[Webkit-unassigned] [Bug 66285] New: Implement proper handling of events which happen in children of shadow hosts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66285

           Summary: Implement proper handling of events which happen in
                    children of shadow hosts
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: dglazkov at chromium.org, rolandsteiner at chromium.org,
                    dominicc at chromium.org, morrita at google.com
            Blocks: 59805


A shadow host wrongly stops an event propagation if an event target is an element of its child and the related target is the shadow host itself.

For example, suppose the following details/summary elements.
  <details>
     <summary>summary</summary>
      details
  </details>

When a mouse moves from <summary> to <details>, we should not stop event propagation at <details> element and the event should bubble up.

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