Over in  Steve proposes moving the UA requirements for accessibility mapping out of W3C HTML. The corresponding section in WHATWG HTML is .
Recently I tried to do implementer-ey things  but found the delineation between authoring and UA requirements in that section very confusing. So I am supportive of anything that clears that up. In the replies to both  and  Steve points out that the HTML -> ARIA mappings given in  are not a complete description of how UAs expose HTML elements to accessibility technologies, and that the document at  is more accurate. (For example, he notes that <figcaption> is exposed as a caption to certain accessibility technologies, but there is no way of expressing that in ARIA.) So in addition to being confusing, I am not sure the content at  actually has any normative value; at the very least it is incomplete. In the future I would like to work toward a system where HTML maps to ARIA, which maps to platform-specific accessibility stuff. So for example ARIA would grow to have a caption role, and <figcaption>'s accessibility aspects would be defined entirely by saying it has ARIA role caption. But apparently that is not the world we live in (yet?!), so I think  just confuses the issue by pretending that it is. In the meantime I think I agree with Steve that  seems to be a better place for implementers to consult. Thus I think we should remove all UA requirements from  and instead refer to  as the authoritative source for UA requirements for accessibility in HTML. I do not have a strong opinion on whether we should keep the authoring requirements of  intact or remove them as well. This is probably because I do not have a strong opinion about authoring requirements in general. What do you think? I could very well be missing something; this world of accessibility specs is pretty new to me... : http://lists.w3.org/Archives/Public/public-html/2014Sep/0000.html : http://www.whatwg.org/specs/web-apps/current-work/multipage/dom.html#wai-aria : http://lists.w3.org/Archives/Public/public-webapps/2014JulSep/0355.html : http://rawgit.com/w3c/aria/master/html-aam/html-aam.html