Web Design in a Nutshell, 3rd Edition

Creating Menus with the select Element

The select element creates a menu of options that is more compact than groupings of checkboxes or radio buttons. A menu displays as either a pull-down menu or as a scrolling list of choices, depending on how the size is specified. The select element works as a container for any number of option elements. It may also contain one or more optgroups, which are used to define a logical group of option elements.