[Webkit-unassigned] [Bug 39119] New: WebKit continues to render accelerated compositing pages in background tabs, but shouldn't

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39119

           Summary: WebKit continues to render accelerated compositing
                    pages in background tabs, but shouldn't
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://webkit.org/blog-files/3d-transforms/poster-circ
                    le.html
        OS/Version: Windows XP
            Status: NEW
          Keywords: NeedsRadar, PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: simon.fraser at apple.com, cmarrin at apple.com,
                    enrica at apple.com


To reproduce:

1. Open <http://webkit.org/blog-files/3d-transforms/poster-circle.html>
2. In another tab, open <http://webkit.org/>
3. Make sure the webkit.org tab is selected
4. Watch Safari's CPU usage in Task Manager

Safari's CPU usage is non-0. This is because WebKit is continuing to render the animation in the poster-circle.html tab. If you turn off accelerated compositing, Safari's CPU usage drops to 0.

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