Tooltip
A short label on hover or focus, for naming something the interface cannot afford to spell out — an icon button, a truncated value. It holds no interactive content and cannot be reached by keyboard beyond its trigger, so anything the reader needs to click belongs in a Popover.
Usage
Examples
With description
A second line for a consequence rather than a name. This is the ceiling — past it, the
content wants a Popover.
With nested dialog
A tooltip on a trigger that also opens a dialog, checking the tooltip dismisses rather than hanging over the panel.
With kbd
A Kbd inside the tooltip, which is the convention for naming a control and its shortcut in
one breath.