Optgroup           

<select>
  <optgroup label="Fumetti">
    <option value="pippo">Pippo</option>
    <option value="topolino">Topolino</option>
  </optgroup>
  <optgroup label="Città">
    <option value="milano">Milano</option>
    <option value="roma">Roma</option>
  </optgroup>
</select>

attributi: attibuti globali || attributi di evento || disabled || label

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