[Webkit-unassigned] [Bug 190179] New: css animation-duration ignored on hover, but respected on viewport change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190179

            Bug ID: 190179
           Summary: css animation-duration ignored on hover, but respected
                    on viewport change
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdaringe at gmail.com

similar symptoms, different causality report: https://bugs.webkit.org/show_bug.cgi?id=181242

safari ignores animation-duration using the :hover psuedo-class when overwriting an existing duration property.

this is easily demonstrable as shown here: https://youtu.be/F7RpRXddUfI

observe in the video:

- an initial, 240s animation-duration (e.g. slow rotation of the image)
- selection of the :hover class, setting animation-duration to 1.5s.  the rotation speed _does not change_ to a fast rotation.
- toggling away and back from the affected tab. suddenly, the animation-duration is honored, and fast rotation is achieved
- ...the exercise repeats with another value

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