Method collapse

src/base-element.js:847–849

* Collapses the element, setting it to `display: none`, and notifies its * owner (if there is one) through collapsedCallback that the element * is no longer visible.

()

   * is no longer visible.
   */
  collapse() {
    Services.mutatorForDoc(this.getAmpDoc()).collapseElement(this.element);
  }

  /**
   * Return a promise that request the runtime to collapse one element