Web Content Accessibility Guidelines 1.0 W3C Recommendation 5-May-1999, contains 14 guidelines and 65 checkpoints:
- Provide equivalent alternatives to auditory and visual content.
- Don't rely on color alone.
- Use markup and style sheets and do so properly.
- Clarify natural language usage.
- Create tables that transform gracefully.
- Ensure that pages featuring new technologies transform gracefully.
- Ensure user control of time-sensitive content changes.
- Ensure direct accessibility of embedded user interfaces.
- Design for device-independence.
- Use interim solutions.
- Use W3C technologies and guidelines.
- Provide context and orientation information.
- Provide clear navigation mechanisms.
- Ensure that documents are clear and simple.
Important: WCAG 2.0 was published in December 2008, and is recommended over WCAG 1.0.
The Web Content Accessibility Guidelines 2.0 are organized into four general principles:
- Principle 1: Perceivable
- Information and user interface components must be presentable to users in ways they can perceive.
- Principle 2: Operable
- User interface components and navigation must be operable.
- Principle 3: Understandable
- Information and the operation of user interface must be understandable.
- Principle 4: Robust
- Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.