How can I make a text pop up after a form is submitted

Answer 1

Learn Backend.
- NodeJs
- Php
- Python
- c/c++ ...etc cgi Quite a lot of options :)

Answer 2

You can for example change with javascript style of a pop up between none and block with the submitting of a form
modal.style.display = "block";
as in this example:

https://code.sololearn.com/WxbjPA3GaVuJ/?ref=app