-style: italic}</style>
      <div class="frame">${super.template}</div>
      <div>\</div>
    `;
  }
  constructor() {
    super();
    this.myProp = {stuffThatGoesHere: '!stuff that goes here!'};
  }
  static get headerTemplate() { return html`<h2>Sub-header</h2>`; }
  static get footerTemplate() { return html`<h2>Sub-footer</h2>`; }
}
customElements.define(SubClass.is, SubClass);
</script>
  <script type="module">
import { PolymerElement } from '../../polymer-element.js';
class XString extends PolymerEl