Twenty_Twenty_One_Dark_Mode::html_classes( string $classes ): string

219	public function html_classes( $classes ) {220		if ( ! $this->switch_should_render() ) {221			return $classes;222		}223 224		$background_color            = get_theme_mod( 'background_color', 'D1E4DD' );225		$should_respect_color_scheme = get_theme_mod( 'respect_user_color_preference', false );226		if ( $should_respect_color_scheme && 127 <= Twenty_Twenty_One_Custom_Colors::get_relative_luminance_from_hex( $background_color ) ) {227			return ( $classes ) ? ' respect-color-scheme-preference' : 'respect-color-scheme-preference';228		}229 230		return $classes;231	}