JS: Get all user defined window properties

getWindowProperties.js

(function () {
    // create an iframe and append to body to load a clean window object
    var iframe = document.createElement('iframe');
    iframe.style.display = 'none';
    document.body.appendChild(iframe);
    // get the current list of properties on window
    var currentWindow = Object.getOwnPropertyNames(window);
    // filter the list against the properties that exist in the clean window
    var results = currentWindow.filter(function(prop) {
        return !iframe.contentWindow.hasOwnProperty(prop);
    });
    // log an array of properties that are different
    console.log('Total user objects on window: ', results.length);
    console.log(results);
    document.body.removeChild(iframe);
}());