[Webkit-unassigned] [Bug 212213] REGRESSION: Delayed updating of the parallax images on this web site

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212213

--- Comment #9 from Antoine Quint <graouts at webkit.org> ---
Created attachment 400441

  --> https://bugs.webkit.org/attachment.cgi?id=400441&action=review

Reduction

Update reduction shows that this is likely an animation timing issue. The test now shows the startTime and progress for each transition before it gets replaced by a new one. If you look at Firefox Nightly, Chrome Canary and WebKit ToT you notice three different things:

    - Firefox: startTime is somewhere between timeline.currentTime for the previous and current frames and as a result progress > 0
    - Chrome: startTime is timeline.currentTime value for the previous frame (with a rounding error) and as a result progress > 0
    - WebKit: startTime is timeline.currentTime value for the _current_ frame and as a result progress = 0

Our transitions update code is probably correct and picks up the current animated value, but that value is the same as the initial value because the animation hasn't progressed yet.

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