Four full-height panels, each of which stops on its own edge. Scroll
with the wheel, with a finger, or put focus inside the frame and move
through them with the arrow keys. The bar on the right says where you
are.
↓
This is the first panel. Keep scrolling to see the snapping
↓
Any section at all can become a snapping panel. This one
takes up the whole screen. Except that…
nothing forces it to take up the whole screen: the component
fits in a corner of a page, on a small screen as on a large
one.
