JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="iframe1" src="" width="920" height="900" border="2"></iframe>

JavaScript

function setIframeSrc() {
  var s = "http://lx5.in/CGIT-Results-p2-2013.php";
  var iframe1 = document.getElementById('iframe1');
  iframe1.src = s;
  setTimeout(function(){
      if (window.stop) {
          window.stop();
          alert('stopped');
      } else {
          document.execCommand('Stop');
          alert('stopped2');
      }
  }, 5000);
}
setTimeout(setIframeSrc, 5000);