Does someone know how to make a working navigation bar that shows/hides certain elements of the webpage?

Question

more specifically I'm trying to make it work using the single HTML file we have in the coding playground.
edit: I have found stuff that works for 2 pages but I'm looking for something that works with more than that.

Answer 1

do you mean something like this?
https://code.sololearn.com/WwO3eo2duzT1/?ref=app
or just certain things?

(i know the code is inefficient and theres not really any content but its hard to type on a phone)

Answer 2

yes that's exactly what I meant, thank you so much! :)