A combo box is a commonly used graphical user interface widget (or control). Traditionally, it is a combination of a drop-down list or list box and a single-line editable textbox, allowing the user to either type a value directly or select a value from the list. The term "combo box" is sometimes used to mean "drop-down list". [1] In both Java and .NET, "combo box" is not a synonym for "drop-down list". [2] [3] Definition of "drop down list" is sometimes clarified with terms such as "non-editable combo box" (or something similar) to distinguish it from "combo box".
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To make a combo box like shown in the image above in HTML, one can write the following code:
<inputlist="comboboxlist"value="Something else"><datalistid="comboboxlist"><optionvalue="List item 1"><optionvalue="List item 2"><optionvalue="List item 3"><optionvalue="List item 4"></datalist>