Implement complete CSS default matching - #475
Merged
Merged
Conversation
This was referenced Sep 18, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Closes #474. Parent #257.
Implements complete
:defaultmatching for authored checked inputs, authored selected options, and the first submit-capable control owned by each form, including explicitformownership and iframe/document isolation. Mutation dependencies update direct authored defaults and conservatively recascade for submitter ownership/order changes.Per the current implementation-only directive, tests, WPT/browser/native comparison, builds, performance/lifecycle benchmarks, package qualification, and CI monitoring are deferred and recorded on #474.