WP_REST_Widget_Types_Controller::render_legacy_widget_preview_iframe() WordPress Method

	private function render_legacy_widget_preview_iframe( $id_base, $instance ) {
		if ( ! defined( 'IFRAME_REQUEST' ) ) {
			define( 'IFRAME_REQUEST', true );
		}

		ob_start();
		?>
		<!doctype html>
		<html <?php language_attributes(); ?>>
		<head>
			<meta charset="<?php bloginfo( 'charset' ); ?>" />
			<meta name="viewport" content="width=device-width, initial-scale=1" />
			<link rel="profile" href="https://gmpg.org/xfn/11" />
			<?php wp_head(); ?>
			<style>
				/* Reset theme styles */
				html, body, #page, #content {
					padding: 0 !important;
					margin: 0 !important;
				}
			</style>
		</head>
		<body <?php body_class(); ?>>
		<div id="page" class="site">
			<div id="content" class="site-content">
				<?php
				$registry = WP_Block_Type_Registry::get_instance();
				$block    = $registry->get_registered( 'core/legacy-widget' );
				echo $block->render(
					array(
						'idBase'   => $id_base,
						'instance' => $instance,
					)
				);
				?>
			</div><!-- #content -->
		</div><!-- #page -->
		<?php wp_footer(); ?>
		</body>
		</html>
		<?php
		return ob_get_clean();
	}
Uses	Description
wp-includes/class-wp-block-type-registry.php:WP_Block_Type_Registry::get_instance()	Utility method to retrieve the main instance of the class.
wp-includes/general-template.php:language_attributes()	Displays the language attributes for the ‘html’ tag.
wp-includes/general-template.php:wp_head()	Fire the wp_head action.
wp-includes/general-template.php:wp_footer()	Fire the wp_footer action.
wp-includes/general-template.php:bloginfo()	Displays information about the current site.
wp-includes/post-template.php:body_class()	Displays the class names for the body element.