Web Content Accessibility Guidelines
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 for 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.
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[edit] WCAG 1.0
The WCAG 1.0 were published and became a W3C recommendation on 5 May 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 They have since been superseded by WCAG 2.0.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.
[edit] WCAG Samurai
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 WCAG 1.0.
[edit] WCAG 2.0
WCAG 2.0 was published as a W3C Recommendation on 11 December 2008.[1][2] 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.[3]
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.[4]
[edit] Earlier Guidelines
The first the first Web Accessibility Guidelines titled, "Design of HTML (Mosaic) Pages to Increase their Accessibility to Users with Disabilities; Strategies for Today and Tomorrow" were compiled by Gregg Vanderheiden and released in January of 1995 just after the 1994 WWW II in Chicago (where Tim Berners-Lee first mentioned disability access in a keynote speech after seeing a pre-conference workshop on accessibility led by Mike Paciello).
Over 38 different Web Access guidelines followed from various authors and organizations over the next few years. These were brought together in the Unified Web Site Accessibility Guidelines compiled by the Trace R&D Center at the University of Wisconsin-Madison. Version 8 of the Unified Web Site Accessibility Guidelines, published in 1998, was used as the starting point for the W3C's WCAG 1.0.
[edit] References
[edit] External links
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