Here is how to make chromium kiosk without Desktop Environment (to save loading time and resources)
In my case chromium-browser not loaded in fullscreen by default, its position 65 pixel from top, so i need to add parameter “–window-size” and “–window-position” to make it right. In case its still not right, uncomment xdotool lines
save the text below in file ~/.xsession
#!/usr/bin/env bash
xset s off -dpms &
#exec matchbox-window-manager &
while true; do
sed -i 's/"exited_cleanly":false/"exited_cleanly":true/' ~/.config/chromium/Default/Preferences
sed -i 's/"exit_type": "Crashed"/"exit_type": "Normal"/' ~/.config/chromium/Default/Preferences
#in case chromium window size not fullscreen
#/usr/bin/xdotool sleep 60 getwindowfocus windowsize 800 480&
#/usr/bin/xdotool sleep 60 getwindowfocus windowmove 0 0&
/usr/bin/chromium-browser --no-default-browser-check --noerrdialogs --window-position=0,0 --window-size=800,480 --kiosk http://the-web-you-want-to-load
done