Developed by World Wide Web Consortium (W3C) Web Accessibility 
  Initiative (WAI):
  - Authoring Tool Accessibility Guidelines (ATAG) 
    addresses authoring tools
 
  - Web Content Accessibility Guidelines (WCAG) 
    addresses Web content, used by content developers, authoring tools, accessibility 
    evaluation tools
 
  - User Agent Accessibility Guidelines (UAAG) 
    addresses Web browsers and media players, including some aspects of assistive 
    technologies
 
  - Based on the fundamental technical specifications Web, in coordination with 
    W3C technical specifications (HTML, XML, CSS, SVG, SMIL, 
    etc.)