JSFiddle - React, Tailwind, and code Playground

by Chase Wilson

HTML

<textarea></textarea>
<div id="height"></div>

CSS

textarea {
width: 200px;
height: 2em;
overflow: hidden;
}

JavaScript

$$('textarea').addEvent('keyup',function(el){
    $('height').set('html',this.getScrollSize().y);
    this.setStyle('height',this.getScrollSize().y);
});