[Webkit-unassigned] [Bug 203605] New: Safari Mobile: Rendering artifact while scrolling a fixed element with box-shadow animation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203605

            Bug ID: 203605
           Summary: Safari Mobile: Rendering artifact while scrolling a
                    fixed element with box-shadow animation
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeanfelixg at gmail.com

Created attachment 382301

  --> https://bugs.webkit.org/attachment.cgi?id=382301&action=review

small video and html to demonstrate the problem

Safari Mobile Only (iOS 13)

There is a rendering issue when an element with box-shadow animation is in a position fixed parent and scrolling the body.  
Basically, I think some part of the underneath content show through the fixed element background. 
I only get this behaviour when I animate the box-shadow property.

In the attached zip file, there is a video and an html file to reproduce this case.

OS: iOS 13.2
Tested on iPhone 6S and iPhone 11

Thanks.

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