#font-family-no-missing-generic-family-keyword

Disallow missing generic families in lists of font family names.

a { font-family: Arial, sans-serif; }
/**                     ↑
 * An example of generic family name */

This rule checks the font and font-family properties.

#Options

#true

The following patterns are considered violations:

a { font-family: Helvetica, Arial, Verdana, Tahoma; }
a { font: 1em/1.3 Times; }

The following patterns are not considered violations:

a { font-family: Helvetica, Arial, Verdana, Tahoma, sans-serif; }
a { font: 1em/1.3 Times, serif; }

It's also not a violation to use a keyword related to property inheritance or a system font value.

a { font: inherit; }
b { font: initial; }
i { font: unset; }
input { font: caption; }

It's also not a violation to use a generic font family anywhere in the list. In other words, the generic font name doesn't need to be the last.

a { font-family: Helvetica Neue, sans-serif, Apple Color Emoji; }