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+++ This bug was initially created as a clone of Bug #25003 +++ "h1 element heading role, with the aria-level property set to the element's outline depth If specified, role must be one of the following: heading, tab or presentation" http://www.w3.org/html/wg/drafts/html/master/dom.html#sec-implicit-aria-semantics the requirement to map heading levels to their outline depth has been around for years but no one has implemented, considering modifying requirements to align with all current implementations i.e. heading level = numerical value in heading element name.
In github: https://github.com/w3c/html/issues/169