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The 4 principle of Web Accessibility in WCAG 2.0 are:
Principle | Indicator | Disability Category |
Perceivable | images need text alternatives | visual |
contrast ratio | visual | |
captions for audio | hearing | |
content flicker | visual, cognitive | |
Operable | ||
keyboard access to all functions | physical | |
user control for timed responses | physical, cognitive | |
heading structure for navigation & content retrieval | physical, visual | |
Understandable | ||
Language ID | visual, cognitive | |
Content, system operates predicatably | cognitive | |
Input errors can be avoided or corrected | physical, cognitive | |
visual clarity, readability | visual, cognitive | |
Robust | ||
Content Delivery is independent of single technology | all disabilities | |
assistive technology compatible | all disabilities |
There is a good checklist for web accessibility available on the WebAIM website - http://www.webaim.org/standards/508/checklist