Does iphone have it's own special html markup?

A long time ago (2-3 years) I remember stumbling across a developers guide on the apple website that explained how to create websites and menus using html, these menus and websites would closely resemble the default iphone menu screens - the purpose of this special html markup was to allow website developers to create websites that were properly formatted for iPhones.

I'm not sure if it was a special html markup or something else but I'm wondering if anyone can tell me because I have recently been trying to find it again.

It may have been since discontinued but I'm just curious to find it again if it's still active.

Does anyone know what I'm talking about?