I'd prefer to use a span as it's inline. If you put a div in a h1 and put it into the wdg validator - http://www.htmlhelp.com/tools/validator/direct.html it fails, though for a reason I don't actually agree with. (h1 isn't inline to the best of my knowledge).

However the only reason I've used this sort of thing for is avoiding box model problems by putting width on one and margins one the other. Is there another use? :curious: