[fstorr] This is one of these things where I read the specs for each element and then spend hours wondering if I’ve used the correct element. I’m certain that
<em>
isn’t correct. The
<i>
element could be a good choice, I think. The
<strong>
element (
https://www.w3.org/TR/html51/textlevel-semantics.html#the-strong-element) is interesting as the spec defines it for use in marking up "strong importance, seriousness, or urgency for its contents”. That said, Example 5 in the spec shows a
<figcaption>
element with
<strong>
used to (in my opinion) to make the text "Ant colony dynamics” stand out. It’s not clear to me how that text is strongly important, serious, or urgent. That example, I think, works with your question, but I’m not sure it’s the best choice. I think I’d go with
<i>
.