There are two main sources of accessibility guidelines on the Internet: Web Accessibility Initiative (WAI) guidelines and, in the United States, Section 508 of the Rehabilitation Act.
The canonical source for accessibility guidelines is produced by the World Wide Web Consortium (W3C). The latest version of the recommendations at the time this book was written was the Web Content Accessibility Guidelines (WCAG) 2.0. It is available at www.w3.org/TR/WCAG20/. The guidelines in the WCAG address the four principles of accessibility.
• Can the information be easily perceived (or “seen”)?
• Can the software (Web site) be easily operated (or “navigated”)?
• Is it easy ...