Method attemptCollapse

src/base-element.js:855–859

* Return a promise that request the runtime to collapse one element * @return {!Promise}

()

   * @return {!Promise}
   */
  attemptCollapse() {
    return Services.mutatorForDoc(this.getAmpDoc()).attemptCollapse(
      this.element
    );
  }

  /**
   * Requests the runtime to update the height of this element to the specified