<s-select label="Shipping destination">
  <s-option-group label="North america">
    <s-option value="ca">Canada</s-option>
    <s-option value="us">United states</s-option>
    <s-option value="mx">Mexico</s-option>
  </s-option-group>
  <s-option-group label="Europe">
    <s-option value="uk">United kingdom</s-option>
    <s-option value="fr">France</s-option>
    <s-option value="de">Germany</s-option>
    <s-option value="it">Italy</s-option>
  </s-option-group>
  <s-option-group label="Asia pacific">
    <s-option value="au">Australia</s-option>
    <s-option value="jp">Japan</s-option>
    <s-option value="sg">Singapore</s-option>
  </s-option-group>
</s-select>