[Webkit-unassigned] [Bug 179007] New: Emoji does not display when using -apple-system in CSS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179007

            Bug ID: 179007
           Summary: Emoji does not display when using -apple-system in CSS
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matt.sephton at gmail.com
                CC: mmaxfield at apple.com

Created attachment 325347

  --> https://bugs.webkit.org/attachment.cgi?id=325347&action=review

screenshot of the emoji appearing/not in inspector/document

http://www.halfapp.co uses the 💯 emoji.

In Safari on macOS I see a question mark in a square. See screenshot.  
I also have this issue in emoji used on my Instagram profile.  

Also, in the web inspector, I see the emoji.  
And if I use Look Up, the emoji is shown.  
Logging in as a guest user I see the emoji.  

No duplicate fonts, no fonts with errors or corruption.  
Apple Color Emoji is where it should be.  

And the emoji is displaying just fine in this post!

Permissions have been repaired and re-checked, but I can check something specific if that would help.

If I remove "-apple-system" from the CSS font definition the emoji appear (and of course the font changes).

Any ideas?

macOS 10.13, Safari 11.0 (13604.1.38.1.6)


Also see: <rdar://problem/35048088>

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