title: How to implement login popup in html/javascript
body: <p>Basically, I want to create a login popup like the one that a lot of routers have to get access to the setup page:
  <img src="https://i.stack.imgur.com/Ms3LL.png" alt="Login popup"></p>
  
  <p>is it possible to implement this on an html file at all or is it only for server based access?</p>