WCAG 2.0 is a stable, referenceable technical standard. It has 12 guidelines that are organized under 4 principles: perceivable, operable, understandable, and robust. For each guideline, there are testable success criteria, which are at three levels: A, AA, and AAA.
For a short summary of the WCAG 2.0 guidelines, see WCAG 2.0 at a Glance.
To learn about web accessibility principles and guidelines, see Accessibility Principles.
The WCAG 2.0 supporting technical materials include:
- How to Meet WCAG 2.0: A customizable quick reference to Web Content Accessibility Guidelines 2.0 requirements (success criteria) and techniques is essentially the WCAG 2.0 checklist. Most people use this quick references as the main resource for working with WCAG.
- Techniques for WCAG 2.0 gives you specific details on how we can develop accessible Web content, such as HTML code examples. The techniques are "informative", that is, you do not have to use them. The basis for determining conformance to WCAG 2.0 is the success criteria from the WCAG 2.0 standard, not the techniques. Read more in Techniques in the FAQ.
- Understanding WCAG 2.0 has additional guidance on learning and implementing WCAG 2.0 for people who want to understand the guidelines and success criteria more thoroughly.
For more details on how these document are related and how they are linked, see The WCAG 2.0 Documents.
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