[Webkit-unassigned] [Bug 216776] New: Element is wrongly positioned during animation when dimensions change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216776

            Bug ID: 216776
           Summary: Element is wrongly positioned during animation when
                    dimensions change
           Product: WebKit
           Version: Safari 13
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wart.claes at gmail.com

When animating an element which changes dimensions, the position of the element is not recalculated 
and makes a "jump" at the end of the animation to correct it's position.

It happens in both iOS Safari and Mac OS Safari, but this behavior is different then Firefox and Chrome/Edge.

Example: https://codepen.io/WartClaes/pen/GRZwMxE

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