JSFiddle - React, Tailwind, and code Playground

HTML

<div id="counter"></div>

JavaScript

var runtime=Date.now();
var counter=Math.round(runtime/1000-1436233981);
var c=window.document.getElementById('counter');
function r(){
  counter+=Math.round(2*Math.random());
  c.innerHTML=counter;
}
r();var timer = setInterval(r, 5000);