<div class='select-group'> <select> <select> <option value='item'>select an item</option>
<div class='select-group'>
<select>
<option value='item'>select an item</option>
<div class='select-group'> <select id='select-1'> <option value='item'>select an item</option> <option value='item'>select an item</option> <option value='item'>select an item</option> </select> <label for='select-1'>Select label</label></div>
<select id='select-1'>
</select>
<label for='select-1'>Select label</label>
</div>