Defer Loading comment-reply.min.js in WP

This is one way to defer the WordPress core comment-reply script, which is “comment-reply.min.js”. The following PHP function will add the “defer” attribute to the script tag for “comment-reply.min.js”.

function my_defer_scripts($tag, $handle, $src) {
	if ('comment-reply' == $handle) return "<script type='text/javascript' defer src='$src'></script>";
   return $tag;
add_filter('script_loader_tag', 'my_defer_scripts', 10, 3);

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