How to defer parsing of scripts loaded with WordPress wp_enqueue_script

functions.php

<?php

function yanco_defer_script_loader_tag( $tag, $handle, $src ) {
  $defer = array( 
    'magnific-popup',
    'cycle',
    'script'
  );
  if ( in_array( $handle, $defer ) ) {
     return '<script src="' . $src . '" defer="defer" type="text/javascript"></script>' . "\n";
  }
    
    return $tag;
} 
add_filter( 'script_loader_tag', 'yanco_defer_script_loader_tag', 10, 3 );

// If you're unsure about handles, you can use this function

add_action( 'wp_print_scripts', 'yanco_output_enqueued_scripts' );
function yanco_output_enqueued_scripts() {
	global $wp_scripts;
	echo "Handles: ";
	
	foreach( $wp_scripts->queue as $handle ) {
		echo $handle . ', ';
	}
		
		
}