[Webkit-unassigned] [Bug 254204] New: Checking for nested CSS support with CSS.supports("selector(&)") doesn't work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254204

            Bug ID: 254204
           Summary: Checking for nested CSS support with
                    CSS.supports("selector(&)") doesn't work
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sam.willis at gmail.com

Checking for nested css support (#223497, #249263) via JavaScript using `CSS.supports("selector(&)")` doesn't work. I believe the expected behaviour is that it would return true in browsers that do support it (such as Safari Technology Preview), Chrome Canary does return true for this check.

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