[Webkit-unassigned] [Bug 111329] New: Repaints of frames of a transition or animation do not occur during intensive computation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111329

           Summary: Repaints of frames of a transition or animation do not
                    occur during intensive computation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dtrebbien at gmail.com


Created an attachment (id=191242)
 --> (https://bugs.webkit.org/attachment.cgi?id=191242&action=review)
Test case

Please see the attached test case.  In Safari 6.0.2, Chrome 25.0.1364.152, Firefox 19.0, and IE 10, after clicking OK on the "starting" alert, the transition of background color from white to red begins and runs for 1 second until an intensive string computation starts.  While the string computation is running, no frames of the transition are painted, so the effect is that the background color jumps from a very light red to a deep red color when the string computation finishes.

Opera (version 12.14 tested) seems to be the only browser that continues to paint frames of the transition while the string computation is running.

This issue isn't as noticeable in desktop browsers as it is for mobile browsers, but it can be seen in desktop Chrome if a fair number of DOM modifications are made to set up a page of an HTML5 app.

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