How to run a standalone GUI program without any desktop in Raspberry Pi (Raspbian Lite)?

How to run a standalone GUI program without any desktop in Raspberry Pi (Raspbian Lite)?

1. Install Raspbian Lite into Raspberry Pi
2. Upgrade the Raspbian Lite:
   sudo apt-get install update
3. Install lightdm and xinit
   sudo apt-get install lightdm xinit
4. Depends on whether you need user to login or not, set it in:
   sudo raspi-config > Boot Options > Desktop / CLI
   
5. Now when you reboot, you will see the desktop with Xterm launched.
   　
6.  According to [1], this is why the xterm is launched:
   • /etc/X11/xinitrc
   • which runs . /etc/X11/Xsessions
   • which runs all scripts in /etc/X11/Xsession.d
   • which runs /etc/X11/Xsession.d/99x11-common_start
   • which runs $STARTUP
   • if ~/.xsession is defined, then $STARTUP is ~/.xsession
     　
7. To launch other program, create ~/.xsession, added content like:
   chromium-browser --start-fullscreen
8. In 201x, Google introduces the No Tofu font. To install it:
   sudo apt-get install fonts-noto

     
    [1]: http://xpt.sourceforge.net/techdocs/nix/x/general/xwin03-WinManagerdesktopsChoosing/ar01s04.html