<!DOCTYPE html> <html> <head> <title>Page Title</title> <script type="text/javascript" src="/file.js"></script> </head> <body> <input id="keyhash" placeholder="Paste the key your friend sent you."/><br /> <input id="salt" placeholder="Paste the salt your friend sent you."/><br /> <button onclick="download()">DOWNLOAD</button> </body> </html>