JSFiddle - React, Tailwind, and code Playground

HTML

<div id="myDiv">

</div>

JavaScript

function load(url) {
  var myDiv = document.getElementById("myDiv");
  myDiv.innerHTML='<object type="text/html" data="'+url+'"></object>';
  fadeIn(myDiv);
  return false;
}

function fadeIn(el) {
  el.style.opacity = 0;
  var tick = function() {
    el.style.opacity = +el.style.opacity + 0.01;
    if (+el.style.opacity < 1) {
      (window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16)
    }
  };
  tick();
}

load('foo');