I am implementing the hidden=until-found HTML attribute and beforematch event in Chromium, and I would like to hear WebKit's position on the feature.

Chromestatus entry: https://chromestatus.com/feature/5400510406328320

Spec: https://github.com/whatwg/html/pull/7475

Explainer: https://github.com/WICG/display-locking/blob/main/explainers/hidden-content-explainer.md

Today, users can't search for content inside collapsed or hidden content in websites with find-in-page or scroll to text fragment. If the user wants to search all of the text in a page, it may require manually opening every expanded section before searching. This feature addresses this problem by allowing a variation of the hidden HTML attribute to be set on an element, indicating that it should not be rendered but should allow find-in-page to still search its contents and automatically reveal it.

This is a more generic version of the auto-expanding details feature: https://lists.webkit.org/pipermail/webkit-dev/2021-September/031983.html