Gets the rendered markup for the default fallback blocks.

Return

Source

private static function get_default_fallback_blocks() {
	$registry = WP_Block_Type_Registry::get_instance();

	// If `core/page-list` is not registered then use empty blocks.
	return $registry->is_registered( 'core/page-list' ) ? '<!-- wp:page-list /-->' : '';
}

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