JSFiddle - React, Tailwind, and code Playground

by Neal

HTML

<textarea id="test" maxlength="10"></textarea>
length = <span id="length">0</span>

CSS

#test {
    height: 100px;
}

JavaScript

var TA = document.getElementById('test');
var SPAN = document.getElementById('length');

TA.onchange = function() {
    SPAN.innerText = TA.value.length;
}