The OPTGROUP element allows authors to group selection list choices
into a hierarchy. This is particularly helpful to non-visual user
agents when large numbers of options are available to choose from.
Possible rendering of this element could be a collapsible hierarchy
list of OPTION element content or some presentation conveying the
hierarchy relationship of the OPTION contents. Browsers not supporting
this element will "see" only a traditional flat list of
OPTION elements. The LABEL attribute for this element is used to
provide shorter labels for the nodes of the hierarchical menus.
Attributes:
disabled - This is a stand-alone
attribute which indicates the element is initially non-functional.
label - This specifies a shorter
alternate label for use in identifying the sub-group of options.
Example code:
<select NAME="Familytree">
<option LABEL="Bill" VALUE="bill">Bill Smith
<option LABEL="Mary" VALUE="mary">Mary Smith
<optgroup LABEL="Joe">
<option VALUE="michael">Michael Smith
<option VALUE="susan">Susan Smith
<option VALUE="howard">Howard Smith
</optgroup>
</select>
