Making Web Content Accessible

Posted by editor on May 26, 2008

In an effort to make web content accessible for everyone who wishes to access the Web, including disabled users and user agents like the Session Initiation Protocol (SIP) used for mobile phones, the W3C’s Web Accessibility Initiative had released Web accessibility guidelines called the Web Content Accessibility Guidelines (WCAG). The guidelines have 3 priority levels:

Priority 1: Web developers must satisfy these requirements, otherwise it will be impossible for one or more groups to access the Web content. Conformance to this level is described as “A”.
Priority 2: Web developers should satisfy these requirements, otherwise some groups will find it difficult to access the Web content. Conformance to this level is described as “AA” or “double A”.
Priority 3: Web developers may satisfy these requirements, in order to make it easier for some groups to access the Web content. Conformance to this level is described as “AAA” or “triple A”.

Source:
http://en.wikipedia.org/wiki/Web_Content_Accessibility_Guidelines