Web Content Accessibility Guidelines (WCAG) from the W3C's Web Accessibility Initiative (WAI) helps Web designers and developers create sites that better meet the needs of people with disabilities or age-related limitations. WCAG advances accessibility across the full range of Web content (text, images, audio, and video) and Web applications. WCAG can be precisely tested, is easy to understand and use, and allows Web developers flexibility for innovation.

WCAG specifically addresses barriers to accessing the Web experienced by people with visual, auditory, physical, cognitive and neurological disabilities, and by older Web users with accessibility needs. WCAG 2.0 explains how to make content:

  • Perceivable (for instance by addressing text alternatives for images, captions for audio, adaptability of presentation, and color contrast);
  • Operable (by addressing keyboard access, color contrast, timing of input, seizure avoidance, and navigability);
  • Understandable (by addressing readability, predictability, and input assistance);
  • Robust (for instance by addressing compatibility with assistive technologies).

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