                  if (xhr.readyState == 4) {

                        if (xhr.status < 400 && xhr.responseText) {
                            code.textContent = xhr.responseText;

                            Prism.highlightElement(code);
                        }
                        else if (xhr.status >= 400) {
                            code.textContent = '✖ Error ' + xhr.status + ' while fetching file: ' + xhr.statusText;
                        }
                        else {
                   