[Webkit-unassigned] [Bug 185074] New: Animating stdDeviation leaves artifacts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185074

            Bug ID: 185074
           Summary: Animating stdDeviation leaves artifacts
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben at deaxon.com
                CC: zimmermann at kde.org

Created attachment 338986

  --> https://bugs.webkit.org/attachment.cgi?id=338986&action=review

Test case

In order to simulate a motion blur, I'm animating the `stdDeviation` attribute of a `feGaussianBlur`. It works well on Firefox and Chrome, but Safari leaves artifacts behind the element as it moves (see test case attached).

It's worth noting promoting the element with `will-change:transform` removes the artifacts, but unfortunately also removes the gaussian blur outside the element.

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