[Webkit-unassigned] [Bug 263081] New: [popover] element within complex shadow DOM breaks light dismiss calculation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=263081

            Bug ID: 263081
           Summary: [popover] element within complex shadow DOM breaks
                    light dismiss calculation
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: westbrook.johnson at gmail.com

This issue is closely related to https://bugs.webkit.org/show_bug.cgi?id=259261 in that I would have expected the flattened tree calculation added there to have prevented this, but here again, we see the light dismiss calculation for a `[popover="auto"]` element going awry.

As seen in https://codepen.io/Westbrook/pen/JjwVYmr Safari 17 and TP both overreach and close the root popover erroneously when opening the child popover.

Steps:

1) Visit https://codepen.io/Westbrook/pen/JjwVYmr
2) Click the "Show" button.
3) See the "outer" [popover] element open at the center of the page.
4) Click the "Show" button within the initial [popover] element.
5) See the "outer" [popover] element closed due to the light dismiss calculation, preventing the "inner" [popover] element from becoming visible.

If you run the same steps in Chrome, you'll see the "inner" [popover] open over the "outer" [popover] as expected.

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