[Webkit-unassigned] [Bug 227705] New: Missing or Flickering Elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227705

            Bug ID: 227705
           Summary: Missing or Flickering Elements
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kerryliu at gmail.com
                CC: simon.fraser at apple.com

Created attachment 432933

  --> https://bugs.webkit.org/attachment.cgi?id=432933&action=review

Test case for flickering text

In the WordPress Block Editor, we were seeing elements flicker in Safari and the Safari Technology preview 127 in https://github.com/WordPress/gutenberg/issues/30803.

I've narrowed this down to a test case, which I've attached. It's also available at https://codepen.io/gwwar/pen/dyWYdmg

It should look like https://user-images.githubusercontent.com/1270189/124388676-c0a34f80-dc98-11eb-8987-aa0e6001c10c.mp4 with the bad behavior.

It's a little bit of a complex setup, requiring flex styles, an iframe, two fixed divs, and some z-index stacking contexts. We're are able to consistently reproduce this, so I do feel it's worthwhile to report. Let us know if folks have trouble reproducing or if y'all need more information. Thanks!

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