Feature summary (what you would like to be able to do and where):
<section> elements generated by Parsoid should have aria-labelledby attribute, with the ID of the nearest heading as a value.
Benefits (why should this be implemented?):
<section> is assigned a "generic" ARIA role without this attribute, i.e. it's semantically meaningless; with the presence of this attribute, however, it's being assigned a "region" ARIA role, which is a landmark role and denotes "document areas the author deems significant", with all benefits of a landmark role (more semantics for the page, more navigation for screen reader users, ...).