Term: tooltip

A tooltip is a typically small floating box of textual information that appears after a short delay when the mouse pointer is hovered or placed over an item that has additional information.

One good example are these glossary definitions themselves: in normal articles portions appear as tooltips for words that have glossary entries.

An example of a tooltip
One example of a tooltip

Tooltips are often present for buttons, menu items, and other common controls in Windows applications.

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