[Webkit-unassigned] [Bug 166055] New: MotionMark / Animometer gives miss-leading results on browsers with prefixed CSS Transforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166055

            Bug ID: 166055
           Summary: MotionMark / Animometer gives miss-leading results on
                    browsers with prefixed CSS Transforms
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: lforschler at apple.com

I was bisecting an issue that was reported to us related to WebKitGTK+ 2.8 obtaining much better results in MotionMark <http://browserbench.org/MotionMark/> than WebKitGTK+ 2.14.

The issue ended being that WebKitGTK+ 2.8 shipped with prefixed CSS Transforms and >= 2.10 shipped with un-prefixed ones.
Meanwhile MotionMark seems to only support the un-prefixed version of the CSS Transforms.

This are the results of WebKitGTK on a laptop on a WebKit build at:

WebKit r181832:
          Animometer:Score:Geometric: 136pt
                    Canvas Arcs:Score: 233pt
                    Canvas Lines:Score: 822pt
                    Design:Score: 62.8pt
                    Focus:Score: 101pt
                    Images:Score: 1.00pt
                    Leaves:Score: 213pt
                    Multiply:Score: 369pt
                    Paths:Score: 832pt
                    Suits:Score: 203pt


WebKit r181831:
          Animometer:Score:Geometric: 373pt
                    Canvas Arcs:Score: 240pt
                    Canvas Lines:Score: 916pt
                    Design:Score: 76.8pt
                    Focus:Score: 46.4pt
                    Images:Score: 220pt
                    Leaves:Score: 8490pt
                    Multiply:Score: 579pt
                    Paths:Score: 853pt
                    Suits:Score: 195pt


On r181832 <https://trac.webkit.org/changeset/181832> which is the revision that removes the prefix for CSS Transforms, all animations are shown correctly.

On r181831 the result is clearly miss-leading. The third animation and the animation with the letters "design" are not correctly shown on the screen.
But the result given to the user is much better.

I think MotionMark/Animometer needs to either:

  * Gain compatibility with old browsers still using prefixed CSS transforms.
  * Be more robust and detect that the animations are actually not happening as expected, therefore it shouldn't increment the performance counter as it does.

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