Drop down list

In websites, a user interface control element which allows the user to choose one item from a list.

When a drop-down list is inactive, it displays a single value. When you click on the down arrow in the box, it “drops down” a list of values, from which the user may select one. When you select a new value, the box displays the selected value.

 

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See also: http://en.wikipedia.org/wiki/Widget_(computing)