docs: function (elements, legend) {
              var elements = elements || [];
              for (var i = 0; i < elements.length; i++) {
                  if (elements[i].classList.contains(this.stylings.error) === false)
                      elements[i].classList.add(this.stylings.error);
                  var legend = elements[i].getAttribute("data-label") || legend;
                  var parent = elements[i].parentNode;
                  parent.setAttribute("data-hint", legend);
                  if (i === 0)
                      elements[i].focus();
              }
          }