demo.html

<!DOCTYPE html>
<!--
@license
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
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-->
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <link rel="import" href="roboto.html">
  <style>
    .roboto {
      font-family: Roboto
    }
  </style>
</head>
<body>
  <div>Regular</div>
  <div class="roboto">Roboto</div>
</body>
</html>