Building web pages with XHTML 1.1 |  |
Building web pages with XHTML 1.1 | |
Inside a select control, the optgroup element allows you to group options
into categories. This can be useful when there are a lot
of options. Instead of a sequence of option elements inside the select element, you
use a sequence of optgroup elements, each
of which in turn contains a sequence of option elements:
element optgroup
{ attribute label { text },
Common.attrib,
option+
}
label
This required attribute is the name of the category for this option group.
Common.attrib
Use any of the attributes described in Section 15.3, “The common attributes: Common.attrib”.
option+
The content is a sequence of one or more option elements; see Section 14.5, “The option element: One choice inside
a select control”.