One of the most frustrating yet fascinating challenges to achieving an optimally accessible Web is trying to complete a perfect circle. Three parts of that circle are covered by the W3C Web Accessibility Initiative’s triumvirate of guidelines: conformant content (WCAG), created by conformant authoring tools (ATAG), and accessed using conformant user agents (UAAG). This approach has some practical flaws – not least in that there’s a missing part of the circle: conformant users.

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