[Webkit-unassigned] [Bug 194749] New: Relative font size values (em) within CSS animations compound

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194749

            Bug ID: 194749
           Summary: Relative font size values (em) within CSS animations
                    compound
           Product: WebKit
           Version: Safari 12
          Hardware: All
                OS: All
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scott at scottkellum.com
                CC: dino at apple.com

If the font size is set in `em` and the font size within the keyframes of an animation are set in `em` then the values will compound instead of interpolating.

Here is an example: https://codepen.io/scottkellum/pen/7c4e82c2744e9dfc0caf706bc525d83f

Behavior in Safari 12 (iOS and Desktop): the text grows and shrinks.

Expected behavior: the animation is between 2em and 2em so it should do nothing. No change in size should occur.

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