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importNode should allow null customElementRegistry

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

Status: Open.

#1463 In whatwg/dom;

· sorvell opened on Apr 24, 2026

AbortSignal.timeout() may not abort past the timeout

topic: abortingAbortController and AbortSignalAbortController and AbortSignal

Status: Open.

#1461 In whatwg/dom;

· nstepien opened on Mar 22, 2026

Support Temporal.Duration as an argument to timeout-related APIs

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

Status: Open.

#1458 In whatwg/dom;

· lgarron opened on Mar 15, 2026

Document AbortController removal and some improvements

topic: abortingAbortController and AbortSignalAbortController and AbortSignal

Status: Open.

#1449 In whatwg/dom;

· marcoscaceres opened on Feb 5, 2026

Implementations do not match spec behavior for .adoptNode(attr)

topic: nodes

Status: Open.

Bug

#1440 In whatwg/dom;

· Jamesernator opened on Dec 15, 2025

[meta] MutationObserver improvements tracking issue

Status: Open.

#1439 In whatwg/dom;

· LeaVerou opened on Dec 13, 2025

Adopting children of an intentional null shadow root goes wrong

needs testsMoving the issue forward requires someone to write testsMoving the issue forward requires someone to write tests

topic: nodes

Status: Open.

#1429 In whatwg/dom;

· annevk opened on Nov 27, 2025

adoptNode() needs to account for <iframe> and friends

topic: nodes

Status: Open.

#1428 In whatwg/dom;

· annevk opened on Nov 26, 2025

Option to allow querySelector to query shadow roots

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

Status: Open.

#1422 In whatwg/dom;

· LeaVerou opened on Nov 14, 2025

CDATA section can be imported into HTML document

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

Status: Open.

#1420 In whatwg/dom;

· meiqinyan opened on Nov 6, 2025

Allow MutationObserver to observe across <slot>s

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: mutation observers

Status: Open.

#1415 In whatwg/dom;

· jpzwarte opened on Oct 21, 2025

Proposal: moveOrInsertBefore()

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

Status: Open.

#1406 In whatwg/dom;

· justinfagnani opened on Sep 29, 2025