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Citizens With Disabilities - Ontario


Web Content Accessibility Guidelines (WCAG) 2.0 latest draft

By Peter Abrahams (UK)
Wednesday, May 23, 2007
Peter Abrahams, Practice Leader, Accessibility and Usability, Bloor Research

On May 17th 2007 the latest Working Draft of the Web Content Accessibility Guidelines 2.0 (WCAG 2.0) was published. WCAG 2.0 will replace WCAG 1.0, which was published in 1999.

WCAG 1.0 was an amazing achievement in its day and has been a great assistance to all those concerned with accessibility. The plethora of new technology since 1999 means that some of the recommendations are now not relevant and many technologies are not covered at all. However the biggest problem with WCAG 1.0 to my mind is that it is difficult to understand for anyone coming new to accessibility. We could say that it is not accessible.

The new Guidelines are much more accessible, firstly because they have several introductory documents but mainly because the guidelines and success criteria are built around just four principles. These four principles lay the foundation necessary for anyone to access and use Web content. Anyone who wants to use the Web must have content that is:

Under each principle there is a list of guidelines that address the principle. There are a total of 12 guidelines:

That is all you need to understand about WCAG 2.0; the rest, as an ancient Rabbi said, is just commentary. Like any commentary it is vastly longer than the text.

Under each guideline there are more detailed descriptions and justifications of the guidelines; and for each guideline there are success criteria that describe specifically what must be achieved in order to conform to this standard. They are similar to the "checkpoints" in WCAG 1.0. Each success criterion is written as a statement that will be either true or false when specific Web content is tested against it.

All WCAG 2.0 success criteria are written to be testable. While some can be tested by computer programs, others require human testers for part or all of the test. The same results should be obtained with a high level of confidence when people who understand how people with different types of disabilities use the Web test the same content.

Each success criterion for a guideline has a link to the section of the Quick Reference document that provides:

This structure of: principles, guidelines, success criteria and techniques makes WCAG 2.0 much more readable and understandable.

The developers of the new version should be congratulated. The guidelines are still in draft but I do not think there will be substantive changes in the final version, just some further clarification and explanations. Anyone about to develop an accessible web site should definitely review these guidelines and incorporate them in the development plans.

See the Guidelines at

Taken from ccessibility_guidelin_.html.

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