Sorry for the disturbing subject

I noticed that some guy pull this off to set an image of Windows 95 to run on a browser.
http://win95.ajf.me/So I was trying to find out if the same can apply for OS/2, but I noticed that this is based on "Em-DOSBox" which is a javascript implementation of DOSBox. I always thought that Windows 95 was a not an OS that runs over DOS like used to be Win 3.1, but I'm not sure if I'm wrong now (I was never an expert on Windows 95 architecture).
What do you think? Can OS/2 be run on a browser just like Windows 95? or this only runs DOS and Windows 95 runs over it.
Regards.