IE doesn't have the URL method, I needed to parse a URL with potential IE11 support. Polyfill the bare minimum of the method with regex. Doesn't support username:password pairs in URLs

url-polyfill.js

if (typeof window.URL !== 'function') {
  window.URL = function(url) {
    var badUrl = new TypeError("Failed to construct 'URL': Invalid URL");
    if (typeof url !== 'string') {
      throw badUrl;
    }
    var match = url.match(/^(?<origin>(?<protocol>[^\/]+?)\/\/(?<host>(?<hostname>[^:]+)(:|)(?<port>[^\/]*?)))(?<pathname>\/[^\?\n]*)(?<search>(\?|)[^\n]*)/);
    if (match === null) {
      throw badUrl; 
    }
    for (var key in match.groups) {
      this[key] = match.groups[key];
    }
    this.href = url;
  }
}