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Expose certain behavioural attributes via ElementInternals

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#11752 In whatwg/html;

· lukewarlow opened on Oct 4, 2025

Proposal: Opt-In Case-Sensitive Parsing for Custom HTML Elements

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

topic: parser

Status: Open.

#11602 In whatwg/html;

· Thaoky opened on Aug 28, 2025

Allow custom-elements to be a labelable element without being form-associated.

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

topic: forms

Status: Open.

#11584 In whatwg/html;

· lukewarlow opened on Aug 20, 2025

The select element doesn't support slotted option elements

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

topic: selectThe <select> elementThe <select> element

topic: shadowRelates to shadow trees (as defined in DOM)Relates to shadow trees (as defined in DOM)

Status: Open.

#11535 In whatwg/html;

· josepharhar opened on Aug 5, 2025

Behavior of <code>innerHTML</code> on element with scoped custom element registry

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#11382 In whatwg/html;

· sorvell opened on Jun 16, 2025

.elementInternals accessor property

accessibilityAffects accessibilityAffects accessibility

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#11040 In whatwg/html;

· WilcoFiers opened on Feb 17, 2025

Replenishment of element queue or backup element queue can be performed for the same element

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#10944 In whatwg/html;

· dSalieri opened on Jan 24, 2025

Custom states &amp; default ARIA for slotted built-ins

accessibilityAffects accessibilityAffects accessibility

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#10723 In whatwg/html;

· LeaVerou opened on Oct 25, 2024

Allow any element to be the child of a custom element (parser weirdness permitting)

a11y-trackerGroup bringing to attention of a11y, or tracked by the a11y Group but not needing response.Group bringing to attention of a11y, or tracked by the a11y Group but not needing response.

document conformance

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#10722 In whatwg/html;

· LeaVerou opened on Oct 25, 2024

Provide some way of changing an elements location in the DOM tree without triggering connect/disconnect CEReactions

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#10475 In whatwg/html;

· keithamus opened on Jul 12, 2024

Provide native validation messages for native validity states on Form Associated Custom Elements

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

Status: Open.

#10360 In whatwg/html;

· KonnorRogers opened on May 23, 2024

Let Form-Associated Custom Elements match :in-range, and :out-of-range pseudo-selectors

addition/proposalNew features or enhancementsNew features or enhancements

topic: custom elementsRelates to custom elements (as defined in DOM and HTML)Relates to custom elements (as defined in DOM and HTML)

topic: selectors

Status: Open.

#10321 In whatwg/html;

· NickGard opened on May 3, 2024