This article is bad in a lot of ways, but all of sudden it jumps to running Linux in a browser:

“After my failed custom image attempt, I found a promising XFCE-based Debian image on Docker Hub. I downloaded it in minutes and, with a few commands, launched it. When I opened the URL, I was greeted by a fully functional Linux desktop, running right in my browser. The pure geek joy of seeing a complete OS served from inside a Docker container was a feeling I won’t forget. It worked”

And on Windows, docker for Linux containers is just a VM, so this part isn’t really true:

“Containers are not isolated Operating Systems: Docker containers share the host kernel. This is what makes them lightweight and great for single services. Whereas desktop environments expect system services like (systemd, logind, udev, DBus) and device access to be available. Containers don’t provide that by default