[Webkit-unassigned] [Bug 140560] New: Paint order problem scrolling a relative-position element over a fixed-position element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140560

            Bug ID: 140560
           Summary: Paint order problem scrolling a relative-position
                    element over a fixed-position element
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: stearns at adobe.com

Created attachment 244792
  --> https://bugs.webkit.org/attachment.cgi?id=244792&action=review
test file

A relative-position element passing over a fixed-position element during scrolling paints in the wrong order. In the test file, the red element should always display above the yellow element. If you load the file in Safari 7 and scroll, the yellow obscures the red. If you reload the file with the scroll position set where the elements overlap, the problem is fixed. If you open or close the web inspector when the elements overlap, the problem is fixed.

Does not happen in Safari 6, Firefox or Chrome. Can't reproduce in the view on codepen.io.

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