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Free CSS Validators

W3C CSS Validation Service
A free service that checks Cascading Style Sheets (CSS) in (X)HTML documents or standalone for conformance to W3C recommendations. You can validate by entering a URI or by uploading a document.

CSSCheck
Enter the URL of a Cascading Style Sheet, or enter your style sheet directly in a text area. There is also a link to a tool that will check your uploaded style sheet.