JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" onclick="onBtnClick(event)" value="Click me" />
<div id="container">
</div>

JavaScript

function onBtnClick(event) {
	
  c = document.getElementById('container');
  
  c.innerHTML = '<b>Event target:</b> ' + event.target;
  c.innerHTML += '<br /><b>Caller:</b> ' + arguments.callee.caller;
}