[Webkit-unassigned] [Bug 194765] New: Rem is intermittently miscalculated in CSS animations on load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194765

            Bug ID: 194765
           Summary: Rem is intermittently miscalculated in CSS animations
                    on load
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scott at scottkellum.com
                CC: dino at apple.com

Rem units are intermittently miscalculated on load within animations. This happens in Safari 12 both on my Mac and iOS. Occasionally it will render correctly but on refreshes it more often than not renders incorrectly.

Replicate the bug:
https://codepen.io/scottkellum/pen/28d147aa4b21d84367ce832a986cd549?editors=1100


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


If the animation is toggled off and back on or set late with javascript it will work again.

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