19.1 #Radio.default Default Radio Button

 <div class="sf-radio">
    <input type="radio" class="sf-radio__input" name="navigation" id="radio_1"/>
    <label class="sf-radio__label" for="radio_1">
        <span class="sf-radio__icon"></span>
         <span class="sf-radio__text">Lorem Ipsum is simply dummy text of the printing and typesetting industry.</span>
    </label>
 </div>
 <div class="sf-radio">
    <input type="radio" class="sf-radio__input" name="navigation" id="radio_2" disabled />
    <label class="sf-radio__label" for="radio_2">
        <span class="sf-radio__icon"></span>
         <span class="sf-radio__text">Radio label</span>
    </label>
 </div>
 <div class="sf-radio">
    <input type="radio" class="sf-radio__input" name="navigation" id="radio_3" checked/>
    <label class="sf-radio__label" for="radio_3">
        <span class="sf-radio__icon"></span>
         <span class="sf-radio__text">Radio label</span>
    </label>
 </div>