anchor.diff:    // refresh [download]
     //-----------------------------------------
   
  -  var refreshDownloadButton = function() {
  -    var button = $('#download-button');
  -    cd.setTip(button, function() {
  -      var tip = 'download files from ' + param.avatar + ' ' + param.nowTag;
  +  const refreshDownloadButton = () => {
  +    const button = $('#download-button');
  +    cd.setTip(button, () => {
  +      const tip = 'download files from ' + param.avatar + ' ' + param.nowTag;
         cd.showHoverTip(button, tip);
       });
     };
   
  -  var doDownload = function() {
  -    var params = {
  -          id: param.id,
  -      avatar: param.avatar,
  -         tag: param.nowTag
  -    };
  -    var url = '/download_tag/' + params.id + '/' + param.avatar + '/' + param.nowTag;
  +  const doDownload = () => {
  +    const url = '/download_tag/' + param.id + '/' + param.avatar + '/' + param.nowTag;
       window.location = url;
     };
   
     // - - - - - - - - - - - - - - - - - - - - - - - -
   
  -  var deleteAllCurrentFiles = function() {
  -    $.each(cd.filenames(), function(_, filename) {
  +  const deleteAllCurrentFiles = () => {
  +    $.each(cd.filenames(), (_, filename) => {
         if (filename !== 'output') {
           cd.deleteFile(filename);
         }
  
positive.code: 
    // - - - - - - - - - - - - - - - - - - - - - - - -
  
    var setupButton = function(name, handler) {
      $('#'+name+'-button-container').html('<button id="'+name+'-button" type="button"></button>');
      $('#'+name+'-button')
        .text(name)
  
negative.code: 
    // - - - - - - - - - - - - - - - - - - - - - - - -
  
    const forkFailedDialog = (reason) => {
      const message =
        'Failed: On the originating server, ' + reason + ' does not exist';
      $('<div>')
      .html(message)
  