[Webkit-unassigned] [Bug 20047] New: Incorrect rendering during opacity transition on element with positioned childern

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=20047

           Summary: Incorrect rendering during opacity transition on element
                    with positioned childern
           Product: WebKit
           Version: 526+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com


In the attached testcase, a positioned element runs a transition when its
opacity changes on :hover. However, a child element which is positioned snaps
to the final opacity, without showing the transition, which is wrong.

This only happens if:
* the child is positioned
* the target opacity is 1

I think it's related to stacking context changes when opacity hits 1.


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