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<form action="pagina.html" method="post">
	<label for="colori">Che colori ti piacciono?</label>
	<select name="colori" id="colori" multiple>
		<optgroup label="caldi">
<option value="giallo" selected>giallo</option>
<option value="arancione">arancione</option>
<option value="rosso">rosso</option>
</optgroup>
<optgroup label="freddi">
<option value="verde">verde</option>
<option value="blu">blu</option>
<option value="viola">viola</option>
</optgroup>
	</select>
</form>