Method pauseCallback

src/base-element.js:616–616

* Requests the element to stop its activity when the document goes into * inactive state. The scope is up to the actual component. Among other * things the active playback of video or audio content must be stopped. * TODO(#31915): remove once R1 migration is complete.

()

   * TODO(#31915): remove once R1 migration is complete.
   */
  pauseCallback() {}

  /**
   * Requests the element to resume its activity when the document returns from