ROBN / Authen-U2F-0.003 / examples / demoserver / login.html.tt2 
<!DOCTYPE html>
<html>
<head>
   <title>U2F Demo</title>
</head>
<body>
  <form method='POST' action='/login'>
    <label for='username'>Username: </label><input id='username' name='username' type='text'><br>
    <label for='password'>Password: </label><input id='password' name='password' type='password'><br>
    <input type='submit'>
  </form>
</body>
</html>