select-nested.html

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<!doctype html>

<meta name="viewport" content="width=device-width, initial-scale=1.0" />

<select id="nested">

  <div>

    <option>ABC</option>

    <div>

      <option>DEF</option>

    </div>

    <optgroup label="GROUP">

      <div>

        <option>GHI</option>

      </div>

    </optgroup>

  </div>

</select>