Can I use <h3>
element nested inside <dt>
element in order to make logical outline in this code
<aside>
<dl>
<dt><h3>Still have questions?</h3> Contact us at</dt>
<dd>hello@hardwarehackathon.com</dd>
</dl>
</aside>
otherwise, it's showing "untitled ASIDE" in the document outline
Still have questions?
Contact us at` is certainly not a _term_ that would deserve or need a _definition_. Your "compromise" is certainly better IMHO, because it doesn't (ab-)use a definition list for content that clearly has no place being in one. I would put "Contact us at" at the beginning of the paragraph though, not at the end of the headline. – CBroe Feb 03 '18 at 08:16