CodePen Embed - balise optgroup

<select>
  <optgroup label="Légume">
    <option value="haricot">Haricot</option>
    <option value="poireau">Poireau</option>
    <option value="carotte">Carotte</option>
  </optgroup>
  <optgroup label="Fruit">
    <option value="pomme">Pomme</option>
    <option value="poire">Poire</option>
    <option value="fraise">Fraise</option>
  </optgroup>
</select>

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