Bug 263305 – [meta] Implement close requests and close watchers

• Status: REOPENED
• Component: DOM

[Domenic Denicola]

This includes both the new CloseWatcher API, and hooking it up to <dialog> and popover="" so that they have the same behavior. (Including in edge cases like many of them being opened simultaneously.)

See:

* https://html.spec.whatwg.org/#close-requests-and-close-watchers
* https://github.com/WICG/close-watcher
* https://github.com/whatwg/html/pull/9462
* https://github.com/web-platform-tests/wpt/tree/master/close-watcher
* https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/html/closewatcher/
* https://source.chromium.org/chromium/chromium/src/+/main:content/browser/closewatcher/

[Radar WebKit Bug Importer]

<rdar://problem/117163294>

[Luke Warlow]

Pull request: https://github.com/WebKit/WebKit/pull/21939

[Domenic Denicola]

Small spec change coming here to improve web compat: https://github.com/whatwg/html/pull/10291

[Karl Dubost]

Safari is failing that Firefox and Chrome are passing.
https://wpt.fyi/results/close-watcher/user-activation/y-dialog-disconnected.html

[Domenic Denicola]

I mean, Safari is failing all the close watcher tests, right? Not just that one. https://wpt.fyi/results/close-watcher?label=experimental&label=master&aligned

[EWS]

Committed 289529@main (74e0b308c997): <https://commits.webkit.org/289529@main>

Reviewed commits have been landed. Closing PR #21939 and removing active labels.

[Luke Warlow]

Reopening so this can be used to track the full implementation that PR should have used a sub issue rather than the meta one.