[Webkit-unassigned] [Bug 216679] New: Corrupted rendering behavior on GitHub

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216679

            Bug ID: 216679
           Summary: Corrupted rendering behavior on GitHub
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: marcos at marcosc.com

Created attachment 409100

  --> https://bugs.webkit.org/attachment.cgi?id=409100&action=review

Video showing rendering error

(Safari 14 + STP)

Steps to reproduce: 
  1. Visit any open pull request on GitHub
  2. Click on "files"
  3. Scroll until header snaps
  4. Either scroll up/down to see rendering defect or keep scrolling... it randomly occurs (see attached video).

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