[Webkit-unassigned] [Bug 90033] New: Position fixed elements are incorrectly clipped in composited layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90033

           Summary: Position fixed elements are incorrectly clipped in
                    composited layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: HasReduction
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: esprehn at gmail.com
                CC: jamesr at chromium.org


Created an attachment (id=149651)
 --> (https://bugs.webkit.org/attachment.cgi?id=149651&action=review)
Reduction

A position fixed element inside a composited layer will be incorrectly clipped to the containing positioned block. In the attached test case you should see two red boxes but Webkit only draws one because the other is clipped away.

Note: This doesn't appear to be a bug with stacking contexts. The page renders the same with or without a stacking context being created.

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