HTML <select> multiple Attribute

Example

A drop-down list that allows multiple selections:

<label for="cars">Choose a car:</label>

<select name="cars" id="cars" multiple>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>

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Definition and Usage

The multiple attribute is a boolean attribute.

When present, it specifies that multiple options can be selected at once.

Selecting multiple options vary in different operating systems and browsers:

For windows: Hold down the control (ctrl) button to select multiple options
For Mac: Hold down the command button to select multiple options

Because of the different ways of doing this, and because you have to inform the user that multiple selection is available, it is more user-friendly to use checkboxes instead.