2.1.93 [CSS-Level2-2009] Section 15.7, Font size: the 'font-size' property

V0146:

The specification states:

 ‘font-size'
  
 Value:                 <absolute-size> | <relative-size> | <length> | <percentage> 
 | inherit 
 Initial:               medium
 Applies to:            all elements
 Inherited:             yes
 Percentages:           refer to inheritedfont size
 Media:                 visual
 Computed value:        absolute length

Quirks Mode and IE7 Mode (All Versions)

The inherit value of the font-size property is not supported.

V0147:

The specification states:

 Negative values are not allowed.

Quirks Mode (All Versions)

Negative font-size values are interpreted as small.