old_contents: /* global Calendar, vis */
  
  (function() {
      "use strict";
  
      var calendar = new Calendar();
      calendar.init(document.getElementById('visualization'),{});
  
  })();
new_contents: /* global Calendar, vis */
  
  (function() {
      "use strict";
  
      var calendar = new Calendar();
      calendar.init(document.getElementById('visualization'),
      {
        height: "100vh", 
        orientation: "top",
        zoomKey: 'shiftKey'
      });
  
  })();
subject: Add scrollKey