TFA is old enough that the "HTML5" here means "as opposed to Flash".
the only downside to flash going away was zombo.com no longer works correctly.
You scared me for a sec. Life is dull without that site. I did check right away and it does work. Phew ;)
RIP autoplay...
Then it'd be DHTML
Newp. DHTML as a term is way older, and referred to earlier things.
Browser audio support came about with HTML5, the js APIs used for this sort of thing were to support the <audio/>
It's an okay catch-all term for "browser technology from after 2010" I suppose, like how DHTML was a catch-all for HTML + JS and AJAX for fetching things from JS.