Alternatif Combo Bertingkat

<!-- contoh 1 (Grouping) -->
<select>
<optgroup label="Nasi">
<option value="11">Nasi Goreng</option>
<option value="12">Nasi Rames</option>
<option value="13">Nasi Kucing</option>
</optgroup>
<optgroup label="Teh">
<option value="21">Teh Tawar</option>
<option value="22">Teh Manis</option>
<option value="23">Ice Lemon Tea</option>
</optgroup>
</select>

<!-- contoh 2 (Menjorok) -->
<select>
<option value="10">Nasi</option>
<option value="11"> Nasi Goreng</option>
<option value="12">- Nasi Rames</option>
<option value="13">- Nasi Kucing</option>
<option value="21">Teh</option>
<option value="22">- Teh Tawar</option>
<option value="23">- Teh Manis</option>
<option value="24">- Ice Lemon Tea</option>
</select>