JavaScript URL isn't working

[kdjuiopo]

Hey

I'm trying to change around websites (not permanently, just for fun) and tried this:

You know how some JS 'hacks' you type into the URL? I know about the contentEditable one, but I tried to make a simple one:

javascript: document.body.style.background='red';

But that just gives me a blank page saying 'red'. WTH?

How can I get it so the website actually turns red? Thanks

[rajmv]

You can't. Stop hacking and start coding apps. :p