Originally Posted by potter

What?!

For starters 0px means zero pixels. 0px has nothing to do with corners, it's a definition of measurement.

Secondly, if different browsers render 0px differently. And if "top left" is different in different browsers. I'd love to see some information on it.

I guarantee you can't find me one shred of information stating how 0px will be rendered as say 0px in firefox but .5 pixels in internet explorer, or 1.3456 pixels in opera.

I'd also love to see some information that states "top left", is not defined as the top left corner of an element in some browser.

Like whoa, what you're saying is happening goes against every thing that is known about the browser rendering and css.