[Webkit-unassigned] [Bug 125080] New: When preserve-3d is disabled due to the GPU, it should not be reported as supported

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125080

           Summary: When preserve-3d is disabled due to the GPU, it should
                    not be reported as supported
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: me at gvsmirnov.ru


Overview: 

  On *some* linux boxes running on *some* GPUs preserve-3d is broken in Webkit and browsers based on it (Google Chrome, etc). While the browser recognizes this value for (-webkit-)transform-style, it actually fails to render the corresponding page. Works fine in Mac OS and Windows.

  So, webkit should either reject preserve-3d or render it properly.



Steps to reproduce:

  1) Get your hands on a linux box with a not-so-modern GPU (e.g. Gallium 0.4 on AMD REDWOOD)
  2) Run this fiddle: http://jsfiddle.net/bZ5sE/3/



Actual results:

  Only the text "Looks like we have preserve-3d support - you should see red text below"  is displayed. No red text below is seen.



Expected results:

  a) The text "Looks like we have preserve-3d support - you should see red text below" should be displayed. Below it "should be seen only if preserve-3d is supported" should be seen in red

  b) The text "Sad times looks like there is no preserve-3d support - the red text below is probably hidden because of the preserve-3d styles applied." Should be displayed, with no red text following.


Build Date & Platform:

  First time encountered, but not investigated somewhere in April of 2013, in Chromium on Linux, GPU unknown.

Additional Builds and Platforms:

  All tested Linux distros and all tested Webkit-based browsers. Except on a laptop packed with Intel HD Graphics 4000, where everything ran smoothly in all tested browsers.

Additional information:
  Related github issues: https://github.com/Modernizr/Modernizr/issues/1116, https://github.com/jmpressjs/jmpress.js/issues/133#issuecomment-29117140

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