JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<body>  <a href="http://www.google.pt" id="test">Google</a>
</body>

JavaScript

window.onbeforeunload = function (e) {
  var e = e || window.event;
  e.returnValue = "sure?";
}
var test = document.getElementById("test");
test.onclick = function () {
  window.onbeforeunload = function () { };
}