yuumei

  github.com##.code-navigation-cursor
  github.com###symbols-pane:upward(1)

  keycodes = [191, 17, 32] 
  document.addEventListener('keydown', function(e) {
      if (keycodes.indexOf(e.keyCode) != -1)
      {
          e.cancelBubble = true;
          e.stopImmediatePropagation();
      }
      return false;
  });