Method detachedCallback

src/base-element.js:458–460

* Override in subclass to adjust the element when it is being removed from * the DOM. Could e.g. be used to remove a listener.

()

   * the DOM. Could e.g. be used to remove a listener.
   */
  detachedCallback() {
    // Subclasses may override.
  }

  /**
   * Set itself as a container element that can be monitored by the scheduler