[Webkit-unassigned] [Bug 113967] New: Rendering errors and inconsistencies on Chrome mobile with large fixed styling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113967

           Summary: Rendering errors and inconsistencies on Chrome mobile
                    with large fixed styling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Android
        OS/Version: Android
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bobby at mozillafoundation.org


Created an attachment (id=196537)
 --> (https://bugs.webkit.org/attachment.cgi?id=196537&action=review)
 html file demonstrating the bug

A specific combination of large fonts with fixed positioning causes stuttering, ugly artifacts, incorrect cropping and erroneous z-indexing. I've attached an html file to illustrate these problems.

Firefox and Chrome on desktop have no problem rendering the page. However, most mobile browsers break in some way, including webkit-backed ones. Some of the problems:

* The tiled background does not stay fixed
* Text on a lower z-index appears in front for some time, becomes correct after some sort of refresh occurs
* Artifacts appear after scrolling down pretty far, and scrolling back up

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