ARIA in HTML, by @scottohara and @patrick_h_lauke (@w3c):
www.w3.orgARIA in HTMLThis specification defines the authoring rules (author conformance requirements) for the use
of Accessible Rich Internet Applications (WAI-ARIA) 1.2 and Digital Publishing WAI-ARIA Module 1.0 attributes on [HTML] elements.
This specification's primary objective is to define requirements for use
with conformance checking tools used by authors (i.e., web developers). These requirements will aid authors
in their development of web content, including custom interfaces and widgets, which make use of ARIA to
complement or extend the features of the host language [HTML].
Should the ARIA WG standardize heuristic-based ignoring of ARIA and related features? And if so, how? - 
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aria-labelledby usage notes