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"3.2.7 WAI-ARIA" http://www.w3.org/html/wg/drafts/html/master/dom.html#wai-aria consider pointing to API guide for mappings as that is where the useful information/specification on the various acc api's lives http://rawgithub.com/w3c/html-api-map/master/index.html
see http://www.w3.org/TR/html51/dom.html#user-agent-requirements