The U.S. Access Board is
an independent federal agency devoted to accessibility for people with disabilities. It operates with about
30 staff members and a governing board of representatives from Federal departments and public members appointed
by the President. In particular, take a look at their
“Electronic and Information Technology Accessibility Standards”
page.
WebAIM (Web Accessibility In Mind) has a
concise checklist of accessibility features required for
websites under Section 508 and Pass/Fail criteria.