EDIT: As of 2012-06-11 this bug has been finally fixed! https://bugs.webkit.org/show_bug.cgi?id=35981#c1
I have some pretty straightforward markup:<
Well, really isn't "just another block-level element." Maybe it should be, but the fact is that it inherently is going to have layout peculiarities in that it's supposed to do something pretty weird, as elements go. Between IE and Firefox, the effects of margin and padding on
elements are a lot different.
Do you want to just separate content from the top of the box? If so, I'd try playing with
padding-top
of the fieldset itself.