CodePen Embed - <optgroup> tag

<select>
  <optgroup label="Asia">
    <option value="ph">Philippines</option>
    <option value="kr">South Korea</option>
    <option value="jp">Japan</option>
  </optgroup>
  <optgroup label="Europe">
    <option value="fr">France</option>
    <option value="de">Germany</option>
    <option value="it">Italy</option>
  </optgroup>
  <optgroup label="North America">
    <option value="us">United States</option>
    <option value="ca">Canada</option>
    <option value="mx">Mexico</option>
  </optgroup>
</select>

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