[Webkit-unassigned] [Bug 97123] New: Incorrect nested layer composition when enabling accelerated fixed-position compositing

Wed Sep 19 11:25:12 PDT 2012

https://bugs.webkit.org/show_bug.cgi?id=97123

           Summary: Incorrect nested layer composition when enabling
                    accelerated fixed-position compositing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hshi at chromium.org
                CC: jamesr at chromium.org

(Originally filed as http://crbug.com/150724)

Chrome 23.0.1271.0
WebKit 537.11 (trunk at 128901)

Command-line flags:
- setAcceleratedCompositingEnabled(true)
- setAcceleratedCompositingForFixedPositionEnabled(true)

HTML page content:
<html><body>
<div style="position:fixed;top:100px;left:100px;">
  <div style="position:fixed;top:100px;left:100px;">
    <input type="text" data-type="number" size="4">
  </div>
</div>
</body></html>

Procedure to reproduce bug:
(1) enter some text in the <input> element so that the text width exceeds the width of the <input>;
(2) press <backspace> key. (or alternatively: select a multi-character substring of the text entered, and enter any key to substitute the substring with a single character) -- this step is to cause a reduction of text width.

Problem observed: suddenly the <input> element is drawn to the wrong place.

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