Tab and I were discussing the pageup/pagedown keys and noticed they weren't classified in https://www.w3.org/TR/css-scroll-snap-1/#scroll-types

We propose adding them to the "intended direction and end point" class, since they are definitely directional and also have a fairly explicit idea (to the user as well as the UA) of the amount by which we should scroll (even if that amount is a little fuzzy around the edges for cognitive stitching, it's understood to be a screenful).