HTML <optgroup> label Attribute

Example

Two option-groups with labels:

<label for="cars">Choose a car:</label>
<select name="cars" id="cars">
<optgroup label="Swedish Cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
    <option value="mercedes">Mercedes</option>
    <option value="audi">Audi</option>
</optgroup>
</select>

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