JSFiddle - React, Tailwind, and code Playground

by billccn

HTML

<textarea>a</textarea>

<pre>a</pre>

CSS

pre { visibility: hidden }

textarea, pre { font-size: 20px;}

JavaScript

$(function(){
    $('textarea').on('keypress change', function() {
        $(this).height($('pre').text(this.value + '\na').height());
    });
})