diff --git a/tests/wpt/metadata/MANIFEST.json b/tests/wpt/metadata/MANIFEST.json
index ca408f31ea8..5057f8ca497 100644
--- a/tests/wpt/metadata/MANIFEST.json
+++ b/tests/wpt/metadata/MANIFEST.json
@@ -263029,6 +263029,9 @@
    "fetch/origin/resources/redirect-and-stash.py": [
     []
    ],
+   "fetch/origin/resources/referrer-policy.py": [
+    []
+   ],
    "fetch/range/resources/basic.html": [
     []
    ],
@@ -271033,10 +271036,13 @@
    "kv-storage/META.yml": [
     []
    ],
-   "kv-storage/helpers/class-assert.js": [
+   "kv-storage/helpers/equality-asserters.js": [
     []
    ],
-   "kv-storage/helpers/equality-asserters.js": [
+   "kv-storage/helpers/expose-as-global.html": [
+    []
+   ],
+   "kv-storage/helpers/iter-assert.js": [
     []
    ],
    "kv-storage/helpers/kvs-tests.js": [
@@ -340422,24 +340428,9 @@
      {}
     ]
    ],
-   "fetch/origin/no-cors.any.js": [
+   "fetch/origin/assorted.window.js": [
     [
-     "fetch/origin/no-cors.any.html",
-     {
-      "script_metadata": [
-       [
-        "script",
-        "/common/utils.js"
-       ],
-       [
-        "script",
-        "/common/get-host-info.sub.js"
-       ]
-      ]
-     }
-    ],
-    [
-     "fetch/origin/no-cors.any.worker.html",
+     "fetch/origin/assorted.window.html",
      {
       "script_metadata": [
        [
@@ -356832,12 +356823,6 @@
      {}
     ]
    ],
-   "kv-storage/api-surface.https.html": [
-    [
-     "kv-storage/api-surface.https.html",
-     {}
-    ]
-   ],
    "kv-storage/backingstore.https.html": [
     [
      "kv-storage/backingstore.https.html",
@@ -356847,12 +356832,22 @@
    "kv-storage/cause-errors-via-idb.https.html": [
     [
      "kv-storage/cause-errors-via-idb.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "kv-storage/entries.https.html": [
     [
      "kv-storage/entries.https.html",
+     {
+      "timeout": "long"
+     }
+    ]
+   ],
+   "kv-storage/interface.https.html": [
+    [
+     "kv-storage/interface.https.html",
      {}
     ]
    ],
@@ -356867,13 +356862,17 @@
    "kv-storage/keys-values-entries.https.html": [
     [
      "kv-storage/keys-values-entries.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "kv-storage/keys.https.html": [
     [
      "kv-storage/keys.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "kv-storage/non-secure-context-dynamic-import.html": [
@@ -356897,19 +356896,25 @@
    "kv-storage/storage-smoke-test.https.html": [
     [
      "kv-storage/storage-smoke-test.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "kv-storage/undefined-value.https.html": [
     [
      "kv-storage/undefined-value.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "kv-storage/values.https.html": [
     [
      "kv-storage/values.https.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "largest-contentful-paint/observe-image.html": [
@@ -541246,7 +541251,7 @@
    "reftest"
   ],
   "css/css-fonts/math-script-level-and-math-style/math-script-level-004.tentative.html": [
-   "084e181b63d96d5df38ccbc9a639a067f556ec39",
+   "6fe35c2719e4e460e0c88f261ba3f5185a5f062d",
    "testharness"
   ],
   "css/css-fonts/math-script-level-and-math-style/math-script-level-005.tentative-ref.html": [
@@ -580062,7 +580067,7 @@
    "testharness"
   ],
   "css/css-values/calc-parenthesis-stack.html": [
-   "1d9033d7eecd14066ee9e4f9c52bf1a39e6ddd1b",
+   "d8dbafb3f720253df4225f5279a1a7a9af2caa35",
    "reftest"
   ],
   "css/css-values/calc-positive-fraction-001.html": [
@@ -597786,7 +597791,7 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/images3/reftest.list": [
-   "1a21c76db1c380794b05300512c5042927c640f5",
+   "b6a70d8bc633bafb8d88ce5fe35f451a027dcea7",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/images3/support/colors-16x8-noSize.svg": [
@@ -598562,11 +598567,11 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002-ref.html": [
-   "d1ba587e983270d16495ef8eff65a89672015883",
+   "41533ee76b013a53e07a5effd2e02ff01da9ac65",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002.html": [
-   "e16b7731ebc5fed35144f3bbe883ba1c224b90d2",
+   "4616d5014675224793aa9de4f67a79472462c800",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-003-ref.html": [
@@ -599006,11 +599011,11 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056-ref.html": [
-   "f4f21058a66693efb729653ba2d0599d40f19138",
+   "519d33864d811ca71c15ab4d1b7572371f48e2a9",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056.html": [
-   "57323a42444ee4229d4eb3a1c6e58c5c7b63ce5d",
+   "d51cb50447ee5681459569fbd4fd573fbd2f2ccf",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-content-box-001-ref.html": [
@@ -599198,11 +599203,11 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052-ref.html": [
-   "f4f21058a66693efb729653ba2d0599d40f19138",
+   "519d33864d811ca71c15ab4d1b7572371f48e2a9",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052.html": [
-   "ee95f59dd5cdd6d16237928a272c7540a80ec6eb",
+   "33f7a8fe34fdcd671c96e307d7ee753003f1a2b5",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-inset-016-ref.html": [
@@ -599462,11 +599467,11 @@
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032-ref.html": [
-   "f1fcdf40d719beac17a1cc85619daca2c0abb0ff",
+   "b3f7028eec4112f1b818e95d474b725193e79b84",
    "support"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032.html": [
-   "7649a98cdc6b7855babc5da87abf55e0d4825ac3",
+   "6e17492e4496fbd33ec42486f737ba204c343fcf",
    "reftest"
   ],
   "css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/support/Ahem.ttf": [
@@ -609981,12 +609986,16 @@
    "c8c1076df5cffe60845f67ad275c6e36f024d989",
    "testharness"
   ],
-  "fetch/origin/no-cors.any.js": [
-   "c9d1d3b3af3750ec43549a3d96a0912e2cf6b399",
+  "fetch/origin/assorted.window.js": [
+   "9e832724a70ddf406511555e791c9eac5902397c",
    "testharness"
   ],
   "fetch/origin/resources/redirect-and-stash.py": [
-   "1b1b46ba177ad3af56ef83e90b0974dd81cd3eae",
+   "aa9eb35db2bddb59acb1c7ebcbb971ab38d344b9",
+   "support"
+  ],
+  "fetch/origin/resources/referrer-policy.py": [
+   "22b71e33b54160c451f1bbfc8a157600eeb7059f",
    "support"
   ],
   "fetch/range/general.any.js": [
@@ -610154,7 +610163,7 @@
    "support"
   ],
   "fetch/sec-metadata/resources/helper.js": [
-   "1968cfc0dd8ed94047a9c436458ea1c568c15bf1",
+   "9425246881b1bdc7f4cace59e4e211d298316197",
    "support"
   ],
   "fetch/sec-metadata/resources/post-to-owner.py": [
@@ -610186,7 +610195,7 @@
    "testharness"
   ],
   "fetch/sec-metadata/serviceworker.tentative.https.sub.html": [
-   "c86198df6a2e31dc3c665fe5fe3f452bb47eeb26",
+   "43d7ab30525a845f34f0bd4e60aac59c39b62e7e",
    "testharness"
   ],
   "fetch/sec-metadata/sharedworker.tentative.https.sub.html": [
@@ -632402,7 +632411,7 @@
    "support"
   ],
   "interfaces/performance-timeline.idl": [
-   "8ded59d8a269f83037a8845417c1275dd91ec538",
+   "56c0ec4bc2bd7dbfd5bca24f9c548d8c37595259",
    "support"
   ],
   "interfaces/permissions.idl": [
@@ -632486,7 +632495,7 @@
    "support"
   ],
   "interfaces/service-workers.idl": [
-   "89229e377f7eca23e2f9ce625f40fe1e7e87ea78",
+   "8e37060a180328d937d26623aaa030ad434eacc6",
    "support"
   ],
   "interfaces/shape-detection-api.idl": [
@@ -632526,7 +632535,7 @@
    "support"
   ],
   "interfaces/wai-aria.idl": [
-   "cd039adfc5bc39bae26b1024bb7cbee22b0e9612",
+   "c4fbf11409cf142d8295038d256f5a686d860a55",
    "support"
   ],
   "interfaces/wake-lock.idl": [
@@ -632578,7 +632587,7 @@
    "support"
   ],
   "interfaces/webmidi.idl": [
-   "aa2ac7f297b9b6e5d13a34d44ef772a471059f9d",
+   "58d6357f7365765c7e9142024caddba51c373927",
    "support"
   ],
   "interfaces/webrtc-dscp.idl": [
@@ -632586,7 +632595,7 @@
    "support"
   ],
   "interfaces/webrtc-stats.idl": [
-   "981317f6be42d79f8113a1c032f325f673007d27",
+   "f29e00d195e898cb6c2dfce9a82bc81fd168787a",
    "support"
   ],
   "interfaces/webrtc.idl": [
@@ -632602,7 +632611,7 @@
    "support"
   ],
   "interfaces/webxr.idl": [
-   "4af1c96a1847445c7559dabba20cb8a3a1de5c60",
+   "c78683ef6bf6822b0320fe4c16bc9630a63884de",
    "support"
   ],
   "interfaces/worklets.idl": [
@@ -632993,44 +633002,48 @@
    "bf4a1e6e8b44bc78cf7a624a12b254cbac2f25a5",
    "support"
   ],
-  "kv-storage/api-surface.https.html": [
-   "90e705862d599f2920ebdf5fa07cc3e4ba1f6d46",
-   "testharness"
-  ],
   "kv-storage/backingstore.https.html": [
    "44e634d85bbc34621450c4029a63c5e9114075b3",
    "testharness"
   ],
   "kv-storage/cause-errors-via-idb.https.html": [
-   "d77e56621e037b71fa6ae9bfb3e80a0ab85677fc",
+   "1a7294d093f482b1c2c30840684c8b6a74bc5a0c",
    "testharness"
   ],
   "kv-storage/entries.https.html": [
-   "0d1ab849a709bc8361bca88de34aa91c1ee3e23b",
+   "07815920d5eec7235ceaa596558627991866715b",
    "testharness"
   ],
-  "kv-storage/helpers/class-assert.js": [
-   "89f0889c56d3a990a812be9208377090607335a2",
-   "support"
-  ],
   "kv-storage/helpers/equality-asserters.js": [
    "448ab31348cee50be8820185d8bdfb8f626eb9dc",
    "support"
   ],
+  "kv-storage/helpers/expose-as-global.html": [
+   "4ff3c6cf9c22fdfedfe7987d46eeba37bd666266",
+   "support"
+  ],
+  "kv-storage/helpers/iter-assert.js": [
+   "e1ac73c8e9abd0d6c55812523abcc590a638da9f",
+   "support"
+  ],
   "kv-storage/helpers/kvs-tests.js": [
    "0cf4c2fd3d5fcaa392e8cbbcf64101155bcbe441",
    "support"
   ],
+  "kv-storage/interface.https.html": [
+   "ab1930b25c355e2da15fc4d2a2fea8fa2042ffcc",
+   "testharness"
+  ],
   "kv-storage/key-types.https.html": [
    "edf3248fa609252df9a862f6ebc2b7b3755f0f09",
    "testharness"
   ],
   "kv-storage/keys-values-entries.https.html": [
-   "b26323809bb3d33551ee9630bcf841fa0246262b",
+   "27ad3e4f1868d1d774b6ef2e505423aea9a0da37",
    "testharness"
   ],
   "kv-storage/keys.https.html": [
-   "a6be29725bf3274f6b5bb92b370962507a29b692",
+   "3535d2fb93993af74d752c80626d5f10c0d24a60",
    "testharness"
   ],
   "kv-storage/non-secure-context-dynamic-import.html": [
@@ -633046,15 +633059,15 @@
    "testharness"
   ],
   "kv-storage/storage-smoke-test.https.html": [
-   "da48dc7cf13cb31fd5f5a3b4b7fa086100197bd9",
+   "31dac972d984f4301f54f2948eb4e2c7d6481c25",
    "testharness"
   ],
   "kv-storage/undefined-value.https.html": [
-   "4cb483a3d982ab150fb28c6aee3a1398c273e82c",
+   "d87641e95b8f55a0f7c3d724f620f17943537c96",
    "testharness"
   ],
   "kv-storage/values.https.html": [
-   "64756bf195fc3319d9dd21abad4c5d86fa266cfe",
+   "bbdc7aee84437ebd0e029556dd1d1fcb9670dc5d",
    "testharness"
   ],
   "largest-contentful-paint/observe-image.html": [
@@ -658854,7 +658867,7 @@
    "testharness"
   ],
   "service-workers/service-worker/interfaces-sw.https.html": [
-   "50c76d306dc2f43eac0f4d827e9b72464b63220c",
+   "73ffb28b36ea38b7230a7042feb444fde0bcf2e9",
    "testharness"
   ],
   "service-workers/service-worker/interfaces-window.https.html": [
diff --git a/tests/wpt/metadata/css/css-transitions/properties-value-001.html.ini b/tests/wpt/metadata/css/css-transitions/properties-value-001.html.ini
index 130c0181e43..1bf87ac2d4a 100644
--- a/tests/wpt/metadata/css/css-transitions/properties-value-001.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/properties-value-001.html.ini
@@ -1079,3 +1079,12 @@
   [text-indent percentage(%) / values]
     expected: FAIL
 
+  [margin-top length(pt) / values]
+    expected: FAIL
+
+  [padding-bottom length(ex) / values]
+    expected: FAIL
+
+  [padding-bottom length(cm) / values]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini b/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
index 8850ec200da..1c8f983cd37 100644
--- a/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
+++ b/tests/wpt/metadata/css/css-transitions/transitions-animatable-properties-01.html.ini
@@ -74,3 +74,6 @@
   [opacity end]
     expected: FAIL
 
+  [outline-width end]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/fetch/content-type/response.window.js.ini b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
index d586c7bff89..f5210864539 100644
--- a/tests/wpt/metadata/fetch/content-type/response.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/response.window.js.ini
@@ -312,21 +312,18 @@
   [<iframe>: separate response Content-Type: */* text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html */*;charset=gbk]
-    expected: FAIL
-
-  [<iframe>: separate response Content-Type: text/html;x=" text/plain]
-    expected: FAIL
-
   [<iframe>: combined response Content-Type: */* text/html]
     expected: FAIL
 
   [<iframe>: combined response Content-Type: text/html */*]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;" \\" text/plain]
+  [<iframe>: combined response Content-Type: text/html;charset=gbk text/plain text/html]
     expected: FAIL
 
-  [<iframe>: combined response Content-Type: text/html;x=" text/plain]
+  [<iframe>: separate response Content-Type: text/plain */*]
+    expected: FAIL
+
+  [<iframe>: separate response Content-Type: text/plain */*;charset=gbk]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/fetch/content-type/script.window.js.ini b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
index 5c001592859..2d5faa72ac7 100644
--- a/tests/wpt/metadata/fetch/content-type/script.window.js.ini
+++ b/tests/wpt/metadata/fetch/content-type/script.window.js.ini
@@ -53,9 +53,6 @@
   [combined text/javascript ]
     expected: FAIL
 
-  [separate text/javascript x/x]
-    expected: FAIL
-
   [separate text/javascript;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 536384f36e1..87c807a49ff 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 +11,3 @@
   [X-Content-Type-Options%3A%20nosniff%0C]
     expected: FAIL
 
-  [X-Content-Type-Options%3A%20%2Cnosniff]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/fetch/origin/assorted.window.js.ini b/tests/wpt/metadata/fetch/origin/assorted.window.js.ini
new file mode 100644
index 00000000000..185f7f93787
--- /dev/null
+++ b/tests/wpt/metadata/fetch/origin/assorted.window.js.ini
@@ -0,0 +1,98 @@
+[assorted.window.html]
+  expected: TIMEOUT
+  [Origin header and POST same-origin fetch cors mode with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch cors mode with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch cors mode with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin navigation with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch no-cors mode with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and 308 redirect]
+    expected: FAIL
+
+  [Origin header and POST same-origin fetch no-cors mode with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch no-cors mode with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin navigation with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch no-cors mode with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch no-cors mode with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin navigation with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch no-cors mode with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch cors mode with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch no-cors mode with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin navigation with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and POST navigation]
+    expected: TIMEOUT
+
+  [Origin header and POST cross-origin navigation with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin navigation with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch cors mode with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch no-cors mode with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch cors mode with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin navigation with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch no-cors mode with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch no-cors mode with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin navigation with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch cors mode with Referrer-Policy unsafe-url]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin navigation with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch cors mode with Referrer-Policy same-origin]
+    expected: NOTRUN
+
+  [Origin header and POST same-origin fetch cors mode with Referrer-Policy origin-when-cross-origin]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin fetch cors mode with Referrer-Policy no-referrer]
+    expected: NOTRUN
+
+  [Origin header and POST cross-origin navigation with Referrer-Policy no-referrer-when-downgrade]
+    expected: NOTRUN
+
diff --git a/tests/wpt/metadata/fetch/sec-metadata/serviceworker.tentative.https.sub.html.ini b/tests/wpt/metadata/fetch/sec-metadata/serviceworker.tentative.https.sub.html.ini
new file mode 100644
index 00000000000..2f149b44241
--- /dev/null
+++ b/tests/wpt/metadata/fetch/sec-metadata/serviceworker.tentative.https.sub.html.ini
@@ -0,0 +1,4 @@
+[serviceworker.tentative.https.sub.html]
+  [sec-metadata for service worker scripts]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini b/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
deleted file mode 100644
index 51f8272a6de..00000000000
--- a/tests/wpt/metadata/html/browsers/history/the-history-interface/traverse_the_history_3.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[traverse_the_history_3.html]
-  [Multiple history traversals, last would be aborted]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
index bf50d59df41..e02f179ec25 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-innerwidth-innerheight.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-innerwidth-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `innerwidth`, `innerheight`]
     expected: FAIL
 
+  [features "innerheight=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
index e150c9d848f..23eefb8eaf9 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-screenx-screeny.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-screenx-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for legacy `screenx`, `screeny`]
     expected: FAIL
 
+  [features "screenx=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screeny=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "screenx=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
index ad8840fbb68..940516ddd33 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-top-left.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-top-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `top`, `left`]
     expected: FAIL
 
+  [features "top=-204" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "top=-204.5" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "top=-0" should NOT set "top=204"]
+    expected: TIMEOUT
+
+  [features "left=-204.5" should NOT set "left=204"]
+    expected: TIMEOUT
+
+  [features "left=-0" should NOT set "left=204"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
index d1ed9088b2b..9027336b453 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-negative-width-height.html.ini
@@ -1,5 +1,24 @@
 [open-features-negative-width-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: negative values for `width`, `height`]
     expected: FAIL
 
+  [features "height=-404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404e1" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=-404.5" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "width=-404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404e1" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=-404.5" should NOT set "width=404"]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
index a70e9dbad4d..4e44584b123 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-height.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `height`]
     expected: FAIL
 
   [features "height=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "height=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "height=/404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,width=401,: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "height" should be treated same as "height=0"]
+    expected: TIMEOUT
+
+  [features "height=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "height=L404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
index 779531b4a98..fcaeae5336d 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerheight.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerheight`]
     expected: FAIL
 
   [features "innerheight=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerheight=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerheight=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "innerheight=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
index 7a1b258d52e..42327fedd27 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-innerwidth.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `innerwidth`]
     expected: FAIL
 
   [features "innerwidth=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "innerwidth=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "innerwidth=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "innerwidth=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
index caba4124f0b..a8e4fe06618 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-left.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `left`]
     expected: FAIL
 
   [features "left=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "left=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "left=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=/104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "left=_104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
index 9ace8a4cbdb..64a08faf0e6 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screenx.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screenx`]
     expected: FAIL
 
   [features "screenx=105.5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105  " should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105*3" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105e-1" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105^4" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105LLl" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105/5" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screenx=105.32" should set "left=105"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screenx=_104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=L104" should NOT set "left=104"]
+    expected: TIMEOUT
+
+  [features "screenx=/104" should NOT set "left=104"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
index a82bd0f981a..4f22ef4ef29 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
@@ -1,32 +1,42 @@
 [open-features-non-integer-screeny.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for legacy feature `screeny`]
     expected: FAIL
 
   [features "screeny=405^4" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e-1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405LLl" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405e1" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405  " should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405/5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405*3" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.32" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "screeny=405.5" should set "height=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [features "screeny=_404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=L404" should NOT set "height=404"]
+    expected: TIMEOUT
+
+  [features "screeny=/404" should NOT set "height=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
index 28f93ee71b5..9d841e61bc0 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
@@ -1,32 +1,48 @@
 [open-features-non-integer-width.html]
   type: testharness
+  expected: TIMEOUT
   [HTML: window.open `features`: non-integer values for feature `width`]
     expected: FAIL
 
   [features "width=405^4" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405  " should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405.32" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405LLl" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405*3" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405e-1" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
 
   [features "width=405/5" should set "width=405"]
-    expected: FAIL
+    expected: TIMEOUT
+
+  [top=0,left=0: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=_404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [top=0,left=0,height=401,: absence of feature "width" should be treated same as "width=0"]
+    expected: TIMEOUT
+
+  [features "width=/404" should NOT set "width=404"]
+    expected: TIMEOUT
+
+  [features "width=L404" should NOT set "width=404"]
+    expected: TIMEOUT
 
diff --git a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
index 496bad988c6..034d9baebfa 100644
--- a/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
+++ b/tests/wpt/metadata/html/webappapis/scripting/processing-model-2/unhandled-promise-rejections/promise-rejection-events.html.ini
@@ -1,4 +1,5 @@
 [promise-rejection-events.html]
+  expected: TIMEOUT
   [delayed handling: delaying handling rejected promise created from createImageBitmap will cause both events to fire]
     expected: FAIL
 
@@ -8,3 +9,6 @@
   [no unhandledrejection/rejectionhandled: rejection handler attached synchronously to a promise created from createImageBitmap]
     expected: FAIL
 
+  [rejectionhandled is dispatched from a queued task, and not immediately]
+    expected: TIMEOUT
+
diff --git a/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini b/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
index a223c9b3c2e..1db2179e85f 100644
--- a/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
+++ b/tests/wpt/metadata/resource-timing/resource_TAO_origin.htm.ini
@@ -17,3 +17,6 @@
   [The iframe should have one resource timing entry.]
     expected: FAIL
 
+  [responseEnd should not be 0 in timing-allow cross-origin request.]
+    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/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
index 20f9a144d5b..9cd1756edc9 100644
--- a/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
+++ b/tests/wpt/metadata/webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html.ini
@@ -32,3 +32,9 @@
   [X SNR (21.50436285446287 dB) is not greater than or equal to 65.737. Got 21.50436285446287.]
     expected: FAIL
 
+  [X SNR (21.440582478634532 dB) is not greater than or equal to 65.737. Got 21.440582478634532.]
+    expected: FAIL
+
+  [X Stitched sine-wave buffers at sample rate 43800 does not equal [0,0.06264832615852356,0.12505052983760834,0.18696144223213196,0.24813786149024963,0.308339387178421,0.36732959747314453,0.4248766601085663,0.480754554271698,0.5347436666488647,0.5866320133209229,0.6362156271934509,0.6832997798919678,0.7276994585990906,0.7692402601242065,0.8077589869499207...\] with an element-wise tolerance of {"absoluteThreshold":0.0038986,"relativeThreshold":0}.\n\tIndex\tActual\t\t\tExpected\t\tAbsError\t\tRelError\t\tTest threshold\n\t[30\]\t9.4836157560348511e-1\t9.5236867666244507e-1\t4.0071010589599609e-3\t4.2075103446311962e-3\t3.8985999999999999e-3\n\t[31\]\t9.2646563053131104e-1\t9.3139332532882690e-1\t4.9276947975158691e-3\t5.2906700783754857e-3\t3.8985999999999999e-3\n\t[32\]\t9.0087991952896118e-1\t9.0675884485244751e-1\t5.8789253234863281e-3\t6.4834496590358351e-3\t3.8985999999999999e-3\n\t[33\]\t8.7170630693435669e-1\t8.7856203317642212e-1\t6.8557262420654297e-3\t7.8033490899654511e-3\t3.8985999999999999e-3\n\t[34\]\t8.3906102180480957e-1\t8.4691369533538818e-1\t7.8526735305786133e-3\t9.2721059699818163e-3\t3.8985999999999999e-3\n\t...and 31037 more errors.\n\tMax AbsError of 9.8276454228804466e-1 at index of 39267.\n\t[39267\]\t1.8523094169609067e-10\t-9.8276454210281372e-1\t9.8276454228804466e-1\t1.0000000001884795e+0\t3.8985999999999999e-3\n\tMax RelError of 3.3137802965303198e+0 at index of 1253.\n\t[1253\]\t-4.3022233992815018e-2\t-9.9732093513011932e-3\t3.3049024641513824e-2\t3.3137802965303198e+0\t3.8985999999999999e-3\n]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
deleted file mode 100644
index 80f9a4f15b8..00000000000
--- a/tests/wpt/metadata/workers/constructors/Worker/Worker-constructor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Worker-constructor.html]
-  expected: ERROR
diff --git a/tests/wpt/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-004.tentative.html b/tests/wpt/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-004.tentative.html
index 084e181b63d..6fe35c2719e 100644
--- a/tests/wpt/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-004.tentative.html
+++ b/tests/wpt/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-004.tentative.html
@@ -45,7 +45,7 @@
       .level5 { math-script-level: 5; }
     </style>
     <script>
-      const big = 2000;
+      const big = 3000;
       const small = 150;
       setup({ explicit_done: true });
       window.addEventListener("load", function() {
@@ -94,11 +94,12 @@
           }, "scriptPercentScaleDown=80, scriptScriptPercentScaleDown=40");
 
           test(function() {
+              var scriptPercentScaleDown = .71;
               CheckFontSizes("scale0-40-scaledown", {
                   "-3": big,
                   "-1": big * .71 * .71,
                   "0": big * .71 * .71 * .71,
-                  "1": big * .71 * .71 * .71 * .71,
+                  "1": big * .71 * .71 * .71 * scriptPercentScaleDown,
                   "2": big * .71 * .71 * .71 * .4,
                   "3": big * .71 * .71 * .71 * .4 * .71,
                   "5": big * .71 * .71 * .71 * .4 * .71 * .71 * .71
@@ -107,7 +108,7 @@
                   "5": small,
                   "3": small / (.71 * .71),
                   "2": small / (.71 * .71 * .71),
-                  "1": small / (.71 * .71 * .71 * (.4 / .71)),
+                  "1": small / (.71 * .71 * .71 * (.4 / scriptPercentScaleDown)),
                   "0": small  / (.71 * .71 * .71 * .4),
                   "-1": small / (.71 * .71 * .71 * .4 * .71),
                   "-3": small / (.71 * .71 * .71 * .4 * .71 * .71 * .71)
@@ -115,23 +116,24 @@
           }, "scriptPercentScaleDown=0, scriptScriptPercentScaleDown=40");
 
           test(function() {
+              var scriptScriptPercentScaleDown = 0.5041;
               CheckFontSizes("scale80-0-scaledown", {
                   "-3": big,
                   "-1": big * .71 * .71,
                   "0": big * .71 * .71 * .71,
                   "1": big * .71 * .71 * .71 * .8,
-                  "2": big * .71 * .71 * .71 * .71 * .71,
-                  "3": big * .71 * .71 * .71 * .71 * .71 * .71,
-                  "5": big * .71 * .71 * .71 * .71 * .71 * .71 * .71 * .71
+                  "2": big * .71 * .71 * .71 * scriptScriptPercentScaleDown,
+                  "3": big * .71 * .71 * .71 * scriptScriptPercentScaleDown * .71,
+                  "5": big * .71 * .71 * .71 * scriptScriptPercentScaleDown * .71 * .71 * .71
               });
               CheckFontSizes("scale80-0-scaleup", {
                   "5": small,
                   "3": small / (.71 * .71),
                   "2": small / (.71 * .71 * .71),
-                  "1": small / (.71 * .71 * .71 * (.71 / .8)),
-                  "0": small  / (.71 * .71 * .71 * .71),
-                  "-1": small / (.71 * .71 * .71 * .71 * .71),
-                  "-3": small / (.71 * .71 * .71 * .71 * .71 * .71 * .71)
+                  "1": small / (.71 * .71 * .71 * (scriptScriptPercentScaleDown / .8)),
+                  "0": small  / (.71 * .71 * .71 * scriptScriptPercentScaleDown),
+                  "-1": small / (.71 * .71 * .71 * scriptScriptPercentScaleDown * .71),
+                  "-3": small / (.71 * .71 * .71 * scriptScriptPercentScaleDown * .71 * .71 * .71)
               });
           }, "scriptPercentScaleDown=80, scriptScriptPercentScaleDown=0");
 
diff --git a/tests/wpt/web-platform-tests/css/css-values/calc-parenthesis-stack.html b/tests/wpt/web-platform-tests/css/css-values/calc-parenthesis-stack.html
index 1d9033d7eec..d8dbafb3f72 100644
--- a/tests/wpt/web-platform-tests/css/css-values/calc-parenthesis-stack.html
+++ b/tests/wpt/web-platform-tests/css/css-values/calc-parenthesis-stack.html
@@ -4,12 +4,18 @@
 	<meta charset="utf-8">
 	<title>
 		CSS Values and Units Test:
-		Calc() inside calc()
+		32 nested pairs of parentheses inside calc()
 	</title>
 	<meta name="assert" content="
-		The calc() function notation is allowed inside a calc() notation.
+		This test checks the support for the minimum required number of 32 nested pairs of parentheses inside a calc() function.
 	" />
 
+  <!--
+  More info:
+  [css-values] Limit nested pairs of parentheses in calc to 32
+  https://github.com/w3c/csswg-drafts/issues/3462
+  -->
+
 	<link
 		rel="author"
 		title="François REMY"
@@ -29,7 +35,7 @@
 
 			html { background: red; overflow: hidden; }
 			#outer { position: absolute; top: 0px; left: 0px; background: green; width: 100%; }
-			#outer { height: calc((((((((((((((((((((((((100%)))))))))))))))))))))))); }
+			#outer { height: calc((((((((((((((((((((((((((((((((100%)))))))))))))))))))))))))))))))); }
 
 	</style>
 
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/images3/reftest.list b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/images3/reftest.list
index 1a21c76db1c..b6a70d8bc63 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/images3/reftest.list
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/images3/reftest.list
@@ -75,6 +75,7 @@
 == object-fit-fill-svg-006i.html object-fit-fill-svg-006-ref.html
 == object-fit-fill-svg-006o.html object-fit-fill-svg-006-ref.html
 == object-fit-fill-svg-006p.html object-fit-fill-svg-006-ref.html
+# All the random-if(geckoview) failures in this file are tracked by bug 1558515
 == object-fit-contain-svg-001e.html object-fit-contain-svg-001-ref.html
 == object-fit-contain-svg-001i.html object-fit-contain-svg-001-ref.html
 == object-fit-contain-svg-001o.html object-fit-contain-svg-001-ref.html
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002-ref.html
index d1ba587e983..41533ee76b0 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002-ref.html
@@ -5,6 +5,11 @@
   <title>CSS Reference: Inlinize block-level boxes inside ruby</title>
   <link rel="author" title="Xidorn Quan" href="mailto:quanxunzhen@gmail.com">
   <style>
+    body {
+      /* Use a sans-serif font to avoid fuzzy pixels where e.g. the
+         letter "a" bottom-right serif might overlap the table border: */
+      font: 16px sans-serif;
+    }
     .block, table, .flex {
       background-color: yellow;
       width: 100px; height: 30px;
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002.html
index e16b7731ebc..4616d501467 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/ruby/ruby-inlinize-blocks-002.html
@@ -7,6 +7,11 @@
   <link rel="help" href="http://www.w3.org/TR/css-ruby-1/#anon-gen-inlinize">
   <link rel="match" href="ruby-inlinize-blocks-002-ref.html">
   <style>
+    body {
+      /* Use a sans-serif font to avoid fuzzy pixels where e.g. the
+         letter "a" bottom-right serif might overlap the table border: */
+      font: 16px sans-serif;
+    }
     .block, table, .flex {
       background-color: yellow;
       width: 100px; height: 30px;
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056-ref.html
index f4f21058a66..519d33864d8 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056-ref.html
@@ -3,7 +3,6 @@
     <head>
         <title>CSS Reference File</title>
         <link rel="author" title="Rebecca Hauck" href="mailto:rhauck@adobe.com">
-    </head>
     <style>
        body {
            margin: 0;
@@ -28,6 +27,7 @@
            background-color: green;
        }
     </style>
+    </head>
     <body>
         <p>The test passes if there is a green square to the right of the blue line. There should be no red.</p>
         <div id="container">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056.html
index 57323a42444..d51cb50447e 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-circle-056.html
@@ -15,7 +15,6 @@
                                      top left with a shape-margin. Additionally, the
                                      shape-outside: circle element is offset from
                                      its containing block.">
-    </head>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style>
     @font-face {
@@ -66,6 +65,7 @@
         z-index: -1;
     }
     </style>
+    </head>
     <body>
     <p>The test passes if there is a green square to the right of the blue line. There should be no red.</p>
     <div id="container">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052-ref.html
index f4f21058a66..519d33864d8 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052-ref.html
@@ -3,7 +3,6 @@
     <head>
         <title>CSS Reference File</title>
         <link rel="author" title="Rebecca Hauck" href="mailto:rhauck@adobe.com">
-    </head>
     <style>
        body {
            margin: 0;
@@ -28,6 +27,7 @@
            background-color: green;
        }
     </style>
+    </head>
     <body>
         <p>The test passes if there is a green square to the right of the blue line. There should be no red.</p>
         <div id="container">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052.html
index ee95f59dd5c..33f7a8fe34f 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-ellipse-052.html
@@ -13,7 +13,6 @@
                                      a ellipse with a shape-margin in pixel units.
                                      Additionally, the shape-outside: ellipse element
                                      is offset from its containing block.">
-    </head>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style>
     @font-face {
@@ -64,6 +63,7 @@
         z-index: -1;
     }
     </style>
+    </head>
     <body>
     <p>The test passes if there is a green square to the right of the blue line. There should be no red.</p>
     <div id="container">
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032-ref.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032-ref.html
index f1fcdf40d71..b3f7028eec4 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032-ref.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032-ref.html
@@ -3,7 +3,6 @@
     <head>
         <title>CSS Reference File</title>
         <link rel="author" title="Rebecca Hauck" href="mailto:rhauck@adobe.com">
-    </head>
     <style>
        body {
             margin: 0;
@@ -17,8 +16,9 @@
           background-color: green;
       }
     </style>
+    </head>
     <body>
         <p>The test passes if there is green square and no red.</p>
         <div id="green-square"></div>
     </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032.html b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032.html
index 7649a98cdc6..6e17492e449 100644
--- a/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032.html
+++ b/tests/wpt/web-platform-tests/css/vendor-imports/mozilla/mozilla-central-reftests/shapes1/shape-outside-polygon-032.html
@@ -14,7 +14,6 @@
                                      an polygon from the margin box with a shape margin.
                                      Additionally, the shape-outside: polygon element is
                                      offset from its containing block.">
-    </head>
     <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
     <style>
         @font-face {
@@ -77,6 +76,7 @@
             height: 60px;
         }
     </style>
+    </head>
     <body>
     <p>The test passes if there is green square and no red.</p>
     <div id="red"></div>
diff --git a/tests/wpt/web-platform-tests/fetch/origin/assorted.window.js b/tests/wpt/web-platform-tests/fetch/origin/assorted.window.js
new file mode 100644
index 00000000000..9e832724a70
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/origin/assorted.window.js
@@ -0,0 +1,202 @@
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+
+const origins = get_host_info();
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  // Cross-origin -> same-origin will result in setting the tainted origin flag for the second
+  // request.
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
+
+  await fetch(url, { mode: "no-cors", method: "POST" });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], origins.HTTP_ORIGIN);
+  assert_equals(json[1], "null");
+}, "Origin header and 308 redirect");
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
+
+  await new Promise(resolve => {
+    const frame = document.createElement("iframe");
+    frame.src = url;
+    frame.onload = () => {
+      resolve();
+      frame.remove();
+    }
+    document.body.appendChild(frame);
+  });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], "no Origin header");
+  assert_equals(json[1], "no Origin header");
+}, "Origin header and GET navigation");
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
+
+  await new Promise(resolve => {
+    const frame = document.createElement("iframe");
+    self.addEventListener("message", e => {
+      if (e.data === "loaded") {
+        resolve();
+        frame.remove();
+      }
+    }, { once: true });
+    frame.onload = () => {
+      const doc = frame.contentDocument,
+            form = doc.body.appendChild(doc.createElement("form")),
+            submit = form.appendChild(doc.createElement("input"));
+      form.action = url;
+      form.method = "POST";
+      submit.type = "submit";
+      submit.click();
+    }
+    document.body.appendChild(frame);
+  });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], origins.HTTP_ORIGIN);
+  assert_equals(json[1], "null");
+}, "Origin header and POST navigation");
+
+function navigationReferrerPolicy(referrerPolicy, destination, expectedOrigin) {
+  return async function () {
+    const stash = token();
+    const referrerPolicyPath = "/fetch/origin/resources/referrer-policy.py";
+    const redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+    let postUrl =
+            (destination === "same-origin" ? origins.HTTP_ORIGIN
+                                           : origins.HTTP_REMOTE_ORIGIN) +
+            redirectPath + "?stash=" + stash;
+
+    await new Promise(resolve => {
+      const frame = document.createElement("iframe");
+      document.body.appendChild(frame);
+      frame.src = origins.HTTP_ORIGIN + referrerPolicyPath +
+                  "?referrerPolicy=" + referrerPolicy;
+      self.addEventListener("message", function listener(e) {
+        if (e.data === "loaded") {
+          resolve();
+          frame.remove();
+          self.removeEventListener("message", listener);
+        } else if (e.data === "action") {
+          const doc = frame.contentDocument,
+                form = doc.body.appendChild(doc.createElement("form")),
+                submit = form.appendChild(doc.createElement("input"));
+          form.action = postUrl;
+          form.method = "POST";
+          submit.type = "submit";
+          submit.click();
+        }
+      });
+    });
+
+    const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+    assert_equals(json[0], expectedOrigin);
+  };
+}
+
+function fetchReferrerPolicy(referrerPolicy, destination, fetchMode, expectedOrigin) {
+  return async function () {
+    const stash = token();
+    const referrerPolicyPath = "/fetch/origin/resources/referrer-policy.py";
+    const redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+    let fetchUrl =
+        (destination === "same-origin" ? origins.HTTP_ORIGIN
+                                       : origins.HTTP_REMOTE_ORIGIN) +
+        redirectPath + "?stash=" + stash;
+
+    await fetch(fetchUrl, { mode: fetchMode, method: "POST" , "referrerPolicy": referrerPolicy});
+
+    const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+    assert_equals(json[0], expectedOrigin);
+  };
+}
+
+function referrerPolicyTestString(referrerPolicy, destination) {
+  return "Origin header and POST " + destination + " with Referrer-Policy " +
+         referrerPolicy;
+}
+
+[
+  {
+    "policy": "no-referrer",
+    "expectedOriginForSameOrigin": "null",
+    "expectedOriginForCrossOrigin": "null"
+  },
+  {
+    "policy": "same-origin",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": "null"
+  },
+  {
+    "policy": "origin-when-cross-origin",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+  {
+    "policy": "no-referrer-when-downgrade",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+  {
+    "policy": "unsafe-url",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+].forEach(testObj => {
+  [
+    {
+      "name": "same-origin",
+      "expectedOrigin": testObj.expectedOriginForSameOrigin
+    },
+    {
+      "name": "cross-origin",
+      "expectedOrigin": testObj.expectedOriginForCrossOrigin
+    }
+  ].forEach(destination => {
+    // Test form POST navigation
+    promise_test(navigationReferrerPolicy(testObj.policy,
+                                          destination.name,
+                                          destination.expectedOrigin),
+                 referrerPolicyTestString(testObj.policy,
+                                          destination.name + " navigation"));
+    // Test fetch
+    promise_test(fetchReferrerPolicy(testObj.policy,
+                                     destination.name,
+                                     "no-cors",
+                                     destination.expectedOrigin),
+                 referrerPolicyTestString(testObj.policy,
+                                          destination.name + " fetch no-cors mode"));
+
+    // When we're dealing with CORS (mode is "cors"), we shouldn't take the
+    // Referrer-Policy into account
+    promise_test(fetchReferrerPolicy(testObj.policy,
+                                     destination.name,
+                                     "cors",
+                                     origins.HTTP_ORIGIN),
+                 referrerPolicyTestString(testObj.policy,
+                                          destination.name + " fetch cors mode"));
+  });
+});
diff --git a/tests/wpt/web-platform-tests/fetch/origin/no-cors.any.js b/tests/wpt/web-platform-tests/fetch/origin/no-cors.any.js
deleted file mode 100644
index c9d1d3b3af3..00000000000
--- a/tests/wpt/web-platform-tests/fetch/origin/no-cors.any.js
+++ /dev/null
@@ -1,20 +0,0 @@
-// META: script=/common/utils.js
-// META: script=/common/get-host-info.sub.js
-
-promise_test(async function() {
-  const stash = token(),
-        origins = get_host_info(),
-        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
-
-  // Cross-origin -> same-origin will result in setting the tainted origin flag for the second
-  // request.
-  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
-  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
-
-  await fetch(url, { mode: "no-cors", method: "POST" });
-
-  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
-
-  assert_equals(json[0], origins.HTTP_ORIGIN, "first origin should equal this origin");
-  assert_equals(json[1], "null", "second origin should be opaque and therefore null");
-}, "Origin header and 308 redirect");
diff --git a/tests/wpt/web-platform-tests/fetch/origin/resources/redirect-and-stash.py b/tests/wpt/web-platform-tests/fetch/origin/resources/redirect-and-stash.py
index 1b1b46ba177..aa9eb35db2b 100644
--- a/tests/wpt/web-platform-tests/fetch/origin/resources/redirect-and-stash.py
+++ b/tests/wpt/web-platform-tests/fetch/origin/resources/redirect-and-stash.py
@@ -9,7 +9,7 @@ def main(request, response):
     origin_list = request.server.stash.take(key)
 
     if "dump" in request.GET:
-        response.headers.set("content-Type", "application/json")
+        response.headers.set("Content-Type", "application/json")
         response.content = json.dumps(origin_list)
         return
 
@@ -25,5 +25,6 @@ def main(request, response):
         response.headers.set("Location", request.GET.first("location"))
         return
 
-    response.headers.set("content-Type", "text/plain")
-    response.content = "Fix https://github.com/whatwg/fetch/issues/737..."
+    response.headers.set("Content-Type", "text/html")
+    response.headers.set("Access-Control-Allow-Origin", "*")
+    response.content = "<meta charset=utf-8>\n<body><script>parent.postMessage('loaded','*')</script></body>"
diff --git a/tests/wpt/web-platform-tests/fetch/origin/resources/referrer-policy.py b/tests/wpt/web-platform-tests/fetch/origin/resources/referrer-policy.py
new file mode 100644
index 00000000000..22b71e33b54
--- /dev/null
+++ b/tests/wpt/web-platform-tests/fetch/origin/resources/referrer-policy.py
@@ -0,0 +1,7 @@
+def main(request, response):
+    if "referrerPolicy" in request.GET:
+        response.headers.set("Referrer-Policy",
+                             request.GET.first("referrerPolicy"))
+    response.status = 200
+    response.headers.set("Content-Type", "text/html")
+    response.content = "<meta charset=utf-8>\n<body><script>parent.postMessage('action','*')</script></body>"
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
index 1968cfc0dd8..9425246881b 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/resources/helper.js
@@ -1,11 +1,16 @@
-function assert_header_equals(value, expected) {
+function wrap_by_tag(tag, text) {
+  return tag ? `${tag}: ${text}`: text;
+}
+
+function assert_header_equals(value, expected, tag) {
   if (typeof(value) === "string"){
     assert_not_equals(value, "No header has been recorded");
     value = JSON.parse(value);
   }
-  assert_equals(value.dest, expected.dest, "dest");
-  assert_equals(value.mode, expected.mode, "mode");
-  assert_equals(value.site, expected.site, "site");
+
+  assert_equals(value.dest, expected.dest, wrap_by_tag(tag, "dest"));
+  assert_equals(value.mode, expected.mode, wrap_by_tag(tag, "mode"));
+  assert_equals(value.site, expected.site, wrap_by_tag(tag, "site"));
   if (expected.hasOwnProperty("user"))
-    assert_equals(value.user, expected.user, "user");
+    assert_equals(value.user, expected.user, wrap_by_tag(tag, "user"));
 }
diff --git a/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html b/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
index c86198df6a2..43d7ab30525 100644
--- a/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
+++ b/tests/wpt/web-platform-tests/fetch/sec-metadata/serviceworker.tentative.https.sub.html
@@ -12,44 +12,25 @@
 <script src=/common/utils.js></script>
 <body>
   <script>
-      let nonce = token();
-      let key = "serviceworker-same-origin" + nonce;
+    promise_test(async t => {
+      const nonce = token();
+      const key = "serviceworker-same-origin" + nonce;
 
-      if ('serviceWorker' in navigator) {
-        window.addEventListener('load', function() {
-          navigator.serviceWorker.register('https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=' + key).then(function(registration) {
-            test_same_origin();
+      // Register a service worker and check the request header.
+      const registration = await navigator.serviceWorker.register('https://{{host}}:{{ports[https][0]}}/fetch/sec-metadata/resources/record-header.py?file=' + key);
+      t.add_cleanup(() => registration.unregister());
+      await retrieve_and_assert_headers(key, 'Register service worker');
 
-            // uninstall the serviceworker after the test
-            navigator.serviceWorker.getRegistrations().then(function(registrations) {
-              for(let registration of registrations) {
-                registration.unregister()
-              }
-            })
-          }, function(err) {
-            // registration failed
-          });
-        });
-      }
-      else {
-        test(function () {
-              done();
-            }, "Browser does not support serviceworker");
-      }
+      // Trigger an update check and check the request header again.
+      await registration.update();
+      await retrieve_and_assert_headers(key, 'Update service worker');
+    }, 'sec-metadata for service worker scripts');
+
+    async function retrieve_and_assert_headers(key, tag) {
+      let expected = { "dest": "serviceworker", "site": "same-origin", "user": "", "mode": "same-origin" };
+      const response = await fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
+      const text = await response.text();
+      assert_header_equals(text, expected, tag);
+    }
   </script>
 </body>
-
-<script>
-  function test_same_origin(){
-    promise_test(t => {
-    return new Promise((resolve, reject) => {
-      let expected = {"dest":"serviceworker", "site":"same-origin", "user":"", "mode": "same-origin"};
-      fetch("/fetch/sec-metadata/resources/record-header.py?retrieve=true&file=" + key)
-        .then(response => response.text())
-        .then(text => assert_header_equals(text, expected))
-        .then(_ => resolve())
-        .catch(e => reject(e));
-      })
-    })
-  }
-</script>
diff --git a/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl b/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
index 8ded59d8a26..56c0ec4bc2b 100644
--- a/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
+++ b/tests/wpt/web-platform-tests/interfaces/performance-timeline.idl
@@ -32,7 +32,6 @@ interface PerformanceObserver {
 dictionary PerformanceObserverInit {
   sequence<DOMString> entryTypes;
   DOMString type;
-  boolean buffered;
 };
 
 [Exposed=(Window,Worker)]
diff --git a/tests/wpt/web-platform-tests/interfaces/service-workers.idl b/tests/wpt/web-platform-tests/interfaces/service-workers.idl
index 89229e377f7..8e37060a180 100644
--- a/tests/wpt/web-platform-tests/interfaces/service-workers.idl
+++ b/tests/wpt/web-platform-tests/interfaces/service-workers.idl
@@ -16,6 +16,7 @@ interface ServiceWorker : EventTarget {
 ServiceWorker includes AbstractWorker;
 
 enum ServiceWorkerState {
+  "parsed",
   "installing",
   "installed",
   "activating",
@@ -95,6 +96,7 @@ dictionary NavigationPreloadState {
 interface ServiceWorkerGlobalScope : WorkerGlobalScope {
   [SameObject] readonly attribute Clients clients;
   [SameObject] readonly attribute ServiceWorkerRegistration registration;
+  [SameObject] readonly attribute ServiceWorker serviceWorker;
 
   [NewObject] Promise<void> skipWaiting();
 
diff --git a/tests/wpt/web-platform-tests/interfaces/wai-aria.idl b/tests/wpt/web-platform-tests/interfaces/wai-aria.idl
index cd039adfc5b..c4fbf11409c 100644
--- a/tests/wpt/web-platform-tests/interfaces/wai-aria.idl
+++ b/tests/wpt/web-platform-tests/interfaces/wai-aria.idl
@@ -16,6 +16,7 @@ interface mixin AriaAttributes {
   attribute DOMString? ariaChecked;
   attribute DOMString? ariaColCount;
   attribute DOMString? ariaColIndex;
+  attribute DOMString? ariaColIndexText;
   attribute DOMString? ariaColSpan;
   attribute FrozenArray<Element>? ariaControlsElements;
   attribute DOMString? ariaCurrent;
@@ -47,6 +48,7 @@ interface mixin AriaAttributes {
   attribute DOMString? ariaRoleDescription;
   attribute DOMString? ariaRowCount;
   attribute DOMString? ariaRowIndex;
+  attribute DOMString? ariaRowIndexText;
   attribute DOMString? ariaRowSpan;
   attribute DOMString? ariaSelected;
   attribute DOMString? ariaSetSize;
diff --git a/tests/wpt/web-platform-tests/interfaces/webmidi.idl b/tests/wpt/web-platform-tests/interfaces/webmidi.idl
index aa2ac7f297b..58d6357f736 100644
--- a/tests/wpt/web-platform-tests/interfaces/webmidi.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webmidi.idl
@@ -12,11 +12,11 @@ dictionary MIDIOptions {
   boolean software;
 };
 
-interface MIDIInputMap {
+[SecureContext] interface MIDIInputMap {
   readonly maplike<DOMString, MIDIInput>;
 };
 
-interface MIDIOutputMap {
+[SecureContext] interface MIDIOutputMap {
   readonly maplike<DOMString, MIDIOutput>;
 };
 
diff --git a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
index 981317f6be4..f29e00d195e 100644
--- a/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webrtc-stats.idl
@@ -69,7 +69,9 @@ dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats {
              DOMString receiverId;
              DOMString remoteId;
              unsigned long framesDecoded;
+             unsigned long keyFramesDecoded;
              unsigned long long qpSum;
+             double totalDecodeTime;
              DOMHighResTimeStamp lastPacketReceivedTimestamp;
              double averageRtcpInterval;
              unsigned long fecPacketsReceived;
@@ -109,6 +111,7 @@ dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
              double targetBitrate;
              unsigned long long totalEncodedBytesTarget;
              unsigned long framesEncoded;
+             unsigned long keyFramesEncoded;
              unsigned long long qpSum;
              double totalEncodeTime;
              double totalPacketSendDelay;
@@ -187,7 +190,6 @@ dictionary RTCVideoSenderStats : RTCVideoHandlerStats {
              unsigned long framesCaptured;
              unsigned long framesSent;
              unsigned long hugeFramesSent;
-             unsigned long keyFramesSent;
 };
 
 dictionary RTCSenderVideoTrackAttachmentStats : RTCVideoSenderStats {
@@ -198,7 +200,6 @@ dictionary RTCVideoReceiverStats : RTCVideoHandlerStats {
              double jitterBufferDelay;
              unsigned long long jitterBufferEmittedCount;
              unsigned long framesReceived;
-             unsigned long keyFramesReceived;
              unsigned long framesDecoded;
              unsigned long framesDropped;
              unsigned long partialFramesLost;
@@ -359,3 +360,11 @@ partial dictionary RTCRtpStreamStats {
 partial dictionary RTCInboundRtpStreamStats {
           double fractionLost;
 };
+
+partial dictionary RTCVideoSenderStats {
+          unsigned long keyFramesSent;
+};
+
+partial dictionary RTCVideoReceiverStats {
+          unsigned long keyFramesReceived;
+};
diff --git a/tests/wpt/web-platform-tests/interfaces/webxr.idl b/tests/wpt/web-platform-tests/interfaces/webxr.idl
index 4af1c96a184..c78683ef6bf 100644
--- a/tests/wpt/web-platform-tests/interfaces/webxr.idl
+++ b/tests/wpt/web-platform-tests/interfaces/webxr.idl
@@ -171,6 +171,7 @@ interface XRInputSource {
   [SameObject] readonly attribute XRSpace targetRaySpace;
   [SameObject] readonly attribute XRSpace? gripSpace;
   [SameObject] readonly attribute Gamepad? gamepad;
+  [SameObject] readonly attribute FrozenArray<DOMString> profiles;
 };
 
 [SecureContext, Exposed=Window]
diff --git a/tests/wpt/web-platform-tests/kv-storage/api-surface.https.html b/tests/wpt/web-platform-tests/kv-storage/api-surface.https.html
deleted file mode 100644
index 90e705862d5..00000000000
--- a/tests/wpt/web-platform-tests/kv-storage/api-surface.https.html
+++ /dev/null
@@ -1,70 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>KV Storage: API surface</title>
-
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-
-<script type="module">
-import { storage, StorageArea } from "std:kv-storage";
-import * as classAssert from "./helpers/class-assert.js";
-import { testWithArea } from "./helpers/kvs-tests.js";
-
-test(() => {
-  classAssert.isConstructor(StorageArea);
-  classAssert.functionName(StorageArea, "StorageArea");
-  classAssert.functionLength(StorageArea, 1);
-  classAssert.hasClassPrototype(StorageArea);
-  classAssert.hasPrototypeConstructorLink(StorageArea);
-  classAssert.propertyKeys(StorageArea, ["length", "prototype", "name"], []);
-}, "StorageArea constructor");
-
-test(() => {
-  classAssert.propertyKeys(StorageArea.prototype, [
-    "constructor", "set", "get", "delete", "clear",
-    "keys", "values", "entries", "backingStore"
-  ], [
-    Symbol.asyncIterator
-  ]);
-
-  classAssert.methods(StorageArea.prototype, {
-    set: 2,
-    get: 1,
-    delete: 1,
-    clear: 0,
-    keys: 0,
-    values: 0,
-    entries: 0
-  });
-
-  classAssert.accessors(StorageArea.prototype, {
-    backingStore: ["get"]
-  });
-}, "StorageArea.prototype methods and properties");
-
-test(() => {
-  assert_equals(StorageArea.prototype[Symbol.asyncIterator], StorageArea.prototype.entries);
-}, "[Symbol.asyncIterator]() and entries() must be the same function");
-
-testWithArea(async area => {
-  classAssert.propertyKeys(area, [], []);
-}, "Instances don't have any properties");
-
-test(() => {
-  assert_equals(storage instanceof StorageArea, true, "instanceof");
-  assert_equals(storage.constructor, StorageArea, ".constructor property");
-  assert_equals(Object.getPrototypeOf(storage), StorageArea.prototype, "[[Prototype]]");
-}, "Built-in storage export is a StorageArea");
-
-testWithArea(async area => {
-  assert_false(Symbol.toStringTag in StorageArea.prototype,
-    "Symbol.toStringTag must not be in the prototype");
-  assert_equals(Object.prototype.toString.call(StorageArea.prototype), "[object Object]",
-    "The prototype must not be customized");
-
-  assert_equals(Object.prototype.toString.call(area), "[object Object]",
-    "A constructed StorageArea must not be customized");
-    assert_equals(Object.prototype.toString.call(storage), "[object Object]",
-    "The default storage area must not be customized");
-}, "No custom toStringTag");
-</script>
diff --git a/tests/wpt/web-platform-tests/kv-storage/cause-errors-via-idb.https.html b/tests/wpt/web-platform-tests/kv-storage/cause-errors-via-idb.https.html
index d77e56621e0..1a7294d093f 100644
--- a/tests/wpt/web-platform-tests/kv-storage/cause-errors-via-idb.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/cause-errors-via-idb.https.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: causing errors by directly manipulating the IDB</title>
+<meta name="timeout" content="long">
 
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
diff --git a/tests/wpt/web-platform-tests/kv-storage/entries.https.html b/tests/wpt/web-platform-tests/kv-storage/entries.https.html
index 0d1ab849a70..07815920d5e 100644
--- a/tests/wpt/web-platform-tests/kv-storage/entries.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/entries.https.html
@@ -1,13 +1,14 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: entries() trickier tests</title>
+<meta name="timeout" content="long">
 
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
 <script type="module">
 import { testWithArea } from "./helpers/kvs-tests.js";
-import * as classAssert from "./helpers/class-assert.js";
+import * as iterAssert from "./helpers/iter-assert.js";
 import {
   assertAsyncIteratorEquals,
   assertAsyncIteratorCustomEquals,
@@ -76,7 +77,7 @@ testWithArea(async area => {
     await iter.next()
   ];
 
-  classAssert.iterResultsCustom(
+  iterAssert.iterResultsCustom(
     iterResults,
     [
       [[1, "value 1"], false],
@@ -106,7 +107,7 @@ testWithArea(async area => {
   ];
   const iterResults = await Promise.all(promises);
 
-  classAssert.iterResultsCustom(
+  iterAssert.iterResultsCustom(
     iterResults,
     [
       [[1, "value 1"], false],
diff --git a/tests/wpt/web-platform-tests/kv-storage/helpers/class-assert.js b/tests/wpt/web-platform-tests/kv-storage/helpers/class-assert.js
deleted file mode 100644
index 89f0889c56d..00000000000
--- a/tests/wpt/web-platform-tests/kv-storage/helpers/class-assert.js
+++ /dev/null
@@ -1,139 +0,0 @@
-export function isConstructor(o) {
-  assert_equals(typeof o, "function", "Must be a function according to typeof");
-  assert_true(isConstructorTest(o), "Must be a constructor according to the meta-object protocol");
-  assert_throws(new TypeError(), () => o(), "Attempting to call (not construct) must throw");
-}
-
-export function functionLength(o, expected, label) {
-  const lengthExpected = { writable: false, enumerable: false, configurable: true };
-  const { value } = propertyDescriptor(o, "length", lengthExpected);
-
-  assert_equals(value, expected, `${formatLabel(label)}length value`);
-}
-
-export function functionName(o, expected, label) {
-  const lengthExpected = { writable: false, enumerable: false, configurable: true };
-  const { value } = propertyDescriptor(o, "name", lengthExpected);
-
-  assert_equals(value, expected, `${formatLabel(label)}name value`);
-}
-
-export function hasClassPrototype(o) {
-  const prototypeExpected = { writable: false, enumerable: false, configurable: false };
-  const { value } = propertyDescriptor(o, "prototype", prototypeExpected);
-  assert_equals(typeof value, "object", "prototype must be an object");
-  assert_not_equals(value, null, "prototype must not be null");
-}
-
-export function hasPrototypeConstructorLink(klass) {
-  const constructorExpected = { writable: true, enumerable: false, configurable: true };
-  const { value } = propertyDescriptor(klass.prototype, "constructor", constructorExpected);
-  assert_equals(value, klass, "constructor property must match");
-}
-
-export function propertyKeys(o, expectedNames, expectedSymbols, label) {
-  label = formatLabel(label);
-  assert_array_equals(Object.getOwnPropertyNames(o), expectedNames, `${label}property names`);
-  assert_array_equals(Object.getOwnPropertySymbols(o), expectedSymbols,
-    `${label}property symbols`);
-}
-
-export function iterResultCustom(o, expectedValue, expectedDone, valueAsserter, label) {
-  label = formatLabel(label);
-
-  assert_equals(typeof expectedDone, "boolean",
-    `${label} iterResult assert usage check: expectedDone must be a boolean`);
-
-  propertyKeys(o, ["value", "done"], [], label);
-  assert_equals(Object.getPrototypeOf(o), Object.prototype, `${label}prototype must be Object.prototype`);
-  valueAsserter(o.value, expectedValue, `${label}value`);
-  assert_equals(o.done, expectedDone, `${label}done`);
-}
-
-export function iterResult(o, expectedValue, expectedDone, label) {
-  return iterResultCustom(o, expectedValue, expectedDone, assert_equals, label);
-}
-
-export function iterResultsCustom(actualArray, expectedArrayOfArrays, valueAsserter, label) {
-  label = formatLabel(label);
-
-  assert_equals(actualArray.length, expectedArrayOfArrays.length,
-    `${label} iterResults assert usage check: actual and expected must have the same length`);
-
-  for (let i = 0; i < actualArray.length; ++i) {
-    const [expectedValue, expectedDone] = expectedArrayOfArrays[i];
-    iterResultCustom(actualArray[i], expectedValue, expectedDone, valueAsserter, `${label}iter result ${i}`);
-  }
-}
-
-export function iterResults(actualArray, expectedArrayOfArrays, label) {
-  return iterResultsCustom(actualArray, expectedArrayOfArrays, assert_equals, label);
-}
-
-export function methods(o, expectedMethods) {
-  for (const [name, length] of Object.entries(expectedMethods)) {
-    method(o, name, length);
-  }
-}
-
-export function accessors(o, expectedAccessors) {
-  for (const [name, accessorTypes] of Object.entries(expectedAccessors)) {
-    accessor(o, name, accessorTypes);
-  }
-}
-
-function method(o, prop, length) {
-  const methodExpected = { writable: true, enumerable: false, configurable: true };
-  const { value } = propertyDescriptor(o, prop, methodExpected);
-
-  assert_equals(typeof value, "function", `${prop} method must be a function according to typeof`);
-  assert_false(isConstructorTest(value),
-    `${prop} method must not be a constructor according to the meta-object protocol`);
-  functionLength(value, length, prop);
-  functionName(value, prop, prop);
-  propertyKeys(value, ["length", "name"], [], prop);
-}
-
-function accessor(o, prop, expectedAccessorTypes) {
-  const accessorExpected = { enumerable: false, configurable: true };
-  const propDesc = propertyDescriptor(o, prop, accessorExpected);
-
-  for (const possibleType of ["get", "set"]) {
-    const accessorFunc = propDesc[possibleType];
-    if (expectedAccessorTypes.includes(possibleType)) {
-      const label = `${prop}'s ${possibleType}ter`;
-
-      assert_equals(typeof accessorFunc, "function",
-        `${label} must be a function according to typeof`);
-      assert_false(isConstructorTest(accessorFunc),
-        `${label} must not be a constructor according to the meta-object protocol`);
-
-      functionLength(accessorFunc, possibleType === "get" ? 0 : 1, label);
-      functionName(accessorFunc, `${possibleType} ${prop}`, label);
-      propertyKeys(accessorFunc, ["length", "name"], [], label);
-    } else {
-      assert_equals(accessorFunc, undefined, `${prop} must not have a ${possibleType}ter`);
-    }
-  }
-}
-
-function propertyDescriptor(obj, prop, mustMatch) {
-  const propDesc = Object.getOwnPropertyDescriptor(obj, prop);
-  for (const key in Object.keys(mustMatch)) {
-    assert_equals(propDesc[key], mustMatch[key], `${prop} ${key}`);
-  }
-  return propDesc;
-}
-
-function isConstructorTest(o) {
-  try {
-    new (new Proxy(o, {construct: () => ({})}));
-    return true;
-  } catch (e) {
-    return false;
-  }
-}
-
-function formatLabel(label) {
-  return label !== undefined ? `${label} ` : "";
-}
diff --git a/tests/wpt/web-platform-tests/kv-storage/helpers/expose-as-global.html b/tests/wpt/web-platform-tests/kv-storage/helpers/expose-as-global.html
new file mode 100644
index 00000000000..4ff3c6cf9c2
--- /dev/null
+++ b/tests/wpt/web-platform-tests/kv-storage/helpers/expose-as-global.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Helper file to be loaded in an iframe that exposes a copy of StorageArea as a global</title>
+
+<script type="module">
+import { StorageArea } from "std:kv-storage";
+window.StorageArea = StorageArea;
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/kv-storage/helpers/iter-assert.js b/tests/wpt/web-platform-tests/kv-storage/helpers/iter-assert.js
new file mode 100644
index 00000000000..e1ac73c8e9a
--- /dev/null
+++ b/tests/wpt/web-platform-tests/kv-storage/helpers/iter-assert.js
@@ -0,0 +1,42 @@
+export function iterResultCustom(o, expectedValue, expectedDone, valueAsserter, label) {
+  label = formatLabel(label);
+
+  assert_equals(typeof expectedDone, "boolean",
+    `${label} iterResult assert usage check: expectedDone must be a boolean`);
+
+  propertyKeys(o, ["value", "done"], [], label);
+  assert_equals(Object.getPrototypeOf(o), Object.prototype, `${label}prototype must be Object.prototype`);
+  valueAsserter(o.value, expectedValue, `${label}value`);
+  assert_equals(o.done, expectedDone, `${label}done`);
+}
+
+export function iterResult(o, expectedValue, expectedDone, label) {
+  return iterResultCustom(o, expectedValue, expectedDone, assert_equals, label);
+}
+
+export function iterResultsCustom(actualArray, expectedArrayOfArrays, valueAsserter, label) {
+  label = formatLabel(label);
+
+  assert_equals(actualArray.length, expectedArrayOfArrays.length,
+    `${label} iterResults assert usage check: actual and expected must have the same length`);
+
+  for (let i = 0; i < actualArray.length; ++i) {
+    const [expectedValue, expectedDone] = expectedArrayOfArrays[i];
+    iterResultCustom(actualArray[i], expectedValue, expectedDone, valueAsserter, `${label}iter result ${i}`);
+  }
+}
+
+export function iterResults(actualArray, expectedArrayOfArrays, label) {
+  return iterResultsCustom(actualArray, expectedArrayOfArrays, assert_equals, label);
+}
+
+function propertyKeys(o, expectedNames, expectedSymbols, label) {
+  label = formatLabel(label);
+  assert_array_equals(Object.getOwnPropertyNames(o), expectedNames, `${label}property names`);
+  assert_array_equals(Object.getOwnPropertySymbols(o), expectedSymbols,
+    `${label}property symbols`);
+}
+
+function formatLabel(label) {
+  return label !== undefined ? `${label} ` : "";
+}
diff --git a/tests/wpt/web-platform-tests/kv-storage/interface.https.html b/tests/wpt/web-platform-tests/kv-storage/interface.https.html
new file mode 100644
index 00000000000..ab1930b25c3
--- /dev/null
+++ b/tests/wpt/web-platform-tests/kv-storage/interface.https.html
@@ -0,0 +1,175 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>KV Storage: IDL interface tests</title>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+
+<script type="module">
+import { storage, StorageArea } from "std:kv-storage";
+
+// Web IDL/idlharness.js do not yet have support for the spec's IDL, which uses module {},
+// async_iterator, and some new extended attributes. This IDL is a mutated version to work with the
+// current idlharness.js to get some coverage.
+//
+// When the relevant Web IDL PRs land and idlharness.js gets updated, we can replace this file with
+// a normal-style idlharness test, with the IDL scraped from the spec.
+//
+// Other tests in this file are similarly ones that should be generatable from the IDL, in theory.
+
+const idl = `
+[Constructor(DOMString name)]
+interface StorageArea {
+  Promise<void> set(any key, any value);
+  Promise<any> get(any key);
+  Promise<void> delete(any key);
+  Promise<void> clear();
+
+//  async_iterable<any, any>;
+
+  [SameObject] readonly attribute object backingStore;
+};
+`;
+
+// Define a global property because idlharness.js only understands
+// global properties, not modules.
+Object.defineProperty(window, "StorageArea", {
+  configurable: true,
+  enumerable: false,
+  writable: true,
+  value: StorageArea
+});
+
+test(t => {
+  window.testStorageArea = storage;
+  t.add_cleanup(() => {
+    delete window.testStorageArea;
+  });
+
+  const idlArray = new IdlArray();
+  idlArray.add_idls(idl);
+  idlArray.add_objects({ StorageArea: ["window.testStorageArea"] });
+  idlArray.test();
+}, "idlharness basic interface tests");
+
+test(() => {
+  assert_equals(storage instanceof StorageArea, true, "instanceof");
+  assert_equals(storage.constructor, StorageArea, ".constructor property");
+  assert_equals(Object.getPrototypeOf(storage), StorageArea.prototype, "[[Prototype]]");
+}, "Built-in storage export is a StorageArea");
+
+// These should be auto-tested by idlharness eventually, similar to
+// https://github.com/web-platform-tests/wpt/blob/3725067ef0328c998be2ba93dbaeb0579586fccd/resources/idlharness.js#L2452
+// for sync iterators (although this tests more than that does).
+test(() => {
+  for (const methodName of ["keys", "values", "entries"]) {
+    const descriptor = Object.getOwnPropertyDescriptor(StorageArea.prototype, methodName);
+
+    assert_true(descriptor.writable, `${methodName} property should be writable`);
+    assert_true(descriptor.configurable, `${methodName} property should be configurable`);
+
+    // May need updating if https://github.com/heycam/webidl/issues/738 changes the spec
+    assert_true(descriptor.enumerable, `${methodName} property should be enumerable`);
+
+    assert_equals(typeof descriptor.value, "function",
+      `${methodName} property should be a function`);
+    assert_equals(descriptor.value.length, 0, `${methodName} function object length should be 0`);
+    assert_equals(descriptor.value.name, methodName,
+      `${methodName} function object should have the right name`);
+
+    assert_throws(new TypeError(), () => descriptor.value.call(StorageArea.prototype),
+      `${methodName} should throw when called on the prototype directly`);
+      assert_throws(new TypeError(), () => descriptor.value.call({}),
+      `${methodName} should throw when called on an empty object`);
+  }
+
+  const AsyncIteratorPrototype =
+    Object.getPrototypeOf(Object.getPrototypeOf(async function*() {}).prototype);
+  const asyncIteratorProto = Object.getPrototypeOf(storage.keys());
+  assert_equals(Object.getPrototypeOf(storage.values()), asyncIteratorProto,
+    "keys() and values() return values must have the same prototype");
+  assert_equals(Object.getPrototypeOf(storage.entries()), asyncIteratorProto,
+    "keys() and entries() return values must have the same prototype");
+
+  assert_equals(Object.getPrototypeOf(asyncIteratorProto), AsyncIteratorPrototype,
+    "[[Prototype]] must be the async iterator prototype");
+
+  assert_array_equals(Object.getOwnPropertyNames(asyncIteratorProto), ["next"],
+      `async iterator prototype object must have a next method`);
+
+  const nextMethodDescriptor = Object.getOwnPropertyDescriptor(asyncIteratorProto, "next");
+  assert_true(nextMethodDescriptor.writable, `async iterator next property should be writable`);
+  assert_true(nextMethodDescriptor.configurable,
+    `async iterator next property should be configurable`);
+
+  // May need updating if https://github.com/heycam/webidl/issues/739 changes the spec
+  assert_true(nextMethodDescriptor.enumerable,
+    `async iterator next property should be enumerable`);
+
+  assert_equals(typeof nextMethodDescriptor.value, "function",
+    `async iterator next property should be a function`);
+  assert_equals(nextMethodDescriptor.value.length, 0,
+    `async iterator next function object length should be 0`);
+  assert_equals(nextMethodDescriptor.value.name, "next",
+    `async iterator next function object should have the right name`);
+
+  assert_array_equals(Object.getOwnPropertySymbols(asyncIteratorProto), [Symbol.toStringTag]);
+  const toStringTagDescriptor = Object.getOwnPropertyDescriptor(
+    asyncIteratorProto,
+    Symbol.toStringTag
+  );
+  assert_false(toStringTagDescriptor.writable,
+    `async iterator @@toStringTag property should be non-writable`);
+  assert_true(toStringTagDescriptor.configurable,
+    `async iterator @@toStringTag property should be configurable`);
+  assert_false(toStringTagDescriptor.enumerable,
+    `async iterator @@toStringTag property should be non-enumerable`);
+  assert_equals(toStringTagDescriptor.value, "StorageArea AsyncIterator",
+    `async iterator @@toStringTag property should have the right value`);
+
+  assert_equals(StorageArea.prototype[Symbol.asyncIterator], StorageArea.prototype.entries,
+    "@@asyncIterator method should be the same as entries");
+}, "@@asyncIterator tests");
+
+promise_test(async t => {
+  const iframe = document.createElement("iframe");
+  iframe.src = "helpers/expose-as-global.html";
+  document.body.append(iframe);
+
+  await frameLoadPromise(iframe);
+  const OtherStorageArea = iframe.contentWindow.StorageArea;
+
+  await promise_rejects(t, new TypeError(),
+    OtherStorageArea.prototype.set.call(storage, "testkey", "testvalue"),
+    `set() must reject cross-realm`);
+  await promise_rejects(t, new TypeError(),
+    OtherStorageArea.prototype.get.call(storage, "testkey"),
+    `get() must reject cross-realm`);
+  await promise_rejects(t, new TypeError(),
+    OtherStorageArea.prototype.delete.call(storage, "testkey"),
+    `delete() must reject cross-realm`);
+  await promise_rejects(t, new TypeError(), OtherStorageArea.prototype.clear.call(storage),
+    `clear() must reject cross-realm`);
+
+  assert_throws(new TypeError(), () => OtherStorageArea.prototype.keys.call(storage),
+    `keys() must throw cross-realm`);
+  assert_throws(new TypeError(), () => OtherStorageArea.prototype.values.call(storage),
+    `values() must throw cross-realm`);
+  assert_throws(new TypeError(), () => OtherStorageArea.prototype.entries.call(storage),
+    `entries() must throw cross-realm`);
+
+  const otherBackingStoreGetter =
+    Object.getOwnPropertyDescriptor(OtherStorageArea.prototype, "backingStore").get;
+  assert_throws(new TypeError(), () => otherBackingStoreGetter.call(storage),
+    `backingStore must throw cross-realm`);
+}, "Same-realm brand checks");
+
+function frameLoadPromise(frame) {
+  return new Promise((resolve, reject) => {
+    frame.onload = resolve;
+    frame.onerror = () => reject(new Error(`${frame.src} failed to load`));
+  });
+}
+</script>
\ No newline at end of file
diff --git a/tests/wpt/web-platform-tests/kv-storage/keys-values-entries.https.html b/tests/wpt/web-platform-tests/kv-storage/keys-values-entries.https.html
index b26323809bb..27ad3e4f186 100644
--- a/tests/wpt/web-platform-tests/kv-storage/keys-values-entries.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/keys-values-entries.https.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: keys()/values()/entries()</title>
+<meta name="timeout" content="long">
+
 <!--
   This file contains tests that are easy to generalize over all three methods.
   See sibling files for more complicated tests which are not worth generalizing.
@@ -12,30 +14,11 @@
 
 <script type="module">
 import { testWithArea } from "./helpers/kvs-tests.js";
-import * as classAssert from "./helpers/class-assert.js";
+import * as iterAssert from "./helpers/iter-assert.js";
 import { assertAsyncIteratorEquals } from "./helpers/equality-asserters.js";
 // Also uses some global functions included via support-promises.js.
 
-const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function*() {}).prototype);
-
-testWithArea(async area => {
-  const keysProto = Object.getPrototypeOf(area.keys());
-  const valuesProto = Object.getPrototypeOf(area.values());
-  const entriesProto = Object.getPrototypeOf(area.entries());
-
-  assert_equals(keysProto, valuesProto, "keys() and values() return values' must have the same [[Prototype]]");
-  assert_equals(valuesProto, entriesProto, "values() and entries () return values' must have the same [[Prototype]]");
-}, "keys()/values()/entries() all use the same prototype object");
-
 for (const method of ["keys", "values", "entries"]) {
-  testWithArea(async area => {
-    const iter = area[method]();
-    const proto = Object.getPrototypeOf(iter);
-    assert_equals(Object.getPrototypeOf(proto), AsyncIteratorPrototype,
-      "[[Prototype]] must be the async iterator prototype");
-    classAssert.propertyKeys(proto, ["next"], [], "must only have a next() method");
-  }, `${method}() return value is an async iterator of the expected shape`);
-
   testWithArea(async area => {
     const iter = area[method]();
     const promise = iter.next();
@@ -47,7 +30,7 @@ for (const method of ["keys", "values", "entries"]) {
       await iter.next()
     ];
 
-    classAssert.iterResults(iterResults, [
+    iterAssert.iterResults(iterResults, [
       [undefined, true],
       [undefined, true]
     ]);
diff --git a/tests/wpt/web-platform-tests/kv-storage/keys.https.html b/tests/wpt/web-platform-tests/kv-storage/keys.https.html
index a6be29725bf..3535d2fb939 100644
--- a/tests/wpt/web-platform-tests/kv-storage/keys.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/keys.https.html
@@ -1,13 +1,14 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: keys() trickier tests</title>
+<meta name="timeout" content="long">
 
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
 <script type="module">
 import { testWithArea } from "./helpers/kvs-tests.js";
-import * as classAssert from "./helpers/class-assert.js";
+import * as iterAssert from "./helpers/iter-assert.js";
 import {
   assertAsyncIteratorEquals,
   assertAsyncIteratorCustomEquals,
@@ -62,7 +63,7 @@ testWithArea(async area => {
     await iter.next()
   ];
 
-  classAssert.iterResults(iterResults, [
+  iterAssert.iterResults(iterResults, [
     [1, false],
     [2, false],
     [3, false],
@@ -88,7 +89,7 @@ testWithArea(async area => {
   ];
   const iterResults = await Promise.all(promises);
 
-  classAssert.iterResults(iterResults, [
+  iterAssert.iterResults(iterResults, [
     [1, false],
     [2, false],
     [3, false],
diff --git a/tests/wpt/web-platform-tests/kv-storage/storage-smoke-test.https.html b/tests/wpt/web-platform-tests/kv-storage/storage-smoke-test.https.html
index da48dc7cf13..31dac972d98 100644
--- a/tests/wpt/web-platform-tests/kv-storage/storage-smoke-test.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/storage-smoke-test.https.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV storage: storage export smoke test</title>
+<meta name="timeout" content="long">
 
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
diff --git a/tests/wpt/web-platform-tests/kv-storage/undefined-value.https.html b/tests/wpt/web-platform-tests/kv-storage/undefined-value.https.html
index 4cb483a3d98..d87641e95b8 100644
--- a/tests/wpt/web-platform-tests/kv-storage/undefined-value.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/undefined-value.https.html
@@ -1,6 +1,8 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: undefined values</title>
+<meta name="timeout" content="long">
+
 <!-- https://github.com/wicg/kv-storage/commit/5bf31109f37d1371f619ea33d0e2391f10e8b8f5 -->
 
 <script src="/resources/testharness.js"></script>
diff --git a/tests/wpt/web-platform-tests/kv-storage/values.https.html b/tests/wpt/web-platform-tests/kv-storage/values.https.html
index 64756bf195f..bbdc7aee844 100644
--- a/tests/wpt/web-platform-tests/kv-storage/values.https.html
+++ b/tests/wpt/web-platform-tests/kv-storage/values.https.html
@@ -1,13 +1,14 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <title>KV Storage: values() trickier tests</title>
+<meta name="timeout" content="long">
 
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
 <script type="module">
 import { testWithArea } from "./helpers/kvs-tests.js";
-import * as classAssert from "./helpers/class-assert.js";
+import * as iterAssert from "./helpers/iter-assert.js";
 import { assertAsyncIteratorEquals } from "./helpers/equality-asserters.js";
 
 testWithArea(async area => {
@@ -57,7 +58,7 @@ testWithArea(async area => {
     await iter.next()
   ];
 
-  classAssert.iterResults(iterResults, [
+  iterAssert.iterResults(iterResults, [
     ["value 1", false],
     ["value 2", false],
     ["value 3", false],
@@ -83,7 +84,7 @@ testWithArea(async area => {
   ];
   const iterResults = await Promise.all(promises);
 
-  classAssert.iterResults(iterResults, [
+  iterAssert.iterResults(iterResults, [
     ["value 1", false],
     ["value 2", false],
     ["value 3", false],
diff --git a/tests/wpt/web-platform-tests/service-workers/service-worker/interfaces-sw.https.html b/tests/wpt/web-platform-tests/service-workers/service-worker/interfaces-sw.https.html
index 50c76d306dc..73ffb28b36e 100644
--- a/tests/wpt/web-platform-tests/service-workers/service-worker/interfaces-sw.https.html
+++ b/tests/wpt/web-platform-tests/service-workers/service-worker/interfaces-sw.https.html
@@ -6,6 +6,8 @@
 <script>
 'use strict';
 
+// NOTE: affected when 'resources/interfaces-worker.sub.js' srcs change:
+// const srcs = ['dom', 'html', 'service-workers', 'dedicated-workers'];
 service_worker_test(
   'resources/interfaces-worker.sub.js',
   'Interfaces and attributes in ServiceWorkerGlobalScope');