The WCAG (Web Content Accessibility Guidelines) were made to establish a single shared standard for the accessibility of web content that is applied to governments, organizations, and individuals around the world.

The four basic guidelines are:

  • Perceivable: Information and user interface components must be presentable to users in ways they can perceive.
  • Operable: Users must be able to operate the interface components and navigation.
  • Understandable: Information and the operation of the user interface must be understandable.
  • Robust: Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies, and must remain current as technologies evolve.