How to perform this trick?
Open any website of your choice (like facebook) in browser (internet explorer,google chrome,firefox) and clear the address bar of the browser.
And thats it.Now Click on any text and Start editing that is written on that page. You Can take its Snapshot after editing and show that to your friends and became Hacker in front of them ;).
How this trick actually work?
document.designMode=’on’ tells the browser to turn the designmode on
void 0 tells the browser not to show any error
So, enjoy this funny trick to hack facebook.