Web Accessibility:Validation Tools
Pages must be evaluated using different techniques. Good accessibility checks require both human judgement necessitating manual checking and code validation. Code validators cannot determine the accessibility of web sites, they can only assist in accessibility checking.
Validation tools validate the code on the page against user selected criteria. Section 508 or W3C Web Accessibility (WCAG) Standards. They range from browser-based toolbars that testa page and visually display identified issues and errors; desktop applications that monitor, evaluate and help retrofit web pages; and server-based tools that spider web sites and generate accessibility compliance reports.