IBM's Accessibilty heuristic: http://www-03.ibm.com/able/guidelines/web/accessweb.html
List provided by Paddison, C and Englefield, P article
1. Provide meaningful and relevant alternatives to non-text elements
- Images, graphs, video, sound, image maps, objects (applets, plug-ins, PDF files)
- If important information is being conveyed, provide a suitable alternative
- Alternatives provide all users with the same relevant content
2. Support consistent and correctly tagged navigation
- Always provide a home page link
- Always provide a skip to main content link
- Correctly tag headings
- Meaningfully title frames
- Correctly tag table headers
3. Allow complete and efficient keyboard usage
- Allows users to navigate by keyboard alone
4. Respect users' browser settings
- Permit large font sizes
- Ensure page layout adjusts itself to suit font size
- Allow preferred colour settings
5. Ensure appropriate use of standard and proprietary controls
- Text entry fields, drop-down menus, radio buttons, checkboxes, buttons
- Ensure controls do not stop the completion of the task
6. Do not rely on colour alone to code and distinguish
- Verify colour alone is not used for information
- Ensure contrast is sufficient in images
7. Allow users control of potential distractions
- Provide a means to stop blinking, flashing, flickering
- Allow users to control speed of scrolling e.g. ticker tape
8. Allow users to understand and control time restraints
- Notify user of time-out
- Allow users to request more time
9. Make certain the Web site is content compatible with assistive technologies
- Make certain important and frequent tasks can be completed successfully using assistive technology tools e.g. screen reader, magnifier