[Webkit-unassigned] [Bug 63284] New: [Safari] Negative absolutely positioned elements on RTL pages get clipped

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63284

           Summary: [Safari] Negative absolutely positioned elements on
                    RTL pages get clipped
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com
                CC: simon.fraser at apple.com, jamesr at chromium.org


In fixing bug 60741, I found that Safari (but not Chromium) clips absolute positioned divs.  The layer tree looks correct, but the rendering is wrong.

If an rtl page has overflow and the div is absolutely positioned negatively, then the div will be clipped.  It looks like it is clipped to the initial frame view space.

See the attached example.  Compare with and without compositing.

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