polymer-element: manipulating an attribute containing html

gistfile1.txt

<polymer-element name="x-peeps" attributes="people">
  <template>
    <div id="bio"></div>
  </template>
  <script>
    Polymer('x-peeps', {
      peopleChanged: function() {
        this.$.bio.innerHTML = this.people;
      }
    });
  </script>
</polymer-element>