Unknown font family not recognized

[keithjgrant]

Syntax highlighting is only provided for known font families. Given font-family: Raleway, Helvetica, Alfa Slab One, sans-serif;, only "Helvetica" and "sans-serif" are highlighted.

[keithjgrant]

Note: quoted font families work, and are highlighted as strings. But the spec does not require them to be quoted unless they contain certain special characters.