JSFiddle - React, Tailwind, and code Playground

HTML

<div id="one"></div>

JavaScript

var iframe = document.createElement("iframe");
iframe.style.display = "none";
iframe.onload = function (){
  iframe.style.display = "block";    
  alert("loaded");
};
// I start the file download
iframe.src ='http://www.test.com';

document.getElementById("one").appendChild(iframe);