Yes, i can see some problems: - First, in the worst case users will switch between browsers all the time, but users only want one place to store their bookmark

Yes, i can see some problems: - First, in the worst case users will switch between browsers all the time, but users only want one place to store their bookmarks and cookies - Second, even worse, if this would become a common practice, every browser manufacturer (especially MS) would just develop their own HTML "extensions", the standard would drift apart even more and the ultimate goal to achieve 100% standard compliant browsers would be out of reach. I can see how MS would implement new HTML and Javascript functionality to offer developers new features and in the end tie them to their browser