[Webkit-unassigned] [Bug 197660] New: A sticky cell inside a sticky table twitches on scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197660

            Bug ID: 197660
           Summary: A sticky cell inside a sticky table twitches on scroll
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nikita.ushkal at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 369286

  --> https://bugs.webkit.org/attachment.cgi?id=369286&action=review

a screencast

Example URL:
https://kw8rl1pyn7.codesandbox.io/

Steps to reproduce the problem:
1. Open an attached url
2. Scroll a table header horizontally

What is the expected behavior?
A fixed white cell should remain in the same position

What went wrong?
A fixed white cell twitches (see the attached video)

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