diff --git a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
index 76b44d9e9cf..3605e8f3fc9 100644
--- a/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -4,7 +4,7 @@
     expected: TIMEOUT
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Fetching a blob URL immediately before revoking it works in an iframe.]
     expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
deleted file mode 100644
index f64b45fea6b..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-002.html]
-  [Hit test float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-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/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
index c131078eace..23c61ede1a1 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
@@ -17,3 +17,6 @@
   [test the top of layer]
     expected: FAIL
 
+  [test some point of the element: top left corner]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-001.html.ini
similarity index 83%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-001.html.ini
index df24204e0d3..34ab1c4fb08 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-001.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-001.tentative.html]
+[HTMLLinkElement-disabled-001.html]
   [<link disabled> prevents the stylesheet from being in document.styleSheets (from parser)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-002.html.ini
similarity index 76%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-002.html.ini
index ac0d6d3a943..beaf2961e91 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-002.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-002.tentative.html]
+[HTMLLinkElement-disabled-002.html]
   [HTMLLinkElement.disabled reflects the <link disabled> attribute, and behaves consistently, when the sheet is an alternate]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-003.html.ini
similarity index 72%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-003.html.ini
index 137b92e99e8..a63c586fd67 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-003.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-003.tentative.html]
+[HTMLLinkElement-disabled-003.html]
   [HTMLLinkElement.disabled's explicitly enabled state persists when disconnected and connected again]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-004.html.ini
similarity index 68%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-004.html.ini
index 7f41d0adaa0..20462805942 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-004.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-004.tentative.html]
+[HTMLLinkElement-disabled-004.html]
   [HTMLLinkElement.disabled's explicitly enabled state doesn't persist on clones]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-005.html.ini
similarity index 73%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-005.html.ini
index d4be99bfa4f..4a6b09d9058 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-005.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-005.tentative.html]
+[HTMLLinkElement-disabled-005.html]
   expected: TIMEOUT
   [HTMLLinkElement.disabled's explicitly enabled state persists regardless of rel]
     expected: TIMEOUT
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-007.html.ini
similarity index 71%
rename from tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.tentative.html.ini
rename to tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-007.html.ini
index 77f89988df1..62ef580305f 100644
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-007.html.ini
@@ -1,4 +1,4 @@
-[HTMLLinkElement-disabled-007.tentative.html]
+[HTMLLinkElement-disabled-007.html]
   [HTMLLinkElement.disabled setter sets the explicitly enabled state if toggled back and forth.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-alternate.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-alternate.html.ini
new file mode 100644
index 00000000000..eb0657d3a0a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom/HTMLLinkElement-disabled-alternate.html.ini
@@ -0,0 +1,2 @@
+[HTMLLinkElement-disabled-alternate.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index b49ecea6671..af9eaafe7f1 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 +312,18 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: combined response Content-Type: text/html;" \\" 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]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
index 646a46c0cbb..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
@@ -59,6 +59,3 @@
   [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
-  [separate text/javascript error]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
similarity index 71%
rename from tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
rename to tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
index 385376c7321..75d75b4cda2 100644
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_4.html]
+[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_4.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
rename to tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
index 385376c7321..51f8272a6de 100644
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_4.html]
+[traverse_the_history_3.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/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
index f29162631b3..9a85a905394 100644
--- a/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,8 +1,7 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
   [opener of discarded nested browsing context]
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/dom/idlharness.https.html.ini b/tests/wpt/metadata-layout-2020/html/dom/idlharness.https.html.ini
index 2d66929f9f8..3dabbc6d6a3 100644
--- a/tests/wpt/metadata-layout-2020/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/dom/idlharness.https.html.ini
@@ -1294,9 +1294,6 @@
   [Window interface: window must inherit property "onwebkitanimationiteration" with the proper type]
     expected: FAIL
 
-  [Document interface: new Document() must inherit property "queryCommandSupported(DOMString)" with the proper type]
-    expected: FAIL
-
   [Window interface: attribute onsecuritypolicyviolation]
     expected: FAIL
 
@@ -1315,9 +1312,6 @@
   [Document interface: new Document() must inherit property "onwebkitanimationiteration" with the proper type]
     expected: FAIL
 
-  [Document interface: calling queryCommandSupported(DOMString) on documentWithHandlers with too few arguments must throw TypeError]
-    expected: FAIL
-
   [Document interface: attribute designMode]
     expected: FAIL
 
@@ -1363,9 +1357,6 @@
   [Window interface: existence and properties of interface prototype object]
     expected: FAIL
 
-  [Document interface: calling queryCommandSupported(DOMString) on new Document() with too few arguments must throw TypeError]
-    expected: FAIL
-
   [Window interface: operation focus()]
     expected: FAIL
 
@@ -1408,9 +1399,6 @@
   [Document interface: iframe.contentDocument must inherit property "onwebkitanimationiteration" with the proper type]
     expected: FAIL
 
-  [Document interface: operation queryCommandSupported(DOMString)]
-    expected: FAIL
-
   [Document interface: attribute onwebkittransitionend]
     expected: FAIL
 
@@ -1504,9 +1492,6 @@
   [Window interface: window must inherit property "blur()" with the proper type]
     expected: FAIL
 
-  [Document interface: iframe.contentDocument must inherit property "queryCommandSupported(DOMString)" with the proper type]
-    expected: FAIL
-
   [Document interface: operation execCommand(DOMString, optional boolean, optional DOMString)]
     expected: FAIL
 
@@ -1534,9 +1519,6 @@
   [Document interface: iframe.contentDocument must inherit property "queryCommandEnabled(DOMString)" with the proper type]
     expected: FAIL
 
-  [Document interface: calling queryCommandSupported(DOMString) on iframe.contentDocument with too few arguments must throw TypeError]
-    expected: FAIL
-
   [Window interface: operation blur()]
     expected: FAIL
 
@@ -1615,9 +1597,6 @@
   [Document interface: iframe.contentDocument must inherit property "onsecuritypolicyviolation" with the proper type]
     expected: FAIL
 
-  [Document interface: documentWithHandlers must inherit property "queryCommandSupported(DOMString)" with the proper type]
-    expected: FAIL
-
   [Document interface: new Document() must inherit property "queryCommandValue(DOMString)" with the proper type]
     expected: FAIL
 
@@ -2499,9 +2478,6 @@
   [HTMLInputElement interface: createInput("radio") must inherit property "height" with the proper type]
     expected: FAIL
 
-  [HTMLImageElement interface: document.createElement("img") must inherit property "referrerPolicy" with the proper type]
-    expected: FAIL
-
   [HTMLTableElement interface: document.createElement("table") must inherit property "align" with the proper type]
     expected: FAIL
 
@@ -2850,9 +2826,6 @@
   [HTMLLinkElement interface: document.createElement("link") must inherit property "imageSizes" with the proper type]
     expected: FAIL
 
-  [HTMLImageElement interface: attribute referrerPolicy]
-    expected: FAIL
-
   [HTMLInputElement interface: createInput("time") must inherit property "align" with the proper type]
     expected: FAIL
 
@@ -3063,9 +3036,6 @@
   [HTMLObjectElement interface: attribute width]
     expected: FAIL
 
-  [HTMLImageElement interface: new Image() must inherit property "referrerPolicy" with the proper type]
-    expected: FAIL
-
   [HTMLInputElement interface: createInput("reset") must inherit property "useMap" with the proper type]
     expected: FAIL
 
@@ -3495,3 +3465,9 @@
   [HTMLSlotElement interface: operation assignedNodes(optional AssignedNodesOptions)]
     expected: FAIL
 
+  [HTMLLinkElement interface: document.createElement("link") must inherit property "disabled" with the proper type]
+    expected: FAIL
+
+  [HTMLLinkElement interface: attribute disabled]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini b/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini
new file mode 100644
index 00000000000..0081ab92ae0
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini
@@ -0,0 +1,5 @@
+[window-domain-failure.https.sub.html]
+  expected: TIMEOUT
+  [SharedArrayBuffer and a same-origin-domain (but not same-origin) iframe]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini b/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini
new file mode 100644
index 00000000000..80f3f9dd4bd
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini
@@ -0,0 +1,13 @@
+[window-iframe-messagechannel.https.html]
+  [postMessaging with a MessageChannel that's been cross-site should succeed]
+    expected: FAIL
+
+  [postMessaging to a same-site iframe via MessageChannel should fail]
+    expected: FAIL
+
+  [postMessaging to a cross-site iframe via MessageChannel should fail]
+    expected: FAIL
+
+  [postMessaging to a same-origin iframe via MessageChannel allows them to see each others' modifications]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index b000fc2afe3..f45aaafe1c5 100644
--- a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -14,6 +14,3 @@
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
 
-  [Non-HTMLElement should not support autofocus]
-    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 1b74d6e073d..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
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/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 9eb581fcf1f..0407f0cc2b7 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
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/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/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 5ddb9bfeff6..a1effd5f801 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata-layout-2020/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata-layout-2020/webxr/anchors/ar_anchor_states.https.html.ini b/tests/wpt/metadata-layout-2020/webxr/anchors/ar_anchor_states.https.html.ini
new file mode 100644
index 00000000000..4385dfb3f1f
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webxr/anchors/ar_anchor_states.https.html.ini
@@ -0,0 +1,10 @@
+[ar_anchor_states.https.html]
+  [Anchor creation fails if the feature was not requested]
+    expected: FAIL
+
+  [Anchor creation fails if the feature was requested but the session already ended]
+    expected: FAIL
+
+  [Anchor creation succeeds if the feature was requested]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
index d4f62ed7113..faa00f45ecf 100644
--- a/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
+++ b/tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini
@@ -7,7 +7,7 @@
     expected: FAIL
 
   [Opening a blob URL in a new window immediately before revoking it works.]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Opening a blob URL in a noopener about:blank window immediately before revoking it works.]
     expected: TIMEOUT
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 38bade9dd7e..6e1ab7e0277 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -122849,6 +122849,32 @@
        {}
       ]
      ],
+     "inset-box-shadow-scroll.html": [
+      "7eca4ea544ff76740e13490fb995dfda5705336d",
+      [
+       null,
+       [
+        [
+         "/css/css-backgrounds/inset-box-shadow-scroll-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "inset-box-shadow-stacking-context-scroll.html": [
+      "edd79b88be2a71fc6054e7e866c8cabe03948a89",
+      [
+       null,
+       [
+        [
+         "/css/css-backgrounds/inset-box-shadow-scroll-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "scroll-positioned-multiple-background-images.html": [
       "a9ca550ce3dea2626de05bf31437a0a19aeedbce",
       [
@@ -165743,6 +165769,19 @@
        {}
       ]
      ],
+     "absolute-tables-007.html": [
+      "7922da49224c666156ff20765301b490ef91eafd",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square.xht",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "anonymous-table-cell-margin-collapsing.html": [
       "23b467ebacc983122a632f4d5971c8daca569420",
       [
@@ -206304,8 +206343,8 @@
      ]
     },
     "cssom": {
-     "HTMLLinkElement-disabled-alternate.tentative.html": [
-      "5b020a172b175ac21d76052cfd44139d376f6605",
+     "HTMLLinkElement-disabled-alternate.html": [
+      "f1457c0dcf04d27a52a29fc860e94e81d432e5af",
       [
        null,
        [
@@ -206646,6 +206685,19 @@
        {}
       ]
      ],
+     "backdrop-filter-opacity-rounded-clip.html": [
+      "88fed5742034734f539d965d99ffa20c16428282",
+      [
+       null,
+       [
+        [
+         "/css/filter-effects/backdrop-filter-opacity-rounded-clip-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "backdrop-filter-paint-order.html": [
       "88531532fc33296e8c8eca5452da04d5d612662d",
       [
@@ -246607,7 +246659,7 @@
       []
      ],
      "user-activation.js": [
-      "babd5b2cd32131a65d3eb81c4f5508fefff064cb",
+      "ed294bb9cb27b552f23061118fcd260dc6b86a8f",
       []
      ]
     }
@@ -268229,7 +268281,7 @@
     },
     "resources": {
      "cookie-helper.sub.js": [
-      "fcc1addf2954292037cf77b211bf37920a921e23",
+      "1a163332e3c1821e690e1659842cd30202440f06",
       []
      ],
      "drop.py": [
@@ -268315,6 +268367,10 @@
        "1dceb4e43681c81b6c1b8877fd2d9f2b34391a02",
        []
       ],
+      "iframe.document.html": [
+       "7026beb7e816d7079c1d1625227cabf4d329b7ee",
+       []
+      ],
       "navigate.html": [
        "7d0f87d49439088dc78883e85cfc5c6bcc291d4e",
        []
@@ -287012,6 +287068,10 @@
       "10324966edb042c1c7298ce22dad76766c2a777b",
       []
      ],
+     "inset-box-shadow-scroll-ref.html": [
+      "55be941bfc35e8d064e811335242fd06dc28da67",
+      []
+     ],
      "justfortest.html": [
       "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
       []
@@ -311812,6 +311872,10 @@
       "0453d7f2feda3367e0f7536d91b0b159d627dd5d",
       []
      ],
+     "backdrop-filter-opacity-rounded-clip-ref.html": [
+      "79177d1238730466d6e5b1a2b5354ee1a1e00db1",
+      []
+     ],
      "backdrop-filter-paint-order-ref.html": [
       "bd82e520f0e70b75e45c687cb46f957a579e2358",
       []
@@ -328793,6 +328857,14 @@
          "6604450991a122e3e241e40b1b9e0516c525389d",
          []
         ],
+        "iframe-domain-failure.sub.html": [
+         "cf795c23805889f6e036873264444b631862d204",
+         []
+        ],
+        "iframe-domain-failure.sub.html.headers": [
+         "56d0ac342824434c621fb50f9351e2e74aa077cb",
+         []
+        ],
         "iframe-failure.html": [
          "2c33dba79a2fb9e6a81fc9ee5805b378e826f725",
          []
@@ -328817,11 +328889,11 @@
          "4e798cd9f5d3f756df077a43ce9a1a6f9b41fd28",
          []
         ],
-        "incrementer-iframe-domain.sub.html": [
-         "a6dd70177584c9115c24beb281e7681110c07624",
+        "iframe-messagechannel-site-failure.html": [
+         "95a610f928584b89a5d9fb3a711337db21f839e9",
          []
         ],
-        "incrementer-iframe-domain.sub.html.headers": [
+        "iframe-messagechannel-site-failure.html.headers": [
          "56d0ac342824434c621fb50f9351e2e74aa077cb",
          []
         ],
@@ -328934,7 +329006,7 @@
         "63b60e490f47f4db77d33d7a4ca2f5b9a4181de8",
         []
        ],
-       "window-domain-success.https.sub.html.headers": [
+       "window-domain-failure.https.sub.html.headers": [
         "63b60e490f47f4db77d33d7a4ca2f5b9a4181de8",
         []
        ],
@@ -328958,10 +329030,6 @@
         "63b60e490f47f4db77d33d7a4ca2f5b9a4181de8",
         []
        ],
-       "window-similar-but-cross-origin-success.https.sub.html.headers": [
-        "63b60e490f47f4db77d33d7a4ca2f5b9a4181de8",
-        []
-       ],
        "window-simple-success.https.html.headers": [
         "63b60e490f47f4db77d33d7a4ca2f5b9a4181de8",
         []
@@ -333006,7 +333074,7 @@
        []
       ],
       "structured-clone-battery-of-tests.js": [
-       "751a0e1a9ea8b549543f2e78551b0d00b4fc6127",
+       "0c96ded2088357e0d581587f4a1a66c74c9198b6",
        []
       ]
      },
@@ -333908,7 +333976,7 @@
    },
    "interfaces": {
     "BackgroundSync.idl": [
-     "f84faf7bcd3bf1e836136bfbe34b6ba68f2bd25c",
+     "c52dcdb89843e80e9bd89591df76ba26f7172dab",
      []
     ],
     "CSP.idl": [
@@ -333999,6 +334067,10 @@
      "fe77a2f942827c5fbb842db74556d5e8353a9cb3",
      []
     ],
+    "compression.idl": [
+     "47d2b9e48d06ae830ade5aef4b1c0914995a5e1f",
+     []
+    ],
     "console.idl": [
      "3cd3c06b54b022c61857a6a29e8e97bf4fa9b47b",
      []
@@ -334159,6 +334231,10 @@
      "ada6c0c302cdff87a78a0e8ec5ac25a8f0e64922",
      []
     ],
+    "get-installed-related-apps.idl": [
+     "cbea101d300f0082d7d020809c9c2da3e581ad90",
+     []
+    ],
     "gyroscope.idl": [
      "3754fd81e6bf605a308794e5b759ecd8784a6a15",
      []
@@ -334176,7 +334252,7 @@
      []
     ],
     "html.idl": [
-     "7b2a96ce6760a05b49e9c445b4050a991acd342b",
+     "09e1a29043b5bb56b3366d2cbb13b5e834424121",
      []
     ],
     "image-capture.idl": [
@@ -334745,7 +334821,7 @@
     ]
    },
    "lint.ignore": [
-    "776c6332900bdd6bacade294131ce1ba028c7d1b",
+    "078a706f079c3cfc2a88dbd8ce9b3b290d1ffcfb",
     []
    ],
    "loading": {
@@ -339504,6 +339580,14 @@
       "ce2b968391343339a9958100f564fa73d5c01509",
       []
      ],
+     "mock-screenenumeration.js": [
+      "0f71db8f5062a3ff0344d7999d65ddd5271a04fc",
+      []
+     ],
+     "mock-screenenumeration.js.header": [
+      "6805c323df5a975231648b830e33ce183c3cbbd3",
+      []
+     ],
      "mock-sms-receiver.js": [
       "c4aa9a86f2c8a15303f96cc9859b2ec146eb2f58",
       []
@@ -339589,7 +339673,7 @@
       []
      ],
      "webxr-test-math-helper.js": [
-      "14e163712670f1dd5f081d0189bfe719bbd08bd6",
+      "22c6c12d08fe1a739857bec0da88e89c8abffc60",
       []
      ],
      "webxr-test-math-helper.js.headers": [
@@ -339597,7 +339681,7 @@
       []
      ],
      "webxr-test.js": [
-      "4809ac86bd3e487aceefbfb62ccd191e6395d70a",
+      "adbb42eed8b70bef4c2786344fc24d90faf47bb8",
       []
      ],
      "webxr-test.js.headers": [
@@ -340124,6 +340208,18 @@
      []
     ]
    },
+   "screen_enumeration": {
+    "README.md": [
+     "04b2ecce7c274f03fd5b0dbebecf82882f009902",
+     []
+    ],
+    "resources": {
+     "screenenumeration-helpers.js": [
+      "d96fca74b5d4520103f459120881b2aa03994a54",
+      []
+     ]
+    }
+   },
    "scroll-animations": {
     "META.yml": [
      "c53f1f432fe1ec2887e30af396a1f1574b76b95d",
@@ -344821,11 +344917,11 @@
       ]
      },
      "commands.json": [
-      "044322eed3baf467c6d809fc26ac958598942311",
+      "d4e3ce8128002b8f83f33dc4a21852afd908e724",
       []
      ],
      "quic_transport_server.py": [
-      "9a04ad17f195c6e5d233e84a9b23904cccfeccd6",
+      "deef46fb8a74c8ff41c0b5e8d229ab7a34d19c10",
       []
      ],
      "requirements.txt": [
@@ -344833,7 +344929,7 @@
       []
      ],
      "serve.py": [
-      "9893f25e27bdb3afd4bf39921e96abdcc4233f9d",
+      "517b4c34b93ed4293c43f30a2baec8b920197d27",
       []
      ]
     },
@@ -344935,7 +345031,7 @@
       []
      ],
      "serve.py": [
-      "43ff7bd0dfbac5eae74cbe43235f016c4fe14d35",
+      "d98c81eafbb86585ecac5b7047a40d874eb54fe7",
       []
      ],
      "test_functional.py": [
@@ -350418,7 +350514,7 @@
        []
       ],
       "environment.py": [
-       "f76836ea66b59bb16f2d3792451bcf28ecb2fb44",
+       "1236d1f9bc291f590f74236cf2ad01d84d4785df",
        []
       ],
       "executors": {
@@ -351073,6 +351169,10 @@
        "869d3d4604409411984cb49fcd40eb7e971b3c52",
        []
       ],
+      "test_response.py": [
+       "f8048ac1ce5529a600df1da4db9dfb4154f202c9",
+       []
+      ],
       "test_stash.py": [
        "31af1558b0cc5c046843e0e96569db42c467cf22",
        []
@@ -351112,7 +351212,7 @@
        []
       ],
       "response.py": [
-       "b6f274474519846d298a29da0b3db3961999b24f",
+       "b24f0cdf476850a10cdbe94bb857fc61ce32bcf8",
        []
       ],
       "router.py": [
@@ -355959,7 +356059,7 @@
       []
      ],
      "webxr_test_constants.js": [
-      "3ae294c015a73fc193ce68c0f80aec4111c3302c",
+      "139ab775684c427e39bc50719226c96fcbd3a5d5",
       []
      ],
      "webxr_test_constants_fake_world.js": [
@@ -375181,6 +375281,39 @@
        "timeout": "long"
       }
      ]
+    ],
+    "idlharness.https.any.js": [
+     "c439d5b51910ba570c2b0273fc813e7e51c02c4d",
+     [
+      "compression/idlharness.https.any.html",
+      {
+       "script_metadata": [
+        [
+         "script",
+         "/resources/WebIDLParser.js"
+        ],
+        [
+         "script",
+         "/resources/idlharness.js"
+        ]
+       ]
+      }
+     ],
+     [
+      "compression/idlharness.https.any.worker.html",
+      {
+       "script_metadata": [
+        [
+         "script",
+         "/resources/WebIDLParser.js"
+        ],
+        [
+         "script",
+         "/resources/idlharness.js"
+        ]
+       ]
+      }
+     ]
     ]
    },
    "console": {
@@ -380021,7 +380154,7 @@
       ]
      ],
      "fetch.https.html": [
-      "4daf357004a71cea5b0e58a44bf8919d96ad7ce8",
+      "89050e03afd7f5aab3288be468f2dbf9712cc71d",
       [
        null,
        {
@@ -380036,7 +380169,7 @@
       ]
      ],
      "form-get-blank-reload.https.html": [
-      "026254549729cd4b5acc1f0c59833c55aa4e56e2",
+      "611255f7374dae54994a2c3b20687765969d708f",
       [
        null,
        {}
@@ -380047,7 +380180,7 @@
       ]
      ],
      "form-get-blank.https.html": [
-      "61af99967292abe8249f81d9fcd098c1f51273d7",
+      "6fe28c21cc0c3a5912ef3f69e751ba7e936a15c0",
       [
        null,
        {
@@ -380062,7 +380195,7 @@
       ]
      ],
      "form-post-blank-reload.https.html": [
-      "69f720efc5bb129b08beaafeb9bdae2c00239cd2",
+      "fedb0a03c5a9a69d64d0f372855f1f512d1a9a2f",
       [
        null,
        {}
@@ -380073,7 +380206,7 @@
       ]
      ],
      "form-post-blank.https.html": [
-      "4ffd522b322e158baf7d1877aa5485dc010159b1",
+      "d3cd369ca67a86bcd25c4f5a901e669beb77446c",
       [
        null,
        {
@@ -380088,7 +380221,7 @@
       ]
      ],
      "iframe-reload.https.html": [
-      "9bfbdfd64186848df1b7b7165b5799d54c7dc8f7",
+      "a33c4dd4eb2ac9aa22ee6c45157d6f1cfb48675a",
       [
        null,
        {
@@ -380102,8 +380235,17 @@
        }
       ]
      ],
+     "iframe.document.html": [
+      "2d276dbcaa9ce740ffdd8c8516defe18ab51de95",
+      [
+       null,
+       {
+        "timeout": "long"
+       }
+      ]
+     ],
      "iframe.https.html": [
-      "446b8c50c004a5c6599b73052ba870dac4aa70a9",
+      "04ebb95836d7b4700e93eedb7ef0a07b943ec3fa",
       [
        null,
        {
@@ -380173,7 +380315,7 @@
       ]
      ],
      "window-open-reload.https.html": [
-      "ee2091b1373a1da7068722c2557332e3a7f60b05",
+      "f21b6a77de5c5bac6cc19195f098995b21deb3b5",
       [
        null,
        {}
@@ -380184,7 +380326,7 @@
       ]
      ],
      "window-open.https.html": [
-      "d685eb47fd07872116caa22d2b8ca23774f26a81",
+      "7ee3ef43abea9bd86c4989b304846a7395d9d447",
       [
        null,
        {
@@ -394330,21 +394472,21 @@
      "aspect-ratio": {
       "parsing": {
        "contain-intrinsic-size-computed.html": [
-        "bf56adb9fe136d5e73c4dd5caec2cb4040b75115",
+        "76fb5842ae691de4025795bc80777a61ceebbb6e",
         [
          null,
          {}
         ]
        ],
        "contain-intrinsic-size-invalid.html": [
-        "20378ab8cfe4f346d841a9a59e579a90b8147515",
+        "e13c3ad07e1c25777cc9533407c0e57f6c6e5ddb",
         [
          null,
          {}
         ]
        ],
        "contain-intrinsic-size-valid.html": [
-        "96b3ca59acc8af8c292fdaf2cc255475e7929d1f",
+        "c7add59d1e408ad7f7aee459da49f9f072de845f",
         [
          null,
          {}
@@ -403010,50 +403152,50 @@
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-001.tentative.html": [
-      "877356f924de995aca09579739c6120af2caab1e",
+     "HTMLLinkElement-disabled-001.html": [
+      "f2c5d0a545939b78e5833c19e83de660dd845ea2",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-002.tentative.html": [
-      "9c46f60a6214538168b48cd06b16fda0ce52ec63",
+     "HTMLLinkElement-disabled-002.html": [
+      "34bd8182fef40b0b596661437f7840735f83c517",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-003.tentative.html": [
-      "fc86e6ba1f052231c4de47cbcece07c85a6f68b9",
+     "HTMLLinkElement-disabled-003.html": [
+      "3d391bbaff064e094c5a4c1d7c2748257b900a93",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-004.tentative.html": [
-      "7e6c34ee40d97319e4b2ac39262bba9935fd7d3b",
+     "HTMLLinkElement-disabled-004.html": [
+      "f163f1d68e066ad89241b43ffd6f29d161b1b3c1",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-005.tentative.html": [
-      "0233f8c746ed83c1b912df3c0e8ba489d9bd4325",
+     "HTMLLinkElement-disabled-005.html": [
+      "76de20632726b753e21c15d4a5a18472edd5753d",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-006.tentative.html": [
-      "5828e1ce14217384fd9445297ddffbfcfc4e4c7e",
+     "HTMLLinkElement-disabled-006.html": [
+      "02749a2e11d41ca7556b65ecd42ee3a004fa7fe2",
       [
        null,
        {}
       ]
      ],
-     "HTMLLinkElement-disabled-007.tentative.html": [
-      "451fc3d591f2c8e12964282eb1314d4962429923",
+     "HTMLLinkElement-disabled-007.html": [
+      "9a695a964cb5916af69db3ba8a3ff44e00bb1a87",
       [
        null,
        {}
@@ -409004,7 +409146,7 @@
       ]
      ],
      "ParentNode-replaceChildren.html": [
-      "6557db4412847be59f4ecedc89731d6fa89314b9",
+      "b1c1008284bbf999d5c61d971b6c8b10704e16e9",
       [
        null,
        {}
@@ -450382,8 +450524,8 @@
          {}
         ]
        ],
-       "window-domain-success.https.sub.html": [
-        "9205d01df26e3274692f48aa76d7ffceba9e51ac",
+       "window-domain-failure.https.sub.html": [
+        "1175b56fb0463449a4a589ed86cb26d27533d0a5",
         [
          null,
          {}
@@ -450397,7 +450539,7 @@
         ]
        ],
        "window-iframe-messagechannel.https.html": [
-        "16a054a52e1ef9ecb42fa5d2e7ceff4a1496f3ab",
+        "acef65cbdff4bd28d6ca4f46c13141e3dbeed95d",
         [
          null,
          {}
@@ -450424,13 +450566,6 @@
          {}
         ]
        ],
-       "window-similar-but-cross-origin-success.https.sub.html": [
-        "e25fc9002d02d3c1177447012fcfc9f77381bda7",
-        [
-         null,
-         {}
-        ]
-       ],
        "window-simple-success.https.html": [
         "4b86f9befa6a04c03211a7f30e9cb2d1a63ad06d",
         [
@@ -450460,13 +450595,6 @@
         }
        ]
       ],
-      "structured_clone_bigint.html": [
-       "b00f88a016bf7f5fa041ba12ce8cb9524f542c0b",
-       [
-        null,
-        {}
-       ]
-      ],
       "structuredclone_0.html": [
        "c8a6d38393c0217447992d47c994942e873e70ad",
        [
@@ -467167,7 +467295,7 @@
    },
    "installedapp": {
     "idlharness.https.window.js": [
-     "3988dba414aabb69ff72d28642d84d89544e63dc",
+     "7774da6803d40031ee9b45f4d0a6bb42f51d4e3d",
      [
       "installedapp/idlharness.https.window.html",
       {
@@ -467183,8 +467311,13 @@
         [
          "script",
          "/resources/idlharness.js"
+        ],
+        [
+         "timeout",
+         "long"
         ]
-       ]
+       ],
+       "timeout": "long"
       }
      ]
     ],
@@ -467328,7 +467461,7 @@
      ]
     ],
     "isIntersecting-threshold.html": [
-     "106b65edd7525d089224ff3192f57614d6c58ed6",
+     "842c8e2c9f96deb5e6e167230fae2e32b9d5e779",
      [
       null,
       {}
@@ -490015,14 +490148,43 @@
    },
    "screen_enumeration": {
     "getScreens.tentative.https.window.js": [
-     "76223b7907cd09f971acd0166318d7eb84c84c98",
+     "f496282b01620f8b1d2d10c11e961f6fbb9dc56a",
      [
       "screen_enumeration/getScreens.tentative.https.window.html",
       {
        "script_metadata": [
         [
          "global",
-         "window,dedicatedworker,sharedworker,serviceworker"
+         "window"
+        ],
+        [
+         "script",
+         "/resources/testdriver.js"
+        ],
+        [
+         "script",
+         "/resources/testdriver-vendor.js"
+        ]
+       ]
+      }
+     ]
+    ],
+    "getScreens.values.https.html": [
+     "5ce54839deefc78a9da98f7283d71c55705281f8",
+     [
+      null,
+      {}
+     ]
+    ],
+    "screen_enumeration_permission.window.js": [
+     "00adbfc52acfceedc949093444f24f04f9dc1a27",
+     [
+      "screen_enumeration/screen_enumeration_permission.window.html",
+      {
+       "script_metadata": [
+        [
+         "global",
+         "window"
         ],
         [
          "script",
@@ -514611,7 +514773,7 @@
      ]
     ],
     "RTCPeerConnection-mandatory-getStats.https.html": [
-     "e48d133f464a9a1e9f2b17b3c6eb5f3c375cae34",
+     "5b0d59153dca428518ee510e01e1d4ffe87abf00",
      [
       null,
       {
@@ -519782,10 +519944,10 @@
    },
    "webtransport": {
     "quic": {
-     "client-indication.any.js": [
-      "15baa5f8542cb2d1a1c73f03dca24dcd09cfc5f6",
+     "client-indication.sub.any.js": [
+      "62f2f3fe4d22bd767db78650c1cc9dda2053e6ce",
       [
-       "webtransport/quic/client-indication.any.html",
+       "webtransport/quic/client-indication.sub.any.html",
        {
         "quic": true,
         "script_metadata": [
@@ -519801,7 +519963,7 @@
        }
       ],
       [
-       "webtransport/quic/client-indication.any.worker.html",
+       "webtransport/quic/client-indication.sub.any.worker.html",
        {
         "quic": true,
         "script_metadata": [
@@ -520943,6 +521105,15 @@
     }
    },
    "webxr": {
+    "anchors": {
+     "ar_anchor_states.https.html": [
+      "907da06880e9fe7908a32afbf2ddcb642e174b41",
+      [
+       null,
+       {}
+      ]
+     ]
+    },
     "ar-module": {
      "idlharness.https.window.js": [
       "51cc3c42808a66ddde083b8982317e8cdd961c71",
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
deleted file mode 100644
index f64b45fea6b..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-002.html]
-  [Hit test float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-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/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
index 85e94926cb3..5733d536fd3 100644
--- a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
@@ -21,3 +21,6 @@
   [test the top of layer]
     expected: FAIL
 
+  [test some point of the element: top left corner]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.html.ini
new file mode 100644
index 00000000000..34ab1c4fb08
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-001.html.ini
@@ -0,0 +1,7 @@
+[HTMLLinkElement-disabled-001.html]
+  [<link disabled> prevents the stylesheet from being in document.styleSheets (from parser)]
+    expected: FAIL
+
+  [HTMLLinkElement.disabled reflects the <link disabled> attribute, and behaves consistently]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.html.ini
new file mode 100644
index 00000000000..beaf2961e91
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-002.html.ini
@@ -0,0 +1,4 @@
+[HTMLLinkElement-disabled-002.html]
+  [HTMLLinkElement.disabled reflects the <link disabled> attribute, and behaves consistently, when the sheet is an alternate]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.html.ini
new file mode 100644
index 00000000000..a63c586fd67
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-003.html.ini
@@ -0,0 +1,4 @@
+[HTMLLinkElement-disabled-003.html]
+  [HTMLLinkElement.disabled's explicitly enabled state persists when disconnected and connected again]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.html.ini
new file mode 100644
index 00000000000..20462805942
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-004.html.ini
@@ -0,0 +1,4 @@
+[HTMLLinkElement-disabled-004.html]
+  [HTMLLinkElement.disabled's explicitly enabled state doesn't persist on clones]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.html.ini
new file mode 100644
index 00000000000..4a6b09d9058
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-005.html.ini
@@ -0,0 +1,5 @@
+[HTMLLinkElement-disabled-005.html]
+  expected: TIMEOUT
+  [HTMLLinkElement.disabled's explicitly enabled state persists regardless of rel]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.html.ini
new file mode 100644
index 00000000000..62ef580305f
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-007.html.ini
@@ -0,0 +1,4 @@
+[HTMLLinkElement-disabled-007.html]
+  [HTMLLinkElement.disabled setter sets the explicitly enabled state if toggled back and forth.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.html.ini
new file mode 100644
index 00000000000..eb0657d3a0a
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.html.ini
@@ -0,0 +1,2 @@
+[HTMLLinkElement-disabled-alternate.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html.ini b/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html.ini
deleted file mode 100644
index bc28e5443c7..00000000000
--- a/tests/wpt/metadata/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[HTMLLinkElement-disabled-alternate.tentative.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 9cd23a99ed3..5f288edbddd 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 +312,18 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: combined response Content-Type: text/html;" \\" 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]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/html;" text/plain]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 646a46c0cbb..5c001592859 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -59,6 +59,3 @@
   [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
-  [separate text/javascript error]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_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/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/windows/embedded-opener-remove-frame.html.ini b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
index c757b400205..442db3cb549 100644
--- a/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
+++ b/tests/wpt/metadata/html/browsers/windows/embedded-opener-remove-frame.html.ini
@@ -1,5 +1,4 @@
 [embedded-opener-remove-frame.html]
-  expected: CRASH
   [opener and "removed" embedded documents]
     expected: FAIL
 
@@ -7,5 +6,5 @@
     expected: FAIL
 
   [opener of discarded auxiliary browsing context]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/idlharness.https.html.ini b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
index ead25462f30..b0b337f71d8 100644
--- a/tests/wpt/metadata/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
@@ -3780,3 +3780,9 @@
   [HTMLSlotElement interface: operation assignedNodes(optional AssignedNodesOptions)]
     expected: FAIL
 
+  [HTMLLinkElement interface: document.createElement("link") must inherit property "disabled" with the proper type]
+    expected: FAIL
+
+  [HTMLLinkElement interface: attribute disabled]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini
new file mode 100644
index 00000000000..0081ab92ae0
--- /dev/null
+++ b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.ini
@@ -0,0 +1,5 @@
+[window-domain-failure.https.sub.html]
+  expected: TIMEOUT
+  [SharedArrayBuffer and a same-origin-domain (but not same-origin) iframe]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html.ini b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html.ini
deleted file mode 100644
index dfe9a4f6bce..00000000000
--- a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[window-domain-success.https.sub.html]
-  [postMessaging to a same-origin-domain (but not same-origin) iframe allows them to see each others' modifications]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini
index 1d4d31c40b5..358083c5133 100644
--- a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini
+++ b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html.ini
@@ -11,3 +11,6 @@
   [postMessaging to a same-origin iframe via MessageChannel allows them to see each others' modifications]
     expected: FAIL
 
+  [postMessaging to a same-site iframe via MessageChannel should fail]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.ini b/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.ini
deleted file mode 100644
index 2ceabfb79eb..00000000000
--- a/tests/wpt/metadata/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[window-similar-but-cross-origin-success.https.sub.html]
-  [postMessaging to a not same-origin-domain, but similar origin, iframe allows them to see each others' modifications]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 3363dff158f..6b68e9094e4 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -14,6 +14,3 @@
   [Host element with delegatesFocus should support autofocus]
     expected: FAIL
 
-  [Non-HTMLElement should not support autofocus]
-    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 3f7e3e9544f..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
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/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 45d8be1c898..d43f38b40cd 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
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/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/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 5ddb9bfeff6..a1effd5f801 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -16,5 +15,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini b/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata/webmessaging/without-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/webxr/anchors/ar_anchor_states.https.html.ini b/tests/wpt/metadata/webxr/anchors/ar_anchor_states.https.html.ini
new file mode 100644
index 00000000000..4385dfb3f1f
--- /dev/null
+++ b/tests/wpt/metadata/webxr/anchors/ar_anchor_states.https.html.ini
@@ -0,0 +1,10 @@
+[ar_anchor_states.https.html]
+  [Anchor creation fails if the feature was not requested]
+    expected: FAIL
+
+  [Anchor creation fails if the feature was requested but the session already ended]
+    expected: FAIL
+
+  [Anchor creation succeeds if the feature was requested]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/clipboard-apis/resources/user-activation.js b/tests/wpt/web-platform-tests/clipboard-apis/resources/user-activation.js
index babd5b2cd32..ed294bb9cb2 100644
--- a/tests/wpt/web-platform-tests/clipboard-apis/resources/user-activation.js
+++ b/tests/wpt/web-platform-tests/clipboard-apis/resources/user-activation.js
@@ -3,6 +3,10 @@
 // In order to use this function, please import testdriver.js and
 // testdriver-vendor.js, and include a <body> element.
 async function waitForUserActivation() {
+  if (window.opener) {
+    throw new Error(
+        "waitForUserActivation() only works in the top-level frame");
+  }
   const loadedPromise = new Promise(resolve => {
     if(document.readyState == 'complete') {
       resolve();
diff --git a/tests/wpt/web-platform-tests/compression/idlharness.https.any.js b/tests/wpt/web-platform-tests/compression/idlharness.https.any.js
new file mode 100644
index 00000000000..c439d5b5191
--- /dev/null
+++ b/tests/wpt/web-platform-tests/compression/idlharness.https.any.js
@@ -0,0 +1,17 @@
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+
+'use strict';
+
+// https://wicg.github.io/compression/
+
+idl_test(
+  ['compression'],
+  [],
+  idl_array => {
+    idl_array.add_objects({
+      CompressionStream: ['new CompressionStream("deflate")'],
+      DecompressionStream: ['new DecompressionStream("deflate")'],
+    });
+  }
+);
diff --git a/tests/wpt/web-platform-tests/cookies/resources/cookie-helper.sub.js b/tests/wpt/web-platform-tests/cookies/resources/cookie-helper.sub.js
index fcc1addf295..1a163332e3c 100644
--- a/tests/wpt/web-platform-tests/cookies/resources/cookie-helper.sub.js
+++ b/tests/wpt/web-platform-tests/cookies/resources/cookie-helper.sub.js
@@ -68,7 +68,7 @@ function create_cookie(origin, name, value, extras) {
 function set_prefixed_cookie_via_dom_test(options) {
   promise_test(t => {
     var name = options.prefix + "prefixtestcookie";
-    erase_cookie_from_js(name, options.paras);
+    erase_cookie_from_js(name, options.params);
     t.add_cleanup(() => erase_cookie_from_js(name, options.params));
     var value = "" + Math.random();
     document.cookie = name + "=" + value + ";" + options.params;
@@ -104,11 +104,17 @@ function set_prefixed_cookie_via_http_test(options) {
 // SameSite-specific test helpers:
 //
 
+// status for "network" cookies.
 window.SameSiteStatus = {
   CROSS_SITE: "cross-site",
   LAX: "lax",
   STRICT: "strict"
 };
+// status for "document.cookie".
+window.DomSameSiteStatus = {
+  CROSS_SITE: "cross-site",
+  SAME_SITE: "same-site",
+};
 
 const wait_for_message = (type, origin) => {
   return new Promise((resolve, reject) => {
@@ -155,7 +161,7 @@ async function resetSameSiteCookies(origin, value) {
 // Given an |expectedStatus| and |expectedValue|, assert the |cookies| contains the
 // proper set of cookie names and values, according to the legacy behavior where
 // unspecified SameSite attribute defaults to SameSite=None behavior.
-function verifySameSiteCookieStateLegacy(expectedStatus, expectedValue, cookies) {
+function verifySameSiteCookieStateLegacy(expectedStatus, expectedValue, cookies, domCookieStatus) {
     assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always sent.");
     assert_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are always sent.");
     if (expectedStatus == SameSiteStatus.CROSS_SITE) {
@@ -170,14 +176,14 @@ function verifySameSiteCookieStateLegacy(expectedStatus, expectedValue, cookies)
     }
 
     if (cookies["domcookies"]) {
-      verifyDocumentCookie(expectedStatus, expectedValue, cookies["domcookies"]);
+      verifyDocumentCookieLegacy(domCookieStatus, expectedValue, cookies["domcookies"]);
     }
 }
 
 // Same as above except this expects samesite_unspecified to act the same as
 // samesite_lax (which is the behavior expected when SameSiteByDefault is
 // enabled).
-function verifySameSiteCookieStateWithSameSiteByDefault(expectedStatus, expectedValue, cookies) {
+function verifySameSiteCookieStateWithSameSiteByDefault(expectedStatus, expectedValue, cookies, domCookieStatus) {
     assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always sent.");
     if (expectedStatus == SameSiteStatus.CROSS_SITE) {
       assert_not_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are not sent with cross-site requests.");
@@ -194,11 +200,11 @@ function verifySameSiteCookieStateWithSameSiteByDefault(expectedStatus, expected
     }
 
     if (cookies["domcookies"]) {
-      verifyDocumentCookie(expectedStatus, expectedValue, cookies["domcookies"]);
+      verifyDocumentCookieWithSameSiteByDefault(domCookieStatus, expectedValue, cookies["domcookies"]);
     }
 }
 
-function verifyDocumentCookie(expectedStatus, expectedValue, domcookies) {
+function verifyDocumentCookieLegacy(expectedStatus, expectedValue, domcookies) {
   const cookies = domcookies.split(";")
                             .map(cookie => cookie.trim().split("="))
                             .reduce((obj, cookie) => {
@@ -206,10 +212,38 @@ function verifyDocumentCookie(expectedStatus, expectedValue, domcookies) {
                               return obj;
                             }, {});
 
-  assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always included in document.cookie.");
-  assert_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are always included in document.cookie.");
-  assert_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are always included in document.cookie.");
-  assert_equals(cookies["samesite_lax"], expectedValue, "SameSite=Lax cookies are always included in document.cookie.");
+  if (expectedStatus == DomSameSiteStatus.SAME_SITE) {
+    assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_lax"], expectedValue, "SameSite=Lax cookies are always included in document.cookie.");
+  } else if (expectedStatus == DomSameSiteStatus.CROSS_SITE) {
+    assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are always included in document.cookie.");
+    assert_not_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are not included in document.cookie when cross-site.");
+    assert_not_equals(cookies["samesite_lax"], expectedValue, "SameSite=Lax cookies are not included in document.cookie when cross-site.");
+  }
+}
+
+function verifyDocumentCookieWithSameSiteByDefault(expectedStatus, expectedValue, domcookies) {
+  const cookies = domcookies.split(";")
+                            .map(cookie => cookie.trim().split("="))
+                            .reduce((obj, cookie) => {
+                              obj[cookie[0]] = cookie[1];
+                              return obj;
+                            }, {});
+
+  if (expectedStatus == DomSameSiteStatus.SAME_SITE) {
+    assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are always included in document.cookie.");
+    assert_equals(cookies["samesite_lax"], expectedValue, "SameSite=Lax cookies are always included in document.cookie.");
+  } else if (expectedStatus == DomSameSiteStatus.CROSS_SITE) {
+    assert_equals(cookies["samesite_none"], expectedValue, "SameSite=None cookies are always included in document.cookie.");
+    assert_not_equals(cookies["samesite_unspecified"], expectedValue, "Unspecified-SameSite cookies are not included in document.cookie when cross-site.");
+    assert_not_equals(cookies["samesite_strict"], expectedValue, "SameSite=Strict cookies are not included in document.cookie when cross-site.");
+    assert_not_equals(cookies["samesite_lax"], expectedValue, "SameSite=Lax cookies are not included in document.cookie when cross-site.");
+  }
 }
 
 function isLegacySameSite() {
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/fetch.https.html b/tests/wpt/web-platform-tests/cookies/samesite/fetch.https.html
index 4daf357004a..89050e03afd 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/fetch.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/fetch.https.html
@@ -15,7 +15,7 @@
           return credFetch(target + "/cookies/resources/list.py")
 
             .then(r => r.json())
-            .then(cookies => getSameSiteVerifier()(expectedStatus, value, cookies));
+            .then(cookies => getSameSiteVerifier()(expectedStatus, value, cookies, DomSameSiteStatus.SAME_SITE));
         });
     }, title);
   }
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank-reload.https.html b/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank-reload.https.html
index 02625454972..611255f7374 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank-reload.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank-reload.https.html
@@ -30,7 +30,7 @@
             var reloaded = false;
             var msgHandler = e => {
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
               } catch (e) {
                 reject(e);
               }
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank.https.html b/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank.https.html
index 61af9996729..6fe28c21cc0 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/form-get-blank.https.html
@@ -33,7 +33,7 @@
               window.removeEventListener("message", msgHandler);
               e.source.close();
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
                 resolve("Popup received the cookie.");
               } catch (e) {
                 reject(e);
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank-reload.https.html b/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank-reload.https.html
index 69f720efc5b..fedb0a03c5a 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank-reload.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank-reload.https.html
@@ -20,7 +20,7 @@
             var reloaded = false;
             var msgHandler = e => {
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
               } catch (e) {
                 reject(e);
               }
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank.https.html b/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank.https.html
index 4ffd522b322..d3cd369ca67 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/form-post-blank.https.html
@@ -22,7 +22,7 @@
               window.removeEventListener("message", msgHandler);
               e.source.close();
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
                 resolve("Popup received the cookie.");
               } catch (e) {
                 reject(e);
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/iframe-reload.https.html b/tests/wpt/web-platform-tests/cookies/samesite/iframe-reload.https.html
index 9bfbdfd6418..a33c4dd4eb2 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/iframe-reload.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/iframe-reload.https.html
@@ -9,7 +9,7 @@
 <!-- We're appending an <iframe> to the document's body, so execute tests after we have a body -->
 <body>
 <script>
-  function create_test(origin, target, expectedStatus, title) {
+  function create_test(origin, target, expectedStatus, expectedDomStatus, title) {
     promise_test(t => {
       var value = "" + Math.random();
       return resetSameSiteCookies(origin, value)
@@ -21,7 +21,7 @@
             var reloaded = false;
             var msgHandler = e => {
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, expectedDomStatus);
               } catch (e) {
                 reject(e);
               }
@@ -44,7 +44,7 @@
     }, title);
   }
 
-  create_test(SECURE_ORIGIN, SECURE_ORIGIN, SameSiteStatus.STRICT, "Reloaded same-host fetches are strictly same-site");
-  create_test(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN, SameSiteStatus.STRICT, "Reloaded subdomain fetches are strictly same-site");
-  create_test(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN, SameSiteStatus.CROSS_SITE, "Reloaded cross-site fetches are cross-site");
+  create_test(SECURE_ORIGIN, SECURE_ORIGIN, SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Reloaded same-host fetches are strictly same-site");
+  create_test(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN, SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Reloaded subdomain fetches are strictly same-site");
+  create_test(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN, SameSiteStatus.CROSS_SITE, DomSameSiteStatus.CROSS_SITE, "Reloaded cross-site fetches are cross-site");
 </script>
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/iframe.document.html b/tests/wpt/web-platform-tests/cookies/samesite/iframe.document.html
new file mode 100644
index 00000000000..2d276dbcaa9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/cookies/samesite/iframe.document.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/cookies/resources/cookie-helper.sub.js"></script>
+<!-- We're appending an <iframe> to the document's body, so execute tests after we have a body -->
+<body>
+<script>
+  function create_test(target, expectedDomStatus, title) {
+    promise_test(async t => {
+      let cookieValue = await new Promise((resolve, reject) => {
+        var iframe = document.createElement("iframe");
+
+        window.onmessage = t.step_func(e => {
+          if (e.source == iframe.contentWindow) {
+            document.body.removeChild(iframe);
+            resolve(e.data.value);
+          }
+        });
+
+        iframe.src = target + "/cookies/samesite/resources/iframe.document.html";
+        document.body.appendChild(iframe);
+      });
+
+      await new Promise((resolve, reject) => {
+        var iframe = document.createElement("iframe");
+
+        window.onmessage = t.step_func(e => {
+          if (e.source == iframe.contentWindow) {
+            // Cleanup, then verify cookie state:
+            document.body.removeChild(iframe);
+
+            const cookies = e.data;
+            assert_equals(cookies["dc_samesite_none"], cookieValue, "SameSite=none cookies can be set via document.cookies even by cross-origin documents");
+
+            if (expectedDomStatus === DomSameSiteStatus.SAME_SITE) {
+              assert_equals(cookies["dc_samesite_lax"], cookieValue, "SameSite=lax cookies can be set via document.cookies by same-site documents");
+              assert_equals(cookies["dc_samesite_strict"], cookieValue, "SameSite=strict cookies can be set via document.cookies by same-site documents");
+            } else if (expectedDomStatus === DomSameSiteStatus.CROSS_SITE) {
+              assert_not_equals(cookies["dc_samesite_lax"], cookieValue, "SameSite=lax cookies can be set via document.cookies by same-site documents");
+              assert_not_equals(cookies["dc_samesite_strict"], cookieValue, "SameSite=strict cookies can be set via document.cookies by same-site documents");
+            }
+
+            resolve();
+          }
+        });
+
+        iframe.src = target + "/cookies/resources/postToParent.py";
+        document.body.appendChild(iframe);
+      });
+    }, title);
+  }
+
+  create_test(SECURE_ORIGIN, DomSameSiteStatus.SAME_SITE, "Same-site iframes can set lax/strict cookies via document.cookie");
+  create_test(SECURE_CROSS_SITE_ORIGIN, DomSameSiteStatus.CROSS_SITE, "Cross-site iframe cannot set lax/strict cookies via document.cookie");
+</script>
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/iframe.https.html b/tests/wpt/web-platform-tests/cookies/samesite/iframe.https.html
index 446b8c50c00..04ebb95836d 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/iframe.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/iframe.https.html
@@ -9,7 +9,7 @@
 <!-- We're appending an <iframe> to the document's body, so execute tests after we have a body -->
 <body>
 <script>
-  function create_test(origin, target, expectedStatus, title) {
+  function create_test(origin, target, expectedStatus, expectedDomStatus, title) {
     promise_test(t => {
       var value = "" + Math.random();
       return resetSameSiteCookies(origin, value)
@@ -24,7 +24,7 @@
                 document.body.removeChild(iframe);
                 window.removeEventListener("message", msgHandler);
                 try {
-                  getSameSiteVerifier()(expectedStatus, value, e.data);
+                  getSameSiteVerifier()(expectedStatus, value, e.data, expectedDomStatus);
                   resolve();
                 } catch(e) {
                   reject(e);
@@ -41,22 +41,22 @@
   }
 
   // No redirect:
-  create_test(SECURE_ORIGIN, SECURE_ORIGIN, SameSiteStatus.STRICT, "Same-host fetches are strictly same-site");
-  create_test(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN, SameSiteStatus.STRICT, "Subdomain fetches are strictly same-site");
-  create_test(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN, SameSiteStatus.CROSS_SITE, "Cross-site fetches are cross-site");
+  create_test(SECURE_ORIGIN, SECURE_ORIGIN, SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Same-host fetches are strictly same-site");
+  create_test(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN, SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Subdomain fetches are strictly same-site");
+  create_test(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN, SameSiteStatus.CROSS_SITE, DomSameSiteStatus.CROSS_SITE, "Cross-site fetches are cross-site");
 
   // Redirect from {same-host,subdomain,cross-site} to same-host:
-  create_test(SECURE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, "Same-host redirecting to same-host fetches are strictly same-site");
-  create_test(SECURE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, "Subdomain redirecting to same-host fetches are strictly same-site");
-  create_test(SECURE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, "Cross-site redirecting to same-host fetches are strictly same-site");
+  create_test(SECURE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Same-host redirecting to same-host fetches are strictly same-site");
+  create_test(SECURE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Subdomain redirecting to same-host fetches are strictly same-site");
+  create_test(SECURE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Cross-site redirecting to same-host fetches are strictly same-site");
 
   // Redirect from {same-host,subdomain,cross-site} to same-host:
-  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, "Same-host redirecting to subdomain fetches are strictly same-site");
-  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, "Subdomain redirecting to subdomain fetches are strictly same-site");
-  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, "Cross-site redirecting to subdomain fetches are strictly same-site");
+  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Same-host redirecting to subdomain fetches are strictly same-site");
+  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Subdomain redirecting to subdomain fetches are strictly same-site");
+  create_test(SECURE_SUBDOMAIN_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_SUBDOMAIN_ORIGIN), SameSiteStatus.STRICT, DomSameSiteStatus.SAME_SITE, "Cross-site redirecting to subdomain fetches are strictly same-site");
 
   // Redirect from {same-host,subdomain,cross-site} to cross-site:
-  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, "Same-host redirecting to cross-site fetches are cross-site");
-  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, "Subdomain redirecting to cross-site fetches are cross-site");
-  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, "Cross-site redirecting to cross-site fetches are cross-site");
+  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, DomSameSiteStatus.CROSS_SITE, "Same-host redirecting to cross-site fetches are cross-site");
+  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_SUBDOMAIN_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, DomSameSiteStatus.CROSS_SITE, "Subdomain redirecting to cross-site fetches are cross-site");
+  create_test(SECURE_CROSS_SITE_ORIGIN, redirectTo(SECURE_CROSS_SITE_ORIGIN, SECURE_CROSS_SITE_ORIGIN), SameSiteStatus.CROSS_SITE, DomSameSiteStatus.CROSS_SITE, "Cross-site redirecting to cross-site fetches are cross-site");
 </script>
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/resources/iframe.document.html b/tests/wpt/web-platform-tests/cookies/samesite/resources/iframe.document.html
new file mode 100644
index 00000000000..7026beb7e81
--- /dev/null
+++ b/tests/wpt/web-platform-tests/cookies/samesite/resources/iframe.document.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<script>
+  var value = "" + Math.random();
+  document.cookie = `dc_samesite_strict=${value}; secure; sameSite=strict; path=/`;
+  document.cookie = `dc_samesite_lax=${value}; secure; sameSite=lax; path=/`;
+  document.cookie = `dc_samesite_none=${value}; secure; sameSite=none; path=/`;
+  parent.postMessage({value}, "*");
+</script>
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/window-open-reload.https.html b/tests/wpt/web-platform-tests/cookies/samesite/window-open-reload.https.html
index ee2091b1373..f21b6a77de5 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/window-open-reload.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/window-open-reload.https.html
@@ -17,7 +17,7 @@
             var reloaded = false;
             var msgHandler = e => {
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
               } catch (e) {
                 reject(e);
               }
diff --git a/tests/wpt/web-platform-tests/cookies/samesite/window-open.https.html b/tests/wpt/web-platform-tests/cookies/samesite/window-open.https.html
index d685eb47fd0..7ee3ef43abe 100644
--- a/tests/wpt/web-platform-tests/cookies/samesite/window-open.https.html
+++ b/tests/wpt/web-platform-tests/cookies/samesite/window-open.https.html
@@ -19,7 +19,7 @@
               window.removeEventListener("message", msgHandler);
               w.close();
               try {
-                getSameSiteVerifier()(expectedStatus, value, e.data);
+                getSameSiteVerifier()(expectedStatus, value, e.data, DomSameSiteStatus.SAME_SITE);
                 resolve("Popup received the cookie.");
               } catch (e) {
                 reject(e);
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll-ref.html b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll-ref.html
new file mode 100644
index 00000000000..55be941bfc3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<style>
+#target {
+  width: 220px;
+  height: 120px;
+  overflow: scroll;
+}
+#inner {
+  padding: 10px;
+  box-shadow: 10px 10px green inset;
+  height: 120px;
+}
+</style>
+<div id="target">
+  <div id="inner">
+    Passes if green inset shadow is visible.
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll.html b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll.html
new file mode 100644
index 00000000000..7eca4ea544f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-scroll.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel="help" href="http://www.w3.org/TR/css3-background/#the-box-shadow">
+<link rel="match" href="inset-box-shadow-scroll-ref.html"/>
+<style>
+#target {
+  width: 200px;
+  height: 100px;
+  overflow: scroll;
+  background-color: white;
+  box-shadow: 10px 10px green inset;
+  padding: 10px;
+}
+#inner {
+  height: 120px;
+}
+</style>
+<div id="target">
+  <div id="inner">
+    Passes if green inset shadow is visible.
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-stacking-context-scroll.html b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-stacking-context-scroll.html
new file mode 100644
index 00000000000..edd79b88be2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-backgrounds/inset-box-shadow-stacking-context-scroll.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<link rel="help" href="http://www.w3.org/TR/css3-background/#the-box-shadow">
+<link rel="match" href="inset-box-shadow-scroll-ref.html"/>
+<style>
+#target {
+  position: absolute;
+  z-index: 1;
+  width: 200px;
+  height: 100px;
+  overflow: scroll;
+  background-color: white;
+  box-shadow: 10px 10px green inset;
+  padding: 10px;
+}
+#inner {
+  height: 120px;
+}
+</style>
+<div id="target">
+  <div id="inner">
+    Passes if green inset shadow is visible.
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
index bf56adb9fe1..76fb5842ae6 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
@@ -20,6 +20,9 @@ test_computed_value("aspect-ratio", "16.3 / 9.5");
 test_computed_value("aspect-ratio", "16/9", "16 / 9");
 test_computed_value("aspect-ratio", "0 / 9");
 test_computed_value("aspect-ratio", "16 / 0");
+test_computed_value("aspect-ratio", "auto 1");
+test_computed_value("aspect-ratio", "auto 1 / 1", "auto 1");
+test_computed_value("aspect-ratio", "0 auto", "auto 0");
 // The computed value of a <ratio> is the pair of numbers provided, unless
 // both numbers are zero, in which case the computed value is the pair (1, 0)
 // (same as 1 / 0).
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
index 20378ab8cfe..e13c3ad07e1 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
@@ -13,6 +13,6 @@ test_invalid_value("aspect-ratio", "auto / 16");
 test_invalid_value("aspect-ratio", "16 9");
 test_invalid_value("aspect-ratio", "16px / 9px");
 test_invalid_value("aspect-ratio", "16 / -9");
-test_invalid_value("aspect-ratio", "1 auto");
-test_invalid_value("aspect-ratio", "1.5 auto");
+test_invalid_value("aspect-ratio", "1 invalid");
+test_invalid_value("aspect-ratio", "invalid 1.5");
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
index 96b3ca59acc..c7add59d1e4 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
@@ -19,6 +19,8 @@ test_valid_value("aspect-ratio", "16 /9", "16 / 9");
 test_valid_value("aspect-ratio", "16/ 9", "16 / 9");
 test_valid_value("aspect-ratio", "0 / 9");
 test_valid_value("aspect-ratio", "16 / 0");
+test_valid_value("aspect-ratio", "auto 16");
+test_valid_value("aspect-ratio", "16 auto", "auto 16");
 // https://github.com/w3c/csswg-drafts/issues/5084
 test_valid_value("aspect-ratio", "0 / 0", "1 / 0");
 </script>
diff --git a/tests/wpt/web-platform-tests/css/css-tables/absolute-tables-007.html b/tests/wpt/web-platform-tests/css/css-tables/absolute-tables-007.html
new file mode 100644
index 00000000000..7922da49224
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-tables/absolute-tables-007.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/903224">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="A positioned absolute table should resolve its %-height against its containing block.">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="position:relative; width:100px;">
+  <div style="position:absolute; display:table; width:100%; height:100%; background:green;"></div>
+  <div style="height:100px; background:red;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.html
similarity index 91%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.html
index 877356f924d..f2c5d0a5459 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-001.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;, HTMLLinkElement.disabled and CSSStyleSheet.disabled interactions</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <link title="alt" rel="stylesheet" disabled href="data:text/css,html { background: green }">
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.html
similarity index 90%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.html
index 9c46f60a621..34bd8182fef 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-002.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;, HTMLLinkElement.disabled and CSSStyleSheet.disabled interactions (alternate)</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <link title="alt" rel="alternate stylesheet" disabled href="data:text/css,html { background: green }">
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.html
similarity index 89%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.html
index fc86e6ba1f0..3d391bbaff0 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-003.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;'s "explicitly enabled" state persists after getting disconnected from the tree</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <link title="alt" rel="alternate stylesheet" disabled href="data:text/css,html { background: green }">
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.html
similarity index 91%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.html
index 7e6c34ee40d..f163f1d68e0 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-004.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;'s "explicitly enabled" state doesn't persist for clones</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <link title="alt" rel="alternate stylesheet" disabled href="data:text/css,html { background: green }">
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.html
similarity index 87%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.html
index 0233f8c746e..76de2063272 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-005.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;'s "explicitly enabled" persists across rel changes</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <link title="alt" rel="yadayada" disabled href="data:text/css,html { background: green }">
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.html
similarity index 88%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.html
index 5828e1ce142..02749a2e11d 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-006.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;'s "explicitly enabled" state isn't magically set from the setter</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.html
similarity index 88%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.html
index 451fc3d591f..9a695a964cb 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-007.html
@@ -2,8 +2,7 @@
 <title>&lt;link disabled&gt;'s "explicitly enabled" state works when set explicitly back and forth</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.html
similarity index 82%
rename from tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html
rename to tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.html
index 5b020a172b1..f1457c0dcf0 100644
--- a/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.tentative.html
+++ b/tests/wpt/web-platform-tests/css/cssom/HTMLLinkElement-disabled-alternate.html
@@ -3,8 +3,7 @@
 <title>CSS Test: alternate stylesheets can be disabled by HTMLLinkElement.disabled if they have the disabled attribute already</title>
 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
 <link rel="author" title="Mozilla" href="https://mozilla.org">
-<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1281135">
-<link rel="help" href="https://github.com/whatwg/html/issues/3840">
+<link rel="help" href="https://html.spec.whatwg.org/#attr-link-disabled">
 <link rel="match" href="HTMLLinkElement-disabled-alternate-ref.html">
 <link title="alt" rel="alternate stylesheet" href="data:text/css,html { background: green }" disabled onload="document.documentElement.className = ''">
 <script>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip-ref.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip-ref.html
new file mode 100644
index 00000000000..79177d12387
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="position: relative; left: 100px; background: green; width: 100px; height: 100px"></div>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip.html b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip.html
new file mode 100644
index 00000000000..88fed574203
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/backdrop-filter-opacity-rounded-clip.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>backdrop-filter with opacity:0 under border radius overflow clip should have no effect</title>
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match"  href="backdrop-filter-opacity-rounded-clip-ref.html">
+<div style="width: 300px; height: 200px; border-radius: 80px; overflow: hidden; position: relative">
+  <!-- This should be fully clipped by the outer rounded clip. -->
+  <div style="width: 10px; height: 10px; background: cyan"></div>
+  <!-- This should be fully visible and not affected by the backdrop filter. -->
+  <div style="position: absolute; top: 0; left: 100px; width: 100px; height: 100px; background: green"></div>
+  <div style="position: absolute; top: 0; left: 100px; width: 100px; height: 1000px; opacity: 0; backdrop-filter: blur(3px)"></div>
+</div>
+
diff --git a/tests/wpt/web-platform-tests/dom/nodes/ParentNode-replaceChildren.html b/tests/wpt/web-platform-tests/dom/nodes/ParentNode-replaceChildren.html
index 6557db44128..b1c1008284b 100644
--- a/tests/wpt/web-platform-tests/dom/nodes/ParentNode-replaceChildren.html
+++ b/tests/wpt/web-platform-tests/dom/nodes/ParentNode-replaceChildren.html
@@ -94,14 +94,14 @@
 
       const observer = new MutationObserver(mutations => {
         t.step(() => {
-          assert_equals(phase, 1);
-          assert_equals(mutations.length, 1);
+          assert_equals(phase, 1, "phase");
+          assert_equals(mutations.length, 1, "mutations.length");
           const mutation = mutations[0];
-          assert_equals(mutation.type, "childList");
-          assert_equals(mutation.addedNodes.length, 2);
-          assert_array_equals([...mutation.addedNodes], insertions);
-          assert_equals(mutation.removedNodes.length, 2);
-          assert_array_equals([...mutation.removedNodes], children);
+          assert_equals(mutation.type, "childList", "mutation.type");
+          assert_equals(mutation.addedNodes.length, 2, "added nodes length");
+          assert_array_equals([...mutation.addedNodes], insertions, "added nodes");
+          assert_equals(mutation.removedNodes.length, 2, "removed nodes length");
+          assert_array_equals([...mutation.removedNodes], children, "removed nodes");
         });
         t.done();
       });
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html
new file mode 100644
index 00000000000..cf795c23805
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>A test page that postMessage a SharedArrayBuffer to the parent and also sets document.domain</title>
+
+<script>
+"use strict";
+
+document.domain = "{{host}}";
+parent.postMessage(new SharedArrayBuffer(10), "*");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html.headers b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html.headers
similarity index 100%
rename from tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html.headers
rename to tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html.headers
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html
new file mode 100644
index 00000000000..95a610f9285
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<script>
+  const channel = new MessageChannel();
+  window.parent.postMessage(channel.port2, '*', [channel.port2]);
+  channel.port1.onmessage = e => { channel.port1.postMessage("message event received") };
+  channel.port1.onmessageerror = () => channel.port1.postMessage("messageerror event received");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.headers b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html.headers
similarity index 51%
rename from tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.headers
rename to tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html.headers
index 63b60e490f4..56d0ac34282 100644
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html.headers
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-messagechannel-site-failure.html.headers
@@ -1,2 +1,2 @@
-Cross-Origin-Opener-Policy: same-origin
 Cross-Origin-Embedder-Policy: require-corp
+Cross-Origin-Resource-Policy: same-site
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html
deleted file mode 100644
index a6dd7017758..00000000000
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html
+++ /dev/null
@@ -1,11 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>A test page that messes with a given SharedArrayBuffer and also sets document.domain</title>
-<script src="test-incrementer.js"></script>
-
-<script>
-"use strict";
-
-document.domain = "{{host}}";
-setupDestinationIncrementer(self, parent, "*");
-</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html
new file mode 100644
index 00000000000..1175b56fb04
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Structured cloning of SharedArrayBuffers into same-origin-domain windows</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#structuredserialize">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id="log"></div>
+
+<script>
+"use strict";
+document.domain = "{{host}}";
+
+async_test(t => {
+  const iframe = document.createElement("iframe");
+  t.add_cleanup(() => iframe.remove());
+  iframe.src = "//{{domains[www1]}}:{{location[port]}}/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/iframe-domain-failure.sub.html";
+  window.onmessage = t.unreached_func("Got a message event, expected a messageerror event");
+  window.onmessageerror = t.step_func_done();
+  document.body.append(iframe);
+}, "SharedArrayBuffer and a same-origin-domain (but not same-origin) iframe");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html.headers b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.headers
similarity index 100%
rename from tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html.headers
rename to tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-failure.https.sub.html.headers
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html
deleted file mode 100644
index 9205d01df26..00000000000
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-domain-success.https.sub.html
+++ /dev/null
@@ -1,26 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Structured cloning of SharedArrayBuffers into same-origin-domain windows</title>
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#structuredserialize">
-<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="resources/test-incrementer.js"></script>
-
-<div id="log"></div>
-
-<script>
-"use strict";
-document.domain = "{{host}}";
-
-promise_test(t => {
-  return new Promise(resolve => {
-    const iframe = document.createElement("iframe");
-    iframe.onload = t.step_func(() => {
-      resolve(testSharingViaIncrementerScript(t, window, "window", iframe.contentWindow, "iframe", "*"));
-    });
-    iframe.src = "//{{domains[www1]}}:{{location[port]}}/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe-domain.sub.html";
-    document.body.appendChild(iframe);
-  });
-}, "postMessaging to a same-origin-domain (but not same-origin) iframe allows them to see each others' modifications");
-</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html
index 16a054a52e1..acef65cbdff 100644
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-iframe-messagechannel.https.html
@@ -10,23 +10,33 @@
 <div id="log"></div>
 
 <script>
-["same-origin", "same-site"].forEach(originOrSite => {
-  promise_test(t => {
-    return new Promise(resolve => {
-      const iframe = document.createElement("iframe");
-      window.onmessage = t.step_func((message) => {
-        // data will be a MessagePort
-        resolve(testSharingViaIncrementerScript(t, message.data, "window", message.data, "iframe"));
-      });
-      let url = "resources/incrementer-iframe-messagechannel.html";
-      if (originOrSite === "same-site") {
-        url = get_host_info().HTTPS_REMOTE_ORIGIN + new URL(url, window.location).pathname;
-      }
-      iframe.src = url;
-      document.body.appendChild(iframe);
+promise_test(t => {
+  return new Promise(resolve => {
+    const iframe = document.createElement("iframe");
+    window.onmessage = t.step_func((message) => {
+      // data will be a MessagePort
+      resolve(testSharingViaIncrementerScript(t, message.data, "window", message.data, "iframe"));
     });
-  }, `postMessaging to a ${originOrSite} iframe via MessageChannel allows them to see each others' modifications`);
-});
+    iframe.src = "resources/incrementer-iframe-messagechannel.html";
+    document.body.appendChild(iframe);
+  });
+}, `postMessaging to a same-origin iframe via MessageChannel allows them to see each others' modifications`);
+
+promise_test(t => {
+  return new Promise(resolve => {
+    const iframe = document.createElement("iframe");
+    window.onmessage = t.step_func((message) => {
+      // data will be a MessagePort
+      message.data.postMessage(new SharedArrayBuffer(10));
+      message.data.onmessage = t.step_func(message => {
+        assert_equals(message.data, "messageerror event received");
+        resolve();
+      });
+    });
+    iframe.src = get_host_info().HTTPS_REMOTE_ORIGIN + new URL("resources/iframe-messagechannel-site-failure.html", window.location).pathname;
+    document.body.appendChild(iframe);
+  });
+}, "postMessaging to a same-site iframe via MessageChannel should fail");
 
 promise_test(t => {
   return new Promise(resolve => {
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html
deleted file mode 100644
index e25fc9002d0..00000000000
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.https.sub.html
+++ /dev/null
@@ -1,26 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Structured cloning of SharedArrayBuffers to similar-origin, but not same-origin, windows</title>
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#structuredserialize">
-<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="resources/test-incrementer.js"></script>
-
-<div id="log"></div>
-
-<script>
-"use strict";
-document.domain = "{{host}}";
-
-promise_test(t => {
-  return new Promise(resolve => {
-    const iframe = document.createElement("iframe");
-    iframe.onload = t.step_func(() => {
-      resolve(testSharingViaIncrementerScript(t, window, "window", iframe.contentWindow, "iframe", "*"));
-    });
-    iframe.src = "//{{domains[www1]}}:{{location[port]}}/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/resources/incrementer-iframe.html";
-    document.body.appendChild(iframe);
-  });
-}, "postMessaging to a not same-origin-domain, but similar origin, iframe allows them to see each others' modifications");
-</script>
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html
deleted file mode 100644
index b00f88a016b..00000000000
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/structured_clone_bigint.html
+++ /dev/null
@@ -1,77 +0,0 @@
-<!doctype html>
-<!-- Merge this into structured-clone-battery-of-tests.js once
-     https://bugs.webkit.org/show_bug.cgi?id=179001 is fixed to get better test coverage. -->
-<html>
- <head>
-  <meta content="text/html; charset=utf-8" http-equiv="content-type" />
-  <title>2.7 Safe passing of structured data</title>
-  <link rel="help" href="https://html.spec.whatwg.org/multipage/#safe-passing-of-structured-data" />
-  <script src="/resources/testharness.js"></script>
-  <script src="/resources/testharnessreport.js"></script>
-</head>
-<body>
- <div id="log"></div>
-
-<script type="text/javascript">
-    // Note, this test is designed to be in a similar style to
-    // html/infrastructure/safe-passing-of-structured-data/structuredclone_0.html
-    // It is in a separate file to avoid causing a syntax error on UAs which
-    // do not yet support BigInt, so the rest of the test can continue running.
-
-    var worker;
-    var testCollection;
-    setup(function()
-    {
-        //the worker is used for each test in sequence
-        //worker's callback will be set for each test
-        //worker's internal onmessage echoes the data back to this thread through postMessage
-        worker = new Worker("./resources/echo-worker.js");
-        testCollection = [
-            function() {
-                var t = async_test("Primitive BigInt is cloned");
-                t.id = 0;
-                worker.onmessage = t.step_func(function(e) {assert_equals(1n, e.data, "1n === event.data"); t.done(); });
-                t.step(function() { worker.postMessage(1n);});
-            },
-            function() {
-                var t = async_test("Instance of BigInt is cloned");
-                t.id = 1;
-                var obj;
-                t.step(function() {obj = Object(1n);});
-                worker.onmessage = t.step_func(function(e) {
-                    assert_equals(obj.constructor, e.data.constructor, "BigInt === event.data.constructor");
-                    assert_equals(obj.valueOf(), e.data.valueOf(), "(BigInt(1n)).valueOf() === event.data.valueOf()");
-                    t.done();
-                });
-                t.step(function() { worker.postMessage(obj);});
-            },
-        ];
-    }, {explicit_done:true});
-
-    //Callback for result_callback
-    //queues the next test in the array testCollection
-    //serves to make test execution sequential from the async worker callbacks
-    //alternatively, we would have to create a worker for each test
-    function testFinished(test) {
-        if(test.id < testCollection.length - 1) {
-            //queue the function so that stack remains shallow
-            queue(testCollection[test.id+1]);
-        } else {
-            //when the last test has run, explicitly end test suite
-            done();
-        }
-    }
-    function queue(func) {
-        step_timeout(func, 10);
-    }
-
-    add_result_callback(testFinished);
-    //start the first test manually
-    queue(testCollection[0]);
-
-
-
-
- </script>
-</body>
-</html>
diff --git a/tests/wpt/web-platform-tests/html/webappapis/structured-clone/structured-clone-battery-of-tests.js b/tests/wpt/web-platform-tests/html/webappapis/structured-clone/structured-clone-battery-of-tests.js
index 751a0e1a9ea..0c96ded2088 100644
--- a/tests/wpt/web-platform-tests/html/webappapis/structured-clone/structured-clone-battery-of-tests.js
+++ b/tests/wpt/web-platform-tests/html/webappapis/structured-clone/structured-clone-battery-of-tests.js
@@ -55,7 +55,7 @@ function compare_Object(callback, callback_is_async) {
 
 function enumerate_props(compare_func, test_obj) {
   return function(actual, input) {
-    for (var x in input) {
+    for (const x in input) {
       compare_func(actual[x], input[x], test_obj);
     }
   };
@@ -80,6 +80,10 @@ check('primitive number, 9007199254740992', 9007199254740992, compare_primitive)
 check('primitive number, -9007199254740992', -9007199254740992, compare_primitive);
 check('primitive number, 9007199254740994', 9007199254740994, compare_primitive);
 check('primitive number, -9007199254740994', -9007199254740994, compare_primitive);
+check('primitive BigInt, 0n', 0n, compare_primitive);
+check('primitive BigInt, -0n', -0n, compare_primitive);
+check('primitive BigInt, -9007199254740994000n', -9007199254740994000n, compare_primitive);
+check('primitive BigInt, -9007199254740994000900719925474099400090071992547409940009007199254740994000n', -9007199254740994000900719925474099400090071992547409940009007199254740994000n, compare_primitive);
 
 check('Array primitives', [undefined,
                            null,
@@ -99,7 +103,10 @@ check('Array primitives', [undefined,
                            9007199254740992,
                            -9007199254740992,
                            9007199254740994,
-                           -9007199254740994], compare_Array(enumerate_props(compare_primitive)));
+                           -9007199254740994,
+                           -12n,
+                           -0n,
+                           0n], compare_Array(enumerate_props(compare_primitive)));
 check('Object primitives', {'undefined':undefined,
                            'null':null,
                            'true':true,
@@ -135,7 +142,7 @@ check('Array Boolean objects', [new Boolean(true), new Boolean(false)], compare_
 check('Object Boolean objects', {'true':new Boolean(true), 'false':new Boolean(false)}, compare_Object(enumerate_props(compare_Boolean)));
 
 function compare_obj(what) {
-  var Type = self[what];
+  const Type = self[what];
   return function(actual, input, test_obj) {
     if (typeof actual === 'string')
       assert_unreached(actual);
@@ -172,6 +179,9 @@ check('Number 9007199254740992', new Number(9007199254740992), compare_obj('Numb
 check('Number -9007199254740992', new Number(-9007199254740992), compare_obj('Number'));
 check('Number 9007199254740994', new Number(9007199254740994), compare_obj('Number'));
 check('Number -9007199254740994', new Number(-9007199254740994), compare_obj('Number'));
+// BigInt does not have a non-throwing constructor
+check('BigInt -9007199254740994n', Object(-9007199254740994n), compare_obj('BigInt'));
+
 check('Array Number objects', [new Number(0.2),
                                new Number(0),
                                new Number(-0),
@@ -234,7 +244,7 @@ function compare_RegExp(expected_source) {
   }
 }
 function func_RegExp_flags_lastIndex() {
-  var r = /foo/gim;
+  const r = /foo/gim;
   r.lastIndex = 2;
   return r;
 }
@@ -292,7 +302,7 @@ function b(str) {
 function encode_cesu8(codeunits) {
   // http://www.unicode.org/reports/tr26/ section 2.2
   // only the 3-byte form is supported
-  var rv = [];
+  const rv = [];
   codeunits.forEach(function(codeunit) {
     rv.push(b('11100000') + ((codeunit & b('1111000000000000')) >> 12));
     rv.push(b('10000000') + ((codeunit & b('0000111111000000')) >> 6));
@@ -302,9 +312,9 @@ function encode_cesu8(codeunits) {
 }
 function func_Blob_bytes(arr) {
   return function() {
-    var buffer = new ArrayBuffer(arr.length);
-    var view = new DataView(buffer);
-    for (var i = 0; i < arr.length; ++i) {
+    const buffer = new ArrayBuffer(arr.length);
+    const view = new DataView(buffer);
+    for (let i = 0; i < arr.length; ++i) {
       view.setUint8(i, arr[i]);
     }
     return new Blob([view]);
@@ -361,7 +371,7 @@ function compare_FileList(actual, input, test_obj) {
     test_obj.done();
 }
 function func_FileList_empty() {
-  var input = document.createElement('input');
+  const input = document.createElement('input');
   input.type = 'file';
   return input.files;
 }
@@ -370,14 +380,14 @@ check('Array FileList object, FileList empty', () => ([func_FileList_empty()]),
 check('Object FileList object, FileList empty', () => ({'x':func_FileList_empty()}), compare_Object(enumerate_props(compare_FileList)), true);
 
 function compare_ArrayBufferView(view) {
-  var Type = self[view];
+  const Type = self[view];
   return function(actual, input, test_obj) {
     if (typeof actual === 'string')
       assert_unreached(actual);
     assert_true(actual instanceof Type, 'instanceof '+view);
     assert_equals(actual.length, input.length, 'length');
     assert_not_equals(actual.buffer, input.buffer, 'buffer');
-    for (var i = 0; i < actual.length; ++i) {
+    for (let i = 0; i < actual.length; ++i) {
       assert_equals(actual[i], input[i], 'actual['+i+']');
     }
     if (test_obj)
@@ -395,15 +405,15 @@ function compare_ImageData(actual, input, test_obj) {
     test_obj.done();
 }
 function func_ImageData_1x1_transparent_black() {
-  var canvas = document.createElement('canvas');
-  var ctx = canvas.getContext('2d');
+  const canvas = document.createElement('canvas');
+  const ctx = canvas.getContext('2d');
   return ctx.createImageData(1, 1);
 }
 check('ImageData 1x1 transparent black', func_ImageData_1x1_transparent_black, compare_ImageData, true);
 function func_ImageData_1x1_non_transparent_non_black() {
-  var canvas = document.createElement('canvas');
-  var ctx = canvas.getContext('2d');
-  var imagedata = ctx.createImageData(1, 1);
+  const canvas = document.createElement('canvas');
+  const ctx = canvas.getContext('2d');
+  const imagedata = ctx.createImageData(1, 1);
   imagedata.data[0] = 100;
   imagedata.data[1] = 101;
   imagedata.data[2] = 102;
@@ -419,7 +429,7 @@ check('Object ImageData object, ImageData 1x1 non-transparent non-black', () =>
 
 check('Array sparse', new Array(10), compare_Array(enumerate_props(compare_primitive)));
 check('Array with non-index property', function() {
-  var rv = [];
+  const rv = [];
   rv.foo = 'bar';
   return rv;
 }, compare_Array(enumerate_props(compare_primitive)));
@@ -430,12 +440,12 @@ function check_circular_property(prop) {
   };
 }
 check('Array with circular reference', function() {
-  var rv = [];
+  const rv = [];
   rv[0] = rv;
   return rv;
 }, compare_Array(check_circular_property('0')));
 check('Object with circular reference', function() {
-  var rv = {};
+  const rv = {};
   rv['x'] = rv;
   return rv;
 }, compare_Object(check_circular_property('x')));
@@ -445,11 +455,11 @@ function check_identical_property_values(prop1, prop2) {
   };
 }
 check('Array with identical property values', function() {
-  var obj = {}
+  const obj = {}
   return [obj, obj];
 }, compare_Array(check_identical_property_values('0', '1')));
 check('Object with identical property values', function() {
-  var obj = {}
+  const obj = {}
   return {'x':obj, 'y':obj};
 }, compare_Object(check_identical_property_values('x', 'y')));
 
@@ -459,13 +469,13 @@ function check_absent_property(prop) {
   };
 }
 check('Object with property on prototype', function() {
-  var Foo = function() {};
+  const Foo = function() {};
   Foo.prototype = {'foo':'bar'};
   return new Foo();
 }, compare_Object(check_absent_property('foo')));
 
 check('Object with non-enumerable property', function() {
-  var rv = {};
+  const rv = {};
   Object.defineProperty(rv, 'foo', {value:'bar', enumerable:false, writable:true, configurable:true});
   return rv;
 }, compare_Object(check_absent_property('foo')));
@@ -478,7 +488,7 @@ function check_writable_property(prop) {
   };
 }
 check('Object with non-writable property', function() {
-  var rv = {};
+  const rv = {};
   Object.defineProperty(rv, 'foo', {value:'bar', enumerable:true, writable:false, configurable:true});
   return rv;
 }, compare_Object(check_writable_property('foo')));
@@ -491,7 +501,7 @@ function check_configurable_property(prop) {
   };
 }
 check('Object with non-configurable property', function() {
-  var rv = {};
+  const rv = {};
   Object.defineProperty(rv, 'foo', {value:'bar', enumerable:true, writable:true, configurable:false});
   return rv;
 }, compare_Object(check_configurable_property('foo')));
@@ -500,18 +510,18 @@ check('Object with non-configurable property', function() {
 more substantial changed due to their previous async setup */
 
 function get_canvas_1x1_transparent_black() {
-  var canvas = document.createElement('canvas');
+  const canvas = document.createElement('canvas');
   canvas.width = 1;
   canvas.height = 1;
   return canvas;
 }
 
 function get_canvas_1x1_non_transparent_non_black() {
-  var canvas = document.createElement('canvas');
+  const canvas = document.createElement('canvas');
   canvas.width = 1;
   canvas.height = 1;
-  var ctx = canvas.getContext('2d');
-  var imagedata = ctx.getImageData(0, 0, 1, 1);
+  const ctx = canvas.getContext('2d');
+  const imagedata = ctx.getImageData(0, 0, 1, 1);
   imagedata.data[0] = 100;
   imagedata.data[1] = 101;
   imagedata.data[2] = 102;
@@ -530,7 +540,7 @@ function compare_ImageBitmap(actual, input) {
 structuredCloneBatteryOfTests.push({
   description: 'ImageBitmap 1x1 transparent black',
   async f(runner) {
-    var canvas = get_canvas_1x1_transparent_black();
+    const canvas = get_canvas_1x1_transparent_black();
     const bm = await createImageBitmap(canvas);
     const copy = await runner.structuredClone(bm);
     compare_ImageBitmap(bm, copy);
@@ -541,7 +551,7 @@ structuredCloneBatteryOfTests.push({
 structuredCloneBatteryOfTests.push({
   description: 'ImageBitmap 1x1 non-transparent non-black',
   async f(runner) {
-    var canvas = get_canvas_1x1_non_transparent_non_black();
+    const canvas = get_canvas_1x1_non_transparent_non_black();
     const bm = await createImageBitmap(canvas);
     const copy = await runner.structuredClone(bm);
     compare_ImageBitmap(bm, copy);
@@ -552,7 +562,7 @@ structuredCloneBatteryOfTests.push({
 structuredCloneBatteryOfTests.push({
   description: 'Array ImageBitmap object, ImageBitmap 1x1 transparent black',
   async f(runner) {
-    var canvas = get_canvas_1x1_transparent_black();
+    const canvas = get_canvas_1x1_transparent_black();
     const bm = [await createImageBitmap(canvas)];
     const copy = await runner.structuredClone(bm);
     compare_Array(enumerate_props(compare_ImageBitmap))(bm, copy);
@@ -563,7 +573,7 @@ structuredCloneBatteryOfTests.push({
 structuredCloneBatteryOfTests.push({
   description: 'Array ImageBitmap object, ImageBitmap 1x1 transparent non-black',
   async f(runner) {
-    var canvas = get_canvas_1x1_non_transparent_non_black();
+    const canvas = get_canvas_1x1_non_transparent_non_black();
     const bm = [await createImageBitmap(canvas)];
     const copy = await runner.structuredClone(bm);
     compare_Array(enumerate_props(compare_ImageBitmap))(bm, copy);
@@ -574,7 +584,7 @@ structuredCloneBatteryOfTests.push({
 structuredCloneBatteryOfTests.push({
   description: 'Object ImageBitmap object, ImageBitmap 1x1 transparent black',
   async f(runner) {
-    var canvas = get_canvas_1x1_transparent_black();
+    const canvas = get_canvas_1x1_transparent_black();
     const bm = {x: await createImageBitmap(canvas)};
     const copy = await runner.structuredClone(bm);
     compare_Object(enumerate_props(compare_ImageBitmap))(bm, copy);
@@ -585,7 +595,7 @@ structuredCloneBatteryOfTests.push({
 structuredCloneBatteryOfTests.push({
   description: 'Object ImageBitmap object, ImageBitmap 1x1 transparent non-black',
   async f(runner) {
-    var canvas = get_canvas_1x1_non_transparent_non_black();
+    const canvas = get_canvas_1x1_non_transparent_non_black();
     const bm = {x: await createImageBitmap(canvas)};
     const copy = await runner.structuredClone(bm);
     compare_Object(enumerate_props(compare_ImageBitmap))(bm, copy);
diff --git a/tests/wpt/web-platform-tests/installedapp/idlharness.https.window.js b/tests/wpt/web-platform-tests/installedapp/idlharness.https.window.js
index 3988dba414a..7774da6803d 100644
--- a/tests/wpt/web-platform-tests/installedapp/idlharness.https.window.js
+++ b/tests/wpt/web-platform-tests/installedapp/idlharness.https.window.js
@@ -1,30 +1,18 @@
 // META: global=window
 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
+// META: timeout=long
 
 'use strict';
 
 // https://wicg.github.io/get-installed-related-apps/spec/
 
-const idl = `
-dictionary RelatedApplication {
-  required USVString platform;
-  USVString url;
-  DOMString id;
-  USVString version;
-};
-
-[Exposed=Window]
-partial interface Navigator {
-  [SecureContext] Promise<sequence<RelatedApplication>> getInstalledRelatedApps();
-};`;
-
-test(t => {
-  const idl_array = new IdlArray();
-  idl_array.add_untested_idls("interface Navigator {};");
-  idl_array.add_idls(idl);
-  idl_array.add_objects({
-    Navigator: ['navigator'],
-  });
-  idl_array.test();
-}, 'IDL test for getInstalledRelatedApps');
+idl_test(
+  ['get-installed-related-apps'],
+  ['html'],
+  idl_array => {
+    idl_array.add_objects({
+      Navigator: ['navigator'],
+    });
+  }
+)
diff --git a/tests/wpt/web-platform-tests/interfaces/BackgroundSync.idl b/tests/wpt/web-platform-tests/interfaces/BackgroundSync.idl
index f84faf7bcd3..c52dcdb8984 100644
--- a/tests/wpt/web-platform-tests/interfaces/BackgroundSync.idl
+++ b/tests/wpt/web-platform-tests/interfaces/BackgroundSync.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into reffy-reports
 // (https://github.com/tidoust/reffy-reports)
-// Source: Web Background Synchronization (https://wicg.github.io/BackgroundSync/spec/)
+// Source: Web Background Synchronization (https://wicg.github.io/background-sync/spec/)
 
 partial interface ServiceWorkerRegistration {
   readonly attribute SyncManager sync;
@@ -17,8 +17,9 @@ partial interface ServiceWorkerGlobalScope {
   attribute EventHandler onsync;
 };
 
-[Constructor(DOMString type, SyncEventInit init), Exposed=ServiceWorker]
+[Exposed=ServiceWorker]
 interface SyncEvent : ExtendableEvent {
+  constructor(DOMString type, SyncEventInit init);
   readonly attribute DOMString tag;
   readonly attribute boolean lastChance;
 };
diff --git a/tests/wpt/web-platform-tests/interfaces/compression.idl b/tests/wpt/web-platform-tests/interfaces/compression.idl
new file mode 100644
index 00000000000..47d2b9e48d0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/interfaces/compression.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: Compression Streams (https://wicg.github.io/compression/)
+
+interface mixin GenericTransformStream {
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+};
+
+[Exposed=(Window,Worker)]
+interface CompressionStream {
+  constructor(DOMString format);
+};
+CompressionStream includes GenericTransformStream;
+
+[Exposed=(Window,Worker)]
+interface DecompressionStream {
+  constructor(DOMString format);
+};
+DecompressionStream includes GenericTransformStream;
diff --git a/tests/wpt/web-platform-tests/interfaces/get-installed-related-apps.idl b/tests/wpt/web-platform-tests/interfaces/get-installed-related-apps.idl
new file mode 100644
index 00000000000..cbea101d300
--- /dev/null
+++ b/tests/wpt/web-platform-tests/interfaces/get-installed-related-apps.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: Get Installed Related Apps API (https://wicg.github.io/get-installed-related-apps/spec/)
+
+dictionary RelatedApplication {
+    required USVString platform;
+    USVString url;
+    DOMString id;
+    USVString version;
+};
+
+[Exposed=Window]
+partial interface Navigator {
+  [SecureContext] Promise<sequence<RelatedApplication>> getInstalledRelatedApps();
+};
diff --git a/tests/wpt/web-platform-tests/interfaces/html.idl b/tests/wpt/web-platform-tests/interfaces/html.idl
index 7b2a96ce676..09e1a29043b 100644
--- a/tests/wpt/web-platform-tests/interfaces/html.idl
+++ b/tests/wpt/web-platform-tests/interfaces/html.idl
@@ -194,6 +194,7 @@ interface HTMLLinkElement : HTMLElement {
   [CEReactions] attribute USVString imageSrcset;
   [CEReactions] attribute DOMString imageSizes;
   [CEReactions] attribute DOMString referrerPolicy;
+  [CEReactions] attribute boolean disabled;
 };
 HTMLLinkElement includes LinkStyle;
 
diff --git a/tests/wpt/web-platform-tests/intersection-observer/isIntersecting-threshold.html b/tests/wpt/web-platform-tests/intersection-observer/isIntersecting-threshold.html
index 106b65edd75..842c8e2c9f9 100644
--- a/tests/wpt/web-platform-tests/intersection-observer/isIntersecting-threshold.html
+++ b/tests/wpt/web-platform-tests/intersection-observer/isIntersecting-threshold.html
@@ -43,7 +43,8 @@ function step3() {
   assert_equals(entries.length, 2);
   assert_true(entries[1].intersectionRatio >= 0.5 &&
               entries[1].intersectionRatio < 1);
-  assert_equals(entries[1].isIntersecting, true);
+  // See https://github.com/w3c/IntersectionObserver/issues/432
+  assert_equals(entries[1].isIntersecting, false);
   scroller.scrollTop = 100;
 }
 
diff --git a/tests/wpt/web-platform-tests/lint.ignore b/tests/wpt/web-platform-tests/lint.ignore
index 776c6332900..078a706f079 100644
--- a/tests/wpt/web-platform-tests/lint.ignore
+++ b/tests/wpt/web-platform-tests/lint.ignore
@@ -710,6 +710,7 @@ MISSING DEPENDENCY: webxr/resources/webxr_util.js
 MISSING DEPENDENCY: contacts/resources/helpers.js
 MISSING DEPENDENCY: generic-sensor/resources/generic-sensor-helpers.js
 MISSING DEPENDENCY: orientation-event/resources/orientation-event-helpers.js
+MISSING DEPENDENCY: screen_enumeration/resources/screenenumeration-helpers.js
 
 # Tests that are false positives for using Ahem as a system font
 AHEM SYSTEM FONT: acid/acid3/test.html
diff --git a/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js
new file mode 100644
index 00000000000..0f71db8f506
--- /dev/null
+++ b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js
@@ -0,0 +1,82 @@
+'use strict'
+
+var ScreenEnumerationTest = (() => {
+
+  class MockScreenEnumeration {
+    constructor() {
+      this.bindingSet_ = new mojo.BindingSet(blink.mojom.ScreenEnumeration);
+      this.interceptor_ = new MojoInterfaceInterceptor(blink.mojom.ScreenEnumeration.name);
+      this.interceptor_.oninterfacerequest = e => {
+        this.bindingSet_.addBinding(this, e.handle);
+      }
+      this.reset();
+      this.interceptor_.start();
+    }
+
+    reset() {
+      this.displays_ = [];
+      this.internalId_ = 0;
+      this.primaryId_ = 0;
+      this.success_ = false;
+    }
+
+    setIds(internalId, primaryId) {
+      this.internalId_ = internalId;
+      this.primaryId_ = primaryId;
+    }
+
+    setSuccess(success) {
+      this.success_ = success;
+    }
+
+    addDisplay(display) {
+      this.displays_.push(display);
+    }
+
+    async getDisplays() {
+      return Promise.resolve({
+        displays: this.displays_,
+        internalId: this.internalId_,
+        primaryId: this.primaryId_,
+        success: this.success_,
+      });
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockScreenEnumeration: null
+  }
+
+  class ScreenEnumerationTestChromium {
+    constructor() {
+      Object.freeze(this); // Makes it immutable.
+    }
+
+    async initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      if (testInternal.mockScreenEnumeration == null)
+        testInternal.mockScreenEnumeration = new MockScreenEnumeration();
+      testInternal.initialized = true;
+    }
+
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.mockScreenEnumeration.reset();
+      testInternal.initialized = false;
+
+      // Wait for an event loop iteration to let any pending mojo commands
+      // to finish.
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    getMockScreenEnumeration() {
+      return testInternal.mockScreenEnumeration;
+    }
+  }
+
+  return ScreenEnumerationTestChromium;
+})();
diff --git a/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js.header b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js.header
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/resources/chromium/mock-screenenumeration.js.header
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/tests/wpt/web-platform-tests/resources/chromium/webxr-test-math-helper.js b/tests/wpt/web-platform-tests/resources/chromium/webxr-test-math-helper.js
index 14e16371267..22c6c12d08f 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/webxr-test-math-helper.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/webxr-test-math-helper.js
@@ -239,6 +239,52 @@ class XRMathHelper {
     return result;
   }
 
+  // Decomposes a matrix, with the assumption that the passed in matrix is
+  // a rigid transformation (i.e. position and rotation *only*!).
+  // The result is an object with `position` and `orientation` keys, which should
+  // be compatible with FakeXRRigidTransformInit.
+  // The implementation should match the behavior of gfx::Transform, but assumes
+  // that scale, skew & perspective are not present in the matrix so it could be
+  // simplified.
+  static decomposeRigidTransform(m) {
+    const m00 = m[0],  m01 = m[1],  m02 = m[2],  m03 = m[3];
+    const m10 = m[4],  m11 = m[5],  m12 = m[6],  m13 = m[7];
+    const m20 = m[8],  m21 = m[9],  m22 = m[10], m23 = m[11];
+    const m30 = m[12], m31 = m[13], m32 = m[14], m33 = m[15];
+
+    const position = [m30, m31, m32];
+    const orientation = [0, 0, 0, 0];
+
+    const trace = m00 + m11 + m22;
+    if (trace > 0) {
+      const S = Math.sqrt(trace + 1) * 2;
+      orientation[3] = 0.25 * S;
+      orientation[0] = (m12 - m21) / S;
+      orientation[1] = (m20 - m02) / S;
+      orientation[2] = (m01 - m10) / S;
+    } else if (m00 > m11 && m00 > m22) {
+      const S = Math.sqrt(1.0 + m00 - m11 - m22) * 2;
+      orientation[3] = (m12 - m21) / S;
+      orientation[0] = 0.25 * S;
+      orientation[1] = (m01 + m10) / S;
+      orientation[2] = (m20 + m02) / S;
+    } else if (m11 > m22) {
+      const S = Math.sqrt(1.0 + m11 - m00 - m22) * 2;
+      orientation[3] = (m20 - m02) / S;
+      orientation[0] = (m01 + m10) / S;
+      orientation[1] = 0.25 * S;
+      orientation[2] = (m12 + m21) / S;
+    } else {
+      const S = Math.sqrt(1.0 + m22 - m00 - m11) * 2;
+      orientation[3] = (m01 - m10) / S;
+      orientation[0] = (m20 + m02) / S;
+      orientation[1] = (m12 + m21) / S;
+      orientation[2] = 0.25 * S;
+    }
+
+    return { position, orientation };
+  }
+
   static identity() {
     return [
       1, 0, 0, 0,
diff --git a/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js b/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
index 4809ac86bd3..adbb42eed8b 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
@@ -201,9 +201,115 @@ class MockVRService {
   }
 }
 
+class FakeXRAnchorController {
+  constructor() {
+    // Private properties.
+    this.device_ = null;
+    this.id_ = null;
+    this.dirty_ = true;
+
+    // Properties backing up public attributes / methods.
+    this.deleted_ = false;
+    this.paused_ = false;
+    this.anchorOrigin_ = XRMathHelper.identity();
+  }
+
+  get deleted() {
+    return this.deleted_;
+  }
+
+  pauseTracking() {
+    if(!this.paused_) {
+      this.paused_ = true;
+      this.dirty_ = true;
+    }
+  }
+
+  resumeTracking() {
+    if(this.paused_) {
+      this.paused_ = false;
+      this.dirty_ = true;
+    }
+  }
+
+  stopTracking() {
+    if(!this.deleted_) {
+      this.device_.deleteAnchorController(this.id_);
+
+      this.deleted_ = true;
+      this.dirty_ = true;
+    }
+  }
+
+  setAnchorOrigin(anchorOrigin) {
+    this.anchorOrigin_ = getMatrixFromTransform(anchorOrigin);
+    this.dirty_ = true;
+  }
+
+  // Internal implementation:
+  set id(value) {
+    this.id_ = value;
+  }
+
+  set device(value) {
+    this.device_ = value;
+  }
+
+  get dirty() {
+    return this.dirty_;
+  }
+
+  markProcessed() {
+    this.dirty_ = false;
+  }
+
+  getAnchorOrigin() {
+    return this.anchorOrigin_;
+  }
+}
+
+class FakeXRAnchorCreationEvent extends Event {
+  constructor(type, eventInitDict) {
+    super(type, eventInitDict);
+
+    this.success_ = false;
+    this.requestedAnchorOrigin_ = {};
+    this.isAttachedToEntity_ = false;
+    this.anchorController_ = new FakeXRAnchorController();
+
+    if(eventInitDict.requestedAnchorOrigin != null) {
+      this.requestedAnchorOrigin_ = eventInitDict.requestedAnchorOrigin;
+    }
+
+    if(eventInitDict.isAttachedToEntity != null) {
+      this.isAttachedToEntity_ = eventInitDict.isAttachedToEntity;
+    }
+  }
+
+  get requestedAnchorOrigin() {
+    return this.requestedAnchorOrigin_;
+  }
+
+  get isAttachedToEntity() {
+    return this.isAttachedToEntity_;
+  }
+
+  get success() {
+    return this.success_;
+  }
+
+  set success(value) {
+    this.success_ = value;
+  }
+
+  get anchorController() {
+    return this.anchorController_;
+  }
+}
+
 // Implements XRFrameDataProvider and XRPresentationProvider. Maintains a mock
-// for XRPresentationProvider.
-class MockRuntime {
+// for XRPresentationProvider. Implements FakeXRDevice test API.
+class MockRuntime extends EventTarget {
   // Mapping from string feature names to the corresponding mojo types.
   // This is exposed as a member for extensibility.
   static featureToMojoMap = {
@@ -215,6 +321,7 @@ class MockRuntime {
     'hit-test': device.mojom.XRSessionFeature.HIT_TEST,
     'dom-overlay': device.mojom.XRSessionFeature.DOM_OVERLAY,
     'light-estimation': device.mojom.XRSessionFeature.LIGHT_ESTIMATION,
+    'anchors': device.mojom.XRSessionFeature.ANCHORS,
   };
 
   static sessionModeToMojoMap = {
@@ -224,6 +331,8 @@ class MockRuntime {
   };
 
   constructor(fakeDeviceInit, service) {
+    super();
+
     this.sessionClient_ = new device.mojom.XRSessionClientPtr();
     this.presentation_provider_ = new MockXRPresentationProvider();
 
@@ -248,6 +357,10 @@ class MockRuntime {
     // ID of the next subscription to be assigned.
     this.next_hit_test_id_ = 1;
 
+    this.anchor_controllers_ = new Map();
+    // ID of the next anchor to be assigned.
+    this.next_anchor_id_ = 1;
+
     let supportedModes = [];
     if (fakeDeviceInit.supportedModes) {
       supportedModes = fakeDeviceInit.supportedModes.slice();
@@ -571,6 +684,11 @@ class MockRuntime {
     this.input_sources_.delete(source.source_id_);
   }
 
+  // These methods are intended to be used by FakeXRAnchorController only.
+  deleteAnchorController(controllerId) {
+    this.anchor_controllers_.delete(controllerId);
+  }
+
   // Extension point for non-standard modules.
 
   _injectAdditionalFrameData(options, frameData) {
@@ -623,6 +741,8 @@ class MockRuntime {
 
     this._calculateHitTestResults(frameData);
 
+    this._calculateAnchorInformation(frameData);
+
     this._injectAdditionalFrameData(options, frameData);
 
     return Promise.resolve({
@@ -662,25 +782,7 @@ class MockRuntime {
       });
     }
 
-    if (nativeOriginInformation.$tag == device.mojom.XRNativeOriginInformation.Tags.inputSourceId) {
-      if (!this.input_sources_.has(nativeOriginInformation.inputSourceId)) {
-        // Reject - unknown input source ID.
-        return Promise.resolve({
-          result : device.mojom.SubscribeToHitTestResult.FAILURE_GENERIC,
-          subscriptionId : 0
-        });
-      }
-    } else if (nativeOriginInformation.$tag == device.mojom.XRNativeOriginInformation.Tags.referenceSpaceCategory) {
-      // Bounded_floor & unbounded ref spaces are not yet supported for AR:
-      if (nativeOriginInformation.referenceSpaceCategory == device.mojom.XRReferenceSpaceCategory.UNBOUNDED
-       || nativeOriginInformation.referenceSpaceCategory == device.mojom.XRReferenceSpaceCategory.BOUNDED_FLOOR) {
-        return Promise.resolve({
-          result : device.mojom.SubscribeToHitTestResult.FAILURE_GENERIC,
-          subscriptionId : 0
-        });
-      }
-    } else {
-      // Planes and anchors are not yet supported by the mock interface.
+    if (!this._nativeOriginKnown(nativeOriginInformation)) {
       return Promise.resolve({
         result : device.mojom.SubscribeToHitTestResult.FAILURE_GENERIC,
         subscriptionId : 0
@@ -716,6 +818,65 @@ class MockRuntime {
     });
   }
 
+  createAnchor(nativeOriginInformation, nativeOriginFromAnchor) {
+    return new Promise((resolve) => {
+      const mojoFromNativeOrigin = this._getMojoFromNativeOrigin(nativeOriginInformation);
+      if(mojoFromNativeOrigin == null) {
+        resolve({
+          result : device.mojom.CreateAnchorResult.FAILURE,
+          anchorId : 0
+        });
+
+        return;
+      }
+
+      const mojoFromAnchor = XRMathHelper.mul4x4(mojoFromNativeOrigin, nativeOriginFromAnchor);
+
+      const createAnchorEvent = new FakeXRAnchorCreationEvent("anchorcreate", {
+        requestedAnchorOrigin: mojoFromAnchor,
+        isAttachedToEntity: false,
+      });
+
+      this.dispatchEvent(createAnchorEvent);
+
+      if(createAnchorEvent.success) {
+        let anchor_controller = createAnchorEvent.anchorController;
+        const anchor_id = this.next_anchor_id_;
+        this.next_anchor_id_++;
+
+        // If the test allowed the anchor creation,
+        // store the anchor controller & return success.
+        this.anchor_controllers_.set(anchor_id, anchor_controller);
+        anchor_controller.device = this;
+        anchor_controller.id = anchor_id;
+
+        resolve({
+          result : device.mojom.CreateAnchorResult.SUCCESS,
+          anchorId : anchor_id
+        });
+
+        return;
+      }
+
+      resolve({
+        result : device.mojom.CreateAnchorResult.FAILURE,
+        anchorId : 0
+      });
+    });
+  }
+
+  createPlaneAnchor(planeFromAnchor, planeId) {
+    return new Promise((resolve) => {
+
+      // Not supported yet.
+
+      resolve({
+        result : device.mojom.CreateAnchorResult.FAILURE,
+        anchorId : 0
+      });
+    });
+  }
+
   // Utility function
   requestRuntimeSession(sessionOptions) {
     return this.runtimeSupportsSession(sessionOptions).then((result) => {
@@ -777,6 +938,61 @@ class MockRuntime {
     });
   }
 
+  // Private functions - utilities:
+  _nativeOriginKnown(nativeOriginInformation){
+
+    if (nativeOriginInformation.$tag == device.mojom.XRNativeOriginInformation.Tags.inputSourceId) {
+      if (!this.input_sources_.has(nativeOriginInformation.inputSourceId)) {
+        // Unknown input source.
+        return false;
+      }
+
+      return true;
+    } else if (nativeOriginInformation.$tag == device.mojom.XRNativeOriginInformation.Tags.referenceSpaceCategory) {
+      // Bounded_floor & unbounded ref spaces are not yet supported for AR:
+      if (nativeOriginInformation.referenceSpaceCategory == device.mojom.XRReferenceSpaceCategory.UNBOUNDED
+       || nativeOriginInformation.referenceSpaceCategory == device.mojom.XRReferenceSpaceCategory.BOUNDED_FLOOR) {
+        return false;
+      }
+
+      return true;
+    } else {
+      // Planes and anchors are not yet supported by the mock interface.
+      return false;
+    }
+  }
+
+  // Private functions - anchors implementation:
+
+  // Modifies passed in frameData to add anchor information.
+  _calculateAnchorInformation(frameData) {
+    if (!this.supportedModes_.includes(device.mojom.XRSessionMode.kImmersiveAr)) {
+      return;
+    }
+
+    frameData.anchorsData = new device.mojom.XRAnchorsData();
+    frameData.anchorsData.allAnchorsIds = [];
+    frameData.anchorsData.updatedAnchorsData = [];
+
+    for(const [id, controller] of this.anchor_controllers_) {
+      frameData.anchorsData.allAnchorsIds.push(id);
+
+      // Send the entire anchor data over if there was a change since last GetFrameData().
+      if(controller.dirty) {
+        const anchorData = new device.mojom.XRAnchorData();
+        anchorData.id = id;
+        if(!controller.paused) {
+          anchorData.pose = XRMathHelper.decomposeRigidTransform(
+            controller.getAnchorOrigin());
+        }
+
+        controller.markProcessed();
+
+        frameData.anchorsData.updatedAnchorsData.push(anchorData);
+      }
+    }
+  }
+
   // Private functions - hit test implementation:
 
   // Modifies passed in frameData to add hit test results.
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/README.md b/tests/wpt/web-platform-tests/screen_enumeration/README.md
new file mode 100644
index 00000000000..04b2ecce7c2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/screen_enumeration/README.md
@@ -0,0 +1,32 @@
+The `screenenumeration-helpers.js` requires an implementation of the
+`ScreenEnumerationTest` interfaces, which should emulate screen enumeration
+backends.
+
+The `ScreenEnumerationTest` interface is defined as:
+
+```
+  class ScreenEnumerationTestChromium {
+    initialize();  // Sets up the testing environment.
+    async reset(); // Frees the resources.
+    getMockScreenEnumeration(); // Returns `MockScreenEnumeration` interface.
+  };
+
+  class MockScreenEnumeration {
+    reset(); Empties data of created mock displays.
+    setId(internalId, primaryId); // Set primary screen and internal screen IDs.
+    setSuccess(success); // Set boolean to validate getDisplays() returned values.
+    addDisplay(display); // Push display to the display vector.
+    async getDisplays(); // Interceptor of getDisplays (screen_enumeration.mojom).
+  };
+```
+
+Other helper-functions are located in screenenumeration-helpers.js
+```
+makeDisplay(id, bounds, work_area, scale_factor); // Create display object.
+```
+
+The Chromium implementation of the `ScreenEnumerationTest` interface is located
+in [mock-screenenumeration.js](../resources/chromium/mock-screenenumeration.js).
+
+Other browser vendors should provide their own implementations of
+the `ScreenEnumerationTest` interfaces.
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/getScreens.tentative.https.window.js b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.tentative.https.window.js
index 76223b7907c..f496282b016 100644
--- a/tests/wpt/web-platform-tests/screen_enumeration/getScreens.tentative.https.window.js
+++ b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.tentative.https.window.js
@@ -1,36 +1,36 @@
-// META: global=window,dedicatedworker,sharedworker,serviceworker
+// META: global=window
 // META: script=/resources/testdriver.js
 // META: script=/resources/testdriver-vendor.js
-'use strict';
+"use strict";
 
 promise_test(async testCase => {
-  assert_equals(typeof self.getScreens, 'function');
-}, 'self.getScreens is present');
+  assert_equals(typeof self.getScreens, "function");
+}, "self.getScreens is present");
 
 promise_test(async testCase => {
-  await test_driver.set_permission({name: 'window-placement'}, 'granted');
+  await test_driver.set_permission({name: "window-placement"}, "granted");
   const screens = await self.getScreens();
   assert_greater_than(screens.length, 0);
 
-  assert_equals(typeof screens[0].availWidth, 'number');
-  assert_equals(typeof screens[0].availHeight, 'number');
-  assert_equals(typeof screens[0].width, 'number');
-  assert_equals(typeof screens[0].height, 'number');
-  assert_equals(typeof screens[0].colorDepth, 'number');
-  assert_equals(typeof screens[0].pixelDepth, 'number');
+  assert_equals(typeof screens[0].availWidth, "number");
+  assert_equals(typeof screens[0].availHeight, "number");
+  assert_equals(typeof screens[0].width, "number");
+  assert_equals(typeof screens[0].height, "number");
+  assert_equals(typeof screens[0].colorDepth, "number");
+  assert_equals(typeof screens[0].pixelDepth, "number");
 
-  assert_equals(typeof screens[0].availLeft, 'number');
-  assert_equals(typeof screens[0].availTop, 'number');
-  assert_equals(typeof screens[0].left, 'number');
-  assert_equals(typeof screens[0].top, 'number');
-  assert_equals(typeof screens[0].orientation, 'object');
+  assert_equals(typeof screens[0].availLeft, "number");
+  assert_equals(typeof screens[0].availTop, "number");
+  assert_equals(typeof screens[0].left, "number");
+  assert_equals(typeof screens[0].top, "number");
+  assert_equals(typeof screens[0].orientation, "object");
 
-  assert_equals(typeof screens[0].primary, 'boolean');
-  assert_equals(typeof screens[0].internal, 'boolean');
-  assert_equals(typeof screens[0].scaleFactor, 'number');
-  assert_equals(typeof screens[0].id, 'string');
-  assert_equals(typeof screens[0].touchSupport, 'boolean');
-}, 'self.getScreens returns at least 1 Screen with permission granted');
+  assert_equals(typeof screens[0].primary, "boolean");
+  assert_equals(typeof screens[0].internal, "boolean");
+  assert_equals(typeof screens[0].scaleFactor, "number");
+  assert_equals(typeof screens[0].id, "string");
+  assert_equals(typeof screens[0].touchSupport, "boolean");
+}, "self.getScreens returns at least 1 Screen with permission granted");
 
 promise_test(async testCase => {
   await test_driver.set_permission({name: 'window-placement'}, 'denied');
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html
new file mode 100644
index 00000000000..5ce54839dee
--- /dev/null
+++ b/tests/wpt/web-platform-tests/screen_enumeration/getScreens.values.https.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Screen Enumeration: getScreens() tentative</title>
+<!-- TODO: update link to W3C whenever specifications are ready -->
+<link rel="help" href="https://github.com/webscreens/screen-enumeration"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/screenenumeration-helpers.js"></script>
+<script>
+
+"use strict";
+
+screen_enumeration_test(async (t, mockScreenEnum) => {
+  let display1 = makeDisplay(10,
+                             {x: 0, y: 10, width: 1200, height: 800},
+                             {x: 20, y: 30, width: 1000, height: 600},
+                             1.0);
+
+  mockScreenEnum.addDisplay(display1);
+  mockScreenEnum.setIds(mockScreenEnum.displays_[0].id, mockScreenEnum.displays_[0].id);
+  mockScreenEnum.setSuccess(true);
+
+  // Grant window-placement permissions for testdriver.
+  await test_driver.set_permission({name: "window-placement"}, "granted");
+
+  // This call is calling GetDisplays, which should fall in interceptor.
+  const screens = await self.getScreens();
+
+  assert_equals(screens.length, 1);
+
+  assert_equals(screens[0].left, 0);
+  assert_equals(screens[0].top, 10);
+  assert_equals(screens[0].width, 1200);
+  assert_equals(screens[0].height, 800);
+  assert_equals(screens[0].availLeft, 20);
+  assert_equals(screens[0].availTop, 30);
+  assert_equals(screens[0].availWidth, 1000);
+  assert_equals(screens[0].availHeight, 600);
+  assert_equals(screens[0].primary, true);
+  assert_equals(screens[0].internal, true);
+  assert_equals(screens[0].scaleFactor, 1.0);
+  assert_equals(screens[0].id, "0");
+}, "getScreens() returns a single mocked screen");
+</script>
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/resources/screenenumeration-helpers.js b/tests/wpt/web-platform-tests/screen_enumeration/resources/screenenumeration-helpers.js
new file mode 100644
index 00000000000..d96fca74b5d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/screen_enumeration/resources/screenenumeration-helpers.js
@@ -0,0 +1,131 @@
+"use strict";
+
+// In Chromium-based browsers this implementation is provided by a polyfill
+// in order to reduce the amount of test-only code shipped to users. To enable
+// these tests the browser must be run with these options:
+//
+//   --enable-blink-features=MojoJS,MojoJSTest
+
+const loadChromiumResources = async () => {
+  if (!("MojoInterfaceInterceptor" in self)) {
+    // Do nothing on non-Chromium-based browsers or when the Mojo bindings are
+    // not present in the global namespace.
+    return;
+  }
+
+  const resources = [
+    "/gen/layout_test_data/mojo/public/js/mojo_bindings.js",
+    "/gen/ui/gfx/mojom/color_space.mojom.js",
+    "/gen/ui/gfx/mojom/buffer_types.mojom.js",
+    "/gen/ui/gfx/mojom/display_color_spaces.mojom.js",
+    "/gen/ui/gfx/geometry/mojom/geometry.mojom.js",
+    "/gen/ui/display/mojom/display.mojom.js",
+    "/gen/third_party/blink/public/mojom/screen_enumeration/screen_enumeration.mojom.js",
+    "/resources/testdriver.js",
+    "/resources/testdriver-vendor.js",
+    "/resources/chromium/mock-screenenumeration.js",
+  ];
+  await Promise.all(resources.map(path => {
+    const script = document.createElement("script");
+    script.src = path;
+    script.async = false;
+    const promise = new Promise((resolve, reject) => {
+      script.onload = resolve;
+      script.onerror = reject;
+    });
+    document.head.appendChild(script);
+    return promise;
+  }));
+
+};
+
+async function initialize_screen_enumeration_tests() {
+  if (typeof ScreenEnumerationTest === "undefined")
+    await loadChromiumResources();
+
+  assert_true(typeof ScreenEnumerationTest !== "undefined",
+              "Screen Enumeration testing interface is not available.");
+  let enumTest = new ScreenEnumerationTest();
+  await enumTest.initialize();
+  return enumTest;
+}
+
+function screen_enumeration_test(func, name, properties) {
+  promise_test(async t => {
+    let enumTest = await initialize_screen_enumeration_tests();
+    t.add_cleanup(enumTest.reset);
+    await func(t, enumTest.getMockScreenEnumeration());
+  }, name, properties);
+}
+
+// Construct a mock display with provided properties
+function makeDisplay(id, bounds, work_area, scale_factor) {
+  let myColorSpace = fillColorSpaceVector();
+  let myBufferFormat = fillBufferFormatVector();
+  let newDisplay = new display.mojom.Display({id: id,
+                          bounds: new gfx.mojom.Rect({x: bounds.x, y: bounds.y,
+                                                      width: bounds.width,
+                                                      height: bounds.height}),
+                          sizeInPixels: new gfx.mojom.Size({width: bounds.width,
+                                                            height: bounds.height}),
+                          maximumCursorSize: new gfx.mojom.Size({width: 20, height: 20}),
+                          workArea: new gfx.mojom.Rect({x: work_area.x, y: work_area.y,
+                                                        width: work_area.width,
+                                                        height: work_area.height}),
+                          deviceScaleFactor: scale_factor,
+                          rotation: display.mojom.Rotation.VALUE_0,
+                          touchSupport: display.mojom.TouchSupport.UNAVAILABLE,
+                          accelerometerSupport: display.mojom.AccelerometerSupport.UNAVAILABLE,
+                          colorSpaces: new gfx.mojom.DisplayColorSpaces({colorSpaces: myColorSpace,
+                                                                         bufferFormats: myBufferFormat,
+                                                                         sdrWhiteLevel: 1.0}),
+                          colorDepth: 10,
+                          depthPerComponent: 10,
+                          isMonochrome: true,
+                          displayFrequency: 120});
+  return newDisplay;
+}
+
+// Function to construct color space vector.
+// Values are purely random but mandatory.
+function fillColorSpaceVector() {
+  let colorSpaceVector = [];
+  for (let i = 0; i < 6; i++) {
+    let colorSpace = new gfx.mojom.ColorSpace({
+                       primaries: gfx.mojom.ColorSpacePrimaryID.BT709,
+                       transfer: gfx.mojom.ColorSpaceTransferID.BT709,
+                       matrix: gfx.mojom.ColorSpaceMatrixID.BT709,
+                       range: gfx.mojom.ColorSpaceRangeID.LIMITED,
+                       customPrimaryMatrix: fillCustomPrimaryMatrix(),
+                       transferParams: fillTransferParams()});
+    colorSpaceVector.push(colorSpace);
+  }
+  return colorSpaceVector;
+}
+
+function fillCustomPrimaryMatrix () {
+  let matrix = [1.1, 1.2, 1.3,
+                2.1, 2.2, 2.3,
+                3.1, 3.2, 3.3];
+  return matrix;
+}
+
+function fillTransferParams () {
+  let params = [1.1, 1.2, 1.3,
+                2.1, 2.2, 2.3,
+                3.1];
+  return params;
+}
+
+// Function to construct buffer format vector.
+// Values are purely random but mandatory.
+function fillBufferFormatVector() {
+
+  let bufferFormat = [gfx.mojom.BufferFormat.RGBA_8888,
+                      gfx.mojom.BufferFormat.RGBA_8888,
+                      gfx.mojom.BufferFormat.RGBA_8888,
+                      gfx.mojom.BufferFormat.RGBA_8888,
+                      gfx.mojom.BufferFormat.RGBA_8888,
+                      gfx.mojom.BufferFormat.RGBA_8888];
+  return bufferFormat;
+}
diff --git a/tests/wpt/web-platform-tests/screen_enumeration/screen_enumeration_permission.window.js b/tests/wpt/web-platform-tests/screen_enumeration/screen_enumeration_permission.window.js
new file mode 100644
index 00000000000..00adbfc52ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/screen_enumeration/screen_enumeration_permission.window.js
@@ -0,0 +1,20 @@
+// META: global=window
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+"use strict";
+
+promise_test(async t => {
+  await test_driver.set_permission({ name: "window-placement" }, "denied", false);
+
+  const status = await navigator.permissions.query({ name:"window-placement" });
+  assert_class_string(status, "PermissionStatus");
+  assert_equals(status.state, "denied");
+}, "Deny window placement permission should work.");
+
+promise_test(async t => {
+  await test_driver.set_permission({ name: "window-placement" }, "granted", false);
+
+  const status = await navigator.permissions.query({ name: "window-placement" });
+  assert_class_string(status, "PermissionStatus");
+  assert_equals(status.state, "granted");
+}, "Grant window placement permission should work.");
diff --git a/tests/wpt/web-platform-tests/tools/quic/commands.json b/tests/wpt/web-platform-tests/tools/quic/commands.json
index 044322eed3b..d4e3ce81280 100644
--- a/tests/wpt/web-platform-tests/tools/quic/commands.json
+++ b/tests/wpt/web-platform-tests/tools/quic/commands.json
@@ -1,10 +1,10 @@
 {
-  "servequic": {
+  "serve-quic-transport": {
     "path": "serve.py",
     "script": "run",
     "parser": "get_parser",
     "py3only": true,
-    "help": "Start the QUIC server",
+    "help": "Start the QUIC server for WebTransport",
     "virtualenv": true,
     "requirements": [
       "requirements.txt"
diff --git a/tests/wpt/web-platform-tests/tools/quic/quic_transport_server.py b/tests/wpt/web-platform-tests/tools/quic/quic_transport_server.py
index 9a04ad17f19..deef46fb8a7 100644
--- a/tests/wpt/web-platform-tests/tools/quic/quic_transport_server.py
+++ b/tests/wpt/web-platform-tests/tools/quic/quic_transport_server.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python3
-import argparse
 import asyncio
 import io
 import logging
@@ -7,6 +5,7 @@ import os
 import re
 import struct
 import urllib.parse
+import traceback
 from typing import Dict, Optional
 
 from aioquic.asyncio import QuicConnectionProtocol, serve
@@ -16,8 +15,9 @@ from aioquic.quic.events import StreamDataReceived, QuicEvent
 from aioquic.tls import SessionTicket
 
 SERVER_NAME = 'aioquic-transport'
+logger = logging.getLogger(__name__)
 
-handlers_path = None
+handlers_path = ''
 
 
 class EventHandler:
@@ -50,7 +50,7 @@ class QuicTransportProtocol(QuicConnectionProtocol):
 
     def quic_event_received(self, event: QuicEvent) -> None:
         prefix = '!!'
-        logging.log(logging.INFO, 'QUIC event: %s' % type(event))
+        logger.info('QUIC event: %s', type(event))
         try:
             if (not self.client_indication_finished and
                     isinstance(event, StreamDataReceived) and
@@ -75,7 +75,8 @@ class QuicTransportProtocol(QuicConnectionProtocol):
                 self.handler.handle_event(event)
         except Exception as e:
             self.handler = None
-            logging.log(logging.WARN, prefix + str(e))
+            logger.warn(prefix + str(e))
+            traceback.print_exc()
             self.close()
 
     def parse_client_indication(self, bs):
@@ -113,8 +114,7 @@ class QuicTransportProtocol(QuicConnectionProtocol):
             else:
                 # We must ignore unrecognized fields.
                 pass
-        logging.log(logging.INFO,
-                    'origin = %s, path = %s' % (origin_string, path_string))
+        logger.info('origin = %s, path = %s', origin_string, path_string)
         if origin is None:
             raise Exception('No origin is given')
         if path is None:
@@ -125,7 +125,7 @@ class QuicTransportProtocol(QuicConnectionProtocol):
             raise Exception('Invalid origin: %s' % origin_string)
 
         # To make the situation simple we accept only simple path strings.
-        m = re.compile('^/([a-zA-Z0-9\._\-]+)$').match(path.path)
+        m = re.compile(r'^/([a-zA-Z0-9\._\-]+)$').match(path.path)
         if m is None:
             raise Exception('Invalid path: %s' % path_string)
 
@@ -136,7 +136,7 @@ class QuicTransportProtocol(QuicConnectionProtocol):
         if self.is_closing_or_closed():
             return
         self.client_indication_finished = True
-        logging.log(logging.INFO, 'Client indication finished')
+        logger.info('Client indication finished')
 
     def create_event_handler(self, handler_name: str) -> None:
         global_dict = {}
@@ -167,73 +167,29 @@ class SessionTicketStore:
         return self.tickets.pop(label, None)
 
 
-if __name__ == '__main__':
-    parser = argparse.ArgumentParser(description='QUIC server')
-    parser.add_argument(
-        '-c',
-        '--certificate',
-        type=str,
-        required=True,
-        help='load the TLS certificate from the specified file',
-    )
-    parser.add_argument(
-        '--host',
-        type=str,
-        default='::',
-        help='listen on the specified address (defaults to ::)',
-    )
-    parser.add_argument(
-        '--port',
-        type=int,
-        default=4433,
-        help='listen on the specified port (defaults to 4433)',
-    )
-    parser.add_argument(
-        '-k',
-        '--private-key',
-        type=str,
-        required=True,
-        help='load the TLS private key from the specified file',
-    )
-    parser.add_argument(
-        '--handlers-path',
-        type=str,
-        required=True,
-        help='the directory path of QuicTransport event handlers',
-    )
-    parser.add_argument(
-        '-v',
-        '--verbose',
-        action='store_true',
-        help='increase logging verbosity'
-    )
-    args = parser.parse_args()
-
-    logging.basicConfig(
-        format='%(asctime)s %(levelname)s %(name)s %(message)s',
-        level=logging.DEBUG if args.verbose else logging.INFO,
-    )
-
+def start(kwargs):
     configuration = QuicConfiguration(
         alpn_protocols=['wq-vvv-01'] + ['siduck'],
         is_client=False,
         max_datagram_frame_size=65536,
     )
 
-    handlers_path = os.path.abspath(os.path.expanduser(args.handlers_path))
-    logging.log(logging.INFO, 'port = %s' % args.port)
-    logging.log(logging.INFO, 'handlers path = %s' % handlers_path)
+    global handlers_path
+    handlers_path = os.path.abspath(os.path.expanduser(
+        kwargs['handlers_path']))
+    logger.info('port = %s', kwargs['port'])
+    logger.info('handlers path = %s', handlers_path)
 
     # load SSL certificate and key
-    configuration.load_cert_chain(args.certificate, args.private_key)
+    configuration.load_cert_chain(kwargs['certificate'], kwargs['private_key'])
 
     ticket_store = SessionTicketStore()
 
     loop = asyncio.get_event_loop()
     loop.run_until_complete(
         serve(
-            args.host,
-            args.port,
+            kwargs['host'],
+            kwargs['port'],
             configuration=configuration,
             create_protocol=QuicTransportProtocol,
             session_ticket_fetcher=ticket_store.pop,
diff --git a/tests/wpt/web-platform-tests/tools/quic/serve.py b/tests/wpt/web-platform-tests/tools/quic/serve.py
index 9893f25e27b..517b4c34b93 100755
--- a/tests/wpt/web-platform-tests/tools/quic/serve.py
+++ b/tests/wpt/web-platform-tests/tools/quic/serve.py
@@ -1,25 +1,73 @@
 #!/usr/bin/env python3
 
 import argparse
+import logging
+import os
 import sys
 
+_dir = os.path.dirname(__file__)
+
 
 def get_parser():
-    parser = argparse.ArgumentParser()
-    parser.add_argument("--verbose", action="store_true", default=False,
-                        help="turn on verbose logging")
+    parser = argparse.ArgumentParser(description='QUIC server')
+    parser.add_argument(
+        '-c',
+        '--certificate',
+        type=str,
+        default=os.path.join(_dir, 'certs', 'cert.pem'),
+        help='load the TLS certificate from the specified file',
+    )
+    parser.add_argument(
+        '--host',
+        type=str,
+        default='::',
+        help='listen on the specified address (defaults to ::)',
+    )
+    parser.add_argument(
+        '--port',
+        type=int,
+        default=4433,
+        help='listen on the specified port (defaults to 4433)',
+    )
+    parser.add_argument(
+        '-k',
+        '--private-key',
+        type=str,
+        default=os.path.join(_dir, 'certs', 'cert.key'),
+        help='load the TLS private key from the specified file',
+    )
+    parser.add_argument(
+        '--handlers-path',
+        type=str,
+        default=os.path.join(
+            _dir, '..', '..', 'webtransport', 'quic', 'handlers'),
+        help='the directory path of QuicTransport event handlers',
+    )
+    parser.add_argument(
+        '-v',
+        '--verbose',
+        action='store_true',
+        help='increase logging verbosity'
+    )
     return parser
 
 
 def run(venv, **kwargs):
-    # TODO(Hexcles): Replace this with actual implementation.
-    print(sys.version)
-    assert sys.version_info.major == 3
-    import aioquic
-    print('aioquic: ' + aioquic.__version__)
+    assert sys.version_info.major == 3, 'QUIC server only runs in Python 3'
+    logging.basicConfig(
+        format='%(asctime)s %(levelname)s %(name)s %(message)s',
+        level=logging.DEBUG if kwargs.get('verbose') else logging.INFO,
+    )
+
+    # Delay import after version check to make the error easier to understand.
+    from .quic_transport_server import start
+    start(kwargs)
 
 
 def main():
+    # This is only used when executing the script directly. Users are
+    # responsible for managing venv themselves. `wpt serve-quic-transport` does
+    # NOT use this code path.
     kwargs = vars(get_parser().parse_args())
     return run(None, **kwargs)
 
diff --git a/tests/wpt/web-platform-tests/tools/serve/serve.py b/tests/wpt/web-platform-tests/tools/serve/serve.py
index 43ff7bd0dfb..d98c81eafbb 100644
--- a/tests/wpt/web-platform-tests/tools/serve/serve.py
+++ b/tests/wpt/web-platform-tests/tools/serve/serve.py
@@ -10,6 +10,7 @@ import os
 import platform
 import signal
 import socket
+import subprocess
 import sys
 import threading
 import time
@@ -528,7 +529,8 @@ def start_servers(host, ports, paths, routes, bind_address, config, **kwargs):
                          "https": start_https_server,
                          "h2": start_http2_server,
                          "ws": start_ws_server,
-                         "wss": start_wss_server}[scheme]
+                         "wss": start_wss_server,
+                         "quic-transport": start_quic_transport_server}[scheme]
 
             server_proc = ServerProc(scheme=scheme)
             server_proc.start(init_func, host, port, paths, routes, bind_address,
@@ -702,6 +704,63 @@ def start_wss_server(host, port, paths, routes, bind_address, config, **kwargs):
         startup_failed(log=False)
 
 
+class QuicTransportDaemon(object):
+    def __init__(self, host, port, handlers_path=None, private_key=None, certificate=None, log_level=None):
+        args = ["python3", "wpt", "serve-quic-transport"]
+        if host:
+            args += ["--host", host]
+        if port:
+            args += ["--port", str(port)]
+        if private_key:
+            args += ["--private-key", private_key]
+        if certificate:
+            args += ["--certificate", certificate]
+        if handlers_path:
+            args += ["--handlers-path", handlers_path]
+        if log_level == "debug":
+            args += ["--verbose"]
+        self.command = args
+        self.proc = None
+
+    def start(self, block=False):
+        if block:
+            subprocess.call(self.command)
+        else:
+            def handle_signal(*_):
+                if self.proc:
+                    try:
+                        self.proc.terminate()
+                    except OSError:
+                        # It's fine if the child already exits.
+                        pass
+                    self.proc.wait()
+                sys.exit(0)
+
+            signal.signal(signal.SIGTERM, handle_signal)
+            signal.signal(signal.SIGINT, handle_signal)
+
+            self.proc = subprocess.Popen(self.command)
+            # Give the server a second to start and then check.
+            time.sleep(1)
+            if self.proc.poll():
+                sys.exit(1)
+
+
+def start_quic_transport_server(host, port, paths, routes, bind_address, config, **kwargs):
+    # Ensure that when we start this in a new process we have the global lock
+    # in the logging module unlocked
+    reload_module(logging)
+    release_mozlog_lock()
+    try:
+        return QuicTransportDaemon(host,
+                          port,
+                          private_key=config.ssl_config["key_path"],
+                          certificate=config.ssl_config["cert_path"],
+                          log_level=config.log_level)
+    except Exception:
+        startup_failed(log=False)
+
+
 def start(config, routes, **kwargs):
     host = config["server_host"]
     ports = config.ports
@@ -729,6 +788,8 @@ def build_config(override_path=None, **kwargs):
         enable_http2 = True
     if enable_http2:
         rv._default["ports"]["h2"] = [9000]
+    if kwargs.get("quic_transport"):
+        rv._default["ports"]["quic-transport"] = [10000]
 
     if override_path and os.path.exists(override_path):
         with open(override_path) as f:
@@ -880,6 +941,7 @@ def get_parser():
                         help=argparse.SUPPRESS)
     parser.add_argument("--no-h2", action="store_false", dest="h2", default=None,
                         help="Disable the HTTP/2.0 server")
+    parser.add_argument("--quic-transport", action="store_true", help="Enable QUIC server for WebTransport")
     return parser
 
 
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/environment.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/environment.py
index f76836ea66b..1236d1f9bc2 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/environment.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/environment.py
@@ -126,7 +126,7 @@ class TestEnvironment(object):
 
         config = serve.ConfigBuilder()
 
-        config.ports = {
+        ports = {
             "http": [8000, 8001],
             "https": [8443],
             "ws": [8888],
@@ -134,7 +134,8 @@ class TestEnvironment(object):
             "h2": [9000],
         }
         if self.enable_quic:
-            config.ports["quic"] = [10000]
+            ports["quic-transport"] = [10000]
+        config.ports = ports
 
         if os.path.exists(override_path):
             with open(override_path) as f:
@@ -238,6 +239,9 @@ class TestEnvironment(object):
 
         if not failed and self.test_server_port:
             for scheme, servers in iteritems(self.servers):
+                # TODO(Hexcles): Find a way to test QUIC's UDP port.
+                if scheme == "quic-transport":
+                    continue
                 for port, server in servers:
                     s = socket.socket()
                     s.settimeout(0.1)
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/tests/test_response.py b/tests/wpt/web-platform-tests/tools/wptserve/tests/test_response.py
new file mode 100644
index 00000000000..f8048ac1ce5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/wptserve/tests/test_response.py
@@ -0,0 +1,32 @@
+import mock
+from six import BytesIO
+
+from wptserve.response import Response
+
+
+def test_response_status():
+    cases = [200, (200, b'OK'), (200, u'OK'), ('200', 'OK')]
+
+    for case in cases:
+        handler = mock.Mock()
+        handler.wfile = BytesIO()
+        request = mock.Mock()
+        request.protocol_version = 'HTTP/1.1'
+        response = Response(handler, request)
+
+        response.status = case
+        expected = case if isinstance(case, tuple) else (case, None)
+        if expected[0] == '200':
+            expected = (200, expected[1])
+        assert response.status == expected
+        response.writer.write_status(*response.status)
+        assert handler.wfile.getvalue() == b'HTTP/1.1 200 OK\r\n'
+
+
+def test_response_status_not_string():
+    # This behaviour is not documented but kept for backward compatibility.
+    handler = mock.Mock()
+    request = mock.Mock()
+    response = Response(handler, request)
+    response.status = (200, 100)
+    assert response.status == (200, '100')
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py
index b6f27447451..b24f0cdf476 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py
@@ -52,8 +52,9 @@ class Response(object):
 
     .. attribute:: status
 
-       Status tuple (code, message). Can be set to an integer, in which case the
-       message part is filled in automatically, or a tuple.
+       Status tuple (code, message). Can be set to an integer in which case the
+       message part is filled in automatically, or a tuple (code, message) in
+       which case code is an int and message is a text or binary string.
 
     .. attribute:: headers
 
@@ -92,7 +93,13 @@ class Response(object):
             if len(value) != 2:
                 raise ValueError
             else:
-                self._status = (int(value[0]), str(value[1]))
+                code = int(value[0])
+                message = value[1]
+                # Only call str() if message is not a string type, so that we
+                # don't get `str(b"foo") == "b'foo'"` in Python 3.
+                if not isinstance(message, (binary_type, text_type)):
+                    message = str(message)
+                self._status = (code, message)
         else:
             self._status = (int(value), None)
 
@@ -673,8 +680,8 @@ class ResponseWriter(object):
                 message = response_codes[code][0]
             else:
                 message = ''
-        self.write("%s %d %s\r\n" %
-                   (self._response.request.protocol_version, code, message))
+        self.write(b"%s %d %s\r\n" %
+                   (isomorphic_encode(self._response.request.protocol_version), code, isomorphic_encode(message)))
         self._status_written = True
 
     def write_header(self, name, value):
diff --git a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
index e48d133f464..5b0d59153dc 100644
--- a/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
@@ -212,8 +212,9 @@ promise_test(async t => {
   const pc2 = new RTCPeerConnection();
   t.add_cleanup(() => pc2.close());
 
-  pc1.createDataChannel("dummy", {negotiated: true, id: 0});
-  pc2.createDataChannel("dummy", {negotiated: true, id: 0});
+  const dc1 = pc1.createDataChannel("dummy", {negotiated: true, id: 0});
+  const dc2 = pc2.createDataChannel("dummy", {negotiated: true, id: 0});
+
   const stream = await getNoiseStream({video: true, audio:true});
   for (const track of stream.getTracks()) {
     pc1.addTrack(track, stream);
diff --git a/tests/wpt/web-platform-tests/webtransport/quic/client-indication.any.js b/tests/wpt/web-platform-tests/webtransport/quic/client-indication.sub.any.js
similarity index 95%
rename from tests/wpt/web-platform-tests/webtransport/quic/client-indication.any.js
rename to tests/wpt/web-platform-tests/webtransport/quic/client-indication.sub.any.js
index 15baa5f8542..62f2f3fe4d2 100644
--- a/tests/wpt/web-platform-tests/webtransport/quic/client-indication.any.js
+++ b/tests/wpt/web-platform-tests/webtransport/quic/client-indication.sub.any.js
@@ -1,7 +1,7 @@
 // META: quic=true
 // META: script=/common/get-host-info.sub.js
 
-const PORT = 8983;
+const PORT = '{{ports[quic-transport][0]}}';
 const {ORIGINAL_HOST: HOST, ORIGIN} = get_host_info();
 const BASE = `quic-transport://${HOST}:${PORT}`;
 
diff --git a/tests/wpt/web-platform-tests/webxr/anchors/ar_anchor_states.https.html b/tests/wpt/web-platform-tests/webxr/anchors/ar_anchor_states.https.html
new file mode 100644
index 00000000000..907da06880e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webxr/anchors/ar_anchor_states.https.html
@@ -0,0 +1,115 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../resources/webxr_util.js"></script>
+<script src="../resources/webxr_test_asserts.js"></script>
+<script src="../resources/webxr_test_constants.js"></script>
+<script src="../resources/webxr_test_constants_fake_world.js"></script>
+<canvas />
+
+<script>
+
+// 1m above world origin.
+const VIEWER_ORIGIN_TRANSFORM = {
+  position: [0, 1, 0],
+  orientation: [0, 0, 0, 1],
+};
+
+const fakeDeviceInitParams = {
+  supportedModes: ["immersive-ar"],
+  views: VALID_VIEWS,
+  supportedFeatures: ALL_FEATURES,
+  viewerOrigin: VIEWER_ORIGIN_TRANSFORM,
+};
+
+// Creates a test method that leverages anchors API.
+// |expectSucceeded| - true if the anchors creation request is expected to succeed, false otherwise
+// |endSession| - true if the test case should call session.end() prior to creating an anchor
+// |expectedError| - expected error name that should be returned in case expectSucceeded is false
+const testFunctionGenerator = function(expectSucceeded, endSession, expectedError) {
+
+  const testFunction = function(session, fakeDeviceController, t) {
+
+    let debug = xr_debug.bind(this, 'testAnchorStates');
+
+    fakeDeviceController.addEventListener("anchorcreate", (anchorCreateEvent) => {
+      // All anchor creation requests that reach this stage should be marked as successful.
+      // If this test is expected to fail, the failure will happen earlier in the anchor
+      // creation process.
+      anchorCreateEvent.success = true;
+    });
+
+    let watcherDone = new Event("watcherdone");
+    let eventWatcher = new EventWatcher(t, session, ["watcherdone"]);
+    let eventPromise = eventWatcher.wait_for(["watcherdone"]);
+
+    session.requestReferenceSpace('local').then((localRefSpace) => {
+
+      const onFrame = function(time, frame) {
+        debug("rAF 1");
+
+        let setUpPromise = Promise.resolve();
+        if(endSession) {
+          debug("ending session");
+          setUpPromise = session.end();
+        }
+
+        setUpPromise.then(() => {
+          debug("creating anchor");
+          frame.createAnchor(new XRRigidTransform(), localRefSpace)
+            .then((anchor) => {
+              debug("anchor created");
+
+              t.step(() => {
+                assert_true(expectSucceeded,
+                  "`createAnchor` succeeded when it was expected to fail");
+              });
+
+              session.dispatchEvent(watcherDone);
+            }).catch((error) => {
+              debug("anchor creation failed");
+
+              t.step(() =>  {
+                assert_false(expectSucceeded,
+                  "`createAnchor` failed when it was expected to succeed, error: " + error);
+                assert_equals(error.name, expectedError,
+                  "`createAnchor` failed with unexpected error name");
+              });
+
+              session.dispatchEvent(watcherDone);
+            });
+
+          // Anchor result will only take effect with frame data - schedule
+          // a frame after we requested anchor creation, otherwise the test will time out.
+          session.requestAnimationFrame(() => {
+            debug("rAF 2");
+          });
+        }); // setUpPromise.then(() => { ... })
+      }; // onFrame() { ... }
+
+      debug("requesting animation frame");
+      session.requestAnimationFrame(onFrame);
+    }); // session.requestReferenceSpace(...)
+
+    return eventPromise;
+  };  // testFunction
+
+  return testFunction;
+};
+
+xr_session_promise_test("Anchor creation succeeds if the feature was requested",
+  testFunctionGenerator(/*expectSucceeded=*/true, /*endSession=*/false),
+  fakeDeviceInitParams,
+  'immersive-ar', { 'requiredFeatures': ['anchors'] });
+
+xr_session_promise_test("Anchor creation fails if the feature was not requested",
+  testFunctionGenerator(/*expectSucceeded=*/false, /*endSession=*/false, "NotSupportedError"),
+  fakeDeviceInitParams,
+  'immersive-ar', {});
+
+xr_session_promise_test("Anchor creation fails if the feature was requested but the session already ended",
+  testFunctionGenerator(/*expectSucceeded=*/false, /*endSession=*/true, "InvalidStateError"),
+  fakeDeviceInitParams,
+  'immersive-ar', { 'requiredFeatures': ['anchors'] });
+
+</script>
diff --git a/tests/wpt/web-platform-tests/webxr/resources/webxr_test_constants.js b/tests/wpt/web-platform-tests/webxr/resources/webxr_test_constants.js
index 3ae294c015a..139ab775684 100644
--- a/tests/wpt/web-platform-tests/webxr/resources/webxr_test_constants.js
+++ b/tests/wpt/web-platform-tests/webxr/resources/webxr_test_constants.js
@@ -124,6 +124,7 @@ const ALL_FEATURES = [
   'hit-test',
   'dom-overlay',
   'light-estimation',
+  'anchors',
 ];
 
 const TRACKED_IMMERSIVE_DEVICE = {