diff --git a/tests/wpt/metadata-layout-2020/FileAPI/url/url-charset.window.js.ini b/tests/wpt/metadata-layout-2020/FileAPI/url/url-charset.window.js.ini
deleted file mode 100644
index 7248ba77bd5..00000000000
--- a/tests/wpt/metadata-layout-2020/FileAPI/url/url-charset.window.js.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[url-charset.window.html]
-  expected: TIMEOUT
-  [Blob charset should override any auto-detected charset.]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
deleted file mode 100644
index 4bfb0c2053a..00000000000
--- a/tests/wpt/metadata-layout-2020/css/CSS2/floats/hit-test-floats-004.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
index cb2edcb5dcd..6425f4beda1 100644
--- a/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -5,6 +5,9 @@
   [[data-expected-height\] 7]
     expected: FAIL
 
-  [[data-expected-height\] 4]
+  [[data-expected-height\] 1]
+    expected: FAIL
+
+  [[data-expected-height\] 2]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/css/css-transitions/event-dispatch.tentative.html.ini b/tests/wpt/metadata-layout-2020/css/css-transitions/event-dispatch.tentative.html.ini
index 0f5910791a6..52aad9e40d8 100644
--- a/tests/wpt/metadata-layout-2020/css/css-transitions/event-dispatch.tentative.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/css-transitions/event-dispatch.tentative.html.ini
@@ -77,3 +77,6 @@
   [After -> Active]
     expected: FAIL
 
+  [Cancel the transition after it finishes]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
deleted file mode 100644
index 4c79907309b..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/CaretPosition-001.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[CaretPosition-001.html]
-  [Element at (400, 100)]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e274..00000000000
--- a/tests/wpt/metadata-layout-2020/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
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 96174515421..92131edd34a 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
@@ -321,15 +321,9 @@
   [<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 */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: */* text/html]
     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 d2df9b78483..5c001592859 100644
--- a/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata-layout-2020/fetch/content-type/script.window.js.ini
@@ -56,3 +56,6 @@
   [separate text/javascript x/x]
     expected: FAIL
 
+  [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 7277f622b20..aa6eb8f6085 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
@@ -11,6 +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%20%2Cnosniff]
+  [X-Content-Type-Options%3A%20'NosniFF']
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata-layout-2020/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
index 09ae27d7480..5c3ac06f42a 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
@@ -171,6 +171,3 @@
   [XHTML img usemap="#hash-id"]
     expected: FAIL
 
-  [HTML (standards) IMG usemap="no-hash-name"]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index e63fe7c263e..c6f45be1eb2 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 93673c2a0db..338d283eb0e 100644
--- a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_escaping-3.html]
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_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 f4f994c5d6f..7a36937927c 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
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-3.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/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
deleted file mode 100644
index fca4d908c89..00000000000
--- a/tests/wpt/metadata-layout-2020/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[module-static-import-delayed.html]
-  [document.write in an imported module]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata-layout-2020/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini b/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata-layout-2020/webmessaging/with-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/FileAPI/url/url-charset.window.js.ini b/tests/wpt/metadata/FileAPI/url/url-charset.window.js.ini
deleted file mode 100644
index 7248ba77bd5..00000000000
--- a/tests/wpt/metadata/FileAPI/url/url-charset.window.js.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[url-charset.window.html]
-  expected: TIMEOUT
-  [Blob charset should override any auto-detected charset.]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index 37d6adcc99d..a18f9258d5e 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -24620,12 +24620,12 @@
    },
    "animation-worklet": {
     "worklet-animation-cancel.https.html": [
-     "3a28c7515db455ba50ed50135c5a5bb8534ae580",
+     "3b664ecddba8fb805b035d759a3b3cb109329274",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-cancel-ref.html",
+        "/animation-worklet/references/not-translated-box-ref.html",
         "=="
        ]
       ],
@@ -24633,12 +24633,12 @@
      ]
     ],
     "worklet-animation-get-timing-on-worklet-thread.https.html": [
-     "54d1c8bcc0c0a20d9af4e96ea240060ebd348982",
+     "4ba68d79e4de5544d36c826ad3b41613d9e3f289",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-get-timing-on-worklet-thread-ref.html",
+        "/animation-worklet/references/translated-box-ref.html",
         "=="
        ]
       ],
@@ -24646,12 +24646,12 @@
      ]
     ],
     "worklet-animation-local-time-after-duration.https.html": [
-     "adc90f1d3f6befa906473dd1bfb500b605431d0a",
+     "21293bc09b17591cb5dd8c2bbe3b09e726b4b5f3",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-local-time-after-duration-ref.html",
+        "/animation-worklet/references/not-translated-box-ref.html",
         "=="
        ]
       ],
@@ -24659,18 +24659,33 @@
      ]
     ],
     "worklet-animation-local-time-before-start.https.html": [
-     "addb16e7d1751280c8d4f3e0052b808ab807cd7e",
+     "a959b73c08d8c2a2a32fb5d6d3dbe8169b0c6512",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-local-time-before-start-ref.html",
+        "/animation-worklet/references/translated-box-ref.html",
         "=="
        ]
       ],
       {}
      ]
     ],
+    "worklet-animation-local-time-null-2.https.html": [
+     "9c499bac0ee51b7b41c9cf1ca5f917d096c9a756",
+     [
+      null,
+      [
+       [
+        "/animation-worklet/worklet-animation-local-time-null-2-ref.html",
+        "=="
+       ]
+      ],
+      {
+       "timeout": "long"
+      }
+     ]
+    ],
     "worklet-animation-pause-immediately.https.html": [
      "f9dcf30bc908adb4e6b260dd00263e434a9b9ae4",
      [
@@ -24698,12 +24713,12 @@
      ]
     ],
     "worklet-animation-set-keyframes.https.html": [
-     "017408494602ff51aec483ccc6dd0dd2f82bba4e",
+     "d3d02898db294b82bedda67b82b286cae9aeff06",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-set-keyframes-ref.html",
+        "/animation-worklet/references/translated-box-ref.html",
         "=="
        ]
       ],
@@ -24711,12 +24726,12 @@
      ]
     ],
     "worklet-animation-set-timing.https.html": [
-     "ac3f05f4234ac1036e388536c4237686b07e6037",
+     "6c5cd51300c5cbea15d094a5023d8b663fa759e6",
      [
       null,
       [
        [
-        "/animation-worklet/worklet-animation-set-timing-ref.html",
+        "/animation-worklet/references/translated-box-ref.html",
         "=="
        ]
       ],
@@ -147545,7 +147560,7 @@
        ]
       ],
       "flex-and-intrinsic-sizes-002.html": [
-       "1f93d0e3d0e2b6bff13351e92c7ffaba7cb68553",
+       "6b2df4e572094d424833e3a342431b11d7f4dc4a",
        [
         null,
         [
@@ -167553,7 +167568,7 @@
        ]
       ],
       "abspos-008.tentative.html": [
-       "c81e9fcf40547bf34c47ab11ca3fda307f5f77ed",
+       "429b14ac35feb710354b9133ba435dc7fd192808",
        [
         null,
         [
@@ -167865,7 +167880,111 @@
        ]
       ],
       "block-aspect-ratio-020.tentative.html": [
-       "3cb076252b0a356774cd4f9257c8561973a5d5d0",
+       "b07e91faf9860ea4b07d233103233b42e9ffd9c8",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-021.tentative.html": [
+       "0e9c1b6b0a2697d9f1ee6309e4255859ecc7d1ad",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-022.tentative.html": [
+       "1ee8021a3bbb428d9f7234590072986bd3ec4318",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-023.tentative.html": [
+       "e38cfe0cb26e47eea9c6c8c32a692d045c692a13",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-024.tentative.html": [
+       "d6f6716b99d527d421e892d80a79f9a31e84ec45",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-025.tentative.html": [
+       "6ce673672372a84bbba40bc455d4fa744848852e",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-026.tentative.html": [
+       "0e0ce5efe3aa8b83f64e8deee46bafb2c7144c58",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-027.tentative.html": [
+       "532f558b39deff2788e58865cc2ae3777a6d4716",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "block-aspect-ratio-028.tentative.html": [
+       "ec49bd4d7af834c3fea345b34b0eb05ff58f9e4d",
        [
         null,
         [
@@ -168318,6 +168437,32 @@
         ],
         {}
        ]
+      ],
+      "replaced-element-013.tentative.html": [
+       "bcbf653d68af4c1f908a59ca6e66e5752a09c833",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
+      ],
+      "replaced-element-014.tentative.html": [
+       "4c1ad16ce8624295251b73d1a14f53b9c9905610",
+       [
+        null,
+        [
+         [
+          "/css/reference/ref-filled-green-100px-square.xht",
+          "=="
+         ]
+        ],
+        {}
+       ]
       ]
      },
      "auto-scrollbar-inside-stf-abspos.html": [
@@ -248506,7 +248651,7 @@
   },
   "support": {
    ".azure-pipelines.yml": [
-    "cbd7b33b5d421e8dda64adfd8e25383e82173a5b",
+    "fbdef35656e149a16e00a71964f4aad1d6be2196",
     []
    ],
    ".codecov.yml": [
@@ -249589,8 +249734,12 @@
      []
     ],
     "references": {
+     "not-translated-box-ref.html": [
+      "96acf1ad96c7c41e870429d55142269f4468bb97",
+      []
+     ],
      "translated-box-ref.html": [
-      "c73f5a177bf70f3a71d981bc9f04b38c5afe9f1c",
+      "f1dde2e19b2ebad50dd29e693b2a81f7de2cc620",
       []
      ]
     },
@@ -249604,28 +249753,8 @@
       []
      ]
     },
-    "worklet-animation-cancel-ref.html": [
-     "d44927374703ef2b38d3ed0c9570609b62baec65",
-     []
-    ],
-    "worklet-animation-get-timing-on-worklet-thread-ref.html": [
-     "aad07d5f6f26692dc47ce0219a78d3c1a50c608a",
-     []
-    ],
-    "worklet-animation-local-time-after-duration-ref.html": [
-     "96acf1ad96c7c41e870429d55142269f4468bb97",
-     []
-    ],
-    "worklet-animation-local-time-before-start-ref.html": [
-     "cda4ca4132cabcb13719f12248773026b0642df2",
-     []
-    ],
-    "worklet-animation-set-keyframes-ref.html": [
-     "26bf33fdb403877f2e3adf9b8bb3fca6bf8301bb",
-     []
-    ],
-    "worklet-animation-set-timing-ref.html": [
-     "8c354a8b06f815d4f8000895964b59c3f6c242e4",
+    "worklet-animation-local-time-null-2-ref.html": [
+     "3b7a2b9258d0c2a210aaa389fadc3787c0da93a5",
      []
     ],
     "worklet-animation-start-delay-ref.html": [
@@ -271102,6 +271231,10 @@
     },
     "sandbox": {
      "support": {
+      "empty.html": [
+       "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+       []
+      ],
       "post-origin-on-load-worker.js": [
        "21ce5748ab8b1edbfd04c8f77a3fba54739a73d5",
        []
@@ -271134,6 +271267,22 @@
        "a7ea308208d81a9f9a2ec24004d5d1f72cf21f84",
        []
       ],
+      "sandboxed-service-worker.js": [
+       "d4971266f5cbc105f0381c8c40409050166b6564",
+       []
+      ],
+      "sandboxed-service-worker.js.headers": [
+       "1efcf8c226fac074c98d0a5a747856f532e5d84e",
+       []
+      ],
+      "sandboxed-shared-worker.js": [
+       "eb85eb41b4bd9efffd186dbd6be4004a2f707346",
+       []
+      ],
+      "sandboxed-shared-worker.js.headers": [
+       "1efcf8c226fac074c98d0a5a747856f532e5d84e",
+       []
+      ],
       "unsandboxed-post-property-to-opener.html": [
        "ebbb54d36d86fe3ee3696b7dc302de11cb4ac30c",
        []
@@ -323236,7 +323385,7 @@
       []
      ],
      "testharness-api.md": [
-      "72263dbd4ead3d0dc2340bcdc83064f9ea8dffa5",
+      "38997a2dcc945c3c569b1348313ba92dff5fec85",
       []
      ],
      "testharness-tutorial.md": [
@@ -330736,6 +330885,16 @@
        "0db28208a6d9731570398b1d83f8bf1ba32a4dec",
        []
       ],
+      "access-reporting": {
+       "property-indexed-getter.https.html.headers": [
+        "64f4d5fedffd208b7174c7d8e0bce4e99ce1ac0f",
+        []
+       ],
+       "property-named-getter.https.html.headers": [
+        "64f4d5fedffd208b7174c7d8e0bce4e99ce1ac0f",
+        []
+       ]
+      },
       "navigation-reporting": {
        "report-only-four-reports.https.html.sub.headers": [
         "5c886ad05386ec21dcc3722649a40653962d8519",
@@ -340773,7 +340932,7 @@
      []
     ],
     "performance-timeline.idl": [
-     "d3783858578c881b352e571deeb8cc4c9f0e6454",
+     "36107ddeea296df350a2f4da33fcc396d203eaae",
      []
     ],
     "periodic-background-sync.idl": [
@@ -350926,6 +351085,10 @@
        "f495a0c554537f1161981e19c12c597ba41ef2b2",
        []
       ],
+      "com.apple.SafariTechnologyPreview.plist": [
+       "122080972c9f63410062ee8d33d0ed0286af8f11",
+       []
+      ],
       "fyi_hook.yml": [
        "f02f3cd8224e0b3eb4f478318f0437f5a475f4e5",
        []
@@ -350955,7 +351118,7 @@
        []
       ],
       "install_safari.yml": [
-       "d0660d152bbdfc89f308bfc048cd2221e9ea7524",
+       "6c1b562d411a2aeecc30d3fbc1aed6362f3526e5",
        []
       ],
       "pip_install.yml": [
@@ -359172,7 +359335,7 @@
       []
      ],
      "urltestdata.json": [
-      "ded7107ff757d21fbc79939b92d0f709eba82764",
+      "bc79426526c1a5ea9a4c9d07fc9305b0409089f4",
       []
      ]
     }
@@ -377141,6 +377304,13 @@
       {}
      ]
     ],
+    "worklet-animation-local-time-null-1.https.html": [
+     "7db0a9721f67c59d6f453e32f3e2a65e064ff215",
+     [
+      null,
+      {}
+     ]
+    ],
     "worklet-animation-pause.https.html": [
      "417db9e37a61193a99908648e4cbc3be4c2e9618",
      [
@@ -385573,6 +385743,20 @@
        {}
       ]
      ],
+     "service-worker-sandbox.https.html": [
+      "8b7d72e0ef96d2fb309d7e8bddf0f37b5fcdee36",
+      [
+       null,
+       {}
+      ]
+     ],
+     "shared-worker-sandbox.html": [
+      "86b39b9ad4739ff0c07ffc2720142b68d7dd64e8",
+      [
+       null,
+       {}
+      ]
+     ],
      "window-reuse-sandboxed.html": [
       "a7a080daf72ee8ae97f5adf433f17c947892d4ce",
       [
@@ -407285,7 +407469,7 @@
       ]
      ],
      "event-dispatch.tentative.html": [
-      "9e4946cf336ad0d78b3b87426d121a39ffb98037",
+      "5ed01cdd2588d1a5a5226a9abb46f60dd441ed13",
       [
        null,
        {}
@@ -458326,7 +458510,7 @@
      "reporting": {
       "access-reporting": {
        "openee-accessed_openee-coop-ro.https.html": [
-        "1472afa63c1d61d54cb68b3f3d192778fd7381de",
+        "24943b03f39106596bef73612d7b286f02531ec2",
         [
          null,
          {
@@ -458335,7 +458519,7 @@
         ]
        ],
        "openee-accessed_openee-coop.https.html": [
-        "64dd07b5701a640244330435f88172a1c2c60984",
+        "07ba21a0c742bab4606dd27a6d0fd5b492a7b449",
         [
          null,
          {
@@ -458362,7 +458546,7 @@
         ]
        ],
        "opener-accessed_openee-coop-ro.https.html": [
-        "3e5180af6260a691e08ee649c87e68a6579e3c59",
+        "b8f9f22e7cbf4ca80fd152258b539b106b77dbb1",
         [
          null,
          {
@@ -458371,7 +458555,7 @@
         ]
        ],
        "opener-accessed_openee-coop.https.html": [
-        "e39dcfcec6a8bd9a5011944873d76d6689f80b34",
+        "ffce48de49627c02807316309b541f748e943d6c",
         [
          null,
          {
@@ -458397,8 +458581,26 @@
          }
         ]
        ],
+       "property-indexed-getter.https.html": [
+        "d2309e5fbd14c4dc987f8fde6ec02c41ca774819",
+        [
+         null,
+         {
+          "timeout": "long"
+         }
+        ]
+       ],
+       "property-named-getter.https.html": [
+        "2ab9093fcb58f1346854c443de41e3f8f2a00243",
+        [
+         null,
+         {
+          "timeout": "long"
+         }
+        ]
+       ],
        "property.https.html": [
-        "625fc94117768b792a27c148f609ccccef61507b",
+        "6a22cb2076cbfcf042926ef7249d98139651de53",
         [
          null,
          {
@@ -477918,6 +478120,15 @@
       {}
      ]
     ],
+    "input-timestamp.html": [
+     "02dde1ad5d740fb62c82994c05518cec4017dbaa",
+     [
+      null,
+      {
+       "testdriver": true
+      }
+     ]
+    ],
     "local-shift-without-viewport-shift.html": [
      "37729f1c13c298b5a2d95c46b7a4f199d8943022",
      [
@@ -487097,6 +487308,13 @@
        "testdriver": true
       }
      ]
+    ],
+    "secure-payment-confirmation.https.html": [
+     "860876e2e9bb750a266b33472753444532fe9a6a",
+     [
+      null,
+      {}
+     ]
     ]
    },
    "performance-timeline": {
@@ -487925,7 +488143,7 @@
    "pointerevents": {
     "compat": {
      "pointerevent_compat-mouse-events-when-removing-nodes.html": [
-      "88d03b7965efc241893b8fbfc4c8f2e2b0967bf5",
+      "6d13b0de354a140e472d42bd8b81b408fad52495",
       [
        null,
        {
diff --git a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini b/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
deleted file mode 100644
index 4bfb0c2053a..00000000000
--- a/tests/wpt/metadata/css/CSS2/floats/hit-test-floats-004.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[hit-test-floats-004.html]
-  [Miss float below something else]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
index 94a3570d26b..076c791cd3d 100644
--- a/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/metadata/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -8,6 +8,9 @@
   [[data-expected-height\] 3]
     expected: FAIL
 
-  [[data-expected-height\] 4]
+  [[data-expected-height\] 1]
+    expected: FAIL
+
+  [[data-expected-height\] 2]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/css/css-transitions/event-dispatch.tentative.html.ini b/tests/wpt/metadata/css/css-transitions/event-dispatch.tentative.html.ini
index 0f5910791a6..52aad9e40d8 100644
--- a/tests/wpt/metadata/css/css-transitions/event-dispatch.tentative.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/event-dispatch.tentative.html.ini
@@ -77,3 +77,6 @@
   [After -> Active]
     expected: FAIL
 
+  [Cancel the transition after it finishes]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini b/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
deleted file mode 100644
index 4c79907309b..00000000000
--- a/tests/wpt/metadata/css/cssom-view/CaretPosition-001.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[CaretPosition-001.html]
-  [Element at (400, 100)]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
new file mode 100644
index 00000000000..e38782d8c85
--- /dev/null
+++ b/tests/wpt/metadata/css/cssom-view/elementFromPoint-001.html.ini
@@ -0,0 +1,4 @@
+[elementFromPoint-001.html]
+  [CSSOM View - 5 - extensions to the Document interface]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini b/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
deleted file mode 100644
index e6e1f29e274..00000000000
--- a/tests/wpt/metadata/css/cssom-view/matchMedia-display-none-iframe.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[matchMedia-display-none-iframe.html]
-  expected: ERROR
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 048411678c0..5285b1d6cd2 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -321,15 +321,9 @@
   [<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 */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" text/plain]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
+  [<iframe>: combined response Content-Type: */* text/html]
     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 d2df9b78483..5c001592859 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -56,3 +56,6 @@
   [separate text/javascript x/x]
     expected: FAIL
 
+  [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 7277f622b20..aa6eb8f6085 100644
--- a/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
+++ b/tests/wpt/metadata/fetch/nosniff/parsing-nosniff.window.js.ini
@@ -11,6 +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%20%2Cnosniff]
+  [X-Content-Type-Options%3A%20'NosniFF']
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
deleted file mode 100644
index 87b07c3e670..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_1.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_1.html]
-  [Multiple history traversals from the same task]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
index 98163335e40..1de3f8d68b2 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/image-maps/image-map-processing-model/hash-name-reference.html.ini
@@ -172,6 +172,3 @@
   [XHTML img usemap="http://example.org/#garbage-before-hash-id"]
     expected: FAIL
 
-  [HTML (standards) IMG usemap="no-hash-name"]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index e63fe7c263e..c6f45be1eb2 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,5 +1,5 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index cb0211f1d21..f6a7aca3306 100644
--- a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/metadata/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index e440b1e38c6..dc856a3d5a3 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
@@ -1,6 +1,5 @@
 [iframe_sandbox_popups_nonescaping-3.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/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
deleted file mode 100644
index fca4d908c89..00000000000
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[module-static-import-delayed.html]
-  [document.write in an imported module]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
index 66bd350083b..a56bad443a2 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-analysernode-interface/realtimeanalyser-fft-scaling.html.ini
@@ -1,4 +1,5 @@
 [realtimeanalyser-fft-scaling.html]
+  expected: TIMEOUT
   [X 2048-point FFT peak position is not equal to 64. Got 0.]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/webmessaging/with-ports/017.html.ini b/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
deleted file mode 100644
index 064cf47545b..00000000000
--- a/tests/wpt/metadata/webmessaging/with-ports/017.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[017.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, about:blank]
-    expected: TIMEOUT
-
diff --git a/tests/wpt/web-platform-tests/.azure-pipelines.yml b/tests/wpt/web-platform-tests/.azure-pipelines.yml
index cbd7b33b5d4..fbdef35656e 100644
--- a/tests/wpt/web-platform-tests/.azure-pipelines.yml
+++ b/tests/wpt/web-platform-tests/.azure-pipelines.yml
@@ -37,7 +37,7 @@ jobs:
   displayName: 'affected tests: Safari Technology Preview'
   condition: eq(variables['Build.Reason'], 'PullRequest')
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -54,7 +54,7 @@ jobs:
   displayName: 'affected tests without changes: Safari Technology Preview'
   condition: eq(variables['Build.Reason'], 'PullRequest')
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -91,7 +91,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_infrastructure']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -120,7 +120,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   variables:
     HYPOTHESIS_PROFILE: ci
   steps:
@@ -138,7 +138,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -154,7 +154,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.tools_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -170,7 +170,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   variables:
     HYPOTHESIS_PROFILE: ci
   steps:
@@ -188,7 +188,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -204,7 +204,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -220,7 +220,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   variables:
     HYPOTHESIS_PROFILE: ci
   steps:
@@ -242,7 +242,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   # full checkout required
   - task: UsePythonVersion@0
@@ -262,7 +262,7 @@ jobs:
   dependsOn: decision
   condition: dependencies.decision.outputs['test_jobs.wpt_integration']
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   # full checkout required
   - task: UsePythonVersion@0
@@ -595,7 +595,7 @@ jobs:
     parallel: 5 # chosen to make runtime ~2h
   timeoutInMinutes: 180
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
@@ -633,7 +633,7 @@ jobs:
     parallel: 5 # chosen to make runtime ~2h
   timeoutInMinutes: 180
   pool:
-    vmImage: 'macOS-10.14'
+    vmImage: 'macOS-10.15'
   steps:
   - task: UsePythonVersion@0
     inputs:
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration-ref.html b/tests/wpt/web-platform-tests/animation-worklet/references/not-translated-box-ref.html
similarity index 100%
rename from tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration-ref.html
rename to tests/wpt/web-platform-tests/animation-worklet/references/not-translated-box-ref.html
diff --git a/tests/wpt/web-platform-tests/animation-worklet/references/translated-box-ref.html b/tests/wpt/web-platform-tests/animation-worklet/references/translated-box-ref.html
index c73f5a177bf..f1dde2e19b2 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/references/translated-box-ref.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/references/translated-box-ref.html
@@ -5,6 +5,7 @@
   height: 100px;
   transform: translateY(100px);
   background-color: green;
+  will-change: transform;
 }
 </style>
 
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel-ref.html
deleted file mode 100644
index d4492737470..00000000000
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel-ref.html
+++ /dev/null
@@ -1,11 +0,0 @@
-<!DOCTYPE html>
-<title>Reference for Canceling a playing WorkletAnimation should remove the effect</title>
-<style>
-#box {
-  width: 100px;
-  height: 100px;
-  background-color: blue;
-}
-</style>
-
-<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel.https.html
index 3a28c7515db..3b664ecddba 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-cancel.https.html
@@ -2,7 +2,7 @@
 <title>Canceling a playing WorkletAnimation should remove the effect</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="Canceling a playing animation should remove the effect">
-<link rel="match" href="worklet-animation-cancel-ref.html">
+<link rel="match" href="references/not-translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
@@ -12,7 +12,7 @@
   #box {
     width: 100px;
     height: 100px;
-    background-color: blue;
+    background-color: green;
   }
 </style>
 
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread-ref.html
deleted file mode 100644
index aad07d5f6f2..00000000000
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread-ref.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<title>Reference for Animation Worklet should have access to effect timing from within the worklet thread</title>
-<style>
-#box {
-  width: 100px;
-  height: 100px;
-  background-color: green;
-  transform: translateY(100px);
-}
-</style>
-
-<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread.https.html
index 54d1c8bcc0c..4ba68d79e4d 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-get-timing-on-worklet-thread.https.html
@@ -2,7 +2,7 @@
 <title>Animation Worklet should have access to effect timing from within the worklet thread</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="Animation Worklet should have access to effect timing from within the worklet thread">
-<link rel="match" href="worklet-animation-get-timing-on-worklet-thread-ref.html">
+<link rel="match" href="references/translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html
index adc90f1d3f6..21293bc09b1 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-after-duration.https.html
@@ -2,7 +2,7 @@
 <title>Animation Worklet local time set after duration</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="If an effect doesn't have fill-mode specified, setting its local time beyond its duration makes the animation inactive.">
-<link rel="match" href="worklet-animation-local-time-after-duration-ref.html">
+<link rel="match" href="references/not-translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html
deleted file mode 100644
index cda4ca4132c..00000000000
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start-ref.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<title>Reference for Animation Worklet local time set before start</title>
-<style>
-#box {
-  width: 100px;
-  height: 100px;
-  background-color: green;
-  will-change: transform;
-  transform: translateY(200px);
-}
-</style>
-
-<div id="box"></div>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html
index addb16e7d17..a959b73c08d 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-before-start.https.html
@@ -2,7 +2,7 @@
 <title>Animation Worklet local time set before start</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="The local time should be trimmed by the duration, e.g. this is equivalent to effect.localTime = 0">
-<link rel="match" href="worklet-animation-local-time-before-start-ref.html">
+<link rel="match" href="references/translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
@@ -23,7 +23,7 @@
     const box = document.getElementById('box');
     const effect = new KeyframeEffect(box,
       [
-      { transform: 'translateY(200px)' },
+      { transform: 'translateY(100px)' },
       { transform: 'translateY(0px)' }
       ], {
         duration: 1000,
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-1.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-1.https.html
new file mode 100644
index 00000000000..7db0a9721f6
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-1.https.html
@@ -0,0 +1,163 @@
+<!DOCTYPE html>
+<title>Setting localTime to null means effect does not apply</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="common.js"></script>
+
+<style>
+.box {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  display: inline-block;
+}
+</style>
+
+<div>
+<div class="box" id="target1"></div>
+<div class="box" id="target2"></div>
+<div class="box" id="target3"></div>
+<div class="box" id="target4"></div>
+</div>
+
+
+<script>
+promise_test(async t => {
+  await runInAnimationWorklet(`
+    registerAnimator("blank_animator", class {
+      animate(currentTime, effect) {
+        // Unset effect.localTime is equivalent to 'null'
+      }
+    });
+  `);
+  const target = document.getElementById('target1');
+
+  const animation = new WorkletAnimation('blank_animator',
+    new KeyframeEffect(target,
+      [
+        { transform: 'translateY(100px)' },
+        { transform: 'translateY(200px)' }
+      ], {
+        duration: 1000,
+      }
+    )
+  );
+  animation.play();
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).transform, "matrix(1, 0, 0, 1, 0, 0)");
+}, "A worklet which never sets localTime has no effect.");
+
+promise_test(async t => {
+  await runInAnimationWorklet(`
+    registerAnimator("null_animator", class {
+      animate(currentTime, effect) {
+        effect.localTime = null;
+      }
+    });
+  `);
+  const target = document.getElementById('target2');
+
+  const animation = new WorkletAnimation('null_animator',
+    new KeyframeEffect(target,
+      [
+        { transform: 'translateY(100px)' },
+        { transform: 'translateY(200px)' }
+      ], {
+        duration: 1000,
+      }
+    )
+  );
+  animation.play();
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).transform, "matrix(1, 0, 0, 1, 0, 0)");
+}, "A worklet which sets localTime to null has no effect.");
+
+promise_test(async t => {
+  await runInAnimationWorklet(`
+    registerAnimator("drop_animator", class {
+      animate(currentTime, effect) {
+        if (currentTime < 500)
+          effect.localTime = 500;
+        else if (currentTime < 1000)
+          effect.localTime = 0;
+        else
+          effect.localTime = null;
+      }
+    });
+  `);
+  const target = document.getElementById('target3');
+
+  const animation = new WorkletAnimation('drop_animator',
+    new KeyframeEffect(target,
+      [
+        { transform: 'translateY(100px)' },
+        { transform: 'translateY(200px)' }
+      ], {
+        duration: 1000,
+      }
+    )
+  );
+  animation.play();
+  await waitForAsyncAnimationFrames(5);
+  assert_equals(getComputedStyle(target).transform, "matrix(1, 0, 0, 1, 0, 150)",
+      "The animation has an effect at first");
+
+  await waitForAnimationFrameWithCondition(() => animation.currentTime > 500);
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).transform, "matrix(1, 0, 0, 1, 0, 100)",
+      "The effect correctly changes");
+
+  await waitForAnimationFrameWithCondition(() => animation.currentTime > 1000);
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).transform, "matrix(1, 0, 0, 1, 0, 0)",
+      "The effect stops on nulling of localTime");
+
+}, "A worklet which changes localTime to from a number to null has no effect on transform.");
+
+promise_test(async t => {
+  await runInAnimationWorklet(`
+    registerAnimator("drop2_animator", class {
+      animate(currentTime, effect) {
+        if (currentTime < 500)
+          effect.localTime = 500;
+        else if (currentTime < 1000)
+          effect.localTime = 0;
+        else
+          effect.localTime = null;
+      }
+    });
+  `);
+  const target = document.getElementById('target4');
+
+  const animation = new WorkletAnimation('drop2_animator',
+    new KeyframeEffect(target,
+      [
+        { backgroundColor: 'red' },
+        { backgroundColor: 'blue' }
+      ], {
+        duration: 1000,
+      }
+    )
+  );
+  animation.play();
+  await waitForAsyncAnimationFrames(5);
+  assert_equals(getComputedStyle(target).backgroundColor, "rgb(128, 0, 128)",
+      "The animation has an effect at first");
+
+  await waitForAnimationFrameWithCondition(() => animation.currentTime > 500);
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).backgroundColor, "rgb(255, 0, 0)",
+      "The effect correctly changes");
+
+  await waitForAnimationFrameWithCondition(() => animation.currentTime > 1000);
+  await waitForAsyncAnimationFrames(1);
+  assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 128, 0)",
+      "The effect stops on nulling of localTime");
+
+}, "A worklet which changes localTime to from a number to null has no effect on backgroundColor.");
+
+
+</script>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2-ref.html
new file mode 100644
index 00000000000..3b7a2b9258d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Setting localTime to null means effect does not apply (reftest)</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+
+<style>
+.box {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  display: inline-block;
+}
+
+#control {
+  background-color: red;
+  transform: translateY(100px);
+}
+</style>
+
+<div>
+<div class="box" id="target1"></div>
+<div class="box" id="target2"></div>
+<div class="box" id="target3"></div>
+<div class="box" id="target4"></div>
+<div class="box" id="control"></div>
+</div>
+
+</script>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2.https.html
new file mode 100644
index 00000000000..9c499bac0ee
--- /dev/null
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-local-time-null-2.https.html
@@ -0,0 +1,110 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Setting localTime to null means effect does not apply (reftest)</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+<link rel="match" href="worklet-animation-local-time-null-2-ref.html">
+<meta name="timeout" content="long">
+
+<script src="/common/reftest-wait.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="common.js"></script>
+
+<style>
+.box {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  display: inline-block;
+}
+</style>
+
+<div>
+<div class="box" id="target1"></div>
+<div class="box" id="target2"></div>
+<div class="box" id="target3"></div>
+<div class="box" id="target4"></div>
+<div class="box" id="control"></div>
+</div>
+
+
+<script>
+runInAnimationWorklet(`
+  registerAnimator("blank_animator", class {
+    animate(currentTime, effect) {
+      // Unset effect.localTime is equivalent to 'null'
+    }
+  });
+
+  registerAnimator("null_animator", class {
+    animate(currentTime, effect) {
+      effect.localTime = null;
+    }
+  });
+
+  registerAnimator("drop_animator", class {
+    animate(currentTime, effect) {
+      if (currentTime < 500)
+        effect.localTime = 500;
+      else if (currentTime < 1000)
+        effect.localTime = 0;
+      else
+        effect.localTime = null;
+    }
+  });
+
+  registerAnimator("add_animator", class {
+    animate(currentTime, effect) {
+      if (currentTime < 1000)
+        effect.localTime = 500;
+      else
+        effect.localTime = 0;
+    }
+  });
+`).then(() => {
+
+  const start_animation = (animator, targetId, keyframes) => {
+    const animation = new WorkletAnimation(animator,
+      new KeyframeEffect(
+        document.getElementById(targetId),
+        keyframes,
+        {duration: 1000}
+      )
+    );
+    animation.play();
+    return animation;
+  };
+
+  start_animation('blank_animator','target1', [
+    { transform: 'translateY(100px)' },
+    { transform: 'translateY(200px)' }
+  ]);
+
+  start_animation('null_animator','target2', [
+    { transform: 'translateY(100px)' },
+    { transform: 'translateY(200px)' }
+  ]);
+
+  start_animation('drop_animator','target3', [
+    { transform: 'translateY(100px)' },
+    { transform: 'translateY(200px)' }
+  ]);
+
+  start_animation('drop_animator','target4', [
+    { backgroundColor: 'red' },
+    { backgroundColor: 'blue' }
+  ]);
+
+  // check that animation worklets are running to stop accidental pass
+  const control_anim = start_animation('add_animator','control', [
+    { backgroundColor: 'red', transform: 'translateY(100px)' },
+    { backgroundColor: 'blue', transform: 'translateY(200px)' }
+  ]);
+
+  waitForAnimationFrameWithCondition(() => control_anim.currentTime > 1000)
+    // long timeout due to laggy compositor thread on debug build.
+    .then(() => waitForAsyncAnimationFrames(120))
+    .then(takeScreenshot);
+});
+
+
+</script>
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes-ref.html
deleted file mode 100644
index 26bf33fdb40..00000000000
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes-ref.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<title>Reference for Worklet Animation sets keyframes</title>
-<style>
-#box {
-  width: 100px;
-  height: 100px;
-  transform: translateX(100px);
-  background-color: green;
-}
-</style>
-
-<div id="box"></div>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes.https.html
index 01740849460..d3d02898db2 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-keyframes.https.html
@@ -2,7 +2,7 @@
 <title>Worklet Animation sets keyframes</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="Can update the keyframes for an effect while the animation is running">
-<link rel="match" href="worklet-animation-set-keyframes-ref.html">
+<link rel="match" href="references/translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
@@ -21,13 +21,13 @@
 <script>
   registerConstantLocalTimeAnimator(500).then(()=>{
     const keyframes_before = [
-      { transform: 'translateY(0)' },
-      { transform: 'translateY(200px)' }
-    ];
-    const keyframes_after = [
       { transform: 'translateX(0)' },
       { transform: 'translateX(200px)' }
     ];
+    const keyframes_after = [
+      { transform: 'translateY(0)' },
+      { transform: 'translateY(200px)' }
+    ];
 
     const box = document.getElementById('box');
     const effect = new KeyframeEffect(box, keyframes_before, {duration: 1000});
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing-ref.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing-ref.html
deleted file mode 100644
index 8c354a8b06f..00000000000
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing-ref.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<title>Reference for Worklet Animation sets timing</title>
-<style>
-#box {
-  width: 100px;
-  height: 100px;
-  transform: translateX(50px);
-  background-color: green;
-}
-</style>
-
-<div id="box"></div>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing.https.html b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing.https.html
index ac3f05f4234..6c5cd51300c 100644
--- a/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing.https.html
+++ b/tests/wpt/web-platform-tests/animation-worklet/worklet-animation-set-timing.https.html
@@ -2,7 +2,7 @@
 <title>Worklet Animation sets timing</title>
 <link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
 <meta name="assert" content="Can update the timing for an effect while the animation is running">
-<link rel="match" href="worklet-animation-set-timing-ref.html">
+<link rel="match" href="references/translated-box-ref.html">
 
 <script src="/web-animations/testcommon.js"></script>
 <script src="/common/reftest-wait.js"></script>
@@ -21,8 +21,8 @@
 <script>
   registerConstantLocalTimeAnimator(500).then(()=>{
     const keyframes = [
-      { transform: 'translateX(0)' },
-      { transform: 'translateX(200px)' }
+      { transform: 'translateY(0)' },
+      { transform: 'translateY(400px)' }
     ];
     const options_before = {
       duration: 1000
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/service-worker-sandbox.https.html b/tests/wpt/web-platform-tests/content-security-policy/sandbox/service-worker-sandbox.https.html
new file mode 100644
index 00000000000..8b7d72e0ef9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/service-worker-sandbox.https.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<body>
+<script>
+let frame = null;
+let worker = null;
+const scope = 'support/empty.html';
+const script = 'support/sandboxed-service-worker.js';
+
+// Currently, sandbox directives for workers are not specified
+// https://github.com/w3c/webappsec-csp/issues/279
+// and thus this test asserts that the origin of ServiceWorker is not sandboxed.
+
+// Global setup: this must be the first promise_test.
+promise_test(async (t) => {
+  const registration =
+      await service_worker_unregister_and_register(t, script, scope);
+  worker = registration.installing;
+  await wait_for_state(t, worker, 'activated');
+  frame = await with_iframe(scope);
+
+  // Global cleanup: the final promise_test.
+  promise_test(() => {
+    if (frame)
+      frame.remove();
+     return registration.unregister();
+  }, 'global cleanup');
+}, 'global setup');
+
+promise_test(async (t) => {
+  const r = await frame.contentWindow.fetch('/get-origin', {mode: 'cors'});
+  const j = await r.json();
+  assert_equals(j.origin, location.origin, 'Origin should not be sandboxed');
+}, 'Origin of service worker');
+
+promise_test(async (t) => {
+  const r = await frame.contentWindow.fetch('/get-origin',
+                                            {mode: 'same-origin'});
+  const j = await r.json();
+  assert_equals(j.origin, location.origin, 'Origin should not be opaque');
+}, 'Response generated by service worker can be fetched as same-origin');
+
+// Because the origin of service worker should be `location.origin`,
+// fetches from service worker to `location.origin` should be successful.
+for (const mode of ['same-origin', 'cors']) {
+  for (const hasACAOrigin of [true, false]) {
+    promise_test(async (t) => {
+      const final_url = new URL('/fetch/api/resources/', location);
+      final_url.pathname += hasACAOrigin ? 'cors-top.txt' : 'top.txt';
+      final_url.searchParams.set('hash', Math.random());
+
+      const url = new URL('/fetch', location);
+      url.searchParams.set('url', final_url);
+      url.searchParams.set('hash', Math.random());
+      const r = await frame.contentWindow.fetch(url, {mode});
+      const text = await r.text();
+      assert_equals(text, 'top');
+    }, 'Origin used in fetch on service worker (mode: ' +
+       mode +
+       (hasACAOrigin ? ', with ACAOrigin' : '') +
+       ')');
+  }
+}
+</script>
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/shared-worker-sandbox.html b/tests/wpt/web-platform-tests/content-security-policy/sandbox/shared-worker-sandbox.html
new file mode 100644
index 00000000000..86b39b9ad47
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/shared-worker-sandbox.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+// Currently, sandbox directives for workers are not specified
+// https://github.com/w3c/webappsec-csp/issues/279
+// and thus this test asserts that the origin of SharedWorker is not sandboxed.
+async_test(t => {
+  const worker = new SharedWorker("support/sandboxed-shared-worker.js?" + Math.random());
+  worker.onerror = t.unreached_func("SharedWorker construction failed");
+  worker.port.onmessage = t.step_func_done(e => {
+    assert_equals(e.data, location.origin, "Origin should not be sandboxed");
+  });
+}, "sandbox directive for SharedWorker");
+</script>
+</body>
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/empty.html b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/empty.html
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js
new file mode 100644
index 00000000000..d4971266f5c
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js
@@ -0,0 +1,14 @@
+self.addEventListener('fetch', function(event) {
+    const url = new URL(event.request.url);
+    if (url.pathname.indexOf('get-origin') != -1) {
+      event.respondWith(new Promise(function(resolve) {
+        resolve(new Response(JSON.stringify({
+            origin: self.origin
+          })));
+        }));
+    }
+    else if (url.pathname.indexOf('fetch') != -1) {
+      event.respondWith(fetch(url.searchParams.get('url'),
+                              {mode: event.request.mode}));
+    }
+  });
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js.headers b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js.headers
new file mode 100644
index 00000000000..1efcf8c226f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-service-worker.js.headers
@@ -0,0 +1 @@
+Content-Security-Policy: sandbox allow-scripts
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js
new file mode 100644
index 00000000000..eb85eb41b4b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js
@@ -0,0 +1,3 @@
+self.onconnect = e => {
+  e.ports[0].postMessage(self.origin);
+};
diff --git a/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js.headers b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js.headers
new file mode 100644
index 00000000000..1efcf8c226f
--- /dev/null
+++ b/tests/wpt/web-platform-tests/content-security-policy/sandbox/support/sandboxed-shared-worker.js.headers
@@ -0,0 +1 @@
+Content-Security-Policy: sandbox allow-scripts
diff --git a/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/flex-and-intrinsic-sizes-002.html b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/flex-and-intrinsic-sizes-002.html
index 1f93d0e3d0e..6b2df4e5720 100644
--- a/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/flex-and-intrinsic-sizes-002.html
+++ b/tests/wpt/web-platform-tests/css/css-grid/layout-algorithm/flex-and-intrinsic-sizes-002.html
@@ -3,7 +3,7 @@
 <link rel="author" title="Tab Atkins-Bittner" href="https://xanthir.com/contact/">
 <link rel="help" href="https://drafts.csswg.org/css-grid/#min-size-auto">
 <link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
-<meta name="assert" content="An item spanning >1 track, at least one of which is flexible, must have a zero automatic minimum size (and thus, not grow to accommodate its children)."
+<meta name="assert" content="An item spanning >1 track, at least one of which is flexible, must have a zero automatic minimum size (and thus, not grow to accommodate its children).">
 
 <style>
 .grid { display: grid; grid-template-columns: repeat(12, 1fr); height: 100px; width: 100px; }
@@ -13,6 +13,7 @@
 .big-child { width: 500px; height: 100px; }
 </style>
 
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
 
 <div class="grid">
   <div class="under"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/abspos-008.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/abspos-008.tentative.html
index c81e9fcf405..429b14ac35f 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/abspos-008.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/abspos-008.tentative.html
@@ -11,15 +11,15 @@
 <div style="position: relative; height: 100px; position: relative;">
   <div style="position: absolute; aspect-ratio: 1/1; max-height: 100%; background: green; color: green;">
     <!-- max-size 200px, min-size: 20px -->
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
   </div>
 </div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-020.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-020.tentative.html
index 3cb076252b0..b07e91faf98 100644
--- a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-020.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-020.tentative.html
@@ -11,15 +11,15 @@
 <div style="height: 100px;">
   <div style="aspect-ratio: 1/1; max-height: 100%; background: green;">
     <!-- max-size 200px, min-size: 20px -->
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
-    <div style="width: 20px; height: 10px; vertical-align: bottom;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
   </div>
 </div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-021.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-021.tentative.html
new file mode 100644
index 00000000000..0e9c1b6b0a2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-021.tentative.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A max-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- Due to the transferred max-height, this should not be 200px wide -->
+<div style="max-height: 100px; aspect-ratio: 1/1; width: max-content; background: green;">
+  <div style="width: 200px"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-022.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-022.tentative.html
new file mode 100644
index 00000000000..1ee8021a3bb
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-022.tentative.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A max-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- min-content width is 300px, clamped by max-width to 100px. The transferred min-width
+     would be 200px but should not override the explicit max-width, so the resulting div
+     should be 100px wide. This should then size the green div to a width of 100px. -->
+<div style="min-height: 200px; max-width: 100px; aspect-ratio: 1/1;">
+  <div style="width: 300px;"></div>
+  <div style="height: 100px; background: green;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-023.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-023.tentative.html
new file mode 100644
index 00000000000..e38cfe0cb26
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-023.tentative.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A max-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- min-content width is 50px, clamped by min-width to 100px. The transferred max-width
+     would be 40px but should not override the explicit min-width, so the resulting div
+     should be 100px wide. This should then size the green div to a width of 100px. -->
+<div style="max-height: 40px; min-width: 100px; aspect-ratio: 1/1;">
+  <div style="width: 50px;"></div>
+  <div style="height: 100px; background: green;"></div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-024.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-024.tentative.html
new file mode 100644
index 00000000000..d6f6716b99d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-024.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A min-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div id="target" style="height: 0px; width: min-content; background: green;">
+  <div style="min-height: 100%; aspect-ratio: 1/1;">
+    <div style="width: 50px">
+  </div>
+</div>
+
+<script>
+document.body.offsetTop;
+document.getElementById("target").style.height = "100px";
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-025.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-025.tentative.html
new file mode 100644
index 00000000000..6ce67367237
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-025.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A min-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- Even with a specified but indefinite height, we want to apply the
+     transferred min/max height to the inline size. -->
+<div style="aspect-ratio: 1/1; height: 100%; min-height: 100px; background: green; float: left;"></div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-026.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-026.tentative.html
new file mode 100644
index 00000000000..0e0ce5efe3a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-026.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A max-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="height: 100px;">
+  <div style="aspect-ratio: 1/1; max-height: 100%; padding-bottom: 20px; background: green; box-sizing: border-box;">
+    <!-- max-size 200px, min-size: 20px -->
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-027.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-027.tentative.html
new file mode 100644
index 00000000000..532f558b39d
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-027.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A max-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="height: 100px;">
+  <div style="aspect-ratio: 100/80; max-height: 80px; padding-bottom: 20px; background: green; box-sizing: content-box;">
+    <!-- max-size 200px, min-size: 20px -->
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+    <div style="width: 20px; height: 10px; vertical-align: bottom; display: inline-block;"></div>
+  </div>
+</div>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-028.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-028.tentative.html
new file mode 100644
index 00000000000..ec49bd4d7af
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/block-aspect-ratio-028.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: abspos div inline size with max-height</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5257">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+<meta name="assert" content="A min-height constraint should be transferred through the aspect-ratio to apply to the inline size">
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div id="target" style="height: 50px; width: min-content; background: green;">
+  <div style="height: 100%;">
+    <div style="min-height: 100%; aspect-ratio: 1/1;"></div>
+  </div>
+</div>
+
+<script>
+document.body.offsetTop;
+document.getElementById("target").style.height = "100px";
+</script>
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-013.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-013.tentative.html
new file mode 100644
index 00000000000..bcbf653d68a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-013.tentative.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: img</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- Replaced elements should always use content-box sizing for the purpose of
+     aspect ratio. -->
+<img src="support/20x50-green.png" style="aspect-ratio: 20/50; background: green; padding-right: 80px; padding-bottom: 50px; box-sizing: border-box;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-014.tentative.html b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-014.tentative.html
new file mode 100644
index 00000000000..4c1ad16ce86
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-sizing/aspect-ratio/replaced-element-014.tentative.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>CSS aspect-ratio: img</title>
+<link rel="author" title="Google LLC" href="https://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht" />
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<!-- Replaced elements should always use content-box sizing for the purpose of
+     aspect ratio. -->
+<img src="support/20x50-green.png" style="aspect-ratio: 20/50; background: green; padding-right: 80px; padding-bottom: 50px; box-sizing: border-box; max-height: 100px;">
+
diff --git a/tests/wpt/web-platform-tests/css/css-transitions/event-dispatch.tentative.html b/tests/wpt/web-platform-tests/css/css-transitions/event-dispatch.tentative.html
index 9e4946cf336..5ed01cdd258 100644
--- a/tests/wpt/web-platform-tests/css/css-transitions/event-dispatch.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-transitions/event-dispatch.tentative.html
@@ -414,4 +414,22 @@ promise_test(async t => {
   await waitForAnimationFrames(2);
 }, 'Cancel the transition after clearing the target effect');
 
+promise_test(async t => {
+  const { transition, watcher, div } = setupTransition(t, 'margin-left 100s');
+
+  // Seek to After phase.
+  transition.finish();
+  const events = await watcher.wait_for(
+    ['transitionrun', 'transitionstart', 'transitionend'],
+    {
+      record: 'all',
+    }
+  );
+
+  transition.cancel();
+
+  // Then wait a couple of frames and check that no event was dispatched
+  await waitForAnimationFrames(2);
+}, 'Cancel the transition after it finishes');
+
 </script>
diff --git a/tests/wpt/web-platform-tests/docs/writing-tests/testharness-api.md b/tests/wpt/web-platform-tests/docs/writing-tests/testharness-api.md
index 72263dbd4ea..38997a2dcc9 100644
--- a/tests/wpt/web-platform-tests/docs/writing-tests/testharness-api.md
+++ b/tests/wpt/web-platform-tests/docs/writing-tests/testharness-api.md
@@ -515,7 +515,7 @@ properties of the test harness (enumerated in the following section).
 Both setup functions recognize the following properties:
 
 `explicit_done` - Wait for an explicit call to done() before declaring all
-tests complete (see below; implicitly true for single page tests)
+tests complete (see below; always true for single page tests)
 
 `output_document` - The document to which results should be logged. By default
 this is the current document but could be an ancestor document in some cases
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop-ro.https.html
index 1472afa63c1..24943b03f39 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop-ro.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop-ro.https.html
@@ -18,21 +18,21 @@ const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
 
 promise_test(async t => {
   const report_token = token();
-  const executor_token = token();
-  const callback_token = token();
+  const openee_token = token();
+  const opener_token = token(); // The current test window.
 
   const reportTo = reportToHeaders(report_token);
   const openee_url = cross_origin + executor_path +
     reportTo.header + reportTo.coopReportOnlySameOriginHeader + coep_header +
-    `&uuid=${executor_token}`;
+    `&uuid=${openee_token}`;
   const openee = window.open(openee_url);
-  t.add_cleanup(() => send(executor_token, "window.close()"))
+  t.add_cleanup(() => send(openee_token, "window.close()"))
 
   // 1. Make sure the new document to be loaded.
-  send(executor_token, `
-    send("${callback_token}", "Ready");
+  send(openee_token, `
+    send("${opener_token}", "Ready");
   `);
-  let reply = await receive(callback_token);
+  let reply = await receive(opener_token);
   assert_equals(reply, "Ready");
 
   // 2. Try to access the openee. A report is sent, because of COOP-RO+COEP.
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop.https.html
index 64dd07b5701..07ba21a0c74 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/openee-accessed_openee-coop.https.html
@@ -18,21 +18,21 @@ const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
 
 promise_test(async t => {
   const report_token = token();
-  const executor_token = token();
-  const callback_token = token();
+  const openee_token = token();
+  const opener_token = token(); // The current test window.
 
   const reportTo = reportToHeaders(report_token);
   const openee_url = cross_origin + executor_path +
     reportTo.header + reportTo.coopSameOriginHeader + coep_header +
-    `&uuid=${executor_token}`;
+    `&uuid=${openee_token}`;
   const openee = window.open(openee_url);
-  t.add_cleanup(() => send(executor_token, "window.close()"))
+  t.add_cleanup(() => send(openee_token, "window.close()"))
 
   // 1. Make sure the new document to be loaded.
-  send(executor_token, `
-    send("${callback_token}", "Ready");
+  send(openee_token, `
+    send("${opener_token}", "Ready");
   `);
-  let reply = await receive(callback_token);
+  let reply = await receive(opener_token);
   assert_equals(reply, "Ready");
 
   // 2. Try to access the openee. This shouldn't work because of COOP+COEP.
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop-ro.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop-ro.https.html
index 3e5180af626..b8f9f22e7cb 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop-ro.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop-ro.https.html
@@ -18,18 +18,17 @@ const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
 
 promise_test(async t => {
   const report_token = token();
-  const executor_token = token();
-  const callback_token = token();
+  const openee_token = token();
 
   const reportTo = reportToHeaders(report_token);
   const openee_url = cross_origin + executor_path +
     reportTo.header + reportTo.coopReportOnlySameOriginHeader + coep_header +
-    `&uuid=${executor_token}`;
+    `&uuid=${openee_token}`;
   const openee = window.open(openee_url);
-  t.add_cleanup(() => send(executor_token, "window.close()"))
+  t.add_cleanup(() => send(openee_token, "window.close()"))
 
   // 1. Try to access the opener. A report is sent, because of COOP-RO+COEP.
-  send(executor_token, `
+  send(openee_token, `
     tryAccess(opener);
   `);
 
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop.https.html
index e39dcfcec6a..ffce48de496 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/opener-accessed_openee-coop.https.html
@@ -18,18 +18,17 @@ const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
 
 promise_test(async t => {
   const report_token = token();
-  const executor_token = token();
-  const callback_token = token();
+  const openee_token = token();
 
   const reportTo = reportToHeaders(report_token);
   const openee_url = cross_origin + executor_path +
     reportTo.header + reportTo.coopSameOriginHeader + coep_header +
-    `&uuid=${executor_token}`;
+    `&uuid=${openee_token}`;
   const openee = window.open(openee_url);
-  t.add_cleanup(() => send(executor_token, "window.close()"));
+  t.add_cleanup(() => send(openee_token, "window.close()"));
 
   // 1. Try to access the opener. A report is sent, because of COOP+COEP.
-  send(executor_token, `
+  send(openee_token, `
     tryAccess(opener);
   `);
 
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html
new file mode 100644
index 00000000000..d2309e5fbd1
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html
@@ -0,0 +1,66 @@
+<title> Check reports are sent for the indexed getter</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="../resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+const coep_header = '|header(Cross-Origin-Embedder-Policy,require-corp)';
+
+let origin = [
+  ["cross-origin" , get_host_info().HTTPS_REMOTE_ORIGIN ] ,
+  ["same-site"    , get_host_info().HTTPS_ORIGIN        ] ,
+];
+
+let testCase = [
+//[operation  , expectReport ] ,
+  [w => w[0]  , true         ], // Existing iframe.
+  [w => w[1]  , false        ], // Out of bounds (positive).
+  [w => w[-1] , false        ], // Out of bounds (negative).
+];
+
+origin.forEach(([origin_name, origin]) => {
+  testCase.forEach(([op, expectReport]) =>  {
+    promise_test(async t => {
+      const opener_token = token();
+      const openee_token = token();
+
+      const openee_url = origin+ executor_path + `&uuid=${openee_token}`;
+      const openee = window.open(openee_url);
+      t.add_cleanup(() => send(openee_token, "window.close()"))
+
+      // 1. Create an iframe in the openee.
+      send(openee_token, `
+        let iframe = document.createElement("iframe");
+        document.body.appendChild(iframe);
+
+        send("${opener_token}", "openee loaded");
+      `);
+      let reply = await receive(opener_token);
+      assert_equals(reply, "openee loaded");
+
+      // 2. Try to access the openee.
+      let observer = new ReportingObserver(()=>{});
+      observer.observe();
+      try {op(openee)} catch(e) {}
+      let reports = observer.takeRecords();
+      observer.disconnect();
+
+      // 3. Check the received reports.
+      if (expectReport) {
+        assert_equals(reports.length, 1);
+        assert_equals(reports[0].type, "coop-access-violation");
+        assert_equals(reports[0].body.property, "indexed");
+      } else {
+        assert_equals(reports.length, 0);
+      }
+
+    }, `${origin_name} > ${op}`);
+});
+});
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html.headers b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html.headers
new file mode 100644
index 00000000000..64f4d5fedff
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-indexed-getter.https.html.headers
@@ -0,0 +1 @@
+Cross-Origin-Opener-Policy-Report-Only: same-origin; report-to="none"
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html
new file mode 100644
index 00000000000..2ab9093fcb5
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html
@@ -0,0 +1,72 @@
+<title> Check reports are sent for the indexed getter</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src="/common/utils.js"></script>
+<script src="../resources/dispatcher.js"></script>
+<script>
+
+const directory = "/html/cross-origin-opener-policy/reporting";
+const executor_path = directory + "/resources/executor.html?pipe=";
+let crossOrigin = ["cross-origin" , get_host_info().HTTPS_REMOTE_ORIGIN ];
+let sameOrigin =  ["same-site"    , get_host_info().HTTPS_ORIGIN        ];
+
+let testCase = [
+//[ operation                , origin      , expectReport ],
+  [ w => w["iframeName"]     , sameOrigin  , true           ],
+  [ w => w["iframeName"]     , crossOrigin , true           ],
+  [ w => w["divID"]          , sameOrigin  , true           ],
+  [ w => w["divID"]          , crossOrigin , false          ],
+  [ w => w["existingGlobal"] , sameOrigin  , false          ],
+  [ w => w["existingGlobal"] , crossOrigin , false          ],
+  [ w => w["missingGlobal"]  , sameOrigin  , false          ],
+  [ w => w["missingGlobal"]  , crossOrigin , false          ],
+];
+
+testCase.forEach(([op, [origin_name, origin], expectReport]) => {
+  promise_test(async t => {
+    const opener_token = token();
+    const openee_token = token();
+
+    const openee_url = origin + executor_path + `&uuid=${openee_token}`;
+    const openee = window.open(openee_url);
+    t.add_cleanup(() => send(openee_token, "window.close()"))
+
+    // 1. Make sure the new document to be loaded. Populate the document.
+    send(openee_token, `
+      let iframe = document.createElement("iframe");
+      iframe.name = "iframeName";
+      document.body.appendChild(iframe);
+
+      let div = document.createElement("div");
+      div.id = "divID";
+      document.body.appendChild(div);
+
+      window.existingGlobal = "test";
+
+      send("${opener_token}", "Ready");
+    `);
+    let reply = await receive(opener_token);
+    assert_equals(reply, "Ready");
+
+    // 2. Try to access the openee.
+    let observer = new ReportingObserver(()=>{});
+    observer.observe();
+    try {op(openee)} catch(e) {}
+    let reports = observer.takeRecords();
+    observer.disconnect();
+
+    // 3. Check the received reports.
+    if (expectReport) {
+      assert_equals(reports.length, 1);
+      assert_equals(reports[0].type, "coop-access-violation");
+      assert_equals(reports[0].body.property, "named");
+    } else {
+      assert_equals(reports.length, 0);
+    }
+
+  }, `${origin_name} > ${op}`);
+});
+
+</script>
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html.headers b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html.headers
new file mode 100644
index 00000000000..64f4d5fedff
--- /dev/null
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property-named-getter.https.html.headers
@@ -0,0 +1 @@
+Cross-Origin-Opener-Policy-Report-Only: same-origin; report-to="none"
diff --git a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property.https.html b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property.https.html
index 625fc941177..6a22cb2076c 100644
--- a/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property.https.html
+++ b/tests/wpt/web-platform-tests/html/cross-origin-opener-policy/reporting/access-reporting/property.https.html
@@ -22,11 +22,9 @@ let property= [
   ["closed"      , w => w.closed             ] ,
   ["focus"       , w => w.focus()            ] ,
   ["frames"      , w => w.frames             ] ,
-  ["indexed"     , w => w[0]                 ] ,
   ["length"      , w => w.length             ] ,
   ["location"    , w => w.location           ] ,
   ["location"    , w => w.location = "#"     ] ,
-  ["named"       , w => w["test"]            ] ,
   ["opener"      , w => w.opener             ] ,
   ["opener"      , w => w.opener = ""        ] ,
   ["postMessage" , w => w.postMessage("")    ] ,
@@ -40,19 +38,19 @@ origin.forEach(([origin_name, origin]) => {
   property.forEach(([property, op]) =>  {
     promise_test(async t => {
       const report_token = token();
-      const executor_token = token();
-      const callback_token = token();
+      const openee_token = token();
+      const opener_token = token(); // The current test window.
 
       const reportTo = reportToHeaders(report_token);
-      const openee_url = origin+ executor_path +
-        reportTo.header + reportTo.coopReportOnlySameOriginHeader + coep_header +
-        `&uuid=${executor_token}`;
+      const openee_url = origin + executor_path + reportTo.header +
+        reportTo.coopReportOnlySameOriginHeader + coep_header +
+        `&uuid=${openee_token}`;
       const openee = window.open(openee_url);
-      t.add_cleanup(() => send(executor_token, "window.close()"))
+      t.add_cleanup(() => send(openee_token, "window.close()"))
 
       // 1. Make sure the new document to be loaded.
-      send(executor_token, `send("${callback_token}", "Ready");`);
-      let reply = await receive(callback_token);
+      send(openee_token, `send("${opener_token}", "Ready");`);
+      let reply = await receive(opener_token);
       assert_equals(reply, "Ready");
 
       // 2. Try to access the openee. This shouldn't work because of COOP+COEP.
diff --git a/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl b/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
index d3783858578..36107ddeea2 100644
--- a/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
+++ b/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
@@ -20,7 +20,8 @@ interface PerformanceEntry {
 };
 
 callback PerformanceObserverCallback = void (PerformanceObserverEntryList entries,
-                                             PerformanceObserver observer);
+                                             PerformanceObserver observer,
+                                             optional boolean hasDroppedEntry = false);
 [Exposed=(Window,Worker)]
 interface PerformanceObserver {
   constructor(PerformanceObserverCallback callback);
diff --git a/tests/wpt/web-platform-tests/layout-instability/input-timestamp.html b/tests/wpt/web-platform-tests/layout-instability/input-timestamp.html
new file mode 100644
index 00000000000..02dde1ad5d7
--- /dev/null
+++ b/tests/wpt/web-platform-tests/layout-instability/input-timestamp.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Layout Instability: observe timestamp after user input</title>
+
+<body>
+  <style>
+    #myDiv {
+      position: relative;
+      width: 300px;
+      height: 100px;
+    }
+
+    /* Disable the button's focus ring, which otherwise expands its visual rect by
+ * 1px on all sides, triggering a layout shift event.
+ */
+    #button {
+      outline: none;
+    }
+  </style>
+  <div id='myDiv'></div>
+  <button id='button'>Generate a 'click' event</button>
+  <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/util.js></script>
+  <script src=/event-timing/resources/event-timing-test-utils.js></script>
+  <script>
+    let timeAfterClick;
+
+    promise_test(async t => {
+      assert_implements(window.LayoutShift, 'Layout Instability is not supported.');
+      // Wait for the initial render to complete.
+      await waitForAnimationFrames(2);
+
+      const startTime = performance.now();
+      return new Promise(resolve => {
+        const observer = new PerformanceObserver(
+          t.step_func(entryList => {
+            const endTime = performance.now();
+            assert_equals(entryList.getEntries().length, 1);
+            const entry = entryList.getEntries()[0];
+            assert_equals(entry.entryType, "layout-shift");
+            assert_equals(entry.name, "");
+            assert_greater_than_equal(entry.startTime, startTime);
+            assert_less_than_equal(entry.startTime, endTime);
+            assert_equals(entry.duration, 0.0);
+            // The layout shift value should be:
+            // 300 * (100 + 60) * (60 / maxDimension) / viewport size.
+            assert_equals(entry.value, computeExpectedScore(300 * (100 + 60), 60));
+            // We should see that there was a click input entry.
+            assert_equals(entry.hadRecentInput, false);
+            assert_greater_than_equal(timeAfterClick, entry.lastInputTime);
+            resolve();
+          })
+        );
+        observer.observe({ entryTypes: ['layout-shift'] });
+        // User input event
+        clickAndBlockMain('button').then(() => {
+          // 500ms delay
+          step_timeout(function() {
+            timeAfterClick = performance.now();
+            // Modify the position of the div.
+            document.getElementById('myDiv').style = "top: 60px";
+          }, 500);
+        });
+      });
+    }, 'Layout shift right after user input is observable via PerformanceObserver.');
+  </script>
+
+</body>
diff --git a/tests/wpt/web-platform-tests/payment-request/secure-payment-confirmation.https.html b/tests/wpt/web-platform-tests/payment-request/secure-payment-confirmation.https.html
new file mode 100644
index 00000000000..860876e2e9b
--- /dev/null
+++ b/tests/wpt/web-platform-tests/payment-request/secure-payment-confirmation.https.html
@@ -0,0 +1,177 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test for 'secure-payment-confirmation' payment method</title>
+<link rel="help" href="https://github.com/rsolomakhin/secure-payment-confirmation">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+const details = {total:
+    {label: 'Total', amount: {value: '0.01', currency: 'USD'}}};
+
+test(() => {
+  new PaymentRequest([{
+    supportedMethods: 'secure-payment-confirmation',
+    data: {
+       // All valid parameters.
+       action: 'authenticate',
+       instrumentId: 'x',
+       networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+       timeout: 60000,
+       fallbackUrl: 'https://fallback.example/url'
+    },
+  }], details);
+}, 'Valid payment method data does not throw exceptions.');
+
+test(() => {
+  new PaymentRequest([{
+    supportedMethods: 'secure-payment-confirmation',
+    data: {
+       // Omitted action field.
+       instrumentId: 'x',
+       networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+       timeout: 60000,
+       fallbackUrl: 'https://fallback.example/url'
+    },
+  }], details);
+}, 'The action field is optional.');
+
+test(() => {
+  new PaymentRequest([{
+    supportedMethods: 'secure-payment-confirmation',
+    data: {
+       action: 'authenticate',
+       instrumentId: 'x',
+       networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+       // Omitted timeout field.
+       fallbackUrl: 'https://fallback.example/url'
+    },
+  }], details);
+}, 'The timeout field is optional.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        // Invalid action parameter.
+        action: 'authorize',
+        instrumentId: 'x',
+        networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Invalid action parameter throws an exception.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        // Omitted instrumentId field.
+        networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'The instrumentId field is required.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        instrumentId: 'x',
+        // Omitted instrumentId field.
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'The networkData field is required.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        instrumentId: 'x',
+        networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+        timeout: 60000,
+        // Omitted fallbackUrl field.
+      },
+    }], details);
+  });
+}, 'The fallbackUrl field is required.');
+
+test(() => {
+  assert_throws_js(RangeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        // Empty instrumentId field.
+        instrumentId: '',
+        networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Empty instrumentId field throws exception.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        instrumentId: 'x',
+        // Null networkData field.
+        networkData: null,
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Null networkData field throws exception.');
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        instrumentId: 'x',
+        // Empty networkData field.
+        networkData: [],
+        timeout: 60000,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Empty networkData field throws exception.');
+
+test(() => {
+  assert_throws_js(RangeError, () => {
+    new PaymentRequest([{
+      supportedMethods: 'secure-payment-confirmation',
+      data: {
+        action: 'authenticate',
+        instrumentId: 'x',
+        networkData: Uint8Array.from('x', c => c.charCodeAt(0)),
+        // Timeout longer than 1 hour.
+        timeout: 1000 * 60 * 60 + 1,
+        fallbackUrl: 'https://fallback.example/url'
+      },
+    }], details);
+  });
+}, 'Timeout longer than 1 hour throws exception.');
+</script>
diff --git a/tests/wpt/web-platform-tests/pointerevents/compat/pointerevent_compat-mouse-events-when-removing-nodes.html b/tests/wpt/web-platform-tests/pointerevents/compat/pointerevent_compat-mouse-events-when-removing-nodes.html
index 88d03b7965e..6d13b0de354 100644
--- a/tests/wpt/web-platform-tests/pointerevents/compat/pointerevent_compat-mouse-events-when-removing-nodes.html
+++ b/tests/wpt/web-platform-tests/pointerevents/compat/pointerevent_compat-mouse-events-when-removing-nodes.html
@@ -5,12 +5,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/resources/testdriver-actions.js"></script>
 <script type="text/javascript" src="../pointerevent_support.js"></script>
-
+<!-- There are significant differences in how browsers fire pointer events and
+compat mouse events when elements are removed from the dom.
+There is a discussion about the order of pointer events and mouse compat events
+for this scenario in the pointer event working group (See link below)-->
+<link rel="help" href="https://github.com/w3c/pointerevents/issues/285">
 <style>
 div.box {
   margin: 5px;
   padding: 20px;
   float: left;
+  background-color:green;
 }
 #grey {
   width: 50px;
@@ -22,12 +27,14 @@ div.box {
 
 <div id="grey" class="box" style="background-color:grey">
 </div>
+<button id="done">Done</button>
 
 <div id="console"></div>
 
 <script>
 
 var receivedEvents = [];
+var done_clicked = false;
 
 var eventList = ["mousedown", "mouseup", "mousemove",
                  "pointerdown", "pointerup", "pointermove"];
@@ -62,6 +69,9 @@ function createGreenBoxAndAddListeners() {
   });
 }
 
+var done_button = document.getElementById("done");
+done_button.addEventListener("click",()=>done_clicked=true);
+
 function performActions() {
   var rect = document.getElementById("green").getBoundingClientRect();
   var x1 = Math.ceil(rect.left + 5);
@@ -73,13 +83,13 @@ function performActions() {
               .pointerDown()
               .pointerUp()
               .send()
-              .then( () => resolveWhen( () => receivedEvents.length == 6 ) );
+              .then(()=> test_driver.click(done_button));
 }
 
 function testScenario(targetEvent, expectedEvents, description) {
   promise_test(async () => {
-    removeNodeEvent = targetEvent;
     receivedEvents = [];
+    removeNodeEvent = targetEvent;
     createGreenBoxAndAddListeners();
 
     await performActions();
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/com.apple.SafariTechnologyPreview.plist b/tests/wpt/web-platform-tests/tools/ci/azure/com.apple.SafariTechnologyPreview.plist
new file mode 100644
index 00000000000..122080972c9
--- /dev/null
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/com.apple.SafariTechnologyPreview.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>AllowRemoteAutomation</key>
+	<true/>
+</dict>
+</plist>
diff --git a/tests/wpt/web-platform-tests/tools/ci/azure/install_safari.yml b/tests/wpt/web-platform-tests/tools/ci/azure/install_safari.yml
index d0660d152bb..6c1b562d411 100644
--- a/tests/wpt/web-platform-tests/tools/ci/azure/install_safari.yml
+++ b/tests/wpt/web-platform-tests/tools/ci/azure/install_safari.yml
@@ -9,7 +9,10 @@ steps:
 - ${{ if eq(parameters.channel, 'preview') }}:
   - script: |
       HOMEBREW_NO_AUTO_UPDATE=1 brew cask install tools/ci/azure/safari-technology-preview.rb
-      sudo "/Applications/Safari Technology Preview.app/Contents/MacOS/safaridriver" --enable
+      # Workaround for `sudo safardriver --enable` not working on Catalina:
+      # https://github.com/web-platform-tests/wpt/issues/21751
+      mkdir -p ~/Library/WebDriver/
+      cp tools/ci/azure/com.apple.SafariTechnologyPreview.plist ~/Library/WebDriver/
       defaults write com.apple.SafariTechnologyPreview WebKitJavaScriptCanOpenWindowsAutomatically 1
       defaults write com.apple.SafariTechnologyPreview ExperimentalServerTimingEnabled 1
     displayName: 'Install Safari Technology Preview'
diff --git a/tests/wpt/web-platform-tests/url/resources/urltestdata.json b/tests/wpt/web-platform-tests/url/resources/urltestdata.json
index ded7107ff75..bc79426526c 100644
--- a/tests/wpt/web-platform-tests/url/resources/urltestdata.json
+++ b/tests/wpt/web-platform-tests/url/resources/urltestdata.json
@@ -6986,5 +6986,51 @@
     "pathname": "/",
     "search": "",
     "hash": "#link"
+  },
+  "UTF-8 percent-encode of C0 control percent-encode set and supersets",
+  {
+    "input": "non-special:cannot-be-a-base-url-\u0000\u0001\u001F\u001E\u007E\u007F\u0080",
+    "base": "about:blank",
+    "hash": "",
+    "host": "",
+    "hostname": "",
+    "href": "non-special:cannot-be-a-base-url-%00%01%1F%1E~%7F%C2%80",
+    "origin": "null",
+    "password": "",
+    "pathname": "cannot-be-a-base-url-%00%01%1F%1E~%7F%C2%80",
+    "port": "",
+    "protocol": "non-special:",
+    "search": "",
+    "username": ""
+  },
+  {
+    "input": "https://www.example.com/path{\u007Fpath.html?query'\u007F=query#fragment<\u007Ffragment",
+    "base": "about:blank",
+    "hash": "#fragment%3C%7Ffragment",
+    "host": "www.example.com",
+    "hostname": "www.example.com",
+    "href": "https://www.example.com/path%7B%7Fpath.html?query%27%7F=query#fragment%3C%7Ffragment",
+    "origin": "https://www.example.com",
+    "password": "",
+    "pathname": "/path%7B%7Fpath.html",
+    "port": "",
+    "protocol": "https:",
+    "search": "?query%27%7F=query",
+    "username": ""
+  },
+  {
+    "input": "https://user:pass[\u007F@foo/bar",
+    "base": "http://example.org",
+    "hash": "",
+    "host": "foo",
+    "hostname": "foo",
+    "href": "https://user:pass%5B%7F@foo/bar",
+    "origin": "https://foo",
+    "password": "pass%5B%7F",
+    "pathname": "/bar",
+    "port": "",
+    "protocol": "https:",
+    "search": "",
+    "username": "user"
   }
 ]