A summary of the World Wide Web Consortiums' Web Content Accessibility Guidelines (WCAG) 2.0:

Perceivable

  • Provide text alternatives for non-text content.
  • Provide captions and other alternatives for multimedia.
  • Create content that can be presented in different ways, including by assistive technologies, without losing meaning.
  • Make it easier for users to see and hear content.

Operable

  • Make all functionality available from a keyboard.
  • Give users enough time to read and use content.
  • Do not use content that causes seizures.
  • Help users navigate and find content.

Understandable

  • Make text readable and understandable.
  • Make content appear and operate in predictable ways.
  • Help users avoid and correct mistakes.

Robust 

  • Maximize compatibility with current and future user tools.

For the full technical technical specifications, see Web Content Accessibility Guidelines 2.0 requirements and techniques.