code: function(attr) {
        var html = this._escapedAttributes[attr];
        if (html) {
          return html;
        }
        var val = this.attributes[attr];
        var escaped;
        if (Parse._isNullOrUndefined(val)) {
          escaped = '';
        } else {
          escaped = _.escape(val.toString());
        }
        this._escapedAttributes[attr] = escaped;
        return escaped;
      }
docs: Gets the HTML-escaped value of an attribute.