Checklists for accessibility testing overall

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Related issue on GitHub #170 Checklists for accessibility testing overall.
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Accessibility testing guide by the British Government Digital Service. For testing websites and applications against the Web Content Accessibility Guidelines (WCAG) 2.2 AA Level. A detailed checklist per WCAG Success criterion.

Check your WCAG compliance by the A11y Project. The checks are ordered by topic.

WebAIM’s WCAG 2 Checklist, a checklist that presents recommendations for implementing the most common accessibility principles and techniques for those seeking WCAG conformance.