Example loading module vs no module

Test.js

(function(d) {
  var script = d.createElement("script");
  script.type = "text/javascript";
  script.text =
    'import("https://passwordless.app/account/module/integrated.js");window.supportsDynamicImport = true;';

  d.getElementsByTagName("head")[0].appendChild(script);

  var script2 = d.createElement("script");
  script2.type = "text/javascript";
  script2.text =
    'if (!window.supportsDynamicImport) {const systemJsLoaderTag = document.createElement("script");systemJsLoaderTag.src = "https://unpkg.com/systemjs@2.0.0/dist/s.min.js";systemJsLoaderTag.addEventListener("load", function() {System.import("https://passwordless.app/account/nomodule/integrated.js");});document.head.appendChild(systemJsLoaderTag);}';
  d.getElementsByTagName("head")[0].appendChild(script2);

  var link = d.createElement("link");
  link.rel = "stylesheet";
  link.type = "text/css";
  link.href = "https://passwordless.app/fonts/fonts.css";
  d.getElementsByTagName("head")[0].appendChild(link);
})(document);