Thanks, yeah, there are lots of examples of standard HTML features that wouldn't make any sense in a true static document DSL like LaTeX, or a paper document.
I was just augmenting your answer as I liked it! It was also sort of a response to my sibling responder as they didn't seem to get what you were saying.
EDIT: Oh wait, maybe they did now that I re-read it... maybe? I think it's time for bed.
And of course <button type="submit">, <button type="reset">, annnnnd cough <a>.
There was <blink> and for some reason still <marquee> if you wanna consider animations dynamic.