2.2.13 [CSS-Level2-2009] Section 15.3, Font family: the 'font-family' property

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V0253:

The specification states:

 Font family names that happen to be the same as a 
 keyword value ('inherit', 'serif', 'sans-serif', 'monospace', 'fantasy', and 
 'cursive') must be quoted to prevent confusion with the keywords with the same 
 names. The keywords 'initial' and 'default' are reserved for future use and must 
 also be quoted when used as font names. UAs must not consider these keywords as 
 matching the '<family-name>' type.

Quirks Mode and IE7 Mode (All Versions)

White space characters before and after the font name are not ignored. In addition, any extra white spaces are not consolidated inside the font name. Therefore, the rule fails to parse and the font is not properly loaded.