Current Browsers and the User Agent Accessibility Guidelines 1.0
http://www.webstandards.org/learn/articles/current-browsers-uaag10/

Lauke, Patrick H.
Web Standards Project
2009

Abstract:

Any effort on the part of web authors to add accessibility features is rendered useless if browsers and assistive technologies don’t take advantage of them. User agent developers need to ensure that their products support these features and, most crucially, make them available to users in an accessible and obvious manner. What follows is a quick run-down of most of UAAG’s guidelines and checkpoints, annotated with comments, suggestions, personal gripes about current levels of implementation, and wishlists for future browser versions.