Yes, and many of this things are "in general" not well supported by anything but adobe PDF. Even most simple interactive things can easily not work correctly e

Yes, and many of this things are "in general" not well supported by anything but adobe PDF. Even most simple interactive things can easily not work correctly even in more widely spread PDF readers. IMHO PDF is in many ways worse then HTML, it's just that this ways are less commonly used, but if you start a PDF instead of HTML trend it's just a matter of time until this "not so compatible" aspects of PDF become widely used by some people.