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想要在 optgroup 标签中添加一个 sup-script.. 

<select name="ddlSemester">
    <option selected>--Select--</option>
        <optgroup>"11<sup>th</sup>"</optgroup>
            <option>I Sem</option>
            <option>II Sem</option>
        <optgroup label="11"<sup>th</sup>>
            <option>I Sem</option>
            <option>II Sem</option>
        </optgroup>
</select>
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