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CSS Validator

You can use this tool to validate css code and find errors and warnings that can be fixed. Customize your css validation from the options.

Errors

>/Beware of broken box sizing
>/Require properties appropriate fordisplay
>/Disallow duplicate properties
>/Disallow empty rules
>/Require use of known properties

Compatibility

>/Disallow adjoining classes
>/Disallowbox-sizing
>/Require compatible vendor prefixes
>/Require all gradient definitions
>/Disallow negativetext-indent
>/Require standard property with vendor prefix
>/Require fallback colors
>/Disallow star hack
>/Disallow underscore hack
>/Bullet-proof @font-face

Performance

>/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

Maintainability Duplication

>/Disallow too many floats
>/Don't use too many font sizes
Disallow IDs in selectors
>/Disallow!important

Accessibility

Disallowoutline:none

OOCSS

>/Disallow qualified headings
>/Heading should only be defined once

Learn More About the Rules

	Line	Col	Title	Description	Browser
No syntax errors!

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