[Webkit-unassigned] [Bug 221085] New: White flashings on page on transform3d

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221085

            Bug ID: 221085
           Summary: White flashings on page on transform3d
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: atrigol at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The page flickers after applying some 3d transformations on a container.

To reproduce it:

0- Open Safari on desktop
1- Access https://codesandbox.io/s/react-fullpagejs-example-forked-0w954?file=/src/index.js
2- Access to the full-screen view: https://0w954.csb.app/
3- Scroll up and down 

You'll notice some white rectangles appearing for a fraction of a second.

Video here:
https://drive.google.com/file/d/1VVl9bPsNnk152Fw8Gcwwo1eZdMd8v7Db/view

Safari Version: 14.0.2 (15610.3.7.1.10, 15610)
Mac OS: Catalina 0.15.7 (19H114)

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