The Drupal community has adopted an Accessibility Statement that sets goals for both the software we produce as well as websites managed by the Drupal Association. Although there are a lot of standards, the most widely adopted internationally is the World Wide Web Consortium's (W3C) Web Content Accessibility Guidelines (WCAG) 2.0 AA.

These guidelines provide many best practices for eliminating barriers for participation on websites. Since the drupal.org site has moved to Drupal 7, many accessibility problems have been resolved because because Drupal Core has resolved many problems in the API.

Common problems include:

The WAVE Toolbar is a simple add-on, but there are a bunch of tools which can help test for accessibility.

We try to follow WCAG 2.0 AA because it means that our community can support as wide a range of designers, developers & documentation people as possible. If there are problems with the accessibility of the current site, please post an issue to the Drupal.org customizations issue queue and tag it "accessibility".