2008 December 11th
W3C issued official recommendations for a second set of Web Content Accessibility Guidelines (WCAG 2.0). WCAG 2.0 is divided into 4 basic principles, according to which the content and web control features must be perceptible, operable, understandable and robust enough to work with today’s and future technologies. The basic principles of WCAG 2.0 consist of 12 general rules that are linked to the control criteria for which web content can be tested. There are three levels which refer to the extent to which the content satisfies the requirements: A (lowest), AA, AAA (highest).