JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://test.asl.cloud/cc/js/my-app.js"></script>
<button onclick="myFunction()">Try it</button>
<p id="test_doc"></p>
<p id="test_js"></p>

JavaScript

myFunction = function() {
 var x = document.lastModified;
 document.getElementById("test_doc").innerHTML = x;
            
 var se = document.getElementsByTagName('script');
 var s;
 for (var i = 0; i < se.length; i++) {
  if (typeof se[i].src !== 'undefined' && se[i].src.match('cloud')) {
   s = se[i];
   break;
  }
 }
 console.log(s);
 x = s.lastModified;
 document.getElementById("test_js").innerHTML = x;
}