The Web Content Accessibility Guidelines (WCAG) are organized around four principles. Anyone who wants to use the Web must have content that is:
- Perceivable Information and user interface components must be presentable to users in ways users can perceive.
- Operable The user interface cannot require interaction that a user cannot perform.
- Understandable Users must be able to understand the content as well as how to interact with the user interface.
- Robust Content must be able to be interpreted reliably by a wide variety of assistive technologies (e.g. screen readers) and the content should remain accessible as these technologies evolve.
Following these principles will affect the way you design and build your web application and enhance the experience for all users.
Failing to consider any of these principles puts a barrier between your application and your users.