Many websites already exhibit what I’d define as high proxority in that they take great care to use techniques that account for both priority (bringing attention to certain elements) and proximity (making reactions happen directly next to or above the objects being interacted with).

Proxority: Origami for the Web

The proxority principle posits that everything you find on a web page can be assigned a value and a place in sequence, in relation to the objects that surround it. This idea has existed since the early days of the Web, but too few designers pay enough attention to it. Think through what is actually needed, where it is needed and when it should appear (as opposed to simply putting all of the content on the screen, in its entirety, in an order that “looks pretty”). The need for such techniques is increasing, especially given the proliferation of handheld devices and the idea of designing with a “mobile-first” philosophy.