How to save a part of the HTML page with the entered data to the computer?

Question

PHP

Wrote a page where the user enters data. I want to make sure that when the button is clicked, a file with this form and the data that he entered is saved on his computer.
There was an idea to convert from html to pdf, but I could not figure out the scripts that I found.
Can someone tell me the already trodden path or algorithm of actions?
I will also make buttons "print" and "send by mail"

Answer 1

It is more correct to send data to the server, save it to the database, generate pdf (for example, in php) and download.

Answer 2

Having received the form on the server, we return the same html by filling in the fields. Before the output, insert After receiving this header, the browser will offer to save the page. header('Content-disposition: attachment');