I found a question (screenshot here) where the user placed some subscript characters both in title and body.
The weird thing is the title displays them correctly, but the body won't, so I changed them to
<sub>1</sub> and so on.
Now I'm wondering: is it possible to use the allowed HTML tags in the title, or not? (I don't want to try doing it as I fear to mess it up, and I don't have editing privilege so test edits will waste someone's time.)