ROBN / Authen-U2F-0.003 / examples / demoserver / index.html.tt2 
<!DOCTYPE html>
<html>
<head>
   <title>U2F Demo</title>
</head>
<body>
[% IF username %]
  <p>G'day [% username %]</p>
  [% IF registered_keys.keys %]
  <p>registered key handles:</p>
  <ul>
    [% FOR handle IN registered_keys.keys %]
    <li>[% handle %]</li>
    [% END %]
  </ul>
  [% END %]
  <a href='/register'>Register U2F device</a>
  <a href='/logout'>Logout</a>
[% ELSE %]
  <a href='/signup'>Signup</a>
  <a href='/login'>Login</a>
[% END %]
</body>
</html>