Mobile

Drag a row sideways and buttons you never knew were there slide out from under it.

The circle parked over the content in one corner of the screen, usually a plus that starts something new.

You drag the list down a little and let go, and a spinner brings in whatever is new. There is no button; you have to already know it is there.

The short list of commands that rises from the bottom edge, red delete at the top and cancel sitting on its own at the bottom.

The panel that comes up from the bottom edge and parks halfway. Flick it back down and it goes away.

The strip of icons glued to the bottom of a phone app. Each one is a whole section that remembers where you left it.