HTML Debes dar al primer elemento label contenido de texto. <ul class="answers-list"> <li> <label for="q1-a1"> <input type="radio" id="q1-a1" " value= “Este es el uno” /> </label> </li> <li> <label for="q1-a2"> <input type="radio" id="q1-a2" " value= “Este es el dos” /> </label> </li> </ul> </fieldset> </div> <div class="question-block"> <p>2</p> <fieldset class="question" name="html-question-two"> <legend> A label element nesting an input element is required to have a for attribute with the same value as the input's id </legend> <ul class="answers-list"> <li> <label for="q2-a1"> <input type="radio" id="q2-a1" " value= “Este es el tres” /> </label> </li> <li> <label for="q2-a2"> <input type="radio" id="q2-a2" " value= “Este es el cuatro”/> </label> </li> </ul>

<fieldset class="question" name="html-question-two">
              <legend>
                A label element nesting an input element is required to have a
                for attribute with the same value as the input's id
              </legend>

              <ul class="answers-list">
                <li>
                  <label for="q2-a1">
                    <input type="radio" id="q2-a1" " value= “Este es el uno” />
                  </label>
                </li>
                <li>
                  <label for="q2-a2">
                    <input type="radio" id="q2-a2" " value= “Este es el dos” />
                  </label>
                </li>
              </ul>
            </fieldset>
          </div>
          <div class="question-block">
            <p>3</p>
            <fieldset class="question" name="html-question-three">
              <legend>
                Each input element must have a name attribute