A lot of people are saying "the difference with IE6 is that the iPhone is standards-based and open," but I don't think that's right. The problem that PPK is poi

A lot of people are saying "the difference with IE6 is that the iPhone is standards-based and open," but I don't think that's right. The problem that PPK is pointing out is that developing for a single browser is bad, full stop. It doesn't matter if the browser is the holy incarnation of HTML5 itself, if you're not testing a wide variety of browsers - or worse, relying on proprietary extensions that you know not to be compatible - you're making the same mistake that was made with IE6.