Punk-UnDeaD

((document, window) => {
  window.App = window.App || {};
  let tag = null;
  let YT = null;
  const html = document.querySelector('html');
  App.YT = function (callback) {
    if (!tag) {
      tag = document.createElement('script');
      tag.src = "https://www.youtube.com/iframe_api";
      document.querySelector('head').append(tag);