This is just a javascript trick and its going to make it possible for you to editi a webpage live in your browser and change the details according to your wish. mind you whatever you edit here is not permanent because this command will not automatically save what you have edited on the directory the page is hosted.
Imagine a world where you are a God and have ultimate control on what happens and more importantly, how it happens. Seems too good a dream. Now it has come true, at least for the online world.
Some of you are thinking the other way now. Any way or purpose you may wish to use this trick for is at your own risk.
For you to make the page editable just copy the code below and paste in the address bar of the page you may wish to edit.

javascript:document.body.contentEditable%20=%20'true';%20document.designMode='on';%20void%200

and strike enter on your keyboard and starting editing anything you wish to. This edited webpage of your can only be save on your Pc either for your printing but it is never going to be saved on the server.