Bug 238266

Summary:	Implement hidden=until-found HTML attribute and beforematch event
Product:	WebKit	Reporter:	Joey Arhar <jarhar>
Component:	DOM	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	709922234, bogdan.brinza, cdumez, cyb.ai.815, koivisto, mike, oliver.byford, simon.fraser, webkit-bug-importer, webkit, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Joey Arhar 2022-03-23 09:34:08 PDT

This feature was added to the HTML spec here: https://github.com/whatwg/html/pull/7475
Here is an explainer: https://github.com/WICG/display-locking/blob/main/explainers/hidden-content-explainer.md

The "until-found" value for the hidden attribute should make the element content-visibility:hidden instead of display:none. When the browser searches for text via find-in-page or ScrollToTextFragment, it should also search for text in hidden=until-found elements. If find-in-page or ScrollToTextFragment want to scroll to a match inside a hidden=until-found element, it should remove the hidden attribute from the element and fire the "beforematch" event on it in order to reveal the match.

Comment 1 Radar WebKit Bug Importer 2022-03-23 10:01:02 PDT

<rdar://problem/90706206>