Drop-down list
User interface element
A drop-down list (DDL), drop-down menu or just drop-down, also known as a drop menu, pull-down list, picklist, is a graphical control element, similar to a list box, that allows the user to choose one value from a list either by clicking or hovering over the menu. When a drop-down list is inactive, it displays a single value. When activated, it displays (drops down) a list of values, from which the user may select one. When the user selects a new value, the control reverts to its inactive state, displaying the selected value. It is often used in the design of graphical user interfaces, including web design.
01Terminology
This type of control is called a "pop-up menu" on the Macintosh platform; however, the term "pop-up menu" is used to refer to context menus in other GUI systems. The Macintosh also has the notion of "pull-down menus". The distinction is that, when the menu is closed, a pop-up menu's title shows the last-selected item while a pull-down menu shows a static title like a menu in the menu bar. Thus, the uses are different, pop-up menus are used to select a single option from a list while pull-down menus are used to issue commands or in cases where multiple options can be selected.

02HTML
In web forms, the HTML elements <select> and <option> are used to display a drop-down menu:
<select> <option>option1</option> <option>option2</option> <option>option3</option> </select>Sources and credits
This article is adapted from the Wikipedia article “Drop-down list”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Drop-down list example.PNG by Jaksmata, Public domain
- Dewiki-suggesting-searchplugin.png by Wikinaut, CC BY-SA 4.0
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