CODE EXAMPLE FOR JAVASCRIPT

spliting html select option

<select name="fashion">
  <optgroup label="Clothing">
    <option value="t_shirt">T-Shirts</option>
    <option value="sweater">Sweaters</option>
    <option value="coats">Coats</option>
  </optgroup>
  <optgroup label="Foot Wear">
    <option value="sneakers">Sneakers</option>
    <option value="boots">Boots</option>
    <option value="sandals">Sandals</option>
  </optgroup>
</select>