[Webkit-unassigned] [Bug 199237] New: Implement @supports selector().

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199237

            Bug ID: 199237
           Summary: Implement @supports selector().
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: emilio at crisal.io

This is a simple selector query function that allows to query whether an UA supports a selector, which .

Spec lives at https://drafts.csswg.org/css-conditional-4/#at-supports-ext.

It was discussed https://github.com/w3c/csswg-drafts/issues/3207.

I plan to enable it on Firefox on a couple releases, it'd be great if WebKit implemented this as well so authors can use it, and should be pretty straight-forward.

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