tota11y

tota11y helps visualize how your site performs with assistive technologies.

tota11y is a single JavaScript file that inserts a small button in the bottom corner of your document.

The toolbar consists of several plugins that each provide their own functionality.

Many of these plugins "annotate" elements on the page. Sometimes to show their existence, other times to point out when something's wrong.

More information can be found here.

Video of the module in action here.