From 29c206a7021d23d90303325505ec4e8888fc5387 Mon Sep 17 00:00:00 2001
From: Servo WPT Sync <32481905+servo-wpt-sync@users.noreply.github.com>
Date: Mon, 5 Feb 2024 01:17:23 -0500
Subject: [PATCH] Sync WPT with upstream (04-02-2024) (#31256)

* Update web-platform-tests to revision b'faa6d42ce21d126155dee771786ad7c74efbcba5'

* Update test expectation

---------

Co-authored-by: cybai <cyb.ai.815@gmail.com>
---
 ...kground-color-transition-colormix.html.ini |    3 +
 .../css-color/system-color-support.html.ini   |    6 +
 .../abspos/position-absolute-013.html.ini     |    1 -
 .../align-content-wrap-003.html.ini           |    4 -
 ...stifycontent-spacearound-negative.html.ini |    2 +
 .../parsing/text-wrap-pretty.html.ini         |   42 +
 .../user-find-computed.tentative.html.ini     |    6 +
 .../user-find-valid.tentative.html.ini        |    6 +
 .../css/css-ui/user-find.tentative.html.ini   |    3 +
 ...internals-aria-element-reflection.html.ini |    2 +
 .../ElementInternals-states.html.ini          |   12 +-
 .../custom-state-set-strong-ref.html.ini      |    2 +
 .../state-css-selector-shadow-dom.html.ini    |    2 +
 .../state/state-css-selector.html.ini         |    2 +
 .../state/state-pseudo-class.html.ini         |   18 +
 .../tentative/state-pseudo-class.html.ini     |   51 -
 .../observable/tentative/idlharness.html.ini  |  102 +
 .../observable-constructor.any.js.ini         |   30 +
 .../tentative/observable-takeUntil.any.js.ini |   68 +
 .../observable-takeUntil.window.js.ini        |    6 +
 .../worker-blob-fetch.tentative.window.js.ini |    3 +
 .../order-in-bfcache-restore.html.ini         |    0
 .../order-in-new-document-navigation.html.ini |    0
 .../order-in-prerender-activation.html.ini    |    0
 .../srcdoc/consecutive-srcdoc.html.ini        |    3 +-
 .../empty-iframe-load-event.html.ini          |    6 -
 ...url-return-value-handling-dynamic.html.ini |   15 +
 ...tion-unload-cross-origin.sub.window.js.ini |    3 +
 ...avigation-unload-same-origin.window.js.ini |    3 +
 ...creating_browsing_context_test_01.html.ini |    3 -
 .../2d.layer.clearRect.partial.html.ini       |    2 +
 .../layers/unclosed-nested-layers.html.ini    |    2 -
 .../layers/2d.layer.clearRect.full.html.ini   |    2 +
 .../layers/2d.layer.clearRect.full.w.html.ini |    2 +
 .../2d.layer.clearRect.partial.html.ini       |    2 +
 .../2d.layer.clearRect.partial.w.html.ini     |    2 +
 ...path.stroke.prune.closePath.arc.w.html.ini |    2 -
 ...oke.prune.closePath.bezierCurve.w.html.ini |    2 -
 ...ath.stroke.prune.closePath.line.w.html.ini |    2 -
 ....prune.closePath.quadraticCurve.w.html.ini |    2 -
 ...nitiator-is-not-opener.https.window.js.ini |    1 +
 .../document-with-fragment-empty.html.ini     |    3 +-
 .../unicode-bidi-ua-rules.html.ini            |    3 +
 .../iframe_sandbox_popups_escaping-2.html.ini |    3 +-
 .../iframe_sandbox_popups_escaping-3.html.ini |    1 -
 ...rame_sandbox_popups_nonescaping-1.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-2.html.ini |    3 +-
 ...rm-during-planned-navigation-task.html.ini |    4 -
 .../html/semantics/forms/historical.html.ini  |    3 +
 .../select-parsing.tentative.html.ini         |    3 +
 .../htmlanchorelement_noopener.html.ini       |    3 +-
 .../popovertarget-reflection.html.ini         |    3 +
 .../parsing/DOMContentLoaded-defer.html.ini   |    3 -
 .../parsing/unclosed-svg-script.html.ini      |    2 +
 .../document-write/module-delayed.html.ini    |    3 +
 ...le-event-handler-settings-objects.html.ini |    2 +-
 ...ob-entry-different-function-realm.html.ini |    5 +-
 .../test_resource_timing.html.ini             |    3 +
 .../webmessaging/with-ports}/017.html.ini     |    0
 .../stream/tentative/close.any.js.ini         |   72 +
 .../tentative/websocket-error.any.js.ini      |   68 +
 ...st-party.all.tentative.https.window.js.ini |    3 +
 ...arty.default.tentative.https.window.js.ini |    3 +
 ...t-party.none.tentative.https.window.js.ini |    3 +
 ....default.tentative.sub.https.window.js.ini |    3 +
 ...rty.none.tentative.sub.https.window.js.ini |    3 +
 tests/wpt/meta/MANIFEST.json                  | 2245 +++++++++++++----
 ...kground-color-transition-colormix.html.ini |    3 +
 .../css-color/system-color-support.html.ini   |    6 +
 .../align-content-wrap-003.html.ini           |    3 -
 .../at-font-face-font-matching.html.ini       |   57 +-
 .../table-cell-scroll-height.html.ini         |    3 +
 .../parsing/text-wrap-pretty.html.ini         |   42 +
 .../user-find-computed.tentative.html.ini     |    6 +
 .../user-find-valid.tentative.html.ini        |    6 +
 .../css/css-ui/user-find.tentative.html.ini   |    3 +
 ...QueryList-addListener-handleEvent.html.ini |    3 +
 ...ryList-addListener-removeListener.html.ini |    3 +
 ...internals-aria-element-reflection.html.ini |    2 +
 .../ElementInternals-states.html.ini          |   12 +-
 .../custom-state-set-strong-ref.html.ini      |    2 +
 .../state-css-selector-shadow-dom.html.ini    |    2 +
 .../state/state-css-selector.html.ini         |    2 +
 .../state/state-pseudo-class.html.ini         |   18 +
 .../tentative/state-pseudo-class.html.ini     |   51 -
 .../observable/tentative/idlharness.html.ini  |  102 +
 .../observable-constructor.any.js.ini         |   30 +
 .../tentative/observable-takeUntil.any.js.ini |   68 +
 .../observable-takeUntil.window.js.ini        |    6 +
 ...lement-img-environment-change.sub.html.ini |    9 +-
 .../order-in-bfcache-restore.html.ini         |    0
 .../order-in-new-document-navigation.html.ini |    0
 .../order-in-prerender-activation.html.ini    |    0
 ...eshow-events-iframe-contentWindow.html.ini |    3 +
 .../navigate-to-unparseable-url.html.ini      |    3 +
 .../pageload-image-in-popup.html.ini          |    3 +
 .../traverse_the_history_2.html.ini           |    3 +
 .../traverse_the_history_4.html.ini           |    3 +
 ...creating_browsing_context_test_01.html.ini |    3 -
 .../2d.layer.clearRect.partial.html.ini       |    2 +
 .../layers/unclosed-nested-layers.html.ini    |    2 -
 .../layers/2d.layer.clearRect.full.html.ini   |    2 +
 .../layers/2d.layer.clearRect.full.w.html.ini |    2 +
 .../2d.layer.clearRect.partial.html.ini       |    2 +
 .../2d.layer.clearRect.partial.w.html.ini     |    2 +
 ...d.path.stroke.prune.closePath.arc.html.ini |    2 -
 ...path.stroke.prune.closePath.arc.w.html.ini |    2 -
 ...troke.prune.closePath.bezierCurve.html.ini |    2 -
 ...oke.prune.closePath.bezierCurve.w.html.ini |    2 -
 ....path.stroke.prune.closePath.line.html.ini |    2 -
 ...ath.stroke.prune.closePath.line.w.html.ini |    2 -
 ...ke.prune.closePath.quadraticCurve.html.ini |    2 -
 ....prune.closePath.quadraticCurve.w.html.ini |    2 -
 .../unicode-bidi-ua-rules.html.ini            |  150 ++
 .../iframe_sandbox_popups_escaping-1.html.ini |    1 +
 .../iframe_sandbox_popups_escaping-2.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-2.html.ini |    3 +-
 .../non-active-document.html.ini              |    9 +
 ...rm-during-planned-navigation-task.html.ini |    4 -
 .../urlencoded2.window.js.ini                 |    3 +
 .../select-parsing.tentative.html.ini         |    3 +
 .../popovertarget-reflection.html.ini         |    3 +
 .../defer-script/async-script.html.ini        |    0
 .../parsing/unclosed-svg-script.html.ini      |    3 +
 ...le-event-handler-settings-objects.html.ini |    3 -
 ...ob-entry-different-function-realm.html.ini |    5 +-
 .../content-type-parsing.html.ini             |    4 +-
 .../test_resource_timing.html.ini             |    3 -
 .../webmessaging/without-ports/018.html.ini   |    4 -
 .../stream/tentative/close.any.js.ini         |   72 +
 .../tentative/websocket-error.any.js.ini      |   69 +
 ...s-3P-window.partitioned.tentative.html.ini |    4 -
 .../alpha/import-in-moduleworker.html.ini     |    1 +
 ...st-party.all.tentative.https.window.js.ini |    3 +
 ...arty.default.tentative.https.window.js.ini |    3 +
 ...t-party.none.tentative.https.window.js.ini |    3 +
 ....default.tentative.sub.https.window.js.ini |    3 +
 ...rty.none.tentative.sub.https.window.js.ini |    3 +
 .../crashtests/aria-owns-presentation.html    |    3 +
 .../crashtests/illegal-aria-owns-from-br.html |    3 +
 .../script-src/nonce-enforce-blocked.html     |   26 +-
 .../fedcm-userinfo-after-resolve.https.html   |   45 +
 .../float-rewind-parallel-flow-1-crash.html   |   22 +
 .../float-rewind-parallel-flow-2-crash.html   |   34 +
 .../float-rewind-parallel-flow-3-crash.html   |   56 +
 ... anchor-name-style-contained-dynamic.html} |   50 +-
 .../anchor-name-style-contained.html          |   60 +
 ...anchor-name-style-contained.tentative.html |   51 -
 .../anchor-position-dynamic-004.html          |    2 +-
 .../background-color-transition-colormix.html |   53 +
 .../css/css-cascade/all-prop-initial-xml.html |    2 +
 .../light-dark-currentcolor-in-color.html     |   21 +
 .../css/css-color/system-color-support.html   |  124 +-
 .../container-name-tree-scoped.html           |   19 +
 ...content-visibility-with-top-layer-008.html |   46 +
 .../display-contents-role-and-label.html      |  302 +++
 .../display-contents-001-crash.html           |   13 +
 ...splay-contents-fieldset-nested-legend.html |    1 +
 .../focus/display-contents-focus.html         |   49 +
 .../css-flexbox/align-content-wrap-003.html   |   36 +-
 ...lexbox-justify-content-horiz-003-ref.xhtml |   12 +-
 ...lexbox-justify-content-horiz-004-ref.xhtml |   18 +-
 ...flexbox-justify-content-vert-003-ref.xhtml |   12 +-
 ...flexbox-justify-content-vert-004-ref.xhtml |   12 +-
 ...stifycontent-spacearound-negative-ref.html |    6 +-
 .../grid-content-distribution-026.html        |    4 +-
 .../grid-content-distribution-027.html        |    4 +-
 .../grid-content-distribution-029.html        |    9 +
 .../alignment/grid-place-content-001.html     |    4 +-
 .../css-grid/subgrid/grid-gap-006-ref.html    |    2 +-
 .../scrollbar-gutter-fixedpos-001-ref.html    |   21 +
 .../scrollbar-gutter-fixedpos-001.html        |   23 +
 .../scrollbar-gutter-fixedpos-002-ref.html    |   21 +
 .../scrollbar-gutter-fixedpos-002.html        |   23 +
 .../css-tables/table-cell-scroll-height.html  |   12 +
 .../text-shadow/standards-decor-noblur-2.html |    2 +-
 .../css-text/parsing/text-wrap-computed.html  |    5 -
 .../css-text/parsing/text-wrap-pretty.html    |   34 +
 .../parsing/text-wrap-style-computed.html     |    1 -
 .../parsing/text-wrap-style-valid.html        |    1 -
 .../css/css-text/parsing/text-wrap-valid.html |    5 -
 .../text-transform-uppercase-dynamic-ref.html |    8 +
 .../text-transform-uppercase-dynamic.html     |   20 +
 .../transition-timing-function.html           |    4 +-
 tests/wpt/tests/css/css-ui/inheritance.html   |    3 +
 .../parsing/user-find-computed.tentative.html |   19 +
 .../parsing/user-find-invalid.tentative.html  |   20 +
 .../parsing/user-find-valid.tentative.html    |   18 +
 .../tests/css/css-ui/user-find.tentative.html |   57 +
 .../minmax-percentage-serialize.html          |   22 +
 .../pseudo-elements-invalid-with-classes.html |   32 +
 .../pseudo-elements-valid-with-classes.html   |   33 +
 ...resize-aborts-transition-before-ready.html |   60 +
 ...arance-native-horizontal-rtl.optional.html |   12 +
 ...appearance-native-horizontal.optional.html |    1 +
 ...pearance-native-vertical-rtl.optional.html |   12 +
 ...r-appearance-native-vertical.optional.html |    3 +-
 ...arance-native-horizontal-rtl.optional.html |   13 +
 ...appearance-native-horizontal.optional.html |    3 +-
 ...pearance-native-vertical-rtl.optional.html |   13 +
 ...s-appearance-native-vertical.optional.html |    3 +-
 ...pearance-none-horizontal-rtl.optional.html |   13 +
 ...s-appearance-none-horizontal.optional.html |    3 +-
 ...appearance-none-vertical-rtl.optional.html |   13 +
 ...ess-appearance-none-vertical.optional.html |    3 +-
 .../unicode-bidi-parsing-001.html             |    8 +-
 .../page-visibility-hidden-001-print-ref.html |    5 +
 ...-overflow-quirks-frameset-crash-print.html |   18 +
 .../selectors/parsing/invalid-pseudos.html    |    6 +
 ...ent-internals-aria-element-reflection.html |  172 ++
 .../ElementInternals-states.html              |    3 +
 .../wpt/tests/custom-elements/state/META.yml  |    1 +
 .../wpt/tests/custom-elements/state/README.md |    2 +
 .../state/custom-state-set-strong-ref.html}   |    2 +-
 .../state/state-css-selector-shadow-dom.html} |    2 +-
 .../state/state-css-selector.html}            |    2 +-
 .../{tentative => }/state-pseudo-class.html   |   26 +-
 .../custom-elements/state/tentative/README.md |    1 -
 .../tests/custom-state-pseudo-class/META.yml  |    1 -
 .../idlharness.window.js                      |   20 -
 .../scrollend-event-fired-to-window.html      |    4 +-
 ...crollend-event-not-fired-on-no-scroll.html |    6 +-
 .../dom/observable/tentative/idlharness.html  |   20 +
 .../tentative/observable-constructor.any.js   |  165 +-
 .../tentative/observable-takeUntil.any.js     |  324 +++
 .../tentative/observable-takeUntil.window.js  |   61 +
 tests/wpt/tests/editing/data/formatblock.js   |    6 +
 .../wpt/tests/editing/data/insertparagraph.js |  152 ++
 .../edit-context-basics.tentative.html        |   17 +
 tests/wpt/tests/editing/run/formatblock.html  |    3 +-
 .../tests/editing/run/insertparagraph.html    |    3 +-
 .../encoding/sharedarraybuffer.https.html     |    4 +-
 .../buffered-and-duration-threshold.html      |    4 +-
 .../wpt/tests/event-timing/click-timing.html  |   77 +-
 tests/wpt/tests/event-timing/crossiframe.html |   19 +-
 .../first-input-interactionid-tap.html        |    2 +
 .../resources/event-timing-test-utils.js      |   84 +-
 .../event-timing/shadow-dom-null-target.html  |    4 +-
 .../deprecated-config-apis.https.html         |    2 +-
 ...nced-frame-in-iframe-navigation.https.html |   75 +
 ...-nested-fenced-frame-navigation.https.html |   50 +
 .../resources/preflight.py                    |    3 +-
 .../generic-sensor/generic-sensor-tests.js    |   49 +-
 .../wpt/tests/html-aam/roles-contextual.html  |   33 +-
 .../order-in-bfcache-restore.html             |    0
 .../order-in-new-document-navigation.html     |    0
 .../order-in-prerender-activation.html        |    0
 .../order-in-prerender-activation-popup.html  |    0
 .../2d.layer.clearRect.full-expected.html     |   15 +
 .../layers/2d.layer.clearRect.full.html       |   23 +
 .../2d.layer.clearRect.partial-expected.html  |   21 +
 .../layers/2d.layer.clearRect.partial.html    |   22 +
 ....flush-on-frame-presentation-expected.html |    2 -
 .../layers/unclosed-layers-expected.html      |   11 +-
 .../manual/layers/unclosed-layers.html        |    5 +-
 .../unclosed-nested-layers-expected.html      |   15 +-
 .../manual/layers/unclosed-nested-layers.html |    5 +-
 ...h.stroke.prune.closePath.arc-expected.html |   25 -
 .../2d.path.stroke.prune.closePath.arc.html   |   35 -
 ....prune.closePath.bezierCurve-expected.html |   25 -
 ...th.stroke.prune.closePath.bezierCurve.html |   35 -
 ....stroke.prune.closePath.line-expected.html |   25 -
 .../2d.path.stroke.prune.closePath.line.html  |   35 -
 ...une.closePath.quadraticCurve-expected.html |   25 -
 ...stroke.prune.closePath.quadraticCurve.html |   35 -
 .../2d.layer.clearRect.full-expected.html     |   15 +
 .../layers/2d.layer.clearRect.full.html       |   26 +
 .../2d.layer.clearRect.full.w.html}           |   40 +-
 .../2d.layer.clearRect.partial-expected.html  |   21 +
 .../layers/2d.layer.clearRect.partial.html    |   25 +
 .../2d.layer.clearRect.partial.w.html}        |   39 +-
 .../layers/unclosed-layers-expected.html      |   12 +-
 .../manual/layers/unclosed-layers.html        |    5 +-
 .../manual/layers/unclosed-layers.w.html      |    5 +-
 .../unclosed-nested-layers-expected.html      |   15 +-
 .../manual/layers/unclosed-nested-layers.html |    5 +-
 .../layers/unclosed-nested-layers.w.html      |    5 +-
 ...h.stroke.prune.closePath.arc-expected.html |   25 -
 .../2d.path.stroke.prune.closePath.arc.html   |   38 -
 ....prune.closePath.bezierCurve-expected.html |   25 -
 ...th.stroke.prune.closePath.bezierCurve.html |   38 -
 ....stroke.prune.closePath.bezierCurve.w.html |   52 -
 ....stroke.prune.closePath.line-expected.html |   25 -
 .../2d.path.stroke.prune.closePath.line.html  |   38 -
 ...une.closePath.quadraticCurve-expected.html |   25 -
 ...stroke.prune.closePath.quadraticCurve.html |   38 -
 ...roke.prune.closePath.quadraticCurve.w.html |   52 -
 .../html/canvas/tools/yaml-new/layers.yaml    |   41 +-
 .../canvas/tools/yaml-new/path-objects.yaml   |  152 --
 .../html/dom/aria-element-reflection.html     |   23 +
 .../bidi-rendering/unicode-bidi-ua-rules.html |   25 +
 .../search-styles-iso-8859-8.html             |    2 +-
 .../select-parsing.tentative.html             |   63 +-
 ...trary-content-displayed-ref.tentative.html |    4 +-
 ...arget-button-event-dispatch.tentative.html |    3 +
 ...t-generic-eventtarget-crash.tentative.html |   18 +
 .../popovers/popover-attribute-basic.html     |    1 +
 ...er-top-layer-nesting-anchor.tentative.html |   45 +
 ...ver-top-layer-nesting-hints.tentative.html |   46 +
 .../popover-top-layer-nesting.tentative.html  |   45 +
 .../popovers/popovertarget-reflection.html    |   21 +
 .../resources/popover-top-layer-nesting.js    |  108 +
 .../support/svg-script-self-closing.js        |    1 +
 .../syntax/parsing/unclosed-svg-script.html   |    7 +
 .../tests/interfaces/observable.tentative.idl |   31 +
 tests/wpt/tests/lint.ignore                   |    1 +
 .../direction/direction-overall-002-ref.html  |   11 +
 .../direction/direction-overall-002.html      |  120 +
 .../direction/direction-overall-003-ref.html  |   38 +
 .../direction/direction-overall-003.html      |   94 +
 .../frac-created-dynamically-4-ref.html       |   20 +
 .../fractions/frac-created-dynamically-4.html |   34 +
 .../fractions/frac-linethickness-005-ref.html |   14 +
 .../fractions/frac-linethickness-005.html     |   24 +
 .../fractions/frac-linethickness-006-ref.html |   14 +
 .../fractions/frac-linethickness-006.html     |   24 +
 .../fractions/frac-linethickness-007-ref.html |   14 +
 .../fractions/frac-linethickness-007.html     |   24 +
 .../fractions/frac-linethickness-008-ref.html |   14 +
 .../fractions/frac-linethickness-008.html     |   24 +
 .../mo-invisibleoperators-2-ref.html          |   28 +
 .../operators/mo-invisibleoperators-2.html    |   48 +
 .../operators/mo-invisibleoperators-ref.html  |   13 +
 .../operators/mo-invisibleoperators.html      |   33 +
 .../mo-movablelimits-dynamic-ref.html         |   14 +-
 .../operators/mo-movablelimits-dynamic.html   |   32 +-
 .../munderover-accent-dynamic-001-ref.html    |   12 +
 .../munderover-accent-dynamic-001.html        |   22 +
 ...underover-accentunder-dynamic-001-ref.html |   12 +
 .../munderover-accentunder-dynamic-001.html   |   22 +
 .../spaces/space-3-ref.html                   |   27 +
 .../presentation-markup/spaces/space-3.html   |   21 +
 ...treamTrackProcessor-backpressure.worker.js |   56 +
 ...ackProcessor-with-window-tracks.https.html |   77 +
 .../MediaStreamTrackProcessor.worker.js       |   47 +
 ...ackGenerator-with-window-tracks.https.html |  280 ++
 .../VideoTrackGenerator.worker.js             |  233 ++
 ...MediaStreamTrackGenerator-audio.https.html |    0
 ...rackGenerator-in-service-worker.https.html |    0
 ...TrackGenerator-in-shared-worker.https.html |    0
 ...aStreamTrackGenerator-in-worker.https.html |    0
 ...kGenerator-pipes-data-in-worker.https.html |    0
 ...MediaStreamTrackGenerator-video.https.html |    0
 ...reamTrackProcessor-backpressure.https.html |    0
 ...MediaStreamTrackProcessor-video.https.html |    0
 .../MediaStreamTrackProcessor-worker.js       |   17 +
 .../{tentative => legacy}/dedicated-worker.js |    0
 .../{tentative => legacy}/service-worker.js   |    0
 .../{tentative => legacy}/shared-worker.js    |    0
 ...diaRecorder-canvas-media-source.https.html |   33 +-
 .../MediaRecorder-events-and-exceptions.html  |   16 +-
 .../MediaRecorder-mimetype.html               |    3 +
 .../MediaRecorder-pause-resume.html           |  127 +-
 .../MediaRecorder-start.html                  |    2 +-
 .../MediaRecorder-stop.html                   |   47 +-
 .../pointerevent_attributes.html              |   10 +-
 ...ents_after_removing_last_over_element.html |  149 ++
 .../pointerevents/pointerevent_support.js     |  130 +-
 .../class-names-across-iframes-ref.html       |    8 +
 .../quirks/class-names-across-iframes.html    |   28 +
 ...inting-video-with-range-request.https.html |   25 +-
 .../range-request-with-synth-head-worker.js   |   36 +
 .../static-router/resources/direct.css        |    3 +
 .../static-router/resources/direct.js         |    1 +
 .../static-router/resources/direct.py         |    7 +
 .../static-router/resources/imported-sw.js    |   13 +
 .../static-router/resources/router-rules.js   |   30 +-
 .../resources/static-router-helpers.sub.js    |    8 +
 ...outer-race-network-and-fetch-handler-sw.js |   57 +
 .../resources/static-router-sw.js             |    2 +
 .../resources/static-router-sw.sub.js         |    6 +-
 .../static-router-fetch-event.https.html      |   39 +
 .../static-router-main-resource.https.html    |   17 -
 ...r-multiple-router-registrations.https.html |   57 +
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 rename tests/wpt/tests/html/canvas/offscreen/{path-objects/2d.path.stroke.prune.closePath.line.w.html => layers/2d.layer.clearRect.full.w.html} (51%)
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 create mode 100644 tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html
 rename tests/wpt/tests/html/canvas/offscreen/{path-objects/2d.path.stroke.prune.closePath.arc.w.html => layers/2d.layer.clearRect.partial.w.html} (50%)
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc-expected.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line-expected.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html
 delete mode 100644 tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html
 create mode 100644 tests/wpt/tests/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/invoketarget-generic-eventtarget-crash.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-anchor.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-hints.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/popovertarget-reflection.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/resources/popover-top-layer-nesting.js
 create mode 100644 tests/wpt/tests/html/syntax/parsing/support/svg-script-self-closing.js
 create mode 100644 tests/wpt/tests/interfaces/observable.tentative.idl
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/spaces/space-3-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/spaces/space-3.html
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-backpressure.worker.js
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-with-window-tracks.https.html
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor.worker.js
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator-with-window-tracks.https.html
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator.worker.js
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-audio.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-in-service-worker.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-in-shared-worker.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-in-worker.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-pipes-data-in-worker.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackGenerator-video.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackProcessor-backpressure.https.html (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/MediaStreamTrackProcessor-video.https.html (100%)
 create mode 100644 tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-worker.js
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/dedicated-worker.js (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/service-worker.js (100%)
 rename tests/wpt/tests/mediacapture-insertable-streams/{tentative => legacy}/shared-worker.js (100%)
 create mode 100644 tests/wpt/tests/pointerevents/pointerevent_pointer_boundary_events_after_removing_last_over_element.html
 create mode 100644 tests/wpt/tests/quirks/class-names-across-iframes-ref.html
 create mode 100644 tests/wpt/tests/quirks/class-names-across-iframes.html
 create mode 100644 tests/wpt/tests/service-workers/service-worker/resources/range-request-with-synth-head-worker.js
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.css
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.js
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.py
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/imported-sw.js
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-race-network-and-fetch-handler-sw.js
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-fetch-event.https.html
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-multiple-router-registrations.https.html
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-race-network-and-fetch-handler.https.html
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-destination.https.html
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-method.https.html
 create mode 100644 tests/wpt/tests/shadow-dom/focus/text-selection-with-delegatesFocus.html
 delete mode 100644 tests/wpt/tests/soft-navigation-heuristics/softnav-painted-area-is-reset.tentative.html
 create mode 100644 tests/wpt/tests/svg/text/reftests/green-100x100.svg
 create mode 100644 tests/wpt/tests/svg/text/reftests/lengthAdjust-vertical.svg
 rename tests/wpt/tests/trusted-types/{TrustedTypePolicyFactory-blocking.html => TrustedTypePolicyFactory-blocking.tentative.html} (100%)
 create mode 100644 tests/wpt/tests/trusted-types/block-string-assignment-to-Document-parseHTMLUnsafe.html
 create mode 100644 tests/wpt/tests/trusted-types/block-string-assignment-to-Element-setHTMLUnsafe.html
 create mode 100644 tests/wpt/tests/trusted-types/block-string-assignment-to-ShadowRoot-setHTMLUnsafe.html
 create mode 100644 tests/wpt/tests/uievents/mouse/mouse_boundary_events_after_removing_last_over_element.html
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/conftest.py
 create mode 100644 tests/wpt/tests/webdriver/tests/support/html/beforeunload.html
 create mode 100644 tests/wpt/tests/webdriver/tests/support/html/default.html
 delete mode 100644 tests/wpt/tests/webrtc/RTCStats-helper.js
 create mode 100644 tests/wpt/tests/websockets/stream/tentative/websocket-error.any.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/first-party.all.tentative.https.window.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/first-party.default.tentative.https.window.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/first-party.none.tentative.https.window.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/resources/iframe-iframe.html
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/resources/iframe.sub.html
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/resources/worker.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/third-party.all.tentative.sub.https.window.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js
 create mode 100644 tests/wpt/tests/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js

diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/animations/background-color-transition-colormix.html.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/animations/background-color-transition-colormix.html.ini
new file mode 100644
index 00000000000..7a4ba8bfc1b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/animations/background-color-transition-colormix.html.ini
@@ -0,0 +1,3 @@
+[background-color-transition-colormix.html]
+  [Transition with currentColor in color-mix]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-color/system-color-support.html.ini b/tests/wpt/meta-legacy-layout/css/css-color/system-color-support.html.ini
index 28563ddd87a..5e4f61129f3 100644
--- a/tests/wpt/meta-legacy-layout/css/css-color/system-color-support.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-color/system-color-support.html.ini
@@ -55,3 +55,9 @@
 
   [System color AccentColorText works]
     expected: FAIL
+
+  [System color AppWorkspace works]
+    expected: FAIL
+
+  [System color Scrollbar works]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
index 2b2e0fce8eb..80111fb0236 100644
--- a/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
@@ -1,5 +1,4 @@
 [position-absolute-013.html]
-  expected: TIMEOUT
   [.flexbox 309]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/css/css-flexbox/align-content-wrap-003.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/align-content-wrap-003.html.ini
index 8ae79171efe..34b4dcc5189 100644
--- a/tests/wpt/meta-legacy-layout/css/css-flexbox/align-content-wrap-003.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-flexbox/align-content-wrap-003.html.ini
@@ -8,9 +8,6 @@
   [.flexbox 12]
     expected: FAIL
 
-  [.flexbox 13]
-    expected: FAIL
-
   [.flexbox 11]
     expected: FAIL
 
@@ -67,4 +64,3 @@
 
   [.flexbox 42]
     expected: FAIL
-
diff --git a/tests/wpt/meta-legacy-layout/css/css-flexbox/flexbox_justifycontent-spacearound-negative.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/flexbox_justifycontent-spacearound-negative.html.ini
new file mode 100644
index 00000000000..6dc942b83b9
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-flexbox/flexbox_justifycontent-spacearound-negative.html.ini
@@ -0,0 +1,2 @@
+[flexbox_justifycontent-spacearound-negative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-wrap-pretty.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-wrap-pretty.html.ini
new file mode 100644
index 00000000000..413577d3f79
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-wrap-pretty.html.ini
@@ -0,0 +1,42 @@
+[text-wrap-pretty.html]
+  [e.style['text-wrap'\] = "pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "wrap pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "pretty wrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "stable wrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "nowrap pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "pretty nowrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap-style'\] = "pretty" should set the property value]
+    expected: FAIL
+
+  [Property text-wrap value 'pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'wrap pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'pretty wrap']
+    expected: FAIL
+
+  [Property text-wrap value 'stable wrap']
+    expected: FAIL
+
+  [Property text-wrap value 'nowrap pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'pretty nowrap']
+    expected: FAIL
+
+  [Property text-wrap-style value 'pretty']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-computed.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-computed.tentative.html.ini
new file mode 100644
index 00000000000..7a52f8415e9
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-computed.tentative.html.ini
@@ -0,0 +1,6 @@
+[user-find-computed.tentative.html]
+  [Property user-find value 'auto']
+    expected: FAIL
+
+  [Property user-find value 'none']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-valid.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-valid.tentative.html.ini
new file mode 100644
index 00000000000..5484a92303f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/user-find-valid.tentative.html.ini
@@ -0,0 +1,6 @@
+[user-find-valid.tentative.html]
+  [e.style['user-find'\] = "auto" should set the property value]
+    expected: FAIL
+
+  [e.style['user-find'\] = "none" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/user-find.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/user-find.tentative.html.ini
new file mode 100644
index 00000000000..2455027f9c7
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/user-find.tentative.html.ini
@@ -0,0 +1,3 @@
+[user-find.tentative.html]
+  [Basic test for the user-find property]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/element-internals-aria-element-reflection.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/element-internals-aria-element-reflection.html.ini
new file mode 100644
index 00000000000..f8fa6c2292d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/element-internals-aria-element-reflection.html.ini
@@ -0,0 +1,2 @@
+[element-internals-aria-element-reflection.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/tentative/ElementInternals-states.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/ElementInternals-states.html.ini
similarity index 59%
rename from tests/wpt/meta-legacy-layout/custom-elements/state/tentative/ElementInternals-states.html.ini
rename to tests/wpt/meta-legacy-layout/custom-elements/state/ElementInternals-states.html.ini
index e40204e0de4..16a0c952b9b 100644
--- a/tests/wpt/meta-legacy-layout/custom-elements/state/tentative/ElementInternals-states.html.ini
+++ b/tests/wpt/meta-legacy-layout/custom-elements/state/ElementInternals-states.html.ini
@@ -1,22 +1,12 @@
 [ElementInternals-states.html]
-  [DOMTokenList behavior of ElementInternals.states: Initial state]
-    expected: FAIL
-
-  [DOMTokenList behavior of ElementInternals.states: Exceptions]
-    expected: FAIL
-
-  [DOMTokenList behavior of ElementInternals.states: Modifications]
+  [CustomStateSet behavior of ElementInternals.states: Initial state]
     expected: FAIL
 
   [CustomStateSet behavior of ElementInternals.states: Exceptions]
     expected: FAIL
 
-  [CustomStateSet behavior of ElementInternals.states: Initial state]
-    expected: FAIL
-
   [CustomStateSet behavior of ElementInternals.states: Modifications]
     expected: FAIL
 
   [Updating a CustomStateSet while iterating it should work]
     expected: FAIL
-
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/custom-state-set-strong-ref.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/custom-state-set-strong-ref.html.ini
new file mode 100644
index 00000000000..10637c9539a
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/state/custom-state-set-strong-ref.html.ini
@@ -0,0 +1,2 @@
+[custom-state-set-strong-ref.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector-shadow-dom.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector-shadow-dom.html.ini
new file mode 100644
index 00000000000..e94ccf81db4
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector-shadow-dom.html.ini
@@ -0,0 +1,2 @@
+[state-css-selector-shadow-dom.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector.html.ini
new file mode 100644
index 00000000000..80b61c3175f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/state/state-css-selector.html.ini
@@ -0,0 +1,2 @@
+[state-css-selector.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/state-pseudo-class.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/state-pseudo-class.html.ini
new file mode 100644
index 00000000000..cf2fce2458b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/state/state-pseudo-class.html.ini
@@ -0,0 +1,18 @@
+[state-pseudo-class.html]
+  [:state() parsing passes]
+    expected: FAIL
+
+  [:state(foo) serialization]
+    expected: FAIL
+
+  [:state(foo) in simple cases]
+    expected: FAIL
+
+  [:state(foo) and other pseudo classes]
+    expected: FAIL
+
+  [:state(foo) and ::part()]
+    expected: FAIL
+
+  [:state(foo) and :host()]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/state/tentative/state-pseudo-class.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/state/tentative/state-pseudo-class.html.ini
deleted file mode 100644
index b8cad742dc1..00000000000
--- a/tests/wpt/meta-legacy-layout/custom-elements/state/tentative/state-pseudo-class.html.ini
+++ /dev/null
@@ -1,51 +0,0 @@
-[state-pseudo-class.html]
-  [:state() and :host()]
-    expected: FAIL
-
-  [:state() and ::part()]
-    expected: FAIL
-
-  [:state() in simple cases]
-    expected: FAIL
-
-  [:state() and other pseudo classes]
-    expected: FAIL
-
-  [:state() serialization]
-    expected: FAIL
-
-  [:--foo in simple cases]
-    expected: FAIL
-
-  [:--foo serialization]
-    expected: FAIL
-
-  [:--foo parsing passes]
-    expected: FAIL
-
-  [:--foo and :host()]
-    expected: FAIL
-
-  [:--foo and other pseudo classes]
-    expected: FAIL
-
-  [:--foo and ::part()]
-    expected: FAIL
-
-  [:state() parsing passes]
-    expected: FAIL
-
-  [:state(foo) serialization]
-    expected: FAIL
-
-  [:state(foo) in simple cases]
-    expected: FAIL
-
-  [:state(foo) and other pseudo classes]
-    expected: FAIL
-
-  [:state(foo) and ::part()]
-    expected: FAIL
-
-  [:state(foo) and :host()]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/idlharness.html.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/idlharness.html.ini
new file mode 100644
index 00000000000..7963a3aae99
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/idlharness.html.ini
@@ -0,0 +1,102 @@
+[idlharness.html]
+  [Subscriber interface: existence and properties of interface object]
+    expected: FAIL
+
+  [Subscriber interface object length]
+    expected: FAIL
+
+  [Subscriber interface object name]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [Subscriber interface: operation next(any)]
+    expected: FAIL
+
+  [Subscriber interface: operation error(any)]
+    expected: FAIL
+
+  [Subscriber interface: operation complete()]
+    expected: FAIL
+
+  [Subscriber interface: operation addTeardown(VoidFunction)]
+    expected: FAIL
+
+  [Subscriber interface: attribute active]
+    expected: FAIL
+
+  [Subscriber interface: attribute signal]
+    expected: FAIL
+
+  [Subscriber must be primary interface of (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })()]
+    expected: FAIL
+
+  [Stringification of (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })()]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "next(any)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling next(any) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "error(any)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling error(any) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "complete()" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "addTeardown(VoidFunction)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling addTeardown(VoidFunction) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "active" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "signal" with the proper type]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface object]
+    expected: FAIL
+
+  [Observable interface object length]
+    expected: FAIL
+
+  [Observable interface object name]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [Observable interface: operation subscribe(optional ObserverUnion, optional SubscribeOptions)]
+    expected: FAIL
+
+  [Observable must be primary interface of new Observable(() => {})]
+    expected: FAIL
+
+  [Stringification of new Observable(() => {})]
+    expected: FAIL
+
+  [Observable interface: new Observable(() => {}) must inherit property "subscribe(optional ObserverUnion, optional SubscribeOptions)" with the proper type]
+    expected: FAIL
+
+  [Observable interface: calling subscribe(optional ObserverUnion, optional SubscribeOptions) on new Observable(() => {}) with too few arguments must throw TypeError]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini
index 6f86ee42541..e132211192b 100644
--- a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.any.js.ini
@@ -92,6 +92,21 @@
   [Subscribe with just a function as the next handler]
     expected: FAIL
 
+  [Subscriber must have receiver]
+    expected: FAIL
+
+  [Subscriber next & error must recieve argument]
+    expected: FAIL
+
+  [Subscriber complete() will set active to false, and abort signal]
+    expected: FAIL
+
+  [Subscriber active is readonly]
+    expected: FAIL
+
+  [Subscriber signal is readonly]
+    expected: FAIL
+
 
 [observable-constructor.any.html]
   [Observable constructor]
@@ -186,3 +201,18 @@
 
   [Subscribe with just a function as the next handler]
     expected: FAIL
+
+  [Subscriber must have receiver]
+    expected: FAIL
+
+  [Subscriber next & error must recieve argument]
+    expected: FAIL
+
+  [Subscriber complete() will set active to false, and abort signal]
+    expected: FAIL
+
+  [Subscriber active is readonly]
+    expected: FAIL
+
+  [Subscriber signal is readonly]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.any.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.any.js.ini
new file mode 100644
index 00000000000..e799d7864a3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.any.js.ini
@@ -0,0 +1,68 @@
+[observable-takeUntil.any.html]
+  [takeUntil subscribes to source Observable and mirrors it uninterrupted]
+    expected: FAIL
+
+  [takeUntil subscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier error() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil()'s AbortSignal unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits a value]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits error]
+    expected: FAIL
+
+  [takeUntil: source is uninterrupted when notifier completes, even synchronously]
+    expected: FAIL
+
+  [takeUntil() mirrors the source Observable until its first next() value]
+    expected: FAIL
+
+  [takeUntil: notifier calls `Subscriber#error()` twice; second goes to global error handler]
+    expected: FAIL
+
+
+[observable-takeUntil.any.worker.html]
+  [takeUntil subscribes to source Observable and mirrors it uninterrupted]
+    expected: FAIL
+
+  [takeUntil subscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier error() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil()'s AbortSignal unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits a value]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits error]
+    expected: FAIL
+
+  [takeUntil: source is uninterrupted when notifier completes, even synchronously]
+    expected: FAIL
+
+  [takeUntil() mirrors the source Observable until its first next() value]
+    expected: FAIL
+
+  [takeUntil: notifier calls `Subscriber#error()` twice; second goes to global error handler]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.window.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.window.js.ini
new file mode 100644
index 00000000000..99e9edce981
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-takeUntil.window.js.ini
@@ -0,0 +1,6 @@
+[observable-takeUntil.window.html]
+  [takeUntil(): notifier Observable detaches document before source Observable would be subscribed to]
+    expected: FAIL
+
+  [takeUntil(): Source and notifier internal observers do not crash in a detached document]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/private-network-access/worker-blob-fetch.tentative.window.js.ini b/tests/wpt/meta-legacy-layout/fetch/private-network-access/worker-blob-fetch.tentative.window.js.ini
index b1e3edb390c..2d0a05272ed 100644
--- a/tests/wpt/meta-legacy-layout/fetch/private-network-access/worker-blob-fetch.tentative.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/private-network-access/worker-blob-fetch.tentative.window.js.ini
@@ -34,3 +34,6 @@
 
   [private to private: success.]
     expected: FAIL
+
+  [local https to local https: success.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html.ini
rename to tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html.ini
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html.ini
rename to tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html.ini
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html.ini
rename to tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html.ini
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/srcdoc/consecutive-srcdoc.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/srcdoc/consecutive-srcdoc.html.ini
index eaebad750fe..f2dee7b3ea9 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/srcdoc/consecutive-srcdoc.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/history-traversal/srcdoc/consecutive-srcdoc.html.ini
@@ -1,7 +1,6 @@
 [consecutive-srcdoc.html]
-  expected: TIMEOUT
   [changing srcdoc does a replace navigation since the URL is still about:srcdoc]
     expected: FAIL
 
   [changing srcdoc to about:srcdoc#yo then another srcdoc does two push navigations and we can navigate back]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
deleted file mode 100644
index 3e07e6b7d1f..00000000000
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[empty-iframe-load-event.html]
-  [Check execution order from nested timeout]
-    expected: FAIL
-
-  [Check execution order on load handler]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
index f27acdd3b9d..8ae58f9f1e2 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
@@ -4,3 +4,18 @@
 
   [Test javascript URL string return values in direct and indirect (target) frame contexts. 9]
     expected: FAIL
+
+  [0041 set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [0080 00FF set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [0080 00FF 0100 set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [D83D DE0D set in href="" targeting a frame and clicked]
+    expected: FAIL
+
+  [DE0D 0041 set in href="" targeting a frame and clicked]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
new file mode 100644
index 00000000000..4ecd6d9f753
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.js.ini
@@ -0,0 +1,3 @@
+[navigation-unload-cross-origin.sub.window.html]
+  [Cross-origin navigation started from unload handler must be ignored]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
new file mode 100644
index 00000000000..7dc346632a4
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
@@ -0,0 +1,3 @@
+[navigation-unload-same-origin.window.html]
+  [Same-origin navigation started from unload handler must be ignored]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 4b4820d1729..00000000000
--- a/tests/wpt/meta-legacy-layout/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini
new file mode 100644
index 00000000000..cbb623ca93b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini
deleted file mode 100644
index 379119d7910..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[unclosed-nested-layers.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini
new file mode 100644
index 00000000000..82ed05cb0db
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.full.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini
new file mode 100644
index 00000000000..66e33c7369b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.full.w.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini
new file mode 100644
index 00000000000..cbb623ca93b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini
new file mode 100644
index 00000000000..acb8a58f63c
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.w.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini
deleted file mode 100644
index bd5646ca17c..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.arc.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini
deleted file mode 100644
index b16f7642c5b..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.bezierCurve.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini
deleted file mode 100644
index a1f8bf3ca80..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.line.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini
deleted file mode 100644
index 7ccc225dfa5..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.quadraticCurve.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini b/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
index 8b8af2b9c2e..2ef0896e3b3 100644
--- a/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
@@ -1,3 +1,4 @@
 [document-base-url-window-initiator-is-not-opener.https.window.html]
+  expected: TIMEOUT
   [window.open() gets base url from initiator not opener.]
     expected: [FAIL, PASS, TIMEOUT]
diff --git a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
index 9e6f4115b8c..0cfee719c4e 100644
--- a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html.ini
@@ -1,6 +1,7 @@
 [document-with-fragment-empty.html]
+  expected: TIMEOUT
   [Autofocus elements in iframed documents with empty fragments should work.]
     expected: FAIL
 
   [Autofocus elements in top-level browsing context's documents with empty fragments should work.]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini
new file mode 100644
index 00000000000..01f2382ec8e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini
@@ -0,0 +1,3 @@
+[unicode-bidi-ua-rules.html]
+  [UA stylesheet rule for unicode-bidi, for <search>]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index 26704422bbe..841bafc6eca 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
index 6fcdfb95246..fe55ddae3f1 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-3.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_escaping-3.html]
   type: testharness
-  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index f9138fb999a..6f7461b9472 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-1.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index 76e34322dca..6bec7a732b8 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,5 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
   type: testharness
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
deleted file mode 100644
index 7682a4830bf..00000000000
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[reparent-form-during-planned-navigation-task.html]
-  expected: TIMEOUT
-  [reparent-form-during-planned-navigation-task]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/historical.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/historical.html.ini
new file mode 100644
index 00000000000..5d8289307cc
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/historical.html.ini
@@ -0,0 +1,3 @@
+[historical.html]
+  [<input name=isindex> should not be supported]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
index b31f3485d6b..293eae69db5 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
@@ -16,3 +16,6 @@
 
   [<select> in <select><button><div> should remove inner <select>.]
     expected: FAIL
+
+  [Nested <button>s or <datalist>s in <select> should be dropped.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index 73807cb3cc1..cc18f512574 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,6 +1,5 @@
 [htmlanchorelement_noopener.html]
   type: testharness
-  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name ignores an existing window with that name]
     expected: NOTRUN
 
@@ -14,4 +13,4 @@
     expected: FAIL
 
   [Check that rel=noopener with target=_self does a normal load]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/popovers/popovertarget-reflection.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/popovers/popovertarget-reflection.html.ini
new file mode 100644
index 00000000000..b181bd6a9c8
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/popovers/popovertarget-reflection.html.ini
@@ -0,0 +1,3 @@
+[popovertarget-reflection.html]
+  [Element attribute reflection of popoverTargetElement/popovertarget should be kept in sync.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/syntax/parsing/DOMContentLoaded-defer.html.ini b/tests/wpt/meta-legacy-layout/html/syntax/parsing/DOMContentLoaded-defer.html.ini
deleted file mode 100644
index b8bdf33cb65..00000000000
--- a/tests/wpt/meta-legacy-layout/html/syntax/parsing/DOMContentLoaded-defer.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[DOMContentLoaded-defer.html]
-  [The end: DOMContentLoaded and defer scripts]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/syntax/parsing/unclosed-svg-script.html.ini b/tests/wpt/meta-legacy-layout/html/syntax/parsing/unclosed-svg-script.html.ini
index c892734bd40..78d56972597 100644
--- a/tests/wpt/meta-legacy-layout/html/syntax/parsing/unclosed-svg-script.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/syntax/parsing/unclosed-svg-script.html.ini
@@ -5,3 +5,5 @@
   [SVG scripts with bogus end tag inside should run]
     expected: FAIL
 
+  [SVG scripts with self-closing start tag should run]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
new file mode 100644
index 00000000000..fc0233f5241
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
@@ -0,0 +1,3 @@
+[module-delayed.html]
+  [async document.write in a module]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 7d4c3a1b06d..e55f8f2ce3c 100644
--- a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -5,4 +5,4 @@
     expected: TIMEOUT
 
   [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
index 7237f5792de..dbe1def99e3 100644
--- a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry-different-function-realm.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Thenable resolution]
     expected: FAIL
@@ -13,4 +12,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.html.ini b/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.html.ini
index 86a2572b9b8..12581463c49 100644
--- a/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.html.ini
+++ b/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.html.ini
@@ -68,3 +68,6 @@
 
   [PerformanceEntry has correct protocol attribute (xmlhttprequest)]
     expected: FAIL
+
+  [PerformanceEntry has correct name, initiatorType, startTime, and duration (img)]
+    expected: FAIL
diff --git a/tests/wpt/meta/webmessaging/without-ports/017.html.ini b/tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
similarity index 100%
rename from tests/wpt/meta/webmessaging/without-ports/017.html.ini
rename to tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
diff --git a/tests/wpt/meta-legacy-layout/websockets/stream/tentative/close.any.js.ini b/tests/wpt/meta-legacy-layout/websockets/stream/tentative/close.any.js.ini
index 9e2333a0259..7ff0acfd54c 100644
--- a/tests/wpt/meta-legacy-layout/websockets/stream/tentative/close.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/websockets/stream/tentative/close.any.js.ini
@@ -264,6 +264,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.worker.html?wss]
   [close code should be sent to server and reflected back]
@@ -350,6 +368,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.worker.html?wpt_flags=h2]
   [close code should be sent to server and reflected back]
@@ -436,6 +472,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.serviceworker.html?wss]
   expected: ERROR
@@ -530,3 +584,21 @@
 
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
+
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/websockets/stream/tentative/websocket-error.any.js.ini b/tests/wpt/meta-legacy-layout/websockets/stream/tentative/websocket-error.any.js.ini
new file mode 100644
index 00000000000..339ae1322bf
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/websockets/stream/tentative/websocket-error.any.js.ini
@@ -0,0 +1,68 @@
+[websocket-error.any.sharedworker.html]
+  expected: ERROR
+
+[websocket-error.any.serviceworker.html]
+  expected: ERROR
+
+[websocket-error.any.html]
+  [WebSocketError defaults should be correct]
+    expected: FAIL
+
+  [WebSocketError should be initialised from arguments]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 1001 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 2999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 5000 should throw]
+    expected: FAIL
+
+  [passing only close code to WebSocketError should work]
+    expected: FAIL
+
+  [passing a non-empty reason should cause the close code to be set to 1000]
+    expected: FAIL
+
+  [overlong reason should throw]
+    expected: FAIL
+
+  [reason should be rejected based on utf-8 bytes, not character count]
+    expected: FAIL
+
+
+[websocket-error.any.worker.html]
+  [WebSocketError defaults should be correct]
+    expected: FAIL
+
+  [WebSocketError should be initialised from arguments]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 1001 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 2999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 5000 should throw]
+    expected: FAIL
+
+  [passing only close code to WebSocketError should work]
+    expected: FAIL
+
+  [passing a non-empty reason should cause the close code to be set to 1000]
+    expected: FAIL
+
+  [overlong reason should throw]
+    expected: FAIL
+
+  [reason should be rejected based on utf-8 bytes, not character count]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini
new file mode 100644
index 00000000000..b8acd6da028
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.all.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option all for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini
new file mode 100644
index 00000000000..073d35de13a
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.default.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option default for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini
new file mode 100644
index 00000000000..85cd78c484b
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.none.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option none for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini
new file mode 100644
index 00000000000..eddd0aa6c39
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini
@@ -0,0 +1,3 @@
+[third-party.default.tentative.sub.https.window.html]
+  [Check SharedWorker sameSiteCookies option default for third-party]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini
new file mode 100644
index 00000000000..46f1697bd35
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini
@@ -0,0 +1,3 @@
+[third-party.none.tentative.sub.https.window.html]
+  [Check SharedWorker sameSiteCookies option none for third-party]
+    expected: FAIL
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index f9bda99b002..8854a4a3679 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -133,6 +133,13 @@
        {}
       ]
      ],
+     "aria-owns-presentation.html": [
+      "138625a1534faca65cb00ff3d615dc4fb3fc080b",
+      [
+       null,
+       {}
+      ]
+     ],
      "aria-owns-reparent.html": [
       "2eaceb66f6957b0240a4f02b0c23b74e8ca4921a",
       [
@@ -259,6 +266,13 @@
        {}
       ]
      ],
+     "illegal-aria-owns-from-br.html": [
+      "cb042b6f2bd0081f01be1040b9c2a94a4d2db148",
+      [
+       null,
+       {}
+      ]
+     ],
      "illegal-optgroup-structure.html": [
       "809f94261344a554dcef651c0315540eba6b4dcc",
       [
@@ -418,6 +432,29 @@
    "css": {
     "CSS2": {
      "floats": {
+      "crashtests": {
+       "float-rewind-parallel-flow-1-crash.html": [
+        "79d90b89b6523ccb64502d1b43b6b0a054148cd1",
+        [
+         null,
+         {}
+        ]
+       ],
+       "float-rewind-parallel-flow-2-crash.html": [
+        "c0c4daba84c79bfc1f0be3808c1a34b1fb472a38",
+        [
+         null,
+         {}
+        ]
+       ],
+       "float-rewind-parallel-flow-3-crash.html": [
+        "30e8d0dcfb9a31253ffd269e81976b6e1a5b3e6e",
+        [
+         null,
+         {}
+        ]
+       ]
+      },
       "floats-saturated-position-crash.html": [
        "08a400df569c2f42670de1963724d0e028bac150",
        [
@@ -2032,6 +2069,13 @@
      }
     },
     "css-display": {
+     "display-contents-001-crash.html": [
+      "376c3b549aad11dea1b144c989a69418c575a51f",
+      [
+       null,
+       {}
+      ]
+     ],
      "display-none-root-hit-test-crash.html": [
       "b2467fa58fdb965f4097c447ce8a93391d80ef7d",
       [
@@ -6638,6 +6682,15 @@
        ]
       }
      },
+     "invokers": {
+      "invoketarget-generic-eventtarget-crash.tentative.html": [
+       "b2179640ddfb5a2d3a531327cf9419f54d771aba",
+       [
+        null,
+        {}
+       ]
+      ]
+     },
      "popovers": {
       "invoker-show-crash.html": [
        "7da57f9788f07c57c7e6d2c2a5d4cee94c7a3ee6",
@@ -32776,6 +32829,19 @@
        }
       ]
      ],
+     "table-overflow-quirks-frameset-crash-print.html": [
+      "a79b8149011b3eb3873dbcfb5d27434c25015109",
+      [
+       null,
+       [
+        [
+         "/css/reference/blank.html",
+         "!="
+        ]
+       ],
+       {}
+      ]
+     ],
      "transform-001-print.html": [
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+      "762d924eb92c03380252b62db29fbdb0f3f33e0d",
+      [
+       "workers/same-site-cookies/first-party.none.tentative.https.window.html",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/resources/testdriver-vendor.js"
+         ]
+        ]
+       }
+      ]
+     ],
+     "third-party.all.tentative.sub.https.window.js": [
+      "51ad1d3b02543baa10ba62e4ab9e0e8b7afb7230",
+      [
+       "workers/same-site-cookies/third-party.all.tentative.sub.https.window.html",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/resources/testdriver-vendor.js"
+         ]
+        ]
+       }
+      ]
+     ],
+     "third-party.default.tentative.sub.https.window.js": [
+      "194df38390ed40e8127aede98b507bdd92da048a",
+      [
+       "workers/same-site-cookies/third-party.default.tentative.sub.https.window.html",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/resources/testdriver-vendor.js"
+         ]
+        ]
+       }
+      ]
+     ],
+     "third-party.none.tentative.sub.https.window.js": [
+      "b91b9d7ab27ce80b94db4dd8a51866b1e843ea7f",
+      [
+       "workers/same-site-cookies/third-party.none.tentative.sub.https.window.html",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/resources/testdriver-vendor.js"
+         ]
+        ]
+       }
+      ]
+     ]
+    },
     "semantics": {
      "encodings": {
       "001.html": [
@@ -805256,7 +806549,7 @@
       "browser": {
        "create_user_context": {
         "create_user_context.py": [
-         "d62be414605f454a745b76c3f1e06cc2ae1d74c7",
+         "f495498d0722131b728e1fb2c3fcb96afeb26b67",
          [
           null,
           {}
@@ -805377,7 +806670,7 @@
        },
        "context_created": {
         "context_created.py": [
-         "9b0926c09752a1c4f1a417d1a0ac2ae2e6fe7925",
+         "dda9b2dae0e4b2165ced50dd75bf8c693c6f081c",
          [
           null,
           {}
@@ -805386,7 +806679,7 @@
        },
        "context_destroyed": {
         "context_destroyed.py": [
-         "0dad8bc21d4eaf8aba1225a1688041792a7f9e1b",
+         "1e918713779adca821b277162ace6875730e3f71",
          [
           null,
           {}
@@ -805457,7 +806750,7 @@
        },
        "get_tree": {
         "frames.py": [
-         "b1936d31d0b7a5e3c27ce1a4193f3f8e3a63811c",
+         "fae7f00a05c6ada139f63666f7c04146b95cbbe8",
          [
           null,
           {}
@@ -805768,21 +807061,21 @@
        },
        "traverse_history": {
         "context.py": [
-         "7635c0e9ddd8a4413cc5aeb8af4ff4bbe5ae574a",
+         "2635dcfa287218dc1afabeea5c8186d3a1ee4109",
          [
           null,
           {}
          ]
         ],
         "delta.py": [
-         "05f4d99544fc850d8a9a325fe2e0eed49dbdf768",
+         "3bd0087250c14bd08bd22227046ac7ceb0a2a77f",
          [
           null,
           {}
          ]
         ],
         "invalid.py": [
-         "abb0d69c937d0a052f95431a674a3cfc45914a29",
+         "c6a90601e70da8af00723daa2924914969c5cea5",
          [
           null,
           {}
@@ -806809,14 +808102,14 @@
       },
       "back": {
        "back.py": [
-        "dfd194523138f3ed6378eda9634afdb423977c28",
+        "bfc5e0f4a398ec097896cfc955f0f5efdf317bfc",
         [
          null,
          {}
         ]
        ],
        "user_prompts.py": [
-        "9d04f0f4ab12d98f0313639013fce4f26869a753",
+        "1020a6aaa613889c3e032510e9eb21b76ca13f1c",
         [
          null,
          {
@@ -806834,7 +808127,7 @@
         ]
        ],
        "user_prompts.py": [
-        "c0f9cc7610c21ea97064392eb2e09fce6f853bbc",
+        "37928f97589dee7f966824103b1396f16c8b5f5a",
         [
          null,
          {
@@ -806987,7 +808280,7 @@
         ]
        ],
        "user_prompts.py": [
-        "140aceb3cedfe84ec8f9a3ac0285497b6e670285",
+        "a4c62cbca7784fe8303dad8f5f78d2a72a404aa6",
         [
          null,
          {
@@ -807114,7 +808407,7 @@
         ]
        ],
        "user_prompts.py": [
-        "e39574fd4ac1b734006614c4ab6caf0a9542676b",
+        "5243b372e5a5ca81f17b741ab73639be64e68e3e",
         [
          null,
          {
@@ -807188,7 +808481,7 @@
         ]
        ],
        "user_prompts.py": [
-        "48d735ea754c0f74726d5a89f43eabb245b8bc5a",
+        "74d4c47fc064f7b498def6a838ce36d3d5604ccf",
         [
          null,
          {
@@ -807314,14 +808607,14 @@
       },
       "forward": {
        "forward.py": [
-        "6774e522105d3aac24d9594af9ffb1b724aff00d",
+        "8bc75a07c0e61f95802a27b70d4a56ea6f0300a5",
         [
          null,
          {}
         ]
        ],
        "user_prompts.py": [
-        "3eeaf6e71cdb7311614b271257f4cd6d19a2e619",
+        "dfcba6469d5e6b7101976faa9a836733f13ec710",
         [
          null,
          {
@@ -807377,7 +808670,7 @@
       },
       "get_alert_text": {
        "get.py": [
-        "7ee7ff1808f928e67ab0e3423c13a885e28db08f",
+        "e8d0aa04e61d9d5a483702a5cef56a34be9dc641",
         [
          null,
          {}
@@ -807803,7 +809096,7 @@
         ]
        ],
        "user_prompts.py": [
-        "682bc40f4fe9d4b530b406a74b1451bbf88a5d75",
+        "db8d094ebbdf556167544b98110e7dd4ac0492c2",
         [
          null,
          {
@@ -808061,7 +809354,7 @@
         ]
        ],
        "user_prompts.py": [
-        "872325bb313dc92359bfaf813f84ac14cfd3a943",
+        "7fcd720624b1006cb1b5ff43305c79e00279ce0d",
         [
          null,
          {
@@ -808122,14 +809415,14 @@
       },
       "refresh": {
        "refresh.py": [
-        "19490a0a458c510a3c0f263d9f233b232e198c30",
+        "3f434a3012fe18ff8939fe5bc68579932ae14f4d",
         [
          null,
          {}
         ]
        ],
        "user_prompts.py": [
-        "7e944b53b0964e68b897e6315faa0cfa65802143",
+        "5787533b5727f05370bc3f9257c7723b12a1c0d3",
         [
          null,
          {
diff --git a/tests/wpt/meta/css/css-backgrounds/animations/background-color-transition-colormix.html.ini b/tests/wpt/meta/css/css-backgrounds/animations/background-color-transition-colormix.html.ini
new file mode 100644
index 00000000000..7a4ba8bfc1b
--- /dev/null
+++ b/tests/wpt/meta/css/css-backgrounds/animations/background-color-transition-colormix.html.ini
@@ -0,0 +1,3 @@
+[background-color-transition-colormix.html]
+  [Transition with currentColor in color-mix]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/system-color-support.html.ini b/tests/wpt/meta/css/css-color/system-color-support.html.ini
index 28563ddd87a..5e4f61129f3 100644
--- a/tests/wpt/meta/css/css-color/system-color-support.html.ini
+++ b/tests/wpt/meta/css/css-color/system-color-support.html.ini
@@ -55,3 +55,9 @@
 
   [System color AccentColorText works]
     expected: FAIL
+
+  [System color AppWorkspace works]
+    expected: FAIL
+
+  [System color Scrollbar works]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-flexbox/align-content-wrap-003.html.ini b/tests/wpt/meta/css/css-flexbox/align-content-wrap-003.html.ini
index d28d10da3d9..c3076b03f43 100644
--- a/tests/wpt/meta/css/css-flexbox/align-content-wrap-003.html.ini
+++ b/tests/wpt/meta/css/css-flexbox/align-content-wrap-003.html.ini
@@ -14,9 +14,6 @@
   [.flexbox 12]
     expected: FAIL
 
-  [.flexbox 13]
-    expected: FAIL
-
   [.flexbox 11]
     expected: FAIL
 
diff --git a/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini b/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
index 2f8155c3adb..1a23521baff 100644
--- a/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
+++ b/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
@@ -74,9 +74,6 @@
   [Matching font-style: 'oblique 21deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
     expected: FAIL
 
-  [Matching font-weight: '500' should prefer '450 460' over '400']
-    expected: FAIL
-
   [Matching font-weight: '399' should prefer '350 399' over '340 360']
     expected: FAIL
 
@@ -86,9 +83,6 @@
   [Matching font-stretch: '90%' should prefer '50% 80%' over '60% 70%']
     expected: FAIL
 
-  [Matching font-style: 'italic' should prefer 'oblique 5deg' over 'normal']
-    expected: FAIL
-
   [Matching font-weight: '500' should prefer '350 399' over '351 398']
     expected: FAIL
 
@@ -110,9 +104,6 @@
   [Matching font-style: 'normal' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
     expected: FAIL
 
-  [Matching font-style: 'italic' should prefer 'oblique 40deg 50deg' over 'oblique 5deg 10deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 20deg' should prefer 'italic' over 'oblique 0deg']
     expected: FAIL
 
@@ -125,9 +116,6 @@
   [Matching font-weight: '430' should prefer '450 460' over '500']
     expected: FAIL
 
-  [Matching font-weight: '430' should prefer '501 550' over '502 560']
-    expected: FAIL
-
   [Matching font-stretch: '90%' should prefer '110% 140%' over '120% 130%']
     expected: FAIL
 
@@ -233,9 +221,6 @@
   [Matching font-style: 'oblique 21deg' should prefer 'oblique 20deg' over 'oblique 10deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 0deg' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -10deg' should prefer 'oblique -5deg' over 'oblique -1deg 0deg']
     expected: FAIL
 
@@ -260,33 +245,15 @@
   [Matching font-style: 'oblique 0deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
     expected: FAIL
 
-  [Matching font-weight: '400' should prefer '351 398' over '501 550']
-    expected: FAIL
-
-  [Matching font-weight: '500' should prefer '500' over '450 460']
-    expected: FAIL
-
-  [Matching font-weight: '500' should prefer '400' over '350 399']
-    expected: FAIL
-
-  [Matching font-stretch: '100%' should prefer '100%' over '110% 120%']
-    expected: FAIL
-
   [Matching font-stretch: '110%' should prefer '105%' over '100%']
     expected: FAIL
 
-  [Matching font-style: 'normal' should prefer 'oblique 20deg 30deg' over 'oblique -50deg -20deg']
-    expected: FAIL
-
   [Matching font-style: 'italic' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
     expected: FAIL
 
   [Matching font-style: 'oblique 10deg' should prefer 'oblique 10deg' over 'oblique 5deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -10deg' should prefer 'oblique -50deg -40deg' over 'italic']
-    expected: FAIL
-
   [Matching font-style: 'oblique -20deg' should prefer 'oblique -20deg' over 'oblique -60deg -40deg']
     expected: FAIL
 
@@ -296,14 +263,26 @@
   [Matching font-stretch: '100%' should prefer '110% 120%' over '115% 116%']
     expected: FAIL
 
-  [Matching font-style: 'normal' should prefer 'oblique 10deg 40deg' over 'oblique 20deg 30deg']
-    expected: FAIL
-
   [Matching font-style: 'italic' should prefer 'italic' over 'oblique 20deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 10deg' should prefer 'italic' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -21deg' should prefer 'oblique -10deg' over 'italic']
     expected: FAIL
+
+  [Matching font-weight: '430' should prefer '340 398' over '501 550']
+    expected: FAIL
+
+  [Matching font-weight: '501' should prefer '502 510' over '503 520']
+    expected: FAIL
+
+  [Matching font-weight: '399' should prefer '400' over '450 460']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 20deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'oblique 5deg' over 'oblique 15deg 20deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -20deg' should prefer 'oblique 0deg' over 'oblique 30deg 60deg']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-tables/table-cell-scroll-height.html.ini b/tests/wpt/meta/css/css-tables/table-cell-scroll-height.html.ini
new file mode 100644
index 00000000000..343fc4d9bad
--- /dev/null
+++ b/tests/wpt/meta/css/css-tables/table-cell-scroll-height.html.ini
@@ -0,0 +1,3 @@
+[table-cell-scroll-height.html]
+  [scrollHeight on scrollable table cell]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/parsing/text-wrap-pretty.html.ini b/tests/wpt/meta/css/css-text/parsing/text-wrap-pretty.html.ini
new file mode 100644
index 00000000000..413577d3f79
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/parsing/text-wrap-pretty.html.ini
@@ -0,0 +1,42 @@
+[text-wrap-pretty.html]
+  [e.style['text-wrap'\] = "pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "wrap pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "pretty wrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "stable wrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "nowrap pretty" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap'\] = "pretty nowrap" should set the property value]
+    expected: FAIL
+
+  [e.style['text-wrap-style'\] = "pretty" should set the property value]
+    expected: FAIL
+
+  [Property text-wrap value 'pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'wrap pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'pretty wrap']
+    expected: FAIL
+
+  [Property text-wrap value 'stable wrap']
+    expected: FAIL
+
+  [Property text-wrap value 'nowrap pretty']
+    expected: FAIL
+
+  [Property text-wrap value 'pretty nowrap']
+    expected: FAIL
+
+  [Property text-wrap-style value 'pretty']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/user-find-computed.tentative.html.ini b/tests/wpt/meta/css/css-ui/parsing/user-find-computed.tentative.html.ini
new file mode 100644
index 00000000000..7a52f8415e9
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/parsing/user-find-computed.tentative.html.ini
@@ -0,0 +1,6 @@
+[user-find-computed.tentative.html]
+  [Property user-find value 'auto']
+    expected: FAIL
+
+  [Property user-find value 'none']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/user-find-valid.tentative.html.ini b/tests/wpt/meta/css/css-ui/parsing/user-find-valid.tentative.html.ini
new file mode 100644
index 00000000000..5484a92303f
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/parsing/user-find-valid.tentative.html.ini
@@ -0,0 +1,6 @@
+[user-find-valid.tentative.html]
+  [e.style['user-find'\] = "auto" should set the property value]
+    expected: FAIL
+
+  [e.style['user-find'\] = "none" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/user-find.tentative.html.ini b/tests/wpt/meta/css/css-ui/user-find.tentative.html.ini
new file mode 100644
index 00000000000..2455027f9c7
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/user-find.tentative.html.ini
@@ -0,0 +1,3 @@
+[user-find.tentative.html]
+  [Basic test for the user-find property]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini b/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
index 037d7e0f951..ee625a151a4 100644
--- a/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
+++ b/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-handleEvent.html.ini
@@ -4,3 +4,6 @@
 
   [throws if handleEvent is thruthy and not callable]
     expected: FAIL
+
+  [looks up handleEvent method on every event dispatch]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index 314dca9c1f5..d52a3e77a70 100644
--- a/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/meta/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
@@ -1,3 +1,6 @@
 [MediaQueryList-addListener-removeListener.html]
   [listeners are called when <iframe> is resized]
     expected: FAIL
+
+  [listeners are called correct number of times]
+    expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/element-internals-aria-element-reflection.html.ini b/tests/wpt/meta/custom-elements/element-internals-aria-element-reflection.html.ini
new file mode 100644
index 00000000000..f8fa6c2292d
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/element-internals-aria-element-reflection.html.ini
@@ -0,0 +1,2 @@
+[element-internals-aria-element-reflection.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/custom-elements/state/tentative/ElementInternals-states.html.ini b/tests/wpt/meta/custom-elements/state/ElementInternals-states.html.ini
similarity index 59%
rename from tests/wpt/meta/custom-elements/state/tentative/ElementInternals-states.html.ini
rename to tests/wpt/meta/custom-elements/state/ElementInternals-states.html.ini
index e40204e0de4..16a0c952b9b 100644
--- a/tests/wpt/meta/custom-elements/state/tentative/ElementInternals-states.html.ini
+++ b/tests/wpt/meta/custom-elements/state/ElementInternals-states.html.ini
@@ -1,22 +1,12 @@
 [ElementInternals-states.html]
-  [DOMTokenList behavior of ElementInternals.states: Initial state]
-    expected: FAIL
-
-  [DOMTokenList behavior of ElementInternals.states: Exceptions]
-    expected: FAIL
-
-  [DOMTokenList behavior of ElementInternals.states: Modifications]
+  [CustomStateSet behavior of ElementInternals.states: Initial state]
     expected: FAIL
 
   [CustomStateSet behavior of ElementInternals.states: Exceptions]
     expected: FAIL
 
-  [CustomStateSet behavior of ElementInternals.states: Initial state]
-    expected: FAIL
-
   [CustomStateSet behavior of ElementInternals.states: Modifications]
     expected: FAIL
 
   [Updating a CustomStateSet while iterating it should work]
     expected: FAIL
-
diff --git a/tests/wpt/meta/custom-elements/state/custom-state-set-strong-ref.html.ini b/tests/wpt/meta/custom-elements/state/custom-state-set-strong-ref.html.ini
new file mode 100644
index 00000000000..10637c9539a
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/state/custom-state-set-strong-ref.html.ini
@@ -0,0 +1,2 @@
+[custom-state-set-strong-ref.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/custom-elements/state/state-css-selector-shadow-dom.html.ini b/tests/wpt/meta/custom-elements/state/state-css-selector-shadow-dom.html.ini
new file mode 100644
index 00000000000..e94ccf81db4
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/state/state-css-selector-shadow-dom.html.ini
@@ -0,0 +1,2 @@
+[state-css-selector-shadow-dom.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/custom-elements/state/state-css-selector.html.ini b/tests/wpt/meta/custom-elements/state/state-css-selector.html.ini
new file mode 100644
index 00000000000..80b61c3175f
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/state/state-css-selector.html.ini
@@ -0,0 +1,2 @@
+[state-css-selector.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/custom-elements/state/state-pseudo-class.html.ini b/tests/wpt/meta/custom-elements/state/state-pseudo-class.html.ini
new file mode 100644
index 00000000000..cf2fce2458b
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/state/state-pseudo-class.html.ini
@@ -0,0 +1,18 @@
+[state-pseudo-class.html]
+  [:state() parsing passes]
+    expected: FAIL
+
+  [:state(foo) serialization]
+    expected: FAIL
+
+  [:state(foo) in simple cases]
+    expected: FAIL
+
+  [:state(foo) and other pseudo classes]
+    expected: FAIL
+
+  [:state(foo) and ::part()]
+    expected: FAIL
+
+  [:state(foo) and :host()]
+    expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/state/tentative/state-pseudo-class.html.ini b/tests/wpt/meta/custom-elements/state/tentative/state-pseudo-class.html.ini
deleted file mode 100644
index b8cad742dc1..00000000000
--- a/tests/wpt/meta/custom-elements/state/tentative/state-pseudo-class.html.ini
+++ /dev/null
@@ -1,51 +0,0 @@
-[state-pseudo-class.html]
-  [:state() and :host()]
-    expected: FAIL
-
-  [:state() and ::part()]
-    expected: FAIL
-
-  [:state() in simple cases]
-    expected: FAIL
-
-  [:state() and other pseudo classes]
-    expected: FAIL
-
-  [:state() serialization]
-    expected: FAIL
-
-  [:--foo in simple cases]
-    expected: FAIL
-
-  [:--foo serialization]
-    expected: FAIL
-
-  [:--foo parsing passes]
-    expected: FAIL
-
-  [:--foo and :host()]
-    expected: FAIL
-
-  [:--foo and other pseudo classes]
-    expected: FAIL
-
-  [:--foo and ::part()]
-    expected: FAIL
-
-  [:state() parsing passes]
-    expected: FAIL
-
-  [:state(foo) serialization]
-    expected: FAIL
-
-  [:state(foo) in simple cases]
-    expected: FAIL
-
-  [:state(foo) and other pseudo classes]
-    expected: FAIL
-
-  [:state(foo) and ::part()]
-    expected: FAIL
-
-  [:state(foo) and :host()]
-    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/idlharness.html.ini b/tests/wpt/meta/dom/observable/tentative/idlharness.html.ini
new file mode 100644
index 00000000000..7963a3aae99
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/idlharness.html.ini
@@ -0,0 +1,102 @@
+[idlharness.html]
+  [Subscriber interface: existence and properties of interface object]
+    expected: FAIL
+
+  [Subscriber interface object length]
+    expected: FAIL
+
+  [Subscriber interface object name]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [Subscriber interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [Subscriber interface: operation next(any)]
+    expected: FAIL
+
+  [Subscriber interface: operation error(any)]
+    expected: FAIL
+
+  [Subscriber interface: operation complete()]
+    expected: FAIL
+
+  [Subscriber interface: operation addTeardown(VoidFunction)]
+    expected: FAIL
+
+  [Subscriber interface: attribute active]
+    expected: FAIL
+
+  [Subscriber interface: attribute signal]
+    expected: FAIL
+
+  [Subscriber must be primary interface of (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })()]
+    expected: FAIL
+
+  [Stringification of (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })()]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "next(any)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling next(any) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "error(any)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling error(any) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "complete()" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "addTeardown(VoidFunction)" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: calling addTeardown(VoidFunction) on (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "active" with the proper type]
+    expected: FAIL
+
+  [Subscriber interface: (() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })() must inherit property "signal" with the proper type]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface object]
+    expected: FAIL
+
+  [Observable interface object length]
+    expected: FAIL
+
+  [Observable interface object name]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [Observable interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [Observable interface: operation subscribe(optional ObserverUnion, optional SubscribeOptions)]
+    expected: FAIL
+
+  [Observable must be primary interface of new Observable(() => {})]
+    expected: FAIL
+
+  [Stringification of new Observable(() => {})]
+    expected: FAIL
+
+  [Observable interface: new Observable(() => {}) must inherit property "subscribe(optional ObserverUnion, optional SubscribeOptions)" with the proper type]
+    expected: FAIL
+
+  [Observable interface: calling subscribe(optional ObserverUnion, optional SubscribeOptions) on new Observable(() => {}) with too few arguments must throw TypeError]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini
index 6f86ee42541..e132211192b 100644
--- a/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini
+++ b/tests/wpt/meta/dom/observable/tentative/observable-constructor.any.js.ini
@@ -92,6 +92,21 @@
   [Subscribe with just a function as the next handler]
     expected: FAIL
 
+  [Subscriber must have receiver]
+    expected: FAIL
+
+  [Subscriber next & error must recieve argument]
+    expected: FAIL
+
+  [Subscriber complete() will set active to false, and abort signal]
+    expected: FAIL
+
+  [Subscriber active is readonly]
+    expected: FAIL
+
+  [Subscriber signal is readonly]
+    expected: FAIL
+
 
 [observable-constructor.any.html]
   [Observable constructor]
@@ -186,3 +201,18 @@
 
   [Subscribe with just a function as the next handler]
     expected: FAIL
+
+  [Subscriber must have receiver]
+    expected: FAIL
+
+  [Subscriber next & error must recieve argument]
+    expected: FAIL
+
+  [Subscriber complete() will set active to false, and abort signal]
+    expected: FAIL
+
+  [Subscriber active is readonly]
+    expected: FAIL
+
+  [Subscriber signal is readonly]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.any.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.any.js.ini
new file mode 100644
index 00000000000..e799d7864a3
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.any.js.ini
@@ -0,0 +1,68 @@
+[observable-takeUntil.any.html]
+  [takeUntil subscribes to source Observable and mirrors it uninterrupted]
+    expected: FAIL
+
+  [takeUntil subscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier error() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil()'s AbortSignal unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits a value]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits error]
+    expected: FAIL
+
+  [takeUntil: source is uninterrupted when notifier completes, even synchronously]
+    expected: FAIL
+
+  [takeUntil() mirrors the source Observable until its first next() value]
+    expected: FAIL
+
+  [takeUntil: notifier calls `Subscriber#error()` twice; second goes to global error handler]
+    expected: FAIL
+
+
+[observable-takeUntil.any.worker.html]
+  [takeUntil subscribes to source Observable and mirrors it uninterrupted]
+    expected: FAIL
+
+  [takeUntil subscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier error() unsubscribes to notifier]
+    expected: FAIL
+
+  [takeUntil: notifier next() unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil()'s AbortSignal unsubscribes from notifier & source observable]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits a value]
+    expected: FAIL
+
+  [takeUntil: source never subscribed to when notifier synchronously emits error]
+    expected: FAIL
+
+  [takeUntil: source is uninterrupted when notifier completes, even synchronously]
+    expected: FAIL
+
+  [takeUntil() mirrors the source Observable until its first next() value]
+    expected: FAIL
+
+  [takeUntil: notifier calls `Subscriber#error()` twice; second goes to global error handler]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.window.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.window.js.ini
new file mode 100644
index 00000000000..99e9edce981
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-takeUntil.window.js.ini
@@ -0,0 +1,6 @@
+[observable-takeUntil.window.html]
+  [takeUntil(): notifier Observable detaches document before source Observable would be subscribed to]
+    expected: FAIL
+
+  [takeUntil(): Source and notifier internal observers do not crash in a detached document]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/metadata/generated/element-img-environment-change.sub.html.ini b/tests/wpt/meta/fetch/metadata/generated/element-img-environment-change.sub.html.ini
index 410ec4c1d39..cc2c0a353cd 100644
--- a/tests/wpt/meta/fetch/metadata/generated/element-img-environment-change.sub.html.ini
+++ b/tests/wpt/meta/fetch/metadata/generated/element-img-environment-change.sub.html.ini
@@ -1,13 +1,13 @@
 [element-img-environment-change.sub.html]
   expected: TIMEOUT
   [sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes]
-    expected: TIMEOUT
+    expected: FAIL
 
   [sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes]
-    expected: NOTRUN
+    expected: FAIL
 
   [sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes]
-    expected: NOTRUN
+    expected: TIMEOUT
 
   [sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes]
     expected: NOTRUN
@@ -41,3 +41,6 @@
 
   [sec-fetch-site - HTTPS downgrade-upgrade, no attributes]
     expected: NOTRUN
+
+  [sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html.ini
similarity index 100%
rename from tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html.ini
rename to tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html.ini
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html.ini
similarity index 100%
rename from tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html.ini
rename to tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html.ini
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html.ini
similarity index 100%
rename from tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html.ini
rename to tests/wpt/meta/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html.ini
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
index 51fd557bd7f..149bcb4ff8c 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
@@ -7,3 +7,6 @@
 
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank#foo']
     expected: FAIL
+
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
index 24d2f8ac554..27889a98fb5 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
@@ -1,3 +1,6 @@
 [navigate-to-unparseable-url.html]
   [location.href setter throws a SyntaxError DOMException for unparseable URLs]
     expected: FAIL
+
+  [<a> tag navigate fails for unparseable URLs]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini
new file mode 100644
index 00000000000..d993e8dcc42
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/read-media/pageload-image-in-popup.html.ini
@@ -0,0 +1,3 @@
+[pageload-image-in-popup.html]
+  [The document for a standalone media file should have one child in the body.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
new file mode 100644
index 00000000000..5d17a8e9419
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
@@ -0,0 +1,3 @@
+[traverse_the_history_2.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
new file mode 100644
index 00000000000..d6188c03424
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_4.html.ini
@@ -0,0 +1,3 @@
+[traverse_the_history_4.html]
+  [Multiple history traversals, last would be aborted]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini b/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
deleted file mode 100644
index 4b4820d1729..00000000000
--- a/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[creating_browsing_context_test_01.html]
-  [first argument: absolute url]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini b/tests/wpt/meta/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini
new file mode 100644
index 00000000000..cbb623ca93b
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/layers/2d.layer.clearRect.partial.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini b/tests/wpt/meta/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini
deleted file mode 100644
index 379119d7910..00000000000
--- a/tests/wpt/meta/html/canvas/element/manual/layers/unclosed-nested-layers.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[unclosed-nested-layers.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini
new file mode 100644
index 00000000000..82ed05cb0db
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.full.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini
new file mode 100644
index 00000000000..66e33c7369b
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.full.w.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini
new file mode 100644
index 00000000000..cbb623ca93b
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini
new file mode 100644
index 00000000000..acb8a58f63c
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html.ini
@@ -0,0 +1,2 @@
+[2d.layer.clearRect.partial.w.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html.ini
deleted file mode 100644
index 8b161ec63e7..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.arc.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini
deleted file mode 100644
index bd5646ca17c..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.arc.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html.ini
deleted file mode 100644
index c64dd8daf6f..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.bezierCurve.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini
deleted file mode 100644
index b16f7642c5b..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.bezierCurve.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html.ini
deleted file mode 100644
index 88b996cd49f..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.line.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini
deleted file mode 100644
index a1f8bf3ca80..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.line.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html.ini
deleted file mode 100644
index 27e16f3b0b3..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.quadraticCurve.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini
deleted file mode 100644
index 7ccc225dfa5..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.path.stroke.prune.closePath.quadraticCurve.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini b/tests/wpt/meta/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini
new file mode 100644
index 00000000000..6165716b2e7
--- /dev/null
+++ b/tests/wpt/meta/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html.ini
@@ -0,0 +1,150 @@
+[unicode-bidi-ua-rules.html]
+  [UA stylesheet rule for unicode-bidi, for <address>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <blockquote>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <center>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <div>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <figure>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <figcaption>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <footer>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <form>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <header>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <hr>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <legend>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <listing>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <main>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <p>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <plaintext>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <pre>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <summary>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <xmp>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <article>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <aside>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h1>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h2>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h3>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h4>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h5>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <h6>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <hgroup>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <nav>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <section>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <search>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <table>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <caption>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <colgroup>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <col>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <thead>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <tbody>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <tfoot>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <tr>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <td>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <th>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <dir>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <dd>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <dl>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <dt>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <menu>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <ol>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <ul>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <li>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <bdi>]
+    expected: FAIL
+
+  [UA stylesheet rule for unicode-bidi, for <output>]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 7d28d586f51..f455bb20528 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_escaping-1.html]
+  expected: CRASH
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index 26704422bbe..841bafc6eca 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
index c6f1e5d7d84..4034793cc72 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_nonescaping-2.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
new file mode 100644
index 00000000000..47b45e65a1c
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
@@ -0,0 +1,9 @@
+[non-active-document.html]
+  [DOMParser]
+    expected: FAIL
+
+  [createHTMLDocument]
+    expected: FAIL
+
+  [<template>]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini b/tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
deleted file mode 100644
index 7682a4830bf..00000000000
--- a/tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[reparent-form-during-planned-navigation-task.html]
-  expected: TIMEOUT
-  [reparent-form-during-planned-navigation-task]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini b/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
index 5f415ac1321..4ddb66f8401 100644
--- a/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
+++ b/tests/wpt/meta/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
@@ -181,3 +181,6 @@
 
   [application/x-www-form-urlencoded: 0x00 in value (formdata event)]
     expected: FAIL
+
+  [application/x-www-form-urlencoded: \\r\\n in name (formdata event)]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini b/tests/wpt/meta/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
index b31f3485d6b..293eae69db5 100644
--- a/tests/wpt/meta/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
+++ b/tests/wpt/meta/html/semantics/forms/the-select-element/select-parsing.tentative.html.ini
@@ -16,3 +16,6 @@
 
   [<select> in <select><button><div> should remove inner <select>.]
     expected: FAIL
+
+  [Nested <button>s or <datalist>s in <select> should be dropped.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/popovers/popovertarget-reflection.html.ini b/tests/wpt/meta/html/semantics/popovers/popovertarget-reflection.html.ini
new file mode 100644
index 00000000000..b181bd6a9c8
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/popovers/popovertarget-reflection.html.ini
@@ -0,0 +1,3 @@
+[popovertarget-reflection.html]
+  [Element attribute reflection of popoverTargetElement/popovertarget should be kept in sync.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini b/tests/wpt/meta/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
rename to tests/wpt/meta/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
diff --git a/tests/wpt/meta/html/syntax/parsing/unclosed-svg-script.html.ini b/tests/wpt/meta/html/syntax/parsing/unclosed-svg-script.html.ini
index 6af9488d235..78d56972597 100644
--- a/tests/wpt/meta/html/syntax/parsing/unclosed-svg-script.html.ini
+++ b/tests/wpt/meta/html/syntax/parsing/unclosed-svg-script.html.ini
@@ -4,3 +4,6 @@
 
   [SVG scripts with bogus end tag inside should run]
     expected: FAIL
+
+  [SVG scripts with self-closing start tag should run]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 1053fb90051..6206f8c0210 100644
--- a/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
+++ b/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
@@ -2,6 +2,3 @@
   expected: TIMEOUT
   [The incumbent settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
     expected: TIMEOUT
-
-  [The entry settings object while executing the compiled callback via Web IDL's invoke must be that of the node document]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
index 7237f5792de..dbe1def99e3 100644
--- a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
+++ b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
@@ -1,10 +1,9 @@
 [promise-job-entry-different-function-realm.html]
-  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Thenable resolution]
     expected: FAIL
@@ -13,4 +12,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/resource-timing/content-type-parsing.html.ini b/tests/wpt/meta/resource-timing/content-type-parsing.html.ini
index 49b17a921b5..71ca4ed5411 100644
--- a/tests/wpt/meta/resource-timing/content-type-parsing.html.ini
+++ b/tests/wpt/meta/resource-timing/content-type-parsing.html.ini
@@ -94,10 +94,10 @@
     expected: FAIL
 
   [mime-type 16 : text/html;charset=\x0bgbk]
-    expected: TIMEOUT
+    expected: FAIL
 
   [mime-type 17 : text/html;charset=\x0cgbk]
-    expected: NOTRUN
+    expected: TIMEOUT
 
   [mime-type 18 : text/html;\x0bcharset=gbk]
     expected: NOTRUN
diff --git a/tests/wpt/meta/resource-timing/test_resource_timing.html.ini b/tests/wpt/meta/resource-timing/test_resource_timing.html.ini
index 12581463c49..86a2572b9b8 100644
--- a/tests/wpt/meta/resource-timing/test_resource_timing.html.ini
+++ b/tests/wpt/meta/resource-timing/test_resource_timing.html.ini
@@ -68,6 +68,3 @@
 
   [PerformanceEntry has correct protocol attribute (xmlhttprequest)]
     expected: FAIL
-
-  [PerformanceEntry has correct name, initiatorType, startTime, and duration (img)]
-    expected: FAIL
diff --git a/tests/wpt/meta/webmessaging/without-ports/018.html.ini b/tests/wpt/meta/webmessaging/without-ports/018.html.ini
deleted file mode 100644
index b7b36c1d3a4..00000000000
--- a/tests/wpt/meta/webmessaging/without-ports/018.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta/websockets/stream/tentative/close.any.js.ini b/tests/wpt/meta/websockets/stream/tentative/close.any.js.ini
index cb09dbbe53b..e308a7fe944 100644
--- a/tests/wpt/meta/websockets/stream/tentative/close.any.js.ini
+++ b/tests/wpt/meta/websockets/stream/tentative/close.any.js.ini
@@ -261,6 +261,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.sharedworker.html?wpt_flags=h2]
   expected: ERROR
@@ -350,6 +368,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.html?wss]
   [close code should be sent to server and reflected back]
@@ -436,6 +472,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.serviceworker.html?wpt_flags=h2]
   expected: ERROR
@@ -525,6 +579,24 @@
   [canceling the readable with a DOMException should be ignored]
     expected: FAIL
 
+  [aborting the writable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [aborting the writable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [aborting the writable with a DOMException not set code or reason]
+    expected: FAIL
+
+  [canceling the readable with attributes not wrapped in a WebSocketError should be ignored]
+    expected: FAIL
+
+  [canceling the readable with a reason but no code should default the close code]
+    expected: FAIL
+
+  [canceling the readable with a DOMException not set code or reason]
+    expected: FAIL
+
 
 [close.any.serviceworker.html?wss]
   expected: ERROR
diff --git a/tests/wpt/meta/websockets/stream/tentative/websocket-error.any.js.ini b/tests/wpt/meta/websockets/stream/tentative/websocket-error.any.js.ini
new file mode 100644
index 00000000000..a7dd49c6863
--- /dev/null
+++ b/tests/wpt/meta/websockets/stream/tentative/websocket-error.any.js.ini
@@ -0,0 +1,69 @@
+[websocket-error.any.worker.html]
+  [WebSocketError defaults should be correct]
+    expected: FAIL
+
+  [WebSocketError should be initialised from arguments]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 1001 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 2999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 5000 should throw]
+    expected: FAIL
+
+  [passing only close code to WebSocketError should work]
+    expected: FAIL
+
+  [passing a non-empty reason should cause the close code to be set to 1000]
+    expected: FAIL
+
+  [overlong reason should throw]
+    expected: FAIL
+
+  [reason should be rejected based on utf-8 bytes, not character count]
+    expected: FAIL
+
+
+[websocket-error.any.sharedworker.html]
+  expected: ERROR
+
+[websocket-error.any.html]
+  [WebSocketError defaults should be correct]
+    expected: FAIL
+
+  [WebSocketError should be initialised from arguments]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 1001 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 2999 should throw]
+    expected: FAIL
+
+  [new WebSocketError with invalid code 5000 should throw]
+    expected: FAIL
+
+  [passing only close code to WebSocketError should work]
+    expected: FAIL
+
+  [passing a non-empty reason should cause the close code to be set to 1000]
+    expected: FAIL
+
+  [overlong reason should throw]
+    expected: FAIL
+
+  [reason should be rejected based on utf-8 bytes, not character count]
+    expected: FAIL
+
+
+[websocket-error.any.serviceworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini b/tests/wpt/meta/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini
deleted file mode 100644
index aa6c9e5b826..00000000000
--- a/tests/wpt/meta/webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.tentative.html]
-  expected: TIMEOUT
-  [StorageKey: test 3P about:blank window opened from a 3P iframe]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta/workers/baseurl/alpha/import-in-moduleworker.html.ini b/tests/wpt/meta/workers/baseurl/alpha/import-in-moduleworker.html.ini
index 36d21059338..987e8a93681 100644
--- a/tests/wpt/meta/workers/baseurl/alpha/import-in-moduleworker.html.ini
+++ b/tests/wpt/meta/workers/baseurl/alpha/import-in-moduleworker.html.ini
@@ -1,3 +1,4 @@
 [import-in-moduleworker.html]
+  expected: ERROR
   [Base URL in module dedicated workers: import]
     expected: FAIL
diff --git a/tests/wpt/meta/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini b/tests/wpt/meta/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini
new file mode 100644
index 00000000000..b8acd6da028
--- /dev/null
+++ b/tests/wpt/meta/workers/same-site-cookies/first-party.all.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.all.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option all for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini b/tests/wpt/meta/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini
new file mode 100644
index 00000000000..073d35de13a
--- /dev/null
+++ b/tests/wpt/meta/workers/same-site-cookies/first-party.default.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.default.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option default for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini b/tests/wpt/meta/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini
new file mode 100644
index 00000000000..85cd78c484b
--- /dev/null
+++ b/tests/wpt/meta/workers/same-site-cookies/first-party.none.tentative.https.window.js.ini
@@ -0,0 +1,3 @@
+[first-party.none.tentative.https.window.html]
+  [Check SharedWorker sameSiteCookies option none for first-party]
+    expected: FAIL
diff --git a/tests/wpt/meta/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini b/tests/wpt/meta/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini
new file mode 100644
index 00000000000..eddd0aa6c39
--- /dev/null
+++ b/tests/wpt/meta/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js.ini
@@ -0,0 +1,3 @@
+[third-party.default.tentative.sub.https.window.html]
+  [Check SharedWorker sameSiteCookies option default for third-party]
+    expected: FAIL
diff --git a/tests/wpt/meta/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini b/tests/wpt/meta/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini
new file mode 100644
index 00000000000..46f1697bd35
--- /dev/null
+++ b/tests/wpt/meta/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js.ini
@@ -0,0 +1,3 @@
+[third-party.none.tentative.sub.https.window.html]
+  [Check SharedWorker sameSiteCookies option none for third-party]
+    expected: FAIL
diff --git a/tests/wpt/tests/accessibility/crashtests/aria-owns-presentation.html b/tests/wpt/tests/accessibility/crashtests/aria-owns-presentation.html
new file mode 100644
index 00000000000..138625a1534
--- /dev/null
+++ b/tests/wpt/tests/accessibility/crashtests/aria-owns-presentation.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<div id="parent" aria-owns="owned"></div>
+<div id="owned" role="none"></div>
diff --git a/tests/wpt/tests/accessibility/crashtests/illegal-aria-owns-from-br.html b/tests/wpt/tests/accessibility/crashtests/illegal-aria-owns-from-br.html
new file mode 100644
index 00000000000..cb042b6f2bd
--- /dev/null
+++ b/tests/wpt/tests/accessibility/crashtests/illegal-aria-owns-from-br.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<div id="id1">abc</div>
+<br aria-owns="id1"></br>
diff --git a/tests/wpt/tests/content-security-policy/script-src/nonce-enforce-blocked.html b/tests/wpt/tests/content-security-policy/script-src/nonce-enforce-blocked.html
index 25343a5d4dc..71dcd49afe4 100644
--- a/tests/wpt/tests/content-security-policy/script-src/nonce-enforce-blocked.html
+++ b/tests/wpt/tests/content-security-policy/script-src/nonce-enforce-blocked.html
@@ -5,7 +5,7 @@
 <script nonce="abc">
     var t = async_test("Unnonced scripts generate reports.");
     var events = 0;
-    var firstLine = 38;
+    var firstLine = 43;
     var expectations = {}
     expectations[firstLine] = true;
     expectations[firstLine + 3] = true;
@@ -14,11 +14,16 @@
     expectations[firstLine + 12] = true;
     expectations[firstLine + 15] = true;
     expectations[firstLine + 18] = true;
+    expectations[firstLine + 21] = true;
+    expectations[firstLine + 24] = true;
+    expectations[firstLine + 28] = true;
     expectations["/content-security-policy/support/nonce-should-be-blocked.js?1"] = true;
     expectations["/content-security-policy/support/nonce-should-be-blocked.js?2"] = true;
     expectations["/content-security-policy/support/nonce-should-be-blocked.js?3"] = true;
     expectations["/content-security-policy/support/nonce-should-be-blocked.js?4"] = true;
     expectations["/content-security-policy/support/nonce-should-be-blocked.js?5"] = true;
+    expectations["/content-security-policy/support/nonce-should-be-blocked.js?6"] = true;
+    expectations["/content-security-policy/support/nonce-should-be-blocked.js?7"] = true;
 
     document.addEventListener('securitypolicyviolation', t.step_func(e => {
         if (e.lineNumber) {
@@ -31,7 +36,7 @@
             assert_true(expectations[url.pathname + url.search], "URL: " + e.blockedURI);
         }
         events++;
-        if (events == 12)
+        if (events == Object.keys(expectations).length)
           t.done();
     }));
 </script>
@@ -47,17 +52,30 @@
 <script attribute<script nonce="abc">
     t.unreached_func("'attribute<script', no execution.")();
 </script>
+<script attribute<style="value" nonce="abc">
+    t.unreached_func("'attribute<style' attribute, no execution.")();
+</script>
 <script attribute=<script nonce="abc">
     t.unreached_func("'<script' value, no execution.")();
 </script>
 <script attribute=value<script nonce="abc">
     t.unreached_func("'value<script', no execution.")();
 </script>
-<script attribute="" attribute=<style nonce="abc">
+<script attribute attribute nonce="abc">
     t.unreached_func("Duplicate attribute, no execution.")();
 </script>
+<script attribute attribute=<style nonce="abc">
+    t.unreached_func("2# Duplicate attribute, no execution.")();
+</script>
+<svg xmlns="http://www.w3.org/2000/svg">
+<script attribute attribute nonce="abc">
+    t.unreached_func("Duplicate attribute in SVG, no execution.")();
+</script>
+</svg>
 <script src="../support/nonce-should-be-blocked.js?1" <script nonce="abc"></script>
 <script src="../support/nonce-should-be-blocked.js?2" attribute=<script nonce="abc"></script>
 <script src="../support/nonce-should-be-blocked.js?3" <style nonce="abc"></script>
 <script src="../support/nonce-should-be-blocked.js?4" attribute=<style nonce="abc"></script>
-<script src="../support/nonce-should-be-blocked.js?5" attribute=<style nonce="abc"></script>
+<script src="../support/nonce-should-be-blocked.js?5" attribute attribute nonce="abc"></script>
+<script src="../support/nonce-should-be-blocked.js?6" attribute<script nonce="abc"></script>
+<script src="../support/nonce-should-be-blocked.js?7" attribute=value<script nonce="abc"></script>
diff --git a/tests/wpt/tests/credential-management/fedcm-authz/fedcm-userinfo-after-resolve.https.html b/tests/wpt/tests/credential-management/fedcm-authz/fedcm-userinfo-after-resolve.https.html
new file mode 100644
index 00000000000..ef53ed4ffca
--- /dev/null
+++ b/tests/wpt/tests/credential-management/fedcm-authz/fedcm-userinfo-after-resolve.https.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>Federated Credential Management API authz getUserInfo() tests.</title>
+<link rel="help" href="https://fedidcg.github.io/FedCM">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<body>
+
+<script type="module">
+import {alt_manifest_origin,
+        alt_request_options_with_mediation_required,
+        select_manifest,
+        fedcm_test,
+        fedcm_get_and_select_first_account} from '../support/fedcm-helper.sub.js';
+
+async function createIframeWithPermissionPolicyAndWaitForMessage(test, iframeUrl) {
+    const messageWatcher = new EventWatcher(test, window, "message");
+    let iframe = document.createElement("iframe");
+    iframe.src = iframeUrl;
+    iframe.allow = "identity-credentials-get";
+    document.body.appendChild(iframe);
+    const message = await messageWatcher.wait_for("message");
+    return message.data;
+}
+
+fedcm_test(async t => {
+  const options = alt_request_options_with_mediation_required('manifest_with_continue_on.json');
+  await select_manifest(t, options);
+  const cred = await fedcm_get_and_select_first_account(t, options);
+  assert_equals(cred.token, "resolved token");
+
+  const iframe_in_idp_scope = `${alt_manifest_origin}/\
+credential-management/support/fedcm/userinfo-iframe.html`;
+  const message = await createIframeWithPermissionPolicyAndWaitForMessage(t, iframe_in_idp_scope);
+  assert_equals(message.result, "Pass");
+  assert_equals(message.numAccounts, 1);
+  assert_equals(message.firstAccountEmail, "john_doe@idp.example");
+  assert_equals(message.firstAccountName, "John Doe");
+  assert_equals(message.firstAccountGivenName, "John");
+  assert_equals(message.firstAccountPicture, "https://idp.example/profile/123");
+}, 'Test getUserInfo() after resolve() to verify that resolve stores the RP/IDP connection');
+
+</script>
diff --git a/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-1-crash.html b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-1-crash.html
new file mode 100644
index 00000000000..79d90b89b65
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-1-crash.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/1520442">
+<style>
+  #outer {
+    display: list-item;
+    list-style-position: inside;
+    columns: 2;
+    column-fill: auto;
+    height: 100px;
+    font-size: 1px;
+    direction: rtl;
+  }
+  #inner {
+    float: right;
+    width: 100%;
+    height: 150px;
+  }
+</style>
+<div id="outer">
+  <div id="inner"></div>
+  x
+</div>
diff --git a/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-2-crash.html b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-2-crash.html
new file mode 100644
index 00000000000..c0c4daba84c
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-2-crash.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/1520442">
+<style>
+.c3 {
+  height: 10px;
+  direction: rtl;
+  zoom: 0.1;
+  column-span: all;
+}
+
+.c13 {
+  float: right;
+  border-style: solid;
+  column-count: 3;
+  column-gap: 65536px;
+}
+
+.c17 {
+  position: fixed;
+  zoom: 0.1;
+  column-width: 100%;
+  column-span: all;
+  column-count: 3;
+}
+</style>
+<bdo class="c3">
+  <li class="c17">
+    <span class="c13">
+      <option></option>
+      <dt></dt>
+    </span>
+    -1467632561
+  </li>
+</bdo>
diff --git a/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-3-crash.html b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-3-crash.html
new file mode 100644
index 00000000000..30e8d0dcfb9
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/floats/crashtests/float-rewind-parallel-flow-3-crash.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/1520442">
+<style>
+.c3 {
+  border-style: hidden;
+  height: 10px;
+  padding-right: 0px;
+  padding-bottom: 100px;
+  direction: rtl;
+  zoom: 0.1;
+  column-span: all;
+}
+
+.c7 {
+  overflow: hidden;
+  position: fixed;
+  float: left;
+  opacity: 0.0;
+}
+
+.c13 {
+  float: right;
+  border-style: solid;
+  zoom: 1;
+  transform: rotate3d(0, 1, 0, 90deg);
+  column-count: 3;
+  column-gap: 65536px;
+}
+
+.c16 {
+  padding-right: 100px;
+  padding-bottom: 65536px;
+  direction: rtl;
+  opacity: 1.00.5;
+  column-width: 10px;
+}
+
+.c17 {
+  position: fixed;
+  float: none;
+  border-style: dashed;
+  zoom: 0.1;
+  column-width: 100%;
+  column-span: all;
+  column-count: 3;
+}
+</style>
+<bdo class="c3">
+  <li class="c17">
+    <span class="c13">
+      <option class="c16"></option>
+      <dt class="c7"></dt>
+    </span>
+    -1467632561
+  </li>
+</bdo>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.tentative.html b/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.html
similarity index 54%
rename from tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.tentative.html
rename to tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.html
index 36b326b19e5..50cec96f366 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.tentative.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained-dynamic.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <title>CSS Anchor Positioning: anchor-name is style contained - dynamic containment</title>
-<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#determining">
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9100">
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#name">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/check-layout-th.js"></script>
@@ -13,48 +12,50 @@
   .anchor {
     width: 100px;
     height: 100px;
-  }
-  .a1 {
-    anchor-name: --a1;
-  }
-  .a2 {
-    anchor-name: --a2;
+    anchor-name: var(--anchor-name);
   }
   .contain-style {
     contain: style;
   }
   .target {
     position: absolute;
+    anchor-default: var(--anchor-name);
     top: anchor(bottom, 50px);
   }
-  #target-a1 {
-    anchor-default: --a1;
-  }
-  #target-a2 {
-    anchor-default: --a2;
-  }
+  #a1 { --anchor-name: --a1; }
+  #a2 { --anchor-name: --a2; }
+  #a3 { --anchor-name: --a3; }
 </style>
-<div class="container">
-  <div class="anchor a1"></div>
+<div id="a1" class="container">
+  <div class="anchor"></div>
   <div class="contain-style">
-    <div class="anchor a1"></div>
+    <div class="anchor"></div>
   </div>
-  <div id="target-a1" class="target" data-offset-y="100"></div>
+  <div class="target" data-offset-y="100"></div>
 </div>
-<div class="container">
-  <div class="anchor a2"></div>
-  <div class="anchor a2"></div>
+<div id="a2" class="container">
+  <div class="anchor"></div>
+  <div class="anchor"></div>
   <div class="contain-style">
-    <div id="target-a2" class="target" data-offset-y="50"></div>
+    <div class="target" data-offset-y="50"></div>
+  </div>
+</div>
+<div id="a3" class="container">
+  <div class="anchor contain-style">
+    <div class="target" data-offset-y="50"></div>
   </div>
 </div>
 <script type="module">
   await checkLayoutForAnchorPos('.target');
 
-  const t1 = document.querySelector("#target-a1");
-  const t2 = document.querySelector("#target-a2");
+  const t1 = document.querySelector("#a1 .target");
+  const t2 = document.querySelector("#a2 .target");
+  const t3 = document.querySelector("#a3 .target");
+  const t4 = document.querySelector("#a4 .target");
+  const t5 = document.querySelector("#a5 .target");
   t1.setAttribute("data-offset-y", "200");
   t2.setAttribute("data-offset-y", "200");
+  t3.setAttribute("data-offset-y", "100");
   for (let element of document.querySelectorAll(".contain-style")) {
     element.style.contain = "none";
   }
@@ -62,6 +63,7 @@
 
   t1.setAttribute("data-offset-y", "100");
   t2.setAttribute("data-offset-y", "50");
+  t3.setAttribute("data-offset-y", "50");
   for (let element of document.querySelectorAll(".contain-style")) {
     element.style.contain = "";
   }
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.html b/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.html
new file mode 100644
index 00000000000..a5295758891
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>CSS Anchor Positioning: anchor-name is style contained</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#name">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<script src="support/test-common.js"></script>
+<style>
+  .container {
+    position: relative;
+  }
+  .anchor {
+    width: 100px;
+    height: 100px;
+    anchor-name: var(--anchor-name);
+  }
+  .contain-style {
+    contain: style;
+  }
+  .target {
+    position: absolute;
+    anchor-default: var(--anchor-name);
+    top: anchor(bottom, 50px);
+  }
+  #a1 { --anchor-name: --a1; }
+  #a2 { --anchor-name: --a2; }
+  #a3 { --anchor-name: --a3; }
+  #a4 { --anchor-name: --a4; }
+  #a5 { --anchor-name: --a5; }
+</style>
+<body onload="checkLayoutForAnchorPos('.target')">
+<div id="a1" class="container">
+  <div class="anchor"></div>
+  <div class="contain-style">
+    <div class="anchor"></div>
+  </div>
+  <div class="target" data-offset-y="100"></div>
+</div>
+<div id="a2" class="container">
+  <div class="anchor"></div>
+  <div class="anchor"></div>
+  <div class="contain-style">
+    <div class="target" data-offset-y="50"></div>
+  </div>
+</div>
+<div id="a3" class="container">
+  <div class="contain-style">
+    <div class="anchor"></div>
+    <div class="target" data-offset-y="100"></div>
+  </div>
+</div>
+<div id="a4" class="container">
+  <div class="anchor contain-style">
+    <div class="target" data-offset-y="50"></div>
+  </div>
+</div>
+<div id="a5" class="container">
+  <div class="anchor contain-style"></div>
+  <div class="target" data-offset-y="100"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.tentative.html b/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.tentative.html
deleted file mode 100644
index 0d4afa7ee31..00000000000
--- a/tests/wpt/tests/css/css-anchor-position/anchor-name-style-contained.tentative.html
+++ /dev/null
@@ -1,51 +0,0 @@
-<!DOCTYPE html>
-<title>CSS Anchor Positioning: anchor-name is style contained</title>
-<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#determining">
-<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9100">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/check-layout-th.js"></script>
-<script src="support/test-common.js"></script>
-<style>
-  .container {
-    position: relative;
-  }
-  .anchor {
-    width: 100px;
-    height: 100px;
-  }
-  .a1 {
-    anchor-name: --a1;
-  }
-  .a2 {
-    anchor-name: --a2;
-  }
-  .contain-style {
-    contain: style;
-  }
-  .target {
-    position: absolute;
-    top: anchor(bottom, 50px);
-  }
-  #target-a1 {
-    anchor-default: --a1;
-  }
-  #target-a2 {
-    anchor-default: --a2;
-  }
-</style>
-<body onload="checkLayoutForAnchorPos('.target')">
-<div class="container">
-  <div class="anchor a1"></div>
-  <div class="contain-style">
-    <div class="anchor a1"></div>
-  </div>
-  <div id="target-a1" class="target" data-offset-y="100"></div>
-</div>
-<div class="container">
-  <div class="anchor a2"></div>
-  <div class="anchor a2"></div>
-  <div class="contain-style">
-    <div id="target-a2" class="target" data-offset-y="50"></div>
-  </div>
-</div>
diff --git a/tests/wpt/tests/css/css-anchor-position/anchor-position-dynamic-004.html b/tests/wpt/tests/css/css-anchor-position/anchor-position-dynamic-004.html
index b7944652a0b..146703e628b 100644
--- a/tests/wpt/tests/css/css-anchor-position/anchor-position-dynamic-004.html
+++ b/tests/wpt/tests/css/css-anchor-position/anchor-position-dynamic-004.html
@@ -30,7 +30,7 @@
 </style>
 <body>
   <div class="cb">
-    <div style="contain: strict; height: 50px">
+    <div style="contain: layout size paint; height: 50px">
       <div class="spacer" style="height: 10px"></div>
       <div id="anchor1"></div>
     </div>
diff --git a/tests/wpt/tests/css/css-backgrounds/animations/background-color-transition-colormix.html b/tests/wpt/tests/css/css-backgrounds/animations/background-color-transition-colormix.html
new file mode 100644
index 00000000000..3c7fd634c68
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/animations/background-color-transition-colormix.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<title>currentColor in nested color-mix() with transition</title>
+<link rel="help" href="https://drafts.csswg.org/css-color/#currentcolor-color">
+<style>
+    #parent {
+      color: white;
+      background-color:
+          color-mix(in srgb,
+                    color-mix(in srgb, black, currentColor),
+                    black);
+      height: 200px;
+      width: 200px;
+    }
+    #child {
+      background-color: inherit;
+      transition: background-color;
+      height: 100px;
+      width: 100px;
+    }
+</style>
+<div id="parent">
+  <div id="child"></div>
+</div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script>
+async function runTest() {
+  promise_test(async t => {
+    await waitForNextFrame();
+    const child = document.getElementById('child');
+    const parent = document.getElementById('parent');
+    let parentBG = getComputedStyle(parent).backgroundColor;
+    let childBG = getComputedStyle(child).backgroundColor;
+
+    assert_equals(parentBG, "color(srgb 0.25 0.25 0.25)");
+    assert_equals(childBG, "color(srgb 0.25 0.25 0.25)");
+
+    // Style change triggers a CSS transition. Wait for the
+    // transition to start.
+    await waitForNextFrame();
+    child.style = 'color:black';
+    await Promise.all(document.getAnimations().map(a => a.ready));
+
+    parentBG = getComputedStyle(parent).backgroundColor;
+    childBG = getComputedStyle(child).backgroundColor;
+    assert_equals(parentBG, "color(srgb 0.25 0.25 0.25)");
+    assert_equals(childBG, "color(srgb 0 0 0)");
+  }, 'Transition with currentColor in color-mix');
+}
+window.onload = runTest();
+</script>
diff --git a/tests/wpt/tests/css/css-cascade/all-prop-initial-xml.html b/tests/wpt/tests/css/css-cascade/all-prop-initial-xml.html
index c58a816a577..730ccac25f3 100644
--- a/tests/wpt/tests/css/css-cascade/all-prop-initial-xml.html
+++ b/tests/wpt/tests/css/css-cascade/all-prop-initial-xml.html
@@ -16,6 +16,8 @@ iframe.onload = setup_test.step_func_done(function() {
     // Grab initial styles from a random element, as the root can get non-initial UA styling.
     const div = iframe.contentDocument.createElementNS("http://www.w3.org/1999/xhtml", "div");
     root.appendChild(div);
+    // the document element should have unicode-bidi 'normal', while <div> has 'isolate':
+    div.style.unicodeBidi = 'normal';
     const cs = iframe.contentWindow.getComputedStyle(div);
 
     let actual_initial = Object.create(null);
diff --git a/tests/wpt/tests/css/css-color/light-dark-currentcolor-in-color.html b/tests/wpt/tests/css/css-color/light-dark-currentcolor-in-color.html
new file mode 100644
index 00000000000..7a95ea0b8ff
--- /dev/null
+++ b/tests/wpt/tests/css/css-color/light-dark-currentcolor-in-color.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CurrentColor can be used inside light-dark for the color property</title>
+<link rel="help" href="https://drafts.csswg.org/css-color-5/#light-dark">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  #parent { color: green; }
+  #child {
+    color-scheme: dark;
+    color: light-dark(red, currentColor);
+  }
+</style>
+<div id="parent">
+  <div id="child">Text should be green</div>
+</div>
+<script>
+  test(() => {
+    assert_equals(getComputedStyle(child).color, "rgb(0, 128, 0)");
+  }, "curentColor in light-dark() refers to parent color");
+</script>
diff --git a/tests/wpt/tests/css/css-color/system-color-support.html b/tests/wpt/tests/css/css-color/system-color-support.html
index a17ab6ab6ee..2392739a008 100644
--- a/tests/wpt/tests/css/css-color/system-color-support.html
+++ b/tests/wpt/tests/css/css-color/system-color-support.html
@@ -9,66 +9,84 @@
   <meta name="assert" content="system colors as defined are supported by the browser">
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
-	<style>
-		.group {
-			display: flex;
-			margin-bottom: 2px;
-			gap: 1em;
-		}
-		.group > div {
-			height: 1em;
-			width: 50%;
-		}
-	</style>
+  <style>
+    .group {
+      display: flex;
+      margin-bottom: 2px;
+      gap: 1em;
+    }
+    .group > div {
+      height: 1em;
+      width: 50%;
+    }
+  </style>
 </head>
 <body>
   <div style="display: none">
-	  <div id="test"></div>
+    <div id="test"></div>
   </div>
   <script>
-	  const testRoot = document.getElementById('test')
-	  const systemColors = [
-		  'Canvas',
-		  'CanvasText',
-		  'LinkText',
-		  'VisitedText',
-		  'ActiveText',
-		  'ButtonFace',
-		  'ButtonText',
-		  'ButtonBorder',
-		  'Field',
-		  'FieldText',
-		  'Highlight',
-		  'HighlightText',
-		  'SelectedItem',
-		  'SelectedItemText',
-		  'Mark',
-		  'MarkText',
-		  'GrayText',
-		  'AccentColor',
-		  'AccentColorText'
-	  ]
+    const testRoot = document.getElementById('test')
+    const SYSTEM_COLORS = [
+      'Canvas',
+      'CanvasText',
+      'LinkText',
+      'VisitedText',
+      'ActiveText',
+      'ButtonFace',
+      'ButtonText',
+      'ButtonBorder',
+      'Field',
+      'FieldText',
+      'Highlight',
+      'HighlightText',
+      'SelectedItem',
+      'SelectedItemText',
+      'Mark',
+      'MarkText',
+      'GrayText',
+      'AccentColor',
+      'AccentColorText',
+      'AppWorkspace',
+      'Scrollbar',
+    ];
 
-	  systemColors.forEach(systemColor => {
-		  const testGroup = document.createElement('div')
-		  testGroup.id = systemColor
-		  testGroup.className = 'group'
-		  testGroup.innerHTML = `
-			<div style="background-color: black; background-color: ${systemColor}"></div>
-			<div style="background-color: white; background-color: ${systemColor}"></div>`
-		  testRoot.appendChild(testGroup)
-	  })
+    // These colors ought to be color-scheme aware.
+    const COLOR_SCHEME_AWARE = [
+      'Canvas',
+      'CanvasText',
+      'AppWorkspace',
+      'Scrollbar',
+    ];
 
-	  systemColors.forEach(systemColor => {
-		  let group = document.getElementById(systemColor)
-		  let blackElement = group.firstElementChild
-		  let whiteElement = group.lastElementChild
-		  test(function() {
-			  let blackValue = getComputedStyle(blackElement).getPropertyValue('background-color');
-			  let whiteValue = getComputedStyle(whiteElement).getPropertyValue('background-color');
-			  assert_equals(blackValue, whiteValue);
-		  }, `System color ${systemColor} works`);
-	  })
+    for (let systemColor of SYSTEM_COLORS) {
+      const group = document.createElement('div')
+      group.id = systemColor
+      group.className = 'group'
+      group.innerHTML = `
+        <div style="background-color: black; background-color: ${systemColor}"></div>
+        <div style="background-color: white; background-color: ${systemColor}"></div>
+      `
+      testRoot.appendChild(group)
+      let blackElement = group.firstElementChild
+      let whiteElement = group.lastElementChild
+      test(function() {
+        assert_equals(
+          getComputedStyle(blackElement).backgroundColor,
+          getComputedStyle(whiteElement).backgroundColor,
+          `${systemColor} should be parsed`
+        );
+        if (COLOR_SCHEME_AWARE.includes(systemColor)) {
+          blackElement.style.colorScheme = "light";
+          whiteElement.style.colorScheme = "dark";
+          assert_not_equals(
+            getComputedStyle(blackElement).backgroundColor,
+            getComputedStyle(whiteElement).backgroundColor,
+            `${systemColor} should react to color-scheme`
+          );
+        }
+      }, `System color ${systemColor} works`);
+    }
   </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-contain/container-queries/container-name-tree-scoped.html b/tests/wpt/tests/css/css-contain/container-queries/container-name-tree-scoped.html
index e66f51d035d..d6ccaad2b9c 100644
--- a/tests/wpt/tests/css/css-contain/container-queries/container-name-tree-scoped.html
+++ b/tests/wpt/tests/css/css-contain/container-queries/container-name-tree-scoped.html
@@ -52,6 +52,21 @@
       #t2 { color: red; }
     }
   </style>
+
+  <div id="container-name-host-inner-container-rule">
+    <div id="t3host">
+      <template shadowrootmode="open">
+        <style>
+          :host { container-name: foo; }
+          #t3 { color: red; }
+          @container foo (width > 0px) {
+            #t3 { color: green; }
+          }
+        </style>
+        <div id="t3"></div>
+      </template>
+    </div>
+  </div>
 </div>
 
 <script>
@@ -70,4 +85,8 @@
     assert_equals(getComputedStyle(t2).color, green);
   }, "Outer scope query should not match container-name set by ::slotted rule in shadow tree");
 
+  test(() => {
+    assert_equals(getComputedStyle(t3host.shadowRoot.querySelector('#t3')).color, green);
+  }, "Inner scope query should match container-name set by :host rule in shadow tree");
+
 </script>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-008.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-008.html
new file mode 100644
index 00000000000..2911ef77839
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-with-top-layer-008.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<meta charset="utf8">
+<title>CSS Content Visibility: Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show</title>
+<link rel="author" title="Cathie Chen" href="mailto:cathiechen@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<meta name="assert" content="Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/rendering-utils.js"></script>
+
+<style>
+#inner {
+    content-visibility: auto;
+    contain-intrinsic-size: 100px 100px;
+}
+</style>
+
+<dialog id="dialog">
+    <div id="inner">
+        <div style="height: 200px; width: 200px;">content</div>
+    </div>
+    <div id="spacer" style="height: 100000px;"></div>
+</dialog>
+
+<script>
+promise_test(async () => {
+    let count = 0;
+    inner.addEventListener("contentvisibilityautostatechange", (e) => {
+        count++;
+    });
+
+    dialog.show();
+    // getBoundingClientRect shouldn't trigger "contentvisibilityautostatechange", because the proximity to the viewport is not determined now.
+    inner.getBoundingClientRect().height;
+
+    // It takes at least one frame to determine the proximity to the viewport.
+    await waitForAtLeastOneFrame();
+    // getBoundingClientRect should trigger "contentvisibilityautostatechange" now.
+    inner.getBoundingClientRect().height;
+
+    await waitForAtLeastOneFrame();
+    assert_equals(count, 1);
+    dialog.close();
+}, "Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show()");
+</script>
diff --git a/tests/wpt/tests/css/css-display/accessibility/display-contents-role-and-label.html b/tests/wpt/tests/css/css-display/accessibility/display-contents-role-and-label.html
new file mode 100644
index 00000000000..4a06d0ff5bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-display/accessibility/display-contents-role-and-label.html
@@ -0,0 +1,302 @@
+<!doctype html>
+<html>
+<head>
+  <title>Testing accessibility of display: contents</title>
+  <link rel="help" href="https://drafts.csswg.org/css-display-4/#box-generation">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/resources/testdriver-actions.js"></script>
+  <script src="/wai-aria/scripts/aria-utils.js"></script>
+</head>
+<body>
+
+  <!-- Dec 2023 notes for "display: contents" testing:
+  - Per CSS spec, setting "display: contents" must not alter an element's semantics (https://www.w3.org/TR/css-display-3/#valdef-display-contents):
+  "As only the box tree is affected, any semantics based on the document tree, such as selector-matching, event handling, and
+  property inheritance, are not affected."
+
+   - As of December 2023, the current state of cross-browser, automated web accessibility testing is limited to retrieving the following
+  accessibility object properties with planned future enhancements (https://github.com/WICG/aom/issues/203):
+      - computedRole
+      - computedLabel
+  -->
+
+  <h1>Testing accessibility of display: contents</h1>
+
+  <p>Verifies accessibility behavior of the <a href="https://www.w3.org/TR/css-display-3/#box-generation">contents</a> keyword for the CSS display property</p>
+
+  <h2>Accname</h2>
+
+  <button aria-labelledby="b2" style="display: contents;" data-expectedlabel="hidden label" data-expectedrole="button" data-testname="button with display: contents is labelled via referenced hidden span" class="ex-role-and-label">
+      <span aria-hidden="true" id="b2">hidden label</span>
+      <span hidden>hidden from all users</span>
+      <span>visible to all users</span>
+  </button>
+
+  <span id="a1">label</span>
+  <a href="#" aria-labelledby="a1" style="display: contents;" data-expectedlabel="label" data-expectedrole="link" data-testname="link with display: contents is labelled via aria-labelledby" class="ex-role-and-label">x</a>
+  <nav aria-labelledby="a1" style="display: contents;" data-expectedlabel="label" data-expectedrole="navigation" data-testname="nav with display: contents is labelled via aria-labelledby" class="ex-role-and-label">x</nav>
+
+  <button aria-label="label" style="display: contents;" data-expectedlabel="label" data-expectedrole="button" data-testname="button with display: contents is labelled via aria-label" class="ex-role-and-label">x</button>
+  <div role="group" aria-label="label" style="display: contents;" data-expectedlabel="label" data-expectedrole="group" data-testname="div with role group with display: contents is labelled via aria-label" class="ex-role-and-label">x</div>
+
+  <!-- <img> renders "display: contents" the same as "display:none", see: https://www.w3.org/TR/css-display-3/#unbox-html-->
+  <label for="label-for-button">label</label>
+  <button id="label-for-button" style="display: contents;" data-expectedlabel="label" data-expectedrole="button" data-testname="button with display: contents is labelled via label for/id association" class="ex-role-and-label">x</button>
+  <!-- SVG and display: contents behavior: https://github.com/w3c/svgwg/issues/305-->
+  <svg viewbox="0 0 100 50">
+    <g style="display: contents;" fill="silver" stroke="blue" data-expectedlabel="group label" data-expectedrole="group" data-testname="g element with display: contents, as child of svg, is labelled via title element" class="ex-role-and-label">
+      <title>group label</title>
+      <circle cx="20" cy="20" r="10" />
+      <circle cx="20" cy="20" r="10" />
+    </g>
+  </svg>
+
+  <a href="#" style="display: contents;" data-expectedlabel="label" data-expectedrole="link" data-testname="link with display: contents is labelled via name from contents" class="ex-role-and-label">label</a>
+  <button style="display: contents;" data-expectedlabel="label" data-expectedrole="button" data-testname="button with display: contents is labelled via name from contents" class="ex-role-and-label">label</button>
+  <h3 style="display: contents;" data-expectedlabel="label" data-expectedrole="heading" data-testname="h3 with display: contents is labelled via name from contents" class="ex-role-and-label">label</h3>
+
+  <h2>Accessibility roles</h2>
+  <!-- Buttons -->
+  <button style="display: contents;" data-expectedrole="button" data-expectedlabel="x" data-testname="button with display: contents has button role" class="ex-role-and-label">x</button>
+  <button role="button" style="display: contents;" data-expectedrole="button" data-expectedlabel="x" data-testname="button with explicit button role and display: contents has button role" class="ex-role-and-label">x</button>
+  <div role="button" style="display: contents;" data-expectedrole="button" data-expectedlabel="x" data-testname="div with button role and display: contents has button role" class="ex-role-and-label">x</div>
+  <div role="button" tabindex="0" style="display: contents;" data-expectedrole="button" data-expectedlabel="x" data-testname="div with button role, tabindex=0 and display: contents has button role" class="ex-role-and-label">x</div>
+
+  <!-- Display: Flex -->
+  <table style="display: flex; flex-flow: column nowrap;" data-expectedrole="table">
+    <thead>
+      <tr style="display: contents;" data-expectedrole="row" data-testname="tr with display: contents, within table with display: flex, has row role" class="ex-role">
+        <th data-expectedrole="columnheader" data-expectedlabel="x" data-testname="th as child of tr with display: contents, within table with display: flex, has columnheader role" class="ex-role-and-label">x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr style="display: contents;">
+        <td data-expectedrole="cell" data-expectedlabel="x" data-testname="td as child of tr with display: contents, within table with display: flex, has cell role" class="ex-role-and-label">x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <table role="table" style="display: flex; flex-flow: column nowrap;" data-expectedrole="table">
+    <thead>
+      <tr style="display: contents;" data-expectedrole="row" data-testname="tr with display: contents, within table with role=table with display: flex, has row role" class="ex-role">
+        <th data-expectedrole="columnheader" data-expectedlabel="x" data-testname="th as child of tr with display: contents, within table with role=table with display: flex, has columnheader role" class="ex-role-and-label">x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr style="display: contents;">
+        <td data-expectedrole="cell" data-expectedlabel="x" data-testname="td as child of tr with display: contents, within table with role=table with display: flex, has cell role" class="ex-role-and-label">x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <table role="grid" style="display: flex; flex-flow: column nowrap;" data-expectedrole="grid">
+    <thead>
+      <tr style="display: contents;" data-expectedrole="row" data-testname="tr with display: contents, within table with role=grid with display: flex, has row role" class="ex-role">
+        <th data-expectedrole="columnheader" data-expectedlabel="x" data-testname="th as child of tr with display: contents, within table with role=grid with display: flex, has columnheader role" class="ex-role-and-label">x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr style="display: contents;">
+        <td data-expectedrole="gridcell" data-expectedlabel="x" data-testname="td (no explicit role) as child of tr with display: contents, within table with role=grid with display: flex, has gridcell role" class="ex-role-and-label">x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <!-- Display: Grid -->
+  <div style="display: grid; grid-template-columns: 1fr 100px; grid-gap: 1em;">
+    <h2>x</h2>
+    <ul style="display: contents" data-expectedrole="list" data-testname="ul with display: contents, as child of div with display: grid, has list role" class="ex-role">
+      <li>x</li>
+      <li data-expectedrole="listitem" data-expectedlabel="x" data-testname="listitem within ul with display: contents, as child of div with display: grid, has listitem role" class="ex-role-and-label">x</li>
+    </ul>
+  </div>
+
+  <!-- Generics -->
+  <div style="display: contents;" data-testname="div with display: contents has generic role" class="ex-generic">x</div>
+  <span style="display: contents;" data-testname="span with display: contents has generic role" class="ex-generic">x</span>
+
+  <!-- Headings -->
+  <h3 style="display: contents;" data-expectedrole="heading" data-expectedlabel="x" data-testname="h3 with display: contents has heading role" class="ex-role-and-label">x</h3>
+  <div role="heading" aria-level="3" style="display: contents;" data-expectedrole="heading" data-expectedlabel="x" data-testname="div with heading role, aria-level=3 and display: contents has heading role" class="ex-role-and-label">x</div>
+  <span role="heading" aria-level="1" style="display: contents;" data-expectedrole="heading" data-expectedlabel="x" data-testname="span with heading role, aria-level=1 and display: contents has heading role" class="ex-role-and-label">x</span>
+
+  <!-- Landmarks and regions -->
+  <header style="display: contents;" data-expectedrole="banner" data-testname="header with display: contents has banner role" class="ex-role">x</header>
+  <nav style="display: contents;" aria-label="label" data-expectedrole="navigation" data-testname="nav with display: contents and aria-label has navigation role" class="ex-role-and-label">x</nav>
+  <aside style="display: contents;" aria-label="label" data-expectedrole="complementary" data-testname="aside with display: contents and aria-label has complementary role" class="ex-role-and-label">x</aside>
+  <main style="display: contents;" data-expectedrole="main" data-testname="main with display: contents has main role" class="ex-role">x</main>
+  <footer style="display: contents;" data-expectedrole="contentinfo" data-testname="footer with display: contents has contentinfo role" class="ex-role">x</footer>
+  <form aria-label="label" style="display: contents;" data-expectedrole="form" data-expectedlabel="label" data-testname="form with display: contents has form role" class="ex-role-and-label">x</form>
+  <search style="display: contents;" data-expectedrole="search" data-testname="search with display: contents has search role" class="ex-role">x</search>
+  <section aria-label="label" style="display: contents;" data-expectedrole="region" data-expectedlabel="label" data-testname="section with aria-label and display: contents has region role" class="ex-role-and-label"></section>
+
+  <div role="banner" style="display: contents;" data-expectedrole="banner" data-testname="div with role banner and display: contents has banner role" class="ex-role">x</div>
+  <div role="navigation" aria-label="label" style="display: contents;" data-expectedrole="navigation" data-testname="div with role navigation, aria-label and display: contents has navigation role" class="ex-role-and-label">x</div>
+  <div role="complementary" aria-label="label" style="display: contents;" data-expectedrole="complementary" data-testname="div with role complementary, aria-label and display: contents has complementary role" class="ex-role-and-label">x</div>
+  <div role="main" style="display: contents;" data-expectedrole="main" data-testname="div with role main and display: contents has main role" class="ex-role">x</div>
+  <div role="contentinfo" style="display: contents;" data-expectedrole="contentinfo" data-testname="div with role contentinfo and display: contents has contentinfo role" class="ex-role">x</div>
+  <div role="form" aria-label="label" style="display: contents;" data-expectedrole="form" data-expectedlabel="label" data-testname="div with role form, aria-label and display: contents has form role" class="ex-role-and-label">x</div>
+  <div role="search" aria-label="label" style="display: contents;" data-expectedrole="search" data-testname="div with role search and display: contents has search role" class="ex-role-and-label">x</div>
+  <div role="region" aria-label="label" style="display: contents;" data-expectedrole="region" data-expectedlabel="label" data-testname="div with role region, aria-label and display: contents has region role" class="ex-role-and-label">x</div>
+
+  <!-- Links -->
+  <a href="#" style="display: contents;" data-expectedrole="link" data-expectedlabel="x" data-testname="link with display: contents has link role" class="ex-role-and-label">x</a>
+  <a href="#" role="link" style="display: contents;" data-expectedrole="link" data-expectedlabel="x" data-testname="link with explicit link role and display: contents has link role" class="ex-role-and-label">x</a>
+  <div role="link" style="display: contents;" data-expectedrole="link" data-expectedlabel="x" data-testname="div with link role and display: contents has link role" class="ex-role-and-label">x</div>
+  <div role="link" tabindex="0" style="display: contents;" data-expectedrole="link" data-expectedlabel="x" data-testname="div with link role, tabindex=0 and display: contents has link role" class="ex-role-and-label">x</div>
+
+  <!-- Lists -->
+  <ul role="list" style="display: contents;" data-expectedrole="list" data-testname="ul with role list and display: contents (child li has display: contents) has list role" class="ex-role">
+    <li style="display: contents;" data-expectedrole="listitem" data-expectedlabel="x" data-testname="li as child of ul with role list, both with display: contents, has listitem role" class="ex-role-and-label">x</li>
+    <li>y</li>
+  </ul>
+
+  <ul role="list" style="display: contents;" data-expectedrole="list" data-testname="ul with role list and display: contents has list role" class="ex-role">
+    <li>x</li>
+    <li data-expectedrole="listitem" data-expectedlabel="y" data-testname="li, as child of ul with role list and display: contents, has listitem role" class="ex-role-and-label">y</li>
+  </ul>
+
+  <ul role="list">
+    <li>x</li>
+    <li style="display: contents;" data-expectedrole="listitem" data-expectedlabel="y" data-testname="li with display: contents, as child of ul with role list, has listitem role" class="ex-role-and-label">y</li>
+  </ul>
+
+  <ol role="list" style="display: contents;" data-expectedrole="list" data-testname="ol with role list and display: contents has list role (child li has display: contents)" class="ex-role">
+    <li style="display: contents;" data-expectedrole="listitem" data-expectedlabel="x" data-testname="li as child of ol with role list, both with display: contents, has listitem role" class="ex-role-and-label">x</li>
+    <li>y</li>
+  </ol>
+
+  <ol role="list" style="display: contents;" data-expectedrole="list" data-testname="ol with role list and display: contents has list role" class="ex-role">
+    <li>x</li>
+    <li data-expectedrole="listitem" data-expectedlabel="y" data-testname="li, as child of ol with role list and display: contents, has listitem role" class="ex-role-and-label">y</li>
+  </ol>
+
+  <ol role="list">
+    <li>x</li>
+    <li style="display: contents;" data-expectedrole="listitem" data-expectedlabel="y" data-testname="li with display: contents, as child of ol with role list, has listitem role" class="ex-role-and-label">y</li>
+  </ol>
+
+  <div role="list" style="display: contents;" data-expectedrole="list" data-testname="div with list role and display: contents has list role" class="ex-role">
+    <div role="listitem" data-expectedrole="listitem" data-expectedlabel="x" data-testname="div with listitem role, as child of div with display: contents, has listitem role" class="ex-role-and-label">x</div>
+    <div>y</div>
+  </div>
+
+  <div role="list" style="display: contents;" data-expectedrole="list" data-testname="div with list role and display: contents has list role (child div with listitem role has display: contents)" class="ex-role">
+    <div>x</div>
+    <div role="listitem" style="display: contents;" data-expectedrole="listitem" data-expectedlabel="y" data-testname="div with listitem role (as child of div with list role), both with display: contents, has listitem role" class="ex-role-and-label">y</div>
+  </div>
+
+  <div role="list">
+    <div>x</div>
+    <div role="listitem" style="display: contents;" data-expectedrole="listitem" data-expectedlabel="y" data-testname="div with listitem role with display: contents, as child of div with list role, has listitem role" class="ex-role-and-label">y</div>
+  </div>
+
+  <!-- Lists: description/definition lists -> wpt/html-aam/roles.html -->
+
+  <!-- Tables (including grids/treegrids) -->
+  <table role="table" style="display: contents;" data-expectedrole="table" data-testname="table with role table and display: contents has table role" class="ex-role">
+    <thead>
+      <tr style="display: contents;" data-expectedrole="row" data-testname="tr in table with role table and display: contents has row role" class="ex-role">
+        <th style="display: contents;" data-expectedrole="columnheader" data-expectedlabel="x" data-testname="td within tr both with display: contents, in table with role table and display: contents, has columnheader role" class="ex-role-and-label">x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td style="display: contents;" data-expectedrole="cell" data-expectedlabel="x" data-testname="td within tr in table with role table, all with display: contents, has cell role" class="ex-role-and-label">x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <div role="table" style="display: contents;" data-expectedrole="table" data-testname="div with role table with display: contents has table role" class="ex-role">
+    <div role="rowgroup" style="display: contents;" data-expectedrole="rowgroup" data-testname="div with role rowgroup in div with role table, both with display: contents, has rowgroup role" class="ex-role">
+      <div role="row">
+        <div role="columnheader" style="display: contents;" data-expectedrole="columnheader" data-expectedlabel="x" data-testname="div with role columnheader with display: contents, in div with role rowgroup within div with table role both with display: contents, has columnheader role" class="ex-role-and-label">x</div>
+        <div role="columnheader">x</div>
+      </div>
+    </div>
+    <div role="rowgroup">
+      <div role="row">
+        <div role="cell">x</div>
+        <div role="cell">x</div>
+      </div>
+    </div>
+  </div>
+
+  <table role="grid" style="display: contents;" data-expectedrole="grid" data-testname="table with role grid and display: contents has grid role">
+    <thead>
+      <tr style="display: contents;" data-expectedrole="row" data-testname="tr within table with role grid, both with display: contents, has row role">
+        <th style="display: contents;" data-expectedrole="columnheader" data-expectedlabel="x" data-testname="th within table with role grid, both with display: contents, has columnheader role" class="ex-role-and-label">x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td style="display: contents;" data-expectedrole="gridcell" data-expectedlabel="x" data-testname="td within table with role grid, both with display: contents, has gridcell role" class="ex-role-and-label">x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <div role="grid" style="display: contents;" data-expectedrole="grid" data-testname="div with role grid with display: contents has grid role" class="ex-role">
+    <div role="rowgroup" style="display: contents;" data-expectedrole="rowgroup" data-testname="div with role rowgroup in div with role grid, both with display: contents, has rowgroup role" class="ex-role">
+      <div role="row">
+        <div role="columnheader" style="display: contents;" data-expectedrole="columnheader" data-expectedlabel="x" data-testname="div with role columnheader with display: contents, in div with role rowgroup within div with grid role both with display: contents, has rowgroup role" class="ex-role-and-label">x</div>
+        <div role="columnheader">x</div>
+      </div>
+    </div>
+    <div role="rowgroup">
+      <div role="row">
+        <div role="gridcell"></div>
+        <div role="gridcell" style="display: contents;" data-expectedrole="gridcell" data-expectedlabel="x" data-testname="div with gridcell role and display: contents, within div with role row contained in a div with role grid both with display: contents, has gridcell role" class="ex-role-and-label">x</div>
+      </div>
+    </div>
+  </div>
+
+  <table role="grid" tabindex="0" style="display: contents;" data-expectedrole="grid" data-testname="div with role grid, tabindex=0 and display: contents has grid role" >
+    <thead>
+      <tr>
+        <th>x</th>
+        <th>x</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td>x</td>
+        <td>x</td>
+      </tr>
+    </tbody>
+  </table>
+
+  <table role="treegrid" style="display: contents;" data-expectedrole="treegrid" data-testname="table with role treegrid and display: contents has treegrid role" class="ex-role"></table>
+  <div role="treegrid" style="display: contents;" data-expectedrole="treegrid" data-testname="div with role treegrid and display: contents has treegrid role" class="ex-role"></div>
+
+  <ul role="tree" style="display: contents;" data-expectedrole="tree" data-testname="ul with role tree and display: contents has tree role" class="ex-role">
+    <li role="treeitem" aria-expanded="true" style="display: contents;" data-expectedrole="treeitem" data-expectedlabel="x" data-testname="li with role treeitem and display: contents, within ul with role tree and display: contents, has treeitem role" class="ex-role-and-label">
+      <span>x</span>
+      <ul role="group">
+        <li role="treeitem" aria-expanded="false" style="display: contents;" data-expectedrole="treeitem" data-expectedlabel="x" data-testname="li with role treeitem and display: contents, within ul with role=group (within ul with role tree and display: contents), has treeitem role" class="ex-role-and-label">
+          <span>x</span>
+        </li>
+      </ul>
+    </li>
+  </ul>
+
+<script>
+  AriaUtils.verifyRolesBySelector(".ex-role");
+  AriaUtils.verifyRolesAndLabelsBySelector(".ex-role-and-label");
+  AriaUtils.verifyGenericRolesBySelector(".ex-generic");
+</script>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-display/display-contents-001-crash.html b/tests/wpt/tests/css/css-display/display-contents-001-crash.html
new file mode 100644
index 00000000000..376c3b549aa
--- /dev/null
+++ b/tests/wpt/tests/css/css-display/display-contents-001-crash.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1144434">
+</head>
+<body onload="c.style.display = 'inline-block';">
+
+<div style="display: table-cell;"></div><div style="display: contents;"><div id="c"></div></div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-display/display-contents-fieldset-nested-legend.html b/tests/wpt/tests/css/css-display/display-contents-fieldset-nested-legend.html
index a3bd2fc9983..abda0ad32d0 100644
--- a/tests/wpt/tests/css/css-display/display-contents-fieldset-nested-legend.html
+++ b/tests/wpt/tests/css/css-display/display-contents-fieldset-nested-legend.html
@@ -19,6 +19,7 @@ fieldset {
   display: contents;
   color: green;
   border: 10px solid red;
+  unicode-bidi: normal;
 }
 </style>
 <fieldset><legend class="contents">P<legend>legend</legend>ASS</legend></fieldset>
diff --git a/tests/wpt/tests/css/css-display/focus/display-contents-focus.html b/tests/wpt/tests/css/css-display/focus/display-contents-focus.html
new file mode 100644
index 00000000000..8f1e2c5c901
--- /dev/null
+++ b/tests/wpt/tests/css/css-display/focus/display-contents-focus.html
@@ -0,0 +1,49 @@
+<!doctype html>
+<html>
+<head>
+  <title>Testing focus for display: contents</title>
+  <link rel="help" href="https://drafts.csswg.org/css-display-4/#box-generation">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/resources/testdriver-actions.js"></script>
+</head>
+<body>
+
+  <!-- Dec 2023 notes for "display: contents" testing:
+  - Per CSS spec, setting "display: contents" must not alter an element's semantics (https://www.w3.org/TR/css-display-3/#valdef-display-contents):
+  "As only the box tree is affected, any semantics based on the document tree, such as selector-matching, event handling, and
+  property inheritance, are not affected."
+
+  -->
+
+  <h1>Testing focusability of display: contents</h1>
+
+  <button style="display: contents;" class="ex-focusable" data-testname="button with display: contents is focusable">x</button>
+  <div role="button" tabindex="0" style="display: contents;" class="ex-focusable" data-testname="div with role button, tabindex=0 and display: contents is focusable"></div>
+  <div role="button" tabindex="-1" style="display: contents;" class="ex-focusable" data-testname="div with role button, tabindex=-1 and display: contents is focusable"></div>
+
+  <a href="#" style="display: contents;" class="ex-focusable" data-testname="link with display: contents is focusable">x</a>
+  <span role="link" tabindex="0" style="display: contents;" class="ex-focusable" data-testname="span with role link, tabindex=0 and display: contents is focusable"></span>
+
+<script>
+  verifyElementsAreFocusable();
+
+  function verifyElementsAreFocusable() {
+    const els = document.querySelectorAll(".ex-focusable");
+    if (!els.length) {
+      throw `Selector passed in verifyElementsAreFocusable should match at least one element.`;
+    }
+    for (const el of els) {
+      let testName = el.getAttribute("data-testname");
+      test(() => {
+        el.focus();
+        assert_equals(document.activeElement, el, "Element is focusable with element.focus()");
+      }, `${testName}`);
+    }
+  };
+</script>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-flexbox/align-content-wrap-003.html b/tests/wpt/tests/css/css-flexbox/align-content-wrap-003.html
index 3e07338745b..e46fca8187f 100644
--- a/tests/wpt/tests/css/css-flexbox/align-content-wrap-003.html
+++ b/tests/wpt/tests/css/css-flexbox/align-content-wrap-003.html
@@ -152,20 +152,20 @@
   <div data-offset-x="0" data-offset-y="40" data-expected-height="20"></div>
 </div>
 
-<!-- If we overflow, we should true center. -->
+<!-- If we overflow, we should safe center. -->
 <div data-expected-height="30" class="flexbox horizontal" style="align-content: space-around; height: 30px">
-  <div data-offset-x="0" data-offset-y="-15" data-expected-height="20"></div>
-  <div data-offset-x="100" data-offset-y="-15" data-expected-height="20"></div>
-  <div data-offset-x="0" data-offset-y="5" data-expected-height="20"></div>
-  <div data-offset-x="0" data-offset-y="25" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="0" data-expected-height="20"></div>
+  <div data-offset-x="100" data-offset-y="0" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="20" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="40" data-expected-height="20"></div>
 </div>
 
 <!-- If we overflow, we should true center. -->
 <div data-expected-height="30" class="flexbox horizontal" style="align-content: space-evenly; height: 30px">
-  <div data-offset-x="0" data-offset-y="-15" data-expected-height="20"></div>
-  <div data-offset-x="100" data-offset-y="-15" data-expected-height="20"></div>
-  <div data-offset-x="0" data-offset-y="5" data-expected-height="20"></div>
-  <div data-offset-x="0" data-offset-y="25" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="0" data-expected-height="20"></div>
+  <div data-offset-x="100" data-offset-y="0" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="20" data-expected-height="20"></div>
+  <div data-offset-x="0" data-offset-y="40" data-expected-height="20"></div>
 </div>
 
 <!-- Stretch should only grow, not shrink. -->
@@ -281,20 +281,20 @@
   <div data-offset-x="-30" data-offset-y="0" data-expected-width="20"></div>
 </div>
 
-<!-- If we overflow, we should true center. -->
+<!-- If we overflow, we should safe center. -->
 <div data-expected-width="30" class="flexbox vertical-rl" style="align-content: space-around; width: 30px;">
-  <div data-offset-x="25" data-offset-y="0" data-expected-width="20"></div>
-  <div data-offset-x="25" data-offset-y="10" data-expected-width="20"></div>
-  <div data-offset-x="5" data-offset-y="0" data-expected-width="20"></div>
-  <div data-offset-x="-15" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="10" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="10" data-offset-y="10" data-expected-width="20"></div>
+  <div data-offset-x="-10" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="-30" data-offset-y="0" data-expected-width="20"></div>
 </div>
 
 <!-- If we overflow, we should true center. -->
 <div data-expected-width="30" class="flexbox vertical-rl" style="align-content: space-evenly; width: 30px;">
-  <div data-offset-x="25" data-offset-y="0" data-expected-width="20"></div>
-  <div data-offset-x="25" data-offset-y="10" data-expected-width="20"></div>
-  <div data-offset-x="5" data-offset-y="0" data-expected-width="20"></div>
-  <div data-offset-x="-15" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="10" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="10" data-offset-y="10" data-expected-width="20"></div>
+  <div data-offset-x="-10" data-offset-y="0" data-expected-width="20"></div>
+  <div data-offset-x="-30" data-offset-y="0" data-expected-width="20"></div>
 </div>
 
 <!-- Stretch should only grow, not shrink. -->
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-003-ref.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-003-ref.xhtml
index 4ad2dc202ea..444ead8665e 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-003-ref.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-003-ref.xhtml
@@ -91,24 +91,24 @@
     </div>
 
     <!-- space-around -->
-    <div class="flexbox" style="margin-left: 97.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-left: 77.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-left: 55px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
     <!-- space-evenly -->
-    <div class="flexbox" style="margin-left: 97.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-left: 77.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-left: 55px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-004-ref.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-004-ref.xhtml
index 231729d8565..23a6d98904d 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-004-ref.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-horiz-004-ref.xhtml
@@ -103,24 +103,24 @@
     </div>
 
     <!-- space-around -->
-    <div class="flexbox" style="margin-left: 92.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-left: 66.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-left: 39px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
     <!-- space-evenly -->
-    <div class="flexbox" style="margin-left: 92.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-left: 66.5px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-left: 39px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
@@ -136,13 +136,13 @@
     </div>
 
     <!-- right -->
-    <div class="flexbox" style="margin-left: 85px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-left: 33px">
+    <div class="flexbox" style="margin-left: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-left: -22px">
+    <div class="flexbox" style="margin-left: 0px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-003-ref.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-003-ref.xhtml
index 12064db1a5d..ee3714e08b1 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-003-ref.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-003-ref.xhtml
@@ -89,24 +89,24 @@
     </div>
 
     <!-- space-around -->
-    <div class="flexbox" style="margin-top: 97.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-top: 77.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-top: 55px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
     <!-- space-evenly -->
-    <div class="flexbox" style="margin-top: 97.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-top: 77.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-top: 55px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-004-ref.xhtml b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-004-ref.xhtml
index b3a45e06f13..7ef2c3ac11c 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-004-ref.xhtml
+++ b/tests/wpt/tests/css/css-flexbox/flexbox-justify-content-vert-004-ref.xhtml
@@ -100,24 +100,24 @@
     </div>
 
     <!-- space-around -->
-    <div class="flexbox" style="margin-top: 92.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-top: 66.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-top: 39px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
     <!-- space-evenly -->
-    <div class="flexbox" style="margin-top: 92.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/>
     </div>
-    <div class="flexbox" style="margin-top: 66.5px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/>
     </div>
-    <div class="flexbox" style="margin-top: 39px">
+    <div class="flexbox" style="margin-top: 100px">
       <div class="a"/><div class="b"/><div class="c"/>
     </div>
 
diff --git a/tests/wpt/tests/css/css-flexbox/flexbox_justifycontent-spacearound-negative-ref.html b/tests/wpt/tests/css/css-flexbox/flexbox_justifycontent-spacearound-negative-ref.html
index b5ec4d58e60..619a333a3bd 100644
--- a/tests/wpt/tests/css/css-flexbox/flexbox_justifycontent-spacearound-negative-ref.html
+++ b/tests/wpt/tests/css/css-flexbox/flexbox_justifycontent-spacearound-negative-ref.html
@@ -16,16 +16,16 @@ span {
 	width: 4em;
 	height: 6em;
 	position: absolute;
-	left: 0.5em;
+	left: 1em;
 	display: inline-block;
 }
 span:nth-child(2) {
 	background: pink;
-	left: 6.5em;
+	left: 7em;
 }
 span:nth-child(3) {
 	background: lightblue;
-	left: 12.5em;
+	left: 13em;
 }
 </style>
 
diff --git a/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-026.html b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-026.html
index b56d6384379..8f5a8111c54 100644
--- a/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-026.html
+++ b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-026.html
@@ -1,8 +1,8 @@
 <!DOCTYPE html>
 <link rel="help" href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-evenly">
 <link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
-<meta name="assert" content="The fallback alignment for 'space-evenly' should be 'center'.">
+<meta name="assert" content="The fallback alignment for 'space-evenly' should be 'safe center'.">
 <p>Test passes if there is a filled green square.</p>
 <div style="display: grid; width: 50px; height: 50px; align-content: space-evenly; justify-content: space-evenly;">
-  <div style="width: 100px; height: 100px; background: green; position: relative; top: 25px; left: 25px;"></div>
+  <div style="width: 100px; height: 100px; background: green;"></div>
 </div>
diff --git a/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-027.html b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-027.html
index f92ed520d03..35e300ee64d 100644
--- a/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-027.html
+++ b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-027.html
@@ -1,8 +1,8 @@
 <!DOCTYPE html>
 <link rel="help" href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-around">
 <link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
-<meta name="assert" content="The fallback alignment for 'space-around' should be 'center'.">
+<meta name="assert" content="The fallback alignment for 'space-around' should be 'safe center'.">
 <p>Test passes if there is a filled green square.</p>
 <div style="display: grid; width: 50px; height: 50px; align-content: space-around; justify-content: space-around;">
-  <div style="width: 100px; height: 100px; background: green; position: relative; top: 25px; left: 25px;"></div>
+  <div style="width: 100px; height: 100px; background: green;"></div>
 </div>
diff --git a/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-029.html b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-029.html
new file mode 100644
index 00000000000..95f52813799
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/alignment/grid-content-distribution-029.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#positional-values">
+<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
+<link rel="author" title="Kurt Catti-Schmidt" href="mailto:kschmi@microsoft.com">
+<meta name="assert" content="Alignment must work after max-width clamps the aspect ratio.">
+<p>Test passes if there is a filled green square.</p>
+<div style="display: grid; width: 100px; aspect-ratio: 2; max-width: 50px; align-content: center;">
+  <div style="width: 100px; height: 100px; background: green;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-grid/alignment/grid-place-content-001.html b/tests/wpt/tests/css/css-grid/alignment/grid-place-content-001.html
index 49bb63928be..cc1fe75799c 100644
--- a/tests/wpt/tests/css/css-grid/alignment/grid-place-content-001.html
+++ b/tests/wpt/tests/css/css-grid/alignment/grid-place-content-001.html
@@ -73,7 +73,7 @@
   <div data-offset-x="40" data-offset-y="40">X</div>
 </div>
 <div class="grid small content-box space-around">
-  <div data-offset-x="20" data-offset-y="20">X</div>
+  <div data-offset-x="40" data-offset-y="40">X</div>
 </div>
 
 <pre>box-sizing: border-box</pre>
@@ -91,7 +91,7 @@
   <div data-offset-x="40" data-offset-y="40">X</div>
 </div>
 <div class="grid small border-box space-around">
-  <div data-offset-x="20" data-offset-y="20">X</div>
+  <div data-offset-x="40" data-offset-y="40">X</div>
 </div>
 
 <h3>Big content area</h3>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/grid-gap-006-ref.html b/tests/wpt/tests/css/css-grid/subgrid/grid-gap-006-ref.html
index d94181ddc4f..35af77634fe 100644
--- a/tests/wpt/tests/css/css-grid/subgrid/grid-gap-006-ref.html
+++ b/tests/wpt/tests/css/css-grid/subgrid/grid-gap-006-ref.html
@@ -16,7 +16,7 @@ span:nth-child(2n+1) { background:grey; }
 </head>
 <body>
 
-<div style="display:inline-grid; grid:100px/100px 10px 10px; gap:100px; border:1px solid; justify-content:center; width:50px">
+<div style="display:inline-grid; grid:100px/100px 10px 10px; gap:100px; border:1px solid; justify-content:start; width:50px">
   <div style="display:grid; grid:100px/140px 50px; gap:20px; grid-column:span 2">
     <span>a</span><span>b</span>
   </div>
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001-ref.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001-ref.html
new file mode 100644
index 00000000000..939dfc80731
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>CSS Overflow Reference: Root element's scrollbar-gutter is accounted for in fixed-pos positioning</title>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<style>
+:root {
+  scrollbar-gutter: stable;
+}
+body {
+  margin: 0;
+}
+.fixed {
+  width: 100px;
+  height: 100px;
+  background: green;
+  position: absolute;
+}
+</style>
+
+<div class="fixed" style="left: 0"></div>
+<div class="fixed" style="right: 0"></div>
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001.html
new file mode 100644
index 00000000000..d7ba106249e
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-001.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>CSS Overflow Test: Root element's scrollbar-gutter is accounted for in fixed-pos positioning</title>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=728807">
+<link rel="match" href="scrollbar-gutter-fixedpos-001-ref.html">
+<style>
+:root {
+  scrollbar-gutter: stable;
+}
+body {
+  margin: 0;
+}
+.fixed {
+  width: 100px;
+  height: 100px;
+  background: green;
+  position: fixed;
+}
+</style>
+
+<div class="fixed" style="left: 0"></div>
+<div class="fixed" style="right: 0"></div>
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002-ref.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002-ref.html
new file mode 100644
index 00000000000..4019f3f2d3e
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>CSS Overflow Reference: Root element's scrollbar-gutter is accounted for in fixed-pos positioning</title>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<style>
+:root {
+  scrollbar-gutter: stable both-edges;
+}
+body {
+  margin: 0;
+}
+.fixed {
+  width: 100px;
+  height: 100px;
+  background: green;
+  position: absolute;
+}
+</style>
+
+<div class="fixed" style="left: 0"></div>
+<div class="fixed" style="right: 0"></div>
diff --git a/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002.html b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002.html
new file mode 100644
index 00000000000..1776b8d735a
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/scrollbar-gutter-fixedpos-002.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<title>CSS Overflow Test: Root element's scrollbar-gutter is accounted for in fixed-pos positioning</title>
+<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=728807">
+<link rel="match" href="scrollbar-gutter-fixedpos-002-ref.html">
+<style>
+:root {
+  scrollbar-gutter: stable both-edges;
+}
+body {
+  margin: 0;
+}
+.fixed {
+  width: 100px;
+  height: 100px;
+  background: green;
+  position: fixed;
+}
+</style>
+
+<div class="fixed" style="left: 0"></div>
+<div class="fixed" style="right: 0"></div>
diff --git a/tests/wpt/tests/css/css-tables/table-cell-scroll-height.html b/tests/wpt/tests/css/css-tables/table-cell-scroll-height.html
new file mode 100644
index 00000000000..6ebaf7ad6a3
--- /dev/null
+++ b/tests/wpt/tests/css/css-tables/table-cell-scroll-height.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollheight">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1876745">
+<div id="target" style="display: table-cell; height: 100px; overflow: hidden"></div>
+<script>
+  test(() => {
+    assert_equals(target.scrollHeight, 100);
+  }, `scrollHeight on scrollable table cell`);
+</script>
diff --git a/tests/wpt/tests/css/css-text-decor/text-shadow/standards-decor-noblur-2.html b/tests/wpt/tests/css/css-text-decor/text-shadow/standards-decor-noblur-2.html
index 5b420da52b8..75d95b578dc 100644
--- a/tests/wpt/tests/css/css-text-decor/text-shadow/standards-decor-noblur-2.html
+++ b/tests/wpt/tests/css/css-text-decor/text-shadow/standards-decor-noblur-2.html
@@ -1,7 +1,7 @@
 <!DOCTYPE HTML>
 <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-shadow-property">
 <link rel="match" href="standards-decor-noblur-2-ref.html">
-<meta name="fuzzy" content="0-2;0-10">
+<meta name="fuzzy" content="0-40;0-14">
 <!-- Shadows are painted below text AND its decorations -->
 <style>
 #target {
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-computed.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-computed.html
index 772f0abf4d9..aa9c3c57053 100644
--- a/tests/wpt/tests/css/css-text/parsing/text-wrap-computed.html
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-computed.html
@@ -19,24 +19,19 @@ test_computed_value("text-wrap", "nowrap");
 test_computed_value("text-wrap", "auto", "wrap");
 test_computed_value("text-wrap", "balance");
 test_computed_value("text-wrap", "stable");
-test_computed_value("text-wrap", "pretty");
 
 test_computed_value("text-wrap", "wrap auto", "wrap");
 test_computed_value("text-wrap", "wrap balance", "balance");
-test_computed_value("text-wrap", "wrap pretty", "pretty");
 test_computed_value("text-wrap", "wrap stable", "stable");
 test_computed_value("text-wrap", "auto wrap", "wrap");
 test_computed_value("text-wrap", "balance wrap", "balance");
-test_computed_value("text-wrap", "pretty wrap", "pretty");
 test_computed_value("text-wrap", "stable wrap", "stable");
 
 test_computed_value("text-wrap", "nowrap auto", "nowrap");
 test_computed_value("text-wrap", "nowrap balance");
-test_computed_value("text-wrap", "nowrap pretty");
 test_computed_value("text-wrap", "nowrap stable");
 test_computed_value("text-wrap", "auto nowrap", "nowrap");
 test_computed_value("text-wrap", "balance nowrap", "nowrap balance");
-test_computed_value("text-wrap", "pretty nowrap", "nowrap pretty");
 test_computed_value("text-wrap", "stable nowrap", "nowrap stable");
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-pretty.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-pretty.html
new file mode 100644
index 00000000000..425d1b9c971
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-pretty.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Text Module Test: text-wrap: pretty parsing</title>
+<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-wrap">
+<meta name="assert" content="text-wrap: pretty parsing">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_valid_value("text-wrap", "pretty");
+test_valid_value("text-wrap", "wrap pretty", "pretty");
+test_valid_value("text-wrap", "pretty wrap", "pretty");
+test_valid_value("text-wrap", "stable wrap", "stable");
+test_valid_value("text-wrap", "nowrap pretty");
+test_valid_value("text-wrap", "pretty nowrap", "nowrap pretty");
+test_valid_value("text-wrap-style", "pretty");
+
+test_computed_value("text-wrap", "pretty");
+test_computed_value("text-wrap", "wrap pretty", "pretty");
+test_computed_value("text-wrap", "pretty wrap", "pretty");
+test_computed_value("text-wrap", "stable wrap", "stable");
+test_computed_value("text-wrap", "nowrap pretty");
+test_computed_value("text-wrap", "pretty nowrap", "nowrap pretty");
+test_computed_value("text-wrap-style", "pretty");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-style-computed.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-style-computed.html
index 0a4a22d9c5f..14c9f03cf91 100644
--- a/tests/wpt/tests/css/css-text/parsing/text-wrap-style-computed.html
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-style-computed.html
@@ -15,7 +15,6 @@
 <script>
 test_computed_value("text-wrap-style", "auto");
 test_computed_value("text-wrap-style", "balance");
-test_computed_value("text-wrap-style", "pretty");
 test_computed_value("text-wrap-style", "stable");
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-style-valid.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-style-valid.html
index b3ca09ef2c6..f826bdd2f04 100644
--- a/tests/wpt/tests/css/css-text/parsing/text-wrap-style-valid.html
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-style-valid.html
@@ -14,7 +14,6 @@
 <script>
 test_valid_value("text-wrap-style", "auto");
 test_valid_value("text-wrap-style", "balance");
-test_valid_value("text-wrap-style", "pretty");
 test_valid_value("text-wrap-style", "stable");
 
 test_valid_value("text-wrap-style", "initial");
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
index a2eed8c429f..95a855338e0 100644
--- a/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
@@ -18,24 +18,19 @@ test_valid_value("text-wrap", "nowrap");
 test_valid_value("text-wrap", "auto", "wrap");
 test_valid_value("text-wrap", "balance");
 test_valid_value("text-wrap", "stable");
-test_valid_value("text-wrap", "pretty");
 
 test_valid_value("text-wrap", "wrap auto", "wrap");
 test_valid_value("text-wrap", "wrap balance", "balance");
-test_valid_value("text-wrap", "wrap pretty", "pretty");
 test_valid_value("text-wrap", "wrap stable", "stable");
 test_valid_value("text-wrap", "auto wrap", "wrap");
 test_valid_value("text-wrap", "balance wrap", "balance");
-test_valid_value("text-wrap", "pretty wrap", "pretty");
 test_valid_value("text-wrap", "stable wrap", "stable");
 
 test_valid_value("text-wrap", "nowrap auto", "nowrap");
 test_valid_value("text-wrap", "nowrap balance");
-test_valid_value("text-wrap", "nowrap pretty");
 test_valid_value("text-wrap", "nowrap stable");
 test_valid_value("text-wrap", "auto nowrap", "nowrap");
 test_valid_value("text-wrap", "balance nowrap", "nowrap balance");
-test_valid_value("text-wrap", "pretty nowrap", "nowrap pretty");
 test_valid_value("text-wrap", "stable nowrap", "nowrap stable");
 
 test_valid_value("text-wrap", "initial");
diff --git a/tests/wpt/tests/css/css-text/text-transform/reference/text-transform-uppercase-dynamic-ref.html b/tests/wpt/tests/css/css-text/text-transform/reference/text-transform-uppercase-dynamic-ref.html
new file mode 100644
index 00000000000..1fede4447df
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-transform/reference/text-transform-uppercase-dynamic-ref.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style>
+.test { text-transform: uppercase; }
+</style>
+<div class="test" lang="my">
+  <span id="sp">i̇̃ Ĩ</span>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-transform/text-transform-uppercase-dynamic.html b/tests/wpt/tests/css/css-text/text-transform/text-transform-uppercase-dynamic.html
new file mode 100644
index 00000000000..b8683ad5125
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-transform/text-transform-uppercase-dynamic.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<link rel="help" href="http://www.w3.org/TR/css-text-3/#text-transform">
+<link rel="match" href="reference/text-transform-uppercase-dynamic-ref.html">
+<style>
+.test { text-transform: uppercase; }
+</style>
+<script>
+requestAnimationFrame(() => {
+  requestAnimationFrame(() => {
+    document.getElementById('sp').setAttribute('lang', 'my');
+    document.documentElement.classList.remove('reftest-wait');
+  });
+});
+</script>
+<div class="test" lang="lt">
+  <span id="sp">i̇̃ Ĩ</span>
+</div>
+</html>
diff --git a/tests/wpt/tests/css/css-transitions/animations/transition-timing-function.html b/tests/wpt/tests/css/css-transitions/animations/transition-timing-function.html
index 0184b29a796..6dc42f55292 100644
--- a/tests/wpt/tests/css/css-transitions/animations/transition-timing-function.html
+++ b/tests/wpt/tests/css/css-transitions/animations/transition-timing-function.html
@@ -62,8 +62,8 @@
         anim.currentTime = 500;
         promises.push(anim.ready);
       });
-      Promise.all(promises).then(() => {
-        assert_equals(promises.length, 5, 'Unexpected animation count');
+      await Promise.all(promises).then(() => {
+        assert_equals(promises.length, 6, 'Unexpected animation count');
         verifyPosition('box1', 200);  // linear easing
         verifyPosition('box2', ease());
         verifyPosition('box3', easeIn());
diff --git a/tests/wpt/tests/css/css-ui/inheritance.html b/tests/wpt/tests/css/css-ui/inheritance.html
index 9a2efdd049e..1eaa901aa0a 100644
--- a/tests/wpt/tests/css/css-ui/inheritance.html
+++ b/tests/wpt/tests/css/css-ui/inheritance.html
@@ -37,6 +37,9 @@ assert_not_inherited('appearance', 'none', 'auto');
 assert_inherited('caret-color', currentColor, 'rgba(42, 53, 64, 0.75)');
 assert_inherited('caret-shape', 'auto', 'bar');
 assert_inherited('cursor', 'auto', 'pointer');
+if (CSS.supports('user-find', 'auto')) {
+  assert_inherited('user-find', 'auto', 'none');
+}
 assert_not_inherited('nav-down', 'auto', '#foo');
 assert_not_inherited('nav-left', 'auto', '#foo');
 assert_not_inherited('nav-right', 'auto', '#foo');
diff --git a/tests/wpt/tests/css/css-ui/parsing/user-find-computed.tentative.html b/tests/wpt/tests/css/css-ui/parsing/user-find-computed.tentative.html
new file mode 100644
index 00000000000..91c0d3f7397
--- /dev/null
+++ b/tests/wpt/tests/css/css-ui/parsing/user-find-computed.tentative.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS UI Level 4: getComputedStyle().userFind</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3460">
+<meta name="assert" content="user-find computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("user-find", "auto");
+test_computed_value("user-find", "none");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-ui/parsing/user-find-invalid.tentative.html b/tests/wpt/tests/css/css-ui/parsing/user-find-invalid.tentative.html
new file mode 100644
index 00000000000..1d85f284956
--- /dev/null
+++ b/tests/wpt/tests/css/css-ui/parsing/user-find-invalid.tentative.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS UI Level 4: parsing user-find with invalid values</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3460">
+<meta name="assert" content="user-find supports only the grammar 'auto | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("user-find", "visible");
+test_invalid_value("user-find", "never");
+test_invalid_value("user-find", "10px");
+test_invalid_value("user-find", "'none'");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-ui/parsing/user-find-valid.tentative.html b/tests/wpt/tests/css/css-ui/parsing/user-find-valid.tentative.html
new file mode 100644
index 00000000000..ab963c296a6
--- /dev/null
+++ b/tests/wpt/tests/css/css-ui/parsing/user-find-valid.tentative.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS UI Level 4: parsing user-find with valid values</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3460">
+<meta name="assert" content="user-find supports the grammar 'auto | none'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("user-find", "auto");
+test_valid_value("user-find", "none");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-ui/user-find.tentative.html b/tests/wpt/tests/css/css-ui/user-find.tentative.html
new file mode 100644
index 00000000000..b15d813d11d
--- /dev/null
+++ b/tests/wpt/tests/css/css-ui/user-find.tentative.html
@@ -0,0 +1,57 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3460">
+<title>Basic test for the user-find property</title>
+<body>
+<script>
+const t = async_test("Basic test for the user-find property");
+
+function testFindable(findCount, textToFind, buildDoc, description) {
+  if (typeof findCount == "boolean")
+    findCount = findCount ? 1 : 0;
+  try {
+    const iframe = document.querySelector("iframe")
+    iframe.contentDocument.documentElement.innerHTML =
+      (typeof buildDoc == "string") ? buildDoc : "";
+
+    if (typeof buildDoc == "function")
+      buildDoc(iframe.contentDocument);
+
+    iframe.contentWindow.getSelection().removeAllRanges();
+    for (let i = findCount; i >= 0; --i) {
+      const expectFindable = i != 0;
+      assert_equals(
+        iframe.contentWindow.find(textToFind),
+        expectFindable,
+        "Should be " + (expectFindable ? "" : "not ") + "findable: " + description + ", text: " + textToFind + ", iter: " + (findCount - i + 1)
+      );
+    }
+  } catch (ex) {
+    assert_unreached(ex);
+  }
+}
+
+let runTests = t.step_func_done(function() {
+  testFindable(true, "me", `
+    Find me please
+  `, "sanity test");
+
+  testFindable(false, "me", `
+    <div style="user-find: none">Do not find me please</div>
+  `, "Basic use case");
+
+  testFindable(true, "me", `
+    <div style="user-find: none">Do not find me, but <span style="user-find: auto">find me please</span></div>
+  `, "nested");
+});
+
+window.onload = function() {
+  let iframe = document.createElement("iframe");
+  iframe.onload = runTests;
+  iframe.srcdoc = "<!doctype html><html></html>";
+  document.body.appendChild(iframe);
+};
+</script>
+</body>
diff --git a/tests/wpt/tests/css/css-values/minmax-percentage-serialize.html b/tests/wpt/tests/css/css-values/minmax-percentage-serialize.html
index 65ab9fad961..0452818ae09 100644
--- a/tests/wpt/tests/css/css-values/minmax-percentage-serialize.html
+++ b/tests/wpt/tests/css/css-values/minmax-percentage-serialize.html
@@ -44,6 +44,18 @@ test_serialization(
     'min(3%, 2%, 1%)',
     'min(3%, 2%, 1%)',
     '1px');
+test_serialization(
+    'min(-1%, 1%)',
+    'min(-1%, 1%)',
+    'min(-1%, 1%)',
+    '-1px');
+// -0% simplifies and serializes to 0%
+// See https://github.com/w3c/csswg-drafts/issues/9750
+test_serialization(
+    'min(-0%, 0%)',
+    'min(0%, 0%)',
+    'min(0%, 0%)',
+    '0px');
 test_serialization(
     'max(1%, 2%, 3%)',
     'max(1%, 2%, 3%)',
@@ -54,6 +66,16 @@ test_serialization(
     'max(3%, 2%, 1%)',
     'max(3%, 2%, 1%)',
     '3px');
+test_serialization(
+    'max(-1%, 1%)',
+    'max(-1%, 1%)',
+    'max(-1%, 1%)',
+    '1px');
+test_serialization(
+    'max(-0%, 0%)',
+    'max(0%, 0%)',
+    'max(0%, 0%)',
+    '0px');
 
 // Also ensure that this works against a possibly-negative resolving value...
 test_serialization(
diff --git a/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-invalid-with-classes.html b/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-invalid-with-classes.html
new file mode 100644
index 00000000000..66443c5cd7a
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-invalid-with-classes.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Test pseudo elements parsing of invalid selectors with classes</title>
+<link rel="author" href="https://github.com/noamr">
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+const functionPseudoElements = [
+    "::view-transition-group",
+    "::view-transition-image-pair",
+    "::view-transition-old",
+    "::view-transition-new",
+];
+
+function test_invalid_selector_combinations(pseudo) {
+    test_invalid_selector(`${pseudo}.a`);
+    test_invalid_selector(`${pseudo} div`);
+    test_invalid_selector(`${pseudo}:hover`);
+    test_invalid_selector(`:not(${pseudo})`);
+    test_invalid_selector(`:has(${pseudo})`);
+}
+
+for (const fn of functionPseudoElements) {
+  test_invalid_selector(`${fn}(*.*)`);
+  test_invalid_selector(`${fn}(*. cls)`);
+  test_invalid_selector(`${fn}(*.cls. c)`);
+  test_invalid_selector(`${fn}(*.cls>cls)`);
+  test_invalid_selector(`${fn}(*.cls.foo.*)`);
+}
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-valid-with-classes.html b/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-valid-with-classes.html
new file mode 100644
index 00000000000..8ddf2e28d60
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/parsing/pseudo-elements-valid-with-classes.html
@@ -0,0 +1,33 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Test pseudo elements parsing of valid selectors including classes</title>
+<link rel="author" href="https://github.com/nrosenthal">
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<script>
+const functionPseudoElements = [
+    "::view-transition-group",
+    "::view-transition-image-pair",
+    "::view-transition-old",
+    "::view-transition-new",
+];
+
+function test_valid_selector_combinations(pseudo) {
+    test_valid_selector(pseudo);
+    test_valid_selector(`:root${pseudo}`);
+    test_valid_selector(`.a${pseudo}`);
+    test_valid_selector(`div ${pseudo}`);
+}
+
+test_valid_selector_combinations("::view-transition");
+
+for (const functionName of functionPseudoElements) {
+    for (const validArgument of
+        ["*.class", "*.class.class", "dashed-ident.someclass", "dash-id.dash-id", "foo.bar.baz"]) {
+        test_valid_selector_combinations(`${functionName}(${validArgument})`);
+        test_valid_selector_combinations(`${functionName}(${validArgument}):only-child`);
+    }
+}
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html b/tests/wpt/tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html
new file mode 100644
index 00000000000..6caadeba899
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>
+View transitions: Resizing viewport before animating rejects the ready promise.
+</title>
+<link rel="help" href="https://github.com/WICG/view-transitions">
+<link rel="author" href="mailto:bokan@chromium.org">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script>
+function pollForResize(win) {
+  const initial_width = win.innerWidth;
+  return new Promise(resolve => {
+    const interval_id = win.setInterval(() => {
+      if (win.innerWidth != initial_width) {
+        win.clearInterval(interval_id);
+        resolve();
+      }
+    }, 100);
+  });
+}
+
+promise_test(async t => {
+  assert_implements(
+      document.startViewTransition, 'Missing document.startViewTransition');
+
+  let popup_win;
+
+  // Open a popup window that we'll use to start a transition
+  await test_driver.bless('Open a popup in a new window', () => {
+      popup_win = window.open('about:blank', 'popup', 'width=300,height=300');
+  });
+
+  // Resize the window while the update callback is running (i.e. before
+  // capturing the new state).
+  let transition = popup_win.document.startViewTransition(async () => {
+    // resizeTo is asynchonous so we want to wait until it takes effect
+    // before proceeding to capture the new state. Needs to poll for a
+    // changed size since rAFs are currently blocked (and thus, so is
+    // `resize` event).
+    const popup_resize = pollForResize(popup_win);
+    popup_win.resizeTo(popup_win.innerWidth/2, popup_win.innerHeight/2);
+    await popup_resize;
+  });
+
+  // Since the window was resized before capturing the new state, the
+  // transition must be skipped and the ready promise rejected.
+
+  let did_finish = false;
+  transition.finished.then(() => { did_finish = true; });
+
+  await promise_rejects_dom(t, 'InvalidStateError', popup_win.DOMException,
+      transition.ready, 'Resize must must reject `ready`.');
+
+  assert_true(did_finish, 'Transition must be skipped.');
+});
+</script>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal-rtl.optional.html
new file mode 100644
index 00000000000..65bbd653b5c
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal-rtl.optional.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-meter-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Meter appearance native writing mode horizontal & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="meter-appearance-native-horizontal.optional.html">
+<link rel="mismatch" href="meter-appearance-native-vertical-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The meter element below should match the correct writing mode.</p>
+<meter value="70" min="0" max="100" style="writing-mode: horizontal-tb; direction: rtl"></meter>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal.optional.html
index 7b25e1a9000..1e7a8df8ab9 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-horizontal.optional.html
@@ -4,6 +4,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
 <title>Meter appearance native writing mode horizontal</title>
 <meta charset="utf-8">
+<link rel="mismatch" href="meter-appearance-native-horizontal-rtl.optional.html">
 <link rel="mismatch" href="meter-appearance-native-vertical.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical-rtl.optional.html
new file mode 100644
index 00000000000..e488d8dd51f
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical-rtl.optional.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-meter-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Meter appearance native writing mode vertical & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="meter-appearance-native-horizontal-rtl.optional.html">
+<link rel="mismatch" href="meter-appearance-native-vertical.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The meter element below should match the correct writing mode.</p>
+<meter value="70" min="0" max="100" style="writing-mode: vertical-rl; direction: rtl"></meter>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical.optional.html
index 6beca6bfa15..2205d5615d6 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/meter-appearance-native-vertical.optional.html
@@ -2,9 +2,10 @@
 <link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
 <link rel="help" href="https://html.spec.whatwg.org/#the-meter-element">
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
-<title>Meter appearance native writing mode horizontal</title>
+<title>Meter appearance native writing mode vertical</title>
 <meta charset="utf-8">
 <link rel="mismatch" href="meter-appearance-native-horizontal.optional.html">
+<link rel="mismatch" href="meter-appearance-native-vertical-rtl.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
 <p>The meter element below should match the correct writing mode.</p>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal-rtl.optional.html
new file mode 100644
index 00000000000..319050638b9
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal-rtl.optional.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-progress-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Progress appearance native writing mode horizontal & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-native-horizontal.optional.html">
+<link rel="mismatch" href="progress-appearance-none-horizontal-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-native-vertical-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The range input below should match the correct writing mode & direction.</p>
+<progress value="70" min="0" max="100" style="writing-mode: horizontal-tb; direction: rtl"></progress>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal.optional.html
index ad7d2aa4479..bdda28675e8 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-horizontal.optional.html
@@ -4,8 +4,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
 <title>Progress appearance native writing mode horizontal</title>
 <meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-native-horizontal-rtl.optional.html">
 <link rel="mismatch" href="progress-appearance-native-vertical.optional.html">
-<link rel="mismatch" href="progress-appearance-none-vertical.optional.html">
+<link rel="mismatch" href="progress-appearance-none-horizontal.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
 <p>The progress element below should match the correct writing mode.</p>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical-rtl.optional.html
new file mode 100644
index 00000000000..9a1834e46d2
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical-rtl.optional.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-progress-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Progress appearance native writing mode vertical & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-native-horizontal-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-native-vertical.optional.html">
+<link rel="mismatch" href="progress-appearance-none-vertical-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The progress element below should match the correct writing mode.</p>
+<progress value="70" min="0" max="100" style="writing-mode: vertical-rl; direction: rtl"></progress>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical.optional.html
index 38ca538b09d..5ddfa207615 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-native-vertical.optional.html
@@ -5,7 +5,8 @@
 <title>Progress appearance native writing mode vertical</title>
 <meta charset="utf-8">
 <link rel="mismatch" href="progress-appearance-native-horizontal.optional.html">
-<link rel="mismatch" href="progress-appearance-none-horizontal.optional.html">
+<link rel="mismatch" href="progress-appearance-native-vertical-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-none-vertical.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
 <p>The progress element below should match the correct writing mode.</p>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal-rtl.optional.html
new file mode 100644
index 00000000000..4276cac6332
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal-rtl.optional.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-progress-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Progress appearance none writing mode horizontal & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-none-horizontal.optional.html">
+<link rel="mismatch" href="progress-appearance-none-vertical-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-native-horizontal-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The progress element below should match the correct writing mode.</p>
+<progress value="70" min="0" max="100" style="writing-mode: horizontal-tb; appearance: none; direction: rtl"></progress>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal.optional.html
index adb05704c62..cda8a007155 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-horizontal.optional.html
@@ -4,8 +4,9 @@
 <link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
 <title>Progress appearance none writing mode horizontal</title>
 <meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-none-horizontal-rtl.optional.html">
 <link rel="mismatch" href="progress-appearance-none-vertical.optional.html">
-<link rel="mismatch" href="progress-appearance-native-vertical.optional.html">
+<link rel="mismatch" href="progress-appearance-native-horizontal.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
 <p>The progress element below should match the correct writing mode.</p>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical-rtl.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical-rtl.optional.html
new file mode 100644
index 00000000000..56baeb472f6
--- /dev/null
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical-rtl.optional.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/#the-progress-element">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#block-flow">
+<title>Progress appearance none writing mode vertical & RTL direction</title>
+<meta charset="utf-8">
+<link rel="mismatch" href="progress-appearance-none-vertical.optional.html">
+<link rel="mismatch" href="progress-appearance-native-vertical-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-none-horizontal-rtl.optional.html">
+
+<!-- Note test description should be the same across all files to mismatch on. -->
+<p>The progress element below should match the correct writing mode.</p>
+<progress value="70" min="0" max="100" style="appearance: none; writing-mode: vertical-rl; direction: rtl"></progress>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical.optional.html
index db9aac21f2f..b02f725504e 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/progress-appearance-none-vertical.optional.html
@@ -5,7 +5,8 @@
 <title>Progress appearance none writing mode vertical</title>
 <meta charset="utf-8">
 <link rel="mismatch" href="progress-appearance-none-horizontal.optional.html">
-<link rel="mismatch" href="progress-appearance-native-horizontal.optional.html">
+<link rel="mismatch" href="progress-appearance-none-vertical-rtl.optional.html">
+<link rel="mismatch" href="progress-appearance-native-vertical.optional.html">
 
 <!-- Note test description should be the same across all files to mismatch on. -->
 <p>The progress element below should match the correct writing mode.</p>
diff --git a/tests/wpt/tests/css/css-writing-modes/unicode-bidi-parsing-001.html b/tests/wpt/tests/css/css-writing-modes/unicode-bidi-parsing-001.html
index 2672873f819..4c9558c11aa 100644
--- a/tests/wpt/tests/css/css-writing-modes/unicode-bidi-parsing-001.html
+++ b/tests/wpt/tests/css/css-writing-modes/unicode-bidi-parsing-001.html
@@ -8,8 +8,8 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
-<div title="Initial value of unicode-bidi"
-  data-expected="normal"></div>
+<span title="Initial value of unicode-bidi"
+  data-expected="normal"></span>
 
 <div style="unicode-bidi: embed; unicode-bidi: normal"
   data-expected="normal"></div>
@@ -19,8 +19,8 @@
   data-expected="bidi-override"></div>
 
 <div style="unicode-bidi: embed">
-  <div title="unicode-bidi should not inherit"
-    data-expected="normal"></div>
+  <span title="unicode-bidi should not inherit"
+    data-expected="normal"></span>
 </div>
 
 <script>
diff --git a/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html
index fd519c85525..24d3806eb99 100644
--- a/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html
+++ b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html
@@ -1,3 +1,8 @@
 <!DOCTYPE html>
 <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    border: solid transparent;
+  }
+</style>
 This text should be visible.
diff --git a/tests/wpt/tests/css/printing/table-overflow-quirks-frameset-crash-print.html b/tests/wpt/tests/css/printing/table-overflow-quirks-frameset-crash-print.html
new file mode 100644
index 00000000000..a79b8149011
--- /dev/null
+++ b/tests/wpt/tests/css/printing/table-overflow-quirks-frameset-crash-print.html
@@ -0,0 +1,18 @@
+<!-- quirks -->
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1877591">
+<!-- Really a crashtest but since we can't really have print crashtests, we assert that we print something -->
+<link rel="mismatch" href="/css/reference/blank.html">
+<style>
+* {
+  bottom: 1px;
+  overflow-y: auto;
+}
+</style>
+<table>
+  <th>
+    <span id="a"></span>
+  </th>
+</table>
+<script>
+  a.appendChild(document.createElement("frameset"));
+</script>
diff --git a/tests/wpt/tests/css/selectors/parsing/invalid-pseudos.html b/tests/wpt/tests/css/selectors/parsing/invalid-pseudos.html
index 4076e5302bd..a4be206b258 100644
--- a/tests/wpt/tests/css/selectors/parsing/invalid-pseudos.html
+++ b/tests/wpt/tests/css/selectors/parsing/invalid-pseudos.html
@@ -9,9 +9,15 @@
 <script>
 // Pseudo-classes
 test_invalid_selector(":-internal-animating-full-screen-transition");
+test_invalid_selector(":-internal-fullscreen-document");
 test_invalid_selector(":-internal-html-document");
+test_invalid_selector(":-internal-media-document");
 test_invalid_selector(":-khtml-drag");
 test_invalid_selector(":-webkit-animating-full-screen-transition");
+test_invalid_selector(":-webkit-full-page-media");
+test_invalid_selector(":-webkit-full-screen-ancestor");
+test_invalid_selector(":-webkit-full-screen-controls-hidden");
+test_invalid_selector(":-webkit-full-screen-document");
 
 // Pseudo-elements
 test_invalid_selector("::-apple-attachment-controls-container");
diff --git a/tests/wpt/tests/custom-elements/element-internals-aria-element-reflection.html b/tests/wpt/tests/custom-elements/element-internals-aria-element-reflection.html
new file mode 100644
index 00000000000..76905a93bd0
--- /dev/null
+++ b/tests/wpt/tests/custom-elements/element-internals-aria-element-reflection.html
@@ -0,0 +1,172 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>Element Reflection for aria-activedescendant and aria-errormessage on ElementInternals</title>
+  <link rel=help href="https://whatpr.org/html/3917/common-dom-interfaces.html#reflecting-content-attributes-in-idl-attributes:element">
+  <link rel="author" title="Alice Boxhall" href="alice@igalia.com">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<body>
+  <script>
+    class CustomElement extends HTMLElement {
+      constructor() {
+        super();
+        this.i = this.attachInternals();
+      }
+    }
+    customElements.define('custom-element', CustomElement);
+  </script>
+
+  <custom-element id="custom1"></custom-element>
+  <div id="activedescendant">Active descendant</div>
+  <div id="controls">Controls</div>
+  <div id="describedby">Described by</div>
+  <div id="details">Details</div>
+  <div id="errormessage">Error message</div>
+  <div id="flowto">Flow to</div>
+  <div id="labelledby">Labelled By</div>
+  <div id="owns">Owns</div>
+
+  <script>
+    const element_properties = [
+      ['ariaActiveDescendantElement', 'activedescendant']];
+    const array_properties = [
+      ['ariaControlsElements', 'controls'],
+      ['ariaDescribedByElements', 'describedby'],
+      ['ariaDetailsElements', 'details'],
+      ['ariaErrorMessageElements', 'errormessage'],
+      ['ariaFlowToElements', 'flowto'],
+      ['ariaLabelledByElements', 'labelledby'],
+      ['ariaOwnsElements', 'owns']];
+
+    test(t => {
+      const custom = document.getElementById('custom1');
+      for (const [property, id] of element_properties) {
+        assert_equals(custom.i[property], null);
+      }
+      for (const [property, id] of array_properties) {
+        assert_equals(custom.i[property], null);
+      }
+    }, "Getting previously-unset ARIA element reflection properties on ElementInternals should return null.");
+
+    test(t => {
+      const custom = document.getElementById('custom1');
+      for (const [property, id] of element_properties) {
+        const related = document.getElementById(id);
+        custom.i[property] = related;
+        assert_equals(custom.i[property], related);
+      }
+      for (const [property, id] of array_properties) {
+        const related = document.getElementById(id);
+        custom.i[property] = [related];
+        assert_array_equals(custom.i[property], [related]);
+      }
+    }, "Getting ARIA element reflection properties on ElementInternals should return the value that was set.");
+
+    test(t => {
+      const custom = document.getElementById('custom1');
+      for (const [property, id] of array_properties) {
+        custom.i[property] = [];
+        assert_array_equals(custom.i[property], []);
+      }
+    }, "Setting ARIA element reflection properties to an empty array should work as expected.");
+
+    test(t => {
+      const custom = document.getElementById('custom1');
+      for (const [property, id] of element_properties) {
+        const related = document.getElementById(id);
+        custom.i[property] = related;
+        assert_equals(custom.i[property], related);
+
+        custom.i[property] = null;
+        assert_equals(custom.i[property], null);
+      }
+      for (const [property, id] of array_properties) {
+        const related = document.getElementById(id);
+        custom.i[property] = [related];
+        assert_array_equals(custom.i[property], [related]);
+
+        custom.i[property] = null;
+        assert_equals(custom.i[property], null);
+      }
+    }, "Setting ARIA element reflection properties on ElementInternals to null should delete any previous value, and not crash");
+  </script>
+
+  <custom-element id="cachingInvariantMain"></custom-element>
+  <div id="cachingInvariantElement1"></div>
+  <div id="cachingInvariantElement2"></div>
+  <div id="cachingInvariantElement3"></div>
+  <div id="cachingInvariantElement4"></div>
+  <div id="cachingInvariantElement5"></div>
+
+  <script>
+    test(function(t) {
+      cachingInvariantMain.i.ariaControlsElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain.i.ariaDescribedByElements = [cachingInvariantElement3, cachingInvariantElement4];
+      cachingInvariantMain.i.ariaDetailsElements = [cachingInvariantElement5];
+      cachingInvariantMain.i.ariaFlowToElements = [cachingInvariantElement1, cachingInvariantElement3];
+      cachingInvariantMain.i.ariaLabelledByElements = [cachingInvariantElement2, cachingInvariantElement4];
+      cachingInvariantMain.i.ariaOwnsElements = [cachingInvariantElement1, cachingInvariantElement2, cachingInvariantElement3];
+
+      let ariaControlsElementsArray = cachingInvariantMain.i.ariaControlsElements;
+      let ariaDescribedByElementsArray = cachingInvariantMain.i.ariaDescribedByElements;
+      let ariaDetailsElementsArray = cachingInvariantMain.i.ariaDetailsElements;
+      let ariaFlowToElementsArray = cachingInvariantMain.i.ariaFlowToElements;
+      let ariaLabelledByElementsArray = cachingInvariantMain.i.ariaLabelledByElements;
+      let ariaOwnsElementsArray = cachingInvariantMain.i.ariaOwnsElements;
+
+      assert_equals(ariaControlsElementsArray, cachingInvariantMain.i.ariaControlsElements, "Caching invariant for ariaControlsElements");
+      assert_equals(ariaDescribedByElementsArray, cachingInvariantMain.i.ariaDescribedByElements, "Caching invariant for ariaDescribedByElements");
+      assert_equals(ariaDetailsElementsArray, cachingInvariantMain.i.ariaDetailsElements, "Caching invariant for ariaDetailsElements");
+      assert_equals(ariaFlowToElementsArray, cachingInvariantMain.i.ariaFlowToElements, "Caching invariant for ariaFlowToElements");
+      assert_equals(ariaLabelledByElementsArray, cachingInvariantMain.i.ariaLabelledByElements, "Caching invariant for ariaLabelledByElements");
+      assert_equals(ariaOwnsElementsArray, cachingInvariantMain.i.ariaOwnsElements, "Caching invariant for ariaOwnsElements");
+
+      // Ensure that cached values don't become stale
+      cachingInvariantMain.i.ariaControlsElements = [cachingInvariantElement4, cachingInvariantElement5];
+      cachingInvariantMain.i.ariaDescribedByElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain.i.ariaDetailsElements = [cachingInvariantElement3];
+      cachingInvariantMain.i.ariaFlowToElements = [cachingInvariantElement4, cachingInvariantElement5];
+      cachingInvariantMain.i.ariaLabelledByElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain.i.ariaOwnsElements = [cachingInvariantElement3, cachingInvariantElement4, cachingInvariantElement1];
+
+      ariaControlsElementsArray = cachingInvariantMain.i.ariaControlsElements;
+      ariaDescribedByElementsArray = cachingInvariantMain.i.ariaDescribedByElements;
+      ariaDetailsElementsArray = cachingInvariantMain.i.ariaDetailsElements;
+      ariaFlowToElementsArray = cachingInvariantMain.i.ariaFlowToElements;
+      ariaLabelledByElementsArray = cachingInvariantMain.i.ariaLabelledByElements;
+      ariaOwnsElementsArray = cachingInvariantMain.i.ariaOwnsElements;
+
+      assert_equals(ariaControlsElementsArray, cachingInvariantMain.i.ariaControlsElements, "Caching invariant for ariaControlsElements");
+      assert_equals(ariaDescribedByElementsArray, cachingInvariantMain.i.ariaDescribedByElements, "Caching invariant for ariaDescribedByElements");
+      assert_equals(ariaDetailsElementsArray, cachingInvariantMain.i.ariaDetailsElements, "Caching invariant for ariaDetailsElements");
+      assert_equals(ariaFlowToElementsArray, cachingInvariantMain.i.ariaFlowToElements, "Caching invariant for ariaFlowToElements");
+      assert_equals(ariaLabelledByElementsArray, cachingInvariantMain.i.ariaLabelledByElements, "Caching invariant for ariaLabelledByElements");
+      assert_equals(ariaOwnsElementsArray, cachingInvariantMain.i.ariaOwnsElements, "Caching invariant for ariaOwnsElements");
+
+    }, "Caching invariant different attributes.");
+  </script>
+
+  <custom-element id="cachingInvariantMain1"></custom-element>
+  <custom-element id="cachingInvariantMain2"></custom-element>
+
+  <script>
+    test(function(t) {
+      cachingInvariantMain1.i.ariaDescribedByElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain2.i.ariaDescribedByElements = [cachingInvariantElement1, cachingInvariantElement2];
+
+      let ariaDescribedByElementsArray1 = cachingInvariantMain1.i.ariaDescribedByElements;
+      let ariaDescribedByElementsArray2 = cachingInvariantMain2.i.ariaDescribedByElements;
+
+      assert_equals(ariaDescribedByElementsArray1, cachingInvariantMain1.i.ariaDescribedByElements, "Caching invariant for ariaDescribedByElements in one elemnt");
+      assert_equals(ariaDescribedByElementsArray2, cachingInvariantMain2.i.ariaDescribedByElements, "Caching invariant for ariaDescribedByElements in onother elemnt");
+      assert_not_equals(cachingInvariantMain1.i.ariaDescribedByElements, cachingInvariantMain2.i.ariaDescribedByElements);
+    }, "Caching invariant different elements.");
+  </script>
+
+  </script>
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/custom-elements/state/tentative/ElementInternals-states.html b/tests/wpt/tests/custom-elements/state/ElementInternals-states.html
similarity index 92%
rename from tests/wpt/tests/custom-elements/state/tentative/ElementInternals-states.html
rename to tests/wpt/tests/custom-elements/state/ElementInternals-states.html
index 016a2bcc438..1521a8098a3 100644
--- a/tests/wpt/tests/custom-elements/state/tentative/ElementInternals-states.html
+++ b/tests/wpt/tests/custom-elements/state/ElementInternals-states.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<link rel=help href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script>
@@ -27,6 +28,8 @@ test(() => {
 test(() => {
   let i = (new TestElement()).internals;
   assert_throws_js(TypeError, () => { i.states.supports('foo'); });
+  i.states.add(''); // should not throw.
+  i.states.add('--a\tb'); // should not throw.
 }, 'CustomStateSet behavior of ElementInternals.states: Exceptions');
 
 test(() => {
diff --git a/tests/wpt/tests/custom-elements/state/META.yml b/tests/wpt/tests/custom-elements/state/META.yml
new file mode 100644
index 00000000000..df335b339e1
--- /dev/null
+++ b/tests/wpt/tests/custom-elements/state/META.yml
@@ -0,0 +1 @@
+spec: https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class
diff --git a/tests/wpt/tests/custom-elements/state/README.md b/tests/wpt/tests/custom-elements/state/README.md
new file mode 100644
index 00000000000..4104881e039
--- /dev/null
+++ b/tests/wpt/tests/custom-elements/state/README.md
@@ -0,0 +1,2 @@
+Tests for [Custom State Pseudo
+Class](https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class)
diff --git a/tests/wpt/tests/custom-state-pseudo-class/custom-state-set-strong-ref.tentative.html b/tests/wpt/tests/custom-elements/state/custom-state-set-strong-ref.html
similarity index 90%
rename from tests/wpt/tests/custom-state-pseudo-class/custom-state-set-strong-ref.tentative.html
rename to tests/wpt/tests/custom-elements/state/custom-state-set-strong-ref.html
index 8b31f83c7b0..da25943ffa2 100644
--- a/tests/wpt/tests/custom-state-pseudo-class/custom-state-set-strong-ref.tentative.html
+++ b/tests/wpt/tests/custom-elements/state/custom-state-set-strong-ref.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8">
     <meta name="timeout" content="long">
     <meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
-    <link rel="help" href="https://wicg.github.io/custom-state-pseudo-class/" />
+    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
     <title>CustomStateSet doesn't crash after GC on detached node</title>
 
     <script src="/resources/testharness.js"></script>
diff --git a/tests/wpt/tests/custom-state-pseudo-class/state-css-selector-shadow-dom.tentative.html b/tests/wpt/tests/custom-elements/state/state-css-selector-shadow-dom.html
similarity index 95%
rename from tests/wpt/tests/custom-state-pseudo-class/state-css-selector-shadow-dom.tentative.html
rename to tests/wpt/tests/custom-elements/state/state-css-selector-shadow-dom.html
index 62bc9cf9484..9d86b5d2603 100644
--- a/tests/wpt/tests/custom-state-pseudo-class/state-css-selector-shadow-dom.tentative.html
+++ b/tests/wpt/tests/custom-elements/state/state-css-selector-shadow-dom.html
@@ -8,7 +8,7 @@
       title="Keith Cirkel"
       href="mailto:wpt@keithcirkel.co.uk"
     />
-    <link rel="help" href="https://wicg.github.io/custom-state-pseudo-class/" />
+    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
     <title>:state() css selector applies in shadow roots</title>
 
     <script src="/resources/testharness.js"></script>
diff --git a/tests/wpt/tests/custom-state-pseudo-class/state-css-selector.tentative.html b/tests/wpt/tests/custom-elements/state/state-css-selector.html
similarity index 97%
rename from tests/wpt/tests/custom-state-pseudo-class/state-css-selector.tentative.html
rename to tests/wpt/tests/custom-elements/state/state-css-selector.html
index dd08442e5eb..d29c9272234 100644
--- a/tests/wpt/tests/custom-state-pseudo-class/state-css-selector.tentative.html
+++ b/tests/wpt/tests/custom-elements/state/state-css-selector.html
@@ -4,7 +4,7 @@
     <meta charset="utf-8">
     <meta name="timeout" content="long">
     <meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
-    <link rel="help" href="https://wicg.github.io/custom-state-pseudo-class/" />
+    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
     <title>:state() css selector applies</title>
 
     <script src="/resources/testharness.js"></script>
diff --git a/tests/wpt/tests/custom-elements/state/tentative/state-pseudo-class.html b/tests/wpt/tests/custom-elements/state/state-pseudo-class.html
similarity index 84%
rename from tests/wpt/tests/custom-elements/state/tentative/state-pseudo-class.html
rename to tests/wpt/tests/custom-elements/state/state-pseudo-class.html
index 5ef526eb12c..4e2ee0b7790 100644
--- a/tests/wpt/tests/custom-elements/state/tentative/state-pseudo-class.html
+++ b/tests/wpt/tests/custom-elements/state/state-pseudo-class.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<link rel=help href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <style>
@@ -11,7 +12,7 @@
 #state-and-part:state(outerFoo)::part(inner) {
   opacity: 0.25;
 }
-:state(--\)escaped\ state) {}
+:state( \(escaped\ state  ) {}
 </style>
 <body>
 <script>
@@ -60,22 +61,29 @@ test(() => {
   document.querySelector(':state(--16px)');
 }, ':state() parsing passes');
 
+test(() => {
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state'); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state('); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state()'); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state(=)'); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state(name=value)'); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state( foo bar)'); });
+  assert_throws_dom('SyntaxError', () => { document.querySelector(':state(16px)'); });
+}, ':state() parsing failures');
+
 test(() => {
   assert_throws_dom('SyntaxError', () => { document.querySelector(':--('); });
   assert_throws_dom('SyntaxError', () => { document.querySelector(':--()'); });
-  assert_throws_dom('SyntaxError', () => { document.querySelector(':state()'); });
   assert_throws_dom('SyntaxError', () => { document.querySelector(':--)'); });
   assert_throws_dom('SyntaxError', () => { document.querySelector(':--='); });
   assert_throws_dom('SyntaxError', () => { document.querySelector(':--name=value'); });
-  assert_throws_dom('SyntaxError', () => { document.querySelector(':state(--name=value'); });
-  assert_throws_dom('SyntaxError', () => { document.querySelector(':state(--name=value)'); });
-}, ':state() parsing failures');
+}, 'deprecated :--state parsing failures');
 
 test(() => {
   assert_equals(document.styleSheets[0].cssRules[1].cssText,
       '#state-and-part::part(inner):state(innerFoo) { opacity: 0.5; }');
   assert_equals(document.styleSheets[0].cssRules[3].selectorText,
-      ':state(--\\)escaped\\ state)');
+      ':state(\\(escaped\\ state)');
 }, ':state(foo) serialization');
 
 test(() => {
@@ -112,13 +120,13 @@ test(() => {
   let inner = outer.innerElement;
   let innerStates = inner.i.states;
 
-  innerStates.add(':state(innerFoo)');
+  innerStates.add('innerFoo');
   assert_equals(getComputedStyle(inner).opacity, '0.5',
-      '::part() followed by :state(innerFoo)');
+      '::part() followed by :state()');
   innerStates.delete('innerFoo');
   innerStates.add('innerfoo');
   assert_equals(getComputedStyle(inner).opacity, '0',
-      ':state(foo) matching should be case-sensitive');
+      ':state() matching should be case-sensitive');
   innerStates.delete('innerfoo');
 
   outer.i.states.add('outerFoo');
diff --git a/tests/wpt/tests/custom-elements/state/tentative/README.md b/tests/wpt/tests/custom-elements/state/tentative/README.md
deleted file mode 100644
index b11784bd07e..00000000000
--- a/tests/wpt/tests/custom-elements/state/tentative/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Tests for [Custom State Pseudo Class](https://wicg.github.io/custom-state-pseudo-class/)
diff --git a/tests/wpt/tests/custom-state-pseudo-class/META.yml b/tests/wpt/tests/custom-state-pseudo-class/META.yml
deleted file mode 100644
index ee34d8b9004..00000000000
--- a/tests/wpt/tests/custom-state-pseudo-class/META.yml
+++ /dev/null
@@ -1 +0,0 @@
-spec: https://wicg.github.io/custom-state-pseudo-class/
diff --git a/tests/wpt/tests/custom-state-pseudo-class/idlharness.window.js b/tests/wpt/tests/custom-state-pseudo-class/idlharness.window.js
deleted file mode 100644
index d5d40c54616..00000000000
--- a/tests/wpt/tests/custom-state-pseudo-class/idlharness.window.js
+++ /dev/null
@@ -1,20 +0,0 @@
-// META: script=/resources/WebIDLParser.js
-// META: script=/resources/idlharness.js
-
-'use strict';
-
-class MyElement extends HTMLElement {};
-customElements.define('my-element', MyElement);
-
-idl_test(
-  ['custom-state-pseudo-class'],
-  ['html', 'wai-aria'],
-  idl_array => {
-    idl_array.add_objects({
-      CustomStateSet: [ 'customStateSet' ],
-    });
-
-    const myElement = document.createElement('my-element');
-    self.customStateSet = myElement.attachInternals().states;
-  }
-);
diff --git a/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-to-window.html b/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-to-window.html
index faacf7e572c..d2fd6f4d315 100644
--- a/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-to-window.html
+++ b/tests/wpt/tests/dom/events/scrolling/scrollend-event-fired-to-window.html
@@ -48,14 +48,14 @@
       assert_equals(document.scrollingElement.scrollTop, 0,
         "document should not be scrolled");
 
-      let scrollend_promise = waitForScrollendEvent(t, target_div);
+      let scrollend_promise = waitForScrollendEventNoTimeout(target_div);
       let max_target_div_scroll_top = target_div.scrollHeight - target_div.clientHeight;
       target_div.scrollTo({ top: target_div.scrollHeight, left: 0 });
       await scrollend_promise;
       assert_approx_equals(target_div.scrollTop, max_target_div_scroll_top, 1,
         "target_div should be fully scrolled down");
 
-      scrollend_promise = waitForScrollendEvent(t, window, 2000);
+      scrollend_promise = waitForScrollendEventNoTimeout(window);
       target_div.addEventListener("scrollend", fail);
       // Scroll up on target div and wait for the doc to get scrollend event.
       await scrollElementDown(target_div, target_div.clientHeight + 25);
diff --git a/tests/wpt/tests/dom/events/scrolling/scrollend-event-not-fired-on-no-scroll.html b/tests/wpt/tests/dom/events/scrolling/scrollend-event-not-fired-on-no-scroll.html
index eaa345aee92..870e15546f5 100644
--- a/tests/wpt/tests/dom/events/scrolling/scrollend-event-not-fired-on-no-scroll.html
+++ b/tests/wpt/tests/dom/events/scrolling/scrollend-event-not-fired-on-no-scroll.html
@@ -80,14 +80,14 @@
                         scrolling_element.clientHeight);
     assert_equals(scrolling_element.scrollTop, 0);
 
-    let scrollend_promise = waitForScrollendEvent(test, listening_element);
-    await upwardScroll(scrolling_element, button_element, scroll_type);
-    await scrollend_promise.then(
+    let scrollend_promise = waitForScrollendEvent(test, listening_element).then(
       (/*resolve*/) => {
         assert_true(false, "no scroll, so no scrollend expected");
       },
       (/*reject*/) => { /* Did not see scrollend, which is okay. */ }
     );
+    await upwardScroll(scrolling_element, button_element, scroll_type);
+    await scrollend_promise;
   }
 
   function runTest() {
diff --git a/tests/wpt/tests/dom/observable/tentative/idlharness.html b/tests/wpt/tests/dom/observable/tentative/idlharness.html
new file mode 100644
index 00000000000..9a3842c4e67
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/idlharness.html
@@ -0,0 +1,20 @@
+<!doctype html>
+  <meta charset="utf-8" />
+  <meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+  <link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+  <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>
+    idl_test(["observable.tentative"], ["dom"], (idl_array) => {
+      idl_array.add_objects({
+        Observable: ["new Observable(() => {})"],
+        Subscriber: [
+          "(() => { let s = null; new Observable(_s => s = _s).subscribe({}); return s })()",
+        ],
+      });
+    });
+  </script>
+</t>
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
index 2f3f6a0be5a..f108e902b32 100644
--- a/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
+++ b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
@@ -12,23 +12,6 @@ test(() => {
   assert_throws_js(TypeError, () => { new Observable(); });
 }, "Observable constructor");
 
-test(() => {
-  assert_implements(self.Subscriber, "The Subscriber interface is not implemented");
-  assert_true(
-    typeof Subscriber === "function",
-    "Subscriber interface is defined as a function"
-  );
-
-  assert_throws_js(TypeError, () => { new Subscriber(); });
-
-  new Observable(subscriber => {
-    assert_not_equals(subscriber, undefined, "A Subscriber must be passed into the subscribe callback");
-    assert_implements(subscriber.next, "A Subscriber object must have a next() method");
-    assert_implements(subscriber.complete, "A Subscriber object must have a complete() method");
-    assert_implements(subscriber.error, "A Subscriber object must have an error() method");
-  }).subscribe();
-}, "Subscriber interface is not constructible");
-
 test(() => {
   let initializerCalled = false;
   const source = new Observable(() => {
@@ -43,6 +26,26 @@ test(() => {
   assert_true(initializerCalled, "initializer should be called by subscribe");
 }, "subscribe() can be called with no arguments");
 
+test(() => {
+  assert_implements(self.Subscriber, "The Subscriber interface is not implemented");
+  assert_true(
+    typeof Subscriber === "function",
+    "Subscriber interface is defined as a function"
+  );
+
+  assert_throws_js(TypeError, () => { new Subscriber(); });
+
+  let initializerCalled = false;
+  new Observable(subscriber => {
+    assert_not_equals(subscriber, undefined, "A Subscriber must be passed into the subscribe callback");
+    assert_implements(subscriber.next, "A Subscriber object must have a next() method");
+    assert_implements(subscriber.complete, "A Subscriber object must have a complete() method");
+    assert_implements(subscriber.error, "A Subscriber object must have an error() method");
+    initializerCalled = true;
+  }).subscribe();
+  assert_true(initializerCalled, "initializer should be called by subscribe");
+}, "Subscriber interface is not constructible");
+
 test(() => {
   let initializerCalled = false;
   const results = [];
@@ -123,6 +126,51 @@ test(() => {
   );
 }, "Observable error path called synchronously");
 
+test(() => {
+  let subscriber;
+  new Observable(s => { subscriber = s }).subscribe();
+  const {next, complete, error} = subscriber;
+  assert_throws_js(TypeError, () => next(1));
+  assert_throws_js(TypeError, () => complete());
+  assert_throws_js(TypeError, () => error(1));
+}, "Subscriber must have receiver");
+
+test(() => {
+  let subscriber;
+  new Observable(s => { subscriber = s }).subscribe();
+  assert_throws_js(TypeError, () => subscriber.next());
+  assert_throws_js(TypeError, () => subscriber.error());
+}, "Subscriber next & error must recieve argument");
+
+test(() => {
+  let subscriber;
+  new Observable(s => { subscriber = s }).subscribe();
+  assert_true(subscriber.active);
+  assert_false(subscriber.signal.aborted);
+  subscriber.complete();
+  assert_false(subscriber.active);
+  assert_true(subscriber.signal.aborted);
+}, "Subscriber complete() will set active to false, and abort signal");
+
+test(() => {
+  let subscriber;
+  new Observable(s => { subscriber = s }).subscribe();
+  assert_true(subscriber.active);
+  subscriber.active = false;
+  assert_true(subscriber.active);
+}, "Subscriber active is readonly");
+
+test(() => {
+  let subscriber;
+  new Observable(s => { subscriber = s }).subscribe();
+  assert_false(subscriber.signal.aborted);
+  const oldSignal = subscriber.signal;
+  const newSignal = AbortSignal.abort();
+  subscriber.signal = newSignal;
+  assert_false(subscriber.signal.aborted);
+  assert_equals(subscriber.signal, oldSignal, "signal did not change");
+}, "Subscriber signal is readonly");
+
 test(() => {
   const error = new Error("error");
   const results = [];
@@ -168,37 +216,68 @@ test(() => {
 
 test(t => {
   let innerSubscriber = null;
+  let activeBeforeComplete = false;
   let activeAfterComplete = false;
   let activeDuringComplete = false;
+  let abortedBeforeComplete = false;
+  let abortedDuringComplete = false;
+  let abortedAfterComplete = false;
 
   const source = new Observable((subscriber) => {
     innerSubscriber = subscriber;
+    activeBeforeComplete = subscriber.active;
+    abortedBeforeComplete = subscriber.signal.aborted;
 
     subscriber.complete();
     activeAfterComplete = subscriber.active;
+    abortedAfterComplete = subscriber.signal.aborted;
   });
 
-  source.subscribe({complete: () => activeDuringComplete = innerSubscriber.active});
+  source.subscribe({
+    complete: () => {
+      activeDuringComplete = innerSubscriber.active
+      abortedDuringComplete = innerSubscriber.active
+    }
+  });
+  assert_true(activeBeforeComplete, "Subscription is active before complete");
+  assert_false(abortedBeforeComplete, "Subscription is not aborted before complete");
   assert_false(activeDuringComplete, "Subscription is not active during complete");
+  assert_false(abortedDuringComplete, "Subscription is not aborted during complete");
   assert_false(activeAfterComplete, "Subscription is not active after complete");
+  assert_true(abortedAfterComplete, "Subscription is aborted after complete");
 }, "Subscription is inactive after complete()");
 
 test(t => {
   let innerSubscriber = null;
+  let activeBeforeError = false;
   let activeAfterError = false;
   let activeDuringError = false;
+  let abortedBeforeError = false;
+  let abortedDuringError = false;
+  let abortedAfterError = false;
 
   const error = new Error("error");
   const source = new Observable((subscriber) => {
     innerSubscriber = subscriber;
+    activeBeforeError = subscriber.active;
+    abortedBeforeError = subscriber.signal.aborted;
 
     subscriber.error(error);
     activeAfterError = subscriber.active;
+    abortedAfterError = subscriber.signal.aborted;
   });
 
-  source.subscribe({error: () => activeDuringError = innerSubscriber.active});
+  source.subscribe({
+    error: () => {
+      activeDuringError = innerSubscriber.active
+    }
+  });
+  assert_true(activeBeforeError, "Subscription is active before error");
+  assert_false(abortedBeforeError, "Subscription is not aborted before error");
   assert_false(activeDuringError, "Subscription is not active during error");
+  assert_false(abortedDuringError, "Subscription is not aborted during error");
   assert_false(activeAfterError, "Subscription is not active after error");
+  assert_true(abortedAfterError, "Subscription is not aborted after error");
 }, "Subscription is inactive after error()");
 
 test(t => {
@@ -284,9 +363,7 @@ test(() => {
     subscriber.next(1);
     subscriber.next(2);
     subscriber.error(error);
-    // TODO(https://github.com/WICG/observable/issues/76): Assert
-    // `subscriber.closed` is true, if we add that attribute.
-    // assert_true(subscriber.closed, "subscriber is closed after error");
+    assert_false(subscriber.active, "subscriber is closed after error");
     subscriber.next(3);
     subscriber.complete();
   });
@@ -551,30 +628,39 @@ test(() => {
   );
 }, "Subscriber#error() cannot re-entrantly invoke itself");
 
-// TODO(domfarolino): Once `Subscriber#addTeardown()` and `Subscriber#active`
-// are implemented, add corresponding code for them here so we can assert the following order of everything:
-//   1. The passed-in `Observer#signal` is marked as `aborted`
-//   2. Abort event handlers are invoked for the that outer, passed-in signal.
-//   3. `Subscriber#closed` is true
-//   4. `Subscriber#signal` is marked as aborted
-//   5. Teardown callbacks are executed in the right order
-//   6. Abort event handlers are invoked for `Subscriber#signal`.
-// This ensures we have the "dependent signal" logic wired up correctly:
-// https://dom.spec.whatwg.org/#create-a-dependent-abort-signal.
 test(() => {
   const results = [];
   let innerSubscriber = null;
+  let activeDuringTeardown1 = null;
+  let abortedDuringTeardown1 = null;
+  let activeDuringTeardown2 = null;
+  let abortedDuringTeardown2 = null;
 
   const source = new Observable((subscriber) => {
+    assert_true(subscriber.active);
+    assert_false(subscriber.signal.aborted);
     results.push('subscribe() callback');
     innerSubscriber = subscriber;
 
     subscriber.signal.addEventListener('abort', () => {
+      assert_false(subscriber.active);
       assert_true(subscriber.signal.aborted);
       results.push('inner abort handler');
       subscriber.next('next from inner abort handler');
       subscriber.complete();
     });
+
+    subscriber.addTeardown(() => {
+      activeDuringTeardown1 = subscriber.active;
+      abortedDuringTeardown1 = subscriber.signal.aborted;
+      results.push('teardown 1');
+    });
+
+    subscriber.addTeardown(() => {
+      activeDuringTeardown2 = subscriber.active;
+      abortedDuringTeardown2 = subscriber.signal.aborted;
+      results.push('teardown 2');
+    });
   });
 
   const ac = new AbortController();
@@ -593,21 +679,28 @@ test(() => {
   assert_array_equals(results, ['subscribe() callback']);
   ac.abort();
   results.push('abort() returned');
-  assert_array_equals(results, ['subscribe() callback',
-      'outer abort handler', 'inner abort handler', 'abort() returned']);
+  assert_array_equals(results, [
+      'subscribe() callback',
+      'outer abort handler', 'teardown 2', 'teardown 1',
+      'inner abort handler', 'abort() returned',
+  ]);
+  assert_false(activeDuringTeardown1, 'should not be active during teardown callback 1');
+  assert_false(activeDuringTeardown2, 'should not be active during teardown callback 2');
+  assert_true(abortedDuringTeardown1, 'should be aborted during teardown callback 1');
+  assert_true(abortedDuringTeardown2, 'should be aborted during teardown callback 2');
 }, "Unsubscription lifecycle");
 
-// TODO(domfarolino): If we add `subscriber.closed`, assert that its value is
-// `true` in this test. See https://github.com/WICG/observable/issues/76.
 test(t => {
   const source = new Observable((subscriber) => {
     let n = 0;
     while (!subscriber.signal.aborted) {
+      assert_true(subscriber.active);
       subscriber.next(n++);
       if (n > 3) {
         assert_unreached("The subscriber should be closed by now");
       }
     }
+    assert_false(subscriber.active);
   });
 
   const ac = new AbortController();
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.any.js b/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.any.js
new file mode 100644
index 00000000000..6421777e09b
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.any.js
@@ -0,0 +1,324 @@
+// Because we test that the global error handler is called at various times.
+setup({allow_uncaught_exception: true});
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    let i = 0;
+    const interval = setInterval(() => {
+      if (i < 5) {
+        subscriber.next(++i);
+      } else {
+        subscriber.complete();
+        clearInterval(interval);
+      }
+    }, 0);
+  });
+
+  const result = await source.takeUntil(new Observable(() => {})).toArray();
+  assert_array_equals(result, [1, 2, 3, 4, 5]);
+}, "takeUntil subscribes to source Observable and mirrors it uninterrupted");
+
+promise_test(async () => {
+  const source = new Observable(() => {});
+  let notifierSubscribedTo = false;
+  const notifier = new Observable(() => notifierSubscribedTo = true);
+
+  source.takeUntil(notifier).subscribe();
+  assert_true(notifierSubscribedTo);
+}, "takeUntil subscribes to notifier");
+
+// This test is important because ordinarily, calling `subscriber.next()` does
+// not cancel a subscription associated with `subscriber`. However, for the
+// `takeUntil()` operator, the spec responds to `notifier`'s `next()` by
+// unsubscribing from `notifier`, which is what this test asserts.
+promise_test(async () => {
+  const source = new Observable(subscriber => {});
+
+  let notifierSubscriberActiveBeforeNext;
+  let notifierSubscriberActiveAfterNext;
+  let teardownCalledAfterNext;
+  let notifierSignalAbortedAfterNext;
+  const notifier = new Observable(subscriber => {
+    let teardownCalled;
+    subscriber.addTeardown(() => teardownCalled = true);
+
+    // Calling `next()` causes `takeUntil()` to unsubscribe from `notifier`.
+    notifierSubscriberActiveBeforeNext = subscriber.active;
+    subscriber.next('value');
+    notifierSubscriberActiveAfterNext = subscriber.active;
+    teardownCalledAfterNext = (teardownCalled === true);
+    notifierSignalAbortedAfterNext = subscriber.signal.aborted;
+  });
+
+  let nextOrErrorCalled = false;
+  let completeCalled = false;
+  source.takeUntil(notifier).subscribe({
+    next: () => nextOrErrorCalled = true,
+    error: () => nextOrErrorCalled = true,
+    complete: () => completeCalled = true,
+  });
+  assert_true(notifierSubscriberActiveBeforeNext);
+  assert_false(notifierSubscriberActiveAfterNext);
+  assert_true(teardownCalledAfterNext);
+  assert_true(notifierSignalAbortedAfterNext);
+  assert_false(nextOrErrorCalled);
+  assert_true(completeCalled);
+}, "takeUntil: notifier next() unsubscribes to notifier");
+
+// This test is identical to the one above, with the exception being that the
+// `notifier` calls `subscriber.error()` instead `subscriber.next()`.
+promise_test(async () => {
+  const source = new Observable(subscriber => {});
+
+  let notifierSubscriberActiveBeforeNext;
+  let notifierSubscriberActiveAfterNext;
+  let teardownCalledAfterNext;
+  let notifierSignalAbortedAfterNext;
+  const notifier = new Observable(subscriber => {
+    let teardownCalled;
+    subscriber.addTeardown(() => teardownCalled = true);
+
+    // Calling `next()` causes `takeUntil()` to unsubscribe from `notifier`.
+    notifierSubscriberActiveBeforeNext = subscriber.active;
+    subscriber.error('error');
+    notifierSubscriberActiveAfterNext = subscriber.active;
+    teardownCalledAfterNext = (teardownCalled === true);
+    notifierSignalAbortedAfterNext = subscriber.signal.aborted;
+  });
+
+  let nextOrErrorCalled = false;
+  let completeCalled = false;
+  source.takeUntil(notifier).subscribe({
+    next: () => nextOrErrorCalled = true,
+    error: () => nextOrErrorCalled = true,
+    complete: () => completeCalled = true,
+  });
+  assert_true(notifierSubscriberActiveBeforeNext);
+  assert_false(notifierSubscriberActiveAfterNext);
+  assert_true(teardownCalledAfterNext);
+  assert_true(notifierSignalAbortedAfterNext);
+  assert_false(nextOrErrorCalled);
+  assert_true(completeCalled);
+}, "takeUntil: notifier error() unsubscribes to notifier");
+
+// Test that `notifier` unsubscribes from source Observable.
+promise_test(async t => {
+  const results = [];
+
+  const source = new Observable(subscriber => {
+    results.push('source subscribed');
+    subscriber.addTeardown(() => results.push('source teardown'));
+    subscriber.signal.addEventListener('abort',
+        e => results.push('source signal abort'));
+  });
+
+  let notifierTeardownCalled = false;
+  const notifier = new Observable(subscriber => {
+    results.push('notifier subscribed');
+    subscriber.addTeardown(() => {
+      results.push('notifier teardown');
+      notifierTeardownCalled = true;
+    });
+    subscriber.signal.addEventListener('abort',
+        e => results.push('notifier signal abort'));
+
+    // Asynchronously shut everything down.
+    t.step_timeout(() => subscriber.next('value'));
+  });
+
+  let nextOrErrorCalled = false;
+  let notifierTeardownCalledBeforeCompleteCallback;
+  await new Promise(resolve => {
+    source.takeUntil(notifier).subscribe({
+      next: () => nextOrErrorCalled = true,
+      error: () => nextOrErrorCalled = true,
+      complete: () => {
+        notifierTeardownCalledBeforeCompleteCallback = notifierTeardownCalled;
+        resolve();
+      },
+    });
+  });
+
+  // The outer `Observer#complete()` callback is called before any teardowns are
+  // invoked.
+  assert_false(nextOrErrorCalled);
+  // The notifier/source teardowns are not called by the time the outer
+  // `Observer#complete()` callback is invoked, but they are all run *after*
+  // (i.e., before `notifier`'s `subscriber.next()` returns internally).
+  assert_false(notifierTeardownCalledBeforeCompleteCallback);
+  assert_true(notifierTeardownCalled);
+  assert_array_equals(results, [
+    "notifier subscribed",
+    "source subscribed",
+    "notifier teardown",
+    "notifier signal abort",
+    "source teardown",
+    "source signal abort"
+  ]);
+}, "takeUntil: notifier next() unsubscribes from notifier & source observable");
+
+// This test is almost identical to the above test, however instead of the
+// `notifier` Observable being the thing that causes the unsubscription from
+// `notifier` and `source`, it is the outer composite Observable's
+// `SubscribeOptions#signal` being aborted that does this.
+promise_test(async t => {
+  const results = [];
+  // This will get populated later with a function that resolves a promise.
+  let resolver;
+
+  const source = new Observable(subscriber => {
+    results.push('source subscribed');
+    subscriber.addTeardown(() => results.push('source teardown'));
+    subscriber.signal.addEventListener('abort', e => {
+      results.push('source signal abort');
+      // This should be the last thing run in the whole teardown sequence. After
+      // this, we can resolve the promise that this test is waiting on, via
+      // `resolver`. That'll wrap things up and move us on to the assertions.
+      resolver();
+    });
+  });
+
+  const notifier = new Observable(subscriber => {
+    results.push('notifier subscribed');
+    subscriber.addTeardown(() => {
+      results.push('notifier teardown');
+    });
+    subscriber.signal.addEventListener('abort',
+        e => results.push('notifier signal abort'));
+  });
+
+  let observerCallbackCalled = false;
+  await new Promise(resolve => {
+    resolver = resolve;
+    const controller = new AbortController();
+    source.takeUntil(notifier).subscribe({
+      next: () => observerCallbackCalled = true,
+      error: () => observerCallbackCalled = true,
+      complete: () => observerCallbackCalled = true,
+    }, {signal: controller.signal});
+
+    // Asynchronously shut everything down.
+    t.step_timeout(() => controller.abort());
+  });
+
+  assert_false(observerCallbackCalled);
+  assert_array_equals(results, [
+    "notifier subscribed",
+    "source subscribed",
+    "notifier teardown",
+    "notifier signal abort",
+    "source teardown",
+    "source signal abort"
+  ]);
+}, "takeUntil()'s AbortSignal unsubscribes from notifier & source observable");
+
+promise_test(async () => {
+  let sourceSubscribedTo = false;
+  const source = new Observable(subscriber => {
+    sourceSubscribedTo = true;
+  });
+
+  const notifier = new Observable(subscriber => subscriber.next('value'));
+
+  let nextOrErrorCalled = false;
+  let completeCalled = false;
+  const result = source.takeUntil(notifier).subscribe({
+    next: v => nextOrErrorCalled = true,
+    error: e => nextOrErrorCalled = true,
+    complete: () => completeCalled = true,
+  });
+
+  assert_false(sourceSubscribedTo);
+  assert_true(completeCalled);
+  assert_false(nextOrErrorCalled);
+}, "takeUntil: source never subscribed to when notifier synchronously emits a value");
+
+promise_test(async () => {
+  let sourceSubscribedTo = false;
+  const source = new Observable(subscriber => {
+    sourceSubscribedTo = true;
+  });
+
+  const notifier = new Observable(subscriber => subscriber.error('error'));
+
+  let nextOrErrorCalled = false;
+  let completeCalled = false;
+  const result = source.takeUntil(notifier).subscribe({
+    next: v => nextOrErrorCalled = true,
+    error: e => nextOrErrorCalled = true,
+    complete: () => completeCalled = true,
+  });
+
+  assert_false(sourceSubscribedTo);
+  assert_true(completeCalled);
+  assert_false(nextOrErrorCalled);
+}, "takeUntil: source never subscribed to when notifier synchronously emits error");
+
+promise_test(async () => {
+  const source = new Observable(subscriber => {
+    let i = 0;
+    const interval = setInterval(() => {
+      if (i < 5) {
+        subscriber.next(++i);
+      } else {
+        subscriber.complete();
+        clearInterval(interval);
+      }
+    }, 500);
+  });
+
+  const notifier = new Observable(subscriber => subscriber.complete());
+
+  const result = await source.takeUntil(notifier).toArray();
+  assert_array_equals(result, [1, 2, 3, 4, 5]);
+}, "takeUntil: source is uninterrupted when notifier completes, even synchronously");
+
+promise_test(async () => {
+  const results = [];
+
+  let sourceSubscriber;
+  let notifierSubscriber;
+  const source = new Observable(subscriber => sourceSubscriber = subscriber);
+  const notifier = new Observable(subscriber => notifierSubscriber = subscriber);
+
+  source.takeUntil(notifier).subscribe({
+    next: v => results.push(v),
+    complete: () => results.push("complete"),
+  });
+
+  sourceSubscriber.next(1);
+  sourceSubscriber.next(2);
+  notifierSubscriber.next('notifier value');
+  sourceSubscriber.next(3);
+
+  assert_array_equals(results, [1, 2, 'complete']);
+}, "takeUntil() mirrors the source Observable until its first next() value");
+
+promise_test(async t => {
+  let errorReported = null;
+
+  self.addEventListener("error", e => errorReported = e, { once: true });
+
+  const source = new Observable(() => {});
+  const notifier = new Observable(subscriber => {
+    t.step_timeout(() => {
+      subscriber.error('error 1');
+      subscriber.error('error 2');
+    });
+  });
+
+  let errorCallbackCalled = false;
+  await new Promise(resolve => {
+    source.takeUntil(notifier).subscribe({
+      error: e => errorCallbackCalled = true,
+      complete: () => resolve(),
+    });
+  });
+
+  assert_false(errorCallbackCalled);
+  assert_true(errorReported !== null, "Exception was reported to global");
+  assert_equals(errorReported.message, "Uncaught error 2", "Error message matches");
+  assert_greater_than(errorReported.lineno, 0, "Error lineno is greater than 0");
+  assert_greater_than(errorReported.colno, 0, "Error lineno is greater than 0");
+  assert_equals(errorReported.error, 'error 2', "Error object is equivalent (just a string)");
+}, "takeUntil: notifier calls `Subscriber#error()` twice; second goes to global error handler");
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.window.js b/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.window.js
new file mode 100644
index 00000000000..e4906d5f165
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-takeUntil.window.js
@@ -0,0 +1,61 @@
+async function loadIframeAndReturnContentWindow() {
+   // Create and attach an iframe.
+  const iframe = document.createElement('iframe');
+  const iframeLoadPromise = new Promise((resolve, reject) => {
+    iframe.onload = resolve;
+    iframe.onerror = reject;
+  });
+  document.body.append(iframe);
+  await iframeLoadPromise;
+  return iframe.contentWindow;
+}
+
+// This is a regression test to ensure there is no crash inside `takeUntil()`
+// once `notifier` detaches its document, before `source` is subscribed to.
+promise_test(async () => {
+  // Hang this off of the main document's global, so the child can easily reach
+  // it.
+  window.results = [];
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  contentWin.eval(`
+    const parentResults = parent.results;
+
+    const source = new Observable(() => parentResults.push('source subscribed'));
+    const notifier = new Observable(() => {
+      parentResults.push('notifier subscribed');
+
+      // Detach this child document.
+      window.frameElement.remove();
+      parentResults.push('notifier has detached document');
+    });
+
+    source.takeUntil(notifier).subscribe();
+  `);
+
+  assert_array_equals(results, ["notifier subscribed", "notifier has detached document"]);
+}, "takeUntil(): notifier Observable detaches document before source " +
+   "Observable would be subscribed to");
+
+promise_test(async () => {
+  window.results = [];
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  contentWin.eval(`
+    let completeSubscriber, errorSubscriber, notifierSubscriber;
+    const sourceComplete = new Observable(subscriber => completeSubscriber = subscriber);
+    const sourceError = new Observable(subscriber => errorSubscriber = subscriber);
+    const notifier = new Observable(subscriber => notifierSubscriber = subscriber);
+
+    sourceComplete.takeUntil(notifier).subscribe();
+    sourceError.takeUntil(notifier).subscribe();
+
+    // Detach this child document.
+    window.frameElement.remove();
+
+    completeSubscriber.complete();
+    errorSubscriber.error('error');
+    notifierSubscriber.error('error');
+  `);
+}, "takeUntil(): Source and notifier internal observers do not crash in a " +
+    "detached document");
diff --git a/tests/wpt/tests/editing/data/formatblock.js b/tests/wpt/tests/editing/data/formatblock.js
index bd559b30036..5cc040b1f13 100644
--- a/tests/wpt/tests/editing/data/formatblock.js
+++ b/tests/wpt/tests/editing/data/formatblock.js
@@ -1886,4 +1886,10 @@ var browserTests = [
     "<div><div contenteditable=\"false\"><div contenteditable=\"\"><div>[foo]</div></div></div></div>", // <div> can have <div>, so, wrap it with <div>
     [true],
     {"formatblock":[false,false,"",false,false,"div"]}],
+
+["<span style=display:block>abc</span><span style=display:block>[def]</span><span style=display:block>ghi</span>",
+    [["formatblock","div"]],
+    "<span style=\"display:block\">abc</span><div><span style=\"display:block\">def</span></div><span style=\"display:block\">ghi</span>",
+    [true],
+    {"formatblock":[false,false,"",false,false,"div"]}],
 ]
diff --git a/tests/wpt/tests/editing/data/insertparagraph.js b/tests/wpt/tests/editing/data/insertparagraph.js
index 7a5fe7158b2..0dace0105c3 100644
--- a/tests/wpt/tests/editing/data/insertparagraph.js
+++ b/tests/wpt/tests/editing/data/insertparagraph.js
@@ -2421,4 +2421,156 @@ var browserTests = [
     "<p><span contenteditable=\"false\">abc</span></p><p><br></p>",
     [true],
     {}],
+
+// When inserting paragraph under the editing host, new paragraph should be
+// created and unwrapped lines after the insertion point should be wrapped
+// into it at least.
+["foo<br>bar[]<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>bar<div><br><span contenteditable=\"false\">baz</span></div>",
+     "foo<br><div>bar</div><div><br><span contenteditable=\"false\">baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>bar[]<br><span>baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>bar<div><br><span>baz</span></div>",
+     "foo<br><div>bar</div><div><br><span>baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>bar[]<br><span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>bar<div><br><span contenteditable=\"false\">baz</span>qux</div>",
+     "foo<br><div>bar</div><div><br><span contenteditable=\"false\">baz</span>qux</div>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>ba<div>r<br><span contenteditable=\"false\">baz</span></div>",
+     "foo<br><div>ba</div><div>r<br><span contenteditable=\"false\">baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span>baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>ba<div>r<br><span>baz</span></div>",
+     "foo<br><div>ba</div><div>r<br><span>baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br>ba<div>r<br><span contenteditable=\"false\">baz</span>qux</div>",
+     "foo<br><div>ba</div><div>r<br><span contenteditable=\"false\">baz</span>qux</div>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br><br><div>bar<br><span contenteditable=\"false\">baz</span></div>",
+     "foo<br><div><br></div><div>bar<br><span contenteditable=\"false\">baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<br><span>baz</span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br><br><div>bar<br><span>baz</span></div>",
+     "foo<br><div><br></div><div>bar<br><span>baz</span></div>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br><br><div>bar<span contenteditable=\"false\">baz</span>qux</div>",
+     "foo<br><div><br></div><div>bar<span contenteditable=\"false\">baz</span>qux</div>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span contenteditable=\"false\">baz</span><br>qux",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br><br><div>bar<span contenteditable=\"false\">baz</span><br>qux</div>",
+     "foo<br><div><br></div><div>bar<span contenteditable=\"false\">baz</span><br>qux</div>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span>baz</span><br>qux",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["foo<br><br><div>bar<span>baz</span><br>qux</div>",
+     "foo<br><div><br></div><div>bar<span>baz</span><br>qux</div>"],
+    [true,true],
+    {}],
+// And the new paragraph should be the default paragraph.
+["foo<br>bar[]<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>bar<p><br><span contenteditable=\"false\">baz</span></p>",
+     "foo<br><p>bar</p><p><br><span contenteditable=\"false\">baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>bar[]<br><span>baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>bar<p><br><span>baz</span></p>",
+     "foo<br><p>bar</p><p><br><span>baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>bar[]<br><span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>bar<p><br><span contenteditable=\"false\">baz</span>qux</p>",
+     "foo<br><p>bar</p><p><br><span contenteditable=\"false\">baz</span>qux</p>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>ba<p>r<br><span contenteditable=\"false\">baz</span></p>",
+     "foo<br><p>ba</p><p>r<br><span contenteditable=\"false\">baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span>baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>ba<p>r<br><span>baz</span></p>",
+     "foo<br><p>ba</p><p>r<br><span>baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>ba[]r<br><span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br>ba<p>r<br><span contenteditable=\"false\">baz</span>qux</p>",
+     "foo<br><p>ba</p><p>r<br><span contenteditable=\"false\">baz</span>qux</p>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<br><span contenteditable=\"false\">baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br><br><p>bar<br><span contenteditable=\"false\">baz</span></p>",
+     "foo<br><p><br></p><p>bar<br><span contenteditable=\"false\">baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<br><span>baz</span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br><br><p>bar<br><span>baz</span></p>",
+     "foo<br><p><br></p><p>bar<br><span>baz</span></p>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span contenteditable=\"false\">baz</span>qux",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br><br><p>bar<span contenteditable=\"false\">baz</span>qux</p>",
+     "foo<br><p><br></p><p>bar<span contenteditable=\"false\">baz</span>qux</p>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span contenteditable=\"false\">baz</span><br>qux",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br><br><p>bar<span contenteditable=\"false\">baz</span><br>qux</p>",
+     "foo<br><p><br></p><p>bar<span contenteditable=\"false\">baz</span><br>qux</p>"],
+    [true,true],
+    {}],
+["foo<br>[]bar<span>baz</span><br>qux",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["foo<br><br><p>bar<span>baz</span><br>qux</p>",
+     "foo<br><p><br></p><p>bar<span>baz</span><br>qux</p>"],
+    [true,true],
+    {}],
+
+// Inserting paragraph before <br> followed by a blocked <span> should cause
+// inserting an empty paragraph to start of the editing host at least.
+["{}<br><span style=display:block>abc<br>def<br></span>",
+    [["defaultparagraphseparator","div"],["insertparagraph",""]],
+    ["<div><br></div><br><span style=\"display:block\">abc<br>def<br></span>",
+     "<div><br></div><div><br></div><span style=\"display:block\">abc<br>def<br></span>"],
+    [true,true],
+    {}],
+["{}<br><span style=display:block>abc<br>def<br></span>",
+    [["defaultparagraphseparator","p"],["insertparagraph",""]],
+    ["<p><br></p><br><span style=\"display:block\">abc<br>def<br></span>",
+     "<p><br></p><p><br></p><span style=\"display:block\">abc<br>def<br></span>"],
+    [true,true],
+    {}],
 ]
diff --git a/tests/wpt/tests/editing/edit-context/edit-context-basics.tentative.html b/tests/wpt/tests/editing/edit-context/edit-context-basics.tentative.html
index 54d49dab4a6..78b6824921a 100644
--- a/tests/wpt/tests/editing/edit-context/edit-context-basics.tentative.html
+++ b/tests/wpt/tests/editing/edit-context/edit-context-basics.tentative.html
@@ -126,6 +126,23 @@
       assert_equals(editContext.selectionEnd, 1);
       editContext.updateControlBounds(viewRect);
       editContext.updateSelectionBounds(caretRect);
+      editContext.updateCharacterBounds(0, [caretRect]);
+
+      assert_throws_js(TypeError, function() { editContext.updateControlBounds(42); });
+      assert_throws_js(TypeError, function() { editContext.updateSelectionBounds(42); });
+      assert_throws_js(TypeError, function() { editContext.updateControlBounds(undefined); });
+      assert_throws_js(TypeError, function() { editContext.updateSelectionBounds(undefined); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds(0); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds([caretRect]); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds(0, caretRect); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds(0, 42); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds(0, undefined); });
+      assert_throws_js(TypeError, function() { editContext.updateCharacterBounds(0, [undefined]); });
+
+      viewRect.x = viewRect.y = viewRect.width = viewRect.height = undefined;
+      editContext.updateControlBounds(viewRect);
+      editContext.updateSelectionBounds(viewRect);
+      editContext.updateCharacterBounds(0, [viewRect]);
     }, 'Testing EditContext update text, selection and layout');
 
     test(function() {
diff --git a/tests/wpt/tests/editing/run/formatblock.html b/tests/wpt/tests/editing/run/formatblock.html
index f15f2c03dac..03b5a651273 100644
--- a/tests/wpt/tests/editing/run/formatblock.html
+++ b/tests/wpt/tests/editing/run/formatblock.html
@@ -5,7 +5,8 @@
 <meta name="variant" content="?1001-2000">
 <meta name="variant" content="?2001-3000">
 <meta name="variant" content="?3001-4000">
-<meta name="variant" content="?4001-last">
+<meta name="variant" content="?4001-5000">
+<meta name="variant" content="?5001-last">
 <link rel=stylesheet href=../include/reset.css>
 <title>formatblock - HTML editing conformance tests</title>
 
diff --git a/tests/wpt/tests/editing/run/insertparagraph.html b/tests/wpt/tests/editing/run/insertparagraph.html
index 56b5335ea7e..ef67bcfe8ba 100644
--- a/tests/wpt/tests/editing/run/insertparagraph.html
+++ b/tests/wpt/tests/editing/run/insertparagraph.html
@@ -7,7 +7,8 @@
 <meta name="variant" content="?3001-4000">
 <meta name="variant" content="?4001-5000">
 <meta name="variant" content="?5001-6000">
-<meta name="variant" content="?6001-last">
+<meta name="variant" content="?6001-7000">
+<meta name="variant" content="?7001-last">
 <link rel=stylesheet href=../include/reset.css>
 <title>insertparagraph - HTML editing conformance tests</title>
 
diff --git a/tests/wpt/tests/encoding/sharedarraybuffer.https.html b/tests/wpt/tests/encoding/sharedarraybuffer.https.html
index 2496edacb89..2cda3e5fb1c 100644
--- a/tests/wpt/tests/encoding/sharedarraybuffer.https.html
+++ b/tests/wpt/tests/encoding/sharedarraybuffer.https.html
@@ -6,9 +6,7 @@
 test(() => {
   const decoder = new TextDecoder('utf-8');
   const buffer = new SharedArrayBuffer(4);
-  assert_throws_js(TypeError, () => {
-    decoder.decode(new Uint8Array(buffer));
-  }, 'constructing TextDecoder with SharedArrayBuffer view should throw');
+  assert_equals(decoder.decode(new Uint8Array(buffer)), "\u0000\u0000\u0000\u0000");
 }, 'decoding SharedArrayBuffer');
 
 </script>
diff --git a/tests/wpt/tests/event-timing/buffered-and-duration-threshold.html b/tests/wpt/tests/event-timing/buffered-and-duration-threshold.html
index 4a7a63f59af..5f8d27c0345 100644
--- a/tests/wpt/tests/event-timing/buffered-and-duration-threshold.html
+++ b/tests/wpt/tests/event-timing/buffered-and-duration-threshold.html
@@ -19,7 +19,7 @@ promise_test(async t => {
       new PerformanceObserver(() => {
         resolve2();
       }).observe({type: "event", durationThreshold: 16});
-      await clickOnElementAndDelay('myDiv', 30);
+      await clickAndBlockMain('myDiv', { duration: 30 });
     });
     const afterFirstClick = performance.now();
     new PerformanceObserver(t.step_func(list => {
@@ -37,7 +37,7 @@ promise_test(async t => {
       });
     })).observe({type: 'event', durationThreshold: 16, buffered: true});
     // This should be the only click observed since the other one would not be buffered.
-    await clickOnElementAndDelay('myDiv', 30);
+    await clickAndBlockMain('myDiv', { duration: 30 } );
   });
 }, "PerformanceObserver buffering independent of durationThreshold");
 </script>
diff --git a/tests/wpt/tests/event-timing/click-timing.html b/tests/wpt/tests/event-timing/click-timing.html
index 24bad0aedca..f2b6922f5e5 100644
--- a/tests/wpt/tests/event-timing/click-timing.html
+++ b/tests/wpt/tests/event-timing/click-timing.html
@@ -19,44 +19,53 @@
   let timeBeforeFirstClick;
   let timeAfterFirstClick;
   let timeAfterSecondClick;
-  let observedEntries = [];
-  async_test(function(t) {
-    assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
-    new PerformanceObserver(t.step_func(entryList => {
-      observedEntries = observedEntries.concat(entryList.getEntries().filter(
-        entry => entry.name === 'pointerdown'));
-      if (observedEntries.length < 2)
-        return;
 
-      assert_not_equals(timeBeforeFirstClick, undefined);
-      assert_not_equals(timeAfterFirstClick, undefined);
-      assert_not_equals(timeAfterSecondClick, undefined);
-      // First click.
-      verifyClickEvent(observedEntries[0], 'button');
-      assert_between_exclusive(observedEntries[0].processingStart,
-          timeBeforeFirstClick,
-          timeAfterFirstClick,
-          "First click's processingStart");
-      assert_greater_than(timeAfterFirstClick, observedEntries[0].startTime,
-          "timeAfterFirstClick should be later than first click's start time.");
+  function testExpectations(observedEntries) {
+    assert_not_equals(timeBeforeFirstClick, undefined);
+    assert_not_equals(timeAfterFirstClick, undefined);
+    assert_not_equals(timeAfterSecondClick, undefined);
 
-      // Second click.
-      verifyClickEvent(observedEntries[1], 'button');
-      assert_between_exclusive(observedEntries[1].processingStart,
-          timeAfterFirstClick,
-          timeAfterSecondClick,
-          "Second click's processingStart");
-      assert_greater_than(timeAfterSecondClick, observedEntries[1].startTime,
+    // First click.
+    verifyClickEvent(observedEntries[0], 'button');
+    assert_between_exclusive(observedEntries[0].processingStart,
+        timeBeforeFirstClick,
+        timeAfterFirstClick,
+        "First click's processingStart");
+    assert_greater_than(timeAfterFirstClick, observedEntries[0].startTime,
+        "timeAfterFirstClick should be later than first click's start time.");
+
+    // Second click.
+    verifyClickEvent(observedEntries[1], 'button');
+    assert_between_exclusive(observedEntries[1].processingStart,
+        timeAfterFirstClick,
+        timeAfterSecondClick,
+        "Second click's processingStart");
+    assert_greater_than(timeAfterSecondClick, observedEntries[1].startTime,
           "timeAfterSecondClick should be later than second click's start time.");
-      t.done();
-    })).observe({type: 'event'});
+  }
+
+  promise_test(async function(t) {
+    assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
+
+    const observerPromise = new Promise(resolve => {
+      const observedEntries = [];
+      new PerformanceObserver(entryList => {
+        observedEntries.push(...entryList.getEntriesByName("pointerdown"));
+        if (observedEntries.length < 2)
+          return;
+        resolve(observedEntries);
+      }).observe({type: 'event'});
+    })
+
     timeBeforeFirstClick = performance.now();
-    clickAndBlockMain('button').then( () => {
-      timeAfterFirstClick = performance.now();
-      clickAndBlockMain('button').then(() => {
-        timeAfterSecondClick = performance.now();
-      })
-    });
+    await clickAndBlockMain('button');
+    timeAfterFirstClick = performance.now();
+    await clickAndBlockMain('button');
+    timeAfterSecondClick = performance.now();
+
+    const observedEntries = await observerPromise;
+    testExpectations(observedEntries);
+
   }, "Event Timing: compare click timings.");
 </script>
 </html>
diff --git a/tests/wpt/tests/event-timing/crossiframe.html b/tests/wpt/tests/event-timing/crossiframe.html
index df4d94f09ae..c307028c413 100644
--- a/tests/wpt/tests/event-timing/crossiframe.html
+++ b/tests/wpt/tests/event-timing/crossiframe.html
@@ -46,11 +46,14 @@
 
   promise_test(async t => {
     assert_implements(window.PerformanceEventTiming, "Event Timing is not supported");
+
     // Wait for load event so we can interact with the iframe.
     await new Promise(resolve => {
       window.addEventListener('load', resolve);
     });
+
     clickTimeMin = performance.now();
+
     let observedPointerDown = false;
     const observerPromise = new Promise(resolve => {
       new PerformanceObserver(t.step_func(entries => {
@@ -61,14 +64,16 @@
 
         assert_false(observedPointerDown,
             "Observer of main frames should only capture main-frame event-timing entries");
-        validateEntries(pointerDowns);
         observedPointerDown = true;
-        resolve();
+        resolve(pointerDowns);
       })).observe({type: 'event'});
     });
-    clickAndBlockMain('button').then(() => {
-      clickDone = performance.now();
-    });
+
+    await clickAndBlockMain('button');
+    clickDone = performance.now();
+    const pointerDowns = await observerPromise;
+    validateEntries(pointerDowns);
+
     const childFrameEntriesPromise = new Promise(resolve => {
       window.addEventListener("message", (event) => {
         // testdriver-complete is a webdriver internal event
@@ -80,13 +85,15 @@
         }
       }, false);
     });
+
     // Tap on the iframe, with an offset of 10 to target the div inside it.
     const actions = new test_driver.Actions()
         .pointerMove(10, 10, { origin: document.getElementById("iframe") })
         .pointerDown()
         .pointerUp();
     actions.send();
-    return Promise.all([observerPromise, childFrameEntriesPromise]);
+
+    await childFrameEntriesPromise;
   }, "Event Timing: entries should only be observable by its own frame.");
 
 </script>
diff --git a/tests/wpt/tests/event-timing/first-input-interactionid-tap.html b/tests/wpt/tests/event-timing/first-input-interactionid-tap.html
index f5e080eb165..17d9a5e9812 100644
--- a/tests/wpt/tests/event-timing/first-input-interactionid-tap.html
+++ b/tests/wpt/tests/event-timing/first-input-interactionid-tap.html
@@ -45,6 +45,8 @@
 
     assert_greater_than(firstInputInteractionId, 0, 'The first input entry should have a non-trivial interactionId');
     assert_equals(firstInputInteractionId, eventTimingPointerDownInteractionId, 'The first input entry should have the same interactionId as the event timing pointerdown entry');
+    assert_equals(firstInputInteractionId.target, eventTimingPointerDownInteractionId.target, 'The first input entry should have the same target as the event timing pointerdown entry');
+    assert_not_equals(firstInputInteractionId.target, null, 'The first input entry should have a non-null target');
 
   }, "The interactionId of the first input entry should match the same pointerdown entry of event timing when tap.");
 </script>
diff --git a/tests/wpt/tests/event-timing/resources/event-timing-test-utils.js b/tests/wpt/tests/event-timing/resources/event-timing-test-utils.js
index 859bc0f7bf5..9670d8d26f8 100644
--- a/tests/wpt/tests/event-timing/resources/event-timing-test-utils.js
+++ b/tests/wpt/tests/event-timing/resources/event-timing-test-utils.js
@@ -1,24 +1,44 @@
-// Clicks on the element with the given ID. It adds an event handler to the element which
-// ensures that the events have a duration of at least |delay|. Calls |callback| during
-// event handler if |callback| is provided.
-async function clickOnElementAndDelay(id, delay, callback) {
-  const element = document.getElementById(id);
-  const pointerdownHandler = () => {
-    mainThreadBusy(delay);
-    if (callback) {
-      callback();
-    }
-    element.removeEventListener("pointerdown", pointerdownHandler);
+function mainThreadBusy(ms) {
+  const target = performance.now() + ms;
+  while (performance.now() < target);
+}
+
+async function wait() {
+  return new Promise(resolve => step_timeout(resolve, 0));
+}
+
+async function raf() {
+  return new Promise(resolve => requestAnimationFrame(resolve));
+}
+
+async function afterNextPaint() {
+  await raf();
+  await wait();
+}
+
+async function blockNextEventListener(target, eventType, duration = 120) {
+  return new Promise(resolve => {
+    target.addEventListener(eventType, () => {
+      mainThreadBusy(duration);
+      resolve();
+    }, { once: true });
+  });
+}
+
+async function clickAndBlockMain(id, options = {}) {
+  options = {
+    eventType: "pointerdown",
+    duration: 120,
+    ...options
   };
+  const element = document.getElementById(id);
 
-  element.addEventListener("pointerdown", pointerdownHandler);
-  await click(element);
+  await Promise.all([
+    blockNextEventListener(element, options.eventType, options.duration),
+    click(element),
+  ]);
 }
 
-function mainThreadBusy(duration) {
-  const now = performance.now();
-  while (performance.now() < now + duration);
-}
 
 // This method should receive an entry of type 'event'. |isFirst| is true only when we want
 // to check that the event also happens to correspond to the first event. In this case, the
@@ -58,27 +78,7 @@ function verifyClickEvent(entry, targetId, isFirst=false, minDuration=104, event
   verifyEvent(entry, event, targetId, isFirst, minDuration);
 }
 
-function wait() {
-  return new Promise((resolve, reject) => {
-    step_timeout(() => {
-      resolve();
-    }, 0);
-  });
-}
 
-function clickAndBlockMain(id) {
-  return new Promise((resolve, reject) => {
-    clickOnElementAndDelay(id, 120, resolve);
-  });
-}
-
-function waitForTick() {
-  return new Promise(resolve => {
-    window.requestAnimationFrame(() => {
-      window.requestAnimationFrame(resolve);
-    });
-  });
-}
   // Add a PerformanceObserver and observe with a durationThreshold of |dur|. This test will
   // attempt to check that the duration is appropriately checked by:
   // * Asserting that entries received have a duration which is the smallest multiple of 8
@@ -115,7 +115,7 @@ async function testDuration(t, id, numEntries, dur, slowDur) {
   const clicksPromise = new Promise(async resolve => {
     for (let index = 0; index < numEntries; index++) {
       // Add some click events that has at least slowDur for duration.
-      await clickOnElementAndDelay(id, slowDur);
+      await clickAndBlockMain(id, { duration: slowDur });
     }
     resolve();
   });
@@ -154,11 +154,11 @@ async function testDuration(t, id, numEntries, dur, slowDur) {
       // These clicks are expected to be ignored, unless the test has some extra delays.
       // In that case, the test will verify the event duration to ensure the event duration is
       // greater than the duration threshold
-      await clickOnElementAndDelay(id, processingDelay);
+      await clickAndBlockMain(id, { duration: processingDelay });
     }
     // Send click with event duration equals to or greater than |durThreshold|, so the
     // observer promise can be resolved
-    await clickOnElementAndDelay(id, durThreshold);
+    await clickAndBlockMain(id, { duration: durThreshold });
     return observerPromise;
   }
 
@@ -269,7 +269,7 @@ async function testEventType(t, eventType, looseCount=false) {
   // Trigger two 'fast' events of the type.
   await applyAction(eventType, target);
   await applyAction(eventType, target);
-  await waitForTick();
+  await afterNextPaint();
   await new Promise(t.step_func(resolve => {
     testCounts(t, resolve, looseCount, eventType, initialCount + 2);
   }));
@@ -313,7 +313,7 @@ async function testEventType(t, eventType, looseCount=false) {
   // Cause a slow event.
   await applyAction(eventType, target);
 
-  await waitForTick();
+  await afterNextPaint();
 
   await observerPromise;
 }
diff --git a/tests/wpt/tests/event-timing/shadow-dom-null-target.html b/tests/wpt/tests/event-timing/shadow-dom-null-target.html
index 89587312c89..0872e4e8faf 100644
--- a/tests/wpt/tests/event-timing/shadow-dom-null-target.html
+++ b/tests/wpt/tests/event-timing/shadow-dom-null-target.html
@@ -42,7 +42,7 @@ promise_test(async t => {
     Math.ceil(span1Rect.y + span1Rect.height / 2)
   ).send();
 
-  await waitForTick();
+  await afterNextPaint();
 
   const observerPromise = new Promise(resolve => {
     new PerformanceObserver(t.step_func(entryList => {
@@ -60,7 +60,7 @@ promise_test(async t => {
     Math.ceil(span2Rect.y + span2Rect.height / 2)
   ).send();
 
-  await waitForTick();
+  await afterNextPaint();
 
   await observerPromise;
 }, "Event Timing: Move pointer within shadow DOM should create event-timing entry with null target.");
diff --git a/tests/wpt/tests/fenced-frame/deprecated-config-apis.https.html b/tests/wpt/tests/fenced-frame/deprecated-config-apis.https.html
index 11cd247f23d..e746336f472 100644
--- a/tests/wpt/tests/fenced-frame/deprecated-config-apis.https.html
+++ b/tests/wpt/tests/fenced-frame/deprecated-config-apis.https.html
@@ -21,7 +21,7 @@ promise_test(async () => {
   const config = new FencedFrameConfig(location.href);
   try {
     await navigator.deprecatedReplaceInURN(config, {});
-    assert_unreached('deprecatedReplaceInURN must throwfor default configs');
+    assert_unreached('deprecatedReplaceInURN must throw for default configs');
   } catch (e) {
     assert_equals(e.message,
                   "Failed to execute 'deprecatedReplaceInURN' on 'Navigator': "
diff --git a/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-in-iframe-navigation.https.html b/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-in-iframe-navigation.https.html
new file mode 100644
index 00000000000..3a44c3c2f46
--- /dev/null
+++ b/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-in-iframe-navigation.https.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<title>Test that window.fence.disableUntrustedNetwork disables
+  embedder-initiated navigation of FF -> IF -> FF.</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<script>
+
+// Run a test with a fenced frame nested in an iframe nested in a fenced frame.
+// If `should_disable_network` is true, window.fence.disableUntrustedNetwork
+// will be called before creating the nested fenced frame.
+// If `use_urn_iframe` is true, the nested iframe will be a urn iframe.
+async function ff_if_ff_test(t, should_disable_network, use_urn_iframe, should_succeed) {
+const fencedframe = await attachFencedFrameContext({generator_api: 'sharedstorage'});
+  const navigation_promise =
+      fencedframe.execute(async (should_disable_network, use_urn_iframe) => {
+        let args = {};
+        if (use_urn_iframe) {
+          args = {generator_api: 'sharedstorage'};
+        }
+        const nested_iframe = await attachIFrameContext(args);
+        await nested_iframe.execute(() => {});
+        if (should_disable_network) {
+          await window.fence.disableUntrustedNetwork();
+        }
+        return nested_iframe.execute(async () => {
+          const nested_fenced_frame = await attachFencedFrameContext({
+              generator_api: 'sharedstorage'});
+          return nested_fenced_frame.execute(() => { return 'nav success'; });
+        });
+      },
+      [should_disable_network, use_urn_iframe]);
+  if (should_succeed) {
+    const result = await navigation_promise;
+    assert_equals(result, 'nav success');
+  } else {
+    const result = await Promise.race([navigation_promise,
+      new Promise((resolve, reject) => t.step_timeout(
+       () => resolve('timeout'), 1000))
+    ]);
+    assert_equals(result, 'timeout');
+  }
+}
+
+promise_test(async(t) => {
+  await ff_if_ff_test(t, /*should_disable_network=*/false,
+                         /*use_urn_iframe=*/false,
+                         /*should_succeed=*/true);
+}, 'FF->IF->FF navigation works');
+
+promise_test(async(t) => {
+  await ff_if_ff_test(t, /*should_disable_network=*/false,
+                         /*use_urn_iframe=*/true,
+                         /*should_succeed=*/true);
+}, 'FF->UIF->FF navigation works');
+
+promise_test(async(t) => {
+  await ff_if_ff_test(t, /*should_disable_network=*/true,
+                         /*use_urn_iframe=*/false,
+                         /*should_succeed=*/false);
+}, 'window.fence.disableUntrustedNetwork disables FF->IF->FF navigation');
+
+promise_test(async(t) => {
+  await ff_if_ff_test(t, /*should_disable_network=*/true,
+                         /*use_urn_iframe=*/true,
+                         /*should_succeed=*/false);
+}, 'window.fence.disableUntrustedNetwork disables FF->UF->FF navigation');
+
+</script>
+</body>
diff --git a/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-navigation.https.html b/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-navigation.https.html
new file mode 100644
index 00000000000..b80350a5888
--- /dev/null
+++ b/tests/wpt/tests/fenced-frame/revoke-nested-fenced-frame-navigation.https.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<title>Test that window.fence.disableUntrustedNetwork disables
+  embedder-initiated navigation of nested fenced frames.</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<script>
+
+// Run a test with a fenced frame nested in a fenced frame.
+// If `should_disable_network` is true, window.fence.disableUntrustedNetwork
+// will be called before creating the nested fenced frame.
+async function ff_ff_test(t, should_disable_network, should_succeed) {
+  const fencedframe = await attachFencedFrameContext();
+  const navigation_promise =
+      fencedframe.execute(async (should_disable_network) => {
+        if (should_disable_network) {
+          await window.fence.disableUntrustedNetwork();
+        }
+        const nested_fenced_frame = await attachFencedFrameContext();
+        return nested_fenced_frame.execute(() => { return 'nav success'; }); },
+      [should_disable_network]);
+  if (should_succeed) {
+    const result = await navigation_promise;
+    assert_equals(result, 'nav success');
+  } else {
+    const result = await Promise.race([
+        navigation_promise,
+        new Promise((resolve, reject) => t.step_timeout(
+          () => resolve('timeout'), 2000))]);
+    assert_equals(result, 'timeout');
+  }
+}
+
+promise_test(async(t) => {
+  await ff_ff_test(t, /*should_disable_network=*/false,
+                      /*should_succeed=*/true);
+}, 'FF->FF navigation works');
+
+promise_test(async(t) => {
+  await ff_ff_test(t, /*should_disable_network=*/true,
+                      /*should_succeed=*/false);
+}, 'window.fence.disableUntrustedNetwork disables FF->FF navigation');
+
+</script>
+</body>
diff --git a/tests/wpt/tests/fetch/private-network-access/resources/preflight.py b/tests/wpt/tests/fetch/private-network-access/resources/preflight.py
index 7ab9dffe1d9..44676632394 100644
--- a/tests/wpt/tests/fetch/private-network-access/resources/preflight.py
+++ b/tests/wpt/tests/fetch/private-network-access/resources/preflight.py
@@ -78,9 +78,8 @@ def _get_response_headers(method, mode, origin):
     return [
         acam,
         ("Access-Control-Allow-Origin", origin),
-        _ACAPN,
         ("Access-Control-Allow-Credentials", "true"),
-        ("Access-Control-Allow-Headers", "Upgrade-Insecure-Requests")
+        _ACAPN,
     ]
 
   return []
diff --git a/tests/wpt/tests/generic-sensor/generic-sensor-tests.js b/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
index 3b23fe89191..292b562ff37 100644
--- a/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
+++ b/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
@@ -457,8 +457,7 @@ function runGenericSensorTests(sensorData, readingData) {
       sensor.stop();
       await test_driver.remove_virtual_sensor(testDriverName);
     });
-    const sensorWatcher =
-        new EventWatcher(t, sensor, ['activate', 'reading', 'error']);
+    const sensorWatcher = new EventWatcher(t, sensor, ['activate', 'error']);
 
     sensor.start();
     await sensorWatcher.wait_for('activate');
@@ -474,34 +473,40 @@ function runGenericSensorTests(sensorData, readingData) {
     assert_false(sensor.hasReading);
     assert_sensor_reading_is_null(sensor);
 
+    const hiddenEventPromise = new Promise(resolve => {
+      sensor.addEventListener('reading', t.step_func((event) => {
+        assert_false(document.hidden);
+        resolve(event);
+      }, {once: true}));
+    });
+
     const reading = readings.next().value;
     await test_driver.update_virtual_sensor(testDriverName, reading);
 
+    const visibilityChangeEventPromise =
+        new EventWatcher(t, document, 'visibilitychange')
+            .wait_for('visibilitychange');
+
+    const preRestoreTimestamp = performance.now();
     await restore();
+
+    const readingEvent = await hiddenEventPromise;
+
     assert_false(document.hidden);
     assert_true(sensor.activated);
-    assert_false(sensor.hasReading);
-    assert_sensor_reading_is_null(sensor);
-
-    const visiblePageTimestamp = performance.now();
-
-    const [readingEvent] = await Promise.all([
-      sensorWatcher.wait_for('reading'),
-      test_driver.update_virtual_sensor(testDriverName, reading),
-    ]);
-
-    const postReadingTimestamp = performance.now();
-
+    assert_true(sensor.hasReading);
     assert_sensor_reading_equals(sensor, expectedReadings.next().value);
 
-    // Check that the only reading we received all this time was the one sent
-    // after the page was made visible again. This is done by verifying the
-    // timestamps of the event as well as the current reading's.
-    assert_greater_than_equal(sensor.timestamp, visiblePageTimestamp);
-    assert_greater_than(readingEvent.timeStamp, sensor.timestamp);
-    assert_greater_than_equal(
-        postReadingTimestamp, readingEvent.timeStamp,
-        'No new reading events have been delivered');
+    // Check that a reading sent while the page is hidden is stashed and
+    // triggers an update only when it is visible again: the original timestamp
+    // remains, but the event is emitted only after the "visibilitychange"
+    // event is fired.
+    assert_less_than(
+        sensor.timestamp, preRestoreTimestamp,
+        'Original sensor timestamp is used even if the update is delayed');
+    assert_greater_than(
+        readingEvent.timeStamp, (await visibilityChangeEventPromise).timeStamp,
+        'Sensor "reading" event is always emitted after page visibility is restored');
   }, `${sensorName}: Readings are not delivered when the page has no visibility`);
 
   sensor_test(async t => {
diff --git a/tests/wpt/tests/html-aam/roles-contextual.html b/tests/wpt/tests/html-aam/roles-contextual.html
index 943c8e158b1..200fed7e753 100644
--- a/tests/wpt/tests/html-aam/roles-contextual.html
+++ b/tests/wpt/tests/html-aam/roles-contextual.html
@@ -22,12 +22,35 @@
 <a data-testname="el-a-no-href" class="ex-generic">x</a>
 
 <!-- el-aside -->
+<aside data-testname="el-aside" data-expectedrole="complementary" class="ex">x</aside>
+<main>
+  <aside data-testname="el-aside-in-main" data-expectedrole="complementary" class="ex">x</aside>
+  <article>
+    <aside data-testname="el-aside-in-article-in-main" class="ex-generic">x</aside>
+    <aside data-testname="el-aside-in-article-in-main-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
+  </article>
+</main>
+<article>
+  <aside data-testname="el-aside-in-article" class="ex-generic">x</aside>
+  <aside data-testname="el-aside-in-article-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
+</article>
+<aside>
+  <aside data-testname="el-aside-in-aside" class="ex-generic">x</aside>
+  <aside data-testname="el-aside-in-aside-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
+</aside>
 <nav>
-  <aside data-testname="el-aside-in-section-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
-  <aside data-testname="el-aside-in-section-without-name" class="ex-generic">x</aside>
-  <aside data-testname="el-aside-in-section-with-role" data-expectedrole="complementary" class="ex" role="complementary">x</aside>
+  <aside data-testname="el-aside-in-nav" class="ex-generic">x</aside>
+  <aside data-testname="el-aside-in-nav-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
+  <aside data-testname="el-aside-in-nav-with-role" data-expectedrole="complementary" class="ex" role="complementary">x</aside>
 </nav>
-<aside data-testname="el-aside-ancestorbodymain" data-expectedrole="complementary" class="ex">x</aside>
+<!-- Spec says that the conditional aside mapping happens when nested in a sectioning content element.
+  However, this doesn't make sense if the parent <section> isn't a landmark in the first place.
+  Let's force the section to always be a landmark for now, but we should probably expand on this test
+  case pending discussions in https://github.com/w3c/html-aam/pull/484 -->
+<section aria-label="x">
+  <aside data-testname="el-aside-in-section" class="ex-generic">x</aside>
+  <aside data-testname="el-aside-in-section-with-name" data-expectedrole="complementary" aria-label="x" class="ex">x</aside>
+</section>
 
 <!-- el-footer -->
 <nav>
@@ -55,4 +78,4 @@ AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
-</html>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html b/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html
similarity index 100%
rename from tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-bfcache-restore.html
rename to tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-bfcache-restore.html
diff --git a/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html b/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html
similarity index 100%
rename from tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-new-document-navigation.html
rename to tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html
diff --git a/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html b/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html
similarity index 100%
rename from tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/order-in-prerender-activation.html
rename to tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-prerender-activation.html
diff --git a/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/resources/order-in-prerender-activation-popup.html b/tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/resources/order-in-prerender-activation-popup.html
similarity index 100%
rename from tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/tentative/resources/order-in-prerender-activation-popup.html
rename to tests/wpt/tests/html/browsers/browsing-the-web/history-traversal/pagereveal/resources/order-in-prerender-activation-popup.html
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full-expected.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full-expected.html
new file mode 100644
index 00000000000..5a47f8e1188
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.clearRect.full</title>
+<h1>2d.layer.clearRect.full</h1>
+<p class="desc">clearRect inside a layer can clear all of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full.html
new file mode 100644
index 00000000000..579c6e10533
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.full.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.clearRect.full-expected.html">
+<title>Canvas test: 2d.layer.clearRect.full</title>
+<h1>2d.layer.clearRect.full</h1>
+<p class="desc">clearRect inside a layer can clear all of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 50);
+  ctx.fillStyle = 'green';
+  ctx.clearRect(0, 0, 100, 100);
+  ctx.endLayer();
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial-expected.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial-expected.html
new file mode 100644
index 00000000000..ac75105cecb
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial-expected.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.clearRect.partial</title>
+<h1>2d.layer.clearRect.partial</h1>
+<p class="desc">clearRect inside a layer can clear a portion of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 10);
+  ctx.fillRect(20, 60, 80, 10);
+  ctx.fillRect(20, 20, 10, 50);
+  ctx.fillRect(90, 20, 10, 50);
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial.html
new file mode 100644
index 00000000000..8323ffb9316
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.clearRect.partial.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.clearRect.partial-expected.html">
+<title>Canvas test: 2d.layer.clearRect.partial</title>
+<h1>2d.layer.clearRect.partial</h1>
+<p class="desc">clearRect inside a layer can clear a portion of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 50);
+  ctx.clearRect(30, 30, 60, 30);
+  ctx.endLayer();
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.flush-on-frame-presentation-expected.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.flush-on-frame-presentation-expected.html
index 34c92ca27f2..532c29576cf 100644
--- a/tests/wpt/tests/html/canvas/element/layers/2d.layer.flush-on-frame-presentation-expected.html
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.flush-on-frame-presentation-expected.html
@@ -20,9 +20,7 @@
   ctx.fillRect(40, 40, 75, 50);
   ctx.fillStyle = 'grey';
   ctx.fillRect(50, 50, 75, 50);
-  ctx.endLayer();
 
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
   ctx.fillStyle = 'grey';
   ctx.fillRect(70, 70, 75, 50);
   ctx.fillStyle = 'orange';
diff --git a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers-expected.html b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers-expected.html
index 04a6d07fdab..873869ea726 100644
--- a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers-expected.html
+++ b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers-expected.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <title>Canvas test: unclosed-layers</title>
 <h1>unclosed-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -11,11 +11,4 @@
 
   ctx.fillStyle = 'purple';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-  ctx.endLayer();
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers.html b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers.html
index 4ae110d4a67..afb53cfbebc 100644
--- a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers.html
+++ b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-layers.html
@@ -2,7 +2,7 @@
 <link rel="match" href="unclosed-layers-expected.html">
 <title>Canvas test: unclosed-layers</title>
 <h1>unclosed-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -12,10 +12,9 @@
 
   ctx.fillStyle = 'purple';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
 
   ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
   ctx.fillRect(40, 40, 75, 50);
   ctx.fillStyle = 'grey';
   ctx.fillRect(50, 50, 75, 50);
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers-expected.html b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers-expected.html
index 9a848b46d71..8557441f7e2 100644
--- a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers-expected.html
+++ b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers-expected.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <title>Canvas test: unclosed-nested-layers</title>
 <h1>unclosed-nested-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -9,19 +9,6 @@
   const canvas = document.getElementById("canvas");
   const ctx = canvas.getContext('2d');
 
-  const canvas1 = document.createElement('canvas');
-  const ctx1 = canvas1.getContext('2d');
-  ctx1.fillStyle = 'rgba(0,255,0,1)';
-  ctx1.fillRect(70,70,75,50);
-
-  const canvas2 = document.createElement('canvas');
-  const ctx2 = canvas2.getContext('2d');
-  ctx2.fillStyle = 'rgba(225,0,0,1)';
-  ctx2.fillRect(50,50,75,50);
-  ctx2.drawImage(canvas1, 0, 0);
-
   ctx.fillStyle = 'rgba(0,0,255,1)';
   ctx.fillRect(60,60,75,50);
-  ctx.globalAlpha = 0.5;
-  ctx.drawImage(canvas2, 0, 0);
 </script>
diff --git a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers.html b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers.html
index beb1cf9aa1f..ada874a51aa 100644
--- a/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers.html
+++ b/tests/wpt/tests/html/canvas/element/manual/layers/unclosed-nested-layers.html
@@ -2,7 +2,7 @@
 <link rel="match" href="unclosed-nested-layers-expected.html">
 <title>Canvas test: unclosed-nested-layers</title>
 <h1>unclosed-nested-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -12,7 +12,6 @@
 
   ctx.fillStyle = 'rgba(0, 0, 255, 1)';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
 
   ctx.beginLayer();
   ctx.fillStyle = 'rgba(225, 0, 0, 1)';
@@ -24,4 +23,4 @@
 
   ctx.endLayer();
   // Missing ctx.endLayer() here.
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc-expected.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc-expected.html
deleted file mode 100644
index 7c0faba5859..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.arc</title>
-<h1>2d.path.stroke.prune.closePath.arc</h1>
-<p class="desc">Test if zero-lengthed closePath before and after arc are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.arc(20, 20, 15, 0, Math.PI);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc.html
deleted file mode 100644
index 4b1d0692758..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.arc.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.arc-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.arc</title>
-<h1>2d.path.stroke.prune.closePath.arc</h1>
-<p class="desc">Test if zero-lengthed closePath before and after arc are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(50, 25);
-  ctx.lineTo(50, 25);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.arc(20, 20, 15, 0, Math.PI);
-  ctx.closePath();
-
-  ctx.moveTo(40, 40);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html
deleted file mode 100644
index 4b867f821fa..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.bezierCurve</title>
-<h1>2d.path.stroke.prune.closePath.bezierCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after bezier curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html
deleted file mode 100644
index 2c974bd2740..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.bezierCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.bezierCurve</title>
-<h1>2d.path.stroke.prune.closePath.bezierCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after bezier curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(5, 5);
-  ctx.lineTo(5, 5);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-  ctx.closePath();
-
-  ctx.moveTo(20, 40);
-  ctx.lineTo(20, 40);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line-expected.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line-expected.html
deleted file mode 100644
index 87a99c79380..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.line</title>
-<h1>2d.path.stroke.prune.closePath.line</h1>
-<p class="desc">Test if zero-lengthed closePath before and after line are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line.html
deleted file mode 100644
index 655b2e12fda..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.line.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.line-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.line</title>
-<h1>2d.path.stroke.prune.closePath.line</h1>
-<p class="desc">Test if zero-lengthed closePath before and after line are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(50, 25);
-  ctx.lineTo(50, 25);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-
-  ctx.moveTo(45, 45);
-  ctx.lineTo(45, 45);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html
deleted file mode 100644
index 03635b01483..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.quadraticCurve</title>
-<h1>2d.path.stroke.prune.closePath.quadraticCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.quadraticCurveTo(80, 10, 100, 50);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html b/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html
deleted file mode 100644
index 9066770e221..00000000000
--- a/tests/wpt/tests/html/canvas/element/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html
+++ /dev/null
@@ -1,35 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.quadraticCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.quadraticCurve</title>
-<h1>2d.path.stroke.prune.closePath.quadraticCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(5, 5);
-  ctx.lineTo(5, 5);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.quadraticCurveTo(80, 10, 100, 50);
-  ctx.closePath();
-
-  ctx.moveTo(40, 40);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full-expected.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full-expected.html
new file mode 100644
index 00000000000..5a47f8e1188
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full-expected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.clearRect.full</title>
+<h1>2d.layer.clearRect.full</h1>
+<p class="desc">clearRect inside a layer can clear all of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.html
new file mode 100644
index 00000000000..ec9f453b69e
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.clearRect.full-expected.html">
+<title>Canvas test: 2d.layer.clearRect.full</title>
+<h1>2d.layer.clearRect.full</h1>
+<p class="desc">clearRect inside a layer can clear all of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 50);
+  ctx.fillStyle = 'green';
+  ctx.clearRect(0, 0, 100, 100);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html
similarity index 51%
rename from tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html
rename to tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html
index 860ad7036c9..a6f4021dd50 100644
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.full.w.html
@@ -1,39 +1,27 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
-<link rel="match" href="2d.path.stroke.prune.closePath.line-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.line</title>
-<h1>2d.path.stroke.prune.closePath.line</h1>
-<p class="desc">Test if zero-lengthed closePath before and after line are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
+<link rel="match" href="2d.layer.clearRect.full-expected.html">
+<title>Canvas test: 2d.layer.clearRect.full</title>
+<h1>2d.layer.clearRect.full</h1>
+<p class="desc">clearRect inside a layer can clear all of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
 <script id='myWorker' type='text/worker'>
   self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 50);
+    const canvas = new OffscreenCanvas(100, 100);
     const ctx = canvas.getContext('2d');
 
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
 
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(50, 25);
-    ctx.lineTo(50, 25);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-
-    ctx.moveTo(45, 45);
-    ctx.lineTo(45, 45);
-    ctx.closePath();
-    ctx.stroke();
+    ctx.beginLayer();
+    ctx.fillStyle = 'red';
+    ctx.fillRect(20, 20, 80, 50);
+    ctx.fillStyle = 'green';
+    ctx.clearRect(0, 0, 100, 100);
+    ctx.endLayer();
 
     const bitmap = canvas.transferToImageBitmap();
     self.postMessage(bitmap, bitmap);
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial-expected.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial-expected.html
new file mode 100644
index 00000000000..ac75105cecb
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial-expected.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.clearRect.partial</title>
+<h1>2d.layer.clearRect.partial</h1>
+<p class="desc">clearRect inside a layer can clear a portion of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = document.getElementById("canvas");
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 10);
+  ctx.fillRect(20, 60, 80, 10);
+  ctx.fillRect(20, 20, 10, 50);
+  ctx.fillRect(90, 20, 10, 50);
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html
new file mode 100644
index 00000000000..88509a8a40b
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<link rel="match" href="2d.layer.clearRect.partial-expected.html">
+<title>Canvas test: 2d.layer.clearRect.partial</title>
+<h1>2d.layer.clearRect.partial</h1>
+<p class="desc">clearRect inside a layer can clear a portion of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
+  <p class="fallback">FAIL (fallback content)</p>
+</canvas>
+<script>
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = 'blue';
+  ctx.fillRect(10, 10, 80, 50);
+
+  ctx.beginLayer();
+  ctx.fillStyle = 'red';
+  ctx.fillRect(20, 20, 80, 50);
+  ctx.clearRect(30, 30, 60, 30);
+  ctx.endLayer();
+
+  const outputCanvas = document.getElementById("canvas");
+  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html
similarity index 50%
rename from tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html
rename to tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html
index f10836239f4..c6ba41afd76 100644
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.clearRect.partial.w.html
@@ -1,39 +1,26 @@
 <!DOCTYPE html>
 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
 <html class="reftest-wait">
-<link rel="match" href="2d.path.stroke.prune.closePath.arc-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.arc</title>
-<h1>2d.path.stroke.prune.closePath.arc</h1>
-<p class="desc">Test if zero-lengthed closePath before and after arc are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
+<link rel="match" href="2d.layer.clearRect.partial-expected.html">
+<title>Canvas test: 2d.layer.clearRect.partial</title>
+<h1>2d.layer.clearRect.partial</h1>
+<p class="desc">clearRect inside a layer can clear a portion of the layer content.</p>
+<canvas id="canvas" width="100" height="100">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
 <script id='myWorker' type='text/worker'>
   self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 50);
+    const canvas = new OffscreenCanvas(100, 100);
     const ctx = canvas.getContext('2d');
 
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
 
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(50, 25);
-    ctx.lineTo(50, 25);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.arc(20, 20, 15, 0, Math.PI);
-    ctx.closePath();
-
-    ctx.moveTo(40, 40);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-    ctx.stroke();
+    ctx.beginLayer();
+    ctx.fillStyle = 'red';
+    ctx.fillRect(20, 20, 80, 50);
+    ctx.clearRect(30, 30, 60, 30);
+    ctx.endLayer();
 
     const bitmap = canvas.transferToImageBitmap();
     self.postMessage(bitmap, bitmap);
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers-expected.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers-expected.html
index f6b05fc3f2b..873869ea726 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers-expected.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers-expected.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <title>Canvas test: unclosed-layers</title>
 <h1>unclosed-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -11,12 +11,4 @@
 
   ctx.fillStyle = 'purple';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-  ctx.endLayer();
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.html
index 6046f0f5780..4fee600d6cb 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.html
@@ -3,7 +3,7 @@
 <link rel="match" href="unclosed-layers-expected.html">
 <title>Canvas test: unclosed-layers</title>
 <h1>unclosed-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed layers aren't rendered.</p>
 <canvas id="canvas" width="1" height="1">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -15,7 +15,6 @@
 
   ctx.fillStyle = 'purple';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
 
   ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
   ctx.fillRect(40, 40, 75, 50);
@@ -31,4 +30,4 @@
     }
   }
   requestAnimationFrame(draw);
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.w.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.w.html
index 4616843a11a..a0014bb5976 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-layers.w.html
@@ -3,7 +3,7 @@
 <link rel="match" href="unclosed-layers-expected.html">
 <title>Canvas test: unclosed-layers</title>
 <h1>unclosed-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed layers aren't rendered.</p>
 <canvas id="canvas" width="1" height="1">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -15,7 +15,6 @@
 
     ctx.fillStyle = 'purple';
     ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
 
     ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
     ctx.fillRect(40, 40, 75, 50);
@@ -46,4 +45,4 @@
   worker.postMessage({
       canvas: offscreen
   }, [offscreen]);
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers-expected.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers-expected.html
index 9a848b46d71..8557441f7e2 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers-expected.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers-expected.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <title>Canvas test: unclosed-nested-layers</title>
 <h1>unclosed-nested-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
 <canvas id="canvas" width="200" height="200">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -9,19 +9,6 @@
   const canvas = document.getElementById("canvas");
   const ctx = canvas.getContext('2d');
 
-  const canvas1 = document.createElement('canvas');
-  const ctx1 = canvas1.getContext('2d');
-  ctx1.fillStyle = 'rgba(0,255,0,1)';
-  ctx1.fillRect(70,70,75,50);
-
-  const canvas2 = document.createElement('canvas');
-  const ctx2 = canvas2.getContext('2d');
-  ctx2.fillStyle = 'rgba(225,0,0,1)';
-  ctx2.fillRect(50,50,75,50);
-  ctx2.drawImage(canvas1, 0, 0);
-
   ctx.fillStyle = 'rgba(0,0,255,1)';
   ctx.fillRect(60,60,75,50);
-  ctx.globalAlpha = 0.5;
-  ctx.drawImage(canvas2, 0, 0);
 </script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html
index eb9936c3620..c6925beb745 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.html
@@ -3,7 +3,7 @@
 <link rel="match" href="unclosed-nested-layers-expected.html">
 <title>Canvas test: unclosed-nested-layers</title>
 <h1>unclosed-nested-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
 <canvas id="canvas" width="1" height="1">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -15,7 +15,6 @@
 
   ctx.fillStyle = 'rgba(0, 0, 255, 1)';
   ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
 
   ctx.beginLayer();
   ctx.fillStyle = 'rgba(225, 0, 0, 1)';
@@ -37,4 +36,4 @@
     }
   }
   requestAnimationFrame(draw);
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.w.html b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.w.html
index 8c6a69d87cc..1a1dc540526 100644
--- a/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/manual/layers/unclosed-nested-layers.w.html
@@ -3,7 +3,7 @@
 <link rel="match" href="unclosed-nested-layers-expected.html">
 <title>Canvas test: unclosed-nested-layers</title>
 <h1>unclosed-nested-layers</h1>
-<p class="desc">Check that layers are rendered even if not closed.</p>
+<p class="desc">Check that unclosed nested layers aren't rendered.</p>
 <canvas id="canvas" width="1" height="1">
   <p class="fallback">FAIL (fallback content)</p>
 </canvas>
@@ -15,7 +15,6 @@
 
     ctx.fillStyle = 'rgba(0, 0, 255, 1)';
     ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
 
     ctx.beginLayer();
     ctx.fillStyle = 'rgba(225, 0, 0, 1)';
@@ -52,4 +51,4 @@
   worker.postMessage({
       canvas: offscreen
   }, [offscreen]);
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc-expected.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc-expected.html
deleted file mode 100644
index 7c0faba5859..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.arc</title>
-<h1>2d.path.stroke.prune.closePath.arc</h1>
-<p class="desc">Test if zero-lengthed closePath before and after arc are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.arc(20, 20, 15, 0, Math.PI);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html
deleted file mode 100644
index aeff5bfd400..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.arc.html
+++ /dev/null
@@ -1,38 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.arc-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.arc</title>
-<h1>2d.path.stroke.prune.closePath.arc</h1>
-<p class="desc">Test if zero-lengthed closePath before and after arc are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 50);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(50, 25);
-  ctx.lineTo(50, 25);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.arc(20, 20, 15, 0, Math.PI);
-  ctx.closePath();
-
-  ctx.moveTo(40, 40);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html
deleted file mode 100644
index 4b867f821fa..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.bezierCurve</title>
-<h1>2d.path.stroke.prune.closePath.bezierCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after bezier curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html
deleted file mode 100644
index 09d3152a5e7..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.html
+++ /dev/null
@@ -1,38 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.bezierCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.bezierCurve</title>
-<h1>2d.path.stroke.prune.closePath.bezierCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after bezier curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 50);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(5, 5);
-  ctx.lineTo(5, 5);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-  ctx.closePath();
-
-  ctx.moveTo(20, 40);
-  ctx.lineTo(20, 40);
-  ctx.closePath();
-  ctx.stroke();
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html
deleted file mode 100644
index 66f15eb3f16..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.bezierCurve.w.html
+++ /dev/null
@@ -1,52 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.path.stroke.prune.closePath.bezierCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.bezierCurve</title>
-<h1>2d.path.stroke.prune.closePath.bezierCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after bezier curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 50);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(5, 5);
-    ctx.lineTo(5, 5);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-    ctx.closePath();
-
-    ctx.moveTo(20, 40);
-    ctx.lineTo(20, 40);
-    ctx.closePath();
-    ctx.stroke();
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line-expected.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line-expected.html
deleted file mode 100644
index 87a99c79380..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.line</title>
-<h1>2d.path.stroke.prune.closePath.line</h1>
-<p class="desc">Test if zero-lengthed closePath before and after line are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html
deleted file mode 100644
index 5a020cce171..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.line.html
+++ /dev/null
@@ -1,38 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.line-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.line</title>
-<h1>2d.path.stroke.prune.closePath.line</h1>
-<p class="desc">Test if zero-lengthed closePath before and after line are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 50);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(50, 25);
-  ctx.lineTo(50, 25);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-
-  ctx.moveTo(45, 45);
-  ctx.lineTo(45, 45);
-  ctx.closePath();
-  ctx.stroke();
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html
deleted file mode 100644
index 03635b01483..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve-expected.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.path.stroke.prune.closePath.quadraticCurve</title>
-<h1>2d.path.stroke.prune.closePath.quadraticCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.moveTo(10, 10);
-  ctx.quadraticCurveTo(80, 10, 100, 50);
-  ctx.closePath();
-  ctx.stroke();
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html
deleted file mode 100644
index 1d516710f20..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.html
+++ /dev/null
@@ -1,38 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.path.stroke.prune.closePath.quadraticCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.quadraticCurve</title>
-<h1>2d.path.stroke.prune.closePath.quadraticCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(100, 50);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#0f0';
-  ctx.fillRect(0, 0, 100, 50);
-
-  ctx.strokeStyle = '#f00';
-  ctx.lineWidth = 10;
-  ctx.lineCap = 'round';
-  ctx.lineJoin = 'round';
-
-  ctx.beginPath();
-  ctx.moveTo(5, 5);
-  ctx.lineTo(5, 5);
-  ctx.closePath();
-
-  ctx.moveTo(10, 10);
-  ctx.quadraticCurveTo(80, 10, 100, 50);
-  ctx.closePath();
-
-  ctx.moveTo(40, 40);
-  ctx.lineTo(40, 40);
-  ctx.closePath();
-  ctx.stroke();
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html b/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html
deleted file mode 100644
index 5bbd2732637..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/path-objects/2d.path.stroke.prune.closePath.quadraticCurve.w.html
+++ /dev/null
@@ -1,52 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.path.stroke.prune.closePath.quadraticCurve-expected.html">
-<title>Canvas test: 2d.path.stroke.prune.closePath.quadraticCurve</title>
-<h1>2d.path.stroke.prune.closePath.quadraticCurve</h1>
-<p class="desc">Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.</p>
-<canvas id="canvas" width="100" height="50">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(100, 50);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(5, 5);
-    ctx.lineTo(5, 5);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.quadraticCurveTo(80, 10, 100, 50);
-    ctx.closePath();
-
-    ctx.moveTo(40, 40);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-    ctx.stroke();
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml b/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
index 34f16ce5151..a44cb2ea2c1 100644
--- a/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
+++ b/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
@@ -436,9 +436,7 @@
     ctx.fillRect(40, 40, 75, 50);
     ctx.fillStyle = 'grey';
     ctx.fillRect(50, 50, 75, 50);
-    ctx.endLayer();
 
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
     ctx.fillStyle = 'grey';
     ctx.fillRect(70, 70, 75, 50);
     ctx.fillStyle = 'orange';
@@ -590,6 +588,45 @@
   reference:
     ctx.fillRect(10, 10, 75, 50);
 
+- name: 2d.layer.clearRect.partial
+  desc: clearRect inside a layer can clear a portion of the layer content.
+  size: [100, 100]
+  code: |
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
+
+    ctx.beginLayer();
+    ctx.fillStyle = 'red';
+    ctx.fillRect(20, 20, 80, 50);
+    ctx.clearRect(30, 30, 60, 30);
+    ctx.endLayer();
+  reference: |
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
+
+    ctx.fillStyle = 'red';
+    ctx.fillRect(20, 20, 80, 10);
+    ctx.fillRect(20, 60, 80, 10);
+    ctx.fillRect(20, 20, 10, 50);
+    ctx.fillRect(90, 20, 10, 50);
+
+- name: 2d.layer.clearRect.full
+  desc: clearRect inside a layer can clear all of the layer content.
+  size: [100, 100]
+  code: |
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
+
+    ctx.beginLayer();
+    ctx.fillStyle = 'red';
+    ctx.fillRect(20, 20, 80, 50);
+    ctx.fillStyle = 'green';
+    ctx.clearRect(0, 0, {{ size[0] }}, {{ size[1] }});
+    ctx.endLayer();
+  reference: |
+    ctx.fillStyle = 'blue';
+    ctx.fillRect(10, 10, 80, 50);
+
 - name: 2d.layer.valid-calls
   desc: No exception raised on {{ variant_desc }}.
   variants:
diff --git a/tests/wpt/tests/html/canvas/tools/yaml-new/path-objects.yaml b/tests/wpt/tests/html/canvas/tools/yaml-new/path-objects.yaml
index 755d6fb8d54..b1754b9495d 100644
--- a/tests/wpt/tests/html/canvas/tools/yaml-new/path-objects.yaml
+++ b/tests/wpt/tests/html/canvas/tools/yaml-new/path-objects.yaml
@@ -2879,158 +2879,6 @@
     @assert pixel 50,25 == 0,255,0,255;
   expected: green
 
-- name: 2d.path.stroke.prune.closePath.line
-  desc: Test if zero-lengthed closePath before and after line are ignored corrected.
-  code: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(50, 25);
-    ctx.lineTo(50, 25);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-
-    ctx.moveTo(45, 45);
-    ctx.lineTo(45, 45);
-    ctx.closePath();
-    ctx.stroke();
-  reference: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.moveTo(10, 10);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-    ctx.stroke();
-
-- name: 2d.path.stroke.prune.closePath.bezierCurve
-  desc: Test if zero-lengthed closePath before and after bezier curve are ignored corrected.
-  code: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(5, 5);
-    ctx.lineTo(5, 5);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-    ctx.closePath();
-
-    ctx.moveTo(20, 40);
-    ctx.lineTo(20, 40);
-    ctx.closePath();
-    ctx.stroke();
-  reference: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.moveTo(10, 10);
-    ctx.bezierCurveTo(10, 30, 40, 50, 100, 50);
-    ctx.closePath();
-    ctx.stroke();
-
-- name: 2d.path.stroke.prune.closePath.quadraticCurve
-  desc: Test if zero-lengthed closePath before and after quadratic curve are ignored corrected.
-  code: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(5, 5);
-    ctx.lineTo(5, 5);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.quadraticCurveTo(80, 10, 100, 50);
-    ctx.closePath();
-
-    ctx.moveTo(40, 40);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-    ctx.stroke();
-  reference: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.moveTo(10, 10);
-    ctx.quadraticCurveTo(80, 10, 100, 50);
-    ctx.closePath();
-    ctx.stroke();
-
-- name: 2d.path.stroke.prune.closePath.arc
-  desc: Test if zero-lengthed closePath before and after arc are ignored corrected.
-  code: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.beginPath();
-    ctx.moveTo(50, 25);
-    ctx.lineTo(50, 25);
-    ctx.closePath();
-
-    ctx.moveTo(10, 10);
-    ctx.arc(20, 20, 15, 0, Math.PI);
-    ctx.closePath();
-
-    ctx.moveTo(40, 40);
-    ctx.lineTo(40, 40);
-    ctx.closePath();
-    ctx.stroke();
-  reference: |
-    ctx.fillStyle = '#0f0';
-    ctx.fillRect(0, 0, 100, 50);
-
-    ctx.strokeStyle = '#f00';
-    ctx.lineWidth = 10;
-    ctx.lineCap = 'round';
-    ctx.lineJoin = 'round';
-
-    ctx.moveTo(10, 10);
-    ctx.arc(20, 20, 15, 0, Math.PI);
-    ctx.closePath();
-    ctx.stroke();
-
 - name: 2d.path.transformation.basic
   code: |
     ctx.fillStyle = '#f00';
diff --git a/tests/wpt/tests/html/dom/aria-element-reflection.html b/tests/wpt/tests/html/dom/aria-element-reflection.html
index 54b9d34eb17..bdf2450708b 100644
--- a/tests/wpt/tests/html/dom/aria-element-reflection.html
+++ b/tests/wpt/tests/html/dom/aria-element-reflection.html
@@ -772,6 +772,29 @@
       assert_equals(ariaFlowToElementsArray, cachingInvariantMain.ariaFlowToElements, "Caching invariant for ariaFlowToElements");
       assert_equals(ariaLabelledByElementsArray, cachingInvariantMain.ariaLabelledByElements, "Caching invariant for ariaLabelledByElements");
       assert_equals(ariaOwnsElementsArray, cachingInvariantMain.ariaOwnsElements, "Caching invariant for ariaOwnsElements");
+
+      // Ensure that stale values don't continue to be cached
+      cachingInvariantMain.ariaControlsElements = [cachingInvariantElement4, cachingInvariantElement5];
+      cachingInvariantMain.ariaDescribedByElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain.ariaDetailsElements = [cachingInvariantElement3];
+      cachingInvariantMain.ariaFlowToElements = [cachingInvariantElement4, cachingInvariantElement5];
+      cachingInvariantMain.ariaLabelledByElements = [cachingInvariantElement1, cachingInvariantElement2];
+      cachingInvariantMain.ariaOwnsElements = [cachingInvariantElement3, cachingInvariantElement4, cachingInvariantElement1];
+
+      ariaControlsElementsArray = cachingInvariantMain.ariaControlsElements;
+      ariaDescribedByElementsArray = cachingInvariantMain.ariaDescribedByElements;
+      ariaDetailsElementsArray = cachingInvariantMain.ariaDetailsElements;
+      ariaFlowToElementsArray = cachingInvariantMain.ariaFlowToElements;
+      ariaLabelledByElementsArray = cachingInvariantMain.ariaLabelledByElements;
+      ariaOwnsElementsArray = cachingInvariantMain.ariaOwnsElements;
+
+      assert_equals(ariaControlsElementsArray, cachingInvariantMain.ariaControlsElements, "Caching invariant for ariaControlsElements");
+      assert_equals(ariaDescribedByElementsArray, cachingInvariantMain.ariaDescribedByElements, "Caching invariant for ariaDescribedByElements");
+      assert_equals(ariaDetailsElementsArray, cachingInvariantMain.ariaDetailsElements, "Caching invariant for ariaDetailsElements");
+      assert_equals(ariaFlowToElementsArray, cachingInvariantMain.ariaFlowToElements, "Caching invariant for ariaFlowToElements");
+      assert_equals(ariaLabelledByElementsArray, cachingInvariantMain.ariaLabelledByElements, "Caching invariant for ariaLabelledByElements");
+      assert_equals(ariaOwnsElementsArray, cachingInvariantMain.ariaOwnsElements, "Caching invariant for ariaOwnsElements");
+
     }, "Caching invariant different attributes.");
   </script>
 
diff --git a/tests/wpt/tests/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html b/tests/wpt/tests/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html
new file mode 100644
index 00000000000..78bfb80e6fc
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/bidi-rendering/unicode-bidi-ua-rules.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>unicode-bidi UA stylesheet rules</title>
+<link rel="author" href="masonf@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#bidi-rendering">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<body>
+<script>
+  const elements = ['address', 'blockquote', 'center', 'div', 'figure',
+      'figcaption', 'footer', 'form', 'header', 'hr', 'legend', 'listing',
+      'main', 'p', 'plaintext', 'pre', 'summary', 'xmp', 'article', 'aside',
+      'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hgroup', 'nav', 'section', 'search',
+      'table', 'caption', 'colgroup', 'col', 'thead', 'tbody', 'tfoot', 'tr',
+      'td', 'th', 'dir', 'dd', 'dl', 'dt', 'menu', 'ol', 'ul', 'li', 'bdi',
+      'output'];
+  for(let tagname of elements) {
+    test((t) => {
+      const element = document.createElement(tagname);
+      t.add_cleanup(() => element.remove());
+      document.body.appendChild(element);
+      assert_equals(window.getComputedStyle(element, "").unicodeBidi,'isolate');
+    },`UA stylesheet rule for unicode-bidi, for <${tagname}>`);
+  }
+</script>
diff --git a/tests/wpt/tests/html/rendering/non-replaced-elements/flow-content-0/search-styles-iso-8859-8.html b/tests/wpt/tests/html/rendering/non-replaced-elements/flow-content-0/search-styles-iso-8859-8.html
index 19445662274..343e97f5047 100644
--- a/tests/wpt/tests/html/rendering/non-replaced-elements/flow-content-0/search-styles-iso-8859-8.html
+++ b/tests/wpt/tests/html/rendering/non-replaced-elements/flow-content-0/search-styles-iso-8859-8.html
@@ -19,7 +19,7 @@ legend, listing, main, p, plaintext, pre, summary, xmp, article, aside, h1, h2,
 h3, h4, h5, h6, hgroup, nav, section, search, table, caption, colgroup, col,
 thead, tbody, tfoot, tr, td, th, dir, dd, dl, dt, menu, ol, ul, li, bdi, output,
 [dir=ltr i], [dir=rtl i], [dir=auto i], * /* only apply to the bogus namespace */ {
-  unicode-bidi: bidi-override;
+  unicode-bidi: isolate;
 }
 
 </style>
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/select-parsing.tentative.html b/tests/wpt/tests/html/semantics/forms/the-select-element/select-parsing.tentative.html
index d3576a26b7f..31133446d4d 100644
--- a/tests/wpt/tests/html/semantics/forms/the-select-element/select-parsing.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/select-parsing.tentative.html
@@ -17,36 +17,34 @@
 </select>
 
 <select id=s2>
-  <div>div 1</div>
-  <button>
-    <span>level 1</span>
-    <button>
-      <span>level 2</span>
-    </button>
-  </button>
-  <div>div 2</div>
-</select>
-
-<select id=s3>
   <button>button
 </select>
 
-<select id=s4>
+<select id=s3>
   <datalist>datalist
 </select>
 
-<select id=s5>
+<select id=s4>
   <button>
     <select></select>
   </button>
 </select>
 
-<select id=s6>
+<select id=s5>
   <button>
     <div>
       <select>
 </select>
 
+<select id=s6>
+<button>
+<button></button>
+</button>
+<datalist>
+<datalist></datalist>
+</datalist>
+</select>
+
 <div id=afterlast>
   keep this div after the last test case
 </div>
@@ -70,45 +68,44 @@ test(() => {
 test(() => {
   assert_equals(document.getElementById('s2').parentNode, document.body);
   assert_equals(document.getElementById('s2').innerHTML, `
-  div 1
-  <button>
-    <span>level 1</span>
-    </button><button>
-      <span>level 2</span>
-    </button>
-  \n  div 2
-`);
-}, 'Nested <button>s in <select> should be flattened out.');
-
-test(() => {
-  assert_equals(document.getElementById('s3').parentNode, document.body);
-  assert_equals(document.getElementById('s3').innerHTML, `
   <button>button
 </button>`);
 }, '</select> should close <button>.');
 
 test(() => {
-  assert_equals(document.getElementById('s4').parentNode, document.body);
-  assert_equals(document.getElementById('s4').innerHTML, `
+  assert_equals(document.getElementById('s3').parentNode, document.body);
+  assert_equals(document.getElementById('s3').innerHTML, `
   <datalist>datalist
 </datalist>`);
 }, '</select> should close <datalist>.');
 
 test(() => {
-  assert_equals(document.getElementById('s5').parentNode, document.body);
-  assert_equals(document.getElementById('s5').innerHTML, `
+  assert_equals(document.getElementById('s4').parentNode, document.body);
+  assert_equals(document.getElementById('s4').innerHTML, `
   <button>
     </button>`);
 }, '<select> in <button> in <select> should remove inner <select>.');
 
 test(() => {
-  assert_equals(document.getElementById('s6').parentNode, document.body);
-  assert_equals(document.getElementById('s6').innerHTML, `
+  assert_equals(document.getElementById('s5').parentNode, document.body);
+  assert_equals(document.getElementById('s5').innerHTML, `
   <button>
     <div>
       </div></button>`);
 }, '<select> in <select><button><div> should remove inner <select>.');
 
+test(() => {
+  assert_equals(document.getElementById('s6').parentNode, document.body);
+  assert_equals(document.getElementById('s6').innerHTML, `
+<button>
+</button>
+
+<datalist>
+</datalist>
+
+`);
+}, 'Nested <button>s or <datalist>s in <select> should be dropped.');
+
 test(() => {
   assert_equals(document.getElementById('afterlast').parentNode, document.body);
 }, 'The last test should not leave any tags open after parsing.');
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-option-arbitrary-content-displayed-ref.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-option-arbitrary-content-displayed-ref.tentative.html
index 61b1c1a7108..126bbc5dd76 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-option-arbitrary-content-displayed-ref.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-option-arbitrary-content-displayed-ref.tentative.html
@@ -25,8 +25,8 @@
     /* Per settings in test file: */
     width: fit-content;
     height: fit-content;
-    background: -internal-light-dark(white, black);
-    color: -internal-light-dark(black, white);
+    background: light-dark(white, black);
+    color: light-dark(black, white);
     border: 1px solid rgba(0, 0, 0, 1);
     border-radius: 0px;
     box-shadow: 0px 12.8px 28.8px rgba(0, 0, 0, 0.13), 0px 0px 9.2px rgba(0, 0, 0, 0.11);
diff --git a/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html b/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
index 8d80cb44548..b19c1d3adcb 100644
--- a/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
+++ b/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
@@ -102,9 +102,11 @@
     let called = false;
     assert_false(svgInvokee instanceof HTMLElement);
     assert_true(svgInvokee instanceof Element);
+    let eventInvoker = null;
     svgInvokee.addEventListener(
       "invoke",
       (event) => {
+        eventInvoker = event.invoker;
         called = true;
       },
       { once: true },
@@ -112,5 +114,6 @@
     invokerbutton.invokeTargetElement = svgInvokee;
     await clickOn(invokerbutton);
     assert_true(called, "event was called");
+    assert_true(eventInvoker == svgInvokee, "event invoker is set to right element");
   }, "event dispatches if invoker is non-HTML Element");
 </script>
diff --git a/tests/wpt/tests/html/semantics/invokers/invoketarget-generic-eventtarget-crash.tentative.html b/tests/wpt/tests/html/semantics/invokers/invoketarget-generic-eventtarget-crash.tentative.html
new file mode 100644
index 00000000000..b2179640ddf
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/invoketarget-generic-eventtarget-crash.tentative.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<div id="invoker"></div>
+
+<script type="module">
+  const invokeEvent = new InvokeEvent('invoke', { bubbles: true });
+  document.body.addEventListener('invoke', e => {
+    e.invoker.toString();
+  });
+  invoker.addEventListener('invoke', e => {
+    e.invoker.toString();
+  });
+  invoker.dispatchEvent(invokeEvent);
+  await Promise.resolve();
+  invokeEvent.invoker.toString();
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-attribute-basic.html b/tests/wpt/tests/html/semantics/popovers/popover-attribute-basic.html
index 13108949cb3..2af3bbc137f 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-attribute-basic.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-attribute-basic.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
 <link rel=help href="https://open-ui.org/components/popover.research.explainer">
 <meta name="timeout" content="long">
 <script src="/resources/testharness.js"></script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-anchor.tentative.html b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-anchor.tentative.html
new file mode 100644
index 00000000000..4520ab05770
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-anchor.tentative.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
+<link rel=help href="https://open-ui.org/components/popover.research.explainer">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/common/top-layer.js"></script>
+<script src="resources/popover-utils.js"></script>
+<script src="resources/popover-top-layer-nesting.js"></script>
+
+<div id=tests>
+  <div> Single popover=auto ancestor
+    <div popover=auto class=target data-stay-open=true></div>
+  </div>
+
+  <div> Single popover=manual ancestor
+    <div popover=auto class=target data-stay-open=true></div>
+  </div>
+
+  <div> Nested popover=auto ancestors
+    <div popover=auto data-stay-open=true>
+      <div popover=auto class=target data-stay-open=true></div>
+    </div>
+  </div>
+
+  <div> Nested popover=auto ancestors, target is outer
+    <div popover=auto class=target data-stay-open=true>
+      <div popover=auto data-stay-open=false></div>
+    </div>
+  </div>
+
+  <div> Top layer inside of nested element
+    <div popover=auto data-stay-open=true>
+      <button class=target></button>
+    </div>
+  </div>
+</div>
+
+<script>
+  const tests = Array.from(document.querySelectorAll('#tests>div'));
+  runTopLayerTests(tests,/*testAnchorAttribute*/true);
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-hints.tentative.html b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-hints.tentative.html
new file mode 100644
index 00000000000..4ec1f49bda9
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting-hints.tentative.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
+<link rel=help href="https://open-ui.org/components/popover.research.explainer">
+<link rel=help href="https://open-ui.org/components/popover-hint.research.explainer">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/common/top-layer.js"></script>
+<script src="resources/popover-utils.js"></script>
+<script src="resources/popover-top-layer-nesting.js"></script>
+
+<div id=tests>
+  <div> Single popover=hint ancestor
+    <div popover=hint class=target data-stay-open=true></div>
+  </div>
+
+  <div> Nested auto/hint ancestors
+    <div popover=auto data-stay-open=true>
+      <div popover=hint class=target data-stay-open=true></div>
+    </div>
+  </div>
+
+  <div> Nested auto/hint ancestors, target is auto
+    <div popover=auto class=target data-stay-open=true>
+      <div popover=hint data-stay-open=false></div>
+    </div>
+  </div>
+
+  <div> Unrelated hint, target=hint
+    <div popover=auto data-stay-open=true></div>
+    <div popover=hint class=target data-stay-open=true></div>
+  </div>
+
+  <div> Unrelated hint, target=auto
+    <div popover=auto class=target data-stay-open=true></div>
+    <div popover=hint data-stay-open=false></div>
+  </div>
+</div>
+
+<script>
+  const tests = Array.from(document.querySelectorAll('#tests>div'));
+  runTopLayerTests(tests);
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting.tentative.html b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting.tentative.html
new file mode 100644
index 00000000000..a0b3b60b72b
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-nesting.tentative.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
+<link rel=help href="https://open-ui.org/components/popover.research.explainer">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/common/top-layer.js"></script>
+<script src="resources/popover-utils.js"></script>
+<script src="resources/popover-top-layer-nesting.js"></script>
+
+<div id=tests>
+  <div> Single popover=auto ancestor
+    <div popover=auto class=target data-stay-open=true></div>
+  </div>
+
+  <div> Single popover=manual ancestor
+    <div popover=auto class=target data-stay-open=true></div>
+  </div>
+
+  <div> Nested popover=auto ancestors
+    <div popover=auto data-stay-open=true>
+      <div popover=auto class=target data-stay-open=true></div>
+    </div>
+  </div>
+
+  <div> Nested popover=auto ancestors, target is outer
+    <div popover=auto class=target data-stay-open=true>
+      <div popover=auto data-stay-open=false></div>
+    </div>
+  </div>
+
+  <div> Top layer inside of nested element
+    <div popover=auto data-stay-open=true>
+      <button class=target></button>
+    </div>
+  </div>
+</div>
+
+<script>
+  const tests = Array.from(document.querySelectorAll('#tests>div'));
+  runTopLayerTests(tests);
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popovertarget-reflection.html b/tests/wpt/tests/html/semantics/popovers/popovertarget-reflection.html
new file mode 100644
index 00000000000..7f265ae4eb5
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popovertarget-reflection.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1523410">
+<link rel=help href="https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#reflecting-content-attributes-in-idl-attributes:element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<button id=mybutton>toggle popover</button>
+<div id=mypopover popover=auto>popover</div>
+
+<script>
+test(() => {
+  mybutton.popoverTargetElement = mypopover;
+  assert_true(mybutton.hasAttribute('popovertarget'),
+    'Assigning to element.popoverTargetElement should set the popovertarget attribute.');
+
+  mybutton.removeAttribute('popovertarget');
+  assert_equals(mybutton.popoverTargetElement, null,
+    'Removing the popovertarget attribute should remove the element from element.popoverTargetElement.');
+}, 'Element attribute reflection of popoverTargetElement/popovertarget should be kept in sync.');
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/resources/popover-top-layer-nesting.js b/tests/wpt/tests/html/semantics/popovers/resources/popover-top-layer-nesting.js
new file mode 100644
index 00000000000..ace10b3f7bc
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/resources/popover-top-layer-nesting.js
@@ -0,0 +1,108 @@
+function createTopLayerElement(t,topLayerType) {
+  let element, show, showing;
+  switch (topLayerType) {
+    case 'dialog':
+      element = document.createElement('dialog');
+      show = () => element.showModal();
+      showing = () => element.matches(':modal');
+      break;
+    case 'fullscreen':
+      element = document.createElement('div');
+      show = async (topmostElement) => {
+        // Be sure to add user activation to the topmost visible target:
+        await blessTopLayer(topmostElement);
+        await element.requestFullscreen();
+      };
+      showing = () => document.fullscreenElement === element;
+      break;
+    default:
+      assert_unreached('Invalid top layer type');
+  }
+  t.add_cleanup(() => element.remove());
+  return {element,show,showing};
+}
+function runTopLayerTests(testCases, testAnchorAttribute) {
+  testAnchorAttribute = testAnchorAttribute || false;
+  testCases.forEach(test => {
+    const description = test.firstChild.data.trim();
+    assert_equals(test.querySelectorAll('.target').length,1,'There should be exactly one target');
+    const target = test.querySelector('.target');
+    assert_true(!!target,'Invalid test case');
+    const popovers = Array.from(test.querySelectorAll('[popover]'));
+    assert_true(popovers.length > 0,'No popovers found');
+    ['dialog','fullscreen'].forEach(topLayerType => {
+      promise_test(async t => {
+        const {element,show,showing} = createTopLayerElement(t,topLayerType);
+        target.appendChild(element);
+
+        // Show the popovers.
+        t.add_cleanup(() => popovers.forEach(popover => popover.hidePopover()));
+        popovers.forEach(popover => popover.showPopover());
+        popovers.forEach(popover => assert_true(popover.matches(':popover-open'),'All popovers should be open'));
+
+        // Activate the top layer element.
+        await show(popovers[popovers.length-1]);
+        assert_true(showing());
+        popovers.forEach(popover => assert_equals(popover.matches(':popover-open'),popover.dataset.stayOpen==='true','Incorrect behavior'));
+
+        // Add another popover within the top layer element and make sure entire stack stays open.
+        const newPopover = document.createElement('div');
+        t.add_cleanup(() => newPopover.remove());
+        newPopover.popover = popoverHintSupported() ? 'hint' : 'auto';
+        element.appendChild(newPopover);
+        popovers.forEach(popover => assert_equals(popover.matches(':popover-open'),popover.dataset.stayOpen==='true','Adding another popover shouldn\'t change anything'));
+        assert_true(showing(),'top layer element should still be top layer');
+        newPopover.showPopover();
+        assert_true(newPopover.matches(':popover-open'));
+        popovers.forEach(popover => assert_equals(popover.matches(':popover-open'),popover.dataset.stayOpen==='true','Showing the popover shouldn\'t change anything'));
+        assert_true(showing(),'top layer element should still be top layer');
+      },`${description} with ${topLayerType}`);
+
+      promise_test(async t => {
+        const {element,show,showing} = createTopLayerElement(t,topLayerType);
+        element.popover = popoverHintSupported() ? 'hint' : 'auto';
+        target.appendChild(element);
+
+        // Show the popovers.
+        t.add_cleanup(() => popovers.forEach(popover => popover.hidePopover()));
+        popovers.forEach(popover => popover.showPopover());
+        popovers.forEach(popover => assert_true(popover.matches(':popover-open'),'All popovers should be open'));
+        const targetWasOpenPopover = target.matches(':popover-open');
+
+        // Show the top layer element as a popover first.
+        element.showPopover();
+        assert_true(element.matches(':popover-open'),'element should be open as a popover');
+        assert_equals(target.matches(':popover-open'),targetWasOpenPopover,'target shouldn\'t change popover state');
+
+        try {
+          await show(element);
+          assert_unreached('It is an error to activate a top layer element that is already a showing popover');
+        } catch (e) {
+          // We expect an InvalidStateError for dialogs, and a TypeError for fullscreens.
+          // Anything else should fall through to the test harness.
+          if (e.name !== 'InvalidStateError' && e.name !== 'TypeError') {
+            throw e;
+          }
+        }
+      },`${description} with ${topLayerType}, top layer element *is* a popover`);
+
+      if (testAnchorAttribute) {
+        promise_test(async t => {
+          const {element,show,showing} = createTopLayerElement(t,topLayerType);
+          element.anchorElement = target;
+          document.body.appendChild(element);
+
+          // Show the popovers.
+          t.add_cleanup(() => popovers.forEach(popover => popover.hidePopover()));
+          popovers.forEach(popover => popover.showPopover());
+          popovers.forEach(popover => assert_true(popover.matches(':popover-open'),'All popovers should be open'));
+
+          // Activate the top layer element.
+          await show(popovers[popovers.length-1]);
+          assert_true(showing());
+          popovers.forEach(popover => assert_equals(popover.matches(':popover-open'),popover.dataset.stayOpen==='true','Incorrect behavior'));
+        },`${description} with ${topLayerType}, anchor attribute`);
+      }
+    });
+  });
+}
diff --git a/tests/wpt/tests/html/syntax/parsing/support/svg-script-self-closing.js b/tests/wpt/tests/html/syntax/parsing/support/svg-script-self-closing.js
new file mode 100644
index 00000000000..6dd286e7bc0
--- /dev/null
+++ b/tests/wpt/tests/html/syntax/parsing/support/svg-script-self-closing.js
@@ -0,0 +1 @@
+scriptSelfClosing = true;
diff --git a/tests/wpt/tests/html/syntax/parsing/unclosed-svg-script.html b/tests/wpt/tests/html/syntax/parsing/unclosed-svg-script.html
index e4048615072..ce7b89cb10e 100644
--- a/tests/wpt/tests/html/syntax/parsing/unclosed-svg-script.html
+++ b/tests/wpt/tests/html/syntax/parsing/unclosed-svg-script.html
@@ -8,6 +8,7 @@
     var scriptWithoutEndTagRan = false;
     var scriptWithBogusEndTagInsideRan = false;
     var scriptWithBreakout = false;
+    var scriptSelfClosing = false;
 </script>
 <svg>
     <script>scriptWithEndTagRan = true;</script>
@@ -21,6 +22,9 @@
 <svg>
     <script>scriptWithBreakout = true;<s></script>
 </svg>
+<svg>
+    <script href="support/svg-script-self-closing.js"/>
+</svg>
 </s>
 <script>
     test(function() {
@@ -35,4 +39,7 @@
     test(function() {
         assert_false(scriptWithBreakout);
     }, "SVG scripts ended by HTML breakout should not run");
+    test(function() {
+        assert_true(scriptSelfClosing);
+    }, "SVG scripts with self-closing start tag should run");
 </script>
diff --git a/tests/wpt/tests/interfaces/observable.tentative.idl b/tests/wpt/tests/interfaces/observable.tentative.idl
new file mode 100644
index 00000000000..3ccd486a202
--- /dev/null
+++ b/tests/wpt/tests/interfaces/observable.tentative.idl
@@ -0,0 +1,31 @@
+[Exposed=*]
+interface Subscriber {
+  undefined next(any value);
+  undefined error(any error);
+  undefined complete();
+  undefined addTeardown(VoidFunction teardown);
+  readonly attribute boolean active;
+  readonly attribute AbortSignal signal;
+};
+
+
+callback SubscribeCallback = undefined (Subscriber subscriber);
+callback SubscriptionObserverCallback = undefined (any value);
+
+dictionary SubscriptionObserver {
+  SubscriptionObserverCallback next;
+  SubscriptionObserverCallback error;
+  VoidFunction complete;
+};
+
+typedef (SubscriptionObserverCallback or Observer) ObserverUnion;
+
+dictionary SubscribeOptions {
+  AbortSignal signal;
+};
+
+[Exposed=*]
+interface Observable {
+  constructor(SubscribeCallback callback);
+  undefined subscribe(optional ObserverUnion observer = {}, optional SubscribeOptions options = {});
+};
diff --git a/tests/wpt/tests/lint.ignore b/tests/wpt/tests/lint.ignore
index 2c0bc36c49e..b5f6b2e4a3c 100644
--- a/tests/wpt/tests/lint.ignore
+++ b/tests/wpt/tests/lint.ignore
@@ -745,5 +745,6 @@ HTML INVALID SYNTAX: domparsing/DOMParser-parseFromString-xml-doctype.html
 HTML INVALID SYNTAX: domparsing/DOMParser-parseFromString-xml-parsererror.html
 HTML INVALID SYNTAX: domparsing/XMLSerializer-serializeToString.html
 HTML INVALID SYNTAX: html/canvas/element/manual/unclosed-canvas-4.htm
+HTML INVALID SYNTAX: html/syntax/parsing/unclosed-svg-script.html
 HTML INVALID SYNTAX: quirks/percentage-height-calculation.html
 HTML INVALID SYNTAX: trusted-types/TrustedTypePolicyFactory-getAttributeType-namespace.html
diff --git a/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002-ref.html b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002-ref.html
new file mode 100644
index 00000000000..03ecf299442
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head><title>Test dir=rtl</title></head>
+  <body style="background: white;">
+
+    <div style="position: absolute; top: 0px; left: 0px;">
+      <div style="width: 40px; height: 3000px; background: black;"></div>
+    </div>
+
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002.html b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002.html
new file mode 100644
index 00000000000..8840eaed56a
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-002.html
@@ -0,0 +1,120 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on various containers</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
+    <meta name="assert" content="Verify dir attribute on various elements.">
+    <link rel="match" href="direction-overall-002-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+      math {
+          font: 25px/1 Ahem;
+      }
+    </style>
+  </head>
+
+  </head>
+  <body style="background: white;">
+
+    <!-- The visible part of the formulas below should be covered by the
+         black rectangle when dir=rtl -->
+
+    <div style="position: absolute; top: 5px; left: 5px;">
+      <!-- msup -->
+      <math dir="rtl">
+        <msup>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="red"/>
+        </msup>
+      </math><br/>
+      <!-- msub -->
+      <math dir="rtl">
+        <msub>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="orange"/>
+        </msub>
+      </math><br/>
+      <!-- msubsup -->
+      <math dir="rtl">
+        <msubsup>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="green"/>
+          <mspace width="20px" height="20px" mathbackground="blue"/>
+        </msubsup>
+      </math><br/>
+      <!-- mmultiscripts -->
+      <math dir="rtl">
+        <mmultiscripts>
+          <mspace/>
+          <mspace width="20px" height="20px" mathbackground="cyan"/>
+          <mspace width="20px" height="20px" mathbackground="yellow"/>
+          <mprescripts/>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px"/>
+        </mmultiscripts>
+      </math><br/>
+      <!-- munder (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <munder>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="magenta"/>
+        </munder>
+      </math><br/>
+      <!-- mover (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <mover>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="cyan"/>
+        </mover>
+      </math><br/>
+      <!-- munderover (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <munderover>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="yellow"/>
+          <mspace width="20px" height="20px" mathbackground="grey"/>
+        </munderover>
+      </math><br/>
+      <!-- mroot -->
+      <math dir="rtl">
+        <mstyle mathcolor="white">
+          <mroot>
+            <mspace width="20px" height="20px" mathbackground="orange"/>
+            <mspace width="20px" height="20px"/>
+          </mroot>
+        </mstyle>
+      </math><br/>
+      <!-- msqrt -->
+      <math dir="rtl">
+        <mstyle mathcolor="white">
+          <msqrt>
+            <!-- Here, we assume that (width of radical + width of mspace)
+                 is greater than the width of the black rectangle (i.e.
+                 width of radical > 30 - 25 = 5px), so the test fails if the
+                 radical is placed on the left. -->
+            <mspace width="25px" height="20px" mathbackground="grey"/>
+          </msqrt>
+        </mstyle>
+      </math>
+    </div>
+
+    <div style="position: absolute; top: 0px; left: 0px;">
+      <div style="width: 40px; height: 3000px; background: black"></div>
+    </div>
+
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003-ref.html b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003-ref.html
new file mode 100644
index 00000000000..3ecbcd0a6f9
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head><title>Test dir=rtl</title></head>
+  <body>
+
+    <div style="position: absolute;
+                top: 5px; left: 5px; width: 200px; height: 200px;">
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 0px; background: red;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 70px; background: green;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 140px; background: magenta;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 210px; background: blue;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 280px; background: yellow;"></div>-->
+    </div>
+
+
+    <div style="position: absolute;
+                top: 5px; left: 5px; width: 200px; height: 200px;">
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: -5px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 65px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 135px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 205px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 275px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 345px; background: black;"></div>
+    </div>
+
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003.html b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003.html
new file mode 100644
index 00000000000..7acc0f65c1b
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/direction/direction-overall-003.html
@@ -0,0 +1,94 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on various containers</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
+    <meta name="assert" content="Verify dir attribute on various mmultiscripts.">
+    <link rel="match" href="direction-overall-003-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+      math {
+          /* Ensure the space after script is 30px */
+          font: 10px spaceafterscript3000;
+      }
+      @font-face {
+          font-family: spaceafterscript3000;
+          src: url("/fonts/math/scripts-spaceafterscript3000.woff");
+      }
+    </style>
+  </head>
+  <body>
+
+    <!-- mmultiscripts. The formulas
+
+         1 3                 3 1
+          X  in dir=ltr  and  X  in dir=rtl
+         2 4                 4 2
+
+         do not match perfectly, so we use an alternative == reftest here
+         which is less strict. -->
+
+    <!-- five vertical bands: red, green, magenta, blue and yellow -->
+    <div style="position: absolute;
+                top: 5px; left: 5px; width: 200px; height: 200px;">
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 0px; background: red;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 70px; background: green;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 140px; background: magenta;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 210px; background: blue;"></div>
+      <div style="position: absolute; width: 70px; height: 200px;
+                  left: 280px; background: yellow;"></div>-->
+    </div>
+
+    <!-- a mmultiscripts element whose children are squares of different
+         colors. In dir=rtl, the color of each square should match the one of
+         the band over which the square is positioned. Hence, this
+         mmultiscripts should not be visible. -->
+    <div style="position: absolute;
+                top: 5px; left: 5px; width: 200px; height: 200px;">
+      <math dir="rtl">
+        <mmultiscripts>
+          <mspace width="40px" height="40px" mathbackground="magenta"/>
+
+          <mspace width="40px" height="40px" mathbackground="green"/>
+          <mspace width="40px" height="40px" mathbackground="green"/>
+
+          <mspace width="40px" height="40px" mathbackground="red"/>
+          <mspace width="40px" height="40px" mathbackground="red"/>
+
+           <mprescripts/>
+
+          <mspace width="40px" height="40px" mathbackground="yellow"/>
+          <mspace width="40px" height="40px" mathbackground="yellow"/>
+
+          <mspace width="40px" height="40px" mathbackground="blue"/>
+          <mspace width="40px" height="40px" mathbackground="blue"/>
+        </mmultiscripts>
+      </math>
+    </div>
+
+    <!-- We add black vertical bands to cover spaces between the children of
+         mmultiscripts. -->
+    <div style="position: absolute;
+                top: 5px; left: 5px; width: 200px; height: 200px;">
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: -5px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 65px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 135px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 205px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 275px; background: black;"></div>
+      <div style="position: absolute; width: 10px; height: 200px;
+                  left: 345px; background: black;"></div>
+    </div>
+
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4-ref.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4-ref.html
new file mode 100644
index 00000000000..a084a81f0bb
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mfrac childnode update</title>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%">
+        <mfrac>
+          <mi>a</mi>
+          <mi>b</mi>
+        </mfrac>
+        <mfrac>
+          <mi>c</mi>
+          <mi>d</mi>
+        </mfrac>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html
new file mode 100644
index 00000000000..66665620e38
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac childnode update</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="A dynamically created mfrac should render like the equivalent markup.">
+    <link rel="match" href="frac-created-dynamically-4-ref.html">
+    <script type="text/javascript">
+      function doTest() {
+        var x = document.getElementById("innerMfrac");
+        var y = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
+        var z = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
+        y.innerHTML = "c";
+        z.innerHTML = "d";
+        x.appendChild(y);
+        x.appendChild(z);
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%">
+        <mfrac>
+          <mi>a</mi>
+          <mi>b</mi>
+        </mfrac>
+        <mfrac id="innerMfrac">
+        </mfrac>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005-ref.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005-ref.html
new file mode 100644
index 00000000000..1c231455bf5
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mfrac linethickness</title>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005.html
new file mode 100644
index 00000000000..9ecc636215a
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-005.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac linethickness</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="Test dynamically removing a linethickness larger than 100%">
+    <link rel="match" href="frac-linethickness-005-ref.html">
+    <script type="text/javascript">
+      function doTest() {
+        document.getElementById("testMfrac").removeAttribute("linethickness");
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac id="testMfrac" style="font-size: 300%" linethickness="200%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006-ref.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006-ref.html
new file mode 100644
index 00000000000..1c231455bf5
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mfrac linethickness</title>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006.html
new file mode 100644
index 00000000000..4ee477b8139
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-006.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac linethickness</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="Test dynamically removing a linethickness smaller than 100%">
+    <link rel="match" href="frac-linethickness-006-ref.html">
+    <script type="text/javascript">
+      function doTest() {
+        document.getElementById("testMfrac").removeAttribute("linethickness");
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac id="testMfrac" style="font-size: 300%" linethickness="50%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007-ref.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007-ref.html
new file mode 100644
index 00000000000..c5d73a9bba7
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mfrac linethickness</title>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%" linethickness="200%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007.html
new file mode 100644
index 00000000000..8702c3c698c
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-007.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac linethickness</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="Test dynamically setting the linethickness to a value larger than 100%">
+    <link rel="match" href="frac-linethickness-007-ref.html">
+    <script type="text/javascript">
+      function doTest() {
+        document.getElementById("testMfrac").setAttribute("linethickness","200%");
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac id="testMfrac" style="font-size: 300%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008-ref.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008-ref.html
new file mode 100644
index 00000000000..0a6155e7859
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mfrac linethickness</title>
+  </head>
+  <body>
+    <math>
+      <mfrac style="font-size: 300%" linethickness="50%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008.html b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008.html
new file mode 100644
index 00000000000..8e5bfe89f51
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/fractions/frac-linethickness-008.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac linethickness</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+    <meta name="assert" content="Test dynamically setting the linethickness to a value smaller than 100%">
+    <link rel="match" href="frac-linethickness-008-ref.html">
+    <script type="text/javascript">
+      function doTest() {
+        document.getElementById("testMfrac").setAttribute("linethickness","50%");
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac id="testMfrac" style="font-size: 300%" linethickness="300%">
+        <mi>a</mi>
+        <mi>b</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2-ref.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2-ref.html
new file mode 100644
index 00000000000..c13f9b1739a
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <math>
+    <mo>1</mo>
+  </math>
+  <p>
+  <math>
+    <mo>2</mo>
+  </math>
+  <p>
+  <math>
+    <mo>3</mo>
+  </math>
+  <p>
+  <math>
+    <mo>4</mo>
+  </math>
+  <p>
+  <table>
+    <tr>
+      <td style="border: 1px solid;">
+        <math>
+          <mo>x</mo>
+        </math>
+      </td>
+    </tr>
+  </table>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2.html
new file mode 100644
index 00000000000..d5511a8ea84
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-2.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <link rel="match" href="mo-invisibleoperators-2-ref.html">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
+    <link rel="help" href="This test verifies proper invalidation after dynamically replacing the text of invisible operators.">
+    <meta name="assert" content="https://bugzilla.mozilla.org/show_bug.cgi?id=522393">
+  </head>
+  <body>
+  <math>
+    <mo id="mo1">&#x2061;<!-- FUNCTION APPLICATION --></mo>
+  </math>
+  <p>
+  <math>
+    <mo id="mo2">&#x2062;<!-- INVISIBLE TIMES --></mo>
+  </math>
+  <p>
+  <math>
+    <mo id="mo3">&#x2063;<!-- INVISIBLE SEPARATOR --></mo>
+  </math>
+  <p>
+  <math>
+    <mo id="mo4">&#x2064;<!-- INVISIBLE PLUS --></mo>
+  </math>
+  <p>
+  <!-- Test preferred width after dynamic change-->
+  <table>
+    <tr>
+      <td style="border: 1px solid;">
+        <math>
+          <mo id="mo5">&ApplyFunction;</mo>
+        </math>
+      </td>
+    </tr>
+  </table>
+  <script type="text/javascript">
+    function doTest() {
+      document.getElementById('mo1').firstChild.data = '1';
+      document.getElementById('mo2').firstChild.data = '2';
+      document.getElementById('mo3').firstChild.data = '3';
+      document.getElementById('mo4').firstChild.data = '4';
+      document.getElementById('mo5').firstChild.data = 'x';
+      document.documentElement.removeAttribute("class");
+    }
+    window.addEventListener("TestRendered", doTest);
+  </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-ref.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-ref.html
new file mode 100644
index 00000000000..2b7d9c6add5
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <math>
+    <mrow>
+      <mn>1</mn>
+      <mn>2</mn>
+      <mn>3</mn>
+      <mn>4</mn>
+      <mn>5</mn>
+      <mspace height="2em" width="0.1em"></mspace>
+    </mrow>
+  </math>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators.html
new file mode 100644
index 00000000000..d027b6491ff
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-invisibleoperators.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <link rel="match" href="mo-invisibleoperators-ref.html">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
+    <link rel="help" href="This test verifies that invisible operators rendered with the default fonts do not add spacing, foreground or background.">
+    <meta name="assert" content="https://bugzilla.mozilla.org/show_bug.cgi?id=969867">
+    <meta name="assert" content="https://bugzilla.mozilla.org/show_bug.cgi?id=522393">
+  </head>
+  <math>
+    <mrow>
+      <mn>1</mn>
+      <mo>&#x2061;<!-- FUNCTION APPLICATION --></mo>
+      <mn>2</mn>
+      <mo>&#x2062;<!-- INVISIBLE TIMES --></mo>
+      <mn>3</mn>
+      <mo>&#x2063;<!-- INVISIBLE SEPARATOR --></mo>
+      <mn>4</mn>
+      <mo>&#x2064;<!-- INVISIBLE PLUS --></mo>
+      <mn>5</mn>
+      <!-- Hack.  The invisible operators may not belong to the same font as
+           the numbers, so they may have different heights.  The mspace
+           compensates for this by ensuring the height of the mrow does not
+           depend on character height -->
+      <mspace height="2em" width="0.1em"></mspace>
+    </mrow>
+  </math>
+  <p>
+  <!-- Should be invisible -->
+  <math>
+    <mo style="background: red; color: blue;">&ApplyFunction;</mo>
+  </math>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic-ref.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic-ref.html
index ee5bce2ca82..cd1aafb4b71 100644
--- a/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic-ref.html
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic-ref.html
@@ -1,15 +1,15 @@
 <!DOCTYPE html>
 <html>
-   <head>
-     <meta charset="utf-8"/>
-     <title>Test dynamically removing movablelimits attribute</title>
-   </head>
-   <body>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Test dynamically removing movablelimits attribute</title>
+  </head>
+  <body>
     <math>
       <munder>
         <mo>∑</mo>
         <mi>x</mi>
       </munder>
     </math>
-   </body>
- </html>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic.html b/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic.html
index 647fc523217..cf6d0ffa5b6 100644
--- a/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic.html
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/mo-movablelimits-dynamic.html
@@ -1,20 +1,20 @@
 <!DOCTYPE html>
 <html class="reftest-wait">
-   <head>
-     <meta charset="utf-8"/>
-     <title>Test dynamically removing movablelimits attribute</title>
-     <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
-     <link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript">
-     <meta name="assert" content="Verifies dynamically removing movablelimits.">
-     <link rel="match" href="mo-movablelimits-dynamic-ref.html">
-     <script>
-        window.addEventListener("load", () => {
-         document.getElementById('a').removeAttribute('movablelimits');
-         document.documentElement.classList.remove('reftest-wait');
-       });
-     </script>
-    </head>
-    <body>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Test dynamically removing movablelimits attribute</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript">
+    <meta name="assert" content="Verifies dynamically removing movablelimits.">
+    <link rel="match" href="mo-movablelimits-dynamic-ref.html">
+    <script>
+      window.addEventListener("load", () => {
+        document.getElementById('a').removeAttribute('movablelimits');
+        document.documentElement.classList.remove('reftest-wait');
+      });
+    </script>
+  </head>
+  <body>
     <math>
       <munder>
         <mo id="a" movablelimits="false">∑</mo>
@@ -23,5 +23,5 @@
     </math>
     <script src="/mathml/support/feature-detection.js"></script>
     <script>MathMLFeatureDetection.ensure_for_match_reftest("has_munderover");</script>
-    </body>
+  </body>
 </html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001-ref.html b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001-ref.html
new file mode 100644
index 00000000000..3bfb2a3d839
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>munderover@accent</title>
+    <meta charset="utf-8"/>
+  </head>
+  <body>
+    <math>
+      <munderover accent="true"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001.html b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001.html
new file mode 100644
index 00000000000..6c3bc0d8300
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accent-dynamic-001.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>munderover@accent</title>
+    <meta charset="utf-8"/>
+    <link rel="help" href="https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover">
+    <meta name="assert" content="Verifies invalidation after accent attribute is dynamically set.">
+    <link rel="match" href="munderover-accent-dynamic-001-ref.html">
+    <script>
+      function doTest() {
+        document.getElementById('mathOperator').setAttribute('accent', 'true');
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <munderover id="mathOperator"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001-ref.html b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001-ref.html
new file mode 100644
index 00000000000..3c3d4abece0
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+ <html>
+   <head>
+     <title>munderover@accentunder</title>
+     <meta charset="utf-8"/>
+   </head>
+   <body>
+    <math>
+      <munderover accentunder="true"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>
+    </math>
+   </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001.html b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001.html
new file mode 100644
index 00000000000..33fc5b3f212
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/operators/munderover-accentunder-dynamic-001.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>munderover@accentunder</title>
+    <meta charset="utf-8"/>
+    <link rel="help" href="https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover">
+    <meta name="assert" content="Verifies invalidation after accentunder attribute is dynamically set.">
+    <link rel="match" href="munderover-accentunder-dynamic-001-ref.html">
+    <script>
+      function doTest() {
+        document.getElementById('mathOperator').setAttribute('accentunder', 'true');
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered",doTest);
+    </script>
+  </head>
+  <body>
+    <math>
+      <munderover id="mathOperator"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/spaces/space-3-ref.html b/tests/wpt/tests/mathml/presentation-markup/spaces/space-3-ref.html
new file mode 100644
index 00000000000..135a1475e23
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/spaces/space-3-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <title>mspace</title>
+</head>
+
+<body>
+
+  <div style="position: absolute;
+              top: 0; left: 0;
+              width: 50px; height: 6em;
+              background: red;"></div>
+
+  <div style="position: absolute;
+              top: 2em; left: 50px;
+              width: 40px; height: 3em;
+              background: green;"></div>
+
+  <div style="position: absolute;
+              top: 1em; left: 90px;
+              width: 30px; height: 3em;
+              background: blue;"></div>
+
+</body>
+
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/spaces/space-3.html b/tests/wpt/tests/mathml/presentation-markup/spaces/space-3.html
new file mode 100644
index 00000000000..d4f79ed25a3
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/spaces/space-3.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <title>mspace</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#space-mspace">
+    <link rel="match" href="space-3-ref.html"/>
+    <meta name="assert" content="Verify mspace visual rendering for different values of height, depth and width">
+</head>
+
+<body>
+
+  <math style="position: absolute; top: 0; left: 0; margin: 0; padding: 0;">
+    <mspace width="50px" height="3em" depth="3em" mathbackground="red"/>
+    <mspace width="40px" height="1em" depth="2em" mathbackground="green"/>
+    <mspace width="30px" height="2em" depth="1em" mathbackground="blue"/>
+  </math>
+
+</body>
+
+</html>
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-backpressure.worker.js b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-backpressure.worker.js
new file mode 100644
index 00000000000..9e03e650e0d
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-backpressure.worker.js
@@ -0,0 +1,56 @@
+// META: title=MediaStreamTrackProcessor backpressure tests.
+
+importScripts("/resources/testharness.js");
+
+const height = 240;
+const width = 320;
+
+const inputCanvas = new OffscreenCanvas(width, height);
+const inputCtx = inputCanvas.getContext('2d', {alpha: false});
+inputCtx.fillStyle = 'black';
+inputCtx.fillRect(0, 0, width, height);
+
+const frameDuration = 40;
+
+function makeUniformVideoFrame(timestamp) {
+  return new VideoFrame(inputCanvas, {timestamp, alpha: 'discard'});
+}
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  // Write frames for the duration of the test.
+  const writer = generator.writable.getWriter();
+  let timestamp = 0;
+  const intervalId = setInterval(
+    t.step_func(async () => {
+      if (generator.readyState === 'live') {
+        timestamp++;
+        await writer.write(makeUniformVideoFrame(timestamp));
+      }
+    }),
+    frameDuration);
+  t.add_cleanup(() => clearInterval(intervalId));
+  t.step_timeout(function() {
+    clearInterval(intervalId);
+    generator.track.stop();
+  }, 2000);
+  const processor = new MediaStreamTrackProcessor(generator);
+  let ts = 1;
+  await processor.readable.pipeTo(new WritableStream({
+    async write(frame) {
+      if (ts === 1) {
+        assert_equals(frame.timestamp, ts, "Timestamp mismatch");
+      } else {
+        assert_greater_than_equal(frame.timestamp, ts, "Backpressure should have resulted in skipping at least 3 frames");
+      }
+      frame.close();
+      ts+=3;
+      // Wait the equivalent of 3 frames
+      return new Promise((res) => t.step_timeout(res, 3*frameDuration));
+    }
+  }));
+}, "Tests that backpressure forces MediaStreamTrackProcess to skip frames");
+
+done();
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-with-window-tracks.https.html b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-with-window-tracks.https.html
new file mode 100644
index 00000000000..7d6b2c243a5
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor-with-window-tracks.https.html
@@ -0,0 +1,77 @@
+<!doctype html>
+<html>
+<head>
+  <title>MediaStreamTrackProcessor</title>
+  <link rel="help" href="https://w3c.github.io/mediacapture-insertable-streams">
+</head>
+<body>
+<p class="instructions">When prompted, use the accept button to give permission to use your audio and video devices.</p>
+<h1 class="instructions">Description</h1>
+<p class="instructions">This test checks that MediaStreamTrackProcessor works as expected on video MediaStreamTracks.</p>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src='/mediacapture-streams/permission-helper.js'></script>
+<script>
+async function createWorker(script) {
+  script = script + "self.postMessage('ready');";
+  const blob = new Blob([script], { type: 'text/javascript' });
+  const url = URL.createObjectURL(blob);
+  const worker = new Worker(url);
+  await new Promise(resolve => worker.onmessage = () => {
+      resolve();
+  });
+  URL.revokeObjectURL(url);
+  return worker;
+}
+
+promise_test(async t => {
+  const stream = await navigator.mediaDevices.getUserMedia({video: true});
+  const track = stream.getTracks()[0];
+  const worker = await createWorker(`
+    let track;
+    onmessage = async msg => {
+      if (msg.data.type === "stop") {
+        track.stop();
+        return;
+      }
+      track = msg.data.track;
+      const processor = new MediaStreamTrackProcessor({track});
+      const reader = processor.readable.getReader();
+      let readResult = await reader.read();
+      postMessage(readResult.value);
+      readResult.value.close();
+      // Continue reading until the stream is done due to a track.stop()
+      while (true) {
+        readResult = await reader.read();
+        if (readResult.done) {
+          break;
+        } else {
+          readResult.value.close();
+        }
+      }
+      await reader.closed;
+      postMessage('closed');
+    }
+  `);
+
+  worker.postMessage({ type: "start", track }, [track]);
+
+  return new Promise(resolve => {
+    worker.onmessage = t.step_func(msg => {
+      if (msg.data instanceof VideoFrame) {
+        msg.data.close();
+        worker.postMessage({ type: "stop" });
+      } else if (msg.data == 'closed') {
+        resolve();
+      } else {
+        assert_unreached();
+      }
+    })
+  });
+}, "Tests that the reader of a video MediaStreamTrackProcessor produces VideoFrame objects and is closed on track stop while running on a worker");
+
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor.worker.js b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor.worker.js
new file mode 100644
index 00000000000..000078c1d3d
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/MediaStreamTrackProcessor.worker.js
@@ -0,0 +1,47 @@
+// META: title=MediaStreamTrackProcessor tests.
+
+importScripts("/resources/testharness.js");
+
+function makeVideoFrame(timestamp) {
+  const canvas = new OffscreenCanvas(100, 100);
+  const ctx = canvas.getContext('2d');
+  return new VideoFrame(canvas, {timestamp});
+}
+
+promise_test(async t => {
+  // The generator will be used as the source for the processor to
+  // produce frames in a controlled manner.
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+  // Use a larger maxBufferSize than the default to ensure no frames
+  // will be dropped.
+  const processor = new MediaStreamTrackProcessor({track: generator.track, maxBufferSize:10});
+  const reader = processor.readable.getReader();
+  const writer = generator.writable.getWriter();
+
+  let numReads = 0;
+  let resolve = null;
+  const promise = new Promise(r => resolve = r);
+
+  const numOperations = 4;
+  // Issue reads without waiting for the frames to arrive.
+  for (let i = 0; i < numOperations; i++) {
+    reader.read().then(dv=> {
+      dv.value.close();
+      if (++numReads == numOperations)
+        resolve();
+    });
+  }
+
+  // Write video frames in different tasks to "slowly" settle the pending read
+  // requests.
+  for (let i = 0; i<numOperations; i++) {
+     await writer.write(makeVideoFrame(i));
+     await new Promise(r=>t.step_timeout(r,0));
+  }
+
+  return promise;
+
+}, "Tests that multiple read requests are eventually settled");
+
+done();
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator-with-window-tracks.https.html b/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator-with-window-tracks.https.html
new file mode 100644
index 00000000000..36fc4135e23
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator-with-window-tracks.https.html
@@ -0,0 +1,280 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>MediaStream Insertable Streams - VideoTrackGenerator</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/webrtc/RTCPeerConnection-helper.js"></script>
+</head>
+<body>
+  <h1 class="instructions">Description</h1>
+  <p class="instructions">This test checks that generating video MediaStreamTracks from VideoTrackGenerator works as expected.</p>
+  <script id="scriptRoutines">
+    const pixelColour = [50, 100, 150, 255];
+    const height = 240;
+    const width = 320;
+    function makeVideoFrame(timestamp) {
+      const canvas = new OffscreenCanvas(width, height);
+
+      const ctx = canvas.getContext('2d', {alpha: false});
+      ctx.fillStyle = `rgba(${pixelColour.join()})`;
+      ctx.fillRect(0, 0, width, height);
+
+      return new VideoFrame(canvas, {timestamp, alpha: 'discard'});
+    }
+
+    async function getVideoFrame() {
+      const stream = await getNoiseStream({video: true});
+      const input_track = stream.getTracks()[0];
+      const processor = new MediaStreamTrackProcessor(input_track);
+      const reader = processor.readable.getReader();
+      const result = await reader.read();
+      input_track.stop();
+      return result.value;
+    }
+
+    function assertPixel(t, bytes, expected, epsilon = 5) {
+      for (let i = 0; i < bytes.length; i++) {
+        t.step(() => {
+          assert_less_than(Math.abs(bytes[i] - expected[i]),  epsilon, "Mismatched pixel");
+        });
+      }
+    }
+
+    async function initiateSingleTrackCall(t, track, output) {
+      const caller = new RTCPeerConnection();
+      t.add_cleanup(() => caller.close());
+      const callee = new RTCPeerConnection();
+      t.add_cleanup(() => callee.close());
+      caller.addTrack(track);
+      t.add_cleanup(() => track.stop());
+
+      exchangeIceCandidates(caller, callee);
+      // Wait for the first track.
+      const e = await exchangeOfferAndListenToOntrack(t, caller, callee);
+      output.srcObject = new MediaStream([e.track]);
+      // Exchange answer.
+      await exchangeAnswer(caller, callee);
+      await waitForConnectionStateChange(callee, ['connected']);
+    }
+  </script>
+  <script>
+    async function createWorker(script) {
+      script = scriptRoutines.text + script + "self.postMessage('ready');";
+      const blob = new Blob([script], { type: 'text/javascript' });
+      const url = URL.createObjectURL(blob);
+      const worker = new Worker(url);
+      await new Promise(resolve => worker.onmessage = () => {
+          resolve();
+      });
+      URL.revokeObjectURL(url);
+      return worker;
+    }
+
+   promise_test(async t => {
+     const worker = await createWorker(`
+         const generator = new VideoTrackGenerator();
+         const videoFrame = makeVideoFrame(1);
+         const originalWidth = videoFrame.displayWidth;
+         const originalHeight = videoFrame.displayHeight;
+         self.onmessage = async (event) => {
+           if (event.data == "transfer") {
+             self.postMessage({ track: generator.track, originalWidth, originalHeight }, [generator.track]);
+             return;
+           }
+           if (event.data == "write frame") {
+             generator.writable.getWriter().write(videoFrame)
+             return;
+           }
+           if (event.data == "cleanup") {
+             videoFrame.close();
+             return;
+           }
+         }
+     `);
+
+     t.add_cleanup(() => worker.postMessage("cleanup"));
+
+     worker.postMessage("transfer");
+     const { track, originalWidth, originalHeight } = await new Promise(resolve => worker.onmessage = e => resolve(e.data));
+     t.add_cleanup(() => track.stop());
+
+     const video = document.createElement("video");
+     video.autoplay = true;
+     video.width = 320;
+     video.height = 240;
+     video.srcObject = new MediaStream([track]);
+     video.play();
+
+     // Wait for the video element to be connected to the generator and
+     // generate the frame.
+     video.onloadstart = () => worker.postMessage("write frame");
+
+     return new Promise((resolve)=> {
+       video.ontimeupdate = t.step_func(() => {
+         const canvas = document.createElement("canvas");
+         canvas.width = originalWidth;
+         canvas.height = originalHeight;
+         const context = canvas.getContext('2d');
+         context.drawImage(video, 0, 0);
+         // Pick a pixel in the centre of the video and check that it has the colour of the frame provided.
+         const pixel = context.getImageData(originalWidth/2, originalHeight/2, 1, 1);
+         assertPixel(t, pixel.data, pixelColour);
+         resolve();
+       });
+     });
+   }, 'Tests that frames are actually rendered correctly in a stream used for a video element.');
+
+   promise_test(async t => {
+     const worker = await createWorker(`
+         const generator = new VideoTrackGenerator();
+         const videoFrame = makeVideoFrame(1);
+         const originalWidth = videoFrame.displayWidth;
+         const originalHeight = videoFrame.displayHeight;
+         let intervalId;
+         self.onmessage = async (event) => {
+           if (event.data == "transfer") {
+             self.postMessage({ track: generator.track}, [generator.track]);
+             // Write frames for the duration of the test.
+             const writer = generator.writable.getWriter();
+             let timestamp = 0;
+             intervalId = setInterval(async () => {
+               timestamp++;
+               await writer.write(makeVideoFrame(timestamp));
+             }, 40);
+             return;
+           }
+         }
+     `);
+
+     worker.postMessage("transfer");
+     const { track } = await new Promise(resolve => worker.onmessage = e => resolve(e.data));
+     t.add_cleanup(() => track.stop());
+
+     const video = document.createElement('video');
+     video.autoplay = true;
+     video.width = width;
+     video.height = height;
+     video.muted = true;
+
+     await initiateSingleTrackCall(t, track, video);
+     return new Promise(resolve => {
+       video.requestVideoFrameCallback(t.step_func(() => {
+         const canvas = document.createElement('canvas');
+         canvas.width = width;
+         canvas.height = height;
+         const context = canvas.getContext('2d');
+         context.drawImage(video, 0, 0);
+         // Pick a pixel in the centre of the video and check that it has the
+         // colour of the frame provided.
+         const pixel = context.getImageData(width / 2, height / 2, 1, 1);
+         // Encoding/decoding can add noise, so increase the threshhold to 8.
+         assertPixel(t, pixel.data, pixelColour, 8);
+         resolve();
+       }));
+     });
+   }, 'Tests that frames are actually rendered correctly in a stream sent over a peer connection.');
+
+    promise_test(async t => {
+      const colorUL = [255, 0, 0, 255];
+      const colorUR = [255, 255, 0, 255];
+      const colorLL = [0, 255, 0, 255];
+      const colorLR = [0, 255, 255, 255];
+      const worker = await createWorker(`
+          const generator = new VideoTrackGenerator();
+          const videoFrame = makeVideoFrame(1);
+          const originalWidth = videoFrame.displayWidth;
+          const originalHeight = videoFrame.displayHeight;
+          let intervalId;
+          self.onmessage = async (event) => {
+            if (event.data == "transfer") {
+              self.postMessage({ track: generator.track}, [generator.track]);
+              const inputCanvas = new OffscreenCanvas(width, height);
+              const inputContext = inputCanvas.getContext('2d', {alpha: false});
+              // draw four quadrants
+              inputContext.fillStyle = \`rgba(${colorUL.join()})\`;
+              inputContext.fillRect(0, 0, width / 2, height / 2);
+              inputContext.fillStyle = \`rgba(${colorUR.join()})\`;
+              inputContext.fillRect(width / 2, 0, width / 2, height / 2);
+              inputContext.fillStyle = \`rgba(${colorLL.join()})\`;
+              inputContext.fillRect(0, height / 2, width / 2, height / 2);
+              inputContext.fillStyle = \`rgba(${colorLR.join()})\`;
+              inputContext.fillRect(width / 2, height / 2, width / 2, height / 2);
+
+              // Write frames for the duration of the test.
+              const writer = generator.writable.getWriter();
+              let timestamp = 0;
+              const intervalId = setInterval(async () => {
+                timestamp++;
+                await writer.write(new VideoFrame(inputCanvas, {timestamp: timestamp, alpha: 'discard'}));
+              }, 40);
+              return;
+            }
+            if (event.data.type === "getVideoFrame") {
+              const processor = new MediaStreamTrackProcessor({ track: event.data.track });
+              const reader = processor.readable.getReader();
+              const frame = (await reader.read()).value;
+              self.postMessage({frame}, [frame])
+              event.data.track.stop();
+            }
+          }
+      `);
+
+      worker.postMessage("transfer");
+      const { track } = await new Promise(resolve => worker.onmessage = e => resolve(e.data));
+      t.add_cleanup(() => track.stop());
+
+      const caller = new RTCPeerConnection();
+      t.add_cleanup(() => caller.close());
+      const callee = new RTCPeerConnection();
+      t.add_cleanup(() => callee.close());
+      const sender = caller.addTrack(track);
+
+      exchangeIceCandidates(caller, callee);
+      // Wait for the first track.
+      const e = await exchangeOfferAndListenToOntrack(t, caller, callee);
+
+      // Exchange answer.
+      await exchangeAnswer(caller, callee);
+      await waitForConnectionStateChange(callee, ['connected']);
+      const params = sender.getParameters();
+      params.encodings.forEach(e => e.scaleResolutionDownBy = 2);
+      sender.setParameters(params);
+
+      // The first frame may not have had scaleResolutionDownBy applied
+      const numTries = 5;
+      for (let i = 1; i <= numTries; i++) {
+        worker.postMessage({type:"getVideoFrame", track: e.track}, [e.track]);
+        const {frame: outputFrame} = await new Promise(resolve => worker.onmessage = e => resolve(e.data));
+        if (outputFrame.displayWidth !== width / 2) {
+          assert_less_than(i, numTries, `First ${numTries} frames were the wrong size.`);
+          outputFrame.close();
+          continue;
+        }
+
+        assert_equals(outputFrame.displayWidth, width / 2);
+        assert_equals(outputFrame.displayHeight, height / 2);
+
+        const outputCanvas = new OffscreenCanvas(width / 2, height / 2);
+        const outputContext = outputCanvas.getContext('2d', {alpha: false});
+        outputContext.drawImage(outputFrame, 0, 0);
+        outputFrame.close();
+        // Check the four quadrants
+        const pixelUL = outputContext.getImageData(width / 8, height / 8, 1, 1);
+        assertPixel(t, pixelUL.data, colorUL);
+        const pixelUR =
+            outputContext.getImageData(width * 3 / 8, height / 8, 1, 1);
+        assertPixel(t, pixelUR.data, colorUR);
+        const pixelLL =
+            outputContext.getImageData(width / 8, height * 3 / 8, 1, 1);
+        assertPixel(t, pixelLL.data, colorLL);
+        const pixelLR =
+            outputContext.getImageData(width * 3 / 8, height * 3 / 8, 1, 1);
+        assertPixel(t, pixelLR.data, colorLR);
+        break;
+      }
+    }, 'Tests that frames are sent correctly with RTCRtpEncodingParameters.scaleResolutionDownBy.');
+
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator.worker.js b/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator.worker.js
new file mode 100644
index 00000000000..37caf1a37f2
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/VideoTrackGenerator.worker.js
@@ -0,0 +1,233 @@
+// META: title=VideoTrackGenerator tests.
+
+importScripts("/resources/testharness.js");
+
+function make_audio_data(timestamp, channels, sampleRate, frames) {
+  let data = new Float32Array(frames*channels);
+
+  // This generates samples in a planar format.
+  for (var channel = 0; channel < channels; channel++) {
+    let hz = 100 + channel * 50; // sound frequency
+    let base_index = channel * frames;
+    for (var i = 0; i < frames; i++) {
+      let t = (i / sampleRate) * hz * (Math.PI * 2);
+      data[base_index + i] = Math.sin(t);
+    }
+  }
+
+  return new AudioData({
+    timestamp: timestamp,
+    data: data,
+    numberOfChannels: channels,
+    numberOfFrames: frames,
+    sampleRate: sampleRate,
+    format: "f32-planar",
+  });
+}
+
+const pixelColour = [50, 100, 150, 255];
+const height = 240;
+const width = 320;
+function makeVideoFrame(timestamp) {
+  const canvas = new OffscreenCanvas(width, height);
+
+  const ctx = canvas.getContext('2d', {alpha: false});
+  ctx.fillStyle = `rgba(${pixelColour.join()})`;
+  ctx.fillRect(0, 0, width, height);
+
+  return new VideoFrame(canvas, {timestamp, alpha: 'discard'});
+}
+
+promise_test(async t => {
+  const videoFrame = makeVideoFrame(1);
+  const originalWidth = videoFrame.displayWidth;
+  const originalHeight = videoFrame.displayHeight;
+  const originalTimestamp = videoFrame.timestamp;
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  // Use a MediaStreamTrackProcessor as a sink for |generator| to verify
+  // that |processor| actually forwards the frames written to its writable
+  // field.
+  const processor = new MediaStreamTrackProcessor(generator);
+  const reader = processor.readable.getReader();
+  const readerPromise = new Promise(async resolve => {
+    const result = await reader.read();
+    t.add_cleanup(() => result.value.close());
+    t.step_func(() => {
+      assert_equals(result.value.displayWidth, originalWidth);
+      assert_equals(result.value.displayHeight, originalHeight);
+      assert_equals(result.value.timestamp, originalTimestamp);
+    })();
+    resolve();
+  });
+
+  generator.writable.getWriter().write(videoFrame);
+  return readerPromise;
+}, 'Tests that VideoTrackGenerator forwards frames to sink');
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  const writer = generator.writable.getWriter();
+  const frame = makeVideoFrame(1);
+  await writer.write(frame);
+
+  assert_equals(generator.track.kind, "video");
+  assert_equals(generator.track.readyState, "live");
+}, "Tests that creating a VideoTrackGenerator works as expected");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  const writer = generator.writable.getWriter();
+  const frame = makeVideoFrame(1);
+  await writer.write(frame);
+
+  assert_throws_dom("InvalidStateError", () => frame.clone(), "VideoFrame wasn't destroyed on write.");
+}, "Tests that VideoFrames are destroyed on write");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  const writer = generator.writable.getWriter();
+
+  if (!self.AudioData)
+    return;
+
+  const defaultInit = {
+      timestamp: 1234,
+      channels: 2,
+      sampleRate: 8000,
+      frames: 100,
+  };
+  const audioData = make_audio_data(defaultInit.timestamp, defaultInit.channels, defaultInit.sampleRate,
+      defaultInit.frames);
+
+  await promise_rejects_js(t, TypeError, writer.write("test"));
+}, "Generator writer rejects on mismatched media input");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  const writer = generator.writable.getWriter();
+  await promise_rejects_js(t, TypeError, writer.write("potatoe"));
+}, "Generator writer rejects on non media input");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+
+  const writer = generator.writable.getWriter();
+  const frame1 = makeVideoFrame(1);
+  t.add_cleanup(() => frame1.close());
+  await writer.write(frame1);
+  assert_equals(frame1.codedWidth, 0);
+
+  generator.track.stop();
+
+  await writer.closed;
+
+  const frame2 = makeVideoFrame(1);
+  t.add_cleanup(() => frame2.close());
+  await promise_rejects_js(t, TypeError, writer.write(frame2));
+
+  assert_equals(frame2.codedWidth, 320);
+}, "A writer rejects when generator's track is stopped");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  generator.muted = true;
+
+  const writer = generator.writable.getWriter();
+  const frame1 = makeVideoFrame(1);
+  t.add_cleanup(() => frame1.close());
+  await writer.write(frame1);
+  assert_equals(frame1.codedWidth, 0);
+
+  generator.track.stop();
+
+  await writer.closed;
+
+  const frame2 = makeVideoFrame(1);
+  t.add_cleanup(() => frame2.close());
+  await promise_rejects_js(t, TypeError, writer.write(frame2));
+
+  assert_equals(frame2.codedWidth, 320);
+}, "A muted writer rejects when generator's track is stopped");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+
+  const writer = generator.writable.getWriter();
+  const frame1 = makeVideoFrame(1);
+  t.add_cleanup(() => frame1.close());
+  await writer.write(frame1);
+  assert_equals(frame1.codedWidth, 0);
+
+  const clonedTrack = generator.track.clone();
+  generator.track.stop();
+
+  await new Promise(resolve => t.step_timeout(resolve, 100));
+
+  const frame2 = makeVideoFrame(1);
+  t.add_cleanup(() => frame2.close());
+  await writer.write(frame2);
+  assert_equals(frame2.codedWidth, 0);
+
+  clonedTrack.stop();
+
+  await writer.closed;
+
+  const frame3 = makeVideoFrame(1);
+  t.add_cleanup(() => frame3.close());
+  await promise_rejects_js(t, TypeError, writer.write(frame3));
+
+  assert_equals(frame3.codedWidth, 320);
+}, "A writer rejects when generator's track and clones are stopped");
+
+promise_test(async t => {
+  const generator = new VideoTrackGenerator();
+  t.add_cleanup(() => generator.track.stop());
+
+  // Use a MediaStreamTrackProcessor as a sink for |generator| to verify
+  // that |processor| actually forwards the frames written to its writable
+  // field.
+  const processor = new MediaStreamTrackProcessor(generator);
+  const reader = processor.readable.getReader();
+  const videoFrame = makeVideoFrame(1);
+
+  const writer = generator.writable.getWriter();
+  const videoFrame1 = makeVideoFrame(1);
+  writer.write(videoFrame1);
+  const result1 = await reader.read();
+  t.add_cleanup(() => result1.value.close());
+  assert_equals(result1.value.timestamp, 1);
+  generator.muted = true;
+
+  // This frame is expected to be discarded.
+  const videoFrame2 = makeVideoFrame(2);
+  writer.write(videoFrame2);
+  generator.muted = false;
+
+  const videoFrame3 = makeVideoFrame(3);
+  writer.write(videoFrame3);
+  const result3 = await reader.read();
+  t.add_cleanup(() => result3.value.close());
+  assert_equals(result3.value.timestamp, 3);
+
+  // Set up a read ahead of time, then mute, enqueue and unmute.
+  const promise5 = reader.read();
+  generator.muted = true;
+  writer.write(makeVideoFrame(4)); // Expected to be discarded.
+  generator.muted = false;
+  writer.write(makeVideoFrame(5));
+  const result5 = await promise5;
+  t.add_cleanup(() => result5.value.close());
+  assert_equals(result5.value.timestamp, 5);
+}, 'Tests that VideoTrackGenerator forwards frames only when unmuted');
+
+done();
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-audio.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-audio.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-audio.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-audio.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-service-worker.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-service-worker.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-service-worker.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-service-worker.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-shared-worker.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-shared-worker.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-shared-worker.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-shared-worker.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-worker.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-worker.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-in-worker.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-in-worker.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-pipes-data-in-worker.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-pipes-data-in-worker.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-pipes-data-in-worker.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-pipes-data-in-worker.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-video.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-video.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackGenerator-video.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackGenerator-video.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackProcessor-backpressure.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-backpressure.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackProcessor-backpressure.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-backpressure.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackProcessor-video.https.html b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-video.https.html
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/MediaStreamTrackProcessor-video.https.html
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-video.https.html
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-worker.js b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-worker.js
new file mode 100644
index 00000000000..51eaef80a90
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-insertable-streams/legacy/MediaStreamTrackProcessor-worker.js
@@ -0,0 +1,17 @@
+onmessage = async msg => {
+  const reader = msg.data.readable.getReader();
+  let readResult = await reader.read();
+  postMessage(readResult.value);
+  readResult.value.close();
+  // Continue reading until the stream is done due to a track.stop()
+  while (true) {
+    readResult = await reader.read();
+    if (readResult.done) {
+      break;
+    } else {
+      readResult.value.close();
+    }
+  }
+  await reader.closed;
+  postMessage('closed');
+}
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/dedicated-worker.js b/tests/wpt/tests/mediacapture-insertable-streams/legacy/dedicated-worker.js
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/dedicated-worker.js
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/dedicated-worker.js
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/service-worker.js b/tests/wpt/tests/mediacapture-insertable-streams/legacy/service-worker.js
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/service-worker.js
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/service-worker.js
diff --git a/tests/wpt/tests/mediacapture-insertable-streams/tentative/shared-worker.js b/tests/wpt/tests/mediacapture-insertable-streams/legacy/shared-worker.js
similarity index 100%
rename from tests/wpt/tests/mediacapture-insertable-streams/tentative/shared-worker.js
rename to tests/wpt/tests/mediacapture-insertable-streams/legacy/shared-worker.js
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-canvas-media-source.https.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-canvas-media-source.https.html
index 187015f42e6..e640714d5cf 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-canvas-media-source.https.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-canvas-media-source.https.html
@@ -4,6 +4,11 @@
 
 <head>
   <title>MediaRecorder canvas media source</title>
+  <meta name=variant content="?mimeType=''">
+  <meta name=variant content="?mimeType=video/webm;codecs=vp8,opus">
+  <meta name=variant content="?mimeType=video/webm;codecs=vp9,opus">
+  <meta name=variant content="?mimeType=video/webm;codecs=av1,opus">
+  <meta name=variant content="?mimeType=video/mp4;codecs=avc1,mp4a.40.2">
   <link rel="help"
         href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#dom-mediarecorder-mimeType">
   <script src="/resources/testharness.js"></script>
@@ -21,6 +26,8 @@ async_test(test => {
   const CANVAS_WIDTH = 256;
   const CANVAS_HEIGHT = 144;
 
+  let large_size_data_available = false;
+
   // Empty video frames from this resolution consistently have ~750 bytes in my
   // tests, while valid video frames usually contain 7-8KB. A threshold of
   // 1.5KB consistently fails when video frames are empty but passes when video
@@ -53,10 +60,9 @@ async_test(test => {
     return { startCamera, stopCamera };
   }
 
-  function useMediaRecorder(stream, frameSizeCallback) {
+  function useMediaRecorder(stream, mimeType, frameSizeCallback) {
     const mediaRecorder = new MediaRecorder(
-      stream,
-      {}
+      stream, { mimeType }
     );
 
     mediaRecorder.ondataavailable = event => {
@@ -68,9 +74,21 @@ async_test(test => {
       }
     };
 
+    mediaRecorder.onstop = event => {
+      assert_equals(large_size_data_available, true),
+          "onstop is called after valid data is available";
+    };
+
     mediaRecorder.start(1000);
   }
 
+  const params = new URLSearchParams(window.location.search);
+  const mimeType = params.get('mimeType');
+  if (mimeType) {
+    assert_implements_optional(MediaRecorder.isTypeSupported(mimeType),
+      `"${mimeType}" for MediaRecorder is not supported`);
+  }
+
   const canvas = document.querySelector("canvas");
   const ctx = canvas.getContext("2d", {
     alpha: false,
@@ -115,9 +133,12 @@ async_test(test => {
 
     const compositedMediaStream = new MediaStream([composedTrackGenerator]);
 
-    useMediaRecorder(compositedMediaStream, test.step_func_done(size => {
-      assert_greater_than(size, THRESHOLD_FOR_EMPTY_FRAMES);
-      stopCamera();
+    useMediaRecorder(compositedMediaStream, mimeType, (size => {
+      if (size > THRESHOLD_FOR_EMPTY_FRAMES) {
+        large_size_data_available = true;
+        stopCamera();
+        test.done();
+      }
     }));
   });
 }, "MediaRecorder returns frames containing video content");
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-events-and-exceptions.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-events-and-exceptions.html
index 0a377991ba0..409e46c91da 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-events-and-exceptions.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-events-and-exceptions.html
@@ -2,6 +2,12 @@
 <html>
 <head>
     <title>MediaRecorder events and exceptions</title>
+    <meta name=timeout content=long>
+    <meta name=variant content="?mimeType=''">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp8,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp9,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=av1,opus">
+    <meta name=variant content="?mimeType=video/mp4;codecs=avc1,mp4a.40.2">
     <link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#mediarecorder">
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
@@ -72,7 +78,15 @@
                           new MediaStream(), {mimeType : "video/invalid"});
                       },
                       "recorder should throw() with unsupported mimeType");
-    const recorder = new MediaRecorder(new MediaStream());
+
+    const params = new URLSearchParams(window.location.search);
+    const mimeType = params.get('mimeType');
+    if (mimeType) {
+      assert_implements_optional(MediaRecorder.isTypeSupported(mimeType),
+        `"${mimeType}" for MediaRecorder is not supported`);
+    }
+
+    const recorder = new MediaRecorder(new MediaStream(), { mimeType });
     assert_equals(recorder.state, "inactive");
 
     recorder.stop();
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-mimetype.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-mimetype.html
index 994792790a2..30df91c9587 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-mimetype.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-mimetype.html
@@ -20,6 +20,7 @@ const AUDIO_CODECS_MIME_TYPES = [
   'audio/ogg; codecs="opus"',
   'audio/webm; codecs="vorbis"',
   'audio/webm; codecs="opus"',
+  'aduio/mp4: codecs="mp4a.40.2"',
 ];
 
 const VIDEO_ONLY_MIME_TYPES = [
@@ -31,6 +32,7 @@ const VIDEO_CODECS_MIME_TYPES = [
   'video/webm; codecs="vp8"',
   'video/webm; codecs="vp9"',
   'video/webm; codecs="av1"',
+  'video/mp4: codecs="avc1"',
 ];
 
 const AUDIO_VIDEO_MIME_TYPES = [
@@ -39,6 +41,7 @@ const AUDIO_VIDEO_MIME_TYPES = [
   'video/webm; codecs="vp9, vorbis"',
   'video/webm; codecs="vp9, opus"',
   'video/webm; codecs="av1, opus"',
+  'video/mp4: codecs="avc1, mp4a.40.2"',
 ];
 
 const AUDIO_MIME_TYPES = [
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-pause-resume.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-pause-resume.html
index 84efe52e06b..8dc231279a0 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-pause-resume.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-pause-resume.html
@@ -2,6 +2,12 @@
 <html>
 <head>
     <title>MediaRecorder Pause and Resume</title>
+    <meta name=timeout content=long>
+    <meta name=variant content="?mimeType=''">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp8,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp9,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=av1,opus">
+    <meta name=variant content="?mimeType=video/mp4;codecs=avc1,mp4a.40.2">
     <link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#mediarecorder">
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
@@ -17,74 +23,93 @@
         return arr;
     }
 
+    const params = new URLSearchParams(window.location.search);
+    const mimeType = params.get('mimeType');
+    const tag = `mimeType "${mimeType}"`;
     promise_test(async t => {
-        const {stream: video, control} = createVideoStream(t);
-        control.addVideoFrame();
-        const recorder = new MediaRecorder(video);
-        const events = recordEvents(recorder,
-            ["start", "stop", "dataavailable", "pause", "resume", "error"]);
+      const {stream: video, control} = createVideoStream(t);
+      control.addVideoFrame();
+      if (mimeType && !MediaRecorder.isTypeSupported(mimeType)) {
+          promise_test(async t => {
+              assert_throws_dom('NotSupportedError',
+                              () => new MediaRecorder(video, { mimeType }));
+          }, `MediaRecorder constructor throws on no support 1st, ${mimeType}`);
+          return;
+      }
 
-        recorder.start();
-        assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
-        await new Promise(r => recorder.onstart = r);
+      const recorder = new MediaRecorder(video, {mimeType});
+      const events = recordEvents(recorder,
+          ["start", "stop", "dataavailable", "pause", "resume", "error"]);
 
-        recorder.pause();
-        assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
+      recorder.start();
+      assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
+      await new Promise(r => recorder.onstart = r);
 
-        // A second call to pause should be idempotent
-        recorder.pause();
-        assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
+      recorder.pause();
+      assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
 
-        let event = await new Promise(r => recorder.onpause = r);
-        assert_equals(event.type, "pause", "the event type should be pause");
-        assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
+      // A second call to pause should be idempotent
+      recorder.pause();
+      assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
 
-        recorder.resume();
-        assert_equals(recorder.state, "recording", "MediaRecorder state should be recording immediately following resume() call");
+      let event = await new Promise(r => recorder.onpause = r);
+      assert_equals(event.type, "pause", "the event type should be pause");
+      assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
 
-        // A second call to resume should be idempotent
-        recorder.resume();
-        assert_equals(recorder.state, "recording", "MediaRecorder state should be recording immediately following resume() call");
+      recorder.resume();
+      assert_equals(recorder.state, "recording", "MediaRecorder state should be recording immediately following resume() call");
 
-        event = await new Promise(r => recorder.onresume = r);
-        assert_equals(event.type, "resume", "the event type should be resume");
-        assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
+      // A second call to resume should be idempotent
+      recorder.resume();
+      assert_equals(recorder.state, "recording", "MediaRecorder state should be recording immediately following resume() call");
 
-        recorder.stop();
-        await new Promise(r => recorder.onstop = r);
+      event = await new Promise(r => recorder.onresume = r);
+      assert_equals(event.type, "resume", "the event type should be resume");
+      assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
 
-        assert_array_equals(events, ["start", "pause", "resume", "dataavailable", "stop"],
-            "Should have gotten expected events");
-    }, "MediaRecorder handles pause() and resume() calls appropriately in state and events");
+      recorder.stop();
+      await new Promise(r => recorder.onstop = r);
+
+      assert_array_equals(events, ["start", "pause", "resume", "dataavailable", "stop"],
+          "Should have gotten expected events");
+    }, `MediaRecorder handles pause() and resume() state and events, ${tag}`);
 
     promise_test(async t => {
-        const {stream: video, control} = createVideoStream(t);
-        control.addVideoFrame();
-        const recorder = new MediaRecorder(video);
-        const events = recordEvents(recorder,
-            ["start", "stop", "dataavailable", "pause", "resume", "error"]);
+      const {stream: video, control} = createVideoStream(t);
+      control.addVideoFrame();
+      if (mimeType && !MediaRecorder.isTypeSupported(mimeType)) {
+          promise_test(async t => {
+              assert_throws_dom('NotSupportedError',
+                              () => new MediaRecorder(video, { mimeType }));
+          }, `MediaRecorder constructor throws on no support 2nd, ${mimeType}`);
+          return;
+      }
+      const recorder = new MediaRecorder(video, {mimeType});
+      const events = recordEvents(recorder,
+          ["start", "stop", "dataavailable", "pause", "resume", "error"]);
 
-        recorder.start();
-        assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
-        await new Promise(r => recorder.onstart = r);
+      recorder.start();
+      assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
+      await new Promise(r => recorder.onstart = r);
 
-        recorder.pause();
-        assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
-        let event = await new Promise(r => recorder.onpause = r);
-        assert_equals(event.type, "pause", "the event type should be pause");
-        assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
+      recorder.pause();
+      assert_equals(recorder.state, "paused", "MediaRecorder should be paused immediately following pause()");
+      let event = await new Promise(r => recorder.onpause = r);
+      assert_equals(event.type, "pause", "the event type should be pause");
+      assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
 
-        recorder.stop();
-        assert_equals(recorder.state, "inactive", "MediaRecorder should be inactive after being stopped");
-        await new Promise(r => recorder.onstop = r);
+      recorder.stop();
+      assert_equals(recorder.state, "inactive", "MediaRecorder should be inactive after being stopped");
+      await new Promise(r => recorder.onstop = r);
 
-        recorder.start();
-        assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
-        await new Promise(r => recorder.onstart = r);
+      recorder.start();
+      assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
+      await new Promise(r => recorder.onstart = r);
+
+      assert_array_equals(events, ["start", "pause", "dataavailable", "stop", "start"],
+          "Should have gotten expected events");
+    }, `MediaRecorder handles stop() in paused state appropriately, ${tag}`);
 
-        assert_array_equals(events, ["start", "pause", "dataavailable", "stop", "start"],
-            "Should have gotten expected events");
-    }, "MediaRecorder handles stop() in paused state appropriately");
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-start.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-start.html
index ef2fe69719e..4e3c252e8d1 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-start.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-start.html
@@ -16,7 +16,7 @@
     }
 
     test(t => {
-        const mimeType = [ 'audio/aac', 'audio/ogg', 'audio/webm' ].find(MediaRecorder.isTypeSupported);
+        const mimeType = [ 'audio/aac', 'audio/ogg', 'audio/webm', 'audio/mp4' ].find(MediaRecorder.isTypeSupported);
         const mediaRecorder = new MediaRecorder(createVideoStream(), {mimeType});
         assert_throws_dom("NotSupportedError", () => mediaRecorder.start());
     }, "MediaRecorder cannot record the stream using the current configuration");
diff --git a/tests/wpt/tests/mediacapture-record/MediaRecorder-stop.html b/tests/wpt/tests/mediacapture-record/MediaRecorder-stop.html
index 2b49a4cb6c4..d6ce3707720 100644
--- a/tests/wpt/tests/mediacapture-record/MediaRecorder-stop.html
+++ b/tests/wpt/tests/mediacapture-record/MediaRecorder-stop.html
@@ -2,6 +2,11 @@
 <html>
 <head>
     <title>MediaRecorder Stop</title>
+    <meta name=variant content="?mimeType=''">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp8,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=vp9,opus">
+    <meta name=variant content="?mimeType=video/webm;codecs=av1,opus">
+    <meta name=variant content="?mimeType=video/mp4;codecs=avc1,mp4a.40.2">
     <link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#mediarecorder">
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
@@ -33,9 +38,21 @@
       return true;
     }
 
+    function doneWithUnsupportedType(mimeType) {
+      if (mimeType) {
+        assert_implements_optional(MediaRecorder.isTypeSupported(mimeType),
+          `"${mimeType}" for MediaRecorder is not supported`);
+      }
+    }
+
+    const params = new URLSearchParams(window.location.search);
+    const mimeType = params.get('mimeType');
+    const tag = `mimeType "${mimeType}"`;
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream: video} = createVideoStream(t);
-        const recorder = new MediaRecorder(video);
+        const recorder = new MediaRecorder(video, {mimeType});
         const events = recordEvents(recorder,
             ["start", "stop", "dataavailable", "pause", "resume", "error"]);
         assert_equals(video.getVideoTracks().length, 1, "video mediastream starts with one track");
@@ -56,8 +73,10 @@
     }, "MediaRecorder will stop recording and fire a stop event when all tracks are ended");
 
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream: video} = createVideoStream(t);
-        const recorder = new MediaRecorder(video);
+        const recorder = new MediaRecorder(video, {mimeType});
         const events = recordEvents(recorder,
             ["start", "stop", "dataavailable", "pause", "resume", "error"]);
         recorder.start();
@@ -77,7 +96,9 @@
     }, "MediaRecorder will stop recording and fire a stop event when stop() is called");
 
     promise_test(async t => {
-        const recorder = new MediaRecorder(createVideoStream(t).stream);
+        doneWithUnsupportedType(mimeType);
+
+        const recorder = new MediaRecorder(createVideoStream(t).stream, {mimeType});
         recorder.stop();
         await Promise.race([
             new Promise((_, reject) => recorder.onstop =
@@ -86,7 +107,9 @@
     }, "MediaRecorder will not fire an exception when stopped after creation");
 
     promise_test(async t => {
-        const recorder = new MediaRecorder(createVideoStream(t).stream);
+        doneWithUnsupportedType(mimeType);
+
+        const recorder = new MediaRecorder(createVideoStream(t).stream, {mimeType});
         recorder.start();
         recorder.stop();
         const event = await new Promise(r => recorder.onstop = r);
@@ -98,8 +121,10 @@
     }, "MediaRecorder will not fire an exception when stopped after having just been stopped");
 
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream} = createVideoStream(t);
-        const recorder = new MediaRecorder(stream);
+        const recorder = new MediaRecorder(stream, {mimeType});
         recorder.start();
         stream.getVideoTracks()[0].stop();
         const event = await new Promise(r => recorder.onstop = r);
@@ -111,8 +136,10 @@
     }, "MediaRecorder will not fire an exception when stopped after having just been spontaneously stopped");
 
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream} = createAudioVideoStream(t);
-        const recorder = new MediaRecorder(stream);
+        const recorder = new MediaRecorder(stream, {mimeType});
         const events = [];
         const startPromise = new Promise(resolve => recorder.onstart = resolve);
         const stopPromise = new Promise(resolve => recorder.onstop = resolve);
@@ -128,8 +155,10 @@
     }, "MediaRecorder will fire start event even if stopped synchronously");
 
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream} = createAudioVideoStream(t);
-        const recorder = new MediaRecorder(stream);
+        const recorder = new MediaRecorder(stream, {mimeType});
         const events = [];
         const startPromise = new Promise(resolve => recorder.onstart = resolve);
         const stopPromise = new Promise(resolve => recorder.onstop = resolve);
@@ -149,8 +178,10 @@
     }, "MediaRecorder will fire start event even if a track is removed synchronously");
 
     promise_test(async t => {
+        doneWithUnsupportedType(mimeType);
+
         const {stream} = createFlowingAudioVideoStream(t);
-        const recorder = new MediaRecorder(stream);
+        const recorder = new MediaRecorder(stream, {mimeType});
         const events = recordEvents(recorder,
             ["start", "stop", "dataavailable", "pause", "resume", "error"]);
         const dataPromise = new Promise(r => recorder.ondataavailable = r);
diff --git a/tests/wpt/tests/pointerevents/pointerevent_attributes.html b/tests/wpt/tests/pointerevents/pointerevent_attributes.html
index 7675dd5afda..13fb30f61e9 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_attributes.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_attributes.html
@@ -8,6 +8,11 @@
   <meta name="variant" content="?mouse-right">
   <meta name="variant" content="?pen-right">
   <meta name="variant" content="?touch">
+  <meta name="variant" content="?mouse-nonstandard">
+  <meta name="variant" content="?pen-nonstandard">
+  <meta name="variant" content="?mouse-right-nonstandard">
+  <meta name="variant" content="?pen-right-nonstandard">
+  <meta name="variant" content="?touch-nonstandard">
   <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
   <style>
     html {
@@ -83,7 +88,8 @@ const frameLoadedPromise = new Promise(resolve => {
 
     const queryStringFragments = location.search.substring(1).split('-');
     const pointerType = queryStringFragments[0];
-    const button = queryStringFragments[1];
+    const button = queryStringFragments[1] === "right" ? "right" : undefined;
+    const standard = !(queryStringFragments[queryStringFragments.length - 1] === "nonstandard");
 
     const eventList = [
       'pointerover',
@@ -218,7 +224,7 @@ const frameLoadedPromise = new Promise(resolve => {
        verifyButtonAttributes(event);
        verifyPosition(event);
        assert_true(event.isPrimary, 'isPrimary attribute is true');
-       check_PointerEvent(event, testNamePrefix);
+       check_PointerEvent(event, testNamePrefix, standard);
     }
 
     function pointerPromise(test, testNamePrefix, type, target) {
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointer_boundary_events_after_removing_last_over_element.html b/tests/wpt/tests/pointerevents/pointerevent_pointer_boundary_events_after_removing_last_over_element.html
new file mode 100644
index 00000000000..bf2a405f727
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointer_boundary_events_after_removing_last_over_element.html
@@ -0,0 +1,149 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Redundant "pointerenter" shouldn't be fired without "pointerleave"s</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-actions.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script>
+"use strict";
+
+function stringifyEvents(eventArray) {
+  if (!eventArray.length) {
+    return "[]";
+  }
+  let result = "";
+  eventArray.forEach(event => {
+    if (result != "") {
+      result += ", ";
+    }
+    result += `${event.type}@${
+      event.target?.nodeType == Node.ELEMENT_NODE
+        ? `${event.target.localName}${
+            event.target.id ? `#${event.target.id}` : ""
+          }`
+        : event.target?.localName
+    }`;
+  });
+  return result;
+}
+
+function eventsAfterClick(eventArray) {
+  const indexAtClick = eventArray.findIndex(e => e.type == "click");
+  if (indexAtClick >= 0) {
+    return eventArray.slice(indexAtClick + 1);
+  }
+  return [];
+}
+
+addEventListener("load", () => {
+  promise_test(async () => {
+    const div1 = document.createElement("div");
+    div1.setAttribute("id", "grandparent");
+    div1.setAttribute("style", "width: 32px; height: 32px");
+    const div2 = document.createElement("div");
+    div2.setAttribute("id", "parent");
+    div2.setAttribute("style", "width: 32px; height: 32px");
+    const div3 = document.createElement("div");
+    div3.setAttribute("id", "child");
+    div3.setAttribute("style", "width: 32px; height: 32px");
+    div1.appendChild(div2);
+    div2.appendChild(div3);
+    document.body.appendChild(div1);
+    const bodyRect = document.body.getBoundingClientRect();
+    const div3Rect = div3.getBoundingClientRect();
+    let events = [];
+    for (const type of ["pointerenter", "pointerleave", "pointerover", "pointerout", "pointermove"]) {
+      for (const node of [document.body, div1, div2, div3]) {
+        node.addEventListener(type, event => {
+          if (event.target == node) {
+            events.push({type: event.type, target: event.target});
+          }
+        }, {capture: true});
+      }
+    }
+    div3.addEventListener("click", event => {
+      div3.remove();
+      events.push({type: event.type, target: event.target});
+    }, {once: true});
+    await new test_driver.Actions()
+      .pointerMove(div3Rect.x + 10, div3Rect.y + 10, {})
+      .pointerDown()
+      .pointerUp() // The clicked in the child, then it's removed from the DOM tree
+      .pointerMove(bodyRect.x + 10, bodyRect.y + 10, {}) // Then, move onto the <body>
+      .send();
+    // FYI: Comparing `pointerenter`s before `click` requires additional
+    // initialization, but it's out of scope of this bug.  Therefore, we
+    // compare only events after `click`.
+    const expectedEvents = [ // no events should be fired on the child due to disconnected
+      { type: "pointerleave", target: div2}, // no pointerout because of first pointer move after the mutation
+      { type: "pointerleave", target: div1},
+      { type: "pointerover", target: document.body},
+      { type: "pointermove", target: document.body},
+    ];
+    assert_equals(
+      stringifyEvents(eventsAfterClick(events)),
+      stringifyEvents(expectedEvents),
+    );
+    div1.remove();
+  }, "After removing the last over element, redundant pointerenter events should not be fired on the ancestors");
+
+  promise_test(async () => {
+    const hostContainer = document.createElement("div");
+    hostContainer.setAttribute("id", "containerOfShadowHost");
+    hostContainer.setAttribute("style", "margin-top: 32px; height: 32px");
+    const host = document.createElement("div");
+    host.setAttribute("id", "shadowHost");
+    host.setAttribute("style", "width: 32px; height: 32px");
+    const root = host.attachShadow({mode: "open"});
+    const rootElementInShadow = document.createElement("div");
+    root.appendChild(rootElementInShadow);
+    rootElementInShadow.setAttribute("id", "divInShadow");
+    rootElementInShadow.setAttribute("style", "width: 32px; height: 32px");
+    hostContainer.appendChild(host);
+    document.body.appendChild(hostContainer);
+    const bodyRect = document.body.getBoundingClientRect();
+    const rootElementInShadowRect = rootElementInShadow.getBoundingClientRect();
+    let events = [];
+    for (const type of ["pointerenter", "pointerleave", "pointerover", "pointerout", "pointermove"]) {
+      for (const node of [document.body, hostContainer, host, root, rootElementInShadow]) {
+        node.addEventListener(type, event => {
+          if (event.target == node) {
+            events.push({type: event.type, target: event.target});
+          }
+        }, {capture: true});
+      }
+    }
+    rootElementInShadow.addEventListener("click", event => {
+      rootElementInShadow.remove();
+      events.push({type: event.type, target: event.target});
+    }, {once: true});
+    await new test_driver.Actions()
+      .pointerMove(rootElementInShadowRect.x + 10, rootElementInShadowRect.y + 10, {})
+      .pointerDown()
+      .pointerUp() // The clicked root element in the shadow is removed here.
+      .pointerMove(bodyRect.x + 10, bodyRect.y + 10, {}) // Then, move onto the <body>
+      .send();
+    // FYI: Comparing `pointerenter`s before `click` requires additional
+    // initialization, but it's out of scope of this bug.  Therefore, we
+    // compare only events after `click`.
+    const expectedEvents = [ // no events should be fired on rootElementInShadow due to disconnected
+      { type: "pointerleave", target: host}, // no pointerout because of first pointer move after the mutation
+      { type: "pointerleave", target: hostContainer},
+      { type: "pointerover", target: document.body},
+      { type: "pointermove", target: document.body},
+    ];
+    assert_equals(
+      stringifyEvents(eventsAfterClick(events)),
+      stringifyEvents(expectedEvents),
+    );
+    hostContainer.remove();
+  }, "After removing the root element in the shadow under the cursor, pointerleave events should be targeted outside the shadow, but redundant pointerenter events should not be fired");
+}, {once: true});
+</script>
+</head>
+<body style="padding-top: 32px"></body>
+</html>
diff --git a/tests/wpt/tests/pointerevents/pointerevent_support.js b/tests/wpt/tests/pointerevents/pointerevent_support.js
index f67038ead4c..f17a76e5f5e 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_support.js
+++ b/tests/wpt/tests/pointerevents/pointerevent_support.js
@@ -44,7 +44,7 @@ const ButtonsBitfield = {
 
 // Check for conformance to PointerEvent interface
 // https://w3c.github.io/pointerevents/#pointerevent-interface
-function check_PointerEvent(event, testNamePrefix) {
+function check_PointerEvent(event, testNamePrefix, standardAttrs = true) {
   if (testNamePrefix === undefined)
     testNamePrefix = "";
 
@@ -52,17 +52,18 @@ function check_PointerEvent(event, testNamePrefix) {
   var pointerTestName = (testNamePrefix ? testNamePrefix + ' ' : '')
     + (expectedPointerType == null ? event.pointerType : expectedPointerType) + ' ' + event.type;
 
-  if (expectedPointerType != null) {
+  if (standardAttrs) {
+    if (expectedPointerType != null) {
+      test(function () {
+        assert_equals(event.pointerType, expectedPointerType);
+      }, pointerTestName + ".pointerType is correct.");
+    }
+
     test(function () {
-      assert_equals(event.pointerType, expectedPointerType);
-    }, pointerTestName + ".pointerType is correct.");
+      assert_true(event instanceof event.target.ownerDocument.defaultView.PointerEvent);
+    }, pointerTestName + " event is a PointerEvent event");
   }
 
-  test(function () {
-    assert_true(event instanceof event.target.ownerDocument.defaultView.PointerEvent);
-  }, pointerTestName + " event is a PointerEvent event");
-
-
   // Check attributes for conformance to WebIDL (existence, type, being readable).
   var idl_type_check = {
     "long": function (v) { return typeof v === "number" && Math.round(v) === v; },
@@ -74,65 +75,68 @@ function check_PointerEvent(event, testNamePrefix) {
 
   // Check values for inherited attributes.
   // https://w3c.github.io/pointerevents/#attributes-and-default-actions
-  test(function () {
-    assert_implements_optional("fromElement" in event);
-    assert_equals(event.fromElement, null);
-  }, pointerTestName + ".fromElement value is null");
-  test(function () {
-    assert_implements_optional("toElement" in event);
-    assert_equals(event.toElement, null);
-  }, pointerTestName + ".toElement value is null");
-  test(function () {
-    assert_equals(event.isTrusted, true);
-  }, pointerTestName + ".isTrusted value is true");
-  test(function () {
-    let expected = (event.type != 'pointerenter' && event.type != 'pointerleave');
-    assert_equals(event.composed, expected);
-  }, pointerTestName + ".composed value is valid");
-  test(function () {
-    let expected = (event.type != 'pointerenter' && event.type != 'pointerleave');
-    assert_equals(event.bubbles, expected);
-  }, pointerTestName + ".bubbles value is valid");
-  test(function () {
-    let cancelable_events = [
-      'pointerdown', 'pointermove', 'pointerup', 'pointerover', 'pointerout'
-    ];
-    assert_equals(event.cancelable, cancelable_events.includes(event.type));
-  }, pointerTestName + ".cancelable value is valid");
+  if (!standardAttrs) {
+    test(function () {
+      assert_implements_optional("fromElement" in event);
+      assert_equals(event.fromElement, null);
+    }, pointerTestName + ".fromElement value is null");
+    test(function () {
+      assert_implements_optional("toElement" in event);
+      assert_equals(event.toElement, null);
+    }, pointerTestName + ".toElement value is null");
+  } else {
+    test(function () {
+      assert_equals(event.isTrusted, true);
+    }, pointerTestName + ".isTrusted value is true");
+    test(function () {
+      let expected = (event.type != 'pointerenter' && event.type != 'pointerleave');
+      assert_equals(event.composed, expected);
+    }, pointerTestName + ".composed value is valid");
+    test(function () {
+      let expected = (event.type != 'pointerenter' && event.type != 'pointerleave');
+      assert_equals(event.bubbles, expected);
+    }, pointerTestName + ".bubbles value is valid");
+    test(function () {
+      let cancelable_events = [
+        'pointerdown', 'pointermove', 'pointerup', 'pointerover', 'pointerout'
+      ];
+      assert_equals(event.cancelable, cancelable_events.includes(event.type));
+    }, pointerTestName + ".cancelable value is valid");
 
-  // Check the pressure value.
-  // https://w3c.github.io/pointerevents/#dom-pointerevent-pressure
-  test(function () {
-    assert_greater_than_equal(event.pressure, 0, "pressure is greater than or equal to 0");
-    assert_less_than_equal(event.pressure, 1, "pressure is less than or equal to 1");
+    // Check the pressure value.
+    // https://w3c.github.io/pointerevents/#dom-pointerevent-pressure
+    test(function () {
+      assert_greater_than_equal(event.pressure, 0, "pressure is greater than or equal to 0");
+      assert_less_than_equal(event.pressure, 1, "pressure is less than or equal to 1");
 
-    if (event.buttons === 0) {
-      assert_equals(event.pressure, 0, "pressure is 0 with no buttons pressed");
-    } else {
-      assert_greater_than(event.pressure, 0, "pressure is greater than 0 with a button pressed");
-      if (event.pointerType === "mouse") {
-        assert_equals(event.pressure, 0.5, "pressure is 0.5 for mouse with a button pressed");
+      if (event.buttons === 0) {
+        assert_equals(event.pressure, 0, "pressure is 0 with no buttons pressed");
+      } else {
+        assert_greater_than(event.pressure, 0, "pressure is greater than 0 with a button pressed");
+        if (event.pointerType === "mouse") {
+          assert_equals(event.pressure, 0.5, "pressure is 0.5 for mouse with a button pressed");
+        }
       }
+    }, pointerTestName + ".pressure value is valid");
+
+    // Check mouse-specific properties.
+    if (event.pointerType === "mouse") {
+      test(function () {
+        assert_equals(event.width, 1, "width of mouse should be 1");
+        assert_equals(event.height, 1, "height of mouse should be 1");
+        assert_equals(event.tiltX, 0, event.type + ".tiltX is 0 for mouse");
+        assert_equals(event.tiltY, 0, event.type + ".tiltY is 0 for mouse");
+        assert_true(event.isPrimary, event.type + ".isPrimary is true for mouse");
+      }, pointerTestName + " properties for pointerType = mouse");
     }
-  }, pointerTestName + ".pressure value is valid");
 
-  // Check mouse-specific properties.
-  if (event.pointerType === "mouse") {
-    test(function () {
-      assert_equals(event.width, 1, "width of mouse should be 1");
-      assert_equals(event.height, 1, "height of mouse should be 1");
-      assert_equals(event.tiltX, 0, event.type + ".tiltX is 0 for mouse");
-      assert_equals(event.tiltY, 0, event.type + ".tiltY is 0 for mouse");
-      assert_true(event.isPrimary, event.type + ".isPrimary is true for mouse");
-    }, pointerTestName + " properties for pointerType = mouse");
-  }
-
-  // Check "pointerup" specific properties.
-  if (event.type == "pointerup") {
-    test(function () {
-      assert_equals(event.width, 1, "width of pointerup should be 1");
-      assert_equals(event.height, 1, "height of pointerup should be 1");
-    }, pointerTestName + " properties for pointerup");
+    // Check "pointerup" specific properties.
+    if (event.type == "pointerup") {
+      test(function () {
+        assert_equals(event.width, 1, "width of pointerup should be 1");
+        assert_equals(event.height, 1, "height of pointerup should be 1");
+      }, pointerTestName + " properties for pointerup");
+    }
   }
 }
 
diff --git a/tests/wpt/tests/quirks/class-names-across-iframes-ref.html b/tests/wpt/tests/quirks/class-names-across-iframes-ref.html
new file mode 100644
index 00000000000..47ff69d30b7
--- /dev/null
+++ b/tests/wpt/tests/quirks/class-names-across-iframes-ref.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<title>Verifies matching of class names across iframes with/without quirks</title>
+<body>
+<iframe srcdoc="<!DOCTYPE html><html><head><style>p.Testing{color:green;}</style></head><body><p class='Testing'>text that should be green</p></body></html>");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/quirks/class-names-across-iframes.html b/tests/wpt/tests/quirks/class-names-across-iframes.html
new file mode 100644
index 00000000000..a40a0e9dc53
--- /dev/null
+++ b/tests/wpt/tests/quirks/class-names-across-iframes.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<link rel="match" href="class-names-across-iframes-ref.html" />
+<html>
+<title>Verifies matching of class names across iframes with/without quirks</title>
+<body>
+<template><p class="Testing">text that should be green</p></template>
+
+<script>
+  /*
+    This test is a regression test for a bug in chrome. See
+    https://crbug.com/1474382. It triggers quirks mode in the iframe
+    and then exits quirks mode.
+    */
+  const iframe = document.createElement('iframe');
+  document.body.append(iframe);
+
+  const doc = iframe.contentWindow.document;
+
+  const data = document.querySelector('template').innerHTML;
+  const body = doc.createElement('body');
+  body.innerHTML = data;
+
+  doc.open();
+  doc.write(`<!DOCTYPE html><html><head><style>p.Testing{color:green;}</style></head><body>${data}</body></html>`);
+  doc.close();
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/service-workers/service-worker/fetch-canvas-tainting-video-with-range-request.https.html b/tests/wpt/tests/service-workers/service-worker/fetch-canvas-tainting-video-with-range-request.https.html
index 8fef9c34fa3..0ee41e96f29 100644
--- a/tests/wpt/tests/service-workers/service-worker/fetch-canvas-tainting-video-with-range-request.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/fetch-canvas-tainting-video-with-range-request.https.html
@@ -19,7 +19,8 @@
 // (the "Range" HTTP request header specifies a byte range). The server responds
 // to these with 206 Partial Content for the given range.
 let unique = 0; // See https://bugzilla.mozilla.org/show_bug.cgi?id=1129121
-function range_request_test(script, expected, description) {
+function range_request_test(script, expected, description,
+                            {remote_origin_src} = {}) {
   promise_test(t => {
       let frame;
       let registration;
@@ -41,8 +42,12 @@ function range_request_test(script, expected, description) {
             frame = f;
             // Add "?PartialContent&VIDEO" to get a video resource from the
             // server using range requests.
-            const video_url =
+            let video_url =
               'fetch-access-control.py?PartialContent&VIDEO=' + unique++;
+            if (remote_origin_src) {
+              video_url = get_host_info().HTTPS_REMOTE_ORIGIN +
+                base_path() + 'resources/' + video_url;
+            }
             return frame.contentWindow.create_test_case_promise(video_url);
           })
         .then(result => {
@@ -90,5 +95,21 @@ range_request_test(
 //     non-opaque responses. The first request uses 'cors' mode to
 //     receive an non-opaque response, and subsequent range requests use
 //     'no-cors' to receive non-opaque responses. Like (2) this is not possible.
+
+// (7) The first Range response is synthesized using the Response constructor.
+//     Subsequent responses are same-origin, not handled by the service worker.
+range_request_test(
+  'resources/range-request-with-synth-head-worker.js',
+  'NOT_TAINTED',
+  'synth and same-origin fallback range responses');
+
+// (8) The first Range response is synthesized using the Response constructor.
+//     Subsequent responses are cross-origin, not handled by the service worker,
+//     no-cors and opaque.
+range_request_test(
+  'resources/range-request-with-synth-head-worker.js',
+  'LOAD_ERROR',
+  'synth and cross-origin fallback range responses',
+  {remote_origin_src: true});
 </script>
 </body>
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/range-request-with-synth-head-worker.js b/tests/wpt/tests/service-workers/service-worker/resources/range-request-with-synth-head-worker.js
new file mode 100644
index 00000000000..6025d91b1a2
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/resources/range-request-with-synth-head-worker.js
@@ -0,0 +1,36 @@
+// This worker is meant to test range requests where the initial response
+// synthesizes a 206 Partial Content response with leading bytes.
+// Then the worker lets subsequent range requests fall back to network.
+
+let initial = true;
+function is_initial_request() {
+  const old = initial;
+  initial = false;
+  return old;
+}
+
+self.addEventListener('fetch', e => {
+    const url = new URL(e.request.url);
+    if (url.search.indexOf('VIDEO') == -1) {
+      // Fall back for non-video.
+      return;
+    }
+
+    // Synthesize the response to the first request.
+    if (is_initial_request()) {
+      // Consistent with fetch-access-control.py?VIDEO
+      const init = {
+        status: 206,
+        headers: {
+          "Accept-Ranges": "bytes",
+          "Content-Type": "video/webm",
+          "Content-Range": "bytes 0-1/44447",
+          "Content-Length": "2",
+        },
+      };
+      e.respondWith(new Response(new Uint8Array([0x1a, 0x45]), init));
+      return;
+    }
+
+    // Fall back for subsequent range requests.
+  });
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.css b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.css
new file mode 100644
index 00000000000..c812213f530
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.css
@@ -0,0 +1,3 @@
+body {
+  width: 100%;
+}
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.js
new file mode 100644
index 00000000000..ed6f0e5f980
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.js
@@ -0,0 +1 @@
+window.router_condition_request_destination_script = true;
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.py b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.py
new file mode 100644
index 00000000000..c2bcfce67c5
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/direct.py
@@ -0,0 +1,7 @@
+import os
+import time
+
+def main(request, response):
+    if 'server_slow' in request.url_parts.query:
+        time.sleep(0.2)
+    return 200, [(b'Content-Type', b'text/plain')], u'Network with %s request' % request.method
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/imported-sw.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/imported-sw.js
new file mode 100644
index 00000000000..04a894d77f8
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/imported-sw.js
@@ -0,0 +1,13 @@
+'use strict';
+
+import {routerRules} from './router-rules.js';
+
+const params = new URLSearchParams(location.search);
+const key = params.get('imported-sw-router-key');
+
+if (key) {
+  self.addEventListener('install', async e => {
+    await e.addRoutes(routerRules[key]);
+    self.skipWaiting();
+  });
+}
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/router-rules.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/router-rules.js
index 792455dac36..4e6f8bb9559 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/router-rules.js
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/router-rules.js
@@ -1,6 +1,3 @@
-// Copyright 2023 The Chromium Authors
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
 const routerRules = {
   'condition-urlpattern-constructed-source-network': [{
     condition: {urlPattern: new URLPattern({pathname: '/**/direct.txt'})},
@@ -30,9 +27,20 @@ const routerRules = {
       [{condition: {requestMode: 'no-cors'}, source: 'network'}],
   'condition-request-navigate-source-cache':
       [{condition: {requestMode: 'navigate'}, source: 'cache'}],
-  'condition-invalid-request-method':
-      [{condition: {requestMethod: String.fromCodePoint(0x3042)},
-        source: 'network'}],
+  'condition-request-method-get-network':
+      [{condition: {requestMethod: 'GET'}, source: 'network'}],
+  'condition-request-method-post-network':
+      [{condition: {requestMethod: 'POST'}, source: 'network'}],
+  'condition-request-method-put-network':
+      [{condition: {requestMethod: 'PUT'}, source: 'network'}],
+  'condition-request-method-delete-network':
+      [{condition: {requestMethod: 'DELETE'}, source: 'network'}],
+  'condition-invalid-request-method': [{
+    condition: {requestMethod: String.fromCodePoint(0x3042)},
+    source: 'network'
+  }],
+  'condition-request-destination-script-network':
+      [{condition: {requestDestination: 'script'}, source: 'network'}],
   'condition-or-source-network': [{
     condition: {
       or: [
@@ -46,6 +54,8 @@ const routerRules = {
   }],
   'condition-request-source-fetch-event':
       [{condition: {requestMode: 'no-cors'}, source: 'fetch-event'}],
+  'condition-urlpattern-string-source-fetch-event':
+      [{condition: {urlPattern: '/**/*'}, source: 'fetch-event'}],
   'multiple-router-rules': [
     {
       condition: {
@@ -54,7 +64,13 @@ const routerRules = {
       source: 'network'
     },
     {condition: {urlPattern: '/**/direct.html'}, source: 'network'}
-  ]
+  ],
+  'condition-urlpattern-string-source-race-network-and-fetch-handler': [
+    {
+      condition: {urlPattern: '/**/direct.py'},
+      source: 'race-network-and-fetch-handler'
+    },
+  ],
 };
 
 export {routerRules};
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-helpers.sub.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-helpers.sub.js
index cf58181ceac..cf34e98635f 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-helpers.sub.js
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-helpers.sub.js
@@ -66,3 +66,11 @@ function iframeTest(url, ruleKey, callback, name) {
     await callback(t, iframe.contentWindow, worker);
   }, name);
 };
+
+function randomString() {
+  let result = "";
+  for (let i = 0; i < 5; i++) {
+    result += String.fromCharCode(97 + Math.floor(Math.random() * 26));
+  }
+  return result;
+}
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-race-network-and-fetch-handler-sw.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-race-network-and-fetch-handler-sw.js
new file mode 100644
index 00000000000..468116eea80
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-race-network-and-fetch-handler-sw.js
@@ -0,0 +1,57 @@
+'use strict';
+
+import {routerRules} from './router-rules.js';
+import {
+  recordRequest,
+  recordError,
+  getRecords,
+  resetRecords } from './static-router-sw.sub.js';
+
+import './imported-sw.js';
+
+self.addEventListener('install', async e => {
+  e.waitUntil(caches.open('v1').then(
+      cache => {cache.put('cache.txt', new Response('From cache'))}));
+
+  const params = new URLSearchParams(location.search);
+  const key = params.get('key');
+  try {
+    await e.addRoutes(routerRules[key]);
+  } catch (e) {
+    recordError(e);
+  }
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', e => {
+  e.waitUntil(clients.claim());
+});
+
+self.addEventListener('fetch', function(event) {
+  recordRequest(event.request);
+  const url = new URL(event.request.url);
+
+
+  // Force slow response
+  if (url.searchParams.has('sw_slow')) {
+    const start = Date.now();
+    while (true) {
+      if (Date.now() - start > 200) {
+        break;
+      }
+    }
+  }
+
+  const nonce = url.searchParams.get('nonce');
+  event.respondWith(new Response(nonce));
+});
+
+self.addEventListener('message', function(event) {
+  if (event.data.reset) {
+    resetRecords();
+  }
+  if (event.data.port) {
+    const {requests, errors} = getRecords();
+    event.data.port.postMessage({requests, errors});
+  }
+});
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
index 67702a2a01f..07409ec42c8 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
@@ -7,6 +7,8 @@ import {
   getRecords,
   resetRecords } from './static-router-sw.sub.js';
 
+import './imported-sw.js';
+
 self.addEventListener('install', async e => {
   e.waitUntil(caches.open('v1').then(
       cache => {cache.put('cache.txt', new Response('From cache'))}));
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.sub.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.sub.js
index e12a588afce..04f9c5533a4 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.sub.js
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.sub.js
@@ -1,8 +1,8 @@
-var requests = [];
-var errors = [];
+let requests = [];
+let errors = [];
 
 const recordRequest = req => {
-  requests.push({url: req.url, mode: req.mode});
+  requests.push({url: req.url, mode: req.mode, destination: req.destination});
 };
 
 const recordError = (error) => {
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-fetch-event.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-fetch-event.https.html
new file mode 100644
index 00000000000..167e3af0090
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-fetch-event.https.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>
+  Static Router: routers are evaluated with the fetch-event source.
+</title>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js">
+</script>
+<script src="resources/static-router-helpers.sub.js">
+</script>
+<body>
+<script>
+const ROUTER_KEY = 'condition-urlpattern-string-source-fetch-event';
+const REGISTERED_ROUTE = 'resources/simple.html';
+
+promise_test(async t => {
+  const worker = await registerAndActivate(t, ROUTER_KEY);
+  const rnd = randomString();
+  const iframe = await createIframe(t, `${REGISTERED_ROUTE}?nonce=${rnd}`);
+  const {errors, requests} = await get_info_from_worker(worker);
+
+  assert_equals(errors.length, 0);
+  assert_equals(requests.length, 1);
+  assert_equals(iframe.contentWindow.document.body.innerText, rnd);
+}, 'Main resource matched the rule with fetch-event source');
+
+iframeTest(REGISTERED_ROUTE, ROUTER_KEY, async (t, iwin, worker) => {
+  const rnd = randomString();
+  const response = await iwin.fetch(`?nonce=${rnd}`);
+  assert_equals(response.status, 200);
+  assert_equals(await response.text(), rnd);
+  const {requests} = await get_info_from_worker(worker);
+  // Main resource request + subreosurce request = 2.
+  assert_equals(requests.length, 2);
+}, 'Subresource load matched the rule fetch-event source');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-main-resource.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-main-resource.https.html
index d9a3d2c2ee5..fc93a4f7c90 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-main-resource.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-main-resource.https.html
@@ -15,12 +15,10 @@ const ROUTER_RULE_KEY_IGNORE_CASE =
   'condition-urlpattern-constructed-ignore-case-source-network';
 const ROUTER_RULE_KEY_RESPECT_CASE =
   'condition-urlpattern-constructed-respect-case-source-network';
-const ROUTER_RULE_KEY_MULTIPLE_RULES = 'multiple-router-rules';
 const ROUTER_RULE_KEY_URLPATTERN_CACHE =
   'condition-urlpattern-string-source-cache';
 const ROUTER_RULE_KEY_REQUEST_CACHE = 'condition-request-navigate-source-cache';
 const REGISTERED_ROUTE = 'resources/direct.txt';
-const ADDITIONAL_REGISTERED_ROUTE = 'resources/direct.html';
 const CACHED_ROUTE = 'resources/cache.txt';
 const NON_REGISTERED_ROUTE = 'resources/simple.html';
 const host_info = get_host_info();
@@ -52,21 +50,6 @@ iframeTest(NON_REGISTERED_ROUTE, ROUTER_RULE_KEY, async (t, iwin, worker) => {
   assert_equals(requests[0].mode, 'navigate');
 }, 'Main resource load not matched with the condition');
 
-promise_test(async t => {
-  const worker = await registerAndActivate(t, ROUTER_RULE_KEY_MULTIPLE_RULES);
-
-  // Matched with the first rule.
-  const iframe = await createIframe(t, REGISTERED_ROUTE);
-  assert_equals(iframe.contentWindow.document.body.innerText, "Network\n");
-
-  // Matched with the second rule.
-  const second_iframe = await createIframe(t, ADDITIONAL_REGISTERED_ROUTE);
-  assert_equals(second_iframe.contentWindow.document.body.innerText, "Here's a direct html from network.");
-
-  const {requests} = await get_info_from_worker(worker);
-  assert_equals(requests.length, 0);
-}, 'Main reosurce load matched with the service worker having multiple rules');
-
 iframeTest(CACHED_ROUTE, ROUTER_RULE_KEY_URLPATTERN_CACHE, async (t, iwin, worker) => {
   const {requests} = await get_info_from_worker(worker);
   assert_equals(requests.length, 0);
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-multiple-router-registrations.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-multiple-router-registrations.https.html
new file mode 100644
index 00000000000..dd7ff1e4e9d
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-multiple-router-registrations.https.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>
+  Static Router: routers are registered multiple times.
+</title>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js">
+</script>
+<script src="resources/static-router-helpers.sub.js">
+</script>
+<body>
+<script>
+const ROUTER_KEY_MULTIPLE_RULES = 'multiple-router-rules';
+const ROUTER_KEY_1 = 'condition-urlpattern-string-source-network';
+const ROUTER_KEY_2 = 'condition-request-method-post-network';
+
+const REGISTERED_ROUTE_1 = 'resources/direct.txt';
+const REGISTERED_ROUTE_2 = 'resources/direct.html';
+const REGISTERED_ROUTE_3 = 'direct.py';
+
+promise_test(async t => {
+  const worker = await registerAndActivate(t, ROUTER_KEY_MULTIPLE_RULES);
+
+  // Matched with the first rule.
+  const iframe = await createIframe(t, REGISTERED_ROUTE_1);
+  assert_equals(iframe.contentWindow.document.body.innerText, "Network\n");
+
+  // Matched with the second rule.
+  const second_iframe = await createIframe(t, REGISTERED_ROUTE_2);
+  assert_equals(second_iframe.contentWindow.document.body.innerText, "Here's a direct html from network.");
+
+  const {requests} = await get_info_from_worker(worker);
+  assert_equals(requests.length, 0);
+}, 'Main reosurce load matched with the service worker having multiple rules');
+
+promise_test(async t => {
+  const worker = await registerAndActivate(t,
+    `${ROUTER_KEY_1}&imported-sw-router-key=${ROUTER_KEY_2}`);
+
+  // Matched with the first rule.
+  const iframe = await createIframe(t, REGISTERED_ROUTE_1);
+  assert_equals(iframe.contentWindow.document.body.innerText, "Network\n");
+  let info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 0);
+
+  // Matched with the second rule, which is registered in the service worker
+  // loaded via `import` by the main script.
+  const response = await iframe.contentWindow.fetch(REGISTERED_ROUTE_3, {method: 'POST'});
+  assert_equals(response.status, 200);
+  assert_equals(await response.text(), "Network with POST request");
+  info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 0);
+}, 'Resource load matched with the rule registered in the imported service worker');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-race-network-and-fetch-handler.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-race-network-and-fetch-handler.https.html
new file mode 100644
index 00000000000..de31f6c53ff
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-race-network-and-fetch-handler.https.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>
+  Static Router: routers are evaluated with the request desitnation condition.
+</title>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js">
+</script>
+<script src="resources/static-router-helpers.sub.js">
+</script>
+<body>
+<script>
+const ROUTER_KEY = 'condition-urlpattern-string-source-race-network-and-fetch-handler';
+const SW_SRC = 'resources/static-router-race-network-and-fetch-handler-sw.js';
+const FRAME_SRC = 'resources/direct.py';
+
+promise_test(async t => {
+  const rnd = randomString();
+  const worker = await registerAndActivate(t, ROUTER_KEY, SW_SRC);
+  const iframe = await createIframe(t, `${FRAME_SRC}?nonce=${rnd}&server_slow`);
+  // Expect the response from the fetch handler.
+  assert_equals(iframe.contentWindow.document.body.innerText, rnd);
+  const {requests}  = await get_info_from_worker(worker);
+  assert_equals(requests.length, 1);
+}, 'Main resource load matched the rule with race-network-and-fetch-handler source, and the fetch handler response is faster than the server response');
+
+promise_test(async t => {
+  const rnd = randomString();
+  const worker = await registerAndActivate(t, ROUTER_KEY, SW_SRC);
+  const iframe = await createIframe(t, `${FRAME_SRC}?nonce=${rnd}&sw_slow`);
+  // Expect the response from the netowrk request.
+  assert_equals(iframe.contentWindow.document.body.innerText, "Network with GET request");
+  // Ensure the fetch handler is also executed.
+  const {requests}  = await get_info_from_worker(worker);
+  assert_equals(requests.length, 1);
+}, 'Main resource load matched the rule with race-network-and-fetch-handler source, and the server reseponse is faster than the fetch handler');
+
+promise_test(async t => {
+  const rnd = randomString();
+  const worker = await registerAndActivate(t, ROUTER_KEY, SW_SRC);
+  const iframe = await createIframe(t, FRAME_SRC);
+  // Expect the response from the fetch handler.
+  const response = await iframe.contentWindow.fetch(`?nonce=${rnd}&server_slow`);
+  assert_equals(response.status, 200);
+  assert_equals(await response.text(), rnd);
+  const {requests}  = await get_info_from_worker(worker);
+  assert_equals(requests.length, 2);
+}, 'Subresource load matched the rule with race-network-and-fetch-handler source, and the fetch handler response is faster than the server response');
+
+promise_test(async t => {
+  const rnd = randomString();
+  const worker = await registerAndActivate(t, ROUTER_KEY, SW_SRC);
+  const iframe = await createIframe(t, FRAME_SRC);
+  // Expect the response from the network request.
+  const response = await iframe.contentWindow.fetch(`?nonce=${rnd}&sw_slow`);
+  assert_equals(response.status, 200);
+  assert_equals(await response.text(), "Network with GET request");
+  // Ensure the fetch handler is also executed.
+  const {requests}  = await get_info_from_worker(worker);
+  assert_equals(requests.length, 2);
+}, 'Subresource load matched the rule with race-network-and-fetch-handler source, and the server reseponse is faster than the fetch handler');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-destination.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-destination.https.html
new file mode 100644
index 00000000000..55ad6da31aa
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-destination.https.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>
+  Static Router: routers are evaluated with the request desitnation condition.
+</title>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js">
+</script>
+<script src="resources/static-router-helpers.sub.js">
+</script>
+<body>
+<script>
+const ROUTER_KEY_DESTINATION_SCRIPT = 'condition-request-destination-script-network';
+const FRAME_SRC = 'resources/direct.html';
+const SCRIPT_SRC = 'direct.js';
+const STYLE_SRC = 'direct.txt';
+
+const appendScript = async (iwin, src) => {
+  const promise = new Promise(resolve => {
+    const script = iwin.document.createElement('script');
+    script.src = src;
+    iwin.document.body.appendChild(script);
+    script.onload = () => {
+      resolve(script);
+    };
+  });
+
+  return promise;
+};
+
+const appendCSS = async (iwin, src) => {
+  const promise = new Promise(resolve => {
+    const link = iwin.document.createElement('link');
+    link.rel = 'stylesheet';
+    link.href = src;
+    iwin.document.head.appendChild(link);
+    link.onload = () => {
+      resolve(link);
+    };
+  });
+
+  return promise;
+};
+
+promise_test(async t => {
+  const worker = await registerAndActivate(t, ROUTER_KEY_DESTINATION_SCRIPT);
+  const iframe = await createIframe(t, FRAME_SRC);
+
+  let info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 1);
+  assert_equals(info.requests[0].destination, 'iframe');
+
+  // JavaScript is not handled by fetch handler.
+  await appendScript(iframe.contentWindow, SCRIPT_SRC);
+  assert_equals(iframe.contentWindow.router_condition_request_destination_script, true);
+  info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 1);
+}, 'Subreosurce load matched with the requestMethod script condition');
+
+promise_test(async t => {
+  const worker = await registerAndActivate(t, ROUTER_KEY_DESTINATION_SCRIPT);
+  const iframe = await createIframe(t, FRAME_SRC);
+
+  let info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 1);
+  assert_equals(info.requests[0].destination, 'iframe');
+
+  // Stylesheet is not handled by fetch handler.
+  await appendCSS(iframe.contentWindow, STYLE_SRC);
+  info = await get_info_from_worker(worker);
+  assert_equals(info.requests.length, 2);
+  assert_equals(info.requests[1].destination, 'style');
+}, 'Subreosurce load not matched with the requestMethod script condition');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-method.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-method.https.html
new file mode 100644
index 00000000000..8e219532a3e
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-request-method.https.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>
+  Static Router: routers are evaluated with the request method condition.
+</title>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js">
+</script>
+<script src="resources/static-router-helpers.sub.js">
+</script>
+<body>
+<script>
+const ROUTER_KEY_MEHOD_GET = 'condition-request-method-get-network';
+const ROUTER_KEY_MEHOD_POST = 'condition-request-method-post-network';
+const ROUTER_KEY_MEHOD_PUT = 'condition-request-method-put-network';
+const ROUTER_KEY_MEHOD_DELETE = 'condition-request-method-delete-network';
+const REQUET_SRC = 'resources/direct.py';
+
+iframeTest(REQUET_SRC, ROUTER_KEY_MEHOD_GET, async (t, iwin, worker) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd);
+  assert_equals(await response.text(), "Network with GET request");
+  const {requests} = await get_info_from_worker(worker);
+  assert_equals(requests.length, 0);
+}, 'Subresource load matched with the requestMethod GET condition');
+
+iframeTest(REQUET_SRC, ROUTER_KEY_MEHOD_POST, async (t, iwin, worker) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd, {method: 'POST'});
+  assert_equals(await response.text(), "Network with POST request");
+  const {requests} = await get_info_from_worker(worker);
+  // The navigation request is the only request handled by fetch handler.
+  assert_equals(requests.length, 1);
+  assert_equals(requests[0].mode, 'navigate');
+}, 'Subresource load matched with the requestMethod POST condition');
+
+iframeTest(REQUET_SRC, ROUTER_KEY_MEHOD_PUT, async (t, iwin, worker) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd, {method: 'PUT'});
+  assert_equals(await response.text(), "Network with PUT request");
+  const {requests} = await get_info_from_worker(worker);
+  // The navigation request is the only request handled by fetch handler.
+  assert_equals(requests.length, 1);
+  assert_equals(requests[0].mode, 'navigate');
+}, 'Subresource load matched with the requestMethod PUT condition');
+
+iframeTest(REQUET_SRC, ROUTER_KEY_MEHOD_DELETE, async (t, iwin, worker) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd, {method: 'DELETE'});
+  assert_equals(await response.text(), "Network with DELETE request");
+  const {requests} = await get_info_from_worker(worker);
+  // The navigation request is the only request handled by fetch handler.
+  assert_equals(requests.length, 1);
+  assert_equals(requests[0].mode, 'navigate');
+}, 'Subresource load matched with the requestMethod DELETE condition');
+</script>
+</body>
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
index c0eb8e9f2f5..3f7902a8723 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
@@ -5,6 +5,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/test-helpers.sub.js"></script>
 <script src="/common/get-host-info.sub.js"></script>
+<script src="resources/static-router-helpers.sub.js"></script>
 <body>
 <script>
 const SCRIPT = 'resources/static-router-sw.js';
@@ -34,38 +35,6 @@ const OR_TEST_FILES = [
   'resources/or-test/does-not-exist.text',
 ];
 
-// Register a service worker, then create an iframe at url.
-function iframeTest(url, ruleKey, callback, name) {
-  return promise_test(async t => {
-    const swURL = `${SCRIPT}?key=${ruleKey}`;
-    const reg = await service_worker_unregister_and_register(
-      t, swURL, SCOPE, {type: 'module'});
-    add_completion_callback(() => reg.unregister());
-    const worker = reg.installing;
-    await wait_for_state(t, worker, 'activated');
-    const iframe = await with_iframe(url);
-    const iwin = iframe.contentWindow;
-    t.add_cleanup(() => iframe.remove());
-    await callback(t, iwin, worker);
-  }, name);
-}
-
-function randomString() {
-  let result = "";
-  for (let i = 0; i < 5; i++) {
-    result += String.fromCharCode(97 + Math.floor(Math.random() * 26));
-  }
-  return result;
-}
-
-function get_fetched_urls(worker) {
-  return new Promise(function(resolve) {
-      var channel = new MessageChannel();
-      channel.port1.onmessage = function(msg) { resolve(msg); };
-      worker.postMessage({port: channel.port2}, [channel.port2]);
-    });
-}
-
 iframeTest(HTML_FILE, ROUTER_RULE_KEY_URL_PATTERN_CONSTRUCTED, async (t, iwin) => {
   const rnd = randomString();
   const response = await iwin.fetch('?nonce=' + rnd);
@@ -89,8 +58,7 @@ iframeTest(TXT_FILE, ROUTER_RULE_KEY_URL_PATTERN_CONSTRUCTED, async (t, iwin, wo
   const origin = get_host_info().HTTPS_REMOTE_ORIGIN;
   const response = await iwin.fetch(
     `${origin}/${TXT_FILE}?nonce=${rnd}`, {mode: 'no-cors'});
-  const fetched_urls = await get_fetched_urls(worker);
-  const {requests} = fetched_urls.data;
+  const {requests} = await get_info_from_worker(worker);
   assert_equals(requests.length, 0);
   assert_equals(response.type, 'opaque');
 }, 'Subresource cross origin load matched with URLPattern condition via constructed object');
@@ -121,8 +89,7 @@ iframeTest(TXT_FILE, ROUTER_RULE_KEY_URL_PATTERN_URLPATTERNINIT, async (t, iwin,
   const rnd = randomString();
   const origin = get_host_info().HTTPS_REMOTE_ORIGIN;
   const response = await iwin.fetch(`${origin}/${TXT_FILE}?nonce=${rnd}`);
-  const fetched_urls = await get_fetched_urls(worker);
-  const {requests} = fetched_urls.data;
+  const {requests} = await get_info_from_worker(worker);
   assert_equals(requests.length, 1);
   assert_equals(await response.text(), rnd);
 }, 'Subresource cross origin load not matched with URLPattern condition via URLPatternInit');
@@ -141,8 +108,7 @@ iframeTest(TXT_FILE, ROUTER_RULE_KEY_URL_PATTERN_STRING, async (t, iwin, worker)
   const rnd = randomString();
   const origin = get_host_info().HTTPS_REMOTE_ORIGIN;
   const response = await iwin.fetch(`${origin}/${TXT_FILE}?nonce=${rnd}`);
-  const fetched_urls = await get_fetched_urls(worker);
-  const {requests} = fetched_urls.data;
+  const {requests} = await get_info_from_worker(worker);
   assert_equals(requests.length, 1);
   assert_equals(await response.text(), rnd);
 }, 'Subresource cross origin load not matched with URLPattern condition via string');
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-repeats.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-repeats.html
index 3da9cff360c..5a992c6c69d 100644
--- a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-repeats.html
+++ b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-repeats.html
@@ -50,23 +50,30 @@ test((t) => {
 
 <div id=open2>
   <template shadowrootmode=open shadowrootdelegatesfocus>
-    Open, delegates focus (not the default), named slot assignment (the default)
+    Open, delegates focus (not the default),
+    named slot assignment (the default), clonable (the default for declarative)
   </template>
 </div>
 
 <script>
 test((t) => {
   assert_throws_dom("NotSupportedError",() => {
-    open2.attachShadow({mode: "closed", delegatesFocus: true, slotAssignment: "named"});
+    open2.attachShadow({mode: "closed", delegatesFocus: true, slotAssignment: "named", clonable: true});
   },'Mismatched shadow root type should throw');
   assert_throws_dom("NotSupportedError",() => {
-    open2.attachShadow({mode: "open", delegatesFocus: false, slotAssignment: "named"});
+    open2.attachShadow({mode: "open", delegatesFocus: false, slotAssignment: "named", clonable: true});
   },'Mismatched shadow root delegatesFocus should throw');
   assert_throws_dom("NotSupportedError",() => {
-    open2.attachShadow({mode: "open", delegatesFocus: true, slotAssignment: "manual"});
+    open2.attachShadow({mode: "open", delegatesFocus: true, slotAssignment: "manual", clonable: true});
   },'Mismatched shadow root slotAssignment should throw');
+  // See https://github.com/whatwg/html/issues/10107: the behavior of the
+  // clonable flag is still being discussed.
+  // assert_throws_dom("NotSupportedError",() => {
+  //   open2.attachShadow({mode: "open", delegatesFocus: true, slotAssignment: "named", clonable: false});
+  // },'Mismatched shadow root clonable should throw');
+
   const initialShadow = open2.shadowRoot;
-  const shadow = open2.attachShadow({mode: "open", delegatesFocus: true, slotAssignment: "named"}); // Shouldn't throw
+  const shadow = open2.attachShadow({mode: "open", delegatesFocus: true, slotAssignment: "named", clonable: true}); // Shouldn't throw
   assert_equals(shadow,initialShadow,'Same shadow should be returned');
   assert_equals(shadow.textContent,'','Shadow should be empty');
 },'Calling attachShadow() on declarative shadow root must match all parameters');
diff --git a/tests/wpt/tests/shadow-dom/focus/text-selection-with-delegatesFocus.html b/tests/wpt/tests/shadow-dom/focus/text-selection-with-delegatesFocus.html
new file mode 100644
index 00000000000..7c92d35394f
--- /dev/null
+++ b/tests/wpt/tests/shadow-dom/focus/text-selection-with-delegatesFocus.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<body>
+    <x-shadow id="withoutFocus"></x-shadow>
+    <x-shadow id="withFocus"></x-shadow>
+</body>
+
+<script>
+'use strict';
+
+/**
+ * build shadow-root with delegates focus, a focusable element, and an (ideally) selectable text
+ */
+function buildShadowRootWithSelectableText( element, shouldDelegateFocus ) {
+    element.attachShadow({ mode: 'open', delegatesFocus: shouldDelegateFocus });
+    const span = document.createElement('span');
+    span.textContent = 'Example Text to Select ';
+    const button = document.createElement('button');
+    button.textContent = 'Button';
+    element.shadowRoot.append(span, button);
+}
+
+/**
+ * command to select text in shadow-root
+ */
+function selectText(element, start, end) {
+    getSelection().empty();
+    const actions = new test_driver.Actions();
+    actions.pointerMove(start, 0, {origin: element});
+    actions.pointerDown();
+    actions.pointerMove(end, 0, {origin: element});
+    actions.pointerUp();
+    return actions.send();
+}
+
+promise_test(async () => {
+    const xShadow = document.getElementById('withoutFocus');
+    buildShadowRootWithSelectableText(xShadow, false);
+
+    // starting selection from the center of the element, and going right.
+    // The important part here is that we start the selection in the center
+    //   (where mouse-down events may be delegated)
+    await selectText(xShadow, 0, 50)
+    const s = getSelection();
+
+    // because browsers may handle rendering differently, we can get different amounts of
+    //   text selected, even when using the same start-end values. We opt in this case to
+    //   verify just if any text is selected, since all we care about is if some text is
+    //   selected.
+    assert_greater_than(s.toString().length, 0);
+}, 'shadow root has selectable text when focus is not delegated');
+
+promise_test(async () => {
+    const xShadow = document.getElementById('withFocus');
+    buildShadowRootWithSelectableText(xShadow, true);
+
+    await selectText(xShadow, 0, 50)
+    const s = getSelection();
+
+    assert_greater_than(s.toString().length, 0);
+}, 'shadow root has selectable text when focus is delegated');
+
+</script>
diff --git a/tests/wpt/tests/shadow-dom/shadow-root-clonable.html b/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
index fa6a9d8df96..6272d11403f 100644
--- a/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
+++ b/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
@@ -3,6 +3,7 @@
 <link rel='author' href='mailto:krosylight@mozilla.com'>
 <link rel='author' href='mailto:masonf@chromium.org'>
 <link rel='help' href='https://dom.spec.whatwg.org/#shadowroot-clonable'>
+<link rel='help' href='https://github.com/whatwg/dom/issues/1249#issuecomment-1917772229'>
 <script src='/resources/testharness.js'></script>
 <script src='/resources/testharnessreport.js'></script>
 
@@ -11,14 +12,22 @@
 test(() => {
   const div = document.createElement("div");
   const root = div.attachShadow({ mode: "open", clonable: true });
-  root.appendChild(document.createElement("input"));
+  root.innerHTML = '<input><div><span></span></div>';
   assert_true(root.clonable, "clonable attribute");
 
   const clone = div.cloneNode(true);
   const clonedRoot = clone.shadowRoot;
   assert_true(clonedRoot.clonable, "clone gets the same clonable state");
-  assert_equals(clonedRoot.children.length, 1, "children count");
+  assert_equals(clonedRoot.children.length, 2, "children count");
   assert_equals(clonedRoot.children[0].localName, "input", "children content");
+  assert_equals(clonedRoot.children[1].firstElementChild.localName, "span", "grandchildren content");
+
+  const shallowClone = div.cloneNode(false);
+  const shallowClonedRoot = shallowClone.shadowRoot;
+  assert_true(shallowClonedRoot.clonable, "clone gets the same clonable state");
+  assert_equals(shallowClonedRoot.children.length, 2, "shallow clone still deep-clones the shadow root");
+  assert_equals(shallowClonedRoot.children[0].localName, "input", "shadow children content");
+  assert_equals(shallowClonedRoot.children[1].firstElementChild.localName, "span", "shadow grandchildren content");
 }, "attachShadow with clonable: true");
 
 for (const clonable of [false, undefined]) {
@@ -47,3 +56,22 @@ test(() => {
   assert_equals(clonedRoot.children[0].localName, "input", "children content");
 }, "declarative shadow roots get clonable: true automatically");
 </script>
+
+<template id="test">
+  <div id="host">
+    <template shadowrootmode=open><input></template>
+  </div>
+</template>
+
+<script>
+test(() => {
+  const template = document.querySelector('#test');
+  const root = template.content.querySelector('#host').shadowRoot;
+  assert_true(!!root);
+  const clone = template.content.cloneNode(true);
+  const clonedRoot = clone.querySelector('#host').shadowRoot;
+  assert_true(!!clonedRoot);
+  assert_equals(clonedRoot.children.length, 1, "children count");
+  assert_equals(clonedRoot.children[0].localName, "input", "children content");
+}, "declarative shadow roots inside templates also get cloned automatically");
+</script>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/softnav-painted-area-is-reset.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/softnav-painted-area-is-reset.tentative.html
deleted file mode 100644
index 0f5a1f42700..00000000000
--- a/tests/wpt/tests/soft-navigation-heuristics/softnav-painted-area-is-reset.tentative.html
+++ /dev/null
@@ -1,123 +0,0 @@
-<!DOCTYPE html>
-
-<head>
-  <meta charset="utf-8">
-  <title>Soft Navigation Painted Area Should Be Reset With A New Soft Navigation.</title>
-  <script src="/resources/testharness.js"></script>
-  <script src="/resources/testharnessreport.js"></script>
-  <script src="/resources/testdriver.js"></script>
-  <script src="/resources/testdriver-vendor.js"></script>
-  <script src="resources/soft-navigation-helper.js"></script>
-  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
-</head>
-
-<body>
-  <p id="initial_paint">
-    This is to make the initial painted area large so that the threshold for
-    soft navigations is large.
-  </p>
-  <a id=link1>Click</a>
-  <a id=link2>Click</a>
-  <script>
-    const link1 = document.getElementById("link1");
-    const link2 = document.getElementById("link2");
-
-    const waitForElementTimingWithId = (id) =>
-      new Promise(resolve => {
-        (new PerformanceObserver(list => {
-          if (list.getEntries().find(e => e.id.includes(id))) resolve();
-        })).observe({ type: 'element' });
-      });
-
-
-    const waitForLcpWithId = async (id, includeSoftNavLcp) => {
-      let options = {
-        type: 'largest-contentful-paint', buffered: true,
-      }
-      if (includeSoftNavLcp)
-        options.includeSoftNavigationObservations = true;
-
-      await new Promise(resolve => {
-        (new PerformanceObserver(list => {
-          if (list.getEntries().find(e => e.id.includes(id))) resolve();
-        })).observe(options);
-      });
-    }
-
-    const addTextWithStateChange = (id, size, text) => {
-      history.pushState({}, '', `foobar_${id}.html`);
-
-      const p = document.createElement("p");
-      const textNode = document.createTextNode(text);
-      p.appendChild(textNode);
-      p.setAttribute("elementtiming", 'element_timing');
-      p.id = id;
-      p.style = `font-size: ${size}em`;
-      document.body.appendChild(p);
-    }
-
-    const SoftNavPromise = () => {
-      return new Promise(resolve => {
-        new PerformanceObserver(list => {
-          resolve(list.getEntries());
-        }
-        ).observe({ type: 'soft-navigation' });
-      })
-    }
-
-    promise_test(async t => {
-      // Wait for page load.
-      await waitForLcpWithId('initial_paint', false);
-
-      link1.addEventListener('click', () => {
-        addTextWithStateChange('above_threshold', 4,
-          'THIS IS A LARGE TEXT SO THAT THE SOFT NAV PAINTED AREA IS ABOVE THRESHOLD.');
-      })
-
-      soft_nav_promise = SoftNavPromise();
-
-      waitForElementTimingPromise = waitForElementTimingWithId('above_threshold');
-
-      interact(link1);
-
-      await waitForElementTimingPromise;
-
-      await waitForLcpWithId('above_threshold', true);
-
-      let soft_nav_entries = await soft_nav_promise;
-
-      assert_equals(soft_nav_entries.length, 1, '1 soft nav entry should be emitted. ');
-
-      assert_true(soft_nav_entries[0].name.includes('above_threshold'),
-        'The soft nav entry name should include above_threshold.');
-
-      // Add a text that has a painted area under the threshold so that no soft
-      // navigaiton is emitted.
-      link2.addEventListener('click', () => {
-        addTextWithStateChange('under_threshold', 0.1, 'm');
-      })
-
-      waitForElementTimingPromise = waitForElementTimingWithId('under_threshold');
-
-      interact(link2);
-
-      await waitForElementTimingPromise;
-
-      soft_nav_entries = await new Promise((resolve) => {
-        (new PerformanceObserver((list) =>
-          resolve(list.getEntries()))).observe({
-            type: 'soft-navigation',
-            buffered: true
-          });
-        t.step_timeout(resolve, 1000);
-      });
-
-      assert_equals(soft_nav_entries.length, 1, 'No new soft navigation should emitted')
-      assert_true(soft_nav_entries[0].name.includes('above_threshold'),
-        'The soft nav entry should be the one previously seen.');
-
-
-    }, 'soft nav paitned area should be reset so that under threshold\
-      soft nav painted area would not trigger a soft navigation.')
-  </script>
-</body>
\ No newline at end of file
diff --git a/tests/wpt/tests/svg/text/reftests/green-100x100.svg b/tests/wpt/tests/svg/text/reftests/green-100x100.svg
new file mode 100644
index 00000000000..120941444a4
--- /dev/null
+++ b/tests/wpt/tests/svg/text/reftests/green-100x100.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <rect width="100" height="100" fill="green"/>
+</svg>
diff --git a/tests/wpt/tests/svg/text/reftests/lengthAdjust-vertical.svg b/tests/wpt/tests/svg/text/reftests/lengthAdjust-vertical.svg
new file mode 100644
index 00000000000..32ebd2ae384
--- /dev/null
+++ b/tests/wpt/tests/svg/text/reftests/lengthAdjust-vertical.svg
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <title>lengthAdjust="spacingAndGlyphs" should work on vertical text</title>
+    <h:link rel="help" href="https://www.w3.org/TR/SVG2/text.html#TextElementLengthAdjustAttribute"/>
+    <h:link rel="match" href="green-100x100.svg"/>
+    <h:link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+  </metadata>
+  <style>
+    text {
+      font: 25px/1 Ahem;
+    }
+  </style>
+  <rect fill="green" width="100" height="100"/>
+  <text x="50" y="10" fill="red" textLength="80" lengthAdjust="spacingAndGlyphs" font-family="Ahem" style="writing-mode: vertical-lr">
+    XX
+  </text>
+  <rect fill="green" x="37" y="9" width="26" height="82"/>
+</svg>
diff --git a/tests/wpt/tests/tools/ci/requirements_tc.txt b/tests/wpt/tests/tools/ci/requirements_tc.txt
index ce121e561f4..81516466054 100644
--- a/tests/wpt/tests/tools/ci/requirements_tc.txt
+++ b/tests/wpt/tests/tools/ci/requirements_tc.txt
@@ -1,4 +1,4 @@
-pygithub==2.1.1
+pygithub==2.2.0
 pyyaml==6.0.1
 requests==2.31.0
-taskcluster==59.2.0
+taskcluster==60.3.2
diff --git a/tests/wpt/tests/tools/requirements_tests.txt b/tests/wpt/tests/tools/requirements_tests.txt
index bd2cfe6c564..0604dceb0a0 100644
--- a/tests/wpt/tests/tools/requirements_tests.txt
+++ b/tests/wpt/tests/tools/requirements_tests.txt
@@ -2,5 +2,5 @@ httpx[http2]==0.24.1
 json-e==4.5.3
 jsonschema==4.17.3
 pyyaml==6.0.1
-taskcluster==59.2.0
+taskcluster==60.3.2
 mozterm==1.0.0
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
index 4669ec402e5..06f3d34f3f0 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
@@ -139,19 +139,17 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data,
     if kwargs["enable_experimental"]:
         chrome_options["args"].extend(["--enable-experimental-web-platform-features"])
 
-    new_headless_mode = ("--headless=new" in kwargs.get("binary_args", []))
-
-    # Pass the --headless flag to Chrome if WPT's own --headless flag was set
-    # or if we're running print reftests because of crbug.com/753118
-    if ((kwargs["headless"] or test_type == "print-reftest") and
-        "--headless" not in chrome_options["args"] and not new_headless_mode):
-        chrome_options["args"].append("--headless")
-
     # Copy over any other flags that were passed in via `--binary-arg`
     for arg in kwargs.get("binary_args", []):
         if arg not in chrome_options["args"]:
             chrome_options["args"].append(arg)
 
+    # Pass the --headless=new flag to Chrome if WPT's own --headless flag was
+    # set. '--headless' should always mean the new headless mode, as the old
+    # headless mode is not used anyway.
+    if kwargs["headless"] and "--headless=new" not in chrome_options["args"]:
+        chrome_options["args"].append("--headless=new")
+
     if test_type == "wdspec":
         executor_kwargs["binary_args"] = chrome_options["args"]
 
diff --git a/tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.html b/tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html
similarity index 100%
rename from tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.html
rename to tests/wpt/tests/trusted-types/TrustedTypePolicyFactory-blocking.tentative.html
diff --git a/tests/wpt/tests/trusted-types/block-string-assignment-to-Document-parseHTMLUnsafe.html b/tests/wpt/tests/trusted-types/block-string-assignment-to-Document-parseHTMLUnsafe.html
new file mode 100644
index 00000000000..83dfcda5d92
--- /dev/null
+++ b/tests/wpt/tests/trusted-types/block-string-assignment-to-Document-parseHTMLUnsafe.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta name="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="support/helper.sub.js"></script>
+
+  <meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">
+</head>
+<body>
+<script>
+  test(t => {
+    let p = createHTML_policy(window, 1);
+    let html = p.createHTML(INPUTS.HTML);
+    let doc = Document.parseHTMLUnsafe(html);
+    assert_equals(doc.body.innerText, RESULTS.HTML);
+  }, "Document.parseHTMLUnsafe assigned via policy (successful HTML transformation).");
+
+  // String assignments throw.
+  test(t => {
+    assert_throws_js(TypeError, _ => {
+      var doc = Document.parseHTMLUnsafe("Fail");
+    });
+  }, "`Document.parseHTMLUnsafe(string)` throws.");
+
+  // Null assignment throws.
+  test(t => {
+    assert_throws_js(TypeError, _ => {
+      var doc = Document.parseHTMLUnsafe(null);
+    });
+  }, "'Document.parseHTMLUnsafe(null)' throws");
+
+  // After default policy creation string assignment implicitly calls createHTML.
+  test(t => {
+    let p = window.trustedTypes.createPolicy("default", { createHTML: createHTMLJS }, true);
+    let doc = Document.parseHTMLUnsafe(INPUTS.HTML, "text/html");
+    assert_equals(doc.body.innerText, RESULTS.HTML);
+  }, "'Document.parseHTMLUnsafe(string)' assigned via default policy (successful HTML transformation).");
+
+  // After default policy creation null assignment implicitly calls createHTML.
+  test(t => {
+    var doc = Document.parseHTMLUnsafe(null, "text/html");
+    assert_equals(doc.body.innerText, "null");
+  }, "'Document.parseHTMLUnsafe(null)' assigned via default policy does not throw");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/trusted-types/block-string-assignment-to-Element-setHTMLUnsafe.html b/tests/wpt/tests/trusted-types/block-string-assignment-to-Element-setHTMLUnsafe.html
new file mode 100644
index 00000000000..34975f9d688
--- /dev/null
+++ b/tests/wpt/tests/trusted-types/block-string-assignment-to-Element-setHTMLUnsafe.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta name="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="support/helper.sub.js"></script>
+
+  <meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">
+</head>
+<body>
+<div id="container"></div>
+<script>
+  var container = document.querySelector('#container')
+
+  // TrustedHTML assignments do not throw.
+  test(t => {
+    let p = createHTML_policy(window, 1);
+    let html = p.createHTML(INPUTS.HTML);
+
+    var d = document.createElement('div');
+    document.querySelector('#container').appendChild(d);
+    d.setHTMLUnsafe(html);
+    assert_equals(container.innerText, RESULTS.HTML);
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "element.setHTMLUnsafe(html) assigned via policy (successful HTML transformation).");
+
+  // String assignments throw.
+  test(t => {
+    var d = document.createElement('div');
+    container.appendChild(d);
+    assert_throws_js(TypeError, _ => {
+      d.setHTMLUnsafe("Fail");
+    });
+    assert_equals(container.innerText, "");
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`element.setHTMLUnsafe(string)` throws.");
+
+  // Null assignment throws.
+  test(t => {
+    var d = document.createElement('div');
+    container.appendChild(d);
+    assert_throws_js(TypeError, _ => {
+      d.outerHTML = null;
+    });
+    assert_equals(container.innerText, "");
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`element.setHTMLUnsafe(null)` throws.");
+
+  // After default policy creation string assignment implicitly calls createHTML.
+  test(t => {
+    let p = window.trustedTypes.createPolicy("default", { createHTML: createHTMLJS }, true);
+
+    var d = document.createElement('div');
+    document.querySelector('#container').appendChild(d);
+    d.setHTMLUnsafe(INPUTS.HTML);
+    assert_equals(container.innerText, RESULTS.HTML);
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`element.setHTMLUnsafe(string)` assigned via default policy (successful HTML transformation).");
+
+  // After default policy creation null assignment implicitly calls createHTML.
+  test(t => {
+    var d = document.createElement('div');
+    container.appendChild(d);
+    d.setHTMLUnsafe(null);
+    assert_equals(container.innerText, "null");
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`element.setHTMLUnsafe(string)` assigned via default policy does not throw");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/trusted-types/block-string-assignment-to-ShadowRoot-setHTMLUnsafe.html b/tests/wpt/tests/trusted-types/block-string-assignment-to-ShadowRoot-setHTMLUnsafe.html
new file mode 100644
index 00000000000..a76543b3f68
--- /dev/null
+++ b/tests/wpt/tests/trusted-types/block-string-assignment-to-ShadowRoot-setHTMLUnsafe.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta name="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="support/helper.sub.js"></script>
+
+  <meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">
+</head>
+<body>
+<div id="container"></div>
+<script>
+  var container = document.querySelector('#container')
+
+  // TrustedHTML assignments do not throw.
+  test(t => {
+    let p = createHTML_policy(window, 1);
+    let html = p.createHTML(INPUTS.HTML);
+
+    let d = document.createElement('div');
+    let s = d.attachShadow({mode: 'open'});
+    document.querySelector('#container').appendChild(d);
+    s.setHTMLUnsafe(html);
+    assert_equals(s.innerHTML, RESULTS.HTML);
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "shadowRoot.setHTMLUnsafe(html) assigned via policy (successful HTML transformation).");
+
+  // String assignments throw.
+  test(t => {
+    let d = document.createElement('div');
+    let s = d.attachShadow({mode: 'open'});
+    container.appendChild(d);
+    assert_throws_js(TypeError, _ => {
+      s.setHTMLUnsafe("Fail");
+    });
+    assert_equals(s.innerHTML, "");
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`shadowRoot.setHTMLUnsafe(string)` throws.");
+
+  // Null assignment throws.
+  test(t => {
+    let d = document.createElement('div');
+    let s = d.attachShadow({mode: 'open'});
+    container.appendChild(d);
+    assert_throws_js(TypeError, _ => {
+      s.setHTMLUnsafe(null);
+    });
+    assert_equals(s.innerHTML, "");
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`shadowRoot.setHTMLUnsafe(null)` throws.");
+
+  // After default policy creation string assignment implicitly calls createHTML.
+  test(t => {
+    let p = window.trustedTypes.createPolicy("default", { createHTML: createHTMLJS }, true);
+
+    let d = document.createElement('div');
+    let s = d.attachShadow({mode: 'open'});
+    document.querySelector('#container').appendChild(d);
+    s.setHTMLUnsafe(INPUTS.HTML);
+    assert_equals(s.innerHTML, RESULTS.HTML);
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`shadowRoot.setHTMLUnsafe(string)` assigned via default policy (successful HTML transformation).");
+
+  // After default policy creation null assignment implicitly calls createHTML.
+  test(t => {
+    let d = document.createElement('div');
+    let s = d.attachShadow({mode: 'open'});
+    container.appendChild(d);
+    s.setHTMLUnsafe(null);
+    assert_equals(s.innerHTML, "null");
+
+    while (container.firstChild)
+      container.firstChild.remove();
+  }, "`shadowRoot.setHTMLUnsafe(string)` assigned via default policy does not throw");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/uievents/mouse/mouse_boundary_events_after_removing_last_over_element.html b/tests/wpt/tests/uievents/mouse/mouse_boundary_events_after_removing_last_over_element.html
new file mode 100644
index 00000000000..817c5d9ecc8
--- /dev/null
+++ b/tests/wpt/tests/uievents/mouse/mouse_boundary_events_after_removing_last_over_element.html
@@ -0,0 +1,153 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Redundant "mouseenter" shouldn't be fired without "mouseleave"s</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-actions.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script>
+"use strict";
+
+function stringifyEvents(eventArray) {
+  if (!eventArray.length) {
+    return "[]";
+  }
+  let result = "";
+  eventArray.forEach(event => {
+    if (result != "") {
+      result += ", ";
+    }
+    result += `${event.type}@${
+      event.target?.nodeType == Node.ELEMENT_NODE
+        ? `${event.target.localName}${
+            event.target.id ? `#${event.target.id}` : ""
+          }`
+        : event.target?.localName
+    }`;
+  });
+  return result;
+}
+
+function eventsAfterClick(eventArray) {
+  const indexAtClick = eventArray.findIndex(e => e.type == "click");
+  if (indexAtClick >= 0) {
+    return eventArray.slice(indexAtClick + 1);
+  }
+  return [];
+}
+
+addEventListener("load", () => {
+  promise_test(async () => {
+    const div1 = document.createElement("div");
+    div1.setAttribute("id", "grandparent");
+    div1.setAttribute("style", "width: 32px; height: 32px");
+    const div2 = document.createElement("div");
+    div2.setAttribute("id", "parent");
+    div2.setAttribute("style", "width: 32px; height: 32px");
+    const div3 = document.createElement("div");
+    div3.setAttribute("id", "child");
+    div3.setAttribute("style", "width: 32px; height: 32px");
+    div1.appendChild(div2);
+    div2.appendChild(div3);
+    document.body.appendChild(div1);
+    const bodyRect = document.body.getBoundingClientRect();
+    const div3Rect = div3.getBoundingClientRect();
+    let events = [];
+    for (const type of ["mouseenter", "mouseleave", "mouseover", "mouseout", "mousemove"]) {
+      for (const node of [document.body, div1, div2, div3]) {
+        node.addEventListener(type, event => {
+          if (event.target == node) {
+            events.push({type: event.type, target: event.target});
+          }
+        }, {capture: true});
+      }
+    }
+    div3.addEventListener("click", event => {
+      div3.remove();
+      events.push({type: event.type, target: event.target});
+    }, {once: true});
+    await new test_driver.Actions()
+      .pointerMove(div3Rect.x + 10, div3Rect.y + 10, {})
+      .pointerDown()
+      .pointerUp() // The clicked in the child, then it's removed from the DOM tree
+      .pointerMove(bodyRect.x + 10, bodyRect.y + 10, {}) // Then, move onto the <body>
+      .send();
+    // FYI: Comparing `mouseenter`s before `click` requires additional
+    // initialization, but it's out of scope of this bug.  Therefore, we
+    // compare only events after `click`.
+    const expectedEvents = [ // no events should be fired on the child due to disconnected
+      { type: "mouseover", target: div2 }, // mouseover should be fired because of the mutation
+      { type: "mouseout", target: div2}, // mouseout should be fired because of the mutation
+      { type: "mouseleave", target: div2},
+      { type: "mouseleave", target: div1},
+      { type: "mouseover", target: document.body},
+      { type: "mousemove", target: document.body},
+    ];
+    assert_equals(
+      stringifyEvents(eventsAfterClick(events)),
+      stringifyEvents(expectedEvents),
+    );
+    div1.remove();
+  }, "After removing the last over element, redundant mouseenter events should not be fired on the ancestors");
+
+  promise_test(async () => {
+    const hostContainer = document.createElement("div");
+    hostContainer.setAttribute("id", "containerOfShadowHost");
+    hostContainer.setAttribute("style", "margin-top: 32px; height: 32px");
+    const host = document.createElement("div");
+    host.setAttribute("id", "shadowHost");
+    host.setAttribute("style", "width: 32px; height: 32px");
+    const root = host.attachShadow({mode: "open"});
+    const rootElementInShadow = document.createElement("div");
+    root.appendChild(rootElementInShadow);
+    rootElementInShadow.setAttribute("id", "divInShadow");
+    rootElementInShadow.setAttribute("style", "width: 32px; height: 32px");
+    hostContainer.appendChild(host);
+    document.body.appendChild(hostContainer);
+    const bodyRect = document.body.getBoundingClientRect();
+    const rootElementInShadowRect = rootElementInShadow.getBoundingClientRect();
+    let events = [];
+    for (const type of ["mouseenter", "mouseleave", "mouseover", "mouseout", "mousemove"]) {
+      for (const node of [document.body, hostContainer, host, root, rootElementInShadow]) {
+        node.addEventListener(type, event => {
+          if (event.target == node) {
+            events.push({type: event.type, target: event.target});
+          }
+        }, {capture: true});
+      }
+    }
+    rootElementInShadow.addEventListener("click", event => {
+      rootElementInShadow.remove();
+      events.push({type: event.type, target: event.target});
+    }, {once: true});
+    await new test_driver.Actions()
+      .pointerMove(rootElementInShadowRect.x + 10, rootElementInShadowRect.y + 10, {})
+      .pointerDown()
+      .pointerUp() // The clicked root element in the shadow is removed here.
+      .pointerMove(bodyRect.x + 10, bodyRect.y + 10, {}) // Then, move onto the <body>
+      .send();
+    // FYI: Comparing `mouseenter`s before `click` requires additional
+    // initialization, but it's out of scope of this bug.  Therefore, we
+    // compare only events after `click`.
+    const expectedEvents = [ // no events should be fired on rootElementInShadow due to disconnected
+      { type: "mouseover", target: host}, // mouseover should be fired because of the mutation
+      { type: "mouseout", target: host}, // mouseout should be fired because of the mutation
+      { type: "mouseleave", target: host},
+      { type: "mouseleave", target: hostContainer},
+      { type: "mouseover", target: document.body},
+      { type: "mousemove", target: document.body},
+    ];
+    assert_equals(
+      stringifyEvents(eventsAfterClick(events)),
+      stringifyEvents(expectedEvents),
+    );
+    hostContainer.remove();
+  }, "After removing the root element in the shadow under the cursor, mouseleave events should be targeted outside the shadow, but redundant mouseenter events should not be fired");
+}, {once: true});
+</script>
+</head>
+<body style="padding-top: 32px"></body>
+</html>
diff --git a/tests/wpt/tests/wai-aria/scripts/aria-utils.js b/tests/wpt/tests/wai-aria/scripts/aria-utils.js
index a281bec1783..ec53464c18f 100644
--- a/tests/wpt/tests/wai-aria/scripts/aria-utils.js
+++ b/tests/wpt/tests/wai-aria/scripts/aria-utils.js
@@ -38,7 +38,7 @@ const AriaUtils = {
       AriaUtils.verifyRolesBySelector(".ex")
 
   */
-  verifyRolesBySelector: function(selector) {
+  verifyRolesBySelector: function(selector, roleTestNamePrefix) {
     const els = document.querySelectorAll(selector);
     if (!els.length) {
       throw `Selector passed in verifyRolesBySelector("${selector}") should match at least one element.`;
@@ -46,6 +46,9 @@ const AriaUtils = {
     for (const el of els) {
       let role = el.getAttribute("data-expectedrole");
       let testName = el.getAttribute("data-testname") || role; // data-testname optional if role is unique per test file
+      if (typeof roleTestNamePrefix !== "undefined") {
+        testName = roleTestNamePrefix + testName;
+      }
       promise_test(async t => {
         const expectedRole = el.getAttribute("data-expectedrole");
         const computedRole = await test_driver.get_computed_role(el);
@@ -127,7 +130,7 @@ const AriaUtils = {
       AriaUtils.verifyLabelsBySelector(".ex")
 
   */
-  verifyLabelsBySelector: function(selector) {
+  verifyLabelsBySelector: function(selector, labelTestNamePrefix) {
     const els = document.querySelectorAll(selector);
     if (!els.length) {
       throw `Selector passed in verifyLabelsBySelector("${selector}") should match at least one element.`;
@@ -135,9 +138,13 @@ const AriaUtils = {
     for (const el of els) {
       let label = el.getAttribute("data-expectedlabel");
       let testName = el.getAttribute("data-testname") || label; // data-testname optional if label is unique per test file
+      if (typeof labelTestNamePrefix !== "undefined") {
+        testName = labelTestNamePrefix + testName;
+      }
       promise_test(async t => {
         const expectedLabel = el.getAttribute("data-expectedlabel");
         let computedLabel = await test_driver.get_computed_label(el);
+        assert_not_equals(computedLabel, null, `get_computed_label(el) shouldn't return null for ${el.outerHTML}`);
 
         // See:
         // - https://github.com/w3c/accname/pull/165
@@ -157,5 +164,33 @@ const AriaUtils = {
   },
 
 
+  /*
+  Tests computed LABEL and ROLE of all elements matching selector using existing
+    verifyLabelsBySelector(), verifyRolesBySelector() functions and passes a test name prefix
+    to ensure uniqueness.
+
+  Ex: <div aria-label="foo" role="button"
+        data-testname="div with role=button is labelled via aria-label"
+        data-expectedlabel="foo"
+        data-expectedrole="button"
+        class="ex-role-and-label">
+
+      AriaUtils.verifyRolesAndLabelsBySelector(".ex-role-and-label")
+
+  */
+  verifyRolesAndLabelsBySelector: function(selector) {
+    let labelTestNamePrefix = "Label: ";
+    let roleTestNamePrefix = "Role: ";
+    const els = document.querySelectorAll(selector);
+    if (!els.length) {
+      throw `Selector passed in verifyRolesAndLabelsBySelector("${selector}") should match at least one element.`;
+    }
+    for (const el of els) {
+      el.classList.add("ex-label-only");
+      el.classList.add("ex-role-only");
+    }
+    this.verifyLabelsBySelector(".ex-label-only", labelTestNamePrefix);
+    this.verifyRolesBySelector(".ex-role-only", roleTestNamePrefix);
+  },
 };
 
diff --git a/tests/wpt/tests/webcodecs/full-cycle-test.https.any.js b/tests/wpt/tests/webcodecs/full-cycle-test.https.any.js
index fc9c2e19fd2..8e1ae65bdca 100644
--- a/tests/wpt/tests/webcodecs/full-cycle-test.https.any.js
+++ b/tests/wpt/tests/webcodecs/full-cycle-test.https.any.js
@@ -2,6 +2,7 @@
 // META: global=window,dedicatedworker
 // META: script=/webcodecs/video-encoder-utils.js
 // META: variant=?av1
+// META: variant=?av1_444_high
 // META: variant=?vp8
 // META: variant=?vp9_p0
 // META: variant=?vp9_p2
@@ -20,6 +21,12 @@ promise_setup(async () => {
       hasEmbeddedColorSpace: true,
       hardwareAcceleration: 'prefer-software',
     },
+    '?av1_444_high': {
+      codec: 'av01.1.04M.08.0.000',
+      hasEmbeddedColorSpace: true,
+      hardwareAcceleration: 'prefer-software',
+      outputPixelFormat: 'I444',
+    },
     '?vp8': {
       codec: 'vp8',
       hasEmbeddedColorSpace: false,
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/browser/__init__.py
index b9cb10f2c72..e1327d55c90 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browser/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/__init__.py
@@ -1,6 +1,35 @@
+from webdriver.bidi.modules.script import ContextTarget
+
 async def get_user_context_ids(bidi_session):
     """
     Returns the list of string ids of the current user contexts.
     """
     user_contexts = await bidi_session.browser.get_user_contexts()
     return [user_context_info["userContext"] for user_context_info in user_contexts]
+
+
+async def set_local_storage(bidi_session, context: str, key: str, value: str):
+    """
+    Sets the value for the key in the context's localStorage.
+    """
+    await bidi_session.script.call_function(
+        function_declaration="""(key, value) => localStorage.setItem(key, value)""",
+        arguments=[{"type": "string", "value": key}, {"type": "string", "value": value}],
+        await_promise=False,
+        target=ContextTarget(context["context"]),
+    )
+
+
+async def get_local_storage(bidi_session, context: str, key: str):
+    """
+    Returns the value identified by the key from the context's localStorage.
+    """
+    result = await bidi_session.script.call_function(
+        function_declaration="""(key) => localStorage.getItem(key)""",
+        arguments=[{"type": "string", "value": key}],
+        await_promise=False,
+        target=ContextTarget(context["context"]),
+    )
+    if not "value" in result:
+        return None
+    return result["value"]
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/create_user_context/create_user_context.py b/tests/wpt/tests/webdriver/tests/bidi/browser/create_user_context/create_user_context.py
index d62be414605..f495498d072 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browser/create_user_context/create_user_context.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/create_user_context/create_user_context.py
@@ -1,6 +1,7 @@
 import pytest
 
 from .. import get_user_context_ids
+from .. import get_local_storage, set_local_storage
 
 
 @pytest.mark.asyncio
@@ -23,3 +24,37 @@ async def test_unique_id(bidi_session, create_user_context):
     assert other_context in await get_user_context_ids(bidi_session)
 
     assert first_context != other_context
+
+
+@pytest.mark.asyncio
+async def test_storage_isolation(bidi_session, create_user_context, inline):
+    first_context = await create_user_context()
+    other_context = await create_user_context()
+
+    test_key = "test"
+
+    tab_first_context = await bidi_session.browsing_context.create(
+        type_hint="tab",
+        user_context=first_context
+    )
+
+    await bidi_session.browsing_context.navigate(context=tab_first_context["context"],
+                                              url=inline("test"),
+                                              wait="complete")
+
+    tab_other_context = await bidi_session.browsing_context.create(
+        type_hint="tab",
+        user_context=other_context
+    )
+
+    await bidi_session.browsing_context.navigate(context=tab_other_context["context"],
+                                          url=inline("test"),
+                                          wait="complete")
+
+    assert await get_local_storage(bidi_session, tab_first_context, test_key) == None
+    assert await get_local_storage(bidi_session, tab_other_context, test_key) == None
+
+    await set_local_storage(bidi_session, tab_first_context, test_key, "value")
+
+    assert await get_local_storage(bidi_session, tab_first_context, test_key) == "value"
+    assert await get_local_storage(bidi_session, tab_other_context, test_key) == None
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_created/context_created.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_created/context_created.py
index 9b0926c0975..dda9b2dae0e 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_created/context_created.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_created/context_created.py
@@ -45,6 +45,7 @@ async def test_new_context(bidi_session, wait_for_event, wait_for_future_safe, s
         children=None,
         url="about:blank",
         parent=None,
+        user_context="default"
     )
 
 
@@ -221,3 +222,34 @@ async def test_subscribe_to_one_context(
     assert len(events) == 1
 
     remove_listener()
+
+
+async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_safe, subscribe_events, create_user_context):
+    events = []
+
+    async def on_event(method, data):
+        events.append(data)
+
+    remove_listener = bidi_session.add_event_listener(CONTEXT_CREATED_EVENT, on_event)
+
+    await subscribe_events([CONTEXT_CREATED_EVENT])
+
+    user_context = await create_user_context()
+    assert len(events) == 0
+
+    on_entry = wait_for_event(CONTEXT_CREATED_EVENT)
+    context = await bidi_session.browsing_context.create(type_hint="tab", user_context=user_context)
+    context_info = await wait_for_future_safe(on_entry)
+
+    assert len(events) == 1
+
+    assert_browsing_context(
+        context_info,
+        context["context"],
+        children=None,
+        url="about:blank",
+        parent=None,
+        user_context=user_context
+    )
+
+    remove_listener()
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_destroyed/context_destroyed.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_destroyed/context_destroyed.py
index 0dad8bc21d4..1e918713779 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_destroyed/context_destroyed.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/context_destroyed/context_destroyed.py
@@ -48,6 +48,7 @@ async def test_new_context(bidi_session, wait_for_event, wait_for_future_safe, s
         children=None,
         url="about:blank",
         parent=None,
+        user_context="default"
     )
 
 
@@ -246,3 +247,36 @@ async def test_subscribe_to_one_context(bidi_session, subscribe_events, new_tab)
     assert len(events) == 1
 
     remove_listener()
+
+
+async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_safe, subscribe_events, create_user_context):
+    events = []
+
+    async def on_event(method, data):
+        events.append(data)
+
+    remove_listener = bidi_session.add_event_listener(CONTEXT_DESTROYED_EVENT, on_event)
+
+    await subscribe_events([CONTEXT_DESTROYED_EVENT])
+
+    user_context = await create_user_context()
+    assert len(events) == 0
+
+    context = await bidi_session.browsing_context.create(type_hint="tab", user_context=user_context)
+    assert len(events) == 0
+
+    on_entry = wait_for_event(CONTEXT_DESTROYED_EVENT)
+    await bidi_session.browsing_context.close(context=context["context"])
+    context_info = await wait_for_future_safe(on_entry)
+    assert len(events) == 1
+
+    assert_browsing_context(
+        context_info,
+        context["context"],
+        children=None,
+        url="about:blank",
+        parent=None,
+        user_context=user_context
+    )
+
+    remove_listener()
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/get_tree/frames.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/get_tree/frames.py
index b1936d31d0b..fae7f00a05c 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/get_tree/frames.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/get_tree/frames.py
@@ -88,3 +88,60 @@ async def test_cross_origin(
         url=test_page_cross_origin,
     )
     assert child1_info["context"] != root_info["context"]
+
+
+@pytest.mark.parametrize("user_context", ["default", "new"])
+async def test_user_context(
+    bidi_session,
+    create_user_context,
+    test_page,
+    test_page2,
+    test_page_multiple_frames,
+    user_context
+):
+    user_context_id = await create_user_context() if user_context == "new" else user_context
+
+    context = await bidi_session.browsing_context.create(type_hint="tab", user_context=user_context_id)
+
+    await bidi_session.browsing_context.navigate(
+        context=context["context"], url=test_page_multiple_frames, wait="complete"
+    )
+
+    top_level_context_id = context["context"]
+    all_contexts = await bidi_session.browsing_context.get_tree(root=top_level_context_id)
+
+    assert len(all_contexts) == 1
+    root_info = all_contexts[0]
+    assert_browsing_context(
+        root_info,
+        top_level_context_id,
+        children=2,
+        parent=None,
+        url=test_page_multiple_frames,
+        user_context=user_context_id,
+    )
+
+    child1_info = root_info["children"][0]
+    assert_browsing_context(
+        child1_info,
+        context=None,
+        children=0,
+        is_root=False,
+        parent=None,
+        url=test_page,
+        user_context=user_context_id,
+    )
+    assert child1_info["context"] != root_info["context"]
+
+    child2_info = root_info["children"][1]
+    assert_browsing_context(
+        child2_info,
+        context=None,
+        children=0,
+        is_root=False,
+        parent=None,
+        url=test_page2,
+        user_context=user_context_id,
+    )
+    assert child2_info["context"] != root_info["context"]
+    assert child2_info["context"] != child1_info["context"]
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/__init__.py
index 12278315491..e69de29bb2d 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/__init__.py
@@ -1,4 +0,0 @@
-async def get_url_for_context(bidi_session, context):
-    contexts = await bidi_session.browsing_context.get_tree(root=context)
-
-    return contexts[0]["url"]
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/conftest.py
new file mode 100644
index 00000000000..fcd7cdf1142
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/conftest.py
@@ -0,0 +1,38 @@
+import pytest_asyncio
+
+from tests.support.sync import AsyncPoll
+
+# Temporary fixtures until traverse history is fully implemented and will await the navigation.
+# See: https://github.com/w3c/webdriver-bidi/issues/94
+
+
+@pytest_asyncio.fixture
+async def wait_for_url(bidi_session, current_url):
+    async def wait_for_url(context, target_url, timeout=2):
+        async def check_url(_):
+            return await current_url(context) == target_url
+
+        wait = AsyncPoll(
+            bidi_session,
+            timeout=timeout,
+            message="Expected URL did not load"
+        )
+        await wait.until(check_url)
+
+    return wait_for_url
+
+
+@pytest_asyncio.fixture
+async def wait_for_not_url(bidi_session, current_url):
+    async def wait_for_not_url(context, target_url, timeout=2):
+        async def check_url(_):
+            return await current_url(context) != target_url
+
+        wait = AsyncPoll(
+            bidi_session,
+            timeout=timeout,
+            message="Expected URL is still loaded"
+        )
+        await wait.until(check_url)
+
+    return wait_for_not_url
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/context.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/context.py
index 7635c0e9ddd..2635dcfa287 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/context.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/context.py
@@ -2,18 +2,13 @@ import pytest
 
 import webdriver.bidi.error as error
 
-from . import get_url_for_context
-
 
 pytestmark = pytest.mark.asyncio
 
 
-async def test_params_context_invalid_value(bidi_session):
-    with pytest.raises(error.NoSuchFrameException):
-        await bidi_session.browsing_context.traverse_history(context="foo", delta=1)
-
-
-async def test_top_level_contexts(bidi_session, top_context, new_tab, inline):
+async def test_top_level_contexts(
+    bidi_session, current_url, wait_for_url, top_context, new_tab, inline
+):
     pages = [
         inline("<div>page 1</div>"),
         inline("<div>page 2</div>"),
@@ -23,25 +18,25 @@ async def test_top_level_contexts(bidi_session, top_context, new_tab, inline):
             await bidi_session.browsing_context.navigate(
                 context=context, url=page, wait="complete"
             )
-            assert await get_url_for_context(bidi_session, context) == page
+            assert await current_url(context) == page
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=-1
     )
 
-    assert await get_url_for_context(bidi_session, top_context["context"]) == pages[1]
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[0]
+    await wait_for_url(top_context["context"], pages[1])
+    await wait_for_url(new_tab["context"], pages[0])
 
 
 @pytest.mark.parametrize("domain", ["", "alt"], ids=["same_origin", "cross_origin"])
-async def test_iframe(bidi_session, new_tab, inline, domain):
+async def test_iframe(bidi_session, current_url, wait_for_url, new_tab, inline, domain):
     iframe_url_1 = inline("page 1")
     page_url = inline(f"<iframe src='{iframe_url_1}'></iframe>", domain=domain)
 
     await bidi_session.browsing_context.navigate(
         context=new_tab["context"], url=page_url, wait="complete"
     )
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page_url
+    assert await current_url(new_tab["context"]) == page_url
 
     contexts = await bidi_session.browsing_context.get_tree(root=new_tab["context"])
     iframe_context = contexts[0]["children"][0]
@@ -50,17 +45,11 @@ async def test_iframe(bidi_session, new_tab, inline, domain):
     await bidi_session.browsing_context.navigate(
         context=iframe_context["context"], url=iframe_url_2, wait="complete"
     )
-    assert (
-        await get_url_for_context(bidi_session, iframe_context["context"])
-        == iframe_url_2
-    )
+    assert await current_url(iframe_context["context"]) == iframe_url_2
 
     await bidi_session.browsing_context.traverse_history(
         context=iframe_context["context"], delta=-1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page_url
-    assert (
-        await get_url_for_context(bidi_session, iframe_context["context"])
-        == iframe_url_1
-    )
+    await wait_for_url(new_tab["context"], page_url)
+    await wait_for_url(iframe_context["context"], iframe_url_1)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/delta.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/delta.py
index 05f4d99544f..3bd0087250c 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/delta.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/delta.py
@@ -1,46 +1,18 @@
 from pathlib import Path
 
 import pytest
-
-import webdriver.bidi.error as error
+from webdriver import error
 from webdriver.bidi.modules.script import ContextTarget
 
-from . import get_url_for_context
+from tests.support.sync import AsyncPoll
 
 
 pytestmark = pytest.mark.asyncio
 
 
-@pytest.mark.parametrize("value", [-2, 1])
-async def test_delta_invalid_value(bidi_session, new_tab, inline, value):
-    page = inline("<div>page 1</div>")
-    await bidi_session.browsing_context.navigate(
-        context=new_tab["context"], url=page, wait="complete"
-    )
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page
-
-    with pytest.raises(error.NoSuchHistoryEntryException):
-        await bidi_session.browsing_context.traverse_history(
-            context=new_tab["context"], delta=value
-        )
-
-
-async def test_delta_0(bidi_session, new_tab, inline):
-    page = inline("<div>page 1</div>")
-    await bidi_session.browsing_context.navigate(
-        context=new_tab["context"], url=page, wait="complete"
-    )
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page
-
-    await bidi_session.browsing_context.traverse_history(
-        context=new_tab["context"], delta=0
-    )
-
-    # Check that url didn't change
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page
-
-
-async def test_delta_forward_and_back(bidi_session, new_tab, inline):
+async def test_delta_0(
+    bidi_session, current_url, wait_for_url, wait_for_not_url, new_tab, inline
+):
     pages = [
         inline("<div>page 1</div>"),
         inline("<div>page 2</div>"),
@@ -50,22 +22,51 @@ async def test_delta_forward_and_back(bidi_session, new_tab, inline):
         await bidi_session.browsing_context.navigate(
             context=new_tab["context"], url=page, wait="complete"
         )
-        assert await get_url_for_context(bidi_session, new_tab["context"]) == page
+        assert await current_url(new_tab["context"]) == page
+
+    await bidi_session.browsing_context.traverse_history(
+        context=new_tab["context"], delta=-1
+    )
+    await wait_for_url(new_tab["context"], pages[1])
+
+    # With delta 0 no navigation has to happen
+    await bidi_session.browsing_context.traverse_history(
+        context=new_tab["context"], delta=0
+    )
+    with pytest.raises(error.TimeoutException):
+        await wait_for_not_url(new_tab["context"], pages[1])
+
+
+async def test_delta_forward_and_back(
+    bidi_session, current_url, wait_for_url, new_tab, inline
+):
+    pages = [
+        inline("<div>page 1</div>"),
+        inline("<div>page 2</div>"),
+        inline("<div>page 3</div>"),
+    ]
+    for page in pages:
+        await bidi_session.browsing_context.navigate(
+            context=new_tab["context"], url=page, wait="complete"
+        )
+        assert await current_url(new_tab["context"]) == page
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=-2
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[0]
+    await wait_for_url(new_tab["context"], pages[0])
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=2
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[2]
+    await wait_for_url(new_tab["context"], pages[2])
 
 
-async def test_navigate_in_the_same_document(bidi_session, new_tab, url):
+async def test_navigate_in_the_same_document(
+    bidi_session, current_url, wait_for_url, new_tab, url
+):
     page_url = "/webdriver/tests/bidi/browsing_context/support/empty.html"
     pages = [
         url(page_url),
@@ -76,27 +77,29 @@ async def test_navigate_in_the_same_document(bidi_session, new_tab, url):
         await bidi_session.browsing_context.navigate(
             context=new_tab["context"], url=page, wait="complete"
         )
-        assert await get_url_for_context(bidi_session, new_tab["context"]) == page
+        assert await current_url(new_tab["context"]) == page
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=-1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[1]
+    await wait_for_url(new_tab["context"], pages[1])
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[2]
+    await wait_for_url(new_tab["context"], pages[2])
 
 
-async def test_history_push_state(bidi_session, new_tab, url):
+async def test_history_push_state(
+    bidi_session, current_url, wait_for_url, new_tab, url
+):
     page_url = url("/webdriver/tests/bidi/browsing_context/support/empty.html")
     await bidi_session.browsing_context.navigate(
         context=new_tab["context"], url=page_url, wait="complete"
     )
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page_url
+    assert await current_url(new_tab["context"]) == page_url
 
     pages = [
         f"{page_url}#foo",
@@ -113,19 +116,19 @@ async def test_history_push_state(bidi_session, new_tab, url):
             await_promise=False,
             target=ContextTarget(new_tab["context"]),
         )
-        assert await get_url_for_context(bidi_session, new_tab["context"]) == page
+        await wait_for_url(new_tab["context"], page)
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=-1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[0]
+    await wait_for_url(new_tab["context"], pages[0])
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[1]
+    await wait_for_url(new_tab["context"], pages[1])
 
 
 @pytest.mark.parametrize(
@@ -142,21 +145,23 @@ async def test_history_push_state(bidi_session, new_tab, url):
         "file url",
     ],
 )
-async def test_navigate_special_protocols(bidi_session, new_tab, pages):
+async def test_navigate_special_protocols(
+    bidi_session, current_url, wait_for_url, new_tab, pages
+):
     for page in pages:
         await bidi_session.browsing_context.navigate(
             context=new_tab["context"], url=page, wait="complete"
         )
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == page
+        assert await current_url(new_tab["context"]) == page
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=-1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[0]
+    await wait_for_url(new_tab["context"], pages[0])
 
     await bidi_session.browsing_context.traverse_history(
         context=new_tab["context"], delta=1
     )
 
-    assert await get_url_for_context(bidi_session, new_tab["context"]) == pages[1]
+    await wait_for_url(new_tab["context"], pages[1])
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/invalid.py
index abb0d69c937..c6a90601e70 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/traverse_history/invalid.py
@@ -1,5 +1,4 @@
 import pytest
-
 import webdriver.bidi.error as error
 
 
@@ -13,10 +12,12 @@ MIN_INT = -MAX_INT
 @pytest.mark.parametrize("value", [None, False, 42, {}, []])
 async def test_params_context_invalid_type(bidi_session, value):
     with pytest.raises(error.InvalidArgumentException):
-        await bidi_session.browsing_context.traverse_history(
-            context=value,
-            delta=1
-        )
+        await bidi_session.browsing_context.traverse_history(context=value, delta=1)
+
+
+async def test_params_context_invalid_value(bidi_session):
+    with pytest.raises(error.NoSuchFrameException):
+        await bidi_session.browsing_context.traverse_history(context="foo", delta=1)
 
 
 @pytest.mark.parametrize(
@@ -27,3 +28,17 @@ async def test_params_delta_invalid_type(bidi_session, top_context, value):
         await bidi_session.browsing_context.traverse_history(
             context=top_context["context"], delta=value
         )
+
+
+@pytest.mark.parametrize("value", [-2, 1])
+async def test_delta_invalid_value(bidi_session, current_url, new_tab, inline, value):
+    page = inline("<div>page 1</div>")
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"], url=page, wait="complete"
+    )
+    assert await current_url(new_tab["context"]) == page
+
+    with pytest.raises(error.NoSuchHistoryEntryException):
+        await bidi_session.browsing_context.traverse_history(
+            context=new_tab["context"], delta=value
+        )
diff --git a/tests/wpt/tests/webdriver/tests/classic/back/back.py b/tests/wpt/tests/webdriver/tests/classic/back/back.py
index dfd19452313..bfc5e0f4a39 100644
--- a/tests/wpt/tests/webdriver/tests/classic/back/back.py
+++ b/tests/wpt/tests/webdriver/tests/classic/back/back.py
@@ -76,28 +76,6 @@ def test_data_urls(session, inline):
     assert session.url == test_pages[0]
 
 
-def test_dismissed_beforeunload(session, inline):
-    url_beforeunload = inline("""
-      <input type="text">
-      <script>
-        window.addEventListener("beforeunload", function (event) {
-          event.preventDefault();
-        });
-      </script>
-    """)
-
-    session.url = inline("<div id=foo>")
-    session.url = url_beforeunload
-
-    element = session.find.css("input", all=False)
-    element.send_keys("bar")
-
-    response = back(session)
-    assert_success(response)
-
-    assert session.url != url_beforeunload
-
-
 def test_fragments(session, url):
     test_pages = [
         url("/common/blank.html"),
diff --git a/tests/wpt/tests/webdriver/tests/classic/back/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/back/user_prompts.py
index 9d04f0f4ab1..1020a6aaa61 100644
--- a/tests/wpt/tests/webdriver/tests/classic/back/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/back/user_prompts.py
@@ -1,6 +1,7 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
 
@@ -23,6 +24,31 @@ def pages(session, inline):
     return pages
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        session.url = page_target
+        session.url = page_beforeunload
+
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = back(session)
+        assert_success(response)
+
+        assert session.url == page_target
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog, pages):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -70,49 +96,96 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog, pages):
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/close_window/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/close_window/user_prompts.py
index c0f9cc7610c..37928f97589 100644
--- a/tests/wpt/tests/webdriver/tests/classic/close_window/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/close_window/user_prompts.py
@@ -10,6 +10,27 @@ def close(session):
         "DELETE", "session/{session_id}/window".format(**vars(session)))
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+
+        new_handle = session.new_window()
+        session.window_handle = new_handle
+
+        session.url = page_beforeunload
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = close(session)
+        assert_success(response)
+
+        assert new_handle not in session.handles
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -71,49 +92,96 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog):
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/element_click/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/element_click/user_prompts.py
index 140aceb3ced..a4c62cbca77 100644
--- a/tests/wpt/tests/webdriver/tests/classic/element_click/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/element_click/user_prompts.py
@@ -1,6 +1,7 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
 
@@ -12,6 +13,30 @@ def element_click(session, element):
             element_id=element.id))
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        session.url = page_beforeunload
+        input = session.find.css("input", all=False)
+        input.send_keys("bar")
+
+        link = session.find.css("a", all=False)
+        response = element_click(session, link)
+        assert_success(response)
+
+        assert session.url == page_target
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog, inline):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -70,53 +95,104 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog, inline):
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval,
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/execute_async_script/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/execute_async_script/user_prompts.py
index e39574fd4ac..5243b372e5a 100644
--- a/tests/wpt/tests/webdriver/tests/classic/execute_async_script/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/execute_async_script/user_prompts.py
@@ -1,11 +1,46 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
+from tests.support.sync import Poll
 from . import execute_async_script
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        session.url = page_beforeunload
+
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = execute_async_script(
+            session, """
+                const [url, resolve] = arguments;
+                window.location.href = url;
+                resolve();
+            """, args=(page_target,))
+        assert_success(response)
+
+        wait = Poll(
+            session,
+            timeout=5,
+            message="Target page did not load")
+        wait.until(lambda s: s.url == page_target)
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -57,53 +92,104 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog):
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/execute_script/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/execute_script/user_prompts.py
index 48d735ea754..74d4c47fc06 100644
--- a/tests/wpt/tests/webdriver/tests/classic/execute_script/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/execute_script/user_prompts.py
@@ -1,11 +1,42 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
+from tests.support.sync import Poll
 from . import execute_script
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        session.url = page_beforeunload
+
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = execute_script(
+            session, "window.location.href = arguments[0];", args=(page_target,))
+        assert_success(response)
+
+        wait = Poll(
+            session,
+            timeout=5,
+            message="Target page did not load")
+        wait.until(lambda s: s.url == page_target)
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -55,53 +86,104 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog):
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type, retval):
-    check_user_prompt_closed_without_exception(dialog_type, retval)
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_without_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/forward/forward.py b/tests/wpt/tests/webdriver/tests/classic/forward/forward.py
index 6774e522105..8bc75a07c0e 100644
--- a/tests/wpt/tests/webdriver/tests/classic/forward/forward.py
+++ b/tests/wpt/tests/webdriver/tests/classic/forward/forward.py
@@ -107,29 +107,6 @@ def test_data_urls(session, inline):
     assert session.url == test_pages[1]
 
 
-def test_dismissed_beforeunload(session, inline):
-    url_beforeunload = inline("""
-      <input type="text">
-      <script>
-        window.addEventListener("beforeunload", function (event) {
-          event.preventDefault();
-        });
-      </script>
-    """)
-
-    session.url = url_beforeunload
-    session.url = inline("<div id=foo>")
-    session.back()
-
-    element = session.find.css("input", all=False)
-    element.send_keys("bar")
-
-    response = forward(session)
-    assert_success(response)
-
-    assert session.url != url_beforeunload
-
-
 def test_fragments(session, url):
     test_pages = [
         url("/common/blank.html"),
diff --git a/tests/wpt/tests/webdriver/tests/classic/forward/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/forward/user_prompts.py
index 3eeaf6e71cd..dfcba6469d5 100644
--- a/tests/wpt/tests/webdriver/tests/classic/forward/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/forward/user_prompts.py
@@ -1,6 +1,7 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
 
@@ -25,6 +26,32 @@ def pages(session, inline):
     return pages
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        session.url = page_beforeunload
+        session.url = page_target
+        session.back()
+
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = forward(session)
+        assert_success(response)
+
+        assert session.url == page_target
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog, pages):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -73,49 +100,96 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog, pages):
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/get_alert_text/get.py b/tests/wpt/tests/webdriver/tests/classic/get_alert_text/get.py
index 7ee7ff1808f..e8d0aa04e61 100644
--- a/tests/wpt/tests/webdriver/tests/classic/get_alert_text/get.py
+++ b/tests/wpt/tests/webdriver/tests/classic/get_alert_text/get.py
@@ -57,6 +57,9 @@ def test_get_prompt_text(session, inline):
     assert prompt_text == "Enter Your Name: "
 
 
+# TODO: Add test for beforeunload?
+
+
 def test_unexpected_alert(session):
     session.execute_script("setTimeout(function() { alert('Hello'); }, 100);")
     wait = Poll(
diff --git a/tests/wpt/tests/webdriver/tests/classic/navigate_to/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/navigate_to/user_prompts.py
index 682bc40f4fe..db8d094ebbd 100644
--- a/tests/wpt/tests/webdriver/tests/classic/navigate_to/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/navigate_to/user_prompts.py
@@ -1,6 +1,7 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.support.asserts import assert_error, assert_success, assert_dialog_handled
 
@@ -11,6 +12,31 @@ def navigate_to(session, url):
         {"url": url})
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+        page_target = url("/webdriver/tests/support/html/default.html")
+
+        response = navigate_to(session, page_beforeunload)
+        assert_success(response)
+
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = navigate_to(session, page_target)
+        assert_success(response)
+
+        assert session.url == page_target
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog, inline):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -64,49 +90,96 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog, inline):
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window is gone
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/classic/perform_actions/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/perform_actions/user_prompts.py
index 872325bb313..7fcd720624b 100644
--- a/tests/wpt/tests/webdriver/tests/classic/perform_actions/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/perform_actions/user_prompts.py
@@ -1,9 +1,11 @@
 # META: timeout=long
 
 import pytest
+from webdriver import error
 
 from tests.classic.perform_actions.support.refine import get_keys
 from tests.support.asserts import assert_error, assert_success, assert_dialog_handled
+from tests.support.sync import Poll
 from . import perform_actions
 
 actions = [{
@@ -115,3 +117,28 @@ def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
 ])
 def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
     check_user_prompt_closed_with_exception(dialog_type, retval)
+
+
+def test_dismissed_beforeunload(session, url, mouse_chain):
+    page_beforeunload = url("/webdriver/tests/support/html/beforeunload.html")
+    page_target = url("/webdriver/tests/support/html/default.html")
+
+    session.url = page_beforeunload
+    input = session.find.css("input", all=False)
+    input.send_keys("bar")
+
+    link = session.find.css("a", all=False)
+
+    mouse_chain.pointer_move(0, 0, origin=link) \
+        .click() \
+        .perform()
+
+    wait = Poll(
+        session,
+        timeout=5,
+        message="Target page did not load")
+    wait.until(lambda s: s.url == page_target)
+
+    # navigation auto-dismissed beforeunload prompt
+    with pytest.raises(error.NoSuchAlertException):
+        session.alert.text
diff --git a/tests/wpt/tests/webdriver/tests/classic/refresh/refresh.py b/tests/wpt/tests/webdriver/tests/classic/refresh/refresh.py
index 19490a0a458..3f434a3012f 100644
--- a/tests/wpt/tests/webdriver/tests/classic/refresh/refresh.py
+++ b/tests/wpt/tests/webdriver/tests/classic/refresh/refresh.py
@@ -63,29 +63,6 @@ def test_seen_nodes(session, get_test_page, protocol, parameters):
     session.find.css("#custom-element", all=False)
 
 
-def test_dismissed_beforeunload(session, inline):
-    url_beforeunload = inline("""
-      <input type="text">
-      <script>
-        window.addEventListener("beforeunload", function (event) {
-          event.preventDefault();
-        });
-      </script>
-    """)
-
-    session.url = url_beforeunload
-    element = session.find.css("input", all=False)
-    element.send_keys("bar")
-
-    response = refresh(session)
-    assert_success(response)
-
-    with pytest.raises(error.StaleElementReferenceException):
-        element.property("id")
-
-    session.find.css("input", all=False)
-
-
 def test_history_pushstate(session, inline):
     pushstate_page = inline("""
       <script>
diff --git a/tests/wpt/tests/webdriver/tests/classic/refresh/user_prompts.py b/tests/wpt/tests/webdriver/tests/classic/refresh/user_prompts.py
index 7e944b53b09..5787533b572 100644
--- a/tests/wpt/tests/webdriver/tests/classic/refresh/user_prompts.py
+++ b/tests/wpt/tests/webdriver/tests/classic/refresh/user_prompts.py
@@ -2,7 +2,7 @@
 
 import pytest
 
-from webdriver.error import StaleElementReferenceException
+from webdriver import error
 
 from tests.support.asserts import assert_dialog_handled, assert_error, assert_success
 
@@ -12,6 +12,31 @@ def refresh(session):
         "POST", "session/{session_id}/refresh".format(**vars(session)))
 
 
+@pytest.fixture
+def check_beforeunload_implicitly_accepted(session, url):
+    def check_beforeunload_implicitly_accepted():
+        page_beforeunload = url(
+            "/webdriver/tests/support/html/beforeunload.html")
+
+        session.url = page_beforeunload
+        element = session.find.css("input", all=False)
+        element.send_keys("bar")
+
+        response = refresh(session)
+        assert_success(response)
+
+        # navigation auto-dismissed beforeunload prompt
+        with pytest.raises(error.NoSuchAlertException):
+            session.alert.text
+
+        with pytest.raises(error.StaleElementReferenceException):
+            element.property("id")
+
+        session.find.css("input", all=False)
+
+    return check_beforeunload_implicitly_accepted
+
+
 @pytest.fixture
 def check_user_prompt_closed_without_exception(session, create_dialog, inline):
     def check_user_prompt_closed_without_exception(dialog_type, retval):
@@ -25,7 +50,7 @@ def check_user_prompt_closed_without_exception(session, create_dialog, inline):
 
         assert_dialog_handled(session, expected_text=dialog_type, expected_retval=retval)
 
-        with pytest.raises(StaleElementReferenceException):
+        with pytest.raises(error.StaleElementReferenceException):
             element.property("id")
 
     return check_user_prompt_closed_without_exception
@@ -69,49 +94,96 @@ def check_user_prompt_not_closed_but_exception(session, create_dialog, inline):
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_accept(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window has been reloaded
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_accept(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "accept and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", True),
     ("prompt", ""),
 ])
-def test_accept_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_accept_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_dismiss(check_user_prompt_closed_without_exception, dialog_type):
-    # retval not testable for confirm and prompt because window has been reloaded
-    check_user_prompt_closed_without_exception(dialog_type, None)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_dismiss(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_without_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        # retval not testable for confirm and prompt because window is gone
+        check_user_prompt_closed_without_exception(dialog_type, None)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "dismiss and notify"})
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_dismiss_and_notify(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_dismiss_and_notify(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception, dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
 
 
 @pytest.mark.capabilities({"unhandledPromptBehavior": "ignore"})
-@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
-def test_ignore(check_user_prompt_not_closed_but_exception, dialog_type):
-    check_user_prompt_not_closed_but_exception(dialog_type)
+@pytest.mark.parametrize("dialog_type", ["alert", "beforeunload", "confirm", "prompt"])
+def test_ignore(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_not_closed_but_exception,
+    dialog_type
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_not_closed_but_exception(dialog_type)
 
 
 @pytest.mark.parametrize("dialog_type, retval", [
     ("alert", None),
+    ("beforeunload", None),
     ("confirm", False),
     ("prompt", None),
 ])
-def test_default(check_user_prompt_closed_with_exception, dialog_type, retval):
-    check_user_prompt_closed_with_exception(dialog_type, retval)
+def test_default(
+    check_beforeunload_implicitly_accepted,
+    check_user_prompt_closed_with_exception,
+    dialog_type,
+    retval
+):
+    if dialog_type == "beforeunload":
+        check_beforeunload_implicitly_accepted()
+    else:
+        check_user_prompt_closed_with_exception(dialog_type, retval)
diff --git a/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py b/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
index e47d7850a53..177bdda160e 100644
--- a/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
+++ b/tests/wpt/tests/webdriver/tests/support/fixtures_bidi.py
@@ -350,6 +350,15 @@ def compare_png_bidi(bidi_session, url):
     return compare_png_bidi
 
 
+@pytest.fixture
+def current_url(bidi_session):
+    async def current_url(context):
+        contexts = await bidi_session.browsing_context.get_tree(root=context, max_depth=0)
+        return contexts[0]["url"]
+
+    return current_url
+
+
 @pytest.fixture
 def get_element(bidi_session, top_context):
     async def get_element(css_selector, context=top_context):
diff --git a/tests/wpt/tests/webdriver/tests/support/html/beforeunload.html b/tests/wpt/tests/webdriver/tests/support/html/beforeunload.html
new file mode 100644
index 00000000000..d4332c28941
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/support/html/beforeunload.html
@@ -0,0 +1,16 @@
+<html>
+
+  <head>
+    <script>
+      window.addEventListener("beforeunload", function (event) {
+        event.preventDefault();
+      });
+    </script>
+  </head>
+
+  <body>
+    <input type="text" />
+    <a href="default.html" target="_top">Click</a>
+  </body>
+
+</html>
diff --git a/tests/wpt/tests/webdriver/tests/support/html/default.html b/tests/wpt/tests/webdriver/tests/support/html/default.html
new file mode 100644
index 00000000000..c15d0a7eb75
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/support/html/default.html
@@ -0,0 +1,7 @@
+<html>
+
+  <body>
+    <div>Foo</div>
+  </body>
+
+</html>
diff --git a/tests/wpt/tests/webdriver/tests/support/sync.py b/tests/wpt/tests/webdriver/tests/support/sync.py
index 015ebd37a09..4e92bcdf23e 100644
--- a/tests/wpt/tests/webdriver/tests/support/sync.py
+++ b/tests/wpt/tests/webdriver/tests/support/sync.py
@@ -1,5 +1,6 @@
 import asyncio
 import collections
+import inspect
 import sys
 import time
 
@@ -250,6 +251,8 @@ class AsyncPoll(object):
 
                 try:
                     result = condition(self.session)
+                    if inspect.isawaitable(result):
+                        result = await result
                 except (KeyboardInterrupt, SystemExit):
                     raise
                 except self.exceptions:
diff --git a/tests/wpt/tests/webnn/resources/test_data/matmul.json b/tests/wpt/tests/webnn/resources/test_data/matmul.json
index 2477b78add4..f3a03e442e9 100644
--- a/tests/wpt/tests/webnn/resources/test_data/matmul.json
+++ b/tests/wpt/tests/webnn/resources/test_data/matmul.json
@@ -515,6 +515,124 @@
         "type": "float32"
       }
     },
+    {
+      "name": "matmul float32 4D and 4D tensors",
+      "inputs": {
+        "a": {
+          "shape": [2, 1, 3, 4],
+          "data": [
+            56.46701250066562,
+            99.86045478237251,
+            71.05493372292567,
+            32.45438455331333,
+            17.310747999630017,
+            2.586275053048559,
+            92.31499166302054,
+            96.9758519231732,
+            26.4721315276526,
+            77.67031776320978,
+            29.278788710989147,
+            82.12142428847062,
+            89.89308471484885,
+            82.49795321217854,
+            64.36866008901963,
+            23.75928513568486,
+            6.67026681065197,
+            81.55583129445503,
+            16.142963270263433,
+            57.45134849716054,
+            26.82641739603182,
+            85.0296980735713,
+            36.198863464757956,
+            89.60960360138286
+          ],
+          "type": "float32"
+        },
+        "b": {
+          "shape": [2, 1, 4, 5],
+          "data": [
+            70.38780515954635,
+            25.489176068987597,
+            28.25419591483602,
+            84.51486608529449,
+            58.87341530615436,
+            46.252837428713555,
+            24.897335441310766,
+            44.09449366886899,
+            51.865646783698985,
+            1.123237180407144,
+            4.187554708673558,
+            71.24650172124491,
+            16.0345266486708,
+            23.677297120787454,
+            61.277276711169094,
+            65.15946418752658,
+            58.392497125216906,
+            70.12740970610143,
+            9.119727538574839,
+            24.17997835305117,
+            84.42636665997716,
+            78.55551451746716,
+            38.482969428827076,
+            80.65414903244603,
+            57.15212267967695,
+            46.10971199065528,
+            28.41227860070996,
+            90.9256677352717,
+            94.66067935241847,
+            61.772877196686295,
+            60.324859158187635,
+            70.97433442190315,
+            10.631051143172332,
+            55.616284948780525,
+            35.0523090419651,
+            22.128390497020668,
+            38.19757703840079,
+            78.17564687251797,
+            62.57684276680773,
+            88.35256743439288
+          ],
+          "type": "float32"
+        }
+      },
+      "expected": {
+        "name": "output",
+        "shape": [2, 1, 3, 5],
+        "data": [
+          11005.6748046875,
+          10883.064453125,
+          9414.0009765625,
+          11929.9931640625,
+          8575.3720703125,
+          8043.556640625,
+          12745.41015625,
+          8884.0341796875,
+          4667.3173828125,
+          9023.7333984375,
+          10929.3818359375,
+          9489.8232421875,
+          10401.216796875,
+          7707.87744140625,
+          5425.5654296875,
+          15802.0888671875,
+          14881.6220703125,
+          13502.23828125,
+          20126.2890625,
+          14589.1806640625,
+          6568.7900390625,
+          6181.41162109375,
+          12335.123046875,
+          12751.05078125,
+          11060.98046875,
+          10352.16015625,
+          10515.310546875,
+          16153.86328125,
+          17833.36328125,
+          15971.80859375
+        ],
+        "type": "float32"
+      }
+    },
     {
       "name": "matmul float32 3D and 3D (broadcast) tensors",
       "inputs": {
diff --git a/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-captureTimestamp.html b/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-captureTimestamp.html
index 60b4ed0a74f..22ca5709b5f 100644
--- a/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-captureTimestamp.html
+++ b/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-captureTimestamp.html
@@ -7,7 +7,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/webrtc/RTCPeerConnection-helper.js"></script>
-<script src="/webrtc/RTCStats-helper.js"></script>
 <script src="/webrtc-extensions/RTCRtpSynchronizationSource-helper.js"></script>
 <script>
 'use strict';
diff --git a/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-senderCaptureTimeOffset.html b/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-senderCaptureTimeOffset.html
index 63ad9bf888c..88bd75bfaa4 100644
--- a/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-senderCaptureTimeOffset.html
+++ b/tests/wpt/tests/webrtc-extensions/RTCRtpSynchronizationSource-senderCaptureTimeOffset.html
@@ -7,7 +7,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/webrtc/RTCPeerConnection-helper.js"></script>
-<script src="/webrtc/RTCStats-helper.js"></script>
 <script src="/webrtc-extensions/RTCRtpSynchronizationSource-helper.js"></script>
 <script>
 'use strict';
diff --git a/tests/wpt/tests/webrtc-stats/README.md b/tests/wpt/tests/webrtc-stats/README.md
index 2b693728948..4653f415470 100644
--- a/tests/wpt/tests/webrtc-stats/README.md
+++ b/tests/wpt/tests/webrtc-stats/README.md
@@ -1,7 +1,6 @@
-The following 4 test cases in the `webrtc/` directory test some of the mandatory-to-implement stats defined in WebRTC Statistics:
+The following test cases in the `webrtc/` directory test some of the mandatory-to-implement stats defined in WebRTC Statistics:
 
 * `getstats.html`
 * `RTCPeerConnection-getStats.https.html`
-* `RTCPeerConnection-track-stats.https.html`
 * `RTCRtpReceiver-getStats.https.html`
 * `RTCRtpSender-getStats.https.html`
diff --git a/tests/wpt/tests/webrtc-stats/getStats-remote-candidate-address.html b/tests/wpt/tests/webrtc-stats/getStats-remote-candidate-address.html
index 08e2aec90e6..d30f2252bf2 100644
--- a/tests/wpt/tests/webrtc-stats/getStats-remote-candidate-address.html
+++ b/tests/wpt/tests/webrtc-stats/getStats-remote-candidate-address.html
@@ -4,7 +4,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="../webrtc/RTCPeerConnection-helper.js"></script>
-<script src="../webrtc/RTCStats-helper.js"></script>
 <script>
   'use strict';
 
@@ -36,7 +35,7 @@ promise_test(async (test) => {
         remoteDataChannel.onmessage = resolve;
     });
 
-    const remoteCandidateStats = getRequiredStats(await localPc.getStats(), "remote-candidate");
+    const remoteCandidateStats = [...(await localPc.getStats()).values()].find(({type}) => type === 'remote-candidate');
     assert_equals(remoteCandidateStats.address, null, "address should be null");
 }, "Do not expose in stats remote addresses that are not known to be already exposed to JS");
 
@@ -73,9 +72,8 @@ promise_test(async (test) => {
         remoteDataChannel.onmessage = resolve;
     });
 
-    const remoteCandidateStats = getRequiredStats(await localPc.getStats(), "remote-candidate");
+    const remoteCandidateStats = [...(await localPc.getStats()).values()].find(({type}) => type === 'remote-candidate');
     assert_not_equals(remoteCandidateStats.address, null, "address should not be null");
-
 }, "Expose in stats remote addresses that are already exposed to JS");
 
 </script>
diff --git a/tests/wpt/tests/webrtc-stats/hardware-capability-stats.https.html b/tests/wpt/tests/webrtc-stats/hardware-capability-stats.https.html
index 49f80d4b652..a6293e85004 100644
--- a/tests/wpt/tests/webrtc-stats/hardware-capability-stats.https.html
+++ b/tests/wpt/tests/webrtc-stats/hardware-capability-stats.https.html
@@ -7,7 +7,6 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="../webrtc/RTCPeerConnection-helper.js"></script>
-<script src="../webrtc/RTCStats-helper.js"></script>
 <script>
 /*
  * Test stats that expose hardware capabilities are only exposed according to
diff --git a/tests/wpt/tests/webrtc-stats/supported-stats.https.html b/tests/wpt/tests/webrtc-stats/supported-stats.https.html
index f7cb08591bf..b886778e516 100644
--- a/tests/wpt/tests/webrtc-stats/supported-stats.https.html
+++ b/tests/wpt/tests/webrtc-stats/supported-stats.https.html
@@ -5,18 +5,13 @@
 <script src=/resources/testharness.js></script>
 <script src=/resources/testharnessreport.js></script>
 <script src="../webrtc/RTCPeerConnection-helper.js"></script>
-<script src="../webrtc/dictionary-helper.js"></script>
-<script src="../webrtc/RTCStats-helper.js"></script>
 <script src="/resources/WebIDLParser.js"></script>
 <script>
 'use strict';
 
 // inspired from similar test for MTI stats in ../webrtc/RTCPeerConnection-mandatory-getStats.https.html
 
-
-
 // From https://w3c.github.io/webrtc-stats/webrtc-stats.html#rtcstatstype-str*
-
 const dictionaryNames = {
   "codec": "RTCCodecStats",
   "inbound-rtp": "RTCInboundRtpStreamStats",
@@ -119,7 +114,6 @@ async function getAllStats(t, pc) {
   return stats;
 }
 
-
 promise_test(async t => {
   // load the IDL to know which members to be looking for
   const idl = await fetch("/interfaces/webrtc-stats.idl").then(r => r.text());
diff --git a/tests/wpt/tests/webrtc/RTCPeerConnection-getStats.https.html b/tests/wpt/tests/webrtc/RTCPeerConnection-getStats.https.html
index 66cbedbc6f7..85ce8bc9f55 100644
--- a/tests/wpt/tests/webrtc/RTCPeerConnection-getStats.https.html
+++ b/tests/wpt/tests/webrtc/RTCPeerConnection-getStats.https.html
@@ -5,8 +5,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="RTCPeerConnection-helper.js"></script>
-<script src="dictionary-helper.js"></script>
-<script src="RTCStats-helper.js"></script>
 <script>
   'use strict';
 
@@ -17,10 +15,6 @@
   // The following helper function is called from RTCPeerConnection-helper.js
   //   getTrackFromUserMedia
 
-  // The following helper function is called from RTCStats-helper.js
-  //   validateStatsReport
-  //   assert_stats_report_has_stats
-
   // The following helper function is called from RTCPeerConnection-helper.js
   //   exchangeIceCandidates
   //   exchangeOfferAnswer
@@ -114,8 +108,7 @@
     t.add_cleanup(() => pc.close());
     return pc.getStats()
     .then(statsReport => {
-      validateStatsReport(statsReport);
-      assert_stats_report_has_stats(statsReport, ['peer-connection']);
+      assert_true(!![...statsReport.values()].find(({type}) => type === 'peer-connection'));
     });
   }, 'getStats() with no argument should return stats report containing peer-connection stats on an empty PC');
 
@@ -130,8 +123,8 @@
       new Promise(r => pc2.ontrack = e => e.track.onunmute = r)
     ]);
     const statsReport = await pc.getStats();
-    getRequiredStats(statsReport, 'peer-connection');
-    getRequiredStats(statsReport, 'outbound-rtp');
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'peer-connection'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
   }, 'getStats() track with stream returns peer-connection and outbound-rtp stats');
 
   promise_test(async t => {
@@ -145,8 +138,8 @@
       new Promise(r => pc2.ontrack = e => e.track.onunmute = r)
     ]);
     const statsReport = await pc.getStats();
-    getRequiredStats(statsReport, 'peer-connection');
-    getRequiredStats(statsReport, 'outbound-rtp');
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'peer-connection'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
   }, 'getStats() track without stream returns peer-connection and outbound-rtp stats');
 
   promise_test(async t => {
@@ -160,8 +153,8 @@
       new Promise(r => pc2.ontrack = e => e.track.onunmute = r)
     ]);
     const statsReport = await pc.getStats();
-    assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
-  }, 'getStats() audio outbound-rtp contains all mandatory stats');
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
+  }, 'getStats() audio contains outbound-rtp stats');
 
   promise_test(async t => {
     const pc = createPeerConnectionWithCleanup(t);
@@ -174,8 +167,8 @@
       new Promise(r => pc2.ontrack = e => e.track.onunmute = r)
     ]);
     const statsReport = await pc.getStats();
-    assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
-  }, 'getStats() video outbound-rtp contains all mandatory stats');
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
+  }, 'getStats() video contains outbound-rtp stats');
 
   /*
     8.5.  The stats selection algorithm
@@ -196,8 +189,8 @@
       exchangeOfferAnswer(pc, pc2),
       new Promise(r => pc2.ontrack = e => e.track.onunmute = r)
     ]);
-    const stats = await pc.getStats(sendtrack);
-    getRequiredStats(stats, 'outbound-rtp');
+    const statsReport = await pc.getStats(sendtrack);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
   }, `getStats() on track associated with RTCRtpSender should return stats report containing outbound-rtp stats`);
 
   /*
@@ -224,8 +217,8 @@
         pc2.getReceivers()[0].track.addEventListener('unmute', resolve);
       });
     }
-    const stats = await pc2.getStats(pc2.getReceivers()[0].track);
-    getRequiredStats(stats, 'inbound-rtp');
+    const statsReport = await pc2.getStats(pc2.getReceivers()[0].track);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'inbound-rtp'));
   }, `getStats() on track associated with RTCRtpReceiver should return stats report containing inbound-rtp stats`);
 
   promise_test(async t => {
@@ -244,9 +237,9 @@
         pc2.getReceivers()[0].track.addEventListener('unmute', resolve);
       });
     }
-    const stats = await pc2.getStats(pc2.getReceivers()[0].track);
-    getRequiredStats(stats, 'inbound-rtp');
-  }, `getStats() inbound-rtp contains all mandatory stats`);
+    const statsReport = await pc2.getStats(pc2.getReceivers()[0].track);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'inbound-rtp'));
+  }, `getStats() audio contains inbound-rtp stats`);
 
   promise_test(async t => {
     const pc = new RTCPeerConnection();
@@ -262,10 +255,10 @@
     const pc = new RTCPeerConnection();
     t.add_cleanup(() => pc.close());
     const t0 = Math.floor(performance.now());
-    const t0Stats = getRequiredStats(await pc.getStats(), 'peer-connection');
+    const t0Stats = [...(await pc.getStats()).values()].find(({type}) => type === 'peer-connection');
     await new Promise(
         r => t.step_timeout(r, kMinimumTimeElapsedBetweenGetStatsCallsMs));
-    const t1Stats = getRequiredStats(await pc.getStats(), 'peer-connection');
+    const t1Stats = [...(await pc.getStats()).values()].find(({type}) => type === 'peer-connection');
     const t1 = Math.ceil(performance.now());
     const maximumTimeElapsedBetweenGetStatsCallsMs = t1 - t0;
     const deltaTimestampMs = t1Stats.timestamp - t0Stats.timestamp;
diff --git a/tests/wpt/tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html b/tests/wpt/tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
index b1280080382..ba04a454691 100644
--- a/tests/wpt/tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
+++ b/tests/wpt/tests/webrtc/RTCPeerConnection-mandatory-getStats.https.html
@@ -5,8 +5,6 @@
 <script src=/resources/testharness.js></script>
 <script src=/resources/testharnessreport.js></script>
 <script src="RTCPeerConnection-helper.js"></script>
-<script src="dictionary-helper.js"></script>
-<script src="RTCStats-helper.js"></script>
 <script>
 'use strict';
 
diff --git a/tests/wpt/tests/webrtc/RTCRtpReceiver-getStats.https.html b/tests/wpt/tests/webrtc/RTCRtpReceiver-getStats.https.html
index 39948ed6f7f..d9344b176e3 100644
--- a/tests/wpt/tests/webrtc/RTCRtpReceiver-getStats.https.html
+++ b/tests/wpt/tests/webrtc/RTCRtpReceiver-getStats.https.html
@@ -5,46 +5,9 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="RTCPeerConnection-helper.js"></script>
-<script src="dictionary-helper.js"></script>
-<script src="RTCStats-helper.js"></script>
 <script>
   'use strict';
 
-  // Test is based on the following editor draft:
-  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
-  // https://w3c.github.io/webrtc-stats/archives/20170614/webrtc-stats.html
-
-  // The following helper functions are called from RTCPeerConnection-helper.js:
-  //   exchangeOfferAnswer
-
-  // The following helper function is called from RTCStats-helper.js
-  //   validateStatsReport
-  //   assert_stats_report_has_stats
-
-  /*
-    5.3.  RTCRtpReceiver Interface
-      interface RTCRtpReceiver {
-         Promise<RTCStatsReport> getStats();
-          ...
-      };
-
-      getStats
-        1.  Let selector be the RTCRtpReceiver object on which the method was invoked.
-        2.  Let p be a new promise, and run the following steps in parallel:
-          1.  Gather the stats indicated by selector according to the stats selection
-              algorithm.
-          2.  Resolve p with the resulting RTCStatsReport object, containing the
-              gathered stats.
-        3.  Return p.
-
-    8.5. The stats selection algorithm
-      4.  If selector is an RTCRtpReceiver, gather stats for and add the following objects
-          to result:
-        - All RTCInboundRtpStreamStats objects corresponding to selector.
-        - All stats objects referenced directly or indirectly by the RTCInboundRtpStreamStats
-          added.
-   */
-
   promise_test(async t => {
     const caller = new RTCPeerConnection();
     t.add_cleanup(() => caller.close());
@@ -58,10 +21,11 @@
 
     const { receiver } = caller.addTransceiver('audio');
 
+    exchangeIceCandidates(caller, callee);
     await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(callee);
     const statsReport = await receiver.getStats();
-    validateStatsReport(statsReport);
-    assert_stats_report_has_stats(statsReport, ['inbound-rtp']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'inbound-rtp'));
   }, 'receiver.getStats() via addTransceiver should return stats report containing inbound-rtp stats');
 
   promise_test(async t => {
@@ -74,55 +38,14 @@
     const [track] = stream.getTracks();
     caller.addTrack(track, stream);
 
+    exchangeIceCandidates(caller, callee);
     await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(callee);
     const receiver = callee.getReceivers()[0];
     const statsReport = await receiver.getStats();
-    validateStatsReport(statsReport);
-    assert_stats_report_has_stats(statsReport, ['inbound-rtp']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'inbound-rtp'));
   }, 'receiver.getStats() via addTrack should return stats report containing inbound-rtp stats');
 
-
-  promise_test(async t => {
-    const caller = new RTCPeerConnection();
-    t.add_cleanup(() => caller.close());
-    const callee = new RTCPeerConnection();
-    t.add_cleanup(() => callee.close());
-    const stream = await getNoiseStream({audio:true});
-    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
-    const [track] = stream.getTracks();
-    caller.addTrack(track, stream);
-
-    await exchangeOfferAnswer(caller, callee);
-    const [receiver] = callee.getReceivers();
-    const [transceiver] = callee.getTransceivers();
-    const statsPromiseFirst = receiver.getStats();
-    transceiver.stop();
-    const statsReportFirst = await statsPromiseFirst;
-    const statsReportSecond = await receiver.getStats();
-    validateStatsReport(statsReportFirst);
-    validateStatsReport(statsReportSecond);
-  }, 'receiver.getStats() should work on a stopped transceiver');
-
-  promise_test(async t => {
-    const caller = new RTCPeerConnection();
-    t.add_cleanup(() => caller.close());
-    const callee = new RTCPeerConnection();
-    t.add_cleanup(() => callee.close());
-    const stream = await getNoiseStream({audio:true});
-    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
-    const [track] = stream.getTracks();
-    caller.addTrack(track, stream);
-
-    await exchangeOfferAnswer(caller, callee);
-    const [receiver] = callee.getReceivers();
-    const statsPromiseFirst = receiver.getStats();
-    callee.close();
-    const statsReportFirst = await statsPromiseFirst;
-    const statsReportSecond = await receiver.getStats();
-    validateStatsReport(statsReportFirst);
-    validateStatsReport(statsReportSecond);
-  }, 'receiver.getStats() should work with a closed PeerConnection');
-
   promise_test(async t => {
     const caller = new RTCPeerConnection();
     t.add_cleanup(() => caller.close());
@@ -134,12 +57,57 @@
     caller.addTrack(track, stream);
 
     exchangeIceCandidates(caller, callee);
-    exchangeIceCandidates(callee, caller);
     await exchangeOfferAnswer(caller, callee);
-    await waitForIceStateChange(callee, ['connected', 'completed']);
+    await listenToConnected(callee);
+    const [receiver] = callee.getReceivers();
+    const [transceiver] = callee.getTransceivers();
+    const statsPromiseFirst = receiver.getStats();
+    transceiver.stop();
+    const statsReportFirst = await statsPromiseFirst;
+    const statsReportSecond = await receiver.getStats();
+    assert_true(!![...statsReportFirst.values()].find(({type}) => type === 'inbound-rtp'));
+    assert_false(!![...statsReportSecond.values()].find(({type}) => type === 'inbound-rtp'));
+  }, 'receiver.getStats() should work on a stopped transceiver but not have inbound-rtp objects');
+
+  promise_test(async t => {
+    const caller = new RTCPeerConnection();
+    t.add_cleanup(() => caller.close());
+    const callee = new RTCPeerConnection();
+    t.add_cleanup(() => callee.close());
+    const stream = await getNoiseStream({audio:true});
+    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
+    const [track] = stream.getTracks();
+    caller.addTrack(track, stream);
+
+    exchangeIceCandidates(caller, callee);
+    await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(callee);
+    const [receiver] = callee.getReceivers();
+    const statsReportFirst = await receiver.getStats();
+    callee.close();
+    const statsReportSecond = await receiver.getStats();
+    assert_true(!![...statsReportFirst.values()].find(({type}) => type === 'inbound-rtp'));
+    assert_false(!![...statsReportSecond.values()].find(({type}) => type === 'inbound-rtp'));
+  }, 'receiver.getStats() should work with a closed PeerConnection but not have inbound-rtp objects');
+
+  promise_test(async t => {
+    const caller = new RTCPeerConnection();
+    t.add_cleanup(() => caller.close());
+    const callee = new RTCPeerConnection();
+    t.add_cleanup(() => callee.close());
+    const stream = await getNoiseStream({audio:true});
+    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
+    const [track] = stream.getTracks();
+    caller.addTrack(track, stream);
+
+    exchangeIceCandidates(caller, callee);
+    await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(callee);
     const receiver = callee.getReceivers()[0];
     const statsReport = await receiver.getStats();
-    assert_stats_report_has_stats(statsReport, ['candidate-pair', 'local-candidate', 'remote-candidate']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'candidate-pair'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'local-candidate'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'remote-candidate'));
   }, 'receiver.getStats() should return stats report containing ICE candidate stats');
 
 </script>
diff --git a/tests/wpt/tests/webrtc/RTCRtpSender-getStats.https.html b/tests/wpt/tests/webrtc/RTCRtpSender-getStats.https.html
index 62c01aafa6a..797365e9f4e 100644
--- a/tests/wpt/tests/webrtc/RTCRtpSender-getStats.https.html
+++ b/tests/wpt/tests/webrtc/RTCRtpSender-getStats.https.html
@@ -5,41 +5,9 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="RTCPeerConnection-helper.js"></script>
-<script src="dictionary-helper.js"></script>
-<script src="RTCStats-helper.js"></script>
 <script>
   'use strict';
 
-  // Test is based on the following editor draft:
-  // webrtc-pc 20171130
-  // webrtc-stats 20171122
-
-  // The following helper functions are called from RTCPeerConnection-helper.js:
-  //   exchangeOfferAnswer
-
-  // The following helper function is called from RTCStats-helper.js
-  //   validateStatsReport
-  //   assert_stats_report_has_stats
-
-  /*
-    5.2.  RTCRtpSender Interface
-      getStats
-        1.  Let selector be the RTCRtpSender object on which the method was invoked.
-        2.  Let p be a new promise, and run the following steps in parallel:
-          1.  Gather the stats indicated by selector according to the stats selection
-              algorithm.
-          2.  Resolve p with the resulting RTCStatsReport object, containing the
-              gathered stats.
-        3.  Return p.
-
-    8.5. The stats selection algorithm
-      3.  If selector is an RTCRtpSender, gather stats for and add the following objects
-          to result:
-        - All RTCOutboundRtpStreamStats objects corresponding to selector.
-        - All stats objects referenced directly or indirectly by the RTCOutboundRtpStreamStats
-          objects added.
-   */
-
   promise_test(async t => {
     const caller = new RTCPeerConnection();
     t.add_cleanup(() => caller.close());
@@ -51,10 +19,11 @@
     const [track] = stream.getTracks();
     const { sender } = caller.addTransceiver(track);
 
+    exchangeIceCandidates(caller, callee);
     await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(caller);
     const statsReport = await sender.getStats();
-    validateStatsReport(statsReport);
-    assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
   }, 'sender.getStats() via addTransceiver should return stats report containing outbound-rtp stats');
 
   promise_test(async t => {
@@ -67,12 +36,57 @@
     const [track] = stream.getTracks();
     const sender = caller.addTrack(track, stream);
 
+    exchangeIceCandidates(caller, callee);
     await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(caller);
     const statsReport = await sender.getStats();
-    validateStatsReport(statsReport);
-    assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'outbound-rtp'));
   }, 'sender.getStats() via addTrack should return stats report containing outbound-rtp stats');
 
+  promise_test(async t => {
+    const caller = new RTCPeerConnection();
+    t.add_cleanup(() => caller.close());
+    const callee = new RTCPeerConnection();
+    t.add_cleanup(() => callee.close());
+    const stream = await getNoiseStream({audio:true});
+    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
+    const [track] = stream.getTracks();
+    caller.addTrack(track, stream);
+
+    exchangeIceCandidates(caller, callee);
+    await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(caller);
+
+    const [sender] = caller.getSenders();
+    const [transceiver] = caller.getTransceivers();
+    const statsReportFirst = await sender.getStats();
+    transceiver.stop();
+    const statsReportSecond = await sender.getStats();
+    assert_true(!![...statsReportFirst.values()].find(({type}) => type === 'outbound-rtp'));
+    assert_false(!![...statsReportSecond.values()].find(({type}) => type === 'outbound-rtp'));
+  }, 'sender.getStats() should work on a stopped transceiver but not have outbound-rtp stats');
+
+  promise_test(async t => {
+    const caller = new RTCPeerConnection();
+    t.add_cleanup(() => caller.close());
+    const callee = new RTCPeerConnection();
+    t.add_cleanup(() => callee.close());
+    const stream = await getNoiseStream({audio:true});
+    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
+    const [track] = stream.getTracks();
+    caller.addTrack(track, stream);
+
+    exchangeIceCandidates(caller, callee);
+    await exchangeOfferAnswer(caller, callee);
+    await listenToConnected(callee);
+    const [sender] = caller.getSenders();
+    const statsReportFirst = await sender.getStats();
+    caller.close();
+    const statsReportSecond = await sender.getStats();
+    assert_true(!![...statsReportFirst.values()].find(({type}) => type === 'outbound-rtp'));
+    assert_false(!![...statsReportSecond.values()].find(({type}) => type === 'outbound-rtp'));
+  }, 'sender.getStats() should work with a closed PeerConnection but not have outbound-rtp objects');
+
   promise_test(async t => {
     const caller = new RTCPeerConnection();
     t.add_cleanup(() => caller.close());
@@ -84,14 +98,12 @@
     const { sender } = caller.addTransceiver(track);
 
     exchangeIceCandidates(caller, callee);
-    exchangeIceCandidates(callee, caller);
     await exchangeOfferAnswer(caller, callee);
-    // Pairing should be possible as soon as we are 'checking', but to allow the
-    // pairing to happen asynchronously, we wait until 'connected' or
-    // 'completed' instead as it is not possible to reach these without a pair.
-    await waitForIceStateChange(caller, ['connected', 'completed']);
+    await listenToConnected(caller);
     const statsReport = await sender.getStats();
-    assert_stats_report_has_stats(statsReport, ['candidate-pair', 'local-candidate', 'remote-candidate']);
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'candidate-pair'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'local-candidate'));
+    assert_true(!![...statsReport.values()].find(({type}) => type === 'remote-candidate'));
   }, 'sender.getStats() should return stats report containing ICE candidate stats');
 
 </script>
diff --git a/tests/wpt/tests/webrtc/RTCStats-helper.js b/tests/wpt/tests/webrtc/RTCStats-helper.js
deleted file mode 100644
index 29d4940a8ae..00000000000
--- a/tests/wpt/tests/webrtc/RTCStats-helper.js
+++ /dev/null
@@ -1,973 +0,0 @@
-'use strict';
-
-// Test is based on the following editor draft:
-// webrtc-pc 20171130
-// webrtc-stats 20171122
-
-// This file depends on dictionary-helper.js which should
-// be loaded from the main HTML file.
-
-/*
-  [webrtc-stats]
-  6.1.  RTCStatsType enum
-    enum RTCStatsType {
-      "codec",
-      "inbound-rtp",
-      "outbound-rtp",
-      "remote-inbound-rtp",
-      "remote-outbound-rtp",
-      "csrc",
-      "peer-connection",
-      "data-channel",
-      "transport",
-      "candidate-pair",
-      "local-candidate",
-      "remote-candidate",
-      "certificate",
-      "ice-server"
-    };
- */
-const statsValidatorTable = {
-  'codec': validateCodecStats,
-  'inbound-rtp': validateInboundRtpStreamStats,
-  'outbound-rtp': validateOutboundRtpStreamStats,
-  'remote-inbound-rtp': validateRemoteInboundRtpStreamStats,
-  'remote-outbound-rtp': validateRemoteOutboundRtpStreamStats,
-  'media-source': validateMediaSourceStats,
-  'csrc': validateContributingSourceStats,
-  'peer-connection': validatePeerConnectionStats,
-  'data-channel': validateDataChannelStats,
-  'transport': validateTransportStats,
-  'candidate-pair': validateIceCandidatePairStats,
-  'local-candidate': validateIceCandidateStats,
-  'remote-candidate': validateIceCandidateStats,
-  'certificate': validateCertificateStats,
-  'ice-server': validateIceServerStats
-};
-
-// Validate that the stats objects in a stats report
-// follows the respective definitions.
-// Stats objects with unknown type are ignored and
-// only basic validation is done.
-function validateStatsReport(statsReport) {
-  for(const [id, stats] of statsReport.entries()) {
-    assert_equals(stats.id, id,
-      'expect stats.id to be the same as the key in statsReport');
-
-    const validator = statsValidatorTable[stats.type];
-    if(validator) {
-      validator(statsReport, stats);
-    } else {
-      validateRtcStats(statsReport, stats);
-    }
-  }
-}
-
-// Assert that the stats report have stats objects of
-// given types
-function assert_stats_report_has_stats(statsReport, statsTypes) {
-  const hasTypes = new Set([...statsReport.values()]
-    .map(stats => stats.type));
-
-  for(const type of statsTypes) {
-    assert_true(hasTypes.has(type),
-      `Expect statsReport to contain stats object of type ${type}`);
-  }
-}
-
-function findStatsFromReport(statsReport, predicate, message) {
-  for (const stats of statsReport.values()) {
-    if (predicate(stats)) {
-      return stats;
-    }
-  }
-
-  assert_unreached(message || 'none of stats in statsReport satisfy given condition')
-}
-
-// Get stats object of type that is expected to be
-// found in the statsReport
-function getRequiredStats(statsReport, type) {
-  for(const stats of statsReport.values()) {
-    if(stats.type === type) {
-      return stats;
-    }
-  }
-
-  assert_unreached(`required stats of type ${type} is not found in stats report`);
-}
-
-// Get stats object by the stats ID.
-// This is used to retreive other stats objects
-// linked to a stats object
-function getStatsById(statsReport, statsId) {
-  assert_true(statsReport.has(statsId),
-    `Expect stats report to have stats object with id ${statsId}`);
-
-  return statsReport.get(statsId);
-}
-
-// Validate an ID field in a stats object by making sure
-// that the linked stats object is found in the stats report
-// and have the type field value same as expected type
-// It doesn't validate the other fields of the linked stats
-// as validateStatsReport already does all validations
-function validateIdField(statsReport, stats, field, type) {
-  assert_string_field(stats, field);
-  const linkedStats = getStatsById(statsReport, stats[field]);
-  assert_equals(linkedStats.type, type,
-    `Expect linked stats object to have type ${type}`);
-}
-
-function validateOptionalIdField(statsReport, stats, field, type) {
-  if(stats[field] !== undefined) {
-    validateIdField(statsReport, stats, field, type);
-  }
-}
-
-/*
-  [webrtc-pc]
-  8.4.  RTCStats Dictionary
-    dictionary RTCStats {
-      required  DOMHighResTimeStamp timestamp;
-      required  RTCStatsType        type;
-      required  DOMString           id;
-    };
- */
-function validateRtcStats(statsReport, stats) {
-  assert_number_field(stats, 'timestamp');
-  assert_string_field(stats, 'type');
-  assert_string_field(stats, 'id');
-}
-
-/*
-  [webrtc-stats]
-  7.1.  RTCRtpStreamStats dictionary
-    dictionary RTCRtpStreamStats : RTCStats {
-      unsigned long       ssrc;
-      DOMString           kind;
-      DOMString           transportId;
-      DOMString           codecId;
-    };
-
-    kind of type DOMString
-      Either "audio" or "video".
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCRtpStreamStats, with attributes ssrc, kind, transportId, codecId
- */
-function validateRtpStreamStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_unsigned_int_field(stats, 'ssrc');
-  assert_string_field(stats, 'kind');
-  assert_enum_field(stats, 'kind', ['audio', 'video'])
-
-  validateIdField(statsReport, stats, 'transportId', 'transport');
-  validateIdField(statsReport, stats, 'codecId', 'codec');
-
-}
-
-/*
-  [webrtc-stats]
-  7.2.  RTCCodecStats dictionary
-    dictionary RTCCodecStats : RTCStats {
-      required unsigned long payloadType;
-      RTCCodecType  codecType;
-      required DOMString     transportId;
-      required DOMString     mimeType;
-      unsigned long clockRate;
-      unsigned long channels;
-      DOMString     sdpFmtpLine;
-    };
-
-    enum RTCCodecType {
-      "encode",
-      "decode",
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCCodecStats, with attributes payloadType, codecType, mimeType, clockRate, channels, sdpFmtpLine
- */
-
-function validateCodecStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_unsigned_int_field(stats, 'payloadType');
-  assert_optional_enum_field(stats, 'codecType', ['encode', 'decode']);
-
-  validateOptionalIdField(statsReport, stats, 'transportId', 'transport');
-
-  assert_string_field(stats, 'mimeType');
-  assert_unsigned_int_field(stats, 'clockRate');
-  if (stats.kind === 'audio') {
-    assert_unsigned_int_field(stats, 'channels');
-  }
-  assert_string_field(stats, 'sdpFmtpLine');
-}
-
-/*
-  [webrtc-stats]
-  7.3.  RTCReceivedRtpStreamStats dictionary
-    dictionary RTCReceivedRtpStreamStats : RTCRtpStreamStats {
-      unsigned long long   packetsReceived;
-      long long            packetsLost;
-      double               jitter;
-      unsigned long long   packetsDiscarded;
-      unsigned long long   packetsRepaired;
-      unsigned long long   burstPacketsLost;
-      unsigned long long   burstPacketsDiscarded;
-      unsigned long        burstLossCount;
-      unsigned long        burstDiscardCount;
-      double               burstLossRate;
-      double               burstDiscardRate;
-      double               gapLossRate;
-      double               gapDiscardRate;
-      unsigned long        framesDropped;
-      unsigned long        partialFramesLost;
-      unsigned long        fullFramesLost;
-    };
-
-    [webrtc-pc]
-    8.6.  Mandatory To Implement Stats
-      - RTCReceivedRtpStreamStats, with all required attributes from its
-        inherited dictionaries, and also attributes packetsReceived,
-        packetsLost, jitter, packetsDiscarded, framesDropped
- */
-function validateReceivedRtpStreamStats(statsReport, stats) {
-  validateRtpStreamStats(statsReport, stats);
-
-  assert_unsigned_int_field(stats, 'packetsReceived');
-  assert_unsigned_int_field(stats, 'packetsLost');
-
-  assert_number_field(stats, 'jitter');
-
-  assert_unsigned_int_field(stats, 'packetsDiscarded');
-  assert_unsigned_int_field(stats, 'framesDropped');
-
-  assert_optional_unsigned_int_field(stats, 'packetsRepaired');
-  assert_optional_unsigned_int_field(stats, 'burstPacketsLost');
-  assert_optional_unsigned_int_field(stats, 'burstPacketsDiscarded');
-  assert_optional_unsigned_int_field(stats, 'burstLossCount');
-  assert_optional_unsigned_int_field(stats, 'burstDiscardCount');
-
-  assert_optional_number_field(stats, 'burstLossRate');
-  assert_optional_number_field(stats, 'burstDiscardRate');
-  assert_optional_number_field(stats, 'gapLossRate');
-  assert_optional_number_field(stats, 'gapDiscardRate');
-
-  assert_optional_unsigned_int_field(stats, 'partialFramesLost');
-  assert_optional_unsigned_int_field(stats, 'fullFramesLost');
-}
-
-/*
-  [webrtc-stats]
-  7.4.  RTCInboundRtpStreamStats dictionary
-    dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats {
-      DOMString            trackIdentifier;
-      DOMString            remoteId;
-      unsigned long        framesDecoded;
-      unsigned long        keyFramesDecoded;
-      unsigned long        frameWidth;
-      unsigned long        frameHeight;
-      unsigned long        frameBitDepth;
-      double               framesPerSecond;
-      unsigned long long   qpSum;
-      double               totalDecodeTime;
-      double               totalInterFrameDelay;
-      double               totalSquaredInterFrameDelay;
-      boolean              voiceActivityFlag;
-      DOMHighResTimeStamp  lastPacketReceivedTimestamp;
-      double               averageRtcpInterval;
-      unsigned long long   headerBytesReceived;
-      unsigned long long   fecPacketsReceived;
-      unsigned long long   fecPacketsDiscarded;
-      unsigned long long   bytesReceived;
-      unsigned long long   packetsFailedDecryption;
-      unsigned long long   packetsDuplicated;
-      record<USVString, unsigned long long> perDscpPacketsReceived;
-      unsigned long        nackCount;
-      unsigned long        firCount;
-      unsigned long        pliCount;
-      unsigned long        sliCount;
-      DOMHighResTimeStamp  estimatedPlayoutTimestamp;
-      double        jitterBufferDelay;
-      unsigned long long   jitterBufferEmittedCount;
-      unsigned long long   totalSamplesReceived;
-      unsigned long long   samplesDecodedWithSilk;
-      unsigned long long   samplesDecodedWithCelt;
-      unsigned long long   concealedSamples;
-      unsigned long long   silentConcealedSamples;
-      unsigned long long   concealmentEvents;
-      unsigned long long   insertedSamplesForDeceleration;
-      unsigned long long   removedSamplesForAcceleration;
-      double               audioLevel;
-      double               totalAudioEnergy;
-      double               totalSamplesDuration;
-      unsigned long        framesReceived;
-      DOMString            decoderImplementation;
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCInboundRtpStreamStats, with all required attributes from its inherited
-      dictionaries, and also attributes remoteId, framesDecoded, nackCount, framesReceived, bytesReceived, totalAudioEnergy, totalSampleDuration
- */
-function validateInboundRtpStreamStats(statsReport, stats) {
-  validateReceivedRtpStreamStats(statsReport, stats);
-  assert_string_field(stats, 'trackIdentifier');
-  validateOptionalIdField(statsReport, stats, 'remoteId', 'remote-outbound-rtp');
-  assert_unsigned_int_field(stats, 'framesDecoded');
-  assert_optional_unsigned_int_field(stats, 'keyFramesDecoded');
-  assert_optional_unsigned_int_field(stats, 'frameWidth');
-  assert_optional_unsigned_int_field(stats, 'frameHeight');
-  assert_optional_unsigned_int_field(stats, 'frameBitDepth');
-  assert_optional_number_field(stats, 'framesPerSecond');
-  assert_optional_unsigned_int_field(stats, 'qpSum');
-  assert_optional_number_field(stats, 'totalDecodeTime');
-  assert_optional_number_field(stats, 'totalInterFrameDelay');
-  assert_optional_number_field(stats, 'totalSquaredInterFrameDelay');
-
-  assert_optional_boolean_field(stats, 'voiceActivityFlag');
-
-  assert_optional_number_field(stats, 'lastPacketReceivedTimeStamp');
-  assert_optional_number_field(stats, 'averageRtcpInterval');
-
-  assert_optional_unsigned_int_field(stats, 'fecPacketsReceived');
-  assert_optional_unsigned_int_field(stats, 'fecPacketsDiscarded');
-  assert_unsigned_int_field(stats, 'bytesReceived');
-  assert_optional_unsigned_int_field(stats, 'packetsFailedDecryption');
-  assert_optional_unsigned_int_field(stats, 'packetsDuplicated');
-
-  assert_optional_dict_field(stats, 'perDscpPacketsReceived');
-  if (stats['perDscpPacketsReceived']) {
-    Object.keys(stats['perDscpPacketsReceived'])
-      .forEach(k =>
-               assert_equals(typeof k, 'string', 'Expect keys of perDscpPacketsReceived to be strings')
-              );
-    Object.values(stats['perDscpPacketsReceived'])
-      .forEach(v =>
-               assert_true(Number.isInteger(v) && (v >= 0), 'Expect values of perDscpPacketsReceived to be strings')
-              );
-  }
-
-  assert_unsigned_int_field(stats, 'nackCount');
-
-  assert_optional_unsigned_int_field(stats, 'firCount');
-  assert_optional_unsigned_int_field(stats, 'pliCount');
-  assert_optional_unsigned_int_field(stats, 'sliCount');
-
-  assert_optional_number_field(stats, 'estimatedPlayoutTimestamp');
-  assert_optional_number_field(stats, 'jitterBufferDelay');
-  assert_optional_unsigned_int_field(stats, 'jitterBufferEmittedCount');
-  assert_optional_unsigned_int_field(stats, 'totalSamplesReceived');
-  assert_optional_unsigned_int_field(stats, 'samplesDecodedWithSilk');
-  assert_optional_unsigned_int_field(stats, 'samplesDecodedWithCelt');
-  assert_optional_unsigned_int_field(stats, 'concealedSamples');
-  assert_optional_unsigned_int_field(stats, 'silentConcealedSamples');
-  assert_optional_unsigned_int_field(stats, 'concealmentEvents');
-  assert_optional_unsigned_int_field(stats, 'insertedSamplesForDeceleration');
-  assert_optional_unsigned_int_field(stats, 'removedSamplesForAcceleration');
-  assert_optional_number_field(stats, 'audioLevel');
-  assert_optional_number_field(stats, 'totalAudioEnergy');
-  assert_optional_number_field(stats, 'totalSamplesDuration');
-  assert_unsigned_int_field(stats, 'framesReceived');
-  assert_optional_string_field(stats, 'decoderImplementation');
-  assert_optional_boolean_field(stats, 'powerEfficientDecoder');
-}
-
-/*
-  [webrtc-stats]
-  7.5.  RTCRemoteInboundRtpStreamStats dictionary
-    dictionary RTCRemoteInboundRtpStreamStats : RTCReceivedRtpStreamStats {
-      DOMString            localId;
-      double               roundTripTime;
-      double               totalRoundTripTime;
-      double               fractionLost;
-      unsigned long long   reportsReceived;
-      unsigned long long   roundTripTimeMeasurements;
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCRemoteInboundRtpStreamStats, with all required attributes from its
-      inherited dictionaries, and also attributes localId, roundTripTime
- */
-function validateRemoteInboundRtpStreamStats(statsReport, stats) {
-  validateReceivedRtpStreamStats(statsReport, stats);
-
-  validateIdField(statsReport, stats, 'localId', 'outbound-rtp');
-  assert_number_field(stats, 'roundTripTime');
-  assert_optional_number_field(stats, 'totalRoundTripTime');
-  assert_optional_number_field(stats, 'fractionLost');
-  assert_optional_unsigned_int_field(stats, 'reportsReceived');
-  assert_optional_unsigned_int_field(stats, 'roundTripTimeMeasurements');
-}
-
-/*
-  [webrtc-stats]
-  7.6.  RTCSentRtpStreamStats dictionary
-    dictionary RTCSentRtpStreamStats : RTCRtpStreamStats {
-      unsigned long      packetsSent;
-      unsigned long long bytesSent;
-    };
-
-    [webrtc-pc]
-    8.6.  Mandatory To Implement Stats
-      - RTCSentRtpStreamStats, with all required attributes from its inherited
-        dictionaries, and also attributes packetsSent, bytesSent
- */
-function validateSentRtpStreamStats(statsReport, stats) {
-  validateRtpStreamStats(statsReport, stats);
-
-  assert_unsigned_int_field(stats, 'packetsSent');
-  assert_unsigned_int_field(stats, 'bytesSent');
-}
-
-/*
-  [webrtc-stats]
-  7.7.  RTCOutboundRtpStreamStats dictionary
-    dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
-      DOMString            mediaSourceId;
-      DOMString            remoteId;
-      DOMString            rid;
-      DOMHighResTimeStamp  lastPacketSentTimestamp;
-      unsigned long long   headerBytesSent;
-      unsigned long        packetsDiscardedOnSend;
-      unsigned long long   bytesDiscardedOnSend;
-      unsigned long        fecPacketsSent;
-      unsigned long long   retransmittedPacketsSent;
-      unsigned long long   retransmittedBytesSent;
-      double               targetBitrate;
-      unsigned long long   totalEncodedBytesTarget;
-      unsigned long        frameWidth;
-      unsigned long        frameHeight;
-      unsigned long        frameBitDepth;
-      double               framesPerSecond;
-      unsigned long        framesSent;
-      unsigned long        hugeFramesSent;
-      unsigned long        framesEncoded;
-      unsigned long        keyFramesEncoded;
-      unsigned long        framesDiscardedOnSend;
-      unsigned long long   qpSum;
-      unsigned long long   totalSamplesSent;
-      unsigned long long   samplesEncodedWithSilk;
-      unsigned long long   samplesEncodedWithCelt;
-      boolean              voiceActivityFlag;
-      double               totalEncodeTime;
-      double               totalPacketSendDelay;
-      double               averageRtcpInterval;
-      RTCQualityLimitationReason          qualityLimitationReason;
-      record<DOMString, double> qualityLimitationDurations;
-      unsigned long        qualityLimitationResolutionChanges;
-      record<USVString, unsigned long long> perDscpPacketsSent;
-      unsigned long        nackCount;
-      unsigned long        firCount;
-      unsigned long        pliCount;
-      unsigned long        sliCount;
-      DOMString            encoderImplementation;
-    };
-    [webrtc-pc]
-    8.6.  Mandatory To Implement Stats
-      - RTCOutboundRtpStreamStats, with all required attributes from its
-        inherited dictionaries, and also attributes remoteId, framesEncoded, nackCount, framesSent
- */
-function validateOutboundRtpStreamStats(statsReport, stats) {
-  validateSentRtpStreamStats(statsReport, stats)
-
-  validateOptionalIdField(statsReport, stats, 'mediaSourceId', 'media-source');
-  validateOptionalIdField(statsReport, stats, 'remoteId', 'remote-inbound-rtp');
-
-  assert_optional_string_field(stats, 'rid');
-
-  assert_optional_number_field(stats, 'lastPacketSentTimestamp');
-  assert_optional_unsigned_int_field(stats, 'headerBytesSent');
-  assert_optional_unsigned_int_field(stats, 'packetsDiscardedOnSend');
-  assert_optional_unsigned_int_field(stats, 'bytesDiscardedOnSend');
-  assert_optional_unsigned_int_field(stats, 'fecPacketsSent');
-  assert_optional_unsigned_int_field(stats, 'retransmittedPacketsSent');
-  assert_optional_unsigned_int_field(stats, 'retransmittedBytesSent');
-  assert_optional_number_field(stats, 'targetBitrate');
-  assert_optional_unsigned_int_field(stats, 'totalEncodedBytesTarget');
-  if (stats['kind'] === 'video') {
-    assert_optional_unsigned_int_field(stats, 'frameWidth');
-    assert_optional_unsigned_int_field(stats, 'frameHeight');
-    assert_optional_unsigned_int_field(stats, 'frameBitDepth');
-    assert_optional_number_field(stats, 'framesPerSecond');
-    assert_unsigned_int_field(stats, 'framesSent');
-    assert_optional_unsigned_int_field(stats, 'hugeFramesSent');
-    assert_unsigned_int_field(stats, 'framesEncoded');
-    assert_optional_unsigned_int_field(stats, 'keyFramesEncoded');
-    assert_optional_unsigned_int_field(stats, 'framesDiscardedOnSend');
-    assert_optional_unsigned_int_field(stats, 'qpSum');
-  } else   if (stats['kind'] === 'audio') {
-    assert_optional_unsigned_int_field(stats, 'totalSamplesSent');
-    assert_optional_unsigned_int_field(stats, 'samplesEncodedWithSilk');
-    assert_optional_unsigned_int_field(stats, 'samplesEncodedWithCelt');
-    assert_optional_boolean_field(stats, 'voiceActivityFlag');
-  }
-  assert_optional_number_field(stats, 'totalEncodeTime');
-  assert_optional_number_field(stats, 'totalPacketSendDelay');
-  assert_optional_number_field(stats, 'averageRTCPInterval');
-
-  if (stats['kind'] === 'video') {
-    assert_optional_enum_field(stats, 'qualityLimitationReason', ['none', 'cpu', 'bandwidth', 'other']);
-
-    assert_optional_dict_field(stats, 'qualityLimitationDurations');
-    if (stats['qualityLimitationDurations']) {
-      Object.keys(stats['qualityLimitationDurations'])
-        .forEach(k =>
-                 assert_equals(typeof k, 'string', 'Expect keys of qualityLimitationDurations to be strings')
-                );
-      Object.values(stats['qualityLimitationDurations'])
-        .forEach(v =>
-                 assert_equals(typeof num, 'number', 'Expect values of qualityLimitationDurations to be numbers')
-                );
-    }
-
-    assert_optional_unsigned_int_field(stats, 'qualityLimitationResolutionChanges');
-    }
-  assert_unsigned_int_field(stats, 'nackCount');
-  assert_optional_dict_field(stats, 'perDscpPacketsSent');
-  if (stats['perDscpPacketsSent']) {
-    Object.keys(stats['perDscpPacketsSent'])
-      .forEach(k =>
-               assert_equals(typeof k, 'string', 'Expect keys of perDscpPacketsSent to be strings')
-              );
-    Object.values(stats['perDscpPacketsSent'])
-      .forEach(v =>
-               assert_true(Number.isInteger(v) && (v >= 0), 'Expect values of perDscpPacketsSent to be strings')
-              );
-  }
-
-  assert_optional_unsigned_int_field(stats, 'firCount');
-  assert_optional_unsigned_int_field(stats, 'pliCount');
-  assert_optional_unsigned_int_field(stats, 'sliCount');
-  assert_optional_string_field(stats, 'encoderImplementation');
-  assert_optional_boolean_field(stats, 'powerEfficientEncoder');
-  assert_optional_string_field(stats, 'scalabilityMode');
-}
-
-/*
-  [webrtc-stats]
-  7.8.  RTCRemoteOutboundRtpStreamStats dictionary
-    dictionary RTCRemoteOutboundRtpStreamStats : RTCSentRtpStreamStats {
-      DOMString           localId;
-      DOMHighResTimeStamp remoteTimestamp;
-      unsigned long long  reportsSent;
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCRemoteOutboundRtpStreamStats, with all required attributes from its
-      inherited dictionaries, and also attributes localId, remoteTimestamp
- */
-function validateRemoteOutboundRtpStreamStats(statsReport, stats) {
-  validateSentRtpStreamStats(statsReport, stats);
-
-  validateIdField(statsReport, stats, 'localId', 'inbound-rtp');
-  assert_number_field(stats, 'remoteTimeStamp');
-  assert_optional_unsigned_int_field(stats, 'reportsSent');
-}
-
-/*
-  [webrtc-stats]
-  7.11 RTCMediaSourceStats dictionary
-  dictionary RTCMediaSourceStats : RTCStats {
-      DOMString       trackIdentifier;
-      DOMString       kind;
-  };
-
-  dictionary RTCAudioSourceStats : RTCMediaSourceStats {
-       double       audioLevel;
-       double       totalAudioEnergy;
-       double       totalSamplesDuration;
-       double       echoReturnLoss;
-       double       echoReturnLossEnhancement;
-  };
-
-  dictionary RTCVideoSourceStats : RTCMediaSourceStats {
-      unsigned long   width;
-      unsigned long   height;
-      unsigned long   bitDepth;
-      unsigned long   frames;
-      // see https://github.com/w3c/webrtc-stats/issues/540
-      double   framesPerSecond;
-  };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-  RTCMediaSourceStats with attributes trackIdentifier, kind
-  RTCAudioSourceStats, with all required attributes from its inherited dictionaries and totalAudioEnergy, totalSamplesDuration
-  RTCVideoSourceStats, with all required attributes from its inherited dictionaries and width, height, framesPerSecond
-*/
-function validateMediaSourceStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-  assert_string_field(stats, 'trackIdentifier');
-  assert_enum_field(stats, 'kind', ['audio', 'video']);
-
-  if (stats.kind === 'audio') {
-    assert_optional_number_field(stats, 'audioLevel');
-    assert_number_field(stats, 'totalAudioEnergy');
-    assert_number_field(stats, 'totalSamplesDuration');
-    assert_optional_number_field(stats, 'echoReturnLoss');
-    assert_optional_number_field(stats, 'echoReturnLossEnhancement');
-  } else if (stats.kind === 'video') {
-    assert_unsigned_int_field(stats, 'width');
-    assert_unsigned_int_field(stats, 'height');
-    assert_optional_unsigned_int_field(stats, 'bitDpeth');
-    assert_optional_unsigned_int_field(stats, 'frames');
-    assert_number_field(stats, 'framesPerSecond');
-  }
-}
-
-/*
-  [webrtc-stats]
-  7.9.  RTCRTPContributingSourceStats
-    dictionary RTCRTPContributingSourceStats : RTCStats {
-      unsigned long contributorSsrc;
-      DOMString     inboundRtpStreamId;
-      unsigned long packetsContributedTo;
-      double        audioLevel;
-    };
- */
-function validateContributingSourceStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_optional_unsigned_int_field(stats, 'contributorSsrc');
-
-  validateOptionalIdField(statsReport, stats, 'inboundRtpStreamId', 'inbound-rtp');
-  assert_optional_unsigned_int_field(stats, 'packetsContributedTo');
-  assert_optional_number_field(stats, 'audioLevel');
-}
-
-/*
-  [webrtc-stats]
-  7.10. RTCPeerConnectionStats dictionary
-    dictionary RTCPeerConnectionStats : RTCStats {
-      unsigned long dataChannelsOpened;
-      unsigned long dataChannelsClosed;
-      unsigned long dataChannelsRequested;
-      unsigned long dataChannelsAccepted;
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCPeerConnectionStats, with attributes dataChannelsOpened, dataChannelsClosed
- */
-function validatePeerConnectionStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_unsigned_int_field(stats, 'dataChannelsOpened');
-  assert_unsigned_int_field(stats, 'dataChannelsClosed');
-  assert_optional_unsigned_int_field(stats, 'dataChannelsRequested');
-  assert_optional_unsigned_int_field(stats, 'dataChannelsAccepted');
-}
-
-/*
-  [webrtc-stats]
-  7.13. RTCDataChannelStats dictionary
-    dictionary RTCDataChannelStats : RTCStats {
-      DOMString           label;
-      DOMString           protocol;
-      // see https://github.com/w3c/webrtc-stats/issues/541
-      unsigned short      dataChannelIdentifier;
-      DOMString           transportId;
-      RTCDataChannelState state;
-      unsigned long       messagesSent;
-      unsigned long long  bytesSent;
-      unsigned long       messagesReceived;
-      unsigned long long  bytesReceived;
-    };
-
-  [webrtc-pc]
-  6.2. RTCDataChannel
-    enum RTCDataChannelState {
-      "connecting",
-      "open",
-      "closing",
-      "closed"
-    };
-
-  8.6.  Mandatory To Implement Stats
-    - RTCDataChannelStats, with attributes label, protocol, datachannelIdentifier, state,
-      messagesSent, bytesSent, messagesReceived, bytesReceived
- */
-function validateDataChannelStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_string_field(stats, 'label');
-  assert_string_field(stats, 'protocol');
-  assert_unsigned_int_field(stats, 'dataChannelIdentifier');
-
-  validateOptionalIdField(statsReport, stats, 'transportId', 'transport');
-
-  assert_enum_field(stats, 'state',
-    ['connecting', 'open', 'closing', 'closed']);
-
-  assert_unsigned_int_field(stats, 'messagesSent');
-  assert_unsigned_int_field(stats, 'bytesSent');
-  assert_unsigned_int_field(stats, 'messagesReceived');
-  assert_unsigned_int_field(stats, 'bytesReceived');
-}
-
-/*
-  [webrtc-stats]
-  7.14. RTCTransportStats dictionary
-    dictionary RTCTransportStats : RTCStats {
-      unsigned long long    packetsSent;
-      unsigned long long    packetsReceived;
-      unsigned long long    bytesSent;
-      unsigned long long    bytesReceived;
-      DOMString             rtcpTransportStatsId;
-      RTCIceRole            iceRole;
-      RTCDtlsTransportState dtlsState;
-      DOMString             selectedCandidatePairId;
-      DOMString             localCertificateId;
-      DOMString             remoteCertificateId;
-      DOMString             tlsVersion;
-      DOMString             dtlsCipher;
-      DOMString             srtpCipher;
-      DOMString             tlsGroup;
-      unsigned long         selectedCandidatePairChanges;
-    };
-
-  [webrtc-pc]
-  5.5.  RTCDtlsTransportState Enum
-    enum RTCDtlsTransportState {
-      "new",
-      "connecting",
-      "connected",
-      "closed",
-      "failed"
-    };
-
-  5.6.  RTCIceRole Enum
-    enum RTCIceRole {
-      "unknown",
-      "controlling",
-      "controlled"
-    };
-
-  8.6.  Mandatory To Implement Stats
-    - RTCTransportStats, with attributes bytesSent, bytesReceived,
-      selectedCandidatePairId, localCertificateId,
-      remoteCertificateId
- */
-function validateTransportStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_optional_unsigned_int_field(stats, 'packetsSent');
-  assert_optional_unsigned_int_field(stats, 'packetsReceived');
-  assert_unsigned_int_field(stats, 'bytesSent');
-  assert_unsigned_int_field(stats, 'bytesReceived');
-
-  validateOptionalIdField(statsReport, stats, 'rtcpTransportStatsId',
-                          'transport');
-
-  assert_optional_enum_field(stats, 'iceRole',
-                             ['unknown', 'controlling', 'controlled']);
-
-  assert_optional_enum_field(stats, 'dtlsState',
-    ['new', 'connecting', 'connected', 'closed', 'failed']);
-
-  validateIdField(statsReport, stats, 'selectedCandidatePairId', 'candidate-pair');
-  validateIdField(statsReport, stats, 'localCertificateId', 'certificate');
-  validateIdField(statsReport, stats, 'remoteCertificateId', 'certificate');
-  assert_optional_string_field(stats, 'tlsVersion');
-  assert_optional_string_field(stats, 'dtlsCipher');
-  assert_optional_string_field(stats, 'srtpCipher');
-  assert_optional_string_field(stats, 'tlsGroup');
-  assert_optional_unsigned_int_field(stats, 'selectedCandidatePairChanges');
-}
-
-/*
-  [webrtc-stats]
-  7.15. RTCIceCandidateStats dictionary
-    dictionary RTCIceCandidateStats : RTCStats {
-      required DOMString  transportId;
-      DOMString?          address;
-      long                port;
-      DOMString           protocol;
-      RTCIceCandidateType candidateType;
-      long                priority;
-      DOMString           url;
-      DOMString           relayProtocol;
-    };
-
-  [webrtc-pc]
-  4.8.1.3.  RTCIceCandidateType Enum
-    enum RTCIceCandidateType {
-      "host",
-      "srflx",
-      "prflx",
-      "relay"
-    };
-
-  8.6.  Mandatory To Implement Stats
-    - RTCIceCandidateStats, with attributes address, port, protocol, candidateType, url
- */
-function validateIceCandidateStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  validateIdField(statsReport, stats, 'transportId', 'transport');
-  // The address is mandatory to implement, but is allowed to be null
-  // when hidden for privacy reasons.
-  if (stats.address != null) {
-    // Departure from strict spec reading:
-    // This field is populated in a racy manner in Chrome.
-    // We allow it to be present or not present for the time being.
-    // TODO(https://bugs.chromium.org/1092721): Become consistent.
-    assert_optional_string_field(stats, 'address');
-  }
-  assert_unsigned_int_field(stats, 'port');
-  assert_string_field(stats, 'protocol');
-
-  assert_enum_field(stats, 'candidateType',
-    ['host', 'srflx', 'prflx', 'relay']);
-
-  assert_optional_int_field(stats, 'priority');
-  // The url field is mandatory for local candidates gathered from
-  // a STUN or TURN server, and MUST NOT be present otherwise.
-  // TODO(hta): Improve checking.
-  assert_optional_string_field(stats, 'url');
-  assert_optional_string_field(stats, 'relayProtocol');
-}
-
-/*
-  [webrtc-stats]
-  7.16. RTCIceCandidatePairStats dictionary
-    dictionary RTCIceCandidatePairStats : RTCStats {
-      DOMString                     transportId;
-      DOMString                     localCandidateId;
-      DOMString                     remoteCandidateId;
-      RTCStatsIceCandidatePairState state;
-      boolean                       nominated;
-      unsigned long                 packetsSent;
-      unsigned long                 packetsReceived;
-      unsigned long long            bytesSent;
-      unsigned long long            bytesReceived;
-      DOMHighResTimeStamp           lastPacketSentTimestamp;
-      DOMHighResTimeStamp           lastPacketReceivedTimestamp;
-      DOMHighResTimeStamp           firstRequestTimestamp;
-      DOMHighResTimeStamp           lastRequestTimestamp;
-      DOMHighResTimeStamp           lastResponseTimestamp;
-      double                        totalRoundTripTime;
-      double                        currentRoundTripTime;
-      double                        availableOutgoingBitrate;
-      double                        availableIncomingBitrate;
-      unsigned long                 circuitBreakerTriggerCount;
-      unsigned long long            requestsReceived;
-      unsigned long long            requestsSent;
-      unsigned long long            responsesReceived;
-      unsigned long long            responsesSent;
-      unsigned long long            retransmissionsReceived;
-      unsigned long long            retransmissionsSent;
-      unsigned long long            consentRequestsSent;
-      DOMHighResTimeStamp           consentExpiredTimestamp;
-      unsigned long                 packetsDiscardedOnSend;
-      unsigned long long            bytesDiscardedOnSend;    };
-
-    enum RTCStatsIceCandidatePairState {
-      "frozen",
-      "waiting",
-      "in-progress",
-      "failed",
-      "succeeded"
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCIceCandidatePairStats, with attributes transportId, localCandidateId,
-      remoteCandidateId, state, nominated, bytesSent, bytesReceived, totalRoundTripTime, currentRoundTripTime
-   // not including priority per https://github.com/w3c/webrtc-pc/issues/2457
- */
-function validateIceCandidatePairStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  validateIdField(statsReport, stats, 'transportId', 'transport');
-  validateIdField(statsReport, stats, 'localCandidateId', 'local-candidate');
-  validateIdField(statsReport, stats, 'remoteCandidateId', 'remote-candidate');
-
-  assert_enum_field(stats, 'state',
-    ['frozen', 'waiting', 'in-progress', 'failed', 'succeeded']);
-
-  assert_boolean_field(stats, 'nominated');
-  assert_optional_unsigned_int_field(stats, 'packetsSent');
-  assert_optional_unsigned_int_field(stats, 'packetsReceived');
-  assert_unsigned_int_field(stats, 'bytesSent');
-  assert_unsigned_int_field(stats, 'bytesReceived');
-
-  assert_optional_number_field(stats, 'lastPacketSentTimestamp');
-  assert_optional_number_field(stats, 'lastPacketReceivedTimestamp');
-  assert_optional_number_field(stats, 'firstRequestTimestamp');
-  assert_optional_number_field(stats, 'lastRequestTimestamp');
-  assert_optional_number_field(stats, 'lastResponseTimestamp');
-
-  assert_number_field(stats, 'totalRoundTripTime');
-  assert_number_field(stats, 'currentRoundTripTime');
-
-  assert_optional_number_field(stats, 'availableOutgoingBitrate');
-  assert_optional_number_field(stats, 'availableIncomingBitrate');
-
-  assert_optional_unsigned_int_field(stats, 'circuitBreakerTriggerCount');
-  assert_optional_unsigned_int_field(stats, 'requestsReceived');
-  assert_optional_unsigned_int_field(stats, 'requestsSent');
-  assert_optional_unsigned_int_field(stats, 'responsesReceived');
-  assert_optional_unsigned_int_field(stats, 'responsesSent');
-  assert_optional_unsigned_int_field(stats, 'retransmissionsReceived');
-  assert_optional_unsigned_int_field(stats, 'retransmissionsSent');
-  assert_optional_unsigned_int_field(stats, 'consentRequestsSent');
-  assert_optional_number_field(stats, 'consentExpiredTimestamp');
-  assert_optional_unsigned_int_field(stats, 'packetsDiscardedOnSend');
-  assert_optional_unsigned_int_field(stats, 'bytesDiscardedOnSend');
-}
-
-/*
-  [webrtc-stats]
-  7.17. RTCCertificateStats dictionary
-    dictionary RTCCertificateStats : RTCStats {
-      DOMString fingerprint;
-      DOMString fingerprintAlgorithm;
-      DOMString base64Certificate;
-      DOMString issuerCertificateId;
-    };
-
-  [webrtc-pc]
-  8.6.  Mandatory To Implement Stats
-    - RTCCertificateStats, with attributes fingerprint, fingerprintAlgorithm,
-      base64Certificate, issuerCertificateId
- */
-function validateCertificateStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_string_field(stats, 'fingerprint');
-  assert_string_field(stats, 'fingerprintAlgorithm');
-  assert_string_field(stats, 'base64Certificate');
-  assert_optional_string_field(stats, 'issuerCertificateId');
-}
-
-/*
-  [webrtc-stats]
-  7.30. RTCIceServerStats dictionary
-  dictionary RTCIceServerStats : RTCStats {
-      DOMString url;
-      long port;
-      DOMString protocol;
-      unsigned long totalRequestsSent;
-      unsigned long totalResponsesReceived;
-      double totalRoundTripTime;
-    };
-*/
-function validateIceServerStats(statsReport, stats) {
-  validateRtcStats(statsReport, stats);
-
-  assert_optional_string_field(stats, 'url');
-  assert_optional_int_field(stats, 'port');
-  assert_optional_string_field(stats, 'protocol');
-  assert_optional_unsigned_int_field(stats, 'totalRequestsSent');
-  assert_optional_unsigned_int_field(stats, 'totalResponsesReceived');
-  assert_optional_number_field(stats, 'totalRoundTripTime');
-}
diff --git a/tests/wpt/tests/webrtc/protocol/crypto-suite.https.html b/tests/wpt/tests/webrtc/protocol/crypto-suite.https.html
index 2c8b1f6491d..c3941e409ff 100644
--- a/tests/wpt/tests/webrtc/protocol/crypto-suite.https.html
+++ b/tests/wpt/tests/webrtc/protocol/crypto-suite.https.html
@@ -4,7 +4,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="../RTCPeerConnection-helper.js"></script>
-<script src="../RTCStats-helper.js"></script>
 <script>
 'use strict';
 
@@ -56,8 +55,7 @@ for (const name of Object.keys(acceptableValues)) {
     await exchangeOfferAnswer(pc1, pc2);
     await waitForState(pc1.sctp.transport, 'connected');
     const statsReport = await pc1.getStats();
-    const transportStats = findStatsFromReport(statsReport,
-                                               stats => stats.type === 'transport')
+    const transportStats = [...statsReport.values()].find(({type}) => type === 'transport');
     verifyStat(name, transportStats);
   }, name + ' is acceptable on data-only');
 
@@ -72,8 +70,7 @@ for (const name of Object.keys(acceptableValues)) {
     await exchangeOfferAnswer(pc1, pc2);
     await waitForState(transceiver.sender.transport, 'connected');
     const statsReport = await pc1.getStats();
-    const transportStats = findStatsFromReport(statsReport,
-                                               stats => stats.type === 'transport')
+    const transportStats = [...statsReport.values()].find(({type}) => type === 'transport');
     verifyStat(name, transportStats);
   }, name + ' is acceptable on video-only');
 }
diff --git a/tests/wpt/tests/websockets/stream/tentative/close.any.js b/tests/wpt/tests/websockets/stream/tentative/close.any.js
index 2be9034872e..098caf31c82 100644
--- a/tests/wpt/tests/websockets/stream/tentative/close.any.js
+++ b/tests/wpt/tests/websockets/stream/tentative/close.any.js
@@ -4,12 +4,14 @@
 // META: variant=?wss
 // META: variant=?wpt_flags=h2
 
+'use strict';
+
 promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   await wss.opened;
-  wss.close({code: 3456, reason: 'pizza'});
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 3456, 'code should match');
+  wss.close({ closeCode: 3456, reason: 'pizza' });
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 3456, 'code should match');
   assert_equals(reason, 'pizza', 'reason should match');
 }, 'close code should be sent to server and reflected back');
 
@@ -17,8 +19,8 @@ promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   await wss.opened;
   wss.close();
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 1005, 'code should be unset');
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 1005, 'code should be unset');
   assert_equals(reason, '', 'reason should be empty');
 }, 'no close argument should send empty Close frame');
 
@@ -26,8 +28,8 @@ promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   await wss.opened;
   wss.close({});
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 1005, 'code should be unset');
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 1005, 'code should be unset');
   assert_equals(reason, '', 'reason should be empty');
 }, 'unspecified close code should send empty Close frame');
 
@@ -35,8 +37,8 @@ promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   await wss.opened;
   wss.close({reason: ''});
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 1005, 'code should be unset');
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 1005, 'code should be unset');
   assert_equals(reason, '', 'reason should be empty');
 }, 'unspecified close code with empty reason should send empty Close frame');
 
@@ -44,8 +46,8 @@ promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   await wss.opened;
   wss.close({reason: 'non-empty'});
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 1000, 'code should be set');
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 1000, 'code should be set');
   assert_equals(reason, 'non-empty', 'reason should match');
 }, 'unspecified close code with non-empty reason should set code to 1000');
 
@@ -61,17 +63,19 @@ promise_test(async () => {
   await wss.opened;
   const reason = '.'.repeat(124);
   assert_throws_dom('SyntaxError', () => wss.close({ reason }),
-                    'close should throw a TypeError');
+                    'close should throw a SyntaxError');
 }, 'close() with an overlong reason should throw');
 
+function IsWebSocketError(e) {
+  return e.constructor == WebSocketError;
+}
+
 promise_test(t => {
   const wss = new WebSocketStream(ECHOURL);
   wss.close();
   return Promise.all([
-    promise_rejects_dom(
-        t, 'NetworkError', wss.opened, 'opened promise should reject'),
-    promise_rejects_dom(
-        t, 'NetworkError', wss.closed, 'closed promise should reject'),
+    wss.opened.then(t.unreached_func('should have rejected')).catch(e => assert_true(IsWebSocketError(e))),
+    wss.closed.then(t.unreached_func('should have rejected')).catch(e => assert_true(IsWebSocketError(e))),
   ]);
 }, 'close during handshake should work');
 
@@ -79,8 +83,8 @@ for (const invalidCode of [999, 1001, 2999, 5000]) {
   promise_test(async () => {
     const wss = new WebSocketStream(ECHOURL);
     await wss.opened;
-    assert_throws_dom('InvalidAccessError', () => wss.close({ code: invalidCode }),
-                      'close should throw a TypeError');
+    assert_throws_dom('InvalidAccessError', () => wss.close({ closeCode: invalidCode }),
+                      'close should throw an InvalidAccessError');
   }, `close() with invalid code ${invalidCode} should throw`);
 }
 
@@ -88,8 +92,8 @@ promise_test(async () => {
   const wss = new WebSocketStream(ECHOURL);
   const { writable } = await wss.opened;
   writable.getWriter().close();
-  const { code, reason } = await wss.closed;
-  assert_equals(code, 1005, 'code should be unset');
+  const { closeCode, reason } = await wss.closed;
+  assert_equals(closeCode, 1005, 'code should be unset');
   assert_equals(reason, '', 'reason should be empty');
 }, 'closing the writable should result in a clean close');
 
@@ -123,65 +127,57 @@ for (const { method, voweling, stream } of abortOrCancel) {
     const wss = new WebSocketStream(ECHOURL);
     const info = await wss.opened;
     info[stream][method]();
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 1005, 'code should be unset');
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 1005, 'code should be unset');
     assert_equals(reason, '', 'reason should be empty');
   }, `${voweling} the ${stream} should result in a clean close`);
 
   promise_test(async () => {
     const wss = new WebSocketStream(ECHOURL);
     const info = await wss.opened;
-    info[stream][method]({ code: 3333 });
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 3333, 'code should be used');
+    info[stream][method]({ closeCode: 3333, reason: 'obsolete' });
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with attributes not wrapped in a WebSocketError should be ignored`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.opened;
+    info[stream][method](new WebSocketError('', { closeCode: 3333 }));
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 3333, 'code should be used');
     assert_equals(reason, '', 'reason should be empty');
   }, `${voweling} the ${stream} with a code should send that code`);
 
   promise_test(async () => {
     const wss = new WebSocketStream(ECHOURL);
     const info = await wss.opened;
-    info[stream][method]({ code: 3456, reason: 'set' });
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 3456, 'code should be used');
+    info[stream][method](new WebSocketError('', { closeCode: 3456, reason: 'set' }));
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 3456, 'code should be used');
     assert_equals(reason, 'set', 'reason should be used');
   }, `${voweling} the ${stream} with a code and reason should use them`);
 
   promise_test(async () => {
     const wss = new WebSocketStream(ECHOURL);
     const info = await wss.opened;
-    info[stream][method]({ reason: 'specified' });
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 1005, 'code should be unset');
-    assert_equals(reason, '', 'reason should be empty');
-  }, `${voweling} the ${stream} with a reason but no code should be ignored`);
+    info[stream][method](new WebSocketError('', { reason: 'specified' }));
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 1000, 'code should be defaulted');
+    assert_equals(reason, 'specified', 'reason should be used');
+  }, `${voweling} the ${stream} with a reason but no code should default the close code`);
 
   promise_test(async () => {
     const wss = new WebSocketStream(ECHOURL);
     const info = await wss.opened;
-    info[stream][method]({ code: 999 });
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 1005, 'code should be unset');
+    const domException = new DOMException('yes', 'DataCloneError');
+    domException.closeCode = 1000;
+    domException.reason = 'should be ignored';
+    info[stream][method](domException);
+    const { closeCode, reason } = await wss.closed;
+    assert_equals(closeCode, 1005, 'code should be unset');
     assert_equals(reason, '', 'reason should be empty');
-  }, `${voweling} the ${stream} with an invalid code should be ignored`);
-
-  promise_test(async () => {
-    const wss = new WebSocketStream(ECHOURL);
-    const info = await wss.opened;
-    info[stream][method]({ code: 1000, reason: 'x'.repeat(128) });
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 1005, 'code should be unset');
-    assert_equals(reason, '', 'reason should be empty');
-  }, `${voweling} the ${stream} with an invalid reason should be ignored`);
-
-  // DOMExceptions are only ignored because the |code| attribute is too small to
-  // be a valid WebSocket close code.
-  promise_test(async () => {
-    const wss = new WebSocketStream(ECHOURL);
-    const info = await wss.opened;
-    info[stream][method](new DOMException('yes', 'DataCloneError'));
-    const { code, reason } = await wss.closed;
-    assert_equals(code, 1005, 'code should be unset');
-    assert_equals(reason, '', 'reason should be empty');
-  }, `${voweling} the ${stream} with a DOMException should be ignored`);
+  }, `${voweling} the ${stream} with a DOMException not set code or reason`);
 
 }
diff --git a/tests/wpt/tests/websockets/stream/tentative/constructor.any.js b/tests/wpt/tests/websockets/stream/tentative/constructor.any.js
index 4d67d81cf28..66df9743035 100644
--- a/tests/wpt/tests/websockets/stream/tentative/constructor.any.js
+++ b/tests/wpt/tests/websockets/stream/tentative/constructor.any.js
@@ -44,11 +44,15 @@ promise_test(async () => {
   wss.close();
 }, 'setting a protocol in the constructor should work');
 
+function IsWebSocketError(e) {
+  return e.constructor == WebSocketError;
+}
+
 promise_test(t => {
   const wss = new WebSocketStream(`${BASEURL}/404`);
   return Promise.all([
-    promise_rejects_dom(t, 'NetworkError', wss.opened, 'opened should reject'),
-    promise_rejects_dom(t, 'NetworkError', wss.closed, 'closed should reject'),
+    wss.opened.then(t.unreached_func('should have rejected')).catch(e => assert_true(IsWebSocketError(e))),
+    wss.closed.then(t.unreached_func('should have rejected')).catch(e => assert_true(IsWebSocketError(e))),
   ]);
 }, 'connection failure should reject the promises');
 
diff --git a/tests/wpt/tests/websockets/stream/tentative/websocket-error.any.js b/tests/wpt/tests/websockets/stream/tentative/websocket-error.any.js
new file mode 100644
index 00000000000..b114bbb3e34
--- /dev/null
+++ b/tests/wpt/tests/websockets/stream/tentative/websocket-error.any.js
@@ -0,0 +1,50 @@
+// META: global=window,worker
+
+'use strict';
+
+test(() => {
+  const error = new WebSocketError();
+  assert_equals(error.code, 0, 'DOMException code should be 0');
+  assert_equals(error.name, 'WebSocketError', 'name should be correct');
+  assert_equals(error.message, '', 'DOMException message should be empty');
+  assert_equals(error.closeCode, null, 'closeCode should be null');
+  assert_equals(error.reason, '', 'reason should be empty');
+}, 'WebSocketError defaults should be correct');
+
+test(() => {
+  const error = new WebSocketError('message', { closeCode: 3456, reason: 'reason' });
+  assert_equals(error.code, 0, 'DOMException code should be 0');
+  assert_equals(error.name, 'WebSocketError', 'name should be correct');
+  assert_equals(error.message, 'message', 'DOMException message should be set');
+  assert_equals(error.closeCode, 3456, 'closeCode should match');
+  assert_equals(error.reason, 'reason', 'reason should match');
+}, 'WebSocketError should be initialised from arguments');
+
+for (const invalidCode of [999, 1001, 2999, 5000]) {
+  test(() => {
+    assert_throws_dom('InvalidAccessError', () => new WebSocketError('', { closeCode: invalidCode }),
+                      'invalid code should throw an InvalidAccessError');
+  }, `new WebSocketError with invalid code ${invalidCode} should throw`);
+}
+
+test(() => {
+  const error = new WebSocketError('', { closeCode: 3333 });
+  assert_equals(error.closeCode, 3333, 'code should be used');
+  assert_equals(error.reason, '', 'reason should be empty');
+}, 'passing only close code to WebSocketError should work');
+
+test(() => {
+  const error = new WebSocketError('', { reason: 'specified' });
+  assert_equals(error.closeCode, 1000, 'code should be defaulted');
+  assert_equals(error.reason, 'specified', 'reason should be used');
+}, 'passing a non-empty reason should cause the close code to be set to 1000');
+
+test(() => {
+  assert_throws_dom('SyntaxError', () => new WebSocketError('', { closeCode: 1000, reason: 'x'.repeat(124) }),
+                    'overlong reason should trigger SyntaxError');
+}, 'overlong reason should throw');
+
+test(() => {
+  assert_throws_dom('SyntaxError', () => new WebSocketError('', { reason: '🔌'.repeat(32) }),
+                    'overlong reason should throw');
+}, 'reason should be rejected based on utf-8 bytes, not character count');
diff --git a/tests/wpt/tests/workers/same-site-cookies/first-party.all.tentative.https.window.js b/tests/wpt/tests/workers/same-site-cookies/first-party.all.tentative.https.window.js
new file mode 100644
index 00000000000..d7e5f2ee42c
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/first-party.all.tentative.https.window.js
@@ -0,0 +1,19 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (window) Set up listener for "DidStart" message and start worker.
+// Step 2 (worker) Send "DidStart" message to window.
+// Step 3 (window) Receive "DidStart" message and cleanup.
+
+async_test(t => {
+    // Step 1
+    const worker = new SharedWorker("/workers/same-site-cookies/resources/worker.js", {sameSiteCookies: "all"});
+    worker.port.onmessage = t.step_func(e => {
+        // Step 3
+        assert_equals(e.data, "DidStart", "Worker should have started");
+        t.done();
+    });
+}, "Check SharedWorker sameSiteCookies option all for first-party");
diff --git a/tests/wpt/tests/workers/same-site-cookies/first-party.default.tentative.https.window.js b/tests/wpt/tests/workers/same-site-cookies/first-party.default.tentative.https.window.js
new file mode 100644
index 00000000000..b120014c1a8
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/first-party.default.tentative.https.window.js
@@ -0,0 +1,19 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (window) Set up listener for "DidStart" message and start worker.
+// Step 2 (worker) Send "DidStart" message to window.
+// Step 3 (window) Receive "DidStart" message and cleanup.
+
+async_test(t => {
+    // Step 1
+    const worker = new SharedWorker("/workers/same-site-cookies/resources/worker.js");
+    worker.port.onmessage = t.step_func(e => {
+        // Step 3
+        assert_equals(e.data, "DidStart", "Worker should have started");
+        t.done();
+    });
+}, "Check SharedWorker sameSiteCookies option default for first-party");
diff --git a/tests/wpt/tests/workers/same-site-cookies/first-party.none.tentative.https.window.js b/tests/wpt/tests/workers/same-site-cookies/first-party.none.tentative.https.window.js
new file mode 100644
index 00000000000..762d924eb92
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/first-party.none.tentative.https.window.js
@@ -0,0 +1,19 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (window) Set up listener for "DidStart" message and start worker.
+// Step 2 (worker) Send "DidStart" message to window.
+// Step 3 (window) Receive "DidStart" message and cleanup.
+
+async_test(t => {
+    // Step 1
+    const worker = new SharedWorker("/workers/same-site-cookies/resources/worker.js", {sameSiteCookies: "none"});
+    worker.port.onmessage = t.step_func(e => {
+        // Step 3
+        assert_equals(e.data, "DidStart", "Worker should have started");
+        t.done();
+    });
+}, "Check SharedWorker sameSiteCookies option none for first-party");
diff --git a/tests/wpt/tests/workers/same-site-cookies/resources/iframe-iframe.html b/tests/wpt/tests/workers/same-site-cookies/resources/iframe-iframe.html
new file mode 100644
index 00000000000..0c5582176d4
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/resources/iframe-iframe.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<body>
+<script>
+// Step 3 (workers/same-site-cookies/third-party.{})
+test_driver.set_test_context(window.top);
+const type = (new URLSearchParams(window.location.search)).get("type");
+let options = {};
+switch (type) {
+    case "default":
+        break;
+    case "all":
+        options.sameSiteCookies = "all";
+        break;
+    case "none":
+        options.sameSiteCookies = "none";
+        break;
+}
+// Step 5 (workers/same-site-cookies/third-party.{})
+try {
+    const worker = new SharedWorker("/workers/same-site-cookies/resources/worker.js", options);
+    worker.port.onmessage = (e) => {
+        window.top.postMessage(e.data, "*");
+    };
+} catch (_) {
+    window.top.postMessage("DidNotStart", "*");
+}
+</script>
+</body>
diff --git a/tests/wpt/tests/workers/same-site-cookies/resources/iframe.sub.html b/tests/wpt/tests/workers/same-site-cookies/resources/iframe.sub.html
new file mode 100644
index 00000000000..2531f3d6203
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/resources/iframe.sub.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<body>
+<script>
+// Step 2 (workers/same-site-cookies/third-party.{})
+test_driver.set_test_context(window.top);
+const type = (new URLSearchParams(window.location.search)).get("type");
+let iframe = document.createElement("iframe");
+iframe.src = "https://{{hosts[][]}}:{{ports[https][0]}}/workers/same-site-cookies/resources/iframe-iframe.html?type=" + type;
+document.body.appendChild(iframe);
+</script>
+</body>
diff --git a/tests/wpt/tests/workers/same-site-cookies/resources/worker.js b/tests/wpt/tests/workers/same-site-cookies/resources/worker.js
new file mode 100644
index 00000000000..658f499e92a
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/resources/worker.js
@@ -0,0 +1,5 @@
+// Step 2/4 (workers/same-site-cookies/{})
+self.onconnect = (e) => {
+    e.ports[0].postMessage("DidStart");
+    self.close();
+}
diff --git a/tests/wpt/tests/workers/same-site-cookies/third-party.all.tentative.sub.https.window.js b/tests/wpt/tests/workers/same-site-cookies/third-party.all.tentative.sub.https.window.js
new file mode 100644
index 00000000000..51ad1d3b025
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/third-party.all.tentative.sub.https.window.js
@@ -0,0 +1,24 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (top-frame) Set up listener for "DidNotStart" message and open cross-site iframe.
+// Step 2 (sub-frame) Open iframe same-site to top-frame.
+// Step 3 (sub-sub-frame) Set up listener for message and start worker.
+// Step 4 (worker) Skipped.
+// Step 5 (sub-sub-frame) Worker failed to start and window messages "DidNotStart".
+// Step 6 (top-frame) Receive "DidNotStart" message and cleanup.
+
+async_test(t => {
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+    // Step 6
+    assert_equals(e.data, "DidNotStart", "Worker should not have started");
+    t.done();
+  }));
+  let iframe = document.createElement("iframe");
+  iframe.src = "https://{{hosts[alt][]}}:{{ports[https][0]}}/workers/same-site-cookies/resources/iframe.sub.html?type=all";
+  document.body.appendChild(iframe);
+}, "Check SharedWorker sameSiteCookies option all for third-party");
diff --git a/tests/wpt/tests/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js b/tests/wpt/tests/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js
new file mode 100644
index 00000000000..194df38390e
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/third-party.default.tentative.sub.https.window.js
@@ -0,0 +1,24 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (top-frame) Set up listener for "DidStart" message and open cross-site iframe.
+// Step 2 (sub-frame) Open iframe same-site to top-frame.
+// Step 3 (sub-sub-frame) Set up listener for message and start worker.
+// Step 4 (worker) Send "DidStart" message to iframe.
+// Step 5 (sub-sub-frame) Receive message and pass on to window.
+// Step 6 (top-frame) Receive "DidStart" message and cleanup.
+
+async_test(t => {
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+    // Step 6
+    assert_equals(e.data, "DidStart", "Worker should have started");
+    t.done();
+  }));
+  let iframe = document.createElement("iframe");
+  iframe.src = "https://{{hosts[alt][]}}:{{ports[https][0]}}/workers/same-site-cookies/resources/iframe.sub.html?type=default";
+  document.body.appendChild(iframe);
+}, "Check SharedWorker sameSiteCookies option default for third-party");
diff --git a/tests/wpt/tests/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js b/tests/wpt/tests/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js
new file mode 100644
index 00000000000..b91b9d7ab27
--- /dev/null
+++ b/tests/wpt/tests/workers/same-site-cookies/third-party.none.tentative.sub.https.window.js
@@ -0,0 +1,24 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+
+'use strict';
+
+// Here's the set-up for this test:
+// Step 1 (top-frame) Set up listener for "DidStart" message and open cross-site iframe.
+// Step 2 (sub-frame) Open iframe same-site to top-frame.
+// Step 3 (sub-sub-frame) Set up listener for message and start worker.
+// Step 4 (worker) Send "DidStart" message to iframe.
+// Step 5 (sub-sub-frame) Receive message and pass on to window.
+// Step 6 (top-frame) Receive "DidStart" message and cleanup.
+
+async_test(t => {
+  // Step 1
+  window.addEventListener("message", t.step_func(e => {
+    // Step 6
+    assert_equals(e.data, "DidStart", "Worker should have started");
+    t.done();
+  }));
+  let iframe = document.createElement("iframe");
+  iframe.src = "https://{{hosts[alt][]}}:{{ports[https][0]}}/workers/same-site-cookies/resources/iframe.sub.html?type=none";
+  document.body.appendChild(iframe);
+}, "Check SharedWorker sameSiteCookies option none for third-party");