Forms - HTML and XHTML: The Definitive Guide - page 602

<select>

Function Creates single- and multiple-choice menus

class , dir , disabled , id , lang , multiple , name ,
notab , onBlur , onChange , onClick ,
onDblClick , onFocus , onKeyDown , onKeyPress ,
onKeyUp , onMouseDown , onMouseMove , onMouseOut ,
onMouseOver , onMouseUp , size , style , tabindex ,

Attributes

, title taborder

</select> ; never omitted

End tag

Contains select_content

Used in form_content

As with other form tags, the name attribute is required and used by the
browser when submitting the <select> choices to the server. Unlike with
radio buttons, no item is preselected, so if the user doesn't select one,
the browser doesn't send any value to the server with the submitted
form.

Otherwise, the browser submits the selected item with the name attribute
value when submitting <select> form data to the server.