Making sure your website is totally standards compliant has always been a tricky game.
It’s even more so difficult when you’re designing a website that requires ADA (Americans With Disabilities act) compliance. Luckily, this time-tested dilemna has met it’s match : the ADA Accessibility Validator (about.com) . About.com also offers a variety of other validators to make sure your code is 100% compliant – including the Section 508 standards, W3C, Valid HTML, Valid XHTML, and more. See the whole range of validation tests at their site (about.com)