[Webkit-unassigned] [Bug 163206] box-shadow rendered incorrectly when backdrop-filter is applied

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163206

Hansol Kim <kimatg at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |kimatg at gmail.com

--- Comment #4 from Hansol Kim <kimatg at gmail.com> ---
I could reproduce the same visual glitch on both iOS/macOS Safari. Seems to have affected both Safari versions on iOS/macOS since updating to iOS 13.4 / macOS 10.15.4 recently. 

Not sure if it's the same issue that existed 4 years ago and if somehow it came back, but in the current issue it seems more in the side of 'backdrop-filter' being affected (incorrectly rendered) when 'box-shadow' property is present on the same element at the same time.

Here's a more comprehensive investigation / test case I made: https://codepen.io/zvuc/pen/abvJWee

More weird things seem to happen in a more complex environment, with multiple nested elements, animations, transitions and transforms... and in such cases similar rendering bug occurs intermittently even when removing all visible box-shadows. It may be a more fundamental redering issue. One thing for sure is that this problem did not exist at all in the previous version.

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