html select
<label for="cars">Choose a car:</label> <select name="cars" id="cars"> <optgroup label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="n/a" disabled>unavailable</option> </optgroup> <optgroup label="German Cars"> <option value="mercedes" selected>Mercedes</option> <option value="audi">Audi</option> </optgroup> </select>
