code: function () {
              var placeholderOption;
              return this.opts.element.attr("placeholder") ||
                  this.opts.element.attr("data-placeholder") || // jquery 1.4 compat
                  this.opts.element.data("placeholder") ||
                  this.opts.placeholder ||
                  ((placeholderOption = this.getPlaceholderOption()) !== undefined ? placeholderOption.text() : undefined);
          }
docs: abstract