Beware of broken box sizing
Require properties appropriate for display
Disallow duplicate properties
Disallow empty rules
Require use of known properties
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(New)
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
Disallow too many floats
Don't use too many font sizes
Disallow IDs in selectors
Disallow !important
Disallow outline:none
Disallow qualified headings
Heading should only be defined once

Check CSSLint for more details.

Global settings are overwritten by local .csslintrc files.