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In graphical user interface
The GUI ( "UI" by itself is still usually pronounced . or ), graphical user interface, is a form of user interface that allows User (computing), users to Human–computer interaction, interact with electronic devices through graphical icon (comp ...
s, the control element adjustment handle is a small box that appears on the corners and edges of a selected element such as another graphical control element like a window
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air. Modern windows are usually glazed or covered in some other transparent or translucent mate ...
. This allows the user to alter size or shape.
By dragging and dropping
In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, it can be used to ...
the control handle onto an edge, the user can make the control wider or narrower, taller or shorter. Corner handles let one move two edges at once.
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Graphical control elements
Graphical user interface elements