JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <button style="padding: 3em;" id="my-button">Button</button>
  <span>Handler fired: <span id="num-times">0</span> times</span>
</div>

JavaScript

var numTimes = 0;
function testHandler() {
	console.log("Handler fired");
  numTimes++;
  document.getElementById("num-times").innerHTML = numTimes;
}

	document.getElementById("my-button").addEventListener("click", testHandler);