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Free Online Tools For Developers
Home
Code Editor Tester
CSS Validator
CSS Validator
Validate
Format
Clear
Errors
Require properties appropriate for
display
Beware of broken box sizing
Disallow empty rules
Disallow duplicate properties
Require use of known properties
Compatibility
Disallow
box-sizing
Disallow adjoining classes
Require all gradient definitions
Require compatible vendor prefixes
Require standard property with vendor prefix
Disallow negative
text-indent
Disallow star hack
Require fallback colors
Bullet-proof @font-face
Disallow underscore hack
Performance
Disallow
@import
Don't use too many web fonts
Disallow selectors that look like regexs
Disallow duplicate background images
Disallow unqualified attribute selectors
Disallow universal selector
Disallow overqualified elements
Disallow units for 0 values
Require shorthand properties
Maintainability & Duplication
Don't use too many font sizes
Disallow too many floats
Disallow
!important
Disallow IDs in selectors
Accessibility
Disallow
outline:none
OOCSS
Heading should only be defined once
Disallow qualified headings
Learn More About the Rules
Line
Col
Title
Description
Browser
No syntax errors!
Code Editor Tester
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› Online Code Editor