docs: function loadCss(url) {
                  if (this.context._cssReady.indexOf(url) === -1) {
                      this.context._cssReady.push(url);
                      var linkRef = document.createElement("link");
                      linkRef.setAttribute("rel", "stylesheet");
                      linkRef.setAttribute("type", "text/css");
                      linkRef.setAttribute("href", url);
                      if (typeof linkRef != "undefined") {
                          document.getElementsByTagName("head")[0].appendChild(linkRef);
                      }
                  }
              }