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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