Section 508 and WCAG

Following are the two primary web accessibility standards:

Section 508

Section 508 In 1973 the United States government passed the Rehabilitation Act. Part of this Act is Section 508, which was amended in 1998 and requires Federal agencies to follow standards in developing, maintaining, acquiring, or using electronic and information technology to make systems accessible to people with disabilities.

See https://www.section508.gov.

Web Content Accessibility Guidelines (WCAG)

Web Content Accessibility Guidelines (WCAG) These guidelines are created by the Web Accessibility Initiative (WAI), as part of the World Wide Web Consortium (W3C), in an effort to make the web accessible to people with disabilities.

See http://www.w3.org/WAI/intro/wcag.php.