Ever seen a fake page on the internet that look like a news article or product listing from a reputable site? You probably have. Do you wanna know how they do it?
Well here's how:
1) Go the site that you want to edit
2) Copy this code into your address bar and press enter. Make sure the whole thing is copied properly.
javascript:document.body.contentEditable='true'; document.designMode='on'; void 0
3) Just edit like a normal document. You can add/delete things, and even copy and paste!
Have fun!
Note: Changes that you make to a website can't be seen by other people, only by you, and those changes cannot possibly be saved. But you can go ahead and take screenshots and make it look real.
Happy Editing and Pranking! :D