[Webkit-unassigned] [Bug 263305] New: Implement close requests and close watchers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=263305

            Bug ID: 263305
           Summary: Implement close requests and close watchers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me

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/

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