preface context: I was recently asked to make a website for an event I participated in before

client: okay I heard you can make a website for our event? that’s great!
me (dev): yeah, do you have any requests or expectations for me?
.
client: not really, but I was a developer before and I can code a bit so I’m wondering in what language would you code or develop our website in?
me: oh I would be using JavaScript, specifically nodeJS
.
client: oh really? i’m not really familiar with that language, so is it okay if you code it in a language I understand and used before?
me: sure, what is it?
.
(lol I wonder if you can guess already what it is at this point)
client: HTML
me: ... (*uh oh* html isn’t a markup language *sigh*) :——)