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A tooltip is often used to specify extra information about something when the user moves the mouse pointer over an element: Top. Right.
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Tooltip

The tooltip, also known as infotip or hint, is a common graphical user interface element in which, when hovering over a screen element or component, a text box displays information about that element, ... Wikipedia
tooltip from en.m.wikipedia.org
The tooltip, also known as infotip or hint, is a common graphical user interface (GUI) element in which, when hovering over a screen element or component, ...
tooltip from m2.material.io
Tooltips display informative text when users hover over, focus on, or tap an element.
Tooltips display informative text when users hover over, focus on, or tap an element.
The ToolTip command shows an always-on-top window anywhere on the screen.