Test whether download happens before or after onload

[bluesmoon]

I know that most browsers will download CSS that isn't valid in the current view because of the possibility that the view may suddenly change. This is a simple way to make it future proof... probably not the best way, but it works.

What would be more interesting would be to see if these downloads happen before or after the page's onload even fires. If after, then the browsers are doing the right thing, if before, then that's wasting bandwidth.