To add the async attribute to the script produced by Autoptimize, copy and paste this code snippet — in plain text — to your functions.php file, or, add it with a plugin like Code Snippets.
add_filter('autoptimize_filter_js_defer','my_ao_override_defer',10,1);
function my_ao_override_defer($defer) {
return $defer."async ";
}
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