[Webkit-unassigned] [Bug 160609] New: marquee with "truespeed" animates at > 60fps, hogging CPU

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160609

            Bug ID: 160609
           Summary: marquee with "truespeed" animates at > 60fps, hogging
                    CPU
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

LayoutTests/fast/html/marquee-scroll.html shows a problem where a marquee like:

<marquee width="50%" behavior="slide" bgcolor="cyan" truespeed="" scrollDelay="0">

triggers animation with a zero-delay timer, which is way faster than 60fps and eats CPU.

It's also notable that the test fails to animate the marquee at all, yet still triggers massive numbers of repaints.

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