[Webkit-unassigned] [Bug 183544] New: Discrete animation of content property does not work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183544

            Bug ID: 183544
           Summary: Discrete animation of content property does not work
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zyuzin.vitaly at gmail.com

I try to animate `content` property of ::before pseudoelement.

I set the content property in rule and change its value in keyframes.

It works correct in Firefox and Chrome, but doesn't work in Safari.

Spec says https://drafts.csswg.org/css-transitions/#animatable-properties

"…since the from and to values cannot be interpolated, the animation is done in a single step."

You can watch the bug here: https://codepen.io/juwain/pen/JLozbJ

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