Running LXDE inside Xephyr in Arch Linux

Install Xephyr:

sudo pacman -S xorg-server-xephyr

Install LXDE:

sudo pacman -S lxsession-gtk3 lxpanel-gtk3 pacmanfm-gtk3 openbox lxtask-gtk3 lxde-icon-theme lxterminal-gtk3 lxrandr-gtk3

Then run Xephyr:

Xephyr -ac -noreset -query localhost -screen 1920x1080 -keybd ephyr,,,xkbmodel=evdev :3

And in another terminal:

DISPLAY=:3 startlxde