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Cascading Style Sheets Validators
CSS can be very tricky, especially with Cascading Style Sheets level 2 coming out. But these validators will help you verify that your CSS is correct and valid and will work.
Validate Your CSS
Use this form to validate your CSS against the W3C specification.
CSS Check
Use this validator from WDG to check the accuracy of your CSS.
CSS Validator
The W3C has created a downloadable CSS validator. It is in java, so will run on any machine with a Java Virtual Machine.
CSSCheckup
Upload a CSS file from your hard drive to be checked for accuracy and compliance with standards.