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WCAG

Guidelines for Accessible Web Content (WCAG [WCAG]) is one of the fruits produced by the Web Accessibility Initiative (WAI [wai]), founded by an international consortium W3C [W3C].
recognized and adopted as a reference internationally by many nations,
WCAG guidelines serve as a support to create accessible content, not only for users with disabilities, but also for network access devices with limited functionality, such as mobile phones.

The first version of this document [wcag1.0] was published in 1999 and is still the reference document recommended by the W3C.
The requirements in WCAG 1.0 are divided into three groups according to levels of priority:

• Group 1: Developers of content for the Web must meet these requirements, it is impossible to access these contents by one or more groups. Compliance with these requirements is called the level "A".
• Group 2: Developers should meet the requirements of this group to avoid difficulties of access to certain categories of users. Web content developed according to these requirements is that the level of "AA".
• Group 3: Web developers could meet these requirements for greater ease of access for some users. Compliance with these requirements is described as the level "AAA".

The main limitations shown by the WCAG 1.0 arise in applying these criteria to the new technologies of the Web As one example, sites developed Flash or AJAX, the concept of "web page", used in WCAG 1.0, it becomes obsolete, since these technologies are based mostly in the changing of parts or units of information contained in the "pages". Nor, in the case of sites developed entirely in Flash, it is possible to speak of compliance with HTML, since Flash content is not based on HTML, and the latter was often only a function of "container" of Flash objects.

For these reasons and more, in 2001 published the first draft of what will soon become the final version of WCAG 2.0. In this version there is an attempt to separate the accessibility criteria of what may to be their application in practice, with the intention of being able to make these criteria applicable to the technologies available today, but also to those to be developed in the future.
However, the WCAG 2.0 has received heavy criticism of the excessive abstraction of the concepts, which makes them impossible to apply, and also to have deliberately left out some basic concepts held only because you can not test them with automated methods [WCAGsamurai].