I take the point but I don't think this is valid criticism of IE9's 'modern' pretentions. (And anyway, Chrome doesn't run on mobile devices, neither does Safar

I take the point but I don't think this is valid criticism of IE9's 'modern' pretentions. (And anyway, Chrome doesn't run on mobile devices, neither does Safari. What you have are various implementations of Webkit, all different across the various OS versions.)