[Webkit-unassigned] [Bug 206909] New: REGRESSION (r254406): Gmail.com star/favorite icons are not rendering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206909

            Bug ID: 206909
           Summary: REGRESSION (r254406): Gmail.com star/favorite icons
                    are not rendering
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

r254406 broke the icons in the "star" column in Gmail.

The ::before has:
content: -webkit-image-set('' 1x,'' 2x);

It seems this was previously invalid, so that content:'' was used. But now it's treated as valid, so we show the missing image icon.

I think we need to preserve the old behavior of image-set in -webkit-image-set.

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