JSFiddle - React, Tailwind, and code Playground

HTML

<div>
www
</div>

CSS

div {
  width: 100px;
  height: 100px;
  border: 1px solid red;
}

JavaScript

var elem = document.body.children[0];
var event = new Event ('lol');

function zzz(){
var event = new Event ('lol');

if (elem.innerHTML == 'www'){
elem.dispatchEvent(event);
}

}


elem.addEventListener('zzz', function (){ alert ('событие сраболтало')})