Two primary sets of guidelines exist for checking that a site is accessible to persons with disabilities.
Web Content Accessibility Guidelines
The World Wide Web Consortium's (W3C) Web Accessibility Initiative released a set of checkpoints for accessibility, organized into three priority groups. Priority one represents a set of guidelines the designer must follow for the document to be considered accessible, as they cover key concepts that, if not achieved, will make it impossible for the disabled to effectively use a site; priority two contains checkpoints that should be followed as they cover significant barriers to accessibility; and priority three is a set ...
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