        <label for="example1Yes">Yes</label>
              <input required type="checkbox" name="example1" value="no" id="example1No" />
              <label for="example1No">No</label>
            </fieldset>
            <button class="button" type="submit">Submit</button>
            <button class="button" type="reset">Reset</button>
          </form>

          <hr>

          <p>This form has <strong>one</strong> required checkbox.  If you try to submit without picking one, it
          should show an e