docs: function goDoc() {
    _traverseDOM(document);
    // add standard footer
    var ftr = document.createElement("div");
    ftr.className = "footer";
    var msg = "Copyright &copy; 1998-2015 by Northwoods Software Corporation.";
    if (go && go.version) {
      msg = "GoJS&reg; version " + go.version + ". " + msg;
    }
    ftr.innerHTML = msg;
    document.body.appendChild(ftr);
  }