<script src="http://www.polymer-project.org/platform.js"></script>

<script src="http://www.polymer-project.org/polymer.js"></script>

​

<polymer-element name="my-element" extends="div" noscript>

  <template>

    <style>

      :host {

        display: block;

        height: 100%;

        background: blue;

      }

    </style>

    <content></content>

  </template>

</polymer-element>

​

<div style="height: 100%;background:red;padding:10px;">

  <div is="my-element"></div>

</div>