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Which rules to follow to implement web accessibility. The four principles that provide the foundation for web accessibility are ‘perceivable’, ‘operable’, ‘understandable’, and ‘robust’. To learn more about them and about WCAG (Web Content Accessibility Guidelines) , the full documentation is available from W3C ( ). WCAG 2.0 and 2.1 use uses levels to define each criterion, and they are A, AA, and AAA. The following list tries to summarize the most important ones of AA and AAA level. Another useful specification to keep in mind is the WAI-ARIA (Accessible Rich Internet Applications) that shows how to increase the accessibility of dynamic content and user interface components developed in Ajax, HTML, JavaScript and related technologies. WAI-ARIA also allows the developer to provide all the semantics to fully describe the supported behavior, to expose the elements current states and properties and their relationships to other elements.

DSpace strives to align with all WCAG 2.1 AA criteria. Some AAA criteria may also be supported.  (Keep in mind that DSpace can only "align" with WCAG, as AA or AAA criteria also includes criteria for files uploaded into DSpace, e.g. captions/descriptions on audio/video, and DSpace cannot control what files are uploaded.)

Here the guidelines to follow: