Intent to Ship: Update hidden=until-found and details ancestor revealing algorithm

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Joey Arhar

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Aug 7, 2025, 3:32:18 PM (2 days ago) Aug 7
to blink-dev

Contact emails

[email protected]

Explainer

None

Specification

https://github.com/whatwg/html/pull/11457

Summary

The spec recently had some small changes to the revealing algorithms for hidden=until-found and details elements in order to prevent the browser from getting stuck in an infinite loop: https://github.com/whatwg/html/pull/11457



Blink component

Blink>DOM

TAG review

None

TAG review status

Not applicable

Risks



Interoperability and Compatibility

None



Gecko: Positive (https://bugzilla.mozilla.org/show_bug.cgi?id=1980442) Firefox is implementing: https://github.com/web-platform-tests/interop/issues/984#issuecomment-3164919463

WebKit: Shipped/Shipping (https://bugs.webkit.org/show_bug.cgi?id=296797)

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

None



Debuggability

None



Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

Yes

https://github.com/web-platform-tests/wpt/pull/54116



Flag name on about://flags



Finch feature name

AncestorRevealingNewSpec

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/433545121

Estimated milestones

Shipping on desktop141
Shipping on Android141
Shipping on WebView141


Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5179013869993984?gate=5101028303306752

This intent message was generated by Chrome Platform Status.

Mike Taylor

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Aug 8, 2025, 10:33:58 AM (yesterday) Aug 8
to Joey Arhar, blink-dev

LGTM1

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Chris Harrelson

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Aug 8, 2025, 10:55:56 AM (yesterday) Aug 8
to Mike Taylor, Joey Arhar, blink-dev
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