From 03ac032798731b0c149b1a497a390b252bb01658 Mon Sep 17 00:00:00 2001
From: Servo WPT Sync <32481905+servo-wpt-sync@users.noreply.github.com>
Date: Sun, 11 Feb 2024 03:01:56 -0500
Subject: [PATCH] Sync WPT with upstream (11-02-2024) (#31309)

* Update web-platform-tests to revision b'33d11f1db34802fda00e64ddeb0b7ef040cf65be'

* Update expectations

---------

Co-authored-by: sagudev <16504129+sagudev@users.noreply.github.com>
---
 .../abspos/position-absolute-013.html.ini     |    1 +
 .../overlay-transition-property.html.ini      |    3 +
 .../white-space/eol-spaces-bidi-001.html.ini  |    2 -
 .../white-space/eol-spaces-bidi-004.html.ini  |    2 +
 .../parsing/transition-valid.html.ini         |   24 +
 ...ize-width-interpolation.tentative.html.ini |  168 +
 .../calc-size-parsing.tentative.html.ini      |   42 +
 .../calc-size-width.tentative.html.ini        |    2 +
 ...ryList-addListener-removeListener.html.ini |    3 +
 .../offsetTopLeft-table-caption.html.ini      |    3 +
 .../css/cssom-view/scroll-zoom.html.ini       |    3 +
 .../webkit-transition-end-event.html.ini      |   14 +-
 .../tentative/observable-forEach.any.js.ini   |   38 +
 .../observable-forEach.window.js.ini          |    6 +
 .../traversal/NodeIterator-removal.html.ini   |    2 +
 ...-constructor-init-body-override.any.js.ini |    8 +
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 .../gzip}/gzip-body.any.js.ini                |    8 +-
 .../zstd/bad-zstd-body.https.any.js.ini       |   33 +
 ...indow-zstd-body.tentative.https.any.js.ini |   14 +
 .../zstd/big-zstd-body.https.any.js.ini       |   21 +
 .../zstd/zstd-body.https.any.js.ini           |   20 +
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 ...ut-srcdoc-navigation-blocked.window.js.ini |    1 +
 .../empty-iframe-load-event.html.ini          |    6 +
 ...eshow-events-iframe-contentWindow.html.ini |    3 +
 .../navigate-to-unparseable-url.html.ini      |    3 -
 ...avigation-unload-same-origin.window.js.ini |    3 -
 ...ml.ini => traverse_the_history_5.html.ini} |    2 +-
 ...creating_browsing_context_test_01.html.ini |    3 +
 ...as.2d.disconnected-font-size-math.html.ini |    2 +
 .../dom/reflection-forms-weekmonth.html.ini   |    6 +
 .../html/dom/reflection-forms.html.ini        |  249 ++
 .../html/dom/reflection-grouping.html.ini     |  132 +
 .../html/dom/reflection-metadata.html.ini     |   36 +
 .../html/dom/reflection-misc.html.ini         |   72 +
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 .../html/dom/reflection-text.html.ini         |  174 +
 .../autofocus-area.html.ini                   |    3 +
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 .../widgets/field-sizing-textarea.html.ini}   |    2 +-
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 .../widgets/textarea-cols-rows.html.ini       |    6 +
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 .../text-plain.window.js.ini                  |    9 -
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 .../dialog-focus-previous-outside.html.ini    |   15 +-
 .../popover-shadowhost-focus.html.ini         |   12 +-
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 .../test_resource_timing.https.html.ini       |    3 +
 ...nge-into-different-root.tentative.html.ini |   48 +
 .../xhr/xhr-timeout-longtask.any.js.ini       |    6 +
 tests/wpt/meta/MANIFEST.json                  | 3778 +++++++++--------
 .../at-font-face-font-matching.html.ini       |   51 +-
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 .../calc-size-width.tentative.html.ini        |    2 +
 ...QueryList-addListener-handleEvent.html.ini |    3 -
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 .../meta/css/cssom-view/scroll-zoom.html.ini  |    3 +
 .../tentative/observable-forEach.any.js.ini   |   38 +
 .../observable-forEach.window.js.ini          |    6 +
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 ...-constructor-init-body-override.any.js.ini |    8 +
 .../gzip}/bad-gzip-body.any.js.ini            |    4 +-
 .../gzip}/big-gzip-body.https.any.js.ini      |   13 +-
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 ...indow-zstd-body.tentative.https.any.js.ini |   15 +
 .../zstd/big-zstd-body.https.any.js.ini       |   21 +
 .../zstd/zstd-body.https.any.js.ini           |   20 +
 ...lement-img-environment-change.sub.html.ini |    6 +-
 ...eshow-events-iframe-contentWindow.html.ini |    3 +
 .../load-pageshow-events-window-open.html.ini |    3 -
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 .../replace-before-load/a-click.html.ini      |    3 +
 .../traverse_the_history_5.html.ini           |    3 +
 ...creating_browsing_context_test_01.html.ini |    3 +
 .../dom/reflection-forms-weekmonth.html.ini   |    6 +
 .../meta/html/dom/reflection-forms.html.ini   |  249 ++
 .../html/dom/reflection-grouping.html.ini     |  132 +
 .../html/dom/reflection-metadata.html.ini     |   36 +
 .../meta/html/dom/reflection-misc.html.ini    |   72 +
 .../html/dom/reflection-obsolete.html.ini     |  126 +
 .../html/dom/reflection-sections.html.ini     |   90 +
 .../meta/html/dom/reflection-tabular.html.ini |  108 +
 .../meta/html/dom/reflection-text.html.ini    |  174 +
 ...nitiator-is-not-opener.https.window.js.ini |    1 -
 .../autofocus-area.html.ini                   |    3 +
 .../supported-elements.html.ini               |    7 +-
 ...n-links-wrapped-in-svg.historical.html.ini |    6 +
 ...ini => field-sizing-input-number.html.ini} |    2 +-
 ...l.ini => field-sizing-input-text.html.ini} |    2 +-
 ....html.ini => field-sizing-select.html.ini} |    2 +-
 .../widgets/field-sizing-textarea.html.ini}   |    2 +-
 .../widgets/input-text-size.html.ini          |    3 +
 .../widgets/textarea-cols-rows.html.ini       |    6 +
 .../iframe_sandbox_popups_escaping-1.html.ini |    4 +-
 .../iframe_sandbox_popups_escaping-2.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-1.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-2.html.ini |    3 +-
 ...rame_sandbox_popups_nonescaping-3.html.ini |    3 +-
 .../non-active-document.html.ini              |    9 -
 ...rm-during-planned-navigation-task.html.ini |    4 +
 .../html/semantics/forms/historical.html.ini  |    3 -
 ...ild-button-and-datalist.tentative.html.ini |    2 +
 .../dialog-focus-previous-outside.html.ini    |   15 +-
 .../popover-shadowhost-focus.html.ini         |   12 +-
 ...move-initial-about-blankness.window.js.ini |    3 +-
 ...le-event-handler-settings-objects.html.ini |    3 +
 .../test_resource_timing.html.ini             |    3 +
 ...nge-into-different-root.tentative.html.ini |   48 +
 .../webmessaging/with-ports}/018.html.ini     |    0
 .../alpha/import-in-moduleworker.html.ini     |    1 -
 .../Worker/Worker-constructor.html.ini        |    0
 ...service-worker-registration.https.html.ini |    1 +
 .../crashtests/remaining-invalid-objects.html |    7 +
 .../resources/helpers.js                      |    5 -
 ...tion-fallback-invalidation-shadow-dom.html |    5 -
 .../position-try-options-computed.html        |   22 +
 .../parsing/position-try-options-parsing.html |   29 +
 .../parsing/position-try-order-computed.html  |   20 +
 .../parsing/position-try-order-parsing.html   |   23 +
 .../position-fallback-tree-scoped.html        |    6 -
 .../property-interpolations.html              |   90 +
 .../add-pseudo-while-animating-001.html       |   43 +
 ...on-negative-percentage-comparison-002.html |   22 +
 .../css-cascade/scope-shadow.tentative.html   |    7 -
 .../tests/css/css-cascade/scope-visited.html  |    5 +-
 .../container-for-shadow-dom.html             |    2 -
 .../container-name-tree-scoped.html           |   24 +-
 .../container-size-shadow-invalidation.html   |    2 -
 .../container-units-shadow.html               |    2 -
 .../mathml-container-type-crash.html          |    9 +
 .../style-container-for-shadow-dom.html       |    2 -
 .../css-grid/grid-table-cell-001-crash.html   |   30 +
 .../alignment-in-subgridded-axes-002-ref.html |   67 +
 .../alignment-in-subgridded-axes-002.html     |   72 +
 .../subgrid/subgrid-baseline-012.html         |   29 +
 .../ellipsis-with-image-crash.html            |   25 +
 .../monolithic-overflow-001-print-ref.html    |    0
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 .../monolithic-overflow-027-print-ref.html    |   11 +
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 .../monolithic-overflow-030-print-ref.html    |   28 +
 .../monolithic-overflow-030-print.html        |   15 +
 ...monolithic-overflow-4-pages-print-ref.html |    0
 .../css-page/trailing-declaration-crash.html  |    8 +
 .../backdrop-tree-abiding-slotted.html        |    1 -
 .../overlay/overlay-transition-property.html  |    4 +-
 .../prefer-focused-element.html               |  128 +
 .../prefer-focused-nested-containers.html     |  109 +
 .../resources/common.js                       |  148 +
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 .../white-space/eol-spaces-bidi-004.html      |   41 +
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 .../text-wrap-balance-overflow-002-ref.html   |   13 +
 .../text-wrap-balance-overflow-002.html       |   18 +
 .../parsing/transition-computed.html          |   12 +-
 .../parsing/transition-valid.html             |   16 +-
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 ...e-transition-destroyed-document-crash.html |   27 +
 .../pseudo-with-classes-entry.html            |   54 +
 .../pseudo-with-classes-exit.html             |   54 +
 .../pseudo-with-classes-match-ident.html      |   41 +
 ...-with-classes-match-multiple-wildcard.html |   41 +
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 .../pseudo-with-classes-mismatch-partial.html |   45 +
 ...pseudo-with-classes-mismatch-wildcard.html |   46 +
 ...eudo-with-classes-multiple-vt-classes.html |   41 +
 ...th-classes-new-with-class-old-without.html |   46 +
 ...th-classes-old-with-class-new-without.html |   51 +
 .../pseudo-with-classes-ref.html              |   15 +
 ...do-with-classes-view-transition-group.html |   37 +
 ...th-classes-view-transition-image-pair.html |   37 +
 .../offsetTopLeft-table-caption.html          |   23 +
 .../wpt/tests/css/cssom-view/scroll-zoom.html |   27 +-
 .../nth-child-in-shadow-root.html             |    2 -
 .../nth-child-of-in-shadow-root.html          |    2 -
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 .../selectors/invalidation/part-pseudo.html   |    3 +-
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 .../zoom/tentative/image-intrinsic-size.html  |   14 +
 tests/wpt/tests/dom/common.js                 |   52 +-
 .../wpt/tests/dom/nodes/Node-properties.html  |   36 +-
 .../tentative/observable-forEach.any.js       |  184 +
 .../tentative/observable-forEach.window.js    |   59 +
 .../tests/dom/ranges/Range-cloneContents.html |    6 +-
 .../dom/ranges/Range-deleteContents.html      |    6 +-
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 .../edit-context-input.tentative.html         |  133 +-
 .../get-nested-configs.https.html             |    4 +-
 ...uest-constructor-init-body-override.any.js |   21 +
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 .../{ => gzip}/gzip-body.any.js               |    0
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 .../resources/foo.octetstream.gz.headers      |    0
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 .../zstd/bad-zstd-body.https.any.js           |   22 +
 ...ig-window-zstd-body.tentative.https.any.js |    9 +
 .../zstd/big-zstd-body.https.any.js           |   55 +
 .../zstd/resources/bad-zstd-body.py           |    3 +
 .../zstd/resources/big.text.zst               |  Bin 0 -> 2509 bytes
 .../zstd/resources/big.text.zst.headers       |    3 +
 .../zstd/resources/big.window.zst             |  Bin 0 -> 599 bytes
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 .../zstd/resources/foo.text.zst               |  Bin 0 -> 25 bytes
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 .../zstd/zstd-body.https.any.js               |   15 +
 .../tentative/component-ads.https.window.js   |   33 +-
 .../resources/direct-from-seller-signals.py   |  269 +-
 .../resources/fledge_http_server_util.py      |   64 +-
 .../tentative/resources/request-tracker.py    |    9 +-
 .../resources/trusted-bidding-signals.py      |    6 +-
 .../resources/trusted-scoring-signals.py      |    6 +-
 .../hasubi-mono/HasubiMono-Regular.woff2      |  Bin 0 -> 26432 bytes
 tests/wpt/tests/fonts/hasubi-mono/LICENSE.txt |   92 +
 tests/wpt/tests/fonts/hasubi-mono/README.md   |    7 +
 .../generic-sensor-iframe-tests.sub.js        |   37 +-
 .../generic-sensor/generic-sensor-tests.js    |   17 +-
 tests/wpt/tests/html/dom/reflection.js        |  234 +-
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 .../resources/stylable-select-styles.css      |   18 +
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 ...t-child-button-and-datalist.tentative.html |   18 +
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 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-partial.html
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 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-multiple-vt-classes.html
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 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-old-with-class-new-without.html
 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-ref.html
 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-group.html
 create mode 100644 tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-image-pair.html
 create mode 100644 tests/wpt/tests/css/cssom-view/offsetTopLeft-table-caption.html
 create mode 100644 tests/wpt/tests/css/selectors/open-closed-pseudo.html
 create mode 100644 tests/wpt/tests/css/zoom/tentative/image-intrinsic-size.html
 create mode 100644 tests/wpt/tests/dom/observable/tentative/observable-forEach.any.js
 create mode 100644 tests/wpt/tests/dom/observable/tentative/observable-forEach.window.js
 create mode 100644 tests/wpt/tests/fetch/api/request/request-constructor-init-body-override.any.js
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/bad-gzip-body.any.js (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/big-gzip-body.https.any.js (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/gzip-body.any.js (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/bad-gzip-body.py (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/big.text.gz (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/big.text.gz.headers (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/foo.octetstream.gz (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/foo.octetstream.gz.headers (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/foo.text.gz (100%)
 rename tests/wpt/tests/fetch/content-encoding/{ => gzip}/resources/foo.text.gz.headers (100%)
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/bad-zstd-body.https.any.js
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/big-zstd-body.https.any.js
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/bad-zstd-body.py
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst.headers
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst.headers
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst.headers
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst.headers
 create mode 100644 tests/wpt/tests/fetch/content-encoding/zstd/zstd-body.https.any.js
 create mode 100644 tests/wpt/tests/fonts/hasubi-mono/HasubiMono-Regular.woff2
 create mode 100644 tests/wpt/tests/fonts/hasubi-mono/LICENSE.txt
 create mode 100644 tests/wpt/tests/fonts/hasubi-mono/README.md
 create mode 100644 tests/wpt/tests/html/interaction/focus/the-autofocus-attribute/autofocus-area.html
 create mode 100644 tests/wpt/tests/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html
 rename tests/wpt/tests/html/rendering/widgets/{field-sizing-input-number.tentative.html => field-sizing-input-number.html} (100%)
 rename tests/wpt/tests/html/rendering/widgets/{field-sizing-input-text.tentative.html => field-sizing-input-text.html} (100%)
 rename tests/wpt/tests/html/rendering/widgets/{field-sizing-select.tentative.html => field-sizing-select.html} (100%)
 rename tests/wpt/tests/html/rendering/widgets/{field-sizing-textarea.tentative.html => field-sizing-textarea.html} (100%)
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-select-element/resources/stylable-select-styles.css
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-ref.html
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.html
 create mode 100644 tests/wpt/tests/html/semantics/popovers/label-in-invoker.html
 create mode 100644 tests/wpt/tests/intersection-observer/scroll-margin-iframe.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013-ref.html
 create mode 100644 tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013.html
 rename tests/wpt/tests/mathml/relations/html5-tree/{href-click-1-ref.html => href-click-001.tentative-ref.html} (100%)
 rename tests/wpt/tests/mathml/relations/html5-tree/{href-click-1.html => href-click-001.tentative.html} (94%)
 rename tests/wpt/tests/mathml/relations/html5-tree/{href-click-2-ref.html => href-click-002.tentative-ref.html} (100%)
 rename tests/wpt/tests/mathml/relations/html5-tree/{href-click-2.html => href-click-002.tentative.html} (95%)
 rename tests/wpt/tests/mathml/relations/html5-tree/{href-click-3.html => href-click-003.tentative.html} (100%)
 create mode 100644 tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative-ref.html
 create mode 100644 tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative.html
 rename tests/wpt/tests/mathml/relations/html5-tree/{tabindex-001.html => tabindex-001.tentative.html} (100%)
 rename tests/wpt/tests/mathml/relations/html5-tree/{tabindex-002.html => tabindex-002.tentative.html} (100%)
 create mode 100644 tests/wpt/tests/notifications/resources/helpers.js
 create mode 100644 tests/wpt/tests/notifications/shownotification-without-permission.https.window.js
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-in-iframe.html
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-scrollbar.html
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-in-iframe.html
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-scrollbar.html
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change.html
 create mode 100644 tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll.html
 create mode 100644 tests/wpt/tests/pointerevents/pointerevent_pointermove_after_pointerup_target_removed.html
 delete mode 100644 tests/wpt/tests/resources/declarative-shadow-dom-polyfill.js
 create mode 100644 tests/wpt/tests/selection/move-selection-range-into-different-root.tentative.html
 delete mode 100644 tests/wpt/tests/serial/resources/automation.js
 delete mode 100644 tests/wpt/tests/serial/serialPort-disconnect-during-abort.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_close.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_events.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_forget.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_getInfo.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_getSignals.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_ondisconnect.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_open.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_byob.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_cancel.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_chain.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_closeLocked.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_disconnect.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_largeRead.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_open.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_parityError.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_pipeThrough.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_readable_smallRead.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_setSignals.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_writable.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serialPort_writable_detachBuffer.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serial_getPorts.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serial_onconnect.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serial_ondisconnect.https.any.js
 delete mode 100644 tests/wpt/tests/serial/serial_requestPort.https.window.js
 create mode 100644 tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-available-to-element-internals.html
 create mode 100644 tests/wpt/tests/shared-storage-selecturl-limit/select-url-limit-multiple-worklets.tentative.https.sub.html
 create mode 100644 tests/wpt/tests/shared-storage/select-url-on-shared-storage-and-worklet-object-successively.tentative.https.sub.html
 create mode 100644 tests/wpt/tests/shared-storage/select-url-on-two-worklets.tentative.https.sub.html
 create mode 100644 tests/wpt/tests/svg/painting/reftests/marker-implicit-subpaths.html
 create mode 100644 tests/wpt/tests/svg/pservers/reftests/gradient-transform-01.svg
 create mode 100644 tests/wpt/tests/svg/pservers/reftests/gradient-transform-02.svg
 create mode 100644 tests/wpt/tests/svg/pservers/reftests/pattern-transform-02.svg
 create mode 100644 tests/wpt/tests/svg/text/crashtests/textlength-zwj-crash.svg
 create mode 100644 tests/wpt/tests/svg/text/reftests/first-letter-ref.svg
 create mode 100644 tests/wpt/tests/svg/text/reftests/first-letter.svg
 create mode 100644 tests/wpt/tests/wai-aria/role/generic-roles.html
 rename tests/wpt/tests/web-locks/{acquire.tentative.https.any.js => acquire.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{clientids.tentative.https.html => clientids.https.html} (100%)
 rename tests/wpt/tests/web-locks/{frames.tentative.https.html => frames.https.html} (100%)
 rename tests/wpt/tests/web-locks/{held.tentative.https.any.js => held.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{idlharness.tentative.https.any.js => idlharness.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{ifAvailable.tentative.https.any.js => ifAvailable.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{lock-attributes.tentative.https.any.js => lock-attributes.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{mode-exclusive.tentative.https.any.js => mode-exclusive.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{mode-mixed.tentative.https.any.js => mode-mixed.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{mode-shared.tentative.https.any.js => mode-shared.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{non-fully-active.tentative.https.html => non-fully-active.https.html} (100%)
 rename tests/wpt/tests/web-locks/{non-secure-context.tentative.any.js => non-secure-context.any.js} (100%)
 rename tests/wpt/tests/web-locks/{opaque-origin.tentative.https.html => opaque-origin.https.html} (100%)
 rename tests/wpt/tests/web-locks/{query-empty.tentative.https.any.js => query-empty.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{query-ordering.tentative.https.html => query-ordering.https.html} (100%)
 rename tests/wpt/tests/web-locks/{query.tentative.https.any.js => query.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{resource-names.tentative.https.any.js => resource-names.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{secure-context.tentative.https.any.js => secure-context.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{signal.tentative.https.any.js => signal.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{steal.tentative.https.any.js => steal.https.any.js} (100%)
 rename tests/wpt/tests/web-locks/{workers.tentative.https.html => workers.https.html} (100%)
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/continue_request/request.py
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/continue_response/credentials.py
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/continue_response/request.py

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 80111fb0236..2b2e0fce8eb 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
@@ -1,4 +1,5 @@
 [position-absolute-013.html]
+  expected: TIMEOUT
   [.flexbox 309]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/css/css-position/overlay/overlay-transition-property.html.ini b/tests/wpt/meta-legacy-layout/css/css-position/overlay/overlay-transition-property.html.ini
index aacfbd3b035..7645c8bf8c7 100644
--- a/tests/wpt/meta-legacy-layout/css/css-position/overlay/overlay-transition-property.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-position/overlay/overlay-transition-property.html.ini
@@ -1,3 +1,6 @@
 [overlay-transition-property.html]
   [Property transition value 'overlay 1s']
     expected: FAIL
+
+  [e.style['transition'\] = "overlay 2s" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-001.html.ini
deleted file mode 100644
index eafc8f6012c..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-001.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[eol-spaces-bidi-001.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-004.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-004.html.ini
new file mode 100644
index 00000000000..82d8fad549e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/white-space/eol-spaces-bidi-004.html.ini
@@ -0,0 +1,2 @@
+[eol-spaces-bidi-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-transitions/parsing/transition-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-transitions/parsing/transition-valid.html.ini
new file mode 100644
index 00000000000..556b9947f92
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-transitions/parsing/transition-valid.html.ini
@@ -0,0 +1,24 @@
+[transition-valid.html]
+  [e.style['transition'\] = "1s" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "cubic-bezier(0, -2, 1, 3)" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "1s -3s" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "none" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "top" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "1s -3s, cubic-bezier(0, -2, 1, 3) top" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "all" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "all 1s" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini
new file mode 100644
index 00000000000..0a3d25827ee
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini
@@ -0,0 +1,168 @@
+[calc-size-width-interpolation.tentative.html]
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-parsing.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-parsing.tentative.html.ini
new file mode 100644
index 00000000000..24d7ae6ee1d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-parsing.tentative.html.ini
@@ -0,0 +1,42 @@
+[calc-size-parsing.tentative.html]
+  [e.style['width'\] = "calc-size(fit-content, size)" should set the property value]
+    expected: FAIL
+
+  [e.style['height'\] = "calc-size(min-content, size * 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['max-width'\] = "calc-size(max-content, size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['max-height'\] = "calc-size(fit-content, 30px + size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(fit-content, 50% + size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 40%)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 50px + 30%)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, calc-size(10px, sign(size) * size))" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(30px, 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(any, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(2in, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(min-content, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(min-content, size), size)" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-width.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-width.tentative.html.ini
new file mode 100644
index 00000000000..6564bc8fa9d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-values/calc-size/calc-size-width.tentative.html.ini
@@ -0,0 +1,2 @@
+[calc-size-width.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
index 314dca9c1f5..d52a3e77a70 100644
--- a/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-addListener-removeListener.html.ini
+++ b/tests/wpt/meta-legacy-layout/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-legacy-layout/css/cssom-view/offsetTopLeft-table-caption.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-table-caption.html.ini
new file mode 100644
index 00000000000..131155bb1ab
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-table-caption.html.ini
@@ -0,0 +1,3 @@
+[offsetTopLeft-table-caption.html]
+  [offset* APIs on tables with captions.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/scroll-zoom.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/scroll-zoom.html.ini
index db32ece8e06..c281ce87f70 100644
--- a/tests/wpt/meta-legacy-layout/css/cssom-view/scroll-zoom.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/cssom-view/scroll-zoom.html.ini
@@ -1,3 +1,6 @@
 [scroll-zoom.html]
   [scroll properties for elements with css zoom 1]
     expected: FAIL
+
+  [scroll{Width, Height}]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/events/webkit-transition-end-event.html.ini b/tests/wpt/meta-legacy-layout/dom/events/webkit-transition-end-event.html.ini
index b7fe8688a23..eb8b8d11dff 100644
--- a/tests/wpt/meta-legacy-layout/dom/events/webkit-transition-end-event.html.ini
+++ b/tests/wpt/meta-legacy-layout/dom/events/webkit-transition-end-event.html.ini
@@ -1,4 +1,5 @@
 [webkit-transition-end-event.html]
+  expected: TIMEOUT
   [dispatchEvent of an transitionend event does not trigger a prefixed event handler or listener]
     expected: FAIL
 
@@ -12,16 +13,25 @@
     expected: FAIL
 
   [event types for prefixed and unprefixed transitionend event listeners should be named appropriately]
-    expected: FAIL
+    expected: NOTRUN
 
   [ontransitionend and onwebkittransitionend are not aliases]
     expected: FAIL
 
   [webkitTransitionEnd event listener should trigger for an animation]
-    expected: FAIL
+    expected: TIMEOUT
 
   [dispatchEvent of a webkitTransitionEnd event does trigger a prefixed event handler or listener]
     expected: FAIL
 
   [onwebkittransitionend event handler should not trigger if an unprefixed event handler also exists]
     expected: FAIL
+
+  [webkitTransitionEnd event listener should not trigger if an unprefixed listener also exists]
+    expected: NOTRUN
+
+  [webkitTransitionEnd event listener should not trigger if an unprefixed event handler also exists]
+    expected: NOTRUN
+
+  [webkitTransitionEnd event listener is case sensitive]
+    expected: NOTRUN
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.any.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.any.js.ini
new file mode 100644
index 00000000000..32fa7d11a89
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.any.js.ini
@@ -0,0 +1,38 @@
+[observable-forEach.any.worker.html]
+  [forEach(): Visitor callback called synchronously for each value]
+    expected: FAIL
+
+  [Errors thrown by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors pushed by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors thrown in the visitor callback reject the promise and unsubscribe from the source]
+    expected: FAIL
+
+  [forEach visitor callback rejection microtask ordering]
+    expected: FAIL
+
+  [forEach() promise resolves with undefined]
+    expected: FAIL
+
+
+[observable-forEach.any.html]
+  [forEach(): Visitor callback called synchronously for each value]
+    expected: FAIL
+
+  [Errors thrown by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors pushed by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors thrown in the visitor callback reject the promise and unsubscribe from the source]
+    expected: FAIL
+
+  [forEach visitor callback rejection microtask ordering]
+    expected: FAIL
+
+  [forEach() promise resolves with undefined]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.window.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.window.js.ini
new file mode 100644
index 00000000000..7c894bf3997
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-forEach.window.js.ini
@@ -0,0 +1,6 @@
+[observable-forEach.window.html]
+  [forEach()'s internal observer's next steps do not crash in a detached document]
+    expected: FAIL
+
+  [forEach()'s internal observer's next steps do not crash when visitor callback detaches the document]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/traversal/NodeIterator-removal.html.ini b/tests/wpt/meta-legacy-layout/dom/traversal/NodeIterator-removal.html.ini
index 342f27a8019..036c962f873 100644
--- a/tests/wpt/meta-legacy-layout/dom/traversal/NodeIterator-removal.html.ini
+++ b/tests/wpt/meta-legacy-layout/dom/traversal/NodeIterator-removal.html.ini
@@ -66,3 +66,5 @@
   [Test removing node xmlDoctype]
     expected: FAIL
 
+  [Test removing node paras[5\].firstChild]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/api/request/request-constructor-init-body-override.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/api/request/request-constructor-init-body-override.any.js.ini
new file mode 100644
index 00000000000..21c53bf3ce0
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/api/request/request-constructor-init-body-override.any.js.ini
@@ -0,0 +1,8 @@
+[request-constructor-init-body-override.any.html]
+  [Check that the body of a new request can be overridden when created from an existing Request object]
+    expected: FAIL
+
+
+[request-constructor-init-body-override.any.worker.html]
+  [Check that the body of a new request can be overridden when created from an existing Request object]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/content-encoding/bad-gzip-body.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
similarity index 100%
rename from tests/wpt/meta/fetch/content-encoding/bad-gzip-body.any.js.ini
rename to tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
index 6c867e1d349..b381fb6e135 100644
--- a/tests/wpt/meta/fetch/content-encoding/bad-gzip-body.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
@@ -1,33 +1,33 @@
+[bad-gzip-body.any.html]
+  [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with text() should reject]
+    expected: FAIL
+
+
 [bad-gzip-body.any.serviceworker.html]
   expected: ERROR
 
+[bad-gzip-body.any.worker.html]
+  [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad gzip content with text() should reject]
+    expected: FAIL
+
+
 [bad-gzip-body.any.sharedworker.html]
   expected: ERROR
-
-[bad-gzip-body.any.html]
-  [Consuming the body of a resource with bad gzip content with json() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with blob() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with text() should reject]
-    expected: FAIL
-
-
-[bad-gzip-body.any.worker.html]
-  [Consuming the body of a resource with bad gzip content with json() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with blob() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
-    expected: FAIL
-
-  [Consuming the body of a resource with bad gzip content with text() should reject]
-    expected: FAIL
-
diff --git a/tests/wpt/meta/fetch/content-encoding/big-gzip-body.https.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
similarity index 100%
rename from tests/wpt/meta/fetch/content-encoding/big-gzip-body.https.any.js.ini
rename to tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
index 26c05201f20..bc6e10b20c3 100644
--- a/tests/wpt/meta/fetch/content-encoding/big-gzip-body.https.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
@@ -1,6 +1,3 @@
-[big-gzip-body.https.any.sharedworker.html]
-  expected: ERROR
-
 [big-gzip-body.https.any.worker.html]
   [large gzip data should be decompressed successfully]
     expected: FAIL
@@ -17,5 +14,8 @@
     expected: FAIL
 
 
+[big-gzip-body.https.any.sharedworker.html]
+  expected: ERROR
+
 [big-gzip-body.https.any.serviceworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/fetch/content-encoding/gzip-body.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/gzip-body.any.js.ini
similarity index 100%
rename from tests/wpt/meta/fetch/content-encoding/gzip-body.any.js.ini
rename to tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/gzip-body.any.js.ini
index 92032d3420c..70349a365e2 100644
--- a/tests/wpt/meta/fetch/content-encoding/gzip-body.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip/gzip-body.any.js.ini
@@ -1,9 +1,9 @@
-[gzip-body.any.serviceworker.html]
-  expected: ERROR
-
 [gzip-body.any.sharedworker.html]
   expected: ERROR
 
+[gzip-body.any.html]
+
 [gzip-body.any.worker.html]
 
-[gzip-body.any.html]
+[gzip-body.any.serviceworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..2bdd6173213
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini
@@ -0,0 +1,33 @@
+[bad-zstd-body.https.any.worker.html]
+  [Consuming the body of a resource with bad zstd content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with text() should reject]
+    expected: FAIL
+
+
+[bad-zstd-body.https.any.sharedworker.html]
+  expected: ERROR
+
+[bad-zstd-body.https.any.html]
+  [Consuming the body of a resource with bad zstd content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with text() should reject]
+    expected: FAIL
+
+
+[bad-zstd-body.https.any.serviceworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini
new file mode 100644
index 00000000000..218d1fa025d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini
@@ -0,0 +1,14 @@
+[big-window-zstd-body.tentative.https.any.sharedworker.html]
+  expected: ERROR
+
+[big-window-zstd-body.tentative.https.any.worker.html]
+  [Consuming the body of a resource with too large of a zstd window size should reject]
+    expected: FAIL
+
+
+[big-window-zstd-body.tentative.https.any.serviceworker.html]
+  expected: ERROR
+
+[big-window-zstd-body.tentative.https.any.html]
+  [Consuming the body of a resource with too large of a zstd window size should reject]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..2f3d50faba2
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini
@@ -0,0 +1,21 @@
+[big-zstd-body.https.any.worker.html]
+  [large zstd data should be decompressed successfully]
+    expected: FAIL
+
+  [large zstd data should be decompressed successfully with byte stream]
+    expected: FAIL
+
+
+[big-zstd-body.https.any.html]
+  [large zstd data should be decompressed successfully]
+    expected: FAIL
+
+  [large zstd data should be decompressed successfully with byte stream]
+    expected: FAIL
+
+
+[big-zstd-body.https.any.sharedworker.html]
+  expected: ERROR
+
+[big-zstd-body.https.any.serviceworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/zstd-body.https.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..a4324048334
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/content-encoding/zstd/zstd-body.https.any.js.ini
@@ -0,0 +1,20 @@
+[zstd-body.https.any.serviceworker.html]
+  expected: ERROR
+
+[zstd-body.https.any.sharedworker.html]
+  expected: ERROR
+
+[zstd-body.https.any.html]
+  [fetched zstd data with content type text should be decompressed.]
+    expected: FAIL
+
+  [fetched zstd data with content type octetstream should be decompressed.]
+    expected: FAIL
+
+
+[zstd-body.https.any.worker.html]
+  [fetched zstd data with content type text should be decompressed.]
+    expected: FAIL
+
+  [fetched zstd data with content type octetstream should be decompressed.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini b/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
index f9de5391ad6..eccca660243 100644
--- a/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/metadata/generated/css-images.sub.tentative.html.ini
@@ -146,3 +146,6 @@
 
   [list-style-image sec-fetch-site - HTTPS downgrade-upgrade]
     expected: FAIL
+
+  [border-image sec-fetch-dest - Not sent to non-trustworthy same-origin destination]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/about-srcdoc-navigation-blocked.window.js.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/about-srcdoc-navigation-blocked.window.js.ini
index 4f8ca6048f2..ea9cbb0b4de 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/about-srcdoc-navigation-blocked.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/about-srcdoc-navigation-blocked.window.js.ini
@@ -1,4 +1,5 @@
 [about-srcdoc-navigation-blocked.window.html]
+  expected: TIMEOUT
   [Navigations to about:srcdoc via window.location must be blocked]
     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
new file mode 100644
index 00000000000..3e07e6b7d1f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
@@ -0,0 +1,6 @@
+[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/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
index 149bcb4ff8c..b8fd22e2b81 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html.ini
@@ -10,3 +10,6 @@
 
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
     expected: FAIL
+
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
index 27889a98fb5..24d2f8ac554 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
@@ -1,6 +1,3 @@
 [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-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
deleted file mode 100644
index 7dc346632a4..00000000000
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[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/history/the-history-interface/traverse_the_history_2.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
similarity index 71%
rename from tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
rename to tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
index 5d17a8e9419..7a5fcb79165 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_2.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -1,3 +1,3 @@
-[traverse_the_history_2.html]
+[traverse_the_history_5.html]
   [Multiple history traversals, last would be aborted]
     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
new file mode 100644
index 00000000000..4b4820d1729
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
@@ -0,0 +1,3 @@
+[creating_browsing_context_test_01.html]
+  [first argument: absolute url]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
new file mode 100644
index 00000000000..addd810a23d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/drawing-text-to-the-canvas/canvas.2d.disconnected-font-size-math.html.ini
@@ -0,0 +1,2 @@
+[canvas.2d.disconnected-font-size-math.html]
+  expected: CRASH
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-forms-weekmonth.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-forms-weekmonth.html.ini
index 2db2eec8f23..3e3cdd4956c 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-forms-weekmonth.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-forms-weekmonth.html.ini
@@ -643,3 +643,9 @@
 
   [input.useMap: IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [input.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-forms.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-forms.html.ini
index 111bce65996..5596325d7b3 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-forms.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-forms.html.ini
@@ -22352,3 +22352,252 @@
 
   [fieldset.autofocus: setAttribute() to true]
     expected: FAIL
+
+  [form.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [form.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [fieldset.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [fieldset.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [legend.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [legend.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [label.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [label.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [button.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [button.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [select.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [select.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [datalist.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [datalist.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [optgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [optgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [option.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [option.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [textarea.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [textarea.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [output.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [output.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [progress.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [progress.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "
7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "
7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "　7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "5%"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "+100"]
+    expected: FAIL
+
+  [progress.max: IDL set to -10000000000]
+    expected: FAIL
+
+  [progress.max: IDL set to -1]
+    expected: FAIL
+
+  [progress.max: IDL set to -0]
+    expected: FAIL
+
+  [progress.max: IDL set to 0]
+    expected: FAIL
+
+  [progress.max: IDL set to 1e-10]
+    expected: FAIL
+
+  [progress.max: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [meter.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [meter.value: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.value: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.value: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.value: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.min: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.min: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.min: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.min: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.max: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.max: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.max: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.max: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.low: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.low: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.low: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.low: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.high: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.high: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.high: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.high: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1e+25]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-grouping.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-grouping.html.ini
index b95b6ed5f64..a88cb136e80 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-grouping.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-grouping.html.ini
@@ -19826,3 +19826,135 @@
 
   [pre.autofocus: setAttribute() to object "[object Object\]"]
     expected: FAIL
+
+  [p.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [p.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [hr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [hr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [pre.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [pre.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "-"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "+"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [blockquote.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [blockquote.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ol.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ol.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "-"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "+"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ul.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ul.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [li.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [li.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dl.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dl.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dt.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dt.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dd.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dd.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [figure.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [figure.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [figcaption.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [figcaption.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [main.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [main.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [div.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [div.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-metadata.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-metadata.html.ini
index 3ab58f98a4c..6a297875d91 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-metadata.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-metadata.html.ini
@@ -11162,3 +11162,39 @@
 
   [meta.media: IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [head.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [head.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [title.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [title.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [base.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [base.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [link.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [link.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [meta.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [meta.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [style.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [style.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-misc.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-misc.html.ini
index 54cc357ea1b..b45513b4a46 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-misc.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-misc.html.ini
@@ -18497,3 +18497,75 @@
 
   [undefinedelement.enterKeyHint: setAttribute() to "previouſ"]
     expected: FAIL
+
+  [html.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [html.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [script.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [script.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [noscript.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [noscript.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [template.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [template.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [slot.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [slot.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ins.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ins.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [del.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [del.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [details.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [details.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [summary.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [summary.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [menu.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [menu.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dialog.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dialog.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [undefinedelement.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [undefinedelement.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-obsolete.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-obsolete.html.ini
index b1aeec624d8..496096c34b6 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-obsolete.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-obsolete.html.ini
@@ -16931,3 +16931,129 @@
 
   [font.autofocus: setAttribute() to 7]
     expected: FAIL
+
+  [marquee.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frameset.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frameset.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [frame.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frame.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dir.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dir.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [font.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [font.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-sections.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-sections.html.ini
index c186f2d668c..be4764a606a 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-sections.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-sections.html.ini
@@ -20639,3 +20639,93 @@
 
   [nav.autofocus: setAttribute() to " foo "]
     expected: FAIL
+
+  [body.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [body.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [article.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [article.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [section.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [section.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [nav.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [nav.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [aside.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [aside.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h1.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h1.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h2.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h2.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h3.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h3.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h4.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h4.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h5.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h5.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h6.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h6.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [hgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [hgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [header.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [header.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [footer.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [footer.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [address.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [address.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-tabular.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-tabular.html.ini
index 8299e7f00c8..a70beb478e2 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-tabular.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-tabular.html.ini
@@ -26684,3 +26684,111 @@
 
   [td.autofocus: IDL set to "5%"]
     expected: FAIL
+
+  [table.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [table.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [caption.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [caption.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [colgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [colgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "-"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "+"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [col.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [col.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "-"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "+"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tbody.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tbody.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [thead.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [thead.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [tfoot.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tfoot.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [tr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [td.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [td.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [th.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [th.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/reflection-text.html.ini b/tests/wpt/meta-legacy-layout/html/dom/reflection-text.html.ini
index 5bffc57d07f..516ce932d57 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/reflection-text.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/reflection-text.html.ini
@@ -33872,3 +33872,177 @@
 
   [a.referrerPolicy: setAttribute() to "origin-when-croſſ-origin"]
     expected: FAIL
+
+  [a.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [a.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [em.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [em.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [strong.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [strong.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [small.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [small.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [s.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [s.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [cite.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [cite.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [q.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [q.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dfn.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dfn.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [abbr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [abbr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ruby.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ruby.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [rt.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [rt.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [rp.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [rp.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [data.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [data.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [time.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [time.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [code.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [code.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [var.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [var.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [samp.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [samp.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [kbd.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [kbd.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [sub.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [sub.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [sup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [sup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [i.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [i.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [b.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [b.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [u.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [u.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [mark.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [mark.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [bdi.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [bdi.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [bdo.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [bdo.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [span.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [span.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [br.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [br.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [wbr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [wbr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini
new file mode 100644
index 00000000000..72a5f3a733f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini
@@ -0,0 +1,3 @@
+[autofocus-area.html]
+  [autofocus works on area element]
+    expected: FAIL
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 0cfee719c4e..9e6f4115b8c 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
@@ -1,7 +1,6 @@
 [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: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini
new file mode 100644
index 00000000000..4b24a0c097e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini
@@ -0,0 +1,6 @@
+[no-help-cursor-on-links-wrapped-in-svg.historical.html]
+  [Unvisited help links must have pointer cursor, not help cursor]
+    expected: FAIL
+
+  [Visited help links must have pointer cursor, not help cursor]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.html.ini
similarity index 88%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.html.ini
index 7869e7d909b..4528575dcb0 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-input-number.tentative.html]
+[field-sizing-input-number.html]
   [number: Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.html.ini
similarity index 98%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.html.ini
index 0b2f031b4a5..a1695393f0b 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-input-text.tentative.html]
+[field-sizing-input-text.html]
   [text: Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.html.ini
similarity index 90%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.html.ini
index 035ff8355e0..04312b75b80 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-select.tentative.html]
+[field-sizing-select.html]
   [dropdown: The width should depend on the selected OPTION]
     expected: FAIL
 
diff --git a/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.html.ini
similarity index 92%
rename from tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.html.ini
index f596dfc1538..624106a6a82 100644
--- a/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-textarea.tentative.html]
+[field-sizing-textarea.html]
   [Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/input-text-size.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/input-text-size.html.ini
index 8aeb35c22e1..95a23c77a7a 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/input-text-size.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/input-text-size.html.ini
@@ -1,3 +1,9 @@
 [input-text-size.html]
   [Size attribute value affects computed style]
     expected: FAIL
+
+  [Size attribute value affects layout-dependent computed style]
+    expected: FAIL
+
+  [Size attribute value is not a presentational hint]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/textarea-cols-rows.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/textarea-cols-rows.html.ini
index 721bdd39ab0..38a19fff773 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/textarea-cols-rows.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/textarea-cols-rows.html.ini
@@ -1,3 +1,9 @@
 [textarea-cols-rows.html]
   [Cols/rows attribute values affect computed style]
     expected: FAIL
+
+  [Cols/rows attribute values affect layout-dependent computed style]
+    expected: FAIL
+
+  [Cols/rows attribute values are not presentational hints]
+    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 841bafc6eca..26704422bbe 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
@@ -1,3 +1,4 @@
 [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: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/text-plain.window.js.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/text-plain.window.js.ini
index f6689f17d10..4d8c04fb3bd 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/text-plain.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/text-plain.window.js.ini
@@ -68,9 +68,6 @@
   [text/plain: \\r\\n in filename (normal form)]
     expected: FAIL
 
-  [text/plain: \\r\\n in filename (formdata event)]
-    expected: FAIL
-
   [text/plain: \\n\\r in filename (normal form)]
     expected: FAIL
 
@@ -146,9 +143,6 @@
   [text/plain: 0x00 in name (formdata event)]
     expected: FAIL
 
-  [text/plain: 0x00 in value (formdata event)]
-    expected: FAIL
-
   [text/plain: lone surrogate in name and value (normal form)]
     expected: FAIL
 
@@ -161,9 +155,6 @@
   [text/plain: double quote in name (formdata event)]
     expected: FAIL
 
-  [text/plain: \\n in value (normal form)]
-    expected: FAIL
-
   [text/plain: 0x00 in filename (formdata event)]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini
new file mode 100644
index 00000000000..a11ccafd91d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini
@@ -0,0 +1,2 @@
+[select-child-button-and-datalist.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
index 7e889fccc46..9702f2ea949 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
@@ -1,2 +1,15 @@
 [dialog-focus-previous-outside.html]
-  expected: ERROR
+  [Focus should not be restored if the currently focused element is not inside the dialog.]
+    expected: FAIL
+
+  [Focus restore should not occur when the focused element is in a shadowroot outside of the dialog.]
+    expected: FAIL
+
+  [Focus restore should occur when the focused element is in a shadowroot inside the dialog.]
+    expected: FAIL
+
+  [Focus restore should occur when the focused element is slotted into a dialog.]
+    expected: FAIL
+
+  [Focus restore should always occur for modal dialogs.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/popovers/popover-shadowhost-focus.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/popovers/popover-shadowhost-focus.html.ini
index 4add6ce5673..84547016f9b 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/popovers/popover-shadowhost-focus.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/popovers/popover-shadowhost-focus.html.ini
@@ -1,2 +1,12 @@
 [popover-shadowhost-focus.html]
-  expected: ERROR
+  [autofocus=true, delegatesfocus=false]
+    expected: FAIL
+
+  [autofocus=true, delegatesfocus=true]
+    expected: FAIL
+
+  [autofocus=false, delegatesfocus=false]
+    expected: FAIL
+
+  [autofocus=false, delegatesfocus=true]
+    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
new file mode 100644
index 00000000000..b8bdf33cb65
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/syntax/parsing/DOMContentLoaded-defer.html.ini
@@ -0,0 +1,3 @@
+[DOMContentLoaded-defer.html]
+  [The end: DOMContentLoaded and defer scripts]
+    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
deleted file mode 100644
index fc0233f5241..00000000000
--- a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-delayed.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[module-delayed.html]
-  [async document.write in a module]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.https.html.ini b/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.https.html.ini
index 54e3ef35665..32d149c8ae9 100644
--- a/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.https.html.ini
+++ b/tests/wpt/meta-legacy-layout/resource-timing/test_resource_timing.https.html.ini
@@ -68,3 +68,6 @@
 
   [PerformanceEntry has correct name, initiatorType, startTime, and duration (link)]
     expected: NOTRUN
+
+  [PerformanceEntry has correct name, initiatorType, startTime, and duration (img)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/selection/move-selection-range-into-different-root.tentative.html.ini b/tests/wpt/meta-legacy-layout/selection/move-selection-range-into-different-root.tentative.html.ini
new file mode 100644
index 00000000000..13f845aa56e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/selection/move-selection-range-into-different-root.tentative.html.ini
@@ -0,0 +1,48 @@
+[move-selection-range-into-different-root.tentative.html]
+  [Set selection range into a document fragment with selectNode]
+    expected: FAIL
+
+  [Set selection range into a sub-document with selectNode]
+    expected: FAIL
+
+  [Set selection range into a document fragment with selectNodeContents]
+    expected: FAIL
+
+  [Set selection range into a sub-document with selectNodeContents]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEnd]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEnd]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEndAfter]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEndAfter]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEndBefore]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEndBefore]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStart]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStart]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStartAfter]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStartAfter]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStartBefore]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStartBefore]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini b/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini
new file mode 100644
index 00000000000..36b2068c5a6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/xhr/xhr-timeout-longtask.any.js.ini
@@ -0,0 +1,6 @@
+[xhr-timeout-longtask.any.worker.html]
+  [Long tasks should not trigger load timeout]
+    expected: FAIL
+
+
+[xhr-timeout-longtask.any.html]
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index 959872cb954..a00e44c55ba 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -378,6 +378,13 @@
        {}
       ]
      ],
+     "remaining-invalid-objects.html": [
+      "fe117040665cc04041b70af3dcfc3ef593923b76",
+      [
+       null,
+       {}
+      ]
+     ],
      "removed-from-flat-tree.html": [
       "bc5726fed367a22b551fd3e8e00329a35e822fe8",
       [
@@ -617,6 +624,13 @@
       ]
      ],
      "crashtests": {
+      "add-pseudo-while-animating-001.html": [
+       "dc815658c5b22723965454495d227198e54fcf24",
+       [
+        null,
+        {}
+       ]
+      ],
       "replace-keyframes-animating-filter-001.html": [
        "e6355376f722062c4adb257ff627c5756b185517",
        [
@@ -1639,6 +1653,13 @@
          {}
         ]
        ],
+       "mathml-container-type-crash.html": [
+        "538c1b5445184d04257aaefd14b46c4f68b5f1be",
+        [
+         null,
+         {}
+        ]
+       ],
        "orthogonal-replaced-crash.html": [
         "10474fd9841e41e61069cf358b058e2abdc2537f",
         [
@@ -2328,6 +2349,13 @@
        ]
       ]
      },
+     "grid-table-cell-001-crash.html": [
+      "7b9c09e3af75246028a7e5766354040758432072",
+      [
+       null,
+       {}
+      ]
+     ],
      "parsing": {
       "grid-template-columns-crash.html": [
        "61bdfd8177a7343ce19cc24f97749cdc3ce3274b",
@@ -3558,6 +3586,13 @@
        {}
       ]
      ],
+     "ellipsis-with-image-crash.html": [
+      "42a18d0eb0ede5875e84f0cbf0012d5bc4814479",
+      [
+       null,
+       {}
+      ]
+     ],
      "multicol-in-orthogonal-writing-mode-crash.html": [
       "5a7378de2ea890fc2eefd91135c6cb299a7464ba",
       [
@@ -3631,7 +3666,14 @@
         {}
        ]
       ]
-     }
+     },
+     "trailing-declaration-crash.html": [
+      "54b9a13220112407d31097632e45fc94685d486e",
+      [
+       null,
+       {}
+      ]
+     ]
     },
     "css-paint-api": {
      "column-count-crash.https.html": [
@@ -4710,6 +4752,13 @@
        {}
       ]
      ],
+     "iframe-transition-destroyed-document-crash.html": [
+      "31f6a10ed62c8c0689b7eb5b6b3b8574c0e0fa8e",
+      [
+       null,
+       {}
+      ]
+     ],
      "list-style-position-style-change-crash.html": [
       "5910d5d95a1027646f7228449fd234cff7079a84",
       [
@@ -7927,6 +7976,15 @@
      ]
     },
     "text": {
+     "crashtests": {
+      "textlength-zwj-crash.svg": [
+       "547e919b7d00c4d4384b5dae6db89939ca2219f0",
+       [
+        null,
+        {}
+       ]
+      ]
+     },
      "reftests": {
       "text-display-contents-crash.html": [
        "04b6a7e7cf8c6714f6c51c75ef6355102089428e",
@@ -30833,6 +30891,396 @@
        {}
       ]
      ],
+     "monolithic-overflow-001-print.html": [
+      "f4121c3422582aad0bf12837270e696d06e68555",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-001-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-002-print.html": [
+      "8f76af16a9ea7a9a53d142d655d59c43100346d0",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-002-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-003-print.html": [
+      "76905b180a1232597b28c05ee3aac45690de13fa",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-004-print.html": [
+      "ea5a659bd8416a46fa3c2d1c69b68f7ea7f158bb",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-005-print.html": [
+      "bb0fc212fc0d8940363e7de9d1a3771fd90f2c57",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-006-print.html": [
+      "1cbcdbbe1e5a036a6eae8408731a15028aaae125",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-007-print.html": [
+      "14a6f051fec8489d957b14639bc3ccfcb0b644bd",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-008-print.html": [
+      "ff302dc30caa1999f9e09168feb5ac56c08af552",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-009-print.html": [
+      "bdff66e791c0fde0065578e1179085e76297d1d4",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-010-print.html": [
+      "a75c932d30b4133244ccfd7f695ff03a4870b3c3",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-011-print.html": [
+      "973a3aff4dccd49117247708413bf910b8406518",
+      [
+       null,
+       [
+        [
+         "/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-012-print.html": [
+      "53ed74bc7289cffacd1ec7f34b9d4e14060de6b5",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-012-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-013-print.html": [
+      "b9a174879d77d139688031724fa1b1a5093e78d3",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-013-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-014-print.html": [
+      "d12ddf4c6847ed3b6ac980e4c327ae4b77a7d148",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-014-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-015-print.html": [
+      "d52605605c93eece74a0c4e78669aeb5a8ffbbdb",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-015-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-016-print.html": [
+      "029523e924afb21bf190420f95062214127fae61",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-016-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-017-print.html": [
+      "c8ce9060fffcee8a79f265e1182e0c0cd9c2e7ae",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-017-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-018-print.html": [
+      "93da11dc62e73e2a98a275ec71f56579e1f1a604",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-018-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-019-print.html": [
+      "3740b5d5b0b954f403954e2120db6a0ca32ce1c5",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-019-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-020-print.html": [
+      "403d932d643b81a620df3eba64156d1431d14579",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-020-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-021-print.html": [
+      "584c4943dcf16e1713c93a6b482b858076163842",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-021-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-022-print.html": [
+      "d37c74ad8ac33a3f767e962dee71858f491c0071",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-022-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-023-print.html": [
+      "c047d4865751892503c5b8341b5c3a79eb7ad5f5",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-023-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-024-print.html": [
+      "6153bc98ae0534573817663c232fb4dbadf10116",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-024-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-025-print.html": [
+      "3fefbc37e2ecd38e2a88847c9132c49398d322fe",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-025-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-026-print.html": [
+      "966391e43bbc015075eee64c6203641157ac7059",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-026-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-027-print.html": [
+      "c7cfd37e2e882a3d6a860fd854001e44b699c7c5",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-027-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-028-print.html": [
+      "c549db6410daef1ec89f71348b3da4b462c3111e",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-028-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-029-print.html": [
+      "c869d87d6839fe230d039d39142da710b8dd0d3d",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-029-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-030-print.html": [
+      "e36f25434dfc2466b1d4dad840914d4909df4918",
+      [
+       null,
+       [
+        [
+         "/css/css-page/monolithic-overflow-030-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "page-left-right-001-print.html": [
       "044696fcca27ec7ebe18edab3053dfbb65af6bbc",
       [
@@ -32033,344 +32481,6 @@
        {}
       ]
      ],
-     "monolithic-overflow-001-print.html": [
-      "f4121c3422582aad0bf12837270e696d06e68555",
-      [
-       null,
-       [
-        [
-         "/css/printing/monolithic-overflow-001-print-ref.html",
-         "=="
-        ]
-       ],
-       {}
-      ]
-     ],
-     "monolithic-overflow-002-print.html": [
-      "8f76af16a9ea7a9a53d142d655d59c43100346d0",
-      [
-       null,
-       [
-        [
-         "/css/printing/monolithic-overflow-002-print-ref.html",
-         "=="
-        ]
-       ],
-       {}
-      ]
-     ],
-     "monolithic-overflow-003-print.html": [
-      "76905b180a1232597b28c05ee3aac45690de13fa",
-      [
-       null,
-       [
-        [
-         "/css/printing/reference/monolithic-overflow-4-pages-print-ref.html",
-         "=="
-        ]
-       ],
-       {}
-      ]
-     ],
-     "monolithic-overflow-004-print.html": [
-      "ea5a659bd8416a46fa3c2d1c69b68f7ea7f158bb",
-      [
-       null,
-       [
-        [
-         "/css/printing/reference/monolithic-overflow-4-pages-print-ref.html",
-         "=="
-        ]
-       ],
-       {}
-      ]
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      ]
     ],
-    "non-fully-active.tentative.https.html": [
+    "non-fully-active.https.html": [
      "56a5372044daaca92297b9d19871fa4d7f82fae7",
      [
       null,
       {}
      ]
     ],
-    "non-secure-context.tentative.any.js": [
+    "non-secure-context.any.js": [
      "94553591f372492a1d1085d6edf23715872c0d83",
      [
-      "web-locks/non-secure-context.tentative.any.html",
+      "web-locks/non-secure-context.any.html",
       {
        "script_metadata": [
         [
@@ -746241,7 +746374,7 @@
       }
      ],
      [
-      "web-locks/non-secure-context.tentative.any.sharedworker.html",
+      "web-locks/non-secure-context.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746256,7 +746389,7 @@
       }
      ],
      [
-      "web-locks/non-secure-context.tentative.any.worker.html",
+      "web-locks/non-secure-context.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746271,7 +746404,7 @@
       }
      ]
     ],
-    "opaque-origin.tentative.https.html": [
+    "opaque-origin.https.html": [
      "3ba636ecd8040b5b1b9d8b441176d50b791a6582",
      [
       null,
@@ -746285,10 +746418,10 @@
       {}
      ]
     ],
-    "query-empty.tentative.https.any.js": [
+    "query-empty.https.any.js": [
      "88ffdb7f810d6d3e698a507da97220684ad3ecfe",
      [
-      "web-locks/query-empty.tentative.https.any.html",
+      "web-locks/query-empty.https.any.html",
       {
        "script_metadata": [
         [
@@ -746307,7 +746440,7 @@
       }
      ],
      [
-      "web-locks/query-empty.tentative.https.any.serviceworker.html",
+      "web-locks/query-empty.https.any.serviceworker.html",
       {
        "script_metadata": [
         [
@@ -746326,7 +746459,7 @@
       }
      ],
      [
-      "web-locks/query-empty.tentative.https.any.sharedworker.html",
+      "web-locks/query-empty.https.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746345,7 +746478,7 @@
       }
      ],
      [
-      "web-locks/query-empty.tentative.https.any.worker.html",
+      "web-locks/query-empty.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746364,17 +746497,17 @@
       }
      ]
     ],
-    "query-ordering.tentative.https.html": [
+    "query-ordering.https.html": [
      "d5e722baf75b6b4a77bf0943ddecd620499dc03a",
      [
       null,
       {}
      ]
     ],
-    "query.tentative.https.any.js": [
+    "query.https.any.js": [
      "14fdeca7a426c44ac9027a3a2494e235d0ac1844",
      [
-      "web-locks/query.tentative.https.any.html",
+      "web-locks/query.https.any.html",
       {
        "script_metadata": [
         [
@@ -746389,7 +746522,7 @@
       }
      ],
      [
-      "web-locks/query.tentative.https.any.worker.html",
+      "web-locks/query.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746404,10 +746537,10 @@
       }
      ]
     ],
-    "resource-names.tentative.https.any.js": [
+    "resource-names.https.any.js": [
      "1031b3f7ba2e34129870db73088be0bc384ab2f8",
      [
-      "web-locks/resource-names.tentative.https.any.html",
+      "web-locks/resource-names.https.any.html",
       {
        "script_metadata": [
         [
@@ -746422,7 +746555,7 @@
       }
      ],
      [
-      "web-locks/resource-names.tentative.https.any.serviceworker.html",
+      "web-locks/resource-names.https.any.serviceworker.html",
       {
        "script_metadata": [
         [
@@ -746437,7 +746570,7 @@
       }
      ],
      [
-      "web-locks/resource-names.tentative.https.any.sharedworker.html",
+      "web-locks/resource-names.https.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746452,7 +746585,7 @@
       }
      ],
      [
-      "web-locks/resource-names.tentative.https.any.worker.html",
+      "web-locks/resource-names.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746467,10 +746600,10 @@
       }
      ]
     ],
-    "secure-context.tentative.https.any.js": [
+    "secure-context.https.any.js": [
      "29ae7aea475f2db169718507431adb4c6ff78eeb",
      [
-      "web-locks/secure-context.tentative.https.any.html",
+      "web-locks/secure-context.https.any.html",
       {
        "script_metadata": [
         [
@@ -746485,7 +746618,7 @@
       }
      ],
      [
-      "web-locks/secure-context.tentative.https.any.serviceworker.html",
+      "web-locks/secure-context.https.any.serviceworker.html",
       {
        "script_metadata": [
         [
@@ -746500,7 +746633,7 @@
       }
      ],
      [
-      "web-locks/secure-context.tentative.https.any.sharedworker.html",
+      "web-locks/secure-context.https.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746515,7 +746648,7 @@
       }
      ],
      [
-      "web-locks/secure-context.tentative.https.any.worker.html",
+      "web-locks/secure-context.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746530,10 +746663,10 @@
       }
      ]
     ],
-    "signal.tentative.https.any.js": [
+    "signal.https.any.js": [
      "5a37e3ae87182eb2ea1909c9e5e29b3f50fd248b",
      [
-      "web-locks/signal.tentative.https.any.html",
+      "web-locks/signal.https.any.html",
       {
        "script_metadata": [
         [
@@ -746552,7 +746685,7 @@
       }
      ],
      [
-      "web-locks/signal.tentative.https.any.serviceworker.html",
+      "web-locks/signal.https.any.serviceworker.html",
       {
        "script_metadata": [
         [
@@ -746571,7 +746704,7 @@
       }
      ],
      [
-      "web-locks/signal.tentative.https.any.sharedworker.html",
+      "web-locks/signal.https.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746590,7 +746723,7 @@
       }
      ],
      [
-      "web-locks/signal.tentative.https.any.worker.html",
+      "web-locks/signal.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746609,10 +746742,10 @@
       }
      ]
     ],
-    "steal.tentative.https.any.js": [
+    "steal.https.any.js": [
      "d165b9d179fb14ac9843401db6b8ee07c9470afe",
      [
-      "web-locks/steal.tentative.https.any.html",
+      "web-locks/steal.https.any.html",
       {
        "script_metadata": [
         [
@@ -746631,7 +746764,7 @@
       }
      ],
      [
-      "web-locks/steal.tentative.https.any.serviceworker.html",
+      "web-locks/steal.https.any.serviceworker.html",
       {
        "script_metadata": [
         [
@@ -746650,7 +746783,7 @@
       }
      ],
      [
-      "web-locks/steal.tentative.https.any.sharedworker.html",
+      "web-locks/steal.https.any.sharedworker.html",
       {
        "script_metadata": [
         [
@@ -746669,7 +746802,7 @@
       }
      ],
      [
-      "web-locks/steal.tentative.https.any.worker.html",
+      "web-locks/steal.https.any.worker.html",
       {
        "script_metadata": [
         [
@@ -746783,7 +746916,7 @@
       }
      ]
     ],
-    "workers.tentative.https.html": [
+    "workers.https.html": [
      "9fe38dbe38c798bf39aac0bd79a5dbabbcebfc68",
      [
       null,
@@ -748708,7 +748841,7 @@
        ]
       ],
       "osc-basic-waveform.html": [
-       "b34c96855fdbb26428c64ed879d41ec787fb8d85",
+       "abd1ff8d0e5d8453bfbfd1e37dc7c36ef4337f40",
        [
         null,
         {}
@@ -760061,7 +760194,7 @@
      ]
     ],
     "RTCConfiguration-iceServers.html": [
-     "1893ba02f3042abe14db2cce50903f917b9280ff",
+     "d344cce9f862a07034aeaeb96ab4012f0bab6eca",
      [
       null,
       {}
@@ -806646,7 +806779,7 @@
          ]
         ],
         "user_context.py": [
-         "3a5f7f6c05bfb1ddaad007066e17fb316d2bb04c",
+         "98d6a2e2c8bfc7a9bf0600017ed9f9729d2836f3",
          [
           null,
           {}
@@ -806742,7 +806875,7 @@
        },
        "context_created": {
         "context_created.py": [
-         "dda9b2dae0e4b2165ced50dd75bf8c693c6f081c",
+         "e8b7fc5f894c8186c44e8ecdda7210952d8147ce",
          [
           null,
           {}
@@ -806751,7 +806884,7 @@
        },
        "context_destroyed": {
         "context_destroyed.py": [
-         "1e918713779adca821b277162ace6875730e3f71",
+         "17f7acf2f9b68911b1c9fb2cf882918edf894a6a",
          [
           null,
           {}
@@ -806767,14 +806900,14 @@
          ]
         ],
         "invalid.py": [
-         "de9d2963efb5309972a73a83f1635401c03a6606",
+         "3f2cc886d0e8ace5476e55102fb141a18b45a055",
          [
           null,
           {}
          ]
         ],
         "reference_context.py": [
-         "ffc95ef41ca4390aa0cc8db4f768929a5da652a0",
+         "6b7fd8b2be1b1c1051d4f68df56c087066db86eb",
          [
           null,
           {}
@@ -806788,7 +806921,7 @@
          ]
         ],
         "user_context.py": [
-         "64ffb1f7d85b1202e8051acbce8d69955395316e",
+         "51406262fc85e431be241570595dfc5992628188",
          [
           null,
           {}
@@ -806822,7 +806955,7 @@
        },
        "get_tree": {
         "frames.py": [
-         "fae7f00a05c6ada139f63666f7c04146b95cbbe8",
+         "81c664740c1e8c11ae3c798f302b6e32881117c5",
          [
           null,
           {}
@@ -807465,7 +807598,16 @@
        },
        "continue_request": {
         "invalid.py": [
-         "cdc66cfaabb20dde4bd3e3caa0c8c8d948fe87f6",
+         "d7cfa629c0851671e260f76b4b8a9ae28bb34f2d",
+         [
+          null,
+          {
+           "timeout": "long"
+          }
+         ]
+        ],
+        "request.py": [
+         "c55e477ad7475060708c27eafe6b8711dfb9ccdb",
          [
           null,
           {}
@@ -807473,8 +807615,24 @@
         ]
        },
        "continue_response": {
+        "credentials.py": [
+         "3e595722cc381e704210f0bc4cdb9d6ec7aa79db",
+         [
+          null,
+          {}
+         ]
+        ],
         "invalid.py": [
-         "b8e1c08e0125fd16d405a9d07848db8a25adc47a",
+         "2b59b3acc636e8b9cab4f729f727855750b6312f",
+         [
+          null,
+          {
+           "timeout": "long"
+          }
+         ]
+        ],
+        "request.py": [
+         "579f1da2882559ce5d0c2030d48b9be06f7917e5",
          [
           null,
           {}
@@ -807515,7 +807673,7 @@
        },
        "fetch_error": {
         "fetch_error.py": [
-         "35e78d8d02eba377eb97affab0dba2cb8d47269d",
+         "025da87c928df9a2966a08a31884d83304d57f0a",
          [
           null,
           {}
@@ -807956,7 +808114,7 @@
        },
        "realm_created": {
         "realm_created.py": [
-         "25fbbfc9f61944663a461603594117988fc672e8",
+         "f4dc681a3a2edf4aaa7b513137acb09bd0c2e65f",
          [
           null,
           {}
@@ -807965,7 +808123,7 @@
        },
        "realm_destroyed": {
         "realm_destroyed.py": [
-         "15309f7aba06001ac7d2adf8956cab330f8c6f5f",
+         "ac3a67ec74276febc25f2d7ce20b18fa90f7bb28",
          [
           null,
           {}
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 1a23521baff..d62a72d17db 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
@@ -113,9 +113,6 @@
   [Matching font-style: 'oblique -21deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
     expected: FAIL
 
-  [Matching font-weight: '430' should prefer '450 460' over '500']
-    expected: FAIL
-
   [Matching font-stretch: '90%' should prefer '110% 140%' over '120% 130%']
     expected: FAIL
 
@@ -209,9 +206,6 @@
   [Matching font-style: 'oblique 10deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -21deg' should prefer 'oblique -21deg' over 'oblique -60deg -40deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 20deg' should prefer 'oblique 20deg' over 'oblique 30deg 60deg']
     expected: FAIL
 
@@ -251,9 +245,6 @@
   [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 -20deg' should prefer 'oblique -20deg' over 'oblique -60deg -40deg']
     expected: FAIL
 
@@ -275,9 +266,6 @@
   [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
 
@@ -286,3 +274,42 @@
 
   [Matching font-style: 'oblique -20deg' should prefer 'oblique 0deg' over 'oblique 30deg 60deg']
     expected: FAIL
+
+  [Matching font-weight: '400' should prefer '351 398' over '501 550']
+    expected: FAIL
+
+  [Matching font-weight: '430' should prefer '501 550' over '502 560']
+    expected: FAIL
+
+  [Matching font-weight: '500' should prefer '500' over '450 460']
+    expected: FAIL
+
+  [Matching font-weight: '500' should prefer '450 460' over '400']
+    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-style: 'normal' should prefer 'oblique 10deg 40deg' over 'oblique 20deg 30deg']
+    expected: FAIL
+
+  [Matching font-style: 'normal' should prefer 'oblique 20deg 30deg' over 'oblique -50deg -20deg']
+    expected: FAIL
+
+  [Matching font-style: 'italic' should prefer 'oblique 40deg 50deg' over 'oblique 5deg 10deg']
+    expected: FAIL
+
+  [Matching font-style: 'italic' should prefer 'oblique 5deg' over 'normal']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'italic' over 'oblique 0deg']
+    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 -50deg -40deg' over 'italic']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-position/overlay/overlay-transition-property.html.ini b/tests/wpt/meta/css/css-position/overlay/overlay-transition-property.html.ini
new file mode 100644
index 00000000000..8a492ea5596
--- /dev/null
+++ b/tests/wpt/meta/css/css-position/overlay/overlay-transition-property.html.ini
@@ -0,0 +1,6 @@
+[overlay-transition-property.html]
+  [e.style['transition'\] = "overlay 2s" should set the property value]
+    expected: FAIL
+
+  [Property transition value 'overlay 1s']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-001.html.ini b/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-001.html.ini
deleted file mode 100644
index eafc8f6012c..00000000000
--- a/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-001.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[eol-spaces-bidi-001.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-004.html.ini b/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-004.html.ini
new file mode 100644
index 00000000000..82d8fad549e
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/white-space/eol-spaces-bidi-004.html.ini
@@ -0,0 +1,2 @@
+[eol-spaces-bidi-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-transitions/parsing/transition-valid.html.ini b/tests/wpt/meta/css/css-transitions/parsing/transition-valid.html.ini
new file mode 100644
index 00000000000..556b9947f92
--- /dev/null
+++ b/tests/wpt/meta/css/css-transitions/parsing/transition-valid.html.ini
@@ -0,0 +1,24 @@
+[transition-valid.html]
+  [e.style['transition'\] = "1s" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "cubic-bezier(0, -2, 1, 3)" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "1s -3s" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "none" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "top" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "1s -3s, cubic-bezier(0, -2, 1, 3) top" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "all" should set the property value]
+    expected: FAIL
+
+  [e.style['transition'\] = "all 1s" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini b/tests/wpt/meta/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini
new file mode 100644
index 00000000000..0a3d25827ee
--- /dev/null
+++ b/tests/wpt/meta/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html.ini
@@ -0,0 +1,168 @@
+[calc-size-width-interpolation.tentative.html]
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (-0.25) should be [150px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0) should be [200px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.25) should be [calc-size(auto, size * 1.25)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.5) should be [calc-size(auto, size * 1.5)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (0.75) should be [calc-size(auto, size * 1.75)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1) should be [calc-size(auto, size * 2)\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from neutral to [calc-size(auto, size * 2)\] at (1.25) should be [calc-size(auto, size * 2.25)\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Transitions: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Transitions with transition: all: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [CSS Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (-0.25) should be [0\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0) should be [0\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.25) should be [25px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.5) should be [50px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (0.75) should be [75px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1) should be [100px\]]
+    expected: FAIL
+
+  [Web Animations: property <width> from [calc-size(min-content, 0px)\] to [calc-size(min-content, size)\] at (1.25) should be [125px\]]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/calc-size/calc-size-parsing.tentative.html.ini b/tests/wpt/meta/css/css-values/calc-size/calc-size-parsing.tentative.html.ini
new file mode 100644
index 00000000000..24d7ae6ee1d
--- /dev/null
+++ b/tests/wpt/meta/css/css-values/calc-size/calc-size-parsing.tentative.html.ini
@@ -0,0 +1,42 @@
+[calc-size-parsing.tentative.html]
+  [e.style['width'\] = "calc-size(fit-content, size)" should set the property value]
+    expected: FAIL
+
+  [e.style['height'\] = "calc-size(min-content, size * 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['max-width'\] = "calc-size(max-content, size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['max-height'\] = "calc-size(fit-content, 30px + size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(fit-content, 50% + size / 2)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 40%)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, 50px + 30%)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(any, calc-size(10px, sign(size) * size))" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(30px, 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(any, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(2in, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(min-content, 30px), 25em)" should set the property value]
+    expected: FAIL
+
+  [e.style['width'\] = "calc-size(calc-size(min-content, size), size)" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/calc-size/calc-size-width.tentative.html.ini b/tests/wpt/meta/css/css-values/calc-size/calc-size-width.tentative.html.ini
new file mode 100644
index 00000000000..6564bc8fa9d
--- /dev/null
+++ b/tests/wpt/meta/css/css-values/calc-size/calc-size-width.tentative.html.ini
@@ -0,0 +1,2 @@
+[calc-size-width.tentative.html]
+  expected: ERROR
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 ee625a151a4..037d7e0f951 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
@@ -4,6 +4,3 @@
 
   [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/offsetTopLeft-table-caption.html.ini b/tests/wpt/meta/css/cssom-view/offsetTopLeft-table-caption.html.ini
new file mode 100644
index 00000000000..131155bb1ab
--- /dev/null
+++ b/tests/wpt/meta/css/cssom-view/offsetTopLeft-table-caption.html.ini
@@ -0,0 +1,3 @@
+[offsetTopLeft-table-caption.html]
+  [offset* APIs on tables with captions.]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/cssom-view/scroll-zoom.html.ini b/tests/wpt/meta/css/cssom-view/scroll-zoom.html.ini
index db32ece8e06..c281ce87f70 100644
--- a/tests/wpt/meta/css/cssom-view/scroll-zoom.html.ini
+++ b/tests/wpt/meta/css/cssom-view/scroll-zoom.html.ini
@@ -1,3 +1,6 @@
 [scroll-zoom.html]
   [scroll properties for elements with css zoom 1]
     expected: FAIL
+
+  [scroll{Width, Height}]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-forEach.any.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-forEach.any.js.ini
new file mode 100644
index 00000000000..933ec347650
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-forEach.any.js.ini
@@ -0,0 +1,38 @@
+[observable-forEach.any.html]
+  [forEach(): Visitor callback called synchronously for each value]
+    expected: FAIL
+
+  [Errors thrown by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors pushed by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors thrown in the visitor callback reject the promise and unsubscribe from the source]
+    expected: FAIL
+
+  [forEach visitor callback rejection microtask ordering]
+    expected: FAIL
+
+  [forEach() promise resolves with undefined]
+    expected: FAIL
+
+
+[observable-forEach.any.worker.html]
+  [forEach(): Visitor callback called synchronously for each value]
+    expected: FAIL
+
+  [Errors thrown by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors pushed by Observable reject the returned promise]
+    expected: FAIL
+
+  [Errors thrown in the visitor callback reject the promise and unsubscribe from the source]
+    expected: FAIL
+
+  [forEach visitor callback rejection microtask ordering]
+    expected: FAIL
+
+  [forEach() promise resolves with undefined]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-forEach.window.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-forEach.window.js.ini
new file mode 100644
index 00000000000..7c894bf3997
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-forEach.window.js.ini
@@ -0,0 +1,6 @@
+[observable-forEach.window.html]
+  [forEach()'s internal observer's next steps do not crash in a detached document]
+    expected: FAIL
+
+  [forEach()'s internal observer's next steps do not crash when visitor callback detaches the document]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/traversal/NodeIterator-removal.html.ini b/tests/wpt/meta/dom/traversal/NodeIterator-removal.html.ini
index 3324002afc2..591353adfb0 100644
--- a/tests/wpt/meta/dom/traversal/NodeIterator-removal.html.ini
+++ b/tests/wpt/meta/dom/traversal/NodeIterator-removal.html.ini
@@ -64,3 +64,6 @@
 
   [Test removing node xmlDoctype]
     expected: FAIL
+
+  [Test removing node paras[5\].firstChild]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/api/request/request-constructor-init-body-override.any.js.ini b/tests/wpt/meta/fetch/api/request/request-constructor-init-body-override.any.js.ini
new file mode 100644
index 00000000000..7881e87755a
--- /dev/null
+++ b/tests/wpt/meta/fetch/api/request/request-constructor-init-body-override.any.js.ini
@@ -0,0 +1,8 @@
+[request-constructor-init-body-override.any.worker.html]
+  [Check that the body of a new request can be overridden when created from an existing Request object]
+    expected: FAIL
+
+
+[request-constructor-init-body-override.any.html]
+  [Check that the body of a new request can be overridden when created from an existing Request object]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/bad-gzip-body.any.js.ini b/tests/wpt/meta/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/fetch/content-encoding/bad-gzip-body.any.js.ini
rename to tests/wpt/meta/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
index a1747fc347d..24a7b7bcc7f 100644
--- a/tests/wpt/meta-legacy-layout/fetch/content-encoding/bad-gzip-body.any.js.ini
+++ b/tests/wpt/meta/fetch/content-encoding/gzip/bad-gzip-body.any.js.ini
@@ -1,4 +1,4 @@
-[bad-gzip-body.any.worker.html]
+[bad-gzip-body.any.html]
   [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
     expected: FAIL
 
@@ -12,7 +12,7 @@
     expected: FAIL
 
 
-[bad-gzip-body.any.html]
+[bad-gzip-body.any.worker.html]
   [Consuming the body of a resource with bad gzip content with arrayBuffer() should reject]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/big-gzip-body.https.any.js.ini b/tests/wpt/meta/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
similarity index 99%
rename from tests/wpt/meta-legacy-layout/fetch/content-encoding/big-gzip-body.https.any.js.ini
rename to tests/wpt/meta/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
index 122d36c427c..625d6f9c017 100644
--- a/tests/wpt/meta-legacy-layout/fetch/content-encoding/big-gzip-body.https.any.js.ini
+++ b/tests/wpt/meta/fetch/content-encoding/gzip/big-gzip-body.https.any.js.ini
@@ -1,3 +1,6 @@
+[big-gzip-body.https.any.serviceworker.html]
+  expected: ERROR
+
 [big-gzip-body.https.any.worker.html]
   [large gzip data should be decompressed successfully]
     expected: FAIL
@@ -6,15 +9,13 @@
     expected: FAIL
 
 
-[big-gzip-body.https.any.serviceworker.html]
-  expected: ERROR
-
-[big-gzip-body.https.any.sharedworker.html]
-  expected: ERROR
-
 [big-gzip-body.https.any.html]
   [large gzip data should be decompressed successfully]
     expected: FAIL
 
   [large gzip data should be decompressed successfully with byte stream]
     expected: FAIL
+
+
+[big-gzip-body.https.any.sharedworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip-body.any.js.ini b/tests/wpt/meta/fetch/content-encoding/gzip/gzip-body.any.js.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip-body.any.js.ini
rename to tests/wpt/meta/fetch/content-encoding/gzip/gzip-body.any.js.ini
index d5da6f1f58a..2003b949db7 100644
--- a/tests/wpt/meta-legacy-layout/fetch/content-encoding/gzip-body.any.js.ini
+++ b/tests/wpt/meta/fetch/content-encoding/gzip/gzip-body.any.js.ini
@@ -1,3 +1,5 @@
+[gzip-body.any.worker.html]
+
 [gzip-body.any.sharedworker.html]
   expected: ERROR
 
@@ -5,5 +7,3 @@
 
 [gzip-body.any.serviceworker.html]
   expected: ERROR
-
-[gzip-body.any.worker.html]
diff --git a/tests/wpt/meta/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini b/tests/wpt/meta/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..ed17fcbaf81
--- /dev/null
+++ b/tests/wpt/meta/fetch/content-encoding/zstd/bad-zstd-body.https.any.js.ini
@@ -0,0 +1,33 @@
+[bad-zstd-body.https.any.html]
+  [Consuming the body of a resource with bad zstd content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with text() should reject]
+    expected: FAIL
+
+
+[bad-zstd-body.https.any.worker.html]
+  [Consuming the body of a resource with bad zstd content with arrayBuffer() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with blob() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with json() should reject]
+    expected: FAIL
+
+  [Consuming the body of a resource with bad zstd content with text() should reject]
+    expected: FAIL
+
+
+[bad-zstd-body.https.any.sharedworker.html]
+  expected: ERROR
+
+[bad-zstd-body.https.any.serviceworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini b/tests/wpt/meta/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini
new file mode 100644
index 00000000000..d92c7bb0efb
--- /dev/null
+++ b/tests/wpt/meta/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js.ini
@@ -0,0 +1,15 @@
+[big-window-zstd-body.tentative.https.any.serviceworker.html]
+  expected: ERROR
+
+[big-window-zstd-body.tentative.https.any.html]
+  [Consuming the body of a resource with too large of a zstd window size should reject]
+    expected: FAIL
+
+
+[big-window-zstd-body.tentative.https.any.worker.html]
+  [Consuming the body of a resource with too large of a zstd window size should reject]
+    expected: FAIL
+
+
+[big-window-zstd-body.tentative.https.any.sharedworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini b/tests/wpt/meta/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..72b80704150
--- /dev/null
+++ b/tests/wpt/meta/fetch/content-encoding/zstd/big-zstd-body.https.any.js.ini
@@ -0,0 +1,21 @@
+[big-zstd-body.https.any.serviceworker.html]
+  expected: ERROR
+
+[big-zstd-body.https.any.worker.html]
+  [large zstd data should be decompressed successfully]
+    expected: FAIL
+
+  [large zstd data should be decompressed successfully with byte stream]
+    expected: FAIL
+
+
+[big-zstd-body.https.any.html]
+  [large zstd data should be decompressed successfully]
+    expected: FAIL
+
+  [large zstd data should be decompressed successfully with byte stream]
+    expected: FAIL
+
+
+[big-zstd-body.https.any.sharedworker.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/fetch/content-encoding/zstd/zstd-body.https.any.js.ini b/tests/wpt/meta/fetch/content-encoding/zstd/zstd-body.https.any.js.ini
new file mode 100644
index 00000000000..3040041a6b4
--- /dev/null
+++ b/tests/wpt/meta/fetch/content-encoding/zstd/zstd-body.https.any.js.ini
@@ -0,0 +1,20 @@
+[zstd-body.https.any.serviceworker.html]
+  expected: ERROR
+
+[zstd-body.https.any.html]
+  [fetched zstd data with content type text should be decompressed.]
+    expected: FAIL
+
+  [fetched zstd data with content type octetstream should be decompressed.]
+    expected: FAIL
+
+
+[zstd-body.https.any.sharedworker.html]
+  expected: ERROR
+
+[zstd-body.https.any.worker.html]
+  [fetched zstd data with content type text should be decompressed.]
+    expected: FAIL
+
+  [fetched zstd data with content type octetstream should be decompressed.]
+    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 cc2c0a353cd..4648085f98d 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: FAIL
+    expected: TIMEOUT
 
   [sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes]
-    expected: FAIL
+    expected: NOTRUN
 
   [sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes]
-    expected: TIMEOUT
+    expected: NOTRUN
 
   [sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes]
     expected: NOTRUN
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 149bcb4ff8c..b8fd22e2b81 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
@@ -10,3 +10,6 @@
 
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
     expected: FAIL
+
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='']
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
index 5aef7ce66ce..324db3d9b35 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html.ini
@@ -10,6 +10,3 @@
 
   [load event does not fire on window.open('about:blank?foo')]
     expected: FAIL
-
-  [load event does not fire on window.open('about:blank')]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-referrer.window.js.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-referrer.window.js.ini
index bcda478adb1..d203e3d160a 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-referrer.window.js.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-referrer.window.js.ini
@@ -4,7 +4,7 @@
     expected: FAIL
 
   [origin referrer policy used to create the starting page]
-    expected: FAIL
+    expected: TIMEOUT
 
   [no-referrer referrer policy used to create the starting page]
-    expected: TIMEOUT
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
new file mode 100644
index 00000000000..60a4fa51f8a
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html.ini
@@ -0,0 +1,3 @@
+[a-click.html]
+  [aElement.click() before the load event must NOT replace]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
new file mode 100644
index 00000000000..7a5fcb79165
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/history/the-history-interface/traverse_the_history_5.html.ini
@@ -0,0 +1,3 @@
+[traverse_the_history_5.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
new file mode 100644
index 00000000000..4b4820d1729
--- /dev/null
+++ b/tests/wpt/meta/html/browsers/the-window-object/open-close/creating_browsing_context_test_01.html.ini
@@ -0,0 +1,3 @@
+[creating_browsing_context_test_01.html]
+  [first argument: absolute url]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-forms-weekmonth.html.ini b/tests/wpt/meta/html/dom/reflection-forms-weekmonth.html.ini
index 2db2eec8f23..3e3cdd4956c 100644
--- a/tests/wpt/meta/html/dom/reflection-forms-weekmonth.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-forms-weekmonth.html.ini
@@ -643,3 +643,9 @@
 
   [input.useMap: IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [input.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-forms.html.ini b/tests/wpt/meta/html/dom/reflection-forms.html.ini
index 1fb3992d744..2d6cc6d9326 100644
--- a/tests/wpt/meta/html/dom/reflection-forms.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-forms.html.ini
@@ -5101,3 +5101,252 @@
 
   [meter.optimum: IDL set to 10000000000]
     expected: FAIL
+
+  [form.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [form.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [fieldset.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [fieldset.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [legend.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [legend.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [label.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [label.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [input.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [button.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [button.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [select.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [select.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [datalist.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [datalist.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [optgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [optgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [option.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [option.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [textarea.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [textarea.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [output.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [output.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [progress.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [progress.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "
7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "
7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " 7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "　7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "5%"]
+    expected: FAIL
+
+  [progress.max: setAttribute() to "+100"]
+    expected: FAIL
+
+  [progress.max: IDL set to -10000000000]
+    expected: FAIL
+
+  [progress.max: IDL set to -1]
+    expected: FAIL
+
+  [progress.max: IDL set to -0]
+    expected: FAIL
+
+  [progress.max: IDL set to 0]
+    expected: FAIL
+
+  [progress.max: IDL set to 1e-10]
+    expected: FAIL
+
+  [progress.max: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [meter.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [meter.value: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.value: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.value: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.value: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.min: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.min: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.min: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.min: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.max: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.max: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.max: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.max: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.low: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.low: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.low: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.low: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.high: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.high: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.high: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.high: IDL set to 1e+25]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1e-10]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 0.0001]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1.5]
+    expected: FAIL
+
+  [meter.optimum: IDL set to 1e+25]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-grouping.html.ini b/tests/wpt/meta/html/dom/reflection-grouping.html.ini
index 5f0e2f78444..20bdfa50953 100644
--- a/tests/wpt/meta/html/dom/reflection-grouping.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-grouping.html.ini
@@ -5932,3 +5932,135 @@
 
   [div.tabIndex: IDL set to -2147483648]
     expected: FAIL
+
+  [p.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [p.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [hr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [hr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [pre.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [pre.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "-"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "+"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [pre.width: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [blockquote.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [blockquote.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ol.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ol.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "-"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "+"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [ol.start: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ul.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ul.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [li.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [li.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dl.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dl.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dt.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dt.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dd.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dd.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [figure.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [figure.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [figcaption.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [figcaption.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [main.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [main.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [div.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [div.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-metadata.html.ini b/tests/wpt/meta/html/dom/reflection-metadata.html.ini
index a290a3a95b8..c180c200554 100644
--- a/tests/wpt/meta/html/dom/reflection-metadata.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-metadata.html.ini
@@ -3388,3 +3388,39 @@
 
   [style.type: IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [head.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [head.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [title.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [title.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [base.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [base.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [link.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [link.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [meta.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [meta.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [style.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [style.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-misc.html.ini b/tests/wpt/meta/html/dom/reflection-misc.html.ini
index b9bcfb9257c..333164d2810 100644
--- a/tests/wpt/meta/html/dom/reflection-misc.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-misc.html.ini
@@ -5092,3 +5092,75 @@
 
   [undefinedelement.inputMode: IDL set to "ſearch"]
     expected: FAIL
+
+  [html.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [html.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [script.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [script.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [noscript.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [noscript.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [template.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [template.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [slot.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [slot.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ins.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ins.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [del.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [del.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [details.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [details.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [summary.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [summary.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [menu.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [menu.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dialog.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dialog.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [undefinedelement.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [undefinedelement.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-obsolete.html.ini b/tests/wpt/meta/html/dom/reflection-obsolete.html.ini
index 5437fb58ec0..de7560aa572 100644
--- a/tests/wpt/meta/html/dom/reflection-obsolete.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-obsolete.html.ini
@@ -4054,3 +4054,129 @@
 
   [font.tabIndex: IDL set to -2147483648]
     expected: FAIL
+
+  [marquee.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.hspace: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.scrollAmount: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.scrollDelay: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "-"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "+"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [marquee.vspace: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frameset.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frameset.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [frame.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [frame.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dir.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dir.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [font.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [font.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-sections.html.ini b/tests/wpt/meta/html/dom/reflection-sections.html.ini
index 024728e6abe..f707a507012 100644
--- a/tests/wpt/meta/html/dom/reflection-sections.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-sections.html.ini
@@ -6160,3 +6160,93 @@
 
   [#document.alinkColor (<body alink>): IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [body.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [body.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [article.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [article.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [section.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [section.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [nav.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [nav.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [aside.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [aside.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h1.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h1.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h2.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h2.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h3.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h3.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h4.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h4.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h5.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h5.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [h6.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [h6.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [hgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [hgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [header.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [header.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [footer.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [footer.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [address.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [address.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-tabular.html.ini b/tests/wpt/meta/html/dom/reflection-tabular.html.ini
index dc1c444b6fb..5bf1b18d07e 100644
--- a/tests/wpt/meta/html/dom/reflection-tabular.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-tabular.html.ini
@@ -9976,3 +9976,111 @@
 
   [th.vAlign: IDL set to object "test-valueOf"]
     expected: FAIL
+
+  [table.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [table.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [caption.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [caption.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [colgroup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [colgroup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "-"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "+"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [colgroup.span: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [col.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [col.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "-"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "+"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\t\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\n\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\f\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "\\r\\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to " \\v7"]
+    expected: FAIL
+
+  [col.span: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tbody.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tbody.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [thead.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [thead.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [tfoot.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tfoot.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [tr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [tr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [td.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [td.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [th.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [th.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/reflection-text.html.ini b/tests/wpt/meta/html/dom/reflection-text.html.ini
index 99f628256d7..c7d4b796e28 100644
--- a/tests/wpt/meta/html/dom/reflection-text.html.ini
+++ b/tests/wpt/meta/html/dom/reflection-text.html.ini
@@ -10072,3 +10072,177 @@
 
   [wbr.tabIndex: IDL set to -2147483648]
     expected: FAIL
+
+  [a.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [a.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [em.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [em.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [strong.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [strong.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [small.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [small.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [s.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [s.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [cite.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [cite.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [q.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [q.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [dfn.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [dfn.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [abbr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [abbr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [ruby.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [ruby.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [rt.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [rt.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [rp.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [rp.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [data.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [data.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [time.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [time.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [code.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [code.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [var.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [var.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [samp.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [samp.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [kbd.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [kbd.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [sub.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [sub.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [sup.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [sup.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [i.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [i.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [b.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [b.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [u.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [u.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [mark.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [mark.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [bdi.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [bdi.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [bdo.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [bdo.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [span.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [span.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [br.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [br.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
+
+  [wbr.tabIndex: setAttribute() to "7\\v"]
+    expected: FAIL
+
+  [wbr.tabIndex: setAttribute() to object "3"]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini b/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
index 2ef0896e3b3..8b8af2b9c2e 100644
--- a/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
+++ b/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-window-initiator-is-not-opener.https.window.js.ini
@@ -1,4 +1,3 @@
 [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/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini
new file mode 100644
index 00000000000..72a5f3a733f
--- /dev/null
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/autofocus-area.html.ini
@@ -0,0 +1,3 @@
+[autofocus-area.html]
+  [autofocus works on area element]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
index 0143c8940ca..ddd65fdcec8 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/supported-elements.html.ini
@@ -1,16 +1,15 @@
 [supported-elements.html]
-  expected: TIMEOUT
   [Contenteditable element should support autofocus]
     expected: FAIL
 
   [Host element with delegatesFocus including no focusable descendants should be skipped]
-    expected: NOTRUN
+    expected: FAIL
 
   [Element with tabindex should support autofocus]
     expected: FAIL
 
   [Area element should support autofocus]
-    expected: NOTRUN
+    expected: FAIL
 
   [Host element with delegatesFocus should support autofocus]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini b/tests/wpt/meta/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini
new file mode 100644
index 00000000000..4b24a0c097e
--- /dev/null
+++ b/tests/wpt/meta/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html.ini
@@ -0,0 +1,6 @@
+[no-help-cursor-on-links-wrapped-in-svg.historical.html]
+  [Unvisited help links must have pointer cursor, not help cursor]
+    expected: FAIL
+
+  [Visited help links must have pointer cursor, not help cursor]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.html.ini
similarity index 90%
rename from tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.html.ini
index ee1082f2d16..68fa2bbd2c7 100644
--- a/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-input-number.tentative.html]
+[field-sizing-input-number.html]
   [number: Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.html.ini
similarity index 98%
rename from tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.html.ini
index 0b2f031b4a5..a1695393f0b 100644
--- a/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-input-text.tentative.html]
+[field-sizing-input-text.html]
   [text: Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-select.html.ini
similarity index 90%
rename from tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-select.html.ini
index 035ff8355e0..04312b75b80 100644
--- a/tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-select.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-select.tentative.html]
+[field-sizing-select.html]
   [dropdown: The width should depend on the selected OPTION]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.html.ini
similarity index 92%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.html.ini
index f596dfc1538..624106a6a82 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.html.ini
@@ -1,4 +1,4 @@
-[field-sizing-textarea.tentative.html]
+[field-sizing-textarea.html]
   [Empty value]
     expected: FAIL
 
diff --git a/tests/wpt/meta/html/rendering/widgets/input-text-size.html.ini b/tests/wpt/meta/html/rendering/widgets/input-text-size.html.ini
new file mode 100644
index 00000000000..841363fe1db
--- /dev/null
+++ b/tests/wpt/meta/html/rendering/widgets/input-text-size.html.ini
@@ -0,0 +1,3 @@
+[input-text-size.html]
+  [Size attribute value is not a presentational hint]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/textarea-cols-rows.html.ini b/tests/wpt/meta/html/rendering/widgets/textarea-cols-rows.html.ini
index 721bdd39ab0..38a19fff773 100644
--- a/tests/wpt/meta/html/rendering/widgets/textarea-cols-rows.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/textarea-cols-rows.html.ini
@@ -1,3 +1,9 @@
 [textarea-cols-rows.html]
   [Cols/rows attribute values affect computed style]
     expected: FAIL
+
+  [Cols/rows attribute values affect layout-dependent computed style]
+    expected: FAIL
+
+  [Cols/rows attribute values are not presentational hints]
+    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 f455bb20528..24903b5f66f 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
@@ -1,4 +1,4 @@
 [iframe_sandbox_popups_escaping-1.html]
-  expected: CRASH
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: FAIL
+    expected: TIMEOUT
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 841bafc6eca..26704422bbe 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
@@ -1,3 +1,4 @@
 [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: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
index bbc1f35d8d9..e8872b3585b 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html.ini
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_nonescaping-1.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
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 4034793cc72..c6f1e5d7d84 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
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_nonescaping-2.html]
+  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: FAIL
+    expected: NOTRUN
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
index d5fd800f09d..ff6467094b8 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_nonescaping-3.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe do not escape the sandbox]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/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
deleted file mode 100644
index 47b45e65a1c..00000000000
--- a/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-[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
new file mode 100644
index 00000000000..7682a4830bf
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
@@ -0,0 +1,4 @@
+[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/historical.html.ini b/tests/wpt/meta/html/semantics/forms/historical.html.ini
deleted file mode 100644
index 5d8289307cc..00000000000
--- a/tests/wpt/meta/html/semantics/forms/historical.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[historical.html]
-  [<input name=isindex> should not be supported]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini b/tests/wpt/meta/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini
new file mode 100644
index 00000000000..a11ccafd91d
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html.ini
@@ -0,0 +1,2 @@
+[select-child-button-and-datalist.tentative.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
index 7e889fccc46..9702f2ea949 100644
--- a/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
+++ b/tests/wpt/meta/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html.ini
@@ -1,2 +1,15 @@
 [dialog-focus-previous-outside.html]
-  expected: ERROR
+  [Focus should not be restored if the currently focused element is not inside the dialog.]
+    expected: FAIL
+
+  [Focus restore should not occur when the focused element is in a shadowroot outside of the dialog.]
+    expected: FAIL
+
+  [Focus restore should occur when the focused element is in a shadowroot inside the dialog.]
+    expected: FAIL
+
+  [Focus restore should occur when the focused element is slotted into a dialog.]
+    expected: FAIL
+
+  [Focus restore should always occur for modal dialogs.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/popovers/popover-shadowhost-focus.html.ini b/tests/wpt/meta/html/semantics/popovers/popover-shadowhost-focus.html.ini
index 4add6ce5673..84547016f9b 100644
--- a/tests/wpt/meta/html/semantics/popovers/popover-shadowhost-focus.html.ini
+++ b/tests/wpt/meta/html/semantics/popovers/popover-shadowhost-focus.html.ini
@@ -1,2 +1,12 @@
 [popover-shadowhost-focus.html]
-  expected: ERROR
+  [autofocus=true, delegatesfocus=false]
+    expected: FAIL
+
+  [autofocus=true, delegatesfocus=true]
+    expected: FAIL
+
+  [autofocus=false, delegatesfocus=false]
+    expected: FAIL
+
+  [autofocus=false, delegatesfocus=true]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/remove-initial-about-blankness.window.js.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/remove-initial-about-blankness.window.js.ini
index 2bfc617ce40..4d9d87b1a60 100644
--- a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/remove-initial-about-blankness.window.js.ini
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/remove-initial-about-blankness.window.js.ini
@@ -1,3 +1,4 @@
 [remove-initial-about-blankness.window.html]
+  expected: TIMEOUT
   [Double-check: without document.open(), Window reuse indeed happens]
-    expected: FAIL
+    expected: TIMEOUT
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 6206f8c0210..8244944df44 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
@@ -2,3 +2,6 @@
   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: TIMEOUT
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 86a2572b9b8..12581463c49 100644
--- a/tests/wpt/meta/resource-timing/test_resource_timing.html.ini
+++ b/tests/wpt/meta/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/selection/move-selection-range-into-different-root.tentative.html.ini b/tests/wpt/meta/selection/move-selection-range-into-different-root.tentative.html.ini
new file mode 100644
index 00000000000..13f845aa56e
--- /dev/null
+++ b/tests/wpt/meta/selection/move-selection-range-into-different-root.tentative.html.ini
@@ -0,0 +1,48 @@
+[move-selection-range-into-different-root.tentative.html]
+  [Set selection range into a document fragment with selectNode]
+    expected: FAIL
+
+  [Set selection range into a sub-document with selectNode]
+    expected: FAIL
+
+  [Set selection range into a document fragment with selectNodeContents]
+    expected: FAIL
+
+  [Set selection range into a sub-document with selectNodeContents]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEnd]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEnd]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEndAfter]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEndAfter]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setEndBefore]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setEndBefore]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStart]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStart]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStartAfter]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStartAfter]
+    expected: FAIL
+
+  [Set selection range into a document fragment with setStartBefore]
+    expected: FAIL
+
+  [Set selection range into a sub-document with setStartBefore]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webmessaging/without-ports/018.html.ini b/tests/wpt/meta/webmessaging/with-ports/018.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/webmessaging/without-ports/018.html.ini
rename to tests/wpt/meta/webmessaging/with-ports/018.html.ini
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 987e8a93681..36d21059338 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
@@ -1,4 +1,3 @@
 [import-in-moduleworker.html]
-  expected: ERROR
   [Base URL in module dedicated workers: import]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/workers/constructors/Worker/Worker-constructor.html.ini b/tests/wpt/meta/workers/constructors/Worker/Worker-constructor.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/workers/constructors/Worker/Worker-constructor.html.ini
rename to tests/wpt/meta/workers/constructors/Worker/Worker-constructor.html.ini
diff --git a/tests/wpt/mozilla/meta-legacy-layout/mozilla/service-workers/service-worker-registration.https.html.ini b/tests/wpt/mozilla/meta-legacy-layout/mozilla/service-workers/service-worker-registration.https.html.ini
index ee7cf8c2475..c7b4395d42b 100644
--- a/tests/wpt/mozilla/meta-legacy-layout/mozilla/service-workers/service-worker-registration.https.html.ini
+++ b/tests/wpt/mozilla/meta-legacy-layout/mozilla/service-workers/service-worker-registration.https.html.ini
@@ -1,5 +1,6 @@
 [service-worker-registration.https.html]
   type: testharness
+  expected: CRASH
   [Test: Asserts Active Service Worker and its Registration]
     expected: FAIL
 
diff --git a/tests/wpt/tests/accessibility/crashtests/remaining-invalid-objects.html b/tests/wpt/tests/accessibility/crashtests/remaining-invalid-objects.html
new file mode 100644
index 00000000000..fe117040665
--- /dev/null
+++ b/tests/wpt/tests/accessibility/crashtests/remaining-invalid-objects.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<body contenteditable=plaintext-only  style='column-count: 5; badrule: value; kheight: 98; cue: url("https://www.google.com/images/logo_sm.gif"); text-decoration-color: CanvasText; scroll-margin-top: 13px; '>
+<iframe></iframe>
+.c34:not(|p) { background-image: repeating-radial-gradient(farthest-side ellipse at 115% 102%, rgba(233, 101, 20, 0.554000), rgba(153, 114, 46, 0.275900)); overflow-y: auto; clip-path: ellipse(closest-side closest-side at top left); font-weigth: 220.04088707998096px; postion: relative; grid-row-end: span auto 18446744073709551589; counter-increment: ident9 8; cellspacing: -104; border-block-start-style: solid; stroke-dashoffset: 123%; renamed-property: Arial;  }<script>
+var docElement = document.body ? document.body : document.documentElement;
+docElement.contentEditable = "true";
+</script>
diff --git a/tests/wpt/tests/attribution-reporting/resources/helpers.js b/tests/wpt/tests/attribution-reporting/resources/helpers.js
index 488e3b33e3e..5778159d4c8 100644
--- a/tests/wpt/tests/attribution-reporting/resources/helpers.js
+++ b/tests/wpt/tests/attribution-reporting/resources/helpers.js
@@ -94,7 +94,6 @@ const getFetchParams = (origin, cookie) => {
   // https://fetch.spec.whatwg.org/#http-cors-protocol
 
   const allowOriginHeader = 'Access-Control-Allow-Origin';
-  const allowHeadersHeader = 'Access-Control-Allow-Headers';
 
   if (cookie) {
     credentials = 'include';
@@ -111,10 +110,6 @@ const getFetchParams = (origin, cookie) => {
       name: allowOriginHeader,
       value: '*',
     });
-    headers.push({
-      name: allowHeadersHeader,
-      value: '*',
-    })
   }
   return {credentials, headers};
 };
diff --git a/tests/wpt/tests/css/css-anchor-position/at-position-fallback-invalidation-shadow-dom.html b/tests/wpt/tests/css/css-anchor-position/at-position-fallback-invalidation-shadow-dom.html
index 162bfe940d4..066cba1dac7 100644
--- a/tests/wpt/tests/css/css-anchor-position/at-position-fallback-invalidation-shadow-dom.html
+++ b/tests/wpt/tests/css/css-anchor-position/at-position-fallback-invalidation-shadow-dom.html
@@ -3,7 +3,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <style>
   body { margin: 0; }
 </style>
@@ -22,10 +21,6 @@
 </div>
 
 <script>
-  setup(() => {
-    polyfill_declarative_shadow_dom(host);
-  });
-
   test(() => {
     assert_equals(host.offsetLeft, 0);
   }, "#host is initially left:auto");
diff --git a/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-computed.html b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-computed.html
new file mode 100644
index 00000000000..d6423c164b6
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-computed.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Anchor Positioning Test: Computed position-try-options</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-options">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<script src="/css/support/inheritance-testcommon.js"></script>
+<div id="container">
+  <div id="target"></div>
+</div>
+<script>
+  test_computed_value("position-try-options", "none");
+  test_computed_value("position-try-options", "flip-block");
+  test_computed_value("position-try-options", "flip-inline");
+  test_computed_value("position-try-options", "flip-start");
+  test_computed_value("position-try-options", "flip-block, flip-inline");
+  test_computed_value("position-try-options", "--foo, --bar");
+  test_computed_value("position-try-options", "flip-start flip-inline flip-block", "flip-block flip-inline flip-start");
+
+  assert_not_inherited("position-try-options", "none", "flip-inline");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-parsing.html b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-parsing.html
new file mode 100644
index 00000000000..dfc9997e9fd
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-options-parsing.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Anchor Positioning Test: Parsing of position-try-options</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-options">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<div id="target"></div>
+<script>
+  test_valid_value("position-try-options", "initial");
+  test_valid_value("position-try-options", "inherit");
+  test_valid_value("position-try-options", "unset");
+  test_valid_value("position-try-options", "revert");
+  test_valid_value("position-try-options", "none");
+  test_valid_value("position-try-options", "flip-block");
+  test_valid_value("position-try-options", "flip-start, flip-block");
+  test_valid_value("position-try-options", "flip-start flip-inline, flip-block");
+  test_valid_value("position-try-options", "flip-start, flip-start");
+  test_valid_value("position-try-options", "flip-block, --foo");
+  test_valid_value("position-try-options", "--bar, flip-block flip-start");
+  test_valid_value("position-try-options", "--foo, --bar, --baz");
+
+  test_invalid_value("position-try-options", "none, flip-start");
+  test_invalid_value("position-try-options", "flip-block flip-block");
+  test_invalid_value("position-try-options", "flip-block --foo");
+  test_invalid_value("position-try-options", "--foo --bar");
+  test_invalid_value("position-try-options", "-foo");
+  test_invalid_value("position-try-options", "foo");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-computed.html b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-computed.html
new file mode 100644
index 00000000000..aebec00aef9
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-computed.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Anchor Positioning Test: Computed position-try-order</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-order-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<script src="/css/support/inheritance-testcommon.js"></script>
+<div id="container">
+  <div id="target"></div>
+</div>
+<script>
+  test_computed_value("position-try-order", "normal");
+  test_computed_value("position-try-order", "most-width");
+  test_computed_value("position-try-order", "most-height");
+  test_computed_value("position-try-order", "most-block-size");
+  test_computed_value("position-try-order", "most-inline-size");
+
+  assert_not_inherited("position-try-order", "normal", "most-inline-size");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-parsing.html b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-parsing.html
new file mode 100644
index 00000000000..4b3b34287f1
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/parsing/position-try-order-parsing.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Anchor Positioning Test: Parsing of position-try-order</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#position-try-order-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<div id="target"></div>
+<script>
+  test_valid_value("position-try-order", "initial");
+  test_valid_value("position-try-order", "inherit");
+  test_valid_value("position-try-order", "unset");
+  test_valid_value("position-try-order", "revert");
+  test_valid_value("position-try-order", "normal");
+  test_valid_value("position-try-order", "most-width");
+  test_valid_value("position-try-order", "most-height");
+  test_valid_value("position-try-order", "most-block-size");
+  test_valid_value("position-try-order", "most-inline-size");
+
+  test_invalid_value("position-try-order", "normal most-inline-size");
+  test_invalid_value("position-try-order", "most-block-size most-inline-size");
+  test_invalid_value("position-try-order", "most-block-size, most-inline-size");
+</script>
diff --git a/tests/wpt/tests/css/css-anchor-position/position-fallback-tree-scoped.html b/tests/wpt/tests/css/css-anchor-position/position-fallback-tree-scoped.html
index 1d65b966d8f..2650a32f60a 100644
--- a/tests/wpt/tests/css/css-anchor-position/position-fallback-tree-scoped.html
+++ b/tests/wpt/tests/css/css-anchor-position/position-fallback-tree-scoped.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-scoping/#shadow-names">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <style>
   body { margin: 0; }
@@ -101,11 +100,6 @@
 
 
 <script>
-  setup(() => {
-    polyfill_declarative_shadow_dom(outer_host);
-    polyfill_declarative_shadow_dom(host_slotted_part);
-  });
-
   test(() => {
     assert_equals(doc_pf_doc.offsetLeft, 100);
   }, "Document position-fallback matches @position-fallback in document scope");
diff --git a/tests/wpt/tests/css/css-anchor-position/property-interpolations.html b/tests/wpt/tests/css/css-anchor-position/property-interpolations.html
new file mode 100644
index 00000000000..878f46375b7
--- /dev/null
+++ b/tests/wpt/tests/css/css-anchor-position/property-interpolations.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Anchor Positioning Test: Interpolation of anchor related properties</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+<body>
+<script>
+  test_no_interpolation({
+    property: 'anchor-name',
+    from: 'none',
+    to: '--foo',
+  });
+  test_no_interpolation({
+    property: 'anchor-name',
+    from: '--foo',
+    to: '--bar',
+  });
+
+  test_no_interpolation({
+    property: 'anchor-default',
+    from: 'implicit',
+    to: '--foo',
+  });
+  test_no_interpolation({
+    property: 'anchor-default',
+    from: '--foo',
+    to: '--bar',
+  });
+
+  test_no_interpolation({
+    property: 'inset-area',
+    from: 'none',
+    to: 'center',
+  });
+  test_no_interpolation({
+    property: 'inset-area',
+    from: 'left',
+    to: 'right',
+  });
+
+  test_no_interpolation({
+    property: 'position-try-options',
+    from: 'none',
+    to: '--foo',
+  });
+  test_no_interpolation({
+    property: 'position-try-options',
+    from: 'none',
+    to: 'flip-block',
+  });
+  test_no_interpolation({
+    property: 'position-try-options',
+    from: 'flip-inline',
+    to: 'flip-block',
+  });
+  test_no_interpolation({
+    property: 'position-try-options',
+    from: '--foo',
+    to: '--bar',
+  });
+  test_no_interpolation({
+    property: 'position-try-options',
+    from: '--foo',
+    to: 'flip-block',
+  });
+
+  test_no_interpolation({
+    property: 'position-try-order',
+    from: 'normal',
+    to: 'most-width',
+  });
+  test_no_interpolation({
+    property: 'position-try-order',
+    from: 'most-width',
+    to: 'most-height',
+  });
+
+  test_no_interpolation({
+    property: 'position-fallback-bounds',
+    from: 'normal',
+    to: '--foo',
+  });
+  test_no_interpolation({
+    property: 'position-fallback-bounds',
+    from: '--foo',
+    to: '--bar',
+  });
+</script>
diff --git a/tests/wpt/tests/css/css-animations/crashtests/add-pseudo-while-animating-001.html b/tests/wpt/tests/css/css-animations/crashtests/add-pseudo-while-animating-001.html
new file mode 100644
index 00000000000..dc815658c5b
--- /dev/null
+++ b/tests/wpt/tests/css/css-animations/crashtests/add-pseudo-while-animating-001.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html class="test-wait">
+<head>
+<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1267079">
+<style>
+
+@keyframes a {
+    0% {
+        border-radius: 1px;
+    }
+}
+
+div {
+    animation-name: a;
+    animation-duration: 3s;
+}
+
+</style>
+<script>
+
+function addSheet(text)
+{
+    var sheet = document.createElement("style");
+    sheet.appendChild(document.createTextNode(text));
+    document.head.appendChild(sheet);
+}
+
+function boom()
+{
+    requestAnimationFrame(() => { requestAnimationFrame(() => {
+        addSheet("div:after { content: 'Z'; }");
+        document.documentElement.classList.remove("test-wait");
+    }); });
+}
+
+window.addEventListener("load", boom, false);
+
+</script>
+</head>
+
+<body><div></div></body>
+</html>
diff --git a/tests/wpt/tests/css/css-backgrounds/background-position-negative-percentage-comparison-002.html b/tests/wpt/tests/css/css-backgrounds/background-position-negative-percentage-comparison-002.html
new file mode 100644
index 00000000000..b349617c58b
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/background-position-negative-percentage-comparison-002.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#background-position">
+<link rel="help" href="https://drafts.csswg.org/css-values-4/#comp-func">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1874606#c3">
+<link rel="match" href="reference/background-position-negative-percentage-comparison-ref.html">
+<style>
+.target {
+  margin: 50px;
+  width: 50px;
+  height: 50px;
+  border: 1px solid black;
+  background-image: url("support/100x100-blue-and-orange.png");
+  background-position: min(0%, 100%) max(0%, 100%);
+  /* Should behave the same as the declaration above: */
+  background-position-x: min(0%, 100%);
+  background-position-y: max(0%, 100%);
+}
+</style>
+<div class="target"></div>
diff --git a/tests/wpt/tests/css/css-cascade/scope-shadow.tentative.html b/tests/wpt/tests/css/css-cascade/scope-shadow.tentative.html
index 28fed27cee8..83a468bd07b 100644
--- a/tests/wpt/tests/css/css-cascade/scope-shadow.tentative.html
+++ b/tests/wpt/tests/css/css-cascade/scope-shadow.tentative.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9025">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <div id=host_plain>
   <template shadowrootmode=open>
@@ -21,7 +20,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(host_plain);
     let a = host_plain.shadowRoot.querySelector('.a');
     assert_equals(getComputedStyle(a).zIndex, '1');
   }, '@scope can match :host');
@@ -48,7 +46,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(host_functional);
     let a = host_functional.shadowRoot.querySelector('.a');
     assert_equals(getComputedStyle(a).zIndex, '1');
   }, '@scope can match :host(...)');
@@ -69,7 +66,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(host_scope_subject);
     assert_equals(getComputedStyle(host_scope_subject).zIndex, '1');
   }, ':scope matches host via the scoping root');
 </script>
@@ -98,7 +94,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(host_scope_subject_is);
     let host = host_scope_subject_is.querySelector('.host');
     assert_equals(getComputedStyle(host).zIndex, '1');
     let a = host.shadowRoot.querySelector('.a');
@@ -131,7 +126,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(implicit_scope_shadow_parent);
     let host = implicit_scope_shadow_parent.querySelector('.host');
     let a = host.shadowRoot.querySelector('.a');
     assert_equals(getComputedStyle(host).zIndex, '1');
@@ -150,7 +144,6 @@
 </div>
 <script>
   test(() => {
-    polyfill_declarative_shadow_dom(implicit_scope_constructed);
     let host = implicit_scope_constructed.querySelector('.host');
     let sheet = new CSSStyleSheet();
     sheet.replaceSync(`
diff --git a/tests/wpt/tests/css/css-cascade/scope-visited.html b/tests/wpt/tests/css/css-cascade/scope-visited.html
index afccb41a4f2..392aeb667b2 100644
--- a/tests/wpt/tests/css/css-cascade/scope-visited.html
+++ b/tests/wpt/tests/css/css-cascade/scope-visited.html
@@ -3,7 +3,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scoped-styles">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#link">
 <link rel="match" href="scope-visited-ref.html">
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <!-- Sub-tests use ShadowDOM to stay isolated from eachother. -->
 
@@ -205,8 +204,6 @@
 
 <script>
   window.onload = () => {
-    polyfill_declarative_shadow_dom(document);
-
     // Insert the inner :visited link with JS, since the parser
     // can't produce this.
     let outer_a = visited_in_visited.shadowRoot.querySelector('main > a');
@@ -215,4 +212,4 @@
     inner_a.textContent = 'Visited2';
     outer_a.append(inner_a);
   }
-</script>
\ No newline at end of file
+</script>
diff --git a/tests/wpt/tests/css/css-contain/container-queries/container-for-shadow-dom.html b/tests/wpt/tests/css/css-contain/container-queries/container-for-shadow-dom.html
index d1a0c3b5689..b136af902e5 100644
--- a/tests/wpt/tests/css/css-contain/container-queries/container-for-shadow-dom.html
+++ b/tests/wpt/tests/css/css-contain/container-queries/container-for-shadow-dom.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="support/cq-testcommon.js"></script>
 <style>
   #inclusive-ancestor-across-root,
@@ -275,7 +274,6 @@
 <script>
   setup(() => {
     assert_implements_container_queries();
-    polyfill_declarative_shadow_dom(document);
   });
 
   const green = "rgb(0, 128, 0)";
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 d6ccaad2b9c..e0890aab32d 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
@@ -5,7 +5,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-scoping-1/#shadow-names">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="support/cq-testcommon.js"></script>
 
 <div id="container-name-host">
@@ -67,12 +66,29 @@
       </template>
     </div>
   </div>
+
+  <div id="container-name-host-inner-slotted">
+    <div>
+      <template shadowrootmode="open">
+        <style>
+          :host { container-name: foo; }
+          ::slotted(div) { color: red; }
+          @container foo (width > 0px) {
+            ::slotted(div) {
+              color: green;
+            }
+          }
+        </style>
+        <slot></slot>
+      </template>
+      <div id="t4"></div>
+    </div>
+  </div>
 </div>
 
 <script>
   setup(() => {
     assert_implements_container_queries();
-    polyfill_declarative_shadow_dom(document);
   });
 
   const green = "rgb(0, 128, 0)";
@@ -89,4 +105,8 @@
     assert_equals(getComputedStyle(t3host.shadowRoot.querySelector('#t3')).color, green);
   }, "Inner scope query should match container-name set by :host rule in shadow tree");
 
+  test(() => {
+    assert_equals(getComputedStyle(t4).color, green);
+  }, "Inner scope query containing ::slotted should match container-name set by :host rule in shadow tree");
+
 </script>
diff --git a/tests/wpt/tests/css/css-contain/container-queries/container-size-shadow-invalidation.html b/tests/wpt/tests/css/css-contain/container-queries/container-size-shadow-invalidation.html
index 35773b3006a..b2e02a10916 100644
--- a/tests/wpt/tests/css/css-contain/container-queries/container-size-shadow-invalidation.html
+++ b/tests/wpt/tests/css/css-contain/container-queries/container-size-shadow-invalidation.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="support/cq-testcommon.js"></script>
 <style>
   .container {
@@ -36,7 +35,6 @@
 <script>
   setup(() => {
     assert_implements_container_queries();
-    polyfill_declarative_shadow_dom(document);
   });
 
   const green = "rgb(0, 128, 0)";
diff --git a/tests/wpt/tests/css/css-contain/container-queries/container-units-shadow.html b/tests/wpt/tests/css/css-contain/container-queries/container-units-shadow.html
index c7fd0500f25..0e4172c90ee 100644
--- a/tests/wpt/tests/css/css-contain/container-queries/container-units-shadow.html
+++ b/tests/wpt/tests/css/css-contain/container-queries/container-units-shadow.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-queries">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="support/cq-testcommon.js"></script>
 <style>
   #outer {
@@ -48,7 +47,6 @@
 <script>
   setup(() => {
     assert_implements_container_queries();
-    polyfill_declarative_shadow_dom(document);
   });
 
   test(() => {
diff --git a/tests/wpt/tests/css/css-contain/container-queries/crashtests/mathml-container-type-crash.html b/tests/wpt/tests/css/css-contain/container-queries/crashtests/mathml-container-type-crash.html
new file mode 100644
index 00000000000..538c1b54451
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/container-queries/crashtests/mathml-container-type-crash.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>container-type invalidation crash test</title>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1878188">
+<math>
+  <malignmark id="target" style="container-type: size"/>
+</math>
+<script>
+  onload = () => target.style.containerType = "inline-size"
+</script>
diff --git a/tests/wpt/tests/css/css-contain/container-queries/style-container-for-shadow-dom.html b/tests/wpt/tests/css/css-contain/container-queries/style-container-for-shadow-dom.html
index b8bea097504..d88bf0bca98 100644
--- a/tests/wpt/tests/css/css-contain/container-queries/style-container-for-shadow-dom.html
+++ b/tests/wpt/tests/css/css-contain/container-queries/style-container-for-shadow-dom.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="support/cq-testcommon.js"></script>
 
 <div id="inclusive-ancestor-across-root">
@@ -195,7 +194,6 @@
 <script>
   setup(() => {
     assert_implements_container_queries();
-    polyfill_declarative_shadow_dom(document);
   });
 
   const green = "rgb(0, 128, 0)";
diff --git a/tests/wpt/tests/css/css-grid/grid-table-cell-001-crash.html b/tests/wpt/tests/css/css-grid/grid-table-cell-001-crash.html
new file mode 100644
index 00000000000..7b9c09e3af7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/grid-table-cell-001-crash.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1232875">
+<script>
+
+function boom()
+{
+    document.documentElement.offsetHeight;
+    document.getElementsByTagName("table")[0].style.inlineSize = "1px";
+    document.documentElement.offsetHeight;
+    document.getElementsByTagName("td")[0].style.display = "inline-grid";
+    document.documentElement.offsetHeight;
+}
+
+</script>
+</head>
+
+<body onload="boom();">
+
+<table style="writing-mode: vertical-rl; table-layout: fixed;">
+    <caption style="float: inline-end;">A B</caption>
+    <tbody><tr><td></td></tr></tbody>
+</table>
+
+<div style="height: 3000px;"></div>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002-ref.html b/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002-ref.html
new file mode 100644
index 00000000000..5e2f1cbac32
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002-ref.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Reference: Specified alignment properties in subgridded axes</title>
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-2/#subgrid-box-alignment">
+<style>
+div {
+  display: inline-grid;
+  gap: 5px;
+}
+
+.grid { grid-template: 50px / 50px }
+.vlr { writing-mode: vertical-lr }
+.subgrid { background: gray }
+
+.item {
+  background: orange;
+  height: 20px;
+  width: 20px;
+}
+
+.as { align-self: start }
+.ae { align-self: end }
+.ac { align-self: center }
+.ab { align-self: baseline }
+
+.js { justify-self: start }
+.je { justify-self: end }
+.jc { justify-self: center }
+.jb { justify-self: baseline }
+</style>
+<div id="wrapper"></div>
+
+<template id="grid">
+  <div class="grid">
+    <div class="subgrid">
+      <div class="item"></div>
+    </div>
+  </div>
+</template>
+
+<script>
+"use strict";
+
+let align_properties = ["as", "ae", "ac", "ab"];
+let justify_properties = ["js", "je", "jc", "jb"];
+let wrapper = document.getElementById("wrapper");
+
+wrapper.style.gridTemplateColumns = `repeat(${justify_properties.length * 2}, 50px)`;
+
+for (let align_self of align_properties) {
+  // Add a grid for all combinations of `align-self` and `justify-self`.
+  for (let justify_self of justify_properties) {
+    let grid = document.getElementById("grid").content.cloneNode(true);
+    grid.querySelector(".item").classList.add(align_self, justify_self);
+    wrapper.appendChild(grid);
+  }
+
+  // Add all combinations again, but make the subgrid orthogonal.
+  for (let justify_self of justify_properties) {
+    let grid = document.getElementById("grid").content.cloneNode(true);
+    grid.querySelector(".item").classList.add(align_self, justify_self);
+    grid.querySelector(".subgrid").classList.add("vlr");
+    wrapper.appendChild(grid);
+  }
+}
+</script>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002.html b/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002.html
new file mode 100644
index 00000000000..68f1b3d43c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/subgrid/alignment-in-subgridded-axes-002.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Test: Specified alignment properties in subgridded axes</title>
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-2/#subgrid-box-alignment">
+<link rel="match" href="alignment-in-subgridded-axes-002-ref.html">
+<style>
+div {
+  display: inline-grid;
+  gap: 5px;
+}
+
+.grid { grid-template: 50px / 50px }
+.vlr { writing-mode: vertical-lr }
+
+.subgrid {
+  background: gray;
+  grid-template: subgrid / subgrid;
+}
+
+.item {
+  background: orange;
+  height: 20px;
+  width: 20px;
+}
+
+.as { align-self: start }
+.ae { align-self: end }
+.ac { align-self: center }
+.ab { align-self: baseline }
+
+.js { justify-self: start }
+.je { justify-self: end }
+.jc { justify-self: center }
+.jb { justify-self: baseline }
+</style>
+<div id="wrapper"></div>
+
+<template id="grid">
+  <div class="grid">
+    <div class="subgrid">
+      <div class="item"></div>
+    </div>
+  </div>
+</template>
+
+<script>
+"use strict";
+
+let align_properties = ["as", "ae", "ac", "ab"];
+let justify_properties = ["js", "je", "jc", "jb"];
+let wrapper = document.getElementById("wrapper");
+
+wrapper.style.gridTemplateColumns = `repeat(${justify_properties.length * 2}, 50px)`;
+
+for (let align_self of align_properties) {
+  // Add a grid for all combinations of `align-self` and `justify-self`.
+  for (let justify_self of justify_properties) {
+    let grid = document.getElementById("grid").content.cloneNode(true);
+    grid.querySelector(".item").classList.add(align_self, justify_self);
+    wrapper.appendChild(grid);
+  }
+
+  // Add all combinations again, but make the subgrid orthogonal.
+  for (let justify_self of justify_properties) {
+    let grid = document.getElementById("grid").content.cloneNode(true);
+    grid.querySelector(".item").classList.add(align_self, justify_self);
+    grid.querySelector(".subgrid").classList.add("vlr");
+    wrapper.appendChild(grid);
+  }
+}
+</script>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/subgrid-baseline-012.html b/tests/wpt/tests/css/css-grid/subgrid/subgrid-baseline-012.html
new file mode 100644
index 00000000000..e6348411f5f
--- /dev/null
+++ b/tests/wpt/tests/css/css-grid/subgrid/subgrid-baseline-012.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Test: Baseline-aligned subgridded item</title>
+<link rel="author" title="Ethan Jimenez" href="mailto:ethavar@microsoft.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-2/#subgrid-box-alignment">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<style>
+.grid {
+  display: inline-grid;
+  background: red;
+}
+.subgrid {
+  display: grid;
+  grid-template-rows: subgrid;
+  writing-mode: vertical-rl;
+}
+.item {
+  align-self: baseline;
+  background: green;
+  height: 100px;
+  width: 100px;
+}
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="grid">
+  <div class="subgrid">
+    <div class="item"></div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-overflow/ellipsis-with-image-crash.html b/tests/wpt/tests/css/css-overflow/ellipsis-with-image-crash.html
new file mode 100644
index 00000000000..42a18d0eb0e
--- /dev/null
+++ b/tests/wpt/tests/css/css-overflow/ellipsis-with-image-crash.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/issues/41493875">
+<style>
+  #ellipsis {
+    overflow: clip;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    width: 18ch;
+  }
+  img {
+    width: 10ch;
+  }
+  .ib {
+    display: inline-block;
+    width: 10ch;
+    height: 10px;
+  }
+</style>
+<div id="ellipsis">
+  <span style="border-top:1px solid;">
+    x<br>
+    <img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="><div class="ib"></div>
+  </span>
+</div>
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-001-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-001-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-001-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-001-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-001-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-001-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-001-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-001-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-002-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-002-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-002-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-002-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-002-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-002-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-002-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-002-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-003-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-003-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-003-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-004-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-004-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-004-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-004-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-005-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-005-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-005-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-005-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-006-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-006-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-006-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-006-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-007-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-007-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-007-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-007-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-008-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-008-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-008-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-008-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-009-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-009-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-009-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-009-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-010-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-010-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-010-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-010-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-011-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-011-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-011-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-012-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-012-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-012-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-012-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-012-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-012-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-012-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-012-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-013-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-013-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-013-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-013-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-013-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-013-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-014-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-014-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-014-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-014-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-014-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-014-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-015-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-015-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-015-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-015-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-015-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-015-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-015-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-015-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-016-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-016-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-016-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-016-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-016-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-016-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-016-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-017-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-017-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-017-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-017-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-017-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-017-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-017-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-018-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-018-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-018-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-018-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-018-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-018-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-018-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-019-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-019-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-019-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-019-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-019-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-019-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-020-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-020-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-020-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-020-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-020-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-020-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-020-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-021-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-021-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-021-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-021-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-021-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-021-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-021-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-022-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-022-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-022-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-022-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-022-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-022-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-022-print.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-023-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-023-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-023-print-ref.html
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diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-023-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-023-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-023-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-023-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-024-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-024-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-024-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-024-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-024-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-024-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-024-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-024-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-025-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-025-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-025-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-025-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-025-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-025-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-025-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-025-print.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-026-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-026-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-026-print-ref.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-026-print-ref.html
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-026-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-026-print.html
similarity index 100%
rename from tests/wpt/tests/css/printing/monolithic-overflow-026-print.html
rename to tests/wpt/tests/css/css-page/monolithic-overflow-026-print.html
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-027-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-027-print-ref.html
new file mode 100644
index 00000000000..560f137bf52
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-027-print-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="height:400vh; background:green;">
+  There should be four green pages.
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-027-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-027-print.html
new file mode 100644
index 00000000000..c7cfd37e2e8
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-027-print.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/41496759">
+<link rel="match" href="monolithic-overflow-027-print-ref.html">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="position:absolute; width:100%; contain:size; height:4in; background:red;">
+  <div style="height:8in; background:green;">
+    There should be four green pages.
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-028-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-028-print-ref.html
new file mode 100644
index 00000000000..560f137bf52
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-028-print-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="height:400vh; background:green;">
+  There should be four green pages.
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-028-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-028-print.html
new file mode 100644
index 00000000000..c549db6410d
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-028-print.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/41496759">
+<link rel="match" href="monolithic-overflow-028-print-ref.html">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="position:absolute; overflow-y:clip; width:100%; contain:size; height:8in; background:red;">
+  <div style="height:23in; background:green;">
+    There should be four green pages.
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-029-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-029-print-ref.html
new file mode 100644
index 00000000000..560f137bf52
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-029-print-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="height:400vh; background:green;">
+  There should be four green pages.
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-029-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-029-print.html
new file mode 100644
index 00000000000..c869d87d683
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-029-print.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/41496759">
+<link rel="match" href="monolithic-overflow-029-print-ref.html">
+<style>
+  body {
+    color: white;
+    margin: 0;
+  }
+</style>
+<div style="position:absolute; width:100%; contain:size; height:4in; background:green;">
+  There should be four green pages.
+</div>
+<div style="position:absolute; width:100%; top:2in; contain:size; height:2in; background:red;">
+  <div style="height:6in; background:green;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-030-print-ref.html b/tests/wpt/tests/css/css-page/monolithic-overflow-030-print-ref.html
new file mode 100644
index 00000000000..d8468e3b14d
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-030-print-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  body {
+    margin: 0;
+  }
+</style>
+<div style="break-after:page;">
+  <div style="display:flow-root; height:1.5in;">
+    <p>
+      There should be four pages, and each one should have a green square in the
+      bottom right corner.
+    </p>
+  </div>
+  <div style="margin-left:auto; width:0.5in; height:0.5in; background:green;"></div>
+</div>
+<div style="break-after:page;">
+  <div style="height:1.5in;"></div>
+  <div style="margin-left:auto; width:0.5in; height:0.5in; background:green;"></div>
+</div>
+<div style="break-after:page;">
+  <div style="height:1.5in;"></div>
+  <div style="margin-left:auto; width:0.5in; height:0.5in; background:green;"></div>
+</div>
+<div style="break-after:page;">
+  <div style="height:1.5in;"></div>
+  <div style="margin-left:auto; width:0.5in; height:0.5in; background:green;"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-page/monolithic-overflow-030-print.html b/tests/wpt/tests/css/css-page/monolithic-overflow-030-print.html
new file mode 100644
index 00000000000..e36f25434df
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/monolithic-overflow-030-print.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://issues.chromium.org/41496759">
+<link rel="match" href="monolithic-overflow-030-print-ref.html">
+<style>
+  body {
+    margin: 0;
+  }
+</style>
+<p>
+  There should be four pages, and each one should have a green square in the
+  bottom right corner.
+</p>
+<div style="position:absolute; top:0; width:100%; contain:size; height:8in;"></div>
+<div style="position:fixed; right:0; bottom:0; width:0.5in; height:0.5in; background:green;"></div>
diff --git a/tests/wpt/tests/css/printing/reference/monolithic-overflow-4-pages-print-ref.html b/tests/wpt/tests/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html
similarity index 100%
rename from tests/wpt/tests/css/printing/reference/monolithic-overflow-4-pages-print-ref.html
rename to tests/wpt/tests/css/css-page/reference/monolithic-overflow-4-pages-print-ref.html
diff --git a/tests/wpt/tests/css/css-page/trailing-declaration-crash.html b/tests/wpt/tests/css/css-page/trailing-declaration-crash.html
new file mode 100644
index 00000000000..54b9a132201
--- /dev/null
+++ b/tests/wpt/tests/css/css-page/trailing-declaration-crash.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<title>CSS Page: Crash with trailing declarations</title>
+<style>
+  @page {
+    @top-center {}
+    size: 500px;
+  }
+</style>
diff --git a/tests/wpt/tests/css/css-position/backdrop-tree-abiding-slotted.html b/tests/wpt/tests/css/css-position/backdrop-tree-abiding-slotted.html
index 55db27a80e0..057b484e262 100644
--- a/tests/wpt/tests/css/css-position/backdrop-tree-abiding-slotted.html
+++ b/tests/wpt/tests/css/css-position/backdrop-tree-abiding-slotted.html
@@ -6,7 +6,6 @@
 <link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <div>
   <template shadowrootmode="open">
     <style>
diff --git a/tests/wpt/tests/css/css-position/overlay/overlay-transition-property.html b/tests/wpt/tests/css/css-position/overlay/overlay-transition-property.html
index a667f26ea6a..dddb0c89e16 100644
--- a/tests/wpt/tests/css/css-position/overlay/overlay-transition-property.html
+++ b/tests/wpt/tests/css/css-position/overlay/overlay-transition-property.html
@@ -8,8 +8,8 @@
 <div id="target"></div>
 <script>
   test_valid_value("transition-property", "overlay");
-  test_valid_value("transition", "overlay 2s", "overlay 2s ease 0s");
+  test_valid_value("transition", "overlay 2s");
 
   test_computed_value("transition-property", "overlay");
-  test_computed_value("transition", "overlay 1s", "overlay 1s ease 0s");
+  test_computed_value("transition", "overlay 1s");
 </script>
diff --git a/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-element.html b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-element.html
new file mode 100644
index 00000000000..f15a291f08a
--- /dev/null
+++ b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-element.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <link rel="help" href="https://drafts.csswg.org/css-scroll-snap" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/dom/events/scrolling/scroll_support.js"></script>
+    <script src="/resources/testdriver.js"></script>
+    <script src="/resources/testdriver-actions.js"></script>
+    <script src="/resources/testdriver-vendor.js"></script>
+    <script src="resources/common.js" ></script>
+  </head>
+  <body>
+    <style>
+      .scroller {
+        overflow: scroll;
+        position: relative;
+        height: 400px;
+        width: 400px;
+        border:solid 1px black;
+        scroll-snap-type: y mandatory;
+      }
+      .no-snap { scroll-snap-align: none }
+      .scroller div:focus {
+        border: solid 1px red;
+      }
+      .large-space {
+        height: 300vh;
+        width: 300vw;
+      }
+      .target {
+        scroll-snap-align: start;
+        position: absolute;
+        width: 100px;
+        height: 100px;
+        border: solid 1px black;
+      }
+      .top {
+        top: 0px;
+      }
+      .left {
+        left: 0px;
+      }
+      .right {
+        left: 200px;
+      }
+      .bottom {
+        top: 200px;
+      }
+      </style>
+    <div id="scroller" class="scroller">
+      <div class="large-space no-snap" tabindex="1" id="space"></div>
+      <div id="topleft" tabindex="1" class="top left target">top left</div>
+      <div id="topright" tabindex="1" class="top right target">top right</div>
+      <div id="bottomleft" tabindex="1" class="bottom left target">bottom left</div>
+      <div id="bottomright" tabindex="1" class="bottom right target">bottom right</div>
+    </div>
+    <script>
+      window.onload = () => {
+        const bottomright = document.getElementById("bottomright");
+        const bottomleft = document.getElementById("bottomleft");
+        const scroller = document.getElementById("scroller");
+
+        async function commonInitialization() {
+          await waitForCompositorCommit();
+          assert_equals(scroller.scrollTop, 0, "snapped to top row");
+        }
+
+        promise_test(async (t) => {
+          await commonInitialization();
+
+          focusAndAssert(bottomright);
+          await runScrollSnapSelectionVerificationTest(t, scroller,
+                                                       [bottomright,
+                                                        bottomleft],
+                                    /*expected_target=*/bottomright, "y");
+
+          focusAndAssert(bottomleft);
+          await runScrollSnapSelectionVerificationTest(t, scroller,
+                                                       [bottomright,
+                                                        bottomleft],
+                                    /*expected_target=*/bottomleft, "y");
+        }, "scroller selects focused target from aligned choices on snap");
+
+        promise_test(async (t) => {
+          t.add_cleanup(() => {
+            bottomright.style.left = "200px";
+          })
+          await commonInitialization();
+
+          // Move bottomright out of the snapport.
+          bottomright.style.left = "500px";
+
+          // Set focus on bottomright without scrolling to it.
+          focusAndAssert(bottomright, true);
+          await runScrollSnapSelectionVerificationTest(t, scroller,
+                                                       [bottomright,
+                                                        bottomleft],
+                                    /*expected_target=*/bottomleft, "y");
+        }, "out-of-viewport focused element is not the selected snap target.");
+
+        promise_test(async(t) => {
+          t.add_cleanup(() => {
+            bottomleft.style.top = "200px";
+          });
+          await commonInitialization();
+
+          // Set focus on bottomright without scrolling to it.
+          focusAndAssert(bottomright, true);
+
+          // Move bottomleft below bottomright.
+          bottomleft.style.top = "400px";
+
+          // Snap to bottomleft.
+          scroller.scrollTop = bottomleft.offsetTop;
+
+          // Test that if bottomright is also shifted so that it is aligned with
+          // bottomleft, bottomleft remains the selected snap target, despite
+          // bottomright's having focus.
+          await runLayoutSnapSeletionVerificationTest(t, scroller, [bottomright],
+                                                bottomleft, "y");
+        }, "scroller follows selected snap target through layout shift," +
+           "regardless of focus");
+
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-nested-containers.html b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-nested-containers.html
new file mode 100644
index 00000000000..a6a087316fd
--- /dev/null
+++ b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-focused-nested-containers.html
@@ -0,0 +1,109 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <link rel="help" href="https://drafts.csswg.org/css-scroll-snap" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/dom/events/scrolling/scroll_support.js"></script>
+    <script src="/resources/testdriver.js"></script>
+    <script src="/resources/testdriver-actions.js"></script>
+    <script src="/resources/testdriver-vendor.js"></script>
+    <script src="resources/common.js" ></script>
+  </head>
+  <body>
+    <style>
+      .snap {
+        scroll-snap-align: start;
+      }
+      .placeholder {
+        height: 40%;
+        width: 40%;
+        position: absolute;
+        top: 0px;
+        border: solid 1px black;
+      }
+      .right {
+        left: 50%;
+      }
+      .container {
+        position: relative;
+        border: solid 1px blue;
+        overflow: scroll;
+        scroll-snap-type: y mandatory;
+      }
+      .bigcontainer {
+        height: 1000px;
+        width: 1000px;
+      }
+      .smallcontainer {
+        height: 400px;
+        width: 400px;
+        position: absolute;
+        border: solid 1px blue;
+        top: 500px;
+        overflow: scroll;
+        scroll-snap-type: y mandatory;
+      }
+      .large-space {
+        height: 300vh;
+        width: 300vw;
+        position: absolute;
+      }
+      .target {
+        top: 50%;
+        width: 40%;
+        height: 40%;
+        position: absolute;
+        border: solid 1px red;
+      }
+      .target:focus {
+        border:solid 2px green;
+      }
+    </style>
+    <div class="bigcontainer container" id="outercontainer">
+      <div class="large-space"></div>
+      <div id="leftplaceholder" class="snap placeholder">LPH (outer)</div>
+      <div id="rightplaceholder" class="snap placeholder right">RPH (outer)</div>
+      <div id="leftcontainer" class="snap smallcontainer">
+        <div class="large-space"></div>
+        <div class="snap placeholder"></div>
+        <div class="snap placeholder right"></div>
+        <div id="lefttarget1" tabindex="1" class="snap target"></div>
+        <div id="lefttarget2" tabindex="1" class="snap target right"></div>
+      </div>
+      <div id="rightcontainer" class="snap smallcontainer right">
+        <div class="large-space"></div>
+        <div class="snap placeholder"></div>
+        <div class="snap placeholder right"></div>
+        <div id="righttarget1" tabindex="1" class="snap target"></div>
+        <div id="righttarget2" tabindex="1" class="snap target right"></div>
+      </div>
+    </div>
+    <script>
+      // This test verifies that a snap container (outer) which contains another
+      // snap container (inner) snaps with awareness of focus on children of the
+      // inner container, i.e. outer should prefer to select the snap area whose
+      // child has focus even if there is an intermediate snap container between
+      // the child and outer.
+      window.onload = () => {
+        const lefttarget1 = document.getElementById("lefttarget1");
+        const righttarget1 = document.getElementById("righttarget1");
+        const leftcontainer = document.getElementById("leftcontainer");
+        const rightcontainer = document.getElementById("rightcontainer");
+        const outercontainer = document.getElementById("outercontainer");
+
+        promise_test(async (t) => {
+          await waitForCompositorCommit();
+
+          focusAndAssert(lefttarget1, /*preventScroll=*/true);
+          await runScrollSnapSelectionVerificationTest(t, outercontainer,
+              [leftcontainer, rightcontainer], leftcontainer, "y");
+
+          focusAndAssert(righttarget1, /*preventScroll=*/true);
+          await runScrollSnapSelectionVerificationTest(t, outercontainer,
+              [leftcontainer, rightcontainer], rightcontainer, "y");
+        }, "Snap container prefers focused nested snap target.");
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/resources/common.js b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/resources/common.js
new file mode 100644
index 00000000000..6ceec9118c5
--- /dev/null
+++ b/tests/wpt/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/resources/common.js
@@ -0,0 +1,148 @@
+// Utility functions for scroll snap tests which verify User-Agents' snap point
+// selection logic when multiple snap targets are aligned.
+// It depends on methods in /resources/testdriver-actions.js and
+// /dom/event/scrolling/scroll_support.js so html files using these functions
+// should include those files as <script>s.
+
+// This function should be used by scroll snap WPTs wanting to test snap target
+// selection when scrolling to multiple aligned targets.
+// It assumes scroll-snap-align: start alignment and tries to align to the list
+// of snap targets provided, |elements|, which are all expected to be at the
+// same offset.
+async function scrollToAlignedElementsInAxis(scroller, elements, axis) {
+  let target_offset_y = null;
+  let target_offset_x = null;
+  if (axis == "y") {
+    for (const e of elements) {
+      if (target_offset_y) {
+        assert_equals(e.offsetTop, target_offset_y,
+          `${e.id} is at y offset ${target_offset_y}`);
+      } else {
+        target_offset_y = e.offsetTop;
+      }
+    }
+    assert_equals();
+  } else {
+    for (const e of elements) {
+      if (target_offset_x) {
+        assert_equals(e.offsetLeft, target_offset_x,
+          `${e.id} is at x offset ${target_offset_x}`);
+      } else {
+        target_offset_x = e.offsetLeft;
+      }
+    }
+  }
+  assert_not_equals(target_offset_x || target_offset_y, null);
+
+  const scrollend_promise = waitForScrollendEventNoTimeout(scroller);
+  await new test_driver.Actions().scroll(0, 0,
+    (target_offset_x || 0) - scroller.scrollLeft,
+    (target_offset_y || 0) - scroller.scrollTop,
+    { origin: scroller })
+    .send();
+  await scrollend_promise;
+  if (axis == "y") {
+    assert_equals(scroller.scrollTop, target_offset_y, "vertical scroll done");
+  } else {
+    assert_equals(scroller.scrollLeft,target_offset_x, "horizontal scroll done");
+  }
+}
+
+// This function verifies the snap target that a scroller picked by triggerring
+// a layout change and observing which target is followed. Tests using this
+// method should ensure that there is at least 100px of room to scroll in the
+// desired axis.
+// It assumes scroll-snap-align: start alignment.
+function verifySelectedSnapTarget(scroller, expected_snap_target, axis) {
+  // Save initial style.
+  const initial_left = getComputedStyle(expected_snap_target).left;
+  const initial_top = getComputedStyle(expected_snap_target).top;
+  if (axis == "y") {
+    // Move the expected snap target along the y axis.
+    const initial_scroll_top = scroller.scrollTop;
+    const target_top = expected_snap_target.offsetTop + 100;
+    expected_snap_target.style.top = `${target_top}px`;
+    assert_equals(scroller.scrollTop, expected_snap_target.offsetTop,
+      `scroller followed ${expected_snap_target.id} after layout change`);
+    assert_not_equals(scroller.scrollTop, initial_scroll_top,
+      "scroller actually scrolled in y axis");
+  } else {
+    // Move the expected snap target along the y axis.
+    const initial_scroll_left = scroller.scrollLeft;
+    const target_left = expected_snap_target.offsetLeft + 100;
+    expected_snap_target.style.left = `${target_left}px`;
+    assert_equals(scroller.scrollLeft, expected_snap_target.offsetLeft,
+      `scroller followed ${expected_snap_target.id} after layout change`);
+    assert_not_equals(scroller.scrollLeft, initial_scroll_left,
+      "scroller actually scrolled in x axis");
+  }
+  // Undo style changes.
+  expected_snap_target.style.top = initial_top;
+  expected_snap_target.style.left = initial_left;
+}
+
+// This is a utility function for tests which verify that the correct element
+// is snapped to when snapping at the end of a scroll.
+async function runScrollSnapSelectionVerificationTest(t, scroller, aligned_elements,
+                                                expected_target, axis) {
+  // Save initial scroll offset.
+  const initial_scroll_left = scroller.scrollLeft;
+  const initial_scroll_top = scroller.scrollTop;
+  await scrollToAlignedElementsInAxis(scroller, aligned_elements, axis);
+  verifySelectedSnapTarget(scroller, expected_target, axis);
+  // Restore initial scroll offsets.
+  const scrollend_promise = new Promise((resolve) => {
+    scroller.addEventListener("scrollend", resolve);
+  });
+  scroller.scrollTo(initial_scroll_left, initial_scroll_top);
+  await scrollend_promise;
+}
+
+// This is a utility function for tests verifying that a layout shift does not
+// cause a scroller to change its selected snap target.
+// It assumes the element to be aligned have scroll-snap-align: start.
+// It tries to align the list of snap targets provided, |elements| with the
+// current snap target.
+function shiftLayoutToAlignElements(elements, target, axis) {
+  for (let element of elements) {
+    if (axis == "y") {
+      element.style.top = `${target.offsetTop}px`;
+    } else {
+      element.style.left = `${target.offsetLeft}px`;
+    }
+  }
+}
+
+// This is a utility function for tests verifying that a layout shift does not
+// cause a scroller to change its selected snap target.
+// It assumes scroll-snap-align: start alignment.
+async function runLayoutSnapSeletionVerificationTest(t, scroller, elements_to_align,
+  expected_target, axis) {
+  // Save initial scroll offsets and position.
+  const initial_scroll_left = scroller.scrollLeft;
+  const initial_scroll_top = scroller.scrollTop;
+  let initial_tops = [];
+  for (const element of elements_to_align) {
+    initial_tops.push(getComputedStyle(element).top);
+  }
+
+  shiftLayoutToAlignElements(elements_to_align, expected_target, axis);
+  verifySelectedSnapTarget(scroller, expected_target, axis);
+
+  // Restore initial scroll offset and position states.
+  let num_elements = initial_tops.length;
+  for (let i = 0; i < num_elements; i++) {
+    elements_to_align[i].style.top = initial_tops[i];
+  }
+  // Restore initial scroll offsets.
+  const scrollend_promise = new Promise((resolve) => {
+    scroller.addEventListener("scrollend", resolve);
+  });
+  scroller.scrollTo(initial_scroll_left, initial_scroll_top);
+  await scrollend_promise;
+}
+
+function focusAndAssert(element, preventScroll=false) {
+  element.focus({preventScroll: preventScroll});
+  assert_equals(document.activeElement, element);
+}
diff --git a/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-001.html b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-001.html
index b8bcbe17b73..570f22de7be 100644
--- a/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-001.html
+++ b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-001.html
@@ -7,8 +7,13 @@
 <meta name="assert" content="Space before a line break is removed even if reordered to the middle of line by bidi reordering">
 
 <style>
+@font-face {
+    font-family: "Hasubi Mono";
+    src: url("/fonts/hasubi-mono/HasubiMono-Regular.woff2");
+}
+
 div {
-    font-family: monospace;
+    font-family: "Hasubi Mono", monospace;
     border: solid blue;
     font-size: 1.5em;
 }
@@ -16,9 +21,9 @@ div {
     border-color: orange;
     white-space: pre;
 }
-.w5 { width: 5ch; }
-.w6 { width: 6ch; }
-.w7 { width: 7ch; }
+.w5 { width: 5.01ch; } /* .01 to cover floating point errors */
+.w6 { width: 6.01ch; }
+.w7 { width: 7.01ch; }
 
 .blue { background: #aaaaff; }
 .red { background: #ffaaaa; }
diff --git a/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-002.html b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-002.html
index 0efba0a363f..47a1952832f 100644
--- a/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-002.html
+++ b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-002.html
@@ -9,8 +9,13 @@
 <meta name="assert" content="Use UAX9L1 to determine which space is at the end of the line, taking into account that such spaces, when pre-wrap, must hang.">
 
 <style>
+@font-face {
+    font-family: "Hasubi Mono";
+    src: url("/fonts/hasubi-mono/HasubiMono-Regular.woff2");
+}
+
 div {
-    font-family: monospace;
+    font-family: "Hasubi Mono", monospace;
     border: solid blue;
     font-size: 1.5em;
     white-space: pre-wrap;
@@ -19,10 +24,10 @@ div {
     border-color: orange;
     white-space: pre;
 }
-.w6 { width: 6ch; }
-.w7 { width: 7ch; }
-.w8 { width: 8ch; }
-.w9 { width: 9ch; }
+.w6 { width: 6.01ch; } /* .01 to cover floating point errors */
+.w7 { width: 7.01ch; }
+.w8 { width: 8.01ch; }
+.w9 { width: 9.01ch; }
 
 .blue { background: #aaaaff; }
 .red { background: #ffaaaa; }
diff --git a/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-004.html b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-004.html
new file mode 100644
index 00000000000..6d3ef998870
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/white-space/eol-spaces-bidi-004.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Text 3 test: trailing collapsible spaces and bidi</title>
+<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="reference/eol-spaces-bidi-004-ref.html">
+<link rel="match" href="reference/eol-spaces-bidi-alt-004-ref.html">
+<meta name="assert" content="Hanging space should take paragraph direction and show at the end of the line (blue box to the left)">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+
+<style>
+  div#test {
+      direction: rtl;
+      text-align: left;
+
+      font: 20px/1 Ahem;
+      margin-left: 20px;
+      background: green;
+      color: red;
+
+      width: 4ch;
+      white-space: pre-wrap;
+  }
+  span {
+      background: blue;
+  }
+  #green-cover {
+    position: absolute;
+    margin-left: 20px;
+    width: 60px;
+    height: 40px;
+    background:
+        linear-gradient(green, green) 0 0 / 60px 20px no-repeat,
+        linear-gradient(green, green) 0 20px / 20px 20px no-repeat;
+    z-index: 1;
+  }
+</style>
+<p>Test passes if a blue box (the white space) is visible at the left start in first line and <strong>no red</strong> is shown.</p>
+<div id="green-cover"></div>
+<div id="test"><span>XXX </span>X</div>
diff --git a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-001-ref.html b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-001-ref.html
index 430706c5569..2aa8f4a83c6 100644
--- a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-001-ref.html
+++ b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-001-ref.html
@@ -4,8 +4,13 @@
 <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
 
 <style>
+@font-face {
+    font-family: "Hasubi Mono";
+    src: url("/fonts/hasubi-mono/HasubiMono-Regular.woff2");
+}
+
 div {
-    font-family: monospace;
+    font-family: "Hasubi Mono", monospace;
     border: solid blue;
     font-size: 1.5em;
     white-space: pre;
@@ -13,9 +18,9 @@ div {
 .ref {
     border-color: orange;
 }
-.w5 { width: 5ch; }
-.w6 { width: 6ch; }
-.w7 { width: 7ch; }
+.w5 { width: 5.01ch; }
+.w6 { width: 6.01ch; }
+.w7 { width: 7.01ch; }
 
 .blue { background: #aaaaff; }
 .red { background: #ffaaaa; }
diff --git a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-002-ref.html b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-002-ref.html
index 30a4ffd303d..05b55463979 100644
--- a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-002-ref.html
+++ b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-002-ref.html
@@ -4,8 +4,13 @@
 <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
 
 <style>
+@font-face {
+    font-family: "Hasubi Mono";
+    src: url("/fonts/hasubi-mono/HasubiMono-Regular.woff2");
+}
+
 div {
-    font-family: monospace;
+    font-family: "Hasubi Mono", monospace;
     border: solid blue;
     font-size: 1.5em;
     white-space: pre;
@@ -13,10 +18,10 @@ div {
 .ref {
     border-color: orange;
 }
-.w6 { width: 6ch; }
-.w7 { width: 7ch; }
-.w8 { width: 8ch; }
-.w9 { width: 9ch; }
+.w6 { width: 6.01ch; }
+.w7 { width: 7.01ch; }
+.w8 { width: 8.01ch; }
+.w9 { width: 9.01ch; }
 
 .blue { background: #aaaaff; }
 .red { background: #ffaaaa; }
@@ -45,4 +50,3 @@ div {
 
 <div class="w9"><span class=pink> </span>A<span class=blue> </span>B<span class=red> </span>ا<span class=green> </span>ب<span class=yellow> </span></div>
 <div class="w9 ref"><span class=pink> </span>A<span class=blue> </span>B<span class=red> </span>ا<span class=green> </span>ب<span class=yellow> </span></div>
-
diff --git a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-004-ref.html b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-004-ref.html
new file mode 100644
index 00000000000..d845f2ac954
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-004-ref.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Text 3 test reference</title>
+<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+
+<style>
+  div#test {
+      text-align: right;
+
+      font: 20px/1 Ahem;
+      background: linear-gradient(green, green) 1ch 0 / cover no-repeat;
+
+      width: 5ch;
+      white-space: pre;
+
+      color: blue;
+  }
+</style>
+<p>Test passes if a blue box (the white space) is visible at the left start in first line and <strong>no red</strong> is shown.</p>
+<div id="test">X    <br> </div>
diff --git a/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-alt-004-ref.html b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-alt-004-ref.html
new file mode 100644
index 00000000000..4d068654a76
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/white-space/reference/eol-spaces-bidi-alt-004-ref.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Text 3 test reference</title>
+<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+
+<style>
+  div#test {
+      font: 20px/1 Ahem;
+      margin-left: 20px;
+      background: green;
+
+      width: 4ch;
+      white-space: pre;
+  }
+</style>
+<p>Test passes if a blue box (the white space) is visible at the left start in first line and <strong>no red</strong> is shown.</p>
+<div id="test"> <br> </div>
diff --git a/tests/wpt/tests/css/css-text/white-space/reference/text-wrap-balance-overflow-002-ref.html b/tests/wpt/tests/css/css-text/white-space/reference/text-wrap-balance-overflow-002-ref.html
new file mode 100644
index 00000000000..6d490101855
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/white-space/reference/text-wrap-balance-overflow-002-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<style>
+#test {
+  border: 1px solid gray;
+  font: 15px monospace;
+  width: 20ch;
+}
+</style>
+
+<body>
+<div id=test>
+Interconnect<br>your build
+</div>
diff --git a/tests/wpt/tests/css/css-text/white-space/text-wrap-balance-overflow-002.html b/tests/wpt/tests/css/css-text/white-space/text-wrap-balance-overflow-002.html
new file mode 100644
index 00000000000..0eee3bdbc87
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/white-space/text-wrap-balance-overflow-002.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#valdef-text-wrap-balance">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1878865">
+<link rel="match" href="reference/text-wrap-balance-overflow-002-ref.html">
+
+<style>
+#test {
+  border: 1px solid gray;
+  font: 15px monospace;
+  width: 20ch;
+  text-wrap: balance;
+}
+</style>
+
+<body onload="test.style.overflowWrap='anywhere'">
+<div id=test>
+Interconnect your build
+</div>
diff --git a/tests/wpt/tests/css/css-transitions/parsing/transition-computed.html b/tests/wpt/tests/css/css-transitions/parsing/transition-computed.html
index 51ec1baa8ab..ccd7f7e583f 100644
--- a/tests/wpt/tests/css/css-transitions/parsing/transition-computed.html
+++ b/tests/wpt/tests/css/css-transitions/parsing/transition-computed.html
@@ -19,16 +19,16 @@ test(() => {
   assert_equals(getComputedStyle(document.getElementById('target')).transition, "all");
 }, "Default transition value");
 
-test_computed_value("transition", "1s", "1s");
-test_computed_value("transition", "cubic-bezier(0, -2, 1, 3)", "cubic-bezier(0, -2, 1, 3)");
-test_computed_value("transition", "1s -3s", "1s -3s");
-test_computed_value("transition", "none", "none");
-test_computed_value("transition", "top", "top");
+test_computed_value("transition", "1s");
+test_computed_value("transition", "cubic-bezier(0, -2, 1, 3)");
+test_computed_value("transition", "1s -3s");
+test_computed_value("transition", "none");
+test_computed_value("transition", "top");
 
 test_computed_value("transition", "1s -3s cubic-bezier(0, -2, 1, 3) top", "top 1s cubic-bezier(0, -2, 1, 3) -3s");
 test_computed_value("transition", "1s -3s, cubic-bezier(0, -2, 1, 3) top", "1s -3s, top cubic-bezier(0, -2, 1, 3)");
 
-test_computed_value("transition", "all, all", "all, all");
+test_computed_value("transition", "all, all");
 
 test(() => {
   const target = document.getElementById('target');
diff --git a/tests/wpt/tests/css/css-transitions/parsing/transition-valid.html b/tests/wpt/tests/css/css-transitions/parsing/transition-valid.html
index ff9f5f782fd..ea4802f65c1 100644
--- a/tests/wpt/tests/css/css-transitions/parsing/transition-valid.html
+++ b/tests/wpt/tests/css/css-transitions/parsing/transition-valid.html
@@ -13,17 +13,17 @@
 <script>
 // <single-transition> = [ none | <single-transition-property> ] ||
 // <time> || <easing-function> || <time>
-test_valid_value("transition", "1s", ["1s", "all 1s ease 0s"]);
-test_valid_value("transition", "cubic-bezier(0, -2, 1, 3)", ["cubic-bezier(0, -2, 1, 3)", "all 0s cubic-bezier(0, -2, 1, 3) 0s"]);
-test_valid_value("transition", "1s -3s", ["1s -3s", "all 1s ease -3s"]);
-test_valid_value("transition", "none", ["none", "none 0s ease 0s"]);
-test_valid_value("transition", "top", ["top", "top 0s ease 0s"]);
+test_valid_value("transition", "1s");
+test_valid_value("transition", "cubic-bezier(0, -2, 1, 3)");
+test_valid_value("transition", "1s -3s");
+test_valid_value("transition", "none");
+test_valid_value("transition", "top");
 
 test_valid_value("transition", "1s -3s cubic-bezier(0, -2, 1, 3) top", "top 1s cubic-bezier(0, -2, 1, 3) -3s");
-test_valid_value("transition", "1s -3s, cubic-bezier(0, -2, 1, 3) top", ["1s -3s, top cubic-bezier(0, -2, 1, 3)", "all 1s ease -3s, top 0s cubic-bezier(0, -2, 1, 3) 0s"]);
+test_valid_value("transition", "1s -3s, cubic-bezier(0, -2, 1, 3) top", "1s -3s, top cubic-bezier(0, -2, 1, 3)");
 
-test_valid_value("transition", "all", ["all", "all 0s ease 0s"]);
-test_valid_value("transition", "all 1s", ["1s", "all 1s ease 0s"]);
+test_valid_value("transition", "all");
+test_valid_value("transition", "all 1s", "1s");
 
 test_valid_value("transition", "initial", "initial");
 
diff --git a/tests/wpt/tests/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html b/tests/wpt/tests/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html
new file mode 100644
index 00000000000..7254951db32
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/calc-size/animation/calc-size-width-interpolation.tentative.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>width: calc-size() animations</title>
+<link rel="help" href="https://drafts.csswg.org/css-values-5/">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/626#issuecomment-1800254442">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../../support/interpolation-testcommon.js"></script>
+
+<style>
+.parent {
+  display: block;
+  width: 200px;
+}
+.target {
+  display: block;
+}
+.target::before {
+  display: block;
+  content: "";
+  width: 100px;
+}
+</style>
+
+<body>
+
+<script>
+  test_interpolation({
+    property: 'width',
+    from: neutralKeyframe,
+    to: 'calc-size(auto, size * 2)',
+  }, [
+    { at: -0.25, expect: '150px' },
+    { at: 0, expect: '200px' },
+    { at: 0.25, expect: 'calc-size(auto, size * 1.25)' },
+    { at: 0.5, expect: 'calc-size(auto, size * 1.5)' },
+    { at: 0.75, expect: 'calc-size(auto, size * 1.75)' },
+    { at: 1, expect: 'calc-size(auto, size * 2)' },
+    { at: 1.25, expect: 'calc-size(auto, size * 2.25)' },
+  ]);
+
+  test_interpolation({
+    property: 'width',
+    from: 'calc-size(min-content, 0px)',
+    to: 'calc-size(min-content, size)',
+  }, [
+    { at: -0.25, expect: '0' },
+    { at: 0, expect: '0' },
+    { at: 0.25, expect: '25px' },
+    { at: 0.5, expect: '50px' },
+    { at: 0.75, expect: '75px' },
+    { at: 1, expect: '100px' },
+    { at: 1.25, expect: '125px' },
+  ]);
+
+</script>
diff --git a/tests/wpt/tests/css/css-values/calc-size/calc-size-parsing.tentative.html b/tests/wpt/tests/css/css-values/calc-size/calc-size-parsing.tentative.html
new file mode 100644
index 00000000000..fec24aaed13
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/calc-size/calc-size-parsing.tentative.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>calc-size() expressions</title>
+<link rel="help" href="https://drafts.csswg.org/css-values-5/">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/626#issuecomment-1800254442">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../support/parsing-testcommon.js"></script>
+
+<script>
+
+test_valid_value("width",      "calc-size(fit-content, size)");
+test_valid_value("height",     "calc-size(min-content, size * 2)");
+test_valid_value("max-width",  "calc-size(max-content, size / 2)");
+test_valid_value("max-height", "calc-size(fit-content, 30px + size / 2)");
+test_valid_value("width",      "calc-size(fit-content, 50% + size / 2)");
+
+test_valid_value("width",      "calc-size(any, 25em)");
+test_valid_value("width",      "calc-size(any, 40%)");
+test_valid_value("width",      "calc-size(any, 50px + 30%)", "calc-size(any, 30% + 50px)");
+test_invalid_value("width",    "calc-size(any, size)");
+test_invalid_value("width",    "calc-size(any, fit-content)");
+test_invalid_value("width",    "calc-size(any, max-content)");
+test_invalid_value("width",    "calc-size(any, min-content)");
+test_valid_value("width",      "calc-size(any, calc-size(10px, sign(size) * size))");
+test_invalid_value("width",    "calc-size(any, calc-size(10px, sign(size) * size) * sign(size))");
+
+test_valid_value("width", "calc-size(30px, 25em)");
+test_valid_value("width", "calc-size(calc-size(any, 30px), 25em)");
+test_valid_value("width", "calc-size(calc-size(2in, 30px), 25em)", "calc-size(calc-size(192px, 30px), 25em)");
+test_valid_value("width", "calc-size(calc-size(min-content, 30px), 25em)");
+test_valid_value("width", "calc-size(calc-size(min-content, size), size)");
+
+</script>
diff --git a/tests/wpt/tests/css/css-values/calc-size/calc-size-width.tentative.html b/tests/wpt/tests/css/css-values/calc-size/calc-size-width.tentative.html
new file mode 100644
index 00000000000..228f526752f
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/calc-size/calc-size-width.tentative.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<title>calc-size() on width</title>
+<link rel="help" href="https://drafts.csswg.org/css-values-5/">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/626#issuecomment-1800254442">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+  #container {
+    font-family: 'Ahem';
+    font-size: 20px;
+    width: 500px;
+  }
+  #target {
+  }
+</style>
+
+<div id="container">
+  <!--
+    Given the contents of #target (and the Ahem font):
+      max-content width is 30ch or 600px
+      min-content width is 20ch or 400px
+  -->
+  <div id="target">ninechars twenty_characters___</div>
+</div>
+
+<script>
+
+setup({explicit_done: true});
+document.fonts.ready.then(()=> {
+  let basic_tests = [
+    { value: "calc-size(any, 357px)", expected: "357px" },
+    { value: "calc-size(any, 31%)", expected: "155px" },
+    { value: "calc-size(max-content, 31%)", expected: "155px" },
+    { value: "calc-size(fit-content, 72px)", expected: "72px" },
+    { value: "calc-size(37px, 93px)", expected: "93px" },
+    { value: "calc-size(83px, size * 3)", expected: "249px" },
+    { value: "calc-size(min-content, size / 2)", expected: "200px" },
+    { value: "calc-size(max-content, size * 1.2)", expected: "720px" },
+    { value: "calc-size(fit-content, size / 4 + 30px)", expected: "155px" },
+    { value: "calc-size(stretch, size / 2 - 10%)", expected: "200px" },
+    { value: "calc-size(30px, 15em)", expected: "300px" },
+    { value: "calc-size(calc-size(any, 30px), 15em)", expected: "300px" },
+    { value: "calc-size(calc-size(2in, 30px), 15em)", expected: "300px" },
+    { value: "calc-size(calc-size(min-content, 30px), 15em)", expected: "300px" },
+    { value: "calc-size(calc-size(min-content, size), size)", expected: "400px" },
+  ];
+  const container = document.getElementById("container");
+  const target = document.getElementById("target");
+  const target_cs = getComputedStyle(target);
+  for (const obj of basic_tests) {
+    test((t) => {
+      target.style.removeProperty("width");
+      target.style.width = obj.value;
+      assert_equals(target_cs.width, obj.expected);
+    }, `resolved width for width: ${obj.value}`);
+  }
+
+  target.style.width = "calc-size(fit-content, size / 2)";
+  let container_size_tests = [
+    { container_width: "300px", expected: "200px" },
+    { container_width: "500px", expected: "250px" },
+    { container_width: "700px", expected: "300px" },
+  ];
+  for (const obj of container_size_tests) {
+    test((t) => {
+      container.style.width = obj.container_width;
+      assert_equals(target_cs.width, obj.expected);
+    }, `resolved width for width: ${target.style.width} with container width ${obj.container_width}`);
+  }
+  container.style.width = "";
+
+  done();
+});
+
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/iframe-transition-destroyed-document-crash.html b/tests/wpt/tests/css/css-view-transitions/iframe-transition-destroyed-document-crash.html
new file mode 100644
index 00000000000..31f6a10ed62
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/iframe-transition-destroyed-document-crash.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transitions: crash test</title>
+<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+<script src="/common/reftest-wait.js"></script>
+<html>
+<head>
+<script>
+function eventhandler1() {
+  var var00106 = htmlvar00011.contentDocument;
+  var var00228 = var00106.startViewTransition();
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      requestAnimationFrame(takeScreenshot);
+    })
+  });
+}
+
+</script>
+</head>
+<body>
+<iframe id="htmlvar00011" onunload="eventhandler3()" border="0" srcdoc="A#:^;&lt;gV&lt;&gt;8" style=":{,J" referrerpolicy="unsafe-url" background="!xp&gt;" nohref="nohref" nonce="nonce" inputEncoding="s" offsetX="0.3538512271910753">:+j&amp;;&amp;-^&gt;.7xf\jZ1,xb</iframe>
+<style id="htmlvar00014" nonce="nonce" media="screen and (min-width:0px)" onerror="eventhandler1()" onload="eventhandler1()" dir="N5!" updateRangeEnd="0" abbr="4IvGMN[Wxd" symbols="=d##y#)DA4V8ya}KO.cv" frameBorder="^b*]&amp;:|#lB:" search="N">ynFXo*</style>
+</body>
+</html>
+
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-entry.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-entry.html
new file mode 100644
index 00000000000..44f95dccbf4
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-entry.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: entry animation should consider view-transition-class from new state</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+}
+
+#target.new-state {
+  view-transition-class: cls;
+  view-transition-name: target;
+}
+
+@keyframes jump {
+  from { opacity: 1;}
+  to { opacity: 1;}
+}
+
+::view-transition-group(*),
+::view-transition-image-pair(*),
+::view-transition-new(*) {
+  animation-name: jump;
+  animation-timing-function: step-start;
+  animation-duration: 1s;
+}
+
+::view-transition-new(*.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition(() => {
+    document.getElementById("target").classList.add("new-state");
+  }).ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-exit.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-exit.html
new file mode 100644
index 00000000000..c687461f18e
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-exit.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: exit animation should consider view-transition-class from old state</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+}
+
+#target:not(.new-state) {
+  view-transition-class: cls;
+  view-transition-name: target;
+}
+
+@keyframes jump {
+  from { opacity: 1;}
+  to { opacity: 1;}
+}
+
+::view-transition-group(*),
+::view-transition-image-pair(*),
+::view-transition-old(*) {
+  animation-name: jump;
+  animation-timing-function: step-start;
+  animation-duration: 1s;
+}
+
+::view-transition-old(*.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition(() => {
+    document.getElementById("target").classList.add("new-state");
+  }).ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-ident.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-ident.html
new file mode 100644
index 00000000000..1418a90bc45
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-ident.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should match ident.class</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(target.cls),
+::view-transition-old(target.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple-wildcard.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple-wildcard.html
new file mode 100644
index 00000000000..53eaacfe799
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple-wildcard.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should match with wildcard and multiple classes</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls some-div;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*.cls.some-div),
+::view-transition-old(*.cls.some-div) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple.html
new file mode 100644
index 00000000000..1ab69340b4b
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-multiple.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should match with multiple classes</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+  view-transition-class: cls some-div;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(target.cls.some-div),
+::view-transition-old(target.cls.some-div) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-wildard.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-wildard.html
new file mode 100644
index 00000000000..13490d58786
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-match-wildard.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should match with wildcard</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*.cls),
+::view-transition-old(*.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-ident.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-ident.html
new file mode 100644
index 00000000000..97db64fca20
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-ident.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should not match different ident</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*),
+::view-transition-old(*) {
+  left: 100px;
+}
+
+::view-transition-new(target.other),
+::view-transition-old(target.other) {
+  left: 0;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-partial.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-partial.html
new file mode 100644
index 00000000000..9d9838036bc
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-partial.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should not match if only some classes match</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*),
+::view-transition-old(*) {
+  left: 100px;
+}
+::view-transition-new(target.cls.other),
+::view-transition-old(target.cls.other) {
+  left: 0;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-wildcard.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-wildcard.html
new file mode 100644
index 00000000000..722e4130455
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-mismatch-wildcard.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should not match if only some classes match (with *)</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*),
+::view-transition-old(*) {
+  left: 100px;
+}
+
+::view-transition-new(*.other),
+::view-transition-old(*.other) {
+  left: 0;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-multiple-vt-classes.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-multiple-vt-classes.html
new file mode 100644
index 00000000000..d7ca0a04936
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-multiple-vt-classes.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: selector should match when view-transition-class has multiple idents</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+  view-transition-class: cls some-div;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(target.cls),
+::view-transition-old(target.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-new-with-class-old-without.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-new-with-class-old-without.html
new file mode 100644
index 00000000000..5aedc33b3c1
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-new-with-class-old-without.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: view-transition-class should apply if applied only in new state</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+}
+
+#target.new-state {
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*.cls),
+::view-transition-old(*.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition(() => {
+    document.getElementById("target").classList.add("new-state");
+  }).ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-old-with-class-new-without.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-old-with-class-new-without.html
new file mode 100644
index 00000000000..6c153253e00
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-old-with-class-new-without.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: view-transition-class should not apply if applied only in old state</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+div {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+}
+
+#target {
+  background: green;
+  view-transition-name: target;
+}
+
+#target:not(.new-state) {
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-new(*),
+::view-transition-old(*) {
+  left: 100px;
+}
+
+::view-transition-new(*.cls),
+::view-transition-old(*.cls) {
+  left: 0;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition(() => {
+    document.querySelector("#target").classList.add("new-state");
+  }).ready.then(takeScreenshot);
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-ref.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-ref.html
new file mode 100644
index 00000000000..89b3a8a78ef
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-ref.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+<title>View transitions: reference expectation</title>
+<style>
+div {
+  position: relative;
+  left: 100px;
+  width: 100px;
+  height: 100px;
+  background: green;
+}
+</style>
+<body>
+<div></div>
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-group.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-group.html
new file mode 100644
index 00000000000..3e4dbb303c6
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-group.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: group selectors should respect classes</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+:root::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+:root::view-transition-group(target.cls) {
+  left: 100px;
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(requestAnimationFrame(() => takeScreenshot()));
+});
+</script>
diff --git a/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-image-pair.html b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-image-pair.html
new file mode 100644
index 00000000000..8f0f2ef2a97
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/pseudo-with-classes-view-transition-image-pair.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<title>View transition classes: group selectors should respect classes</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions-2/">
+<link rel="author" href="mailto:nrosenthal@chromium.org">
+<link rel="match" href="pseudo-with-classes-ref.html">
+<script src="/common/rendering-utils.js"></script>
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  position: absolute;
+  background: green;
+  view-transition-name: target;
+  view-transition-class: cls;
+}
+
+::view-transition-group(*) {
+  animation-duration: 1s;
+}
+
+::view-transition-image-pair(target.cls) {
+  transform: translateX(100px);
+}
+
+</style>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+window.addEventListener("load", () => {
+  document.startViewTransition().ready.then(requestAnimationFrame(() => takeScreenshot()));
+});
+</script>
diff --git a/tests/wpt/tests/css/cssom-view/offsetTopLeft-table-caption.html b/tests/wpt/tests/css/cssom-view/offsetTopLeft-table-caption.html
new file mode 100644
index 00000000000..9ee5619e20c
--- /dev/null
+++ b/tests/wpt/tests/css/cssom-view/offsetTopLeft-table-caption.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-htmlelement-offsetparent">
+<title>offset* APIs on tables with captions.</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<table style="border-spacing: 0px">
+ <caption>I'm a <br>reasonably<br>tall caption.</caption>
+ <tr><td><span>I'm a cell.</span>
+</table>
+<script>
+  let td = document.querySelector("td");
+  let span = document.querySelector("span");
+  let caption = document.querySelector("caption");
+  let table = document.querySelector("table");
+  test(function() {
+    assert_equals(span.offsetParent, td, "<td> should be an offset parent");
+    assert_equals(td.offsetParent, table, "<table> should be an offset parent for <td>");
+    assert_equals(caption.offsetParent, table, "<table> should be an offset parent for <caption>");
+    assert_equals(caption.offsetTop, 0, "<caption> is at the top of its offsetParent");
+    assert_equals(td.offsetTop, caption.offsetHeight, "<td> is under the caption");
+  });
+</script>
diff --git a/tests/wpt/tests/css/cssom-view/scroll-zoom.html b/tests/wpt/tests/css/cssom-view/scroll-zoom.html
index 1fe4a8acc4a..85808887fd3 100644
--- a/tests/wpt/tests/css/cssom-view/scroll-zoom.html
+++ b/tests/wpt/tests/css/cssom-view/scroll-zoom.html
@@ -58,6 +58,29 @@
           assert_equals(noZoom.scrollWidth*2, scrollerWithZoomContent.scrollWidth, 'scroll width for zoomed content');
           assert_equals(noZoom.scrollHeight, scrollerInZoomedElement.scrollHeight, 'scroll height for scroller in zoomed element');
           assert_equals(noZoom.scrollWidth, scrollerInZoomedElement.scrollWidth, 'scroll width for scroller in zoomed element');
-        });
+        }, `scroll{Width, Height}`);
+
+        test(function() {
+          assert_equals(noZoom.scrollTop, 0, 'scrollTop should be 0');
+          assert_equals(noZoom.scrollLeft, 0, 'scrollLeft should be 0');
+
+          assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop');
+          assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft');
+
+          noZoom.scrollTo(noZoom.scrollWidth / 2, noZoom.scrollHeight / 2);
+          withZoom.scrollTo(withZoom.scrollWidth / 2, withZoom.scrollHeight / 2);
+
+          assert_not_equals(noZoom.scrollTop, 0, 'scrollTop should not be 0');
+          assert_not_equals(noZoom.scrollLeft, 0, 'scrollLeft should not be 0');
+
+          assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop after scrollTo');
+          assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft after scrollTo');
+
+          noZoom.scrollBy(2, 2);
+          withZoom.scrollBy(2, 2);
+
+          assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop after scrollBy');
+          assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft after scrollBy');
+        }, `scroll{Top, Left}`);
       </script>
-  </body>
\ No newline at end of file
+  </body>
diff --git a/tests/wpt/tests/css/selectors/invalidation/nth-child-in-shadow-root.html b/tests/wpt/tests/css/selectors/invalidation/nth-child-in-shadow-root.html
index 9e6a5b129a3..1618033c959 100644
--- a/tests/wpt/tests/css/selectors/invalidation/nth-child-in-shadow-root.html
+++ b/tests/wpt/tests/css/selectors/invalidation/nth-child-in-shadow-root.html
@@ -4,7 +4,6 @@
 <link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1480746">
 <link rel="author" title="Zach Hoffman" href="mailto:zach@zrhoffman.net">
 <link rel="match" href="nth-child-in-shadow-root-ref.html">
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <div id="host">
     <template shadowrootmode="open">
         <div id="firstChild">Should be red</div>
@@ -19,7 +18,6 @@
     </template>
 </div>
 <script>
-polyfill_declarative_shadow_dom(host);
 host.offsetTop;
 let div = document.createElement("div");
 div.appendChild(document.createTextNode("Should be green"));
diff --git a/tests/wpt/tests/css/selectors/invalidation/nth-child-of-in-shadow-root.html b/tests/wpt/tests/css/selectors/invalidation/nth-child-of-in-shadow-root.html
index 4195a14a3ed..519885ea785 100644
--- a/tests/wpt/tests/css/selectors/invalidation/nth-child-of-in-shadow-root.html
+++ b/tests/wpt/tests/css/selectors/invalidation/nth-child-of-in-shadow-root.html
@@ -3,7 +3,6 @@
 <link rel="author" title="Steinar H. Gunderson" href="sesse@chromium.org">
 <link rel="match" href="nth-child-of-in-shadow-root-ref.html">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <div id="host">
   <template shadowrootmode="open">
     <style>
@@ -17,7 +16,6 @@
   </template>
 </div>
 <script>
-  polyfill_declarative_shadow_dom(host);
   host.offsetTop;
   host.shadowRoot.getElementById('toggler').classList.toggle('foo');
 </script>
diff --git a/tests/wpt/tests/css/selectors/invalidation/nth-last-child-in-shadow-root.html b/tests/wpt/tests/css/selectors/invalidation/nth-last-child-in-shadow-root.html
index a14f4765674..4145bf74984 100644
--- a/tests/wpt/tests/css/selectors/invalidation/nth-last-child-in-shadow-root.html
+++ b/tests/wpt/tests/css/selectors/invalidation/nth-last-child-in-shadow-root.html
@@ -4,7 +4,6 @@
 <link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1480746">
 <link rel="author" title="Zach Hoffman" href="mailto:zach@zrhoffman.net">
 <link rel="match" href="nth-last-child-in-shadow-root-ref.html">
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <div id="host">
     <template shadowrootmode="open">
         <div id="firstChild">Should be red</div>
@@ -19,7 +18,6 @@
     </template>
 </div>
 <script>
-polyfill_declarative_shadow_dom(host);
 host.offsetTop;
 let div = document.createElement("div");
 div.appendChild(document.createTextNode("Should be green"));
diff --git a/tests/wpt/tests/css/selectors/invalidation/nth-last-child-of-in-shadow-root.html b/tests/wpt/tests/css/selectors/invalidation/nth-last-child-of-in-shadow-root.html
index d4031117857..7ae04f302ca 100644
--- a/tests/wpt/tests/css/selectors/invalidation/nth-last-child-of-in-shadow-root.html
+++ b/tests/wpt/tests/css/selectors/invalidation/nth-last-child-of-in-shadow-root.html
@@ -5,7 +5,6 @@
 <link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">
 <link rel="match" href="nth-last-child-of-in-shadow-root-ref.html">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <div id="host">
   <template shadowrootmode="open">
     <style>
@@ -19,7 +18,6 @@
   </template>
 </div>
 <script>
-  polyfill_declarative_shadow_dom(host);
   host.offsetTop;
   host.shadowRoot.getElementById("toggler").classList.toggle("foo");
 </script>
diff --git a/tests/wpt/tests/css/selectors/invalidation/part-pseudo.html b/tests/wpt/tests/css/selectors/invalidation/part-pseudo.html
index a409271762f..eee8bf55228 100644
--- a/tests/wpt/tests/css/selectors/invalidation/part-pseudo.html
+++ b/tests/wpt/tests/css/selectors/invalidation/part-pseudo.html
@@ -6,8 +6,7 @@
   <link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
   <link rel="match" href="part-pseudo-ref.html">
   <style id="sheet">#host::part(green) { color: red; }</style>
-  <script src="/resources/declarative-shadow-dom-polyfill.js"></script>
-</head>
+  </head>
 <body>
   <div id="host">
     <template shadowrootmode="open">
diff --git a/tests/wpt/tests/css/selectors/open-closed-pseudo.html b/tests/wpt/tests/css/selectors/open-closed-pseudo.html
new file mode 100644
index 00000000000..9301fd2f416
--- /dev/null
+++ b/tests/wpt/tests/css/selectors/open-closed-pseudo.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://drafts.csswg.org/selectors-4/#open-state">
+<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>
+
+<dialog>dialog</dialog>
+
+<details>details</details>
+
+<select>
+  <option>one</option>
+</select>
+
+<script>
+test(() => {
+  const dialog = document.querySelector('dialog');
+  assert_true(dialog.matches(':closed'),
+    ':closed should match when the dialog is closed.');
+  assert_false(dialog.matches(':open'),
+    ':open should not match when the dialog is closed.');
+
+  dialog.show();
+  assert_false(dialog.matches(':closed'),
+    ':closed should not match after dialog.open().');
+  assert_true(dialog.matches(':open'),
+    ':open should match after dialog.open().');
+
+  dialog.close();
+  dialog.showModal();
+  assert_false(dialog.matches(':closed'),
+    ':closed should not match after dialog.showModal().');
+  assert_true(dialog.matches(':open'),
+    ':open should match after dialog.showModal().');
+
+  dialog.close();
+}, 'The dialog element should support :open and :closed.');
+
+test(() => {
+  const details = document.querySelector('details');
+  assert_true(details.matches(':closed'),
+    ':closed should match when the details is closed.');
+  assert_false(details.matches(':open'),
+    ':open should not match when the details is closed.');
+
+  details.open = true;
+  assert_false(details.matches(':closed'),
+    ':closed should not match when the details is open.');
+  assert_true(details.matches(':open'),
+    ':open should match when the details is open.');
+}, 'The details element should support :open and :closed.');
+
+promise_test(async () => {
+  const select = document.querySelector('select');
+  assert_true(select.matches(':closed'),
+    ':closed should match when the select is closed.');
+  assert_false(select.matches(':open'),
+    ':open should not match when the select is closed.');
+
+  await test_driver.click(select);
+  await new Promise(requestAnimationFrame);
+  assert_false(select.matches(':closed'),
+    ':closed should not match when the select is open.');
+  assert_true(select.matches(':open'),
+    ':open should match when the select is open.');
+}, 'The select element should support :open and :closed.');
+</script>
diff --git a/tests/wpt/tests/css/selectors/user-invalid.html b/tests/wpt/tests/css/selectors/user-invalid.html
index 12a3b83862c..5f8fa5811af 100644
--- a/tests/wpt/tests/css/selectors/user-invalid.html
+++ b/tests/wpt/tests/css/selectors/user-invalid.html
@@ -28,6 +28,7 @@
 <form id="form">
   <input placeholder="Required field" required id="required-input"><br>
   <textarea placeholder="Required field" required id="required-textarea"></textarea><br>
+  <input type="checkbox" required id="required-checkbox"><br>
   <input type="submit" id="submit-button">
   <input type="reset" id="reset-button">
 </form>
@@ -78,11 +79,13 @@ promise_test(async () => {
   const form = document.querySelector("#form");
   const requiredInput = document.querySelector("#required-input");
   const requiredTextarea = document.querySelector("#required-textarea");
+  const requiredCheckbox = document.querySelector("#required-checkbox");
   const submitButton = document.querySelector("#submit-button");
   const resetButton = document.querySelector("#reset-button");
 
   assert_false(requiredInput.validity.valid);
   assert_false(requiredTextarea.validity.valid);
+  assert_false(requiredCheckbox.validity.valid);
   // The selector can't match because no interaction has happened.
   assert_false(requiredInput.matches(":user-valid"), "Initially does not match :user-valid");
   assert_false(requiredInput.matches(":user-invalid"), "Initially does not match :user-invalid");
@@ -90,6 +93,9 @@ promise_test(async () => {
   assert_false(requiredTextarea.matches(":user-valid"), "Initially does not match :user-valid");
   assert_false(requiredTextarea.matches(":user-invalid"), "Initially does not match :user-invalid");
 
+  assert_false(requiredCheckbox.matches(":user-valid"), "Initially does not match :user-valid");
+  assert_false(requiredCheckbox.matches(":user-invalid"), "Initially does not match :user-invalid");
+
   submitButton.click();
 
   assert_true(requiredInput.matches(":user-invalid"), "Submitted the form, input is validated");
@@ -98,6 +104,9 @@ promise_test(async () => {
   assert_true(requiredTextarea.matches(":user-invalid"), "Submitted the form, textarea is validated");
   assert_false(requiredTextarea.matches(":user-valid"), "Submitted the form, textarea is validated");
 
+  assert_true(requiredCheckbox.matches(":user-invalid"), "Submitted the form, checkbox is validated");
+  assert_false(requiredCheckbox.matches(":user-valid"), "Submitted the form, checkbox is validated");
+
   resetButton.click();
 
   assert_false(requiredInput.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
@@ -106,6 +115,9 @@ promise_test(async () => {
   assert_false(requiredTextarea.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
   assert_false(requiredTextarea.matches(":user-invalid"), "Reset the form, user-interacted flag is reset");
 
+  assert_false(requiredCheckbox.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
+  assert_false(requiredCheckbox.matches(":user-invalid"), "Reset the form, user-interacted flag is reset");
+
   // Test programmatic form submission with constraint validation.
   form.requestSubmit();
 
@@ -114,6 +126,9 @@ promise_test(async () => {
 
   assert_true(requiredTextarea.matches(":user-invalid"), "Called form.requestSubmit(), textarea is validated");
   assert_false(requiredTextarea.matches(":user-valid"), "Called form.requestSubmit(), textarea is validated");
+
+  assert_true(requiredCheckbox.matches(":user-invalid"), "Called form.requestSubmit(), checkbox is validated");
+  assert_false(requiredCheckbox.matches(":user-valid"), "Called form.requestSubmit(), checkbox is validated");
 }, ":user-invalid selector properly interacts with submit & reset buttons");
 
 // historical: https://github.com/w3c/csswg-drafts/issues/1329
@@ -151,4 +166,31 @@ test(() => {
       'Element should not match :user-valid after the test.');
   }, `${elementId}: A required input or textarea should match :user-invalid if a user types into it and then clears it before blurring.`);
 });
+
+promise_test(async () => {
+  const checkbox = document.getElementById('required-checkbox');
+
+  const resetButton = document.getElementById('reset-button');
+  resetButton.click();
+  assert_false(checkbox.matches(':user-invalid'),
+    'Checkbox should not match :user-invalid at the start of the test.');
+  assert_false(checkbox.checked,
+    'Checkbox should not be checked at the start of the test.');
+
+  checkbox.checked = true;
+  assert_false(checkbox.matches(':user-invalid'),
+    'Checkbox should not match :user-invalid after programatically changing value.');
+  checkbox.checked = false;
+  assert_false(checkbox.matches(':user-invalid'),
+    'Checkbox should not match :user-invalid after programatically changing value.');
+
+  await test_driver.click(checkbox);
+  assert_true(checkbox.checked, 'Checkbox should be checked after clicking once.');
+  assert_false(checkbox.matches(':user-invalid'),
+    'Checkbox should not match :user-invalid after checking it.');
+  await test_driver.click(checkbox);
+  assert_false(checkbox.checked, 'Checkbox should not be checked after clicking twice.');
+  assert_true(checkbox.matches(':user-invalid'),
+    'Checkbox should match :user-invalid after clicking twice.');
+}, 'A required checkbox should match :user-invalid if the user unchecks it and blurs.');
 </script>
diff --git a/tests/wpt/tests/css/selectors/user-valid.html b/tests/wpt/tests/css/selectors/user-valid.html
index 009286f0eb5..7a12eb237d3 100644
--- a/tests/wpt/tests/css/selectors/user-valid.html
+++ b/tests/wpt/tests/css/selectors/user-valid.html
@@ -28,6 +28,7 @@
 <form id="form">
   <input placeholder="Optional field" id="optional-input"><br>
   <textarea placeholder="Optional field" id="optional-textarea"></textarea><br>
+  <input type="checkbox" id="optional-checkbox"><br>
   <input required placeholder="Required field"> <!-- Prevent the form from navigating with this invalid input -->
   <input type="submit" id="submit-button">
   <input type="reset" id="reset-button">
@@ -75,11 +76,13 @@ promise_test(async () => {
   const form = document.querySelector("#form");
   const optionalInput = document.querySelector("#optional-input");
   const optionalTextarea = document.querySelector("#optional-textarea");
+  const optionalCheckbox = document.querySelector("#optional-checkbox");
   const submitButton = document.querySelector("#submit-button");
   const resetButton = document.querySelector("#reset-button");
 
   assert_true(optionalInput.validity.valid);
   assert_true(optionalTextarea.validity.valid);
+  assert_true(optionalCheckbox.validity.valid);
   // The selector can't match because no interaction has happened.
   assert_false(optionalInput.matches(":user-valid"), "Initially does not match :user-valid");
   assert_false(optionalInput.matches(":user-invalid"), "Initially does not match :user-invalid");
@@ -87,6 +90,9 @@ promise_test(async () => {
   assert_false(optionalTextarea.matches(":user-valid"), "Initially does not match :user-valid");
   assert_false(optionalTextarea.matches(":user-invalid"), "Initially does not match :user-invalid");
 
+  assert_false(optionalCheckbox.matches(":user-valid"), "Initially does not match :user-valid");
+  assert_false(optionalCheckbox.matches(":user-invalid"), "Initially does not match :user-invalid");
+
   submitButton.click();
 
   assert_true(optionalInput.matches(":user-valid"), "Submitted the form, input is validated");
@@ -95,6 +101,9 @@ promise_test(async () => {
   assert_true(optionalTextarea.matches(":user-valid"), "Submitted the form, textarea is validated");
   assert_false(optionalTextarea.matches(":user-invalid"), "Submitted the form, textarea is validated");
 
+  assert_true(optionalCheckbox.matches(":user-valid"), "Submitted the form, checkbox is validated");
+  assert_false(optionalCheckbox.matches(":user-invalid"), "Submitted the form, checkbox is validated");
+
   resetButton.click();
 
   assert_false(optionalInput.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
@@ -103,6 +112,9 @@ promise_test(async () => {
   assert_false(optionalTextarea.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
   assert_false(optionalTextarea.matches(":user-invalid"), "Reset the form, user-interacted flag is reset");
 
+  assert_false(optionalCheckbox.matches(":user-valid"), "Reset the form, user-interacted flag is reset");
+  assert_false(optionalCheckbox.matches(":user-invalid"), "Reset the form, user-interacted flag is reset");
+
   // Test programmatic form submission with constraint validation.
   form.requestSubmit();
 
@@ -111,5 +123,32 @@ promise_test(async () => {
 
   assert_true(optionalTextarea.matches(":user-valid"), "Called form.requestSubmit(), textarea is validated");
   assert_false(optionalTextarea.matches(":user-invalid"), "Called form.requestSubmit(), textarea is validated");
+
+  assert_true(optionalCheckbox.matches(":user-valid"), "Called form.requestSubmit(), checkbox is validated");
+  assert_false(optionalCheckbox.matches(":user-invalid"), "Called form.requestSubmit(), checkbox is validated");
 }, ":user-valid selector properly interacts with submit & reset buttons");
+
+promise_test(async () => {
+  const checkbox = document.getElementById('optional-checkbox');
+
+  const resetButton = document.getElementById('reset-button');
+  resetButton.click();
+  assert_false(checkbox.matches(':user-valid'),
+    'Checkbox should not match :user-valid at the start of the test.');
+  assert_false(checkbox.checked,
+    'Checkbox should not be checked at the start of the test.');
+
+  checkbox.checked = true;
+  assert_false(checkbox.matches(':user-valid'),
+    'Checkbox should not match :user-valid after programatically changing value.');
+  checkbox.checked = false;
+  assert_false(checkbox.matches(':user-valid'),
+    'Checkbox should not match :user-valid after programatically changing value.');
+
+  await test_driver.click(checkbox);
+  assert_true(checkbox.checked, 'Checkbox should be checked after clicking once.');
+
+  assert_true(checkbox.matches(':user-valid'),
+    'Checkbox should match :user-valid after clicking once.');
+}, 'Checkboxes should match :user-valid after the user clicks on it.');
 </script>
diff --git a/tests/wpt/tests/css/zoom/tentative/image-intrinsic-size.html b/tests/wpt/tests/css/zoom/tentative/image-intrinsic-size.html
new file mode 100644
index 00000000000..d152bb24eef
--- /dev/null
+++ b/tests/wpt/tests/css/zoom/tentative/image-intrinsic-size.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Zoom affects image intrinsic sizes</title>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://drafts.csswg.org/css-viewport/#zoom-property">
+<link rel="match" href="background-image-ref.html">
+<style>
+img {
+  vertical-align: top;
+  zoom: .5;
+}
+</style>
+<img src="/images/pattern.png">
diff --git a/tests/wpt/tests/dom/common.js b/tests/wpt/tests/dom/common.js
index 70367b2efff..97d7da542bc 100644
--- a/tests/wpt/tests/dom/common.js
+++ b/tests/wpt/tests/dom/common.js
@@ -55,6 +55,13 @@ function setupRangeTests() {
     paras[4].textContent = "Ghijklmn";
     testDiv.appendChild(paras[4]);
 
+    paras.push(document.createElement("p"));
+    const xmlDocument = new Document();
+    paras[5].appendChild(xmlDocument.createCDATASection("1234"));
+    paras[5].appendChild(xmlDocument.createCDATASection("5678"));
+    paras[5].append("9012");
+    testDiv.appendChild(paras[5]);
+
     detachedDiv = document.createElement("div");
     detachedPara1 = document.createElement("p");
     detachedPara1.appendChild(document.createTextNode("Opqrstuv"));
@@ -128,6 +135,8 @@ function setupRangeTests() {
         "[paras[0].firstChild, 2, paras[0].firstChild, 9]",
         "[paras[1].firstChild, 0, paras[1].firstChild, 0]",
         "[paras[1].firstChild, 2, paras[1].firstChild, 9]",
+        "[paras[5].firstChild, 2, paras[5].lastChild, 4]",
+        "[paras[5].firstChild, 1, paras[5].firstChild, 3]",
         "[detachedPara1.firstChild, 0, detachedPara1.firstChild, 0]",
         "[detachedPara1.firstChild, 2, detachedPara1.firstChild, 8]",
         "[foreignPara1.firstChild, 0, foreignPara1.firstChild, 0]",
@@ -210,6 +219,8 @@ function setupRangeTests() {
         "[paras[1].firstChild, 9]",
         "[paras[1].firstChild, 10]",
         "[paras[1].firstChild, 65535]",
+        "[paras[5].firstChild, 2]",
+        "[paras[5].firstChild, 20]",
         "[detachedPara1.firstChild, 0]",
         "[detachedPara1.firstChild, 1]",
         "[detachedPara1.firstChild, 8]",
@@ -290,6 +301,7 @@ function setupRangeTests() {
         "paras[0]",
         "paras[0].firstChild",
         "paras[1].firstChild",
+        "paras[5].firstChild",
         "foreignPara1",
         "foreignPara1.firstChild",
         "detachedPara1",
@@ -337,7 +349,7 @@ if ("setup" in window) {
 }
 
 /**
- * The "length" of a node as defined by the Ranges section of DOM4.
+ * The "length" of a node as defined by DOM.
  */
 function nodeLength(node) {
     // "The length of a node node depends on node:
@@ -347,14 +359,11 @@ function nodeLength(node) {
     if (node.nodeType == Node.DOCUMENT_TYPE_NODE) {
         return 0;
     }
-    // "Text
-    // "ProcessingInstruction
-    // "Comment
-    //   "Its length attribute value."
+    // "If node is a CharacterData node, then return node’s data’s length."
     // Browsers don't historically support the length attribute on
     // ProcessingInstruction, so to avoid spurious failures, do
     // node.data.length instead of node.length.
-    if (node.nodeType == Node.TEXT_NODE || node.nodeType == Node.PROCESSING_INSTRUCTION_NODE || node.nodeType == Node.COMMENT_NODE) {
+    if (isText(node) || node.nodeType == Node.PROCESSING_INSTRUCTION_NODE || node.nodeType == Node.COMMENT_NODE) {
         return node.data.length;
     }
     // "Any other node
@@ -593,10 +602,9 @@ function myExtractContents(range) {
     var originalEndNode = range.endContainer;
     var originalEndOffset = range.endOffset;
 
-    // "If original start node is original end node, and they are a Text,
-    // ProcessingInstruction, or Comment node:"
+    // "If original start node is original end node and it is a CharacterData node, then:"
     if (range.startContainer == range.endContainer
-    && (range.startContainer.nodeType == Node.TEXT_NODE
+    && (isText(range.startContainer)
     || range.startContainer.nodeType == Node.PROCESSING_INSTRUCTION_NODE
     || range.startContainer.nodeType == Node.COMMENT_NODE)) {
         // "Let clone be the result of calling cloneNode(false) on original
@@ -709,10 +717,9 @@ function myExtractContents(range) {
         newOffset = 1 + indexOf(referenceNode);
     }
 
-    // "If first partially contained child is a Text, ProcessingInstruction, or
-    // Comment node:"
+    // "If first partially contained child is a CharacterData node, then:"
     if (firstPartiallyContainedChild
-    && (firstPartiallyContainedChild.nodeType == Node.TEXT_NODE
+    && (isText(firstPartiallyContainedChild)
     || firstPartiallyContainedChild.nodeType == Node.PROCESSING_INSTRUCTION_NODE
     || firstPartiallyContainedChild.nodeType == Node.COMMENT_NODE)) {
         // "Let clone be the result of calling cloneNode(false) on original
@@ -768,10 +775,9 @@ function myExtractContents(range) {
         frag.appendChild(containedChildren[i]);
     }
 
-    // "If last partially contained child is a Text, ProcessingInstruction, or
-    // Comment node:"
+    // "If last partially contained child is a CharacterData node, then:"
     if (lastPartiallyContainedChild
-    && (lastPartiallyContainedChild.nodeType == Node.TEXT_NODE
+    && (isText(lastPartiallyContainedChild)
     || lastPartiallyContainedChild.nodeType == Node.PROCESSING_INSTRUCTION_NODE
     || lastPartiallyContainedChild.nodeType == Node.COMMENT_NODE)) {
         // "Let clone be the result of calling cloneNode(false) on original
@@ -833,7 +839,7 @@ function myInsertNode(range, node) {
     // "HierarchyRequestError" exception and terminate these steps."
     if (range.startContainer.nodeType == Node.PROCESSING_INSTRUCTION_NODE
             || range.startContainer.nodeType == Node.COMMENT_NODE
-            || (range.startContainer.nodeType == Node.TEXT_NODE
+            || (isText(range.startContainer)
                 && !range.startContainer.parentNode)
             || range.startContainer == node) {
                     return "HIERARCHY_REQUEST_ERR";
@@ -843,7 +849,7 @@ function myInsertNode(range, node) {
     var referenceNode = null;
 
     // "If range's start node is a Text node, set referenceNode to that Text node."
-    if (range.startContainer.nodeType == Node.TEXT_NODE) {
+    if (isText(range.startContainer)) {
         referenceNode = range.startContainer;
 
         // "Otherwise, set referenceNode to the child of start node whose index is
@@ -870,7 +876,7 @@ function myInsertNode(range, node) {
 
     // "If range's start node is a Text node, set referenceNode to the result
     // of splitting it with offset range's start offset."
-    if (range.startContainer.nodeType == Node.TEXT_NODE) {
+    if (isText(range.startContainer)) {
         referenceNode = range.startContainer.splitText(range.startOffset);
     }
 
@@ -911,7 +917,7 @@ function isElement(node) {
 }
 
 function isText(node) {
-    return node.nodeType == Node.TEXT_NODE;
+    return node.nodeType == Node.TEXT_NODE || node.nodeType == Node.CDATA_SECTION_NODE;
 }
 
 function isDoctype(node) {
@@ -941,12 +947,12 @@ function ensurePreInsertionValidity(node, parent_, child) {
         return "NOT_FOUND_ERR";
     }
 
-    // "If node is not a DocumentFragment, DocumentType, Element, Text,
-    // ProcessingInstruction, or Comment node, throw a HierarchyRequestError."
+    // "If node is not a DocumentFragment, DocumentType, Element, or CharacterData node,
+    // then throw a HierarchyRequestError."
     if (node.nodeType != Node.DOCUMENT_FRAGMENT_NODE
             && node.nodeType != Node.DOCUMENT_TYPE_NODE
             && node.nodeType != Node.ELEMENT_NODE
-            && node.nodeType != Node.TEXT_NODE
+            && !isText(node)
             && node.nodeType != Node.PROCESSING_INSTRUCTION_NODE
             && node.nodeType != Node.COMMENT_NODE) {
                 return "HIERARCHY_REQUEST_ERR";
@@ -954,7 +960,7 @@ function ensurePreInsertionValidity(node, parent_, child) {
 
     // "If either node is a Text node and parent is a document, or node is a
     // doctype and parent is not a document, throw a HierarchyRequestError."
-    if ((node.nodeType == Node.TEXT_NODE
+    if ((isText(node)
                 && parent_.nodeType == Node.DOCUMENT_NODE)
             || (node.nodeType == Node.DOCUMENT_TYPE_NODE
                 && parent_.nodeType != Node.DOCUMENT_NODE)) {
diff --git a/tests/wpt/tests/dom/nodes/Node-properties.html b/tests/wpt/tests/dom/nodes/Node-properties.html
index 10f92e7d7e8..5fc2c65a8fe 100644
--- a/tests/wpt/tests/dom/nodes/Node-properties.html
+++ b/tests/wpt/tests/dom/nodes/Node-properties.html
@@ -34,16 +34,17 @@ var expected = {
         ownerDocument: document,
         parentNode: document.body,
         parentElement: document.body,
-        "childNodes.length": 6,
+        "childNodes.length": 7,
         "childNodes[0]": paras[0],
         "childNodes[1]": paras[1],
         "childNodes[2]": paras[2],
         "childNodes[3]": paras[3],
         "childNodes[4]": paras[4],
-        "childNodes[5]": comment,
+        "childNodes[5]": paras[5],
+        "childNodes[6]": comment,
         previousSibling: null,
         nextSibling: document.getElementById("log"),
-        textContent: "A\u0308b\u0308c\u0308d\u0308e\u0308f\u0308g\u0308h\u0308\nIjklmnop\nQrstuvwxYzabcdefGhijklmn",
+        textContent: "A\u0308b\u0308c\u0308d\u0308e\u0308f\u0308g\u0308h\u0308\nIjklmnop\nQrstuvwxYzabcdefGhijklmn123456789012",
 
         // Element
         namespaceURI: "http://www.w3.org/1999/xhtml",
@@ -56,10 +57,11 @@ var expected = {
         "children[2]": paras[2],
         "children[3]": paras[3],
         "children[4]": paras[4],
+        "children[5]": paras[5],
         previousElementSibling: null,
         // nextSibling isn't explicitly set
         //nextElementSibling: ,
-        childElementCount: 5,
+        childElementCount: 6,
     },
     detachedDiv: {
         // Node
@@ -351,7 +353,7 @@ var expected = {
         ownerDocument: document,
         parentNode: testDiv,
         parentElement: testDiv,
-        previousSibling: paras[4],
+        previousSibling: paras[5],
         nextSibling: null,
         nodeValue: "Alphabet soup?",
     },
@@ -557,7 +559,7 @@ var expected = {
         parentElement: testDiv,
         "childNodes.length": 1,
         previousSibling: paras[3],
-        nextSibling: comment,
+        nextSibling: paras[5],
         textContent: "Ghijklmn",
 
         // Element
@@ -567,9 +569,29 @@ var expected = {
         tagName: "P",
         id: "e",
         previousElementSibling: paras[3],
-        nextElementSibling: null,
+        nextElementSibling: paras[5],
         childElementCount: 0,
     },
+    "paras[5]": {
+        // Node
+        nodeType: Node.ELEMENT_NODE,
+        ownerDocument: document,
+        parentNode: testDiv,
+        parentElement: testDiv,
+        "childNodes.length": 3,
+        previousSibling: paras[4],
+        nextSibling: comment,
+        textContent: "123456789012",
+
+        // Element
+        namespaceURI: "http://www.w3.org/1999/xhtml",
+        prefix: null,
+        localName: "p",
+        tagName: "P",
+        previousElementSibling: paras[4],
+        nextElementSibling: null,
+        childElementCount: 0,
+    }
 };
 
 for (var node in expected) {
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-forEach.any.js b/tests/wpt/tests/dom/observable/tentative/observable-forEach.any.js
new file mode 100644
index 00000000000..d0948b295e8
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-forEach.any.js
@@ -0,0 +1,184 @@
+promise_test(async (t) => {
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const results = [];
+
+  const completion = source.forEach((value) => {
+    results.push(value);
+  });
+
+  assert_array_equals(results, [1, 2, 3]);
+  await completion;
+}, "forEach(): Visitor callback called synchronously for each value");
+
+promise_test(async (t) => {
+  const error = new Error("error");
+  const source = new Observable((subscriber) => {
+    throw error;
+  });
+
+  try {
+    await source.forEach(() => {
+      assert_unreached("Visitor callback is not invoked when Observable errors");
+    });
+    assert_unreached("forEach() promise does not resolve when Observable errors");
+  } catch (e) {
+    assert_equals(e, error);
+  }
+}, "Errors thrown by Observable reject the returned promise");
+
+promise_test(async (t) => {
+  const error = new Error("error");
+  const source = new Observable((subscriber) => {
+    subscriber.error(error);
+  });
+
+  try {
+    await source.forEach(() => {
+      assert_unreached("Visitor callback is not invoked when Observable errors");
+    });
+    assert_unreached("forEach() promise does not resolve when Observable errors");
+  } catch (reason) {
+    assert_equals(reason, error);
+  }
+}, "Errors pushed by Observable reject the returned promise");
+
+promise_test(async (t) => {
+  // This will be assigned when `source`'s teardown is called during
+  // unsubscription.
+  let abortReason = null;
+
+  const error = new Error("error");
+  const source = new Observable((subscriber) => {
+    // Should be called from within the second `next()` call below, when the
+    // `forEach()` visitor callback throws an error, because that triggers
+    // unsubscription from `source`.
+    subscriber.addTeardown(() => abortReason = subscriber.signal.reason);
+
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const results = [];
+
+  const completion = source.forEach((value) => {
+    results.push(value);
+    if (value === 2) {
+      throw error;
+    }
+  });
+
+  assert_array_equals(results, [1, 2]);
+  assert_equals(abortReason, error,
+      "forEach() visitor callback throwing an error triggers unsubscription " +
+      "from the source observable, with the correct abort reason");
+
+  try {
+    await completion;
+    assert_unreached("forEach() promise does not resolve when visitor throws");
+  } catch (e) {
+    assert_equals(e, error);
+  }
+}, "Errors thrown in the visitor callback reject the promise and " +
+   "unsubscribe from the source");
+
+// See https://github.com/WICG/observable/issues/96 for discussion about the
+// timing of Observable AbortSignal `abort` firing and promise rejection.
+promise_test(async t => {
+  const error = new Error('custom error');
+  let rejectionError = null;
+  let outerAbortEventMicrotaskRun = false,
+      forEachPromiseRejectionMicrotaskRun = false,
+      innerAbortEventMicrotaskRun = false;
+
+  const source = new Observable(subscriber => {
+    subscriber.signal.addEventListener('abort', () => {
+      queueMicrotask(() => {
+        assert_true(outerAbortEventMicrotaskRun,
+            "Inner abort: outer abort microtask has fired");
+        assert_true(forEachPromiseRejectionMicrotaskRun,
+            "Inner abort: forEach rejection microtask has fired");
+        assert_false(innerAbortEventMicrotaskRun,
+            "Inner abort: inner abort microtask has not fired");
+
+        innerAbortEventMicrotaskRun = true;
+      });
+    });
+  });
+
+  const controller = new AbortController();
+  controller.signal.addEventListener('abort', () => {
+    queueMicrotask(() => {
+      assert_false(outerAbortEventMicrotaskRun,
+          "Outer abort: outer abort microtask has not fired");
+      assert_false(forEachPromiseRejectionMicrotaskRun,
+          "Outer abort: forEach rejection microtask has not fired");
+      assert_false(innerAbortEventMicrotaskRun,
+          "Outer abort: inner abort microtask has not fired");
+
+      outerAbortEventMicrotaskRun = true;
+    });
+  });
+
+  const promise = source.forEach(() => {}, {signal: controller.signal}).catch(e => {
+    rejectionError = e;
+    assert_true(outerAbortEventMicrotaskRun,
+        "Promise rejection: outer abort microtask has fired");
+    assert_false(forEachPromiseRejectionMicrotaskRun,
+        "Promise rejection: forEach rejection microtask has not fired");
+    assert_false(innerAbortEventMicrotaskRun,
+        "Promise rejection: inner abort microtask has not fired");
+
+    forEachPromiseRejectionMicrotaskRun = true;
+  });
+
+  // This should trigger the following, in this order:
+  //   1. Fire the `abort` event at the outer AbortSignal, whose handler
+  //      manually queues a microtask.
+  //   2. Calls "signal abort" on the outer signal's dependent signals. This
+  //      queues a microtask to reject the `forEach()` promise.
+  //   3. Fire the `abort` event at the inner AbortSignal, whose handler
+  //      manually queues a microtask.
+  controller.abort(error);
+
+  // After a single task, assert that everything has happened correctly (and
+  // incrementally in the right order);
+  await new Promise(resolve => {
+    t.step_timeout(resolve);
+  });
+  assert_true(outerAbortEventMicrotaskRun,
+      "Final: outer abort microtask has fired");
+  assert_true(forEachPromiseRejectionMicrotaskRun,
+      "Final: forEach rejection microtask has fired");
+  assert_true(innerAbortEventMicrotaskRun,
+      "Final: inner abort microtask has fired");
+  assert_equals(rejectionError, error, "Promise is rejected with the right " +
+      "value");
+}, "forEach visitor callback rejection microtask ordering");
+
+promise_test(async (t) => {
+  const source = new Observable((subscriber) => {
+    subscriber.next(1);
+    subscriber.next(2);
+    subscriber.next(3);
+    subscriber.complete();
+  });
+
+  const results = [];
+
+  const completion = source.forEach((value) => {
+    results.push(value);
+  });
+
+  assert_array_equals(results, [1, 2, 3]);
+
+  const completionValue = await completion;
+  assert_equals(completionValue, undefined, "Promise resolves with undefined");
+}, "forEach() promise resolves with undefined");
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-forEach.window.js b/tests/wpt/tests/dom/observable/tentative/observable-forEach.window.js
new file mode 100644
index 00000000000..71c2e173039
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-forEach.window.js
@@ -0,0 +1,59 @@
+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;
+}
+
+promise_test(async t => {
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  window.results = [];
+
+  contentWin.eval(`
+    const parentResults = parent.results;
+
+    const source = new Observable(subscriber => {
+      window.frameElement.remove();
+
+      // This invokes the forEach() operator's internal observer's next steps,
+      // which at least in Chromium, must have a special "context is detached"
+      // check to early-return, so as to not crash.
+      subscriber.next(1);
+    });
+
+    source.forEach(value => {
+      parentResults.push(value);
+    });
+  `);
+
+  // If we got here, we didn't crash! Let's also check that `results` is empty.
+  assert_array_equals(results, []);
+}, "forEach()'s internal observer's next steps do not crash in a detached document");
+
+promise_test(async t => {
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  window.results = [];
+
+  contentWin.eval(`
+    const parentResults = parent.results;
+
+    const source = new Observable(subscriber => {
+      subscriber.next(1);
+    });
+
+    source.forEach(value => {
+      window.frameElement.remove();
+      parentResults.push(value);
+    });
+  `);
+
+  assert_array_equals(results, [1]);
+}, "forEach()'s internal observer's next steps do not crash when visitor " +
+   "callback detaches the document");
diff --git a/tests/wpt/tests/dom/ranges/Range-cloneContents.html b/tests/wpt/tests/dom/ranges/Range-cloneContents.html
index 6064151f62d..92d8c0f9d2e 100644
--- a/tests/wpt/tests/dom/ranges/Range-cloneContents.html
+++ b/tests/wpt/tests/dom/ranges/Range-cloneContents.html
@@ -48,7 +48,7 @@ function myCloneContents(range) {
   // "If original start node and original end node are the same, and they are
   // a Text, ProcessingInstruction, or Comment node:"
   if (range.startContainer == range.endContainer
-  && (range.startContainer.nodeType == Node.TEXT_NODE
+  && (isText(range.startContainer)
   || range.startContainer.nodeType == Node.COMMENT_NODE
   || range.startContainer.nodeType == Node.PROCESSING_INSTRUCTION_NODE)) {
     // "Let clone be the result of calling cloneNode(false) on original
@@ -133,7 +133,7 @@ function myCloneContents(range) {
 
   // "If first partially contained child is a Text, ProcessingInstruction, or Comment node:"
   if (firstPartiallyContainedChild
-  && (firstPartiallyContainedChild.nodeType == Node.TEXT_NODE
+  && (isText(firstPartiallyContainedChild)
   || firstPartiallyContainedChild.nodeType == Node.COMMENT_NODE
   || firstPartiallyContainedChild.nodeType == Node.PROCESSING_INSTRUCTION_NODE)) {
     // "Let clone be the result of calling cloneNode(false) on original
@@ -189,7 +189,7 @@ function myCloneContents(range) {
 
   // "If last partially contained child is a Text, ProcessingInstruction, or Comment node:"
   if (lastPartiallyContainedChild
-  && (lastPartiallyContainedChild.nodeType == Node.TEXT_NODE
+  && (isText(lastPartiallyContainedChild)
   || lastPartiallyContainedChild.nodeType == Node.COMMENT_NODE
   || lastPartiallyContainedChild.nodeType == Node.PROCESSING_INSTRUCTION_NODE)) {
     // "Let clone be the result of calling cloneNode(false) on original
diff --git a/tests/wpt/tests/dom/ranges/Range-deleteContents.html b/tests/wpt/tests/dom/ranges/Range-deleteContents.html
index 40dc4001250..6f695ae7bf9 100644
--- a/tests/wpt/tests/dom/ranges/Range-deleteContents.html
+++ b/tests/wpt/tests/dom/ranges/Range-deleteContents.html
@@ -72,7 +72,7 @@ function myDeleteContents(range) {
   // offset minus original start offset, and data the empty string, and then
   // terminate these steps"
   if (originalStartNode == originalEndNode
-  && (range.startContainer.nodeType == Node.TEXT_NODE
+  && (isText(range.startContainer)
   || range.startContainer.nodeType == Node.PROCESSING_INSTRUCTION_NODE
   || range.startContainer.nodeType == Node.COMMENT_NODE)) {
     originalStartNode.deleteData(originalStartOffset, originalEndOffset - originalStartOffset);
@@ -126,7 +126,7 @@ function myDeleteContents(range) {
   // replace data with node original start node, offset original start offset,
   // count original start node's length minus original start offset, data the
   // empty start"
-  if (originalStartNode.nodeType == Node.TEXT_NODE
+  if (isText(originalStartNode)
   || originalStartNode.nodeType == Node.PROCESSING_INSTRUCTION_NODE
   || originalStartNode.nodeType == Node.COMMENT_NODE) {
     originalStartNode.deleteData(originalStartOffset, nodeLength(originalStartNode) - originalStartOffset);
@@ -141,7 +141,7 @@ function myDeleteContents(range) {
   // "If original end node is a Text, ProcessingInstruction, or Comment node,
   // replace data with node original end node, offset 0, count original end
   // offset, and data the empty string."
-  if (originalEndNode.nodeType == Node.TEXT_NODE
+  if (isText(originalEndNode)
   || originalEndNode.nodeType == Node.PROCESSING_INSTRUCTION_NODE
   || originalEndNode.nodeType == Node.COMMENT_NODE) {
     originalEndNode.deleteData(0, originalEndOffset);
diff --git a/tests/wpt/tests/dom/ranges/Range-surroundContents.html b/tests/wpt/tests/dom/ranges/Range-surroundContents.html
index c9d47fcbad0..a656db00491 100644
--- a/tests/wpt/tests/dom/ranges/Range-surroundContents.html
+++ b/tests/wpt/tests/dom/ranges/Range-surroundContents.html
@@ -22,7 +22,7 @@ function mySurroundContents(range, newParent) {
     var node = range.commonAncestorContainer;
     var stop = nextNodeDescendants(node);
     for (; node != stop; node = nextNode(node)) {
-      if (node.nodeType != Node.TEXT_NODE
+      if (!isText(node)
       && isPartiallyContained(node, range)) {
         return "INVALID_STATE_ERR";
       }
diff --git a/tests/wpt/tests/editing/edit-context/edit-context-input.tentative.html b/tests/wpt/tests/editing/edit-context/edit-context-input.tentative.html
index 3a65ab996cb..762ec595475 100644
--- a/tests/wpt/tests/editing/edit-context/edit-context-input.tentative.html
+++ b/tests/wpt/tests/editing/edit-context/edit-context-input.tentative.html
@@ -13,56 +13,69 @@
       const kBackspaceKey = "\uE003";
       const kDeleteKey = "\uE017";
 
-    promise_test(async function() {
+    async function testBasicTestInput(element) {
       const editContext = new EditContext();
-      const div = document.createElement("div");
-      document.body.appendChild(div);
+      let textForView = "";
+      document.body.appendChild(element);
       let beforeInputType = null;
       let beforeInputTargetRanges = null;
-      div.addEventListener("beforeinput", e => {
+      element.addEventListener("beforeinput", e => {
         beforeInputType = e.inputType;
         beforeInputTargetRanges = e.getTargetRanges().map(
           staticRange => [staticRange.startOffset, staticRange.endOffset]);
       });
       editContext.addEventListener("textupdate", e => {
-        div.innerHTML = `${div.innerHTML.substring(0, e.updateRangeStart)}${e.text}${div.innerHTML.substring(e.updateRangeEnd)}`;
+        textForView = `${textForView.substring(0, e.updateRangeStart)}${e.text}${textForView.substring(e.updateRangeEnd)}`;
       });
-      div.editContext = editContext;
-      div.focus();
-      await test_driver.send_keys(div, 'a');
+      element.editContext = editContext;
+      element.focus();
+      await test_driver.send_keys(element, 'a');
       assert_equals(editContext.text, "a");
-      assert_equals(div.innerHTML, "a");
+      assert_equals(textForView, "a");
       assert_equals(beforeInputType, "insertText");
-      assert_equals(beforeInputTargetRanges.length, 1);
-      assert_array_equals(beforeInputTargetRanges[0], [0, 0]);
-      div.remove();
-    }, 'Testing EditContext English typing');
+      if (element instanceof HTMLCanvasElement) {
+        // DOM selection doesn't work inside <canvas>, so events
+        // in <canvas> can't have target ranges.
+        assert_equals(beforeInputTargetRanges.length, 0);
+      } else {
+        assert_equals(beforeInputTargetRanges.length, 1);
+        assert_array_equals(beforeInputTargetRanges[0], [0, 0]);
+      }
 
-    promise_test(async function() {
+      element.remove();
+    }
+
+    promise_test(testBasicTestInput.bind(null, document.createElement("div")), "Basic text input with div");
+    promise_test(testBasicTestInput.bind(null, document.createElement("canvas")), "Basic text input with canvas");
+
+    async function testBasicTestInputWithExistingSelection(element) {
       const editContext = new EditContext();
-      const div = document.createElement("div");
-      document.body.appendChild(div);
+      let textForView = "";
+      document.body.appendChild(element);
       editContext.addEventListener("textupdate", e => {
-        div.innerHTML = `${div.innerHTML.substring(0, e.updateRangeStart)}${e.text}${div.innerHTML.substring(e.updateRangeEnd)}`;
+        textForView = `${textForView.substring(0, e.updateRangeStart)}${e.text}${textForView.substring(e.updateRangeEnd)}`;
       });
-      div.editContext = editContext;
-      div.focus();
+      element.editContext = editContext;
+      element.focus();
 
       editContext.updateText(0, 0, "abcd");
-      div.innerText = "abcd";
+      textForView = "abcd";
       assert_equals(editContext.text, "abcd");
       editContext.updateSelection(2, 3);
-      await test_driver.send_keys(div, 'Z');
+      await test_driver.send_keys(element, 'Z');
       assert_equals(editContext.text, "abZd");
-      assert_equals(div.innerHTML, "abZd");
+      assert_equals(textForView, "abZd");
 
       editContext.updateSelection(2, 1);
-      await test_driver.send_keys(div, 'Y');
+      await test_driver.send_keys(element, 'Y');
       assert_equals(editContext.text, "aYZd");
-      assert_equals(div.innerHTML, "aYZd");
+      assert_equals(textForView, "aYZd");
 
-      div.remove();
-    }, 'Text insertion with non-collapsed selection');
+      element.remove();
+    }
+
+    promise_test(testBasicTestInputWithExistingSelection.bind(null, document.createElement("div")), "Text insertion with non-collapsed selection with div");
+    promise_test(testBasicTestInputWithExistingSelection.bind(null, document.createElement("canvas")), "Text insertion with non-collapsed selection with canvas");
 
     promise_test(async function() {
       const editContext = new EditContext();
@@ -118,14 +131,13 @@
     div.remove();
   }, "EditContext should not receive events after being detached from element");
 
-  promise_test(async function() {
+  async function testBackspaceAndDelete(element) {
       const editContext = new EditContext();
-      const div = document.createElement("div");
-      div.innerText = "hello there";
-      document.body.appendChild(div);
+      let textForView = "hello there";
+      document.body.appendChild(element);
       let beforeInputType = null;
       let beforeInputTargetRanges = null;
-      div.addEventListener("beforeinput", e => {
+      element.addEventListener("beforeinput", e => {
         beforeInputType = e.inputType;
         beforeInputTargetRanges = e.getTargetRanges().map(
           staticRange => [staticRange.startOffset, staticRange.endOffset]);
@@ -133,35 +145,37 @@
       let textUpdateSelection = null;
       editContext.addEventListener("textupdate", e => {
         textUpdateSelection = [e.selectionStart, e.selectionEnd];
-        div.innerText = `${div.innerText.substring(0, e.updateRangeStart)}${e.text}${div.innerText.substring(e.updateRangeEnd)}`;
+        textForView = `${textForView.substring(0, e.updateRangeStart)}${e.text}${textForView.substring(e.updateRangeEnd)}`;
       });
-      div.editContext = editContext;
+      element.editContext = editContext;
       editContext.updateText(0, 11, "hello there");
       editContext.updateSelection(10, 10);
       const selection = window.getSelection();
-      selection.setBaseAndExtent(div.firstChild, 10, div.firstChild, 10);
 
-      await test_driver.send_keys(div, kBackspaceKey);
-      assert_equals(div.innerHTML, "hello thee");
+      await test_driver.send_keys(element, kBackspaceKey);
+      assert_equals(textForView, "hello thee");
       assert_array_equals(textUpdateSelection, [9, 9]);
       assert_equals(beforeInputType, "deleteContentBackward");
       assert_equals(beforeInputTargetRanges.length, 0, "Backspace should not have a target range in EditContext");
 
-      await test_driver.send_keys(div, kDeleteKey);
-      assert_equals(div.innerHTML, "hello the");
+      await test_driver.send_keys(element, kDeleteKey);
+      assert_equals(textForView, "hello the");
       assert_array_equals(textUpdateSelection, [9, 9]);
       assert_equals(beforeInputType, "deleteContentForward");
       assert_equals(beforeInputTargetRanges.length, 0, "Delete should not have a target range in EditContext");
-      div.remove();
-    }, "Backspace and delete in EditContext");
+      element.remove();
+    }
 
-    promise_test(async function() {
+    promise_test(testBackspaceAndDelete.bind(null, document.createElement("div")), "Backspace and delete in EditContext with div");
+    promise_test(testBackspaceAndDelete.bind(null, document.createElement("canvas")) , "Backspace and delete in EditContext with canvas");
+
+    async function testBackspaceAndDeleteWithExistingSelection(element) {
       const editContext = new EditContext();
-      const div = document.createElement("div");
-      document.body.appendChild(div);
+      let textForView = "hello there";
+      document.body.appendChild(element);
       let beforeInputType = null;
       let beforeInputTargetRanges = null;
-      div.addEventListener("beforeinput", e => {
+      element.addEventListener("beforeinput", e => {
         beforeInputType = e.inputType;
         beforeInputTargetRanges = e.getTargetRanges().map(
           staticRange => [staticRange.startOffset, staticRange.endOffset]);
@@ -169,48 +183,51 @@
       let textUpdateSelection = null;
       editContext.addEventListener("textupdate", e => {
         textUpdateSelection = [e.selectionStart, e.selectionEnd];
-        div.innerText = `${div.innerText.substring(0, e.updateRangeStart)}${e.text}${div.innerText.substring(e.updateRangeEnd)}`;
+        textForView = `${textForView.substring(0, e.updateRangeStart)}${e.text}${textForView.substring(e.updateRangeEnd)}`;
       });
-      div.editContext = editContext;
+      element.editContext = editContext;
       const initialText = "abcdefghijklmnopqrstuvwxyz";
       editContext.updateText(0, initialText.length, initialText);
-      div.innerText = initialText;
-      div.focus();
+      textForView = initialText;
+      element.focus();
 
       editContext.updateSelection(3, 6);
-      await test_driver.send_keys(div, kBackspaceKey);
+      await test_driver.send_keys(element, kBackspaceKey);
       assert_equals(editContext.text, "abcghijklmnopqrstuvwxyz");
-      assert_equals(div.innerHTML, "abcghijklmnopqrstuvwxyz");
+      assert_equals(textForView, "abcghijklmnopqrstuvwxyz");
       assert_array_equals(textUpdateSelection, [3, 3]);
       assert_equals(beforeInputType, "deleteContentBackward");
       assert_equals(beforeInputTargetRanges.length, 0, "Backspace should not have a target range in EditContext");
 
       editContext.updateSelection(3, 6);
-      await test_driver.send_keys(div, kDeleteKey);
+      await test_driver.send_keys(element, kDeleteKey);
       assert_equals(editContext.text, "abcjklmnopqrstuvwxyz");
-      assert_equals(div.innerHTML, "abcjklmnopqrstuvwxyz");
+      assert_equals(textForView, "abcjklmnopqrstuvwxyz");
       assert_array_equals(textUpdateSelection, [3, 3]);
       assert_equals(beforeInputType, "deleteContentForward");
       assert_equals(beforeInputTargetRanges.length, 0, "Delete should not have a target range in EditContext");
 
       editContext.updateSelection(6, 3);
-      await test_driver.send_keys(div, kBackspaceKey);
+      await test_driver.send_keys(element, kBackspaceKey);
       assert_equals(editContext.text, "abcmnopqrstuvwxyz");
-      assert_equals(div.innerHTML, "abcmnopqrstuvwxyz");
+      assert_equals(textForView, "abcmnopqrstuvwxyz");
       assert_array_equals(textUpdateSelection, [3, 3]);
       assert_equals(beforeInputType, "deleteContentBackward");
       assert_equals(beforeInputTargetRanges.length, 0, "Backspace should not have a target range in EditContext");
 
       editContext.updateSelection(6, 3);
-      await test_driver.send_keys(div, kDeleteKey);
+      await test_driver.send_keys(element, kDeleteKey);
       assert_equals(editContext.text, "abcpqrstuvwxyz");
-      assert_equals(div.innerHTML, "abcpqrstuvwxyz");
+      assert_equals(textForView, "abcpqrstuvwxyz");
       assert_array_equals(textUpdateSelection, [3, 3]);
       assert_equals(beforeInputType, "deleteContentForward");
       assert_equals(beforeInputTargetRanges.length, 0, "Delete should not have a target range in EditContext");
 
-      div.remove();
-    }, "Backspace and delete with existing selection");
+      element.remove();
+    }
+
+    promise_test(testBackspaceAndDeleteWithExistingSelection.bind(null, document.createElement("div")), "Backspace and delete with existing selection with div");
+    promise_test(testBackspaceAndDeleteWithExistingSelection.bind(null, document.createElement("canvas")) , "Backspace and delete with existing selection with canvas");
 
     promise_test(async function() {
       const iframe = document.createElement("iframe");
diff --git a/tests/wpt/tests/fenced-frame/get-nested-configs.https.html b/tests/wpt/tests/fenced-frame/get-nested-configs.https.html
index da77f94a763..2876e52d148 100644
--- a/tests/wpt/tests/fenced-frame/get-nested-configs.https.html
+++ b/tests/wpt/tests/fenced-frame/get-nested-configs.https.html
@@ -17,7 +17,7 @@ promise_test(async (t) => {
   const response = await nextValueFromServer(key);
   const [length] = response.split(",");
 
-  assert_equals(length, '20', 'There should be 20 nested configurations.');
+  assert_equals(length, '40', 'There should be 40 nested configurations.');
 }, 'getNestedConfigs() created by FLEDGE should return configurations');
 
 for (const resolve_to_config of [true, false]) {
@@ -57,7 +57,7 @@ promise_test(async (t) => {
   const response = await nextValueFromServer(key);
   const [length, first_url] = response.split(",");
 
-  assert_equals(length, '20', 'There should be 20 nested configurations.');
+  assert_equals(length, '40', 'There should be 40 nested configurations.');
 }, 'getNestedConfigs() should work in a same-origin nested iframe');
 
 promise_test(async (t) => {
diff --git a/tests/wpt/tests/fetch/api/request/request-constructor-init-body-override.any.js b/tests/wpt/tests/fetch/api/request/request-constructor-init-body-override.any.js
new file mode 100644
index 00000000000..27bb991871a
--- /dev/null
+++ b/tests/wpt/tests/fetch/api/request/request-constructor-init-body-override.any.js
@@ -0,0 +1,21 @@
+promise_test(async function () {
+    const req1 = new Request("https://example.com/", {
+        body: "req1",
+        method: "POST",
+    });
+
+    const text1 = await req1.text();
+    assert_equals(
+        text1,
+        "req1",
+        "The body of the first request should be 'req1'."
+    );
+
+    const req2 = new Request(req1, { body: "req2" });
+    const bodyText = await req2.text();
+    assert_equals(
+        bodyText,
+        "req2",
+        "The body of the second request should be overridden to 'req2'."
+    );
+}, "Check that the body of a new request can be overridden when created from an existing Request object");
diff --git a/tests/wpt/tests/fetch/content-encoding/bad-gzip-body.any.js b/tests/wpt/tests/fetch/content-encoding/gzip/bad-gzip-body.any.js
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/bad-gzip-body.any.js
rename to tests/wpt/tests/fetch/content-encoding/gzip/bad-gzip-body.any.js
diff --git a/tests/wpt/tests/fetch/content-encoding/big-gzip-body.https.any.js b/tests/wpt/tests/fetch/content-encoding/gzip/big-gzip-body.https.any.js
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/big-gzip-body.https.any.js
rename to tests/wpt/tests/fetch/content-encoding/gzip/big-gzip-body.https.any.js
diff --git a/tests/wpt/tests/fetch/content-encoding/gzip-body.any.js b/tests/wpt/tests/fetch/content-encoding/gzip/gzip-body.any.js
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/gzip-body.any.js
rename to tests/wpt/tests/fetch/content-encoding/gzip/gzip-body.any.js
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/bad-gzip-body.py b/tests/wpt/tests/fetch/content-encoding/gzip/resources/bad-gzip-body.py
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/bad-gzip-body.py
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/bad-gzip-body.py
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/big.text.gz b/tests/wpt/tests/fetch/content-encoding/gzip/resources/big.text.gz
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/big.text.gz
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/big.text.gz
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/big.text.gz.headers b/tests/wpt/tests/fetch/content-encoding/gzip/resources/big.text.gz.headers
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/big.text.gz.headers
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/big.text.gz.headers
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/foo.octetstream.gz b/tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.octetstream.gz
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/foo.octetstream.gz
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.octetstream.gz
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/foo.octetstream.gz.headers b/tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.octetstream.gz.headers
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/foo.octetstream.gz.headers
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.octetstream.gz.headers
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/foo.text.gz b/tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.text.gz
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/foo.text.gz
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.text.gz
diff --git a/tests/wpt/tests/fetch/content-encoding/resources/foo.text.gz.headers b/tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.text.gz.headers
similarity index 100%
rename from tests/wpt/tests/fetch/content-encoding/resources/foo.text.gz.headers
rename to tests/wpt/tests/fetch/content-encoding/gzip/resources/foo.text.gz.headers
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/bad-zstd-body.https.any.js b/tests/wpt/tests/fetch/content-encoding/zstd/bad-zstd-body.https.any.js
new file mode 100644
index 00000000000..3f32e4dfba7
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/bad-zstd-body.https.any.js
@@ -0,0 +1,22 @@
+// META: global=window,worker
+
+promise_test((test) => {
+    return fetch("resources/bad-zstd-body.py").then(res => {
+      assert_equals(res.status, 200);
+    });
+}, "Fetching a resource with bad zstd content should still resolve");
+
+[
+  "arrayBuffer",
+  "blob",
+  "formData",
+  "json",
+  "text"
+].forEach(method => {
+  promise_test(t => {
+    return fetch("resources/bad-zstd-body.py").then(res => {
+      assert_equals(res.status, 200);
+      return promise_rejects_js(t, TypeError, res[method]());
+    });
+  }, "Consuming the body of a resource with bad zstd content with " + method + "() should reject");
+});
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js b/tests/wpt/tests/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js
new file mode 100644
index 00000000000..c1dc9449567
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/big-window-zstd-body.tentative.https.any.js
@@ -0,0 +1,9 @@
+// META: global=window,worker
+// See https://github.com/facebook/zstd/issues/2713 for discussion about
+// standardizing window size limits.
+
+promise_test(async t => {
+  const response = await fetch('resources/big.window.zst');
+  assert_true(response.ok);
+  await promise_rejects_js(t, TypeError, response.text());
+}, 'Consuming the body of a resource with too large of a zstd window size should reject');
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/big-zstd-body.https.any.js b/tests/wpt/tests/fetch/content-encoding/zstd/big-zstd-body.https.any.js
new file mode 100644
index 00000000000..6835f6e4255
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/big-zstd-body.https.any.js
@@ -0,0 +1,55 @@
+// META: global=window,worker
+
+const EXPECTED_SIZE = 27000000;
+const EXPECTED_SHA256 = [
+    74,  100, 37, 243, 147, 61,  116, 60,  241, 221, 126,
+    18,  24,  71, 204, 28,  50,  62,  201, 130, 152, 225,
+    217, 183, 10, 201, 143, 214, 102, 155, 212, 248,
+  ];
+
+promise_test(async () => {
+  const response = await fetch('resources/big.text.zst');
+  assert_true(response.ok);
+  const arrayBuffer = await response.arrayBuffer();
+  assert_equals(arrayBuffer.byteLength, EXPECTED_SIZE,
+               'uncompressed size should match');
+  const sha256 = await crypto.subtle.digest('SHA-256', arrayBuffer);
+  assert_array_equals(new Uint8Array(sha256), EXPECTED_SHA256,
+                      'digest should match');
+}, 'large zstd data should be decompressed successfully');
+
+promise_test(async () => {
+  const response = await fetch('resources/big.text.zst');
+  assert_true(response.ok);
+  const reader = response.body.getReader({mode: 'byob'});
+  let offset = 0;
+  // Pre-allocate space for the output. The response body will be read
+  // chunk-by-chunk into this array.
+  let ab = new ArrayBuffer(EXPECTED_SIZE);
+  while (offset < EXPECTED_SIZE) {
+    // To stress the data pipe, we want to use a different size read each
+    // time. Unfortunately, JavaScript doesn't have a seeded random number
+    // generator, so this creates the possibility of making this test flaky if
+    // it doesn't work for some edge cases.
+    let size = Math.floor(Math.random() * 65535 + 1);
+    if (size + offset > EXPECTED_SIZE) {
+      size = EXPECTED_SIZE - offset;
+    }
+    const u8 = new Uint8Array(ab, offset, size);
+    const { value, done } = await reader.read(u8);
+    ab = value.buffer;
+    // Check that we got our original array back.
+    assert_equals(ab.byteLength, EXPECTED_SIZE,
+                  'backing array should be the same size');
+    assert_equals(offset, value.byteOffset, 'offset should match');
+    assert_less_than_equal(value.byteLength, size,
+                           'we should not have got more than we asked for');
+    offset = value.byteOffset + value.byteLength;
+    if (done) break;
+  }
+  assert_equals(offset, EXPECTED_SIZE,
+                'we should have read the whole thing');
+  const sha256 = await crypto.subtle.digest('SHA-256', new Uint8Array(ab));
+  assert_array_equals(new Uint8Array(sha256), EXPECTED_SHA256,
+                      'digest should match');
+}, 'large zstd data should be decompressed successfully with byte stream');
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/bad-zstd-body.py b/tests/wpt/tests/fetch/content-encoding/zstd/resources/bad-zstd-body.py
new file mode 100644
index 00000000000..496f26881dc
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/resources/bad-zstd-body.py
@@ -0,0 +1,3 @@
+def main(request, response):
+    headers = [(b"Content-Encoding", b"zstd")]
+    return headers, b"not actually zstd"
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst
new file mode 100644
index 0000000000000000000000000000000000000000..30eda2443f338240772315f18ca29f607cc6e395
GIT binary patch
literal 2509
zcmdPcs{gko;=rHTj53T2HxiSQQ&Q8?GcvQXb8_?Y3kr*hOG?YiD=MqF7#X_%SKA%;
zVPN3MXJq*E-%@}H#7;tD7a*~dk=TVu>=Yz+5fVEUiCv7uPD5gsAhFYt*riD93?z0L
z5<3%#U5>=gLSk1Sv9pobl}PLyBz6@NI~R!!3@do}<RP&Wk=UbQ2uVLfAq-s@7#J8C
z{{ElmuK-H&qsb5wb)#7s5)Q*XE2Aa<(b5nS?V~jcBpil&afp`u2UEkw7g!qsli{8}
Lz{VKg_oXfXoRfkF

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst.headers b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst.headers
new file mode 100644
index 00000000000..ea5b05cf2c2
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.text.zst.headers
@@ -0,0 +1,3 @@
+Content-type: text/plain
+Content-Encoding: zstd
+Cache-Control: no-store
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst
new file mode 100644
index 0000000000000000000000000000000000000000..a1bca73228318c28640981bacaf56fcbd287070e
GIT binary patch
literal 599
zcmdPcs{eNh0|NtN3Il@x0|OJo%m3!Z4;XcrfIM<>2*^B!zyFyT6x1EaH3Xy&VUUAf
kBXtZ)pq4=s%oV8PA_HoLQ2@2PRzSW%%)nUVzVRpy0RJy1#Q*>R

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst.headers b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst.headers
new file mode 100644
index 00000000000..c5974e126a3
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/resources/big.window.zst.headers
@@ -0,0 +1,2 @@
+Content-type: text/plain
+Content-Encoding: zstd
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst
new file mode 100644
index 0000000000000000000000000000000000000000..a73bbdd22458db57635bf88e97a4e47b4886e722
GIT binary patch
literal 25
hcmdPcs{c2IMI)AhK_V?bpON98$30%g!~5pX2LNk|2}J+^

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst.headers b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst.headers
new file mode 100644
index 00000000000..e397816f545
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.octetstream.zst.headers
@@ -0,0 +1,2 @@
+Content-type: application/octet-stream
+Content-Encoding: zstd
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst
new file mode 100644
index 0000000000000000000000000000000000000000..a73bbdd22458db57635bf88e97a4e47b4886e722
GIT binary patch
literal 25
hcmdPcs{c2IMI)AhK_V?bpON98$30%g!~5pX2LNk|2}J+^

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst.headers b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst.headers
new file mode 100644
index 00000000000..c5974e126a3
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/resources/foo.text.zst.headers
@@ -0,0 +1,2 @@
+Content-type: text/plain
+Content-Encoding: zstd
diff --git a/tests/wpt/tests/fetch/content-encoding/zstd/zstd-body.https.any.js b/tests/wpt/tests/fetch/content-encoding/zstd/zstd-body.https.any.js
new file mode 100644
index 00000000000..86923857432
--- /dev/null
+++ b/tests/wpt/tests/fetch/content-encoding/zstd/zstd-body.https.any.js
@@ -0,0 +1,15 @@
+// META: global=window,worker
+
+const expectedDecompressedSize = 10500;
+[
+    "text",
+    "octetstream"
+].forEach(contentType => {
+    promise_test(async t => {
+        let response = await fetch(`resources/foo.${contentType}.zst`);
+        assert_true(response.ok);
+        let arrayBuffer = await response.arrayBuffer()
+        let u8 = new Uint8Array(arrayBuffer);
+        assert_equals(u8.length, expectedDecompressedSize);
+    }, `fetched zstd data with content type ${contentType} should be decompressed.`);
+});
diff --git a/tests/wpt/tests/fledge/tentative/component-ads.https.window.js b/tests/wpt/tests/fledge/tentative/component-ads.https.window.js
index 719a645beb6..7e98570b9ef 100644
--- a/tests/wpt/tests/fledge/tentative/component-ads.https.window.js
+++ b/tests/wpt/tests/fledge/tentative/component-ads.https.window.js
@@ -61,7 +61,7 @@ async function runComponentAdLoadingTest(test, uuid, numComponentAdsInInterestGr
       `// "status" is passed to the beacon URL, to be verified by waitForObservedRequests().
        let status = "ok";
        const componentAds = window.fence.getNestedConfigs()
-       if (componentAds.length != 20)
+       if (componentAds.length != 40)
          status = "unexpected getNestedConfigs() length";
        for (let i of ${JSON.stringify(componentAdsToLoad)}) {
          let fencedFrame = document.createElement("fencedframe");
@@ -72,8 +72,7 @@ async function runComponentAdLoadingTest(test, uuid, numComponentAdsInInterestGr
 
        window.fence.reportEvent({eventType: "beacon",
                                  eventData: status,
-                                 destination: ["buyer"]});`
-      );
+                                 destination: ["buyer"]});`);
 
   let bid = {bid:1, render: renderURL};
   if (componentAdsInBid) {
@@ -141,13 +140,11 @@ async function runComponentAdLoadingTest(test, uuid, numComponentAdsInInterestGr
 subsetTest(promise_test, async test => {
   const uuid = generateUuid(test);
 
-  const renderURL = createRenderURL(
-    uuid,
-    `let status = "ok";
+  const renderURL = createRenderURL(uuid, `let status = "ok";
      const nestedConfigsLength = window.fence.getNestedConfigs().length
-     // "getNestedConfigs()" should return a list of 20 configs, to avoid leaking
+     // "getNestedConfigs()" should return a list of 40 configs, to avoid leaking
      // whether there were any component URLs to the page.
-     if (nestedConfigsLength != 20)
+     if (nestedConfigsLength != 40)
        status = "unexpected getNestedConfigs() length: " + nestedConfigsLength;
      window.fence.reportEvent({eventType: "beacon",
                                eventData: status,
@@ -291,6 +288,18 @@ subsetTest(promise_test, async test => {
                                   /*componentAdsToLoad=*/intsUpTo19);
 }, '20 of 20 component ads in bid and then shown.');
 
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+  const intsUpTo39 = [];
+  for (let i = 0; i < 40; ++i) {
+    intsUpTo39.push(i);
+  }
+  await runComponentAdLoadingTest(
+      test, uuid, /*numComponentAdsInInterestGroup=*/ 40,
+      /*componentAdsInBid=*/ intsUpTo39,
+      /*componentAdsToLoad=*/ intsUpTo39);
+}, '40 of 40 component ads in bid and then shown.');
+
 subsetTest(promise_test, async test => {
   const uuid = generateUuid(test);
   await runComponentAdLoadingTest(test, uuid, /*numComponentAdsInInterestGroup=*/20,
@@ -330,7 +339,7 @@ subsetTest(promise_test, async test => {
 
   let adComponents = [];
   let adComponentsList = [];
-  for (let i = 0; i < 21; ++i) {
+  for (let i = 0; i < 41; ++i) {
     let componentRenderURL = createComponentAdTrackerURL(uuid, i);
     adComponents.push({renderURL: componentRenderURL});
     adComponentsList.push(componentRenderURL);
@@ -348,7 +357,7 @@ subsetTest(promise_test, async test => {
                                  adComponents: ${JSON.stringify(adComponentsList)}};`}),
             ads: [{renderURL: renderURL}],
             adComponents: adComponents}});
-}, '21 component ads not allowed in bid.');
+}, '41 component ads not allowed in bid.');
 
 subsetTest(promise_test, async test => {
   const uuid = generateUuid(test);
@@ -356,7 +365,7 @@ subsetTest(promise_test, async test => {
 
   let adComponents = [];
   let adComponentsList = [];
-  for (let i = 0; i < 21; ++i) {
+  for (let i = 0; i < 41; ++i) {
     let componentRenderURL = createComponentAdTrackerURL(uuid, i);
     adComponents.push({renderURL: componentRenderURL});
     adComponentsList.push(adComponents[0].renderURL);
@@ -374,7 +383,7 @@ subsetTest(promise_test, async test => {
                          adComponents: ${JSON.stringify(adComponentsList)}};`}),
             ads: [{renderURL: renderURL}],
             adComponents: adComponents}});
-}, 'Same component ad not allowed 21 times in bid.');
+}, 'Same component ad not allowed 41 times in bid.');
 
 subsetTest(promise_test, async test => {
   const uuid = generateUuid(test);
diff --git a/tests/wpt/tests/fledge/tentative/resources/direct-from-seller-signals.py b/tests/wpt/tests/fledge/tentative/resources/direct-from-seller-signals.py
index e94b9c5b47c..14f5ce156e7 100644
--- a/tests/wpt/tests/fledge/tentative/resources/direct-from-seller-signals.py
+++ b/tests/wpt/tests/fledge/tentative/resources/direct-from-seller-signals.py
@@ -1,5 +1,7 @@
 import json
 
+from fledge.tentative.resources import fledge_http_server_util
+
 # Script to return hardcoded "Ad-Auction-Signals" header to test header-based
 # directFromSellerSignals. Requires a "Sec-Ad-Auction-Fetch" header with value
 # of b"?1" in the request, otherwise returns a 400 response.
@@ -10,160 +12,133 @@ import json
 # For all positive test cases, header "Buyer-Origin" is required to be the
 # origin in perBuyerSignals, otherwise return 400 response.
 def main(request, response):
-    # Append CORS headers if needed.
-    if b"origin" in request.headers:
-      response.headers.set(b"Access-Control-Allow-Origin",
-                          request.headers.get(b"origin"))
+  if fledge_http_server_util.handle_cors_headers_and_preflight(request, response):
+    return
 
-    if b"credentials" in request.headers:
-      response.headers.set(b"Access-Control-Allow-Credentials",
-                          request.headers.get(b"credentials"))
+  # Return 400 if there is no "Sec-Ad-Auction-Fetch" header.
+  if ("Sec-Ad-Auction-Fetch" not in request.headers or
+      request.headers.get("Sec-Ad-Auction-Fetch") != b"?1"):
+    response.status = (400, b"Bad Request")
+    response.headers.set(b"Content-Type", b"text/plain")
+    return "Failed to get Sec-Ad-Auction-Fetch in headers or its value is not \"?1\"."
 
-    # Handle CORS preflight requests.
-    if request.method == u"OPTIONS":
-      if not b"Access-Control-Request-Method" in request.headers:
-        response.status = (400, b"Bad Request")
-        response.headers.set(b"Content-Type", b"text/plain")
-        return "Failed to get access-control-request-method in preflight!"
-
-      if not b"Access-Control-Request-Headers" in request.headers:
-        response.status = (400, b"Bad Request")
-        response.headers.set(b"Content-Type", b"text/plain")
-        return "Failed to get access-control-request-headers in preflight!"
-
-      response.headers.set(b"Access-Control-Allow-Methods",
-                           request.headers[b"Access-Control-Request-Method"])
-
-      response.headers.set(b"Access-Control-Allow-Headers",
-                           request.headers[b"Access-Control-Request-Headers"])
-
-      response.status = (204, b"No Content")
-      return
-
-    # Return 400 if there is no "Sec-Ad-Auction-Fetch" header.
-    if ("Sec-Ad-Auction-Fetch" not in request.headers or
-        request.headers.get("Sec-Ad-Auction-Fetch") != b"?1"):
-      response.status = (400, b"Bad Request")
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Failed to get Sec-Ad-Auction-Fetch in headers or its value is not \"?1\"."
-
-    # Return 500 to test http error.
-    if ("Negative-Test-Option" in request.headers and
-        request.headers.get("Negative-Test-Option") == b"HTTP Error"):
-      response.status = (500, b"Internal Error")
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Test http error with 500 response."
-
-    # Return 200 but without "Ad-Auction-Signals" header.
-    if ("Negative-Test-Option" in request.headers and
-        request.headers.get("Negative-Test-Option") == b"No Ad-Auction-Signals Header"):
-      response.status = (200, b"OK")
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Test 200 response without \"Ad-Auction-Signals\" header."
-
-    # Return 200 but with invalid json in "Ad-Auction-Signals" header.
-    if ("Negative-Test-Option" in request.headers and
-        request.headers.get("Negative-Test-Option") == b"Invalid Json"):
-      response.status = (200, b"OK")
-      response.headers.set("Ad-Auction-Signals", b"[{\"adSlot\": \"adSlot\", \"sellerSignals\": \"sellerSignals\", \"auctionSignals\":}]")
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Test 200 response with invalid json in \"Ad-Auction-Signals\" header."
-
-    # Return 404 but with valid "Ad-Auction-Signals" header to test network error.
-    if ("Negative-Test-Option" in request.headers and
-        request.headers.get("Negative-Test-Option") == b"Network Error"):
-      response.status = (404, b"Not Found")
-      adAuctionSignals = json.dumps(
-         [{
-            "adSlot": "adSlot",
-            "sellerSignals": "sellerSignals",
-            "auctionSignals": "auctionSignals"
-          }])
-      response.headers.set("Ad-Auction-Signals", adAuctionSignals)
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Test network error with 400 response code and valid \"Ad-Auction-Signals\" header."
-
-    # For positive test cases, buyer-origin is required, otherwise return 400.
-    if "Buyer-Origin" not in request.headers:
-      response.status = (400, "Bad Request")
-      response.headers.set(b"Content-Type", b"text/plain")
-      return "Failed to get Buyer-Origin in headers."
+  # Return 500 to test http error.
+  if ("Negative-Test-Option" in request.headers and
+      request.headers.get("Negative-Test-Option") == b"HTTP Error"):
+    response.status = (500, b"Internal Error")
+    response.headers.set(b"Content-Type", b"text/plain")
+    return "Test http error with 500 response."
 
+  # Return 200 but without "Ad-Auction-Signals" header.
+  if ("Negative-Test-Option" in request.headers and
+      request.headers.get("Negative-Test-Option") == b"No Ad-Auction-Signals Header"):
     response.status = (200, b"OK")
-    buyerOrigin = request.headers.get("Buyer-Origin").decode('utf-8')
+    response.headers.set(b"Content-Type", b"text/plain")
+    return "Test 200 response without \"Ad-Auction-Signals\" header."
 
-    altResponse = request.headers.get("Alternative-Response")
+  # Return 200 but with invalid json in "Ad-Auction-Signals" header.
+  if ("Negative-Test-Option" in request.headers and
+      request.headers.get("Negative-Test-Option") == b"Invalid Json"):
+    response.status = (200, b"OK")
+    response.headers.set("Ad-Auction-Signals", b"[{\"adSlot\": \"adSlot\", \"sellerSignals\": \"sellerSignals\", \"auctionSignals\":}]")
+    response.headers.set(b"Content-Type", b"text/plain")
+    return "Test 200 response with invalid json in \"Ad-Auction-Signals\" header."
 
-    if altResponse == b"Overwrite adSlot/1":
-      adAuctionSignals = json.dumps(
+  # Return 404 but with valid "Ad-Auction-Signals" header to test network error.
+  if ("Negative-Test-Option" in request.headers and
+      request.headers.get("Negative-Test-Option") == b"Network Error"):
+    response.status = (404, b"Not Found")
+    adAuctionSignals = json.dumps(
         [{
-          "adSlot": "adSlot/1",
-          "sellerSignals": "altSellerSignals/1",
+          "adSlot": "adSlot",
+          "sellerSignals": "sellerSignals",
+          "auctionSignals": "auctionSignals"
         }])
-    elif altResponse == b"Overwrite adSlot/1 v2":
-      adAuctionSignals = json.dumps(
-        [{
-          "adSlot": "adSlot/1",
-          "sellerSignals": "altV2SellerSignals/1",
-        }])
-    elif altResponse == b"Two keys with same values":
-      adAuctionSignals = json.dumps(
-        [{
-          "adSlot": "adSlot/1",
-          "sellerSignals": "sameSellerSignals",
-          "auctionSignals": "sameAuctionSignals",
-          "perBuyerSignals": { buyerOrigin: "samePerBuyerSignals" }
-        },
-        {
-          "adSlot": "adSlot/2",
-          "sellerSignals": "sameSellerSignals",
-          "auctionSignals": "sameAuctionSignals",
-          "perBuyerSignals": { buyerOrigin: "samePerBuyerSignals" }
-        }])
-    elif altResponse == b"Duplicate adSlot/1":
-      adAuctionSignals = json.dumps(
-        [{
-          "adSlot": "adSlot/1",
-          "sellerSignals": "firstSellerSignals/1",
-        },
-        {
-          "adSlot": "adSlot/2",
-          "sellerSignals": "nonDupSellerSignals/2",
-        },
-        {
-          "adSlot": "adSlot/1",
-          "sellerSignals": "secondSellerSignals/1",
-        }])
-    else:
-      adAuctionSignals = json.dumps(
-        [{
-          "adSlot": "adSlot/0",
-        },
-        {
-          "adSlot": "adSlot/1",
-          "sellerSignals": "sellerSignals/1",
-        },
-        {
-          "adSlot": "adSlot/2",
-          "auctionSignals": "auctionSignals/2",
-        },
-        {
-          "adSlot": "adSlot/3",
-          "perBuyerSignals": { buyerOrigin: "perBuyerSignals/3" }
-        },
-        {
-          "adSlot": "adSlot/4",
-          "sellerSignals": "sellerSignals/4",
-          "auctionSignals": "auctionSignals/4",
-          "perBuyerSignals": { buyerOrigin: "perBuyerSignals/4" }
-        },
-        {
-          "adSlot": "adSlot/5",
-          "sellerSignals": "sellerSignals/5",
-          "auctionSignals": "auctionSignals/5",
-          "perBuyerSignals": { "mismatchOrigin": "perBuyerSignals/5" }
-        }])
-
     response.headers.set("Ad-Auction-Signals", adAuctionSignals)
     response.headers.set(b"Content-Type", b"text/plain")
-    return
+    return "Test network error with 400 response code and valid \"Ad-Auction-Signals\" header."
+
+  # For positive test cases, buyer-origin is required, otherwise return 400.
+  if "Buyer-Origin" not in request.headers:
+    response.status = (400, "Bad Request")
+    response.headers.set(b"Content-Type", b"text/plain")
+    return "Failed to get Buyer-Origin in headers."
+
+  response.status = (200, b"OK")
+  buyerOrigin = request.headers.get("Buyer-Origin").decode('utf-8')
+
+  altResponse = request.headers.get("Alternative-Response")
+
+  if altResponse == b"Overwrite adSlot/1":
+    adAuctionSignals = json.dumps(
+      [{
+        "adSlot": "adSlot/1",
+        "sellerSignals": "altSellerSignals/1",
+      }])
+  elif altResponse == b"Overwrite adSlot/1 v2":
+    adAuctionSignals = json.dumps(
+      [{
+        "adSlot": "adSlot/1",
+        "sellerSignals": "altV2SellerSignals/1",
+      }])
+  elif altResponse == b"Two keys with same values":
+    adAuctionSignals = json.dumps(
+      [{
+        "adSlot": "adSlot/1",
+        "sellerSignals": "sameSellerSignals",
+        "auctionSignals": "sameAuctionSignals",
+        "perBuyerSignals": { buyerOrigin: "samePerBuyerSignals" }
+      },
+      {
+        "adSlot": "adSlot/2",
+        "sellerSignals": "sameSellerSignals",
+        "auctionSignals": "sameAuctionSignals",
+        "perBuyerSignals": { buyerOrigin: "samePerBuyerSignals" }
+      }])
+  elif altResponse == b"Duplicate adSlot/1":
+    adAuctionSignals = json.dumps(
+      [{
+        "adSlot": "adSlot/1",
+        "sellerSignals": "firstSellerSignals/1",
+      },
+      {
+        "adSlot": "adSlot/2",
+        "sellerSignals": "nonDupSellerSignals/2",
+      },
+      {
+        "adSlot": "adSlot/1",
+        "sellerSignals": "secondSellerSignals/1",
+      }])
+  else:
+    adAuctionSignals = json.dumps(
+      [{
+        "adSlot": "adSlot/0",
+      },
+      {
+        "adSlot": "adSlot/1",
+        "sellerSignals": "sellerSignals/1",
+      },
+      {
+        "adSlot": "adSlot/2",
+        "auctionSignals": "auctionSignals/2",
+      },
+      {
+        "adSlot": "adSlot/3",
+        "perBuyerSignals": { buyerOrigin: "perBuyerSignals/3" }
+      },
+      {
+        "adSlot": "adSlot/4",
+        "sellerSignals": "sellerSignals/4",
+        "auctionSignals": "auctionSignals/4",
+        "perBuyerSignals": { buyerOrigin: "perBuyerSignals/4" }
+      },
+      {
+        "adSlot": "adSlot/5",
+        "sellerSignals": "sellerSignals/5",
+        "auctionSignals": "auctionSignals/5",
+        "perBuyerSignals": { "mismatchOrigin": "perBuyerSignals/5" }
+      }])
+
+  response.headers.set("Ad-Auction-Signals", adAuctionSignals)
+  response.headers.set(b"Content-Type", b"text/plain")
+  return
diff --git a/tests/wpt/tests/fledge/tentative/resources/fledge_http_server_util.py b/tests/wpt/tests/fledge/tentative/resources/fledge_http_server_util.py
index a5c9c9715aa..162c93e8b06 100644
--- a/tests/wpt/tests/fledge/tentative/resources/fledge_http_server_util.py
+++ b/tests/wpt/tests/fledge/tentative/resources/fledge_http_server_util.py
@@ -1,7 +1,18 @@
-# Takes a map of header names to list of values that are all binary strings
-# and returns an otherwise identical map where keys and values have both been
-# converted to ASCII strings.
-def headersToAscii(headers):
+"""Utility functions shared across multiple endpoints."""
+
+
+def headers_to_ascii(headers):
+  """Converts a header map with binary values to one with ASCII values.
+
+  Takes a map of header names to list of values that are all binary strings
+  and returns an otherwise identical map where keys and values have both been
+  converted to ASCII strings.
+
+  Args:
+    headers: header map from binary key to binary value
+
+  Returns header map from ASCII string key to ASCII string value
+  """
   header_map = {}
   for pair in headers.items():
       values = []
@@ -9,3 +20,48 @@ def headersToAscii(headers):
           values.append(value.decode("ASCII"))
       header_map[pair[0].decode("ASCII")] = values
   return header_map
+
+
+def handle_cors_headers_and_preflight(request, response):
+  """Applies CORS logic common to many entrypoints.
+
+  Args:
+    request: the wptserve Request that was passed to main
+    response: the wptserve Response that was passed to main
+
+  Returns True if the request is a CORS preflight, which is entirely handled by
+  this function, so that the calling function should immediately return.
+  """
+  # Append CORS headers if needed
+  if b"origin" in request.headers:
+    response.headers.set(b"Access-Control-Allow-Origin",
+                        request.headers.get(b"origin"))
+
+  if b"credentials" in request.headers:
+    response.headers.set(b"Access-Control-Allow-Credentials",
+                        request.headers.get(b"credentials"))
+
+  # Handle CORS preflight requests.
+  if not request.method == u"OPTIONS":
+    return False
+
+  if not b"Access-Control-Request-Method" in request.headers:
+    response.status = (400, b"Bad Request")
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.content = "Failed to get access-control-request-method in preflight!"
+    return True
+
+  if not b"Access-Control-Request-Headers" in request.headers:
+    response.status = (400, b"Bad Request")
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.content = "Failed to get access-control-request-headers in preflight!"
+    return True
+
+  response.headers.set(b"Access-Control-Allow-Methods",
+                        request.headers[b"Access-Control-Request-Method"])
+
+  response.headers.set(b"Access-Control-Allow-Headers",
+                        request.headers[b"Access-Control-Request-Headers"])
+
+  response.status = (204, b"No Content")
+  return True
diff --git a/tests/wpt/tests/fledge/tentative/resources/request-tracker.py b/tests/wpt/tests/fledge/tentative/resources/request-tracker.py
index 9fe20bf83ac..c449d2ab021 100644
--- a/tests/wpt/tests/fledge/tentative/resources/request-tracker.py
+++ b/tests/wpt/tests/fledge/tentative/resources/request-tracker.py
@@ -1,11 +1,12 @@
+import json
 import mimetypes
 import os
-import json
-import wptserve.stash
-from fledge.tentative.resources.fledge_http_server_util import headersToAscii
 
+from fledge.tentative.resources import fledge_http_server_util
+import wptserve.stash
 from wptserve.utils import isomorphic_decode, isomorphic_encode
 
+
 # Test server that tracks requests it has previously seen, keyed by a token.
 #
 # All requests have a "dispatch" field indicating what to do, and a "uuid"
@@ -92,7 +93,7 @@ def main(request, response):
             if server_state["trackedHeaders"] != None:
                 server_state["errors"].append("Second track_headers request received.")
             else:
-                server_state["trackedHeaders"] = headersToAscii(request.headers)
+                server_state["trackedHeaders"] = fledge_http_server_util.headers_to_ascii(request.headers)
 
             stash.put(uuid, server_state)
             return simple_response(request, response, 200, b"OK", b"")
diff --git a/tests/wpt/tests/fledge/tentative/resources/trusted-bidding-signals.py b/tests/wpt/tests/fledge/tentative/resources/trusted-bidding-signals.py
index 5ec487fcc90..45bede2c451 100644
--- a/tests/wpt/tests/fledge/tentative/resources/trusted-bidding-signals.py
+++ b/tests/wpt/tests/fledge/tentative/resources/trusted-bidding-signals.py
@@ -1,6 +1,8 @@
 import json
 from urllib.parse import unquote_plus
-from fledge.tentative.resources.fledge_http_server_util import headersToAscii
+
+from fledge.tentative.resources import fledge_http_server_util
+
 
 # Script to generate trusted bidding signals. The response depends on the
 # keys and interestGroupNames - some result in entire response failures, others
@@ -103,7 +105,7 @@ def main(request, response):
             elif key == "hostname":
                 value = request.GET.first(b"hostname", b"not-found").decode("ASCII")
             elif key == "headers":
-                value = headersToAscii(request.headers)
+                value = fledge_http_server_util.headers_to_ascii(request.headers)
             elif key == "slotSize":
                 value = request.GET.first(b"slotSize", b"not-found").decode("ASCII")
             elif key == "allSlotsRequestedSizes":
diff --git a/tests/wpt/tests/fledge/tentative/resources/trusted-scoring-signals.py b/tests/wpt/tests/fledge/tentative/resources/trusted-scoring-signals.py
index fc6ec79096c..80488a5d6af 100644
--- a/tests/wpt/tests/fledge/tentative/resources/trusted-scoring-signals.py
+++ b/tests/wpt/tests/fledge/tentative/resources/trusted-scoring-signals.py
@@ -1,6 +1,8 @@
 import json
 from urllib.parse import unquote_plus, urlparse
-from fledge.tentative.resources.fledge_http_server_util import headersToAscii
+
+from fledge.tentative.resources import fledge_http_server_util
+
 
 # Script to generate trusted scoring signals. The responses depends on the
 # query strings in the ads Urls - some result in entire response failures,
@@ -119,7 +121,7 @@ def main(request, response):
                     elif signalsParam == "hostname":
                         value = request.GET.first(b"hostname", b"not-found").decode("ASCII")
                     elif signalsParam == "headers":
-                        value = headersToAscii(request.headers)
+                        value = fledge_http_server_util.headers_to_ascii(request.headers)
             if addValue:
                 if urlList["type"] not in responseBody:
                     responseBody[urlList["type"]] = {}
diff --git a/tests/wpt/tests/fonts/hasubi-mono/HasubiMono-Regular.woff2 b/tests/wpt/tests/fonts/hasubi-mono/HasubiMono-Regular.woff2
new file mode 100644
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f&DJQ!nanlKzx}85%zh?w-|O1km!h0W7<2#tM-ECz

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/fonts/hasubi-mono/LICENSE.txt b/tests/wpt/tests/fonts/hasubi-mono/LICENSE.txt
new file mode 100644
index 00000000000..d952d62c065
--- /dev/null
+++ b/tests/wpt/tests/fonts/hasubi-mono/LICENSE.txt
@@ -0,0 +1,92 @@
+This Font Software is licensed under the SIL Open Font License,
+Version 1.1.
+
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font
+creation efforts of academic and linguistic communities, and to
+provide a free and open framework in which fonts may be shared and
+improved in partnership with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply to
+any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software
+components as distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to,
+deleting, or substituting -- in part or in whole -- any of the
+components of the Original Version, by changing formats or by porting
+the Font Software to a new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed,
+modify, redistribute, and sell modified and unmodified copies of the
+Font Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components, in
+Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the
+corresponding Copyright Holder. This restriction only applies to the
+primary font name as presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created using
+the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/tests/wpt/tests/fonts/hasubi-mono/README.md b/tests/wpt/tests/fonts/hasubi-mono/README.md
new file mode 100644
index 00000000000..20bd1ea7ad0
--- /dev/null
+++ b/tests/wpt/tests/fonts/hasubi-mono/README.md
@@ -0,0 +1,7 @@
+This font is a monospace Arabic font, which helps test the interaction of bidi
+with line breaking, among other features.
+
+Some operating systems already ship with a monospace Arabic font by default, but
+not all do, so it is better to use a webfont.
+
+This font was obtained from https://github.com/eliheuer/hasubi-mono.
diff --git a/tests/wpt/tests/generic-sensor/generic-sensor-iframe-tests.sub.js b/tests/wpt/tests/generic-sensor/generic-sensor-iframe-tests.sub.js
index 8f13bd778e0..ed3415e66ec 100644
--- a/tests/wpt/tests/generic-sensor/generic-sensor-iframe-tests.sub.js
+++ b/tests/wpt/tests/generic-sensor/generic-sensor-iframe-tests.sub.js
@@ -147,24 +147,21 @@ function run_generic_sensor_iframe_tests(sensorData, readingData) {
     sensor.stop();
     await send_message_to_iframe(iframe, {command: 'stop_sensor'});
 
+    // The sensors are stopped; queue the same reading. The virtual sensor
+    // would send it anyway, but this update changes its timestamp.
+    await test_driver.update_virtual_sensor(testDriverName, reading);
+
     // Now focus the cross-origin iframe. The situation should be the opposite:
     // the sensor in the main frame should not fire any "reading" events or
     // provide access to updated readings, but the sensor in the iframe should.
     iframe.contentWindow.focus();
 
-    // Start both sensors. They should both have the same state: active, but no
-    // readings have been provided to them yet.
-    await send_message_to_iframe(iframe, {command: 'start_sensor'});
+    // Start both sensors. Only the iframe sensor should receive a reading
+    // event and contain readings.
     sensor.start();
     await sensorWatcher.wait_for('activate');
-    assert_false(
-        await send_message_to_iframe(iframe, {command: 'has_reading'}));
-    assert_false(sensor.hasReading);
-
-    const [serializedIframeSensor] = await Promise.all([
-      iframeSensorWatcher.wait_for_reading(),
-      test_driver.update_virtual_sensor(testDriverName, reading),
-    ]);
+    await send_message_to_iframe(iframe, {command: 'start_sensor'});
+    const serializedIframeSensor = await iframeSensorWatcher.wait_for_reading();
     assert_true(await send_message_to_iframe(iframe, {command: 'has_reading'}));
     assert_false(sensor.hasReading);
 
@@ -225,25 +222,17 @@ function run_generic_sensor_iframe_tests(sensorData, readingData) {
     // Focus a different same-origin window each time and check that everything
     // works the same.
     for (const windowObject of [window, iframe.contentWindow]) {
+      await test_driver.update_virtual_sensor(
+          testDriverName, readings.next().value);
+
       windowObject.focus();
 
       iframeSensor.start();
       sensor.start();
-      await Promise.all([
-        iframeSensorWatcher.wait_for('activate'),
-        sensorWatcher.wait_for('activate')
-      ]);
 
-      assert_false(sensor.hasReading);
-      assert_false(iframeSensor.hasReading);
-
-      // We store `reading` here because we want to make sure the very same
-      // value is accepted later.
-      const reading = readings.next().value;
       await Promise.all([
-        test_driver.update_virtual_sensor(testDriverName, reading),
-        iframeSensorWatcher.wait_for('reading'),
-        sensorWatcher.wait_for('reading')
+        iframeSensorWatcher.wait_for(['activate', 'reading']),
+        sensorWatcher.wait_for(['activate', 'reading'])
       ]);
 
       assert_greater_than(
diff --git a/tests/wpt/tests/generic-sensor/generic-sensor-tests.js b/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
index 292b562ff37..b4ed22554a0 100644
--- a/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
+++ b/tests/wpt/tests/generic-sensor/generic-sensor-tests.js
@@ -429,16 +429,16 @@ function runGenericSensorTests(sensorData, readingData) {
     assert_false(sensor.hasReading);
     assert_false(sensor.activated);
 
+    readings.reset();
+    await test_driver.update_virtual_sensor(
+        testDriverName, readings.next().value);
+
     sensor.start();
 
+    // Starting |sensor| again will cause the backing virtual sensor to report
+    // the previous reading automatically.
     await sensorWatcher.wait_for('activate');
-    assert_false(sensor.hasReading);
-    readings.reset();
-    await Promise.all([
-      test_driver.update_virtual_sensor(testDriverName, readings.next().value),
-      sensorWatcher.wait_for('reading')
-    ]);
-    assert_true(sensor.hasReading);
+    await sensorWatcher.wait_for('reading');
 
     assert_sensor_reading_equals(sensor, expected);
     // Make sure that 'timestamp' is already initialized.
@@ -607,7 +607,8 @@ function runGenericSensorTests(sensorData, readingData) {
       const eventWatcher = new EventWatcher(t, sensor1, ['activate']);
       sensor1.start();
       await eventWatcher.wait_for('activate');
-      test_driver.update_virtual_sensor(testDriverName, readings.next().value);
+      await test_driver.update_virtual_sensor(
+          testDriverName, readings.next().value);
     });
   }, `${sensorName}: Readings delivered by shared platform sensor are\
  immediately accessible to all sensors.`);
diff --git a/tests/wpt/tests/html/dom/reflection.js b/tests/wpt/tests/html/dom/reflection.js
index a5f7b3fd0a0..b2c3b30aae3 100644
--- a/tests/wpt/tests/html/dom/reflection.js
+++ b/tests/wpt/tests/html/dom/reflection.js
@@ -87,6 +87,90 @@ ReflectionTests.parseInt = function(input) {
     return sign * value;
 };
 
+/**
+ * The "rules for parsing floating-point number values" from the HTML spec.
+ * Returns false on error.
+ */
+ReflectionTests.parseFloat = function(input) {
+    var position = 0;
+    var value = 1;
+    var divisor = 1;
+    var exponent = 1;
+    // Skip whitespace
+    while (input.length > position && /^[ \t\n\f\r]$/.test(input[position])) {
+        position++;
+    }
+    if (position >= input.length) {
+        return false;
+    }
+    if (input[position] == "-") {
+        value = -1;
+        divisor = -1;
+        position++;
+    } else if (input[position] == "+") {
+        position++;
+    }
+    if (position >= input.length) {
+        return false;
+    }
+    if (input[position] == "." && position+1 < input.length && /^[0-9]$/.test(input[position+1])) {
+        value = 0;
+        // Use "else" branches rather than "jump to label fraction"
+    } else if (!/^[0-9]$/.test(input[position])) {
+        return false;
+    } else {
+        var val = 0;
+        while (input.length > position && /^[0-9]$/.test(input[position])) {
+            val *= 10;
+            // Don't use parseInt even for single-digit strings . . .
+            val += input.charCodeAt(position) - "0".charCodeAt(0);
+            position++;
+        }
+        value *= val;
+    }
+    // Use nested "if" tests rather than "jump to label conversion" or "skip"
+    // Fraction:
+    if (input.length > position && input[position] == ".") {
+        position++;
+        while (input.length > position && /^[0-9]$/.test(input[position])) {
+            divisor *= 10;
+            // Don't use parseInt even for single-digit strings . . .
+            value += (input.charCodeAt(position) - "0".charCodeAt(0)) / divisor;
+            position++;
+        }
+    }
+    if (input.length > position && (input[position] == "e" || input[position] == "E")) {
+        position++;
+        if (input.length > position) {
+            if (input[position] == "-") {
+                exponent = -1;
+                position++;
+            } else if (input[position] == "+") {
+                position++;
+            }
+            if (input.length > position && /^[0-9]$/.test(input[position])) {
+                var exp = 0;
+                do {
+                    exp *= 10;
+                    // Don't use parseInt even for single-digit strings . . .
+                    exp += input.charCodeAt(position) - "0".charCodeAt(0);
+                    position++;
+                } while (input.length > position && /^[0-9]$/.test(input[position]));
+                exponent *= exp;
+                value *= Math.pow(10, exponent);
+            }
+        }
+    }
+    // Conversion:
+    if (!Number.isFinite(value)) {
+      return false;
+    }
+    if (value === 0) {
+        return 0;
+    }
+    return value;
+}
+
 // Used in initializing typeMap
 var binaryString = "\x00\x01\x02\x03\x04\x05\x06\x07 "
     + "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f "
@@ -273,19 +357,19 @@ ReflectionTests.typeMap = {
         "jsType": "number",
         "defaultVal": 0,
         "domTests": [-36, -1, 0, 1, maxInt, minInt, maxInt + 1, minInt - 1,
-                     maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                     maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                      " " + binaryString + " foo ",
                      // Test various different whitespace. Only 20, 9, A, C,
                      // and D are whitespace.
                      "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                      "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                      "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                     "\u30007",
+                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                     "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                      undefined, 1.5, "5%", "+100", ".5", true, false, {"test": 6}, NaN, +Infinity,
                      -Infinity, "\0",
                      {toString:function() {return 2;}, valueOf: null},
-                     {valueOf:function() {return 3;}}],
+                     {valueOf:function() {return 3;}, toString: null}],
         "domExpected": function(val) {
             var parsed = ReflectionTests.parseInt(String(val));
             if (parsed === false || parsed > maxInt || parsed < minInt) {
@@ -314,17 +398,17 @@ ReflectionTests.typeMap = {
         "jsType": "number",
         "defaultVal": -1,
         "domTests": [minInt - 1, minInt, -36, -1, -0, 0, 1, maxInt, maxInt + 1,
-                     maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                     maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                      " " + binaryString + " foo ",
                      "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                      "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                      "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                     "\u30007",
+                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                     "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                      undefined, 1.5, "5%", "+100", ".5", true, false, {"test": 6}, NaN, +Infinity,
                      -Infinity, "\0",
                      {toString:function() {return 2;}, valueOf: null},
-                     {valueOf:function() {return 3;}}],
+                     {valueOf:function() {return 3;}, toString: null}],
         "domExpected": function(val) {
             var parsed = ReflectionTests.parseNonneg(String(val));
             if (parsed === false || parsed > maxInt || parsed < minInt) {
@@ -351,16 +435,16 @@ ReflectionTests.typeMap = {
         "jsType": "number",
         "defaultVal": 0,
         "domTests": [minInt - 1, minInt, -36,  -1,   0, 1, 257, maxInt,
-                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                      "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                      "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                      "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                     "\u30007",
+                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                     "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                      " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
                      {"test": 6}, NaN, +Infinity, -Infinity, "\0",
                      {toString:function() {return 2;}, valueOf: null},
-                     {valueOf:function() {return 3;}}],
+                     {valueOf:function() {return 3;}, toString: null}],
         "domExpected": function(val) {
             var parsed = ReflectionTests.parseNonneg(String(val));
             // Note maxInt, not maxUnsigned.
@@ -393,16 +477,16 @@ ReflectionTests.typeMap = {
         "jsType": "number",
         "defaultVal": 1,
         "domTests": [minInt - 1, minInt, -36,  -1,   0,    1, maxInt,
-                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                      "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                      "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                      "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                     "\u30007",
+                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                     "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                      " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
                      {"test": 6}, NaN, +Infinity, -Infinity, "\0",
                      {toString:function() {return 2;}, valueOf: null},
-                     {valueOf:function() {return 3;}}],
+                     {valueOf:function() {return 3;}, toString: null}],
         "domExpected": function(val) {
             var parsed = ReflectionTests.parseNonneg(String(val));
             // Note maxInt, not maxUnsigned.
@@ -433,16 +517,16 @@ ReflectionTests.typeMap = {
     "limited unsigned long with fallback": {
         "jsType": "number",
             "domTests": [minInt - 1, minInt, -36,  -1,   0,    1, maxInt,
-                         maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                         maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                          "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                          "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                          "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                         "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                         "\u30007",
+                         "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                         "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                          " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
                          {"test": 6}, NaN, +Infinity, -Infinity, "\0",
                          {toString:function() {return 2;}, valueOf: null},
-                         {valueOf:function() {return 3;}}],
+                         {valueOf:function() {return 3;}, toString: null}],
             "domExpected": function(val) {
                 var parsed = ReflectionTests.parseNonneg(String(val));
                 // Note maxInt, not maxUnsigned.
@@ -472,16 +556,16 @@ ReflectionTests.typeMap = {
     "clamped unsigned long": {
         "jsType": "number",
         "domTests": [minInt - 1, minInt, -36,  -1,   0,    1, maxInt,
-                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-1", "-0", "0", "1",
+                     maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+", "-1", "-0", "0", "1",
                      "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
                      "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
                      "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-                     "\u30007",
+                     "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+                     "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
                      " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
                      {"test": 6}, NaN, +Infinity, -Infinity, "\0",
                      {toString:function() {return 2;}, valueOf: null},
-                     {valueOf:function() {return 3;}}],
+                     {valueOf:function() {return 3;}, toString: null}],
         "idlTests": [0, 1, 257, maxInt, "-0", maxInt + 1, maxUnsigned],
         "idlDomExpected": [0, 1, 257, maxInt, 0, null, null],
     },
@@ -501,45 +585,84 @@ ReflectionTests.typeMap = {
      * "Except where otherwise specified, if an IDL attribute that is a
      * floating point number type (double) is assigned an Infinity or
      * Not-a-Number (NaN) value, a NOT_SUPPORTED_ERR exception must be raised."
-     *
-     * TODO: Implement the actual algorithm so we can run lots more tests.  For
-     * now we're stuck with manually setting up expected values.  Of course,
-     * a lot of care has to be taken in checking equality for floats . . .
-     * maybe we should have some tolerance for comparing them.  I'm not even
-     * sure whether setting the content attribute to 0 should return 0.0 or
-     * -0.0 (the former, I hope).
      */
     "double": {
         "jsType": "number",
         "defaultVal": 0.0,
         "domTests": [minInt - 1, minInt, -36, -1, 0, 1, maxInt,
-            maxInt + 1, maxUnsigned, maxUnsigned + 1, "",
+            maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+",
             "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
             "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
             "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
-            "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7",
-            "\u30007",
+            "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+            "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
             " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
+            "1.", "1e2", "1e+2", "1e-2", "1E2", "1E+2", "1E-2", "1.e2", "1.0e2",
+            "1. 1", "1 .1", "1. e2", "1 .e2", "1 e2", "1e 2", "1e -2", "1e- 2",
+            "1.8e308", "-1.8e308",
             {"test": 6}, NaN, +Infinity, -Infinity, "\0",
             {toString:function() {return 2;}, valueOf: null},
-            {valueOf:function() {return 3;}}],
-        "domExpected": [minInt - 1, minInt, -36, -1, 0, 1, maxInt,
-                        maxInt + 1, maxUnsigned, maxUnsigned + 1, null,
-                        // Leading whitespace tests
-                        7, null, 7, 7, null, null,
-                        7, 7, null, null, null, null,
-                        null, null, null, null, null, null,
-                        null, null, null, null, null, null,
-                        null,
-                        // End leading whitespace tests
-                        null, null, 1.5, 5, 100, 0.5, null, null,
-                        null, null, null, null, null,
-                        2, 3],
-        // I checked that ES ToString is well-defined for all of these (I
-        // think).  Yes, String(-0) == "0".
-        "idlTests":       [ -10000000000,   -1,  -0,   0,   1,   10000000000],
-        "idlDomExpected": ["-10000000000", "-1", "0", "0", "1", "10000000000"],
-        "idlIdlExpected": [ -10000000000,   -1,  -0,   0,   1,   10000000000]
+            {valueOf:function() {return 3;}, toString: null}],
+        "domExpected": function (val) {
+            var parsed = ReflectionTests.parseFloat(String(val));
+            if (parsed === false) {
+                return null;
+            }
+            return parsed;
+        },
+        "idlTests": [ -10000000000, -1, -0, 0, 1, 10000000000,
+            1e-10, 1e-4, 1.5, 1e25 ],
+        "idlIdlExpected": function (val) {
+            // This is a bit heavy-weight but hopefully will give values
+            // that compare "better" (without introducing some tolerance)
+            // when the test cases are expanded with more values.
+            return ReflectionTests.parseFloat(String(val));
+        }
+    },
+    /**
+     * Reflected IDL attribute of type double, limited to only positive values,
+     * are similar to the previous case with the following exceptions:
+     *
+     *  - on getting, if the parsed value is not greater than 0, then return
+     *    the default value
+     *  - on setting, if the value is not greater than 0, then return (leaving)
+     *    the attribute to its previous value.
+     */
+    "limited double": {
+        "jsType": "number",
+        "defaultVal": 0.0,
+        "domTests": [minInt - 1, minInt, -36, -1, 0, 1, maxInt,
+            maxInt + 1, maxUnsigned, maxUnsigned + 1, "", "-", "+",
+            "\u00097", "\u000B7", "\u000C7", "\u00207", "\u00A07", "\uFEFF7",
+            "\u000A7", "\u000D7", "\u20287", "\u20297", "\u16807", "\u180E7",
+            "\u20007", "\u20017", "\u20027", "\u20037", "\u20047", "\u20057",
+            "\u20067", "\u20077", "\u20087", "\u20097", "\u200A7", "\u202F7", "\u30007",
+            "\t\u000B7", "\n\u000B7","\f\u000B7", "\r\u000B7", "\x20\u000B7", "7\u000B",
+            " " + binaryString + " foo ", undefined, 1.5, "5%", "+100", ".5", true, false,
+            "1.", "1e2", "1e+2", "1e-2", "1E2", "1E+2", "1E-2", "1.e2", "1.0e2",
+            "1. 1", "1 .1", "1. e2", "1 .e2", "1 e2", "1e 2", "1e -2", "1e- 2",
+            "1.8e308", "-1.8e308",
+            {"test": 6}, NaN, +Infinity, -Infinity, "\0",
+            {toString:function() {return 2;}, valueOf: null},
+            {valueOf:function() {return 3;}, toString: null}],
+        "domExpected": function (val) {
+            var parsed = ReflectionTests.parseFloat(String(val));
+            if (parsed === false || parsed <= 0) {
+                return null;
+            }
+            return parsed;
+        },
+        "idlTests": [ -10000000000, -1, -0, 0, 1, 10000000000,
+            1e-10, 1e-4, 1.5, 1e25 ],
+        "idlIdlExpected": function (val) {
+            // Non-positive values are special-cased below, as they
+            // should be ignored, leaving the current value unchanged
+
+            // This is a bit heavy-weight but hopefully will give values
+            // that compare "better" (without introducing some tolerance)
+            // when the test cases are expanded with more values.
+            return ReflectionTests.parseFloat(String(val));
+        }
     }
 };
 
@@ -836,6 +959,13 @@ ReflectionTests.reflects = function(data, idlName, idlObj, domName, domObj) {
                 ReflectionHarness.assertThrows("IndexSizeError", function() {
                     idlObj[idlName] = idlTests[i];
                 });
+            } else if (data.type == "limited double" && idlTests[i] <= 0) {
+                domObj.setAttribute(domName, "previous value");
+                var previousIdl = idlObj[idlName]; // should be the default value
+                idlObj[idlName] = idlTests[i];
+                ReflectionHarness.assertEquals(domObj.getAttribute(domName),
+                                               "previous value", "getAttribute()");
+                ReflectionHarness.assertEquals(idlObj[idlName], previousIdl, "IDL get");
             } else {
                 idlObj[idlName] = idlTests[i];
                 if (data.type == "boolean") {
diff --git a/tests/wpt/tests/html/interaction/focus/the-autofocus-attribute/autofocus-area.html b/tests/wpt/tests/html/interaction/focus/the-autofocus-attribute/autofocus-area.html
new file mode 100644
index 00000000000..e1ff72eb61e
--- /dev/null
+++ b/tests/wpt/tests/html/interaction/focus/the-autofocus-attribute/autofocus-area.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#the-autofocus-attribute">
+<link rel='author' href='mailto:sefeng@mozilla.com'>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/utils.js"></script>
+
+<map name="mymap">
+  <area id="myarea" shape="circle" coords="100,100,80" href="#" autofocus>
+</map>
+<img style="width:200px; height: 200px"
+     usemap="#mymap"
+     src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR42mP4%2F58BAAT%2FAf9jgNErAAAAAElFTkSuQmCC">
+<script>
+promise_test(async t => {
+  await waitForLoad(window);
+  await waitUntilStableAutofocusState(window);
+  const area = document.querySelector("area");
+  assert_equals(document.activeElement, area);
+}, 'autofocus works on area element');
+</script>
diff --git a/tests/wpt/tests/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html b/tests/wpt/tests/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html
new file mode 100644
index 00000000000..da6ffe15bbe
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-css-user-agent-style-sheet-and-presentational-hints/no-help-cursor-on-links-wrapped-in-svg.historical.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>link with rel="help" cursor tests</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<link rel="help" href="https://html.spec.whatwg.org/#phrasing-content-3">
+<link rel="help" href="https://github.com/w3c/svgwg/issues/468">
+
+<div id="log"></div>
+
+<svg>
+<a href="/common/blank.html?unvisited" rel="help" id="unvisited">unvisited</a>
+<a href="/common/blank.html?willbevisited" rel="help" id="willbevisited">will be visited</a>
+</svg>
+
+<script>
+"use strict";
+
+
+test(() => {
+  const el = document.querySelector("#unvisited");
+  const style = window.getComputedStyle(el);
+
+  assert_equals(style.cursor, "pointer");
+},"Unvisited help links must have pointer cursor, not help cursor");
+
+
+// This test is kind of dubious. Browsers don't allow you to distinguish visited and unvisited links
+// from script, for privacy reasons. So we can't really be sure that loading the iframe would make
+// the link count as visited. Manually running this test turns the link purple in some browsers,
+// but leaves it blue in others. Even then it's not clear whether it turned purple before or after
+// the onload; this test assumes that once the iframe onload fires, it counts as visited, which
+// may not be justified even in the purple-turning browsers.
+//
+// Still, the test doesn't really hurt. At worst it's redundant with the above.
+//
+// If someone comes up with a better way of testing this (i.e. something that truly guarantees that
+// the link will count as "visited" for UA stylesheet purposes), then please submit a PR.
+async_test(t => {
+  const el = document.querySelector("#willbevisited");
+
+  const iframe = document.createElement("iframe");
+  iframe.src = el.href;
+  iframe.onload = t.step_func_done(() => {
+    const style = window.getComputedStyle(el);
+    assert_equals(style.cursor, "pointer");
+  });
+
+  document.body.appendChild(iframe);
+}, "Visited help links must have pointer cursor, not help cursor");
+</script>
diff --git a/tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.html
similarity index 100%
rename from tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.html
diff --git a/tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.html
similarity index 100%
rename from tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.html
diff --git a/tests/wpt/tests/html/rendering/widgets/field-sizing-select.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-select.html
similarity index 100%
rename from tests/wpt/tests/html/rendering/widgets/field-sizing-select.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-select.html
diff --git a/tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.html
similarity index 100%
rename from tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.html
diff --git a/tests/wpt/tests/html/rendering/widgets/input-text-size.html b/tests/wpt/tests/html/rendering/widgets/input-text-size.html
index 7f2948280c0..fb3008df08f 100644
--- a/tests/wpt/tests/html/rendering/widgets/input-text-size.html
+++ b/tests/wpt/tests/html/rendering/widgets/input-text-size.html
@@ -13,6 +13,7 @@
 <input id="size20" size="20">
 <input id="size21" size="21">
 <input id="computed" style="border:none; padding:0;" size="19">
+<input id="computedNone" style="display:none" size="17">
 
 <script>
 test(() => {
@@ -34,6 +35,11 @@ test(() => {
   const computedString = getComputedStyle(computed).width;
   assert_equals(computed.offsetWidth,
       parseInt(computedString.substring(0, computedString.length - 2)));
-}, 'Size attribute value affects computed style');
+}, 'Size attribute value affects layout-dependent computed style');
+
+test(() => {
+  const computedString = getComputedStyle(computedNone).width;
+  assert_equals(computedString, 'auto');
+}, 'Size attribute value is not a presentational hint');
 </script>
 
diff --git a/tests/wpt/tests/html/rendering/widgets/textarea-cols-rows.html b/tests/wpt/tests/html/rendering/widgets/textarea-cols-rows.html
index 012c5aa153d..6ad24a2eb8b 100644
--- a/tests/wpt/tests/html/rendering/widgets/textarea-cols-rows.html
+++ b/tests/wpt/tests/html/rendering/widgets/textarea-cols-rows.html
@@ -8,6 +8,7 @@
 <textarea id="missing"></textarea>
 <textarea id="invalid" cols="-1" rows="-1"></textarea>
 <textarea id="computed" style="border:none; padding:0;" cols="19" rows="5"></textarea>
+<textarea id="computedNone" style="display:none" cols="17" rows="7"></textarea>
 
 <textarea id="cols0" cols="0"></textarea>
 <textarea id="cols1" cols="1"></textarea>
@@ -52,6 +53,12 @@ test(() => {
   const computedHeight = getComputedStyle(computed).height;
   assert_equals(computed.offsetHeight,
       parseInt(computedHeight.substring(0, computedHeight.length - 2)));
-}, 'Cols/rows attribute values affect computed style');
+}, 'Cols/rows attribute values affect layout-dependent computed style');
+
+test(() => {
+  const computedNoneStyle = getComputedStyle(computedNone);
+  assert_equals(computedNoneStyle.width, 'auto');
+  assert_equals(computedNoneStyle.height, 'auto');
+}, 'Cols/rows attribute values are not presentational hints');
 </script>
 
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/resources/stylable-select-styles.css b/tests/wpt/tests/html/semantics/forms/the-select-element/resources/stylable-select-styles.css
new file mode 100644
index 00000000000..726380f940d
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/resources/stylable-select-styles.css
@@ -0,0 +1,18 @@
+.stylable-select-datalist {
+  box-shadow: 0px 12.8px 28.8px rgba(0, 0, 0, 0.13), 0px 0px 9.2px rgba(0, 0, 0, 0.11);
+  box-sizing: border-box;
+  overflow: auto;
+  border: 1px solid rgba(0, 0, 0, 0.15);
+  border-radius: 0.25em;
+  padding: 0.25em 0;
+  background-color: Field;
+  margin: 0;
+  inset: auto;
+  min-inline-size: anchor-size(self-inline);
+  min-block-size: 1lh;
+  inset-block-start: anchor(auto);
+  inset-inline-start: anchor(auto-same);
+
+  font-family: Arial;
+  font-size: 13.3333px;
+}
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-ref.html b/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-ref.html
new file mode 100644
index 00000000000..46bbd0ccd06
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel=stylesheet href="resources/stylable-select-styles.css">
+
+<button popovertarget=popover id=button>button</button>
+<div id=popover popover=auto anchor=button class=stylable-select-datalist>
+  <option>one</option>
+  <option>two</option>
+</div>
+
+<script>
+document.getElementById('popover').showPopover();
+</script>
diff --git a/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html b/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
new file mode 100644
index 00000000000..b74957feed8
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/9799">
+<link rel=match href="select-child-button-and-datalist-ref.html">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<select>
+  <button type=popover>button</button>
+  <datalist>
+    <option>one</option>
+    <option>two</option>
+  </datalist>
+</select>
+
+<script>
+document.querySelector('button').click();
+</script>
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.html
new file mode 100644
index 00000000000..5c2e70f87a6
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/5802">
+<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>
+
+<button>button</button>
+<dialog>hello world</dialog>
+
+<script>
+const dialog = document.querySelector('dialog');
+const button = document.querySelector('button');
+
+promise_test(async t => {
+  dialog.showModal();
+
+  let closeFired = false;
+  let cancelFired = false;
+  dialog.addEventListener('close', () => closeFired = true);
+  dialog.addEventListener('cancel', () => cancelFired = true);
+
+  dialog.removeAttribute('open');
+  await new Promise(resolve => t.step_timeout(resolve, 0));
+  await new Promise(requestAnimationFrame);
+
+  assert_false(dialog.matches(':modal'),
+    'The dialog should not match :modal after closing.');
+  assert_false(cancelFired,
+    'The cancel event should not fire when removing the open attribute.');
+  assert_true(closeFired,
+    'The close event should be fired when removing the open attribute.');
+
+  let buttonFiredClick = false;
+  button.addEventListener('click', () => buttonFiredClick = true);
+  await test_driver.click(button);
+  assert_true(buttonFiredClick,
+    'The page should not be inert or blocked after removing the open attribute.');
+}, 'Removing the open attribute from an open modal dialog should run the closing algorithm.');
+
+promise_test(async t => {
+  dialog.show();
+
+  let closeFired = false;
+  let cancelFired = false;
+  dialog.addEventListener('close', () => closeFired = true);
+  dialog.addEventListener('cancel', () => cancelFired = true);
+
+  dialog.removeAttribute('open');
+  await new Promise(resolve => t.step_timeout(resolve, 0));
+  await new Promise(requestAnimationFrame);
+
+  assert_false(cancelFired,
+    'The cancel event should not fire when removing the open attribute.');
+  assert_true(closeFired,
+    'The close event should be fired when removing the open attribute.');
+}, 'Removing the open attribute from an open non-modal dialog should fire a close event.');
+</script>
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html
index 82f201f11aa..43a17676ed1 100644
--- a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-focus-previous-outside.html
@@ -3,7 +3,6 @@
 <link rel=help href="https://github.com/whatwg/html/issues/8904">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <button id=b1>button 1</button>
 <button id=b2>button 2</button>
@@ -33,8 +32,6 @@
 <dialog id=mydialog2>hello world</dialog>
 
 <script>
-polyfill_declarative_shadow_dom(document);
-
 test(() => {
   b1.focus();
   mydialog.show();
diff --git a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html
index 5edff186142..47612e759ea 100644
--- a/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html
+++ b/tests/wpt/tests/html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html
@@ -161,11 +161,11 @@
     assert_equals(topElement(), d11);
 
     // Removing the open attribute and running through the showModal() algorithm
-    // again should not promote d10 to the top.
+    // again should promote d10 to the top.
     d10.removeAttribute("open");
     assert_equals(topElement(), d11);
     d10.showModal();
-    assert_equals(topElement(), d11);
+    assert_equals(topElement(), d10);
 
     // Closing d11 with close() should cause d10 to be the topmost element.
     d11.close();
diff --git a/tests/wpt/tests/html/semantics/popovers/label-in-invoker.html b/tests/wpt/tests/html/semantics/popovers/label-in-invoker.html
new file mode 100644
index 00000000000..bf8ab9710dc
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/label-in-invoker.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1523168">
+<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>
+
+<button popovertarget=mypopover>
+  <label>label</label>
+</button>
+<div id=mypopover popover=auto>popover</div>
+
+<script>
+promise_test(async() => {
+  const label = document.querySelector('label');
+  assert_false(mypopover.matches(':popover-open'),
+    'Popover should be closed at the start of the test.');
+  await test_driver.click(label);
+  assert_true(mypopover.matches(':popover-open'),
+    'The popover should be opened by clicking on the label.');
+}, 'Buttons with popovertarget should invoke targets even if there is a label in the button.');
+</script>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html
index 68473174eda..ef3b35aea40 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html
@@ -27,11 +27,9 @@
     <script src="/resources/testdriver.js"></script>
     <script src="/resources/testdriver-actions.js"></script>
     <script src="/resources/testdriver-vendor.js"></script>
-    <script src="/resources/declarative-shadow-dom-polyfill.js"></script>
     <script src="resources/popover-utils.js"></script>
     <script>
         promise_test(async () => {
-            polyfill_declarative_shadow_dom(outerPopover);
             const innerPopoverToggle = outerPopover.shadowRoot.querySelector("#innerPopoverToggle");
             const innerContainer = outerPopover.shadowRoot.querySelector('#innerContainer');
             const innerPopover = innerContainer.shadowRoot.querySelector("#innerPopover");
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree.html b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree.html
index 26c8d7af4c1..65008e28ef8 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree.html
@@ -22,11 +22,9 @@
     <script src="/resources/testdriver.js"></script>
     <script src="/resources/testdriver-actions.js"></script>
     <script src="/resources/testdriver-vendor.js"></script>
-    <script src="/resources/declarative-shadow-dom-polyfill.js"></script>
     <script src="resources/popover-utils.js"></script>
     <script>
         promise_test(async () => {
-            polyfill_declarative_shadow_dom(outerPopover);
             const innerPopoverToggle = outerPopover.shadowRoot.querySelector("#innerPopoverToggle");
             const innerPopover = outerPopover.shadowRoot.querySelector("#innerPopover");
 
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss.html b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss.html
index 0c51693aa12..916d52ef5ed 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss.html
@@ -9,7 +9,6 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-actions.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="resources/popover-utils.js"></script>
 
 <button id=b1t popovertarget='p1'>Popover 1</button>
@@ -333,7 +332,6 @@
   </template>
 </my-element>
 <script>
-  polyfill_declarative_shadow_dom(document.querySelector('#myElement'));
   const button7 = document.querySelector('#myElement').shadowRoot.querySelector('#b7');
   const popover7 = document.querySelector('#myElement').shadowRoot.querySelector('#p7');
   const inside7 = document.querySelector('#myElement').shadowRoot.querySelector('#inside7');
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-shadow-dom.html b/tests/wpt/tests/html/semantics/popovers/popover-shadow-dom.html
index 87293f1e3d5..62aa135b562 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-shadow-dom.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-shadow-dom.html
@@ -5,7 +5,6 @@
 <link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="resources/popover-utils.js"></script>
 
 <script>
@@ -184,7 +183,6 @@
 </div>
 <script>
   promise_test(async function() {
-    polyfill_declarative_shadow_dom(test5);
     const [popover1,popover2] = getPopoverReferences('test5');
     popover1.showPopover();
     popover1.querySelector('button').click(); // Use invoker to keep 2 visible
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-shadowhost-focus.html b/tests/wpt/tests/html/semantics/popovers/popover-shadowhost-focus.html
index d5899d21bb0..91ee547d4e3 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-shadowhost-focus.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-shadowhost-focus.html
@@ -3,7 +3,6 @@
 <link rel=help href="https://github.com/whatwg/html/issues/8994">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <div popover=auto tabindex=0 data-test="autofocus=true, delegatesfocus=false" autofocus class=should-be-focused>
   <template shadowrootmode=open>
@@ -32,8 +31,6 @@
 </div>
 
 <script>
-polyfill_declarative_shadow_dom(document);
-
 document.querySelectorAll('body > [popover]').forEach(popover => {
   promise_test(async () => {
     const expectedFocusedElement = (popover.matches('.should-be-focused') ? popover : null)
diff --git a/tests/wpt/tests/intersection-observer/scroll-margin-iframe.html b/tests/wpt/tests/intersection-observer/scroll-margin-iframe.html
new file mode 100644
index 00000000000..1d63c65169b
--- /dev/null
+++ b/tests/wpt/tests/intersection-observer/scroll-margin-iframe.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="./resources/intersection-observer-test-utils.js"></script>
+
+<iframe
+  id="target-iframe"
+  src="resources/iframe-no-root-subframe.html"
+  width="300"
+  height="200"
+></iframe>
+
+<script>
+var iframe = document.getElementById("target-iframe");
+var target;
+var entries = [];
+
+iframe.onload = function() {
+  runTestCycle(function() {
+    assert_true(!!iframe, "iframe exists");
+
+    target = iframe.contentDocument.getElementById("target");
+    assert_true(!!target, "Target element exists.");
+
+    var observer = new IntersectionObserver(function(changes) {
+      entries = entries.concat(changes)
+    }, {
+      scrollMargin: "18px"
+    });
+    observer.observe(target);
+
+    entries = entries.concat(observer.takeRecords());
+    assert_equals(entries.length, 0, "No initial notifications.");
+
+    runTestCycle(testIntersection, "Test scroll margin intersection");
+  }, "Observer with the implicit root; target in a same-origin iframe.");
+};
+
+function testIntersection() {
+  assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
+  assert_true(entries[0].isIntersecting, "isIntersecting");
+  assert_approx_equals(entries[0].intersectionRatio, 0.1, 0.001, "intersectionRatio");
+}
+</script>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location-redirect.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location-redirect.html
index a6bfd68f809..c0bb96b1ec5 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location-redirect.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location-redirect.html
@@ -50,22 +50,20 @@ function test_source_location_with_redirect({path, type, name}) {
       }, script => script.duration >= VERY_LONG_FRAME_DURATION - 5, t);
 
       const result =
-        script.sourceLocation.startsWith(postRedirectURL) ? "post-redirect" :
-        script.sourceLocation.startsWith(preRedirectURL) ? "pre-redirect" :
-        script.sourceLocation === "" ?
+        script.sourceURL.startsWith(postRedirectURL) ? "post-redirect" :
+        script.sourceURL.startsWith(preRedirectURL) ? "pre-redirect" :
+        script.sourceURL === "" ?
         "empty" : "other";
 
-      assert_not_equals(result, "other", `Unexpected source location ${script.sourceLocation}`);
+      assert_not_equals(result, "other", `Unexpected source location ${script.sourceURL}`);
       if (!cors)
         assert_equals(script.executionStart, script.startTime, "Opaque scripts should hide execution start time");
 
       if (cors) {
         assert_not_equals(result, "empty", "CORS-ok scripts should expose sourceLocation");
       } else {
-        const char_index = result === "empty" ? 0 :
-          parseInt(script.sourceLocation.match(/\:(\d+)$/)?.[1] ?? "0");
         assert_not_equals(result, "post-redirect", "No-CORS classic scripts should not expose post-redirect URL");
-        assert_equals(char_index, 0, "No-CORS classic scripts should not expose character index");
+        assert_equals(script.sourceCharPosition, type === "script-block" ? 0 : -1, "No-CORS classic scripts should not expose character index");
       }
     }, `Test ${type} with ${scriptType}`);
   }
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location.html
index cdd4bb4bbc9..51e85656443 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-source-location.html
@@ -11,16 +11,15 @@
 <div id="log"></div>
 <script>
 
-const source_location_regex = /^([^@]+\@)?https?\:\/\/[^\/]+[^\:]+\:\d*$/;
-
 promise_test(async t => {
   const [entry, script] = await expect_long_frame_with_script(() => {
     requestAnimationFrame(function non_bound_function() {
       busy_wait();
     });
   }, script => script.invoker === "FrameRequestCallback", t);
-  assert_true(script.sourceLocation?.startsWith("non_bound_function"));
-  assert_regexp_match(script.sourceLocation, source_location_regex);
+  assert_equals(script.sourceURL, location.href);
+  assert_equals(script.sourceFunctionName, "non_bound_function");
+  assert_greater_than(script.sourceCharPosition, 0);
 }, "Source location should be extracted from non-bound functions");
 
 promise_test(async t => {
@@ -30,8 +29,9 @@ promise_test(async t => {
       busy_wait();
     }).bind(object));
   }, script => script.invoker === "FrameRequestCallback", t);
-  assert_true(script.sourceLocation?.startsWith("my_bound_function"));
-  assert_regexp_match(script.sourceLocation, source_location_regex);
+  assert_equals(script.sourceURL, location.href);
+  assert_equals(script.sourceFunctionName, "my_bound_function");
+  assert_greater_than(script.sourceCharPosition, 0);
 }, "Source location should be extracted from bound functions");
 
 promise_test(async t => {
@@ -39,9 +39,8 @@ promise_test(async t => {
     t.step_timeout(function my_timeout() {
       busy_wait();
     });
-  }, script => script.invoker === "TimerHandler:setTimeout" && script.sourceLocation, t );
-  assert_true(script.sourceLocation.includes("testharness.js"));
-  assert_regexp_match(script.sourceLocation, source_location_regex);
+  }, script => script.invoker === "TimerHandler:setTimeout" && script.sourceURL, t );
+  assert_true(script.sourceURL.includes("testharness.js"));
 }, "Source location should be extracted for setTimeout");
 
 promise_test(async t => {
@@ -51,7 +50,7 @@ promise_test(async t => {
     scriptElement.src = scriptLocation;
     document.body.appendChild(scriptElement);
   }, script => script.invoker === "Window.fetch.then", t);
-  assert_true(script.sourceLocation?.includes("promise-generates-loaf.js"));
+  assert_true(script.sourceURL.includes("promise-generates-loaf.js"));
 }, "Source location should be extracted for promises");
 
 </script>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-stream-source-location.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-stream-source-location.html
index 79fb418f829..0fd30859d73 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-stream-source-location.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-stream-source-location.html
@@ -11,8 +11,6 @@
 <div id="log"></div>
 <script>
 
-const source_location_regex = /^([^@]+\@)?https?\:\/\/[^\/]+[^\:]+\:\d*$/;
-
 promise_test(async t => {
   const scriptLocation = new URL("resources/stream-promise-generates-loaf.js", location.href);
   const [entry, script] = await expect_long_frame_with_script(() => {
@@ -21,7 +19,7 @@ promise_test(async t => {
     document.body.appendChild(scriptElement);
   }, script => script.invoker === "StreamPromise.resolve.then", t);
 
-  assert_true(script.sourceLocation?.includes("stream-promise-generates-loaf.js"));
+  assert_true(script.sourceURL.includes("stream-promise-generates-loaf.js"));
 }, "Source location should be extracted for stream promises");
 
 </script>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010-ref.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010-ref.html
new file mode 100644
index 00000000000..84104dec03a
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <style type="text/css">
+      div#bigsquare {
+          position: absolute;
+          width: 100px;
+          height: 100px;
+          background: blue;
+      }
+
+      div#smallsquare {
+          position:absolute;
+          width: 20px;
+          height: 20px;
+          left: 20px;
+          top: 10px;
+          background: red;
+      }
+      /*left = lspace = 20px;
+        top = heightBig - voffset - heightSmall;
+            = 50 - 30 - 10
+            = 10px */
+    </style>
+  </head>
+  <body>
+    <div id="bigsquare">
+      <div id="smallsquare">
+      </div>
+    </div>
+  </body>
+<html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010.html
new file mode 100644
index 00000000000..bc0b73788b5
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-010.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#inner-box-and-requested-parameters">
+    <meta name="assert" content="Verify basic rendering of mpadded.">
+    <link rel="match" href="mpadded-010-ref.html">
+  </head>
+  <body>
+    <math>
+      <mpadded mathbackground="blue" width="100px" height="50px" depth="50px"
+               lspace="20px" voffset="30px">
+        <mpadded mathbackground="red" width="20px" height="10px"
+                 depth="10px">
+        </mpadded>
+      </mpadded>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011-ref.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011-ref.html
new file mode 100644
index 00000000000..36122687e15
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011-ref.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <style type="text/css">
+      div#bigsquare {
+          position: absolute;
+          width: 100px;
+          height: 100px;
+          background: blue;
+      }
+
+      div#smallsquare {
+          position:absolute;
+          width: 20px;
+          height: 20px;
+          left: 20px;
+          top: 60px;
+          background: red;
+      }
+      /*left = lspace = 20px;
+        top = heightBig - voffset - heightSmall;
+            = 50 + 20 - 10
+            = 60px */
+    </style>
+  </head>
+  <body>
+    <div id="bigsquare">
+      <div id="smallsquare">
+      </div>
+    </div>
+  </body>
+<html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011.html
new file mode 100644
index 00000000000..4bcdd13f77e
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-011.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#inner-box-and-requested-parameters">
+    <meta name="assert" content="Verify basic rendering of mpadded.">
+    <link rel="match" href="mpadded-011-ref.html">
+  </head>
+  <body>
+    <math>
+      <mpadded mathbackground="blue" width="100px" height="50px" depth="50px"
+               lspace="20px" voffset="-20px">
+        <mpadded mathbackground="red" width="20px" height="10px"
+                 depth="10px">
+        </mpadded>
+      </mpadded>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012-ref.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012-ref.html
new file mode 100644
index 00000000000..12f65c46f7f
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012-ref.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <style type="text/css">
+      div#square1 {
+          position: absolute;
+          width: 100px;
+          height: 100px;
+          background: blue;
+      }
+
+      div#square2 {
+          position:absolute;
+          width: 20px;
+          height: 20px;
+          left: 10px;
+          top: 55px;
+          background: red;
+      }
+      /* left = lspace = 10;
+         top = heightBig - heightSmall - voffset;
+         top = 50 - 10 + 15 = 55px */
+    </style>
+  </head>
+  <body>
+    <div id="square1">
+      <div id="square2">
+      </div>
+    </div>
+  </body>
+<html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012.html
new file mode 100644
index 00000000000..f6ce585010f
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-012.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#inner-box-and-requested-parameters">
+    <meta name="assert" content="Verify basic rendering of mpadded.">
+    <link rel="match" href="mpadded-012-ref.html">
+  </head>
+  <body>
+    <math>
+      <mpadded mathbackground="blue" width="100px" height="50px" depth="50px"
+               lspace="10px" voffset="-15px">
+        <mpadded mathbackground="red" width="20px" height="10px"
+                 depth="10px">
+        </mpadded>
+      </mpadded>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013-ref.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013-ref.html
new file mode 100644
index 00000000000..6ecda3e401c
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded height depth</title>
+    <style type="text/css">
+      div#bigsquare1 {
+          position: absolute;
+          width: 100px;
+          height: 50px;
+          background: blue;
+      }
+
+      div#smallsquare1 {
+          position:absolute;
+          width: 20px;
+          height: 20px;
+          left: 0px;
+          top: 30px;
+          background: red;
+      }
+      /* left = lspace = 0;
+         top = heightBig - heightSmall - voffset;
+             = 50 - 10 - 10*/
+    </style>
+  </head>
+  <body>
+    <div id="bigsquare1">
+      <div id="smallsquare1">
+      </div>
+    </div>
+
+    <div id="bigsquare2">
+      <div id="smallsquare2">
+      </div>
+    </div>
+  </body>
+<html>
diff --git a/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013.html b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013.html
new file mode 100644
index 00000000000..3720911edc3
--- /dev/null
+++ b/tests/wpt/tests/mathml/presentation-markup/mpadded/mpadded-013.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test mpadded height depth</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#inner-box-and-requested-parameters">
+    <meta name="assert" content="Verify basic rendering of mpadded.">
+    <link rel="match" href="mpadded-013-ref.html">
+  </head>
+  <body>
+    <math>
+      <mpadded mathbackground="blue" width="100px" height="50px" depth="0px"
+               lspace="0px" voffset="10px">
+        <mpadded mathbackground="red" width="20px" height="10px"
+                 depth="10px">
+        </mpadded>
+      </mpadded>
+    </math>
+  </body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/href-click-1-ref.html b/tests/wpt/tests/mathml/relations/html5-tree/href-click-001.tentative-ref.html
similarity index 100%
rename from tests/wpt/tests/mathml/relations/html5-tree/href-click-1-ref.html
rename to tests/wpt/tests/mathml/relations/html5-tree/href-click-001.tentative-ref.html
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/href-click-1.html b/tests/wpt/tests/mathml/relations/html5-tree/href-click-001.tentative.html
similarity index 94%
rename from tests/wpt/tests/mathml/relations/html5-tree/href-click-1.html
rename to tests/wpt/tests/mathml/relations/html5-tree/href-click-001.tentative.html
index c3e605cb727..9e40c0b02e9 100644
--- a/tests/wpt/tests/mathml/relations/html5-tree/href-click-1.html
+++ b/tests/wpt/tests/mathml/relations/html5-tree/href-click-001.tentative.html
@@ -5,7 +5,7 @@
 <title>href click</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/#dom-and-javascript">
-<link rel="match" href="href-click-1-ref.html"/>
+<link rel="match" href="href-click-001.tentative-ref.html"/>
 <meta name="assert" content="Verify that a click on a link moves to the target.">
 <script type="text/javascript">
   function test()
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/href-click-2-ref.html b/tests/wpt/tests/mathml/relations/html5-tree/href-click-002.tentative-ref.html
similarity index 100%
rename from tests/wpt/tests/mathml/relations/html5-tree/href-click-2-ref.html
rename to tests/wpt/tests/mathml/relations/html5-tree/href-click-002.tentative-ref.html
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/href-click-2.html b/tests/wpt/tests/mathml/relations/html5-tree/href-click-002.tentative.html
similarity index 95%
rename from tests/wpt/tests/mathml/relations/html5-tree/href-click-2.html
rename to tests/wpt/tests/mathml/relations/html5-tree/href-click-002.tentative.html
index 8ffec61cc7c..bc5b9a00cfa 100644
--- a/tests/wpt/tests/mathml/relations/html5-tree/href-click-2.html
+++ b/tests/wpt/tests/mathml/relations/html5-tree/href-click-002.tentative.html
@@ -5,7 +5,7 @@
 <title>href click</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/#dom-and-javascript">
-<link rel="match" href="href-click-2-ref.html"/>
+<link rel="match" href="href-click-002.tentative-ref.html"/>
 <meta name="assert" content="Verify that a click on an element bubbles to an ancestor link.">
 <script type="text/javascript">
   function test()
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/href-click-3.html b/tests/wpt/tests/mathml/relations/html5-tree/href-click-003.tentative.html
similarity index 100%
rename from tests/wpt/tests/mathml/relations/html5-tree/href-click-3.html
rename to tests/wpt/tests/mathml/relations/html5-tree/href-click-003.tentative.html
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative-ref.html b/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative-ref.html
new file mode 100644
index 00000000000..772fda7002f
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Test link on mtext (reference)</title>
+</head>
+<body>
+  <math xmlns="http://www.w3.org/1998/Math/MathML">
+    <mtext>MathML Link</mtext>
+  </math>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative.html b/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative.html
new file mode 100644
index 00000000000..5f0adc42c70
--- /dev/null
+++ b/tests/wpt/tests/mathml/relations/html5-tree/link-color-001.tentative.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Test link on mtext</title>
+  <link rel="mismatch" href="link-color-001.tentative-ref.html"/>
+  <link rel="help" href="https://github.com/w3c/mathml-core/pull/29"/>
+</head>
+<body>
+  <math xmlns="http://www.w3.org/1998/Math/MathML">
+    <mtext href="www.mozilla.org">MathML Link</mtext>
+  </math>
+</body>
+</html>
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/tabindex-001.html b/tests/wpt/tests/mathml/relations/html5-tree/tabindex-001.tentative.html
similarity index 100%
rename from tests/wpt/tests/mathml/relations/html5-tree/tabindex-001.html
rename to tests/wpt/tests/mathml/relations/html5-tree/tabindex-001.tentative.html
diff --git a/tests/wpt/tests/mathml/relations/html5-tree/tabindex-002.html b/tests/wpt/tests/mathml/relations/html5-tree/tabindex-002.tentative.html
similarity index 100%
rename from tests/wpt/tests/mathml/relations/html5-tree/tabindex-002.html
rename to tests/wpt/tests/mathml/relations/html5-tree/tabindex-002.tentative.html
diff --git a/tests/wpt/tests/notifications/resources/helpers.js b/tests/wpt/tests/notifications/resources/helpers.js
new file mode 100644
index 00000000000..8c30173336e
--- /dev/null
+++ b/tests/wpt/tests/notifications/resources/helpers.js
@@ -0,0 +1,20 @@
+function unregisterAllServiceWorker() {
+  return navigator.serviceWorker.getRegistrations().then(registrations => {
+    return Promise.all(registrations.map(r => r.unregister()));
+  });
+}
+
+async function getActiveServiceWorker(script) {
+  await unregisterAllServiceWorker();
+  const reg = await navigator.serviceWorker.register(script);
+  add_completion_callback(() => reg.unregister());
+  await navigator.serviceWorker.ready;
+  return reg;
+}
+
+
+async function closeAllNotifications() {
+  for (const n of await registration.getNotifications()) {
+    n.close();
+  }
+}
diff --git a/tests/wpt/tests/notifications/shownotification-without-permission.https.window.js b/tests/wpt/tests/notifications/shownotification-without-permission.https.window.js
new file mode 100644
index 00000000000..37b3dbbef66
--- /dev/null
+++ b/tests/wpt/tests/notifications/shownotification-without-permission.https.window.js
@@ -0,0 +1,28 @@
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+// META: script=resources/helpers.js
+
+"use strict";
+
+/** @type {ServiceWorkerRegistration} */
+let registration;
+
+promise_setup(async () => {
+  registration = await getActiveServiceWorker("noop-sw.js");
+});
+
+promise_test(async (t) => {
+  t.add_cleanup(closeAllNotifications);
+
+  try {
+    await test_driver.set_permission({ name: "notifications" }, "prompt");
+  } catch {
+    // Not all implementations support this yet, but it may already be "prompt" to be able to continue
+  }
+
+  assert_equals(Notification.permission, "default", "Should have the default permission to continue");
+
+  await promise_rejects_js(t, TypeError, registration.showNotification(""), "Should throw TypeError");
+  const notifications = await registration.getNotifications();
+  assert_equals(notifications.length, 0, "Should return zero notification");
+}, "showNotificaiton should not be listed with permission=default")
diff --git a/tests/wpt/tests/notifications/shownotification.https.window.js b/tests/wpt/tests/notifications/shownotification.https.window.js
index 4def3271815..3875f5fdb48 100644
--- a/tests/wpt/tests/notifications/shownotification.https.window.js
+++ b/tests/wpt/tests/notifications/shownotification.https.window.js
@@ -1,5 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/resources/testdriver-vendor.js
+// META: script=resources/helpers.js
 // META: script=resources/custom-data.js
 
 "use strict";
@@ -7,29 +8,9 @@
 /** @type {ServiceWorkerRegistration} */
 let registration;
 
-function reset() {
-  return navigator.serviceWorker.getRegistrations().then(registrations => {
-    return Promise.all(registrations.map(r => r.unregister()));
-  });
-}
-
-async function registerSw() {
-  await reset();
-  const reg = await navigator.serviceWorker.register("noop-sw.js");
-  add_completion_callback(() => reg.unregister());
-  await navigator.serviceWorker.ready;
-  return reg;
-}
-
-async function cleanup() {
-  for (const n of await registration.getNotifications()) {
-    n.close();
-  }
-}
-
 promise_setup(async () => {
   await test_driver.set_permission({ name: "notifications" }, "granted");
-  registration = await registerSw();
+  registration = await getActiveServiceWorker("noop-sw.js");
 });
 
 promise_test(async () => {
@@ -38,7 +19,7 @@ promise_test(async () => {
 }, "fetching no notifications");
 
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   await registration.showNotification("");
   const notifications = await registration.getNotifications();
   assert_equals(notifications.length, 1, "Should return one notification");
@@ -46,7 +27,7 @@ promise_test(async t => {
 }, "fetching notification with an empty title");
 
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   await Promise.all([
     registration.showNotification("thunder", { tag: "fire" }),
     registration.showNotification("bird", { tag: "fox" }),
@@ -63,7 +44,7 @@ promise_test(async t => {
 }, "fetching notification by tag filter");
 
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   await Promise.all([
     registration.showNotification("thunder"),
     registration.showNotification("bird"),
@@ -77,7 +58,7 @@ promise_test(async t => {
 // Step 5.2: Let notifications be a list of all notifications in the list of
 // notifications ... whose service worker registration is this ...
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   const another = await navigator.serviceWorker.register("noop-sw.js", { scope: "./scope" });
   await registration.showNotification("Hello");
   const notifications = await another.getNotifications();
@@ -88,7 +69,7 @@ promise_test(async t => {
 // A non-persistent notification is a notification without an associated
 // service worker registration.
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   const nonPersistent = new Notification("Non-persistent");
   t.add_cleanup(() => nonPersistent.close());
   await registration.showNotification("Hello");
@@ -98,7 +79,7 @@ promise_test(async t => {
 }, "fetching only persistent notifications")
 
 promise_test(async t => {
-  t.add_cleanup(cleanup);
+  t.add_cleanup(closeAllNotifications);
   await registration.showNotification("Hello", { data: fakeCustomData });
   const notifications = await registration.getNotifications();
   assert_equals(notifications.length, 1, "Should return a notification");
diff --git a/tests/wpt/tests/orientation-event/device-orientation-events-of-detached-documents.https.html b/tests/wpt/tests/orientation-event/device-orientation-events-of-detached-documents.https.html
index c7ad5ecaefe..f05be6d0d20 100644
--- a/tests/wpt/tests/orientation-event/device-orientation-events-of-detached-documents.https.html
+++ b/tests/wpt/tests/orientation-event/device-orientation-events-of-detached-documents.https.html
@@ -1,5 +1,9 @@
 <!DOCTYPE html>
+<html>
+<head>
 <title>Device sensor event listeners for `window` of detached documents.</title>
+</head>
+<body>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
@@ -7,7 +11,7 @@
 <script src="resources/orientation-event-helpers.js"></script>
 <script>
 
-sensor_test(async t => {
+promise_test(async t => {
   const childFrame = document.createElement('iframe');
   childFrame.src = "/common/blank.html";
   document.body.append(childFrame);
@@ -18,6 +22,15 @@ sensor_test(async t => {
   const contentWindow = childFrame.contentWindow;
   const contentDocument = childFrame.contentDocument;
 
+  await test_driver.set_permission({ name: 'accelerometer' }, 'granted', contentWindow);
+  await test_driver.set_permission({ name: 'gyroscope' }, 'granted', contentWindow);
+  await test_driver.set_permission({ name: 'magnetometer' }, 'granted', contentWindow);
+
+  assert_equals(await contentWindow.DeviceOrientationEvent.requestPermission(),
+                'granted');
+  assert_equals(await contentWindow.DeviceMotionEvent.requestPermission(),
+                'granted');
+
   document.body.remove(childFrame);
 
   assert_not_equals(contentWindow, null);
@@ -31,3 +44,5 @@ sensor_test(async t => {
 }, 'Adding an event listener on the window of a detached document does not crash.');
 
 </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html b/tests/wpt/tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html
index 571a388f644..6d2eee402f7 100644
--- a/tests/wpt/tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html
+++ b/tests/wpt/tests/orientation-event/device-orientation-events-unavailable-on-insecure-origins.html
@@ -23,31 +23,37 @@ if (window.location.origin != get_host_info().HTTP_ORIGIN) {
     assert_false('ondeviceorientationabsolute' in window);
   }, 'Event interfaces and event handlers are not exposed on `window`.');
 
-  sensor_test(async (t, sensorProvider) => {
-    const FAKE_ACCELERATION_DATA = [1, 2, 3];
-    const FAKE_LINEAR_ACCELERATION_DATA = [4, 5, 6];
-    const FAKE_GYROSCOPE_DATA = [7, 8, 9];
+  promise_test(async (t) => {
+    const helper = new SensorTestHelper(t, 'devicemotion');
+    await helper.initializeSensors();
+    const motionData = generateMotionData(1, 2, 3,
+                                          4, 5, 6,
+                                          7, 8, 9);
+    await helper.setData(motionData);
 
     window.ondevicemotion = t.unreached_func("devicemotion event should not be fired.");
-    setMockSensorDataForType(sensorProvider, 'Accelerometer', FAKE_ACCELERATION_DATA);
-    setMockSensorDataForType(sensorProvider, 'LinearAccelerationSensor', FAKE_LINEAR_ACCELERATION_DATA);
-    setMockSensorDataForType(sensorProvider, 'Gyroscope', FAKE_GYROSCOPE_DATA);
 
     await new Promise(r => t.step_timeout(r, 1000));
   }, 'addEventListener() for `devicemotion` does not crash but the handler never fires.');
 
-  sensor_test(async (t, sensorProvider) => {
-    const FAKE_ORIENTATION_DATA = [1.1, 2.2, 3.3];
+  promise_test(async (t) => {
+    const helper = new SensorTestHelper(t, 'deviceorientation');
+    await helper.initializeSensors();
+    const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+    await helper.setData(orientationData);
+
     window.ondeviceorientation = t.unreached_func("deviceorientation event should not be fired.");
-    setMockSensorDataForType(sensorProvider, 'RelativeOrientationEulerAngles', FAKE_ORIENTATION_DATA);
 
     await new Promise(r => t.step_timeout(r, 1000));
   }, 'addEventListener() for `deviceorientation` does not crash but the handler never fires.');
 
-  sensor_test(async (t, sensorProvider) => {
-    const FAKE_ORIENTATION_DATA = [1.1, 2.2, 3.3];
+  promise_test(async (t) => {
+    const helper = new SensorTestHelper(t, 'deviceorientationabsolute');
+    await helper.initializeSensors();
+    const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
+    await helper.setData(orientationData);
+
     window.ondeviceorientationabsolute = t.unreached_func("deviceorientationabsolute event should not be fired.");
-    setMockSensorDataForType(sensorProvider, 'AbsoluteOrientationEulerAngles', FAKE_ORIENTATION_DATA);
 
     await new Promise(r => t.step_timeout(r, 1000));
   }, 'addEventListener() for `deviceorientationabsolute` does not crash but the handler never fires.');
diff --git a/tests/wpt/tests/orientation-event/motion/add-during-dispatch.https.html b/tests/wpt/tests/orientation-event/motion/add-during-dispatch.https.html
index 3a895b9d096..262715ce556 100644
--- a/tests/wpt/tests/orientation-event/motion/add-during-dispatch.https.html
+++ b/tests/wpt/tests/orientation-event/motion/add-during-dispatch.https.html
@@ -7,24 +7,30 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'devicemotion');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const motionData = generateMotionData(1, 2, 3,
                                         4, 5, 6,
                                         7, 8, 9);
-  setMockMotionData(sensorProvider, motionData);
+  await helper.setData(motionData);
 
   return new Promise((resolve, reject) => {
     let result = reject;
     window.addEventListener('devicemotion', event1 => {
       // Now we are in event dispatch.
       assertEventEquals(event1, getExpectedMotionEvent(motionData));
+
       window.addEventListener('devicemotion', event2 => {
-        // Not call until the outer function returns.
+        // Not called until the outer function returns.
         assertEventEquals(event2, getExpectedMotionEvent(motionData));
         result();
-      });
-    });
-    result = resolve;
+      }, {once: true});
+
+      result = resolve;
+    }, {once: true});
   });
 }, 'Test no fire listeners added during event dispatch.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/motion/add-listener-from-callback.https.html b/tests/wpt/tests/orientation-event/motion/add-listener-from-callback.https.html
index 0803d7cc9bf..1f8cca86b23 100644
--- a/tests/wpt/tests/orientation-event/motion/add-listener-from-callback.https.html
+++ b/tests/wpt/tests/orientation-event/motion/add-listener-from-callback.https.html
@@ -7,7 +7,11 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'devicemotion');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const motionData = generateMotionData(1.1, 2.1, 3.1,
                                         1.2, 2.2, 3.2,
                                         1.3, 2.3, 3.3);
@@ -39,7 +43,7 @@ sensor_test(async (t, sensorProvider) => {
     };
   });
 
-  setMockMotionData(sensorProvider, motionData);
+  await helper.setData(motionData);
   window.addEventListener('devicemotion', firstListener);
   await firstPromise;
   await secondPromise;
diff --git a/tests/wpt/tests/orientation-event/motion/multiple-event-listeners.https.html b/tests/wpt/tests/orientation-event/motion/multiple-event-listeners.https.html
index 3b13d632ac8..f94c9d136eb 100644
--- a/tests/wpt/tests/orientation-event/motion/multiple-event-listeners.https.html
+++ b/tests/wpt/tests/orientation-event/motion/multiple-event-listeners.https.html
@@ -7,11 +7,15 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'devicemotion');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const motionData1 = generateMotionData(1, 2, 3,
                                          4, 5, 6,
                                          7, 8, 9);
-  setMockMotionData(sensorProvider, motionData1);
+  await helper.setData(motionData1);
   await Promise.all([
     waitForEvent(getExpectedMotionEvent(motionData1)),
     waitForEvent(getExpectedMotionEvent(motionData1))
@@ -20,7 +24,7 @@ sensor_test(async (t, sensorProvider) => {
   const motionData2 = generateMotionData(11, 12, 13,
                                          14, 15, 16,
                                          17, 18, 19);
-  setMockMotionData(sensorProvider, motionData2);
+  await helper.setData(motionData2);
   await waitForEvent(getExpectedMotionEvent(motionData2));
 }, 'Tests using multiple event handlers for the Device Motion API.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/motion/null-values.https.html b/tests/wpt/tests/orientation-event/motion/null-values.https.html
index b6a2a1622fe..f875afcd64d 100644
--- a/tests/wpt/tests/orientation-event/motion/null-values.https.html
+++ b/tests/wpt/tests/orientation-event/motion/null-values.https.html
@@ -7,7 +7,10 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'devicemotion');
+  await helper.grantSensorsPermissions();
+
   const motionData1 = generateMotionData(1, 2, 3,
                                          null, null, null,
                                          null, null, null);
@@ -24,16 +27,27 @@ sensor_test(async (t, sensorProvider) => {
                                          null, null, null,
                                          null, null, null);
 
-  setMockMotionData(sensorProvider, motionData1);
+  await helper.initializeSensors({disabledSensors: ['accelerometer','gyroscope']});
+  await helper.setData(motionData1);
   await waitForEvent(getExpectedMotionEvent(motionData1));
+  // If test needs to change virtual sensor state from connected to not
+  // connected or vise versa, reset needs to be called. It removes created
+  // virtual sensors and creating them with different connection state is then
+  // possible.
+  await helper.reset();
 
-  setMockMotionData(sensorProvider, motionData2);
+  await helper.initializeSensors({disabledSensors: ['linear-acceleration','gyroscope']});
+  await helper.setData(motionData2);
   await waitForEvent(getExpectedMotionEvent(motionData2));
+  await helper.reset();
 
-  setMockMotionData(sensorProvider, motionData3);
+  await helper.initializeSensors({disabledSensors: ['accelerometer','linear-acceleration']});
+  await helper.setData(motionData3);
   await waitForEvent(getExpectedMotionEvent(motionData3));
+  await helper.reset();
 
-  setMockMotionData(sensorProvider, motionData4);
+  await helper.initializeSensors({disabledSensors: ['accelerometer','linear-acceleration','gyroscope']});
+  await helper.setData(motionData4);
   await waitForEvent(getExpectedMotionEvent(motionData4));
 }, 'Tests using null values for some or all of the event properties.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/motion/page-visibility.https.html b/tests/wpt/tests/orientation-event/motion/page-visibility.https.html
index ea67131151f..2925af93315 100644
--- a/tests/wpt/tests/orientation-event/motion/page-visibility.https.html
+++ b/tests/wpt/tests/orientation-event/motion/page-visibility.https.html
@@ -10,12 +10,16 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'devicemotion');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const motionData = generateMotionData(0, 0, 0,
                                         0, 0, 0,
                                         0, 0, 0);
 
-  setMockMotionData(sensorProvider, motionData);
+  await helper.setData(motionData);
   const event = getExpectedMotionEvent(motionData);
   await waitForEvent(event);
 
diff --git a/tests/wpt/tests/orientation-event/orientation/absolute-fallback.https.html b/tests/wpt/tests/orientation-event/orientation/absolute-fallback.https.html
index 610b1b3c564..27a430728e8 100644
--- a/tests/wpt/tests/orientation-event/orientation/absolute-fallback.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/absolute-fallback.https.html
@@ -7,13 +7,17 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
-  const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
 
   // Make the relative orientation sensor unavailable and set mock data for
   // the absolute one.
-  sensorProvider.setGetSensorShouldFail('RelativeOrientationEulerAngles', true);
-  setMockOrientationData(sensorProvider, orientationData);
-  return waitForEvent(getExpectedAbsoluteOrientationEvent(orientationData));
+  await helper.initializeSensors({enabledSensors: ['absolute-orientation'], disabledSensors: ['relative-orientation']});
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
+
+  // Check sensor values when fallback is activated.
+  await helper.setData(orientationData);
+  await waitForEvent(getExpectedOrientationEvent(orientationData));
 }, 'Tests that deviceorientation falls back to using absolute orientation data if relative is unavailable.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/orientation/add-listener-from-callback.https.html b/tests/wpt/tests/orientation-event/orientation/add-listener-from-callback.https.html
index 8f8cfa29c4f..7f664ab4007 100644
--- a/tests/wpt/tests/orientation-event/orientation/add-listener-from-callback.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/add-listener-from-callback.https.html
@@ -7,19 +7,31 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
-  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
+  const orientationData1 = generateOrientationData(1.1, 2.2, 3.3, false);
+  const orientationData2 = generateOrientationData(11.1, 22.2, 33.3, false);
 
   let firstListener = null;
   let secondListener = null;
   let firstEventCount = 0;
   let firstPromise = new Promise(resolve => {
-    firstListener = (event) => {
+    firstListener = async (event) => {
       assert_true(event instanceof DeviceOrientationEvent, 'event is DeviceOrientationEvent');
       assert_equals(event.type, 'deviceorientation', 'event.type is devicemotion');
       assert_true(event.target instanceof Window, 'event is fired on the window object');
-      assertEventEquals(event, getExpectedOrientationEvent(orientationData));
+      assertEventEquals(event, getExpectedOrientationEvent(orientationData1));
       window.removeEventListener('deviceorientation', firstListener);
+      // Some implementations (e.g. Chromium) work without the call below
+      // because they disconnect from the virtual sensor in the
+      // removeEventListener() call above before connecting again, and in this
+      // case the same orientation data is still considered a significant
+      // change. This is an implementation detail though, so we explicitly pass
+      // different data here.
+      await helper.setData(orientationData2);
       if (++firstEventCount == 1) {
         window.addEventListener('deviceorientation', secondListener);
       }
@@ -30,14 +42,14 @@ sensor_test(async (t, sensorProvider) => {
   let secondEventCount = 0;
   let secondPromise = new Promise(resolve => {
     secondListener = (event) => {
-      assertEventEquals(event, getExpectedOrientationEvent(orientationData));
+      assertEventEquals(event, getExpectedOrientationEvent(orientationData2));
       window.removeEventListener('deviceorientation', secondListener);
       ++secondEventCount;
       resolve(event);
     };
   });
 
-  setMockOrientationData(sensorProvider, orientationData);
+  await helper.setData(orientationData1);
   window.addEventListener('deviceorientation', firstListener);
   await firstPromise;
   await secondPromise;
diff --git a/tests/wpt/tests/orientation-event/orientation/basic-operation-absolute.https.html b/tests/wpt/tests/orientation-event/orientation/basic-operation-absolute.https.html
index 61fd218781d..bebd69b952f 100644
--- a/tests/wpt/tests/orientation-event/orientation/basic-operation-absolute.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/basic-operation-absolute.https.html
@@ -7,18 +7,24 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientationabsolute');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const orientationData = generateOrientationData(1.1, 2.2, 3.3, true);
-  setMockOrientationData(sensorProvider, orientationData);
-  return waitForEvent(getExpectedAbsoluteOrientationEvent(orientationData));
+  await helper.setData(orientationData);
+  await waitForEvent(getExpectedAbsoluteOrientationEvent(orientationData));
 }, 'Tests basic operation of deviceorientationabsolute event using mock data.');
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientationabsolute');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors({disabledSensors: ['absolute-orientation']});
+
   const orientationData = generateOrientationData(null, null, null, true);
   const watcher = new EventWatcher(t, window, ['deviceorientationabsolute']);
 
-  // Make the absolute orientation sensor unavailable
-  sensorProvider.setGetSensorShouldFail('AbsoluteOrientationEulerAngles', true);
   const event = await watcher.wait_for('deviceorientationabsolute');
   assert_equals(event.type, 'deviceorientationabsolute', 'type is set to \"deviceorientationabsolute\"');
   assert_true(event instanceof DeviceOrientationEvent, 'event is DeviceOrientationEvent');
diff --git a/tests/wpt/tests/orientation-event/orientation/basic-operation.https.html b/tests/wpt/tests/orientation-event/orientation/basic-operation.https.html
index 45fe38006ea..c4d26e3744e 100644
--- a/tests/wpt/tests/orientation-event/orientation/basic-operation.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/basic-operation.https.html
@@ -7,19 +7,24 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
-  setMockOrientationData(sensorProvider, orientationData);
-  return waitForEvent(getExpectedOrientationEvent(orientationData));
+  await helper.setData(orientationData);
+  await waitForEvent(getExpectedOrientationEvent(orientationData));
 }, 'Tests basic operation of deviceorientation event using mock data.');
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors({disabledSensors: ['relative-orientation']});
+
   const orientationData = generateOrientationData(null, null, null, false);
   const watcher = new EventWatcher(t, window, ['deviceorientation']);
 
-  // Make the orientation sensor unavailable
-  sensorProvider.setGetSensorShouldFail('AbsoluteOrientationEulerAngles', true);
-  sensorProvider.setGetSensorShouldFail('RelativeOrientationEulerAngles', true);
   const event = await watcher.wait_for('deviceorientation');
   assert_equals(event.type, 'deviceorientation', 'type is set to \"deviceorientation\"');
   assert_true(event instanceof DeviceOrientationEvent, 'event is DeviceOrientationEvent');
diff --git a/tests/wpt/tests/orientation-event/orientation/multiple-event-listeners.https.html b/tests/wpt/tests/orientation-event/orientation/multiple-event-listeners.https.html
index 473b7f88284..a32f9f3a1f6 100644
--- a/tests/wpt/tests/orientation-event/orientation/multiple-event-listeners.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/multiple-event-listeners.https.html
@@ -7,16 +7,21 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const orientationData1 = generateOrientationData(1, 2, 3, false);
-  setMockOrientationData(sensorProvider, orientationData1);
+  await helper.setData(orientationData1);
+
   await Promise.all([
     waitForEvent(getExpectedOrientationEvent(orientationData1)),
     waitForEvent(getExpectedOrientationEvent(orientationData1))
   ]);
 
   const orientationData2 = generateOrientationData(11, 12, 13, false);
-  setMockOrientationData(sensorProvider, orientationData2);
+  await helper.setData(orientationData2);
   await waitForEvent(getExpectedOrientationEvent(orientationData2));
 }, 'Tests using multiple event handlers for the Device Orientation API.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/orientation/no-synchronous-events.https.html b/tests/wpt/tests/orientation-event/orientation/no-synchronous-events.https.html
index e5d7621123f..97dccfbc31a 100644
--- a/tests/wpt/tests/orientation-event/orientation/no-synchronous-events.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/no-synchronous-events.https.html
@@ -7,16 +7,13 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
-  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
 
-  let setMockDataPromise = setMockOrientationData(sensorProvider, orientationData);
-  // Add an empty listener to make sure the event pump is running and the mock
-  // sensor is created and configured. If the pump and fake sensor weren't set
-  // up ahead of time, then the fact that we get an asynchronous event could be
-  // due to the asynchronous set up process.
-  window.addEventListener('deviceorientation', event => {});
-  await setMockDataPromise;
+  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
+  await helper.setData(orientationData);
 
   return new Promise((resolve, reject) => {
     let result = reject;
diff --git a/tests/wpt/tests/orientation-event/orientation/null-values.https.html b/tests/wpt/tests/orientation-event/orientation/null-values.https.html
index f9e4aa64205..c54d73da50c 100644
--- a/tests/wpt/tests/orientation-event/orientation/null-values.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/null-values.https.html
@@ -7,24 +7,21 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
-  const orientationData1 = generateOrientationData(1.1, null, null, false);
-  const orientationData2 = generateOrientationData(null, 2.2, null, false);
-  const orientationData3 = generateOrientationData(null, null, 3.3, false);
-  // The all null event is last because DeviceSingleWindowEventController
-  // will stop updating the sensor when it sees a null event.
-  const orientationData4 = generateOrientationData(null, null, null, false);
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors({disabledSensors: ['absolute-orientation', 'relative-orientation']});
 
-  setMockOrientationData(sensorProvider, orientationData1);
-  await waitForEvent(getExpectedOrientationEvent(orientationData1));
+  const orientationData1 = generateOrientationData(1.1, 2.2, 3.3, false);
+  // Currently it is not possible to set individual values to null because the
+  // parsing algorithms used by
+  // https://w3c.github.io/sensors/#update-virtual-sensor-reading-command
+  // always expect numbers.
+  const orientationData2 = generateOrientationData(null, null, null, false);
 
-  setMockOrientationData(sensorProvider, orientationData2);
+  // An example how setting relative-orientation sensor as disabled will output
+  // null values. Even if we try to set non null values to sensor.
+  await helper.setData(orientationData1);
   await waitForEvent(getExpectedOrientationEvent(orientationData2));
-
-  setMockOrientationData(sensorProvider, orientationData3);
-  await waitForEvent(getExpectedOrientationEvent(orientationData3));
-
-  setMockOrientationData(sensorProvider, orientationData4);
-  await waitForEvent(getExpectedOrientationEvent(orientationData4));
 }, 'Tests using null values for some of the event properties.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/orientation/page-visibility.https.html b/tests/wpt/tests/orientation-event/orientation/page-visibility.https.html
index 37ca3681c91..bcb4beeb8ee 100644
--- a/tests/wpt/tests/orientation-event/orientation/page-visibility.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/page-visibility.https.html
@@ -10,10 +10,14 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const orientationData = generateOrientationData(1, 2, 3, false);
 
-  setMockOrientationData(sensorProvider, orientationData);
+  await helper.setData(orientationData);
   const event = getExpectedOrientationEvent(orientationData);
   await waitForEvent(event);
 
diff --git a/tests/wpt/tests/orientation-event/orientation/updates.https.html b/tests/wpt/tests/orientation-event/orientation/updates.https.html
index c84588d5985..fe1811535b3 100644
--- a/tests/wpt/tests/orientation-event/orientation/updates.https.html
+++ b/tests/wpt/tests/orientation-event/orientation/updates.https.html
@@ -7,13 +7,31 @@
 <script>
 'use strict';
 
-sensor_test(async (t, sensorProvider) => {
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientation');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
   const orientationData1 = generateOrientationData(1.1, 2.2, 3.3, false);
-  setMockOrientationData(sensorProvider, orientationData1);
+  await helper.setData(orientationData1);
   await waitForEvent(getExpectedOrientationEvent(orientationData1));
 
   const orientationData2 = generateOrientationData(11.1, 22.2, 33.3, false);
-  setMockOrientationData(sensorProvider, orientationData2);
+  await helper.setData(orientationData2);
   await waitForEvent(getExpectedOrientationEvent(orientationData2));
-}, 'Tests that updates to the orientation causes new events to fire.');
+}, 'Tests that updates to the relative orientation causes new events to fire.');
+
+promise_test(async (t) => {
+  const helper = new SensorTestHelper(t, 'deviceorientationabsolute');
+  await helper.grantSensorsPermissions();
+  await helper.initializeSensors();
+
+  const orientationData1 = generateOrientationData(1.1, 2.2, 3.3, true);
+  await helper.setData(orientationData1);
+  await waitForEvent(getExpectedAbsoluteOrientationEvent(orientationData1));
+
+  const orientationData2 = generateOrientationData(11.1, 22.2, 33.3, true);
+  await helper.setData(orientationData2);
+  await waitForEvent(getExpectedAbsoluteOrientationEvent(orientationData2));
+}, 'Tests that updates to the absolute orientation causes new events to fire.');
 </script>
diff --git a/tests/wpt/tests/orientation-event/resources/orientation-event-helpers.js b/tests/wpt/tests/orientation-event/resources/orientation-event-helpers.js
index d9ee728d1ef..01e91c62aec 100644
--- a/tests/wpt/tests/orientation-event/resources/orientation-event-helpers.js
+++ b/tests/wpt/tests/orientation-event/resources/orientation-event-helpers.js
@@ -1,135 +1,220 @@
 'use strict';
 
-// These tests rely on the User Agent providing an implementation of
-// platform sensor backends.
+// @class SensorTestHelper
 //
-// In Chromium-based browsers this implementation is provided by a polyfill
-// in order to reduce the amount of test-only code shipped to users. To enable
-// these tests the browser must be run with these options:
+// SensorTestHelper is a helper utilities for orientation event tests.
 //
-//   --enable-blink-features=MojoJS,MojoJSTest
-async function loadChromiumResources() {
-  await import('/resources/chromium/generic_sensor_mocks.js');
-}
+// Usage example with device orientation:
+//   const helper = new SensorTestHelper(t, 'deviceorientation');
+//   await helper.grantSensorsPermissions();
+//   await helper.initializeSensors();
+//   const generatedData = generateOrientationData(1, 2, 3, false);
+//   await helper.setData(generatedData);
+//   await waitForEvent(getExpectedOrientationEvent(generatedData));
+class SensorTestHelper {
+  #eventName;
+  #sensorsEnabledByDefault;
+  #enabledSensors;
+  #disabledSensors;
+  #testObject;
 
-async function initialize_generic_sensor_tests() {
-  if (typeof GenericSensorTest === 'undefined') {
-    const script = document.createElement('script');
-    script.src = '/resources/test-only-api.js';
-    script.async = false;
-    const p = new Promise((resolve, reject) => {
-      script.onload = () => { resolve(); };
-      script.onerror = e => { reject(e); };
-    })
-    document.head.appendChild(script);
-    await p;
+  // @param {object} t - A testharness.js subtest instance.
+  // @param {string} eventName - A name of event. Accepted values are
+  //                             devicemotion, deviceorientation or
+  //                             deviceorientationabsolute.
+  constructor(t, eventName) {
+    this.#eventName = eventName;
+    this.#testObject = t;
+    this.#testObject.add_cleanup(() => this.reset());
 
-    if (isChromiumBased) {
-      await loadChromiumResources();
+    switch (this.#eventName) {
+      case 'devicemotion':
+        this.#sensorsEnabledByDefault =
+            new Set(['accelerometer', 'gyroscope', 'linear-acceleration']);
+        break;
+      case 'deviceorientation':
+        this.#sensorsEnabledByDefault = new Set(['relative-orientation']);
+        break;
+      case 'deviceorientationabsolute':
+        this.#sensorsEnabledByDefault = new Set(['absolute-orientation']);
+        break;
+      default:
+        throw new Error(`Invalid event name ${this.#eventName}`);
     }
   }
-  assert_implements(GenericSensorTest, 'GenericSensorTest is unavailable.');
-  let sensorTest = new GenericSensorTest();
-  await sensorTest.initialize();
-  return sensorTest;
-}
 
-function sensor_test(func, name, properties) {
-  promise_test(async (t) => {
-    t.add_cleanup(() => {
-      if (sensorTest)
-        return sensorTest.reset();
+  // Creates virtual sensors that will be used in tests.
+  //
+  // This function must be called before event listeners are added or calls
+  // to setData() or waitForEvent() are made.
+  //
+  // The |options| parameter is an object that accepts the following entries:
+  // - enabledSensors: A list of virtual sensor names that will be created
+  //                   instead of the default ones for a given event type.
+  // - disabledSensors: A list of virtual sensor names that will be created
+  //                    in a disabled state, so that creating a sensor of
+  //                    a given type is guaranteed to fail.
+  // An Error is thrown if the same name is passed to both options.
+  //
+  // A default list of virtual sensors based on the |eventName| parameter passed
+  // to the constructor is used if |options| is not specified.
+  //
+  // Usage examples
+  // Use default sensors for the given event type:
+  //   await helper.initializeSensors()
+  // Enable specific sensors:
+  //   await helper.initializeSensors({
+  //     enabledSensors: ['accelerometer', 'gyroscope']
+  //   })
+  // Disable some sensors, make some report as not available:
+  //   await helper.initializeSensors({
+  //     disabledSensors: ['gyroscope']
+  //   })
+  // Enable some sensors, make some report as not available:
+  //   await helper.initializeSensors({
+  //     enabledSensors: ['accelerometer'],
+  //     disabledSensors: ['gyroscope']
+  //   })
+  async initializeSensors(options = {}) {
+    this.#disabledSensors = new Set(options.disabledSensors || []);
+    // Check that a sensor name is not in both |options.enabledSensors| and
+    // |options.disabledSensors|.
+    for (const sensor of (options.enabledSensors || [])) {
+      if (this.#disabledSensors.has(sensor)) {
+        throw new Error(`${sensor} can be defined only as enabledSensors or disabledSensors`);
+      }
+    }
+
+    this.#enabledSensors = new Set(options.enabledSensors || this.#sensorsEnabledByDefault);
+    // Remove sensors from enabledSensors that are in disabledSensors
+    for (const sensor of this.#disabledSensors) {
+      this.#enabledSensors.delete(sensor);
+    }
+
+    const createVirtualSensorPromises = [];
+    for (const sensor of this.#enabledSensors) {
+      createVirtualSensorPromises.push(
+          test_driver.create_virtual_sensor(sensor));
+    }
+    for (const sensor of this.#disabledSensors) {
+      createVirtualSensorPromises.push(
+          test_driver.create_virtual_sensor(sensor, {connected: false}));
+    }
+    await Promise.all(createVirtualSensorPromises);
+  }
+
+  // Updates virtual sensor with given data.
+  // @param {object} data - Generated data by generateMotionData or
+  //                        generateOrientationData which is passed to
+  //                        test_driver.update_virtual_sensor().
+  async setData(data) {
+    // WebDriver expects numbers for all values in the readings it receives. We
+    // convert null to zero here, but any other numeric value would work, as it
+    // is the presence of one or more sensors in initializeSensors()'
+    // options.disabledSensors that cause null to be reported in one or more
+    // event attributes.
+    const nullToZero = x => (x === null ? 0 : x);
+    if (this.#eventName === 'devicemotion') {
+      const degToRad = Math.PI / 180;
+      await Promise.all([
+        test_driver.update_virtual_sensor('accelerometer', {
+          'x': nullToZero(data.accelerationIncludingGravityX),
+          'y': nullToZero(data.accelerationIncludingGravityY),
+          'z': nullToZero(data.accelerationIncludingGravityZ),
+        }),
+        test_driver.update_virtual_sensor('linear-acceleration', {
+          'x': nullToZero(data.accelerationX),
+          'y': nullToZero(data.accelerationY),
+          'z': nullToZero(data.accelerationZ),
+        }),
+        test_driver.update_virtual_sensor('gyroscope', {
+          'x': nullToZero(data.rotationRateAlpha) * degToRad,
+          'y': nullToZero(data.rotationRateBeta) * degToRad,
+          'z': nullToZero(data.rotationRateGamma) * degToRad,
+        }),
+      ]);
+    } else {
+      const sensorType =
+          data.absolute ? 'absolute-orientation' : 'relative-orientation';
+      await test_driver.update_virtual_sensor(sensorType, {
+        alpha: nullToZero(data.alpha),
+        beta: nullToZero(data.beta),
+        gamma: nullToZero(data.gamma),
+      });
+    }
+  }
+
+  // Grants permissions to sensors. Depending on |eventName|, requests
+  // permission to use either the DeviceMotionEvent or the
+  // DeviceOrientationEvent API.
+  async grantSensorsPermissions() {
+    // Required by all event types.
+    await test_driver.set_permission({name: 'accelerometer'}, 'granted');
+    await test_driver.set_permission({name: 'gyroscope'}, 'granted');
+    if (this.#eventName == 'deviceorientationabsolute') {
+      await test_driver.set_permission({name: 'magnetometer'}, 'granted');
+    }
+
+    const interfaceName = this.#eventName == 'devicemotion' ?
+        DeviceMotionEvent :
+        DeviceOrientationEvent;
+    await test_driver.bless('enable user activation', async () => {
+      const permission = await interfaceName.requestPermission();
+      assert_equals(permission, 'granted');
     });
+  }
 
-    let sensorTest = await initialize_generic_sensor_tests();
-    return func(t, sensorTest.getSensorProvider());
-  }, name, properties);
+  // Resets SensorTestHelper to default state. Removes all created virtual
+  // sensors.
+  async reset() {
+    const createdVirtualSensors =
+      new Set([...this.#enabledSensors, ...this.#disabledSensors]);
+
+    const sensorRemovalPromises = [];
+    for (const sensor of createdVirtualSensors) {
+      sensorRemovalPromises.push(test_driver.remove_virtual_sensor(sensor));
+    }
+    await Promise.all(sensorRemovalPromises);
+  }
 }
 
-// If two doubles differ by less than this amount, we can consider them
-// to be effectively equal.
-const EPSILON = 1e-8;
-
-function generateMotionData(accelerationX, accelerationY, accelerationZ,
-                            accelerationIncludingGravityX,
-                            accelerationIncludingGravityY,
-                            accelerationIncludingGravityZ,
-                            rotationRateAlpha, rotationRateBeta, rotationRateGamma,
-                            interval = 16) {
-  const motionData = {accelerationX: accelerationX,
-                    accelerationY: accelerationY,
-                    accelerationZ: accelerationZ,
-                    accelerationIncludingGravityX: accelerationIncludingGravityX,
-                    accelerationIncludingGravityY: accelerationIncludingGravityY,
-                    accelerationIncludingGravityZ: accelerationIncludingGravityZ,
-                    rotationRateAlpha: rotationRateAlpha,
-                    rotationRateBeta: rotationRateBeta,
-                    rotationRateGamma: rotationRateGamma,
-                    interval: interval};
+function generateMotionData(
+    accelerationX, accelerationY, accelerationZ, accelerationIncludingGravityX,
+    accelerationIncludingGravityY, accelerationIncludingGravityZ,
+    rotationRateAlpha, rotationRateBeta, rotationRateGamma, interval = 16) {
+  const motionData = {
+    accelerationX: accelerationX,
+    accelerationY: accelerationY,
+    accelerationZ: accelerationZ,
+    accelerationIncludingGravityX: accelerationIncludingGravityX,
+    accelerationIncludingGravityY: accelerationIncludingGravityY,
+    accelerationIncludingGravityZ: accelerationIncludingGravityZ,
+    rotationRateAlpha: rotationRateAlpha,
+    rotationRateBeta: rotationRateBeta,
+    rotationRateGamma: rotationRateGamma,
+    interval: interval
+  };
   return motionData;
 }
 
 function generateOrientationData(alpha, beta, gamma, absolute) {
-  const orientationData = {alpha: alpha,
-                         beta: beta,
-                         gamma: gamma,
-                         absolute: absolute};
+  const orientationData =
+      {alpha: alpha, beta: beta, gamma: gamma, absolute: absolute};
   return orientationData;
 }
 
-async function setMockSensorDataForType(sensorProvider, sensorType, mockDataArray) {
-  const createdSensor = await sensorProvider.getCreatedSensor(sensorType);
-  // We call setSensorReadingAndUpdateSharedBuffer() rather than
-  // setSensorReading() to accommodate Blink's Device Orientation
-  // implementation, which uses its own timer to read the sensor's shared
-  // memory buffer rather than relying on SensorReadingChanged(). This timer
-  // may fire out of sync with the JS timer in MockSensor.startReading(), so
-  // the former might read the shared memory buffer before the latter has
-  // updated |this.buffer_|. We thus immediately update the buffer here
-  // (without consuming data from the ring buffer).
-  return createdSensor.setSensorReadingImmediately([mockDataArray]);
-}
-
-// Device[Orientation|Motion]EventPump treat NaN as a missing value.
-let nullToNan = x => (x === null ? NaN : x);
-
-function setMockMotionData(sensorProvider, motionData) {
-  const degToRad = Math.PI / 180;
-  return Promise.all([
-      setMockSensorDataForType(sensorProvider, "Accelerometer", [
-          nullToNan(motionData.accelerationIncludingGravityX),
-          nullToNan(motionData.accelerationIncludingGravityY),
-          nullToNan(motionData.accelerationIncludingGravityZ),
-      ]),
-      setMockSensorDataForType(sensorProvider, "LinearAccelerationSensor", [
-          nullToNan(motionData.accelerationX),
-          nullToNan(motionData.accelerationY),
-          nullToNan(motionData.accelerationZ),
-      ]),
-      setMockSensorDataForType(sensorProvider, "Gyroscope", [
-          nullToNan(motionData.rotationRateAlpha) * degToRad,
-          nullToNan(motionData.rotationRateBeta) * degToRad,
-          nullToNan(motionData.rotationRateGamma) * degToRad,
-      ]),
-  ]);
-}
-
-function setMockOrientationData(sensorProvider, orientationData) {
-  let sensorType = orientationData.absolute
-      ? "AbsoluteOrientationEulerAngles" : "RelativeOrientationEulerAngles";
-  return setMockSensorDataForType(sensorProvider, sensorType, [
-      nullToNan(orientationData.beta),
-      nullToNan(orientationData.gamma),
-      nullToNan(orientationData.alpha),
-  ]);
-}
-
 function assertEventEquals(actualEvent, expectedEvent) {
+  // If two doubles differ by less than this amount, we can consider them
+  // to be effectively equal.
+  const EPSILON = 1e-8;
+
   for (let key1 of Object.keys(Object.getPrototypeOf(expectedEvent))) {
-    if (typeof expectedEvent[key1] === "object" && expectedEvent[key1] !== null) {
+    if (typeof expectedEvent[key1] === 'object' &&
+        expectedEvent[key1] !== null) {
       assertEventEquals(actualEvent[key1], expectedEvent[key1]);
-    } else if (typeof expectedEvent[key1] === "number") {
-      assert_approx_equals(actualEvent[key1], expectedEvent[key1], EPSILON, key1);
+    } else if (typeof expectedEvent[key1] === 'number') {
+      assert_approx_equals(
+          actualEvent[key1], expectedEvent[key1], EPSILON, key1);
     } else {
       assert_equals(actualEvent[key1], expectedEvent[key1], key1);
     }
@@ -184,6 +269,6 @@ function waitForEvent(expected_event) {
       } catch (e) {
         reject(e);
       }
-    }, { once: true });
+    }, {once: true});
   });
 }
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-in-iframe.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-in-iframe.html
new file mode 100644
index 00000000000..bf5c53566df
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-in-iframe.html
@@ -0,0 +1,57 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+
+<div style="pointer-events: none">
+  <iframe id="iframe"></iframe>
+</div>
+<div style="height: 200vh"></div>
+
+<script>
+  promise_test(async (t) => {
+    let iframe = document.getElementById("iframe");
+    await new Promise((resolve) => {
+      iframe.onload = resolve;
+      iframe.srcdoc = `
+<style>
+  #scroller {
+    overflow: auto;
+    height: 100px;
+    border: 2px solid blue;
+  }
+  .spacer {
+    height: 200vh;
+  }
+</style>
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+`;
+    });
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [
+        window,
+        iframe.contentWindow,
+        iframe.contentDocument.getElementById("scroller")
+      ];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    const actions = new test_driver.Actions().scroll(50, 50, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-scrollbar.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-scrollbar.html
new file mode 100644
index 00000000000..f3dc4d6c7b9
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-scrollbar.html
@@ -0,0 +1,53 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+<style>
+  body {
+    margin: 0;
+  }
+
+  #scroller {
+    overflow: auto;
+    width: 300px;
+    height: 300px;
+    border: 2px solid blue;
+    pointer-events: none;
+  }
+
+  .spacer {
+    height: 200vh;
+  }
+
+</style>
+
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+
+<script>
+  promise_test(async (t) => {
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [window, document.getElementById("scroller")];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    // The cursor is expected on the scrollbar, but if it's not (e.g. if the
+    // scrollbar is overlay and isn't show), the test should still pass.
+    const actions = new test_driver.Actions().scroll(295, 200, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-in-iframe.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-in-iframe.html
new file mode 100644
index 00000000000..e05bb915fba
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-in-iframe.html
@@ -0,0 +1,58 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+
+<div style="pointer-events: none">
+  <iframe id="iframe"></iframe>
+</div>
+<div style="height: 200vh"></div>
+
+<script>
+  promise_test(async (t) => {
+    let iframe = document.getElementById("iframe");
+    await new Promise((resolve) => {
+      iframe.onload = resolve;
+      iframe.srcdoc = `
+<style>
+  #scroller {
+    overflow: auto;
+    height: 100px;
+    border: 2px solid blue;
+    will-change: scroll-position;
+  }
+  .spacer {
+    height: 200vh;
+  }
+</style>
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+`;
+    });
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [
+        window,
+        iframe.contentWindow,
+        iframe.contentDocument.getElementById("scroller")
+      ];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    const actions = new test_driver.Actions().scroll(50, 50, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-scrollbar.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-scrollbar.html
new file mode 100644
index 00000000000..3acf1527b71
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change-scrollbar.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+<style>
+  body {
+    margin: 0;
+  }
+
+  #scroller {
+    overflow: auto;
+    width: 300px;
+    height: 300px;
+    border: 2px solid blue;
+    pointer-events: none;
+    will-change: scroll-position;
+  }
+
+  .spacer {
+    height: 200vh;
+  }
+
+</style>
+
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+
+<script>
+  promise_test(async (t) => {
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [window, document.getElementById("scroller")];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    // The cursor is expected on the scrollbar, but if it's not (e.g. if the
+    // scrollbar is overlay and isn't show), the test should still pass.
+    const actions = new test_driver.Actions().scroll(295, 200, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change.html
new file mode 100644
index 00000000000..1fc3a2fdd05
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll-will-change.html
@@ -0,0 +1,47 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+<style>
+  #scroller {
+    overflow: auto;
+    height: 300px;
+    border: 2px solid blue;
+    pointer-events: none;
+    will-change: scroll-position;
+  }
+
+  .spacer {
+    height: 200vh;
+  }
+
+</style>
+
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+
+<script>
+  promise_test(async (t) => {
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [window, document.getElementById("scroller")];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    const actions = new test_driver.Actions().scroll(50, 200, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll.html b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll.html
new file mode 100644
index 00000000000..e69eaaf61b5
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointer-events-none-skip-scroll.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>pointer-events: none correctly targets scrolls</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/testdriver-actions.js"></script>
+<style>
+  #scroller {
+    overflow: auto;
+    height: 300px;
+    border: 2px solid blue;
+    pointer-events: none;
+  }
+
+  .spacer {
+    height: 200vh;
+  }
+
+</style>
+
+<div id="scroller">
+  <div class="spacer"></div>
+</div>
+<div class="spacer"></div>
+
+<script>
+  promise_test(async (t) => {
+    let scrolled = new Promise((resolve) => {
+      let scrollers = [window, document.getElementById("scroller")];
+      let onscroll = (evt) => {
+        for (const scroller of scrollers) {
+          scroller.removeEventListener("scroll", onscroll);
+        }
+        resolve(evt.target.id || "root");
+      }
+      for (const scroller of scrollers) {
+        scroller.addEventListener("scroll", onscroll);
+      }
+    });
+    const actions = new test_driver.Actions().scroll(50, 200, 0, 50, { duration: 50 });
+    actions.send();
+    assert_equals(await scrolled, "root", "Incorrect element scrolled");
+  }, "Wheel-scroll over pointer-events: none scroller skips that scroller");
+</script>
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointermove_after_pointerup_target_removed.html b/tests/wpt/tests/pointerevents/pointerevent_pointermove_after_pointerup_target_removed.html
new file mode 100644
index 00000000000..7ece87237c6
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointermove_after_pointerup_target_removed.html
@@ -0,0 +1,96 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>After pointerup target is removed, selection should not be updated by pointer move</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";
+
+/**
+ * This behavior is not defined in any spec, but even if browser supports
+ * expanding selection across text nodes with dragging a pointer, it should
+ * not work after pointerup whose target is removed by a pointerup event
+ * listener.
+ */
+
+addEventListener("load", async () => {
+  const span1 = document.querySelector("span");
+  const span2 = span1.nextSibling;
+  const span3 = span2.nextSibling;
+  const button = document.querySelector("button");
+
+  promise_test(async () => {
+    const overlay = document.createElement("div");
+    overlay.className = "overlay";
+    overlay.addEventListener("pointerup", () => {
+      overlay.remove();
+    });
+    document.body.appendChild(overlay);
+    overlay.style.display = "block";
+    await new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(resolve));
+    });
+    await new test_driver.Actions()
+      .pointerMove(10, 10, {origin: span1})
+      .pointerDown()
+      .pointerUp()
+      .pointerMove(10, 10, {origin: span2})
+      .addTick()
+      .pointerMove(10, 10, {origin: span3})
+      .addTick()
+      .send();
+    assert_true(getSelection().isCollapsed);
+  }, "pointermove after pointerup which deletes the overlay should not keep expanding selection");
+
+  promise_test(async () => {
+    const overlay = document.createElement("div");
+    overlay.className = "overlay";
+    overlay.addEventListener("pointerup", () => {
+      button.focus();
+      overlay.remove();
+    });
+    document.body.appendChild(overlay);
+    overlay.style.display = "block";
+    await new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(resolve));
+    });
+    await new test_driver.Actions()
+      .pointerMove(10, 10, {origin: span1})
+      .pointerDown()
+      .pointerUp()
+      .pointerMove(10, 10, {origin: span2})
+      .addTick()
+      .pointerMove(10, 10, {origin: span3})
+      .addTick()
+      .send();
+    assert_true(getSelection().isCollapsed);
+  }, "pointermove after pointerup which deletes the overlay and move focus to the button should not keep expanding selection");
+}, {once: true});
+</script>
+<style>
+div.overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.5);
+  display: none;
+}
+#container {
+  font-size: 32px;
+}
+</style>
+</head>
+<body>
+  <div id="container">
+    <span>abc</span><span>def</span><span>ghi</span><br>
+    <button>button</button>
+  </div>
+</body>
+</html>
diff --git a/tests/wpt/tests/resources/declarative-shadow-dom-polyfill.js b/tests/wpt/tests/resources/declarative-shadow-dom-polyfill.js
deleted file mode 100644
index 99a3e911eb6..00000000000
--- a/tests/wpt/tests/resources/declarative-shadow-dom-polyfill.js
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Polyfill for attaching shadow trees for declarative Shadow DOM for
- * implementations that do not support declarative Shadow DOM.
- *
- * Note: this polyfill will feature-detect the native feature, and do nothing
- *       if supported.
- *
- * See: https://github.com/whatwg/html/pull/5465
- *
- * root: The root of the subtree in which to upgrade shadow roots
- *
- */
-
-function polyfill_declarative_shadow_dom(root) {
-  if (HTMLTemplateElement.prototype.hasOwnProperty('shadowRootMode'))
-    return;
-  root.querySelectorAll("template[shadowrootmode]").forEach(template => {
-    const mode = template.getAttribute("shadowrootmode");
-    const delegatesFocus = template.hasAttribute("shadowrootdelegatesfocus");
-    const shadowRoot = template.parentNode.attachShadow({ mode, delegatesFocus });
-    shadowRoot.appendChild(template.content);
-    template.remove();
-    polyfill_declarative_shadow_dom(shadowRoot);
-  });
-}
diff --git a/tests/wpt/tests/scroll-animations/css/scroll-timeline-name-shadow.html b/tests/wpt/tests/scroll-animations/css/scroll-timeline-name-shadow.html
index f2bea29dd3c..a535b2a44fe 100644
--- a/tests/wpt/tests/scroll-animations/css/scroll-timeline-name-shadow.html
+++ b/tests/wpt/tests/scroll-animations/css/scroll-timeline-name-shadow.html
@@ -6,7 +6,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/web-animations/testcommon.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <main id=main></main>
 <script>
@@ -15,10 +14,6 @@
     main.append(template.content.cloneNode(true));
     main.offsetTop;
   }
-
-  setup(() => {
-    polyfill_declarative_shadow_dom(document);
-  });
 </script>
 <style>
   @keyframes anim {
@@ -39,7 +34,7 @@
   </style>
   <div class=scroller>
     <div class=scroller>
-      <template shadowrootmode=open>
+      <template shadowrootmode=open shadowrootclonable>
         <style>
           :host {
             scroll-timeline: --timeline y;
@@ -76,7 +71,7 @@
     }
   </style>
   <div class=host>
-    <template shadowrootmode=open>
+    <template shadowrootmode=open shadowrootclonable>
       <style>
         ::slotted(.scroller) {
           scroll-timeline: --timeline y;
@@ -113,7 +108,7 @@
     }
   </style>
   <div class=host>
-    <template shadowrootmode=open>
+    <template shadowrootmode=open shadowrootclonable>
       <style>
           /* Not using 'anim' at document scope, due to https://crbug.com/1334534 */
           @keyframes anim2 {
@@ -157,7 +152,7 @@
   </style>
   <div class=scroller>
     <div class=host>
-      <template shadowrootmode=open>
+      <template shadowrootmode=open shadowrootclonable>
         <style>
           div {
             scroll-timeline: --timeline y;
diff --git a/tests/wpt/tests/scroll-animations/css/view-timeline-name-shadow.html b/tests/wpt/tests/scroll-animations/css/view-timeline-name-shadow.html
index bb14618c00a..11902a3c6eb 100644
--- a/tests/wpt/tests/scroll-animations/css/view-timeline-name-shadow.html
+++ b/tests/wpt/tests/scroll-animations/css/view-timeline-name-shadow.html
@@ -6,7 +6,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/web-animations/testcommon.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <main id=main></main>
 <script>
@@ -15,10 +14,6 @@
     main.append(template.content.cloneNode(true));
     main.offsetTop;
   }
-
-  setup(() => {
-    polyfill_declarative_shadow_dom(document);
-  });
 </script>
 <style>
   @keyframes anim {
@@ -41,7 +36,7 @@
   <div class=scroller>
     <div>
       <div class=target>
-        <template shadowrootmode=open>
+        <template shadowrootmode=open shadowrootclonable>
           <style>
             :host {
               view-timeline: --timeline y;
@@ -78,7 +73,7 @@
   </style>
   <div class=scroller>
     <div class=host>
-      <template shadowrootmode=open>
+      <template shadowrootmode=open shadowrootclonable>
         <style>
           ::slotted(.target) {
             view-timeline: --timeline y;
@@ -114,7 +109,7 @@
     }
   </style>
   <div class=host>
-    <template shadowrootmode=open>
+    <template shadowrootmode=open shadowrootclonable>
       <style>
           /* Not using 'anim' at document scope, due to https://crbug.com/1334534 */
           @keyframes anim2 {
@@ -158,7 +153,7 @@
   </style>
   <div class=scroller>
     <div class=host>
-      <template shadowrootmode=open>
+      <template shadowrootmode=open shadowrootclonable>
         <style>
           div {
             view-timeline: --timeline y;
diff --git a/tests/wpt/tests/selection/move-selection-range-into-different-root.tentative.html b/tests/wpt/tests/selection/move-selection-range-into-different-root.tentative.html
new file mode 100644
index 00000000000..d6e4ccda257
--- /dev/null
+++ b/tests/wpt/tests/selection/move-selection-range-into-different-root.tentative.html
@@ -0,0 +1,90 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Updating selection range to outside of scope of the selection should cause the range removed from the selection</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+
+const ArgTypeNodeAndOffset = 0;
+const ArgTypeNode = 1;
+
+const rangeMethods = [
+  { name: "selectNode", type: ArgTypeNode },
+  { name: "selectNodeContents", type: ArgTypeNode },
+  { name: "setEnd", type: ArgTypeNodeAndOffset },
+  { name: "setEndAfter", type: ArgTypeNode },
+  { name: "setEndBefore", type: ArgTypeNode },
+  { name: "setStart", type: ArgTypeNodeAndOffset },
+  { name: "setStartAfter", type: ArgTypeNode },
+  { name: "setStartBefore", type: ArgTypeNode },
+];
+
+function execute(range, rangeMethod, node, offset) {
+  switch (rangeMethod.type) {
+    case ArgTypeNodeAndOffset:
+      range[rangeMethod.name](node, offset);
+      break;
+    case ArgTypeNode:
+      range[rangeMethod.name](node);
+      break;
+    default:
+      throw new Error("Unexpected arg type is set");
+  }
+}
+
+addEventListener("load", () => {
+  function selectDiv() {
+    getSelection().removeAllRanges();
+    const range = document.createRange();
+    range.selectNodeContents(document.getElementById("rangeContainer"));
+    getSelection().addRange(range);
+  }
+  function createDocumentFragment() {
+    const fragment = document.createDocumentFragment();
+    const div = document.createElement("div");
+    div.id = "rangeContainer";
+    div.innerHTML = "<br>";
+    fragment.appendChild(div);
+    return fragment;
+  }
+  for (const rangeMethod of rangeMethods) {
+    test(() => {
+      selectDiv();
+      const fragment = createDocumentFragment();
+      execute(
+        getSelection().getRangeAt(0),
+        rangeMethod,
+        fragment.getElementById("rangeContainer"),
+        0
+      );
+      assert_equals(
+        getSelection().rangeCount,
+        0
+      );
+    }, `Set selection range into a document fragment with ${rangeMethod.name}`);
+    test(() => {
+      selectDiv();
+      const div = document.querySelector("iframe").contentDocument.getElementById("rangeContainer");
+      execute(
+        getSelection().getRangeAt(0),
+        rangeMethod,
+        div,
+        0
+      );
+      assert_equals(
+        getSelection().rangeCount,
+        0
+      );
+    }, `Set selection range into a sub-document with ${rangeMethod.name}`);
+  }
+}, {once: true});
+</script>
+</head>
+<body>
+<div id="rangeContainer"><br></div>
+<iframe srcdoc="<div id='rangeContainer'><br></div>"></iframe>
+</body>
+</html>
diff --git a/tests/wpt/tests/serial/README.md b/tests/wpt/tests/serial/README.md
index 7040cf0a9d0..019eebd06b7 100644
--- a/tests/wpt/tests/serial/README.md
+++ b/tests/wpt/tests/serial/README.md
@@ -1,20 +1,10 @@
 # Web Serial Testing
 
-Automated testing for the [Web Serial API] relies on a test-only interface which
-must be provided by browsers under test. This is similar to [WebUSB] however
-there is no separate specification of the API other than the tests themselves
-and the Chromium implementation.
-
-Tests in this suite include `resources/automation.js` to detect and load the
-test API as needed.
-
-The Chromium implementation is provided by
-`../resources/chromium/fake-serial.js` using [MojoJS].
+Currently Web Serial only provide permission policy and maualy tests. The goal in future is to define test API specification similar to [WebUSB] and provide test-only interface to support more comprehensive tests.
 
 Tests with the "-manual" suffix do not use the test-only interface and expect a
 real hardware device to be connected. The specific characteristics of the device
 are described in each test.
 
-[MojoJS]: https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/testing/web_platform_tests.md#mojojs
-[WebUSB]: ../webusb
+[WebUSB]: webusb
 [Web Serial API]: https://wicg.github.io/serial
diff --git a/tests/wpt/tests/serial/resources/automation.js b/tests/wpt/tests/serial/resources/automation.js
deleted file mode 100644
index e88fdb1a9d2..00000000000
--- a/tests/wpt/tests/serial/resources/automation.js
+++ /dev/null
@@ -1,66 +0,0 @@
-'use strict';
-
-// These tests rely on the User Agent providing an implementation of the
-// FakeSerialService interface which replaces the platform-specific
-// implementation of the Web Serial API with one that can be automated from
-// Javascript for testing purposes.
-//
-// In Chromium-based browsers this implementation is provided by a polyfill
-// in order to reduce the amount of test-only code shipped to users. To enable
-// these tests the browser must be run with these options:
-//
-//   --enable-blink-features=MojoJS,MojoJSTest
-
-let fakeSerialService = undefined;
-
-// Returns a SerialPort instance and associated FakeSerialPort instance.
-async function getFakeSerialPort(fake) {
-  let token = fake.addPort();
-  let fakePort = fake.getFakePort(token);
-
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 1);
-
-  let port = ports[0];
-  assert_true(port instanceof SerialPort);
-
-  return { port, fakePort };
-}
-
-function serial_test(func, name, properties) {
-  promise_test(async (test) => {
-    assert_implements(navigator.serial, 'missing navigator.serial');
-    if (fakeSerialService === undefined) {
-      // Try loading a polyfill for the fake serial service.
-      if (isChromiumBased) {
-        const fakes = await import('/resources/chromium/fake-serial.js');
-        fakeSerialService = fakes.fakeSerialService;
-      }
-    }
-    assert_implements(fakeSerialService, 'missing fakeSerialService after initialization');
-
-    fakeSerialService.start();
-    try {
-      await func(test, fakeSerialService);
-    } finally {
-      fakeSerialService.stop();
-      fakeSerialService.reset();
-    }
-  }, name, properties);
-}
-
-function trustedClick() {
-  return new Promise(resolve => {
-    let button = document.createElement('button');
-    button.textContent = 'click to continue test';
-    button.style.display = 'block';
-    button.style.fontSize = '20px';
-    button.style.padding = '10px';
-    button.onclick = () => {
-      document.body.removeChild(button);
-      resolve();
-    };
-    document.body.appendChild(button);
-    test_driver.click(button);
-  });
-}
diff --git a/tests/wpt/tests/serial/serial-disabled-by-permissions-policy.https.sub.html b/tests/wpt/tests/serial/serial-disabled-by-permissions-policy.https.sub.html
index 251bf84f475..d482b19cae3 100644
--- a/tests/wpt/tests/serial/serial-disabled-by-permissions-policy.https.sub.html
+++ b/tests/wpt/tests/serial/serial-disabled-by-permissions-policy.https.sub.html
@@ -3,7 +3,6 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/test-only-api.js"></script>
-<script src="/serial/resources/automation.js"></script>
 <script src="/permissions-policy/resources/permissions-policy.js"></script>
 <script>
 'use strict';
@@ -15,14 +14,6 @@ const same_origin_worker_frame_src =
 const cross_origin_worker_frame_src = sub + same_origin_worker_frame_src;
 const header = 'Permissions-Policy header serial=()';
 
-async function sleep(timeout) {
-  return new Promise(resolve => {
-    step_timeout(() => {
-      resolve();
-    }, timeout);
-  });
-}
-
 promise_test(() => {
   return navigator.serial.getPorts().then(() => {
     assert_unreached('expected promise to reject with SecurityError');
@@ -55,20 +46,5 @@ async_test(t => {
 fetch_tests_from_worker(new Worker(
     'resources/serial-disabled-by-permissions-policy-worker.js'));
 
-serial_test(async (t, fake) => {
-  let eventWatcher = new EventWatcher(t, navigator.serial, 'connect');
-
-  // This isn't necessary as the expected scenario shouldn't send any mojo
-  // request. However, in order to capture a bug that doesn't reject adding
-  // event listener, time delay here is to allow mojo request to be intercepted
-  // after adding connect event listener.
-  await sleep(100);
-
-  // If device connect event fires, EventWatcher will assert for an unexpected
-  // event.
-  fake.addPort();
-  // Time delay here is to allow event to be fired if any.
-  await sleep(100);
-}, 'Connect event is not fired when serial is disallowed.');
 </script>
 </body>
diff --git a/tests/wpt/tests/serial/serialPort-disconnect-during-abort.https.any.js b/tests/wpt/tests/serial/serialPort-disconnect-during-abort.https.any.js
deleted file mode 100644
index 6df1513c5cb..00000000000
--- a/tests/wpt/tests/serial/serialPort-disconnect-during-abort.https.any.js
+++ /dev/null
@@ -1,29 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  assert_true(port.writable instanceof WritableStream);
-  const writer = port.writable.getWriter();
-
-  await fakePort.readable();
-
-  // Simulate disconnection error.
-  fakePort.simulateDisconnectOnWrite();
-
-  // Much larger than default bufferSize so that the write doesn't complete
-  // synchronously.
-  const data = new Uint8Array(1024);
-  const writePromise = writer.write(data);
-
-  // writer.abort is rejected with NetworkError due to simulated disconnection.
-  await promise_rejects_dom(t, 'NetworkError', writer.abort('Aborting'));
-
-  // writePromise is rejected with "Aborting" due to writer.abort.
-  await promise_rejects_exactly(t, 'Aborting', writePromise);
-
-  await port.close();
-}, 'Disconnect error during abort works correctly');
diff --git a/tests/wpt/tests/serial/serialPort_close.https.any.js b/tests/wpt/tests/serial/serialPort_close.https.any.js
deleted file mode 100644
index ec949a99176..00000000000
--- a/tests/wpt/tests/serial/serialPort_close.https.any.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await promise_rejects_dom(t, 'InvalidStateError', port.close());
-}, 'A SerialPort cannot be closed if it was never opened.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  await port.close();
-  await promise_rejects_dom(t, 'InvalidStateError', port.close());
-}, 'A SerialPort cannot be closed if it is already closed.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  const closePromise = port.close();
-  await promise_rejects_dom(t, 'InvalidStateError', port.close());
-  await closePromise;
-}, 'A SerialPort cannot be closed if it is being closed.');
diff --git a/tests/wpt/tests/serial/serialPort_events.https.any.js b/tests/wpt/tests/serial/serialPort_events.https.any.js
deleted file mode 100644
index fa3db6a3b3e..00000000000
--- a/tests/wpt/tests/serial/serialPort_events.https.any.js
+++ /dev/null
@@ -1,197 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expectedTargets = [navigator.serial];
-
-  const actualTargets = [];
-  function eventHandler(evt) {
-    actualTargets.push(evt.currentTarget);
-
-    if (evt.currentTarget == navigator.serial) {
-      evt.stopPropagation();
-    }
-  }
-
-  targets.forEach((target) => {
-    target.addEventListener('foo', eventHandler, {capture: true});
-    // stopPropagation() during capturing prevents bubbling.
-    target.addEventListener('foo', eventHandler);
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', eventHandler, {capture: true});
-      target.removeEventListener('foo', eventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-
-  assert_array_equals(actualTargets, expectedTargets, 'actualTargets');
-}, 'stopPropagation() during capturing');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expectedTargets = [navigator.serial];
-
-  const actualTargets = [];
-  function eventHandler(evt) {
-    actualTargets.push(evt.currentTarget);
-
-    if (evt.currentTarget == navigator.serial) {
-      evt.cancelBubble = true;
-    }
-  }
-
-  targets.forEach((target) => {
-    target.addEventListener('foo', eventHandler, {capture: true});
-    // Setting cancelBubble during capturing prevents bubbling.
-    target.addEventListener('foo', eventHandler);
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', eventHandler, {capture: true});
-      target.removeEventListener('foo', eventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-
-  assert_array_equals(actualTargets, expectedTargets, 'actualTargets');
-}, 'Set cancelBubble during capturing');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expectedTargets = [port];
-
-  const actualTargets = [];
-  function eventHandler(evt) {
-    actualTargets.push(evt.currentTarget);
-
-    if (evt.currentTarget == port) {
-      evt.stopPropagation();
-    }
-  }
-
-  targets.forEach((target) => {
-    target.addEventListener('foo', eventHandler);
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', eventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-
-  assert_array_equals(actualTargets, expectedTargets, 'actualTargets');
-}, 'stopPropagation() during bubbling');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expectedTargets = [port];
-
-  const actualTargets = [];
-  function eventHandler(evt) {
-    actualTargets.push(evt.currentTarget);
-
-    if (evt.currentTarget == port) {
-      evt.cancelBubble = true;
-    }
-  }
-
-  targets.forEach((target) => {
-    target.addEventListener('foo', eventHandler);
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', eventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-
-  assert_array_equals(actualTargets, expectedTargets, 'actualTargets');
-}, 'Set cancelBubble during bubbling');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expectedTargets = [
-    navigator.serial,
-    port,
-    navigator.serial,
-    port,
-  ];
-  const expectedTypes = [
-    'foo',
-    'bar',
-    'bar',
-    'foo',
-  ];
-
-  const actualTargets = [];
-  const actualTypes = [];
-  function eventHandler(evt) {
-    actualTargets.push(evt.currentTarget);
-    actualTypes.push(evt.type);
-
-    if (evt.currentTarget == navigator.serial && evt.type == 'foo') {
-      port.dispatchEvent(new CustomEvent('bar', {bubbles: true}));
-    }
-  }
-
-  targets.forEach((target) => {
-    target.addEventListener('foo', eventHandler, {capture: true});
-    target.addEventListener('bar', eventHandler);
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', eventHandler, {capture: true});
-      target.removeEventListener('bar', eventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-
-  assert_array_equals(actualTargets, expectedTargets, 'actualTargets');
-  assert_array_equals(actualTypes, expectedTypes, 'actualTypes');
-}, 'An event dispatched in an event handler is propagated before continuing');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const targets = [navigator.serial, port];
-  const expected = [
-    'capturing Serial',
-    'capturing SerialPort',
-    'bubbling SerialPort',
-    'bubbling Serial',
-  ];
-
-  const actual = [];
-  targets.forEach((target) => {
-    const bubblingEventHandler = () => {
-      actual.push(`bubbling ${target.constructor.name}`);
-    };
-    target.addEventListener('foo', bubblingEventHandler);
-    const capturingEventHandler = () => {
-      actual.push(`capturing ${target.constructor.name}`);
-    };
-    target.addEventListener('foo', capturingEventHandler, {capture: true});
-
-    t.add_cleanup(() => {
-      target.removeEventListener('foo', bubblingEventHandler, {capture: true});
-      target.removeEventListener('foo', capturingEventHandler);
-    });
-  });
-
-  port.dispatchEvent(new CustomEvent('foo', {bubbles: true}));
-  assert_array_equals(actual, expected);
-}, 'Capturing and bubbling events delivered to listeners in the expected order');
diff --git a/tests/wpt/tests/serial/serialPort_forget.https.any.js b/tests/wpt/tests/serial/serialPort_forget.https.any.js
deleted file mode 100644
index 8c0d96f6952..00000000000
--- a/tests/wpt/tests/serial/serialPort_forget.https.any.js
+++ /dev/null
@@ -1,43 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.forget();
-  return promise_rejects_dom(
-      t, 'NetworkError', port.open({baudRate: 9600}));
-}, 'open() rejects after forget()');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-  await port.forget();
-  return promise_rejects_dom(t, 'InvalidStateError', port.close());
-}, 'close() rejects after forget()');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-  await port.forget();
-  return promise_rejects_dom(t, 'InvalidStateError', port.setSignals());
-}, 'setSignals() rejects after forget()');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-  await port.forget();
-  return promise_rejects_dom(t, 'InvalidStateError', port.getSignals());
-}, 'getSignals() rejects after forget()');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  const portsBeforeForget = await navigator.serial.getPorts();
-  assert_equals(portsBeforeForget.length, 1);
-  assert_equals(portsBeforeForget[0], port);
-
-  await port.forget();
-
-  const portsAfterForget = await navigator.serial.getPorts();
-  assert_equals(portsAfterForget.length, 0);
-}, 'forget() removes the device from getPorts()');
\ No newline at end of file
diff --git a/tests/wpt/tests/serial/serialPort_getInfo.https.any.js b/tests/wpt/tests/serial/serialPort_getInfo.https.any.js
deleted file mode 100644
index 2e0df3b8bdc..00000000000
--- a/tests/wpt/tests/serial/serialPort_getInfo.https.any.js
+++ /dev/null
@@ -1,24 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  // Wait for getPorts() to resolve in order to ensure that the Mojo client
-  // interface has been configured.
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-
-  [{},
-   {usbVendorId: 1},
-   {usbProductId: 2},
-   {usbVendorId: 1, usbProductId: 2},
-  ].forEach((expectedInfo) => {
-    serial_test(async (t, fake) => {
-      let watcher = new EventWatcher(t, navigator.serial, ['connect']);
-      fake.addPort(expectedInfo);
-      let evt = await watcher.wait_for(['connect']);
-      let info = evt.target.getInfo();
-      assert_object_equals(expectedInfo, info);
-    }, `getInfo() returns ${JSON.stringify(expectedInfo)}`);
-  });
-}, 'getInfo() meta test');
diff --git a/tests/wpt/tests/serial/serialPort_getSignals.https.any.js b/tests/wpt/tests/serial/serialPort_getSignals.https.any.js
deleted file mode 100644
index a570e35987f..00000000000
--- a/tests/wpt/tests/serial/serialPort_getSignals.https.any.js
+++ /dev/null
@@ -1,63 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await promise_rejects_dom(t, 'InvalidStateError', port.getSignals());
-}, 'getSignals() rejects if the port is not open');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  let expectedSignals = {
-    dataCarrierDetect: false,
-    clearToSend: false,
-    ringIndicator: false,
-    dataSetReady: false
-  };
-  fakePort.simulateInputSignals(expectedSignals);
-  let signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals);
-
-  expectedSignals.dataCarrierDetect = true;
-  fakePort.simulateInputSignals(expectedSignals);
-  signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals, 'DCD set');
-
-  expectedSignals.clearToSend = true;
-  fakePort.simulateInputSignals(expectedSignals);
-  signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals, 'CTS set');
-
-  expectedSignals.ringIndicator = true;
-  fakePort.simulateInputSignals(expectedSignals);
-  signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals, 'RI set');
-
-  expectedSignals.dataSetReady = true;
-  fakePort.simulateInputSignals(expectedSignals);
-  signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals, 'DSR set');
-}, 'getSignals() returns the current state of input control signals');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  fakePort.simulateInputSignalFailure(true);
-  await promise_rejects_dom(t, 'NetworkError', port.getSignals());
-
-  fakePort.simulateInputSignalFailure(false);
-  const expectedSignals = {
-    dataCarrierDetect: false,
-    clearToSend: false,
-    ringIndicator: false,
-    dataSetReady: false
-  };
-  const signals = await port.getSignals();
-  assert_object_equals(signals, expectedSignals);
-
-  await port.close();
-}, 'getSignals() rejects on failure');
diff --git a/tests/wpt/tests/serial/serialPort_ondisconnect.https.any.js b/tests/wpt/tests/serial/serialPort_ondisconnect.https.any.js
deleted file mode 100644
index b20f69d265b..00000000000
--- a/tests/wpt/tests/serial/serialPort_ondisconnect.https.any.js
+++ /dev/null
@@ -1,40 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  // Don't listen for 'disconnect' events on navigator.serial so we can listen
-  // for them on each SerialPort instance instead.
-  const eventWatcher = new EventWatcher(t, navigator.serial, ['connect']);
-
-  // Wait for getPorts() to resolve in order to ensure that the Mojo client
-  // interface has been configured.
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-
-  // Add ports one at a time so that we can map tokens to ports.
-  const token1 = fake.addPort();
-  const port1 = (await eventWatcher.wait_for(['connect'])).target;
-  const port1Watcher = new EventWatcher(t, port1, ['disconnect']);
-
-  const token2 = fake.addPort();
-  const port2 = (await eventWatcher.wait_for(['connect'])).target;
-  const port2Watcher = new EventWatcher(t, port2, ['disconnect']);
-
-  fake.removePort(token2);
-  const event1 = await port2Watcher.wait_for(['disconnect']);
-  assert_true(event1 instanceof Event);
-  assert_equals(event1.target, port2);
-
-  ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 1);
-  assert_equals(ports[0], port1);
-
-  fake.removePort(token1);
-  const event2 = await port1Watcher.wait_for(['disconnect']);
-  assert_true(event2 instanceof Event);
-  assert_equals(event2.target, port1);
-
-  ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-}, 'A "disconnect" event is fired on ports when they are removed.');
diff --git a/tests/wpt/tests/serial/serialPort_open.https.any.js b/tests/wpt/tests/serial/serialPort_open.https.any.js
deleted file mode 100644
index ca138770888..00000000000
--- a/tests/wpt/tests/serial/serialPort_open.https.any.js
+++ /dev/null
@@ -1,95 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  return promise_rejects_dom(
-      t, 'InvalidStateError', port.open({baudRate: 9600}));
-}, 'A SerialPort cannot be opened if it is already open.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const firstRequest = port.open({baudRate: 9600});
-  await promise_rejects_dom(
-      t, 'InvalidStateError', port.open({baudRate: 9600}));
-  await firstRequest;
-}, 'Simultaneous calls to open() are disallowed.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await promise_rejects_js(t, TypeError, port.open({}));
-
-  await Promise.all([-1, 0].map(
-      baudRate => {
-          return promise_rejects_js(t, TypeError, port.open({baudRate}))}));
-}, 'Baud rate is required and must be greater than zero.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await Promise.all([-1, 0, 6, 9].map(dataBits => {
-    return promise_rejects_js(
-        t, TypeError, port.open({baudRate: 9600, dataBits}));
-  }));
-
-  await[undefined, 7, 8].reduce(async (previousTest, dataBits) => {
-    await previousTest;
-    await port.open({baudRate: 9600, dataBits});
-    await port.close();
-  }, Promise.resolve());
-}, 'Data bits must be 7 or 8');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await Promise.all([0, null, 'cats'].map(parity => {
-    return promise_rejects_js(
-        t, TypeError, port.open({baudRate: 9600, parity}),
-        `Should reject parity option "${parity}"`);
-  }));
-
-  await[undefined, 'none', 'even', 'odd'].reduce(
-      async (previousTest, parity) => {
-        await previousTest;
-        await port.open({baudRate: 9600, parity});
-        await port.close();
-      },
-      Promise.resolve());
-}, 'Parity must be "none", "even" or "odd"');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await Promise.all([-1, 0, 3, 4].map(stopBits => {
-    return promise_rejects_js(
-        t, TypeError, port.open({baudRate: 9600, stopBits}));
-  }));
-
-  await[undefined, 1, 2].reduce(async (previousTest, stopBits) => {
-    await previousTest;
-    await port.open({baudRate: 9600, stopBits});
-    await port.close();
-  }, Promise.resolve());
-}, 'Stop bits must be 1 or 2');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await promise_rejects_js(
-      t, TypeError, port.open({baudRate: 9600, bufferSize: -1}));
-  await promise_rejects_js(
-      t, TypeError, port.open({baudRate: 9600, bufferSize: 0}));
-}, 'Buffer size must be greater than zero.');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  const bufferSize = 1 * 1024 * 1024 * 1024 /* 1 GiB */;
-  return promise_rejects_js(
-      t, TypeError, port.open({baudRate: 9600, bufferSize}));
-}, 'Unreasonably large buffer sizes are rejected.');
diff --git a/tests/wpt/tests/serial/serialPort_readable_byob.https.any.js b/tests/wpt/tests/serial/serialPort_readable_byob.https.any.js
deleted file mode 100644
index 8672cf7124f..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_byob.https.any.js
+++ /dev/null
@@ -1,65 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-async function readInto(reader, buffer) {
-  let offset = 0;
-  while (offset < buffer.byteLength) {
-    const {value: view, done} =
-        await reader.read(new Uint8Array(buffer, offset));
-    buffer = view.buffer;
-    if (done) {
-      break;
-    }
-    offset += view.byteLength;
-  }
-  return buffer;
-}
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  const bufferSize = 1024;
-  await port.open({baudRate: 9600, bufferSize});
-
-  const reader = port.readable.getReader({mode: 'byob'});
-  assert_true(reader instanceof ReadableStreamBYOBReader);
-
-  await fakePort.writable();
-  const data = new Uint8Array(bufferSize);
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  fakePort.write(data);
-
-  let buffer = new ArrayBuffer(512);
-  buffer = await readInto(reader, buffer);
-  assert_equals(512, buffer.byteLength, 'original size retained');
-  compareArrays(data.subarray(0, 512), new Uint8Array(buffer));
-
-  buffer = await readInto(reader, buffer);
-  assert_equals(512, buffer.byteLength, 'original size retained');
-  compareArrays(data.subarray(512), new Uint8Array(buffer));
-  reader.releaseLock();
-
-  await port.close();
-}, 'Can read specific subsets of the available data');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader({mode: 'byob'});
-  assert_true(reader instanceof ReadableStreamBYOBReader);
-
-  await fakePort.writable();
-  const data = new Uint8Array(1024);
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  fakePort.write(data);
-
-  let buffer = new ArrayBuffer(1024);
-  buffer = await readInto(reader, buffer);
-  compareArrays(data, new Uint8Array(buffer));
-  reader.releaseLock();
-
-  await port.close();
-}, 'Can read a large amount of data over multiple iterations');
diff --git a/tests/wpt/tests/serial/serialPort_readable_cancel.https.any.js b/tests/wpt/tests/serial/serialPort_readable_cancel.https.any.js
deleted file mode 100644
index fd1b08f6e7f..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_cancel.https.any.js
+++ /dev/null
@@ -1,69 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-  const readPromise = reader.read();
-  await reader.cancel();
-  const {value, done} = await readPromise;
-  assert_true(done);
-  assert_equals(undefined, value);
-
-  await port.close();
-}, 'Can cancel while reading');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-  const closed = (async () => {
-    const {value, done} = await reader.read();
-    assert_true(done);
-    assert_equals(undefined, value);
-    reader.releaseLock();
-    await port.close();
-    assert_equals(port.readable, null);
-  })();
-
-  await reader.cancel();
-  await closed;
-}, 'Can close while canceling');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-
-  await fakePort.writable();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  await fakePort.write(data);
-
-  await reader.cancel();
-  await port.close();
-}, 'Cancel discards a small amount of data waiting to be read');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-
-  await fakePort.writable();
-  const data = new Uint8Array(1024);
-  // Writing will fail because there was more data to send than could fit in the
-  // buffer and none of it was read.
-  const writePromise =
-      promise_rejects_dom(t, 'InvalidStateError', fakePort.write(data));
-
-  await reader.cancel();
-  await writePromise;
-
-  await port.close();
-}, 'Cancel discards a large amount of data waiting to be read');
diff --git a/tests/wpt/tests/serial/serialPort_readable_chain.https.any.js b/tests/wpt/tests/serial/serialPort_readable_chain.https.any.js
deleted file mode 100644
index 552567cdfe4..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_chain.https.any.js
+++ /dev/null
@@ -1,30 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size larger than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const decoder = new TextDecoderStream();
-  const streamClosed = port.readable.pipeTo(decoder.writable);
-  const readable = decoder.readable.pipeThrough(new TransformStream())
-                       .pipeThrough(new TransformStream())
-                       .pipeThrough(new TransformStream())
-                       .pipeThrough(new TransformStream());
-  const reader = readable.getReader();
-
-  await fakePort.writable();
-  fakePort.write(new TextEncoder().encode('Hello world!'));
-
-  const {value, done} = await reader.read();
-  assert_false(done);
-  assert_equals('Hello world!', value);
-  await reader.cancel('arbitrary reason');
-  await streamClosed.catch(reason => {
-    assert_equals('arbitrary reason', reason);
-  });
-
-  await port.close();
-}, 'Stream closure is observable through a long chain of transforms');
diff --git a/tests/wpt/tests/serial/serialPort_readable_closeLocked.https.any.js b/tests/wpt/tests/serial/serialPort_readable_closeLocked.https.any.js
deleted file mode 100644
index 21196f758b9..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_closeLocked.https.any.js
+++ /dev/null
@@ -1,17 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  assert_true(port.readable instanceof ReadableStream);
-
-  const reader = port.readable.getReader();
-  await promise_rejects_js(t, TypeError, port.close());
-
-  reader.releaseLock();
-  await port.close();
-  assert_equals(port.readable, null);
-}, 'Port cannot be closed while readable is locked');
diff --git a/tests/wpt/tests/serial/serialPort_readable_disconnect.https.any.js b/tests/wpt/tests/serial/serialPort_readable_disconnect.https.any.js
deleted file mode 100644
index 3532745ae03..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_disconnect.https.any.js
+++ /dev/null
@@ -1,25 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-
-  await fakePort.writable();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  fakePort.write(data);
-  fakePort.simulateDisconnectOnRead();
-
-  const {value, done} = await reader.read();
-  assert_false(done);
-  compareArrays(data, value);
-
-  await promise_rejects_dom(t, 'NetworkError', reader.read());
-  assert_equals(port.readable, null);
-
-  await port.close();
-}, 'Disconnect error closes readable and sets it to null');
diff --git a/tests/wpt/tests/serial/serialPort_readable_largeRead.https.any.js b/tests/wpt/tests/serial/serialPort_readable_largeRead.https.any.js
deleted file mode 100644
index f8087514f71..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_largeRead.https.any.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-
-  await fakePort.writable();
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  fakePort.write(data);
-
-  const value = await readWithLength(reader, data.byteLength);
-  compareArrays(data, value);
-  reader.releaseLock();
-
-  await port.close();
-}, 'Can read a large amount of data');
diff --git a/tests/wpt/tests/serial/serialPort_readable_open.https.any.js b/tests/wpt/tests/serial/serialPort_readable_open.https.any.js
deleted file mode 100644
index 1a12cc2da48..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_open.https.any.js
+++ /dev/null
@@ -1,21 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  assert_equals(port.readable, null);
-
-  await port.open({baudRate: 9600});
-  const readable = port.readable;
-  assert_true(readable instanceof ReadableStream);
-
-  await port.close();
-  assert_equals(port.readable, null);
-
-  const reader = readable.getReader();
-  const {value, done} = await reader.read();
-  assert_true(done);
-  assert_equals(value, undefined);
-}, 'SerialPort.readable is set by open() and closes on port close');
diff --git a/tests/wpt/tests/serial/serialPort_readable_parityError.https.any.js b/tests/wpt/tests/serial/serialPort_readable_parityError.https.any.js
deleted file mode 100644
index 7afd494dc50..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_parityError.https.any.js
+++ /dev/null
@@ -1,52 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-// ParityError is not (as of 2020/03/23) a valid DOMException, so cannot use
-// promise_rejects_dom for it.
-async function promise_rejects_with_parity_error(t, promise) {
-  return promise
-      .then(() => {
-        assert_false('Should have rejected');
-      })
-      .catch(e => {
-        assert_equals(e.constructor, DOMException);
-        assert_equals(e.name, 'ParityError');
-      });
-}
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  let readable = port.readable;
-  let reader = readable.getReader();
-
-  await fakePort.writable();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  fakePort.write(data);
-  fakePort.simulateParityError();
-
-  let {value, done} = await reader.read();
-  assert_false(done);
-  compareArrays(data, value);
-
-  await promise_rejects_with_parity_error(t, reader.read());
-  assert_not_equals(port.readable, readable);
-
-  readable = port.readable;
-  assert_true(readable instanceof ReadableStream);
-  reader = port.readable.getReader();
-
-  await fakePort.writable();
-  fakePort.write(data);
-
-  ({value, done} = await reader.read());
-  assert_false(done);
-  compareArrays(data, value);
-  reader.releaseLock();
-
-  await port.close();
-  assert_equals(port.readable, null);
-}, 'Parity error closes readable and replaces it with a new stream');
diff --git a/tests/wpt/tests/serial/serialPort_readable_pipeThrough.https.any.js b/tests/wpt/tests/serial/serialPort_readable_pipeThrough.https.any.js
deleted file mode 100644
index 13c6d480239..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_pipeThrough.https.any.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size larger than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const decoder = new TextDecoderStream();
-  const streamClosed = port.readable.pipeTo(decoder.writable);
-  const reader = decoder.readable.getReader();
-
-  await fakePort.writable();
-  fakePort.write(new TextEncoder().encode('Hello world!'));
-
-  const {value, done} = await reader.read();
-  assert_false(done);
-  assert_equals('Hello world!', value);
-  await reader.cancel();
-  await streamClosed.catch(reason => {
-    assert_equals(undefined, reason);
-  });
-
-  await port.close();
-}, 'Can pipe readable through a transform stream.')
diff --git a/tests/wpt/tests/serial/serialPort_readable_smallRead.https.any.js b/tests/wpt/tests/serial/serialPort_readable_smallRead.https.any.js
deleted file mode 100644
index b926aa608f3..00000000000
--- a/tests/wpt/tests/serial/serialPort_readable_smallRead.https.any.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size larger than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const reader = port.readable.getReader();
-  assert_true(reader instanceof ReadableStreamDefaultReader);
-
-  await fakePort.writable();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  fakePort.write(data);
-
-  let {value, done} = await reader.read();
-  assert_false(done);
-  compareArrays(data, value);
-  reader.releaseLock();
-
-  await port.close();
-}, 'Can read a small amount of data');
diff --git a/tests/wpt/tests/serial/serialPort_setSignals.https.any.js b/tests/wpt/tests/serial/serialPort_setSignals.https.any.js
deleted file mode 100644
index 27911ab7db5..00000000000
--- a/tests/wpt/tests/serial/serialPort_setSignals.https.any.js
+++ /dev/null
@@ -1,59 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await promise_rejects_dom(t, 'InvalidStateError', port.setSignals({}));
-}, 'setSignals() rejects if the port is not open');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  let expectedSignals = {
-    dataTerminalReady: true,
-    requestToSend: false,
-    break: false
-  };
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'initial');
-
-  await promise_rejects_js(t, TypeError, port.setSignals());
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'no-op');
-
-  await promise_rejects_js(t, TypeError, port.setSignals({}));
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'no-op');
-
-  await port.setSignals({dataTerminalReady: false});
-  expectedSignals.dataTerminalReady = false;
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'clear DTR');
-
-  await port.setSignals({requestToSend: true});
-  expectedSignals.requestToSend = true;
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'set RTS');
-
-  await port.setSignals({break: true});
-  expectedSignals.break = true;
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'set BRK');
-
-  await port.setSignals(
-      {dataTerminalReady: true, requestToSend: false, break: false});
-  expectedSignals.dataTerminalReady = true;
-  expectedSignals.requestToSend = false;
-  expectedSignals.break = false;
-  assert_object_equals(fakePort.outputSignals, expectedSignals, 'invert');
-}, 'setSignals() modifies the state of the port');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  fakePort.simulateOutputSignalFailure(true);
-  await promise_rejects_dom(t, 'NetworkError', port.setSignals({break: true}));
-
-  fakePort.simulateOutputSignalFailure(false);
-  await port.setSignals({break: true});
-  assert_true(fakePort.outputSignals.break);
-
-  await port.close();
-}, 'setSignals() rejects on failure');
diff --git a/tests/wpt/tests/serial/serialPort_writable.https.any.js b/tests/wpt/tests/serial/serialPort_writable.https.any.js
deleted file mode 100644
index 087c8815007..00000000000
--- a/tests/wpt/tests/serial/serialPort_writable.https.any.js
+++ /dev/null
@@ -1,289 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  assert_equals(port.writable, null);
-
-  await port.open({baudRate: 9600});
-  const writable = port.writable;
-  assert_true(writable instanceof WritableStream);
-
-  await port.close();
-  assert_equals(port.writable, null);
-
-  const writer = writable.getWriter();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  await promise_rejects_dom(t, 'InvalidStateError', writer.write(data));
-}, 'open() and close() set and unset SerialPort.writable');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  assert_true(port.writable instanceof WritableStream);
-
-  const writer = port.writable.getWriter();
-  await promise_rejects_js(t, TypeError, port.close());
-
-  writer.releaseLock();
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'Port cannot be closed while writable is locked');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  assert_true(port.writable instanceof WritableStream);
-
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  let writePromise = writer.write(data);
-  writer.releaseLock();
-
-  await fakePort.readable();
-  let {value, done} = await fakePort.read();
-  await writePromise;
-  compareArrays(value, data);
-
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'Can write a small amount of data');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  writer.write(data);
-  writer.releaseLock();
-
-  await fakePort.readable();
-  const value = await fakePort.readWithLength(data.byteLength);
-  compareArrays(data, value);
-
-  await port.close();
-}, 'Can write a large amount of data');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  const writable = port.writable;
-  assert_true(writable instanceof WritableStream);
-  let writer = writable.getWriter();
-
-  await fakePort.readable();
-  fakePort.simulateSystemErrorOnWrite();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  await promise_rejects_dom(t, 'UnknownError', writer.write(data));
-
-  assert_true(port.writable instanceof WritableStream);
-  assert_not_equals(port.writable, writable);
-
-  writer = port.writable.getWriter();
-  let writePromise = writer.write(data);
-  writer.releaseLock();
-  await fakePort.readable();
-  let {value, done} = await fakePort.read();
-  await writePromise;
-  compareArrays(value, data);
-
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'System error closes writable and replaces it with a new stream');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600});
-
-  assert_true(port.writable instanceof WritableStream);
-  const writer = port.writable.getWriter();
-
-  await fakePort.readable();
-  fakePort.simulateDisconnectOnWrite();
-  const data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  await promise_rejects_dom(t, 'NetworkError', writer.write(data));
-  assert_equals(port.writable, null);
-
-  await port.close();
-}, 'Disconnect error closes writable and sets it to null');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600, bufferSize: 64});
-  const originalWritable = port.writable;
-  assert_true(originalWritable instanceof WritableStream);
-
-  let writer = originalWritable.getWriter();
-  let data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
-  // The buffer size is large enough to allow this write to complete without
-  // the data being read from the fake port.
-  await writer.write(data);
-  await writer.abort();
-
-  assert_true(port.writable instanceof WritableStream);
-  assert_true(port.writable !== originalWritable);
-  writer = port.writable.getWriter();
-  data = new Uint8Array([9, 10, 11, 12, 13, 14, 15, 16]);
-  const writePromise = writer.write(data);
-  writer.releaseLock();
-
-  await fakePort.readable();
-  const {value, done} = await fakePort.read();
-  await writePromise;
-  compareArrays(value, data);
-
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'abort() discards the write buffer');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  // Wait for microtasks to execute in order to ensure that the WritableStream
-  // has been set up completely.
-  await Promise.resolve();
-
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  const writePromise =
-      promise_rejects_exactly(t, 'Aborting.', writer.write(data));
-
-  await writer.abort('Aborting.');
-  await writePromise;
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'abort() does not wait for the write buffer to be cleared');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  const closed = (async () => {
-    await promise_rejects_exactly(t, 'Aborting.', writer.write(data));
-    writer.releaseLock();
-    await port.close();
-    assert_equals(port.writable, null);
-  })();
-
-  await writer.abort('Aborting.');
-  await closed;
-}, 'Can close while aborting');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  writer.write(data);
-
-  let readComplete = false;
-  let writePromise = writer.close().then(() => {
-    assert_true(readComplete);
-  });
-
-  await fakePort.readable();
-  let readPromise = fakePort.readWithLength(data.byteLength).then(result => {
-    readComplete = true;
-    return result;
-  });
-  const value = await readPromise;
-  compareArrays(data, value);
-  await writePromise;
-
-  await port.close();
-}, 'close() waits for the write buffer to be cleared');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  // Wait for microtasks to execute in order to ensure that the WritableStream
-  // has been set up completely.
-  await Promise.resolve();
-
-  const data = new Uint8Array(1024);  // Much larger than bufferSize above.
-  for (let i = 0; i < data.byteLength; ++i)
-    data[i] = i & 0xff;
-  const writePromise =
-      promise_rejects_exactly(t, 'Aborting.', writer.write(data));
-  const closePromise = promise_rejects_exactly(t, 'Aborting.', writer.close());
-
-  await writer.abort('Aborting.');
-  await writePromise;
-  await closePromise;
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'Can abort while closing');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  assert_true(port.writable instanceof WritableStream);
-
-  const encoder = new TextEncoderStream();
-  const streamClosed = encoder.readable.pipeTo(port.writable);
-  const writer = encoder.writable.getWriter();
-  const writePromise = writer.write('Hello world!');
-
-  await fakePort.readable();
-  const {value, done} = await fakePort.read();
-  await writePromise;
-  assert_equals('Hello world!', new TextDecoder().decode(value));
-  await writer.close();
-  await streamClosed;
-
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'Can pipe a stream to writable');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-
-  await port.open({baudRate: 9600});
-  assert_true(port.writable instanceof WritableStream);
-
-  const transform = new TransformStream();
-  const readable = transform.readable.pipeThrough(new TextEncoderStream())
-                       .pipeThrough(new TransformStream())
-                       .pipeThrough(new TransformStream())
-                       .pipeThrough(new TransformStream());
-  const streamClosed = readable.pipeTo(port.writable);
-  const writer = transform.writable.getWriter();
-  const writePromise = writer.write('Hello world!');
-
-  await fakePort.readable();
-  const {value, done} = await fakePort.read();
-  await writePromise;
-  assert_equals('Hello world!', new TextDecoder().decode(value));
-  await writer.close();
-  await streamClosed;
-
-  await port.close();
-  assert_equals(port.writable, null);
-}, 'Stream closure is observable through a long chain of transformers');
diff --git a/tests/wpt/tests/serial/serialPort_writable_detachBuffer.https.any.js b/tests/wpt/tests/serial/serialPort_writable_detachBuffer.https.any.js
deleted file mode 100644
index 828e877726b..00000000000
--- a/tests/wpt/tests/serial/serialPort_writable_detachBuffer.https.any.js
+++ /dev/null
@@ -1,48 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-function detachBuffer(buffer) {
-  const channel = new MessageChannel();
-  channel.port1.postMessage('', [buffer]);
-}
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array(64);
-  detachBuffer(data.buffer);
-
-  // Writing a detached buffer is equivalent to writing an empty buffer so this
-  // should trivially succeed.
-  await writer.write(data);
-  writer.releaseLock();
-
-  await port.close();
-}, 'Writing a detached buffer is safe');
-
-serial_test(async (t, fake) => {
-  const {port, fakePort} = await getFakeSerialPort(fake);
-  // Select a buffer size smaller than the amount of data transferred.
-  await port.open({baudRate: 9600, bufferSize: 64});
-
-  // Start writing a buffer much larger than bufferSize above so that it can't
-  // all be transfered in a single operation.
-  const writer = port.writable.getWriter();
-  const data = new Uint8Array(1024);
-  const promise = writer.write(data);
-  writer.releaseLock();
-
-  // Read half of the written data and then detach the buffer.
-  await fakePort.readable();
-  await fakePort.readWithLength(data.byteLength / 2);
-  detachBuffer(data.buffer);
-
-  // When the buffer is detached its length becomes zero and so the write should
-  // succeed but it is undefined how much data was written before that happened.
-  await promise;
-
-  await port.close();
-}, 'Detaching a buffer while writing is safe');
diff --git a/tests/wpt/tests/serial/serial_getPorts.https.any.js b/tests/wpt/tests/serial/serial_getPorts.https.any.js
deleted file mode 100644
index 03ab5f7e266..00000000000
--- a/tests/wpt/tests/serial/serial_getPorts.https.any.js
+++ /dev/null
@@ -1,25 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  fake.addPort();
-  fake.addPort();
-
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 2);
-  assert_true(ports[0] instanceof SerialPort);
-  assert_true(ports[1] instanceof SerialPort);
-}, 'getPorts() returns the set of configured fake ports');
-
-serial_test(async (t, fake) => {
-  fake.addPort();
-
-  let portsFirst = await navigator.serial.getPorts();
-  assert_equals(portsFirst.length, 1, 'first call returns one port');
-  assert_true(portsFirst[0] instanceof SerialPort);
-  let portsSecond = await navigator.serial.getPorts();
-  assert_equals(portsSecond.length, 1, 'second call returns one port');
-  assert_true(portsSecond[0] instanceof SerialPort);
-  assert_true(portsFirst[0] === portsSecond[0]);
-}, 'getPorts() returns the same port objects every time');
diff --git a/tests/wpt/tests/serial/serial_onconnect.https.any.js b/tests/wpt/tests/serial/serial_onconnect.https.any.js
deleted file mode 100644
index e2ff9a0f0a0..00000000000
--- a/tests/wpt/tests/serial/serial_onconnect.https.any.js
+++ /dev/null
@@ -1,29 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const eventWatcher =
-      new EventWatcher(t, navigator.serial, ['connect', 'disconnect']);
-
-  // Wait for getPorts() to resolve in order to ensure that the Mojo client
-  // interface has been configured.
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-
-  fake.addPort();
-  const event1 = await eventWatcher.wait_for(['connect']);
-  assert_true(event1 instanceof Event);
-  assert_true(event1.target instanceof SerialPort);
-
-  fake.addPort();
-  const event2 = await eventWatcher.wait_for(['connect']);
-  assert_true(event2 instanceof Event);
-  assert_true(event2.target instanceof SerialPort);
-  assert_not_equals(event1.target, event2.target);
-
-  ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 2);
-  assert_in_array(event1.target, ports);
-  assert_in_array(event2.target, ports);
-}, 'A "connect" event is fired when ports are added.');
diff --git a/tests/wpt/tests/serial/serial_ondisconnect.https.any.js b/tests/wpt/tests/serial/serial_ondisconnect.https.any.js
deleted file mode 100644
index 583a9ea52c8..00000000000
--- a/tests/wpt/tests/serial/serial_ondisconnect.https.any.js
+++ /dev/null
@@ -1,37 +0,0 @@
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test(async (t, fake) => {
-  const eventWatcher =
-      new EventWatcher(t, navigator.serial, ['connect', 'disconnect']);
-
-  // Wait for getPorts() to resolve in order to ensure that the Mojo client
-  // interface has been configured.
-  let ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-
-  // Add ports one at a time so that we can map tokens to ports.
-  const token1 = fake.addPort();
-  const port1 = (await eventWatcher.wait_for(['connect'])).target;
-
-  const token2 = fake.addPort();
-  const port2 = (await eventWatcher.wait_for(['connect'])).target;
-
-  fake.removePort(token2);
-  const event1 = await eventWatcher.wait_for(['disconnect']);
-  assert_true(event1 instanceof Event);
-  assert_equals(event1.target, port2);
-
-  ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 1);
-  assert_equals(ports[0], port1);
-
-  fake.removePort(token1);
-  const event2 = await eventWatcher.wait_for(['disconnect']);
-  assert_true(event2 instanceof Event);
-  assert_equals(event2.target, port1);
-
-  ports = await navigator.serial.getPorts();
-  assert_equals(ports.length, 0);
-}, 'A "disconnect" event is fired when ports are added.');
diff --git a/tests/wpt/tests/serial/serial_requestPort.https.window.js b/tests/wpt/tests/serial/serial_requestPort.https.window.js
deleted file mode 100644
index 4edcfa6a46d..00000000000
--- a/tests/wpt/tests/serial/serial_requestPort.https.window.js
+++ /dev/null
@@ -1,66 +0,0 @@
-// META: script=/resources/testdriver.js
-// META: script=/resources/testdriver-vendor.js
-// META: script=/resources/test-only-api.js
-// META: script=/serial/resources/common.js
-// META: script=resources/automation.js
-
-serial_test((t, fake) => {
-  return promise_rejects_dom(
-      t, 'SecurityError', navigator.serial.requestPort());
-}, 'requestPort() rejects without a user gesture');
-
-serial_test(async (t, fake) => {
-  await trustedClick();
-  return promise_rejects_dom(
-      t, 'NotFoundError', navigator.serial.requestPort());
-}, 'requestPort() rejects if no port has been selected');
-
-serial_test(async (t, fake) => {
-  let token = fake.addPort();
-  fake.setSelectedPort(token);
-
-  await trustedClick();
-  let port = await navigator.serial.requestPort();
-  assert_true(port instanceof SerialPort);
-}, 'requestPort() returns the selected port');
-
-serial_test(async (t, fake) => {
-  let token = fake.addPort();
-  fake.setSelectedPort(token);
-
-  await trustedClick();
-  let firstPort = await navigator.serial.requestPort();
-  assert_true(firstPort instanceof SerialPort);
-  let secondPort = await navigator.serial.requestPort();
-  assert_true(secondPort instanceof SerialPort);
-  assert_true(firstPort === secondPort);
-}, 'requestPort() returns the same port object every time');
-
-serial_test(async (t, fake) => {
-  let token = fake.addPort();
-  fake.setSelectedPort(token);
-
-  await trustedClick();
-  let port = await navigator.serial.requestPort({filters: []});
-  assert_true(port instanceof SerialPort);
-}, 'An empty list of filters is valid');
-
-serial_test(async (t, fake) => {
-  let token = fake.addPort();
-  fake.setSelectedPort(token);
-
-  await trustedClick();
-  return promise_rejects_js(t, TypeError, navigator.serial.requestPort({
-    filters: [{}],
-  }));
-}, 'An empty filter is not valid');
-
-serial_test(async (t, fake) => {
-  let token = fake.addPort();
-  fake.setSelectedPort(token);
-
-  await trustedClick();
-  return promise_rejects_js(t, TypeError, navigator.serial.requestPort({
-    filters: [{usbProductId: 0x0001}],
-  }));
-}, 'requestPort() requires a USB vendor ID if a product ID specified');
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
index c2bcfce67c5..d30d41b44e2 100644
--- 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
@@ -4,4 +4,8 @@ import time
 def main(request, response):
     if 'server_slow' in request.url_parts.query:
         time.sleep(0.2)
+    if 'server_no_content' in request.url_parts.query:
+        return 204, [(b'Content-Type', b'text/plain')], u'Network with %s request' % request.method
+    if 'server_not_found' in request.url_parts.query:
+        return 404, [(b'Content-Type', b'text/plain')], u'Not Found'
     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/static-router-no-fetch-handler.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-no-fetch-handler.https.html
index 2646414f1a4..e98dd08a90a 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-no-fetch-handler.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-no-fetch-handler.https.html
@@ -25,7 +25,14 @@ promise_test(async t => {
   const {contentWindow} = await createIframe(t, `resources/${CACHED_FILE}`);
   assert_equals(contentWindow.document.body.innerText, "From cache");
 
-  // TODO: Matched with the subreosurce load.
+  // Matched with the subreosurce load.
+  const response = await contentWindow.fetch(CACHED_FILE);
+  assert_equals(response.status, 200);
+  assert_equals(await response.text(), "From cache");
+
+  // Both requests are served from cache.
+  const {requests} = await get_info_from_worker(worker);
+  assert_equals(requests.length, 0);
 }, 'The router rule is evaluated without fetch handlers in service worker');
 
 promise_test(async t => {
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
index de31f6c53ff..0dad64ad992 100644
--- 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
@@ -61,5 +61,31 @@ promise_test(async t => {
   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');
+
+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=${rnd}&sw_slow&server_no_content`);
+  assert_equals(response.status, 204);
+  // Ensure the fetch handler is also executed.
+  const {requests}  = await get_info_from_worker(worker);
+  assert_equals(requests.length, 2);
+}, 'Subresource load matched the rule with race-network-and-fetch-handler source, and the server reseponse with 204 response is faster than the fetch handler');
+
+
+promise_test(async t => {
+  const rnd = randomString();
+  const worker = await registerAndActivate(t, ROUTER_KEY, SW_SRC);
+  const iframe = await createIframe(t, FRAME_SRC);
+  const response = await iframe.contentWindow.fetch(`?nonce=${rnd}&sw_slow&server_not_found`);
+  // Expect the response from the network request was faster, but the result was 404.
+  // So, the fetch handler result will be used instead.
+  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 server reseponse is faster than the fetch handler, but not found');
 </script>
 </body>
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-available-to-element-internals.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-available-to-element-internals.html
new file mode 100644
index 00000000000..16fe6fd1d52
--- /dev/null
+++ b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-available-to-element-internals.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Declarative Shadow DOM</title>
+<link rel="author" href="mailto:avandolder@mozilla.com">
+<link rel="help" href="https://html.spec.whatwg.org/#parsing-main-inhead:available-to-element-internals">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<custom-element>
+    <template shadowrootmode="open">
+    </template>
+</custom-element>
+
+<script>
+    let elementInternals;
+    customElements.define("custom-element", class extends HTMLElement {
+        constructor() {
+            super();
+            elementInternals = this.attachInternals();
+        }
+    });
+
+    window.onload = () => {
+        test(() => {
+            assert_true(!!elementInternals);
+            assert_true(!!elementInternals.shadowRoot);
+            assert_equals(elementInternals.shadowRoot, document.querySelector("custom-element").shadowRoot);
+        }, "Declarative Shadow DOM: shadow root should be available to element internals");
+    };
+</script>
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
index 8799978804a..8bc6bec5f50 100644
--- a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
+++ b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
@@ -141,6 +141,28 @@ test(() => {
   assert_true(!!host.shadowRoot,"No shadow root found");
   assert_false(host.shadowRoot.delegatesFocus,"delegatesFocus should be false without the shadowrootdelegatesfocus attribute");
 }, 'Declarative Shadow DOM: delegates focus attribute');
+
+test(() => {
+  const div = document.createElement('div');
+  div.setHTMLUnsafe(`
+    <div id="host">
+      <template shadowrootmode="open" shadowrootclonable>
+      </template>
+    </div>
+    `);
+  var host = div.querySelector('#host');
+  assert_true(!!host.shadowRoot,"No shadow root found");
+  assert_true(host.shadowRoot.clonable,"clonable should be true");
+  div.setHTMLUnsafe(`
+    <div id="host">
+      <template shadowrootmode="open">
+      </template>
+    </div>
+    `);
+  host = div.querySelector('#host');
+  assert_true(!!host.shadowRoot,"No shadow root found");
+  assert_false(host.shadowRoot.clonable,"clonable should be false without the shadowrootclonable attribute");
+}, 'Declarative Shadow DOM: clonable attribute');
 </script>
 
 <div id="multi-host" style="display:none">
@@ -168,7 +190,7 @@ test(() => {
 
 <template id="template-containing-shadow">
   <div class="innerdiv">
-    <template shadowrootmode=open>Content</template>
+    <template shadowrootmode=open shadowrootclonable>Content</template>
   </div>
 </template>
 <script>
@@ -205,13 +227,13 @@ test(() => {
   assert_equals(innerDiv.querySelector('template'), null, "No leftover template node");
   assert_not_equals(shadowRoot1,shadowRoot3,'Should not get back the same shadow root');
 
-}, 'Declarative Shadow DOM: template containing declarative shadow root');
+}, 'Declarative Shadow DOM: template containing declarative shadow root (with shadowrootclonable)');
 </script>
 
 <template id="template-containing-deep-shadow">
   <div><div><div><div><div>
     <div class="innerdiv">
-      <template shadowrootmode=open>Content</template>
+      <template shadowrootmode=open shadowrootclonable>Content</template>
     </div>
   </div></div></div></div></div>
 </template>
@@ -230,7 +252,7 @@ test(() => {
   <div>
     <template id="inner-template">
       <div class="innerdiv">
-        <template shadowrootmode=open>Content</template>
+        <template shadowrootmode=open shadowrootclonable>Content</template>
       </div>
     </template>
   </div>
@@ -249,7 +271,7 @@ test(() => {
 
 <template id="template-containing-ua-shadow">
   <div class="innerdiv">
-    <template shadowrootmode=open>
+    <template shadowrootmode=open shadowrootclonable>
       <video></video> <!--Assumed to have UA shadow root-->
     </template>
   </div>
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 5a992c6c69d..69f5c0f077a 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
@@ -49,9 +49,9 @@ test((t) => {
 </script>
 
 <div id=open2>
-  <template shadowrootmode=open shadowrootdelegatesfocus>
-    Open, delegates focus (not the default),
-    named slot assignment (the default), clonable (the default for declarative)
+  <template shadowrootmode=open shadowrootdelegatesfocus shadowrootclonable>
+    Open, delegates focus (not the default), clonable (not the default)
+    named slot assignment (the default)
   </template>
 </div>
 
@@ -66,11 +66,9 @@ test((t) => {
   assert_throws_dom("NotSupportedError",() => {
     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');
+  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", clonable: true}); // Shouldn't throw
diff --git a/tests/wpt/tests/shadow-dom/declarative/gethtml.tentative.html b/tests/wpt/tests/shadow-dom/declarative/gethtml.tentative.html
index 564caaa97e8..c48230c1701 100644
--- a/tests/wpt/tests/shadow-dom/declarative/gethtml.tentative.html
+++ b/tests/wpt/tests/shadow-dom/declarative/gethtml.tentative.html
@@ -9,7 +9,7 @@
 <body>
 
 <script>
-function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, declarativeShadowDom, mode, delegatesFocus, serializable) {
+function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, declarativeShadowDom, mode, delegatesFocus, serializable, clonable) {
   const t = test(t => {
     // Create and attach element
     let wrapper;
@@ -27,7 +27,7 @@ function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, d
 
     let shadowRoot;
     const isOpen = mode === 'open';
-    let initDict = {mode: mode, delegatesFocus: delegatesFocus};
+    let initDict = {mode: mode, delegatesFocus: delegatesFocus, clonable};
     let expectedSerializable = null;
     switch (serializable) {
       case undefined: expectedSerializable = false; break;
@@ -37,9 +37,10 @@ function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, d
     }
     const delegatesAttr = delegatesFocus ? ' shadowrootdelegatesfocus=""' : '';
     const serializableAttr = expectedSerializable ? ' serializable=""' : '';
+    const clonableAttr = clonable ? ' shadowrootclonable=""' : '';
 
     if (allowsShadowDom && declarativeShadowDom) {
-      const html = `<${elementType}><template shadowrootmode=${mode}${delegatesAttr}${serializableAttr}>`;
+      const html = `<${elementType}><template shadowrootmode=${mode}${delegatesAttr}${serializableAttr}${clonableAttr}>`;
       wrapper.setHTMLUnsafe(html);
       if (isOpen) {
         shadowRoot = wrapper.firstElementChild.shadowRoot;
@@ -58,11 +59,12 @@ function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, d
     assert_true(!allowsShadowDom || !!shadowRoot);
 
     if (allowsShadowDom) {
-      const correctShadowHtml = `<template shadowrootmode="${mode}"${delegatesAttr}${serializableAttr}><slot></slot></template>`;
+      const correctShadowHtml = `<template shadowrootmode="${mode}"${delegatesAttr}${serializableAttr}${clonableAttr}><slot></slot></template>`;
       const correctHtml = `<${elementType}>${correctShadowHtml}</${elementType}>`;
       assert_equals(shadowRoot.mode,mode);
       assert_equals(shadowRoot.delegatesFocus,delegatesFocus);
       assert_equals(shadowRoot.serializable,expectedSerializable);
+      assert_equals(shadowRoot.clonable,clonable);
       shadowRoot.appendChild(document.createElement('slot'));
       const emptyElement = `<${elementType}></${elementType}>`;
       if (isOpen) {
@@ -91,7 +93,7 @@ function testElementType(allowsShadowDom, elementType, runGetHTMLOnShadowRoot, d
     // ...and that the default for includeShadowRoots is false.
     assert_equals(wrapper.getHTML(),wrapper.innerHTML,'The default for includeShadowRoots should be false');
 
-  }, `${runGetHTMLOnShadowRoot ? 'ShadowRoot' : 'Element'}.getHTML() on <${elementType}>${allowsShadowDom ? `, with ${declarativeShadowDom ? 'declarative' : 'imperative'} shadow, mode=${mode}, delegatesFocus=${delegatesFocus}, serializable=${serializable}.` : ''}`);
+  }, `${runGetHTMLOnShadowRoot ? 'ShadowRoot' : 'Element'}.getHTML() on <${elementType}>${allowsShadowDom ? `, with ${declarativeShadowDom ? 'declarative' : 'imperative'} shadow, mode=${mode}, delegatesFocus=${delegatesFocus}, serializable=${serializable}, clonable=${clonable}.` : ''}`);
 }
 
 function runAllTests() {
@@ -103,9 +105,11 @@ function runAllTests() {
       if (allowsShadowDom) {
         for (const declarativeShadowDom of [false, true]) {
           for (const delegatesFocus of [false, true]) {
-            for (const mode of ['open', 'closed']) {
-              for (const serializable of [undefined, 'false', 'true']) {
-                testElementType(true, elementName, runGetHTMLOnShadowRoot, declarativeShadowDom, mode, delegatesFocus, serializable);
+            for (const clonable of [false, true]) {
+              for (const mode of ['open', 'closed']) {
+                for (const serializable of [undefined, 'false', 'true']) {
+                  testElementType(true, elementName, runGetHTMLOnShadowRoot, declarativeShadowDom, mode, delegatesFocus, serializable, clonable);
+                }
               }
             }
           }
diff --git a/tests/wpt/tests/shadow-dom/focus-navigation/focus-nested-slots.html b/tests/wpt/tests/shadow-dom/focus-navigation/focus-nested-slots.html
index 8c7c1d1a808..85d784bc04b 100644
--- a/tests/wpt/tests/shadow-dom/focus-navigation/focus-nested-slots.html
+++ b/tests/wpt/tests/shadow-dom/focus-navigation/focus-nested-slots.html
@@ -7,7 +7,6 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/resources/testdriver-actions.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="resources/shadow-dom.js"></script>
 <script src="resources/focus-utils.js"></script>
 
@@ -27,7 +26,6 @@
 <script>
 
 promise_test(async () => {
-  polyfill_declarative_shadow_dom(document);
   div1.focus();
   assert_equals(document.activeElement, div1);
 
diff --git a/tests/wpt/tests/shadow-dom/focus-navigation/focus-reverse-unassignable-slot.html b/tests/wpt/tests/shadow-dom/focus-navigation/focus-reverse-unassignable-slot.html
index 5d7f332b854..ddb72bdfc39 100644
--- a/tests/wpt/tests/shadow-dom/focus-navigation/focus-reverse-unassignable-slot.html
+++ b/tests/wpt/tests/shadow-dom/focus-navigation/focus-reverse-unassignable-slot.html
@@ -7,7 +7,6 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/resources/testdriver-actions.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 <script src="resources/shadow-dom.js"></script>
 <script src="resources/focus-utils.js"></script>
 
@@ -25,7 +24,6 @@
 
 <script>
 promise_test(async () => {
-  polyfill_declarative_shadow_dom(document);
   input2.focus();
   assert_equals(document.activeElement, input2);
 
diff --git a/tests/wpt/tests/shadow-dom/focus-within-shadow.html b/tests/wpt/tests/shadow-dom/focus-within-shadow.html
index e65165a786d..c0a1e624fb7 100644
--- a/tests/wpt/tests/shadow-dom/focus-within-shadow.html
+++ b/tests/wpt/tests/shadow-dom/focus-within-shadow.html
@@ -4,7 +4,6 @@
 <link rel="help" href="https://crbug.com/1300584">
 <script src='/resources/testharness.js'></script>
 <script src='/resources/testharnessreport.js'></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <div id=host>
   <template shadowrootmode=open>
@@ -15,9 +14,6 @@
 
 <script>
   const host = document.getElementById('host');
-  setup(() => {
-    polyfill_declarative_shadow_dom(host);
-  });
   test(() => {
     const shadowButton = host.shadowRoot.querySelector('button');
     shadowButton.focus();
diff --git a/tests/wpt/tests/shadow-dom/offsetTop-offsetLeft-across-shadow-boundaries.html b/tests/wpt/tests/shadow-dom/offsetTop-offsetLeft-across-shadow-boundaries.html
index 50a85afcbc1..27b1faa1710 100644
--- a/tests/wpt/tests/shadow-dom/offsetTop-offsetLeft-across-shadow-boundaries.html
+++ b/tests/wpt/tests/shadow-dom/offsetTop-offsetLeft-across-shadow-boundaries.html
@@ -2,7 +2,6 @@
 <link rel=author href="mailto:jarhar@chromium.org">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
 
 <style>
 .box {
@@ -81,7 +80,6 @@
 </div>
 
 <script>
-polyfill_declarative_shadow_dom(document);
 test(() => {
   assert_equals(target1.offsetTop, 38);
 }, 'Verifies that HTMLElement.offsetTop accounts for shadow boundaries.');
diff --git a/tests/wpt/tests/shadow-dom/shadow-root-clonable.html b/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
index 6272d11403f..a8d4a4ca516 100644
--- a/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
+++ b/tests/wpt/tests/shadow-dom/shadow-root-clonable.html
@@ -47,14 +47,26 @@ test(() => {
   div.setHTMLUnsafe('<div><template shadowrootmode=open><input></template></div>');
   const root = div.firstElementChild.shadowRoot;
   assert_true(!!root);
-  assert_true(root.clonable, "clonable is automatically true for declarative shadow root");
+  assert_false(root.clonable, "clonable is *not* automatically true for declarative shadow root");
+
+  const clone = div.cloneNode(true);
+  const clonedRoot = clone.firstElementChild.shadowRoot;
+  assert_true(!clonedRoot,'no shadow root gets cloned');
+}, "declarative shadow roots do *not* get clonable: true automatically");
+
+test(() => {
+  const div = document.createElement("div");
+  div.setHTMLUnsafe('<div><template shadowrootmode=open shadowrootclonable><input></template></div>');
+  const root = div.firstElementChild.shadowRoot;
+  assert_true(!!root);
+  assert_true(root.clonable, "clonable gets added when shadowrootclonable is present");
 
   const clone = div.cloneNode(true);
   const clonedRoot = clone.firstElementChild.shadowRoot;
   assert_true(!!clonedRoot);
   assert_equals(clonedRoot.children.length, 1, "children count");
   assert_equals(clonedRoot.children[0].localName, "input", "children content");
-}, "declarative shadow roots get clonable: true automatically");
+}, "declarative shadow roots can opt in to clonable with shadowrootclonable");
 </script>
 
 <template id="test">
@@ -70,8 +82,6 @@ test(() => {
   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");
+  assert_true(!clonedRoot,'no shadow root gets cloned');
+}, "declarative shadow roots inside templates do *not* get cloned automatically");
 </script>
diff --git a/tests/wpt/tests/shared-storage-selecturl-limit/select-url-limit-multiple-worklets.tentative.https.sub.html b/tests/wpt/tests/shared-storage-selecturl-limit/select-url-limit-multiple-worklets.tentative.https.sub.html
new file mode 100644
index 00000000000..c0eedc6f5fa
--- /dev/null
+++ b/tests/wpt/tests/shared-storage-selecturl-limit/select-url-limit-multiple-worklets.tentative.https.sub.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage-selecturl-limit/resources/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestorKey = token();
+  const perOriginBitLimit = 6;
+  const numUrls = 8;
+  const urls = generateUrls(numUrls, "/shared-storage/resources/frame",
+                            [ancestorKey]);
+  const bitsPerCall = Math.log2(numUrls);
+
+  for (let i = 0; i < Math.floor(perOriginBitLimit / bitsPerCall); ++i) {
+    let worklet = await sharedStorage.createWorklet("/shared-storage/resources/simple-module.js");
+    let config = await worklet.selectURL(
+      "test-url-selection-operation", urls,
+      {data: {'mockResult': 1}, keepAlive: true, resolveToConfig: true});
+    assert_true(config instanceof FencedFrameConfig);
+    attachFencedFrame(config, 'opaque-ads');
+    const result = await nextValueFromServer(ancestorKey);
+    assert_equals(result, "frame1_loaded",
+                 `for index ${i} when budget should remain;`);
+  }
+
+  // The per-origin per-pageload bit limit for `selectURL()` has been
+  // reached. The next call should return the default URL.
+  let worklet = await sharedStorage.createWorklet("/shared-storage/resources/simple-module.js");
+  let config = await worklet.selectURL(
+      "test-url-selection-operation", urls,
+      {data: {'mockResult': 1}, resolveToConfig: true});
+  assert_true(config instanceof FencedFrameConfig);
+  attachFencedFrame(config, 'opaque-ads');
+  const result = await nextValueFromServer(ancestorKey);
+  assert_equals(result, "frame0_loaded", 'when budget should be exhausted;');
+
+}, 'selectURL() called on multiple worklets, with per-origin per-pageload limit');
+</script>
+</body>
diff --git a/tests/wpt/tests/shared-storage/resources/simple-module.js b/tests/wpt/tests/shared-storage/resources/simple-module.js
index 968afed31b9..620a3592f27 100644
--- a/tests/wpt/tests/shared-storage/resources/simple-module.js
+++ b/tests/wpt/tests/shared-storage/resources/simple-module.js
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+var globalVar = 0;
+
 class TestURLSelectionOperation {
   async run(urls, data) {
     if (data && data.hasOwnProperty('mockResult')) {
@@ -12,6 +14,12 @@ class TestURLSelectionOperation {
   }
 }
 
+class IncrementGlobalVariableAndReturnOriginalValueOperation {
+  async run(urls, data) {
+    return globalVar++;
+  }
+}
+
 class VerifyKeyValue {
   async run(urls, data) {
     if (data && data.hasOwnProperty('expectedKey') &&
@@ -39,5 +47,7 @@ class VerifyKeyNotFound {
 }
 
 register('test-url-selection-operation', TestURLSelectionOperation);
+register('increment-global-variable-and-return-original-value-operation',
+         IncrementGlobalVariableAndReturnOriginalValueOperation);
 register('verify-key-value', VerifyKeyValue);
 register('verify-key-not-found', VerifyKeyNotFound);
diff --git a/tests/wpt/tests/shared-storage/run-url-selection-operation-without-add-module.tentative.https.sub.html b/tests/wpt/tests/shared-storage/run-url-selection-operation-without-add-module.tentative.https.sub.html
index 8041a9c5535..bead5807069 100644
--- a/tests/wpt/tests/shared-storage/run-url-selection-operation-without-add-module.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/run-url-selection-operation-without-add-module.tentative.https.sub.html
@@ -13,7 +13,16 @@ for (const resolve_to_config of [true, false]) {
           "test-url-selection-operation",
           [{url: "/shared-storage/resources/frame0.html"}],
           {resolveToConfig: resolve_to_config, keepAlive: true}));
-  }, 'selectURL() without addModule, ' +
+  }, 'sharedStorage.selectURL() without addModule, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    return promise_rejects_dom(t, "OperationError",
+      sharedStorage.worklet.selectURL(
+          "test-url-selection-operation",
+          [{url: "/shared-storage/resources/frame0.html"}],
+          {resolveToConfig: resolve_to_config, keepAlive: true}));
+  }, 'sharedStorage.worklet.selectURL() without addModule, ' +
      'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
 }
 
diff --git a/tests/wpt/tests/shared-storage/select-url-on-shared-storage-and-worklet-object-successively.tentative.https.sub.html b/tests/wpt/tests/shared-storage/select-url-on-shared-storage-and-worklet-object-successively.tentative.https.sub.html
new file mode 100644
index 00000000000..5b920ae6809
--- /dev/null
+++ b/tests/wpt/tests/shared-storage/select-url-on-shared-storage-and-worklet-object-successively.tentative.https.sub.html
@@ -0,0 +1,44 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestor_key = token();
+  let url0 = generateURL("/shared-storage/resources/frame0.html",
+                         [ancestor_key]);
+  let url1 = generateURL("/shared-storage/resources/frame1.html",
+                         [ancestor_key]);
+
+  await addModuleOnce("/shared-storage/resources/simple-module.js");
+
+  let select_url_result0 = await sharedStorage.selectURL(
+      "increment-global-variable-and-return-original-value-operation",
+      [{url: url0}, {url: url1}], {resolveToConfig: true, keepAlive: true});
+  assert_true(validateSelectURLResult(select_url_result0, true));
+  attachFencedFrame(select_url_result0, 'opaque-ads');
+  const result0 = await nextValueFromServer(ancestor_key);
+  assert_equals(result0, "frame0_loaded");
+
+  let select_url_result1 = await sharedStorage.worklet.selectURL(
+      "increment-global-variable-and-return-original-value-operation",
+      [{url: url0}, {url: url1}], {resolveToConfig: true, keepAlive: true});
+  assert_true(validateSelectURLResult(select_url_result1, true));
+  attachFencedFrame(select_url_result1, 'opaque-ads');
+  const result1 = await nextValueFromServer(ancestor_key);
+
+  // This indicates that the prior sharedStorage.selectURL() and
+  // sharedStorage.worklet.selectURL() ran in the same worklet environment.
+  assert_equals(result1, "frame1_loaded");
+
+}, 'selectURL() on window.sharedStorage and window.sharedStorage.worklet ' +
+   'successively. The two calls should run in the same worklet environment.');
+
+</script>
+</body>
diff --git a/tests/wpt/tests/shared-storage/select-url-on-two-worklets.tentative.https.sub.html b/tests/wpt/tests/shared-storage/select-url-on-two-worklets.tentative.https.sub.html
new file mode 100644
index 00000000000..feac45797dc
--- /dev/null
+++ b/tests/wpt/tests/shared-storage/select-url-on-two-worklets.tentative.https.sub.html
@@ -0,0 +1,46 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
+<script src="/fenced-frame/resources/utils.js"></script>
+
+<body>
+<script>
+'use strict';
+
+promise_test(async () => {
+  const ancestor_key = token();
+  let url0 = generateURL("/shared-storage/resources/frame0.html",
+                         [ancestor_key]);
+  let url1 = generateURL("/shared-storage/resources/frame1.html",
+                         [ancestor_key]);
+
+  let worklet0 = await sharedStorage.createWorklet("/shared-storage/resources/simple-module.js");
+  let worklet1 = await sharedStorage.createWorklet("/shared-storage/resources/simple-module.js");
+
+  let select_url_result0 = await worklet0.selectURL(
+      "increment-global-variable-and-return-original-value-operation",
+      [{url: url0}, {url: url1}], {resolveToConfig: true, keepAlive: true});
+  assert_true(validateSelectURLResult(select_url_result0, true));
+  attachFencedFrame(select_url_result0, 'opaque-ads');
+  const result0 = await nextValueFromServer(ancestor_key);
+  assert_equals(result0, "frame0_loaded");
+
+  let select_url_result1 = await worklet1.selectURL(
+      "increment-global-variable-and-return-original-value-operation",
+      [{url: url0}, {url: url1}], {resolveToConfig: true, keepAlive: true});
+  assert_true(validateSelectURLResult(select_url_result1, true));
+  attachFencedFrame(select_url_result1, 'opaque-ads');
+  const result1 = await nextValueFromServer(ancestor_key);
+
+  // This indicates that the prior worklet0.selectURL and worklet1.selectURL ran
+  // in two different worklet environments, as they did not share the global
+  // variable.
+  assert_equals(result1, "frame0_loaded");
+
+}, 'selectURL() on two explicitly created SharedStorageWorklet. The two ' +
+   'calls should run in two different worklet environments.');
+
+</script>
+</body>
diff --git a/tests/wpt/tests/speculation-rules/prefetch/same-origin-cookies.https.html b/tests/wpt/tests/speculation-rules/prefetch/same-origin-cookies.https.html
index d97ee55d106..2f93c1ebb4f 100644
--- a/tests/wpt/tests/speculation-rules/prefetch/same-origin-cookies.https.html
+++ b/tests/wpt/tests/speculation-rules/prefetch/same-origin-cookies.https.html
@@ -5,13 +5,19 @@
 <script src="/resources/testdriver.js"></script>
 <script src='/resources/testdriver-vendor.js'></script>
 <script src="/common/dispatcher/dispatcher.js"></script>
+<script src="/common/subset-tests.js"></script>
 <script src="/common/utils.js"></script>
 <script src="../resources/utils.js"></script>
 <script src="resources/utils.sub.js"></script>
+
+<!--Split test cases due to the use of timeouts in speculation rules test utilities.-->
+<meta name="variant" content="?1-1">
+<meta name="variant" content="?2-last">
+
 <script>
   setup(() => assertSpeculationRulesIsSupported());
 
-  promise_test(async t => {
+  subsetTest(promise_test, async t => {
     await test_driver.delete_all_cookies();
 
     let executor = 'cookies.py';
@@ -36,4 +42,33 @@
 
     assert_prefetched(await agent.getRequestHeaders());
   }, "speculation rules based prefetch should use cookies for same origin urls.");
+
+  // Regression test for https://crbug.com/1524338
+  subsetTest(promise_test, async t => {
+    await test_driver.delete_all_cookies();
+
+    let executor = 'cookies.py';
+    let agent = await spawnWindow(t, { executor });
+    let response_cookies = await agent.getResponseCookies();
+    let request_cookies = await agent.getRequestCookies();
+    assert_equals(request_cookies["count"], undefined);
+    assert_equals(request_cookies["type"], undefined);
+    assert_equals(response_cookies["count"], "1");
+    assert_equals(response_cookies["type"], "navigate");
+
+    await agent.setReferrerPolicy("no-referrer");
+
+    let nextUrl = agent.getExecutorURL({ executor, page: 2 });
+    await agent.forceSinglePrefetch(nextUrl);
+    await agent.navigate(nextUrl);
+
+    response_cookies = await agent.getResponseCookies();
+    request_cookies = await agent.getRequestCookies();
+    assert_equals(request_cookies["count"], "1");
+    assert_equals(request_cookies["type"], "navigate");
+    assert_equals(response_cookies["count"], "2");
+    assert_equals(response_cookies["type"], "prefetch");
+
+    assert_prefetched(await agent.getRequestHeaders());
+  }, "same origin prefetch with no referrer works when cookies are present.");
 </script>
diff --git a/tests/wpt/tests/svg/painting/reftests/marker-implicit-subpaths.html b/tests/wpt/tests/svg/painting/reftests/marker-implicit-subpaths.html
new file mode 100644
index 00000000000..7f87ae05e6f
--- /dev/null
+++ b/tests/wpt/tests/svg/painting/reftests/marker-implicit-subpaths.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<title>Marker on implicit subpath</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/painting.html#RenderingMarkers">
+<link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathDataClosePathCommand">
+<link rel="match" href="../../struct/reftests/reference/green-100x100.html">
+<svg width="400" viewBox="-200 0 400 150">
+  <marker id="m" markerUnits="userSpaceOnUse" orient="auto" overflow="visible">
+    <rect width="100" height="100" fill="green"/>
+  </marker>
+  <rect x="-200" width="100" height="100" fill="red"/>
+  <path d="M-200,0ZZZ" marker-mid="url(#m)" stroke="red" stroke-width="4"/>
+</svg>
diff --git a/tests/wpt/tests/svg/pservers/reftests/gradient-transform-01.svg b/tests/wpt/tests/svg/pservers/reftests/gradient-transform-01.svg
new file mode 100644
index 00000000000..310cb7de513
--- /dev/null
+++ b/tests/wpt/tests/svg/pservers/reftests/gradient-transform-01.svg
@@ -0,0 +1,18 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>Gradients with non-invertible gradientTransforms, linearGradient</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#pservers-LinearGradientElementGradientTransformAttribute"/>
+  <h:link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-function-lists"/>
+  <h:link rel="match" href="reference/green-100x100.svg"/>
+
+  <linearGradient id="scale0" gradientTransform="scale(0)">
+    <stop offset="0" stop-color="yellow"/>
+    <stop offset="1" stop-color="red"/>
+  </linearGradient>
+  <rect width="50" height="100" fill="url(#scale0) green"/>
+
+  <linearGradient id="matrix0" gradientTransform="matrix(0, 0, 0, 0, 0, 0)">
+    <stop offset="0" stop-color="yellow"/>
+    <stop offset="1" stop-color="red"/>
+  </linearGradient>
+  <rect x="50" width="50" height="100" fill="url(#matrix0) green"/>
+</svg>
diff --git a/tests/wpt/tests/svg/pservers/reftests/gradient-transform-02.svg b/tests/wpt/tests/svg/pservers/reftests/gradient-transform-02.svg
new file mode 100644
index 00000000000..1ce1006b839
--- /dev/null
+++ b/tests/wpt/tests/svg/pservers/reftests/gradient-transform-02.svg
@@ -0,0 +1,18 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>Gradients with non-invertible gradientTransforms, radialGradient</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#pservers-RadialGradientElementGradientTransformAttribute"/>
+  <h:link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-function-lists"/>
+  <h:link rel="match" href="reference/green-100x100.svg"/>
+
+  <radialGradient id="scale0" gradientTransform="scale(0)">
+    <stop offset="0" stop-color="yellow"/>
+    <stop offset="1" stop-color="red"/>
+  </radialGradient>
+  <rect width="50" height="100" fill="url(#scale0) green"/>
+
+  <radialGradient id="matrix0" gradientTransform="matrix(0, 0, 0, 0, 0, 0)">
+    <stop offset="0" stop-color="yellow"/>
+    <stop offset="1" stop-color="red"/>
+  </radialGradient>
+  <rect x="50" width="50" height="100" fill="url(#matrix0) green"/>
+</svg>
diff --git a/tests/wpt/tests/svg/pservers/reftests/pattern-transform-02.svg b/tests/wpt/tests/svg/pservers/reftests/pattern-transform-02.svg
new file mode 100644
index 00000000000..93acd1d6273
--- /dev/null
+++ b/tests/wpt/tests/svg/pservers/reftests/pattern-transform-02.svg
@@ -0,0 +1,18 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>Patterns with non-invertible patternTransforms</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#pservers-PatternElementPatternTransformAttribute"/>
+  <h:link rel="help" href="https://drafts.csswg.org/css-transforms/#transform-function-lists"/>
+  <h:link rel="match" href="reference/green-100x100.svg"/>
+
+  <pattern id="scale0" width="50" height="100"
+           patternTransform="scale(0)">
+    <rect width="50" height="100" fill="red"/>
+  </pattern>
+  <rect width="50" height="100" fill="url(#scale0) green"/>
+
+  <pattern id="matrix0" width="50" height="100"
+           patternTransform="matrix(0, 0, 0, 0, 0, 0)">
+    <rect width="50" height="100" fill="red"/>
+  </pattern>
+  <rect x="50" width="50" height="100" fill="url(#matrix0) green"/>
+</svg>
diff --git a/tests/wpt/tests/svg/text/crashtests/textlength-zwj-crash.svg b/tests/wpt/tests/svg/text/crashtests/textlength-zwj-crash.svg
new file mode 100644
index 00000000000..547e919b7d0
--- /dev/null
+++ b/tests/wpt/tests/svg/text/crashtests/textlength-zwj-crash.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg"><text textLength="50" lengthAdjust="spacingAndGlyphs">&#x200D;</text></svg>
diff --git a/tests/wpt/tests/svg/text/reftests/first-letter-ref.svg b/tests/wpt/tests/svg/text/reftests/first-letter-ref.svg
new file mode 100644
index 00000000000..66f5c6d6828
--- /dev/null
+++ b/tests/wpt/tests/svg/text/reftests/first-letter-ref.svg
@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <style>
+    text {
+      font-family: Ahem;
+      font-size: 50px;
+    }
+  </style>
+  <text x="100" y="100">
+    <tspan fill="green">X</tspan>XXX
+  </text>
+</svg>
diff --git a/tests/wpt/tests/svg/text/reftests/first-letter.svg b/tests/wpt/tests/svg/text/reftests/first-letter.svg
new file mode 100644
index 00000000000..d3b62a5a589
--- /dev/null
+++ b/tests/wpt/tests/svg/text/reftests/first-letter.svg
@@ -0,0 +1,20 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:title>first-letter should apply to SVG text</h:title>
+    <h:link rel="help" href="https://www.w3.org/TR/SVG2/text.html#TextProperties"/>
+    <h:link rel="match" href="first-letter-ref.svg"/>
+    <h:link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+  </metadata>
+  <style>
+    text {
+      font-family: Ahem;
+      font-size: 50px;
+    }
+    text::first-letter {
+      fill: green;
+    }
+  </style>
+  <text x="100" y="100">
+    <tspan>XXXX</tspan>
+  </text>
+</svg>
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
index f0a2a5b8026..30daa4c48ba 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
@@ -21,6 +21,52 @@ class NetworkStringValue(Dict[str, Any]):
 NetworkBytesValue = Union[NetworkStringValue, NetworkBase64Value]
 
 
+class CookieHeader(Dict[str, Any]):
+    def __init__(self, name: str, value: NetworkBytesValue):
+        dict.__init__(self, name=name, value=value)
+
+
+class Header(Dict[str, Any]):
+    def __init__(self, name: str, value: NetworkBytesValue):
+        dict.__init__(self, name=name, value=value)
+
+
+class SetCookieHeader(Dict[str, Any]):
+    def __init__(
+        self,
+        name: str,
+        value: NetworkBytesValue,
+        domain: Optional[str] = None,
+        expiry: Optional[str] = None,
+        http_only: Optional[bool] = None,
+        max_age: Optional[int] = None,
+        path: Optional[str] = None,
+        same_site: Optional[str] = None,
+        secure: Optional[bool] = None,
+    ):
+        dict.__init__(self, name=name, value=value)
+
+        if domain is not None:
+            self["domain"] = domain
+
+        if expiry is not None:
+            self["expiry"] = expiry
+
+        if http_only is not None:
+            self["httpOnly"] = http_only
+
+        if max_age is not None:
+            self["maxAge"] = max_age
+
+        if path is not None:
+            self["path"] = path
+
+        if same_site is not None:
+            self["sameSite"] = same_site
+
+        if secure is not None:
+            self["secure"] = secure
+
 
 class URLPatternPattern(Dict[str, Any]):
     def __init__(
@@ -96,39 +142,60 @@ class Network(BidiModule):
     @command
     def continue_request(self,
                          request: str,
+                         body: Optional[NetworkBytesValue] = None,
+                         cookies: Optional[List[CookieHeader]] = None,
+                         headers: Optional[List[Header]] = None,
                          method: Optional[str] = None,
                          url: Optional[str] = None) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {
             "request": request,
         }
 
+        if body is not None:
+            params["body"] = body
+
+        if cookies is not None:
+            params["cookies"] = cookies
+
+        if headers is not None:
+            params["headers"] = headers
+
         if method is not None:
             params["method"] = method
 
         if url is not None:
             params["url"] = url
 
-        # TODO: Add support for missing parameters: body, cookies, headers
-
         return params
 
     @command
     def continue_response(
             self,
             request: str,
+            cookies: Optional[List[SetCookieHeader]] = None,
+            credentials: Optional[AuthCredentials] = None,
+            headers: Optional[List[Header]] = None,
             reason_phrase: Optional[str] = None,
             status_code: Optional[int] = None) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {
             "request": request,
         }
 
+        if cookies is not None:
+            params["cookies"] = cookies
+
+        if credentials is not None:
+            params["credentials"] = credentials
+
+        if headers is not None:
+            params["headers"] = headers
+
         if reason_phrase is not None:
             params["reasonPhrase"] = reason_phrase
 
         if status_code is not None:
             params["statusCode"] = status_code
 
-        # TODO: Add support for missing parameters: body, credentials, headers
 
         return params
 
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
index 06f3d34f3f0..05f81461e2a 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
@@ -147,7 +147,8 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data,
     # 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"]:
+    if kwargs["headless"] and ("--headless=new" not in chrome_options["args"] and
+                               "--headless" not in chrome_options["args"]):
         chrome_options["args"].append("--headless=new")
 
     if test_type == "wdspec":
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
index 46d45e6a045..6bcbef7c477 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -106,6 +106,7 @@ def check_args(**kwargs):
 
 def browser_kwargs(logger, test_type, run_info_data, config, subsuite, **kwargs):
     browser_kwargs = {"binary": kwargs["binary"],
+                      "package_name": None,
                       "webdriver_binary": kwargs["webdriver_binary"],
                       "webdriver_args": kwargs["webdriver_args"].copy(),
                       "prefs_root": kwargs["prefs_root"],
@@ -642,8 +643,8 @@ class GeckodriverOutputHandler(FirefoxOutputHandler):
 
 class ProfileCreator:
     def __init__(self, logger, prefs_root, config, test_type, extra_prefs,
-                 disable_fission, debug_test, browser_channel, binary, certutil_binary,
-                 ca_certificate_path):
+                 disable_fission, debug_test, browser_channel, binary,
+                 package_name, certutil_binary, ca_certificate_path):
         self.logger = logger
         self.prefs_root = prefs_root
         self.config = config
@@ -654,6 +655,7 @@ class ProfileCreator:
         self.browser_channel = browser_channel
         self.ca_certificate_path = ca_certificate_path
         self.binary = binary
+        self.package_name = package_name
         self.certutil_binary = certutil_binary
         self.ca_certificate_path = ca_certificate_path
 
@@ -786,7 +788,8 @@ class ProfileCreator:
 class FirefoxBrowser(Browser):
     init_timeout = 70
 
-    def __init__(self, logger, binary, prefs_root, test_type, extra_prefs=None, debug_info=None,
+    def __init__(self, logger, binary, package_name, prefs_root, test_type,
+                 extra_prefs=None, debug_info=None,
                  symbols_path=None, stackwalk_binary=None, certutil_binary=None,
                  ca_certificate_path=None, e10s=False, disable_fission=False,
                  stackfix_dir=None, binary_args=None, timeout_multiplier=None, leak_check=False,
@@ -821,6 +824,7 @@ class FirefoxBrowser(Browser):
                                          debug_test,
                                          browser_channel,
                                          binary,
+                                         package_name,
                                          certutil_binary,
                                          ca_certificate_path)
 
@@ -888,15 +892,17 @@ class FirefoxBrowser(Browser):
 
 
 class FirefoxWdSpecBrowser(WebDriverBrowser):
-    def __init__(self, logger, binary, prefs_root, webdriver_binary, webdriver_args,
+    def __init__(self, logger, binary, package_name, prefs_root, webdriver_binary, webdriver_args,
                  extra_prefs=None, debug_info=None, symbols_path=None, stackwalk_binary=None,
                  certutil_binary=None, ca_certificate_path=None, e10s=False,
                  disable_fission=False, stackfix_dir=None, leak_check=False,
-                 asan=False, chaos_mode_flags=None, config=None,
-                 browser_channel="nightly", headless=None, debug_test=False, **kwargs):
+                 asan=False, chaos_mode_flags=None, config=None, browser_channel="nightly",
+                 headless=None, debug_test=False, profile_creator_cls=ProfileCreator,
+                 **kwargs):
 
         super().__init__(logger, binary, webdriver_binary, webdriver_args)
         self.binary = binary
+        self.package_name = package_name
         self.webdriver_binary = webdriver_binary
 
         self.stackfix_dir = stackfix_dir
@@ -909,17 +915,18 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
 
         self.env = self.get_env(binary, debug_info, headless, chaos_mode_flags, e10s)
 
-        profile_creator = ProfileCreator(logger,
-                                         prefs_root,
-                                         config,
-                                         "wdspec",
-                                         extra_prefs,
-                                         disable_fission,
-                                         debug_test,
-                                         browser_channel,
-                                         binary,
-                                         certutil_binary,
-                                         ca_certificate_path)
+        profile_creator = profile_creator_cls(logger,
+                                              prefs_root,
+                                              config,
+                                              "wdspec",
+                                              extra_prefs,
+                                              disable_fission,
+                                              debug_test,
+                                              browser_channel,
+                                              binary,
+                                              package_name,
+                                              certutil_binary,
+                                              ca_certificate_path)
 
         self.profile = profile_creator.create()
         self.marionette_port = None
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
index 18c3c6b11ec..aa9cf633232 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox_android.py
@@ -49,6 +49,7 @@ def browser_kwargs(logger, test_type, run_info_data, config, **kwargs):
     return {"adb_binary": kwargs["adb_binary"],
             "webdriver_binary": kwargs["webdriver_binary"],
             "webdriver_args": kwargs["webdriver_args"].copy(),
+            "binary": None,
             "package_name": kwargs["package_name"],
             "device_serial": kwargs["device_serial"],
             "prefs_root": kwargs["prefs_root"],
@@ -145,10 +146,12 @@ def get_environ(chaos_mode_flags, env_extras=None):
 
 class ProfileCreator(FirefoxProfileCreator):
     def __init__(self, logger, prefs_root, config, test_type, extra_prefs,
-                 disable_fission, debug_test, browser_channel, certutil_binary, ca_certificate_path):
+                 disable_fission, debug_test, browser_channel, binary,
+                 package_name, certutil_binary, ca_certificate_path):
+
         super().__init__(logger, prefs_root, config, test_type, extra_prefs,
                          disable_fission, debug_test, browser_channel, None,
-                         certutil_binary, ca_certificate_path)
+                         package_name, certutil_binary, ca_certificate_path)
 
     def _set_required_prefs(self, profile):
         profile.set_preferences({
@@ -225,6 +228,8 @@ class FirefoxAndroidBrowser(Browser):
                                               disable_fission,
                                               debug_test,
                                               browser_channel,
+                                              None,
+                                              package_name,
                                               certutil_binary,
                                               ca_certificate_path)
 
@@ -349,21 +354,21 @@ class FirefoxAndroidWdSpecBrowser(FirefoxWdSpecBrowser):
                  certutil_binary=None, ca_certificate_path=None,
                  disable_fission=False, stackfix_dir=None, leak_check=False,
                  asan=False, chaos_mode_flags=None, config=None,
-                 browser_channel="nightly", headless=None,
-                 package_name="org.mozilla.geckoview.test_runner", device_serial=None,
-                 adb_binary=None, **kwargs):
+                 browser_channel="nightly", headless=None, debug_test=None,
+                 binary=None, package_name="org.mozilla.geckoview.test_runner", device_serial=None,
+                 adb_binary=None, profile_creator_cls=ProfileCreator, **kwargs):
 
-        super().__init__(logger, None, prefs_root, webdriver_binary, webdriver_args,
+        super().__init__(logger, None, package_name, prefs_root, webdriver_binary, webdriver_args,
                          extra_prefs=extra_prefs, debug_info=debug_info, symbols_path=symbols_path,
                          stackwalk_binary=stackwalk_binary, certutil_binary=certutil_binary,
                          ca_certificate_path=ca_certificate_path,
                          disable_fission=disable_fission, stackfix_dir=stackfix_dir,
                          leak_check=leak_check, asan=asan,
                          chaos_mode_flags=chaos_mode_flags, config=config,
-                         browser_channel=browser_channel, headless=headless, **kwargs)
+                         browser_channel=browser_channel, headless=headless,
+                         debug_test=debug_test, profile_creator_cls=profile_creator_cls, **kwargs)
 
         self.config = config
-        self.package_name = package_name
         self.device_serial = device_serial
         # This is just to support the same adb lookup as for other test types
         context = get_app_context("fennec")(adb_path=adb_binary, device_serial=device_serial)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
index 7119c0b019d..763b6fcb19f 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
@@ -90,9 +90,9 @@ class TestharnessResultConverter:
         """Convert a JSON result into a (TestResult, [SubtestResult]) tuple"""
         result_url, status, message, stack, subtest_results = result
         assert result_url == test.url, (f"Got results from {result_url}, expected {test.url}")
-        harness_result = test.result_cls(self.harness_codes[status], message, extra=extra, stack=stack)
+        harness_result = test.make_result(self.harness_codes[status], message, extra=extra, stack=stack)
         return (harness_result,
-                [test.subtest_result_cls(st_name, self.test_codes[st_status], st_message, st_stack)
+                [test.make_subtest_result(st_name, self.test_codes[st_status], st_message, st_stack)
                  for st_name, st_status, st_message, st_stack in subtest_results])
 
 
@@ -152,7 +152,7 @@ def get_pages(ranges_value, total_pages):
 def reftest_result_converter(self, test, result):
     extra = result.get("extra", {})
     _ensure_hash_in_reftest_screenshots(extra)
-    return (test.result_cls(
+    return (test.make_result(
         result["status"],
         result["message"],
         extra=extra,
@@ -165,14 +165,14 @@ def pytest_result_converter(self, test, data):
     if subtest_data is None:
         subtest_data = []
 
-    harness_result = test.result_cls(*harness_data)
-    subtest_results = [test.subtest_result_cls(*item) for item in subtest_data]
+    harness_result = test.make_result(*harness_data)
+    subtest_results = [test.make_subtest_result(*item) for item in subtest_data]
 
     return (harness_result, subtest_results)
 
 
 def crashtest_result_converter(self, test, result):
-    return test.result_cls(**result), []
+    return test.make_result(**result), []
 
 
 class ExecutorException(Exception):
@@ -352,7 +352,7 @@ class TestExecutor:
         if message:
             message += "\n"
         message += exception_string
-        return test.result_cls(status, message), []
+        return test.make_result(status, message), []
 
     def wait(self):
         return self.protocol.base.wait()
@@ -648,7 +648,7 @@ class WdspecExecutor(TestExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_wdspec(self, path, timeout):
         session_config = {"host": self.browser.host,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
index 7a54eb097f9..f5641471562 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorchrome.py
@@ -46,7 +46,7 @@ def make_sanitizer_mixin(crashtest_executor_cls: Type[CrashtestExecutor]):  # ty
                         status = result["status"]
                         if status == "PASS":
                             status = "OK"
-                        harness_result = test.result_cls(status, result["message"])
+                        harness_result = test.make_result(status, result["message"])
                         # Don't report subtests.
                         return harness_result, []
                     # `crashtest` statuses are a subset of `(print-)reftest`
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorcontentshell.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorcontentshell.py
index 5c4068c7acf..82a6aebcdb1 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorcontentshell.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorcontentshell.py
@@ -213,14 +213,14 @@ def _convert_exception(test, exception, errors):
     """Converts our TimeoutError and CrashError exceptions into test results.
     """
     if isinstance(exception, TimeoutError):
-        return (test.result_cls("EXTERNAL-TIMEOUT", errors), [])
+        return (test.make_result("EXTERNAL-TIMEOUT", errors), [])
     if isinstance(exception, CrashError):
-        return (test.result_cls("CRASH", errors), [])
+        return (test.make_result("CRASH", errors), [])
     if isinstance(exception, LeakError):
         # TODO: the internal error is to force a restart, but it doesn't correctly
         # describe what the issue is. Need to find a way to return a "FAIL",
         # and restart the content_shell after the test run.
-        return (test.result_cls("INTERNAL-ERROR", errors), [])
+        return (test.make_result("INTERNAL-ERROR", errors), [])
     raise exception
 
 
@@ -312,7 +312,7 @@ class ContentShellTestharnessExecutor(TestharnessExecutor, _SanitizerMixin):  #
                                                                timeout_for_test(self, test))
             errors = self.protocol.content_shell_errors.read_errors()
             if not text:
-                return (test.result_cls("ERROR", errors), [])
+                return (test.make_result("ERROR", errors), [])
 
             result_url, status, message, stack, subtest_results = json.loads(text)
             if result_url != test.url:
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index 21be5e852bf..a5bf61d4053 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -979,7 +979,7 @@ class MarionetteTestharnessExecutor(TestharnessExecutor):
         if success:
             return self.convert_result(test, data, extra=extra)
 
-        return (test.result_cls(extra=extra, *data), [])
+        return (test.make_result(extra=extra, *data), [])
 
     def do_testharness(self, protocol, url, timeout):
         parent_window = protocol.testharness.close_old_windows(self.last_environment["protocol"])
@@ -1277,7 +1277,7 @@ class MarionetteCrashtestExecutor(CrashtestExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(extra=extra, *data), [])
+        return (test.make_result(extra=extra, *data), [])
 
     def do_crashtest(self, protocol, url, timeout):
         if self.protocol.coverage.is_enabled:
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorselenium.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorselenium.py
index 128e6480464..cf5ac2a22f0 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorselenium.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorselenium.py
@@ -369,7 +369,7 @@ class SeleniumTestharnessExecutor(TestharnessExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_testharness(self, protocol, url, timeout):
         format_map = {"url": strip_server(url)}
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservo.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservo.py
index dd1ea1a3b36..9c938b6e75e 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservo.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservo.py
@@ -136,10 +136,10 @@ class ServoTestharnessExecutor(ServoExecutor):
                     result = self.convert_result(test, self.result_data)
                 else:
                     self.proc.wait()
-                    result = (test.result_cls("CRASH", None), [])
+                    result = (test.make_result("CRASH", None), [])
                     proc_is_running = False
             else:
-                result = (test.result_cls("TIMEOUT", None), [])
+                result = (test.make_result("TIMEOUT", None), [])
 
             if proc_is_running:
                 if self.pause_after_test:
@@ -312,7 +312,7 @@ class ServoCrashtestExecutor(ServoExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_crashtest(self, protocol, url, timeout):
         self.command = self.build_servo_command(self.test, extra_args=["-x"])
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservodriver.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
index 0a939c5251e..5d7d55f30b5 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorservodriver.py
@@ -201,7 +201,7 @@ class ServoWebDriverTestharnessExecutor(TestharnessExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_testharness(self, session, url, timeout):
         session.url = url
@@ -257,15 +257,15 @@ class ServoWebDriverRefTestExecutor(RefTestExecutor):
             result = self.implementation.run_test(test)
             return self.convert_result(test, result)
         except OSError:
-            return test.result_cls("CRASH", None), []
+            return test.make_result("CRASH", None), []
         except TimeoutError:
-            return test.result_cls("TIMEOUT", None), []
+            return test.make_result("TIMEOUT", None), []
         except Exception as e:
             message = getattr(e, "message", "")
             if message:
                 message += "\n"
             message += traceback.format_exc()
-            return test.result_cls("INTERNAL-ERROR", message), []
+            return test.make_result("INTERNAL-ERROR", message), []
 
     def screenshot(self, test, viewport_size, dpi, page_ranges):
         # https://github.com/web-platform-tests/wpt/issues/7135
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index 05a26bc162f..b49b9e2b574 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -586,7 +586,7 @@ class WebDriverTestharnessExecutor(TestharnessExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_testharness(self, protocol, url, timeout):
         # The previous test may not have closed its old windows (if something
@@ -752,7 +752,7 @@ class WebDriverCrashtestExecutor(CrashtestExecutor):
         if success:
             return self.convert_result(test, data)
 
-        return (test.result_cls(*data), [])
+        return (test.make_result(*data), [])
 
     def do_crashtest(self, protocol, url, timeout):
         protocol.base.load(url)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwktr.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwktr.py
index b240bca556a..3c02fa799e0 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwktr.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwktr.py
@@ -172,9 +172,9 @@ def _convert_exception(test, exception, errors):
     """Converts our TimeoutError and CrashError exceptions into test results.
     """
     if isinstance(exception, TimeoutError):
-        return (test.result_cls("EXTERNAL-TIMEOUT", errors), [])
+        return (test.make_result("EXTERNAL-TIMEOUT", errors), [])
     if isinstance(exception, CrashError):
-        return (test.result_cls("CRASH", errors), [])
+        return (test.make_result("CRASH", errors), [])
     raise exception
 
 
@@ -245,7 +245,7 @@ class WKTRTestharnessExecutor(TestharnessExecutor):
 
             errors = self.protocol.wktr_errors.read_errors()
             if not text:
-                return (test.result_cls("ERROR", errors), [])
+                return (test.make_result("ERROR", errors), [])
 
             output = None
             output_prefix = "CONSOLE MESSAGE: WPTRUNNER OUTPUT:"
@@ -255,10 +255,10 @@ class WKTRTestharnessExecutor(TestharnessExecutor):
                     if output is None:
                         output = line[len(output_prefix):]
                     else:
-                        return (test.result_cls("ERROR", "multiple wptrunner outputs"), [])
+                        return (test.make_result("ERROR", "multiple wptrunner outputs"), [])
 
             if output is None:
-                return (test.result_cls("ERROR", "no wptrunner output"), [])
+                return (test.make_result("ERROR", "no wptrunner output"), [])
 
             return self.convert_result(test, json.loads(output))
         except BaseException as exception:
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py b/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
index 63f856d1c64..28d06f88ee1 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
@@ -663,9 +663,9 @@ class TestRunnerManager(threading.Thread):
         self.inject_message(
             "test_ended",
             test,
-            (test.result_cls("EXTERNAL-TIMEOUT",
-                             "TestRunner hit external timeout "
-                             "(this may indicate a hang)"), []),
+            (test.make_result("EXTERNAL-TIMEOUT",
+                              "TestRunner hit external timeout "
+                              "(this may indicate a hang)"), []),
         )
 
     def test_ended(self, test, results):
@@ -691,8 +691,8 @@ class TestRunnerManager(threading.Thread):
         for result in test_results:
             if test.disabled(result.name):
                 continue
-            expected = test.expected(result.name)
-            known_intermittent = test.known_intermittent(result.name)
+            expected = result.expected
+            known_intermittent = result.known_intermittent
             is_unexpected = expected != result.status and result.status not in known_intermittent
             is_expected_notrun = (expected == "NOTRUN" or "NOTRUN" in known_intermittent)
 
@@ -728,8 +728,8 @@ class TestRunnerManager(threading.Thread):
                                     stack=result.stack,
                                     subsuite=self.state.subsuite)
 
-        expected = test.expected()
-        known_intermittent = test.known_intermittent()
+        expected = file_result.expected
+        known_intermittent = file_result.known_intermittent
         status = file_result.status
 
         if self.browser.check_crash(test.id) and status != "CRASH":
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
index 6df1c4cf2cd..2e3fd974d4d 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
@@ -4,7 +4,7 @@ import subprocess
 import sys
 from abc import ABC
 from collections import defaultdict
-from typing import Any, ClassVar, Dict, Optional, Type
+from typing import Any, ClassVar, Dict, Optional, Set, Type
 from urllib.parse import urljoin
 
 from .wptmanifest.parser import atoms
@@ -14,6 +14,9 @@ enabled_tests = {"testharness", "reftest", "wdspec", "crashtest", "print-reftest
 
 
 class Result(ABC):
+    default_expected: ClassVar[str]
+    statuses: Set[str]
+
     def __init__(self,
                  status,
                  message,
@@ -25,7 +28,7 @@ class Result(ABC):
             raise ValueError("Unrecognised status %s" % status)
         self.status = status
         self.message = message
-        self.expected = expected
+        self.expected = expected if expected is not None else self.default_expected
         self.known_intermittent = known_intermittent if known_intermittent is not None else []
         self.extra = extra if extra is not None else {}
         self.stack = stack
@@ -238,6 +241,25 @@ class Test(ABC):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def make_result(self,
+                    status,
+                    message,
+                    expected=None,
+                    extra=None,
+                    stack=None,
+                    known_intermittent=None):
+        if expected is None:
+            expected = self.expected()
+            known_intermittent = self.known_intermittent()
+        return self.result_cls(status, message, expected, extra, stack, known_intermittent)
+
+    def make_subtest_result(self, name, status, message, stack=None, expected=None,
+                            known_intermittent=None):
+        if expected is None:
+            expected = self.expected(name)
+            known_intermittent = self.known_intermittent(name)
+        return self.subtest_result_cls(name, status, message, stack, expected, known_intermittent)
+
     def update_metadata(self, metadata=None):
         if metadata is None:
             metadata = {}
diff --git a/tests/wpt/tests/tools/wptserve/wptserve/server.py b/tests/wpt/tests/tools/wptserve/wptserve/server.py
index 815892d0b1b..e1772d00b15 100644
--- a/tests/wpt/tests/tools/wptserve/wptserve/server.py
+++ b/tests/wpt/tests/tools/wptserve/wptserve/server.py
@@ -217,10 +217,10 @@ class WebTestServer(http.server.ThreadingHTTPServer):
                                                       server_side=True)
 
             else:
-                self.socket = ssl.wrap_socket(self.socket,
-                                              keyfile=self.key_file,
-                                              certfile=self.certificate,
-                                              server_side=True)
+                ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+                ssl_context.load_cert_chain(keyfile=self.key_file, certfile=self.certificate)
+                self.socket = ssl_context.wrap_socket(self.socket,
+                                                      server_side=True)
 
     def handle_error(self, request, client_address):
         error = sys.exc_info()[1]
@@ -322,10 +322,10 @@ class BaseWebTestRequestHandler(http.server.BaseHTTPRequestHandler):
         response.write()
         if self.server.encrypt_after_connect:
             self.logger.debug("Enabling SSL for connection")
-            self.request = ssl.wrap_socket(self.connection,
-                                           keyfile=self.server.key_file,
-                                           certfile=self.server.certificate,
-                                           server_side=True)
+            ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+            ssl_context.load_cert_chain(keyfile=self.server.key_file, certfile=self.server.certificate)
+            self.request = ssl_context.wrap_socket(self.connection,
+                                                   server_side=True)
             self.setup()
         return
 
diff --git a/tests/wpt/tests/uievents/historical.html b/tests/wpt/tests/uievents/historical.html
index d2d33b44c70..5aa76f41ac5 100644
--- a/tests/wpt/tests/uievents/historical.html
+++ b/tests/wpt/tests/uievents/historical.html
@@ -8,4 +8,8 @@ test(function() {
   assert_false("initWheelEvent" in WheelEvent.prototype,
                "Should not be supported on the prototype");
 }, "WheelEvent#initWheelEvent");
+test(function() {
+  assert_false("initWebKitWheelEvent" in WheelEvent.prototype,
+               "Should not be supported on the prototype");
+}, "WheelEvent#initWebKitWheelEvent");
 </script>
diff --git a/tests/wpt/tests/wai-aria/role/generic-roles.html b/tests/wpt/tests/wai-aria/role/generic-roles.html
new file mode 100644
index 00000000000..9a67312dd8c
--- /dev/null
+++ b/tests/wpt/tests/wai-aria/role/generic-roles.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+<head>
+  <title>Generic Role Verification Tests</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/testdriver-actions.js"></script>
+  <script src="/wai-aria/scripts/aria-utils.js"></script>
+</head>
+<body>
+
+<p>Tests <a href="https://w3c.github.io/aria/#generic">generic</a>.</p>
+
+<p role="generic" data-testname="generic role on p element is generic" class="ex-generic">x</p>
+
+<script>
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
+</script>
+
+</body>
+</html>
diff --git a/tests/wpt/tests/web-animations/animation-model/animation-types/property-list.js b/tests/wpt/tests/web-animations/animation-model/animation-types/property-list.js
index 692ff013287..98ab02a1221 100644
--- a/tests/wpt/tests/web-animations/animation-model/animation-types/property-list.js
+++ b/tests/wpt/tests/web-animations/animation-model/animation-types/property-list.js
@@ -440,6 +440,12 @@ const gCSSProperties1 = {
       { type: 'discrete', options: [ [ 'show', 'hide' ] ] }
     ]
   },
+  'field-sizing': {
+    // https://drafts.csswg.org/css-ui/#field-sizing
+    types: [
+      { type: 'discrete', options: [ [ 'fixed', 'content' ] ] }
+    ]
+  },
   'fill': {
     // https://svgwg.org/svg2-draft/painting.html#FillProperty
     types: [
diff --git a/tests/wpt/tests/web-locks/acquire.tentative.https.any.js b/tests/wpt/tests/web-locks/acquire.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/acquire.tentative.https.any.js
rename to tests/wpt/tests/web-locks/acquire.https.any.js
diff --git a/tests/wpt/tests/web-locks/clientids.tentative.https.html b/tests/wpt/tests/web-locks/clientids.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/clientids.tentative.https.html
rename to tests/wpt/tests/web-locks/clientids.https.html
diff --git a/tests/wpt/tests/web-locks/frames.tentative.https.html b/tests/wpt/tests/web-locks/frames.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/frames.tentative.https.html
rename to tests/wpt/tests/web-locks/frames.https.html
diff --git a/tests/wpt/tests/web-locks/held.tentative.https.any.js b/tests/wpt/tests/web-locks/held.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/held.tentative.https.any.js
rename to tests/wpt/tests/web-locks/held.https.any.js
diff --git a/tests/wpt/tests/web-locks/idlharness.tentative.https.any.js b/tests/wpt/tests/web-locks/idlharness.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/idlharness.tentative.https.any.js
rename to tests/wpt/tests/web-locks/idlharness.https.any.js
diff --git a/tests/wpt/tests/web-locks/ifAvailable.tentative.https.any.js b/tests/wpt/tests/web-locks/ifAvailable.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/ifAvailable.tentative.https.any.js
rename to tests/wpt/tests/web-locks/ifAvailable.https.any.js
diff --git a/tests/wpt/tests/web-locks/lock-attributes.tentative.https.any.js b/tests/wpt/tests/web-locks/lock-attributes.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/lock-attributes.tentative.https.any.js
rename to tests/wpt/tests/web-locks/lock-attributes.https.any.js
diff --git a/tests/wpt/tests/web-locks/mode-exclusive.tentative.https.any.js b/tests/wpt/tests/web-locks/mode-exclusive.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/mode-exclusive.tentative.https.any.js
rename to tests/wpt/tests/web-locks/mode-exclusive.https.any.js
diff --git a/tests/wpt/tests/web-locks/mode-mixed.tentative.https.any.js b/tests/wpt/tests/web-locks/mode-mixed.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/mode-mixed.tentative.https.any.js
rename to tests/wpt/tests/web-locks/mode-mixed.https.any.js
diff --git a/tests/wpt/tests/web-locks/mode-shared.tentative.https.any.js b/tests/wpt/tests/web-locks/mode-shared.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/mode-shared.tentative.https.any.js
rename to tests/wpt/tests/web-locks/mode-shared.https.any.js
diff --git a/tests/wpt/tests/web-locks/non-fully-active.tentative.https.html b/tests/wpt/tests/web-locks/non-fully-active.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/non-fully-active.tentative.https.html
rename to tests/wpt/tests/web-locks/non-fully-active.https.html
diff --git a/tests/wpt/tests/web-locks/non-secure-context.tentative.any.js b/tests/wpt/tests/web-locks/non-secure-context.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/non-secure-context.tentative.any.js
rename to tests/wpt/tests/web-locks/non-secure-context.any.js
diff --git a/tests/wpt/tests/web-locks/opaque-origin.tentative.https.html b/tests/wpt/tests/web-locks/opaque-origin.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/opaque-origin.tentative.https.html
rename to tests/wpt/tests/web-locks/opaque-origin.https.html
diff --git a/tests/wpt/tests/web-locks/query-empty.tentative.https.any.js b/tests/wpt/tests/web-locks/query-empty.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/query-empty.tentative.https.any.js
rename to tests/wpt/tests/web-locks/query-empty.https.any.js
diff --git a/tests/wpt/tests/web-locks/query-ordering.tentative.https.html b/tests/wpt/tests/web-locks/query-ordering.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/query-ordering.tentative.https.html
rename to tests/wpt/tests/web-locks/query-ordering.https.html
diff --git a/tests/wpt/tests/web-locks/query.tentative.https.any.js b/tests/wpt/tests/web-locks/query.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/query.tentative.https.any.js
rename to tests/wpt/tests/web-locks/query.https.any.js
diff --git a/tests/wpt/tests/web-locks/resource-names.tentative.https.any.js b/tests/wpt/tests/web-locks/resource-names.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/resource-names.tentative.https.any.js
rename to tests/wpt/tests/web-locks/resource-names.https.any.js
diff --git a/tests/wpt/tests/web-locks/secure-context.tentative.https.any.js b/tests/wpt/tests/web-locks/secure-context.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/secure-context.tentative.https.any.js
rename to tests/wpt/tests/web-locks/secure-context.https.any.js
diff --git a/tests/wpt/tests/web-locks/signal.tentative.https.any.js b/tests/wpt/tests/web-locks/signal.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/signal.tentative.https.any.js
rename to tests/wpt/tests/web-locks/signal.https.any.js
diff --git a/tests/wpt/tests/web-locks/steal.tentative.https.any.js b/tests/wpt/tests/web-locks/steal.https.any.js
similarity index 100%
rename from tests/wpt/tests/web-locks/steal.tentative.https.any.js
rename to tests/wpt/tests/web-locks/steal.https.any.js
diff --git a/tests/wpt/tests/web-locks/workers.tentative.https.html b/tests/wpt/tests/web-locks/workers.https.html
similarity index 100%
rename from tests/wpt/tests/web-locks/workers.tentative.https.html
rename to tests/wpt/tests/web-locks/workers.https.html
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/osc-basic-waveform.html b/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/osc-basic-waveform.html
index b34c96855fd..abd1ff8d0e5 100644
--- a/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/osc-basic-waveform.html
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-oscillatornode-interface/osc-basic-waveform.html
@@ -50,8 +50,8 @@
               a1: 0,
               b1: 1,
               prefix: 'Sine',
-              threshold: 1.8045e-6,
-              snrThreshold: 118.91
+              threshold: 1.8045e-5,
+              snrThreshold: 112.5
             });
             task.done();
           });
@@ -76,8 +76,8 @@
               a1: 0,
               b1: 1,
               prefix: 'Sine',
-              threshold: 4.7684e-7,
-              snrThreshold: 130.95
+              threshold: 1.8045e-5,
+              snrThreshold: 112.67
             });
             task.done();
           });
@@ -158,8 +158,8 @@
               a1: 1,
               b1: 1,
               prefix: 'Custom',
-              threshold: 1.8478e-6,
-              snrThreshold: 122.43
+              threshold: 5.1e-5,
+              snrThreshold: 112.78
             });
             task.done();
           });
@@ -189,7 +189,7 @@
               b1: 1,
               prefix: 'Custom',
               threshold: 4.7684e-7,
-              snrThreshold: 138.76
+              snrThreshold: 133.0
             });
             task.done();
           });
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browser/remove_user_context/user_context.py b/tests/wpt/tests/webdriver/tests/bidi/browser/remove_user_context/user_context.py
index 3a5f7f6c05b..98d6a2e2c8b 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browser/remove_user_context/user_context.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browser/remove_user_context/user_context.py
@@ -1,5 +1,6 @@
 import pytest
 
+from tests.support.sync import AsyncPoll
 import webdriver.bidi.error as error
 
 from .. import get_user_context_ids
@@ -13,3 +14,62 @@ async def test_remove_context(bidi_session, create_user_context):
     await bidi_session.browser.remove_user_context(user_context=user_context)
     assert user_context not in await get_user_context_ids(bidi_session)
     assert "default" in await get_user_context_ids(bidi_session)
+
+
+@pytest.mark.parametrize("type_hint", ["tab", "window"])
+@pytest.mark.asyncio
+async def test_remove_context_closes_contexts(
+    bidi_session, subscribe_events, wait_for_event, create_user_context, type_hint
+):
+    # Subscribe to all browsing context events
+    await subscribe_events(events=["browsingContext.contextDestroyed"])
+
+    user_context_1 = await create_user_context()
+    user_context_2 = await create_user_context()
+
+    # context 1 and 2 are owned by user context 1
+    context_1 = await bidi_session.browsing_context.create(
+        user_context=user_context_1, type_hint=type_hint
+    )
+    context_2 = await bidi_session.browsing_context.create(
+        user_context=user_context_1, type_hint=type_hint
+    )
+    # context 3 and 4 are owned by user context 2
+    context_3 = await bidi_session.browsing_context.create(
+        user_context=user_context_2, type_hint=type_hint
+    )
+    context_4 = await bidi_session.browsing_context.create(
+        user_context=user_context_2, type_hint=type_hint
+    )
+
+    # Track all received browsingContext.contextDestroyed events in the events array
+    events = []
+
+    async def on_event(method, data):
+        events.append(data)
+
+    remove_listener = bidi_session.add_event_listener("browsingContext.contextDestroyed", on_event)
+
+    # destroy user context 1 and wait for context 1 and 2 to be destroyed
+    await bidi_session.browser.remove_user_context(user_context=user_context_1)
+
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(events) >= 2)
+
+    assert len(events) == 2
+    destroyed_contexts = [event["context"] for event in events]
+    assert context_1["context"] in destroyed_contexts
+    assert context_2["context"] in destroyed_contexts
+
+    # destroy user context 1 and wait for context 3 and 4 to be destroyed
+    await bidi_session.browser.remove_user_context(user_context=user_context_2)
+
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(events) >= 4)
+
+    assert len(events) == 4
+    destroyed_contexts = [event["context"] for event in events]
+    assert context_3["context"] in destroyed_contexts
+    assert context_4["context"] in destroyed_contexts
+
+    remove_listener()
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/__init__.py
index 7a3c9f61c4f..dbacac8cf89 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/__init__.py
@@ -11,7 +11,13 @@ from .. import (
 
 
 def assert_browsing_context(
-    info, context, children=None, is_root=True, parent=None, url=None, user_context = None
+    info,
+    context,
+    children=None,
+    is_root=True,
+    parent=None,
+    url=None,
+    user_context="default",
 ):
     assert "children" in info
     if children is not None:
@@ -44,8 +50,7 @@ def assert_browsing_context(
     assert "url" in info
     assert isinstance(info["url"], str)
     assert info["url"] == url
-    if user_context is not None:
-      assert info["userContext"] == user_context
+    assert info["userContext"] == user_context
 
 
 def assert_navigation_info(event, expected_navigation_info):
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 dda9b2dae0e..e8b7fc5f894 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
@@ -224,7 +224,15 @@ async def test_subscribe_to_one_context(
     remove_listener()
 
 
-async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_safe, subscribe_events, create_user_context):
+@pytest.mark.parametrize("type_hint", ["tab", "window"])
+async def test_new_user_context(
+    bidi_session,
+    wait_for_event,
+    wait_for_future_safe,
+    subscribe_events,
+    create_user_context,
+    type_hint,
+):
     events = []
 
     async def on_event(method, data):
@@ -238,7 +246,9 @@ async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_sa
     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 = await bidi_session.browsing_context.create(
+        type_hint=type_hint, user_context=user_context
+    )
     context_info = await wait_for_future_safe(on_entry)
 
     assert len(events) == 1
@@ -249,7 +259,7 @@ async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_sa
         children=None,
         url="about:blank",
         parent=None,
-        user_context=user_context
+        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 1e918713779..17f7acf2f9b 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
@@ -249,7 +249,15 @@ async def test_subscribe_to_one_context(bidi_session, subscribe_events, new_tab)
     remove_listener()
 
 
-async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_safe, subscribe_events, create_user_context):
+@pytest.mark.parametrize("type_hint", ["tab", "window"])
+async def test_new_user_context(
+    bidi_session,
+    wait_for_event,
+    wait_for_future_safe,
+    subscribe_events,
+    create_user_context,
+    type_hint,
+):
     events = []
 
     async def on_event(method, data):
@@ -262,7 +270,9 @@ async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_sa
     user_context = await create_user_context()
     assert len(events) == 0
 
-    context = await bidi_session.browsing_context.create(type_hint="tab", user_context=user_context)
+    context = await bidi_session.browsing_context.create(
+        type_hint=type_hint, user_context=user_context
+    )
     assert len(events) == 0
 
     on_entry = wait_for_event(CONTEXT_DESTROYED_EVENT)
@@ -276,7 +286,7 @@ async def test_new_user_context(bidi_session, wait_for_event, wait_for_future_sa
         children=None,
         url="about:blank",
         parent=None,
-        user_context=user_context
+        user_context=user_context,
     )
 
     remove_listener()
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/invalid.py
index de9d2963efb..3f2cc886d0e 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/invalid.py
@@ -69,3 +69,22 @@ async def test_params_user_context_invalid_type(bidi_session, value):
 async def test_params_user_context_invalid_value(bidi_session, value):
     with pytest.raises(error.NoSuchUserContextException):
         await bidi_session.browsing_context.create(type_hint="tab", user_context=value)
+
+
+async def test_params_user_context_invalid_value_with_ref_context(bidi_session):
+    reference_context = await bidi_session.browsing_context.create(type_hint="tab")
+
+    with pytest.raises(error.NoSuchUserContextException):
+        await bidi_session.browsing_context.create(
+            reference_context=reference_context["context"],
+            type_hint="tab",
+            user_context="invalid",
+        )
+
+
+async def test_params_user_context_removed_context(bidi_session, create_user_context):
+    user_context = await create_user_context()
+    await bidi_session.browser.remove_user_context(user_context=user_context)
+
+    with pytest.raises(error.NoSuchUserContextException):
+        await bidi_session.browsing_context.create(type_hint="tab", user_context=user_context)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/reference_context.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/reference_context.py
index ffc95ef41ca..6b7fd8b2be1 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/reference_context.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/reference_context.py
@@ -43,3 +43,24 @@ async def test_reference_context(bidi_session, value):
 
     await bidi_session.browsing_context.close(context=reference_context["context"])
     await bidi_session.browsing_context.close(context=new_context["context"])
+
+
+@pytest.mark.parametrize("value", ["tab", "window"])
+async def test_reference_context_with_no_user_context_set(
+    bidi_session, value, create_user_context
+):
+    user_context = await create_user_context()
+
+    reference_context = await bidi_session.browsing_context.create(
+        type_hint="tab", user_context=user_context
+    )
+    contexts = await bidi_session.browsing_context.get_tree(max_depth=0)
+
+    new_context = await bidi_session.browsing_context.create(
+        reference_context=reference_context["context"], type_hint=value
+    )
+    new_context_info = await bidi_session.browsing_context.get_tree(
+        max_depth=0, root=new_context["context"]
+    )
+
+    assert new_context_info[0]["userContext"] == user_context
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/user_context.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/user_context.py
index 64ffb1f7d85..51406262fc8 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/user_context.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/create/user_context.py
@@ -16,8 +16,7 @@ async def test_user_context(bidi_session, type_hint, create_user_context):
     assert len(contexts) == 1
 
     new_context = await bidi_session.browsing_context.create(
-        user_context=user_context,
-        type_hint=type_hint
+        user_context=user_context, type_hint=type_hint
     )
 
     contexts = await bidi_session.browsing_context.get_tree(max_depth=0)
@@ -30,5 +29,90 @@ async def test_user_context(bidi_session, type_hint, create_user_context):
         is_root=True,
         parent=None,
         url="about:blank",
-        user_context=user_context
+        user_context=user_context,
     )
+
+
+async def test_user_context_default(bidi_session, create_user_context):
+    user_context = await create_user_context()
+
+    # Create a browsing context with userContext set to "default"
+    context_1 = await bidi_session.browsing_context.create(
+        type_hint="tab", user_context="default"
+    )
+    context_tree_1 = await bidi_session.browsing_context.get_tree(
+        max_depth=0, root=context_1["context"]
+    )
+    assert_browsing_context(
+        context_tree_1[0],
+        context_1["context"],
+        url="about:blank",
+        user_context="default",
+    )
+
+    # Create a browsing context with no userContext parameter
+    context_2 = await bidi_session.browsing_context.create(
+        type_hint="tab",
+    )
+    context_tree_2 = await bidi_session.browsing_context.get_tree(
+        max_depth=0, root=context_2["context"]
+    )
+    assert_browsing_context(
+        context_tree_2[0],
+        context_2["context"],
+        url="about:blank",
+        user_context="default",
+    )
+
+
+async def test_overrides_user_context_from_reference_context(
+    bidi_session, create_user_context
+):
+    user_context_1 = await create_user_context()
+    user_context_2 = await create_user_context()
+
+    reference_context = await bidi_session.browsing_context.create(
+        type_hint="tab", user_context=user_context_1
+    )
+    reference_context_info = await bidi_session.browsing_context.get_tree(
+        max_depth=0, root=reference_context["context"]
+    )
+    assert reference_context_info[0]["userContext"] == user_context_1
+
+    new_context = await bidi_session.browsing_context.create(
+        reference_context=reference_context["context"],
+        type_hint="tab",
+        user_context=user_context_2,
+    )
+    new_context_info = await bidi_session.browsing_context.get_tree(
+        max_depth=0, root=new_context["context"]
+    )
+    assert new_context_info[0]["userContext"] == user_context_2
+
+
+async def test_user_context_nested_iframes(
+    bidi_session, create_user_context, new_tab, test_page_nested_frames
+):
+    user_context = await create_user_context()
+
+    new_context = await bidi_session.browsing_context.create(
+        user_context=user_context, type_hint="tab"
+    )
+
+    # Navigate the user context tab to a page with iframes.
+    await bidi_session.browsing_context.navigate(
+        context=new_context["context"], url=test_page_nested_frames, wait="complete"
+    )
+
+    contexts = await bidi_session.browsing_context.get_tree(root=new_context["context"])
+
+    assert len(contexts) == 1
+    root_info = contexts[0]
+
+    # Check that iframes have the same user context as the parent.
+    assert len(root_info["children"]) == 1
+    child1_info = root_info["children"][0]
+    assert child1_info["userContext"] == user_context
+    assert len(child1_info["children"]) == 1
+    child2_info = child1_info["children"][0]
+    assert child2_info["userContext"] == user_context
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 fae7f00a05c..81c664740c1 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
@@ -1,5 +1,6 @@
 import pytest
 
+from tests.support.sync import AsyncPoll
 from .. import assert_browsing_context
 
 pytestmark = pytest.mark.asyncio
@@ -91,24 +92,50 @@ async def test_cross_origin(
 
 
 @pytest.mark.parametrize("user_context", ["default", "new"])
+@pytest.mark.parametrize("domain", ["", "alt"], ids=["same_origin", "cross_origin"])
 async def test_user_context(
     bidi_session,
     create_user_context,
-    test_page,
-    test_page2,
-    test_page_multiple_frames,
-    user_context
+    subscribe_events,
+    wait_for_event,
+    inline,
+    user_context,
+    domain,
 ):
-    user_context_id = await create_user_context() if user_context == "new" else user_context
+    await subscribe_events(["browsingContext.load"])
 
-    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"
+    user_context_id = (
+        await create_user_context() if user_context == "new" else user_context
     )
 
+    iframe_url_1 = inline("<div>foo</div>", domain=domain)
+    iframe_url_2 = inline("<div>bar</div>", domain=domain)
+    page_url = inline(
+        f"<iframe src='{iframe_url_1}'></iframe><iframe src='{iframe_url_2}'></iframe>"
+    )
+
+    context = await bidi_session.browsing_context.create(
+        type_hint="tab", user_context=user_context_id
+    )
+
+    # Record all load events.
+    events = []
+    async def on_event(method, data):
+        events.append(data)
+    remove_listener = bidi_session.add_event_listener("browsingContext.load", on_event)
+
+    await bidi_session.browsing_context.navigate(
+        context=context["context"], url=page_url, wait="complete"
+    )
+
+    # Wait until all iframes have been loaded.
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(events) >= 3)
+
     top_level_context_id = context["context"]
-    all_contexts = await bidi_session.browsing_context.get_tree(root=top_level_context_id)
+    all_contexts = await bidi_session.browsing_context.get_tree(
+        root=top_level_context_id
+    )
 
     assert len(all_contexts) == 1
     root_info = all_contexts[0]
@@ -117,30 +144,39 @@ async def test_user_context(
         top_level_context_id,
         children=2,
         parent=None,
-        url=test_page_multiple_frames,
+        url=page_url,
         user_context=user_context_id,
     )
 
-    child1_info = root_info["children"][0]
+    # The contexts can be returned in any order, find the info matching iframe_url_1
+    child1_info = next(
+        filter(lambda x: x["url"] == iframe_url_1, root_info["children"]), None
+    )
+    assert child1_info is not None
+
     assert_browsing_context(
         child1_info,
         context=None,
         children=0,
         is_root=False,
         parent=None,
-        url=test_page,
+        url=iframe_url_1,
         user_context=user_context_id,
     )
     assert child1_info["context"] != root_info["context"]
 
-    child2_info = root_info["children"][1]
+    child2_info = next(
+        filter(lambda x: x["url"] == iframe_url_2, root_info["children"]), None
+    )
+    assert child2_info is not None
+
     assert_browsing_context(
         child2_info,
         context=None,
         children=0,
         is_root=False,
         parent=None,
-        url=test_page2,
+        url=iframe_url_2,
         user_context=user_context_id,
     )
     assert child2_info["context"] != root_info["context"]
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
index ffbed8cb7b1..9bbc6f5dafb 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
@@ -265,6 +265,34 @@ def assert_response_event(
     )
 
 
+# Create a simple cookie or set-cookie header. They share the same structure
+# as a regular header, so this is simple alias for create_header.
+def create_cookie_header(overrides=None, value_overrides=None):
+    return create_header(overrides, value_overrides)
+
+
+# Create a simple header dict, with mandatory name and value keys.
+# Use the `overrides` argument to update the values of those properties, or to
+# add new top-level keys.
+# Use the `value_overrides` argument to update keys nested in the `value` dict.
+def create_header(overrides=None, value_overrides=None):
+    header = {
+        "name": "test",
+        "value": {
+            "type": "string",
+            "value": "foo"
+        }
+    }
+
+    if overrides is not None:
+        header.update(overrides)
+
+    if value_overrides is not None:
+        header["value"].update(value_overrides)
+
+    return header
+
+
 # Array of status and status text expected to be available in network events
 HTTP_STATUS_AND_STATUS_TEXT = [
     (101, "Switching Protocols"),
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/conftest.py b/tests/wpt/tests/webdriver/tests/bidi/network/conftest.py
index 184073a53ab..934b649c913 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/conftest.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/conftest.py
@@ -137,11 +137,18 @@ async def setup_network_test(
 
 @pytest_asyncio.fixture
 async def setup_blocked_request(
-    setup_network_test, url, add_intercept, fetch, wait_for_event
+    bidi_session,
+    setup_network_test,
+    url,
+    add_intercept,
+    fetch,
+    wait_for_event,
+    top_context,
 ):
     """Creates an intercept for the provided phase, sends a fetch request that
     should be blocked by this intercept and resolves when the corresponding
-    event is received.
+    event is received. Pass navigate=True in order to navigate instead of doing
+    a fetch request.
 
     For the "authRequired" phase, the request will be sent to the authentication
     http handler. The optional arguments username, password and realm can be used
@@ -151,7 +158,12 @@ async def setup_blocked_request(
     """
 
     async def setup_blocked_request(
-        phase, username="user", password="password", realm="test"
+        phase,
+        context=top_context,
+        username="user",
+        password="password",
+        realm="test",
+        navigate=False,
     ):
         await setup_network_test(events=[f"network.{phase}"])
 
@@ -160,6 +172,10 @@ async def setup_blocked_request(
                 "/webdriver/tests/support/http_handlers/authentication.py?"
                 f"username={username}&password={password}&realm={realm}"
             )
+            if navigate:
+                # By default the authentication handler returns a text/plain
+                # content-type. Switch to text/html for a regular navigation.
+                blocked_url = f"{blocked_url}&contenttype=text/html"
         else:
             blocked_url = url(PAGE_EMPTY_TEXT)
 
@@ -173,7 +189,15 @@ async def setup_blocked_request(
             ],
         )
 
-        asyncio.ensure_future(fetch(blocked_url))
+        if navigate:
+            asyncio.ensure_future(
+                bidi_session.browsing_context.navigate(
+                    context=top_context["context"], url=blocked_url, wait="complete"
+                )
+            )
+        else:
+            asyncio.ensure_future(fetch(blocked_url))
+
         event = await wait_for_event(f"network.{phase}")
         request = event["request"]["request"]
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/invalid.py
index cdc66cfaabb..d7cfa629c08 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/invalid.py
@@ -1,11 +1,262 @@
+# META: timeout=long
+
 import pytest
 import webdriver.bidi.error as error
 
-from .. import PAGE_EMPTY_TEXT, RESPONSE_COMPLETED_EVENT
+from .. import (
+    create_cookie_header,
+    create_header,
+    PAGE_EMPTY_TEXT,
+    RESPONSE_COMPLETED_EVENT,
+)
 
 pytestmark = pytest.mark.asyncio
 
 
+@pytest.mark.parametrize("value", [False, 42, "foo", []])
+async def test_params_body_invalid_type(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, body=value)
+
+
+@pytest.mark.parametrize("value", [{}, {"type": "string"}, {"value": "foo"}])
+async def test_params_body_invalid_value(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, body=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_body_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request, body={"type": value, "value": "foo"}
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_body_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request, body={"type": value, "value": "foo"}
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_body_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request, body={"type": "string", "value": value}
+        )
+
+
+@pytest.mark.parametrize("value", [False, 42, "foo", {}])
+async def test_params_cookies_invalid_type(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, cookies=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_cookies_cookie_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, cookies=[value])
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_cookies_cookie_name_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(overrides={"name": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_cookies_cookie_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [{}, {"type": "string"}, {"value": "foo"}])
+async def test_params_cookies_cookie_value_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_cookies_cookie_value_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_cookies_cookie_value_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_cookies_cookie_value_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [False, 42, "foo", {}])
+async def test_params_headers_invalid_type(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, headers=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_headers_header_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(request=request, headers=[value])
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_name_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(overrides={"name": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_headers_header_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [{}, {"type": "string"}, {"value": "foo"}])
+async def test_params_headers_header_value_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_value_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_headers_header_value_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_value_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_request(
+            request=request,
+            headers=[create_header(value_overrides={"value": value})],
+        )
+
+
 @pytest.mark.parametrize("value", [False, 42, {}, []])
 async def test_params_method_invalid_type(setup_blocked_request, bidi_session, value):
     request = await setup_blocked_request("beforeRequestSent")
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/request.py b/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/request.py
new file mode 100644
index 00000000000..c55e477ad74
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/continue_request/request.py
@@ -0,0 +1,50 @@
+import pytest
+
+from .. import RESPONSE_COMPLETED_EVENT, RESPONSE_STARTED_EVENT
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_continue_fetch_request(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session
+):
+    request = await setup_blocked_request("beforeRequestSent")
+
+    await subscribe_events(
+        events=[
+            RESPONSE_STARTED_EVENT,
+            RESPONSE_COMPLETED_EVENT,
+        ]
+    )
+
+    on_response_started = wait_for_event(RESPONSE_STARTED_EVENT)
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+
+    await bidi_session.network.continue_request(request=request)
+
+    await on_response_started
+    await on_response_completed
+
+
+async def test_continue_navigation(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session
+):
+    request = await setup_blocked_request("beforeRequestSent", navigate=True)
+
+    await subscribe_events(
+        events=[
+            RESPONSE_STARTED_EVENT,
+            RESPONSE_COMPLETED_EVENT,
+            "browsingContext.load",
+        ]
+    )
+
+    on_response_started = wait_for_event(RESPONSE_STARTED_EVENT)
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+    on_load = wait_for_event("browsingContext.load")
+
+    await bidi_session.network.continue_request(request=request)
+
+    await on_response_started
+    await on_response_completed
+    await on_load
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/credentials.py b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/credentials.py
new file mode 100644
index 00000000000..3e595722cc3
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/credentials.py
@@ -0,0 +1,78 @@
+import pytest
+
+from webdriver.bidi.modules.network import AuthCredentials
+
+from tests.support.sync import AsyncPoll
+
+from .. import AUTH_REQUIRED_EVENT, RESPONSE_COMPLETED_EVENT
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.mark.parametrize("navigate", [False, True], ids=["fetch", "navigate"])
+async def test_wrong_credentials(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session, navigate
+):
+    username = f"test_missing_credentials_{navigate}"
+    password = f"test_missing_credentials_password_{navigate}"
+    request = await setup_blocked_request(
+        "authRequired", username=username, password=password, navigate=navigate
+    )
+
+    await subscribe_events(events=[AUTH_REQUIRED_EVENT])
+
+    # Continue the request blocked on authRequired, with incorrect credentials.
+    on_auth_required = wait_for_event(AUTH_REQUIRED_EVENT)
+    wrong_credentials = AuthCredentials(username=username, password="wrong_password")
+    await bidi_session.network.continue_response(
+        request=request, credentials=wrong_credentials
+    )
+    await on_auth_required
+
+
+@pytest.mark.parametrize("navigate", [False, True], ids=["fetch", "navigate"])
+async def test_correct_credentials(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session, navigate
+):
+    # Setup unique username / password because browsers cache credentials.
+    username = f"test_wrong_credentials_{navigate}"
+    password = f"test_wrong_credentials_password_{navigate}"
+    request = await setup_blocked_request(
+        "authRequired", username=username, password=password, navigate=navigate
+    )
+
+    await subscribe_events(
+        events=[AUTH_REQUIRED_EVENT, RESPONSE_COMPLETED_EVENT, "browsingContext.load"]
+    )
+
+    # Track all network.responseCompleted events.
+    response_completed_events = []
+
+    async def on_event(method, data):
+        response_completed_events.append(data)
+
+    remove_listener = bidi_session.add_event_listener(
+        RESPONSE_COMPLETED_EVENT, on_event
+    )
+
+    # Continue with the expected credentials.
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+    if navigate:
+        on_load = wait_for_event("browsingContext.load")
+
+    correct_credentials = AuthCredentials(username=username, password=password)
+    await bidi_session.network.continue_response(
+        request=request, credentials=correct_credentials
+    )
+    await on_response_completed
+    if navigate:
+        await on_load
+
+    # Wait until 2 responseCompleted events have been emitted:
+    # - one for the initial request
+    # - one for the continue with correct credentials
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(response_completed_events) >= 2)
+    assert len(response_completed_events) == 2
+
+    remove_listener()
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/invalid.py
index b8e1c08e012..2b59b3acc63 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/invalid.py
@@ -1,11 +1,389 @@
+# META: timeout=long
+
 import pytest
 import webdriver.bidi.error as error
 
-from .. import PAGE_EMPTY_TEXT, RESPONSE_COMPLETED_EVENT
+from .. import (
+    create_cookie_header,
+    create_header,
+    PAGE_EMPTY_TEXT,
+    RESPONSE_COMPLETED_EVENT,
+)
 
 pytestmark = pytest.mark.asyncio
 
 
+@pytest.mark.parametrize("value", [False, 42, "foo", {}])
+async def test_params_cookies_invalid_type(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, cookies=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_cookies_cookie_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, cookies=[value])
+
+
+@pytest.mark.parametrize(
+    "value",
+    [{}, {"name": "name"}, {"value": {"type": "string", "value": "foo"}}],
+    ids=[
+        "empty object",
+        "missing value",
+        "missing name",
+    ],
+)
+async def test_params_cookies_cookie_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[value],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_cookies_cookie_name_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"name": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_cookies_cookie_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [{}, {"type": "string"}, {"value": "foo"}])
+async def test_params_cookies_cookie_value_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_cookies_cookie_value_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_cookies_cookie_value_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("property", ["domain", "expiry", "path", "sameSite"])
+@pytest.mark.parametrize("value", [False, 42, {}, []])
+async def test_params_cookies_cookie_value_string_properties_invalid_type(
+    setup_blocked_request, bidi_session, property, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={property: value})],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_cookies_cookie_value_same_site_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"sameSite": value})],
+        )
+
+
+@pytest.mark.parametrize("property", ["httpOnly", "secure"])
+@pytest.mark.parametrize("value", [42, "foo", {}, []])
+async def test_params_cookies_cookie_value_bool_properties_invalid_type(
+    setup_blocked_request, bidi_session, property, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={property: value})],
+        )
+
+
+@pytest.mark.parametrize("value", [False, "foo", {}, []])
+async def test_params_cookies_cookie_value_max_age_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"maxAge": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [4.3])
+async def test_params_cookies_cookie_value_max_age_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(overrides={"maxAge": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, None, False, 42, {}, []])
+async def test_params_cookies_cookie_value_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            cookies=[create_cookie_header(value_overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [False, 42, "foo", []])
+async def test_params_credentials_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, credentials=value)
+
+
+@pytest.mark.parametrize(
+    "value",
+    [
+        {"type": "password", "password": "foo"},
+        {"type": "password", "username": "foo"},
+        {
+            "type": "password",
+        },
+        {
+            "username": "foo",
+            "password": "bar",
+        },
+    ],
+    ids=[
+        "missing username",
+        "missing password",
+        "missing username and password",
+        "missing type",
+    ],
+)
+async def test_params_credentials_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, credentials=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_credentials_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            credentials={
+                "type": value,
+            },
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_credentials_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            credentials={
+                "type": value,
+            },
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_credentials_username_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+    credentials = {"type": "password", "username": value, "password": "foo"}
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request, credentials=credentials
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_credentials_password_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+    credentials = {"type": "password", "username": "foo", "password": value}
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request, credentials=credentials
+        )
+
+
+@pytest.mark.parametrize("value", [False, 42, "foo", {}])
+async def test_params_headers_invalid_type(setup_blocked_request, bidi_session, value):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, headers=value)
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_headers_header_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(request=request, headers=[value])
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_name_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(overrides={"name": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, "foo", []])
+async def test_params_headers_header_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [{}, {"type": "string"}, {"value": "foo"}])
+async def test_params_headers_header_value_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(overrides={"value": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_value_type_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_headers_header_value_type_invalid_value(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(value_overrides={"type": value})],
+        )
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_headers_header_value_value_invalid_type(
+    setup_blocked_request, bidi_session, value
+):
+    request = await setup_blocked_request("responseStarted")
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.continue_response(
+            request=request,
+            headers=[create_header(value_overrides={"value": value})],
+        )
+
+
 async def test_params_request_invalid_phase(setup_blocked_request, bidi_session):
     request = await setup_blocked_request("beforeRequestSent")
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/request.py b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/request.py
new file mode 100644
index 00000000000..579f1da2882
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/continue_response/request.py
@@ -0,0 +1,57 @@
+import pytest
+
+from webdriver.bidi.modules.network import AuthCredentials
+
+from tests.support.sync import AsyncPoll
+
+from .. import AUTH_REQUIRED_EVENT, RESPONSE_COMPLETED_EVENT, RESPONSE_STARTED_EVENT
+
+pytestmark = pytest.mark.asyncio
+
+
+@pytest.mark.parametrize("navigate", [False, True], ids=["fetch", "navigate"])
+async def test_continue_auth_required(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session, navigate
+):
+    # Setup unique username / password because browsers cache credentials.
+    username = f"test_continue_auth_required_{navigate}"
+    password = f"test_continue_auth_required_password_{navigate}"
+    request = await setup_blocked_request(
+        "authRequired", username=username, password=password, navigate=navigate
+    )
+
+    await subscribe_events(
+        events=[
+            AUTH_REQUIRED_EVENT,
+        ]
+    )
+
+    # Continue the request blocked on authRequired. Without credentials, another
+    # network.authRequired should be emitted.
+    on_auth_required = wait_for_event(AUTH_REQUIRED_EVENT)
+    await bidi_session.network.continue_response(request=request)
+    await on_auth_required
+
+
+@pytest.mark.parametrize("navigate", [False, True], ids=["fetch", "navigate"])
+async def test_continue_response_started(
+    setup_blocked_request, subscribe_events, wait_for_event, bidi_session, navigate
+):
+    request = await setup_blocked_request("responseStarted", navigate=navigate)
+
+    await subscribe_events(
+        events=[
+            RESPONSE_COMPLETED_EVENT,
+            "browsingContext.load",
+        ]
+    )
+
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+    if navigate:
+        on_load = wait_for_event("browsingContext.load")
+
+    await bidi_session.network.continue_response(request=request)
+
+    await on_response_completed
+    if navigate:
+        await on_load
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/fetch_error/fetch_error.py b/tests/wpt/tests/webdriver/tests/bidi/network/fetch_error/fetch_error.py
index 35e78d8d02e..025da87c928 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/fetch_error/fetch_error.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/fetch_error/fetch_error.py
@@ -65,6 +65,26 @@ async def test_subscribe_status(
     remove_listener()
 
 
+@pytest.mark.asyncio
+async def test_aborted_request(
+    wait_for_event,
+    wait_for_future_safe,
+    setup_network_test,
+    url,
+    fetch,
+):
+    network_events = await setup_network_test(events=[FETCH_ERROR_EVENT])
+    events = network_events[FETCH_ERROR_EVENT]
+
+    # Prepare a slow url
+    slow_url = url(
+        "/webdriver/tests/bidi/browsing_context/support/empty.txt?pipe=trickle(d10)"
+    )
+    on_fetch_error = wait_for_event(FETCH_ERROR_EVENT)
+    asyncio.ensure_future(fetch(PAGE_INVALID_URL, timeout_in_seconds=0))
+    fetch_error_event = await wait_for_future_safe(on_fetch_error)
+
+
 @pytest.mark.asyncio
 async def test_iframe_load(
     bidi_session,
@@ -140,7 +160,7 @@ async def test_navigation_id(
         ("GET", False),
         ("HEAD", False),
         ("POST", False),
-        ("OPTIONS", False),
+        ("OPTIONS", True),
         ("DELETE", True),
         ("PATCH", True),
         ("PUT", True),
@@ -148,6 +168,7 @@ async def test_navigation_id(
 )
 @pytest.mark.asyncio
 async def test_request_method(
+    bidi_session,
     wait_for_event,
     wait_for_future_safe,
     fetch,
@@ -158,23 +179,30 @@ async def test_request_method(
     network_events = await setup_network_test(events=[FETCH_ERROR_EVENT])
     events = network_events[FETCH_ERROR_EVENT]
 
-    on_fetch_error = wait_for_event(FETCH_ERROR_EVENT)
     asyncio.ensure_future(fetch(PAGE_INVALID_URL, method=method))
-    await wait_for_future_safe(on_fetch_error)
 
-    assert len(events) == 1
-
-    # Requests which might update the server will fail on the CORS preflight
+    # Requests which might update the server will also fail the CORS preflight
     # request which uses the OPTIONS method.
-    if has_preflight:
-        method = "OPTIONS"
+    expected_events = 2 if has_preflight else 1
 
-    expected_request = {"method": method, "url": PAGE_INVALID_URL}
-    assert_fetch_error_event(
-        events[0],
-        expected_request=expected_request,
-        redirect_count=0,
-    )
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(events) >= expected_events)
+    assert len(events) == expected_events
+
+    # TODO: At the moment the event order for preflight requests differs between
+    # Chrome and Firefox so we cannot assume the order of fetchError events.
+    # See https://bugzilla.mozilla.org/show_bug.cgi?id=1879402.
+
+    # Check that fetch_error events have the expected methods.
+    assert method in [e["request"]["method"] for e in events]
+    if has_preflight:
+        assert "OPTIONS" in [e["request"]["method"] for e in events]
+
+    for event in events:
+        assert_fetch_error_event(
+            event,
+            expected_request={"url": PAGE_INVALID_URL},
+        )
 
 
 @pytest.mark.asyncio
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/realm_created/realm_created.py b/tests/wpt/tests/webdriver/tests/bidi/script/realm_created/realm_created.py
index 25fbbfc9f61..f4dc681a3a2 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/script/realm_created/realm_created.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/realm_created/realm_created.py
@@ -3,6 +3,7 @@ from tests.support.sync import AsyncPoll
 
 from webdriver.bidi.modules.script import RealmTarget
 from webdriver.error import TimeoutException
+from ... import any_string, recursive_compare
 from .. import create_sandbox
 
 
@@ -220,3 +221,145 @@ async def test_script_when_realm_is_created(
         )
 
     assert result == {"type": "number", "value": 3}
+
+
+async def test_dedicated_worker(
+    wait_for_future_safe,
+    bidi_session,
+    subscribe_events,
+    top_context,
+    inline,
+    event_loop,
+):
+    await subscribe_events(events=[REALM_CREATED_EVENT])
+
+    window_realm = None
+    worker_realm = event_loop.create_future()
+
+    async def on_event(method, data):
+        if data["type"] == "dedicated-worker":
+            if worker_realm.done():
+                raise "More than one dedicated worker"
+            else:
+                worker_realm.set_result(data)
+        elif data["type"] == "window":
+            nonlocal window_realm
+            window_realm = data
+
+    remove_listener = bidi_session.add_event_listener(REALM_CREATED_EVENT, on_event)
+
+    worker_url = inline("while(true){}", doctype="js")
+    url = inline(f"<script>const worker = new Worker('{worker_url}');</script>")
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+
+    realm = await wait_for_future_safe(worker_realm)
+    remove_listener()
+
+    recursive_compare(
+        {
+            "type": "dedicated-worker",
+            "realm": any_string,
+            "origin": worker_url,
+            "owners": [window_realm["realm"]],
+        },
+        realm,
+    )
+
+
+async def test_shared_worker(
+    wait_for_future_safe,
+    bidi_session,
+    subscribe_events,
+    top_context,
+    inline,
+    event_loop,
+):
+    await subscribe_events(events=[REALM_CREATED_EVENT])
+
+    window_realm = None
+    worker_realm = event_loop.create_future()
+
+    async def on_event(method, data):
+        if data["type"] == "shared-worker":
+            if worker_realm.done():
+                raise "More than one shared worker"
+            else:
+                worker_realm.set_result(data)
+        elif data["type"] == "window":
+            nonlocal window_realm
+            window_realm = data
+
+    remove_listener = bidi_session.add_event_listener(REALM_CREATED_EVENT, on_event)
+
+    worker_url = inline("while(true){}", doctype="js")
+    url = inline(
+        f"""<script>
+        const worker = new SharedWorker('{worker_url}');
+    </script>"""
+    )
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+
+    realm = await wait_for_future_safe(worker_realm)
+    remove_listener()
+
+    recursive_compare(
+        {
+            "type": "shared-worker",
+            "realm": any_string,
+            "origin": worker_url,
+        },
+        realm,
+    )
+
+
+async def test_service_worker(
+    wait_for_future_safe,
+    bidi_session,
+    subscribe_events,
+    top_context,
+    inline,
+    event_loop,
+):
+    await subscribe_events(events=[REALM_CREATED_EVENT])
+
+    window_realm = None
+    worker_realm = event_loop.create_future()
+
+    async def on_event(method, data):
+        if data["type"] == "service-worker":
+            if worker_realm.done():
+                raise "More than one service worker"
+            else:
+                worker_realm.set_result(data)
+        elif data["type"] == "window":
+            nonlocal window_realm
+            window_realm = data
+
+    remove_listener = bidi_session.add_event_listener(REALM_CREATED_EVENT, on_event)
+
+    worker_url = inline("while(true){}", doctype="js")
+    url = inline(
+        f"""<script>
+        navigator.serviceWorker.register('{worker_url}');
+        navigator.serviceWorker.startMessages();
+    </script>"""
+    )
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+
+    realm = await wait_for_future_safe(worker_realm)
+    remove_listener()
+
+    recursive_compare(
+        {
+            "type": "service-worker",
+            "realm": any_string,
+            "origin": worker_url,
+        },
+        realm,
+    )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/script/realm_destroyed/realm_destroyed.py b/tests/wpt/tests/webdriver/tests/bidi/script/realm_destroyed/realm_destroyed.py
index 15309f7aba0..ac3a67ec742 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/script/realm_destroyed/realm_destroyed.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/script/realm_destroyed/realm_destroyed.py
@@ -1,6 +1,7 @@
 import pytest
 from tests.support.sync import AsyncPoll
 from webdriver.error import TimeoutException
+from ..realm_created.realm_created import REALM_CREATED_EVENT
 
 from .. import create_sandbox
 
@@ -236,3 +237,106 @@ async def test_subscribe_to_one_context(
     assert result[0]["realm"] in destroyed_realm_ids
 
     remove_listener()
+
+
+async def test_dedicated_worker(
+    wait_for_future_safe,
+    bidi_session,
+    subscribe_events,
+    top_context,
+    inline,
+    event_loop,
+):
+    await subscribe_events(events=[REALM_CREATED_EVENT, REALM_DESTROYED_EVENT])
+
+    found = event_loop.create_future()
+    worker_realm = event_loop.create_future()
+
+    async def on_realm_created_event(method, data):
+        if data["type"] == "dedicated-worker":
+            if worker_realm.done():
+                raise "More than one dedicated worker"
+            else:
+                worker_realm.set_result(data)
+
+    async def on_realm_destroyed_event(method, data):
+        if worker_realm.done() and data["realm"] == worker_realm.result()["realm"]:
+            found.set_result(True)
+
+    remove_realm_created_listener = bidi_session.add_event_listener(
+        REALM_CREATED_EVENT, on_realm_created_event
+    )
+    remove_realm_destroyed_listener = bidi_session.add_event_listener(
+        REALM_DESTROYED_EVENT, on_realm_destroyed_event
+    )
+
+    worker_url = inline("while(true){}", doctype="js")
+    url = inline(
+        f"""<script>
+        const worker = new Worker('{worker_url}');
+        setTimeout(() => {{
+            worker.terminate();
+        }}, 100);
+    </script>"""
+    )
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+
+    assert await wait_for_future_safe(found)
+    remove_realm_created_listener()
+    remove_realm_destroyed_listener()
+
+
+async def test_shared_worker(
+    wait_for_future_safe,
+    bidi_session,
+    subscribe_events,
+    top_context,
+    inline,
+    event_loop,
+):
+    await subscribe_events(events=[REALM_CREATED_EVENT, REALM_DESTROYED_EVENT])
+
+    found = event_loop.create_future()
+    worker_realm = event_loop.create_future()
+
+    async def on_realm_created_event(method, data):
+        if data["type"] == "shared-worker":
+            if worker_realm.done():
+                raise "More than one dedicated worker"
+            else:
+                worker_realm.set_result(data)
+
+    async def on_realm_destroyed_event(method, data):
+        if worker_realm.done() and data["realm"] == worker_realm.result()["realm"]:
+            found.set_result(True)
+
+    remove_realm_created_listener = bidi_session.add_event_listener(
+        REALM_CREATED_EVENT, on_realm_created_event
+    )
+    remove_realm_destroyed_listener = bidi_session.add_event_listener(
+        REALM_DESTROYED_EVENT, on_realm_destroyed_event
+    )
+
+    worker_url = inline("while(true){}", doctype="js")
+    url = inline(
+        f"""<script>
+        const worker = new SharedWorker('{worker_url}');
+    </script>"""
+    )
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+    # Wait for the worker realm before navigating to ensure we aren't navigating
+    # too early.
+    assert await wait_for_future_safe(worker_realm)
+
+    url = inline("")
+    await bidi_session.browsing_context.navigate(
+        url=url, context=top_context["context"], wait="complete"
+    )
+    assert await wait_for_future_safe(found)
+
+    remove_realm_created_listener()
+    remove_realm_destroyed_listener()
diff --git a/tests/wpt/tests/webdriver/tests/support/http_handlers/authentication.py b/tests/wpt/tests/webdriver/tests/support/http_handlers/authentication.py
index 2526a5a4c2c..acee2d18d67 100644
--- a/tests/wpt/tests/webdriver/tests/support/http_handlers/authentication.py
+++ b/tests/wpt/tests/webdriver/tests/support/http_handlers/authentication.py
@@ -22,6 +22,10 @@ def main(request, response):
         expected_password = request.GET.first(b"password")
 
     if username == expected_username and password == expected_password:
+        if b"contenttype" in request.GET:
+            content_type = request.GET.first(b"contenttype")
+            response.headers.set(b"Content-Type", content_type)
+
         return b"Authentication done"
 
     realm = b"test"
diff --git a/tests/wpt/tests/webdriver/tests/support/inline.py b/tests/wpt/tests/webdriver/tests/support/inline.py
index ef1054c93d7..ecb2a2587b4 100644
--- a/tests/wpt/tests/webdriver/tests/support/inline.py
+++ b/tests/wpt/tests/webdriver/tests/support/inline.py
@@ -18,11 +18,13 @@ BOILERPLATES = {
   </body>
 </html>""",
     "xml": """<?xml version="1.0" encoding="{charset}"?>\n{src}""",
+    "js": "",
 }
 MIME_TYPES = {
     "html": "text/html",
     "xhtml": "application/xhtml+xml",
     "xml": "text/xml",
+    "js": "text/javascript",
 }
 
 
diff --git a/tests/wpt/tests/webrtc/RTCConfiguration-iceServers.html b/tests/wpt/tests/webrtc/RTCConfiguration-iceServers.html
index 1893ba02f30..d344cce9f86 100644
--- a/tests/wpt/tests/webrtc/RTCConfiguration-iceServers.html
+++ b/tests/wpt/tests/webrtc/RTCConfiguration-iceServers.html
@@ -309,22 +309,4 @@
       }] }));
   }, 'with url field should throw TypeError');
 
-  /*
-    4.3.2.  To set a configuration
-      11.5. If scheme name is turn or turns,
-            and server.credential is not a DOMString, then throw an InvalidAccessError
-            and abort these steps.
-   */
-  config_test(makePc => {
-    assert_throws_dom('InvalidAccessError', () =>
-      makePc({ iceServers: [{
-        urls: 'turns:turn.example.org',
-        username: 'user',
-        credential: {
-          macKey: '',
-          accessToken: ''
-        }
-      }] }));
-  }, 'with turns server, and object credential should throw InvalidAccessError');
-
 </script>