Web Content Accessibility Guidelines
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Web Content Accessibility Guidelines (WCAG) are part of a series of Web accessibility guidelines published by the W3C's Web Accessibility Initiative. They consist of a set of guidelines on making content accessible, primarily for disabled users, but also for all user agents, including highly limited devices, such as mobile phones. The current version is 2.0.
The WCAG 1.0 were published and became a W3C recommendation on May 5, 1999. They have since been superseded by WCAG 2.0
WCAG 1.0 has three 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.
In February 2008, The WCAG Samurai, a group of developers independent of the W3C, and led by Joe Clark, published corrections for, and extensions to, the WCAG1.0.
WCAG 2.0 was published as a W3C Recommendation on December 11, 2008. The lengthy consultation process prior to this encouraged participation in editing (and responding to the hundreds of comments) by the Working Group, with diversity assured by inclusion of accessibility experts and members of the disability community.
The Web Accessibility Initiative is also working on guidance for migrating from WCAG 1.0 to WCAG 2.0. A comparison of WCAG 1.0 checkpoints and WCAG 2.0 success criteria is already available.
WCAG 2.0 uses the same three levels of conformance as WCAG 1.0, but has redefined them. The WCAG working group maintains an extensive list of web accessibility techniques and common failure cases for WCAG 2.0.
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