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lang-html
<h#>elements were designed from day one.<dialog>element, b) having its own outline still does not matter since no browser supports the outline algorithm and it has been noted in HTML5 and HTML5.1 that it should be avoided and c) the W3C link you offer even says "Authors should use headings of the appropriate rank for the section’s nesting level."role=dialogis not equivalent to<dialog>. Adding arolenever makes it equivalent, whether for the browser or assistive technology, it just exposes some of its aspects (which is why you still have to script keyboard support forrole=button). b) Semantics are different from structure.<h#>imparts both,<strong>imparts only semantics. Technology support is important for AT, so yeah, we are talking about that. c) You are unclear. Regardless, it is still not semantically correct.