diff --git a/etc/taskcluster/decision_task.py b/etc/taskcluster/decision_task.py
index c06ebc8e58f..6516c1304ab 100644
--- a/etc/taskcluster/decision_task.py
+++ b/etc/taskcluster/decision_task.py
@@ -646,8 +646,15 @@ def wpt_chunks(platform, make_chunk_task, build_task, total_chunks, processes,
                     --processes $PROCESSES \
                     --log-raw test-wpt-py3.log \
                     --log-errorsummary wpt-py3-errorsummary.log \
+                    --always-succeed \
                     url \
                     | cat
+                ./mach filter-intermittents \
+                    wpt-py3-errorsummary.log \
+                    --log-intermittents wpt-py3-intermittents.log \
+                    --log-filteredsummary filtered-py3-errorsummary.log \
+                    --tracker-api default \
+                    --reporter-api default
                 time ./mach test-wpt --release --product=servodriver --headless  \
                     tests/wpt/mozilla/tests/mozilla/DOMParser.html \
                     tests/wpt/mozilla/tests/css/per_glyph_font_fallback_a.html \
diff --git a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
index 76b44d9e9cf..3605e8f3fc9 100644
--- a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -4,7 +4,7 @@
     expected: TIMEOUT
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Fetching a blob URL immediately before revoking it works in an iframe.]
     expected: FAIL
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-004.html.ini
similarity index 67%
rename from tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
rename to tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
index f29da48a2a0..4bfb0c2053a 100644
--- 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-004.html.ini
@@ -1,4 +1,4 @@
-[hit-test-floats-003.html]
+[hit-test-floats-004.html]
   [Miss float below something else]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change-nested.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change-nested.html.ini
new file mode 100644
index 00000000000..a43af90e4d1
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change-nested.html.ini
@@ -0,0 +1,2 @@
+[dynamic-baseline-change-nested.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change.html.ini
new file mode 100644
index 00000000000..ea9b964da9e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/dynamic-baseline-change.html.ini
@@ -0,0 +1,2 @@
+[dynamic-baseline-change.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/table-item-flex-percentage-width.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/table-item-flex-percentage-width.html.ini
new file mode 100644
index 00000000000..a0f901c6558
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/table-item-flex-percentage-width.html.ini
@@ -0,0 +1,2 @@
+[table-item-flex-percentage-width.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini
new file mode 100644
index 00000000000..37be1af1eeb
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini
@@ -0,0 +1,2 @@
+[transform-interpolation-rotate-slerp.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
index f8e7e539aae..4a1e8110f6f 100644
--- a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
new file mode 100644
index 00000000000..4c79907309b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
@@ -0,0 +1,4 @@
+[CaretPosition-001.html]
+  [Element at (400, 100)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
deleted file mode 100644
index e181af5397f..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[elementsFromPoint-invalid-cases.html]
-  [The root element is the last element returned for otherwise empty queries within the viewport]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini
deleted file mode 100644
index 239c35135e4..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/offsetTopLeft-border-box.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[offsetTopLeft-border-box.html]
-  [container: 1]
-    expected: FAIL
-
-  [container: 0]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini
deleted file mode 100644
index 3174060ac0e..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[ttwf-cssom-doc-ext-load-count.html]
-  [stylesheet-1.css should be loaded and styleSheets.length === 1]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-001.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-001.html.ini
new file mode 100644
index 00000000000..99d21825015
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-001.html.ini
@@ -0,0 +1,7 @@
+[not-001.html]
+  [precondition]
+    expected: FAIL
+
+  [Invalidation of sibling combinators in :not()]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-002.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-002.html.ini
new file mode 100644
index 00000000000..9eaa0b2b190
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/invalidation/not-002.html.ini
@@ -0,0 +1,19 @@
+[not-002.html]
+  [Invalidate :not() for simple selector arguments.]
+    expected: FAIL
+
+  [Invalidate :not() for compound selector arguments.]
+    expected: FAIL
+
+  [Test specificity of :not().]
+    expected: FAIL
+
+  [Preconditions.]
+    expected: FAIL
+
+  [Invalidate :not() for complex selector arguments.]
+    expected: FAIL
+
+  [Invalidate nested :is() inside :not().]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/is-default-ns-002.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/is-default-ns-002.html.ini
new file mode 100644
index 00000000000..b8de9607a92
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/is-default-ns-002.html.ini
@@ -0,0 +1,2 @@
+[is-default-ns-002.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/not-complex.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/not-complex.html.ini
new file mode 100644
index 00000000000..3ada8da5b89
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/not-complex.html.ini
@@ -0,0 +1,2 @@
+[not-complex.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/not-default-ns-001.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/not-default-ns-001.html.ini
new file mode 100644
index 00000000000..2e7e90b9ee0
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/not-default-ns-001.html.ini
@@ -0,0 +1,2 @@
+[not-default-ns-001.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/not-specificity.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/not-specificity.html.ini
new file mode 100644
index 00000000000..f4dad41b375
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/not-specificity.html.ini
@@ -0,0 +1,25 @@
+[not-specificity.html]
+  [:not(span, :not(:not(.a#foo)), p) wins over :not(span, #foo, p)]
+    expected: FAIL
+
+  [:not(div#foo) wins over :not(#foo)]
+    expected: FAIL
+
+  [:not(span, li, p) wins over :not(span, lo, p)]
+    expected: FAIL
+
+  [:not(#foo) wins over :not(.foo)]
+    expected: FAIL
+
+  [:not(span + span) wins over :not(span)]
+    expected: FAIL
+
+  [:not(.bar, #foo) has same specificity as :not(#foo, .bar)]
+    expected: FAIL
+
+  [:not(.bar, #foo) wins over :not(.foo, .bar)]
+    expected: FAIL
+
+  [:not(span, #foo, p) wins over :not(span, :where(.a#foo), p)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/selectors/parsing/parse-not.html.ini b/tests/wpt/metadata-layout-2020/css/selectors/parsing/parse-not.html.ini
new file mode 100644
index 00000000000..c52f597e5fc
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/selectors/parsing/parse-not.html.ini
@@ -0,0 +1,25 @@
+[parse-not.html]
+  [":not(span.a, div.b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(:not(foo))" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b ~ c)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b ~ c, .d .e)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a + .b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(:host(:not(.a)))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:host)" should be a valid selector]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/custom-elements/element-internals-shadowroot.html.ini b/tests/wpt/metadata-layout-2020/custom-elements/element-internals-shadowroot.html.ini
new file mode 100644
index 00000000000..c485c2d79ab
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/custom-elements/element-internals-shadowroot.html.ini
@@ -0,0 +1,2 @@
+[element-internals-shadowroot.html]
+  expected: ERROR
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 07723f1beea..627eca9ff8f 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
@@ -315,21 +315,18 @@
   [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+  [<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]
+  [<iframe>: separate response Content-Type: text/html */*]
     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 646a46c0cbb..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
@@ -56,9 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    expected: FAIL
-
-  [separate text/javascript error]
-    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
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-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
deleted file mode 100644
index 385376c7321..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_4.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
index 8e2b6af33d8..9a85a905394 100644
--- a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,8 +1,7 @@
 [embedded-opener-remove-frame.html]
-  expected: TIMEOUT
   [opener of discarded nested browsing context]
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
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 93673c2a0db..338d283eb0e 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 +1,4 @@
 [iframe_sandbox_popups_escaping-3.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 0c89d5253df..1b74d6e073d 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-1.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     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 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/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/metadata-layout-2020/html/syntax/parsing/DOMContentLoaded-defer.html.ini
new file mode 100644
index 00000000000..a9677391662
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/syntax/parsing/DOMContentLoaded-defer.html.ini
@@ -0,0 +1,4 @@
+[DOMContentLoaded-defer.html]
+  [The end: DOMContentLoaded and defer scripts]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
deleted file mode 100644
index fca4d908c89..00000000000
--- a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[module-static-import-delayed.html]
-  [document.write in an imported module]
-    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 a1effd5f801..5ddb9bfeff6 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
@@ -1,9 +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
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/url/percent-encoding.window.js.ini b/tests/wpt/metadata-layout-2020/url/percent-encoding.window.js.ini
new file mode 100644
index 00000000000..7c7f82336bf
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/url/percent-encoding.window.js.ini
@@ -0,0 +1,22 @@
+[percent-encoding.window.html]
+  [Input † with encoding windows-1252]
+    expected: FAIL
+
+  [Input − with encoding shift_jis]
+    expected: FAIL
+
+  [Input \x0eA with encoding iso-2022-jp]
+    expected: FAIL
+
+  [Input  with encoding gb18030]
+    expected: FAIL
+
+  [Input † with encoding big5]
+    expected: FAIL
+
+  [Input † with encoding euc-kr]
+    expected: FAIL
+
+  [Input ‾\\ with encoding iso-2022-jp]
+    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/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 78ae3f75794..aefc4d366d2 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
@@ -236,3 +236,9 @@
   [X SNR (-384.8648378962337 dB) is not greater than or equal to 65.737. Got -384.8648378962337.]
     expected: FAIL
 
+  [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[28696\]\t6.5015347726526008e+23\t9.3139332532882690e-1\t6.5015347726526008e+23\t6.9804395155583112e+23\t3.8985999999999999e-3\n\t[28697\]\t7.0477002859115601e-1\t9.0675884485244751e-1\t2.0198881626129150e-1\t2.2275913536212616e-1\t3.8985999999999999e-3\n\tMax AbsError of 6.5015347726526008e+23 at index of 28696.\n\tMax RelError of 6.9804395155583112e+23 at index of 28696.\n]
+    expected: FAIL
+
+  [X SNR (-432.82623184916594 dB) is not greater than or equal to 65.737. Got -432.82623184916594.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
index f1281b5ae81..b7e13cf7726 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
@@ -1,5 +1,4 @@
 [audiocontext-not-fully-active.html]
-  expected: TIMEOUT
   [frame in navigated remote-site frame]
     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/018.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
rename to tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini
diff --git a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
index d4f62ed7113..faa00f45ecf 100644
--- a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: TIMEOUT
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index dd9fc22916d..f7e83fb749e 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -70,7 +70,16 @@
        null,
        {}
       ]
-     ]
+     ],
+     "content-visibility": {
+      "content-visibility-form-controls-crash.html": [
+       "6c9634dc1f3605ff20e68241d1f50ff93c8268b2",
+       [
+        null,
+        {}
+       ]
+      ]
+     }
     },
     "css-flexbox": {
      "fixedpos-video-in-abspos-quirk-crash.html": [
@@ -132990,6 +132999,19 @@
        {}
       ]
      ],
+     "contain-size-replaced-007.html": [
+      "6a17057bdd5b54f5fa53530afc790bdf8bde8277",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "contain-size-scrollbars-001.html": [
       "26f0d81da8ceac6df92325bf33d15d01c0d3d432",
       [
@@ -138299,6 +138321,32 @@
        {}
       ]
      ],
+     "dynamic-baseline-change-nested.html": [
+      "803b31410dbe07b56d39019de8426dc2575b4e7c",
+      [
+       null,
+       [
+        [
+         "/css/css-flexbox/dynamic-baseline-change-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "dynamic-baseline-change.html": [
+      "f13b87f0c1431010137bc76d516f92173c7aa1ed",
+      [
+       null,
+       [
+        [
+         "/css/css-flexbox/dynamic-baseline-change-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "dynamic-bsize-change.html": [
       "7148f26e2770b669dfcc69435e3a506882ffd457",
       [
@@ -143255,7 +143303,7 @@
       ]
      ],
      "gap-006-lr.html": [
-      "93dd65ad467cc22e1e3a9b5afd892520fe76fb51",
+      "ae4101cecfa08b51a9fdbc9ebe00f92f34c47fc1",
       [
        null,
        [
@@ -143268,7 +143316,7 @@
       ]
      ],
      "gap-006-ltr.html": [
-      "e5124806ea5b1d4d11748655e1c192fdaa084e3e",
+      "705d98cbf52ef9382b9a4ef542723d6d6e8c9bbf",
       [
        null,
        [
@@ -143281,7 +143329,7 @@
       ]
      ],
      "gap-006-rl.html": [
-      "ed6d02ec0cce4532d85814687db8b31624543850",
+      "e37baec59be69fe9d5b8f29627b72b2722f2e298",
       [
        null,
        [
@@ -143294,7 +143342,7 @@
       ]
      ],
      "gap-006-rtl.html": [
-      "ebbb60a18c091677883b7cb8333950d5399f4341",
+      "eb52910dc0b21991b8424009f42966cd498c0b5a",
       [
        null,
        [
@@ -144491,6 +144539,19 @@
        {}
       ]
      ],
+     "table-item-flex-percentage-width.html": [
+      "f21b5f0c6562c3970ae95202f5e3adf7a3deb489",
+      [
+       null,
+       [
+        [
+         "/css/css-flexbox/table-item-flex-percentage-width-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "table-with-float-paint.html": [
       "da78a0a576b375a85f7f63ce97093e9ab90e614b",
       [
@@ -166192,8 +166253,8 @@
        {}
       ]
      ],
-     "position-absolute-center-001.tentative.html": [
-      "1baf1d7827d7a1c08f30693c1ce9735ac99b52f7",
+     "position-absolute-center-001.html": [
+      "13af3f0e9f7184155b7edf09fb7a7a5580238fb2",
       [
        null,
        [
@@ -166205,8 +166266,8 @@
        {}
       ]
      ],
-     "position-absolute-center-002.tentative.html": [
-      "2de625f3925360d2290a5588c05de4bcee474234",
+     "position-absolute-center-002.html": [
+      "825143521a2354839c078350647684467621a9d8",
       [
        null,
        [
@@ -168263,6 +168324,19 @@
        {}
       ]
      ],
+     "first-line-with-inline-block.html": [
+      "12e11a3d2e4344b57c755b8a7e749115b299e549",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/reference/first-line-with-inline-block-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "first-line-with-out-of-flow-and-nested-div.html": [
       "e277e9ce1cb69bcc1c7a61c8a100585e077bd359",
       [
@@ -175326,6 +175400,136 @@
         ],
         {}
        ]
+      ],
+      "zero-or-infinity-001.html": [
+       "d2ed6cfb2345d715645a8514d759052c4c446589",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-002.html": [
+       "28470dd8756ebb3cb2463ff89e72f61d1f837a99",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-003.html": [
+       "ad0c3bf176b30981068730ef083d0f2218103544",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-004.html": [
+       "58db88c3bc1d8aba7b32fa378c1fe3f25c592ed4",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-005.html": [
+       "2892028f94075306176947c2419b8a86f7a113c2",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-006.html": [
+       "f34aa6c126c839a068f627b34ca16ef59aca3bb7",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-007.html": [
+       "97e602612f43e1f7fdb75fbceaa01dc8f4e2d397",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-008.html": [
+       "644090aa3ceae774244535a43736a4fc6a406bdd",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-009.html": [
+       "6e320cf5410744103625655d5c93151a50b34d9b",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "zero-or-infinity-010.html": [
+       "92b4750157defc2ac43c22fe47ba768b871d5672",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "auto-scrollbar-inside-stf-abspos.html": [
@@ -190732,6 +190936,19 @@
        {}
       ]
      ],
+     "text-decoration-color-selection-pseudo-01.html": [
+      "0df1d477ef72b6ec521bb7b91eeb4531fc435a8c",
+      [
+       null,
+       [
+        [
+         "/css/css-text-decor/reference/text-decoration-color-selection-pseudo-01-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "text-decoration-color.html": [
       "1e1353d9fa67ea6ef0019fc499dfeaafae65fe87",
       [
@@ -191610,6 +191827,32 @@
        {}
       ]
      ],
+     "text-underline-offset-overline-vertical.html": [
+      "b95afc2c1d8e9599244de1d6df8d70a0c07aa1b2",
+      [
+       null,
+       [
+        [
+         "/css/css-text-decor/reference/text-underline-offset-overline-vertical-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "text-underline-offset-overline.html": [
+      "cca8c1c110f4dc515d0b93121403813bae58db65",
+      [
+       null,
+       [
+        [
+         "/css/css-text-decor/reference/text-underline-offset-overline-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "text-underline-offset-scroll-001.html": [
       "ee521fa215c7b9102ec6a6805c2866bf433c10a4",
       [
@@ -191666,6 +191909,19 @@
        {}
       ]
      ],
+     "text-underline-offset-vertical-003.html": [
+      "0addc49e50e13877037d998ce8f5f65fc5c523c5",
+      [
+       null,
+       [
+        [
+         "/css/css-text-decor/reference/text-underline-offset-vertical-003-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "text-underline-position-001a.html": [
       "f79fc9d39fe1a5e5ff21a4c7d16d2becc00a3e96",
       [
@@ -191773,6 +192029,19 @@
         {}
        ]
       ],
+      "transform-interpolation-rotate-slerp.html": [
+       "ac11801bd40137c8a7aa46ecbcef407cc32f65e4",
+       [
+        null,
+        [
+         [
+          "/css/css-transforms/animation/transform-interpolation-ref.html?rotateSlerp",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "transform-interpolation-rotate.html": [
        "9d94d83424d5732a9bdac7be252dccb1cb421aab",
        [
@@ -222086,6 +222355,32 @@
        ]
       ]
      },
+     "is-default-ns-001.html": [
+      "1c9a5a29e559891f8460cacbb35776f5d76825bf",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "is-default-ns-002.html": [
+      "b86337f16793a62e2364f90122daf0b5ccb2cf6a",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "is-default-ns-003.html": [
       "410d1221ec0f0a8baf4f29f9d1ff1e34e26cd854",
       [
@@ -222125,6 +222420,45 @@
        {}
       ]
      ],
+     "not-default-ns-001.html": [
+      "ff8f540bc37d1ddcba81254af0693de891644620",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "not-default-ns-002.html": [
+      "3d70ed0a87ea02291feec22f0a87250216502953",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "not-default-ns-003.html": [
+      "f5aab27fab48f8f306028aadb3994d9f91fd4bfb",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "not-links.html": [
       "58cef1a282e8e5a2d7ce17d614e9c4b15ce1ccf6",
       [
@@ -258082,7 +258416,7 @@
       []
      ],
      "content-type-and-body.py": [
-      "1c8c4c7ec16129b0c60094262edd456c83a52da1",
+      "9b1e880c2fa06b45aa8b683a679a66a585291b75",
       []
      ],
      "inspect-header.py": [
@@ -301653,6 +301987,10 @@
       "ef2d7661beeba5b22d047e2c2e9149fd05aba437",
       []
      ],
+     "dynamic-baseline-change-ref.html": [
+      "af030931ddad15ca5613b29ae6c468f9a04c53db",
+      []
+     ],
      "dynamic-bsize-change-ref.html": [
       "b8db7ea2c7de6443075e04009ff5c979dbb7fed3",
       []
@@ -302408,19 +302746,19 @@
       []
      ],
      "gap-006-lr-ref.html": [
-      "d840f47e57c0460b7696522e4ece578604ecea21",
+      "0de73376ee9f9ad5d2b3e4db4b6d93746c146177",
       []
      ],
      "gap-006-ltr-ref.html": [
-      "893acc50bd1e0a1baed739b184f846e62f958b89",
+      "65d9eaf32f196d8633dc8672f68db5adbc760055",
       []
      ],
      "gap-006-rl-ref.html": [
-      "0679fadba9401c7c43a89caa3745bfd3b60b6018",
+      "9b64f122f6f1efb9052bec897cda72b6d45d2cdd",
       []
      ],
      "gap-006-rtl-ref.html": [
-      "3eeec3d0ae4e4a2662fcaccdb49bd3be9049c02b",
+      "3f64a75269d59a276943b46c6a47fa96b1cab7a2",
       []
      ],
      "gap-007-lr-ref.html": [
@@ -302991,6 +303329,10 @@
        []
       ]
      },
+     "table-item-flex-percentage-width-ref.html": [
+      "e598475fddf54274f93609de94b0f950618bc8e2",
+      []
+     ],
      "whitespace-in-flexitem-001-ref.html": [
       "f7ab7baf7c31949d68169f150526bb274007ddbb",
       []
@@ -314538,6 +314880,10 @@
        "17d69f306d77411f2ef0a7dab682b119c5b59e50",
        []
       ],
+      "first-line-with-inline-block-ref.html": [
+       "31717d4171bad4c98b272e4ce70ee6578780b10b",
+       []
+      ],
       "placeholder-excluded-properties-ref.html": [
        "0e573cb3d6cbac837c9e10552e360aa713fee60b",
        []
@@ -315805,6 +316151,10 @@
        ]
       },
       "support": {
+       "1x1-green.png": [
+        "b98ca0ba0a03c580ac339e4a3653539cfa8edc71",
+        []
+       ],
        "20x50-green.png": [
         "f7f6e67feee0079f21791cf050baffd87b67f8ab",
         []
@@ -319452,6 +319802,10 @@
        "d9811874eef87fe37bf5173c0dccc380907cf439",
        []
       ],
+      "text-decoration-color-selection-pseudo-01-ref.html": [
+       "516b0f83db27177fbc603fabccafbdc7e3211240",
+       []
+      ],
       "text-decoration-line-010-ref.xht": [
        "6bcba28f191d03b2106131f27c7a2f88667cc9ca",
        []
@@ -319704,6 +320058,14 @@
        "4b0b285a797479f5cf979b778d51456507c24cb5",
        []
       ],
+      "text-underline-offset-overline-ref.html": [
+       "6af24debf7dc463aeb7fc10fb4e3b9f6bffd437d",
+       []
+      ],
+      "text-underline-offset-overline-vertical-ref.html": [
+       "9f3ab30a734aa00977347f886431fae988f63fee",
+       []
+      ],
       "text-underline-offset-scroll-001-notref.html": [
        "c76a6a4945d0ad5324508cb372ba88fe52005fa9",
        []
@@ -319724,6 +320086,10 @@
        "438fb1432d25d184082f4d8c3033f8c6c2bce6f8",
        []
       ],
+      "text-underline-offset-vertical-003-ref.html": [
+       "5fcf8db7bc388624246ecd2f0fefb439a5e925ee",
+       []
+      ],
       "text-underline-position-001-ref.html": [
        "aae441ac4e02ddb6e44bfa9004ff33c376cb6548",
        []
@@ -319768,7 +320134,7 @@
       ],
       "support": {
        "transform-interpolation-reftests.js": [
-        "0094b8a2c7590151e551aa1fde5be67e82779b6a",
+        "ba071696be22eaf348eb4ccacec8638be048d85e",
         []
        ]
       },
@@ -331806,7 +332172,7 @@
       []
      ],
      "delete.js": [
-      "00b61178c74b1704cfe18c7b3f00e98937ae98b2",
+      "7fa2c4cfdfc46a7fc4e2f2294af3882cc7de3a68",
       []
      ],
      "fontname.js": [
@@ -331826,7 +332192,7 @@
       []
      ],
      "forwarddelete.js": [
-      "b636a95e8a0e84608620e72fb7279a62de677477",
+      "90310f8c2c8bc311ec799f1f36e8214773b99fe6",
       []
      ],
      "hilitecolor.js": [
@@ -368027,7 +368393,7 @@
      []
     ],
     "README.md": [
-     "823a8eec02228265dc94bc7c01ac87e99c22e06b",
+     "50a71bb482df9e21f6385973268f9e95b3464e7c",
      []
     ],
     "resources": {
@@ -368039,6 +368405,14 @@
       "f64531bc8bd5285ae9f2c35cd38f8a739ee39e72",
       []
      ],
+     "percent-encoding.json": [
+      "eccd1db62fe60131fb12cbdf8c16e0354bcf7a98",
+      []
+     ],
+     "percent-encoding.py": [
+      "f7228871205a20643787bd41df943154c3bd2e25",
+      []
+     ],
      "setters_tests.json": [
       "8aa74d6b8a28d9021050f4e52e7ee7f8f411912f",
       []
@@ -373734,7 +374108,7 @@
       []
      ],
      "get-set-cookie.py": [
-      "cdba642fca96f93a8d9d33a909682b4a1d2a7f04",
+      "234280d35300a80ba4511784ded79c4cc048a6eb",
       []
      ],
      "gzip.py": [
@@ -412198,7 +412572,7 @@
      "aspect-ratio": {
       "parsing": {
        "contain-intrinsic-size-computed.html": [
-        "6a1f08a8a205222100a06d2fc3ff918564a3140a",
+        "d98f6d1dcee3d7f06e11ba024c3f881d011b4495",
         [
          null,
          {}
@@ -412212,7 +412586,7 @@
         ]
        ],
        "contain-intrinsic-size-valid.html": [
-        "7860e7556eca33c3f043bb553cefb9f71ae1b506",
+        "e825b7cdb451f0d71efc0c78ae78ed3bad2d142d",
         [
          null,
          {}
@@ -412239,6 +412613,13 @@
         null,
         {}
        ]
+      ],
+      "replaced-element-028.html": [
+       "ece5efbc65d7d688c3e95db36f55b37654e84a7d",
+       [
+        null,
+        {}
+       ]
       ]
      },
      "aspect-ratio-affects-container-width-when-height-changes.html": [
@@ -421748,14 +422129,14 @@
       ]
      ],
      "ttwf-cssom-doc-ext-load-count.html": [
-      "5296aa3a8bcb6c48ddd5214b3e33e4e3c6703c20",
+      "5c2b9e6f46027d6d01a2a74fe00cd27b820189ec",
       [
        null,
        {}
       ]
      ],
      "ttwf-cssom-doc-ext-load-tree-order.html": [
-      "795ead02f4b2598d037c6d059f303f020c3d5d20",
+      "2824401cb252373e26eeb3eca1c5e1d6650576c2",
       [
        null,
        {}
@@ -423950,6 +424331,20 @@
         {}
        ]
       ],
+      "not-001.html": [
+       "db1cf291c7e07f42ba2e40f12ed2d470bfafaa65",
+       [
+        null,
+        {}
+       ]
+      ],
+      "not-002.html": [
+       "811b125f8c1f272221eec0c0e56e3fb4b8bcfbc6",
+       [
+        null,
+        {}
+       ]
+      ],
       "quirks-mode-stylesheet-dynamic-add-001.html": [
        "3d7be982378fe2414f818d1682eca8f38f3575ac",
        [
@@ -424056,6 +424451,20 @@
        {}
       ]
      ],
+     "not-complex.html": [
+      "8e092a4ec6cdec85dbe213baebbf3b199f4b39b2",
+      [
+       null,
+       {}
+      ]
+     ],
+     "not-specificity.html": [
+      "d9a2a4ddffad5de8c0896dc23d710f4eb9931ef1",
+      [
+       null,
+       {}
+      ]
+     ],
      "parsing": {
       "parse-attribute.html": [
        "a8fcfb24f5a9b1350adda6e59af814f1111325c1",
@@ -424100,7 +424509,7 @@
        ]
       ],
       "parse-not.html": [
-       "3895683d1c84c1a39a38f2976f7b672a2b06e121",
+       "e96db5a83ce021dde4a3b20de6a80374e7fd4914",
        [
         null,
         {}
@@ -424317,6 +424726,13 @@
       {}
      ]
     ],
+    "element-internals-shadowroot.html": [
+     "0afd43dd6371b6f2a649aa07c4a37b7203da3840",
+     [
+      null,
+      {}
+     ]
+    ],
     "enqueue-custom-element-callback-reactions-inside-another-callback.html": [
      "2fd932f29a3bae3e80ee90a1996c1d25ea7934cf",
      [
@@ -477310,7 +477726,7 @@
         ]
        ],
        "img-aspect-ratio.html": [
-        "eceef92a6418f3d74ffbd13a08d8e648dff42a3f",
+        "af4542e55fde52c4efd316795d1500b35099d3f6",
         [
          null,
          {}
@@ -503636,13 +504052,6 @@
        {}
       ]
      ],
-     "fcp-ensure-update-the-rendering-step.html": [
-      "700707de33a6ada29220d3c914000d1868edd36e",
-      [
-       null,
-       {}
-      ]
-     ],
      "fcp-gradient.html": [
       "c1e147472ff076cb2aa72b7dfc45cd6d3a00ed34",
       [
@@ -505987,6 +506396,15 @@
       }
      ]
     ],
+    "pointerevent_auxclick_is_a_pointerevent.html": [
+     "8c25125a4f0dee674a122cda94d23fab873c8a10",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "pointerevent_boundary_events_at_implicit_release_hoverable_pointers.html": [
      "066f3a7ea8922382246aebd4c6e5aa2f1b6ae7bd",
      [
@@ -506032,6 +506450,15 @@
       }
      ]
     ],
+    "pointerevent_click_is_a_pointerevent.html": [
+     "ba20919ebe061efedaf38896246fb7aecfecd811",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "pointerevent_coalesced_events_attributes.html": [
      "d30f71e940a5ebabb70f6309f663f25b2c5198b4",
      [
@@ -506048,6 +506475,15 @@
       {}
      ]
     ],
+    "pointerevent_contextmenu_is_a_pointerevent.html": [
+     "4f5b2434b40054913b094ed2fcb11d4a36390008",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "pointerevent_disabled_form_control.html": [
      "13f6e31cb41c5fe6cdb8eee6928174debe06a5ed",
      [
@@ -519280,6 +519716,13 @@
        {}
       ]
      ],
+     "animation-timeline-multiple.html": [
+      "61cfce9cb15f7be0ce392cc5c62e48360d0978a0",
+      [
+       null,
+       {}
+      ]
+     ],
      "animation-timeline-none.html": [
       "d5d585366c9e3c451f9d19f0c573798d1413644e",
       [
@@ -519322,6 +519765,13 @@
        {}
       ]
      ],
+     "at-scroll-timeline-ignored.tentative.html": [
+      "1ea61f44e3fdffe064a02b21bfcab36f911a2747",
+      [
+       null,
+       {}
+      ]
+     ],
      "at-scroll-timeline-inactive-phase.html": [
       "a8db8e63238bc3f547094733e302a659646eefde",
       [
@@ -522487,21 +522937,14 @@
       ]
      ],
      "declarative-shadow-dom-attachment.tentative.html": [
-      "1e1ac7a0561f639bce325224ab512233f32cf0ba",
+      "b78902c4b59dc26ac819fbe24809621201fdc0ca",
       [
        null,
        {}
       ]
      ],
      "declarative-shadow-dom-basic.tentative.html": [
-      "a72cf70ef6679ed9281129436ad7063b7c5227c5",
-      [
-       null,
-       {}
-      ]
-     ],
-     "element-internals-shadowroot.tentative.html": [
-      "aeaa322a31c220d01a19c9a35c01f3537af9d4e6",
+      "92e667fdbcf9c3828e97732795af9d682c59645b",
       [
        null,
        {}
@@ -535240,6 +535683,13 @@
       }
      ]
     ],
+    "percent-encoding.window.js": [
+     "dcb5c1e55b21b7830fe79f61f071c33b97bb986a",
+     [
+      "url/percent-encoding.window.html",
+      {}
+     ]
+    ],
     "toascii.window.js": [
      "cdc488ec28526f530031b66b63b3c23ff7dad430",
      [
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-004.html.ini
similarity index 67%
rename from tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
rename to tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
index f29da48a2a0..4bfb0c2053a 100644
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -1,4 +1,4 @@
-[hit-test-floats-003.html]
+[hit-test-floats-004.html]
   [Miss float below something else]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-flexbox/table-item-flex-percentage-width.html.ini b/tests/wpt/metadata/css/css-flexbox/table-item-flex-percentage-width.html.ini
new file mode 100644
index 00000000000..a0f901c6558
--- /dev/null
+++ b/tests/wpt/metadata/css/css-flexbox/table-item-flex-percentage-width.html.ini
@@ -0,0 +1,2 @@
+[table-item-flex-percentage-width.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini b/tests/wpt/metadata/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini
new file mode 100644
index 00000000000..37be1af1eeb
--- /dev/null
+++ b/tests/wpt/metadata/css/css-transforms/animation/transform-interpolation-rotate-slerp.html.ini
@@ -0,0 +1,2 @@
+[transform-interpolation-rotate-slerp.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
index f8e7e539aae..4a1e8110f6f 100644
--- a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
new file mode 100644
index 00000000000..4c79907309b
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
@@ -0,0 +1,4 @@
+[CaretPosition-001.html]
+  [Element at (400, 100)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
deleted file mode 100644
index e181af5397f..00000000000
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[elementsFromPoint-invalid-cases.html]
-  [The root element is the last element returned for otherwise empty queries within the viewport]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini
deleted file mode 100644
index 239c35135e4..00000000000
--- a/tests/wpt/metadata/css/cssom-view/offsetTopLeft-border-box.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[offsetTopLeft-border-box.html]
-  [container: 1]
-    expected: FAIL
-
-  [container: 0]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini b/tests/wpt/metadata/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini
deleted file mode 100644
index 726fbdead61..00000000000
--- a/tests/wpt/metadata/css/cssom/ttwf-cssom-doc-ext-load-count.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[ttwf-cssom-doc-ext-load-count.html]
-  type: testharness
-  [stylesheet-1.css should be loaded and styleSheets.length === 1]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/selectors/invalidation/not-001.html.ini b/tests/wpt/metadata/css/selectors/invalidation/not-001.html.ini
new file mode 100644
index 00000000000..99d21825015
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/invalidation/not-001.html.ini
@@ -0,0 +1,7 @@
+[not-001.html]
+  [precondition]
+    expected: FAIL
+
+  [Invalidation of sibling combinators in :not()]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/invalidation/not-002.html.ini b/tests/wpt/metadata/css/selectors/invalidation/not-002.html.ini
new file mode 100644
index 00000000000..9eaa0b2b190
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/invalidation/not-002.html.ini
@@ -0,0 +1,19 @@
+[not-002.html]
+  [Invalidate :not() for simple selector arguments.]
+    expected: FAIL
+
+  [Invalidate :not() for compound selector arguments.]
+    expected: FAIL
+
+  [Test specificity of :not().]
+    expected: FAIL
+
+  [Preconditions.]
+    expected: FAIL
+
+  [Invalidate :not() for complex selector arguments.]
+    expected: FAIL
+
+  [Invalidate nested :is() inside :not().]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/is-default-ns-002.html.ini b/tests/wpt/metadata/css/selectors/is-default-ns-002.html.ini
new file mode 100644
index 00000000000..b8de9607a92
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/is-default-ns-002.html.ini
@@ -0,0 +1,2 @@
+[is-default-ns-002.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/selectors/not-complex.html.ini b/tests/wpt/metadata/css/selectors/not-complex.html.ini
new file mode 100644
index 00000000000..3ada8da5b89
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/not-complex.html.ini
@@ -0,0 +1,2 @@
+[not-complex.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/css/selectors/not-default-ns-001.html.ini b/tests/wpt/metadata/css/selectors/not-default-ns-001.html.ini
new file mode 100644
index 00000000000..2e7e90b9ee0
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/not-default-ns-001.html.ini
@@ -0,0 +1,2 @@
+[not-default-ns-001.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata/css/selectors/not-specificity.html.ini b/tests/wpt/metadata/css/selectors/not-specificity.html.ini
new file mode 100644
index 00000000000..f4dad41b375
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/not-specificity.html.ini
@@ -0,0 +1,25 @@
+[not-specificity.html]
+  [:not(span, :not(:not(.a#foo)), p) wins over :not(span, #foo, p)]
+    expected: FAIL
+
+  [:not(div#foo) wins over :not(#foo)]
+    expected: FAIL
+
+  [:not(span, li, p) wins over :not(span, lo, p)]
+    expected: FAIL
+
+  [:not(#foo) wins over :not(.foo)]
+    expected: FAIL
+
+  [:not(span + span) wins over :not(span)]
+    expected: FAIL
+
+  [:not(.bar, #foo) has same specificity as :not(#foo, .bar)]
+    expected: FAIL
+
+  [:not(.bar, #foo) wins over :not(.foo, .bar)]
+    expected: FAIL
+
+  [:not(span, #foo, p) wins over :not(span, :where(.a#foo), p)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/selectors/parsing/parse-not.html.ini b/tests/wpt/metadata/css/selectors/parsing/parse-not.html.ini
new file mode 100644
index 00000000000..c52f597e5fc
--- /dev/null
+++ b/tests/wpt/metadata/css/selectors/parsing/parse-not.html.ini
@@ -0,0 +1,25 @@
+[parse-not.html]
+  [":not(span.a, div.b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(:not(foo))" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b ~ c)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a .b ~ c, .d .e)" should be a valid selector]
+    expected: FAIL
+
+  [":not(.a + .b)" should be a valid selector]
+    expected: FAIL
+
+  [":not(:host(:not(.a)))" should be a valid selector]
+    expected: FAIL
+
+  [":not(:host)" should be a valid selector]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/custom-elements/element-internals-shadowroot.html.ini b/tests/wpt/metadata/custom-elements/element-internals-shadowroot.html.ini
new file mode 100644
index 00000000000..c485c2d79ab
--- /dev/null
+++ b/tests/wpt/metadata/custom-elements/element-internals-shadowroot.html.ini
@@ -0,0 +1,2 @@
+[element-internals-shadowroot.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index f5f10ba0299..c11f75a43eb 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -315,21 +315,18 @@
   [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: combined response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+  [<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]
+  [<iframe>: separate response Content-Type: text/html */*]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 646a46c0cbb..d2df9b78483 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,9 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript;charset=windows-1252 error text/javascript]
-    expected: FAIL
-
-  [separate text/javascript error]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
deleted file mode 100644
index 385376c7321..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_4.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
index fd369192a02..442db3cb549 100644
--- a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,5 +1,4 @@
 [embedded-opener-remove-frame.html]
-  expected: TIMEOUT
   [opener and "removed" embedded documents]
     expected: FAIL
 
@@ -7,5 +6,5 @@
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
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 cb0211f1d21..f6a7aca3306 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 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index 4bc0524f105..3f7e3e9544f 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     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 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/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
new file mode 100644
index 00000000000..a9677391662
--- /dev/null
+++ b/tests/wpt/metadata/html/syntax/parsing/DOMContentLoaded-defer.html.ini
@@ -0,0 +1,4 @@
+[DOMContentLoaded-defer.html]
+  [The end: DOMContentLoaded and defer scripts]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
deleted file mode 100644
index fca4d908c89..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[module-static-import-delayed.html]
-  [document.write in an imported module]
-    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..5ddb9bfeff6 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
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/url/percent-encoding.window.js.ini b/tests/wpt/metadata/url/percent-encoding.window.js.ini
new file mode 100644
index 00000000000..7c7f82336bf
--- /dev/null
+++ b/tests/wpt/metadata/url/percent-encoding.window.js.ini
@@ -0,0 +1,22 @@
+[percent-encoding.window.html]
+  [Input † with encoding windows-1252]
+    expected: FAIL
+
+  [Input − with encoding shift_jis]
+    expected: FAIL
+
+  [Input \x0eA with encoding iso-2022-jp]
+    expected: FAIL
+
+  [Input  with encoding gb18030]
+    expected: FAIL
+
+  [Input † with encoding big5]
+    expected: FAIL
+
+  [Input † with encoding euc-kr]
+    expected: FAIL
+
+  [Input ‾\\ with encoding iso-2022-jp]
+    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/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 1fbde1c0140..5f9efea2abe 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
@@ -464,3 +464,9 @@
   [X SNR (-384.8648378962337 dB) is not greater than or equal to 65.737. Got -384.8648378962337.]
     expected: FAIL
 
+  [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[28696\]\t6.5015347726526008e+23\t9.3139332532882690e-1\t6.5015347726526008e+23\t6.9804395155583112e+23\t3.8985999999999999e-3\n\t[28697\]\t7.0477002859115601e-1\t9.0675884485244751e-1\t2.0198881626129150e-1\t2.2275913536212616e-1\t3.8985999999999999e-3\n\tMax AbsError of 6.5015347726526008e+23 at index of 28696.\n\tMax RelError of 6.9804395155583112e+23 at index of 28696.\n]
+    expected: FAIL
+
+  [X SNR (-432.82623184916594 dB) is not greater than or equal to 65.737. Got -432.82623184916594.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
index f1281b5ae81..b7e13cf7726 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiocontext-interface/audiocontext-not-fully-active.html.ini
@@ -1,5 +1,4 @@
 [audiocontext-not-fully-active.html]
-  expected: TIMEOUT
   [frame in navigated remote-site frame]
     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/018.html.ini b/tests/wpt/metadata/webmessaging/with-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata/webmessaging/without-ports/018.html.ini
rename to tests/wpt/metadata/webmessaging/with-ports/018.html.ini
diff --git a/tests/wpt/web-platform-tests/beacon/resources/content-type-and-body.py b/tests/wpt/web-platform-tests/beacon/resources/content-type-and-body.py
index 1c8c4c7ec16..9b1e880c2fa 100644
--- a/tests/wpt/web-platform-tests/beacon/resources/content-type-and-body.py
+++ b/tests/wpt/web-platform-tests/beacon/resources/content-type-and-body.py
@@ -2,7 +2,7 @@ def main(request, response):
     command = request.GET.first(b"cmd").lower()
     test_id = request.GET.first(b"id")
     if command == b"put":
-        request.server.stash.put(test_id, request.headers.get(b"Content-Type", b"") + ": " + request.body)
+        request.server.stash.put(test_id, request.headers.get(b"Content-Type", b"") + b": " + request.body)
         return [(b"Content-Type", b"text/plain")], u""
 
     if command == b"get":
diff --git a/tests/wpt/web-platform-tests/css/css-contain/contain-size-replaced-007.html b/tests/wpt/web-platform-tests/css/css-contain/contain-size-replaced-007.html
new file mode 100644
index 00000000000..6a17057bdd5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-contain/contain-size-replaced-007.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Containment Test: Size containment replaced elements intrinsic size</title>
+<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-size">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#attributes-for-embedded-content-and-images">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name=assert content="This test checks that an aspect ratio computed from width and height attributes is used even with contain: size.">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<img src="support/60x60-green.png" width="60" height="60" style="width: 100px; height: auto; contain: size;">
diff --git a/tests/wpt/web-platform-tests/css/css-contain/content-visibility/content-visibility-form-controls-crash.html b/tests/wpt/web-platform-tests/css/css-contain/content-visibility/content-visibility-form-controls-crash.html
new file mode 100644
index 00000000000..6c9634dc1f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-contain/content-visibility/content-visibility-form-controls-crash.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<link rel="help" href="https://crbug.com/1143620">
+<style>
+input, select, textarea {
+  content-visibility: auto;
+}
+</style>
+<input type="button">
+<input type="checkbox">
+<input type="color">
+<input type="date">
+<input type="datetime">
+<input type="datetime-local">
+<input type="email">
+<input type="file">
+<input type="hidden">
+<input type="image">
+<input type="month">
+<input type="number">
+<input type="password">
+<input type="radio">
+<input type="range">
+<input type="reset">
+<input type="search">
+<input type="submit">
+<input type="tel">
+<input type="text">
+<input type="time">
+<input type="url">
+<input type="week">
+<select><option>Option1</option></select>
+<select multiple><option>Option1</option></select>
+<textarea></textarea>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-nested.html b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-nested.html
new file mode 100644
index 00000000000..803b31410db
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-nested.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#baseline-participation">
+<link rel="match" href="dynamic-baseline-change-ref.html">
+<meta name="assert" content="This test ensures proper baseline alignment for a sub-tree which adds a scrollbar.">
+<div style="display: flex; width: 100px; border: solid; align-items: baseline;">
+  <div style="width: 50px; height: 50px;">
+    <div style="width: 50px; height: 50px; position: relative; overflow: auto;">
+      <canvas width=10 height=10 style="width: 80%; background: green;"></canvas> <!-- Baseline of the canvas will move when a scrollbar is added. -->
+      <div id="target" style="position: absolute; width: 10px; height: 10px; background: red; top: 0;"></div>
+    </div>
+  </div>
+  <div style="width: 50px; height: 50px; background: green;"></div> <!-- Baseline is synthesized at the block-end edge. -->
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.top = '100px';
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-ref.html
new file mode 100644
index 00000000000..af030931dda
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change-ref.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<div style="display: flex; width: 100px; border: solid; align-items: baseline;">
+  <div style="width: 50px; height: 50px;">
+    <div style="width: 50px; height: 50px; position: relative; overflow: auto;">
+      <canvas width=10 height=10 style="width: 80%; background: green;"></canvas>
+      <div id="target" style="position: absolute; width: 10px; height: 10px; background: red; top: 100px;"></div>
+    </div>
+  </div>
+  <div style="width: 50px; height: 50px; background: green;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change.html b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change.html
new file mode 100644
index 00000000000..f13b87f0c14
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/dynamic-baseline-change.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#baseline-participation">
+<link rel="match" href="dynamic-baseline-change-ref.html">
+<meta name="assert" content="This test ensures proper baseline alignment for a sub-tree which adds a scrollbar.">
+<div style="display: flex; width: 100px; border: solid; align-items: baseline;">
+  <div style="width: 50px; height: 50px; position: relative; overflow: auto;">
+    <canvas width=10 height=10 style="width: 80%; background: green;"></canvas> <!-- Baseline of the canvas will move when a scrollbar is added. -->
+    <div id="target" style="position: absolute; width: 10px; height: 10px; background: red; top: 0;"></div>
+  </div>
+  <div style="width: 50px; height: 50px; background: green;"></div> <!-- Baseline is synthesized at the block-end edge. -->
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.top = '100px';
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr-ref.html
index d840f47e57c..0de73376ee9 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr-ref.html
@@ -17,8 +17,18 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
   }
-  section > div:not(:last-of-type) {
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
+  }
+  #bp, #ww {
     margin-inline-end: 20px;
     margin-block-end: 20px;
   }
@@ -26,9 +36,9 @@
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr.html
index 93dd65ad467..ae4101cecfa 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-lr.html
@@ -24,14 +24,24 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
+  }
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
   }
 </style>
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr-ref.html
index 893acc50bd1..65d9eaf32f1 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr-ref.html
@@ -13,8 +13,18 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
   }
-  section > div:not(:last-of-type) {
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
+  }
+  #bp, #ww {
     margin-inline-end: 20px;
     margin-block-end: 20px;
   }
@@ -22,9 +32,9 @@
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr.html
index e5124806ea5..705d98cbf52 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-ltr.html
@@ -20,14 +20,24 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
+  }
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
   }
 </style>
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl-ref.html
index 0679fadba94..9b64f122f6f 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl-ref.html
@@ -17,8 +17,18 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
   }
-  section > div:not(:last-of-type) {
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
+  }
+  #bp, #ww {
     margin-inline-end: 20px;
     margin-block-end: 20px;
   }
@@ -26,9 +36,9 @@
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl.html
index ed6d02ec0cc..e37baec59be 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rl.html
@@ -24,14 +24,24 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
+  }
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
   }
 </style>
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl-ref.html
index 3eeec3d0ae4..3f64a75269d 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl-ref.html
@@ -17,8 +17,18 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
   }
-  section > div:not(:last-of-type) {
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
+  }
+  #bp, #ww {
     margin-inline-end: 20px;
     margin-block-end: 20px;
   }
@@ -26,9 +36,9 @@
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl.html
index ebbb60a18c0..eb52910dc0b 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-006-rtl.html
@@ -24,14 +24,24 @@
   section > div{
     background-color: grey;
     color: white;
+    block-size: 20px;
+  }
+  #bp {
+    inline-size: 120px;
+  }
+  #ww {
+    inline-size: 130px;
+  }
+  #s, #f {
+    inline-size: 40px;
   }
 </style>
 <body>
   <p>Test passes if there are <strong> green lines between boxes</strong>.</p>
   <section>
-    <div>Black Panther</div>
-    <div>Wonder Woman</div>
-    <div>Storm</div>
-    <div>Flash</div>
+    <div id=bp>Black Panther</div>
+    <div id=ww>Wonder Woman</div>
+    <div id=s>Storm</div>
+    <div id=f>Flash</div>
   </section>
 </body>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width-ref.html
new file mode 100644
index 00000000000..e598475fddf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width-ref.html
@@ -0,0 +1,140 @@
+<!doctype html>
+<title>Reference: display:table flex items with flex-shrink/flex-grow/flex-basis</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1673006">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+  html,body {
+    color:black; background-color:white; font:20px/1 Ahem; padding:0; margin:0;
+  }
+
+  .container {
+    display: flex;
+    width: 180px;
+    border: 1px solid blue;
+  }
+
+  .container > * {
+    background-color: cyan;
+    display: block;
+  }
+  .test1 > * {
+    flex-shrink: 0;
+    width: 100%;
+  }
+  .test2 > * {
+    flex-shrink: 0;
+    width: 50%;
+  }
+  .test3 > * {
+    flex-shrink: 0.5;
+    width: 50%;
+  }
+  .test4 > * {
+    flex-grow: 0.1;
+    width: 50%;
+  }
+  .test5 > * {
+    flex-shrink: 0.2;
+    flex-grow: 0.5;
+    width: 10%;
+  }
+  .base > * {
+    flex-basis: 100px;
+  }
+  .large-base {
+    width: 100px;
+  }
+  .large-base > * {
+    flex-basis: 200px;
+  }
+</style>
+
+<div class="container test1">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test1 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test1 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width.html b/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width.html
new file mode 100644
index 00000000000..f21b5f0c656
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/table-item-flex-percentage-width.html
@@ -0,0 +1,144 @@
+<!doctype html>
+<title>Flexbox Test: display:table flex items with flex-shrink/flex-grow/flex-basis</title>
+<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1673006">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-property">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1673006">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1454330">
+<link rel="match" href="table-item-flex-percentage-width-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+  html,body {
+    color:black; background-color:white; font:20px/1 Ahem; padding:0; margin:0;
+  }
+
+  .container {
+    display: flex;
+    width: 180px;
+    border: 1px solid blue;
+  }
+
+  .container > * {
+    background-color: cyan;
+    display: table;
+  }
+  .test1 > * {
+    flex-shrink: 0;
+    width: 100%;
+  }
+  .test2 > * {
+    flex-shrink: 0;
+    width: 50%;
+  }
+  .test3 > * {
+    flex-shrink: 0.5;
+    width: 50%;
+  }
+  .test4 > * {
+    flex-grow: 0.1;
+    width: 50%;
+  }
+  .test5 > * {
+    flex-shrink: 0.2;
+    flex-grow: 0.5;
+    width: 10%;
+  }
+  .base > * {
+    flex-basis: 100px;
+  }
+  .large-base {
+    width: 100px;
+  }
+  .large-base > * {
+    flex-basis: 200px;
+  }
+</style>
+
+<div class="container test1">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test1 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5 base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test1 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test2 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test3 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test4 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
+
+<div class="container test5 large-base">
+  <div>1</div>
+  <div>2</div>
+  <div>3</div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.tentative.html b/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.html
similarity index 73%
rename from tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.tentative.html
rename to tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.html
index 1baf1d7827d..13af3f0e9f7 100644
--- a/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-001.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/1432">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4659">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#abspos-sizing">
 <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="The available space for a box with center alignment is double the distance between the center of the static position rectangle and the closest edge of the containing block in the relevant axis.">
 <style>
 #containing-block {
   position: relative;
diff --git a/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.tentative.html b/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.html
similarity index 74%
rename from tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.tentative.html
rename to tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.html
index 2de625f3925..825143521a2 100644
--- a/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-position/position-absolute-center-002.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/1432">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4659">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#abspos-sizing">
 <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="The available space for a box with center alignment is double the distance between the center of the static position rectangle and the closest edge of the containing block in the relevant axis.">
 <style>
 #containing-block {
   position: relative;
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/first-line-with-inline-block.html b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-with-inline-block.html
new file mode 100644
index 00000000000..12e11a3d2e4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/first-line-with-inline-block.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#first-text-line">
+<link rel="match" href="reference/first-line-with-inline-block-ref.html">
+<style>
+.fl:first-line {
+  color: red;
+}
+.fl-atomic {
+  display: inline-block;
+}
+.fl-atomic:first-line {
+  color: lime;
+}
+</style>
+<div class="fl">
+FIRST <div class="fl-atomic">first</span><br>second</div> FIRST
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/reference/first-line-with-inline-block-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/reference/first-line-with-inline-block-ref.html
new file mode 100644
index 00000000000..31717d4171b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/reference/first-line-with-inline-block-ref.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<style>
+.outer-f {
+  color: red;
+}
+.fl-atomic {
+  display: inline-block;
+}
+.inner-f {
+  color: lime;
+}
+</style>
+<div>
+<span class="outer-f">FIRST</span> <div class="fl-atomic"><span class="inner-f">first</span><br>second</div> <span class="outer-f">FIRST</span>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
index 6a1f08a8a20..d98f6d1dcee 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
@@ -14,14 +14,14 @@
 test_computed_value("aspect-ratio", "auto");
 test_computed_value("aspect-ratio", "1", "1 / 1");
 test_computed_value("aspect-ratio", "1.3", "1.3 / 1");
-test_computed_value("aspect-ratio", "1 / 1");
+test_computed_value("aspect-ratio", "1 / 1", "1 / 1");
 test_computed_value("aspect-ratio", "16 / 9");
 test_computed_value("aspect-ratio", "16.3 / 9.5");
 test_computed_value("aspect-ratio", "16/9", "16 / 9");
 test_computed_value("aspect-ratio", "0 / 9");
 test_computed_value("aspect-ratio", "16 / 0");
 test_computed_value("aspect-ratio", "auto 1", "auto 1 / 1");
-test_computed_value("aspect-ratio", "auto 1 / 1");
+test_computed_value("aspect-ratio", "auto 1 / 1", "auto 1 / 1");
 test_computed_value("aspect-ratio", "0 auto", "auto 0 / 1");
 test_computed_value("aspect-ratio", "0 / 0");
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
index 7860e7556ec..e825b7cdb45 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
@@ -11,7 +11,7 @@
 test_valid_value("aspect-ratio", "auto");
 test_valid_value("aspect-ratio", "16", "16 / 1");
 test_valid_value("aspect-ratio", "1/1", "1 / 1");
-test_valid_value("aspect-ratio", "16.3", "16.3 / 1");
+test_valid_value("aspect-ratio", "16.3 / 1", "16.3 / 1");
 test_valid_value("aspect-ratio", "16 / 9");
 test_valid_value("aspect-ratio", "16.3 / 9.4");
 test_valid_value("aspect-ratio", "16/9", "16 / 9");
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-028.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-028.html
new file mode 100644
index 00000000000..ece5efbc65d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-028.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: img</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id="log"></div>
+
+<img id="test" src="error.png" style="width: 100px; aspect-ratio: 1/5; background: yellow;" alt="Should not be 500px high">
+
+<script>
+function run_test() {
+  test(function() {
+    var img = document.getElementById("test");
+    assert_not_equals(img.offsetHeight, 500);
+  });
+}
+onload = run_test;
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/support/1x1-green.png b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/support/1x1-green.png
new file mode 100644
index 00000000000..b98ca0ba0a0
Binary files /dev/null and b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/support/1x1-green.png differ
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-001.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-001.html
new file mode 100644
index 00000000000..d2ed6cfb234
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-001.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: zero aspect-ratio</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; width: 100px; aspect-ratio: 0/1;"></div>
+<div style="background: green; width: 100px; height: 100px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-002.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-002.html
new file mode 100644
index 00000000000..28470dd8756
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-002.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: zero aspect-ratio</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: 100px;">
+  <div style="background: green; height: 100px; aspect-ratio: 0/1;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-003.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-003.html
new file mode 100644
index 00000000000..ad0c3bf176b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-003.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: infinite aspect-ratio</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; width: 100px; aspect-ratio: 1/0;"></div>
+<div style="background: green; width: 100px; height: 100px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-004.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-004.html
new file mode 100644
index 00000000000..58db88c3bc1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-004.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: infinite aspect-ratio</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: 100px;">
+  <div style="background: green; height: 100px; aspect-ratio: 1/0;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-005.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-005.html
new file mode 100644
index 00000000000..2892028f940
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-005.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: 0/0 aspect-ratio (behaves as infinity)</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- "aspect-ratio: 0/0" behaves as "aspect-ratio: 1/0"-->
+<div style="background: green; width: 100px; aspect-ratio: 0/0;"></div>
+<div style="background: green; width: 100px; height: 100px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-006.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-006.html
new file mode 100644
index 00000000000..f34aa6c126c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-006.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: zero aspect-ratio img</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<img src="support/1x1-green.png" style="width: 100px; aspect-ratio: 0/1;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-007.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-007.html
new file mode 100644
index 00000000000..97e602612f4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-007.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: zero aspect-ratio img</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<img src="support/1x1-green.png" style="height: 100px; aspect-ratio: 0/1;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-008.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-008.html
new file mode 100644
index 00000000000..644090aa3ce
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-008.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: infinite aspect-ratio img</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<img src="support/1x1-green.png" style="width: 100px; aspect-ratio: 1/0;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-009.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-009.html
new file mode 100644
index 00000000000..6e320cf5410
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-009.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: infinite aspect-ratio img</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<img src="support/1x1-green.png" style="height: 100px; aspect-ratio: 1/0;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-010.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-010.html
new file mode 100644
index 00000000000..92b4750157d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/zero-or-infinity-010.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: 0/0 aspect-ratio img</title>
+<link rel="author" title="mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4572">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<img src="support/1x1-green.png" style="width: 100px; aspect-ratio: 0/0;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-decoration-color-selection-pseudo-01-ref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-decoration-color-selection-pseudo-01-ref.html
new file mode 100644
index 00000000000..516b0f83db2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-decoration-color-selection-pseudo-01-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Test: CSS3 text-decoration-color when |::selection| and another pseudo style exists, reference</title>
+<link rel="author" title="Stephen Chenney" href="mailto:schenney@chromium.org">
+<style>
+    p::first-line {
+        text-decoration: underline;
+        color: green;
+	}
+</style>
+</head>
+<body>
+    <p>
+      Underlined, and green when selected.
+    </p>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-ref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-ref.html
new file mode 100644
index 00000000000..6af24debf7d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Reference result for text-underline-offset test</title>
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        #main {
+            margin: 30px;
+        }
+        #main div {
+            text-decoration: green overline;
+            text-decoration-thickness: 5px;
+            text-decoration-skip-ink: none;
+            font: 20px/1 Ahem;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the green overline is not shifted away from black box.</p>
+    <div id="main">
+        <div>XXXX</div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-vertical-ref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-vertical-ref.html
new file mode 100644
index 00000000000..9f3ab30a734
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-overline-vertical-ref.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Reference case for overline placement in vertical</title>
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        #main {
+            margin: 30px;
+        }
+        #main div {
+            writing-mode: vertical-lr;
+            text-decoration: green overline;
+            text-decoration-thickness: 5px;
+            text-decoration-skip-ink: none;
+            font: 20px/1 Ahem;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the green overline is not shifted away from black box.</p>
+    <div id="main">
+        <div>XXXX</div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-vertical-003-ref.html b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-vertical-003-ref.html
new file mode 100644
index 00000000000..5fcf8db7bc3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/reference/text-underline-offset-vertical-003-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Reference case for text-underline-offset</title>
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        span{
+            margin-left: 5em;
+            font: 20px/1 Ahem;
+            color: transparent;
+            writing-mode: vertical-lr;
+            text-decoration: green underline;
+            text-decoration-skip-ink: none;
+            text-underline-offset: 0;
+            text-underline-position: right;
+        }
+    </style>
+</head>
+<body>
+    <div>Test passes if the underline is vertical and at about a 5em margin from the left side.</div>
+    <div><span>XXXXX</span></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-color-selection-pseudo-01.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-color-selection-pseudo-01.html
new file mode 100644
index 00000000000..0df1d477ef7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-color-selection-pseudo-01.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Test: CSS3 text-decoration-color when |::selection| and another pseudo style exists</title>
+<meta name="assert" content="When selected, text decorations apply the selection color when other pseudo styles are present">
+<link rel="author" title="Stephen Chenney" href="mailto:schenney@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-text-decor-3/#text-decoration-color-property">
+<link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#highlight-styling">
+<link rel="match" href="reference/text-decoration-color-selection-pseudo-01-ref.html">
+<style>
+    p::first-line {
+        text-decoration: underline;
+	}
+    p::selection {
+        color: green;
+    }
+</style>
+</head>
+<body>
+    <p>
+      Underlined, and green when selected.
+    </p>
+    <script>
+      document.execCommand("SelectAll")
+    </script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline-vertical.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline-vertical.html
new file mode 100644
index 00000000000..b95afc2c1d8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline-vertical.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>text-underline-offset does not affect overline placement in vertical text</title>
+    <meta name="assert" content="text-underline offset does not affect placement of an overline decoration in vertical">
+    <link rel="author" title="Dominik Röttsches" href="mailto:drott@chromium.org">
+    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#underline-offset">
+    <link rel="match" href="reference/text-underline-offset-overline-vertical-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        #main {
+            margin: 30px;
+        }
+        #main div {
+            writing-mode: vertical-lr;
+            text-decoration: green overline;
+            text-decoration-thickness: 5px;
+            text-decoration-skip-ink: none;
+            font: 20px/1 Ahem;
+            text-underline-offset: 20px;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the green overline is not shifted away from black box.</p>
+    <div id="main">
+        <div>XXXX</div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline.html
new file mode 100644
index 00000000000..cca8c1c110f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-overline.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>text-underline-offset does not affect overline placement</title>
+    <meta name="assert" content="text-underline offset does not affect placement of an overline decoration">
+    <link rel="author" title="Dominik Röttsches" href="mailto:drott@chromium.org">
+    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#underline-offset">
+    <link rel="match" href="reference/text-underline-offset-overline-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        #main {
+            margin: 30px;
+        }
+        #main div {
+            text-decoration: green overline;
+            text-decoration-thickness: 5px;
+            text-decoration-skip-ink: none;
+            font: 20px/1 Ahem;
+            text-underline-offset: 20px;
+        }
+    </style>
+</head>
+<body>
+    <p class="instructions">Test passes if the green overline is not shifted away from black box.</p>
+    <div id="main">
+        <div>XXXX</div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-vertical-003.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-vertical-003.html
new file mode 100644
index 00000000000..0addc49e50e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text-decor/text-underline-offset-vertical-003.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Test case for text-underline-offset</title>
+    <meta name="assert" content="text-underline-offset should work when the underline is on the right side">
+    <link rel="author" title="Dominik Röttsches" href="mailto:drott@chromium.org">
+    <link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#underline-offset">
+    <link rel="match" href="reference/text-underline-offset-vertical-003-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+        span{
+            font: 20px/1 Ahem;
+            color: transparent;
+            writing-mode: vertical-lr;
+            text-decoration: green underline;
+            text-decoration-skip-ink: none;
+            text-underline-offset: 5em;
+            text-underline-position: right;
+        }
+    </style>
+</head>
+<body>
+    <div>Test passes if the underline is vertical and at about a 5em margin from the left side.</div>
+    <div><span>XXXXX</span></div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/animation/support/transform-interpolation-reftests.js b/tests/wpt/web-platform-tests/css/css-transforms/animation/support/transform-interpolation-reftests.js
index 0094b8a2c75..ba071696be2 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/animation/support/transform-interpolation-reftests.js
+++ b/tests/wpt/web-platform-tests/css/css-transforms/animation/support/transform-interpolation-reftests.js
@@ -18,13 +18,43 @@ const transformTests = {
     ['translateX(50%)', 'translateX(calc(25% - 2em))', 'translateX(-4em)']
   ],
   rotate: [
-    ['rotate(0deg)', 'rotate(45deg)', 'rotate(90deg)'],
-    ['rotateX(0deg)', 'rotateX(45deg)', 'rotateX(90deg)'],
-    ['rotateY(0deg)', 'rotateY(45deg)', 'rotateY(90deg)'],
+    // Rotation about named-axis.
+    ['rotate(30deg)', 'rotate(60deg)', 'rotate(90deg)'],
+    ['rotateX(30deg)', 'rotateX(60deg)', 'rotateX(90deg)'],
+    ['rotateY(30deg)', 'rotateY(60deg)', 'rotateY(90deg)'],
+    ['rotate(30deg)', 'rotate(60deg)', 'rotateZ(90deg)'],
     ['rotate(0deg)', 'rotate(180deg)', 'rotate(360deg)'],
+    // Common axis rotations.
     ['rotate3d(7, 8, 9, 0deg)', 'rotate3d(7, 8, 9, 45deg)', 'rotate3d(7, 8, 9, 90deg)'],
+    ['rotate3d(1, 2, 3, 0deg)', 'rotate3d(3, 6, 9, 45deg)', 'rotate3d(2, 4, 6, 90deg)'],
+    // Axis is arbitrary if angle is zero. Use non-zero rotation to determine
+    // the rotation axis.
+    ['rotateX(0deg)', 'rotate(45deg)', 'rotate(90deg)'],
+    ['rotateX(90deg)', 'rotateX(45deg)', 'rotate(0deg)']
+  ],
+  rotateSlerp: [
     // First endpoint is the same rotation as rotateZ(0deg) but triggers SLERP
-    ['rotateX(360deg)', 'rotateZ(45deg)', 'rotateZ(90deg)']
+    ['rotateX(360deg)', 'rotateZ(45deg)', 'rotateZ(90deg)'],
+    // Interpolation with inverse. Second case is a common-axis case, but
+    // included here to group it with its equivalent SLERP test.
+    ['rotate(45deg)', 'rotate(0deg)', 'rotate3d(0, 0, -1, 45deg)'],
+    ['rotate(45deg)', 'rotate(0deg)', 'rotate(-45deg)'],
+    // Interpolate axis and angle of rotation.
+    // 70.5288deg = acos(1/3).
+    ['rotateX(90deg)', 'rotate3d(1, 1, 0, 70.5288deg)', 'rotateY(90deg)'],
+    // Not nice analytical solution for this last one.
+    // (1, 1, 0, 90deg) --> (x, y, z, w) = (1/2, 1/2, 0, 1/root2)
+    // (0, 1, 1, 180deg) --> (x, y, z, w) = (0, 1/root2, 1/root2, 0)
+    // Trace of the "to" transformation matrix is -1. Requires special handling
+    // to ensure correctness of the quaternion.
+    // SLERP @0.5: (x, y, z, w) = (0.30389062997686395,
+    //                             0.7336568918027127,
+    //                             0.4297662618258487,
+    //                             0.4297662618258487)
+    // --> rotate3d(0.3365568, 0.8125199, 0.4759632, 129.094547486deg)
+    ['rotate3d(1, 1, 0, 90deg)',
+     'rotate3d(0.3365568, 0.8125199, 0.4759632, 129.094547486deg)',
+     'rotate3d(0, 1, 1, 180deg)'],
   ],
   scale: [
     ['scaleX(0.5)', 'scaleX(0.75)', 'scaleX(1)'],
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/animation/transform-interpolation-rotate-slerp.html b/tests/wpt/web-platform-tests/css/css-transforms/animation/transform-interpolation-rotate-slerp.html
new file mode 100644
index 00000000000..ac11801bd40
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-transforms/animation/transform-interpolation-rotate-slerp.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="transform-interpolation-ref.html?rotateSlerp">
+<link rel="help" href="https://drafts.csswg.org/css-transforms/">
+
+<script src="../../../common/reftest-wait.js"></script>
+<script src="support/transform-interpolation-reftests.js"></script>
+
+<body>
+<script>
+createTests(transformTests.rotateSlerp);
+</script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html b/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
index 5296aa3a8bc..5c2b9e6f460 100644
--- a/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
+++ b/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-count.html
@@ -39,21 +39,21 @@
       }, "stylesheet.css should be unloaded and styleSheets.length === 0");
 
       // Verify that the styleSheets list length is back to 1 after loading a new sheet
-      test(function() {
+      async_test(function(t) {
 
         // create a css file reference
         var fileReference = document.createElement("link");
         fileReference.setAttribute("rel", "stylesheet");
         fileReference.setAttribute("type", "text/css");
         fileReference.setAttribute("href", "stylesheet-1.css");
+        fileReference.onerror = t.step_func_done(function() {
+          // assert that there is 1 styleSheet in the styleSheets property
+          assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
+        });
 
         // load the css file reference into the head section
         var head = document.getElementsByTagName("HEAD")[0];
         head.appendChild(fileReference);
-
-        // assert that there is 1 styleSheet in the styleSheets property
-        assert_equals(styleSheets.length, 1, "styleSheets.length is incorrect:");
-
       }, "stylesheet-1.css should be loaded and styleSheets.length === 1");
 
     </script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html b/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
index 795ead02f4b..2824401cb25 100644
--- a/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
+++ b/tests/wpt/web-platform-tests/css/cssom/ttwf-cssom-doc-ext-load-tree-order.html
@@ -21,7 +21,7 @@
 <body>
     <div id="log"></div>
     <script>
-
+    onload = function() {
       // Get the Document's styleSheets attribute
       var styleSheets = document.styleSheets;
 
@@ -50,7 +50,7 @@
       test(function() {
         assert_equals(styleSheets.item(4).title, "zebra", "title for item 1 is incorrect:");
       }, "styleSheets item 0 title must be zebra");
-
+    };
     </script>
 </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/not-001.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/not-001.html
new file mode 100644
index 00000000000..db1cf291c7e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/not-001.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<title>CSS Selectors Invalidation: complex :not()</title>
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  * {
+    color: yellow;
+  }
+  :not(.b ~ *) {
+    color: green;
+  }
+</style>
+<div id="b">
+</div>
+<div class="c">
+</div>
+<div class="d">
+</div>
+<script>
+  var black = "rgb(0, 0, 0)";
+  var blue = "rgb(0, 0, 255)";
+  var green = "rgb(0, 128, 0)";
+  var red = "rgb(255, 0, 0)";
+  var yellow = "rgb(255, 255, 0)";
+
+  test(() => {
+    assert_equals(getComputedStyle(document.querySelector("#b")).color, green);
+    assert_equals(getComputedStyle(document.querySelector(".c")).color, green);
+    assert_equals(getComputedStyle(document.querySelector(".d")).color, green);
+  }, "precondition");
+
+  test(() => {
+    document.getElementById("b").className = "b";
+    assert_equals(getComputedStyle(document.querySelector("#b")).color, green);
+    assert_equals(getComputedStyle(document.querySelector(".c")).color, yellow);
+    assert_equals(getComputedStyle(document.querySelector(".d")).color, yellow);
+  }, "Invalidation of sibling combinators in :not()");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/invalidation/not-002.html b/tests/wpt/web-platform-tests/css/selectors/invalidation/not-002.html
new file mode 100644
index 00000000000..811b125f8c1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/invalidation/not-002.html
@@ -0,0 +1,133 @@
+<!DOCTYPE html>
+<title>CSS Selectors Invalidation: complex :not()</title>
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  .b {
+    color: yellow;
+  }
+  /*Simple selector arguments */
+  .a :not(:not(.b, .c)) {
+    color: red;
+  }
+  /*Compound selector arguments */
+  .a :not(:not(.c#d, .e)) {
+    color: green;
+  }
+  /* Complex selector arguments */
+  .a .g>.b {
+    color: black;
+  }
+  .a :not(:not(.e+.f, .g>.b, .h)) {
+    color: blue;
+  }
+  .g>.b {
+    color: black;
+  }
+  .a .h {
+    color: black;
+  }
+  /* Nested */
+  .a+.c>.e {
+    color: black;
+  }
+  .c>.a+.e {
+    color: black;
+  }
+  .a+:not(:not(.b+.f, :is(.c>.e, .g))) {
+    color: red;
+  }
+  .c>.e {
+    color: black;
+  }
+</style>
+<div id="a1">
+  <div class="b" id="b1">
+    Red
+  </div>
+  <div class="c" id="c1">
+    Red
+  </div>
+  <div class="c" id="d">
+    Green
+  </div>
+  <div class="e" id="e1">
+    Green
+  </div>
+  <div class="f" id="f1">
+    Blue
+  </div>
+  <div class="g">
+    <div class="b" id="b2">
+      Blue
+      <div class="b" id="b3">
+        Red
+      </div>
+    </div>
+  </div>
+  <div class="h" id="h1">
+    Blue
+  </div>
+</div>
+<div class="c" id="c2">
+  <div id="a2"></div>
+  <div class="e" id="e2">
+    Red
+  </div>
+</div>
+<script>
+  document.body.offsetTop;
+
+  var black = "rgb(0, 0, 0)";
+  var blue = "rgb(0, 0, 255)";
+  var green = "rgb(0, 128, 0)";
+  var red = "rgb(255, 0, 0)";
+  var yellow = "rgb(255, 255, 0)";
+
+  test(() => {
+    assert_equals(getComputedStyle(b1).color, yellow);
+    assert_equals(getComputedStyle(b2).color, black);
+    assert_equals(getComputedStyle(b3).color, yellow);
+    assert_equals(getComputedStyle(c1).color, black);
+    assert_equals(getComputedStyle(d).color, black);
+    assert_equals(getComputedStyle(e1).color, black);
+    assert_equals(getComputedStyle(e2).color, black);
+    assert_equals(getComputedStyle(f1).color, black);
+    assert_equals(getComputedStyle(h1).color, black);
+  }, "Preconditions.");
+
+  test(() => {
+    a1.className = "a";
+    assert_equals(getComputedStyle(b1).color, red);
+    assert_equals(getComputedStyle(b3).color, red);
+    assert_equals(getComputedStyle(c1).color, red);
+  }, "Invalidate :not() for simple selector arguments.");
+
+  test(() => {
+    a1.className = "a";
+    assert_equals(getComputedStyle(d).color, green);
+  }, "Invalidate :not() for compound selector arguments.");
+
+  test(() => {
+    a1.className = "a";
+    assert_equals(getComputedStyle(b2).color, blue);
+    assert_equals(getComputedStyle(b3).color, red);
+    assert_equals(getComputedStyle(f1).color, blue);
+  }, "Invalidate :not() for complex selector arguments.");
+
+  test(() => {
+    a1.className = "a";
+    assert_equals(getComputedStyle(e2).color, black);
+    a2.className = "a";
+    assert_equals(getComputedStyle(e2).color, red);
+  }, "Invalidate nested :is() inside :not().");
+
+  test(() => {
+    a1.className = "a";
+    assert_equals(getComputedStyle(b2).color, blue);
+    assert_equals(getComputedStyle(h1).color, blue);
+  }, "Test specificity of :not().");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/is-default-ns-001.html b/tests/wpt/web-platform-tests/css/selectors/is-default-ns-001.html
new file mode 100644
index 00000000000..1c9a5a29e55
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/is-default-ns-001.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<title>Default namespace gets ignored inside non-type selectors for :is() / :not() / :where().</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
+<!--
+  Default namespace declarations do not affect the compound selector
+  representing the subject of any selector within a :is() pseudo-class, unless
+  that compound selector contains an explicit universal selector or type
+  selector.
+-->
+<link rel="match" href="/css/reference/blank.html">
+<style>
+@namespace url("http://www.w3.org/2000/svg");
+
+/* Type selector, so ns should apply and this should not match */
+*|*:is(div) {
+  width: 100px;
+  height: 100px;
+  background: red;
+}
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/selectors/is-default-ns-002.html b/tests/wpt/web-platform-tests/css/selectors/is-default-ns-002.html
new file mode 100644
index 00000000000..b86337f1679
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/is-default-ns-002.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>Default namespace gets ignored inside non-type selectors for :is() / :not() / :where().</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
+<!--
+  Default namespace declarations do not affect the compound selector
+  representing the subject of any selector within a :is() pseudo-class, unless
+  that compound selector contains an explicit universal selector or type
+  selector.
+-->
+<link rel="match" href="/css/reference/blank.html">
+<style>
+@namespace url("http://www.w3.org/2000/svg");
+
+/* No type selector, so selector should match and hide the <input> */
+*|*:is(:disabled) {
+  display: none;
+}
+</style>
+<input disabled>
diff --git a/tests/wpt/web-platform-tests/css/selectors/not-complex.html b/tests/wpt/web-platform-tests/css/selectors/not-complex.html
new file mode 100644
index 00000000000..8e092a4ec6c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/not-complex.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>Matching behavior for :not with complex selector list</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/selectors/#negation">
+
+<main id=main>
+  <div id=a><div id=d></div></div>
+  <div id=b><div id=e></div></div>
+  <div id=c><div id=f></div></div>
+</main>
+
+<script>
+  function formatElements(elements) {
+    return elements.map(e => e.id).sort().join();
+  }
+
+  // Test that |selector| returns the given elements in #main.
+  function test_selector(selector, expected) {
+    test(function() {
+      let actual = Array.from(main.querySelectorAll(selector));
+      assert_equals(formatElements(actual), formatElements(expected));
+    }, `${selector} matches expected elements`);
+  }
+
+  test_selector(':not(#a)', [b, c, d, e, f]);
+  test_selector(':not(#a #d)', [a, b, c, e, f]);
+  test_selector(':not(#b div)', [a, b, c, d, f]);
+  test_selector(':not(div div)', [a, b, c]);
+  test_selector(':not(div + div)', [a, d, e, f]);
+  test_selector(':not(main > div)', [d, e, f]);
+  test_selector(':not(#a, #b)', [c, d, e, f]);
+  test_selector(':not(#f, main > div)', [d, e]);
+  test_selector(':not(div + div + div, div + div > div)', [a, b, d]);
+  test_selector(':not(div:nth-child(1))', [b, c]);
+  test_selector(':not(:not(div))', [a, b, c, d, e, f]);
+  test_selector(':not(:not(:not(div)))', []);
+  test_selector(':not(div, span)', []);
+  test_selector(':not(span, p)', [a, b, c, d, e, f]);
+  test_selector(':not(#unknown, .unknown)', [a, b, c, d, e, f]);
+  test_selector(':not(#unknown > div, span)', [a, b, c, d, e, f]);
+  test_selector(':not(#unknown ~ div, span)', [a, b, c, d, e, f]);
+  test_selector(':not(:hover div)', [a, b, c, d, e, f]);
+  test_selector(':not(:link div)', [a, b, c, d, e, f]);
+  test_selector(':not(:visited div)', [a, b, c, d, e, f]);
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/not-default-ns-001.html b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-001.html
new file mode 100644
index 00000000000..ff8f540bc37
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-001.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>Default namespace gets ignored inside non-type selectors for :is() / :not() / :where().</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation">
+<!--
+  Default namespace declarations do not affect the compound selector
+  representing the subject of any selector within a :not() pseudo-class, unless
+  that compound selector contains an explicit universal selector or type
+  selector.
+-->
+<link rel="match" href="/css/reference/blank.html">
+<style>
+@namespace url("http://www.w3.org/2000/svg");
+
+*|div {
+  width: 100px;
+  height: 100px;
+  background: red;
+}
+
+/* Type selector, so ns should apply and this should match */
+*|*:not(div) {
+  display: none;
+}
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/selectors/not-default-ns-002.html b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-002.html
new file mode 100644
index 00000000000..3d70ed0a87e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-002.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>Default namespace gets ignored inside non-type selectors for :is() / :not() / :where().</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation">
+<!--
+  Default namespace declarations do not affect the compound selector
+  representing the subject of any selector within a :not() pseudo-class, unless
+  that compound selector contains an explicit universal selector or type
+  selector.
+-->
+<link rel="match" href="/css/reference/blank.html">
+<style>
+@namespace url("http://www.w3.org/2000/svg");
+
+*|input {
+  display: none;
+}
+
+/* No type selector, so selector should _not_ match and keep the input hidden */
+*|input:not(:disabled) {
+  display: initial;
+}
+</style>
+<input disabled>
diff --git a/tests/wpt/web-platform-tests/css/selectors/not-default-ns-003.html b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-003.html
new file mode 100644
index 00000000000..f5aab27fab4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/not-default-ns-003.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Default namespace respected inside :is() for non-subject compounds</title>
+<link rel="help" href="https://drafts.csswg.org/selectors-4/#negation">
+<link rel="match" href="/css/reference/blank.html">
+<!--
+  As with :is(), default namespace declarations do not affect the compound
+  selector representing the *subject* of any selector within a :not()
+  pseudo-class, unless that compound selector contains an explicit universal
+  selector or type selector.
+-->
+<style>
+@namespace "http://www.w3.org/1999/xhtml";
+
+*|*.a {
+  display:initial;
+}
+
+/* This should apply, since the '.container' compound is affected by the
+   default namespace (even though the '.a' compound is not). */
+*|g *|*:not(.container .a) {
+  display:none;
+}
+
+</style>
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100">
+  <g class=container>
+    <text class="a" y="1em">FAIL if this text is visible</text>
+  </g>
+</svg>
diff --git a/tests/wpt/web-platform-tests/css/selectors/not-specificity.html b/tests/wpt/web-platform-tests/css/selectors/not-specificity.html
new file mode 100644
index 00000000000..d9a2a4ddffa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/selectors/not-specificity.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Specificity for complex :not selectors</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/selectors/#negation">
+<style>
+  main :not(#foo) { --t0:PASS; }
+  main :not(.foo) { --t0:FAIL; }
+
+  main :not(div#foo) { --t1:PASS; }
+  main :not(#foo) { --t1:FAIL; }
+
+  main :not(.bar, #foo) { --t2:FAIL; }
+  main :not(#foo, .bar) { --t2:PASS; }
+
+  main :not(.bar, #foo) { --t3:PASS; }
+  main :not(.foo, .bar) { --t3:FAIL; }
+
+  main :not(span + span) { --t4:PASS; }
+  main :not(span) { --t4:FAIL; }
+
+  main :not(span, li, #foo) { --t5:PASS; }
+  main :not(span, li, p) { --t5:FAIL; }
+
+  main :not(span, :not(:not(.a#foo)), p) { --t6:PASS; }
+  main :not(span, #foo, p) { --t6:FAIL; }
+
+  main :not(span, #foo, p) { --t7:PASS; }
+  main :not(span, :where(.a#foo), p) { --t7:FAIL; }
+</style>
+<main id=main>
+  <div id=div></div>
+</main>
+<script>
+  function test_value(name, description) {
+    test(function() {
+      let actual = getComputedStyle(div).getPropertyValue(name);
+      assert_equals(actual, 'PASS');
+    }, description);
+  }
+
+  test_value('--t0', ':not(#foo) wins over :not(.foo)');
+  test_value('--t1', ':not(div#foo) wins over :not(#foo)');
+  test_value('--t2', ':not(.bar, #foo) has same specificity as :not(#foo, .bar)');
+  test_value('--t3', ':not(.bar, #foo) wins over :not(.foo, .bar)');
+  test_value('--t4', ':not(span + span) wins over :not(span)');
+  test_value('--t5', ':not(span, li, p) wins over :not(span, lo, p)');
+  test_value('--t6', ':not(span, :not(:not(.a#foo)), p) wins over :not(span, #foo, p)');
+  test_value('--t7', ':not(span, #foo, p) wins over :not(span, :where(.a#foo), p)');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/selectors/parsing/parse-not.html b/tests/wpt/web-platform-tests/css/selectors/parsing/parse-not.html
index 3895683d1c8..e96db5a83ce 100644
--- a/tests/wpt/web-platform-tests/css/selectors/parsing/parse-not.html
+++ b/tests/wpt/web-platform-tests/css/selectors/parsing/parse-not.html
@@ -14,4 +14,22 @@
   test_valid_selector(':not(:hover)');
   test_valid_selector(':not(*|*)', ':not(*)');
   test_valid_selector('foo:not(bar)');
+  test_valid_selector(':not(:not(foo))');
+  test_valid_selector(':not(.a .b)');
+  test_valid_selector(':not(.a + .b)');
+  test_valid_selector(':not(.a .b ~ c)');
+  test_valid_selector(':not(span.a, div.b)');
+  test_valid_selector(':not(.a .b ~ c, .d .e)');
+  test_valid_selector(':not(:host)');
+  test_valid_selector(':not(:host(.a))');
+  test_valid_selector(':host(:not(.a))');
+  test_valid_selector(':not(:host(:not(.a)))');
+
+  test_invalid_selector(':not()');
+  test_invalid_selector(':not(:not())');
+  test_invalid_selector(':not(::before)');
+  test_invalid_selector(':not(:unknownpseudo)');
+  test_invalid_selector(':not(.a, :unknownpseudo)');
+  test_invalid_selector(':not(:unknownpseudo, .a)');
+  test_invalid_selector(':host(:not(.a .b))');
 </script>
diff --git a/tests/wpt/web-platform-tests/shadow-dom/declarative/element-internals-shadowroot.tentative.html b/tests/wpt/web-platform-tests/custom-elements/element-internals-shadowroot.html
similarity index 98%
rename from tests/wpt/web-platform-tests/shadow-dom/declarative/element-internals-shadowroot.tentative.html
rename to tests/wpt/web-platform-tests/custom-elements/element-internals-shadowroot.html
index aeaa322a31c..0afd43dd637 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/declarative/element-internals-shadowroot.tentative.html
+++ b/tests/wpt/web-platform-tests/custom-elements/element-internals-shadowroot.html
@@ -2,7 +2,7 @@
 <meta charset="utf-8">
 <title>ElementInternals.shadowRoot</title>
 <link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
-<link rel="help" href="https://github.com/w3c/webcomponents/issues/871">
+<link rel="help" href="https://html.spec.whatwg.org/#dom-elementinternals-shadowroot">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
diff --git a/tests/wpt/web-platform-tests/editing/data/delete.js b/tests/wpt/web-platform-tests/editing/data/delete.js
index 00b61178c74..7fa2c4cfdfc 100644
--- a/tests/wpt/web-platform-tests/editing/data/delete.js
+++ b/tests/wpt/web-platform-tests/editing/data/delete.js
@@ -2555,4 +2555,9 @@ var browserTests = [
     "<div>abcdef</div>",
     [true],
     {"delete":[false,false,"",false,false,""]}],
+["foo<img contenteditable=false src=/img/lion.svg>[]bar",
+    [["delete",""]],
+    "foo{}bar",
+    [true],
+    {"delete":[false,false,"",false,false,""]}],
 ]
diff --git a/tests/wpt/web-platform-tests/editing/data/forwarddelete.js b/tests/wpt/web-platform-tests/editing/data/forwarddelete.js
index b636a95e8a0..90310f8c2c8 100644
--- a/tests/wpt/web-platform-tests/editing/data/forwarddelete.js
+++ b/tests/wpt/web-platform-tests/editing/data/forwarddelete.js
@@ -2440,4 +2440,9 @@ var browserTests = [
     "<div>abcdef</div>",
     [true],
     {"forwarddelete":[false,false,"",false,false,""]}],
+["foo[]<img contenteditable=false src=/img/lion.svg>bar",
+    [["forwarddelete",""]],
+    "foo{}bar",
+    [true],
+    {"forwarddelete":[false,false,"",false,false,""]}],
 ]
diff --git a/tests/wpt/web-platform-tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.html b/tests/wpt/web-platform-tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.html
index eceef92a641..af4542e55fd 100644
--- a/tests/wpt/web-platform-tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.html
+++ b/tests/wpt/web-platform-tests/html/rendering/replaced-elements/attributes-for-embedded-content-and-images/img-aspect-ratio.html
@@ -14,11 +14,13 @@
 <img src="" width=100 height=125>
 <img src="error.png" width=100 height=125>
 <img src="error.png">
+<img src="error.png" alt="Alt text" width=100 height=500>
 <script>
 let t = async_test("Image width and height attributes are used to infer aspect-ratio");
-function assert_ratio(img, expected) {
+function assert_ratio(img, expected, description) {
   let epsilon = 0.001;
-  assert_approx_equals(parseFloat(getComputedStyle(img).width, 10) / parseFloat(getComputedStyle(img).height, 10), expected, epsilon);
+  assert_approx_equals(parseFloat(getComputedStyle(img).width, 10) / parseFloat(getComputedStyle(img).height, 10),
+                       expected, epsilon, description);
 }
 // Create and append a new image and immediately check the ratio.
 // This is not racy because the spec requires the user agent to queue a task:
@@ -49,10 +51,11 @@ t.step(function() {
 
 onload = t.step_func_done(function() {
   let images = document.querySelectorAll("img");
-  assert_ratio(images[0], 2.0); // Loaded image's aspect ratio, at least by default, overrides width / height ratio.
-  assert_ratio(images[1], 2.0); // 2.0 is the original aspect ratio of green.png
-  assert_equals(getComputedStyle(images[2]).height, "0px"); // aspect-ratio doesn't override intrinsic size of images that don't have any src.
-  assert_equals(getComputedStyle(images[3]).height, getComputedStyle(images[4]).height); // aspect-ratio doesn't override intrinsic size of error images.
-  assert_ratio(images[5], 133/106); // The original aspect ratio of blue.png
+  assert_ratio(images[0], 2.0, "2.0 is the original aspect ratio of green.png");
+  assert_ratio(images[1], 2.0, "Loaded image's aspect ratio, at least by default, overrides width / height ratio.");
+  assert_ratio(images[2], 100/125, "aspect-ratio should override intrinsic size of images that don't have any src.");
+  assert_ratio(images[3], 100/125, "aspect-ratio should affect the size of error images.");
+  assert_not_equals(images[5].offsetHeight, 500, "Images with alt text should be inline and ignore the aspect ratio");
+  assert_ratio(images[6], 133/106, "The original aspect ratio of blue.png");
 });
 </script>
diff --git a/tests/wpt/web-platform-tests/paint-timing/fcp-only/fcp-ensure-update-the-rendering-step.html b/tests/wpt/web-platform-tests/paint-timing/fcp-only/fcp-ensure-update-the-rendering-step.html
deleted file mode 100644
index 700707de33a..00000000000
--- a/tests/wpt/web-platform-tests/paint-timing/fcp-only/fcp-ensure-update-the-rendering-step.html
+++ /dev/null
@@ -1,55 +0,0 @@
-<!DOCTYPE html>
-<head>
-    <title>
-      Ensure the timing is marked during the `update the rendering` step.
-    </title>
-</head>
-<style>
-    #main {
-        width: 100px;
-        height: 100px;
-        left: 0px;
-        position: relative;
-        top: 0;
-        background-image: url(../resources/circles.png);
-        opacity: 0;
-    }
-
-    #main.contentful {
-        opacity: 0.1;
-    }
-</style>
-<body>
-<script src="../resources/utils.js"></script>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<div id="main"></div>
-<script>
-setup({"hide_test_state": true});
-async_test(function (t) {
-    assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
-    let fired = false;
-    const main = document.getElementById('main');
-    let animationFrameStamps = [];
-    requestAnimationFrame(function frame(stamp) {
-        animationFrameStamps.unshift(stamp);
-        main.className = "contentful";
-        while (performance.now() - stamp <= 5) {
-          /* Busy-wait */
-        }
-        if(!fired)
-            requestAnimationFrame(frame);
-    });
-    new PerformanceObserver(t.step_func(list=>{
-        for (let entry of list.getEntries()) {
-            if (entry.name == "first-contentful-paint") {
-                fired = true;
-                assert_any(assert_approx_equals, entry.startTime, animationFrameStamps, 1, "One of the past requestAnimationFrame should have the same timestamp as paint entry");
-                t.done();
-            }
-        }
-    })).observe({type: "paint"});
-}, 'The first-contentful-paint timestamp should be same as the last RAF');
-</script>
-</body>
-</html>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_auxclick_is_a_pointerevent.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_auxclick_is_a_pointerevent.html
new file mode 100644
index 00000000000..8c25125a4f0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_auxclick_is_a_pointerevent.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<title>auxclick is a PointerEvent</title>
+<link rel="help" href="https://github.com/w3c/pointerevents/pull/317">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<input id="target" style="margin: 20px">
+
+<script>
+  'use strict';
+  let auxclickTest = async_test("auxclick is a PointerEvent");
+  let target = document.getElementById("target");
+
+  target.addEventListener("auxclick", auxclickTest.step_func((e)=>{
+    assert_true(e instanceof PointerEvent, "auxclick should be a PointerEvent");
+  }));
+  let eventWatcher = new EventWatcher(auxclickTest, target, ["auxclick"]);
+  let actions = new test_driver.Actions();
+  actions = actions.pointerMove(0,0, {origin:target})
+    .pointerDown({button:actions.ButtonType.MIDDLE})
+    .pointerUp({button:actions.ButtonType.MIDDLE});
+  Promise.all([eventWatcher.wait_for("auxclick"), actions.send()]).then(()=>auxclickTest.done());
+</script>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_is_a_pointerevent.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_is_a_pointerevent.html
new file mode 100644
index 00000000000..ba20919ebe0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_click_is_a_pointerevent.html
@@ -0,0 +1,21 @@
+<!DOCTYPE HTML>
+<title>click is a PointerEvent</title>
+<link rel="help" href="https://github.com/w3c/pointerevents/pull/317">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<input id="target" style="margin: 20px">
+
+<script>
+  'use strict';
+  let clickTest = async_test("click is a PointerEvent");
+  let target = document.getElementById("target");
+
+  target.addEventListener("click", clickTest.step_func((e)=>{
+    assert_true(e instanceof PointerEvent, "click should be a PointerEvent");
+  }));
+  let eventWatcher = new EventWatcher(clickTest, target, ["click"]);
+  Promise.all([eventWatcher.wait_for("click"), test_driver.click(target)]).then(()=>clickTest.done());
+</script>
diff --git a/tests/wpt/web-platform-tests/pointerevents/pointerevent_contextmenu_is_a_pointerevent.html b/tests/wpt/web-platform-tests/pointerevents/pointerevent_contextmenu_is_a_pointerevent.html
new file mode 100644
index 00000000000..4f5b2434b40
--- /dev/null
+++ b/tests/wpt/web-platform-tests/pointerevents/pointerevent_contextmenu_is_a_pointerevent.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<title>contexmenu is a PointerEvent</title>
+<link rel="help" href="https://github.com/w3c/pointerevents/pull/317">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<input id="target" style="margin: 20px">
+
+<script>
+  'use strict';
+  let contextmenuTest = async_test("contextmenu is a PointerEvent");
+  let target = document.getElementById("target");
+
+  target.addEventListener("contextmenu", contextmenuTest.step_func((e)=>{
+    assert_true(e instanceof PointerEvent, "contextmenu should be a PointerEvent");
+  }));
+  let eventWatcher = new EventWatcher(contextmenuTest, target, ["contextmenu"]);
+  let actions = new test_driver.Actions();
+  actions = actions.pointerMove(0,0, {origin:target})
+    .pointerDown({button:actions.ButtonType.RIGHT})
+    .pointerUp({button:actions.ButtonType.RIGHT});
+  Promise.all([eventWatcher.wait_for("contextmenu"), actions.send()]).then(()=>contextmenuTest.done());
+</script>
diff --git a/tests/wpt/web-platform-tests/scroll-animations/css/animation-timeline-multiple.html b/tests/wpt/web-platform-tests/scroll-animations/css/animation-timeline-multiple.html
new file mode 100644
index 00000000000..61cfce9cb15
--- /dev/null
+++ b/tests/wpt/web-platform-tests/scroll-animations/css/animation-timeline-multiple.html
@@ -0,0 +1,95 @@
+<!DOCTYPE html>
+<title>animation-timeline with multiple timelines</title>
+<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<style>
+  #scrollers {
+    overflow: hidden;
+    height: 0px;
+  }
+  #scrollers > div {
+    overflow: scroll;
+    width: 100px;
+    height: 100px;
+  }
+  #scrollers > div > div {
+    height: 200px;
+  }
+
+  @keyframes top {
+    from { top: 100px; }
+    to { top: 200px; }
+  }
+  @keyframes bottom {
+    from { bottom: 100px; }
+    to { bottom: 200px; }
+  }
+  @keyframes left {
+    from { left: 100px; }
+    to { left: 200px; }
+  }
+  @keyframes right {
+    from { right: 100px; }
+    to { right: 200px; }
+  }
+
+  @scroll-timeline top_timeline {
+    source: selector(#scroller1);
+    time-range: 10s;
+    start: 0px;
+    end: 100px;
+  }
+  @scroll-timeline bottom_timeline {
+    source: selector(#scroller1);
+    time-range: 10s;
+    start: 0px;
+    end: 80px;
+  }
+  @scroll-timeline left_timeline {
+    source: selector(#scroller2);
+    time-range: 10s;
+    start: 0px;
+    end: 100px;
+  }
+  @scroll-timeline right_timeline {
+    source: selector(#scroller2);
+    time-range: 10s;
+    start: 20px;
+    end: 60px;
+  }
+
+  #element {
+    animation-name: top, bottom, left, right;
+    animation-duration: 10s;
+    animation-timing-function: linear;
+    animation-timeline: top_timeline, bottom_timeline, left_timeline, right_timeline;
+  }
+  /* Ensure stable expectations if feature is not supported */
+  @supports not (animation-timeline:foo) {
+    #element { animation-play-state: paused; }
+  }
+</style>
+<div id=scrollers>
+  <div id=scroller1><div></div></div>
+  <div id=scroller2><div></div></div>
+</div>
+<div id=element></div>
+<script>
+  // Force layout of scrollers.
+  scroller1.offsetTop;
+  scroller2.offsetTop;
+
+  scroller1.scrollTop = 20;
+  scroller2.scrollTop = 40;
+
+  promise_test(async (t) => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).top, '120px');
+    assert_equals(getComputedStyle(element).bottom, '125px');
+    assert_equals(getComputedStyle(element).left, '140px');
+    assert_equals(getComputedStyle(element).right, '150px');
+  }, 'animation-timeline works with multiple timelines');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/scroll-animations/css/at-scroll-timeline-ignored.tentative.html b/tests/wpt/web-platform-tests/scroll-animations/css/at-scroll-timeline-ignored.tentative.html
new file mode 100644
index 00000000000..1ea61f44e3f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/scroll-animations/css/at-scroll-timeline-ignored.tentative.html
@@ -0,0 +1,159 @@
+<!DOCTYPE html>
+<link rel="help" src="https://github.com/w3c/csswg-drafts/pull/5666">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<style>
+  #scrollers {
+    overflow: hidden;
+    height: 0px;
+  }
+  #scrollers > div {
+    overflow: scroll;
+    width: 100px;
+    height: 100px;
+  }
+  #scrollers > div > div {
+    height: 200px;
+  }
+  @keyframes expand {
+    from { width: 100px; }
+    to { width: 200px; }
+  }
+  @scroll-timeline timeline1 {
+    source: selector(#scroller1);
+    orientation: auto;
+    time-range: 1e10s;
+    start: 0px;
+    end: 100px;
+  }
+  @scroll-timeline timeline2 {
+    source: selector(#scroller2);
+    orientation: auto;
+    time-range: 1e10s;
+    start: 0px;
+    end: 100px;
+  }
+  @scroll-timeline timeline3 {
+    source: selector(#scroller3);
+    orientation: auto;
+    time-range: 1e10s;
+    start: 0px;
+    end: 100px;
+  }
+  #element {
+    width: 0px;
+    height: 20px;
+    animation-name: expand;
+    animation-duration: 1e10s;
+    animation-timing-function: linear;
+    animation-timeline: timeline1;
+  }
+  /* Ensure stable expectations if feature is not supported */
+  @supports not (animation-timeline:foo) {
+    #element { animation-play-state: paused; }
+  }
+</style>
+<div id=scrollers>
+  <div id=scroller1><div></div></div>
+  <div id=scroller2><div></div></div>
+  <div id=scroller3><div></div></div>
+  <div id=scroller4><div></div></div>
+</div>
+<div id=container></div>
+<script>
+  // Force layout of scrollers.
+  scroller1.offsetTop;
+  scroller2.offsetTop;
+  scroller3.offsetTop;
+  scroller4.offsetTop;
+
+  scroller1.scrollTop = 20;
+  scroller2.scrollTop = 40;
+  scroller3.scrollTop = 60;
+  scroller4.scrollTop = 80;
+
+  // Create #element in #container, run |func|, then clean up afterwards.
+  function test_animation_timeline(func, description) {
+    promise_test(async () => {
+      try {
+        let element = document.createElement('element');
+        element.setAttribute('id', 'element');
+        container.append(element);
+        await func();
+      } finally {
+        while (container.firstChild)
+          container.firstChild.remove();
+      }
+    }, description);
+  }
+
+  test_animation_timeline(async () => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).width, '120px');
+    element.style = 'animation-timeline:timeline2';
+    assert_equals(getComputedStyle(element).width, '140px');
+  }, 'Changing animation-timeline changes the timeline (sanity check)');
+
+  test_animation_timeline(async () => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).width, '120px');
+
+    // Set a (non-CSS) ScrollTimeline on the CSSAnimation.
+    let timeline4 = new ScrollTimeline({
+      scrollSource: scroller4,
+      timeRange: 1e13,
+      startScrollOffset: CSS.px(0),
+      endScrollOffset: CSS.px(100)
+    });
+
+    element.getAnimations()[0].timeline = timeline4;
+    assert_equals(getComputedStyle(element).width, '180px');
+
+    // Changing the animation-timeline property should have no effect.
+    element.style = 'animation-timeline:timeline2';
+    assert_equals(getComputedStyle(element).width, '180px');
+  }, 'animation-timeline ignored after setting timeline with JS (ScrollTimeline from JS)');
+
+  test_animation_timeline(async () => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).width, '120px');
+    let animation = element.getAnimations()[0];
+    let timeline1 = animation.timeline;
+
+    element.style = 'animation-timeline:timeline2';
+    assert_equals(getComputedStyle(element).width, '140px');
+
+    animation.timeline = timeline1;
+    assert_equals(getComputedStyle(element).width, '120px');
+
+    // Should have no effect.
+    element.style = 'animation-timeline:timeline3';
+    assert_equals(getComputedStyle(element).width, '120px');
+  }, 'animation-timeline ignored after setting timeline with JS (ScrollTimeline from CSS)');
+
+  test_animation_timeline(async () => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).width, '120px');
+    element.getAnimations()[0].timeline = document.timeline;
+
+    // (The animation continues from where the previous timeline left it).
+    assert_equals(getComputedStyle(element).width, '120px');
+
+    // Changing the animation-timeline property should have no effect.
+    element.style = 'animation-timeline:timeline2';
+    assert_equals(getComputedStyle(element).width, '120px');
+  }, 'animation-timeline ignored after setting timeline with JS (document timeline)');
+
+  test_animation_timeline(async () => {
+    await waitForNextFrame();
+    assert_equals(getComputedStyle(element).width, '120px');
+    element.getAnimations()[0].timeline = null;
+    assert_equals(getComputedStyle(element).width, '0px');
+
+    // Changing the animation-timeline property should have no effect.
+    element.style = 'animation-timeline:timeline2';
+    assert_equals(getComputedStyle(element).width, '0px');
+  }, 'animation-timeline ignored after setting timeline with JS (null)');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html
index 1e1ac7a0561..b78902c4b59 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html
@@ -35,7 +35,6 @@ function testElementType(allowed, nochildren, elementType, mode, delegatesFocus)
       assert_equals(element.children[0].textContent, lightDomTextContent);
       let originalShadowRoot = null;
       if (mode === 'open') {
-        // TODO(masonfreed): Add a check for ElementInternals.shadowRoot once that exists.
         assert_true(!!element.shadowRoot, 'Shadow root should be present');
         assert_equals(element.shadowRoot.innerHTML, shadowContent, 'Correct shadow content');
         assert_equals(element.shadowRoot.delegatesFocus,delegatesFocus,'Correct delegatesFocus')
@@ -46,7 +45,6 @@ function testElementType(allowed, nochildren, elementType, mode, delegatesFocus)
       const oppositeMode = (mode === 'open') ? 'closed' : 'open';
       const newShadow = element.attachShadow({mode: oppositeMode}); // Should be no exception here
       if (mode === 'open') {
-        // TODO(masonfreed): Add a check for ElementInternals.shadowRoot once that exists.
         assert_equals(element.shadowRoot, originalShadowRoot, 'The same shadow root should be returned');
         assert_equals(element.shadowRoot.innerHTML, '', 'Empty shadow content');
         assert_equals(element.shadowRoot.mode, mode, 'Original shadow mode');
diff --git a/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html
index a72cf70ef66..92e667fdbcf 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html
@@ -213,7 +213,6 @@ test(() => {
   document.body.appendChild(host);
   host.appendChild(template.content.cloneNode(true));
   let innerDiv = host.querySelector('div.innerdiv');
-  // TODO(masonfreed): once ElementInternals.shadowRoot exists, check for it here.
   assert_true(!innerDiv.shadowRoot,"Inner div should have a closed shadow root");
 }, 'Declarative Shadow DOM: template containing closed declarative shadow root and UA shadow root');
 </script>
diff --git a/tests/wpt/web-platform-tests/url/README.md b/tests/wpt/web-platform-tests/url/README.md
index 823a8eec022..50a71bb482d 100644
--- a/tests/wpt/web-platform-tests/url/README.md
+++ b/tests/wpt/web-platform-tests/url/README.md
@@ -44,6 +44,10 @@ expected to fail.
 Tests in `/encoding` and `/html/infrastructure/urls/resolving-urls/query-encoding/` cover the
 encoding argument to the URL parser.
 
+There's also limited coverage in `resources/percent-encoding.json` for percent-encode after encoding
+with _percentEncodeSet_ set to special-query percent-encode set and _spaceAsPlus_ set to false.
+(Improvements to expand coverage here are welcome.)
+
 ## Specification
 
 The tests in this directory assert conformance with [the URL Standard][URL].
diff --git a/tests/wpt/web-platform-tests/url/percent-encoding.window.js b/tests/wpt/web-platform-tests/url/percent-encoding.window.js
new file mode 100644
index 00000000000..dcb5c1e55b2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/url/percent-encoding.window.js
@@ -0,0 +1,33 @@
+promise_test(() => fetch("resources/percent-encoding.json").then(res => res.json()).then(runTests), "Loading data…");
+
+function runTests(testUnits) {
+  for (const testUnit of testUnits) {
+    // Ignore comments
+    if (typeof testUnit === "string") {
+      continue;
+    }
+    for (const encoding of Object.keys(testUnit.output)) {
+      async_test(t => {
+        const frame = document.body.appendChild(document.createElement("iframe"));
+        t.add_cleanup(() => frame.remove());
+        frame.onload = t.step_func_done(() => {
+          const output = frame.contentDocument.querySelector("a");
+          // Test that the fragment is always UTF-8 encoded
+          assert_equals(output.hash, `#${testUnit.output["utf-8"]}`, "fragment");
+          assert_equals(output.search, `?${testUnit.output[encoding]}`, "query");
+        });
+        frame.src = `resources/percent-encoding.py?encoding=${encoding}&value=${toBase64(testUnit.input)}`;
+      }, `Input ${testUnit.input} with encoding ${encoding}`);
+    }
+  }
+}
+
+// Use base64 to avoid relying on the URL parser to get UTF-8 percent-encoding correctly. This does
+// not use btoa directly as that only works with code points in the range U+0000 to U+00FF,
+// inclusive.
+function toBase64(input) {
+  const bytes = new TextEncoder().encode(input);
+  const byteString = Array.from(bytes, byte => String.fromCharCode(byte)).join("");
+  const encoded = self.btoa(byteString);
+  return encoded;
+}
diff --git a/tests/wpt/web-platform-tests/url/resources/percent-encoding.json b/tests/wpt/web-platform-tests/url/resources/percent-encoding.json
new file mode 100644
index 00000000000..eccd1db62fe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/url/resources/percent-encoding.json
@@ -0,0 +1,48 @@
+[
+  "Tests for percent-encoding.",
+  {
+    "input": "\u2020",
+    "output": {
+      "big5": "%26%238224%3B",
+      "euc-kr": "%A2%D3",
+      "utf-8": "%E2%80%A0",
+      "windows-1252": "%86"
+    }
+  },
+  "This uses a trailing A to prevent the URL parser from trimming the C0 control.",
+  {
+    "input": "\u000EA",
+    "output": {
+      "big5": "%0EA",
+      "iso-2022-jp": "%26%2365533%3BA",
+      "utf-8": "%0EA"
+    }
+  },
+  {
+    "input": "\u203E\u005C",
+    "output": {
+      "iso-2022-jp": "%1B(J~%1B(B\\",
+      "utf-8": "%E2%80%BE\\"
+    }
+  },
+  {
+    "input": "\uE5E5",
+    "output": {
+      "gb18030": "%26%2358853%3B",
+      "utf-8": "%EE%97%A5"
+    }
+  },
+  {
+    "input": "\u2212",
+    "output": {
+      "shift_jis": "%81|",
+      "utf-8": "%E2%88%92"
+    }
+  },
+  {
+    "input": "á|",
+    "output": {
+      "utf-8": "%C3%A1|"
+    }
+  }
+]
diff --git a/tests/wpt/web-platform-tests/url/resources/percent-encoding.py b/tests/wpt/web-platform-tests/url/resources/percent-encoding.py
new file mode 100644
index 00000000000..f7228871205
--- /dev/null
+++ b/tests/wpt/web-platform-tests/url/resources/percent-encoding.py
@@ -0,0 +1,23 @@
+import base64
+from wptserve.utils import isomorphic_decode
+
+# Use numeric references to let the HTML parser take care of inserting the correct code points
+# rather than trying to figure out the necessary bytes for each encoding. (The latter can be
+# especially tricky given that Python does not implement the Encoding Standard.)
+def numeric_references(input):
+    output = b""
+    for cp in input:
+        output += b"&#x" + format(ord(cp), b"X") + b";"
+    return output
+
+def main(request, response):
+    # Undo the "magic" space with + replacement as otherwise base64 decoding will fail.
+    value = request.GET.first(b"value").replace(" ", "+")
+    encoding = request.GET.first(b"encoding")
+
+    output_value = numeric_references(base64.b64decode(value).decode(b"utf-8"))
+    return (
+        [(b"Content-Type", b"text/html;charset=" + encoding)],
+        b"""<!doctype html>
+<a href="https://doesnotmatter.invalid/?%s#%s">test</a>
+""" % (output_value, output_value))
diff --git a/tests/wpt/web-platform-tests/xhr/resources/get-set-cookie.py b/tests/wpt/web-platform-tests/xhr/resources/get-set-cookie.py
index cdba642fca9..234280d3530 100644
--- a/tests/wpt/web-platform-tests/xhr/resources/get-set-cookie.py
+++ b/tests/wpt/web-platform-tests/xhr/resources/get-set-cookie.py
@@ -9,10 +9,10 @@ def main(request, response):
         # If deleting, expire yesterday.
         expiration = -datetime.timedelta(days=1)
 
-    response.set_cookie(b"WK-test", b"1", expires=expiration);
+    response.set_cookie(b"WK-test", b"1", expires=expiration)
     response.set_cookie(b"WK-test-secure", b"1", secure=True,
-                        expires=expiration);
-    content = ""
+                        expires=expiration)
+    content = b""
     for cookie in request.cookies:
         content = content + b" " + cookie + b"=" + request.cookies.get(cookie).value
     response.content = content