diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
new file mode 100644
index 00000000000..f29da48a2a0
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-003.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
index cb2edcb5dcd..6425f4beda1 100644
--- a/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -5,6 +5,9 @@
   [[data-expected-height\] 7]
     expected: FAIL
 
-  [[data-expected-height\] 4]
+  [[data-expected-height\] 1]
+    expected: FAIL
+
+  [[data-expected-height\] 2]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/css/css-ui/appearance-button-002.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-ui/appearance-button-002.tentative.html.ini
new file mode 100644
index 00000000000..c166ea99deb
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-ui/appearance-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[appearance-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-ui/appearance-menulist-button-002.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-ui/appearance-menulist-button-002.tentative.html.ini
new file mode 100644
index 00000000000..21178f6a0a9
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-ui/appearance-menulist-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[appearance-menulist-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-button-002.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-button-002.tentative.html.ini
new file mode 100644
index 00000000000..f76be95ab6e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[webkit-appearance-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini
new file mode 100644
index 00000000000..d482c8119d6
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[webkit-appearance-menulist-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
deleted file mode 100644
index 4c79907309b..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[CaretPosition-001.html]
-  [Element at (400, 100)]
-    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-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/scrollingElement.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/scrollingElement.html.ini
index 59a11df4bc7..2feec30bf75 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/scrollingElement.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/scrollingElement.html.ini
@@ -5,3 +5,24 @@
   [scrollingElement in no-quirks mode]
     expected: FAIL
 
+  [scrollingElement in quirks mode (body table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode ]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (root table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (body table)]
+    expected: FAIL
+
+  [scrollingElement in quirks mode (root table, body table)]
+    expected: FAIL
+
+  [scrollingElement in quirks mode (root table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (root table, body table)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom/CSS-namespace-object-class-string.html.ini b/tests/wpt/metadata-layout-2020/css/cssom/CSS-namespace-object-class-string.html.ini
new file mode 100644
index 00000000000..bb7130b6553
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom/CSS-namespace-object-class-string.html.ini
@@ -0,0 +1,13 @@
+[CSS-namespace-object-class-string.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
+  [Object.prototype.toString applied to the namespace object]
+    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 eb1eba631ec..a7ddeaab5a4 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
@@ -312,9 +312,6 @@
   [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 */*]
     expected: FAIL
 
@@ -330,3 +327,15 @@
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    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 b2ffc8abf78..d2df9b78483 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
@@ -56,6 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript error]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/gamepad/idlharness-extensions.window.js.ini b/tests/wpt/metadata-layout-2020/gamepad/idlharness-extensions.window.js.ini
new file mode 100644
index 00000000000..e7297d19793
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/gamepad/idlharness-extensions.window.js.ini
@@ -0,0 +1,28 @@
+[idlharness-extensions.window.html]
+  [GamepadHapticActuator interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface object]
+    expected: FAIL
+
+  [GamepadHapticActuator interface object name]
+    expected: FAIL
+
+  [GamepadHapticActuator interface object length]
+    expected: FAIL
+
+  [Gamepad interface: attribute hapticActuators]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: attribute type]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: operation pulse(double, double)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
deleted file mode 100644
index 75d75b4cda2..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[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_2.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
rename to tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
index 75d75b4cda2..385376c7321 100644
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_2.html]
+[traverse_the_history_4.html]
   [Multiple history traversals, last would be aborted]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
deleted file mode 100644
index dc2e45516de..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_5.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
new file mode 100644
index 00000000000..735a9a75a2a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/origin/cross-origin-objects/cross-origin-objects-on-new-window.html.ini
@@ -0,0 +1,2 @@
+[cross-origin-objects-on-new-window.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/html/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 d913fcbb129..3080be9afc0 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-1.html]
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index c792a071c3b..0407f0cc2b7 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index 7a36937927c..7d2b5231af2 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
new file mode 100644
index 00000000000..fca4d908c89
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
@@ -0,0 +1,4 @@
+[module-static-import-delayed.html]
+  [document.write in an imported module]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
index 57744023f73..58c9d7f8c0c 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
@@ -1,5 +1,5 @@
 [ignore-opens-during-unload.window.html]
-  expected: CRASH
+  expected: TIMEOUT
   [document.open should bail out when ignore-opens-during-unload is greater than 0 during visibilitychange event (open(parent) while unloading parent and child)]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index a1effd5f801..5ddb9bfeff6 100644
--- a/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,9 +1,10 @@
 [promise-job-entry.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/resource-timing/resource_initiator_types.html.ini b/tests/wpt/metadata-layout-2020/resource-timing/resource_initiator_types.html.ini
new file mode 100644
index 00000000000..c5a1226c943
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/resource-timing/resource_initiator_types.html.ini
@@ -0,0 +1,2 @@
+[resource_initiator_types.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/namespace-object-class-string.any.js.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/namespace-object-class-string.any.js.ini
new file mode 100644
index 00000000000..8126018bc63
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/namespace-object-class-string.any.js.ini
@@ -0,0 +1,21 @@
+[namespace-object-class-string.any.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
+
+[namespace-object-class-string.any.worker.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata-layout-2020/webmessaging/with-ports/018.html.ini
rename to tests/wpt/metadata-layout-2020/webmessaging/without-ports/018.html.ini
diff --git a/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8..00000000000
--- a/tests/wpt/metadata-layout-2020/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index d3ed19db694..cdcabef6de5 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -162075,6 +162075,32 @@
      ]
     },
     "css-pseudo": {
+     "active-selection-021.html": [
+      "2061385d6c564c32ff2e36fc096df5b633d7ec2a",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/reference/active-selection-021-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "active-selection-024.html": [
+      "5668df550bb0183569d4ed913c6292ea476f77ef",
+      [
+       null,
+       [
+        [
+         "/css/css-pseudo/reference/active-selection-024-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "active-selection-051.html": [
       "caab01e392428560331729292f99b91bd20ac20e",
       [
@@ -168383,7 +168409,7 @@
       ]
      ],
      "range-percent-intrinsic-size-2.html": [
-      "e11e2955891f251409e8519abd48f10fb2dd89e9",
+      "77d02dde130e3e4ce3f0eaf8fa8f1f1d6ac97252",
       [
        null,
        [
@@ -168396,7 +168422,7 @@
       ]
      ],
      "range-percent-intrinsic-size-2a.html": [
-      "f2c2431978b1596078f48727da0953f23e1f0d3e",
+      "73a9ca49c70d99fe2b45d15645b151104f7cc16a",
       [
        null,
        [
@@ -193801,6 +193827,45 @@
        {}
       ]
      ],
+     "appearance-auto-input-non-widget-001.html": [
+      "9e717ab8725d8667d50545f1bad8fe6ea680b9d8",
+      [
+       null,
+       [
+        [
+         "/css/css-ui/appearance-auto-input-non-widget-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "appearance-button-001.html": [
+      "33fccb5806541d12c9b570489a67d6cd9f3169c9",
+      [
+       null,
+       [
+        [
+         "/css/css-ui/appearance-button-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "appearance-button-002.tentative.html": [
+      "5c9e9a280acaf0d8c871ddc75f57963da233ee76",
+      [
+       null,
+       [
+        [
+         "/css/css-ui/appearance-button-002.tentative-ref.html",
+         "!="
+        ]
+       ],
+       {}
+      ]
+     ],
      "appearance-checkbox-001.html": [
       "54ebef94f24cd207f1e7a3f40f45cc825698df1c",
       [
@@ -193853,8 +193918,8 @@
        {}
       ]
      ],
-     "appearance-menulist-button-002.html": [
-      "60a4312b16cdc02f79a9592d446177954ac0d5b2",
+     "appearance-menulist-button-002.tentative.html": [
+      "257945062356f62f78aa400d61a76ca51d28e223",
       [
        null,
        [
@@ -193893,7 +193958,7 @@
       ]
      ],
      "appearance-progress-bar-002.html": [
-      "719b2dc220d253faa756e615d58ca947e73479f1",
+      "b04af84ba1384beabfa6034b94c207aaf9d60974",
       [
        null,
        [
@@ -195192,6 +195257,32 @@
        {}
       ]
      ],
+     "webkit-appearance-button-001.html": [
+      "c71a914723b36819e6918ca9f0358aaf98e85772",
+      [
+       null,
+       [
+        [
+         "/css/css-ui/appearance-button-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "webkit-appearance-button-002.tentative.html": [
+      "4c322fa20e4af9f3f06fcf2b9a3782add378ec38",
+      [
+       null,
+       [
+        [
+         "/css/css-ui/appearance-button-002.tentative-ref.html",
+         "!="
+        ]
+       ],
+       {}
+      ]
+     ],
      "webkit-appearance-checkbox-001.html": [
       "09dd3d76cd66d59522b02d1b6a0c0126bb5eda2a",
       [
@@ -195244,8 +195335,8 @@
        {}
       ]
      ],
-     "webkit-appearance-menulist-button-002.html": [
-      "078d568faa1795e3b86b7e623c2abc1d667b1c66",
+     "webkit-appearance-menulist-button-002.tentative.html": [
+      "9fccd82713c5f9187f77cc46940d73e10c79d765",
       [
        null,
        [
@@ -305870,6 +305961,16 @@
       "92ae71d83fcbea52e4120ed28af5438dd54d4509",
       []
      ],
+     "reference": {
+      "active-selection-021-ref.html": [
+       "7790a3fad8a36f1709fea6a4155ed5af0f3c49d7",
+       []
+      ],
+      "active-selection-024-ref.html": [
+       "e6dda1c1371b53e12f9a6601eea67ac4f5604a3b",
+       []
+      ]
+     },
      "selection-text-shadow-016-ref.html": [
       "5e3eabc976e2bc75b6a290f2b740b54d8cdbf99a",
       []
@@ -306891,11 +306992,11 @@
       []
      ],
      "range-percent-intrinsic-size-2-ref.html": [
-      "207b60d8f27ad3b1bb2b24a866d5de38807256e6",
+      "9a6e9287d96089912d00684166494e5dcb902b40",
       []
      ],
      "range-percent-intrinsic-size-2a-ref.html": [
-      "861d34c6a08d21fd9145a9697660646f31eda02d",
+      "9aab2aede09aaaea2acb3fd5e3e98a6e70286fb3",
       []
      ],
      "slice-intrinsic-size-ref.html": [
@@ -312082,12 +312183,24 @@
       "7ce4b54a22c78576dc2318ebd651dfd1cce374ad",
       []
      ],
+     "appearance-auto-input-non-widget-001-ref.html": [
+      "ffbf612615516e72befbd5b84b848e1e93de46aa",
+      []
+     ],
      "appearance-auto-ref.html": [
       "5c5cdb42e7078b18ed1e4f58f34747ce76d50c02",
       []
      ],
+     "appearance-button-001-ref.html": [
+      "3e4da522e54314d0861f35c7b38fcfd39f58ea60",
+      []
+     ],
+     "appearance-button-002.tentative-ref.html": [
+      "c8c10ea511f51f31201c1dfb49df5d97ed021af1",
+      []
+     ],
      "appearance-progress-bar-002-ref.html": [
-      "cc081a4559c57d2610710cd03c0c562309803516",
+      "d243f0c75c75f57e6fd1ca629ccf0d3d924a0c13",
       []
      ],
      "appearance-revert-ref.html": [
@@ -339301,6 +339414,10 @@
      "677b2e116f6dcf6ff8340761d473e3dcf0f83af5",
      []
     ],
+    "gamepad-extensions.idl": [
+     "f2a2811b4b45d6175c6502deabf4411817484412",
+     []
+    ],
     "gamepad.idl": [
      "27541bf2553520dcf7f2ce52386014c9a4363377",
      []
@@ -356351,7 +356468,7 @@
       []
      ],
      "requirements_firefox.txt": [
-      "21906c57fd263500fcf7bf377219ed7506b71d9a",
+      "a053971000bb0ef8d4b57631f1127e2240740729",
       []
      ],
      "requirements_ie.txt": [
@@ -382044,6 +382161,17 @@
       {}
      ]
     ],
+    "console-namespace-object-class-string.any.js": [
+     "7b27e72d819251987f1bc53cb66e65f931d443d9",
+     [
+      "console/console-namespace-object-class-string.any.html",
+      {}
+     ],
+     [
+      "console/console-namespace-object-class-string.any.worker.html",
+      {}
+     ]
+    ],
     "console-tests-historical.any.js": [
      "4c4d4c276d0cd4de4b7b2dc5ab71de6647cffaad",
      [
@@ -410346,6 +410474,13 @@
      ]
     },
     "cssom": {
+     "CSS-namespace-object-class-string.html": [
+      "96c427f6cf2dfcc75c3fdf9fb3760a72d8ba8f7f",
+      [
+       null,
+       {}
+      ]
+     ],
      "CSS.html": [
       "ba048c58acaac5cd2550fb21cb9b6e9ee8fb0bb1",
       [
@@ -412011,7 +412146,7 @@
       ]
      ],
      "scrollingElement.html": [
-      "a438541120df4a3a4e3419aaddfca9d88bd080a5",
+      "84d313741ce88f5e3ae77e5c85f79a88348caddc",
       [
        null,
        {}
@@ -435949,6 +436084,29 @@
     }
    },
    "gamepad": {
+    "idlharness-extensions.window.js": [
+     "dcf76878fc9257d4b7f2cbb6d603d9848c55f083",
+     [
+      "gamepad/idlharness-extensions.window.html",
+      {
+       "script_metadata": [
+        [
+         "script",
+         "/resources/WebIDLParser.js"
+        ],
+        [
+         "script",
+         "/resources/idlharness.js"
+        ],
+        [
+         "timeout",
+         "long"
+        ]
+       ],
+       "timeout": "long"
+      }
+     ]
+    ],
     "idlharness.window.js": [
      "0bbb0b3c701515743c24ca8ca67a96b5c61fa3cc",
      [
@@ -461414,6 +461572,13 @@
           {}
          ]
         ],
+        "resource-selection-resumes-onload.html": [
+         "b166763d14f560013fdfd4bf0be25b5e725da2db",
+         [
+          null,
+          {}
+         ]
+        ],
         "resource-selection-source-media.html": [
          "6332f0890dba075f7c8d465633d4a6f04b28fc3c",
          [
@@ -517273,6 +517438,17 @@
        ]
       ]
      },
+     "namespace-object-class-string.any.js": [
+      "2f63aca2c55e5b404b72474a43a9631dd3ae57be",
+      [
+       "wasm/jsapi/namespace-object-class-string.any.html",
+       {}
+      ],
+      [
+       "wasm/jsapi/namespace-object-class-string.any.worker.html",
+       {}
+      ]
+     ],
      "proto-from-ctor-realm.html": [
       "72931cca77cf2af6e06616af32b4608fb02d38c0",
       [
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
new file mode 100644
index 00000000000..f29da48a2a0
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-003.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-003.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
index 94a3570d26b..076c791cd3d 100644
--- a/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -8,6 +8,9 @@
   [[data-expected-height\] 3]
     expected: FAIL
 
-  [[data-expected-height\] 4]
+  [[data-expected-height\] 1]
+    expected: FAIL
+
+  [[data-expected-height\] 2]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/css-ui/appearance-button-002.tentative.html.ini b/tests/wpt/metadata/css/css-ui/appearance-button-002.tentative.html.ini
new file mode 100644
index 00000000000..c166ea99deb
--- /dev/null
+++ b/tests/wpt/metadata/css/css-ui/appearance-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[appearance-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.html.ini b/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.html.ini
deleted file mode 100644
index d203ff3bb8c..00000000000
--- a/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[appearance-menulist-button-002.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.tentative.html.ini b/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.tentative.html.ini
new file mode 100644
index 00000000000..21178f6a0a9
--- /dev/null
+++ b/tests/wpt/metadata/css/css-ui/appearance-menulist-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[appearance-menulist-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-ui/webkit-appearance-button-002.tentative.html.ini b/tests/wpt/metadata/css/css-ui/webkit-appearance-button-002.tentative.html.ini
new file mode 100644
index 00000000000..f76be95ab6e
--- /dev/null
+++ b/tests/wpt/metadata/css/css-ui/webkit-appearance-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[webkit-appearance-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.html.ini b/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.html.ini
deleted file mode 100644
index 2bbdeb8a116..00000000000
--- a/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[webkit-appearance-menulist-button-002.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini b/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini
new file mode 100644
index 00000000000..d482c8119d6
--- /dev/null
+++ b/tests/wpt/metadata/css/css-ui/webkit-appearance-menulist-button-002.tentative.html.ini
@@ -0,0 +1,2 @@
+[webkit-appearance-menulist-button-002.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
deleted file mode 100644
index 4c79907309b..00000000000
--- a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[CaretPosition-001.html]
-  [Element at (400, 100)]
-    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-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/scrollingElement.html.ini b/tests/wpt/metadata/css/cssom-view/scrollingElement.html.ini
index 59a11df4bc7..2feec30bf75 100644
--- a/tests/wpt/metadata/css/cssom-view/scrollingElement.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/scrollingElement.html.ini
@@ -5,3 +5,24 @@
   [scrollingElement in no-quirks mode]
     expected: FAIL
 
+  [scrollingElement in quirks mode (body table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode ]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (root table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (body table)]
+    expected: FAIL
+
+  [scrollingElement in quirks mode (root table, body table)]
+    expected: FAIL
+
+  [scrollingElement in quirks mode (root table)]
+    expected: FAIL
+
+  [scrollingElement in no-quirks mode  (root table, body table)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom/CSS-namespace-object-class-string.html.ini b/tests/wpt/metadata/css/cssom/CSS-namespace-object-class-string.html.ini
new file mode 100644
index 00000000000..bb7130b6553
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom/CSS-namespace-object-class-string.html.ini
@@ -0,0 +1,13 @@
+[CSS-namespace-object-class-string.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
+  [Object.prototype.toString applied to the namespace object]
+    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 c14966f60f8..752f9e8a824 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,9 +312,6 @@
   [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 */*]
     expected: FAIL
 
@@ -330,3 +327,15 @@
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: combined response Content-Type: */* text/html]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    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 b2ffc8abf78..d2df9b78483 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,6 +56,3 @@
   [separate text/javascript x/x]
     expected: FAIL
 
-  [separate text/javascript error]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/gamepad/idlharness-extensions.window.js.ini b/tests/wpt/metadata/gamepad/idlharness-extensions.window.js.ini
new file mode 100644
index 00000000000..e7297d19793
--- /dev/null
+++ b/tests/wpt/metadata/gamepad/idlharness-extensions.window.js.ini
@@ -0,0 +1,28 @@
+[idlharness-extensions.window.html]
+  [GamepadHapticActuator interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface object]
+    expected: FAIL
+
+  [GamepadHapticActuator interface object name]
+    expected: FAIL
+
+  [GamepadHapticActuator interface object length]
+    expected: FAIL
+
+  [Gamepad interface: attribute hapticActuators]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: attribute type]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [GamepadHapticActuator interface: operation pulse(double, double)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
similarity index 71%
rename from tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
rename to tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
index dc2e45516de..385376c7321 100644
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -1,4 +1,4 @@
-[traverse_the_history_5.html]
+[traverse_the_history_4.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/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 9df1ac56f2a..963d4cd20ef 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: TIMEOUT
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 06bbed1fcac..d43f38b40cd 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index dc856a3d5a3..2568040e6e5 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,5 +1,6 @@
 [iframe_sandbox_popups_nonescaping-3.html]
   type: testharness
+  expected: CRASH
   [Check that popups from a sandboxed iframe do not escape the sandbox]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
new file mode 100644
index 00000000000..fca4d908c89
--- /dev/null
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
@@ -0,0 +1,4 @@
+[module-static-import-delayed.html]
+  [document.write in an imported module]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
index 910c88d3e81..69bd952d756 100644
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js.ini
@@ -1,5 +1,5 @@
 [ignore-opens-during-unload.window.html]
-  expected: CRASH
+  expected: TIMEOUT
   [ignore-opens-during-unload]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index a1effd5f801..5ddb9bfeff6 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -1,9 +1,10 @@
 [promise-job-entry.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
     expected: FAIL
@@ -15,5 +16,5 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/resource-timing/resource_initiator_types.html.ini b/tests/wpt/metadata/resource-timing/resource_initiator_types.html.ini
index 7429e30d764..85888a24ecc 100644
--- a/tests/wpt/metadata/resource-timing/resource_initiator_types.html.ini
+++ b/tests/wpt/metadata/resource-timing/resource_initiator_types.html.ini
@@ -1,4 +1,5 @@
 [resource_initiator_types.html]
+  expected: TIMEOUT
   [http://web-platform.test:8000/resource-timing/resources/all_resource_types.htm is not expected to be in the Resource Timing buffer]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/wasm/jsapi/namespace-object-class-string.any.js.ini b/tests/wpt/metadata/wasm/jsapi/namespace-object-class-string.any.js.ini
new file mode 100644
index 00000000000..8126018bc63
--- /dev/null
+++ b/tests/wpt/metadata/wasm/jsapi/namespace-object-class-string.any.js.ini
@@ -0,0 +1,21 @@
+[namespace-object-class-string.any.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
+
+[namespace-object-class-string.any.worker.html]
+  [Object.prototype.toString applied after deleting @@toStringTag]
+    expected: FAIL
+
+  [@@toStringTag exists on the namespace object with the appropriate descriptor]
+    expected: FAIL
+
+  [Object.prototype.toString applied after modifying the namespace object's @@toStringTag]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/with-ports/018.html.ini b/tests/wpt/metadata/webmessaging/without-ports/018.html.ini
similarity index 100%
rename from tests/wpt/metadata/webmessaging/with-ports/018.html.ini
rename to tests/wpt/metadata/webmessaging/without-ports/018.html.ini
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8..00000000000
--- a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/web-platform-tests/console/console-namespace-object-class-string.any.js b/tests/wpt/web-platform-tests/console/console-namespace-object-class-string.any.js
new file mode 100644
index 00000000000..7b27e72d819
--- /dev/null
+++ b/tests/wpt/web-platform-tests/console/console-namespace-object-class-string.any.js
@@ -0,0 +1,40 @@
+"use strict";
+// https://heycam.github.io/webidl/#es-namespaces
+// https://console.spec.whatwg.org/#console-namespace
+
+test(() => {
+  assert_own_property(console, Symbol.toStringTag);
+
+  const propDesc = Object.getOwnPropertyDescriptor(console, Symbol.toStringTag);
+  assert_equals(propDesc.value, "console", "value");
+  assert_equals(propDesc.writable, false, "writable");
+  assert_equals(propDesc.enumerable, false, "enumerable");
+  assert_equals(propDesc.configurable, true, "configurable");
+}, "@@toStringTag exists on the namespace object with the appropriate descriptor");
+
+test(() => {
+  assert_equals(console.toString(), "[object console]");
+  assert_equals(Object.prototype.toString.call(console), "[object console]");
+}, "Object.prototype.toString applied to the namespace object");
+
+test(t => {
+  assert_own_property(console, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(console, Symbol.toStringTag, { value: "console" });
+  });
+
+  Object.defineProperty(console, Symbol.toStringTag, { value: "Test" });
+  assert_equals(console.toString(), "[object Test]");
+  assert_equals(Object.prototype.toString.call(console), "[object Test]");
+}, "Object.prototype.toString applied after modifying the namespace object's @@toStringTag");
+
+test(t => {
+  assert_own_property(console, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(console, Symbol.toStringTag, { value: "console" });
+  });
+
+  assert_true(delete console[Symbol.toStringTag]);
+  assert_equals(console.toString(), "[object Object]");
+  assert_equals(Object.prototype.toString.call(console), "[object Object]");
+}, "Object.prototype.toString applied after deleting @@toStringTag");
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-021.html b/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-021.html
new file mode 100644
index 00000000000..2061385d6c5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-021.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Pseudo-Elements Test: active selection, color and 'text-decoration: underline overline line-through'</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#highlight-styling">
+  <link rel="match" href="reference/active-selection-021-ref.html">
+
+  <meta content="" name="flags">
+
+  <style>
+  div
+    {
+      color: red;
+      font-size: 300%;
+      text-decoration: underline overline line-through;
+    }
+
+  div::selection
+    {
+      color: green;
+    }
+  </style>
+
+  <!--
+  "
+  The element's own text decorations (both line decorations
+  and emphasis marks) are thus drawn in the pseudo-element's
+  own color when that is not currentColor, regardless of
+  their original color or fill specifications.
+  "
+  coming from
+  https://www.w3.org/TR/css-pseudo-4/#highlight-painting
+  -->
+
+  <script>
+  function startTest()
+  {
+  var targetRange = document.createRange();
+  /* We first create an empty range */
+  targetRange.selectNodeContents(document.getElementById("test"));
+  /* Then we set the range boundaries to the children of div#test */
+  window.getSelection().addRange(targetRange);
+  /* Finally, we now select such range of content */
+  }
+  </script>
+
+  <body onload="startTest();">
+
+  <p>Test passes if each glyph of "Selected Text" is green and <strong>not red</strong> and if the underline, the overline and the line-through are also green and not red.
+
+  <div id="test">Selected Text</div>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-024.html b/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-024.html
new file mode 100644
index 00000000000..5668df550bb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/active-selection-024.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Pseudo-Elements Test: active selection and first-letter pseudo-element</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+  <link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#highlight-selectors">
+  <link rel="match" href="reference/active-selection-024-ref.html">
+
+  <meta content="" name="flags">
+  <meta name="assert" content="In this test, the ::selection pseudo-element must paint over the ::first-letter pseudo-element since the first letter is being selected.">
+
+  <style>
+  div
+    {
+      color: black;
+      font-size: 300%;
+    }
+
+  div::first-letter
+    {
+      color: red;
+    }
+
+  div::selection
+    {
+      background-color: yellow;
+      color: green;
+    }
+  </style>
+
+  <script>
+  function startTest()
+  {
+  var targetRange = document.createRange();
+  /* We first create an empty range */
+  targetRange.selectNodeContents(document.getElementById("test"));
+  /* Then we set the range boundaries to the children of div#test */
+  window.getSelection().addRange(targetRange);
+  /* Finally, we now select such range of content */
+  }
+  </script>
+
+  <body onload="startTest();">
+
+  <p>Test passes if background color of "Selected Text" is yellow and if each glyph of "Selected Text" is green.
+
+  <div id="test">Selected Text</div>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-021-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-021-ref.html
new file mode 100644
index 00000000000..7790a3fad8a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-021-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest Reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      color: green;
+      font-size: 300%;
+      text-decoration: underline overline line-through;
+    }
+  </style>
+
+  <p>Test passes if each glyph of "Selected Text" is green and <strong>not red</strong> and if the underline, the overline and the line-through are also green and not red.
+
+  <div>Selected Text</div>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-024-ref.html b/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-024-ref.html
new file mode 100644
index 00000000000..e6dda1c1371
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/reference/active-selection-024-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest Reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      background-color: yellow;
+      color: green;
+      display: inline;
+      font-size: 300%;
+    }
+  </style>
+
+  <p>Test passes if background color of "Selected Text" is yellow and if each glyph of "Selected Text" is green.
+
+  <div>Selected Text</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html
index 207b60d8f27..9a6e9287d96 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2-ref.html
@@ -42,6 +42,7 @@ div {
 input[orient="vertical"] {
   -webkit-appearance: slider-vertical;
   -webkit-appearance: range;
+  appearance: auto;
 }
 
 </style></head><body>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2.html b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2.html
index e11e2955891..77d02dde130 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2.html
@@ -52,6 +52,7 @@ div {
 input[orient="vertical"] {
   -webkit-appearance: slider-vertical;
   -webkit-appearance: range;
+  appearance: auto;
 }
 
 </style></head><body>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a-ref.html b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a-ref.html
index 861d34c6a08..9aab2aede09 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a-ref.html
@@ -35,10 +35,6 @@ div {
   grid: auto / min-content;
   place-items: start;
 }
-input[orient="vertical"] {
-  -webkit-appearance: slider-vertical;
-  -webkit-appearance: range;
-}
 
 </style></head><body>
 
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a.html b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a.html
index f2c2431978b..73a9ca49c70 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/range-percent-intrinsic-size-2a.html
@@ -45,10 +45,6 @@ div {
   grid: auto / min-content;
   place-items: start;
 }
-input[orient="vertical"] {
-  -webkit-appearance: slider-vertical;
-  -webkit-appearance: range;
-}
 
 </style></head><body>
 
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001-ref.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001-ref.html
new file mode 100644
index 00000000000..ffbf6126155
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001-ref.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Reference: appearance: auto on non-widget input elements</title>
+<input type="hidden" value="abc">
+<input type="image" value="def">
+<input type="file">
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001.html
new file mode 100644
index 00000000000..9e717ab8725
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-auto-input-non-widget-001.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: appearance: auto on non-widget input elements</title>
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="The default widget type for these elements is none.">
+<link rel="match" href="appearance-auto-input-non-widget-001-ref.html">
+<style>
+input { appearance: auto; }
+</style>
+<input type="hidden" value="abc">
+<input type="image" value="def">
+<input type="file">
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001-ref.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001-ref.html
new file mode 100644
index 00000000000..3e4da522e54
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Reference: appearance: button</title>
+<style>
+ #container { width: 500px; }
+ #container > :not(a) { appearance: auto; }
+</style>
+<div id="container">
+	<input type="text" value="input-text">
+	<input type="search" value="input-search">
+	<textarea>textarea</textarea>
+	<input type="button" value="input-button">
+	<input type="submit" value="input-submit">
+	<input type="reset" value="input-reset">
+	<input type="range">
+	<input type="checkbox">
+	<input type="radio">
+	<input type="color">
+	<select multiple><option>select-multiple</option></select>
+	<meter value=0.5></meter>
+	<progress value=0.5></progress>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001.html
new file mode 100644
index 00000000000..33fccb58065
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: appearance: button</title>
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="button is treated as auto on input, textarea, list box select, meter, and progress elements.">
+<link rel="match" href="appearance-button-001-ref.html">
+<style>
+ #container { width: 500px; }
+ #container > * { appearance: none; appearance: button; }
+</style>
+<div id="container">
+	<input type="text" value="input-text">
+	<input type="search" value="input-search">
+	<textarea>textarea</textarea>
+	<input type="button" value="input-button">
+	<input type="submit" value="input-submit">
+	<input type="reset" value="input-reset">
+	<input type="range">
+	<input type="checkbox">
+	<input type="radio">
+	<input type="color">
+	<select multiple><option>select-multiple</option></select>
+	<meter value=0.5></meter>
+	<progress value=0.5></progress>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative-ref.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative-ref.html
new file mode 100644
index 00000000000..c8c10ea511f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Reference: appearance: button</title>
+<select><option>select</option></select>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative.html
new file mode 100644
index 00000000000..5c9e9a280ac
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-button-002.tentative.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: appearance: button</title>
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="Drop-down select elements with appearance: button are rendered differently from appearance: auto.">
+<link rel="mismatch" href="appearance-button-002.tentative-ref.html">
+<style>
+ select { appearance: none; appearance: button; }
+</style>
+<!--
+  Test marked as tentative since although css-ui says "The element is rendered
+  with the look and feel of a push button, similar to the appearance: auto
+  rendering of the [HTML] button element.", there is no requirement that the
+  look and feel of a push button is different from that of a drop-down select.
+  -->
+<select><option>select</option></select>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.tentative.html
similarity index 66%
rename from tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.html
rename to tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.tentative.html
index 60a4312b16c..25794506235 100644
--- a/tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.html
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-menulist-button-002.tentative.html
@@ -8,6 +8,18 @@
  #container { width: 500px; }
  #container > #drop-down-select { appearance: none; appearance: menulist-button; }
 </style>
+<!--
+  Test marked as tentative since although css-ui says:
+
+    For drop-down box select elements, the element is rendered as a drop-down
+    box, including a "drop-down button", but not necessarily using a native
+    control of the host operating system. For such elements, CSS properties
+    such as color, background-color, and border (that can be disregarded for
+    auto) should not be disregarded.
+
+  there is no requirement that this rendering is any different from the
+  automatic widget appearance of a drop-down select.
+  -->
 <div id="container">
 	<a>a</a>
 	<button>button</button>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002-ref.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002-ref.html
index cc081a4559c..d243f0c75c7 100644
--- a/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002-ref.html
@@ -1,4 +1,4 @@
 <!doctype html>
 <title>CSS Test Reference</title>
-<progress style="appearance:auto">
-<progress style="appearance:none">
+<progress style="appearance:auto" value="0.5">
+<progress style="appearance:none" value="0.5">
diff --git a/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002.html b/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002.html
index 719b2dc220d..b04af84ba13 100644
--- a/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002.html
+++ b/tests/wpt/web-platform-tests/css/css-ui/appearance-progress-bar-002.html
@@ -7,8 +7,8 @@
   #progress1 { appearance: none }
   #progress2 { appearance: auto }
 </style>
-<progress id="progress1">
-<progress id="progress2">
+<progress id="progress1" value="0.5">
+<progress id="progress2" value="0.5">
 <script>
   document.body.offsetTop;
   progress1.style.appearance = "auto";
diff --git a/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-001.html b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-001.html
new file mode 100644
index 00000000000..c71a914723b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-001.html
@@ -0,0 +1,29 @@
+<!-- DO NOT EDIT THIS FILE.
+Edit the appearance-* file instead and then run:
+    ./tools/appearance-build-webkit-reftests.py
+-->
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: -webkit-appearance: button</title>
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="button is treated as auto on input, textarea, list box select, meter, and progress elements.">
+<link rel="match" href="appearance-button-001-ref.html">
+<style>
+ #container { width: 500px; }
+ #container > * { -webkit-appearance: none; -webkit-appearance: button; }
+</style>
+<div id="container">
+	<input type="text" value="input-text">
+	<input type="search" value="input-search">
+	<textarea>textarea</textarea>
+	<input type="button" value="input-button">
+	<input type="submit" value="input-submit">
+	<input type="reset" value="input-reset">
+	<input type="range">
+	<input type="checkbox">
+	<input type="radio">
+	<input type="color">
+	<select multiple><option>select-multiple</option></select>
+	<meter value=0.5></meter>
+	<progress value=0.5></progress>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-002.tentative.html b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-002.tentative.html
new file mode 100644
index 00000000000..4c322fa20e4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-button-002.tentative.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: -webkit-appearance: button</title>
+<link rel="help" href="https://drafts.csswg.org/css-ui-4/#appearance-switching">
+<meta name="assert" content="Drop-down select elements with appearance: button are rendered differently from appearance: auto.">
+<link rel="mismatch" href="appearance-button-002.tentative-ref.html">
+<style>
+ select { -webkit-appearance: none; -webkit-appearance: button; }
+</style>
+<!--
+  Test marked as tentative since although css-ui says "The element is rendered
+  with the look and feel of a push button, similar to the appearance: auto
+  rendering of the [HTML] button element.", there is no requirement that the
+  look and feel of a push button is different from that of a drop-down select.
+  -->
+<select><option>select</option></select>
diff --git a/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.html b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.tentative.html
similarity index 69%
rename from tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.html
rename to tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.tentative.html
index 078d568faa1..9fccd82713c 100644
--- a/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.html
+++ b/tests/wpt/web-platform-tests/css/css-ui/webkit-appearance-menulist-button-002.tentative.html
@@ -12,6 +12,18 @@ Edit the appearance-* file instead and then run:
  #container { width: 500px; }
  #container > #drop-down-select { -webkit-appearance: none; -webkit-appearance: menulist-button; }
 </style>
+<!--
+  Test marked as tentative since although css-ui says:
+
+    For drop-down box select elements, the element is rendered as a drop-down
+    box, including a "drop-down button", but not necessarily using a native
+    control of the host operating system. For such elements, CSS properties
+    such as color, background-color, and border (that can be disregarded for
+    auto) should not be disregarded.
+
+  there is no requirement that this rendering is any different from the
+  automatic widget appearance of a drop-down select.
+  -->
 <div id="container">
 	<a>a</a>
 	<button>button</button>
diff --git a/tests/wpt/web-platform-tests/css/cssom-view/scrollingElement.html b/tests/wpt/web-platform-tests/css/cssom-view/scrollingElement.html
index a438541120d..84d313741ce 100644
--- a/tests/wpt/web-platform-tests/css/cssom-view/scrollingElement.html
+++ b/tests/wpt/web-platform-tests/css/cssom-view/scrollingElement.html
@@ -3,83 +3,120 @@
 <title>cssom-view - scrollingElement</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<iframe id="quirksframe"></iframe>
-<iframe id="nonquirksframe"></iframe>
 <div id="log"></div>
 <script>
-async_test(function() {
-  var quirksFrame = document.getElementById("quirksframe");
-  quirksFrame.onload = this.step_func_done(function() {
-    var quirksDoc = quirksFrame.contentDocument;
-    assert_equals(quirksDoc.compatMode, "BackCompat", "Should be in quirks mode.");
-    assert_not_equals(quirksDoc.body, null, "Should have a body element");
+function makeDescription(rootDisplay, bodyDisplay) {
+  let a = [];
+  if (rootDisplay) {
+    a.push(`root ${rootDisplay}`);
+  }
+  if (bodyDisplay) {
+    a.push(`body ${bodyDisplay}`);
+  }
+  let s = a.join(", ");
+  if (s) {
+    s = ` (${s})`;
+  }
+  return s;
+}
 
-    // Tests for quirks mode document.
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body,
-      "scrollingElement in quirks mode should default to body element.");
+function quirksTest(rootDisplay, bodyDisplay) {
+  async_test(function() {
+    let quirksFrame = document.createElement("iframe");
+    quirksFrame.onload = this.step_func_done(function() {
+      var quirksDoc = quirksFrame.contentDocument;
+      assert_equals(quirksDoc.compatMode, "BackCompat", "Should be in quirks mode.");
+      assert_not_equals(quirksDoc.body, null, "Should have a body element");
 
-    quirksDoc.documentElement.style.overflow = "scroll";
-    quirksDoc.body.style.overflow = "scroll";
-    assert_equals(quirksDoc.scrollingElement, null,
-      "scrollingElement in quirks mode should be null if overflow of body and root element isn't visible.");
-    quirksDoc.documentElement.style.overflow = "visible";
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
-    quirksDoc.documentElement.style.overflow = "scroll";
-    quirksDoc.body.style.overflow = "visible";
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
-    quirksDoc.documentElement.style.overflow = "visible";
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      quirksDoc.documentElement.style.display = rootDisplay;
+      quirksDoc.body.style.display = bodyDisplay;
 
-    quirksDoc.body.style.display = "none";
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body)
-    quirksDoc.body.style.display = "block";
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      // Tests for quirks mode document.
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body,
+        "scrollingElement in quirks mode should default to body element.");
 
-    quirksDoc.documentElement.appendChild(quirksDoc.createElement("body"));
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.getElementsByTagName("body")[0]);
-    quirksDoc.documentElement.removeChild(quirksDoc.documentElement.lastChild);
-    assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      quirksDoc.documentElement.style.overflow = "scroll";
+      quirksDoc.body.style.overflow = "scroll";
+      assert_equals(quirksDoc.scrollingElement, null,
+        "scrollingElement in quirks mode should be null if overflow of body and root element isn't visible.");
+      quirksDoc.documentElement.style.overflow = "visible";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      quirksDoc.documentElement.style.overflow = "scroll";
+      quirksDoc.body.style.overflow = "visible";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      quirksDoc.documentElement.style.overflow = "visible";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
 
-    quirksDoc.documentElement.removeChild(quirksDoc.body);
-    assert_equals(quirksDoc.scrollingElement, null);
-    quirksDoc.documentElement.appendChild(quirksDoc.createElementNS("foobarNS", "body"));
-    assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.body.style.display = "none";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body)
+      quirksDoc.body.style.display = "block";
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
 
-    quirksDoc.removeChild(quirksDoc.documentElement);
-    assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.documentElement.appendChild(quirksDoc.createElement("body"));
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.getElementsByTagName("body")[0]);
+      quirksDoc.documentElement.removeChild(quirksDoc.documentElement.lastChild);
+      assert_equals(quirksDoc.scrollingElement, quirksDoc.body);
 
-    quirksDoc.appendChild(quirksDoc.createElementNS("foobarNS", "html"));
-    quirksDoc.documentElement.appendChild(quirksDoc.createElement("body"));
-    assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.documentElement.removeChild(quirksDoc.body);
+      assert_equals(quirksDoc.scrollingElement, null);
+      quirksDoc.documentElement.appendChild(quirksDoc.createElementNS("foobarNS", "body"));
+      assert_equals(quirksDoc.scrollingElement, null);
 
-    quirksDoc.removeChild(quirksDoc.documentElement);
-    quirksDoc.appendChild(quirksDoc.createElement("body"));
-    assert_equals(quirksDoc.scrollingElement, null);
-  });
-  quirksFrame.src =
-    URL.createObjectURL(new Blob([""], { type: "text/html" }));
-}, "scrollingElement in quirks mode");
+      quirksDoc.removeChild(quirksDoc.documentElement);
+      assert_equals(quirksDoc.scrollingElement, null);
 
-async_test(function() {
-  var nonQuirksFrame = document.getElementById("nonquirksframe");
-  nonQuirksFrame.onload = this.step_func_done(function() {
-    var nonQuirksDoc = nonQuirksFrame.contentDocument;
-    assert_equals(nonQuirksDoc.compatMode, "CSS1Compat", "Should be in standards mode.");
-    assert_not_equals(nonQuirksDoc.body, null, "Should have a body element");
+      quirksDoc.appendChild(quirksDoc.createElementNS("foobarNS", "html"));
+      quirksDoc.documentElement.appendChild(quirksDoc.createElement("body"));
+      assert_equals(quirksDoc.scrollingElement, null);
 
-    assert_equals(nonQuirksDoc.scrollingElement, nonQuirksDoc.documentElement,
-      "scrollingElement in standards mode should be the document element.");
-    nonQuirksDoc.documentElement.style.overflow = "scroll";
-    nonQuirksDoc.body.style.overflow = "scroll";
-    assert_equals(nonQuirksDoc.scrollingElement, nonQuirksDoc.documentElement);
+      quirksDoc.removeChild(quirksDoc.documentElement);
+      quirksDoc.appendChild(quirksDoc.createElement("body"));
+      assert_equals(quirksDoc.scrollingElement, null);
 
-    nonQuirksDoc.removeChild(nonQuirksDoc.documentElement);
-    assert_equals(nonQuirksDoc.scrollingElement, null);
-    nonQuirksDoc.appendChild(nonQuirksDoc.createElement("foobar"));
-    assert_equals(nonQuirksDoc.scrollingElement.localName, "foobar");
-  });
-  nonQuirksFrame.src =
-    URL.createObjectURL(new Blob(["<!doctype html>"], { type: "text/html" }));
-}, "scrollingElement in no-quirks mode");
+      quirksFrame.remove();
+    });
+    quirksFrame.src =
+      URL.createObjectURL(new Blob([], { type: "text/html" }));
+    document.body.append(quirksFrame);
+  }, `scrollingElement in quirks mode${makeDescription(rootDisplay, bodyDisplay)}`);
+}
+
+function nonQuirksTest(rootDisplay, bodyDisplay) {
+  async_test(function() {
+    let nonQuirksFrame = document.createElement("iframe");
+    nonQuirksFrame.onload = this.step_func_done(function() {
+      var nonQuirksDoc = nonQuirksFrame.contentDocument;
+      assert_equals(nonQuirksDoc.compatMode, "CSS1Compat", "Should be in standards mode.");
+      assert_not_equals(nonQuirksDoc.body, null, "Should have a body element");
+
+      nonQuirksDoc.documentElement.style.display = rootDisplay;
+      nonQuirksDoc.body.style.display = bodyDisplay;
+
+      // Tests for non-quirks mode document.
+      assert_equals(nonQuirksDoc.scrollingElement, nonQuirksDoc.documentElement,
+        "scrollingElement in standards mode should be the document element.");
+      nonQuirksDoc.documentElement.style.overflow = "scroll";
+      nonQuirksDoc.body.style.overflow = "scroll";
+      assert_equals(nonQuirksDoc.scrollingElement, nonQuirksDoc.documentElement);
+
+      nonQuirksDoc.removeChild(nonQuirksDoc.documentElement);
+      assert_equals(nonQuirksDoc.scrollingElement, null);
+      nonQuirksDoc.appendChild(nonQuirksDoc.createElement("foobar"));
+      assert_equals(nonQuirksDoc.scrollingElement.localName, "foobar");
+
+      nonQuirksFrame.remove();
+    });
+    nonQuirksFrame.src =
+      URL.createObjectURL(new Blob([`<!doctype html>`], { type: "text/html" }));
+    document.body.append(nonQuirksFrame);
+  }, `scrollingElement in no-quirks mode ${makeDescription(rootDisplay, bodyDisplay)}`);
+}
+
+for (let rootDisplay of ["", "table"]) {
+  for (let bodyDisplay of ["", "table"]) {
+    quirksTest(rootDisplay, bodyDisplay);
+    nonQuirksTest(rootDisplay, bodyDisplay);
+  }
+}
 </script>
diff --git a/tests/wpt/web-platform-tests/css/cssom/CSS-namespace-object-class-string.html b/tests/wpt/web-platform-tests/css/cssom/CSS-namespace-object-class-string.html
new file mode 100644
index 00000000000..96c427f6cf2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/cssom/CSS-namespace-object-class-string.html
@@ -0,0 +1,47 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSSOM - Symbol.toStringTag value of CSS namespace object</title>
+<link rel="help" href="https://heycam.github.io/webidl/#es-namespaces">
+<link rel="help" href="https://drafts.csswg.org/cssom/#namespacedef-css">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+
+test(() => {
+  assert_own_property(CSS, Symbol.toStringTag);
+
+  const propDesc = Object.getOwnPropertyDescriptor(CSS, Symbol.toStringTag);
+  assert_equals(propDesc.value, "CSS", "value");
+  assert_equals(propDesc.writable, false, "writable");
+  assert_equals(propDesc.enumerable, false, "enumerable");
+  assert_equals(propDesc.configurable, true, "configurable");
+}, "@@toStringTag exists on the namespace object with the appropriate descriptor");
+
+test(() => {
+  assert_equals(CSS.toString(), "[object CSS]");
+  assert_equals(Object.prototype.toString.call(CSS), "[object CSS]");
+}, "Object.prototype.toString applied to the namespace object");
+
+test(t => {
+  assert_own_property(CSS, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(CSS, Symbol.toStringTag, { value: "CSS" });
+  });
+
+  Object.defineProperty(CSS, Symbol.toStringTag, { value: "Test" });
+  assert_equals(CSS.toString(), "[object Test]");
+  assert_equals(Object.prototype.toString.call(CSS), "[object Test]");
+}, "Object.prototype.toString applied after modifying the namespace object's @@toStringTag");
+
+test(t => {
+  assert_own_property(CSS, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(CSS, Symbol.toStringTag, { value: "CSS" });
+  });
+
+  assert_true(delete CSS[Symbol.toStringTag]);
+  assert_equals(CSS.toString(), "[object Object]");
+  assert_equals(Object.prototype.toString.call(CSS), "[object Object]");
+}, "Object.prototype.toString applied after deleting @@toStringTag");
+</script>
diff --git a/tests/wpt/web-platform-tests/gamepad/idlharness-extensions.window.js b/tests/wpt/web-platform-tests/gamepad/idlharness-extensions.window.js
new file mode 100644
index 00000000000..dcf76878fc9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/gamepad/idlharness-extensions.window.js
@@ -0,0 +1,12 @@
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+// META: timeout=long
+
+// https://w3c.github.io/gamepad/extensions.html
+
+'use strict';
+
+idl_test(
+  ['gamepad-extensions'],
+  ['gamepad'],
+);
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-resumes-onload.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-resumes-onload.html
new file mode 100644
index 00000000000..b166763d14f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-resumes-onload.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<title>resource selection should not delay the load event indefinitely</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<video></video>
+<script>
+async_test(function(t) {
+  const v = document.querySelector('video');
+  v.onloadstart = t.unreached_func("loadstart event should not be fired when the resource selection algorithm cannot determine mode");
+  const s = document.createElement('source');
+  v.appendChild(s); // this will trigger resource selection
+  v.removeChild(s); // force an early return in resource selection algorithm
+  window.onload = t.step_func_done(function() {
+    assert_equals(v.networkState, v.NETWORK_EMPTY);
+  });
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/interfaces/gamepad-extensions.idl b/tests/wpt/web-platform-tests/interfaces/gamepad-extensions.idl
new file mode 100644
index 00000000000..f2a2811b4b4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/interfaces/gamepad-extensions.idl
@@ -0,0 +1,39 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: Gamepad Extensions (https://w3c.github.io/gamepad/extensions.html)
+
+enum GamepadHand {
+  "",  /* unknown, both hands, or not applicable */
+  "left",
+  "right"
+};
+
+[Exposed=Window]
+interface GamepadHapticActuator {
+  readonly attribute GamepadHapticActuatorType type;
+  Promise<boolean> pulse(double value, double duration);
+};
+
+enum GamepadHapticActuatorType {
+  "vibration"
+};
+
+[Exposed=Window]
+interface GamepadPose {
+  readonly attribute boolean hasOrientation;
+  readonly attribute boolean hasPosition;
+
+  readonly attribute Float32Array? position;
+  readonly attribute Float32Array? linearVelocity;
+  readonly attribute Float32Array? linearAcceleration;
+  readonly attribute Float32Array? orientation;
+  readonly attribute Float32Array? angularVelocity;
+  readonly attribute Float32Array? angularAcceleration;
+};
+
+partial interface Gamepad {
+  readonly attribute GamepadHand hand;
+  readonly attribute FrozenArray<GamepadHapticActuator> hapticActuators;
+  readonly attribute GamepadPose? pose;
+};
diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
index 21906c57fd2..a053971000b 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/requirements_firefox.txt
@@ -1,4 +1,4 @@
-marionette_driver==3.0.0
+marionette_driver==3.1.0
 mozcrash==2.0.0
 mozinstall==2.0.0
 mozleak==0.2
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/namespace-object-class-string.any.js b/tests/wpt/web-platform-tests/wasm/jsapi/namespace-object-class-string.any.js
new file mode 100644
index 00000000000..2f63aca2c55
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/namespace-object-class-string.any.js
@@ -0,0 +1,40 @@
+"use strict";
+// https://heycam.github.io/webidl/#es-namespaces
+// https://webassembly.github.io/spec/js-api/#namespacedef-webassembly
+
+test(() => {
+  assert_own_property(WebAssembly, Symbol.toStringTag);
+
+  const propDesc = Object.getOwnPropertyDescriptor(WebAssembly, Symbol.toStringTag);
+  assert_equals(propDesc.value, "WebAssembly", "value");
+  assert_equals(propDesc.writable, false, "writable");
+  assert_equals(propDesc.enumerable, false, "enumerable");
+  assert_equals(propDesc.configurable, true, "configurable");
+}, "@@toStringTag exists on the namespace object with the appropriate descriptor");
+
+test(() => {
+  assert_equals(WebAssembly.toString(), "[object WebAssembly]");
+  assert_equals(Object.prototype.toString.call(WebAssembly), "[object WebAssembly]");
+}, "Object.prototype.toString applied to the namespace object");
+
+test(t => {
+  assert_own_property(WebAssembly, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(WebAssembly, Symbol.toStringTag, { value: "WebAssembly" });
+  });
+
+  Object.defineProperty(WebAssembly, Symbol.toStringTag, { value: "Test" });
+  assert_equals(WebAssembly.toString(), "[object Test]");
+  assert_equals(Object.prototype.toString.call(WebAssembly), "[object Test]");
+}, "Object.prototype.toString applied after modifying the namespace object's @@toStringTag");
+
+test(t => {
+  assert_own_property(WebAssembly, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object");
+  t.add_cleanup(() => {
+    Object.defineProperty(WebAssembly, Symbol.toStringTag, { value: "WebAssembly" });
+  });
+
+  assert_true(delete WebAssembly[Symbol.toStringTag]);
+  assert_equals(WebAssembly.toString(), "[object Object]");
+  assert_equals(Object.prototype.toString.call(WebAssembly), "[object Object]");
+}, "Object.prototype.toString applied after deleting @@toStringTag");
diff --git a/tests/wpt/webgl/meta/conformance2/rendering/draw-buffers.html.ini b/tests/wpt/webgl/meta/conformance2/rendering/draw-buffers.html.ini
index 3abb65ed930..729be6ed0b6 100644
--- a/tests/wpt/webgl/meta/conformance2/rendering/draw-buffers.html.ini
+++ b/tests/wpt/webgl/meta/conformance2/rendering/draw-buffers.html.ini
@@ -203,3 +203,6 @@
   [WebGL test #42: attachment 5 should be 0,255,0,255\nat (4, 0) expected: 0,255,0,255 was 255,0,0,0]
     expected: FAIL
 
+  [WebGL test #51: attachment 6 should be 0,255,0,255\nat (0, 0) expected: 0,255,0,255 was 0,0,0,255]
+    expected: FAIL
+