Debugging with JavaScript
javascript:moveTo(0,0);resizeTo(1024,768); - change the current browser window to the specified size. Note this is not 100% accurate display of what an end user will see.
javascript:alert(document.cookie); - Shawn's trick to show all cookies in browser.
Explains the console - http://buildinternet.com/2010/12/debugging-javascript-behind-the-scenes/
Useful JavaScript Tricks
Resolution
In the browser address bar,
To determine the actual size of the browser window, use the following properties:
Internet Explorer (backward-compatibility mode):
document.body.offsetWidth, document.body.offsetHeight
Internet Explorer (standards mode, document.compatMode=='CSS1Compat'):
document.documentElement.offsetWidth, document.documentElement.offsetHeight
Most other browsers:
window.innerWidth, window.innerHeight