diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 3ba00c74978..df93c43600a 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -8617,6 +8617,162 @@
      {}
     ]
    ],
+   "css/css-text-decor/text-decoration-001-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-001-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-002-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-002-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-003-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-003-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-004-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-004-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-040-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-040-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-040a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-040a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-041-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-041-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-044-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-044-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-045-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-045-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-046a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-046a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-048-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-048-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-048a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-048a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-049-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-049-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-082-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-082-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-085-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-085-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-090-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-090-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-090a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-090a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-091-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-091-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-091a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-091a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-092-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-092-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-092a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-092a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-095a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-095a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-096-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-096-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-096a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-096a-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-097-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-097-manual.html",
+     {}
+    ]
+   ],
+   "css/css-text-decor/text-decoration-097a-manual.html": [
+    [
+     "css/css-text-decor/text-decoration-097a-manual.html",
+     {}
+    ]
+   ],
    "css/css-text-decor/text-decoration-line-014.xht": [
     [
      "css/css-text-decor/text-decoration-line-014.xht",
@@ -13681,6 +13837,12 @@
      {}
     ]
    ],
+   "payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html": [
+    [
+     "payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html",
+     {}
+    ]
+   ],
    "payment-request/payment-response/payerdetailschange-updateWith-manual.https.html": [
     [
      "payment-request/payment-response/payerdetailschange-updateWith-manual.https.html",
@@ -19075,6 +19237,12 @@
      {}
     ]
    ],
+   "web-nfc/NFCWriter_push_signal-manual.https.html": [
+    [
+     "web-nfc/NFCWriter_push_signal-manual.https.html",
+     {}
+    ]
+   ],
    "web-nfc/nfc_hw_disabled-manual.https.html": [
     [
      "web-nfc/nfc_hw_disabled-manual.https.html",
@@ -197195,6 +197363,18 @@
      {}
     ]
    ],
+   "svg/extensibility/foreignObject/compositing-backface-visibility.html": [
+    [
+     "svg/extensibility/foreignObject/compositing-backface-visibility.html",
+     [
+      [
+       "/svg/extensibility/foreignObject/compositing-backface-visibility-ref.html",
+       "=="
+      ]
+     ],
+     {}
+    ]
+   ],
    "svg/extensibility/foreignObject/foreign-object-margin-collapsing.html": [
     [
      "svg/extensibility/foreignObject/foreign-object-margin-collapsing.html",
@@ -317462,6 +317642,11 @@
      {}
     ]
    ],
+   "svg/extensibility/foreignObject/compositing-backface-visibility-ref.html": [
+    [
+     {}
+    ]
+   ],
    "svg/extensibility/foreignObject/foreign-object-paints-before-rect-ref.html": [
     [
      {}
@@ -370137,6 +370322,18 @@
      }
     ]
    ],
+   "element-timing/background-image-multiple-elements.html": [
+    [
+     "element-timing/background-image-multiple-elements.html",
+     {}
+    ]
+   ],
+   "element-timing/background-image-stretched.html": [
+    [
+     "element-timing/background-image-stretched.html",
+     {}
+    ]
+   ],
    "element-timing/buffer-before-onload.html": [
     [
      "element-timing/buffer-before-onload.html",
@@ -370203,6 +370400,18 @@
      {}
     ]
    ],
+   "element-timing/multiple-background-images.html": [
+    [
+     "element-timing/multiple-background-images.html",
+     {}
+    ]
+   ],
+   "element-timing/observe-background-image.html": [
+    [
+     "element-timing/observe-background-image.html",
+     {}
+    ]
+   ],
    "element-timing/observe-child-element.html": [
     [
      "element-timing/observe-child-element.html",
@@ -415662,6 +415871,7 @@
     [
      "portals/portals-post-message.sub.html",
      {
+      "testdriver": true,
       "timeout": "long"
      }
     ]
@@ -471125,162 +471335,6 @@
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-   "css/css-text-decor/text-decoration-040a.html": [
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@@ -602208,109 +602262,109 @@
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    "support"
   ],
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+   "manual"
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@@ -612445,47 +612499,47 @@
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-   "c2bde5a8e7124b782bee4f5b33c704222ae7e205",
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   "css/css-transforms/transform3d-scale-007-ref.html": [
-   "f476aa9c77b4e5b19cf29a35d5a9c916fb8ad32a",
+   "b719044a5695c1f500144a3423d10a9fa8ba2c3d",
    "support"
   ],
   "css/css-transforms/transform3d-scale-007.html": [
-   "e9c199700a81d515739ff8bb4df03ffcc0e15c40",
+   "88261b7ad65dee6a2235c8df9bef43ad7c430dee",
    "reftest"
   ],
   "css/css-transforms/transform3d-sorting-001.html": [
@@ -642620,6 +642674,14 @@
    "7cd0be939f16e8aea7b00ff2b13a06102e26cc4d",
    "testharness"
   ],
+  "element-timing/background-image-multiple-elements.html": [
+   "669f94d6b0189ba387cf90c1b49c7d4120319673",
+   "testharness"
+  ],
+  "element-timing/background-image-stretched.html": [
+   "8f93b43524f7b3d051af90d9807a3f30ad299ae7",
+   "testharness"
+  ],
   "element-timing/buffer-before-onload.html": [
    "805777f29c297a22497d3e4f07b6ea462b0a0b7c",
    "testharness"
@@ -642664,6 +642726,14 @@
    "dbcad248e3aea0d148416275adeec93e20d8c267",
    "testharness"
   ],
+  "element-timing/multiple-background-images.html": [
+   "ca349fec45f6ae4bde53dbe03de673d19d295794",
+   "testharness"
+  ],
+  "element-timing/observe-background-image.html": [
+   "0669b4c4d83b6c2e81de94beb7db15c6ca775d1b",
+   "testharness"
+  ],
   "element-timing/observe-child-element.html": [
    "9166a4b0e6d129c356d74da2b81a6e02c08105b6",
    "testharness"
@@ -659109,7 +659179,7 @@
    "testharness"
   ],
   "html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html": [
-   "03a9b5d454473872f0d321b74524518438372fac",
+   "d099a8a0f8d3f41f08dd825fd42b1b1947e15956",
    "testharness"
   ],
   "html/semantics/embedded-content/media-elements/playing-the-media-resource/pause-move-to-other-document.html": [
@@ -669333,7 +669403,7 @@
    "support"
   ],
   "interfaces/webrtc-stats.idl": [
-   "b6b30e88268d27dd6e9a902768521fcf74c3a514",
+   "0992b341e1fe3cede699c09eeb5838bd1e7a3999",
    "support"
   ],
   "interfaces/webrtc.idl": [
@@ -681864,6 +681934,10 @@
    "85a44a819cd8555e032520f887cf89508bdb98b6",
    "manual"
   ],
+  "payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html": [
+   "912ceaa6086fd616908115d4f17117e76867d830",
+   "manual"
+  ],
   "payment-request/payment-response/payerdetailschange-updateWith-manual.https.html": [
    "30e27088e7de1384489fcf9aa72391d353e34b36",
    "manual"
@@ -682641,7 +682715,7 @@
    "testharness"
   ],
   "portals/portals-post-message.sub.html": [
-   "9fc6f6192cfa114053ae3ae6976e1c4491f299ad",
+   "fe58e25180ecec148e8f5bee4d79eaa366268476",
    "testharness"
   ],
   "portals/portals-rendering.html": [
@@ -682717,7 +682791,7 @@
    "support"
   ],
   "portals/resources/portal-post-message-cross-origin-portal.sub.html": [
-   "4aca1bde6983027fc363f318f22cfaaa156dee59",
+   "577c10ac666536eed4ed4a62fdc4924f06a47b6f",
    "support"
   ],
   "portals/resources/portal-post-message-during-activate-window.html": [
@@ -682725,7 +682799,7 @@
    "support"
   ],
   "portals/resources/portal-post-message-portal.html": [
-   "c657894f8ac4ec83e6a3ed3fd66dbc3be3b0c985",
+   "539048c13f5e8c21f7bda5e7d7e1b4772efb5ded",
    "support"
   ],
   "portals/resources/portals-adopt-predecessor-portal.html": [
@@ -699708,6 +699782,14 @@
    "120941444a4898197d6b6001f9908a6cd48b62ba",
    "support"
   ],
+  "svg/extensibility/foreignObject/compositing-backface-visibility-ref.html": [
+   "b0f504974a552545053a1a5d7c1e55eefa527fdb",
+   "support"
+  ],
+  "svg/extensibility/foreignObject/compositing-backface-visibility.html": [
+   "1551e25f8f9675dd5cde0dc656635656f5d33023",
+   "reftest"
+  ],
   "svg/extensibility/foreignObject/containing-block.html": [
    "da0728c96b5d0eb81435efad329bdcc3ee4dfb26",
    "testharness"
@@ -712697,9 +712779,13 @@
    "testharness"
   ],
   "web-nfc/NFCWriter_push.https.html": [
-   "f5a0a84273681f7c2af402061fd3e6fb456cac76",
+   "d53e5023a1b6aa6133a6f878888d5450c252678d",
    "testharness"
   ],
+  "web-nfc/NFCWriter_push_signal-manual.https.html": [
+   "f45d0bbbd49821d0de8953884f5dbb908e904f83",
+   "manual"
+  ],
   "web-nfc/idlharness.https.window.js": [
    "ab0d6cd191a5b576674c0c038087ef17ece4cdfd",
    "testharness"
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 ff5b07adb77..e89282b04a1 100644
--- a/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
+++ b/tests/wpt/metadata/css/cssom-view/elementsFromPoint-iframes.html.ini
@@ -1,5 +1,5 @@
 [elementsFromPoint-iframes.html]
-  expected: TIMEOUT
+  expected: CRASH
   [elementsFromPoint on the root document for points in iframe elements]
     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 e1632fe21a0..b9facf16b81 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -22,7 +22,7 @@
     expected: NOTRUN
 
   [<iframe>: combined response Content-Type: text/plain */*;charset=gbk]
-    expected: FAIL
+    expected: TIMEOUT
 
   [fetch(): separate response Content-Type: text/html;x=" text/plain]
     expected: NOTRUN
@@ -163,7 +163,7 @@
     expected: NOTRUN
 
   [<iframe>: combined response Content-Type: text/html;" " text/plain]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Request: combined response Content-Type: text/plain;charset=gbk;x=foo text/plain]
     expected: NOTRUN
@@ -172,7 +172,7 @@
     expected: NOTRUN
 
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain ";charset=GBK]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Response: combined response Content-Type: text/html;x=" text/plain]
     expected: NOTRUN
@@ -202,7 +202,7 @@
     expected: NOTRUN
 
   [<iframe>: separate response Content-Type: text/html;" " text/plain]
-    expected: FAIL
+    expected: TIMEOUT
 
   [fetch(): separate response Content-Type: text/plain */*;charset=gbk]
     expected: NOTRUN
@@ -286,7 +286,7 @@
     expected: NOTRUN
 
   [<iframe>: separate response Content-Type: text/html;" \\" text/plain ";charset=GBK]
-    expected: FAIL
+    expected: TIMEOUT
 
   [fetch(): combined response Content-Type: text/html;" " text/plain]
     expected: NOTRUN
@@ -310,11 +310,32 @@
     expected: NOTRUN
 
   [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
+    expected: TIMEOUT
 
   [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+    expected: TIMEOUT
+
+  [<iframe>: combined response Content-Type: text/html;" text/plain]
+    expected: TIMEOUT
+
+  [<iframe>: combined response Content-Type: text/html */*]
+    expected: TIMEOUT
+
+  [<iframe>: separate response Content-Type: text/html;" text/plain]
+    expected: TIMEOUT
+
+  [<iframe>: separate response Content-Type: text/html */*;charset=gbk]
+    expected: TIMEOUT
+
+  [<iframe>: separate response Content-Type: */* text/html]
     expected: FAIL
 
+  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
+    expected: TIMEOUT
+
+  [<iframe>: separate response Content-Type: text/html;" \\" text/plain]
+    expected: TIMEOUT
+
+  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html.ini
index 2e0a6add6fc..6d9188c1e52 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html.ini
@@ -2,3 +2,6 @@
   [Test looping edge case to verify http://crbug.com/364442.]
     expected: FAIL
 
+  [play() with loop set to true after playback ended]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
new file mode 100644
index 00000000000..8cc42056d34
--- /dev/null
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
@@ -0,0 +1,10 @@
+[non-active-document.html]
+  [DOMParser]
+    expected: FAIL
+
+  [createHTMLDocument]
+    expected: FAIL
+
+  [<template>]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini b/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
deleted file mode 100644
index 9e522297c94..00000000000
--- a/tests/wpt/metadata/html/semantics/interactive-elements/the-details-element/toggleEvent.html.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[toggleEvent.html]
-  [Calling open twice on 'details' fires only one toggle event]
-    expected: FAIL
-
-  [Setting open=true to opened 'details' element should not fire a toggle event at the 'details' element]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini b/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
deleted file mode 100644
index dbea4f293ad..00000000000
--- a/tests/wpt/mozilla/meta/css/transition_calc_implicit.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[transition_calc_implicit.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-001.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-001-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-001.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-001-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-002.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-002-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-002.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-002-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-003.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-003-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-003.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-003-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-004.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-004-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-004.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-004-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-040a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-041.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-041-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-041.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-041-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-044.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-044-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-044.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-044-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-045.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-045-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-045.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-045-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-046a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-046a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-046a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-046a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-048a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-049.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-049-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-049.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-049-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-082.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-082-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-082.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-082-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-085.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-085-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-085.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-085-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-090a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-091a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-092a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-095a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-095a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-095a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-095a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-096a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097a.html b/tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097a-manual.html
similarity index 100%
rename from tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097a.html
rename to tests/wpt/web-platform-tests/css/css-text-decor/text-decoration-097a-manual.html
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-notref.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-notref.html
index c2bde5a8e71..ab5ae4cb402 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-notref.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-notref.html
@@ -6,7 +6,8 @@
   </head>
   <body>
     <div style="width: 100px; height: 100px">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-ref.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-ref.html
index 213d81bed75..05e7b31d27b 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001-ref.html
@@ -7,7 +7,8 @@
   </head>
   <body>
     <div style="transform: scaleX(2) scaleY(2); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001.html
index 36fe800feed..d6287818bf7 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-001.html
@@ -14,7 +14,8 @@
   </head>
   <body>
     <div style="transform: scale3D(2,2,2); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-002.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-002.html
index 723dfc8a949..a677aaedd22 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-002.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-002.html
@@ -15,7 +15,8 @@
   </head>
   <body>
     <div style="transform: rotatex(90deg) scale3D(2,1,2) rotatex(-90deg); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-003.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-003.html
index 0bb647b8056..e613ba520ea 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-003.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-003.html
@@ -14,7 +14,8 @@
   </head>
   <body>
     <div style="transform: scaleX(2) scaleY(2) scaleZ(2); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-004.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-004.html
index f5a161c06f0..ed8247cc5bd 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-004.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-004.html
@@ -13,7 +13,8 @@
   <body>
     <p>Nothing should appear except this sentence.</p>
     <div style="transform: scale3d(2, 2, 0); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005-ref.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005-ref.html
index 201300cfda0..270e413ddb2 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005-ref.html
@@ -7,7 +7,8 @@
   </head>
   <body>
     <div style="transform: scaleY(2); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005.html
index fda6f7f5ca1..524323c1c61 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-005.html
@@ -14,7 +14,8 @@
   </head>
   <body>
     <div style="transform: rotatex(90deg) scale3D(1,1,2) rotatex(-90deg); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-006.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-006.html
index b821776ee49..b3dd5378f4b 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-006.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-006.html
@@ -14,7 +14,8 @@
   </head>
   <body>
     <div style="transform: rotatex(90deg) scaleZ(2) rotatex(-90deg); transform-origin: 0 0; width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007-ref.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007-ref.html
index f476aa9c77b..b719044a569 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007-ref.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007-ref.html
@@ -7,7 +7,8 @@
   </head>
   <body>
     <div style="transform: scaleY(-1); width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007.html b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007.html
index e9c199700a8..88261b7ad65 100644
--- a/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007.html
+++ b/tests/wpt/web-platform-tests/css/css-transforms/transform3d-scale-007.html
@@ -12,7 +12,8 @@
   </head>
   <body>
     <div style="transform: rotatex(180deg) scaleZ(-1); width: 100px; height: 100px;">
-      Test Text
+      <div style="background: blue; width: 50px; height: 50px;"></div>
+      <div style="background: lime; width: 50px; height: 50px; margin-left: 50px;"></div>
     </div>
   </body>
 </html>
diff --git a/tests/wpt/web-platform-tests/element-timing/background-image-multiple-elements.html b/tests/wpt/web-platform-tests/element-timing/background-image-multiple-elements.html
new file mode 100644
index 00000000000..669f94d6b01
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/background-image-multiple-elements.html
@@ -0,0 +1,74 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: background image affecting multiple elements</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+.my_div {
+  background-image: url('resources/square100.png');
+}
+#div1 {
+  width: 100px;
+  height: 100px;
+}
+#div2 {
+  width: 200px;
+  height: 100px;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  async_test(function (t) {
+    let beforeRender = performance.now();
+    let numObservedElements = 0;
+    let observedDiv1 = false;
+    let observedDiv2 = false;
+    const index = window.location.href.lastIndexOf('/');
+    const pathname = window.location.href.substring(0, index) +
+        '/resources/square100.png';
+    const observer = new PerformanceObserver(
+      t.step_func(function(entryList) {
+        entryList.getEntries().forEach(entry => {
+          numObservedElements++;
+          if (entry.id == 'div1') {
+            observedDiv1 = true;
+            checkElement(entry, pathname, 'et1', 'div1', beforeRender);
+            // Div is in the top left corner.
+            checkRect(entry, [0, 100, 0, 100]);
+            checkNaturalSize(entry, 100, 100);
+          }
+          else if (entry.id == 'div2') {
+            observedDiv2 = true;
+            checkElement(entry, pathname, 'et2', 'div2', beforeRender);
+            // Div is below div1, on the left.
+            checkRect(entry, [0, 200, 100, 200]);
+            checkNaturalSize(entry, 100, 100);
+          }
+          else {
+            assert_unreached("Should not observe other elements!");
+          }
+          if (numObservedElements === 2) {
+            assert_true(observedDiv1);
+            assert_true(observedDiv2);
+            t.done();
+          }
+        });
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Background image affecting various elements is observed.');
+</script>
+<div id="div1" class="my_div" elementtiming="et1">
+  <img width=50 height=50 src='resources/circle.svg'/>
+</div>
+<div width=200 height=100 id="div2" class="my_div" elementtiming="et2">
+  Sample text inside div.
+</div>
+<div id="div3"/>
+  I am a div that should not be observed!
+</div>
+</body>
diff --git a/tests/wpt/web-platform-tests/element-timing/background-image-stretched.html b/tests/wpt/web-platform-tests/element-timing/background-image-stretched.html
new file mode 100644
index 00000000000..8f93b43524f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/background-image-stretched.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe larger element with stretched background image</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+#target {
+  width: 200px;
+  height: 150px;
+  background-image: url('resources/square100.png');
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  let beforeRender = performance.now();
+  async_test(function (t) {
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        const index = window.location.href.lastIndexOf('/');
+        const pathname = window.location.href.substring(0, index) +
+            '/resources/square100.png';
+        checkElement(entry, pathname, 'my_div', 'target', beforeRender);
+        // The background image extends to occupy to full size of the div.
+        checkRect(entry, [0, 200, 0, 150]);
+        // The natural size of the square remains unchanged.
+        checkNaturalSize(entry, 100, 100);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Element with background image shows correct image size.');
+</script>
+<div id='target' elementtiming='my_div'></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/element-timing/multiple-background-images.html b/tests/wpt/web-platform-tests/element-timing/multiple-background-images.html
new file mode 100644
index 00000000000..ca349fec45f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/multiple-background-images.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe element with multiple background images</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+#target {
+  width: 200px;
+  height: 200px;
+  background-image: url('resources/circle.svg'), url('resources/square100.png');
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  let beforeRender = performance.now();
+  async_test(function (t) {
+    let numObservedElements = 0;
+    let observedCircle = false;
+    let observedSquare = false;
+    const index = window.location.href.lastIndexOf('/');
+    const pathname = window.location.href.substring(0, index) + '/resources/';
+    const observer = new PerformanceObserver(
+      t.step_func(entryList => {
+        entryList.getEntries().forEach(entry => {
+          numObservedElements++;
+          if (entry.name.endsWith('square100.png')) {
+            observedSquare = true;
+            checkElement(entry, pathname + 'square100.png', 'multi', 'target', beforeRender);
+            checkRect(entry, [0, 200, 0, 200]);
+            checkNaturalSize(entry, 100, 100);
+          }
+          else if (entry.name.endsWith('circle.svg')) {
+            observedCircle = true;
+            checkElement(entry, pathname + 'circle.svg', 'multi', 'target', beforeRender);
+            checkRect(entry, [0, 200, 0, 200]);
+            checkNaturalSize(entry, 200, 200);
+          }
+          else {
+            assert_unreached("Should not have observed an entry with different name!");
+          }
+          if (numObservedElements === 2) {
+            assert_true(observedCircle);
+            assert_true(observedSquare);
+            t.done();
+          }
+        });
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Element with two background images receives both.');
+</script>
+<div id='target' elementtiming='multi'></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/element-timing/observe-background-image.html b/tests/wpt/web-platform-tests/element-timing/observe-background-image.html
new file mode 100644
index 00000000000..0669b4c4d83
--- /dev/null
+++ b/tests/wpt/web-platform-tests/element-timing/observe-background-image.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe element with background image</title>
+<body>
+<style>
+body {
+  margin: 0;
+}
+#target {
+  width: 100px;
+  height: 50px;
+  background-image: url('/images/black-rectangle.png');
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+  let beforeRender = performance.now();
+  async_test(function (t) {
+    const observer = new PerformanceObserver(
+      t.step_func_done(function(entryList) {
+        assert_equals(entryList.getEntries().length, 1);
+        const entry = entryList.getEntries()[0];
+        const index = window.location.href.lastIndexOf('/');
+        const pathname = window.location.href.substring(0, index - 14) +
+            'images/black-rectangle.png';
+        checkElement(entry, pathname, 'my_div', 'target', beforeRender);
+        checkRect(entry, [0, 100, 0, 50]);
+        checkNaturalSize(entry, 100, 50);
+      })
+    );
+    observer.observe({entryTypes: ['element']});
+  }, 'Element with elementtiming attribute and background image is observable.');
+</script>
+<div id='target' elementtiming='my_div'></div>
+</body>
diff --git a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html
index 03a9b5d4544..d099a8a0f8d 100644
--- a/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html
+++ b/tests/wpt/web-platform-tests/html/semantics/embedded-content/media-elements/playing-the-media-resource/loop-from-ended.tentative.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<title>Test looping edge case to verify http://crbug.com/364442.</title>
+<title>play() with loop set to true after playback ended</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/media.js"></script>
@@ -10,6 +10,8 @@
 // Once ended, set "loop" to true. Call play.
 // Verify that "seeked" event fires, seeking back to the beginning.
 // Pause video and end test.
+// Chromium bug: https://crbug.com/364442
+// Spec issue: https://github.com/whatwg/html/issues/4487
 async_test(function(t) {
     var video = document.querySelector("video");
 
diff --git a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
index b6b30e88268..0992b341e1f 100644
--- a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
@@ -207,6 +207,8 @@ dictionary RTCAudioReceiverStats : RTCAudioHandlerStats {
              unsigned long long concealedSamples;
              unsigned long long silentConcealedSamples;
              unsigned long long concealmentEvents;
+             unsigned long long insertedSamplesForDeceleration;
+             unsigned long long removedSamplesForAcceleration;
 };
 
 dictionary RTCDataChannelStats : RTCStats {
diff --git a/tests/wpt/web-platform-tests/payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html b/tests/wpt/web-platform-tests/payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html
new file mode 100644
index 00000000000..912ceaa6086
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/payment-response/payerdetailschange-updateWith-immediate-manual.https.html
@@ -0,0 +1,68 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Dispatching PaymentRequestUpdateEvent for "payerdetailschange"</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="helpers.js"></script>
+<script>
+function testImmediateUpdate({ textContent: testName }) {
+  promise_test(async t => {
+    const response = await getPaymentResponse({ requestPayerName: true });
+    const eventPromise = new Promise((resolve, reject) => {
+      response.addEventListener(
+        "payerdetailchange",
+        ev => {
+          // Forces updateWith() to be run in the next event loop tick so that
+          // [[waitForUpdate]] is already true when it runs.
+          t.step_timeout(() => {
+            try {
+              ev.updateWith({});
+              resolve(); // This is bad.
+            } catch (err) {
+              reject(err); // this is good.
+            }
+          });
+        },
+        { once: true }
+      );
+    });
+
+    const retryPromise = response.retry({
+      payer: { name: "Change me!" },
+    });
+    await promise_rejects(
+      t,
+      "InvalidStateError",
+      eventPromise,
+      "The event loop already spun, so [[waitForUpdate]] is now true"
+    );
+    await retryPromise;
+    await response.complete("success");
+  }, testName.trim());
+}
+</script>
+<h2>Handling PaymentResponse.prototype.onpayerdetailchange events</h2>
+<p>
+  The test brings up the Payment Request UI window.
+  When shown the payment sheet, use any details and hit pay.
+</p>
+<p>
+  When asked to retry the payment:
+</p>
+<ol>
+  <li>
+    <p>
+      Change payer's name to anything.
+    </p>
+    <button onclick="testImmediateUpdate(this);">
+      updateWith() must be called immediately, otherwise must throw an InvalidStateError.
+    </button>
+  </li>
+  <li>
+    <button onclick="done();">DONE!</button>
+  </li>
+</ol>
+<small>
+  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/OWNERS">owners</a>.
+</small>
diff --git a/tests/wpt/web-platform-tests/portals/portals-post-message.sub.html b/tests/wpt/web-platform-tests/portals/portals-post-message.sub.html
index 9fc6f6192cf..fe58e25180e 100644
--- a/tests/wpt/web-platform-tests/portals/portals-post-message.sub.html
+++ b/tests/wpt/web-platform-tests/portals/portals-post-message.sub.html
@@ -3,7 +3,10 @@
 <meta name="timeout" content="long">
 <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>
 <body>
+  <input id="input"/>
   <script>
     const sameOriginUrl = "resources/portal-post-message-portal.html"
     const crossOriginUrl = "http://{{hosts[alt][www]}}:{{ports[http][0]}}/portals/resources/portal-post-message-cross-origin-portal.sub.html"
@@ -35,20 +38,33 @@
       });
     }
 
+    function postMessageWithMessagePorts(portal, message, targetOrigin) {
+      return new Promise((resolve, reject) => {
+        var channel = new MessageChannel();
+        channel.port1.onmessage = e => {
+          channel.port1.close();
+          resolve(e.data);
+        };
+        portal.postMessage(message, targetOrigin, [channel.port2]);
+      });
+    }
+
     promise_test(async () => {
       var portal = await createAndInsertPortal(sameOriginUrl);
       var message = "test message";
-      var {origin, data} = await postMessage(portal, message, "*");
+      var {origin, data, sourceIsPortalHost} = await postMessage(portal, message, "*");
       assert_equals(data, message);
       assert_equals(origin, window.location.origin);
+      assert_true(sourceIsPortalHost);
     }, "postMessage message received by portalHost");
 
     promise_test(async () => {
       var portal = await createAndInsertPortal(crossOriginUrl);
       var message = "test message";
-      var {origin, data} = await postMessage(portal, message, "*");
+      var {origin, data, sourceIsPortalHost} = await postMessage(portal, message, "*");
       assert_equals(data, message);
       assert_equals(origin, window.location.origin);
+      assert_true(sourceIsPortalHost);
     }, "postMessage message received by portalHost in cross-origin portal");
 
     promise_test(async () => {
@@ -71,12 +87,100 @@
       assert_equals(data, message);
     }, "postMessage received by portal host in cross-origin portal when target origin is specified");
 
+    promise_test(async () => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      var message = {
+        prop1: "value1",
+        prop2: 2.5,
+        prop3: [1, 2, "3"],
+        prop4: {
+          prop4_1: "value4_1"
+        }
+      }
+      var {data} = await postMessage(portal, message);
+      assert_object_equals(data, message);
+    }, "postMessage with message object");
+
+    promise_test(async () => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      var message = "test message";
+      var {data} = await postMessageWithMessagePorts(portal, message, "*");
+      assert_equals(data, message);
+    }, "postMessage with message ports and same-origin portal");
+
+    promise_test(async () => {
+      var portal = await createAndInsertPortal(crossOriginUrl);
+      var message = "test message";
+      var {data} = await postMessageWithMessagePorts(portal, message, "*");
+      assert_equals(data, message);
+    }, "postMessage with message ports and cross-origin portal");
+
+    promise_test(async () => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      var arrayBuffer = new ArrayBuffer(5);
+      var int8View = new Int8Array(arrayBuffer);
+      for (var i = 0; i < int8View.length; i++)
+        int8View[i] = i;
+      var message = {
+        arrayBuffer: arrayBuffer
+      };
+      var {data} = await postMessage(portal, message, "*");
+      assert_array_equals([0, 1, 2, 3, 4], int8View);
+      assert_array_equals([0, 1, 2, 3, 4], data.array);
+    }, "postMessage with array buffer without transfer");
+
+    promise_test(async () => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      var arrayBuffer = new ArrayBuffer(5);
+      var int8View = new Int8Array(arrayBuffer);
+      for (var i = 0; i < int8View.length; i++)
+        int8View[i] = i;
+      var message = {
+        arrayBuffer: arrayBuffer
+      };
+      var {data} = await postMessage(portal, message, "*", [arrayBuffer]);
+      assert_equals(int8View.length, 0);
+      assert_array_equals(data.array, [0, 1, 2, 3, 4]);
+    }, "postMessage with transferred array buffer");
+
+    promise_test(async t => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+
+      var {gotUserActivation} = await postMessage(portal, "test");
+      assert_false(gotUserActivation);
+
+      var {gotUserActivation, userActivation} = await postMessage(portal, "test", {includeUserActivation: true});
+      assert_true(gotUserActivation);
+      assert_false(userActivation.isActive);
+      assert_false(userActivation.hasBeenActive);
+
+      await test_driver.click(document.getElementById("input"));
+      assert_true(navigator.userActivation.isActive);
+      assert_true(navigator.userActivation.hasBeenActive);
+
+      var {userActivation} = await postMessage(portal, "test", {includeUserActivation: true});
+      assert_true(userActivation.isActive, "should have sent gesture");
+      assert_true(userActivation.hasBeenActive);
+    }, "postMessage with includeUserActivation");
+
     promise_test(async t => {
       var portal = document.createElement("portal");
       return promise_rejects(t, "InvalidStateError",
                              postMessage(portal, "test message"));
     }, "cannot call postMessage on portal without portal browsing context");
 
+    promise_test(async t => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      return promise_rejects(t, "DataCloneError",
+                             postMessage(portal, document.body));
+    }, "postMessage should fail if message serialization fails");
+
+    promise_test(async t => {
+      var portal = await createAndInsertPortal(sameOriginUrl);
+      return promise_rejects(t, new TypeError(),
+                             postMessage(portal, "test", "*", [null]));
+    }, "postMessage should fail with invalid ports");
+
     async function waitForMessage(channelName) {
       var bc = new BroadcastChannel(channelName);
       return new Promise((resolve, reject) => {
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-post-message-cross-origin-portal.sub.html b/tests/wpt/web-platform-tests/portals/resources/portal-post-message-cross-origin-portal.sub.html
index 4aca1bde698..577c10ac666 100644
--- a/tests/wpt/web-platform-tests/portals/resources/portal-post-message-cross-origin-portal.sub.html
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-post-message-cross-origin-portal.sub.html
@@ -13,8 +13,14 @@
     window.portalHost.addEventListener("message", e => {
       var message = {
         origin: e.origin,
-        data: e.data
+        data: e.data,
+        sourceIsPortalHost: e.source === window.portalHost
       };
+      if (e.ports.length > 0) {
+        e.ports[0].postMessage(message);
+        e.ports[0].close();
+        return;
+      }
       forwardingIframe.contentWindow.postMessage(message, "*");
     });
   </script>
diff --git a/tests/wpt/web-platform-tests/portals/resources/portal-post-message-portal.html b/tests/wpt/web-platform-tests/portals/resources/portal-post-message-portal.html
index c657894f8ac..539048c13f5 100644
--- a/tests/wpt/web-platform-tests/portals/resources/portal-post-message-portal.html
+++ b/tests/wpt/web-platform-tests/portals/resources/portal-post-message-portal.html
@@ -6,8 +6,27 @@
   window.portalHost.addEventListener("message", e => {
     var message = {
       origin: e.origin,
-      data: e.data
+      data: e.data,
+      sourceIsPortalHost: e.source === window.portalHost,
+      gotUserActivation: !!e.userActivation,
+      userActivation: {
+        isActive: e.userActivation && e.userActivation.isActive,
+        hasBeenActive: e.userActivation && e.userActivation.hasBeenActive
+      }
     };
+
+    if (e.data.arrayBuffer) {
+      message.data = {
+        array: Array.from(new Uint8Array(e.data.arrayBuffer))
+      };
+    }
+
+    if (e.ports.length > 0) {
+      e.ports[0].postMessage(message);
+      e.ports[0].close();
+      return;
+    }
+
     bc = new BroadcastChannel("portals-post-message");
     bc.postMessage(message);
     bc.close();
diff --git a/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility-ref.html b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility-ref.html
new file mode 100644
index 00000000000..b0f504974a5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility-ref.html
@@ -0,0 +1,8 @@
+<!doctype HTML>
+<title>Basic backface-visibility compositing works referece</title>
+<link rel="author" title="Chris Harrelson" href="chrishtr@chromium.org">
+<svg>
+  <foreignObject>
+    <div>Test</div>
+  </foreignObject>
+</svg>
diff --git a/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility.html b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility.html
new file mode 100644
index 00000000000..1551e25f8f9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/svg/extensibility/foreignObject/compositing-backface-visibility.html
@@ -0,0 +1,13 @@
+<!doctype HTML>
+<title>Basic backface-visibility compositing works.</title>
+<link rel="author" title="Chris Harrelson" href="chrishtr@chromium.org">
+<link rel="match" href="compositing-backface-visibility-ref.html">
+<link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#embedded-ForeignObjectElement"/>
+<style>
+  * { backface-visibility: hidden }
+</style>
+<svg>
+  <foreignObject>
+    <div style="will-change: transform">Test</div>
+  </foreignObject>
+</svg>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
index f5a0a842736..d53e5023a1b 100644
--- a/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
+++ b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push.https.html
@@ -74,6 +74,25 @@ const invalid_syntax_messages =
       createMessage([createRecord('json', 'custom/app+json', test_json_data)]),
     ];
 
+const invalid_signals = [
+  "string",
+  123,
+  {},
+  true,
+  Symbol(),
+  () => {},
+  self
+]
+
+const non_strings = [
+  123,
+  {},
+  true,
+  Symbol(),
+  () => {},
+  self
+]
+
 promise_test(t => {
   const writer = new NFCWriter();
   const promises = [];
@@ -94,13 +113,19 @@ promise_test(t => {
   return Promise.all(promises);
 }, "'Test that promise is rejected with SyntaxError if NDEFMessageSource contains invalid records.");
 
-promise_test(t => {
+promise_test(async t => {
   const writer = new NFCWriter();
   const controller = new AbortController();
   const p = writer.push(test_text_data, { signal: controller.signal });
-  controller.abort();
-  return promise_rejects(t, 'NoModificationAllowedError', p);
-}, "NFCWriter.push should fail if the instance has already initiated NFC data transfer.");
+  const rejected = promise_rejects(t, 'AbortError', p);
+  let callback_called = false;
+  t.step_timeout(() => {
+    callback_called = true;
+    controller.abort();
+  }, 10);
+  await rejected;
+  assert_true(callback_called, 'timeout should have caused the abort');
+}, "NFCWriter.push should fail if abort push request before push happends.");
 
 promise_test(t => {
   const writer = new NFCWriter();
@@ -111,6 +136,16 @@ promise_test(t => {
   return promise_rejects(t, 'AbortError', writer.push(test_text_data, { signal: controller.signal }));
 }, "NFCWriter.push should fail if signal's aborted flag is set.");
 
+promise_test(t => {
+  const writer = new NFCWriter();
+  const promises = [];
+  invalid_signals.forEach(invalid_signal => {
+    promises.push(
+      promise_rejects(t, 'TypeError', writer.push(test_text_data, { signal: invalid_signal })));
+  });
+  return Promise.all(promises);
+}, "NFCWriter.push should fail if signal is not an AbortSignal.");
+
 promise_test(t => {
   const writer = new NFCWriter();
   return promise_rejects(t, new TypeError(), writer.push(test_text_data, { timeout: "invalid"}));
@@ -185,4 +220,32 @@ promise_test(() => {
   });
 }, 'Test that WebNFC API is not accessible from iframe context.');
 
+promise_test(t => {
+  const writer = new NFCWriter();
+  const promises = [];
+  non_strings.forEach(invalid_url => {
+    promises.push(
+      promise_rejects(t, new TypeError(), writer.push({
+        url: invalid_url,
+        records: [{ recordType: "text", data: 'Hello World' }]
+      }));
+    );
+  });
+  return Promise.all(promises);
+}, "Test that promise is rejected with TypeError if NDEFMessageSource contains non-string url.");
+
+promise_test(t => {
+  const writer = new NFCWriter();
+  const promises = [];
+  non_strings.forEach(invalid_serialNumber => {
+    promises.push(
+      promise_rejects(t, new TypeError(), writer.push({
+        serialNumber: invalid_serialNumber,
+        records: [{ recordType: "text", data: 'Hello World' }]
+      }));
+    );
+  });
+  return Promise.all(promises);
+}, "Test that promise is rejected with TypeError if NDEFMessageSource contains non-string serialNumber.");
+
 </script>
diff --git a/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push_signal-manual.https.html b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push_signal-manual.https.html
new file mode 100644
index 00000000000..f45d0bbbd49
--- /dev/null
+++ b/tests/wpt/web-platform-tests/web-nfc/NFCWriter_push_signal-manual.https.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Web NFC Test: NFCWriter signal test</title>
+<link rel="author" title="Intel" href="http://www.intel.com"/>
+<link rel="help" href="https://w3c.github.io/web-nfc/"/>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/nfc_help.js"></script>
+<meta name="flags" content="interact">
+
+<p>Tap an NFC tag to the test device with NFC support.</p>
+
+<p>Note: All the actions need to be done in 60 seconds, otherwise it will get TIMEOUT.</p>
+
+<div id="log"></div>
+
+<script>
+
+"use strict";
+
+setup({ explicit_timeout: true });
+
+promise_test(async t => {
+  const writer = new NFCWriter();
+  const reader = new NFCReader();
+  const controller = new AbortController();
+
+  const p1 = writer.push(test_text_data, { signal: controller.signal });
+  const p2 = writer.push(test_text_data);
+
+  // Even though push request is grantable, this abort should be processed synchronously.
+  controller.abort();
+  await promise_rejects(t, 'AbortError', p1);
+  await p2;
+
+  const readerWatcher = new EventWatcher(t, reader, ["reading", "error"]);
+  reader.start();
+  const event = await readerWatcher.wait_for("reading");
+  for (let record of event.message.records) {
+    assert_equals(record.data, test_text_data);
+  }
+}, "Synchronously signaled abort.");
+
+</script>