[Webkit-unassigned] [Bug 225207] New: Regression: animation on pseudo element ruins flex layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225207

            Bug ID: 225207
           Summary: Regression: animation on pseudo element ruins flex
                    layout
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: spam at rozmiarek.pl

Css transition on some border property of pseudo element (eg. border-color or border-width) results in ruined flex layout.

Behavior documented in codepen: https://codepen.io/t100/pen/mdRYXZw (clicking on label should not change elements arrangement, unfortunately that's not true for Safari and Chrome on iOS 14.5).

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