The AInspector tool is a sidebar on Firefox that provides a summary of violations divided by WCAG rule category. It also maps the violated WCAG guideline with information about why/how it is violating the rule. Users can drill down further by selecting the element and displaying the related HTML code in the bottom part of the screen. AInspector was developed at University of Illinois.
[Screencapture from AInspector Sidebar with Evaluation of a Library's Website.]
Provide automated detection of accessibility issues
Reveal what a screen reader should say for interactive elements (the accessible name computation)
Give practical suggestions to improve accessibility and check 508 compliance