I’d need some more help. I followed both the solutions given to create a “terms & agreement checkbox” popup and also the one to open an HTML document, but none of them is the solution I need. Actually the popup method would be good for the personal data treatment agreement, but the window that opens is not responsive and this is a problem.
1) How could I make it responsive? 2) Would it be possible to click on a similar link and open a .pdf file instead of the HTML one? This would be handy for I’d need my visitors to read a contract (and possibly save it) before accepting.