anchor.diff:  
     enableOCR = true;
   
  -  machine.imports = [ ./common/x11.nix ];
  +  machine.imports = [ ./common/user-account.nix ./common/x11.nix ];
     machine.virtualisation.memorySize = 2047;
  +  machine.services.xserver.displayManager.auto.user = "alice";
     machine.environment.systemPackages = [ chromiumPkg ];
   
     startupHTML = pkgs.writeText "chromium-startup.html" ''
  
positive.code:       xdoScript = pkgs.writeText "${name}.xdo" text;
      in "${pkgs.xdotool}/bin/xdotool '${xdoScript}'";
    in ''
      sub createNewWin {
        $machine->nest("creating a new Chromium window", sub {
          $machine->execute("${xdo "new-window" ''
            search --onlyvisible --name "startup done"
            windowfocus --sync
            windowactivate --sync
          ''}");
          $machine->execute("${xdo "new-window" ''
            key Ctrl+n
          ''}");
        });
  
negative.code: 
        $machine->screenshot("sandbox_info");
  
        $machine->succeed(ru "${xdo "submit-url" ''
          search --sync --onlyvisible --name "sandbox status"
          windowfocus --sync
        ''}");
        $machine->succeed(ru "${xdo "submit-url" ''
          key --delay 1000 Ctrl+a Ctrl+c
        ''}");
  
        my $clipboard = $machine->succeed(ru "${pkgs.xclip}/bin/xclip -o");
        die "sandbox not working properly: $clipboard"
        unless $clipboard =~ /namespace sandbox.*yes/mi
            && $clipboard =~ /pid namespaces.*yes/mi
  