[Webkit-unassigned] [Bug 126262] New: Graphics buffer issue with clip-path and fixed positioned element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126262

           Summary: Graphics buffer issue with clip-path and fixed
                    positioned element
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: krit at webkit.org
                CC: simon.fraser at apple.com, dino at apple.com,
                    rniwa at webkit.org
            Blocks: 126207


Created an attachment (id=220059)
 --> (https://bugs.webkit.org/attachment.cgi?id=220059&action=review)
Example

In the attached example there is a small example where a fixed positioned element is clipped with the clip-path property. It seems like the fixed positioned element is drawn on a graphics buffer and this buffer is not cleared. This leads to artifacts on areas that are clipped away.

Reload the example multiple times to see the issue. In Safari stable the background is always black. In nightlies the background is not stable. It even happened that a video playing in another application show through.

This just happens with "position: fixed".

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