[Webkit-unassigned] [Bug 246742] New: 'auto' keyword parsing support for font descriptors inside @font-face rule

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246742

            Bug ID: 246742
           Summary: 'auto' keyword parsing support for font descriptors
                    inside @font-face rule
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: moonira at google.com

Created attachment 463083

  --> https://bugs.webkit.org/attachment.cgi?id=463083&action=review

'auto' keyword parsing in font descriptors inside @font-face rule

According to spec https://www.w3.org/TR/css-fonts-4/#font-prop-desc the 'auto' keyword for 'font-weight', 'font-style' and 'font-stretch' descriptors inside @fotn-face rule should be supported, Safari however does not support parsing of 'auto' keyword. 

So in the attached html file, the expected result is that you should see "Font weight range: auto" in the browser, however in Safari it is "Font weight range:".

Corresponding WPT tests *'auto' keyword inside @font-face: auto* in https://wpt.fyi/results/css/css-fonts/variations/at-font-face-descriptors.html?label=experimental&label=master&aligned are also not passing in Safari.

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