jQuery addClass example
HTML
<script src="https://cdn.jsdelivr.net/npm/[email protected]/js/tail.select.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/css/default/tail.select-dark.css">
<select id='select'>
<option>My Option</option>
</select>
JavaScript
let instance = tail.select("select", { /* Your Options */ });
instance.options.add("New Option", 'Value', false, false, false, 'Description', true);