[Webkit-unassigned] [Bug 174564] New: click event does not dispatch to parent when child target stops hit testing after mousedown

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174564

            Bug ID: 174564
           Summary: click event does not dispatch to parent when child
                    target stops hit testing after mousedown
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 315605

  --> https://bugs.webkit.org/attachment.cgi?id=315605&action=review

Testcase

See the attached test case. It has a <div> with a child <div>, both the parent and the child have the same initial, overlapping bounds. The parent shows an alert when receiving a "click" event, the child shrinks itself to 25% of its size using a "transform: scale(25%)" style when the ":active" pseudo-class matches. If you click in the center of the parent, the "click" event is dispatched. If you click on the left, top, right or bottom of the parent, there is no "click" event dispatched, seemingly because the original event target, the child, is no longer hit-testing by the time the mouse pointer is released.

Firefox behaves the same as WebKit, but Chrome dispatches the "click" event in all cases, which seems correct to me.

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