XHTML-CSS Validator is a website that helps you check the markup and style validity of web pages. It does this by submiting the URLs that you want to check to the W3C Markup and the W3C CSS Validators.
These validators send back validations results in SOAP format, which this website internaly consumes in order to produce the result you’re seeing.
With some interesting advanced features, this validator is a must for every designer.
thanks for the new link of css validator. I Ussualy use W3C CSS .