Recently, I entered the service (I think it’s Google or Facebook, but I'm not sure) and a ticket in the field to remember my device.
Then the site warned me that this is unlikely to work, because I worked in private mode. That was right.
Now I can’t reproduce this, because I don’t remember exactly where he was, and the usual login does not create this message (moreover).
However, today I had a discussion with a friend, whether it is possible to find out if the device is configured in closed mode.
I am aware of several "super cookie" methods that may cover the private mode of some browsers, but I do not want to know about this. I'm interested in environmental information that can be read and interpreted, and provide information on whether private mode is active or likely .
To clarify the meaning of my question, I will give one example that could be used to solve this problem:
There is a so-called "CSS story". I do not know about the current state in browsers, however for a long time it was quite often and worked like this:
Put a link to another website (e.g. http://www.google.com on the website), then you can read the state of the visited state of the css state using javscript.
Now, if you do this with a popular site like google, you can say:
Well, have you never seen google.com? This is unlikely, so I’ll assume that you just opened a private viewport!
So there are other methods, and so what, and is there a way to combine them in such a way as to evaluate whether the user is currently in private mode or not?