(2014 updated 2021) the original OpenBSD article is (2017) and there's still no good canonical DL instantiation -commonmark goes into "do it in HTML" which is .. FAIL in my book.

So, a "standard" which has been continuously revised since 2014 and doesn't have definition lists except as "use HTML"

That was the best attempt to update it and improve upon it.

Its mostly successful, but not entirely. Wish Gruber would just link to that instead of his old, bugger, out of date spec.