Intent to prototype: Default Accessibility Semantics for Custom Elements

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Adam Vandolder

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Sep 20, 2022, 3:55:18 PM9/20/22

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Summary:

Currently, custom elements lack the ability to set default accessibility semantics that built-in elements have. This feature allows for the setting of defaults through the custom element's ElementInternals via ARIA reflection, without affecting elements that have accessibility attributes set on them directly.

Bug: Bug 1665151
Specification: https://github.com/whatwg/html/pull/4658
Standards Body: WHATWG
Standards position: https://github.com/mozilla/standards-positions/issues/201
Platform coverage: All
Preference: This feature relies on Aria Reflection and so is currently gated behind the accessibility.ARIAReflection.enabled pref.
DevTools bug: n/a

Other browsers:

Blink: Shipping by default as of version 81 (https://chromestatus.com/feature/5962105603751936)
WebKit: Has open implementation bug (https://bugs.webkit.org/show_bug.cgi?id=216570)

web-platform-tests: A surface-level-only test was provided at https://github.com/web-platform-tests/wpt/pull/18223. Deeper tests do not appear possible with WPT currently: https://github.com/web-platform-tests/wpt/issues/7753, so Gecko-specific tests are being written as well.

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