designer

designer.html

<link rel="import" href="../components/polymer/polymer.html">

<polymer-element name="hello-er" attributes="what">

  <template>
    <style>    
    </style>
    <div>
      <strong>{{ what }}</strong>
    </div>
  </template>

  <script>

    Polymer('hello-er', {
      attached: function () {
         console.log('attached');
       }
    });

  </script>

</polymer-element>