Keith Cirkel

Add `ToggleEvent`s to `<dialog>.showModal()`

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It is useful for web authors do determine when their `` elements open and close. `popover` already has `ToggleEvent` which is dispatched when a `popover` opens or closes, but ``...

rewrite accessibility section on invokers

1

This rewrites the a11y section on invokers to be far more comprehensive, detailing the exact intentions we have when it comes to applying various ARIA states to the button, as...

implement contains_key, update, update_or

1

## PR Type Feature ## PR Checklist - [x] Tests for the changes have been added / updated. - [x] Documentation comments have been added / updated. - [x] A...

Provide an AbortSignal that aborts when Nodes become disconnected

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### What problem are you trying to solve? It's quite common to want to bind to event listeners on global objects, or parent objects to take advantages of delegate event...

Add documentation for the "command" and "commandfor" attributes, and "command" event.

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### Description This PR drafts up the documentation for "Invokers" ([OpenUI explainer](https://open-ui.org/components/invokers.explainer/)). This is a new experimental API for enabling buttons to control interactive elements. ### Motivation As this feature...

api.HTMLButtonElement.commandfor - missing spec URL

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### What type of issue is this? Missing specification link (no spec_url property) ### What information was incorrect, unhelpful, or incomplete? This is a backlog issue to resolve the missing...

Should Dialog `.show()` close all popovers?

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### What is the issue with the HTML Standard? Dialog's show method: https://html.spec.whatwg.org/multipage/interactive-elements.html#dom-dialog-show > 1. If [this](https://webidl.spec.whatwg.org/#this) has an [open](https://html.spec.whatwg.org/multipage/interactive-elements.html#attr-dialog-open) attribute and the [is modal](https://html.spec.whatwg.org/multipage/interactive-elements.html#is-modal) flag of [this](https://webidl.spec.whatwg.org/#this) is false,...

Client Side Feature Flags

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### What problem are you trying to solve? Complex websites often use feature flags to gradually roll-out changes to users. These features can be easily toggled on-or-off per-request, or tweaked...

Resync css/css-scoping tests

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#### 33f092c8b6a4b7febf877fcf121b67ae5266e9e6 Resync css/css-scoping tests https://bugs.webkit.org/show_bug.cgi?id=281746 Reviewed by NOBODY (OOPS!). Upstream commit: https://github.com/web-platform-tests/wpt/commit/e2225ae3b2f8a7230777a0f13ca0911a28a87241 * LayoutTests/imported/w3c/resources/resource-files.json: * LayoutTests/imported/w3c/web-platform-tests/css/css-scoping/font-face-001-expected.txt: Added. * LayoutTests/imported/w3c/web-platform-tests/css/css-scoping/font-face-001.html: Added. * LayoutTests/imported/w3c/web-platform-tests/css/css-scoping/font-face-002-expected.txt: Added. * LayoutTests/imported/w3c/web-platform-tests/css/css-scoping/font-face-002.html: Added. * LayoutTests/imported/w3c/web-platform-tests/css/css-scoping/font-face-003-expected.txt: Added....

Resync css/selectors tests

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#### cf62167a9982e4bdf28228c86ae7c5d58f85b997 Resync css/selectors tests https://bugs.webkit.org/show_bug.cgi?id=280639 Reviewed by NOBODY (OOPS!). Upstream commit: https://github.com/web-platform-tests/wpt/commit/8f6b76e576f65d9acce60efeed3af35ef4e438a0 * LayoutTests/TestExpectations: * LayoutTests/imported/w3c/resources/resource-files.json: * LayoutTests/imported/w3c/web-platform-tests/css/selectors/WEB_FEATURES.yml: Added. * LayoutTests/imported/w3c/web-platform-tests/css/selectors/dir-pseudo-on-input-element-expected.txt: * LayoutTests/imported/w3c/web-platform-tests/css/selectors/dir-pseudo-on-input-element.html: * LayoutTests/imported/w3c/web-platform-tests/css/selectors/featureless-001-expected.html: Added. * LayoutTests/imported/w3c/web-platform-tests/css/selectors/featureless-001.html: Added....