Accessibility Checker
The Accessibility Checker (called the 508c checker in versions 3.7
and below) checks and reports errors that, when resolved, result in
an enhanced accessibility for published content for the Web
Accessibility Initiative (WAI) Guidelines.
The accessibility checker, much like the spell checker and the
link checker, is invoked after a page edit is committed by clicking
the Submit button. If there are any elements that
the CMS deems suspect, the user is forwarded to a
Accessibility Checker page listing the errors
sorted by the field on the page in which they occur.
The checker will report on common errors such
as <table> elements without summary attributes as well
as <img> tags without alt
attributes among others. You can customize the accessibility
checking for your own specific needs as well.