1724299 - Implement auto-expanding <details>

Status: NEW

(Core :: Find Backend, enhancement)

Description

[Joey Arhar]

In this HTML spec PR, we are making <details> automatically expand for element fragments and find-in-page: https://github.com/whatwg/html/pull/6466
This way, the user can effectively use find-in-page to search for content hidden inside <details> elements without having to manually expand all of them first.
In order to make it performant, the spec PR also suggests using content-visibility:hidden inside <details>'s user agent shadowdom instead of "removing the slot from the rendering" when <details> are closed.

Comment 1

[Release mgmt bot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox::Address Bar' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Clara Guerrero ( Need Info Brindusa Tot Please)]

Hi,
Thank you for opening this enhancement. I will set this as New and waiting for the developers opinion about it.

Thanks for your input.

Comment 3

[Drew Willcoxon :adw]

Not sure whether this belongs in Find Toolbar or Core, but auto-expanding when the find toolbar is used sounds like more of the former...

Comment 4

[Bill Goldstein [:aja] (UTC-6)]

FYI: This is now shipping in Chrome.
From Chrome 97 announcement at https://blog.chromium.org/2021/11/chrome-97-webtransport-new-array-static.html

"Auto-expand Details Elements

Closed details elements are now searchable and can now be linked to. These hidden elements will also automatically expand when find-in-page, ScrollToTextFragment, and element fragment navigation are used."