You can pick and choose which errors and warnings to test for below. (All) | (None)

Errors (All) | (None) Beware of broken box sizing

Require properties appropriate for display

Disallow duplicate properties

Disallow empty rules

Require use of known properties Compatibility (All) | (None) Disallow adjoining classes

Disallow box-sizing

Require compatible vendor prefixes

Require all gradient definitions

Disallow negative text-indent

Require standard property with vendor prefix

Require fallback colors

Disallow star hack

Disallow underscore hack

Bullet-proof @font-face Performance (All) | (None) Don't use too many web fonts

Disallow @import

Disallow duplicate background images

Disallow selectors that look like regexs

Disallow universal selector

Disallow unqualified attribute selectors

Disallow units for 0 values

Disallow overqualified elements

Require shorthand properties