The Guidelines are based on four principles, from which a vast array of technical documents and specifications are derived. In the shortest form, all Web content should be perceivable, operable and understandable to everyone, and the content should be robust.
The table of contents for the Guidelines document also serves as a summary and brief explanation of the accessibility principles:
- 1 Perceivable
- 1.1 Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language.
- 1.2 Provide alternatives for time-based media.
- 1.3 Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
- 1.4 Make it easier for users to see and hear content including separating foreground from background.
- 2 Operable
- 3 Understandable
- 4 Robust
Some blog entries from participants in the process give a sense of the work that has been done since 1999, when the original Guidelines were published.:
A personal reflection on the WCAG 2.0 publication, by Shawn Lawton Henry (Web Accessibility Initiative Outreach Coordinator);
Thoughts from Matt May (from Adobe).
Direct links to the most important WCAG documents can be found on our Web Access Developments page.