[Webkit-unassigned] [Bug 259261] New: [popover] element within shadow DOM breaks light dismiss calculation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259261

            Bug ID: 259261
           Summary: [popover] element within shadow DOM breaks light
                    dismiss calculation
           Product: WebKit
           Version: Safari Technology Preview
          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

When a [popover] element that is a descendant of an open [popover] element exists within a shadow DOM, the topmost clicked [popover] element (https://html.spec.whatwg.org/multipage/popover.html#topmost-clicked-popover) calculation is no done with the composed path which causes the descendant [popover] element to close the ancestor [popover] element at open time.

You can repro this here: https://codepen.io/Westbrook/pen/BaGrdoq

With the following code:

<button popovertarget="popover" popovertargetaction="toggle">Toggle</button>
<div id="popover" popover>
  <template shadowrootmode="open">
    Outter
    <button popovertarget="popover-2" popovertargetaction="toggle">Toggle</button>
  <div id="popover-2" popover>
    Inner
  </div>
  </template>
</div>

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