[Webkit-unassigned] [Bug 199258] New: Some elements disappear when fullscreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199258

            Bug ID: 199258
           Summary: Some elements disappear when fullscreen
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xidorn-webkit at upsuper.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 373001

  --> https://bugs.webkit.org/attachment.cgi?id=373001&action=review

testcase

Steps to reproduce:
1. extract the test case attached
2. use a web server to serve it, e.g. python3 -mhttp.server
3. open the page in browser via the server
4. click the fullscreen button on the bottom of the page
(you may not see the button at its initial load, but a further reload should get it right)

Expected result:
the result shows as is

Actual result:
the dot before "TITLE 3" disappears


This seems to be related to the two <canvas> elements on the page. If I remove both then the dot appears again.

This issue happens on Chrome as well, and I've filed: https://bugs.chromium.org/p/chromium/issues/detail?id=979103

Sorry about the large testcase. I haven't figured out a way to reduce it properly.

This can also reproduce on our product website directly: https://www.canva.com/design/DADd7-c0PH4/iKHgh3or0fXnqueYWPj2Gg/view?utm_content=DADd7-c0PH4&utm_campaign=designshare&utm_medium=link&utm_source=sharebutton (although we may try fixing it from our side as well, so it may no longer reproducible there after several weeks).

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