diff --git a/tests/wpt/metadata-layout-2020/FileAPI/idlharness.html.ini b/tests/wpt/metadata-layout-2020/FileAPI/idlharness.html.ini
new file mode 100644
index 00000000000..1b0b6b3e655
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/FileAPI/idlharness.html.ini
@@ -0,0 +1,16 @@
+[idlharness.html]
+  [Blob interface: operation text()]
+    expected: FAIL
+
+  [Blob interface: operation stream()]
+    expected: FAIL
+
+  [idl_test setup]
+    expected: FAIL
+
+  [Blob interface: operation arrayBuffer()]
+    expected: FAIL
+
+  [FileReader interface: operation readAsBinaryString(Blob)]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/FileAPI/idlharness.worker.js.ini b/tests/wpt/metadata-layout-2020/FileAPI/idlharness.worker.js.ini
new file mode 100644
index 00000000000..ecae4702306
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/FileAPI/idlharness.worker.js.ini
@@ -0,0 +1,16 @@
+[idlharness.worker.html]
+  [Blob interface: operation text()]
+    expected: FAIL
+
+  [Blob interface: operation stream()]
+    expected: FAIL
+
+  [idl_test setup]
+    expected: FAIL
+
+  [Blob interface: operation arrayBuffer()]
+    expected: FAIL
+
+  [FileReader interface: operation readAsBinaryString(Blob)]
+    expected: FAIL
+
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 3605e8f3fc9..76b44d9e9cf 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: TIMEOUT
+    expected: FAIL
 
   [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
new file mode 100644
index 00000000000..f64b45fea6b
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/align-content_stretch.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/align-content_stretch.html.ini
deleted file mode 100644
index 144d0ff6fe1..00000000000
--- a/tests/wpt/metadata-layout-2020/css/css-flexbox/align-content_stretch.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[align-content_stretch.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-017.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-017.html.ini
new file mode 100644
index 00000000000..ea76e5ee892
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-017.html.ini
@@ -0,0 +1,4 @@
+[gap-017.html]
+  [.button 1]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-018.html.ini b/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-018.html.ini
new file mode 100644
index 00000000000..90aedd2e763
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-flexbox/gap-018.html.ini
@@ -0,0 +1,4 @@
+[gap-018.html]
+  [.button 1]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
index f8e7e539aae..4a1e8110f6f 100644
--- a/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPosition.html.ini
index 23c61ede1a1..c131078eace 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
@@ -17,6 +17,3 @@
   [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-invalid-cases.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
new file mode 100644
index 00000000000..e181af5397f
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
@@ -0,0 +1,4 @@
+[elementsFromPoint-invalid-cases.html]
+  [The root element is the last element returned for otherwise empty queries within the viewport]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
index 45789ac5aae..fe0cc487976 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
@@ -315,24 +315,18 @@
   [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: separate response Content-Type: text/plain */*]
+    expected: FAIL
+
+  [<iframe>: combined 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 258fe374697..a5b9b3752be 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
@@ -53,9 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
-  [separate text/javascript ]
+  [separate text/javascript;charset=windows-1252  text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.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-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
rename to tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
index dc2e45516de..385376c7321 100644
--- 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_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-layout-2020/html/dom/idlharness.https.html.ini b/tests/wpt/metadata-layout-2020/html/dom/idlharness.https.html.ini
index 82807aee0b9..2d66929f9f8 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
@@ -1247,6 +1247,9 @@
   [ElementInternals interface: operation setFormValue((File or USVString or FormData)?, optional (File or USVString or FormData)?)]
     expected: FAIL
 
+  [ElementInternals interface: operation setValidity(optional ValidityStateFlags, optional DOMString, optional HTMLElement)]
+    expected: FAIL
+
 
 [idlharness.https.html?include=(Document|Window)]
   [Document interface: documentWithHandlers must inherit property "queryCommandEnabled(DOMString)" with the proper type]
@@ -1324,9 +1327,6 @@
   [Document interface: new Document() must inherit property "designMode" with the proper type]
     expected: FAIL
 
-  [Window interface: window must inherit property "createImageBitmap(ImageBitmapSource, optional ImageBitmapOptions)" with the proper type]
-    expected: FAIL
-
   [Window interface: attribute locationbar]
     expected: FAIL
 
@@ -1429,9 +1429,6 @@
   [Window interface: attribute onwebkitanimationiteration]
     expected: FAIL
 
-  [Window interface: window must inherit property "createImageBitmap(ImageBitmapSource, long, long, long, long, optional ImageBitmapOptions)" with the proper type]
-    expected: FAIL
-
   [Window interface: window must inherit property "scrollbars" with the proper type]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini b/tests/wpt/metadata-layout-2020/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini
new file mode 100644
index 00000000000..e23d11f1829
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini
@@ -0,0 +1,2 @@
+[table-row-group-height.html]
+  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 4df5d7a35de..daa518bd0e3 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
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 93673c2a0db..295031c1812 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
 
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/iframe_005.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
new file mode 100644
index 00000000000..6cf9d13975c
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
@@ -0,0 +1,4 @@
+[iframe_005.html]
+  [document.write external script into iframe write back into parent]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/idlharness.any.js.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/idlharness.any.js.ini
new file mode 100644
index 00000000000..d0165c49bd2
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/idlharness.any.js.ini
@@ -0,0 +1,9 @@
+[idlharness.any.worker.html]
+  [wasm-js-api interfaces.]
+    expected: FAIL
+
+
+[idlharness.any.html]
+  [wasm-js-api interfaces.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/wasm/jsapi/prototypes.any.js.ini b/tests/wpt/metadata-layout-2020/wasm/jsapi/prototypes.any.js.ini
new file mode 100644
index 00000000000..71837c4e8f5
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/wasm/jsapi/prototypes.any.js.ini
@@ -0,0 +1,33 @@
+[prototypes.any.html]
+  [_Module]
+    expected: FAIL
+
+  [_Instance]
+    expected: FAIL
+
+  [_Global]
+    expected: FAIL
+
+  [_Table]
+    expected: FAIL
+
+  [_Memory]
+    expected: FAIL
+
+
+[prototypes.any.worker.html]
+  [_Module]
+    expected: FAIL
+
+  [_Instance]
+    expected: FAIL
+
+  [_Global]
+    expected: FAIL
+
+  [_Table]
+    expected: FAIL
+
+  [_Memory]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini
new file mode 100644
index 00000000000..b145905f63e
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini
@@ -0,0 +1,40 @@
+[k-rate-biquad-connection.html]
+  [< [Gain AudioParam\] 1 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [< [Detune AudioParam\] 2 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [X All k-rate AudioParams does not equal [0,0.3311063051223755,0.6248595118522644,0.8481203317642212,0.9757021069526672,0.9932119250297546,0.8986744284629822,0.7027547359466553,0.42755505442619324,0.1041216030716896,-0.23105813562870026,-0.5401715040206909,-0.7883464694023132,-0.9475855827331543,-0.9999247193336487,-0.9394592046737671...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[640\]\t8.2034111022949219e-1\t7.7920007705688477e-1\t4.1141033172607422e-2\t5.2799061991884222e-2\t0.0000000000000000e+0\n\t[641\]\t5.5707097053527832e-1\t4.6239438652992249e-1\t9.4676584005355835e-2\t2.0475288360627431e-1\t0.0000000000000000e+0\n\t[642\]\t2.5545451045036316e-1\t1.8853309750556946e-1\t6.6921412944793701e-2\t3.5495843345392858e-1\t0.0000000000000000e+0\n\t[643\]\t-6.9336682558059692e-2\t-1.7021611332893372e-1\t1.0087943077087402e-1\t5.9265500073973498e-1\t0.0000000000000000e+0\n\t[644\]\t-3.9448010921478271e-1\t-4.7897621989250183e-1\t8.4496110677719116e-2\t1.7640982405490371e-1\t0.0000000000000000e+0\n\t...and 991 more errors.\n\tMax AbsError of 1.6447335481643677e-1 at index of 785.\n\t[785\]\t3.4482055902481079e-1\t5.0929391384124756e-1\t1.6447335481643677e-1\t3.2294388435928745e-1\t0.0000000000000000e+0\n\tMax RelError of 2.2756960801624473e+1 at index of 867.\n\t[867\]\t1.4153416454792023e-1\t5.9575871564447880e-3\t1.3557657739147544e-1\t2.2756960801624473e+1\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [X k-rate Q with input: output[2048:\] does not equal [-0.007429864257574081,-0.003294537542387843,0.0019048331305384636,0.003956870641559362,0.0035721869207918644,0.004832542035728693,0.008425349369645119,0.010273684747517109,0.007734519429504871,0.003703415160998702,0.0022171076852828264,0.0024073002859950066,0.0002190780360251665,-0.004831020720303059,-0.00846010260283947,-0.007902969606220722...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t1.3721437426283956e-3\t-7.4298642575740814e-3\t8.8020080002024770e-3\t1.1846795170220799e+0\t0.0000000000000000e+0\n\t[1\]\t2.7593520935624838e-3\t-3.2945375423878431e-3\t6.0538896359503269e-3\t1.8375536954915186e+0\t0.0000000000000000e+0\n\t[2\]\t4.5378590002655983e-3\t1.9048331305384636e-3\t2.6330258697271347e-3\t1.3822868930166201e+0\t0.0000000000000000e+0\n\t[3\]\t2.8837921563535929e-3\t3.9568706415593624e-3\t1.0730784852057695e-3\t2.7119372413521214e-1\t0.0000000000000000e+0\n\t[4\]\t-1.0738879209384322e-3\t3.5721869207918644e-3\t4.6460748417302966e-3\t1.3006247838510026e+0\t0.0000000000000000e+0\n\t...and 2043 more errors.\n\tMax AbsError of 1.0892769030760974e-2 at index of 7.\n\t[7\]\t-6.1908428324386477e-4\t1.0273684747517109e-2\t1.0892769030760974e-2\t1.0602592252398519e+0\t0.0000000000000000e+0\n\tMax RelError of 2.0715534970620170e+3 at index of 217.\n\t[217\]\t4.6172837028279901e-4\t-2.2299755642052332e-7\t4.6195136783921953e-4\t2.0715534970620170e+3\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [Frequency AudioParam\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate gain with input: output[0,2048\] does not equal [0,0.9757021069526672,0.42755505442619324,-0.7883464694023132,-0.7730104327201843,0.4496113359928131,0.9700312614440918,-0.02454114705324173,-0.9807852506637573,-0.40524137020111084,0.803207516670227,0.7572088241577148,-0.4713967740535736,-0.9637761116027832,0.049067676067352295,0.9852776527404785...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t3.2094421330839396e-3\t-8.7422776573475858e-8\t3.2095295558605130e-3\t3.6712738735345622e+4\t0.0000000000000000e+0\n\t[129\]\t-9.5966094732284546e-1\t-9.7570210695266724e-1\t1.6041159629821777e-2\t1.6440632356449301e-2\t0.0000000000000000e+0\n\t[130\]\t-4.2053195834159851e-1\t-4.2755520343780518e-1\t7.0232450962066650e-3\t1.6426522329129622e-2\t0.0000000000000000e+0\n\t[131\]\t7.6242697238922119e-1\t7.8834640979766846e-1\t2.5919437408447266e-2\t3.2878233586551842e-2\t0.0000000000000000e+0\n\t[132\]\t7.4586772918701172e-1\t7.7301049232482910e-1\t2.7142763137817383e-2\t3.5113059146436060e-2\t0.0000000000000000e+0\n\t...and 921 more errors.\n\tMax AbsError of 5.3484499454498291e-1 at index of 255.\n\t[255\]\t-4.4085711240768433e-1\t-9.7570210695266724e-1\t5.3484499454498291e-1\t5.4816423038730722e-1\t0.0000000000000000e+0\n\tMax RelError of 3.6712738735345622e+4 at index of 128.\n]
+    expected: FAIL
+
+  [X k-rate frequency with input: output[0,2048\] does not equal [0,0.02839340642094612,0.1450495570898056,0.36942505836486816,0.6520541310310364,0.9131435751914978,1.0783559083938599,1.1012734174728394,0.9707123637199402,0.7065789699554443,0.3498469293117523,-0.048511650413274765,-0.4367612302303314,-0.7688571810722351,-1.0084279775619507,-1.131049394607544...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t-1.1191306114196777e+0\t-1.0972596406936646e+0\t2.1870970726013184e-2\t1.9932356859664331e-2\t0.0000000000000000e+0\n\t[129\]\t-9.9151837825775146e-1\t-9.3471795320510864e-1\t5.6800425052642822e-2\t6.0767448467076671e-2\t0.0000000000000000e+0\n\t[130\]\t-7.5953400135040283e-1\t-6.6672790050506592e-1\t9.2806100845336914e-2\t1.3919636597633545e-1\t0.0000000000000000e+0\n\t[131\]\t-4.4247153401374817e-1\t-3.2352218031883240e-1\t1.1894935369491577e-1\t3.6766985675507846e-1\t0.0000000000000000e+0\n\t[132\]\t-7.1794092655181885e-2\t5.6181102991104126e-2\t1.2797519564628601e-1\t2.2779046482328758e+0\t0.0000000000000000e+0\n\t...and 891 more errors.\n\tMax AbsError of 4.1948493570089340e-1 at index of 649.\n\t[649\]\t-3.7298277020454407e-3\t-4.2321476340293884e-1\t4.1948493570089340e-1\t9.9118691495529354e-1\t0.0000000000000000e+0\n\tMax RelError of 1.1267462635054815e+2 at index of 553.\n\t[553\]\t3.3036437630653381e-1\t2.9062279500067234e-3\t3.2745814835652709e-1\t1.1267462635054815e+2\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [Q AudioParam\] 2 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate detune with input: output[2048:\] does not equal [-0.5481402277946472,-0.548226535320282,-0.548312246799469,-0.5483972430229187,-0.5484814047813416,-0.5485645532608032,-0.5486468076705933,-0.5487281680107117,-0.5488086938858032,-0.5488886833190918,-0.5489681363105774,-0.5490474104881287,-0.5491266250610352,-0.5492058992385864,-0.5492852926254272,-0.5493649244308472...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t3.0814451747573912e-4\t-5.4814022779464722e-1\t5.4844837231212296e-1\t1.0005621636615059e+0\t0.0000000000000000e+0\n\t[1\]\t2.8959027258679271e-4\t-5.4822653532028198e-1\t5.4851612559286878e-1\t1.0005282310394144e+0\t0.0000000000000000e+0\n\t[2\]\t2.7123777545057237e-4\t-5.4831224679946899e-1\t5.4858348457491957e-1\t1.0004946775802179e+0\t0.0000000000000000e+0\n\t[3\]\t2.5325475144200027e-4\t-5.4839724302291870e-1\t5.4865049777436070e-1\t1.0004618089435424e+0\t0.0000000000000000e+0\n\t[4\]\t2.3576857347507030e-4\t-5.4848140478134155e-1\t5.4871717335481662e-1\t1.0004298570041203e+0\t0.0000000000000000e+0\n\t...and 2043 more errors.\n\tMax AbsError of 5.5494355945847929e-1 at index of 195.\n\t[195\]\t-2.7666112873703241e-3\t-5.5771017074584961e-1\t5.5494355945847929e-1\t9.9503933865206295e-1\t0.0000000000000000e+0\n\tMax RelError of 1.0005621636615059e+0 at index of 0.\n]
+    expected: FAIL
+
+  [< [All k-rate inputs\] 1 out of 44 assertions were failed.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 5 out of 5 tasks were failed.]
+    expected: FAIL
+
+  [X k-rate Q with input: output[0,2048\] does not equal [0,0.9757021069526672,0.42755505442619324,-0.7883464694023132,-0.7730104327201843,0.4496113359928131,0.9700312614440918,-0.02454114705324173,-0.9807852506637573,-0.40524137020111084,0.803207516670227,0.7572088241577148,-0.4713967740535736,-0.9637761116027832,0.049067676067352295,0.9852776527404785...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t1.3951719999313354e+0\t-8.7422776573475858e-8\t1.3951720873541120e+0\t1.5958908445118047e+7\t0.0000000000000000e+0\n\t[129\]\t1.6225984096527100e+0\t-9.7570210695266724e-1\t2.5983005166053772e+0\t2.6630059503719248e+0\t0.0000000000000000e+0\n\t[130\]\t1.6577711105346680e+0\t-4.2755520343780518e-1\t2.0853263139724731e+0\t4.8773264766869282e+0\t0.0000000000000000e+0\n\t[131\]\t1.5306757688522339e+0\t7.8834640979766846e-1\t7.4232935905456543e-1\t9.4162838801420634e-1\t0.0000000000000000e+0\n\t[132\]\t1.2523171901702881e+0\t7.7301049232482910e-1\t4.7930669784545898e-1\t6.2005199490105767e-1\t0.0000000000000000e+0\n\t...and 1915 more errors.\n\tMax AbsError of 2.5983005166053772e+0 at index of 129.\n\tMax RelError of 1.5958908445118047e+7 at index of 128.\n]
+    expected: FAIL
+
+  [X k-rate detune with input: output[0,2048\] does not equal [0,0.12810896337032318,0.47732436656951904,0.8133140802383423,0.9599840044975281,0.9983929991722107,0.9618627429008484,0.8107287883758545,0.5545527338981628,0.24036024510860443,-0.09643325209617615,-0.424831748008728,-0.7066475749015808,-0.9075677990913391,-1.0057729482650757,-0.9910215139389038...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t-9.0901952981948853e-1\t-8.0834698677062988e-1\t1.0067254304885864e-1\t1.2454124861781007e-1\t0.0000000000000000e+0\n\t[129\]\t-8.0550211668014526e-1\t-5.6012439727783203e-1\t2.4537771940231323e-1\t4.3807718534460011e-1\t0.0000000000000000e+0\n\t[130\]\t-6.2269222736358643e-1\t-2.4871249496936798e-1\t3.7397973239421844e-1\t1.5036628233747511e+0\t0.0000000000000000e+0\n\t[131\]\t-3.5228535532951355e-1\t9.0757519006729126e-2\t4.4304287433624268e-1\t4.8816106828944248e+0\t0.0000000000000000e+0\n\t[132\]\t-1.3693822547793388e-2\t4.1998896002769470e-1\t4.3368278257548809e-1\t1.0326051964482361e+0\t0.0000000000000000e+0\n\t...and 1915 more errors.\n\tMax AbsError of 2.1426951885223389e+0 at index of 391.\n\t[391\]\t6.9794428348541260e-1\t-1.4447509050369263e+0\t2.1426951885223389e+0\t1.4830897015202589e+0\t0.0000000000000000e+0\n\tMax RelError of 2.4604596714524988e+2 at index of 272.\n\t[272\]\t9.5641678571701050e-1\t-3.9030096959322691e-3\t9.6031979541294277e-1\t2.4604596714524988e+2\t0.0000000000000000e+0\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini b/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
index daa7a8c41bc..10dda3a6659 100644
--- a/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/workers/shared-worker-in-data-url-context.window.js.ini
@@ -1,8 +1,7 @@
 [shared-worker-in-data-url-context.window.html]
-  expected: TIMEOUT
   [Create a shared worker in a data url frame]
     expected: FAIL
 
   [Create a data url shared worker in a data url frame]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/FileAPI/idlharness.html.ini b/tests/wpt/metadata/FileAPI/idlharness.html.ini
index a19d956ea41..d95d98d2f68 100644
--- a/tests/wpt/metadata/FileAPI/idlharness.html.ini
+++ b/tests/wpt/metadata/FileAPI/idlharness.html.ini
@@ -33,3 +33,6 @@
   [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "stream()" with the proper type]
     expected: FAIL
 
+  [idl_test setup]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini b/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
index b8d0a66f512..f965fff1cd6 100644
--- a/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
+++ b/tests/wpt/metadata/FileAPI/idlharness.worker.js.ini
@@ -45,3 +45,6 @@
   [Blob interface: new File(["myFileBits"\], "myFileName") must inherit property "stream()" with the proper type]
     expected: FAIL
 
+  [idl_test setup]
+    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 faa00f45ecf..d4f62ed7113 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: TIMEOUT
+    expected: FAIL
 
   [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 fd7e25ae49b..d35ece1af97 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -38,6 +38,13 @@
        null,
        {}
       ]
+     ],
+     "webkit-writing-mode-crash.html": [
+      "8c851a7572e4568816bd3ee05669d72ba50be67f",
+      [
+       null,
+       {}
+      ]
      ]
     },
     "css-break": {
@@ -131285,12 +131292,12 @@
       ]
      ],
      "align-content_stretch.html": [
-      "674196f7404a7e1a15964d2b4d7c40345559bc0c",
+      "3acc57a2f329dd6b18a1034af11567ffe2aa7efc",
       [
        null,
        [
         [
-         "/css/css-flexbox/reference/align-content_space-stretch-ref.html",
+         "/css/css-flexbox/reference/align-content_stretch-ref.html",
          "=="
         ]
        ],
@@ -163124,6 +163131,123 @@
     },
     "css-sizing": {
      "aspect-ratio": {
+      "auto-margins-001.tentative.html": [
+       "9e89ab6ca7f5220ea030aa537bcb3b64f156043d",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-001.tentative.html": [
+       "456e0b348a270077afeed1d82b3b27b33f88f775",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-002.tentative.html": [
+       "2dc374c9f2d568f15f0de3493ea8097b385b9a5f",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-003.tentative.html": [
+       "987629d2e836028d8111dcdd8b1b0bd3a788e0e2",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-004.tentative.html": [
+       "99e92d409399639e6f71f99d6ab8425f9274a589",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-005.tentative.html": [
+       "dcee7cd10c5db3c61af7d109695f087fa0424d53",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-006.tentative.html": [
+       "0cde4d4dd95c20cf0a6a1b6d3f171ea1d5362124",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-007.tentative.html": [
+       "bc79a8f6ef3baf7c3baeeb6623862a9818dc1fcf",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-008.tentative.html": [
+       "8575d96c769cc585c186efe634906d8c80285a86",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "flex-aspect-ratio-001.tentative.html": [
        "3b477e299ad763a1c0108e16f05981c76c25bb77",
        [
@@ -163201,6 +163325,19 @@
         ],
         {}
        ]
+      ],
+      "flex-aspect-ratio-007.tentative.html": [
+       "c7144c3cf67c56459d670be2f12631898151b43b",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "auto-scrollbar-inside-stf-abspos.html": [
@@ -164024,6 +164161,32 @@
        {}
       ]
      ],
+     "intrinsic-percent-replaced-dynamic-009.html": [
+      "0c7a411a7284c69d6bdbf025245b20148351aad9",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square-only.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "intrinsic-percent-replaced-dynamic-010.html": [
+      "04c154e8fcdb8b176d7e82c177fd43aa5d4f8b25",
+      [
+       null,
+       [
+        [
+         "/css/reference/ref-filled-green-100px-square-only.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "ortho-writing-mode-001.html": [
       "9342802645faa7b57a12ce4b8ef17d755fcaface",
       [
@@ -230579,6 +230742,19 @@
          {}
         ]
        ],
+       "table-row-group-height.html": [
+        "b58311dd72364d7fe51eb4d454918fce33bdc83f",
+        [
+         null,
+         [
+          [
+           "/html/rendering/non-replaced-elements/tables/table-row-group-height-ref.html",
+           "=="
+          ]
+         ],
+         {}
+        ]
+       ],
        "table-width-150percent.html": [
         "9a5e108505ed4543c892b1319b4638541bd78f17",
         [
@@ -242056,7 +242232,7 @@
     []
    ],
    "README.md": [
-    "b3782c2c33948d3287cc6f4fcf111cd50d29deea",
+    "1babc2f1e6fe8219af57d94a490a5533bd919091",
     []
    ],
    "WebCryptoAPI": {
@@ -244681,7 +244857,7 @@
      []
     ],
     "accept-ch-cache-revalidation.https.html.headers": [
-     "05b7a4a6f6fcb91b18f2a0e767010e81c9329fb8",
+     "d54a29a3f91fd40377dc0162b55f16022248d35e",
      []
     ],
     "accept-ch-feature-policy-navigation.https.html.headers": [
@@ -244810,7 +244986,7 @@
       []
      ],
      "echo-ua-client-hints-received.py": [
-      "4af98c75ccedebe10aa02f17881099e95af1527f",
+      "57cf50457d352dec9bcda9be8847c9e66c9e25cc",
       []
      ],
      "expect-client-hints-headers-iframe.py": [
@@ -244846,12 +245022,12 @@
       []
      ],
      "stale-echo-client-hints.py": [
-      "769fa909fa4b3b960fbde2e6df282efc970b35d0",
+      "0d0d4a44a9851f0dfb794810f3387517ea780c12",
       []
      ]
     },
     "sec-ch-quotes.https.html.headers": [
-     "703b5ad9bf94fd4b4986e2dcd48213ae6429878e",
+     "1e99ac7203b350ea80c24f4737ede4363fa8efeb",
      []
     ]
    },
@@ -263977,6 +264153,10 @@
       "b7affbe7d41dd9e7bf555aa151cf6d31fb2279a9",
       []
      ],
+     "post-redirect-stacktrace.https.html.headers": [
+      "644ed867f3303048120bc72e4ca5a5ede3fa6d3b",
+      []
+     ],
      "report-and-enforce.html.sub.headers": [
       "5d4c5dcc4f61f16a93548e9ee18d915bbd2d3dd3",
       []
@@ -264057,6 +264237,10 @@
       "set-cookie.py": [
        "7f321a5c39d749d0695866cc497bd861c5e0ba96",
        []
+      ],
+      "throw-function.js": [
+       "d0e9d203dd52fc6cee490b0516b1f20dcd3a1d16",
+       []
       ]
      }
     },
@@ -287968,8 +288152,8 @@
        "97b56e23ef0d9efe91edd37250b1ce2df4400edd",
        []
       ],
-      "align-content_space-stretch-ref.html": [
-       "ca611a2ee702465fb88f8c1d3f9314353b7b7d99",
+      "align-content_stretch-ref.html": [
+       "f66a1ad9595a746c902f28990db8101ed23df9d5",
        []
       ],
       "align-items-baseline-overflow-non-visible-ref.html": [
@@ -317608,7 +317792,7 @@
       []
      ],
      "event-timing-test-utils.js": [
-      "bceaa5053d55efb8d86d5d70acb5b872bfbaf45a",
+      "9f4a81714f71b554fdc7bda19405fe2efd4b3376",
       []
      ],
      "slow-image.py": [
@@ -322323,7 +322507,7 @@
        []
       ],
       "gentestutils.py": [
-       "a424e63976cabba2b139330854978f96d65e66c4",
+       "32147318d0a2c16cb03b84d3e171ceaa8d998407",
        []
       ],
       "name2dir-offscreen.yaml": [
@@ -322355,11 +322539,11 @@
        []
       ],
       "tests2d-offscreen.yaml": [
-       "5fe168a66d572f2b3d8e33f3982d70702db849e3",
+       "6e8fb7707f7ccd95a9ae8789d0aefd9c12b170ee",
        []
       ],
       "tests2d.yaml": [
-       "39a75cfa97b71f1f538e5c14c16fe3daa630c34c",
+       "2bbc1986e2376afe1f8f2ca5b54c5368dceae272",
        []
       ],
       "tests2dtext.yaml": [
@@ -327297,6 +327481,10 @@
         "0f3e03f9ba1ac8a1ae0c90da87f5eee68f7ec82f",
         []
        ],
+       "table-row-group-height-ref.html": [
+        "e5279080f0875ef323774a4c1d83e4242f47b3fa",
+        []
+       ],
        "table-width-150percent-ref.html": [
         "820c360e391694732cce6cac0648a04a0f89f64d",
         []
@@ -330605,6 +330793,10 @@
       "propagation-sameorigin-child.html": [
        "69ad50cb717d118c9fd8cf9c4c1f6ba5b004e136",
        []
+      ],
+      "utils.js": [
+       "06bf01832838098b79a419fb32c4a6ec1657f01f",
+       []
       ]
      }
     },
@@ -331880,7 +332072,7 @@
     },
     "testdriver": {
      "file_upload.py": [
-      "32633679a9f33d516398f811d888cabf9b062b90",
+      "89ed67a79efdef5e6febc9df225774345341cea8",
       []
      ],
      "file_upload_data.txt": [
@@ -332183,7 +332375,7 @@
      []
     ],
     "html.idl": [
-     "c9018f1b63decf799cef7274c3f402d56b47fbef",
+     "7b2a96ce6760a05b49e9c445b4050a991acd342b",
      []
     ],
     "image-capture.idl": [
@@ -332318,6 +332510,10 @@
      "d3783858578c881b352e571deeb8cc4c9f0e6454",
      []
     ],
+    "periodic-background-sync.idl": [
+     "14ee8bbc30df1e6fd292db7e52504a2d3ce84d5b",
+     []
+    ],
     "permissions-request.idl": [
      "08431fbab85ab9838278c2e2d0dd9ad411f1d5de",
      []
@@ -337605,7 +337801,7 @@
      ]
     },
     "idlharness.js": [
-     "139ee5e167f247bdd03e0615dc7671a24bf349f5",
+     "02233ee0d33de23a5bdfb36db550c751b1c2cabd",
      []
     ],
     "idlharness.js.headers": [
@@ -338037,7 +338233,7 @@
      []
     ],
     "testharness.js": [
-     "360ed5d845b000deb8e3d58649a188eb9a861731",
+     "bd7a8bab0057ed3290ea49635b05f0be50236f29",
      []
     ],
     "testharness.js.headers": [
@@ -338059,7 +338255,7 @@
        []
       ],
       "webidl2.js": [
-       "2a174c92ebe67d62bc5273556f9cca03de332d05",
+       "d707905fa63e16886e4b89e6a403cdac62d7dadd",
        []
       ],
       "webidl2.js.headers": [
@@ -348950,7 +349146,7 @@
         ]
        },
        "test_cookies.py": [
-        "2e2d0d6771ba26a1fbe7e8fc8bb2e2598bc34223",
+        "64eab2d806b52de933b28d58416b69d36bdcb25e",
         []
        ],
        "test_handlers.py": [
@@ -348978,7 +349174,7 @@
         []
        ],
        "test_stash.py": [
-        "309dd9e577a0335b7a56992c82a48b43a259a28d",
+        "1c4c9ad933a37746623a0195f553ad8cfe70688f",
         []
        ]
       },
@@ -349021,7 +349217,7 @@
        []
       ],
       "pipes.py": [
-       "569875bf972819d526022fc590c55fc621c02485",
+       "bbf25e6fe1112e181da5a7b6a9c6ee2b7563abbe",
        []
       ],
       "ranges.py": [
@@ -349029,11 +349225,11 @@
        []
       ],
       "request.py": [
-       "89d52a9817edb0f609c3d4c1c9453dde1a149643",
+       "7c4d02d6de6f1a0b0eccc05ab0304cffbc10f959",
        []
       ],
       "response.py": [
-       "3a60c2babb39d8d77999022a7fb4d184cb019aa8",
+       "f4009702f68ed06bdf863b6d701dd292cdb0259f",
        []
       ],
       "router.py": [
@@ -349067,11 +349263,11 @@
        ]
       },
       "stash.py": [
-       "541aced6010ad2792c41eada7cfca3a9e31ab9e2",
+       "6b351847491bfee1f8e17a42127c88be97a62923",
        []
       ],
       "utils.py": [
-       "64b08a27aa8b33d4cea8677b30d33096cae212d5",
+       "b005b417d743f20f065c195e743d8abcfb04adfc",
        []
       ],
       "wptserve.py": [
@@ -371375,7 +371571,7 @@
      ]
     ],
     "accept-ch-cache-revalidation.https.html": [
-     "1bbf5aa6de67221968a6c6029e88e7202aff8544",
+     "453b6fc5fe609fa786a57246132d560c5e214f8a",
      [
       null,
       {}
@@ -371598,7 +371794,7 @@
      ]
     ],
     "sec-ch-quotes.https.html": [
-     "81fe09fb0494b1854c13b93606248ee0920777dd",
+     "d60bf4c9b670a94d3c7c991c6aed5aac73a844f4",
      [
       null,
       {}
@@ -374339,6 +374535,13 @@
        {}
       ]
      ],
+     "post-redirect-stacktrace.https.html": [
+      "f4196f0c5645ba38be5da099d7fd20c626936c91",
+      [
+       null,
+       {}
+      ]
+     ],
      "report-and-enforce.html": [
       "910df20a4c22a049e90fb62fc668f467808767f8",
       [
@@ -376272,7 +376475,7 @@
      ]
     ],
     "cookieStore_delete_arguments.tentative.https.any.js": [
-     "e2fca75850dfea20ed4481a1d3949e48a0709955",
+     "f1763ad7cbecaf36caaf583f3681288b09e6e43b",
      [
       "cookie-store/cookieStore_delete_arguments.tentative.https.any.html",
       {
@@ -381671,6 +381874,20 @@
        {}
       ]
      ],
+     "gap-017.html": [
+      "446d16dfa64de62058eee223d83208ac7318499f",
+      [
+       null,
+       {}
+      ]
+     ],
+     "gap-018.html": [
+      "4065f4ece8e0627cfbcde6a19c2d54827c98560d",
+      [
+       null,
+       {}
+      ]
+     ],
      "getcomputedstyle": {
       "flexbox_computedstyle_align-content-center.html": [
        "cd7ed7ae2d7bc7f23a14d754a86cc2b63979a7bf",
@@ -389273,6 +389490,13 @@
        {}
       ]
      ],
+     "marker-reverted-styles.html": [
+      "4e8b1228c50faca40f4807c8d1810bdb0af5d10b",
+      [
+       null,
+       {}
+      ]
+     ],
      "parsing": {
       "marker-supported-properties-in-animation.html": [
        "faf7c904fb04460ad08cc7b8a0e9d3504bbfe158",
@@ -391394,7 +391618,21 @@
          {}
         ]
        ]
-      }
+      },
+      "quirks-mode-001.tentative.html": [
+       "a1222208aba3ac779d5860607ff3e278c173a8ea",
+       [
+        null,
+        {}
+       ]
+      ],
+      "quirks-mode-002.tentative.html": [
+       "7c8bcac07ad8fba21ed11f85fd244757dcc0485e",
+       [
+        null,
+        {}
+       ]
+      ]
      },
      "aspect-ratio-affects-container-width-when-height-changes.html": [
       "0dbbb2f9404da7cfa89f2e75af3ca06cfbe4be7e",
@@ -419697,6 +419935,15 @@
     ]
    },
    "event-timing": {
+    "auxclick.html": [
+     "f0d8326b1307f9e30f444d725bdbdb614a1b2003",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "buffered-and-duration-threshold.html": [
      "cf5d63b02a1d3ccd8444f47f9fc3a56535594f45",
      [
@@ -460450,7 +460697,7 @@
       ]
      ],
      "consumption-crossorigin.sub.tentative.html": [
-      "01e4d35a43edca555e6ded7e8f35870299a76d44",
+      "31e3fb74e6ee354527f1cfc362bb70ca0bc53e4f",
       [
        null,
        {
@@ -460459,7 +460706,7 @@
       ]
      ],
      "consumption-sameorigin.tentative.html": [
-      "140642c97dd9dc0e7f2a267a93684b4e869b9c93",
+      "50f2feaa638c51a4bfcca961491038af8ee8b700",
       [
        null,
        {
@@ -460484,7 +460731,7 @@
       ]
      ],
      "navigation-state-reset-crossorigin.sub.tentative.html": [
-      "5839836a0d897d93e491c50f9d16c379161aa169",
+      "595a12ca70f9d0fd2fd4b9a53f876fa91d5a149e",
       [
        null,
        {
@@ -460493,7 +460740,7 @@
       ]
      ],
      "navigation-state-reset-sameorigin.tentative.html": [
-      "144d7d4bf50a6f97279be54fb7a2d03b74263abd",
+      "412b01fcb3b9235510b33c7e56c037fdd21b92c4",
       [
        null,
        {
@@ -460502,7 +460749,7 @@
       ]
      ],
      "propagation-crossorigin.sub.tentative.html": [
-      "a2f578f53b92a3595d3dbba15460d28f1d4f0960",
+      "775217ed17f9045047a876ee17afafd6895e4903",
       [
        null,
        {
@@ -460511,7 +460758,7 @@
       ]
      ],
      "propagation-sameorigin.tentative.html": [
-      "76d2b68fa708ac7a88c6a1bcabc0395f72070048",
+      "281e0ce6904776a9a8e32078e4940898689b08d6",
       [
        null,
        {
@@ -472771,7 +473018,7 @@
    },
    "periodic-background-sync": {
     "idlharness.https.any.js": [
-     "47c5e3fd04f7613e576f772e16fe73482c4fb9b3",
+     "6f3b6fdf87ac1eb4ba0f204ca6dc8c3d07a4d2ad",
      [
       "periodic-background-sync/idlharness.https.any.html",
       {
@@ -472783,8 +473030,13 @@
         [
          "script",
          "/resources/idlharness.js"
+        ],
+        [
+         "timeout",
+         "long"
         ]
-       ]
+       ],
+       "timeout": "long"
       }
      ],
      [
@@ -472798,8 +473050,13 @@
         [
          "script",
          "/resources/idlharness.js"
+        ],
+        [
+         "timeout",
+         "long"
         ]
-       ]
+       ],
+       "timeout": "long"
       }
      ]
     ],
@@ -488939,8 +489196,8 @@
       {}
      ]
     ],
-    "Slotable-interface.html": [
-     "a7b97e8026743028c3132534aeec25a431025190",
+    "Slottable-mixin.html": [
+     "84c7fce44501daf269e6a20c6dac8619d3b197f1",
      [
       null,
       {}
@@ -489304,7 +489561,7 @@
      ]
     ],
     "slotchange-event.html": [
-     "167d600a3bd0fa2af7b77f4ae750a3c76b954782",
+     "f1d06297ff623af2da99c5f2e0b7ebd6a7d1eb5f",
      [
       null,
       {}
@@ -489339,7 +489596,7 @@
      ]
     ],
     "slots-imperative-slot-api.tentative.html": [
-     "6343886da036d8ba09daf8d7d0fe2a8cd7949d48",
+     "02144640e12144cf5027aff74a5b22450e95149a",
      [
       null,
       {}
@@ -504099,6 +504356,67 @@
        {}
       ]
      ],
+     "prototypes.any.js": [
+      "714f4f8430e5eb35ff0ed9cd1d0c80662243eb1d",
+      [
+       null,
+       {
+        "jsshell": true,
+        "script_metadata": [
+         [
+          "global",
+          "window,dedicatedworker,jsshell"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/assertions.js"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/wasm-module-builder.js"
+         ]
+        ]
+       }
+      ],
+      [
+       "wasm/jsapi/prototypes.any.html",
+       {
+        "script_metadata": [
+         [
+          "global",
+          "window,dedicatedworker,jsshell"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/assertions.js"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/wasm-module-builder.js"
+         ]
+        ]
+       }
+      ],
+      [
+       "wasm/jsapi/prototypes.any.worker.html",
+       {
+        "script_metadata": [
+         [
+          "global",
+          "window,dedicatedworker,jsshell"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/assertions.js"
+         ],
+         [
+          "script",
+          "/wasm/jsapi/wasm-module-builder.js"
+         ]
+        ]
+       }
+      ]
+     ],
      "table": {
       "constructor.any.js": [
        "e9e77a132b76a479a2895c18c69b402be71fe3e7",
@@ -507631,6 +507949,13 @@
         {}
        ]
       ],
+      "k-rate-biquad-connection.html": [
+       "ab9df8740fab30d0395750590f9832b65f257a92",
+       [
+        null,
+        {}
+       ]
+      ],
       "k-rate-biquad.html": [
        "85ae4f175fe182a4bf993443163dea14f00fa203",
        [
@@ -510908,17 +511233,21 @@
     ],
     "simulcast": {
      "basic.https.html": [
-      "f097ebb7f38fa24bebcb6a39905a45dc7335ce43",
+      "5d5f3b52f5f668ca2ddd5218c5c9f60b884555df",
       [
        null,
-       {}
+       {
+        "timeout": "long"
+       }
       ]
      ],
      "getStats.https.html": [
-      "1161dfe2d47fd59e1e76c55d078bf7c1a9c1b96d",
+      "78289e68538adcb58ad0360a16ed0eb78b77e641",
       [
        null,
-       {}
+       {
+        "timeout": "long"
+       }
       ]
      ]
     }
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
new file mode 100644
index 00000000000..f64b45fea6b
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-002.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-002.html]
+  [Hit test float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
new file mode 100644
index 00000000000..4bfb0c2053a
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-004.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
new file mode 100644
index 00000000000..baa9f1a7541
--- /dev/null
+++ b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-005.html]
+  [Miss clipped float]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-flexbox/align-content_stretch.html.ini b/tests/wpt/metadata/css/css-flexbox/align-content_stretch.html.ini
deleted file mode 100644
index 144d0ff6fe1..00000000000
--- a/tests/wpt/metadata/css/css-flexbox/align-content_stretch.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[align-content_stretch.html]
-  expected: FAIL
diff --git a/tests/wpt/metadata/css/css-flexbox/gap-017.html.ini b/tests/wpt/metadata/css/css-flexbox/gap-017.html.ini
new file mode 100644
index 00000000000..ea76e5ee892
--- /dev/null
+++ b/tests/wpt/metadata/css/css-flexbox/gap-017.html.ini
@@ -0,0 +1,4 @@
+[gap-017.html]
+  [.button 1]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-flexbox/gap-018.html.ini b/tests/wpt/metadata/css/css-flexbox/gap-018.html.ini
new file mode 100644
index 00000000000..90aedd2e763
--- /dev/null
+++ b/tests/wpt/metadata/css/css-flexbox/gap-018.html.ini
@@ -0,0 +1,4 @@
+[gap-018.html]
+  [.button 1]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
index f8e7e539aae..4a1e8110f6f 100644
--- a/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
+++ b/tests/wpt/metadata/css/css-transforms/transform-scale-hittest.html.ini
@@ -2,6 +2,3 @@
   [Hit test intersecting scaled box]
     expected: FAIL
 
-  [Hit test within unscaled box]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
index 5733d536fd3..85e94926cb3 100644
--- a/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPosition.html.ini
@@ -21,6 +21,3 @@
   [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-invalid-cases.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
new file mode 100644
index 00000000000..e181af5397f
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-invalid-cases.html.ini
@@ -0,0 +1,4 @@
+[elementsFromPoint-invalid-cases.html]
+  [The root element is the last element returned for otherwise empty queries within the viewport]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index 062e0e25fa8..875aed168be 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -315,24 +315,18 @@
   [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html */*]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html */*]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
     expected: FAIL
 
-  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
-    expected: FAIL
-
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
+  [<iframe>: separate response Content-Type: text/plain */*]
+    expected: FAIL
+
+  [<iframe>: combined 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 258fe374697..a5b9b3752be 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,9 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
-  [separate text/javascript ]
+  [separate text/javascript;charset=windows-1252  text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_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/dom/idlharness.https.html.ini b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
index 1b67c7db500..07903105bdc 100644
--- a/tests/wpt/metadata/html/dom/idlharness.https.html.ini
+++ b/tests/wpt/metadata/html/dom/idlharness.https.html.ini
@@ -1385,6 +1385,9 @@
   [Navigator interface: calling registerProtocolHandler(DOMString, USVString) on window.navigator with too few arguments must throw TypeError]
     expected: FAIL
 
+  [ElementInternals interface: operation setValidity(optional ValidityStateFlags, optional DOMString, optional HTMLElement)]
+    expected: FAIL
+
 
 [idlharness.https.html?include=(Document|Window)]
   [Document interface: documentWithHandlers must inherit property "queryCommandEnabled(DOMString)" with the proper type]
diff --git a/tests/wpt/metadata/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini b/tests/wpt/metadata/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini
new file mode 100644
index 00000000000..e23d11f1829
--- /dev/null
+++ b/tests/wpt/metadata/html/rendering/non-replaced-elements/tables/table-row-group-height.html.ini
@@ -0,0 +1,2 @@
+[table-row-group-height.html]
+  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 4df5d7a35de..daa518bd0e3 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
@@ -1,4 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index cb0211f1d21..5f60c78e73c 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,6 +1,6 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
 
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/iframe_005.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
new file mode 100644
index 00000000000..6cf9d13975c
--- /dev/null
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/iframe_005.html.ini
@@ -0,0 +1,4 @@
+[iframe_005.html]
+  [document.write external script into iframe write back into parent]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/jsapi/idlharness.any.js.ini b/tests/wpt/metadata/wasm/jsapi/idlharness.any.js.ini
index ab8505916ed..afe6a5ae997 100644
--- a/tests/wpt/metadata/wasm/jsapi/idlharness.any.js.ini
+++ b/tests/wpt/metadata/wasm/jsapi/idlharness.any.js.ini
@@ -8,6 +8,9 @@
   [Module interface: mod must inherit property "customSections(Module, USVString)" with the proper type]
     expected: FAIL
 
+  [wasm-js-api interfaces.]
+    expected: FAIL
+
 
 [idlharness.any.html]
   [Module interface: calling customSections(Module, USVString) on mod with too few arguments must throw TypeError]
@@ -19,3 +22,6 @@
   [Module interface: mod must inherit property "customSections(Module, USVString)" with the proper type]
     expected: FAIL
 
+  [wasm-js-api interfaces.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/wasm/jsapi/prototypes.any.js.ini b/tests/wpt/metadata/wasm/jsapi/prototypes.any.js.ini
new file mode 100644
index 00000000000..71837c4e8f5
--- /dev/null
+++ b/tests/wpt/metadata/wasm/jsapi/prototypes.any.js.ini
@@ -0,0 +1,33 @@
+[prototypes.any.html]
+  [_Module]
+    expected: FAIL
+
+  [_Instance]
+    expected: FAIL
+
+  [_Global]
+    expected: FAIL
+
+  [_Table]
+    expected: FAIL
+
+  [_Memory]
+    expected: FAIL
+
+
+[prototypes.any.worker.html]
+  [_Module]
+    expected: FAIL
+
+  [_Instance]
+    expected: FAIL
+
+  [_Global]
+    expected: FAIL
+
+  [_Table]
+    expected: FAIL
+
+  [_Memory]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini
new file mode 100644
index 00000000000..b145905f63e
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html.ini
@@ -0,0 +1,40 @@
+[k-rate-biquad-connection.html]
+  [< [Gain AudioParam\] 1 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [< [Detune AudioParam\] 2 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [X All k-rate AudioParams does not equal [0,0.3311063051223755,0.6248595118522644,0.8481203317642212,0.9757021069526672,0.9932119250297546,0.8986744284629822,0.7027547359466553,0.42755505442619324,0.1041216030716896,-0.23105813562870026,-0.5401715040206909,-0.7883464694023132,-0.9475855827331543,-0.9999247193336487,-0.9394592046737671...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[640\]\t8.2034111022949219e-1\t7.7920007705688477e-1\t4.1141033172607422e-2\t5.2799061991884222e-2\t0.0000000000000000e+0\n\t[641\]\t5.5707097053527832e-1\t4.6239438652992249e-1\t9.4676584005355835e-2\t2.0475288360627431e-1\t0.0000000000000000e+0\n\t[642\]\t2.5545451045036316e-1\t1.8853309750556946e-1\t6.6921412944793701e-2\t3.5495843345392858e-1\t0.0000000000000000e+0\n\t[643\]\t-6.9336682558059692e-2\t-1.7021611332893372e-1\t1.0087943077087402e-1\t5.9265500073973498e-1\t0.0000000000000000e+0\n\t[644\]\t-3.9448010921478271e-1\t-4.7897621989250183e-1\t8.4496110677719116e-2\t1.7640982405490371e-1\t0.0000000000000000e+0\n\t...and 991 more errors.\n\tMax AbsError of 1.6447335481643677e-1 at index of 785.\n\t[785\]\t3.4482055902481079e-1\t5.0929391384124756e-1\t1.6447335481643677e-1\t3.2294388435928745e-1\t0.0000000000000000e+0\n\tMax RelError of 2.2756960801624473e+1 at index of 867.\n\t[867\]\t1.4153416454792023e-1\t5.9575871564447880e-3\t1.3557657739147544e-1\t2.2756960801624473e+1\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [X k-rate Q with input: output[2048:\] does not equal [-0.007429864257574081,-0.003294537542387843,0.0019048331305384636,0.003956870641559362,0.0035721869207918644,0.004832542035728693,0.008425349369645119,0.010273684747517109,0.007734519429504871,0.003703415160998702,0.0022171076852828264,0.0024073002859950066,0.0002190780360251665,-0.004831020720303059,-0.00846010260283947,-0.007902969606220722...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t1.3721437426283956e-3\t-7.4298642575740814e-3\t8.8020080002024770e-3\t1.1846795170220799e+0\t0.0000000000000000e+0\n\t[1\]\t2.7593520935624838e-3\t-3.2945375423878431e-3\t6.0538896359503269e-3\t1.8375536954915186e+0\t0.0000000000000000e+0\n\t[2\]\t4.5378590002655983e-3\t1.9048331305384636e-3\t2.6330258697271347e-3\t1.3822868930166201e+0\t0.0000000000000000e+0\n\t[3\]\t2.8837921563535929e-3\t3.9568706415593624e-3\t1.0730784852057695e-3\t2.7119372413521214e-1\t0.0000000000000000e+0\n\t[4\]\t-1.0738879209384322e-3\t3.5721869207918644e-3\t4.6460748417302966e-3\t1.3006247838510026e+0\t0.0000000000000000e+0\n\t...and 2043 more errors.\n\tMax AbsError of 1.0892769030760974e-2 at index of 7.\n\t[7\]\t-6.1908428324386477e-4\t1.0273684747517109e-2\t1.0892769030760974e-2\t1.0602592252398519e+0\t0.0000000000000000e+0\n\tMax RelError of 2.0715534970620170e+3 at index of 217.\n\t[217\]\t4.6172837028279901e-4\t-2.2299755642052332e-7\t4.6195136783921953e-4\t2.0715534970620170e+3\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [Frequency AudioParam\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate gain with input: output[0,2048\] does not equal [0,0.9757021069526672,0.42755505442619324,-0.7883464694023132,-0.7730104327201843,0.4496113359928131,0.9700312614440918,-0.02454114705324173,-0.9807852506637573,-0.40524137020111084,0.803207516670227,0.7572088241577148,-0.4713967740535736,-0.9637761116027832,0.049067676067352295,0.9852776527404785...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t3.2094421330839396e-3\t-8.7422776573475858e-8\t3.2095295558605130e-3\t3.6712738735345622e+4\t0.0000000000000000e+0\n\t[129\]\t-9.5966094732284546e-1\t-9.7570210695266724e-1\t1.6041159629821777e-2\t1.6440632356449301e-2\t0.0000000000000000e+0\n\t[130\]\t-4.2053195834159851e-1\t-4.2755520343780518e-1\t7.0232450962066650e-3\t1.6426522329129622e-2\t0.0000000000000000e+0\n\t[131\]\t7.6242697238922119e-1\t7.8834640979766846e-1\t2.5919437408447266e-2\t3.2878233586551842e-2\t0.0000000000000000e+0\n\t[132\]\t7.4586772918701172e-1\t7.7301049232482910e-1\t2.7142763137817383e-2\t3.5113059146436060e-2\t0.0000000000000000e+0\n\t...and 921 more errors.\n\tMax AbsError of 5.3484499454498291e-1 at index of 255.\n\t[255\]\t-4.4085711240768433e-1\t-9.7570210695266724e-1\t5.3484499454498291e-1\t5.4816423038730722e-1\t0.0000000000000000e+0\n\tMax RelError of 3.6712738735345622e+4 at index of 128.\n]
+    expected: FAIL
+
+  [X k-rate frequency with input: output[0,2048\] does not equal [0,0.02839340642094612,0.1450495570898056,0.36942505836486816,0.6520541310310364,0.9131435751914978,1.0783559083938599,1.1012734174728394,0.9707123637199402,0.7065789699554443,0.3498469293117523,-0.048511650413274765,-0.4367612302303314,-0.7688571810722351,-1.0084279775619507,-1.131049394607544...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t-1.1191306114196777e+0\t-1.0972596406936646e+0\t2.1870970726013184e-2\t1.9932356859664331e-2\t0.0000000000000000e+0\n\t[129\]\t-9.9151837825775146e-1\t-9.3471795320510864e-1\t5.6800425052642822e-2\t6.0767448467076671e-2\t0.0000000000000000e+0\n\t[130\]\t-7.5953400135040283e-1\t-6.6672790050506592e-1\t9.2806100845336914e-2\t1.3919636597633545e-1\t0.0000000000000000e+0\n\t[131\]\t-4.4247153401374817e-1\t-3.2352218031883240e-1\t1.1894935369491577e-1\t3.6766985675507846e-1\t0.0000000000000000e+0\n\t[132\]\t-7.1794092655181885e-2\t5.6181102991104126e-2\t1.2797519564628601e-1\t2.2779046482328758e+0\t0.0000000000000000e+0\n\t...and 891 more errors.\n\tMax AbsError of 4.1948493570089340e-1 at index of 649.\n\t[649\]\t-3.7298277020454407e-3\t-4.2321476340293884e-1\t4.1948493570089340e-1\t9.9118691495529354e-1\t0.0000000000000000e+0\n\tMax RelError of 1.1267462635054815e+2 at index of 553.\n\t[553\]\t3.3036437630653381e-1\t2.9062279500067234e-3\t3.2745814835652709e-1\t1.1267462635054815e+2\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [Q AudioParam\] 2 out of 9 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate detune with input: output[2048:\] does not equal [-0.5481402277946472,-0.548226535320282,-0.548312246799469,-0.5483972430229187,-0.5484814047813416,-0.5485645532608032,-0.5486468076705933,-0.5487281680107117,-0.5488086938858032,-0.5488886833190918,-0.5489681363105774,-0.5490474104881287,-0.5491266250610352,-0.5492058992385864,-0.5492852926254272,-0.5493649244308472...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[0\]\t3.0814451747573912e-4\t-5.4814022779464722e-1\t5.4844837231212296e-1\t1.0005621636615059e+0\t0.0000000000000000e+0\n\t[1\]\t2.8959027258679271e-4\t-5.4822653532028198e-1\t5.4851612559286878e-1\t1.0005282310394144e+0\t0.0000000000000000e+0\n\t[2\]\t2.7123777545057237e-4\t-5.4831224679946899e-1\t5.4858348457491957e-1\t1.0004946775802179e+0\t0.0000000000000000e+0\n\t[3\]\t2.5325475144200027e-4\t-5.4839724302291870e-1\t5.4865049777436070e-1\t1.0004618089435424e+0\t0.0000000000000000e+0\n\t[4\]\t2.3576857347507030e-4\t-5.4848140478134155e-1\t5.4871717335481662e-1\t1.0004298570041203e+0\t0.0000000000000000e+0\n\t...and 2043 more errors.\n\tMax AbsError of 5.5494355945847929e-1 at index of 195.\n\t[195\]\t-2.7666112873703241e-3\t-5.5771017074584961e-1\t5.5494355945847929e-1\t9.9503933865206295e-1\t0.0000000000000000e+0\n\tMax RelError of 1.0005621636615059e+0 at index of 0.\n]
+    expected: FAIL
+
+  [< [All k-rate inputs\] 1 out of 44 assertions were failed.]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 5 out of 5 tasks were failed.]
+    expected: FAIL
+
+  [X k-rate Q with input: output[0,2048\] does not equal [0,0.9757021069526672,0.42755505442619324,-0.7883464694023132,-0.7730104327201843,0.4496113359928131,0.9700312614440918,-0.02454114705324173,-0.9807852506637573,-0.40524137020111084,0.803207516670227,0.7572088241577148,-0.4713967740535736,-0.9637761116027832,0.049067676067352295,0.9852776527404785...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t1.3951719999313354e+0\t-8.7422776573475858e-8\t1.3951720873541120e+0\t1.5958908445118047e+7\t0.0000000000000000e+0\n\t[129\]\t1.6225984096527100e+0\t-9.7570210695266724e-1\t2.5983005166053772e+0\t2.6630059503719248e+0\t0.0000000000000000e+0\n\t[130\]\t1.6577711105346680e+0\t-4.2755520343780518e-1\t2.0853263139724731e+0\t4.8773264766869282e+0\t0.0000000000000000e+0\n\t[131\]\t1.5306757688522339e+0\t7.8834640979766846e-1\t7.4232935905456543e-1\t9.4162838801420634e-1\t0.0000000000000000e+0\n\t[132\]\t1.2523171901702881e+0\t7.7301049232482910e-1\t4.7930669784545898e-1\t6.2005199490105767e-1\t0.0000000000000000e+0\n\t...and 1915 more errors.\n\tMax AbsError of 2.5983005166053772e+0 at index of 129.\n\tMax RelError of 1.5958908445118047e+7 at index of 128.\n]
+    expected: FAIL
+
+  [X k-rate detune with input: output[0,2048\] does not equal [0,0.12810896337032318,0.47732436656951904,0.8133140802383423,0.9599840044975281,0.9983929991722107,0.9618627429008484,0.8107287883758545,0.5545527338981628,0.24036024510860443,-0.09643325209617615,-0.424831748008728,-0.7066475749015808,-0.9075677990913391,-1.0057729482650757,-0.9910215139389038...\] with an element-wise tolerance of {"absoluteThreshold":0,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[128\]\t-9.0901952981948853e-1\t-8.0834698677062988e-1\t1.0067254304885864e-1\t1.2454124861781007e-1\t0.0000000000000000e+0\n\t[129\]\t-8.0550211668014526e-1\t-5.6012439727783203e-1\t2.4537771940231323e-1\t4.3807718534460011e-1\t0.0000000000000000e+0\n\t[130\]\t-6.2269222736358643e-1\t-2.4871249496936798e-1\t3.7397973239421844e-1\t1.5036628233747511e+0\t0.0000000000000000e+0\n\t[131\]\t-3.5228535532951355e-1\t9.0757519006729126e-2\t4.4304287433624268e-1\t4.8816106828944248e+0\t0.0000000000000000e+0\n\t[132\]\t-1.3693822547793388e-2\t4.1998896002769470e-1\t4.3368278257548809e-1\t1.0326051964482361e+0\t0.0000000000000000e+0\n\t...and 1915 more errors.\n\tMax AbsError of 2.1426951885223389e+0 at index of 391.\n\t[391\]\t6.9794428348541260e-1\t-1.4447509050369263e+0\t2.1426951885223389e+0\t1.4830897015202589e+0\t0.0000000000000000e+0\n\tMax RelError of 2.4604596714524988e+2 at index of 272.\n\t[272\]\t9.5641678571701050e-1\t-3.9030096959322691e-3\t9.6031979541294277e-1\t2.4604596714524988e+2\t0.0000000000000000e+0\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini b/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
index daa7a8c41bc..10dda3a6659 100644
--- a/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
+++ b/tests/wpt/metadata/workers/shared-worker-in-data-url-context.window.js.ini
@@ -1,8 +1,7 @@
 [shared-worker-in-data-url-context.window.html]
-  expected: TIMEOUT
   [Create a shared worker in a data url frame]
     expected: FAIL
 
   [Create a data url shared worker in a data url frame]
-    expected: TIMEOUT
+    expected: FAIL
 
diff --git a/tests/wpt/web-platform-tests/README.md b/tests/wpt/web-platform-tests/README.md
index b3782c2c339..1babc2f1e6f 100644
--- a/tests/wpt/web-platform-tests/README.md
+++ b/tests/wpt/web-platform-tests/README.md
@@ -1,7 +1,7 @@
 The web-platform-tests Project
 ==============================
 
-[![Taskcluster CI Status](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/badge.svg)](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/latest)
+[![Taskcluster CI Status](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/badge.svg)](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/latest) [![documentation](https://github.com/web-platform-tests/wpt/workflows/documentation/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Adocumentation+branch%3Amaster) [![manifest](https://github.com/web-platform-tests/wpt/workflows/manifest/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Amanifest+branch%3Amaster) [![Python 3](https://pyup.io/repos/github/web-platform-tests/wpt/python-3-shield.svg)](https://pyup.io/repos/github/web-platform-tests/wpt/)
 
 The web-platform-tests Project is a cross-browser test suite for the
 Web-platform stack. Writing tests in a way that allows them to be run in all
diff --git a/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html b/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html
index 1bbf5aa6de6..453b6fc5fe6 100644
--- a/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html
+++ b/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html
@@ -27,6 +27,7 @@ promise_test(async (test) => {
     "sec-ch-ua",
     "sec-ch-ua-arch",
     "sec-ch-ua-platform",
+    "sec-ch-ua-platform-version",
     "sec-ch-ua-model",
     "sec-ch-ua-mobile",
   ];
diff --git a/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html.headers b/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html.headers
index 05b7a4a6f6f..d54a29a3f91 100644
--- a/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html.headers
+++ b/tests/wpt/web-platform-tests/client-hints/accept-ch-cache-revalidation.https.html.headers
@@ -1 +1 @@
-Accept-CH: dpr,device-memory,viewport-width,rtt,downlink,ect,lang,ua,arch,platform,model
\ No newline at end of file
+Accept-CH: dpr,device-memory,viewport-width,rtt,downlink,ect,lang,ua,ua-arch,ua-platform,ua-platform-version,ua-model
diff --git a/tests/wpt/web-platform-tests/client-hints/resources/echo-ua-client-hints-received.py b/tests/wpt/web-platform-tests/client-hints/resources/echo-ua-client-hints-received.py
index 4af98c75cce..57cf50457d3 100644
--- a/tests/wpt/web-platform-tests/client-hints/resources/echo-ua-client-hints-received.py
+++ b/tests/wpt/web-platform-tests/client-hints/resources/echo-ua-client-hints-received.py
@@ -12,6 +12,7 @@ def main(request, response):
         "sec-ch-ua",
         "sec-ch-ua-arch",
         "sec-ch-ua-platform",
+        "sec-ch-ua-platform-version",
         "sec-ch-ua-model",
         "sec-ch-ua-full-version",
     ]
diff --git a/tests/wpt/web-platform-tests/client-hints/resources/stale-echo-client-hints.py b/tests/wpt/web-platform-tests/client-hints/resources/stale-echo-client-hints.py
index 769fa909fa4..0d0d4a44a98 100644
--- a/tests/wpt/web-platform-tests/client-hints/resources/stale-echo-client-hints.py
+++ b/tests/wpt/web-platform-tests/client-hints/resources/stale-echo-client-hints.py
@@ -18,6 +18,7 @@ def main(request, response):
       "sec-ch-ua",
       "sec-ch-ua-arch",
       "sec-ch-ua-platform",
+      "sec-ch-ua-platform-version",
       "sec-ch-ua-model",
     ]
 
@@ -57,4 +58,4 @@ def main(request, response):
                  ("Cache-Control", "private, max-age=0, stale-while-revalidate=60"),
                  ("Unique-Id", unique_id)]
       content = "report('{}')".format(unique_id)
-      return 200, headers, content
\ No newline at end of file
+      return 200, headers, content
diff --git a/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html b/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html
index 81fe09fb049..d60bf4c9b67 100644
--- a/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html
+++ b/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html
@@ -22,6 +22,7 @@ promise_test(async (test) => {
   const string_client_hint_headers = [
     "sec-ch-ua-arch",
     "sec-ch-ua-platform",
+    "sec-ch-ua-platform-version",
     "sec-ch-ua-model",
     "sec-ch-ua-full-version",
   ];
diff --git a/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html.headers b/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html.headers
index 703b5ad9bf9..1e99ac7203b 100644
--- a/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html.headers
+++ b/tests/wpt/web-platform-tests/client-hints/sec-ch-quotes.https.html.headers
@@ -1 +1 @@
-Accept-CH: ua,arch,platform,model
\ No newline at end of file
+Accept-CH: ua,ua-arch,ua-platform,ua-platform-version,ua-model
diff --git a/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html b/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html
new file mode 100644
index 00000000000..f4196f0c564
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html
@@ -0,0 +1,107 @@
+<!DOCTYPE html>
+<head>
+  <title>Check for post-redirect leak from StackTrace.</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/common/get-host-info.sub.js"></script>
+  <script src="/common/utils.js"></script>
+</head>
+<body>
+<script>
+
+const CROSS_ORIGIN = get_host_info().HTTPS_REMOTE_ORIGIN;
+const CROSS_SITE = get_host_info().HTTPS_NOTSAMESITE_ORIGIN;
+
+const blank_path = "/common/blank.html"
+const redirect = url =>
+  blank_path + `?token=${token()}&pipe=status(302)|header(Location,${url})`;
+
+const script_path = "/content-security-policy/reporting/support/throw-function.js"
+const script_ref = "#ref"
+const script_attribute = "?secret=1234";
+
+promise_setup(async () => {
+  await new Promise(r => window.addEventListener("DOMContentLoaded", r));
+});
+
+let loadScript = origin => {
+  let script = document.createElement("script");
+  script.src = origin +
+    redirect(origin + script_path + script_attribute + script_ref);
+  let script_loaded = new Promise(r => script.onload = r);
+  document.head.appendChild(script);
+  return script_loaded;
+}
+
+// Note: .stack properties on errors are unspecified, but are present in most
+// browsers, most of the time. https://github.com/tc39/proposal-error-stacks
+// tracks standardizing them. Tests will pass automatically if the .stack
+// property isn't present.
+let getStack = async (origin) => {
+  await loadScript(origin);
+  try {
+    throw_function();
+  } catch (error) {
+    if (error.stack)
+      return error.stack.toString();
+  }
+  return "";
+};
+
+promise_test(async test => {
+  let data = await getStack(CROSS_ORIGIN);
+  assert_false(data.includes(script_ref), "Ref not leaked");
+  assert_false(data.includes(script_attribute), "Attribute not leaked");
+  assert_false(data.includes(script_path), "Path not leaked");
+}, "StackTrace do not leak cross-origin post-redirect URL");
+
+promise_test(async test => {
+  let data = await getStack(CROSS_SITE);
+  assert_false(data.includes(script_ref), "Ref not leaked");
+  assert_false(data.includes(script_attribute), "Attribute not leaked");
+  assert_false(data.includes(script_path), "Path not leaked");
+}, "StackTrace do not leak cross-site post-redirect URL");
+
+let getCspReport = async (origin) => {
+  // A promise to a future CSP violation.
+  let violation = new Promise(resolve => {
+    const observer = new ReportingObserver(reports => {
+      observer.disconnect();
+      resolve(JSON.stringify(reports));
+    });
+    observer.observe();
+  });
+
+  // This will be blocked by CSP:
+  let script = document.createElement("script");
+  script.src = origin +
+    redirect(origin + script_path + script_attribute + script_ref);
+  script.onload = () => { load_image(); };
+  document.head.appendChild(script);
+
+  return await violation;
+};
+
+// This block is needed to reproduce https://crbug.com/1074316. Without, the
+// next test passes. There is no 'source-file' found in report.
+// TODO(arthursonzogni): Investigate more. Find why this has side effects.
+promise_setup(async test => {
+  await getCspReport(CROSS_ORIGIN);
+}, "prewarm the cache");
+
+promise_test(async test => {
+  let data = await getCspReport(CROSS_ORIGIN);
+  assert_false(data.includes(script_ref), "Ref not leaked");
+  assert_false(data.includes(script_attribute), "Attribute not leaked");
+  assert_false(data.includes(script_path), "Path not leaked");
+}, "CSP report do not leak cross-origin post-redirect URL");
+
+promise_test(async test => {
+  let data = await getCspReport(CROSS_SITE);
+  assert_false(data.includes(script_ref), "Ref not leaked");
+  assert_false(data.includes(script_attribute), "Attribute not leaked");
+  assert_false(data.includes(script_path), "Path not leaked");
+}, "CSP report do not leak cross-site post-redirect URL");
+
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html.headers b/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html.headers
new file mode 100644
index 00000000000..644ed867f33
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/reporting/post-redirect-stacktrace.https.html.headers
@@ -0,0 +1 @@
+Content-Security-Policy-Report-Only: img-src 'none'; report-uri /endpoint
diff --git a/tests/wpt/web-platform-tests/content-security-policy/reporting/support/throw-function.js b/tests/wpt/web-platform-tests/content-security-policy/reporting/support/throw-function.js
new file mode 100644
index 00000000000..d0e9d203dd5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/reporting/support/throw-function.js
@@ -0,0 +1,9 @@
+function throw_function() {
+  throw new Error("an error");
+}
+
+function load_image() {
+  let img = document.createElement('img');
+  document.body.append(img);
+  img.src = "/xhr/resources/img.jpg"
+}
diff --git a/tests/wpt/web-platform-tests/cookie-store/cookieStore_delete_arguments.tentative.https.any.js b/tests/wpt/web-platform-tests/cookie-store/cookieStore_delete_arguments.tentative.https.any.js
index e2fca75850d..f1763ad7cbe 100644
--- a/tests/wpt/web-platform-tests/cookie-store/cookieStore_delete_arguments.tentative.https.any.js
+++ b/tests/wpt/web-platform-tests/cookie-store/cookieStore_delete_arguments.tentative.https.any.js
@@ -33,6 +33,19 @@ promise_test(async testCase => {
   assert_equals(cookie, null);
 }, 'cookieStore.delete with name in both positional arguments and options');
 
+promise_test(async testCase => {
+  const currentUrl = new URL(self.location.href);
+  const currentDomain = currentUrl.hostname;
+
+  await promise_rejects_js(testCase, TypeError, cookieStore.set(
+      'cookie-name', 'cookie-value', { domain: `.${currentDomain}` }));
+}, 'cookieStore.delete domain starts with "."');
+
+promise_test(async testCase => {
+  await promise_rejects_js(testCase, TypeError, cookieStore.set(
+      'cookie-name', 'cookie-value', { domain: 'example.com' }));
+}, 'cookieStore.delete with domain that is not equal current host');
+
 promise_test(async testCase => {
   const currentUrl = new URL(self.location.href);
   const currentDomain = currentUrl.hostname;
diff --git a/tests/wpt/web-platform-tests/css/css-animations/webkit-writing-mode-crash.html b/tests/wpt/web-platform-tests/css/css-animations/webkit-writing-mode-crash.html
new file mode 100644
index 00000000000..8c851a7572e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-animations/webkit-writing-mode-crash.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html class="test-wait">
+<link rel="help" href="https://crbug.com/1077501">
+<style>
+  @keyframes test {
+    from { -webkit-writing-mode: var(--x) }
+    to { -webkit-writing-mode: var(--y) }
+  }
+  div {
+    animation: test 1s;
+  }
+</style>
+<div id=div></div>
+<script>
+window.onload = () => {
+  div.offsetTop;
+  document.documentElement.classList.remove('test-wait');
+};
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/align-content_stretch.html b/tests/wpt/web-platform-tests/css/css-flexbox/align-content_stretch.html
index 674196f7404..3acc57a2f32 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/align-content_stretch.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/align-content_stretch.html
@@ -4,17 +4,17 @@
     <title>CSS Flexible Box Test: align-content_stretch</title>
     <link rel="author" title="Intel" href="http://www.intel.com" />
     <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#align-content-property" />
-    <link rel="match" href="reference/align-content_space-stretch-ref.html">
+    <link rel="match" href="reference/align-content_stretch-ref.html">
     <link rel="stylesheet" href="support/test-style.css">
     <meta name="flags" content="" />
     <meta name="assert" content="Check if the web engine can identify the align-content value stretch." />
     <style>
       #test{
-	height: 200px;
+        height: 210px;
         width: 80px;
         display: flex;
-	flex-wrap: wrap;
-	align-content: stretch;
+        flex-wrap: wrap;
+        align-content: stretch;
       }
     </style>
   </head>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-017.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-017.html
new file mode 100644
index 00000000000..446d16dfa64
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-017.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>Flex gaps</title>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#main-alignment">
+<link rel="help" href="https://drafts.csswg.org/css-align/#gaps">
+<meta name="assert" content="Button elements with display: flex honor gaps." />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<style>
+.button {
+  display: flex;
+  flex-direction: column;
+  border: 0;
+  padding: 0;
+  background: green;
+  width: 100px;
+  row-gap: 20px;
+}
+
+.item {
+  height: 40px;
+}
+
+#reference-overlapped-red {
+  position: absolute;
+  background-color: red;
+  width: 100px;
+  height: 100px;
+  z-index: -1;
+}
+</style>
+
+<div id=reference-overlapped-red></div>
+
+<button class=button data-expected-height=100>
+  <div class=item></div>
+  <div class=item></div>
+</button>
+
+<script>
+checkLayout('.button');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/gap-018.html b/tests/wpt/web-platform-tests/css/css-flexbox/gap-018.html
new file mode 100644
index 00000000000..4065f4ece8e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/gap-018.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<title>Flex gaps</title>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#main-alignment">
+<link rel="help" href="https://drafts.csswg.org/css-align/#gaps">
+<meta name="assert" content="Button elements with display: flex but no items don't subtract column gap from intrinsic max size." />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<style>
+.button {
+  display: flex;
+  border: 0;
+  padding: 0;
+
+  padding-left: 100px;
+  column-gap: 100px;
+  width: max-width;
+  height: 100px;
+  background: green;
+}
+
+#reference-overlapped-red {
+  position: absolute;
+  background-color: red;
+  width: 100px;
+  height: 100px;
+  z-index: -1;
+}
+</style>
+
+<div id=reference-overlapped-red></div>
+
+<button class=button data-expected-width=100></button>
+
+<script>
+checkLayout('.button');
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_space-stretch-ref.html b/tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_stretch-ref.html
similarity index 93%
rename from tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_space-stretch-ref.html
rename to tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_stretch-ref.html
index ca611a2ee70..f66a1ad9595 100644
--- a/tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_space-stretch-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/reference/align-content_stretch-ref.html
@@ -5,16 +5,16 @@
 <link rel="stylesheet" href="../support/test-style.css">
 <style>
 #test {
-  height: 200px;
+  height: 210px;
   width: 80px;
 }
 #spacerone {
   width: 50px;
-  height: 17px;
+  height: 20px;
 }
 #spacertwo {
   width: 50px;
-  height: 16px;
+  height: 20px;
 }
 </style>
 </head>
diff --git a/tests/wpt/web-platform-tests/css/css-pseudo/marker-reverted-styles.html b/tests/wpt/web-platform-tests/css/css-pseudo/marker-reverted-styles.html
new file mode 100644
index 00000000000..4e8b1228c50
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-pseudo/marker-reverted-styles.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Pseudo-Elements Test: Reverted styles for ::marker</title>
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#marker-pseudo">
+<link rel="help" href="https://drafts.csswg.org/css-cascade-4/#default">
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<meta name="assert" content="This test checks that ::marker styles can be reverted to UA origin." />
+<style>
+.revert::marker { all: revert }
+.outside { list-style-position: outside }
+.inside { list-style-position: inside }
+.symbol { list-style-type: symbol }
+.decimal { list-style-type: decimal }
+.string { list-style-type: "string" }
+.marker::marker { content: "marker" }
+</style>
+<div id="log"></div>
+<ul>
+  <li class="outside symbol">outside symbol</li>
+  <li class="outside decimal">outside decimal</li>
+  <li class="outside string">outside string</li>
+  <li class="outside marker">outside marker</li>
+  <li class="inside symbol">inside symbol</li>
+  <li class="inside decimal">inside decimal</li>
+  <li class="inside string">inside string</li>
+  <li class="inside marker">inside marker</li>
+</ul>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<script>
+function getStyles(style) {
+  const obj = {};
+  for (let i = 0; i < style.length; ++i) {
+    const prop = style.item(i);
+    obj[prop] = style.getPropertyValue(prop);
+  }
+  return obj;
+}
+for (const target of document.querySelectorAll("li")) {
+  test(function() {
+    const cs = getComputedStyle(target, "::marker");
+    const defaultStyles = getStyles(cs);
+    target.classList.add("revert");
+    const revertedStyles = getStyles(cs);
+    assert_object_equals(revertedStyles, defaultStyles);
+  }, `Reverted computed values for ${target.className}`);
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/auto-margins-001.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/auto-margins-001.tentative.html
new file mode 100644
index 00000000000..9e89ab6ca7f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/auto-margins-001.tentative.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div inline size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="width: 200px; margin-left: -50px;">
+  <div style="height: 100px; aspect-ratio: 1/1; margin: auto; background: green;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-001.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-001.tentative.html
new file mode 100644
index 00000000000..456e0b348a2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-001.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div block size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; width: 100px; aspect-ratio: 1/1;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-002.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-002.tentative.html
new file mode 100644
index 00000000000..2dc374c9f2d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-002.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div inline size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; height: 100px; aspect-ratio: 1/1;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-003.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-003.tentative.html
new file mode 100644
index 00000000000..987629d2e83
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-003.tentative.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div block size in vertical writing mode</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; writing-mode: vertical-lr; width: 100px; aspect-ratio: 2/1;"></div>
+<div style="background: green; width: 100px; height: 50px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-004.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-004.tentative.html
new file mode 100644
index 00000000000..99e92d40939
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-004.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div block size with box-sizing</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; width: 100px; aspect-ratio: 1/1; box-sizing: border-box; padding-left: 50px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-005.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-005.tentative.html
new file mode 100644
index 00000000000..dcee7cd10c5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-005.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div block size with box-sizing</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; width: 50px; aspect-ratio: 1/2; padding-left: 50px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-006.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-006.tentative.html
new file mode 100644
index 00000000000..0cde4d4dd95
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-006.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div inline size with box-sizing</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; height: 100px; aspect-ratio: 1/1; box-sizing: border-box; padding-top: 50px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-007.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-007.tentative.html
new file mode 100644
index 00000000000..bc79a8f6ef3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-007.tentative.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div inline size with box-sizing</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: green; height: 50px; aspect-ratio: 2/1; padding-top: 50px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-008.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-008.tentative.html
new file mode 100644
index 00000000000..8575d96c769
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-008.tentative.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: div block size</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="Aspect ratio should only be used if a width was specified.">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="background: red; aspect-ratio: 1/1;"></div>
+<div style="background: green; width: 100px; height: 100px;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/flex-aspect-ratio-007.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/flex-aspect-ratio-007.tentative.html
new file mode 100644
index 00000000000..c7144c3cf67
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/flex-aspect-ratio-007.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: Wrapping column flexbox line length</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#line-sizing" title="9.2.3.B">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="display: flex; flex-direction: column; flex-wrap: wrap; width: 100px; aspect-ratio: 1/1;">
+  <div style="background: green; width: 50px; height: 100px;"></div>
+  <div style="background: green; width: 50px; height: 100px;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-001.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-001.tentative.html
new file mode 100644
index 00000000000..a1222208aba
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-001.tentative.html
@@ -0,0 +1,15 @@
+<!-- quirks mode -->
+<title>Aspect ratio and quirks mode</title>
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<meta name="flags" content="dom" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+onload = function() {
+  test(function() {
+    assert_equals(document.body.offsetHeight, 100);
+  }, "body height is 100");
+};
+</script>
+<body style="width: 100px; aspect-ratio: 1/1;">
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-002.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-002.tentative.html
new file mode 100644
index 00000000000..7c8bcac07ad
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/quirks-mode-002.tentative.html
@@ -0,0 +1,15 @@
+<!-- quirks mode -->
+<title>Aspect ratio and quirks mode</title>
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<meta name="flags" content="dom" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+onload = function() {
+  test(function() {
+    assert_not_equals(document.body.offsetHeight, document.body.offsetWidth);
+  }, "body height is different from width");
+};
+</script>
+<body style="aspect-ratio: 1/1;">
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-009.html b/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-009.html
new file mode 100644
index 00000000000..0c7a411a728
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-009.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#intrinsic">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="This test checks that a dynamic change in the height of an element calculates the intrinsic min/max size correctly when a replaced element is present."/>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="float: left; background: green; line-height: 0;">
+  <span style="display: inline-block; height: 100%;">
+    <canvas width="1" height="1" style="height: 100%;"></canvas>
+  </div>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-010.html b/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-010.html
new file mode 100644
index 00000000000..04c154e8fcd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/intrinsic-percent-replaced-dynamic-010.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#intrinsic">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="This test checks that a dynamic change in the height of an element calculates the intrinsic min/max size correctly when a replaced element is present."/>
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="float: left; background: green; color: transparent;">
+  <span>
+    <div style="float: left; height: 100%;">
+      <canvas width="1" height="1" style="height: 100%;"></canvas>
+    </div>
+  </span>
+</div>
+<script>
+  document.body.offsetTop;
+  document.getElementById('target').style.height = '100px';
+</script>
diff --git a/tests/wpt/web-platform-tests/event-timing/auxclick.html b/tests/wpt/web-platform-tests/event-timing/auxclick.html
new file mode 100644
index 00000000000..f0d8326b130
--- /dev/null
+++ b/tests/wpt/web-platform-tests/event-timing/auxclick.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<meta charset=utf-8 />
+<title>Event Timing auxclick.</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-actions.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src=resources/event-timing-test-utils.js></script>
+<div id='target'>Click me</div>
+<button id='button'>Click me</button>
+<script>
+  promise_test(async t => {
+    return testEventType(t, 'auxclick');
+  })
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/event-timing/resources/event-timing-test-utils.js b/tests/wpt/web-platform-tests/event-timing/resources/event-timing-test-utils.js
index bceaa5053d5..9f4a81714f7 100644
--- a/tests/wpt/web-platform-tests/event-timing/resources/event-timing-test-utils.js
+++ b/tests/wpt/web-platform-tests/event-timing/resources/event-timing-test-utils.js
@@ -22,9 +22,9 @@ function mainThreadBusy(duration) {
 // to check that the event also happens to correspond to the first event. In this case, the
 // timings of the 'first-input' entry should be equal to those of this entry. |minDuration|
 // is used to compared against entry.duration.
-function verifyClickEvent(entry, targetId, isFirst=false, minDuration=104) {
+function verifyEvent(entry, eventType, targetId, isFirst=false, minDuration=104) {
   assert_true(entry.cancelable);
-  assert_equals(entry.name, 'mousedown');
+  assert_equals(entry.name, eventType);
   assert_equals(entry.entryType, 'event');
   assert_greater_than_equal(entry.duration, minDuration,
       "The entry's duration should be greater than or equal to " + minDuration + " ms.");
@@ -52,6 +52,10 @@ function verifyClickEvent(entry, targetId, isFirst=false, minDuration=104) {
     assert_equals(entry.target, document.getElementById(targetId));
 }
 
+function verifyClickEvent(entry, targetId, isFirst=false, minDuration=104) {
+  verifyEvent(entry, 'mousedown', targetId, isFirst, minDuration);
+}
+
 function wait() {
   return new Promise((resolve, reject) => {
     step_timeout(() => {
@@ -116,4 +120,53 @@ async function testDuration(t, id, numEntries, dur, fastDur, slowDur) {
     resolve();
   });
   return Promise.all([observerPromise, clicksPromise]);
+}
+
+function applyAction(actions, eventType, target) {
+  if (eventType === 'auxclick') {
+    actions.pointerMove(0, 0, {origin: target})
+    .pointerDown({button: actions.ButtonType.MIDDLE})
+    .pointerUp({button: actions.ButtonType.MIDDLE});
+  } else {
+    assert_unreached('The event type ' + eventType + ' is not supported.');
+  }
+}
+
+// Tests the given |eventType| by creating events whose target are the element with id 'target'.
+// The test assumes that such element already exists.
+async function testEventType(t, eventType) {
+  assert_implements(window.EventCounts, "Event Counts isn't supported");
+  assert_equals(performance.eventCounts.get(eventType), 0);
+  const target = document.getElementById('target');
+  const actions = new test_driver.Actions();
+  // Trigger two 'fast' events of the type.
+  applyAction(actions, eventType, target);
+  applyAction(actions, eventType, target);
+  await actions.send();
+  assert_equals(performance.eventCounts.get('auxclick'), 2);
+  // The durationThreshold used by the observer. A slow events needs to be slower than that.
+  const durationThreshold = 16;
+  // Now add an event handler to cause a slow event.
+  target.addEventListener(eventType, () => {
+    mainThreadBusy(durationThreshold + 4);
+  });
+  return new Promise(async resolve => {
+    new PerformanceObserver(t.step_func(entryList => {
+      let eventTypeEntries = entryList.getEntriesByName(eventType);
+      if (eventTypeEntries.length === 0)
+        return;
+
+      assert_equals(eventTypeEntries.length, 1);
+      verifyEvent(eventTypeEntries[0],
+                  eventType,
+                  'target',
+                  false /* isFirst */,
+                  durationThreshold);
+      assert_equals(performance.eventCounts.get(eventType), 3);
+      resolve();
+    })).observe({type: 'event', durationThreshold: durationThreshold});
+    // Cause a slow event.
+    applyAction(actions, eventType, target);
+    actions.send();
+  });
 }
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/html/canvas/tools/gentestutils.py b/tests/wpt/web-platform-tests/html/canvas/tools/gentestutils.py
index a424e63976c..32147318d0a 100644
--- a/tests/wpt/web-platform-tests/html/canvas/tools/gentestutils.py
+++ b/tests/wpt/web-platform-tests/html/canvas/tools/gentestutils.py
@@ -348,7 +348,7 @@ def genTestUtils(TESTOUTPUTDIR, IMAGEOUTPUTDIR, TEMPLATEFILE, NAME2DIRFILE, ISOF
             scripts += '<script src="%s"></script>\n' % (s)
 
         variants = test.get('script-variants', {})
-        script_variants = [(v, '<script src="%s"></script>\n' % (s)) for (v, s) in variants.iteritems()]
+        script_variants = [(v, '<script src="%s"></script>\n' % (s)) for (v, s) in variants.items()]
         if not script_variants:
             script_variants = [('', '')]
 
diff --git a/tests/wpt/web-platform-tests/html/canvas/tools/tests2d-offscreen.yaml b/tests/wpt/web-platform-tests/html/canvas/tools/tests2d-offscreen.yaml
index 5fe168a66d5..6e8fb7707f7 100644
--- a/tests/wpt/web-platform-tests/html/canvas/tools/tests2d-offscreen.yaml
+++ b/tests/wpt/web-platform-tests/html/canvas/tools/tests2d-offscreen.yaml
@@ -694,7 +694,9 @@
     # The ones that change the output when src = (0,0,0,0):
     ops_trans = [ 'source-in', 'destination-in', 'source-out', 'destination-atop', 'copy' ];
 
-    def calc_output((RA, GA, BA, aA), (RB, GB, BB, aB), FA_code, FB_code):
+    def calc_output(A, B, FA_code, FB_code):
+        RA, GA, BA, aA = A
+        RB, GB, BB, aB = B
         rA, gA, bA = RA*aA, GA*aA, BA*aA
         rB, gB, bB = RB*aB, GB*aB, BB*aB
 
@@ -719,9 +721,11 @@
 
         return (RO, GO, BO, aO)
 
-    def to_test((r,g,b,a)):
+    def to_test(color):
+        r, g, b, a = color
         return '%d,%d,%d,%d' % (round(r), round(g), round(b), round(a*255))
-    def to_cairo((r,g,b,a)):
+    def to_cairo(color):
+        r, g, b, a = color
         return '%f,%f,%f,%f' % (r/255., g/255., b/255., a)
 
     for (name, src, dest) in [
diff --git a/tests/wpt/web-platform-tests/html/canvas/tools/tests2d.yaml b/tests/wpt/web-platform-tests/html/canvas/tools/tests2d.yaml
index 39a75cfa97b..2bbc1986e23 100644
--- a/tests/wpt/web-platform-tests/html/canvas/tools/tests2d.yaml
+++ b/tests/wpt/web-platform-tests/html/canvas/tools/tests2d.yaml
@@ -1053,7 +1053,9 @@
     # The ones that change the output when src = (0,0,0,0):
     ops_trans = [ 'source-in', 'destination-in', 'source-out', 'destination-atop', 'copy' ];
 
-    def calc_output((RA, GA, BA, aA), (RB, GB, BB, aB), FA_code, FB_code):
+    def calc_output(A, B, FA_code, FB_code):
+        (RA, GA, BA, aA) = A
+        (RB, GB, BB, aB) = B
         rA, gA, bA = RA*aA, GA*aA, BA*aA
         rB, gB, bB = RB*aB, GB*aB, BB*aB
 
@@ -1078,9 +1080,11 @@
 
         return (RO, GO, BO, aO)
 
-    def to_test((r,g,b,a)):
+    def to_test(color):
+        r, g, b, a = color
         return '%d,%d,%d,%d' % (round(r), round(g), round(b), round(a*255))
-    def to_cairo((r,g,b,a)):
+    def to_cairo(color):
+        r, g, b, a = color
         return '%f,%f,%f,%f' % (r/255., g/255., b/255., a)
 
     for (name, src, dest) in [
@@ -5559,7 +5563,9 @@
     cr.fill()
     for x in range(1, 100):
         sigma = x/2.0
-        filter = [math.exp(-i*i / (2*sigma*sigma)) / (math.sqrt(2*math.pi)*sigma) for i in range(-24, 26)]
+        filter = []
+        for i in range(-24, 26):
+            filter.append(math.exp(-i*i / (2*sigma*sigma)) / (math.sqrt(2*math.pi)*sigma))
         accum = [0]
         for f in filter:
             accum.append(accum[-1] + f)
@@ -5584,7 +5590,9 @@
     size 100 50
     import math
     sigma = 100.0/2
-    filter = [math.exp(-i*i / (2*sigma*sigma)) / (math.sqrt(2*math.pi)*sigma) for i in range(-200, 100)]
+    filter = []
+    for i in range(-200, 100):
+        filter.append(math.exp(-i*i / (2*sigma*sigma)) / (math.sqrt(2*math.pi)*sigma))
     accum = [0]
     for f in filter:
         accum.append(accum[-1] + f)
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height-ref.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height-ref.html
new file mode 100644
index 00000000000..e5279080f08
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height-ref.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<table style="border: 1px solid red">
+  <thead style="display: block; height: 100px">
+    <tr>
+      <td>
+        thead text
+      </td>
+    </tr>
+  </tr>
+</table>
+
+<table style="border: 1px solid red">
+  <tbody style="display: block; height: 100px">
+    <tr>
+      <td>
+        tbody text
+      </td>
+    </tr>
+  </tr>
+</table>
+
+<table style="border: 1px solid red">
+  <tfoot style="display: block; height: 100px">
+    <tr>
+      <td>
+        tfoot text
+      </td>
+    </tr>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height.html b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height.html
new file mode 100644
index 00000000000..b58311dd723
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/rendering/non-replaced-elements/tables/table-row-group-height.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<link rel="match" href="table-row-group-height-ref.html">
+<table style="border: 1px solid red">
+  <thead style="display: block" height="100">
+    <tr>
+      <td>
+        thead text
+      </td>
+    </tr>
+  </tr>
+</table>
+
+<table style="border: 1px solid red">
+  <tbody style="display: block" height="100">
+    <tr>
+      <td>
+        tbody text
+      </td>
+    </tr>
+  </tr>
+</table>
+
+<table style="border: 1px solid red">
+  <tfoot style="display: block" height="100">
+    <tr>
+      <td>
+        tfoot text
+      </td>
+    </tr>
+  </tr>
+</table>
diff --git a/tests/wpt/web-platform-tests/html/user-activation/consumption-crossorigin.sub.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/consumption-crossorigin.sub.tentative.html
index 01e4d35a43e..31e3fb74e6e 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/consumption-crossorigin.sub.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/consumption-crossorigin.sub.tentative.html
@@ -9,6 +9,7 @@
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
+  <script src="resources/utils.js"></script>
   <script>
     // Frame layout:
     // top=origin0:this-file [
@@ -17,90 +18,75 @@
     //     gchild=origin3:child-two.html
     //   ]
     // ]
-    let test_parent_initial = async_test("Parent frame initial state");
-    let test_parent_final = async_test("Parent frame final state");
-
-    let test_child1_initial = async_test("Child1 frame initial state");
-    let test_child1_final = async_test("Child1 frame final state");
-
-    let test_child_xo_initial = async_test("Child2 frame initial state");
-    let test_child_xo_final = async_test("Child2 frame final state");
-
-    let test_gchild_initial = async_test("Grandchild frame initial state");
-    let test_gchild_final = async_test("Grand child frame final state");
+    let consumption_test = async_test("Consumption test");
 
     let num_children_to_load = 3;
     let num_children_to_report = 3;
 
     function finishLoadPhase() {
-        test_parent_initial.step(() => {
-            assert_true(num_children_to_load == 0);
+        assert_true(num_children_to_load == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_false(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_initial.done();
+        }, "Parent frame initial state");
 
-        test_driver.click(document.getElementById("child1"));
+        delayByFrames(() => test_driver.click(document.getElementById("child1")), 5);
         // The click at "child-xo" happens after receiving "child-one-clicked" msg.
     }
 
     function finishReportPhase() {
-        test_parent_final.step(() => {
-            assert_true(num_children_to_report == 0);
+        assert_true(num_children_to_report == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_true(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_final.done();
-        // End of all tests.
+        }, "Parent frame final state");
+
+        consumption_test.done();
     }
 
     window.addEventListener("message", event => {
         var msg = JSON.parse(event.data);
 
         if (msg.type == 'child-one-loaded') {
-            test_child1_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child1_initial.done();
+            }, "Child1 frame initial state");
         } else if (msg.type == 'child-crossorigin-loaded') {
-            test_child_xo_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child_xo_initial.done();
+            }, "Child2 frame initial state");
         } else if (msg.type == 'child-two-loaded') {
-            test_gchild_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_initial.done();
+            }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-clicked') {
             test_driver.click(document.getElementById("child-xo"));
         } else if (msg.type == 'child-one-report') {
-            test_child1_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child1_final.done();
+            }, "Child1 frame final state");
         } else if (msg.type == 'child-crossorigin-report') {
             // This msg was triggered by a user click followed by a window.open().
-            test_child_xo_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child_xo_final.done();
+            }, "Child2 frame final state");
 
             // Ask remaining frames to report states.
             let ask_report = JSON.stringify({"type": "report"});
             frames[0].postMessage(ask_report, "*");
             frames[1].frames[0].postMessage(ask_report, "*");
         } else if (msg.type == 'child-two-report') {
-            test_gchild_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_final.done();
+            }, "Grand child frame final state");
         }
 
         // Phase switching.
diff --git a/tests/wpt/web-platform-tests/html/user-activation/consumption-sameorigin.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/consumption-sameorigin.tentative.html
index 140642c97dd..50f2feaa638 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/consumption-sameorigin.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/consumption-sameorigin.tentative.html
@@ -17,87 +17,72 @@
     //     gchild=child-two.html
     //   ]
     // ]
-    let test_parent_initial = async_test("Parent frame initial state");
-    let test_parent_final = async_test("Parent frame final state");
-
-    let test_child1_initial = async_test("Child1 frame initial state");
-    let test_child1_final = async_test("Child1 frame final state");
-
-    let test_child_so_initial = async_test("Child2 frame initial state");
-    let test_child_so_final = async_test("Child2 frame final state");
-
-    let test_gchild_initial = async_test("Grandchild frame initial state");
-    let test_gchild_final = async_test("Grand child frame final state");
+    let consumption_test = async_test("Consumption test");
 
     let num_children_to_load = 3;
     let num_children_to_report = 3;
 
     function finishLoadPhase() {
-        test_parent_initial.step(() => {
-            assert_true(num_children_to_load == 0);
+        assert_true(num_children_to_load == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_false(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_initial.done();
+        }, "Parent frame initial state");
 
         test_driver.click(document.getElementById("child-so"));
     }
 
     function finishReportPhase() {
-        test_parent_final.step(() => {
-            assert_true(num_children_to_report == 0);
+        assert_true(num_children_to_report == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_true(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_final.done();
-        // End of all tests.
+        }, "Parent frame final state");
+
+        consumption_test.done();
     }
 
     window.addEventListener("message", event => {
         var msg = JSON.parse(event.data);
 
         if (msg.type == 'child-one-loaded') {
-            test_child1_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child1_initial.done();
+            }, "Child1 frame initial state");
         } else if (msg.type == 'child-sameorigin-loaded') {
-            test_child_so_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child_so_initial.done();
+            }, "Child2 frame initial state");
         } else if (msg.type == 'child-two-loaded') {
-            test_gchild_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_initial.done();
+            }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-report') {
-            test_child1_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child1_final.done();
+            }, "Child1 frame final state");
         } else if (msg.type == 'child-sameorigin-report') {
             // This msg was triggered by a user click followed by a window.open().
-            test_child_so_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child_so_final.done();
+            }, "Child2 frame final state");
 
             // Ask remaining frames to report states.
             let ask_report = JSON.stringify({"type": "report"});
             frames[0].postMessage(ask_report, "*");
             frames[1].frames[0].postMessage(ask_report, "*");
         } else if (msg.type == 'child-two-report') {
-            test_gchild_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_gchild_final.done();
+            }, "Grand child frame final state");
         }
 
         // Phase switching.
diff --git a/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-crossorigin.sub.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-crossorigin.sub.tentative.html
index 5839836a0d8..595a12ca70f 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-crossorigin.sub.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-crossorigin.sub.tentative.html
@@ -5,10 +5,11 @@
 -->
 <html>
 <head>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="resources/utils.js"></script>
 </head>
 <body>
   <h1>Post-navigation activation state in child</h1>
@@ -30,7 +31,7 @@
               assert_false(msg.isActive);
               assert_false(msg.hasBeenActive);
 
-              test_driver.click(child);
+              delayByFrames(() => test_driver.click(child), 5);
           } else if (msg.type == 'child-one-clicked') {
               assert_true(navigator.userActivation.isActive);
               assert_true(navigator.userActivation.hasBeenActive);
diff --git a/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-sameorigin.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-sameorigin.tentative.html
index 144d7d4bf50..412b01fcb3b 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-sameorigin.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/navigation-state-reset-sameorigin.tentative.html
@@ -5,10 +5,10 @@
 -->
 <html>
 <head>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
 </head>
 <body>
   <h1>Post-navigation activation state in child</h1>
diff --git a/tests/wpt/web-platform-tests/html/user-activation/propagation-crossorigin.sub.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/propagation-crossorigin.sub.tentative.html
index a2f578f53b9..775217ed17f 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/propagation-crossorigin.sub.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/propagation-crossorigin.sub.tentative.html
@@ -9,6 +9,7 @@
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
+  <script src="resources/utils.js"></script>
   <script>
     // Frame layout:
     // top=origin0:this-file [
@@ -17,87 +18,72 @@
     //     gchild=origin3:child-two.html
     //   ]
     // ]
-    let test_parent_initial = async_test("Parent frame initial state");
-    let test_parent_final = async_test("Parent frame final state");
-
-    let test_child1_initial = async_test("Child1 frame initial state");
-    let test_child1_final = async_test("Child1 frame final state");
-
-    let test_child_xo_initial = async_test("Child2 frame initial state");
-    let test_child_xo_final = async_test("Child2 frame final state");
-
-    let test_gchild_initial = async_test("Grandchild frame initial state");
-    let test_gchild_final = async_test("Grand child frame final state");
+    let propagation_test = async_test("Propagation test");
 
     let num_children_to_load = 3;
     let num_children_to_report = 3;
 
     function finishLoadPhase() {
-        test_parent_initial.step(() => {
-            assert_true(num_children_to_load == 0);
+        assert_true(num_children_to_load == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_false(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_initial.done();
+        }, "Parent frame initial state");
 
-        test_driver.click(document.getElementById("child-xo"));
+        delayByFrames(() => test_driver.click(document.getElementById("child-xo")), 5);
     }
 
     function finishReportPhase() {
-        test_parent_final.step(() => {
-            assert_true(num_children_to_report == 0);
+        assert_true(num_children_to_report == 0);
+
+        test(() => {
             assert_true(navigator.userActivation.isActive);
             assert_true(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_final.done();
-        // End of all tests.
+        }, "Parent frame final state");
+
+        propagation_test.done();
     }
 
     window.addEventListener("message", event => {
         var msg = JSON.parse(event.data);
 
         if (msg.type == 'child-one-loaded') {
-            test_child1_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child1_initial.done();
+            }, "Child1 frame initial state");
         } else if (msg.type == 'child-crossorigin-loaded') {
-            test_child_xo_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child_xo_initial.done();
+            }, "Child2 frame initial state");
         } else if (msg.type == 'child-two-loaded') {
-            test_gchild_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_initial.done();
+            }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-report') {
-            test_child1_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child1_final.done();
+            }, "Child1 frame final state");
         } else if (msg.type == 'child-crossorigin-report') {
             // This msg was triggered by a user click.
-            test_child_xo_final.step(() => {
+            test(() => {
                 assert_true(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child_xo_final.done();
+            }, "Child2 frame final state");
 
             // Ask remaining frames to report states.
             let ask_report = JSON.stringify({"type": "report"});
             frames[0].postMessage(ask_report, "*");
             frames[1].frames[0].postMessage(ask_report, "*");
         } else if (msg.type == 'child-two-report') {
-            test_gchild_final.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_final.done();
+            }, "Grand child frame final state");
         }
 
         // Phase switching.
diff --git a/tests/wpt/web-platform-tests/html/user-activation/propagation-sameorigin.tentative.html b/tests/wpt/web-platform-tests/html/user-activation/propagation-sameorigin.tentative.html
index 76d2b68fa70..281e0ce6904 100644
--- a/tests/wpt/web-platform-tests/html/user-activation/propagation-sameorigin.tentative.html
+++ b/tests/wpt/web-platform-tests/html/user-activation/propagation-sameorigin.tentative.html
@@ -17,87 +17,72 @@
     //     gchild=child-two.html
     //   ]
     // ]
-    let test_parent_initial = async_test("Parent frame initial state");
-    let test_parent_final = async_test("Parent frame final state");
-
-    let test_child1_initial = async_test("Child1 frame initial state");
-    let test_child1_final = async_test("Child1 frame final state");
-
-    let test_child_so_initial = async_test("Child2 frame initial state");
-    let test_child_so_final = async_test("Child2 frame final state");
-
-    let test_gchild_initial = async_test("Grandchild frame initial state");
-    let test_gchild_final = async_test("Grand child frame final state");
+    let propagation_test = async_test("Propagation test");
 
     let num_children_to_load = 3;
     let num_children_to_report = 3;
 
     function finishLoadPhase() {
-        test_parent_initial.step(() => {
-            assert_true(num_children_to_load == 0);
+        assert_true(num_children_to_load == 0);
+
+        test(() => {
             assert_false(navigator.userActivation.isActive);
             assert_false(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_initial.done();
+        }, "Parent frame initial state");
 
         test_driver.click(document.getElementById("child-so"));
     }
 
     function finishReportPhase() {
-        test_parent_final.step(() => {
-            assert_true(num_children_to_report == 0);
+        assert_true(num_children_to_report == 0);
+
+        test(() => {
             assert_true(navigator.userActivation.isActive);
             assert_true(navigator.userActivation.hasBeenActive);
-        });
-        test_parent_final.done();
-        // End of all tests.
+        }, "Parent frame final state");
+
+        propagation_test.done();
     }
 
     window.addEventListener("message", event => {
         var msg = JSON.parse(event.data);
 
         if (msg.type == 'child-one-loaded') {
-            test_child1_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child1_initial.done();
+            }, "Child1 frame initial state");
         } else if (msg.type == 'child-sameorigin-loaded') {
-            test_child_so_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_child_so_initial.done();
+            }, "Child2 frame initial state");
         } else if (msg.type == 'child-two-loaded') {
-            test_gchild_initial.step(() => {
+            test(() => {
                 assert_false(msg.isActive);
                 assert_false(msg.hasBeenActive);
-            });
-            test_gchild_initial.done();
+            }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-report') {
-            test_child1_final.step(() => {
+            test(() => {
                 assert_true(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child1_final.done();
+            }, "Child1 frame final state");
         } else if (msg.type == 'child-sameorigin-report') {
             // This msg was triggered by a user click.
-            test_child_so_final.step(() => {
+            test(() => {
                 assert_true(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_child_so_final.done();
+            }, "Child2 frame final state");
 
             // Ask remaining frames to report states.
             let ask_report = JSON.stringify({"type": "report"});
             frames[0].postMessage(ask_report, "*");
             frames[1].frames[0].postMessage(ask_report, "*");
         } else if (msg.type == 'child-two-report') {
-            test_gchild_final.step(() => {
+            test(() => {
                 assert_true(msg.isActive);
                 assert_true(msg.hasBeenActive);
-            });
-            test_gchild_final.done();
+            }, "Grand child frame final state");
         }
 
         // Phase switching.
diff --git a/tests/wpt/web-platform-tests/html/user-activation/resources/utils.js b/tests/wpt/web-platform-tests/html/user-activation/resources/utils.js
new file mode 100644
index 00000000000..06bf0183283
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/user-activation/resources/utils.js
@@ -0,0 +1,9 @@
+function delayByFrames(f, num_frames) {
+  function recurse(depth) {
+    if (depth == 0)
+      f();
+    else
+      requestAnimationFrame(() => recurse(depth-1));
+  }
+  recurse(num_frames);
+}
diff --git a/tests/wpt/web-platform-tests/infrastructure/testdriver/file_upload.py b/tests/wpt/web-platform-tests/infrastructure/testdriver/file_upload.py
index 32633679a9f..89ed67a79ef 100644
--- a/tests/wpt/web-platform-tests/infrastructure/testdriver/file_upload.py
+++ b/tests/wpt/web-platform-tests/infrastructure/testdriver/file_upload.py
@@ -1,2 +1,2 @@
 def main(request, response):
-    return "PASS" if request.POST["file_input"].file.read() == b"File to upload\n" else "FAIL"
+    return "PASS" if request.POST[b"file_input"].file.read() == b"File to upload\n" else "FAIL"
diff --git a/tests/wpt/web-platform-tests/interfaces/html.idl b/tests/wpt/web-platform-tests/interfaces/html.idl
index c9018f1b63d..7b2a96ce676 100644
--- a/tests/wpt/web-platform-tests/interfaces/html.idl
+++ b/tests/wpt/web-platform-tests/interfaces/html.idl
@@ -1504,7 +1504,7 @@ interface ElementInternals {
 
   readonly attribute HTMLFormElement? form;
 
-  void setValidity(ValidityStateFlags flags,
+  void setValidity(optional ValidityStateFlags flags = {},
                    optional DOMString message,
                    optional HTMLElement anchor);
   readonly attribute boolean willValidate;
diff --git a/tests/wpt/web-platform-tests/interfaces/periodic-background-sync.idl b/tests/wpt/web-platform-tests/interfaces/periodic-background-sync.idl
new file mode 100644
index 00000000000..14ee8bbc30d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/interfaces/periodic-background-sync.idl
@@ -0,0 +1,35 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: Web Periodic Background Synchronization (https://wicg.github.io/periodic-background-sync/)
+
+partial interface ServiceWorkerGlobalScope {
+    attribute EventHandler onperiodicsync;
+};
+
+[Exposed=(Window,Worker)]
+partial interface ServiceWorkerRegistration {
+  readonly attribute PeriodicSyncManager periodicSync;
+};
+
+[Exposed=(Window,Worker)]
+interface PeriodicSyncManager {
+    Promise<void> register(DOMString tag, optional BackgroundSyncOptions options);
+    Promise<sequence<DOMString>> getTags();
+    Promise<void> unregister(DOMString tag);
+};
+
+dictionary BackgroundSyncOptions {
+    [EnforceRange] unsigned long long minInterval = 0;
+};
+
+dictionary PeriodicSyncEventInit : ExtendableEventInit {
+    required DOMString tag;
+};
+
+[
+    Constructor(DOMString type, PeriodicSyncEventInit init),
+    Exposed=ServiceWorker
+] interface PeriodicSyncEvent : ExtendableEvent {
+    readonly attribute DOMString tag;
+  };
diff --git a/tests/wpt/web-platform-tests/periodic-background-sync/idlharness.https.any.js b/tests/wpt/web-platform-tests/periodic-background-sync/idlharness.https.any.js
index 47c5e3fd04f..6f3b6fdf87a 100644
--- a/tests/wpt/web-platform-tests/periodic-background-sync/idlharness.https.any.js
+++ b/tests/wpt/web-platform-tests/periodic-background-sync/idlharness.https.any.js
@@ -1,38 +1,20 @@
 // META: script=/resources/WebIDLParser.js
 // META: script=/resources/idlharness.js
+// META: timeout=long
 
 'use strict';
 
 // https://wicg.github.io/periodic-background-sync/
 
-const idl = `
-partial interface ServiceWorkerGlobalScope {
-    attribute EventHandler onperiodicsync;
-};
-[
-  Exposed=(Window,Worker)
-] partial interface ServiceWorkerRegistration {
-    readonly attribute PeriodicSyncManager periodicSync;
-    readonly attribute SyncManager sync;
-};
-dictionary PeriodicSyncEventInit : ExtendableEventInit {
-    required DOMString tag;
-};
-[
-  Constructor(DOMString type, PeriodicSyncEventInit init),
-  Exposed=ServiceWorker
-] interface PeriodicSyncEvent : ExtendableEvent {
-    readonly attribute DOMString tag;
-};
-`;
-
-test(t => {
-  const idlArray = new IdlArray();
-  idlArray.add_idls(idl);
-  idlArray.add_objects({
-    ServiceWorkerGlobalScope: ['self', 'onperiodicsync'],
-    ServiceWorkerRegistration: ['registration'],
-    PeriodicSyncManager: ['registration.periodicSync'],
-    PeriodicSyncEvent: ['new PeriodicSyncEvent("tag")'],
-  });
-}, 'IDL test for Periodic Background Sync');
+idl_test(
+  ['periodic-background-sync'],
+  ['service-workers', 'html', 'dom'],
+  async idl_array => {
+    idl_array.add_objects({
+      ServiceWorkerGlobalScope: ['self', 'onperiodicsync'],
+      ServiceWorkerRegistration: ['registration'],
+      PeriodicSyncManager: ['registration.periodicSync'],
+      PeriodicSyncEvent: ['new PeriodicSyncEvent("tag")'],
+    });
+  }
+);
diff --git a/tests/wpt/web-platform-tests/resources/idlharness.js b/tests/wpt/web-platform-tests/resources/idlharness.js
index 139ee5e167f..02233ee0d33 100644
--- a/tests/wpt/web-platform-tests/resources/idlharness.js
+++ b/tests/wpt/web-platform-tests/resources/idlharness.js
@@ -1220,6 +1220,7 @@ IdlArray.prototype.assert_type_is = function(value, type)
         case "Float64Array":
         case "ArrayBuffer":
         case "DataView":
+        case "Function":
             assert_true(value instanceof self[type], "wrong type: not a " + type);
             return;
 
diff --git a/tests/wpt/web-platform-tests/resources/testharness.js b/tests/wpt/web-platform-tests/resources/testharness.js
index 360ed5d845b..bd7a8bab005 100644
--- a/tests/wpt/web-platform-tests/resources/testharness.js
+++ b/tests/wpt/web-platform-tests/resources/testharness.js
@@ -1212,7 +1212,7 @@ policies and contribution forms [3].
                  } else {
                      assert(same_value(actual[p], expected[p]), "assert_object_equals", description,
                                                        "property ${p} expected ${expected} got ${actual}",
-                                                       {p:p, expected:expected, actual:actual});
+                                                       {p:p, expected:expected[p], actual:actual[p]});
                  }
              }
              for (p in expected) {
diff --git a/tests/wpt/web-platform-tests/resources/webidl2/lib/webidl2.js b/tests/wpt/web-platform-tests/resources/webidl2/lib/webidl2.js
index 2a174c92ebe..d707905fa63 100644
--- a/tests/wpt/web-platform-tests/resources/webidl2/lib/webidl2.js
+++ b/tests/wpt/web-platform-tests/resources/webidl2/lib/webidl2.js
@@ -109,6 +109,10 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(31);
 /* harmony reexport (safe) */ __webpack_require__.d(__webpack_exports__, "validate", function() { return _lib_validator_js__WEBPACK_IMPORTED_MODULE_2__["validate"]; });
 
+/* harmony import */ var _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(2);
+/* harmony reexport (safe) */ __webpack_require__.d(__webpack_exports__, "WebIDLParseError", function() { return _lib_tokeniser_js__WEBPACK_IMPORTED_MODULE_3__["WebIDLParseError"]; });
+
+
 
 
 
@@ -124,7 +128,7 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(2);
 /* harmony import */ var _productions_enum_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(15);
 /* harmony import */ var _productions_includes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(16);
-/* harmony import */ var _productions_extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(10);
+/* harmony import */ var _productions_extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(8);
 /* harmony import */ var _productions_typedef_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(17);
 /* harmony import */ var _productions_callback_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(18);
 /* harmony import */ var _productions_interface_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(19);
@@ -132,6 +136,8 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _productions_dictionary_js__WEBPACK_IMPORTED_MODULE_8__ = __webpack_require__(26);
 /* harmony import */ var _productions_namespace_js__WEBPACK_IMPORTED_MODULE_9__ = __webpack_require__(28);
 /* harmony import */ var _productions_callback_interface_js__WEBPACK_IMPORTED_MODULE_10__ = __webpack_require__(29);
+/* harmony import */ var _productions_helpers_js__WEBPACK_IMPORTED_MODULE_11__ = __webpack_require__(4);
+
 
 
 
@@ -210,7 +216,7 @@ function parseByTokens(tokeniser, options) {
         if (ea.length) error("Stray extended attributes");
         break;
       }
-      def.extAttrs = ea;
+      Object(_productions_helpers_js__WEBPACK_IMPORTED_MODULE_11__["autoParenter"])(def).extAttrs = ea;
       defs.push(def);
     }
     const eof = consume("eof");
@@ -224,6 +230,12 @@ function parseByTokens(tokeniser, options) {
   return res;
 }
 
+/**
+ * @param {string} str
+ * @param {object} [options]
+ * @param {*} [options.sourceName]
+ * @param {boolean} [options.concrete]
+ */
 function parse(str, options = {}) {
   const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_0__["Tokeniser"](str);
   if (typeof options.sourceName !== "undefined") {
@@ -239,9 +251,11 @@ function parse(str, options = {}) {
 
 "use strict";
 __webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "typeNameKeywords", function() { return typeNameKeywords; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "stringTypes", function() { return stringTypes; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "argumentNameKeywords", function() { return argumentNameKeywords; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Tokeniser", function() { return Tokeniser; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "WebIDLParseError", function() { return WebIDLParseError; });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
 /* harmony import */ var _productions_helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
 
@@ -261,6 +275,23 @@ const tokenRe = {
   "other": /[^\t\n\r 0-9A-Za-z]/y
 };
 
+const typeNameKeywords = [
+  "ArrayBuffer",
+  "DataView",
+  "Int8Array",
+  "Int16Array",
+  "Int32Array",
+  "Uint8Array",
+  "Uint16Array",
+  "Uint32Array",
+  "Uint8ClampedArray",
+  "Float32Array",
+  "Float64Array",
+  "any",
+  "object",
+  "symbol"
+];
+
 const stringTypes = [
   "ByteString",
   "DOMString",
@@ -299,10 +330,8 @@ const nonRegexTerminals = [
   "Infinity",
   "NaN",
   "Promise",
-  "async",
   "boolean",
   "byte",
-  "constructor",
   "double",
   "false",
   "float",
@@ -319,7 +348,7 @@ const nonRegexTerminals = [
   "true",
   "unsigned",
   "void"
-].concat(argumentNameKeywords, stringTypes);
+].concat(argumentNameKeywords, stringTypes, typeNameKeywords);
 
 const punctuations = [
   "(",
@@ -346,6 +375,7 @@ const reserved = [
 ];
 
 /**
+ * @typedef {ArrayItemType<ReturnType<typeof tokenise>>} Token
  * @param {string} str
  */
 function tokenise(str) {
@@ -422,8 +452,8 @@ function tokenise(str) {
   return tokens;
 
   /**
-   * @param {keyof tokenRe} type
-   * @param {object} [options]
+   * @param {keyof typeof tokenRe} type
+   * @param {object} options
    * @param {boolean} [options.noFlushTrivia]
    */
   function attemptTokenMatch(type, { noFlushTrivia } = {}) {
@@ -452,6 +482,7 @@ class Tokeniser {
 
   /**
    * @param {string} message
+   * @return {never}
    */
   error(message) {
     throw new WebIDLParseError(Object(_error_js__WEBPACK_IMPORTED_MODULE_0__["syntaxError"])(this.source, this.position, this.current, message));
@@ -485,6 +516,16 @@ class Tokeniser {
 }
 
 class WebIDLParseError extends Error {
+  /**
+   * @param {object} options
+   * @param {string} options.message
+   * @param {string} options.bareMessage
+   * @param {string} options.context
+   * @param {number} options.line
+   * @param {*} options.sourceName
+   * @param {string} options.input
+   * @param {*[]} options.tokens
+   */
   constructor({ message, bareMessage, context, line, sourceName, input, tokens }) {
     super(message);
 
@@ -517,8 +558,8 @@ function lastLine(text) {
 
 /**
  * @typedef {object} WebIDL2ErrorOptions
- * @property {"error" | "warning"} level
- * @property {Function} autofix
+ * @property {"error" | "warning"} [level]
+ * @property {Function} [autofix]
  *
  * @param {string} message error message
  * @param {"Syntax" | "Validation"} kind error type
@@ -609,7 +650,6 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "const_value", function() { return const_value; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "const_data", function() { return const_data; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "primitive_type", function() { return primitive_type; });
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "identifiers", function() { return identifiers; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "argument_list", function() { return argument_list; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "type_with_extended_attributes", function() { return type_with_extended_attributes; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "return_type", function() { return return_type; });
@@ -618,14 +658,14 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "getMemberIndentation", function() { return getMemberIndentation; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "autofixAddExposedWindow", function() { return autofixAddExposedWindow; });
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "getFirstToken", function() { return getFirstToken; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "findLastIndex", function() { return findLastIndex; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "autoParenter", function() { return autoParenter; });
 /* harmony import */ var _type_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(5);
-/* harmony import */ var _argument_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(8);
-/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(12);
-/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(10);
-/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(13);
-/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(14);
-/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(2);
-
+/* harmony import */ var _argument_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(11);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
+/* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(13);
+/* harmony import */ var _attribute_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(14);
+/* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(2);
 
 
 
@@ -736,17 +776,6 @@ function primitive_type(tokeniser) {
   }
 }
 
-/**
- * @param {import("../tokeniser").Tokeniser} tokeniser
- */
-function identifiers(tokeniser) {
-  const ids = list(tokeniser, { parser: _token_js__WEBPACK_IMPORTED_MODULE_2__["Token"].parser(tokeniser, "identifier"), listName: "identifier list" });
-  if (!ids.length) {
-    tokeniser.error("Expected identifiers but none found");
-  }
-  return ids;
-}
-
 /**
  * @param {import("../tokeniser").Tokeniser} tokeniser
  */
@@ -759,9 +788,9 @@ function argument_list(tokeniser) {
  * @param {string} typeName
  */
 function type_with_extended_attributes(tokeniser, typeName) {
-  const extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__["ExtendedAttributes"].parse(tokeniser);
+  const extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__["ExtendedAttributes"].parse(tokeniser);
   const ret = _type_js__WEBPACK_IMPORTED_MODULE_0__["Type"].parse(tokeniser, typeName);
-  if (ret) ret.extAttrs = extAttrs;
+  if (ret) autoParenter(ret).extAttrs = extAttrs;
   return ret;
 }
 
@@ -788,8 +817,8 @@ function return_type(tokeniser, typeName) {
 function stringifier(tokeniser) {
   const special = tokeniser.consume("stringifier");
   if (!special) return;
-  const member = _attribute_js__WEBPACK_IMPORTED_MODULE_5__["Attribute"].parse(tokeniser, { special }) ||
-    _operation_js__WEBPACK_IMPORTED_MODULE_4__["Operation"].parse(tokeniser, { special }) ||
+  const member = _attribute_js__WEBPACK_IMPORTED_MODULE_4__["Attribute"].parse(tokeniser, { special }) ||
+    _operation_js__WEBPACK_IMPORTED_MODULE_3__["Operation"].parse(tokeniser, { special }) ||
     tokeniser.error("Unterminated stringifier");
   return member;
 }
@@ -825,8 +854,8 @@ function getMemberIndentation(parentTrivia) {
 function autofixAddExposedWindow(def) {
   return () => {
     if (def.extAttrs.length){
-      const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_6__["Tokeniser"]("Exposed=Window,");
-      const exposed = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__["SimpleExtendedAttribute"].parse(tokeniser);
+      const tokeniser = new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__["Tokeniser"]("Exposed=Window,");
+      const exposed = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__["SimpleExtendedAttribute"].parse(tokeniser);
       exposed.tokens.separator = tokeniser.consume(",");
       const existing = def.extAttrs[0];
       if (!/^\s/.test(existing.tokens.name.trivia)) {
@@ -834,7 +863,7 @@ function autofixAddExposedWindow(def) {
       }
       def.extAttrs.unshift(exposed);
     } else {
-      def.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_3__["ExtendedAttributes"].parse(new _tokeniser_js__WEBPACK_IMPORTED_MODULE_6__["Tokeniser"]("[Exposed=Window]"));
+      autoParenter(def).extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__["ExtendedAttributes"].parse(new _tokeniser_js__WEBPACK_IMPORTED_MODULE_5__["Tokeniser"]("[Exposed=Window]"));
       const trivia = def.tokens.base.trivia;
       def.extAttrs.tokens.open.trivia = trivia;
       def.tokens.base.trivia = `\n${getLastIndentation(trivia)}`;
@@ -850,13 +879,73 @@ function getFirstToken(data) {
   if (data.extAttrs.length) {
     return data.extAttrs.tokens.open;
   }
-  if (data.type === "operation") {
+  if (data.type === "operation" && !data.special) {
     return getFirstToken(data.idlType);
   }
   const tokens = Object.values(data.tokens).sort((x, y) => x.index - y.index);
   return tokens[0];
 }
 
+/**
+ * @template T
+ * @param {T[]} array
+ * @param {(item: T) => boolean} predicate
+ */
+function findLastIndex(array, predicate) {
+  const index = array.slice().reverse().findIndex(predicate);
+  if (index === -1) {
+    return index;
+  }
+  return array.length - index - 1;
+}
+
+/**
+ * Returns a proxy that auto-assign `parent` field.
+ * @template T
+ * @param {T} data
+ * @param {*} [parent] The object that will be assigned to `parent`.
+ *                     If absent, it will be `data` by default.
+ * @return {T}
+ */
+function autoParenter(data, parent) {
+  if (!parent) {
+    // Defaults to `data` unless specified otherwise.
+    parent = data;
+  }
+  if (!data) {
+    // This allows `autoParenter(undefined)` which again allows
+    // `autoParenter(parse())` where the function may return nothing.
+    return data;
+  }
+  return new Proxy(data, {
+    get(target, p) {
+      const value = target[p];
+      if (Array.isArray(value)) {
+        // Wraps the array so that any added items will also automatically
+        // get their `parent` values.
+        return autoParenter(value, target);
+      }
+      return value;
+    },
+    set(target, p, value) {
+      target[p] = value;
+      if (!value) {
+        return true;
+      } else if (Array.isArray(value)) {
+        // Assigning an array will add `parent` to its items.
+        for (const item of value) {
+          if (typeof item.parent !== "undefined") {
+            item.parent = parent;
+          }
+        }
+      } else if (typeof value.parent !== "undefined") {
+        value.parent = parent;
+      }
+      return true;
+    }
+  });
+}
+
 
 /***/ }),
 /* 5 */
@@ -870,6 +959,8 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(2);
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(3);
 /* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(7);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(8);
+
 
 
 
@@ -885,7 +976,7 @@ function generic_type(tokeniser, typeName) {
   if (!base) {
     return;
   }
-  const ret = new Type({ source: tokeniser.source, tokens: { base } });
+  const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Type({ source: tokeniser.source, tokens: { base } }));
   ret.tokens.open = tokeniser.consume("<") || tokeniser.error(`No opening bracket after ${base.type}`);
   switch (base.type) {
     case "Promise": {
@@ -913,7 +1004,7 @@ function generic_type(tokeniser, typeName) {
   }
   if (!ret.idlType) tokeniser.error(`Error parsing generic type ${base.type}`);
   ret.tokens.close = tokeniser.consume(">") || tokeniser.error(`Missing closing bracket after ${base.type}`);
-  return ret;
+  return ret.this;
 }
 
 /**
@@ -934,7 +1025,7 @@ function type_suffix(tokeniser, obj) {
 function single_type(tokeniser, typeName) {
   let ret = generic_type(tokeniser, typeName) || Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["primitive_type"])(tokeniser);
   if (!ret) {
-    const base = tokeniser.consume("identifier", ..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__["stringTypes"]);
+    const base = tokeniser.consume("identifier", ..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__["stringTypes"], ..._tokeniser_js__WEBPACK_IMPORTED_MODULE_2__["typeNameKeywords"]);
     if (!base) {
       return;
     }
@@ -958,11 +1049,12 @@ function union_type(tokeniser, type) {
   const tokens = {};
   tokens.open = tokeniser.consume("(");
   if (!tokens.open) return;
-  const ret = new Type({ source: tokeniser.source, tokens });
+  const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Type({ source: tokeniser.source, tokens }));
   ret.type = type || null;
   while (true) {
     const typ = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["type_with_extended_attributes"])(tokeniser) || tokeniser.error("No type after open parenthesis or 'or' in union type");
     if (typ.idlType === "any") tokeniser.error("Type `any` cannot be included in a union type");
+    if (typ.generic === "Promise") tokeniser.error("Type `Promise` cannot be included in a union type");
     ret.subtype.push(typ);
     const or = tokeniser.consume("or");
     if (or) {
@@ -975,7 +1067,7 @@ function union_type(tokeniser, type) {
   }
   tokens.close = tokeniser.consume(")") || tokeniser.error("Unterminated union type");
   type_suffix(tokeniser, ret);
-  return ret;
+  return ret.this;
 }
 
 class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
@@ -989,8 +1081,8 @@ class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 
   constructor({ source, tokens }) {
     super({ source, tokens });
-    Object.defineProperty(this, "subtype", { value: [] });
-    this.extAttrs = [];
+    Object.defineProperty(this, "subtype", { value: [], writable: true });
+    this.extAttrs = new _extended_attributes_js__WEBPACK_IMPORTED_MODULE_5__["ExtendedAttributes"]({});
   }
 
   get generic() {
@@ -1019,6 +1111,7 @@ class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   }
 
   *validate(defs) {
+    yield* this.extAttrs.validate(defs);
     /*
      * If a union is nullable, its subunions cannot include a dictionary
      * If not, subunions may include dictionaries if each union is not nullable
@@ -1030,7 +1123,7 @@ class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
       undefined;
     if (target && this.nullable) {
       // do not allow any dictionary
-      const reference = Object(_validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__["idlTypeIncludesDictionary"])(target, defs);
+      const { reference } = Object(_validators_helpers_js__WEBPACK_IMPORTED_MODULE_4__["idlTypeIncludesDictionary"])(target, defs) || {};
       if (reference) {
         const targetToken = (this.union ? reference : this).tokens.base;
         const message = `Nullable union cannot include a dictionary type`;
@@ -1053,11 +1146,20 @@ class Type extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 "use strict";
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Base", function() { return Base; });
+// @ts-check
+
 class Base {
+  /**
+   * @param {object} initializer
+   * @param {Base["source"]} initializer.source
+   * @param {Base["tokens"]} initializer.tokens
+   */
   constructor({ source, tokens }) {
     Object.defineProperties(this, {
       source: { value: source },
-      tokens: { value: tokens }
+      tokens: { value: tokens, writable: true },
+      parent: { value: null, writable: true },
+      this: { value: this } // useful when escaping from proxy
     });
   }
 
@@ -1068,6 +1170,7 @@ class Base {
       const descMap = Object.getOwnPropertyDescriptors(proto);
       for (const [key, value] of Object.entries(descMap)) {
         if (value.enumerable || value.get) {
+          // @ts-ignore - allow indexing here
           json[key] = this[key];
         }
       }
@@ -1085,12 +1188,17 @@ class Base {
 "use strict";
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "idlTypeIncludesDictionary", function() { return idlTypeIncludesDictionary; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "dictionaryIncludesRequiredField", function() { return dictionaryIncludesRequiredField; });
+// @ts-check
+
 /**
+ * @typedef {import("../productions/dictionary.js").Dictionary} Dictionary
+ *
  * @param {*} idlType
- * @param {*[]} defs
+ * @param {import("../validator.js").Definitions} defs
  * @param {object} [options]
  * @param {boolean} [options.useNullableInner] use when the input idlType is nullable and you want to use its inner type
- * @return the type reference that ultimately includes dictionary.
+ * @return {{ reference: *, dictionary: Dictionary }} the type reference that ultimately includes dictionary.
  */
 function idlTypeIncludesDictionary(idlType, defs, { useNullableInner } = {}) {
   if (!idlType.union) {
@@ -1099,7 +1207,7 @@ function idlTypeIncludesDictionary(idlType, defs, { useNullableInner } = {}) {
       return;
     }
     if (def.type === "typedef") {
-      const { typedefIncludesDictionary} = defs.cache;
+      const { typedefIncludesDictionary } = defs.cache;
       if (typedefIncludesDictionary.has(def)) {
         // Note that this also halts when it met indeterminate state
         // to prevent infinite recursion
@@ -1109,11 +1217,17 @@ function idlTypeIncludesDictionary(idlType, defs, { useNullableInner } = {}) {
       const result = idlTypeIncludesDictionary(def.idlType, defs);
       defs.cache.typedefIncludesDictionary.set(def, result);
       if (result) {
-        return idlType;
+        return {
+          reference: idlType,
+          dictionary: result.dictionary
+        };
       }
     }
     if (def.type === "dictionary" && (useNullableInner || !idlType.nullable)) {
-      return idlType;
+      return {
+        reference: idlType,
+        dictionary: def
+      };
     }
   }
   for (const subtype of idlType.subtype) {
@@ -1122,26 +1236,324 @@ function idlTypeIncludesDictionary(idlType, defs, { useNullableInner } = {}) {
       if (subtype.union) {
         return result;
       }
-      return subtype;
+      return {
+        reference: subtype,
+        dictionary: result.dictionary
+      };
     }
   }
 }
 
+/**
+ * @param {*} dict dictionary type
+ * @param {import("../validator.js").Definitions} defs
+ * @return {boolean}
+ */
+function dictionaryIncludesRequiredField(dict, defs) {
+  if (defs.cache.dictionaryIncludesRequiredField.has(dict)) {
+    return defs.cache.dictionaryIncludesRequiredField.get(dict);
+  }
+  defs.cache.dictionaryIncludesRequiredField.set(dict, undefined); // indeterminate
+  if (dict.inheritance) {
+    const superdict = defs.unique.get(dict.inheritance);
+    if (!superdict) {
+      return true;
+    }
+    if (dictionaryIncludesRequiredField(superdict, defs)) {
+      return true;
+    }
+  }
+  const result = dict.members.some(field => field.required);
+  defs.cache.dictionaryIncludesRequiredField.set(dict, result);
+  return result;
+}
+
 
 /***/ }),
 /* 8 */
 /***/ (function(module, __webpack_exports__, __webpack_require__) {
 
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "SimpleExtendedAttribute", function() { return SimpleExtendedAttribute; });
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "ExtendedAttributes", function() { return ExtendedAttributes; });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _array_base_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(9);
+/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(10);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(4);
+/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(3);
+
+
+
+
+
+
+/**
+ * @param {import("../tokeniser").Tokeniser} tokeniser
+ * @param {string} tokenName
+ */
+function tokens(tokeniser, tokenName) {
+  return Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["list"])(tokeniser, {
+    parser: _token_js__WEBPACK_IMPORTED_MODULE_2__["Token"].parser(tokeniser, tokenName),
+    listName: tokenName + " list"
+  });
+}
+
+const extAttrValueSyntax = ["identifier", "decimal", "integer", "string"];
+
+const shouldBeLegacyPrefixed = [
+  "NoInterfaceObject",
+  "LenientSetter",
+  "LenientThis",
+  "TreatNonObjectAsNull",
+  "Unforgeable",
+];
+
+const renamedLegacies = new Map([
+  ...shouldBeLegacyPrefixed.map(name => [name, `Legacy${name}`]),
+  ["NamedConstructor", "LegacyFactoryFunction"],
+  ["OverrideBuiltins", "LegacyOverrideBuiltIns"],
+  ["TreatNullAs", "LegacyNullToEmptyString"],
+]);
+
+/**
+ * This will allow a set of extended attribute values to be parsed.
+ * @param {import("../tokeniser").Tokeniser} tokeniser
+ */
+function extAttrListItems(tokeniser) {
+  for (const syntax of extAttrValueSyntax) {
+    const toks = tokens(tokeniser, syntax);
+    if (toks.length) {
+      return toks;
+    }
+  }
+  tokeniser.error(`Expected identifiers, strings, decimals, or integers but none found`);
+}
+
+
+class ExtendedAttributeParameters extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
+  /**
+   * @param {import("../tokeniser").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const tokens = { assign: tokeniser.consume("=") };
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["autoParenter"])(new ExtendedAttributeParameters({ source: tokeniser.source, tokens }));
+    if (tokens.assign) {
+      tokens.secondaryName = tokeniser.consume(...extAttrValueSyntax);
+    }
+    tokens.open = tokeniser.consume("(");
+    if (tokens.open) {
+      ret.list = ret.rhsIsList ?
+        // [Exposed=(Window,Worker)]
+        extAttrListItems(tokeniser) :
+        // [LegacyFactoryFunction=Audio(DOMString src)] or [Constructor(DOMString str)]
+        Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["argument_list"])(tokeniser);
+      tokens.close = tokeniser.consume(")") || tokeniser.error("Unexpected token in extended attribute argument list");
+    } else if (ret.hasRhs && !tokens.secondaryName) {
+      tokeniser.error("No right hand side to extended attribute assignment");
+    }
+    return ret.this;
+  }
+
+  get rhsIsList() {
+    return this.tokens.assign && !this.tokens.secondaryName;
+  }
+
+  get rhsType() {
+    if (this.rhsIsList) {
+      return this.list[0].tokens.value.type + "-list";
+    }
+    if (this.tokens.secondaryName) {
+      return this.tokens.secondaryName.type;
+    }
+    return null;
+  }
+}
+
+class SimpleExtendedAttribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
+  /**
+   * @param {import("../tokeniser").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const name = tokeniser.consume("identifier");
+    if (name) {
+      return new SimpleExtendedAttribute({
+        source: tokeniser.source,
+        tokens: { name },
+        params: ExtendedAttributeParameters.parse(tokeniser)
+      });
+    }
+  }
+
+  constructor({ source, tokens, params }) {
+    super({ source, tokens });
+    params.parent = this;
+    Object.defineProperty(this, "params", { value: params });
+  }
+
+  get type() {
+    return "extended-attribute";
+  }
+  get name() {
+    return this.tokens.name.value;
+  }
+  get rhs() {
+    const { rhsType: type, tokens, list } = this.params;
+    if (!type) {
+      return null;
+    }
+    const value = this.params.rhsIsList ? list : Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["unescape"])(tokens.secondaryName.value);
+    return { type, value };
+  }
+  get arguments() {
+    const { rhsIsList, list } = this.params;
+    if (!list || rhsIsList) {
+      return [];
+    }
+    return list;
+  }
+
+  *validate(defs) {
+    const { name } = this;
+    if (name === "LegacyNoInterfaceObject") {
+      const message = `\`[LegacyNoInterfaceObject]\` extended attribute is an \
+undesirable feature that may be removed from Web IDL in the future. Refer to the \
+[relevant upstream PR](https://github.com/heycam/webidl/pull/609) for more \
+information.`;
+      yield Object(_error_js__WEBPACK_IMPORTED_MODULE_4__["validationError"])(this.tokens.name, this, "no-nointerfaceobject", message, { level: "warning" });
+    } else if (renamedLegacies.has(name)) {
+      const message = `\`[${name}]\` extended attribute is a legacy feature \
+that is now renamed to \`[${renamedLegacies.get(name)}]\`. Refer to the \
+[relevant upstream PR](https://github.com/heycam/webidl/pull/870) for more \
+information.`;
+      yield Object(_error_js__WEBPACK_IMPORTED_MODULE_4__["validationError"])(this.tokens.name, this, "renamed-legacy", message, {
+        level: "warning",
+        autofix: renameLegacyExtendedAttribute(this)
+      });
+    }
+    for (const arg of this.arguments) {
+      yield* arg.validate(defs);
+    }
+  }
+}
+
+/**
+ * @param {SimpleExtendedAttribute} extAttr
+ */
+function renameLegacyExtendedAttribute(extAttr) {
+  return () => {
+    const { name } = extAttr;
+    extAttr.tokens.name.value = renamedLegacies.get(name);
+    if (name === "TreatNullAs") {
+      extAttr.params.tokens = {};
+    }
+  };
+}
+
+// Note: we parse something simpler than the official syntax. It's all that ever
+// seems to be used
+class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__["ArrayBase"] {
+  /**
+   * @param {import("../tokeniser").Tokeniser} tokeniser
+   */
+  static parse(tokeniser) {
+    const tokens = {};
+    tokens.open = tokeniser.consume("[");
+    if (!tokens.open) return new ExtendedAttributes({});
+    const ret = new ExtendedAttributes({ source: tokeniser.source, tokens });
+    ret.push(...Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["list"])(tokeniser, {
+      parser: SimpleExtendedAttribute.parse,
+      listName: "extended attribute"
+    }));
+    tokens.close = tokeniser.consume("]") || tokeniser.error("Unexpected closing token of extended attribute");
+    if (!ret.length) {
+      tokeniser.error("Found an empty extended attribute");
+    }
+    if (tokeniser.probe("[")) {
+      tokeniser.error("Illegal double extended attribute lists, consider merging them");
+    }
+    return ret;
+  }
+
+  *validate(defs) {
+    for (const extAttr of this) {
+      yield* extAttr.validate(defs);
+    }
+  }
+}
+
+
+/***/ }),
+/* 9 */
+/***/ (function(module, __webpack_exports__, __webpack_require__) {
+
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "ArrayBase", function() { return ArrayBase; });
+// @ts-check
+
+class ArrayBase extends Array {
+  constructor({ source, tokens }) {
+    super();
+    Object.defineProperties(this, {
+      source: { value: source },
+      tokens: { value: tokens },
+      parent: { value: null, writable: true }
+    });
+  }
+}
+
+
+/***/ }),
+/* 10 */
+/***/ (function(module, __webpack_exports__, __webpack_require__) {
+
+"use strict";
+__webpack_require__.r(__webpack_exports__);
+/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Token", function() { return Token; });
+/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
+/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+// @ts-check
+
+
+
+
+class Token extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
+  /**
+   * @param {import("../tokeniser").Tokeniser} tokeniser
+   * @param {string} type
+   */
+  static parser(tokeniser, type) {
+    return () => {
+      const value = tokeniser.consume(type);
+      if (value) {
+        return new Token({ source: tokeniser.source, tokens: { value } });
+      }
+    };
+  }
+
+  get value() {
+    return Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["unescape"])(this.tokens.value.value);
+  }
+}
+
+
+/***/ }),
+/* 11 */
+/***/ (function(module, __webpack_exports__, __webpack_require__) {
+
 "use strict";
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Argument", function() { return Argument; });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
-/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(9);
-/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(10);
+/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(12);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(4);
 /* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_4__ = __webpack_require__(2);
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_5__ = __webpack_require__(3);
 /* harmony import */ var _validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__ = __webpack_require__(7);
+// @ts-check
+
 
 
 
@@ -1156,8 +1568,9 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
    */
   static parse(tokeniser) {
     const start_position = tokeniser.position;
+    /** @type {Base["tokens"]} */
     const tokens = {};
-    const ret = new Argument({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["autoParenter"])(new Argument({ source: tokeniser.source, tokens }));
     ret.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__["ExtendedAttributes"].parse(tokeniser);
     tokens.optional = tokeniser.consume("optional");
     ret.idlType = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["type_with_extended_attributes"])(tokeniser, "argument-type");
@@ -1172,7 +1585,7 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
       return tokeniser.unconsume(start_position);
     }
     ret.default = tokens.optional ? _default_js__WEBPACK_IMPORTED_MODULE_1__["Default"].parse(tokeniser) : null;
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1188,13 +1601,24 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     return Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["unescape"])(this.tokens.name.value);
   }
 
+  /**
+   * @param {import("../validator.js").Definitions} defs
+   */
   *validate(defs) {
     yield* this.idlType.validate(defs);
-    if (Object(_validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__["idlTypeIncludesDictionary"])(this.idlType, defs, { useNullableInner: true })) {
+    const result = Object(_validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__["idlTypeIncludesDictionary"])(this.idlType, defs, { useNullableInner: true });
+    if (result) {
       if (this.idlType.nullable) {
         const message = `Dictionary arguments cannot be nullable.`;
         yield Object(_error_js__WEBPACK_IMPORTED_MODULE_5__["validationError"])(this.tokens.name, this, "no-nullable-dict-arg", message);
-      } else if (this.optional && !this.default) {
+      } else if (!this.optional) {
+        if (this.parent && !Object(_validators_helpers_js__WEBPACK_IMPORTED_MODULE_6__["dictionaryIncludesRequiredField"])(result.dictionary, defs) && isLastRequiredArgument(this)) {
+          const message = `Dictionary argument must be optional if it has no required fields`;
+          yield Object(_error_js__WEBPACK_IMPORTED_MODULE_5__["validationError"])(this.tokens.name, this, "dict-arg-optional", message, {
+            autofix: autofixDictionaryArgumentOptionality(this)
+          });
+        }
+      } else if (!this.default) {
         const message = `Optional dictionary arguments must have a default value of \`{}\`.`;
         yield Object(_error_js__WEBPACK_IMPORTED_MODULE_5__["validationError"])(this.tokens.name, this, "dict-arg-default", message, {
           autofix: autofixOptionalDictionaryDefaultValue(this)
@@ -1204,6 +1628,28 @@ class Argument extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   }
 }
 
+/**
+ * @param {Argument} arg
+ */
+function isLastRequiredArgument(arg) {
+  const list = arg.parent.arguments || arg.parent.list;
+  const index = list.indexOf(arg);
+  const requiredExists = list.slice(index + 1).some(a => !a.optional);
+  return !requiredExists;
+}
+
+/**
+ * @param {Argument} arg
+ */
+function autofixDictionaryArgumentOptionality(arg) {
+  return () => {
+    const firstToken = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_3__["getFirstToken"])(arg.idlType);
+    arg.tokens.optional = { type: "optional", value: "optional", trivia: firstToken.trivia };
+    firstToken.trivia = " ";
+    autofixOptionalDictionaryDefaultValue(arg)();
+  };
+}
+
 /**
  * @param {Argument} arg
  */
@@ -1215,7 +1661,7 @@ function autofixOptionalDictionaryDefaultValue(arg) {
 
 
 /***/ }),
-/* 9 */
+/* 12 */
 /***/ (function(module, __webpack_exports__, __webpack_require__) {
 
 "use strict";
@@ -1249,6 +1695,7 @@ class Default extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 
   constructor({ source, tokens, expression }) {
     super({ source, tokens });
+    expression.parent = this;
     Object.defineProperty(this, "expression", { value: expression });
   }
 
@@ -1264,191 +1711,6 @@ class Default extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 }
 
 
-/***/ }),
-/* 10 */
-/***/ (function(module, __webpack_exports__, __webpack_require__) {
-
-"use strict";
-__webpack_require__.r(__webpack_exports__);
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "SimpleExtendedAttribute", function() { return SimpleExtendedAttribute; });
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "ExtendedAttributes", function() { return ExtendedAttributes; });
-/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
-/* harmony import */ var _array_base_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(11);
-/* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(4);
-/* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(3);
-
-
-
-
-
-class ExtendedAttributeParameters extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
-  /**
-   * @param {import("../tokeniser").Tokeniser} tokeniser
-   */
-  static parse(tokeniser) {
-    const tokens = { assign: tokeniser.consume("=") };
-    const ret = new ExtendedAttributeParameters({ source: tokeniser.source, tokens });
-    if (tokens.assign) {
-      tokens.secondaryName = tokeniser.consume("identifier", "decimal", "integer", "string");
-    }
-    tokens.open = tokeniser.consume("(");
-    if (tokens.open) {
-      ret.list = ret.rhsType === "identifier-list" ?
-        // [Exposed=(Window,Worker)]
-        Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["identifiers"])(tokeniser) :
-        // [NamedConstructor=Audio(DOMString src)] or [Constructor(DOMString str)]
-        Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["argument_list"])(tokeniser);
-      tokens.close = tokeniser.consume(")") || tokeniser.error("Unexpected token in extended attribute argument list");
-    } else if (ret.hasRhs && !tokens.secondaryName) {
-      tokeniser.error("No right hand side to extended attribute assignment");
-    }
-    return ret;
-  }
-
-  get rhsType() {
-    return !this.tokens.assign ? null :
-      !this.tokens.secondaryName ? "identifier-list" :
-        this.tokens.secondaryName.type;
-  }
-}
-
-class SimpleExtendedAttribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
-  /**
-   * @param {import("../tokeniser").Tokeniser} tokeniser
-   */
-  static parse(tokeniser) {
-    const name = tokeniser.consume("identifier");
-    if (name) {
-      return new SimpleExtendedAttribute({
-        source: tokeniser.source,
-        tokens: { name },
-        params: ExtendedAttributeParameters.parse(tokeniser)
-      });
-    }
-  }
-
-  constructor({ source, tokens, params }) {
-    super({ source, tokens });
-    Object.defineProperty(this, "params", { value: params });
-  }
-
-  get type() {
-    return "extended-attribute";
-  }
-  get name() {
-    return this.tokens.name.value;
-  }
-  get rhs() {
-    const { rhsType: type, tokens, list } = this.params;
-    if (!type) {
-      return null;
-    }
-    const value = type === "identifier-list" ? list : tokens.secondaryName.value;
-    return { type, value };
-  }
-  get arguments() {
-    const { rhsType, list } = this.params;
-    if (!list || rhsType === "identifier-list") {
-      return [];
-    }
-    return list;
-  }
-
-  *validate(defs) {
-    if (this.name === "NoInterfaceObject") {
-      const message = `\`[NoInterfaceObject]\` extended attribute is an \
-undesirable feature that may be removed from Web IDL in the future. Refer to the \
-[relevant upstream PR](https://github.com/heycam/webidl/pull/609) for more \
-information.`;
-      yield Object(_error_js__WEBPACK_IMPORTED_MODULE_3__["validationError"])(this.tokens.name, this, "no-nointerfaceobject", message, { level: "warning" });
-    }
-    for (const arg of this.arguments) {
-      yield* arg.validate(defs);
-    }
-  }
-}
-
-// Note: we parse something simpler than the official syntax. It's all that ever
-// seems to be used
-class ExtendedAttributes extends _array_base_js__WEBPACK_IMPORTED_MODULE_1__["ArrayBase"] {
-  /**
-   * @param {import("../tokeniser").Tokeniser} tokeniser
-   */
-  static parse(tokeniser) {
-    const tokens = {};
-    tokens.open = tokeniser.consume("[");
-    if (!tokens.open) return new ExtendedAttributes({});
-    const ret = new ExtendedAttributes({ source: tokeniser.source, tokens });
-    ret.push(...Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["list"])(tokeniser, {
-      parser: SimpleExtendedAttribute.parse,
-      listName: "extended attribute"
-    }));
-    tokens.close = tokeniser.consume("]") || tokeniser.error("Unexpected closing token of extended attribute");
-    if (!ret.length) {
-      tokeniser.error("Found an empty extended attribute");
-    }
-    if (tokeniser.probe("[")) {
-      tokeniser.error("Illegal double extended attribute lists, consider merging them");
-    }
-    return ret;
-  }
-
-  *validate(defs) {
-    for (const extAttr of this) {
-      yield* extAttr.validate(defs);
-    }
-  }
-}
-
-
-/***/ }),
-/* 11 */
-/***/ (function(module, __webpack_exports__, __webpack_require__) {
-
-"use strict";
-__webpack_require__.r(__webpack_exports__);
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "ArrayBase", function() { return ArrayBase; });
-class ArrayBase extends Array {
-  constructor({ source, tokens }) {
-    super();
-    Object.defineProperties(this, {
-      source: { value: source },
-      tokens: { value: tokens }
-    });
-  }
-}
-
-
-/***/ }),
-/* 12 */
-/***/ (function(module, __webpack_exports__, __webpack_require__) {
-
-"use strict";
-__webpack_require__.r(__webpack_exports__);
-/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Token", function() { return Token; });
-/* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
-
-
-class Token extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
-  /**
-   * @param {import("../tokeniser").Tokeniser} tokeniser
-   * @param {string} type
-   */
-  static parser(tokeniser, type) {
-    return () => {
-      const value = tokeniser.consume(type);
-      if (value) {
-        return new Token({ source: tokeniser.source, tokens: { value } });
-      }
-    };
-  }
-
-  get value() {
-    return this.tokens.value.value;
-  }
-}
-
-
 /***/ }),
 /* 13 */
 /***/ (function(module, __webpack_exports__, __webpack_require__) {
@@ -1465,11 +1727,16 @@ __webpack_require__.r(__webpack_exports__);
 
 class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   /**
+   * @typedef {import("../tokeniser.js").Token} Token
+   *
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {Token} [options.special]
+   * @param {Token} [options.regular]
    */
   static parse(tokeniser, { special, regular } = {}) {
     const tokens = { special };
-    const ret = new Operation({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Operation({ source: tokeniser.source, tokens }));
     if (special && special.value === "stringifier") {
       tokens.termination = tokeniser.consume(";");
       if (tokens.termination) {
@@ -1486,7 +1753,7 @@ class Operation extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     ret.arguments = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["argument_list"])(tokeniser);
     tokens.close = tokeniser.consume(")") || tokeniser.error("Unterminated operation");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated operation, expected `;`");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1540,7 +1807,7 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   static parse(tokeniser, { special, noInherit = false, readonly = false } = {}) {
     const start_position = tokeniser.position;
     const tokens = { special };
-    const ret = new Attribute({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Attribute({ source: tokeniser.source, tokens }));
     if (!special && !noInherit) {
       tokens.special = tokeniser.consume("inherit");
     }
@@ -1563,7 +1830,7 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     }
     tokens.name = tokeniser.consume("identifier", "async", "required") || tokeniser.error("Attribute lacks a name");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated attribute, expected `;`");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1583,6 +1850,7 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   }
 
   *validate(defs) {
+    yield* this.extAttrs.validate(defs);
     yield* this.idlType.validate(defs);
   }
 }
@@ -1596,7 +1864,7 @@ class Attribute extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Enum", function() { return Enum; });
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(4);
-/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(12);
+/* harmony import */ var _token_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(10);
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(6);
 
 
@@ -1626,13 +1894,15 @@ class Enum extends _base_js__WEBPACK_IMPORTED_MODULE_2__["Base"] {
    * @param {import("../tokeniser").Tokeniser} tokeniser
    */
   static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
     const tokens = {};
     tokens.base = tokeniser.consume("enum");
     if (!tokens.base) {
       return;
     }
     tokens.name = tokeniser.consume("identifier") || tokeniser.error("No name for enum");
-    const ret = tokeniser.current = new Enum({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_0__["autoParenter"])(new Enum({ source: tokeniser.source, tokens }));
+    tokeniser.current = ret.this;
     tokens.open = tokeniser.consume("{") || tokeniser.error("Bodyless enum");
     ret.values = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_0__["list"])(tokeniser, {
       parser: EnumValue.parse,
@@ -1647,7 +1917,7 @@ class Enum extends _base_js__WEBPACK_IMPORTED_MODULE_2__["Base"] {
       tokeniser.error("No value in enum");
     }
     tokens.termination = tokeniser.consume(";") || tokeniser.error("No semicolon after enum");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1668,6 +1938,8 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Includes", function() { return Includes; });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
+// @ts-check
+
 
 
 
@@ -1720,17 +1992,18 @@ class Typedef extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
    * @param {import("../tokeniser").Tokeniser} tokeniser
    */
   static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
     const tokens = {};
-    const ret = new Typedef({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Typedef({ source: tokeniser.source, tokens }));
     tokens.base = tokeniser.consume("typedef");
     if (!tokens.base) {
       return;
     }
     ret.idlType = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["type_with_extended_attributes"])(tokeniser, "typedef-type") || tokeniser.error("Typedef lacks a type");
     tokens.name = tokeniser.consume("identifier") || tokeniser.error("Typedef lacks a name");
-    tokeniser.current = ret;
+    tokeniser.current = ret.this;
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated typedef, expected `;`");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1764,16 +2037,16 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
    */
   static parse(tokeniser, base) {
     const tokens = { base };
-    const ret = new CallbackFunction({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new CallbackFunction({ source: tokeniser.source, tokens }));
     tokens.name = tokeniser.consume("identifier") || tokeniser.error("Callback lacks a name");
-    tokeniser.current = ret;
+    tokeniser.current = ret.this;
     tokens.assign = tokeniser.consume("=") || tokeniser.error("Callback lacks an assignment");
     ret.idlType = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["return_type"])(tokeniser) || tokeniser.error("Callback lacks a return type");
     tokens.open = tokeniser.consume("(") || tokeniser.error("Callback lacks parentheses for arguments");
     ret.arguments = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["argument_list"])(tokeniser);
     tokens.close = tokeniser.consume(")") || tokeniser.error("Unterminated callback");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated callback, expected `;`");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -1784,6 +2057,7 @@ class CallbackFunction extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   }
 
   *validate(defs) {
+    yield* this.extAttrs.validate(defs);
     yield* this.idlType.validate(defs);
   }
 }
@@ -1806,6 +2080,8 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _validators_interface_js__WEBPACK_IMPORTED_MODULE_7__ = __webpack_require__(23);
 /* harmony import */ var _constructor_js__WEBPACK_IMPORTED_MODULE_8__ = __webpack_require__(24);
 /* harmony import */ var _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__ = __webpack_require__(2);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_10__ = __webpack_require__(8);
+
 
 
 
@@ -1859,7 +2135,7 @@ class Interface extends _container_js__WEBPACK_IMPORTED_MODULE_0__["Container"]
     if (
       !this.partial &&
       this.extAttrs.every(extAttr => extAttr.name !== "Exposed") &&
-      this.extAttrs.every(extAttr => extAttr.name !== "NoInterfaceObject")
+      this.extAttrs.every(extAttr => extAttr.name !== "LegacyNoInterfaceObject")
     ) {
       const message = `Interfaces must have \`[Exposed]\` extended attribute. \
 To fix, add, for example, \`[Exposed=Window]\`. Please also consider carefully \
@@ -1870,8 +2146,8 @@ for more information.`;
         autofix: Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["autofixAddExposedWindow"])(this)
       });
     }
-    const constructors = this.extAttrs.filter(extAttr => extAttr.name === "Constructor");
-    for (const constructor of constructors) {
+    const oldConstructors = this.extAttrs.filter(extAttr => extAttr.name === "Constructor");
+    for (const constructor of oldConstructors) {
       const message = `Constructors should now be represented as a \`constructor()\` operation on the interface \
 instead of \`[Constructor]\` extended attribute. Refer to the \
 [WebIDL spec section on constructor operations](https://heycam.github.io/webidl/#idl-constructors) \
@@ -1881,6 +2157,21 @@ for more information.`;
       });
     }
 
+    const isGlobal = this.extAttrs.some(extAttr => extAttr.name === "Global");
+    if (isGlobal) {
+      const factoryFunctions = this.extAttrs.filter(extAttr => extAttr.name === "LegacyFactoryFunction");
+      for (const named of factoryFunctions) {
+        const message = `Interfaces marked as \`[Global]\` cannot have factory functions.`;
+        yield Object(_error_js__WEBPACK_IMPORTED_MODULE_6__["validationError"])(named.tokens.name, this, "no-constructible-global", message);
+      }
+
+      const constructors = this.members.filter(member => member.type === "constructor");
+      for (const named of constructors) {
+        const message = `Interfaces marked as \`[Global]\` cannot have constructors.`;
+        yield Object(_error_js__WEBPACK_IMPORTED_MODULE_6__["validationError"])(named.tokens.base, this, "no-constructible-global", message);
+      }
+    }
+
     yield* super.validate(defs);
     if (!this.partial) {
       yield* Object(_validators_interface_js__WEBPACK_IMPORTED_MODULE_7__["checkInterfaceMemberDuplication"])(defs, this);
@@ -1889,16 +2180,17 @@ for more information.`;
 }
 
 function autofixConstructor(interfaceDef, constructorExtAttr) {
+  interfaceDef = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["autoParenter"])(interfaceDef);
   return () => {
     const indentation = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["getLastIndentation"])(interfaceDef.extAttrs.tokens.open.trivia);
     const memberIndent = interfaceDef.members.length ?
       Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["getLastIndentation"])(Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["getFirstToken"])(interfaceDef.members[0]).trivia) :
       Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["getMemberIndentation"])(indentation);
     const constructorOp = _constructor_js__WEBPACK_IMPORTED_MODULE_8__["Constructor"].parse(new _tokeniser_js__WEBPACK_IMPORTED_MODULE_9__["Tokeniser"](`\n${memberIndent}constructor();`));
-    constructorOp.extAttrs = [];
-    constructorOp.arguments = constructorExtAttr.arguments;
+    constructorOp.extAttrs = new _extended_attributes_js__WEBPACK_IMPORTED_MODULE_10__["ExtendedAttributes"]({});
+    Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["autoParenter"])(constructorOp).arguments = constructorExtAttr.arguments;
 
-    const existingIndex = interfaceDef.members.findIndex(m => m.type === "constructor");
+    const existingIndex = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_5__["findLastIndex"])(interfaceDef.members, m => m.type === "constructor");
     interfaceDef.members.splice(existingIndex + 1, 0, constructorOp);
 
     const { close }  = interfaceDef.tokens;
@@ -1928,7 +2220,7 @@ function autofixConstructor(interfaceDef, constructorExtAttr) {
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Container", function() { return Container; });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
-/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(10);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(8);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(4);
 
 
@@ -1948,14 +2240,16 @@ function inheritance(tokeniser) {
 
 class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     /**
+     * @template T
      * @param {import("../tokeniser.js").Tokeniser} tokeniser
-     * @param {*} instance
+     * @param {T} instance
      * @param {*} args
      */
     static parse(tokeniser, instance, { type, inheritable, allowedMembers }) {
       const { tokens } = instance;
       tokens.name = tokeniser.consume("identifier") || tokeniser.error(`Missing name in ${instance.type}`);
       tokeniser.current = instance;
+      instance = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["autoParenter"])(instance);
       if (inheritable) {
         Object.assign(tokens, inheritance(tokeniser));
       }
@@ -1965,12 +2259,12 @@ class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
         tokens.close = tokeniser.consume("}");
         if (tokens.close) {
           tokens.termination = tokeniser.consume(";") || tokeniser.error(`Missing semicolon after ${type}`);
-          return instance;
+          return instance.this;
         }
         const ea = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_1__["ExtendedAttributes"].parse(tokeniser);
         let mem;
         for (const [parser, ...args] of allowedMembers) {
-          mem = parser(tokeniser, ...args);
+          mem = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["autoParenter"])(parser(tokeniser, ...args));
           if (mem) {
             break;
           }
@@ -1979,7 +2273,7 @@ class Container extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
           tokeniser.error("Unknown member");
         }
         mem.extAttrs = ea;
-        instance.members.push(mem);
+        instance.members.push(mem.this);
       }
     }
 
@@ -2025,6 +2319,7 @@ class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
    * @param {import("../tokeniser.js").Tokeniser} tokeniser
    */
   static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
     const tokens = {};
     tokens.base = tokeniser.consume("const");
     if (!tokens.base) {
@@ -2044,7 +2339,7 @@ class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     tokens.value = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["const_value"])(tokeniser) || tokeniser.error("Const lacks a value");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated const, expected `;`");
     const ret = new Constant({ source: tokeniser.source, tokens });
-    ret.idlType = idlType;
+    Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["autoParenter"])(ret).idlType = idlType;
     return ret;
   }
 
@@ -2052,7 +2347,7 @@ class Constant extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     return "const";
   }
   get name() {
-    return unescape(this.tokens.name.value);
+    return Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["unescape"])(this.tokens.name.value);
   }
   get value() {
     return Object(_helpers_js__WEBPACK_IMPORTED_MODULE_2__["const_data"])(this.tokens.value);
@@ -2079,7 +2374,7 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   static parse(tokeniser) {
     const start_position = tokeniser.position;
     const tokens = {};
-    const ret = new IterableLike({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new IterableLike({ source: tokeniser.source, tokens }));
     tokens.readonly = tokeniser.consume("readonly");
     if (!tokens.readonly) {
       tokens.async = tokeniser.consume("async");
@@ -2094,12 +2389,15 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     }
 
     const { type } = ret;
-    const secondTypeRequired = type === "maplike" || ret.async;
+    const secondTypeRequired = type === "maplike";
     const secondTypeAllowed = secondTypeRequired || type === "iterable";
+    const argumentAllowed = ret.async && type === "iterable";
 
     tokens.open = tokeniser.consume("<") || tokeniser.error(`Missing less-than sign \`<\` in ${type} declaration`);
     const first = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["type_with_extended_attributes"])(tokeniser) || tokeniser.error(`Missing a type argument in ${type} declaration`);
     ret.idlType = [first];
+    ret.arguments = [];
+
     if (secondTypeAllowed) {
       first.tokens.separator = tokeniser.consume(",");
       if (first.tokens.separator) {
@@ -2109,10 +2407,22 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
         tokeniser.error(`Missing second type argument in ${type} declaration`);
       }
     }
+
     tokens.close = tokeniser.consume(">") || tokeniser.error(`Missing greater-than sign \`>\` in ${type} declaration`);
+
+    if (tokeniser.probe("(")) {
+      if (argumentAllowed) {
+        tokens.argsOpen = tokeniser.consume("(");
+        ret.arguments.push(...Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["argument_list"])(tokeniser));
+        tokens.argsClose = tokeniser.consume(")") || tokeniser.error("Unterminated async iterable argument list");
+      } else {
+        tokeniser.error(`Arguments are only allowed for \`async iterable\``);
+      }
+    }
+
     tokens.termination = tokeniser.consume(";") || tokeniser.error(`Missing semicolon after ${type} declaration`);
 
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -2124,6 +2434,15 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
   get async() {
     return !!this.tokens.async;
   }
+
+  *validate(defs) {
+    for (const type of this.idlType) {
+      yield* type.validate(defs);
+    }
+    for (const argument of this.arguments) {
+      yield* argument.validate(defs);
+    }
+  }
 }
 
 
@@ -2135,6 +2454,8 @@ class IterableLike extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
 __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "checkInterfaceMemberDuplication", function() { return checkInterfaceMemberDuplication; });
 /* harmony import */ var _error_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(3);
+// @ts-check
+
 
 
 function* checkInterfaceMemberDuplication(defs, i) {
@@ -2187,13 +2508,14 @@ class Constructor extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     if (!base) {
       return;
     }
+    /** @type {Base["tokens"]} */
     const tokens = { base };
     tokens.open = tokeniser.consume("(") || tokeniser.error("No argument list in constructor");
     const args = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["argument_list"])(tokeniser);
     tokens.close = tokeniser.consume(")") || tokeniser.error("Unterminated constructor");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("No semicolon after constructor");
-    const ret = new Constructor({ tokens });
-    ret.arguments = args;
+    const ret = new Constructor({ source: tokeniser.source, tokens });
+    Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(ret).arguments = args;
     return ret;
   }
 
@@ -2232,7 +2554,12 @@ __webpack_require__.r(__webpack_exports__);
 
 class Mixin extends _container_js__WEBPACK_IMPORTED_MODULE_0__["Container"] {
   /**
-   * @param {import("../tokeniser").Tokeniser} tokeniser
+   * @typedef {import("../tokeniser.js").Token} Token
+   *
+   * @param {import("../tokeniser.js").Tokeniser} tokeniser
+   * @param {Token} base
+   * @param {object} [options]
+   * @param {Token} [options.partial]
    */
   static parse(tokeniser, base, { partial } = {}) {
     const tokens = { partial, base };
@@ -2266,12 +2593,16 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Dictionary", function() { return Dictionary; });
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _field_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(27);
+// @ts-check
+
 
 
 
 class Dictionary extends _container_js__WEBPACK_IMPORTED_MODULE_0__["Container"] {
   /**
    * @param {import("../tokeniser").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {import("../tokeniser.js").Token} [options.partial]
    */
   static parse(tokeniser, { partial } = {}) {
     const tokens = { partial };
@@ -2303,8 +2634,8 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "Field", function() { return Field; });
 /* harmony import */ var _base_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(6);
 /* harmony import */ var _helpers_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(4);
-/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(10);
-/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(9);
+/* harmony import */ var _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(8);
+/* harmony import */ var _default_js__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(12);
 
 
 
@@ -2315,8 +2646,9 @@ class Field extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
    * @param {import("../tokeniser").Tokeniser} tokeniser
    */
   static parse(tokeniser) {
+    /** @type {Base["tokens"]} */
     const tokens = {};
-    const ret = new Field({ source: tokeniser.source, tokens });
+    const ret = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["autoParenter"])(new Field({ source: tokeniser.source, tokens }));
     ret.extAttrs = _extended_attributes_js__WEBPACK_IMPORTED_MODULE_2__["ExtendedAttributes"].parse(tokeniser);
     tokens.required = tokeniser.consume("required");
     ret.idlType = Object(_helpers_js__WEBPACK_IMPORTED_MODULE_1__["type_with_extended_attributes"])(tokeniser, "dictionary-type") || tokeniser.error("Dictionary member lacks a type");
@@ -2324,7 +2656,7 @@ class Field extends _base_js__WEBPACK_IMPORTED_MODULE_0__["Base"] {
     ret.default = _default_js__WEBPACK_IMPORTED_MODULE_3__["Default"].parse(tokeniser);
     if (tokens.required && ret.default) tokeniser.error("Required member must not have a default");
     tokens.termination = tokeniser.consume(";") || tokeniser.error("Unterminated dictionary member, expected `;`");
-    return ret;
+    return ret.this;
   }
 
   get type() {
@@ -2364,6 +2696,8 @@ __webpack_require__.r(__webpack_exports__);
 class Namespace extends _container_js__WEBPACK_IMPORTED_MODULE_0__["Container"] {
   /**
    * @param {import("../tokeniser").Tokeniser} tokeniser
+   * @param {object} [options]
+   * @param {import("../tokeniser.js").Token} [options.partial]
    */
   static parse(tokeniser, { partial } = {}) {
     const tokens = { partial };
@@ -2410,6 +2744,7 @@ __webpack_require__.r(__webpack_exports__);
 /* harmony import */ var _container_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(20);
 /* harmony import */ var _operation_js__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(13);
 /* harmony import */ var _constant_js__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(21);
+// @ts-check
 
 
 
@@ -2543,6 +2878,12 @@ function write(ast, { templates: ts = templates } = {}) {
       token(arg.tokens.separator)
     ]);
   }
+  function extended_attribute_listitem(str) {
+    return ts.wrap([
+      token(str.tokens.value),
+      token(str.tokens.separator)
+    ]);
+  }
   function identifier(id, context) {
     return ts.wrap([
       reference_token(id.tokens.value, context),
@@ -2560,7 +2901,9 @@ function write(ast, { templates: ts = templates } = {}) {
         token(it.params.tokens.open),
         ...!it.params.list ? [] :
           it.params.list.map(
-            rhsType === "identifier-list" ? id => identifier(id, it) : argument
+            rhsType === "identifier-list" ? id => identifier(id, it) :
+            rhsType && rhsType.endsWith("-list") ? extended_attribute_listitem :
+            argument
           ),
         token(it.params.tokens.close)
       ])),
@@ -2724,6 +3067,9 @@ function write(ast, { templates: ts = templates } = {}) {
       token(it.tokens.open),
       ts.wrap(it.idlType.map(type)),
       token(it.tokens.close),
+      token(it.tokens.argsOpen),
+      ts.wrap(it.arguments.map(argument)),
+      token(it.tokens.argsClose),
       token(it.tokens.termination)
     ]), { data: it, parent });
   }
@@ -2798,6 +3144,9 @@ function getMixinMap(all, unique) {
   return map;
 }
 
+/**
+ * @typedef {ReturnType<typeof groupDefinitions>} Definitions
+ */
 function groupDefinitions(all) {
   const unique = new Map();
   const duplicates = new Set();
@@ -2828,7 +3177,8 @@ function groupDefinitions(all) {
     duplicates,
     mixinMap: getMixinMap(all, unique),
     cache: {
-      typedefIncludesDictionary: new WeakMap()
+      typedefIncludesDictionary: new WeakMap(),
+      dictionaryIncludesRequiredField: new WeakMap()
     },
   };
 }
diff --git a/tests/wpt/web-platform-tests/shadow-dom/Slotable-interface.html b/tests/wpt/web-platform-tests/shadow-dom/Slottable-mixin.html
similarity index 98%
rename from tests/wpt/web-platform-tests/shadow-dom/Slotable-interface.html
rename to tests/wpt/web-platform-tests/shadow-dom/Slottable-mixin.html
index a7b97e80267..84c7fce4450 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/Slotable-interface.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/Slottable-mixin.html
@@ -1,9 +1,9 @@
 <!DOCTYPE html>
 <html>
 <head>
-<title>Shadow DOM: Slotable interface</title>
+<title>Shadow DOM: Slottable mixin</title>
 <meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
-<meta name="assert" content="Element and Text interfaces must implement Slotable interface">
+<meta name="assert" content="Element and Text interfaces must implement Slottable mixin">
 <link rel="help" href="https://dom.spec.whatwg.org/#slotable">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
diff --git a/tests/wpt/web-platform-tests/shadow-dom/slotchange-event.html b/tests/wpt/web-platform-tests/shadow-dom/slotchange-event.html
index 167d600a3bd..f1d06297ff6 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/slotchange-event.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/slotchange-event.html
@@ -243,7 +243,7 @@ testSlotchangeDoesNotFireWhenOtherSlotsChange('closed', false);
 
 function testSlotchangeDoesFireAtInsertedAndDoesNotFireForMutationAfterRemoved(mode, connectedToDocument)
 {
-    var test = async_test('slotchange event must fire on a slot element when a shadow host has a slotable and the slot was inserted'
+    var test = async_test('slotchange event must fire on a slot element when a shadow host has a slottable and the slot was inserted'
                         + ' and must not fire when the shadow host was mutated after the slot was removed inside '
                         + treeName(mode, connectedToDocument));
 
diff --git a/tests/wpt/web-platform-tests/shadow-dom/slots-imperative-slot-api.tentative.html b/tests/wpt/web-platform-tests/shadow-dom/slots-imperative-slot-api.tentative.html
index 6343886da03..02144640e12 100644
--- a/tests/wpt/web-platform-tests/shadow-dom/slots-imperative-slot-api.tentative.html
+++ b/tests/wpt/web-platform-tests/shadow-dom/slots-imperative-slot-api.tentative.html
@@ -53,7 +53,7 @@ test(() => {
   assert_throws_dom('NotAllowedError', () => { tTree.s2.assign([tTree.c2]); });
 
   assert_throws_dom('NotAllowedError', () => { tTree.s2.assign([tTree.host1]); });
-}, 'Imperative slot API throws exception when slotable parentNode != slot\'s host.');
+}, 'Imperative slot API throws exception when slottable parentNode != slot\'s host.');
 </script>
 
 <div id="test_assign">
@@ -112,7 +112,7 @@ test(() => {
   assert_equals(tTree.c1.assignedSlot, tTree.s1);
   assert_equals(tTree.c2.assignedSlot, tTree.s1);
   assert_equals(tTree.c3.assignedSlot, tTree.s1);
-}, 'Order of slotables is preserved in manual slot assignment.');
+}, 'Order of slottables is preserved in manual slot assignment.');
 
 test(() => {
   let tTree = createTestTree(test_assign);
@@ -134,7 +134,7 @@ test(() => {
   assert_equals(tTree.c1.assignedSlot, tTree.s1);
   assert_equals(tTree.c2.assignedSlot, tTree.s2);
   assert_equals(tTree.c3.assignedSlot, tTree.s3);
-}, 'Previously assigned slotable is moved to new slot when it\'s reassigned.');
+}, 'Previously assigned slottable is moved to new slot when it\'s reassigned.');
 
 test(() => {
  let tTree = createTestTree(test_assign);
@@ -192,7 +192,7 @@ test(() => {
 
   tTree.host4.append(tTree.s1);
   assert_array_equals(tTree.s1.assignedNodes(), []);
-}, 'Moving a slot to a new host, the slot loses its previously assigned slotables.');
+}, 'Moving a slot to a new host, the slot loses its previously assigned slottables.');
 
 test(() => {
   let tTree = createTestTree(test_assign);
@@ -210,7 +210,7 @@ test(() => {
 
   tTree.ns1.append(tTree.s1);
   assert_array_equals(tTree.s1.assignedNodes(), []);
-}, 'Moving a slot\'s tree order position within a shadow host has no impact on its assigned slotables.');
+}, 'Moving a slot\'s tree order position within a shadow host has no impact on its assigned slottables.');
 
 test(() => {
   let tTree = createTestTree(test_assign);
@@ -225,7 +225,7 @@ test(() => {
   tTree.s4.assign([tTree.c1]);
   assert_array_equals(tTree.s4.assignedNodes(), [tTree.c1]);
   assert_equals(tTree.c1.assignedSlot, tTree.s4);
-}, 'Appending slotable to different host, it loses slot assignment. It can be re-assigned within a new host.');
+}, 'Appending slottable to different host, it loses slot assignment. It can be re-assigned within a new host.');
 
 test(() => {
   let tTree = createTestTree(test_assign);
@@ -276,7 +276,7 @@ test(() => {
   assert_equals(tTree.c1.assignedSlot, null);
   assert_equals(tTree.c2.assignedSlot, null);
   assert_equals(tTree.c3.assignedSlot, null);
-}, 'Removing a slot from DOM resets its slotable\'s slot assignment.');
+}, 'Removing a slot from DOM resets its slottable\'s slot assignment.');
 
 test(() => {
   let tTree = createTestTree(test_assign);
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_cookies.py b/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_cookies.py
index 2e2d0d6771b..64eab2d806b 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_cookies.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_cookies.py
@@ -10,7 +10,7 @@ class TestResponseSetCookie(TestUsingServer):
     def test_name_value(self):
         @wptserve.handlers.handler
         def handler(request, response):
-            response.set_cookie("name", "value")
+            response.set_cookie(b"name", b"value")
             return "Test"
 
         route = ("GET", "/test/name_value", handler)
@@ -22,8 +22,8 @@ class TestResponseSetCookie(TestUsingServer):
     def test_unset(self):
         @wptserve.handlers.handler
         def handler(request, response):
-            response.set_cookie("name", "value")
-            response.unset_cookie("name")
+            response.set_cookie(b"name", b"value")
+            response.unset_cookie(b"name")
             return "Test"
 
         route = ("GET", "/test/unset", handler)
@@ -35,7 +35,7 @@ class TestResponseSetCookie(TestUsingServer):
     def test_delete(self):
         @wptserve.handlers.handler
         def handler(request, response):
-            response.delete_cookie("name")
+            response.delete_cookie(b"name")
             return "Test"
 
         route = ("GET", "/test/delete", handler)
@@ -47,18 +47,20 @@ class TestResponseSetCookie(TestUsingServer):
 
         self.assertEqual(parts["name"], "")
         self.assertEqual(parts["Path"], "/")
-        #Should also check that expires is in the past
+        # TODO: Should also check that expires is in the past
+
 
 class TestRequestCookies(TestUsingServer):
     def test_set_cookie(self):
         @wptserve.handlers.handler
         def handler(request, response):
-            return request.cookies["name"].value
+            return request.cookies[b"name"].value
 
         route = ("GET", "/test/set_cookie", handler)
         self.server.router.register(*route)
         resp = self.request(route[1], headers={"Cookie": "name=value"})
         self.assertEqual(resp.read(), b"value")
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_stash.py b/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_stash.py
index 309dd9e577a..1c4c9ad933a 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_stash.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/tests/functional/test_stash.py
@@ -18,10 +18,10 @@ class TestResponseSetCookie(TestUsingServer):
         @wptserve.handlers.handler
         def handler(request, response):
             if request.method == "POST":
-                request.server.stash.put(request.POST.first("id"), request.POST.first("data"))
+                request.server.stash.put(request.POST.first(b"id"), request.POST.first(b"data"))
                 data = "OK"
             elif request.method == "GET":
-                data = request.server.stash.take(request.GET.first("id"))
+                data = request.server.stash.take(request.GET.first(b"id"))
                 if data is None:
                     return "NOT FOUND"
             return data
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/pipes.py b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/pipes.py
index 569875bf972..bbf25e6fe11 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/pipes.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/pipes.py
@@ -320,6 +320,8 @@ class FirstWrapper(object):
 
     def __getitem__(self, key):
         try:
+            if isinstance(key, text_type):
+                key = key.encode('iso-8859-1')
             return self.params.first(key)
         except KeyError:
             return ""
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/request.py b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/request.py
index 89d52a9817e..7c4d02d6de6 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/request.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/request.py
@@ -1,13 +1,13 @@
 import base64
 import cgi
-from six.moves.http_cookies import BaseCookie
-from six import BytesIO, binary_type, text_type, iteritems, PY3
 import tempfile
 
+from six import BytesIO, binary_type, iteritems, PY3
+from six.moves.http_cookies import BaseCookie
 from six.moves.urllib.parse import parse_qsl, urlsplit
 
 from . import stash
-from .utils import HTTPException
+from .utils import HTTPException, isomorphic_encode, isomorphic_decode
 
 missing = object()
 
@@ -219,22 +219,23 @@ class Request(object):
     MultiDict representing the parameters supplied with the request.
     Note that these may be present on non-GET requests; the name is
     chosen to be familiar to users of other systems such as PHP.
+    Both keys and values are binary strings.
 
     .. attribute:: POST
 
     MultiDict representing the request body parameters. Most parameters
     are present as string values, but file uploads have file-like
-    values.
+    values. All string values (including keys) have binary type.
 
     .. attribute:: cookies
 
-    Cookies object representing cookies sent with the request with a
+    A Cookies object representing cookies sent with the request with a
     dictionary-like interface.
 
     .. attribute:: auth
 
-    Object with username and password properties representing any
-    credentials supplied using HTTP authentication.
+    An instance of Authentication with username and password properties
+    representing any credentials supplied using HTTP authentication.
 
     .. attribute:: server
 
@@ -296,7 +297,7 @@ class Request(object):
             params = parse_qsl(self.url_parts.query, keep_blank_values=True)
             self._GET = MultiDict()
             for key, value in params:
-                self._GET.add(key, value)
+                self._GET.add(isomorphic_encode(key), isomorphic_encode(value))
         return self._GET
 
     @property
@@ -305,11 +306,15 @@ class Request(object):
             # Work out the post parameters
             pos = self.raw_input.tell()
             self.raw_input.seek(0)
-            # FIXME: specify encoding in Python 3.
-            fs = cgi.FieldStorage(fp=self.raw_input,
-                                  environ={"REQUEST_METHOD": self.method},
-                                  headers=self.raw_headers,
-                                  keep_blank_values=True)
+            kwargs = {
+                "fp": self.raw_input,
+                "environ": {"REQUEST_METHOD": self.method},
+                "headers": self.raw_headers,
+                "keep_blank_values": True,
+            }
+            if PY3:
+                kwargs["encoding"] = "iso-8859-1"
+            fs = cgi.FieldStorage(**kwargs)
             self._POST = MultiDict.from_field_storage(fs)
             self.raw_input.seek(pos)
         return self._POST
@@ -317,14 +322,12 @@ class Request(object):
     @property
     def cookies(self):
         if self._cookies is None:
-            parser = BaseCookie()
+            parser = BinaryCookieParser()
             cookie_headers = self.headers.get("cookie", b"")
-            if PY3:
-                cookie_headers = cookie_headers.decode("iso-8859-1")
             parser.load(cookie_headers)
             cookies = Cookies()
             for key, value in iteritems(parser):
-                cookies[key] = CookieValue(value)
+                cookies[isomorphic_encode(key)] = CookieValue(value)
             self._cookies = cookies
         return self._cookies
 
@@ -357,24 +360,6 @@ class H2Request(Request):
         super(H2Request, self).__init__(request_handler)
 
 
-def _maybe_encode(s):
-    """Encodes a text-type string into binary data using iso-8859-1.
-
-    Returns `str` in Python 2 and `bytes` in Python 3. The function is a no-op
-    if the argument already has a binary type.
-    """
-    if isinstance(s, binary_type):
-        return s
-
-    # Python 3 assumes iso-8859-1 when parsing headers, which will garble text
-    # with non ASCII characters. We try to encode the text back to binary.
-    # https://github.com/python/cpython/blob/273fc220b25933e443c82af6888eb1871d032fb8/Lib/http/client.py#L213
-    if isinstance(s, text_type):
-        return s.encode("iso-8859-1")
-
-    raise TypeError("Unexpected value in RequestHeaders: %r" % s)
-
-
 class RequestHeaders(dict):
     """Read-only dictionary-like API for accessing request headers.
 
@@ -384,7 +369,7 @@ class RequestHeaders(dict):
     """
     def __init__(self, items):
         for header in items.keys():
-            key = _maybe_encode(header).lower()
+            key = isomorphic_encode(header).lower()
             # get all headers with the same name
             values = items.getallmatchingheaders(header)
             if len(values) > 1:
@@ -394,16 +379,16 @@ class RequestHeaders(dict):
                 for value in values:
                     # getallmatchingheaders returns raw header lines, so
                     # split to get name, value
-                    multiples.append(_maybe_encode(value).split(b':', 1)[1].strip())
+                    multiples.append(isomorphic_encode(value).split(b':', 1)[1].strip())
                 headers = multiples
             else:
-                headers = [_maybe_encode(items[header])]
+                headers = [isomorphic_encode(items[header])]
             dict.__setitem__(self, key, headers)
 
     def __getitem__(self, key):
         """Get all headers of a certain (case-insensitive) name. If there is
         more than one, the values are returned comma separated"""
-        key = _maybe_encode(key)
+        key = isomorphic_encode(key)
         values = dict.__getitem__(self, key.lower())
         if len(values) == 1:
             return values[0]
@@ -429,7 +414,7 @@ class RequestHeaders(dict):
     def get_list(self, key, default=missing):
         """Get all the header values for a particular field name as
         a list"""
-        key = _maybe_encode(key)
+        key = isomorphic_encode(key)
         try:
             return dict.__getitem__(self, key.lower())
         except KeyError:
@@ -439,7 +424,7 @@ class RequestHeaders(dict):
                 raise
 
     def __contains__(self, key):
-        key = _maybe_encode(key)
+        key = isomorphic_encode(key)
         return dict.__contains__(self, key.lower())
 
     def iteritems(self):
@@ -524,9 +509,8 @@ class CookieValue(object):
 
 
 class MultiDict(dict):
-    """Dictionary type that holds multiple values for each
-    key"""
-    #TODO: this should perhaps also order the keys
+    """Dictionary type that holds multiple values for each key"""
+    # TODO: this should perhaps also order the keys
     def __init__(self):
         pass
 
@@ -541,7 +525,6 @@ class MultiDict(dict):
 
     def __getitem__(self, key):
         """Get the first value with a given key"""
-        #TODO: should this instead be the last value?
         return self.first(key)
 
     def first(self, key, default=missing):
@@ -584,6 +567,10 @@ class MultiDict(dict):
 
     @classmethod
     def from_field_storage(cls, fs):
+        """Construct a MultiDict from a cgi.FieldStorage
+
+        Note that all keys and values are binary strings.
+        """
         self = cls()
         if fs.list is None:
             return self
@@ -594,13 +581,46 @@ class MultiDict(dict):
 
             for value in values:
                 if not value.filename:
-                    value = value.value
-                self.add(key, value)
+                    value = isomorphic_encode(value.value)
+                else:
+                    assert isinstance(value, cgi.FieldStorage)
+                self.add(isomorphic_encode(key), value)
         return self
 
 
+class BinaryCookieParser(BaseCookie):
+    """A subclass of BaseCookie that returns values in binary strings
+
+    This is not intended to store the cookies; use Cookies instead.
+    """
+    def value_decode(self, val):
+        """Decode value from network to (real_value, coded_value).
+
+        Override BaseCookie.value_decode.
+        """
+        return isomorphic_encode(val), val
+
+    def value_encode(self, val):
+        raise NotImplementedError('BinaryCookieParser is not for setting cookies')
+
+    def load(self, rawdata):
+        """Load cookies from a binary string.
+
+        This overrides and calls BaseCookie.load. Unlike BaseCookie.load, it
+        does not accept dictionaries.
+        """
+        assert isinstance(rawdata, binary_type)
+        if PY3:
+            # BaseCookie.load expects a native string, which in Python 3 is text.
+            rawdata = isomorphic_decode(rawdata)
+        super(BinaryCookieParser, self).load(rawdata)
+
+
 class Cookies(MultiDict):
-    """MultiDict specialised for Cookie values"""
+    """MultiDict specialised for Cookie values
+
+    Keys and values are binary strings.
+    """
     def __init__(self):
         pass
 
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 3a60c2babb3..f4009702f68 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/response.py
@@ -1,19 +1,22 @@
 from collections import OrderedDict
 from datetime import datetime, timedelta
-from six.moves.http_cookies import BaseCookie, Morsel
+from io import BytesIO
 import json
-import uuid
 import socket
+import uuid
+
+from hpack.struct import HeaderTuple
+from hyperframe.frame import HeadersFrame, DataFrame, ContinuationFrame
+from six import binary_type, text_type, integer_types, itervalues, PY3
+from six.moves.http_cookies import BaseCookie, Morsel
+
 from .constants import response_codes, h2_headers
 from .logger import get_logger
-from io import BytesIO
-
-from six import binary_type, text_type, integer_types, itervalues, PY3
-from hyperframe.frame import HeadersFrame, DataFrame, ContinuationFrame
-from hpack.struct import HeaderTuple
+from .utils import isomorphic_decode, isomorphic_encode
 
 missing = object()
 
+
 class Response(object):
     """Object representing the response to a HTTP request
 
@@ -79,7 +82,6 @@ class Response(object):
         self.headers = ResponseHeaders()
         self.content = []
 
-
     @property
     def status(self):
         return self._status
@@ -99,8 +101,8 @@ class Response(object):
         """Set a cookie to be sent with a Set-Cookie header in the
         response
 
-        :param name: String name of the cookie
-        :param value: String value of the cookie
+        :param name: name of the cookie (a binary string)
+        :param value: value of the cookie (a binary string, or None)
         :param max_age: datetime.timedelta int representing the time (in seconds)
                         until the cookie expires
         :param path: String path to which the cookie applies
@@ -113,14 +115,20 @@ class Response(object):
                         time or interval from now when the cookie expires
 
         """
+        # TODO(Python 3): Convert other parameters (e.g. path) to bytes, too.
+        if value is None:
+            value = b''
+            max_age = 0
+            expires = timedelta(days=-1)
+
+        if PY3:
+            name = isomorphic_decode(name)
+            value = isomorphic_decode(value)
+
         days = {i+1: name for i, name in enumerate(["jan", "feb", "mar",
                                                     "apr", "may", "jun",
                                                     "jul", "aug", "sep",
                                                     "oct", "nov", "dec"])}
-        if value is None:
-            value = ''
-            max_age = 0
-            expires = timedelta(days=-1)
 
         if isinstance(expires, timedelta):
             expires = datetime.utcnow() + expires
@@ -154,11 +162,14 @@ class Response(object):
 
     def unset_cookie(self, name):
         """Remove a cookie from those that are being sent with the response"""
+        if PY3:
+            name = isomorphic_decode(name)
         cookies = self.headers.get("Set-Cookie")
         parser = BaseCookie()
         for cookie in cookies:
             if PY3:
-                cookie = cookie.decode("iso-8859-1")
+                # BaseCookie.load expects a text string.
+                cookie = isomorphic_decode(cookie)
             parser.load(cookie)
 
         if name in parser.keys():
@@ -297,24 +308,10 @@ class MultipartPart(object):
 
 
 def _maybe_encode(s):
-    """Encodes a text-type string into binary data using iso-8859-1.
-
-    Returns `str` in Python 2 and `bytes` in Python 3. The function is a no-op
-    if the argument already has a binary type.
-    """
-    if isinstance(s, binary_type):
-        return s
-
-    # Python 3 assumes iso-8859-1 when parsing headers, which will garble text
-    # with non ASCII characters. We try to encode the text back to binary.
-    # https://github.com/python/cpython/blob/273fc220b25933e443c82af6888eb1871d032fb8/Lib/http/client.py#L213
-    if isinstance(s, text_type):
-        return s.encode("iso-8859-1")
-
+    """Encode a string or an int into binary data using isomorphic_encode()."""
     if isinstance(s, integer_types):
         return b"%i" % (s,)
-
-    raise TypeError("Unexpected value in ResponseHeaders: %r" % s)
+    return isomorphic_encode(s)
 
 
 class ResponseHeaders(object):
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/stash.py b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/stash.py
index 541aced6010..6b351847491 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/stash.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/stash.py
@@ -4,7 +4,9 @@ import os
 import uuid
 import threading
 from multiprocessing.managers import AcquirerProxy, BaseManager, DictProxy
-from six import text_type
+from six import text_type, binary_type
+
+from .utils import isomorphic_encode
 
 
 class ServerDictManager(BaseManager):
@@ -145,9 +147,12 @@ class Stash(object):
         if path is None:
             path = self.default_path
         # This key format is required to support using the path. Since the data
-        # passed into the stash can be a DictProxy which wouldn't detect changes
-        # when writing to a subdict.
-        return (str(path), str(uuid.UUID(key)))
+        # passed into the stash can be a DictProxy which wouldn't detect
+        # changes when writing to a subdict.
+        if isinstance(key, binary_type):
+            # UUIDs are within the ASCII charset.
+            key = key.decode('ascii')
+        return (isomorphic_encode(path), uuid.UUID(key).bytes)
 
     def put(self, key, value, path=None):
         """Place a value in the shared stash.
diff --git a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/utils.py b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/utils.py
index 64b08a27aa8..b005b417d74 100644
--- a/tests/wpt/web-platform-tests/tools/wptserve/wptserve/utils.py
+++ b/tests/wpt/web-platform-tests/tools/wptserve/wptserve/utils.py
@@ -1,6 +1,45 @@
 import socket
 import sys
 
+from six import binary_type, text_type
+
+
+def isomorphic_decode(s):
+    """Decodes a binary string into a text string using iso-8859-1.
+
+    Returns `unicode` in Python 2 and `str` in Python 3. The function is a
+    no-op if the argument already has a text type. iso-8859-1 is chosen because
+    it is an 8-bit encoding whose code points range from 0x0 to 0xFF and the
+    values are the same as the binary representations, so any binary string can
+    be decoded into and encoded from iso-8859-1 without any errors or data
+    loss. Python 3 also uses iso-8859-1 (or latin-1) extensively in http:
+    https://github.com/python/cpython/blob/273fc220b25933e443c82af6888eb1871d032fb8/Lib/http/client.py#L213
+    """
+    if isinstance(s, text_type):
+        return s
+
+    if isinstance(s, binary_type):
+        return s.decode("iso-8859-1")
+
+    raise TypeError("Unexpected value (expecting string-like): %r" % s)
+
+
+def isomorphic_encode(s):
+    """Encodes a text-type string into binary data using iso-8859-1.
+
+    Returns `str` in Python 2 and `bytes` in Python 3. The function is a no-op
+    if the argument already has a binary type. This is the counterpart of
+    isomorphic_decode.
+    """
+    if isinstance(s, binary_type):
+        return s
+
+    if isinstance(s, text_type):
+        return s.encode("iso-8859-1")
+
+    raise TypeError("Unexpected value (expecting string-like): %r" % s)
+
+
 def invert_dict(dict):
     rv = {}
     for key, values in dict.items():
@@ -25,6 +64,7 @@ def _open_socket(host, port):
     sock.listen(5)
     return sock
 
+
 def is_bad_port(port):
     """
     Bad port as per https://fetch.spec.whatwg.org/#port-blocking
@@ -99,6 +139,7 @@ def is_bad_port(port):
         6697,  # irc+tls
     ]
 
+
 def get_port(host=''):
     host = host or '127.0.0.1'
     port = 0
diff --git a/tests/wpt/web-platform-tests/wasm/jsapi/prototypes.any.js b/tests/wpt/web-platform-tests/wasm/jsapi/prototypes.any.js
new file mode 100644
index 00000000000..714f4f8430e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/wasm/jsapi/prototypes.any.js
@@ -0,0 +1,43 @@
+// META: global=window,dedicatedworker,jsshell
+// META: script=/wasm/jsapi/assertions.js
+// META: script=/wasm/jsapi/wasm-module-builder.js
+
+let emptyModuleBinary;
+setup(() => {
+  emptyModuleBinary = new WasmModuleBuilder().toBuffer();
+});
+
+test(() => {
+  class _Module extends WebAssembly.Module {}
+  let module = new _Module(emptyModuleBinary);
+  assert_true(module instanceof _Module, "_Module instanceof _Module");
+  assert_true(module instanceof WebAssembly.Module, "_Module instanceof WebAssembly.Module");
+}, "_Module");
+
+test(() => {
+  class _Instance extends WebAssembly.Instance {}
+  let instance = new _Instance(new WebAssembly.Module(emptyModuleBinary));
+  assert_true(instance instanceof _Instance, "_Instance instanceof _Instance");
+  assert_true(instance instanceof WebAssembly.Instance, "_Instance instanceof WebAssembly.Instance");
+}, "_Instance");
+
+test(() => {
+  class _Memory extends WebAssembly.Memory {}
+  let memory = new _Memory({initial: 0, maximum: 1});
+  assert_true(memory instanceof _Memory, "_Memory instanceof _Memory");
+  assert_true(memory instanceof WebAssembly.Memory, "_Memory instanceof WebAssembly.Memory");
+}, "_Memory");
+
+test(() => {
+  class _Table extends WebAssembly.Table {}
+  let table = new _Table({initial: 0, element: "anyfunc"});
+  assert_true(table instanceof _Table, "_Table instanceof _Table");
+  assert_true(table instanceof WebAssembly.Table, "_Table instanceof WebAssembly.Table");
+}, "_Table");
+
+test(() => {
+  class _Global extends WebAssembly.Global {}
+  let global = new _Global({value: "i32", mutable: false}, 0);
+  assert_true(global instanceof _Global, "_Global instanceof _Global");
+  assert_true(global instanceof WebAssembly.Global, "_Global instanceof WebAssembly.Global");
+}, "_Global");
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html
new file mode 100644
index 00000000000..ab9df8740fa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-biquad-connection.html
@@ -0,0 +1,456 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Test k-rate AudioParam Inputs for BiquadFilterNode</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+  </head>
+
+  <body>
+    <script>
+      // sampleRate and duration are fairly arbitrary.  We use low values to
+      // limit the complexity of the test.
+      let sampleRate = 8192;
+      let testDuration = 0.5;
+
+      let audit = Audit.createTaskRunner();
+
+      audit.define(
+          {label: 'Frequency AudioParam', description: 'k-rate input works'},
+          async (task, should) => {
+            // Test frequency AudioParam using a lowpass filter whose bandwidth
+            // is initially larger than the oscillator frequency.  Then automate
+            // the frequency to 0 so that the output of the filter is 0 (because
+            // the cutoff is 0).
+            let oscFrequency = 440;
+
+            let options = {
+              sampleRate: sampleRate,
+              paramName: 'frequency',
+              oscFrequency: oscFrequency,
+              testDuration: testDuration,
+              filterOptions: {type: 'lowpass', frequency: 0},
+              autoStart:
+                  {method: 'setValueAtTime', args: [2 * oscFrequency, 0]},
+              autoEnd: {
+                method: 'linearRampToValueAtTime',
+                args: [0, testDuration / 4]
+              }
+            };
+
+            let buffer = await doTest(should, options);
+            let expected = buffer.getChannelData(0);
+            let actual = buffer.getChannelData(1);
+            let halfLength = expected.length / 2;
+
+            // Sanity check.  The expected output should not be zero for
+            // the first half, but should be zero for the second half
+            // (because the filter bandwidth is exactly 0).
+            const prefix = 'Expected k-rate frequency with automation';
+
+            should(
+                expected.slice(0, halfLength),
+                `${prefix} output[0:${halfLength - 1}]`)
+                .notBeConstantValueOf(0);
+            should(
+                expected.slice(expected.length),
+                `${prefix} output[${halfLength}:]`)
+                .beConstantValueOf(0);
+
+            // Outputs should be the same.  Break the message into two
+            // parts so we can see the expected outputs.
+            checkForSameOutput(should, options.paramName, actual, expected);
+
+            task.done();
+          });
+
+      audit.define(
+          {label: 'Q AudioParam', description: 'k-rate input works'},
+          async (task, should) => {
+            // Test Q AudioParam.  Use a bandpass filter whose center frequency
+            // is fairly far from the oscillator frequency.  Then start with a Q
+            // value of 0 (so everything goes through) and then increase Q to
+            // some large value such that the out-of-band signals are basically
+            // cutoff.
+            let frequency = 440;
+            let oscFrequency = 4 * frequency;
+
+            let options = {
+              sampleRate: sampleRate,
+              oscFrequency: oscFrequency,
+              testDuration: testDuration,
+              paramName: 'Q',
+              filterOptions: {type: 'bandpass', frequency: frequency, Q: 0},
+              autoStart: {method: 'setValueAtTime', args: [0, 0]},
+              autoEnd: {
+                method: 'linearRampToValueAtTime',
+                args: [100, testDuration / 4]
+              }
+            };
+
+            const buffer = await doTest(should, options);
+            let expected = buffer.getChannelData(0);
+            let actual = buffer.getChannelData(1);
+
+            // Outputs should be the same
+            checkForSameOutput(should, options.paramName, actual, expected);
+
+            task.done();
+          });
+
+      audit.define(
+          {label: 'Gain AudioParam', description: 'k-rate input works'},
+          async (task, should) => {
+            // Test gain AudioParam.  Use a peaking filter with a large Q so the
+            // peak is narrow with a center frequency the same as the oscillator
+            // frequency.  Start with a gain of 0 so everything goes through and
+            // then ramp the gain down to -100 so that the oscillator is
+            // filtered out.
+            let oscFrequency = 4 * 440;
+
+            let options = {
+              sampleRate: sampleRate,
+              oscFrequency: oscFrequency,
+              testDuration: testDuration,
+              paramName: 'gain',
+              filterOptions:
+                  {type: 'peaking', frequency: oscFrequency, Q: 100, gain: 0},
+              autoStart: {method: 'setValueAtTime', args: [0, 0]},
+              autoEnd: {
+                method: 'linearRampToValueAtTime',
+                args: [-100, testDuration / 4]
+              }
+            };
+
+            const buffer = await doTest(should, options);
+            let expected = buffer.getChannelData(0);
+            let actual = buffer.getChannelData(1);
+
+            // Outputs should be the same
+            checkForSameOutput(should, options.paramName, actual, expected);
+
+            task.done();
+          });
+
+      audit.define(
+          {label: 'Detune AudioParam', description: 'k-rate input works'},
+          async (task, should) => {
+            // Test detune AudioParam.  The basic idea is the same as the
+            // frequency test above, but insteda of automating the frequency, we
+            // automate the detune value so that initially the filter cutuff is
+            // unchanged and then changing the detune until the cutoff goes to 1
+            // Hz, which would cause the oscillator to be filtered out.
+            let oscFrequency = 440;
+            let filterFrequency = 5 * oscFrequency;
+
+            // For a detune value d, the computed frequency, fc, of the filter
+            // is fc = f*2^(d/1200), where f is the frequency of the filter.  Or
+            // d = 1200*log2(fc/f).  Compute the detune value to produce a final
+            // cutoff frequency of 1 Hz.
+            let detuneEnd = 1200 * Math.log2(1 / filterFrequency);
+
+            let options = {
+              sampleRate: sampleRate,
+              oscFrequency: oscFrequency,
+              testDuration: testDuration,
+              paramName: 'detune',
+              filterOptions: {
+                type: 'lowpass',
+                frequency: filterFrequency,
+                detune: 0,
+                gain: 0
+              },
+              autoStart: {method: 'setValueAtTime', args: [0, 0]},
+              autoEnd: {
+                method: 'linearRampToValueAtTime',
+                args: [detuneEnd, testDuration / 4]
+              }
+            };
+
+            const buffer = await doTest(should, options);
+            let expected = buffer.getChannelData(0);
+            let actual = buffer.getChannelData(1);
+
+            // Outputs should be the same
+            checkForSameOutput(should, options.paramName, actual, expected);
+
+            task.done();
+          });
+
+      audit.define('All k-rate inputs', async (task, should) => {
+        // Test the case where all AudioParams are set to k-rate with an input
+        // to each AudioParam.  Similar to the above tests except all the params
+        // are k-rate.
+        let testFrames = testDuration * sampleRate;
+        let context = new OfflineAudioContext(
+            {numberOfChannels: 2, sampleRate: sampleRate, length: testFrames});
+
+        let merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+        merger.connect(context.destination);
+
+        let src = new OscillatorNode(context);
+
+        // The peaking filter uses all four AudioParams, so this is the node to
+        // test.
+        let filterOptions =
+            {type: 'peaking', frequency: 0, detune: 0, gain: 0, Q: 0};
+        let refNode;
+        should(
+            () => refNode = new BiquadFilterNode(context, filterOptions),
+            `Create: refNode = new BiquadFilterNode(context, ${
+                JSON.stringify(filterOptions)})`)
+            .notThrow();
+
+        let tstNode;
+        should(
+            () => tstNode = new BiquadFilterNode(context, filterOptions),
+            `Create: tstNode = new BiquadFilterNode(context, ${
+                JSON.stringify(filterOptions)})`)
+            .notThrow();
+        ;
+
+        // Make all the AudioParams k-rate.
+        ['frequency', 'Q', 'gain', 'detune'].forEach(param => {
+          should(
+              () => refNode[param].automationRate = 'k-rate',
+              `Set rate: refNode[${param}].automationRate = 'k-rate'`)
+              .notThrow();
+          should(
+              () => tstNode[param].automationRate = 'k-rate',
+              `Set rate: tstNode[${param}].automationRate = 'k-rate'`)
+              .notThrow();
+        });
+
+        // One input for each AudioParam.
+        let mod = {};
+        ['frequency', 'Q', 'gain', 'detune'].forEach(param => {
+          should(
+              () => mod[param] = new ConstantSourceNode(context, {offset: 0}),
+              `Create: mod[${
+                  param}] = new ConstantSourceNode(context, {offset: 0})`)
+              .notThrow();
+          ;
+          should(
+              () => mod[param].offset.automationRate = 'a-rate',
+              `Set rate: mod[${param}].offset.automationRate = 'a-rate'`)
+              .notThrow();
+        });
+
+        // Set up automations for refNode.  We want to start the filter with
+        // parameters that let the oscillator signal through more or less
+        // untouched.  Then change the filter parameters to filter out the
+        // oscillator.  What happens in between doesn't reall matter for this
+        // test.  Hence, set the initial parameters with a center frequency well
+        // above the oscillator and a Q and gain of 0 to pass everthing.
+        [['frequency', [4 * src.frequency.value, 0]], ['Q', [0, 0]],
+         ['gain', [0, 0]], ['detune', [4 * 1200, 0]]]
+            .forEach(param => {
+              should(
+                  () => refNode[param[0]].setValueAtTime(...param[1]),
+                  `Automate 0: refNode.${param[0]}.setValueAtTime(${
+                      param[1][0]}, ${param[1][1]})`)
+                  .notThrow();
+              should(
+                  () => mod[param[0]].offset.setValueAtTime(...param[1]),
+                  `Automate 0: mod[${param[0]}].offset.setValueAtTime(${
+                      param[1][0]}, ${param[1][1]})`)
+                  .notThrow();
+            });
+
+        // Now move the filter frequency to the oscillator frequency with a high
+        // Q and very low gain to remove the oscillator signal.
+        [['frequency', [src.frequency.value, testDuration / 4]],
+         ['Q', [40, testDuration / 4]], ['gain', [-100, testDuration / 4]], [
+           'detune', [0, testDuration / 4]
+         ]].forEach(param => {
+          should(
+              () => refNode[param[0]].linearRampToValueAtTime(...param[1]),
+              `Automate 1: refNode[${param[0]}].linearRampToValueAtTime(${
+                  param[1][0]}, ${param[1][1]})`)
+              .notThrow();
+          should(
+              () => mod[param[0]].offset.linearRampToValueAtTime(...param[1]),
+              `Automate 1: mod[${param[0]}].offset.linearRampToValueAtTime(${
+                  param[1][0]}, ${param[1][1]})`)
+              .notThrow();
+        });
+
+        // Connect everything
+        src.connect(refNode).connect(merger, 0, 0);
+        src.connect(tstNode).connect(merger, 0, 1);
+
+        src.start();
+        for (let param in mod) {
+          should(
+              () => mod[param].connect(tstNode[param]),
+              `Connect: mod[${param}].connect(tstNode.${param})`)
+              .notThrow();
+        }
+
+        for (let param in mod) {
+          should(() => mod[param].start(), `Start: mod[${param}].start()`)
+              .notThrow();
+        }
+
+        const buffer = await context.startRendering();
+        let expected = buffer.getChannelData(0);
+        let actual = buffer.getChannelData(1);
+
+        // Sanity check that the output isn't all zeroes.
+        should(actual, 'All k-rate AudioParams').notBeConstantValueOf(0);
+        should(actual, 'All k-rate AudioParams').beCloseToArray(expected, {
+          absoluteThreshold: 0
+        });
+
+        task.done();
+      });
+
+      audit.run();
+
+      async function doTest(should, options) {
+        // Test that a k-rate AudioParam with an input reads the input value and
+        // is actually k-rate.
+        //
+        // A refNode is created with an automation timeline.  This is the
+        // expected output.
+        //
+        // The testNode is the same, but it has a node connected to the k-rate
+        // AudioParam.  The input to the node is an a-rate ConstantSourceNode
+        // whose output is automated in exactly the same was as the refNode.  If
+        // the test passes, the outputs of the two nodes MUST match exactly.
+
+        // The options argument MUST contain the following members:
+        //   sampleRate - the sample rate for the offline context
+        //   testDuration - duration of the offline context, in sec.
+        //   paramName  - the name of the AudioParam to be tested
+        //   oscFrequency - frequency of oscillator source
+        //   filterOptions - options used to construct the BiquadFilterNode
+        //   autoStart     - information about how to start the automation
+        //   autoEnd       - information about how to end the automation
+        //
+        //   The autoStart and autoEnd options are themselves dictionaries with
+        //   the following required members:
+        //     method - name of the automation method to be applied
+        //     args   - array of arguments to be supplied to the method.
+        let {
+          sampleRate,
+          paramName,
+          oscFrequency,
+          autoStart,
+          autoEnd,
+          testDuration,
+          filterOptions
+        } = options;
+
+        let testFrames = testDuration * sampleRate;
+        let context = new OfflineAudioContext(
+            {numberOfChannels: 2, sampleRate: sampleRate, length: testFrames});
+
+        let merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+        merger.connect(context.destination);
+
+        // Any calls to |should| are meant to be informational so we can see
+        // what nodes are created and the automations used.
+        let src;
+
+        // Create the source.
+        should(
+            () => {
+              src = new OscillatorNode(context, {frequency: oscFrequency});
+            },
+            `${paramName}: new OscillatorNode(context, {frequency: ${
+                oscFrequency}})`)
+            .notThrow();
+
+        // The refNode automates the AudioParam with k-rate automations, no
+        // inputs.
+        let refNode;
+        should(
+            () => {
+              refNode = new BiquadFilterNode(context, filterOptions);
+            },
+            `Reference BiquadFilterNode(c, ${JSON.stringify(filterOptions)})`)
+            .notThrow();
+
+        refNode[paramName].automationRate = 'k-rate';
+
+        // Set up automations for the reference node.
+        should(
+            () => {
+              refNode[paramName][autoStart.method](...autoStart.args);
+            },
+            `refNode.${paramName}.${autoStart.method}(${autoStart.args})`)
+            .notThrow();
+        should(
+            () => {
+              refNode[paramName][autoEnd.method](...autoEnd.args);
+            },
+            `refNode.${paramName}.${autoEnd.method}.(${autoEnd.args})`)
+            .notThrow();
+
+        // The tstNode does the same automation, but it comes from the input
+        // connected to the AudioParam.
+        let tstNode;
+        should(
+            () => {
+              tstNode = new BiquadFilterNode(context, filterOptions);
+            },
+            `Test BiquadFilterNode(context, ${JSON.stringify(filterOptions)})`)
+            .notThrow();
+        tstNode[paramName].automationRate = 'k-rate';
+
+        // Create the input to the AudioParam of the test node.  The output of
+        // this node MUST have the same set of automations as the reference
+        // node, and MUST be a-rate to make sure we're handling k-rate inputs
+        // correctly.
+        let mod = new ConstantSourceNode(context);
+        mod.offset.automationRate = 'a-rate';
+        should(
+            () => {
+              mod.offset[autoStart.method](...autoStart.args);
+            },
+            `${paramName}: mod.offset.${autoStart.method}(${autoStart.args})`)
+            .notThrow();
+        should(
+            () => {
+              mod.offset[autoEnd.method](...autoEnd.args);
+            },
+            `${paramName}: mod.offset.${autoEnd.method}(${autoEnd.args})`)
+            .notThrow();
+
+        // Create graph
+        mod.connect(tstNode[paramName]);
+        src.connect(refNode).connect(merger, 0, 0);
+        src.connect(tstNode).connect(merger, 0, 1);
+
+        // Run!
+        src.start();
+        mod.start();
+        return context.startRendering();
+      }
+
+      function checkForSameOutput(should, paramName, actual, expected) {
+        let halfLength = expected.length / 2;
+
+        // Outputs should be the same.  We break the check into halves so we can
+        // see the expected outputs.  Mostly for a simple visual check that the
+        // output from the second half is small because the tests generally try
+        // to filter out the signal so that the last half of the output is
+        // small.
+        should(
+            actual.slice(0, halfLength),
+            `k-rate ${paramName} with input: output[0,${halfLength}]`)
+            .beCloseToArray(
+                expected.slice(0, halfLength), {absoluteThreshold: 0});
+        should(
+            actual.slice(halfLength),
+            `k-rate ${paramName} with input: output[${halfLength}:]`)
+            .beCloseToArray(expected.slice(halfLength), {absoluteThreshold: 0});
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webrtc/simulcast/basic.https.html b/tests/wpt/web-platform-tests/webrtc/simulcast/basic.https.html
index f097ebb7f38..5d5f3b52f5f 100644
--- a/tests/wpt/web-platform-tests/webrtc/simulcast/basic.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/simulcast/basic.https.html
@@ -1,6 +1,7 @@
 <!doctype html>
 <meta charset=utf-8>
 <title>RTCPeerConnection Simulcast Tests</title>
+<meta name="timeout" content="long">
 <script src="../third_party/sdp/sdp.js"></script>
 <script src="simulcast.js"></script>
 <script src="../RTCPeerConnection-helper.js"></script>
diff --git a/tests/wpt/web-platform-tests/webrtc/simulcast/getStats.https.html b/tests/wpt/web-platform-tests/webrtc/simulcast/getStats.https.html
index 1161dfe2d47..78289e68538 100644
--- a/tests/wpt/web-platform-tests/webrtc/simulcast/getStats.https.html
+++ b/tests/wpt/web-platform-tests/webrtc/simulcast/getStats.https.html
@@ -1,6 +1,7 @@
 <!doctype html>
 <meta charset=utf-8>
 <title>RTCPeerConnection Simulcast Tests - getStats</title>
+<meta name="timeout" content="long">
 <script src="../third_party/sdp/sdp.js"></script>
 <script src="simulcast.js"></script>
 <script src="../RTCPeerConnection-helper.js"></script>