The Web Content Accessibility Guidelines (WCAG) are used widely around the world as a benchmark for web accessibility.
WCAG has four main principles:
- Perceivable – Information and user interface components must be presentable to users in ways they can perceive.
- Operable – User interface components and navigation must be operable.
- Understandable – Information and the operation of user interface must be understandable.
- Robust – Content must be robust enough that it can be interpreted reliably by a wide variety of user agents.