I just want to ask, is there any other language i can use to add interactivity such as Pop-ups aside JavaScript

Answer 1

Web browsers can only handle javascript. But there are some transpilers which are able to make javascript from code written in another language, for example Brython or Transcrypt lets you write frontend code in Python.

https://code.sololearn.com/WgsPzmr3LWSf/?ref=app

Answer 2

Mirielle🐶
browser.alert(message)
a function that prints the message in a pop-up window. Returns None

https://brython.info/static_doc/en/browser.html