From 65beca94cd748e4974f3aed9c21c3a233551760c Mon Sep 17 00:00:00 2001
From: Servo WPT Sync <32481905+servo-wpt-sync@users.noreply.github.com>
Date: Wed, 25 Oct 2023 03:26:53 -0400
Subject: [PATCH] Sync WPT with upstream (24-10-2023) (#30607)

* wpt sync: adapt code for new TestRoot class

Fixes #30558

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

* temp change to allow wpt sync build to pass

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

* Update web-platform-tests to revision b'0d5028f200c8651b17bb224657d6e1065adcff37'

* Revert "temp change to allow wpt sync build to pass"

This reverts commit bad72c7f87c0df16085763ee15ebe63a53462ab3.

* revert metadata update for intermittent timeouts

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

---------

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>
---
 python/wpt/__init__.py                        |    6 +-
 python/wpt/manifestupdate.py                  |    8 +-
 python/wpt/update.py                          |    2 +-
 .../inline-negative-margin-001.html.ini       |    5 +-
 ...used-values-with-floats.tentative.html.ini |   12 +
 ...ound-blend-mode-computed-multiple.html.ini |   21 +
 .../border-image-image-type-001.htm.ini       |    2 +
 .../border-image-image-type-002.htm.ini       |    2 +
 .../border-image-image-type-004.htm.ini       |    2 +
 .../border-image-image-type-005.htm.ini       |    2 +
 .../box-shadow-border-radius-001.html.ini     |    2 -
 .../abspos/position-absolute-013.html.ini     |    1 +
 ...line-synthesis-vert-lr-line-under.html.ini |    2 +
 ...e-elements-font-palette-animation.html.ini |    7 +
 ...ust-unicode-range-system-fallback.html.ini |    2 +
 .../variations/font-style-parsing.html.ini    |    3 -
 .../i18n/hyphens-i18n-auto-006.html.ini       |    2 +
 .../parsing/text-spacing-computed.html.ini    |   36 +
 .../parsing/text-spacing-valid.html.ini       |   36 +
 .../white-space-shorthand-text-wrap.html.ini  |    9 +
 .../text-autospace-mixed-001.html.ini         |    2 +
 .../text-spacing-trim-colon-001.html.ini      |    5 -
 ...ext-spacing-trim-combinations-001.html.ini |   29 +
 .../text-spacing-trim-dot-001.html.ini        |    5 -
 .../text-spacing-trim-wrap-001.html.ini       |   11 +
 .../text-spacing-trim-wrap-br-001.html.ini    |   11 +
 ...space-separators-break-spaces-004.html.ini |    2 +
 ...-specified-on-animation-keyframes.html.ini |    2 +
 ...ce-visibility-hidden-animated-002.html.ini |    2 +
 ...-under-rotateY-180deg-perspective.html.ini |    2 +
 .../parsing/field-sizing-computed.html.ini    |    6 +
 .../parsing/field-sizing-valid.html.ini       |    6 +
 .../parsing/form-sizing-computed.html.ini     |   12 -
 .../css-ui/parsing/form-sizing-valid.html.ini |   12 -
 ...in-media-queries-with-mixed-units.html.ini |   21 +
 .../calc-serialization-002.html.ini           |    6 +
 ...etComputedStyle-border-radius-001.html.ini |    2 +
 ...etComputedStyle-border-radius-003.html.ini |    2 +
 ...omputedStyle-calc-mixed-units-003.html.ini |   15 +
 ...ediaQueryList-extends-EventTarget.html.ini |    3 -
 .../css/cssom-view/checkVisibility.html.ini   |    1 +
 .../offsetTopLeft-border-box.html.ini         |    6 -
 .../invalidation/has-pseudo-element.html.ini  |    2 +
 ...define-upgrade-criteria.tentative.html.ini |   39 +
 ...ry-define-upgrade-order.tentative.html.ini |   21 +
 .../observable-constructor.window.js.ini      |    9 +
 ...-brace-syntax-innerhtml.tentative.html.ini |    3 +
 .../gb18030/gb18030-decoder.any.js.ini        |  215 +
 .../gb18030/gb18030-encoder.html.ini          |  107 +
 .../redirect/redirect-keepalive.any.js.ini    |    1 +
 .../response-consume-stream.any.js.ini        |    6 +
 ...tivate-after.tentative.https.window.js.ini |    2 +
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 .../timeout.tentative.https.window.js.ini     |    2 -
 .../css-images.sub.tentative.html.ini         |    6 +-
 .../empty-iframe-load-event.html.ini          |    6 -
 .../form-submit-button-click.html.ini         |    3 +-
 .../nav-cancelation-2.sub.html.ini            |    3 +-
 ...averse_the_history_write_onload_1.html.ini |    3 -
 .../cross-origin-objects.html.ini             |    1 +
 ...creating_browsing_context_test_01.html.ini |    3 +
 ...d.fillStyle.colormix.currentcolor.html.ini |    3 +
 .../2d.fillStyle.colormix.html.ini            |    3 +
 .../2d.strokeStyle.colormix.html.ini          |    3 +
 .../layers/2d.layer.putImageData.html.ini     |    3 +
 .../text/canvas.2d.disconnected.html.ini      |    2 +-
 .../2d.fillStyle.colormix.html.ini            |    3 +
 .../2d.fillStyle.colormix.worker.js.ini       |    3 +
 .../2d.strokeStyle.colormix.html.ini          |    3 +
 .../layers/2d.layer.putImageData.html.ini     |    3 +
 .../2d.layer.putImageData.worker.js.ini       |    3 +
 ...render-opportunities.putImageData.html.ini |    2 -
 ...nder-opportunities.putImageData.w.html.ini |    2 -
 ...rtunities.transferToImageBitmap.w.html.ini |    2 -
 .../2d.layer.transferToImageBitmap.html.ini   |    3 +
 ....layer.transferToImageBitmap.worker.js.ini |    3 +
 .../dir-assorted.window.js.ini                |    3 +
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 ...-url-changes-about-srcdoc-2.https.html.ini |    4 +
 ...ld-sizing-input-number.tentative.html.ini} |    4 +-
 ...ield-sizing-input-text.tentative.html.ini} |   14 +-
 .../field-sizing-select.tentative.html.ini}   |    6 +-
 .../field-sizing-textarea.tentative.html.ini} |    4 +-
 .../iframe-loading-lazy-base-url-3.html.ini   |    3 +
 .../iframe_sandbox_popups_escaping-2.html.ini |    3 +-
 .../non-active-document.html.ini              |    6 +
 .../text-plain.window.js.ini                  |    6 -
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 .../invokers/idlharness.tentative.html.ini    |   36 +
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 .../htmlanchorelement_noopener.html.ini       |    7 +-
 .../defer-script/async-script.html.ini        |    4 +
 .../parsing/DOMContentLoaded-defer.html.ini   |    3 +
 .../module-static-import-delayed.html.ini     |    3 -
 ...arseHTMLUnsafe-encoding.tentative.html.ini |    2 +
 ...LUnsafe-style-attribute.tentative.html.ini |    2 +
 ...safe-url-base-pushstate.tentative.html.ini |   18 +
 ...arseHTMLUnsafe-url-base.tentative.html.ini |   18 +
 ...TMLUnsafe-url-moretests.tentative.html.ini |   12 +
 ...TMLUnsafe-url-pushstate.tentative.html.ini |   18 +
 ...ent-parseHTMLUnsafe-url.tentative.html.ini |   18 +
 ...ocument-parseHTMLUnsafe.tentative.html.ini |    2 +
 ...lement-setHTMLUnsafe-04.tentative.html.ini |    3 +
 .../setHTMLUnsafe.tentative.html.ini          |   15 +
 ...ob-entry-different-function-realm.html.ini |    5 +-
 .../mediasession/setactionhandler.html.ini    |    3 +
 ...rprocessor-constructor.https.window.js.ini |    3 +
 .../webmessaging/with-ports}/017.html.ini     |    0
 .../webmessaging/with-ports/018.html.ini      |    4 -
 tests/wpt/meta/MANIFEST.json                  | 4233 ++++++++++++++---
 .../inline-negative-margin-001.html.ini       |   18 -
 ...used-values-with-floats.tentative.html.ini |    6 +
 ...ound-blend-mode-computed-multiple.html.ini |   21 +
 ...line-synthesis-vert-lr-line-under.html.ini |    2 +
 ...e-elements-font-palette-animation.html.ini |    7 +
 ...ust-unicode-range-system-fallback.html.ini |    2 +
 .../at-font-face-font-matching.html.ini       |   65 +-
 .../variations/font-style-parsing.html.ini    |    3 -
 .../i18n/hyphens-i18n-auto-006.html.ini       |    2 +
 .../parsing/text-spacing-computed.html.ini    |   36 +
 .../parsing/text-spacing-valid.html.ini       |   36 +
 .../white-space-shorthand-text-wrap.html.ini  |    9 +
 .../text-autospace-mixed-001.html.ini         |    2 +
 .../text-spacing-trim-colon-001.html.ini      |    5 -
 ...ext-spacing-trim-combinations-001.html.ini |   29 +
 .../text-spacing-trim-dot-001.html.ini        |    5 -
 .../text-spacing-trim-wrap-001.html.ini       |   11 +
 .../text-spacing-trim-wrap-br-001.html.ini    |   11 +
 ...-specified-on-animation-keyframes.html.ini |    2 +
 ...ce-visibility-hidden-animated-002.html.ini |    2 +
 ...-under-rotateY-180deg-preserve-3d.html.ini |    2 +
 .../parsing/field-sizing-computed.html.ini    |    6 +
 .../parsing/field-sizing-valid.html.ini       |    6 +
 .../parsing/form-sizing-computed.html.ini     |   12 -
 .../css-ui/parsing/form-sizing-valid.html.ini |   12 -
 ...in-media-queries-with-mixed-units.html.ini |   21 +
 .../calc-serialization-002.html.ini           |    6 +
 ...etComputedStyle-border-radius-001.html.ini |    3 +
 ...etComputedStyle-border-radius-003.html.ini |    3 +
 ...omputedStyle-calc-mixed-units-003.html.ini |   15 +
 .../css/cssom-view/checkVisibility.html.ini   |    1 +
 .../invalidation/has-pseudo-element.html.ini  |    2 +
 ...define-upgrade-criteria.tentative.html.ini |   39 +
 ...ry-define-upgrade-order.tentative.html.ini |   21 +
 .../observable-constructor.window.js.ini      |    9 +
 ...-brace-syntax-innerhtml.tentative.html.ini |    3 +
 .../gb18030/gb18030-decoder.any.js.ini        |  215 +
 .../gb18030/gb18030-encoder.html.ini          |  107 +
 .../response-consume-stream.any.js.ini        |    6 +
 ...tivate-after.tentative.https.window.js.ini |    2 +
 .../basic.tentative.https.window.js.ini       |    3 +
 .../timeout.tentative.https.window.js.ini     |    2 -
 .../css-images.sub.tentative.html.ini         |    3 +
 ...lement-img-environment-change.sub.html.ini |    3 -
 ...eshow-events-iframe-contentWindow.html.ini |    5 +-
 .../load-pageshow-events-window-open.html.ini |    3 -
 ...url-return-value-handling-dynamic.html.ini |   12 -
 .../navigate-to-unparseable-url.html.ini      |    3 +
 ...avigation-unload-same-origin.window.js.ini |    0
 ...d.fillStyle.colormix.currentcolor.html.ini |    3 +
 .../2d.fillStyle.colormix.html.ini            |    3 +
 .../2d.strokeStyle.colormix.html.ini          |    3 +
 .../layers/2d.layer.putImageData.html.ini     |    3 +
 .../2d.fillStyle.colormix.html.ini            |    3 +
 .../2d.fillStyle.colormix.worker.js.ini       |    3 +
 .../2d.strokeStyle.colormix.html.ini          |    3 +
 .../layers/2d.layer.putImageData.html.ini     |    3 +
 .../2d.layer.putImageData.worker.js.ini       |    3 +
 ...render-opportunities.putImageData.html.ini |    2 -
 ...nder-opportunities.putImageData.w.html.ini |    2 -
 ...rtunities.transferToImageBitmap.w.html.ini |    2 -
 .../2d.layer.transferToImageBitmap.html.ini   |    3 +
 ....layer.transferToImageBitmap.worker.js.ini |    3 +
 .../dir-assorted.window.js.ini                |    3 +
 ....ini => dir-slots-directionality.html.ini} |   11 +-
 .../hidden-until-found-001.html.ini           |    2 +
 .../hidden-until-found-004.html.ini           |    2 +
 .../hidden-until-found-005.html.ini           |    2 +
 ...-url-changes-about-srcdoc-2.https.html.ini |    4 +
 ...ocument-with-fragment-nonexistent.html.ini |    3 +-
 .../supported-elements.html.ini               |    5 +-
 ...ld-sizing-input-number.tentative.html.ini} |    4 +-
 ...ield-sizing-input-text.tentative.html.ini} |   14 +-
 .../field-sizing-select.tentative.html.ini}   |    6 +-
 .../field-sizing-textarea.tentative.html.ini} |    4 +-
 .../iframe-loading-lazy-base-url-3.html.ini   |    3 +
 .../iframe_sandbox_popups_escaping-1.html.ini |    3 +-
 .../iframe_sandbox_popups_escaping-2.html.ini |    3 +-
 .../non-active-document.html.ini              |    6 -
 ...rm-during-planned-navigation-task.html.ini |    0
 .../html/semantics/forms/historical.html.ini  |    3 +
 .../invokers/idlharness.tentative.html.ini    |   36 +
 ...invokeelement-interface.tentative.html.ini |   33 +
 .../htmlanchorelement_noopener.html.ini       |    4 -
 ...arseHTMLUnsafe-encoding.tentative.html.ini |    2 +
 ...LUnsafe-style-attribute.tentative.html.ini |    2 +
 ...safe-url-base-pushstate.tentative.html.ini |   18 +
 ...arseHTMLUnsafe-url-base.tentative.html.ini |   18 +
 ...TMLUnsafe-url-moretests.tentative.html.ini |   12 +
 ...TMLUnsafe-url-pushstate.tentative.html.ini |   18 +
 ...ent-parseHTMLUnsafe-url.tentative.html.ini |   18 +
 ...ocument-parseHTMLUnsafe.tentative.html.ini |    2 +
 ...lement-setHTMLUnsafe-04.tentative.html.ini |    3 +
 .../setHTMLUnsafe.tentative.html.ini          |   15 +
 ...le-event-handler-settings-objects.html.ini |    3 +
 .../promise-job-entry.html.ini                |    6 +-
 .../mediasession/setactionhandler.html.ini    |    3 +
 .../quirks/line-height-calculation.html.ini   |   15 -
 ...rprocessor-constructor.https.window.js.ini |    3 +
 .../meta/webmessaging/with-ports/017.html.ini |    4 +
 tests/wpt/tests/.taskcluster.yml              |    2 +-
 .../accname/name/comp_name_from_content.html  |  244 +-
 .../wpt/tests/accname/name/comp_tooltip.html  |   34 +-
 .../security-features/subresource/video.py    |    4 +-
 .../allow_csp_from-header.html                |   16 +-
 .../embed-img-and-message-top.html.headers    |    1 +
 .../frame-src-cross-origin-load.sub.html      |   90 +-
 ...message-top-and-navigate-back.html.headers |    1 +
 .../core-aam/aria-haspopup_true-manual.html   |    4 +-
 ...ml => fedcm-auto-selected-flag.https.html} |   14 +-
 .../fedcm-basic.https.html                    |    2 +-
 .../confirm-idp-login.https.html              |   41 +
 .../cross-origin-status.https.html            |   57 +
 .../fedcm-login-status/logged-out.https.html  |   47 +
 ...-returning-account-auto-reauthn.https.html |    2 +-
 .../support/fedcm-helper.sub.js               |    6 +
 .../support/fedcm/login.html                  |    9 +
 .../support/fedcm/manifest-not-in-list.json   |    2 +-
 .../support/fedcm/manifest.py                 |    2 +-
 .../fedcm/manifest_redirect_accounts.json     |    2 +-
 .../fedcm/manifest_redirect_token.json        |    2 +-
 ...ifest_with_account_auto_selected_flag.json |    6 -
 .../manifest_with_auto_selected_flag.json     |    6 +
 .../fedcm/manifest_with_no_accounts.json      |    2 +-
 .../fedcm/manifest_with_single_account.json   |    2 +-
 .../fedcm/manifest_with_two_accounts.json     |    2 +-
 .../manifest_with_variable_accounts.json      |    6 +
 ...ag.py => token_with_auto_selected_flag.py} |    4 +-
 .../support/fedcm/variable_accounts.py        |   33 +
 .../support/mark_signedin.headers             |    2 -
 .../support/mark_signedin.sub.headers         |    4 +
 .../support/mark_signedout                    |   13 +
 .../support/mark_signedout.sub.headers        |    4 +
 ...ins-used-values-with-floats.tentative.html |   40 +
 .../normal-flow/auto-margins-used-values.html |   31 +
 ...ckground-blend-mode-computed-multiple.html |   49 +
 .../background-blend-mode-computed.html       |   11 +
 .../clip-text-dynamic-2-ref.html              |    1 -
 .../background-clip/clip-text-dynamic-2.html  |    1 -
 .../border-image-image-type-001.htm           |  Bin 2834 -> 1536 bytes
 .../border-image-image-type-002.htm           |  Bin 2900 -> 1858 bytes
 .../border-image-image-type-004.htm           |   45 +
 .../border-image-image-type-005.htm           |   45 +
 .../box-shadow-border-radius-001.html         |    2 +
 .../border-image-image-type-001-ref.html      |   22 +
 .../border-image-image-type-002-ref.html      |   39 +
 .../border-image-image-type-004-ref.html      |   40 +
 .../support/9-colored-areas-40-30-20-10.png   |  Bin 0 -> 4449 bytes
 .../support/9-colored-areas-40-30-20-10.svg   |   32 +
 .../css/css-break/background-image-003.html   |   14 +
 ...loat-pushed-to-next-fragmentainer-004.html |   13 +
 .../css-cascade/all-prop-revert-layer.html    |    3 +-
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 .../content-visibility-024.html               |    1 +
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 .../content-visibility-093.html               |   24 +
 ...content-visibility-auto-text-fragment.html |   46 +
 .../content-visibility-on-g-ref.html          |   13 +
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 .../content-visibility-on-root-svg-ref.html   |    5 +
 .../content-visibility-on-root-svg.html       |   15 +
 .../locked-frame-crash.html                   |    8 +
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 .../css/css-fonts/fallback-url-to-local.html  |    2 +-
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 create mode 100644 tests/wpt/tests/html/editing/the-hidden-attribute/resources/spacer-and-container-ref.html
 create mode 100644 tests/wpt/tests/html/rendering/the-details-element/auto-expand-details-text-fragment.html
 create mode 100644 tests/wpt/tests/html/rendering/the-details-element/resources/auto-expand-details-text-fragment.html
 rename tests/wpt/tests/html/rendering/widgets/{form-sizing-input-number.tentative.html => field-sizing-input-number.tentative.html} (97%)
 rename tests/wpt/tests/html/rendering/widgets/{form-sizing-input-text.tentative.html => field-sizing-input-text.tentative.html} (97%)
 rename tests/wpt/tests/html/rendering/widgets/{form-sizing-select.tentative.html => field-sizing-select.tentative.html} (89%)
 rename tests/wpt/tests/html/rendering/widgets/{form-sizing-textarea.tentative.html => field-sizing-textarea.tentative.html} (97%)
 create mode 100644 tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-button-closes-listbox.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard-behavior.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/idlharness.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/invokeelement-interface.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/invokeevent-dispatch-shadow.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/invokeevent-interface.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
 create mode 100644 tests/wpt/tests/html/semantics/invokers/resources/invoker-utils.js
 create mode 100644 tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base-pushstate.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-pushstate.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.html
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js
 create mode 100644 tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html
 delete mode 100644 tests/wpt/tests/images/pattern.ogv
 create mode 100644 tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/elementTiming.html.ini
 create mode 100644 tests/wpt/tests/interfaces/invokers.tentative.idl
 delete mode 100644 tests/wpt/tests/interfaces/storage-buckets.tentative.idl
 create mode 100644 tests/wpt/tests/intersection-observer/padding-clip.html
 create mode 100644 tests/wpt/tests/jpegxl/META.yml
 create mode 100644 tests/wpt/tests/jpegxl/resources/3x3.png
 create mode 100644 tests/wpt/tests/jpegxl/resources/3x3_srgb.jxl
 create mode 100644 tests/wpt/tests/jpegxl/srgb-ref.html
 create mode 100644 tests/wpt/tests/jpegxl/srgb.html
 delete mode 100644 tests/wpt/tests/long-animation-frame/tentative/loaf-callback-after-promise.html
 rename tests/wpt/tests/long-animation-frame/tentative/{loaf-iframe-popup.html => loaf-iframe.html} (85%)
 create mode 100644 tests/wpt/tests/long-animation-frame/tentative/loaf-popup.html
 create mode 100644 tests/wpt/tests/long-animation-frame/tentative/loaf-script-nested-callback.html
 create mode 100644 tests/wpt/tests/long-animation-frame/tentative/loaf-stream.html
 delete mode 100644 tests/wpt/tests/long-animation-frame/tentative/loaf-trusted-types.html
 create mode 100644 tests/wpt/tests/long-animation-frame/tentative/resources/loaf-after-callback.js
 create mode 100644 tests/wpt/tests/long-animation-frame/tentative/resources/loaf-in-microtask-after-callback.js
 create mode 100644 tests/wpt/tests/media-source/mse-for-webcodecs/tentative/media-source-webcodecs-util.js
 create mode 100644 tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-encrypted-webcodecs-appendencodedchunks-play.https.html
 delete mode 100644 tests/wpt/tests/media/2x2-green.ogv
 create mode 100644 tests/wpt/tests/mediacapture-extensions/GUM-faceFraming.https.html
 rename tests/wpt/tests/pointerevents/{coalesced_events_attributes.html => coalesced_events_attributes.https.html} (100%)
 rename tests/wpt/tests/pointerevents/{coalesced_events_attributes_under_load.html => coalesced_events_attributes_under_load.https.html} (100%)
 rename tests/wpt/tests/pointerevents/{idlharness.window.js => idlharness.https.window.js} (100%)
 create mode 100644 tests/wpt/tests/pointerevents/pointerevent_constructor.https.html
 create mode 100644 tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
 rename tests/wpt/tests/pointerevents/pointerlock/{pointerevent_getCoalescedEvents_when_pointerlocked.html => pointerevent_getCoalescedEvents_when_pointerlocked.https.html} (100%)
 rename tests/wpt/tests/pointerevents/pointerlock/{pointerevent_pointerrawupdate_in_pointerlock.html => pointerevent_pointerrawupdate_in_pointerlock.https.html} (100%)
 rename tests/wpt/tests/selection/contenteditable/{modifying-selection-with-middle-mouse-button.tentative.html => modifying-selection-with-non-primary-mouse-button.tentative.html} (70%)
 create mode 100644 tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-test-helpers.js
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text.headers
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text
 create mode 100644 tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text.headers
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-after-attachshadow.tentative.html => declarative-after-attachshadow.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-parser-interaction.tentative.html => declarative-parser-interaction.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-shadow-dom-attachment.tentative.html => declarative-shadow-dom-attachment.html} (99%)
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-shadow-dom-basic.tentative.html => declarative-shadow-dom-basic.html} (97%)
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-shadow-dom-opt-in.tentative.html => declarative-shadow-dom-opt-in.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{declarative-with-disabled-shadow.tentative.html => declarative-with-disabled-shadow.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{getinnerhtml.tentative.html => getinnerhtml.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{innerhtml-before-closing-tag.tentative.html => innerhtml-before-closing-tag.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{innerhtml-on-ordinary-template.tentative.html => innerhtml-on-ordinary-template.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{move-template-before-closing-tag.tentative.html => move-template-before-closing-tag.html} (100%)
 rename tests/wpt/tests/shadow-dom/declarative/{script-access.tentative.html => script-access.html} (100%)
 delete mode 100644 tests/wpt/tests/shadow-dom/declarative/support/helpers.js
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/innertext.tentative.html
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint-larger-than-viewport.tentative.html
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint.tentative.html
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/softnav-before-lcp-paint.tentative.html
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/softnav-between-lcp-render-and-paint.tentative.html
 create mode 100644 tests/wpt/tests/soft-navigation-heuristics/text-lcp-followed-by-anim-image-softnav-lcp.tentative.html
 create mode 100644 tests/wpt/tests/svg/linking/reftests/support/green-random-rects.svg
 create mode 100644 tests/wpt/tests/svg/linking/reftests/svgview-viewbox-override-multiple.html
 create mode 100644 tests/wpt/tests/uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html
 create mode 100644 tests/wpt/tests/wai-aria/role/contextual-roles.html
 create mode 100644 tests/wpt/tests/wai-aria/role/table-roles.html
 create mode 100644 tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js
 create mode 100644 tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/register-processor-typeerrors.js
 create mode 100644 tests/wpt/tests/webcodecs/video-encoder-content-hint.https.any.js
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/fail_request/__init__.py
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/fail_request/invalid.py
 create mode 100644 tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed_status.py

diff --git a/python/wpt/__init__.py b/python/wpt/__init__.py
index 0dd5406e319..8c9e37df750 100644
--- a/python/wpt/__init__.py
+++ b/python/wpt/__init__.py
@@ -49,13 +49,13 @@ def create_parser():
 
 
 def update_args_for_legacy_layout(kwargs: dict):
-    kwargs["test_paths"]["/"]["metadata_path"] = os.path.join(
+    kwargs["test_paths"]["/"].metadata_path = os.path.join(
         WPT_PATH, "meta-legacy-layout"
     )
-    kwargs["test_paths"]["/_mozilla/"]["metadata_path"] = os.path.join(
+    kwargs["test_paths"]["/_mozilla/"].metadata_path = os.path.join(
         WPT_PATH, "mozilla", "meta-legacy-layout"
     )
-    kwargs["test_paths"]["/_webgl/"]["metadata_path"] = os.path.join(
+    kwargs["test_paths"]["/_webgl/"].metadata_path = os.path.join(
         WPT_PATH, "webgl", "meta-legacy-layout"
     )
 
diff --git a/python/wpt/manifestupdate.py b/python/wpt/manifestupdate.py
index 09b414c0c40..c1428aa2cca 100644
--- a/python/wpt/manifestupdate.py
+++ b/python/wpt/manifestupdate.py
@@ -51,10 +51,10 @@ def update(check_clean=True, rebuild=False, **kwargs):
 
 def _update(logger, test_paths, rebuild):
     for url_base, paths in iteritems(test_paths):
-        manifest_path = os.path.join(paths["metadata_path"], "MANIFEST.json")
+        manifest_path = os.path.join(paths.metadata_path, "MANIFEST.json")
         cache_subdir = os.path.relpath(os.path.dirname(manifest_path),
                                        os.path.dirname(__file__))
-        wptmanifest.manifest.load_and_update(paths["tests_path"],
+        wptmanifest.manifest.load_and_update(paths.tests_path,
                                              manifest_path,
                                              url_base,
                                              working_copy=True,
@@ -68,8 +68,8 @@ def _check_clean(logger, test_paths):
     manifests_by_path = {}
     rv = 0
     for url_base, paths in iteritems(test_paths):
-        tests_path = paths["tests_path"]
-        manifest_path = os.path.join(paths["metadata_path"], "MANIFEST.json")
+        tests_path = paths.tests_path
+        manifest_path = os.path.join(paths.metadata_path, "MANIFEST.json")
 
         old_manifest = wptmanifest.manifest.load_and_update(tests_path,
                                                             manifest_path,
diff --git a/python/wpt/update.py b/python/wpt/update.py
index 87dfd4dfd2c..138bcfb2233 100644
--- a/python/wpt/update.py
+++ b/python/wpt/update.py
@@ -109,7 +109,7 @@ def update_tests(**kwargs) -> int:
 
     wptcommandline.set_from_config(kwargs)
     if hasattr(wptcommandline, 'check_paths'):
-        wptcommandline.check_paths(kwargs)
+        wptcommandline.check_paths(kwargs["test_paths"])
 
     if kwargs.pop("legacy_layout"):
         update_args_for_legacy_layout(kwargs)
diff --git a/tests/wpt/meta-legacy-layout/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/meta-legacy-layout/css/CSS2/linebox/inline-negative-margin-001.html.ini
index 5e3a96e5999..a057f038339 100644
--- a/tests/wpt/meta-legacy-layout/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -8,5 +8,8 @@
   [[data-expected-height\] 3]
     expected: FAIL
 
-  [[data-expected-height\] 4]
+  [[data-expected-height\] 1]
+    expected: FAIL
+
+  [[data-expected-height\] 2]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini b/tests/wpt/meta-legacy-layout/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini
new file mode 100644
index 00000000000..395354a617e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini
@@ -0,0 +1,12 @@
+[auto-margins-used-values-with-floats.tentative.html]
+  [.box 1]
+    expected: FAIL
+
+  [.box 2]
+    expected: FAIL
+
+  [.box 4]
+    expected: FAIL
+
+  [.box 5]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini b/tests/wpt/meta-legacy-layout/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini
new file mode 100644
index 00000000000..d0926a94c66
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini
@@ -0,0 +1,21 @@
+[background-blend-mode-computed-multiple.html]
+  [Property background-blend-mode value 'normal']
+    expected: FAIL
+
+  [Property background-blend-mode value 'multiply']
+    expected: FAIL
+
+  [Property background-blend-mode value 'normal, luminosity']
+    expected: FAIL
+
+  [Property background-blend-mode value 'screen, overlay']
+    expected: FAIL
+
+  [Property background-blend-mode value 'color, saturation']
+    expected: FAIL
+
+  [Property background-blend-mode value 'normal, luminosity, color']
+    expected: FAIL
+
+  [Property background-blend-mode value 'screen, overlay, screen']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-001.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-001.htm.ini
new file mode 100644
index 00000000000..a985a754b39
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-001.htm.ini
@@ -0,0 +1,2 @@
+[border-image-image-type-001.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-002.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-002.htm.ini
new file mode 100644
index 00000000000..6711f58b541
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-002.htm.ini
@@ -0,0 +1,2 @@
+[border-image-image-type-002.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-004.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-004.htm.ini
new file mode 100644
index 00000000000..0090285213f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-004.htm.ini
@@ -0,0 +1,2 @@
+[border-image-image-type-004.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-005.htm.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-005.htm.ini
new file mode 100644
index 00000000000..0f356d76e5c
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-backgrounds/border-image-image-type-005.htm.ini
@@ -0,0 +1,2 @@
+[border-image-image-type-005.htm]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-backgrounds/box-shadow-border-radius-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-backgrounds/box-shadow-border-radius-001.html.ini
deleted file mode 100644
index c4286b08e31..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-backgrounds/box-shadow-border-radius-001.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[box-shadow-border-radius-001.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/abspos/position-absolute-013.html.ini
index 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-flexbox/baseline-synthesis-vert-lr-line-under.html.ini b/tests/wpt/meta-legacy-layout/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html.ini
new file mode 100644
index 00000000000..2f9b22dc901
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html.ini
@@ -0,0 +1,2 @@
+[baseline-synthesis-vert-lr-line-under.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini b/tests/wpt/meta-legacy-layout/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini
new file mode 100644
index 00000000000..48c4d107b05
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini
@@ -0,0 +1,7 @@
+[multiple-elements-font-palette-animation.html]
+  expected: TIMEOUT
+  [Verify font-palette value of the first element after animation]
+    expected: NOTRUN
+
+  [Verify font-palette value of the second element after animation]
+    expected: NOTRUN
diff --git a/tests/wpt/meta-legacy-layout/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini b/tests/wpt/meta-legacy-layout/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini
new file mode 100644
index 00000000000..98ae70a3413
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini
@@ -0,0 +1,2 @@
+[size-adjust-unicode-range-system-fallback.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-fonts/variations/font-style-parsing.html.ini b/tests/wpt/meta-legacy-layout/css/css-fonts/variations/font-style-parsing.html.ini
deleted file mode 100644
index a4b1bcd4207..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-fonts/variations/font-style-parsing.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[font-style-parsing.html]
-  [Font-style (computed): 'oblique' followed by positive angle in radians is valid]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini
new file mode 100644
index 00000000000..dbce6b5056d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini
@@ -0,0 +1,2 @@
+[hyphens-i18n-auto-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-computed.html.ini
new file mode 100644
index 00000000000..f084a73611d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-computed.html.ini
@@ -0,0 +1,36 @@
+[text-spacing-computed.html]
+  [Property text-spacing value 'normal']
+    expected: FAIL
+
+  [Property text-spacing value 'none']
+    expected: FAIL
+
+  [Property text-spacing value 'auto']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'space-all']
+    expected: FAIL
+
+  [Property text-spacing value 'allow-end space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first allow-end']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace space-all']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first no-autospace']
+    expected: FAIL
+
+  [Property text-spacing value 'space-all no-autospace']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-valid.html.ini
new file mode 100644
index 00000000000..5e2575b4053
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/parsing/text-spacing-valid.html.ini
@@ -0,0 +1,36 @@
+[text-spacing-valid.html]
+  [e.style['text-spacing'\] = "normal" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "none" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "auto" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-all" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "allow-end space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first allow-end" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace space-all" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first no-autospace" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-all no-autospace" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
index 5ea772a381f..3c7f303ddd5 100644
--- a/tests/wpt/meta-legacy-layout/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
@@ -13,3 +13,12 @@
 
   [`white-space` should overwrite `text-wrap` on the parent]
     expected: FAIL
+
+  [`white-space` should not overwrite previous `text-wrap-style: balance`]
+    expected: FAIL
+
+  [`white-space` should overwrite previous `text-wrap-mode: nowrap`]
+    expected: FAIL
+
+  [`white-space` should overwrite `text-wrap-mode` on the parent]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-autospace/text-autospace-mixed-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-autospace/text-autospace-mixed-001.html.ini
new file mode 100644
index 00000000000..f5b0e288545
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/text-autospace/text-autospace-mixed-001.html.ini
@@ -0,0 +1,2 @@
+[text-autospace-mixed-001.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini
deleted file mode 100644
index fd495eb2ba9..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[text-spacing-trim-colon-001.html?class=chws,vrl]
-  expected: FAIL
-
-[text-spacing-trim-colon-001.html?class=halt,vrl]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
new file mode 100644
index 00000000000..36050ec9bac
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
@@ -0,0 +1,29 @@
+[text-spacing-trim-combinations-001.html?class=vrl&test=CO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=CM:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=OO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=CC:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CM:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=MO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=OO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CC:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=MO:FH]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini
deleted file mode 100644
index 22931cb6723..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[text-spacing-trim-dot-001.html?class=halt,vrl]
-  expected: FAIL
-
-[text-spacing-trim-dot-001.html?class=chws,vrl]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini
new file mode 100644
index 00000000000..98b57ffa091
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini
@@ -0,0 +1,11 @@
+[text-spacing-trim-wrap-001.html?class=chws,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=halt,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=halt,htb]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=chws,htb]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini
new file mode 100644
index 00000000000..e7f62a94cc1
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini
@@ -0,0 +1,11 @@
+[text-spacing-trim-wrap-br-001.html?class=chws,htb]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=halt,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=chws,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=halt,htb]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini b/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini
new file mode 100644
index 00000000000..3257d1b4d49
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-text/white-space/trailing-other-space-separators-break-spaces-004.html.ini
@@ -0,0 +1,2 @@
+[trailing-other-space-separators-break-spaces-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini b/tests/wpt/meta-legacy-layout/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini
new file mode 100644
index 00000000000..17a666f1965
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini
@@ -0,0 +1,2 @@
+[scale-and-rotate-both-specified-on-animation-keyframes.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/css/css-transforms/backface-visibility-hidden-animated-002.html.ini b/tests/wpt/meta-legacy-layout/css/css-transforms/backface-visibility-hidden-animated-002.html.ini
new file mode 100644
index 00000000000..90198176f4d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-transforms/backface-visibility-hidden-animated-002.html.ini
@@ -0,0 +1,2 @@
+[backface-visibility-hidden-animated-002.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/css/css-transforms/composited-under-rotateY-180deg-perspective.html.ini b/tests/wpt/meta-legacy-layout/css/css-transforms/composited-under-rotateY-180deg-perspective.html.ini
new file mode 100644
index 00000000000..d75fc0b814f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-transforms/composited-under-rotateY-180deg-perspective.html.ini
@@ -0,0 +1,2 @@
+[composited-under-rotateY-180deg-perspective.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-computed.html.ini
new file mode 100644
index 00000000000..c7eaf80f035
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-computed.html.ini
@@ -0,0 +1,6 @@
+[field-sizing-computed.html]
+  [Property field-sizing value 'fixed']
+    expected: FAIL
+
+  [Property field-sizing value 'content']
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-valid.html.ini
new file mode 100644
index 00000000000..7b58b5255f0
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/field-sizing-valid.html.ini
@@ -0,0 +1,6 @@
+[field-sizing-valid.html]
+  [e.style['field-sizing'\] = "fixed" should set the property value]
+    expected: FAIL
+
+  [e.style['field-sizing'\] = "content" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini
deleted file mode 100644
index 25c7ccdbe18..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-computed.html.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-[form-sizing-computed.html]
-  [Property form-sizing value 'auto']
-    expected: FAIL
-
-  [Property form-sizing value 'normal']
-    expected: FAIL
-
-  [Property form-sizing value 'fixed']
-    expected: FAIL
-
-  [Property form-sizing value 'content']
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini b/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini
deleted file mode 100644
index a31eb2c5cb0..00000000000
--- a/tests/wpt/meta-legacy-layout/css/css-ui/parsing/form-sizing-valid.html.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-[form-sizing-valid.html]
-  [e.style['form-sizing'\] = "auto" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "fixed" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "content" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/calc-in-media-queries-with-mixed-units.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
index 8b30f4fd190..1fdb5b722c8 100644
--- a/tests/wpt/meta-legacy-layout/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
@@ -1,3 +1,24 @@
 [calc-in-media-queries-with-mixed-units.html]
   [box should be orange if the calc between vw/em in @media was correct]
     expected: FAIL
+
+  [box should be orange if the calc between vw-em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between px/em*em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*vw/em*px/vh in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vw/px*vh in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*vw/em*px in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vw*vh*px*em/px/px/px in @media was correct]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/calc-serialization-002.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/calc-serialization-002.html.ini
new file mode 100644
index 00000000000..e7751de38e0
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-values/calc-serialization-002.html.ini
@@ -0,0 +1,6 @@
+[calc-serialization-002.html]
+  [testing calc(2 * (min(10px, 20%) + max(1rem, 2%)))]
+    expected: FAIL
+
+  [testing calc((min(10px, 20%) + max(1rem, 2%)) * 2)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-001.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-001.html.ini
index e224bac8db0..6fd1c0c8997 100644
--- a/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-001.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-001.html.ini
@@ -2,3 +2,5 @@
   [testing border-radius shorthand]
     expected: FAIL
 
+  [testing border-radius: calc(25% + 10px) calc(25% + 16px) 25% 25px / calc(25% + 20px) calc(25% + 16px) 25% 25px]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-003.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-003.html.ini
index bd84259f902..0b7ccbac4a8 100644
--- a/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-003.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-border-radius-003.html.ini
@@ -2,3 +2,5 @@
   [testing border-radius shorthand]
     expected: FAIL
 
+  [testing border-radius: calc(1% + 1px) calc(2% + 2px) calc(3% + 3px) calc(4% + 4px) / calc(5% + 5px) calc(6% + 6px) calc(7% + 7px) calc(8% + 8px)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini
new file mode 100644
index 00000000000..a1653531ac4
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini
@@ -0,0 +1,15 @@
+[getComputedStyle-calc-mixed-units-003.html]
+  [testing width: calc(5px * 10lh / 1px)]
+    expected: FAIL
+
+  [testing width: calc(20% * 0.5em / 1px)]
+    expected: FAIL
+
+  [testing width: calc(4px * 4em / 1px)]
+    expected: FAIL
+
+  [testing width: calc(400px / 4lh * 1px)]
+    expected: FAIL
+
+  [testing width: calc(20% / 0.5em * 1px)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini
deleted file mode 100644
index 3fc2e24da01..00000000000
--- a/tests/wpt/meta-legacy-layout/css/cssom-view/MediaQueryList-extends-EventTarget.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[MediaQueryList-extends-EventTarget.html]
-  [onchange removes listener]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/checkVisibility.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/checkVisibility.html.ini
index 489dd4c8c1d..18ed07cad79 100644
--- a/tests/wpt/meta-legacy-layout/css/cssom-view/checkVisibility.html.ini
+++ b/tests/wpt/meta-legacy-layout/css/cssom-view/checkVisibility.html.ini
@@ -1,4 +1,5 @@
 [checkVisibility.html]
+  expected: ERROR
   [checkVisibility on visibility:hidden element.]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini b/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini
deleted file mode 100644
index 00753fab1d1..00000000000
--- a/tests/wpt/meta-legacy-layout/css/cssom-view/offsetTopLeft-border-box.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[offsetTopLeft-border-box.html]
-  [container: 0]
-    expected: FAIL
-
-  [container: 1]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/css/selectors/invalidation/has-pseudo-element.html.ini b/tests/wpt/meta-legacy-layout/css/selectors/invalidation/has-pseudo-element.html.ini
new file mode 100644
index 00000000000..8a03d029aca
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/css/selectors/invalidation/has-pseudo-element.html.ini
@@ -0,0 +1,2 @@
+[has-pseudo-element.html]
+  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini
new file mode 100644
index 00000000000..949cc771645
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini
@@ -0,0 +1,39 @@
+[scoped-registry-define-upgrade-criteria.tentative.html]
+  [Adding definition to global registry should not affect shadow roots using scoped registry]
+    expected: FAIL
+
+  [Adding definition to global registry should affect shadow roots also using global registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry should affect all associated shadow roots]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not affect document tree scope]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not affect shadow roots using other registries]
+    expected: FAIL
+
+  [Adding definition to global registry should not upgrade nodes no longer using the registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes no longer using the registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry affects associated shadow roots in all iframes]
+    expected: FAIL
+
+  [Adding definition to scoped registry affects associated shadow roots in other frame trees]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade disconnected elements]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in constructed documents]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in detached frames]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in closed windows]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini b/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini
new file mode 100644
index 00000000000..8a6ec8f3e04
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini
@@ -0,0 +1,21 @@
+[scoped-registry-define-upgrade-order.tentative.html]
+  [Upgrade in tree order in the same tree scope]
+    expected: FAIL
+
+  [Upgrade in shadow-including tree order across tree scopes]
+    expected: FAIL
+
+  [Upgrade order does not depend on shadow root attach order]
+    expected: FAIL
+
+  [Upgrade in association order across documents, then tree order in each document]
+    expected: FAIL
+
+  [Upgrade order is not affected by DOM order between child frames]
+    expected: FAIL
+
+  [Upgrade order is affected by shadow tree adoption across documents]
+    expected: FAIL
+
+  [Elements in the "owner" window of a scoped registry are not always upgraded first]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.window.js.ini b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.window.js.ini
new file mode 100644
index 00000000000..394e39cd818
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/dom/observable/tentative/observable-constructor.window.js.ini
@@ -0,0 +1,9 @@
+[observable-constructor.window.html]
+  [No observer handlers can be invoked in detached document]
+    expected: FAIL
+
+  [Subscriber.error() does not "report the exception" even when an `error()` handler is not present, when it is invoked in a detached document]
+    expected: FAIL
+
+  [Cannot subscribe to an Observable in a detached document]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini b/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
index c68ae3e8990..31690f3ffdc 100644
--- a/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
@@ -25,3 +25,6 @@
 
   [Basic NodePart parsing]
     expected: FAIL
+
+  [Basic AttributePart cloning with values]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini b/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
index a2c563673e2..22fa459058a 100644
--- a/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
@@ -2,8 +2,223 @@
   [gb18030 decoder: two bytes 0xFE 0xFF]
     expected: FAIL
 
+  [gb18030 decoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 36]
+    expected: FAIL
+
 
 [gb18030-decoder.any.html]
   [gb18030 decoder: two bytes 0xFE 0xFF]
     expected: FAIL
 
+  [gb18030 decoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 36]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini b/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
index eeb3e0ecd46..c0680e67d8b 100644
--- a/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
+++ b/tests/wpt/meta-legacy-layout/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
@@ -650,3 +650,110 @@
   [gb18030 encoder: range 40]
     expected: FAIL
 
+  [gb18030 encoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 36]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/api/redirect/redirect-keepalive.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/api/redirect/redirect-keepalive.any.js.ini
index 73c79c76452..f61eb5b8e17 100644
--- a/tests/wpt/meta-legacy-layout/fetch/api/redirect/redirect-keepalive.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/api/redirect/redirect-keepalive.any.js.ini
@@ -1,4 +1,5 @@
 [redirect-keepalive.any.html]
+  expected: TIMEOUT
   [[keepalive\][new window\][unload\] same-origin redirect]
     expected: FAIL
 
diff --git a/tests/wpt/meta-legacy-layout/fetch/api/response/response-consume-stream.any.js.ini b/tests/wpt/meta-legacy-layout/fetch/api/response/response-consume-stream.any.js.ini
index 55025b11849..2edc6c1ac56 100644
--- a/tests/wpt/meta-legacy-layout/fetch/api/response/response-consume-stream.any.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/api/response/response-consume-stream.any.js.ini
@@ -23,6 +23,9 @@
   [Read form data response's body as readableStream with mode=byob]
     expected: FAIL
 
+  [Reading with offset from Response stream]
+    expected: FAIL
+
 
 [response-consume-stream.any.worker.html]
   [Getting a redirect Response stream]
@@ -46,6 +49,9 @@
   [Read form data response's body as readableStream with mode=byob]
     expected: FAIL
 
+  [Reading with offset from Response stream]
+    expected: FAIL
+
 
 [response-consume-stream.any.sharedworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/fetch-later/activate-after.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/fetch/fetch-later/activate-after.tentative.https.window.js.ini
new file mode 100644
index 00000000000..e6472de4e04
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/fetch/fetch-later/activate-after.tentative.https.window.js.ini
@@ -0,0 +1,2 @@
+[activate-after.tentative.https.window.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/fetch/fetch-later/basic.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/fetch/fetch-later/basic.tentative.https.window.js.ini
index c3859cd2643..3fa86d89b2d 100644
--- a/tests/wpt/meta-legacy-layout/fetch/fetch-later/basic.tentative.https.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/fetch/fetch-later/basic.tentative.https.window.js.ini
@@ -19,3 +19,6 @@
 
   [fetchLater() does not throw error when it is aborted before sending.]
     expected: FAIL
+
+  [fetchLater() throws RangeError on negative activateAfter.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/fetch/fetch-later/timeout.tentative.https.window.js.ini b/tests/wpt/meta-legacy-layout/fetch/fetch-later/timeout.tentative.https.window.js.ini
deleted file mode 100644
index 2d32eaebde7..00000000000
--- a/tests/wpt/meta-legacy-layout/fetch/fetch-later/timeout.tentative.https.window.js.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[timeout.tentative.https.window.html]
-  expected: ERROR
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 f2d7867c9ff..f0cfa5a9e3f 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
@@ -147,11 +147,11 @@
   [list-style-image sec-fetch-site - HTTPS downgrade-upgrade]
     expected: FAIL
 
-  [border-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination]
-    expected: FAIL
-
   [background-image sec-fetch-site - HTTPS downgrade (header not sent)]
     expected: TIMEOUT
 
   [border-image sec-fetch-site - HTTPS downgrade (header not sent)]
     expected: FAIL
+
+  [background-image sec-fetch-mode - Not sent to non-trustworthy same-origin destination]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
deleted file mode 100644
index 3e07e6b7d1f..00000000000
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/empty-iframe-load-event.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[empty-iframe-load-event.html]
-  [Check execution order from nested timeout]
-    expected: FAIL
-
-  [Check execution order on load handler]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
index 6c777ea167c..e84cccbbd1f 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html.ini
@@ -1,4 +1,3 @@
 [form-submit-button-click.html]
-  expected: TIMEOUT
   [Replace before load, triggered by submitButton.click()]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
index 9f7f24f662e..0e40ffc0656 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/nav-cancelation-2.sub.html.ini
@@ -1,3 +1,4 @@
 [nav-cancelation-2.sub.html]
+  expected: TIMEOUT
   [grandparent cancels a pending navigation in a cross-origin grandchild]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini
deleted file mode 100644
index 02bd301a7ca..00000000000
--- a/tests/wpt/meta-legacy-layout/html/browsers/history/the-history-interface/traverse_the_history_write_onload_1.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[traverse_the_history_write_onload_1.html]
-  [Traverse the history when a history entry is written in the load event]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/origin/cross-origin-objects/cross-origin-objects.html.ini b/tests/wpt/meta-legacy-layout/html/browsers/origin/cross-origin-objects/cross-origin-objects.html.ini
index 90eb9ed743b..24c9e5d3926 100644
--- a/tests/wpt/meta-legacy-layout/html/browsers/origin/cross-origin-objects/cross-origin-objects.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/browsers/origin/cross-origin-objects/cross-origin-objects.html.ini
@@ -1,4 +1,5 @@
 [cross-origin-objects.html]
+  expected: TIMEOUT
   [Basic sanity-checking (cross-origin)]
     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/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini
new file mode 100644
index 00000000000..96cb0842f0e
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.currentcolor.html]
+  [color-mix works as color input with currentcolor]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
new file mode 100644
index 00000000000..e8df9f60f28
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
new file mode 100644
index 00000000000..2a7000ceb36
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.strokeStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.putImageData.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.putImageData.html.ini
new file mode 100644
index 00000000000..83aac80c2c3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/layers/2d.layer.putImageData.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
index 5cdcce07c65..17247137cb1 100644
--- a/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/canvas/element/manual/text/canvas.2d.disconnected.html.ini
@@ -1,2 +1,2 @@
 [canvas.2d.disconnected.html]
-  expected: FAIL
+  expected: CRASH
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
new file mode 100644
index 00000000000..e8df9f60f28
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini
new file mode 100644
index 00000000000..697bc254c44
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.worker.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
new file mode 100644
index 00000000000..2a7000ceb36
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.strokeStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini
new file mode 100644
index 00000000000..83aac80c2c3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini
new file mode 100644
index 00000000000..70715a598da
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.worker.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini
deleted file mode 100644
index fe0c3e0eb4a..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.putImageData.html]
-  expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini
deleted file mode 100644
index 39248753058..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.putImageData.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini
deleted file mode 100644
index 93d97a15ac9..00000000000
--- a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.transferToImageBitmap.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini
new file mode 100644
index 00000000000..b0b886aadac
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.transferToImageBitmap.html]
+  [Check that calling transferToImageBitmap in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini
new file mode 100644
index 00000000000..92236401076
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.layer.transferToImageBitmap.worker.html]
+  [Check that calling transferToImageBitmap in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-assorted.window.js.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-assorted.window.js.ini
index a350126250c..4af5281ea87 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-assorted.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-assorted.window.js.ini
@@ -19,3 +19,6 @@
 
   [Non-HTML element text contents influence dir=auto]
     expected: FAIL
+
+  [text changes apply to dir=auto on further ancestor after removing dir=auto from closer ancestor]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
similarity index 65%
rename from tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
index 32cb19c22c3..2ff8bf31e7e 100644
--- a/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
@@ -1,4 +1,4 @@
-[dir-slots-directionality.tentative.html]
+[dir-slots-directionality.html]
   [Slots: Directionality: dir=rtl on slot]
     expected: FAIL
 
@@ -16,3 +16,12 @@
 
   [Slots: Directionality: dir=auto on slot with Arabic light tree content]
     expected: FAIL
+
+  [slot provides its directionality (from host) to a dir=auto container]
+    expected: FAIL
+
+  [children with dir attribute are skipped by dir=auto]
+    expected: FAIL
+
+  [slot with dir attribute is skipped by dir=auto]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini b/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
new file mode 100644
index 00000000000..d3282074e5f
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
@@ -0,0 +1,4 @@
+[document-base-url-changes-about-srcdoc-2.https.html]
+  expected: TIMEOUT
+  [wrapper promise test for timeout.]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-number.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
similarity index 74%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-number.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
index 6854f8ebcfb..7869e7d909b 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-number.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-input-number.tentative.html]
+[field-sizing-input-number.tentative.html]
   [number: Empty value]
     expected: FAIL
 
@@ -11,5 +11,5 @@
   [number: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [number: Update form-sizing property dynamically]
+  [number: Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-text.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
similarity index 87%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-text.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
index 33eabf960dd..0b2f031b4a5 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-input-text.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-input-text.tentative.html]
+[field-sizing-input-text.tentative.html]
   [text: Empty value]
     expected: FAIL
 
@@ -17,7 +17,7 @@
   [text: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [text: Update form-sizing property dynamically]
+  [text: Update field-sizing property dynamically]
     expected: FAIL
 
   [search: Empty value]
@@ -38,7 +38,7 @@
   [search: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [search: Update form-sizing property dynamically]
+  [search: Update field-sizing property dynamically]
     expected: FAIL
 
   [tel: Empty value]
@@ -59,7 +59,7 @@
   [tel: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [tel: Update form-sizing property dynamically]
+  [tel: Update field-sizing property dynamically]
     expected: FAIL
 
   [url: Empty value]
@@ -80,7 +80,7 @@
   [url: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [url: Update form-sizing property dynamically]
+  [url: Update field-sizing property dynamically]
     expected: FAIL
 
   [email: Empty value]
@@ -101,7 +101,7 @@
   [email: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [email: Update form-sizing property dynamically]
+  [email: Update field-sizing property dynamically]
     expected: FAIL
 
   [password: Empty value]
@@ -122,5 +122,5 @@
   [password: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [password: Update form-sizing property dynamically]
+  [password: Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/form-sizing-select.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini
similarity index 63%
rename from tests/wpt/meta/html/rendering/widgets/form-sizing-select.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini
index bd921cc4895..035ff8355e0 100644
--- a/tests/wpt/meta/html/rendering/widgets/form-sizing-select.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-select.tentative.html.ini
@@ -1,8 +1,8 @@
-[form-sizing-select.tentative.html]
+[field-sizing-select.tentative.html]
   [dropdown: The width should depend on the selected OPTION]
     expected: FAIL
 
-  [dropdown: Change the form-sizing value dynamically]
+  [dropdown: Change the field-sizing value dynamically]
     expected: FAIL
 
   [listbox: The size depend on the content]
@@ -11,5 +11,5 @@
   [listbox: The size attribute value is ignored]
     expected: FAIL
 
-  [listbox: Change the form-sizing value dynamically]
+  [listbox: Change the field-sizing value dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/form-sizing-textarea.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
similarity index 83%
rename from tests/wpt/meta/html/rendering/widgets/form-sizing-textarea.tentative.html.ini
rename to tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
index e7397eb411f..f596dfc1538 100644
--- a/tests/wpt/meta/html/rendering/widgets/form-sizing-textarea.tentative.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-textarea.tentative.html]
+[field-sizing-textarea.tentative.html]
   [Empty value]
     expected: FAIL
 
@@ -20,5 +20,5 @@
   [Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [Update form-sizing property dynamically]
+  [Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini
new file mode 100644
index 00000000000..6ed6fe57263
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini
@@ -0,0 +1,3 @@
+[iframe-loading-lazy-base-url-3.html]
+  [When a loading=lazy iframe is changed to eager later before loading, it loads relative to the document's base URL computed at parse-time.]
+    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/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
index 3cdeb8ebcbc..47b45e65a1c 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
@@ -1,3 +1,9 @@
 [non-active-document.html]
   [DOMParser]
     expected: FAIL
+
+  [createHTMLDocument]
+    expected: FAIL
+
+  [<template>]
+    expected: FAIL
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 7d2f24a9bb6..d2d031e78b0 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
@@ -86,9 +86,6 @@
   [text/plain: double quote in name (normal form)]
     expected: FAIL
 
-  [text/plain: double quote in name (formdata event)]
-    expected: FAIL
-
   [text/plain: double quote in value (formdata event)]
     expected: FAIL
 
@@ -179,8 +176,5 @@
   [text/plain: Basic File test (formdata event)]
     expected: FAIL
 
-  [text/plain: 0x00 in name (normal form)]
-    expected: FAIL
-
   [text/plain: Basic test (formdata event)]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
index 091da3d48a6..65019510afd 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/urlencoded2.window.js.ini
@@ -175,3 +175,12 @@
 
   [application/x-www-form-urlencoded: 0x00 in value (formdata event)]
     expected: FAIL
+
+  [application/x-www-form-urlencoded: Basic test (formdata event)]
+    expected: FAIL
+
+  [application/x-www-form-urlencoded: 0x00 in name (formdata event)]
+    expected: FAIL
+
+  [application/x-www-form-urlencoded: 0x00 in value (normal form)]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/invokers/idlharness.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/invokers/idlharness.tentative.html.ini
new file mode 100644
index 00000000000..f9d4b78a7c6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/invokers/idlharness.tentative.html.ini
@@ -0,0 +1,36 @@
+[idlharness.tentative.html]
+  [InvokeEvent interface: existence and properties of interface object]
+    expected: FAIL
+
+  [InvokeEvent interface object length]
+    expected: FAIL
+
+  [InvokeEvent interface object name]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [InvokeEvent interface: attribute invoker]
+    expected: FAIL
+
+  [InvokeEvent interface: attribute action]
+    expected: FAIL
+
+  [InvokeEvent must be primary interface of new InvokeEvent("invoke")]
+    expected: FAIL
+
+  [Stringification of new InvokeEvent("invoke")]
+    expected: FAIL
+
+  [InvokeEvent interface: new InvokeEvent("invoke") must inherit property "invoker" with the proper type]
+    expected: FAIL
+
+  [InvokeEvent interface: new InvokeEvent("invoke") must inherit property "action" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/invokers/invokeelement-interface.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/invokers/invokeelement-interface.tentative.html.ini
new file mode 100644
index 00000000000..e1534b63047
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/invokers/invokeelement-interface.tentative.html.ini
@@ -0,0 +1,33 @@
+[invokeelement-interface.tentative.html]
+  [invokeTargetElement reflects invokee HTML element]
+    expected: FAIL
+
+  [invokeTargetElement reflects set value]
+    expected: FAIL
+
+  [invokeTargetElement reflects set value across shadow root into light dom]
+    expected: FAIL
+
+  [invokeTargetElement does not reflect set value inside shadowroot]
+    expected: FAIL
+
+  [invokeTargetElement throws error on assignment of non Element]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute not present]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute empty]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute empty 2]
+    expected: FAIL
+
+  [invokeAction reflects tostring value]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute set to [\]]
+    expected: FAIL
+
+  [invokeAction reflects tostring value 2]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index 2d44172f4dc..cc18f512574 100644
--- a/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,6 +1,5 @@
 [htmlanchorelement_noopener.html]
   type: testharness
-  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name ignores an existing window with that name]
     expected: NOTRUN
 
@@ -8,10 +7,10 @@
     expected: FAIL
 
   [Check that rel=noopener with target=_top does a normal load]
-    expected: NOTRUN
+    expected: FAIL
 
   [Check that rel=noopener with target=_parent does a normal load]
-    expected: NOTRUN
+    expected: FAIL
 
   [Check that rel=noopener with target=_self does a normal load]
-    expected: NOTRUN
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini b/tests/wpt/meta-legacy-layout/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
new file mode 100644
index 00000000000..6339abba6d9
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/semantics/scripting-1/the-script-element/defer-script/async-script.html.ini
@@ -0,0 +1,4 @@
+[async-script.html?reload]
+  expected: ERROR
+
+[async-script.html?default]
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-static-import-delayed.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
deleted file mode 100644
index 53acb938c1b..00000000000
--- a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/document-write/module-static-import-delayed.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[module-static-import-delayed.html]
-  [document.write in an imported module]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini
new file mode 100644
index 00000000000..3e5e3765f44
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe-encoding.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini
new file mode 100644
index 00000000000..e7165e1d1ea
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe-style-attribute.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini
new file mode 100644
index 00000000000..3127d2e1e85
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-base-pushstate.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini
new file mode 100644
index 00000000000..b37d72aa3c6
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-base.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini
new file mode 100644
index 00000000000..32d6c23cecd
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini
@@ -0,0 +1,12 @@
+[Document-parseHTMLUnsafe-url-moretests.tentative.html]
+  [Parent window]
+    expected: FAIL
+
+  [Child window]
+    expected: FAIL
+
+  [Child window crossing navigation]
+    expected: FAIL
+
+  [Child window after navigation]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini
new file mode 100644
index 00000000000..fb694d5b88d
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-pushstate.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini
new file mode 100644
index 00000000000..1ea8ec579dd
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini
new file mode 100644
index 00000000000..fc016f8a3bf
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini
new file mode 100644
index 00000000000..b2dafdd84b3
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini
@@ -0,0 +1,3 @@
+[Element-setHTMLUnsafe-04.tentative.html]
+  [setHTMLUnsafe should leave the removed children alone.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini
new file mode 100644
index 00000000000..8dd99e73f08
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini
@@ -0,0 +1,15 @@
+[setHTMLUnsafe.tentative.html]
+  [Element: setHTMLUnsafe with no shadowdom.]
+    expected: FAIL
+
+  [Element: setHTMLUnsafe with shadowdom.]
+    expected: FAIL
+
+  [ShadowRoot: setHTMLUnsafe with no shadowdom.]
+    expected: FAIL
+
+  [ShadowRoot: setHTMLUnsafe with shadowdom.]
+    expected: FAIL
+
+  [template.setHTMLUnsafe() should modify template content fragment rather than actual children.]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
index dbe1def99e3..7237f5792de 100644
--- a/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
+++ b/tests/wpt/meta-legacy-layout/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry-different-function-realm.html.ini
@@ -1,9 +1,10 @@
 [promise-job-entry-different-function-realm.html]
+  expected: TIMEOUT
   [Fulfillment handler on fulfilled promise]
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Thenable resolution]
     expected: FAIL
@@ -12,4 +13,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta-legacy-layout/mediasession/setactionhandler.html.ini b/tests/wpt/meta-legacy-layout/mediasession/setactionhandler.html.ini
index 85d4c538b49..463ddfe654a 100644
--- a/tests/wpt/meta-legacy-layout/mediasession/setactionhandler.html.ini
+++ b/tests/wpt/meta-legacy-layout/mediasession/setactionhandler.html.ini
@@ -16,3 +16,6 @@
 
   [Test that setActionHandler("nextslide") succeeds]
     expected: FAIL
+
+  [Test that setActionHandler("enterpictureinpicture") succeeds]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini
new file mode 100644
index 00000000000..515a82f8cae
--- /dev/null
+++ b/tests/wpt/meta-legacy-layout/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini
@@ -0,0 +1,3 @@
+[audioworklet-registerprocessor-constructor.https.window.html]
+  [Verifies two TypeError cases from registerProcessor() method.]
+    expected: FAIL
diff --git a/tests/wpt/meta/webmessaging/without-ports/017.html.ini b/tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
similarity index 100%
rename from tests/wpt/meta/webmessaging/without-ports/017.html.ini
rename to tests/wpt/meta-legacy-layout/webmessaging/with-ports/017.html.ini
diff --git a/tests/wpt/meta-legacy-layout/webmessaging/with-ports/018.html.ini b/tests/wpt/meta-legacy-layout/webmessaging/with-ports/018.html.ini
deleted file mode 100644
index b7b36c1d3a4..00000000000
--- a/tests/wpt/meta-legacy-layout/webmessaging/with-ports/018.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[018.html]
-  expected: TIMEOUT
-  [origin of the script that invoked the method, javascript:]
-    expected: TIMEOUT
diff --git a/tests/wpt/meta/MANIFEST.json b/tests/wpt/meta/MANIFEST.json
index 236f80fd6fd..7495768a479 100644
--- a/tests/wpt/meta/MANIFEST.json
+++ b/tests/wpt/meta/MANIFEST.json
@@ -1663,6 +1663,13 @@
         {}
        ]
       ],
+      "locked-frame-crash.html": [
+       "dce0baa62ed6abb01f049706aced9c2df96b4ec4",
+       [
+        null,
+        {}
+       ]
+      ],
       "meter-selection-crash.html": [
        "9edca97568e288c0231ac942eeadfe397ea9e00f",
        [
@@ -1823,6 +1830,13 @@
         null,
         {}
        ]
+      ],
+      "touch-action-beside-display-locked-fixedpos-iframe-crash.html": [
+       "920305c14dd98b2f435a92217c689ec8601fbbad",
+       [
+        null,
+        {}
+       ]
       ]
      },
      "crashtests": {
@@ -2335,6 +2349,13 @@
        ]
       ]
      },
+     "dynamic-counters-crash.html": [
+      "41e98ce003750d702e2a0fa0fc144e83532b9060",
+      [
+       null,
+       {}
+      ]
+     ],
      "list-item-counter-crash.html": [
       "fc8a38c628026dc190d81e27150d8ebabb130ae2",
       [
@@ -2527,6 +2548,13 @@
         {}
        ]
       ],
+      "inline-float-parallel-flow.html": [
+       "06e80f1cd847dac2beb8fa6133723cdc906b362a",
+       [
+        null,
+        {}
+       ]
+      ],
       "inline-with-spanner-in-overflowed-container-before-multicol-float.html": [
        "69abc9bcf99a16c1529965b7bd9133a58fd295af",
        [
@@ -2856,6 +2884,20 @@
         {}
        ]
       ],
+      "oof-in-oof-multicol-in-relpos-spanner-in-multicol-in-relpos-multicol-in-multicol.html": [
+       "ed6b63e5cb99cb0452639e9cdf0451ae574943d3",
+       [
+        null,
+        {}
+       ]
+      ],
+      "oof-in-oof-multicol-in-relpos-spanner-in-spanner-multicol-in-multicol-in-multicol.html": [
+       "f52fec4fac52d4372f5411401ab7efa24f929c5c",
+       [
+        null,
+        {}
+       ]
+      ],
       "oof-in-oof-multicol-in-spanner-in-multicol-in-spanner-in-nested-multicol.html": [
        "0ee6ad4d01a5c9cd0766e42ddd95efe3eacf1de5",
        [
@@ -3059,6 +3101,13 @@
         {}
        ]
       ],
+      "text-in-inline-interrupted-by-float.html": [
+       "fbb26507a21c3d93cd47c0595f697e3e92ac9fb9",
+       [
+        null,
+        {}
+       ]
+      ],
       "trailing-parent-padding-between-spanners.html": [
        "ffd10021772d21c1db6d77bb074a77d92bd4b145",
        [
@@ -3446,6 +3495,13 @@
        {}
       ]
      ],
+     "first-line-input-image-crash.html": [
+      "66bd0330f0808bd129417733772fedcf643140d7",
+      [
+       null,
+       {}
+      ]
+     ],
      "highlight-painting-005-crash.html": [
       "3f93fc3cbe4c7459cad625b0d363c5cdc6d130c5",
       [
@@ -3862,6 +3918,13 @@
         {}
        ]
       ],
+      "text-wrap-balance-nested-blocks-crash.html": [
+       "db79cb7d2d61a0275373d3dc03216a0156e9d946",
+       [
+        null,
+        {}
+       ]
+      ],
       "trailing-space-with-cr-crash.html": [
        "48c223e352d378e10b7cc10e5e49e8613e43c380",
        [
@@ -4251,6 +4314,13 @@
      ]
     },
     "css-values": {
+     "calc-complex-sign-function-crash.html": [
+      "d890c8cdd1add0d86de555d3f8eaf380101fff72",
+      [
+       null,
+       {}
+      ]
+     ],
      "crashtests": {
       "viewport-unit-inline-style-crash.html": [
        "4c38e18781bfdbcddce02c1cc5cd3336a7529e85",
@@ -4433,6 +4503,20 @@
        {}
       ]
      ],
+     "getComputedStyle-insets-multicol-absolute-crash.html": [
+      "81b0b88be11a36013bf81a8398689e9048080e97",
+      [
+       null,
+       {}
+      ]
+     ],
+     "insert-dir-rule-in-iframe-crash.html": [
+      "4c9d7530dc359719166e16dbd93ed0088c3ca7d5",
+      [
+       null,
+       {}
+      ]
+     ],
      "removerule-invalidation-crash.html": [
       "a83f43d5faf62338cfb442468a6e9e0e011c79f2",
       [
@@ -4570,6 +4654,13 @@
     },
     "printing": {
      "crashtests": {
+      "root-element-remove-print.html": [
+       "8497e8c4fd7694ad2fb48f4338b570dea5e26463",
+       [
+        null,
+        {}
+       ]
+      ],
       "tall-inline-block-in-float-in-table-cell-print.html": [
        "c70dce2160a9c206c850df7dcd518c97a7ec0443",
        [
@@ -4629,6 +4720,13 @@
     },
     "zoom": {
      "tentative": {
+      "scroll-corner-crash.html": [
+       "0ec88deb748ba83e5408f7c126c021827e940bcf",
+       [
+        null,
+        {}
+       ]
+      ],
       "scrollbar-crash.html": [
        "791022407fd624c6cd7b1c1fec17abb3444f89af",
        [
@@ -5371,6 +5469,13 @@
        {}
       ]
      ],
+     "replace-document-root-with-object-and-mo.html": [
+      "bdad541422833382c831de19bc0c1973006448c1",
+      [
+       null,
+       {}
+      ]
+     ],
      "replace-parent-of-editing-host-on-DOMSubtreeModified.html": [
       "9d431aa860ffa70c41257b4ccf9a9d8d1ab851a2",
       [
@@ -5413,6 +5518,13 @@
        {}
       ]
      ],
+     "set-input-value-of-editing-host-after-changing-type.html": [
+      "34a15588965b1f1a975d7040f2d9a414c4d59da9",
+      [
+       null,
+       {}
+      ]
+     ],
      "textarea-will-be-blurred-by-focus-event-listener.html": [
       "bcb145c309901ce49369ae539fc338f1efb35656",
       [
@@ -5542,6 +5654,15 @@
     },
     "canvas": {
      "element": {
+      "filters": {
+       "svg-filter-crash.html": [
+        "f64379c79241409ab55535596f4cbad894f45b42",
+        [
+         null,
+         {}
+        ]
+       ]
+      },
       "manual": {
        "wide-gamut-canvas": {
         "imagedata-no-color-settings-crash.html": [
@@ -9793,7 +9914,7 @@
      ]
     ],
     "aria-haspopup_true-manual.html": [
-     "659e77cc98476f19dd31b870d53b02be67881f09",
+     "21795bfe3225cb0a3355a4dea0ea1bd7470c927f",
      [
       null,
       {}
@@ -23086,7 +23207,7 @@
      ]
     ],
     "prompt-and-watch-availability-no-device-manual.html": [
-     "7d69f09afccf6d4f91c91a80fdf9092c6c13abd9",
+     "fb3e1231bd45fda02ea159d996fabac5796306e5",
      [
       null,
       {}
@@ -31040,6 +31161,32 @@
        {}
       ]
      ],
+     "media-queries-002-print.html": [
+      "5f71f3d17a762a770d971fdc59b4765910b5b815",
+      [
+       null,
+       [
+        [
+         "/css/printing/reference/filled-green-100px-square-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "media-queries-003-print.html": [
+      "2c125296ad28772c004a32e0a4329341b32e045a",
+      [
+       null,
+       [
+        [
+         "/css/printing/media-queries-003-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "monolithic-overflow-001-print.html": [
       "f4121c3422582aad0bf12837270e696d06e68555",
       [
@@ -31339,6 +31486,45 @@
        {}
       ]
      ],
+     "monolithic-overflow-024-print.html": [
+      "6153bc98ae0534573817663c232fb4dbadf10116",
+      [
+       null,
+       [
+        [
+         "/css/printing/monolithic-overflow-024-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "monolithic-overflow-025-print.html": [
+      "3fefbc37e2ecd38e2a88847c9132c49398d322fe",
+      [
+       null,
+       [
+        [
+         "/css/printing/monolithic-overflow-025-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "negative-overflow-print.html": [
+      "158fecc5f69d6fb25b355993c55885d3ee3f82de",
+      [
+       null,
+       [
+        [
+         "/css/printing/negative-overflow-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "no-resize-event-print.html": [
       "85a44b556cd263d1026f3e6a83b6bfa97263400e",
       [
@@ -31391,6 +31577,45 @@
        {}
       ]
      ],
+     "page-margin-004-print.html": [
+      "cb9343dcf17b69fb5c52d2bef830f260798092c5",
+      [
+       null,
+       [
+        [
+         "/css/printing/page-margin-004-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "page-margin-005-print.html": [
+      "8ca80bc69724ee8f8b1801af2b08d4ac923466a1",
+      [
+       null,
+       [
+        [
+         "/css/printing/page-margin-005-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
+     "page-margin-006-print.html": [
+      "43621acf80920276c11349e4f3677ee03c6204ca",
+      [
+       null,
+       [
+        [
+         "/css/printing/page-margin-006-print-ref.html",
+         "=="
+        ]
+       ],
+       {}
+      ]
+     ],
      "page-name-001-print.html": [
       "56281bb4ed5f8b3e34401420b10504ed6c0e00fd",
       [
@@ -31560,6 +31785,45 @@
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@@ -459404,6 +460714,10 @@
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+     [
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-     "28a34bf8fbf29888bc400de26bd7402b97cae67d",
+     "de4f1ea6730481f7565072345bd41a076da93b5b",
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-     "7df3e882fa6d1d119ba00f3020dd28c764c47f04",
+     "70c9744b7437f2b56d8ae2aa1b9aea686ae89a63",
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+       "f89d7341ac6ca9379f67a3d72e05e0e2656c07d5",
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         {
@@ -586900,8 +588817,50 @@
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+      [
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+          "script",
+          "/resources/testharness.js"
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+         [
+          "script",
+          "/resources/testharnessreport.js"
+         ],
+         [
+          "script",
+          "/common/dispatcher/dispatcher.js"
+         ],
+         [
+          "script",
+          "/common/get-host-info.sub.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js"
+         ],
+         [
+          "script",
+          "/html/browsers/browsing-the-web/back-forward-cache/resources/rc-helper.js"
+         ],
+         [
+          "script",
+          "/pending-beacon/resources/pending_beacon-helper.js"
+         ]
+        ]
+       }
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@@ -586918,6 +588877,13 @@
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-         ],
-         [
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-          "/pending-beacon/resources/pending_beacon-helper.js"
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@@ -591356,10 +593280,10 @@
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+     "abort.https.window.js": [
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+       "fledge/tentative/abort.https.window.html",
        {
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          ],
          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
+         ],
+         [
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+          "long"
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+        ],
+        "timeout": "long"
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+     "auction-config.https.window.js": [
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+      [
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+       {
+        "script_metadata": [
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+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
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@@ -591407,7 +593358,7 @@
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       ],
       [
-       "fledge/tentative/auction-config.https.sub.window.html?11-15",
+       "fledge/tentative/auction-config.https.window.html?11-15",
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@@ -591420,7 +593371,7 @@
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591455,7 +593406,7 @@
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       ],
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+       "fledge/tentative/auction-config.https.window.html?16-20",
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@@ -591468,7 +593419,7 @@
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591503,7 +593454,7 @@
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       ],
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-       "fledge/tentative/auction-config.https.sub.window.html?21-last",
+       "fledge/tentative/auction-config.https.window.html?21-last",
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@@ -591516,7 +593467,7 @@
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          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591551,7 +593502,7 @@
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       ],
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+       "fledge/tentative/auction-config.https.window.html?6-10",
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@@ -591564,7 +593515,7 @@
          ],
          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591599,10 +593550,189 @@
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+     "clear-origin-joined-ad-interest-groups.https.window.js": [
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+       "fledge/tentative/clear-origin-joined-ad-interest-groups.https.window.html?1-4",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
+          "?1-4"
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+         [
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+          "?5-8"
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+         [
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+          "?9-12"
+         ],
+         [
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+          "?13-last"
+         ]
+        ],
+        "timeout": "long"
+       }
+      ],
+      [
+       "fledge/tentative/clear-origin-joined-ad-interest-groups.https.window.html?13-last",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
+          "?1-4"
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+         [
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+         [
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+          "?13-last"
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+        ],
+        "timeout": "long"
+       }
+      ],
+      [
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+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
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+       }
+      ],
+      [
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+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
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+          "long"
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+         [
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+      [
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@@ -591619,7 +593749,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591646,7 +593776,7 @@
        }
       ],
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+       "fledge/tentative/component-ads.https.window.html?11-15",
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@@ -591663,7 +593793,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591690,7 +593820,7 @@
        }
       ],
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-       "fledge/tentative/component-ads.https.sub.window.html?16-last",
+       "fledge/tentative/component-ads.https.window.html?16-last",
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         "script_metadata": [
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@@ -591707,7 +593837,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591734,7 +593864,7 @@
        }
       ],
       [
-       "fledge/tentative/component-ads.https.sub.window.html?6-10",
+       "fledge/tentative/component-ads.https.window.html?6-10",
        {
         "script_metadata": [
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@@ -591751,7 +593881,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591778,10 +593908,10 @@
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       ]
      ],
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+     "cross-origin.https.window.js": [
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+       "fledge/tentative/cross-origin.https.window.html?1-4",
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         "script_metadata": [
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@@ -591798,7 +593928,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591825,7 +593955,7 @@
        }
       ],
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-       "fledge/tentative/cross-origin.https.sub.window.html?13-last",
+       "fledge/tentative/cross-origin.https.window.html?13-last",
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@@ -591842,7 +593972,7 @@
          ],
          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591869,7 +593999,7 @@
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       ],
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+       "fledge/tentative/cross-origin.https.window.html?5-8",
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         "script_metadata": [
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@@ -591886,7 +594016,7 @@
          ],
          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591913,7 +594043,7 @@
        }
       ],
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-       "fledge/tentative/cross-origin.https.sub.window.html?9-12",
+       "fledge/tentative/cross-origin.https.window.html?9-12",
        {
         "script_metadata": [
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@@ -591930,7 +594060,7 @@
          ],
          [
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-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -591971,10 +594101,10 @@
        {}
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      ],
-     "generate-bid-recency.https.sub.window.js": [
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+     "generate-bid-recency.https.window.js": [
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        {
         "script_metadata": [
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@@ -591987,7 +594117,7 @@
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          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -592005,10 +594135,10 @@
        {}
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-     "join-leave-ad-interest-group.https.sub.window.js": [
-      "85e172ed6f824efe872afafa74228ce13fbcd7cf",
+     "join-leave-ad-interest-group-in-fenced-frame.https.window.js": [
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       [
-       "fledge/tentative/join-leave-ad-interest-group.https.sub.window.html?1-10",
+       "fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.html?1-4",
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         "script_metadata": [
          [
@@ -592021,7 +594151,130 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
+          "?1-4"
+         ],
+         [
+          "variant",
+          "?5-8"
+         ],
+         [
+          "variant",
+          "?9-last"
+         ]
+        ],
+        "timeout": "long"
+       }
+      ],
+      [
+       "fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.html?5-8",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
+          "?1-4"
+         ],
+         [
+          "variant",
+          "?5-8"
+         ],
+         [
+          "variant",
+          "?9-last"
+         ]
+        ],
+        "timeout": "long"
+       }
+      ],
+      [
+       "fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.html?9-last",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
+         ],
+         [
+          "script",
+          "/common/subset-tests.js"
+         ],
+         [
+          "timeout",
+          "long"
+         ],
+         [
+          "variant",
+          "?1-4"
+         ],
+         [
+          "variant",
+          "?5-8"
+         ],
+         [
+          "variant",
+          "?9-last"
+         ]
+        ],
+        "timeout": "long"
+       }
+      ]
+     ],
+     "join-leave-ad-interest-group.https.window.js": [
+      "77da23a7a5b9d79f0fe149bfb137b97a75445ce2",
+      [
+       "fledge/tentative/join-leave-ad-interest-group.https.window.html?1-10",
+       {
+        "script_metadata": [
+         [
+          "script",
+          "/resources/testdriver.js"
+         ],
+         [
+          "script",
+          "/common/utils.js"
+         ],
+         [
+          "script",
+          "resources/fledge-util.sub.js"
          ],
          [
           "script",
@@ -592072,7 +594325,7 @@
        }
       ],
       [
-       "fledge/tentative/join-leave-ad-interest-group.https.sub.window.html?11-20",
+       "fledge/tentative/join-leave-ad-interest-group.https.window.html?11-20",
        {
         "script_metadata": [
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@@ -592085,7 +594338,7 @@
          ],
          [
           "script",
-          "resources/fledge-util.js"
+          "resources/fledge-util.sub.js"
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@@ -592136,7 +594389,7 @@
        }
       ],
       [
-       "fledge/tentative/join-leave-ad-interest-group.https.sub.window.html?21-30",
+       "fledge/tentative/join-leave-ad-interest-group.https.window.html?21-30",
        {
         "script_metadata": [
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@@ -592149,7 +594402,7 @@
          ],
          [
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+          "resources/fledge-util.sub.js"
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@@ -592200,7 +594453,7 @@
        }
       ],
       [
-       "fledge/tentative/join-leave-ad-interest-group.https.sub.window.html?31-40",
+       "fledge/tentative/join-leave-ad-interest-group.https.window.html?31-40",
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@@ -592213,7 +594466,7 @@
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       {}
@@ -745466,9 +748191,9 @@
         ]
        ],
        "close-connecting-async.any.js": [
-        "c7ace1fca2734085705e191cd2a5e089f2306664",
+        "88005520b000b173954f4ba3042639c41206f688",
         [
-         "websockets/interfaces/WebSocket/close/close-connecting-async.any.html",
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.html?default",
          {
           "script_metadata": [
            [
@@ -745477,7 +748202,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -745500,7 +748225,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -745523,7 +748248,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -745537,7 +748262,7 @@
          }
         ],
         [
-         "websockets/interfaces/WebSocket/close/close-connecting-async.any.worker.html",
+         "websockets/interfaces/WebSocket/close/close-connecting-async.any.worker.html?default",
          {
           "script_metadata": [
            [
@@ -745546,7 +748271,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -745569,7 +748294,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -745592,7 +748317,7 @@
            ],
            [
             "variant",
-            ""
+            "?default"
            ],
            [
             "variant",
@@ -750162,7 +752887,7 @@
      ]
     ],
     "usbDevice.https.any.js": [
-     "b1b0c133ce160a314ea392514ac5b38e4cac136d",
+     "804af2afb9db3a0d5fafbeb26aed64f89badb1b3",
      [
       "webusb/usbDevice.https.any.html",
       {
@@ -754860,7 +757585,7 @@
      ]
     ],
     "shared-worker-partitioned-cookies.tentative.https.html": [
-     "e5f79cd864965af352c5ebcc4491d1311b652ef0",
+     "f17a964497969b04cd5cd23c9bcb104ff2eef57a",
      [
       null,
       {
@@ -776744,20 +779469,6 @@
        {}
       ]
      ],
-     "border-image-image-type-001.htm": [
-      "ebc152fe74bd165b68cda0953ce3ef5545aa998d",
-      [
-       null,
-       {}
-      ]
-     ],
-     "border-image-image-type-002.htm": [
-      "39adbb34d0bbc93b2375240bb75873c167c5282c",
-      [
-       null,
-       {}
-      ]
-     ],
      "border-image-outset-001.htm": [
       "db0a8f5f6bb7ecfa034ae0d53f1833e26cc45fc3",
       [
@@ -780480,7 +783191,7 @@
          ]
         ],
         "clip.py": [
-         "4cc83f2c221de8b872ecbfcfbb2cb69783a78b6e",
+         "5d2385ed4a187c25d33a1b39dc5c4e43262350d1",
          [
           null,
           {}
@@ -780494,7 +783205,7 @@
          ]
         ],
         "invalid.py": [
-         "c6efbbbb7ae0d789f0d598d0b5df552ffe8ba756",
+         "a0c0acc5b4d61677f33fc26b423a79f81d71a4a3",
          [
           null,
           {}
@@ -780528,7 +783239,7 @@
        },
        "context_created": {
         "context_created.py": [
-         "080ef581b33da81059b558f5bbabd173d10e4ad4",
+         "62e7f8dd574f8dd9c0ca8a6cc3d0dbcab4f01b94",
          [
           null,
           {}
@@ -780638,7 +783349,7 @@
        },
        "load": {
         "load.py": [
-         "d15c23e8fdd4afba7e1a7bb09a20f0f5c01da3b5",
+         "568ee51788101897bdbaa8c9dc3b1d8ee6cc235c",
          [
           null,
           {}
@@ -780712,7 +783423,7 @@
        },
        "navigation_started": {
         "navigation_started.py": [
-         "34f3a6246c8e84d631d111e89f61a446431aa327",
+         "01e28b1ba03e277d02d01b8198249f8cb1ebce0e",
          [
           null,
           {}
@@ -780811,7 +783522,7 @@
          ]
         ],
         "wait.py": [
-         "2de09b9735edb81f62a1606fee478d38487b743d",
+         "1024b787f0889865962f91849137eff402dfe38a",
          [
           null,
           {
@@ -780838,7 +783549,7 @@
        },
        "user_prompt_closed": {
         "user_prompt_closed.py": [
-         "f9283437234a294d36d49f8b051bf5da7796ac24",
+         "ffbdcec8597ec3173991c0f3fb37a066a6912f83",
          [
           null,
           {}
@@ -780847,7 +783558,7 @@
        },
        "user_prompt_opened": {
         "user_prompt_opened.py": [
-         "703f789caaf206947c713b709fcc1d500aff9b12",
+         "a24a1e86abab3dd562b96f3951b7ca0836990012",
          [
           null,
           {}
@@ -780876,7 +783587,7 @@
          ]
         ],
         "key.py": [
-         "ac3099a1ba34054a0d69ba516a7be71449043f9f",
+         "9a04a1f31d39190ebc8f02839b96dd0829493a7a",
          [
           null,
           {}
@@ -780906,7 +783617,7 @@
          ]
         ],
         "pointer_mouse.py": [
-         "c0c4d6ff9530464b8b39c934baf44e5e9e01641d",
+         "0d1902e784b82fc6cbeacc629d6b41318c8285ca",
          [
           null,
           {}
@@ -780957,7 +783668,7 @@
          ]
         ],
         "wheel.py": [
-         "2da3861f9377b00d30b0e9f9ba1c77e7ff79f066",
+         "e3ece1e2fb07e29eabb8b484e4c82eb15ccdca31",
          [
           null,
           {}
@@ -781019,7 +783730,7 @@
          ]
         ],
         "event_buffer.py": [
-         "a5f038865c74f9a39f18d9919e474eead1de0f90",
+         "f0ceeb966df2e88e4f87cdf6fbd62285ae9f5c82",
          [
           null,
           {}
@@ -781058,7 +783769,7 @@
       "network": {
        "add_intercept": {
         "add_intercept.py": [
-         "b68cf2789b9301783d82f3c9dc1e5d584fb1181b",
+         "ffe88db3085a16d878d36694eae87337423b677c",
          [
           null,
           {}
@@ -781072,14 +783783,14 @@
          ]
         ],
         "phases.py": [
-         "7dd13a46ac225ae50afdb76b5838f5b00faaff7c",
+         "c6fba726c6d5bf4aec71147df016fbb4ab69b1a8",
          [
           null,
           {}
          ]
         ],
         "url_patterns.py": [
-         "f32bc8df91d808472d6fc264040869ec24ebe0dd",
+         "c16993d1ec3f14d8716e6ec3a099c1a7477febdf",
          [
           null,
           {}
@@ -781104,6 +783815,15 @@
          ]
         ]
        },
+       "fail_request": {
+        "invalid.py": [
+         "29b653c0923580036097b98df7f466464e425ff7",
+         [
+          null,
+          {}
+         ]
+        ]
+       },
        "remove_intercept": {
         "invalid.py": [
          "4b3526bfc37d8300eebc17b548040bde588ce18b",
@@ -781113,7 +783833,7 @@
          ]
         ],
         "remove_intercept.py": [
-         "dbb439a9e52d3f1d073fd121f9519e9f0443159f",
+         "1ac0e5cb3b96c8ff3f15b0879d7c957c931a6b6c",
          [
           null,
           {
@@ -781124,7 +783844,7 @@
        },
        "response_completed": {
         "response_completed.py": [
-         "fcd5c47d8e56583a2c05430059eb3b087d250e05",
+         "6bbf8794719ad7b6eefe04506c5cdf8551fba439",
          [
           null,
           {}
@@ -781136,11 +783856,18 @@
           null,
           {}
          ]
+        ],
+        "response_completed_status.py": [
+         "c3e4761bbeebb66710bc9feee0cca923711ae0af",
+         [
+          null,
+          {}
+         ]
         ]
        },
        "response_started": {
         "response_started.py": [
-         "d3a84fd6f9711738a453d205d17f316271b9686c",
+         "d5dd4e15f9770fed6636ef64eb8c1e7f44533de4",
          [
           null,
           {}
@@ -781578,7 +784305,7 @@
        },
        "subscribe": {
         "contexts.py": [
-         "111e7ef1031cfe5471519eb444620d3412ee5d21",
+         "215393603ea7693de070a8f573446e899045771a",
          [
           null,
           {}
@@ -781601,14 +784328,14 @@
        },
        "unsubscribe": {
         "contexts.py": [
-         "ec38df3beded08754ab9bbcbf9aa5725666f7a1f",
+         "4a34b2dca154dbe91a5eed7dfd30974b773178f8",
          [
           null,
           {}
          ]
         ],
         "events.py": [
-         "728518768833ef08c37d31e2436da96ef696f4b9",
+         "f2394415b34b9a9031b1e5c58bffd2ddb0f0f5b2",
          [
           null,
           {}
diff --git a/tests/wpt/meta/css/CSS2/linebox/inline-negative-margin-001.html.ini b/tests/wpt/meta/css/CSS2/linebox/inline-negative-margin-001.html.ini
index 2c180891ceb..ba1ea35fa63 100644
--- a/tests/wpt/meta/css/CSS2/linebox/inline-negative-margin-001.html.ini
+++ b/tests/wpt/meta/css/CSS2/linebox/inline-negative-margin-001.html.ini
@@ -2,24 +2,6 @@
   [[data-expected-height\] 7]
     expected: FAIL
 
-  [[data-expected-height\] 8]
-    expected: FAIL
-
-  [[data-expected-height\] 9]
-    expected: FAIL
-
-  [[data-expected-height\] 10]
-    expected: FAIL
-
-  [[data-expected-height\] 11]
-    expected: FAIL
-
-  [[data-expected-height\] 12]
-    expected: FAIL
-
-  [[data-expected-height\] 13]
-    expected: FAIL
-
   [[data-expected-height\] 9]
     expected: FAIL
 
diff --git a/tests/wpt/meta/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini b/tests/wpt/meta/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini
new file mode 100644
index 00000000000..b957abd9af4
--- /dev/null
+++ b/tests/wpt/meta/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html.ini
@@ -0,0 +1,6 @@
+[auto-margins-used-values-with-floats.tentative.html]
+  [.box 2]
+    expected: FAIL
+
+  [.box 5]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini b/tests/wpt/meta/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini
new file mode 100644
index 00000000000..d0926a94c66
--- /dev/null
+++ b/tests/wpt/meta/css/compositing/parsing/background-blend-mode-computed-multiple.html.ini
@@ -0,0 +1,21 @@
+[background-blend-mode-computed-multiple.html]
+  [Property background-blend-mode value 'normal']
+    expected: FAIL
+
+  [Property background-blend-mode value 'multiply']
+    expected: FAIL
+
+  [Property background-blend-mode value 'normal, luminosity']
+    expected: FAIL
+
+  [Property background-blend-mode value 'screen, overlay']
+    expected: FAIL
+
+  [Property background-blend-mode value 'color, saturation']
+    expected: FAIL
+
+  [Property background-blend-mode value 'normal, luminosity, color']
+    expected: FAIL
+
+  [Property background-blend-mode value 'screen, overlay, screen']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html.ini b/tests/wpt/meta/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html.ini
new file mode 100644
index 00000000000..2f9b22dc901
--- /dev/null
+++ b/tests/wpt/meta/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html.ini
@@ -0,0 +1,2 @@
+[baseline-synthesis-vert-lr-line-under.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini b/tests/wpt/meta/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini
new file mode 100644
index 00000000000..48c4d107b05
--- /dev/null
+++ b/tests/wpt/meta/css/css-fonts/animations/multiple-elements-font-palette-animation.html.ini
@@ -0,0 +1,7 @@
+[multiple-elements-font-palette-animation.html]
+  expected: TIMEOUT
+  [Verify font-palette value of the first element after animation]
+    expected: NOTRUN
+
+  [Verify font-palette value of the second element after animation]
+    expected: NOTRUN
diff --git a/tests/wpt/meta/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini b/tests/wpt/meta/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini
new file mode 100644
index 00000000000..98ae70a3413
--- /dev/null
+++ b/tests/wpt/meta/css/css-fonts/size-adjust-unicode-range-system-fallback.html.ini
@@ -0,0 +1,2 @@
+[size-adjust-unicode-range-system-fallback.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini b/tests/wpt/meta/css/css-fonts/variations/at-font-face-font-matching.html.ini
index ca491f611bd..02f4760ad1c 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
@@ -17,9 +17,6 @@
   [Matching font-weight: '400' should prefer '350 399' over '351 398']
     expected: FAIL
 
-  [Matching font-weight: '400' should prefer '501 550' over '502 560']
-    expected: FAIL
-
   [Matching font-weight: '430' should prefer '420 440' over '450 460']
     expected: FAIL
 
@@ -53,9 +50,6 @@
   [Matching font-style: 'normal' should prefer 'oblique 0deg' over 'oblique 10deg 40deg']
     expected: FAIL
 
-  [Matching font-style: 'italic' should prefer 'oblique 40deg 50deg' over 'oblique 5deg 10deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 20deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
     expected: FAIL
 
@@ -110,9 +104,6 @@
   [Matching font-style: 'oblique 10deg' should prefer 'oblique 15deg 20deg' over 'oblique 30deg 60deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 0deg' should prefer 'oblique 0deg' over 'oblique 5deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -20deg' should prefer 'oblique -20deg' over 'oblique -60deg -40deg']
     expected: FAIL
 
@@ -143,9 +134,6 @@
   [Matching font-style: 'oblique -20deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
     expected: FAIL
 
-  [Matching font-stretch: '100%' should prefer '110% 120%' over '115% 116%']
-    expected: FAIL
-
   [Matching font-weight: '501' should prefer '503 520' over '500']
     expected: FAIL
 
@@ -170,9 +158,6 @@
   [Matching font-stretch: '110%' should prefer '50% 80%' over '60% 70%']
     expected: FAIL
 
-  [Matching font-style: 'oblique 10deg' should prefer 'oblique 10deg' over 'oblique 5deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -20deg' should prefer 'italic' over 'oblique 0deg']
     expected: FAIL
 
@@ -191,27 +176,15 @@
   [Matching font-weight: '400' should prefer '351 398' over '501 550']
     expected: FAIL
 
-  [Matching font-weight: '399' should prefer '200 300' over '400']
-    expected: FAIL
-
-  [Matching font-style: 'oblique 21deg' should prefer 'italic' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -10deg' should prefer 'oblique -50deg -40deg' over 'italic']
     expected: FAIL
 
   [Matching font-style: 'normal' should prefer 'oblique 10deg 40deg' over 'oblique 20deg 30deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique 20deg' should prefer 'italic' over 'oblique 0deg']
-    expected: FAIL
-
   [Matching font-weight: '430' should prefer '450 460' over '500']
     expected: FAIL
 
-  [Matching font-stretch: '110%' should prefer '110% 120%' over '115% 116%']
-    expected: FAIL
-
   [Matching font-style: 'italic' should prefer 'italic' over 'oblique 20deg']
     expected: FAIL
 
@@ -230,18 +203,9 @@
   [Matching font-weight: '500' should prefer '500' over '450 460']
     expected: FAIL
 
-  [Matching font-style: 'normal' should prefer 'oblique -50deg -20deg' over 'oblique -40deg -30deg']
-    expected: FAIL
-
-  [Matching font-style: 'oblique 21deg' should prefer 'oblique 20deg' over 'oblique 10deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique 21deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -21deg' should prefer 'oblique -10deg' over 'italic']
-    expected: FAIL
-
   [Matching font-style: 'oblique -21deg' should prefer 'italic' over 'oblique 0deg']
     expected: FAIL
 
@@ -269,20 +233,35 @@
   [Matching font-style: 'italic' should prefer 'oblique 5deg' over 'normal']
     expected: FAIL
 
-  [Matching font-style: 'oblique 20deg' should prefer 'oblique 10deg' over 'italic']
-    expected: FAIL
-
   [Matching font-style: 'oblique 10deg' should prefer 'oblique 0deg' over 'oblique -50deg -20deg']
     expected: FAIL
 
   [Matching font-style: 'oblique 0deg' should prefer 'italic' over 'oblique -50deg -20deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -20deg' should prefer 'oblique -60deg -40deg' over 'oblique -10deg']
-    expected: FAIL
-
   [Matching font-style: 'oblique -21deg' should prefer 'oblique -21deg' over 'oblique -60deg -40deg']
     expected: FAIL
 
-  [Matching font-style: 'oblique -21deg' should prefer 'oblique 0deg' over 'oblique 30deg 60deg']
+  [Matching font-weight: '500' should prefer '350 399' over '351 398']
+    expected: FAIL
+
+  [Matching font-weight: '501' should prefer '450 460' over '390 410']
+    expected: FAIL
+
+  [Matching font-stretch: '90%' should prefer '90% 100%' over '50% 80%']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 21deg' should prefer 'oblique 10deg' over 'italic']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'oblique 30deg 60deg' over 'oblique 40deg 50deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique 10deg' should prefer 'oblique 40deg 50deg' over 'italic']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -10deg' should prefer 'italic' over 'oblique 0deg 10deg']
+    expected: FAIL
+
+  [Matching font-style: 'oblique -21deg' should prefer 'oblique -60deg -40deg' over 'oblique -10deg']
     expected: FAIL
diff --git a/tests/wpt/meta/css/css-fonts/variations/font-style-parsing.html.ini b/tests/wpt/meta/css/css-fonts/variations/font-style-parsing.html.ini
deleted file mode 100644
index a4b1bcd4207..00000000000
--- a/tests/wpt/meta/css/css-fonts/variations/font-style-parsing.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[font-style-parsing.html]
-  [Font-style (computed): 'oblique' followed by positive angle in radians is valid]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini b/tests/wpt/meta/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini
new file mode 100644
index 00000000000..dbce6b5056d
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html.ini
@@ -0,0 +1,2 @@
+[hyphens-i18n-auto-006.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/parsing/text-spacing-computed.html.ini b/tests/wpt/meta/css/css-text/parsing/text-spacing-computed.html.ini
new file mode 100644
index 00000000000..f084a73611d
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/parsing/text-spacing-computed.html.ini
@@ -0,0 +1,36 @@
+[text-spacing-computed.html]
+  [Property text-spacing value 'normal']
+    expected: FAIL
+
+  [Property text-spacing value 'none']
+    expected: FAIL
+
+  [Property text-spacing value 'auto']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'space-all']
+    expected: FAIL
+
+  [Property text-spacing value 'allow-end space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first allow-end']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace space-first']
+    expected: FAIL
+
+  [Property text-spacing value 'no-autospace space-all']
+    expected: FAIL
+
+  [Property text-spacing value 'space-first no-autospace']
+    expected: FAIL
+
+  [Property text-spacing value 'space-all no-autospace']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/parsing/text-spacing-valid.html.ini b/tests/wpt/meta/css/css-text/parsing/text-spacing-valid.html.ini
new file mode 100644
index 00000000000..5e2575b4053
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/parsing/text-spacing-valid.html.ini
@@ -0,0 +1,36 @@
+[text-spacing-valid.html]
+  [e.style['text-spacing'\] = "normal" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "none" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "auto" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-all" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "allow-end space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first allow-end" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace space-first" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "no-autospace space-all" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-first no-autospace" should set the property value]
+    expected: FAIL
+
+  [e.style['text-spacing'\] = "space-all no-autospace" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini b/tests/wpt/meta/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
index 5ea772a381f..3c7f303ddd5 100644
--- a/tests/wpt/meta/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
+++ b/tests/wpt/meta/css/css-text/parsing/white-space-shorthand-text-wrap.html.ini
@@ -13,3 +13,12 @@
 
   [`white-space` should overwrite `text-wrap` on the parent]
     expected: FAIL
+
+  [`white-space` should not overwrite previous `text-wrap-style: balance`]
+    expected: FAIL
+
+  [`white-space` should overwrite previous `text-wrap-mode: nowrap`]
+    expected: FAIL
+
+  [`white-space` should overwrite `text-wrap-mode` on the parent]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-autospace/text-autospace-mixed-001.html.ini b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-mixed-001.html.ini
new file mode 100644
index 00000000000..f5b0e288545
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-autospace/text-autospace-mixed-001.html.ini
@@ -0,0 +1,2 @@
+[text-autospace-mixed-001.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini
deleted file mode 100644
index fd495eb2ba9..00000000000
--- a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[text-spacing-trim-colon-001.html?class=chws,vrl]
-  expected: FAIL
-
-[text-spacing-trim-colon-001.html?class=halt,vrl]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
new file mode 100644
index 00000000000..01b20fa4a74
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html.ini
@@ -0,0 +1,29 @@
+[text-spacing-trim-combinations-001.html?class=vrl&test=CC:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CM:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=OO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=OO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=MO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CC:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=CO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=MO:FH]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=vrl&test=CM:HF]
+  expected: ERROR
+
+[text-spacing-trim-combinations-001.html?class=htb&test=CO:FH]
+  expected: ERROR
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini
deleted file mode 100644
index d32610f01e8..00000000000
--- a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[text-spacing-trim-dot-001.html?class=chws,vrl]
-  expected: FAIL
-
-[text-spacing-trim-dot-001.html?class=halt,vrl]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini
new file mode 100644
index 00000000000..70aaa017b6b
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html.ini
@@ -0,0 +1,11 @@
+[text-spacing-trim-wrap-001.html?class=halt,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=chws,htb]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=chws,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-001.html?class=halt,htb]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini
new file mode 100644
index 00000000000..171fe62dd0c
--- /dev/null
+++ b/tests/wpt/meta/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html.ini
@@ -0,0 +1,11 @@
+[text-spacing-trim-wrap-br-001.html?class=chws,htb]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=halt,vrl]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=halt,htb]
+  expected: FAIL
+
+[text-spacing-trim-wrap-br-001.html?class=chws,vrl]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini b/tests/wpt/meta/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini
new file mode 100644
index 00000000000..17a666f1965
--- /dev/null
+++ b/tests/wpt/meta/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html.ini
@@ -0,0 +1,2 @@
+[scale-and-rotate-both-specified-on-animation-keyframes.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/css/css-transforms/backface-visibility-hidden-animated-002.html.ini b/tests/wpt/meta/css/css-transforms/backface-visibility-hidden-animated-002.html.ini
new file mode 100644
index 00000000000..90198176f4d
--- /dev/null
+++ b/tests/wpt/meta/css/css-transforms/backface-visibility-hidden-animated-002.html.ini
@@ -0,0 +1,2 @@
+[backface-visibility-hidden-animated-002.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html.ini b/tests/wpt/meta/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html.ini
new file mode 100644
index 00000000000..afeea042c86
--- /dev/null
+++ b/tests/wpt/meta/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html.ini
@@ -0,0 +1,2 @@
+[composited-under-rotateY-180deg-preserve-3d.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/field-sizing-computed.html.ini b/tests/wpt/meta/css/css-ui/parsing/field-sizing-computed.html.ini
new file mode 100644
index 00000000000..c7eaf80f035
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/parsing/field-sizing-computed.html.ini
@@ -0,0 +1,6 @@
+[field-sizing-computed.html]
+  [Property field-sizing value 'fixed']
+    expected: FAIL
+
+  [Property field-sizing value 'content']
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/field-sizing-valid.html.ini b/tests/wpt/meta/css/css-ui/parsing/field-sizing-valid.html.ini
new file mode 100644
index 00000000000..7b58b5255f0
--- /dev/null
+++ b/tests/wpt/meta/css/css-ui/parsing/field-sizing-valid.html.ini
@@ -0,0 +1,6 @@
+[field-sizing-valid.html]
+  [e.style['field-sizing'\] = "fixed" should set the property value]
+    expected: FAIL
+
+  [e.style['field-sizing'\] = "content" should set the property value]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini b/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini
deleted file mode 100644
index 25c7ccdbe18..00000000000
--- a/tests/wpt/meta/css/css-ui/parsing/form-sizing-computed.html.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-[form-sizing-computed.html]
-  [Property form-sizing value 'auto']
-    expected: FAIL
-
-  [Property form-sizing value 'normal']
-    expected: FAIL
-
-  [Property form-sizing value 'fixed']
-    expected: FAIL
-
-  [Property form-sizing value 'content']
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini b/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini
deleted file mode 100644
index a31eb2c5cb0..00000000000
--- a/tests/wpt/meta/css/css-ui/parsing/form-sizing-valid.html.ini
+++ /dev/null
@@ -1,12 +0,0 @@
-[form-sizing-valid.html]
-  [e.style['form-sizing'\] = "auto" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "normal" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "fixed" should set the property value]
-    expected: FAIL
-
-  [e.style['form-sizing'\] = "content" should set the property value]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/calc-in-media-queries-with-mixed-units.html.ini b/tests/wpt/meta/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
index 8b30f4fd190..1fdb5b722c8 100644
--- a/tests/wpt/meta/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
+++ b/tests/wpt/meta/css/css-values/calc-in-media-queries-with-mixed-units.html.ini
@@ -1,3 +1,24 @@
 [calc-in-media-queries-with-mixed-units.html]
   [box should be orange if the calc between vw/em in @media was correct]
     expected: FAIL
+
+  [box should be orange if the calc between vw-em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between px/em*em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*em in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*vw/em*px/vh in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vw/px*vh in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vh*vw/em*px in @media was correct]
+    expected: FAIL
+
+  [box should be orange if the calc between vw*vh*px*em/px/px/px in @media was correct]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/calc-serialization-002.html.ini b/tests/wpt/meta/css/css-values/calc-serialization-002.html.ini
new file mode 100644
index 00000000000..e7751de38e0
--- /dev/null
+++ b/tests/wpt/meta/css/css-values/calc-serialization-002.html.ini
@@ -0,0 +1,6 @@
+[calc-serialization-002.html]
+  [testing calc(2 * (min(10px, 20%) + max(1rem, 2%)))]
+    expected: FAIL
+
+  [testing calc((min(10px, 20%) + max(1rem, 2%)) * 2)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-001.html.ini b/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-001.html.ini
index 611a8281050..6fd1c0c8997 100644
--- a/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-001.html.ini
+++ b/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-001.html.ini
@@ -1,3 +1,6 @@
 [getComputedStyle-border-radius-001.html]
   [testing border-radius shorthand]
     expected: FAIL
+
+  [testing border-radius: calc(25% + 10px) calc(25% + 16px) 25% 25px / calc(25% + 20px) calc(25% + 16px) 25% 25px]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-003.html.ini b/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-003.html.ini
index ef2df160556..0b7ccbac4a8 100644
--- a/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-003.html.ini
+++ b/tests/wpt/meta/css/css-values/getComputedStyle-border-radius-003.html.ini
@@ -1,3 +1,6 @@
 [getComputedStyle-border-radius-003.html]
   [testing border-radius shorthand]
     expected: FAIL
+
+  [testing border-radius: calc(1% + 1px) calc(2% + 2px) calc(3% + 3px) calc(4% + 4px) / calc(5% + 5px) calc(6% + 6px) calc(7% + 7px) calc(8% + 8px)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini b/tests/wpt/meta/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini
new file mode 100644
index 00000000000..a1653531ac4
--- /dev/null
+++ b/tests/wpt/meta/css/css-values/getComputedStyle-calc-mixed-units-003.html.ini
@@ -0,0 +1,15 @@
+[getComputedStyle-calc-mixed-units-003.html]
+  [testing width: calc(5px * 10lh / 1px)]
+    expected: FAIL
+
+  [testing width: calc(20% * 0.5em / 1px)]
+    expected: FAIL
+
+  [testing width: calc(4px * 4em / 1px)]
+    expected: FAIL
+
+  [testing width: calc(400px / 4lh * 1px)]
+    expected: FAIL
+
+  [testing width: calc(20% / 0.5em * 1px)]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/cssom-view/checkVisibility.html.ini b/tests/wpt/meta/css/cssom-view/checkVisibility.html.ini
index 489dd4c8c1d..18ed07cad79 100644
--- a/tests/wpt/meta/css/cssom-view/checkVisibility.html.ini
+++ b/tests/wpt/meta/css/cssom-view/checkVisibility.html.ini
@@ -1,4 +1,5 @@
 [checkVisibility.html]
+  expected: ERROR
   [checkVisibility on visibility:hidden element.]
     expected: FAIL
 
diff --git a/tests/wpt/meta/css/selectors/invalidation/has-pseudo-element.html.ini b/tests/wpt/meta/css/selectors/invalidation/has-pseudo-element.html.ini
new file mode 100644
index 00000000000..8a03d029aca
--- /dev/null
+++ b/tests/wpt/meta/css/selectors/invalidation/has-pseudo-element.html.ini
@@ -0,0 +1,2 @@
+[has-pseudo-element.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini b/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini
new file mode 100644
index 00000000000..949cc771645
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html.ini
@@ -0,0 +1,39 @@
+[scoped-registry-define-upgrade-criteria.tentative.html]
+  [Adding definition to global registry should not affect shadow roots using scoped registry]
+    expected: FAIL
+
+  [Adding definition to global registry should affect shadow roots also using global registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry should affect all associated shadow roots]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not affect document tree scope]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not affect shadow roots using other registries]
+    expected: FAIL
+
+  [Adding definition to global registry should not upgrade nodes no longer using the registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes no longer using the registry]
+    expected: FAIL
+
+  [Adding definition to scoped registry affects associated shadow roots in all iframes]
+    expected: FAIL
+
+  [Adding definition to scoped registry affects associated shadow roots in other frame trees]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade disconnected elements]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in constructed documents]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in detached frames]
+    expected: FAIL
+
+  [Adding definition to scoped registry should not upgrade nodes in closed windows]
+    expected: FAIL
diff --git a/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini b/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini
new file mode 100644
index 00000000000..8a6ec8f3e04
--- /dev/null
+++ b/tests/wpt/meta/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html.ini
@@ -0,0 +1,21 @@
+[scoped-registry-define-upgrade-order.tentative.html]
+  [Upgrade in tree order in the same tree scope]
+    expected: FAIL
+
+  [Upgrade in shadow-including tree order across tree scopes]
+    expected: FAIL
+
+  [Upgrade order does not depend on shadow root attach order]
+    expected: FAIL
+
+  [Upgrade in association order across documents, then tree order in each document]
+    expected: FAIL
+
+  [Upgrade order is not affected by DOM order between child frames]
+    expected: FAIL
+
+  [Upgrade order is affected by shadow tree adoption across documents]
+    expected: FAIL
+
+  [Elements in the "owner" window of a scoped registry are not always upgraded first]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/observable/tentative/observable-constructor.window.js.ini b/tests/wpt/meta/dom/observable/tentative/observable-constructor.window.js.ini
new file mode 100644
index 00000000000..394e39cd818
--- /dev/null
+++ b/tests/wpt/meta/dom/observable/tentative/observable-constructor.window.js.ini
@@ -0,0 +1,9 @@
+[observable-constructor.window.html]
+  [No observer handlers can be invoked in detached document]
+    expected: FAIL
+
+  [Subscriber.error() does not "report the exception" even when an `error()` handler is not present, when it is invoked in a detached document]
+    expected: FAIL
+
+  [Cannot subscribe to an Observable in a detached document]
+    expected: FAIL
diff --git a/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini b/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
index c68ae3e8990..31690f3ffdc 100644
--- a/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
+++ b/tests/wpt/meta/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html.ini
@@ -25,3 +25,6 @@
 
   [Basic NodePart parsing]
     expected: FAIL
+
+  [Basic AttributePart cloning with values]
+    expected: FAIL
diff --git a/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini b/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
index a2c563673e2..22fa459058a 100644
--- a/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
+++ b/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js.ini
@@ -2,8 +2,223 @@
   [gb18030 decoder: two bytes 0xFE 0xFF]
     expected: FAIL
 
+  [gb18030 decoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 36]
+    expected: FAIL
+
 
 [gb18030-decoder.any.html]
   [gb18030 decoder: two bytes 0xFE 0xFF]
     expected: FAIL
 
+  [gb18030 decoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 decoder: GB18030-2022 36]
+    expected: FAIL
diff --git a/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini b/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
index eeb3e0ecd46..c0680e67d8b 100644
--- a/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
+++ b/tests/wpt/meta/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html.ini
@@ -650,3 +650,110 @@
   [gb18030 encoder: range 40]
     expected: FAIL
 
+  [gb18030 encoder: GB18030-2022 1]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 2]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 3]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 4]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 5]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 6]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 7]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 8]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 9]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 10]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 11]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 12]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 13]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 14]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 15]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 16]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 17]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 18]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 19]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 20]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 21]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 22]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 23]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 24]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 25]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 26]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 27]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 28]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 29]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 30]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 31]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 32]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 33]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 34]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 35]
+    expected: FAIL
+
+  [gb18030 encoder: GB18030-2022 36]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/api/response/response-consume-stream.any.js.ini b/tests/wpt/meta/fetch/api/response/response-consume-stream.any.js.ini
index 55025b11849..2edc6c1ac56 100644
--- a/tests/wpt/meta/fetch/api/response/response-consume-stream.any.js.ini
+++ b/tests/wpt/meta/fetch/api/response/response-consume-stream.any.js.ini
@@ -23,6 +23,9 @@
   [Read form data response's body as readableStream with mode=byob]
     expected: FAIL
 
+  [Reading with offset from Response stream]
+    expected: FAIL
+
 
 [response-consume-stream.any.worker.html]
   [Getting a redirect Response stream]
@@ -46,6 +49,9 @@
   [Read form data response's body as readableStream with mode=byob]
     expected: FAIL
 
+  [Reading with offset from Response stream]
+    expected: FAIL
+
 
 [response-consume-stream.any.sharedworker.html]
   expected: ERROR
diff --git a/tests/wpt/meta/fetch/fetch-later/activate-after.tentative.https.window.js.ini b/tests/wpt/meta/fetch/fetch-later/activate-after.tentative.https.window.js.ini
new file mode 100644
index 00000000000..e6472de4e04
--- /dev/null
+++ b/tests/wpt/meta/fetch/fetch-later/activate-after.tentative.https.window.js.ini
@@ -0,0 +1,2 @@
+[activate-after.tentative.https.window.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/fetch/fetch-later/basic.tentative.https.window.js.ini b/tests/wpt/meta/fetch/fetch-later/basic.tentative.https.window.js.ini
index c3859cd2643..3fa86d89b2d 100644
--- a/tests/wpt/meta/fetch/fetch-later/basic.tentative.https.window.js.ini
+++ b/tests/wpt/meta/fetch/fetch-later/basic.tentative.https.window.js.ini
@@ -19,3 +19,6 @@
 
   [fetchLater() does not throw error when it is aborted before sending.]
     expected: FAIL
+
+  [fetchLater() throws RangeError on negative activateAfter.]
+    expected: FAIL
diff --git a/tests/wpt/meta/fetch/fetch-later/timeout.tentative.https.window.js.ini b/tests/wpt/meta/fetch/fetch-later/timeout.tentative.https.window.js.ini
deleted file mode 100644
index 2d32eaebde7..00000000000
--- a/tests/wpt/meta/fetch/fetch-later/timeout.tentative.https.window.js.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[timeout.tentative.https.window.html]
-  expected: ERROR
diff --git a/tests/wpt/meta/fetch/metadata/generated/css-images.sub.tentative.html.ini b/tests/wpt/meta/fetch/metadata/generated/css-images.sub.tentative.html.ini
index 4b5c3e26586..8099defc928 100644
--- a/tests/wpt/meta/fetch/metadata/generated/css-images.sub.tentative.html.ini
+++ b/tests/wpt/meta/fetch/metadata/generated/css-images.sub.tentative.html.ini
@@ -185,3 +185,6 @@
 
   [border-image sec-fetch-site - HTTPS downgrade (header not sent)]
     expected: FAIL
+
+  [background-image sec-fetch-mode - Not sent to non-trustworthy same-site destination]
+    expected: TIMEOUT
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 4648085f98d..410ec4c1d39 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
@@ -41,6 +41,3 @@
 
   [sec-fetch-site - HTTPS downgrade-upgrade, no attributes]
     expected: NOTRUN
-
-  [sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/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 574b2fd8927..bf5454c35e1 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
@@ -5,5 +5,8 @@
   [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank?foo']
     expected: FAIL
 
-  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank']
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='']
+    expected: FAIL
+
+  [load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank#foo']
     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-return-value-handling-dynamic.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
index 78240a2f463..f27acdd3b9d 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/javascript-url-return-value-handling-dynamic.html.ini
@@ -4,15 +4,3 @@
 
   [Test javascript URL string return values in direct and indirect (target) frame contexts. 9]
     expected: FAIL
-
-  [0041 set in href="" targeting a frame and clicked]
-    expected: FAIL
-
-  [0080 00FF set in href="" targeting a frame and clicked]
-    expected: FAIL
-
-  [0080 00FF 0100 set in href="" targeting a frame and clicked]
-    expected: FAIL
-
-  [D83D DE0D set in href="" targeting a frame and clicked]
-    expected: FAIL
diff --git a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
index 24d2f8ac554..27889a98fb5 100644
--- a/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
+++ b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigate-to-unparseable-url.html.ini
@@ -1,3 +1,6 @@
 [navigate-to-unparseable-url.html]
   [location.href setter throws a SyntaxError DOMException for unparseable URLs]
     expected: FAIL
+
+  [<a> tag navigate fails for unparseable URLs]
+    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini b/tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
rename to tests/wpt/meta/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.js.ini
diff --git a/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini
new file mode 100644
index 00000000000..96cb0842f0e
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.currentcolor.html]
+  [color-mix works as color input with currentcolor]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
new file mode 100644
index 00000000000..e8df9f60f28
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
new file mode 100644
index 00000000000..2a7000ceb36
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.strokeStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/element/layers/2d.layer.putImageData.html.ini b/tests/wpt/meta/html/canvas/element/layers/2d.layer.putImageData.html.ini
new file mode 100644
index 00000000000..83aac80c2c3
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/element/layers/2d.layer.putImageData.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
new file mode 100644
index 00000000000..e8df9f60f28
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini
new file mode 100644
index 00000000000..697bc254c44
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.fillStyle.colormix.worker.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
new file mode 100644
index 00000000000..2a7000ceb36
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html.ini
@@ -0,0 +1,3 @@
+[2d.strokeStyle.colormix.html]
+  [color-mix works as color input]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini
new file mode 100644
index 00000000000..83aac80c2c3
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini
new file mode 100644
index 00000000000..70715a598da
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.layer.putImageData.worker.html]
+  [Check that calling putImageData in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini
deleted file mode 100644
index fe0c3e0eb4a..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.putImageData.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini
deleted file mode 100644
index 39248753058..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.putImageData.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini
deleted file mode 100644
index 93d97a15ac9..00000000000
--- a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[2d.layer.render-opportunities.transferToImageBitmap.w.html]
-  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini
new file mode 100644
index 00000000000..b0b886aadac
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html.ini
@@ -0,0 +1,3 @@
+[2d.layer.transferToImageBitmap.html]
+  [Check that calling transferToImageBitmap in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini
new file mode 100644
index 00000000000..92236401076
--- /dev/null
+++ b/tests/wpt/meta/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js.ini
@@ -0,0 +1,3 @@
+[2d.layer.transferToImageBitmap.worker.html]
+  [Check that calling transferToImageBitmap in a layer throws an exception.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-assorted.window.js.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-assorted.window.js.ini
index a350126250c..4af5281ea87 100644
--- a/tests/wpt/meta/html/dom/elements/global-attributes/dir-assorted.window.js.ini
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-assorted.window.js.ini
@@ -19,3 +19,6 @@
 
   [Non-HTML element text contents influence dir=auto]
     expected: FAIL
+
+  [text changes apply to dir=auto on further ancestor after removing dir=auto from closer ancestor]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini b/tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
similarity index 65%
rename from tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini
rename to tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
index 32cb19c22c3..2ff8bf31e7e 100644
--- a/tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html.ini
+++ b/tests/wpt/meta/html/dom/elements/global-attributes/dir-slots-directionality.html.ini
@@ -1,4 +1,4 @@
-[dir-slots-directionality.tentative.html]
+[dir-slots-directionality.html]
   [Slots: Directionality: dir=rtl on slot]
     expected: FAIL
 
@@ -16,3 +16,12 @@
 
   [Slots: Directionality: dir=auto on slot with Arabic light tree content]
     expected: FAIL
+
+  [slot provides its directionality (from host) to a dir=auto container]
+    expected: FAIL
+
+  [children with dir attribute are skipped by dir=auto]
+    expected: FAIL
+
+  [slot with dir attribute is skipped by dir=auto]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-001.html.ini b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-001.html.ini
new file mode 100644
index 00000000000..0f8f7196b78
--- /dev/null
+++ b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-001.html.ini
@@ -0,0 +1,2 @@
+[hidden-until-found-001.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-004.html.ini b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-004.html.ini
new file mode 100644
index 00000000000..c2242ec7357
--- /dev/null
+++ b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-004.html.ini
@@ -0,0 +1,2 @@
+[hidden-until-found-004.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-005.html.ini b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-005.html.ini
new file mode 100644
index 00000000000..7c39338f7c4
--- /dev/null
+++ b/tests/wpt/meta/html/editing/the-hidden-attribute/hidden-until-found-005.html.ini
@@ -0,0 +1,2 @@
+[hidden-until-found-005.html]
+  expected: FAIL
diff --git a/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini b/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
new file mode 100644
index 00000000000..d3282074e5f
--- /dev/null
+++ b/tests/wpt/meta/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html.ini
@@ -0,0 +1,4 @@
+[document-base-url-changes-about-srcdoc-2.https.html]
+  expected: TIMEOUT
+  [wrapper promise test for timeout.]
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
index a10be12e8cc..114d6424efc 100644
--- a/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
+++ b/tests/wpt/meta/html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html.ini
@@ -1,7 +1,6 @@
 [document-with-fragment-nonexistent.html]
-  expected: TIMEOUT
   [Autofocus elements in iframed documents with non-existent fragments should work.]
     expected: FAIL
 
   [Autofocus elements in top-level browsing context's documents with non-existent fragments should work.]
-    expected: TIMEOUT
+    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 16db1ea9c58..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: TIMEOUT
+    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: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/form-sizing-input-number.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
similarity index 78%
rename from tests/wpt/meta/html/rendering/widgets/form-sizing-input-number.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
index f2cce1cc1a8..ee1082f2d16 100644
--- a/tests/wpt/meta/html/rendering/widgets/form-sizing-input-number.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-number.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-input-number.tentative.html]
+[field-sizing-input-number.tentative.html]
   [number: Empty value]
     expected: FAIL
 
@@ -14,5 +14,5 @@
   [number: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [number: Update form-sizing property dynamically]
+  [number: Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta/html/rendering/widgets/form-sizing-input-text.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
similarity index 87%
rename from tests/wpt/meta/html/rendering/widgets/form-sizing-input-text.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
index 33eabf960dd..0b2f031b4a5 100644
--- a/tests/wpt/meta/html/rendering/widgets/form-sizing-input-text.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-input-text.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-input-text.tentative.html]
+[field-sizing-input-text.tentative.html]
   [text: Empty value]
     expected: FAIL
 
@@ -17,7 +17,7 @@
   [text: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [text: Update form-sizing property dynamically]
+  [text: Update field-sizing property dynamically]
     expected: FAIL
 
   [search: Empty value]
@@ -38,7 +38,7 @@
   [search: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [search: Update form-sizing property dynamically]
+  [search: Update field-sizing property dynamically]
     expected: FAIL
 
   [tel: Empty value]
@@ -59,7 +59,7 @@
   [tel: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [tel: Update form-sizing property dynamically]
+  [tel: Update field-sizing property dynamically]
     expected: FAIL
 
   [url: Empty value]
@@ -80,7 +80,7 @@
   [url: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [url: Update form-sizing property dynamically]
+  [url: Update field-sizing property dynamically]
     expected: FAIL
 
   [email: Empty value]
@@ -101,7 +101,7 @@
   [email: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [email: Update form-sizing property dynamically]
+  [email: Update field-sizing property dynamically]
     expected: FAIL
 
   [password: Empty value]
@@ -122,5 +122,5 @@
   [password: Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [password: Update form-sizing property dynamically]
+  [password: Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-select.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini
similarity index 63%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-select.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini
index bd921cc4895..035ff8355e0 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-select.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-select.tentative.html.ini
@@ -1,8 +1,8 @@
-[form-sizing-select.tentative.html]
+[field-sizing-select.tentative.html]
   [dropdown: The width should depend on the selected OPTION]
     expected: FAIL
 
-  [dropdown: Change the form-sizing value dynamically]
+  [dropdown: Change the field-sizing value dynamically]
     expected: FAIL
 
   [listbox: The size depend on the content]
@@ -11,5 +11,5 @@
   [listbox: The size attribute value is ignored]
     expected: FAIL
 
-  [listbox: Change the form-sizing value dynamically]
+  [listbox: Change the field-sizing value dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-textarea.tentative.html.ini b/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
similarity index 83%
rename from tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-textarea.tentative.html.ini
rename to tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
index e7397eb411f..f596dfc1538 100644
--- a/tests/wpt/meta-legacy-layout/html/rendering/widgets/form-sizing-textarea.tentative.html.ini
+++ b/tests/wpt/meta/html/rendering/widgets/field-sizing-textarea.tentative.html.ini
@@ -1,4 +1,4 @@
-[form-sizing-textarea.tentative.html]
+[field-sizing-textarea.tentative.html]
   [Empty value]
     expected: FAIL
 
@@ -20,5 +20,5 @@
   [Text caret is shorter than the placeholder]
     expected: FAIL
 
-  [Update form-sizing property dynamically]
+  [Update field-sizing property dynamically]
     expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini
new file mode 100644
index 00000000000..6ed6fe57263
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html.ini
@@ -0,0 +1,3 @@
+[iframe-loading-lazy-base-url-3.html]
+  [When a loading=lazy iframe is changed to eager later before loading, it loads relative to the document's base URL computed at parse-time.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-1.html.ini
index 7d28d586f51..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
@@ -1,3 +1,4 @@
 [iframe_sandbox_popups_escaping-1.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_escaping-2.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
index 26704422bbe..841bafc6eca 100644
--- a/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
+++ b/tests/wpt/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_escaping-2.html.ini
@@ -1,4 +1,3 @@
 [iframe_sandbox_popups_escaping-2.html]
-  expected: TIMEOUT
   [Check that popups from a sandboxed iframe escape the sandbox if\n       allow-popups-to-escape-sandbox is used]
-    expected: TIMEOUT
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini b/tests/wpt/meta/html/semantics/embedded-content/the-img-element/non-active-document.html.ini
index 47b45e65a1c..3cdeb8ebcbc 100644
--- 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
@@ -1,9 +1,3 @@
 [non-active-document.html]
   [DOMParser]
     expected: FAIL
-
-  [createHTMLDocument]
-    expected: FAIL
-
-  [<template>]
-    expected: FAIL
diff --git a/tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini b/tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
similarity index 100%
rename from tests/wpt/meta-legacy-layout/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
rename to tests/wpt/meta/html/semantics/forms/form-submission-0/reparent-form-during-planned-navigation-task.html.ini
diff --git a/tests/wpt/meta/html/semantics/forms/historical.html.ini b/tests/wpt/meta/html/semantics/forms/historical.html.ini
new file mode 100644
index 00000000000..5d8289307cc
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/forms/historical.html.ini
@@ -0,0 +1,3 @@
+[historical.html]
+  [<input name=isindex> should not be supported]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/invokers/idlharness.tentative.html.ini b/tests/wpt/meta/html/semantics/invokers/idlharness.tentative.html.ini
new file mode 100644
index 00000000000..f9d4b78a7c6
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/invokers/idlharness.tentative.html.ini
@@ -0,0 +1,36 @@
+[idlharness.tentative.html]
+  [InvokeEvent interface: existence and properties of interface object]
+    expected: FAIL
+
+  [InvokeEvent interface object length]
+    expected: FAIL
+
+  [InvokeEvent interface object name]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [InvokeEvent interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [InvokeEvent interface: attribute invoker]
+    expected: FAIL
+
+  [InvokeEvent interface: attribute action]
+    expected: FAIL
+
+  [InvokeEvent must be primary interface of new InvokeEvent("invoke")]
+    expected: FAIL
+
+  [Stringification of new InvokeEvent("invoke")]
+    expected: FAIL
+
+  [InvokeEvent interface: new InvokeEvent("invoke") must inherit property "invoker" with the proper type]
+    expected: FAIL
+
+  [InvokeEvent interface: new InvokeEvent("invoke") must inherit property "action" with the proper type]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/invokers/invokeelement-interface.tentative.html.ini b/tests/wpt/meta/html/semantics/invokers/invokeelement-interface.tentative.html.ini
new file mode 100644
index 00000000000..e1534b63047
--- /dev/null
+++ b/tests/wpt/meta/html/semantics/invokers/invokeelement-interface.tentative.html.ini
@@ -0,0 +1,33 @@
+[invokeelement-interface.tentative.html]
+  [invokeTargetElement reflects invokee HTML element]
+    expected: FAIL
+
+  [invokeTargetElement reflects set value]
+    expected: FAIL
+
+  [invokeTargetElement reflects set value across shadow root into light dom]
+    expected: FAIL
+
+  [invokeTargetElement does not reflect set value inside shadowroot]
+    expected: FAIL
+
+  [invokeTargetElement throws error on assignment of non Element]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute not present]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute empty]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute empty 2]
+    expected: FAIL
+
+  [invokeAction reflects tostring value]
+    expected: FAIL
+
+  [invokeAction reflects 'auto' when attribute set to [\]]
+    expected: FAIL
+
+  [invokeAction reflects tostring value 2]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini b/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
index e0d30013daf..7f099cec1b0 100644
--- a/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
+++ b/tests/wpt/meta/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html.ini
@@ -1,5 +1,4 @@
 [htmlanchorelement_noopener.html]
-  expected: TIMEOUT
   [Check that targeting of rel=noopener with a given name reuses an existing window with that name]
     expected: FAIL
 
@@ -8,6 +7,3 @@
 
   [Check that rel=noopener with target=_parent does a normal load]
     expected: FAIL
-
-  [Check that rel=noopener with target=_self does a normal load]
-    expected: NOTRUN
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini
new file mode 100644
index 00000000000..3e5e3765f44
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe-encoding.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini
new file mode 100644
index 00000000000..e7165e1d1ea
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe-style-attribute.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini
new file mode 100644
index 00000000000..3127d2e1e85
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-base-pushstate.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini
new file mode 100644
index 00000000000..b37d72aa3c6
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-base.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini
new file mode 100644
index 00000000000..32d6c23cecd
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html.ini
@@ -0,0 +1,12 @@
+[Document-parseHTMLUnsafe-url-moretests.tentative.html]
+  [Parent window]
+    expected: FAIL
+
+  [Child window]
+    expected: FAIL
+
+  [Child window crossing navigation]
+    expected: FAIL
+
+  [Child window after navigation]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini
new file mode 100644
index 00000000000..fb694d5b88d
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url-pushstate.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini
new file mode 100644
index 00000000000..1ea8ec579dd
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html.ini
@@ -0,0 +1,18 @@
+[Document-parseHTMLUnsafe-url.tentative.html]
+  [valid: created normally]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [valid: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
+
+  [invalid XML: created normally]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from this frame]
+    expected: FAIL
+
+  [invalid XML: created using another iframe's parseHTMLUnsafe from that frame]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini
new file mode 100644
index 00000000000..fc016f8a3bf
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html.ini
@@ -0,0 +1,2 @@
+[Document-parseHTMLUnsafe.tentative.html]
+  expected: ERROR
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini
new file mode 100644
index 00000000000..b2dafdd84b3
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html.ini
@@ -0,0 +1,3 @@
+[Element-setHTMLUnsafe-04.tentative.html]
+  [setHTMLUnsafe should leave the removed children alone.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini
new file mode 100644
index 00000000000..8dd99e73f08
--- /dev/null
+++ b/tests/wpt/meta/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html.ini
@@ -0,0 +1,15 @@
+[setHTMLUnsafe.tentative.html]
+  [Element: setHTMLUnsafe with no shadowdom.]
+    expected: FAIL
+
+  [Element: setHTMLUnsafe with shadowdom.]
+    expected: FAIL
+
+  [ShadowRoot: setHTMLUnsafe with no shadowdom.]
+    expected: FAIL
+
+  [ShadowRoot: setHTMLUnsafe with shadowdom.]
+    expected: FAIL
+
+  [template.setHTMLUnsafe() should modify template content fragment rather than actual children.]
+    expected: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini b/tests/wpt/meta/html/webappapis/scripting/events/compile-event-handler-settings-objects.html.ini
index 6206f8c0210..1053fb90051 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: FAIL
diff --git a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
index 6ab46a7862c..8bcf3a07de4 100644
--- a/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
+++ b/tests/wpt/meta/html/webappapis/scripting/processing-model-2/integration-with-the-javascript-job-queue/promise-job-entry.html.ini
@@ -4,10 +4,10 @@
     expected: FAIL
 
   [Rejection handler on pending-then-rejected promise]
-    expected: FAIL
+    expected: TIMEOUT
 
   [Sanity check: this all works as expected with no promises involved]
-    expected: TIMEOUT
+    expected: FAIL
 
   [Thenable resolution]
     expected: FAIL
@@ -16,4 +16,4 @@
     expected: FAIL
 
   [Fulfillment handler on pending-then-fulfilled promise]
-    expected: FAIL
+    expected: TIMEOUT
diff --git a/tests/wpt/meta/mediasession/setactionhandler.html.ini b/tests/wpt/meta/mediasession/setactionhandler.html.ini
index 85d4c538b49..463ddfe654a 100644
--- a/tests/wpt/meta/mediasession/setactionhandler.html.ini
+++ b/tests/wpt/meta/mediasession/setactionhandler.html.ini
@@ -16,3 +16,6 @@
 
   [Test that setActionHandler("nextslide") succeeds]
     expected: FAIL
+
+  [Test that setActionHandler("enterpictureinpicture") succeeds]
+    expected: FAIL
diff --git a/tests/wpt/meta/quirks/line-height-calculation.html.ini b/tests/wpt/meta/quirks/line-height-calculation.html.ini
index 36593e53e09..1d47608c066 100644
--- a/tests/wpt/meta/quirks/line-height-calculation.html.ini
+++ b/tests/wpt/meta/quirks/line-height-calculation.html.ini
@@ -17,18 +17,6 @@
   [The line height calculation quirk, span { margin:0 1px; padding:1px 0 }<div id=test><span></span></div><div id=ref></div><div id=s_ref>x</div>]
     expected: FAIL
 
-  [The line height calculation quirk, span { border-right:1px solid }<div id=test><span></span></div><div id=ref>x</div><div id=s_ref>x</div>]
-    expected: FAIL
-
-  [The line height calculation quirk, span { border-left:1px solid }<div id=test><span></span></div><div id=ref>x</div><div id=s_ref>x</div>]
-    expected: FAIL
-
-  [The line height calculation quirk, span { padding-right:1px }<div id=test><span></span></div><div id=ref>x</div><div id=s_ref>x</div>]
-    expected: FAIL
-
-  [The line height calculation quirk, span { padding-left:1px }<div id=test><span></span></div><div id=ref>x</div><div id=s_ref>x</div>]
-    expected: FAIL
-
   [The line height calculation quirk, span { display:inline-block; height:1px }<div id=test><i><span></span> </i></div><span id=ref></span><div id=s_ref>x</div>]
     expected: FAIL
 
@@ -41,8 +29,5 @@
   [The line height calculation quirk, iframe { height:1px }<div id=test><iframe></iframe></div><img id=ref src="{png}" height=5><div id=s_ref>x</div>]
     expected: FAIL
 
-  [The line height calculation quirk, #test::before { content:"" } #test::before, span { border:solid }<div id=test></div><div id=ref><span>x</span></div><div id=s_ref><span>x</span></div>]
-    expected: FAIL
-
   [The line height calculation quirk, div { line-height: 0;} span { margin:0 1px; line-height: normal; }<div id=test>x<span></span></div><div id=ref>x</div><div id=s_ref>x<span>x</span></div>]
     expected: FAIL
diff --git a/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini
new file mode 100644
index 00000000000..515a82f8cae
--- /dev/null
+++ b/tests/wpt/meta/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js.ini
@@ -0,0 +1,3 @@
+[audioworklet-registerprocessor-constructor.https.window.html]
+  [Verifies two TypeError cases from registerProcessor() method.]
+    expected: FAIL
diff --git a/tests/wpt/meta/webmessaging/with-ports/017.html.ini b/tests/wpt/meta/webmessaging/with-ports/017.html.ini
new file mode 100644
index 00000000000..c7946fc91b4
--- /dev/null
+++ b/tests/wpt/meta/webmessaging/with-ports/017.html.ini
@@ -0,0 +1,4 @@
+[017.html]
+  expected: TIMEOUT
+  [origin of the script that invoked the method, about:blank]
+    expected: TIMEOUT
diff --git a/tests/wpt/tests/.taskcluster.yml b/tests/wpt/tests/.taskcluster.yml
index c817999b8e6..2b7c06fa93a 100644
--- a/tests/wpt/tests/.taskcluster.yml
+++ b/tests/wpt/tests/.taskcluster.yml
@@ -57,7 +57,7 @@ tasks:
             owner: ${owner}
             source: ${event.repository.clone_url}
           payload:
-            image: webplatformtests/wpt:0.54
+            image: webplatformtests/wpt:0.55
             maxRunTime: 7200
             artifacts:
               public/results:
diff --git a/tests/wpt/tests/accname/name/comp_name_from_content.html b/tests/wpt/tests/accname/name/comp_name_from_content.html
index 0b40206a7eb..41cd3506ce2 100644
--- a/tests/wpt/tests/accname/name/comp_name_from_content.html
+++ b/tests/wpt/tests/accname/name/comp_name_from_content.html
@@ -2,35 +2,251 @@
 <html>
 <head>
   <title>Name Comp: Name From Content</title>
+  <meta charset="utf-8">
   <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>
+  <style type="text/css">
+
+     /*
+
+      Since the AccName spec is in flux about whitespace joiners, and the implementations don't match,
+      normalize the whitespace (with extra leading/trailing) space.
+
+      No point in having the same in-flux spec change cause failures the remaining unrelated tests.
+
+      See more here:
+      https://github.com/w3c/accname/issues/205
+      https://github.com/w3c/accname/projects/1#card-42288231
+
+    */
+
+    .simple-before::before {
+      content: " before "; /* [sic] leading and trailing space */
+      margin:0 0.1em;
+    }
+    .simple-after::after {
+      content: " after "; /* [sic] leading and trailing space */
+      margin:0 0.1em;
+    }
+    .no-space::before, .no-space::after {
+      content: "nospace"; /* [sic] Unlike the others, NO extra leading/trailing space here. */
+    }
+    .simple-before:dir(rtl)::before {
+      content: " من قبل "; /* [sic] leading and trailing space */
+    }
+    .simple-after:dir(rtl)::after {
+      content: " بعد "; /* [sic] leading and trailing space */
+    }
+    .fallback-before::before {
+      content: " before "; /* [sic] leading and trailing space */
+      content: " before " / " alt-before "; /* Override the previous line for engines that support the Alternative Text syntax. */
+    }
+    .fallback-after::after {
+      content: " after "; /* [sic] leading and trailing space */
+      content: " after " / " alt-after "; /* Override the previous line for engines that support the Alternative Text syntax. */
+    }
+    .block > span {
+      display: block;
+      margin: 0 0.1em;
+    }
+    .iblock > span {
+      display: inline-block;
+      margin: 0 0.1em;
+    }
+
+  </style>
 </head>
 <body>
 
 <p>Tests the <a href="https://w3c.github.io/accname/#comp_name_from_content">#comp_name_from_content</a> portions of the AccName <em>Name Computation</em> algorithm.</p>
 
-<h1 data-expectedlabel="label" data-testname="heading name from content" class="ex">label</h1>
+<p>This series of tests exercises the button, heading, and link elements, because each have different characteristics worthy of testing in each of the name computation algorithm scenarios:</p>
+<ul>
+  <li>button is a leaf node with sub-level elements presentational.</li>
+  <li>heading is block level, and can contain sub-level interactives like links.</li>
+  <li>link (a[href]) is an interactive inline element that can include non-presentational descendants.</li>
+</ul>
 
-<!--
+<h1>ARIA roles, inline</h1>
+<span tabindex="0" role="button" data-expectedlabel="label" data-testname="aria button name from content, inline" class="ex">label</span><br>
+<span tabindex="0" role="heading" data-expectedlabel="label" data-testname="aria heading name from content, inline" class="ex">label</span><br>
+<span tabindex="0" role="link" data-expectedlabel="label" data-testname="aria link name from content, inline" class="ex">label</span><br>
+<br>
 
-Todo: test all remaining cases of https://w3c.github.io/accname/#comp_name_from_content
-  - comp_name_from_content_reset
-  - comp_name_from_content_pseudo_element
-  - comp_name_from_content_pseudo_element_before
-  - comp_name_from_content_pseudo_element_after
-  - comp_name_from_content_for_each_child
-  - comp_name_from_content_for_each_child_set_current
-  - comp_name_from_content_for_each_child_recursion
-  - comp_for_each_child_append
-  - comp_name_from_content_return
+<h1>ARIA roles, block</h1>
+<div tabindex="0" role="button" data-expectedlabel="label" data-testname="aria button name from content, block" class="ex">label</div>
+<div tabindex="0" role="heading" data-expectedlabel="label" data-testname="aria heading name from content, block" class="ex">label</div>
+<div tabindex="0" role="link" data-expectedlabel="label" data-testname="aria link name from content, block" class="ex">label</div>
+<br>
 
-Todo: test all remaining *recursive* cases in https://w3c.github.io/accname/#comp_recursive_name_from_content
+<h1>simple</h1>
+<button data-expectedlabel="label" data-testname="button name from content" class="ex">label</button><br>
+<h3 data-expectedlabel="label" data-testname="heading name from content" class="ex">label</h3>
+<a href="#" data-expectedlabel="label" data-testname="link name from content" class="ex">label</a><br>
+<br>
 
--->
+<h1>simple with ::before</h1>
+<button data-expectedlabel="before label" data-testname="button name from content with ::before" class="ex simple-before">label</button><br>
+<h3 data-expectedlabel="before label" data-testname="heading name from content with ::before" class="ex simple-before">label</h3>
+<a href="#" data-expectedlabel="before label" data-testname="link name from content with ::before" class="ex simple-before">label</a><br>
+<br>
+
+<h1>simple with ::after</h1>
+<button data-expectedlabel="label after" data-testname="button name from content with ::after" class="ex simple-after">label</button><br>
+<h3 data-expectedlabel="label after" data-testname="heading name from content with ::after" class="ex simple-after">label</h3>
+<a href="#" data-expectedlabel="label after" data-testname="link name from content with ::after" class="ex simple-after">label</a><br>
+<br>
+
+<h1>simple with ::before and ::after</h1>
+<button data-expectedlabel="before label after" data-testname="button name from content with ::before and ::after" class="ex simple-before simple-after">label</button><br>
+<h3 data-expectedlabel="before label after" data-testname="heading name from content with ::before and ::after" class="ex simple-before simple-after">label</h3>
+<a href="#" data-expectedlabel="before label after" data-testname="link name from content with ::before and ::after" class="ex simple-before simple-after">label</a><br>
+<br>
+
+<h1>no space joiners ::before and ::after</h1>
+<button data-expectedlabel="nospacelabelnospace" data-testname="button name from content no space joiners ::before and ::after" class="ex no-space">label</button><br>
+<h3 data-expectedlabel="nospacelabelnospace" data-testname="heading name from content no space joiners ::before and ::after" class="ex no-space">label</h3>
+<a href="#" data-expectedlabel="nospacelabelnospace" data-testname="link name from content no space joiners ::before and ::after" class="ex no-space">label</a><br>
+<br>
+
+<h1>Arabic right-to-left (RTL) with ::before and ::after</h1>
+<div dir="rtl" lang="ar">
+  <button data-expectedlabel="من قبل اسم بعد" data-testname="button name from content with ::before and ::after in rtl" class="ex simple-before simple-after">اسم</button><br>
+  <h3 data-expectedlabel="من قبل اسم بعد" data-testname="heading name from content with ::before and ::after in rtl" class="ex simple-before simple-after">اسم</h3>
+  <a href="#" data-expectedlabel="من قبل اسم بعد" data-testname="link name from content with ::before and ::after in rtl" class="ex simple-before simple-after">اسم</a><br>
+</div>
+<br>
+
+<h1><a href="https://drafts.csswg.org/css-content/#alt">Alternative Text for  CSS content (previously `alt:`)</a> in pseudo-elements</h1>
+<p>rendered text should be "before label after"</p>
+<p>accessibility label should be "alt-before label alt-after"</p>
+<button data-expectedlabel="alt-before label alt-after" data-testname="button name from fallback content with ::before and ::after" class="ex fallback-before fallback-after">label</button><br>
+<h3 data-expectedlabel="alt-before label alt-after" data-testname="heading name from fallback content with ::before and ::after" class="ex fallback-before fallback-after">label</h3>
+<a href="#" data-expectedlabel="alt-before label alt-after" data-testname="link name from fallback content with ::before and ::after" class="ex fallback-before fallback-after">label</a><br>
+<br>
+
+<h1>simple w/ for each child</h1>
+<button data-expectedlabel="one two three" data-testname="button name from content for each child" class="ex"><span>one</span> <span>two</span> <span>three</span></button><br>
+<h3 data-expectedlabel="one two three" data-testname="heading name from content for each child" class="ex"><span>one</span> <span>two</span> <span>three</span></h3>
+<a href="#" data-expectedlabel="one two three" data-testname="link name from content for each child" class="ex"><span>one</span> <span>two</span> <span>three</span></a><br>
+<br>
+
+<h1>simple for each child with image</h1>
+<button data-expectedlabel="one two three" data-testname="button name from content for each child including image" class="ex"><span>one</span> <img src="#" alt="two"> <span>three</span></button><br>
+<h3 data-expectedlabel="one two three" data-testname="heading name from content for each child including image" class="ex"><span>one</span> <img src="#" alt="two"> <span>three</span></h3>
+<a href="#" data-expectedlabel="one two three" data-testname="link name from content for each child including image" class="ex"><span>one</span> <img src="#" alt="two"> <span>three</span></a><br>
+<br>
+
+
+<h1>simple for each child with extra nesting containing image</h1>
+<button data-expectedlabel="one two three four" data-testname="button name from content for each child including nested image" class="ex"><span>one</span> <span>two <img src="#" alt="three"></span> <span>four</span></button><br>
+<h3 data-expectedlabel="one two three four" data-testname="heading name from content for each child including nested image" class="ex"><span>one</span> <span>two <img src="#" alt="three"></span> <span>four</span></h3>
+<a href="#" data-expectedlabel="one two three four" data-testname="link name from content for each child including nested image" class="ex"><span>one</span> <span>two <img src="#" alt="three"></span> <span>four</span></a><br>
+<br>
+
+<h1>heading with nested button with nested image</h1>
+<h3 data-expectedlabel="heading button image button heading" data-testname="heading name from content for each child including nested button with nested image" class="ex">
+  heading
+  <button>
+    button
+    <img src="#" alt="image">
+    button
+  </button>
+  heading
+</h3>
+
+<h1>heading with nested link with nested image</h1>
+<h3 data-expectedlabel="heading link image link heading" data-testname="heading name from content for each child including nested link with nested image" class="ex">
+  heading
+  <a href="#">
+    link
+    <img src="#" alt="image">
+    link
+  </a>
+  heading
+</h3>
+
+<h1>heading with nested link with nested image using aria-label</h1>
+<h3 data-expectedlabel="heading link aria-label heading" data-testname="heading name from content for each child including nested link using aria-label with nested image" class="ex">
+  heading
+  <a href="#" aria-label="link aria-label"><!-- should skip the other link text -->
+    ignored link text
+    <img id="nested_image_label_1" src="#" alt="ignored image alt">
+    ignored link text
+  </a>
+  heading
+</h3>
+
+<h1>heading with nested link with nested image using aria-labelledby</h1>
+<h3 data-expectedlabel="heading image heading" data-testname="heading name from content for each child including nested link using aria-labelledby with nested image" class="ex">
+  heading
+  <a href="#" aria-labelledby="nested_image_label1"><!-- should skip the other link text -->
+    ignored link text
+    <img id="nested_image_label1" src="#" alt="image">
+    ignored link text
+  </a>
+  heading
+</h3>
+
+<h1>heading with two nested links referencing image using aria-labelledby</h1>
+<h3 data-expectedlabel="image link2 link3" data-testname="heading name from content for each child including two nested links using aria-labelledby with nested image" class="ex">
+  <a href="#" aria-labelledby="nested_image_label2">
+    link1<!-- this text is skipped because of aria-labelledby -->
+  </a>
+  <a href="#" data-expectedlabel="link2 image link3" data-testname="link name from content for each child including nested image (referenced elsewhere via labelledby)" class="ex">
+    link2
+    <img id="nested_image_label2" src="#" alt="image">
+    <!-- image skipped in this link (when computing heading text) because it was already referenced by the first link within this heading label recursion cycle. -->
+    <!-- but image not skipped when computing the text of the link itself since it has not been referenced in that context -->
+    link3
+  </a>
+</h3>
+
+<!-- cross-referencial edge case-->
+<h1>heading with link referencing image using aria-labelledby, that in turn references text element via aria-labelledby</h1>
+<h3 data-expectedlabel="image link" data-testname="heading with link referencing image using aria-labelledby, that in turn references text element via aria-labelledby" class="ex">
+  <a href="#" aria-labelledby="nested_image_label3">
+    <span class="note" id="crossref_link">link</span><!-- this text is skipped the first time around because of aria-labelledby on parent element -->
+  </a>
+  <!-- but it's picked up again in inverse order b/c of cross-referencial aria-labelledby edge case -->
+  <img id="nested_image_label_3" src="#" alt="image" aria-labelledby="crossref_link">
+</h3>
+
+<!-- self-referencial edge case-->
+<h1>heading with link referencing image using aria-labelledby, that in turn references itself and another element via aria-labelledby</h1>
+<h3 data-expectedlabel="image link" data-testname="heading with link referencing image using aria-labelledby, that in turn references itself and another element via aria-labelledby" class="ex">
+  <a href="#" aria-labelledby="nested_image_label4">
+    <span class="note" id="crossref_link2">link</span><!-- this text is skipped the first time around because of aria-labelledby on parent element -->
+  </a>
+  <!-- but it's picked up again (after the self-referencial image alt) in inverse order b/c of cross-referencial aria-labelledby edge case -->
+  <img id="nested_image_label4" src="#" alt="image" aria-labelledby="nested_image_label4 crossref_link2">
+</h3>
+
+
+<!-- Note: The following test is out of line with the spec, but matching two out of three implementations at the time of writing, and spec changes are expeected. -->
+<!-- See details in https://github.com/w3c/accname/issues/205 -->
+<!-- Final spec resolution will be addressed in AccName Whitespace Project: https://github.com/w3c/accname/projects/1#card-42288231 -->
+<h1>simple w/ for each child (w/o spaces and display:inline)</h1>
+<button data-expectedlabel="onetwothree" data-testname="button name from content for each child (no space, inline)" class="ex"><span>one</span><span>two</span><span>three</span></button><br>
+<h3 data-expectedlabel="onetwothree" data-testname="heading name from content for each child (no space, inline)" class="ex"><span>one</span><span>two</span><span>three</span></h3>
+<a href="#" data-expectedlabel="onetwothree" data-testname="link name from content for each child (no space, inline)" class="ex"><span>one</span><span>two</span><span>three</span></a><br>
+<br>
+
+<h1>simple w/ for each child (w/o spaces and display:block)</h1>
+<button data-expectedlabel="one two three" data-testname="button name from content for each child (no space, display:block)" class="ex block"><span>one</span><span>two</span><span>three</span></button><br>
+<h3 data-expectedlabel="one two three" data-testname="heading name from content for each child (no space, display:block)" class="ex block"><span>one</span><span>two</span><span>three</span></h3>
+<a href="#" data-expectedlabel="one two three" data-testname="link name from content for each child (no space, display:block)" class="ex block"><span>one</span><span>two</span><span>three</span></a><br>
+<br>
+
+<h1>simple w/ for each child (w/o spaces and display:inline block)</h1>
+<button data-expectedlabel="one two three" data-testname="button name from content for each child (no space, display:inline-block)" class="ex iblock"><span>one</span><span>two</span><span>three</span></button><br>
+<h3 data-expectedlabel="one two three" data-testname="heading name from content for each child (no space, display:inline-block)" class="ex iblock"><span>one</span><span>two</span><span>three</span></h3>
+<a href="#" data-expectedlabel="one two three" data-testname="link name from content for each child (no space, display:inline-block)" class="ex iblock"><span>one</span><span>two</span><span>three</span></a><br>
+<br>
 
 <script>
 AriaUtils.verifyLabelsBySelector(".ex");
diff --git a/tests/wpt/tests/accname/name/comp_tooltip.html b/tests/wpt/tests/accname/name/comp_tooltip.html
index 34718bd025f..bcb17d3418a 100644
--- a/tests/wpt/tests/accname/name/comp_tooltip.html
+++ b/tests/wpt/tests/accname/name/comp_tooltip.html
@@ -11,11 +11,39 @@
 </head>
 <body>
 
-  <p>Tests the <a href="https://w3c.github.io/accname/#comp_tooltip">#comp_tooltip</a> portions of the AccName <em>Name Computation</em> algorithm.</p>
+<p>Tests the <a href="https://w3c.github.io/accname/#comp_tooltip">#comp_tooltip</a> portions of the AccName <em>Name Computation</em> algorithm.</p>
 
-<a href="#" title="label" data-expectedlabel="label" data-testname="link label from tooltip" class="ex"><img src="#" alt=""></a>
+<a href="#" title="label" data-expectedlabel="label" data-testname="link with img with tooltip label" class="ex"><img src="#" alt=""></a>
+<a href="#" title="label" data-expectedlabel="label" data-testname="link with text with tooltip label" class="ex">content</a>
+<div title="label" role="group" data-expectedlabel="label" data-testname="div with text with tooltip label" class="ex">content</div>
+<img src="foo.jpg" title="label" data-expectedlabel="label" data-testname="img with tooltip label without alt" class="ex">
+<img src="foo.jpg" title="label" data-expectedlabel="label" alt="" data-testname="img with tooltip label with empty alt" class="ex">
+<img src="foo.jpg" title="label" data-expectedlabel="broken" alt="broken" data-testname="img with tooltip label with alt" class="ex">
+<img src="foo.jpg" data-expectedlabel="broken" alt="broken" data-testname="img with tooltip label without title" class="ex">
 
-<!-- Todo: test all remaining cases of https://w3c.github.io/accname/#comp_tooltip -->
+<textarea title="enter text" data-expectedlabel="enter text" placeholder="textarea" data-testname="textarea with placeholder and tooltip label" class="ex"></textarea>
+<input type="text" title="label" data-expectedlabel="label" placeholder="text" data-testname="text input with placeholder and tooltip label" class="ex">
+<input type="email" title="label" data-expectedlabel="label" placeholder="email" data-testname="email input with placeholder and tooltip label" class="ex">
+<input type="password" title="label" data-expectedlabel="label" placeholder="password" data-testname="password input with placeholder and tooltip label" class="ex">
+<input type="checkbox" title="label" data-expectedlabel="label" data-testname="checkbox input with tooltip label" class="ex">
+<input type="radio" title="label" data-expectedlabel="label" data-testname="radio input with tooltip label" class="ex">
+<button title="label" data-expectedlabel="label" data-testname="button with tooltip label" class="ex">button</button>
+<abbr title="Web Platform Tests" data-expectedlabel="Web Platform Tests" data-testname="abbr with tooltip label" class="ex">WPT</abbr>
+<kbd title="Control + Option" data-expectedlabel="Control + Option" data-testname="kbd with tooltip label" class="ex">CTRL + OPT</kbd>
+
+<select title="label" data-expectedlabel="label" data-testname="select with tooltip label" class="ex">
+  <option value="" disabled selected>select options</option>
+  <option value="1">option 1</option>
+  <option value="2">option 2</option>
+  <option value="3">option 3</option>
+</select>
+
+<details>
+  <summary title="label" data-expectedlabel="label" data-testname="summary with tooltip label" class="ex">summary</summary>
+  details
+</details>
+
+<iframe title="label" data-expectedlabel="label" data-testname="iframe with tooltip label" width="20px" height="20px" class="ex"></iframe>
 
 <script>
 AriaUtils.verifyLabelsBySelector(".ex");
diff --git a/tests/wpt/tests/common/security-features/subresource/video.py b/tests/wpt/tests/common/security-features/subresource/video.py
index 7cfbbfa68c8..9db8e9fbb5a 100644
--- a/tests/wpt/tests/common/security-features/subresource/video.py
+++ b/tests/wpt/tests/common/security-features/subresource/video.py
@@ -4,7 +4,7 @@ import importlib
 subresource = importlib.import_module("common.security-features.subresource.subresource")
 
 def generate_payload(request, server_data):
-    file = os.path.join(request.doc_root, u"media", u"movie_5.ogv")
+    file = os.path.join(request.doc_root, u"media", u"movie_5.webm")
     return open(file, "rb").read()
 
 
@@ -14,4 +14,4 @@ def main(request, response):
                         response,
                         payload_generator = handler,
                         access_control_allow_origin = b"*",
-                        content_type = b"video/ogg")
+                        content_type = b"video/webm")
diff --git a/tests/wpt/tests/content-security-policy/embedded-enforcement/allow_csp_from-header.html b/tests/wpt/tests/content-security-policy/embedded-enforcement/allow_csp_from-header.html
index b2abcbece0e..ffef7d778fe 100644
--- a/tests/wpt/tests/content-security-policy/embedded-enforcement/allow_csp_from-header.html
+++ b/tests/wpt/tests/content-security-policy/embedded-enforcement/allow_csp_from-header.html
@@ -9,29 +9,29 @@
 <body>
   <script>
     var tests = [
-      { "name": "Same origin iframes are always allowed.",
+      { "name": "Same origin iframes with correct Allow-CSP-From header are allowed.",
         "origin": Host.SAME_ORIGIN,
         "csp": "style-src 'unsafe-inline'; script-src 'unsafe-inline'",
-        "allow_csp_from": "¢¥§",
+        "allow_csp_from": getOrigin(),
         "expected": IframeLoad.EXPECT_LOAD,
         "blockedURI": null},
-      { "name": "Same origin iframes are allowed even if the Allow-CSP-From is empty.",
+      { "name": "Same origin iframes with an empty Allow-CSP-From header get blocked.",
         "origin": Host.SAME_ORIGIN,
         "csp": "style-src 'unsafe-inline'; script-src 'unsafe-inline'",
         "allow_csp_from": "",
-        "expected": IframeLoad.EXPECT_LOAD,
+        "expected": IframeLoad.EXPECT_BLOCK,
         "blockedURI": null},
-      { "name": "Same origin iframes are allowed even if the Allow-CSP-From is not present.",
+      { "name": "Same origin iframes without Allow-CSP-From header gets blocked.",
         "origin": Host.SAME_ORIGIN,
         "csp": "style-src 'unsafe-inline'; script-src 'unsafe-inline'",
         "allow_csp_from": null,
-        "expected": IframeLoad.EXPECT_LOAD,
+        "expected": IframeLoad.EXPECT_BLOCK,
         "blockedURI": null},
-      { "name": "Same origin iframes are allowed even if Allow-CSP-From does not match origin.",
+      { "name": "Same origin iframes are blocked if Allow-CSP-From does not match origin.",
         "origin": Host.SAME_ORIGIN,
         "csp": "style-src 'unsafe-inline'; script-src 'unsafe-inline'",
         "allow_csp_from": "http://example.com:888",
-        "expected": IframeLoad.EXPECT_LOAD,
+        "expected": IframeLoad.EXPECT_BLOCK,
         "blockedURI": null},
       { "name": "Cross origin iframe with an empty Allow-CSP-From header gets blocked.",
         "origin": Host.CROSS_ORIGIN,
diff --git a/tests/wpt/tests/content-security-policy/embedded-enforcement/support/embed-img-and-message-top.html.headers b/tests/wpt/tests/content-security-policy/embedded-enforcement/support/embed-img-and-message-top.html.headers
new file mode 100644
index 00000000000..eb2fe688ecd
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/embedded-enforcement/support/embed-img-and-message-top.html.headers
@@ -0,0 +1 @@
+Allow-CSP-From: *
diff --git a/tests/wpt/tests/content-security-policy/frame-src/frame-src-cross-origin-load.sub.html b/tests/wpt/tests/content-security-policy/frame-src/frame-src-cross-origin-load.sub.html
index 956c79fbf0a..d5a0d4bbbec 100644
--- a/tests/wpt/tests/content-security-policy/frame-src/frame-src-cross-origin-load.sub.html
+++ b/tests/wpt/tests/content-security-policy/frame-src/frame-src-cross-origin-load.sub.html
@@ -1,68 +1,48 @@
 <!DOCTYPE html>
 <html>
-
 <head>
-    <!-- Programmatically converted from a WebKit Reftest, please forgive resulting idiosyncracies.-->
-    <meta http-equiv="Content-Security-Policy" content="frame-src 'self' http://www1.{{host}}:{{ports[http][0]}}; script-src 'self' 'unsafe-inline'; connect-src 'self';">
+    <!-- Only allow same-origin frames, and frames from https://{{hosts[][www1]}}:{{ports[https][0]}} -->
+    <meta http-equiv="Content-Security-Policy" content="frame-src 'self' https://{{hosts[][www1]}}:{{ports[https][0]}};">
     <title>frame-src-cross-origin-load</title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src='../support/logTest.sub.js?logs=["PASS IFrame %231 generated a load event.","PASS IFrame %232 generated a load event.","PASS IFrame %233 generated a load event.","violated-directive=frame-src"]'></script>
-    <script>
-        window.addEventListener('securitypolicyviolation', function(e) {
-            log("violated-directive=" + e.violatedDirective);
-        });
-
-        window.addEventListener("message", function(event) {
-            alert_assert(event.data);
-        }, false);
-
-        var t_alert = async_test('Expecting alerts: ["PASS","PASS"]');
-        var expected_alerts = ["PASS", "PASS"];
-
-        function alert_assert(msg) {
-            t_alert.step(function() {
-                if (msg.match(/^FAIL/i)) {
-                    assert_unreached(msg);
-                    t_alert.done();
-                }
-                for (var i = 0; i < expected_alerts.length; i++) {
-                    if (expected_alerts[i] == msg) {
-                        assert_equals(expected_alerts[i], msg);
-                        expected_alerts.splice(i, 1);
-                        if (expected_alerts.length == 0) {
-                            t_alert.done();
-                        }
-                        return;
-                    }
-                }
-                assert_unreached('unexpected alert: ' + msg);
-                t_alert.done();
-            });
-        }
-
-    </script>
-
+</head>
+<body>
     <p>
-        IFrames blocked by CSP should generate a 'load', not 'error' event, regardless of blocked state. This means they appear to be normal cross-origin loads, thereby not leaking URL information directly to JS.
+        IFrames blocked by CSP should generate a 'load', not 'error' event, regardless of blocked
+        state. This means they appear to be normal cross-origin loads, thereby not leaking URL
+        information directly to JS.
     </p>
     <script>
-        window.wasPostTestScriptParsed = true;
-        var loads = 0;
+      promise_test(async t => {
+        return new Promise((resolve, reject) => {
+          let f = document.createElement('iframe');
+          f.src = "../support/postmessage-pass.html";
+          f.onload = resolve;
+          f.onerror = reject;
+          document.body.appendChild(f);
+        }, "Same-origin allowed frame fires a `load` event.");
+      });
 
-        function loadEvent() {
-            loads++;
-            log("PASS " + "IFrame #" + loads + " generated a load event.");
-        }
+      promise_test(async t => {
+        return new Promise((resolve, reject) => {
+          let f = document.createElement('iframe');
+          f.src = "https://{{hosts[][www1]}}:{{ports[https][0]}}/content-security-policy/support/postmessage-pass.html";
+          f.onload = resolve;
+          f.onerror = reject;
+          document.body.appendChild(f);
+        }, "Cross-origin allowed frame fires a `load` event.");
+      });
 
+      promise_test(async t => {
+        return new Promise((resolve, reject) => {
+          let f = document.createElement('iframe');
+          f.src = "https://{{hosts[alt][]}}:{{ports[https][0]}}/content-security-policy/support/postmessage-fail.html";
+          f.onload = resolve;
+          f.onerror = reject;
+          document.body.appendChild(f);
+        }, "Cross-origin blocked frame fires a `load` event.");
+      });
     </script>
-</head>
-
-<body>
-    <iframe src="../support/postmessage-pass.html" onload="loadEvent()"></iframe>
-    <iframe src="http://www1.{{host}}:{{ports[http][0]}}/content-security-policy/support/postmessage-pass.html" onload="loadEvent()"></iframe>
-    <iframe src="http://www2.{{host}}:{{ports[http][0]}}/content-security-policy/support/postmessage-fail.html" onload="loadEvent()" onerror="log('FAIL')"></iframe>
-    <div id="log"></div>
-</body>
-
+  </body>
 </html>
diff --git a/tests/wpt/tests/content-security-policy/inheritance/support/message-top-and-navigate-back.html.headers b/tests/wpt/tests/content-security-policy/inheritance/support/message-top-and-navigate-back.html.headers
new file mode 100644
index 00000000000..eb2fe688ecd
--- /dev/null
+++ b/tests/wpt/tests/content-security-policy/inheritance/support/message-top-and-navigate-back.html.headers
@@ -0,0 +1 @@
+Allow-CSP-From: *
diff --git a/tests/wpt/tests/core-aam/aria-haspopup_true-manual.html b/tests/wpt/tests/core-aam/aria-haspopup_true-manual.html
index 659e77cc984..21795bfe322 100644
--- a/tests/wpt/tests/core-aam/aria-haspopup_true-manual.html
+++ b/tests/wpt/tests/core-aam/aria-haspopup_true-manual.html
@@ -27,7 +27,7 @@
                   "property",
                   "objectAttributes",
                   "contains",
-                  "haspopup:true"
+                  "haspopup:menu"
                ]
             ],
             "AXAPI" : [
@@ -55,7 +55,7 @@
                   "property",
                   "objectAttributes",
                   "contains",
-                  "haspopup:true"
+                  "haspopup:menu"
                ]
             ],
             "MSAA" : [
diff --git a/tests/wpt/tests/credential-management/fedcm-account-auto-selected-flag.https.html b/tests/wpt/tests/credential-management/fedcm-auto-selected-flag.https.html
similarity index 67%
rename from tests/wpt/tests/credential-management/fedcm-account-auto-selected-flag.https.html
rename to tests/wpt/tests/credential-management/fedcm-auto-selected-flag.https.html
index ac3515596ae..d06aba73bc1 100644
--- a/tests/wpt/tests/credential-management/fedcm-account-auto-selected-flag.https.html
+++ b/tests/wpt/tests/credential-management/fedcm-auto-selected-flag.https.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<title>Federated Credential Management API account auto selected flag tests.</title>
+<title>Federated Credential Management API auto selected flag tests.</title>
 <link rel="help" href="https://fedidcg.github.io/FedCM">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
@@ -13,17 +13,17 @@ import {request_options_with_mediation_optional,
         fedcm_get_and_select_first_account} from './support/fedcm-helper.sub.js';
 
 fedcm_test(async t => {
-  let test_options = request_options_with_mediation_optional("manifest_with_account_auto_selected_flag.json");
+  let test_options = request_options_with_mediation_optional("manifest_with_auto_selected_flag.json");
   await select_manifest(t, test_options);
 
   let cred = await fedcm_get_and_select_first_account(t, test_options);
-  assert_equals(cred.token, "is_account_auto_selected=false");
+  assert_equals(cred.token, "is_auto_selected=false");
 
-  test_options = request_options_with_mediation_optional("manifest_with_account_auto_selected_flag.json");
+  test_options = request_options_with_mediation_optional("manifest_with_auto_selected_flag.json");
   await select_manifest(t, test_options);
 
   cred = await navigator.credentials.get(test_options);
-  assert_equals(cred.token, "is_account_auto_selected=true");
-  assert_equals(cred.isAccountAutoSelected, true);
-}, "Test that the is_account_auto_selected bit is properly sent.");
+  assert_equals(cred.token, "is_auto_selected=true");
+  assert_equals(cred.isAutoSelected, true);
+}, "Test that the is_auto_selected bit is properly sent.");
 </script>
diff --git a/tests/wpt/tests/credential-management/fedcm-basic.https.html b/tests/wpt/tests/credential-management/fedcm-basic.https.html
index d07c0de9577..3d20f4cfb74 100644
--- a/tests/wpt/tests/credential-management/fedcm-basic.https.html
+++ b/tests/wpt/tests/credential-management/fedcm-basic.https.html
@@ -16,7 +16,7 @@ import {fedcm_test,
 fedcm_test(async t => {
   const cred = await fedcm_get_and_select_first_account(t, request_options_with_mediation_required());
   assert_equals(cred.token, "token");
-  assert_equals(cred.isAccountAutoSelected, false);
+  assert_equals(cred.isAutoSelected, false);
 }, "Successfully obtaining token should resolve the promise.");
 
 </script>
diff --git a/tests/wpt/tests/credential-management/fedcm-login-status/confirm-idp-login.https.html b/tests/wpt/tests/credential-management/fedcm-login-status/confirm-idp-login.https.html
new file mode 100644
index 00000000000..54126c4d6b3
--- /dev/null
+++ b/tests/wpt/tests/credential-management/fedcm-login-status/confirm-idp-login.https.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FedCM IDP log-in status API 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 type="module">
+import {request_options_with_mediation_required,
+        fedcm_test,
+        fedcm_get_dialog_type_promise,
+        select_manifest,
+        mark_signed_in} from '../support/fedcm-helper.sub.js';
+
+fedcm_test(async t => {
+  await mark_signed_in();
+
+  let test_options = request_options_with_mediation_required("manifest_with_variable_accounts.json");
+  await select_manifest(t, test_options);
+
+  let cred_promise = navigator.credentials.get(test_options);
+  let type = await fedcm_get_dialog_type_promise(t);
+  assert_equals(type, "ConfirmIdpLogin");
+
+  // Manifest selection only persists for a single fetch, so we need to set it
+  // again because Chrome's implementation re-fetches the manifest as well, not
+  // just the accounts endpoint.
+  // (This is not technically spec-compliant)
+  await select_manifest(t, test_options);
+  await window.test_driver.confirm_idp_login();
+
+  // Now wait for the account chooser.
+  type = await fedcm_get_dialog_type_promise(t);
+  assert_equals(type, "AccountChooser");
+  window.test_driver.select_fedcm_account(0);
+
+  let cred = await cred_promise;
+  assert_equals(cred.token, "account_id=1234");
+}, 'Tests the IDP login dialog and subsequent account chooser.');
+</script>
diff --git a/tests/wpt/tests/credential-management/fedcm-login-status/cross-origin-status.https.html b/tests/wpt/tests/credential-management/fedcm-login-status/cross-origin-status.https.html
new file mode 100644
index 00000000000..7c839306a47
--- /dev/null
+++ b/tests/wpt/tests/credential-management/fedcm-login-status/cross-origin-status.https.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FedCM IDP login status API 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 type="module">
+import {fedcm_test,
+        alt_manifest_origin,
+        alt_request_options_with_mediation_required,
+        mark_signed_out} from '../support/fedcm-helper.sub.js';
+
+const url_prefix = alt_manifest_origin + '/credential-management/support/';
+
+fedcm_test(async t => {
+  await mark_signed_out(alt_manifest_origin);
+  // The header should be ignored because it's a cross-origin fetch.
+  const fetch_result = await fetch(url_prefix + "mark_signedin");
+  assert_true(fetch_result.ok);
+
+  const config = alt_request_options_with_mediation_required();
+  const result = navigator.credentials.get(config);
+  return promise_rejects_dom(t, 'NetworkError', result);
+}, 'Cross-origin status header should be ignored from fetch()');
+
+fedcm_test(async t => {
+  await mark_signed_out(alt_manifest_origin);
+  // The header should be ignored because it's a cross-origin iframe.
+  let iframe = document.createElement("iframe");
+  let iframe_load = new Promise(resolve => {iframe.onload = resolve;});
+  iframe.src = url_prefix + "mark_signedin";
+  document.body.appendChild(iframe);
+  await iframe_load;
+
+  const config = alt_request_options_with_mediation_required();
+  const result = navigator.credentials.get(config);
+  return promise_rejects_dom(t, 'NetworkError', result);
+}, 'Status header should be ignored from cross-origin iframe');
+
+fedcm_test(async t => {
+  await mark_signed_out(alt_manifest_origin);
+  // The header in the subresource should be ignored because the iframe is cross-origin.
+  let iframe = document.createElement("iframe");
+  let iframe_load = new Promise(resolve => {iframe.onload = resolve;});
+  iframe.src = url_prefix + "iframe-mark-signedin.html";
+  document.body.appendChild(iframe);
+  await iframe_load;
+
+  const config = alt_request_options_with_mediation_required();
+  const result = navigator.credentials.get(config);
+  return promise_rejects_dom(t, 'NetworkError', result);
+}, 'Status header should be ignored from cross-origin iframe that contains a subresource with the header');
+
+</script>
+
diff --git a/tests/wpt/tests/credential-management/fedcm-login-status/logged-out.https.html b/tests/wpt/tests/credential-management/fedcm-login-status/logged-out.https.html
new file mode 100644
index 00000000000..09750ff0968
--- /dev/null
+++ b/tests/wpt/tests/credential-management/fedcm-login-status/logged-out.https.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FedCM IDP sign-in status API 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 type="module">
+import {request_options_with_mediation_required,
+        fedcm_test,
+        alt_manifest_origin,
+        alt_request_options_with_mediation_required,
+        fedcm_get_and_select_first_account,
+        mark_signed_out} from '../support/fedcm-helper.sub.js';
+
+async function createIframeWithPermissionPolicyAndWaitForMessage(test, iframeUrl) {
+  const messageWatcher = new EventWatcher(test, window, "message");
+  let iframe = document.createElement("iframe");
+  iframe.src = iframeUrl;
+  iframe.allow = "identity-credentials-get";
+  document.body.appendChild(iframe);
+  const message = await messageWatcher.wait_for("message");
+  return message.data;
+}
+
+fedcm_test(async t => {
+  await mark_signed_out();
+  const config = request_options_with_mediation_required();
+  const result = navigator.credentials.get(config);
+  return promise_rejects_dom(t, 'NetworkError', result);
+}, 'FedCM request should fail because we are marked as not logged in');
+
+fedcm_test(async t => {
+  // Log in so that the browser allows the later user info request.
+  const cred = await fedcm_get_and_select_first_account(t, alt_request_options_with_mediation_required());
+  assert_equals(cred.token, "token");
+
+  await mark_signed_out(alt_manifest_origin);
+
+  const iframe_in_idp_scope = `${alt_manifest_origin}/\
+credential-management/support/fedcm/userinfo-iframe.html`;
+  const message = await createIframeWithPermissionPolicyAndWaitForMessage(t, iframe_in_idp_scope);
+  assert_equals(message.result, "Fail");
+
+}, 'User info request should fail because we are marked as not logged in');
+</script>
diff --git a/tests/wpt/tests/credential-management/fedcm-returning-account-auto-reauthn.https.html b/tests/wpt/tests/credential-management/fedcm-returning-account-auto-reauthn.https.html
index 38c07f0a60a..c9fe10a485f 100644
--- a/tests/wpt/tests/credential-management/fedcm-returning-account-auto-reauthn.https.html
+++ b/tests/wpt/tests/credential-management/fedcm-returning-account-auto-reauthn.https.html
@@ -29,6 +29,6 @@ fedcm_test(async t => {
   // "Jane" is a new user, the second account "John" will be selected.
   cred = await navigator.credentials.get(test_options);
   assert_equals(cred.token, "account_id=john_doe");
-  assert_equals(cred.isAccountAutoSelected, true);
+  assert_equals(cred.isAutoSelected, true);
 }, "Test that the returning account from the two accounts will be auto re-authenticated.");
 </script>
diff --git a/tests/wpt/tests/credential-management/support/fedcm-helper.sub.js b/tests/wpt/tests/credential-management/support/fedcm-helper.sub.js
index c422c6594ce..ef10e41793a 100644
--- a/tests/wpt/tests/credential-management/support/fedcm-helper.sub.js
+++ b/tests/wpt/tests/credential-management/support/fedcm-helper.sub.js
@@ -39,6 +39,12 @@ export function mark_signed_in(origin = manifest_origin) {
   });
 }
 
+export function mark_signed_out(origin = manifest_origin) {
+  return new Promise(resolve => {
+    open_and_wait_for_popup(origin, '/credential-management/support/mark_signedout', resolve);
+  });
+}
+
 // Returns FedCM CredentialRequestOptions for which navigator.credentials.get()
 // succeeds.
 export function request_options_with_mediation_required(manifest_filename) {
diff --git a/tests/wpt/tests/credential-management/support/fedcm/login.html b/tests/wpt/tests/credential-management/support/fedcm/login.html
new file mode 100644
index 00000000000..78d241cda95
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/fedcm/login.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<script>
+async function doLogin() {
+  document.cookie = "accounts=1";
+  navigator.login.setStatus("logged-in");
+  IdentityProvider.close();
+}
+window.onload = doLogin;
+</script>
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest-not-in-list.json b/tests/wpt/tests/credential-management/support/fedcm/manifest-not-in-list.json
index e6f5a1bbf32..00700666675 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest-not-in-list.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest-not-in-list.json
@@ -2,5 +2,5 @@
   "accounts_endpoint": "accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest.py b/tests/wpt/tests/credential-management/support/fedcm/manifest.py
index f8dced8f561..ba9ec9c9d47 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest.py
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest.py
@@ -14,6 +14,6 @@ def main(request, response):
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token.py",
   "revocation_endpoint": "revoke.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
 """
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_accounts.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_accounts.json
index 4a8a5469fa9..6a8972feebd 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_accounts.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_accounts.json
@@ -2,5 +2,5 @@
   "accounts_endpoint": "/common/redirect.py?location=/credential-management/support/fedcm/accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_token.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_token.json
index 35e75d10c22..affe34f8f31 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_token.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_redirect_token.json
@@ -3,5 +3,5 @@
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "/common/redirect.py?location=/credential-management/support/fedcm/token.py&status=308",
   "revocation_endpoint": "revoke.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_account_auto_selected_flag.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_account_auto_selected_flag.json
deleted file mode 100644
index e3f38b7983f..00000000000
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_account_auto_selected_flag.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "accounts_endpoint": "two_accounts.py",
-  "client_metadata_endpoint": "client_metadata.py",
-  "id_assertion_endpoint": "token_with_account_auto_selected_flag.py",
-  "login_url": "signin.html"
-}
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_auto_selected_flag.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_auto_selected_flag.json
new file mode 100644
index 00000000000..591c927153b
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_auto_selected_flag.json
@@ -0,0 +1,6 @@
+{
+  "accounts_endpoint": "two_accounts.py",
+  "client_metadata_endpoint": "client_metadata.py",
+  "id_assertion_endpoint": "token_with_auto_selected_flag.py",
+  "login_url": "login.html"
+}
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_no_accounts.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_no_accounts.json
index 761a38b4377..0d38f26d350 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_no_accounts.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_no_accounts.json
@@ -2,5 +2,5 @@
   "accounts_endpoint": "no_accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token_with_account_id.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_single_account.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_single_account.json
index 72b0d6bcb7e..5f9b7a81b9a 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_single_account.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_single_account.json
@@ -2,5 +2,5 @@
   "accounts_endpoint": "single_account.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token_with_account_id.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_two_accounts.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_two_accounts.json
index 00ae4cbe62c..6310fb0a0be 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_two_accounts.json
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_two_accounts.json
@@ -2,5 +2,5 @@
   "accounts_endpoint": "two_accounts.py",
   "client_metadata_endpoint": "client_metadata.py",
   "id_assertion_endpoint": "token_with_account_id.py",
-  "login_url": "signin.html"
+  "login_url": "login.html"
 }
diff --git a/tests/wpt/tests/credential-management/support/fedcm/manifest_with_variable_accounts.json b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_variable_accounts.json
new file mode 100644
index 00000000000..10c2ddd55d1
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/fedcm/manifest_with_variable_accounts.json
@@ -0,0 +1,6 @@
+{
+  "accounts_endpoint": "variable_accounts.py",
+  "client_metadata_endpoint": "client_metadata.py",
+  "id_assertion_endpoint": "token_with_account_id.py",
+  "login_url": "login.html"
+}
diff --git a/tests/wpt/tests/credential-management/support/fedcm/token_with_account_auto_selected_flag.py b/tests/wpt/tests/credential-management/support/fedcm/token_with_auto_selected_flag.py
similarity index 63%
rename from tests/wpt/tests/credential-management/support/fedcm/token_with_account_auto_selected_flag.py
rename to tests/wpt/tests/credential-management/support/fedcm/token_with_auto_selected_flag.py
index 6de26fe5aab..93ccf3ee7e2 100644
--- a/tests/wpt/tests/credential-management/support/fedcm/token_with_account_auto_selected_flag.py
+++ b/tests/wpt/tests/credential-management/support/fedcm/token_with_auto_selected_flag.py
@@ -8,5 +8,5 @@ def main(request, response):
 
   response.headers.set(b"Content-Type", b"application/json")
 
-  is_account_auto_selected = request.POST.get(b"is_account_auto_selected")
-  return "{\"token\": \"is_account_auto_selected=" + is_account_auto_selected.decode("utf-8") + "\"}"
+  is_auto_selected = request.POST.get(b"is_auto_selected")
+  return "{\"token\": \"is_auto_selected=" + is_auto_selected.decode("utf-8") + "\"}"
diff --git a/tests/wpt/tests/credential-management/support/fedcm/variable_accounts.py b/tests/wpt/tests/credential-management/support/fedcm/variable_accounts.py
new file mode 100644
index 00000000000..c9db2c4528e
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/fedcm/variable_accounts.py
@@ -0,0 +1,33 @@
+import importlib
+error_checker = importlib.import_module("credential-management.support.fedcm.request-params-check")
+
+def main(request, response):
+  request_error = error_checker.accountsCheck(request)
+  if (request_error):
+    return request_error
+
+  response.headers.set(b"Content-Type", b"application/json")
+
+  if request.cookies.get(b"accounts") != b"1":
+    return """
+{
+ "accounts": [
+  ]
+}
+"""
+
+
+  return """
+{
+ "accounts": [{
+   "id": "1234",
+   "given_name": "John",
+   "name": "John Doe",
+   "email": "john_doe@idp.example",
+   "picture": "https://idp.example/profile/123",
+   "approved_clients": ["123", "456", "789"],
+   "login_hints": ["john_doe"],
+   "hosted_domains": ["idp.example", "example"]
+  }]
+}
+"""
diff --git a/tests/wpt/tests/credential-management/support/mark_signedin.headers b/tests/wpt/tests/credential-management/support/mark_signedin.headers
deleted file mode 100644
index 21ee3bbb24c..00000000000
--- a/tests/wpt/tests/credential-management/support/mark_signedin.headers
+++ /dev/null
@@ -1,2 +0,0 @@
-Content-Type: text/html
-Idp-Signin-Status: action=signin
diff --git a/tests/wpt/tests/credential-management/support/mark_signedin.sub.headers b/tests/wpt/tests/credential-management/support/mark_signedin.sub.headers
new file mode 100644
index 00000000000..b87b36fa3b3
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/mark_signedin.sub.headers
@@ -0,0 +1,4 @@
+Content-Type: text/html
+Set-Login: logged-in
+Access-Control-Allow-Origin: https://{{host}}:{{ports[https][0]}}
+Access-Control-Allow-Credentials: true
diff --git a/tests/wpt/tests/credential-management/support/mark_signedout b/tests/wpt/tests/credential-management/support/mark_signedout
new file mode 100644
index 00000000000..d9adcaa7629
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/mark_signedout
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<body>
+<script>
+// The important part of this page are the headers.
+
+// If this page was opened as a popup, notify the opener.
+if (window.opener) {
+  window.opener.postMessage("done_loading", "*");
+}
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/credential-management/support/mark_signedout.sub.headers b/tests/wpt/tests/credential-management/support/mark_signedout.sub.headers
new file mode 100644
index 00000000000..46a8c34b218
--- /dev/null
+++ b/tests/wpt/tests/credential-management/support/mark_signedout.sub.headers
@@ -0,0 +1,4 @@
+Content-Type: text/html
+Set-Login: logged-out
+Access-Control-Allow-Origin: https://{{host}}:{{ports[https][0]}}
+Access-Control-Allow-Credentials: true
diff --git a/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html b/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html
new file mode 100644
index 00000000000..3a48dae4b6d
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values-with-floats.tentative.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#blockwidth">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9174">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<style>
+.container {
+  display: flow-root;
+  width: 100px;
+  padding: 5px;
+  box-sizing: border-box;
+}
+.box {
+  display: flow-root;
+  width: 40px;
+  height: 10px;
+  background: lime;
+}
+.float {
+  float: right;
+  width: 20px;
+  height: 40px;
+  background: cyan;
+}
+</style>
+<body onload="checkLayout('.box')">
+  <div class="container">
+    <div class="float"></div>
+    <div class="box" style="margin: auto;" data-expected-margin-left="15" data-expected-margin-right="35"></div>
+    <div class="box" style="margin-left: auto;" data-expected-margin-left="30" data-expected-margin-right="0"></div>
+    <div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
+  </div>
+  <div class="container" style="direction: rtl;">
+    <div class="float"></div>
+    <div class="box" style="margin: auto;" data-expected-margin-left="15" data-expected-margin-right="35"></div>
+    <div class="box" style="margin-left: auto;" data-expected-margin-left="30" data-expected-margin-right="0"></div>
+    <div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values.html b/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values.html
new file mode 100644
index 00000000000..d4c7ac3f01a
--- /dev/null
+++ b/tests/wpt/tests/css/CSS2/normal-flow/auto-margins-used-values.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#blockwidth">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<style>
+.container {
+  display: flow-root;
+  width: 100px;
+  padding: 5px;
+  box-sizing: border-box;
+}
+.box {
+  display: flow-root;
+  width: 40px;
+  height: 10px;
+  background: lime;
+}
+</style>
+<body onload="checkLayout('.box')">
+  <div class="container">
+    <div class="box" style="margin: auto;" data-expected-margin-left="25" data-expected-margin-right="25"></div>
+    <div class="box" style="margin-left: auto;" data-expected-margin-left="50" data-expected-margin-right="0"></div>
+    <div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
+  </div>
+  <div class="container" style="direction: rtl;">
+    <div class="box" style="margin: auto;" data-expected-margin-left="25" data-expected-margin-right="25"></div>
+    <div class="box" style="margin-left: auto;" data-expected-margin-left="50" data-expected-margin-right="0"></div>
+    <div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed-multiple.html b/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed-multiple.html
new file mode 100644
index 00000000000..0e582310c3c
--- /dev/null
+++ b/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed-multiple.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Compositing and Blending Level 1: getComputedStyle().backgroundBlendMode</title>
+<link rel="help" href="https://drafts.fxtf.org/compositing-1/#propdef-background-blend-mode">
+<meta name="assert" content="background-blend-mode computed value is as specified even when the number of images vary.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+<style>
+    #target {
+        background-image: linear-gradient(green, green), linear-gradient(green, green), linear-gradient(green, green);
+    }
+</style>
+</head>
+<body>
+<div id="target"></div>
+<script>
+// This is testing the case with multiple background images
+//
+// see https://drafts.fxtf.org/compositing-1/#background-blend-mode
+// and https://drafts.csswg.org/css-backgrounds-3/#layering
+// > The lists are matched up from the first value: excess values at the end are not used.
+// and
+// > If a property doesn’t have enough comma-separated values
+// > to match the number of layers, the UA must calculate its used value
+// > by repeating the list of values until there are enough.
+// but in https://drafts.csswg.org/css-values-4/#linked-properties
+// it was decided that
+// > The computed values of the coordinating list properties are not affected by such truncation or repetition.
+//
+// There is a distinction between specified values, used values, and computed values.
+
+// if three images and one value, just send back the specified list.
+test_computed_value("background-blend-mode", "normal");
+test_computed_value("background-blend-mode", "multiply");
+
+// if three images and two values, just send back the specified list.
+test_computed_value("background-blend-mode", "normal, luminosity");
+test_computed_value("background-blend-mode", "screen, overlay");
+test_computed_value("background-blend-mode", "color, saturation");
+
+// if three images and three values, just send back the specified list.
+test_computed_value("background-blend-mode", "normal, luminosity, color");
+test_computed_value("background-blend-mode", "screen, overlay, screen");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed.html b/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed.html
index 22d6a5f380c..934159d8a67 100644
--- a/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed.html
+++ b/tests/wpt/tests/css/compositing/parsing/background-blend-mode-computed.html
@@ -29,6 +29,17 @@ test_computed_value("background-blend-mode", "saturation");
 test_computed_value("background-blend-mode", "color");
 test_computed_value("background-blend-mode", "luminosity");
 
+// Per spec, excess values should not be used,
+// BUT the computed style should be similar to the specified values.
+// see https://drafts.fxtf.org/compositing-1/#background-blend-mode
+// and https://drafts.csswg.org/css-backgrounds-3/#layering
+// > The lists are matched up from the first value: excess values at the end are not used.
+// but in https://drafts.csswg.org/css-values-4/#linked-properties
+// it was decided that
+// > The computed values of the coordinating list properties are not affected by such truncation or repetition.
+//
+// There is a distinction between specified values, used values, and computed values.
+
 test_computed_value("background-blend-mode", "normal, luminosity");
 test_computed_value("background-blend-mode", "screen, overlay");
 test_computed_value("background-blend-mode", "color, saturation");
diff --git a/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2-ref.html b/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2-ref.html
index 6a4ef234b0b..2619a196d77 100644
--- a/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2-ref.html
+++ b/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2-ref.html
@@ -5,7 +5,6 @@
     background-color: blue;
     color: transparent;
     font: 50px/1 monospace;
-    -webkit-background-clip: text;
     background-clip: text;
     height: 200px;
   }
diff --git a/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2.html b/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2.html
index 57a31266bec..ee6b45c2ddf 100644
--- a/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2.html
+++ b/tests/wpt/tests/css/css-backgrounds/background-clip/clip-text-dynamic-2.html
@@ -11,7 +11,6 @@
     background-color: blue;
     color: transparent;
     font: 50px/1 monospace;
-    -webkit-background-clip: text;
     background-clip: text;
     height: 200px;
   }
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-image-type-001.htm b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-001.htm
index ebc152fe74bd165b68cda0953ce3ef5545aa998d..9486f0b8b6e2d5fcccda1e7d44084db4c6722219 100644
GIT binary patch
literal 1536
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diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-image-type-002.htm b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-002.htm
index 39adbb34d0bbc93b2375240bb75873c167c5282c..f365793e3f4c40fea9a51be8fd247855c77f76cc 100644
GIT binary patch
literal 1858
zcmah}ZExE)5dNNDan(?yMNLtTJ7Do-f5;2A0&N#8UblUuB}yVfi5hwGOY8pk9VsWV
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literal 2900
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ZH;z!l4VQ}JvLuL7p9OLO<8Wtg*grw0u~Yy6

diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-image-type-004.htm b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-004.htm
new file mode 100644
index 00000000000..222267ca636
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-004.htm
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+    <head>
+        <title>CSS Backgrounds and Borders Test: The 'border-image-source' property with an SVG image as a value and the 'border-image-slice' property with four number values</title>
+        <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
+        <link rel="help" href="http://www.w3.org/TR/css3-background/#the-border-image-slice" />
+        <link rel="match" href="reference/border-image-image-type-004-ref.html" />
+        <meta name="flags" content="svg" />
+        <meta name="assert" content="This test checks that the SVG image used for the border image is sliced into nine regions with inward offsets of: '40 30 20 10' vector coordinates from the top, right, bottom, and left edges of the image set by the 'border-image-slice' property." />
+        <meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-100" />
+        <style type="text/css">
+            div
+            {
+                border: 50px double red;
+                border-image-slice: 40 30 20 10;
+                border-image-source: url("support/9-colored-areas-40-30-20-10.svg");
+                height: 0px;
+                width: 0px;
+            }
+        </style>
+    </head>
+    <body>
+          <p>Test passes if there is a filled yellow square, then, on its right-hand side, a contiguous filled aqua square, then, below, a contiguous filled fuchsia square and finally a filled black square and <strong>no red</strong>.</p>
+        <div></div>
+
+  <!--
+
+  Expected result:
+
+ (0,100) (50,100) (100,100)
+   + - - - - - - -+
+   |       ^      |
+   |Yellow50 Aqua |
+   |       v      |
+   | - - - - - - -|
+   |       ^      |
+   |Fuchsi50 Black|
+   |       v      |
+   | - - - - - - -|
+ (0,0)          (100,0)
+
+  -->
+
+    </body>
+</html>
diff --git a/tests/wpt/tests/css/css-backgrounds/border-image-image-type-005.htm b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-005.htm
new file mode 100644
index 00000000000..cb2668d7dd6
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/border-image-image-type-005.htm
@@ -0,0 +1,45 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+    <head>
+        <title>CSS Backgrounds and Borders Test: The 'border-image-source' property with an SVG image as a value and the 'border-image-slice' property with percentage values</title>
+        <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
+        <link rel="help" href="http://www.w3.org/TR/css3-background/#the-border-image-slice" />
+        <link rel="match" href="reference/border-image-image-type-004-ref.html" />
+        <meta name="flags" content="svg" />
+        <meta name="assert" content="This test checks that border image is sliced into nine regions with inward offsets of: '40% 30% 20% 10%' from the top, right, bottom, and left edges of the image. Percentages are relative to the size of the image: the width of the image for the horizontal offsets, the height for vertical offsets." />
+        <meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-100" />
+        <style type="text/css">
+            div
+            {
+                border: 50px double red;
+                border-image-slice: 40% 30% 20% 10%;
+                border-image-source: url("support/9-colored-areas-40-30-20-10.svg");
+                height: 0px;
+                width: 0px;
+            }
+        </style>
+    </head>
+    <body>
+        <p>Test passes if there is a filled yellow square, then, on its right-hand side, a contiguous filled aqua square, then, below, a contiguous filled fuchsia square and finally a filled black square and <strong>no red</strong>.</p>
+        <div></div>
+
+  <!--
+
+  Expected result:
+
+ (0,100) (50,100) (100,100)
+   + - - - - - - -+
+   |       ^      |
+   |Yellow50 Aqua |
+   |       v      |
+   | - - - - - - -|
+   |       ^      |
+   |Fuchsi50 Black|
+   |       v      |
+   | - - - - - - -|
+ (0,0)          (100,0)
+
+  -->
+
+    </body>
+</html>
diff --git a/tests/wpt/tests/css/css-backgrounds/box-shadow-border-radius-001.html b/tests/wpt/tests/css/css-backgrounds/box-shadow-border-radius-001.html
index 6f81ca81fac..de5060e5b86 100644
--- a/tests/wpt/tests/css/css-backgrounds/box-shadow-border-radius-001.html
+++ b/tests/wpt/tests/css/css-backgrounds/box-shadow-border-radius-001.html
@@ -20,6 +20,8 @@
 
   -->
 
+  <meta name="fuzzy" content="maxDifference=0-56;totalPixels=0-1192">
+
   <style>
   div
     {
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-001-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-001-ref.html
new file mode 100644
index 00000000000..feb13018476
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-001-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      border: 50px double red;
+      border-image-slice: 20 15 10 5;
+      border-image-source: url("../support/9-colored-areas-40-30-20-10.png");
+      height: 100px;
+      width: 100px;
+    }
+  </style>
+
+  <p>Test passes if there is an hollow square with thick borders made of 8 different colors (yellow, blue, aqua, orange, teal, fuchsia, purple and black) and if there is <strong>no red</strong>.
+
+  <div></div>
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-002-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-002-ref.html
new file mode 100644
index 00000000000..3fc7646417f
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-002-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      border: 50px double red;
+      border-image-slice: 40% 30% 20% 10%;
+      border-image-source: url("../support/9-colored-areas-40-30-20-10.png");
+      height: 100px;
+      width: 100px;
+    }
+  </style>
+
+  <p>Test passes if there is an hollow square with thick borders made of 8 different colors (yellow, blue, aqua, orange, teal, fuchsia, purple and black) and if there is <strong>no red</strong>.
+
+  <!--
+
+  Expected result:
+
+  +------------------+
+  |yel|   blue   |aqu|
+  |- - - - - - - - - |
+  |or |          | t |
+  | a |          | e |
+  | n |          | a |
+  |ge |          | l |
+  |- - - - - - - - - |
+  |fuc|  purple  |bla|
+  +------------------+
+
+  -->
+
+  <div></div>
diff --git a/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-004-ref.html b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-004-ref.html
new file mode 100644
index 00000000000..b1266827bfa
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/reference/border-image-image-type-004-ref.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reftest reference</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div
+    {
+      border: 50px double red;
+      border-image-slice: 40 30 20 10;
+      border-image-source: url("../support/9-colored-areas-40-30-20-10.png");
+      height: 0px;
+      width: 0px;
+    }
+  </style>
+
+  <p>Test passes if there is a filled yellow square, then, on its right-hand side, a contiguous filled aqua square, then, below, a contiguous filled fuchsia square and finally a filled black square and <strong>no red</strong>.
+
+  <div></div>
+
+  <!--
+
+  Expected result:
+
+ (0,100) (50,100) (100,100)
+   + - - - - - - -+
+   |       ^      |
+   |Yellow50 Aqua |
+   |       v      |
+   | - - - - - - -|
+   |       ^      |
+   |Fuchsi50 Black|
+   |       v      |
+   | - - - - - - -|
+ (0,0)          (100,0)
+
+  -->
diff --git a/tests/wpt/tests/css/css-backgrounds/support/9-colored-areas-40-30-20-10.png b/tests/wpt/tests/css/css-backgrounds/support/9-colored-areas-40-30-20-10.png
new file mode 100644
index 0000000000000000000000000000000000000000..3f640c76049ff37391ca8059b0bf7601ae456876
GIT binary patch
literal 4449
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zQQFgU#Ig3Qby`P?j=fVT-t~votHp|~wRfkUW3P%QR21x4;5uWEYCXNT8^AE_Ooy5F
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z?Dg?Zu9Ag?S}zN;BIkr4@zR#U?ky+Khrb`0qi=k6gDZZ&rJ;LI-z%H0_ZRKyj75>c
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literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/css/css-backgrounds/support/9-colored-areas-40-30-20-10.svg b/tests/wpt/tests/css/css-backgrounds/support/9-colored-areas-40-30-20-10.svg
new file mode 100644
index 00000000000..c5896a9255a
--- /dev/null
+++ b/tests/wpt/tests/css/css-backgrounds/support/9-colored-areas-40-30-20-10.svg
@@ -0,0 +1,32 @@
+
+<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
+
+  <!--
+
+  Author: Gérard Talbot
+
+  Created: August 9th 2023
+
+  Last modified: October 5th 2023
+
+  -->
+
+    <rect x="0" y="0" width="10" height="40" fill="yellow" />
+
+    <rect x="10" y="0" width="60" height="40" fill="blue" />
+
+    <rect x="70" y="0" width="30" height="40" fill="aqua" />
+
+    <rect x="0" y="40" width="10" height="40" fill="orange" />
+
+    <rect x="10" y="40" width="60" height="40" fill="red" />
+
+    <rect x="70" y="40" width="30" height="40" fill="teal" />
+
+    <rect x="0" y="80" width="10" height="20" fill="fuchsia" />
+
+    <rect x="10" y="80" width="60" height="20" fill="purple" />
+
+    <rect x="70" y="80" width="30" height="20" fill="black" />
+
+</svg>
diff --git a/tests/wpt/tests/css/css-break/background-image-003.html b/tests/wpt/tests/css/css-break/background-image-003.html
new file mode 100644
index 00000000000..be36d998d6e
--- /dev/null
+++ b/tests/wpt/tests/css/css-break/background-image-003.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/#break-decoration">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div id="container" style="columns:5; width:100px; gap:0; column-fill:auto; height:100px; background:red;">
+  <div style="height:250px; background:linear-gradient(red 50%, green 50%);">
+    <div style="height:500px;">
+      <div style="height:125px; background:green;"></div>
+      <div style="height:125px;"></div>
+      <div style="height:250px; background:green;"></div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-break/tall-float-pushed-to-next-fragmentainer-004.html b/tests/wpt/tests/css/css-break/tall-float-pushed-to-next-fragmentainer-004.html
new file mode 100644
index 00000000000..3f4d39fc1c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-break/tall-float-pushed-to-next-fragmentainer-004.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="width:100px; columns:5; gap:0; column-fill:auto; height:100px; background:red;">
+  <div style="width:1px; font:20px/20px Ahem; color:green;">
+    x
+    <div style="float:left; width:25px; height:200px; break-inside:avoid; background:green;"></div>
+    x x x x x x x x x x x x x x
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-cascade/all-prop-revert-layer.html b/tests/wpt/tests/css/css-cascade/all-prop-revert-layer.html
index 420a3a61cac..868267b2855 100644
--- a/tests/wpt/tests/css/css-cascade/all-prop-revert-layer.html
+++ b/tests/wpt/tests/css/css-cascade/all-prop-revert-layer.html
@@ -11,7 +11,6 @@
   align-content: baseline;
   align-items: baseline;
   align-self: baseline;
-  align-tracks: baseline;
   alignment-baseline: central;
   alt: "a";
   animation-composition: add;
@@ -174,7 +173,6 @@
   justify-content: center;
   justify-items: baseline;
   justify-self: baseline;
-  justify-tracks: center;
   kerning: 123px;
   left: 123px;
   letter-spacing: 123px;
@@ -338,6 +336,7 @@
   text-transform: lowercase;
   text-underline-offset: 123px;
   text-underline-position: under;
+  text-wrap-style: balance;
   timeline-scope: --foo;
   top: 123px;
   touch-action: none;
diff --git a/tests/wpt/tests/css/css-cascade/scope-cssom.html b/tests/wpt/tests/css/css-cascade/scope-cssom.html
index ad83848a408..3603fc0e83b 100644
--- a/tests/wpt/tests/css/css-cascade/scope-cssom.html
+++ b/tests/wpt/tests/css/css-cascade/scope-cssom.html
@@ -65,4 +65,9 @@ test(() => {
 test(() => {
   assert_equals(style.sheet.rules[3].end, '.b');
 }, 'CSSScopeRule.end, limit only');
+
+test(() => {
+  assert_true(style.sheet.rules[0] instanceof CSSGroupingRule);
+  assert_false(style.sheet.rules[0] instanceof CSSConditionRule);
+}, 'CSSScopeRule is a CSSGroupingRule');
 </script>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-024.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-024.html
index cf2faca345e..2c8f59d745a 100644
--- a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-024.html
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-024.html
@@ -6,6 +6,7 @@
 <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
 <link rel="match" href="content-visibility-024-ref.html">
 <meta name="assert" content="content-visibility hidden img element paints when hidden is removed">
+<meta name="fuzzy" content="maxDifference=0-5; totalPixels=0-100">
 
 <script src="/common/reftest-wait.js"></script>
 
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-092.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-092.html
new file mode 100644
index 00000000000..3d5482d59c2
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-092.html
@@ -0,0 +1,24 @@
+<!doctype HTML>
+<meta charset="utf8">
+<title>CSS Content Visibility: getComputedStyle works in hidden c-v subtree and an absolutely positioned element</title>
+<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<meta name="assert" content="getComputedStyle works in hidden c-v subtree and an absolutely positioned element">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+#container { content-visibility: hidden }
+</style>
+
+<div id=container style="width:200px">
+<div id=target style="width:50%;position: absolute"></div>
+</div>
+
+<script>
+test(() => {
+  const computedStyle = getComputedStyle(target);
+  assert_equals(computedStyle.width, "100px");
+}, "getComputedStyle works in hidden c-v subtree and an absolutely positioned element");
+</script>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-093.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-093.html
new file mode 100644
index 00000000000..a54fa407cbb
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-093.html
@@ -0,0 +1,24 @@
+<!doctype HTML>
+<meta charset="utf8">
+<title>CSS Content Visibility: getComputedStyle works on a grid container with c-v: hidden and an absolutely positioned child</title>
+<link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<meta name="assert" content="getComputedStyle works on a grid container with c-v: hidden and an absolutely positioned child">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+#container { content-visibility: hidden }
+</style>
+
+<div id=container style="display: grid; width:200px">
+<div id=target style="width:50%;position: absolute"></div>
+</div>
+
+<script>
+test(() => {
+  const computedStyle = getComputedStyle(target);
+  assert_equals(computedStyle.width, "100px");
+}, "getComputedStyle works on a grid container with c-v: hidden and an absolutely positioned child");
+</script>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-auto-text-fragment.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-auto-text-fragment.html
new file mode 100644
index 00000000000..d5184d72a4e
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-auto-text-fragment.html
@@ -0,0 +1,46 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>Content Visibility: navigating to a text fragment.</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<meta name="timeout" content="long">
+<meta name="assert" content="content-visibility: auto subtrees are 'searchable' by text fragment links">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<script>
+promise_test(t => new Promise((resolve, reject) => {
+    const fragment = '#:~:text=hiddentext';
+    const key = token();
+    test_driver.bless("Open a URL with a text fragment directive", () => {
+      window.open(`./resources/text-fragment-target-matchable.html?key=${key}${fragment}`,
+                  '_blank',
+                  'noopener');
+    });
+    fetchResults(key, resolve, reject);
+}).then(data => {
+  assert_equals(data.scrollPosition, "text");
+  assert_equals(data.target, "text");
+}), "Fragment navigation with content-visibility; single text");
+
+promise_test(t => new Promise((resolve, reject) => {
+    const fragment = '#:~:text=start,end';
+    const key = token();
+    test_driver.bless("Open a URL with a text fragment directive", () => {
+      window.open(`./resources/text-fragment-target-matchable.html?key=${key}${fragment}`,
+                  '_blank',
+                  'noopener');
+    });
+    fetchResults(key, resolve, reject);
+}).then(data => {
+  assert_equals(data.scrollPosition, "text2");
+  assert_equals(data.target, "text2and3ancestor");
+}), "Fragment navigation with content-visibility; range across blocks");
+</script>
+
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g-ref.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g-ref.html
new file mode 100644
index 00000000000..e93425d5ff8
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS Content Visibility: effect on <g> element (reference)</title>
+<link rel="author" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+
+<div>
+  <svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
+    <g>
+      <text x="5" y="16" transform="scale(2, 2)">Hello World!</text>
+      <text x="8" y="32" transform="translate(0 20) scale(1.25 1)">Hello World Again!</text>
+    </g>
+  </svg>
+</div>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g.html
new file mode 100644
index 00000000000..4ff07892680
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-g.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>CSS Content Visibility: effect on <g> element</title>
+<link rel="author" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<link rel="match" href="content-visibility-on-g-ref.html">
+<meta name="assert" content="content-visibility hidden has no effect on g element">
+
+<div>
+  <svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
+    <g style="content-visibility:hidden">
+      <text x="5" y="16" transform="scale(2, 2)">Hello World!</text>
+      <text x="8" y="32" transform="translate(0 20) scale(1.25 1)">Hello World Again!</text>
+    </g>
+  </svg>
+</div>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg-ref.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg-ref.html
new file mode 100644
index 00000000000..258cdfacab6
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<title>CSS Content Visibility: effect on root <svg> element (reference)</title>
+<link rel="author" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg.html b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg.html
new file mode 100644
index 00000000000..440d1ad94bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/content-visibility-on-root-svg.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>CSS Content Visibility: effect on root <svg> element</title>
+<link rel="author" href="mailto:rbuis@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<link rel="match" href="content-visibility-on-root-svg-ref.html">
+<meta name="assert" content="content-visibility hidden has an effect on root svg element">
+
+<div>
+  <svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg" style="content-visibility:hidden">
+    <g>
+      <text x="5" y="16" transform="scale(2, 2)">Hello World!</text>
+      <text x="8" y="32" transform="translate(0 20) scale(1.25 1)">Hello World Again!</text>
+    </g>
+  </svg>
+</div>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/locked-frame-crash.html b/tests/wpt/tests/css/css-contain/content-visibility/locked-frame-crash.html
new file mode 100644
index 00000000000..dce0baa62ed
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/locked-frame-crash.html
@@ -0,0 +1,8 @@
+<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
+<link rel="help" href="https://crbug.com/1309693">
+
+<iframe id="target" width=320 height=320></iframe>
+<style>
+:first-child { content-visibility: hidden; }
+html,body,ol { -webkit-column-count: 2; }
+</style>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/resources/text-fragment-target-matchable.html b/tests/wpt/tests/css/css-contain/content-visibility/resources/text-fragment-target-matchable.html
new file mode 100644
index 00000000000..6d57a2ebbd1
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/resources/text-fragment-target-matchable.html
@@ -0,0 +1,61 @@
+<!doctype html>
+<title>Text fragment navigation helper.</title>
+
+<script src="/scroll-to-text-fragment/stash.js"></script>
+<script>
+function isInView(element) {
+  let rect = element.getBoundingClientRect();
+  return rect.top >= 0 && rect.top <= window.innerHeight
+      && rect.left >= 0 && rect.left <= window.innerWidth;
+}
+function checkScroll() {
+  let position = 'unknown';
+  if (window.scrollY == 0)
+    position = 'top';
+  else if(isInView(document.getElementById("text")))
+    position = 'text';
+  else if(isInView(document.getElementById("text2")))
+    position = 'text2';
+  else if(isInView(document.getElementById("text3")))
+    position = 'text3';
+
+  const target = document.querySelector(":target");
+  let results = {
+    scrollPosition: position,
+    href: window.location.href,
+    target: target ? target.id : 'undefined'
+  };
+  let key = (new URL(document.location)).searchParams.get("key");
+  stashResultsThenClose(key, results);
+}
+function doubleRafCheckScroll() {
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      checkScroll();
+    });
+  });
+}
+</script>
+
+<style>
+.spacer {
+  height: 10000px;
+}
+</style>
+
+<body onload="doubleRafCheckScroll()">
+<div class=spacer></div>
+<div hidden=until-found>
+  <div id=text>hiddentext</div>
+</div>
+<div class=spacer></div>
+<div id=text2and3ancestor>
+  <div hidden=until-found>
+    <div id=text2>start</div>
+  </div>
+  <div class=spacer></div>
+  <div hidden=until-found>
+    <div id=text3>end</div>
+  </div>
+</div>
+</body>
diff --git a/tests/wpt/tests/css/css-contain/content-visibility/touch-action-beside-display-locked-fixedpos-iframe-crash.html b/tests/wpt/tests/css/css-contain/content-visibility/touch-action-beside-display-locked-fixedpos-iframe-crash.html
new file mode 100644
index 00000000000..920305c14dd
--- /dev/null
+++ b/tests/wpt/tests/css/css-contain/content-visibility/touch-action-beside-display-locked-fixedpos-iframe-crash.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+  <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1434550">
+  <button id="boo"></button>
+  <div>
+    <iframe style="position:fixed; content-visibility:hidden;"></iframe>
+  </div>
+  <script>
+    requestAnimationFrame(()=> {
+      requestAnimationFrame(()=> {
+        boo.style.touchAction = "pan-x";
+        document.documentElement.classList.remove("reftest-wait");
+      });
+    });
+  </script>
+</html>
diff --git a/tests/wpt/tests/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html b/tests/wpt/tests/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html
new file mode 100644
index 00000000000..5fcb75e6cd5
--- /dev/null
+++ b/tests/wpt/tests/css/css-flexbox/baseline-synthesis-vert-lr-line-under.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<head>
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#baseline-export">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-4/#line-under">
+<meta name="assert" content="Line under edge of vertical-lr/sideways item is at its block start edge">
+<style>
+.flexbox {
+    display: flex;
+    writing-mode: vertical-lr;
+    text-orientation: sideways;
+    align-items: baseline;
+    background-color: red;
+    position: relative;
+}
+.item {
+    width: 50px;
+    height: 50px;
+    background-color: green;
+}
+.wide {
+    width: 100px;
+}
+.absolute {
+    position: absolute;
+    top: 50px;
+    left: 50px;
+}
+</style>
+</head>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<body>
+    <div class="flexbox">
+        <div class="item wide"></div>
+        <div class="item"></div>
+        <div class="item absolute"></div>
+    </div>
+</body>
diff --git a/tests/wpt/tests/css/css-fonts/animations/multiple-elements-font-palette-animation.html b/tests/wpt/tests/css/css-fonts/animations/multiple-elements-font-palette-animation.html
new file mode 100644
index 00000000000..a3804487d2a
--- /dev/null
+++ b/tests/wpt/tests/css/css-fonts/animations/multiple-elements-font-palette-animation.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>Font-palette animation of multiple elements</title>
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#propdef-font-palette">
+<meta name="assert" content="Animating font-palette CSS property of multiple elements.">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  @font-face {
+    font-family: "COLR-test-font";
+    src: url("../resources/COLR-palettes-test-font.ttf") format("truetype");
+  }
+  @font-palette-values --custom {
+    font-family: "COLR-test-font";
+    base-palette: 3;
+  }
+  @keyframes anim {
+    from {
+      font-palette: normal;
+    }
+    to {
+      font-palette: --custom;
+    }
+  }
+  .demo {
+    font-family: "COLR-test-font";
+    font-size: 130px;
+  }
+  .anim {
+    animation: anim 0.1s forwards;
+  }
+</style>
+
+<body>
+  <div class="demo">
+    <div id="a" class="anim">A</div><div id="b" class="anim">A</div>
+  </div>
+</body>
+
+<script>
+  var afterPaletteAnimationTest1 = async_test(
+    "Verify font-palette value of the first element after animation"
+  );
+  document.getElementById("a").addEventListener("animationend",
+    afterPaletteAnimationTest1.step_func_done(function() {
+        assert_equals(window.getComputedStyle(
+                document.getElementById("a"))
+            .getPropertyValue('font-palette'), "--custom");
+    }));
+
+  var afterPaletteAnimationTest2 = async_test(
+    "Verify font-palette value of the second element after animation"
+  );
+  document.getElementById("b").addEventListener("animationend",
+    afterPaletteAnimationTest2.step_func_done(function() {
+        assert_equals(window.getComputedStyle(
+                document.getElementById("b"))
+            .getPropertyValue('font-palette'), "--custom");
+    }));
+</script>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-fonts/fallback-url-to-local.html b/tests/wpt/tests/css/css-fonts/fallback-url-to-local.html
index c30af93d149..e4aeb240913 100644
--- a/tests/wpt/tests/css/css-fonts/fallback-url-to-local.html
+++ b/tests/wpt/tests/css/css-fonts/fallback-url-to-local.html
@@ -9,7 +9,7 @@
 <style>
 @font-face {
   font-family: remote-font;
-  src: url(/fonts/Revalia.woff?pipe=trickle(d1)) format(woff);
+  src: url("/fonts/Revalia.woff?pipe=trickle(d1)") format(woff);
 }
 
 @font-face {
diff --git a/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA-ref.html b/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA-ref.html
new file mode 100644
index 00000000000..01b95e8e72e
--- /dev/null
+++ b/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<link rel="author" title="Vitor Roriz" href="https://github.com/vitorroriz">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#char-handling-issues">
+<style>
+.target {
+    font-family: serif, sans-serif, cursive, fantasy, monospace, system-ui, emoji, math, fangsong, ui-serif, ui-sans-serif, ui-monospace, ui-rounded, 'Times';
+}
+p {
+    font-size: 22px;
+}
+.times {
+    font-family: 'Times';
+}
+</style>
+</head>
+<body>
+"If a given character is a Private-Use Area Unicode codepoint, user agents must only match font families named in the font-family list that are not generic families. If none of the families named in the font-family list contain a glyph for that codepoint, user agents must display some form of missing glyph symbol for that character rather than attempting installed font fallback for that codepoint." - <a href="https://drafts.csswg.org/css-fonts-4/#char-handling-issues">css-fonts-4</a>
+<h3>The first line should render as the second. This means that no generic font was used during fallback and the first non generic font was used. </h3>
+<p class="times">&#xE0AD;&#xE0AE;&#xE0AD;&#xE0AF;&#xE0B0;&#xE0B1;&#xE0C0;&#xE0C1;&#xE0D3;&#xE0D4;</p>
+<p class="times">&#xE0AD;&#xE0AE;&#xE0AD;&#xE0AF;&#xE0B0;&#xE0B1;&#xE0C0;&#xE0C1;&#xE0D3;&#xE0D4;</p>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA.html b/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA.html
new file mode 100644
index 00000000000..9ed897aa006
--- /dev/null
+++ b/tests/wpt/tests/css/css-fonts/matching/font-unicode-PUA.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<link rel="author" title="Vitor Roriz" href="https://github.com/vitorroriz">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#char-handling-issues">
+<link rel="match" href="./font-unicode-PUA-ref.html">
+<style>
+.target {
+    font-family: serif, sans-serif, cursive, fantasy, monospace, system-ui, emoji, math, fangsong, ui-serif, ui-sans-serif, ui-monospace, ui-rounded, 'Times';
+}
+p {
+    font-size: 22px;
+}
+.times {
+    font-family: 'Times';
+}
+</style>
+</head>
+<body>
+"If a given character is a Private-Use Area Unicode codepoint, user agents must only match font families named in the font-family list that are not generic families. If none of the families named in the font-family list contain a glyph for that codepoint, user agents must display some form of missing glyph symbol for that character rather than attempting installed font fallback for that codepoint." - <a href="https://drafts.csswg.org/css-fonts-4/#char-handling-issues">css-fonts-4</a>
+<h3>The first line should render as the second. This means that no generic font was used during fallback and the first non generic font was used. </h3>
+<p class="target">&#xE0AD;&#xE0AE;&#xE0AD;&#xE0AF;&#xE0B0;&#xE0B1;&#xE0C0;&#xE0C1;&#xE0D3;&#xE0D4;</p>
+<p class="times">&#xE0AD;&#xE0AE;&#xE0AD;&#xE0AF;&#xE0B0;&#xE0B1;&#xE0C0;&#xE0C1;&#xE0D3;&#xE0D4;</p>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-fonts/size-adjust-tentative-ref.html b/tests/wpt/tests/css/css-fonts/size-adjust-tentative-ref.html
index db8f8a46772..d3849b0a5be 100644
--- a/tests/wpt/tests/css/css-fonts/size-adjust-tentative-ref.html
+++ b/tests/wpt/tests/css/css-fonts/size-adjust-tentative-ref.html
@@ -34,7 +34,7 @@
 </div>
 
 <p>In a text node with multiple fonts, size-adjust should only scale characters in the modified font. In the test case below, digits should be scaled, but not letters.</p>
-<div class="target">
+<div class="target" style="height: 30px">
   123<span class="unaffected">xxx</span>
 </div>
 
@@ -47,6 +47,6 @@
 </div>
 
 <p>The computed 'font-size' value (i.e., 'em') should not be affected. But 'ex' should be scaled since it's measured from the actual glyph.</p>
-<div class="target" style="font-size: 20px">
+<div class="target" style="font-size: 20px; line-height: 1">
   <span class="square" style="--l: 1em"></span><span class="square" style="--l: 0.5ex"></span>
 </div>
diff --git a/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback-ref.html b/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback-ref.html
index 46586c6f538..c14d922a705 100644
--- a/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback-ref.html
+++ b/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback-ref.html
@@ -5,7 +5,7 @@
 <style>
 @font-face {
   font-family: large-font;
-  src: local(Ahem), url(/fonts/ahem.ttf);
+  src: local(Ahem), url(/fonts/Ahem.ttf);
   size-adjust: 1000%;
   unicode-range: U+0020;
 }
diff --git a/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback.html b/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback.html
index 9e1a65d0fe7..6cfc23fec58 100644
--- a/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback.html
+++ b/tests/wpt/tests/css/css-fonts/size-adjust-unicode-range-system-fallback.html
@@ -8,7 +8,7 @@
 <style>
 @font-face {
   font-family: large-font;
-  src: local(Ahem), url(/fonts/ahem.ttf);
+  src: local(Ahem), url(/fonts/Ahem.ttf);
   size-adjust: 1000%;
   unicode-range: U+0020;
 }
diff --git a/tests/wpt/tests/css/css-fonts/size-adjust.tentative.html b/tests/wpt/tests/css/css-fonts/size-adjust.tentative.html
index 9b29610c058..22517f39416 100644
--- a/tests/wpt/tests/css/css-fonts/size-adjust.tentative.html
+++ b/tests/wpt/tests/css/css-fonts/size-adjust.tentative.html
@@ -39,7 +39,7 @@
 </div>
 
 <p>In a text node with multiple fonts, size-adjust should only scale characters in the modified font. In the test case below, digits should be scaled, but not letters.</p>
-<div class="target">
+<div class="target" style="height: 30px">
   123xxx
 </div>
 
@@ -52,6 +52,6 @@
 </div>
 
 <p>The computed 'font-size' value (i.e., 'em') should not be affected. But 'ex' should be scaled since it's measured from the actual glyph.</p>
-<div class="target">
+<div class="target" style="line-height: 1">
   <span class="square" style="--l: 1em"></span><span class="square" style="--l: 1ex"></span>
 </div>
diff --git a/tests/wpt/tests/css/css-fonts/variations/font-style-parsing.html b/tests/wpt/tests/css/css-fonts/variations/font-style-parsing.html
index 57384eaba33..8a9ad50b931 100644
--- a/tests/wpt/tests/css/css-fonts/variations/font-style-parsing.html
+++ b/tests/wpt/tests/css/css-fonts/variations/font-style-parsing.html
@@ -16,7 +16,7 @@
             { style: "oblique",                     expectedResult: true,   message: "'oblique' is valid" },
             { style: "oblique 0deg",                expectedResult: true,   message: "'oblique' followed by zero degrees is valid" },
             { style: "oblique 20deg",               expectedResult: true,   message: "'oblique' followed by positive angle in degrees is valid" },
-            { style: "oblique 0.5rad",              expectedResult: true,   message: "'oblique' followed by positive angle in radians is valid",    expectedValue: "oblique 28.6479deg" },
+            { style: "oblique 0.5rad",              expectedResult: true,   message: "'oblique' followed by positive angle in radians is valid",    expectedValue: /^oblique 28\.64\d*deg$/ },
             { style: "oblique 20grad",              expectedResult: true,   message: "'oblique' followed by positive angle in gradians is valid",   expectedValue: "oblique 18deg" },
             { style: "oblique 0.1turn",             expectedResult: true,   message: "'oblique' followed by positive angle in turns is valid",      expectedValue: "oblique 36deg" },
             { style: "oblique 20px",                expectedResult: false,  message: "'oblique' followed by number with invalid unit type is in valid" },
@@ -50,8 +50,10 @@
                 test(() => {
                     let element = document.getElementById("test");
                     element.style = "font-style: " + testCase.style;
-                    let expectedValue = (testCase.expectedValue) ? testCase.expectedValue : testCase.style;
-                    assert_equals(window.getComputedStyle(element).fontStyle, expectedValue, "Font-style computed style: " + testCase.message);
+                    let actualValue = getComputedStyle(element).fontStyle;
+                    let expectedValue = testCase.expectedValue ?? testCase.style;
+                    let assert_fn = expectedValue instanceof RegExp ? assert_regexp_match : assert_equals;
+                    assert_fn(actualValue, expectedValue, "Font-style computed style: " + testCase.message);
                 }, "Font-style (computed): " + testCase.message);
             }
         });
diff --git a/tests/wpt/tests/css/css-grid/grid-layout-properties.html b/tests/wpt/tests/css/css-grid/grid-layout-properties.html
index 4ffa89bce52..8452334b6a1 100644
--- a/tests/wpt/tests/css/css-grid/grid-layout-properties.html
+++ b/tests/wpt/tests/css/css-grid/grid-layout-properties.html
@@ -115,8 +115,8 @@
         'none': ['', '50px 50px 50px / 150px'],
         '<grid-template-rows> / <grid-template-columns>': ['100px 100px / 200px 200px', '100px 100px / 200px 200px'],
         '<line-names>': ['[a] auto [b] auto [c] / [d] auto [e] auto [f]', '[a] auto [b] auto [c] / [d] auto [e] auto [f]'],
-        '<string>+': ['"a b" "a b"', '"a b" "a b"'],
-        '<string><track-size>+': ['100px / "a b" 50px', '100px / "a b" 50px'],
+        '<string>+': ['"a b" "a b" / 50px 50px', '"a b" "a b" / 50px 50px'],
+        '<string><track-size>+': ['"a b" 100px / 50px', '"a b" 100px / 50px'],
         'reset': ['', '50px 50px 50px / 150px'],
       },
       'grid-auto-columns': {
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
index f89217c68e0..6708e583328 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002a.html
@@ -23,13 +23,13 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
   padding-block-start: 1px;
   margin-left: 1px;
   border:1px solid;
-  align-tracks: end;
-  justify-tracks: end;
   masonry-auto-flow: next;
   height: 100px;
   width: 100px;
 }
 .c { grid: repeat(4, auto) / masonry; }
+.ae { align-content: end; }
+.je { justify-content: end; }
 
 span {
   text-decoration: underline lime;
@@ -66,19 +66,19 @@ span:nth-child(4) { font-size:30px; }
 </head>
 <body>
 
-<div class="grid"><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span></div>
-<div class="grid"><span class="fb hl pbe">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span></div>
-<div class="grid vll central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid vll central"><span class="fb pbs">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid vlr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae"><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span></div>
+<div class="grid ae"><span class="fb hl pbe">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span><span class="fb hl">F<br><x>x</x></span></div>
+<div class="grid ae vll central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae vll central"><span class="fb pbs">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae vlr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
 
 <br clear="all">
 
-<div class="grid vrr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid vrr central"><span class="fb pbe">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid vrl central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid swl central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
-<div class="grid swr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae vrr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae vrr central"><span class="fb pbe">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae vrl central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae swl central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
+<div class="grid ae swr central"><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span><span class="fb">F<br><x>x</x></span></div>
 
 <br clear="all">
 
@@ -93,13 +93,13 @@ span:nth-child(4) { font-size:30px; }
 <div class="grid vrl central"><span class="lb pbe"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span></div>
 <div class="grid swl"><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span></div>
 <div class="grid swr"><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span><span class="lb"><x>x</x><br>L</span></div>
-<div class="grid c central"><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span></div>
-<div class="grid c central"><span class="jfb vll pbe">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span></div>
+<div class="grid je c central"><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span></div>
+<div class="grid je c central"><span class="jfb vll pbe">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span><span class="jfb vll">F<br><x>x</x></span></div>
 
 <br clear="all">
 
-<div class="grid c vll"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
-<div class="grid c vll"><span class="jfb hl pbs">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c vll"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c vll"><span class="jfb hl pbs">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
 
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
index eae435707d2..34911b7c9fa 100644
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
+++ b/tests/wpt/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-self-baseline-002b.html
@@ -23,13 +23,13 @@ body { width:600px; height:600px; border:1px solid; box-sizing:border-box; }
   padding-block-start: 1px;
   margin-left: 1px;
   border:1px solid;
-  align-tracks: end;
-  justify-tracks: end;
   masonry-auto-flow: next;
   height: 100px;
   width: 100px;
 }
 .c { grid: repeat(4, auto) / masonry; }
+.ae { align-content: end; }
+.je { justify-content: end; }
 
 span {
   text-decoration: underline lime;
@@ -67,13 +67,13 @@ span:nth-child(4) { font-size:30px; }
 <body>
 
 <!-- TODO: baseline alignment is wrong (bug 1633610)
-<div class="grid c vrr"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
-<div class="grid c vrr"><span class="jfb hl pbe">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
-<div class="grid c swl"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c vrr"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c vrr"><span class="jfb hl pbe">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c swl"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
 -->
-<div class="grid c swr"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
+<div class="grid je c swr"><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span><span class="jfb hl">F<br><x>x</x></span></div>
 
-<div class="grid"><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span></div>
+<div class="grid ae"><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span><span class="lb hl"><x>x</x><br>L</span></div>
 
 <br clear="all">
 
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004-ref.html
deleted file mode 100644
index 10246dac421..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004-ref.html
+++ /dev/null
@@ -1,114 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / auto;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-x {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-y {
-  background: blue;
-  width: 35px;
-}
-z {
-  background: gray;
-  width: 40px;
-}
-masonry-track {
-  display: grid;
-  justify-content: end;
-  column-gap: 5px;
-}
-</style>
-</head>
-<body>
-<wrapper style="display:none">
-<div class="columns" style="height:90px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:68px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:48px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:38px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:28px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:18px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-</wrapper>
-
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let grids = document.querySelectorAll(".grid");
-for (let e of grids) {
-  for (let track of e.children) {
-    track.style.gridTemplateColumns = "repeat(" + track.children.length + ",auto)";
-  }
-}
-wrapper.style.display="";
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004.html
deleted file mode 100644
index ddfc1bb331f..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-004.html
+++ /dev/null
@@ -1,77 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-fragmentation-004-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / masonry;
-  justify-tracks: end;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-.grid > * {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-.grid > :nth-child(4n) {
-  background: blue;
-  width: 35px;
-}
-.grid > :nth-child(3n) {
-  background: gray;
-  width: 40px;
-}
-</style>
-</head>
-<body>
-<wrapper style="display:none">
-<div style="display:none">
-<div class="columns">
-  <div class="grid">
-    <x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x>
-  </div>
-</div>
-</div>
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let tmplt = document.querySelectorAll(".columns")[0];
-let heights = [ 90, 68, 48, 38, 28, 18 ];
-for (let h of heights) {
-  let e = tmplt.cloneNode(true);
-  e.style.height = h + "px";
-  wrapper.appendChild(e);
-}
-wrapper.style.display="";
-</script>
-</wrapper>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005-ref.html
deleted file mode 100644
index e059f414dc7..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005-ref.html
+++ /dev/null
@@ -1,114 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / auto;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-x {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-y {
-  background: blue;
-  width: 35px;
-}
-z {
-  background: gray;
-  width: 40px;
-}
-masonry-track {
-  display: grid;
-  justify-content: space-between;
-  column-gap: 5px;
-}
-</style>
-</head>
-<body>
-<wrapper style="display:none">
-<div class="columns" style="height:90px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:68px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:48px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:38px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:28px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:18px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-</wrapper>
-
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let grids = document.querySelectorAll(".grid");
-for (let e of grids) {
-  for (let track of e.children) {
-    track.style.gridTemplateColumns = "repeat(" + track.children.length + ",auto)";
-  }
-}
-wrapper.style.display="";
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005.html
deleted file mode 100644
index 8315b8f2b55..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-005.html
+++ /dev/null
@@ -1,77 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-fragmentation-005-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / masonry;
-  justify-tracks: space-between;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-.grid > * {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-.grid > :nth-child(4n) {
-  background: blue;
-  width: 35px;
-}
-.grid > :nth-child(3n) {
-  background: gray;
-  width: 40px;
-}
-</style>
-</head>
-<body>
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-<div style="display:none">
-<div class="columns">
-  <div class="grid">
-    <x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x>
-  </div>
-</div>
-</div>
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let tmplt = document.querySelectorAll(".columns")[0];
-let heights = [ 90, 68, 48, 38, 28, 18 ];
-for (let h of heights) {
-  let e = tmplt.cloneNode(true);
-  e.style.height = h + "px";
-  wrapper.appendChild(e);
-}
-wrapper.style.display="";
-</script>
-</wrapper>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006-ref.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006-ref.html
deleted file mode 100644
index 5df37376190..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006-ref.html
+++ /dev/null
@@ -1,118 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>Reference: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / auto;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-x {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-y {
-  background: blue;
-  width: 35px;
-}
-z {
-  background: gray;
-  width: 40px;
-}
-masonry-track {
-  display: grid;
-  justify-content: stretch;
-  column-gap: 5px;
-}
-</style>
-</head>
-<body>
-<wrapper style="display:none">
-<div class="columns" style="height:90px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:68px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:48px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:38px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:28px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-<div class="columns" style="height:18px">
-  <div class="grid">
-    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
-    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
-    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
-  </div>
-</div>
-</wrapper>
-
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let grids = document.querySelectorAll(".grid");
-for (let e of grids) {
-  for (let track of e.children) {
-    var cols = "";
-    for (let item of track.children) {
-      if (item.tagName != "X") cols += "min-content "; else  cols += "auto ";
-    }
-    track.style.gridTemplateColumns = cols;
-  }
-}
-wrapper.style.display="";
-</script>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006.html b/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006.html
deleted file mode 100644
index 9dab0ddc9b6..00000000000
--- a/tests/wpt/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-006.html
+++ /dev/null
@@ -1,77 +0,0 @@
-<!DOCTYPE HTML>
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<html><head>
-  <meta charset="utf-8">
-  <title>CSS Grid Test: Grid axis fragmentation with column masonry layout</title>
-  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
-  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
-  <link rel="match" href="masonry-fragmentation-006-ref.html">
-  <style>
-html,body {
-  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
-}
-wrapper {
-  display: block;
-  width: 600px;
-  height: 600px;
-  overflow: hidden;
-}
-
-.columns {
-  columns: 3;
-  column-fill: auto;
-  background: lightgrey;
-  margin-bottom: 15px;
-}
-
-.grid {
-  display: grid;
-  grid: 20px auto 30px / masonry;
-  justify-tracks: stretch;
-  border: solid;
-  border-width: 3px 1px 7px 5px;
-  padding: 1px 3px 5px 7px;
-  gap: 1px 5px;
-}
-
-.grid > * {
-  background: cyan;
-  min-width: 20px;
-  min-height: 10px;
-}
-.grid > :nth-child(4n) {
-  background: blue;
-  width: 35px;
-}
-.grid > :nth-child(3n) {
-  background: gray;
-  width: 40px;
-}
-</style>
-</head>
-<body>
-<wrapper style="display:none">
-<div style="display:none">
-<div class="columns">
-  <div class="grid">
-    <x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x><x></x>
-  </div>
-</div>
-</div>
-<script>
-let wrapper = document.querySelectorAll("wrapper")[0];
-let tmplt = document.querySelectorAll(".columns")[0];
-let heights = [ 90, 68, 48, 38, 28, 18 ];
-for (let h of heights) {
-  let e = tmplt.cloneNode(true);
-  e.style.height = h + "px";
-  wrapper.appendChild(e);
-}
-wrapper.style.display="";
-</script>
-</wrapper>
-</body>
-</html>
diff --git a/tests/wpt/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html b/tests/wpt/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html
index f8fa0ab81b9..20e7a30cce4 100644
--- a/tests/wpt/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html
+++ b/tests/wpt/tests/css/css-grid/subgrid/orthogonal-writing-mode-005-ref.html
@@ -250,37 +250,37 @@
   <!-- Named grid areas -->
   <div class="grid"><div class="subgrid areas-1a"><div class="subgrid">
     <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:2"></div>
+    <div style="grid-row:1 / -1"></div>
+    <div style="grid-row:1 / -1"></div>
+    <div style="grid-row:-1"></div>
   </div></div></div>
 
   <div class="grid"><div class="subgrid areas-1b"><div class="subgrid">
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
     <div style="grid-row:2"></div>
+    <div style="grid-row:2 / -1"></div>
+    <div style="grid-row:2 / -1"></div>
+    <div style="grid-row:-1"></div>
   </div></div></div>
 
   <div class="grid"><div class="subgrid areas-1c"><div class="subgrid">
     <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:2"></div>
+    <div style="grid-row:1/-2"></div>
+    <div style="grid-row:1/-2"></div>
+    <div style="grid-row:-2"></div>
   </div></div></div>
 
   <div class="grid"><div class="subgrid areas-1d"><div class="subgrid">
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:2"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3 / -1"></div>
+    <div style="grid-row:3 / -1"></div>
+    <div style="grid-row:-1"></div>
   </div></div></div>
 
   <div class="grid"><div class="subgrid areas-1e"><div class="subgrid">
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:1"></div>
-    <div style="grid-row:2"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:3"></div>
+    <div style="grid-row:-1"></div>
   </div></div></div>
   </body>
   </html>
diff --git a/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001-ref.html b/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001-ref.html
new file mode 100644
index 00000000000..b46c679c9f4
--- /dev/null
+++ b/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001-ref.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<link rel="stylesheet" href="../../css-pseudo/support/highlights.css">
+<meta charset="utf-8">
+<style>
+    :root {
+        writing-mode: vertical-rl;
+    }
+
+    .highlighted {
+      background-color: yellow;
+      color: blue;
+    }
+</style>
+<body>
+<div class="highlight_reftest"><span class="highlighted">One two </span><span>three…</span></div>
diff --git a/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001.html b/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001.html
new file mode 100644
index 00000000000..9fe2bdcd5f1
--- /dev/null
+++ b/tests/wpt/tests/css/css-highlight-api/painting/custom-highlight-painting-vertical-writing-mode-001.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>CSS Highlight API Test: Vertical Writing Mode</title>
+<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
+<link rel="match" href="custom-highlight-painting-vertical-writing-mode-001-ref.html">
+<link rel="stylesheet" href="../../css-pseudo/support/highlights.css">
+<meta name="assert" value="::highlight overlay is painted correctly when the highlighted text is in a vertical writing mode">
+<style>
+  :root {
+      writing-mode: vertical-rl;
+  }
+  ::highlight(example-highlight) {
+    background-color: yellow;
+    color: blue;
+  }
+</style>
+<body>
+<div class="highlight_reftest"><span>One </span><span>two </span><span>three…</span></div>
+<script>
+  let r = new Range();
+  r.setStart(document.querySelector("div"), 0);
+  r.setEnd(document.querySelector("div"), 2);
+
+  CSS.highlights.set("example-highlight", new Highlight(r));
+</script>
diff --git a/tests/wpt/tests/css/css-lists/dynamic-counters-crash.html b/tests/wpt/tests/css/css-lists/dynamic-counters-crash.html
new file mode 100644
index 00000000000..41e98ce0037
--- /dev/null
+++ b/tests/wpt/tests/css/css-lists/dynamic-counters-crash.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="help" href="http://crbug.com/1492599">
+<style type="text/css">
+.c0:nth-last-child(odd) { counter-reset: counter; }
+.c1:nth-last-child(even) { counter-reset: counter; }
+.c1 + .c13 { counter-increment: counter -1; }
+.c10[class~="c10"] { counter-reset: counter; }
+</style>
+<script type="text/javascript">
+var nodes = Array();
+function boom() {
+ nodes[16] = document.createElement('em');
+ nodes[16].setAttribute('class', 'c0');
+ document.documentElement.appendChild(nodes[16]);
+ nodes[18] = document.createElement('colgroup');
+ nodes[52] = document.createElement('table');
+ document.documentElement.appendChild(nodes[52]);
+ nodes[53] = document.createElement('abbr');
+ nodes[53].setAttribute('class', 'c1');
+ document.documentElement.appendChild(nodes[53]);
+ nodes[54] = document.createElement('source');
+ nodes[54].setAttribute('class', 'c10');
+ nodes[55] = document.createElement('hgroup');
+ nodes[55].setAttribute('class', 'c13');
+ document.documentElement.appendChild(nodes[55]);
+ nodes[66] = document.createElement('img');
+ document.documentElement.appendChild(nodes[66]);
+ nodes[71] = document.createElement('samp');
+ document.documentElement.appendChild(nodes[71]);
+ nodes[97] = document.createElement('del');
+ document.documentElement.appendChild(nodes[97]);
+ nodes[52].appendChild(nodes[54]);
+ setTimeout('try { nodes[18].appendChild(nodes[71]); } catch(e) {}');
+ document.documentElement.classList.remove("reftest-wait");
+}
+window.onload = boom;
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/clip-path-svg-content/clip-path-invalid-reference.svg b/tests/wpt/tests/css/css-masking/clip-path-svg-content/clip-path-invalid-reference.svg
new file mode 100644
index 00000000000..714d90ee767
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/clip-path-svg-content/clip-path-invalid-reference.svg
@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
+<g id="testmeta">
+	<title>CSS Masking: clipPath with invalid reference</title>
+	<html:link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-clip-path"/>
+	<html:link rel="match" href="reference/clip-path-green-square-001-ref.svg" />
+	<metadata class="flags">svg</metadata>
+	<desc class="assert">clip-paths are ignored if their
+        reference doesn't point to a clipPath.</desc>
+</g>
+  <linearGradient id="a" />
+  <rect x="50" y="50" width="100" height="100" fill="green" clip-path="url(#a)"/>
+</svg>
+
diff --git a/tests/wpt/tests/css/css-masking/clip-path-svg-content/reference/clip-path-green-square-001-ref.svg b/tests/wpt/tests/css/css-masking/clip-path-svg-content/reference/clip-path-green-square-001-ref.svg
new file mode 100644
index 00000000000..c83ec87e7bd
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/clip-path-svg-content/reference/clip-path-green-square-001-ref.svg
@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
+<g id="testmeta">
+	<title>CSS Masking: Reftest reference</title>
+	<html:link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com"/>
+	<metadata class="flags">svg</metadata>
+</g>
+<rect x="50" y="50" width="100" height="100" fill="green"/>
+</svg>
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-filter.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-filter.html
index 0ba7a0021da..a9809cbc30b 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-filter.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-filter.html
@@ -9,14 +9,7 @@
   height: 100px;
   background-color: green;
   filter: blur(5px);
-  /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-  animation: clippath 1000000s cubic-bezier(0,1,1,0) -500000s;
+  animation: clippath 20s steps(2, jump-end) -9.999s;
 }
 @keyframes clippath {
   0%   { clip-path: circle(50% at 50% 50%); }
@@ -24,13 +17,12 @@
 }
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 <body>
 <div class="container"></div>
 
 <script>
-document.getAnimations()[0].ready.then(() => {
-  takeScreenshot();
-});
+ waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position-rounding-error.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position-rounding-error.html
index 12d984b32a2..8a02a5b2a6d 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position-rounding-error.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position-rounding-error.html
@@ -11,14 +11,7 @@
 <style>
   .container {
     background-color: green;
-    /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-    animation: clippath 1000000s cubic-bezier(0, 1, 1, 0) -500000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
     position: fixed;
     width: 70px;
     height: 126px;
@@ -33,15 +26,14 @@
       clip-path: inset(10% 10%);
     }
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <div class="container"></div>
-
   <script>
-    document.getAnimations()[0].ready.then(takeScreenshot);
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position.html
index a9f278d8837..3ffc2a30a7f 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fixed-position.html
@@ -15,14 +15,7 @@
     top: 100px;
     left: 100px;
     background-color: green;
-    /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-    animation: clippath 1000000s cubic-bezier(0, 1, 1, 0) -500000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
   }
 
   .big {
@@ -42,9 +35,9 @@
       clip-path: circle(350% at 20% 20%);
     }
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <div class="container">
@@ -52,7 +45,7 @@
   </div>
 
   <script>
-    document.getAnimations()[0].ready.then(takeScreenshot);
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fragmented.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fragmented.html
index 470a2788cce..9f68c238faf 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fragmented.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-fragmented.html
@@ -21,12 +21,12 @@
 
   .inner {
     background-color: blue;
-    animation: clippath 1000000s cubic-bezier(0, 1, 1, 0) -500000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
     height: 100px;
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <div class="outer">
@@ -35,7 +35,7 @@
   </div>
 
   <script>
-    takeScreenshot();
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-none.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-none.html
index 73b8a473354..3efb593b72b 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-none.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-none.html
@@ -19,7 +19,7 @@
   }
 
   .target {
-    animation: clippath 100000s infinite -50000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
     background-color: blue;
     width: 100px;
     height: 100px;
@@ -39,15 +39,14 @@
   }
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <div class="target">
     <div class="outofbounds"></div>
   </div>
   <script>
-    document.getAnimations()[0].ready.then(() => {
-      takeScreenshot();
-    });
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-overflow.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-overflow.html
index 09a44fb3aac..fc8c78efbf6 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-overflow.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-overflow.html
@@ -9,14 +9,7 @@
   height: 200px;
   background-color: green;
   border: 20px solid black;
-  /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-  animation: clippath 1000000s cubic-bezier(0,1,1,0) -500000s;
+  animation: clippath 20s steps(2, jump-end) -9.999s;
 }
 @keyframes clippath {
   0%   { clip-path: circle(130px at 130px 130px); }
@@ -24,13 +17,12 @@
 }
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 <body>
 <div class="container"><div class="container"></div></div>
 
 <script>
-document.getAnimations()[0].ready.then(() => {
-  takeScreenshot();
-});
+  waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
 </script>
 </body>
 </html>
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg-zoom.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg-zoom.html
index c79c098c622..f7be6d25324 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg-zoom.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg-zoom.html
@@ -8,14 +8,7 @@
     stroke: black;
     stroke-width: 3;
     fill: red;
-    /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-    animation: clippath 1000000s cubic-bezier(0, 1, 1, 0) -500000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
   }
 
   .svg {
@@ -33,9 +26,9 @@
       clip-path: circle(20% at 50% 50%);
     }
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <svg class="svg">
@@ -43,7 +36,7 @@
   </svg>
 
   <script>
-    document.getAnimations()[0].ready.then(takeScreenshot);
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg.html
index 676fe5ee578..5318355585c 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-svg.html
@@ -8,14 +8,7 @@
     stroke: black;
     stroke-width: 3;
     fill: red;
-    /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-    animation: clippath 1000000s cubic-bezier(0, 1, 1, 0) -500000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
   }
 
   .svg {
@@ -32,9 +25,9 @@
       clip-path: circle(20% at 50% 50%);
     }
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <svg class="svg">
@@ -42,7 +35,7 @@
   </svg>
 
   <script>
-    document.getAnimations()[0].ready.then(takeScreenshot());
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-zoom.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-zoom.html
index 5573318a516..89641240f67 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-zoom.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation-zoom.html
@@ -8,14 +8,7 @@
     height: 80px;
     background-color: green;
     zoom: 1.25;
-    /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-    animation: clippath 10000000s cubic-bezier(0, 1, 1, 0) -5000000s;
+    animation: clippath 20s steps(2, jump-end) -9.999s;
   }
 
   @keyframes clippath {
@@ -27,15 +20,15 @@
       clip-path: circle(20% at 20% 20%);
     }
   }
-
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
 <body>
   <div class="container"></div>
 
   <script>
-    document.getAnimations()[0].ready.then(takeScreenshot);
+    waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
   </script>
 </body>
 
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation.html
index cea2ebc7c0c..307d972ef63 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-animation.html
@@ -7,14 +7,7 @@
   width: 100px;
   height: 100px;
   background-color: green;
-  /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-  animation: clippath 1000000s cubic-bezier(0,1,1,0) -500000s;
+  animation: clippath 20s steps(2, jump-end) -9.999s;
 }
 @keyframes clippath {
   0%   { clip-path: circle(50% at 50% 50%); }
@@ -22,13 +15,12 @@
 }
 </style>
 <script src="/common/reftest-wait.js"></script>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 <body>
 <div class="container"></div>
 
 <script>
-document.getAnimations()[0].ready.then(() => {
-  takeScreenshot();
-});
+  waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
 </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-transition.html b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-transition.html
index 16f4de3a1b3..980f7a53e2e 100644
--- a/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-transition.html
+++ b/tests/wpt/tests/css/css-masking/clip-path/animations/clip-path-transition.html
@@ -3,38 +3,32 @@
 <link rel="help" href="https://drafts.csswg.org/css-shapes-1/#basic-shape-interpolation">
 <link rel="match" href="clip-path-transition-ref.html">
 <style>
-.container {
-  width: 100px;
-  height: 100px;
-  clip-path: circle(50% at 50% 50%);
-  background-color: green;
-  transition-property: clip-path;
-  /* Use a long animation that start at 50% progress where the slope of the
-     selected timing function is zero. By setting up the animation in this way,
-     we accommodate lengthy delays in running the test without a potential drift
-     in the animated property value. This is important for avoiding flakes,
-     especially on debug builds. The screenshots are taken as soon as the
-     animation is ready, thus the long animation duration has no bearing on
-     the actual duration of the test. */
-  transition-duration: 1000000s;
-  transition-timing-function: cubic-bezier(0,1,1,0);
-  transition-delay: -500000s;
-}
+  .container {
+    width: 100px;
+    height: 100px;
+    clip-path: circle(50% at 50% 50%);
+    background-color: green;
+    transition-property: clip-path;
+    transition-duration: 20s;
+    transition-timing-function: steps(2, jump-end);
+    transition-delay: -9.999s;
+  }
 </style>
 <script src="/common/reftest-wait.js"></script>
-<body>
-<div class="container" id="target"></div>
+<script src="../../../../web-animations/resources/timing-utils.js"></script>
 
-<script>
-function update() {
-  document.getElementById('target').style.clipPath = "circle(30% at 30% 30%)";
-  requestAnimationFrame(() => {
-    takeScreenshot();
-  });
-}
-requestAnimationFrame(function() {
-  requestAnimationFrame(update);
-});
-</script>
+<body>
+  <div class="container" id="target"></div>
+
+  <script>
+    function update() {
+      document.getElementById('target').style.clipPath = "circle(30% at 30% 30%)";
+      waitForAnimationTime(document.getAnimations()[0], 1).then(takeScreenshot);
+    }
+    requestAnimationFrame(function () {
+      requestAnimationFrame(update);
+    });
+  </script>
 </body>
+
 </html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-2.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-2.html
index 2953723ea21..2093b073dc2 100644
--- a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-2.html
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-2.html
@@ -36,8 +36,8 @@
     </style>
   </head>
   <body>
-    <svg width="200" height="200" viewBox="100 100 100 100" preserveAspectRatio="none" style="left: 10px;">
-      <rect class="view mask" x="110" y="110" width="50" height="100"/>
+    <svg width="200" height="200" viewBox="0 0 100 100" preserveAspectRatio="none" style="left: 10px;">
+      <rect class="view mask" x="10" y="10" width="50" height="100"/>
     </svg>
     <svg width="200" height="200" style="left: 220px;">
       <rect class="fill mask" x="50" y="50" width="150" height="150"/>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3-ref.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3-ref.html
new file mode 100644
index 00000000000..08fdf2e9928
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3-ref.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS mask-clip reference</title>
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      div {
+        position: absolute;
+        top: 10px;
+        background-color: purple;
+      }
+
+      div.border {
+        left: 10px;
+        margin: 1px 4px;
+        width: 60px;
+        height: 25px;
+      }
+
+      div.border2 {
+        left: 110px;
+        margin: 1px 4px;
+        width: 60px;
+        height: 25px;
+      }
+
+      div.content {
+        left: 210px;
+        margin: 15px 13px;
+        width: 40px;
+        height: 11px;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="color border"></div>
+    <div class="color border2"></div>
+    <div class="color content"></div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3.html
new file mode 100644
index 00000000000..d79baa3b5e8
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-3.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-clip: clip mask image</title>
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-clip">
+    <link rel="match" href="mask-clip-3-ref.html">
+    <meta name="assert" content="fill-box, stroke-box, view-box of mask-clip should clip to the appropriate boxes.">
+    <style type="text/css">
+      div.outer {
+        /*
+         * content box: 40 x 20
+         * padding box: 52 x 38
+         * border  box: 60 x 50
+         * margin  box: 66 x 54
+         */
+        background-color: purple;
+        position: absolute;
+        top: 10px;
+        margin: 1px 2px 3px 4px;
+        border: solid transparent;
+        border-width: 8px 2px 4px 6px;
+        padding: 6px 9px 12px 3px;
+        width: 40px;
+        height: 20px;
+      }
+
+      div.mask {
+        mask-size: 100% 100%;
+        mask-origin: border-box;
+        mask-image: url(support/transparent-100x50-blue-100x50.svg);
+      }
+
+      div.stroke {
+        left: 10px;
+        mask-clip: stroke-box; /* should be the same as border-box */
+      }
+
+      div.view {
+        left: 110px;
+        mask-clip: view-box; /* should be the same as border-box */
+      }
+
+      div.fill {
+        left: 210px;
+        mask-clip: fill-box; /* should be the same as content-box */
+      }
+    </style>
+  </head>
+  <body>
+    <div class="outer mask stroke"></div>
+    <div class="outer mask view"></div>
+    <div class="outer mask fill"></div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4-ref.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4-ref.html
new file mode 100644
index 00000000000..a1a2898644e
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS mask-clip reference</title>
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <style type="text/css">
+      svg {
+        position: absolute;
+        top: 10px;
+        border: 1px solid black;
+      }
+    </style>
+  </head>
+  <body>
+    <svg width="200" height="200" style="left: 10px;">
+      <rect x="50" y="50" width="50" height="50" fill="blue"/>
+    </svg>
+    <svg width="200" height="200" style="left: 220px;">
+      <rect x="50" y="50" width="50" height="50" fill="blue"/>
+    </svg>
+    <svg width="200" height="200" style="left: 10px; top: 220px;">
+      <rect x="50" y="50" width="50" height="50" fill="green"/>
+      <rect x="60" y="60" width="40" height="40" fill="blue"/>
+    </svg>
+    <svg width="200" height="200" style="left: 220px; top: 220px;">
+      <rect x="50" y="50" width="50" height="50" fill="green"/>
+      <rect x="60" y="60" width="40" height="40" fill="blue"/>
+    </svg>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4.html
new file mode 100644
index 00000000000..133c4890411
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-4.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-clip: clip mask image</title>
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-clip">
+    <link rel="match" href="mask-clip-4-ref.html">
+    <meta name="assert" content="content-box, padding-box, border-box, and
+      magrin-box values of mask-clip should clip to the appropriate boxes.">
+    <style type="text/css">
+      svg {
+        position: absolute;
+        top: 10px;
+        border: 1px solid black;
+      }
+
+      rect.mask {
+        fill: blue;
+        mask-origin: fill-box;
+        mask-repeat: no-repeat;
+        mask-image: url(support/50x50-opaque-blue.svg);
+      }
+
+      rect.content {
+        mask-clip: content-box; /* should be the same as fill-box */
+      }
+
+      rect.padding {
+        mask-clip: padding-box; /* should be the same as fill-box */
+      }
+
+      rect.border {
+        mask-clip: border-box; /* should be the same as stroke-box */
+      }
+
+      rect.margin {
+        mask-clip: margin-box; /* should be the same as stroke-box */
+      }
+    </style>
+  </head>
+  <body>
+    <svg width="200" height="200" style="left: 10px;">
+      <rect class="content mask" x="50" y="50" width="150" height="150"/>
+    </svg>
+    <svg width="200" height="200" style="left: 220px;">
+      <rect class="padding mask" x="50" y="50" width="150" height="150"/>
+    </svg>
+    <svg width="200" height="200" style="left: 10px; top: 220px;">
+      <rect class="border mask" x="50" y="50" width="100" height="100" stroke="green" stroke-width="20"/>
+    </svg>
+    <svg width="200" height="200" style="left: 220px; top: 220px;">
+      <rect class="margin mask" x="50" y="50" width="100" height="100" stroke="green" stroke-width="20"/>
+    </svg>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7-ref.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7-ref.html
new file mode 100644
index 00000000000..f67f74bc8bf
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7-ref.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta content="ahem" name="flags">
+    <link rel="stylesheet" href="/fonts/ahem.css" />
+    <style>
+      div.mask {
+        background-color: purple;
+        width: 40px;
+        height: 20px;
+        border-radius: 5px;
+        position: relative;
+      }
+      span.mask {
+        font: 20px/1 Ahem;
+        line-height: 20px;
+        color: purple;
+        border-radius: 5px;
+        position: relative;
+      }
+      .unclipped-child {
+        position: absolute;
+        top: -6px;
+        left: -6px;
+        width: 52px;
+        height: 32px;
+        background: purple;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="mask"><div class="unclipped-child"></div></div>
+    <br>
+    <span class="mask">XX<span class="unclipped-child"></span></span>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7.html
new file mode 100644
index 00000000000..1c0d8e1dc4a
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-7.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-clip: no-clip should not clip in the presence of border-radius</title>
+    <link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-mask-clip">
+    <link rel="match" href="mask-clip-7-ref.html">
+    <meta name="assert" content="mask-clip: no-clip with border-radius should not clip.">
+    <meta content="ahem" name="flags">
+    <link rel="stylesheet" href="/fonts/ahem.css" />
+    <style>
+      div.mask {
+        mask-image: linear-gradient(black, black);
+        mask-clip: no-clip;
+        background-color: purple;
+        width: 40px;
+        height: 20px;
+        border-radius: 5px;
+        position: relative;
+      }
+      span.mask {
+        font: 20px/1 Ahem;
+        line-height: 20px;
+        mask-image: linear-gradient(black, black);
+        mask-clip: no-clip;
+        color: purple;
+        border-radius: 5px;
+        position: relative;
+      }
+      .unclipped-child {
+        position: absolute;
+        top: -6px;
+        left: -6px;
+        width: 52px;
+        height: 32px;
+        background: purple;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="mask"><div class="unclipped-child"></div></div>
+    <br>
+    <span class="mask">XX<span class="unclipped-child"></span></span>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8-ref.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8-ref.html
new file mode 100644
index 00000000000..d7276bd6644
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8-ref.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <style type="text/css">
+      div.outer {
+        /*
+         * content box: 40 x 20
+         * padding box: 52 x 38
+         * border  box: 60 x 50
+         * margin  box: 66 x 54
+         */
+        background-color: purple;
+        position: absolute;
+        top: 10px;
+        margin: 1px 2px 3px 4px;
+        border: solid transparent;
+        border-width: 8px 2px 4px 6px;
+        padding: 6px 9px 12px 3px;
+        width: 40px;
+        height: 20px;
+        mask-size: 100% 100%;
+        mask-image: url(support/transparent-100x50-blue-100x50.svg);
+      }
+
+      div.first {
+        left: 10px;
+        mask-origin: border-box;
+      }
+
+      div.second {
+        left: 110px;
+        mask-origin: border-box;
+      }
+
+      div.third {
+        left: 210px;
+        mask-origin: content-box;
+      }
+
+    </style>
+  </head>
+  <body>
+    <div class="outer mask first"></div>
+    <div class="outer mask second"></div>
+    <div class="outer mask third"></div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8.html b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8.html
new file mode 100644
index 00000000000..924920ffaca
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-clip-8.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-clip: clip mask image</title>
+    <link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-mask-clip">
+    <link rel="match" href="mask-clip-8-ref.html">
+    <meta name="assert" content="Check fall back values for fill-box (:content-box), stroke-box and view-box (:border-box).">
+    <style type="text/css">
+      div.outer {
+        /*
+         * content box: 40 x 20
+         * padding box: 52 x 38
+         * border  box: 60 x 50
+         * margin  box: 66 x 54
+         */
+        background-color: purple;
+        position: absolute;
+        top: 10px;
+        margin: 1px 2px 3px 4px;
+        border: solid transparent;
+        border-width: 8px 2px 4px 6px;
+        padding: 6px 9px 12px 3px;
+        width: 40px;
+        height: 20px;
+        mask-size: 100% 100%;
+        mask-image: url(support/transparent-100x50-blue-100x50.svg);
+      }
+
+      div.first {
+        left: 10px;
+        mask-origin: stroke-box;
+      }
+
+      div.second {
+        left: 110px;
+        mask-origin: view-box;
+      }
+
+      div.third {
+        left: 210px;
+        mask-origin: fill-box;
+      }
+
+    </style>
+  </head>
+  <body>
+    <div class="outer mask first"></div>
+    <div class="outer mask second"></div>
+    <div class="outer mask third"></div>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-image-3-ref.html b/tests/wpt/tests/css/css-masking/mask-image/mask-image-3-ref.html
index ec29e333c71..96b111aaea6 100644
--- a/tests/wpt/tests/css/css-masking/mask-image/mask-image-3-ref.html
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-image-3-ref.html
@@ -5,24 +5,12 @@
     <title>CSS Masking: mask-image: multiple SVG masks</title>
     <link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
     <link rel="author" title="Mozilla" href="https://www.mozilla.org">
-    <svg height="0">
-      <mask id="mask" x="0" y="0" width="1" height="1">
-        <rect x="0" y="0" width="50" height="50" style="stroke:none; fill: #ffffff"/>
-        <circle cx="50" cy="50" r="25" style="stroke:none; fill: #ffffff"/>
-      </mask>
-    </svg>
-    <style type="text/css">
-      div {
-        background-color: purple;
-        mask: url(#mask);
-        width: 100px;
-        height: 100px;
-      }
-    </style>
-
   </head>
-
   <body>
-    <div></div>
+    <br>
+    <svg width="100" height="100">
+      <rect x="0" y="0" width="50" height="50" fill="purple"/>
+      <circle cx="50" cy="50" r="25" fill="purple"/>
+    </svg>
   </body>
 </html>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-image-3a.html b/tests/wpt/tests/css/css-masking/mask-image/mask-image-3a.html
index b3a6d396503..3aae3df3934 100644
--- a/tests/wpt/tests/css/css-masking/mask-image/mask-image-3a.html
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-image-3a.html
@@ -8,6 +8,7 @@
     <link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-image">
     <link rel="match" href="mask-image-3-ref.html">
     <meta name="assert" content="Test checks whether SVG mask as mask layer works correctly or not.">
+    <meta name="fuzzy" content="0-1; 0-100">
     <svg height="0">
       <mask id="mask1" x="0" y="0" width="1" height="1" >
         <rect x="0" y="0" width="50" height="50" style="stroke:none; fill: #ffffff"/>
diff --git a/tests/wpt/tests/css/css-masking/mask-image/mask-origin-3.html b/tests/wpt/tests/css/css-masking/mask-image/mask-origin-3.html
index eade316b3d8..9659d09ba3c 100644
--- a/tests/wpt/tests/css/css-masking/mask-image/mask-origin-3.html
+++ b/tests/wpt/tests/css/css-masking/mask-image/mask-origin-3.html
@@ -39,8 +39,8 @@
     </style>
   </head>
   <body>
-    <svg width="200" height="200" viewBox="100 100 100 100" preserveAspectRatio="none" style="left: 10px;">
-      <rect class="view mask" x="125" y="125" width="100" height="100"/>
+    <svg width="200" height="200" viewBox="0 0 100 100" preserveAspectRatio="none" style="left: 10px;">
+      <rect class="view mask" x="25" y="25" width="100" height="100"/>
     </svg>
     <svg width="200" height="200" style="left: 240px;">
       <rect class="fill mask" x="50" y="50" width="80" height="80" stroke="green" stroke-width="20"/>
diff --git a/tests/wpt/tests/css/css-masking/mask-svg-content/mask-invalid-reference.svg b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-invalid-reference.svg
new file mode 100644
index 00000000000..3d68fc0d745
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-invalid-reference.svg
@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
+<g id="testmeta">
+	<title>CSS Masking: mask with invalid reference</title>
+	<html:link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-mask-image"/>
+	<html:link rel="match" href="reference/mask-green-square-001-ref.svg" />
+	<metadata class="flags">svg</metadata>
+	<desc class="assert">masks are ignored if their
+        reference doesn't point to a mask element.</desc>
+</g>
+  <linearGradient id="a" />
+  <rect x="50" y="50" width="100" height="100" fill="green" mask="url(#a)"/>
+</svg>
+
diff --git a/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter-clipped-to-region.svg b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter-clipped-to-region.svg
new file mode 100644
index 00000000000..3307ce5101d
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter-clipped-to-region.svg
@@ -0,0 +1,26 @@
+<svg id="svg-root"
+  width="200" height="200"
+  xmlns="http://www.w3.org/2000/svg"
+  xmlns:html="http://www.w3.org/1999/xhtml">
+  <g id="testmeta">
+    <title>filter applied to element in mask, clipped by filter region</title>
+    <html:link rel="help" href="https://www.w3.org/TR/css-masking-1"/>
+    <html:link rel="match" href="reference/mask-green-square-001-ref.svg" />
+  </g>
+  <defs>
+    <filter id="filter" x="0" y="0" width="1" height="1">
+      <feGaussianBlur stdDeviation="0.001"/>
+    </filter>
+
+    <mask id="maskFill" maskContentUnits="userSpaceOnUse">
+      <rect x="25" y="25" width="50" height="50" stroke-width="50" fill="none"
+            stroke="white" filter="url(#filter)"/>
+      <rect x="25" y="25" width="50" height="50" fill="black"/>
+    </mask>
+  </defs>
+
+  <g transform="translate(50, 50)">
+    <rect width="100" height="100" fill="green" />
+    <rect width="100" height="100" mask="url(#maskFill)" fill="red"/>
+  </g>
+</svg>
diff --git a/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter.svg b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter.svg
index a6028a398ea..aaa383983fd 100644
--- a/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter.svg
+++ b/tests/wpt/tests/css/css-masking/mask-svg-content/mask-with-filter.svg
@@ -8,7 +8,9 @@
     <html:link rel="match" href="reference/mask-green-square-001-ref.svg" />
   </g>
   <defs>
-    <filter id="filter"><feGaussianBlur stdDeviation="0.001"/></filter>
+    <filter id="filter" filterUnits="userSpaceOnUse">
+      <feGaussianBlur stdDeviation="0.001"/>
+    </filter>
 
     <mask id="maskFill" maskContentUnits="userSpaceOnUse">
       <rect width="100%" height="100%" fill="white"/>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-composite-computed.html b/tests/wpt/tests/css/css-masking/parsing/mask-composite-computed.html
new file mode 100644
index 00000000000..d2b9a4a606a
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-composite-computed.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: getComputedStyle().maskComposite</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-composite">
+<meta name="assert" content="mask-composite computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("mask-composite", "add");
+test_computed_value("mask-composite", "subtract");
+test_computed_value("mask-composite", "intersect");
+test_computed_value("mask-composite", "exclude");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-composite-invalid.html b/tests/wpt/tests/css/css-masking/parsing/mask-composite-invalid.html
new file mode 100644
index 00000000000..9dc4df163c7
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-composite-invalid.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: parsing mask-composite with invalid values</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-composite">
+<meta name="assert" content="mask-composite supports only the grammar '<compositing-operator>#'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("mask-composite", "auto");
+test_invalid_value("mask-composite", "add subtract");
+test_invalid_value("mask-composite", "clear");
+test_invalid_value("mask-composite", "copy");
+test_invalid_value("mask-composite", "source-over");
+test_invalid_value("mask-composite", "source-in");
+test_invalid_value("mask-composite", "source-out");
+test_invalid_value("mask-composite", "source-atop");
+test_invalid_value("mask-composite", "destination-over");
+test_invalid_value("mask-composite", "destination-in");
+test_invalid_value("mask-composite", "destination-out");
+test_invalid_value("mask-composite", "destination-atop");
+test_invalid_value("mask-composite", "xor");
+test_invalid_value("mask-composite", "plus-lighter");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-composite-valid.html b/tests/wpt/tests/css/css-masking/parsing/mask-composite-valid.html
new file mode 100644
index 00000000000..385726c17ad
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-composite-valid.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: parsing mask-composite with valid values</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-composite">
+<meta name="assert" content="mask-composite supports the full grammar '<compositing-operator>#'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("mask-composite", "add");
+test_valid_value("mask-composite", "subtract");
+test_valid_value("mask-composite", "intersect");
+test_valid_value("mask-composite", "exclude");
+test_valid_value("mask-composite", "add, subtract");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-repeat-computed.html b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-computed.html
new file mode 100644
index 00000000000..0ecb9aa573d
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-computed.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: getComputedStyle().maskRepeat</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-repeat">
+<meta name="assert" content="mask-repeat computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+  test_computed_value("mask-repeat", "repeat-x");
+  test_computed_value("mask-repeat", "repeat-y");
+
+  test_computed_value("mask-repeat", "repeat");
+  test_computed_value("mask-repeat", "space");
+  test_computed_value("mask-repeat", "round");
+  test_computed_value("mask-repeat", "no-repeat");
+
+  test_computed_value("mask-repeat", "repeat repeat", "repeat");
+  test_computed_value("mask-repeat", "repeat space");
+  test_computed_value("mask-repeat", "repeat round");
+  test_computed_value("mask-repeat", "repeat no-repeat", "repeat-x");
+
+  test_computed_value("mask-repeat", "space repeat");
+  test_computed_value("mask-repeat", "space space", "space");
+  test_computed_value("mask-repeat", "space round");
+  test_computed_value("mask-repeat", "space no-repeat");
+
+  test_computed_value("mask-repeat", "round repeat");
+  test_computed_value("mask-repeat", "round space");
+  test_computed_value("mask-repeat", "round round", "round");
+  test_computed_value("mask-repeat", "round no-repeat");
+
+  test_computed_value("mask-repeat", "no-repeat repeat", "repeat-y");
+  test_computed_value("mask-repeat", "no-repeat space");
+  test_computed_value("mask-repeat", "no-repeat round");
+  test_computed_value("mask-repeat", "no-repeat no-repeat", "no-repeat");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-repeat-invalid.html b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-invalid.html
new file mode 100644
index 00000000000..8a0f4e892a3
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-invalid.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: parsing mask-repeat with invalid values</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-repeat">
+<meta name="assert" content="mask-repeat supports only the grammar.">
+<!--
+<mask-repeat> = <repeat-style>#
+<repeat-style> = repeat-x | repeat-y | [repeat | space | round | no-repeat]{1,2}
+ -->
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("mask-repeat", "auto");
+test_invalid_value("mask-repeat", "repeat-z");
+test_invalid_value("mask-repeat", "repeat undefined");
+test_invalid_value("mask-repeat", "undefined repeat");
+test_invalid_value("mask-repeat", "repeat; round");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-masking/parsing/mask-repeat-valid.html b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-valid.html
new file mode 100644
index 00000000000..1d75a1bcb2e
--- /dev/null
+++ b/tests/wpt/tests/css/css-masking/parsing/mask-repeat-valid.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: parsing mask-repeat with valid values</title>
+<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-repeat">
+<meta name="assert" content="mask-repeat supports the full grammar.">
+<!--
+<mask-repeat> = <repeat-style>#
+<repeat-style> = repeat-x | repeat-y | [repeat | space | round | no-repeat]{1,2}
+ -->
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("mask-repeat", "repeat-x");
+test_valid_value("mask-repeat", "repeat-y");
+
+test_valid_value("mask-repeat", "repeat");
+test_valid_value("mask-repeat", "space");
+test_valid_value("mask-repeat", "round");
+test_valid_value("mask-repeat", "no-repeat");
+
+test_valid_value("mask-repeat", "repeat repeat", "repeat");
+test_valid_value("mask-repeat", "repeat space");
+test_valid_value("mask-repeat", "repeat round");
+test_valid_value("mask-repeat", "repeat no-repeat", "repeat-x");
+
+test_valid_value("mask-repeat", "space repeat");
+test_valid_value("mask-repeat", "space space", "space");
+test_valid_value("mask-repeat", "space round");
+test_valid_value("mask-repeat", "space no-repeat");
+
+test_valid_value("mask-repeat", "round repeat");
+test_valid_value("mask-repeat", "round space");
+test_valid_value("mask-repeat", "round round", "round");
+test_valid_value("mask-repeat", "round no-repeat");
+
+test_valid_value("mask-repeat", "no-repeat repeat", "repeat-y");
+test_valid_value("mask-repeat", "no-repeat space");
+test_valid_value("mask-repeat", "no-repeat round");
+test_valid_value("mask-repeat", "no-repeat no-repeat", "no-repeat");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/crashtests/inline-float-parallel-flow.html b/tests/wpt/tests/css/css-multicol/crashtests/inline-float-parallel-flow.html
new file mode 100644
index 00000000000..06e80f1cd84
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/crashtests/inline-float-parallel-flow.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+  <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1489177">
+  <div style="columns:2; column-fill:auto; height:200px; line-height:20px; orphans:1; widows:1;">
+    <div style="width:10px;">
+      bazinga
+      <span>
+        <div style="float:left; height:300px; contain:size;"></div>
+        <br>
+      </span>
+    </div>
+    <div id="e57" style="display:none;"></div>
+  </div>
+  <script>
+    requestAnimationFrame(()=> {
+      requestAnimationFrame(()=> {
+        e57.style.display = "block";
+        document.documentElement.classList.remove("reftest-wait");
+      });
+    });
+  </script>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-multicol-in-relpos-multicol-in-multicol.html b/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-multicol-in-relpos-multicol-in-multicol.html
new file mode 100644
index 00000000000..ed6b63e5cb9
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-multicol-in-relpos-multicol-in-multicol.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1492021">
+<div style="columns:6;">
+  <div style="columns:3; position:relative;">
+    <div style="columns:2;">
+      <div style="position:relative; column-span:all;">
+        <div style="position:absolute; columns:2; column-fill:auto; height:1px;">
+          <div style="position:relative; border:solid;">
+            <div style="position:absolute;"></div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-spanner-multicol-in-multicol-in-multicol.html b/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-spanner-multicol-in-multicol-in-multicol.html
new file mode 100644
index 00000000000..f52fec4fac5
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/crashtests/oof-in-oof-multicol-in-relpos-spanner-in-spanner-multicol-in-multicol-in-multicol.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1492021">
+<div style="columns:6;">
+  <div style="columns:3;">
+    <div style="columns:2; column-span:all;">
+      <div style="position:relative; column-span:all;">
+        <div style="position:absolute; columns:2; column-fill:auto; height:1px;">
+          <div style="position:relative; border:solid;">
+            <div style="position:absolute;"></div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-multicol/crashtests/text-in-inline-interrupted-by-float.html b/tests/wpt/tests/css/css-multicol/crashtests/text-in-inline-interrupted-by-float.html
new file mode 100644
index 00000000000..fbb26507a21
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/crashtests/text-in-inline-interrupted-by-float.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1494201">
+<div style="columns:3; column-fill:auto; height:100px; line-height:50px; orphans:1; widows:1;">
+  <div style="width:1px;">
+    <span style="padding-left:100px;">
+      <div style="float:left; contain:size; width:100%; height:100px;"></div>
+      firstcolumn thirdcolumn
+    </span>
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/css-multicol/move-with-text-after-paint-ref.html b/tests/wpt/tests/css/css-multicol/move-with-text-after-paint-ref.html
new file mode 100644
index 00000000000..bb5d56f26b1
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/move-with-text-after-paint-ref.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+  <div style="columns:3;">
+    <div style="position:relative; top:100px;">
+      Short loin tri-tip pork belly, tail venison capicola turducken sausage
+      pork. Turkey ribeye pork belly chicken chuck, speck shank tail short loin
+      bacon tongue prosciutto. Tenderloin pastrami turkey, rump ball tip
+      frankfurter ham hock pork chop sausage filet mignon beef hamburger pork
+      sirloin speck. Meatball pig pork chop, short loin shankle pork loin flank
+      ball tip capicola ham hock pork shank turkey pastrami. Corned beef
+      capicola ribeye turkey bresaola, ground round fatback turducken.
+    </div>
+  </div>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/move-with-text-after-paint.html b/tests/wpt/tests/css/css-multicol/move-with-text-after-paint.html
new file mode 100644
index 00000000000..1ea3d4b58bc
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/move-with-text-after-paint.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+  <link rel="help" href="https://www.w3.org/TR/css-multicol-1/">
+  <link rel="match" href="move-with-text-after-paint-ref.html">
+  <div style="columns:3;">
+    <div id="container" style="position:relative; top:0;">
+      Short loin tri-tip pork belly, tail venison capicola turducken sausage
+      pork. Turkey ribeye pork belly chicken chuck, speck shank tail short loin
+      bacon tongue prosciutto. Tenderloin pastrami turkey, rump ball tip
+      frankfurter ham hock pork chop sausage filet mignon beef hamburger pork
+      sirloin speck. Meatball pig pork chop, short loin shankle pork loin flank
+      ball tip capicola ham hock pork shank turkey pastrami. Corned beef
+      capicola ribeye turkey bresaola, ground round fatback turducken.
+    </div>
+  </div>
+
+  <script>
+    requestAnimationFrame(()=> {
+      requestAnimationFrame(()=> {
+        container.style.top = "100px";
+        document.documentElement.classList.remove("reftest-wait");
+      });
+    });
+  </script>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint-ref.html b/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint-ref.html
new file mode 100644
index 00000000000..2876b93f37b
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+  <p style="columns:3; column-rule:solid;">
+    Short loin tri-tip pork belly, tail venison capicola turducken sausage
+    pork. Turkey ribeye pork belly chicken chuck, speck shank tail short loin
+    bacon tongue prosciutto. Tenderloin pastrami turkey, rump ball tip
+    frankfurter ham hock pork chop sausage filet mignon beef hamburger pork
+    sirloin speck. Meatball pig pork chop, short loin shankle pork loin flank
+    ball tip capicola ham hock pork shank turkey pastrami. Corned beef capicola
+    ribeye turkey bresaola, ground round fatback turducken.
+  </p>
+  <p style="columns:3; column-rule:solid;">
+    Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.
+  </p>
+</html>
diff --git a/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint.html b/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint.html
new file mode 100644
index 00000000000..9e0b31ddbe5
--- /dev/null
+++ b/tests/wpt/tests/css/css-multicol/resize-with-text-after-paint.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+  <link rel="help" href="https://www.w3.org/TR/css-multicol-1/">
+  <link rel="match" href="resize-with-text-after-paint-ref.html">
+  <p id="first" style="columns:3; width:50%; column-rule:solid;">
+    Short loin tri-tip pork belly, tail venison capicola turducken sausage
+    pork. Turkey ribeye pork belly chicken chuck, speck shank tail short loin
+    bacon tongue prosciutto. Tenderloin pastrami turkey, rump ball tip
+    frankfurter ham hock pork chop sausage filet mignon beef hamburger pork
+    sirloin speck. Meatball pig pork chop, short loin shankle pork loin flank
+    ball tip capicola ham hock pork shank turkey pastrami. Corned beef capicola
+    ribeye turkey bresaola, ground round fatback turducken.
+  </p>
+  <p id="second" style="columns:3; width:200%; column-rule:solid;">
+    Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.
+  </p>
+
+  <script>
+    requestAnimationFrame(()=> {
+      requestAnimationFrame(()=> {
+        first.style.width = "auto";
+        second.style.width = "auto";
+        document.documentElement.classList.remove("reftest-wait");
+      });
+    });
+  </script>
+</html>
diff --git a/tests/wpt/tests/css/css-nesting/implicit-nesting-ident-recovery.html b/tests/wpt/tests/css/css-nesting/implicit-nesting-ident-recovery.html
new file mode 100644
index 00000000000..f3648324ce1
--- /dev/null
+++ b/tests/wpt/tests/css/css-nesting/implicit-nesting-ident-recovery.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<title>CSS Nesting: Nesting, error recovery</title>
+<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  #target1 {
+    display:block;
+    display:new-block;
+    color:green;
+  }
+  #target2 {
+    display:block;
+    display:hover {};
+    color:green;
+  }
+</style>
+<div id=target1>Green</div>
+<div id=target2>Green</div>
+<script>
+  test(() => {
+    assert_equals(getComputedStyle(target1).color, 'rgb(0, 128, 0)');
+  }, 'Unknown declaration does not consume subsequent declaration');
+</script>
+<script>
+  test(() => {
+    assert_equals(getComputedStyle(target2).color, 'rgb(0, 128, 0)');
+  }, 'Unknown declaration with blocks does not consume subsequent declaration');
+</script>
diff --git a/tests/wpt/tests/css/css-nesting/implicit-nesting-ident.html b/tests/wpt/tests/css/css-nesting/implicit-nesting-ident.html
new file mode 100644
index 00000000000..d6d06b9b31c
--- /dev/null
+++ b/tests/wpt/tests/css/css-nesting/implicit-nesting-ident.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>CSS Nesting: Implicit nesting (ident)</title>
+<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  #main {
+    div {
+      color: green;
+    }
+  }
+</style>
+<div id=main>
+  <div id=target>
+    Green
+  </div>
+</main>
+<script>
+  test(() => {
+    assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
+  }, 'Nested rule starting with tag');
+</script>
diff --git a/tests/wpt/tests/css/css-position/position-absolute-margin-auto-001.html b/tests/wpt/tests/css/css-position/position-absolute-margin-auto-001.html
new file mode 100644
index 00000000000..9ec1c3f0116
--- /dev/null
+++ b/tests/wpt/tests/css/css-position/position-absolute-margin-auto-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<title>Tests the calculation of negative auto margins of absolutely positioned element</title>
+<link rel="help" href="https://drafts.csswg.org/css-position/#abspos-margins">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1492323">
+<link rel="author" href="mailto:xiaochengh@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<style>
+.cb {
+  position: relative;
+  width: 400px;
+  height: 400px;
+  outline: 1px dashed black;
+}
+
+.target {
+  writing-mode: vertical-lr;
+  position: absolute;
+  background: green;
+  width: calc(100% - 100px);
+  height: calc(100% - 100px);
+  inset: 100px;
+  margin: auto;
+}
+</style>
+
+<body onload="checkLayout('.target')">
+  <div class="cb">
+    <div class="target"
+         data-expected-margin-top="-50" data-expected-margin-bottom="-50"
+         data-expected-margin-left="0" data-expected-margin-right="-100"></div>
+  </div>
+</body>
diff --git a/tests/wpt/tests/css/css-properties-values-api/at-property-cssom.html b/tests/wpt/tests/css/css-properties-values-api/at-property-cssom.html
index f7981f245af..27041c2ad0c 100644
--- a/tests/wpt/tests/css/css-properties-values-api/at-property-cssom.html
+++ b/tests/wpt/tests/css/css-properties-values-api/at-property-cssom.html
@@ -18,7 +18,7 @@
     inherits: false;
   }
   @property --valid-whitespace {
-    syntax: " <color>+ ";
+    syntax: " <color># ";
     inherits: false;
     initial-value: red, blue;
   }
@@ -38,10 +38,14 @@
     syntax: "<color> | none";
     initial-value: red;
   }
-  @property --no-initial-value {
+  @property --no-initial-color-value {
     syntax: "<color> | none";
     inherits: false;
   }
+  @property --no-initial-universal-value {
+    syntax: "*";
+    inherits: false;
+  }
   @property --syntax-only {
     syntax: "<color> | none";
   }
@@ -52,7 +56,10 @@
     initial-value: red;
   }
   /* U+0009 CHARACTER TABULATION */
-  @property --tab\9 tab {  }
+  @property --tab\9 tab {
+    syntax: "*";
+    inherits: true;
+  }
 </style>
 <script>
 
@@ -66,6 +73,13 @@ function find_at_property_rule(name) {
   return null;
 }
 
+function test_invalid(name) {
+  test(() => {
+    let rule = find_at_property_rule(name);
+    assert_true(!rule);
+  }, `Rule for ${name} is invalid`);
+}
+
 function test_css_text(name, expected) {
   test(() => {
     let rule = find_at_property_rule(name);
@@ -106,22 +120,26 @@ function test_initial_value(name, expected) {
   }, `Rule for ${name} returns expected value for CSSPropertyRule.initialValue`);
 }
 
+// Invalid @property rules.
+test_invalid('--no-descriptors');
+test_invalid('--no-syntax');
+test_invalid('--no-inherits');
+test_invalid('--no-initial-color-value');
+test_invalid('--syntax-only', '@property --syntax-only { syntax: "<color> | none"; }');
+test_invalid('--inherits-only', '@property --inherits-only { inherits: true; }');
+test_invalid('--initial-value-only', '@property --initial-value-only { initial-value: red; }');
+
 // CSSPropertyRule.cssText
 
 test_css_text('--valid', '@property --valid { syntax: "<color> | none"; inherits: false; initial-value: red; }');
 test_css_text('--valid-reverse', '@property --valid-reverse { syntax: "<length>"; inherits: true; initial-value: 0px; }');
 test_css_text('--valid-universal', '@property --valid-universal { syntax: "*"; inherits: false; }');
-test_css_text('--valid-whitespace', '@property --valid-whitespace { syntax: " <color>+ "; inherits: false; initial-value: red, blue; }');
+test_css_text('--valid-whitespace', '@property --valid-whitespace { syntax: " <color># "; inherits: false; initial-value: red, blue; }');
 test_css_text('--vALId', '@property --vALId { syntax: "<color> | none"; inherits: false; initial-value: red; }');
 
-test_css_text('--no-descriptors', '@property --no-descriptors { }');
-test_css_text('--no-syntax', '@property --no-syntax { inherits: false; initial-value: red; }');
-test_css_text('--no-inherits', '@property --no-inherits { syntax: "<color> | none"; initial-value: red; }');
-test_css_text('--no-initial-value', '@property --no-initial-value { syntax: "<color> | none"; inherits: false; }');
-test_css_text('--syntax-only', '@property --syntax-only { syntax: "<color> | none"; }');
-test_css_text('--inherits-only', '@property --inherits-only { inherits: true; }');
-test_css_text('--initial-value-only', '@property --initial-value-only { initial-value: red; }');
-test_css_text('--tab\ttab', '@property --tab\\9 tab { }');
+test_css_text('--no-initial-universal-value', '@property --no-initial-universal-value { syntax: "*"; inherits: false; }');
+
+test_css_text('--tab\ttab', '@property --tab\\9 tab { syntax: "*"; inherits: true; }');
 
 // CSSRule.type
 
@@ -138,29 +156,17 @@ test_name('--valid-universal');
 test_name('--valid-whitespace');
 test_name('--vALId');
 
-test_name('--no-descriptors');
-test_name('--no-syntax');
-test_name('--no-inherits');
-test_name('--no-initial-value');
-test_name('--syntax-only');
-test_name('--inherits-only');
-test_name('--initial-value-only');
+test_name('--no-initial-universal-value');
 
 // CSSPropertyRule.syntax
 
 test_syntax('--valid', '<color> | none');
 test_syntax('--valid-reverse', '<length>');
 test_syntax('--valid-universal', '*');
-test_syntax('--valid-whitespace', ' <color>+ ');
+test_syntax('--valid-whitespace', ' <color># ');
 test_syntax('--vALId', '<color> | none');
 
-test_syntax('--no-descriptors', '');
-test_syntax('--no-syntax', '');
-test_syntax('--no-inherits', '<color> | none');
-test_syntax('--no-initial-value', '<color> | none');
-test_syntax('--syntax-only', '<color> | none');
-test_syntax('--inherits-only', '');
-test_syntax('--initial-value-only', '');
+test_syntax('--no-initial-universal-value', '*');
 
 // CSSPropertyRule.inherits
 
@@ -170,13 +176,7 @@ test_inherits('--valid-universal', false);
 test_inherits('--valid-whitespace', false);
 test_inherits('--vALId', false);
 
-test_inherits('--no-descriptors', false);
-test_inherits('--no-syntax', false);
-test_inherits('--no-inherits', false);
-test_inherits('--no-initial-value', false);
-test_inherits('--syntax-only', false);
-test_inherits('--inherits-only', true);
-test_inherits('--initial-value-only', false);
+test_inherits('--no-initial-universal-value', false);
 
 // CSSPropertyRule.initialValue
 
@@ -186,12 +186,6 @@ test_initial_value('--valid-universal', null);
 test_initial_value('--valid-whitespace', 'red, blue');
 test_initial_value('--vALId', 'red');
 
-test_initial_value('--no-descriptors', null);
-test_initial_value('--no-syntax', 'red');
-test_initial_value('--no-inherits', 'red');
-test_initial_value('--no-initial-value', null);
-test_initial_value('--syntax-only', null);
-test_initial_value('--inherits-only', null);
-test_initial_value('--initial-value-only', 'red');
+test_initial_value('--no-initial-universal-value', null);
 
 </script>
diff --git a/tests/wpt/tests/css/css-properties-values-api/at-property.html b/tests/wpt/tests/css/css-properties-values-api/at-property.html
index 95d30af15a2..950d9b02d7b 100644
--- a/tests/wpt/tests/css/css-properties-values-api/at-property.html
+++ b/tests/wpt/tests/css/css-properties-values-api/at-property.html
@@ -30,13 +30,66 @@ function get_cssom_descriptor_value(rule, descriptor) {
 // Test that for the given descriptor (e.g. 'syntax'), the specified value
 // will yield the expected_value when observed using CSSOM. If the expected_value
 // is omitted, it is the same as the specified value.
-function test_descriptor(descriptor, specified_value, expected_value) {
-  let camel = to_camel_case(descriptor);
-  if (typeof(expected_value) === 'undefined')
-    expected_value = specified_value;
-  test_with_at_property({ [camel]: specified_value }, (name, rule) => {
-    assert_equals(get_cssom_descriptor_value(rule, descriptor), expected_value);
-  }, `Attribute '${descriptor}' returns expected value for [${specified_value}]`);
+function test_descriptor(descriptor, specified_value, expected_value, other_descriptors) {
+  // Try and build a valid @property form the specified descriptor.
+  let at_property = { [to_camel_case(descriptor)]: specified_value };
+
+  // If extra values are specified in other_descriptors, just use them.
+  if (typeof(other_descriptors) !== 'unspecified') {
+    for (let name in other_descriptors) {
+      if (other_descriptors.hasOwnProperty(name)) {
+        if (name == descriptor) {
+          throw `Unexpected ${name} in other_descriptors`;
+        }
+        at_property[to_camel_case(name)] = other_descriptors[name];
+      }
+    }
+  }
+
+  if (!('syntax' in at_property)) {
+    // The syntax descriptor is required. Use the universal one as a fallback.
+    // https://drafts.css-houdini.org/css-properties-values-api-1/#the-syntax-descriptor
+    at_property.syntax = '"*"';
+  }
+  if (!('inherits' in at_property)) {
+    // The inherits descriptor is required. Make it true as a fallback.
+    // https://drafts.css-houdini.org/css-properties-values-api-1/#inherits-descriptor
+    at_property.inherits = true;
+  }
+  if (!at_property.syntax.match(/^"\s*\*\s*"$/) &&
+      !('initialValue' in at_property)) {
+    // The initial-value is required for non-universal syntax.
+    // Pick a computationally independent value that follows specified syntax.
+    // https://drafts.css-houdini.org/css-properties-values-api-1/#the-syntax-descriptor
+    at_property.initialValue = (() => {
+      let first_syntax_component = specified_value
+        .replace(/^"(.*)"$/, '$1') // unquote
+        .replace(/[\s\uFEFF\xA0]+/g, ' ') // collapse whitespaces
+        .match(/^[^|\#\+]*/)[0] // pick first component
+        .trim();
+       switch (first_syntax_component) {
+         case '<color>': return 'blue';
+         case '<length>': return '42px';
+         default:
+           if (first_syntax_component.startsWith('<')) {
+             throw `Unsupported data type name '${first_syntax_component}'`;
+           }
+           return first_syntax_component; // <custom-ident>
+       }
+    })();
+  }
+
+  if (expected_value === null) {
+    test_with_at_property(at_property, (name, rule) => {
+      assert_true(!rule);
+    }, `Attribute '${descriptor}' makes the @property rule invalid for [${specified_value}]`);
+  } else {
+    if (typeof(expected_value) === 'undefined')
+      expected_value = specified_value;
+    test_with_at_property(at_property, (name, rule) => {
+      assert_equals(get_cssom_descriptor_value(rule, descriptor), expected_value);
+    }, `Attribute '${descriptor}' returns expected value for [${specified_value}]`);
+  }
 }
 
 // syntax
@@ -52,19 +105,36 @@ for (const syntax of ["*", " * ", "* ", "\t*\t"]) {
   test_descriptor('syntax', `"${syntax}"`, syntax);
 }
 
-test_descriptor('syntax', 'red', '');
-test_descriptor('syntax', 'rgb(255, 0, 0)', '');
-test_descriptor('syntax', '<color>', '');
-test_descriptor('syntax', 'foo | bar', '');
+// syntax: <color> value
+test_descriptor('syntax', '"red"', "red"); // treated as <custom-ident>.
+test_descriptor('syntax', '"rgb(255, 0, 0)"', null);
+
+// syntax: missing quotes
+test_descriptor('syntax', '<color>', null);
+test_descriptor('syntax', 'foo | bar', null);
+
+// syntax: invalid <custom-ident>
+// https://drafts.csswg.org/css-values-4/#custom-idents
+for (const syntax of
+  ["default",
+   "initial",
+   "inherit",
+   "unset",
+   "revert",
+   "revert-layer",
+  ]) {
+  test_descriptor('syntax', `"${syntax}"`, null);
+  test_descriptor('syntax', `"${uppercase_first(syntax)}"`, null);
+}
 
 // syntax: pipe between components
-test_descriptor('syntax', 'foo bar', '');
-test_descriptor('syntax', 'Foo <length>', '');
-test_descriptor('syntax', 'foo, bar', '');
-test_descriptor('syntax', '<length> <percentage>', '');
+test_descriptor('syntax', '"foo bar"', null, {'initial-value': 'foo bar'});
+test_descriptor('syntax', '"Foo <length>"', null, {'initial-value': 'Foo 42px'});
+test_descriptor('syntax', '"foo, bar"', null, {'initial-value': 'foo, bar'});
+test_descriptor('syntax', '"<length> <percentage>"', null, {'initial-value': '42px 100%'});
 
-// syntax: leaading bar
-test_descriptor('syntax', '|<length>', '');
+// syntax: leading bar
+test_descriptor('syntax', '"|<length>"', null, {'initial-value': '42px'});
 
 // initial-value
 test_descriptor('initial-value', '10px');
@@ -72,18 +142,21 @@ test_descriptor('initial-value', 'rgb(1, 2, 3)');
 test_descriptor('initial-value', 'red');
 test_descriptor('initial-value', 'foo');
 test_descriptor('initial-value', 'if(){}');
-test_descriptor('initial-value', 'var(--x)');
+
+// initial-value: not computationally independent
+test_descriptor('initial-value', '3em', null, {'syntax': '"<length>"'});
+test_descriptor('initial-value', 'var(--x)', null);
 
 // inherits
 test_descriptor('inherits', 'true', true);
 test_descriptor('inherits', 'false', false);
 
-test_descriptor('inherits', 'none', false);
-test_descriptor('inherits', '0', false);
-test_descriptor('inherits', '1', false);
-test_descriptor('inherits', '"true"', false);
-test_descriptor('inherits', '"false"', false);
-test_descriptor('inherits', 'calc(0)', false);
+test_descriptor('inherits', 'none', null);
+test_descriptor('inherits', '0', null);
+test_descriptor('inherits', '1', null);
+test_descriptor('inherits', '"true"', null);
+test_descriptor('inherits', '"false"', null);
+test_descriptor('inherits', 'calc(0)', null);
 
 test_with_style_node('@property foo { }', (node) => {
   assert_equals(node.sheet.rules.length, 0);
diff --git a/tests/wpt/tests/css/css-properties-values-api/property-cascade.html b/tests/wpt/tests/css/css-properties-values-api/property-cascade.html
index bb50213d5ce..68417a578ac 100644
--- a/tests/wpt/tests/css/css-properties-values-api/property-cascade.html
+++ b/tests/wpt/tests/css/css-properties-values-api/property-cascade.html
@@ -24,7 +24,7 @@
 test(function(){
     // Because var(--my-color) is invalid, our color declaration should behave
     // like color:unset, i.e. it should compute to the inherited color.
-    assert_equals(inner.computedStyleMap().get('color').toString(), 'rgb(1, 1, 1)');
+    assert_equals(getComputedStyle(inner).color, 'rgb(1, 1, 1)');
 
     CSS.registerProperty({
         name: '--my-color',
@@ -36,7 +36,7 @@ test(function(){
     // After registering, var(--my-color) is still invalid. The important thing
     // here is that the computed value of color is the initialValue of
     // --my-color, and not rgb(2, 2, 2).
-    assert_equals(inner.computedStyleMap().get('color').toString(), 'rgb(3, 3, 3)');
+    assert_equals(getComputedStyle(inner).color, 'rgb(3, 3, 3)');
 }, 'Registering a property does not affect cascade');
 
 test(function(){
@@ -56,7 +56,7 @@ test(function(){
 
     outer.appendChild(element);
 
-    assert_equals(element.computedStyleMap().get('color').toString(), 'rgb(4, 4, 4)');
+    assert_equals(getComputedStyle(element).color, 'rgb(4, 4, 4)');
 }, 'Registering a property does not affect parsing');
 
 
diff --git a/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002-ref.html b/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002-ref.html
new file mode 100644
index 00000000000..758e769d782
--- /dev/null
+++ b/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Invalidation after CSS.registerProperty (reference)</title>
+    <style>
+      .failure {
+          background: pink;
+      }
+      #visibility {
+          visibility: hidden;
+      }
+      #display {
+          display: none;
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test PASS if you see no red in the list below.</p>
+    <ul>
+      <li>visibility <span id="visibility" class="failure">FAIL</span></li>
+      <li>display <span id="display" class="failure">FAIL</span></li>
+    </ul>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002.html b/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002.html
new file mode 100644
index 00000000000..a62461c7d8a
--- /dev/null
+++ b/tests/wpt/tests/css/css-properties-values-api/registered-property-change-style-002.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html class="reftest-wait">
+  <head>
+    <meta charset="utf-8">
+    <title>Invalidation after CSS.registerProperty</title>
+    <link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#registered-custom-property">
+    <link rel="match" href="registered-property-change-style-002-ref.html">
+    <meta name="assert" content="Rendering should properly be updated after call to CSS.registerProperty.">
+    <style>
+      .failure {
+          background: pink;
+      }
+      #visibility {
+          visibility: var(--my-visibility, visible);
+      }
+      #display {
+          display: var(--my-display, inline-block);
+      }
+    </style>
+  </head>
+  <body>
+    <p>This test PASS if you see no red in the list below.</p>
+    <ul>
+      <li>visibility <span id="visibility" class="failure">FAIL</span></li>
+      <li>display <span id="display" class="failure">FAIL</span></li>
+    </ul>
+    <script>
+      document.documentElement.addEventListener("TestRendered", () => {
+          CSS.registerProperty({
+              name: "--my-visibility",
+              syntax: "*",
+              initialValue: "hidden",
+              inherits: false,
+          });
+          CSS.registerProperty({
+              name: "--my-display",
+              syntax: "*",
+              initialValue: "none",
+              inherits: false,
+          });
+          document.documentElement.removeAttribute("class");
+      });
+    </script>
+  </body>
+</html>
diff --git a/tests/wpt/tests/css/css-pseudo/first-line-input-image-crash.html b/tests/wpt/tests/css/css-pseudo/first-line-input-image-crash.html
new file mode 100644
index 00000000000..66bd0330f08
--- /dev/null
+++ b/tests/wpt/tests/css/css-pseudo/first-line-input-image-crash.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>Don't crash when using ::first-line and &lt;input type=image&gt;</title>
+<link rel="help" href="https://crbug.com/1486128">
+<style>
+  * { display:initial; }
+  *::first-line { color:green; }
+</style>
+<div>PASS if no crash</div>
+<input type="image">
diff --git a/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012-ref.html b/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012-ref.html
new file mode 100644
index 00000000000..1effaf39223
--- /dev/null
+++ b/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012-ref.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+<style>
+  .container {
+    overflow: auto;
+    height: 200px;
+    width: 200px;
+    background-color: red;
+  }
+</style>
+<div class="container">
+  <div class="content"></div>
+</div>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012.html b/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012.html
new file mode 100644
index 00000000000..974c6012b20
--- /dev/null
+++ b/tests/wpt/tests/css/css-scrollbars/scrollbar-color-012.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+<title>scrollbar-color with transparent colors works</title>
+<link rel="author" title="Luke Warlow" href="mailto:luke@warlow.dev" />
+<link rel="match" href="scrollbar-color-012-ref.html" />
+<link rel="help" href="https://drafts.csswg.org/css-scrollbars" />
+<style>
+  html {scrollbar-color: transparent transparent;}
+  body {height: 200vh}
+  .container {
+    overflow: auto;
+    height: 200px;
+    width: 200px;
+    background-color: red;
+  }
+
+  .content {
+    height: 300px;
+    width: 300px;
+  }
+</style>
+<div class="container">
+  <div class="content"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-sizing/aspect-ratio/replaced-element-003.html b/tests/wpt/tests/css/css-sizing/aspect-ratio/replaced-element-003.html
index 306976ac992..171d23543f5 100644
--- a/tests/wpt/tests/css/css-sizing/aspect-ratio/replaced-element-003.html
+++ b/tests/wpt/tests/css/css-sizing/aspect-ratio/replaced-element-003.html
@@ -10,7 +10,6 @@
 <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
 
 <div>
-  <video src="support/2x2-green.ogv" style="background: green; width: 100px; aspect-ratio: 2/1; vertical-align: bottom;"></video>
+  <video src="support/2x2-green.webm" style="background: green; width: 100px; aspect-ratio: 2/1; vertical-align: bottom;"></video>
 </div>
 <div style="width: 100px; height: 50px; background: green;"></div>
-
diff --git a/tests/wpt/tests/css/css-syntax/custom-property-rule-ambiguity.html b/tests/wpt/tests/css/css-syntax/custom-property-rule-ambiguity.html
new file mode 100644
index 00000000000..50728bc94c2
--- /dev/null
+++ b/tests/wpt/tests/css/css-syntax/custom-property-rule-ambiguity.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<title>CSS Syntax: Rules that look like custom properties</title>
+<link rel="help" href="https://drafts.csswg.org/css-syntax/#consume-qualified-rule">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style id=stylesheet1>
+  .a { }
+  --x:hover { } /* Ambiguous "rule" */
+  .b { }
+</style>
+<script>
+  test(() => {
+    let rules = stylesheet1.sheet.rules;
+    assert_equals(rules.length, 2);
+    assert_equals(rules[0].selectorText, '.a');
+    assert_equals(rules[1].selectorText, '.b');
+  }, 'Rule that looks like a custom property declaration is ignored');
+</script>
+
+<!-- https://github.com/w3c/csswg-drafts/issues/9336 -->
+<style id=stylesheet2>
+  .a { }
+  --x:hover { ] } /* Ambiguous "rule" */
+  .b { }
+</style>
+<script>
+  test(() => {
+    let rules = stylesheet2.sheet.rules;
+    assert_equals(rules.length, 2);
+    assert_equals(rules[0].selectorText, '.a');
+    assert_equals(rules[1].selectorText, '.b');
+  }, 'Rule that looks like an invalid custom property declaration is ignored');
+</script>
+
+<style id=stylesheet3>
+  div {
+    .a { }
+    --x:hover { }
+    .b { }
+  }
+</style>
+<script>
+  test(() => {
+    let rules = stylesheet3.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].selectorText, 'div');
+    let div = rules[0];
+    let x = div.style.getPropertyValue('--x');
+    assert_equals(x, 'hover { }\n    .b { }');
+    let childRules = div.cssRules;
+    assert_equals(childRules.length, 1);
+    assert_equals(childRules[0].selectorText, '.a');
+  }, 'Nested rule that looks like a custom property declaration');
+</script>
+
+<!-- https://github.com/w3c/csswg-drafts/issues/9336 -->
+
+<style id=stylesheet4>
+  div {
+    .a { }
+    --x:hover { ] }
+    .b { }
+  }
+</style>
+<script>
+  test(() => {
+    let rules = stylesheet4.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].selectorText, 'div');
+    let div = rules[0];
+    // There is no valid --x declaration, because mismatched ] is not allowed
+    // in custom properties.
+    let x = div.style.getPropertyValue('--x');
+    assert_equals(x, '');
+    // We should also not have restarted parsing as a nested style rule,
+    // and instead we should have "consumed the remnants of a bad declaration",
+    // which skips to the next semicolon (or end-of-block).
+    // So in other words, there should be no nested '.b.' child rule here.
+    let childRules = div.cssRules;
+    assert_equals(childRules.length, 1);
+    assert_equals(childRules[0].selectorText, '.a');
+  }, 'Nested rule that looks like an invalid custom property declaration');
+</script>
diff --git a/tests/wpt/tests/css/css-syntax/trailing-braces.html b/tests/wpt/tests/css/css-syntax/trailing-braces.html
new file mode 100644
index 00000000000..ac2e8e61b99
--- /dev/null
+++ b/tests/wpt/tests/css/css-syntax/trailing-braces.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<title>CSS Syntax: trailing braces</title>
+<link rel="help" href="https://drafts.csswg.org/css-syntax-1/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style id=style>
+  #target1 {
+    color:green;
+    color:red{};
+    color:red {};
+  }
+</style>
+<div id=target1>Green</div>
+<script>
+  test(() => {
+    let rules = style.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.color, 'green');
+  }, 'Trailing braces are not valid');
+</script>
diff --git a/tests/wpt/tests/css/css-syntax/var-with-blocks.html b/tests/wpt/tests/css/css-syntax/var-with-blocks.html
new file mode 100644
index 00000000000..915a2467e3a
--- /dev/null
+++ b/tests/wpt/tests/css/css-syntax/var-with-blocks.html
@@ -0,0 +1,219 @@
+<!DOCTYPE html>
+<title>CSS Syntax: {}-blocks in declaration values</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9317">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- Standard properties -->
+
+<style id=plain_var>
+  .a {
+    color: rgb(2, 2, 2);
+    color:var(--x); /* Valid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = plain_var.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, 'var(--x)');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'Plain var()');
+</script>
+
+<style id=whole_value_block>
+  .a {
+    color: rgb(2, 2, 2);
+    color:{var(--x)}; /* Valid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = whole_value_block.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, '{var(--x)}');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'Whole-value block with var()');
+</script>
+
+<style id=whole_value_block_with_space>
+  .a {
+    color: rgb(2, 2, 2);
+    color: { var(--x) }; /* Valid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = whole_value_block_with_space.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, '{ var(--x) }');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'Whole-value block with var() (spaces)');
+</script>
+
+<style id=trailing_block>
+  .a {
+    color: rgb(2, 2, 2);
+    color:var(--x) { }; /* Invalid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = trailing_block.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, 'rgb(2, 2, 2)');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'Trailing block, leading var()');
+</script>
+
+<style id=leading_block>
+  .a {
+    color: rgb(2, 2, 2);
+    color:{ } var(--x); /* Invalid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = leading_block.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, 'rgb(2, 2, 2)');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'Leading block, trailing var()');
+</script>
+
+<style id=in_block_var_with_trailing_token>
+  .a {
+    color: rgb(2, 2, 2);
+    color:{ var(--x) } A; /* Invalid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = in_block_var_with_trailing_token.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, 'rgb(2, 2, 2)');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'In-block var() with trailing token');
+</script>
+
+<style id=in_block_var_with_leading_token>
+  .a {
+    color: rgb(2, 2, 2);
+    color:A { var(--x) }; /* Invalid */
+    background-color:rgb(1, 1, 1);
+  }
+</style>
+<script>
+  test(() => {
+    let rules = in_block_var_with_leading_token.sheet.rules;
+    assert_equals(rules.length, 1);
+    let declarations = rules[0].style;
+    assert_equals(declarations.color, 'rgb(2, 2, 2)');
+    assert_equals(declarations.backgroundColor, 'rgb(1, 1, 1)');
+  }, 'In-block var() with leading token');
+</script>
+
+<!-- Custom Properties -->
+
+<style id=plain_var_custom>
+  .a {
+    --y:var(--x); /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = plain_var_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), 'var(--x)');
+  }, 'Plain var() (custom property)');
+</script>
+
+<style id=whole_value_block_custom>
+  .a {
+    --y:{var(--x)}; /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = whole_value_block_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), '{var(--x)}');
+  }, 'Whole-value block with var() (custom property)');
+</script>
+
+<style id=whole_value_block_with_space_custom>
+  .a {
+    --y: { var(--x) }; /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = whole_value_block_with_space_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), '{ var(--x) }');
+  }, 'Whole-value block with var() (spaces, custom property)');
+</script>
+
+<style id=trailing_block_custom>
+  .a {
+    --y:var(--x) { }; /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = trailing_block_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), 'var(--x) { }');
+  }, 'Trailing block, leading var() (custom property)');
+</script>
+
+<style id=leading_block_custom>
+  .a {
+    --y:{ } var(--x); /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = leading_block_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), '{ } var(--x)');
+  }, 'Leading block, trailing var() (custom property)');
+</script>
+
+<style id=in_block_var_with_trailing_token_custom>
+  .a {
+    --y:{ var(--x) } A; /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = in_block_var_with_trailing_token_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), '{ var(--x) } A');
+  }, 'In-block var() with trailing token (custom property)');
+</script>
+
+<style id=in_block_var_with_leading_token_custom>
+  .a {
+    --y:A { var(--x) }; /* Valid */
+  }
+</style>
+<script>
+  test(() => {
+    let rules = in_block_var_with_leading_token_custom.sheet.rules;
+    assert_equals(rules.length, 1);
+    assert_equals(rules[0].style.getPropertyValue('--y'), 'A { var(--x) }');
+  }, 'In-block var() with leading token (custom property)');
+</script>
diff --git a/tests/wpt/tests/css/css-text/crashtests/text-wrap-balance-nested-blocks-crash.html b/tests/wpt/tests/css/css-text/crashtests/text-wrap-balance-nested-blocks-crash.html
new file mode 100644
index 00000000000..db79cb7d2d6
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/crashtests/text-wrap-balance-nested-blocks-crash.html
@@ -0,0 +1,365 @@
+<!DOCTYPE html>
+<html lang="en-US">
+<head>
+<meta charset="UTF-8">
+
+<title>Mozilla bug https://bugzilla.mozilla.org/show_bug.cgi?id=1858421</title>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1858421">
+
+<style>
+.main_content { text-wrap: balance; }
+</style>
+
+</head>
+<body>
+<p>
+HTML structure and text content from https://www.contestwatchers.com/international-visual-identity-awards-2024/<br>
+(© 2009 – 2023 Contest Watchers; used by permission, see https://creativecommons.org/licenses/by-sa/3.0/).<br>
+Stripped of styling and external links/resources, purely for testing purposes.
+</p>
+
+		<div>
+	<div class=main_content>
+		<div>
+			<aside>
+				<hr />
+			<div>
+				<div>
+					<a href="#"><span></span><span>Previous</span></a>				</div>
+				<article>
+	<div>
+		<h3><a href="#">Reuse the Thermae &#8211; Curinga &#8211; Architecture Competition</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" />			<figcaption>Image source: Reuse Italy</figcaption>		</figure>
+	<div><strong>3+ months <span>remaining</span></strong></div>	</a>
+		</div>
+</article>
+			</div>
+			<hr />
+			</aside>
+			<div>
+								<div>
+												<article>
+								<header><h1>International Visual Identity Awards 2024</h1></header>
+																	<figure>
+										<img width="620" height="380" src="." srcset="." sizes="(max-width: 620px) 100vw, 620px" />		<figcaption>Image source: <strong>International Visual Identity Awards</strong></figcaption>
+											</figure>
+																<div>
+									<aside>
+										<h2>Contest Status</h2>
+										<dl><dt>Deadline</dt><dd><span><strong>30 March 2024</strong></span><span> [ 6+ months remaining ]</span></dd><dt>Results Announcement Expected</dt><dd><span><strong>Summer 2024</strong></span></dd></dl><h2>Contest Disciplines</h2><ul>			<li><a href="#">Graphic Design</a></li>
+			</ul>									</aside>
+									<aside>
+
+									</aside>
+									<div>
+										<p>Now in their 11th year, the International Visual Identity Awards (IVIA) are a global competition loved by agencies and independent designers.</p>
+<p>With 20 diverse categories, there’s plenty of opportunity to share your branding project with the world. The awards were founded with a clear vision to provide an equal opportunity for all types of entry, from the freelance designer, through to small design studios and larger branding agencies.</p>
+<p>One winner and a second and third place runner-up will be announced in each category. One overall winner receives the title of &#8216;<strong>Visual Identity of the Year</strong>&#8216;.</p>
+<p>The twenty (20) competition categories for 2024 are:</p>
+<ul>
+<li><strong>Manufacturing</strong></li>
+<li><strong>Destination</strong></li>
+<li><strong>Sport</strong></li>
+<li><strong>Entertainment</strong></li>
+<li><strong>Technology</strong></li>
+<li><strong>Telecommunications</strong></li>
+<li><strong>Energy/Utilities</strong></li>
+<li><strong>Consumer products</strong></li>
+<li><strong>Public sector</strong></li>
+<li><strong>Media and publishing</strong></li>
+<li><strong>Transport and automotive</strong></li>
+<li><strong>Healthcare</strong></li>
+<li><strong>Financial services</strong></li>
+<li><strong>Food and drink</strong></li>
+<li><strong>Restaurants, hospitality, travel and leisure</strong></li>
+<li><strong>Retail</strong></li>
+<li><strong>Charity and non-profit</strong></li>
+<li><strong>Professional services</strong></li>
+<li><strong>Fashion</strong></li>
+<li><strong>Real Estate</strong></li>
+</ul>
+<p>Eligible entries must have been launched <strong>between 1st January 2022 and the final closing date</strong>. Entries are permitted from all countries worldwide.</p>
+<p>Entries must include not just a logo but also examples of its application across different items as part of a brand’s visual identity system.</p>
+<p>Winners will be announced in the summer of 2024.</p>
+<p>The International Visual Identity Awards are proudly celebrating their eleventh anniversary this year.</p>
+<h3>International Visual Identity Awards 2024 &#8211; Entry Fee</h3>
+<ul>
+<li>Early Bird Entry Fee: <strong>£135</strong> (+UK VAT where applicable) before 1st December 2023</li>
+<li>Standard Entry Fee: <strong>£150</strong> (+UK VAT where applicable)</li>
+</ul>
+																			</div>
+								</div>
+								<footer>
+									<h2>Links and Meta Information</h2>
+									<div>
+																			<a href="#">Visit Official Website</a>
+										<h3>Social Sharing Links</h3><ul>		<li>
+			<a target="_blank" href="#">
+			<i aria-label="Tweet"></i>
+			</a>
+		</li>
+				<li>
+			<a target="_blank" href="#">
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+			<a target="_blank" href="#">
+			<i aria-label="Share on LinkedIn"></i>
+			</a>
+		</li>
+		</ul>									</div>
+									<dl><dt>Organizer(s)</dt><dd><a href="#">International Visual Identity Awards</a></dd><dt>Published in</dt><dd><a href="#">Annual</a> / <a href="#">Graphic Design</a> / <a href="#">Open</a></dd><dt>Published after</dt><dd><a href="#">Reuse the Thermae &#8211; Curinga &#8211; Architecture Competition</a></dd><dt>Published before</dt><dd><a href="#">The Golden Sand Waterfront &#8211; TerraViva Competitions</a></dd><dt>Listed on</dt><dd><a href="#">11 October 2023</a></dd><dt>Updated on</dt><dd>11 October 2023</dd><dt>Listed by</dt><dd><a href="#"><span>Contest Watchers</span></a></dd></dl>
+									<fieldset>
+										<legend><label for="cw_short_permalink"><strong>Short permanent link to this page:</strong></label></legend>
+										<input type="text" size="50" readonly="readonly" value="https://www.contestwatchers.com/?p=39783" /></fieldset>
+								</footer>
+							</article>
+											</div>
+						<section>
+			<h2>Possibly Related Contests</h2>
+			<div>
+
+				<article>
+	<div>
+		<h3><a href="#">Curtas Vila do Conde 2024 – International Film Festival</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" />			<figcaption>Image source: Curtas Vila do Conde</figcaption>		</figure>
+	<div><strong>7+ months <span>remaining</span></strong></div>	</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">AMD Design Award 2023: Designing Energy‑Efficient Future</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" />			<figcaption>Image source: Advanced Micro Devices (AMD)</figcaption>		</figure>
+	<div><strong>3+ days <span>remaining</span></strong></div>			<span class="cw-free-mark badge
+			bg-success			">Free</span>
+			</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">Be Izmir Illustration Contest</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" />			<figcaption>Image source: İzmir Planning Agency (İZPA)</figcaption>		</figure>
+	<div><strong>1+ month <span>remaining</span></strong></div>			<span class="cw-free-mark badge
+			bg-success			">Free</span>
+			</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">Andreu World International Design Contest 2023</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" />			<figcaption>Image source: Andreu World</figcaption>		</figure>
+	<div><strong>2+ months <span>remaining</span></strong></div>			<span class="cw-free-mark badge
+			bg-success			">Free</span>
+			</a>
+		</div>
+</article>
+			</div>
+		</section>
+				<section>
+			<h2>Other Contests by <a href="#">International Visual Identity Awards</a></h2>
+			<div>
+
+				<article>
+	<div>
+		<h3><a href="#">International Visual Identity Awards 2016 Competition</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" srcset="." sizes="(max-width: 180px) 100vw, 180px" />					</figure>
+	<div>Expired</div>	</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">International Visual Identity Awards 2022</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" srcset="." sizes="(max-width: 180px) 100vw, 180px" />					</figure>
+	<div><strong>Finished</strong></div>	</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">International Visual Identity Awards 2020</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" srcset="." sizes="(max-width: 180px) 100vw, 180px" />					</figure>
+	<div><strong>Finished</strong></div>	</a>
+		</div>
+</article>
+<article>
+	<div>
+		<h3><a href="#">International Visual Identity Awards 2023</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" srcset="." sizes="(max-width: 180px) 100vw, 180px" />					</figure>
+	<div>Expired</div>	</a>
+		</div>
+</article>
+			</div>
+		</section>
+					</div>
+			<aside>
+				<hr />
+			<div>
+				<div>
+					<a href="#"><span>Next</span><span></span></a>				</div>
+				<article>
+	<div>
+		<h3><a href="#">The Golden Sand Waterfront &#8211; TerraViva Competitions</a></h3>
+
+<a href="#">
+			<figure>
+
+				<img width="180" height="180" src="." alt="" loading="lazy" />			<figcaption>Image source: Adobe Stock</figcaption>		</figure>
+	<div><strong>4+ months <span>remaining</span></strong></div>	</a>
+		</div>
+</article>
+			</div>
+			<hr />
+			</aside>
+		</div>
+	</div>
+</div>
+<div>
+	<div>
+		<div>
+			<div>
+				<div>
+					<div>
+						<div>
+							<h3>What is Contest Watchers?</h3>
+							<p>Launched in 2009, <a href="#">Contest Watchers</a> is <strong>a website dedicated to creative challenges and competitions worldwide</strong>. With a huge database of international contests in various disciplines, it comes handy to anyone who wants to compete for great prizes and recognition.</p>
+							<p>In a parallel universe, Contest Watchers is a super serious gang of five fictional characters.</p>
+						</div>
+						<div>
+							<h3>Sign up for the Contest Watchers Newsletter</h3>
+							<form>
+								<input type="hidden" name="subscribe" value="subscribe" />
+								<input type="hidden" name="htmlemail" value="1" />
+								<p>Get <strong>all new contests</strong> from Contest Watchers delivered directly to your inbox <strong>daily</strong> or <strong>weekly</strong>.</p>
+								<p>No worries! You can unsubscribe anytime.</p>
+								<div>
+									<input type="email" pattern="^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$" name="email" required="required" placeholder="Your email address">
+									<button type="submit">Sign up</button>
+								</div>
+								<div>
+									<div>
+										<input required checked type="checkbox" value="signup" name="list[2]">
+										<label for="list[2]">
+											Daily Newsletter
+										</label>
+									</div>
+									<div>
+										<input type="checkbox" value="signup" name="list[4]">
+										<label for="list[4]">
+											Weekly Newsletter
+										</label>
+									</div>
+								</div>
+							</form>
+						</div>
+					</div>
+					<div>
+						<div>
+							<div>
+								<div>
+									<div>
+										<h4>Information</h4>
+										<ul>
+											<li><a href="#">About</a></li>
+											<!--<li><a href="">Advertise</a></li>-->
+											<li><a href="#">Contact</a></li>
+											<li><a href="#">RSS Feed</a></li>
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+									</div>
+									<div>
+										<h4>Social Profiles</h4>
+										<ul>
+											<li><a href="#">Twitter</a></li>
+											<li><a href="#">Facebook</a></li>
+											<li><a href="#">LinkedIn</a></li>
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+									</div>
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+							</div>
+							<div>
+								<div>
+									<div>
+										<h4>Tools</h4>
+										<ul>
+											<li><a href="#">Suggest Contest</a></li>
+											<li><a href="#">Submit Contest</a></li>
+											<li><a href="#">Network</a></li>
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+										<h4>Goodies</h4>
+										<ul>
+											<li><a href="#" target="_blank">Manage Newsletter Subscriptions</a></li>
+											<li><a href="#">Contests Guide</a></li>
+											<!-- <li><a>Wallpapers</a> (soon)</li> -->
+											<!-- <li><a>Banners</a> (soon)</li> -->
+										</ul>
+									</div>
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+		</div>
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+			<footer>
+				<p>
+					&copy; 2009 &ndash; 2023 <a href="#">Contest Watchers</a>. <a href="#">Some rights reserved</a>.					Powered by <a href="#" target="_blank">WordPress</a>.<br />Designed and developed by <a href="#">Goce Mitevski</a>.
+				</p>
+				<ul>
+					<li><a href="#">Privacy Policy</a></li>
+					<li><a href="#">General Disclaimer</a></li>
+				</ul>
+			</footer>
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+		<button>
+					<span></span>
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+		<button>
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+</div>
+		</div>
+	</div>
+</div>
+
+</body>
+
+</html>
+
diff --git a/tests/wpt/tests/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html b/tests/wpt/tests/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html
new file mode 100644
index 00000000000..7b252f8150f
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/hyphens/i18n/hyphens-i18n-auto-006.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Test: language specific hyphenation—Dutch</title>
+<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#hyphens-property">
+<link rel="match" href="reference/hyphens-i18n-auto-006-ref.html">
+<meta name="assert" content="Depending on the language, the hyphenation character may vary.">
+<style>
+div {
+  font-size: 3em;
+  color: orange;
+}
+.test {
+  width: 6ch;
+  hyphens: auto;
+  color: blue;
+}
+</style>
+
+<p>Test passes if the blue text is identical to the orange text.
+<div lang=cr class=test>ᑲᓯᑕᓂᐘᓂᓂᐠ</div>
+<hr>
+<div lang=cr>ᑲᓯᑕᓂ᐀<br>ᐘᓂᓂᐠ</div>
diff --git a/tests/wpt/tests/css/css-text/hyphens/i18n/reference/hyphens-i18n-auto-006-ref.html b/tests/wpt/tests/css/css-text/hyphens/i18n/reference/hyphens-i18n-auto-006-ref.html
new file mode 100644
index 00000000000..5b960870ca5
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/hyphens/i18n/reference/hyphens-i18n-auto-006-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
+<style>
+div {
+  font-size: 3em;
+  color: orange;
+}
+.test {
+  color: blue;
+}
+</style>
+
+<p>Test passes if the blue text is identical to the orange text.
+<div lang=cr class=test>ᑲᓯᑕᓂ᐀<br>ᐘᓂᓂᐠ</div>
+<hr>
+<div lang=cr>ᑲᓯᑕᓂ᐀<br>ᐘᓂᓂᐠ</div>
diff --git a/tests/wpt/tests/css/css-text/i18n/unknown-lang/css-text-line-break-cj-strict.html b/tests/wpt/tests/css/css-text/i18n/unknown-lang/css-text-line-break-cj-strict.html
index 855d271af96..aa8a8e2d326 100644
--- a/tests/wpt/tests/css/css-text/i18n/unknown-lang/css-text-line-break-cj-strict.html
+++ b/tests/wpt/tests/css/css-text/i18n/unknown-lang/css-text-line-break-cj-strict.html
@@ -15,7 +15,15 @@
     }
 #wrapper { position: relative; }
 .test { color: red; }
-.test, .ref { font-size: 30px; font-family: mplus-1p-regular, sans-serif; width: 185px; padding: 0; border: 1px solid orange; line-height: 1em; }
+.test, .ref {
+    font-size: 30px;
+    font-family: mplus-1p-regular, sans-serif;
+    width: 185px;
+    padding: 0;
+    border: 1px solid orange;
+    line-height: 1em;
+    text-autospace: no-autospace;
+}
 </style>
 <style>
 .test { line-break: strict; }
diff --git a/tests/wpt/tests/css/css-text/line-break/line-break-strict-012.xht b/tests/wpt/tests/css/css-text/line-break/line-break-strict-012.xht
index d01b53f6224..c9f80dd81a3 100644
--- a/tests/wpt/tests/css/css-text/line-break/line-break-strict-012.xht
+++ b/tests/wpt/tests/css/css-text/line-break/line-break-strict-012.xht
@@ -37,6 +37,7 @@
 				border: 1px solid;
 				margin: 10px;
 				padding: 10px;
+        text-autospace: no-autospace;
 			}
 		</style>
 	</head>
diff --git a/tests/wpt/tests/css/css-text/line-break/reference/line-break-strict-012-ref.xht b/tests/wpt/tests/css/css-text/line-break/reference/line-break-strict-012-ref.xht
index fbe2222c72d..c221b0e4404 100644
--- a/tests/wpt/tests/css/css-text/line-break/reference/line-break-strict-012-ref.xht
+++ b/tests/wpt/tests/css/css-text/line-break/reference/line-break-strict-012-ref.xht
@@ -31,6 +31,7 @@
 				border: 1px solid;
 				margin: 10px;
 				padding: 10px;
+        text-autospace: no-autospace;
 			}
 		</style>
 	</head>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-spacing-computed.html b/tests/wpt/tests/css/css-text/parsing/text-spacing-computed.html
new file mode 100644
index 00000000000..f2387919eea
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/parsing/text-spacing-computed.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Text: getComputedStyle().textSpacing</title>
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+test_computed_value("text-spacing", "normal");
+test_computed_value("text-spacing", "none");
+test_computed_value("text-spacing", "auto");
+
+// `text-autospace`.
+test_computed_value("text-spacing", "no-autospace");
+
+// `text-spacing-trim`.
+test_computed_value("text-spacing", "space-first", "normal");
+test_computed_value("text-spacing", "space-all");
+// Two values syntax.
+test_computed_value("text-spacing", "allow-end space-first");
+test_computed_value("text-spacing", "space-first allow-end", "allow-end space-first");
+
+// `text-autospace` and `text-spacing-trim`.
+test_computed_value("text-spacing", "no-autospace space-first", "no-autospace");
+test_computed_value("text-spacing", "no-autospace space-all", "none");
+// Test the reversed order.
+test_computed_value("text-spacing", "space-first no-autospace", "no-autospace");
+test_computed_value("text-spacing", "space-all no-autospace", "none");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-spacing-invalid.html b/tests/wpt/tests/css/css-text/parsing/text-spacing-invalid.html
new file mode 100644
index 00000000000..bd76a064a10
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/parsing/text-spacing-invalid.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Text Module Test: parsing text-spacing with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// These keywords must appear alone.
+for (const keyword of ['normal', 'none', 'auto']) {
+  test_invalid_value("text-spacing", `${keyword} ${keyword}`);
+  for (const keyword2 of ['no-autospace', 'space-first']) {
+    test_invalid_value("text-spacing", `${keyword} ${keyword2}`);
+    test_invalid_value("text-spacing", `${keyword2} ${keyword}`);
+  }
+}
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-spacing-valid.html b/tests/wpt/tests/css/css-text/parsing/text-spacing-valid.html
new file mode 100644
index 00000000000..695fa8bcbb8
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/parsing/text-spacing-valid.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Text Module Test: parsing text-spacing with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-property">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("text-spacing", "normal");
+test_valid_value("text-spacing", "none");
+test_valid_value("text-spacing", "auto");
+
+// `text-autospace`.
+test_valid_value("text-spacing", "no-autospace");
+
+// `text-spacing-trim`.
+test_valid_value("text-spacing", "space-first", "normal");
+test_valid_value("text-spacing", "space-all");
+// Two values syntax.
+test_valid_value("text-spacing", "allow-end space-first");
+test_valid_value("text-spacing", "space-first allow-end", "allow-end space-first");
+
+// `text-autospace` and `text-spacing-trim`.
+test_valid_value("text-spacing", "no-autospace space-first", "no-autospace");
+test_valid_value("text-spacing", "no-autospace space-all", "none");
+// Test the reversed order.
+test_valid_value("text-spacing", "space-first no-autospace", "no-autospace");
+test_valid_value("text-spacing", "space-all no-autospace", "none");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html b/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
index d9ff34eee20..a2eed8c429f 100644
--- a/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
+++ b/tests/wpt/tests/css/css-text/parsing/text-wrap-valid.html
@@ -15,28 +15,28 @@
 test_valid_value("text-wrap", "wrap");
 test_valid_value("text-wrap", "nowrap");
 
-test_valid_value("text-wrap", "auto");
+test_valid_value("text-wrap", "auto", "wrap");
 test_valid_value("text-wrap", "balance");
 test_valid_value("text-wrap", "stable");
 test_valid_value("text-wrap", "pretty");
 
-test_valid_value("text-wrap", "wrap auto");
-test_valid_value("text-wrap", "wrap balance");
-test_valid_value("text-wrap", "wrap pretty");
-test_valid_value("text-wrap", "wrap stable");
-test_valid_value("text-wrap", "auto wrap");
-test_valid_value("text-wrap", "balance wrap");
-test_valid_value("text-wrap", "pretty wrap");
-test_valid_value("text-wrap", "stable wrap");
+test_valid_value("text-wrap", "wrap auto", "wrap");
+test_valid_value("text-wrap", "wrap balance", "balance");
+test_valid_value("text-wrap", "wrap pretty", "pretty");
+test_valid_value("text-wrap", "wrap stable", "stable");
+test_valid_value("text-wrap", "auto wrap", "wrap");
+test_valid_value("text-wrap", "balance wrap", "balance");
+test_valid_value("text-wrap", "pretty wrap", "pretty");
+test_valid_value("text-wrap", "stable wrap", "stable");
 
-test_valid_value("text-wrap", "nowrap auto");
+test_valid_value("text-wrap", "nowrap auto", "nowrap");
 test_valid_value("text-wrap", "nowrap balance");
 test_valid_value("text-wrap", "nowrap pretty");
 test_valid_value("text-wrap", "nowrap stable");
-test_valid_value("text-wrap", "auto nowrap");
-test_valid_value("text-wrap", "balance nowrap");
-test_valid_value("text-wrap", "pretty nowrap");
-test_valid_value("text-wrap", "stable nowrap");
+test_valid_value("text-wrap", "auto nowrap", "nowrap");
+test_valid_value("text-wrap", "balance nowrap", "nowrap balance");
+test_valid_value("text-wrap", "pretty nowrap", "nowrap pretty");
+test_valid_value("text-wrap", "stable nowrap", "nowrap stable");
 
 test_valid_value("text-wrap", "initial");
 test_valid_value("text-wrap", "inherit");
diff --git a/tests/wpt/tests/css/css-text/parsing/white-space-shorthand-text-wrap.html b/tests/wpt/tests/css/css-text/parsing/white-space-shorthand-text-wrap.html
index de6d9f5145d..b99dd19e482 100644
--- a/tests/wpt/tests/css/css-text/parsing/white-space-shorthand-text-wrap.html
+++ b/tests/wpt/tests/css/css-text/parsing/white-space-shorthand-text-wrap.html
@@ -31,17 +31,31 @@ test(() => {
 </script>
 
 <style>
-#white-space-after-text-wrap {
+#white-space-after-text-wrap-balance {
   text-wrap: balance;
   white-space: normal;
 }
 </style>
-<div id="white-space-after-text-wrap"></div>
+<div id="white-space-after-text-wrap-balance"></div>
 <script>
 test(() => {
-  const target = document.getElementById('white-space-after-text-wrap');
-  assert_equals(getComputedStyle(target).textWrap, 'wrap');
-}, "`white-space` should overwrite previous `text-wrap`");
+  const target = document.getElementById('white-space-after-text-wrap-balance');
+  assert_equals(getComputedStyle(target).textWrap, 'balance');
+}, "`white-space` should not overwrite previous `text-wrap-style: balance`");
+</script>
+
+<style>
+#white-space-after-text-wrap-nowrap {
+  text-wrap: nowrap balance;
+  white-space: normal;
+}
+</style>
+<div id="white-space-after-text-wrap-nowrap"></div>
+<script>
+test(() => {
+  const target = document.getElementById('white-space-after-text-wrap-nowrap');
+  assert_equals(getComputedStyle(target).textWrap, 'balance');
+}, "`white-space` should overwrite previous `text-wrap-mode: nowrap`");
 </script>
 
 <style>
@@ -59,12 +73,12 @@ test(() => {
 }, "`text-wrap` should not be affected by `white-space` on the parent");
 </script>
 
-<div class="balance">
+<div style="text-wrap: balance nowrap;">
   <div id="parent-text-wrap" class="normal"></div>
 </div>
 <script>
 test(() => {
   const target = document.getElementById('parent-text-wrap');
-  assert_equals(getComputedStyle(target).textWrap, 'wrap');
-}, "`white-space` should overwrite `text-wrap` on the parent");
+  assert_equals(getComputedStyle(target).textWrap, 'balance');
+}, "`white-space` should overwrite `text-wrap-mode` on the parent");
 </script>
diff --git a/tests/wpt/tests/css/css-text/parsing/white-space-shorthand.html b/tests/wpt/tests/css/css-text/parsing/white-space-shorthand.html
index 01c409a79cd..9cd4bdb43b4 100644
--- a/tests/wpt/tests/css/css-text/parsing/white-space-shorthand.html
+++ b/tests/wpt/tests/css/css-text/parsing/white-space-shorthand.html
@@ -40,7 +40,7 @@ test_valid_and_computed_value("white-space", "wrap preserve-breaks", "pre-line")
 test_valid_and_computed_value("white-space", "preserve-breaks nowrap", "preserve-breaks nowrap");
 test_valid_and_computed_value("white-space", "nowrap preserve-breaks", "preserve-breaks nowrap");
 
-// Values not availabe through the shorthand.
+// Values not available through the shorthand.
 test_invalid_value("white-space", "balance");
 test_invalid_value("white-space", "collapse balance");
 test_invalid_value("white-space", "balance collapse");
diff --git a/tests/wpt/tests/css/css-text/support/get-char-advances.js b/tests/wpt/tests/css/css-text/support/get-char-advances.js
index 846a39a2b76..0fd7332c4ea 100644
--- a/tests/wpt/tests/css/css-text/support/get-char-advances.js
+++ b/tests/wpt/tests/css/css-text/support/get-char-advances.js
@@ -1,25 +1,70 @@
 'use strict';
 
 /**
- * Returns an array of advances (widths) for all characters in the descendants
+ * Returns an array of advances for all characters in the descendants
  * of the specified element.
+ *
+ * Technically speaking, advances and glyph bounding boxes are different things,
+ * and advances are not exposed. This function computes approximate values from
+ * bounding boxes.
  */
 function getCharAdvances(element) {
+  const style = getComputedStyle(element);
+  const is_vertical = style.writingMode.startsWith('vertical');
   const range = document.createRange();
-  let advances = [];
-  for (const node of element.childNodes) {
-    const nodeType = node.nodeType;
-    if (nodeType === Node.TEXT_NODE) {
-      const text = node.nodeValue;
-      for (let i = 0; i < text.length; ++i) {
-        range.setStart(node, i);
-        range.setEnd(node, i + 1);
-        const bounds = range.getBoundingClientRect();
-        advances.push(bounds.width);
+  const all_bounds = []
+
+  function walk(element) {
+    for (const node of element.childNodes) {
+      const nodeType = node.nodeType;
+      if (nodeType === Node.TEXT_NODE) {
+        const text = node.nodeValue;
+        for (let i = 0; i < text.length; ++i) {
+          range.setStart(node, i);
+          range.setEnd(node, i + 1);
+          let bounds = range.getBoundingClientRect();
+          // Transpose if it's in vertical flow. Guarantee that top < bottom
+          // and left < right are always true.
+          if (is_vertical) {
+            bounds = {
+              left: bounds.top,
+              top: bounds.left,
+              right: bounds.bottom,
+              bottom: bounds.right
+            };
+          }
+          all_bounds.push(bounds);
+        }
+      } else if (nodeType === Node.ELEMENT_NODE) {
+        walk(node);
       }
-    } else if (nodeType === Node.ELEMENT_NODE) {
-      advances = advances.concat(getCharAdvances(node));
     }
   }
+  walk(element);
+  all_bounds.sort(function(bound_a, bound_b) {
+    if (bound_a.bottom <= bound_b.top) {
+      return -1;
+    }
+    if (bound_b.bottom <= bound_a.top) {
+      return 1;
+    }
+    return bound_a.left - bound_b.left;
+  });
+  let origin = undefined;
+  let blockEnd = -1;
+  const advances = [];
+  for (let bounds of all_bounds) {
+    // Check if this is on the same line.
+    if (bounds.top >= blockEnd) {
+      origin = undefined;
+      blockEnd = bounds.bottom;
+    }
+    // For the first character, the left bound is closest to the origin.
+    if (origin === undefined)
+      origin = bounds.left;
+    // The right bound is a good approximation of the next origin.
+    advances.push(bounds.right - origin);
+    origin = bounds.right;
+  }
   return advances;
 }
diff --git a/tests/wpt/tests/css/css-text/tab-size/tab-size-computed-value-001.html b/tests/wpt/tests/css/css-text/tab-size/tab-size-computed-value-001.html
index 885a8c7a867..e0946135ac7 100644
--- a/tests/wpt/tests/css/css-text/tab-size/tab-size-computed-value-001.html
+++ b/tests/wpt/tests/css/css-text/tab-size/tab-size-computed-value-001.html
@@ -40,7 +40,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, specified_value, expected_value)
     {
 
     test(function()
@@ -60,10 +60,10 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
-    function compareValueCloseTo(property_name, specified_value, epsilon, expected_value, description)
+    function compareValueCloseTo(property_name, specified_value, epsilon, expected_value)
     {
 
     test(function()
@@ -83,60 +83,60 @@
 
       assert_array_approx_equals(computedSpecifiedValue, computedExpectedValue, epsilon);
 
-    } , description);
+    }, `testing ${property_name}: ${specified_value}`);
 
   }
 
-    verifyComputedStyle("tab-size", "4", "4", "testing tab-size: 4");
+    verifyComputedStyle("tab-size", "4", "4");
 
- /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value) */
 
   /* absolute length units: in, cm, mm, pt, pc, Q, px */
 
-    verifyComputedStyle("tab-size", "0.5in", "48px", "testing tab-size: 0.5in");
+    verifyComputedStyle("tab-size", "0.5in", "48px");
 
-    verifyComputedStyle("tab-size", "2.54cm", "96px", "testing tab-size: 2.54cm");
+    verifyComputedStyle("tab-size", "2.54cm", "96px");
 
-    verifyComputedStyle("tab-size", "25.4mm", "96px", "testing tab-size: 25.4mm");
+    verifyComputedStyle("tab-size", "25.4mm", "96px");
 
-    verifyComputedStyle("tab-size", "18pt", "24px", "testing tab-size: 18pt");
+    verifyComputedStyle("tab-size", "18pt", "24px");
 
-    verifyComputedStyle("tab-size", "5pc", "80px", "testing tab-size: 5pc");
+    verifyComputedStyle("tab-size", "5pc", "80px");
 
-    verifyComputedStyle("tab-size", "101.6Q", "96px", "testing tab-size: 101.6Q");
+    verifyComputedStyle("tab-size", "101.6Q", "96px");
 
-    verifyComputedStyle("tab-size", "7px", "7px", "testing tab-size: 7px");
+    verifyComputedStyle("tab-size", "7px", "7px");
 
- /* verifyComputedStyle(property_name, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, specified_value, expected_value) */
 
   /* relative length units: em, ex, rem */
 
-    verifyComputedStyle("tab-size", "1em", "20px", "testing tab-size: 1em");
+    verifyComputedStyle("tab-size", "1em", "20px");
 
- /* compareValueCloseTo(property_name, specified_value, epsilon, expected_value, description)  */
+ /* compareValueCloseTo(property_name, specified_value, epsilon, expected_value)  */
 
-    compareValueCloseTo("tab-size", "2ex", 0.001, "32px", "testing tab-size: 2ex");
+    compareValueCloseTo("tab-size", "2ex", 0.001, "32px");
 
     /*
     For this sub-test, we set the tolerance precision (epsilon)
     to (0.001 === 1 thousandth).
     */
 
-    verifyComputedStyle("tab-size", "3rem", "48px", "testing tab-size: 3rem");
+    verifyComputedStyle("tab-size", "3rem", "48px");
 
   /*
 
   NOT tested are: vw, vh, vmin, vmax and ch units
 
-    verifyComputedStyle("tab-size", "4vw", "?px", "testing tab-size: 4vw");
+    verifyComputedStyle("tab-size", "4vw", "?px");
 
-    verifyComputedStyle("tab-size", "5vh", "?px", "testing tab-size: 5vh");
+    verifyComputedStyle("tab-size", "5vh", "?px");
 
-    verifyComputedStyle("tab-size", "6vmin", "?px", "testing tab-size: 6vmin");
+    verifyComputedStyle("tab-size", "6vmin", "?px");
 
-    verifyComputedStyle("tab-size", "7vmax", "?px", "testing tab-size: 7vmax");
+    verifyComputedStyle("tab-size", "7vmax", "?px");
 
-    verifyComputedStyle("tab-size", "8ch", "?px", "testing tab-size: 8ch");
+    verifyComputedStyle("tab-size", "8ch", "?px");
 
   */
 
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-break-001.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-break-001.html
index 337d3c7624f..003833c387b 100644
--- a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-break-001.html
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-break-001.html
@@ -7,7 +7,7 @@
 .test-container {
   font-family: Ahem;
   font-size: 40px;
-  width: 4.5em;
+  width: 4em;
 }
 .test > span {
   outline: 1px solid blue;
diff --git a/tests/wpt/tests/css/css-text/text-autospace/text-autospace-mixed-001.html b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-mixed-001.html
new file mode 100644
index 00000000000..731f74561aa
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-autospace/text-autospace-mixed-001.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-autospace-property">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/get-char-advances.js"></script>
+<style>
+.test {
+  font-family: Ahem;
+  font-size: 40px;
+}
+.no-autospace {
+  text-autospace: no-autospace;
+}
+</style>
+<div id="container">
+  <div class="test" expect="1,5">国国&#x5d0;&#x5d1;&#x5d2;国国</div>
+  <div class="test" expect="1,5">国国<span>&#x5d0;&#x5d1;</span>&#x5d2;国国</div>
+  <div class="test" expect="1,11">国国&#1605;&#1615;&#1585;&#1614;&#1576;&#1614;&#1617;&#1593;&#1618;国国</div>
+</div>
+<script>
+// Compute expected advances from advances without `text-autospace` and the
+// `expect` attribute.
+const container = document.getElementById('container');
+container.classList.add('no-autospace');
+const tests = [];
+for (const element of document.getElementsByClassName('test')) {
+  const em = parseFloat(getComputedStyle(element).fontSize);
+  const spacing = em / 8;
+  const advances = getCharAdvances(element);
+  const expect = element.getAttribute('expect').split(',').map(i => parseInt(i));
+  for (const i of expect) {
+    advances[i] += spacing;
+  }
+  tests.push({element: element, advances: advances});
+}
+
+// Apply `text-autospace` and compare the actual advances.
+container.classList.remove('no-autospace');
+for (const t of tests) {
+  const advances = getCharAdvances(t.element);
+  test(() => {
+    assert_array_equals(advances, t.advances);
+  })
+}
+</script>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-class.js b/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-class.js
index d1ca547cfd7..28cf85ff9f6 100644
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-class.js
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-class.js
@@ -10,4 +10,8 @@ if (window.location.search) {
                          .flatMap(value => value.split(','));
     document.documentElement.classList.add(...values);
   }
+  const lang = params.get('lang');
+  if (lang) {
+    document.documentElement.lang = lang;
+  }
 }
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-feature.js b/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-feature.js
new file mode 100644
index 00000000000..4fee3e43c54
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/support/variant-feature.js
@@ -0,0 +1,16 @@
+'use strict';
+
+/**
+ * Add `style` and `feature` search params to the `style` attribute.
+ */
+if (window.location.search) {
+  const params = new URLSearchParams(window.location.search);
+  const styles = params.getAll('style');
+  const features = params.getAll('feature');
+  for (const feature of features) {
+    styles.push(`font-feature-settings: '${feature}'`);
+  }
+  if (styles.length) {
+    document.documentElement.style = styles.join(';');
+  }
+}
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001-ref.html
similarity index 100%
rename from tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-001-ref.html
rename to tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001-ref.html
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001.html
index 28f11c62261..b34cd0a5507 100644
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001.html
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-001.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
-<link rel="match" href="reference/text-spacing-trim-001-ref.html">
+<link rel="match" href="text-spacing-trim-001-ref.html">
 <meta name="variant" content="?class=halt,htb">
 <meta name="variant" content="?class=chws,htb">
 <meta name="variant" content="?class=halt,vrl">
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-colon-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001-ref.html
similarity index 100%
rename from tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-colon-001-ref.html
rename to tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001-ref.html
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html
index 31df6093b95..a36f6a369b9 100644
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
-<link rel="match" href="reference/text-spacing-trim-colon-001-ref.html">
+<link rel="match" href="text-spacing-trim-colon-001-ref.html">
 <meta name="variant" content="?class=halt,htb">
 <meta name="variant" content="?class=chws,htb">
 <meta name="variant" content="?class=halt,vrl">
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html
new file mode 100644
index 00000000000..78c47f51d6a
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-combinations-001.html
@@ -0,0 +1,147 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<!--
+  Test patterns are from "Fullwidth Punctuation Collapsing":
+  https://drafts.csswg.org/css-text-4/#fullwidth-collapsing
+-->
+<meta name="variant" content="?class=htb&test=CC:HF">
+<meta name="variant" content="?class=htb&test=CM:HF">
+<meta name="variant" content="?class=htb&test=CO:FH">
+<meta name="variant" content="?class=htb&test=MO:FH">
+<meta name="variant" content="?class=htb&test=OO:FH">
+<meta name="variant" content="?class=vrl&test=CC:HF">
+<meta name="variant" content="?class=vrl&test=CM:HF">
+<meta name="variant" content="?class=vrl&test=CO:FH">
+<meta name="variant" content="?class=vrl&test=MO:FH">
+<meta name="variant" content="?class=vrl&test=OO:FH">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/variant-class.js"></script>
+<script src="../support/get-char-advances.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+}
+.vrl #container {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="log"></div>
+<div id="container"></div>
+<script>
+const classes = {
+  // Open. Noto CJK doesn't have these glyphs or `halt`/`valt`:
+  // \u3008\u301A\u3010\uFF3B
+  'O': '\u300A\u300C\u300E\u3014\u3016\u3018\u301D' +
+       '\uFF08\uFF5B\uFF5F',
+  // Close. Noto CJK doesn't have these glyphs or `halt`/`valt`:
+  // \u3009\u301B\u3011\u301E\uFF3D
+  'C': '\u300B\u300D\u300F\u3015\u3017\u3019\u301F' +
+       '\uFF09\uFF5D\uFF60',
+  // Open Quotes.
+  'Q': '\u2018\u201C',
+  // Close quotes.
+  'R': '\u2019\u201D',
+  // Middle and ideographic space.
+  'M': '\u30FB\u3000',
+  // Dot (comma and full stops.)
+  'D': '\u3001\u3002\uFF0C\uFF0E',
+  // Colon.
+  'L': '\uFF1A',
+  // Semicolon. Colon and Semicolon may be different in vertical flow.
+  'S': '\uFF1B',
+  // Exclamation marks.
+  'E': '\uFF01\uFF1F',
+};
+const container = document.getElementById('container');
+const em = parseInt(getComputedStyle(container).fontSize);
+const threshold = em * .8;
+
+// Generate a list of text from a pattern.
+// For example, a pattern 'OC' generates all combinations from
+// characters in `classes['O']` and `classes['C']`.
+function* textFromPattern(pattern, prefix = '') {
+  const key = pattern[0];
+  const rest = pattern.substr(1);
+  for (const ch of classes[key]) {
+    if (!rest) {
+      yield prefix + ch;
+      continue;
+    }
+    yield *textFromPattern(rest, prefix + ch);
+  }
+}
+
+class TestData {
+  constructor(text, expect) {
+    const element = document.createElement('div');
+    element.textContent = text;
+    this.text = text;
+    this.element = element;
+    this.expect = expect;
+  }
+
+  static all = [];
+
+  static generate(pattern, expect, container) {
+    for (const text of textFromPattern(pattern)) {
+      const data = new TestData(text, expect);
+      container.appendChild(data.element);
+      TestData.all.push(data);
+    }
+  }
+
+  static runAll(indices) {
+    if (indices && indices.length) {
+      for (const index of indices) {
+        TestData.all[index].run(index);
+      }
+      return;
+    }
+    TestData.all.forEach((data, i) => {
+      data.run(i);
+    })
+  }
+
+  run(index) {
+    const advances = getCharAdvances(this.element);
+    const results = advances.map(advance => advance >= threshold ? 'F' : 'H');
+    const result = results.join('');
+    test(() => {
+      assert_equals(result, this.expect);
+    }, `${index}: ${this.text}`);
+  }
+}
+
+setup(() => {
+  assert_implements(CSS.supports('text-spacing-trim', 'initial'));
+}, {explicit_done: true});
+(async function () {
+  const params = new URLSearchParams(window.location.search);
+  const style= getComputedStyle(container);
+  const is_vertical = style.writingMode.startsWith('vertical');
+
+  // Assign dots and colons using the Noto's Japanese convention.
+  classes['C'] += classes['D'];
+  classes['M'] += classes['L'];
+  if (!is_vertical) classes['M'] += classes['S'];
+
+  const args = params.getAll('test').flatMap(i => i.split(','));
+  for (const arg of args) {
+    const [pattern, expect] = arg.split(':');
+    TestData.generate(pattern, expect, container);
+  }
+
+  await document.fonts.ready;
+  const indices = params.getAll('i').flatMap(i => i.split(','))
+                        .map(i => parseInt(i));
+  TestData.runAll(indices);
+  done();
+})();
+</script>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-dot-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001-ref.html
similarity index 100%
rename from tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-dot-001-ref.html
rename to tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001-ref.html
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html
index 4ce1e047771..721a585f7c6 100644
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
-<link rel="match" href="reference/text-spacing-trim-dot-001-ref.html">
+<link rel="match" href="text-spacing-trim-dot-001-ref.html">
 <meta name="variant" content="?class=halt,htb">
 <meta name="variant" content="?class=chws,htb">
 <meta name="variant" content="?class=halt,vrl">
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001-ref.html
new file mode 100644
index 00000000000..86b61e06407
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="support/variant-class.js"></script>
+<script src="support/variant-feature.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+  text-spacing-trim: space-all;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="container">
+  <div><span>国）（国国（（国（国</span></div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001.html
new file mode 100644
index 00000000000..25ddad34aee
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-feature-001.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<link rel="match" href="text-spacing-trim-feature-001-ref.html">
+<meta name="variant" content="?class=htb&feature=halt">
+<meta name="variant" content="?class=htb&feature=hwid">
+<meta name="variant" content="?class=htb&feature=palt">
+<meta name="variant" content="?class=htb&feature=pwid">
+<meta name="variant" content="?class=htb&style=font-variant-east-asian:proportional-width">
+<meta name="variant" content="?class=vrl&feature=vhal">
+<meta name="variant" content="?class=vrl&feature=vpal">
+<meta name="variant" content="?class=vrl&style=font-variant-east-asian:proportional-width">
+<script src="support/variant-class.js"></script>
+<script src="support/variant-feature.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+@font-face {
+  font-family: chws-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+}
+.chws #container {
+  font-family: chws-font;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="container">
+  <div><span>国）（国国（（国（国</span></div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001-ref.html
new file mode 100644
index 00000000000..0aef32b5538
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+halt {
+  font-feature-settings: 'halt' 1, 'vhal' 1;
+}
+</style>
+<div id="container">
+  <div>国<halt>）</halt>)国</div>
+  <div>国）(国</div>
+  <div>国(<halt>（国</halt></div>
+  <div>国)（国</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001.html
new file mode 100644
index 00000000000..cd906770f8e
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-narrow-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<link rel="match" href="text-spacing-trim-narrow-001-ref.html">
+<meta name="variant" content="?class=halt,htb">
+<meta name="variant" content="?class=chws,htb">
+<meta name="variant" content="?class=halt,vrl">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+@font-face {
+  font-family: chws-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+}
+.chws #container {
+  font-family: chws-font;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="container">
+  <div>国）)国</div>
+  <div>国）(国</div>
+  <div>国(（国</div>
+  <div>国)（国</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001-ref.html
new file mode 100644
index 00000000000..47f953cfcaf
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001-ref.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+  text-spacing-trim: space-all;
+}
+.vrl {
+  writing-mode: vertical-rl;
+  text-orientation: upright;
+}
+halt {
+  font-feature-settings: 'halt' 1, 'vhal' 1;
+}
+if-zh { display: none; }
+:root:lang(zh-hans), :root:lang(zh-hant) {
+  if-ja { display: none; }
+  if-zh { display: block; }
+}
+</style>
+<div id="container">
+  <div>国）<halt>‘（</halt>国</div>
+  <div>国）<halt>“（</halt>国</div>
+  <if-ja>
+    <div>国<halt>）</halt>’（国</div>
+    <div>国<halt>）</halt>”（国</div>
+  </if-ja>
+  <if-zh>
+    <div>国<halt>）</halt>’<halt>（</halt>国</div>
+    <div>国<halt>）</halt>”<halt>（</halt>国</div>
+  </if-zh>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001.html
new file mode 100644
index 00000000000..a8bc462bad4
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-quote-001.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<link rel="match" href="text-spacing-trim-quote-001-ref.html">
+<meta name="variant" content="?class=halt,htb&lang=ja">
+<meta name="variant" content="?class=halt,htb&lang=zh-hans">
+<meta name="variant" content="?class=halt,htb&lang=zh-hant">
+<meta name="variant" content="?class=halt,vrl&lang=zh-hans">
+<meta name="variant" content="?class=halt,vrl&lang=zh-hant">
+<meta name="variant" content="?class=chws,htb&lang=zh-hans">
+<meta name="variant" content="?class=chws,htb&lang=zh-hant">
+<meta name="variant" content="?class=chws,vrl&lang=zh-hans">
+<meta name="variant" content="?class=chws,vrl&lang=zh-hant">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+@font-face {
+  font-family: chws-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+}
+.chws #container {
+  font-family: chws-font;
+}
+.vrl {
+  writing-mode: vertical-rl;
+  text-orientation: upright;
+}
+</style>
+<div id="container">
+  <div>国）‘（国</div>
+  <div>国）“（国</div>
+  <div>国）’（国</div>
+  <div>国）”（国</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-trim-all-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001-ref.html
similarity index 100%
rename from tests/wpt/tests/css/css-text/text-spacing-trim/reference/text-spacing-trim-trim-all-001-ref.html
rename to tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001-ref.html
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001.html
index daec2fc4d23..ca2b1ccd038 100644
--- a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001.html
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-trim-all-001.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
 <link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
-<link rel="match" href="reference/text-spacing-trim-trim-all-001-ref.html">
+<link rel="match" href="text-spacing-trim-trim-all-001-ref.html">
 <meta name="variant" content="?class=halt,htb">
 <meta name="variant" content="?class=chws,htb">
 <meta name="variant" content="?class=halt,vrl">
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001-ref.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001-ref.html
new file mode 100644
index 00000000000..5295bdc34ff
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+  inline-size: 4em;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+halt {
+  font-feature-settings: 'halt' 1, 'vhal' 1;
+}
+</style>
+<div id="container">
+  <div>（国国国<halt>（</halt>国国国<halt>（</halt>国</div>
+  <div>国国国国<halt>（</halt></div>
+  <div lang="zh-hans">国国国国<halt>“</halt></div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html
new file mode 100644
index 00000000000..76af819d79c
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-001.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<link rel="match" href="text-spacing-trim-wrap-001-ref.html">
+<meta name="variant" content="?class=halt,htb">
+<meta name="variant" content="?class=chws,htb">
+<meta name="variant" content="?class=halt,vrl">
+<meta name="variant" content="?class=chws,vrl">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+@font-face {
+  font-family: chws-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+  inline-size: 4em;
+}
+.chws #container {
+  font-family: chws-font;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="container">
+  <div>（国国国（国国国（国</div>
+  <div>国国国国（</div>
+  <div lang="zh-hans">国国国国“</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html
new file mode 100644
index 00000000000..017443976f8
--- /dev/null
+++ b/tests/wpt/tests/css/css-text/text-spacing-trim/text-spacing-trim-wrap-br-001.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://drafts.csswg.org/css-text-4/#text-spacing-trim-property">
+<link rel="match" href="text-spacing-trim-wrap-001-ref.html">
+<meta name="variant" content="?class=halt,htb">
+<meta name="variant" content="?class=chws,htb">
+<meta name="variant" content="?class=halt,vrl">
+<meta name="variant" content="?class=chws,vrl">
+<script src="support/variant-class.js"></script>
+<style>
+@font-face {
+  font-family: halt-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf');
+}
+@font-face {
+  font-family: chws-font;
+  src: url('/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf');
+}
+#container {
+  font-family: halt-font;
+  font-size: 20px;
+  inline-size: 4em;
+}
+.chws #container {
+  font-family: chws-font;
+}
+.vrl {
+  writing-mode: vertical-rl;
+}
+</style>
+<div id="container">
+  <div>（国国国<br>（国国国<br>（国</div>
+  <div>国国国国<br>（</div>
+  <div lang="zh-hans">国国国国<br>“</div>
+</div>
diff --git a/tests/wpt/tests/css/css-text/word-spacing/word-spacing-computed-001.html b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-computed-001.html
index a641fc23533..84d1fcf1e5a 100644
--- a/tests/wpt/tests/css/css-text/word-spacing/word-spacing-computed-001.html
+++ b/tests/wpt/tests/css/css-text/word-spacing/word-spacing-computed-001.html
@@ -30,7 +30,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, specified_value, expected_value)
     {
 
     test(function()
@@ -50,32 +50,32 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
-    verifyComputedStyle("word-spacing", "normal", "0px", "testing word-spacing: normal");
+    verifyComputedStyle("word-spacing", "normal", "0px");
 
-    verifyComputedStyle("word-spacing", "0", "0px", "testing word-spacing: 0");
+    verifyComputedStyle("word-spacing", "0", "0px");
 
-    verifyComputedStyle("word-spacing", "1.27cm", "48px", "testing word-spacing: 1.27cm");
+    verifyComputedStyle("word-spacing", "1.27cm", "48px");
 
-    verifyComputedStyle("word-spacing", "1em", "20px", "testing word-spacing: 1em");
+    verifyComputedStyle("word-spacing", "1em", "20px");
 
-    verifyComputedStyle("word-spacing", "0.5in", "48px", "testing word-spacing: 0.5in");
+    verifyComputedStyle("word-spacing", "0.5in", "48px");
 
-    verifyComputedStyle("word-spacing", "25.4mm", "96px", "testing word-spacing: 25.4mm");
+    verifyComputedStyle("word-spacing", "25.4mm", "96px");
 
-    verifyComputedStyle("word-spacing", "5pc", "80px", "testing word-spacing: 5pc");
+    verifyComputedStyle("word-spacing", "5pc", "80px");
 
-    verifyComputedStyle("word-spacing", "18pt", "24px", "testing word-spacing: 18pt");
+    verifyComputedStyle("word-spacing", "18pt", "24px");
 
-    verifyComputedStyle("word-spacing", "7px", "7px", "testing word-spacing: 7px");
+    verifyComputedStyle("word-spacing", "7px", "7px");
 
-    verifyComputedStyle("word-spacing", "101.6Q", "96px", "testing word-spacing: 101.6Q");
+    verifyComputedStyle("word-spacing", "101.6Q", "96px");
 
-    verifyComputedStyle("word-spacing", "3rem", "48px", "testing word-spacing: 3rem");
+    verifyComputedStyle("word-spacing", "3rem", "48px");
 
-    verifyComputedStyle("word-spacing", "0ch", "0px", "testing word-spacing: 0ch");
+    verifyComputedStyle("word-spacing", "0ch", "0px");
 
   }
 
diff --git a/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes-ref.html b/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes-ref.html
new file mode 100644
index 00000000000..e3cf99f9f21
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Animating both the "scale" and "rotate" property</title>
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#individual-transforms">
+
+<style>
+
+#target {
+    position: absolute;
+    width: 100px;
+    height: 100px;
+    background-color: black;
+
+    transform-origin: bottom left;
+    rotate: 90deg;
+}
+
+</style>
+</head>
+<body>
+<div id="target"></div>
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html b/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html
new file mode 100644
index 00000000000..708bfa49666
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/animation/scale-and-rotate-both-specified-on-animation-keyframes.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+<title>Animating both the "scale" and "rotate" property</title>
+<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#individual-transforms">
+<link rel="match" href="scale-and-rotate-both-specified-on-animation-keyframes-ref.html">
+
+<style>
+
+@keyframes scale-and-rotate-animation {
+    0%      { scale: 1.5; rotate: 0deg; }
+    0.001%  { scale: 1; rotate: 90deg; }
+    100%    { scale: 1; rotate: 90deg; }
+}
+
+#target {
+    position: absolute;
+    width: 100px;
+    height: 100px;
+    background-color: black;
+
+    transform-origin: bottom left;
+    animation: scale-and-rotate-animation linear 100s;
+}
+
+</style>
+</head>
+<body>
+<div id="target"></div>
+
+<script>
+
+(async function() {
+    // We need to wait for the animation to have started and progressed for one frame
+    // before taking the snapshot.
+    await Promise.all(document.getAnimations().map(animation => animation.ready));
+    await new Promise(requestAnimationFrame);
+    document.documentElement.classList.remove("reftest-wait");
+})();
+
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/css/css-transforms/backface-visibility-hidden-animated-002.html b/tests/wpt/tests/css/css-transforms/backface-visibility-hidden-animated-002.html
new file mode 100644
index 00000000000..b3029f9e465
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/backface-visibility-hidden-animated-002.html
@@ -0,0 +1,53 @@
+<!doctype html>
+<html class=reftest-wait>
+  <link rel="author" title="Xianzhu Wang" href="mailto:wangxianzhu@chromium.org">
+  <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-backface-visibility">
+  <link rel="match" href="backface-visibility-hidden-animated-ref.html">
+  <style>
+    @keyframes show-backface {
+      0% { transform: rotateY(60deg); }
+      0.01% { transform: rotateY(180deg); }
+      100% { transform: rotateY(180deg); }
+    }
+
+    .flip {
+      animation: 10s linear 0s infinite forwards show-backface;
+      height: 100px;
+      width: 100px;
+      transform: rotateY(60deg);
+      transform-style: preserve-3d;
+    }
+
+    #back {
+      background: lightblue;
+      transform: rotateY(180deg);
+      position: absolute;
+      top: 0;
+      left: 0;
+      width: 200px;
+      height: 200px;
+      backface-visibility: hidden;
+    }
+
+    #posabs {
+      position: absolute;
+      /* This is the only difference from backface-visibility-hidden-animated-001.html. */
+      will-change: transform;
+      bottom: 0;
+      right: 0;
+      background: yellow;
+    }
+  </style>
+  <div id="flip">
+    <div id="back">
+      <i id="posabs">Text</i>
+    </div>
+  </div>
+  <script>
+    onload = () => requestAnimationFrame(() => requestAnimationFrame(() => {
+      flip.classList.add("flip");
+      requestAnimationFrame(() => requestAnimationFrame(() =>
+          document.documentElement.classList.remove("reftest-wait")));
+    }));
+  </script>
+</html>
diff --git a/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-perspective.html b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-perspective.html
new file mode 100644
index 00000000000..c91e6f725f9
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-perspective.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>CSS Test (Transforms): composited under rotateY(180deg)</title>
+<link rel="help" href="http://www.w3.org/TR/css-transforms-2">
+<meta name="assert" content="This tests that a composited element with default
+  backface-visibility is visible under rotateY(180deg) and perspective,
+  and invisible under rotateY(180deg), perspective and backface-visibility:hidden.">
+<link rel="match" href="composited-under-rotateY-180deg-ref.html">
+<div style="transform: rotateY(180deg); width: 100px; perspective: 10px">
+  <div style="width: 100px; height: 100px; background: green; will-change: transform"></div>
+</div>
+<div style="transform: rotateY(180deg); width: 100px; backface-visibility: hidden; perspective: 10px">
+  <div style="width: 100px; height: 100px; background: red; will-change: transform"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html
new file mode 100644
index 00000000000..282d0b1c95a
--- /dev/null
+++ b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg-preserve-3d.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<title>CSS Test (Transforms): composited under backface-visibility:hidden, rotateY(180deg) and preserve-3d</title>
+<link rel="help" href="http://www.w3.org/TR/css-transforms-2">
+<meta name="assert" content="This tests that a composited element with default
+  backface-visibility is visible under backface-visibility:hidden, rotateY(180deg) and preserve-3d.">
+<link rel="match" href="composited-under-rotateY-180deg-ref.html">
+<div style="transform: rotateY(180deg); width: 100px; backface-visibility: hidden; transform-style: preserve-3d">
+  <div style="width: 100px; height: 100px; background: green; will-change: transform"></div>
+</div>
diff --git a/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg.html b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg.html
index 01ff42a98f4..674cc4492fc 100644
--- a/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg.html
+++ b/tests/wpt/tests/css/css-transforms/composited-under-rotateY-180deg.html
@@ -2,7 +2,7 @@
 <title>CSS Test (Transforms): composited under rotateY(180deg)</title>
 <link rel="help" href="http://www.w3.org/TR/css-transforms-2">
 <meta name="assert" content="This tests that a composited element with default
-  backface-visibility is visible under rotateY(180deg).">
+  backface-visibility is visible under rotateY(180deg), and invisible under rotateY(180deg) and backface-visibility:hidden.">
 <link rel="match" href="composited-under-rotateY-180deg-ref.html">
 <div style="transform: rotateY(180deg); width: 100px">
   <div style="width: 100px; height: 100px; background: green; will-change: transform"></div>
diff --git a/tests/wpt/tests/css/css-transforms/transform-translate-background-001-ref.html b/tests/wpt/tests/css/css-transforms/transform-translate-background-001-ref.html
index 03aebe11448..495ba7a3c7e 100644
--- a/tests/wpt/tests/css/css-transforms/transform-translate-background-001-ref.html
+++ b/tests/wpt/tests/css/css-transforms/transform-translate-background-001-ref.html
@@ -6,9 +6,6 @@
 <style>
   html {
     background: green;
-    /* Match scrollbar change caused by translateY transformation */
-    margin-top: -250vh;
   }
 </style>
-<div style="height: 400vh;"></div>
 </html>
diff --git a/tests/wpt/tests/css/css-transforms/transform-translate-background-001.html b/tests/wpt/tests/css/css-transforms/transform-translate-background-001.html
index bd14ebc25ee..00fefeb6e8d 100644
--- a/tests/wpt/tests/css/css-transforms/transform-translate-background-001.html
+++ b/tests/wpt/tests/css/css-transforms/transform-translate-background-001.html
@@ -11,6 +11,7 @@
   html {
     background: linear-gradient(to bottom, green 0%, green 50%, red 50%, red 100%);
     transform: translate(0, -250vh);
+    overflow: hidden;
   }
 </style>
 <div style="height: 400vh;"></div>
diff --git a/tests/wpt/tests/css/css-transforms/transform-translate-background-002.html b/tests/wpt/tests/css/css-transforms/transform-translate-background-002.html
index d714af2d07b..9551ec51ad1 100644
--- a/tests/wpt/tests/css/css-transforms/transform-translate-background-002.html
+++ b/tests/wpt/tests/css/css-transforms/transform-translate-background-002.html
@@ -11,6 +11,7 @@
 <style>
   html {
     background: linear-gradient(to bottom, green 0%, green 50%, red 50%, red 100%);
+    overflow: hidden;
   }
 </style>
 <div style="height: 400vh;"></div>
diff --git a/tests/wpt/tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html b/tests/wpt/tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html
index dfb6e087183..87fb9efa103 100644
--- a/tests/wpt/tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html
+++ b/tests/wpt/tests/css/css-typed-om/the-stylepropertymap/properties/white-space.html
@@ -22,9 +22,13 @@ runPropertyTests('white-space-collapse', [
   { syntax: 'break-spaces' },
 ]);
 
-runPropertyTests('text-wrap', [
+runPropertyTests('text-wrap-mode', [
   { syntax: 'wrap'},
   { syntax: 'nowrap' },
+]);
+
+runPropertyTests('text-wrap-style', [
+  { syntax: 'auto' },
   { syntax: 'balance' },
   { syntax: 'stable' },
   { syntax: 'pretty' },
@@ -42,6 +46,6 @@ runUnsupportedPropertyTests('white-space-trim', [
   'discard-before discard-inner',
   'discard-after discard-inner',
   'discard-before discard-after discard-inner'
-])
+]);
 
 </script>
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html b/tests/wpt/tests/css/css-ui/parsing/field-sizing-computed.html
similarity index 72%
rename from tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html
rename to tests/wpt/tests/css/css-ui/parsing/field-sizing-computed.html
index e508cd2050e..02853032b37 100644
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-computed.html
+++ b/tests/wpt/tests/css/css-ui/parsing/field-sizing-computed.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<title>CSS UI: getComputedStyle().formSizing</title>
+<title>CSS UI: getComputedStyle().fieldSizing</title>
 <link rel="help" href="https://github.com/w3c/csswg-drafts/pull/9251">
 <link rel="author" title="Kent Tamura" href="mailto:tkent@chromium.org">
 <script src="/resources/testharness.js"></script>
@@ -8,7 +8,7 @@
 <body>
 <div id="target"></div>
 <script>
-test_computed_value('form-sizing', 'fixed');
-test_computed_value('form-sizing', 'content');
+test_computed_value('field-sizing', 'fixed');
+test_computed_value('field-sizing', 'content');
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-ui/parsing/field-sizing-invalid.html b/tests/wpt/tests/css/css-ui/parsing/field-sizing-invalid.html
new file mode 100644
index 00000000000..58091a7f2bc
--- /dev/null
+++ b/tests/wpt/tests/css/css-ui/parsing/field-sizing-invalid.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<title>CSS UI: parsing field-sizing with invalid values</title>
+<link rel="help" href="https://github.com/w3c/csswg-drafts/pull/9251">
+<link rel="author" title="Kent Tamura" href="mailto:tkent@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<body>
+<script>
+test_invalid_value('field-sizing', 'none');
+test_invalid_value('field-sizing', 'legacy');
+test_invalid_value('field-sizing', 'auto');
+test_invalid_value('field-sizing', 'normal');
+test_invalid_value('field-sizing', 'normal auto');
+test_invalid_value('field-sizing', '100%');
+test_invalid_value('field-sizing', '10px');
+</script>
+</body>
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html b/tests/wpt/tests/css/css-ui/parsing/field-sizing-valid.html
similarity index 70%
rename from tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html
rename to tests/wpt/tests/css/css-ui/parsing/field-sizing-valid.html
index d9d39f79132..148b8c40288 100644
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-valid.html
+++ b/tests/wpt/tests/css/css-ui/parsing/field-sizing-valid.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<title>CSS UI: parsing form-sizing with valid values</title>
+<title>CSS UI: parsing field-sizing with valid values</title>
 <link rel="help" href="https://github.com/w3c/csswg-drafts/pull/9251">
 <link rel="author" title="Kent Tamura" href="mailto:tkent@chromium.org">
 <script src="/resources/testharness.js"></script>
@@ -7,7 +7,7 @@
 <script src="/css/support/parsing-testcommon.js"></script>
 <body>
 <script>
-test_valid_value('form-sizing', 'fixed');
-test_valid_value('form-sizing', 'content');
+test_valid_value('field-sizing', 'fixed');
+test_valid_value('field-sizing', 'content');
 </script>
 </body>
diff --git a/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html b/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html
deleted file mode 100644
index 5589707b25e..00000000000
--- a/tests/wpt/tests/css/css-ui/parsing/form-sizing-invalid.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<!DOCTYPE html>
-<title>CSS UI: parsing form-sizing with invalid values</title>
-<link rel="help" href="https://github.com/w3c/csswg-drafts/pull/9251">
-<link rel="author" title="Kent Tamura" href="mailto:tkent@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-<body>
-<script>
-test_invalid_value('form-sizing', 'none');
-test_invalid_value('form-sizing', 'legacy');
-test_invalid_value('form-sizing', 'auto');
-test_invalid_value('form-sizing', 'normal');
-test_invalid_value('form-sizing', 'normal auto');
-test_invalid_value('form-sizing', '100%');
-test_invalid_value('form-sizing', '10px');
-</script>
-</body>
diff --git a/tests/wpt/tests/css/css-values/calc-background-position-002.html b/tests/wpt/tests/css/css-values/calc-background-position-002.html
index 249cdc3d5e3..2196bf281e5 100644
--- a/tests/wpt/tests/css/css-values/calc-background-position-002.html
+++ b/tests/wpt/tests/css/css-values/calc-background-position-002.html
@@ -21,7 +21,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value)
     {
 
     test(function()
@@ -42,20 +42,20 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
- /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value) */
 
-    verifyComputedStyle("background-position", "initial", "calc(2px + 3px) calc(4px + 5px)", "5px 9px", "testing background-position: calc(2px + 3px) calc(4px + 5px)");
+    verifyComputedStyle("background-position", "initial", "calc(2px + 3px) calc(4px + 5px)", "5px 9px");
 
-    verifyComputedStyle("background-position", "initial", "calc(18px - 7px) calc(19px - 7px)", "11px 12px", "testing background-position: calc(18px - 7px) calc(19px - 7px)");
+    verifyComputedStyle("background-position", "initial", "calc(18px - 7px) calc(19px - 7px)", "11px 12px");
 
-    verifyComputedStyle("background-position", "initial", "calc(4 * 5px) calc(6px * 4)", "20px 24px", "testing background-position: calc(4 * 5px) calc(6px * 4)");
+    verifyComputedStyle("background-position", "initial", "calc(4 * 5px) calc(6px * 4)", "20px 24px");
 
-    verifyComputedStyle("background-position", "initial", "calc(100px / 4) calc(119px / 7)", "25px 17px", "testing background-position: calc(100px / 4) calc(119px / 7)");
+    verifyComputedStyle("background-position", "initial", "calc(100px / 4) calc(119px / 7)", "25px 17px");
 
-    verifyComputedStyle("background-position", "initial", "calc(6px + 21%) calc(7em + 22%)", "calc(21% + 6px) calc(22% + 112px)", "testing background-position: calc(6px + 21%) calc(7em + 22%)");
+    verifyComputedStyle("background-position", "initial", "calc(6px + 21%) calc(7em + 22%)", "calc(21% + 6px) calc(22% + 112px)");
 
   /*
     "
@@ -67,9 +67,9 @@
     https://www.w3.org/TR/css-values-3/#calc-computed-value
   */
 
-    verifyComputedStyle("background-position", "initial", "calc(-8px + 23%) calc(-9em + 24%)", "calc(23% - 8px) calc(24% - 144px)", "testing background-position: calc(-8px + 23%) calc(-9em + 24%)");
+    verifyComputedStyle("background-position", "initial", "calc(-8px + 23%) calc(-9em + 24%)", "calc(23% - 8px) calc(24% - 144px)");
 
- /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value) */
   }
 
   startTesting();
diff --git a/tests/wpt/tests/css/css-values/calc-complex-sign-function-crash.html b/tests/wpt/tests/css/css-values/calc-complex-sign-function-crash.html
new file mode 100644
index 00000000000..d890c8cdd1a
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/calc-complex-sign-function-crash.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<div style="width: calc((1rem + 1px) * (sign(10px - 1%) + 1));"></div>
diff --git a/tests/wpt/tests/css/css-values/calc-in-media-queries-with-mixed-units.html b/tests/wpt/tests/css/css-values/calc-in-media-queries-with-mixed-units.html
index f94df62f284..c007fd053f6 100644
--- a/tests/wpt/tests/css/css-values/calc-in-media-queries-with-mixed-units.html
+++ b/tests/wpt/tests/css/css-values/calc-in-media-queries-with-mixed-units.html
@@ -7,18 +7,24 @@
     <link rel="help" href="https://www.w3.org/TR/css3-values/#calc-computed-value">
   </head>
   <body>
-    <iframe src="./support/mixed-units-01.html" title="px/em" frameborder="0" height="10" width="100"></iframe>
-    <iframe src="./support/mixed-units-02.html" title="vh/em" frameborder="0" height="10" width="100"></iframe>
-    <iframe src="./support/mixed-units-03.html" title="vw/em" frameborder="0" height="10" width="100"></iframe>
-    <iframe src="./support/mixed-units-04.html" title="vw/vh" frameborder="0" height="10" width="100"></iframe>
-    <iframe src="./support/mixed-units-05.html" title="vh/px" frameborder="0" height="10" width="100"></iframe>
-    <iframe src="./support/mixed-units-06.html" title="vw/px" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-01.html" title="px-em" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-02.html" title="vh+em" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-03.html" title="vw-em" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-04.html" title="vw+vh" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-05.html" title="vh+px" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-06.html" title="vw+px" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-07.html" title="px/em*em" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-08.html" title="vh*em" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-09.html" title="vh*vw/em*px/vh" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-10.html" title="vw/px*vh" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-11.html" title="vh*vw/em*px" frameborder="0" height="10" width="100"></iframe>
+    <iframe src="./support/mixed-units-12.html" title="vw*vh*px*em/px/px/px" frameborder="0" height="10" width="100"></iframe>
     <script>
       for (const frame of document.querySelectorAll("iframe")) {
         async_test((t) => {
           frame.addEventListener("load", t.step_func(() => {
-            const box = frame.contentWindow.document.querySelector(".box");
-            const actual = frame.contentWindow.getComputedStyle(box).getPropertyValue("background-color");
+            const body = frame.contentWindow.document.body;
+            const actual = frame.contentWindow.getComputedStyle(body).getPropertyValue("background-color");
             assert_equals(actual, "rgb(255, 165, 0)");
             t.done();
           }));
diff --git a/tests/wpt/tests/css/css-values/calc-linear-radial-conic-gradient-001.html b/tests/wpt/tests/css/css-values/calc-linear-radial-conic-gradient-001.html
index ded5f0c37e2..3a4dd3cd7f9 100644
--- a/tests/wpt/tests/css/css-values/calc-linear-radial-conic-gradient-001.html
+++ b/tests/wpt/tests/css/css-values/calc-linear-radial-conic-gradient-001.html
@@ -40,7 +40,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, specified_value, expected_value)
     {
 
     test(function()
@@ -61,48 +61,42 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
- /* verifyComputedStyle(property_name, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, specified_value, expected_value) */
 
     /* LINEAR */
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(rgb(0, 128, 0) calc(0%), rgb(0, 0, 255))",
-    "linear-gradient(rgb(0, 128, 0) 0%, rgb(0, 0, 255))",
-    "testing background-image: linear-gradient(rgb(0, 128, 0) calc(0%), rgb(0, 0, 255))");
+    "linear-gradient(rgb(0, 128, 0) 0%, rgb(0, 0, 255))");
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(calc(90deg), rgb(0, 128, 0), rgb(0, 0, 255))",
-    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))",
-    "testing background-image: linear-gradient(calc(90deg), rgb(0, 128, 0), rgb(0, 0, 255))");
+    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))");
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(calc(90deg), rgb(0, 128, 0) calc(0%), rgb(0, 0, 255))",
-    "linear-gradient(90deg, rgb(0, 128, 0) 0%, rgb(0, 0, 255))",
-    "testing background-position: linear-gradient(calc(90deg), rgb(0, 128, 0) calc(0%), rgb(0, 0, 255))");
+    "linear-gradient(90deg, rgb(0, 128, 0) 0%, rgb(0, 0, 255))");
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(calc(0.1turn + 0.15turn), rgb(0, 128, 0), rgb(0, 0, 255))",
-    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))",
-    "testing background-image: linear-gradient(calc(0.1turn + 0.15turn), rgb(0, 128, 0), rgb(0, 0, 255))");
+    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))");
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(calc(150grad - 50grad), rgb(0, 128, 0), rgb(0, 0, 255))",
-    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))",
-    "testing background-image: linear-gradient(calc(150grad - 50grad), rgb(0, 128, 0), rgb(0, 0, 255))");
+    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))");
 
     verifyComputedStyle(
     "background-image",
     "linear-gradient(calc(200grad - 90deg), rgb(0, 128, 0), rgb(0, 0, 255))",
-    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))",
-    "testing background-image: linear-gradient(calc(200grad - 90deg), rgb(0, 128, 0), rgb(0, 0, 255))");
+    "linear-gradient(90deg, rgb(0, 128, 0), rgb(0, 0, 255))");
 
 
     /* RADIAL */
@@ -110,8 +104,7 @@
     verifyComputedStyle(
     "background-image",
     "radial-gradient(rgb(0, 128, 0) calc(10% + 20%), rgb(0, 0, 255) calc(30% + 40%))",
-    "radial-gradient(rgb(0, 128, 0) 30%, rgb(0, 0, 255) 70%)",
-    "testing background-image: radial-gradient(rgb(0, 128, 0) calc(10% + 20%), rgb(0, 0, 255) calc(30% + 40%))");
+    "radial-gradient(rgb(0, 128, 0) 30%, rgb(0, 0, 255) 70%)");
 
 
     /* CONIC */
@@ -119,10 +112,9 @@
     verifyComputedStyle(
     "background-image",
     "conic-gradient(rgb(0, 128, 0) calc(50% + 10%), rgb(0, 0, 255) calc(60% + 20%))",
-    "conic-gradient(rgb(0, 128, 0) 60%, rgb(0, 0, 255) 80%)",
-    "testing background-image: conic-gradient(rgb(0, 128, 0) calc(50% + 10%), rgb(0, 0, 255) calc(60% + 20%))");
+    "conic-gradient(rgb(0, 128, 0) 60%, rgb(0, 0, 255) 80%)");
 
- /* verifyComputedStyle(property_name, specified_value, expected_value, description) */
+ /* verifyComputedStyle(property_name, specified_value, expected_value) */
 
   }
 
diff --git a/tests/wpt/tests/css/css-values/calc-serialization-002.html b/tests/wpt/tests/css/css-values/calc-serialization-002.html
index 79159480b9b..28a7de5cdab 100644
--- a/tests/wpt/tests/css/css-values/calc-serialization-002.html
+++ b/tests/wpt/tests/css/css-values/calc-serialization-002.html
@@ -118,6 +118,31 @@
 
  /* verifySerialization(specified_value, serialization_expected, description)  */
 
+    /*
+
+    Check distributing multiplication over sums and subs simplification.
+    NOTE: If root contains only two children, one of which is a number
+    (not a percentage or dimension) and the other of which is a Sum
+    whose children are all numeric values, multiply all of the Sum’s
+    children by the number, then return the Sum. So, num * (fn + fn)
+    should not be simplified.
+
+    */
+
+    verifySerialization("calc(2 * (10px + 1rem))", "calc(20px + 2rem)", "testing calc(2 * (10px + 1rem))");
+    verifySerialization("calc(2 * (10px - 1rem))", "calc(20px - 2rem)", "testing calc(2 * (10px - 1rem))");
+    verifySerialization("calc((10px + 1rem) / 2)", "calc(5px + 0.5rem)", "testing calc((10px + 1rem) / 2)");
+    verifySerialization(
+      "calc(2 * (min(10px, 20%) + max(1rem, 2%)))",
+      "calc(2 * (min(10px, 20%) + max(1rem, 2%)))",
+      "testing calc(2 * (min(10px, 20%) + max(1rem, 2%)))"
+    );
+    verifySerialization(
+      "calc((min(10px, 20%) + max(1rem, 2%)) * 2)",
+      "calc((min(10px, 20%) + max(1rem, 2%)) * 2)",
+      "testing calc((min(10px, 20%) + max(1rem, 2%)) * 2)"
+    );
+
     verifySerialization("calc(1vmin - 14%)", "calc(-14% + 1vmin)", "testing calc(1vmin - 14%)");
 
 
diff --git a/tests/wpt/tests/css/css-values/calc-z-index-fractions-001.html b/tests/wpt/tests/css/css-values/calc-z-index-fractions-001.html
index caa75ea7842..d5b97821d90 100644
--- a/tests/wpt/tests/css/css-values/calc-z-index-fractions-001.html
+++ b/tests/wpt/tests/css/css-values/calc-z-index-fractions-001.html
@@ -21,7 +21,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, initial_value, specified_value, expected_value)
     {
 
     test(function()
@@ -42,16 +42,16 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
- /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value, description) */
-    verifyComputedStyle("z-index", "auto", "calc(2.5 / 2)", "1", "testing z-index: calc(2.5 / 2)");
-    verifyComputedStyle("z-index", "auto", "calc(3 / 2)", "2", "testing z-index: calc(3 / 2)");
-    verifyComputedStyle("z-index", "auto", "calc(3.5 / 2)", "2", "testing z-index: calc(3.5 / 2)");
-    verifyComputedStyle("z-index", "auto", "calc(-2.5 / 2)", "-1", "testing z-index: calc(-2.5 / 2)");
-    verifyComputedStyle("z-index", "auto", "calc(-3 / 2)", "-1", "testing z-index: calc(-3 / 2)");
-    verifyComputedStyle("z-index", "auto", "calc(-3.5 / 2)", "-2", "testing z-index: calc(-3.5 / 2)");
+ /* verifyComputedStyle(property_name, initial_value, specified_value, expected_value) */
+    verifyComputedStyle("z-index", "auto", "calc(2.5 / 2)", "1");
+    verifyComputedStyle("z-index", "auto", "calc(3 / 2)", "2");
+    verifyComputedStyle("z-index", "auto", "calc(3.5 / 2)", "2");
+    verifyComputedStyle("z-index", "auto", "calc(-2.5 / 2)", "-1");
+    verifyComputedStyle("z-index", "auto", "calc(-3 / 2)", "-1");
+    verifyComputedStyle("z-index", "auto", "calc(-3.5 / 2)", "-2");
   }
 
   startTesting();
diff --git a/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-001.html b/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-001.html
index 6f3ba3ac477..a0693e852b4 100644
--- a/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-001.html
+++ b/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-001.html
@@ -46,7 +46,7 @@ https://chromium.googlesource.com/chromium/src/+/c825d655f6aaf73484f9d56e9012793
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, expected_value, description)
+    function verifyComputedStyle(property_name, expected_value)
     {
 
     test(function()
@@ -54,20 +54,20 @@ https://chromium.googlesource.com/chromium/src/+/c825d655f6aaf73484f9d56e9012793
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${expected_value}`);
     }
 
- /* verifyComputedStyle(property_name, expected_value, description) */
+ /* verifyComputedStyle(property_name, expected_value) */
 
-    verifyComputedStyle("border-top-left-radius", "calc(25% + 10px) calc(25% + 20px)", "testing border-top-left-radius: calc(10px + 25%) calc(20px + 25%)");
+    verifyComputedStyle("border-top-left-radius", "calc(25% + 10px) calc(25% + 20px)");
 
-    verifyComputedStyle("border-top-right-radius", "calc(25% + 16px)", "testing border-top-right-radius: calc(1em + 25%)");
+    verifyComputedStyle("border-top-right-radius", "calc(25% + 16px)");
 
-    verifyComputedStyle("border-bottom-right-radius", "25%", "testing border-bottom-right-radius: calc(25%)");
+    verifyComputedStyle("border-bottom-right-radius", "25%");
 
-    verifyComputedStyle("border-bottom-left-radius", "25px", "testing border-bottom-left-radius: calc(25px);");
+    verifyComputedStyle("border-bottom-left-radius", "25px");
 
-    verifyComputedStyle("border-radius", "calc(25% + 10px) calc(25% + 16px) 25% 25px / calc(25% + 20px) calc(25% + 16px) 25% 25px", "testing border-radius shorthand");
+    verifyComputedStyle("border-radius", "calc(25% + 10px) calc(25% + 16px) 25% 25px / calc(25% + 20px) calc(25% + 16px) 25% 25px");
 
   /*
 
diff --git a/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-003.html b/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-003.html
index 98d320bca28..cc60eb6d828 100644
--- a/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-003.html
+++ b/tests/wpt/tests/css/css-values/getComputedStyle-border-radius-003.html
@@ -40,7 +40,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, expected_value, description)
+    function verifyComputedStyle(property_name, expected_value)
     {
 
     test(function()
@@ -48,12 +48,12 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${expected_value}`);
     }
 
- /* verifyComputedStyle(property_name, expected_value, description) */
+ /* verifyComputedStyle(property_name, expected_value) */
 
-    verifyComputedStyle("border-radius", "calc(1% + 1px) calc(2% + 2px) calc(3% + 3px) calc(4% + 4px) / calc(5% + 5px) calc(6% + 6px) calc(7% + 7px) calc(8% + 8px)", "testing border-radius shorthand");
+    verifyComputedStyle("border-radius", "calc(1% + 1px) calc(2% + 2px) calc(3% + 3px) calc(4% + 4px) / calc(5% + 5px) calc(6% + 6px) calc(7% + 7px) calc(8% + 8px)");
 
   /*
 
diff --git a/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-001.html b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-001.html
index 4b8ec04188d..a44b70ab472 100644
--- a/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-001.html
+++ b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-001.html
@@ -54,7 +54,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, specified_value, expected_value)
     {
 
     test(function()
@@ -64,10 +64,10 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
-    verifyComputedStyle("background-size", "calc(67% - 54% + 4em) 50%", "calc(13% + 64px) 50%", "testing background-size: calc(67% - 54% + 4em) 50%");
+    verifyComputedStyle("background-size", "calc(67% - 54% + 4em) 50%", "calc(13% + 64px) 50%");
 
     /*
     "Where percentages are not resolved at computed-value time,
@@ -79,7 +79,7 @@
     must be resolved though.
     */
 
-    verifyComputedStyle("background-position", "calc(100% - 100% + 20em)", "calc(0% + 320px) 50%", "testing background-position: calc(100% - 100% + 20em)");
+    verifyComputedStyle("background-position", "calc(100% - 100% + 20em)", "calc(0% + 320px) 50%");
 
     /*
     Here too, the percentage is preserved and
@@ -88,7 +88,7 @@
     */
 
 
-    verifyComputedStyle("height", "calc(60% - 50% + 3em)", "105px", "testing height: calc(60% - 50% + 3em)");
+    verifyComputedStyle("height", "calc(60% - 50% + 3em)", "105px");
 
     /*
 
diff --git a/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-002.html b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-002.html
index 4be8c292b18..cf98b1c59ec 100644
--- a/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-002.html
+++ b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-002.html
@@ -65,7 +65,7 @@
 
   var targetElement = document.getElementById("target");
 
-    function verifyComputedStyle(property_name, specified_value, expected_value, description)
+    function verifyComputedStyle(property_name, specified_value, expected_value)
     {
 
     test(function()
@@ -77,10 +77,10 @@
 
       assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
 
-      }, description);
+      }, `testing ${property_name}: ${specified_value}`);
     }
 
-    verifyComputedStyle("width", "calc(10% + 2em)", "84px", "testing width: calc(10% + 2em)");
+    verifyComputedStyle("width", "calc(10% + 2em)", "84px");
 
     /*
 
@@ -97,7 +97,7 @@
     */
 
 
-    verifyComputedStyle("width", "calc(5% + 4rem)", "146px", "testing width: calc(5% + 4rem)");
+    verifyComputedStyle("width", "calc(5% + 4rem)", "146px");
 
     /*
 
@@ -114,7 +114,7 @@
     */
 
 
-    verifyComputedStyle("width", "calc(8lh + 7px)", "167px", "testing width: calc(8lh + 7px)");
+    verifyComputedStyle("width", "calc(8lh + 7px)", "167px");
 
     /*
 
@@ -131,7 +131,7 @@
     */
 
 
-    verifyComputedStyle("height", "calc(10% + 6pt)", "58px", "testing height: calc(10% + 6pt)");
+    verifyComputedStyle("height", "calc(10% + 6pt)", "58px");
 
     /*
 
@@ -148,7 +148,7 @@
     */
 
 
-    verifyComputedStyle("width", "calc(4em + 2.6458333cm)", "164px", "testing width: calc(4em + 2.6458333cm)");
+    verifyComputedStyle("width", "calc(4em + 2.6458333cm)", "164px");
 
     /*
 
@@ -165,7 +165,7 @@
     */
 
 
-    verifyComputedStyle("height", "calc(5em + 26.458333mm)", "180px", "testing height: calc(5em + 26.458333mm)");
+    verifyComputedStyle("height", "calc(5em + 26.458333mm)", "180px");
 
     /*
 
@@ -182,7 +182,7 @@
     */
 
 
-    verifyComputedStyle("width", "calc(2in + 101.6Q)", "288px", "testing width: calc(2in + 101.6Q)");
+    verifyComputedStyle("width", "calc(2in + 101.6Q)", "288px");
 
     /*
 
@@ -199,7 +199,7 @@
     */
 
 
-    verifyComputedStyle("height", "calc(1pc + 3pt)", "20px", "testing height: calc(1pc + 3pt)");
+    verifyComputedStyle("height", "calc(1pc + 3pt)", "20px");
 
     /*
 
diff --git a/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-003.html b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-003.html
new file mode 100644
index 00000000000..fae9682b2c0
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/getComputedStyle-calc-mixed-units-003.html
@@ -0,0 +1,88 @@
+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Values Test: computed value of calc() values using multiplication/division with mixed units</title>
+
+  <link rel="help" href="https://www.w3.org/TR/css-values-4/#calc-computed-value">
+
+  <meta name="flags" content="">
+  <meta content="This meta-test checks for the resolution and absolutization of computed values with mixed units to 'px' when multiplication/division is used." name="assert">
+
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+
+  <style>
+  html {
+      font-size: 30px;
+  }
+
+  body {
+      font-size: 16px;
+      line-height: 1.25; /* computed value: 20px */
+      width: 520px;
+      height: 500px;
+      margin: 20px;
+  }
+
+  div#target {
+      height: 100px;
+      width: 100px;
+  }
+  </style>
+
+  <div id="target"></div>
+
+  <script>
+  function startTesting() {
+    var targetElement = document.getElementById("target");
+
+    function verifyComputedStyle(property_name, specified_value, expected_value) {
+      test(function() {
+        targetElement.style.setProperty(property_name, "initial");
+        targetElement.style.setProperty(property_name, specified_value);
+        assert_equals(getComputedStyle(targetElement)[property_name], expected_value);
+      }, `testing ${property_name}: ${specified_value}`);
+    }
+
+    verifyComputedStyle("width", "calc(5px * 10lh / 1px)", "1000px");
+    /*
+      10lh = 200px
+      5px * 200px / 1px = 1000px^2 / 1px = 1000px
+      Total = 1000px
+    */
+
+    verifyComputedStyle("width", "calc(20% * 0.5em / 1px)", "832px");
+    /*
+      20% of 520px = 104px
+      0.5em = 8px
+      104px * 8px / 1px = 832px^2 / 1px = 832px
+      Total = 832px
+    */
+
+    verifyComputedStyle("width", "calc(4px * 4em / 1px)", "256px");
+    /*
+      4em = 64px
+      4px * 64px / 1px = 256px^2 / 1px = 256px
+      Total = 256px
+    */
+
+    verifyComputedStyle("width", "calc(400px / 4lh * 1px)", "5px");
+    /*
+      4lh = 80px
+      400px / 80px * 1px = 5 * 1px = 5px
+      Total = 5px
+    */
+
+    verifyComputedStyle("width", "calc(20% / 0.5em * 1px)", "13px");
+    /*
+      20% of 520px = 104px
+      0.5em = 8px
+      104px / 8px * 1px = 13 * 1px = 13px
+      Total = 13px
+    */
+  }
+
+  startTesting();
+
+  </script>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-01.html b/tests/wpt/tests/css/css-values/support/mixed-units-01.html
index 6401cd9b4bd..1969d10b46c 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-01.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-01.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (width: calc(116px - 1em)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-02.html b/tests/wpt/tests/css/css-values/support/mixed-units-02.html
index 67088c64c59..cbef4633981 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-02.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-02.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (width: calc(200vh + 5em)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-03.html b/tests/wpt/tests/css/css-values/support/mixed-units-03.html
index 3d614d395ac..0a22fcb5e71 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-03.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-03.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (height: calc(100vw - 5.625em)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-04.html b/tests/wpt/tests/css/css-values/support/mixed-units-04.html
index b23c0e6a7fa..5c3560aaf94 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-04.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-04.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (width: calc(10vw + 900vh)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-05.html b/tests/wpt/tests/css/css-values/support/mixed-units-05.html
index e6196d3e31f..d1a71b73e4e 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-05.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-05.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (width: calc(900vh + 10px)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-06.html b/tests/wpt/tests/css/css-values/support/mixed-units-06.html
index a4a614f8d2e..787de9746b9 100644
--- a/tests/wpt/tests/css/css-values/support/mixed-units-06.html
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-06.html
@@ -3,21 +3,14 @@
   <head>
     <style>
       body {
-        margin: 0;
-        font-size: 16px;
-      }
-      .box {
         background: rgb(0, 0, 255);
-        width: 100%;
-        height: 10px;
       }
-
       @media (width: calc(90vw + 10px)) {
-        .box {
+        body {
           background: rgb(255, 165, 0);
         }
       }
     </style>
   </head>
-  <div class="box"></div>
+  <body></body>
 </html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-07.html b/tests/wpt/tests/css/css-values/support/mixed-units-07.html
new file mode 100644
index 00000000000..bd4bd4aecf4
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-07.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (width: calc(100px / 1em * 1em)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-08.html b/tests/wpt/tests/css/css-values/support/mixed-units-08.html
new file mode 100644
index 00000000000..1ae1d0c30c6
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-08.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (width: calc((50vh * 5em) / 4px)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-09.html b/tests/wpt/tests/css/css-values/support/mixed-units-09.html
new file mode 100644
index 00000000000..ee078c95dfe
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-09.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (height: calc(50vw / 0.3125em * 10px)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-10.html b/tests/wpt/tests/css/css-values/support/mixed-units-10.html
new file mode 100644
index 00000000000..43a4fd02f4b
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-10.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (width: calc(10vw / 10px * 1000vh)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-11.html b/tests/wpt/tests/css/css-values/support/mixed-units-11.html
new file mode 100644
index 00000000000..1d63c899d84
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-11.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (width: calc(8000vh * 1vw / 1em * 8px / 40vh)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-values/support/mixed-units-12.html b/tests/wpt/tests/css/css-values/support/mixed-units-12.html
new file mode 100644
index 00000000000..bb623ff3ec5
--- /dev/null
+++ b/tests/wpt/tests/css/css-values/support/mixed-units-12.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style>
+      body {
+        background: rgb(0, 0, 255);
+      }
+      @media (width: calc(100vw * 10vh * 1px * 0.0625em / 1px / 1px / 1px)) {
+        body {
+          background: rgb(255, 165, 0);
+        }
+      }
+    </style>
+  </head>
+  <body></body>
+</html>
diff --git a/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated-ref.html b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated-ref.html
new file mode 100644
index 00000000000..d3f1dffacdc
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>View transitions: capture with backdrop filter on the element (ref)</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+<style>
+.box {
+  background: green;
+  width: 100px;
+  height: 100px;
+}
+#target {
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  backdrop-filter: grayscale(0.5);
+}
+</style>
+
+<div class=box></div>
+<div id=target></div>
diff --git a/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated.html b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated.html
new file mode 100644
index 00000000000..3a5f0665b00
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-animated.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>View transitions: captured backdrop filter on the element animates</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+<link rel="match" href="backdrop-filter-animated-ref.html">
+<script src="/common/reftest-wait.js"></script>
+<style>
+.box {
+  background: green;
+  width: 100px;
+  height: 100px;
+}
+#target {
+  view-transition-name: target;
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  backdrop-filter: grayscale(1);
+}
+#target.after {
+  backdrop-filter: grayscale(0);
+}
+
+html::view-transition-group(*) {
+  animation-duration: 1s;
+  animation-timing-function: linear;
+  animation-play-state: paused;
+}
+html::view-transition-new(*) { animation: unset; opacity: 1; }
+html::view-transition-old(*) { animation: unset; opacity: 0; }
+</style>
+<div class=box></div>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+async function runTest() {
+  let transition = document.startViewTransition(() => target.classList.add("after"));
+  transition.ready.then(() => {
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      document.getAnimations().forEach((animation) => {
+        animation.currentTime = 500;
+      });
+      requestAnimationFrame(takeScreenshot);
+    }));
+  });
+}
+onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured-ref.html b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured-ref.html
new file mode 100644
index 00000000000..4defa6b90d7
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured-ref.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>View transitions: capture with backdrop filter on the element (ref)</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+<style>
+.box {
+  background: green;
+  width: 100px;
+  height: 100px;
+}
+#target {
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  backdrop-filter: grayscale(1);
+}
+</style>
+
+<div class=box></div>
+<div id=target></div>
diff --git a/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured.html b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured.html
new file mode 100644
index 00000000000..d42a197a309
--- /dev/null
+++ b/tests/wpt/tests/css/css-view-transitions/backdrop-filter-captured.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>View transitions: capture with backdrop filter on the element</title>
+<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
+<link rel="author" href="mailto:vmpstr@chromium.org">
+<link rel="match" href="backdrop-filter-captured-ref.html">
+<script src="/common/reftest-wait.js"></script>
+<style>
+.box {
+  background: green;
+  width: 100px;
+  height: 100px;
+}
+#target {
+  view-transition-name: target;
+  width: 50px;
+  height: 50px;
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  backdrop-filter: grayscale(1);
+}
+
+html::view-transition-group(*) { animation-duration: 300s; }
+html::view-transition-new(*) { animation: unset; opacity: 1; }
+html::view-transition-old(*) { animation: unset; opacity: 0; }
+</style>
+<div class=box></div>
+<div id=target></div>
+
+<script>
+failIfNot(document.startViewTransition, "Missing document.startViewTransition");
+
+async function runTest() {
+  document.startViewTransition().ready.then(takeScreenshot);
+}
+onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
+</script>
+</html>
diff --git a/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html b/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html
index 1b160946f5c..a6e26b6c48b 100644
--- a/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html
+++ b/tests/wpt/tests/css/css-writing-modes/forms/select-multiple-keyboard-selection.optional.html
@@ -23,6 +23,13 @@ const arrow_up = "\uE013";
 const arrow_right = "\uE014";
 const arrow_down = "\uE015";
 
+async function sendKeyEventAndWait(key) {
+  await test_driver.send_keys(document.activeElement, key);
+  // Engines differ in when the scrolling is applied so wait for a frame to be
+  // rendered.
+  await new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
+}
+
 for (const writingMode of ["horizontal-tb", "vertical-lr", "vertical-rl", "sideways-lr", "sideways-rl"]) {
     if (!CSS.supports(`writing-mode: ${writingMode}`))
         continue;
@@ -54,16 +61,16 @@ for (const writingMode of ["horizontal-tb", "vertical-lr", "vertical-rl", "sidew
 
         assert_equals(document.activeElement, select);
 
-        await test_driver.send_keys(document.activeElement, previousKey);
+        await sendKeyEventAndWait(previousKey);
         assert_equals(select.value, "Option 1");
         assert_equals(select[scrollBlockAxis], 0);
 
-        await test_driver.send_keys(document.activeElement, nextKey);
+        await sendKeyEventAndWait(nextKey);
         assert_equals(select.value, "Option 2");
         assert_equals(select[scrollBlockAxis], 0);
 
         for (let i = 0; i < select.size - 1; i++) {
-            await test_driver.send_keys(document.activeElement, nextKey);
+            await sendKeyEventAndWait(nextKey);
         }
 
         assert_equals(select.value, "Option 5");
@@ -74,7 +81,7 @@ for (const writingMode of ["horizontal-tb", "vertical-lr", "vertical-rl", "sidew
             assert_true(select[scrollBlockAxis] < 0);
         }
 
-        await test_driver.send_keys(document.activeElement, previousKey);
+        await sendKeyEventAndWait(previousKey);
         assert_equals(select.value, "Option 4");
 
         if (!isReversedBlockFlowDirection) {
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100-ref.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100-ref.html
index 26e2cb79e5c..d5f1d566278 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100-ref.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100-ref.html
@@ -14,6 +14,7 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: mixed;
+    text-autospace: no-autospace;
 }
 .line {
     white-space: pre;
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100.html
index 9e577f1565f..e2f2bedb1c3 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vlr-100.html
@@ -16,7 +16,8 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: mixed;
-}
+    text-autospace: no-autospace;
+  }
 .line {
     white-space: pre;
 }
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100-ref.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100-ref.html
index 77de6727813..15d74eb2467 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100-ref.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100-ref.html
@@ -14,6 +14,7 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: mixed;
+    text-autospace: no-autospace;
 }
 .line {
     white-space: pre;
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100.html
index 183217dd737..355857463df 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-mixed-vrl-100.html
@@ -16,6 +16,7 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: mixed;
+    text-autospace: no-autospace;
 }
 .line {
     white-space: pre;
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vlr-100.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vlr-100.html
index a3b73bb218d..2060c865ca5 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vlr-100.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vlr-100.html
@@ -16,6 +16,7 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: sideways;
+    text-autospace: no-autospace;
 }
 .line {
     white-space: pre;
diff --git a/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vrl-100.html b/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vrl-100.html
index 52355db103c..ada168e27b8 100644
--- a/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vrl-100.html
+++ b/tests/wpt/tests/css/css-writing-modes/text-orientation-sideways-vrl-100.html
@@ -16,6 +16,7 @@ html {
     font: 20px/1 "orientation";
     height: 17em;
     text-orientation: sideways;
+    text-autospace: no-autospace;
 }
 .line {
     white-space: pre;
diff --git a/tests/wpt/tests/css/cssom-view/checkVisibility.html b/tests/wpt/tests/css/cssom-view/checkVisibility.html
index 3ab1cc7dc2e..c0146dc14e1 100644
--- a/tests/wpt/tests/css/cssom-view/checkVisibility.html
+++ b/tests/wpt/tests/css/cssom-view/checkVisibility.html
@@ -16,14 +16,30 @@
 
 <div id=displaynone style="display:none">hello</div>
 
+<div style="display:none" class="shadow-host-with-slot">
+  <div id="slottedindisplaynone" slot="slot">slotted</div>
+</div>
+
+<div id=displaycontents style="display:contents">
+  <div id=displaycontentschild>hello</div>
+</div>
+
 <div id=opacityzero style="opacity:0">hello</div>
 
+<div style="opacity:0" class="shadow-host-with-slot">
+  <div id="slottedinopacityzero" slot="slot">slotted</div>
+</div>
+
 <div style="content-visibility:hidden">
   <div id=cvhiddenchildwithupdate></div>
 </div>
 
 <div style="content-visibility:hidden" id=cvhiddenwithupdate></div>
 
+<div style="content-visibility:hidden" class="shadow-host-with-slot">
+  <div id="slottedincvhidden" slot="slot">slotted</div>
+</div>
+
 <div style="height:10000px">spacer</div>
 
 <div style="content-visibility:auto">
@@ -41,6 +57,13 @@
 </div>
 
 <script>
+for (const host of document.querySelectorAll(".shadow-host-with-slot")) {
+  const shadowRoot = host.attachShadow({ mode: "open" });
+  const slot = document.createElement("slot");
+  slot.name = "slot";
+  shadowRoot.appendChild(slot);
+}
+
 test(() => {
   assert_false(visibilityhidden.checkVisibility({
     checkVisibilityCSS: true
@@ -54,6 +77,10 @@ test(() => {
   assert_false(cvhidden.checkVisibility());
 }, 'checkVisibility on content-visibility:hidden element.');
 
+test(() => {
+  assert_false(slottedincvhidden.checkVisibility());
+}, 'checkVisibility on element slotted in content-visibility: hidden shadow host.');
+
 test(() => {
   assert_true(cvauto.checkVisibility());
 }, 'checkVisibility on content-visibility:auto element.');
@@ -66,6 +93,15 @@ test(() => {
   assert_false(displaynone.checkVisibility());
 }, 'checkVisibility on display:none element.');
 
+test(() => {
+  assert_false(slottedindisplaynone.checkVisibility());
+}, 'checkVisibility on element slotted in display:none shadow host.');
+
+test(() => {
+  assert_false(displaycontents.checkVisibility());
+  assert_true(displaycontentschild.checkVisibility());
+}, 'checkVisibility on display:contents element.');
+
 test(() => {
   assert_false(opacityzero.checkVisibility({
     checkOpacity: true
@@ -75,6 +111,15 @@ test(() => {
   }), 'checkOpacity:false');
 }, 'checkVisibility on opacity:0 element.');
 
+test(() => {
+  assert_false(slottedinopacityzero.checkVisibility({
+    checkOpacity: true
+  }), 'checkOpacity: true');
+  assert_true(slottedinopacityzero.checkVisibility({
+    checkOpacity: false
+  }), 'checkOpacity: true');
+}, 'checkVisibility on element slotted in opacity: 0; shadow host.');
+
 test(() => {
   cvautocontainer.style.contentVisibility = 'auto';
   cvautochild.style.visibility = 'hidden';
diff --git a/tests/wpt/tests/css/cssom/getComputedStyle-insets-multicol-absolute-crash.html b/tests/wpt/tests/css/cssom/getComputedStyle-insets-multicol-absolute-crash.html
new file mode 100644
index 00000000000..81b0b88be11
--- /dev/null
+++ b/tests/wpt/tests/css/cssom/getComputedStyle-insets-multicol-absolute-crash.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<title>Chromium bug: getComputedStyle() crashes with inset properties on abspos in multicol</title>
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1473508">
+<style>
+html {
+  column-count:2;
+}
+body {
+  transform: scale(1);
+}
+div#test {
+  column-count:2;
+  position:absolute;
+}
+</style>
+
+<div id="test">
+  <svg xmlns="http://www.w3.org/2000/svg"></svg>
+  <div style="transform: scale(1)">
+    <ruby style="position: absolute">
+      <rt>foo</rt>
+    </ruby>
+  </div>
+</div>
+
+<script>
+getComputedStyle(test).right;
+</script>
+
diff --git a/tests/wpt/tests/css/cssom/insert-dir-rule-in-iframe-crash.html b/tests/wpt/tests/css/cssom/insert-dir-rule-in-iframe-crash.html
new file mode 100644
index 00000000000..4c9d7530dc3
--- /dev/null
+++ b/tests/wpt/tests/css/cssom/insert-dir-rule-in-iframe-crash.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<title>CSSOM Test: Chrome crash inserting :dir rule in iframe</title>
+<link rel="help" href="https://crbug.com/1486351">
+<p>PASS if no crash.</p>
+<iframe srcdoc='<!DOCTYPE html>
+                <style id="sheet"> </style>
+                <div id="host"></div>
+                <script>
+                  let root = host.attachShadow({mode:"open"});
+                  root.innerHTML = "<slot></slot>";
+                  host.offsetTop;
+                  host.innerHTML = "<span>Green</span>";
+                  sheet.sheet.insertRule("html:dir(ltr) { color: green; }");
+                  getComputedStyle(host).color;
+                </script>
+                '>
+</iframe>
diff --git a/tests/wpt/tests/css/printing/crashtests/root-element-remove-print.html b/tests/wpt/tests/css/printing/crashtests/root-element-remove-print.html
new file mode 100644
index 00000000000..8497e8c4fd7
--- /dev/null
+++ b/tests/wpt/tests/css/printing/crashtests/root-element-remove-print.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1491107">
+Nothing here.
+<script>
+  var root = document.documentElement;
+  root.parentNode.removeChild(root);
+</script>
diff --git a/tests/wpt/tests/css/printing/media-queries-002-print.html b/tests/wpt/tests/css/printing/media-queries-002-print.html
new file mode 100644
index 00000000000..5f71f3d17a7
--- /dev/null
+++ b/tests/wpt/tests/css/printing/media-queries-002-print.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1491643">
+<link rel="match" href="reference/filled-green-100px-square-print-ref.html">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<iframe src="resources/mq-frame-100px.html" style="display:block; border:none; width:100px; height:100px; background:red;"></iframe>
diff --git a/tests/wpt/tests/css/printing/media-queries-003-print-ref.html b/tests/wpt/tests/css/printing/media-queries-003-print-ref.html
new file mode 100644
index 00000000000..99642ca5674
--- /dev/null
+++ b/tests/wpt/tests/css/printing/media-queries-003-print-ref.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  body { margin-right: 108px; }
+</style>
+<div style="position:absolute; right:0; bottom:0; width:100px; height:100px; background:green;"></div>
+There should be a green square in the bottom right corner.
diff --git a/tests/wpt/tests/css/printing/media-queries-003-print.html b/tests/wpt/tests/css/printing/media-queries-003-print.html
new file mode 100644
index 00000000000..2c125296ad2
--- /dev/null
+++ b/tests/wpt/tests/css/printing/media-queries-003-print.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1491643">
+<link rel="match" href="media-queries-003-print-ref.html">
+<frameset cols="*,100" rows="*,100" frameborder="0">
+  <frame src="data:text/html,There should be a green square in the bottom right corner."></frame>
+  <frame src="data:text/html,"></frame>
+  <frame src="data:text/html,"></frame>
+  <frame src="resources/mq-frame-100px.html"></frame>
+</frameset>
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-024-print-ref.html b/tests/wpt/tests/css/printing/monolithic-overflow-024-print-ref.html
new file mode 100644
index 00000000000..fc964fde32d
--- /dev/null
+++ b/tests/wpt/tests/css/printing/monolithic-overflow-024-print-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    size: 100px;
+    margin: 0;
+  }
+  body {
+    margin: 0;
+  }
+  div {
+    width: 60px;
+  }
+</style>
+<div style="height:70px;"></div>
+<div style="height:60px; background:black;"></div>
+<div style="height:140px;"></div>
+<div style="height:60px; background:black;"></div>
+<div style="height:140px;"></div>
+<div style="height:60px; background:black;"></div>
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-024-print.html b/tests/wpt/tests/css/printing/monolithic-overflow-024-print.html
new file mode 100644
index 00000000000..6153bc98ae0
--- /dev/null
+++ b/tests/wpt/tests/css/printing/monolithic-overflow-024-print.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-break-3/#possible-breaks">
+<link rel="match" href="monolithic-overflow-024-print-ref.html">
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+  @page {
+    size: 100px;
+    margin: 0;
+  }
+  body {
+    margin: 0;
+    font: 60px/200px Ahem;
+  }
+</style>
+x x x
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-025-print-ref.html b/tests/wpt/tests/css/printing/monolithic-overflow-025-print-ref.html
new file mode 100644
index 00000000000..edbb9ac011a
--- /dev/null
+++ b/tests/wpt/tests/css/printing/monolithic-overflow-025-print-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    size: 100px;
+    margin: 0;
+  }
+  body {
+    margin: 0;
+  }
+  div {
+    width: 60px;
+    margin-left: 40px;
+  }
+</style>
+<div style="height:70px;"></div>
+<div style="height:60px; background:black;"></div>
+<div style="height:140px;"></div>
+<div style="height:60px; background:black;"></div>
+<div style="height:140px;"></div>
+<div style="height:60px; background:black;"></div>
+<div style="height:140px;"></div>
+<div style="height:60px; background:black;"></div>
diff --git a/tests/wpt/tests/css/printing/monolithic-overflow-025-print.html b/tests/wpt/tests/css/printing/monolithic-overflow-025-print.html
new file mode 100644
index 00000000000..3fefbc37e2e
--- /dev/null
+++ b/tests/wpt/tests/css/printing/monolithic-overflow-025-print.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="">
+<link rel="match" href="monolithic-overflow-025-print-ref.html">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+<style>
+  @page {
+    size: 100px;
+    margin: 0;
+  }
+  body {
+    margin: 0;
+    font: 60px/200px Ahem;
+  }
+</style>
+<span style="position:relative; left:40px;">
+  x x x x
+</span>
diff --git a/tests/wpt/tests/css/printing/negative-overflow-print-ref.html b/tests/wpt/tests/css/printing/negative-overflow-print-ref.html
new file mode 100644
index 00000000000..64786375f7e
--- /dev/null
+++ b/tests/wpt/tests/css/printing/negative-overflow-print-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<div>
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+</div>
diff --git a/tests/wpt/tests/css/printing/negative-overflow-print.html b/tests/wpt/tests/css/printing/negative-overflow-print.html
new file mode 100644
index 00000000000..158fecc5f69
--- /dev/null
+++ b/tests/wpt/tests/css/printing/negative-overflow-print.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<link rel="match" href="negative-overflow-print-ref.html">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1488825">
+<div>
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+  text text text text
+</div>
+<div style="position: absolute; top: -9999px; left: -9999px; width: 10px; height: 10px;"></div>
diff --git a/tests/wpt/tests/css/printing/page-margin-004-print-ref.html b/tests/wpt/tests/css/printing/page-margin-004-print-ref.html
new file mode 100644
index 00000000000..24549d49542
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-004-print-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<title>CSS Test Reference</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    size: 300px;
+    margin: 10px 20px 30px 40px;
+  }
+  body {
+    margin: 0;
+  }
+</style>
+<div style="border:10px solid; background:yellow;">
+  <div style="height:250px;">Page 1</div>
+  <div style="background:cyan;">
+    Page 2
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/printing/page-margin-004-print.html b/tests/wpt/tests/css/printing/page-margin-004-print.html
new file mode 100644
index 00000000000..cb9343dcf17
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-004-print.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>Test that a fragmented OOF is sized and posisitioned correctly within the containing block, which is the page box size minus the margins</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#at-page-rule">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1486499">
+<link rel="match" href="page-margin-004-print-ref.html">
+<style>
+  @page {
+    size: 300px;
+    margin: 10px 20px 30px 40px;
+  }
+  body {
+    margin: 0;
+  }
+</style>
+<div style="position:absolute; box-sizing:border-box; width:100%; border:10px solid; background:yellow;">
+  Page 1
+  <div style="break-before:page; background:cyan;">
+    Page 2
+  </div>
+</div>
diff --git a/tests/wpt/tests/css/printing/page-margin-005-print-ref.html b/tests/wpt/tests/css/printing/page-margin-005-print-ref.html
new file mode 100644
index 00000000000..bd1829be383
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-005-print-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    size: 600px 300px;
+    margin: 30px;
+  }
+  body {
+    margin: 0;
+    background: cyan;
+  }
+</style>
+The page margins should be the same on every side (30px).<br>
+There's a 30px square in the bottom right corner.
+<div style="position:fixed; right:0; bottom:0; width:30px; height:30px; background:hotpink;"></div>
+<div style="break-before:page;">
+  Same on the second page.
+</div>
diff --git a/tests/wpt/tests/css/printing/page-margin-005-print.html b/tests/wpt/tests/css/printing/page-margin-005-print.html
new file mode 100644
index 00000000000..8ca80bc6972
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-005-print.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<title>Percentage-based @page margins should resolve against the correct dimension</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-properties">
+<link rel="match" href="page-margin-005-print-ref.html">
+<style>
+  @page {
+    size: 600px 300px;
+    margin: 10% 5%;
+  }
+  body {
+    margin: 0;
+    background: cyan;
+  }
+</style>
+The page margins should be the same on every side (30px).<br>
+There's a 30px square in the bottom right corner.
+<div style="position:fixed; right:0; bottom:0; width:30px; height:30px; background:hotpink;"></div>
+<div style="break-before:page;">
+  Same on the second page.
+</div>
diff --git a/tests/wpt/tests/css/printing/page-margin-006-print-ref.html b/tests/wpt/tests/css/printing/page-margin-006-print-ref.html
new file mode 100644
index 00000000000..fe7a2c66db2
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-006-print-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    size: 6in;
+    margin: 0.5in;
+  }
+  html {
+    background: yellow;
+    margin: 0.5in;
+  }
+  body {
+    margin: 0;
+    background: cyan;
+  }
+</style>
+There should be a half-inch page margin on every side. The cyan box should be
+inset by yet another half-inch, except at the bottom.
+<div style="break-before:page;">
+  Second page.
+</div>
diff --git a/tests/wpt/tests/css/printing/page-margin-006-print.html b/tests/wpt/tests/css/printing/page-margin-006-print.html
new file mode 100644
index 00000000000..43621acf809
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-margin-006-print.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>Percentage-based @page margins should resolve against the correct dimension</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-properties">
+<link rel="match" href="page-margin-006-print-ref.html">
+<style>
+  @page {
+    size: 6in;
+    margin: 13px;
+    margin: inherit;
+  }
+  html {
+    background: yellow;
+    margin: 0.5in;
+  }
+  body {
+    margin: 0;
+    background: cyan;
+  }
+</style>
+There should be a half-inch page margin on every side. The cyan box should be
+inset by yet another half-inch, except at the bottom.
+<div style="break-before:page;">
+  Second page.
+</div>
diff --git a/tests/wpt/tests/css/printing/page-size-010-print-ref.html b/tests/wpt/tests/css/printing/page-size-010-print-ref.html
new file mode 100644
index 00000000000..27cbe4435c2
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-size-010-print-ref.html
@@ -0,0 +1,92 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    margin: 96px;
+  }
+  @page letter {
+    size: 816px 1056px;
+  }
+  @page letter-landscape {
+    size: 1056px 816px;
+  }
+  @page legal {
+    size: 816px 1344px;
+  }
+  @page legal-landscape {
+    size: 1344px 816px;
+  }
+  @page ledger {
+    size: 1056px 1632px;
+  }
+  @page ledger-landscape {
+    size: 1632px 1056px;
+  }
+  body { margin: 0; }
+</style>
+<div style="page:letter;">
+  Page size: letter
+  <p style="width:624px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
+<div style="page:letter-landscape;">
+  Page size: letter landscape
+  <p style="width:864px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
+<div style="page:legal;">
+  Page size: legal
+  <p style="width:624px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
+<div style="page:legal-landscape;">
+  Page size: legal landscape
+  <p style="width:1152px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
+<div style="page:ledger;">
+  Page size: ledger
+  <p style="width:864px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
+<div style="page:ledger-landscape;">
+  Page size: ledger landscape
+  <p style="width:1440px;">Tenderloin ham boudin tongue sausage venison short
+    ribs sirloin, kielbasa beef ribs. Strip steak shank bresaola salami spare
+    ribs kielbasa fatback, cow t-bone flank leberkas sirloin. Jowl pork belly
+    ribeye, corned beef sirloin chicken salami tail. Rump swine ham shank corned
+    beef short loin, speck turkey pancetta shankle frankfurter. Pancetta tail
+    fatback, ground round brisket biltong frankfurter turkey. Ham hock chicken
+    strip steak, salami short ribs beef ribs pork sirloin pastrami pork loin
+    turducken rump brisket andouille.</p>
+</div>
diff --git a/tests/wpt/tests/css/printing/page-size-010-print.html b/tests/wpt/tests/css/printing/page-size-010-print.html
new file mode 100644
index 00000000000..21205e06a03
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-size-010-print.html
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<title>Test predefined American (inches) page sizes.</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#at-page-rule">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#typedef-page-size-page-size">
+<link rel="match" href="page-size-010-print-ref.html">
+<style>
+  @page {
+    margin: 1in;
+  }
+  @page letter {
+    size: letter;
+  }
+  @page letter-landscape {
+    size: letter landscape;
+  }
+  @page legal {
+    size: legal;
+  }
+  @page legal-landscape {
+    size: legal landscape;
+  }
+  @page ledger {
+    size: ledger;
+  }
+  @page ledger-landscape {
+    size: ledger landscape;
+  }
+  body { margin: 0; }
+</style>
+<div style="page:letter;">
+  Page size: letter
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
+<div style="page:letter-landscape;">
+  Page size: letter landscape
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
+<div style="page:legal;">
+  Page size: legal
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
+<div style="page:legal-landscape;">
+  Page size: legal landscape
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
+<div style="page:ledger;">
+  Page size: ledger
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
+<div style="page:ledger-landscape;">
+  Page size: ledger landscape
+  <p>Tenderloin ham boudin tongue sausage venison short ribs sirloin, kielbasa
+    beef ribs. Strip steak shank bresaola salami spare ribs kielbasa fatback,
+    cow t-bone flank leberkas sirloin. Jowl pork belly ribeye, corned beef
+    sirloin chicken salami tail. Rump swine ham shank corned beef short loin,
+    speck turkey pancetta shankle frankfurter. Pancetta tail fatback, ground
+    round brisket biltong frankfurter turkey. Ham hock chicken strip steak,
+    salami short ribs beef ribs pork sirloin pastrami pork loin turducken rump
+    brisket andouille.</p>
+</div>
diff --git a/tests/wpt/tests/css/printing/page-size-011-print-ref.html b/tests/wpt/tests/css/printing/page-size-011-print-ref.html
new file mode 100644
index 00000000000..945f105ef47
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-size-011-print-ref.html
@@ -0,0 +1,93 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<style>
+  @page {
+    margin: 10mm;
+  }
+  @page a5 {
+    size: 148mm 210mm;
+  }
+  @page a5-landscape {
+    size: 210mm 148mm;
+  }
+  @page a4 {
+    size: 210mm 297mm;
+  }
+  @page a4-landscape {
+    size: 297mm 210mm;
+  }
+  @page a3 {
+    size: 297mm 420mm;
+  }
+  @page a3-landscape {
+    size: 420mm 297mm;
+  }
+  @page b5 {
+    size: 176mm 250mm;
+  }
+  @page b5-landscape {
+    size: 250mm 176mm;
+  }
+  @page b4 {
+    size: 250mm 353mm;
+  }
+  @page b4-landscape {
+    size: 353mm 250mm;
+  }
+  @page jis-b5 {
+    size: 182mm 257mm;
+  }
+  @page jis-b5-landscape {
+    size: 257mm 182mm;
+  }
+  @page jis-b4 {
+    size: 257mm 364mm;
+  }
+  @page jis-b4-landscape {
+    size: 364mm 257mm;
+  }
+  body { margin: 0; }
+  div { border: solid; }
+</style>
+<div style="page:a5;">
+  Page size: a5
+</div>
+<div style="page:a5-landscape;">
+  Page size: a5 landscape
+</div>
+<div style="page:a4;">
+  Page size: a4
+</div>
+<div style="page:a4-landscape;">
+  Page size: a4 landscape
+</div>
+<div style="page:a3;">
+  Page size: a3
+</div>
+<div style="page:a3-landscape;">
+  Page size: a3 landscape
+</div>
+<div style="page:b5;">
+  Page size: b5
+</div>
+<div style="page:b5-landscape;">
+  Page size: b5 landscape
+</div>
+<div style="page:b4;">
+  Page size: b4
+</div>
+<div style="page:b4-landscape;">
+  Page size: b4 landscape
+</div>
+<div style="page:jis-b5;">
+  Page size: jis-b5
+</div>
+<div style="page:jis-b5-landscape;">
+  Page size: jis-b5 landscape
+</div>
+<div style="page:jis-b4;">
+  Page size: jis-b4
+</div>
+<div style="page:jis-b4-landscape;">
+  Page size: jis-b4 landscape
+</div>
diff --git a/tests/wpt/tests/css/printing/page-size-011-print.html b/tests/wpt/tests/css/printing/page-size-011-print.html
new file mode 100644
index 00000000000..27476058066
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-size-011-print.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<title>Test predefined millimeter-based page sizes.</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#at-page-rule">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#typedef-page-size-page-size">
+<link rel="match" href="page-size-011-print-ref.html">
+<style>
+  @page {
+    margin: 10mm;
+  }
+  @page a5 {
+    size: a5;
+  }
+  @page a5-landscape {
+    size: a5 landscape;
+  }
+  @page a4 {
+    size: a4;
+  }
+  @page a4-landscape {
+    size: a4 landscape;
+  }
+  @page a3 {
+    size: a3;
+  }
+  @page a3-landscape {
+    size: a3 landscape;
+  }
+  @page b5 {
+    size: b5;
+  }
+  @page b5-landscape {
+    size: b5 landscape;
+  }
+  @page b4 {
+    size: b4;
+  }
+  @page b4-landscape {
+    size: b4 landscape;
+  }
+  @page jis-b5 {
+    size: jis-b5;
+  }
+  @page jis-b5-landscape {
+    size: jis-b5 landscape;
+  }
+  @page jis-b4 {
+    size: jis-b4;
+  }
+  @page jis-b4-landscape {
+    size: jis-b4 landscape;
+  }
+  body { margin: 0; }
+  div { border: solid; }
+</style>
+<div style="page:a5;">
+  Page size: a5
+</div>
+<div style="page:a5-landscape;">
+  Page size: a5 landscape
+</div>
+<div style="page:a4;">
+  Page size: a4
+</div>
+<div style="page:a4-landscape;">
+  Page size: a4 landscape
+</div>
+<div style="page:a3;">
+  Page size: a3
+</div>
+<div style="page:a3-landscape;">
+  Page size: a3 landscape
+</div>
+<div style="page:b5;">
+  Page size: b5
+</div>
+<div style="page:b5-landscape;">
+  Page size: b5 landscape
+</div>
+<div style="page:b4;">
+  Page size: b4
+</div>
+<div style="page:b4-landscape;">
+  Page size: b4 landscape
+</div>
+<div style="page:jis-b5;">
+  Page size: jis-b5
+</div>
+<div style="page:jis-b5-landscape;">
+  Page size: jis-b5 landscape
+</div>
+<div style="page:jis-b4;">
+  Page size: jis-b4
+</div>
+<div style="page:jis-b4-landscape;">
+  Page size: jis-b4 landscape
+</div>
diff --git a/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html
new file mode 100644
index 00000000000..fd519c85525
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print-ref.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+This text should be visible.
diff --git a/tests/wpt/tests/css/printing/page-visibility-hidden-001-print.html b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print.html
new file mode 100644
index 00000000000..0de5c5ae825
--- /dev/null
+++ b/tests/wpt/tests/css/printing/page-visibility-hidden-001-print.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<title>Test that visibility:hidden affects the page context, but not the actual contents on the page.</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-properties">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-model">
+<link rel="match" href="page-visibility-hidden-001-print-ref.html">
+<style>
+  @page {
+    visibility: hidden;
+    border: solid red;
+  }
+</style>
+This text should be visible.
diff --git a/tests/wpt/tests/css/printing/reference/blank-print-ref.html b/tests/wpt/tests/css/printing/reference/blank-print-ref.html
new file mode 100644
index 00000000000..ad73420cdb9
--- /dev/null
+++ b/tests/wpt/tests/css/printing/reference/blank-print-ref.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
diff --git a/tests/wpt/tests/css/printing/reference/filled-green-100px-square-print-ref.html b/tests/wpt/tests/css/printing/reference/filled-green-100px-square-print-ref.html
new file mode 100644
index 00000000000..d4834d1358a
--- /dev/null
+++ b/tests/wpt/tests/css/printing/reference/filled-green-100px-square-print-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="width:100px; height:100px; background:green;"></div>
diff --git a/tests/wpt/tests/css/printing/resources/mq-frame-100px.html b/tests/wpt/tests/css/printing/resources/mq-frame-100px.html
new file mode 100644
index 00000000000..ed823c09e89
--- /dev/null
+++ b/tests/wpt/tests/css/printing/resources/mq-frame-100px.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<style>
+body {
+  margin: 0;
+}
+div {
+  background: red;
+}
+@media (width: 100px) and (height: 100px) {
+  div {
+    background: green;
+  }
+}
+</style>
+<div style="height:100px;"></div>
diff --git a/tests/wpt/tests/css/printing/root-element-display-none-print.html b/tests/wpt/tests/css/printing/root-element-display-none-print.html
new file mode 100644
index 00000000000..d6802f62251
--- /dev/null
+++ b/tests/wpt/tests/css/printing/root-element-display-none-print.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<title>display:none on root should produce a blank page</title>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-page-3/#page-properties">
+<link rel="match" href="reference/blank-print-ref.html">
+<style>
+  @page {
+    border: solid red;
+    background: hotpink;
+  }
+  html {
+    display: none;
+  }
+</style>
+FAIL, this page should be blank.
diff --git a/tests/wpt/tests/css/selectors/invalidation/has-pseudo-element.html b/tests/wpt/tests/css/selectors/invalidation/has-pseudo-element.html
new file mode 100644
index 00000000000..0dfd602e511
--- /dev/null
+++ b/tests/wpt/tests/css/selectors/invalidation/has-pseudo-element.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>CSS Selector Invalidation: :has() besides a pseudoelement</title>
+<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
+<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<style>
+.anchor:has(.foo)::before {
+  content: "";
+  display: block;
+  width: 100px;
+  height: 100px;
+  background: green;
+  position: absolute;
+}
+</style>
+<script>
+function go() {
+  dut.classList.add("foo");
+  document.documentElement.classList.remove("reftest-wait");
+}
+</script>
+<body onload="go()">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div class="anchor">
+<div id="dut"></div>
+<div style="width: 100px; height: 100px; background: red;"></div>
+</div>
+</body>
+</html>
diff --git a/tests/wpt/tests/css/selectors/is-where-parsing.html b/tests/wpt/tests/css/selectors/is-where-parsing.html
index 6d404dd953b..ee73fe0f887 100644
--- a/tests/wpt/tests/css/selectors/is-where-parsing.html
+++ b/tests/wpt/tests/css/selectors/is-where-parsing.html
@@ -43,4 +43,8 @@
 
   assert_valid(true, ":not({}(div))", null, "Nested inside :not, without combinators");
   assert_valid(true, ":not({}(div .foo))", null, "Nested inside :not, with combinators");
+  // This should be invalid even with the forgiving behavior because
+  // `<any-value>` doesn't allow bad tokens:
+  // https://drafts.csswg.org/css-syntax-3/#typedef-declaration-value
+  test_invalid_selector(`:is(# C4єанйтж╕/┘ГЁжЮХєа▓┐ЁЭБМєаСеЁЭЖА%=[ямм0)`);
 </script>
diff --git a/tests/wpt/tests/css/zoom/tentative/scroll-corner-crash.html b/tests/wpt/tests/css/zoom/tentative/scroll-corner-crash.html
new file mode 100644
index 00000000000..0ec88deb748
--- /dev/null
+++ b/tests/wpt/tests/css/zoom/tentative/scroll-corner-crash.html
@@ -0,0 +1,7 @@
+<style>
+* {
+  overflow: scroll scroll;
+}
+</style>
+<h4 style="zoom: 3">
+<figure>
diff --git a/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html b/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html
new file mode 100644
index 00000000000..d3d5d4fb969
--- /dev/null
+++ b/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html
@@ -0,0 +1,258 @@
+<!DOCTYPE html>
+<title>Tests which nodes are upgraded after adding a scoped custom element definition</title>
+<meta name="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
+<link rel="help" href="https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries">
+<link rel="help" href="https://github.com/WICG/webcomponents/issues/923">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+
+<script>
+function attachShadowForTest(t, registry) {
+  const host = document.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry});
+  document.body.appendChild(host);
+  t.add_cleanup(() => host.remove());
+  return shadow;
+}
+
+function createIFrameForTest(t) {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  if (!iframe.contentDocument.body) {
+    iframe.contentDocument.body = iframe.contentDocument.createElement('body');
+  }
+  t.add_cleanup(() => iframe.remove());
+  return iframe;
+}
+
+let definitionCount = 0;
+function nextCustomElementName() {
+  return `test-element-${++definitionCount}`;
+}
+
+test(t => {
+  const name = nextCustomElementName();
+  document.body.appendChild(document.createElement(name));
+
+  const registry = new CustomElementRegistry;
+  const shadow = attachShadowForTest(t, registry);
+  shadow.appendChild(document.createElement(name));
+
+  class TestElement extends HTMLElement {};
+  customElements.define(name, TestElement);
+
+  assert_true(document.querySelector(name) instanceof TestElement);
+  assert_false(shadow.querySelector(name) instanceof TestElement);
+}, 'Adding definition to global registry should not affect shadow roots using scoped registry');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const shadow1 = attachShadowForTest(t, customElements);
+  shadow1.appendChild(document.createElement(name));
+
+  const shadow2 = attachShadowForTest(t);
+  shadow2.appendChild(document.createElement(name));
+
+  class TestElement extends HTMLElement {};
+  customElements.define(name, TestElement);
+
+  assert_true(shadow1.querySelector(name) instanceof TestElement);
+  assert_true(shadow2.querySelector(name) instanceof TestElement);
+}, 'Adding definition to global registry should affect shadow roots also using global registry');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const shadow1 = attachShadowForTest(t, registry);
+  shadow1.appendChild(document.createElement(name));
+
+  const shadow2 = attachShadowForTest(t, registry);
+  shadow2.appendChild(document.createElement(name));
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_true(shadow1.querySelector(name) instanceof TestElement);
+  assert_true(shadow2.querySelector(name) instanceof TestElement);
+}, 'Adding definition to scoped registry should affect all associated shadow roots');
+
+test(t => {
+  const name = nextCustomElementName();
+  document.body.appendChild(document.createElement(name));
+
+  const registry = new CustomElementRegistry;
+  const shadow = attachShadowForTest(t, registry);
+  shadow.appendChild(document.createElement(name));
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_false(document.querySelector(name) instanceof TestElement);
+  assert_true(shadow.querySelector(name) instanceof TestElement);
+}, 'Adding definition to scoped registry should not affect document tree scope');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const shadow1 = attachShadowForTest(t, registry);
+  shadow1.appendChild(document.createElement(name));
+
+  const shadow2 = attachShadowForTest(t, new CustomElementRegistry);
+  shadow2.appendChild(document.createElement(name));
+
+  const shadow3 = attachShadowForTest(t);
+  shadow3.appendChild(document.createElement(name));
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_true(shadow1.querySelector(name) instanceof TestElement);
+  assert_false(shadow2.querySelector(name) instanceof TestElement);
+  assert_false(shadow3.querySelector(name) instanceof TestElement);
+}, 'Adding definition to scoped registry should not affect shadow roots using other registries');
+
+test(t => {
+  const name = nextCustomElementName();
+  const node = document.body.appendChild(document.createElement(name));
+
+  const registry = new CustomElementRegistry;
+  const shadow = attachShadowForTest(t, registry);
+  shadow.appendChild(node);
+
+  class TestElement extends HTMLElement {};
+  customElements.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to global registry should not upgrade nodes no longer using the registry');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const shadow1 = attachShadowForTest(t, registry);
+  const node = shadow1.appendChild(document.createElement(name));
+
+  const shadow2 = attachShadowForTest(t, new CustomElementRegistry);
+  shadow2.appendChild(node);
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to scoped registry should not upgrade nodes no longer using the registry');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const shadow1 = attachShadowForTest(t, registry);
+  const node1 = shadow1.appendChild(document.createElement(name));
+
+  const iframe = createIFrameForTest(t);
+  const host2 = iframe.contentDocument.createElement('div');
+  const shadow2 = host2.attachShadow({mode: 'open', registry});
+  const node2 = shadow2.appendChild(iframe.contentDocument.createElement(name));
+  iframe.contentDocument.body.appendChild(host2);
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_true(node1 instanceof TestElement);
+  assert_true(node2 instanceof TestElement);
+}, 'Adding definition to scoped registry affects associated shadow roots in all iframes');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const newWindow = window.open('about:blank');
+  t.add_cleanup(() => newWindow.close());
+
+  const host = newWindow.document.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry: window.customElements});
+  const node = shadow.appendChild(newWindow.document.createElement(name));
+  newWindow.document.body.appendChild(host);
+
+  class TestElement extends HTMLElement {};
+  window.customElements.define(name, TestElement);
+
+  assert_true(node instanceof TestElement);
+}, 'Adding definition to scoped registry affects associated shadow roots in other frame trees');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const shadow = attachShadowForTest(t, registry);
+  const node = shadow.appendChild(document.createElement(name));
+  shadow.host.remove();
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to scoped registry should not upgrade disconnected elements');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const registry = new CustomElementRegistry;
+  const doc = document.implementation.createHTMLDocument();
+  const host = doc.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry});
+  const node = shadow.appendChild(doc.createElement(name));
+  doc.body.appendChild(host);
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to scoped registry should not upgrade nodes in constructed documents');
+
+test(t => {
+  const name = nextCustomElementName();
+
+  const iframe = createIFrameForTest(t);
+  const registry = new CustomElementRegistry;
+  const host = iframe.contentDocument.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry});
+  const node = shadow.appendChild(iframe.contentDocument.createElement(name));
+  iframe.contentDocument.body.appendChild(host);
+
+  iframe.remove();
+
+  class TestElement extends HTMLElement {};
+  registry.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to scoped registry should not upgrade nodes in detached frames');
+
+promise_test(async t => {
+  const name = nextCustomElementName();
+
+  const newWindow = window.open('about:blank');
+  t.add_cleanup(() => newWindow.close());
+
+  const host = newWindow.document.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry: window.customElements});
+  const node = shadow.appendChild(newWindow.document.createElement(name));
+  newWindow.document.body.appendChild(host);
+
+  newWindow.close();
+
+  // `window.close()` is async. Wait a while until it's fully closed
+  await new Promise(resolve => setTimeout(resolve, 500));
+
+  class TestElement extends HTMLElement {};
+  window.customElements.define(name, TestElement);
+
+  assert_false(node instanceof TestElement);
+}, 'Adding definition to scoped registry should not upgrade nodes in closed windows');
+
+</script>
+
+</body>
diff --git a/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html b/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html
new file mode 100644
index 00000000000..4fb0f49f9f0
--- /dev/null
+++ b/tests/wpt/tests/custom-elements/scoped-registry/scoped-registry-define-upgrade-order.tentative.html
@@ -0,0 +1,217 @@
+<!DOCTYPE html>
+<title>Tests element upgrade order after adding a scoped custom element definition</title>
+<meta name="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
+<link rel="help" href="https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries">
+<link rel="help" href="https://github.com/WICG/webcomponents/issues/923">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+
+<script>
+let definitionCount = 0;
+function nextCustomElementDefinition() {
+  const log = [];
+  const name = `test-element-${++definitionCount}`;
+  const constructor = class extends HTMLElement {
+    constructor() {
+      super();
+      log.push(this.id);
+    }
+  };
+  return {name, constructor, log};
+}
+
+function attachShadowForTest(t, {parent, registry}) {
+  parent = parent || document.body;
+  const host = parent.ownerDocument.createElement('div');
+  const shadow = host.attachShadow({mode: 'open', registry});
+  parent.appendChild(host);
+  t.add_cleanup(() => host.remove());
+  return shadow;
+}
+
+function createIFrameForTest(t, {parent, nextSibling}) {
+  parent = parent || document.body;
+  const iframe = parent.ownerDocument.createElement('iframe');
+  parent.insertBefore(iframe, nextSibling);
+  if (!iframe.contentDocument.body) {
+    iframe.contentDocument.body = iframe.contentDocument.createElement('body');
+  }
+  t.add_cleanup(() => iframe.remove());
+  return iframe;
+}
+
+test(t => {
+  const {name, constructor, log} = nextCustomElementDefinition();
+
+  const registry = new CustomElementRegistry;
+  const shadow = attachShadowForTest(t, {registry});
+  shadow.innerHTML = `
+    <${name} id="a"></${name}>
+    <${name} id="b"></${name}>
+    <${name} id="c"></${name}>
+  `;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'b', 'c']);
+}, 'Upgrade in tree order in the same tree scope');
+
+test(t => {
+  // document
+  // +- shadow1
+  // |  +- a
+  // |  +- shadow2
+  // |     +- b
+  // +- shadow3
+  //    +- c
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const shadow1 = attachShadowForTest(t, {registry});
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const shadow2 = attachShadowForTest(t, {registry, parent: shadow1});
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  const shadow3 = attachShadowForTest(t, {registry});
+  shadow3.innerHTML = `<${name} id="c"></${name}>`;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'b', 'c']);
+}, 'Upgrade in shadow-including tree order across tree scopes');
+
+test(t => {
+  // document
+  // +- shadow1
+  // |  +- a
+  // |  +- shadow3
+  // |     +- c
+  // +- shadow2
+  //    +- b
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const shadow1 = attachShadowForTest(t, {registry});
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const shadow2 = attachShadowForTest(t, {registry});
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  const shadow3 = attachShadowForTest(t, {registry, parent: shadow1});
+  shadow3.innerHTML = `<${name} id="c"></${name}>`;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'c', 'b']);
+}, 'Upgrade order does not depend on shadow root attach order');
+
+test(t => {
+  // document
+  // +- iframe1
+  // |   +- shadow1
+  // |   |  +- a
+  // |   +- iframe2
+  // |      +- shadow2
+  // |         +- b
+  // +- shadow3
+  //    +- c
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const iframe1 = createIFrameForTest(t, {});
+  const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const iframe2 = createIFrameForTest(t, {parent: iframe1.contentDocument.body});
+  const shadow2 = attachShadowForTest(t, {registry, parent: iframe2.contentDocument.body});
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  const shadow3 = attachShadowForTest(t, {registry});
+  shadow3.innerHTML = `<${name} id="c"></${name}>`;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'b', 'c']);
+}, 'Upgrade in association order across documents, then tree order in each document');
+
+test(t => {
+  // document
+  // +- iframe2
+  // |  +- shadow2
+  // |     +- b
+  // +- iframe1
+  // |  +- shadow1
+  // |     +- a
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const iframe1 = createIFrameForTest(t, {});
+  const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const iframe2 = createIFrameForTest(t, {nextSibling: iframe1});
+  const shadow2 = attachShadowForTest(t, {registry, parent: iframe2.contentDocument.body});
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'b']);
+}, 'Upgrade order is not affected by DOM order between child frames');
+
+test(t => {
+  // document
+  // +- iframe1
+  // |  +- shadow2
+  // |     +- b
+  // +- iframe2
+  // |  +- shadow1
+  // |     +- a
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const iframe1 = createIFrameForTest(t, {});
+  const iframe2 = createIFrameForTest(t, {});
+
+  const shadow1 = attachShadowForTest(t, {registry});
+  const host1 = shadow1.host;
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const shadow2 = attachShadowForTest(t, {registry});
+  const host2 = shadow2.host;
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  iframe1.contentDocument.body.appendChild(host2);
+  iframe2.contentDocument.body.appendChild(host1);
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['b', 'a']);
+}, 'Upgrade order is affected by shadow tree adoption across documents');
+
+test(t => {
+  // Create a registry in one window, but associate it with another document first
+  // document
+  // +- iframe1
+  // |   +- shadow1
+  // |      +- a
+  // +- shadowr2
+  //    +- b
+
+  const {name, constructor, log} = nextCustomElementDefinition();
+  const registry = new CustomElementRegistry;
+
+  const iframe1 = createIFrameForTest(t, {});
+  const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
+  shadow1.innerHTML = `<${name} id="a"></${name}>`;
+
+  const shadow2 = attachShadowForTest(t, {registry});
+  shadow2.innerHTML = `<${name} id="b"></${name}>`;
+
+  registry.define(name, constructor);
+  assert_array_equals(log, ['a', 'b']);
+}, 'Elements in the "owner" window of a scoped registry are not always upgraded first');
+
+</script>
+</body>
diff --git a/tests/wpt/tests/docs/writing-tests/channels.md b/tests/wpt/tests/docs/writing-tests/channels.md
index 9296247fca4..ccccd3c39aa 100644
--- a/tests/wpt/tests/docs/writing-tests/channels.md
+++ b/tests/wpt/tests/docs/writing-tests/channels.md
@@ -27,7 +27,7 @@ Channels can be used in any global and are not specifically linked to
 The high level API provides a way to message another global, and to
 execute functions in that global and return the result.
 
-Globals wanting to recieve messages using the high level API have to
+Globals wanting to receive messages using the high level API have to
 be loaded with a `uuid` query parameter in their URL, with a value
 that's a UUID. This will be used to identify the channel dedicated to
 messages sent to that context.
diff --git a/tests/wpt/tests/docs/writing-tests/reftest-tutorial.md b/tests/wpt/tests/docs/writing-tests/reftest-tutorial.md
index a51430942ce..a8e6aeeca1b 100644
--- a/tests/wpt/tests/docs/writing-tests/reftest-tutorial.md
+++ b/tests/wpt/tests/docs/writing-tests/reftest-tutorial.md
@@ -68,7 +68,7 @@ Here's one way to demonstrate the feature:
 <meta charset="utf-8">
 <title>BDO element dir=rtl</title>
 <link rel="help" href="https://html.spec.whatwg.org/#the-bdo-element">
-<meta name="assert" content="BDO element's DIR content attribute renders corrently given value of 'rtl'.">
+<meta name="assert" content="BDO element's DIR content attribute renders correctly given value of 'rtl'.">
 
 <p>Test passes if WAS is displayed below.</p>
 <bdo dir="rtl">SAW</bdo>
@@ -101,7 +101,7 @@ That's pretty dense! Let's break it down:
   for a feature outside of CSS, feel free to omit this tag.
 
 - ```html
-  <meta name="assert" content="BDO element's DIR content attribute renders corrently given value of 'rtl'.">
+  <meta name="assert" content="BDO element's DIR content attribute renders correctly given value of 'rtl'.">
   ```
 
   The "assert" metadata is a structured way for you to describe exactly what
@@ -188,7 +188,7 @@ summary:
  <link rel="author" title="Sam Smith" href="mailto:sam@example.com">
  <link rel="help" href="https://html.spec.whatwg.org/#the-bdo-element">
 +<link rel="match" href="rtl-ref.html">
- <meta name="assert" content="BDO element's DIR content attribute renders corrently given value of 'rtl'.">
+ <meta name="assert" content="BDO element's DIR content attribute renders correctly given value of 'rtl'.">
 
  <p>Test passes if WAS is displayed below.</p>
  <bdo dir="rtl">SAW</bdo>
diff --git a/tests/wpt/tests/docs/writing-tests/testdriver.md b/tests/wpt/tests/docs/writing-tests/testdriver.md
index d5f7f8d3667..14eb3dc79b3 100644
--- a/tests/wpt/tests/docs/writing-tests/testdriver.md
+++ b/tests/wpt/tests/docs/writing-tests/testdriver.md
@@ -111,6 +111,14 @@ the global scope.
 .. js:autofunction:: test_driver.reset_fedcm_cooldown
 ```
 
+### Sensors ###
+```eval_rst
+.. js:autofunction:: test_driver.create_virtual_sensor
+.. js:autofunction:: test_driver.update_virtual_sensor
+.. js:autofunction:: test_driver.remove_virtual_sensor
+.. js:autofunction:: test_driver.get_virtual_sensor_information
+```
+
 ### Using test_driver in other browsing contexts ###
 
 Testdriver can be used in browsing contexts (i.e. windows or frames)
@@ -146,7 +154,7 @@ scripts directly in the relevant document, and use the
 specify the browsing context containing testharness.js. Commands are
 then sent via `postMessage` to the test context. For convenience there
 is also a [`test_driver.message_test`](#test_driver.message_test)
-function that can be used to send arbitary messages to the test
+function that can be used to send arbitrary messages to the test
 window. For example, in an auxillary browsing context:
 
 ```js
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
index 37c242661d6..9e5a044bd34 100644
--- a/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
+++ b/tests/wpt/tests/dom/observable/tentative/observable-constructor.any.js
@@ -1,3 +1,6 @@
+// Because we test that the global error handler is called at various times.
+setup({allow_uncaught_exception: true});
+
 test(() => {
   assert_implements(self.Observable, "The Observable interface is not implemented");
 
@@ -82,7 +85,7 @@ test(() => {
   });
 
   source.subscribe({
-    next: () => assert_unreached("next should not be called"),
+    next: (x) => results.push(x),
     error: (e) => results.push(e),
     complete: () => assert_unreached("complete should not be called"),
   });
@@ -97,6 +100,9 @@ test(() => {
 test(() => {
   const error = new Error("error");
   const results = [];
+  let errorReported = null;
+
+  self.addEventListener("error", e => errorReported = e, {once: true});
 
   const source = new Observable((subscriber) => {
     subscriber.next(1);
@@ -113,10 +119,13 @@ test(() => {
     complete: () => assert_unreached("complete should not be called"),
   });
 
+  assert_equals(errorReported, null, "The global error handler should not be " +
+      "invoked when the subscribe callback throws an error and the " +
+      "subscriber has given an error handler");
   assert_array_equals(
     results,
     [1, error],
-    "should emit values and the throw error synchronously"
+    "should emit values and the thrown error synchronously"
   );
 }, "Observable should error if initializer throws");
 
@@ -197,84 +206,61 @@ test(() => {
 }, "Completing or nexting a subscriber after an error does nothing");
 
 test(() => {
-  const error = new Error("error");
-  let errorReported = false;
+  const error = new Error("custom error");
+  let errorReported = null;
 
-  self.addEventListener(
-    "error",
-    (e) => {
-      assert_equals(e.message, "Uncaught (in observable) error");
-      assert_equals(e.filename, location.href);
-      assert_greater_than(e.lineno, 0);
-      assert_greater_than(e.colno, 0);
-      assert_equals(e.error, error);
-      errorReported = true;
-    },
-    { once: true }
-  );
+  self.addEventListener("error", e => errorReported = e, { once: true });
 
   const source = new Observable((subscriber) => {
     subscriber.error(error);
   });
 
-  // No error handler provided.
+  // No error handler provided...
   source.subscribe({
     next: () => assert_unreached("next should not be called"),
     complete: () => assert_unreached("complete should not be called"),
   });
 
-  assert_true(errorReported);
+  // ... still the exception is reported to the global.
+  assert_true(errorReported !== null, "Exception was reported to global");
+  assert_equals(errorReported.message, "Uncaught Error: custom error", "Error message matches");
+  assert_greater_than(errorReported.lineno, 0, "Error lineno is greater than 0");
+  assert_greater_than(errorReported.colno, 0, "Error lineno is greater than 0");
+  assert_equals(errorReported.error, error, "Error object is equivalent");
 }, "Errors pushed to the subscriber that are not handled by the subscription " +
    "are reported to the global");
 
 test(() => {
-  const error = new Error("error");
-  let errorReported = false;
+  const error = new Error("custom error");
+  let errorReported = null;
 
-  self.addEventListener(
-    "error",
-    (e) => {
-      assert_equals(e.message, "Uncaught (in observable) error");
-      assert_equals(e.filename, location.href);
-      assert_greater_than(e.lineno, 0);
-      assert_greater_than(e.colno, 0);
-      assert_equals(e.error, error);
-      errorReported = true;
-    },
-    { once: true }
-  );
+  self.addEventListener("error", e => errorReported = e, { once: true });
 
   const source = new Observable((subscriber) => {
     throw error;
   });
 
-  // No error handler provided.
+  // No error handler provided...
   source.subscribe({
     next: () => assert_unreached("next should not be called"),
     complete: () => assert_unreached("complete should not be called"),
   });
 
-  assert_true(errorReported);
+  // ... still the exception is reported to the global.
+  assert_true(errorReported !== null, "Exception was reported to global");
+  assert_equals(errorReported.message, "Uncaught Error: custom error", "Error message matches");
+  assert_greater_than(errorReported.lineno, 0, "Error lineno is greater than 0");
+  assert_greater_than(errorReported.colno, 0, "Error lineno is greater than 0");
+  assert_equals(errorReported.error, error, "Error object is equivalent");
 }, "Errors thrown in the initializer that are not handled by the " +
    "subscription are reported to the global");
 
 test(() => {
-  const error = new Error("error");
+  const error = new Error("custom error");
   const results = [];
-  let errorReported = false;
+  let errorReported = null;
 
-  self.addEventListener(
-    "error",
-    (e) => {
-      assert_equals(e.message, "Uncaught (in observable) error");
-      assert_equals(e.filename, location.href);
-      assert_greater_than(e.lineno, 0);
-      assert_greater_than(e.colno, 0);
-      assert_equals(e.error, error);
-      errorReported = true;
-    },
-    { once: true }
-  );
+  self.addEventListener("error", e => errorReported = e, { once: true });
 
   const source = new Observable((subscriber) => {
     subscriber.next(1);
@@ -295,27 +281,21 @@ test(() => {
     "should emit values synchronously, but not error values after complete"
   );
 
-  assert_true(errorReported);
+  // Error reporting still happens even after  the subscription is closed.
+  assert_true(errorReported !== null, "Exception was reported to global");
+  assert_equals(errorReported.message, "Uncaught Error: custom error", "Error message matches");
+  assert_greater_than(errorReported.lineno, 0, "Error lineno is greater than 0");
+  assert_greater_than(errorReported.colno, 0, "Error lineno is greater than 0");
+  assert_equals(errorReported.error, error, "Error object is equivalent");
 }, "Subscription reports errors that are pushed after subscriber is closed " +
    "by completion");
 
-test(() => {
-  const error = new Error("error");
+test(t => {
+  const error = new Error("custom error");
   const results = [];
-  let errorReported = false;
+  let errorReported = null;
 
-  self.addEventListener(
-    "error",
-    (e) => {
-      assert_equals(e.message, "Uncaught (in observable) error");
-      assert_equals(e.filename, location.href);
-      assert_greater_than(e.lineno, 0);
-      assert_greater_than(e.colno, 0);
-      assert_equals(e.error, error);
-      errorReported = true;
-    },
-    { once: true }
-  );
+  self.addEventListener("error", e => errorReported = e, { once: true });
 
   const source = new Observable((subscriber) => {
     subscriber.next(1);
@@ -330,12 +310,14 @@ test(() => {
     complete: () => results.push("complete"),
   });
 
-  assert_array_equals(
-    results,
-    [1, 2, "complete"],
+  assert_array_equals(results, [1, 2, "complete"],
     "should emit values synchronously, but not error after complete"
   );
 
-  assert_true(errorReported);
+  assert_true(errorReported !== null, "Exception was reported to global");
+  assert_true(errorReported.message.includes("custom error"), "Error message matches");
+  assert_greater_than(errorReported.lineno, 0, "Error lineno is greater than 0");
+  assert_greater_than(errorReported.colno, 0, "Error lineno is greater than 0");
+  assert_equals(errorReported.error, error, "Error object is equivalent");
 }, "Errors thrown by initializer function after subscriber is closed by " +
    "completion are reported");
diff --git a/tests/wpt/tests/dom/observable/tentative/observable-constructor.window.js b/tests/wpt/tests/dom/observable/tentative/observable-constructor.window.js
new file mode 100644
index 00000000000..34776f8fc56
--- /dev/null
+++ b/tests/wpt/tests/dom/observable/tentative/observable-constructor.window.js
@@ -0,0 +1,100 @@
+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 => {
+  // Hang this off of the main document's global, so the child can easily reach
+  // it.
+  window.results = [];
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  contentWin.eval(`
+    // Get a reference to the parent result array before we detach and lose
+    // access to the parent.
+    const parentResults = parent.results;
+
+    const source = new Observable((subscriber) => {
+      parentResults.push("subscribe");
+      // Detach the iframe and push a value to the subscriber/Observer.
+      window.frameElement.remove();
+      parentResults.push("detached");
+      subscriber.next("next");
+      subscriber.complete();
+      subscriber.error("error");
+    });
+    source.subscribe({
+      next: v => {
+        // Should never run.
+        parentResults.push(v);
+      },
+      complete: () => {
+        // Should never run.
+        parentResults.push("complete");
+      },
+      erorr: e => {
+        // Should never run.
+        parentResults.push(e);
+      }
+    });
+  `);
+
+  assert_array_equals(results, ["subscribe", "detached"]);
+}, "No observer handlers can be invoked in detached document");
+
+promise_test(async t => {
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  // Set a global error handler on the iframe document's window, and verify that
+  // it is never called (because the thing triggering the error happens when the
+  // document is detached, and "reporting the exception" relies on an attached
+  // document).
+  contentWin.addEventListener("error",
+      t.unreached_func("Error should not be called"), { once: true });
+
+  contentWin.eval(`
+    const source = new Observable((subscriber) => {
+      // Detach the iframe and push an error, which would normally "report the
+      // exception", since this subscriber did not specify an error handler.
+      window.frameElement.remove();
+      subscriber.error("this is an error that should not be reported");
+    });
+    source.subscribe();
+  `);
+}, "Subscriber.error() does not \"report the exception\" even when an " +
+   "`error()` handler is not present, when it is invoked in a detached document");
+
+promise_test(async t => {
+  // Make this available off the global so the child can reach it.
+  window.results = [];
+  const contentWin = await loadIframeAndReturnContentWindow();
+
+  // Set a global error handler on the iframe document's window, and verify that
+  // it is never called (because the thing triggering the error happens when the
+  // document is detached, and "reporting the exception" relies on an attached
+  // document).
+  contentWin.addEventListener("error",
+      t.unreached_func("Error should not be called"), { once: true });
+
+  contentWin.eval(`
+    const parentResults = parent.results;
+    const source = new Observable((subscriber) => {
+      // This should never run.
+      parentResults.push('subscribe');
+    });
+
+    // Detach the iframe and try to subscribe.
+    window.frameElement.remove();
+    parentResults.push('detached');
+    source.subscribe();
+  `);
+
+  assert_array_equals(results, ["detached"], "Subscribe callback is never invoked");
+}, "Cannot subscribe to an Observable in a detached document");
diff --git a/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html
index a1af7e89c29..58db5cd04ff 100644
--- a/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html
+++ b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax-innerhtml.tentative.html
@@ -70,5 +70,32 @@ test((t) => {
   });
   assert_equals(root.getParts().length,1,'There should be one NodePart');
 }, `Basic NodePart parsing`);
+
+
+test((t) => {
+  const tmpl = document.createElement('template');
+  tmpl.parseparts = true;
+  tmpl.innerHTML = ' <div id={{}} class={{}} foo=baz></div>';
+  const root = tmpl.content.getPartRoot();
+  t.add_cleanup(() => {
+    tmpl.remove();
+    root.getParts().forEach(part => part.disconnect());
+  });
+  assert_equals(root.getParts().length,0,'Declarative AttributeParts should be automatic, and should not show up in getParts()');
+  function checkBasics(checkContent,expectId,expectClass) {
+    const innerDiv = checkContent.firstElementChild;
+    assert_equals(innerDiv.localName,'div');
+    assert_equals(innerDiv.getAttribute('id'),expectId || '','Declarative AttributeParts id attribute');
+    assert_equals(innerDiv.getAttribute('class'),expectClass || '','Declarative AttributeParts class attribute');
+    assert_equals(innerDiv.getAttribute('foo'),'baz','Declarative AttributeParts should not touch other attributes');
+    return innerDiv;
+  }
+  checkBasics(tmpl.content);
+  const clone = root.clone();
+  const clonedDiv = checkBasics(clone.rootContainer);
+  const cloneWithValues = root.clone({attributeValues: ['foo','bar']});
+  const clonedDiv2 = checkBasics(cloneWithValues.rootContainer,'foo','bar');
+}, `Basic AttributePart cloning with values`);
+
 </script>
 
diff --git a/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax.tentative.html b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax.tentative.html
index dd5f1ba7b10..001ac24a445 100644
--- a/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax.tentative.html
+++ b/tests/wpt/tests/dom/parts/basic-dom-part-declarative-brace-syntax.tentative.html
@@ -17,7 +17,7 @@
     <h1 id="name" parseparts>
       {{#}}
         First
-        {{#}} <span {{}}>Middle</span> {{/}}
+        {{#}} <span {{}} id={{}}>Middle</span> {{/}}
         Last
       {{/}}
       <a foo {{}} id=nodepart1>content</a>
@@ -35,7 +35,7 @@
       <h1 id="name" parseparts>
         {{#}}
           First
-          {{#}} <span {{}}>Middle</span> {{/}}
+          {{#}} <span {{}} id={{}}>Middle</span> {{/}}
           Last
         {{/}}
         <a foo {{}} id=nodepart1>content</a>
@@ -124,7 +124,7 @@ const template = document.getElementById('declarative');
       assertIsComment(childPart2.previousSibling,'');
       assertIsComment(childPart2.nextSibling,'');
       const expectedChild2Parts = [{type:'NodePart',metadata:[]}];
-      assertEqualParts(childPart2.getParts(),expectedChild2Parts,0,'Second level childpart should have just the node part');
+      assertEqualParts(childPart2.getParts(),expectedChild2Parts,0,'Second level childpart should have just the node part (AttributePart is automatic)');
       assert_true(childPart2.getParts()[0].node instanceof HTMLSpanElement);
       assert_equals(childPart2.getParts()[0].node.textContent,'Middle');
     } else {
diff --git a/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html b/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
index d7adf61739c..c8c478efb55 100644
--- a/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
+++ b/tests/wpt/tests/dom/parts/basic-dom-part-objects.tentative.html
@@ -59,6 +59,24 @@ function addCleanup(t, part) {
 
     assert_throws_js(TypeError,() => new NodePart(nodePart,target.children[0]),'Constructing a Part with a NodePart as the PartRoot should throw');
 
+    const attributePart = addCleanup(t,new AttributePart(root,target,'attributename',/*automatic*/false,{metadata: ['attribute-non-auto']}));
+    assertEqualParts([attributePart],[{type:'AttributePart',metadata:['attribute-non-auto']}],0,'Basic AttributePart');
+    assert_equals(attributePart.node,target);
+    assert_equals(attributePart.root,root);
+    assert_equals(attributePart.localName,'attributename');
+    assert_equals(attributePart.automatic,false);
+    runningPartsExpectation.push({type:'AttributePart',metadata:['attribute-non-auto']});
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart],'getParts() for the root should now have this attributePart');
+    assert_equals(parts.length,0,'Return value of getParts() is not live');
+
+    const attributePartAuto = addCleanup(t,new AttributePart(root,target,'attributename',/*automatic*/true,{metadata: ['attribute-auto']}));
+    assertEqualParts([attributePartAuto],[{type:'AttributePart',metadata:['attribute-auto']}],0,'Basic automatic AttributePart');
+    assert_equals(attributePartAuto.node,target);
+    assert_equals(attributePartAuto.root,root);
+    assert_equals(attributePartAuto.localName,'attributename');
+    assert_equals(attributePartAuto.automatic,true);
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart],'automatic AttributePart should not get included in getParts()');
+
     const childNodePart = addCleanup(t,new ChildNodePart(root,target.children[0], target.children[2],{metadata:['bar','baz']}));
     assertEqualParts([childNodePart],[{type:'ChildNodePart',metadata:['bar','baz']}],0,'Basic ChildNodePart');
     assert_equals(childNodePart.root,root);
@@ -66,30 +84,30 @@ function addCleanup(t, part) {
     assert_equals(childNodePart.nextSibling,target.children[2]);
     assert_equals(childNodePart.getParts().length,0,'childNodePart.getParts() should start out empty');
     runningPartsExpectation.push({type:'ChildNodePart',metadata:['bar','baz']});
-    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,childNodePart],'getParts() for the root should now have this childNodePart');
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart,childNodePart],'getParts() for the root should now have this childNodePart');
 
     const nodeBefore = target.previousSibling || target.parentNode;
     const nodePartBefore = addCleanup(t,new NodePart(root,nodeBefore));
     runningPartsExpectation.push({type:'NodePart',metadata:[]});
-    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,childNodePart,nodePartBefore],'getParts() for the root should now have this nodePart, in construction order');
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart,childNodePart,nodePartBefore],'getParts() for the root should now have this nodePart, in construction order');
 
     const nodePart2 = addCleanup(t,new NodePart(childNodePart,target.children[2],{metadata:['blah']}));
     assert_equals(nodePart2.root,childNodePart);
-    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,childNodePart,nodePartBefore],'getParts() for the root DocumentPartRoot shouldn\'t change');
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart,childNodePart,nodePartBefore],'getParts() for the root DocumentPartRoot shouldn\'t change');
     assertEqualParts(childNodePart.getParts(),[{type:'NodePart',metadata:['blah']}],[nodePart2],'getParts() for the childNodePart should have it');
 
     nodePart2.disconnect();
     assert_equals(nodePart2.root,null,'root should be null after disconnect');
     assert_equals(nodePart2.node,null,'node should be null after disconnect');
     assert_equals(childNodePart.getParts().length,0,'calling disconnect() should remove the part from root.getParts()');
-    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,childNodePart,nodePartBefore],'getParts() for the root DocumentPartRoot still shouldn\'t change');
+    assertEqualParts(root.getParts(),runningPartsExpectation,[nodePart,attributePart,childNodePart,nodePartBefore],'getParts() for the root DocumentPartRoot still shouldn\'t change');
     nodePart2.disconnect(); // Calling twice should be ok.
 
     childNodePart.disconnect();
     assert_equals(childNodePart.root,null,'root should be null after disconnect');
     assert_equals(childNodePart.previousSibling,null,'previousSibling should be null after disconnect');
     assert_equals(childNodePart.nextSibling,null,'nextSibling should be null after disconnect');
-    assert_array_equals(root.getParts(),[nodePartBefore,nodePart]);
+    assert_array_equals(root.getParts(),[nodePartBefore,nodePart,attributePart]);
   }, `Basic imperative DOM Parts object construction (${description})`);
 
   function cloneRange(parent,previousSibling,nextSibling) {
@@ -108,19 +126,21 @@ function addCleanup(t, part) {
   test((t) => {
     const root = doc.getPartRoot();
     const nodePart = addCleanup(t,new NodePart(root,target,{metadata:['node1']}));
+    const attributePart = addCleanup(t,new AttributePart(root,target,'attributeName',/*automatic*/false,{metadata: ['attribute']}));
+    const nonTrackedAttributePart = addCleanup(t,new AttributePart(root,target,'attributeName',/*automatic*/true,{metadata: ['attribute-auto']}));
     const childNodePart = addCleanup(t,new ChildNodePart(root,target.children[0], target.children[2],{metadata:['child']}));
     const nodePart3 = addCleanup(t,new NodePart(childNodePart,target.children[1].firstChild,{metadata: ['node 3']}));
     const nodePart2 = addCleanup(t,new NodePart(childNodePart,target.children[1].firstChild,{metadata: ['node 2']}));
     const childNodePart2 = addCleanup(t,new ChildNodePart(childNodePart,target.children[1].firstElementChild,target.children[1].firstElementChild.nextSibling,{metadata: ['childnodepart2']}));
-    let rootExpectations = [{type:'NodePart',metadata:['node1']},{type:'ChildNodePart',metadata:['child']}];
-    assertEqualParts(root.getParts(),rootExpectations,[nodePart,childNodePart],'setup');
+    let rootExpectations = [{type:'NodePart',metadata:['node1']},{type:'AttributePart',metadata:['attribute']},{type:'ChildNodePart',metadata:['child']}];
+    assertEqualParts(root.getParts(),rootExpectations,[nodePart,attributePart,childNodePart],'setup');
     let childExpectations = [{type:'NodePart',metadata:['node 3']},{type:'NodePart',metadata:['node 2']},{type:'ChildNodePart',metadata:['childnodepart2']}];
     assertEqualParts(childNodePart.getParts(),childExpectations,[nodePart3,nodePart2,childNodePart2],'setup');
     assert_array_equals(childNodePart2.getParts(),[]);
 
     // Test cloning of the entire DocumentPartRoot.
     const clonedPartRoot = root.clone();
-    assertEqualParts(root.getParts(),rootExpectations,[nodePart,childNodePart],'cloning a part root should not change the original');
+    assertEqualParts(root.getParts(),rootExpectations,[nodePart,attributePart,childNodePart],'cloning a part root should not change the original');
     const clonedContainer = clonedPartRoot.rootContainer;
     assert_true(clonedPartRoot instanceof DocumentPartRoot);
     assert_true(clonedContainer instanceof (useTemplate ? DocumentFragment : Document));
@@ -131,9 +151,14 @@ function addCleanup(t, part) {
     assert_true(!clonedPartRoot.getParts().includes(nodePart),'Original parts should not be retained');
     assert_true(!clonedPartRoot.getParts().includes(childNodePart));
     const newNodePart = clonedPartRoot.getParts()[0];
-    const newChildNodePart = clonedPartRoot.getParts()[1];
+    const newAttributePart = clonedPartRoot.getParts()[1];
+    const newChildNodePart = clonedPartRoot.getParts()[2];
     assert_not_equals(newNodePart.node,target,'Node references should not point to original nodes');
     assert_equals(newNodePart.node.id,target.id,'New parts should point to cloned nodes');
+    assert_not_equals(newAttributePart.node,target,'Node references should not point to original nodes');
+    assert_equals(newAttributePart.node.id,target.id,'New parts should point to cloned nodes');
+    assert_equals(newAttributePart.localName,attributePart.localName,'New attribute parts should carry over localName');
+    assert_equals(newAttributePart.automatic,attributePart.automatic,'New attribute parts should carry over automatic');
     assert_not_equals(newChildNodePart.previousSibling,a,'Node references should not point to original nodes');
     assert_equals(newChildNodePart.previousSibling.id,'a');
     assert_not_equals(newChildNodePart.nextSibling,c,'Node references should not point to original nodes');
diff --git a/tests/wpt/tests/editing/crashtests/replace-document-root-with-object-and-mo.html b/tests/wpt/tests/editing/crashtests/replace-document-root-with-object-and-mo.html
new file mode 100644
index 00000000000..bdad5414228
--- /dev/null
+++ b/tests/wpt/tests/editing/crashtests/replace-document-root-with-object-and-mo.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script>
+addEventListener("load", () => {
+  const object = document.querySelector("object[contenteditable]");
+  const mo = object.querySelector("mo");
+  const range = new Range();
+  document.replaceChildren();
+  range.insertNode(object);
+  object.replaceChild(mo, object.firstChild);
+});
+</script>
+</head>
+<object contenteditable>
+  <mo>
+  </mo>
+</object>
+</html>
diff --git a/tests/wpt/tests/editing/crashtests/set-input-value-of-editing-host-after-changing-type.html b/tests/wpt/tests/editing/crashtests/set-input-value-of-editing-host-after-changing-type.html
new file mode 100644
index 00000000000..34a15588965
--- /dev/null
+++ b/tests/wpt/tests/editing/crashtests/set-input-value-of-editing-host-after-changing-type.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<script>
+document.addEventListener("DOMContentLoaded", () => {
+  const input = document.querySelector("input");
+  input.focus();
+  input.type = "text";
+  input.value = "new value";
+}, {once: true});
+</script>
+</head>
+<body><input type="button" contenteditable></body>
+</html>
diff --git a/tests/wpt/tests/editing/other/exec-command-with-text-editor.tentative.html b/tests/wpt/tests/editing/other/exec-command-with-text-editor.tentative.html
index 207e74aef2d..e3b0931f166 100644
--- a/tests/wpt/tests/editing/other/exec-command-with-text-editor.tentative.html
+++ b/tests/wpt/tests/editing/other/exec-command-with-text-editor.tentative.html
@@ -320,6 +320,14 @@ function runTest(aTarget, aDescription) {
      beforeinputExpected: null,
      inputExpected: { inputType: "insertText", target: aTarget },
     },
+    {command: "inserttext", param: "",
+     value: "a[b]c", expectedValue: "a[]c",
+     expectedExecCommandResult: true,
+     expectedCommandSupported: true,
+     expectedCommandEnabled: true,
+     beforeinputExpected: null,
+     inputExpected: { inputType: "insertText", target: aTarget },
+    },
     {command: "justifyleft", param: null,
      value: "a[b]c", expectedValue: "a[b]c",
      expectedExecCommandResult: false,
diff --git a/tests/wpt/tests/editing/other/insertparagraph-in-editing-host-cannot-have-div.tentative.html b/tests/wpt/tests/editing/other/insertparagraph-in-editing-host-cannot-have-div.tentative.html
new file mode 100644
index 00000000000..fe6ea2c1837
--- /dev/null
+++ b/tests/wpt/tests/editing/other/insertparagraph-in-editing-host-cannot-have-div.tentative.html
@@ -0,0 +1,182 @@
+<!doctype html>
+<meta charset=utf-8>
+<meta name="timeout" content="long">
+
+<meta name="variant" content="?host=span&white-space=normal&display=block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre&display=block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-line&display=block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=normal&display=block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre&display=block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-line&display=block&command=insertText">
+
+<meta name="variant" content="?host=span&white-space=normal&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-line&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=normal&display=inline&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre&display=inline&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=inline&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-line&display=inline&command=insertText">
+
+<meta name="variant" content="?host=span&white-space=normal&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=pre-line&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=span&white-space=normal&display=inline-block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre&display=inline-block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-wrap&display=inline-block&command=insertText">
+<meta name="variant" content="?host=span&white-space=pre-line&display=inline-block&command=insertText">
+
+<meta name="variant" content="?host=p&white-space=normal&display=block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre&display=block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-line&display=block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=normal&display=block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre&display=block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-line&display=block&command=insertText">
+
+<meta name="variant" content="?host=p&white-space=normal&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-line&display=inline&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=normal&display=inline&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre&display=inline&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=inline&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-line&display=inline&command=insertText">
+
+<meta name="variant" content="?host=p&white-space=normal&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=pre-line&display=inline-block&command=insertParagraph">
+<meta name="variant" content="?host=p&white-space=normal&display=inline-block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre&display=inline-block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-wrap&display=inline-block&command=insertText">
+<meta name="variant" content="?host=p&white-space=pre-line&display=inline-block&command=insertText">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../include/editor-test-utils.js"></script>
+<link rel=stylesheet href=../include/reset.css>
+<title>Tests for inserting paragraph in editing host which cannot have &lt;div&gt; element as child</title>
+<body></body>
+<script>
+const params = new URLSearchParams(location.search);
+const tag = params.get("host");
+const whiteSpace = params.get("white-space");
+const isNewLineSignificant = whiteSpace == "pre" || whiteSpace == "pre-line" || whiteSpace == "pre-wrap";
+const display = params.get("display");
+const command = params.get("command");
+const editingHost = document.createElement(tag);
+editingHost.contentEditable = true;
+editingHost.style.whiteSpace = whiteSpace;
+editingHost.style.display = display;
+document.body.appendChild(editingHost);
+
+function execInsertTextOrParagraphCommand() {
+  if (command == "insertParagraph") {
+    document.execCommand(command);
+  } else {
+    // Inserting a linefeed by insertText command should be equivalent of insertParagraph.
+    document.execCommand(command, false, "\n");
+  }
+}
+
+const editingHostOpenTagAttrs = `contenteditable style="display:${display}; white-space:${whiteSpace}"`;
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`a[]b`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // A linefeed should be inserted if it's significant.  Otherwise, <br>.
+  assert_equals(
+    editingHost.innerHTML,
+    isNewLineSignificant ? "a\nb" : "a<br>b"
+  );
+}, `<${tag} ${editingHostOpenTagAttrs}>a[]b</${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<span style="white-space:normal">a[]b</span>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // A <br> element should be inserted if another <span> makes the linebreaks not significant.
+  assert_equals(editingHost.innerHTML, `<span style="white-space:normal">a<br>b</span>`);
+}, `<${tag} ${editingHostOpenTagAttrs}><span style="white-space:normal">a[]b</span></${tag}>`);
+
+if (isNewLineSignificant) {
+  test(() => {
+    const utils = new EditorTestUtils(editingHost);
+    utils.setupEditingHost(`<span style="white-space:normal"><span style="white-space:${whiteSpace}">a[]b</span></span>`);
+    editingHost.getBoundingClientRect();
+    execInsertTextOrParagraphCommand();
+    // A linefeed should be inserted even if `white-space` is changed by ancestor, but it's back to preformatted.
+    assert_equals(editingHost.innerHTML, `<span style="white-space:normal"><span style="white-space:${whiteSpace}">a\nb</span></span>`);
+  }, `<${tag} ${editingHostOpenTagAttrs}><span style="white-space:normal"><span style="white-space:${whiteSpace}">a[]b</span></span></${tag}>`);
+}
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<span style="display:block">a[]b</span>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // Split the internal <span> which is styled as block.
+  assert_equals(
+    editingHost.innerHTML,
+    `<span style="display:block">a</span><span style="display:block">b</span>`
+  );
+}, `<${tag} ${editingHostOpenTagAttrs}><span style="display:block;white-space:normal">a[]b</span></${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<div>a[]b</div>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // Although neither <span> nor <p> can have <div>, but if the insertion point is in the invalid <div>,
+  // browsers should just split the <div>.
+  assert_equals(editingHost.innerHTML, `<div>a</div><div>b</div>`);
+}, `<${tag} ${editingHostOpenTagAttrs}><div>a[]b</div></${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<div style="display:inline">a[]b</div>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // If <div> is styled as inline, it should be treated like <span>.
+  assert_equals(editingHost.innerHTML, `<div style="display:inline">a\nb</div>`);
+}, `<${tag} ${editingHostOpenTagAttrs}><div style="display:inline">a[]b</div></${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<div style="display:inline-block">a[]b</div>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // If <div> is styled as inline-block, it should be treated like <span>.
+  assert_equals(
+    editingHost.innerHTML,
+    isNewLineSignificant
+      ? `<div style="display:inline-block">a\nb</div>`
+      : `<div style="display:inline-block">a<br>b</div>`
+    );
+}, `<${tag} ${editingHostOpenTagAttrs}><div style="display:inline-block">a[]b</div></${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<div style="display:inline;white-space:normal">a[]b</div>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // If <div> is styled as inline, it should be treated like <span>.
+  assert_equals(editingHost.innerHTML, `<div style="display:inline;white-space:normal">a<br>b</div>`);
+}, `<${tag} ${editingHostOpenTagAttrs}><div style="display:inline;white-space:normal">a[]b</div></${tag}>`);
+
+test(() => {
+  const utils = new EditorTestUtils(editingHost);
+  utils.setupEditingHost(`<div style="display:inline-block;white-space:normal">a[]b</div>`);
+  editingHost.getBoundingClientRect();
+  execInsertTextOrParagraphCommand();
+  // If <div> is styled as inline-block, it should be treated like <span>.
+  assert_equals(editingHost.innerHTML, `<div style="display:inline-block;white-space:normal">a<br>b</div>`);
+}, `<${tag} ${editingHostOpenTagAttrs}><div style="display:inline-block;white-space:normal">a[]b</div></${tag}>`);
+</script>
diff --git a/tests/wpt/tests/editing/other/insertparagraph-in-inline-editing-host.tentative.html b/tests/wpt/tests/editing/other/insertparagraph-in-inline-editing-host.tentative.html
index 0df107c0804..9baed3f7fa6 100644
--- a/tests/wpt/tests/editing/other/insertparagraph-in-inline-editing-host.tentative.html
+++ b/tests/wpt/tests/editing/other/insertparagraph-in-inline-editing-host.tentative.html
@@ -167,6 +167,49 @@ for (const defaultParagraphSeparator of ["div", "p"]) {
     defaultParagraphSeparator
   })`);
 
+  promise_test(async t => {
+    editingHost.setAttribute(
+      "style",
+      `display:${display};white-space:${whiteSpace}`
+    );
+    const divElement = document.createElement("div");
+    divElement.textContent = "efg";
+    try {
+      container.appendChild(divElement);
+      utils.setupEditingHost("{}");
+      await utils.sendEnterKey(modifiers);
+      editingHost.removeAttribute("style");
+      // When the <span> element is followed by a <div>, making empty last
+      // line visible requires an invisible <br> after a line break.
+      if (!isPreformatted) {
+        assert_equals(
+          container.innerHTML,
+          '<span contenteditable=""><br><br></span><div>efg</div>',
+          `A <br> and additional <br> should be inserted when ${t.name}`
+        );
+      } else {
+        assert_in_array(
+          container.innerHTML,
+          [
+            `<span contenteditable="">\n\n</span><div>efg</div>`,
+            `<span contenteditable="">\n<br></span><div>efg</div>`,
+          ],
+          `A linefeed and additional line break should be inserted when ${t.name}`
+        );
+      }
+    } finally {
+      divElement.remove();
+    }
+  }, `${
+    testingInsertParagraph ? "insertParagraph" : "insertLineBreak"
+  } in <span contenteditable style="display:${
+    display
+  };white-space:${
+    whiteSpace
+  }">{}</span> followed by a <div> (defaultParagraphSeparator=${
+    defaultParagraphSeparator
+  })`);
+
   promise_test(async t => {
     editingHost.setAttribute(
       "style",
@@ -369,6 +412,49 @@ for (const defaultParagraphSeparator of ["div", "p"]) {
     defaultParagraphSeparator
   })`);
 
+  promise_test(async t => {
+    editingHost.setAttribute(
+      "style",
+      `display:${display};white-space:${whiteSpace}`
+    );
+    const divElement = document.createElement("div");
+    divElement.textContent = "efg";
+    try {
+      container.appendChild(divElement);
+      utils.setupEditingHost("abcd[]");
+      await utils.sendEnterKey(modifiers);
+      editingHost.removeAttribute("style");
+      // When the <span> element is followed by a <div>, making empty last
+      // line visible requires an invisible <br> after a line break.
+      if (!isPreformatted) {
+        assert_equals(
+          container.innerHTML,
+          '<span contenteditable="">abcd<br><br></span><div>efg</div>',
+          `A <br> and additional <br> should be inserted when ${t.name}`
+        );
+      } else {
+        assert_in_array(
+          container.innerHTML,
+          [
+            `<span contenteditable="">abcd\n<br></span><div>efg</div>`,
+            `<span contenteditable="">abcd\n\n</span><div>efg</div>`,
+          ],
+          `A linefeed and additional line break should be inserted when ${t.name}`
+        );
+      }
+    } finally {
+      divElement.remove();
+    }
+  }, `${
+    testingInsertParagraph ? "insertParagraph" : "insertLineBreak"
+  } in <span contenteditable style="display:${
+    display
+  };white-space:${
+    whiteSpace
+  }">abcd[]</span> followed by a <div> element (defaultParagraphSeparator=${
+    defaultParagraphSeparator
+  })`);
+
   promise_test(async t => {
     editingHost.setAttribute(
       "style",
diff --git a/tests/wpt/tests/editing/other/inserttext-after-bold-in-font-face-monospace.html b/tests/wpt/tests/editing/other/inserttext-after-bold-in-font-face-monospace.html
new file mode 100644
index 00000000000..cc937f28f8e
--- /dev/null
+++ b/tests/wpt/tests/editing/other/inserttext-after-bold-in-font-face-monospace.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div contenteditable><div><br></div></div>
+<script>
+"use strict";
+
+const editingHost = document.querySelector("div[contenteditable]");
+test(() => {
+  editingHost.focus();
+  document.execCommand("fontName", false, "monospace");
+  document.execCommand("insertText", false, "abc");
+  document.execCommand("insertParagraph");
+  document.execCommand("insertText", false, "def ");
+  document.execCommand("bold");
+  document.execCommand("insertText", false, "g");
+  assert_in_array(
+    editingHost.querySelector("div + div").innerHTML,
+    [
+      '<font face="monospace">def <b>g</b></font>',
+      '<font face="monospace">def <b>g<br></b></font>',
+    ]
+  );
+}, "");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js b/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js
index 99a0253ba6b..fca68358623 100644
--- a/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js
+++ b/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-decoder.any.js
@@ -47,6 +47,44 @@ decode([0x83, 0x36, 0xC8, 0x30], "\uE7C8", "legacy ICU special case 1");
 decode([0xA1, 0xAD], "\u2026", "legacy ICU special case 2");
 decode([0xA1, 0xAB], "\uFF5E", "legacy ICU special case 3");
 
+// GB18030-2022
+decode([0xA6, 0xD9], "\uFE10", "GB18030-2022 1");
+decode([0xA6, 0xDA], "\uFE12", "GB18030-2022 2");
+decode([0xA6, 0xDB], "\uFE11", "GB18030-2022 3");
+decode([0xA6, 0xDC], "\uFE13", "GB18030-2022 4");
+decode([0xA6, 0xDD], "\uFE14", "GB18030-2022 5");
+decode([0xA6, 0xDE], "\uFE15", "GB18030-2022 6");
+decode([0xA6, 0xDF], "\uFE16", "GB18030-2022 7");
+decode([0xA6, 0xEC], "\uFE17", "GB18030-2022 8");
+decode([0xA6, 0xED], "\uFE18", "GB18030-2022 9");
+decode([0xA6, 0xF3], "\uFE19", "GB18030-2022 10");
+decode([0xFE, 0x59], "\u9FB4", "GB18030-2022 11");
+decode([0xFE, 0x61], "\u9FB5", "GB18030-2022 12");
+decode([0xFE, 0x66], "\u9FB6", "GB18030-2022 13");
+decode([0xFE, 0x67], "\u9FB7", "GB18030-2022 14");
+decode([0xFE, 0x6D], "\u9FB8", "GB18030-2022 15");
+decode([0xFE, 0x7E], "\u9FB9", "GB18030-2022 16");
+decode([0xFE, 0x90], "\u9FBA", "GB18030-2022 17");
+decode([0xFE, 0xA0], "\u9FBB", "GB18030-2022 18");
+decode([0x82, 0x35, 0x90, 0x37], "\uE81E", "GB18030-2022 19");
+decode([0x82, 0x35, 0x90, 0x38], "\uE826", "GB18030-2022 20");
+decode([0x82, 0x35, 0x90, 0x39], "\uE82B", "GB18030-2022 21");
+decode([0x82, 0x35, 0x91, 0x30], "\uE82C", "GB18030-2022 22");
+decode([0x82, 0x35, 0x91, 0x31], "\uE832", "GB18030-2022 23");
+decode([0x82, 0x35, 0x91, 0x32], "\uE843", "GB18030-2022 24");
+decode([0x82, 0x35, 0x91, 0x33], "\uE854", "GB18030-2022 25");
+decode([0x82, 0x35, 0x91, 0x34], "\uE864", "GB18030-2022 26");
+decode([0x84, 0x31, 0x82, 0x36], "\uE78D", "GB18030-2022 27");
+decode([0x84, 0x31, 0x82, 0x37], "\uE78F", "GB18030-2022 28");
+decode([0x84, 0x31, 0x82, 0x38], "\uE78E", "GB18030-2022 29");
+decode([0x84, 0x31, 0x82, 0x39], "\uE790", "GB18030-2022 30");
+decode([0x84, 0x31, 0x83, 0x30], "\uE791", "GB18030-2022 31");
+decode([0x84, 0x31, 0x83, 0x31], "\uE792", "GB18030-2022 32");
+decode([0x84, 0x31, 0x83, 0x32], "\uE793", "GB18030-2022 33");
+decode([0x84, 0x31, 0x83, 0x33], "\uE794", "GB18030-2022 34");
+decode([0x84, 0x31, 0x83, 0x34], "\uE795", "GB18030-2022 35");
+decode([0x84, 0x31, 0x83, 0x35], "\uE796", "GB18030-2022 36");
+
 let i = 0;
 for (const range of ranges) {
   const pointer = range[0];
diff --git a/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html b/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html
index a6570c8d2b8..531d26084e2 100644
--- a/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html
+++ b/tests/wpt/tests/encoding/legacy-mb-schinese/gb18030/gb18030-encoder.html
@@ -24,6 +24,44 @@
  encode("\u2026", "%A1%AD", "legacy ICU special case 2");
  encode("\uFF5E", "%A1%AB", "legacy ICU special case 3");
 
+ // GB18030-2022
+ encode("\uFE10", "%A6%D9", "GB18030-2022 1");
+ encode("\uFE12", "%A6%DA", "GB18030-2022 2");
+ encode("\uFE11", "%A6%DB", "GB18030-2022 3");
+ encode("\uFE13", "%A6%DC", "GB18030-2022 4");
+ encode("\uFE14", "%A6%DD", "GB18030-2022 5");
+ encode("\uFE15", "%A6%DE", "GB18030-2022 6");
+ encode("\uFE16", "%A6%DF", "GB18030-2022 7");
+ encode("\uFE17", "%A6%EC", "GB18030-2022 8");
+ encode("\uFE18", "%A6%ED", "GB18030-2022 9");
+ encode("\uFE19", "%A6%F3", "GB18030-2022 10");
+ encode("\u9FB4", "%FEY", "GB18030-2022 11");
+ encode("\u9FB5", "%FEa", "GB18030-2022 12");
+ encode("\u9FB6", "%FEf", "GB18030-2022 13");
+ encode("\u9FB7", "%FEg", "GB18030-2022 14");
+ encode("\u9FB8", "%FEm", "GB18030-2022 15");
+ encode("\u9FB9", "%FE~", "GB18030-2022 16");
+ encode("\u9FBA", "%FE%90", "GB18030-2022 17");
+ encode("\u9FBB", "%FE%A0", "GB18030-2022 18");
+ encode("\uE78D", "%841%826", "GB18030-2022 19");
+ encode("\uE78E", "%841%828", "GB18030-2022 20");
+ encode("\uE78F", "%841%827", "GB18030-2022 21");
+ encode("\uE790", "%841%829", "GB18030-2022 22");
+ encode("\uE791", "%841%830", "GB18030-2022 23");
+ encode("\uE792", "%841%831", "GB18030-2022 24");
+ encode("\uE793", "%841%832", "GB18030-2022 25");
+ encode("\uE794", "%841%833", "GB18030-2022 26");
+ encode("\uE795", "%841%834", "GB18030-2022 27");
+ encode("\uE796", "%841%835", "GB18030-2022 28");
+ encode("\uE81E", "%825%907", "GB18030-2022 29");
+ encode("\uE826", "%825%908", "GB18030-2022 30");
+ encode("\uE82B", "%825%909", "GB18030-2022 31");
+ encode("\uE82C", "%825%910", "GB18030-2022 32");
+ encode("\uE832", "%825%911", "GB18030-2022 33");
+ encode("\uE843", "%825%912", "GB18030-2022 34");
+ encode("\uE854", "%825%913", "GB18030-2022 35");
+ encode("\uE864", "%825%914", "GB18030-2022 36");
+
  const upperCaseNibble = x => {
    return Math.floor(x).toString(16).toUpperCase();
  }
diff --git a/tests/wpt/tests/fenced-frame/automatic-beacon-no-opt-in.https.html b/tests/wpt/tests/fenced-frame/automatic-beacon-no-opt-in.https.html
new file mode 100644
index 00000000000..23cc1659220
--- /dev/null
+++ b/tests/wpt/tests/fenced-frame/automatic-beacon-no-opt-in.https.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>Test window.fence.setReportEventDataForAutomaticBeacons opt out</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="resources/utils.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<body>
+<script>
+promise_test(async (t) => {
+  const actions = new test_driver.Actions();
+  const fencedframe = await attachFencedFrameContext({
+    generator_api: "fledge",
+    automatic_beacon: true,
+  });
+  const new_url = new URL("resources/dummy.html", location.href);
+
+  await fencedframe.execute(
+    (new_url) => {
+      addEventListener("click", (event) => {
+        window.open(new_url, "_blank");
+      });
+    },
+    [new_url]
+  );
+
+  // An automatic beacon should not be sent out, as the document did not opt in
+  // through the call to setReportEventDataForAutomaticBeacons().
+  // Set up a timeout to ensure that there's enough time to send any potential
+  // automatic beacons.
+  await actions
+    .pointerMove(0, 0, { origin: fencedframe.element })
+    .pointerDown()
+    .pointerUp()
+    .send();
+  const timeout = new Promise(resolve => t.step_timeout(resolve, 1000));
+  const result = await Promise.race([nextAutomaticBeacon(), timeout]);
+  assert_true(typeof result === "undefined");
+}, "Automatic beacons will not send if the document does not opt in.");
+
+</script>
+</body>
diff --git a/tests/wpt/tests/fenced-frame/automatic-beacon-two-events-clear.https.html b/tests/wpt/tests/fenced-frame/automatic-beacon-two-events-clear.https.html
index 28a34bf8fbf..de4f1ea6730 100644
--- a/tests/wpt/tests/fenced-frame/automatic-beacon-two-events-clear.https.html
+++ b/tests/wpt/tests/fenced-frame/automatic-beacon-two-events-clear.https.html
@@ -40,14 +40,17 @@ promise_test(async(t) => {
   const received_beacon_data_1 = await nextAutomaticBeacon();
   assert_equals(received_beacon_data_1, beacon_data);
 
-  // The second click should not have any associated automatic beacon data, so
-  // an empty beacon should be sent.
+  // The second click should not have any associated automatic beacon info, so
+  // no beacon should be sent.
+  // Set up a timeout to ensure that there's enough time to send any potential
+  // automatic beacons.
   await actions.pointerMove(0, 0, {origin: fencedframe.element})
                .pointerDown()
                .pointerUp()
                .send();
-  const received_beacon_data_2 = await nextAutomaticBeacon();
-  assert_equals(received_beacon_data_2, "<No data>");
+  const timeout = new Promise(resolve => t.step_timeout(resolve, 1000));
+  const result = await Promise.race([nextAutomaticBeacon(), timeout]);
+  assert_true(typeof result === "undefined");
 }, 'Set expiring automatic beacon but trigger two events in a click handler');
 
 </script>
diff --git a/tests/wpt/tests/fenced-frame/cspee.https.html b/tests/wpt/tests/fenced-frame/cspee.https.html
index 7df3e882fa6..70c9744b743 100644
--- a/tests/wpt/tests/fenced-frame/cspee.https.html
+++ b/tests/wpt/tests/fenced-frame/cspee.https.html
@@ -9,22 +9,32 @@
 <body>
 <script>
 promise_test(async(t) => {
-  const iframe = attachIFrameContext({attributes:[["csp", "frame-src *"]]});
+  const iframe = attachIFrameContext({
+    attributes: [["csp", "frame-src *"]],
+    headers: [["Allow-CSP-From", "*"]]
+  });
   t.step_timeout(() => t.done(), 1000);
   await iframe.execute(async (t) => {
-    const fencedframe = attachFencedFrameContext();
+    const fencedframe = attachFencedFrameContext({
+      headers: [["Allow-CSP-From", "*"]]
+    });
     await fencedframe.execute(() => {});
   });
   assert_unreached("fenced frame should not be loaded.");
 }, 'fenced frame should not be loaded in CSPEE');
 
 promise_test(async(t) => {
-  const iframe_a = attachIFrameContext({attributes:[["csp", "frame-src *"]]});
+  const iframe_a = attachIFrameContext({
+    attributes: [["csp", "frame-src *"]],
+    headers: [["Allow-CSP-From", "*"]]
+  });
   t.step_timeout(() => t.done(), 1000);
   await iframe_a.execute(async (t) => {
-    const iframe_b = attachIFrameContext();
+    const iframe_b = attachIFrameContext({headers: [["Allow-CSP-From", "*"]]});
     await iframe_b.execute(async (t) => {
-      const fencedframe = attachFencedFrameContext();
+      const fencedframe = attachFencedFrameContext({
+        headers: [["Allow-CSP-From", "*"]]
+      });
       await fencedframe.execute(() => {});
     });
   });
@@ -32,16 +42,22 @@ promise_test(async(t) => {
 }, 'fenced frame should not be loaded if any ancestor has CSPEE');
 
 promise_test(async(t) => {
-  const iframe = attachIFrameContext({attributes:[["csp", "frame-src *"]]});
+  const iframe = attachIFrameContext({
+    attributes: [["csp", "frame-src *"]],
+    headers: [["Allow-CSP-From", "*"]]
+  });
   await iframe.execute(async (t) => {
     assert_false(navigator.canLoadAdAuctionFencedFrame());
   });
 }, 'canLoadOpaqueURL considers CSPEE headers');
 
 promise_test(async(t) => {
-  const iframe_a = attachIFrameContext({attributes:[["csp", "frame-src *"]]});
+  const iframe_a = attachIFrameContext({
+    attributes: [["csp", "frame-src *"]],
+    headers: [["Allow-CSP-From", "*"]]
+  });
   await iframe_a.execute(async (t) => {
-    const iframe_b = attachIFrameContext();
+    const iframe_b = attachIFrameContext({headers: [["Allow-CSP-From", "*"]]});
     await iframe_b.execute(async (t) => {
       assert_false(navigator.canLoadAdAuctionFencedFrame());
     });
diff --git a/tests/wpt/tests/fetch/api/response/response-consume-stream.any.js b/tests/wpt/tests/fetch/api/response/response-consume-stream.any.js
index befce620a3f..f89d7341ac6 100644
--- a/tests/wpt/tests/fetch/api/response/response-consume-stream.any.js
+++ b/tests/wpt/tests/fetch/api/response/response-consume-stream.any.js
@@ -59,3 +59,22 @@ test(function() {
 test(function() {
     assert_equals(Response.redirect("/").body, null);
 }, "Getting a redirect Response stream");
+
+promise_test(async function(test) {
+  var buffer = new ArrayBuffer(textData.length);
+
+  var body = new Response(textData).body;
+  const reader = body.getReader( {mode: 'byob'} );
+
+  let offset = 3;
+  while (offset < textData.length) {
+    const {done, value} = await reader.read(new Uint8Array(buffer, offset));
+    if (done) {
+      break;
+    }
+    buffer = value.buffer;
+    offset += value.byteLength;
+  }
+
+  validateBufferFromString(buffer, `\0\0\0\"This is response's bo`, 'Buffer should be validated');
+}, `Reading with offset from Response stream`);
diff --git a/tests/wpt/tests/fetch/fetch-later/timeout.tentative.https.window.js b/tests/wpt/tests/fetch/fetch-later/activate-after.tentative.https.window.js
similarity index 85%
rename from tests/wpt/tests/fetch/fetch-later/timeout.tentative.https.window.js
rename to tests/wpt/tests/fetch/fetch-later/activate-after.tentative.https.window.js
index ec47e756abe..08750dd3fe4 100644
--- a/tests/wpt/tests/fetch/fetch-later/timeout.tentative.https.window.js
+++ b/tests/wpt/tests/fetch/fetch-later/activate-after.tentative.https.window.js
@@ -15,14 +15,14 @@ parallelPromiseTest(async t => {
 
   // Loads an iframe that creates a fetchLater request w/ short timeout.
   const iframe = await loadScriptAsIframe(`
-    fetchLater("${url}", {activationTimeout: 1000});  // 1s
+    fetchLater("${url}", {activateAfter: 1000});  // 1s
   `);
   // Deletes the iframe to trigger deferred request sending.
   document.body.removeChild(iframe);
 
   // The iframe should have sent all requests.
   await expectBeacon(uuid, {count: 1});
-}, 'fetchLater() sends out based on activationTimeout.');
+}, 'fetchLater() sends out based on activateAfter.');
 
 parallelPromiseTest(async t => {
   const uuid = token();
@@ -35,9 +35,8 @@ parallelPromiseTest(async t => {
 
   // Creates a fetchLater request with short timeout. It should be sent out
   // even if the document is then put into BFCache.
-  // only be sent on page discarded (not on entering BFCache).
   await rc1.executeScript(url => {
-    fetchLater(url, {activationTimeout: 1000});  // 1.
+    fetchLater(url, {activateAfter: 1000});  // 1s.
     // Add a pageshow listener to stash the BFCache event.
     window.addEventListener('pageshow', e => {
       window.pageshowEvent = e;
@@ -53,4 +52,4 @@ parallelPromiseTest(async t => {
   }));
 
   await expectBeacon(uuid, {count: 1});
-}, 'fetchLater() sends out based on activationTimeout, even if document is in BFCache.');
+}, 'fetchLater() sends out based on activateAfter, even if document is in BFCache.');
diff --git a/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.window.js b/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.window.js
index 0870f1c273a..bf92716681e 100644
--- a/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.window.js
+++ b/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.window.js
@@ -19,8 +19,8 @@ test(() => {
 test(() => {
   assert_throws_js(
       RangeError,
-      () => fetchLater('https://www.google.com', {activationTimeout: -1}));
-}, `fetchLater() throws RangeError on negative activationTimeout.`);
+      () => fetchLater('https://www.google.com', {activateAfter: -1}));
+}, `fetchLater() throws RangeError on negative activateAfter.`);
 
 test(() => {
   const result = fetchLater('/');
diff --git a/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.worker.js b/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.worker.js
new file mode 100644
index 00000000000..17240db3543
--- /dev/null
+++ b/tests/wpt/tests/fetch/fetch-later/basic.tentative.https.worker.js
@@ -0,0 +1,6 @@
+importScripts('/resources/testharness.js');
+
+test(() => {
+  assert_false('fetchLater' in self);
+}, `fetchLater() is not supported in worker.`);
+done();
diff --git a/tests/wpt/tests/fetch/fetch-later/send-on-deactivate.tentative.https.window.js b/tests/wpt/tests/fetch/fetch-later/send-on-deactivate.tentative.https.window.js
index 4fbea12bfec..7a1ddc7ac3d 100644
--- a/tests/wpt/tests/fetch/fetch-later/send-on-deactivate.tentative.https.window.js
+++ b/tests/wpt/tests/fetch/fetch-later/send-on-deactivate.tentative.https.window.js
@@ -48,11 +48,11 @@ parallelPromiseTest(async t => {
       /*config=*/ null, /*options=*/ {features: 'noopener'});
 
   // When the remote is BFCached, creates a fetchLater request w/
-  // activationTimeout = 0s. It should be sent out immediately.
+  // activateAfter = 0s. It should be sent out immediately.
   await rc1.executeScript(url => {
     window.addEventListener('pagehide', e => {
       if (e.persisted) {
-        fetchLater(url, {activationTimeout: 0});
+        fetchLater(url, {activateAfter: 0});
       }
     });
     // Add a pageshow listener to stash the BFCache event.
@@ -70,7 +70,7 @@ parallelPromiseTest(async t => {
   }));
 
   await expectBeacon(uuid, {count: 1});
-}, `Call fetchLater() when BFCached with activationTimeout=0 sends immediately.`);
+}, `Call fetchLater() when BFCached with activateAfter=0 sends immediately.`);
 
 parallelPromiseTest(async t => {
   const uuid = token();
diff --git a/tests/wpt/tests/fetch/fetch-later/send-on-discard.tentative.https.window.js b/tests/wpt/tests/fetch/fetch-later/send-on-discard.tentative.https.window.js
index 8a39458f9b2..c4911b11055 100644
--- a/tests/wpt/tests/fetch/fetch-later/send-on-discard.tentative.https.window.js
+++ b/tests/wpt/tests/fetch/fetch-later/send-on-discard.tentative.https.window.js
@@ -36,8 +36,8 @@ parallelPromiseTest(async t => {
   const iframe = await loadScriptAsIframe(`
     const url = "${url}";
     for (let i = 0; i < ${numPerMethod}; i++) {
-      fetchLater(url, {method: 'GET', activationTimeout: 10000});  // 10s
-      fetchLater(url, {method: 'POST', activationTimeout: 8000});  // 8s
+      fetchLater(url, {method: 'GET', activateAfter: 10000});  // 10s
+      fetchLater(url, {method: 'POST', activateAfter: 8000});  // 8s
     }
   `);
   // Delete the iframe to trigger deferred request sending.
diff --git a/tests/wpt/tests/fledge/tentative/TODO b/tests/wpt/tests/fledge/tentative/TODO
index 2f3e72b2128..2b6a1dc3c2d 100644
--- a/tests/wpt/tests/fledge/tentative/TODO
+++ b/tests/wpt/tests/fledge/tentative/TODO
@@ -25,21 +25,18 @@ Need tests for (likely not a complete list):
     currently guaranteed to work, due to potential time skew between processes).
 * Multiple buyers.
 * Multiple interest groups with same owner.
-* Multiple frame tests (including join IG policy, run auction policy,
-    loading URNs in fencedframes in other frames, loading component
+* Multiple frame tests (including loading component
     ad URNs in fenced frames of other frames, etc)
 * adAuctionConfig passed to reportResult().
 * Component auctions.
   * Including cross-origin sellers.
-* clearOriginJoinedInterestGroups.
 * browserSignals fields in scoring/bidding methods.
-* In reporting methods, browserSignals fields: dataVersion, topLevelSeller,
+* In reporting methods, browserSignals fields: topLevelSeller,
     componentSeller, modifiedBid, adCost, madeHighestScoringOtherBid
     (with interest group from another origin).
 * Loading ads in iframes.
 * In fencedframes window.fence.setReportEventDataForAutomaticBeacons()
-* Calling leaveAdInterestGroup() in the frame of a winning ad (and one
-    of its component ads)
+* Automatic beacons (e.g., reserved.top_navigation)
 * Network timeouts.
 * Validate specific escaping behavior logic (still under discussion). There
     are a number of different rules for which characters are escaped, and
@@ -50,10 +47,27 @@ Need tests for (likely not a complete list):
     networks to send CORS preflights for requests made over local networks.
     Needs testing with public publisher pages running auctions with
     sellers / buyers / update URLs on local networks.
+* Calling FLEDGE APIs (or at least leaveAdInterestGroup() with no args)
+    in a non-ad FencedFrame.
+* Test network requests in terms of fetch behavior
+  * No cookies.
+  * No referrer.
+  * Redirects not followed.
+  * etc.
+* Test that await is not needed for same-origin interest groups
+  * Verify that's still in the spec/explainer first.
+* executionMode
+  * Including cross-origin join/leave behavior with "group-by-origin" mode.
+* Make sure state is not shared.
+  * Across scoreAd() / generateBid() calls, and with report calls.
+  * In "group-by-origin" execution mode across IGs joined from different
+      origins, and between generateBid() and reportWin().
+* Use AbortSignal to abort an auction.
 
 If possible:
 * Aggregate reporting.
-* Join/leave permission delegation via .well-known files.
+* Join/leave permission delegation via .well-known files
+  * Including tests for clearOriginJoinedInterestGroups().
 * k-anonymity.
 * Signals request batching. This is an optional feature, so can't require it,
     but maybe a test where batching could be used, and make sure things work,
diff --git a/tests/wpt/tests/fledge/tentative/abort.https.window.js b/tests/wpt/tests/fledge/tentative/abort.https.window.js
new file mode 100644
index 00000000000..b99d60dd528
--- /dev/null
+++ b/tests/wpt/tests/fledge/tentative/abort.https.window.js
@@ -0,0 +1,103 @@
+// META: script=/resources/testdriver.js
+// META: script=/common/utils.js
+// META: script=resources/fledge-util.sub.js
+// META: timeout=long
+
+"use strict;"
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  // To minimize the risk of the auction completing before the abort signal,
+  // make the bid script hand, and increase the per-buyer script timeout.
+  await joinInterestGroup(
+      test, uuid,
+      createBiddingScriptURL({generateBid: 'while(1);'}));
+
+  let abortController = new AbortController();
+  let promise = runBasicFledgeAuction(
+      test, uuid,
+      { signal: abortController.signal,
+        perBuyerTimeouts: {'*': 1000}
+      });
+  abortController.abort('reason');
+  try {
+    await promise;
+  } catch (e) {
+    assert_equals(e, 'reason');
+    return;
+  }
+  throw 'Exception unexpectedly not thrown';
+}, 'Abort auction.');
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  await joinInterestGroup(test, uuid);
+
+  let abortController = new AbortController();
+  abortController.abort('reason');
+  try {
+    await runBasicFledgeAuction(test, uuid, {signal: abortController.signal});
+  } catch (e) {
+    assert_equals(e, 'reason');
+    return;
+  }
+  throw 'Exception unexpectedly not thrown';
+}, 'Abort triggered before auction started.');
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  // This doesn't have the header to be loaded in a fenced frame, but can still
+  // check that it was requested, which is all this test needs.
+  let trackingRenderURL =
+      createTrackerURL(origin, uuid, `track_get`, `tracking_render_url`);
+
+  await joinInterestGroup(
+      test, uuid,
+      {ads: [{renderURL: trackingRenderURL}]});
+
+  let abortController = new AbortController();
+  let fencedFrameConfig = await runBasicFledgeTestExpectingWinner(
+      test, uuid, {signal: abortController.signal});
+
+  // Aborting now should have no effect - in particular, it should still be
+  // possible to navigate to the winning ad, and it should still send reports.
+  abortController.abort('reason');
+
+  // Load the fencedFrameConfig in a fenced frame, and make sure reports are
+  // still sent and the render URL still loaded.
+  createAndNavigateFencedFrame(test, fencedFrameConfig);
+  await waitForObservedRequests(
+      uuid,
+      [trackingRenderURL, createBidderReportURL(uuid), createSellerReportURL(uuid)]);
+}, 'Abort signalled after auction completes.');
+
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  await joinInterestGroup(
+    test, uuid,
+    { biddingLogicURL: createBiddingScriptURL(
+          { allowComponentAuction: true })});
+
+
+  let abortController = new AbortController();
+  let componentAuctionConfig = {
+    seller: window.location.origin,
+    decisionLogicURL: createDecisionScriptURL(uuid),
+    interestGroupBuyers: [window.location.origin],
+    signal: abortController.signal
+  };
+
+  let auctionConfigOverrides = {
+    decisionLogicURL: createDecisionScriptURL(uuid),
+    interestGroupBuyers: [],
+    componentAuctions: [componentAuctionConfig]
+  };
+
+  abortController.abort();
+  // Aborting a component auction has no effect.
+  await runBasicFledgeTestExpectingWinner(test, uuid, auctionConfigOverrides);
+}, 'Abort component auction.');
diff --git a/tests/wpt/tests/fledge/tentative/auction-config.https.sub.window.js b/tests/wpt/tests/fledge/tentative/auction-config.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/auction-config.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/auction-config.https.window.js
index 347f9eb5613..e4811b96965 100644
--- a/tests/wpt/tests/fledge/tentative/auction-config.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/auction-config.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fledge/tentative/clear-origin-joined-ad-interest-groups.https.window.js b/tests/wpt/tests/fledge/tentative/clear-origin-joined-ad-interest-groups.https.window.js
new file mode 100644
index 00000000000..7d6e715ac45
--- /dev/null
+++ b/tests/wpt/tests/fledge/tentative/clear-origin-joined-ad-interest-groups.https.window.js
@@ -0,0 +1,312 @@
+// META: script=/resources/testdriver.js
+// META: script=/common/utils.js
+// META: script=resources/fledge-util.sub.js
+// META: script=/common/subset-tests.js
+// META: timeout=long
+// META: variant=?1-4
+// META: variant=?5-8
+// META: variant=?9-12
+// META: variant=?13-last
+
+"use strict;"
+
+///////////////////////////////////////////////////////////////////////////////
+// Basic tests with no interest groups joined.
+///////////////////////////////////////////////////////////////////////////////
+
+subsetTest(promise_test, async test => {
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+}, 'clearOriginJoinedAdInterestGroups(), no groups joined, no group list.');
+
+subsetTest(promise_test, async test => {
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin, []);
+}, 'clearOriginJoinedAdInterestGroups(), no groups joined, group list.');
+
+subsetTest(promise_test, async test => {
+  try {
+    await navigator.clearOriginJoinedAdInterestGroups(OTHER_ORIGIN1);
+    throw 'Exception unexpectedly not thrown';
+  } catch (e) {
+    if (!(e instanceof DOMException) || e.name !== 'NotAllowedError') {
+      throw 'Wrong exception thrown: ' + e.toString();
+    }
+  }
+}, 'clearOriginJoinedAdInterestGroups(), cross-origin, no groups joined, no group list.');
+
+subsetTest(promise_test, async test => {
+  try {
+    await navigator.clearOriginJoinedAdInterestGroups(OTHER_ORIGIN1, []);
+    throw 'Exception unexpectedly not thrown';
+  } catch (e) {
+    if (!(e instanceof DOMException) || e.name !== 'NotAllowedError') {
+      throw 'Wrong exception thrown: ' + e.toString();
+    }
+  }
+}, 'clearOriginJoinedAdInterestGroups(), cross-origin, no groups joined, group list.');
+
+///////////////////////////////////////////////////////////////////////////////
+// Tests where interest groups are all owned by document.location.origin.
+///////////////////////////////////////////////////////////////////////////////
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Join 3 groups.
+  await joinInterestGroup(test, uuid);
+  await joinInterestGroup(test, uuid, {name: 'group 2'});
+  await joinInterestGroup(test, uuid, {name: 'group 3'});
+
+  // A single clear should leave them all.
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+
+  // Confirm that they were left.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid);
+}, 'clearOriginJoinedAdInterestGroups(), multiple groups joined, no group list.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  let group1ReportURL = createBidderReportURL(uuid, /*id=*/'1');
+  let group2ReportURL = createBidderReportURL(uuid, /*id=*/'2');
+  let group3ReportURL = createBidderReportURL(uuid, /*id=*/'3');
+
+  // Join 3 groups, with distinct report URLs and increasing bid amounts.
+  // Set "executionMode" to "group-by-origin" for two of them, since cross-origin
+  // leaves removes all groups joined from the other origin with that execution
+  // mode. Since clearOriginJoinedAdInterestGroups() only leaves interest
+  // groups joined on the current origin, the executionMode should not matter.
+  await joinInterestGroup(
+      test, uuid,
+      { name: 'group 1',
+        executionMode: 'group-by-origin',
+        biddingLogicURL: createBiddingScriptURL(
+            { bid: 1, reportWin: `sendReportTo("${group1ReportURL}");`})});
+  await joinInterestGroup(
+      test, uuid,
+      { name: 'group 2',
+        biddingLogicURL: createBiddingScriptURL(
+            { bid: 2, reportWin: `sendReportTo("${group2ReportURL}");`})});
+  await joinInterestGroup(
+      test, uuid,
+      { name: 'group 3',
+        executionMode: 'group-by-origin',
+        biddingLogicURL: createBiddingScriptURL(
+            { bid: 3, reportWin: `sendReportTo("${group3ReportURL}");`})});
+
+  // Group 3 should win an auction, since it bids the most.
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+  await waitForObservedRequests(
+      uuid, [group3ReportURL, createSellerReportURL(uuid)]);
+  await fetch(createCleanupURL(uuid));
+
+  // Clear, leaving group 1 in place, and run an auction, which group 1 should win.
+  await navigator.clearOriginJoinedAdInterestGroups(
+      window.location.origin, ['group 1']);
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+  await waitForObservedRequests(
+      uuid, [group1ReportURL, createSellerReportURL(uuid)]);
+
+  // Clear with an empty list, which should leave group 1 as well. Verify it can't
+  // win an auction.
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin, []);
+  await runBasicFledgeTestExpectingNoWinner(test, uuid);
+}, 'clearOriginJoinedAdInterestGroups(), multiple groups joined, group list.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Join an interest group in a same-origin top-level window.
+  await joinInterestGroupInTopLevelWindow(test, uuid, window.location.origin);
+
+  // Make sure it was joined.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+
+  // Call "clearOriginJoinedAdInterestGroups()", which should leave the interest
+  // group, since it was joined from a same-origin main frame.
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+
+  // Make sure group was left.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid);
+}, 'clearOriginJoinedAdInterestGroups(), group joined from same-origin top-level context.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Create top-level browsing context for another origin, and have it join an
+  // interest group owned by this document's origin.
+  let topLevelWindow = await createTopLevelWindow(test, OTHER_ORIGIN1);
+  let interestGroup = JSON.stringify(
+      createInterestGroupForOrigin(uuid, window.location.origin));
+  await runInFrame(test, topLevelWindow,
+                   `await joinCrossOriginInterestGroup(test_instance, "${uuid}",
+                                                       "${window.location.origin}",
+                                                       ${interestGroup});`);
+
+  // Call "clearOriginJoinedAdInterestGroups()", which should not leave the interest
+  // group, since it was joined from a cross-origin main frame.
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+
+  // Make sure group was not left.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+}, 'clearOriginJoinedAdInterestGroups(), group joined from cross-origin top-level context.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  await joinInterestGroup(test, uuid);
+
+  // In a cross-origin iframe, call clearOriginJoinedAdInterestGroups() both for the
+  // iframe's origin and for the main frame's origin. The latter should throw an
+  // exception, and neither should manage to leave the interest group.
+  let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
+  await runInFrame(test, iframe,
+                   `// Call clearOriginJoinedAdInterestGroups() with the iframe's origin.
+                    await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+                    try {
+                      // Call clearOriginJoinedAdInterestGroups() with the main frame's origin.
+                      await navigator.clearOriginJoinedAdInterestGroups("${window.location.origin}");
+                    } catch (e) {
+                      assert_true(e instanceof DOMException, "DOMException thrown");
+                      assert_equals(e.name, "NotAllowedError", "NotAllowedError DOMException thrown");
+                      return {result: "success"};
+                    }
+                    throw "Exception unexpectedly not thrown";`);
+
+  // Confirm that the interest group was not left.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+}, "clearOriginJoinedAdInterestGroups(), cross-origin iframe tries to leave parent frame's group.");
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // The possible results of calling clearOriginJoinedAdInterestGroups():
+
+  // Doesn't throw an exception.
+  const noExpectionURL = createTrackerURL(origin, uuid, "track_get", "no_exception");
+  // Throws the exception it's expected to.
+  const exceptionURL = createTrackerURL(origin, uuid, "track_get", "exception");
+  // Throws the wrong exception.
+  const badExpectionURL = createTrackerURL(origin, uuid, "track_get", "bad_exception");
+
+  // Create a render URL that calls clearOriginJoinedAdInterestGroups() and
+  // then requests one of the above tracking URLs, based on the resulting
+  // behaviot.
+  const renderURL = createRenderURL(
+      uuid,
+      `async function TryClear() {
+         try {
+           await navigator.clearOriginJoinedAdInterestGroups(
+               "${window.location.origin}");
+           await fetch("${noExpectionURL}");
+         } catch (e) {
+           if (e instanceof DOMException && e.name === "NotAllowedError") {
+             await fetch("${exceptionURL}");
+           } else {
+             await fetch("${badExpectionURL}");
+           }
+         }
+       }
+
+       TryClear();`);
+
+  await joinInterestGroup(
+      test, uuid,
+      {ads: [{ renderURL: renderURL}]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+
+  // This should wait until the clear call has thrown an exception.
+  await waitForObservedRequests(
+      uuid,
+      [createBidderReportURL(uuid), createSellerReportURL(uuid), exceptionURL]);
+
+  // Check the interest group was not left.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+}, 'clearOriginJoinedAdInterestGroups() in ad fenced frame throws an exception.');
+
+///////////////////////////////////////////////////////////////////////////////
+// Tests where some interest groups are owned by another origin.
+///////////////////////////////////////////////////////////////////////////////
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Join interest group in iframe and make sure it was joined.
+  let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
+  await runInFrame(test, iframe,
+                   `await joinInterestGroup(test_instance, "${uuid}");
+                    await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");`);
+
+  // In the main frame, Call clearOriginJoinedAdInterestGroups() for both the main
+  // frame's origin, and the origin of the iframe / joined interest group. Neither
+  // should leave the group, and the second should throw.
+  await navigator.clearOriginJoinedAdInterestGroups(window.location.origin);
+  try {
+    await navigator.clearOriginJoinedAdInterestGroups(OTHER_ORIGIN1);
+    throw 'Exception unexpectedly not thrown';
+  } catch (e) {
+    if (!(e instanceof DOMException) || e.name !== 'NotAllowedError') {
+      throw 'Wrong exception thrown: ' + e.toString();
+    }
+  }
+
+  // In an iframe, confirm the group was never left.
+  await runInFrame(test, iframe,
+      `await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");`);
+}, 'clearOriginJoinedAdInterestGroups(). Cross-origin interest group joined in iframe, try to clear in main frame.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
+  await runInFrame(test, iframe,
+                   `await joinInterestGroup(test_instance, "${uuid}");
+
+                    // Confirm that trying to clear the interest group using the main frame's
+                    // origin throws, and does not leave the group.
+                    try {
+                      await navigator.clearOriginJoinedAdInterestGroups("${window.location.origin}");
+                      throw 'Exception unexpectedly not thrown';
+                    } catch (e) {
+                      if (!(e instanceof DOMException) || e.name !== 'NotAllowedError') {
+                        throw 'Wrong exception thrown: ' + e.toString();
+                      }
+                    }
+                    await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");`);
+}, 'clearOriginJoinedAdInterestGroups(). Cross-origin interest group joined in iframe, clear call in iframe passing main frame origin.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
+  await runInFrame(test, iframe,
+                   `await joinInterestGroup(test_instance, "${uuid}");
+
+                    // Clear call with the origin of the cross-origin iframe.
+                    // This should successfully leave the interest group.
+                    await navigator.clearOriginJoinedAdInterestGroups("${OTHER_ORIGIN1}");
+
+                    // Verify the group was left.
+                    await runBasicFledgeTestExpectingNoWinner(test_instance, "${uuid}");`);
+}, 'clearOriginJoinedAdInterestGroups(). Cross-origin interest group joined in iframe, clear call in iframe passing iframe origin.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Join an OTHER_ORIGIN1 interest group in an OTHER_ORIGIN1 main frame.
+  let topLevelWindow = await createTopLevelWindow(test, OTHER_ORIGIN1);
+  await runInFrame(test, topLevelWindow,
+                   `await joinInterestGroup(test_instance, "${uuid}");`);
+
+  let iframe = await createIframe(test, OTHER_ORIGIN1, 'join-ad-interest-group');
+
+  await runInFrame(test, iframe,
+                   `// Clear call from an OTHER_ORIGIN1 iframe on a different
+                    // origin's main frame. This should not clear the interest
+                    // group that was just joined, because the joining origin
+                    // does not match.
+                    await navigator.clearOriginJoinedAdInterestGroups("${OTHER_ORIGIN1}");
+
+                    // Verify the group was not left.
+                    await runBasicFledgeTestExpectingWinner(test_instance, "${uuid}");`);
+}, 'clearOriginJoinedAdInterestGroups(). Cross-origin interest group joined from another joining origin, clear call in iframe.');
diff --git a/tests/wpt/tests/fledge/tentative/component-ads.https.sub.window.js b/tests/wpt/tests/fledge/tentative/component-ads.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/component-ads.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/component-ads.https.window.js
index ae639d7b20e..fb59045572f 100644
--- a/tests/wpt/tests/fledge/tentative/component-ads.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/component-ads.https.window.js
@@ -1,7 +1,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
 // META: script=/common/subset-tests.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: timeout=long
 // META: variant=?1-5
 // META: variant=?6-10
diff --git a/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js b/tests/wpt/tests/fledge/tentative/cross-origin.https.window.js
similarity index 85%
rename from tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/cross-origin.https.window.js
index 178b3284bd5..788558e5cf3 100644
--- a/tests/wpt/tests/fledge/tentative/cross-origin.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/cross-origin.https.window.js
@@ -1,7 +1,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
 // META: script=/common/subset-tests.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: timeout=long
 // META: variant=?1-4
 // META: variant=?5-8
@@ -10,100 +10,6 @@
 
 "use strict;"
 
-const OTHER_ORIGIN1 = 'https://{{hosts[alt][]}}:{{ports[https][0]}}';
-const OTHER_ORIGIN2 = 'https://{{hosts[alt][]}}:{{ports[https][1]}}';
-const OTHER_ORIGIN3 = 'https://{{hosts[][]}}:{{ports[https][1]}}';
-const OTHER_ORIGIN4 = 'https://{{hosts[][www]}}:{{ports[https][0]}}';
-const OTHER_ORIGIN5 = 'https://{{hosts[][www]}}:{{ports[https][1]}}';
-const OTHER_ORIGIN6 = 'https://{{hosts[alt][www]}}:{{ports[https][0]}}';
-const OTHER_ORIGIN7 = 'https://{{hosts[alt][www]}}:{{ports[https][1]}}';
-
-// Runs "script" in "child_window" via an eval call. The "child_window" must
-// have been created by calling "createFrame()" below. "param" is passed to the
-// context "script" is run in, so can be used to pass objects that
-// "script" references that can't be serialized to a string, like
-// fencedFrameConfigs.
-async function runInFrame(test, child_window, script, param) {
-  const messageUuid = generateUuid(test);
-  let receivedResponse = {};
-
-  let promise = new Promise(function(resolve, reject) {
-    function WaitForMessage(event) {
-      if (event.data.messageUuid != messageUuid)
-        return;
-      receivedResponse = event.data;
-      if (event.data.result === 'success') {
-        resolve();
-      } else {
-        reject(event.data.result);
-      }
-    }
-    window.addEventListener('message', WaitForMessage);
-    child_window.postMessage(
-        {messageUuid: messageUuid, script: script, param: param}, '*');
-  });
-  await promise;
-  return receivedResponse.returnValue;
-}
-
-// Creates an frame and navigates it to a URL on "origin", and waits for the URL
-// to finish loading by waiting for the frame to send an event. Then returns
-// the frame's Window object. Depending on the value of "is_iframe", the created
-// frame will either be a new iframe, or a new top-level main frame. In the iframe
-// case, its "allow" field will be set to "permissions".
-//
-// Also adds a cleanup callback to "test", which runs all cleanup functions
-// added within the frame and waits for them to complete, and then destroys the
-// iframe or closes the window.
-async function createFrame(test, origin, is_iframe = true, permissions = null) {
-  const frameUuid = generateUuid(test);
-  const frameUrl =
-      `${origin}${RESOURCE_PATH}subordinate-frame.sub.html?uuid=${frameUuid}`;
-  let promise = new Promise(function(resolve, reject) {
-    function WaitForMessage(event) {
-      if (event.data.messageUuid != frameUuid)
-        return;
-      if (event.data.result === 'load complete') {
-        resolve();
-      } else {
-        reject(event.data.result);
-      }
-    }
-    window.addEventListener('message', WaitForMessage);
-  });
-
-  if (is_iframe) {
-    let iframe = document.createElement('iframe');
-    if (permissions)
-      iframe.allow = permissions;
-    iframe.src = frameUrl;
-    document.body.appendChild(iframe);
-
-    test.add_cleanup(async () => {
-      await runInFrame(test, iframe.contentWindow, "await test_instance.do_cleanup();");
-      document.body.removeChild(iframe);
-    });
-
-    await promise;
-    return iframe.contentWindow;
-  }
-
-  let child_window = window.open(frameUrl);
-  test.add_cleanup(async () => {
-    await runInFrame(test, child_window, "await test_instance.do_cleanup();");
-    child_window.close();
-  });
-
-  await promise;
-  return child_window;
-}
-
-// Wrapper around createFrame() that creates an iframe and optionally sets
-// permissions.
-async function createIframe(test, origin, permissions) {
-  return createFrame(test, origin, /*is_iframe=*/ true, permissions);
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // Join interest group in iframe tests.
 ////////////////////////////////////////////////////////////////////////////////
@@ -190,7 +96,14 @@ subsetTest(promise_test, async test => {
   // grant permission. The case where permission is granted is not yet testable.
   let interestGroup = JSON.stringify(createInterestGroupForOrigin(uuid, window.location.origin));
   await runInFrame(test, iframe,
-                    `joinInterestGroup(test_instance, "${uuid}", ${interestGroup})`);
+                   `try {
+                      await joinInterestGroup(test_instance, "${uuid}", ${interestGroup});
+                    } catch (e) {
+                      assert_true(e instanceof DOMException, "DOMException thrown");
+                      assert_equals(e.name, "NotAllowedError", "NotAllowedError DOMException thrown");
+                      return {result: "success"};
+                    }
+                    return "exception unexpectedly not thrown";`);
 
   // Run an auction with this page's origin as a bidder. Since the join
   // should have failed, the auction should have no winner.
diff --git a/tests/wpt/tests/fledge/tentative/generate-bid-recency.https.sub.window.js b/tests/wpt/tests/fledge/tentative/generate-bid-recency.https.window.js
similarity index 95%
rename from tests/wpt/tests/fledge/tentative/generate-bid-recency.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/generate-bid-recency.https.window.js
index b4c059820ed..07da463a2dc 100644
--- a/tests/wpt/tests/fledge/tentative/generate-bid-recency.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/generate-bid-recency.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: timeout=long
 
 "use strict;"
diff --git a/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.js b/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.js
new file mode 100644
index 00000000000..1bf5d017b2c
--- /dev/null
+++ b/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group-in-fenced-frame.https.window.js
@@ -0,0 +1,370 @@
+// META: script=/resources/testdriver.js
+// META: script=/common/utils.js
+// META: script=resources/fledge-util.sub.js
+// META: script=/common/subset-tests.js
+// META: timeout=long
+// META: variant=?1-4
+// META: variant=?5-8
+// META: variant=?9-last
+
+"use strict;"
+
+// These are separate from the other join-leave tests because these all create
+// and navigate fenced frames, which is much slower than just joining/leaving
+// interest groups, and running the occasional auction. Most tests use a
+// buyer with an origin of OTHER_ORIGIN1, so it has a distinct origin from the
+// seller and publisher.
+
+// Creates a tracker URL that's requested when a call succeeds in a fenced
+// frame.
+function createSuccessURL(uuid, origin = document.location.origin) {
+  return createTrackerURL(origin, uuid, "track_get", "success");
+}
+
+// Creates a tracker URL that's requested when a call fails in a fenced frame, with
+// the expected exception.
+function createExceptionURL(uuid, origin = document.location.origin) {
+  return createTrackerURL(origin, uuid, "track_get", "exception");
+}
+
+// Creates a tracker URL that's requested when joinAdInterestGroup() or
+// leaveAdInterestGroup() fails with an exception other than the one that's
+// expected.
+function createBadExceptionURL(uuid, origin = document.location.origin) {
+  return createTrackerURL(origin, uuid, "track_get", "bad_exception");
+}
+
+// Creates render URL that calls "navigator.leaveAdInterestGroup()" when
+// loaded, with no arguments. It then fetches a URL depending on whether it
+// threw an exception. No exception should ever be thrown when this is run
+// in an ad URL, so only fetch the "bad exception" URL on error.
+function createNoArgsTryLeaveRenderURL(uuid, origin = document.location.origin) {
+  return createRenderURL(
+    uuid,
+    `async function TryLeave() {
+       try {
+         await navigator.leaveAdInterestGroup();
+         await fetch("${createSuccessURL(uuid, origin)}");
+       } catch (e) {
+         await fetch("${createBadExceptionURL(uuid, origin)}");
+       }
+     }
+
+     TryLeave();`,
+    /*signalsParams=*/null,
+    origin);
+}
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Interest group that an ad fenced frame attempts to join. The join should
+  // fail.
+  let interestGroupJoinedInFrame = createInterestGroupForOrigin(
+      uuid, document.location.origin, {name: 'group2'});
+
+  // Create a render URL that tries to join "interestGroupJoinedInFrame".
+  const renderURL = createRenderURL(
+    uuid,
+    `async function TryJoin() {
+       try {
+         await navigator.joinAdInterestGroup(
+             ${JSON.stringify(interestGroupJoinedInFrame)});
+         await fetch("${createSuccessURL(uuid)}");
+       } catch (e) {
+         if (e instanceof DOMException && e.name === "NotAllowedError") {
+           await fetch("${createExceptionURL(uuid)}");
+         } else {
+           await fetch("${createBadExceptionURL(uuid)}");
+         }
+       }
+     }
+
+     TryJoin();`);
+
+  await joinInterestGroup(test, uuid, {ads: [{ renderURL: renderURL}]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+
+  // This should wait until the leave call has thrown an exception.
+  await waitForObservedRequests(
+      uuid,
+      [createBidderReportURL(uuid), createSellerReportURL(uuid), createExceptionURL(uuid)]);
+
+  // Leave the initial interest group.
+  await leaveInterestGroup();
+
+  // Check the interest group was not successfully joined in the fenced frame
+  // by running an auction, to make sure the thrown exception accurately
+  // indicates the group wasn't joined.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid);
+}, 'joinAdInterestGroup() in ad fenced frame.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Create a render URL that tries to leave the default test interest group by
+  // name. Even a though a render URL can leave its own interest group by using
+  // the 0-argument version of leaveAdInterestGroup(), it can't leave its own
+  // interest group by using the 1-argument version, so this should fail.
+  const renderURL = createRenderURL(
+      uuid,
+      `async function TryLeave() {
+         try {
+           await navigator.leaveAdInterestGroup(
+               {owner: "${window.location.origin}", name: "${DEFAULT_INTEREST_GROUP_NAME}"});
+           await fetch("${createSuccessURL(uuid)}");
+         } catch (e) {
+           if (e instanceof DOMException && e.name === "NotAllowedError") {
+             await fetch("${createExceptionURL(uuid)}");
+           } else {
+             await fetch("${createBadExceptionURL(uuid)}");
+           }
+         }
+       }
+
+       TryLeave();`);
+
+  await joinInterestGroup(
+      test, uuid,
+      {ads: [{ renderURL: renderURL}]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+
+  // This should wait until the leave call has thrown an exception.
+  await waitForObservedRequests(
+      uuid,
+      [createBidderReportURL(uuid), createSellerReportURL(uuid), createExceptionURL(uuid)]);
+
+  // Check the interest group was not left.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+}, 'leaveAdInterestGroup() in ad fenced frame, specify an interest group.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = window.location.origin;
+
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: createNoArgsTryLeaveRenderURL(uuid, render_url_origin) }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+
+  // Leaving the interest group should claim to succeed, to avoid leaking
+  // whether or not the buyer was same-origin or to the fenced frame.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, render_url_origin)]);
+
+  // Check the interest group was not actually left.
+  await runBasicFledgeTestExpectingWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in non-buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = OTHER_ORIGIN1;
+
+  // Use a different origin for the buyer, to make sure that's the origin
+  // that matters.
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: createNoArgsTryLeaveRenderURL(uuid, render_url_origin) }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+
+  // This should wait until the leave call has completed.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, render_url_origin)]);
+
+  // Check the interest group was actually left.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = OTHER_ORIGIN1;
+  const iframe_origin = OTHER_ORIGIN1;
+
+  // Create a render URL which, in an iframe, loads the common "try leave"
+  // render URL from the buyer's origin (which isn't technically being used as
+  // a render URL, in this case).
+  const renderURL = createRenderURL(
+      uuid,
+      `let iframe = document.createElement("iframe");
+       iframe.permissions = "join-ad-interest-group";
+       iframe.src = "${createNoArgsTryLeaveRenderURL(uuid, iframe_origin)}";
+       document.body.appendChild(iframe);`,
+      /*signalsParams=*/null,
+      render_url_origin);
+
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: renderURL }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+
+  // This should wait until the leave call has completed.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, iframe_origin)]);
+
+  // Check the interest group was actually left.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in same-origin iframe inside buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = OTHER_ORIGIN1;
+  const iframe_origin = document.location.origin;
+
+  // Create a render URL which, in an iframe, loads the common "try leave"
+  // render URL from an origin other than the buyer's origin.
+  const renderURL = createRenderURL(
+      uuid,
+      `let iframe = document.createElement("iframe");
+       iframe.permissions = "join-ad-interest-group";
+       iframe.src = "${createNoArgsTryLeaveRenderURL(uuid, iframe_origin)}";
+       document.body.appendChild(iframe);`,
+      /*signalsParams=*/null,
+      render_url_origin);
+
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: renderURL }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+
+  // Leaving the interest group should claim to succeed, to avoid leaking
+  // whether or not the buyer was same-origin or to the iframe.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, iframe_origin)]);
+
+  // Check the interest group was not actually left.
+  await runBasicFledgeTestExpectingWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in cross-origin iframe inside buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = document.location.origin;
+  const iframe_origin = document.location.origin;
+
+  // Create a render URL which, in an iframe, loads the common "try leave"
+  // render URL from an origin other than the buyer's origin (which isn't
+  // technically being used as a render URL, in this case).
+  const renderURL = createRenderURL(
+      uuid,
+      `let iframe = document.createElement("iframe");
+       iframe.permissions = "join-ad-interest-group";
+       iframe.src = "${createNoArgsTryLeaveRenderURL(uuid, iframe_origin)}";
+       document.body.appendChild(iframe);`,
+      /*signalsParams=*/null,
+      render_url_origin);
+
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: renderURL }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+
+  // Leaving the interest group should claim to succeed, to avoid leaking
+  // whether or not the buyer was same-origin or to the fenced frame.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, iframe_origin)]);
+
+  // Check the interest group was not actually left.
+  await runBasicFledgeTestExpectingWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in same-origin iframe inside non-buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  const bidder_origin = OTHER_ORIGIN1;
+  const render_url_origin = document.location.origin;
+  const iframe_origin = OTHER_ORIGIN1;
+
+  // Create a render URL which, in an iframe, loads the common "try leave"
+  // render URL from the buyer's origin (which isn't technically being used as
+  // a render URL, in this case).
+  const renderURL = createRenderURL(
+      uuid,
+      `let iframe = document.createElement("iframe");
+       iframe.permissions = "join-ad-interest-group";
+       iframe.src = "${createNoArgsTryLeaveRenderURL(uuid, iframe_origin)}";
+       document.body.appendChild(iframe);`,
+      /*signalsParams=*/null,
+      render_url_origin);
+
+  await joinCrossOriginInterestGroup(
+      test, uuid, bidder_origin,
+      {ads: [{ renderURL: renderURL }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, {interestGroupBuyers : [bidder_origin]});
+  // Leaving the interest group should succeed.
+  await waitForObservedRequests(
+      uuid,
+      [ createBidderReportURL(uuid), createSellerReportURL(uuid),
+        createSuccessURL(uuid, iframe_origin)]);
+
+  // Check the interest group was left.
+  await runBasicFledgeTestExpectingNoWinner(test, uuid, {interestGroupBuyers : [bidder_origin]});
+}, 'leaveAdInterestGroup() in cross-origin buyer iframe inside non-buyer origin ad fenced frame, no parameters.');
+
+subsetTest(promise_test, async test => {
+  const uuid = generateUuid(test);
+
+  // Render URL that loads the first ad component in a nested fenced frame.
+  let loadFirstComponentAdURL =
+      createRenderURL(
+        uuid,
+        `let fencedFrame = document.createElement("fencedframe");
+         fencedFrame.mode = "opaque-ads";
+         fencedFrame.config = window.fence.getNestedConfigs()[0];
+         document.body.appendChild(fencedFrame);`,
+        /*signalsParams=*/null,
+        OTHER_ORIGIN1);
+
+  await joinInterestGroup(
+      test, uuid,
+      // Interest group that makes a bid with a component ad. The render URL
+      // will open the component ad in a fenced frame, and the component ad
+      // URL is the common URL that tries to leave the ad's current interest
+      // group, reporting the result to a tracker URL.
+      { biddingLogicURL: createBiddingScriptURL(
+          { generateBid: `return {
+                            bid: 1,
+                            render: interestGroup.ads[0].renderURL,
+                            adComponents: [interestGroup.adComponents[0].renderURL]
+                          };` }),
+        ads: [{ renderURL: loadFirstComponentAdURL }],
+        adComponents: [{ renderURL: createNoArgsTryLeaveRenderURL(uuid) }]});
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid);
+
+  // Leaving the interest group should claim to succeed, to avoid leaking
+  // whether or not the buyer was same-origin or to the fenced frame.
+  await waitForObservedRequests(
+      uuid,
+      [createSellerReportURL(uuid), createSuccessURL(uuid)]);
+
+  // Check the interest group was not actually left - component ads are not currently
+  // allowed to leave interest groups, even if same origin.
+  await runBasicFledgeTestExpectingWinner(test, uuid);
+}, 'leaveAdInterestGroup() in component ad fenced frame, no parameters.');
diff --git a/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js b/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.window.js
similarity index 98%
rename from tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.window.js
index 85e172ed6f8..77da23a7a5b 100644
--- a/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/join-leave-ad-interest-group.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-10
@@ -637,3 +637,14 @@ subsetTest(promise_test, async test => {
   await joinInterestGroup(test, uuid, {}, -600);
   assert_true(await runBasicFledgeAuction(test, uuid) === null);
 }, 'Interest group test with overwritten duration of -600.');
+
+subsetTest(promise_test, async test => {
+  try {
+    await navigator.leaveAdInterestGroup();
+  } catch (e) {
+    assert_true(e instanceof TypeError, 'TypeError thrown');
+    return;
+  }
+
+  throw 'TypeError unexpectedly not thrown.'
+}, 'leaveInterestGroup() with no parameters, outside of a fenced frame.');
diff --git a/tests/wpt/tests/fledge/tentative/no-winner.https.sub.window.js b/tests/wpt/tests/fledge/tentative/no-winner.https.window.js
similarity index 98%
rename from tests/wpt/tests/fledge/tentative/no-winner.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/no-winner.https.window.js
index 229a707b099..f252aece5bf 100644
--- a/tests/wpt/tests/fledge/tentative/no-winner.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/no-winner.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fledge/tentative/register-ad-beacon.https.sub.window.js b/tests/wpt/tests/fledge/tentative/register-ad-beacon.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/register-ad-beacon.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/register-ad-beacon.https.window.js
index 7f9053d5244..19fab2ac1b1 100644
--- a/tests/wpt/tests/fledge/tentative/register-ad-beacon.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/register-ad-beacon.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fledge/tentative/reporting-arguments.https.sub.window.js b/tests/wpt/tests/fledge/tentative/reporting-arguments.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/reporting-arguments.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/reporting-arguments.https.window.js
index b68341c62a1..d652bf2835c 100644
--- a/tests/wpt/tests/fledge/tentative/reporting-arguments.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/reporting-arguments.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fledge/tentative/resources/bidding-logic.sub.py b/tests/wpt/tests/fledge/tentative/resources/bidding-logic.sub.py
index 89707470d25..58fe220880a 100644
--- a/tests/wpt/tests/fledge/tentative/resources/bidding-logic.sub.py
+++ b/tests/wpt/tests/fledge/tentative/resources/bidding-logic.sub.py
@@ -34,19 +34,25 @@ def main(request, response):
     if error == b"no-body":
         return body
     if error != b"no-generateBid":
-        body += b"""
+        # Use bid query param if present. Otherwise, use a bid of 9.
+        bid = (request.GET.first(b"bid", None) or b"9").decode("ASCII")
+
+        allowComponentAuction = ""
+        allowComponentAuctionParam = request.GET.first(b"allowComponentAuction", None)
+        if allowComponentAuctionParam != None:
+          allowComponentAuction = f"allowComponentAuction: {allowComponentAuctionParam.decode('ASCII')},"
+
+        body += f"""
             function generateBid(interestGroup, auctionSignals, perBuyerSignals,
                                 trustedBiddingSignals, browserSignals,
-                                directFromSellerSignals) {
-              {{GET[generateBid]}};
-              return {
-                'bid': 9,
-                'render': interestGroup.ads[0].renderURL
-              };
-            }"""
-    bid = request.GET.first(b"bid", None)
-    if bid != None:
-      body = body.replace(b"9", bid)
+                                directFromSellerSignals) {{
+              {{{{GET[generateBid]}}}};
+              return {{
+                bid: {bid},
+                {allowComponentAuction}
+                render: interestGroup.ads[0].renderURL
+              }};
+            }}""".encode()
     if error != b"no-reportWin":
         body += b"""
             function reportWin(auctionSignals, perBuyerSignals, sellerSignals,
diff --git a/tests/wpt/tests/fledge/tentative/resources/fenced-frame.sub.py b/tests/wpt/tests/fledge/tentative/resources/fenced-frame.sub.py
index a3cc488a058..a8f32b6e1ef 100644
--- a/tests/wpt/tests/fledge/tentative/resources/fenced-frame.sub.py
+++ b/tests/wpt/tests/fledge/tentative/resources/fenced-frame.sub.py
@@ -9,11 +9,11 @@ def main(request, response):
         <!DOCTYPE html>
         <html>
         <head>
-        <!--- Allow injected scripts to use functions in fledge-util.js --->
+        <!--- Allow injected scripts to use functions in fledge-util.sub.js --->
         <base href="..">
         <script src="/resources/testharness.js"></script>
         <script src="/common/utils.js"></script>
-        <script src="resources/fledge-util.js"></script>
+        <script src="resources/fledge-util.sub.js"></script>
         </head>
         <body>
         <script>
diff --git a/tests/wpt/tests/fledge/tentative/resources/fledge-util.js b/tests/wpt/tests/fledge/tentative/resources/fledge-util.sub.js
similarity index 75%
rename from tests/wpt/tests/fledge/tentative/resources/fledge-util.js
rename to tests/wpt/tests/fledge/tentative/resources/fledge-util.sub.js
index c89814507cb..d500307a079 100644
--- a/tests/wpt/tests/fledge/tentative/resources/fledge-util.js
+++ b/tests/wpt/tests/fledge/tentative/resources/fledge-util.sub.js
@@ -16,6 +16,16 @@ const TRUSTED_BIDDING_SIGNALS_URL =
 const TRUSTED_SCORING_SIGNALS_URL =
     `${BASE_URL}resources/trusted-scoring-signals.py`;
 
+// Other origins that should all be distint from the main frame origin
+// that the tests start with.
+const OTHER_ORIGIN1 = 'https://{{hosts[alt][]}}:{{ports[https][0]}}';
+const OTHER_ORIGIN2 = 'https://{{hosts[alt][]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN3 = 'https://{{hosts[][]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN4 = 'https://{{hosts[][www]}}:{{ports[https][0]}}';
+const OTHER_ORIGIN5 = 'https://{{hosts[][www]}}:{{ports[https][1]}}';
+const OTHER_ORIGIN6 = 'https://{{hosts[alt][www]}}:{{ports[https][0]}}';
+const OTHER_ORIGIN7 = 'https://{{hosts[alt][www]}}:{{ports[https][1]}}';
+
 // Creates a URL that will be sent to the URL request tracker script.
 // `uuid` is used to identify the stash shard to use.
 // `dispatch` affects what the tracker script does.
@@ -30,6 +40,13 @@ function createTrackerURL(origin, uuid, dispatch, id = null) {
   return url.toString();
 }
 
+// Create a URL that when fetches clears tracked URLs. Note that the origin
+// doesn't matter - it will clean up all tracked URLs with the provided uuid,
+// regardless of origin they were fetched from.
+function createCleanupURL(uuid) {
+  return createTrackerURL(window.location.origin, uuid, 'clean_up');
+}
+
 // Create tracked bidder/seller URLs. The only difference is the prefix added
 // to the `id` passed to createTrackerURL. The optional `id` field allows
 // multiple bidder/seller report URLs to be distinguishable from each other.
@@ -55,8 +72,8 @@ function createSellerBeaconURL(uuid, id = '1', origin = window.location.origin)
 function generateUuid(test) {
   let uuid = token();
   test.add_cleanup(async () => {
-    let cleanupURL = createTrackerURL(window.location.origin, uuid, 'clean_up');
-    let response = await fetch(cleanupURL, {credentials: 'omit', mode: 'cors'});
+    let response = await fetch(createCleanupURL(uuid),
+                               {credentials: 'omit', mode: 'cors'});
     assert_equals(await response.text(), 'cleanup complete',
                   `Sever state cleanup failed`);
   });
@@ -134,6 +151,8 @@ function createBiddingScriptURL(params = {}) {
     url.searchParams.append('error', params.error);
   if (params.bid)
     url.searchParams.append('bid', params.bid);
+  if (params.allowComponentAuction !== undefined)
+    url.searchParams.append('allowComponentAuction', JSON.stringify(params.allowComponentAuction))
   return url.toString();
 }
 
@@ -386,3 +405,119 @@ async function runReportTest(test, uuid, codeToInsert, expectedReportURLs,
       { decisionLogicURL: createDecisionScriptURL(uuid, decisionScriptURLParams) });
   await waitForObservedRequests(uuid, expectedReportURLs);
 }
+
+// Runs "script" in "child_window" via an eval call. The "child_window" must
+// have been created by calling "createFrame()" below. "param" is passed to the
+// context "script" is run in, so can be used to pass objects that
+// "script" references that can't be serialized to a string, like
+// fencedFrameConfigs.
+async function runInFrame(test, child_window, script, param) {
+  const messageUuid = generateUuid(test);
+  let receivedResponse = {};
+
+  let promise = new Promise(function(resolve, reject) {
+    function WaitForMessage(event) {
+      if (event.data.messageUuid != messageUuid)
+        return;
+      receivedResponse = event.data;
+      if (event.data.result === 'success') {
+        resolve();
+      } else {
+        reject(event.data.result);
+      }
+    }
+    window.addEventListener('message', WaitForMessage);
+    child_window.postMessage(
+        {messageUuid: messageUuid, script: script, param: param}, '*');
+  });
+  await promise;
+  return receivedResponse.returnValue;
+}
+
+// Creates an frame and navigates it to a URL on "origin", and waits for the URL
+// to finish loading by waiting for the frame to send an event. Then returns
+// the frame's Window object. Depending on the value of "is_iframe", the created
+// frame will either be a new iframe, or a new top-level main frame. In the iframe
+// case, its "allow" field will be set to "permissions".
+//
+// Also adds a cleanup callback to "test", which runs all cleanup functions
+// added within the frame and waits for them to complete, and then destroys the
+// iframe or closes the window.
+async function createFrame(test, origin, is_iframe = true, permissions = null) {
+  const frameUuid = generateUuid(test);
+  const frameUrl =
+      `${origin}${RESOURCE_PATH}subordinate-frame.sub.html?uuid=${frameUuid}`;
+  let promise = new Promise(function(resolve, reject) {
+    function WaitForMessage(event) {
+      if (event.data.messageUuid != frameUuid)
+        return;
+      if (event.data.result === 'load complete') {
+        resolve();
+      } else {
+        reject(event.data.result);
+      }
+    }
+    window.addEventListener('message', WaitForMessage);
+  });
+
+  if (is_iframe) {
+    let iframe = document.createElement('iframe');
+    if (permissions)
+      iframe.allow = permissions;
+    iframe.src = frameUrl;
+    document.body.appendChild(iframe);
+
+    test.add_cleanup(async () => {
+      await runInFrame(test, iframe.contentWindow, "await test_instance.do_cleanup();");
+      document.body.removeChild(iframe);
+    });
+
+    await promise;
+    return iframe.contentWindow;
+  }
+
+  let child_window = window.open(frameUrl);
+  test.add_cleanup(async () => {
+    await runInFrame(test, child_window, "await test_instance.do_cleanup();");
+    child_window.close();
+  });
+
+  await promise;
+  return child_window;
+}
+
+// Wrapper around createFrame() that creates an iframe and optionally sets
+// permissions.
+async function createIframe(test, origin, permissions = null) {
+  return await createFrame(test, origin, /*is_iframe=*/true, permissions);
+}
+
+// Wrapper around createFrame() that creates a top-level window.
+async function createTopLevelWindow(test, origin) {
+  return await createFrame(test, origin, /*is_iframe=*/false);
+}
+
+// Joins a cross-origin interest group. Currently does this by joining the
+// interest group in an iframe, though it may switch to using a .well-known
+// fetch to allow the cross-origin join, when support for that is added
+// to these tests, so callers should not assume that's the mechanism in use.
+async function joinCrossOriginInterestGroup(test, uuid, origin, interestGroupOverrides = {}) {
+  let interestGroup = JSON.stringify(
+      createInterestGroupForOrigin(uuid, origin, interestGroupOverrides));
+
+  let iframe = await createIframe(test, origin, 'join-ad-interest-group');
+  await runInFrame(test, iframe,
+                   `await joinInterestGroup(test_instance, "${uuid}", ${interestGroup})`);
+}
+
+// Joins an interest group in a top-level window, which has the same origin
+// as the joined interest group.
+async function joinInterestGroupInTopLevelWindow(
+    test, uuid, origin, interestGroupOverrides = {}) {
+  let interestGroup = JSON.stringify(
+      createInterestGroupForOrigin(uuid, origin, interestGroupOverrides));
+
+  let topLeveWindow = await createTopLevelWindow(test, origin);
+  await runInFrame(test, topLeveWindow,
+                   `await joinInterestGroup(test_instance, "${uuid}", ${interestGroup})`);
+}
diff --git a/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html b/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
index 465f8e7bdf0..e696ac0983d 100644
--- a/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
+++ b/tests/wpt/tests/fledge/tentative/resources/subordinate-frame.sub.html
@@ -1,11 +1,11 @@
 <!DOCTYPE html>
 <html>
 <head>
-<!--- Allow injected scripts to use functions in fledge-util.js --->
+<!--- Allow injected scripts to use functions in fledge-util.sub.js --->
 <base href="..">
 <script src="/resources/testharness.js"></script>
 <script src="/common/utils.js"></script>
-<script src="resources/fledge-util.js"></script>
+<script src="resources/fledge-util.sub.js"></script>
 </head>
 <body>
 <script>
diff --git a/tests/wpt/tests/fledge/tentative/round-a-value.https.sub.window.js b/tests/wpt/tests/fledge/tentative/round-a-value.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/round-a-value.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/round-a-value.https.window.js
index 3eb0f5f359d..5bccd4ab078 100644
--- a/tests/wpt/tests/fledge/tentative/round-a-value.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/round-a-value.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: timeout=long
 
 "use strict;"
diff --git a/tests/wpt/tests/fledge/tentative/send-report-to.https.sub.window.js b/tests/wpt/tests/fledge/tentative/send-report-to.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/send-report-to.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/send-report-to.https.window.js
index e97545985c4..65a25204206 100644
--- a/tests/wpt/tests/fledge/tentative/send-report-to.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/send-report-to.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fledge/tentative/tie.https.window.js b/tests/wpt/tests/fledge/tentative/tie.https.window.js
new file mode 100644
index 00000000000..48d6e95e5c4
--- /dev/null
+++ b/tests/wpt/tests/fledge/tentative/tie.https.window.js
@@ -0,0 +1,125 @@
+// META: script=/resources/testdriver.js
+// META: script=/common/utils.js
+// META: script=resources/fledge-util.sub.js
+// META: timeout=long
+
+"use strict;"
+
+// Runs one auction at a time using `auctionConfigOverrides` until the auction
+// has a winner.
+async function runAuctionsUntilWinner(test, uuid, auctionConfigOverrides) {
+  fencedFrameConfig = null;
+  while (!fencedFrameConfig) {
+    fencedFrameConfig =
+        await runBasicFledgeAuction(test, uuid, auctionConfigOverrides);
+  }
+  return fencedFrameConfig;
+}
+
+// This tests the case of ties. The winner of an auction is normally checked
+// by these tests by checking a report sent when the winner is loaded in a fenced
+// frame. Unfortunately, that requires a lot of navigations, which can be slow.
+//
+// So instead, run a multi-seller auction. The inner auction has two bidders,
+// which both bid, and the seller gives them the same score. For the first
+// auction, the top-level seller just accepts the only bid it sees, and then
+// as usual, we navigate a fenced frame, to learn which bidder won.
+//
+// The for subsequent auctions, the nested component auction is identical,
+// but the top-level auction rejects bids from the bidder that won the
+// first auction. So if we have a winner, we know that the other bidder
+// won the tie. Auctions are run in parallel until this happens.
+//
+// The interest groups use "group-by-origin" execution mode, to potentially
+// allow the auctions run in parallel to complete faster.
+promise_test(async test => {
+  const uuid = generateUuid(test);
+
+  // Use different report URLs for each interest group, to identify
+  // which interest group has won an auction.
+  let reportURLs = [createBidderReportURL(uuid, /*id=*/'1'),
+                    createBidderReportURL(uuid, /*id=*/'2')];
+
+  // Use different ad URLs for each auction. These need to be distinct
+  // so that the top-level seller can check the URL to check if the
+  // winning bid from the component auction has already won an
+  // auction.
+  let adURLs = [createRenderURL(uuid),
+                createRenderURL(uuid, /*script=*/';')];
+
+  await Promise.all(
+      [ joinInterestGroup(
+          test, uuid,
+          { name: 'group 1',
+            ads: [{ renderURL: adURLs[0] }],
+            executionMode: 'group-by-origin',
+            biddingLogicURL: createBiddingScriptURL(
+                { allowComponentAuction: true,
+                  reportWin: `sendReportTo("${reportURLs[0]}");`})}),
+        joinInterestGroup(
+          test, uuid,
+          { name: 'group 2',
+            ads: [{ renderURL: adURLs[1] }],
+            executionMode: 'group-by-origin',
+            biddingLogicURL: createBiddingScriptURL(
+                { allowComponentAuction: true,
+                  reportWin: `sendReportTo("${reportURLs[1]}");`})})
+      ]
+  );
+
+  let componentAuctionConfig = {
+      seller: window.location.origin,
+      decisionLogicURL: createDecisionScriptURL(uuid),
+      interestGroupBuyers: [window.location.origin]
+  };
+
+  let auctionConfigOverrides = {
+    decisionLogicURL: createDecisionScriptURL(uuid),
+    interestGroupBuyers: [],
+    componentAuctions: [componentAuctionConfig]
+  };
+
+  await runBasicFledgeAuctionAndNavigate(test, uuid, auctionConfigOverrides);
+
+  // Waiting for the report URL of the winner should succeed, while waiting for
+  // the one of the loser should throw. Wait for both, see which succeeds, and
+  // set "winningAdURL" to the ad URL of the winner.
+  let winningAdURL = '';
+  try {
+    await waitForObservedRequests(uuid, [reportURLs[0]]);
+    winningAdURL = adURLs[0];
+  } catch (e) {
+    await waitForObservedRequests(uuid, [reportURLs[1]]);
+    winningAdURL = adURLs[1];
+  }
+
+  // Modify `auctionConfigOverrides` to only accept the ad from the interest
+  // group that didn't win the first auction.
+  auctionConfigOverrides.decisionLogicURL =
+      createDecisionScriptURL(
+        uuid,
+        {scoreAd: `if (browserSignals.renderURL == "${winningAdURL}")
+                     return 0;`});
+
+  // Add an abort controller, so can cancel extra auctions.
+  let abortController = new AbortController();
+  auctionConfigOverrides.signal = abortController.signal;
+
+  // Run a bunch of auctions in parallel, until one has a winner.
+  let fencedFrameConfig = await Promise.any(
+    [ runAuctionsUntilWinner(test, uuid, auctionConfigOverrides),
+      runAuctionsUntilWinner(test, uuid, auctionConfigOverrides),
+      runAuctionsUntilWinner(test, uuid, auctionConfigOverrides),
+      runAuctionsUntilWinner(test, uuid, auctionConfigOverrides),
+      runAuctionsUntilWinner(test, uuid, auctionConfigOverrides),
+      runAuctionsUntilWinner(test, uuid, auctionConfigOverrides)
+    ]
+  );
+  // Abort the other auctions.
+  abortController.abort('reason');
+
+  // Load the fencedFrameConfig in a fenced frame, and double-check that each
+  // interest group has won once.
+  createAndNavigateFencedFrame(test, fencedFrameConfig);
+  await waitForObservedRequests(uuid, [reportURLs[0], reportURLs[1]]);
+}, 'runAdAuction tie.');
diff --git a/tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.sub.window.js b/tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.window.js
index f2201456a12..8c15e93e66d 100644
--- a/tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/trusted-bidding-signals.https.window.js
@@ -1,7 +1,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
 // META: script=/common/subset-tests.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: timeout=long
 // META: variant=?1-5
 // META: variant=?6-10
diff --git a/tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.sub.window.js b/tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.window.js
similarity index 99%
rename from tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.sub.window.js
rename to tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.window.js
index 422994b8202..67ae3577e4f 100644
--- a/tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.sub.window.js
+++ b/tests/wpt/tests/fledge/tentative/trusted-scoring-signals.https.window.js
@@ -1,6 +1,6 @@
 // META: script=/resources/testdriver.js
 // META: script=/common/utils.js
-// META: script=resources/fledge-util.js
+// META: script=resources/fledge-util.sub.js
 // META: script=/common/subset-tests.js
 // META: timeout=long
 // META: variant=?1-5
diff --git a/tests/wpt/tests/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf b/tests/wpt/tests/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-chws.otf
index 18859d5e2fe1200da5caef5f88d15864d0477963..8aa4c66254cf0e4595a51a083af347e357f4c991 100644
GIT binary patch
delta 22930
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diff --git a/tests/wpt/tests/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf b/tests/wpt/tests/fonts/noto/cjk/NotoSansCJKjp-Regular-subset-halt.otf
index 773282263e6e0fe11c4b319ee156f403d824bc5e..a87f8985966b80e8bef6160b119d0eb010ec544e 100644
GIT binary patch
delta 22535
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diff --git a/tests/wpt/tests/fonts/noto/cjk/README.md b/tests/wpt/tests/fonts/noto/cjk/README.md
index 8ff42d0f441..a14fa64b42a 100644
--- a/tests/wpt/tests/fonts/noto/cjk/README.md
+++ b/tests/wpt/tests/fonts/noto/cjk/README.md
@@ -8,7 +8,7 @@ This font is generated by the following command:
 ```
 pyftsubset NotoSansCJKjp-Regular.otf \
   --unicodes=20-7E,2018-201F,56FD,6C34,3000-301F,30FB,FF01-FF1F,FF5B-FF65 \
-  --layout-features+=halt,vhal \
+  --layout-features+=halt,fwid,hwid,palt,pwid,vhal,vpal \
   --output-file=NotoSansCJKjp-Regular-subset-halt.otf
 ```
 where `pyftsubset` comes from https://github.com/fonttools/fonttools
@@ -21,7 +21,7 @@ This font is generated by the following command:
 ```
 pyftsubset NotoSansCJKjp-Regular.otf \
   --unicodes=20-7E,2018-201F,56FD,6C34,3000-301F,30FB,FF01-FF1F,FF5B-FF65 \
-  --layout-features+=halt,vhal,chws,vchw \
+  --layout-features+=halt,fwid,hwid,palt,pwid,vhal,vpal,chws,vchw \
   --output-file=NotoSansCJKjp-Regular-subset-chws.otf
 ```
 Note there are two variants of Noto CJK; one with `chws` and one without.
diff --git a/tests/wpt/tests/html-aam/fragile/area-role.html b/tests/wpt/tests/html-aam/fragile/area-role.html
index 9b6ded56860..3ed17f8b3b8 100644
--- a/tests/wpt/tests/html-aam/fragile/area-role.html
+++ b/tests/wpt/tests/html-aam/fragile/area-role.html
@@ -13,12 +13,13 @@
 
 <map name="areamap">
     <area shape="rect" coords="0,0,15,15" href="#" alt="x" data-testname="el-area" data-expectedrole="link" class="ex">
-    <area shape="rect" coords="15,15,31,31" alt="x" data-testname="el-area-no-href" data-expectedrole="generic" class="ex">
+    <area shape="rect" coords="15,15,31,31" alt="x" data-testname="el-area-no-href" class="ex-generic">
 </map>
 <img usemap="#areamap" src="#" style="width: 32px; height: 32px;" alt="x">
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/html-aam/roles.html b/tests/wpt/tests/html-aam/roles.html
index 4b24743c8d5..2ffda4d4845 100644
--- a/tests/wpt/tests/html-aam/roles.html
+++ b/tests/wpt/tests/html-aam/roles.html
@@ -88,8 +88,8 @@
 <img src="#" alt="x" data-testname="el-img" data-expectedrole="image" class="ex">
 
 <!-- Implementations might also be valid if ignored rather than returning 'none' for the following images. -->
-<img src="#" alt data-testname="el-img-alt-no-value" data-expectedrole="none" class="ex">
-<img src="#" alt="" data-testname="el-img-empty-alt" data-expectedrole="none" class="ex">
+<img src="#" alt data-testname="el-img-alt-no-value" class="ex-generic">
+<img src="#" alt="" data-testname="el-img-empty-alt" class="ex-generic">
 
 <input type="button" value="x" data-testname="el-input-button" data-expectedrole="button" class="ex">
 <input type="checkbox" data-testname="el-input-checkbox" data-expectedrole="checkbox" class="ex">
@@ -199,6 +199,7 @@
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/html-aam/table-roles.html b/tests/wpt/tests/html-aam/table-roles.html
index 3f1a4eccd66..a81caa3d3f0 100644
--- a/tests/wpt/tests/html-aam/table-roles.html
+++ b/tests/wpt/tests/html-aam/table-roles.html
@@ -13,6 +13,8 @@
 
 <p>Tests the computedrole mappings for the table-related roles defined in <a href="https://w3c.github.io/html-aam/">HTML-AAM</a>. Most test names correspond to unique ID defined in the spec.<p>
 
+<!-- ARIA table roles tested in wpt/wai-aria/role/table-roles.html -->
+
 <table data-testname="el-table" data-expectedrole="table" class="ex">
   <caption data-testname="el-caption" data-expectedrole="caption" class="ex">caption</caption>
   <thead data-testname="el-thead" data-expectedrole="rowgroup" class="ex">
diff --git a/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html
new file mode 100644
index 00000000000..191395a20b0
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.currentcolor.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.fillStyle.colormix.currentcolor</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.fillStyle.colormix.currentcolor</h1>
+<p class="desc">color-mix works as color input with currentcolor</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("color-mix works as color input with currentcolor");
+_addTest(function(canvas, ctx) {
+
+  canvas.setAttribute('style', 'color: magenta');
+  ctx.fillStyle = "color-mix(in srgb, black, currentcolor)";
+  _assertSame(ctx.fillStyle, 'color(srgb 0.5 0 0.5)', "ctx.fillStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.strokeStyle = "color-mix(in srgb, black, currentcolor)";
+  _assertSame(ctx.strokeStyle, 'color(srgb 0.5 0 0.5)', "ctx.strokeStyle", "'color(srgb 0.5 0 0.5)'");
+
+});
+</script>
+
diff --git a/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html
new file mode 100644
index 00000000000..1faa6c0a9f2
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.fillStyle.colormix.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.fillStyle.colormix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.fillStyle.colormix</h1>
+<p class="desc">color-mix works as color input</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("color-mix works as color input");
+_addTest(function(canvas, ctx) {
+
+  ctx.fillStyle = "color-mix(in srgb, red, blue)";
+  _assertSame(ctx.fillStyle, 'color(srgb 0.5 0 0.5)', "ctx.fillStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.fillStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+  _assertSame(ctx.fillStyle, 'color(srgb 1 0 0)', "ctx.fillStyle", "'color(srgb 1 0 0)'");
+
+});
+</script>
+
diff --git a/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html
new file mode 100644
index 00000000000..c1971666e89
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/fill-and-stroke-styles/2d.strokeStyle.colormix.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.strokeStyle.colormix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.strokeStyle.colormix</h1>
+<p class="desc">color-mix works as color input</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("color-mix works as color input");
+_addTest(function(canvas, ctx) {
+
+  ctx.strokeStyle = "color-mix(in srgb, red, blue)";
+  _assertSame(ctx.strokeStyle, 'color(srgb 0.5 0 0.5)', "ctx.strokeStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.strokeStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+  _assertSame(ctx.strokeStyle, 'color(srgb 1 0 0)', "ctx.strokeStyle", "'color(srgb 1 0 0)'");
+
+});
+</script>
+
diff --git a/tests/wpt/tests/html/canvas/element/filters/svg-filter-crash.html b/tests/wpt/tests/html/canvas/element/filters/svg-filter-crash.html
new file mode 100644
index 00000000000..f64379c7924
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/filters/svg-filter-crash.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<script>
+  document.addEventListener('DOMContentLoaded', async () => {
+    const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+    const filter = document.createElementNS('http://www.w3.org/2000/svg', 'filter')
+    filter.setAttribute('id', 'id_0')
+    svg.appendChild(filter)
+    document.documentElement.appendChild(svg)
+    const canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas')
+    const context = canvas.getContext('2d')
+    context.filter = 'url(#id_0) url(#id_0) sepia() url(#id_0)'
+    svg.setAttribute('style', 'display: inline-block;')
+  })
+</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.putImageData.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.putImageData.html
new file mode 100644
index 00000000000..1e4d3331d8f
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/element/layers/2d.layer.putImageData.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.layer.putImageData</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.layer.putImageData</h1>
+<p class="desc">Check that calling putImageData in a layer throws an exception.</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("Check that calling putImageData in a layer throws an exception.");
+_addTest(function(canvas, ctx) {
+
+  const canvas2 = new OffscreenCanvas(100, 50);
+  const ctx2 = canvas2.getContext('2d')
+  const data = ctx2.getImageData(0, 0, 1, 1);
+  // `putImageData` shouldn't throw on it's own.
+  ctx.putImageData(data, 0, 0);
+  // Make sure the exception isn't caused by calling the function twice.
+  ctx.putImageData(data, 0, 0);
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError", () => ctx.putImageData(data, 0, 0));
+
+});
+</script>
+
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData-expected.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData-expected.html
deleted file mode 100644
index c73da157b12..00000000000
--- a/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData-expected.html
+++ /dev/null
@@ -1,32 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.layer.render-opportunities.putImageData</title>
-<h1>2d.layer.render-opportunities.putImageData</h1>
-<p class="desc">Check that layers state stack is flushed and rebuilt on frame renders.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-  ctx.endLayer();
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData.html b/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData.html
deleted file mode 100644
index 6a1215dd604..00000000000
--- a/tests/wpt/tests/html/canvas/element/layers/2d.layer.render-opportunities.putImageData.html
+++ /dev/null
@@ -1,34 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.layer.render-opportunities.putImageData-expected.html">
-<title>Canvas test: 2d.layer.render-opportunities.putImageData</title>
-<h1>2d.layer.render-opportunities.putImageData</h1>
-<p class="desc">Check that layers state stack is flushed and rebuilt on frame renders.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-
-  // Force a flush and restoration of the state stack:
-  const canvas2 = new OffscreenCanvas(200, 200);
-  const ctx2 = canvas2.getContext('2d');
-  ctx.putImageData(ctx2.getImageData(0, 0, 1, 1), 0, 0);
-
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-</script>
diff --git a/tests/wpt/tests/html/canvas/element/manual/imagebitmap/canvas-createImageBitmap-video-resize.html b/tests/wpt/tests/html/canvas/element/manual/imagebitmap/canvas-createImageBitmap-video-resize.html
index c7555405a83..d48d9e80ca9 100644
--- a/tests/wpt/tests/html/canvas/element/manual/imagebitmap/canvas-createImageBitmap-video-resize.html
+++ b/tests/wpt/tests/html/canvas/element/manual/imagebitmap/canvas-createImageBitmap-video-resize.html
@@ -1,6 +1,7 @@
 <!DOCTYPE HTML>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/common/media.js"></script>
 <script>
 function createNewCanvas(width, height)
 {
@@ -57,5 +58,5 @@ if (video.requestVideoFrameCallback) {
 } else {
     video.oncanplaythrough = t.step_func(() => generateTest());
 }
-video.src = '/media/counting.' + (video.canPlayType('video/ogg') ? 'ogv' : 'mp4');
+video.src = getVideoURI("/media/counting");
 </script>
diff --git a/tests/wpt/tests/html/canvas/element/manual/wide-gamut-canvas/resources/pattern-srgb-fullcolor.ogv b/tests/wpt/tests/html/canvas/element/manual/wide-gamut-canvas/resources/pattern-srgb-fullcolor.ogv
deleted file mode 100644
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diff --git a/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html
new file mode 100644
index 00000000000..059c551e466
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.fillStyle.colormix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.fillStyle.colormix</h1>
+<p class="desc">color-mix works as color input</p>
+
+
+<script>
+var t = async_test("color-mix works as color input");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = "color-mix(in srgb, red, blue)";
+  _assertSame(ctx.fillStyle, 'color(srgb 0.5 0 0.5)', "ctx.fillStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.fillStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+  _assertSame(ctx.fillStyle, 'color(srgb 1 0 0)', "ctx.fillStyle", "'color(srgb 1 0 0)'");
+  t.done();
+
+});
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js
new file mode 100644
index 00000000000..d015790ead7
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.colormix.worker.js
@@ -0,0 +1,25 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.fillStyle.colormix
+// Description:color-mix works as color input
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("color-mix works as color input");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = "color-mix(in srgb, red, blue)";
+  _assertSame(ctx.fillStyle, 'color(srgb 0.5 0 0.5)', "ctx.fillStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.fillStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+  _assertSame(ctx.fillStyle, 'color(srgb 1 0 0)', "ctx.fillStyle", "'color(srgb 1 0 0)'");
+  t.done();
+});
+done();
diff --git a/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html
new file mode 100644
index 00000000000..eba026619a8
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/fill-and-stroke-styles/2d.strokeStyle.colormix.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.strokeStyle.colormix</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.strokeStyle.colormix</h1>
+<p class="desc">color-mix works as color input</p>
+
+
+<script>
+var t = async_test("color-mix works as color input");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  ctx.strokeStyle = "color-mix(in srgb, red, blue)";
+  _assertSame(ctx.strokeStyle, 'color(srgb 0.5 0 0.5)', "ctx.strokeStyle", "'color(srgb 0.5 0 0.5)'");
+  ctx.strokeStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+  _assertSame(ctx.strokeStyle, 'color(srgb 1 0 0)', "ctx.strokeStyle", "'color(srgb 1 0 0)'");
+  t.done();
+
+});
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.html
new file mode 100644
index 00000000000..b46b80c1f46
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.layer.putImageData</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.layer.putImageData</h1>
+<p class="desc">Check that calling putImageData in a layer throws an exception.</p>
+
+
+<script>
+var t = async_test("Check that calling putImageData in a layer throws an exception.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  const canvas2 = new OffscreenCanvas(100, 50);
+  const ctx2 = canvas2.getContext('2d')
+  const data = ctx2.getImageData(0, 0, 1, 1);
+  // `putImageData` shouldn't throw on it's own.
+  ctx.putImageData(data, 0, 0);
+  // Make sure the exception isn't caused by calling the function twice.
+  ctx.putImageData(data, 0, 0);
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError", () => ctx.putImageData(data, 0, 0));
+  t.done();
+
+});
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js
new file mode 100644
index 00000000000..dd4b3576f66
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.putImageData.worker.js
@@ -0,0 +1,31 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.layer.putImageData
+// Description:Check that calling putImageData in a layer throws an exception.
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Check that calling putImageData in a layer throws an exception.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  const canvas2 = new OffscreenCanvas(100, 50);
+  const ctx2 = canvas2.getContext('2d')
+  const data = ctx2.getImageData(0, 0, 1, 1);
+  // `putImageData` shouldn't throw on it's own.
+  ctx.putImageData(data, 0, 0);
+  // Make sure the exception isn't caused by calling the function twice.
+  ctx.putImageData(data, 0, 0);
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError", () => ctx.putImageData(data, 0, 0));
+  t.done();
+});
+done();
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData-expected.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData-expected.html
deleted file mode 100644
index c73da157b12..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData-expected.html
+++ /dev/null
@@ -1,32 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.layer.render-opportunities.putImageData</title>
-<h1>2d.layer.render-opportunities.putImageData</h1>
-<p class="desc">Check that layers state stack is flushed and rebuilt on frame renders.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-  ctx.endLayer();
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html
deleted file mode 100644
index 2caf797db75..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.html
+++ /dev/null
@@ -1,37 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.layer.render-opportunities.putImageData-expected.html">
-<title>Canvas test: 2d.layer.render-opportunities.putImageData</title>
-<h1>2d.layer.render-opportunities.putImageData</h1>
-<p class="desc">Check that layers state stack is flushed and rebuilt on frame renders.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(200, 200);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-
-  // Force a flush and restoration of the state stack:
-  const canvas2 = new OffscreenCanvas(200, 200);
-  const ctx2 = canvas2.getContext('2d');
-  ctx.putImageData(ctx2.getImageData(0, 0, 1, 1), 0, 0);
-
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html
deleted file mode 100644
index be9b4fd454d..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.putImageData.w.html
+++ /dev/null
@@ -1,51 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.layer.render-opportunities.putImageData-expected.html">
-<title>Canvas test: 2d.layer.render-opportunities.putImageData</title>
-<h1>2d.layer.render-opportunities.putImageData</h1>
-<p class="desc">Check that layers state stack is flushed and rebuilt on frame renders.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(200, 200);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'purple';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
-
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillRect(40, 40, 75, 50);
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(50, 50, 75, 50);
-
-    // Force a flush and restoration of the state stack:
-    const canvas2 = new OffscreenCanvas(200, 200);
-    const ctx2 = canvas2.getContext('2d');
-    ctx.putImageData(ctx2.getImageData(0, 0, 1, 1), 0, 0);
-
-    ctx.fillRect(70, 70, 75, 50);
-    ctx.fillStyle = 'orange';
-    ctx.fillRect(80, 80, 75, 50);
-    ctx.endLayer();
-
-    ctx.fillRect(80, 40, 75, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap-expected.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap-expected.html
deleted file mode 100644
index 36deca50f4a..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap-expected.html
+++ /dev/null
@@ -1,24 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<title>Canvas test: 2d.layer.render-opportunities.transferToImageBitmap</title>
-<h1>2d.layer.render-opportunities.transferToImageBitmap</h1>
-<p class="desc">Checks that transferToImageBitmap flushes and rebuilds the state stack.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = document.getElementById("canvas");
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.html
deleted file mode 100644
index 634d9e3a78c..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.html
+++ /dev/null
@@ -1,36 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<link rel="match" href="2d.layer.render-opportunities.transferToImageBitmap-expected.html">
-<title>Canvas test: 2d.layer.render-opportunities.transferToImageBitmap</title>
-<h1>2d.layer.render-opportunities.transferToImageBitmap</h1>
-<p class="desc">Checks that transferToImageBitmap flushes and rebuilds the state stack.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script>
-  const canvas = new OffscreenCanvas(200, 200);
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = 'purple';
-  ctx.fillRect(60, 60, 75, 50);
-  ctx.globalAlpha = 0.5;
-
-  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-  ctx.fillRect(40, 40, 75, 50);
-  ctx.fillStyle = 'grey';
-  ctx.fillRect(50, 50, 75, 50);
-
-  // Force a flush and restoration of the state stack.
-  // `transferToImageBitmap` clears the frame but preserves render states.
-  canvas.transferToImageBitmap();
-
-  ctx.fillRect(70, 70, 75, 50);
-  ctx.fillStyle = 'orange';
-  ctx.fillRect(80, 80, 75, 50);
-  ctx.endLayer();
-
-  ctx.fillRect(80, 40, 75, 50);
-
-  const outputCanvas = document.getElementById("canvas");
-  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
-</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html
deleted file mode 100644
index 823bfac58b0..00000000000
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.render-opportunities.transferToImageBitmap.w.html
+++ /dev/null
@@ -1,50 +0,0 @@
-<!DOCTYPE html>
-<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
-<html class="reftest-wait">
-<link rel="match" href="2d.layer.render-opportunities.transferToImageBitmap-expected.html">
-<title>Canvas test: 2d.layer.render-opportunities.transferToImageBitmap</title>
-<h1>2d.layer.render-opportunities.transferToImageBitmap</h1>
-<p class="desc">Checks that transferToImageBitmap flushes and rebuilds the state stack.</p>
-<canvas id="canvas" width="200" height="200">
-  <p class="fallback">FAIL (fallback content)</p>
-</canvas>
-<script id='myWorker' type='text/worker'>
-  self.onmessage = function(e) {
-    const canvas = new OffscreenCanvas(200, 200);
-    const ctx = canvas.getContext('2d');
-
-    ctx.fillStyle = 'purple';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
-
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillRect(40, 40, 75, 50);
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(50, 50, 75, 50);
-
-    // Force a flush and restoration of the state stack.
-    // `transferToImageBitmap` clears the frame but preserves render states.
-    canvas.transferToImageBitmap();
-
-    ctx.fillRect(70, 70, 75, 50);
-    ctx.fillStyle = 'orange';
-    ctx.fillRect(80, 80, 75, 50);
-    ctx.endLayer();
-
-    ctx.fillRect(80, 40, 75, 50);
-
-    const bitmap = canvas.transferToImageBitmap();
-    self.postMessage(bitmap, bitmap);
-  };
-</script>
-<script>
-  const blob = new Blob([document.getElementById('myWorker').textContent]);
-  const worker = new Worker(URL.createObjectURL(blob));
-  worker.addEventListener('message', msg => {
-    const outputCtx = document.getElementById("canvas").getContext('2d');
-    outputCtx.drawImage(msg.data, 0, 0);
-    document.documentElement.classList.remove("reftest-wait");
-  });
-  worker.postMessage(null);
-</script>
-</html>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html
new file mode 100644
index 00000000000..5e5d6d16c6b
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.layer.transferToImageBitmap</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.layer.transferToImageBitmap</h1>
+<p class="desc">Check that calling transferToImageBitmap in a layer throws an exception.</p>
+
+
+<script>
+var t = async_test("Check that calling transferToImageBitmap in a layer throws an exception.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  // `transferToImageBitmap` shouldn't throw on it's own.
+  canvas.transferToImageBitmap();
+  // Make sure the exception isn't caused by calling the function twice.
+  canvas.transferToImageBitmap();
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError",
+                    () => canvas.transferToImageBitmap());
+  t.done();
+
+});
+</script>
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js
new file mode 100644
index 00000000000..073a3e84a48
--- /dev/null
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.transferToImageBitmap.worker.js
@@ -0,0 +1,29 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.layer.transferToImageBitmap
+// Description:Check that calling transferToImageBitmap in a layer throws an exception.
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Check that calling transferToImageBitmap in a layer throws an exception.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  // `transferToImageBitmap` shouldn't throw on it's own.
+  canvas.transferToImageBitmap();
+  // Make sure the exception isn't caused by calling the function twice.
+  canvas.transferToImageBitmap();
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError",
+                    () => canvas.transferToImageBitmap());
+  t.done();
+});
+done();
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed-nested.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed-nested.w.html
index dd1c36ea471..e330e1710cf 100644
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed-nested.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed-nested.w.html
@@ -13,20 +13,29 @@
     const canvas = new OffscreenCanvas(200, 200);
     const ctx = canvas.getContext('2d');
 
-    ctx.fillStyle = 'rgba(0, 0, 255, 1)';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
+    // `transferToImageBitmap` is used to transfer the test result to the
+    // worker's parent, but `transferToImageBitmap` can't be called on canvas
+    // with unclosed layers. We can however draw to a separate offscreen canvas
+    // and write it to the main canvas using `drawImage`.
+    const canvas2 = new OffscreenCanvas(200, 200);
+    const ctx2 = canvas2.getContext('2d');
 
-    ctx.beginLayer();
-    ctx.fillStyle = 'rgba(225, 0, 0, 1)';
-    ctx.fillRect(50, 50, 75, 50);
+    ctx2.fillStyle = 'rgba(0, 0, 255, 1)';
+    ctx2.fillRect(60, 60, 75, 50);
+    ctx2.globalAlpha = 0.5;
 
-    ctx.beginLayer();
-    ctx.fillStyle = 'rgba(0, 255, 0, 1)';
-    ctx.fillRect(70, 70, 75, 50);
+    ctx2.beginLayer();
+    ctx2.fillStyle = 'rgba(225, 0, 0, 1)';
+    ctx2.fillRect(50, 50, 75, 50);
 
-    ctx.endLayer();
-    // Missing ctx.endLayer() here.
+    ctx2.beginLayer();
+    ctx2.fillStyle = 'rgba(0, 255, 0, 1)';
+    ctx2.fillRect(70, 70, 75, 50);
+
+    ctx2.endLayer();
+    // Missing ctx2.endLayer() here.
+
+    ctx.drawImage(canvas2, 0, 0);
 
     const bitmap = canvas.transferToImageBitmap();
     self.postMessage(bitmap, bitmap);
diff --git a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed.w.html b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed.w.html
index 830dea7e3d1..1da44c26c86 100644
--- a/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed.w.html
+++ b/tests/wpt/tests/html/canvas/offscreen/layers/2d.layer.unclosed.w.html
@@ -13,14 +13,23 @@
     const canvas = new OffscreenCanvas(200, 200);
     const ctx = canvas.getContext('2d');
 
-    ctx.fillStyle = 'purple';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
+    // `transferToImageBitmap` is used to transfer the test result to the
+    // worker's parent, but `transferToImageBitmap` can't be called on canvas
+    // with unclosed layers. We can however draw to a separate offscreen canvas
+    // and write it to the main canvas using `drawImage`.
+    const canvas2 = new OffscreenCanvas(200, 200);
+    const ctx2 = canvas2.getContext('2d');
 
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillRect(40, 40, 75, 50);
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(50, 50, 75, 50);
+    ctx2.fillStyle = 'purple';
+    ctx2.fillRect(60, 60, 75, 50);
+    ctx2.globalAlpha = 0.5;
+
+    ctx2.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
+    ctx2.fillRect(40, 40, 75, 50);
+    ctx2.fillStyle = 'grey';
+    ctx2.fillRect(50, 50, 75, 50);
+
+    ctx.drawImage(canvas2, 0, 0);
 
     const bitmap = canvas.transferToImageBitmap();
     self.postMessage(bitmap, bitmap);
diff --git a/tests/wpt/tests/html/canvas/tools/yaml-new/fill-and-stroke-styles.yaml b/tests/wpt/tests/html/canvas/tools/yaml-new/fill-and-stroke-styles.yaml
index 19157d962b4..c992af6e7c1 100644
--- a/tests/wpt/tests/html/canvas/tools/yaml-new/fill-and-stroke-styles.yaml
+++ b/tests/wpt/tests/html/canvas/tools/yaml-new/fill-and-stroke-styles.yaml
@@ -2074,3 +2074,31 @@
     ctx.fillStyle = color;
     ctx.fillRect(0, 0, 100, 50);
   expected: green
+
+- name: 2d.fillStyle.colormix
+  desc: color-mix works as color input
+  canvasType: ['HtmlCanvas', 'OffscreenCanvas', 'Worker']
+  code: |
+    ctx.fillStyle = "color-mix(in srgb, red, blue)";
+    @assert ctx.fillStyle === 'color(srgb 0.5 0 0.5)';
+    ctx.fillStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+    @assert ctx.fillStyle === 'color(srgb 1 0 0)';
+
+- name: 2d.fillStyle.colormix.currentcolor
+  desc: color-mix works as color input with currentcolor
+  canvasType: ['HtmlCanvas']
+  code: |
+    canvas.setAttribute('style', 'color: magenta');
+    ctx.fillStyle = "color-mix(in srgb, black, currentcolor)";
+    @assert ctx.fillStyle === 'color(srgb 0.5 0 0.5)';
+    ctx.strokeStyle = "color-mix(in srgb, black, currentcolor)";
+    @assert ctx.strokeStyle === 'color(srgb 0.5 0 0.5)';
+
+- name: 2d.strokeStyle.colormix
+  desc: color-mix works as color input
+  canvasType: ['HtmlCanvas', 'OffscreenCanvas']
+  code: |
+    ctx.strokeStyle = "color-mix(in srgb, red, blue)";
+    @assert ctx.strokeStyle === 'color(srgb 0.5 0 0.5)';
+    ctx.strokeStyle = "color-mix(in srgb, red, color(srgb 1 0 0))";
+    @assert ctx.strokeStyle === 'color(srgb 1 0 0)';
diff --git a/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml b/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
index 9145108bd3c..56cd0331f29 100644
--- a/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
+++ b/tests/wpt/tests/html/canvas/tools/yaml-new/layers.yaml
@@ -312,14 +312,29 @@
   desc: Check that layers are rendered even if not closed.
   size: [200, 200]
   code: |
-    ctx.fillStyle = 'purple';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
+    {% set ns = namespace(ctx='ctx') %}
+    {% if canvas_type == 'worker' %}
+    // `transferToImageBitmap` is used to transfer the test result to the
+    // worker's parent, but `transferToImageBitmap` can't be called on canvas
+    // with unclosed layers. We can however draw to a separate offscreen canvas
+    // and write it to the main canvas using `drawImage`.
+    const canvas2 = new OffscreenCanvas({{ size[0] }}, {{ size[1] }});
+    const ctx2 = canvas2.getContext('2d');
+    {% set ns.ctx = 'ctx2' %}
+    {% endif %}
 
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillRect(40, 40, 75, 50);
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(50, 50, 75, 50);
+    {{ ns.ctx }}.fillStyle = 'purple';
+    {{ ns.ctx }}.fillRect(60, 60, 75, 50);
+    {{ ns.ctx }}.globalAlpha = 0.5;
+
+    {{ ns.ctx }}.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
+    {{ ns.ctx }}.fillRect(40, 40, 75, 50);
+    {{ ns.ctx }}.fillStyle = 'grey';
+    {{ ns.ctx }}.fillRect(50, 50, 75, 50);
+
+    {% if canvas_type == 'worker' %}
+    ctx.drawImage(canvas2, 0, 0);
+    {% endif %}
   reference: |
     ctx.fillStyle = 'purple';
     ctx.fillRect(60, 60, 75, 50);
@@ -336,20 +351,35 @@
   desc: Check that layers are rendered even if not closed.
   size: [200, 200]
   code: |
-    ctx.fillStyle = 'rgba(0, 0, 255, 1)';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
+    {% set ns = namespace(ctx='ctx') %}
+    {% if canvas_type == 'worker' %}
+    // `transferToImageBitmap` is used to transfer the test result to the
+    // worker's parent, but `transferToImageBitmap` can't be called on canvas
+    // with unclosed layers. We can however draw to a separate offscreen canvas
+    // and write it to the main canvas using `drawImage`.
+    const canvas2 = new OffscreenCanvas({{ size[0] }}, {{ size[1] }});
+    const ctx2 = canvas2.getContext('2d');
+    {% set ns.ctx = 'ctx2' %}
+    {% endif %}
 
-    ctx.beginLayer();
-    ctx.fillStyle = 'rgba(225, 0, 0, 1)';
-    ctx.fillRect(50, 50, 75, 50);
+    {{ ns.ctx }}.fillStyle = 'rgba(0, 0, 255, 1)';
+    {{ ns.ctx }}.fillRect(60, 60, 75, 50);
+    {{ ns.ctx }}.globalAlpha = 0.5;
 
-    ctx.beginLayer();
-    ctx.fillStyle = 'rgba(0, 255, 0, 1)';
-    ctx.fillRect(70, 70, 75, 50);
+    {{ ns.ctx }}.beginLayer();
+    {{ ns.ctx }}.fillStyle = 'rgba(225, 0, 0, 1)';
+    {{ ns.ctx }}.fillRect(50, 50, 75, 50);
 
-    ctx.endLayer();
-    // Missing ctx.endLayer() here.
+    {{ ns.ctx }}.beginLayer();
+    {{ ns.ctx }}.fillStyle = 'rgba(0, 255, 0, 1)';
+    {{ ns.ctx }}.fillRect(70, 70, 75, 50);
+
+    {{ ns.ctx }}.endLayer();
+    // Missing {{ ns.ctx }}.endLayer() here.
+
+    {% if canvas_type == 'worker' %}
+    ctx.drawImage(canvas2, 0, 0);
+    {% endif %}
   reference: |
     const canvas1 = document.createElement('canvas');
     const ctx1 = canvas1.getContext('2d');
@@ -429,11 +459,6 @@
       test_type: "promise"
       flush_canvas: |-
         await new Promise(resolve => requestAnimationFrame(resolve));
-    putImageData:
-      flush_canvas: |-
-        const canvas2 = new OffscreenCanvas({{ size[0] }}, {{ size[1] }});
-        const ctx2 = canvas2.getContext('2d');
-        ctx.putImageData(ctx2.getImageData(0, 0, 1, 1), 0, 0);
     toBlob:
       test_type: "promise"
       canvasType: ['HTMLCanvas']
@@ -443,44 +468,32 @@
       canvasType: ['HTMLCanvas']
       flush_canvas: canvas.toDataURL();
 
+- name: 2d.layer.putImageData
+  desc: Check that calling putImageData in a layer throws an exception.
+  code: |
+    const canvas2 = new OffscreenCanvas({{ size[0] }}, {{ size[1] }});
+    const ctx2 = canvas2.getContext('2d')
+    const data = ctx2.getImageData(0, 0, 1, 1);
+    // `putImageData` shouldn't throw on it's own.
+    ctx.putImageData(data, 0, 0);
+    // Make sure the exception isn't caused by calling the function twice.
+    ctx.putImageData(data, 0, 0);
+    // Calling again inside a layer should throw.
+    ctx.beginLayer();
+    assert_throws_dom("InvalidStateError", () => ctx.putImageData(data, 0, 0));
 
-- name: 2d.layer.render-opportunities.transferToImageBitmap
-  desc: Checks that transferToImageBitmap flushes and rebuilds the state stack.
-  size: [200, 200]
+- name: 2d.layer.transferToImageBitmap
+  desc: Check that calling transferToImageBitmap in a layer throws an exception.
   canvasType: ['OffscreenCanvas', 'Worker']
   code: |
-    ctx.fillStyle = 'purple';
-    ctx.fillRect(60, 60, 75, 50);
-    ctx.globalAlpha = 0.5;
-
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillRect(40, 40, 75, 50);
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(50, 50, 75, 50);
-
-    // Force a flush and restoration of the state stack.
-    // `transferToImageBitmap` clears the frame but preserves render states.
+    // `transferToImageBitmap` shouldn't throw on it's own.
     canvas.transferToImageBitmap();
-
-    ctx.fillRect(70, 70, 75, 50);
-    ctx.fillStyle = 'orange';
-    ctx.fillRect(80, 80, 75, 50);
-    ctx.endLayer();
-
-    ctx.fillRect(80, 40, 75, 50);
-  reference: |
-    ctx.fillStyle = 'purple';
-    ctx.globalAlpha = 0.5;
-
-    ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});
-    ctx.fillStyle = 'grey';
-    ctx.fillRect(70, 70, 75, 50);
-    ctx.fillStyle = 'orange';
-    ctx.fillRect(80, 80, 75, 50);
-    ctx.endLayer();
-
-    ctx.fillRect(80, 40, 75, 50);
-
+    // Make sure the exception isn't caused by calling the function twice.
+    canvas.transferToImageBitmap();
+    // Calling again inside a layer should throw.
+    ctx.beginLayer();
+    assert_throws_dom("InvalidStateError",
+                      () => canvas.transferToImageBitmap());
 
 - name: 2d.layer.several-complex
   desc: >-
diff --git a/tests/wpt/tests/html/dom/aria-attribute-reflection.html b/tests/wpt/tests/html/dom/aria-attribute-reflection.html
index afcee82eda1..e201d4660eb 100644
--- a/tests/wpt/tests/html/dom/aria-attribute-reflection.html
+++ b/tests/wpt/tests/html/dom/aria-attribute-reflection.html
@@ -6,6 +6,14 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
+<script>
+function testNullable(element, jsAttr, contentAttr) {
+    element[jsAttr] = null;
+    assert_equals(element[jsAttr], null);
+    assert_false(element.hasAttribute(contentAttr));
+}
+</script>
+
 <div id="role" role="button"></div>
 <script>
 test(function(t) {
@@ -13,6 +21,7 @@ test(function(t) {
     assert_equals(element.role, "button");
     element.role = "checkbox";
     assert_equals(element.getAttribute("role"), "checkbox");
+    testNullable(element, "role", "role");
 }, "role attribute reflects.");
 </script>
 
@@ -23,6 +32,7 @@ test(function(t) {
     assert_equals(element.ariaAtomic, "true");
     element.ariaAtomic = "false";
     assert_equals(element.getAttribute("aria-atomic"), "false");
+    testNullable(element, "ariaAtomic", "aria-atomic");
 }, "aria-atomic attribute reflects.");
 </script>
 
@@ -33,6 +43,7 @@ test(function(t) {
     assert_equals(element.ariaAutoComplete, "list");
     element.ariaAutoComplete = "inline";
     assert_equals(element.getAttribute("aria-autocomplete"), "inline");
+    testNullable(element, "ariaAutoComplete", "aria-autocomplete");
 }, "aria-autocomplete attribute reflects.");
 </script>
 
@@ -43,6 +54,7 @@ test(function(t) {
     assert_equals(element.ariaBusy, "true");
     element.ariaBusy = "false";
     assert_equals(element.getAttribute("aria-busy"), "false");
+    testNullable(element, "ariaBusy", "aria-busy");
 }, "aria-busy attribute reflects.");
 </script>
 
@@ -53,6 +65,7 @@ test(function(t) {
     assert_equals(element.ariaChecked, "mixed");
     element.ariaChecked = "true";
     assert_equals(element.getAttribute("aria-checked"), "true");
+    testNullable(element, "ariaChecked", "aria-checked");
 }, "aria-checked attribute reflects.");
 </script>
 
@@ -63,6 +76,7 @@ test(function(t) {
     assert_equals(element.ariaColCount, "5");
     element.ariaColCount = "6";
     assert_equals(element.getAttribute("aria-colcount"), "6");
+    testNullable(element, "ariaColCount", "aria-colcount");
 }, "aria-colcount attribute reflects.");
 </script>
 
@@ -73,6 +87,7 @@ test(function(t) {
     assert_equals(element.ariaColIndex, "1");
     element.ariaColIndex = "2";
     assert_equals(element.getAttribute("aria-colindex"), "2");
+    testNullable(element, "ariaColIndex", "aria-colindex");
 }, "aria-colindex attribute reflects.");
 </script>
 
@@ -83,6 +98,7 @@ test(function(t) {
     assert_equals(element.ariaColSpan, "2");
     element.ariaColSpan = "3";
     assert_equals(element.getAttribute("aria-colspan"), "3");
+    testNullable(element, "ariaColSpan", "aria-colspan");
 }, "aria-colspan attribute reflects.");
 </script>
 
@@ -93,6 +109,7 @@ test(function(t) {
     assert_equals(element.ariaCurrent, "page");
     element.ariaCurrent = "step";
     assert_equals(element.getAttribute("aria-current"), "step");
+    testNullable(element, "ariaCurrent", "aria-current");
 }, "aria-current attribute reflects.");
 </script>
 
@@ -105,6 +122,7 @@ test(function(t) {
     assert_equals(element.ariaDescription, "cold as ice");
     element.ariaDescription = "hot as fire";
     assert_equals(element.getAttribute("aria-description"), "hot as fire");
+    testNullable(element, "ariaDescription", "aria-description");
 }, "aria-description attribute reflects.");
 </script>
 
@@ -114,6 +132,7 @@ test(function(t) {
     assert_equals(element.ariaDisabled, "true");
     element.ariaDisabled = "false";
     assert_equals(element.getAttribute("aria-disabled"), "false");
+    testNullable(element, "ariaDisabled", "aria-disabled");
 }, "aria-disabled attribute reflects.");
 </script>
 
@@ -124,6 +143,7 @@ test(function(t) {
     assert_equals(element.ariaExpanded, "true");
     element.ariaExpanded = "false";
     assert_equals(element.getAttribute("aria-expanded"), "false");
+    testNullable(element, "ariaExpanded", "aria-expanded");
 }, "aria-expanded attribute reflects.");
 </script>
 
@@ -134,6 +154,7 @@ test(function(t) {
     assert_equals(element.ariaHasPopup, "menu");
     element.ariaHasPopup = "listbox";
     assert_equals(element.getAttribute("aria-haspopup"), "listbox");
+    testNullable(element, "ariaHasPopup", "aria-haspopup");
 }, "aria-haspopup attribute reflects.");
 </script>
 
@@ -144,6 +165,7 @@ test(function(t) {
     assert_equals(element.ariaHidden, "true");
     element.ariaHidden = "false";
     assert_equals(element.getAttribute("aria-hidden"), "false");
+    testNullable(element, "ariaHidden", "aria-hidden");
 }, "aria-hidden attribute reflects.");
 </script>
 
@@ -154,6 +176,7 @@ test(function(t) {
     assert_equals(element.ariaInvalid, "true");
     element.ariaInvalid = "grammar";
     assert_equals(element.getAttribute("aria-invalid"), "grammar");
+    testNullable(element, "ariaInvalid", "aria-invalid");
 }, "aria-invalid attribute reflects.");
 </script>
 
@@ -164,6 +187,7 @@ test(function(t) {
     assert_equals(element.ariaKeyShortcuts, "x");
     element.ariaKeyShortcuts = "y";
     assert_equals(element.getAttribute("aria-keyshortcuts"), "y");
+    testNullable(element, "ariaKeyShortcuts", "aria-keyshortcuts");
 }, "aria-keyshortcuts attribute reflects.");
 </script>
 
@@ -174,6 +198,7 @@ test(function(t) {
     assert_equals(element.ariaLabel, "x");
     element.ariaLabel = "y";
     assert_equals(element.getAttribute("aria-label"), "y");
+    testNullable(element, "ariaLabel", "aria-label");
 }, "aria-label attribute reflects.");
 </script>
 
@@ -184,6 +209,7 @@ test(function(t) {
     assert_equals(element.ariaLevel, "1");
     element.ariaLevel = "2";
     assert_equals(element.getAttribute("aria-level"), "2");
+    testNullable(element, "ariaLevel", "aria-level");
 }, "aria-level attribute reflects.");
 </script>
 
@@ -194,6 +220,7 @@ test(function(t) {
     assert_equals(element.ariaLive, "polite");
     element.ariaLive = "assertive";
     assert_equals(element.getAttribute("aria-live"), "assertive");
+    testNullable(element, "ariaLive", "aria-live");
 }, "aria-live attribute reflects.");
 </script>
 
@@ -204,6 +231,7 @@ test(function(t) {
     assert_equals(element.ariaModal, "true");
     element.ariaModal = "false";
     assert_equals(element.getAttribute("aria-modal"), "false");
+    testNullable(element, "ariaModal", "aria-modal");
 }, "aria-modal attribute reflects.");
 </script>
 
@@ -214,6 +242,7 @@ test(function(t) {
     assert_equals(element.ariaMultiLine, "true");
     element.ariaMultiLine = "false";
     assert_equals(element.getAttribute("aria-multiline"), "false");
+    testNullable(element, "ariaMultiLine", "aria-multiline");
 }, "aria-multiline attribute reflects.");
 </script>
 
@@ -224,6 +253,7 @@ test(function(t) {
     assert_equals(element.ariaMultiSelectable, "true");
     element.ariaMultiSelectable = "false";
     assert_equals(element.getAttribute("aria-multiselectable"), "false");
+    testNullable(element, "ariaMultiSelectable", "aria-multiselectable");
 }, "aria-multiselectable attribute reflects.");
 </script>
 
@@ -234,6 +264,7 @@ test(function(t) {
     assert_equals(element.ariaOrientation, "vertical");
     element.ariaOrientation = "horizontal";
     assert_equals(element.getAttribute("aria-orientation"), "horizontal");
+    testNullable(element, "ariaOrientation", "aria-orientation");
 }, "aria-orientation attribute reflects.");
 </script>
 
@@ -244,6 +275,7 @@ test(function(t) {
     assert_equals(element.ariaPlaceholder, "x");
     element.ariaPlaceholder = "y";
     assert_equals(element.getAttribute("aria-placeholder"), "y");
+    testNullable(element, "ariaPlaceholder", "aria-placeholder");
 }, "aria-placeholder attribute reflects.");
 </script>
 
@@ -254,6 +286,7 @@ test(function(t) {
     assert_equals(element.ariaPosInSet, "10");
     element.ariaPosInSet = "11";
     assert_equals(element.getAttribute("aria-posinset"), "11");
+    testNullable(element, "ariaPosInSet", "aria-posinset");
 }, "aria-posinset attribute reflects.");
 </script>
 
@@ -265,6 +298,7 @@ test(function(t) {
     assert_equals(element.ariaPressed, "true");
     element.ariaPressed = "false";
     assert_equals(element.getAttribute("aria-pressed"), "false");
+    testNullable(element, "ariaPressed", "aria-pressed");
 }, "aria-pressed attribute reflects.");
 </script>
 
@@ -275,6 +309,7 @@ test(function(t) {
     assert_equals(element.ariaReadOnly, "true");
     element.ariaReadOnly = "false";
     assert_equals(element.getAttribute("aria-readonly"), "false");
+    testNullable(element, "ariaReadOnly", "aria-readonly");
 }, "aria-readonly attribute reflects.");
 </script>
 
@@ -285,6 +320,7 @@ test(function(t) {
     assert_equals(element.ariaRelevant, "text");
     element.ariaRelevant = "removals";
     assert_equals(element.getAttribute("aria-relevant"), "removals");
+    testNullable(element, "ariaRelevant", "aria-relevant");
 }, "aria-relevant attribute reflects.");
 </script>
 
@@ -295,6 +331,7 @@ test(function(t) {
     assert_equals(element.ariaRequired, "true");
     element.ariaRequired = "false";
     assert_equals(element.getAttribute("aria-required"), "false");
+    testNullable(element, "ariaRequired", "aria-required");
 }, "aria-required attribute reflects.");
 </script>
 
@@ -305,6 +342,7 @@ test(function(t) {
     assert_equals(element.ariaRoleDescription, "x");
     element.ariaRoleDescription = "y";
     assert_equals(element.getAttribute("aria-roledescription"), "y");
+    testNullable(element, "ariaRoleDescription", "aria-roledescription");
 }, "aria-roledescription attribute reflects.");
 </script>
 
@@ -315,6 +353,7 @@ test(function(t) {
     assert_equals(element.ariaRowCount, "10");
     element.ariaRowCount = "11";
     assert_equals(element.getAttribute("aria-rowcount"), "11");
+    testNullable(element, "ariaRowCount", "aria-rowcount");
 }, "aria-rowcount attribute reflects.");
 </script>
 
@@ -325,6 +364,7 @@ test(function(t) {
     assert_equals(element.ariaRowIndex, "1");
     element.ariaRowIndex = "2";
     assert_equals(element.getAttribute("aria-rowindex"), "2");
+    testNullable(element, "ariaRowIndex", "aria-rowindex");
 }, "aria-rowindex attribute reflects.");
 </script>
 
@@ -335,6 +375,7 @@ test(function(t) {
     assert_equals(element.ariaRowSpan, "2");
     element.ariaRowSpan = "3";
     assert_equals(element.getAttribute("aria-rowspan"), "3");
+    testNullable(element, "ariaRowSpan", "aria-rowspan");
 }, "aria-rowspan attribute reflects.");
 </script>
 
@@ -345,6 +386,7 @@ test(function(t) {
     assert_equals(element.ariaSelected, "true");
     element.ariaSelected = "false";
     assert_equals(element.getAttribute("aria-selected"), "false");
+    testNullable(element, "ariaSelected", "aria-selected");
 }, "aria-selected attribute reflects.");
 </script>
 
@@ -355,6 +397,7 @@ test(function(t) {
     assert_equals(element.ariaSetSize, "10");
     element.ariaSetSize = "11";
     assert_equals(element.getAttribute("aria-setsize"), "11");
+    testNullable(element, "ariaSetSize", "aria-setsize");
 }, "aria-setsize attribute reflects.");
 </script>
 
@@ -365,6 +408,7 @@ test(function(t) {
     assert_equals(element.ariaSort, "descending");
     element.ariaSort = "ascending";
     assert_equals(element.getAttribute("aria-sort"), "ascending");
+    testNullable(element, "ariaSort", "aria-sort");
 }, "aria-sort attribute reflects.");
 </script>
 
@@ -375,6 +419,7 @@ test(function(t) {
     assert_equals(element.ariaValueMax, "99");
     element.ariaValueMax = "100";
     assert_equals(element.getAttribute("aria-valuemax"), "100");
+    testNullable(element, "ariaValueMax", "aria-valuemax");
 }, "aria-valuemax attribute reflects.");
 </script>
 
@@ -385,6 +430,7 @@ test(function(t) {
     assert_equals(element.ariaValueMin, "3");
     element.ariaValueMin = "2";
     assert_equals(element.getAttribute("aria-valuemin"), "2");
+    testNullable(element, "ariaValueMin", "aria-valuemin");
 }, "aria-valuemin attribute reflects.");
 </script>
 
@@ -395,6 +441,7 @@ test(function(t) {
     assert_equals(element.ariaValueNow, "50");
     element.ariaValueNow = "51";
     assert_equals(element.getAttribute("aria-valuenow"), "51");
+    testNullable(element, "ariaValueNow", "aria-valuenow");
 }, "aria-valuenow attribute reflects.");
 </script>
 
@@ -405,6 +452,7 @@ test(function(t) {
     assert_equals(element.ariaValueText, "50%");
     element.ariaValueText = "51%";
     assert_equals(element.getAttribute("aria-valuetext"), "51%");
+    testNullable(element, "ariaValueText", "aria-valuetext");
 }, "aria-valuetext attribute reflects.");
 </script>
 </html>
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-assorted.window.js b/tests/wpt/tests/html/dom/elements/global-attributes/dir-assorted.window.js
index d65cba7421c..038b3f78d4d 100644
--- a/tests/wpt/tests/html/dom/elements/global-attributes/dir-assorted.window.js
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-assorted.window.js
@@ -63,3 +63,20 @@ test(() => {
   assert_true(ele.matches(":dir(ltr)"), "is LTR after change");
   assert_true(ele2.matches(":dir(ltr)"), "child is LTR after change");
 }, "Non-HTML element text contents influence dir=auto");
+
+test(() => {
+  const e1 = document.createElement("div");
+  e1.dir = "auto";
+  const e2 = document.createElement("div");
+  e2.dir = "auto";
+  e2.innerText = "A";
+  e1.append(e2);
+  assert_true(e1.matches(":dir(ltr)"), "parent is LTR before changes");
+  assert_true(e2.matches(":dir(ltr)"), "child is LTR before changes");
+  e2.removeAttribute("dir");
+  assert_true(e1.matches(":dir(ltr)"), "parent is LTR after removing dir attribute on child");
+  assert_true(e2.matches(":dir(ltr)"), "child is LTR after removing dir attribute on child");
+  e2.firstChild.data = "\u05D0";
+  assert_false(e1.matches(":dir(ltr)"), "parent is RTL after changing text in child");
+  assert_false(e2.matches(":dir(ltr)"), "child is RTL after changing text in child");
+}, "text changes apply to dir=auto on further ancestor after removing dir=auto from closer ancestor");
diff --git a/tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html b/tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
similarity index 66%
rename from tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html
rename to tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
index 5e8cedb9c15..db783fc55ca 100644
--- a/tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.tentative.html
+++ b/tests/wpt/tests/html/dom/elements/global-attributes/dir-slots-directionality.html
@@ -51,8 +51,8 @@ test(() => {
   let root5 = host5.attachShadow({mode:"open"});
   root5.innerHTML = '<span dir="auto"><slot>اختبر</slot></span>';
   let span = root5.querySelector("span");
-  assert_equals(getComputedStyle(span).direction, "rtl");
-  assert_true(span.matches(":dir(rtl)"));
+  assert_equals(getComputedStyle(span).direction, "ltr");
+  assert_true(span.matches(":dir(ltr)"));
 }, 'Slots: Directionality: dir=auto in shadow tree with Arabic shadow tree content');
 
 test(() => {
@@ -63,4 +63,35 @@ test(() => {
   assert_true(span.matches(":dir(rtl)"));
 }, 'Slots: Directionality: dir=auto on slot with Arabic light tree content');
 
+test(() => {
+  let host = document.createElement("div");
+  host.dir = "rtl";
+  document.body.appendChild(host);
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = '<section dir="ltr"><div dir="auto"><slot></slot>A</div></section>';
+  let div = root.querySelector("div");
+  assert_true(div.matches(":dir(rtl)"));
+  host.remove();
+}, 'slot provides its directionality (from host) to a dir=auto container');
+
+test(() => {
+  let host = document.createElement("div");
+  document.body.appendChild(host);
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = '<div dir="auto"><span dir="ltr">A</span>\u05D0</div><slot></slot>';
+  let div = root.querySelector("div");
+  assert_true(div.matches(":dir(rtl)"));
+  host.remove();
+}, 'children with dir attribute are skipped by dir=auto');
+
+test(() => {
+  let host = document.createElement("div");
+  document.body.appendChild(host);
+  let root = host.attachShadow({mode:"open"});
+  root.innerHTML = '<div dir="auto"><slot dir="ltr"></slot>\u05D0</div>';
+  let div = root.querySelector("div");
+  assert_true(div.matches(":dir(rtl)"));
+  host.remove();
+}, 'slot with dir attribute is skipped by dir=auto');
+
 </script>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/beforematch-scroll-to-text-fragment.html b/tests/wpt/tests/html/editing/the-hidden-attribute/beforematch-scroll-to-text-fragment.html
new file mode 100644
index 00000000000..dddab4c6ba8
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/beforematch-scroll-to-text-fragment.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>beforematch fired on ScrollToTextFragment</title>
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script src="/common/utils.js"></script>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<script>
+promise_test(t => new Promise((resolve, reject) => {
+  const key = token();
+  test_driver.bless('Open a scroll to text fragment URL', () => {
+    window.open(
+      `resources/beforematch-scroll-to-text-fragment-basic.html?key=${key}#:~:text=foo`,
+      '_blank',
+      'noopener');
+  });
+  fetchResults(key, resolve, reject);
+}).then(results => {
+  assert_equals(results.pageYOffsetDuringBeforematch, 0,
+    'Scrolling should happen after beforematch is fired.');
+  assert_true(results.beforematchFiredOnFoo,
+    'Foo was searched for, so it should get a beforematch event.');
+  assert_false(results.beforematchFiredOnBar,
+    'Bar was not searched for, so it should not get a beforematch event.');
+  assert_true(results.pageYOffsetAfterRaf > 0,
+    'The page should be scrolled down to foo.');
+}), 'Verifies that the beforematch event is fired on the matching element of a ScrollToTextFragment navigation.');
+
+promise_test(t => new Promise((resolve, reject) => {
+  const key = token();
+  test_driver.bless('Open a scroll to text fragment URL', () => {
+    window.open(
+      `resources/beforematch-scroll-to-text-fragment-with-anchor.html?key=${key}#:~:text=foo`,
+      '_blank',
+      'noopener');
+  });
+  fetchResults(key, resolve, reject);
+}).then(results => {
+  assert_true(results.beforematchFiredOnFoo,
+    'foo was searched for, so it should get the beforematch event.');
+  assert_false(results.beforematchFiredOnBar,
+    'bar should not get the beforematch event despite being the target of an element fragment due to the text fragment.');
+}), 'Verifies that beforematch is only fired on elements targeted by a text fragment when there is both a text fragment and an element fragment.');
+
+promise_test(t => new Promise((resolve, reject) => {
+  const key = token();
+  test_driver.bless('Open a scroll to text fragment URL', () => {
+    window.open(
+      `resources/beforematch-scroll-to-text-fragment-bubble.html?key=${key}#:~:text=foo`,
+      '_blank',
+      'noopener');
+  });
+  fetchResults(key, resolve, reject);
+}).then(results => {
+  assert_true(results.beforematchFiredOnChild,
+    'The element containing the searched text should have beforematch fired on it.');
+  assert_true(results.beforematchFiredOnParent,
+    'The parent element of the element containing the matching text should have the beforematch event fired on it because the event should bubble.');
+}), 'Verifies that the beforematch event bubbles with scroll to text fragment.');
+
+// TODO(jarhar): Write more tests here once we decide on a behavior here: https://github.com/WICG/display-locking/issues/150
+</script>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-001.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-001.html
new file mode 100644
index 00000000000..3c87b985dcc
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-001.html
@@ -0,0 +1,49 @@
+<!doctype HTML>
+
+<html class="reftest-wait">
+<meta charset="utf8">
+<title>content-visibility changes after a delay</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<link rel="match" href="./resources/container-ref.html">
+<meta name="assert" content="scrollIntoView has no effect on hidden=until-found">
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+#container {
+  width: 150px;
+  height: 150px;
+  background: lightblue;
+}
+#child {
+  width: 50px;
+  height: 50px;
+  background: lightgreen;
+}
+</style>
+
+<div id=container hidden=until-found>
+  Text.
+  <div id=child></div>
+</div>
+
+
+<script>
+
+function runTest() {
+  document.getElementById("container").scrollIntoView();
+  takeScreenshot();
+}
+
+window.onload = requestAnimationFrame(() => {
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      runTest();
+    });
+  });
+});
+
+</script>
+</html>
+
+
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html
new file mode 100644
index 00000000000..a454e3a0091
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-002.html
@@ -0,0 +1,43 @@
+<!doctype HTML>
+<meta charset="utf8">
+<title>Content Visibility: tab order navigation ignores hidden=until-found subtrees</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<meta name="assert" content="tab order navigation ignores hidden=until-found subtrees.">
+
+<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>
+
+<input id=one type=text></input>
+<div hidden=until-found>
+  <input id=two type=text></input>
+  <input id=three type=text></input>
+  <input id=four type=text></input>
+</div>
+<input id=five type=text></input>
+
+<script>
+async_test((t) => {
+  const tab = "\t";
+  async function step1() {
+    await test_driver.send_keys(document.body, tab);
+    t.step(() => {
+      assert_equals(document.activeElement, document.getElementById("one"));
+    });
+    requestAnimationFrame(step2);
+  }
+
+  async function step2() {
+    await test_driver.send_keys(document.body, tab);
+    t.step(() => {
+      assert_equals(document.activeElement, document.getElementById("five"));
+    });
+    t.done();
+  }
+
+  window.onload = () => { requestAnimationFrame(step1); };
+}, "Tab order navigation skips hidden=until-found subtrees");
+</script>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-004.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-004.html
new file mode 100644
index 00000000000..3ca6feb7a3d
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-004.html
@@ -0,0 +1,28 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>hidden=until-found does not paint</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<link rel="match" href="./resources/container-ref.html">
+<meta name="assert" content="content-visibility subtrees are not painted">
+
+<style>
+#container {
+  width: 150px;
+  height: 150px;
+  background: lightblue;
+}
+#child {
+  width: 50px;
+  height: 50px;
+  background: lightgreen;
+}
+</style>
+
+<div id=container hidden=until-found>
+  Text.
+  <div id=child></div>
+  <span>inline child</span>
+</div>
+</html>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005-ref.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005-ref.html
new file mode 100644
index 00000000000..0ca77849a46
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005-ref.html
@@ -0,0 +1,17 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>Content Visibility: hidden-matchable and size contained (reference)</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+
+<style>
+div {
+  border: 1px solid black;
+}
+</style>
+
+Test passes if there is a empty div with border below.
+<div></div>
+</html>
+
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005.html
new file mode 100644
index 00000000000..fabf636ec94
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-005.html
@@ -0,0 +1,22 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>hidden=until-found and size contained</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<link rel="match" href="hidden-until-found-005-ref.html">
+<meta name="assert" content="hidden=until-found puts in size containment">
+
+<style>
+div {
+  border: 1px solid black;
+}
+</style>
+
+Test passes if there is a empty div with border below.
+<div hidden=until-found>
+  This text is not visible, and neither should be the div below.
+  <div style="width: 100px; height: 100px; background: red"></div>
+</div>
+</html>
+
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-006-ref.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-006-ref.html
new file mode 100644
index 00000000000..e14ba82c278
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-006-ref.html
@@ -0,0 +1,40 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>content-visibility hidden-matchable + scrollIntoView (reference)</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+
+<style>
+.spacer {
+  height: 1000px;
+  background: lightgreen;
+}
+#container {
+  width: 150px;
+  height: 150px;
+  background: lightblue;
+}
+#target {
+  position: relative;
+  top: 75px;
+  visibility: hidden;
+
+  width: 50px;
+  height: 50px;
+  background: red;
+}
+</style>
+
+<div>top of the page</div>
+<div class=spacer></div>
+<div id=container>
+  <div id=target></div>
+</div>
+<div class=spacer></div>
+<div>bottom of the page</div>
+
+<script>
+onload = () => document.getElementById("target").scrollIntoView();
+</script>
+</html>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-007.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-007.html
new file mode 100644
index 00000000000..7b11a92cc93
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-007.html
@@ -0,0 +1,52 @@
+<!doctype HTML>
+
+<html class="reftest-wait">
+<meta charset="utf8">
+<title>hidden=until-found + focus</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<link rel="match" href="./resources/spacer-and-container-ref.html">
+<meta name="assert" content="focus does not scroll or focus element under hidden=until-found">
+<script src="/common/reftest-wait.js"></script>
+
+<style>
+.spacer {
+  width: 150px;
+  height: 3000px;
+  background: lightblue;
+}
+#container {
+  width: 150px;
+  height: 150px;
+  background: lightblue;
+}
+#target {
+  position: relative;
+  top: 75px;
+
+  width: 50px;
+  height: 50px;
+  background: red;
+}
+</style>
+
+<div class=spacer></div>
+<div id=container hidden=until-found>
+  <div id=target tabindex=0></div>
+</div>
+
+<script>
+function runTest() {
+  document.getElementById("target").focus();
+  requestAnimationFrame(takeScreenshot);
+}
+
+window.onload = requestAnimationFrame(() => {
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      runTest();
+    });
+  });
+});
+</script>
+</html>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-text-fragment.html b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-text-fragment.html
new file mode 100644
index 00000000000..05220f7ce11
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/hidden-until-found-text-fragment.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>beforematch fired on ScrollToTextFragment</title>
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script src="/common/utils.js"></script>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<script>
+promise_test(t => new Promise((resolve, reject) => {
+  const key = token();
+  test_driver.bless('Open a scroll to text fragment URL', () => {
+    window.open(
+      `resources/hidden-until-found-text-fragment.html?key=${key}#:~:text=foo`,
+      '_blank',
+      'noopener');
+  });
+  fetchResults(key, resolve, reject);
+}).then(results => {
+  assert_false(results.targetHasHiddenAttribute,
+    'The matching hidden=until-found element should have its hidden attribute removed so it can be scrolled to.');
+  assert_true(results.pageYOffsetAfterRaf > 0,
+    'The page should be scrolled down to foo.');
+}), 'Verifies that the beforematch event is fired on the matching element of a ScrollToTextFragment navigation.');
+</script>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-basic.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-basic.html
new file mode 100644
index 00000000000..884e9a67fae
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-basic.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<!-- This test is navigated to with the fragment #:~:text=foo -->
+
+<body>
+  <div style="height: 4000px;">spacer</div>
+  <script>
+    const results = {};
+
+    const foo = document.createElement('div');
+    foo.textContent = 'foo';
+    foo.hidden = 'until-found';
+    document.body.appendChild(foo);
+    window.beforematchFiredOnFoo = false;
+    foo.addEventListener('beforematch', () => {
+      // This should be zero. Scrolling should happen after beforematch is
+      // fired.
+      results.pageYOffsetDuringBeforematch = window.pageYOffset;
+      window.beforematchFiredOnFoo = true;
+    });
+
+    const bar = document.createElement('div');
+    bar.textContent = 'bar';
+    document.body.appendChild(bar);
+    window.beforematchFiredOnBar = false;
+    bar.addEventListener('beforematch', () => {
+      window.beforematchFiredOnBar = true;
+    });
+
+    requestAnimationFrame(() => {
+      requestAnimationFrame(async () => {
+        // This should be true. Foo was searched for, so it should get a
+        // beforematch event.
+        results.beforematchFiredOnFoo = window.beforematchFiredOnFoo;
+        // This should be false. Bar was not searched for, so it should not get
+        // a beforematch event.
+        results.beforematchFiredOnBar = window.beforematchFiredOnBar;
+        // This should be greater than zero. The page should be scrolled down
+        // to foo.
+        results.pageYOffsetAfterRaf = window.pageYOffset;
+
+        params = new URLSearchParams(window.location.search);
+        stashResultsThenClose(params.get('key'), results);
+      });
+    });
+  </script>
+</body>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-bubble.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-bubble.html
new file mode 100644
index 00000000000..abfe8ddd544
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-bubble.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<!-- This test is navigated to with the fragment #:~:text=foo -->
+
+<div id=parentid>
+  <div id=childid hidden=until-found>foo</div>
+</div>
+
+<script>
+  const results = {
+    beforematchFiredOnChild: false,
+    beforematchFiredOnParent: false
+  };
+
+  childid.addEventListener('beforematch', () => {
+    results.beforematchFiredOnChild = true;
+  });
+
+  parentid.addEventListener('beforematch', () => {
+    results.beforematchFiredOnParent = true;
+  });
+
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      const params = new URLSearchParams(window.location.search);
+      stashResultsThenClose(params.get('key'), results);
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-with-anchor.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-with-anchor.html
new file mode 100644
index 00000000000..3506c6e60ca
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/beforematch-scroll-to-text-fragment-with-anchor.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<!-- This test is navigated to with the fragment #bar:~:text=foo -->
+
+<body>
+  <div id=foo hidden=until-found>foo</div>
+  <div id=bar hidden=until-found>bar</div>
+  <script>
+    window.beforematchFiredOnFoo = false;
+    foo.addEventListener('beforematch', () => {
+      window.beforematchFiredOnFoo = true;
+    });
+
+    window.beforematchFiredOnBar = false;
+    bar.addEventListener('beforematch', () => {
+      window.beforematchFiredOnBar = true;
+    });
+
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        const results = {};
+        // This should be true. Foo was searched for, so it should get the
+        // beforematch event.
+        results.beforematchFiredOnFoo = window.beforematchFiredOnFoo;
+        // This should be false. Bar should not get the beforematch event
+        // despite being the target of an element fragment due to the text
+        // fragment.
+        results.beforematchFiredOnBar = window.beforematchFiredOnBar;
+
+        params = new URLSearchParams(window.location.search);
+        stashResultsThenClose(params.get('key'), results);
+      });
+    });
+  </script>
+</body>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/container-ref.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/container-ref.html
new file mode 100644
index 00000000000..e2df59014b0
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/container-ref.html
@@ -0,0 +1,17 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>CSS Content Visibility: container (reference)</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+
+<style>
+#container {
+  width: 150px;
+  height: 150px;
+  background: lightblue;
+}
+</style>
+
+<div id=container></div>
+
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/hidden-until-found-text-fragment.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/hidden-until-found-text-fragment.html
new file mode 100644
index 00000000000..fe89b407e65
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/hidden-until-found-text-fragment.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<!-- This test is navigated to with the fragment #:~:text=foo -->
+
+<body>
+  <div style="height: 4000px;">spacer</div>
+  <div id=target hidden=until-found>foo</div>
+  <script>
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        const results = {};
+        // This should be false. The hidden=until-found attribute should be
+        // removed in response to ScrollToTextFragment.
+        results.targetHasHiddenAttribute = document.getElementById('target').hasAttribute('hidden');
+        // This should be greater than zero. The page should be scrolled down
+        // to foo.
+        results.pageYOffsetAfterRaf = window.pageYOffset;
+
+        params = new URLSearchParams(window.location.search);
+        stashResultsThenClose(params.get('key'), results);
+      });
+    });
+  </script>
+</body>
diff --git a/tests/wpt/tests/html/editing/the-hidden-attribute/resources/spacer-and-container-ref.html b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/spacer-and-container-ref.html
new file mode 100644
index 00000000000..816a6c9a9d8
--- /dev/null
+++ b/tests/wpt/tests/html/editing/the-hidden-attribute/resources/spacer-and-container-ref.html
@@ -0,0 +1,23 @@
+<!doctype HTML>
+<html>
+<meta charset="utf8">
+<title>Content Visibility: spacer and a container (reference)</title>
+<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+
+<style>
+.spacer {
+  width: 150px;
+  height: 3000px;
+  background: lightblue;
+}
+#container {
+  contain: style layout;
+  width: 150px;
+  height: 150px;
+}
+</style>
+
+<div class="spacer"></div>
+<div id="container"></div>
+</html>
diff --git a/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html b/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
index 14e712ce254..dab8d2122b6 100644
--- a/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
+++ b/tests/wpt/tests/html/infrastructure/urls/base-url/document-base-url-changes-about-srcdoc-2.https.html
@@ -3,16 +3,20 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/get-host-info.sub.js"></script>
 
+<iframe src='about:blank'></iframe>
+
 <script>
 // If document.open's behavior is modified to remove the url-rewriting behavior,
 // then this test can be deleted (https://github.com/whatwg/html/issues/3989).
 setup({ explicit_done: true });
 
+// This function is called by directly by the child iframe (above), with the
+// child iframe's document. The child iframe's document contains an about:srcdoc iframe.
 window.start = childDocument => {
   const grandchildDocument =
     childDocument.getElementById('foo').contentDocument;
 
-  test(t => {
+  test(() => {
     assert_equals(childDocument.URL, 'about:blank',
       'Child document starting URL');
     assert_equals(grandchildDocument.URL, 'about:srcdoc',
@@ -45,27 +49,19 @@ window.start = childDocument => {
 
   done();
 };
-</script>
 
-<iframe src='about:blank'></iframe>
+let subframe_doc = document.querySelector('iframe').contentDocument;
+subframe_doc.body.innerHTML = '<iframe srcdoc="foo" id="foo"></iframe>';
+promise_test(async t => {
+  const grandchildIframe = subframe_doc.querySelector('iframe');
+  await new Promise(resolve => {
+    grandchildIframe.onload = resolve;
+  });
 
-<script>
-  window.onload = () => {
-    let subframe_doc = document.querySelector('iframe').contentDocument;
-    subframe_doc.body.innerHTML = '<iframe srcdoc="foo" id="foo"></iframe>';
-    promise_test((test) => {
-      return new Promise(async resolve => {
-      // We need a timeout since the srcdoc frame takes time to setup and
-      // doesn't fire a loadstop.
-      test.step_timeout(resolve, 100);
-      }).then(() => {
-        assert_equals(
-            subframe_doc.getElementById('foo').contentDocument.URL,
-            'about:srcdoc');
-        let script = subframe_doc.createElement('script');
-        script.innerHTML = 'parent.start(document);';
-        subframe_doc.body.appendChild(script);
-      });
-    }, "wrapper promise test for timeout.");
-  };
+  assert_equals(grandchildIframe.contentDocument.URL, 'about:srcdoc');
+
+  let script = subframe_doc.createElement('script');
+  script.innerHTML = 'parent.start(document);';
+  subframe_doc.body.appendChild(script);
+}, "wrapper promise test for timeout.");
 </script>
diff --git a/tests/wpt/tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js b/tests/wpt/tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
index 1c4a77705e5..74c4c2e9975 100644
--- a/tests/wpt/tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
+++ b/tests/wpt/tests/html/infrastructure/urls/resolving-urls/query-encoding/resources/resolve-url.js
@@ -199,7 +199,9 @@ onload = function() {
     subsetTestByKey('loading', async_test, function() {
       var elm = document.createElement(tag);
       var video_ext = '';
-      if (elm.canPlayType('video/ogg; codecs="theora,flac"')) {
+      if (elm.canPlayType('video/webm; codecs="vp9,opus"')) {
+        video_ext = 'webm';
+      } else if (elm.canPlayType('video/ogg; codecs="theora,flac"')) {
         video_ext = 'ogv';
       } else if (elm.canPlayType('video/mp4; codecs="avc1.42E01E,mp4a.40.2"')) {
         video_ext = 'mp4';
diff --git a/tests/wpt/tests/html/rendering/the-details-element/auto-expand-details-text-fragment.html b/tests/wpt/tests/html/rendering/the-details-element/auto-expand-details-text-fragment.html
new file mode 100644
index 00000000000..321d82c02d0
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/auto-expand-details-text-fragment.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>beforematch fired on ScrollToTextFragment</title>
+<link rel="author" title="Joey Arhar" href="mailto:jarhar@chromium.org">
+<link rel="help" href="https://github.com/WICG/display-locking">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<script src="/common/utils.js"></script>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<script>
+promise_test(t => new Promise((resolve, reject) => {
+  const key = token();
+  test_driver.bless('Open a scroll to text fragment URL', () => {
+    window.open(
+      `resources/auto-expand-details-text-fragment.html?key=${key}#:~:text=foo`,
+      '_blank',
+      'noopener');
+  });
+  fetchResults(key, resolve, reject);
+}).then(results => {
+  assert_true(results.detailsHasOpenAttribute,
+    'The matching closed details element should be open.');
+  assert_true(results.pageYOffsetAfterRaf > 0,
+    'The page should be scrolled down to the match.');
+}), 'Verifies that the beforematch event is fired on the matching element of a ScrollToTextFragment navigation.');
+</script>
diff --git a/tests/wpt/tests/html/rendering/the-details-element/resources/auto-expand-details-text-fragment.html b/tests/wpt/tests/html/rendering/the-details-element/resources/auto-expand-details-text-fragment.html
new file mode 100644
index 00000000000..b95459fe5c0
--- /dev/null
+++ b/tests/wpt/tests/html/rendering/the-details-element/resources/auto-expand-details-text-fragment.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<script src="/scroll-to-text-fragment/stash.js"></script>
+
+<!-- This test is navigated to with the fragment #:~:text=foo -->
+
+<body>
+  <div style="height: 4000px;">spacer</div>
+  <details>
+    <div>foo</div>
+  </details>
+  <script>
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        const results = {};
+        // This should be true. The details element should be opened by
+        // ScrollToTextFragment because it has matching text.
+        results.detailsHasOpenAttribute = document.querySelector('details').hasAttribute('open');
+        // This should be greater than zero. The page should be scrolled down
+        // to the matching target.
+        results.pageYOffsetAfterRaf = window.pageYOffset;
+
+        params = new URLSearchParams(window.location.search);
+        stashResultsThenClose(params.get('key'), results);
+      });
+    });
+  </script>
+</body>
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.tentative.html
similarity index 97%
rename from tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.tentative.html
index 0bf64c181d0..198fec56d36 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-number.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-number.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: content;
+  field-sizing: content;
 }
 
 .small-placeholder {
@@ -51,7 +51,7 @@ function addTwoElements(source1, source2) {
   test(() => {
     let pair = addElements(`<input type=${type}>`);
     // A text <input> has approximately 20ch width by default.
-    // A text <input> with form-sizing:content must be shorter than the default.
+    // A text <input> with field-sizing:content must be shorter than the default.
     assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
     assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
@@ -142,7 +142,7 @@ function addTwoElements(source1, source2) {
      element.classList.add('disable-default');
      assert_less_than(element.offsetWidth, w);
      assert_equals(element.offsetHeight, h);
-  }, `${type}: Update form-sizing property dynamically`);
+  }, `${type}: Update field-sizing property dynamically`);
 
 });
 </script>
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.tentative.html
similarity index 97%
rename from tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.tentative.html
index 065994471f0..23af2d9da94 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-input-text.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/field-sizing-input-text.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: content;
+  field-sizing: content;
 }
 
 .small-placeholder {
@@ -50,7 +50,7 @@ function addTwoElements(source1, source2) {
   test(() => {
     let pair = addElements(`<input type=${type}>`);
     // A text <input> has approximately 20ch width by default.
-    // A text <input> with form-sizing:content must be shorter than the default.
+    // A text <input> with field-sizing:content must be shorter than the default.
     assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
     assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
@@ -147,7 +147,7 @@ function addTwoElements(source1, source2) {
      element.classList.add('disable-default');
      assert_less_than(element.offsetWidth, w);
      assert_equals(element.offsetHeight, h);
-  }, `${type}: Update form-sizing property dynamically`);
+  }, `${type}: Update field-sizing property dynamically`);
 
 });
 </script>
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-select.tentative.html
similarity index 89%
rename from tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-select.tentative.html
index 7ce6f03ff4b..f8c115a8851 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-select.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/field-sizing-select.tentative.html
@@ -5,7 +5,7 @@
 <body>
 <style>
 .disable-default {
-  form-sizing: content;
+  field-sizing: content;
 }
 </style>
 <div id="container"></div>
@@ -18,7 +18,7 @@ const DISABLE = 'class="disable-default"';
 test(() => {
   const s = '<select>><option>1<option>quick brown<option>fox</select>';
   container.innerHTML = s + s;
-  container.lastElementChild.style.formSizing = 'content';
+  container.lastElementChild.style.fieldSizing = 'content';
   const widthForContent1 = container.lastElementChild.offsetWidth;
   assert_greater_than(container.firstElementChild.offsetWidth,
                       widthForContent1);
@@ -31,11 +31,11 @@ test(() => {
   container.innerHTML = '<select><option>foo<option>quick brown fox</select>';
   const select = container.firstElementChild;
   const initialWidth = select.offsetWidth;
-  select.style.formSizing = 'content';
+  select.style.fieldSizing = 'content';
   assert_less_than(select.offsetWidth, initialWidth);
-  select.style.formSizing = 'fixed';
+  select.style.fieldSizing = 'fixed';
   assert_equals(select.offsetWidth, initialWidth);
-}, 'dropdown: Change the form-sizing value dynamically');
+}, 'dropdown: Change the field-sizing value dynamically');
 
 // Tests for list box =========================================================
 
@@ -76,11 +76,11 @@ if (container.firstElementChild.offsetHeight != container.lastElementChild.offse
     container.innerHTML = '<select multiple><option>foo<option>quick brown fox</select>';
     const select = container.firstElementChild;
     const initialHeight = select.offsetHeight;
-    select.style.formSizing = 'content';
+    select.style.fieldSizing = 'content';
     assert_less_than(select.offsetHeight, initialHeight);
-    select.style.formSizing = 'fixed';
+    select.style.fieldSizing = 'fixed';
     assert_equals(select.offsetHeight, initialHeight);
-  }, 'listbox: Change the form-sizing value dynamically');
+  }, 'listbox: Change the field-sizing value dynamically');
 
 }
 </script>
diff --git a/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html b/tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.tentative.html
similarity index 97%
rename from tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html
rename to tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.tentative.html
index fb4ce762e32..3682a516590 100644
--- a/tests/wpt/tests/html/rendering/widgets/form-sizing-textarea.tentative.html
+++ b/tests/wpt/tests/html/rendering/widgets/field-sizing-textarea.tentative.html
@@ -4,7 +4,7 @@
 <script src="/resources/testharnessreport.js"></script>
 <style>
 .disable-default {
-  form-sizing: content;
+  field-sizing: content;
 }
 
 .small-placeholder {
@@ -49,7 +49,7 @@ function addTwoElements(source1, source2) {
 test(() => {
   let pair = addElements('<textarea></textarea>');
   // Historically a <textarea> has approximately 20ch x 2lh size by default.
-  // A <textarea> with form-sizing:content must be samller than the default.
+  // A <textarea> with field-sizing:content must be samller than the default.
   assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth);
   assert_less_than(pair.content.offsetHeight, pair.fixed.offsetHeight);
 
@@ -136,6 +136,6 @@ test(() => {
    element.classList.add('disable-default');
    assert_less_than(element.offsetWidth, w);
    assert_less_than(element.offsetHeight, h);
-}, 'Update form-sizing property dynamically');
+}, 'Update field-sizing property dynamically');
 </script>
 </body>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html
new file mode 100644
index 00000000000..611221d8014
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-base-url-3.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<head>
+  <title>Deferred iframes with loading='lazy' changed to eager later
+         use the document's base URL computed at parse-time</title>
+  <link rel="author" title="Oliver Medhurst" href="mailto:omedhurst@mozilla.com">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="../resources/common.js"></script>
+  <base href='/html/semantics/embedded-content/the-iframe-element/resources/'>
+</head>
+
+<script>
+  const below_viewport_iframe = new ElementLoadPromise("below-viewport");
+
+  let has_window_loaded = false;
+
+  async_test(t => {
+    // Change the base URL and scroll down to load the deferred iframe.
+    window.addEventListener("load", t.step_func(() => {
+      const base = document.querySelector('base');
+      base.href = '/invalid-url-where-no-subresources-exist/';
+      has_window_loaded = true;
+      below_viewport_iframe.element().loading = 'eager';
+    }));
+
+    below_viewport_iframe.promise.then(
+      t.step_func_done(() => {
+        assert_true(has_window_loaded,
+                    "Below-viewport loading=lazy iframes do not block the " +
+                    "window load event");
+        assert_true(below_viewport_iframe.element().contentDocument.body.
+                    innerHTML.includes("<p>Subframe</p>"),
+                    "The loading=lazy iframe's content is accessible upon loading");
+    }));
+
+  }, "When a loading=lazy iframe is changed to eager later before loading, it loads relative to the " +
+     "document's base URL computed at parse-time.");
+</script>
+
+<body>
+  <div style="height:1000vh"></div>
+  <iframe id="below-viewport" src="subframe.html" loading="lazy"
+          width="200px" height="100px" onload="below_viewport_iframe.resolve()">
+  </iframe>
+</body>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto-ref.html b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto-ref.html
index efa75bb20a6..66b42e40253 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto-ref.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto-ref.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
 <html>
   <title>Verifies that video poster is shown even if video element has 'preload="auto"' attribute</title>
-  <video preload="none" poster="/media/poster.png" src="/media/video.ogv" width="100" height="100"></video>
+  <video preload="none" poster="/media/poster.png" src="/media/video.webm" width="100" height="100"></video>
 </html>
diff --git a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto.html b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto.html
index 243924628c0..95e32bb77ce 100644
--- a/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto.html
+++ b/tests/wpt/tests/html/semantics/embedded-content/the-video-element/video-poster-shown-preload-auto.html
@@ -2,7 +2,7 @@
 <html class="reftest-wait">
   <title>Verifies that video poster is shown even if video element has 'preload="auto"' attribute</title>
   <link rel="match" href="video-poster-shown-preload-auto-ref.html">
-  <video preload="auto" poster="/media/poster.png" src="/media/video.ogv" width="100" height="100"></video>
+  <video preload="auto" poster="/media/poster.png" src="/media/video.webm" width="100" height="100"></video>
   <script>
     const video = document.querySelector("video");
     video.oncanplaythrough = () => document.documentElement.classList.remove("reftest-wait");
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-button-closes-listbox.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-button-closes-listbox.tentative.html
new file mode 100644
index 00000000000..d3e6febd788
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-button-closes-listbox.tentative.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1408838">
+<link rel=help href="https://github.com/openui/open-ui/issues/639">
+<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>
+
+<selectlist id=defaultbutton-defaultlistbox>
+  <option>one</option>
+  <option>two</option>
+</selectlist>
+
+<selectlist id=custombutton-defaultlistbox>
+  <button type=selectlist>custom button</button>
+  <option>one</option>
+  <option>two</option>
+</selectlist>
+
+<selectlist id=defaultbutton-customlistbox>
+  <listbox>
+    <option>one</option>
+    <option>two</option>
+  </listbox>
+</selectlist>
+
+<selectlist id=custombutton-customlistbox>
+  <button type=selectlist>custom button</button>
+  <listbox>
+    <option>one</option>
+    <option>two</option>
+  </listbox>
+</selectlist>
+
+<script>
+document.querySelectorAll('selectlist').forEach(selectlist => {
+  promise_test(async () => {
+    assert_false(selectlist.matches(':open'),
+      'The listbox should not be showing at the start of the test.');
+
+    await test_driver.click(selectlist);
+    assert_true(selectlist.matches(':open'),
+      'The listbox should be showing after clicking the button.');
+
+    await test_driver.click(selectlist);
+    assert_false(selectlist.matches(':open'),
+      'The listbox should be closed after clicking the button.');
+  }, `${selectlist.id}: Clicking the selectlist's button should toggle the listbox.`);
+});
+</script>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-events.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-events.tentative.html
index 94577815cd0..a88a3b1f7da 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-events.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-events.tentative.html
@@ -130,20 +130,15 @@
 
   promise_test(async () => {
     const selectList = document.getElementById("selectList2");
-    let input_event_count = 0;
-    let change_event_count = 0;
+    const events = [];
 
     selectList.addEventListener("input", (e) => {
-      assert_true(e.composed, "input event should be composed");
-      assert_equals(input_event_count, 0, "input event should not fire twice");
-      assert_equals(change_event_count, 0, "input event should not fire before change");
-      input_event_count++;
+      assert_true(e.composed, "input event should be composed.");
+      events.push('input');
     });
     selectList.addEventListener("change", (e) => {
-      assert_false(e.composed, "change event should not be composed");
-      assert_equals(input_event_count, 1, "change event should fire after input");
-      assert_equals(change_event_count, 0, "change event should not fire twice");
-      change_event_count++;
+      assert_false(e.composed, "change event should not be composed.");
+      events.push('change');
     });
 
     await clickOn(selectList);
@@ -151,47 +146,39 @@
     await test_driver.send_keys(selectList, KEY_CODE_MAP.Enter);
     assert_false(selectList.open);
     assert_equals(selectList.value, "one");
-    assert_equals(input_event_count, 0, "input event shouldn't fire if value wasn't changed");
-    assert_equals(change_event_count, 0, "change event shouldn't fire if value wasn't changed");
+    assert_array_equals(events, [], "input and change shouldn't fire if value wansn't changed.");
 
     await clickOn(selectList);
     assert_true(selectList.open);
     await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowDown);
-    assert_equals(selectList.value, "two", "value should change when user switches options with arrow key");
-    assert_equals(input_event_count, 1, "input event should fire when user switches options with arrow key");
-    assert_equals(change_event_count, 0, "change event shouldn't fire until popover is closed");
+    assert_equals(selectList.value, "one", "value shouldn't change when user switches options with arrow key.");
+    assert_array_equals(events, ['input'], "input event should fire when user switches options with arrow key.");
 
     await test_driver.send_keys(selectList, KEY_CODE_MAP.Enter);
     assert_equals(selectList.value, "two");
-    assert_equals(input_event_count, 1, "input event should have fired");
-    assert_equals(change_event_count, 1, "change event should have fired");
-  }, "<selectlist> should fire input and change events when new option is selected");
+    assert_array_equals(events, ['input', 'input', 'change'], "input and change should fire after pressing enter.");
+  }, "<selectlist> should fire input and change events when new option is selected.");
 
   promise_test(async () => {
     const selectList = document.getElementById("selectList3");
-    let input_event_count = 0;
-    let change_event_count = 0;
+    const events = [];
 
     selectList.addEventListener("input", (e) => {
-      assert_true(e.composed, "input event should be composed");
-      assert_equals(input_event_count, 0, "input event should not fire twice");
-      assert_equals(change_event_count, 0, "input event should not fire before change");
-      input_event_count++;
+      assert_true(e.composed, "input event should be composed.");
+      events.push('input');
     });
     selectList.addEventListener("change", (e) => {
-      assert_false(e.composed, "change event should not be composed");
-      assert_equals(input_event_count, 1, "change event should fire after input");
-      assert_equals(change_event_count, 0, "change event should not fire twice");
-      change_event_count++;
+      assert_false(e.composed, "change event should not be composed.");
+      events.push('change');
     });
 
     await clickOn(selectList);
     assert_true(selectList.open);
     await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowDown);
+    assert_array_equals(events, ['input'], "input event should have fired after ArrowDown.");
     await test_driver.send_keys(selectList, KEY_CODE_MAP.Enter);
-    assert_equals(input_event_count, 1, "input event should have fired");
-    assert_equals(change_event_count, 1, "change event should have fired");
-  }, "<selectlist> should fire input and change events even when new selected option has the same value as the old");
+    assert_array_equals(events, ['input', 'input', 'change'], "input and change should fire after pressing Enter.");
+  }, "<selectlist> should fire input and change events even when new selected option has the same value as the old.");
 
   promise_test(async () => {
     const selectList = document.getElementById("selectList4");
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard-behavior.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard-behavior.tentative.html
new file mode 100644
index 00000000000..a70ab7e6a5d
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard-behavior.tentative.html
@@ -0,0 +1,182 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1422275">
+<link rel=help href="https://github.com/openui/open-ui/issues/433#issuecomment-1452461404">
+<link rel=help href="https://github.com/openui/open-ui/issues/386#issuecomment-1452469497">
+<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>
+
+<form></form>
+
+<div id=notform>
+  <selectlist id=defaultbutton>
+    <option class=one>one</option>
+    <option class=two>two</option>
+    <option class=three>three</option>
+  </selectlist>
+
+  <selectlist id=custombutton>
+    <button type=selectlist>custom button</button>
+    <option class=one>one</option>
+    <option class=two>two</option>
+    <option class=three>three</option>
+  </selectlist>
+</div>
+
+<script>
+const Enter = '\uE007';
+const Escape = '\uE00C';
+const ArrowLeft = '\uE012';
+const ArrowUp = '\uE013';
+const ArrowRight = '\uE014';
+const ArrowDown = '\uE015';
+const Space = ' ';
+const form = document.querySelector('form');
+const notform = document.getElementById('notform');
+
+for (const id of ['defaultbutton', 'custombutton']) {
+  const selectlist = document.getElementById(id);
+
+  async function closeListbox() {
+    await test_driver.click(selectlist);
+  }
+
+  function addCloseCleanup(t) {
+    t.add_cleanup(async () => {
+      if (selectlist.matches(':open')) {
+        await closeListbox();
+      }
+      if (selectlist.matches(':open')) {
+        throw new Error('selectlist failed to close!');
+      }
+      selectlist.value = 'one';
+    });
+  }
+
+  promise_test(async t => {
+    addCloseCleanup(t);
+    // TODO(http://crbug.com/1350299): When focus for custom buttons is fixed,
+    // then we shouldn't need to explicitly focus the custom button like this
+    // anymore.
+    const customButton = selectlist.querySelector('button');
+    if (customButton) {
+      customButton.focus();
+    } else {
+      selectlist.focus();
+    }
+    assert_false(selectlist.matches(':open'),
+      'The selectlist should initially be closed.');
+    await test_driver.send_keys(selectlist, Space);
+    assert_true(selectlist.matches(':open'),
+      'The selectlist should be open after pressing space.');
+  }, `${id}: When the listbox is closed, spacebar should open the listbox.`);
+
+  promise_test(async t => {
+    addCloseCleanup(t);
+    selectlist.value = 'two';
+    selectlist.focus();
+    assert_false(selectlist.matches(':open'),
+      'The selectlist should initially be closed.');
+
+    await test_driver.send_keys(selectlist, ArrowLeft);
+    assert_true(selectlist.matches(':open'),
+      'Arrow left should open the listbox.');
+    assert_equals(selectlist.value, 'two',
+      'Arrow left should not change the selected value.');
+    await closeListbox();
+
+    await test_driver.send_keys(selectlist, ArrowUp);
+    assert_true(selectlist.matches(':open'),
+      'Arrow up should open the listbox.');
+    assert_equals(selectlist.value, 'two',
+      'Arrow up should not change the selected value.');
+    await closeListbox();
+
+    await test_driver.send_keys(selectlist, ArrowRight);
+    assert_true(selectlist.matches(':open'),
+      'Arrow right should open the listbox.');
+    assert_equals(selectlist.value, 'two',
+      'Arrow right should not change the selected value.');
+    await closeListbox();
+
+    await test_driver.send_keys(selectlist, ArrowDown);
+    assert_true(selectlist.matches(':open'),
+      'Arrow down should open the listbox.');
+    assert_equals(selectlist.value, 'two',
+      'Arrow down should not change the selected value.');
+  }, `${id}: When the listbox is closed, all arrow keys should open the listbox.`);
+
+  promise_test(async t => {
+    addCloseCleanup(t);
+
+    // TODO(http://crbug.com/1350299): When focus for custom buttons is fixed,
+    // then we shouldn't need to explicitly use the custom button like this
+    // anymore.
+    const customButton = selectlist.querySelector('button');
+    if (customButton) {
+      await test_driver.send_keys(customButton, Enter);
+    } else {
+      await test_driver.send_keys(selectlist, Enter);
+    }
+    assert_false(selectlist.matches(':open'),
+      'Enter should not open the listbox when outside a form.');
+
+    form.appendChild(selectlist);
+    let formWasSubmitted = false;
+    form.addEventListener('submit', event => {
+      event.preventDefault();
+      formWasSubmitted = true;
+    }, {once: true});
+    if (customButton) {
+      await test_driver.send_keys(customButton, Enter);
+    } else {
+      await test_driver.send_keys(selectlist, Enter);
+    }
+    assert_true(formWasSubmitted,
+      'Enter should submit the form when the listbox is closed.');
+    assert_false(selectlist.matches(':open'),
+      'Enter should not open the listbox when it is in a form.');
+  }, `${id}: When the listbox is closed, the enter key should submit the form or do nothing.`);
+
+  promise_test(async t => {
+    addCloseCleanup(t);
+    const optionOne = selectlist.querySelector('.one');
+    const optionTwo = selectlist.querySelector('.two');
+    const optionThree = selectlist.querySelector('.three');
+
+    selectlist.value = 'two';
+    await test_driver.click(selectlist);
+    assert_true(selectlist.matches(':open'),
+      'The selectlist should open when clicked.');
+    assert_equals(document.activeElement, optionTwo,
+      'The selected option should receive initial focus.');
+
+    await test_driver.send_keys(document.activeElement, ArrowDown);
+    assert_equals(document.activeElement, optionThree,
+      'The next option should receive focus when the down arrow key is pressed.');
+    assert_equals(selectlist.value, 'two',
+      'The selectlists value should not change when focusing another option.');
+
+    await test_driver.send_keys(document.activeElement, ArrowUp);
+    assert_equals(document.activeElement, optionTwo,
+      'The previous option should receive focus when the up arrow key is pressed.');
+    assert_equals(selectlist.value, 'two',
+      'The selectlists value should not change when focusing another option.');
+
+    await test_driver.send_keys(document.activeElement, ArrowUp);
+    assert_equals(document.activeElement, optionOne,
+      'The first option should be selected.');
+    assert_equals(selectlist.value, 'two',
+      'The selectlists value should not change when focusing another option.');
+
+    await test_driver.send_keys(document.activeElement, Enter);
+    assert_false(selectlist.matches(':open'),
+      'The listbox should be closed after pressing enter.');
+    assert_equals(selectlist.value, 'one',
+      'The selectlists value should change after pressing enter on a different option.');
+  }, `${id}: When the listbox is open, the enter key should commit the selected option.`);
+}
+</script>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard.tentative.html
index 38c5fd7dc4e..5d1c65e9413 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-keyboard.tentative.html
@@ -6,10 +6,10 @@
 <script src="/resources/testdriver-actions.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
   <selectlist id="selectList0">
-    <div id="selectList0-button0" slot="button" behavior="button" tabindex="0">button</div>
-    <option>one</option>
-    <option>two</option>
-    <option>three</option>
+    <button id="selectList0-button0" type=selectlist>button</button>
+    <option class=one>one</option>
+    <option class=two>two</option>
+    <option class=three>three</option>
   </selectlist>
 
   <selectlist id="selectList1">
@@ -17,17 +17,17 @@
   </selectlist>
 
   <selectlist id="selectList2" disabled>
-    <div id="selectList2-button0" slot="button" behavior="button" tabindex="0">button</div>
+    <button id="selectList2-button0" type=selectlist>button</button>
     <option disabled>one</option>
     <option>two</option>
     <option>three</option>
   </selectlist>
 
   <selectlist id="selectList3">
-    <div id="selectList3-button0" slot="button" behavior="button" tabindex="0">button</div>
-    <option>one</option>
+    <button id="selectList3-button0" type=selectlist>button</button>
+    <option class=one>one</option>
     <option disabled>two</option>
-    <option>three</option>
+    <option class=three>three</option>
   </selectlist>
 <script>
 // See https://w3c.github.io/webdriver/#keyboard-actions
@@ -52,31 +52,45 @@ promise_test(async t => {
   assert_false(selectList.open, "selectlist should not be initially open");
 
   await test_driver.send_keys(button, KEY_CODE_MAP.Enter);
-  assert_true(selectList.open, "Enter key should open selectlist");
+  assert_false(selectList.open, "Enter key shouldn't open selectlist");
+  await test_driver.send_keys(button, KEY_CODE_MAP.Space);
+  assert_true(selectList.open, "Space key should open selectlist");
   assert_equals(selectList.value, "one");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowDown);
-  assert_equals(selectList.value, "two", "Down arrow should go to next option");
+  assert_equals(document.activeElement, selectList.querySelector('.two'),
+    "Down arrow should focus the next option.");
+  assert_equals(selectList.value, "one", "Down arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowDown);
-  assert_equals(selectList.value, "three", "Down arrow should go to next option");
+  assert_equals(document.activeElement, selectList.querySelector('.three'),
+    "Down arrow should focus the next option.");
+  assert_equals(selectList.value, "one", "Down arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowDown);
-  assert_equals(selectList.value, "three", "Down arrow should do nothing if already at the last option");
+  assert_equals(document.activeElement, selectList.querySelector('.three'),
+    "Down arrow should do nothing if already at the last option.");
+  assert_equals(selectList.value, "one", "Down arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowUp);
-  assert_equals(selectList.value, "two", "Up arrow should go to the previous option");
+  assert_equals(document.activeElement, selectList.querySelector('.two'),
+    "Up arrow should focus the previous option.");
+  assert_equals(selectList.value, "one", "Up arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowUp);
-  assert_equals(selectList.value, "one", "Up arrow should go to the previous option");
+  assert_equals(document.activeElement, selectList.querySelector('.one'),
+    "Up arrow should focus the previous option.");
+  assert_equals(selectList.value, "one", "Up arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.ArrowUp);
-  assert_equals(selectList.value, "one", "Up arrow should do nothing if already at the first option");
+  assert_equals(document.activeElement, selectList.querySelector('.one'),
+    "Up arrow should do nothing if already at the first option.");
+  assert_equals(selectList.value, "one", "Up arrow should not commit the newly focused option.");
 
   await test_driver.send_keys(selectList, KEY_CODE_MAP.Enter);
   assert_false(selectList.open, "Enter key should close selectlist");
 
-  await test_driver.send_keys(selectList, " ");
+  await test_driver.send_keys(button, KEY_CODE_MAP.Space);
   assert_true(selectList.open, "Space key should open selectlist");
 
   // This behavior is suspicious (since Space key can open the selectlist),
@@ -111,13 +125,18 @@ promise_test(async t => {
   assert_false(selectList3.open, "selectlist should not be initially open");
 
   await test_driver.send_keys(selectList3Button, KEY_CODE_MAP.Enter);
-  assert_true(selectList3.open, "Enter key should open selectlist");
+  assert_false(selectList3.open, "Enter key shouldn't open selectlist");
+
+  await test_driver.send_keys(selectList3Button, KEY_CODE_MAP.Space);
+  assert_true(selectList3.open, "Space key should open selectlist");
   assert_equals(selectList3.value, "one");
 
   await test_driver.send_keys(selectList3, KEY_CODE_MAP.ArrowDown);
-  assert_equals(selectList3.value, "three", "Down arrow should go to next non-disabled option");
+  assert_equals(document.activeElement, selectList3.querySelector('.three'),
+    "Down arrow should go to next non-disabled option");
 
   await test_driver.send_keys(selectList3, KEY_CODE_MAP.ArrowUp);
-  assert_equals(selectList3.value, "one", "Up arrow should go to the previous non-disabled option");
+  assert_equals(document.activeElement, selectList3.querySelector('.one'),
+    "Up arrow should go to the previous non-disabled option");
 }, "Validate Enter, Up/Down Arrow keyboard accessibility support for disabled <selectlist>");
 </script>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-nested.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-nested.tentative.html
index 1d15fb90160..c29413f180c 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-nested.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-nested.tentative.html
@@ -30,10 +30,10 @@
 <selectlist id="selectList2">
   <div slot="button">
     <selectlist id="nested2">
-      <div slot="button" behavior="button" id="selectList2-button0">button0</div>
+      <button type=selectlist id="selectList2-button0">button0</button>
       <option id="nested2-option1">one</option>
     </selectlist>
-    <div behavior="button" id="selectList2-button1">button1</div>
+    <button type=selectlist id="selectList2-button1">button1</button>
   </div>
   <option>two</option>
 </selectlist>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-parts-structure.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-parts-structure.tentative.html
index f60ba65be17..104ae841f71 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-parts-structure.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-parts-structure.tentative.html
@@ -18,23 +18,22 @@
 </selectlist>
 
 <selectlist id="selectList1">
-  <div popover slot="listbox" behavior="listbox" id="selectList1-popover">
-    <div behavior="button" id="selectList1-button">
+  <listbox id="selectList1-popover">
+    <button type=selectlist id="selectList1-button">
       Custom button
-    </div>
+    </button>
     <option>one</option>
     <option id="selectList1-child2">two</option>
-  </div>
+  </listbox>
 </selectlist>
 
 <selectlist id="selectList2">
-  <div slot="button" behavior="button" id="selectList2-button">
+  <button type=selectlist id="selectList2-button">
     Custom button
-    <div popover behavior="listbox" id="selectList2-popover">
-      <option>one</option>
-      <option id="selectList2-child2">two</option>
-    </div>
-  </div>
+    <listbox id="selectList2-popover">
+      Custom listbox
+    </listbox>
+  </button>
   <option>three</option>
   <div>
     This is some text.
@@ -45,13 +44,13 @@
 
 <selectlist id="selectList3">
   <div slot="button" id="selectList3-button-slot">
-    <div behavior="button" id="selectList3-button0">button0</div>
+    <button type=selectlist id="selectList3-button0">button0</button>
   </div>
   <option>one</option>
 </selectlist>
 
 <selectlist id="selectList4">
-  <div slot="button" behavior="button" id="selectList4-button0">button0</div>
+  <button type=selectlist id="selectList4-button0">button0</button>
   <div slot="listbox" id="selectList4-listbox-slot">
     <div popover behavior="listbox" id="selectList4-listbox0">
       <option>one</option>
@@ -62,7 +61,7 @@
 
 <selectlist id="selectList5">
   <div slot="button" id="selectList5-button-slot">
-    <div behavior="button" id="selectList5-button0">button0</div>
+    <button type=selectlist id="selectList5-button0">button0</button>
     <div behavior="selected-value" id="selectList5-selectedValue0"></div>
   </div>
   <option>one</option>
@@ -78,7 +77,7 @@
 <!-- No associated JS test -- just don't crash when parsing! -->
 <selectlist id="selectList7">
   <div slot="listbox"></div>
-  <div slot="button" behavior="button"></div>
+  <button type=selectlist></button>
 </selectlist>
 
 <!-- No associated JS test -- just don't crash when parsing! -->
@@ -96,12 +95,6 @@
   </div>
 </selectlist>
 
-<selectlist id="selectList10">
-  <option slot="button" id="selectList10-slottedOption">Test 10</option>
-  <option>one</option>
-  <option id="selectList10-option2">two</option>
-</selectlist>
-
 <selectlist id="selectList11">
   <div popover slot="listbox" behavior="listbox">
     <option>one</option>
@@ -110,24 +103,20 @@
 </selectlist>
 
 <selectlist id="selectList12">
-  <div slot="button" id="selectList12-button-slot">
-    <div behavior="button" id="selectList12-button0">button0</div>
-  </div>
-  <div slot="listbox" id="selectList12-listbox-slot">
-    <div popover behavior="listbox" id="selectList12-originalListbox">
-      <option id="selectList12-option1">one</option>
-      <option>two</option>
-    </div>
-  </div>
+  <button type=selectlist id="selectList12-button0">button0</button>
+  <listbox id="selectList12-listbox">
+    <option id="selectList12-option1">one</option>
+    <option>two</option>
+  </listbox>
 </selectlist>
 
 <selectlist id="selectList13">
   <div slot="button" id="selectList12-button-slot">
     <div id="selectList13-removeContent-button">
-      <div behavior="button" id="selectList13-button0">button0</div>
-      <div behavior="button" id="selectList13-button1">button1</div>
+      <button type=selectlist id="selectList13-button0">button0</button>
+      <button type=selectlist id="selectList13-button1">button1</button>
     </div>
-    <div behavior="button" id="selectList13-button2">button2</div>
+    <button type=selectlist id="selectList13-button2">button2</button>
   </div>
   <div slot="listbox" id="selectList13-listbox-slot">
     <div id="selectList13-removeContent-listbox">
@@ -144,7 +133,7 @@
 </selectlist>
 
 <selectlist id="selectList14">
-  <div slot="button" behavior="button" id="selectList14-button0">button0</div>
+  <button type=selectlist id="selectList14-button0">button0</button>
   <option>one</option>
   <option id="selectList14-option2">two</option>
 </selectlist>
@@ -157,7 +146,7 @@
 <selectlist id="selectList16">
   <div slot="button">
     <div id="selectList16-div0">
-      <div behavior="button" id="selectList16-button0">button</div>
+      <button type=selectlist id="selectList16-button0">button</button>
     </div>
   </div>
   <option>one</option>
@@ -231,7 +220,6 @@
     assert_false(selectList2Popover.matches(':popover-open'), "Clicking a button part should not show an invalid listbox part");
 
     assert_equals(selectList2.value, "three");
-    await clickOn(selectList2Button);
     await clickOn(selectList2Child4);
     assert_equals(selectList2.value, "four", "Clicking an <option> that is a descendant of a valid listbox part should update the value");
   }, "To receive listbox part controller code, an element labeled as a listbox must not be a descendant of the button part in a flat tree traversal");
@@ -335,28 +323,6 @@ promise_test(async () => {
     assert_equals(selectList.value, "four", "New options should get controller code after listbox switch");
     }, "Ensure that option controller code is updated when listbox changes");
 
-  promise_test(async () => {
-    const selectList = document.getElementById("selectList10");
-    const selectList10SlottedOption = document.getElementById("selectList10-slottedOption");
-
-    await clickOn(selectList10SlottedOption);
-    assert_false(selectList.open, "Controller code not applied due to part attribute missing");
-    selectList10SlottedOption.setAttribute("behavior", "button");
-    await clickOn(selectList10SlottedOption);
-    assert_true(selectList.open);
-
-    const option2 = document.getElementById("selectList10-option2");
-    await clickOn(option2);
-    assert_equals(selectList.value, "two");
-    assert_false(selectList.open);
-
-    selectList10SlottedOption.slot = "";
-    await clickOn(selectList);
-    assert_true(selectList.open, "Default button part should be used");
-    await clickOn(selectList10SlottedOption);
-    assert_equals(selectList.value, "Test 10");
-  }, "Ensure that controller code is applied after updating the slot attribute");
-
   promise_test(async () => {
     const selectList = document.getElementById("selectList11");
     const selectList11Button= document.getElementById("selectList11-button");
@@ -371,39 +337,38 @@ promise_test(async () => {
 
   promise_test(async () => {
     const selectList = document.getElementById("selectList12");
-    const originalListbox = document.getElementById("selectList12-originalListbox");
+    const originalListbox = document.getElementById("selectList12-listbox");
     assert_equals(selectList.value, "one", "Initial value should be the first option");
 
-    const selectListButtonSlot = document.getElementById("selectList12-button-slot");
     const selectListButton0 = document.getElementById("selectList12-button0");
     const selectListOption1 = document.getElementById("selectList12-option1");
 
     assert_false(selectList.open);
-    let button1 = document.createElement("div");
+    let button1 = document.createElement("button");
     button1.innerText = "button1";
-    button1.setAttribute("behavior", "button");
-    selectListButtonSlot.insertBefore(button1, selectListButton0);
+    button1.setAttribute("type", "selectlist");
+    selectList.insertBefore(button1, selectListButton0);
     button1.click();
     assert_true(selectList.open, "Controller code should be applied to the new first button in document order");
     await clickOn(selectListOption1);
-    assert_false(selectList.open);
+    assert_false(selectList.open, "listbox should close after clicking option1.");
     selectListButton0.click();
-    assert_false(selectList.open);
+    assert_true(selectList.open, "listbox should open after clicking button0.");
+    selectListButton0.click();
+    assert_false(selectList.open, "listbox should close after clicking button0 again.");
 
-    let button2 = document.createElement("div");
+    let button2 = document.createElement("button");
     button2.innerText = "button2";
-    selectListButtonSlot.insertBefore(button2, button1);
+    selectList.insertBefore(button2, button1);
     button2.click();
-    assert_false(selectList.open, "Controller code should not be applied to button2 since it doesn't have behavior attribute set");
-    button2.setAttribute("behavior", "button");
+    assert_false(selectList.open, "Controller code should not be applied to button2 since it doesn't have type=selectlist.");
+    button2.setAttribute("type", "selectlist");
     button2.click();
     assert_true(selectList.open, "Controller code should be applied to the new button part");
     await clickOn(selectListOption1);
     assert_false(selectList.open);
 
-    let newListbox = document.createElement("div");
-    newListbox.setAttribute("popover", "auto");
-    newListbox.setAttribute("behavior", "listbox");
+    let newListbox = document.createElement("listbox");
     let newOption = document.createElement("option");
     newOption.innerText = "three";
     newListbox.appendChild(newOption);
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position-with-zoom.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position-with-zoom.tentative.html
index 2f61af1a11f..692eed7caae 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position-with-zoom.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover-position-with-zoom.tentative.html
@@ -47,40 +47,40 @@
 </style>
 
 <selectlist id="selectList0">
-  <div slot="button" behavior="button" id="selectList0-button">Custom bottom left</div>
-  <div popover slot="listbox" behavior="listbox" id="selectList0-popover">
+  <button type=selectlist id="selectList0-button">Custom bottom left</button>
+  <listbox id="selectList0-popover">
     <option>bottom left</option>
     <option>two</option>
     <option>three</option>
-  </div>
+  </listbox>
 </selectlist>
 <br>
 
 <selectlist id="selectList1">
-  <div slot="button" behavior="button" id="selectList1-button">Custom top left</div>
-  <div popover slot="listbox" behavior="listbox" id="selectList1-popover">
+  <button type=selectlist id="selectList1-button">Custom top left</button>
+  <listbox id="selectList1-popover">
     <option>top left</option>
     <option>two</option>
     <option>three</option>
-  </div>
+  </listbox>
 </selectlist>
 
 <selectlist id="selectList2">
-  <div slot="button" behavior="button" id="selectList2-button">Custom bottom right</div>
-  <div popover slot="listbox" behavior="listbox" id="selectList2-popover">
+  <button type=selectlist id="selectList2-button">Custom bottom right</button>
+  <listbox id="selectList2-popover">
     <option>bottom right</option>
     <option>two</option>
     <option>three</option>
-  </div>
+  </listbox>
 </selectlist>
 
 <selectlist id="selectList3">
-  <div slot="button" behavior="button" id="selectList3-button">Custom top right</div>
-  <div popover slot="listbox" behavior="listbox" id="selectList3-popover">
+  <button type=selectlist id="selectList3-button">Custom top right</button>
+  <listbox id="selectList3-popover">
     <option>top right</option>
     <option>two</option>
     <option>three</option>
-  </div>
+  </listbox>
 </selectlist>
 
 <script>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover.tentative.html
index 2187226adbf..a26d0266496 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-popover.tentative.html
@@ -14,14 +14,14 @@
 </selectlist>
 
 <selectlist id="selectList1">
-  <div slot="button" behavior="button" class="button">
+  <button type=selectlist class=button>
     Custom button
-  </div>
-  <div popover slot="listbox" behavior="listbox">
+  </button>
+  <listbox>
     <option>one</option>
     <option class="child2">two</option>
     <option class="child3">three</option>
-  </div>
+  </listbox>
 </selectlist>
 
 <selectlist id="selectList2">
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-pseudo-open-closed.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-pseudo-open-closed.tentative.html
index 3184fe786c1..1d5a082c033 100644
--- a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-pseudo-open-closed.tentative.html
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/selectlist-pseudo-open-closed.tentative.html
@@ -6,7 +6,7 @@
 <script src="/resources/testharnessreport.js"></script>
 
 <selectlist id=myselectlist>
-  <button id=custombutton slot=button behavior=button>button</button>
+  <button type=selectlist id=custombutton>button</button>
   <option>one</option>
   <option>two</option>
 </selectlist>
@@ -28,7 +28,7 @@ test(() => {
 </script>
 
 <selectlist id=selectlistinvalidation>
-  <button slot=button behavior=button>button</button>
+  <button type=selectlist>button</button>
   <option>one</option>
   <option>two</option>
 </selectlist>
diff --git a/tests/wpt/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html
new file mode 100644
index 00000000000..1706ed34cc6
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/forms/the-selectlist-element/tab-closes-listbox.tentative.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/openui/open-ui/issues/599">
+<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1359089">
+<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>
+
+<selectlist id=defaultlistbox>
+  <option>one</option>
+  <option>two</option>
+</selectlist>
+
+<selectlist id=customlistbox>
+  <listbox>
+    <option>one</option>
+    <option>two</option>
+  </listbox>
+</selectlist>
+
+<script>
+const tabKey = '\uE004';
+
+document.querySelectorAll('selectlist').forEach(selectlist => {
+  promise_test(async () => {
+    selectlist.focus();
+    await test_driver.send_keys(selectlist, ' ');
+    assert_true(selectlist.open, 'Listbox should be open after pressing space.');
+
+    selectlist.addEventListener('keydown', event => {
+      if (event.key === 'Tab') {
+        event.preventDefault();
+      }
+    }, {once: true});
+    await test_driver.send_keys(document.activeElement, tabKey);
+    assert_true(selectlist.open, 'Listbox should stay open when the tab keydown is preventDefaulted.');
+
+    await test_driver.send_keys(document.activeElement, tabKey);
+    assert_false(selectlist.open, 'Listbox should close after pressing the tab key.');
+  }, `${selectlist.id}: Pressing tab should close the listbox.`);
+});
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/idlharness.tentative.html b/tests/wpt/tests/html/semantics/invokers/idlharness.tentative.html
new file mode 100644
index 00000000000..b215f65813a
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/idlharness.tentative.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+
+<script>
+  idl_test(["invokers.tentative"], ["html", "dom"], (idl_array) => {
+    idl_array.add_objects({
+      InvokeEvent: ['new InvokeEvent("invoke")'],
+    });
+  });
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/invokeelement-interface.tentative.html b/tests/wpt/tests/html/semantics/invokers/invokeelement-interface.tentative.html
new file mode 100644
index 00000000000..69cfd80fe56
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/invokeelement-interface.tentative.html
@@ -0,0 +1,92 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<button id="invoker" invoketarget="invokee"></button>
+<div id="invokee"></div>
+
+<script>
+  test(function () {
+    assert_equals(invoker.invokeTargetElement, invokee);
+  }, "invokeTargetElement reflects invokee HTML element");
+
+  test(function () {
+    const div = document.body.appendChild(document.createElement("div"));
+    invoker.invokeTargetElement = div;
+    assert_equals(invoker.invokeTargetElement, div);
+    assert_equals(invoker.getAttribute('invoketarget'), '');
+    assert_false(invoker.hasAttribute('invokeaction'));
+  }, "invokeTargetElement reflects set value");
+
+  test(function () {
+    const host = document.body.appendChild(document.createElement("div"));
+    const shadow = host.attachShadow({ mode: "open" });
+    const button = shadow.appendChild(document.createElement("button"));
+    button.invokeTargetElement = invokee;
+    assert_equals(button.invokeTargetElement, invokee);
+    assert_equals(invoker.getAttribute('invoketarget'), '');
+    assert_false(invoker.hasAttribute('invokeaction'));
+  }, "invokeTargetElement reflects set value across shadow root into light dom");
+
+  test(function () {
+    const host = document.body.appendChild(document.createElement("div"));
+    const shadow = host.attachShadow({ mode: "open" });
+    const div = shadow.appendChild(document.createElement("div"));
+    invoker.invokeTargetElement = div;
+    assert_equals(invoker.invokeTargetElement, null);
+    assert_equals(invoker.getAttribute('invoketarget'), '');
+    assert_false(invoker.hasAttribute('invokeaction'));
+  }, "invokeTargetElement does not reflect set value inside shadowroot");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        invoker.invokeTargetElement = {};
+      },
+      "invokeTargetElement attribute must be an instance of Element",
+    );
+  }, "invokeTargetElement throws error on assignment of non Element");
+
+  test(function () {
+    assert_false(invoker.hasAttribute('invokeaction'));
+    assert_equals(invoker.invokeAction, "auto");
+  }, "invokeAction reflects 'auto' when attribute not present");
+
+  test(function () {
+    invoker.setAttribute("invokeaction", "");
+    assert_equals(invoker.getAttribute("invokeaction"), "");
+    assert_equals(invoker.invokeAction, "auto");
+  }, "invokeAction reflects 'auto' when attribute empty");
+
+  test(function () {
+    invoker.invokeAction = "fooBarBaz";
+    assert_equals(invoker.invokeAction, "fooBarBaz");
+  }, "invokeAction reflects same casing");
+
+  test(function () {
+    invoker.invokeAction = "";
+    assert_equals(invoker.getAttribute("invokeaction"), "");
+    assert_equals(invoker.invokeAction, "auto");
+  }, "invokeAction reflects 'auto' when attribute empty 2");
+
+  test(function () {
+    invoker.invokeAction = [1, 2, 3];
+    assert_equals(invoker.getAttribute("invokeaction"), "1,2,3");
+    assert_equals(invoker.invokeAction, "1,2,3");
+  }, "invokeAction reflects tostring value");
+
+  test(function () {
+    invoker.invokeAction = [];
+    assert_equals(invoker.getAttribute("invokeaction"), "");
+    assert_equals(invoker.invokeAction, "auto");
+  }, "invokeAction reflects 'auto' when attribute set to []");
+
+  test(function () {
+    invoker.invokeAction = {};
+    assert_equals(invoker.invokeAction, "[object Object]");
+  }, "invokeAction reflects tostring value 2");
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/invokeevent-dispatch-shadow.tentative.html b/tests/wpt/tests/html/semantics/invokers/invokeevent-dispatch-shadow.tentative.html
new file mode 100644
index 00000000000..84337d57239
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/invokeevent-dispatch-shadow.tentative.html
@@ -0,0 +1,104 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/invoker-utils.js"></script>
+
+<div id="div"></div>
+<button id="button"></button>
+
+<script>
+  test(function () {
+    const host = document.createElement("div");
+    const child = host.appendChild(document.createElement("p"));
+    const shadow = host.attachShadow({ mode: "closed" });
+    const slot = shadow.appendChild(document.createElement("slot"));
+    let childEvent = null;
+    let childEventTarget = null;
+    let childEventInvoker = null;
+    let hostEvent = null;
+    let hostEventTarget = null;
+    let hostEventInvoker = null;
+    slot.addEventListener(
+      "invoke",
+      (e) => {
+        childEvent = e;
+        childEventTarget = e.target;
+        childEventInvoker = e.invoker;
+      },
+      { once: true },
+    );
+    host.addEventListener(
+      "invoke",
+      (e) => {
+        hostEvent = e;
+        hostEventTarget = e.target;
+        hostEventInvoker = e.invoker;
+      },
+      { once: true },
+    );
+    const event = new InvokeEvent("invoke", {
+      bubbles: true,
+      invoker: slot,
+      composed: true,
+    });
+    slot.dispatchEvent(event);
+    assert_true(childEvent instanceof InvokeEvent, "slot saw invoke event");
+    assert_equals(
+      childEventTarget,
+      slot,
+      "target is child inside shadow boundary",
+    );
+    assert_equals(
+      childEventInvoker,
+      slot,
+      "invoker is child inside shadow boundary",
+    );
+    assert_equals(
+      hostEvent,
+      childEvent,
+      "event dispatch propagates across shadow boundary",
+    );
+    assert_equals(
+      hostEventTarget,
+      host,
+      "target is retargeted to shadowroot host",
+    );
+    assert_equals(
+      hostEventInvoker,
+      host,
+      "invoker is retargeted to shadowroot host",
+    );
+  }, "InvokeEvent propagates across shadow boundaries retargeting invoker");
+
+  test(function (t) {
+    const host = document.createElement("div");
+    document.body.append(host);
+    t.add_cleanup(() => host.remove());
+    const shadow = host.attachShadow({ mode: "open" });
+    const button = shadow.appendChild(document.createElement("button"));
+    const invokee = host.appendChild(document.createElement("div"));
+    button.invokeTargetElement = invokee;
+    let event = null;
+    let eventTarget = null;
+    let eventInvoker = null;
+    invokee.addEventListener(
+      "invoke",
+      (e) => {
+        event = e;
+        eventTarget = e.target;
+        eventInvoker = e.invoker;
+      },
+      { once: true },
+    );
+    button.click();
+    assert_true(event instanceof InvokeEvent);
+    assert_equals(eventTarget, invokee, "target is invokee");
+    assert_equals(eventInvoker, host, "invoker is host");
+  }, "cross shadow InvokeEvent retargets invoker to host element");
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/invokeevent-interface.tentative.html b/tests/wpt/tests/html/semantics/invokers/invokeevent-interface.tentative.html
new file mode 100644
index 00000000000..007c97e6fe5
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/invokeevent-interface.tentative.html
@@ -0,0 +1,161 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/invoker-utils.js"></script>
+
+<div id="div"></div>
+<button id="button"></button>
+
+<script>
+  test(function () {
+    const event = new InvokeEvent("test");
+    assert_equals(event.action, "auto");
+    assert_readonly(event, "action", "readonly attribute value");
+  }, "action is a readonly defaulting to 'auto'");
+
+  test(function () {
+    const event = new InvokeEvent("test");
+    assert_equals(event.invoker, null);
+    assert_readonly(event, "invoker", "readonly attribute value");
+  }, "invoker is readonly defaulting to null");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: "sAmPle" });
+    assert_equals(event.action, "sAmPle");
+  }, "action reflects initialized attribute");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: undefined });
+    assert_equals(event.action, "auto");
+  }, "action set to undefined");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: null });
+    assert_equals(event.action, "null");
+  }, "action set to null");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: false });
+    assert_equals(event.action, "false");
+  }, "action set to false");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: true });
+    assert_equals(event.action, "true");
+  }, "action set to true");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: 0.5 });
+    assert_equals(event.action, "0.5");
+  }, "action set to a number");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: [] });
+    assert_equals(event.action, "auto");
+  }, "action set to []");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: [1, 2, 3] });
+    assert_equals(event.action, "1,2,3");
+  }, "action set to [1, 2, 3]");
+
+  test(function () {
+    const event = new InvokeEvent("test", { action: { sample: 0.5 } });
+    assert_equals(event.action, "[object Object]");
+  }, "action set to an object");
+
+  test(function () {
+    const event = new InvokeEvent("test", {
+      action: {
+        valueOf: function () {
+          return "sample";
+        },
+      },
+    });
+    assert_equals(event.action, "[object Object]");
+  }, "action set to an object with a valueOf function");
+
+  test(function () {
+    const eventInit = { action: "sample", invoker: document.body };
+    const event = new InvokeEvent("test", eventInit);
+    assert_equals(event.action, "sample");
+    assert_equals(event.invoker, document.body);
+  }, "InvokeEventInit properties set value");
+
+  test(function () {
+    const eventInit = {
+      action: "open",
+      invoker: document.getElementById("div"),
+    };
+    const event = new InvokeEvent("beforetoggle", eventInit);
+    assert_equals(event.action, "open");
+    assert_equals(event.invoker, document.getElementById("div"));
+  }, "InvokeEventInit properties set value 2");
+
+  test(function () {
+    const eventInit = {
+      action: "closed",
+      invoker: document.getElementById("button"),
+    };
+    const event = new InvokeEvent("toggle", eventInit);
+    assert_equals(event.action, "closed");
+    assert_equals(event.invoker, document.getElementById("button"));
+  }, "InvokeEventInit properties set value 3");
+
+  test(function () {
+    const event = new InvokeEvent("test", { invoker: undefined });
+    assert_equals(event.invoker, null);
+  }, "invoker set to undefined");
+
+  test(function () {
+    const event = new InvokeEvent("test", { invoker: null });
+    assert_equals(event.invoker, null);
+  }, "invoker set to null");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        new InvokeEvent("test", { invoker: false });
+      },
+      "invoker is not an object",
+    );
+  }, "invoker set to false");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        const event = new InvokeEvent("test", { invoker: true });
+      },
+      "invoker is not an object",
+    );
+  }, "invoker set to true");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        const event = new InvokeEvent("test", { invoker: {} });
+      },
+      "invoker is not an object",
+    );
+  }, "invoker set to {}");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        const eventInit = { action: "closed", invoker: new XMLHttpRequest() };
+        const event = new InvokeEvent("toggle", eventInit);
+      },
+      "invoker is not an Element",
+    );
+  }, "invoker set to non-Element EventTarget");
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html b/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
new file mode 100644
index 00000000000..16922f97466
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
@@ -0,0 +1,93 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com" />
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/invoker-utils.js"></script>
+
+<div id="invokee"></div>
+<button id="invokerbutton" invoketarget="invokee"></button>
+
+<script>
+  promise_test(async function (t) {
+    let event = null;
+    invokee.addEventListener("invoke", (e) => (event = e), { once: true });
+    await clickOn(invokerbutton);
+    assert_true(event instanceof InvokeEvent, "event is InvokeEvent");
+    assert_equals(event.type, "invoke", "type");
+    assert_equals(event.bubbles, false, "bubbles");
+    assert_equals(event.composed, false, "composed");
+    assert_equals(event.isTrusted, true, "isTrusted");
+    assert_equals(event.action, "auto", "action");
+    assert_equals(event.target, invokee, "target");
+    assert_equals(event.invoker, invokerbutton, "invoker");
+  }, "event dispatches on click");
+
+  promise_test(async function (t) {
+    let event = null;
+    invokee.addEventListener("invoke", (e) => (event = e), { once: true });
+    invokerbutton.invokeAction = "fooBar";
+    await clickOn(invokerbutton);
+    assert_true(event instanceof InvokeEvent, "event is InvokeEvent");
+    assert_equals(event.type, "invoke", "type");
+    assert_equals(event.bubbles, false, "bubbles");
+    assert_equals(event.composed, false, "composed");
+    assert_equals(event.isTrusted, true, "isTrusted");
+    assert_equals(event.action, "fooBar", "action");
+    assert_equals(event.target, invokee, "target");
+    assert_equals(event.invoker, invokerbutton, "invoker");
+  }, "event action is set to invokeAction");
+
+  promise_test(async function (t) {
+    let event = null;
+    invokee.addEventListener("invoke", (e) => (event = e), { once: true });
+    invokerbutton.setAttribute("invokeaction", "BaRbAz");
+    await clickOn(invokerbutton);
+    assert_true(event instanceof InvokeEvent, "event is InvokeEvent");
+    assert_equals(event.type, "invoke", "type");
+    assert_equals(event.bubbles, false, "bubbles");
+    assert_equals(event.composed, false, "composed");
+    assert_equals(event.isTrusted, true, "isTrusted");
+    assert_equals(event.action, "BaRbAz", "action");
+    assert_equals(event.target, invokee, "target");
+    assert_equals(event.invoker, invokerbutton, "invoker");
+  }, "event action is set to invokeaction attribute");
+
+  promise_test(async function (t) {
+    let called = false;
+    invokerbutton.addEventListener(
+      "click",
+      (event) => {
+        event.preventDefault();
+      },
+      { once: true },
+    );
+    invokee.addEventListener(
+      "invoke",
+      (event) => {
+        called = true;
+      },
+      { once: true },
+    );
+    await clickOn(invokerbutton);
+    assert_false(called, "event was not called");
+  }, "event does not dispatch if click:preventDefault is called");
+
+  promise_test(async function (t) {
+    let called = false;
+    invokee.addEventListener(
+      "invoke",
+      (event) => {
+        called = true;
+      },
+      { once: true },
+    );
+    invokerbutton.setAttribute("disabled", "");
+    await clickOn(invokerbutton);
+    assert_false(called, "event was not called");
+  }, "event does not dispatch if invoker is disabled");
+</script>
diff --git a/tests/wpt/tests/html/semantics/invokers/resources/invoker-utils.js b/tests/wpt/tests/html/semantics/invokers/resources/invoker-utils.js
new file mode 100644
index 00000000000..317945502d4
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/invokers/resources/invoker-utils.js
@@ -0,0 +1,12 @@
+function waitForRender() {
+  return new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
+}
+async function clickOn(element) {
+  const actions = new test_driver.Actions();
+  await waitForRender();
+  await actions.pointerMove(0, 0, {origin: element})
+      .pointerDown({button: actions.ButtonType.LEFT})
+      .pointerUp({button: actions.ButtonType.LEFT})
+      .send();
+  await waitForRender();
+}
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
new file mode 100644
index 00000000000..68473174eda
--- /dev/null
+++ b/tests/wpt/tests/html/semantics/popovers/popover-light-dismiss-flat-tree-nested.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Test that popover light dismiss uses the flat tree when nested shadow roots.</title>
+    <link rel="author" title="Luke Warlow" href="mailto:luke@warlow.dev">
+</head>
+<body>
+    <p>Test passes if the inner popover opens after clicking the inner toggle.</p>
+    <button popovertarget="outerPopover" popovertargetaction="toggle" id="outerPopoverToggle">Toggle</button>
+    <div id="outerPopover" popover>
+        <template shadowrootmode="open">
+            Outer
+            <button id="innerPopoverToggle">Toggle</button>
+            <div id="innerContainer">
+               <template shadowrootmode="open">
+                    <div id="innerPopover" popover>
+                        Inner
+                    </div>
+                </template>
+           </div>
+        </template>
+    </div>
+
+    <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 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");
+            innerPopoverToggle.onclick = () => {
+                innerPopover.togglePopover();
+            }
+
+            assert_false(outerPopover.matches(":popover-open"), "outer popover is initially hidden");
+            assert_false(innerPopover.matches(":popover-open"), "inner popover is initially hidden");
+
+            await clickOn(outerPopoverToggle);
+
+            assert_true(outerPopover.matches(":popover-open"), "outer popover is open after clicking the toggle");
+            assert_false(innerPopover.matches(":popover-open"), "inner popover is initially hidden");
+
+            await clickOn(innerPopoverToggle);
+
+            assert_true(outerPopover.matches(":popover-open"), "outer popover is not dismissed after clicking the second toggle");
+            assert_true(innerPopover.matches(":popover-open"), "inner popover is open after clicking the second toggle");
+        }, "Popover light dismiss uses the flat tree when nested shadow root");
+    </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/html/semantics/popovers/popover-top-layer-combinations.html b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-combinations.html
index 8a5d2df8e27..c6fae283874 100644
--- a/tests/wpt/tests/html/semantics/popovers/popover-top-layer-combinations.html
+++ b/tests/wpt/tests/html/semantics/popovers/popover-top-layer-combinations.html
@@ -135,7 +135,7 @@ window.onload = () => requestAnimationFrame(() => requestAnimationFrame(() => {
         // Popover fullscreen isn't visible by default, so explicitly add
         // display:block, so that calls to "clickOn" can succeed.
         ex.classList.add('visible');
-        await blessTopLayer(visible);
+        await blessTopLayer(ex);
         await ex.requestFullscreen();
       } else {
         assert_unreached('Not a dialog or fullscreen');
diff --git a/tests/wpt/tests/html/user-activation/propagation-sameorigin.html b/tests/wpt/tests/html/user-activation/propagation-sameorigin.html
index 61debbf948a..94d15c2d415 100644
--- a/tests/wpt/tests/html/user-activation/propagation-sameorigin.html
+++ b/tests/wpt/tests/html/user-activation/propagation-sameorigin.html
@@ -62,9 +62,11 @@
                 assert_false(msg.hasBeenActive);
             }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-report') {
+            // Siblings (same or cross origin) should not be activated per spec
+            // Spec issue discussing: https://github.com/whatwg/html/issues/9831
             test(() => {
-                assert_true(msg.isActive);
-                assert_true(msg.hasBeenActive);
+                assert_false(msg.isActive);
+                assert_false(msg.hasBeenActive);
             }, "Child1 frame final state");
         } else if (msg.type == 'child-sameorigin-report') {
             // This msg was triggered by a user click.
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html
new file mode 100644
index 00000000000..1debcafa3b5
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-encoding.tentative.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="windows-1252"> <!-- intentional to make sure the results are UTF-8 anyway -->
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/9538">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This was adapted from DOMParser-parseFromString-encoding.html -->
+
+<script>
+function assertEncoding(doc) {
+  assert_equals(doc.charset, "UTF-8", "document.charset");
+  assert_equals(doc.characterSet, "UTF-8", "document.characterSet");
+  assert_equals(doc.inputEncoding, "UTF-8", "document.characterSet");
+}
+
+setup(() => {
+  assert_equals(document.characterSet, "windows-1252", "the meta charset must be in effect, making the main document windows-1252");
+});
+
+test(() => {
+  const doc = Document.parseHTMLUnsafe('');
+  assertEncoding(doc);
+}, 'Parse empty string');
+
+test(() => {
+  const doc = Document.parseHTMLUnsafe(`<meta charset="latin2">`);
+  assertEncoding(doc);
+}, "meta charset latin2");
+
+test(() => {
+  const doc = Document.parseHTMLUnsafe(`<?xml version="1.0" encoding="latin2"?><x/>`);
+  assertEncoding(doc);
+}, "XML declaration");
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html
new file mode 100644
index 00000000000..cd092a60346
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-style-attribute.tentative.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from style_attribute_html.html -->
+<meta charset=utf-8>
+<title>Style attribute in HTML</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+
+var div;
+setup(function() {
+    var input = '<div style="color: red">Foo</div>';
+    var doc = Document.parseHTMLUnsafe(input);
+    div = doc.querySelector('div');
+});
+
+test(function() {
+    var style = div.style;
+    assert_equals(style.cssText, 'color: red;');
+    assert_equals(style.color, 'red');
+    assert_equals(div.getAttribute("style"), 'color: red',
+                  'Value of style attribute should match the string value that was set');
+}, 'Parsing of initial style attribute');
+
+test(function() {
+    var style = div.style;
+    div.setAttribute('style', 'color:: invalid');
+    assert_equals(style.cssText, '');
+    assert_equals(style.color, '');
+    assert_equals(div.getAttribute('style'), 'color:: invalid',
+                  'Value of style attribute should match the string value that was set');
+}, 'Parsing of invalid style attribute');
+
+test(function() {
+    var style = div.style;
+    div.setAttribute('style', 'color: green');
+    assert_equals(style.cssText, 'color: green;');
+    assert_equals(style.color, 'green');
+    assert_equals(div.getAttribute('style'), 'color: green',
+                  'Value of style attribute should match the string value that was set');
+}, 'Parsing of style attribute');
+
+test(function() {
+    var style = div.style;
+    style.backgroundColor = 'blue';
+    assert_equals(style.cssText, 'color: green; background-color: blue;',
+                  'Should not drop the existing style');
+    assert_equals(style.color, 'green',
+                  'Should not drop the existing style');
+    assert_equals(div.getAttribute('style'), 'color: green; background-color: blue;',
+                  'Should update style attribute');
+}, 'Update style.backgroundColor');
+
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html
new file mode 100644
index 00000000000..a8eab595116
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base-pushstate.tentative.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from DOMParser-parseFromString-url-base-pushstate.html -->
+<title>parseHTMLUnsafe test of how the document's URL is set (base, pushstate)</title>
+<base href="/fake/base-from-outer-frame">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base-pushstate.html" onload="window.resolveLoadPromise();"></iframe>
+
+<script>
+"use strict";
+history.pushState(null, "", "/fake/push-state-from-outer-frame");
+</script>
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html
new file mode 100644
index 00000000000..62b2c09aaec
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-base.tentative.html
@@ -0,0 +1,10 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This was adapted from DOMParser-parseFromString-url-base.html -->
+<title>parseHTMLUnsafe test of how the document's URL is set (base, no pushstate)</title>
+<base href="/fake/base-from-outer-frame">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base.html" onload="window.resolveLoadPromise();"></iframe>
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html
new file mode 100644
index 00000000000..41335ef035f
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-moretests.tentative.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from DOMParser-parseFromString-url-moretests.html -->
+<meta charset=utf-8>
+<title>Document.parseHTMLUnsafe: Document's url</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+async_test(function() {
+  var iframe = document.createElement("iframe");
+  iframe.onload = this.step_func(function() {
+    var child = iframe.contentWindow;
+
+    test(function() {
+      var doc = Document.parseHTMLUnsafe("<html></html>");
+      assert_equals(doc.URL, "about:blank");
+    }, "Parent window");
+
+    test(function() {
+      var doc = child.Document.parseHTMLUnsafe("<html></html>");
+      assert_equals(doc.URL, "about:blank");
+    }, "Child window");
+
+    var dpBeforeNavigation = child.Document, urlBeforeNavigation = child.document.URL;
+    iframe.onload = this.step_func_done(function() {
+      test(function() {
+        var doc = dpBeforeNavigation.parseHTMLUnsafe("<html></html>");
+        assert_equals(doc.URL, "about:blank");
+      }, "Child window crossing navigation");
+
+      test(function() {
+        var doc = child.Document.parseHTMLUnsafe("<html></html>");
+        assert_equals(doc.URL, "about:blank");
+      }, "Child window after navigation");
+    });
+    iframe.src = "/common/blank.html?2";
+  });
+  iframe.src = "/common/blank.html?1";
+  document.body.appendChild(iframe);
+});
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html
new file mode 100644
index 00000000000..7930bf0ddbf
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url-pushstate.tentative.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from DOMParser-parseFromString-url-pushstate.html -->
+<title>parseHTMLUnsafe test of how the document's URL is set (no base, pushstate)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-pushstate.html" onload="window.resolveLoadPromise();"></iframe>
+
+<script>
+"use strict";
+history.pushState(null, "", "/fake/push-state-from-outer-frame");
+</script>
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html
new file mode 100644
index 00000000000..911e1837063
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe-url.tentative.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from DOMParser-parseFromString-url.html -->
+<title>parseHTMLUnsafe test of how the document's URL is set (no pushstate, no base)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe src="resources/parseHTMLUnsafe-iframe.html" onload="window.resolveLoadPromise();"></iframe>
+<script src="resources/parseHTMLUnsafe-url-tests.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html
new file mode 100644
index 00000000000..2a89370825b
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Document-parseHTMLUnsafe.tentative.html
@@ -0,0 +1,77 @@
+<!doctype html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This was adapted from DOMParser-parseFromString-html.html -->
+<title>parseHTMLUnsafe basic test of HTML parsing</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// |expected| should be an object indicating the expected type of node.
+function assert_node(actual, expected) {
+    assert_true(actual instanceof expected.type,
+                'Node type mismatch: actual = ' + actual.constructor.name + ', expected = ' + expected.type.name);
+    if (typeof(expected.id) !== 'undefined')
+        assert_equals(actual.id, expected.id, expected.idMessage);
+}
+
+var doc;
+setup(function() {
+    doc = Document.parseHTMLUnsafe('<html id="root"><head></head><body></body></html>');
+});
+
+test(function() {
+    var root = doc.documentElement;
+    assert_node(root, { type: HTMLHtmlElement, id: 'root',
+                        idMessage: 'documentElement id attribute should be root.' });
+}, 'Parsing of id attribute');
+
+test(function() {
+    assert_equals(doc.contentType, "text/html")
+}, 'contentType');
+
+test(function() {
+    assert_equals(doc.compatMode, "BackCompat")
+}, 'compatMode');
+
+test(function() {
+    doc = Document.parseHTMLUnsafe('<!DOCTYPE html><html id="root"><head></head><body></body></html>');
+    assert_equals(doc.compatMode, "CSS1Compat")
+}, 'compatMode for a proper DOCTYPE');
+
+// URL- and encoding-related stuff tested separately.
+
+test(function() {
+    assert_equals(doc.location, null,
+                  'The document must have a location value of null.');
+}, 'Location value');
+
+test(function() {
+    var htmldoc = Document.parseHTMLUnsafe("<!DOCTYPE foo></><foo></multiple></>");
+    assert_equals(htmldoc.documentElement.localName, "html");
+    assert_equals(htmldoc.documentElement.namespaceURI, "http://www.w3.org/1999/xhtml");
+}, "Document.parseHTMLUnsafe parses HTML tag soup with no problems");
+
+test(function() {
+   const doc = Document.parseHTMLUnsafe('<noembed>&lt;a&gt;</noembed>');
+   assert_equals(doc.querySelector('noembed').textContent, '&lt;a&gt;');
+}, 'Document.parseHTMLUnsafe should handle the content of <noembed> as raw text');
+
+test(() => {
+   const doc = Document.parseHTMLUnsafe(`
+<html><body>
+<style>
+  @import url(/dummy.css)
+</style>
+<script>document.x = 8<\/script>
+</body></html>`);
+
+  assert_not_equals(doc.querySelector('script'), null, 'script must be found');
+  assert_equals(doc.x, undefined, 'script must not be executed on the inner document');
+  assert_equals(document.x, undefined, 'script must not be executed on the outer document');
+}, 'script is found synchronously even when there is a css import');
+
+test(() => {
+    const doc = Document.parseHTMLUnsafe(`<body><noscript><p id="test1">test1<p id="test2">test2</noscript>`);
+    assert_node(doc.body.firstChild.childNodes[0], { type: HTMLParagraphElement, id: 'test1' });
+    assert_node(doc.body.firstChild.childNodes[1], { type: HTMLParagraphElement, id: 'test2' });
+}, 'must be parsed with scripting disabled, so noscript works');
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html
new file mode 100644
index 00000000000..4a9e300afc2
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/Element-setHTMLUnsafe-04.tentative.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<title>setHTMLUnsafe in HTML</title>
+<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
+<link rel=author href="mailto:jarhar@chromium.org">
+<!-- This test was adapted from innerhtml-04.html -->
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+function testIsChild(p, c) {
+  assert_equals(p.firstChild, c);
+  assert_equals(c.parentNode, p);
+}
+test(function() {
+  var p = document.createElement('p');
+  var b = p.appendChild(document.createElement('b'));
+  var t = b.appendChild(document.createTextNode("foo"));
+  testIsChild(p, b);
+  testIsChild(b, t);
+  assert_equals(t.data, "foo");
+  p.setHTMLUnsafe("");
+  testIsChild(b, t);
+  assert_equals(t.data, "foo");
+}, "setHTMLUnsafe should leave the removed children alone.")
+</script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base-pushstate.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base-pushstate.html
new file mode 100644
index 00000000000..53b855968c8
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base-pushstate.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>An iframe that does parseHTMLUnsafe stuff with base and pushstates itself</title>
+<base href="/fake/base-from-iframe">
+
+<script>
+"use strict";
+history.pushState(null, "", "/fake/push-state-from-iframe");
+</script>
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base.html
new file mode 100644
index 00000000000..6977e938119
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-base.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>An iframe that does parseHTMLUnsafe stuff with base</title>
+<base href="/fake/base-from-iframe">
+
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-pushstate.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-pushstate.html
new file mode 100644
index 00000000000..5e1fae04413
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe-pushstate.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>An iframe that does parseHTMLUnsafe stuff and pushstates itself</title>
+
+<script>
+"use strict";
+history.pushState(null, "", "/fake/push-state-from-iframe");
+</script>
+<script src="/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.html
new file mode 100644
index 00000000000..f47d9605fc8
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>An iframe that does parseHTMLUnsafe stuff</title>
+<script src="parseHTMLUnsafe-iframe.js"></script>
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js
new file mode 100644
index 00000000000..4a0b56869be
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-iframe.js
@@ -0,0 +1,3 @@
+window.doParse = (html) => {
+  return Document.parseHTMLUnsafe(html);
+};
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js
new file mode 100644
index 00000000000..88344d127ce
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/resources/parseHTMLUnsafe-url-tests.js
@@ -0,0 +1,36 @@
+const loadPromise = new Promise(resolve => { window.resolveLoadPromise = resolve; });
+
+function assertURL(doc) {
+  assert_equals(doc.URL, "about:blank", "document.URL");
+  assert_equals(doc.documentURI, "about:blank", "document.documentURI");
+  assert_equals(doc.baseURI, "about:blank", "document.baseURI");
+}
+
+const inputs = {
+  valid: "<html></html>",
+  "invalid XML": `<span x:test="testing">1</span>`
+};
+
+for (const [inputName, input] of Object.entries(inputs)) {
+  test(() => {
+    const doc = Document.parseHTMLUnsafe(input);
+
+    assertURL(doc);
+  }, `${inputName}: created normally`);
+
+  promise_test(async () => {
+    await loadPromise;
+
+    const doc = frames[0].Document.parseHTMLUnsafe(input);
+
+    assertURL(doc);
+  }, `${inputName}: created using another iframe's parseHTMLUnsafe from this frame`);
+
+  promise_test(async () => {
+    await loadPromise;
+
+    const doc = frames[0].doParse(input);
+
+    assertURL(doc);
+  }, `${inputName}: created using another iframe's parseHTMLUnsafe from that frame`);
+}
diff --git a/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html
new file mode 100644
index 00000000000..1c0b1155691
--- /dev/null
+++ b/tests/wpt/tests/html/webappapis/dynamic-markup-insertion/html-unsafe-methods/setHTMLUnsafe.tentative.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/pull/9538">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<script>
+for (const containerType of ['Element', 'ShadowRoot']) {
+  const createContainer = () => {
+    if (containerType == 'ShadowRoot') {
+      return document.createElement('div').attachShadow({mode: 'open'});
+    } else if (containerType == 'Element') {
+      return document.createElement('div');
+    }
+  };
+
+  test(() => {
+    const container = createContainer();
+    container.setHTMLUnsafe('<span title=hello>world</span>');
+
+    assert_equals(container.children.length, 1, 'Only one child node should be created.');
+    assert_equals(container.firstChild.tagName, 'SPAN', 'The child element should be a span.');
+    assert_equals(container.firstChild.getAttribute('title'), 'hello',
+      'The title attribute should be set to hello.');
+    assert_equals(container.firstChild.childNodes.length, 1,
+      'The span should have one child.');
+    assert_true(container.firstChild.childNodes[0] instanceof Text,
+      'The spans child should be a text node.');
+    assert_equals(container.firstChild.textContent, 'world',
+      'The spans textContent should be world.');
+  }, `${containerType}: setHTMLUnsafe with no shadowdom.`);
+
+  test(() => {
+    const container = createContainer();
+    container.setHTMLUnsafe(`<div><template shadowrootmode=open><div>hello</div></template></div>`);
+
+    assert_equals(container.children.length, 1, 'One child should be created in the container.');
+    const shadowRoot = container.firstChild.shadowRoot;
+    assert_true(!!shadowRoot, 'The containers child should have a ShadowRoot.');
+    assert_equals(shadowRoot.children.length, 1, 'One child should be created in the ShadowRoot.');
+    assert_equals(shadowRoot.firstChild.textContent, 'hello',
+      'The ShadowRoots childs textContent should be hello.');
+  }, `${containerType}: setHTMLUnsafe with shadowdom.`);
+}
+
+test(() => {
+  const template = document.createElement('template');
+  template.setHTMLUnsafe('<div>hello world</div>');
+
+  assert_equals(template.children.length, 0, 'template should not have any child nodes.');
+  assert_equals(template.content.children.length, 1, 'template content should have a child div.');
+  assert_equals(template.content.children[0].textContent, 'hello world', 'text content should be set.');
+}, 'template.setHTMLUnsafe() should modify template content fragment rather than actual children.');
+</script>
diff --git a/tests/wpt/tests/images/pattern.ogv b/tests/wpt/tests/images/pattern.ogv
deleted file mode 100644
index 8e3a75982cce747f328d6c243c4d5a1e39334ed6..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/server/context.any.js.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
index 03bf96ec464..b3964a63204 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/server/context.any.js.ini
@@ -6,3 +6,14 @@
 [context.any.serviceworker-module.html]
   expected:
     if product == "firefox": ERROR
+    if product == "firefox_android": ERROR
+
+[context.any.worker-module.html]
+
+[context.any.sharedworker-module.html]
+
+[context.any.sharedworker.html]
+
+[context.any.html]
+
+[context.any.worker.html]
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/server/webtransport-h3.https.sub.any.js.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/server/webtransport-h3.https.sub.any.js.ini
index 60d2e38ecad..0a2363d055d 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/server/webtransport-h3.https.sub.any.js.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/server/webtransport-h3.https.sub.any.js.ini
@@ -1,29 +1,45 @@
 [webtransport-h3.https.sub.any.html]
+  expected:
+    if product == "firefox_android": TIMEOUT
   [WebTransport server should be running and should handle a bidirectional stream]
     expected:
-      if product == "chrome" or product == "firefox": PASS
+      if (product == "chrome") or (product == "firefox"): PASS
+      if product == "firefox_android": TIMEOUT
       FAIL
 
+
 [webtransport-h3.https.sub.any.window.html]
   [WebTransport server should be running and should handle a bidirectional stream]
     expected:
-      if product == "chrome" or product == "firefox": PASS
+      if (product == "chrome") or (product == "firefox"): PASS
       FAIL
 
+
 [webtransport-h3.https.sub.any.worker.html]
+  expected:
+    if product == "firefox_android": TIMEOUT
   [WebTransport server should be running and should handle a bidirectional stream]
     expected:
-      if product == "chrome" or product == "firefox": PASS
+      if (product == "chrome") or (product == "firefox"): PASS
+      if product == "firefox_android": TIMEOUT
       FAIL
 
+
 [webtransport-h3.https.sub.any.sharedworker.html]
+  expected:
+    if product == "firefox_android": TIMEOUT
   [WebTransport server should be running and should handle a bidirectional stream]
     expected:
-      if product == "chrome" or product == "firefox": PASS
+      if (product == "chrome") or (product == "firefox"): PASS
+      if product == "firefox_android": TIMEOUT
       FAIL
 
+
 [webtransport-h3.https.sub.any.serviceworker.html]
+  expected:
+    if product == "firefox_android": TIMEOUT
   [WebTransport server should be running and should handle a bidirectional stream]
     expected:
-      if product == "chrome" or product == "firefox": PASS
+      if (product == "chrome") or (product == "firefox"): PASS
+      if product == "firefox_android": TIMEOUT
       FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/elementTiming.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/elementTiming.html.ini
new file mode 100644
index 00000000000..04fb83bf161
--- /dev/null
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/elementTiming.html.ini
@@ -0,0 +1,4 @@
+[elementTiming.html]
+  [TestDriver actions: element timing]
+    expected:
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/mouseClickCount.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/mouseClickCount.html.ini
index 15eda88934d..cc35c1c8761 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/mouseClickCount.html.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/mouseClickCount.html.ini
@@ -1,4 +1,5 @@
 [mouseClickCount.html]
   [TestDriver actions: test the mouse click counts at different cases]
     expected:
-      if product == "firefox" or product == "safari": FAIL
+      if (product == "firefox") or (product == "safari"): FAIL
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEventProperties.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEventProperties.html.ini
index f3a973c0f50..e0616c90cb4 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEventProperties.html.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEventProperties.html.ini
@@ -1,4 +1,5 @@
 [penPointerEventProperties.html]
   [TestDriver actions: pointerevent properties of pen type]
     expected:
-      if product == "safari" or product == "firefox": FAIL
+      if (product == "safari") or (product == "firefox"): FAIL
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEvents.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEvents.html.ini
index d66b8470ea4..551ec5b5c40 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEvents.html.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/actions/penPointerEvents.html.ini
@@ -1,4 +1,5 @@
 [penPointerEvents.html]
   [TestDriver actions: pointerevent properties of pen type]
     expected:
-      if product == "safari" or product == "firefox": FAIL
+      if (product == "safari") or (product == "firefox"): FAIL
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini
index 26ffac48154..8b7c0f25e6a 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/file_upload.sub.html.ini
@@ -4,3 +4,4 @@
   [File upload using testdriver]
     expected:
       if (product == "epiphany") or (product == "webkit"): FAIL
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/generate_test_report.html.ini b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/generate_test_report.html.ini
index 726eea68b90..e3b4bf3e4dc 100644
--- a/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/generate_test_report.html.ini
+++ b/tests/wpt/tests/infrastructure/metadata/infrastructure/testdriver/generate_test_report.html.ini
@@ -1,4 +1,5 @@
 [generate_test_report.html]
   [TestDriver generate_test_report method]
     expected:
-      if product == "firefox" or product == "epiphany" or product == "webkit": FAIL
+      if (product == "firefox") or (product == "epiphany") or (product == "webkit"): FAIL
+      if product == "firefox_android": FAIL
diff --git a/tests/wpt/tests/interfaces/invokers.tentative.idl b/tests/wpt/tests/interfaces/invokers.tentative.idl
new file mode 100644
index 00000000000..67e2eb4ce19
--- /dev/null
+++ b/tests/wpt/tests/interfaces/invokers.tentative.idl
@@ -0,0 +1,15 @@
+interface mixin InvokerElement {
+  [CEReactions,Reflect=invoketarget] attribute Element? invokeTargetElement;
+  [CEReactions,Reflect,ReflectMissing="auto",ReflectEmpty="auto"] attribute DOMString invokeAction;
+};
+
+interface InvokeEvent : Event {
+    constructor(DOMString type, optional InvokeEventInit eventInitDict = {});
+    readonly attribute Element? invoker;
+    readonly attribute DOMString action;
+};
+
+dictionary InvokeEventInit : EventInit {
+    Element? invoker = null;
+    DOMString action = "";
+};
diff --git a/tests/wpt/tests/interfaces/storage-buckets.tentative.idl b/tests/wpt/tests/interfaces/storage-buckets.tentative.idl
deleted file mode 100644
index 73d72ceab98..00000000000
--- a/tests/wpt/tests/interfaces/storage-buckets.tentative.idl
+++ /dev/null
@@ -1,36 +0,0 @@
-[
-  Exposed=(Window,Worker),
-  SecureContext
-] interface StorageBucketManager {
-    Promise<StorageBucket> open(DOMString name,
-                                optional StorageBucketOptions options = {});
-    Promise<sequence<DOMString>> keys();
-    Promise<undefined> delete(DOMString name);
-};
-
-dictionary StorageBucketOptions {
-  boolean persisted = false;
-  StorageBucketDurability durability = "relaxed";
-  unsigned long long? quota = null;
-  DOMTimeStamp? expires = null;
-};
-
-enum StorageBucketDurability {
-  "strict",
-  "relaxed"
-};
-
-[
-  Exposed=(Window,Worker),
-  SecureContext
-] interface StorageBucket {
-  [Exposed=Window] Promise<boolean> persist();
-  Promise<boolean> persisted();
-
-  Promise<StorageEstimate> estimate();
-
-  Promise<StorageBucketDurability> durability();
-
-  Promise<undefined> setExpires(DOMTimeStamp expires);
-  Promise<DOMTimeStamp> expires();
-};
diff --git a/tests/wpt/tests/intersection-observer/padding-clip.html b/tests/wpt/tests/intersection-observer/padding-clip.html
new file mode 100644
index 00000000000..0126304d640
--- /dev/null
+++ b/tests/wpt/tests/intersection-observer/padding-clip.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Scrollport is used rather than content rect to compute intersection ratio</title>
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="help" href="https://github.com/w3c/IntersectionObserver/issues/504">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+#root {
+  overflow: hidden;
+  position: relative;
+  box-sizing: border-box;
+  width: 100px;
+  height: 100px;
+  padding: 10px;
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+  /* Shift into the padding area */
+  position: relative;
+  left: -10px;
+  top: -10px;
+}
+</style>
+<div id="root">
+  <div id="target"></div>
+</div>
+<script>
+promise_test(async function(t) {
+  const target = document.getElementById("target");
+  assert_true(!!target, "target exists");
+  const root = document.getElementById("root");
+  assert_true(!!root, "root exists");
+  const entries = await new Promise(resolve => {
+    const observer = new IntersectionObserver(resolve, { root });
+    observer.observe(target);
+  });
+  assert_equals(entries.length, 1, "Should have one entry.");
+  assert_equals(entries[0].intersectionRatio, 1, "Should be completely visible.");
+});
+</script>
diff --git a/tests/wpt/tests/jpegxl/META.yml b/tests/wpt/tests/jpegxl/META.yml
new file mode 100644
index 00000000000..d012c7f9bac
--- /dev/null
+++ b/tests/wpt/tests/jpegxl/META.yml
@@ -0,0 +1,3 @@
+spec: https://jpeg.org/jpegxl/workplan.html
+suggested_reviewers:
+  - mo271
diff --git a/tests/wpt/tests/jpegxl/resources/3x3.png b/tests/wpt/tests/jpegxl/resources/3x3.png
new file mode 100644
index 0000000000000000000000000000000000000000..96f86420a5fe51003c039eeb906bac4927e5bd98
GIT binary patch
literal 85
zcmeAS@N?(olHy`uVBq!ia0vp^%plCc1SD^IDZKzvGM+AuAr*|tKh7UuILgb%$Cq&C
i!~g&P+uGO`C@@U7=BobPSN|WVj=|H_&t;ucLK6U0KN#}>

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/jpegxl/resources/3x3_srgb.jxl b/tests/wpt/tests/jpegxl/resources/3x3_srgb.jxl
new file mode 100644
index 0000000000000000000000000000000000000000..5e52b33641e1d27f2067bac9ce09894c7e903ac5
GIT binary patch
literal 55
zcmV-70LcIU3J?$w2?zuM0IUE@62*dr6qj|I`dr;YJJumWkduF(wh`>=84vRBx66Bu
NNCo77aOn5Xbpbv47=Hi&

literal 0
HcmV?d00001

diff --git a/tests/wpt/tests/jpegxl/srgb-ref.html b/tests/wpt/tests/jpegxl/srgb-ref.html
new file mode 100644
index 00000000000..634567e4303
--- /dev/null
+++ b/tests/wpt/tests/jpegxl/srgb-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<title>JPEG XL test reference</title>
+
+<img src="./resources/3x3.png">
diff --git a/tests/wpt/tests/jpegxl/srgb.html b/tests/wpt/tests/jpegxl/srgb.html
new file mode 100644
index 00000000000..9d131787ec3
--- /dev/null
+++ b/tests/wpt/tests/jpegxl/srgb.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<title>JPEG XL test</title>
+<link rel="help" href="https://jpeg.org/jpegxl/">
+<link rel="match" href="srgb-ref.html">
+<meta name="assert" content="JPEG XL image is rendered correctly">
+
+<img src="./resources/3x3_srgb.jxl">
diff --git a/tests/wpt/tests/largest-contentful-paint/video-data-uri.html b/tests/wpt/tests/largest-contentful-paint/video-data-uri.html
index a26ddd14204..01d9aa69257 100644
--- a/tests/wpt/tests/largest-contentful-paint/video-data-uri.html
+++ b/tests/wpt/tests/largest-contentful-paint/video-data-uri.html
@@ -20,129 +20,32 @@
 
     promise_test(async t => {
       lcpEntry = await get_lcp_entry();
-      assert_true(lcpEntry.url.startsWith('data:video/mp4;base64,T2dnUwAC'));
+      assert_true(lcpEntry.url.startsWith('data:video/webm;base64,GkXfo59C'));
     }, "Video of data URI src should trigger an LCP entry to be emitted.")
   </script>
   <!--
-    This is the base64 encoding of the images/pattern.ogv video file.
+    This is the base64 encoding of the images/pattern.webm video file.
   -->
-  <video autoplay muted src="data:video/mp4;base64,T2dnUwACAAAAAAAAAADmWaI+AAAAAKRLSUwBKoB0aGVvcmEDAgEAAgACAAAUAAAUAAwAAAAeAAAA
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-    Xqo9IPXZaceU+4mxu3IDOM1nB9miEvZlRdJVqYnBiCi1YTjCdVTR09SWSpdB0VbJ7X5K4yFui7Z1
-    Jd5eyf7J8/JTx+2ji97qbeSC43FWTwEqySHBdRDnj5dGfPoc5Z1yIDxOmzKKkkTEqU7vDvwgj0xC
-    s82zZqaO10ruMxgqZ/lTOZZmVXKlRKlXdtEJ3duzrZ6ubMGIlwLV6+zHVrI8HdzncTtng2MaugcS
-    SKFo5x4tqwQh7fGnvW140wBPZ2dTAABLEgAAAAAAAOZZoj4PAAAAgHc9kAsAAAAAAAAAAAAAAE9n
-    Z1MAAEAVAAAAAAAA5lmiPhAAAAD0zWMtAv8qLMHID11Q4MCEEGASvCRxsMITR5OwDY5Dn4XCm8FZ
-    0mC8WXkem46VrANWOkfsGXBy8YzCZmpdYGQCHGkQ+rQIfBoCYRko6EaTDQ/QlaHoQoE/PoQ8IxBX
-    4KzTnBuaHFObfUYeJHCXfUeXV5mDTF6qPSD12WnHlPuJsbtyAzjNZwfZohL2ZUXSVamJwYgotWE4
-    wnVU0dPUlkqXQdFWye1+SuMhbou2dSXeXsn+yfPyU8fto4ve6m3kguNxVk8BKskhwXUQ54+XRnz6
-    HOWdciA8TpsyipJExKlO7w78II9MQrPNs2amjtdK7jMYKmf5UzmWZlVypUSpV3bRCd3bs62ermzB
-    iJcC1evsx1ayPB3c53E7Z4NjGroHEkihaOceLasEIe3xp71teNMAT2dnUwAASxUAAAAAAADmWaI+
-    EQAAAKLKJiULAAAAAAAAAAAAAABPZ2dTAARAGAAAAAAAAOZZoj4SAAAAmbxPPwL/KizByA9dUODA
-    hBBgErwkcbDCE0eTsA2OQ5+FwpvBWdJgvFl5HpuOlawDVjpH7BlwcvGMwmZqXWBkAhxpEPq0CHwa
-    AmEZKOhGkw0P0JWh6EKBPz6EPCMQV+Cs05wbmhxTm31GHiRwl31Hl1eZg0xeqj0g9dlpx5T7ibG7
-    cgM4zWcH2aIS9mVF0lWpicGIKLVhOMJ1VNHT1JZKl0HRVsntfkrjIW6LtnUl3l7J/snz8lPH7aOL
-    3upt5ILjcVZPASrJIcF1EOePl0Z8+hzlnXIgPE6bMoqSRMSpTu8O/CCPTEKzzbNmpo7XSu4zGCpn
-    +VM5lmZVcqVEqVd20Qnd27Otnq5swYiXAtXr7MdWsjwd3OdxO2eDYxq6BxJIoWjnHi2rBCHt8ae9
-    bXjTAA==" width="600"></video>
+  <video autoplay muted src="data:video/webm;base64,GkXfo59ChoEBQveBAULygQRC84EIQoKEd2VibUKHgQJChYECGFOAZwEAAAAAAAQxEU2bdLpNu4tT
+  q4QVSalmU6yBoU27i1OrhBZUrmtTrIHYTbuMU6uEElTDZ1OsggEpTbuMU6uEHFO7a1OsggQb7AEA
+  AAAAAABZAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAVSalmsirXsYMPQkBNgI1MYXZm
+  NTkuMjcuMTAwV0GNTGF2ZjU5LjI3LjEwMESJiECpQgAAAAAAFlSua8yuAQAAAAAAAEPXgQFzxYil
+  qEthhRpETZyBACK1nIN1bmSIgQCGhVZfVlA5g4EBI+ODhAH8oFXglLCBFLqBFJqBAlWwiFW3gQJV
+  uIECElTDZ0CBc3OgY8CAZ8iaRaOHRU5DT0RFUkSHjUxhdmY1OS4yNy4xMDBzc9tjwItjxYilqEth
+  hRpETWfIpUWjh0VOQ09ERVJEh5hMYXZjNTkuMzcuMTAwIGxpYnZweC12cDlnyKJFo4hEVVJBVElP
+  TkSHlDAwOjAwOjAzLjIzMzAwMDAwMAAAH0O2dUJl54EAo0G3gQAAgKJJg0IAACYAJsAHBIODAEAA
+  BnAAAHhP///9Q/65f////wmeP/////rwFR5Is7//mm/jI7F//4raSRl5AVkn///8c/8phq//5sl4
+  3m13ew5////YzH/quJ1///+7PmxlWQ33kfuEh+P//7od24Cqpi5QNC9i////+ElnriauN////ElQ
+  YZcxov4Yx///9zJe/hlKf///2wteAkNJPo3jxlcx//aCdOF2s2+6yc3qmgtrvSadpUHyhzKvZLHQ
+  HPfw/yBM392pGbYDf////Jt2l5ctakp//pFL/jdkaumyv2/hPNwTDXLuzq3Hshvf+xED6liPj/Yl
+  Op29O0x//+S1annta3jdCP//jCP//93mv/MS/st8352/8MPJZhn/uSe0wfT3LGr8+KY/dBfBjEv/
+  2aBMTfwh//RLcswNR+aoOCq2VZWOWaQEeS9kChnBNTwP4XHAhU1XXFbX//ZpyKr76trSCwv3k9AS
+  sQfD3WUHFH00UV+Dz33eUpd1rRhdo1WocotOnDqd3RNvs1Tx6BX9JBJ7CS/6OMSd1WhPK+CvqTn4
+  Z1Op01X0KcAq7I08pT5UGSpQAKOTgQGQAKYAQJKcAEoAAAMgAABDQKOTgQMgAKYAQJKcAEoAAAMg
+  AABDQKOTgQSwAKYAQJKcAEoAAAMgAABDQKOTgQZAAKYAQJKcAEoAAAMgAABDQKOTgQfQAKYAQJKc
+  AEoAAAMgAABDQKOTgQlgAKYAQJKcAEoAAAMgAABDQKOTgQrwAKYAQJKcAEoAAAMgAABDQKOTgQyA
+  AKYAQJKcAEoAAAMgAABDQBxTu2uRu4+zgQC3iveBAfGCAbDwgQM=" width="600"></video>
 </body>
 
 </html>
diff --git a/tests/wpt/tests/lint.ignore b/tests/wpt/tests/lint.ignore
index 1b03b0cdeb8..247d2950d55 100644
--- a/tests/wpt/tests/lint.ignore
+++ b/tests/wpt/tests/lint.ignore
@@ -146,6 +146,7 @@ SET TIMEOUT: conformance-checkers/*
 SET TIMEOUT: content-security-policy/*
 SET TIMEOUT: css/compositing/opacity-and-transform-animation-crash.html
 SET TIMEOUT: css/css-contain/contain-body-overflow-002.html
+SET TIMEOUT: css/css-lists/dynamic-counters-crash.html
 SET TIMEOUT: css/css-display/display-contents-shadow-dom-1.html
 SET TIMEOUT: css/CSS2/normal-flow/crashtests/block-in-inline-ax-crash.html
 SET TIMEOUT: css/selectors/selector-placeholder-shown-type-change-001.html
@@ -157,6 +158,7 @@ SET TIMEOUT: css/selectors/invalidation/dir-pseudo-class-in-has.html
 SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has-document-element.html
 SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has-xhtml.xhtml
 SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has.html
+SET TIMEOUT: custom-elements/scoped-registry/scoped-registry-define-upgrade-criteria.tentative.html
 SET TIMEOUT: encrypted-media/polyfill/chrome-polyfill.js
 SET TIMEOUT: encrypted-media/polyfill/clearkey-polyfill.js
 SET TIMEOUT: encrypted-media/scripts/playback-temporary-events.js
@@ -329,6 +331,7 @@ GENERATE_TESTS: mediacapture-fromelement/creation.html
 GENERATE_TESTS: mediacapture-fromelement/ended.html
 GENERATE_TESTS: html/canvas/offscreen/manual/filter/offscreencanvas.filter.html
 GENERATE_TESTS: pointerevents/pointerevent_constructor.html
+GENERATE_TESTS: pointerevents/pointerevent_constructor.https.html
 GENERATE_TESTS: pointerevents/extension/pointerevent_constructor.html
 GENERATE_TESTS: selection/collapse.js
 GENERATE_TESTS: shadow-dom/leaktests/html-collection.html
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-blocking-duration.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-blocking-duration.html
index 1671a386acb..e56a98649ec 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-blocking-duration.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-blocking-duration.html
@@ -1,6 +1,7 @@
 <!DOCTYPE HTML>
 <meta charset=utf-8>
 <title>Long Animation Frame Timing: basic</title>
+<meta name="timeout" content="long">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/utils.js"></script>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-callback-after-promise.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-callback-after-promise.html
deleted file mode 100644
index f7048072fa8..00000000000
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-callback-after-promise.html
+++ /dev/null
@@ -1,27 +0,0 @@
-<!DOCTYPE HTML>
-<meta charset=utf-8>
-<title>Long Animation Frame Timing: promise resolver before callback</title>
-<meta name="timeout" content="long">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="resources/utils.js"></script>
-
-<body>
-<h1>Long Animation Frame: promise resolvers before callback</h1>
-<div id="log"></div>
-<script type="module">
-
-test_promise_script(async t => {
-    const response = await fetch("/common/dummy.xml");
-    await response.text();
-    let count = 0;
-
-    /* A DOM forEach invokes a callback */
-    new URLSearchParams("a=1&b=2").forEach(() => {
-      count++;
-    })
-    busy_wait(very_long_frame_duration);
-}, "resolve", "Response.text.then");
-
-</script>
-</body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-iframe-popup.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-iframe.html
similarity index 85%
rename from tests/wpt/tests/long-animation-frame/tentative/loaf-iframe-popup.html
rename to tests/wpt/tests/long-animation-frame/tentative/loaf-iframe.html
index 565273b6c6a..2885d4fbae9 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-iframe-popup.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-iframe.html
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML>
 <meta charset=utf-8>
-<title>Long Animation Frame Timing: iframes & popups</title>
+<title>Long Animation Frame Timing: iframes</title>
 <meta name="timeout" content="long">
 <body>
 <script src="/resources/testharness.js"></script>
@@ -39,14 +39,6 @@ promise_test(async t => {
     }, [very_long_frame_duration]), t);
 }, 'A long busy wait in a same-origin requestAnimationFrame is a long animation frame');
 
-promise_test(async t => {
-    const [executor] = await prepare_exec_popup(t, ORIGIN);
-    await expect_no_long_frame(() => executor.execute_script((duration) => {
-        const deadline = performance.now() + duration;
-        while (performance.now() < deadline) {}
-    }, [very_long_frame_duration]), t);
-}, 'A long busy wait in a same-origin popup is a not long animation frame');
-
 for (const origin of ["ORIGIN", "REMOTE_ORIGIN", "HTTP_NOTSAMESITE_ORIGIN"]) {
     promise_test(async t => {
         const [executor] = await prepare_exec_iframe(t, host_info[origin]);
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-popup.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-popup.html
new file mode 100644
index 00000000000..3f9758953e9
--- /dev/null
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-popup.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: popups</title>
+<meta name="timeout" content="long">
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script src="resources/utils.js"></script>
+<div id="log"></div>
+<script>
+const host_info = get_host_info();
+const { ORIGIN } = host_info;
+
+promise_test(async t => {
+    const [executor] = await prepare_exec_popup(t, ORIGIN);
+    await expect_no_long_frame(() => executor.execute_script((duration) => {
+        const deadline = performance.now() + duration;
+        while (performance.now() < deadline) {}
+    }, [very_long_frame_duration]), t);
+}, 'A long busy wait in a same-origin popup is a not long animation frame');
+</script>
+</body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-script-block.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-script-block.html
index 5cd82c2c132..1bfad63c82e 100644
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-script-block.html
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-script-block.html
@@ -1,21 +1,27 @@
 <!DOCTYPE HTML>
 <meta charset=utf-8>
-<title>Long Animation Frame Timing: basic</title>
+<title>Long Animation Frame Timing: script blocks</title>
 <meta name="timeout" content="long">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/utils.js"></script>
 <script src="resources/utils.js"></script>
-
+<script src="resources/busy.js?from-parser"></script>
 <body>
 <h1>Long Animation Frame: script blocks</h1>
 <div id="log"></div>
 <script>
-test_self_script_block(t => {
-    const script = document.createElement("script");
-    script.innerHTML = `(${busy_wait.toString()})()`;
-    document.body.appendChild(script);
-}, location.href, "classic-script");
+promise_test(async t => {
+  await new Promise(resolve => {
+    new PerformanceObserver((list, observer) => {
+      if (list.getEntries().find(loaf => loaf.scripts.some(script =>
+        script.name === new URL("resources/busy.js?from-parser", location.href).href))) {
+        observer.disconnect();
+        resolve();
+      }
+    }).observe({type: "long-animation-frame", buffered: true});
+  })
+}, "Parser-inserted classic script should generate a long script");
 
 test_self_script_block(t => {
     const script = document.createElement("script");
@@ -44,7 +50,7 @@ test_self_script_block(t => {
     script.type = "module";
     script.innerHTML = `import("./resources/busy.js?import=${uid}");`;
     document.body.appendChild(script);
-}, new URL("resources/busy.js?import", location.href).href, "execute-script");
+}, new URL("resources/busy.js?import", location.href).href, "module-script");
 
 const busy_wait_str = `  (function() {
     const deadline = performance.now() + 365;
@@ -67,7 +73,5 @@ test_self_script_block(t => {
     script.src = blob_url;
     document.body.appendChild(script);
 }, blob_url, "classic-script");
-
-
 </script>
 </body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-script-nested-callback.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-script-nested-callback.html
new file mode 100644
index 00000000000..c1eb4adc89c
--- /dev/null
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-script-nested-callback.html
@@ -0,0 +1,41 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: nested scripts</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<h1>Long Animation Frame: nested scripts</h1>
+<div id="log"></div>
+<div id="dummy"></div>
+<script>
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(t => {
+    const script_element = document.createElement("script");
+    script_element.async = true;
+    script_element.src = "resources/loaf-after-callback.js";
+    t.add_cleanup(() => script_element.remove());
+    document.body.appendChild(script_element);
+  }, script =>
+    script.name === new URL("resources/loaf-after-callback.js", location.href).href,
+    t);
+  assert_greater_than_equal(script.duration, very_long_frame_duration);
+}, "a callback inside a script block should not mask LoAFs that come afterwards")
+
+promise_test(async t => {
+  const [entry, script] = await expect_long_frame_with_script(t => {
+    const script_element = document.createElement("script");
+    script_element.async = true;
+    script_element.src = "resources/loaf-in-microtask-after-callback.js";
+    t.add_cleanup(() => script_element.remove());
+    document.body.appendChild(script_element);
+  }, script =>
+    script.name === new URL("resources/loaf-in-microtask-after-callback.js", location.href).href,
+    t);
+  assert_greater_than_equal(script.duration, very_long_frame_duration);
+}, "a callback inside a script block should not mask LoAFs in a microtask")
+</script>
+</body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-stream.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-stream.html
new file mode 100644
index 00000000000..e35bc2f9aa7
--- /dev/null
+++ b/tests/wpt/tests/long-animation-frame/tentative/loaf-stream.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Long Animation Frame Timing: stream promise resolvers</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="resources/utils.js"></script>
+
+<body>
+<h1>Long Animation Frame: stream promise resolvers</h1>
+<div id="log"></div>
+<script>
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    await response.body.getReader().read();
+    busy_wait(very_long_frame_duration);
+}, "resolve", "ReadableStreamDefaultReader.read.then");
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    await response.body.getReader({ mode: "byob" }).read(new Int32Array(1000));
+    busy_wait(very_long_frame_duration);
+}, "resolve", "ReadableStreamBYOBReader.read.then");
+
+test_promise_script(async t => {
+    const response = await fetch("/common/dummy.xml");
+    const {readable, writable} = new TransformStream({
+      start() {},
+      transform() {
+        busy_wait(very_long_frame_duration);
+      }
+    });
+    response.body.pipeTo(writable);
+    await readable.getReader().read();
+}, "resolve", "StreamPromise.resolve");
+</script>
+</body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/loaf-trusted-types.html b/tests/wpt/tests/long-animation-frame/tentative/loaf-trusted-types.html
deleted file mode 100644
index 4297842759f..00000000000
--- a/tests/wpt/tests/long-animation-frame/tentative/loaf-trusted-types.html
+++ /dev/null
@@ -1,42 +0,0 @@
-<!DOCTYPE HTML>
-<meta charset=utf-8>
-<title>Long Animation Frame Timing: basic</title>
-<meta name="timeout" content="long">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/common/utils.js"></script>
-<script src="resources/utils.js"></script>
-
-<body>
-<h1>Long Animation Frame: eval</h1>
-<div id="log"></div>
-<script id="element"></script>
-<script>
-setup(() =>
-  assert_implements("trustedTypes" in window,
-    'trustedTypes are not supported.'));
-
-/* This invokes the createHTML trusted type */
-trustedTypes.defaultPolicy = trustedTypes.createPolicy("default", {
-    createHTML: (input) => input
-});
-
-document.getElementById("element").innerHTML = `
-  busy_wait(very_long_frame_duration / 2);
-  Promise.resolve().then(() => {
-    busy_wait(very_long_frame_duration / 2);
-  })
-`;
-
-promise_test(async t => {
-  await new Promise(resolve => new PerformanceObserver(entries => {
-    const entry = entries.getEntries()[0];
-    if (entry.duration >= (very_long_frame_duration - 5) &&
-      entry.scripts.some(script => script.duration >= very_long_frame_duration)) {
-        resolve(entry);
-      }
-  }).observe({type: "long-animation-frame", buffered: true}));
-});
-
-</script>
-</body>
diff --git a/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-after-callback.js b/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-after-callback.js
new file mode 100644
index 00000000000..d9ac74ccf47
--- /dev/null
+++ b/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-after-callback.js
@@ -0,0 +1,7 @@
+(function() {
+  busy_wait(60);
+  new URLSearchParams([["a", "hello"]]).forEach((value, key) => {
+    document.querySelector("#dummy").innerText += value;
+  });
+  busy_wait();
+})();
diff --git a/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-in-microtask-after-callback.js b/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-in-microtask-after-callback.js
new file mode 100644
index 00000000000..c73b604f6dc
--- /dev/null
+++ b/tests/wpt/tests/long-animation-frame/tentative/resources/loaf-in-microtask-after-callback.js
@@ -0,0 +1,7 @@
+(function() {
+  busy_wait(60);
+  Promise.resolve().then(busy_wait);
+  new URLSearchParams([["a", "hello"]]).forEach((value, key) => {
+    document.querySelector("#dummy").innerText += value;
+  });
+})();
diff --git a/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/media-source-webcodecs-util.js b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/media-source-webcodecs-util.js
new file mode 100644
index 00000000000..f581da77b21
--- /dev/null
+++ b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/media-source-webcodecs-util.js
@@ -0,0 +1,136 @@
+const testIV = window.crypto.getRandomValues(new Uint8Array(16));
+const testKey = window.crypto.getRandomValues(new Uint8Array(16));
+const testKeyId = window.crypto.getRandomValues(new Uint8Array(8));
+var testEncodedKey = null;
+
+const keySystemConfig = [{
+  initDataTypes: ['keyids'],
+  videoCapabilities: [{contentType: 'video/mp4; codecs="vp09.00.10.08"'}]
+}];
+
+// TODO(crbug.com/1144908): Consider extracting metadata into helper library
+// shared with webcodecs tests. This metadata is adapted from
+// webcodecs/video-decoder-any.js.
+const vp9 = {
+  async buffer() {
+    return (await fetch('vp9.mp4')).arrayBuffer();
+  },
+  // Note, file might not actually be level 1. See original metadata in
+  // webcodecs test suite.
+  codec: 'vp09.00.10.08',
+  frames: [
+    {offset: 44, size: 3315, type: 'key'},
+    {offset: 3359, size: 203, type: 'delta'},
+    {offset: 3562, size: 245, type: 'delta'},
+    {offset: 3807, size: 172, type: 'delta'},
+    {offset: 3979, size: 312, type: 'delta'},
+    {offset: 4291, size: 170, type: 'delta'},
+    {offset: 4461, size: 195, type: 'delta'},
+    {offset: 4656, size: 181, type: 'delta'},
+    {offset: 4837, size: 356, type: 'delta'},
+    {offset: 5193, size: 159, type: 'delta'}
+  ]
+};
+
+async function getOpenMediaSource(t) {
+  return new Promise(async resolve => {
+    const v = document.createElement('video');
+    document.body.appendChild(v);
+    const mediaSource = new MediaSource();
+    const url = URL.createObjectURL(mediaSource);
+    mediaSource.addEventListener(
+        'sourceopen', t.step_func(() => {
+          URL.revokeObjectURL(url);
+          assert_equals(mediaSource.readyState, 'open', 'MediaSource is open');
+          resolve([v, mediaSource]);
+        }),
+        {once: true});
+    v.src = url;
+  });
+}
+
+async function setupEme(t, video) {
+  testEncodedKey = await crypto.subtle.importKey(
+      'raw', testKey.buffer, 'AES-CTR', false, ['encrypt', 'decrypt']);
+
+  var handler = new MessageHandler(
+      'org.w3.clearkey', {keys: [{kid: testKeyId, key: testKey}]});
+
+  function handleMessage(event) {
+    handler.messagehandler(event.messageType, event.message).then(response => {
+      event.target.update(response).catch(e => {
+        assert_unreached('Failed to update session: ' + e);
+      });
+    });
+  }
+
+  return navigator
+      .requestMediaKeySystemAccess('org.w3.clearkey', keySystemConfig)
+      .then(keySystemAccess => {
+        return keySystemAccess.createMediaKeys();
+      })
+      .then(createdMediaKeys => {
+        return video.setMediaKeys(createdMediaKeys);
+      })
+      .then(_ => {
+        let session = video.mediaKeys.createSession();
+        session.addEventListener('message', handleMessage, false);
+
+        let encoder = new TextEncoder();
+        let initData = encoder.encode(
+            JSON.stringify({'kids': [base64urlEncode(testKeyId)]}));
+        session.generateRequest('keyids', initData).catch(e => {
+          assert_unreached('Failed to generate a license request: ' + e);
+        });
+      })
+      .catch(e => {
+        assert_unreached('Failed to setup EME: ', e);
+      });
+}
+
+async function runEncryptedChunksTest(t) {
+  let buffer = await vp9.buffer();
+  let [videoElement, mediaSource] = await getOpenMediaSource(t);
+
+  // Makes early prototype demo playback easier to control manually.
+  videoElement.controls = true;
+
+  await setupEme(t, videoElement);
+
+  let sourceBuffer = mediaSource.addSourceBuffer(
+      {videoConfig: {codec: vp9.codec, encryptionScheme: 'cenc'}});
+  let nextTimestamp = 0;
+  let frameDuration = 100 * 1000;  // 100 milliseconds
+  // forEach with async callbacks makes it too easy to have uncaught rejections
+  // that don't fail this promise_test or even emit harness error.
+  // Iterating explicitly instead.
+  for (i = 0; i < vp9.frames.length; i++, nextTimestamp += frameDuration) {
+    let frameMetadata = vp9.frames[i];
+    let frameData =
+        new Uint8Array(buffer, frameMetadata.offset, frameMetadata.size);
+    let encryptedFrameData = await window.crypto.subtle.encrypt(
+        {name: 'AES-CTR', counter: testIV, length: 128}, testEncodedKey,
+        frameData);
+
+    await sourceBuffer.appendEncodedChunks(new EncodedVideoChunk({
+      type: frameMetadata.type,
+      timestamp: nextTimestamp,
+      duration: frameDuration,
+      data: encryptedFrameData,
+      decryptConfig: {
+        encryptionScheme: 'cenc',
+        keyId: testKeyId,
+        initializationVector: testIV,
+        subsampleLayout: [{clearBytes: 0, cypherBytes: frameMetadata.size}],
+      }
+    }));
+  }
+
+  mediaSource.endOfStream();
+
+  return new Promise((resolve, reject) => {
+    videoElement.onended = resolve;
+    videoElement.onerror = reject;
+    videoElement.play();
+  });
+}
diff --git a/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-encrypted-webcodecs-appendencodedchunks-play.https.html b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-encrypted-webcodecs-appendencodedchunks-play.https.html
new file mode 100644
index 00000000000..47238af30d4
--- /dev/null
+++ b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-encrypted-webcodecs-appendencodedchunks-play.https.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<title>Test encoded chunk buffering and playback with EME + MediaSource</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/encrypted-media/util/utf8.js"></script>
+<script src="/encrypted-media/util/utils.js"></script>
+<script src="/encrypted-media/util/clearkey-messagehandler.js"></script>
+<script src="media-source-webcodecs-util.js"></script>
+<script>
+setup(() => {
+  assert_implements(
+      SourceBuffer.prototype.hasOwnProperty('appendEncodedChunks'),
+      'SourceBuffer prototype hasOwnProperty "appendEncodedChunks", used ' +
+          'here to feature detect MSE-for-WebCodecs implementation.');
+});
+
+promise_test(async t => {
+  return runEncryptedChunksTest(t);
+}, "Buffer encrypted EncodedVideoChunks (VP9) one-by-one and play them with MSE");
+
+// TODO(crbug.com/1144908): More exhaustive tests (multiple sourcebuffers,
+// varying append patterns, invalid append patterns; eventually more codecs,
+// out-of-order DTS, durations, etc.)
+
+</script>
+</html>
diff --git a/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-webcodecs-appendencodedchunks-play.html b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-webcodecs-appendencodedchunks-play.html
index 4df317a537e..f93f5a9883f 100644
--- a/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-webcodecs-appendencodedchunks-play.html
+++ b/tests/wpt/tests/media-source/mse-for-webcodecs/tentative/mediasource-webcodecs-appendencodedchunks-play.html
@@ -3,8 +3,8 @@
   <title>Test basic encoded chunk buffering and playback with MediaSource</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="media-source-webcodecs-util.js"></script>
 <script>
-
 setup(() => {
   assert_implements(
       SourceBuffer.prototype.hasOwnProperty('appendEncodedChunks'),
@@ -12,39 +12,6 @@ setup(() => {
           'here to feature detect MSE-for-WebCodecs implementation.');
 });
 
-// TODO(crbug.com/1144908): Consider extracting metadata into helper library
-// shared with webcodecs tests. This metadata is adapted from webcodecs/video-decoder-any.js.
-let vp9 = {
-  async buffer() { return (await fetch('vp9.mp4')).arrayBuffer(); },
-  // Note, file might not actually be level 1. See original metadata in webcodecs test suite.
-  codec: "vp09.00.10.08",
-  frames: [{offset: 44, size: 3315, type: 'key'},
-           {offset: 3359, size: 203, type: 'delta'},
-           {offset: 3562, size: 245, type: 'delta'},
-           {offset: 3807, size: 172, type: 'delta'},
-           {offset: 3979, size: 312, type: 'delta'},
-           {offset: 4291, size: 170, type: 'delta'},
-           {offset: 4461, size: 195, type: 'delta'},
-           {offset: 4656, size: 181, type: 'delta'},
-           {offset: 4837, size: 356, type: 'delta'},
-           {offset: 5193, size: 159, type: 'delta'}]
-};
-
-async function getOpenMediaSource(t) {
-  return new Promise(async resolve => {
-    const v = document.createElement('video');
-    document.body.appendChild(v);
-    const mediaSource = new MediaSource();
-    const url = URL.createObjectURL(mediaSource);
-    mediaSource.addEventListener('sourceopen', t.step_func(() => {
-      URL.revokeObjectURL(url);
-      assert_equals(mediaSource.readyState, 'open', 'MediaSource is open');
-      resolve([ v, mediaSource ]);
-    }), { once: true });
-    v.src = url;
-  });
-}
-
 promise_test(async t => {
   let buffer = await vp9.buffer();
   let [ videoElement, mediaSource ] = await getOpenMediaSource(t);
diff --git a/tests/wpt/tests/media/2x2-green.ogv b/tests/wpt/tests/media/2x2-green.ogv
deleted file mode 100644
index 29903c0a817352ea3d3ad6abf188e5aec7470173..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/tests/wpt/tests/mediacapture-extensions/GUM-faceFraming.https.html b/tests/wpt/tests/mediacapture-extensions/GUM-faceFraming.https.html
new file mode 100644
index 00000000000..ef457206215
--- /dev/null
+++ b/tests/wpt/tests/mediacapture-extensions/GUM-faceFraming.https.html
@@ -0,0 +1,150 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Test face framing support</title>
+<link rel="help" href="https://w3c.github.io/mediacapture-extensions/">
+</head>
+<body>
+<h1 class="instructions">Description</h1>
+<p class="instructions">This test checks face framing support.</p>
+<div id='log'></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+"use strict";
+
+const constraintSet = {
+  faceFraming: true
+};
+
+Object.keys(constraintSet).forEach(property => {
+  test(t => {
+    const supportedConstraints =
+        navigator.mediaDevices.getSupportedConstraints();
+    assert_implements_optional(
+        supportedConstraints[property],
+        `Optional property ${property} not in supported constraints`);
+  }, `Test getSupportedConstraints().${property}`);
+
+  promise_test(async t => {
+    const supportedConstraints =
+        navigator.mediaDevices.getSupportedConstraints();
+
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    assert_equals(stream.getAudioTracks().length, 0);
+    assert_equals(stream.getVideoTracks().length, 1);
+    const [videoTrack] = stream.getVideoTracks();
+
+    assert_equals(typeof videoTrack.getCapabilities, 'function');
+    const capabilities = videoTrack.getCapabilities();
+    assert_equals(typeof capabilities, 'object');
+
+    if (!supportedConstraints[property]) {
+      assert_false(property in capabilities);
+    }
+
+    assert_implements_optional(
+        property in capabilities,
+        `Optional property ${property} not in capabilities`);
+
+    // Accept [false], [false, true], [true] and [true, false].
+    assert_array_equals(
+        capabilities[property],
+        capabilities[property].length == 1
+            ? [!!capabilities[property][0]]
+            : [!!capabilities[property][0], !capabilities[property][0]]);
+  }, `Test getCapabilities().${property}`);
+
+  promise_test(async t => {
+    const supportedConstraints =
+        navigator.mediaDevices.getSupportedConstraints();
+
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    assert_equals(stream.getAudioTracks().length, 0);
+    assert_equals(stream.getVideoTracks().length, 1);
+    const [videoTrack] = stream.getVideoTracks();
+
+    const capabilities = videoTrack.getCapabilities();
+
+    assert_equals(typeof videoTrack.getSettings, 'function');
+    const settings = videoTrack.getSettings();
+    assert_equals(typeof settings, 'object');
+
+    if (!supportedConstraints[property] || !(property in capabilities))
+      assert_false(property in settings);
+
+    assert_implements_optional(
+        property in capabilities,
+        `Optional property ${property} not in capabilities`);
+
+    assert_in_array(settings[property], capabilities[property]);
+  }, `Test getSettings().${property}`);
+
+  promise_test(async t => {
+    const supportedConstraints =
+        navigator.mediaDevices.getSupportedConstraints();
+
+    const stream = await navigator.mediaDevices.getUserMedia({video: true});
+    assert_equals(stream.getAudioTracks().length, 0);
+    assert_equals(stream.getVideoTracks().length, 1);
+    const [videoTrack] = stream.getVideoTracks();
+
+    const capabilities = videoTrack.getCapabilities();
+    const constraints = {
+      [property]: {exact: constraintSet[property]}
+    };
+    const oldSettings = videoTrack.getSettings();
+
+    if (supportedConstraints[property] && !(property in capabilities)) {
+      // The user agent supports |constraints| but |videoTrack| is not capable
+      // to apply them.
+      await videoTrack.applyConstraints(constraints).then(
+        () => {
+          assert_unreached('Unexpected success applying constraints');
+        },
+        error => {});
+    } else {
+      // The user agent does not support |constraints| and will ignore them or
+      // the user agent supports |constraints| and |videoTrack| is capable to
+      // apply them.
+      await videoTrack.applyConstraints(constraints).then(
+        () => {},
+        error => {
+          assert_unreached(`Error applying constraints: ${error.message}`);
+        });
+    }
+
+    assert_equals(typeof videoTrack.getConstraints, 'function');
+    const appliedConstraints = videoTrack.getConstraints();
+    assert_equals(typeof appliedConstraints, 'object');
+    const newSettings = videoTrack.getSettings();
+
+    if (!supportedConstraints[property] || !(property in capabilities)) {
+      // The user agent does not support |constraints| and ignored them or
+      // the user agent supports |constraints| but |videoTrack| was not capable
+      // to apply them.
+      assert_object_equals(appliedConstraints, {});
+    } else {
+      // The user agent supports |constraints| and |videoTrack| was capable to
+      // apply them.
+      assert_object_equals(appliedConstraints, constraints);
+    }
+
+    if (!supportedConstraints[property] || !(property in capabilities) ||
+        !capabilities[property].includes(constraintSet[property])) {
+      // The user agent does not support |constraints| and ignored them or
+      // the user agent supports |constraints| but |videoTrack| was not capable
+      // to apply them or the user agent supports |constraints| and
+      // |videoTrack| was capable to apply them but could not satisfy advanced
+      // constraints and skipped them.
+      assert_object_equals(newSettings, oldSettings);
+    } else {
+      // The user agent supports |constraints| and |videoTrack| was capable to
+      // apply them and could satisfy advanced constraints.
+      assert_equals(newSettings[property], constraintSet[property]);
+    }
+  }, `Test applyConstraints() with ${property}`);
+});
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/mediacapture-extensions/MediaStreamTrack-video-stats.https.html b/tests/wpt/tests/mediacapture-extensions/MediaStreamTrack-video-stats.https.html
index 0f85f75b665..6901ed84e39 100644
--- a/tests/wpt/tests/mediacapture-extensions/MediaStreamTrack-video-stats.https.html
+++ b/tests/wpt/tests/mediacapture-extensions/MediaStreamTrack-video-stats.https.html
@@ -1,8 +1,11 @@
 <!doctype html>
 <meta charset=utf-8>
 <meta name="timeout" content="long">
+<button id="button">User gesture</button>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
 <script>
 'use strict';
 
@@ -323,11 +326,28 @@ promise_test(async t => {
   const [track] = stream.getTracks();
   t.add_cleanup(() => track.stop());
 
-  try {
-    track.stats.toJSON();
-    assert_not_reached();
-  } catch (e) {
-    assert_equals(e.name, 'NotSupportedError');
-  }
-}, `getFrameStats throws on audio tracks`);
+  assert_throws_dom('NotSupportedError', () => track.stats);
+}, `track.stats throws on audio tracks`);
+
+promise_test(async t => {
+  const canvas = document.createElement('canvas');
+  const stream = canvas.captureStream(10);
+  const [track] = stream.getTracks();
+  t.add_cleanup(() => track.stop());
+
+  assert_throws_dom('NotSupportedError', () => track.stats);
+}, `track.stats throws on non-device tracks, such as canvas`);
+
+promise_test(async t => {
+  // getDisplayMedia() requires inducing a user gesture.
+  const p = new Promise(r => button.onclick = r);
+  await test_driver.click(button);
+  await p;
+
+  const stream = await navigator.mediaDevices.getDisplayMedia({video:true});
+  const [track] = stream.getTracks();
+  t.add_cleanup(() => track.stop());
+
+  await getFrameStatsUntil(track, stats => stats.totalFrames > 0)
+}, `track.stats is supported on getDisplayMedia tracks`);
 </script>
diff --git a/tests/wpt/tests/mediasession/setactionhandler.html b/tests/wpt/tests/mediasession/setactionhandler.html
index a9df51968c6..3836b52c4b9 100644
--- a/tests/wpt/tests/mediasession/setactionhandler.html
+++ b/tests/wpt/tests/mediasession/setactionhandler.html
@@ -19,6 +19,7 @@
   "hangup",
   "previousslide",
   "nextslide",
+  "enterpictureinpicture",
 ].forEach((action) =>
   test((t) => {
     window.navigator.mediaSession.setActionHandler(action, null);
diff --git a/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-attributes.tentative.window.js b/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-attributes.tentative.window.js
index 811fa515dc2..2fabf45f351 100644
--- a/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-attributes.tentative.window.js
+++ b/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-attributes.tentative.window.js
@@ -45,7 +45,7 @@ promise_test(async t => {
       /*name=*/ null,
       /*reasons=*/['websocket'],
       /*children=*/[{
-        'preventedBackForwardCache': "no",
+        'preventedBackForwardCache': "masked",
         'url': null,
         'src': rc1_child_url,
         // Id and name should be empty.
diff --git a/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-cross-origin-bfcache.tentative.window.js b/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-cross-origin-bfcache.tentative.window.js
index 851dd8c6508..42769cf458b 100644
--- a/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-cross-origin-bfcache.tentative.window.js
+++ b/tests/wpt/tests/performance-timeline/not-restored-reasons/performance-navigation-timing-cross-origin-bfcache.tentative.window.js
@@ -51,7 +51,7 @@ promise_test(async t => {
       /*name=*/ null,
       /*reasons=*/[],
       /*children=*/[{
-        'preventedBackForwardCache': "yes",
+        'preventedBackForwardCache': "masked",
         'url': null,
         'src': rc1_child_url,
         'id': 'test-id',
diff --git a/tests/wpt/tests/pointerevents/coalesced_events_attributes.html b/tests/wpt/tests/pointerevents/coalesced_events_attributes.https.html
similarity index 100%
rename from tests/wpt/tests/pointerevents/coalesced_events_attributes.html
rename to tests/wpt/tests/pointerevents/coalesced_events_attributes.https.html
diff --git a/tests/wpt/tests/pointerevents/coalesced_events_attributes_under_load.html b/tests/wpt/tests/pointerevents/coalesced_events_attributes_under_load.https.html
similarity index 100%
rename from tests/wpt/tests/pointerevents/coalesced_events_attributes_under_load.html
rename to tests/wpt/tests/pointerevents/coalesced_events_attributes_under_load.https.html
diff --git a/tests/wpt/tests/pointerevents/idlharness.window.js b/tests/wpt/tests/pointerevents/idlharness.https.window.js
similarity index 100%
rename from tests/wpt/tests/pointerevents/idlharness.window.js
rename to tests/wpt/tests/pointerevents/idlharness.https.window.js
diff --git a/tests/wpt/tests/pointerevents/pointerevent_after_target_removed.html b/tests/wpt/tests/pointerevents/pointerevent_after_target_removed.html
index 2c5d88708d0..5ab6040cc9c 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_after_target_removed.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_after_target_removed.html
@@ -120,13 +120,13 @@
   // Same tests for dispatched compatibility mouse events.
   addPromiseTest("pointerdown", "mouse", [
     "mouseover@child", "mouseenter@parent", "mouseenter@child",
-    "(child-removed)", "mouseup@parent",
+    "(child-removed)", "mousedown@parent", "mouseup@parent",
     "mousedown@parent", "mouseup@parent",
     "mouseout@parent", "mouseleave@parent"
   ]);
   addPromiseTest("pointerup", "mouse", [
     "mouseover@child", "mouseenter@parent", "mouseenter@child",
-    "mousedown@child", "(child-removed)",
+    "mousedown@child", "(child-removed)", "mouseup@parent",
     "mousedown@parent", "mouseup@parent",
     "mouseout@parent", "mouseleave@parent"
   ]);
diff --git a/tests/wpt/tests/pointerevents/pointerevent_constructor.html b/tests/wpt/tests/pointerevents/pointerevent_constructor.html
index 3b278746e12..af7345fafce 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_constructor.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_constructor.html
@@ -18,42 +18,22 @@
             // set values for non-default constructor
             on_event(target0, "pointermove", this.step_func(function(event) {
                 generate_tests(assert_equals, [
-                    ["getCoalescedEvents().length", event.getCoalescedEvents().length, 2],
+                    ["getCoalescedEvents in event", "getCoalescedEvents" in event, false],
                     ["getPredictedEvents().length", event.getPredictedEvents().length, 2],
                     ["event.target", event.target, target0],
                     ["event.currentTarget", event.currentTarget, target0],
                     ["event.eventPhase", event.eventPhase, Event.AT_TARGET],
                     ["event.clientX", event.clientX, 310],
                     ["event.pointerType", event.pointerType, "pen"],
-                    ["getCoalescedEvents()[0].clientX", event.getCoalescedEvents()[0].clientX, 300],
-                    ["getCoalescedEvents()[1].clientX", event.getCoalescedEvents()[1].clientX, 310],
                     ["getPredictedEvents()[0].clientX", event.getPredictedEvents()[0].clientX, 320],
                     ["getPredictedEvents()[1].clientX", event.getPredictedEvents()[1].clientX, 330],
                 ]);
-                for (var i=0; i<event.getCoalescedEvents().length; i++) {
-                    var coalescedEvent = event.getCoalescedEvents()[i];
-                    generate_tests(assert_equals, [
-                        ["getCoalescedEvents()[" + i + "].pointerId", coalescedEvent.pointerId, event.pointerId],
-                        ["getCoalescedEvents()[" + i + "].pointerType", coalescedEvent.pointerType, event.pointerType],
-                        ["getCoalescedEvents()[" + i + "].isPrimary", coalescedEvent.isPrimary, event.isPrimary],
-                        ["getCoalescedEvents()[" + i + "].getCoalescedEvents().length", coalescedEvent.getCoalescedEvents().length, 0],
-                        ["getCoalescedEvents()[" + i + "].getPredictedEvents().length", coalescedEvent.getPredictedEvents().length, 0],
-                        ["getCoalescedEvents()[" + i + "].target", coalescedEvent.target, null],
-                        ["getCoalescedEvents()[" + i + "].currentTarget", coalescedEvent.currentTarget, null],
-                        ["getCoalescedEvents()[" + i + "].eventPhase", coalescedEvent.eventPhase, Event.NONE],
-                        ["getCoalescedEvents()[" + i + "].cancelable", coalescedEvent.cancelable, false],
-                        ["getCoalescedEvents()[" + i + "].bubbles", coalescedEvent.bubbles, false],
-                        ["getCoalescedEvents()[" + i + "].offsetX", coalescedEvent.offsetX, 310 + (i==0?-10:0)],
-                        ["getCoalescedEvents()[" + i + "].offsetY", coalescedEvent.offsetY, 0],
-                    ]);
-                }
                 for (var i=0; i<event.getPredictedEvents().length; i++) {
                     var predictedEvent = event.getPredictedEvents()[i];
                     generate_tests(assert_equals, [
                         ["getPredictedEvents()[" + i + "].pointerId", predictedEvent.pointerId, event.pointerId],
                         ["getPredictedEvents()[" + i + "].pointerType", predictedEvent.pointerType, event.pointerType],
                         ["getPredictedEvents()[" + i + "].isPrimary", predictedEvent.isPrimary, event.isPrimary],
-                        ["getPredictedEvents()[" + i + "].getCoalescedEvents().length", predictedEvent.getCoalescedEvents().length, 0],
                         ["getPredictedEvents()[" + i + "].getPredictedEvents().length", predictedEvent.getPredictedEvents().length, 0],
                         ["getPredictedEvents()[" + i + "].target", predictedEvent.target, null],
                         ["getPredictedEvents()[" + i + "].currentTarget", predictedEvent.currentTarget, null],
@@ -68,7 +48,6 @@
             on_event(target0, "pointerout", this.step_func(function(event) {
                 generate_tests(assert_equals, [
                     ["default event.pointerType", event.pointerType, ""],
-                    ["default getCoalescedEvents().length", event.getCoalescedEvents().length, 0],
                     ["default getPredictedEvents().length", event.getPredictedEvents().length, 0],
                 ]);
             }));
diff --git a/tests/wpt/tests/pointerevents/pointerevent_constructor.https.html b/tests/wpt/tests/pointerevents/pointerevent_constructor.https.html
new file mode 100644
index 00000000000..3b278746e12
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_constructor.https.html
@@ -0,0 +1,118 @@
+<!doctype html>
+<html>
+    <head>
+        <title>PointerEvent: Constructor test</title>
+        <meta name="viewport" content="width=device-width">
+        <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+        <!-- Additional helper script for common checks across event types -->
+    </head>
+    <body>
+    <h1>PointerEvent: Dispatch custom event</h1>
+    <h4>Test Description: This test checks if PointerEvent constructor works properly.</h4>
+    <div id="target0"></div>
+    <script>
+        async_test(function() {
+            var target0 = document.getElementById("target0");
+            // set values for non-default constructor
+            on_event(target0, "pointermove", this.step_func(function(event) {
+                generate_tests(assert_equals, [
+                    ["getCoalescedEvents().length", event.getCoalescedEvents().length, 2],
+                    ["getPredictedEvents().length", event.getPredictedEvents().length, 2],
+                    ["event.target", event.target, target0],
+                    ["event.currentTarget", event.currentTarget, target0],
+                    ["event.eventPhase", event.eventPhase, Event.AT_TARGET],
+                    ["event.clientX", event.clientX, 310],
+                    ["event.pointerType", event.pointerType, "pen"],
+                    ["getCoalescedEvents()[0].clientX", event.getCoalescedEvents()[0].clientX, 300],
+                    ["getCoalescedEvents()[1].clientX", event.getCoalescedEvents()[1].clientX, 310],
+                    ["getPredictedEvents()[0].clientX", event.getPredictedEvents()[0].clientX, 320],
+                    ["getPredictedEvents()[1].clientX", event.getPredictedEvents()[1].clientX, 330],
+                ]);
+                for (var i=0; i<event.getCoalescedEvents().length; i++) {
+                    var coalescedEvent = event.getCoalescedEvents()[i];
+                    generate_tests(assert_equals, [
+                        ["getCoalescedEvents()[" + i + "].pointerId", coalescedEvent.pointerId, event.pointerId],
+                        ["getCoalescedEvents()[" + i + "].pointerType", coalescedEvent.pointerType, event.pointerType],
+                        ["getCoalescedEvents()[" + i + "].isPrimary", coalescedEvent.isPrimary, event.isPrimary],
+                        ["getCoalescedEvents()[" + i + "].getCoalescedEvents().length", coalescedEvent.getCoalescedEvents().length, 0],
+                        ["getCoalescedEvents()[" + i + "].getPredictedEvents().length", coalescedEvent.getPredictedEvents().length, 0],
+                        ["getCoalescedEvents()[" + i + "].target", coalescedEvent.target, null],
+                        ["getCoalescedEvents()[" + i + "].currentTarget", coalescedEvent.currentTarget, null],
+                        ["getCoalescedEvents()[" + i + "].eventPhase", coalescedEvent.eventPhase, Event.NONE],
+                        ["getCoalescedEvents()[" + i + "].cancelable", coalescedEvent.cancelable, false],
+                        ["getCoalescedEvents()[" + i + "].bubbles", coalescedEvent.bubbles, false],
+                        ["getCoalescedEvents()[" + i + "].offsetX", coalescedEvent.offsetX, 310 + (i==0?-10:0)],
+                        ["getCoalescedEvents()[" + i + "].offsetY", coalescedEvent.offsetY, 0],
+                    ]);
+                }
+                for (var i=0; i<event.getPredictedEvents().length; i++) {
+                    var predictedEvent = event.getPredictedEvents()[i];
+                    generate_tests(assert_equals, [
+                        ["getPredictedEvents()[" + i + "].pointerId", predictedEvent.pointerId, event.pointerId],
+                        ["getPredictedEvents()[" + i + "].pointerType", predictedEvent.pointerType, event.pointerType],
+                        ["getPredictedEvents()[" + i + "].isPrimary", predictedEvent.isPrimary, event.isPrimary],
+                        ["getPredictedEvents()[" + i + "].getCoalescedEvents().length", predictedEvent.getCoalescedEvents().length, 0],
+                        ["getPredictedEvents()[" + i + "].getPredictedEvents().length", predictedEvent.getPredictedEvents().length, 0],
+                        ["getPredictedEvents()[" + i + "].target", predictedEvent.target, null],
+                        ["getPredictedEvents()[" + i + "].currentTarget", predictedEvent.currentTarget, null],
+                        ["getPredictedEvents()[" + i + "].eventPhase", predictedEvent.eventPhase, Event.NONE],
+                        ["getPredictedEvents()[" + i + "].cancelable", predictedEvent.cancelable, false],
+                        ["getPredictedEvents()[" + i + "].bubbles", predictedEvent.bubbles, false],
+                        ["getPredictedEvents()[" + i + "].offsetX", predictedEvent.offsetX, 310 + (i==0?10:20)],
+                        ["getPredictedEvents()[" + i + "].offsetY", predictedEvent.offsetY, 0],
+                    ]);
+                }
+            }));
+            on_event(target0, "pointerout", this.step_func(function(event) {
+                generate_tests(assert_equals, [
+                    ["default event.pointerType", event.pointerType, ""],
+                    ["default getCoalescedEvents().length", event.getCoalescedEvents().length, 0],
+                    ["default getPredictedEvents().length", event.getPredictedEvents().length, 0],
+                ]);
+            }));
+            on_event(target0, "pointerup", this.step_func(function(event) {
+                generate_tests(assert_equals, [
+                    ["type event.pointerType", event.pointerType, "foo"],
+                ]);
+            }));
+
+            on_event(window, "load", this.step_func_done(function() {
+                assert_not_equals(window.PointerEvent, undefined);
+
+                var pointerEventInitDict =
+                {
+                  pointerId: 42,
+                  pointerType: "pen",
+                  isPrimary: true,
+                  clientX: 300,
+                };
+
+                var p1 = new PointerEvent("pointermove", pointerEventInitDict);
+                pointerEventInitDict.clientX += 10;
+                var p2 = new PointerEvent("pointermove", pointerEventInitDict);
+                pointerEventInitDict.clientX += 10;
+                var p3 = new PointerEvent("pointermove", pointerEventInitDict);
+                pointerEventInitDict.clientX += 10;
+                var p4 = new PointerEvent("pointermove", pointerEventInitDict);
+                pointerEventInitDict.coalescedEvents = [p1, p2];
+                pointerEventInitDict.predictedEvents = [p3, p4];
+                pointerEventInitDict.clientX = 310;
+                var event = new PointerEvent("pointermove", pointerEventInitDict);
+                target0.dispatchEvent(event);
+
+                var pointerEventDefault = new PointerEvent("pointerout");
+                target0.dispatchEvent(pointerEventDefault);
+
+                var pointerEventType = new PointerEvent("pointerup", { pointerType: "foo" } );
+                target0.dispatchEvent(pointerEventType);
+            }, "PointerEvent constructor"));
+        })
+    </script>
+    <div id="complete-notice">
+    <p>The following pointer types were detected: <span id="pointertype-log"></span>.</p>
+    </div>
+    <div id="log"></div>
+    </body>
+</html>
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
index 74c14d932ff..bd24daf6171 100644
--- a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.html
@@ -14,7 +14,7 @@
     </head>
     <body onload="run()">
         <h2>pointerrawupdate</h2>
-        <h4>Test Description: This test checks if pointerrawupdate is dispatched correctly. </h4>
+        <h4>Test Description: This test checks that pointerrawupdate is not dispatched on non-SecureContext. </h4>
         <p>Move your mouse within the black box.</p>
         <p>Press left button down and then press middle button while holding down left button. Then release the buttons</p>
         <div id="target0"></div>
@@ -36,8 +36,8 @@
                 });
                 on_event(target0, "pointermove", function (event) {
                     test_pointerrawupdate.step(function() {
-                        assert_true(pointerrawupdateReceived,
-                                    "Pointerrawupdate event should have been received before pointermove.");
+                        assert_false(pointerrawupdateReceived,
+                                    "Pointerrawupdate event should not have been received before pointermove.");
                         }, "Pointerrawupdate event should have been received before pointermove.");
                 });
                 on_event(target0, "pointerdown", function (event) {
@@ -45,9 +45,19 @@
                 });
                 on_event(target0, "pointerup", function (event) {
                     test_pointerrawupdate.step(function() {
-                        assert_true(pointerrawupdateFromButtonChangeReceived,
-                                    "Pointerrawupdate event should have been received from chorded button changes.");
+                        assert_false(pointerrawupdateFromButtonChangeReceived,
+                                    "Pointerrawupdate event should not have been received from chorded button changes.");
                         }, "Pointerrawupdate event should have been received from chorded button changes.");
+
+                    test_pointerrawupdate.step(function() {
+                        assert_false("onpointerrawupdate" in window,
+                                    "Window should not have event handler onpointerrawupdate");
+                        assert_false("onpointerrawupdate" in window.document,
+                                    "Document should not have event handler onpointerrawupdate");
+                        assert_false("onpointerrawupdate" in window.document.documentElement,
+                                     "Element should not have event handler onpointerrawupdate");
+                        }, "onpointerrawupdate should be exposed only in SecureContext");
+
                     // Make sure the test finishes after all the input actions are completed.
                     actions_promise.then( () => {
                         test_pointerrawupdate.done();
diff --git a/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
new file mode 100644
index 00000000000..74c14d932ff
--- /dev/null
+++ b/tests/wpt/tests/pointerevents/pointerevent_pointerrawupdate.https.html
@@ -0,0 +1,69 @@
+<!doctype html>
+<html>
+    <head>
+        <title>pointerrawupdate</title>
+        <meta name="viewport" content="width=device-width">
+        <link rel="stylesheet" type="text/css" href="pointerevent_styles.css">
+        <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>
+        <!-- Additional helper script for common checks across event types -->
+        <script type="text/javascript" src="pointerevent_support.js"></script>
+    </head>
+    <body onload="run()">
+        <h2>pointerrawupdate</h2>
+        <h4>Test Description: This test checks if pointerrawupdate is dispatched correctly. </h4>
+        <p>Move your mouse within the black box.</p>
+        <p>Press left button down and then press middle button while holding down left button. Then release the buttons</p>
+        <div id="target0"></div>
+        <script>
+            var test_pointerrawupdate = async_test("pointerrawupdate event received");
+            var actions_promise;
+
+            var pointerrawupdateReceived = false;
+            var pointerdownReceived = false;
+            var pointerrawupdateFromButtonChangeReceived = false;
+
+            function run() {
+                var target0 = document.getElementById("target0");
+
+                on_event(target0, "pointerrawupdate", function (event) {
+                    pointerrawupdateReceived = true;
+                    if (pointerdownReceived && event.button != -1)
+                      pointerrawupdateFromButtonChangeReceived = true;
+                });
+                on_event(target0, "pointermove", function (event) {
+                    test_pointerrawupdate.step(function() {
+                        assert_true(pointerrawupdateReceived,
+                                    "Pointerrawupdate event should have been received before pointermove.");
+                        }, "Pointerrawupdate event should have been received before pointermove.");
+                });
+                on_event(target0, "pointerdown", function (event) {
+                    pointerdownReceived = true;
+                });
+                on_event(target0, "pointerup", function (event) {
+                    test_pointerrawupdate.step(function() {
+                        assert_true(pointerrawupdateFromButtonChangeReceived,
+                                    "Pointerrawupdate event should have been received from chorded button changes.");
+                        }, "Pointerrawupdate event should have been received from chorded button changes.");
+                    // Make sure the test finishes after all the input actions are completed.
+                    actions_promise.then( () => {
+                        test_pointerrawupdate.done();
+                    });
+                });
+                var actions = new test_driver.Actions();
+                actions_promise = actions.pointerMove(0, 0, {origin: target0, button: actions.ButtonType.LEFT})
+                    .pointerDown({button: actions.ButtonType.LEFT})
+                    .pointerDown({button: actions.ButtonType.MIDDLE})
+                    .pointerUp({button: actions.ButtonType.MIDDLE})
+                    .pointerUp({button: actions.ButtonType.LEFT})
+                    .send();
+            }
+
+        </script>
+        <div id="complete-notice">
+        </div>
+    </body>
+</html>
diff --git a/tests/wpt/tests/pointerevents/pointerlock/pointerevent_getCoalescedEvents_when_pointerlocked.html b/tests/wpt/tests/pointerevents/pointerlock/pointerevent_getCoalescedEvents_when_pointerlocked.https.html
similarity index 100%
rename from tests/wpt/tests/pointerevents/pointerlock/pointerevent_getCoalescedEvents_when_pointerlocked.html
rename to tests/wpt/tests/pointerevents/pointerlock/pointerevent_getCoalescedEvents_when_pointerlocked.https.html
diff --git a/tests/wpt/tests/pointerevents/pointerlock/pointerevent_pointerrawupdate_in_pointerlock.html b/tests/wpt/tests/pointerevents/pointerlock/pointerevent_pointerrawupdate_in_pointerlock.https.html
similarity index 100%
rename from tests/wpt/tests/pointerevents/pointerlock/pointerevent_pointerrawupdate_in_pointerlock.html
rename to tests/wpt/tests/pointerevents/pointerlock/pointerevent_pointerrawupdate_in_pointerlock.https.html
diff --git a/tests/wpt/tests/remote-playback/prompt-and-watch-availability-no-device-manual.html b/tests/wpt/tests/remote-playback/prompt-and-watch-availability-no-device-manual.html
index 7d69f09afcc..fb3e1231bd4 100644
--- a/tests/wpt/tests/remote-playback/prompt-and-watch-availability-no-device-manual.html
+++ b/tests/wpt/tests/remote-playback/prompt-and-watch-availability-no-device-manual.html
@@ -36,8 +36,11 @@
           .watchAvailability(t.step_func(avail => (deviceAvailable = avail)))
           .then(
             t.step_func(() => {
-              promise_rejects_js(t, NotFoundError, v.remote.prompt());
               assert_false(deviceAvailable);
+              promise_rejects_dom(t, 'NotFoundError', v.remote.prompt())
+              .then(() => {
+                t.done();
+              });
             }),
             t.unreached_func()
           );
diff --git a/tests/wpt/tests/resource-timing/iframe-failed-commit.html b/tests/wpt/tests/resource-timing/iframe-failed-commit.html
index 91094072a6d..d3b5cce59ec 100644
--- a/tests/wpt/tests/resource-timing/iframe-failed-commit.html
+++ b/tests/wpt/tests/resource-timing/iframe-failed-commit.html
@@ -50,15 +50,6 @@ const masked_entry_with_csp_test = (url, label) => {
     invariants.assert_tao_failure_resource, label);
 };
 
-// Runs a test (labeled by the given label) to verify that loading an iframe
-// with the given URL, an empty response body and under a "default-src 'none'
-// Content-Security-Policy generates a PerformanceResourceTiming entry and that
-// the entry does expose sensitive timing attributes.
-const empty_unmasked_entry_with_csp_test = (url, label) => {
-  return attribute_test(load_iframe_with_csp, url,
-    invariants.assert_tao_pass_no_redirect_http_empty, label);
-};
-
 // Runs a test (labeled by the given label) to verify that loading an iframe
 // with the given URL under a "default-src 'none' Content-Security-Policy
 // generates a PerformanceResourceTiming entry and that the entry does not
@@ -68,15 +59,6 @@ const non_navigating_masked_entry_with_csp_test = (url, label) => {
     invariants.assert_tao_failure_resource, label);
 };
 
-// Runs a test (labeled by the given label) to verify that loading an iframe
-// with the given URL, an empty response body and under a "default-src 'none'
-// Content-Security-Policy generates a PerformanceResourceTiming entry and that
-// the entry does expose sensitive timing attributes.
-const non_navigating_empty_unmasked_entry_with_csp_test = (url, label) => {
-  return attribute_test(load_iframe_with_csp_no_navigation, url,
-    invariants.assert_tao_pass_no_redirect_http_empty, label);
-};
-
 const {REMOTE_ORIGIN, ORIGINAL_HOST, HTTPS_PORT} = get_host_info();
 const unhosted_url = `https://nonexistent.${ORIGINAL_HOST}:${HTTPS_PORT}/`;
 
@@ -91,7 +73,8 @@ masked_entry_test(
 unmasked_entry_with_csp_test("/resource-timing/resources/csp-default-none.html",
   "Same-origin iframe that complies with CSP attribute gets reported");
 
-unmasked_entry_with_csp_test("/resource-timing/resources/green-frame.html",
+// masked because this will load an error page which is cross-origin.
+masked_entry_with_csp_test("/resource-timing/resources/green-frame.html",
   "Same-origin iframe that doesn't comply with CSP attribute gets reported");
 
 masked_entry_with_csp_test(
@@ -102,7 +85,7 @@ masked_entry_with_csp_test(
   new URL("/resource-timing/resources/green-frame.html", REMOTE_ORIGIN),
   "Cross-origin iframe that doesn't comply with CSP attribute gets reported");
 
-empty_unmasked_entry_with_csp_test(
+masked_entry_with_csp_test(
   "/resource-timing/resources/200_empty.asis",
   "Same-origin empty iframe with a 200 status gets reported");
 
@@ -110,11 +93,11 @@ masked_entry_with_csp_test(
   new URL("/resource-timing/resources/200_empty.asis", REMOTE_ORIGIN),
   "Cross-origin empty iframe with a 200 status gets reported");
 
-non_navigating_empty_unmasked_entry_with_csp_test(
+non_navigating_masked_entry_with_csp_test(
     new URL("/resource-timing/resources/204_empty.asis", location.origin),
     "Same-origin empty iframe with a 204 status gets reported");
 
-non_navigating_empty_unmasked_entry_with_csp_test(
+non_navigating_masked_entry_with_csp_test(
     new URL("/resource-timing/resources/205_empty.asis", location.origin),
     "Same-origin empty iframe with a 205 status gets reported");
 
diff --git a/tests/wpt/tests/resources/testdriver.js b/tests/wpt/tests/resources/testdriver.js
index 4b8656b276e..0327e1759a9 100644
--- a/tests/wpt/tests/resources/testdriver.js
+++ b/tests/wpt/tests/resources/testdriver.js
@@ -824,6 +824,149 @@
          */
         reset_fedcm_cooldown: function(context=null) {
           return window.test_driver_internal.reset_fedcm_cooldown(context);
+        },
+
+        /**
+         * Creates a virtual sensor for use with the Generic Sensors APIs.
+         *
+         * Matches the `Create Virtual Sensor
+         * <https://w3c.github.io/sensors/#create-virtual-sensor-command>`_
+         * WebDriver command.
+         *
+         * Once created, a virtual sensor is available to all navigables under
+         * the same top-level traversable (i.e. all frames in the same page,
+         * regardless of origin).
+         *
+         * @param {String} sensor_type - A `virtual sensor type
+         *                               <https://w3c.github.io/sensors/#virtual-sensor-metadata-virtual-sensor-type>`_
+         *                               such as "accelerometer".
+         * @param {Object} [sensor_params={}] - Optional parameters described
+         *                                     in `Create Virtual Sensor
+         *                                     <https://w3c.github.io/sensors/#create-virtual-sensor-command>`_.
+         * @param {WindowProxy} [context=null] - Browsing context in which to
+         *                                       run the call, or null for the
+         *                                       current browsing context.
+         *
+         * @returns {Promise} Fulfilled when virtual sensor is created.
+         *                    Rejected in case the WebDriver command errors out
+         *                    (including if a virtual sensor of the same type
+         *                    already exists).
+         */
+        create_virtual_sensor: function(sensor_type, sensor_params={}, context=null) {
+          return window.test_driver_internal.create_virtual_sensor(sensor_type, sensor_params, context);
+        },
+
+        /**
+         * Causes a virtual sensor to report a new reading to any connected
+         * platform sensor.
+         *
+         * Matches the `Update Virtual Sensor Reading
+         * <https://w3c.github.io/sensors/#update-virtual-sensor-reading-command>`_
+         * WebDriver command.
+         *
+         * Note: The ``Promise`` it returns may fulfill before or after a
+         * "reading" event is fired. When using
+         * :js:func:`EventWatcher.wait_for`, it is necessary to take this into
+         * account:
+         *
+         * Note: New values may also be discarded due to the checks in `update
+         * latest reading
+         * <https://w3c.github.io/sensors/#update-latest-reading>`_.
+         *
+         * @example
+         * // Avoid races between EventWatcher and update_virtual_sensor().
+         * // This assumes you are sure this reading will be processed (see
+         * // the example below otherwise).
+         * const reading = { x: 1, y: 2, z: 3 };
+         * await Promise.all([
+         *   test_driver.update_virtual_sensor('gyroscope', reading),
+         *   watcher.wait_for('reading')
+         * ]);
+         *
+         * @example
+         * // Do not wait forever if you are not sure the reading will be
+         * // processed.
+         * const readingPromise = watcher.wait_for('reading');
+         * const timeoutPromise = new Promise(resolve => {
+         *     t.step_timeout(() => resolve('TIMEOUT', 3000))
+         * });
+         *
+         * const reading = { x: 1, y: 2, z: 3 };
+         * await test_driver.update_virtual_sensor('gyroscope', 'reading');
+         *
+         * const value =
+         *     await Promise.race([timeoutPromise, readingPromise]);
+         * if (value !== 'TIMEOUT') {
+         *   // Do something. The "reading" event was fired.
+         * }
+         *
+         * @param {String} sensor_type - A `virtual sensor type
+         *                               <https://w3c.github.io/sensors/#virtual-sensor-metadata-virtual-sensor-type>`_
+         *                               such as "accelerometer".
+         * @param {Object} reading - An Object describing a reading in a format
+         *                           dependent on ``sensor_type`` (e.g. ``{x:
+         *                           1, y: 2, z: 3}`` or ``{ illuminance: 42
+         *                           }``).
+         * @param {WindowProxy} [context=null] - Browsing context in which to
+         *                                       run the call, or null for the
+         *                                       current browsing context.
+         *
+         * @returns {Promise} Fulfilled after the reading update reaches the
+         *                    virtual sensor. Rejected in case the WebDriver
+         *                    command errors out (including if a virtual sensor
+         *                    of the given type does not exist).
+         */
+        update_virtual_sensor: function(sensor_type, reading, context=null) {
+          return window.test_driver_internal.update_virtual_sensor(sensor_type, reading, context);
+        },
+
+        /**
+         * Triggers the removal of a virtual sensor if it exists.
+         *
+         * Matches the `Delete Virtual Sensor
+         * <https://w3c.github.io/sensors/#delete-virtual-sensor-command>`_
+         * WebDriver command.
+         *
+         * @param {String} sensor_type - A `virtual sensor type
+         *                               <https://w3c.github.io/sensors/#virtual-sensor-metadata-virtual-sensor-type>`_
+         *                               such as "accelerometer".
+         * @param {WindowProxy} [context=null] - Browsing context in which to
+         *                                       run the call, or null for the
+         *                                       current browsing context.
+         *
+         * @returns {Promise} Fulfilled after the virtual sensor has been
+         *                    removed or if a sensor of the given type does not
+         *                    exist. Rejected in case the WebDriver command
+         *                    errors out.
+
+         */
+        remove_virtual_sensor: function(sensor_type, context=null) {
+          return window.test_driver_internal.remove_virtual_sensor(sensor_type, context);
+        },
+
+        /**
+         * Returns information about a virtual sensor.
+         *
+         * Matches the `Get Virtual Sensor Information
+         * <https://w3c.github.io/sensors/#get-virtual-sensor-information-command>`_
+         * WebDriver command.
+         *
+         * @param {String} sensor_type - A `virtual sensor type
+         *                               <https://w3c.github.io/sensors/#virtual-sensor-metadata-virtual-sensor-type>`_
+         *                               such as "accelerometer".
+         * @param {WindowProxy} [context=null] - Browsing context in which to
+         *                                       run the call, or null for the
+         *                                       current browsing context.
+         *
+         * @returns {Promise} Fulfilled with an Object with the properties
+         *                    described in `Get Virtual Sensor Information
+         *                    <https://w3c.github.io/sensors/#get-virtual-sensor-information-command>`_.
+         *                    Rejected in case the WebDriver command errors out
+         *                    (including if a virtual sensor of the given type
+         *                    does not exist).
+         */
+        get_virtual_sensor_information: function(sensor_type, context=null) {
+            return window.test_driver_internal.get_virtual_sensor_information(sensor_type, context);
         }
     };
 
@@ -980,6 +1123,22 @@
 
         async reset_fedcm_cooldown(context=null) {
             throw new Error("reset_fedcm_cooldown() is not implemented by testdriver-vendor.js");
+        },
+
+        async create_virtual_sensor(sensor_type, sensor_params, context=null) {
+            throw new Error("create_virtual_sensor() is not implemented by testdriver-vendor.js");
+        },
+
+        async update_virtual_sensor(sensor_type, reading, context=null) {
+            throw new Error("update_virtual_sensor() is not implemented by testdriver-vendor.js");
+        },
+
+        async remove_virtual_sensor(sensor_type, context=null) {
+            throw new Error("remove_virtual_sensor() is not implemented by testdriver-vendor.js");
+        },
+
+        async get_virtual_sensor_information(sensor_type, context=null) {
+            throw new Error("get_virtual_sensor_information() is not implemented by testdriver-vendor.js");
         }
     };
 })();
diff --git a/tests/wpt/tests/selection/contenteditable/modifying-selection-with-middle-mouse-button.tentative.html b/tests/wpt/tests/selection/contenteditable/modifying-selection-with-non-primary-mouse-button.tentative.html
similarity index 70%
rename from tests/wpt/tests/selection/contenteditable/modifying-selection-with-middle-mouse-button.tentative.html
rename to tests/wpt/tests/selection/contenteditable/modifying-selection-with-non-primary-mouse-button.tentative.html
index a8287d90028..cb2e44295a9 100644
--- a/tests/wpt/tests/selection/contenteditable/modifying-selection-with-middle-mouse-button.tentative.html
+++ b/tests/wpt/tests/selection/contenteditable/modifying-selection-with-non-primary-mouse-button.tentative.html
@@ -2,7 +2,9 @@
 <html>
 <head>
 <meta charset="utf-8">
-<title>Testing default action of `mousedown` of middle button and `mouseup` of middle button</title>
+<meta name="variant" content="?middle">
+<meta name="variant" content="?secondary">
+<title>Testing default action of `mousedown` of middle button and `mouseup` of middle/secondary button</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
@@ -19,6 +21,12 @@ span {
 <script>
 "use strict";
 
+const button = location.search.substr(1);
+
+function getButtonType(actions) {
+  return button == "middle" ? actions.ButtonType.MIDDLE : actions.ButtonType.RIGHT;
+}
+
 var editor = document.querySelector("div[contenteditable]");
 var span1, span2, link;
 var selection = getSelection();
@@ -27,6 +35,7 @@ function preventDefault(event) {
   event.preventDefault();
 }
 editor.addEventListener("paste", preventDefault, {capture: true});
+document.addEventListener("contextmenu", preventDefault, {capture: true});
 
 function resetEditor() {
   editor.innerHTML =
@@ -43,17 +52,17 @@ promise_test(async () => {
   await actions
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span1})
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .send();
 
   assert_equals(document.activeElement, editor,
     "The clicked editor should get focus");
   assert_true(selection.isCollapsed,
-    "Selection should be collapsed after middle button click");
+    `Selection should be collapsed after ${button} button click`);
   assert_equals(selection.focusNode, span1.firstChild,
-    "Selection should be collapsed in the first <span> element which was clicked by middle button");
-}, "Middle click should set focus to clicked editable element and collapse selection around the clicked point");
+    `Selection should be collapsed in the first <span> element which was clicked by ${button} button`);
+}, `${button} click should set focus to clicked editable element and collapse selection around the clicked point`);
 
 promise_test(async () => {
   resetEditor();
@@ -63,17 +72,17 @@ promise_test(async () => {
   await actions
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span2})
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .send();
 
   assert_equals(document.activeElement, editor,
     "The clicked editor should keep having focus");
   assert_true(selection.isCollapsed,
-    "Selection should be collapsed after middle button click");
+    `Selection should be collapsed after ${button} button click`);
   assert_equals(selection.focusNode, span2.firstChild,
-    "Selection should be collapsed in the second <span> element which was clicked by middle button");
-}, "Middle click should move caret in an editable element");
+    `Selection should be collapsed in the second <span> element which was clicked by ${button} button`);
+}, `${button} click should move caret in an editable element`);
 
 promise_test(async () => {
   resetEditor();
@@ -84,8 +93,8 @@ promise_test(async () => {
   await actions
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span2})
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .send();
   removeEventListener("mousedown", preventDefault);
 
@@ -93,7 +102,7 @@ promise_test(async () => {
     "Selection should keep collapsed selection in the first <span> element");
   assert_equals(selection.focusOffset, 2,
     "Selection should keep collapsed selection at 2 of the first <span> element");
-}, "Middle click shouldn't move caret in an editable element if the default of mousedown event is prevented");
+}, `${button} click shouldn't move caret in an editable element if the default of mousedown event is prevented`);
 
 promise_test(async () => {
   resetEditor();
@@ -104,8 +113,8 @@ promise_test(async () => {
   await actions
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span2})
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .send();
   removeEventListener("pointerdown", preventDefault);
 
@@ -113,7 +122,7 @@ promise_test(async () => {
     "Selection should keep collapsed selection in the first <span> element");
   assert_equals(selection.focusOffset, 2,
     "Selection should keep collapsed selection at 2 of the first <span> element");
-}, "Middle click shouldn't move caret in an editable element if the default of pointerdown event is prevented");
+}, `${button} click shouldn't move caret in an editable element if the default of pointerdown event is prevented`);
 
 promise_test(async () => {
   resetEditor();
@@ -124,8 +133,8 @@ promise_test(async () => {
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span2})
     .keyDown("\uE008")
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .keyUp("\uE008")
     .send();
 
@@ -134,8 +143,8 @@ promise_test(async () => {
   assert_equals(selection.anchorOffset, 2,
     "Selection#anchorNode should keep at 2 of the first <span> element");
   assert_equals(selection.focusNode, span2.firstChild,
-    "Selection#focusNode should be in the second <span> element which was clicked by middle button");
-}, "Shift + Middle click should extend the selection");
+    `Selection#focusNode should be in the second <span> element which was clicked by ${button} button`);
+}, `Shift + ${button} click should extend the selection`);
 
 promise_test(async () => {
   resetEditor();
@@ -146,16 +155,16 @@ promise_test(async () => {
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: link})
     .keyDown("\uE008")
-    .pointerDown({button: actions.ButtonType.MIDDLE})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
+    .pointerUp({button: getButtonType(actions)})
     .keyUp("\uE008")
     .send();
 
   assert_equals(selection.focusNode, link.firstChild,
-    "Selection#focusNode should be in the <a href> element which was clicked by middle button");
+    `Selection#focusNode should be in the <a href> element which was clicked by ${button} button`);
   assert_true(selection.isCollapsed,
     "Selection#isCollapsed should be true");
-}, "Shift + Middle click in a link shouldn't extend the selection");
+}, `Shift + ${button} click in a link shouldn't extend the selection`);
 
 promise_test(async () => {
   resetEditor();
@@ -181,32 +190,32 @@ promise_test(async () => {
     assert_true(selection.isCollapsed,
       "Selection should be collapsed before pointerup event");
     assert_equals(selection.focusNode, span2.firstChild,
-      "Selection should be collapsed in the second <span> element which was clicked by middle button before pointerup event ");
+      `selection should be collapsed in the second <span> element which was clicked by ${button} button before pointerup event`);
   }, {once: true});
   let focusOffsetAtMouseUp;
   editor.addEventListener("mouseup", () => {
     assert_true(selection.isCollapsed,
       "Selection should be collapsed before mouseup event");
     assert_equals(selection.focusNode, span2.firstChild,
-      "Selection should be collapsed in the second <span> element which was clicked by middle button before mouseup event ");
+      `Selection should be collapsed in the second <span> element which was clicked by ${button} button before mouseup event`);
     focusOffsetAtMouseUp = selection.focusOffset;
   }, {once: true});
   let actions = new test_driver.Actions();
   await actions
     .pointerMove(0, 0)
     .pointerMove(0, 0, {origin: span2})
-    .pointerDown({button: actions.ButtonType.MIDDLE})
+    .pointerDown({button: getButtonType(actions)})
     .pointerMove(0, 0, {origin: span1})
-    .pointerUp({button: actions.ButtonType.MIDDLE})
+    .pointerUp({button: getButtonType(actions)})
     .send();
 
   assert_true(selection.isCollapsed,
-    "Selection shouldn't be extended by pointer moves during pressing middle button");
+    `Selection shouldn't be extended by pointer moves during pressing ${button} button`);
   assert_equals(selection.focusNode, span2.firstChild,
     "Selection#focusNode should stay in the second <span> element");
   assert_equals(selection.focusOffset, focusOffsetAtMouseUp,
     "Selection#focusOffset should stay in the second <span> element");
-}, "Middle mouse button down should move caret, but middle mouse button up shouldn't move caret");
+}, `${button} mouse button down should move caret, but its button up shouldn't move caret`);
 
 </script>
 </body>
diff --git a/tests/wpt/tests/service-workers/service-worker/partitioned-cookies.tentative.https.html b/tests/wpt/tests/service-workers/service-worker/partitioned-cookies.tentative.https.html
index 5f6371cb428..7a8bd3f5cf8 100644
--- a/tests/wpt/tests/service-workers/service-worker/partitioned-cookies.tentative.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/partitioned-cookies.tentative.https.html
@@ -7,12 +7,13 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="resources/test-helpers.sub.js"></script>
 <script src="/common/get-host-info.sub.js"></script>
+<script src="resources/partitioned-cookies-test-helpers.js"></script>
 </head>
 
 <!--
-  This test exercises partitioned service workers' interaction with partitioned cookies.
-  Partitioned service workers should only be able to interact with partitioned cookies whose
-  partition key matches the worker's partition.
+  This test exercises partitioned service workers' interaction with partitioned
+  cookies. Partitioned service workers should only be able to interact with
+  partitioned cookies whose partition key matches the worker's partition.
 -->
 
 <body>
@@ -24,7 +25,8 @@ promise_test(async t => {
   const absolute_scope = new URL(scope, window.location).href;
 
   // Set a Partitioned cookie.
-  document.cookie = '__Host-partitioned=123; Secure; Path=/; SameSite=None; Partitioned;';
+  document.cookie =
+      '__Host-partitioned=123; Secure; Path=/; SameSite=None; Partitioned;';
   assert_true(document.cookie.includes('__Host-partitioned=123'));
 
   // Set an unpartitioned cookie.
@@ -35,12 +37,7 @@ promise_test(async t => {
   await wait_for_state(t, reg.installing, 'activated');
   t.add_cleanup(() => reg.unregister());
 
-  // on_message will be reassigned below based on the expected reply from the service worker.
-  let on_message;
-  self.addEventListener('message', ev => on_message(ev));
-  navigator.serviceWorker.addEventListener('message', evt => {
-    self.postMessage(evt.data, '*');
-  });
+  const next_message = worker_message_generator();
 
   const retrieved_registrations =
         await navigator.serviceWorker.getRegistrations();
@@ -49,62 +46,46 @@ promise_test(async t => {
   const filtered_registrations =
     retrieved_registrations.filter(reg => reg.scope == absolute_scope);
 
-  // First test that the worker script started correctly and message passing is enabed.
-  let resolve_wait_promise;
-  let wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  let got;
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
+  // First test that the worker script started correctly and message passing
+  // is enabed.
   filtered_registrations[0].active.postMessage({type: 'test_message'});
-  await wait_promise;
-  assert_true(got.ok, 'Message passing');
+  const msg1 = await next_message();
+  assert_true(msg1.ok, 'Message passing');
 
   // Test that the partitioned cookie is available to this worker via HTTP.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_http'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
-  assert_true(got.cookies.includes('__Host-partitioned'), 'Can access partitioned cookie via HTTP');
-  assert_true(got.cookies.includes('unpartitioned'), 'Can access unpartitioned cookie via HTTP');
+  const msg2 = await next_message();
+  assert_true(msg2.ok, 'Get cookies');
+  assert_true(
+      msg2.cookies.includes('__Host-partitioned'),
+      'Can access partitioned cookie via HTTP');
+  assert_true(
+      msg2.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via HTTP');
 
-  // Test that the partitioned cookie is available to this worker via CookieStore API.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
+  // Test that the partitioned cookie is available to this worker via
+  // CookieStore API.
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_js'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
-  assert_true(got.cookies.includes('__Host-partitioned'), 'Can access partitioned cookie via JS');
-  assert_true(got.cookies.includes('unpartitioned'), 'Can access unpartitioned cookie via JS');
+  const msg3 = await next_message();
+  assert_true(msg3.ok, 'Get cookies');
+  assert_true(
+      msg3.cookies.includes('__Host-partitioned'),
+      'Can access partitioned cookie via JS');
+  assert_true(
+      msg3.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via JS');
 
   // Test that the partitioned cookie is not available to this worker in HTTP
   // requests from importScripts.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_import'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
-  assert_true(got.cookies.includes('__Host-partitioned'), 'Can access partitioned cookie via importScripts');
-  assert_true(got.cookies.includes('unpartitioned'), 'Can access unpartitioned cookie via importScripts');
+  const msg4 = await next_message();
+  assert_true(msg4.ok, 'Get cookies');
+  assert_true(
+      msg4.cookies.includes('__Host-partitioned'),
+      'Can access partitioned cookie via importScripts');
+  assert_true(
+      msg4.cookies.includes('unpartitioned'),
+      'Can access unpartitioned cookie via importScripts');
 
   const popup = window.open(
       new URL(
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/fetch-access-control.py b/tests/wpt/tests/service-workers/service-worker/resources/fetch-access-control.py
index 380a7d62225..67c837bca7d 100644
--- a/tests/wpt/tests/service-workers/service-worker/resources/fetch-access-control.py
+++ b/tests/wpt/tests/service-workers/service-worker/resources/fetch-access-control.py
@@ -39,8 +39,8 @@ def main(request, response):
           headers.append((b"Content-Type", b"video/mp4"))
           body = open(os.path.join(request.doc_root, u"media", u"movie_5.mp4"), "rb").read()
         else:
-          headers.append((b"Content-Type", b"video/ogg"))
-          body = open(os.path.join(request.doc_root, u"media", u"movie_5.ogv"), "rb").read()
+          headers.append((b"Content-Type", b"video/webm"))
+          body = open(os.path.join(request.doc_root, u"media", u"movie_5.webm"), "rb").read()
 
         length = len(body)
         # If "PartialContent" is specified, the requestor wants to test range
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-frame.html b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-frame.html
index 00b3412c41f..97f3a9c3df3 100644
--- a/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-frame.html
+++ b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-frame.html
@@ -3,6 +3,7 @@
 <meta charset="utf-8"/>
 <meta name="timeout" content="long">
 <title>Service Worker: Partitioned Cookies 3P Iframe</title>
+<script src="partitioned-cookies-test-helpers.js"></script>
 <script src="/resources/testharness.js"></script>
 <script src="test-helpers.sub.js"></script>
 </head>
@@ -15,8 +16,9 @@ promise_test(async t => {
   const scope = './partitioned-cookies-3p-';
   const absolute_scope = new URL(scope, window.location).href;
 
-  assert_false(document.cookie.includes('__Host-partitioned=123'), 'DOM cannot access partitioned cookie');
-  assert_true(document.cookie.includes('unpartitioned=456'), 'DOM can access unpartitioned cookie');
+  assert_false(
+      document.cookie.includes('__Host-partitioned=123'),
+      'DOM cannot access partitioned cookie');
 
   const reg = await service_worker_unregister_and_register(t, script, scope);
   await wait_for_state(t, reg.installing, 'activated');
@@ -26,80 +28,47 @@ promise_test(async t => {
   let filtered_registrations =
     retrieved_registrations.filter(reg => reg.scope == absolute_scope);
 
-  // on_message will be reassigned below based on the expected reply from the service worker.
-  let on_message;
-  self.addEventListener('message', ev => on_message(ev));
-  navigator.serviceWorker.addEventListener('message', evt => {
-    self.postMessage(evt.data, '*');
-  });
+  const next_message = worker_message_generator();
 
-  // First test that the worker script started correctly and message passing is enabled.
-  let resolve_wait_promise;
-  let wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  let got;
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
+  // First test that the worker script started correctly and message passing
+  // is enabled.
   filtered_registrations[0].active.postMessage({type: 'test_message'});
-  await wait_promise;
-  assert_true(got.ok, 'Message passing');
+  const msg1 = await next_message();
+  assert_true(msg1.ok, 'Message passing');
 
   // Test that the partitioned cookie is not available to this worker via HTTP.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_http'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
+  const msg2 = await next_message();
+  assert_true(msg2.ok, 'Get cookies');
   assert_false(
-      got.cookies.includes('__Host-partitioned'),
+      msg2.cookies.includes('__Host-partitioned'),
       'Worker cannot access partitioned cookie via HTTP');
   assert_true(
-      got.cookies.includes('unpartitioned'),
+      msg2.cookies.includes('unpartitioned'),
       'Worker can access unpartitioned cookie via HTTP');
 
-  // Test that the partitioned cookie is not available to this worker via CookieStore API.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
+  // Test that the partitioned cookie is not available to this worker via
+  // CookieStore API.
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_js'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
+  const msg3 = await next_message();
+  assert_true(msg3.ok, 'Get cookies');
   assert_false(
-      got.cookies.includes('__Host-partitioned'),
+      msg3.cookies.includes('__Host-partitioned'),
       'Worker cannot access partitioned cookie via JS');
   assert_true(
-      got.cookies.includes('unpartitioned'),
+      msg3.cookies.includes('unpartitioned'),
       'Worker can access unpartitioned cookie via JS');
 
   // Test that the partitioned cookie is not available to this worker in HTTP
   // requests from importScripts.
-  wait_promise = new Promise(resolve => {
-    resolve_wait_promise = resolve;
-  });
-  on_message = ev => {
-    got = ev.data;
-    resolve_wait_promise();
-  };
   filtered_registrations[0].active.postMessage({type: 'echo_cookies_import'});
-  await wait_promise;
-  assert_true(got.ok, 'Get cookies');
+  const msg4 = await next_message();
+  assert_true(msg4.ok, 'Get cookies');
   assert_false(
-      got.cookies.includes('__Host-partitioned'),
+      msg4.cookies.includes('__Host-partitioned'),
       'Worker cannot access partitioned cookie via importScripts');
   assert_true(
-      got.cookies.includes('unpartitioned'),
+      msg4.cookies.includes('unpartitioned'),
       'Worker can access unpartitioned cookie via importScripts');
 });
 
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-sw.js b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-sw.js
index 767dbf44327..c9713b6c50c 100644
--- a/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-sw.js
+++ b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-3p-sw.js
@@ -1,53 +1,3 @@
-self.addEventListener('message', ev => ev.waitUntil(onMessage(ev)));
-
-async function onMessage(event) {
-  if (!event.data)
-    return;
-  switch (event.data.type) {
-    case 'test_message':
-      return onTestMessage(event);
-    case 'echo_cookies_http':
-      return onEchoCookiesHttp(event);
-    case 'echo_cookies_js':
-      return onEchoCookiesJs(event);
-    case 'echo_cookies_import':
-      return onEchoCookiesImport(event);
-    default:
-      return;
-  }
-}
-
-// test_message just verifies that the message passing is working.
-async function onTestMessage(event) {
-  event.source.postMessage({ok: true});
-}
-
-async function onEchoCookiesHttp(event) {
-  try {
-    const resp = await fetch(
-        `${self.origin}/cookies/resources/list.py`, {credentials: 'include'});
-    const cookies = await resp.json();
-    event.source.postMessage({ok: true, cookies: Object.keys(cookies)});
-  } catch (err) {
-    event.source.postMessage({ok: false});
-  }
-}
-
-// echo_cookies returns the names of all of the cookies available to the worker.
-async function onEchoCookiesJs(event) {
-  try {
-    const cookie_objects = await self.cookieStore.getAll();
-    const cookies = cookie_objects.map(c => c.name);
-    event.source.postMessage({ok: true, cookies});
-  } catch (err) {
-    event.source.postMessage({ok: false});
-  }
-}
-
-// Sets `self._cookies` variable, array of the names of cookies available to
-// the request.
-importScripts(`${self.origin}/cookies/resources/list-cookies-for-script.py`);
-
-function onEchoCookiesImport(event) {
-  event.source.postMessage({ok: true, cookies: self._cookies});
-}
+// Import the code from the 1P partitioned worker.
+// We use separate URLs for each worker script to keep their scopes unique.
+importScripts('./partitioned-cookies-sw.js');
diff --git a/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-test-helpers.js b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-test-helpers.js
new file mode 100644
index 00000000000..73f3b0bde06
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/resources/partitioned-cookies-test-helpers.js
@@ -0,0 +1,31 @@
+// Return a generator containing the worker's message.
+//
+// Usage:
+//   await navigator.serviceWorker.register(...)
+//   ...
+//   const nextMessage = worker_message_generator();
+//   const msg_1 = await nextMessage();
+//   const msg_2 = await nextMessage();
+//   const msg_3 = await nextMessage();
+//
+// Worker should have its own onmessage event listener that
+// postMessages replies to the DOM.
+function worker_message_generator() {
+  const buffer = [];
+  let resolve = null;
+
+  navigator.serviceWorker.addEventListener('message', message => {
+    buffer.push(message.data);
+    if (resolve) {
+      resolve();
+    }
+  });
+
+  return async function () {
+    if (buffer.length != 0) {
+      return buffer.shift();
+    }
+    await new Promise(r => resolve = r);
+    return buffer.shift();
+  }
+}
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text
new file mode 100644
index 00000000000..f3d9861c137
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text
@@ -0,0 +1 @@
+Network
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text.headers b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct1.text.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text
new file mode 100644
index 00000000000..f3d9861c137
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text
@@ -0,0 +1 @@
+Network
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text.headers b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/or-test/direct2.text.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
index e95bdadaddb..0cde9200c75 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/resources/static-router-sw.js
@@ -4,21 +4,30 @@ var requests = [];
 
 self.addEventListener('install', e => {
   e.registerRouter([
-    {
-      condition: { requestMode: 'no-cors' },
-      source: 'network'
-    },
-    {
-      condition: { urlPattern: '/**/*.txt??*' },
+    {condition: {requestMode: 'no-cors'}, source: 'network'}, {
+      condition: {urlPattern: '/**/*.txt??*'},
       // Note: "??*" is for allowing arbitrary query strings.
       // Upon my experiment, the URLPattern needs two '?'s for specifying
       // a coming string as a query.
       source: 'network'
-    }, {
-      condition: {
-        urlPattern: '/**/simple-test-for-condition-main-resource.html'},
+    },
+    {
+      condition:
+          {urlPattern: '/**/simple-test-for-condition-main-resource.html'},
       source: 'network'
-    }]);
+    },
+    {
+      condition: {
+        or: [
+          {
+            or: [{urlPattern: '/**/or-test/direct1.*??*'}],
+          },
+          {urlPattern: '/**/or-test/direct2.*??*'}
+        ]
+      },
+      source: 'network'
+    }
+  ]);
   self.skipWaiting();
 });
 
diff --git a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
index 7d956363e68..42e4da8ed53 100644
--- a/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
+++ b/tests/wpt/tests/service-workers/service-worker/tentative/static-router/static-router-subresource.https.html
@@ -11,6 +11,13 @@ const SCOPE = 'resources/';
 const HTML_FILE = 'resources/simple.html';
 const TXT_FILE = 'resources/direct.txt';
 const CSV_FILE = 'resources/simple.csv';
+// Warning: please prepare the corresponding `*.text.headers` files, otherwise
+// iframeTest() fails to load the following files due to MIME mismatches.
+const OR_TEST_FILES = [
+  'resources/or-test/direct1.text',
+  'resources/or-test/direct2.text',
+  'resources/or-test/does-not-exist.text',
+];
 
 // Register a service worker, then create an iframe at url.
 function iframeTest(url, callback, name) {
@@ -51,5 +58,23 @@ iframeTest(CSV_FILE, async (t, iwin) => {
   assert_equals(await response.text(), "matched,with,non-url,conditions\n");
 }, 'Subresource load matched with RequestMode condition');
 
+iframeTest(OR_TEST_FILES[0], async (t, iwin) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd);
+  assert_equals(await response.text(), "Network\n");
+}, 'Subresource load matched with the nested `or` condition');
+
+iframeTest(OR_TEST_FILES[1], async (t, iwin) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd);
+  assert_equals(await response.text(), "Network\n");
+}, 'Subresource load matched with the next `or` condition');
+
+iframeTest(OR_TEST_FILES[2], async (t, iwin) => {
+  const rnd = randomString();
+  const response = await iwin.fetch('?nonce=' + rnd);
+  assert_equals(await response.text(), rnd);
+}, 'Subresource load not matched with `or` condition');
+
 </script>
 </body>
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-after-attachshadow.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-after-attachshadow.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-after-attachshadow.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-after-attachshadow.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-parser-interaction.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-parser-interaction.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-parser-interaction.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-parser-interaction.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.html
similarity index 99%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.html
index d752b62d31d..dcee6cf8a10 100644
--- a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.tentative.html
+++ b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-attachment.html
@@ -19,7 +19,7 @@ function addDeclarativeShadowRoot(elementType, mode, delegatesFocus) {
   const declarativeString = `<${elementType} id=theelement>${getDeclarativeContent(mode, delegatesFocus)}
      <span class='lightdom'>${lightDomTextContent}</span></${elementType}>`;
   const wrapper = document.createElement('div');
-  setInnerHTML(wrapper, declarativeString);
+  wrapper.setHTMLUnsafe(declarativeString);
   const element = wrapper.querySelector('#theelement');
   return {wrapper: wrapper, element: element};
 }
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
similarity index 97%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
index b71f7d1a377..6f3739b63ca 100644
--- a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.tentative.html
+++ b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-basic.html
@@ -5,7 +5,6 @@
 <link rel="help" href="https://github.com/whatwg/dom/issues/831">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
-<script src="support/helpers.js"></script>
 
 <div id="host" style="display:none">
   <template shadowrootmode="open">
@@ -40,14 +39,14 @@ test(() => {
   t.setAttribute('shadowrootmode','OpEn');
   assert_equals(t.shadowRootMode,'open','Case insensitive');
   t.setAttribute('shadowrootmode','INVALID');
-  assert_equals(t.shadowRootMode,null,'Invalid values map to null');
+  assert_equals(t.shadowRootMode,'','Invalid values map to empty string');
   t.removeAttribute('shadowrootmode');
-  assert_equals(t.shadowRootMode,null,'No shadowrootmode attribute maps to null');
+  assert_equals(t.shadowRootMode,'','No shadowrootmode attribute maps to empty string');
 }, 'Shadowrootmode reflection');
 
 test(() => {
   const div = document.createElement('div');
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="open">
         <slot id="s1" name="slot1"></slot>
@@ -68,7 +67,7 @@ test(() => {
 
 test(() => {
   const div = document.createElement('div');
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="invalid">
       </template>
@@ -84,7 +83,7 @@ test(() => {
 
 test(() => {
   const div = document.createElement('div');
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="closed">
       </template>
@@ -97,7 +96,7 @@ test(() => {
 
 test(() => {
   const div = document.createElement('div');
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="open">
         <slot id="s1" name="slot1"></slot>
@@ -113,7 +112,7 @@ test(() => {
 
 test(() => {
   const div = document.createElement('div');
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="open" shadowrootdelegatesfocus>
       </template>
@@ -122,7 +121,7 @@ test(() => {
   var host = div.querySelector('#host');
   assert_true(!!host.shadowRoot,"No shadow root found");
   assert_true(host.shadowRoot.delegatesFocus,"delegatesFocus should be true");
-  setInnerHTML(div,`
+  div.setHTMLUnsafe(`
     <div id="host">
       <template shadowrootmode="open">
       </template>
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-shadow-dom-opt-in.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/declarative-with-disabled-shadow.tentative.html b/tests/wpt/tests/shadow-dom/declarative/declarative-with-disabled-shadow.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/declarative-with-disabled-shadow.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/declarative-with-disabled-shadow.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/getinnerhtml.tentative.html b/tests/wpt/tests/shadow-dom/declarative/getinnerhtml.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/getinnerhtml.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/getinnerhtml.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/innerhtml-before-closing-tag.tentative.html b/tests/wpt/tests/shadow-dom/declarative/innerhtml-before-closing-tag.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/innerhtml-before-closing-tag.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/innerhtml-before-closing-tag.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/innerhtml-on-ordinary-template.tentative.html b/tests/wpt/tests/shadow-dom/declarative/innerhtml-on-ordinary-template.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/innerhtml-on-ordinary-template.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/innerhtml-on-ordinary-template.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/move-template-before-closing-tag.tentative.html b/tests/wpt/tests/shadow-dom/declarative/move-template-before-closing-tag.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/move-template-before-closing-tag.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/move-template-before-closing-tag.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/script-access.tentative.html b/tests/wpt/tests/shadow-dom/declarative/script-access.html
similarity index 100%
rename from tests/wpt/tests/shadow-dom/declarative/script-access.tentative.html
rename to tests/wpt/tests/shadow-dom/declarative/script-access.html
diff --git a/tests/wpt/tests/shadow-dom/declarative/support/helpers.js b/tests/wpt/tests/shadow-dom/declarative/support/helpers.js
deleted file mode 100644
index 0be3add6200..00000000000
--- a/tests/wpt/tests/shadow-dom/declarative/support/helpers.js
+++ /dev/null
@@ -1,4 +0,0 @@
-function setInnerHTML(el,content) {
-  const fragment = (new DOMParser()).parseFromString(`<pre>${content}</pre>`, 'text/html', {includeShadowRoots: true});
-  (el instanceof HTMLTemplateElement ? el.content : el).replaceChildren(...fragment.body.firstChild.childNodes);
-}
diff --git a/tests/wpt/tests/shared-storage/resources/shared-storage-write-notify-parent.py b/tests/wpt/tests/shared-storage/resources/shared-storage-write-notify-parent.py
index 0f72fb728c4..63041218c8d 100644
--- a/tests/wpt/tests/shared-storage/resources/shared-storage-write-notify-parent.py
+++ b/tests/wpt/tests/shared-storage/resources/shared-storage-write-notify-parent.py
@@ -7,7 +7,7 @@ def unescape_query_value(query_value_bytes):
 
 def main(request, response):
     writable_header = request.headers.get(
-        b"Shared-Storage-Writable",
+        b"Sec-Shared-Storage-Writable",
         b"NO_SHARED_STORAGE_WRITABLE_HEADER")
     response.headers.append(b"Content-Type", b"text/html")
     response.headers.append(b"Access-Control-Allow-Origin", b"*")
diff --git a/tests/wpt/tests/shared-storage/resources/shared-storage-write.py b/tests/wpt/tests/shared-storage/resources/shared-storage-write.py
index 8770b11f09d..fabe1eba268 100644
--- a/tests/wpt/tests/shared-storage/resources/shared-storage-write.py
+++ b/tests/wpt/tests/shared-storage/resources/shared-storage-write.py
@@ -7,7 +7,7 @@ def unescape_query_value(query_value_bytes):
 
 def main(request, response):
     writable_header = request.headers.get(
-        b"Shared-Storage-Writable",
+        b"Sec-Shared-Storage-Writable",
         b"NO_SHARED_STORAGE_WRITABLE_HEADER")
     response.headers.append(b"Access-Control-Allow-Origin", b"*")
     if writable_header == b"?1" and b'write' in request.GET:
diff --git a/tests/wpt/tests/shared-storage/run-operation.tentative.https.sub.html b/tests/wpt/tests/shared-storage/run-operation.tentative.https.sub.html
index c6c70805f11..1ef0d25b48f 100644
--- a/tests/wpt/tests/shared-storage/run-operation.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/run-operation.tentative.https.sub.html
@@ -1,16 +1,19 @@
 <!doctype html>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
+<script src="/shared-storage/resources/util.js"></script>
 
 <body>
 <script>
 'use strict';
 
-promise_test(() => {
+promise_test(async t => {
+  await addModuleOnce("/shared-storage/resources/simple-module.js");
   return sharedStorage.run("operation1", {keepAlive: true});
 }, 'run()');
 
-promise_test(() => {
+promise_test(async t => {
+  await addModuleOnce("/shared-storage/resources/simple-module.js");
   return sharedStorage.run("operation1",
                            {data: {'custom-key': 'custom-value'},
                             keepAlive: true});
@@ -18,6 +21,7 @@ promise_test(() => {
 
 promise_test(async t => {
   try {
+    await addModuleOnce("/shared-storage/resources/simple-module.js");
     await sharedStorage.run("operation1", {data: window});
   } catch (e) {
     assert_equals(e.name, 'DataCloneError');
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 0626684b677..8041a9c5535 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
@@ -15,136 +15,6 @@ for (const resolve_to_config of [true, false]) {
           {resolveToConfig: resolve_to_config, keepAlive: true}));
   }, 'selectURL() without addModule, ' +
      'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-      try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation",
-            [{url: "1"}, {url: "2"}, {url: "3"}, {url: "4"}, {url: "5"},
-             {url: "6"}, {url: "7"}, {url: "8"}, {url: "9"}],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-      assert_equals(e.message, 'Length of the \"urls\" parameter is not valid.');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with urls array length too big, ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-          "test-url-selection-operation",
-          [],
-          {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-      assert_equals(e.message, 'Length of the \"urls\" parameter is not valid.');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with empty urls array, ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation", [{
-                reportingMetadata: {
-                    'click': "https://google.com"
-                }
-            }],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'TypeError');
-        assert_equals(true, e.message.startsWith(
-            'Failed to execute \'selectURL\' on \'SharedStorage\': ' +
-            'Failed to read the \'url\' property from ' +
-            '\'SharedStorageUrlWithMetadata\':') &&
-            e.message.endsWith('Failed to read the \'url\' property from ' +
-            '\'SharedStorageUrlWithMetadata\': Required member is undefined.'));
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with missing url, ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation", [{
-                url: "https://#"
-            }],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-        assert_equals(e.message,
-                      'The url \"https://#\" is invalid.');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with invalid url, ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation", [{
-                url: "/shared-storage/resources/frame0.html",
-                reportingMetadata: {
-                    'click': "https://#"
-                }
-            }],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-        assert_equals(e.message,
-                      'The metadata for the url at index 0 has an invalid ' +
-                      'or non-HTTPS report_url parameter \"https://#\".');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with invalid report url ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation", [{
-                url: "/shared-storage/resources/frame0.html",
-                reportingMetadata: {
-                    'click': "http://google.com"
-                }
-            }],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-        assert_equals(e.message, 'The metadata for the url at index 0 has an ' +
-            'invalid or non-HTTPS report_url parameter \"http://google.com\".');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with http report url, ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
-
-  promise_test(async t => {
-    try {
-        await sharedStorage.selectURL(
-            "test-url-selection-operation", [{
-                url: "/shared-storage/resources/frame0.html",
-                reportingMetadata: {}
-            }],
-            {resolveToConfig: resolve_to_config, keepAlive: true});
-    } catch (e) {
-      assert_equals(e.name, 'DataError');
-        assert_equals(e.message, 'selectURL could not get reportingMetadata ' +
-                                 'object attributes');
-      return;
-    }
-    assert_unreached("did not reject");
-  }, 'selectURL() with invalid reportingMetadata ' +
-     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
 }
 
 </script>
diff --git a/tests/wpt/tests/shared-storage/run-url-selection-operation.tentative.https.sub.html b/tests/wpt/tests/shared-storage/run-url-selection-operation.tentative.https.sub.html
index 68f420a8a79..01cb9fdd396 100644
--- a/tests/wpt/tests/shared-storage/run-url-selection-operation.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/run-url-selection-operation.tentative.https.sub.html
@@ -46,6 +46,143 @@ for (const resolve_to_config of [true, false]) {
     const result2 = await nextValueFromServer(ancestor_key);
     assert_equals(result2, "frame0_loaded");
   }, 'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation",
+            [{url: "1"}, {url: "2"}, {url: "3"}, {url: "4"}, {url: "5"},
+             {url: "6"}, {url: "7"}, {url: "8"}, {url: "9"}],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+      assert_equals(e.message, 'Length of the \"urls\" parameter is not valid.');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with urls array length too big, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+          "test-url-selection-operation",
+          [],
+          {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+      assert_equals(e.message, 'Length of the \"urls\" parameter is not valid.');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with empty urls array, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation", [{
+                reportingMetadata: {
+                    'click': "https://google.com"
+                }
+            }],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'TypeError');
+        assert_equals(true, e.message.startsWith(
+            'Failed to execute \'selectURL\' on \'SharedStorage\': ' +
+            'Failed to read the \'url\' property from ' +
+            '\'SharedStorageUrlWithMetadata\':') &&
+            e.message.endsWith('Failed to read the \'url\' property from ' +
+            '\'SharedStorageUrlWithMetadata\': Required member is undefined.'));
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with missing url, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation", [{
+                url: "https://#"
+            }],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+        assert_equals(e.message,
+                      'The url \"https://#\" is invalid.');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with invalid url, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation", [{
+                url: "/shared-storage/resources/frame0.html",
+                reportingMetadata: {
+                    'click': "https://#"
+                }
+            }],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+        assert_equals(e.message,
+                      'The metadata for the url at index 0 has an invalid ' +
+                      'or non-HTTPS report_url parameter \"https://#\".');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with invalid report url ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation", [{
+                url: "/shared-storage/resources/frame0.html",
+                reportingMetadata: {
+                    'click': "http://google.com"
+                }
+            }],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+        assert_equals(e.message, 'The metadata for the url at index 0 has an ' +
+            'invalid or non-HTTPS report_url parameter \"http://google.com\".');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with http report url, ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
+
+  promise_test(async t => {
+    try {
+      await addModuleOnce("/shared-storage/resources/simple-module.js");
+      await sharedStorage.selectURL(
+            "test-url-selection-operation", [{
+                url: "/shared-storage/resources/frame0.html",
+                reportingMetadata: {}
+            }],
+            {resolveToConfig: resolve_to_config, keepAlive: true});
+    } catch (e) {
+      assert_equals(e.name, 'DataError');
+        assert_equals(e.message, 'selectURL could not get reportingMetadata ' +
+                                 'object attributes');
+      return;
+    }
+    assert_unreached("did not reject");
+  }, 'selectURL() with invalid reportingMetadata ' +
+     'selectURL() resolves to ' + (resolve_to_config ? 'config' : 'urn:uuid'));
 }
 
 </script>
diff --git a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-default.tentative.https.sub.html b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-default.tentative.https.sub.html
index 4dae771f3f9..6dc2435b934 100644
--- a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-default.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-default.tentative.https.sub.html
@@ -24,8 +24,9 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', sameOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the same-origin shared storage fetch request.');
+      await deleteKeyForOrigin('hello', sameOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the same-origin shared storage fetch request.');
 
     promise_test(async t => {
       let response = await fetch(crossOriginUrl,
@@ -34,8 +35,9 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', crossOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the cross-origin shared storage fetch request.');
+      await deleteKeyForOrigin('hello', crossOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the cross-origin shared storage fetch request.');
 
     promise_test(async t => {
       let response = await fetch('/common/redirect.py?location='
@@ -45,8 +47,9 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', sameOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the redirect of a shared storage fetch request, '
+      await deleteKeyForOrigin('hello', sameOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the redirect of a shared storage fetch request, '
               + 'where the redirect has a same-origin URL.');
 
     promise_test(async t => {
@@ -57,8 +60,9 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', crossOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the redirect of a shared storage fetch request, '
+      await deleteKeyForOrigin('hello', crossOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the redirect of a shared storage fetch request, '
               + 'where the redirect has a cross-origin URL.');
   </script>
 </body>
diff --git a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-none.tentative.https.sub.html b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-none.tentative.https.sub.html
index 7f9584e6146..1a1e4076ca2 100644
--- a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-none.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-none.tentative.https.sub.html
@@ -18,8 +18,8 @@
       let sharedStorageWritableHeader = await response.text();
       assert_equals(sharedStorageWritableHeader,
                     "NO_SHARED_STORAGE_WRITABLE_HEADER");
-    }, header + ' disallows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the same-origin shared storage fetch request.');
+    }, header + ' disallows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the same-origin shared storage fetch request.');
 
     promise_test(async t => {
       let response = await fetch(crossOriginUrl,
@@ -27,7 +27,7 @@
       let sharedStorageWritableHeader = await response.text();
       assert_equals(sharedStorageWritableHeader,
                     "NO_SHARED_STORAGE_WRITABLE_HEADER");
-    }, header + ' disallows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the cross-origin shared storage fetch request.');
+    }, header + ' disallows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the cross-origin shared storage fetch request.');
   </script>
 </body>
diff --git a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-self.tentative.https.sub.html b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-self.tentative.https.sub.html
index ca5ae16eff2..50d5c65cd55 100644
--- a/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-self.tentative.https.sub.html
+++ b/tests/wpt/tests/shared-storage/shared-storage-writable-permissions-policy-self.tentative.https.sub.html
@@ -25,7 +25,8 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', sameOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
+      await deleteKeyForOrigin('hello', sameOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be sent '
               + 'for the same-origin shared storage fetch request.');
 
     promise_test(async t => {
@@ -34,8 +35,8 @@
       let sharedStorageWritableHeader = await response.text();
       assert_equals(sharedStorageWritableHeader,
                     "NO_SHARED_STORAGE_WRITABLE_HEADER");
-    }, header + ' disallows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the cross-origin shared storage fetch request.');
+    }, header + ' disallows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the cross-origin shared storage fetch request.');
 
     promise_test(async t => {
       let response = await fetch('/common/redirect.py?location='
@@ -45,8 +46,9 @@
       assert_equals(sharedStorageWritableHeader, "?1");
 
       await verifyKeyValueForOrigin('hello', 'world', sameOrigin);
-    }, header + ' allows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the redirect of a shared storage fetch request, '
+      await deleteKeyForOrigin('hello', sameOrigin);
+    }, header + ' allows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the redirect of a shared storage fetch request, '
               + 'where the redirect has a same-origin URL.');
 
     promise_test(async t => {
@@ -56,8 +58,8 @@
       let sharedStorageWritableHeader = await response.text();
       assert_equals(sharedStorageWritableHeader,
                     "NO_SHARED_STORAGE_WRITABLE_HEADER");
-    }, header + ' disallows the \'Shared-Storage-Writable\' header to be sent '
-              + 'for the redirect of a shared storage fetch request, '
+    }, header + ' disallows the \'Sec-Shared-Storage-Writable\' header to be '
+              + 'sent for the redirect of a shared storage fetch request, '
               + 'where the redirect has a cross-origin URL.');
   </script>
 </body>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/image-lcp-followed-by-two-image-softnavs-lcp.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/image-lcp-followed-by-two-image-softnavs-lcp.tentative.html
index 0e1b9a4d679..66a9e5136f6 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/image-lcp-followed-by-two-image-softnavs-lcp.tentative.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/image-lcp-followed-by-two-image-softnavs-lcp.tentative.html
@@ -19,9 +19,6 @@
     const link = document.getElementById("link");
 
     promise_test(async t => {
-      if (!performance.softNavPaintMetricsSupported) {
-        return;
-      }
       validatePaintEntries('first-contentful-paint', 1);
       validatePaintEntries('first-paint', 1);
       const preClickLcp = await getLcpEntries();
diff --git a/tests/wpt/tests/soft-navigation-heuristics/innertext.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/innertext.tentative.html
new file mode 100644
index 00000000000..d40b6047924
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/innertext.tentative.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/soft-navigation-helper.js"></script>
+</head>
+<body>
+  <main id=main>
+  <a id=link>Click me!</a>
+  <!-- This test fails if the paragraph below already has content. The reason
+       is that secondary paints are not being properly recorded, and hence don't
+       count for soft navigation heuristics. -->
+  <p id="softnav-content"></p>
+  </main>
+  <script>
+    const link = document.getElementById("link");
+    testSoftNavigation({
+      addContent: async () => {
+        document.getElementById("softnav-content").innerText =
+          "Lorem Ipsum dolor sit amet";
+      },
+      link: link,
+      test: "Soft navigation when only innerText was modified"});
+  </script>
+</body>
+</html>
+
+
diff --git a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
index 1116ebccb35..6fdc1d100b9 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
+++ b/tests/wpt/tests/soft-navigation-heuristics/resources/soft-navigation-helper.js
@@ -21,24 +21,24 @@ const testSoftNavigation =
       const pushUrl = readValue(options.pushUrl, true);
       const eventType = readValue(options.eventType, "click");
       const interactionType = readValue(options.interactionType, 'click');
-      const expectLCP = options.validate != 'no-lcp';
       const eventPrepWork = options.eventPrepWork;
       promise_test(async t => {
         await waitInitialLCP();
         const preClickLcp = await getLcpEntries();
-        setEvent(t, link, pushState, addContent, pushUrl, eventType, eventPrepWork);
+        setEvent(t, link, pushState, addContent, pushUrl, eventType,
+                 eventPrepWork);
+        let first_navigation_id;
         for (let i = 0; i < clicks; ++i) {
           const firstClick = (i === 0);
           let paint_entries_promise =
-              waitOnPaintEntriesPromise(expectLCP && firstClick);
+              waitOnPaintEntriesPromise(firstClick);
           interacted = false;
           interact(link, interactionType);
 
-          await new Promise(resolve => {
-            (new PerformanceObserver(() => resolve())).observe({
-              type: 'soft-navigation'
-            });
-          });
+          const navigation_id = await waitOnSoftNav();
+          if (!first_navigation_id) {
+            first_navigation_id = navigation_id;
+          }
           // Ensure paint timing entries are fired before moving on to the next
           // click.
           await paint_entries_promise;
@@ -49,7 +49,7 @@ const testSoftNavigation =
         await validateSoftNavigationEntry(
             clicks, extraValidations, pushUrl);
 
-        await runEntryValidations(preClickLcp, clicks + 1, expectLCP);
+        await runEntryValidations(preClickLcp, first_navigation_id, clicks + 1, options.validate);
       }, testName);
     };
 
@@ -64,17 +64,13 @@ const testNavigationApi = (testName, navigateEventHandler, link) => {
     const preClickLcp = await getLcpEntries();
     let paint_entries_promise = waitOnPaintEntriesPromise();
     interact(link);
-    await new Promise(resolve => {
-      (new PerformanceObserver(() => resolve())).observe({
-        type: 'soft-navigation'
-      });
-    });
+    const first_navigation_id = await waitOnSoftNav();
     await navigated;
     await paint_entries_promise;
     assert_equals(document.softNavigations, 1, 'Soft Navigation detected');
     await validateSoftNavigationEntry(1, () => {}, 'foobar.html');
 
-    await runEntryValidations(preClickLcp);
+    await runEntryValidations(preClickLcp, first_navigation_id);
   }, testName);
 };
 
@@ -102,37 +98,34 @@ const testSoftNavigationNotDetected = options => {
   };
 
 const runEntryValidations =
-    async (preClickLcp, entries_expected_number = 2, expect_lcp = true) => {
-  await validatePaintEntries('first-contentful-paint', entries_expected_number);
-  await validatePaintEntries('first-paint', entries_expected_number);
+    async (preClickLcp, first_navigation_id, entries_expected_number = 2,
+           validate = null) => {
+  await validatePaintEntries('first-contentful-paint', entries_expected_number,
+                             first_navigation_id);
+  await validatePaintEntries('first-paint', entries_expected_number,
+                             first_navigation_id);
   const postClickLcp = await getLcpEntries();
   const postClickLcpWithoutSoftNavs = await getLcpEntriesWithoutSoftNavs();
-  if (expect_lcp) {
-    assert_greater_than(
-        postClickLcp.length, preClickLcp.length,
-        'Soft navigation should have triggered at least an LCP entry');
-  } else {
-    assert_equals(
-        postClickLcp.length, preClickLcp.length,
-        'Soft navigation should not have triggered an LCP entry');
+  assert_greater_than(
+      postClickLcp.length, preClickLcp.length,
+      'Soft navigation should have triggered at least an LCP entry');
+
+  if (validate) {
+    await validate();
   }
   assert_equals(
       postClickLcpWithoutSoftNavs.length, preClickLcp.length,
       'Soft navigation should not have triggered an LCP entry when the ' +
       'observer did not opt in');
-  if (expect_lcp) {
-    assert_not_equals(
-        postClickLcp[postClickLcp.length - 1].size,
-        preClickLcp[preClickLcp.length - 1].size,
-        'Soft navigation LCP element should not have identical size to the hard ' +
-            'navigation LCP element');
-  } else {
-    assert_equals(
-        postClickLcp[postClickLcp.length - 1].size,
-        preClickLcp[preClickLcp.length - 1].size,
-        'Soft navigation LCP element should have an identical size to the hard ' +
-            'navigation LCP element');
-  }
+  assert_not_equals(
+      postClickLcp[postClickLcp.length - 1].size,
+      preClickLcp[preClickLcp.length - 1].size,
+      'Soft navigation LCP element should not have identical size to the hard ' +
+          'navigation LCP element');
+  assert_equals(
+      postClickLcp[preClickLcp.length].navigationId,
+      first_navigation_id, 'Soft navigation LCP should have the same navigation ' +
+      'ID as the last soft nav entry')
 };
 
 const interact =
@@ -214,7 +207,7 @@ const validateSoftNavigationEntry = async (clicks, extraValidations,
 
 };
 
-const validatePaintEntries = async (type, entries_number) => {
+const validatePaintEntries = async (type, entries_number, first_navigation_id) => {
   if (!performance.softNavPaintMetricsSupported) {
     return;
   }
@@ -242,6 +235,12 @@ const validatePaintEntries = async (type, entries_number) => {
     assert_not_equals(entries[0].startTime, entries[1].startTime,
       "Entries have different timestamps for " + type);
   }
+  if (expected_entries_number > entries_without_softnavs.length) {
+    assert_equals(entries[entries_without_softnavs.length].navigationId,
+      first_navigation_id,
+      "First paint entry should have the same navigation ID as the last soft " +
+      "navigation entry");
+  }
 };
 
 const waitInitialLCP = () => {
@@ -253,6 +252,19 @@ const waitInitialLCP = () => {
   });
 }
 
+const waitOnSoftNav = () => {
+  return new Promise(resolve => {
+    (new PerformanceObserver(list => {
+       const entries = list.getEntries();
+       assert_equals(entries.length, 1,
+                     "Only one soft navigation entry");
+       resolve(entries[0].navigationId);
+    })).observe({
+      type: 'soft-navigation'
+    });
+  });
+};
+
 const getLcpEntries = async () => {
   const entries = await new Promise(resolve => {
     (new PerformanceObserver(list => resolve(
@@ -272,30 +284,41 @@ const getLcpEntriesWithoutSoftNavs = async () => {
   return entries;
 };
 
-const addImage = async (element) => {
+const addImage = async (element, url="blue.png") => {
   const img = new Image();
-  img.src = '/images/blue.png' + "?" + Math.random();
+  img.src = '/images/'+ url + "?" + Math.random();
   img.id="imagelcp";
   await img.decode();
   element.appendChild(img);
 };
-const addImageToMain = async () => {
-  await addImage(document.getElementById('main'));
+const addImageToMain = async (url="blue.png") => {
+  await addImage(document.getElementById('main'), url);
 };
 
-const addTextToDivOnMain =
-    () => {
-      const main = document.getElementById("main");
-      const prevDiv = document.getElementsByTagName("div")[0];
-      if (prevDiv) {
-        main.removeChild(prevDiv);
-      }
-      const div = document.createElement("div");
-      const text = document.createTextNode("Lorem Ipsum");
-      div.appendChild(text);
-      div.style = "font-size: 3em";
-      main.appendChild(div);
-    }
+const addTextParagraphToMain = (text, element_timing = "") => {
+  const main = document.getElementById("main");
+  const p = document.createElement("p");
+  const textNode = document.createTextNode(text);
+  p.appendChild(textNode);
+  if (element_timing) {
+    p.setAttribute("elementtiming", element_timing);
+  }
+  p.style = "font-size: 3em";
+  main.appendChild(p);
+  return p;
+};
+const addTextToDivOnMain = () => {
+  const main = document.getElementById("main");
+  const prevDiv = document.getElementsByTagName("div")[0];
+  if (prevDiv) {
+    main.removeChild(prevDiv);
+  }
+  const div = document.createElement("div");
+  const text = document.createTextNode("Lorem Ipsum");
+  div.appendChild(text);
+  div.style = "font-size: 3em";
+  main.appendChild(div);
+}
 
 const waitOnPaintEntriesPromise = (expectLCP = true) => {
   return new Promise((resolve, reject) => {
diff --git a/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint-larger-than-viewport.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint-larger-than-viewport.tentative.html
new file mode 100644
index 00000000000..3c930d8be4c
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint-larger-than-viewport.tentative.html
@@ -0,0 +1,70 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<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="/soft-navigation-heuristics/resources/soft-navigation-helper.js"></script>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+</head>
+<body>
+  <main id=main>
+    <div>
+      <a id=link><img id="initial_image1" src="/images/lcp-256x256.png?1" style="width: 90vw; height: 90vh">
+        <div id=extra></div>
+      </a>
+    </div>
+  </main>
+  <script>
+  (async () => {
+    const link = document.getElementById("link");
+
+    // Inject a second image that takes a large part of the viewport.
+    await new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(() => {
+        document.getElementById("extra").innerHTML = `
+          <div style="position: absolute; bottom: 0; right: 0">
+            <img id="initial_image2" src="/images/lcp-256x256.png?2" style="width: 90vw;height: 90vh">
+          </div>`;
+        resolve();
+      }));
+    });
+    // Wait until the second image is rendered.
+    await new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(() => {
+        resolve();
+      }));
+    });
+    testSoftNavigation({
+      addContent: async () => {
+        // Remove the initial image, so that the text would be painted on screen.
+        document.getElementById("initial_image1").remove();
+        document.getElementById("initial_image2").remove();
+        let lcp_element_painted;
+        const lcp_element_paint_promise = new Promise((r) => { lcp_element_painted = r; });
+        // Add an LCP element, but have it be small enough to not trigger the
+        // Soft Navigation heuristics.
+        const p = addTextParagraphToMain(
+          "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod",
+          /*element_timing=*/"lcp");
+        (new PerformanceObserver(list => {
+          // Once the first element is fully painted:
+          lcp_element_painted();
+        })).observe({type: "element", buffered: true});
+        await lcp_element_paint_promise;
+        // Add a smaller element that gets us over that threshold.
+        addTextParagraphToMain("dolore magna aliqua.");
+      },
+      link: link,
+      test: "Test that an image LCP followed by a smaller soft navigation LCP"
+        + " properly queues an LCP entry, even when the soft navigation is"
+        + " detected after the LCP, even when initial paints significantly"
+        + " exceed the viewport dimensions."});
+  })();
+  </script>
+</body>
+</html>
+
+
diff --git a/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint.tentative.html
new file mode 100644
index 00000000000..cf9a9942ca6
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/softnav-after-lcp-paint.tentative.html
@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect simple soft navigation.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/soft-navigation-helper.js"></script>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+</head>
+<body>
+  <main id=main>
+    <div>
+      <a id=link><img src="/images/lcp-256x256.png"></a>
+    </div>
+  </main>
+  <script>
+    const link = document.getElementById("link");
+    testSoftNavigation({
+      addContent: async () => {
+        let lcp_element_painted;
+        const lcp_element_paint_promise = new Promise((r) => { lcp_element_painted = r; });
+        // Add an LCP element, but have it be small enough to not trigger the
+        // Soft Navigation heuristics.
+        const p = addTextParagraphToMain("Lorem Ipsu", /*element_timing=*/"lcp");
+        (new PerformanceObserver(list => {
+          // Once the first element is fully painted:
+          lcp_element_painted();
+        })).observe({type: "element", buffered: true});
+        await lcp_element_paint_promise;
+        // Add a smaller element that gets us over that threshold.
+        addTextParagraphToMain("m");
+      },
+      link: link,
+      test: "Test that an image LCP followed by a smaller soft navigation LCP"
+        + " properly queues an LCP entry, even when the soft navigation is"
+        + " detected after the LCP."});
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/softnav-before-lcp-paint.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/softnav-before-lcp-paint.tentative.html
new file mode 100644
index 00000000000..d5dc4b74fb3
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/softnav-before-lcp-paint.tentative.html
@@ -0,0 +1,52 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect simple soft navigation.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/soft-navigation-helper.js"></script>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+</head>
+<body>
+  <main id=main>
+    <div>
+      <a id=link><img src="/images/lcp-256x256.png"></a>
+    </div>
+  </main>
+  <script>
+    const link = document.getElementById("link");
+    testSoftNavigation({
+      addContent: async () => {
+        // Add an LCP element, large enough to trigger the Soft Navigation
+        // heuristics.
+        const p = addTextParagraphToMain("Lorem Ipsum", /*element_timing=*/"lcp");
+        p.id = "first_lcp";
+        // Once the first element is fully painted.
+        const observer = new PerformanceObserver(list => {
+          // Add a larger element to be the new LCP.
+          window.lcp_observer_promise = new Promise(resolve => {
+            (new PerformanceObserver(resolve)).observe({type: "element"});
+          });
+          const p2 = addTextParagraphToMain("LOREM IPSUMER", "real_lcp");
+          p2.id = "real_lcp";
+          observer.disconnect();
+        });
+        observer.observe({type: "element", buffered: true});
+      },
+      link: link,
+      validate: async () => {
+        await window.lcp_observer_promise;
+        const lcps = await getLcpEntries();
+        assert_greater_than_equal(lcps.length, 3, "Got at least 3 LCP entries");
+        assert_equals(lcps[lcps.length - 2].id, "first_lcp", "Got the first LCP");
+        assert_equals(lcps[lcps.length - 1].id, "real_lcp", "Got the real LCP");
+      },
+      test: "Test that an image LCP followed by 2 smaller soft navigation LCPs"
+        + " properly queues both LCP entries, even when the soft navigation"
+        + " is detected in between them."});
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/softnav-between-lcp-render-and-paint.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/softnav-between-lcp-render-and-paint.tentative.html
new file mode 100644
index 00000000000..56c7073de63
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/softnav-between-lcp-render-and-paint.tentative.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect simple soft navigation.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/soft-navigation-helper.js"></script>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+</head>
+<body>
+  <main id=main>
+    <div>
+      <a id=link><img src="/images/lcp-256x256.png"></a>
+    </div>
+  </main>
+  <script>
+    const link = document.getElementById("link");
+    testSoftNavigation({
+      addContent: async () => {
+        // Add an LCP element, but have it be small enough to not trigger the
+        // Soft Navigation heuristics.
+        const p = addTextParagraphToMain("Lorem Ipsu");
+        requestAnimationFrame(() => {
+          const p2 = addTextParagraphToMain("m");
+        });
+      },
+      link: link,
+      test: "Test that an image LCP followed by a smaller soft navigation LCP"
+        + " properly queues an LCP entry, even when the soft navigation is"
+        + " detected between the LCP's render and paint."});
+  </script>
+</body>
+</html>
diff --git a/tests/wpt/tests/soft-navigation-heuristics/text-lcp-followed-by-anim-image-softnav-lcp.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/text-lcp-followed-by-anim-image-softnav-lcp.tentative.html
new file mode 100644
index 00000000000..0615b513e61
--- /dev/null
+++ b/tests/wpt/tests/soft-navigation-heuristics/text-lcp-followed-by-anim-image-softnav-lcp.tentative.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Detect simple soft navigation.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/soft-navigation-helper.js"></script>
+</head>
+<body>
+  <main id=main>
+    <div>
+      <a id=link style="font-size: 4em">Click me!</a>
+    </div>
+  </main>
+  <script>
+    const link = document.getElementById("link");
+    testSoftNavigation({
+      addContent: async () => {
+        const main = document.getElementById("main");
+        main.removeChild(document.getElementsByTagName("div")[0]);
+        await addImageToMain("anim-gr.png");
+      },
+      link: link,
+      test: "Test that a text LCP followup by a smaller soft navigation image"
+        + " LCP properly queues an LCP entry"});
+  </script>
+</body>
+</html>
+
diff --git a/tests/wpt/tests/soft-navigation-heuristics/visited-link.tentative.html b/tests/wpt/tests/soft-navigation-heuristics/visited-link.tentative.html
index e81c6f61734..0bb149f00e9 100644
--- a/tests/wpt/tests/soft-navigation-heuristics/visited-link.tentative.html
+++ b/tests/wpt/tests/soft-navigation-heuristics/visited-link.tentative.html
@@ -12,21 +12,20 @@
 <body>
   <main id=main>
   <a id=link>Click me!</a>
-  <a id=visited>link</a>
+  <a id=visited>link that is really long so it is the LCP</a>
   </main>
   <script>
     const visited = document.getElementById("visited");
     const fake_url = "./fake_" + Math.random();
     visited.href = fake_url;
     const visitFakeURLAndAddInvisibleText = () => {
-      step_timeout(() => {
+      requestAnimationFrame(() => requestAnimationFrame(() => {
         history.replaceState({}, "", fake_url);
-      }, 10);
+      }));
       const main = document.getElementById("main");
       const div = document.createElement("div");
       const text = document.createTextNode("Lorem Ipsum");
       div.appendChild(text);
-      div.style="visibility: hidden";
       main.appendChild(div);
     }
     const link = document.getElementById("link");
@@ -35,7 +34,13 @@
         await visitFakeURLAndAddInvisibleText();
       },
       link: link,
-      validate: "no-lcp",
+      validate: async () => {
+        await new Promise(r => step_timeout(r, 100));
+        const postVisitedLcp = await getLcpEntries();
+        assert_not_equals(postVisitedLcp[postVisitedLcp.length - 1].id,
+                          "visited",
+                          "Soft Nav LCP ID should not be visited");
+      },
       test: "Test that a visited link doesn't trigger LCP after a soft " +
             "navigation is detected"});
   </script>
diff --git a/tests/wpt/tests/storage-access-api/requestStorageAccess.sub.https.window.js b/tests/wpt/tests/storage-access-api/requestStorageAccess.sub.https.window.js
index e1a8b934503..21c451ca614 100644
--- a/tests/wpt/tests/storage-access-api/requestStorageAccess.sub.https.window.js
+++ b/tests/wpt/tests/storage-access-api/requestStorageAccess.sub.https.window.js
@@ -67,17 +67,6 @@ promise_test(
         'should allow cookie access');
 
 if (testPrefix.includes('cross-site')) {
-  promise_test(
-      async t => {
-        await CommonSetup();
-        await RunCallbackWithGesture(() => {
-          return promise_rejects_dom(t, "NotAllowedError", document.requestStorageAccess(),
-            "document.requestStorageAccess() call without permission");
-        });
-      },
-      '[' + testPrefix +
-          '] document.requestStorageAccess() should be rejected with a NotAllowedError without permission grant');
-
   promise_test(
       async t => {
         await test_driver.set_permission(
@@ -85,7 +74,7 @@ if (testPrefix.includes('cross-site')) {
 
         await RunCallbackWithGesture(() => {
           return promise_rejects_dom(t, "NotAllowedError", document.requestStorageAccess(),
-            "document.requestStorageAccess() call without permission");
+            "document.requestStorageAccess() call with denied permission");
         });
       },
       '[' + testPrefix +
diff --git a/tests/wpt/tests/storage/buckets/META.yml b/tests/wpt/tests/storage/buckets/META.yml
index 4f215060f5a..4b63200cddb 100644
--- a/tests/wpt/tests/storage/buckets/META.yml
+++ b/tests/wpt/tests/storage/buckets/META.yml
@@ -1,5 +1,5 @@
-spec: https://github.com/WICG/storage-buckets
+spec: https://wicg.github.io/storage-buckets/
 suggested_reviewers:
-  - ayui
-  - jsbell
-  - pwnall
+  - ayuishii
+  - evanstade
+  - inexorabletash
diff --git a/tests/wpt/tests/svg/linking/reftests/support/green-random-rects.svg b/tests/wpt/tests/svg/linking/reftests/support/green-random-rects.svg
new file mode 100644
index 00000000000..61f9dee370d
--- /dev/null
+++ b/tests/wpt/tests/svg/linking/reftests/support/green-random-rects.svg
@@ -0,0 +1,4 @@
+<svg xmlns='http://www.w3.org/2000/svg'>
+  <rect y='900' width='20' height='100' fill='green'/>
+  <rect y='400' width='80' height='100' fill='green'/>
+</svg>
diff --git a/tests/wpt/tests/svg/linking/reftests/svgview-viewbox-override-multiple.html b/tests/wpt/tests/svg/linking/reftests/svgview-viewbox-override-multiple.html
new file mode 100644
index 00000000000..a071084a058
--- /dev/null
+++ b/tests/wpt/tests/svg/linking/reftests/svgview-viewbox-override-multiple.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>background-image with multiple layers using different views of the same image</title>
+<link rel="help" href="https://svgwg.org/svg2-draft/linking.html#LinksIntoSVG">
+<link rel="match" href="../../struct/reftests/reference/green-100x100.html">
+<style>
+  .one {
+    width: 20px;
+    height: 100px;
+    background-repeat: no-repeat;
+    background-image: url("support/green-random-rects.svg#svgView(viewBox(0,900,20,100))");
+  }
+  .two {
+    width: 80px;
+    height: 100px;
+    background-repeat: no-repeat;
+    background-image: url("support/green-random-rects.svg#svgView(viewBox(0,400,80,100))");
+    position: absolute;
+    left: 20px;
+    top: 0;
+  }
+</style>
+<div style="position: relative">
+  <div class="one"></div>
+  <div class="two"></div>
+</div>
diff --git a/tests/wpt/tests/tools/ci/ci_wptrunner_infrastructure.sh b/tests/wpt/tests/tools/ci/ci_wptrunner_infrastructure.sh
index ef61601bdcc..ebe7870afa8 100755
--- a/tests/wpt/tests/tools/ci/ci_wptrunner_infrastructure.sh
+++ b/tests/wpt/tests/tools/ci/ci_wptrunner_infrastructure.sh
@@ -5,21 +5,15 @@ SCRIPT_DIR=$(cd $(dirname "$0") && pwd -P)
 WPT_ROOT=$SCRIPT_DIR/../..
 cd $WPT_ROOT
 
-test_infrastructure() {
-    TERM=dumb ./wpt run --log-mach - --yes --manifest ~/meta/MANIFEST.json --metadata infrastructure/metadata/ --install-fonts --install-webdriver $1 $PRODUCT infrastructure/
+run_infra_test() {
+    TERM=dumb ./wpt run --log-mach - --yes --manifest ~/meta/MANIFEST.json --metadata infrastructure/metadata/ --install-fonts --install-webdriver --log-wptreport="/home/test/artifacts/wptreport-$1.json" $2 $1 infrastructure/
 }
 
 main() {
-    PRODUCTS=( "firefox" "chrome" )
     ./wpt manifest --rebuild -p ~/meta/MANIFEST.json
-    for PRODUCT in "${PRODUCTS[@]}"; do
-        if [[ "$PRODUCT" == "chrome" ]]; then
-            # Taskcluster machines do not have GPUs, so use software rendering via --enable-swiftshader.
-            test_infrastructure "--binary=$(which google-chrome-unstable) --enable-swiftshader --channel dev" "$1"
-        else
-            test_infrastructure "--binary=~/build/firefox/firefox" "$1"
-        fi
-    done
+    run_infra_test "chrome" "--binary=$(which google-chrome-unstable) --enable-swiftshader --channel dev $1"
+    run_infra_test "firefox" "--binary=~/build/firefox/firefox $1"
+    run_infra_test "firefox_android" "--install-browser --logcat-dir=/home/test/artifacts/ $1"
 }
 
 main $1
diff --git a/tests/wpt/tests/tools/ci/requirements_tc.txt b/tests/wpt/tests/tools/ci/requirements_tc.txt
index 2ee8c065dba..63250b63d3a 100644
--- a/tests/wpt/tests/tools/ci/requirements_tc.txt
+++ b/tests/wpt/tests/tools/ci/requirements_tc.txt
@@ -1,4 +1,4 @@
 pygithub==2.1.1
 pyyaml==6.0.1
 requests==2.31.0
-taskcluster==55.3.2
+taskcluster==56.0.2
diff --git a/tests/wpt/tests/tools/ci/tc/decision.py b/tests/wpt/tests/tools/ci/tc/decision.py
index 6e3bd8619d7..d00ba6ba194 100644
--- a/tests/wpt/tests/tools/ci/tc/decision.py
+++ b/tests/wpt/tests/tools/ci/tc/decision.py
@@ -249,6 +249,7 @@ def create_tc_task(event, task, taskgroup_id, depends_on_ids, env_extra=None):
         "provisionerId": task["provisionerId"],
         "schedulerId": task["schedulerId"],
         "workerType": task["workerType"],
+        "scopes": task.get("scopes", []),
         "metadata": {
             "name": task["name"],
             "description": task.get("description", ""),
@@ -269,6 +270,10 @@ def create_tc_task(event, task, taskgroup_id, depends_on_ids, env_extra=None):
     }
     if "extra" in task:
         task_data["extra"].update(task["extra"])
+    if task.get("privileged"):
+        if "capabilities" not in task_data["payload"]:
+            task_data["payload"]["capabilities"] = {}
+        task_data["payload"]["capabilities"]["privileged"] = True
     if env_extra:
         task_data["payload"]["env"].update(env_extra)
     if depends_on_ids:
diff --git a/tests/wpt/tests/tools/ci/tc/tasks/test.yml b/tests/wpt/tests/tools/ci/tc/tasks/test.yml
index d774272eca5..598a3395def 100644
--- a/tests/wpt/tests/tools/ci/tc/tasks/test.yml
+++ b/tests/wpt/tests/tools/ci/tc/tasks/test.yml
@@ -4,7 +4,7 @@ components:
     workerType: ci
     schedulerId: taskcluster-github
     deadline: "24 hours"
-    image: webplatformtests/wpt:0.54
+    image: webplatformtests/wpt:0.55
     maxRunTime: 7200
     artifacts:
       public/results:
@@ -108,6 +108,11 @@ components:
 
   browser-servo: {}
 
+  browser-firefox_android:
+    privileged: true
+    scopes:
+      - "docker-worker:capability:privileged"
+
   tox-python3_7:
     env:
       TOXENV: py37
@@ -221,6 +226,12 @@ tasks:
               use:
                 - trigger-weekly
                 - trigger-push
+            - vars:
+                browser: firefox_android
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
           do:
             - ${vars.browser}-${vars.channel}-${vars.suite}:
                 use:
@@ -285,6 +296,12 @@ tasks:
               use:
                 - trigger-daily
                 - trigger-push
+            - vars:
+                browser: firefox_android
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
           do:
             - ${vars.browser}-${vars.channel}-${vars.suite}:
                 use:
@@ -532,6 +549,7 @@ tasks:
         - wpt-base
         - trigger-pr
         - browser-firefox
+        - browser-firefox_android
       command: ./tools/ci/ci_wptrunner_infrastructure.sh
       install:
         - python3-pip
@@ -543,6 +561,7 @@ tasks:
         browser:
           - firefox
           - chrome
+          - firefox_android
         channel: experimental
         xvfb: true
         hosts: false
diff --git a/tests/wpt/tests/tools/ci/tc/tests/test_valid.py b/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
index 8c4715ad6ec..1d50115f91d 100644
--- a/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
+++ b/tests/wpt/tests/tools/ci/tc/tests/test_valid.py
@@ -267,6 +267,22 @@ def test_verify_payload():
       'wpt-webkitgtk_minibrowser-nightly-testharness-14',
       'wpt-webkitgtk_minibrowser-nightly-testharness-15',
       'wpt-webkitgtk_minibrowser-nightly-testharness-16',
+      'wpt-firefox_android-nightly-testharness-1',
+      'wpt-firefox_android-nightly-testharness-2',
+      'wpt-firefox_android-nightly-testharness-3',
+      'wpt-firefox_android-nightly-testharness-4',
+      'wpt-firefox_android-nightly-testharness-5',
+      'wpt-firefox_android-nightly-testharness-6',
+      'wpt-firefox_android-nightly-testharness-7',
+      'wpt-firefox_android-nightly-testharness-8',
+      'wpt-firefox_android-nightly-testharness-9',
+      'wpt-firefox_android-nightly-testharness-10',
+      'wpt-firefox_android-nightly-testharness-11',
+      'wpt-firefox_android-nightly-testharness-12',
+      'wpt-firefox_android-nightly-testharness-13',
+      'wpt-firefox_android-nightly-testharness-14',
+      'wpt-firefox_android-nightly-testharness-15',
+      'wpt-firefox_android-nightly-testharness-16',
       'wpt-firefox-stable-reftest-1',
       'wpt-firefox-stable-reftest-2',
       'wpt-firefox-stable-reftest-3',
@@ -287,6 +303,11 @@ def test_verify_payload():
       'wpt-webkitgtk_minibrowser-nightly-reftest-3',
       'wpt-webkitgtk_minibrowser-nightly-reftest-4',
       'wpt-webkitgtk_minibrowser-nightly-reftest-5',
+      'wpt-firefox_android-nightly-reftest-1',
+      'wpt-firefox_android-nightly-reftest-2',
+      'wpt-firefox_android-nightly-reftest-3',
+      'wpt-firefox_android-nightly-reftest-4',
+      'wpt-firefox_android-nightly-reftest-5',
       'wpt-firefox-stable-wdspec-1',
       'wpt-firefox-stable-wdspec-2',
       'wpt-chromium-nightly-wdspec-1',
@@ -295,13 +316,17 @@ def test_verify_payload():
       'wpt-chrome-stable-wdspec-2',
       'wpt-webkitgtk_minibrowser-nightly-wdspec-1',
       'wpt-webkitgtk_minibrowser-nightly-wdspec-2',
+      'wpt-firefox_android-nightly-wdspec-1',
+      'wpt-firefox_android-nightly-wdspec-2',
       'wpt-firefox-stable-crashtest-1',
       'wpt-chromium-nightly-crashtest-1',
       'wpt-chrome-stable-crashtest-1',
       'wpt-webkitgtk_minibrowser-nightly-crashtest-1',
+      'wpt-firefox_android-nightly-crashtest-1',
       'wpt-firefox-stable-print-reftest-1',
       'wpt-chromium-nightly-print-reftest-1',
-      'wpt-chrome-stable-print-reftest-1'])
+      'wpt-chrome-stable-print-reftest-1',
+      'wpt-firefox_android-nightly-print-reftest-1'])
 ])
 def test_schedule_tasks(event_path, is_pr, files_changed, expected):
     with mock.patch("tools.ci.tc.decision.get_fetch_rev", return_value=(None, None, None)):
@@ -310,4 +335,5 @@ def test_schedule_tasks(event_path, is_pr, files_changed, expected):
             with open(data_path(event_path), encoding="utf8") as event_file:
                 event = json.load(event_file)
                 scheduled = decision.decide(event)
+                print(list(scheduled.keys()))
                 assert list(scheduled.keys()) == expected
diff --git a/tests/wpt/tests/tools/docker/Dockerfile b/tests/wpt/tests/tools/docker/Dockerfile
index 5fd75c5fc3e..d54d8e94bd2 100644
--- a/tests/wpt/tests/tools/docker/Dockerfile
+++ b/tests/wpt/tests/tools/docker/Dockerfile
@@ -26,7 +26,7 @@ RUN apt-get -qqy update \
     libunwind8 \
     libxcb-shape0-dev \
     locales \
-    openjdk-8-jre-headless \
+    openjdk-17-jre-headless \
     pulseaudio \
     python3 \
     python3-dev \
@@ -80,6 +80,7 @@ RUN useradd test \
          --shell /bin/bash  \
          --create-home \
   && usermod -a -G sudo test \
+  && usermod -a -G kvm test \
   && usermod -a -G libvirt test \
   && usermod -a -G libvirt-qemu test \
   && echo 'ALL ALL = (ALL) NOPASSWD: ALL' >> /etc/sudoers \
diff --git a/tests/wpt/tests/tools/docker/frontend.py b/tests/wpt/tests/tools/docker/frontend.py
index 6ee2d20633f..f91e79fa78e 100644
--- a/tests/wpt/tests/tools/docker/frontend.py
+++ b/tests/wpt/tests/tools/docker/frontend.py
@@ -129,6 +129,7 @@ def run(*args, **kwargs):
                  os.path.join(wpt_root, "tools", "docker", "seccomp.json")])
     if kwargs["privileged"]:
         args.append("--privileged")
+        args.extend(["--device", "/dev/kvm"])
     if kwargs["checkout"]:
         args.extend(["--env", "REF==%s" % kwargs["checkout"]])
     else:
diff --git a/tests/wpt/tests/tools/lint/lint.py b/tests/wpt/tests/tools/lint/lint.py
index c50282ed3a9..8c856a931dd 100644
--- a/tests/wpt/tests/tools/lint/lint.py
+++ b/tests/wpt/tests/tools/lint/lint.py
@@ -439,11 +439,9 @@ def check_parsed(repo_root: Text, path: Text, f: IO[bytes]) -> List[rules.Error]
                 errors.append(rules.VariantMissing.error(path))
             else:
                 variant = element.attrib["content"]
-                if (variant == "" or
-                    variant[0] not in ("?", "#") or
-                    len(variant) == 1 or
-                    (variant[0] == "?" and variant[1] == "#")):
-                    errors.append(rules.MalformedVariant.error(path, (path,)))
+                if is_variant_malformed(variant):
+                    value = f"{path} `<meta name=variant>` 'content' attribute"
+                    errors.append(rules.MalformedVariant.error(path, (value,)))
 
     required_elements: List[Text] = []
 
@@ -542,6 +540,12 @@ def check_parsed(repo_root: Text, path: Text, f: IO[bytes]) -> List[rules.Error]
 
     return errors
 
+
+def is_variant_malformed(variant: str) -> bool:
+    return (variant == "" or variant[0] not in ("?", "#") or
+            len(variant) == 1 or (variant[0] == "?" and variant[1] == "#"))
+
+
 class ASTCheck(metaclass=abc.ABCMeta):
     @abc.abstractproperty
     def rule(self) -> Type[rules.Rule]:
@@ -620,7 +624,11 @@ def check_script_metadata(repo_root: Text, path: Text, f: IO[bytes]) -> List[rul
                 if value != b"long":
                     errors.append(rules.UnknownTimeoutMetadata.error(path,
                                                                      line_no=idx + 1))
-            elif key not in (b"title", b"script", b"variant", b"quic"):
+            elif key == b"variant":
+                if is_variant_malformed(value.decode()):
+                    value = f"{path} `META: variant=...` value"
+                    errors.append(rules.MalformedVariant.error(path, (value,), idx + 1))
+            elif key not in (b"title", b"script", b"quic"):
                 errors.append(rules.UnknownMetadata.error(path,
                                                           line_no=idx + 1))
         else:
@@ -680,7 +688,7 @@ def check_all_paths(repo_root: Text, paths: List[Text]) -> List[rules.Error]:
     """
 
     errors = []
-    for paths_fn in all_paths_lints:
+    for paths_fn in all_paths_lints():
         errors.extend(paths_fn(repo_root, paths))
     return errors
 
@@ -975,17 +983,21 @@ def lint(repo_root: Text,
 
 path_lints = [check_file_type, check_path_length, check_worker_collision, check_ahem_copy,
               check_mojom_js, check_tentative_directories, check_gitignore_file]
-all_paths_lints = [check_unique_testharness_basenames,
-                   check_unique_case_insensitive_paths]
 file_lints = [check_regexp_line, check_parsed, check_python_ast, check_script_metadata,
               check_ahem_system_font]
 
-# Don't break users of the lint that don't have git installed.
-try:
-    subprocess.check_output(["git", "--version"])
-    all_paths_lints += [check_git_ignore]
-except (subprocess.CalledProcessError, FileNotFoundError):
-    print('No git present; skipping .gitignore lint.')
+
+def all_paths_lints() -> Any:
+    paths = [check_unique_testharness_basenames,
+             check_unique_case_insensitive_paths]
+    # Don't break users of the lint that don't have git installed.
+    try:
+        subprocess.check_output(["git", "--version"])
+        paths += [check_git_ignore]
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        print('No git present; skipping .gitignore lint.')
+    return paths
+
 
 if __name__ == "__main__":
     args = create_parser().parse_args()
diff --git a/tests/wpt/tests/tools/lint/rules.py b/tests/wpt/tests/tools/lint/rules.py
index 06c4f579e67..8fa58f2e358 100644
--- a/tests/wpt/tests/tools/lint/rules.py
+++ b/tests/wpt/tests/tools/lint/rules.py
@@ -198,7 +198,7 @@ class VariantMissing(Rule):
 class MalformedVariant(Rule):
     name = "MALFORMED-VARIANT"
     description = collapse("""
-        %s `<meta name=variant>` 'content' attribute must be a non empty string
+        %s must be a non empty string
         and start with '?' or '#'
     """)
 
diff --git a/tests/wpt/tests/tools/lint/tests/test_file_lints.py b/tests/wpt/tests/tools/lint/tests/test_file_lints.py
index 96eaf9b84cd..d3317b3a177 100644
--- a/tests/wpt/tests/tools/lint/tests/test_file_lints.py
+++ b/tests/wpt/tests/tools/lint/tests/test_file_lints.py
@@ -813,7 +813,7 @@ def test_css_missing_file_tentative():
     (b"""// META: timeout=long\n""", None),
     (b"""//  META: timeout=long\n""", None),
     (b"""// META: script=foo.js\n""", None),
-    (b"""// META: variant=\n""", None),
+    (b"""// META: variant=\n""", (1, "MALFORMED-VARIANT")),
     (b"""// META: variant=?wss\n""", None),
     (b"""# META:\n""", None),
     (b"""\n// META: timeout=long\n""", (2, "STRAY-METADATA")),
@@ -838,6 +838,9 @@ def test_script_metadata(filename, input, error):
             "BROKEN-METADATA": "Metadata comment is not formatted correctly",
             "UNKNOWN-TIMEOUT-METADATA": "Unexpected value for timeout metadata",
             "UNKNOWN-METADATA": "Unexpected kind of metadata",
+            "MALFORMED-VARIANT": (
+                f"{filename} `META: variant=...` value must be a non empty "
+                "string and start with '?' or '#'"),
         }
         assert errors == [
             (kind,
diff --git a/tests/wpt/tests/tools/manifest/vcs.py b/tests/wpt/tests/tools/manifest/vcs.py
index 554e68ab65f..7b6b73d8779 100644
--- a/tests/wpt/tests/tools/manifest/vcs.py
+++ b/tests/wpt/tests/tools/manifest/vcs.py
@@ -56,7 +56,12 @@ class GitHasher:
         assert self.git is not None
         # note that git runs the command with tests_root as the cwd, which may
         # not be the root of the git repo (e.g., within a browser repo)
-        cmd = ["diff-index", "--relative", "--no-renames", "--name-only", "-z", "HEAD"]
+        #
+        # `git diff-index --relative` without a path still compares all tracked
+        # files before non-WPT files are filtered out, which can be slow in
+        # vendor repos. Explicitly pass the CWD (i.e., `tests_root`) as a path
+        # argument to avoid unnecessary diffing.
+        cmd = ["diff-index", "--relative", "--no-renames", "--name-only", "-z", "HEAD", os.curdir]
         data = self.git(*cmd)
         return set(data.split("\0"))
 
diff --git a/tests/wpt/tests/tools/requirements_tests.txt b/tests/wpt/tests/tools/requirements_tests.txt
index 0a4007dd8f3..1df3b7ee9e8 100644
--- a/tests/wpt/tests/tools/requirements_tests.txt
+++ b/tests/wpt/tests/tools/requirements_tests.txt
@@ -2,5 +2,5 @@ httpx[http2]==0.24.1
 json-e==4.5.3
 jsonschema==4.17.3
 pyyaml==6.0.1
-taskcluster==55.3.2
+taskcluster==56.0.2
 mozterm==1.0.0
diff --git a/tests/wpt/tests/tools/serve/serve.py b/tests/wpt/tests/tools/serve/serve.py
index 6ef5bd89180..5ba20e04580 100644
--- a/tests/wpt/tests/tools/serve/serve.py
+++ b/tests/wpt/tests/tools/serve/serve.py
@@ -622,18 +622,18 @@ class ServerProc:
     def start(self, init_func, host, port, paths, routes, bind_address, config, log_handlers, **kwargs):
         self.proc = self.mp_context.Process(target=self.create_daemon,
                                             args=(init_func, host, port, paths, routes, bind_address,
-                                                  config, log_handlers),
+                                                  config, log_handlers, dict(**os.environ)),
                                             name='%s on port %s' % (self.scheme, port),
                                             kwargs=kwargs)
         self.proc.daemon = True
         self.proc.start()
 
     def create_daemon(self, init_func, host, port, paths, routes, bind_address,
-                      config, log_handlers, **kwargs):
+                      config, log_handlers, env, **kwargs):
         # Ensure that when we start this in a new process we have the global lock
         # in the logging module unlocked
         importlib.reload(logging)
-
+        os.environ = env
         logger = get_logger(config.logging["level"], log_handlers)
 
         if sys.platform == "darwin":
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/error.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/error.py
index d3e318d1705..7b688dd1a6c 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/error.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/error.py
@@ -67,6 +67,10 @@ class NoSuchNodeException(BidiException):
     error_code = "no such node"
 
 
+class NoSuchRequestException(BidiException):
+    error_code = "no such request"
+
+
 class NoSuchScriptException(BidiException):
     error_code = "no such script"
 
diff --git a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browsing_context.py b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browsing_context.py
index 35ad93e191a..7d3ccf26157 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browsing_context.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/browsing_context.py
@@ -15,16 +15,16 @@ class ElementOptions(Dict[str, Any]):
             self["scrollIntoView"] = scroll_into_view
 
 
-class ViewportOptions(Dict[str, Any]):
+class BoxOptions(Dict[str, Any]):
     def __init__(self, x: float, y: float, width: float, height: float):
-        self["type"] = "viewport"
+        self["type"] = "box"
         self["x"] = x
         self["y"] = y
         self["width"] = width
         self["height"] = height
 
 
-ClipOptions = Union[ElementOptions, ViewportOptions]
+ClipOptions = Union[ElementOptions, BoxOptions]
 
 
 class BrowsingContext(BidiModule):
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 940aa7cffdd..b82c8539e86 100644
--- a/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
+++ b/tests/wpt/tests/tools/webdriver/webdriver/bidi/modules/network.py
@@ -57,6 +57,11 @@ class Network(BidiModule):
         assert result["intercept"] is not None
         return result["intercept"]
 
+    @command
+    def fail_request(self, request: str) -> Mapping[str, Any]:
+        params: MutableMapping[str, Any] = {"request": request}
+        return params
+
     @command
     def remove_intercept(self, intercept: str) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {"intercept": intercept}
diff --git a/tests/wpt/tests/tools/wpt/android.py b/tests/wpt/tests/tools/wpt/android.py
index 366502cc6c2..c99acf37738 100644
--- a/tests/wpt/tests/tools/wpt/android.py
+++ b/tests/wpt/tests/tools/wpt/android.py
@@ -15,141 +15,266 @@ here = os.path.abspath(os.path.dirname(__file__))
 wpt_root = os.path.abspath(os.path.join(here, os.pardir, os.pardir))
 
 
-def do_delayed_imports():
+NDK_VERSION = "r23c"
+CMDLINE_TOOLS_VERSION_STRING = "11.0"
+CMDLINE_TOOLS_VERSION = "9644228"
+
+AVD_MANIFEST_X86_64 = {
+    "emulator_package": "system-images;android-24;default;x86_64",
+    "emulator_avd_name": "mozemulator-x86_64",
+    "emulator_extra_args": [
+        "-skip-adb-auth",
+        "-verbose",
+        "-show-kernel",
+        "-ranchu",
+        "-selinux", "permissive",
+        "-memory", "3072",
+        "-cores", "4",
+        "-skin", "800x1280",
+        "-gpu", "on",
+        "-no-snapstorage",
+        "-no-snapshot",
+        "-no-window",
+        "-no-accel",
+        "-prop", "ro.test_harness=true"
+    ],
+    "emulator_extra_config": {
+        "hw.keyboard": "yes",
+        "hw.lcd.density": "320",
+        "disk.dataPartition.size": "4000MB",
+        "sdcard.size": "600M"
+    }
+}
+
+
+def do_delayed_imports(paths):
     global android_device
     from mozrunner.devices import android_device
+
     android_device.TOOLTOOL_PATH = os.path.join(os.path.dirname(__file__),
                                                 os.pardir,
                                                 "third_party",
                                                 "tooltool",
                                                 "tooltool.py")
+    android_device.EMULATOR_HOME_DIR = paths["emulator_home"]
 
 
 def get_parser_install():
     parser = argparse.ArgumentParser()
+    parser.add_argument("--path", dest="dest", action="store", default=None,
+                        help="Root path to use for emulator tooling")
     parser.add_argument("--reinstall", action="store_true", default=False,
                         help="Force reinstall even if the emulator already exists")
+    parser.add_argument("--prompt", action="store_true",
+                        help="Enable confirmation prompts")
+    parser.add_argument("--no-prompt", dest="prompt", action="store_false",
+                        help="Skip confirmation prompts")
     return parser
 
 
 def get_parser_start():
-    return get_parser_install()
+    parser = get_parser_install()
+    parser.add_argument("--device-serial", action="store", default=None,
+                        help="Device serial number for Android emulator, if not emulator-5554")
+    return parser
 
 
-def get_sdk_path(dest):
+def get_paths(dest):
+    os_name = platform.system().lower()
+
     if dest is None:
         # os.getcwd() doesn't include the venv path
-        dest = os.path.join(wpt_root, venv_dir())
-    dest = os.path.join(dest, 'android-sdk')
-    return os.path.abspath(os.environ.get('ANDROID_SDK_PATH', dest))
+        base_path = os.path.join(wpt_root, venv_dir(), "android")
+    else:
+        base_path = dest
+
+    sdk_path = os.environ.get("ANDROID_SDK_HOME", os.path.join(base_path, f"android-sdk-{os_name}"))
+    avd_path = os.environ.get("ANDROID_AVD_HOME", os.path.join(sdk_path, ".android", "avd"))
+    return {
+        "base": base_path,
+        "sdk": sdk_path,
+        "sdk_tools": os.path.join(sdk_path, "cmdline-tools", CMDLINE_TOOLS_VERSION_STRING),
+        "avd": avd_path,
+        "emulator_home": os.path.dirname(avd_path)
+    }
 
 
-def uninstall_sdk(dest=None):
-    path = get_sdk_path(dest)
-    if os.path.exists(path) and os.path.isdir(path):
-        shutil.rmtree(path)
+def get_sdk_manager_path(paths):
+    os_name = platform.system().lower()
+    file_name = "sdkmanager"
+    if os_name.startswith("win"):
+        file_name += ".bat"
+    return os.path.join(paths["sdk_tools"], "bin", file_name)
 
 
-def install_sdk(logger, dest=None):
-    sdk_path = get_sdk_path(dest)
-    if os.path.isdir(sdk_path):
-        logger.info("Using SDK installed at %s" % sdk_path)
-        return sdk_path, False
+def get_avd_manager(paths):
+    os_name = platform.system().lower()
+    file_name = "avdmanager"
+    if os_name.startswith("win"):
+        file_name += ".bat"
+    return os.path.join(paths["sdk_tools"], "bin", file_name)
 
-    if not os.path.exists(sdk_path):
-        os.makedirs(sdk_path)
 
+def uninstall_sdk(paths):
+    if os.path.exists(paths["sdk"]) and os.path.isdir(paths["sdk"]):
+        shutil.rmtree(paths["sdk"])
+
+
+def get_os_tag(logger):
     os_name = platform.system().lower()
     if os_name not in ["darwin", "linux", "windows"]:
         logger.critical("Unsupported platform %s" % os_name)
         raise NotImplementedError
 
-    os_name = 'darwin' if os_name == 'macosx' else os_name
-    # TODO: either always use the latest version or have some way to
-    # configure a per-product version if there are strong requirements
-    # to use a specific version.
-    url = f'https://dl.google.com/android/repository/sdk-tools-{os_name}-4333796.zip'
+    if os_name == "macosx":
+        return "darwin"
+    if os_name == "windows":
+        return "win"
+    return "linux"
 
-    logger.info("Getting SDK from %s" % url)
-    temp_path = os.path.join(sdk_path, url.rsplit("/", 1)[1])
+
+def download_and_extract(url, path):
+    if not os.path.exists(path):
+        os.makedirs(path)
+    temp_path = os.path.join(path, url.rsplit("/", 1)[1])
     try:
         with open(temp_path, "wb") as f:
             with requests.get(url, stream=True) as resp:
                 shutil.copyfileobj(resp.raw, f)
 
         # Python's zipfile module doesn't seem to work here
-        subprocess.check_call(["unzip", temp_path], cwd=sdk_path)
+        subprocess.check_call(["unzip", temp_path], cwd=path)
     finally:
-        os.unlink(temp_path)
-
-    return sdk_path, True
+        if os.path.exists(temp_path):
+            os.unlink(temp_path)
 
 
-def install_android_packages(logger, sdk_path, no_prompt=False):
-    sdk_manager_path = os.path.join(sdk_path, "tools", "bin", "sdkmanager")
-    if not os.path.exists(sdk_manager_path):
-        raise OSError("Can't find sdkmanager at %s" % sdk_manager_path)
+def install_sdk(logger, paths):
+    if os.path.isdir(paths["sdk_tools"]):
+        logger.info("Using SDK installed at %s" % paths["sdk_tools"])
+        return False
 
-    packages = ["platform-tools",
-                "build-tools;33.0.1",
-                "platforms;android-33",
-                "emulator"]
+    if not os.path.exists(paths["sdk"]):
+        os.makedirs(paths["sdk"])
+
+    download_path = os.path.dirname(paths["sdk_tools"])
+
+    url = f'https://dl.google.com/android/repository/commandlinetools-{get_os_tag(logger)}-{CMDLINE_TOOLS_VERSION}_latest.zip'
+    logger.info("Getting SDK from %s" % url)
+
+    download_and_extract(url, download_path)
+    os.rename(os.path.join(download_path, "cmdline-tools"), paths["sdk_tools"])
+
+    return True
+
+
+def install_android_packages(logger, paths, packages, prompt=True):
+    sdk_manager = get_sdk_manager_path(paths)
+    if not os.path.exists(sdk_manager):
+        raise OSError(f"Can't find sdkmanager at {sdk_manager}")
 
     # TODO: make this work non-internactively
-    logger.info("Installing SDK packages")
-    cmd = [sdk_manager_path] + packages
+    logger.info(f"Installing Android packages {' '.join(packages)}")
+    cmd = [sdk_manager] + packages
 
-    proc = subprocess.Popen(cmd, stdin=subprocess.PIPE)
-    if no_prompt:
-        data = "Y\n" * 100 if no_prompt else None
-        proc.communicate(data)
-    else:
-        proc.wait()
-    if proc.returncode != 0:
-        raise subprocess.CalledProcessError(proc.returncode, cmd)
+    input_data = None if prompt else "\n".join(["y"] * 100).encode("UTF-8")
+    subprocess.run(cmd, check=True, input=input_data)
 
 
-def get_emulator(sdk_path, device_serial=None):
+def install_avd(logger, paths, prompt=True):
+    avd_manager = get_avd_manager(paths)
+    avd_manifest = AVD_MANIFEST_X86_64
+
+    install_android_packages(logger, paths, [avd_manifest["emulator_package"]], prompt=prompt)
+
+    cmd = [avd_manager,
+           "--verbose",
+           "create",
+           "avd",
+           "--force",
+           "--name",
+           avd_manifest["emulator_avd_name"],
+           "--package",
+           avd_manifest["emulator_package"]]
+    input_data = None if prompt else b"no"
+    subprocess.run(cmd, check=True, input=input_data)
+
+
+def get_emulator(paths, device_serial=None):
     if android_device is None:
-        do_delayed_imports()
-    if "ANDROID_SDK_ROOT" not in os.environ:
-        os.environ["ANDROID_SDK_ROOT"] = sdk_path
+        do_delayed_imports(paths)
+
     substs = {"top_srcdir": wpt_root, "TARGET_CPU": "x86"}
-    emulator = android_device.AndroidEmulator("*", substs=substs, device_serial=device_serial)
-    emulator.emulator_path = os.path.join(sdk_path, "emulator", "emulator")
+    emulator = android_device.AndroidEmulator(substs=substs,
+                                              device_serial=device_serial,
+                                              verbose=True)
+    emulator.emulator_path = os.path.join(paths["sdk"], "emulator", "emulator")
     return emulator
 
 
-def install(logger, reinstall=False, no_prompt=False, device_serial=None):
-    if reinstall:
-        uninstall_sdk()
+class Environ:
+    def __init__(self, **kwargs):
+        self.environ = None
+        self.set_environ = kwargs
 
-    dest, new_install = install_sdk(logger)
-    if new_install:
-        install_android_packages(logger, dest, no_prompt)
+    def __enter__(self):
+        self.environ = os.environ.copy()
+        for key, value in self.set_environ.items():
+            if value is None:
+                if key in os.environ:
+                    del os.environ[key]
+            else:
+                os.environ[key] = value
 
-    if "ANDROID_SDK_ROOT" not in os.environ:
-        os.environ["ANDROID_SDK_ROOT"] = dest
+    def __exit__(self, *args, **kwargs):
+        os.environ = self.environ
 
-    emulator = get_emulator(dest, device_serial=device_serial)
+
+def android_environment(paths):
+    return Environ(ANDROID_EMULATOR_HOME=paths["emulator_home"],
+                   ANDROID_AVD_HOME=paths["avd"],
+                   ANDROID_SDK_ROOT=paths["sdk"],
+                   ANDROID_SDK_HOME=paths["sdk"])
+
+
+def install(logger, dest=None, reinstall=False, prompt=True):
+    paths = get_paths(dest)
+
+    with android_environment(paths):
+
+        if reinstall:
+            uninstall_sdk(paths)
+
+        new_install = install_sdk(logger, paths)
+
+        if new_install:
+            packages = ["platform-tools",
+                        "build-tools;33.0.1",
+                        "platforms;android-33",
+                        "emulator"]
+
+            install_android_packages(logger, paths, packages, prompt=prompt)
+
+            install_avd(logger, paths, prompt=prompt)
+
+        emulator = get_emulator(paths)
     return emulator
 
 
-def start(logger, emulator=None, reinstall=False, device_serial=None):
-    if reinstall:
-        install(reinstall=True)
+def start(logger, dest=None, reinstall=False, prompt=True, device_serial=None):
+    paths = get_paths(dest)
 
-    sdk_path = get_sdk_path(None)
+    with android_environment(paths):
+        install(logger, dest=dest, reinstall=reinstall, prompt=prompt)
 
-    if emulator is None:
-        emulator = get_emulator(sdk_path, device_serial=device_serial)
+        emulator = get_emulator(paths, device_serial=device_serial)
 
-    if not emulator.check_avd():
-        logger.critical("Android AVD not found, please run |mach bootstrap|")
-        raise NotImplementedError
+        if not emulator.check_avd():
+            logger.critical("Android AVD not found, please run |wpt install-android-emulator|")
+            raise OSError
 
-    emulator.start()
-    emulator.wait_for_start()
+        emulator.start()
+        emulator.wait_for_start()
     return emulator
 
 
diff --git a/tests/wpt/tests/tools/wpt/browser.py b/tests/wpt/tests/tools/wpt/browser.py
index 3c5f060c4ed..dda054f5ee8 100644
--- a/tests/wpt/tests/tools/wpt/browser.py
+++ b/tests/wpt/tests/tools/wpt/browser.py
@@ -38,7 +38,7 @@ FIREFOX_CI_ROOT_URL = 'https://firefox-ci-tc.services.mozilla.com'
 
 
 def _get_fileversion(binary, logger=None):
-    command = "(Get-Item '%s').VersionInfo.FileVersion" % binary.replace("'", "''")
+    command = "(Get-Item -ErrorAction Stop '%s').VersionInfo.FileVersion" % binary.replace("'", "''")
     try:
         return call("powershell.exe", command).strip()
     except (subprocess.CalledProcessError, OSError):
@@ -393,7 +393,7 @@ class Firefox(Browser):
         return "%s/archive/%s.zip/testing/profiles/" % (repo, tag)
 
     def install_prefs(self, binary, dest=None, channel=None):
-        if binary:
+        if binary and not binary.endswith(".apk"):
             version, channel_ = self.get_version_and_channel(binary)
             if channel is not None and channel != channel_:
                 # Beta doesn't always seem to have the b in the version string, so allow the
@@ -411,7 +411,7 @@ class Firefox(Browser):
         if version:
             dest = os.path.join(dest, version)
         have_cache = False
-        if os.path.exists(dest) and len(os.listdir(dest)) > 0:
+        if os.path.exists(dest) and os.path.exists(os.path.join(dest, "profiles.json")):
             if channel != "nightly":
                 have_cache = True
             else:
@@ -427,7 +427,7 @@ class Firefox(Browser):
 
             url = self.get_profile_bundle_url(version, channel)
 
-            self.logger.info("Installing test prefs from %s" % url)
+            self.logger.info(f"Downloading test prefs from {url}")
             try:
                 extract_dir = tempfile.mkdtemp()
                 unzip(get(url).raw, dest=extract_dir)
@@ -438,8 +438,9 @@ class Firefox(Browser):
                     shutil.move(path, dest)
             finally:
                 rmtree(extract_dir)
+            self.logger.info(f"Test prefs downloaded to {dest}")
         else:
-            self.logger.info("Using cached test prefs from %s" % dest)
+            self.logger.info(f"Using cached test prefs from {dest}")
 
         return dest
 
@@ -535,16 +536,17 @@ class FirefoxAndroid(Browser):
     def __init__(self, logger):
         super().__init__(logger)
         self.apk_path = None
+        self._fx_browser = Firefox(self.logger)
 
     def download(self, dest=None, channel=None, rename=None):
         if dest is None:
             dest = os.pwd
 
         resp = get_taskcluster_artifact(
-            "gecko.v2.mozilla-central.latest.mobile.android-x86_64-opt",
-            "public/build/geckoview-androidTest.apk")
+            "gecko.v2.mozilla-central.shippable.latest.mobile.android-x86_64-opt",
+            "public/build/geckoview-test_runner.apk")
 
-        filename = "geckoview-androidTest.apk"
+        filename = "geckoview-test_runner.apk"
         if rename:
             filename = "%s%s" % (rename, get_ext(filename)[1])
         self.apk_path = os.path.join(dest, filename)
@@ -558,17 +560,16 @@ class FirefoxAndroid(Browser):
         return self.download(dest, channel)
 
     def install_prefs(self, binary, dest=None, channel=None):
-        fx_browser = Firefox(self.logger)
-        return fx_browser.install_prefs(binary, dest, channel)
+        return self._fx_browser.install_prefs(binary, dest, channel)
 
     def find_binary(self, venv_path=None, channel=None):
         return self.apk_path
 
     def find_webdriver(self, venv_path=None, channel=None):
-        raise NotImplementedError
+        return self._fx_browser.find_webdriver(venv_path, channel)
 
     def install_webdriver(self, dest=None, channel=None, browser_binary=None):
-        raise NotImplementedError
+        return self._fx_browser.install_webdriver(dest, channel, None)
 
     def version(self, binary=None, webdriver_binary=None):
         return None
diff --git a/tests/wpt/tests/tools/wpt/install.py b/tests/wpt/tests/tools/wpt/install.py
index 13b0ae81d8d..382c1e2eb80 100644
--- a/tests/wpt/tests/tools/wpt/install.py
+++ b/tests/wpt/tests/tools/wpt/install.py
@@ -7,6 +7,7 @@ latest_channels = {
     'android_weblayer': 'dev',
     'android_webview': 'dev',
     'firefox': 'nightly',
+    'firefox_android': 'nightly',
     'chrome': 'canary',
     'chrome_android': 'dev',
     'chromium': 'nightly',
diff --git a/tests/wpt/tests/tools/wpt/run.py b/tests/wpt/tests/tools/wpt/run.py
index efc90d1debd..c5012af122f 100644
--- a/tests/wpt/tests/tools/wpt/run.py
+++ b/tests/wpt/tests/tools/wpt/run.py
@@ -3,6 +3,7 @@
 import argparse
 import os
 import platform
+import subprocess
 import sys
 from shutil import which
 from typing import ClassVar, Tuple, Type
@@ -57,6 +58,8 @@ def create_parser():
     parser.add_argument("--install-webdriver", action="store_true",
                         help="Install WebDriver from the release channel specified by --channel "
                         "(or the nightly channel by default).")
+    parser.add_argument("--logcat-dir", action="store", default=None,
+                        help="Directory to write Android logcat files to")
     parser._add_container_actions(wptcommandline.create_parser())
     return parser
 
@@ -158,6 +161,62 @@ in PowerShell with Administrator privileges.""" % (wpt_path, hosts_path)
                 raise WptrunError(message)
 
 
+class AndroidLogcat:
+    def __init__(self, adb_path, base_path=None):
+        self.adb_path = adb_path
+        self.base_path = base_path if base_path is not None else os.curdir
+        self.procs = {}
+
+    def start(self, device_serial):
+        """
+        Start recording logcat. Writes logcat to the upload directory.
+        """
+        # Start logcat for the device. The adb process runs until the
+        # corresponding device is stopped. Output is written directly to
+        # the blobber upload directory so that it is uploaded automatically
+        # at the end of the job.
+        if device_serial in self.procs:
+            logger.warning(f"Logcat for {device_serial} already started")
+            return
+
+        logcat_path = os.path.join(self.base_path, f"logcat-{device_serial}.log")
+        out_file = open(logcat_path, "w")
+        cmd = [
+            self.adb_path,
+            "-s",
+            device_serial,
+            "logcat",
+            "-v",
+            "threadtime",
+            "Trace:S",
+            "StrictMode:S",
+            "ExchangeService:S",
+        ]
+        logger.debug(" ".join(cmd))
+        proc = subprocess.Popen(
+            cmd, stdout=out_file, stdin=subprocess.PIPE
+        )
+        logger.info(f"Started logcat for device {device_serial} pid {proc.pid}")
+        self.procs[device_serial] = (proc, out_file)
+
+    def stop(self, device_serial=None):
+        """
+        Stop logcat process started by logcat_start.
+        """
+        if device_serial is None:
+            for key in list(self.procs.keys()):
+                self.stop(key)
+            return
+
+        proc, out_file = self.procs.get(device_serial, (None, None))
+        if proc is not None:
+            try:
+                proc.kill()
+                out_file.close()
+            finally:
+                del self.procs[device_serial]
+
+
 class BrowserSetup:
     name: ClassVar[str]
     browser_cls: ClassVar[Type[browser.Browser]]
@@ -189,6 +248,9 @@ class BrowserSetup:
     def setup(self, kwargs):
         self.setup_kwargs(kwargs)
 
+    def teardown(self):
+        pass
+
 
 def safe_unsetenv(env_var):
     """Safely remove an environment variable.
@@ -302,29 +364,50 @@ class FirefoxAndroid(BrowserSetup):
         if not kwargs["device_serial"]:
             kwargs["device_serial"] = ["emulator-5554"]
 
+        if kwargs["webdriver_binary"] is None and "wdspec" in kwargs["test_types"]:
+            webdriver_binary = None
+            if not kwargs["install_webdriver"]:
+                webdriver_binary = self.browser.find_webdriver()
+
+            if webdriver_binary is None:
+                install = self.prompt_install("geckodriver")
+
+                if install:
+                    logger.info("Downloading geckodriver")
+                    webdriver_binary = self.browser.install_webdriver(
+                        dest=self.venv.bin_path,
+                        channel=kwargs["browser_channel"],
+                        browser_binary=kwargs["binary"])
+            else:
+                logger.info("Using webdriver binary %s" % webdriver_binary)
+
+            if webdriver_binary:
+                kwargs["webdriver_binary"] = webdriver_binary
+            else:
+                logger.info("Unable to find or install geckodriver, skipping wdspec tests")
+                kwargs["test_types"].remove("wdspec")
+
         for device_serial in kwargs["device_serial"]:
             if device_serial.startswith("emulator-"):
                 # We're running on an emulator so ensure that's set up
-                emulator = android.install(logger,
-                                           reinstall=False,
-                                           no_prompt=not self.prompt,
-                                           device_serial=device_serial)
                 android.start(logger,
-                              emulator=emulator,
                               reinstall=False,
-                              device_serial=device_serial)
+                              device_serial=device_serial,
+                              prompt=kwargs["prompt"])
 
         if "ADB_PATH" not in os.environ:
-            adb_path = os.path.join(android.get_sdk_path(None),
+            adb_path = os.path.join(android.get_paths(None)["sdk"],
                                     "platform-tools",
                                     "adb")
             os.environ["ADB_PATH"] = adb_path
         adb_path = os.environ["ADB_PATH"]
 
+        self._logcat = AndroidLogcat(adb_path, base_path=kwargs["logcat_dir"])
+
         for device_serial in kwargs["device_serial"]:
             device = mozdevice.ADBDeviceFactory(adb=adb_path,
                                                 device=device_serial)
-
+            self._logcat.start(device_serial)
             if self.browser.apk_path:
                 device.uninstall_app(app)
                 device.install_app(self.browser.apk_path)
@@ -332,6 +415,10 @@ class FirefoxAndroid(BrowserSetup):
                 raise WptrunError("app %s not installed on device %s" %
                                   (app, device_serial))
 
+    def teardown(self):
+        if hasattr(self, "_logcat"):
+            self._logcat.stop()
+
 
 class Chrome(BrowserSetup):
     name = "chrome"
@@ -902,7 +989,8 @@ def setup_wptrunner(venv, **kwargs):
                   "install_browser",
                   "install_webdriver",
                   "channel",
-                  "prompt"]:
+                  "prompt",
+                  "logcat_dir"]:
         del wptrunner_kwargs[kwarg]
 
     wptcommandline.check_args(wptrunner_kwargs)
@@ -915,15 +1003,18 @@ def setup_wptrunner(venv, **kwargs):
             webdriver_binary=wptrunner_kwargs.get("webdriver_binary"),
         )
 
-    return wptrunner_kwargs
+    return setup_cls, wptrunner_kwargs
 
 
 def run(venv, **kwargs):
     setup_logging(kwargs)
 
-    wptrunner_kwargs = setup_wptrunner(venv, **kwargs)
+    setup_cls, wptrunner_kwargs = setup_wptrunner(venv, **kwargs)
 
-    rv = run_single(venv, **wptrunner_kwargs) > 0
+    try:
+        rv = run_single(venv, **wptrunner_kwargs) > 0
+    finally:
+        setup_cls.teardown()
 
     return rv
 
diff --git a/tests/wpt/tests/tools/wpt/tests/test_wpt.py b/tests/wpt/tests/tools/wpt/tests/test_wpt.py
index c977b9a873f..daa9d6b906e 100644
--- a/tests/wpt/tests/tools/wpt/tests/test_wpt.py
+++ b/tests/wpt/tests/tools/wpt/tests/test_wpt.py
@@ -206,6 +206,7 @@ def test_run_zero_tests():
 
 @pytest.mark.slow
 @pytest.mark.remote_network
+@pytest.mark.skip(reason="https://github.com/web-platform-tests/wpt/issues/42433")
 @pytest.mark.skipif(sys.platform == "win32",
                     reason="https://github.com/web-platform-tests/wpt/issues/28745")
 def test_run_failing_test():
@@ -239,6 +240,7 @@ def test_run_failing_test():
 
 @pytest.mark.slow
 @pytest.mark.remote_network
+@pytest.mark.skip(reason="https://github.com/web-platform-tests/wpt/issues/42433")
 @pytest.mark.skipif(sys.platform == "win32",
                     reason="https://github.com/web-platform-tests/wpt/issues/28745")
 def test_run_verify_unstable(temp_test):
diff --git a/tests/wpt/tests/tools/wpt/update.py b/tests/wpt/tests/tools/wpt/update.py
index 41faeac54f0..4dba7e69df8 100644
--- a/tests/wpt/tests/tools/wpt/update.py
+++ b/tests/wpt/tests/tools/wpt/update.py
@@ -13,8 +13,8 @@ def manifest_update(test_paths):
     from manifest import manifest  # type: ignore
     for url_base, paths in test_paths.items():
         manifest.load_and_update(
-            paths["tests_path"],
-            paths["manifest_path"],
+            paths.tests_path,
+            paths.manifest_path,
             url_base)
 
 
diff --git a/tests/wpt/tests/tools/wptrunner/requirements.txt b/tests/wpt/tests/tools/wptrunner/requirements.txt
index ffb46dea79a..1c4316a9f86 100644
--- a/tests/wpt/tests/tools/wptrunner/requirements.txt
+++ b/tests/wpt/tests/tools/wptrunner/requirements.txt
@@ -7,4 +7,4 @@ packaging==23.1
 pillow==9.5.0
 requests==2.31.0
 six==1.16.0
-urllib3==2.0.5
+urllib3==2.0.6
diff --git a/tests/wpt/tests/tools/wptrunner/requirements_edge.txt b/tests/wpt/tests/tools/wptrunner/requirements_edge.txt
index f5c4e20a2ce..30b14b692fd 100644
--- a/tests/wpt/tests/tools/wptrunner/requirements_edge.txt
+++ b/tests/wpt/tests/tools/wptrunner/requirements_edge.txt
@@ -1 +1 @@
-selenium==4.12.0
+selenium==4.14.0
diff --git a/tests/wpt/tests/tools/wptrunner/requirements_ie.txt b/tests/wpt/tests/tools/wptrunner/requirements_ie.txt
index 1630585dae5..4ff0fedd321 100644
--- a/tests/wpt/tests/tools/wptrunner/requirements_ie.txt
+++ b/tests/wpt/tests/tools/wptrunner/requirements_ie.txt
@@ -1,2 +1,2 @@
 mozprocess==1.3.1
-selenium==4.12.0
+selenium==4.14.0
diff --git a/tests/wpt/tests/tools/wptrunner/requirements_opera.txt b/tests/wpt/tests/tools/wptrunner/requirements_opera.txt
index 1630585dae5..4ff0fedd321 100644
--- a/tests/wpt/tests/tools/wptrunner/requirements_opera.txt
+++ b/tests/wpt/tests/tools/wptrunner/requirements_opera.txt
@@ -1,2 +1,2 @@
 mozprocess==1.3.1
-selenium==4.12.0
+selenium==4.14.0
diff --git a/tests/wpt/tests/tools/wptrunner/requirements_sauce.txt b/tests/wpt/tests/tools/wptrunner/requirements_sauce.txt
index 2be155d9f57..5538fb0672d 100644
--- a/tests/wpt/tests/tools/wptrunner/requirements_sauce.txt
+++ b/tests/wpt/tests/tools/wptrunner/requirements_sauce.txt
@@ -1,2 +1,2 @@
-selenium==4.12.0
+selenium==4.14.0
 requests==2.31.0
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/base.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/base.py
index bebdf29b642..180e3fb9592 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/base.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/base.py
@@ -5,6 +5,7 @@ import errno
 import os
 import platform
 import socket
+import time
 import traceback
 from abc import ABCMeta, abstractmethod
 
@@ -302,8 +303,7 @@ class WebDriverBrowser(Browser):
         self.env = os.environ.copy() if env is None else env
         self.webdriver_args = webdriver_args if webdriver_args is not None else []
 
-        self.url = f"http://{self.host}:{self.port}{self.base_path}"
-
+        self.init_deadline = None
         self._output_handler = None
         self._cmd = None
         self._proc = None
@@ -314,10 +314,12 @@ class WebDriverBrowser(Browser):
         return [self.webdriver_binary] + self.webdriver_args
 
     def start(self, group_metadata, **kwargs):
+        self.init_deadline = time.time() + self.init_timeout
         try:
             self._run_server(group_metadata, **kwargs)
         except KeyboardInterrupt:
             self.stop()
+            raise
 
     def create_output_handler(self, cmd):
         """Return an instance of the class used to handle application output.
@@ -351,7 +353,7 @@ class WebDriverBrowser(Browser):
                 self.logger,
                 self.host,
                 self.port,
-                timeout=self.init_timeout,
+                timeout=self.init_deadline - time.time(),
                 server_process=self._proc,
             )
         except Exception:
@@ -384,6 +386,12 @@ class WebDriverBrowser(Browser):
     def is_alive(self):
         return hasattr(self._proc, "proc") and self._proc.poll() is None
 
+    @property
+    def url(self):
+        if self.port is not None:
+            return f"http://{self.host}:{self.port}{self.base_path}"
+        raise ValueError("Can't get WebDriver URL before port is assigned")
+
     @property
     def pid(self):
         if self._proc is not None:
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
index 5e954912544..889a841b309 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/chrome.py
@@ -107,6 +107,9 @@ def executor_kwargs(logger, test_type, test_environment, run_info_data,
     chrome_options["args"].append("--enable-features=SecurePaymentConfirmationBrowser")
     # For WebTransport tests.
     chrome_options["args"].append("--webtransport-developer-mode")
+    # The GenericSensorExtraClasses flag enables the browser-side
+    # implementation of sensors such as Ambient Light Sensor.
+    chrome_options["args"].append("--enable-features=GenericSensorExtraClasses")
 
     # Classify `http-private`, `http-public` and https variants in the
     # appropriate IP address spaces.
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
index 2ef3e18900f..72f6c858a1c 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -3,6 +3,7 @@
 import json
 import os
 import platform
+import re
 import signal
 import subprocess
 import sys
@@ -604,6 +605,32 @@ class FirefoxOutputHandler(OutputHandler):
                                            command=" ".join(self.command))
 
 
+class GeckodriverOutputHandler(FirefoxOutputHandler):
+    PORT_RE = re.compile(rb".*Listening on [^ :]*:(\d+)")
+
+    def __init__(self, logger, command, symbols_path=None, stackfix_dir=None, asan=False,
+                 leak_report_file=None, init_deadline=None):
+        super().__init__(logger, command, symbols_path=symbols_path, stackfix_dir=stackfix_dir, asan=asan,
+                         leak_report_file=leak_report_file)
+        self.port = None
+        self.init_deadline = None
+
+    def after_process_start(self, pid):
+        super().after_process_start(pid)
+        while self.port is None:
+            time.sleep(0.1)
+            if self.init_deadline is not None and time.time() > self.init_deadline:
+                raise TimeoutError("Failed to get geckodriver port within the timeout")
+
+    def __call__(self, line):
+        if self.port is None:
+            m = self.PORT_RE.match(line)
+            if m is not None:
+                self.port = int(m.groups()[0])
+                self.logger.debug(f"Got geckodriver port {self.port}")
+        super().__call__(line)
+
+
 class ProfileCreator:
     def __init__(self, logger, prefs_root, config, test_type, extra_prefs, e10s,
                  disable_fission, debug_test, browser_channel, binary, certutil_binary,
@@ -653,20 +680,13 @@ class ProfileCreator:
                     elif name != 'unittest-features':
                         pref_paths.append(os.path.join(self.prefs_root, name, 'user.js'))
         else:
-            # Old preference files used before the creation of profiles.json (remove when no longer supported)
-            legacy_pref_paths = (
-                os.path.join(self.prefs_root, 'prefs_general.js'),   # Used in Firefox 60 and below
-                os.path.join(self.prefs_root, 'common', 'user.js'),  # Used in Firefox 61
-            )
-            for path in legacy_pref_paths:
-                if os.path.isfile(path):
-                    pref_paths.append(path)
+            self.logger.warning(f"Failed to load profiles from {profiles}")
 
         for path in pref_paths:
             if os.path.exists(path):
                 prefs.add(Preferences.read_prefs(path))
             else:
-                self.logger.warning("Failed to find base prefs file in %s" % path)
+                self.logger.warning(f"Failed to find prefs file in {path}")
 
         # Add any custom preferences
         prefs.add(self.extra_prefs, cast=True)
@@ -911,12 +931,13 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
         return env
 
     def create_output_handler(self, cmd):
-        return FirefoxOutputHandler(self.logger,
-                                    cmd,
-                                    stackfix_dir=self.stackfix_dir,
-                                    symbols_path=self.symbols_path,
-                                    asan=self.asan,
-                                    leak_report_file=self.leak_report_file)
+        return GeckodriverOutputHandler(self.logger,
+                                        cmd,
+                                        stackfix_dir=self.stackfix_dir,
+                                        symbols_path=self.symbols_path,
+                                        asan=self.asan,
+                                        leak_report_file=self.leak_report_file,
+                                        init_deadline=self.init_deadline)
 
     def start(self, group_metadata, **kwargs):
         self.leak_report_file = setup_leak_report(self.leak_check, self.profile, self.env)
@@ -960,7 +981,12 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
                 time.sleep(1)
             else:
                 self.logger.debug("WebDriver session didn't end")
-        super().stop(force=force)
+        try:
+            super().stop(force=force)
+        finally:
+            if self._output_handler is not None:
+                self._output_handler.port = None
+            self._port = None
 
     def cleanup(self):
         super().cleanup()
@@ -974,10 +1000,19 @@ class FirefoxWdSpecBrowser(WebDriverBrowser):
                 "mozleak_allowed": self.leak_check and test.mozleak_allowed,
                 "mozleak_thresholds": self.leak_check and test.mozleak_threshold}
 
+    @property
+    def port(self):
+        # We read the port from geckodriver on startup
+        if self._port is None:
+            if self._output_handler is None or self._output_handler.port is None:
+                raise ValueError("Can't get geckodriver port before it's started")
+            self._port = self._output_handler.port
+        return self._port
+
     def make_command(self):
         return [self.webdriver_binary,
                 "--host", self.host,
-                "--port", str(self.port)] + self.webdriver_args
+                "--port", "0"] + self.webdriver_args
 
     def executor_browser(self):
         cls, args = super().executor_browser()
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/config.py b/tests/wpt/tests/tools/wptrunner/wptrunner/config.py
index c114ee3e6a9..d78efbfd2df 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/config.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/config.py
@@ -4,23 +4,25 @@ from configparser import ConfigParser
 import os
 import sys
 from collections import OrderedDict
-from typing import Any, Dict
+from typing import Dict, Mapping, Optional
 
 here = os.path.dirname(__file__)
 
-class ConfigDict(Dict[str, Any]):
-    def __init__(self, base_path, *args, **kwargs):
+
+class ConfigDict(Dict[str, str]):
+    def __init__(self, base_path: str, *args: str, **kwargs: str):
         self.base_path = base_path
         dict.__init__(self, *args, **kwargs)
 
-    def get_path(self, key, default=None):
+    def get_path(self, key: str, default:Optional[str] = None) -> Optional[str]:
         if key not in self:
             return default
         path = self[key]
         os.path.expanduser(path)
         return os.path.abspath(os.path.join(self.base_path, path))
 
-def read(config_path):
+
+def read(config_path: str) -> Mapping[str, ConfigDict]:
     config_path = os.path.abspath(config_path)
     config_root = os.path.dirname(config_path)
     parser = ConfigParser()
@@ -37,6 +39,7 @@ def read(config_path):
 
     return rv
 
+
 def path(argv=None):
     if argv is None:
         argv = []
@@ -59,5 +62,6 @@ def path(argv=None):
 
     return os.path.abspath(path)
 
+
 def load():
     return read(path(sys.argv))
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/environment.py b/tests/wpt/tests/tools/wptrunner/wptrunner/environment.py
index de96f799ba3..e206e427546 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/environment.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/environment.py
@@ -45,7 +45,7 @@ def do_delayed_imports(logger, test_paths):
 
 
 def serve_path(test_paths):
-    return test_paths["/"]["tests_path"]
+    return test_paths["/"].tests_path
 
 
 def webtranport_h3_server_is_running(host, port, timeout):
@@ -249,10 +249,10 @@ class TestEnvironment:
 
         route_builder.add_handler("GET", "/resources/testdriver.js", TestdriverLoader())
 
-        for url_base, paths in self.test_paths.items():
+        for url_base, test_root in self.test_paths.items():
             if url_base == "/":
                 continue
-            route_builder.add_mount_point(url_base, paths["tests_path"])
+            route_builder.add_mount_point(url_base, test_root.tests_path)
 
         if "/" not in self.test_paths:
             del route_builder.mountpoint_routes["/"]
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
index e622c6c67d9..d9875535b25 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/actions.py
@@ -367,6 +367,61 @@ class ResetFedCMCooldownAction:
         self.logger.debug("Resetting FedCM cooldown")
         return self.protocol.fedcm.reset_fedcm_cooldown()
 
+
+class CreateVirtualSensorAction:
+    name = "create_virtual_sensor"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        sensor_type = payload["sensor_type"]
+        sensor_params = payload["sensor_params"]
+        self.logger.debug("Creating %s sensor with %s values" % (sensor_type, sensor_params))
+        return self.protocol.virtual_sensor.create_virtual_sensor(sensor_type, sensor_params)
+
+
+class UpdateVirtualSensorAction:
+    name = "update_virtual_sensor"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        sensor_type = payload["sensor_type"]
+        reading = payload["reading"]
+        self.logger.debug("Updating %s sensor with new readings: %s" % (sensor_type, reading))
+        return self.protocol.virtual_sensor.update_virtual_sensor(sensor_type, reading)
+
+
+class RemoveVirtualSensorAction:
+    name = "remove_virtual_sensor"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        sensor_type = payload["sensor_type"]
+        self.logger.debug("Removing %s sensor" % sensor_type)
+        return self.protocol.virtual_sensor.remove_virtual_sensor(sensor_type)
+
+
+class GetVirtualSensorInformationAction:
+    name = "get_virtual_sensor_information"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        sensor_type = payload["sensor_type"]
+        self.logger.debug("Requesting information from %s sensor" % sensor_type)
+        return self.protocol.virtual_sensor.get_virtual_sensor_information(sensor_type)
+
+
 actions = [ClickAction,
            DeleteAllCookiesAction,
            GetAllCookiesAction,
@@ -394,4 +449,8 @@ actions = [ClickAction,
            GetFedCMDialogTitleAction,
            GetFedCMDialogTypeAction,
            SetFedCMDelayEnabledAction,
-           ResetFedCMCooldownAction]
+           ResetFedCMCooldownAction,
+           CreateVirtualSensorAction,
+           UpdateVirtualSensorAction,
+           RemoveVirtualSensorAction,
+           GetVirtualSensorInformationAction]
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
index a4d658eaeb2..1e66e60890e 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/base.py
@@ -751,7 +751,13 @@ class CallbackHandler:
             raise ValueError(f"Unknown action {action}") from e
         try:
             with ActionContext(self.logger, self.protocol, payload.get("context")):
-                result = action_handler(payload)
+                try:
+                    result = action_handler(payload)
+                except AttributeError as e:
+                    # If we fail to get an attribute from the protocol presumably that's a
+                    # ProtocolPart we don't implement
+                    if getattr(e, "obj") == self.protocol:
+                        raise NotImplementedError from e
         except self.unimplemented_exc:
             self.logger.warning("Action %s not implemented" % action)
             self._send_message(cmd_id, "complete", "error", f"Action {action} not implemented")
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
index eaeaddf4123..05567a0b99d 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -44,6 +44,7 @@ from .protocol import (AccessibilityProtocolPart,
                        SetPermissionProtocolPart,
                        PrintProtocolPart,
                        DebugProtocolPart,
+                       VirtualSensorProtocolPart,
                        merge_dicts)
 
 
@@ -720,6 +721,23 @@ class MarionetteAccessibilityProtocolPart(AccessibilityProtocolPart):
         return element.computed_role
 
 
+class MarionetteVirtualSensorProtocolPart(VirtualSensorProtocolPart):
+    def setup(self):
+        self.marionette = self.parent.marionette
+
+    def create_virtual_sensor(self, sensor_type, sensor_params):
+        raise NotImplementedError("create_virtual_sensor not yet implemented")
+
+    def update_virtual_sensor(self, sensor_type, reading):
+        raise NotImplementedError("update_virtual_sensor not yet implemented")
+
+    def remove_virtual_sensor(self, remove_parameters):
+        raise NotImplementedError("remove_virtual_sensor not yet implemented")
+
+    def get_virtual_sensor_information(self, information_parameters):
+        raise NotImplementedError("get_virtual_sensor_information not yet implemented")
+
+
 class MarionetteProtocol(Protocol):
     implements = [MarionetteBaseProtocolPart,
                   MarionetteTestharnessProtocolPart,
@@ -739,7 +757,8 @@ class MarionetteProtocol(Protocol):
                   MarionetteSetPermissionProtocolPart,
                   MarionettePrintProtocolPart,
                   MarionetteDebugProtocolPart,
-                  MarionetteAccessibilityProtocolPart]
+                  MarionetteAccessibilityProtocolPart,
+                  MarionetteVirtualSensorProtocolPart]
 
     def __init__(self, executor, browser, capabilities=None, timeout_multiplier=1, e10s=True, ccov=False):
         do_delayed_imports()
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index ff174a4e0ca..e3760b8d5f8 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -33,6 +33,7 @@ from .protocol import (BaseProtocolPart,
                        DebugProtocolPart,
                        SPCTransactionsProtocolPart,
                        FedCMProtocolPart,
+                       VirtualSensorProtocolPart,
                        merge_dicts)
 
 from webdriver.client import Session
@@ -396,6 +397,26 @@ class WebDriverDebugProtocolPart(DebugProtocolPart):
         raise NotImplementedError()
 
 
+class WebDriverVirtualSensorPart(VirtualSensorProtocolPart):
+    def setup(self):
+        self.webdriver = self.parent.webdriver
+
+    def create_virtual_sensor(self, sensor_type, sensor_params):
+        body = {"type": sensor_type}
+        body.update(sensor_params)
+        return self.webdriver.send_session_command("POST", "sensor", body)
+
+    def update_virtual_sensor(self, sensor_type, reading):
+        body = {"reading": reading}
+        return self.webdriver.send_session_command("POST", "sensor/%s" % sensor_type, body)
+
+    def remove_virtual_sensor(self, sensor_type):
+        return self.webdriver.send_session_command("DELETE", "sensor/%s" % sensor_type)
+
+    def get_virtual_sensor_information(self, sensor_type):
+        return self.webdriver.send_session_command("GET", "sensor/%s" % sensor_type)
+
+
 class WebDriverProtocol(Protocol):
     implements = [WebDriverBaseProtocolPart,
                   WebDriverTestharnessProtocolPart,
@@ -412,7 +433,8 @@ class WebDriverProtocol(Protocol):
                   WebDriverVirtualAuthenticatorProtocolPart,
                   WebDriverSPCTransactionsProtocolPart,
                   WebDriverFedCMProtocolPart,
-                  WebDriverDebugProtocolPart]
+                  WebDriverDebugProtocolPart,
+                  WebDriverVirtualSensorPart]
 
     def __init__(self, executor, browser, capabilities, **kwargs):
         super().__init__(executor, browser)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
index abf3191cd2f..cac25e4e672 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/executors/protocol.py
@@ -760,3 +760,26 @@ class WdspecProtocol(ConnectionlessProtocol):
         conn.request("HEAD", "/invalid")
         res = conn.getresponse()
         return res.status == 404
+
+
+class VirtualSensorProtocolPart(ProtocolPart):
+    """Protocol part for Sensors"""
+    __metaclass__ = ABCMeta
+
+    name = "virtual_sensor"
+
+    @abstractmethod
+    def create_virtual_sensor(self, sensor_type, sensor_params):
+        pass
+
+    @abstractmethod
+    def update_virtual_sensor(self, sensor_type, reading):
+        pass
+
+    @abstractmethod
+    def remove_virtual_sensor(self, sensor_type):
+        pass
+
+    @abstractmethod
+    def get_virtual_sensor_information(self, sensor_type):
+        pass
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/manifestexpected.py b/tests/wpt/tests/tools/wptrunner/wptrunner/manifestexpected.py
index 51ce343baa7..6c2f5c96c29 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/manifestexpected.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/manifestexpected.py
@@ -131,11 +131,11 @@ def fuzzy_prop(node):
     key = <test name> [reftype <reference name>]
     reftype = "==" | "!="
     prop = [propName "=" ] range
-    propName = "maxDifferences" | "totalPixels"
+    propName = "maxDifference" | "totalPixels"
     range = <digits> ["-" <digits>]
 
     So for example:
-      maxDifferences=10;totalPixels=10-20
+      maxDifference=10;totalPixels=10-20
 
       specifies that for any test/ref pair for which no other rule is supplied,
       there must be a maximum pixel difference of exactly 10, and between 10 and
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js b/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
index 8e44800d6cb..29c661512da 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/testdriver-extra.js
@@ -268,11 +268,11 @@
     window.test_driver_internal.set_spc_transaction_mode = function(mode, context = null) {
         return create_action("set_spc_transaction_mode", {mode, context});
     };
-    
+
     window.test_driver_internal.cancel_fedcm_dialog = function(context = null) {
         return create_action("cancel_fedcm_dialog", {context});
     };
-    
+
     window.test_driver_internal.confirm_idp_login = function(context = null) {
         return create_action("confirm_idp_login", {context});
     };
@@ -280,19 +280,19 @@
     window.test_driver_internal.select_fedcm_account = function(account_index, context = null) {
         return create_action("select_fedcm_account", {account_index, context});
     };
-    
+
     window.test_driver_internal.get_fedcm_account_list = function(context = null) {
         return create_action("get_fedcm_account_list", {context});
     };
-    
+
     window.test_driver_internal.get_fedcm_dialog_title = function(context = null) {
         return create_action("get_fedcm_dialog_title", {context});
     };
-    
+
     window.test_driver_internal.get_fedcm_dialog_type = function(context = null) {
         return create_action("get_fedcm_dialog_type", {context});
     };
-    
+
     window.test_driver_internal.set_fedcm_delay_enabled = function(enabled, context = null) {
         return create_action("set_fedcm_delay_enabled", {enabled, context});
     };
@@ -300,4 +300,20 @@
     window.test_driver_internal.reset_fedcm_cooldown = function(context = null) {
         return create_action("reset_fedcm_cooldown", {context});
     };
+
+    window.test_driver_internal.create_virtual_sensor = function(sensor_type, sensor_params={}, context=null) {
+        return create_action("create_virtual_sensor", {sensor_type, sensor_params, context});
+    };
+
+    window.test_driver_internal.update_virtual_sensor = function(sensor_type, reading, context=null) {
+        return create_action("update_virtual_sensor", {sensor_type, reading, context});
+    };
+
+    window.test_driver_internal.remove_virtual_sensor = function(sensor_type, context=null) {
+        return create_action("remove_virtual_sensor", {sensor_type, context});
+    };
+
+    window.test_driver_internal.get_virtual_sensor_information = function(sensor_type, context=null) {
+        return create_action("get_virtual_sensor_information", {sensor_type, context});
+    };
 })();
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/testloader.py b/tests/wpt/tests/tools/wptrunner/wptrunner/testloader.py
index 6cb2110301f..aa266548d7e 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/testloader.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/testloader.py
@@ -1,4 +1,4 @@
-# mypy: allow-untyped-defs
+# mypy: allow-untyped-calls, allow-untyped-defs
 from __future__ import annotations
 
 import abc
@@ -9,9 +9,9 @@ import os
 import queue
 from urllib.parse import urlsplit
 from abc import ABCMeta, abstractmethod
-from queue import Empty
 from collections import defaultdict, deque, namedtuple
-from typing import cast, Any, Dict, List, Optional, Set
+from typing import (cast, Any, Callable, Dict, Deque, List, Mapping, MutableMapping, Optional, Set,
+                    Tuple, Type)
 
 from . import manifestinclude
 from . import manifestexpected
@@ -23,6 +23,9 @@ manifest = None
 manifest_update = None
 download_from_github = None
 
+# Mapping from (subsuite, test_type) to [Test]
+TestsByType = Mapping[Tuple[str, str], List[wpttest.Test]]
+
 
 def do_delayed_imports():
     # This relies on an already loaded module having set the sys.path correctly :(
@@ -32,6 +35,35 @@ def do_delayed_imports():
     from manifest.download import download_from_github  # type: ignore
 
 
+class WriteQueue:
+    def __init__(self, queue_cls: Callable[[], Any] = queue.SimpleQueue):
+        """Queue wrapper that is only used for writing items to a queue.
+
+        Once all items are enqueued, call to_read() to get a reader for the queue.
+        This will also prevent further writes using this writer."""
+        self._raw_queue = queue_cls()
+
+    def put(self, item: Any) -> None:
+        if self._raw_queue is None:
+            raise ValueError("Tried to write to closed queue")
+        self._raw_queue.put(item)
+
+    def to_read(self) -> ReadQueue:
+        reader = ReadQueue(self._raw_queue)
+        self._raw_queue = None
+        return reader
+
+
+class ReadQueue:
+    def __init__(self, raw_queue: Any):
+        self._raw_queue = raw_queue
+
+    def get(self) -> Any:
+        """Queue wrapper that is only used for reading items from a queue."""
+        return self._raw_queue.get(False)
+
+
+
 class TestGroups:
     def __init__(self, logger, path, subsuites):
         try:
@@ -294,19 +326,20 @@ class ManifestLoader:
 
     def load(self):
         rv = {}
-        for url_base, paths in self.test_paths.items():
-            manifest_file = self.load_manifest(url_base=url_base,
-                                               **paths)
-            path_data = {"url_base": url_base}
-            path_data.update(paths)
+        for url_base, test_root in self.test_paths.items():
+            manifest_file = self.load_manifest(url_base, test_root)
+            path_data = {"url_base": url_base,
+                         "tests_path": test_root.tests_path,
+                         "metadata_path": test_root.metadata_path,
+                         "manifest_path": test_root.manifest_path}
             rv[manifest_file] = path_data
         return rv
 
-    def load_manifest(self, tests_path, manifest_path, metadata_path, url_base="/", **kwargs):
-        cache_root = os.path.join(metadata_path, ".cache")
+    def load_manifest(self, url_base, test_root):
+        cache_root = os.path.join(test_root.metadata_path, ".cache")
         if self.manifest_download:
-            download_from_github(manifest_path, tests_path)
-        return manifest.load_and_update(tests_path, manifest_path, url_base,
+            download_from_github(test_root.manifest_path, test_root.tests_path)
+        return manifest.load_and_update(test_root.tests_path, test_root.manifest_path, url_base,
                                         cache_root=cache_root, update=self.force_manifest_update,
                                         types=self.types)
 
@@ -475,46 +508,48 @@ class TestLoader:
         return groups
 
 
-TestSourceData = namedtuple("TestSourceData", ["cls", "kwargs"])
 
-
-def get_test_src(**kwargs):
-    test_source_kwargs = {"processes": kwargs["processes"],
-                          "logger": kwargs["logger"]}
+def get_test_queue_builder(**kwargs: Any) -> Tuple[TestQueueBuilder, Mapping[str, Any]]:
+    builder_kwargs = {"processes": kwargs["processes"],
+                      "logger": kwargs["logger"]}
     chunker_kwargs = {}
+    builder_cls: Type[TestQueueBuilder]
     if kwargs["fully_parallel"]:
-        test_source_cls = FullyParallelGroupedSource
+        builder_cls = FullyParallelGroupedSource
     elif kwargs["run_by_dir"] is not False:
         # A value of None indicates infinite depth
-        test_source_cls = PathGroupedSource
-        test_source_kwargs["depth"] = kwargs["run_by_dir"]
+        builder_cls = PathGroupedSource
+        builder_kwargs["depth"] = kwargs["run_by_dir"]
         chunker_kwargs["depth"] = kwargs["run_by_dir"]
     elif kwargs["test_groups"]:
-        test_source_cls = GroupFileTestSource
-        test_source_kwargs["test_groups"] = kwargs["test_groups"]
+        builder_cls = GroupFileTestSource
+        builder_kwargs["test_groups"] = kwargs["test_groups"]
     else:
-        test_source_cls = SingleTestSource
-    return TestSourceData(test_source_cls, test_source_kwargs), chunker_kwargs
+        builder_cls = SingleTestSource
+    return builder_cls(**builder_kwargs), chunker_kwargs
 
 
 TestGroup = namedtuple("TestGroup", ["group", "subsuite", "test_type", "metadata"])
 
 
-class TestSource:
+class TestQueueBuilder:
     __metaclass__ = ABCMeta
 
-    def __init__(self, test_queue):
-        self.test_queue = test_queue
-        self.current_group = TestGroup(None, None, None, None)
-        self.logger = structured.get_default_logger()
-        if self.logger is None:
-            self.logger = structured.structuredlog.StructuredLogger("TestSource")
+    def __init__(self, **kwargs: Any):
+        """Class for building a queue of groups of tests to run.
 
-    @classmethod
-    def make_queue(cls, tests_by_type, **kwargs):
-        test_queue = queue.SimpleQueue()
-        groups = cls.make_groups(tests_by_type, **kwargs)
-        processes = cls.process_count(kwargs["processes"], len(groups))
+        Each item in the queue is a TestGroup, which consists of an iterable of
+        tests to run, the name of the subsuite, the name of the test type, and
+        a dictionary containing group-specific metadata.
+
+        Tests in the same group are run in the same TestRunner in the
+        provided order."""
+        self.kwargs = kwargs
+
+    def make_queue(self, tests_by_type: TestsByType) -> Tuple[ReadQueue, int]:
+        test_queue = WriteQueue()
+        groups = self.make_groups(tests_by_type)
+        processes = self.process_count(self.kwargs["processes"], len(groups))
         if processes > 1:
             groups.sort(key=lambda group: (
                 # Place groups of the same test type together to minimize
@@ -526,54 +561,35 @@ class TestSource:
             ))
         for item in groups:
             test_queue.put(item)
-        cls.add_sentinal(test_queue, processes)
-        return test_queue, processes
 
-    @classmethod
+        return test_queue.to_read(), processes
+
     @abstractmethod
-    def make_groups(cls, tests_by_type, **kwargs):  # noqa: N805
+    def make_groups(self, tests_by_type: TestsByType) -> List[TestGroup]:
+        """Divide a given set of tests into groups that will be run together."""
         pass
 
-    @classmethod
     @abstractmethod
-    def tests_by_group(cls, tests_by_type, **kwargs):  # noqa: N805
+    def tests_by_group(self, tests_by_type: TestsByType) -> Mapping[str, List[str]]:
         pass
 
-    @classmethod
-    def group_metadata(cls, state):
+    def group_metadata(self, state: Mapping[str, Any]) -> Mapping[str, Any]:
         return {"scope": "/"}
 
-    def group(self):
-        if not self.current_group.group or len(self.current_group.group) == 0:
-            try:
-                self.current_group = self.test_queue.get(block=True, timeout=5)
-            except Empty:
-                self.logger.warning("Timed out getting test group from queue")
-                return TestGroup(None, None, None, None)
-        return self.current_group
-
-    @classmethod
-    def add_sentinal(cls, test_queue, num_of_workers):
-        # add one sentinal for each worker
-        for _ in range(num_of_workers):
-            test_queue.put(TestGroup(None, None, None, None))
-
-    @classmethod
-    def process_count(cls, requested_processes, num_test_groups):
+    def process_count(self, requested_processes: int, num_test_groups: int) -> int:
         """Get the number of processes to use.
 
         This must always be at least one, but otherwise not more than the number of test groups"""
         return max(1, min(requested_processes, num_test_groups))
 
 
-class SingleTestSource(TestSource):
-    @classmethod
-    def make_groups(cls, tests_by_type, **kwargs):
+class SingleTestSource(TestQueueBuilder):
+    def make_groups(self, tests_by_type: TestsByType) -> List[TestGroup]:
         groups = []
         for (subsuite, test_type), tests in tests_by_type.items():
-            processes = kwargs["processes"]
-            queues = [deque([]) for _ in range(processes)]
-            metadatas = [cls.group_metadata(None) for _ in range(processes)]
+            processes = self.kwargs["processes"]
+            queues: List[Deque[TestGroup]] = [deque([]) for _ in range(processes)]
+            metadatas = [self.group_metadata({}) for _ in range(processes)]
             for test in tests:
                 idx = hash(test.id) % processes
                 group = queues[idx]
@@ -589,19 +605,21 @@ class SingleTestSource(TestSource):
                     groups.append(TestGroup(*item))
         return groups
 
-    @classmethod
-    def tests_by_group(cls, tests_by_type, **kwargs):
-        groups = defaultdict(list)
+    def tests_by_group(self, tests_by_type: TestsByType) -> Mapping[str, List[str]]:
+        groups: MutableMapping[str, List[str]] = defaultdict(list)
         for (subsuite, test_type), tests in tests_by_type.items():
-            group_name = f"{subsuite}:{cls.group_metadata(None)['scope']}"
+            group_name = f"{subsuite}:{self.group_metadata({})['scope']}"
             groups[group_name].extend(test.id for test in tests)
         return groups
 
 
-class PathGroupedSource(TestSource):
-    @classmethod
-    def new_group(cls, state, subsuite, test_type, test, **kwargs):
-        depth = kwargs.get("depth")
+class PathGroupedSource(TestQueueBuilder):
+    def new_group(self,
+                  state: MutableMapping[str, Any],
+                  subsuite: str,
+                  test_type: str,
+                  test: wpttest.Test) -> bool:
+        depth = self.kwargs.get("depth")
         if depth is True or depth == 0:
             depth = None
         path = urlsplit(test.url).path.split("/")[1:-1][:depth]
@@ -609,36 +627,34 @@ class PathGroupedSource(TestSource):
         state["prev_group_key"] = (subsuite, test_type, path)
         return rv
 
-    @classmethod
-    def make_groups(cls, tests_by_type, **kwargs):
-        groups, state = [], {}
+    def make_groups(self, tests_by_type: TestsByType) -> List[TestGroup]:
+        groups = []
+        state: MutableMapping[str, Any] = {}
         for (subsuite, test_type), tests in tests_by_type.items():
             for test in tests:
-                if cls.new_group(state, subsuite, test_type, test, **kwargs):
-                    group_metadata = cls.group_metadata(state)
+                if self.new_group(state, subsuite, test_type, test):
+                    group_metadata = self.group_metadata(state)
                     groups.append(TestGroup(deque(), subsuite, test_type, group_metadata))
                 group, _, _, metadata = groups[-1]
                 group.append(test)
                 test.update_metadata(metadata)
         return groups
 
-    @classmethod
-    def tests_by_group(cls, tests_by_type, **kwargs):
+    def tests_by_group(self, tests_by_type: TestsByType) -> Mapping[str, List[str]]:
         groups = defaultdict(list)
-        state = {}
+        state: MutableMapping[str, Any] = {}
         for (subsuite, test_type), tests in tests_by_type.items():
             for test in tests:
-                if cls.new_group(state, subsuite, test_type, test, **kwargs):
-                    group = cls.group_metadata(state)['scope']
-                if subsuite is not None:
+                if self.new_group(state, subsuite, test_type, test):
+                    group = self.group_metadata(state)['scope']
+                if subsuite:
                     group_name = f"{subsuite}:{group}"
                 else:
                     group_name = group
                 groups[group_name].append(test.id)
         return groups
 
-    @classmethod
-    def group_metadata(cls, state):
+    def group_metadata(self, state: Mapping[str, Any]) -> Mapping[str, Any]:
         return {"scope": "/%s" % "/".join(state["prev_group_key"][2])}
 
 
@@ -646,24 +662,25 @@ class FullyParallelGroupedSource(PathGroupedSource):
     # Chuck every test into a different group, so that they can run
     # fully parallel with each other. Useful to run a lot of tests
     # clustered in a few directories.
-    @classmethod
-    def new_group(cls, state, subsuite, test_type, test, **kwargs):
+    def new_group(self,
+                  state: MutableMapping[str, Any],
+                  subsuite: str,
+                  test_type: str,
+                  test: wpttest.Test) -> bool:
         path = urlsplit(test.url).path.split("/")[1:-1]
         state["prev_group_key"] = (subsuite, test_type, path)
         return True
 
 
-class GroupFileTestSource(TestSource):
-    @classmethod
-    def make_groups(cls, tests_by_type, **kwargs):
+class GroupFileTestSource(TestQueueBuilder):
+    def make_groups(self, tests_by_type: TestsByType) -> List[TestGroup]:
         groups = []
         for (subsuite, test_type), tests in tests_by_type.items():
-            tests_by_group = cls.tests_by_group({(subsuite, test_type): tests},
-                                                **kwargs)
+            tests_by_group = self.tests_by_group({(subsuite, test_type): tests})
             ids_to_tests = {test.id: test for test in tests}
             for group_name, test_ids in tests_by_group.items():
                 group_metadata = {"scope": group_name}
-                group = deque()
+                group: Deque[wpttest.Test] = deque()
                 for test_id in test_ids:
                     test = ids_to_tests[test_id]
                     group.append(test)
@@ -671,9 +688,8 @@ class GroupFileTestSource(TestSource):
                 groups.append(TestGroup(group, subsuite, test_type, group_metadata))
         return groups
 
-    @classmethod
-    def tests_by_group(cls, tests_by_type, **kwargs):
-        test_groups = kwargs["test_groups"]
+    def tests_by_group(self, tests_by_type: TestsByType) -> Mapping[str, List[str]]:
+        test_groups = self.kwargs["test_groups"]
 
         tests_by_group = defaultdict(list)
         for (subsuite, test_type), tests in tests_by_type.items():
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py b/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
index 05e0436899c..b84f1a52be3 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/testrunner.py
@@ -9,7 +9,7 @@ from typing import Any, Mapping, Optional
 
 from mozlog import structuredlog, capture
 
-from . import mpcontext
+from . import mpcontext, testloader
 
 # Special value used as a sentinal in various commands
 Stop = object()
@@ -253,6 +253,23 @@ class BrowserManager:
         return self.browser.is_alive()
 
 
+class TestSource:
+    def __init__(self, logger: structuredlog.StructuredLogger, test_queue: testloader.ReadQueue):
+        self.logger = logger
+        self.test_queue = test_queue
+        self.current_group = testloader.TestGroup(None, None, None, None)
+
+    def group(self) -> testloader.TestGroup:
+        if not self.current_group.group or len(self.current_group.group) == 0:
+            try:
+                self.current_group = self.test_queue.get()
+                self.logger.debug(f"Got new test group subsuite:{self.current_group[1]} "
+                                  f"test_type:{self.current_group[2]}")
+            except Empty:
+                return testloader.TestGroup(None, None, None, None)
+        return self.current_group
+
+
 class _RunnerManagerState:
     before_init = namedtuple("before_init", [])
     initializing = namedtuple("initializing",
@@ -269,7 +286,7 @@ RunnerManagerState = _RunnerManagerState()
 
 
 class TestRunnerManager(threading.Thread):
-    def __init__(self, suite_name, index, test_queue, test_source_cls,
+    def __init__(self, suite_name, index, test_queue,
                  test_implementations, stop_flag, retry_index=0, rerun=1,
                  pause_after_test=False, pause_on_unexpected=False,
                  restart_on_unexpected=True, debug_info=None,
@@ -290,9 +307,6 @@ class TestRunnerManager(threading.Thread):
           processes
         """
         self.suite_name = suite_name
-
-        self.test_source = test_source_cls(test_queue)
-
         self.manager_number = index
         self.test_implementation_key = None
 
@@ -311,11 +325,9 @@ class TestRunnerManager(threading.Thread):
             else:
                 self.test_implementations[key] = test_implementation
 
-        mp = mpcontext.get_context()
-
         # Flags used to shut down this thread if we get a sigint
         self.parent_stop_flag = stop_flag
-        self.child_stop_flag = mp.Event()
+        self.child_stop_flag = mpcontext.get_context().Event()
 
         # Keep track of the current retry index. The retries are meant to handle
         # flakiness, so at retry round we should restart the browser after each test.
@@ -326,36 +338,31 @@ class TestRunnerManager(threading.Thread):
         self.pause_on_unexpected = pause_on_unexpected
         self.restart_on_unexpected = restart_on_unexpected
         self.debug_info = debug_info
+        self.capture_stdio = capture_stdio
+        self.restart_on_new_group = restart_on_new_group
+        self.max_restarts = max_restarts
 
         assert recording is not None
         self.recording = recording
 
-        self.command_queue = mp.Queue()
-        self.remote_queue = mp.Queue()
-
-        self.test_runner_proc = None
-
-        super().__init__(name=f"TestRunnerManager-{index}")
-        # This is started in the actual new thread
-        self.logger = None
-
         self.test_count = 0
         self.unexpected_fail_tests = defaultdict(list)
         self.unexpected_pass_tests = defaultdict(list)
 
-        # This may not really be what we want
-        self.daemon = True
+        # Properties we initialize right after the thread is started
+        self.logger = None
+        self.test_source = None
+        self.command_queue = None
+        self.remote_queue = None
 
+        # Properties we initalize later in the lifecycle
         self.timer = None
-
-        self.max_restarts = max_restarts
-
+        self.test_runner_proc = None
         self.browser = None
 
-        self.capture_stdio = capture_stdio
-        self.restart_on_new_group = restart_on_new_group
+        super().__init__(name=f"TestRunnerManager-{index}", target=self.run_loop, args=[test_queue], daemon=True)
 
-    def run(self):
+    def run_loop(self, test_queue):
         """Main loop for the TestRunnerManager.
 
         TestRunnerManagers generally receive commands from their
@@ -365,6 +372,13 @@ class TestRunnerManager(threading.Thread):
         spins."""
         self.recording.set(["testrunner", "startup"])
         self.logger = structuredlog.StructuredLogger(self.suite_name)
+
+        self.test_source = TestSource(self.logger, test_queue)
+
+        mp = mpcontext.get_context()
+        self.command_queue = mp.Queue()
+        self.remote_queue = mp.Queue()
+
         dispatch = {
             RunnerManagerState.before_init: self.start_init,
             RunnerManagerState.initializing: self.init,
@@ -682,6 +696,14 @@ class TestRunnerManager(threading.Thread):
             is_unexpected = expected != result.status and result.status not in known_intermittent
             is_expected_notrun = (expected == "NOTRUN" or "NOTRUN" in known_intermittent)
 
+            if not is_unexpected and result.status in ["FAIL", "PRECONDITION_FAILED"]:
+                # subtest is expected FAIL or expected PRECONDITION_FAILED,
+                # change result to unexpected if expected_fail_message does not
+                # match
+                expected_fail_message = test.expected_fail_message(result.name)
+                if expected_fail_message is not None and result.message != expected_fail_message:
+                    is_unexpected = True
+
             if is_unexpected:
                 subtest_unexpected = True
 
@@ -919,7 +941,7 @@ class TestRunnerManager(threading.Thread):
 
 class ManagerGroup:
     """Main thread object that owns all the TestRunnerManager threads."""
-    def __init__(self, suite_name, test_source, test_implementations,
+    def __init__(self, suite_name, test_queue_builder, test_implementations,
                  retry_index=0,
                  rerun=1,
                  pause_after_test=False,
@@ -931,7 +953,7 @@ class ManagerGroup:
                  recording=None,
                  max_restarts=5):
         self.suite_name = suite_name
-        self.test_source = test_source
+        self.test_queue_builder = test_queue_builder
         self.test_implementations = test_implementations
         self.pause_after_test = pause_after_test
         self.pause_on_unexpected = pause_on_unexpected
@@ -959,15 +981,13 @@ class ManagerGroup:
 
     def run(self, tests):
         """Start all managers in the group"""
-        test_queue, size = self.test_source.cls.make_queue(
-            tests, **self.test_source.kwargs)
+        test_queue, size = self.test_queue_builder.make_queue(tests)
         self.logger.info("Using %i child processes" % size)
 
         for idx in range(size):
             manager = TestRunnerManager(self.suite_name,
                                         idx,
                                         test_queue,
-                                        self.test_source.cls,
                                         self.test_implementations,
                                         self.stop_flag,
                                         self.retry_index,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/browsers/test_webkitgtk.py b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/browsers/test_webkitgtk.py
index 324142c0add..b5fc5fce5fe 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/browsers/test_webkitgtk.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/browsers/test_webkitgtk.py
@@ -7,9 +7,11 @@ import pytest
 
 from wptserve.config import ConfigBuilder
 from ..base import active_products
-from wptrunner import environment, products, testloader
+from wptrunner import environment, products, testloader, wptcommandline
 
-test_paths = {"/": {"tests_path": join(dirname(__file__), "..", "..", "..", "..", "..")}}  # repo root
+wpt_root = join(dirname(__file__), "..", "..", "..", "..")
+
+test_paths = {"/": wptcommandline.TestRoot(wpt_root, wpt_root)}
 environment.do_delayed_imports(None, test_paths)
 
 logger = logging.getLogger()
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_products.py b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_products.py
index 43175110eb3..0781ec5de48 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_products.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_products.py
@@ -8,8 +8,11 @@ import pytest
 from .base import all_products, active_products
 from .. import environment
 from .. import products
+from .. import wptcommandline
 
-test_paths = {"/": {"tests_path": join(dirname(__file__), "..", "..", "..", "..")}}  # repo root
+wpt_root = join(dirname(__file__), "..", "..", "..", "..")
+
+test_paths = {"/": wptcommandline.TestRoot(wpt_root, wpt_root)}
 environment.do_delayed_imports(None, test_paths)
 
 
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_update.py b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_update.py
index e569db9b4af..59aaaeadff7 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_update.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/tests/test_update.py
@@ -8,7 +8,7 @@ from unittest import mock
 
 import pytest
 
-from .. import metadata, manifestupdate, wptmanifest
+from .. import metadata, manifestupdate, wptcommandline, wptmanifest
 from ..update.update import WPTUpdate
 from ..update.base import StepRunner, Step
 from mozlog import structuredlog, handlers, formatters
@@ -1771,13 +1771,14 @@ class UpdateRunner(StepRunner):
 
 def test_update_pickle():
     logger = structuredlog.StructuredLogger("expected_test")
+    wpt_root = os.path.abspath(os.path.join(here,
+                                            os.pardir,
+                                            os.pardir,
+                                            os.pardir,
+                                            os.pardir))
     args = {
         "test_paths": {
-            "/": {"tests_path": os.path.abspath(os.path.join(here,
-                                                             os.pardir,
-                                                             os.pardir,
-                                                             os.pardir,
-                                                             os.pardir))},
+            "/": wptcommandline.TestRoot(wpt_root, wpt_root),
         },
         "abort": False,
         "continue": False,
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/update/update.py b/tests/wpt/tests/tools/wptrunner/wptrunner/update/update.py
index 1e9be41504f..d519c20bea5 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/update/update.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/update/update.py
@@ -25,8 +25,8 @@ class LoadConfig(Step):
                       "path": state.kwargs["sync_path"]}
 
         state.paths = state.kwargs["test_paths"]
-        state.tests_path = state.paths["/"]["tests_path"]
-        state.metadata_path = state.paths["/"]["metadata_path"]
+        state.tests_path = state.paths["/"].tests_path
+        state.metadata_path = state.paths["/"].metadata_path
 
         assert os.path.isabs(state.tests_path)
 
@@ -108,12 +108,12 @@ class RemoveObsolete(Step):
             return
 
         paths = state.kwargs["test_paths"]
-        state.tests_path = state.paths["/"]["tests_path"]
-        state.metadata_path = state.paths["/"]["metadata_path"]
+        state.tests_path = state.paths["/"].tests_path
+        state.metadata_path = state.paths["/"].metadata_path
 
         for url_paths in paths.values():
-            tests_path = url_paths["tests_path"]
-            metadata_path = url_paths["metadata_path"]
+            tests_path = url_paths.tests_path
+            metadata_path = url_paths.metadata_path
             for dirpath, dirnames, filenames in os.walk(metadata_path):
                 for filename in filenames:
                     if filename == "__dir__.ini":
@@ -144,7 +144,7 @@ class WPTUpdate:
         :param kwargs: Command line arguments
         """
         self.runner_cls = runner_cls
-        self.serve_root = kwargs["test_paths"]["/"]["tests_path"]
+        self.serve_root = kwargs["test_paths"]["/"].tests_path
 
         if not kwargs["sync"]:
             setup_paths(self.serve_root)
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
index d90f028ceb6..87f51d6be7f 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wptcommandline.py
@@ -6,12 +6,14 @@ import sys
 from collections import OrderedDict
 from shutil import which
 from datetime import timedelta
+from typing import Mapping, Optional
 
 from . import config
 from . import products
 from . import wpttest
 from .formatters import chromium, wptreport, wptscreenshot
 
+
 def abs_path(path):
     return os.path.abspath(os.path.expanduser(path))
 
@@ -483,65 +485,82 @@ def set_from_config(kwargs):
                     new_value = kwargs["config"].get(section, config.ConfigDict({})).get_path(config_value)
                 kwargs[kw_value] = new_value
 
-    kwargs["test_paths"] = get_test_paths(kwargs["config"])
-
-    if kwargs["tests_root"]:
-        if "/" not in kwargs["test_paths"]:
-            kwargs["test_paths"]["/"] = {}
-        kwargs["test_paths"]["/"]["tests_path"] = kwargs["tests_root"]
-
-    if kwargs["metadata_root"]:
-        if "/" not in kwargs["test_paths"]:
-            kwargs["test_paths"]["/"] = {}
-        kwargs["test_paths"]["/"]["metadata_path"] = kwargs["metadata_root"]
-
-    if kwargs.get("manifest_path"):
-        if "/" not in kwargs["test_paths"]:
-            kwargs["test_paths"]["/"] = {}
-        kwargs["test_paths"]["/"]["manifest_path"] = kwargs["manifest_path"]
+    test_paths = get_test_paths(kwargs["config"],
+                                kwargs["tests_root"],
+                                kwargs["metadata_root"],
+                                kwargs["manifest_path"])
+    check_paths(test_paths)
+    kwargs["test_paths"] = test_paths
 
     kwargs["suite_name"] = kwargs["config"].get("web-platform-tests", {}).get("name", "web-platform-tests")
 
 
-    check_paths(kwargs)
+
+class TestRoot:
+    def __init__(self, tests_path: str, metadata_path: str, manifest_path: Optional[str] = None):
+        self.tests_path = tests_path
+        self.metadata_path = metadata_path
+        if manifest_path is None:
+            manifest_path = os.path.join(metadata_path, "MANIFEST.json")
+
+        self.manifest_path = manifest_path
 
 
-def get_test_paths(config):
+TestPaths = Mapping[str, TestRoot]
+
+
+def get_test_paths(config: Mapping[str, config.ConfigDict],
+                   tests_path_override: Optional[str] = None,
+                   metadata_path_override: Optional[str] = None,
+                   manifest_path_override: Optional[str] = None) -> TestPaths:
     # Set up test_paths
     test_paths = OrderedDict()
 
     for section in config.keys():
         if section.startswith("manifest:"):
-            manifest_opts = config.get(section)
+            manifest_opts = config[section]
             url_base = manifest_opts.get("url_base", "/")
-            test_paths[url_base] = {
-                "tests_path": manifest_opts.get_path("tests"),
-                "metadata_path": manifest_opts.get_path("metadata"),
-            }
-            if "manifest" in manifest_opts:
-                test_paths[url_base]["manifest_path"] = manifest_opts.get_path("manifest")
+            tests_path = manifest_opts.get_path("tests")
+            if tests_path is None:
+                raise ValueError(f"Missing `tests` key in configuration with url_base {url_base}")
+            metadata_path = manifest_opts.get_path("metadata")
+            if metadata_path is None:
+                raise ValueError(f"Missing `metadata` key in configuration with url_base {url_base}")
+            manifest_path = manifest_opts.get_path("manifest")
+
+            if url_base == "/":
+                if tests_path_override is not None:
+                    tests_path = tests_path_override
+                if metadata_path_override is not None:
+                    metadata_path = metadata_path_override
+                if manifest_path_override is not None:
+                    manifest_path = manifest_path_override
+
+            test_paths[url_base] = TestRoot(tests_path, metadata_path, manifest_path)
+
+    if "/" not in test_paths:
+        if tests_path_override is None or metadata_path_override is None:
+            raise ValueError("No ini file configures the root url, "
+                             "so --tests and --metadata arguments are mandatory")
+        test_paths["/"] = TestRoot(tests_path_override,
+                                   metadata_path_override,
+                                   manifest_path_override)
 
     return test_paths
 
 
-def exe_path(name):
+def exe_path(name: Optional[str]) -> Optional[str]:
     if name is None:
-        return
+        return None
 
     return which(name)
 
 
-def check_paths(kwargs):
-    for test_paths in kwargs["test_paths"].values():
-        if not ("tests_path" in test_paths and
-                "metadata_path" in test_paths):
-            print("Fatal: must specify both a test path and metadata path")
-            sys.exit(1)
-        if "manifest_path" not in test_paths:
-            test_paths["manifest_path"] = os.path.join(test_paths["metadata_path"],
-                                                       "MANIFEST.json")
-        for key, path in test_paths.items():
+def check_paths(test_paths: TestPaths) -> None:
+    for test_root in test_paths.values():
+        for key in ["tests_path", "metadata_path", "manifest_path"]:
             name = key.split("_", 1)[0]
+            path = getattr(test_root, key)
 
             if name == "manifest":
                 # For the manifest we can create it later, so just check the path
@@ -694,7 +713,7 @@ def check_args_metadata_update(kwargs):
             sys.exit(1)
 
     if kwargs["properties_file"] is None and not kwargs["no_properties_file"]:
-        default_file = os.path.join(kwargs["test_paths"]["/"]["metadata_path"],
+        default_file = os.path.join(kwargs["test_paths"]["/"].metadata_path,
                                     "update_properties.json")
         if os.path.exists(default_file):
             kwargs["properties_file"] = default_file
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wptrunner.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wptrunner.py
index 8badb131639..a4ad268dce1 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wptrunner.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wptrunner.py
@@ -1,4 +1,4 @@
-# mypy: allow-untyped-defs
+# mypy: allow-untyped-calls, allow-untyped-defs
 
 import json
 import os
@@ -6,6 +6,7 @@ import signal
 import sys
 from collections import defaultdict
 from datetime import datetime, timedelta
+from typing import Any, Tuple
 
 import wptserve
 from wptserve import sslutils
@@ -13,6 +14,7 @@ from wptserve import sslutils
 from . import environment as env
 from . import instruments
 from . import mpcontext
+from . import products
 from . import testloader
 from . import wptcommandline
 from . import wptlogging
@@ -47,7 +49,9 @@ def setup_logging(*args, **kwargs):
     return logger
 
 
-def get_loader(test_paths, product, **kwargs):
+def get_loader(test_paths: wptcommandline.TestPaths,
+               product: products.Product,
+               **kwargs: Any) -> Tuple[testloader.TestQueueBuilder, testloader.TestLoader]:
     run_info_extras = product.run_info_extras(**kwargs)
     base_run_info = wpttest.get_run_info(kwargs["run_info"],
                                          product.name,
@@ -98,9 +102,9 @@ def get_loader(test_paths, product, **kwargs):
     ssl_enabled = sslutils.get_cls(kwargs["ssl_type"]).ssl_enabled
     h2_enabled = wptserve.utils.http2_compatible()
 
-    test_source, chunker_kwargs = testloader.get_test_src(logger=logger,
-                                                          test_groups=test_groups,
-                                                          **kwargs)
+    test_queue_builder, chunker_kwargs = testloader.get_test_queue_builder(logger=logger,
+                                                                           test_groups=test_groups,
+                                                                           **kwargs)
 
     test_loader = testloader.TestLoader(test_manifests=test_manifests,
                                         test_types=kwargs["test_types"],
@@ -118,7 +122,7 @@ def get_loader(test_paths, product, **kwargs):
                                         skip_crash=kwargs["skip_crash"],
                                         skip_implementation_status=kwargs["skip_implementation_status"],
                                         chunker_kwargs=chunker_kwargs)
-    return test_source, test_loader
+    return test_queue_builder, test_loader
 
 
 def list_test_groups(test_paths, product, **kwargs):
@@ -181,7 +185,7 @@ def log_suite_start(tests_by_group, base_run_info, subsuites, run_by_dir):
         logger.add_subsuite(name=name, run_info=subsuite.run_info_extras)
 
 
-def run_test_iteration(test_status, test_loader, test_source,
+def run_test_iteration(test_status, test_loader, test_queue_builder,
                        recording, test_environment, product, kwargs):
     """Runs the entire test suite.
     This is called for each repeat run requested."""
@@ -195,7 +199,7 @@ def run_test_iteration(test_status, test_loader, test_source,
                 tests_by_type[(subsuite_name, test_type)].extend(type_tests_active)
                 tests_by_type[(subsuite_name, test_type)].extend(type_tests_disabled)
 
-    tests_by_group = test_source.cls.tests_by_group(tests_by_type, **test_source.kwargs)
+    tests_by_group = test_queue_builder.tests_by_group(tests_by_type)
 
     log_suite_start(tests_by_group,
                     test_loader.base_run_info,
@@ -271,7 +275,7 @@ def run_test_iteration(test_status, test_loader, test_source,
             tests_to_run = unexpected_fail_tests
             if sum(len(tests) for tests in tests_to_run.values()) == 0:
                 break
-            tests_by_group = test_source.cls.tests_by_group(tests_to_run, **kwargs)
+            tests_by_group = test_queue_builder.tests_by_group(tests_to_run)
 
             logger.suite_end()
 
@@ -281,7 +285,7 @@ def run_test_iteration(test_status, test_loader, test_source,
                             kwargs["run_by_dir"])
 
         with ManagerGroup("web-platform-tests",
-                          test_source,
+                          test_queue_builder,
                           test_implementations,
                           retry_index,
                           kwargs["rerun"],
@@ -386,14 +390,14 @@ def run_tests(config, product, test_paths, **kwargs):
             env_extras.append(FontInstaller(
                 logger,
                 font_dir=kwargs["font_dir"],
-                ahem=os.path.join(test_paths["/"]["tests_path"], "fonts/Ahem.ttf")
+                ahem=os.path.join(test_paths["/"].tests_path, "fonts/Ahem.ttf")
             ))
 
         recording.set(["startup", "load_tests"])
 
-        test_source, test_loader = get_loader(test_paths,
-                                              product,
-                                              **kwargs)
+        test_queue_builder, test_loader = get_loader(test_paths,
+                                                     product,
+                                                     **kwargs)
 
         test_status = TestStatus()
         repeat = kwargs["repeat"]
@@ -472,9 +476,13 @@ def run_tests(config, product, test_paths, **kwargs):
                 elif repeat > 1:
                     logger.info(f"Repetition {test_status.repeated_runs} / {repeat}")
 
-                iter_success = run_test_iteration(test_status, test_loader, test_source,
+                iter_success = run_test_iteration(test_status,
+                                                  test_loader,
+                                                  test_queue_builder,
                                                   recording,
-                                                  test_environment, product, kwargs)
+                                                  test_environment,
+                                                  product,
+                                                  kwargs)
                 # if there were issues with the suite run(tests not loaded, etc.) return
                 if not iter_success:
                     return False, test_status
diff --git a/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py b/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
index ba038a25ae3..6df1c4cf2cd 100644
--- a/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
+++ b/tests/wpt/tests/tools/wptrunner/wptrunner/wpttest.py
@@ -392,6 +392,19 @@ class Test(ABC):
             prefs.update(meta_prefs)
         return prefs
 
+    def expected_fail_message(self, subtest):
+        if subtest is None:
+            return None
+
+        metadata = self._get_metadata(subtest)
+        if metadata is None:
+            return None
+
+        try:
+            return metadata.get("expected-fail-message")
+        except KeyError:
+            return None
+
     def expected(self, subtest=None):
         if subtest is None:
             default = self.result_cls.default_expected
diff --git a/tests/wpt/tests/uievents/mouse/mousemove_prevent_default_action.tentative.html b/tests/wpt/tests/uievents/mouse/mousemove_prevent_default_action.tentative.html
index 376a110fa5b..4d9772369b7 100644
--- a/tests/wpt/tests/uievents/mouse/mousemove_prevent_default_action.tentative.html
+++ b/tests/wpt/tests/uievents/mouse/mousemove_prevent_default_action.tentative.html
@@ -27,12 +27,12 @@
 
   // Deliberately avoiding mouseup here because the last selectionchange
   // may be fired before or after the mouseup.
-  ["mousedown", "mousemove", "selectionchange", "dragstart"].forEach(ename => {
-    document.addEventListener(ename, logEvents);
-  });
+  document.addEventListener("mousedown", logEvents);
   document.addEventListener("mousemove", e => e.preventDefault());
 
-  promise_test(async () => {
+  promise_test(async test => {
+    document.addEventListener("selectionchange", logEvents);
+    test.add_cleanup(() => { document.removeEventListener("selectionchange", logEvents); });
     event_log = [];
 
     const a = document.getElementById("a");
@@ -53,14 +53,15 @@
 
     await mouseup_promise;
 
-    const expected_events = ["mousemove", "mousedown", "selectionchange",
-        "mousemove", "selectionchange"];
+    const expected_events = ["mousedown", "selectionchange", "selectionchange"];
 
     assert_equals(event_log.toString(), expected_events.toString(),
         "received events");
   }, "selectionchange event firing when mousemove event is prevented");
 
-  promise_test(async () => {
+  promise_test(async test => {
+    document.addEventListener("dragstart", logEvents);
+    test.add_cleanup(() => { document.removeEventListener("dragstart", logEvents); });
     event_log = [];
 
     const b = document.getElementById("b");
@@ -85,7 +86,7 @@
 
     await Promise.race([dragstart_promise, mouseup_promise]);
 
-    const expected_events = ["mousemove", "mousedown", "mousemove", "dragstart"];
+    const expected_events = ["mousedown", "dragstart"];
 
     assert_equals(event_log.toString(), expected_events.toString(),
         "received events");
diff --git a/tests/wpt/tests/uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html b/tests/wpt/tests/uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html
new file mode 100644
index 00000000000..fad82f850d4
--- /dev/null
+++ b/tests/wpt/tests/uievents/mouse/synthetic-mouse-enter-leave-over-out-button-state-after-target-removed.tentative.html
@@ -0,0 +1,240 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<meta name="variant" content="?buttonType=LEFT&button=0&buttons=1">
+<meta name="variant" content="?buttonType=MIDDLE&button=1&buttons=4">
+<title>Testing button state of synthesized mouse(out|over|leave|enter) events</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>
+#parent {
+  background-color: lightseagreen;
+  padding: 0;
+  height: 40px;
+  width: 40px;
+}
+#child {
+  background-color: red;
+  margin: 0;
+  height: 30px;
+  width: 30px;
+}
+</style>
+</head>
+<body>
+<div id="parent"><div id="child">abc</div></div>
+<script>
+const searchParams = new URLSearchParams(document.location.search);
+const buttonType = searchParams.get("buttonType");
+const button = parseInt(searchParams.get("button"));
+const buttons = parseInt(searchParams.get("buttons"));
+
+let events = [];
+function eventToString(data) {
+  if (!data) {
+    return "{}";
+  }
+  return `{ '${data.type}' on '${data.target}': button=${data.button}, buttons=${data.buttons} }`;
+}
+
+function eventsToString(events) {
+  if (!events.length) {
+    return "[]";
+  }
+  let ret = "[";
+  for (const data of events) {
+    if (ret != "[") {
+      ret += ", ";
+    }
+    ret += eventToString(data);
+  }
+  return ret + "]";
+}
+
+function removeEventsBefore(eventType) {
+  while (events[0]?.type != eventType) {
+    events.shift();
+  }
+}
+
+const parentElement = document.getElementById("parent");
+const childElement = document.getElementById("child");
+
+function promiseLayout() {
+  return new Promise(resolve => {
+    (childElement.isConnected ? childElement : parentElement).getBoundingClientRect();
+    requestAnimationFrame(() => requestAnimationFrame(resolve));
+  });
+}
+
+promise_test(async () => {
+  await new Promise(resolve => {
+    addEventListener("load", resolve, { once: true });
+  });
+
+  ["mouseout", "mouseover", "mouseleave", "mouseenter", "mousemove", "mousedown"].forEach(eventType => {
+    parentElement.addEventListener(eventType, event => {
+      if (event.target != parentElement) {
+        return;
+      }
+      events.push({
+        type: event.type,
+        target: "parent",
+        button: event.button,
+        buttons: event.buttons,
+      });
+    });
+    childElement.addEventListener(eventType, event => {
+      if (event.target != childElement) {
+        return;
+      }
+      events.push({
+        type: event.type,
+        target: "child",
+        button: event.button,
+        buttons: event.buttons,
+      });
+    });
+  });
+}, "Setup event listeners and wait for load");
+
+promise_test(async t => {
+  events = [];
+  await promiseLayout();
+  childElement.addEventListener("mousedown", () => childElement.remove(), {once: true});
+  const {x, y} = (function () {
+    const rect = childElement.getBoundingClientRect();
+    return { x: rect.left, y: rect.top };
+  })();
+  const actions = new test_driver.Actions();
+  await actions.pointerMove(10, 10, {origin: childElement})
+               .pointerDown({button: actions.ButtonType[buttonType]})
+               .pause(100) // Allow browsers to synthesize mouseout, etc
+               .pointerUp({button: actions.ButtonType[buttonType]})
+               .send();
+  await promiseLayout();
+  removeEventsBefore("mousedown");
+  test(() => {
+    const maybeMouseDownEvent =
+      events.length && events[0].type == "mousedown" ? events.shift() : undefined;
+    assert_equals(
+      eventToString(maybeMouseDownEvent),
+      eventToString({ type: "mousedown",  target: "child", button, buttons })
+    );
+  }, `${t.name}: mousedown should've been fired`);
+  assert_true(events.length > 0, `${t.name}: Some events should've been fired after mousedown`);
+  test(() => {
+    // Before `mousedown` is fired, both parent and child must have received
+    // `mouseenter`, only the child must have received `mouseover`.  Then, the
+    // child is now moved away by the `mousedown` listener.  Therefore,
+    // `mouseout` and `mouseleave` should be fired on the child as the spec of
+    // UI Events defines. Then, they are not a button press events.  Therefore,
+    // the `button` should be 0, but buttons should be set to 4 because of
+    // pressing the middle button.
+    let mouseOutOrLeave = [];
+    while (events[0]?.type == "mouseout" || events[0]?.type == "mouseleave") {
+      mouseOutOrLeave.push(events.shift());
+    }
+    assert_equals(
+      eventsToString(mouseOutOrLeave),
+      eventsToString([
+        { type: "mouseout",   target: "child", button: 0, buttons },
+        { type: "mouseleave", target: "child", button: 0, buttons },
+      ])
+    );
+  }, `${t.name}: mouseout and mouseleave should've been fired on the removed child`);
+  test(() => {
+    // And `mouseover` should be fired on the parent as the spec of UI Events
+    // defines.
+    let mouseOver = [];
+    while (events[0]?.type == "mouseover") {
+      mouseOver.push(events.shift());
+    }
+    assert_equals(
+      eventsToString(mouseOver),
+      eventsToString([{ type: "mouseover",  target: "parent", button: 0, buttons }])
+    );
+  }, `${t.name}: mouseover should've been fired on the parent`);
+  test(() => {
+    // On the other hand, it's unclear about `mouseenter`.  The mouse cursor has
+    // never been moved out from the parent.  Therefore, it shouldn't be fired
+    // on the parent ideally, but all browsers do not pass this test and there
+    // is no clear definition about this case.
+    let mouseEnter = [];
+    while (events.length && events[0].type == "mouseenter") {
+      mouseEnter.push(events.shift());
+    }
+    assert_equals(eventsToString(mouseEnter), eventsToString([]));
+  }, `${t.name}: mouseenter should not have been fired on the parent`);
+  assert_equals(eventsToString(events), eventsToString([]), "All events should've been checked");
+  parentElement.appendChild(childElement);
+}, "Removing an element at mousedown");
+
+promise_test(async t => {
+  events = [];
+  await promiseLayout();
+  childElement.addEventListener("mouseup", () => childElement.remove(), {once: true});
+  const {x, y} = (function () {
+    const rect = childElement.getBoundingClientRect();
+    return { x: rect.left, y: rect.top };
+  })();
+  const actions = new test_driver.Actions();
+  await actions.pointerMove(10, 10, {origin: childElement})
+               .pointerDown({button: actions.ButtonType[buttonType]})
+               .pointerUp({button: actions.ButtonType[buttonType]})
+               .send();
+  await promiseLayout();
+  removeEventsBefore("mousedown");
+  test(() => {
+    const maybeMouseDownEvent =
+      events.length && events[0].type == "mousedown" ? events.shift() : undefined;
+    assert_equals(
+      eventToString(maybeMouseDownEvent),
+      eventToString({ type: "mousedown",  target: "child", button, buttons })
+    );
+  }, `${t.name}: mousedown should've been fired`);
+  assert_true(events.length > 0, `${t.name}: Some events should've been fired after mousedown`);
+  // Same as the `mousedown` case except `buttons` value because `mouseout`,
+  // `mouseleave`, `mouseover` and `mouseenter` should (or may) be fired
+  // after the `mouseup`.  Therefore, `.buttons` should not have the button
+  // flag.
+  test(() => {
+    let mouseOutOrLeave = [];
+    while (events[0]?.type == "mouseout" || events[0]?.type == "mouseleave") {
+      mouseOutOrLeave.push(events.shift());
+    }
+    assert_equals(
+      eventsToString(mouseOutOrLeave),
+      eventsToString([
+        { type: "mouseout",   target: "child", button: 0, buttons: 0 },
+        { type: "mouseleave", target: "child", button: 0, buttons: 0 },
+      ])
+    );
+  }, `${t.name}: mouseout and mouseleave should've been fired on the removed child`);
+  test(() => {
+    let mouseOver = [];
+    while (events[0]?.type == "mouseover") {
+      mouseOver.push(events.shift());
+    }
+    assert_equals(
+      eventsToString(mouseOver),
+      eventsToString([{ type: "mouseover",  target: "parent", button: 0, buttons: 0 }])
+    );
+  }, `${t.name}: mouseover should've been fired on the parent`);
+  test(() => {
+    let mouseEnter = [];
+    while (events[0]?.type == "mouseenter") {
+      mouseEnter.push(events.shift());
+    }
+    assert_equals(eventsToString(mouseEnter), eventsToString([]));
+  }, `${t.name}: mouseenter should not have been fired on the parent`);
+  assert_equals(eventsToString(events), eventsToString([]), "All events should've been checked");
+  parentElement.appendChild(childElement);
+}, "Removing an element at mouseup");
+</script>
+</body>
+</html>
diff --git a/tests/wpt/tests/url/url-statics-canparse.any.js b/tests/wpt/tests/url/url-statics-canparse.any.js
index c87fcb4f56f..74f3da31f0d 100644
--- a/tests/wpt/tests/url/url-statics-canparse.any.js
+++ b/tests/wpt/tests/url/url-statics-canparse.any.js
@@ -6,23 +6,23 @@
     "expected": false
   },
   {
-    "url": "a:b",
+    "url": "aaa:b",
     "base": undefined,
     "expected": true
   },
   {
     "url": undefined,
-    "base": "a:b",
+    "base": "aaa:b",
     "expected": false
   },
   {
-    "url": "a:/b",
+    "url": "aaa:/b",
     "base": undefined,
     "expected": true
   },
   {
     "url": undefined,
-    "base": "a:/b",
+    "base": "aaa:/b",
     "expected": true
   },
   {
diff --git a/tests/wpt/tests/wai-aria/role/contextual-roles.html b/tests/wpt/tests/wai-aria/role/contextual-roles.html
new file mode 100644
index 00000000000..90b1842f089
--- /dev/null
+++ b/tests/wpt/tests/wai-aria/role/contextual-roles.html
@@ -0,0 +1,91 @@
+<!doctype html>
+<html>
+<head>
+  <title>Contextual 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>Verifies Required Accessibility Parent Roles from <a href="https://w3c.github.io/aria/#scope">5.2.7 Required Accessibility Parent Role</a></p>
+    <p>Also verifies Allowed Accessibility Child Roles from <a href="https://w3c.github.io/aria/#mustContain">5.2.6 Allowed Accessibility Child Roles</a></p>
+
+<!-- Notes for "required context" testing:
+
+    - See Computed Role for more details on role computation when an element lacks required context:
+    https://w3c.github.io/core-aam/#roleMappingComputedRole
+
+    - See ARIA spec for full listing of "Required Accessibility Parent Role" for each element:
+    https://w3c.github.io/aria/#scope
+
+    Identified roles with "Required Context" excluding abstract roles (e.g., child -> parent):
+
+    - caption -> {figure, grid, table, treegrid}
+    - cell -> row
+    - columnheader -> row
+    - gridcell -> row
+    - listitem -> {list, directory} *Note: directory role is deprecated as of ARIA 1.2
+    - menuitem -> {group, menu, menubar}
+    - menuitemcheckbox -> {group, menu, menubar}
+    - menuitemradio -> {group, menu, menubar}
+    - option -> {group, listbox}
+    - row -> {grid, rowgroup, table, treegrid}
+    - rowgroup -> {grid, table, treegrid}
+    - rowheader -> row
+    - tab -> tablist
+    - treeitem -> {group, tree}
+
+    -->
+
+<!-- Required Context Roles Testing  -->
+
+    <!-- caption -> ./table-roles.html -->
+
+    <!-- cell -> ./table-roles.html -->
+
+    <!-- columnheader -> ./grid-roles.html, ./table-roles.html -->
+
+    <!-- gridcell -> ./grid-roles.html -->
+
+    <!-- listitem -> ./list-roles.html -->
+
+    <!-- menuitem, menuitemcheckbox, menuitemradio -> ./menu-roles.html -->
+
+    <!-- option -> ./listbox-roles.html -->
+
+    <!-- row -> ./grid-roles.html, ./table-roles.html  -->
+
+    <!-- rowgroup -> ./grid-roles.html, ./table-roles.html -->
+
+    <!-- rowheader -> ./grid-roles.html, ./table-roles.html -->
+
+    <!-- tab -> ./tab-roles.html -->
+
+    <!-- treeitem -> ./tree-roles.html -->
+
+<!-- Misc Contextual Role Testing  -->
+
+    <!-- Testing contentinfo role computation when scoped to <main> or not:
+    1. If <footer> is a descendant of <main>, it should become 'generic'
+    2. If <footer> is scoped to <body>, it should be 'contentinfo' as expected
+
+    see: https://w3c.github.io/html-aam/#el-footer-ancestorbody -->
+    <main>
+        <footer data-testname="footer element scoped to main element is generic" class="ex-generic">x</footer>
+        <div role="contentinfo" data-testname="contentinfo region scoped to main element is generic" class="ex-generic">x</div>
+    </main>
+
+    <footer data-testname="footer scoped to body element is contentinfo" data-expectedrole="contentinfo" class="ex">x</footer>
+    <div role="contentinfo" data-testname="contentinfo region scoped to body element is contentinfo" data-expectedrole="contentinfo" class="ex">x</div>
+
+<script>
+    AriaUtils.verifyRolesBySelector(".ex");
+    AriaUtils.verifyGenericRolesBySelector(".ex-generic");
+</script>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/wai-aria/role/grid-roles.html b/tests/wpt/tests/wai-aria/role/grid-roles.html
index d26af5d76fd..c40771ba9f2 100644
--- a/tests/wpt/tests/wai-aria/role/grid-roles.html
+++ b/tests/wpt/tests/wai-aria/role/grid-roles.html
@@ -13,6 +13,8 @@
 
   <p>Tests <a href="https://w3c.github.io/aria/#grid">grid</a> and related roles.</p>
 
+  <!-- ARIA table roles tested in ./table-roles.html -->
+
   <div role="grid" data-testname="role is grid" data-expectedrole="grid" class="ex">
     <div role="row" data-testname="role is row (in grid)" data-expectedrole="row" class="ex">
       <span role="columnheader" data-testname="role is columnheader (in row, in grid)" data-expectedrole="columnheader" class="ex">x</span>
@@ -41,12 +43,16 @@
     </div>
   </div>
 
-  <div role="gridcell" data-testname="orphaned gridcell outside the context of row" data-expectedrole="none" class="ex">x</div>
-  <div role="rowheader" data-testname="orphaned rowheader outside the context of row" data-expectedrole="none" class="ex">x</div>
-  <div role="columnheader" data-testname="orphaned columnheader outside the context of row" data-expectedrole="none" class="ex">x</div>
+  <span role="row" data-testname="orphaned row outside the context of table" class="ex-generic">x</span>
+  <span role="rowgroup" data-testname="orphaned rowgroup outside the context of row" class="ex-generic">x</span>
+  <div role="gridcell" data-testname="orphaned div with gridcell role outside the context of row" class="ex-generic">x</div>
+  <button role="gridcell" data-testname="orphaned button with gridcell role outside the context of row" data-expectedrole="button" class="ex">x</button>
+  <div role="rowheader" data-testname="orphaned rowheader outside the context of row" class="ex-generic">x</div>
+  <div role="columnheader" data-testname="orphaned columnheader outside the context of row" class="ex-generic">x</div>
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/wai-aria/role/invalid-roles.html b/tests/wpt/tests/wai-aria/role/invalid-roles.html
index da2370583a2..e16fb677044 100644
--- a/tests/wpt/tests/wai-aria/role/invalid-roles.html
+++ b/tests/wpt/tests/wai-aria/role/invalid-roles.html
@@ -8,29 +8,127 @@
   <script src="/resources/testdriver-vendor.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/wai-aria/scripts/aria-utils.js"></script>
+  <meta charset="utf-8">
 </head>
 <body>
 
-<p>Verifies Invalid Roles from <a href="https://w3c.github.io/aria/#document-handling_author-errors_roles">9.1 Roles - handling author errors</a></p>
+<p>Tests invalid ARIA roles from <a href="https://w3c.github.io/aria/#document-handling_author-errors_roles">9.1 Roles - handling author errors</a>.</p>
 
-<nav role="foo" data-testname="invalid role name foo" data-expectedrole="navigation" class="ex">x</nav>
-<nav role="foo bar" data-testname="multiple invalid role names" data-expectedrole="navigation" class="ex">x</nav>
+<!-- Tests fallback for <nav> when 1/2/3 invalid roles are supplied -->
+<nav role="foo" data-testname="nav with invalid role name foo" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="foo bar" data-testname="nav with two invalid role names" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="foo bar baz" data-testname="nav with three invalid role names" data-expectedrole="navigation" class="ex">x</nav>
 
-<!-- todo: additional invalid roles:
+<!-- Tests fallback for <button> when 1/2/3 invalid roles are supplied -->
+<button role="foo" data-testname="button with invalid role name foo" data-expectedrole="button" class="ex">x</button>
+<button role="foo bar" data-testname="button with two invalid role names" data-expectedrole="button" class="ex">x</button>
+<button role="foo bar baz" data-testname="button with three invalid role names" data-expectedrole="button" class="ex">x</button>
 
-- whitespace tests (including line breaks, tabs, zero-width space, braille space)
-- diacritics
-- zero-width joiners (e.g. ZWJ like emoji variants use)
-- non-western chars
-- RTL strings (Hebrew & Arabic)
-- escaped chars, URL-encoded chars
-- backslash closing quote and other obvious hack attempts
-- etc.
+<!-- Tests fallback for semantically neutral elements when 1/2/3 invalid roles are supplied -->
+<span role="foo" data-testname="span with invalid role name foo" class="ex-generic">x</span>
+<span role="foo bar" data-testname="span with two invalid role names" class="ex-generic">x</span>
+<span role="foo bar baz" data-testname="span with three invalid role names" class="ex-generic">x</span>
+<div role="foo" data-testname="div with invalid role name foo" class="ex-generic">x</div>
+<div role="foo bar" data-testname="div with two invalid role names" class="ex-generic">x</div>
+<div role="foo bar baz" data-testname="div with three invalid role names"class="ex-generic">x</div>
 
--->
+<!-- Whitespace tests with <nav> (including line breaks, tabs, zero-width space, braille space, non-breaking space, standard space) -->
+<nav role=" " data-testname="nav with empty character as role" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#13" data-testname="nav with line break (&#13) character as role" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#9" data-testname="nav with tab (&#9) as role (should be treated as whitespace)" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#8203" data-testname="nav with zero-width space as role (should be treated as whitespace)" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#10240" data-testname="nav with braille space (10240) as role" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#x2800" data-testname="nav with braille space (x2800) as role" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&nbsp" data-testname="nav with non-breaking space (nbsp) as role" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="&#20" data-testname="nav with standard space (nbsp) as role" data-expectedrole="navigation" class="ex">x</nav>
+
+<!-- Escaped whitespace tests with <span> (including line breaks, tabs, zero-width space, braille space, non-breaking space, standard space) -->
+<span role=" " data-testname="span with escaped empty character as role" class="ex-generic">x</span>
+<span role="&#13" data-testname="span with escaped line break (&#13) character as role" class="ex-generic">x</span>
+<span role="&#9" data-testname="span with escaped tab (&#9) as role (should be treated as whitespace)" class="ex-generic">x</span>
+<span role="&#8203" data-testname="span with escaped zero-width space as role (should be treated as whitespace)" class="ex-generic">x</span>
+<span role="&#10240" data-testname="span with escaped braille space (10240) as role" class="ex-generic">x</span>
+<span role="&#x2800" data-testname="span with escaped braille space (x2800) as role" class="ex-generic">x</span>
+<span role="&nbsp" data-testname="span with escaped non-breaking space (nbsp) as role" class="ex-generic">x</span>
+<span role="&#20" data-testname="span with escaped standard space (nbsp) as role" class="ex-generic">x</span>
+
+<!-- Unescaped whitespace tests with <span> (including line breaks, tabs, zero-width space, braille space, non-breaking space, standard space) -->
+  <span role=" " data-testname="span with empty character as role" class="ex-generic">x</span>
+  <span role="
+  " data-testname="span with line break (&#13) character as role" class="ex-generic">x</span>
+  <span role="  " data-testname="span with tab (&#9) as role (should be treated as whitespace)" class="ex-generic">x</span>
+  <span role="‍" data-testname="span with zero-width space as role (should be treated as whitespace)" class="ex-generic">x</span>
+  <span role="⠀" data-testname="span with braille space (10240) as role" class="ex-generic">x</span>
+  <span role=" " data-testname="span with non-breaking space (nbsp) as role" class="ex-generic">x</span>
+  <span role=" " data-testname="span with standard space as role" class="ex-generic">x</span>
+
+<!-- Diacritics with <a> -->
+<a href="#" role="&#771" data-testname="link with role set to tilde diacritic" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="foo&#771" data-testname="link with role foo that has tilde diacritic" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="&#773" data-testname="link with role set to overline diacritic" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="foo&#773" data-testname="link with role foo that has overline diacritic" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="&#813" data-testname="link with role set to circumflex diacritic below" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="foo&#813" data-testname="link with role foo that has circumflex diacritic below" data-expectedrole="link" class="ex">x</a>
+<a href="#" role="button&#771" data-testname="link with role set to button with tilde diacritic" data-expectedrole="link" class="ex">x</a>
+
+<!-- Diacritics with <div> -->
+<div role="&#771" data-testname="div with role set to tilde diacritic" class="ex-generic">x</div>
+<div role="foo&#771" data-testname="div with role foo that has tilde diacritic" class="ex-generic">x</div>
+<div role="button&#771" data-testname="div with role set to button with tilde diacritic" class="ex-generic">x</div>
+<div role="button´" data-testname="div with role set to button with unescaped tilde diacritic" class="ex-generic">x</div>
+
+<!-- Zero-width joiners (e.g., ZWJ like emoji variants use) with <button> -->
+<!-- [sic] role="‍" should include an invisible ZWJ], and role="link‍" ends with an invisible ZWJ. Use caution when editing. -->
+<button role="‍" data-testname="button with role set to zero-width joiner" data-expectedrole="button" class="ex">x</button>
+<button role="link‍" data-testname="button with role set to foo with zero-width joiner" data-expectedrole="button" class="ex">x</button>
+
+<!-- Non-western chars with <nav> -->
+<nav role="Θ" data-testname="nav with role set to theta (Θ)" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="ژ" data-testname="nav with role set to Persian character (ژ)" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="ژ ♮" data-testname="nav with multiple non-latin character roles, Persian character (ژ) and ♮" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="漢字" data-testname="nav with role set to Japanese kanji" data-expectedrole="navigation" class="ex">x</nav>
+
+<!-- Non-western chars with <span> -->
+<span role="Θ" data-testname="span with role set to theta (Θ)" class="ex-generic">x</span>
+<span role="ژ" data-testname="span with role set to Persian character (ژ)" class="ex-generic">x</span>
+<span role="ژ ♮" data-testname="span with multiple non-latin character roles, Persian character (ژ) and ♮" class="ex-generic">x</span>
+<span role="漢字" data-testname="span with role set to Japanese kanji" class="ex-generic">x</span>
+
+<!-- RTL strings (Hebrew & Arabic) with <nav> -->
+<nav role="سلام" data-testname="nav with role set to Arabic text" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="سلام حبيب" data-testname="nav with multiple role assignments set to Arabic text" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="שלום" data-testname="nav with role set to Hebrew text" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="שלום חבר" data-testname="nav with multiple role assignments set to Hebrew text" data-expectedrole="navigation" class="ex">x</nav>
+
+<!-- RTL strings (Hebrew & Arabic) with <div> -->
+<div role="سلام" data-testname="div with role set to Arabic text" class="ex-generic">x</div>
+<div role="سلام حبيب" data-testname="div with multiple role assignments set to Arabic text" class="ex-generic">x</div>
+<div role="שלום" data-testname="div with role set to Hebrew text" class="ex-generic">x</div>
+<div role="שלום חבר" data-testname="div with multiple role assignments set to Hebrew text" class="ex-generic">x</div>
+
+<!-- Escaped chars, URL-encoded chars with <a> -->
+<a href="https://www.apple.com/" role="&amp" data-testname="link with role set to ampersand character" data-expectedrole="link" class="ex">x</a>
+<a href="https://www.apple.com/" role="&lt" data-testname="link with role set to less than angle bracket character" data-expectedrole="link" class="ex">x</a>
+
+<!-- Escaped chars, URL-encoded chars with <span> -->
+<span role="&amp" data-testname="span with role set to ampersand character" class="ex-generic">x</span>
+<span role="&lt" data-testname="span with role set to less than angle bracket character" class="ex-generic">x</span>
+<span role="&" data-testname="span with role set to unescaped ampersand character" class="ex-generic">x</span>
+<span role="<" data-testname="span with role set to unescaped less than angle bracket character" class="ex-generic">x</span>
+
+<!-- Backslash closing quote and other malformed roles with characters with <nav> -->
+<nav role="region\" data-testname="nav with role set to region followed by backslash" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="\region" data-testname="nav with role set to backslash followed by region" data-expectedrole="navigation" class="ex">x</nav>
+<nav role="re/gion" data-testname="nav with role set to region with backslash after e character" data-expectedrole="navigation" class="ex">x</nav>
+
+<!-- Backslash closing quote and other malformed roles with characters with <span> -->
+<span role="region\" data-testname="span with role set to region followed by backslash" class="ex-generic">x</span>
+<span role="\region" data-testname="span with role set to backslash followed by region" class="ex-generic">x</span>
+<span role="re/gion" data-testname="span with role set to region with forward slash after e character" class="ex-generic">x</span>
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/wai-aria/role/list-roles.html b/tests/wpt/tests/wai-aria/role/list-roles.html
index da097ce67e8..71c672c6013 100644
--- a/tests/wpt/tests/wai-aria/role/list-roles.html
+++ b/tests/wpt/tests/wai-aria/role/list-roles.html
@@ -18,6 +18,9 @@
   <div role="listitem" data-testname="last simple listitem" data-expectedrole="listitem" class="ex">x</div>
 </div>
 
+<div role="listitem" data-testname="orphan div with listitem role" class="ex-generic">x</div>
+<p role="listitem" data-testname="orphan p with listitem role" data-expectedrole="paragraph" class="ex">x</p>
+
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
 </script>
diff --git a/tests/wpt/tests/wai-aria/role/menu-roles.html b/tests/wpt/tests/wai-aria/role/menu-roles.html
index 224cf335a05..4af4d8d2ff0 100644
--- a/tests/wpt/tests/wai-aria/role/menu-roles.html
+++ b/tests/wpt/tests/wai-aria/role/menu-roles.html
@@ -65,6 +65,15 @@
      class="ex">x
 </nav>
 
+<button role="menuitem" data-testname="orphan button with menuitem role" data-expectedrole="button" class="ex">x</button>
+<div role="menuitem" data-testname="orphan div with menuitem role" class="ex-generic">x</div>
+
+<button role="menuitemcheckbox" data-testname="orphan button with menuitemcheckbox role" data-expectedrole="button" class="ex">x</button>
+<div role="menuitemcheckbox" data-testname="orphan div with menuitemcheckbox role" class="ex-generic">x</div>
+
+<button role="menuitemradio" data-testname="orphan button with menuitemradio role" data-expectedrole="button" class="ex">x</button>
+<div role="menuitemradio" data-testname="orphan div with menuitemradio role" class="ex-generic">x</div>
+
 <script>
     AriaUtils.verifyRolesBySelector(".ex");
 </script>
diff --git a/tests/wpt/tests/wai-aria/role/role_none_conflict_resolution.html b/tests/wpt/tests/wai-aria/role/role_none_conflict_resolution.html
index efb247fc77c..9e2ee6ccfe5 100644
--- a/tests/wpt/tests/wai-aria/role/role_none_conflict_resolution.html
+++ b/tests/wpt/tests/wai-aria/role/role_none_conflict_resolution.html
@@ -18,19 +18,20 @@
 
 <!-- none with label(global) on paragraph -->
 <p role="none" data-testname="p role none with global attr aria-label (prohibited role)" data-expectedrole="paragraph" aria-label="x" class="ex">x</p>
-<p role="none" data-testname="p role none without global attr aria-label (prohibited role)" data-expectedrole="none" class="ex">x</p>
+<p role="none" data-testname="p role none without global attr aria-label (prohibited role)" class="ex-generic">x</p>
 
 <!-- none with focusable header -->
 <h1 role="none" data-testname="focusable heading role none with tabindex=0" data-expectedrole="heading" tabindex="0" class="ex">x</h1>
 <h1 role="none" data-testname="focusable heading role none with tabindex=-1" data-expectedrole="heading" tabindex="-1" class="ex">x</h1>
-<h1 role="none" data-testname="non-focusable heading role none" data-expectedrole="none" class="ex">x</h1>
+<h1 role="none" data-testname="non-focusable heading role none" class="ex-generic">x</h1>
 
 <!-- none with non-global-->
-<h1 role="none" data-testname="none with non-global" data-expectedrole="none" class="ex" aria-level="2"> Sample Content </h1>
+<h1 role="none" data-testname="none with non-global" class="ex-generic" aria-level="2"> Sample Content </h1>
 
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 
 </body>
diff --git a/tests/wpt/tests/wai-aria/role/synonym-roles.html b/tests/wpt/tests/wai-aria/role/synonym-roles.html
index 06a6a776f45..f9d3d7d0a9a 100644
--- a/tests/wpt/tests/wai-aria/role/synonym-roles.html
+++ b/tests/wpt/tests/wai-aria/role/synonym-roles.html
@@ -15,8 +15,8 @@
 
 <!-- spec resolution https://github.com/w3c/core-aam/issues/166 -->
 
-<div role="none" id="none" data-expectedrole="none" data-testname="none role == computedrole none" class="ex">x</div><!-- preferred -->
-<div role="presentation" id="presentation" data-expectedrole="none" data-testname="synonym presentation role == computedrole none" class="ex">x</div><!-- synonym -->
+<div role="none" id="none" data-testname="none role == computedrole none" class="ex-generic">x</div><!-- preferred -->
+<div role="presentation" id="presentation" data-testname="synonym presentation role == computedrole none" class="ex-generic">x</div><!-- synonym -->
 
 <div role="image" id="image" data-expectedrole="image" data-testname="image role == computedrole image" class="ex">x</div><!-- preferred -->
 <div role="img" id="img" data-expectedrole="image" data-testname="synonym img role == computedrole image" class="ex">x</div><!-- synonym -->
@@ -28,6 +28,7 @@
 
 <script>
 AriaUtils.verifyRolesBySelector(".ex");
+AriaUtils.verifyGenericRolesBySelector(".ex-generic");
 </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/tests/wpt/tests/wai-aria/role/tab-roles.html b/tests/wpt/tests/wai-aria/role/tab-roles.html
index f84504e0b45..e3d14741c84 100644
--- a/tests/wpt/tests/wai-aria/role/tab-roles.html
+++ b/tests/wpt/tests/wai-aria/role/tab-roles.html
@@ -82,6 +82,10 @@
     <div role="tabpanel" data-testname="role is tabpanel as sibling to ul with child role none li elements" data-expectedrole="tabpanel" class="ex">Tab one's stuff</div>
     <div role="tabpanel" data-testname="role is tabpanel as sibling to ul with child role none li elements (duplicate)" data-expectedrole="tabpanel" class="ex">Tab two's stuff</div>
 
+<!--orphan tab semantics -->
+<button role="tab" data-testname="orphan button with tab role" data-expectedrole="button" class="ex">x</button>
+<span role="tab" data-testname="orphan span with tab role" class="ex-generic">x</span>
+
 <script>
     AriaUtils.verifyRolesBySelector(".ex");
 </script>
diff --git a/tests/wpt/tests/wai-aria/role/table-roles.html b/tests/wpt/tests/wai-aria/role/table-roles.html
new file mode 100644
index 00000000000..6ffb94218d6
--- /dev/null
+++ b/tests/wpt/tests/wai-aria/role/table-roles.html
@@ -0,0 +1,156 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Table 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/#table">table</a> and related roles.</p>
+
+<!-- HTML <table> Elements Testing  -->
+
+    <!-- <caption> -> wpt/html-aam/table-roles.html -->
+
+    <!-- <table> -> wpt/html-aam/table-roles.html -->
+    <!-- <tbody> -> wpt/html-aam/table-roles.html -->
+
+    <!-- <td> -> wpt/html-aam/table-roles.html -->
+
+    <!-- <tfoot> -> wpt/html-aam/table-roles.html -->
+
+    <!-- <th> -> wpt/html-aam/table-roles.html -->
+    <!-- <thead> -> wpt/html-aam/table-roles.html -->
+
+    <!-- <tr> -> wpt/html-aam/table-roles.html -->
+
+
+<!-- ARIA Grid Elements Testing  -->
+
+        <!-- Grid roles tested in ./grid-roles.html -->
+
+
+<!-- ARIA Table Roles Testing  -->
+
+    <!-- caption -->
+    <div role="table">
+        <div role="caption" data-testname="div role is caption (in div with table role)" data-expectedrole="caption" class="ex">x</div>
+    </div>
+
+    <p role="caption" data-testname="orphan p role is caption" data-expectedrole="caption" class="ex">x</p>
+
+    <!-- cell -->
+    <div role="table">
+        <div role="rowgroup">
+            <div role="row">
+              <span role="columnheader">x</span>
+              <span role="columnheader">x</span>
+            </div>
+        </div>
+        <div role="rowgroup">
+            <div role="row">
+                <span role="cell" data-testname="span role is cell (in div with row role, in div with rowgroup role, in div with table role)" data-expectedrole="cell" class="ex">x</span>
+                <span role="cell">x</span>
+            </div>
+        </div>
+    </div>
+
+    <span role="cell" data-testname="orphan span role is cell" data-expectedrole="cell" class="ex">x</span>
+
+    <!-- columnheader -->
+    <div role="table">
+        <div role="rowgroup">
+            <div role="row">
+                <span role="columnheader" data-testname="span role is columnheader (in div with row role, in div with rowgroup role, in div with table role)" data-expectedrole="columnheader" class="ex">x</span>
+                <span role="columnheader">x</span>
+                <span role="columnheader">x</span>
+            </div>
+        </div>
+        <div role="rowgroup">
+            <div role="row">
+                <span role="rowheader">x</span>
+                <span role="cell">x</span>
+                <span role="cell">x</span>
+            </div>
+        </div>
+    </div>
+
+    <!-- columnheader, orphaned -> ./grid-roles.html -->
+
+    <!-- row -->
+    <div role="table">
+        <div role="rowgroup">
+            <div role="row" data-testname="div role is row (in div with rowgroup role, in div with table role)" data-expectedrole="row" class="ex">
+                <span role="columnheader">x</span>
+            </div>
+        </div>
+        <div role="rowgroup">
+            <div role="row">
+                <span role="cell">x</span>
+            </div>
+        </div>
+    </div>
+
+    <!-- row, orphaned -> ./grid-roles.html -->
+
+    <!-- rowgroup -->
+    <div role="table">
+        <div role="rowgroup" data-testname="div role is rowgroup (in div with table role)" data-expectedrole="rowgroup" class="ex">
+            <div role="row">
+                <span role="columnheader">x</span>
+                <span role="columnheader">x</span>
+            </div>
+        </div>
+        <div role="rowgroup">
+            <div role="row">
+                <span role="cell">x</span>
+                <span role="cell">x</span>
+            </div>
+        </div>
+    </div>
+
+    <!-- rowgroup, orphaned -> ./grid-roles.html -->
+
+    <!-- rowheader -->
+    <div role="table">
+        <div role="rowgroup">
+            <div role="row">
+                <span role="columnheader">x</span>
+                <span role="columnheader">x</span>
+                <span role="columnheader">x</span>
+            </div>
+        </div>
+        <div role="rowgroup">
+            <div role="row">
+                <span role="rowheader" data-testname="role is rowheader (in div with row role, in div with rowgroup role, in div with table role)" data-expectedrole="rowheader" class="ex">x</span>
+                <span role="cell">x</span>
+                <span role="cell">x</span>
+                <span role="cell">x</span>
+            </div>
+        </div>
+      </div>
+
+    <!-- rowheader, orphaned -> ./grid-roles.html -->
+
+    <!-- table -->
+    <div role="table" data-testname="div role is table" data-expectedrole="table" class="ex">
+        <div role="row">
+            <span role="columnheader">x</span>
+            <span role="columnheader">x</span>
+        </div>
+        <div role="row">
+            <span role="cell">x</span>
+            <span role="cell">x</span>
+        </div>
+    </div>
+
+<script>
+    AriaUtils.verifyRolesBySelector(".ex");
+</script>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/tests/wpt/tests/wai-aria/role/tree-roles.html b/tests/wpt/tests/wai-aria/role/tree-roles.html
index 9613312e9bd..eb1084040de 100644
--- a/tests/wpt/tests/wai-aria/role/tree-roles.html
+++ b/tests/wpt/tests/wai-aria/role/tree-roles.html
@@ -103,6 +103,7 @@
 </table>
 
 <nav role="treeitem" data-testname="orphaned treeitem outside the context of tree" data-expectedrole="navigation" class="ex">x</nav>
+<button role="treeitem" data-testname="orphaned button with treeitem role outside tree context" data-expectedrole="button" class="ex">x</button>
 
 <script>
   AriaUtils.verifyRolesBySelector(".ex");
diff --git a/tests/wpt/tests/web-animations/resources/timing-utils.js b/tests/wpt/tests/web-animations/resources/timing-utils.js
index d7267f94f2d..fba62a1f6d8 100644
--- a/tests/wpt/tests/web-animations/resources/timing-utils.js
+++ b/tests/wpt/tests/web-animations/resources/timing-utils.js
@@ -37,3 +37,16 @@ function assert_default_timing_except(effect, propertiesToSkip) {
     );
   }
 }
+
+function waitForAnimationTime(animation, time) {
+  return new Promise((resolve) => {
+    function raf() {
+      if (animation.currentTime < time) {
+        requestAnimationFrame(raf);
+      } else {
+        resolve();
+      }
+    }
+    requestAnimationFrame(raf);
+  });
+}
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js
new file mode 100644
index 00000000000..679480b480d
--- /dev/null
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-registerprocessor-constructor.https.window.js
@@ -0,0 +1,33 @@
+'use strict';
+
+// https://crbug.com/1078902: this test verifies two TypeError cases from
+// registerProcessor() method:
+// - When a given parameter is not a Function.
+// - When a given parameter is not a constructor.
+const TestDescriptions = [
+  'The parameter should be of type "Function".',
+  'The class definition of AudioWorkletProcessor should be a constructor.'
+];
+
+// See `register-processor-exception.js` file for the test details.
+promise_test(async () => {
+  const context = new AudioContext();
+  await context.audioWorklet.addModule(
+      './processors/register-processor-typeerrors.js');
+  const messenger = new AudioWorkletNode(context, 'messenger-processor');
+
+  return new Promise(resolve => {
+    let testIndex = 0;
+    messenger.port.onmessage = (event) => {
+      const exception = event.data;
+      assert_equals(exception.name, 'TypeError',
+                    TestDescriptions[testIndex]);
+      if (++testIndex === TestDescriptions.length) {
+        resolve();
+      }
+    };
+
+    // Start the test on AudioWorkletGlobalScope.
+    messenger.port.postMessage({});
+  });
+}, 'Verifies two TypeError cases from registerProcessor() method.');
diff --git a/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/register-processor-typeerrors.js b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/register-processor-typeerrors.js
new file mode 100644
index 00000000000..93894842fcf
--- /dev/null
+++ b/tests/wpt/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/register-processor-typeerrors.js
@@ -0,0 +1,39 @@
+// For cross-thread messaging.
+class MessengerProcessor extends AudioWorkletProcessor {
+  constructor() {
+    super();
+    this.port.onmessage = this.startTest.bind(this);
+  }
+
+  process() {}
+
+  startTest(message) {
+    runRegisterProcessorTest(this.port);
+  }
+}
+
+function runRegisterProcessorTest(messagePort) {
+  try {
+    // TypeError when a given parameter is not a Function.
+    const DummyObject = {};
+    registerProcessor('type-error-on-object', DummyObject);
+  } catch (exception) {
+    messagePort.postMessage({
+      name: exception.name,
+      message: exception.message
+    });
+  }
+
+  try {
+    // TypeError When a given parameter is a Function, but not a constructor.
+    const DummyFunction = () => {};
+    registerProcessor('type-error-on-function', DummyFunction);
+  } catch (exception) {
+    messagePort.postMessage({
+      name: exception.name,
+      message: exception.message
+    });
+  }
+}
+
+registerProcessor('messenger-processor', MessengerProcessor);
diff --git a/tests/wpt/tests/webauthn/createcredential-prf.https.html b/tests/wpt/tests/webauthn/createcredential-prf.https.html
index 7243e088d40..ac2d5b5f360 100644
--- a/tests/wpt/tests/webauthn/createcredential-prf.https.html
+++ b/tests/wpt/tests/webauthn/createcredential-prf.https.html
@@ -37,6 +37,31 @@ standardSetup(function() {
     });
     return promise_rejects_dom(t, "NotSupportedError", promise);
   }, "navigator.credentials.create() with nonsensical evalByCredential");
+
+  promise_test(async t => {
+    // Evaluating the PRF at creation time is not supported by security keys
+    // because it cannot be expressed with the CTAP2 hmac-secret extension,
+    // but it is defined at the WebAuthn level.
+
+    const credential = await createCredential({
+      options: {
+        publicKey: {
+          extensions: {
+            prf: {eval: {first: new Uint8Array([1,2,3,4]).buffer}},
+          },
+        },
+      },
+    });
+    assert_true(credential.getClientExtensionResults().prf.enabled,
+                "prf.enabled");
+    assert_true('results' in credential.getClientExtensionResults().prf,
+                "has results");
+    assert_true('first' in credential.getClientExtensionResults().prf.results,
+                "has results.first");
+    assert_equals(
+        credential.getClientExtensionResults().prf.results.first.byteLength, 32,
+        "correct length output");
+  }, "navigator.credentials.create() with eval");
 }, {
   protocol: "ctap2_1",
   extensions: ["prf"],
diff --git a/tests/wpt/tests/webcodecs/transfering.https.any.js b/tests/wpt/tests/webcodecs/transfering.https.any.js
index b127670d7b4..acd27381055 100644
--- a/tests/wpt/tests/webcodecs/transfering.https.any.js
+++ b/tests/wpt/tests/webcodecs/transfering.https.any.js
@@ -184,4 +184,53 @@ promise_test(async t => {
   for (let i = 0; i < chunk.byteLength; i++) {
     assert_equals(expected_data[i], output_data[i], `expected_data[${i}]`);
   }
-}, 'Test transfering ArrayBuffer to EncodedVideoChunk');
\ No newline at end of file
+}, 'Test transfering ArrayBuffer to EncodedVideoChunk');
+
+promise_test(async t => {
+  const bytes = [0xBA, 0xDF, 0x00, 0xD0, 0xBA, 0xDF, 0x01, 0xD0, 0xBA, 0xDF];
+  let data = new Uint8Array(bytes);
+  let unused_buffer = new ArrayBuffer(123);
+  let init = {
+    type: 'key',
+    timestamp: 0,
+    numberOfFrames: data.length,
+    numberOfChannels: 1,
+    sampleRate: 10000,
+    format: 'u8',
+    data: data,
+    transfer: [data.buffer, unused_buffer]
+  };
+
+  assert_equals(data.length, 10, 'data.length');
+  assert_equals(unused_buffer.byteLength, 123, 'unused_buffer.byteLength');
+
+  let audio_data = new AudioData(init);
+  assert_equals(data.length, 0, 'data.length after detach');
+  assert_equals(unused_buffer.byteLength, 0, 'unused_buffer after detach');
+
+  let readback_data = new Uint8Array(bytes.length);
+  audio_data.copyTo(readback_data, {planeIndex: 0, format: 'u8'});
+  let expected_data = new Uint8Array(bytes);
+  for (let i = 0; i < expected_data.length; i++) {
+    assert_equals(expected_data[i], readback_data[i], `expected_data[${i}]`);
+  }
+}, 'Test transfering ArrayBuffer to AudioData');
+
+promise_test(async t => {
+  let unused_buffer = new ArrayBuffer(123);
+  let support = await ImageDecoder.isTypeSupported('image/png');
+  assert_implements_optional(
+      support, 'Optional codec image/png not supported.');
+  let buffer = await fetch('four-colors.png').then(response => {
+    return response.arrayBuffer();
+  });
+
+  let decoder = new ImageDecoder(
+      {data: buffer, type: 'image/png', transfer: [buffer, unused_buffer]});
+  assert_equals(buffer.byteLength, 0, 'buffer.byteLength after detach');
+  assert_equals(unused_buffer.byteLength, 0, 'unused_buffer after detach');
+
+  let result = await decoder.decode();
+  assert_equals(result.image.displayWidth, 320);
+  assert_equals(result.image.displayHeight, 240);
+}, 'Test transfering ArrayBuffer to ImageDecoder.');
diff --git a/tests/wpt/tests/webcodecs/video-encoder-content-hint.https.any.js b/tests/wpt/tests/webcodecs/video-encoder-content-hint.https.any.js
new file mode 100644
index 00000000000..cdc32fe3c64
--- /dev/null
+++ b/tests/wpt/tests/webcodecs/video-encoder-content-hint.https.any.js
@@ -0,0 +1,21 @@
+// META: global=window,dedicatedworker
+
+promise_test(async t => {
+  const config = {
+    codec: 'vp8',
+    width: 1280,
+    height: 720,
+    bitrate: 5000000,
+    bitrateMode: 'constant',
+    framerate: 25,
+    latencyMode: 'realtime',
+    contentHint: 'text',
+  };
+
+  let support = await VideoEncoder.isConfigSupported(config);
+  assert_equals(support.supported, true);
+
+  let new_config = support.config;
+  assert_equals(new_config.codec, config.codec);
+  assert_equals(new_config.contentHint, 'text');
+}, 'Test that contentHint is recognized by VideoEncoder');
diff --git a/tests/wpt/tests/webcodecs/video-encoder-utils.js b/tests/wpt/tests/webcodecs/video-encoder-utils.js
index 7201e054d81..855531a76a6 100644
--- a/tests/wpt/tests/webcodecs/video-encoder-utils.js
+++ b/tests/wpt/tests/webcodecs/video-encoder-utils.js
@@ -37,8 +37,8 @@ function fourColorsFrame(ctx, width, height, text) {
 // later. This is an analog of the most basic bar code.
 function putBlackDots(ctx, width, height, count) {
   ctx.fillStyle = 'black';
-  const dot_size = 10;
-  const step = dot_size * 3;
+  const dot_size = 20;
+  const step = dot_size * 2;
 
   for (let i = 1; i <= count; i++) {
     let x = i * step;
@@ -55,8 +55,8 @@ function validateBlackDots(frame, count) {
   let cnv = new OffscreenCanvas(width, height);
   var ctx = cnv.getContext('2d');
   ctx.drawImage(frame, 0, 0);
-  const dot_size = 10;
-  const step = dot_size * 3;
+  const dot_size = 20;
+  const step = dot_size * 2;
 
   for (let i = 1; i <= count; i++) {
     let x = i * step + dot_size / 2;
@@ -69,7 +69,7 @@ function validateBlackDots(frame, count) {
       y = y -1;
 
     let rgba = ctx.getImageData(x, y, 2, 2).data;
-    const tolerance = 40;
+    const tolerance = 60;
     if ((rgba[0] > tolerance || rgba[1] > tolerance || rgba[2] > tolerance)
       && (rgba[4] > tolerance || rgba[5] > tolerance || rgba[6] > tolerance)
       && (rgba[8] > tolerance || rgba[9] > tolerance || rgba[10] > tolerance)
diff --git a/tests/wpt/tests/webcodecs/videoFrame-canvasImageSource.html b/tests/wpt/tests/webcodecs/videoFrame-canvasImageSource.html
index a60040e56a8..717a0a3643a 100644
--- a/tests/wpt/tests/webcodecs/videoFrame-canvasImageSource.html
+++ b/tests/wpt/tests/webcodecs/videoFrame-canvasImageSource.html
@@ -85,7 +85,11 @@ test(t => {
                     'CSSImageValues are currently always tainted');
 }, 'CSSImageValue constructed VideoFrame');
 
-test(t => {
+promise_test(() => {
+  return new Promise(resolve => onload = resolve);
+}, "Wait for onload event to get access to image data");
+
+promise_test(async t => {
   let frame = new VideoFrame(document.querySelector('img'), {timestamp: 0});
   let canvas = new OffscreenCanvas(frame.displayWidth, frame.displayHeight);
   let ctx = canvas.getContext('2d');
@@ -94,7 +98,7 @@ test(t => {
   frame.close();
 }, 'Image element constructed VideoFrame');
 
-test(t => {
+promise_test(async t => {
   let frame = new VideoFrame(document.querySelector('image'), {timestamp: 0});
   let canvas = new OffscreenCanvas(frame.displayWidth, frame.displayHeight);
   let ctx = canvas.getContext('2d');
diff --git a/tests/wpt/tests/webdriver/tests/bidi/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/__init__.py
index 98a95a37fc3..fd2f704d3e5 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/__init__.py
@@ -11,7 +11,7 @@ def recursive_compare(expected: Any, actual: Any) -> None:
         expected(actual)
         return
 
-    assert type(expected) == type(actual)
+    assert type(expected) is type(actual)
     if type(expected) is list:
         assert len(expected) == len(actual)
         for index, _ in enumerate(expected):
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/clip.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/clip.py
index 4cc83f2c221..5d2385ed4a1 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/clip.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/clip.py
@@ -1,6 +1,6 @@
 import pytest
 from tests.support.image import png_dimensions
-from webdriver.bidi.modules.browsing_context import ElementOptions, ViewportOptions
+from webdriver.bidi.modules.browsing_context import ElementOptions, BoxOptions
 from webdriver.bidi.modules.script import ContextTarget
 
 from . import (
@@ -129,7 +129,7 @@ async def test_clip_viewport(bidi_session, top_context, inline, compare_png_bidi
     )
     reference_data = await bidi_session.browsing_context.capture_screenshot(
         context=top_context["context"],
-        clip=ViewportOptions(
+        clip=BoxOptions(
             x=element_coordinates[0],
             y=element_coordinates[1],
             width=expected_size[0],
@@ -156,7 +156,7 @@ async def test_clip_viewport(bidi_session, top_context, inline, compare_png_bidi
     )
     data = await bidi_session.browsing_context.capture_screenshot(
         context=top_context["context"],
-        clip=ViewportOptions(
+        clip=BoxOptions(
             x=element_coordinates[0],
             y=element_coordinates[1],
             width=element_dimensions[0],
@@ -184,7 +184,7 @@ async def test_clip_viewport(bidi_session, top_context, inline, compare_png_bidi
     )
     new_data = await bidi_session.browsing_context.capture_screenshot(
         context=top_context["context"],
-        clip=ViewportOptions(
+        clip=BoxOptions(
             x=element_coordinates[0],
             y=element_coordinates[1],
             width=element_dimensions[0],
@@ -240,7 +240,7 @@ async def test_clip_viewport_scroll_to(
     )
     new_data = await bidi_session.browsing_context.capture_screenshot(
         context=top_context["context"],
-        clip=ViewportOptions(
+        clip=BoxOptions(
             x=element_coordinates[0],
             y=element_coordinates[1],
             width=element_dimensions[0],
@@ -289,7 +289,7 @@ async def test_clip_viewport_partially_visible(
     )
     new_data = await bidi_session.browsing_context.capture_screenshot(
         context=top_context["context"],
-        clip=ViewportOptions(
+        clip=BoxOptions(
             x=element_coordinates[0],
             y=element_coordinates[1],
             width=expected_size[0],
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/invalid.py
index c6efbbbb7ae..a0c0acc5b4d 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/invalid.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/capture_screenshot/invalid.py
@@ -3,7 +3,7 @@ import pytest
 from ... import get_viewport_dimensions
 
 import webdriver.bidi.error as error
-from webdriver.bidi.modules.browsing_context import ElementOptions, ViewportOptions
+from webdriver.bidi.modules.browsing_context import ElementOptions, BoxOptions
 from webdriver.bidi.modules.script import ContextTarget
 
 pytestmark = pytest.mark.asyncio
@@ -98,7 +98,7 @@ async def test_params_clip_viewport_x_invalid_type(bidi_session, top_context, va
     with pytest.raises(error.InvalidArgumentException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(x=value, y=0, width=0, height=0),
+            clip=BoxOptions(x=value, y=0, width=0, height=0),
         )
 
 
@@ -107,7 +107,7 @@ async def test_params_clip_viewport_y_invalid_type(bidi_session, top_context, va
     with pytest.raises(error.InvalidArgumentException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(x=0, y=value, width=0, height=0),
+            clip=BoxOptions(x=0, y=value, width=0, height=0),
         )
 
 
@@ -118,7 +118,7 @@ async def test_params_clip_viewport_width_invalid_type(
     with pytest.raises(error.InvalidArgumentException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(x=0, y=0, width=value, height=0),
+            clip=BoxOptions(x=0, y=0, width=value, height=0),
         )
 
 
@@ -129,7 +129,7 @@ async def test_params_clip_viewport_height_invalid_type(
     with pytest.raises(error.InvalidArgumentException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(x=0, y=0, width=0, height=value),
+            clip=BoxOptions(x=0, y=0, width=0, height=value),
         )
 
 
@@ -137,7 +137,7 @@ async def test_params_clip_viewport_dimensions_invalid_value(bidi_session, top_c
     with pytest.raises(error.UnableToCaptureScreenException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(x=0, y=0, width=0, height=0),
+            clip=BoxOptions(x=0, y=0, width=0, height=0),
         )
 
 
@@ -149,7 +149,7 @@ async def test_params_clip_viewport_outside_of_window_viewport(
     with pytest.raises(error.UnableToCaptureScreenException):
         await bidi_session.browsing_context.capture_screenshot(
             context=top_context["context"],
-            clip=ViewportOptions(
+            clip=BoxOptions(
                 x=viewport_dimensions["width"],
                 y=viewport_dimensions["height"],
                 width=1,
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 080ef581b33..62e7f8dd574 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
@@ -17,7 +17,7 @@ async def test_not_unsubscribed(bidi_session):
     # Track all received browsingContext.contextCreated events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(CONTEXT_CREATED_EVENT, on_event)
@@ -94,7 +94,7 @@ async def test_evaluate_window_open_with_url(bidi_session, subscribe_events, wai
 async def test_navigate_creates_iframes(bidi_session, subscribe_events, top_context, test_page_multiple_frames):
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(CONTEXT_CREATED_EVENT, on_event)
@@ -142,7 +142,7 @@ async def test_navigate_creates_iframes(bidi_session, subscribe_events, top_cont
 async def test_navigate_creates_nested_iframes(bidi_session, subscribe_events, top_context, test_page_nested_frames):
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(CONTEXT_CREATED_EVENT, on_event)
@@ -200,7 +200,7 @@ async def test_subscribe_to_one_context(
     # Track all received browsingContext.contextCreated events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(CONTEXT_CREATED_EVENT, on_event)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/load/load.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/load/load.py
index d15c23e8fdd..568ee517881 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/load/load.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/load/load.py
@@ -11,7 +11,7 @@ pytestmark = pytest.mark.asyncio
 CONTEXT_LOAD_EVENT = "browsingContext.load"
 
 
-async def test_not_unsubscribed(bidi_session, inline, top_context):
+async def test_unsubscribe(bidi_session, inline, new_tab):
     await bidi_session.session.subscribe(events=[CONTEXT_LOAD_EVENT])
     await bidi_session.session.unsubscribe(events=[CONTEXT_LOAD_EVENT])
 
@@ -25,7 +25,7 @@ async def test_not_unsubscribed(bidi_session, inline, top_context):
 
     url = inline("<div>foo</div>")
     await bidi_session.browsing_context.navigate(
-        context=top_context["context"], url=url
+        context=new_tab["context"], url=url, wait="complete"
     )
 
     wait = AsyncPoll(bidi_session, timeout=0.5)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigation_started/navigation_started.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigation_started/navigation_started.py
index 34f3a6246c8..01e28b1ba03 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigation_started/navigation_started.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/navigation_started/navigation_started.py
@@ -15,6 +15,10 @@ pytestmark = pytest.mark.asyncio
 
 NAVIGATION_STARTED_EVENT = "browsingContext.navigationStarted"
 PAGE_EMPTY = "/webdriver/tests/bidi/browsing_context/support/empty.html"
+PAGE_REDIRECT_HTTP_EQUIV = (
+    "/webdriver/tests/bidi/network/support/redirect_http_equiv.html"
+)
+PAGE_REDIRECTED_HTML = "/webdriver/tests/bidi/network/support/redirected.html"
 
 
 async def test_unsubscribe(bidi_session):
@@ -352,3 +356,86 @@ async def test_invalid_navigation(
     assert navigation_info["navigation"] is not None
 
     await bidi_session.session.unsubscribe(events=[NAVIGATION_STARTED_EVENT])
+
+
+async def test_redirect_http_equiv(
+    bidi_session, subscribe_events, top_context, url
+):
+    await subscribe_events(events=[NAVIGATION_STARTED_EVENT])
+
+    # Track all received browsingContext.navigationStarted events in the events array
+    events = []
+
+    async def on_event(method, data):
+        events.append(data)
+
+    remove_listener = bidi_session.add_event_listener(
+        NAVIGATION_STARTED_EVENT, on_event
+    )
+
+    # PAGE_REDIRECT_HTTP_EQUIV should redirect to PAGE_REDIRECTED_HTML immediately
+    http_equiv_url = url(PAGE_REDIRECT_HTTP_EQUIV)
+    redirected_url = url(PAGE_REDIRECTED_HTML)
+
+    result = await bidi_session.browsing_context.navigate(
+        context=top_context["context"],
+        url=http_equiv_url,
+        wait="complete",
+    )
+
+    # Wait until we receive two events, one for the initial navigation and one for
+    # the http-equiv "redirect".
+    wait = AsyncPoll(bidi_session, timeout=2)
+    await wait.until(lambda _: len(events) >= 2)
+
+    assert len(events) == 2
+    assert_navigation_info(
+        events[0],
+        {
+            "context": top_context["context"],
+            "url": http_equiv_url,
+        },
+    )
+    assert_navigation_info(
+        events[1],
+        {
+            "context": top_context["context"],
+            "url": redirected_url,
+        },
+    )
+
+
+async def test_redirect_navigation(
+    bidi_session, subscribe_events, top_context, url
+):
+    await subscribe_events(events=[NAVIGATION_STARTED_EVENT])
+
+    # Track all received browsingContext.navigationStarted events in the events array
+    events = []
+
+    async def on_event(method, data):
+        events.append(data)
+
+    remove_listener = bidi_session.add_event_listener(
+        NAVIGATION_STARTED_EVENT, on_event
+    )
+
+    html_url = url(PAGE_EMPTY)
+    redirect_url = url(
+        f"/webdriver/tests/support/http_handlers/redirect.py?location={html_url}"
+    )
+
+    result = await bidi_session.browsing_context.navigate(
+        context=top_context["context"],
+        url=redirect_url,
+        wait="complete",
+    )
+
+    assert len(events) == 1
+    assert_navigation_info(
+        events[0],
+        {
+            "context": top_context["context"],
+            "url": redirect_url,
+        },
+    )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/reload/wait.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/reload/wait.py
index 2de09b9735e..1024b787f08 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/reload/wait.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/reload/wait.py
@@ -99,7 +99,7 @@ async def test_slow_page(bidi_session, new_tab, url, wait, expect_timeout,
 
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener_1 = bidi_session.add_event_listener(
@@ -150,7 +150,7 @@ async def test_slow_script_blocks_domContentLoaded(bidi_session, inline,
 
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener_1 = bidi_session.add_event_listener(
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_closed/user_prompt_closed.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_closed/user_prompt_closed.py
index f9283437234..ffbdcec8597 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_closed/user_prompt_closed.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_closed/user_prompt_closed.py
@@ -173,7 +173,7 @@ async def test_subscribe_to_one_context(
     # Track all received browsingContext.userPromptClosed events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(
diff --git a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_opened/user_prompt_opened.py b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_opened/user_prompt_opened.py
index 703f789caaf..a24a1e86aba 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_opened/user_prompt_opened.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/browsing_context/user_prompt_opened/user_prompt_opened.py
@@ -79,6 +79,7 @@ async def test_prompt_default_value(
         "defaultValue": default,
     }
 
+
 @pytest.mark.parametrize("type_hint", ["tab", "window"])
 async def test_subscribe_to_one_context(
     bidi_session, subscribe_events, inline, wait_for_event, type_hint
@@ -90,7 +91,7 @@ async def test_subscribe_to_one_context(
     # Track all received browsingContext.userPromptOpened events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(
@@ -106,7 +107,7 @@ async def test_subscribe_to_one_context(
     # Open a prompt in the different context.
     await bidi_session.browsing_context.navigate(
         context=another_new_context["context"],
-        url=inline(f"<script>window.alert('second tab')</script>"),
+        url=inline("<script>window.alert('second tab')</script>"),
     )
 
     # Make sure we don't receive this event.
@@ -117,7 +118,7 @@ async def test_subscribe_to_one_context(
     # Open a prompt in the subscribed context.
     await bidi_session.browsing_context.navigate(
         context=new_context["context"],
-        url=inline(f"<script>window.alert('first tab')</script>"),
+        url=inline("<script>window.alert('first tab')</script>"),
     )
 
     event = await on_entry
diff --git a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/key.py b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/key.py
index ac3099a1ba3..9a04a1f31d3 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/key.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/key.py
@@ -71,7 +71,7 @@ async def test_key_shadow_tree(bidi_session, top_context, get_test_page, mode, n
 
     shadow_root = await get_shadow_root_from_test_page(bidi_session, top_context, nested)
     input_el = await bidi_session.script.call_function(
-        function_declaration=f"""shadowRoot => {{
+        function_declaration="""shadowRoot => {{
             const input = shadowRoot.querySelector('input');
             input.focus();
             return input;
diff --git a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/pointer_mouse.py b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/pointer_mouse.py
index c0c4d6ff953..0d1902e784b 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/pointer_mouse.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/pointer_mouse.py
@@ -150,7 +150,6 @@ async def test_middle_click(bidi_session, top_context, load_static_test_page):
         actions=actions, context=top_context["context"]
     )
 
-
     events = await get_events(bidi_session, top_context["context"])
     assert len(events) == 3
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/wheel.py b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/wheel.py
index 2da3861f937..e3ece1e2fb0 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/wheel.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/input/perform_actions/wheel.py
@@ -118,7 +118,7 @@ async def test_scroll_shadow_tree(
 
     # Add a simplified event recorder to track events in the test ShadowRoot.
     scrollable = await bidi_session.script.call_function(
-        function_declaration=f"""shadowRoot => {{
+        function_declaration="""shadowRoot => {{
             window.wheelEvents = [];
             const scrollable = shadowRoot.querySelector("#scrollableShadowTree");
             scrollable.addEventListener("wheel",
@@ -158,4 +158,4 @@ async def test_scroll_shadow_tree(
     assert len(events) == 1
     assert events[0]["deltaX"] >= 5
     assert events[0]["deltaY"] >= 10
-    assert events[0]["target"] == "scrollableShadowTreeContent"
\ No newline at end of file
+    assert events[0]["target"] == "scrollableShadowTreeContent"
diff --git a/tests/wpt/tests/webdriver/tests/bidi/log/entry_added/event_buffer.py b/tests/wpt/tests/webdriver/tests/bidi/log/entry_added/event_buffer.py
index a5f038865c7..f0ceeb966df 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/log/entry_added/event_buffer.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/log/entry_added/event_buffer.py
@@ -18,7 +18,7 @@ async def test_console_log_cached_messages(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -72,7 +72,7 @@ async def test_console_log_cached_message_after_refresh(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
index cab997d14d9..f4f0cf295a7 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/__init__.py
@@ -4,7 +4,6 @@ from .. import (
     any_int,
     any_int_or_null,
     any_list,
-    any_list_or_null,
     any_string,
     any_string_or_null,
     recursive_compare,
@@ -203,6 +202,11 @@ def assert_response_data(response_data, expected_response):
         # in assert_request_data
         del expected_response["headers"]
 
+    if response_data["status"] in [401, 407]:
+        assert isinstance(response_data["authChallenges"], list)
+    else:
+        assert "authChallenges" not in response_data
+
     recursive_compare(expected_response, response_data)
 
 
@@ -232,6 +236,7 @@ def assert_response_event(
         expected_request=expected_request,
     )
 
+
 # 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/add_intercept/add_intercept.py b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/add_intercept.py
index b68cf2789b9..ffe88db3085 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/add_intercept.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/add_intercept.py
@@ -4,10 +4,7 @@ import uuid
 import pytest
 from webdriver.bidi.modules.script import ScriptEvaluateResultException
 
-from .. import (
-    assert_before_request_sent_event,
-    assert_response_event,
-)
+from .. import assert_before_request_sent_event
 
 PAGE_EMPTY_HTML = "/webdriver/tests/bidi/network/support/empty.html"
 PAGE_EMPTY_TEXT = "/webdriver/tests/bidi/network/support/empty.txt"
@@ -18,16 +15,14 @@ PAGE_OTHER_TEXT = "/webdriver/tests/bidi/network/support/other.txt"
 @pytest.mark.parametrize("phase", ["beforeRequestSent", "responseStarted"])
 async def test_other_context(
     bidi_session,
-    wait_for_event,
     url,
     top_context,
     add_intercept,
     fetch,
     setup_network_test,
-    phase,
 ):
     # Subscribe to network events only in top_context
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
             "network.responseStarted",
@@ -44,7 +39,7 @@ async def test_other_context(
 
     # Add an intercept.
     text_url = url(PAGE_EMPTY_TEXT)
-    intercept = await add_intercept(
+    await add_intercept(
         phases=["beforeRequestSent"],
         url_patterns=[{"type": "string", "pattern": text_url}],
     )
@@ -61,16 +56,13 @@ async def test_other_context(
 @pytest.mark.asyncio
 @pytest.mark.parametrize("phase", ["beforeRequestSent", "responseStarted"])
 async def test_other_url(
-    bidi_session,
-    wait_for_event,
     url,
-    top_context,
     add_intercept,
     fetch,
     setup_network_test,
     phase,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
             "network.responseStarted",
@@ -80,7 +72,7 @@ async def test_other_url(
 
     # Add an intercept.
     text_url = url(PAGE_EMPTY_TEXT)
-    intercept = await add_intercept(
+    await add_intercept(
         phases=[phase],
         url_patterns=[{"type": "string", "pattern": text_url}],
     )
@@ -95,7 +87,7 @@ async def test_other_url(
 
 
 @pytest.mark.asyncio
-async def test_return_value(bidi_session, add_intercept):
+async def test_return_value(add_intercept):
     intercept = await add_intercept(phases=["beforeRequestSent"], url_patterns=[])
 
     assert isinstance(intercept, str)
@@ -107,12 +99,11 @@ async def test_two_intercepts(
     bidi_session,
     wait_for_event,
     url,
-    top_context,
     add_intercept,
     fetch,
     setup_network_test,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
             "network.responseStarted",
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/phases.py b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/phases.py
index 7dd13a46ac2..c6fba726c6d 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/phases.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/phases.py
@@ -23,7 +23,6 @@ PAGE_EMPTY_TEXT = "/webdriver/tests/bidi/network/support/empty.txt"
     ],
 )
 async def test_request_response_phases(
-    bidi_session,
     wait_for_event,
     url,
     setup_network_test,
@@ -92,10 +91,7 @@ async def test_request_response_phases(
 @pytest.mark.asyncio
 @pytest.mark.parametrize("phase", ["beforeRequestSent", "responseStarted"])
 async def test_not_listening_to_phase_event(
-    bidi_session,
-    wait_for_event,
     url,
-    top_context,
     setup_network_test,
     add_intercept,
     fetch,
@@ -111,11 +107,11 @@ async def test_not_listening_to_phase_event(
     # events.
     events.remove(f"network.{phase}")
 
-    network_events = await setup_network_test(events=events)
+    await setup_network_test(events=events)
 
     # Add an intercept without listening to the corresponding network event
     text_url = url(PAGE_EMPTY_TEXT)
-    intercept = await add_intercept(
+    await add_intercept(
         phases=[phase],
         url_patterns=[{"type": "string", "pattern": text_url}],
     )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/url_patterns.py b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/url_patterns.py
index f32bc8df91d..c16993d1ec3 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/url_patterns.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/add_intercept/url_patterns.py
@@ -58,7 +58,6 @@ def substitute_host(server_config):
     ],
 )
 async def test_pattern_patterns_matching(
-    bidi_session,
     wait_for_event,
     setup_network_test,
     add_intercept,
@@ -67,7 +66,7 @@ async def test_pattern_patterns_matching(
     patterns,
     url_template,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
         ]
@@ -108,7 +107,6 @@ async def test_pattern_patterns_matching(
     ],
 )
 async def test_pattern_patterns_not_matching(
-    bidi_session,
     wait_for_event,
     setup_network_test,
     add_intercept,
@@ -117,7 +115,7 @@ async def test_pattern_patterns_not_matching(
     pattern,
     url_template,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
         ]
@@ -128,7 +126,7 @@ async def test_pattern_patterns_not_matching(
 
     pattern.update({"type": "pattern"})
 
-    intercept = await add_intercept(phases=["beforeRequestSent"], url_patterns=[pattern])
+    await add_intercept(phases=["beforeRequestSent"], url_patterns=[pattern])
 
     on_network_event = wait_for_event("network.beforeRequestSent")
     asyncio.ensure_future(fetch(substitute_host(url_template)))
@@ -161,9 +159,7 @@ async def test_pattern_patterns_not_matching(
     ],
 )
 async def test_string_patterns_matching(
-    bidi_session,
     wait_for_event,
-    url,
     setup_network_test,
     add_intercept,
     fetch,
@@ -171,7 +167,7 @@ async def test_string_patterns_matching(
     pattern,
     url_template,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
         ]
@@ -207,7 +203,6 @@ async def test_string_patterns_matching(
     ],
 )
 async def test_string_patterns_not_matching(
-    bidi_session,
     wait_for_event,
     setup_network_test,
     add_intercept,
@@ -216,14 +211,13 @@ async def test_string_patterns_not_matching(
     pattern,
     url_template,
 ):
-    network_events = await setup_network_test(
+    await setup_network_test(
         events=[
             "network.beforeRequestSent",
         ]
     )
 
-
-    intercept = await add_intercept(
+    await add_intercept(
         phases=["beforeRequestSent"],
         url_patterns=[{"type": "string", "pattern": substitute_host(pattern)}],
     )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/fail_request/__init__.py b/tests/wpt/tests/webdriver/tests/bidi/network/fail_request/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/fail_request/invalid.py b/tests/wpt/tests/webdriver/tests/bidi/network/fail_request/invalid.py
new file mode 100644
index 00000000000..29b653c0923
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/fail_request/invalid.py
@@ -0,0 +1,35 @@
+import pytest
+import webdriver.bidi.error as error
+
+pytestmark = pytest.mark.asyncio
+
+PAGE_EMPTY_TEXT = "/webdriver/tests/bidi/network/support/empty.txt"
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_request_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.network.fail_request(request=value)
+
+
+@pytest.mark.parametrize("value", ["", "foo"])
+async def test_params_request_invalid_value(bidi_session, value):
+    with pytest.raises(error.NoSuchRequestException):
+        await bidi_session.network.fail_request(request=value)
+
+
+async def test_params_request_no_such_request(bidi_session, setup_network_test,
+                                              wait_for_event, fetch, url):
+    await setup_network_test(events=[
+        "network.responseCompleted",
+    ])
+    on_response_completed = wait_for_event("network.responseCompleted")
+
+    text_url = url(PAGE_EMPTY_TEXT)
+    await fetch(text_url)
+
+    response_completed_event = await on_response_completed
+    request = response_completed_event["request"]["request"]
+
+    with pytest.raises(error.NoSuchRequestException):
+        await bidi_session.network.fail_request(request=request)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/remove_intercept/remove_intercept.py b/tests/wpt/tests/webdriver/tests/bidi/network/remove_intercept/remove_intercept.py
index dbb439a9e52..1ac0e5cb3b9 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/remove_intercept/remove_intercept.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/remove_intercept/remove_intercept.py
@@ -69,7 +69,7 @@ async def test_remove_intercept(
     await bidi_session.network.remove_intercept(intercept=intercept)
 
     # The next request should not be blocked
-    on_response_completed = wait_for_event(f"network.responseCompleted")
+    on_response_completed = wait_for_event("network.responseCompleted")
     await fetch(text_url)
     await on_response_completed
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
index fcd5c47d8e5..6bbf8794719 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed.py
@@ -23,7 +23,7 @@ async def test_subscribe_status(bidi_session, top_context, wait_for_event, url,
     # Track all received network.responseCompleted events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener(
@@ -125,7 +125,7 @@ async def test_load_page_twice(
 
 @pytest.mark.parametrize(
     "status, status_text",
-    HTTP_STATUS_AND_STATUS_TEXT,
+    [(status, text) for (status, text) in HTTP_STATUS_AND_STATUS_TEXT if status not in [101, 407]],
 )
 @pytest.mark.asyncio
 async def test_response_status(
@@ -154,6 +154,7 @@ async def test_response_status(
     }
     assert_response_event(
         events[0],
+        expected_request=expected_request,
         expected_response=expected_response,
         redirect_count=0,
     )
@@ -190,6 +191,7 @@ async def test_response_headers(wait_for_event, url, fetch, setup_network_test):
     assert_response_event(
         events[0],
         expected_request=expected_request,
+        expected_response=expected_response,
         redirect_count=0,
     )
 
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed_status.py b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed_status.py
new file mode 100644
index 00000000000..c3e4761bbee
--- /dev/null
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/response_completed/response_completed_status.py
@@ -0,0 +1,53 @@
+#  TODO(#42482): Merge this file with response_completed.py
+#
+# The status codes in this file are currently problematic in some implementations.
+#
+# The only mechanism currently provided by WPT to disable subtests with
+# expectations is to disable the entire file. As such, this file is a copy of
+# response_completed.py with the problematic status codes extracted.
+#
+# Once it is possible to disable subtests, this file should be merged with
+# response_completed.py.
+
+import pytest
+
+from .. import assert_response_event, HTTP_STATUS_AND_STATUS_TEXT
+
+RESPONSE_COMPLETED_EVENT = "network.responseCompleted"
+
+
+@pytest.mark.parametrize(
+    "status, status_text",
+    [(status, text) for (status, text) in HTTP_STATUS_AND_STATUS_TEXT if status in [101, 407]],
+)
+@pytest.mark.asyncio
+async def test_response_status(
+    wait_for_event, url, fetch, setup_network_test, status, status_text
+):
+    status_url = url(
+        f"/webdriver/tests/support/http_handlers/status.py?status={status}&nocache={RESPONSE_COMPLETED_EVENT}"
+    )
+
+    network_events = await setup_network_test(events=[RESPONSE_COMPLETED_EVENT])
+    events = network_events[RESPONSE_COMPLETED_EVENT]
+
+    on_response_completed = wait_for_event(RESPONSE_COMPLETED_EVENT)
+    await fetch(status_url)
+    await on_response_completed
+
+    assert len(events) == 1
+    expected_request = {"method": "GET", "url": status_url}
+    expected_response = {
+        "url": status_url,
+        "fromCache": False,
+        "mimeType": "text/plain",
+        "status": status,
+        "statusText": status_text,
+        "protocol": "http/1.1",
+    }
+    assert_response_event(
+        events[0],
+        expected_request=expected_request,
+        expected_response=expected_response,
+        redirect_count=0,
+    )
diff --git a/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py b/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
index d3a84fd6f97..d5dd4e15f97 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/network/response_started/response_started.py
@@ -2,8 +2,6 @@ import asyncio
 
 import pytest
 
-from webdriver.bidi.modules.script import ContextTarget
-
 from tests.support.sync import AsyncPoll
 
 from .. import assert_response_event, HTTP_STATUS_AND_STATUS_TEXT
@@ -30,12 +28,10 @@ async def test_subscribe_status(bidi_session, top_context, wait_for_event, url,
     # Track all received network.responseStarted events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
-    remove_listener = bidi_session.add_event_listener(
-        RESPONSE_STARTED_EVENT, on_event
-    )
+    remove_listener = bidi_session.add_event_listener(RESPONSE_STARTED_EVENT, on_event)
 
     text_url = url(PAGE_EMPTY_TEXT)
     on_response_started = wait_for_event(RESPONSE_STARTED_EVENT)
@@ -113,7 +109,9 @@ async def test_load_page_twice(
 async def test_response_status(
     wait_for_event, url, fetch, setup_network_test, status, status_text
 ):
-    status_url = url(f"/webdriver/tests/support/http_handlers/status.py?status={status}&nocache={RESPONSE_STARTED_EVENT}")
+    status_url = url(
+        f"/webdriver/tests/support/http_handlers/status.py?status={status}&nocache={RESPONSE_STARTED_EVENT}"
+    )
 
     network_events = await setup_network_test(events=[RESPONSE_STARTED_EVENT])
     events = network_events[RESPONSE_STARTED_EVENT]
@@ -134,15 +132,14 @@ async def test_response_status(
     }
     assert_response_event(
         events[0],
+        expected_request=expected_request,
         expected_response=expected_response,
         redirect_count=0,
     )
 
 
 @pytest.mark.asyncio
-async def test_response_headers(
-    wait_for_event, url, fetch, setup_network_test
-):
+async def test_response_headers(wait_for_event, url, fetch, setup_network_test):
     headers_url = url(
         "/webdriver/tests/support/http_handlers/headers.py?header=foo:bar&header=baz:biz"
     )
@@ -172,6 +169,7 @@ async def test_response_headers(
     assert_response_event(
         events[0],
         expected_request=expected_request,
+        expected_response=expected_response,
         redirect_count=0,
     )
 
@@ -209,10 +207,49 @@ async def test_response_mime_type_file(
     )
 
 
+@pytest.mark.asyncio
+async def test_www_authenticate(
+    bidi_session, new_tab, url, wait_for_event, setup_network_test
+):
+    auth_url = url(
+        f"/webdriver/tests/support/http_handlers/authentication.py?realm=testrealm"
+    )
+
+    network_events = await setup_network_test(events=[RESPONSE_STARTED_EVENT])
+    events = network_events[RESPONSE_STARTED_EVENT]
+
+    on_response_started = wait_for_event(RESPONSE_STARTED_EVENT)
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"],
+        url=auth_url,
+        wait="none",
+    )
+
+    await on_response_started
+
+    assert len(events) == 1
+
+    expected_request = {"method": "GET", "url": auth_url}
+    expected_response = {
+        "url": auth_url,
+        "authChallenges": [
+            ({"scheme": "Basic", "realm": "testrealm"}),
+        ],
+    }
+    assert_response_event(
+        events[0],
+        expected_request=expected_request,
+        expected_response=expected_response,
+        redirect_count=0,
+    )
+
+
 @pytest.mark.asyncio
 async def test_redirect(bidi_session, url, fetch, setup_network_test):
     text_url = url(PAGE_EMPTY_TEXT)
-    redirect_url = url(f"/webdriver/tests/support/http_handlers/redirect.py?location={text_url}")
+    redirect_url = url(
+        f"/webdriver/tests/support/http_handlers/redirect.py?location={text_url}"
+    )
 
     network_events = await setup_network_test(events=[RESPONSE_STARTED_EVENT])
     events = network_events[RESPONSE_STARTED_EVENT]
diff --git a/tests/wpt/tests/webdriver/tests/bidi/session/subscribe/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/session/subscribe/contexts.py
index 111e7ef1031..215393603ea 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/session/subscribe/contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/session/subscribe/contexts.py
@@ -17,7 +17,7 @@ async def test_subscribe_to_one_context(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -54,7 +54,7 @@ async def test_subscribe_to_one_context_twice(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -87,7 +87,7 @@ async def test_subscribe_to_one_context_and_then_to_all(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -164,7 +164,7 @@ async def test_subscribe_to_all_context_and_then_to_one_again(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -204,7 +204,7 @@ async def test_subscribe_to_top_context_with_iframes(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -252,7 +252,7 @@ async def test_subscribe_to_child_context(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/contexts.py b/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/contexts.py
index ec38df3bede..4a34b2dca15 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/contexts.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/contexts.py
@@ -23,7 +23,7 @@ async def test_unsubscribe_from_one_context(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -77,7 +77,7 @@ async def test_unsubscribe_from_top_context_with_iframes(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -117,7 +117,7 @@ async def test_unsubscribe_from_child_context(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
@@ -152,7 +152,7 @@ async def test_unsubscribe_from_one_context_after_navigation(
     # Track all received log.entryAdded events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener = bidi_session.add_event_listener("log.entryAdded", on_event)
diff --git a/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/events.py b/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/events.py
index 72851876883..f2394415b34 100644
--- a/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/events.py
+++ b/tests/wpt/tests/webdriver/tests/bidi/session/unsubscribe/events.py
@@ -16,7 +16,7 @@ async def test_unsubscribe_from_module(bidi_session):
     # Track all received browsing context events in the events array
     events = []
 
-    async def on_event(_, data):
+    async def on_event(method, data):
         events.append(data)
 
     remove_listener_contextCreated = bidi_session.add_event_listener(
diff --git a/tests/wpt/tests/webrtc/RTCPeerConnection-setLocalDescription-answer.html b/tests/wpt/tests/webrtc/RTCPeerConnection-setLocalDescription-answer.html
index 32e23326359..4c207890960 100644
--- a/tests/wpt/tests/webrtc/RTCPeerConnection-setLocalDescription-answer.html
+++ b/tests/wpt/tests/webrtc/RTCPeerConnection-setLocalDescription-answer.html
@@ -153,9 +153,9 @@
 
     return pc.createOffer()
     .then(offer =>
-      promise_rejects_dom(t, 'InvalidModificationError',
+      promise_rejects_dom(t, 'InvalidStateError',
         pc.setLocalDescription({ type: 'answer', sdp: offer.sdp })));
-  }, 'Calling setLocalDescription(answer) from stable state should reject with InvalidModificationError');
+  }, 'Calling setLocalDescription(answer) from stable state should reject with InvalidStateError');
 
   promise_test(t => {
     const pc = new RTCPeerConnection();
@@ -167,9 +167,9 @@
       pc.setLocalDescription(offer)
       .then(() => generateAnswer(offer)))
     .then(answer =>
-      promise_rejects_dom(t, 'InvalidModificationError',
+      promise_rejects_dom(t, 'InvalidStateError',
         pc.setLocalDescription(answer)));
-  }, 'Calling setLocalDescription(answer) from have-local-offer state should reject with InvalidModificationError');
+  }, 'Calling setLocalDescription(answer) from have-local-offer state should reject with InvalidStateError');
 
   promise_test(async t => {
     const pc1 = new RTCPeerConnection();
diff --git a/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js b/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js
index c7ace1fca27..88005520b00 100644
--- a/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js
+++ b/tests/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting-async.any.js
@@ -1,5 +1,5 @@
 // META: script=../../../constants.sub.js
-// META: variant=
+// META: variant=?default
 // META: variant=?wpt_flags=h2
 // META: variant=?wss
 
diff --git a/tests/wpt/tests/webusb/usbDevice.https.any.js b/tests/wpt/tests/webusb/usbDevice.https.any.js
index b1b0c133ce1..804af2afb9d 100644
--- a/tests/wpt/tests/webusb/usbDevice.https.any.js
+++ b/tests/wpt/tests/webusb/usbDevice.https.any.js
@@ -1247,3 +1247,60 @@ usb_test((t) => {
         .then(() => promise_rejects_dom(t, 'NotFoundError', device.reset()));
   });
 }, 'resetDevice rejects when called on a disconnected device');
+
+usb_test(async (t) => {
+  const PACKET_COUNT = 4;
+  const PACKET_LENGTH = 8;
+  const {device, fakeDevice} = await getFakeDevice();
+  await device.open();
+  await device.selectConfiguration(2);
+  await device.claimInterface(0);
+  await device.selectAlternateInterface(0, 1);
+  const buffer = new Uint8Array(PACKET_COUNT * PACKET_LENGTH);
+  const packetLengths = new Array(PACKET_COUNT).fill(PACKET_LENGTH);
+  packetLengths[0] = PACKET_LENGTH - 1;
+  await promise_rejects_dom(
+      t, 'DataError', device.isochronousTransferOut(1, buffer, packetLengths));
+}, 'isochronousTransferOut rejects when buffer size exceeds packet lengths');
+
+usb_test(async (t) => {
+  const PACKET_COUNT = 4;
+  const PACKET_LENGTH = 8;
+  const {device, fakeDevice} = await getFakeDevice();
+  await device.open();
+  await device.selectConfiguration(2);
+  await device.claimInterface(0);
+  await device.selectAlternateInterface(0, 1);
+  const buffer = new Uint8Array(PACKET_COUNT * PACKET_LENGTH);
+  const packetLengths = new Array(PACKET_COUNT).fill(PACKET_LENGTH);
+  packetLengths[0] = PACKET_LENGTH + 1;
+  await promise_rejects_dom(
+      t, 'DataError', device.isochronousTransferOut(1, buffer, packetLengths));
+}, 'isochronousTransferOut rejects when packet lengths exceed buffer size');
+
+usb_test(async (t) => {
+  const PACKET_COUNT = 2;
+  const PACKET_LENGTH = 8;
+  const {device, fakeDevice} = await getFakeDevice();
+  await device.open();
+  await device.selectConfiguration(2);
+  await device.claimInterface(0);
+  await device.selectAlternateInterface(0, 1);
+  const packetLengths = [0xffffffff, 1];
+  await promise_rejects_dom(
+      t, 'DataError', device.isochronousTransferIn(1, packetLengths));
+}, 'isochronousTransferIn rejects when packet lengths exceed maximum size');
+
+usb_test(async (t) => {
+  const PACKET_COUNT = 2;
+  const PACKET_LENGTH = 8;
+  const {device, fakeDevice} = await getFakeDevice();
+  await device.open();
+  await device.selectConfiguration(2);
+  await device.claimInterface(0);
+  await device.selectAlternateInterface(0, 1);
+  const buffer = new Uint8Array(PACKET_LENGTH * PACKET_COUNT);
+  const packetLengths = [0xffffffff, 1];
+  await promise_rejects_dom(
+      t, 'DataError', device.isochronousTransferOut(1, buffer, packetLengths));
+}, 'isochronousTransferOut rejects when packet lengths exceed maximum size');
diff --git a/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html b/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html
index e5f79cd8649..f17a9644979 100644
--- a/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html
+++ b/tests/wpt/tests/workers/shared-worker-partitioned-cookies.tentative.https.html
@@ -24,14 +24,14 @@ promise_test(async () => {
   assert_true(document.cookie.includes('unpartitioned=456'));
 
   const worker = new SharedWorker('support/shared-worker-echo-cookies.js');
-  const nextMessage = workerMessageGenerator(worker);
+  const next_message = worker_message_generator(worker);
 
   worker.port.postMessage({type: 'test_message'});
-  const msg1 = await nextMessage();
+  const msg1 = await next_message();
   assert_true(msg1.ok, 'Message passing');
 
   worker.port.postMessage({type: 'echo_cookies_http'});
-  const msg2 = await nextMessage();
+  const msg2 = await next_message();
   assert_true(msg2.ok, 'Get cookies');
   assert_true(
       msg2.cookies.includes('__Host-partitioned'),
@@ -41,7 +41,7 @@ promise_test(async () => {
       'Can access unpartitioned cookie via HTTP');
 
   worker.port.postMessage({type: 'echo_cookies_import'});
-  const msg3 = await nextMessage();
+  const msg3 = await next_message();
   assert_true(msg3.ok, 'Get cookies');
   assert_true(msg3.cookies.includes(
       '__Host-partitioned'),
diff --git a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html
index dc700d31f97..45c01c8937a 100644
--- a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html
+++ b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-3p-frame.html
@@ -11,22 +11,15 @@
 <script>
 
 promise_test(async () => {
-  assert_false(
-      document.cookie.includes('__Host-partitioned=123'),
-      'DOM cannot access partitioned cookie');
-  assert_true(
-      document.cookie.includes('unpartitioned=456'),
-      'DOM can access unpartitioned cookie');
-
   const worker = new SharedWorker('./shared-worker-echo-cookies.js');
-  const nextMessage = workerMessageGenerator(worker);
+  const next_message = worker_message_generator(worker);
 
   worker.port.postMessage({type: 'test_message'});
-  const msg1 = await nextMessage();
+  const msg1 = await next_message();
   assert_true(msg1.ok, 'Message passing');
 
   worker.port.postMessage({type: 'echo_cookies_http'});
-  const msg2 = await nextMessage();
+  const msg2 = await next_message();
   assert_true(msg2.ok, 'Get cookies');
   assert_false(
       msg2.cookies.includes('__Host-partitioned'),
@@ -36,7 +29,7 @@ promise_test(async () => {
       'Can access unpartitioned cookie via HTTP');
 
   worker.port.postMessage({type: 'echo_cookies_import'});
-  const msg3 = await nextMessage();
+  const msg3 = await next_message();
   assert_true(msg3.ok, 'Get cookies');
   assert_false(
       msg3.cookies.includes('__Host-partitioned'),
diff --git a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js
index 3bcdc879e8e..e54d3848ae1 100644
--- a/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js
+++ b/tests/wpt/tests/workers/support/shared-worker-partitioned-cookies-helper.js
@@ -2,11 +2,11 @@
 //
 // Usage:
 //   const worker = new SharedWorker(...);
-//   const nextMessage = workerMessages(worker);
+//   const nextMessage = worker_message_generator(worker);
 //   const msg_1 = await nextMessage();
 //   const msg_2 = await nextMessage();
 //   const msg_3 = await nextMessage();
-function workerMessageGenerator(shared_worker) {
+function worker_message_generator(shared_worker) {
   const buffer = [];
   let resolve = null;
 
diff --git a/tests/wpt/tests/x-frame-options/support/helper.sub.js b/tests/wpt/tests/x-frame-options/support/helper.sub.js
index 23663dd2d07..fa519e4cc16 100644
--- a/tests/wpt/tests/x-frame-options/support/helper.sub.js
+++ b/tests/wpt/tests/x-frame-options/support/helper.sub.js
@@ -89,7 +89,6 @@ function xfo_test({ url, check, message }) {
     }
 
     document.body.append(i);
-    t.add_cleanup(() => i.remove());
   }, message);
 }
 
diff --git a/tests/wpt/tests/x-frame-options/support/nested.py b/tests/wpt/tests/x-frame-options/support/nested.py
index 78c8c18466e..c973254f557 100644
--- a/tests/wpt/tests/x-frame-options/support/nested.py
+++ b/tests/wpt/tests/x-frame-options/support/nested.py
@@ -17,21 +17,20 @@ def main(request, response):
   var i = document.createElement("iframe");
   i.src = "%s/x-frame-options/support/xfo.py?value=%s";
   i.onload = _ => {
-    // Why two rAFs? Because that seems to be enough to stop the
-    // load event from racing with the onmessage event.
-    requestAnimationFrame(_ => {
-      requestAnimationFrame(_ => {
-        // The race condition problem we have is it is possible
-        // that the sub iframe is loaded before the postMessage is
-        // dispatched, as a result, the "Failed" message is sent
-        // out. So the way we fixed is we simply let the timeout
-        // to happen if we expect the "Loaded" postMessage to be
-        // sent
-        if (!gotMessage && %s != true) {
-          window.parent.postMessage("Failed", "*");
-        }
-      });
-    });
+    // Why 100ms timeout? Because that seems to be enough to stop the
+    // load event from racing with the onmessage event, and it's at least
+    // as long as the two renderAnimationFrame calls that used to be here.
+    setTimeout(_ => {
+      // The race condition problem we have is it is possible
+      // that the sub iframe is loaded before the postMessage is
+      // dispatched, as a result, the "Failed" message is sent
+      // out. So the way we fixed is we simply let the timeout
+      // to happen if we expect the "Loaded" postMessage to be
+      // sent
+      if (!gotMessage && %s != true) {
+        window.parent.postMessage("Failed", "*");
+      }
+    }, 100);
   };
   document.body.appendChild(i);
 </script>