<fieldset>
<fieldset disabled>..</fieldset>と書くと、その子らは全てdisabledになる
code:html
<form>
<fieldset>
<legend>Choose your favorite monster</legend>
<input type="radio" id="kraken" name="monster">
<label for="kraken">Kraken</label><br/>
<input type="radio" id="sasquatch" name="monster">
<label for="sasquatch">Sasquatch</label><br/>
<input type="radio" id="mothman" name="monster">
<label for="mothman">Mothman</label>
</fieldset>
</form>