function wp_add_iframed_editor_assets_html() {
	$script_handles = array();
	$style_handles  = array(
		'wp-block-editor',
		'wp-block-library',
		'wp-block-library-theme',
		'wp-edit-blocks',
	);

	$block_registry = WP_Block_Type_Registry::get_instance();

	foreach ( $block_registry->get_all_registered() as $block_type ) {
		if ( ! empty( $block_type->style ) ) {
			$style_handles[] = $block_type->style;
		}

		if ( ! empty( $block_type->editor_style ) ) {
			$style_handles[] = $block_type->editor_style;
		}

		if ( ! empty( $block_type->script ) ) {
			$script_handles[] = $block_type->script;
		}
	}

	$style_handles = array_unique( $style_handles );
	$done          = wp_styles()->done;

	ob_start();

	wp_styles()->done = array();
	wp_styles()->do_items( $style_handles );
	wp_styles()->done = $done;

	$styles = ob_get_clean();

	$script_handles = array_unique( $script_handles );
	$done           = wp_scripts()->done;

	ob_start();

	wp_scripts()->done = array();
	wp_scripts()->do_items( $script_handles );
	wp_scripts()->done = $done;

	$scripts = ob_get_clean();

	$editor_assets = wp_json_encode(
		array(
			'styles'  => $styles,
			'scripts' => $scripts,
		)
	);

	echo "<script>window.__editorAssets = $editor_assets</script>";
}