[Webkit-unassigned] [Bug 201234] REGRESSION (Safari 13): webkit-backdrop-filter sometimes leaving empty space between border

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201234

Christian Kaindl <crisscross.kaindl at outlook.de> changed:

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                 CC|                            |crisscross.kaindl at outlook.d
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--- Comment #5 from Christian Kaindl <crisscross.kaindl at outlook.de> ---
Created attachment 397467

  --> https://bugs.webkit.org/attachment.cgi?id=397467&action=review

backdrop-filter rendering bug with box-shadow

This issue is not only present with border-radius, but also when applying a box-shadow to the element. The backdrop-filter is offset by the size of the blur radius in addition to the offset by border-width. In the attachment I only added a box-shadow to Jonathan's HTML attachment, which makes the bug very visible.

This very much impacts our website right now (quantargo.com), because any element with backdrop-filter that also has a shadow looks broken on iOS (Chrome, and Firefox with the `layout.css.backdrop-filter.enabled` flag, work correctly).

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