JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
    <textarea></textarea>
    <div class="msg"></div>
</div>

CSS

.wrap { margin: 30px; }
.msg { color: #666; height:30px;}
textarea { width: 500px; height: 100px; }

JavaScript

$('textarea').bind('input propertychange', function() {
    $('.msg').html($(this).val().length + ' characters');
});