[Webkit-unassigned] [Bug 119380] New: [CSSRegions] Scrolling a fixed positioned region results in painting artifacts

Thu Aug 1 00:13:50 PDT 2013

https://bugs.webkit.org/show_bug.cgi?id=119380

           Summary: [CSSRegions] Scrolling a fixed positioned region
                    results in painting artifacts
           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: mihnea at adobe.com
                CC: WebkitBugTracker at adobe.com
            Blocks: 57312

With the following test case:
<!DOCTYPE html>
<html>
    <head>
        <style>
            #article { -webkit-flow-into: flow; width: 100px; height: 100px; }
            #region { -webkit-flow-from: flow; position: fixed; }
            #scroller { position: absolute; top: 1000px;}
        </style>
    </head>
    <body>
        <div id="article">AAAAA</div>
        <div id="region"></div>
        <div id="scroller">Test</div>
    </body>
</html>

If one scrolls up&&down the document, the content flowed in region is painted incorrectly. Adding background-color or border to the region fixes the problem.

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