I don't know much about coding but I was wondering if it could be done.
Or resize their browser window.
Or 100 other things.
How probable is it that you would have a user who is capable of doing that? Them being able to ununique themselves would tell you a lot about them.
I have seen that even with resizing windows to the standard some people don't ununique themselves.
Which tells you the user can TOR or that they work for a big corp. It would stop the casuals. You can't stop that 4chan hackerman, lol.
Theoretically. But what if they use a non-unique browser?