HTML/CSS/Form Attributes/label optgroup
"label" sets the text for an "optgroup" element
<source lang="html4strict">
<HTML> <BODY> <form name="form1" method="post" action="">
<select name="select1"> <optgroup label="first group"> <option>first item in first group </option> <option>second item in first group </option> <option>third item in first group </option> </optgroup> <optgroup label="second group"> <option>first item in second group </option> <option>second item in second group </option> <option>third item in second group </option> </optgroup> </select>
</form> </BODY> </HTML>
</source>