Get window properties defined by the user

get-window-user-props.js

(function () {
    var results, currentWindow,

    // create an iframe and append to body to load a clean window object
    iframe = document.createElement('iframe');
    iframe.style.display = 'none';
    document.body.appendChild(iframe);

    // get the current list of properties on window
    currentWindow = Object.getOwnPropertyNames(window);
    
    // filter the list against the properties that exist in the clean window
    results = currentWindow.filter(function(prop) {
        return !iframe.contentWindow.hasOwnProperty(prop);
    });
  
    document.body.removeChild(iframe);
    
    // log an array of properties that are different
    console.log(results);
}());