extensions/amp-story/1.0/amp-story-system-layer.js
/**
   * Reacts to story having elements with playback.
   * @param {boolean} hasPlaybackUi
   * @private
   */
Reacts to story having elements with playback.
@param {boolean} hasPlaybackUi
@private
Reacts to story having elements with playback . @param { boolean } hasPlaybackUi @private
onStoryHasPlaybackUiStateUpdate_(hasPlaybackUi) {
    this.vsync_.mutate(() => {
      this.getShadowRoot().classList.toggle(
        'i-amphtml-story-has-playback-ui',
        hasPlaybackUi
      );
    });
  }
onStoryHasPlaybackUiStateUpdate_ ( hasPlaybackUi ) { this . vsync_ . mutate ( ( ) => { this . getShadowRoot ( ) . classList . toggle ( 'i-amphtml-story-has-playback-ui' , hasPlaybackUi ) ; } ) ; }
Reacts to story having elements with playback.
Reacts to story having elements with playback .