html: fieldset and legend markup

fieldset.html

<fieldset>
    <legend>Billing Affress</legend>
    <label for="billAddress">Address</label><input type="text" id="billAddress" name="billAddress" />
    <label for="billCity">City</label><input type="text" id="billCity" name="billCity" />
    <label for="billProvince">Province</label><input type="text" id="billProvince" name="billProvince" />
    <label for="billPC" >Postal Code</label><input type="text" id="billPC" name="billPC" />
</fieldset>