Chosen jQuery: fastest implementation!

chosen.html

<!-- jQuery (comment the next line if you've already loaded it) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<!-- CSS -->
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.min.css">
<
<!-- JS -->
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/chosen/1.8.7/chosen.jquery.min.js"></script>

<script>
$(document).ready(function(){
	$(".chosen-select").chosen();
});
</script>