Opção de seleção HTML dividida
<select name="fashion">
<optgroup label="Clothing">
<option value="t_shirt">T-Shirts</option>
<option value="sweater">Sweaters</option>
<option value="coats">Coats</option>
</optgroup>
<optgroup label="Foot Wear">
<option value="sneakers">Sneakers</option>
<option value="boots">Boots</option>
<option value="sandals">Sandals</option>
</optgroup>
</select>
Pleasant Puffin