[Webkit-unassigned] [Bug 202472] New: Box-shadow filter trail glitch when using CSS transition

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202472

            Bug ID: 202472
           Summary: Box-shadow filter trail glitch when using CSS
                    transition
           Product: WebKit
           Version: Other
          Hardware: Macintosh
               URL: https://jsfiddle.net/vnqpx2rL/1/
                OS: macOS 10.14
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zozulyakviktor at gmail.com
                CC: dino at apple.com

Created attachment 380028

  --> https://bugs.webkit.org/attachment.cgi?id=380028&action=review

unexpected shadow trail

Safari 13.0.1

Given element with:
- box-shadow filter
- transition of CSS property which changes position (e.g. margin-left)

Steps to reproduce:
- change element's CSS property to which transition is applied

Result:
- observe trail left by element's shadow during transition (look at screenshot attached)

Expected:
- no shadow trail

Reproduction: 
- https://jsfiddle.net/vnqpx2rL/1/

Workaround: 
- apply "transform: translateZ(0)" CSS to element (hacky, non obvious)

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