-styling/displaystyle-3.html b/tests/wpt/web-platform-tests/mathml/relations/css-styling/displaystyle-3.html
new file mode 100644
index 00000000000..544590cf9e1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/mathml/relations/css-styling/displaystyle-3.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>displaystyle</title>
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#css-styling">
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#the-displaystyle-and-scriptlevel-attributes">
+<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#the-math-style-property">
+<meta name="assert" content="Verify the displaystyle of the underover element is considered (not the one of its base) to determine whether to move limits.">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+  math, math *  {
+    font-family: Ahem;
+    font-size: 20px;
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/feature-detection.js"></script>
+<script>
+  setup({ explicit_done: true });
+  window.addEventListener("load", () => { document.fonts.ready.then(runTests); });
+  function runTests() {
+      ["munder", "mover", "munderover"].forEach((tag) => {
+          Array.from(document.getElementsByTagName(tag)).forEach(e => {
+              var displaystyle = e.getAttribute('displaystyle') === "true";
+              test(function() {
+                  assert_true(MathMLFeatureDetection.has_movablelimits());
+                  var elementRight = e.getBoundingClientRect().right;
+                  var baseRight = e.firstElementChild.getBoundingClientRect().right;
+                  if (displaystyle)
+                      assert_approx_equals(elementRight, baseRight, 1);
+                  else
+                      assert_greater_than(elementRight, baseRight + 10);
+              }, `movablelimits for ${tag} element (displaystyle=${displaystyle})`);
+          });
+      });
+      done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+  <math>
+    <munder displaystyle="false">
+      <mo displaystyle="true" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+    </munder>
+  </math>
+  <math>
+    <mover displaystyle="false">
+      <mo displaystyle="true" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+    </mover>
+  </math>
+  <math>
+    <munderover displaystyle="false">
+      <mo displaystyle="true" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+      <mtext>X</mtext>
+    </munderover>
+  </math>
+  <math>
+    <munder displaystyle="true">
+      <mo displaystyle="false" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+    </munder>
+  </math>
+  <math>
+    <mover displaystyle="true">
+      <mo displaystyle="false" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+    </mover>
+  </math>
+  <math>
+    <munderover displaystyle="true">
+      <mo displaystyle="false" movablelimits="true">XX</mo>
+      <mtext>X</mtext>
+      <mtext>X</mtext>
+    </munderover>
+  </math>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/tools/lint/lint.py b/tests/wpt/web-platform-tests/tools/lint/lint.py
index c56720d9a3f..fc1a816f8ab 100644
--- a/tests/wpt/web-platform-tests/tools/lint/lint.py
+++ b/tests/wpt/web-platform-tests/tools/lint/lint.py
@@ -467,6 +467,7 @@ def check_parsed(repo_root, path, f):
 
         if (source_file.type != "support" and
             not source_file.name_is_reference and
+            not source_file.name_is_tentative and
             not source_file.spec_links):
             return [rules.MissingLink.error(path)]
 
diff --git a/tests/wpt/web-platform-tests/tools/lint/tests/test_file_lints.py b/tests/wpt/web-platform-tests/tools/lint/tests/test_file_lints.py
index b06104db694..7dacfad6380 100644
--- a/tests/wpt/web-platform-tests/tools/lint/tests/test_file_lints.py
+++ b/tests/wpt/web-platform-tests/tools/lint/tests/test_file_lints.py
@@ -796,6 +796,20 @@ def test_css_missing_file_manual():
     ]
 
 
+def test_css_missing_file_tentative():
+    code = b"""\
+<html xmlns="http://www.w3.org/1999/xhtml">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</html>
+"""
+
+    # The tentative flag covers tests that make assertions 'not yet required by
+    # any specification', so they need not have a specification link.
+    errors = check_file_contents("", "css/foo/bar.tentative.html", six.BytesIO(code))
+    assert not errors
+
+
 @pytest.mark.parametrize("filename", [
     "foo.worker.js",
     "foo.any.js",
diff --git a/tests/wpt/web-platform-tests/tools/manifest/sourcefile.py b/tests/wpt/web-platform-tests/tools/manifest/sourcefile.py
index b324bf22dd3..299ad212f76 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/sourcefile.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/sourcefile.py
@@ -407,6 +407,15 @@ class SourceFile(object):
         # type: () -> bool
         return self.type_flag == "crash" or "crashtests" in self.dir_path.split(os.path.sep)
 
+    @property
+    def name_is_tentative(self):
+        # type: () -> bool
+        """Check if the file name matches the conditions for the file to be a
+        tentative file.
+
+        See https://web-platform-tests.org/writing-tests/file-names.html#test-features"""
+        return "tentative" in self.meta_flags
+
     @property
     def markup_type(self):
         # type: () -> Optional[Text]
diff --git a/tests/wpt/web-platform-tests/tools/manifest/tests/test_sourcefile.py b/tests/wpt/web-platform-tests/tools/manifest/tests/test_sourcefile.py
index 4d2080a7028..8b0fb944ea5 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/tests/test_sourcefile.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/tests/test_sourcefile.py
@@ -122,6 +122,14 @@ def test_name_is_reference(rel_path):
     assert items(s) == []
 
 
+def test_name_is_tentative():
+    s = create("css/css-ui/appearance-revert-001.tentative.html")
+    assert s.name_is_tentative
+
+    s = create("css/css-ui/appearance-revert-001.html")
+    assert not s.name_is_tentative
+
+
 def test_worker():
     s = create("html/test.worker.js")
     assert not s.name_is_non_test
diff --git a/tests/wpt/web-platform-tests/tools/manifest/vcs.py b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
index 05afdf39b22..7c0feeb8164 100644
--- a/tests/wpt/web-platform-tests/tools/manifest/vcs.py
+++ b/tests/wpt/web-platform-tests/tools/manifest/vcs.py
@@ -226,12 +226,12 @@ class GitIgnoreCache(CacheFile, MutableMapping):  # type: ignore
 
     def check_valid(self, data):
         # type: (Dict[Any, Any]) -> Dict[Any, Any]
-        ignore_path = os.path.join(self.tests_root, b".gitignore")
+        ignore_path = os.path.join(self.tests_root, ".gitignore")
         mtime = os.path.getmtime(ignore_path)
-        if data.get(b"/gitignore_file") != [ignore_path, mtime]:
+        if data.get("/gitignore_file") != [ignore_path, mtime]:
             self.modified = True
             data = {}
-            data[b"/gitignore_file"] = [ignore_path, mtime]
+            data["/gitignore_file"] = [ignore_path, mtime]
         return data
 
     def __contains__(self, key):
diff --git a/tests/wpt/web-platform-tests/tools/requirements_flake8.txt b/tests/wpt/web-platform-tests/tools/requirements_flake8.txt
index 3be95a40de7..ae16be3955f 100644
--- a/tests/wpt/web-platform-tests/tools/requirements_flake8.txt
+++ b/tests/wpt/web-platform-tests/tools/requirements_flake8.txt
@@ -1,4 +1,4 @@
-flake8==3.8.1
+flake8==3.8.2
 pycodestyle==2.6.0
 pyflakes==2.2.0
 pep8-naming==0.10.0