section 3.2.7 WAI-ARIA http://www.w3.org/html/wg/drafts/html/master/dom.html#wai-aria does not include clear advice for authors on which ARIA roles,states and properties can be used on any given HTML element. Using ARIA in HTML does https://dvcs.w3.org/hg/aria-unofficial/raw-file/tip/index.html suggest adding a refernce to it in section 3.2.7 WAI-ARIA and also providing clear reference to WAI-ARIA authroing practices spec as an aid to authors.
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Change Description: added note with references https://github.com/w3c/html/commit/38ffe22ebc22e1a0f8e6e0788fe426e402df1fc8
Rationale: The primary audience of this section is implementers it does not provide clear or adequate info for authors, other W3C documents do.
note the correct link to the decision policy is http://dev.w3.org/html5/decision-policy/decision-policy-v3.html