extensions/amp-story/1.0/amp-story.js
/**
   * Resumes the whole story on viewer visibilityState updates, or tab
   * visibility updates.
   * @private
   */
Resumes the whole story on viewer visibilityState updates, or tab
visibility updates.
@private
Resumes the whole story on viewer visibilityState updates or tab visibility updates . @private
resume_() {
    this.restorePausedState_();
    if (!this.storeService_.get(StateProperty.MUTED_STATE)) {
      this.playBackgroundAudio_();
    }
  }
resume_ ( ) { this . restorePausedState_ ( ) ; if ( ! this . storeService_ . get ( StateProperty . MUTED_STATE ) ) { this . playBackgroundAudio_ ( ) ; } }
Resumes the whole story on viewer visibilityState updates, or tab
 visibility updates.
Resumes the whole story on viewer visibilityState updates or tab visibility updates .