This means that
instead of a bunch of HTML code samples (the dominant technology in the late 1990s), the
theories and recommendations apply to all technologies, from SVG to Flash to Portable
Document Format (PDF). Instead of 14 general guidelines, WCAG 2.0 has been distilled
into four major pillars:
Perceivable: This ensures that content can be perceived by users with at least one
sense??”usually vision or hearing.
Operable: The content must be delivered in a way that users can operate it using
standard technology.
Understandable: This one??™s a bit fuzzier, but the content must be presented in a
way that??™s understandable.
Robust: Interfaces and hardware for disseminating the content must be robust
enough to handle disability access.
Within those four, three levels of success criteria replace WCAG 1.0??™s priority levels. In
terms of writing accessible websites, the same fundamental concepts apply to both versions
of the WCAG, such as images and multimedia requiring text alternatives, form elements
needing labels, and content and background having at least a five-to-one contrast
differential. On a technological and tactical level, there is little difference.
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