index.html

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>Kapton sample (Polymer 2)</title>

  <script>
    // Setup Polymer options
    window.Polymer = {
      dom: 'shadow',
      lazyRegister: true
    };

    // Load webpack bundle dynamically so it'll be not handled by polymer-cli.
    var script = document.createElement('script');
    script.src = 'app/bundle.js';
    document.head.appendChild(script);
  </script>

  <style>
    body {
      font-family: 'Roboto', 'Noto', sans-serif;
      font-size: 14px;
      margin: 0;
      background: #eee;
    }
  </style>

  <script src="app/bower_components/webcomponentsjs/webcomponents-loader.js"></script>
  <link rel="import" href="app/components/sample-app.html">

</head>

<body unresolved>
  <sample-app></sample-app>
</body>

</html>