I remember when we first did this on IE5.5. It fell out naturally from some improvements to the rendering system and a dev (forgot his name! Don?) prototyped it

I remember when we first did this on IE5.5. It fell out naturally from some improvements to the rendering system and a dev (forgot his name! Don?) prototyped it to show off his new subsystem. It eventually got supported because, at the time, we would do anything we could to differentiate. Long time ago...