<select>
<optgroup label="Category1">
<option value ="home">home</option>
<option value ="blog">blog</option>
<option value ="contact">contact</option>
</optgroup>
<optgroup label="Category2">
<option value ="home">home</option>
<option value ="blog">blog</option>
<option value ="contact">contact</option>
</optgroup>
</select>
