JSFiddle - React, Tailwind, and code Playground

by Mario Nebl

HTML

<div id="current">124</div>
<span id="resultKey"></span><span id="resultVale"></span>

JavaScript

var resultKey = document.getElementById('resultKey');
var resultVale = document.getElementById('resultVale');

function log(key, value) {
  resultKey.innerHTML = key;
  resultVale.innerHTML = value;
}

var after;
var el = document.getElementById('current');
var before = el.innerHTML;

log('before:', before);
el.innerHTML = 42

setTimeout(function(){
   after = el.innerHTML;
}, 1000);

setTimeout(function(){
  log('after:', after);
}, 2000);