Geolocate using Wikimedia's Geo IP Lookup service

geolocate.js

var geolocate = function(callback) {
  callback = typeof callback === "function" ? callback : function(){};
  if ('Geo' in window) {
    callback(window.Geo);
  } else {
    var script = document.createElement('script');
    script.src = "https://geoiplookup.wikimedia.org/";
    script.onload = function() { callback(window.Geo) };
    document.head.appendChild(script);
  }
};