> Now I can develop for Firefox, and know it is going to work in Safari, Opera, Chrome, etc... Not in my experience; there are all sorts of nooks and crannies

> Now I can develop for Firefox, and know it is going to work in Safari, Opera, Chrome, etc... Not in my experience; there are all sorts of nooks and crannies that catch you out between those browsers (not that IE isn't worse of course :))