The latest development code for the CSS Validator is available through the GitHub repository.
For a visual representation, see the CSS Validator Sequence Diagram, which is available in png, graffle and svg formats.
If you have any questions or problems with the validator, send us an email.
Download and compilation of the software do not give the right to use the W3C logo on the service. The use of the W3C logo on your site requires prior approval from the W3C Team (site-policy@w3.org)