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
new file mode 100644
index 00000000000..f64b45fea6b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[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/flex-aspect-ratio-img-row-013.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/flex-aspect-ratio-img-row-013.html.ini
new file mode 100644
index 00000000000..eba48c8914e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/flex-aspect-ratio-img-row-013.html.ini
@@ -0,0 +1,10 @@
+[flex-aspect-ratio-img-row-013.html]
+  [img 1]
+    expected: FAIL
+
+  [img 2]
+    expected: FAIL
+
+  [img 3]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-011.html.ini b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-011.html.ini
new file mode 100644
index 00000000000..ddde7788d61
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-011.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-011.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-013.html.ini b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-013.html.ini
new file mode 100644
index 00000000000..abfa0f1c4e1
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-013.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-013.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-015.html.ini b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-015.html.ini
new file mode 100644
index 00000000000..fdca1f9bf5a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-015.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-015.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-016.html.ini b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-016.html.ini
new file mode 100644
index 00000000000..9af0921a3c7
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-text/white-space/trailing-ideographic-space-016.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-016.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini
new file mode 100644
index 00000000000..e7b72ff95e6
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini
@@ -0,0 +1,2 @@
+[preserve-3d-flat-grouping-properties-containing-block.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini
new file mode 100644
index 00000000000..9a64545af67
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini
@@ -0,0 +1,2 @@
+[preserve-3d-flat-grouping-properties.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e274..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index e32d8b07845..bb730319011 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
@@ -312,21 +312,21 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" 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>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
index 258fe374697..5c001592859 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
@@ -56,6 +56,6 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript ]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
index 369bf4d4fa4..30e1b851fd4 100644
--- a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,3 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
-  [Content-Type-Options%3A%20nosniff]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 00000000000..75d75b4cda2
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
new file mode 100644
index 00000000000..735a9a75a2a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
@@ -0,0 +1,2 @@
+[cross-origin-objects-on-new-window.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 16fa2c5cfc1..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    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 9a85a905394..8e2a63e3b7f 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
@@ -1,4 +1,5 @@
 [embedded-opener-remove-frame.html]
+  expected: CRASH
   [opener of discarded nested browsing context]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index c6f45be1eb2..e63fe7c263e 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-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..d913fcbb129 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 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 0407f0cc2b7..9eb581fcf1f 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index f4f994c5d6f..7a36937927c 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
new file mode 100644
index 00000000000..633a99517d3
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-2.html]
+  [preventDefault should allow onclick submit() to succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
new file mode 100644
index 00000000000..9f416703229
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-3.html]
+  [<button> should have the same double-submit protection as <input type=submit>]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit.html.ini
deleted file mode 100644
index b193c33c2b6..00000000000
--- a/tests/wpt/metadata-layout-2020/html/semantics/forms/form-submission-0/form-double-submit.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[form-double-submit.html]
-  [default submit action should supersede onclick submit()]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index ed872bb35ff..b1aa0f1f1c4 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -8,3 +8,6 @@
   [Check that rel=noopener with target=_parent does a normal load]
     expected: FAIL
 
+  [Check that rel=noopener with target=_self does a normal load]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
new file mode 100644
index 00000000000..59a54fe88e4
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
@@ -0,0 +1,4 @@
+[module-delayed.html]
+  [async document.write in a module]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index dbec6f2c2ff..450c88bd32b 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -3,3 +3,6 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
+  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
+    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 70174f02b62..86e1569f11b 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
@@ -245,3 +245,9 @@
   [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\]\t2.7146387523941948e-32\t9.3139332532882690e-1\t9.3139332532882690e-1\t1.0000000000000000e+0\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 9.3139332532882690e-1 at index of 28696.\n\tMax RelError of 1.0000000000000000e+0 at index of 28696.\n]
     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\]\t2.1021796856075525e-3\t9.3139332532882690e-1\t9.2929114564321935e-1\t9.9774297321181105e-1\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 9.2929114564321935e-1 at index of 28696.\n\tMax RelError of 9.9774297321181105e-1 at index of 28696.\n]
+    expected: FAIL
+
+  [X SNR (43.842664034730205 dB) is not greater than or equal to 65.737. Got 43.842664034730205.]
+    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/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
new file mode 100644
index 00000000000..663a1f8fa30
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
@@ -0,0 +1,5 @@
+[018.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, javascript:]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8..00000000000
--- a/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 96cc4f1703a..738c98d0796 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -187157,6 +187157,71 @@
         {}
        ]
       ],
+      "full-width-leading-spaces-001.html": [
+       "c23e4fdbc76e6f4c70cf936aaba2e7f5f51b734e",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/full-width-leading-spaces-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "full-width-leading-spaces-002.html": [
+       "610e5ae4632e6014c7de997a2a259ff4310dd96d",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-break-spaces-005-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "full-width-leading-spaces-003.html": [
+       "610e5ae4632e6014c7de997a2a259ff4310dd96d",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-break-spaces-005-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "full-width-leading-spaces-004.html": [
+       "eb7d24f042c4cd952c0fb4b8826abf70633fdaab",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-break-spaces-005-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "full-width-leading-spaces-005.html": [
+       "8fd86a900298c0e715cd7f65d469c726faf72240",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-break-spaces-005-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "line-edge-white-space-collapse-001.html": [
        "4e144e6c330191435f183936c2ab2437ec4f7609",
        [
@@ -188218,6 +188283,210 @@
         {}
        ]
       ],
+      "trailing-ideographic-space-005.html": [
+       "b33531bff998f46d8dfdba3a45757db03ff0cb62",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-006.html": [
+       "f5a8ab1dfbec8b494bb542e948e7c456112e29a3",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-003-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-007.html": [
+       "d58d5ba9cf21f1e606f3ebc32edb19629a9b677a",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-003-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-008.html": [
+       "50de162540f56c09cc859934c4d3c0c5d10b522d",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-003-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-009.html": [
+       "2a642bbc6fd26369087915d2cf6674737e9bba10",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-010.html": [
+       "eef3613edd0045592a7f6749724904faadb8f73d",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-003-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-011.html": [
+       "381d7a41b001a969615699b60752ff79c0f926ec",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-012.html": [
+       "2b73db18202d1b27feda9fb9fc9e779b943a82b6",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-013.html": [
+       "fa8195e4a8286d767f84de4762f5be69eb3c43b6",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-014.html": [
+       "8eab5924c57fe6ebaa7618980e3dd6d8bcccb3c4",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-015.html": [
+       "efcb2c8a0575a2204a6d03af60c5d95bc76d26f7",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "trailing-ideographic-space-016.html": [
+       "3e65785f39dc20049e0e16e09f95efedbef1edd5",
+       [
+        null,
+        [
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html",
+          "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "trailing-ogham-001.html": [
        "f687c7cdc377679a3eeb392254e6f68c883c504f",
        [
@@ -188869,13 +189138,17 @@
        ]
       ],
       "white-space-pre-wrap-trailing-spaces-004.html": [
-       "cde64415b7b074d0efe35ffa189b27f0b0327ded",
+       "d2fda889bc08aecb1e2f12ed3e34d3db5ea5ced1",
        [
         null,
         [
          [
           "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html",
           "=="
+         ],
+         [
+          "/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html",
+          "=="
          ]
         ],
         {}
@@ -258774,7 +259047,11 @@
     "critical-ch": {
      "resources": {
       "echo-critical-hint.py": [
-       "4e2577a231b8b49ab95da71b519a101120711448",
+       "8c06f79f1ad4e2b075cb67a72695e737ccc49207",
+       []
+      ],
+      "util.js": [
+       "7471d9022e48613f799283afdd7600ecdac6b15a",
        []
       ]
      }
@@ -319144,6 +319421,10 @@
         "30a4ffd303d55f6228b886aa658822975601967a",
         []
        ],
+       "full-width-leading-spaces-001-ref.html": [
+        "2b9cf1c3b27edbe44a1009366e47d245e4cb7a8b",
+        []
+       ],
        "line-edge-white-space-collapse-001-ref.html": [
         "02fa594255f00396f66e86837409cd579282f7de",
         []
@@ -319232,10 +319513,18 @@
         "a72e050031c5da7aad65eece88da65ace8293f52",
         []
        ],
+       "trailing-ideographic-space-011-ref.html": [
+        "a2efec249064cdd8ed2ee6888863c513ccb52da2",
+        []
+       ],
        "trailing-ideographic-space-alt-003-ref.html": [
         "9f579f29e0c897c744e1b06d5d2d60e85612f823",
         []
        ],
+       "trailing-ideographic-space-alt-011-ref.html": [
+        "03023f5359c62f71138696f8e90c6468de65b9d8",
+        []
+       ],
        "trailing-ogham-001-ref.html": [
         "1b6fddd30e2389f5cd3cba0f794d13c8a9ce98b5",
         []
@@ -319329,7 +319618,7 @@
         []
        ],
        "white-space-pre-wrap-trailing-spaces-004-ref.html": [
-        "0cbc7b231f0e3c7dd524ed94562663baf04667ed",
+        "6f79dfbeb3fd63a3b49d6c3831886b76ab1b5240",
         []
        ],
        "white-space-pre-wrap-trailing-spaces-012-ref.html": [
@@ -319348,6 +319637,10 @@
         "ffcabadeb3295072ef95c3e1e71ac27fa3706834",
         []
        ],
+       "white-space-pre-wrap-trailing-spaces-alt-004-ref.html": [
+        "de92f22e627bf844ac02aa9366f4e1dbcf0ca35b",
+        []
+       ],
        "white-space-pre-wrap-trailing-spaces-alt-012-ref.html": [
         "fc485c42b17ae9f4d469bc57b07bdff140a588be",
         []
@@ -348966,7 +349259,7 @@
    },
    "interfaces": {
     "CSP.idl": [
-     "43ec3e4e87d142e110fb901a355a8b9c2e47bf98",
+     "fd08a33499b19ea7af2512e55ace7ee36eefa409",
      []
     ],
     "DOM-Parsing.idl": [
@@ -349550,7 +349843,7 @@
      []
     ],
     "ua-client-hints.idl": [
-     "6e59d8e1fef5e34d94fe71a41f56a826a2c35981",
+     "09df2968aaaf925b0c1bb4c7d5df304ce8e1bf50",
      []
     ],
     "uievents.idl": [
@@ -356076,7 +356369,7 @@
      []
     ],
     "force-load-at-top.js": [
-     "223e3a4b5a066038135f4ae09f4a13f527f0ed7f",
+     "691168859ff2bb9e56af4f84036d7ff7be9026c5",
      []
     ],
     "navigate-back.html": [
@@ -358563,6 +358856,14 @@
      "8fb0a9b995d6289bb28582fa01e6bb092afa5dda",
      []
     ],
+    "declarative": {
+     "support": {
+      "declarative-child-frame.html": [
+       "10608b4875e0bd7d0169cf109b62b2b3612a8288",
+       []
+      ]
+     }
+    },
     "directionality-001-ref.html": [
      "7a2eaeb8681e860a52e5bf1268665fb896e4a950",
      []
@@ -391220,18 +391521,29 @@
     },
     "critical-ch": {
      "iframe.https.window.js": [
-      "87c68a347ce1d683852a17559d9202483871e7f2",
+      "f4dd295208fd4acddb084530cae772077004cab4",
       [
        "client-hints/critical-ch/iframe.https.window.html",
-       {}
+       {
+        "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ]
+        ]
+       }
       ]
      ],
      "mis-matched-count.https.window.js": [
-      "b0c8d875a86946971f547d4cd01d079e0de65ed3",
+      "54bd66789793babdc8aab812059d30aeaa21ba11",
       [
        "client-hints/critical-ch/mis-matched-count.https.window.html",
        {
         "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ],
          [
           "script",
           "/common/utils.js"
@@ -391241,32 +391553,57 @@
       ]
      ],
      "mis-matched.https.window.js": [
-      "fcfd5412c009efc824d23a691f0c0857a35a254a",
+      "9476640b3513d36850d26ab2154e0bd07db5d77d",
       [
        "client-hints/critical-ch/mis-matched.https.window.html",
-       {}
+       {
+        "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ]
+        ]
+       }
       ]
      ],
      "navigation.https.window.js": [
-      "831987eef1b515da10619d93237b2689d22c2ae8",
+      "549b32144321381ce48f4eb7ea95c0a1f31bc404",
       [
        "client-hints/critical-ch/navigation.https.window.html",
-       {}
+       {
+        "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ]
+        ]
+       }
       ]
      ],
      "non-secure.http.window.js": [
-      "46c00ffdb66da314bbeec7804795566d3217712e",
+      "cdd79243982a46d60177e8721479e9eab111e88c",
       [
        "client-hints/critical-ch/non-secure.http.window.html",
-       {}
+       {
+        "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ]
+        ]
+       }
       ]
      ],
      "request-count.https.window.js": [
-      "36c0ef8b99349e8ded23b80c3efc0894071adba0",
+      "b337340509354c3268d6fea2d935de4400ace70d",
       [
        "client-hints/critical-ch/request-count.https.window.html",
        {
         "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ],
          [
           "script",
           "/common/utils.js"
@@ -391276,9 +391613,27 @@
       ]
      ],
      "subresource.https.window.js": [
-      "494933500946aba2620c479857f99e091d4e3376",
+      "f8112b628d0f263959fd2a7dd8dfa066920f3514",
       [
        "client-hints/critical-ch/subresource.https.window.html",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "resources/util.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ]
+        ]
+       }
+      ]
+     ],
+     "unsafe-method.https.window.js": [
+      "0eca0eb8e9aea1c066d56b685f23ffadf3a6754f",
+      [
+       "client-hints/critical-ch/unsafe-method.https.window.html",
        {}
       ]
      ]
@@ -402146,6 +402501,13 @@
        {}
       ]
      ],
+     "flex-aspect-ratio-img-row-013.html": [
+      "07b4302bfb1d58cb9ec3cc9b706dd0df05e72bc5",
+      [
+       null,
+       {}
+      ]
+     ],
      "flex-basis-009.html": [
       "3e2026958fdd899349126ebe4778fb62a692d631",
       [
@@ -416548,8 +416910,15 @@
        ]
       ]
      },
-     "preserve-3d-flat-grouping-properties.tentative.html": [
-      "2d4bb4854976b489c8aeff6c0fc0dcaf5884b1dd",
+     "preserve-3d-flat-grouping-properties-containing-block.tentative.html": [
+      "e30607c1197ddc13b76daf768686be13a9351a05",
+      [
+       null,
+       {}
+      ]
+     ],
+     "preserve-3d-flat-grouping-properties.html": [
+      "9d2423f98819dc11a5369e449f9e6d1de0bfad00",
       [
        null,
        {}
@@ -483981,7 +484350,7 @@
         ]
        ],
        "input-valueasnumber.html": [
-        "321c981c74d2293694fecf18284126b089aca1c2",
+        "1af75eafa3e3743435e19a65cb1c30b67d1504dd",
         [
          null,
          {}
@@ -495068,6 +495437,13 @@
       {}
      ]
     ],
+    "fixed-position-move.html": [
+     "877c2ba4b34615c41a5b21dbf114df69eef04352",
+     [
+      null,
+      {}
+     ]
+    ],
     "fully-clipped-visual-rect.html": [
      "bfd74a2407e2d91cdb2a13b86945b040aeb6dcca",
      [
@@ -495253,6 +495629,20 @@
       {}
      ]
     ],
+    "sticky-descendant-move.html": [
+     "afab89592de311f000c461415e77b83227780423",
+     [
+      null,
+      {}
+     ]
+    ],
+    "sticky-layout-no-change.html": [
+     "8f3b2cf37382766fae97acd4f8059365f2479bae",
+     [
+      null,
+      {}
+     ]
+    ],
     "supported-layout-type.html": [
      "3ba209f50a427965b651c92701a62f9006b8a2b1",
      [
@@ -522962,14 +523352,21 @@
       ]
      ],
      "declarative-shadow-dom-attachment.tentative.html": [
-      "b78902c4b59dc26ac819fbe24809621201fdc0ca",
+      "73b43829f1a093140a83b92e383e9a02ad3b4a6f",
       [
        null,
        {}
       ]
      ],
      "declarative-shadow-dom-basic.tentative.html": [
-      "92e667fdbcf9c3828e97732795af9d682c59645b",
+      "f17e304fe75995b492a23dfdf082a0f5e5bc48c6",
+      [
+       null,
+       {}
+      ]
+     ],
+     "declarative-shadow-dom-opt-in.tentative.html": [
+      "b314adb85c40097c17d838fe1645110df39059e7",
       [
        null,
        {}
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
new file mode 100644
index 00000000000..f64b45fea6b
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[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/flex-aspect-ratio-img-row-013.html.ini b/tests/wpt/metadata/css/css-flexbox/flex-aspect-ratio-img-row-013.html.ini
new file mode 100644
index 00000000000..eba48c8914e
--- /dev/null
+++ b/tests/wpt/metadata/css/css-flexbox/flex-aspect-ratio-img-row-013.html.ini
@@ -0,0 +1,10 @@
+[flex-aspect-ratio-img-row-013.html]
+  [img 1]
+    expected: FAIL
+
+  [img 2]
+    expected: FAIL
+
+  [img 3]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-011.html.ini b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-011.html.ini
new file mode 100644
index 00000000000..ddde7788d61
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-011.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-011.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-013.html.ini b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-013.html.ini
new file mode 100644
index 00000000000..abfa0f1c4e1
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-013.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-013.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-015.html.ini b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-015.html.ini
new file mode 100644
index 00000000000..fdca1f9bf5a
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-015.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-015.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-016.html.ini b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-016.html.ini
new file mode 100644
index 00000000000..9af0921a3c7
--- /dev/null
+++ b/tests/wpt/metadata/css/css-text/white-space/trailing-ideographic-space-016.html.ini
@@ -0,0 +1,2 @@
+[trailing-ideographic-space-016.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini b/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini
new file mode 100644
index 00000000000..e7b72ff95e6
--- /dev/null
+++ b/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html.ini
@@ -0,0 +1,2 @@
+[preserve-3d-flat-grouping-properties-containing-block.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini b/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini
new file mode 100644
index 00000000000..9a64545af67
--- /dev/null
+++ b/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.html.ini
@@ -0,0 +1,2 @@
+[preserve-3d-flat-grouping-properties.html]
+  expected: ERROR
diff --git a/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html.ini b/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html.ini
deleted file mode 100644
index 5590d6ddc37..00000000000
--- a/tests/wpt/metadata/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[preserve-3d-flat-grouping-properties.tentative.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e274..00000000000
--- a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 4e25a2f5ad3..043e427ca8f 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,21 +312,21 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" 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>: combined response Content-Type: text/html */*]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 258fe374697..5c001592859 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,6 +56,6 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript ]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 369bf4d4fa4..30e1b851fd4 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +11,3 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
-  [Content-Type-Options%3A%20nosniff]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 00000000000..75d75b4cda2
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
new file mode 100644
index 00000000000..51f8272a6de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_3.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini b/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
new file mode 100644
index 00000000000..735a9a75a2a
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
@@ -0,0 +1,2 @@
+[cross-origin-objects-on-new-window.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 16fa2c5cfc1..00000000000
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    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 442db3cb549..2532dceabac 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
@@ -1,4 +1,5 @@
 [embedded-opener-remove-frame.html]
+  expected: CRASH
   [opener and "removed" embedded documents]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index c6f45be1eb2..e63fe7c263e 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/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..9df1ac56f2a 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 +1,6 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index d43f38b40cd..45d8be1c898 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index e440b1e38c6..dc856a3d5a3 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
new file mode 100644
index 00000000000..633a99517d3
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-2.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-2.html]
+  [preventDefault should allow onclick submit() to succeed]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
new file mode 100644
index 00000000000..9f416703229
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit-3.html.ini
@@ -0,0 +1,4 @@
+[form-double-submit-3.html]
+  [<button> should have the same double-submit protection as <input type=submit>]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
deleted file mode 100644
index b193c33c2b6..00000000000
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-double-submit.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[form-double-submit.html]
-  [default submit action should supersede onclick submit()]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index d6bb751ddc2..a057142bbc5 100644
--- a/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/metadata/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -12,3 +12,6 @@
   [Check that rel=noopener with target=_parent does a normal load]
     expected: FAIL
 
+  [Check that rel=noopener with target=_self does a normal load]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
new file mode 100644
index 00000000000..59a54fe88e4
--- /dev/null
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
@@ -0,0 +1,4 @@
+[module-delayed.html]
+  [async document.write in a module]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 0cef5158fae..01f7b72cbe7 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -4,3 +4,6 @@
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
 
+  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
+    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 901a5da21ca..fd75fea87a4 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
@@ -473,3 +473,9 @@
   [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\]\t2.7146387523941948e-32\t9.3139332532882690e-1\t9.3139332532882690e-1\t1.0000000000000000e+0\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 9.3139332532882690e-1 at index of 28696.\n\tMax RelError of 1.0000000000000000e+0 at index of 28696.\n]
     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\]\t2.1021796856075525e-3\t9.3139332532882690e-1\t9.2929114564321935e-1\t9.9774297321181105e-1\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 9.2929114564321935e-1 at index of 28696.\n\tMax RelError of 9.9774297321181105e-1 at index of 28696.\n]
+    expected: FAIL
+
+  [X SNR (43.842664034730205 dB) is not greater than or equal to 65.737. Got 43.842664034730205.]
+    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/017.html.ini b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
new file mode 100644
index 00000000000..064cf47545b
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
@@ -0,0 +1,5 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/webmessaging/without-ports/018.html.ini b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
new file mode 100644
index 00000000000..663a1f8fa30
--- /dev/null
+++ b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
@@ -0,0 +1,5 @@
+[018.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, javascript:]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8..00000000000
--- a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/iframe.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/iframe.https.window.js
index 87c68a347ce..f4dd295208f 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/iframe.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/iframe.https.window.js
@@ -1,9 +1,8 @@
+// META: script=resources/util.js
+
 async_test((t) => {
   var iframe = document.createElement("iframe");
-  iframe.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(iframe.contentDocument.body.textContent, "FAIL");});
-    t.done();
-  });
-  iframe.src = "resources/echo-critical-hint.py";
+  iframe.src = ECHO_URL;
   document.body.appendChild(iframe);
+  iframe.contentWindow.addEventListener('message', message_listener(t, "FAIL"));
 }, "Critical-CH iframe");
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched-count.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched-count.https.window.js
index b0c8d875a86..54bd6678979 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched-count.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched-count.https.window.js
@@ -1,10 +1,4 @@
+// META: script=resources/util.js
 // META: script=/common/utils.js
 
-async_test((t) => {
-  var popup_window = window.open("resources/echo-critical-hint.py?mismatch=true&token="+token());
-  assert_not_equals(popup_window, null, "Popup windows not allowed?");
-  popup_window.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(popup_window.document.body.textContent, "1")});
-    t.done();
-  });
-}, "Critical-CH navigation")
+async_test(make_message_test(ECHO_URL+"?mismatch=true&token="+token(), "1"), "Critical-CH no restart on mismatched hints")
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched.https.window.js
index fcfd5412c00..9476640b351 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/mis-matched.https.window.js
@@ -1,8 +1,3 @@
-async_test((t) => {
-  var popup_window = window.open("resources/echo-critical-hint.py?mismatch=true");
-  assert_not_equals(popup_window, null, "Popup windows not allowed?");
-  popup_window.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(popup_window.document.body.textContent, "FAIL")});
-    t.done();
-  });
-}, "Critical-CH navigation")
+// META: script=resources/util.js
+
+async_test(make_message_test(ECHO_URL+"?mismatch=true", "FAIL"), "Critical-CH Mis-matched hints")
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/navigation.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/navigation.https.window.js
index 831987eef1b..549b3214432 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/navigation.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/navigation.https.window.js
@@ -1,8 +1,3 @@
-async_test((t) => {
-  var popup_window = window.open("resources/echo-critical-hint.py");
-  assert_not_equals(popup_window, null, "Popup windows not allowed?");
-  popup_window.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(popup_window.document.body.textContent, "PASS")});
-    t.done();
-  });
-}, "Critical-CH navigation")
+// META: script=resources/util.js
+
+async_test(make_message_test(ECHO_URL, "PASS"), "Critical-CH navigation")
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/non-secure.http.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/non-secure.http.window.js
index 46c00ffdb66..cdd79243982 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/non-secure.http.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/non-secure.http.window.js
@@ -1,8 +1,3 @@
-async_test((t) => {
-  var popup_window = window.open("resources/echo-critical-hint.py");
-  assert_not_equals(popup_window, null, "Popup windows not allowed?");
-  popup_window.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(popup_window.document.body.textContent, "FAIL")});
-    t.done();
-  });
-}, "Critical-CH non-secure navigation")
+// META: script=resources/util.js
+
+async_test(make_message_test(ECHO_URL, "FAIL"), "Critical-CH navigation non-secure")
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/request-count.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/request-count.https.window.js
index 36c0ef8b993..b3373405093 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/request-count.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/request-count.https.window.js
@@ -1,10 +1,4 @@
+// META: script=resources/util.js
 // META: script=/common/utils.js
 
-async_test((t) => {
-  var popup_window = window.open("resources/echo-critical-hint.py?token="+token());
-  assert_not_equals(popup_window, null, "Popup windows not allowed?");
-  popup_window.addEventListener('load', (e) => {
-    t.step(()=>{assert_equals(popup_window.document.body.textContent, "2")});
-    t.done();
-  });
-}, "Critical-CH navigation")
+async_test(make_message_test(ECHO_URL+"?token="+token(), "2"), "Critical-CH navigation restart")
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/echo-critical-hint.py b/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/echo-critical-hint.py
index 4e2577a231b..8c06f79f1ad 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/echo-critical-hint.py
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/echo-critical-hint.py
@@ -40,4 +40,4 @@ def main(request, response):
     if b"viewport-width" in request.headers:
       result = "MISMATCH"
 
-    response.content = result
+    response.content = "<script>window.postMessage('{0}', '*')</script>".format(result)
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/util.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/util.js
new file mode 100644
index 00000000000..7471d9022e4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/resources/util.js
@@ -0,0 +1,15 @@
+ECHO_URL = "resources/echo-critical-hint.py"
+
+message_listener = (t, message) =>
+  (e) => {
+    t.step(()=>{assert_equals(e.data, message)});
+    t.done();
+  }
+
+make_message_test = (url, message) =>
+  (t) => {
+    popup_window = window.open("/common/blank.html");
+    assert_not_equals(popup_window, null, "Popup windows not allowed?");
+    popup_window.addEventListener('message', message_listener(t, message));
+    popup_window.location = url;
+  }
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/subresource.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/subresource.https.window.js
index 49493350094..f8112b628d0 100644
--- a/tests/wpt/web-platform-tests/client-hints/critical-ch/subresource.https.window.js
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/subresource.https.window.js
@@ -1,7 +1,10 @@
+// META: script=resources/util.js
+// META: script=/common/utils.js
+
 promise_test(() =>
   fetch("resources/echo-critical-hint.py")
       .then((r) => r.text())
       .then((r) => {
-        assert_equals(r, "FAIL");
+        assert_true(r.includes("FAIL"));
       })
-, "Critical-CH");
+, "Critical-CH subresource fetch");
diff --git a/tests/wpt/web-platform-tests/client-hints/critical-ch/unsafe-method.https.window.js b/tests/wpt/web-platform-tests/client-hints/critical-ch/unsafe-method.https.window.js
new file mode 100644
index 00000000000..0eca0eb8e9a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/critical-ch/unsafe-method.https.window.js
@@ -0,0 +1,23 @@
+async_test((t) => {
+  // This test requires a navigation with a non-safe (i.e. non-GET) HTTP
+  // response, which the Critical-CH spec says to ignore. The most
+  // "straight-forward" way to do this in JS is by making a form with an
+  // unsafe method (e.g. POST) method and submit it.
+
+  // Build the form DOM element
+  var form = document.createElement("form");
+  form.setAttribute("method", "post");
+  form.setAttribute("action", "resources/echo-critical-hint.py");
+  form.setAttribute("target", "popup"); //don't navigate away from the page running the test...
+  document.body.appendChild(form);
+
+  var popup_window = window.open("/common/blank.html", "popup");
+  assert_not_equals(popup_window, null, "Popup windows not allowed?");
+
+  popup_window.addEventListener('message', (e) => {
+    t.step(()=>{assert_equals(e.data, "FAIL")});
+    t.done();
+  });
+
+  form.submit();
+}, "Critical-CH unsafe method")
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/flex-aspect-ratio-img-row-013.html b/tests/wpt/web-platform-tests/css/css-flexbox/flex-aspect-ratio-img-row-013.html
new file mode 100644
index 00000000000..07b4302bfb1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/flex-aspect-ratio-img-row-013.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#transferred-size-suggestion">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5663">
+<meta name="assert" content="Transferred size suggestion can get its cross size from stretching." />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body onload="checkLayout('img')">
+<p>
+Pass condition is 3 green 100x100 squares.
+</p>
+
+<p>
+Firefox 84a1 passes. Chrome 87 fails them all by making the green rectangles be 200x100.
+</p>
+
+<p>Transferred size suggestion is the stretched 100px:</p>
+<div style="display: flex; width: 0; height: 100px;">
+  <img src="support/200x200-green.png" data-expected-height=100 data-expected-width=100>
+</div>
+
+<p>Have to subtract the margin from the stretched height to get the transferred size suggestion:</p>
+<div style="display: flex; width: 0; height: 120px;">
+  <img src="support/200x200-green.png" style="margin-bottom: 20px" data-expected-height=100 data-expected-width=100>
+</div>
+
+<p>Stretched transferred size suggestion has to obey min-height:</p>
+<div style="display: flex; width: 0; height: 50px;">
+  <img src="support/200x200-green.png" style="min-height: 100px;" data-expected-height=100 data-expected-width=100>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-001.html b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-001.html
new file mode 100644
index 00000000000..c23e4fdbc76
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/full-width-leading-spaces-001-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) sequence at the beginning of the line must not be collapsed.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 20px/1 Ahem; }
+.test {
+    width: 5em;
+    color: green;
+    background: green;
+}
+.ref {
+    position: absolute;
+    z-index: -1;
+    color: red;
+}
+</style>
+
+<p>Test passes if the characters below are arranged in a green rectangle and if there is no red.
+<div class="ref">XXXXX</div>
+<div class="test">&#x3000;&#x3000;&#x3000;XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-002.html b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-002.html
new file mode 100644
index 00000000000..610e5ae4632
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-002.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/white-space-break-spaces-005-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) sequence at the beginning of the line must not be collapsed.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 50px/1 Ahem; }
+.test {
+    width: 2em;
+    color: green;
+    background: green;
+}
+.ref {
+    position: absolute;
+    z-index: -1;
+    color: red;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="ref">XX<br>XX</div>
+<div class="test">&#x3000;&#x3000;XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-003.html b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-003.html
new file mode 100644
index 00000000000..610e5ae4632
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-003.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/white-space-break-spaces-005-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) sequence at the beginning of the line must not be collapsed.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 50px/1 Ahem; }
+.test {
+    width: 2em;
+    color: green;
+    background: green;
+}
+.ref {
+    position: absolute;
+    z-index: -1;
+    color: red;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="ref">XX<br>XX</div>
+<div class="test">&#x3000;&#x3000;XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-004.html b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-004.html
new file mode 100644
index 00000000000..eb7d24f042c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-004.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/white-space-break-spaces-005-ref.html">
+<meta name="assert" content="Leading ideographic space sequences must account for intrinsic size.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+.ref {
+    width: 100px;
+    height: 100px;
+    background: red;
+}
+.test {
+    width: min-content;
+    font-size: 100px;
+    line-height: 1;
+    background: green;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="ref"><div class="test">&#x03000;</div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-005.html b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-005.html
new file mode 100644
index 00000000000..8fd86a90029
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/full-width-leading-spaces-005.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/white-space-break-spaces-005-ref.html">
+<meta name="assert" content="There is a breaking opportunity at the end of a leading ideographic space (U+3000) sequence.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 50px/1 Ahem; }
+.test {
+    width: 2em;
+    color: green;
+    background: green;
+}
+.ref {
+    position: absolute;
+    z-index: -1;
+    color: red;
+}
+</style>
+
+<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+<div class="ref">XX<br>XX</div>
+<div class="test">&#x3000;&#x3000;XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/full-width-leading-spaces-001-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/full-width-leading-spaces-001-ref.html
new file mode 100644
index 00000000000..2b9cf1c3b27
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/full-width-leading-spaces-001-ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS test reference</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<p>Test passes if the characters below are arranged in a green rectangle and if there is no red.
+<div style="width: 100px; height: 20px; background: green"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html
new file mode 100644
index 00000000000..a2efec24906
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-011-ref.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS test reference</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+    font: 20px/1 Ahem;
+    white-space: pre;
+}
+span { background: blue; }
+</style>
+
+<p>Test passes if the characters below are arranged in a single line and if there is a blue square at the end of the first line.
+<div>X X<span> </span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html
new file mode 100644
index 00000000000..03023f5359c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/trailing-ideographic-space-alt-011-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS test reference</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div { font: 20px/1 Ahem; }
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>X X<span>X</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html
index 0cbc7b231f0..6f79dfbeb3f 100644
--- a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-004-ref.html
@@ -9,6 +9,7 @@ div {
   font: 25px/1 Ahem;
   color: green;
 }
+span { color: blue; }
 </style>
 
 <p>This test passes if there is a green square and no red.
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html
new file mode 100644
index 00000000000..de92f22e627
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>CSS test Reference</title>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com" />
+
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+div {
+  font: 25px/1 Ahem;
+  color: green;
+}
+span { color: blue; }
+</style>
+
+<p>This test passes if there is a green square and no red.
+
+<div>XX<span>X</span><br>XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-005.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-005.html
new file mode 100644
index 00000000000..b33531bff99
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-005.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequences of spaces and ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-normal">
+<link rel="match" href="reference/trailing-ideographic-space-004-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An sequence ideographic space (U+3000) and regular spaces at the end of the line must hang unconditionally .">
+<style>
+div {
+  width: 2.5em;
+  white-space: normal;
+}
+span { background: blue; } /* If the spaces are removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;&#x3000; &#x3000; &#x3000;</span>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole space will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-006.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-006.html
new file mode 100644
index 00000000000..f5a8ab1dfbe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-006.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequences of spaces and ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-normal">
+<link rel="match" href="reference/trailing-ideographic-space-003-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) at the end of the line must unconditionally hang.">
+<style>
+div {
+  width: 2.5em;
+  white-space: normal;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;</span>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole sequence of preserved spaces will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-007.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-007.html
new file mode 100644
index 00000000000..d58d5ba9cf2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-007.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequences of spaces and ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-nowrap">
+<link rel="match" href="reference/trailing-ideographic-space-003-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) at the end of the line must unconditionally hang.">
+<style>
+div {
+  width: 2.5em;
+  white-space: nowrap;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;</span><br>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole sequence of preserved spaces will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-008.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-008.html
new file mode 100644
index 00000000000..50de162540f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-008.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequences of spaces and ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-line">
+<link rel="match" href="reference/trailing-ideographic-space-003-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An ideographic space (U+3000) at the end of the line must unconditionally hang.">
+<style>
+div {
+  width: 2.5em;
+  white-space: pre-line;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;</span>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole sequence of preserved spaces will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-009.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-009.html
new file mode 100644
index 00000000000..2a642bbc6fd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-009.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequences of spaces and ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-nowrap">
+<link rel="match" href="reference/trailing-ideographic-space-004-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An sequence ideographic space (U+3000) and regular spaces at the end of the line must hang unconditionally .">
+<style>
+div {
+  width: 2.5em;
+  white-space: nowrap;
+}
+span { background: blue; } /* If the spaces are removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;&#x3000; &#x3000; &#x3000;</span><br>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole space will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-010.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-010.html
new file mode 100644
index 00000000000..eef3613edd0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-010.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: sequence of ideographic spaces at the end of line must hang</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com"
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-line">
+<link rel="match" href="reference/trailing-ideographic-space-004-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-003-ref.html">
+<meta name="assert" content="An sequence ideographic space (U+3000) and regular spaces at the end of the line must hang unconditionally .">
+<style>
+div {
+  width: 2.5em;
+  white-space: pre-line;
+}
+span { background: blue; } /* If the spaces are removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a square and if there is a blue rectangle at the end of the first line.
+<div>ああ<span>&#x3000;&#x3000; &#x3000; &#x3000;</span>ああ</div>
+
+<!--
+We're using a 2.5em width and two references, instead of 2em and just the first one,
+because in addition to requiring the spaces to hang,
+the spec allows, but does not require, browsers to visually collapse the advance widths of characters that overflow.
+In browsers that don't do that, the whole space will be visible, and the first ref will be matched.
+In browsers that do, only the first 0.5em worth of space will be preserved, and the second ref will match.
+-->
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-011.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-011.html
new file mode 100644
index 00000000000..381d7a41b00
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-011.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/trailing-ideographic-space-011-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-011-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+    font: 20px/1 Ahem;
+    width: 3ch;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a single line and if there is a blue square at the end of the first line.
+<div>X&#x03000;<span>X&#x03000;</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-012.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-012.html
new file mode 100644
index 00000000000..2b73db18202
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-012.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-004-ref.html">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+  font: 25px/1 Ahem;
+  color: green;
+  background: red;
+
+  width: 2ch;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>This test passes if there is a green square and no red.
+<div>XX<span>&#x03000;</span>XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-013.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-013.html
new file mode 100644
index 00000000000..fa8195e4a82
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-013.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" title="5.5. Overflow Wrapping: the overflow-wrap/word-wrap property" href="https://drafts.csswg.org/css-text-3/#overflow-wrap-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-break-word">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-004-ref.html">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang, despite the use of overflow-wrap: break-word.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+  font: 25px/1 Ahem;
+  color: green;
+  background: red;
+
+  width: 2ch;
+  overflow-wrap: break-word;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>This test passes if there is a green square and no red.
+<div>XX<span>&#x03000;</span>XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-014.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-014.html
new file mode 100644
index 00000000000..8eab5924c57
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-014.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" title="5.5. Overflow Wrapping: the overflow-wrap/word-wrap property" href="https://drafts.csswg.org/css-text-3/#overflow-wrap-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-anywhere">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-004-ref.html">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang, despite the use of overflow-wrap: anywhere.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+  font: 25px/1 Ahem;
+  color: green;
+  background: red;
+
+  width: 2ch;
+  overflow-wrap: anywhere;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>This test passes if there is a green square and no red.
+<div>XX<span>&#x03000;</span>XX</div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-015.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-015.html
new file mode 100644
index 00000000000..efcb2c8a057
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-015.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" title="5.5. Overflow Wrapping: the overflow-wrap/word-wrap property" href="https://drafts.csswg.org/css-text-3/#overflow-wrap-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-anywhere">
+<link rel="match" href="reference/trailing-ideographic-space-011-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-011-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang, despite the use of overflow-wrap: anywhere.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+    font: 20px/1 Ahem;
+    width: 3ch;
+
+    overflow-wrap: anywhere;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a single line and if there is a blue square at the end of the first line.
+<div>X&#x03000;<span>X&#x03000;</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-016.html b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-016.html
new file mode 100644
index 00000000000..3e65785f39d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/trailing-ideographic-space-016.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text level 3 Test: handling leading ideographic space sequence</title>
+<link rel="author" title="Javier Fernandez Garcia-Boente" href="mailto:jfernandez@igalia.com">
+<link rel="help" title="3. White Space and Wrapping: the white-space property" href="https://drafts.csswg.org/css-text-3/#white-space-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="help" title="5.5. Overflow Wrapping: the overflow-wrap/word-wrap property" href="https://drafts.csswg.org/css-text-3/#overflow-wrap-property">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-anywhere">
+<link rel="match" href="reference/trailing-ideographic-space-011-ref.html">
+<link rel="match" href="reference/trailing-ideographic-space-alt-011-ref.html">
+<meta name="assert" content="Trailing ideographic spaces should hang, despite the use of overflow-wrap: break-word.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+div {
+    font: 20px/1 Ahem;
+    width: 3ch;
+
+    overflow-wrap: break-word;
+}
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
+</style>
+
+<p>Test passes if the characters below are arranged in a single line and if there is a blue square at the end of the first line.
+<div>X&#x03000;<span>X&#x03000;</span></div>
diff --git a/tests/wpt/web-platform-tests/css/css-text/white-space/white-space-pre-wrap-trailing-spaces-004.html b/tests/wpt/web-platform-tests/css/css-text/white-space/white-space-pre-wrap-trailing-spaces-004.html
index cde64415b7b..d2fda889bc0 100644
--- a/tests/wpt/web-platform-tests/css/css-text/white-space/white-space-pre-wrap-trailing-spaces-004.html
+++ b/tests/wpt/web-platform-tests/css/css-text/white-space/white-space-pre-wrap-trailing-spaces-004.html
@@ -6,6 +6,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
 <link rel="help" title="4.1.3. Phase II: Trimming and Positioning" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
 <link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-004-ref.html">
+<link rel="match" href="reference/white-space-pre-wrap-trailing-spaces-alt-004-ref.html">
 <meta name="assert" content="Preserved white space at the end of a soft-wrapped line is hanged when white-space is pre-wrap.">
 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
 <style>
@@ -17,6 +18,7 @@ div {
   width: 2ch;
   white-space: pre-wrap;
 }
+span { background: blue; } /* If the space is removed instead of hanging, there will be no blue box*/
 </style>
 
 <p>This test passes if there is a green square and no red.
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html b/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html
new file mode 100644
index 00000000000..e30607c1197
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties-containing-block.tentative.html
@@ -0,0 +1,43 @@
+<!doctype HTML>
+<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+  div {
+    width: 200px;
+    height: 200px;
+  }
+  .parent {
+    transform-style: preserve-3d;
+    transform: rotateY(45deg)
+  }
+
+  .child {
+    transform: rotateY(45deg);
+    background: lightblue
+  }
+</style>
+
+<div id=parentWithGrouping style="transform-style: preserve-3d; overflow: hidden">
+  <div id=absoluteUnderGrouping style="position: absolute">
+  </div>
+</div>
+
+<div id=parentWithoutGrouping style="transform-style: preserve-3d">
+  <div id=absoluteNotUnderGrouping style="position: absolute">
+  </div>
+</div>
+
+<script>
+  nonflatWidth = nonflat.getBoundingClientRect().width;
+
+  test(function() {
+    assert_equals(absoluteUnderGrouping.offsetParent, parentWithGrouping);
+  }, "Preserve-3d element with a grouping property still a containing block");
+
+  test(function() {
+    assert_equals(absoluteNotUnderGrouping.offsetParent, parentWithoutGrouping);
+  }, "Preserve-3d element without a grouping property still a containing block");
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html b/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.html
similarity index 90%
rename from tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html
rename to tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.html
index 2d4bb485497..9d2423f9881 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/preserve-3d-flat-grouping-properties.html
@@ -113,12 +113,4 @@
   test(function() {
     assert_not_equals(mask.getBoundingClientRect().width, nonflatWidth);
   }, "Preserve-3d element flattened due to mask");
-
-  test(function() {
-    assert_equals(absoluteUnderGrouping.offsetParent, parentWithGrouping);
-  }, "Preserve-3d element with a grouping property still a containing block");
-
-  test(function() {
-    assert_equals(absoluteNotUnderGrouping.offsetParent, parentWithoutGrouping);
-  }, "Preserve-3d element without a grouping property still a containing block");
 </script>
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/input-valueasnumber.html b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/input-valueasnumber.html
index 321c981c74d..1af75eafa3e 100644
--- a/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/input-valueasnumber.html
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/the-input-element/input-valueasnumber.html
@@ -120,11 +120,16 @@
    testValueAsNumberGetter("number", numberInput, [
      ["", NaN],
      ["123", 123],
-     ["123.456", 123.456]
+     ["123.456", 123.456],
+     ["1e3", 1000],
+     ["1e", NaN],
+     ["-123", -123]
    ]);
    testValueAsNumberSetter("number", numberInput, [
      [123, "123"],
-     [123.456, "123.456"]
+     [123.456, "123.456"],
+     [1e3, "1000"],
+     [-123, "-123"]
    ]);
 
    const rangeInput = document.getElementById("input_range");
diff --git a/tests/wpt/web-platform-tests/interfaces/CSP.idl b/tests/wpt/web-platform-tests/interfaces/CSP.idl
index 43ec3e4e87d..fd08a33499b 100644
--- a/tests/wpt/web-platform-tests/interfaces/CSP.idl
+++ b/tests/wpt/web-platform-tests/interfaces/CSP.idl
@@ -3,6 +3,7 @@
 // (https://github.com/w3c/webref)
 // Source: Content Security Policy Level 3 (https://w3c.github.io/webappsec-csp/)
 
+[Exposed=Window]
 interface CSPViolationReportBody : ReportBody {
   readonly attribute USVString documentURL;
   readonly attribute USVString? referrer;
@@ -21,9 +22,9 @@ enum SecurityPolicyViolationEventDisposition {
   "enforce", "report"
 };
 
-[Constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict),
- Exposed=(Window,Worker)]
+[Exposed=(Window,Worker)]
 interface SecurityPolicyViolationEvent : Event {
+    constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict = {});
     readonly    attribute USVString      documentURL;
     readonly    attribute USVString      documentURI; // historical alias of documentURL
     readonly    attribute USVString      referrer;
diff --git a/tests/wpt/web-platform-tests/interfaces/ua-client-hints.idl b/tests/wpt/web-platform-tests/interfaces/ua-client-hints.idl
index 6e59d8e1fef..09df2968aaa 100644
--- a/tests/wpt/web-platform-tests/interfaces/ua-client-hints.idl
+++ b/tests/wpt/web-platform-tests/interfaces/ua-client-hints.idl
@@ -10,7 +10,6 @@ dictionary NavigatorUABrandVersion {
 
 dictionary UADataValues {
   DOMString platform;
-
   DOMString platformVersion;
   DOMString architecture;
   DOMString model;
diff --git a/tests/wpt/web-platform-tests/layout-instability/fixed-position-move.html b/tests/wpt/web-platform-tests/layout-instability/fixed-position-move.html
new file mode 100644
index 00000000000..877c2ba4b34
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/fixed-position-move.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Layout Instability: movement of fixed position</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<div id="target" style="position: fixed; top: 100px; width: 300px; height: 200px; background: yellow">
+</div>
+<script>
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Modify the position of the div.
+  target.style.top = '200px';
+
+  const expectedScore = computeExpectedScore(300 * (200 + 100), 100);
+
+  // Observer fires after the frame is painted.
+  assert_equals(watcher.score, 0);
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, 'Movement of fixed position');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/sticky-descendant-move.html b/tests/wpt/web-platform-tests/layout-instability/sticky-descendant-move.html
new file mode 100644
index 00000000000..afab89592de
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/sticky-descendant-move.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>Layout Instability: movement of descendant of sticky positioned</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<div style="position: sticky; width: 400px; height: 300px; top: 0">
+  <div id="child" style="position: relative; width: 300px; height: 200px; background: yellow"></div>
+</div>
+<script>
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // Modify the position of the div.
+  const child = document.querySelector("#child");
+  child.style.top = '100px';
+
+  const expectedScore = computeExpectedScore(300 * (200 + 100), 100);
+
+  // Observer fires after the frame is painted.
+  assert_equals(watcher.score, 0);
+  await watcher.promise;
+  assert_equals(watcher.score, expectedScore);
+}, 'Movement of descendant of sticky positioned.');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/layout-instability/sticky-layout-no-change.html b/tests/wpt/web-platform-tests/layout-instability/sticky-layout-no-change.html
new file mode 100644
index 00000000000..8f3b2cf3738
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/sticky-layout-no-change.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<title>Layout Instability: sticky positioned layout no change</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/util.js"></script>
+<div style="height: 3000px"></div>
+<div id="sticky" style="position: sticky; width: 200px; height: 300px; bottom: 0">
+  <div style="will-change: transform; height: 3000px; background: yellow"></div>
+</div>
+<script>
+
+promise_test(async () => {
+  const watcher = new ScoreWatcher;
+
+  // Wait for the initial render to complete.
+  await waitForAnimationFrames(2);
+
+  // This doesn't change layout because the sticky element sticks to the bottom.
+  sticky.style.marginTop = "-1000px";
+
+  await waitForAnimationFrames(3);
+  assert_equals(watcher.score, 0);
+}, 'Sticky layout no change.');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/scroll-to-text-fragment/force-load-at-top.js b/tests/wpt/web-platform-tests/scroll-to-text-fragment/force-load-at-top.js
index 223e3a4b5a0..691168859ff 100644
--- a/tests/wpt/web-platform-tests/scroll-to-text-fragment/force-load-at-top.js
+++ b/tests/wpt/web-platform-tests/scroll-to-text-fragment/force-load-at-top.js
@@ -14,7 +14,7 @@ function checkScroll() {
   });
 }
 
-window.addEventListener('load', () => {
+window.addEventListener('pageshow', () => {
   if (location.hash == "#history") {
     // This is the "history" test - on the first load we'll navigate to a page
     // that calls history.back(). When we load a second time (from the back
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 b78902c4b59..73b43829f1a 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
@@ -7,6 +7,8 @@
 <script src='../resources/shadow-dom-utils.js'></script>
 
 <script>
+document.allowDeclarativeShadowDom = true;
+
 const shadowContent = '<span>Shadow tree</span><slot></slot>';
 function getDeclarativeContent(mode, delegatesFocus) {
   const delegatesFocusText = delegatesFocus ? ' shadowrootdelegatesfocus' : '';
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 92e667fdbcf..f17e304fe75 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
@@ -6,7 +6,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
-<div id="host">
+<div id="host" style="display:none">
   <template shadowroot="open">
     <slot id="s1" name="slot1"></slot>
   </template>
@@ -14,6 +14,8 @@
 </div>
 
 <script>
+document.allowDeclarativeShadowDom = true;
+
 test(() => {
   const host = document.querySelector('#host');
   const c1 = host.querySelector('#c1');
@@ -129,7 +131,7 @@ test(() => {
 }, 'Declarative Shadow DOM: innerHTML root element');
 </script>
 
-<div id="multi-host">
+<div id="multi-host" style="display:none">
   <template shadowroot="open">
     <span>root 1</span>
   </template>
@@ -157,6 +159,7 @@ test(() => {
 test(() => {
   const template = document.querySelector('#template-containing-shadow');
   const host1 = document.createElement('div');
+  host1.style.display = 'none';
   document.body.appendChild(host1);
   host1.appendChild(template.content.cloneNode(true));
   let innerDiv = host1.querySelector('div.innerdiv');
@@ -165,6 +168,7 @@ test(() => {
   assert_equals(innerDiv.querySelector('template'), null, "No leftover template node");
 
   const host2 = document.createElement('div');
+  host2.style.display = 'none';
   document.body.appendChild(host2);
   host2.appendChild(template.content.cloneNode(true));
   innerDiv = host2.querySelector('div.innerdiv');
@@ -187,6 +191,7 @@ test(() => {
 test(() => {
   const template = document.querySelector('#template-containing-ua-shadow');
   const host = document.createElement('div');
+  host.style.display = 'none';
   document.body.appendChild(host);
   // Mostly make sure clone of template *does* clone the
   // shadow root, and doesn't crash on cloning the <video>.
@@ -210,6 +215,7 @@ test(() => {
 test(() => {
   const template = document.querySelector('#template-containing-ua-shadow-closed');
   const host = document.createElement('div');
+  host.style.display = 'none';
   document.body.appendChild(host);
   host.appendChild(template.content.cloneNode(true));
   let innerDiv = host.querySelector('div.innerdiv');
diff --git a/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative.html b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative.html
new file mode 100644
index 00000000000..b314adb85c4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative.html
@@ -0,0 +1,226 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Declarative Shadow DOM</title>
+<link rel="author" title="Mason Freed" href="mailto:masonfreed@chromium.org">
+<link rel="help" href="https://github.com/whatwg/dom/issues/831">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<style>
+  * { white-space: pre; }
+  iframe { display:none; }
+</style>
+<div id=log></div>
+
+<div id=mainpage style="display:none">
+  <div class=wrapper>
+    <div class=host>
+      <template shadowroot=open>
+        <span class=content>Content</span>
+      </template>
+    </div>
+  </div>
+</div>
+
+<script>
+const content = `
+  <html><body>
+  <div class=wrapper>
+    <div class=host>
+      <template shadowroot=open>
+        <span class=content>Content</span>
+      </template>
+    </div>
+  </div>
+  </body></html>
+`;
+
+function assert_dsd(el,shouldHaveShadow) {
+  const wrapper = el.querySelector('.wrapper');
+  assert_true(!!wrapper,'Unable to find wrapper element');
+  const host = wrapper.querySelector('.host');
+  assert_true(!!host,'Unable to find host element');
+  if (shouldHaveShadow) {
+    assert_true(!!host.shadowRoot, 'Shadow root NOT FOUND.');
+    assert_true(!!host.shadowRoot.querySelector('.content'),'Unable to locate content');
+  } else {
+    assert_true(!host.shadowRoot, 'Shadow root FOUND - none should be present.');
+    const tmpl = host.querySelector('template');
+    assert_true(!!tmpl, 'The template should be left as a <template> element');
+    assert_equals(tmpl.getAttribute('shadowroot'),'open','The shadowroot attribute should still be present');
+    assert_true(!!tmpl.content.querySelector('.content'),'Unable to locate content');
+  }
+}
+
+test(() => {
+  const div = document.getElementById('mainpage');
+  assert_dsd(div,true);
+  assert_false(document.allowDeclarativeShadowDom,'The default value for allowDeclarativeShadowDom should be false');
+}, 'Non-fragment parsing needs no opt-in');
+
+test(() => {
+  const div = document.createElement('div');
+  div.innerHTML = content;
+  assert_false(document.allowDeclarativeShadowDom,'The default value for allowDeclarativeShadowDom should be false');
+  assert_dsd(div,false);
+  document.allowDeclarativeShadowDom = true;
+  div.innerHTML = content;
+  assert_dsd(div,true);
+  document.allowDeclarativeShadowDom = false; // Don't affect other tests
+}, 'innerHTML on element');
+
+test(() => {
+  const templateContent = `<template id=tmpl>${content}</template>`;
+  assert_false(document.allowDeclarativeShadowDom,'Default allowDeclarativeShadowDom should be false');
+  const div = document.createElement('div');
+  div.innerHTML = templateContent;
+  assert_dsd(div.querySelector('#tmpl').content,false);
+  document.allowDeclarativeShadowDom = true;
+  div.innerHTML = templateContent;
+  assert_dsd(div.querySelector('#tmpl').content,true);
+  // Make sure to set back to avoid affecting other tests
+  document.allowDeclarativeShadowDom = false; // Don't affect other tests
+}, 'innerHTML on element, with template content');
+
+test(() => {
+  const temp = document.createElement('template');
+  temp.innerHTML = content;
+  assert_dsd(temp.content,false, 'innerHTML by default should not allow declarative shadow content');
+  assert_false(document.allowDeclarativeShadowDom,'The default value for document.allowDeclarativeShadowDom should be false');
+  assert_false(temp.content.allowDeclarativeShadowDom,'The default value for template fragment allowDeclarativeShadowDom should be false');
+  temp.content.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting template allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  temp.innerHTML = content;
+  assert_true(temp.content.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom should persist across innerHTML set');
+  assert_dsd(temp.content,true, 'innerHTML should allow declarative shadow content if template.content.allowDeclarativeShadowDom is set');
+  temp.content.allowDeclarativeShadowDom = false;
+  document.allowDeclarativeShadowDom = true;
+  temp.innerHTML = content;
+  assert_false(temp.content.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom should persist across innerHTML set');
+  assert_true(document.allowDeclarativeShadowDom,'document.allowDeclarativeShadowDom should still be set');
+  assert_dsd(temp.content,true, 'innerHTML should allow declarative shadow content if document.allowDeclarativeShadowDom is set');
+  document.allowDeclarativeShadowDom = false; // Don't affect other tests
+}, 'Setting template.innerHTML');
+
+test(() => {
+  const templateContent = `<template id=tmpl>${content}</template>`;
+  const temp = document.createElement('template');
+  temp.innerHTML = templateContent;
+  assert_dsd(temp.content.querySelector('#tmpl').content,false);
+  document.allowDeclarativeShadowDom = true;
+  temp.innerHTML = templateContent;
+  assert_dsd(temp.content.querySelector('#tmpl').content,true);
+  document.allowDeclarativeShadowDom = false; // Don't affect other tests
+}, 'Setting template.innerHTML with nested template content');
+
+test(() => {
+  const parser = new DOMParser();
+  let fragment = parser.parseFromString(content,'text/html');
+  assert_dsd(fragment.body,false);
+  assert_false(parser.allowDeclarativeShadowDom,'The default value for allowDeclarativeShadowDom should be false');
+  parser.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  fragment = parser.parseFromString(content,'text/html');
+  assert_dsd(fragment.body,true);
+}, 'DOMParser');
+
+test(() => {
+  const doc = document.implementation.createHTMLDocument("Document");
+  doc.body.innerHTML = content;
+  assert_dsd(doc.body,false);
+  assert_false(doc.allowDeclarativeShadowDom,'The default value for allowDeclarativeShadowDom should be false');
+  doc.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  doc.body.innerHTML = content;
+  assert_dsd(doc.body,true);
+}, 'createHTMLDocument');
+
+test(() => {
+  const doc = document.implementation.createHTMLDocument("Document");
+  let range = doc.createRange();
+  range.selectNode(doc.body);
+  let documentFragment = range.createContextualFragment(content);
+  assert_dsd(documentFragment,false);
+  doc.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  documentFragment = range.createContextualFragment(content);
+  assert_dsd(documentFragment,true);
+}, 'createContextualFragment');
+
+async_test((t) => {
+  let client = new XMLHttpRequest();
+  client.addEventListener('load', t.step_func_done(() => {
+    assert_true(client.status == 200 && client.responseXML != null);
+    assert_dsd(client.responseXML.body,false);
+    t.done();
+  }));
+  client.open("GET", `data:text/html,${content}`);
+  client.responseType = 'document';
+  assert_false(client.allowDeclarativeShadowDom,'The default value for allowDeclarativeShadowDom should be false');
+  client.send();
+}, 'XMLHttpRequest, disabled');
+
+async_test((t) => {
+  let client = new XMLHttpRequest();
+  client.addEventListener('load', t.step_func_done(() => {
+    assert_true(client.status == 200 && client.responseXML != null);
+    assert_dsd(client.responseXML.body,true);
+    t.done();
+  }));
+  client.open("GET", `data:text/html,${content}`);
+  client.responseType = 'document';
+  client.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  client.send();
+}, 'XMLHttpRequest, enabled');
+
+async_test((t) => {
+  const iframe = document.createElement('iframe');
+  iframe.style.display = "none";
+  iframe.sandbox = "allow-same-origin";
+  document.body.appendChild(iframe);
+  iframe.addEventListener('load', t.step_func_done(() => {
+    assert_dsd(iframe.contentDocument.body,false);
+    t.done();
+  }));
+  iframe.srcdoc = content;
+}, 'iframe, disabled');
+
+async_test((t) => {
+  const iframe = document.createElement('iframe');
+  iframe.style.display = "none";
+  iframe.sandbox = "allow-same-origin allow-declarative-shadow-dom";
+  document.body.appendChild(iframe);
+  iframe.addEventListener('load', t.step_func_done(() => {
+    assert_dsd(iframe.contentDocument.body,true);
+    t.done();
+  }));
+  iframe.allowDeclarativeShadowDom = true;
+  assert_false(document.allowDeclarativeShadowDom,'Setting allowDeclarativeShadowDom shouldn\'t affect document.allowDeclarativeShadowDom');
+  iframe.srcdoc = content;
+}, 'iframe, enabled');
+
+function getHandler(t, name, shouldHaveShadow) {
+  return (e) => {
+    t.step(() => {
+      if (e.data.name == name) {
+        assert_false(e.data.error,e.data.msg);
+        assert_true(e.data.hasShadow == shouldHaveShadow);
+        t.done();
+      }
+    });
+  };
+}
+async_test((t) => {
+  window.addEventListener('message', getHandler(t, 'iframe_disallow', false));
+}, 'iframe without allow-declarative-shadow-dom sandbox flag disallows declarative Shadow DOM');
+
+async_test((t) => {
+  window.addEventListener('message', getHandler(t,'iframe_allow', true));
+}, 'iframe with allow-declarative-shadow-dom sandbox flag allows declarative Shadow DOM');
+
+</script>
+
+<iframe name="iframe_disallow" sandbox="allow-scripts" src="support/declarative-child-frame.html" ></iframe>
+<iframe name="iframe_allow" sandbox="allow-scripts allow-declarative-shadow-dom" src="support/declarative-child-frame.html"></iframe>
diff --git a/tests/wpt/web-platform-tests/shadow-dom/declarative/support/declarative-child-frame.html b/tests/wpt/web-platform-tests/shadow-dom/declarative/support/declarative-child-frame.html
new file mode 100644
index 00000000000..10608b4875e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/shadow-dom/declarative/support/declarative-child-frame.html
@@ -0,0 +1,23 @@
+<div id=iframe>
+  <div id=wrapper>
+    <div id=host>
+      <template shadowroot=open>
+        <span id=content>Content</span>
+      </template>
+    </div>
+  </div>
+</div>
+
+<script>
+function sendStatus(error, hasShadow, msg) {
+  const name = window.name;
+  parent.postMessage({ name, error, hasShadow, msg }, '*');
+}
+
+window.addEventListener('load', () => {
+  const host = document.querySelector('#host');
+  if (!host)
+  	return sendStatus(true, false, 'Unable to find host element');
+  return sendStatus(false, !!host.shadowRoot);
+});
+</script>
\ No newline at end of file