JSFiddle - React, Tailwind, and code Playground

HTML

Here is the example:
<div id='example'>Click this div</div>

CSS

#example {
    cursor: pointer;
    background-color: #DDD;
    width: 100px;
    height: 100px;
}

JavaScript

var element = document.getElementById('example')
element.onclick = function(e) {
  var x = e.pageX - element.offsetLeft
  var y = e.pageY - element.offsetTop
  alert('x : ' + x + ', y : ' + y)
}