WCAG = Web Content Accessibility Guidelines, an international standard created by W3C.
Some requirements include:
- Proper text alternatives (alt text)
- Keyboard navigability
- Sufficient colour contrast
- Resizable text
- Proper headings & structure
- Accessible forms & error messages
- No content that triggers seizures
- Captions for prerecorded videos
- Logical reading and tab order
- Cancel/undo actions where possible
- No time limits without warning