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-003.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
new file mode 100644
index 00000000000..f29da48a2a0
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-003.html.ini
@@ -0,0 +1,4 @@
+[hit-test-floats-003.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/dom/nodes/aria-attribute-reflection.tentative.html.ini b/tests/wpt/metadata-layout-2020/dom/nodes/aria-attribute-reflection.tentative.html.ini
new file mode 100644
index 00000000000..534900d0b57
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/dom/nodes/aria-attribute-reflection.tentative.html.ini
@@ -0,0 +1,118 @@
+[aria-attribute-reflection.tentative.html]
+  [aria-relevant attribute reflects.]
+    expected: FAIL
+
+  [aria-required attribute reflects.]
+    expected: FAIL
+
+  [aria-busy attribute reflects.]
+    expected: FAIL
+
+  [aria-current attribute reflects.]
+    expected: FAIL
+
+  [aria-valuetext attribute reflects.]
+    expected: FAIL
+
+  [aria-atomic attribute reflects.]
+    expected: FAIL
+
+  [aria-description attribute reflects.]
+    expected: FAIL
+
+  [aria-label attribute reflects.]
+    expected: FAIL
+
+  [aria-setsize attribute reflects.]
+    expected: FAIL
+
+  [aria-rowcount attribute reflects.]
+    expected: FAIL
+
+  [aria-valuemax attribute reflects.]
+    expected: FAIL
+
+  [role attribute reflects.]
+    expected: FAIL
+
+  [aria-sort attribute reflects.]
+    expected: FAIL
+
+  [aria-placeholder attribute reflects.]
+    expected: FAIL
+
+  [aria-live attribute reflects.]
+    expected: FAIL
+
+  [aria-valuenow attribute reflects.]
+    expected: FAIL
+
+  [aria-colcount attribute reflects.]
+    expected: FAIL
+
+  [aria-selected attribute reflects.]
+    expected: FAIL
+
+  [aria-checked attribute reflects.]
+    expected: FAIL
+
+  [aria-rowspan attribute reflects.]
+    expected: FAIL
+
+  [aria-pressed attribute reflects.]
+    expected: FAIL
+
+  [aria-hidden attribute reflects.]
+    expected: FAIL
+
+  [aria-multiselectable attribute reflects.]
+    expected: FAIL
+
+  [aria-autocomplete attribute reflects.]
+    expected: FAIL
+
+  [aria-posinset attribute reflects.]
+    expected: FAIL
+
+  [aria-rowindex attribute reflects.]
+    expected: FAIL
+
+  [aria-valuemin attribute reflects.]
+    expected: FAIL
+
+  [aria-level attribute reflects.]
+    expected: FAIL
+
+  [aria-disabled attribute reflects.]
+    expected: FAIL
+
+  [aria-orientation attribute reflects.]
+    expected: FAIL
+
+  [aria-colspan attribute reflects.]
+    expected: FAIL
+
+  [aria-colindex attribute reflects.]
+    expected: FAIL
+
+  [aria-roledescription attribute reflects.]
+    expected: FAIL
+
+  [aria-haspopup attribute reflects.]
+    expected: FAIL
+
+  [aria-readonly attribute reflects.]
+    expected: FAIL
+
+  [aria-expanded attribute reflects.]
+    expected: FAIL
+
+  [aria-modal attribute reflects.]
+    expected: FAIL
+
+  [aria-keyshortcuts attribute reflects.]
+    expected: FAIL
+
+  [aria-multiline attribute reflects.]
+    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 6adf3645101..1dfe13d8870 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/response.window.js.ini
@@ -312,21 +312,12 @@
   [Response: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
index b2ffc8abf78..2d5faa72ac7 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 error]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
index 87c807a49ff..2023a855086 100644
--- a/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20no%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
index c12c0f8ae48..6852d7663de 100644
--- a/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
@@ -1,4 +1,8 @@
 [skip-document-with-fragment.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with URL fragments should be skipped.]
     expected: FAIL
 
+  [Autofocus elements in top-level browsing context's documents with URI fragments should be skipped.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 0407f0cc2b7..0218bc9ba9d 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/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/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
index 77032256502..da6575fdae8 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
@@ -77,3 +77,6 @@
   [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44059 more errors.\n\tMax AbsError of 1.9986611604690552e+0 at index of 17285.\n\t[17285\]\t-9.9994289875030518e-1\t9.9871826171875000e-1\t1.9986611604690552e+0\t2.0012262087101997e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
     expected: FAIL
 
+  [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44054 more errors.\n\tMax AbsError of 1.9961981773376465e+0 at index of 18538.\n\t[18538\]\t-9.9879217147827148e-1\t9.9740600585937500e-1\t1.9961981773376465e+0\t2.0013897706758867e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index b105dc0821e..7e05d1788d4 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -128,3 +128,9 @@
   [X Stitched sine-wave buffers at sample rate 44100 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t5.6092996914003379e-10\t5.6332010030746460e-1\t5.6332009974653463e-1\t9.9999999900424297e-1\t9.0957000000000003e-5\n\t[31081\]\t4.5875709125065861e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 6.1397600173950195e-1 at index of 31081.\n\tMax RelError of 1.0000000000000000e+0 at index of 31081.\n]
     expected: FAIL
 
+  [X SNR (-397.6865329305962 dB) is not greater than or equal to 85.58. Got -397.6865329305962.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 44100 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t-1.1377083450655894e+22\t5.6332010030746460e-1\t1.1377083450655894e+22\t2.0196480552435802e+22\t9.0957000000000003e-5\n\t[31081\]\t4.5654303967702540e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 1.1377083450655894e+22 at index of 31080.\n\tMax RelError of 2.0196480552435802e+22 at index of 31080.\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini
new file mode 100644
index 00000000000..25f8900c7c8
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini
@@ -0,0 +1,16 @@
+[k-rate-audiobuffersource-connections.html]
+  [< [detune\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate playbackRate AudioParam with input does not equal [0,0.0005000000237487257,0.0010000000474974513,0.001500000013038516,0.0020000000949949026,0.0024999999441206455,0.003000000026077032,0.0035000001080334187,0.004000000189989805,0.0044999998062849045,0.004999999888241291,0.005499999970197678,0.006000000052154064,0.006500000134110451,0.007000000216066837,0.007499999832361937...\] 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[129\]\t6.4531765878200531e-2\t6.4499996602535248e-2\t3.1769275665283203e-5\t4.9254693548362878e-4\t0.0000000000000000e+0\n\t[130\]\t6.5063528716564178e-2\t6.4999997615814209e-2\t6.3531100749969482e-5\t9.7740158585040695e-4\t0.0000000000000000e+0\n\t[131\]\t6.5595299005508423e-2\t6.5499998629093170e-2\t9.5300376415252686e-5\t1.4549676093111102e-3\t0.0000000000000000e+0\n\t[132\]\t6.6127061843872070e-2\t6.5999999642372131e-2\t1.2706220149993896e-4\t1.9251848816430111e-3\t0.0000000000000000e+0\n\t[133\]\t6.6658832132816315e-2\t6.6500000655651093e-2\t1.5883147716522217e-4\t2.3884432420937856e-3\t0.0000000000000000e+0\n\t...and 1392 more errors.\n\tMax AbsError of 9.9942302703857422e-1 at index of 1525.\n\t[1525\]\t0.0000000000000000e+0\t9.9942302703857422e-1\t9.9942302703857422e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n\tMax RelError of 1.0000000000000000e+0 at index of 1492.\n\t[1492\]\t0.0000000000000000e+0\t9.7164100408554077e-1\t9.7164100408554077e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 2 out of 2 tasks were failed.]
+    expected: FAIL
+
+  [X k-rate detune AudioParam with input does not equal [0,0.0002500000118743628,0.0005000000237487257,0.000750000006519258,0.0010000000474974513,0.0012499999720603228,0.001500000013038516,0.0017500000540167093,0.0020000000949949026,0.0022499999031424522,0.0024999999441206455,0.002749999985098839,0.003000000026077032,0.0032500000670552254,0.0035000001080334187,0.003750000149011612...\] 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[129\]\t3.2273016870021820e-2\t3.2250002026557922e-2\t2.3014843463897705e-5\t7.1363851217574957e-4\t0.0000000000000000e+0\n\t[130\]\t3.2546032220125198e-2\t3.2499998807907104e-2\t4.6033412218093872e-5\t1.4164127355873672e-3\t0.0000000000000000e+0\n\t[131\]\t3.2819051295518875e-2\t3.2749999314546585e-2\t6.9051980972290039e-5\t2.1084574783981503e-3\t0.0000000000000000e+0\n\t[132\]\t3.3092070370912552e-2\t3.2999999821186066e-2\t9.2070549726486206e-5\t2.7900166734963656e-3\t0.0000000000000000e+0\n\t[133\]\t3.3365085721015930e-2\t3.3250000327825546e-2\t1.1508539319038391e-4\t3.4612147986679484e-3\t0.0000000000000000e+0\n\t...and 1866 more errors.\n\tMax AbsError of 9.9793279170989990e-1 at index of 1999.\n\t[1999\]\t0.0000000000000000e+0\t9.9793279170989990e-1\t9.9793279170989990e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n\tMax RelError of 1.0000000000000000e+0 at index of 1963.\n\t[1963\]\t0.0000000000000000e+0\t9.6400356292724609e-1\t9.6400356292724609e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [playbackRate\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini
new file mode 100644
index 00000000000..06ee46812c4
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini
@@ -0,0 +1,28 @@
+[k-rate-delay-connections.html]
+  [X refNode.delayTime.automationRate = 'k-rate' incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 1 out of 1 tasks were failed.]
+    expected: FAIL
+
+  [X refNode.delayTime.linearRampToValueAtTime(1.125, 1) incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [X testNode.delayTime.automationRate = 'k-rate' incorrectly threw TypeError: "testNode is undefined".]
+    expected: FAIL
+
+  [X refNode.delayTime.setValueAtTime(0, 0) incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [X testNode = new DelayNode(context) incorrectly threw ReferenceError: "DelayNode is not defined".]
+    expected: FAIL
+
+  [X testMod.connect(testNode.delayTime) incorrectly threw TypeError: "testNode is undefined".]
+    expected: FAIL
+
+  [X refNode = new DelayNode(context) incorrectly threw ReferenceError: "DelayNode is not defined".]
+    expected: FAIL
+
+  [Executing "delayTime"]
+    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 799e611fae3..eb05c2af50b 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -82,6 +82,13 @@
        {}
       ]
      ],
+     "position-relative-with-scrollable-with-abspos-crash.html": [
+      "f0699f2046089da69c04c0085a2622290b8827b7",
+      [
+       null,
+       {}
+      ]
+     ],
      "remove-out-of-flow-child-crash.html": [
       "dfffdffd8d6fe2e65aa72aef94cb0d953fed21ca",
       [
@@ -98,6 +105,15 @@
      ]
     },
     "css-grid": {
+     "abspos": {
+      "positioned-grid-items-crash.html": [
+       "228a6264df77fe82587a4116f231ff09537c8372",
+       [
+        null,
+        {}
+       ]
+      ]
+     },
      "subgrid": {
       "contain-strict-nested-subgrid-crash.html": [
        "a98e43777eee9347ba1d69a4b133140cea0577fc",
@@ -17040,6 +17056,24 @@
       {}
      ]
     ],
+    "motion": {
+     "page-visibility-manual.https.html": [
+      "37e48ce9791eb952c7375ee0e6cbd71727e54aa7",
+      [
+       null,
+       {}
+      ]
+     ]
+    },
+    "orientation": {
+     "page-visibility-manual.https.html": [
+      "033f17602b88343313afbd1958805a628a7b3112",
+      [
+       null,
+       {}
+      ]
+     ]
+    },
     "screen-upmost-manual.https.html": [
      "560c3e3a1f6bde251197585843263dcd1fc8ed6d",
      [
@@ -17054,27 +17088,6 @@
       {}
      ]
     ],
-    "t001-manual.https.html": [
-     "a38d3fd5398f5c49da5034e5a357d908ee0e6dc3",
-     [
-      null,
-      {}
-     ]
-    ],
-    "t002-manual.https.html": [
-     "13acb46838a85292ee9b679391d49c8bf191050d",
-     [
-      null,
-      {}
-     ]
-    ],
-    "t003-manual.https.html": [
-     "328132d08e8c06f9979f66dc5c46ddf6d465fdd5",
-     [
-      null,
-      {}
-     ]
-    ],
     "t006-manual.https.html": [
      "e41f4634e8bc3d26b9a69d86b6794b922cd5df53",
      [
@@ -17103,27 +17116,6 @@
       {}
      ]
     ],
-    "t021-manual.https.html": [
-     "449d6100f10b141044ae9802a3121a72c115c109",
-     [
-      null,
-      {}
-     ]
-    ],
-    "t022-manual.https.html": [
-     "45e9e7e83e46f6aed982d15933245af750fb54be",
-     [
-      null,
-      {}
-     ]
-    ],
-    "t023-manual.https.html": [
-     "7606e52327d17c7b5f10f780272fd977e80840f4",
-     [
-      null,
-      {}
-     ]
-    ],
     "t025-manual.https.html": [
      "9489855fcddfc8dcfb0deb2aa032f38c87a62ce4",
      [
@@ -141631,6 +141623,19 @@
        ]
       ]
      },
+     "anonymous-grid-items-001.html": [
+      "f5ddd5c340176596b0da1ff731c07f219e7c435e",
+      [
+       null,
+       [
+        [
+         "/css/css-grid/reference/anonymous-grid-items-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "chrome-bug-001.html": [
       "7b24f41a47eeb090ec53e9a6e37a4f8a977ca802",
       [
@@ -142349,6 +142354,19 @@
         {}
        ]
       ],
+      "grid-item-script-001.html": [
+       "323e9ba3c4fb7a2f02a6f859c0915f456327ce87",
+       [
+        null,
+        [
+         [
+          "/css/css-grid/reference/grid-item-script-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "grid-items-001.html": [
        "fc9b27be4d1eb62d13afc9da04790da748b1a6ba",
        [
@@ -143352,6 +143370,19 @@
       ]
      },
      "grid-model": {
+      "column-property-should-not-apply-on-grid-container-001.html": [
+       "a79536258644b44254c08f15d20cb0e656c46317",
+       [
+        null,
+        [
+         [
+          "/css/css-grid/grid-model/reference/column-property-should-not-apply-on-grid-container-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "display-grid.html": [
        "7c6b743327ebfa74a841add8c51a5ea7ffb73ec4",
        [
@@ -143941,6 +143972,19 @@
       ]
      },
      "layout-algorithm": {
+      "auto-margins-ignored-during-track-sizing-001.html": [
+       "2a23b1bd2031e2a3cfc104a90f70ab6c38d2fe64",
+       [
+        null,
+        [
+         [
+          "/css/css-grid/layout-algorithm/references/auto-margins-ignored-during-track-sizing-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "grid-layout-free-space-unit.html": [
        "10649a963988bb7060aba3a477fe69d443f0a0ea",
        [
@@ -144163,6 +144207,19 @@
         ],
         {}
        ]
+      ],
+      "grid-template-areas-must-keep-named-columns-order-001.html": [
+       "8b0736b87f0362df78b9b56af4826c9fe3dd8304",
+       [
+        null,
+        [
+         [
+          "/css/css-grid/reference/grid-template-areas-must-keep-named-columns-order-001-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "subgrid": {
@@ -148736,6 +148793,19 @@
         {}
        ]
       ],
+      "clip-path-columns-shape-002.html": [
+       "6bd11a5e49a0c5ea810a272b44b9b1a081f4b672",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/clip-path-columns-shape-002-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
       "clip-path-element-userSpaceOnUse-001.html": [
        "1381f53cb0c0aefc82a91a232b712d18be625b97",
        [
@@ -149281,6 +149351,32 @@
         ],
         {}
        ]
+      ],
+      "reference-mutated.html": [
+       "09642853c775f33ce3b8dbd6ee26e8eba05e1b3e",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/reference-mutated-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "reference-nonexisting-existing-local.html": [
+       "d02e1439e64e79a65c185c703e4813e33225e679",
+       [
+        null,
+        [
+         [
+          "/css/css-masking/clip-path/reference/reference-nonexisting-existing-local-ref.html",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "clip-path-svg-content": {
@@ -189513,6 +189609,19 @@
        {}
       ]
      ],
+     "will-change-abspos-cb-003.html": [
+      "d5da92db4f34a977d6165aea6690d4d315b77fdb",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-abspos-cb-003-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "will-change-abspos-cb-dynamic-001.html": [
       "d2503256bcfe2336068914fb780463d4987608b5",
       [
@@ -189565,6 +189674,45 @@
        {}
       ]
      ],
+     "will-change-fixedpos-cb-004.html": [
+      "7bc5d9233625809f546c81920457f62db93ce319",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-004-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "will-change-fixedpos-cb-005.html": [
+      "7cd88bd37780383abae6fc4782946a48466b0631",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-005-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "will-change-fixedpos-cb-006.html": [
+      "ec9eaa409f47fc6a6ad0497e1a9d2dc81b1b177a",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-fixedpos-cb-006-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "will-change-stacking-context-001.html": [
       "9720953205b1cd2863649f2b69e6e01b5107acb2",
       [
@@ -189578,6 +189726,19 @@
        {}
       ]
      ],
+     "will-change-stacking-context-002.html": [
+      "1cda23b9bcfc45c4632f810096ff837084df20d0",
+      [
+       null,
+       [
+        [
+         "/css/css-will-change/will-change-stacking-context-002-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "will-change-transform-image.html": [
       "edce6c1f9bfa840004d8e82e6720be9c18bd23b6",
       [
@@ -203346,6 +203507,19 @@
        {}
       ]
      ],
+     "clip-under-filter-003.html": [
+      "2cfda2a0d3be03edc4f75a7fd1e319e1cc1008b4",
+      [
+       null,
+       [
+        [
+         "/css/filter-effects/reference/clip-under-filter-003-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "css-backdrop-filters-animation-blur.html": [
       "3d883c2efd57c0654ef90007444e7cb9b80ed578",
       [
@@ -204165,6 +204339,19 @@
        {}
       ]
      ],
+     "filter-region-transformed-composited-child-001.html": [
+      "c6bef8adf73dbae7fc8f562087858d3994573135",
+      [
+       null,
+       [
+        [
+         "/css/filter-effects/reference/filter-region-transformed-composited-child-001-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "filter-saturate-001-test.html": [
       "52182deb3fed8985bc810dd1e5af95e3095979ae",
       [
@@ -243314,6 +243501,14 @@
        "cda1f81978d9a8dbc7dd12286d8885f16007b9e0",
        []
       ],
+      "feature-policy-with-cross-origin-subresource.html": [
+       "88d1ac826fe773b8c20a0e1fb00520c0192d7037",
+       []
+      ],
+      "feature-policy-with-cross-origin-subresource.html.headers": [
+       "cb6b0cfd13c291312d53b1105aed3f44c4c8cac8",
+       []
+      ],
       "http-equiv-accept-ch.html": [
        "05e18a44fb96665299ab79f037a7ca20180bf92a",
        []
@@ -262019,7 +262214,7 @@
      ]
     },
     "resources.js": [
-     "1a758abe27e0b31dd22d2b8c04a7943271dea95c",
+     "51e98005b037013f17d91add984edfd7846a17b2",
      []
     ]
    },
@@ -294345,6 +294540,10 @@
         "0592f6d2ce582c3c89b9d7f5278eed9458531c3c",
         []
        ],
+       "column-property-should-not-apply-on-grid-container-001-ref.html": [
+        "154cf02290ce6f11ff1e2802e9a03841c8e27a43",
+        []
+       ],
        "grid-layout-stale-001-ref.html": [
         "3ade075c99cc2009aabc018aa4181b0ff930bea3",
         []
@@ -294357,6 +294556,10 @@
      },
      "layout-algorithm": {
       "references": {
+       "auto-margins-ignored-during-track-sizing-001-ref.html": [
+        "b06d89115178107b12493023f211f156f3e4b17d",
+        []
+       ],
        "grid-percent-cols-filled-shrinkwrap-001-ref.html": [
         "97bc5da7256a1c5b5961c01c336e795918d413d3",
         []
@@ -294376,6 +294579,10 @@
       }
      },
      "reference": {
+      "anonymous-grid-items-001-ref.html": [
+       "20302c2f1aa48e45b0698ed42bca866cf8f6a58e",
+       []
+      ],
       "display-grid-ref.html": [
        "8008359a6b4c92e8e4f683d7448ccc1e1ccfeca5",
        []
@@ -294424,6 +294631,10 @@
        "d5f993d051001046baaabb4bbb0a1ce641b53a44",
        []
       ],
+      "grid-item-script-001-ref.html": [
+       "2574678a8ba165fceaccff5224a615ea7d2cc864",
+       []
+      ],
       "grid-layout-auto-tracks-ref.html": [
        "9f2f91cf7fa0fd3da5b24fe2f72cfdfc8929f4a1",
        []
@@ -294460,6 +294671,10 @@
        "5489a9bffe929345e4bda3a64040e565990f0b25",
        []
       ],
+      "grid-template-areas-must-keep-named-columns-order-001-ref.html": [
+       "7ea26011b98744f7d8a4ae9f1678cf5217020b5c",
+       []
+      ],
       "grid-text-green-margin-no-collapse-ref.html": [
        "9dcba3f28fab37112a5bcb873228b66b1c7eb42b",
        []
@@ -295543,6 +295758,10 @@
         "4337cdf63758c06d261eb42bd0abc595261350c1",
         []
        ],
+       "clip-path-columns-shape-002-ref.html": [
+        "4337cdf63758c06d261eb42bd0abc595261350c1",
+        []
+       ],
        "clip-path-ellipse-ref.html": [
         "5adc91a5c00f27f0d3225c99a6c2534b5b868a8d",
         []
@@ -295622,6 +295841,14 @@
        "reference-local-url-with-base-001-ref.html": [
         "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
         []
+       ],
+       "reference-mutated-ref.html": [
+        "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
+        []
+       ],
+       "reference-nonexisting-existing-local-ref.html": [
+        "f718ea6abfbab54333ba674ff0dcd320d8672bcd",
+        []
        ]
       },
       "svg-clipPath.svg": [
@@ -305177,6 +305404,10 @@
       "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
       []
      ],
+     "will-change-abspos-cb-003-ref.html": [
+      "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
+      []
+     ],
      "will-change-fixedpos-cb-001-ref.html": [
       "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
       []
@@ -305189,10 +305420,26 @@
       "05957327c331a953cc907eeb5ffd2ba117f6f227",
       []
      ],
+     "will-change-fixedpos-cb-004-ref.html": [
+      "9dfc24c526bc2decc452a73a0065b5ae39faf5e6",
+      []
+     ],
+     "will-change-fixedpos-cb-005-ref.html": [
+      "7823c16075e133cf57731d196cee180d9a03cae4",
+      []
+     ],
+     "will-change-fixedpos-cb-006-ref.html": [
+      "05957327c331a953cc907eeb5ffd2ba117f6f227",
+      []
+     ],
      "will-change-stacking-context-001-ref.html": [
       "38138ebcac3d73796e00173f6a84ba7edaa17cd2",
       []
      ],
+     "will-change-stacking-context-002-ref.html": [
+      "38138ebcac3d73796e00173f6a84ba7edaa17cd2",
+      []
+     ],
      "will-change-transform-image-ref.html": [
       "d42d5b7fea22d3d2bc2abf782b1efc78f261f69e",
       []
@@ -308288,6 +308535,10 @@
        "60c2c336346dbd236ba29104fdd7a20fa29e7264",
        []
       ],
+      "clip-under-filter-003-ref.html": [
+       "e60456b3058be9055adbf45c4feffee4b40e9b56",
+       []
+      ],
       "drop-shadow-clipped-001-ref.html": [
        "305b1d2233de6845713fd43f2cfc1f72b1afdb60",
        []
@@ -308384,6 +308635,10 @@
        "bcf649411930d5cc839dca2a5098e12c0c49fda8",
        []
       ],
+      "filter-region-transformed-composited-child-001-ref.html": [
+       "1a8ab40d20185688033d1d71726eea43eb443229",
+       []
+      ],
       "filter-url-to-non-existent-filter-001-ref.html": [
        "c1aeed8c441e6f72c6faa893d64ae30bdacbec06",
        []
@@ -317912,7 +318167,7 @@
     ],
     "resources": {
      "generic-sensor-helpers.js": [
-      "ad11e58c7175a6add05c39cbab6123ad822b9515",
+      "aff6d172d46c960e72b180a1f9784776f9b55521",
       []
      ],
      "iframe_sensor_handler.html": [
@@ -319371,6 +319626,10 @@
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@@ -0,0 +1,4 @@
+[hit-test-floats-003.html]
+  [Miss float below something else]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
deleted file mode 100644
index baa9f1a7541..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-005.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-005.html]
-  [Miss clipped float]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
index 6ef8bb1049f..171592fc08f 100644
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -2,6 +2,3 @@
   [elementsFromPoint on the root document for points in iframe elements]
     expected: FAIL
 
-  [elementsFromPoint on inner documents]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini b/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini
index 455e86eb4dc..e24ae037ddd 100644
--- a/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini
+++ b/tests/wpt/metadata/dom/nodes/aria-attribute-reflection.tentative.html.ini
@@ -113,3 +113,6 @@
   [aria-description attribute reflects.]
     expected: FAIL
 
+  [aria-selected attribute reflects.]
+    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 2b1fa7f8d7f..87354d1e79a 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,21 +312,12 @@
   [fetch(): separate response Content-Type: text/plain ]
     expected: NOTRUN
 
-  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: text/html;x=" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: */* text/html]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*]
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index b2ffc8abf78..2d5faa72ac7 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 error]
+  [separate text/javascript;charset=windows-1252 error text/javascript]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
index 30e1b851fd4..70efd28ddfc 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,3 +11,6 @@
   [X-Content-Type-Options%3A%20nosniff%2C%2C%40%23%24%23%25%25%26%5E%26%5E*()()11!]
     expected: FAIL
 
+  [X-Content-Type-Options%3A%20no%0D%0AX-Content-Type-Options%3A%20nosniff]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
new file mode 100644
index 00000000000..87b07c3e670
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_1.html]
+  [Multiple history traversals from the same task]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..dc2e45516de
--- /dev/null
+++ b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,4 @@
+[traverse_the_history_5.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
index c12c0f8ae48..6852d7663de 100644
--- a/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
+++ b/tests/wpt/metadata/html/interaction/focus/the-autofocus-attribute/skip-document-with-fragment.html.ini
@@ -1,4 +1,8 @@
 [skip-document-with-fragment.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with URL fragments should be skipped.]
     expected: FAIL
 
+  [Autofocus elements in top-level browsing context's documents with URI fragments should be skipped.]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index d43f38b40cd..3a32693ffa8 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/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/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
index 64ff19b7967..8fd17170541 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/audiobuffersource-multi-channels.html.ini
@@ -146,3 +146,6 @@
   [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44059 more errors.\n\tMax AbsError of 1.9986611604690552e+0 at index of 17285.\n\t[17285\]\t-9.9994289875030518e-1\t9.9871826171875000e-1\t1.9986611604690552e+0\t2.0012262087101997e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
     expected: FAIL
 
+  [X Rendered audio for channel 5 does not equal [0,0.0626220703125,0.125030517578125,0.18695068359375,0.24810791015625,0.308319091796875,0.3673095703125,0.42486572265625,0.480743408203125,0.53472900390625,0.58660888671875,0.636199951171875,0.68328857421875,0.727691650390625,0.76922607421875,0.8077392578125...\] with an element-wise tolerance of {"absoluteThreshold":0.000030517578125,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[1\]\t3.6732959747314453e-1\t6.2622070312500000e-2\t3.0470752716064453e-1\t4.8658168859649127e+0\t3.0517578125000000e-5\n\t[2\]\t6.8329977989196777e-1\t1.2503051757812500e-1\t5.5826926231384277e-1\t4.4650639949963384e+0\t3.0517578125000000e-5\n\t[3\]\t9.0373212099075317e-1\t1.8695068359375000e-1\t7.1678143739700317e-1\t3.8340669508039502e+0\t3.0517578125000000e-5\n\t[4\]\t9.9780619144439697e-1\t2.4810791015625000e-1\t7.4969828128814697e-1\t3.0216621502152523e+0\t3.0517578125000000e-5\n\t[5\]\t9.5236867666244507e-1\t3.0831909179687500e-1\t6.4404958486557007e-1\t2.0889059484187866e+0\t3.0517578125000000e-5\n\t...and 44054 more errors.\n\tMax AbsError of 1.9961981773376465e+0 at index of 18538.\n\t[18538\]\t-9.9879217147827148e-1\t9.9740600585937500e-1\t1.9961981773376465e+0\t2.0013897706758867e+0\t3.0517578125000000e-5\n\tMax RelError of Infinity at index of 12348.\n\t[12348\]\t9.5105654001235962e-1\t0.0000000000000000e+0\t9.5105654001235962e-1\tInfinity\t3.0517578125000000e-5\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index 65919c2c6d2..c8d7e71fc52 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -359,3 +359,9 @@
   [X Stitched sine-wave buffers at sample rate 44100 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t5.6092996914003379e-10\t5.6332010030746460e-1\t5.6332009974653463e-1\t9.9999999900424297e-1\t9.0957000000000003e-5\n\t[31081\]\t4.5875709125065861e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 6.1397600173950195e-1 at index of 31081.\n\tMax RelError of 1.0000000000000000e+0 at index of 31081.\n]
     expected: FAIL
 
+  [X SNR (-397.6865329305962 dB) is not greater than or equal to 85.58. Got -397.6865329305962.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 44100 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.000090957,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[31080\]\t-1.1377083450655894e+22\t5.6332010030746460e-1\t1.1377083450655894e+22\t2.0196480552435802e+22\t9.0957000000000003e-5\n\t[31081\]\t4.5654303967702540e-41\t6.1397600173950195e-1\t6.1397600173950195e-1\t1.0000000000000000e+0\t9.0957000000000003e-5\n\tMax AbsError of 1.1377083450655894e+22 at index of 31080.\n\tMax RelError of 2.0196480552435802e+22 at index of 31080.\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini
new file mode 100644
index 00000000000..25f8900c7c8
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html.ini
@@ -0,0 +1,16 @@
+[k-rate-audiobuffersource-connections.html]
+  [< [detune\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
+  [X k-rate playbackRate AudioParam with input does not equal [0,0.0005000000237487257,0.0010000000474974513,0.001500000013038516,0.0020000000949949026,0.0024999999441206455,0.003000000026077032,0.0035000001080334187,0.004000000189989805,0.0044999998062849045,0.004999999888241291,0.005499999970197678,0.006000000052154064,0.006500000134110451,0.007000000216066837,0.007499999832361937...\] 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[129\]\t6.4531765878200531e-2\t6.4499996602535248e-2\t3.1769275665283203e-5\t4.9254693548362878e-4\t0.0000000000000000e+0\n\t[130\]\t6.5063528716564178e-2\t6.4999997615814209e-2\t6.3531100749969482e-5\t9.7740158585040695e-4\t0.0000000000000000e+0\n\t[131\]\t6.5595299005508423e-2\t6.5499998629093170e-2\t9.5300376415252686e-5\t1.4549676093111102e-3\t0.0000000000000000e+0\n\t[132\]\t6.6127061843872070e-2\t6.5999999642372131e-2\t1.2706220149993896e-4\t1.9251848816430111e-3\t0.0000000000000000e+0\n\t[133\]\t6.6658832132816315e-2\t6.6500000655651093e-2\t1.5883147716522217e-4\t2.3884432420937856e-3\t0.0000000000000000e+0\n\t...and 1392 more errors.\n\tMax AbsError of 9.9942302703857422e-1 at index of 1525.\n\t[1525\]\t0.0000000000000000e+0\t9.9942302703857422e-1\t9.9942302703857422e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n\tMax RelError of 1.0000000000000000e+0 at index of 1492.\n\t[1492\]\t0.0000000000000000e+0\t9.7164100408554077e-1\t9.7164100408554077e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 2 out of 2 tasks were failed.]
+    expected: FAIL
+
+  [X k-rate detune AudioParam with input does not equal [0,0.0002500000118743628,0.0005000000237487257,0.000750000006519258,0.0010000000474974513,0.0012499999720603228,0.001500000013038516,0.0017500000540167093,0.0020000000949949026,0.0022499999031424522,0.0024999999441206455,0.002749999985098839,0.003000000026077032,0.0032500000670552254,0.0035000001080334187,0.003750000149011612...\] 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[129\]\t3.2273016870021820e-2\t3.2250002026557922e-2\t2.3014843463897705e-5\t7.1363851217574957e-4\t0.0000000000000000e+0\n\t[130\]\t3.2546032220125198e-2\t3.2499998807907104e-2\t4.6033412218093872e-5\t1.4164127355873672e-3\t0.0000000000000000e+0\n\t[131\]\t3.2819051295518875e-2\t3.2749999314546585e-2\t6.9051980972290039e-5\t2.1084574783981503e-3\t0.0000000000000000e+0\n\t[132\]\t3.3092070370912552e-2\t3.2999999821186066e-2\t9.2070549726486206e-5\t2.7900166734963656e-3\t0.0000000000000000e+0\n\t[133\]\t3.3365085721015930e-2\t3.3250000327825546e-2\t1.1508539319038391e-4\t3.4612147986679484e-3\t0.0000000000000000e+0\n\t...and 1866 more errors.\n\tMax AbsError of 9.9793279170989990e-1 at index of 1999.\n\t[1999\]\t0.0000000000000000e+0\t9.9793279170989990e-1\t9.9793279170989990e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n\tMax RelError of 1.0000000000000000e+0 at index of 1963.\n\t[1963\]\t0.0000000000000000e+0\t9.6400356292724609e-1\t9.6400356292724609e-1\t1.0000000000000000e+0\t0.0000000000000000e+0\n]
+    expected: FAIL
+
+  [< [playbackRate\] 1 out of 11 assertions were failed.]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini
new file mode 100644
index 00000000000..06ee46812c4
--- /dev/null
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html.ini
@@ -0,0 +1,28 @@
+[k-rate-delay-connections.html]
+  [X refNode.delayTime.automationRate = 'k-rate' incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [# AUDIT TASK RUNNER FINISHED: 1 out of 1 tasks were failed.]
+    expected: FAIL
+
+  [X refNode.delayTime.linearRampToValueAtTime(1.125, 1) incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [X testNode.delayTime.automationRate = 'k-rate' incorrectly threw TypeError: "testNode is undefined".]
+    expected: FAIL
+
+  [X refNode.delayTime.setValueAtTime(0, 0) incorrectly threw TypeError: "refNode is undefined".]
+    expected: FAIL
+
+  [X testNode = new DelayNode(context) incorrectly threw ReferenceError: "DelayNode is not defined".]
+    expected: FAIL
+
+  [X testMod.connect(testNode.delayTime) incorrectly threw TypeError: "testNode is undefined".]
+    expected: FAIL
+
+  [X refNode = new DelayNode(context) incorrectly threw ReferenceError: "DelayNode is not defined".]
+    expected: FAIL
+
+  [Executing "delayTime"]
+    expected: FAIL
+
diff --git a/tests/wpt/web-platform-tests/appmanifest/idlharness.window.js b/tests/wpt/web-platform-tests/appmanifest/idlharness.window.js
deleted file mode 100644
index 55e8b9871e7..00000000000
--- a/tests/wpt/web-platform-tests/appmanifest/idlharness.window.js
+++ /dev/null
@@ -1,17 +0,0 @@
-// META: script=/resources/WebIDLParser.js
-// META: script=/resources/idlharness.js
-
-// https://w3c.github.io/manifest/
-
-'use strict';
-
-idl_test(
-  ['appmanifest'],
-  ['html', 'dom'],
-  idl_array => {
-    idl_array.add_objects({
-      Window: ['window'],
-      BeforeInstallPromptEvent: ['new BeforeInstallPromptEvent("type")'],
-    });
-  }
-);
diff --git a/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/cross-origin-subresource-with-feature-policy.https.html b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/cross-origin-subresource-with-feature-policy.https.html
new file mode 100644
index 00000000000..3108c23faab
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/cross-origin-subresource-with-feature-policy.https.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<meta name="timeout" content="long">
+<title>Accept-CH Persistence test</title>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="resources/accept-ch-test.js"></script>
+
+<script>
+run_test({ name: "cross origin subresources authorized by FP gets it own resources",
+    initial_url: echo,
+    accept_url: accept,
+    expect_url: "resources/feature-policy-with-cross-origin-subresource.html",
+    type: "navigation" });
+</script>
+</body>
+</html>
+
diff --git a/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html
new file mode 100644
index 00000000000..88d1ac826fe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html
@@ -0,0 +1,25 @@
+<html>
+<body>
+<script src="/common/get-host-info.sub.js"></script>
+<script>
+
+// This test checks if browser attaches the device-memory client hint in the
+// HTTP request headers --- while requesting it from 3P context after
+// settings feature policy to allow it; with Accept-CH coming from a sticky
+// source.
+
+// echo-client-hints-received.py sets the response headers depending on the set
+// of client hints it receives in the request headers.
+
+fetch(get_host_info()["HTTPS_REMOTE_ORIGIN"] + "/client-hints/accept-ch-stickiness/resources/echo-client-hints-received.py").then(r => {
+  if(r.status == 200 && r.headers.has("device-memory-received")) {
+    window.top.opener.postMessage('PASS', '*');
+  }
+  else {
+    window.top.opener.postMessage('FAIL', '*');
+  }
+});
+
+</script>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html.headers b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html.headers
new file mode 100644
index 00000000000..cb6b0cfd13c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/client-hints/accept-ch-stickiness/resources/feature-policy-with-cross-origin-subresource.html.headers
@@ -0,0 +1 @@
+Feature-Policy: ch-device-memory *;
diff --git a/tests/wpt/web-platform-tests/content-index/content-index.https.window.js b/tests/wpt/web-platform-tests/content-index/content-index.https.window.js
index 082ebc3b9ec..56870707a98 100644
--- a/tests/wpt/web-platform-tests/content-index/content-index.https.window.js
+++ b/tests/wpt/web-platform-tests/content-index/content-index.https.window.js
@@ -22,8 +22,8 @@ contentIndexTest(async (t, index) => {
   await expectTypeError(index.add(createDescription({iconUrl: '/non-existent-icon.png'})));
   await expectTypeError(index.add(createDescription({iconUrl: '/images/broken.png'})));
 
-  await expectTypeError(index.add(createDescription({launchUrl: 'https://other-domain.com/'})));
-  await expectTypeError(index.add(createDescription({launchUrl: '/different-scope'})));
+  await expectTypeError(index.add(createDescription({url: 'https://other-domain.com/'})));
+  await expectTypeError(index.add(createDescription({url: '/different-scope'})));
 
   await index.add(createDescription({}));
 
diff --git a/tests/wpt/web-platform-tests/content-index/resources.js b/tests/wpt/web-platform-tests/content-index/resources.js
index 1a758abe27e..51e98005b03 100644
--- a/tests/wpt/web-platform-tests/content-index/resources.js
+++ b/tests/wpt/web-platform-tests/content-index/resources.js
@@ -14,8 +14,8 @@ async function expectTypeError(promise) {
 
 function createDescription({id = 'id', title = 'title', description = 'description',
                             category = 'homepage', iconUrl = '/images/green-256x256.png',
-                            launchUrl = scope, includeIcons = true}) {
-  return {id, title, description, category, icons: includeIcons ? [{src: iconUrl}] : [], launchUrl};
+                            url = scope, includeIcons = true}) {
+  return {id, title, description, category, icons: includeIcons ? [{src: iconUrl}] : [], url};
 }
 
 // Creates a Promise test for |func| given the |description|. The |func| will be
diff --git a/tests/wpt/web-platform-tests/content-security-policy/inheritance/iframe-all-local-schemes.sub.html b/tests/wpt/web-platform-tests/content-security-policy/inheritance/iframe-all-local-schemes.sub.html
index cd38c902f05..20a9cbdc9e0 100644
--- a/tests/wpt/web-platform-tests/content-security-policy/inheritance/iframe-all-local-schemes.sub.html
+++ b/tests/wpt/web-platform-tests/content-security-policy/inheritance/iframe-all-local-schemes.sub.html
@@ -80,7 +80,26 @@
     wait_for_error_from_frame(i, t);
 
     document.body.appendChild(i);
-  }, "<iframe src='javascript:...'>'s inherits policy.");
+  }, "<iframe src='javascript:...'>'s inherits policy (static <img> is blocked)");
+
+  // Same as the previous javascript-URL test, but instead of loading the <img>
+  // from the new document, this one is created from the initial empty document,
+  // while evaluating the javascript-url.
+  // See https://crbug.com/1064676
+  async_test(t => {
+    let url = `javascript:
+      let img = document.createElement('img');
+      img.onload = () => window.top.postMessage('load', '*');
+      img.onerror = () => window.top.postMessage('error', '*');
+      img.src = '{{location[server]}}/images/red-16x16.png';
+      document.body.appendChild(img);
+    `;
+    var i = document.createElement('iframe');
+    i.src = encodeURI(url.replace(/\n/g, ""));
+    wait_for_error_from_frame(i, t);
+
+    document.body.appendChild(i);
+  }, "<iframe src='javascript:...'>'s inherits policy (dynamically inserted <img> is blocked)");
 
   async_test(t => {
     var i = document.createElement('iframe');
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/position-relative-with-scrollable-with-abspos-crash.html b/tests/wpt/web-platform-tests/css/css-flexbox/position-relative-with-scrollable-with-abspos-crash.html
new file mode 100644
index 00000000000..f0699f20460
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/position-relative-with-scrollable-with-abspos-crash.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<title>CSS Flexbox: Crash for flex box with relpos with scrollable with abspos</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@opera.com">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#flex-container">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable-overflow">
+<link rel="issue" href="https://crbug.com/498969">
+<meta name="assert" content="Check that crash doesn't happen in flex box with descendents that include relpos, overflow:auto scrollbars, and abspos.">
+
+<div style="display:flex;">
+    <div>
+        <div style="position:relative; width:5em;">
+            <div style="overflow:auto;">
+                <div>xxxxxxxxxxxxxxxxxxxxxx</div>
+                <div style="position:absolute;"></div>
+            </div>
+        </div>
+    </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-flexbox/table-as-item-cross-size.html b/tests/wpt/web-platform-tests/css/css-flexbox/table-as-item-cross-size.html
new file mode 100644
index 00000000000..ba788bdd72e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-flexbox/table-as-item-cross-size.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>CSS Flexbox: Correct cross size of Table with 'align-self: stretch'</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#algo-stretch">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-direction-property">
+<meta name="assert" content="This test ensures that flexbox computes a correct cross size of a <table> flex item with align-self: stretch.">
+<style>
+.container {
+    display: flex;
+    flex-direction: column;
+    height: 100px;
+    width: 50px;
+}
+.first {
+    flex: 1 1 auto;
+    background-color: blue;
+}
+.test {
+    flex: 0 0 auto;
+    background-color: green;
+    display: flex;
+}
+td {
+    padding: 23px;
+}
+</style>
+</head>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.test')">
+<div id=log></div>
+<div class="container">
+    <div class="first">
+    </div>
+    <!-- This wrapper div is a row flexbox. It should get a height of 50px, matching the height
+     of the inner table. In particular, it should not be 0 on the basis that tables don't
+     have an intrinsic block-size. -->
+    <div class="test" data-expected-height=50>
+        <table>
+            <tr><td></td></tr>
+        </table>
+    </div>
+</div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/empty-grid-001.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/empty-grid-001.html
new file mode 100644
index 00000000000..10702c76e78
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/empty-grid-001.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<title>CSS Grid: empty grid without explicit tracks.</title>
+<link rel="author" title="Sergio Villar" href="mailto:svillar@igalia.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#abspos"/>
+<link rel="issue" href="https://crrev.com/562167"/>
+<meta name="assert" content="Test ensures that the grids with no in-flow items are actually empty."/>
+
+<link href="/css/support/grid.css" rel="stylesheet"/>
+<link href="/css/support/width-keyword-classes.css" rel="stylesheet"/>
+<link href="/fonts/ahem.css" rel="stylesheet" type="text/css"/>
+<style>
+.gridWithAbsolutePositionedItem {
+  /* Ensures that the grid container is the containing block of the absolutely positioned grid children. */
+  position: relative;
+}
+
+.grid {
+  grid-auto-columns: 200px;
+  grid-auto-rows: 200px;
+}
+
+.item {
+  position: absolute;
+  font: 10px/1 Ahem;
+}
+
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script>
+function addRemoveItem()
+{
+  var gridItem = document.createElement("div");
+  gridItem.style.width = "100px";
+  gridItem.style.height = "100px";
+  gridItem.style.backgroundColor = "red";
+  var gridElement = document.getElementById("dynamicGrid");
+  gridElement.appendChild(gridItem);
+  gridElement.removeChild(gridItem);
+}
+
+setup({ explicit_done: true });
+
+function doTest() {
+  addRemoveItem();
+  checkLayout(".grid");
+}
+</script>
+
+<body onload="document.fonts.ready.then(() => { doTest(); })">
+
+<div class="grid min-content" data-expected-width="0" data-expected-height="0"></div>
+
+<div class="grid min-content gridWithAbsolutePositionedItem" data-expected-width="0" data-expected-height="0">
+  <div class="item" data-expected-width="40" data-expected-height="10">XXXX</div>
+</div>
+
+<div id="dynamicGrid" class="grid min-content" data-expected-width="0" data-expected-height="0"></div>
+
+<div class="grid min-content" style="grid-template-rows: 100px;" data-expected-width="0" data-expected-height="100"></div>
+<div class="grid min-content" style="grid-template-rows: auto;" data-expected-width="0" data-expected-height="0"></div>
+<div class="grid min-content" style="grid-template-rows: 1fr;" data-expected-width="0" data-expected-height="0"></div>
+
+<div class="grid min-content" style="grid-template-columns: 100px;" data-expected-width="100" data-expected-height="0"></div>
+<div class="grid min-content" style="grid-template-columns: auto;" data-expected-width="0" data-expected-height="0"></div>
+<div class="grid min-content" style="grid-template-columns: 1fr;" data-expected-width="0" data-expected-height="0"></div>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-crash.html b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-crash.html
new file mode 100644
index 00000000000..228a6264df7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/abspos/positioned-grid-items-crash.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Grid Layout Test: Positioned grid items</title>
+<link rel="author" title="Manuel Rego" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#abspos" title="9. Absolute Positioning">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=402504">
+<meta name="assert" content="Checks that positioned grid items (absolute or fixed) do not cause a crash."/>
+
+<link rel="stylesheet" href="/css/support/grid.css">
+<body>
+    <div class="grid">
+        <div style="position: absolute;"></div>
+        <div style="position: fixed;"></div>
+    </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/anonymous-grid-items-001.html b/tests/wpt/web-platform-tests/css/css-grid/anonymous-grid-items-001.html
new file mode 100644
index 00000000000..f5ddd5c3401
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/anonymous-grid-items-001.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Grid: anonynous grid items.</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-items">
+<link rel="match" href="reference/anonymous-grid-items-001-ref.html">
+<meta name="assert" content="This test ensures that anonymous grid items are supported."/>
+<body>
+  <div>The test passes if it has the same output than the reference.</div>
+  <div style="display: grid;">
+    anonymous item
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-definition/explicit-grid-size-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/explicit-grid-size-001.html
new file mode 100644
index 00000000000..266c6a568ca
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/explicit-grid-size-001.html
@@ -0,0 +1,176 @@
+<!DOCTYPE html>
+<title>CSS Grid: grid size with explicit grid-template-areas.</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-grid/#grid-definition"/>
+<link rel="issue" href="https://crrev.com/603160"/>
+<meta name="assert" content="Test ensures that the explicit grid size is set by the maximum of the grid-template-columns|rows properties and grid-template-areas."/>
+
+<link href="/css/support/grid.css" rel="stylesheet"/>
+<style>
+
+.grid {
+    grid-auto-columns: 10px;
+    grid-auto-rows: 10px;
+    position: relative;
+}
+
+.oneColumnOneRow {
+    grid-template-columns: 50px;
+    grid-template-rows: 50px;
+}
+
+.twoColumnsOneRow {
+    grid-template-columns: 50px 50px;
+    grid-template-rows: 50px;
+}
+
+.oneColumnTwoRows {
+    grid-template-columns: 50px;
+    grid-template-rows: 50px 50px;
+}
+
+.twoColumnsTwoRows {
+    grid-template-columns: 50px 50px;
+    grid-template-rows: 50px 50px;
+}
+
+.oneColumnOneRowAreas {
+    grid-template-areas: "a";
+}
+
+.twoColumnsOneRowAreas {
+    grid-template-areas: "a b";
+}
+
+.oneColumnTwoRowsAreas {
+    grid-template-areas: "a"
+                         "b";
+}
+
+.twoColumnsTwoRowsAreas {
+    grid-template-areas: "a b"
+                         "c d";
+}
+
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.grid')">
+<div id="log"></div>
+
+<div class="grid">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid oneColumnOneRow">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+</div>
+
+<div class="grid oneColumnOneRowAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid oneColumnTwoRows">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="50" data-expected-width="50" data-expected-height="50">
+    </div>
+</div>
+
+<div class="grid oneColumnTwoRowsAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="10" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid twoColumnsOneRow">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+</div>
+
+<div class="grid twoColumnsOneRowAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="10" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid twoColumnsTwoRows">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="50" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="50" data-expected-width="50" data-expected-height="50">
+    </div>
+</div>
+
+<div class="grid twoColumnsTwoRowsAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="10" data-offset-y="0" data-expected-width="10" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="10" data-expected-width="10" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="10" data-offset-y="10" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid oneColumnOneRow twoColumnsTwoRowsAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="0" data-expected-width="10" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="50" data-expected-width="50" data-expected-height="10">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="50" data-expected-width="10" data-expected-height="10">
+    </div>
+</div>
+
+<div class="grid twoColumnsTwoRows oneColumnOneRowAreas">
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="0" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="0" data-offset-y="50" data-expected-width="50" data-expected-height="50">
+    </div>
+    <div class="autoRowAutoColumn"
+        data-offset-x="50" data-offset-y="50" data-expected-width="50" data-expected-height="50">
+    </div>
+</div>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-columns-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-columns-001.html
new file mode 100644
index 00000000000..b92eb9f0ddd
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-columns-001.html
@@ -0,0 +1,159 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Grid Layout Test: Auto repeat tracks, grid-template-columns and minmax sizes.</title>
+<link rel="author" title="Julien Chaffraix" href="mailto:jchaffraix@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#track-sizes">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#fr-unit">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=235258">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="stylesheet" href="/css/support/grid.css">
+<meta name="assert" content="Test that resolving auto tracks on grid items inside containers using minmax() with grid-template-columns works properly." />
+
+<style>
+.gridMaxMaxContent {
+    grid-template-columns: minmax(10px, max-content) minmax(10px, 1fr);
+    grid-template-rows: 50px;
+}
+
+.gridMinMinContent {
+    grid-template-columns: minmax(10px, 1fr) minmax(min-content, 50px);
+    grid-template-rows: 50px;
+}
+
+.gridWithIntrinsicSizeBiggerThanFlex {
+    grid-template-columns: minmax(min-content, 0.5fr) minmax(18px, 2fr);
+    grid-template-rows: 50px;
+}
+
+.gridShrinkBelowItemsIntrinsicSize {
+    grid-template-columns: minmax(0px, 1fr) minmax(0px, 2fr);
+    grid-template-rows: 50px;
+}
+
+.gridWithNonFlexingItems {
+    grid-template-columns: 40px minmax(min-content, 1fr) auto minmax(20px, 2fr);
+    grid-template-rows: 50px;
+}
+
+.firstRowThirdColumn {
+    grid-column: 3;
+    grid-row: 1;
+}
+.firstRowFourthColumn {
+    grid-column: 4;
+    grid-row: 1;
+}
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script type="text/javascript">
+  setup({ explicit_done: true });
+</script>
+
+<body onload="document.fonts.ready.then(() => { checkLayout('.grid'); })">
+
+<div class="constrainedContainer">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="10" data-expected-height="50">XXXXX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="10" data-expected-height="50"></div>
+    </div>
+</div>
+
+<!-- Allow the extra logical space distribution to occur. -->
+<div style="width: 40px; height: 10px">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="30" data-expected-height="50">XXXXX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="10" data-expected-height="50"></div>
+    </div>
+</div>
+
+<div style="width: 110px; height: 10px;">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="50">XXXXX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="60" data-expected-height="50"></div>
+    </div>
+</div>
+
+
+<div class="constrainedContainer">
+    <div class="grid gridMinMinContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="10" data-expected-height="50">XX XX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="20" data-expected-height="50">XX XX</div>
+    </div>
+</div>
+
+<!-- Allow the extra logical space distribution to occur. -->
+<div style="width: 40px; height: 10px">
+    <div class="grid gridMinMinContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="10" data-expected-height="50">XX XX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="30" data-expected-height="50">XX XX</div>
+    </div>
+</div>
+
+<div style="width: 110px; height: 10px;">
+    <div class="grid gridMinMinContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="60" data-expected-height="50">XX XX</div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="50" data-expected-height="50">XX XX</div>
+    </div>
+</div>
+
+
+<div style="width: 220px; height: 10px;">
+    <div class="grid gridWithIntrinsicSizeBiggerThanFlex">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="200" data-expected-height="50">
+            <div style="display: inline-block; width: 200px;"></div>
+        </div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="20" data-expected-height="50"></div>
+    </div>
+</div>
+
+
+<div style="width: 120px; height: 10px;">
+    <div class="grid gridShrinkBelowItemsIntrinsicSize">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="40" data-expected-height="50">
+            <div style="display: inline-block; width: 200px;"></div>
+        </div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="80" data-expected-height="50">XXXXXXXXXX</div>
+    </div>
+</div>
+
+
+<!-- No space available for the <flex> -->
+<div style="width: 220px; height: 10px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="40" data-expected-height="50"></div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="100" data-expected-height="50">
+            <div style="display: inline-block; width: 100px;"></div>
+        </div>
+        <div class="sizedToGridArea firstRowThirdColumn" data-expected-width="100" data-expected-height="50">XXXXXXXXXX XXXXXXXXX</div>
+        <div class="sizedToGridArea firstRowFourthColumn" data-expected-width="20" data-expected-height="50"></div>
+    </div>
+</div>
+
+<!-- The second track should be sized after the min-content as the <flex> value should be too small. -->
+<div style="width: 380px; height: 10px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="40" data-expected-height="50"></div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="100" data-expected-height="50">
+            <div style="display: inline-block; width: 100px;"></div>
+        </div>
+        <div class="sizedToGridArea firstRowThirdColumn" data-expected-width="200" data-expected-height="50">XXXXXXXXXX XXXXXXXXX</div>
+        <div class="sizedToGridArea firstRowFourthColumn" data-expected-width="40" data-expected-height="50"></div>
+    </div>
+</div>
+
+<div style="width: 400px; height: 10px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="40" data-expected-height="50"></div>
+        <div class="sizedToGridArea firstRowSecondColumn" data-expected-width="100" data-expected-height="50">
+            <div style="display: inline-block; width: 100px;"></div>
+        </div>
+        <div class="sizedToGridArea firstRowThirdColumn" data-expected-width="200" data-expected-height="50">XXXXXXXXXX XXXXXXXXX</div>
+        <div class="sizedToGridArea firstRowFourthColumn" data-expected-width="60" data-expected-height="50"></div>
+    </div>
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-rows-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-rows-001.html
new file mode 100644
index 00000000000..ebaa2c08e4b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-definition/flex-and-minmax-content-resolution-rows-001.html
@@ -0,0 +1,222 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Grid Layout Test: Auto repeat tracks, grid-template-rows and minmax sizes.</title>
+<link rel="author" title="Julien Chaffraix" href="mailto:jchaffraix@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#track-sizes">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#fr-unit">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=235258">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<link rel="stylesheet" href="/css/support/grid.css">
+<meta name="assert" content="Test that resolving auto tracks on grid items inside containers using minmax() with grid-template-rows works properly." />
+
+<style>
+.gridMaxMaxContent {
+    grid-template-columns: 50px;
+    grid-template-rows: minmax(10px, max-content) minmax(10px, 1fr);
+}
+
+.gridMinMinContent {
+    grid-template-columns: 50px;
+    grid-template-rows: minmax(10px, 1fr) minmax(min-content, 50px);
+}
+
+.gridWithIntrinsicSizeBiggerThanFlex {
+    grid-template-columns: 50px;
+    grid-template-rows: minmax(min-content, 0.5fr) minmax(18px, 2fr);
+}
+
+.gridShrinkBelowItemsIntrinsicSize {
+    grid-template-columns: 50px;
+    grid-template-rows: minmax(0px, 1fr) minmax(0px, 2fr);
+}
+
+.gridWithNonFlexingItems {
+    grid-template-columns: 50px;
+    grid-template-rows: 40px minmax(min-content, 1fr) auto minmax(20px, 2fr);
+}
+
+.thirdRowFirstColumn {
+    grid-column: 1;
+    grid-row: 3;
+}
+.fourthRowFirstColumn {
+    grid-column: 1;
+    grid-row: 4;
+}
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script type="text/javascript">
+  setup({ explicit_done: true });
+</script>
+
+<body onload="document.fonts.ready.then(() => { checkLayout('.grid'); })">
+
+<p>Test that resolving auto tracks on grid items works properly.</p>
+
+<div class="constrainedContainer">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="10"></div>
+    </div>
+</div>
+
+<!-- Allow the extra logical space distribution to occur. -->
+<div style="width: 10px; height: 40px">
+    <div class="grid gridMaxMaxContent" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="30"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 40px">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="10"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 110px;">
+    <div class="grid gridMaxMaxContent" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="100"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 110px;">
+    <div class="grid gridMaxMaxContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="10"></div>
+    </div>
+</div>
+
+<div class="constrainedContainer">
+    <div class="grid gridMinMinContent" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX XXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="20">XXXXX XXXX</div>
+    </div>
+</div>
+
+<div class="constrainedContainer">
+    <div class="grid gridMinMinContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="20">XXXXX XXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="50">XXXXX XXXX</div>
+    </div>
+</div>
+
+<!-- Allow the extra logical space distribution to occur. -->
+<div style="width: 10px; height: 40px">
+    <div class="grid gridMinMinContent" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX XXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="30">XXXXX XXXX</div>
+    </div>
+</div>
+
+<div class="grid gridMinMinContent" style="height: 40px">
+    <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="10">XXXXX XXXX</div>
+    <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="30">XXXXX XXXX</div>
+</div>
+
+<div style="width: 10px; height: 110px;">
+    <div class="grid gridMinMinContent" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="50">XXXXX XXXX</div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 110px;">
+    <div class="grid gridMinMinContent">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="20">XXXXX XXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="50">XXXXX XXXX</div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 60px;">
+    <div class="grid gridWithIntrinsicSizeBiggerThanFlex" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="20"></div>
+    </div>
+</div>
+
+<!-- We normalize fraction flex factors to 1, so we don't keep exact proportions with >1 factors. -->
+<div style="width: 10px; height: 60px;">
+    <div class="grid gridWithIntrinsicSizeBiggerThanFlex">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="80"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 60px;">
+    <div class="grid gridShrinkBelowItemsIntrinsicSize" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="20">XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 60px;">
+    <div class="grid gridShrinkBelowItemsIntrinsicSize">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="50">XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="100">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+    </div>
+</div>
+
+<!-- No space available for the <flex> -->
+<div style="width: 10px; height: 100px;">
+    <div class="grid gridWithNonFlexingItems" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="20"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 100px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="80"></div>
+    </div>
+</div>
+
+<!-- The second track should be sized after the min-content as the <flex> value should be too small. -->
+<div style="width: 10px; height: 180px;">
+    <div class="grid gridWithNonFlexingItems" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 180px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="80"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 400px;">
+    <div class="grid gridWithNonFlexingItems" style="height: 100%">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="100">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="200"></div>
+    </div>
+</div>
+
+<div style="width: 10px; height: 400px;">
+    <div class="grid gridWithNonFlexingItems">
+        <div class="sizedToGridArea firstRowFirstColumn" data-expected-width="50" data-expected-height="40"></div>
+        <div class="sizedToGridArea secondRowFirstColumn" data-expected-width="50" data-expected-height="40">XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea thirdRowFirstColumn" data-expected-width="50" data-expected-height="60">XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX</div>
+        <div class="sizedToGridArea fourthRowFirstColumn" data-expected-width="50" data-expected-height="80"></div>
+    </div>
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-items/grid-item-script-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-items/grid-item-script-001.html
new file mode 100644
index 00000000000..323e9ba3c4f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-items/grid-item-script-001.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS Grid Layout Test: Insert script as grid item</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-item">
+<link rel="stylesheet" href="/css/support/grid.css"/>
+<link rel="match" href="../reference/grid-item-script-001-ref.html">
+<meta name="assert" content="This test ensures that inserting a script element as grid item doesn't crash.">
+<div class="grid">
+<script>
+  var grid = document.getElementsByClassName("grid")[0];
+  grid.offsetTop;
+  grid.innerHTML = "Test passes if it doesn't crash.";
+</script>
+</div>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-model/column-property-should-not-apply-on-grid-container-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-model/column-property-should-not-apply-on-grid-container-001.html
new file mode 100644
index 00000000000..a7953625864
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-model/column-property-should-not-apply-on-grid-container-001.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Grid: column-* properties are ignored.</title>
+<link rel="author" title="Sunil Ratnu" href="mailto:sunil.ratnu@samsung.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-model">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/1364">
+<link rel="match" href="reference/column-property-should-not-apply-on-grid-container-001-ref.html">
+<meta name="assert" content="This test ensures the column-* properties (in the Multicol module) have no effect on a grid container."/>
+<link href="/css/support/grid.css" rel="stylesheet"/>
+<style>
+.grid, .inline-grid
+{
+  width: 20em;
+  column-count: 2;
+  column-gap: 100px;
+  font-kerning: none;
+}
+</style>
+
+<body>
+
+<div class='grid'>
+AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
+</div>
+
+<div class='inline-grid'>
+AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-model/compute-intrinsic-widths-scrollbar-001.html b/tests/wpt/web-platform-tests/css/css-grid/grid-model/compute-intrinsic-widths-scrollbar-001.html
new file mode 100644
index 00000000000..d61f7ad14e6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-model/compute-intrinsic-widths-scrollbar-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>CSS Grid: width of grid container with scrollbar.</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#overflow">
+<meta name="assert" content="This test ensures that a grid container scrollbar is computed properly during intrinsic width calculation."/>
+
+<link href="/css/support/grid.css" rel="stylesheet"/>
+<link href="/css/support/width-keyword-classes.css" rel="stylesheet"/>
+<style>
+  .grid {
+    overflow-y: scroll;
+    grid-template-columns: repeat(4, 50px);
+  }
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<body onload="checkLayout('.grid')">
+  <div class="grid min-content" data-expected-client-width="200">
+    item
+  </div>
+  <div class="grid max-content" data-expected-client-width="200">
+    item
+  </div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/grid-model/reference/column-property-should-not-apply-on-grid-container-001-ref.html b/tests/wpt/web-platform-tests/css/css-grid/grid-model/reference/column-property-should-not-apply-on-grid-container-001-ref.html
new file mode 100644
index 00000000000..154cf02290c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/grid-model/reference/column-property-should-not-apply-on-grid-container-001-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<link href="/css/support/grid.css" rel="stylesheet">
+<style>
+.grid, .inline-grid
+{
+  width: 20em;
+  font-kerning: none;
+}
+</style>
+
+<body>
+
+<div class='grid'>
+AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
+</div>
+
+<div class='inline-grid'>
+AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD
+</div>
+
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/auto-margins-ignored-during-track-sizing-001.html b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/auto-margins-ignored-during-track-sizing-001.html
new file mode 100644
index 00000000000..2a23b1bd203
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/auto-margins-ignored-during-track-sizing-001.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<title>CSS Grid: grid items using 'auto' margins.</title>
+<link rel="author" title="Javier Fernendez" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#auto-margins">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#layout-algorithm">
+<link rel="match" href="references/auto-margins-ignored-during-track-sizing-001-ref.html">
+<meta name="assert" content="This test ensures that 'auto' margin is treated as 0px during the tracks sizing algorithm."/>
+<style>
+body { overflow: hidden; }
+.grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr 1fr;
+}
+.margin-center {
+  margin-top: 10px;
+  margin-left: auto;
+  margin-right: auto;
+}
+.i1 { background: magenta;  }
+.i2 { background: cyan; }
+.i3 { background: yellow; }
+.i4 { background: lime; }
+</style>
+<p>This test pass if the 3 items in the first row have the same size filling the whole viewport's width and the item in the second row is centered in the first column.<p>
+<div class="grid">
+  <div class="i1">
+    In a few questions, you will get an expert-designed investment portfolio to fit your financial needs.
+  </div>
+  <div class="i2">
+    Open and fund your account with 10,000 or more and we will put your money to work.
+  </div>
+  <div class="i3">
+    We will take it from here, monitoring your portfolio daily to help keep it on track.
+  </div>
+  <div class="i4 margin-center">Learn More</a>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/references/auto-margins-ignored-during-track-sizing-001-ref.html b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/references/auto-margins-ignored-during-track-sizing-001-ref.html
new file mode 100644
index 00000000000..b06d8911517
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/references/auto-margins-ignored-during-track-sizing-001-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<style>
+body { overflow: hidden; }
+.grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr 1fr;
+}
+.margin { margin-top: 10px; }
+.center { justify-self: center; }
+.i1 { background: magenta;  }
+.i2 { background: cyan; }
+.i3 { background: yellow; }
+.i4 { background: lime; }
+</style>
+<p>This test pass if the 3 items in the first row have the same size filling the whole viewport's width and the item in the second row is centered in the first column.<p>
+<div class="grid">
+  <div class="i1">
+    In a few questions, you will get an expert-designed investment portfolio to fit your financial needs.
+  </div>
+  <div class="i2">
+    Open and fund your account with 10,000 or more and we will put your money to work.
+  </div>
+  <div class="i3">
+    We will take it from here, monitoring your portfolio daily to help keep it on track.
+  </div>
+  <div class="i4 margin center">Learn More</a>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/placement/grid-template-areas-must-keep-named-columns-order-001.html b/tests/wpt/web-platform-tests/css/css-grid/placement/grid-template-areas-must-keep-named-columns-order-001.html
new file mode 100644
index 00000000000..8b0736b87f0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/placement/grid-template-areas-must-keep-named-columns-order-001.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<link rel="author" title="Javier Fernandez" href="mailto:jfernandez@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#grid-placement-slot">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-columns">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-areas">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column">
+<link rel="help" href="https://crbug.com/733577">
+<link rel="match" href="../reference/grid-template-areas-must-keep-named-columns-order-001-ref.html">
+<meta name="assert" content="A grid item located in a named line will be placed in the first one associated to that name"/>
+<style>
+.grid {
+  display: inline-grid;
+  background: grey;
+  grid-template-columns: [col] 50px [col] 50px [col] 50px [col] 50px;
+  grid-auto-rows: 50px;
+  grid-template-areas: "A . . .";
+}
+.grid > :nth-child(1) { background: magenta; }
+.grid > :nth-child(2) { background: blue; }
+.grid > :nth-child(3) { background: yellow; }
+.grid > :nth-child(4) { background: green; }
+.grid > :nth-child(5) { background: black; }
+</style>
+<p>This test passes if the black item is positioned in the first column of the second row, since the spec states that we must select the first one among several equally named grid lines.</p>
+<div class="grid">
+  <div></div>
+  <div></div>
+  <div></div>
+  <div></div>
+  <div style="grid-column: col"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/reference/anonymous-grid-items-001-ref.html b/tests/wpt/web-platform-tests/css/css-grid/reference/anonymous-grid-items-001-ref.html
new file mode 100644
index 00000000000..20302c2f1aa
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/reference/anonymous-grid-items-001-ref.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+<body>
+  <div>The test passes if it has the same output than the reference.</div>
+  <div>
+    <div>anonymous item</div>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/web-platform-tests/css/css-grid/reference/grid-item-script-001-ref.html b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-item-script-001-ref.html
new file mode 100644
index 00000000000..2574678a8ba
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-item-script-001-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="background: grey;">Test passes if it doesn't crash.</div>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/css/css-grid/reference/grid-template-areas-must-keep-named-columns-order-001-ref.html b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-template-areas-must-keep-named-columns-order-001-ref.html
new file mode 100644
index 00000000000..7ea26011b98
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-grid/reference/grid-template-areas-must-keep-named-columns-order-001-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<style>
+.grid {
+  display: inline-grid;
+  background: grey;
+  grid-template-columns: 50px 50px 50px 50px;
+  grid-template-rows: 50px 50px;
+}
+.grid > :nth-child(1) { background: magenta; }
+.grid > :nth-child(2) { background: blue; }
+.grid > :nth-child(3) { background: yellow; }
+.grid > :nth-child(4) { background: green; }
+.grid > :nth-child(5) { background: black; }
+</style>
+<p>This test passes if the black item is positioned in the first column of the second row, since the spec states that we must select the first one among several equally named grid lines.</p>
+<div class="grid">
+  <div style="grid-row: 1; grid-column: 1"></div>
+  <div style="grid-row: 1; grid-column: 2"></div>
+  <div style="grid-row: 1; grid-column: 3"></div>
+  <div style="grid-row: 1; grid-column: 4"></div>
+  <div style="grid-row: 2; grid-column: 1"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-columns-shape-002.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-columns-shape-002.html
new file mode 100644
index 00000000000..6bd11a5e49a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/clip-path-columns-shape-002.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>CSS Masking: Test clip-path property with svg clipPath element in column</title>
+<link rel="author" title="Fredrik Söderquist" href="mailto:fs@opera.com">
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="issue" href="https://bugs.chromium.org/p/chromium/issues/detail?id=626097">
+<link rel="match" href="reference/clip-path-columns-shape-002-ref.html">
+<meta name="assert" content="This test ensures that clip-path property works correctly in column layout when SVG <clipPath> elements with clipPathUnits='userSpaceOnUse' is referenced.">
+<style>
+body { margin: 0; }
+.clipped {
+  background-color: green;
+  border: 5px solid red;
+  -webkit-clip-path: url(#c);
+  clip-path: url(#c);
+}
+</style>
+<div style="columns: 2; column-gap: 0; width: 200px; height: 100px">
+  <div style="height: 100px"></div>
+  <div style="height: 90px" class="clipped"></div>
+</div>
+<svg>
+  <clipPath id="c" clipPathUnits="userSpaceOnUse">
+    <rect x="5" y="5" width="90" height="90"/>
+  </clipPath>
+</svg>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-mutated.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-mutated.html
new file mode 100644
index 00000000000..09642853c77
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-mutated.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>CSS Masking: SVG clipPath dynamically updated.</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="match" href="reference/reference-mutated-ref.html">
+<meta name="assert" content="Test ensures that SVG clipPath updates properly when dynamically changed."/>
+
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/rendering-utils.js"></script>
+
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  clip-path: url(#clip);
+}
+</style>
+<div id="target"></div>
+<svg height="0" width="0">
+  <defs>
+    <clipPath id="clip" clipPathUnits="objectBoundingBox">
+      <circle cx="0.5" cy="0.5" r="0.25"></circle>
+    </clipPath>
+  </defs>
+</svg>
+<script>
+waitForAtLeastOneFrame().then(function() {
+  document.querySelector('circle').setAttribute('r', 1);
+  takeScreenshot();
+});
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-nonexisting-existing-local.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-nonexisting-existing-local.html
new file mode 100644
index 00000000000..d02e1439e64
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference-nonexisting-existing-local.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>CSS Masking: fragment of non valid URL as clip.</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
+<link rel="match" href="reference/reference-nonexisting-existing-local-ref.html">
+<meta name="assert" content="Test ensures that only local URLs with a valid fragment result in a valid clip."/>
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  clip-path: url(notexisting.svg#c);
+}
+</style>
+<div style="background-color: red; width: 100px">
+  <div id="target"></div>
+</div>
+<svg>
+  <clipPath id="c" clipPathUnits="objectBoundingBox">
+    <circle cx="0.5" cy="0.5" r="0.5"/>
+  </clipPath>
+</svg>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-columns-shape-002-ref.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-columns-shape-002-ref.html
new file mode 100644
index 00000000000..4337cdf6375
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/clip-path-columns-shape-002-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<body style="margin: 0">
+  <div style="width: 90px; height: 90px; margin-left: 105px; margin-top: 5px; background-color: green"></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-mutated-ref.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-mutated-ref.html
new file mode 100644
index 00000000000..f718ea6abfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-mutated-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="width: 100px; height: 100px; background-color: green"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-nonexisting-existing-local-ref.html b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-nonexisting-existing-local-ref.html
new file mode 100644
index 00000000000..f718ea6abfb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-masking/clip-path/reference/reference-nonexisting-existing-local-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="width: 100px; height: 100px; background-color: green"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003-ref.html
new file mode 100644
index 00000000000..9dfc24c526b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    border: 1px solid green;
+    background: green;
+    margin-top: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003.html
new file mode 100644
index 00000000000..d5da92db4f3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-abspos-cb-003.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: backdrop-filter should generate a containing block for absolute positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="will-change-abspos-cb-003-ref.html">
+<style>
+  .container {
+    border: 1px solid green;
+    background: red;
+    width: 100px;
+    height: 100px;
+    margin-top: 100px;
+    will-change: backdrop-filter;
+  }
+  .abspos {
+    position: absolute;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<div class="container">
+  <div class="abspos"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004-ref.html
new file mode 100644
index 00000000000..9dfc24c526b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    border: 1px solid green;
+    background: green;
+    margin-top: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004.html
new file mode 100644
index 00000000000..7bc5d923362
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-004.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: backdrop-filter should generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-004-ref.html">
+<style>
+  .container {
+    border: 1px solid green;
+    background: red;
+    width: 100px;
+    height: 100px;
+    margin-top: 100px;
+    will-change: backdrop-filter;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<div class="container">
+  <div class="fixedpos"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005-ref.html
new file mode 100644
index 00000000000..7823c16075e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005-ref.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    background: green;
+    margin-left: 100px;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005.html
new file mode 100644
index 00000000000..7cd88bd3778
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-005.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: backdrop-filter on an inline should generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-005-ref.html">
+<style>
+  .inline {
+    margin-left: 100px;
+    will-change: backdrop-filter;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 0;
+    left: 0;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<span class="inline">
+  <!-- "FAIL" should be hidden by the green box and should not be visible. -->
+  FAIL
+  <div class="fixedpos"></div>
+</span>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006-ref.html
new file mode 100644
index 00000000000..05957327c33
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006-ref.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  body {
+    margin: 0;
+  }
+  .hidden {
+    width: 100px;
+    height: 100px;
+    margin-left: 100px;
+    margin-top: 200px;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 100px;
+    left: 100px;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+  .spacer {
+    height: 2000px;
+  }
+</style>
+<div class="hidden"></div>
+<div class="fixedpos"></div>
+<div class="spacer"></div>
+<script>
+  window.onload = function() { window.scrollTo(0, 100); };
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006.html
new file mode 100644
index 00000000000..ec9eaa409f4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-006.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: backdrop-filter on the root should not generate a containing block for fixed positioned elements.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="will-change-fixedpos-cb-006-ref.html">
+<style>
+  html {
+    will-change: backdrop-filter;
+  }
+  body {
+    margin: 0;
+  }
+  .hidden {
+    width: 100px;
+    height: 100px;
+    background: red;
+    margin-left: 100px;
+    margin-top: 200px;
+  }
+  .fixedpos {
+    position: fixed;
+    top: 100px;
+    left: 100px;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+  .spacer {
+    height: 2000px;
+  }
+</style>
+<!-- This object should be fully hidden by the fixed position object. -->
+<div class="hidden"></div>
+<div class="fixedpos"></div>
+<div class="spacer"></div>
+<script>
+  window.onload = function() { window.scrollTo(0, 100); };
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002-ref.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002-ref.html
new file mode 100644
index 00000000000..38138ebcac3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002-ref.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+  div {
+    background: green;
+    width: 100px;
+    height: 100px;
+  }
+</style>
+<div></div>
diff --git a/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002.html b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002.html
new file mode 100644
index 00000000000..1cda23b9bcf
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-will-change/will-change-stacking-context-002.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test: will-change: backdrop-filter should create a stacking context.</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=960953">
+<link rel="help" href="https://drafts.csswg.org/css-will-change/#will-change">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
+<link rel="match" href="will-change-stacking-context-002-ref.html">
+<style>
+  .indicator {
+    position: absolute;
+    background-color: green;
+    z-index: 1;
+  }
+  .willchange {
+    will-change: backdrop-filter;
+    z-index: 0;
+  }
+  .child {
+    position: relative;
+    background-color: red;
+    z-index: 2;
+  }
+  .box {
+    width: 100px;
+    height: 100px;
+  }
+</style>
+
+<div class="indicator box"></div>
+<div class="willchange box">
+  <!-- Because will-change: backdrop-filter creates a stacking context, this
+       child remains on bottom even though it has a higher z-index than the
+       indicator box. -->
+  <div class="child box"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/clip-under-filter-003.html b/tests/wpt/web-platform-tests/css/filter-effects/clip-under-filter-003.html
new file mode 100644
index 00000000000..2cfda2a0d3b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/clip-under-filter-003.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS filter : Clipping on descendant of filter element</title>
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#funcdef-filter-opacity">
+<link rel="help" href="https://crbug.com/734116">
+<link rel="help" href="https://crbug.com/747511">
+<link rel="match" href="reference/clip-under-filter-003-ref.html">
+<meta name="assert" content="This test ensures that overflow clip correctly applies to children in the presence of a filter on the same element"/>
+<div style="position:relative; width:100px; height:100px; border:5px dashed black; background:green; overflow:hidden; filter:opacity(1);">
+  <div style="margin-left:-5px; margin-top:-5px; width:100px; height:100px; border:5px solid red;"></div>
+</div>
+This test verifies overflow clip correctly applies to children in the presence of a filter on the same element.<br/>
+It succeeds if a green box with dashed black border is shown. No red border should be visible.
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/filter-region-transformed-composited-child-001.html b/tests/wpt/web-platform-tests/css/filter-effects/filter-region-transformed-composited-child-001.html
new file mode 100644
index 00000000000..c6bef8adf73
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/filter-region-transformed-composited-child-001.html
@@ -0,0 +1,51 @@
+<title>CSS Filters: filtered parent with composited or transformed child</title>
+<link rel="author" title="Stephen White" href="mailto:senorblanco@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterProperty">
+<link rel="help" href="https://drafts.fxtf.org/filter-effects/#feComponentTransferElement">
+<link rel="issue" href="https://bugs.chromium.org/p/chromium/issues/detail?id=618642">
+<link rel="issue" href="https://bugs.chromium.org/p/chromium/issues/detail?id=620394">
+<link rel="match" href="reference/filter-region-transformed-composited-child-001-ref.html">
+<meta name="assert" content="This test ensures that filtered parent works correctly with composited or transformed children.">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="0" height="0">
+  <defs>
+    <filter id="filter" x="25%" y="0%" width="50%" height="100%">
+      <feComponentTransfer>
+        <feFuncR type="linear" intercept="0" slope="1"/>
+        <feFuncG type="linear" intercept="0" slope="0"/>
+        <feFuncB type="linear" intercept="0" slope="0"/>
+        <feFuncA type="linear" intercept="0" slope="1"/>
+      </feComponentTransfer>
+    </filter>
+  </defs>
+</svg>
+<style>
+div {
+    position: absolute;
+}
+.filtered {
+    filter: url(#filter);
+}
+.child {
+    background-color: gray;
+    width: 50px;
+    height: 50px;
+    position: absolute;
+    will-change: transform;
+}
+.p1 {
+    left: 50px;
+    top: 50px;
+}
+.c1 {
+    transform: translate(0px, 25px);
+}
+.p2 {
+    left: 150px;
+    top: 50px;
+}
+.c2 {
+    transform: translate(0px, -25px);
+}
+</style>
+<div class="filtered p1"><div class="child c1"></div></div>
+<div class="filtered p2"><div class="child c2"></div></div>
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/reference/clip-under-filter-003-ref.html b/tests/wpt/web-platform-tests/css/filter-effects/reference/clip-under-filter-003-ref.html
new file mode 100644
index 00000000000..e60456b3058
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/reference/clip-under-filter-003-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<div style="width:100px; height:100px; border:5px dashed black; background:green;">
+</div>
+This test verifies overflow clip correctly applies to children in the presence of a filter on the same element.<br/>
+It succeeds if a green box with dashed black border is shown. No red border should be visible.
diff --git a/tests/wpt/web-platform-tests/css/filter-effects/reference/filter-region-transformed-composited-child-001-ref.html b/tests/wpt/web-platform-tests/css/filter-effects/reference/filter-region-transformed-composited-child-001-ref.html
new file mode 100644
index 00000000000..1a8ab40d201
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/filter-effects/reference/filter-region-transformed-composited-child-001-ref.html
@@ -0,0 +1,34 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="0" height="0">
+  <defs>
+    <filter id="filter" x="25%" y="0%" width="50%" height="100%">
+      <feComponentTransfer>
+        <feFuncR type="linear" intercept="0" slope="1"/>
+        <feFuncG type="linear" intercept="0" slope="0"/>
+        <feFuncB type="linear" intercept="0" slope="0"/>
+        <feFuncA type="linear" intercept="0" slope="1"/>
+      </feComponentTransfer>
+    </filter>
+  </defs>
+</svg>
+<style>
+div {
+    position: absolute;
+    filter: url(#filter);
+    background-color: gray;
+    width: 50px;
+    height: 50px;
+    will-change: transform;
+}
+.p1 {
+    left: 50px;
+    top: 50px;
+    transform: translate(0px, 25px);
+}
+.p2 {
+    left: 150px;
+    top: 50px;
+    transform: translate(0px, -25px);
+}
+</style>
+<div class="p1"></div>
+<div class="p2"></div>
diff --git a/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html b/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html
index d5f4adff59f..dfd5c374db4 100644
--- a/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html
+++ b/tests/wpt/web-platform-tests/dom/nodes/aria-attribute-reflection.tentative.html
@@ -360,13 +360,24 @@ test(function(t) {
 }, "aria-rowspan attribute reflects.");
 </script>
 
+<div id="selected" aria-selected="true"></div>
+
+<script>
+test(function(t) {
+    var element = document.getElementById("selected");
+    assert_equals(element.ariaSelected, "true");
+    element.ariaSelected = "false";
+    assert_equals(element.getAttribute("aria-selected"), "false");
+}, "aria-selected attribute reflects.");
+</script>
+
 <div id="setsize" aria-setsize="10"></div>
 
 <script>
 test(function(t) {
     var element = document.getElementById("setsize");
-    assert_equals(element.ariaSelected, "10");
-    element.ariaSelected = "11";
+    assert_equals(element.ariaSetSize, "10");
+    element.ariaSetSize = "11";
     assert_equals(element.getAttribute("aria-setsize"), "11");
 }, "aria-setsize attribute reflects.");
 </script>
diff --git a/tests/wpt/web-platform-tests/generic-sensor/resources/generic-sensor-helpers.js b/tests/wpt/web-platform-tests/generic-sensor/resources/generic-sensor-helpers.js
index ad11e58c717..aff6d172d46 100644
--- a/tests/wpt/web-platform-tests/generic-sensor/resources/generic-sensor-helpers.js
+++ b/tests/wpt/web-platform-tests/generic-sensor/resources/generic-sensor-helpers.js
@@ -100,29 +100,3 @@ function verifyGeoSensorReading(pattern, {latitude, longitude, altitude,
 function verifyProximitySensorReading(pattern, {distance, max, near, timestamp}, isNull) {
   return verifySensorReading(pattern, [distance, max, near], timestamp, isNull);
 }
-
-// A "sliding window" that iterates over |data| and returns one item at a
-// time, advancing and wrapping around as needed. |data| must be an array of
-// arrays.
-class RingBuffer {
-  constructor(data) {
-    this.bufferPosition_ = 0;
-    // Validate |data|'s format and deep-copy every element.
-    this.data_ = Array.from(data, element => {
-      if (!Array.isArray(element)) {
-        throw new TypeError('Every |data| element must be an array.');
-      }
-      return Array.from(element);
-    })
-  }
-
-  next() {
-    const value = this.data_[this.bufferPosition_];
-    this.bufferPosition_ = (this.bufferPosition_ + 1) % this.data_.length;
-    return { done: false, value: value };
-  }
-
-  [Symbol.iterator]() {
-    return this;
-  }
-}
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html b/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html
new file mode 100644
index 00000000000..6e1573cd645
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<div id=log></div>
+<script>
+async_test(t => {
+  const frame = document.body.appendChild(document.createElement("iframe"));
+  t.add_cleanup(() => frame.remove());
+  frame.src = get_host_info().HTTP_NOTSAMESITE_ORIGIN + new URL("resources/iframe.html", location).pathname;
+  window.onmessage = t.step_func_done(({ data }) => {
+    assert_equals(data, "success");
+  });
+  frame.onload = t.step_func(() => {
+    frame.contentWindow.postMessage("parent.postMessage('success', '*');", "*");
+  });
+}, "COEP requires a secure context");
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html.headers b/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html.headers
new file mode 100644
index 00000000000..6604450991a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-embedder-policy/no-secure-context.html.headers
@@ -0,0 +1 @@
+Cross-Origin-Embedder-Policy: require-corp
diff --git a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/blob-data.https.html b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/blob-data.https.html
index b35d8c2798a..8fe2ee46cb3 100644
--- a/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/blob-data.https.html
+++ b/tests/wpt/web-platform-tests/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/blob-data.https.html
@@ -16,7 +16,7 @@ promise_test(t => {
 `;
 }
 
-function dataWorkerIncrementerTest(name, origin = "null") {
+function blobWorkerIncrementerTest(name, origin = "null") {
   return `
 promise_test(t => {
   const worker = new Worker(URL.createObjectURL(new Blob([\`
@@ -71,7 +71,7 @@ importScripts("${url.href}resources/test-incrementer.js");
 
 ${httpWorkerIncrementerTest("blob worker")}
 
-${dataWorkerIncrementerTest("blob worker", self.location.origin)}
+${blobWorkerIncrementerTest("blob worker", self.location.origin)}
 
 ${propertyTests("blob worker")}
 
@@ -87,7 +87,7 @@ const frameScript = `
 <script>
 ${httpWorkerIncrementerTest("blob frame")}
 
-${dataWorkerIncrementerTest("blob frame", self.location.origin)}
+${blobWorkerIncrementerTest("blob frame", self.location.origin)}
 
 ${propertyTests("blob frame")}
 <\/script>
@@ -99,11 +99,11 @@ frame.style = "display:none";
 fetch_tests_from_window(frame.contentWindow);
 
 const dataWorkerScript = `
-importScripts("${url.origin}/resources/testharness.js");
+importScripts("${url.origin}/resources/testharness.js?pipe=header(Cross-Origin-Resource-Policy,cross-origin)");
 
 // Cannot use httpWorkerIncrementerTest() here as the HTTP URL is not same origin.
 
-${dataWorkerIncrementerTest("data worker")}
+${blobWorkerIncrementerTest("data worker")}
 
 ${propertyTests("data worker")}
 
@@ -114,11 +114,11 @@ fetch_tests_from_worker(new Worker(`data:,${dataWorkerScript}`));
 
 const dataFrameScript = `
 <!doctype html>
-<script src=${url.origin}/resources/testharness.js><\/script>
+<script src=${url.origin}/resources/testharness.js?pipe=header(Cross-Origin-Resource-Policy,cross-origin)><\/script>
 <script>
 // Cannot use httpWorkerIncrementerTest() here as the HTTP URL is not same origin.
 
-${dataWorkerIncrementerTest("data frame")}
+${blobWorkerIncrementerTest("data frame")}
 
 ${propertyTests("data frame")}
 <\/script>
diff --git a/tests/wpt/web-platform-tests/interfaces/appmanifest.idl b/tests/wpt/web-platform-tests/interfaces/appmanifest.idl
index 35c491a5f7b..2adc3700124 100644
--- a/tests/wpt/web-platform-tests/interfaces/appmanifest.idl
+++ b/tests/wpt/web-platform-tests/interfaces/appmanifest.idl
@@ -3,26 +3,6 @@
 // (https://github.com/tidoust/reffy-reports)
 // Source: Web App Manifest (https://w3c.github.io/manifest/)
 
-[Exposed=Window]
-interface BeforeInstallPromptEvent : Event {
-  constructor(DOMString type, optional EventInit eventInitDict = {});
-  Promise<PromptResponseObject> prompt();
-};
-
-dictionary PromptResponseObject {
-  AppBannerPromptOutcome userChoice;
-};
-
-enum AppBannerPromptOutcome {
-  "accepted",
-  "dismissed"
-};
-
-partial interface Window {
-  attribute EventHandler onappinstalled;
-  attribute EventHandler onbeforeinstallprompt;
-};
-
 dictionary WebAppManifest {
    TextDirectionType dir = "auto";
    DOMString lang;
diff --git a/tests/wpt/web-platform-tests/interfaces/video-raf.idl b/tests/wpt/web-platform-tests/interfaces/video-rvfc.idl
similarity index 96%
rename from tests/wpt/web-platform-tests/interfaces/video-raf.idl
rename to tests/wpt/web-platform-tests/interfaces/video-rvfc.idl
index 25f9e3a3ba6..a86e2b364df 100644
--- a/tests/wpt/web-platform-tests/interfaces/video-raf.idl
+++ b/tests/wpt/web-platform-tests/interfaces/video-rvfc.idl
@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into reffy-reports
 // (https://github.com/tidoust/reffy-reports)
-// Source: HTMLVideoElement.requestVideoFrameCallback() (https://wicg.github.io/video-raf/)
+// Source: HTMLVideoElement.requestVideoFrameCallback() (https://wicg.github.io/video-rvfc/)
 
 dictionary VideoFrameMetadata {
   required DOMHighResTimeStamp presentationTime;
diff --git a/tests/wpt/web-platform-tests/lint.whitelist b/tests/wpt/web-platform-tests/lint.whitelist
index bd5a5d5c172..526d6b765bd 100644
--- a/tests/wpt/web-platform-tests/lint.whitelist
+++ b/tests/wpt/web-platform-tests/lint.whitelist
@@ -300,6 +300,7 @@ SET TIMEOUT: html/cross-origin-embedder-policy/resources/navigate-require-corp.s
 SET TIMEOUT: html/cross-origin-embedder-policy/resources/navigate-require-corp-same-site.sub.html
 SET TIMEOUT: html/dom/documents/dom-tree-accessors/Document.currentScript.html
 SET TIMEOUT: html/webappapis/timers/*
+SET TIMEOUT: orientation-event/resources/orientation-event-helpers.js
 SET TIMEOUT: portals/history/resources/portal-harness.js
 SET TIMEOUT: resources/chromium/*
 SET TIMEOUT: resources/test/tests/functional/add_cleanup.html
@@ -703,6 +704,7 @@ MISSING DEPENDENCY: shape-detection/resources/shapedetection-helpers.js
 MISSING DEPENDENCY: webxr/resources/webxr_util.js
 MISSING DEPENDENCY: contacts/resources/helpers.js
 MISSING DEPENDENCY: generic-sensor/resources/generic-sensor-helpers.js
+MISSING DEPENDENCY: orientation-event/resources/orientation-event-helpers.js
 
 # Tests that are false positives for using Ahem as a system font
 AHEM SYSTEM FONT: acid/acid3/test.html
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.html b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.html
index 1f9b956f6f0..f730235e0e2 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.html
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.html
@@ -20,10 +20,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100em';
-offscreenCanvas.height = '100em';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100em'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.worker.js b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.worker.js
index 3d69bcb3752..1755fcb2f3a 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.worker.js
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.em.worker.js
@@ -16,10 +16,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100em';
-offscreenCanvas.height = '100em';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100em'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.html b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.html
index 6411c3006fb..0cd4d6c6549 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.html
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.html
@@ -20,10 +20,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '#!?';
-offscreenCanvas.height = '#!?';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 50, "offscreenCanvas.height", "50");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '#!?'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.worker.js b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.worker.js
index 5ba9fdb3632..9251eed89d3 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.worker.js
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.junk.worker.js
@@ -16,10 +16,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '#!?';
-offscreenCanvas.height = '#!?';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 50, "offscreenCanvas.height", "50");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '#!?'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.html b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.html
index 091d6947c8b..f05eef206f6 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.html
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.html
@@ -20,10 +20,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '-100';
-offscreenCanvas.height = '-100';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 50, "offscreenCanvas.height", "50");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '-100'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.worker.js b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.worker.js
index 9d123275bbb..0c8cc06ee59 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.worker.js
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.minus.worker.js
@@ -16,10 +16,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '-100';
-offscreenCanvas.height = '-100';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 50, "offscreenCanvas.height", "50");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '-100'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.html b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.html
index ba119ef94c2..593781f32b7 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.html
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.html
@@ -20,10 +20,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100%';
-offscreenCanvas.height = '100%';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100%'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.worker.js b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.worker.js
index 76ce6da7a52..e4da8ef5aae 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.worker.js
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.percent.worker.js
@@ -16,10 +16,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100%';
-offscreenCanvas.height = '100%';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100%'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.html b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.html
index 964c8703755..46a87a6a6fc 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.html
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.html
@@ -20,10 +20,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100#!?';
-offscreenCanvas.height = '100#!?';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100#!?'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.worker.js b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.worker.js
index a8169639f01..e1cfb28127e 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.worker.js
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/the-offscreen-canvas/size.attributes.parse.trailingjunk.worker.js
@@ -16,10 +16,7 @@ t.step(function() {
 var offscreenCanvas = new OffscreenCanvas(100, 50);
 var ctx = offscreenCanvas.getContext('2d');
 
-offscreenCanvas.width = '100#!?';
-offscreenCanvas.height = '100#!?';
-_assertSame(offscreenCanvas.width, 100, "offscreenCanvas.width", "100");
-_assertSame(offscreenCanvas.height, 100, "offscreenCanvas.height", "100");
+assert_throws_js(TypeError, function() { offscreenCanvas.width = '100#!?'; });
 t.done();
 
 });
diff --git a/tests/wpt/web-platform-tests/offscreen-canvas/tools/tests2d.yaml b/tests/wpt/web-platform-tests/offscreen-canvas/tools/tests2d.yaml
index 4ff765bdd79..f4a605c0eca 100644
--- a/tests/wpt/web-platform-tests/offscreen-canvas/tools/tests2d.yaml
+++ b/tests/wpt/web-platform-tests/offscreen-canvas/tools/tests2d.yaml
@@ -9783,15 +9783,15 @@
         ("space", "  100", 100),
         ("whitespace", "\t\f100", 100),
         ("plus", "+100", 100),
-        ("minus", "-100", None),
+        ("minus", "-100", "exception"),
         ("octal", "0100", 100),
         ("hex", "0x100", 0x100),
         ("exp", "100e1", 100e1),
         ("decimal", "100.999", 100),
-        ("percent", "100%", 100),
-        ("em", "100em", 100),
-        ("junk", "#!?", None),
-        ("trailingjunk", "100#!?", 100),
+        ("percent", "100%", "exception"),
+        ("em", "100em", "exception"),
+        ("junk", "#!?", "exception"),
+        ("trailingjunk", "100#!?", "exception"),
     ]
     def gen(name, string, exp, code):
         testing = ["size.nonnegativeinteger"]
@@ -9800,6 +9800,9 @@
             code += "offscreenCanvas.width = '%s';\noffscreenCanvas.height = '%s';\n" % (string, string)
             code += "@assert offscreenCanvas.width === 100;\n@assert offscreenCanvas.height === 50;\n"
             expected = None
+        elif exp == "exception":
+            code += "@assert throws TypeError offscreenCanvas.width = '%s';\n" % string
+            expected = None
         else:
             code += "offscreenCanvas.width = '%s';\noffscreenCanvas.height = '%s';\n" % (string, string)
             code += "@assert offscreenCanvas.width === %s;\n@assert offscreenCanvas.height === %s;\n" % (exp, exp)
diff --git a/tests/wpt/web-platform-tests/orientation-event/README.md b/tests/wpt/web-platform-tests/orientation-event/README.md
new file mode 100644
index 00000000000..14ea2f51173
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/README.md
@@ -0,0 +1,8 @@
+The `resources/orientation-event-helpers.js` tests depend on the implementation of
+the `GenericSensorTest` interface which is defined in [README.md](../generic-sensor/README.md).
+
+The Chromium implementation of the `GenericSensorTest` interface is located in
+[generic_sensor_mocks.js](../resources/chromium/generic_sensor_mocks.js).
+
+Other browser vendors should provide their own implementations of
+the `GenericSensorTest` interface.
diff --git a/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-of-detached-documents.https.html b/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-of-detached-documents.https.html
new file mode 100644
index 00000000000..c7ad5ecaefe
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-of-detached-documents.https.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>Device sensor event listeners for `window` of detached documents.</title>
+<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/orientation-event-helpers.js"></script>
+<script>
+
+sensor_test(async t => {
+  const childFrame = document.createElement('iframe');
+  childFrame.src = "/common/blank.html";
+  document.body.append(childFrame);
+
+  const childLoadWatcher = new EventWatcher(t, childFrame, ["load"]);
+  await childLoadWatcher.wait_for("load");
+
+  const contentWindow = childFrame.contentWindow;
+  const contentDocument = childFrame.contentDocument;
+
+  document.body.remove(childFrame);
+
+  assert_not_equals(contentWindow, null);
+  assert_not_equals(contentDocument, null);
+  assert_equals(contentDocument.defaultView, null);
+
+  contentWindow.addEventListener("devicemotion", () => {});
+  contentWindow.addEventListener("deviceorientation", () => {});
+  contentWindow.addEventListener("deviceorientationabsolute", () => {});
+
+}, 'Adding an event listener on the window of a detached document does not crash.');
+
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html b/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html
new file mode 100644
index 00000000000..3af5e924177
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>Device Sensor Events not exposed to insecure origins</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/orientation-event-helpers.js"></script>
+<script>
+
+function waitForLackOfEvent(t, eventName) {
+  return new Promise(async (resolve, reject) => {
+    window.addEventListener(eventName, reject);
+    await new Promise(r => t.step_timeout(r, 1000));
+    window.removeEventListener(eventName, reject);
+    resolve();
+  });
+}
+
+if (window.location.origin != get_host_info().HTTP_ORIGIN) {
+  window.location = get_host_info().HTTP_ORIGIN + window.location.pathname;
+  promise_test(_ => new Promise(_ => {}), "Stall tests on the wrong host.");
+} else {
+  test(() => {
+    assert_false('DeviceMotionEvent' in window);
+    assert_false('DeviceOrientationEvent' in window);
+    assert_false('DeviceOrientationAbsoluteEvent' in window);
+    assert_false('DeviceMotionEventAcceleration' in window);
+    assert_false('DeviceMotionEventRotationRate' in window);
+    assert_false('ondevicemotion' in window);
+    assert_false('ondeviceorientation' in window);
+    assert_false('ondeviceorientationabsolute' in window);
+  }, 'Event interfaces and event handlers are not exposed on `window`.');
+
+  sensor_test(async (t, sensorProvider) => {
+    const FAKE_ACCELERATION_DATA = [1, 2, 3];
+    const FAKE_LINEAR_ACCELERATION_DATA = [4, 5, 6];
+    const FAKE_GYROSCOPE_DATA = [7, 8, 9];
+    setMockSensorDataForType(sensorProvider, 'Accelerometer', FAKE_ACCELERATION_DATA);
+    setMockSensorDataForType(sensorProvider, 'LinearAccelerationSensor', FAKE_LINEAR_ACCELERATION_DATA);
+    setMockSensorDataForType(sensorProvider, 'Gyroscope', FAKE_GYROSCOPE_DATA);
+
+    return waitForLackOfEvent(t, 'devicemotion');
+  }, 'addEventListener() for `devicemotion` does not crash but the handler never fires.');
+
+  sensor_test(async (t, sensorProvider) => {
+    const FAKE_ORIENTATION_DATA = [1.1, 2.2, 3.3];
+    setMockSensorDataForType(sensorProvider, 'RelativeOrientationEulerAngles', FAKE_ORIENTATION_DATA);
+
+    return waitForLackOfEvent(t, 'deviceorientation');
+  }, 'addEventListener() for `deviceorientation` does not crash but the handler never fires.');
+
+  sensor_test(async (t, sensorProvider) => {
+    const FAKE_ORIENTATION_DATA = [1.1, 2.2, 3.3];
+    setMockSensorDataForType(sensorProvider, 'AbsoluteOrientationEulerAngles', FAKE_ORIENTATION_DATA);
+
+    return waitForLackOfEvent(t, 'deviceorientationabsolute');
+  }, 'addEventListener() for `deviceorientationabsolute` does not crash but the handler never fires.');
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/devicemotionevent-init.https.html b/tests/wpt/web-platform-tests/orientation-event/devicemotionevent-init.https.html
deleted file mode 100644
index 90563d8bbae..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/devicemotionevent-init.https.html
+++ /dev/null
@@ -1,49 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>DeviceMotionEvent attributes must be initialized properly</title>
-    <meta charset='utf-8'>
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-  </head>
-  <body>
-    <p>DeviceOrientationEvent attributes must be initialized properly.</p>
-    <div id="log"></div>
-    <script>
-      test(function() {
-        var evt = new DeviceMotionEvent("foo");
-        assert_equals(evt.type, "foo", "type is set to \"foo\"");
-        assert_equals(evt.acceleration, null,
-          "acceleration must be initialized to null");
-        assert_equals(evt.accelerationIncludingGravity, null,
-          "accelerationIncludingGravity must be initialized to null");
-        assert_equals(evt.rotationRate, null,
-          "rotationRate must be initialized to null");
-        assert_equals(evt.interval, 0, "interval must be initialized to 0");
-      }, "User created event is initialized properly with default values");
-
-      test(function() {
-        var evt = new DeviceMotionEvent("foo", {
-          acceleration: { x: 56, y: -56, z: 64 },
-          accelerationIncludingGravity: { x: 56, y: -56, z: 64 },
-          rotationRate: { alpha: 56, beta: -56, gamma: 64 },
-          interval: 3
-        });
-        assert_equals(evt.type, "foo", "type is set to \"foo\"");
-        assert_equals(typeof evt.acceleration, "object", "acceleration is an object");
-        assert_equals(evt.acceleration.x, 56, "acceleration.x is set to 56");
-        assert_equals(evt.acceleration.y, -56, "acceleration.y is set to -56");
-        assert_equals(evt.acceleration.z, 64, "acceleration.z is set to 64");
-        assert_equals(typeof evt.accelerationIncludingGravity, "object", "accelerationIncludingGravity is an object");
-        assert_equals(evt.accelerationIncludingGravity.x, 56, "accelerationIncludingGravity.x is set to 56");
-        assert_equals(evt.accelerationIncludingGravity.y, -56, "accelerationIncludingGravity.y is set to -56");
-        assert_equals(evt.accelerationIncludingGravity.z, 64, "accelerationIncludingGravity.z is set to 64");
-        assert_equals(typeof evt.rotationRate, "object", "rotationRate is an object");
-        assert_equals(evt.rotationRate.alpha, 56, "rotationRate.alpha is set to 56");
-        assert_equals(evt.rotationRate.beta, -56, "rotationRate.beta is set to -56");
-        assert_equals(evt.rotationRate.gamma, 64, "rotationRate.gamma is set to 64");
-        assert_equals(evt.interval, 3, "interval is set to 3");
-      }, "User created event is initialized properly using dictionary");
-    </script>
-  </body>
-</html>
diff --git a/tests/wpt/web-platform-tests/orientation-event/deviceorientationabsoluteevent.https.html b/tests/wpt/web-platform-tests/orientation-event/deviceorientationabsoluteevent.https.html
index 8ccf671cb3b..8371098a194 100644
--- a/tests/wpt/web-platform-tests/orientation-event/deviceorientationabsoluteevent.https.html
+++ b/tests/wpt/web-platform-tests/orientation-event/deviceorientationabsoluteevent.https.html
@@ -16,6 +16,7 @@
         if (!run) {
           run = true;
           t.step(function () {
+            assert_true(e instanceof DeviceOrientationEvent, "instanceof DeviceOrientationEvent");
             assert_equals(e.type, "deviceorientationabsolute", "type is set to \"deviceorientationabsolute\"");
             assert_equals(e.alpha, null, "alpha is set to null");
             assert_equals(e.beta, null, "beta is set to null");
diff --git a/tests/wpt/web-platform-tests/orientation-event/deviceorientationevent-init.https.html b/tests/wpt/web-platform-tests/orientation-event/deviceorientationevent-init.https.html
deleted file mode 100644
index b6485f696b4..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/deviceorientationevent-init.https.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>DeviceOrientationEvent attributes must be initialized properly</title>
-    <meta charset='utf-8'>
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-  </head>
-  <body>
-    <p>DeviceOrientationEvent attributes must be initialized properly.</p>
-    <div id="log"></div>
-    <script>
-      test(function() {
-        var evt = new DeviceOrientationEvent("foo");
-        assert_equals(evt.type, "foo", "type is set to \"foo\"");
-        assert_equals(evt.alpha, null, "alpha is set to null");
-        assert_equals(evt.beta, null, "beta is set to null");
-        assert_equals(evt.gamma, null, "gamma is set to null");
-        assert_false(evt.absolute, "absolute is set to false");
-      }, "User created event is initialized properly with default values");
-
-      test(function() {
-        var evt = new DeviceOrientationEvent("foo", {
-          alpha: 56,
-          beta: -56,
-          gamma: 64,
-          absolute: true
-        });
-        assert_equals(evt.type, "foo", "type is set to \"foo\"");
-        assert_equals(evt.alpha, 56, "alpha is set to 56");
-        assert_equals(evt.beta, -56, "beta is set to -56");
-        assert_equals(evt.gamma, 64, "gamma is set to 64");
-        assert_true(evt.absolute, "absolute is set to true");
-      }, "User created event is initialized properly using a dictionary");
-    </script>
-  </body>
-</html>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/add-during-dispatch.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/add-during-dispatch.https.html
new file mode 100644
index 00000000000..d40b557a2d6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/add-during-dispatch.https.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const motionData = generateMotionData(1, 2, 3,
+                                        4, 5, 6,
+                                        7, 8, 9);
+  setMockMotionData(sensorProvider, motionData);
+  waitForMotion(motionData);
+
+  return new Promise((resolve, reject) => {
+    let result = reject;
+    window.addEventListener('devicemotion', event => result());
+    result = resolve;
+  });
+}, 'Test no fire listeners added during event dispatch.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/add-listener-from-callback.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/add-listener-from-callback.https.html
new file mode 100644
index 00000000000..11f2695794c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/add-listener-from-callback.https.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const motionData = generateMotionData(1.1, 2.1, 3.1,
+                                        1.2, 2.2, 3.2,
+                                        1.3, 2.3, 3.3);
+
+  let firstListener = null;
+  let secondListener = null;
+  let firstEventCount = 0;
+  let firstPromise = new Promise(resolve => {
+    firstListener = (event) => {
+      assert_true(event instanceof DeviceMotionEvent, 'event is DeviceMotionEvent');
+      assert_equals(event.type, 'devicemotion', 'event.type is devicemotion');
+      assert_true(event.target instanceof Window, 'event is fired on the window object');
+      checkMotion(event, motionData);
+      window.removeEventListener('devicemotion', firstListener);
+      if (++firstEventCount == 1) {
+        window.addEventListener('devicemotion', secondListener);
+      }
+      resolve(event);
+    };
+  });
+
+  let secondEventCount = 0;
+  let secondPromise = new Promise(resolve => {
+    secondListener = (event) => {
+      checkMotion(event, motionData);
+      window.removeEventListener('devicemotion', secondListener);
+      ++secondEventCount;
+      resolve(event);
+    };
+  });
+
+  setMockMotionData(sensorProvider, motionData);
+  window.addEventListener('devicemotion', firstListener);
+  await firstPromise;
+  await secondPromise;
+  assert_equals(firstEventCount, 1, "Too many events fired for the first listener");
+  assert_equals(secondEventCount, 1, "Too many events fired for the second listener");
+}, 'Tests that adding a new devicemotion event listener from a callback works as expected.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/create-event.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/create-event.https.html
new file mode 100644
index 00000000000..7efcf40155b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/create-event.https.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+test(test => {
+  const event = document.createEvent('DeviceMotionEvent');
+  const newEvent = new CustomEvent("devicemotion", {
+      bubbles: false, cancelable: false,
+      acceleration: {x:1.5,y:2.5,z:3.5},
+      accelerationIncludingGravity: {x:4.5,y:5.5,z:6.5},
+      rotationRate: {alpha:7.5,beta:8.5,gamma:9.5},
+      interval: 0.5
+  });
+
+  assert_equals(typeof event, 'object');
+  assert_equals(event.__proto__, DeviceMotionEvent.prototype);
+
+  assert_true('type' in event);
+  assert_true('bubbles' in event);
+  assert_true('cancelable' in event);
+  assert_true('acceleration' in event);
+  assert_true('accelerationIncludingGravity' in event);
+  assert_true('rotationRate' in event);
+  assert_true('interval' in event);
+
+  assert_equals(typeof newEvent.type, 'string');
+  assert_equals(newEvent.type, "devicemotion");
+  assert_equals(typeof newEvent.bubbles, 'boolean');
+  assert_false(event.bubbles);
+  assert_false(newEvent.bubbles);
+  assert_equals(typeof newEvent.cancelable, 'boolean');
+  assert_false(event.cancelable);
+  assert_false(newEvent.cancelable);
+  assert_equals(typeof event.acceleration, 'object');
+  assert_equals(typeof event.accelerationIncludingGravity, 'object');
+  assert_equals(typeof event.rotationRate, 'object');
+  assert_equals(typeof event.interval, 'number');
+}, 'Tests that document.createEvent() works with DeviceMotionEvent.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/multiple-event-listeners.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/multiple-event-listeners.https.html
new file mode 100644
index 00000000000..ad851eec291
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/multiple-event-listeners.https.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const motionData1 = generateMotionData(1, 2, 3,
+                                         4, 5, 6,
+                                         7, 8, 9);
+  const motionData2 = generateMotionData(11, 12, 13,
+                                         14, 15, 16,
+                                         17, 18, 19);
+
+  let firstListener = null;
+  let firstEventPromise = new Promise(resolve => {
+    firstListener = resolve;
+  });
+  // We directly add the listener instead of using waitForMotion
+  // because we want the listener to stay active after the first event fires.
+  window.addEventListener('devicemotion', firstListener);
+  let secondEventPromise = waitForMotion(motionData1);
+  setMockMotionData(sensorProvider, motionData1);
+  let firstEvent = await firstEventPromise;
+  checkMotion(firstEvent, motionData1);
+  await secondEventPromise;
+
+  // At this point only the first event listener is active.
+  setMockMotionData(sensorProvider, motionData2);
+  window.removeEventListener('devicemotion', firstListener);
+
+  return waitForMotion(motionData2);
+}, 'Tests using multiple event handlers for the Device Motion API.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/null-values.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/null-values.https.html
new file mode 100644
index 00000000000..4da64c0c9e8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/null-values.https.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const motionData1 = generateMotionData(1, 2, 3,
+                                         null, null, null,
+                                         null, null, null);
+
+  const motionData2 = generateMotionData(null, null, null,
+                                         1, 2, 3,
+                                         null, null, null);
+
+  const motionData3 = generateMotionData(null, null, null,
+                                         null, null, null,
+                                         1, 2, 3);
+
+  const motionData4 = generateMotionData(null, null, null,
+                                         null, null, null,
+                                         null, null, null);
+
+  setMockMotionData(sensorProvider, motionData1);
+  await waitForMotion(motionData1);
+
+  setMockMotionData(sensorProvider, motionData2);
+  await waitForMotion(motionData2);
+
+  setMockMotionData(sensorProvider, motionData3);
+  await waitForMotion(motionData3);
+
+  setMockMotionData(sensorProvider, motionData4);
+  return waitForMotion(motionData4);
+}, 'Tests using null values for some or all of the event properties.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/optional-event-properties.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/optional-event-properties.https.html
new file mode 100644
index 00000000000..0a73721cb9e
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/optional-event-properties.https.html
@@ -0,0 +1,257 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+function ObjectThrowingException() {};
+ObjectThrowingException.prototype.valueOf = () => { throw new Error('valueOf threw exception'); }
+ObjectThrowingException.prototype.__defineGetter__("x", () => { throw new Error('x getter exception'); });
+ObjectThrowingException.prototype.__defineGetter__("alpha", () => { throw new Error('alpha getter exception'); });
+const objectThrowingException = new ObjectThrowingException();
+
+test(test => {
+  event = document.createEvent('DeviceMotionEvent');
+  assert_equals(event.type, "");
+  assert_equals(event.acceleration, null);
+  assert_equals(event.accelerationIncludingGravity, null);
+  assert_equals(event.rotationRate, null);
+  assert_equals(event.interval, 0);
+}, 'Tests creating a DeviceMotionEvent.');
+
+test(test => {
+  event = new DeviceMotionEvent('foo', {acceleration: {x: 0, y: 1, z: 2},
+                                     accelerationIncludingGravity: {x: 3, y: 4, z: 5},
+                                     rotationRate: {alpha: 6, beta: 7, gamma: 8},
+                                     interval: 9});
+  assert_equals(event.type, "foo");
+  assert_equals(event.acceleration.x, 0);
+  assert_equals(event.acceleration.y, 1);
+  assert_equals(event.acceleration.z, 2);
+  assert_equals(event.accelerationIncludingGravity.x, 3);
+  assert_equals(event.accelerationIncludingGravity.y, 4);
+  assert_equals(event.accelerationIncludingGravity.z, 5);
+  assert_equals(event.rotationRate.alpha, 6);
+  assert_equals(event.rotationRate.beta, 7);
+  assert_equals(event.rotationRate.gamma, 8);
+  assert_equals(event.interval, 9);
+}, 'Tests no missing value.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: objectThrowingException,
+                                       accelerationIncludingGravity: {x: 3, z: 5},
+                                       rotationRate: {gamma: 8, beta: 7},
+                                       interval: 9});
+    assert_unreached("Invalid acceleration, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "x getter exception");
+  }
+}, 'Tests invalid acceleration.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: {x: 0, y: 1, z: 2},
+                                       accelerationIncludingGravity: objectThrowingException,
+                                       rotationRate: {gamma: 8, beta: 7},
+                                       interval: 9});
+    assert_unreached("Invalid acelerationIncludingGravity, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "x getter exception");
+  }
+}, 'Tests invalid acelerationIncludingGravity.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: {x: 0, y: 1, z: 2},
+                                       accelerationIncludingGravity: {x: 3, z: 5},
+                                       rotationRate: objectThrowingException,
+                                       interval: 9});
+    assert_unreached("Invalid rotationRate, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "alpha getter exception");
+  }
+}, 'Tests invalid rotationRate.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: {x: objectThrowingException, y: 1, z: 2},
+                                       accelerationIncludingGravity: {x: 3, y: 4, z: 5},
+                                       rotationRate: {alpha: 6, beta: 7, gamma: 8},
+                                       interval: 9});
+    assert_unreached("Invalid acceleration.x, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "valueOf threw exception");
+  }
+}, 'Tests invalid acceleration.x.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: {x: 0, y: 1, z: 2},
+                                       accelerationIncludingGravity: {x: 3, y: objectThrowingException, z: 5},
+                                       rotationRate: {alpha: 6, beta: 7, gamma: 8},
+                                       interval: 9});
+    assert_unreached("Invalid accelerationIncludingGravity.y, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "valueOf threw exception");
+  }
+}, 'Tests invalid accelerationIncludingGravity.y.');
+
+test(test => {
+  try {
+    event = new DeviceMotionEvent('', {acceleration: {x: 0, y: 1, z: 2},
+                                       accelerationIncludingGravity: {x: 3, y: 4, z: 5},
+                                       rotationRate: {alpha: 6, beta: 7, gamma: objectThrowingException},
+                                       interval: 9});
+    assert_unreached("Invalid rotationRate.gamma, must throw an Error exception");
+  } catch (e) {
+    assert_equals(e.name, "Error");
+    assert_equals(e.message, "valueOf threw exception");
+  }
+}, 'Tests invalid rotationRate.gamma.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: {y: 1, x: 0},
+                                     accelerationIncludingGravity: {x: 3, z: 5},
+                                     rotationRate: {gamma: 8, beta: 7},
+                                     interval: 9});
+  assert_equals(event.acceleration.x, 0);
+  assert_equals(event.acceleration.y, 1);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity.x, 3);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, 5);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, 7);
+  assert_equals(event.rotationRate.gamma, 8);
+  assert_equals(event.interval, 9);
+}, 'Tests missing fields should be null.');
+
+test(test => {
+  event = new DeviceMotionEvent('');
+  assert_equals(event.acceleration, null);
+  assert_equals(event.accelerationIncludingGravity, null);
+  assert_equals(event.rotationRate, null);
+  assert_equals(event.interval, 0);
+}, 'Tests DeviceMotionEvent default constructor.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: [],
+                                     accelerationIncludingGravity: [],
+                                     rotationRate: [],
+                                     interval: []});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, null);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, null);
+  assert_equals(event.interval, 0);
+}, 'Tests all values are empty array.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: [],
+                                     accelerationIncludingGravity: undefined,
+                                     rotationRate: undefined,
+                                     interval: undefined});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity, null);
+  assert_equals(event.rotationRate, null);
+  assert_equals(event.interval, 0);
+}, 'Tests some values are empty array and some values are undefined.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: null,
+                                     accelerationIncludingGravity: null,
+                                     rotationRate: null,
+                                     interval: null});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, null);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, null);
+  assert_equals(event.interval, 0);
+}, "Tests all values are null.");
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: {x: null, y: null, z: null},
+                                     accelerationIncludingGravity: {x: null, y: null, z: null},
+                                     rotationRate: {alpha: null, beta: null, gamma: null},
+                                     interval: null});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, null);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, null);
+  assert_equals(event.interval, 0);
+}, 'Tests all fields are null.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: {x: null, y: null, z: 1},
+                                     accelerationIncludingGravity: {x: null, y: null, z: 2},
+                                     rotationRate: {alpha: null, beta: null, gamma: 3},
+                                     interval: null});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, 1);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, 2);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, 3);
+  assert_equals(event.interval, 0);
+}, 'Tests some fields are null.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: {x: undefined, y: undefined, z: undefined},
+                                     accelerationIncludingGravity: {x: undefined, y: undefined, z: undefined},
+                                     rotationRate: {alpha: undefined, beta: undefined, gamma: undefined},
+                                     interval: undefined});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, null);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, null);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, null);
+  assert_equals(event.interval, 0);
+}, 'Tests all fields are undefined.');
+
+test(test => {
+  event = new DeviceMotionEvent('', {acceleration: {x: undefined, y: undefined, z: 1},
+                                     accelerationIncludingGravity: {x: undefined, y: undefined, z: 2},
+                                     rotationRate: {alpha: undefined, beta: undefined, gamma: 3},
+                                     interval: undefined});
+  assert_equals(event.acceleration.x, null);
+  assert_equals(event.acceleration.y, null);
+  assert_equals(event.acceleration.z, 1);
+  assert_equals(event.accelerationIncludingGravity.x, null);
+  assert_equals(event.accelerationIncludingGravity.y, null);
+  assert_equals(event.accelerationIncludingGravity.z, 2);
+  assert_equals(event.rotationRate.alpha, null);
+  assert_equals(event.rotationRate.beta, null);
+  assert_equals(event.rotationRate.gamma, 3);
+  assert_equals(event.interval, 0);
+}, 'Tests some fields are undefined.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/motion/page-visibility-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/motion/page-visibility-manual.https.html
new file mode 100644
index 00000000000..37e48ce9791
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/motion/page-visibility-manual.https.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+promise_test(t => {
+  return new Promise((resolve, reject) => {
+    document.addEventListener("visibilitychange", () => {
+      assert_true(document.hidden, "document is hidden");
+      window.addEventListener(
+          'devicemotion',
+          event => {
+            if (document.hidden) {
+              reject();
+            } else {
+              resolve();
+            }
+          },
+          { once: true });
+    }, { once: true });
+  });
+}, 'Tests to check that devicemotion events are not fired when the page is not visible.');
+</script>
+
+<p>Switch the page to the background, then switch back to it.</p>
diff --git a/tests/wpt/web-platform-tests/orientation-event/ondeviceorientationabsolute.https.html b/tests/wpt/web-platform-tests/orientation-event/ondeviceorientationabsolute.https.html
deleted file mode 100644
index 73ce97ab5c1..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/ondeviceorientationabsolute.https.html
+++ /dev/null
@@ -1,43 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>User agents must also provide an event handler IDL attribute named ondeviceorientationabsolute on the window object</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-  </head>
-  <body>
-    <p>Rotate the device to run the tests.</p>
-    <div id="log"></div>
-    <script>
-      var t1 = async_test("Provide an event handler IDL attribute named ondeviceorientationabsolute");
-      var t2 = async_test("The type of this event handler must be 'DeviceOrientationEvent'");
-      var t3 = async_test("The absolute property must be set to true.");
-      var run = false;
-      if (window.ondeviceorientationabsolute === undefined) {
-        t1.step(t1.unreached_func("ondeviceorientationabsolute not supported"));
-        t2.step(t2.unreached_func("ondeviceorientationabsolute not supported"));
-        t3.step(t3.unreached_func("ondeviceorientationabsolute not supported"));
-      } else {
-        window.ondeviceorientationabsolute = function(e) {
-          if (!run) {
-            run = true;
-            t1.step(function() {
-              assert_equals(e.type, "deviceorientationabsolute");
-            });
-            t1.done();
-            t2.step(function() {
-              assert_true(e instanceof DeviceOrientationEvent);
-           });
-            t2.done();
-            t3.step(function() {
-              assert_true(e.absolute);
-            });
-            t3.done();
-          }
-        };
-      }
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/absolute-fallback.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/absolute-fallback.https.html
new file mode 100644
index 00000000000..de0770a9f75
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/absolute-fallback.https.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
+
+  // Make the relative orientation sensor unavailable and set mock data for
+  // the absolute one.
+  sensorProvider.setGetSensorShouldFail('RelativeOrientationEulerAngles', true);
+  setMockOrientationData(sensorProvider, orientationData);
+  return waitForOrientation(orientationData);
+}, 'Tests that deviceorientation falls back to using absolute orientation data if relative is unavailable.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/add-listener-from-callback.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/add-listener-from-callback.https.html
new file mode 100644
index 00000000000..040e2a2f5d1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/add-listener-from-callback.https.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+
+  let firstListener = null;
+  let secondListener = null;
+  let firstEventCount = 0;
+  let firstPromise = new Promise(resolve => {
+    firstListener = (event) => {
+      assert_true(event instanceof DeviceOrientationEvent, 'event is DeviceOrientationEvent');
+      assert_equals(event.type, 'deviceorientation', 'event.type is devicemotion');
+      assert_true(event.target instanceof Window, 'event is fired on the window object');
+      checkOrientation(event, orientationData);
+      window.removeEventListener('deviceorientation', firstListener);
+      if (++firstEventCount == 1) {
+        window.addEventListener('deviceorientation', secondListener);
+      }
+      resolve(event);
+    };
+  });
+
+  let secondEventCount = 0;
+  let secondPromise = new Promise(resolve => {
+    secondListener = (event) => {
+      checkOrientation(event, orientationData);
+      window.removeEventListener('deviceorientation', secondListener);
+      ++secondEventCount;
+      resolve(event);
+    };
+  });
+
+  setMockOrientationData(sensorProvider, orientationData);
+  window.addEventListener('deviceorientation', firstListener);
+  await firstPromise;
+  await secondPromise;
+  assert_equals(firstEventCount, 1, "Too many events fired for the first listener");
+  assert_equals(secondEventCount, 1, "Too many events fired for the second listener");
+}, 'Tests that adding a new deviceorientation event listener from a callback works as expected.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation-absolute.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation-absolute.https.html
new file mode 100644
index 00000000000..bc35e1498f4
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation-absolute.https.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
+
+  setMockOrientationData(sensorProvider, orientationData);
+  return waitForAbsoluteOrientation(orientationData);
+}, 'Tests basic operation of deviceorientationabsolute event using mock data.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation.https.html
new file mode 100644
index 00000000000..eb57d141b35
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/basic-operation.https.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+
+  setMockOrientationData(sensorProvider, orientationData);
+  return waitForOrientation(orientationData);
+}, 'Tests basic operation of deviceorientation event using mock data.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/create-event.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/create-event.https.html
new file mode 100644
index 00000000000..f1e5c0f8ad2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/create-event.https.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+test(test => {
+  const event = document.createEvent('DeviceOrientationEvent');
+  const newEvent = new CustomEvent("deviceorientation", {
+      bubbles: false, cancelable: false,
+      alpha: 1.0,
+      beta: 2.0,
+      gama: 3.0,
+      absolute: false
+  });
+
+  assert_equals(typeof event, 'object');
+  assert_equals(event.__proto__, DeviceOrientationEvent.prototype);
+
+  assert_true('type' in event);
+  assert_true('bubbles' in event);
+  assert_true('cancelable' in event);
+  assert_true('alpha' in event);
+  assert_true('beta' in event);
+  assert_true('gamma' in event);
+  assert_true('absolute' in event);
+
+  assert_equals(typeof event.type, 'string');
+  assert_equals(typeof event.bubbles, 'boolean');
+  assert_equals(typeof event.cancelable, 'boolean');
+  assert_equals(typeof event.alpha, 'object');
+  assert_equals(typeof event.beta, 'object');
+  assert_equals(typeof event.gamma, 'object');
+  assert_equals(typeof event.absolute, 'boolean');
+
+  assert_equals(newEvent.type, "deviceorientation");
+  assert_false(newEvent.bubbles);
+  assert_false(newEvent.cancelable);
+}, 'Tests that document.createEvent() works with DeviceOrientationEvent.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/multiple-event-listeners.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/multiple-event-listeners.https.html
new file mode 100644
index 00000000000..3a8add23c94
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/multiple-event-listeners.https.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData1 = generateOrientationData(1, 2, 3, false);
+  const orientationData2 = generateOrientationData(11, 12, 13, false);
+
+  let firstListener = null;
+  let firstEventPromise = new Promise(resolve => {
+    firstListener = resolve;
+  });
+  // We directly add the listener instead of using waitForOrientation
+  // because we want the listener to stay active after the first event fires.
+  window.addEventListener('deviceorientation', firstListener);
+  let secondEventPromise = waitForOrientation(orientationData1);
+  setMockOrientationData(sensorProvider, orientationData1);
+  let firstEvent = await firstEventPromise;
+  checkOrientation(firstEvent, orientationData1);
+  await secondEventPromise;
+
+  // At this point only the first listener is still active.
+  setMockOrientationData(sensorProvider, orientationData2);
+  window.removeEventListener('deviceorientation', firstListener);
+  return waitForOrientation(orientationData2);
+}, 'Tests using multiple event handlers for the Device Orientation API.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/no-synchronous-events.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/no-synchronous-events.https.html
new file mode 100644
index 00000000000..e5d7621123f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/no-synchronous-events.https.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+
+  let setMockDataPromise = setMockOrientationData(sensorProvider, orientationData);
+  // Add an empty listener to make sure the event pump is running and the mock
+  // sensor is created and configured. If the pump and fake sensor weren't set
+  // up ahead of time, then the fact that we get an asynchronous event could be
+  // due to the asynchronous set up process.
+  window.addEventListener('deviceorientation', event => {});
+  await setMockDataPromise;
+
+  return new Promise((resolve, reject) => {
+    let result = reject;
+    window.addEventListener('deviceorientation', event => result());
+    result = resolve;
+  });
+}, 'Tests that events are never fired synchronously from a call to window.addEventListener().');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/null-values.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/null-values.https.html
new file mode 100644
index 00000000000..df18f35c6ca
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/null-values.https.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData1 = generateOrientationData(1.1, null, null, false);
+  const orientationData2 = generateOrientationData(null, 2.2, null, false);
+  const orientationData3 = generateOrientationData(null, null, 3.3, false);
+  // The all null event is last because DeviceSingleWindowEventController
+  // will stop updating the sensor when it sees a null event.
+  const orientationData4 = generateOrientationData(null, null, null, false);
+
+  setMockOrientationData(sensorProvider, orientationData1);
+  await waitForOrientation(orientationData1);
+
+  setMockOrientationData(sensorProvider, orientationData2);
+  await waitForOrientation(orientationData2);
+
+  setMockOrientationData(sensorProvider, orientationData3);
+  await waitForOrientation(orientationData3);
+
+  setMockOrientationData(sensorProvider, orientationData4);
+  return waitForOrientation(orientationData4);
+}, 'Tests using null values for some of the event properties.');
+</script>
+</html>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/optional-event-properties.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/optional-event-properties.https.html
new file mode 100644
index 00000000000..150ce5ca1d2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/optional-event-properties.https.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+test(test => {
+  event = document.createEvent('DeviceOrientationEvent');
+  assert_equals(event.type, "");
+  assert_equals(event.alpha, null);
+  assert_equals(event.beta, null);
+  assert_equals(event.gamma, null);
+  assert_false(event.absolute);
+}, 'Tests creating a DeviceOrientationEvent.');
+
+test(test => {
+  event = new DeviceOrientationEvent('foo', {alpha: 0, beta: 1, gamma: 2, absolute: false});
+  assert_equals(event.type, "foo");
+  assert_equals(event.alpha, 0);
+  assert_equals(event.beta, 1);
+  assert_equals(event.gamma, 2);
+  assert_false(event.absolute);
+}, 'Tests no missing value (absolute field is false).');
+
+test(test => {
+  event = new DeviceOrientationEvent('', {alpha: 0, beta: 1, gamma: 2, absolute: true});
+  assert_equals(event.alpha, 0);
+  assert_equals(event.beta, 1);
+  assert_equals(event.gamma, 2);
+  assert_true(event.absolute);
+}, 'Tests no missing value (absolute field is true).');
+
+test(test => {
+  event = new DeviceOrientationEvent('');
+  assert_equals(event.alpha, null);
+  assert_equals(event.beta, null);
+  assert_equals(event.gamma, null);
+  assert_false(event.absolute);
+}, 'Tests DeviceOrientationEvent default constructor.');
+
+test(test => {
+  event = new DeviceOrientationEvent('', {alpha: [], beta: [], gamma: [], absolute: []});
+  assert_equals(event.alpha, 0);
+  assert_equals(event.beta, 0);
+  assert_equals(event.gamma, 0);
+  assert_true(event.absolute);
+}, 'Tests all values are empty array.');
+
+test(test => {
+  event = new DeviceOrientationEvent('', {alpha: undefined, beta: undefined, gamma: undefined, absolute: undefined});
+  assert_equals(event.alpha, null);
+  assert_equals(event.beta, null);
+  assert_equals(event.gamma, null);
+  assert_false(event.absolute);
+}, 'Tests all values are undefined.');
+
+test(test => {
+  event = new DeviceOrientationEvent('', {alpha: '', beta: '', gamma: '', absolute: ''});
+  assert_equals(event.alpha, 0);
+  assert_equals(event.beta, 0);
+  assert_equals(event.gamma, 0);
+  assert_false(event.absolute);
+}, 'Tests all values are empty string.');
+
+
+test(test => {
+  event = new DeviceOrientationEvent('', {alpha: null, beta: null, gamma: null, absolute: null});
+  assert_equals(event.alpha, null);
+  assert_equals(event.beta, null);
+  assert_equals(event.gamma, null);
+  assert_false(event.absolute);
+}, 'Tests all values are null.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/page-visibility-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/page-visibility-manual.https.html
new file mode 100644
index 00000000000..033f17602b8
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/page-visibility-manual.https.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+promise_test(t => {
+  return new Promise((resolve, reject) => {
+    document.addEventListener("visibilitychange", () => {
+      assert_true(document.hidden, "document is hidden");
+      window.addEventListener(
+          'deviceorientation',
+          event => {
+            if (document.hidden) {
+              reject();
+            } else {
+              resolve();
+            }
+          },
+          { once: true });
+    }, { once: true });
+  });
+}, 'Tests to check that deviceorientation events are not fired when the page is not visible.');
+</script>
+
+<p>Switch the page to the background, then switch back to it.</p>
diff --git a/tests/wpt/web-platform-tests/orientation-event/orientation/updates.https.html b/tests/wpt/web-platform-tests/orientation-event/orientation/updates.https.html
new file mode 100644
index 00000000000..09472e6b419
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/orientation/updates.https.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<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/orientation-event-helpers.js"></script>
+<script>
+'use strict';
+
+sensor_test(async (t, sensorProvider) => {
+  const orientationData1 = generateOrientationData(1.1, 2.2, 3.3, false);
+  const orientationData2 = generateOrientationData(11.1, 22.2, 33.3, false);
+
+  setMockOrientationData(sensorProvider, orientationData1);
+  await waitForOrientation(orientationData1);
+
+  setMockOrientationData(sensorProvider, orientationData2);
+  return waitForOrientation(orientationData2);
+}, 'Tests that updates to the orientation causes new events to fire.');
+</script>
diff --git a/tests/wpt/web-platform-tests/orientation-event/resources/orientation-event-helpers.js b/tests/wpt/web-platform-tests/orientation-event/resources/orientation-event-helpers.js
new file mode 100644
index 00000000000..528dfa9a7a0
--- /dev/null
+++ b/tests/wpt/web-platform-tests/orientation-event/resources/orientation-event-helpers.js
@@ -0,0 +1,247 @@
+'use strict';
+
+// These tests rely on the User Agent providing an implementation of
+// platform sensor backends.
+//
+// In Chromium-based browsers this implementation is provided by a polyfill
+// in order to reduce the amount of test-only code shipped to users. To enable
+// these tests the browser must be run with these options:
+//
+//   --enable-blink-features=MojoJS,MojoJSTest
+const loadChromiumResources = async () => {
+  if (!('MojoInterfaceInterceptor' in self)) {
+    // Do nothing on non-Chromium-based browsers or when the Mojo bindings are
+    // not present in the global namespace.
+    return;
+  }
+
+  const resources = [
+    '/gen/layout_test_data/mojo/public/js/mojo_bindings.js',
+    '/gen/mojo/public/mojom/base/string16.mojom.js',
+    '/gen/services/device/public/mojom/sensor.mojom.js',
+    '/gen/services/device/public/mojom/sensor_provider.mojom.js',
+    '/resources/chromium/generic_sensor_mocks.js',
+  ];
+
+  await Promise.all(resources.map(path => {
+    const script = document.createElement('script');
+    script.src = path;
+    script.async = false;
+    const promise = new Promise((resolve, reject) => {
+      script.onload = resolve;
+      script.onerror = reject;
+    });
+    document.head.appendChild(script);
+    return promise;
+  }));
+};
+
+async function initialize_generic_sensor_tests() {
+  if (typeof GenericSensorTest === 'undefined') {
+    await loadChromiumResources();
+  }
+  assert_true(
+    typeof GenericSensorTest !== 'undefined',
+    'Mojo testing interface is not available.'
+  );
+  let sensorTest = new GenericSensorTest();
+  await sensorTest.initialize();
+  return sensorTest;
+}
+
+function sensor_test(func, name, properties) {
+  promise_test(async (t) => {
+    let sensorTest = await initialize_generic_sensor_tests();
+    try {
+      await func(t, sensorTest.getSensorProvider());
+    } finally {
+      await sensorTest.reset();
+    };
+  }, name, properties);
+}
+
+const MOTION_ROTATION_EPSILON = 1e-8;
+
+function generateMotionData(accelerationX, accelerationY, accelerationZ,
+                            accelerationIncludingGravityX,
+                            accelerationIncludingGravityY,
+                            accelerationIncludingGravityZ,
+                            rotationRateAlpha, rotationRateBeta, rotationRateGamma,
+                            interval = 16) {
+  const motionData = {accelerationX: accelerationX,
+                    accelerationY: accelerationY,
+                    accelerationZ: accelerationZ,
+                    accelerationIncludingGravityX: accelerationIncludingGravityX,
+                    accelerationIncludingGravityY: accelerationIncludingGravityY,
+                    accelerationIncludingGravityZ: accelerationIncludingGravityZ,
+                    rotationRateAlpha: rotationRateAlpha,
+                    rotationRateBeta: rotationRateBeta,
+                    rotationRateGamma: rotationRateGamma,
+                    interval: interval};
+  return motionData;
+}
+
+function generateOrientationData(alpha, beta, gamma, absolute) {
+  const orientationData = {alpha: alpha,
+                         beta: beta,
+                         gamma: gamma,
+                         absolute: absolute};
+  return orientationData;
+}
+
+async function setMockSensorDataForType(sensorProvider, sensorType, mockDataArray) {
+  const createdSensor = await sensorProvider.getCreatedSensor(sensorType);
+  return createdSensor.setSensorReading([mockDataArray]);
+}
+
+// Device[Orientation|Motion]EventPump treat NaN as a missing value.
+let nullToNan = x => (x === null ? NaN : x);
+
+function setMockMotionData(sensorProvider, motionData) {
+  const degToRad = Math.PI / 180;
+  return Promise.all([
+      setMockSensorDataForType(sensorProvider, "Accelerometer", [
+          nullToNan(motionData.accelerationIncludingGravityX),
+          nullToNan(motionData.accelerationIncludingGravityY),
+          nullToNan(motionData.accelerationIncludingGravityZ),
+      ]),
+      setMockSensorDataForType(sensorProvider, "LinearAccelerationSensor", [
+          nullToNan(motionData.accelerationX),
+          nullToNan(motionData.accelerationY),
+          nullToNan(motionData.accelerationZ),
+      ]),
+      setMockSensorDataForType(sensorProvider, "Gyroscope", [
+          nullToNan(motionData.rotationRateAlpha) * degToRad,
+          nullToNan(motionData.rotationRateBeta) * degToRad,
+          nullToNan(motionData.rotationRateGamma) * degToRad,
+      ]),
+  ]);
+}
+
+function setMockOrientationData(sensorProvider, orientationData) {
+  let sensorType = orientationData.absolute
+      ? "AbsoluteOrientationEulerAngles" : "RelativeOrientationEulerAngles";
+  return setMockSensorDataForType(sensorProvider, sensorType, [
+      nullToNan(orientationData.beta),
+      nullToNan(orientationData.gamma),
+      nullToNan(orientationData.alpha),
+  ]);
+}
+
+function checkMotion(event, expectedMotionData) {
+  assert_equals(event.acceleration.x, expectedMotionData.accelerationX, "acceleration.x");
+  assert_equals(event.acceleration.y, expectedMotionData.accelerationY, "acceleration.y");
+  assert_equals(event.acceleration.z, expectedMotionData.accelerationZ, "acceleration.z");
+
+  assert_equals(event.accelerationIncludingGravity.x, expectedMotionData.accelerationIncludingGravityX, "accelerationIncludingGravity.x");
+  assert_equals(event.accelerationIncludingGravity.y, expectedMotionData.accelerationIncludingGravityY, "accelerationIncludingGravity.y");
+  assert_equals(event.accelerationIncludingGravity.z, expectedMotionData.accelerationIncludingGravityZ, "accelerationIncludingGravity.z");
+
+  assert_approx_equals(event.rotationRate.alpha, expectedMotionData.rotationRateAlpha, MOTION_ROTATION_EPSILON, "rotationRate.alpha");
+  assert_approx_equals(event.rotationRate.beta, expectedMotionData.rotationRateBeta, MOTION_ROTATION_EPSILON, "rotationRate.beta");
+  assert_approx_equals(event.rotationRate.gamma, expectedMotionData.rotationRateGamma, MOTION_ROTATION_EPSILON, "rotationRate.gamma");
+
+  assert_equals(event.interval, expectedMotionData.interval, "interval");
+}
+
+function checkOrientation(event, expectedOrientationData) {
+  assert_equals(event.alpha, expectedOrientationData.alpha, "alpha");
+  assert_equals(event.beta, expectedOrientationData.beta, "beta");
+  assert_equals(event.gamma, expectedOrientationData.gamma, "gamma");
+
+  assert_equals(event.absolute, expectedOrientationData.absolute, "absolute");
+}
+
+// Returns a promise that will be resolved when an event equal to the given
+// event is fired.
+function waitForEvent(expectedEvent, targetWindow = window) {
+  const stringify = (thing, targetWindow) => {
+    if (thing instanceof targetWindow.Object && thing.constructor !== targetWindow.Object) {
+      let str = '{';
+      for (let key of Object.keys(Object.getPrototypeOf(thing))) {
+        str += JSON.stringify(key) + ': ' + stringify(thing[key], targetWindow) + ', ';
+      }
+      return str + '}';
+    } else if (thing instanceof Number) {
+      return thing.toFixed(6);
+    }
+    return JSON.stringify(thing);
+  };
+
+  return new Promise((resolve, reject) => {
+    let events = [];
+    let timeoutId = null;
+
+    const expectedEventString = stringify(expectedEvent, window);
+    function listener(event) {
+      const eventString = stringify(event, targetWindow);
+      if (eventString === expectedEventString) {
+        targetWindow.clearTimeout(timeoutId);
+        targetWindow.removeEventListener(expectedEvent.type, listener);
+        resolve();
+      } else {
+        events.push(eventString);
+      }
+    }
+    targetWindow.addEventListener(expectedEvent.type, listener);
+
+    timeoutId = targetWindow.setTimeout(() => {
+      targetWindow.removeEventListener(expectedEvent.type, listener);
+      let errorMessage = 'Timeout waiting for expected event: ' + expectedEventString;
+      if (events.length == 0) {
+        errorMessage += ', no events were fired';
+      } else {
+        errorMessage += ', received events: '
+        for (let event of events) {
+          errorMessage += event + ', ';
+        }
+      }
+      reject(errorMessage);
+    }, 500);
+  });
+}
+
+function waitForOrientation(expectedOrientationData, targetWindow = window) {
+  return waitForEvent(
+      new DeviceOrientationEvent('deviceorientation', {
+        alpha: expectedOrientationData.alpha,
+        beta: expectedOrientationData.beta,
+        gamma: expectedOrientationData.gamma,
+        absolute: expectedOrientationData.absolute,
+      }),
+      targetWindow);
+}
+
+function waitForAbsoluteOrientation(expectedOrientationData, targetWindow = window) {
+  return waitForEvent(
+      new DeviceOrientationEvent('deviceorientationabsolute', {
+        alpha: expectedOrientationData.alpha,
+        beta: expectedOrientationData.beta,
+        gamma: expectedOrientationData.gamma,
+        absolute: expectedOrientationData.absolute,
+      }),
+      targetWindow);
+}
+
+function waitForMotion(expectedMotionData, targetWindow = window) {
+  return waitForEvent(
+      new DeviceMotionEvent('devicemotion', {
+        acceleration: {
+          x: expectedMotionData.accelerationX,
+          y: expectedMotionData.accelerationY,
+          z: expectedMotionData.accelerationZ,
+        },
+        accelerationIncludingGravity: {
+          x: expectedMotionData.accelerationIncludingGravityX,
+          y: expectedMotionData.accelerationIncludingGravityY,
+          z: expectedMotionData.accelerationIncludingGravityZ,
+        },
+        rotationRate: {
+          alpha: expectedMotionData.rotationRateAlpha,
+          beta: expectedMotionData.rotationRateBeta,
+          gamma: expectedMotionData.rotationRateGamma,
+        },
+        interval: expectedMotionData.interval,
+      }),
+      targetWindow);
+}
diff --git a/tests/wpt/web-platform-tests/orientation-event/t001-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t001-manual.https.html
deleted file mode 100644
index a38d3fd5398..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t001-manual.https.html
+++ /dev/null
@@ -1,26 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>User agents implementing this specification must provide a new DOM event, named deviceorientation</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-12 -->
-  </head>
-  <body>
-    <p>Rotate the device to run the test.</p>
-    <div id="log"></div>
-    <script>
-      var t = async_test("deviceorientation event fires");
-      var run = false;
-      window.addEventListener("deviceorientation", function(e) {
-        if (!run) {
-          run = true;
-          t.done();
-        }
-      }, false);
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/t002-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t002-manual.https.html
deleted file mode 100644
index 13acb46838a..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t002-manual.https.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>The corresponding event must be of type DeviceOrientationEvent and must fire on the window object.</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-12 -->
-  </head>
-  <body>
-    <p>Rotate the device to run the tests.</p>
-    <div id="log"></div>
-    <script>
-      var t1 = async_test("The corresponding event must be of type DeviceOrientationEvent");
-      var t2 = async_test("The corresponding event must fire on the window object");
-      var run = false;
-      window.addEventListener("deviceorientation", function(e) {
-        if (!run) {
-          run = true;
-          var _this = this;
-          t1.step(function() {
-            assert_equals(e.type, "deviceorientation");
-          });
-          t1.done();
-          t2.step(function() {
-            assert_equals(_this, window);
-          });
-          t2.done();
-        }
-      }, false);
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/t003-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t003-manual.https.html
deleted file mode 100644
index 328132d08e8..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t003-manual.https.html
+++ /dev/null
@@ -1,34 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>User agents must also provide an event handler IDL attribute [HTML5] named ondeviceorientation on the window object</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-12 -->
-  </head>
-  <body>
-    <p>Rotate the device to run the tests.</p>
-    <div id="log"></div>
-    <script>
-      var t1 = async_test("Provide an event handler IDL attribute [HTML5] named ondeviceorientation");
-      var t2 = async_test("The type of this event handler must be 'DeviceOrientationEvent'");
-      var run = false;
-      window.ondeviceorientation = function(e) {
-        if (!run) {
-          run = true;
-          t1.step(function() {
-            assert_equals(e.type, "deviceorientation");
-          });
-          t1.done();
-          t2.step(function() {
-            assert_true(e instanceof "DeviceOrientationEvent");
-          });
-          t2.done();
-        }
-      };
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/t021-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t021-manual.https.html
deleted file mode 100644
index 449d6100f10..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t021-manual.https.html
+++ /dev/null
@@ -1,26 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>User agents implementing this specification must provide a new DOM event, named devicemotion</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-14 -->
-  </head>
-  <body>
-    <p>Move the device to run the test.</p>
-    <div id="log"></div>
-    <script>
-      var t = async_test("devicemotion event exists");
-      var run = false;
-      window.addEventListener("devicemotion", function(e) {
-        if (!run) {
-          run = true;
-          t.done();
-        }
-      }, false);
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/t022-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t022-manual.https.html
deleted file mode 100644
index 45e9e7e83e4..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t022-manual.https.html
+++ /dev/null
@@ -1,34 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>The corresponding event must be of type DeviceOrientationEvent and must fire on the window object</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-14 -->
-  </head>
-  <body>
-    <p>Move the device to run the test.</p>
-    <div id="log"></div>
-    <script>
-      var t1 = async_test("The corresponding event must be of type DeviceMotionEvent");
-      var t2 = async_test("The corresponding event must fire on the window object");
-      var run = false;
-      window.addEventListener("devicemotion", function(e) {
-        if (!run) {
-          run = true;
-          t1.step(function() {
-            assert_equals(e.type, "devicemotion");
-          });
-          t1.done();
-          t2.step(function() {
-            assert_true(e.target instanceof Window);
-          });
-          t2.done();
-        }
-      }, false);
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/orientation-event/t023-manual.https.html b/tests/wpt/web-platform-tests/orientation-event/t023-manual.https.html
deleted file mode 100644
index 7606e52327d..00000000000
--- a/tests/wpt/web-platform-tests/orientation-event/t023-manual.https.html
+++ /dev/null
@@ -1,34 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <title>User agents must also provide an event handler IDL attribute HTML5 named ondevicemotion on the window object</title>
-    <meta name=viewport content="width=device-width, maximum-scale=1.0">
-    <script src="/resources/testharness.js"></script>
-    <script src="/resources/testharnessreport.js"></script>
-    <link rel="author" title="Mosquito FP7">
-    <link rel="reviewer author" title="Zhiqiang Zhang" href="mailto:zhiqiang.zhang@intel.com"> <!-- 2013-10-14 -->
-  </head>
-  <body>
-    <p>Move the device to run the test.</p>
-    <div id="log"></div>
-    <script>
-      var t1 = async_test("User agents provide an event handler IDL attribute HTML5 named ondevicemotion");
-      var t2 = async_test("The type of this event handler must be 'DeviceMotionEvent'");
-      var run = false;
-      window.ondevicemotion = function(e) {
-        if (!run) {
-          run = true;
-          t1.step(function() {
-            assert_equals(e.type, "devicemotion");
-          });
-          t1.done();
-          t2.step(function() {
-            assert_true(e instanceof "DeviceMotionEvent");
-          });
-          t2.done();
-        }
-      };
-    </script>
-  </body>
-</html>
-
diff --git a/tests/wpt/web-platform-tests/resources/chromium/generic_sensor_mocks.js b/tests/wpt/web-platform-tests/resources/chromium/generic_sensor_mocks.js
index 8f134202ff8..3ee748c9730 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/generic_sensor_mocks.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/generic_sensor_mocks.js
@@ -1,5 +1,31 @@
 'use strict';
 
+// A "sliding window" that iterates over |data| and returns one item at a
+// time, advancing and wrapping around as needed. |data| must be an array of
+// arrays.
+class RingBuffer {
+  constructor(data) {
+    this.bufferPosition_ = 0;
+    // Validate |data|'s format and deep-copy every element.
+    this.data_ = Array.from(data, element => {
+      if (!Array.isArray(element)) {
+        throw new TypeError('Every |data| element must be an array.');
+      }
+      return Array.from(element);
+    })
+  }
+
+  next() {
+    const value = this.data_[this.bufferPosition_];
+    this.bufferPosition_ = (this.bufferPosition_ + 1) % this.data_.length;
+    return { done: false, value: value };
+  }
+
+  [Symbol.iterator]() {
+    return this;
+  }
+}
+
 var GenericSensorTest = (() => {
   // Default sensor frequency in default configurations.
   const DEFAULT_FREQUENCY = 5;
@@ -10,6 +36,7 @@ var GenericSensorTest = (() => {
     constructor(sensorRequest, handle, offset, size, reportingMode) {
       this.client_ = null;
       this.startShouldFail_ = false;
+      this.notifyOnReadingChange_ = true;
       this.reportingMode_ = reportingMode;
       this.sensorReadingTimerId_ = null;
       this.readingData_ = null;
@@ -59,6 +86,13 @@ var GenericSensorTest = (() => {
         this.stopReading();
     }
 
+    // ConfigureReadingChangeNotifications(bool enabled)
+    // Configures whether to report a reading change when in ON_CHANGE
+    // reporting mode.
+    configureReadingChangeNotifications(notifyOnReadingChange) {
+      this.notifyOnReadingChange_ = notifyOnReadingChange;
+    }
+
     // Mock functions
 
     // Resets mock Sensor state.
@@ -66,6 +100,7 @@ var GenericSensorTest = (() => {
       this.stopReading();
       this.startShouldFail_ = false;
       this.requestedFrequencies_ = [];
+      this.notifyOnReadingChange_ = true;
       this.readingData_ = null;
       this.buffer_.fill(0);
       this.binding_.close();
@@ -100,7 +135,8 @@ var GenericSensorTest = (() => {
         // For all tests sensor reading should have monotonically
         // increasing timestamp in seconds.
         this.buffer_[1] = window.performance.now() * 0.001;
-        if (this.reportingMode_ === device.mojom.ReportingMode.ON_CHANGE) {
+        if (this.reportingMode_ === device.mojom.ReportingMode.ON_CHANGE &&
+            this.notifyOnReadingChange_) {
           this.client_.sensorReadingChanged();
         }
       }, timeout);
diff --git a/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js b/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
index 428ca0a5cbc..a04aa37229c 100644
--- a/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
+++ b/tests/wpt/web-platform-tests/resources/chromium/webxr-test.js
@@ -76,6 +76,10 @@ class ChromeXRTest {
     document.body.appendChild(button);
     test_driver.click(button);
   }
+
+  Debug(name, msg) {
+    console.log(new Date().toISOString() + ' DEBUG[' + name + '] ' + msg);
+  }
 }
 
 // Mocking class definitions
@@ -921,9 +925,9 @@ class MockRuntime {
     const neg = XRMathHelper.neg;
 
     //1. Calculate plane normal in world coordinates.
-    const point_A = face[0];
-    const point_B = face[1];
-    const point_C = face[2];
+    const point_A = face.vertices[0];
+    const point_B = face.vertices[1];
+    const point_C = face.vertices[2];
 
     const edge_AB = sub(point_B, point_A);
     const edge_AC = sub(point_C, point_A);
diff --git a/tests/wpt/web-platform-tests/scroll-animations/scroll-animation.html b/tests/wpt/web-platform-tests/scroll-animations/scroll-animation.html
index 521c64d328d..901549e7a44 100644
--- a/tests/wpt/web-platform-tests/scroll-animations/scroll-animation.html
+++ b/tests/wpt/web-platform-tests/scroll-animations/scroll-animation.html
@@ -163,4 +163,62 @@ promise_test(async t => {
       "Animation start time is resolved when the animation is ready.");
 }, 'Animation start and current times are correct if scroll timeline is ' +
    'activated after animation.play call.');
+
+promise_test(async t => {
+    const animation = createScrollLinkedAnimation(t);
+    const scroller = animation.timeline.scrollSource;
+    const maxScroll = scroller.scrollHeight - scroller.clientHeight;
+    const timeRange = animation.timeline.timeRange;
+
+    animation.play();
+    await animation.ready;
+
+    // Advance the scroller to max position.
+    scroller.scrollTop =  maxScroll;
+    await animation.finished;
+
+    // Scroll back.
+    scroller.scrollTop = 0.2 * maxScroll;
+
+    // Wait for new animation frame  which allows the timeline to compute new
+    // current time.
+    await waitForNextFrame();
+    // Verify animation state and current time on reverse scrolling.
+    assert_equals(animation.playState,  'running',
+      'Animation state is playing on reverse scrolling.');
+    assert_equals(animation.currentTime,  0.2 * timeRange,
+      'Animation current time is updated on reverse scrolling.');
+}, 'Finished animation plays on reverse scrolling.');
+
+promise_test(async t => {
+    const animation = createScrollLinkedAnimation(t);
+    const scroller = animation.timeline.scrollSource;
+    const maxScroll = scroller.scrollHeight - scroller.clientHeight;
+
+    animation.play();
+    await animation.ready;
+
+    // Advance the scroller to max position.
+    scroller.scrollTop =  maxScroll;
+    await animation.finished;
+
+    var sent_finish_event = false;
+    animation.onfinish = function() {
+      sent_finish_event = true;
+    };
+
+    // Scroll back.
+    scroller.scrollTop = 0.2 * maxScroll;
+    // Wait for new animation frame  which allows the timeline to compute new
+    // current time.
+    await waitForNextFrame();
+    assert_false(sent_finish_event,
+                 "No animation finished event is sent on reverse scroll.");
+
+    scroller.scrollTop = maxScroll;
+    await animation.finished;
+    assert_true(sent_finish_event,
+                 "Animation finished event is sent on reaching max scroll.");
+}, 'Sending animation finished events by finished animation on reverse ' +
+   'scrolling.');
 </script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/tools/ci/run_tc.py b/tests/wpt/web-platform-tests/tools/ci/run_tc.py
index c460eecbbd7..69625710ad9 100755
--- a/tests/wpt/web-platform-tests/tools/ci/run_tc.py
+++ b/tests/wpt/web-platform-tests/tools/ci/run_tc.py
@@ -150,9 +150,11 @@ def install_chrome(channel):
         raise ValueError("Unrecognized release channel: %s" % channel)
 
     dest = os.path.join("/tmp", deb_archive)
-    resp = urlopen("https://dl.google.com/linux/direct/%s" % deb_archive)
+    deb_url = "https://dl.google.com/linux/direct/%s" % deb_archive
     with open(dest, "w") as f:
-        f.write(resp.read())
+        if not download_url_to_descriptor(f, deb_url):
+            raise RuntimeError("Can't download %s. Aborting" % deb_url)
+
 
     run(["sudo", "apt-get", "-qqy", "update"])
     run(["sudo", "gdebi", "-qn", "/tmp/%s" % deb_archive])
diff --git a/tests/wpt/web-platform-tests/video-raf/META.yml b/tests/wpt/web-platform-tests/video-raf/META.yml
deleted file mode 100644
index 44c3187495d..00000000000
--- a/tests/wpt/web-platform-tests/video-raf/META.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-spec: https://wicg.github.io/video-rag/
-suggested_reviewers:
-  - tguilbert
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/video-raf/README.md b/tests/wpt/web-platform-tests/video-raf/README.md
deleted file mode 100644
index a5272939964..00000000000
--- a/tests/wpt/web-platform-tests/video-raf/README.md
+++ /dev/null
@@ -1,11 +0,0 @@
-# HTMLVideoElement.requestAnimationFrame specification Tests
-
-The HTMLVideoElement.requestAnimationFrame specification is available here: https://wicg.github.io/video-raf
-
-GitHub repository: https://github.com/WICG/video-raf
-
-File an issue: https://github.com/wicg/video-raf/issues/new
-
-## Status of these tests
-
-Theses tests are still basic. The specification is still WIP, and rendering tests will be added to ensure consistenty of behavior/timing relative to other [AnimationFrameProviders](https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames) (e.g. window.rAF).
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/video-rvfc/META.yml b/tests/wpt/web-platform-tests/video-rvfc/META.yml
new file mode 100644
index 00000000000..51048591d0a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/video-rvfc/META.yml
@@ -0,0 +1,3 @@
+spec: https://wicg.github.io/video-rvfc
+suggested_reviewers:
+  - tguilbert
diff --git a/tests/wpt/web-platform-tests/video-rvfc/README.md b/tests/wpt/web-platform-tests/video-rvfc/README.md
new file mode 100644
index 00000000000..ab7a3530515
--- /dev/null
+++ b/tests/wpt/web-platform-tests/video-rvfc/README.md
@@ -0,0 +1,7 @@
+# HTMLVideoElement.requestVideoFrameCallback specification Tests
+
+The HTMLVideoElement.requestVideoFrameCallback specification is available here: https://wicg.github.io/video-rvfc
+
+GitHub repository: https://github.com/WICG/video-rvfc
+
+File an issue: https://github.com/wicg/video-rvfc/issues/new
diff --git a/tests/wpt/web-platform-tests/video-raf/idlharness.window.js b/tests/wpt/web-platform-tests/video-rvfc/idlharness.window.js
similarity index 93%
rename from tests/wpt/web-platform-tests/video-raf/idlharness.window.js
rename to tests/wpt/web-platform-tests/video-rvfc/idlharness.window.js
index cd1e85552da..71fa6e0a3b9 100644
--- a/tests/wpt/web-platform-tests/video-raf/idlharness.window.js
+++ b/tests/wpt/web-platform-tests/video-rvfc/idlharness.window.js
@@ -4,7 +4,7 @@
 'use strict';
 
 idl_test(
-  ['video-raf'],
+  ['video-rvfc'],
   ['html', 'dom'],
   idl_array => {
     idl_array.add_objects({
diff --git a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-parallel.html b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-parallel.html
similarity index 69%
rename from tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-parallel.html
rename to tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-parallel.html
index 35fe4575f3b..3407786c052 100644
--- a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-parallel.html
+++ b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-parallel.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html>
-<title>Test having multiple video.rAF callbacks in flight for a single element.</title>
+<title>Test having multiple video.rVFC callbacks in flight for a single element.</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/media.js"></script>
@@ -12,12 +12,12 @@ async_test(function(t) {
     let firstTime;
     let firstMetadata;
 
-    video.requestAnimationFrame(t.step_func((time, metadata) => {
+    video.requestVideoFrameCallback(t.step_func((time, metadata) => {
       firstTime = time;
       firstMetadata = metadata;
     }));
 
-    video.requestAnimationFrame(t.step_func_done((time, metadata) => {
+    video.requestVideoFrameCallback(t.step_func_done((time, metadata) => {
       assert_equals(firstTime, time);
       assert_object_equals(firstMetadata, metadata);
     }));
@@ -32,18 +32,18 @@ async_test(function(t) {
 
     let secondCallbackId;
 
-    video.requestAnimationFrame(
-      t.step_func(_ => { video.cancelAnimationFrame(secondCallbackId); })
+    video.requestVideoFrameCallback(
+      t.step_func(_ => { video.cancelVideoFrameCallback(secondCallbackId); })
     );
 
-    secondCallbackId = video.requestAnimationFrame(
+    secondCallbackId = video.requestVideoFrameCallback(
       t.step_func(_ => {
         assert_unreached("Cancelled callbacks shouldn't be executed")
       })
     );
 
     // NOTE: This callback should be executed last.
-    video.requestAnimationFrame(
+    video.requestVideoFrameCallback(
       t.step_func_done()
     );
 
diff --git a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-repeating.html b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-repeating.html
similarity index 77%
rename from tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-repeating.html
rename to tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-repeating.html
index d98f39f96b1..0f9aa55717c 100644
--- a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame-repeating.html
+++ b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback-repeating.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html>
-<title>Test repeatedly chaining video.rAF() callbacks.</title>
+<title>Test repeatedly chaining video.rVFC() callbacks.</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/media.js"></script>
@@ -10,19 +10,19 @@ async_test(function(t) {
     let video = document.createElement('video');
 
     let firstTime;
-    video.requestAnimationFrame(t.step_func((time) => {
+    video.requestVideoFrameCallback(t.step_func((time) => {
       firstTime = time;
 
       // Queue up a callback and make sure it's not immediately executed.
       let secondTime;
-      video.requestAnimationFrame(t.step_func((time) => {
+      video.requestVideoFrameCallback(t.step_func((time) => {
         secondTime = time;
         assert_greater_than(secondTime, firstTime, "Callbacks should be executed on the next frame");
       }))
 
       // Queue up a second callback, and make sure it's called at the same time
       // as the one we just queued up.
-      video.requestAnimationFrame(t.step_func_done((time) => {
+      video.requestVideoFrameCallback(t.step_func_done((time) => {
         assert_equals(time, secondTime, "Callbacks queued together should be called at the same time");
       }))
 
@@ -47,15 +47,15 @@ async_test(function(t) {
       if (--numberOfCallsLeft) {
         t.done()
       } else {
-        video.requestAnimationFrame(t.step_func(frameNumberVerifier));
+        video.requestVideoFrameCallback(t.step_func(frameNumberVerifier));
       }
     }
 
-    video.requestAnimationFrame(t.step_func(frameNumberVerifier));
+    video.requestVideoFrameCallback(t.step_func(frameNumberVerifier));
 
     video.src = getVideoURI('/media/movie_5');
     video.play();
 
-}, 'Test chaining calls to video.rAF.');
+}, 'Test chaining calls to video.rVFC.');
 </script>
 </html>
diff --git a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame.html b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback.html
similarity index 51%
rename from tests/wpt/web-platform-tests/video-raf/video-request-animation-frame.html
rename to tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback.html
index 76b986ecb66..743cbc60b54 100644
--- a/tests/wpt/web-platform-tests/video-raf/video-request-animation-frame.html
+++ b/tests/wpt/web-platform-tests/video-rvfc/request-video-frame-callback.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html>
-<title>Test the basics of the video.requestAnimationFrame() API.</title>
+<title>Test the basics of the video.requestVideoFrameCallback() API.</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/media.js"></script>
@@ -14,7 +14,7 @@ var testVideo = {
 async_test(function(t) {
     let video = document.createElement('video');
 
-    let id = video.requestAnimationFrame(
+    let id = video.requestVideoFrameCallback(
       t.step_func_done((time, metadata) => {
         assert_true(time > 0);
         assert_equals(metadata.height, testVideo.height);
@@ -27,51 +27,51 @@ async_test(function(t) {
     video.src = testVideo.url;
     video.play();
 
-}, 'Test we can register a video.rAF callback.');
+}, 'Test we can register a video.rVFC callback.');
 
 
 async_test(function(t) {
     let video = document.createElement('video');
 
-    let id = video.requestAnimationFrame(
+    let id = video.requestVideoFrameCallback(
       t.step_func(_ => {
         assert_unreached("Cancelled callbacks shouldn't be executed")
       })
     );
 
-    video.cancelAnimationFrame(id);
+    video.cancelVideoFrameCallback(id);
 
-    video.requestAnimationFrame(
+    video.requestVideoFrameCallback(
       t.step_func(_ => {
         // At this point, the other callback shouldn't have fired, but
         // give it some more time and really make sure it doesn't, by going
         // throught the event loop once more.
-        t.step_timeout(() => { t.done(); });
+        t.step_timeout(() => { t.done(); }, 0);
       })
     );
 
     video.src = testVideo.url;
     video.play();
-}, 'Test we can cancel a video.rAF request.');
+}, 'Test we can cancel a video.rVFC request.');
 
 test(function(t) {
     let video = document.createElement('video');
 
-    // requestAnimationFrame() expects 1 function as a parameter.
-    assert_throws_js(TypeError, _ => { video.requestAnimationFrame() } );
-    assert_throws_js(TypeError, _ => { video.requestAnimationFrame(0) });
-    assert_throws_js(TypeError, _ => { video.requestAnimationFrame("foo") });
+    // requestVideoFrameCallback() expects 1 function as a parameter.
+    assert_throws_js(TypeError, _ => { video.requestVideoFrameCallback() } );
+    assert_throws_js(TypeError, _ => { video.requestVideoFrameCallback(0) });
+    assert_throws_js(TypeError, _ => { video.requestVideoFrameCallback("foo") });
 
-    // cancelAnimationFrame() expects 1 number as a parameter
-    assert_throws_js(TypeError, _ => { video.cancelAnimationFrame() } );
+    // cancelVideoFrameCallback() expects 1 number as a parameter
+    assert_throws_js(TypeError, _ => { video.cancelVideoFrameCallback() } );
 
-    // Invalid calls are just noops
-    video.cancelAnimationFrame(_ => {});
-    video.cancelAnimationFrame(NaN);
-    video.cancelAnimationFrame("foo");
-    video.cancelAnimationFrame(12345);
-    video.cancelAnimationFrame(-1);
+    // Invalid calls are just no-ops
+    video.cancelVideoFrameCallback(_ => {});
+    video.cancelVideoFrameCallback(NaN);
+    video.cancelVideoFrameCallback("foo");
+    video.cancelVideoFrameCallback(12345);
+    video.cancelVideoFrameCallback(-1);
 
-}, 'Test invalid calls to the video.rAF API.');
+}, 'Test invalid calls to the video.rVFC API.');
 </script>
 </html>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan_filter.https.html b/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan_filter.https.html
index 850d9b9c088..ddb25b87e14 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan_filter.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NDEFReader_scan_filter.https.html
@@ -176,9 +176,9 @@ nfc_test(async (t, mockNFC) => {
     assertWebNDEFMessagesEqual(event.message, new NDEFMessage(mimeMsg));
   });
 
-  const scanOptions1 = { recordType: "text", signal: signal };
-  const scanOptions2 = {recordType: "url", signal: signal };
-  const scanOptions3 = {recordType: "mime", signal: signal };
+  const scanOptions1 = {recordType: "text", signal: signal};
+  const scanOptions2 = {recordType: "url", signal: signal};
+  const scanOptions3 = {recordType: "mime", signal: signal};
 
   await reader.scan(scanOptions1);
   await reader.scan(scanOptions2);
@@ -193,4 +193,48 @@ nfc_test(async (t, mockNFC) => {
 }, "Multiple scan() from the same NDEFReader object with new options should \
 replace existing filters.");
 
+nfc_test(async (t, mockNFC) => {
+  const reader = new NDEFReader();
+  const controller1 = new AbortController();
+  const controller2 = new AbortController();
+  const urlMsg = createMessage([createUrlRecord(test_url_data)]);
+  const mimeMsg = createMessage([createMimeRecord(test_buffer_data)]);
+
+  const readerWatcher = new EventWatcher(t, reader, ["reading", "error"]);
+  const promise = readerWatcher.wait_for("reading").then(event => {
+    assertWebNDEFMessagesEqual(event.message, new NDEFMessage(mimeMsg));
+    controller2.abort();
+  });
+
+  const scanOptions1 = {recordType: "url", signal: controller1.signal};
+  const scanOptions2 = {recordType: "mime", signal: controller2.signal};
+
+  // There is maximum one filter for an NDEFReader object,
+  // last filter will replace all previous ones.
+  await reader.scan(scanOptions1);
+  await reader.scan(scanOptions2);
+
+  mockNFC.setReadingMessage(urlMsg);
+
+  controller1.abort();
+
+  mockNFC.setReadingMessage(mimeMsg);
+  await promise;
+}, "Aborting on previous signal should not stop current reading for multiple \
+scan() with different signals.");
+
+nfc_test(async (t, mockNFC) => {
+  const reader = new NDEFReader();
+  const controller = new AbortController();
+  const scanOptions1 = {recordType: "url", signal: controller.signal };
+  const scanOptions2 = {recordType: "mime"};
+
+  await reader.scan(scanOptions1);
+  const promise = reader.scan(scanOptions2);
+  controller.abort();
+
+  await promise_rejects_dom(t, 'AbortError', promise);
+}, "Aborting on previous signal can stop current reading if no new signals \
+passed to successive scan().");
+
 </script>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html
new file mode 100644
index 00000000000..0b94bd70f9f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-audiobuffersource-connections.html
@@ -0,0 +1,164 @@
+<!doctype html>
+<html>
+  <head>
+    <title>k-rate AudioParams with inputs for AudioBufferSourceNode</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+  </head>
+
+  <body>
+    <script>
+      let audit = Audit.createTaskRunner();
+
+      // Fairly abitrary sampleRate and somewhat duration
+      const sampleRate = 8000;
+      const testDuration = 0.25;
+
+      [['playbackRate', [1, 0], [2, testDuration]],
+       ['detune', [-1200, 0], [1200, testDuration]]]
+          .forEach(param => {
+            audit.define(
+                {label: param[0], description: `AudioBufferSource ${param[0]}`},
+                async (task, should) => {
+                  await doTest(should, {
+                    prefix: task.label,
+                    paramName: param[0],
+                    startValue: param[1],
+                    endValue: param[2]
+                  });
+                  task.done();
+                });
+          });
+
+      audit.run();
+
+      async function doTest(should, options) {
+        // Test k-rate automation of AudioBufferSourceNode with connected
+        // input.
+        //
+        // A reference source node is created with an automation on the
+        // selected AudioParam. For simplicity, we just use a linear ramp from
+        // the minValue to the maxValue of the AudioParam.
+        //
+        // The test node has an input signal connected to the AudioParam.  This
+        // input signal is created to match the automation on the reference
+        // node.
+        //
+        // Finally, the output from the two nodes must be identical if k-rate
+        // inputs are working correctly.
+        //
+        // Options parameter is a dictionary with the following required
+        // members:
+        //   prefix    - prefix to use for the messages.
+        //   paramName - Name of the AudioParam to be tested
+
+        let {prefix, paramName, startValue, endValue} = options;
+
+        let context = new OfflineAudioContext({
+          numberOfChannels: 2,
+          sampleRate: sampleRate,
+          length: testDuration * sampleRate
+        });
+
+        let merger = new ChannelMergerNode(
+            context, {numberOfInputs: context.destination.channelCount});
+        merger.connect(context.destination);
+
+        // Linear ramp to use for the buffer sources
+        let ramp = createLinearRampBuffer(context, context.length);
+
+        // Create the reference and test nodes.
+        let refNode;
+        let tstNode;
+
+        const nodeOptions = {buffer: ramp};
+
+        should(
+            () => refNode = new AudioBufferSourceNode(context, nodeOptions),
+            `${prefix}: refNode = new AudioBufferSourceNode(context, ${
+                JSON.stringify(nodeOptions)})`)
+            .notThrow();
+
+        should(
+            () => tstNode = new AudioBufferSourceNode(context, nodeOptions),
+            `${prefix}: tstNode = new AudioBufferSourceNode(context, ${
+                JSON.stringify(nodeOptions)})`)
+            .notThrow();
+
+
+        // Automate the AudioParam of the reference node with a linear ramp
+        should(
+            () => refNode[paramName].setValueAtTime(...startValue),
+            `${prefix}: refNode[${paramName}].setValueAtTime(${
+                startValue[0]}, ${startValue[1]})`)
+            .notThrow();
+
+        should(
+            () => refNode[paramName].linearRampToValueAtTime(...endValue),
+            `${prefix}: refNode[${paramName}].linearRampToValueAtTime(${
+                endValue[0]}, ${endValue[1]})`)
+            .notThrow();
+
+
+        // Create the input node and automate it so that it's output when added
+        // to the intrinsic value of the AudioParam we get the same values as
+        // the automations on the reference node.
+
+        // Compute the start and end values based on the defaultValue of the
+        // param and the desired startValue and endValue.  The input is added to
+        // the intrinsic value of the AudioParam, so we need to account for
+        // that.
+
+        let mod;
+        should(
+            () => mod = new ConstantSourceNode(context, {offset: 0}),
+            `${prefix}: mod = new ConstantSourceNode(context, {offset: 0})`)
+            .notThrow();
+
+        let modStart = startValue[0] - refNode[paramName].defaultValue;
+        let modEnd = endValue[0] - refNode[paramName].defaultValue;
+        should(
+            () => mod.offset.setValueAtTime(modStart, startValue[1]),
+            `${prefix}: mod.offset.setValueAtTime(${modStart}, ${
+                startValue[1]})`)
+            .notThrow();
+        should(
+            () => mod.offset.linearRampToValueAtTime(modEnd, endValue[1]),
+            `${prefix}: mod.offset.linearRampToValueAtTime(${modEnd}, ${
+                endValue[1]})`)
+            .notThrow();
+
+        // Connect up everything.
+        should(
+            () => mod.connect(tstNode[paramName]),
+            `${prefix}: mod.connect(tstNode[${paramName}])`)
+            .notThrow();
+
+        refNode.connect(merger, 0, 0);
+        tstNode.connect(merger, 0, 1);
+
+        // Go!
+        refNode.start();
+        tstNode.start();
+        mod.start();
+
+        const buffer = await context.startRendering();
+        let expected = buffer.getChannelData(0);
+        let actual = buffer.getChannelData(1);
+
+        // Quick sanity check that output isn't zero.  This means we messed up
+        // the connections or automations or the buffer source.
+        should(expected, `Expected k-rate ${paramName} AudioParam with input`)
+            .notBeConstantValueOf(0);
+        should(actual, `Actual k-rate ${paramName} AudioParam with input`)
+            .notBeConstantValueOf(0);
+
+        // The expected and actual results must be EXACTLY the same.
+        should(actual, `k-rate ${paramName} AudioParam with input`)
+            .beCloseToArray(expected, {absoluteThreshold: 0});
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html
new file mode 100644
index 00000000000..fcf66f2e3ef
--- /dev/null
+++ b/tests/wpt/web-platform-tests/webaudio/the-audio-api/the-audioparam-interface/k-rate-delay-connections.html
@@ -0,0 +1,156 @@
+<!doctype html>
+<html>
+  <head>
+    <title>k-rate AudioParams with inputs for DelayNode</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+  </head>
+
+  <body>
+    <script>
+      let audit = Audit.createTaskRunner();
+
+      // Power-of-two to eliminate round-off in computing time and frames, but
+      // is otherwise arbitrary.
+      const sampleRate = 8192;
+
+      // Arbitrary duration except it must be greater than or equal to 1.
+      const testDuration = 1.5;
+
+      audit.define(
+          {label: 'delayTime', description: `DelayNode delayTime k-rate input`},
+          async (task, should) => {
+            // Two channels:  0 = test result, 1 = expected result.
+            let context = new OfflineAudioContext({
+              numberOfChannels: 2,
+              sampleRate: sampleRate,
+              length: testDuration * sampleRate
+            });
+
+            let merger = new ChannelMergerNode(
+                context, {numberOfInputs: context.destination.channelCount});
+            merger.connect(context.destination);
+
+            // Test the DelayNode by having a reference node (refNode) that uses
+            // k-rate automations of delayTime. The test node (testNode) sets
+            // delayTime to k-rate with a connected input that has the same
+            // automation vlaues as the reference node.  The test passes if the
+            // output from each node is identical to each other.
+
+            // Just some non-constant source.
+            let src = new OscillatorNode(context);
+
+            // The end value and time for the linear ramp.  These values are
+            // chosen so that the delay advances faster than real time.
+            let endValue = 1.125;
+            let endTime = 1;
+
+            let refNode;
+
+            should(
+                () => refNode = new DelayNode(context),
+                `refNode = new DelayNode(context)`)
+                .notThrow();
+
+            should(
+                () => refNode.delayTime.automationRate = 'k-rate',
+                `refNode.delayTime.automationRate = 'k-rate'`)
+                .notThrow();
+
+            should(
+                () => refNode.delayTime.setValueAtTime(0, 0),
+                `refNode.delayTime.setValueAtTime(0, 0)`)
+                .notThrow();
+
+            should(
+                () => refNode.delayTime.linearRampToValueAtTime(
+                    endValue, endTime),
+                `refNode.delayTime.linearRampToValueAtTime(${endValue}, ${
+                    endTime})`)
+                .notThrow();
+
+            let testNode;
+
+            should(
+                () => testNode = new DelayNode(context),
+                `testNode = new DelayNode(context)`)
+                .notThrow();
+
+            should(
+                () => testNode.delayTime.automationRate = 'k-rate',
+                `testNode.delayTime.automationRate = 'k-rate'`)
+                .notThrow();
+
+            let testMod;
+
+            should(
+                () => testMod = new ConstantSourceNode(context),
+                `testMod = new ConstantSourceNode(context)`)
+                .notThrow();
+
+            should(
+                () => testMod.offset.setValueAtTime(0, 0),
+                `testMod.offset.setValueAtTime(0, 0)`)
+                .notThrow();
+
+            should(
+                () => testMod.offset.linearRampToValueAtTime(endValue, endTime),
+                `testMod.offset.linearRampToValueAtTime(${endValue}, ${
+                    endTime})`)
+                .notThrow();
+
+            should(
+                () => testMod.connect(testNode.delayTime),
+                `testMod.connect(testNode.delayTime)`)
+                .notThrow();
+
+            // Connect up everything and go!
+            src.connect(testNode).connect(merger, 0, 0);
+            src.connect(refNode).connect(merger, 0, 1);
+
+            src.start();
+            testMod.start();
+
+            const buffer = await context.startRendering();
+            let expected = buffer.getChannelData(0);
+            let actual = buffer.getChannelData(1);
+
+            // Quick sanity check that output isn't zero.  This means we messed
+            // up the connections or automations or the buffer source.
+            should(expected, `Expected k-rate delayTime AudioParam with input`)
+                .notBeConstantValueOf(0);
+            should(actual, `Actual k-rate delayTime AudioParam with input`)
+                .notBeConstantValueOf(0);
+
+            // Quick sanity check.  The amount of delay after one render is
+            // endValue * 128 / sampleRate.  But after 1 render, time has
+            // advanced 128/sampleRate.  Hence, the delay exceeds the time by
+            // (endValue - 1)*128/sampleRate sec or (endValue - 1)*128 frames.
+            // This means the output must be EXACTLY zero for this many frames
+            // in the second render.
+            let zeroFrames = (endValue - 1) * RENDER_QUANTUM_FRAMES;
+            should(
+                actual.slice(
+                    RENDER_QUANTUM_FRAMES, RENDER_QUANTUM_FRAMES + zeroFrames),
+                `output[${RENDER_QUANTUM_FRAMES}, ${
+                    RENDER_QUANTUM_FRAMES + zeroFrames - 1}]`)
+                .beConstantValueOf(0);
+            should(
+                actual.slice(
+                    RENDER_QUANTUM_FRAMES + zeroFrames,
+                    2 * RENDER_QUANTUM_FRAMES),
+                `output[${RENDER_QUANTUM_FRAMES + zeroFrames}, ${
+                    2 * RENDER_QUANTUM_FRAMES - 1}]`)
+                .notBeConstantValueOf(0);
+
+            // The expected and actual results must be EXACTLY the same.
+            should(actual, `k-rate delayTime AudioParam with input`)
+                .beCloseToArray(expected, {absoluteThreshold: 0});
+          });
+
+      audit.run();
+    </script>
+  </body>
+  </html>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/webdriver/tests/support/__init__.py b/tests/wpt/web-platform-tests/webdriver/tests/support/__init__.py
index fda74ce835c..a7b33cc15f4 100644
--- a/tests/wpt/web-platform-tests/webdriver/tests/support/__init__.py
+++ b/tests/wpt/web-platform-tests/webdriver/tests/support/__init__.py
@@ -3,6 +3,10 @@ import sys
 from .merge_dictionaries import merge_dictionaries
 
 platform_name = {
+    # From Python version 3.3: On Linux, sys.platform doesn't contain the major version anymore.
+    # It is always 'linux'. See
+    # https://docs.python.org/3/library/sys.html#sys.platform
+    "linux": "linux",
     "linux2": "linux",
     "win32": "windows",
     "cygwin": "windows",
diff --git a/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay.https.html b/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay.https.html
index 15eac78d928..e6f7a9d455c 100644
--- a/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay.https.html
+++ b/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay.https.html
@@ -106,6 +106,7 @@ let watcherStep = new Event("watcherstep");
 let watcherDone = new Event("watcherdone");
 
 let testInput = function(overlayElement, session, fakeDeviceController, t) {
+  let debug = xr_debug.bind(this, 'testInput');
 
   // Use two DIVs for this test. "inner_a" uses a "beforexrselect" handler
   // that uses preventDefault(). Controller interactions with it should trigger
@@ -135,30 +136,38 @@ let testInput = function(overlayElement, session, fakeDeviceController, t) {
       fakeDeviceController.simulateInputSourceConnection(SCREEN_CONTROLLER);
   session.requestReferenceSpace('viewer').then(function(viewerSpace) {
     // Press the primary input button and then release it a short time later.
+    debug('got viewerSpace');
     session.requestAnimationFrame((time, xrFrame) => {
+      debug('got rAF 1');
       input_source.setOverlayPointerPosition(inner_a.offsetLeft + 1,
                                              inner_a.offsetTop + 1);
       input_source.startSelection();
 
       session.requestAnimationFrame((time, xrFrame) => {
+        debug('got rAF 2');
         input_source.endSelection();
 
         session.requestAnimationFrame((time, xrFrame) => {
+          debug('got rAF 3');
           // Need to process one more frame to allow select to propagate.
           session.requestAnimationFrame((time, xrFrame) => {
+            debug('got rAF 4');
             session.dispatchEvent(watcherStep);
 
             assert_true(got_beforexrselect);
 
             session.requestAnimationFrame((time, xrFrame) => {
+              debug('got rAF 5');
               input_source.setOverlayPointerPosition(inner_b.offsetLeft + 1,
                                                      inner_b.offsetTop + 1);
               input_source.startSelection();
 
               session.requestAnimationFrame((time, xrFrame) => {
+                debug('got rAF 6');
                 input_source.endSelection();
 
                 session.requestAnimationFrame((time, xrFrame) => {
+                  debug('got rAF 7');
                   // Need to process one more frame to allow select to propagate.
                   session.dispatchEvent(watcherDone);
                 });
@@ -173,6 +182,8 @@ let testInput = function(overlayElement, session, fakeDeviceController, t) {
 };
 
 let testCrossOriginContent = function(overlayElement, session, fakeDeviceController, t) {
+  let debug = xr_debug.bind(this, 'testCrossOriginContent');
+
   let iframe = document.getElementById('iframe');
   assert_true(iframe != null);
   let inner_b = document.getElementById('inner_b');
@@ -192,27 +203,34 @@ let testCrossOriginContent = function(overlayElement, session, fakeDeviceControl
   session.requestReferenceSpace('viewer').then(function(viewerSpace) {
     // Press the primary input button and then release it a short time later.
     session.requestAnimationFrame((time, xrFrame) => {
+      debug('got rAF 1');
       input_source.setOverlayPointerPosition(iframe.offsetLeft + 1,
                                              iframe.offsetTop + 1);
       input_source.startSelection();
 
       session.requestAnimationFrame((time, xrFrame) => {
+        debug('got rAF 2');
         input_source.endSelection();
 
         session.requestAnimationFrame((time, xrFrame) => {
+          debug('got rAF 3');
           // Need to process one more frame to allow select to propagate.
           session.requestAnimationFrame((time, xrFrame) => {
+            debug('got rAF 4');
             session.dispatchEvent(watcherStep);
 
             session.requestAnimationFrame((time, xrFrame) => {
+              debug('got rAF 5');
               input_source.setOverlayPointerPosition(inner_b.offsetLeft + 1,
                                                      inner_b.offsetTop + 1);
               input_source.startSelection();
 
               session.requestAnimationFrame((time, xrFrame) => {
+                debug('got rAF 6');
                 input_source.endSelection();
 
                 session.requestAnimationFrame((time, xrFrame) => {
+                  debug('got rAF 7');
                   // Need to process one more frame to allow select to propagate.
                   session.dispatchEvent(watcherDone);
                 });
diff --git a/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay_hit_test.https.html b/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay_hit_test.https.html
index 406efe8be33..820dd7118a4 100644
--- a/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay_hit_test.https.html
+++ b/tests/wpt/web-platform-tests/webxr/dom-overlay/ar_dom_overlay_hit_test.https.html
@@ -35,6 +35,7 @@ const fakeDeviceInitParams = {
   views: VALID_VIEWS,
   viewerOrigin: IDENTITY_TRANSFORM,
   supportedFeatures: ALL_FEATURES,
+  world: createFakeWorld(5.0, 2.0, 5.0),  // see webxr_test_constants_fake_world.js for details
 };
 
 const hitTestOptionsInit = {
@@ -58,40 +59,54 @@ const testCrossOriginContent = function(overlayElement, session, fakeDeviceContr
   const iframe = document.getElementById('iframe');
   const inner_b = document.getElementById('inner_b');
 
+  let debug = xr_debug.bind(this, 'testCrossOriginContent');
+
   const input_source =
       fakeDeviceController.simulateInputSourceConnection(screen_controller_init);
+  debug('start');
   return session.requestReferenceSpace('viewer').then(function(viewerSpace) {
+    debug('got viewerSpace');
     return session.requestHitTestSourceForTransientInput(hitTestOptionsInit)
                   .then((hitTestSource) => {
-      // Press the primary input button and then release it a short time later.
-      session.requestAnimationFrame((time, xrFrame) => {
-        input_source.setOverlayPointerPosition(iframe.offsetLeft + 1,
-                                               iframe.offsetTop + 1);
-        input_source.startSelection();
-
+      debug('got hitTestSource');
+      return new Promise((resolve) => {
+        // Press the primary input button and then release it a short time later.
         session.requestAnimationFrame((time, xrFrame) => {
-          input_source.endSelection();
-
-          // There should be no results for transient input for cross origin content:
-          const results = xrFrame.getHitTestResultsForTransientInput(hitTestSource);
-          t.step(() => {
-            assert_true(results.length === 0, "Hit test results should be suppressed for cross-origin content");
-          });
+          debug('got rAF 1');
+          input_source.setOverlayPointerPosition(iframe.offsetLeft + 1,
+                                                 iframe.offsetTop + 1);
+          input_source.startSelection();
 
           session.requestAnimationFrame((time, xrFrame) => {
-            // Need to process one more frame to allow select to propagate
+            input_source.endSelection();
+
+            // There should be no results for transient input for cross origin content:
+            const results = xrFrame.getHitTestResultsForTransientInput(hitTestSource);
+            t.step(() => {
+              assert_equals(results.length, 0, "Hit test results should be suppressed for cross-origin content");
+            });
 
             session.requestAnimationFrame((time, xrFrame) => {
-              input_source.setOverlayPointerPosition(inner_b.offsetLeft + 1,
-                                                      inner_b.offsetTop + 1);
-              input_source.startSelection();
+              debug('got rAF 2');
+              // Need to process one more frame to allow select to propagate
 
               session.requestAnimationFrame((time, xrFrame) => {
-                input_source.endSelection();
+                debug('got rAF 3');
+                input_source.setOverlayPointerPosition(inner_b.offsetLeft + 1,
+                                                       inner_b.offsetTop + 1);
+                input_source.startSelection();
 
-                const results = xrFrame.getHitTestResultsForTransientInput(hitTestSource);
-                t.step(() => {
-                  assert_true(results.length === 1, "Hit test results should not be for cross-origin content");
+                session.requestAnimationFrame((time, xrFrame) => {
+                  debug('got rAF 4');
+                  input_source.endSelection();
+
+                  const results = xrFrame.getHitTestResultsForTransientInput(hitTestSource);
+                  t.step(() => {
+                    // TODO(bialpio): this assertion is currently failing, FIXME
+                    assert_equals(results.length, 1, "Hit test results should be available for same-origin content");
+                  });
+                  debug('resolving');
+                  resolve();
                 });
               });
             });
diff --git a/tests/wpt/web-platform-tests/webxr/getViewerPose_emulatedPosition.https.html b/tests/wpt/web-platform-tests/webxr/getViewerPose_emulatedPosition.https.html
index 201a9b72208..d3f83dad26a 100644
--- a/tests/wpt/web-platform-tests/webxr/getViewerPose_emulatedPosition.https.html
+++ b/tests/wpt/web-platform-tests/webxr/getViewerPose_emulatedPosition.https.html
@@ -16,9 +16,12 @@
     };
 
     let testFunction = function(session, fakeDeviceController, t) {
+      let debug = xr_debug.bind(this, 'testFunction');
       return session.requestReferenceSpace('local')
         .then((referenceSpace) => new Promise((resolve, reject) => {
+          debug('refSpace promise');
           function CheckPositionNotEmulated(time, vrFrame){
+            debug('rAF 1: checkPositionNotEmulated');
             t.step(() => {
               let pose = vrFrame.getViewerPose(referenceSpace);
               assert_not_equals(pose, null);
@@ -30,6 +33,7 @@
           }
 
           function CheckPositionEmulated(time, vrFrame) {
+            debug('rAF 2: checkPositionEmulated');
             t.step(() => {
               let pose = vrFrame.getViewerPose(referenceSpace);
               assert_not_equals(pose, null);
@@ -37,6 +41,7 @@
             });
 
             // Finished.
+            debug('resolve');
             resolve();
           }
 
diff --git a/tests/wpt/web-platform-tests/webxr/hit-test/ar_hittest_subscription_transientInputSources.https.html b/tests/wpt/web-platform-tests/webxr/hit-test/ar_hittest_subscription_transientInputSources.https.html
index 5d8b0322303..fdfadc5bd89 100644
--- a/tests/wpt/web-platform-tests/webxr/hit-test/ar_hittest_subscription_transientInputSources.https.html
+++ b/tests/wpt/web-platform-tests/webxr/hit-test/ar_hittest_subscription_transientInputSources.https.html
@@ -52,11 +52,13 @@ const fakeDeviceInitParams = {
 //                            Null entries in the array mean that the given entry will not be validated.
 let testFunctionGenerator = function(ray, expectedPoses, inputFromPointer, nextFrameExpectedPoses) {
   const testFunction = function(session, fakeDeviceController, t) {
+    let debug = xr_debug.bind(this, 'testFunction');
     return session.requestReferenceSpace('local').then((localRefSpace) => new Promise((resolve, reject) => {
 
       const input_source_controller = fakeDeviceController.simulateInputSourceConnection(screen_controller_init);
 
       session.requestAnimationFrame((time, frame) => {
+        debug('rAF 1');
         t.step(() => {
           assert_equals(session.inputSources.length, 1);
         });
@@ -74,6 +76,7 @@ let testFunctionGenerator = function(ray, expectedPoses, inputFromPointer, nextF
 
           // We got a hit test source, now get the results in subsequent rAFcb:
           session.requestAnimationFrame((time, frame) => {
+            debug('rAF 2');
             const results = frame.getHitTestResultsForTransientInput(hitTestSource);
 
             t.step(() => {
@@ -92,6 +95,7 @@ let testFunctionGenerator = function(ray, expectedPoses, inputFromPointer, nextF
             input_source_controller.setPointerOrigin(inputFromPointer, false);
 
             session.requestAnimationFrame((time, frame) => {
+              debug('rAF 3');
               const results = frame.getHitTestResultsForTransientInput(hitTestSource);
 
               t.step(() => {
@@ -105,6 +109,7 @@ let testFunctionGenerator = function(ray, expectedPoses, inputFromPointer, nextF
                 }
               });
 
+              debug('resolving');
               resolve();
             });
           });
diff --git a/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js b/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
index 72a21c0ff29..c9f7e81b094 100644
--- a/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
+++ b/tests/wpt/web-platform-tests/webxr/resources/webxr_util.js
@@ -7,13 +7,19 @@
 //
 //   --enable-blink-features=MojoJS,MojoJSTest
 
+// Debugging message helper, by default does nothing. Implementations can
+// override this.
+var xr_debug = function(name, msg) {}
+
 function xr_promise_test(name, func, properties) {
   promise_test(async (t) => {
     // Perform any required test setup:
+    xr_debug(name, 'setup');
 
     if (window.XRTest === undefined) {
       // Chrome setup
       await loadChromiumResources;
+      xr_debug = navigator.xr.test.Debug;
     }
 
     // Ensure that any devices are disconnected when done. If this were done in
@@ -22,9 +28,11 @@ function xr_promise_test(name, func, properties) {
     // interfere with the next test.
     t.add_cleanup(async () => {
       // Ensure system state is cleaned up.
+      xr_debug(name, 'cleanup');
       await navigator.xr.test.disconnectAllDevices();
     });
 
+    xr_debug(name, 'main');
     return func(t);
   }, name, properties);
 }
@@ -74,9 +82,12 @@ function xr_session_promise_test(
               })
               .then(() => new Promise((resolve, reject) => {
                       // Perform the session request in a user gesture.
+                      xr_debug(name, 'simulateUserActivation');
                       navigator.xr.test.simulateUserActivation(() => {
+                        xr_debug(name, 'document.hasFocus()=' + document.hasFocus());
                         navigator.xr.requestSession(sessionMode, sessionInit || {})
                             .then((session) => {
+                              xr_debug(name, 'session start');
                               testSession = session;
                               session.mode = sessionMode;
                               let glLayer = new XRWebGLLayer(session, gl, gllayerProperties);
@@ -87,9 +98,11 @@ function xr_session_promise_test(
                                   baseLayer: glLayer
                               });
                               sessionObjects.glLayer = glLayer;
+                              xr_debug(name, 'session.visibilityState=' + session.visibilityState);
                               resolve(func(session, testDeviceController, t, sessionObjects));
                             })
                             .catch((err) => {
+                              xr_debug(name, 'error: ' + err);
                               reject(
                                   'Session with params ' +
                                   JSON.stringify(sessionMode) +