WP_Customize_Selective_Refresh::export_preview_data

			/* translators: %s: document.write() */
			'badDocumentWrite' => sprintf( __( '%s is forbidden' ), 'document.write()' ),
		);
		if ( $switched_locale ) {
			restore_previous_locale();
		}

		$exports = array(
			'partials'       => $partials,
			'renderQueryVar' => self::RENDER_QUERY_VAR,
			'l10n'           => $l10n,
		);

		// Export data to JS.
		printf( '<script>var _customizePartialRefreshExports = %s;</script>', wp_json_encode( $exports ) );
	}

	/**
	 * Registers dynamically-created partials.
	 *
	 * @since 4.5.0
	 *
	 * @see WP_Customize_Manager::add_dynamic_settings()
	 *
	 * @param string[] $partial_ids Array of the partial IDs to add.
	 * @return WP_Customize_Partial[] Array of added WP_Customize_Partial instances.
	 */
	public function add_dynamic_partials( $partial_ids ) {
		$new_partials = array();

		foreach ( $partial_ids as $partial_id ) {