Everything on this page travels at the speed of the scroll.
Nothing is offset, delayed, pinned, faded or scaled.
A tall band with a position: sticky rail, which is stationary while the band
passes and therefore looks exactly like something moving against the scroll. It is not
marginalia and must not be counted.
Bands of real depth, so the container has somewhere to walk.
The census must come back empty.
A page that only scrolls is a still page.