[Webkit-unassigned] [Bug 174288] New: Capture Event Phase unexpected results with Shadow DOM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174288

            Bug ID: 174288
           Summary: Capture Event Phase unexpected results with Shadow DOM
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m.stramel89 at gmail.com

Steps to reproduce the problem:
Here are 3 JsFiddles that show the confusion...

Standard DOM: http://jsfiddle.net/stramel/joqqf2qz/2/  (Fires as expected)
Shadow DOM (Nested): http://jsfiddle.net/stramel/4pn4x4j1/ (Fires reverse expected)
Shadow DOM (Slotted): http://jsfiddle.net/stramel/03fum0gc/ (Fires as expected)

What is the expected behavior?
Parent Capture listener should fire before the child capture listener

What went wrong?
Child fires before the parent when using nested elements and Shadow dom

Did this work before? N/A 

Does this work in other browsers? Yes
 Using the `useCapture` event listener on a child and parent in conjunction with Shadow DOM causes the child to fire before the parent.

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