[tomjen3]

If you do that, you are gong to break so many websites.

[userbinator]

All the better to let them know they shouldn't be doing that.

[adrianN]

That will be very popular with the users of your browser.

[HappyTypist]

No, I mean, a tiny bit of css hacking will let you detect it.

Have a css media query for every possible height, and every possible width, that loads a 1px empty png.