Is there a tool that validates Contribute CS4 content automatically?
No. Contribute CS4 does not include a built-in content accessibility validation tool. However, Dreamweaver CS4 does have such a tool, which your web administrator or designer can easily access for you. The Dreamweaver CS4 validation report feature allows you to validate web pages for compliance with Section 508 standards and World Wide Web Consortium (W3C) Web Content Accessibility Guidelines Priority 1 checkpoints. It identifies all areas with obvious errors, such as missing ALT text, as well as areas that require a manual evaluation, such as color combinations. Dreamweaver CS4 also includes a built-in accessibility reference that explains each of the rules used to check pages for accessibility issues and includes links to more detailed information about each issue, making it easier for you to master accessibility issues relevant to your site.