Web Content Accessibility Guidelines based on the World Wide Web Consortium Recommendations

Guideline 1. Provide equivalent alternatives to auditory and visual content.

Guideline 2. Don't rely on color alone.

Checkpoints:
2.1 Ensure that all information conveyed with color is also available without color, for example from context or markup.

2.2 Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits or when viewed on a black and white screen.

Guideline 3. Use markup and style sheets and do so properly.

Guideline 4. Clarify natural language usage

Checkpoints:
4.1 Clearly identify changes in the natural language of a document's text and any text equivalents (e.g., captions).

4.2 Specify the expansion of each abbreviation or acronym in a document where it first occurs.

4.3 Identify the primary natural language of a document. 

Guideline 5. Create tables that transform gracefully.

Guideline 6. Ensure that pages featuring new technologies transform gracefully.

Guideline 7. Ensure user control of time-sensitive content changes.

Guideline 8. Ensure direct accessibility of embedded user interfaces.

Guideline 9. Design for device-independence.

Guideline 10. Use interim solutions.

Guideline 11. Use W3C technologies and guidelines.

Guideline 12. Provide context and orientation information.

Guideline 13. Provide clear navigation mechanisms.

Guideline 14. Ensure that documents are clear and simple.

Checkpoints:
14.1 Use the clearest and simplest language appropriate for a site's content.

14.2 Supplement text with graphic or auditory presentations where they will facilitate comprehension of the page.

14.3 Create a style of presentation that is consistent across pages.