[mediaqueries4] Media queries for viewport positions

Hi,

Is there anything preventing the creation of media queries based on the
viewport position? More specifically, a media query that would fire *x
*distance
from the top of the document? To stay brief the rough basic spec would be
something like this.

@media type="viewport" from(height: 300px) to(height:800px) {
....
}

This will then give specific styles when the viewport is between 300-800px
from the top of the document. There is a lot of possibility for use and
growth an media query of this type.

Thank you for your time,
Chris Wilson