<html>
<body>
<select>
<optgroup label="Numbers">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</optgroup>
<optgroup label="Letters" disabled="true">
<option value="4">A</option>
<option value="5">B</option>
<option value="6">C</option>
</optgroup>
<optgroup label="Numbers set">
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</optgroup>
</select>
</body>
</html>
Grouping items in a drop-down list box is easy with the optgroup element. Theoptgroup element is a child to the select element and has two attributes:label (required) and disabled (optional). The required label attribute specifies the text that will appear as a header to the contained group of options. Many browsers render the label text in bold italic. The optional disabled attribute is used to render the entire group of options non-selectable to the user. Options within an option group are indented.
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