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About

optgroup is an HTML element that group options within a select element.

Example

<label for="country">Choose a country:</label>
<select id="country">
    <optgroup label="Europa">
        <option>England</option>
        <option>Germany</option>
        <option>Netherland</option>
    </optgroup>
    <optgroup label="Africa">
        <option>Marroco</option>
        <option>Algeria</option>
        <option>Tunisia</option>
    </optgroup>
</select>
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