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POIs it possible to evaluate whether the clients browser is in incognito mode?
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  1. POIs it possible to evaluate whether the clients browser is in incognito mode?
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    copied!<p>Lately I was logging into a service (I think it was Google or Facebook but I am not sure) and ticket the box to remember my device.</p> <p>Then the Site alerted me that this was unlikely to work because I was running in private mode. Which was correct.</p> <p>I am now unable to reproduce this since I don't remember exactly where it was and a normal login appears not to produce that message (any more).</p> <p>However Today I had a discussion with a friend whether It is possible to recognise if a device is configured in private mode.</p> <p>I am aware of several "super cookie" methods that are able to reach across the private mode of some browsers, but I do not want to know about those. I am interested in environment information that can be read and interpreted and give information whether private mode is active or is <strong>likely</strong> active.</p> <p>To clearify the meaning of my question I give one example that could be used to solve that problem:</p> <p>There is a so called "CSS History" hack. I do not know about the current state in browsers, however for a long time it was pretty common and worked like this:</p> <p>Put a link to another website (for example <code>http://www.google.com</code> on a website), then you will be able to read the <code>visited</code> state css state of the link using javscript.</p> <p>Now if you do that with a popular site like google, you could say: </p> <blockquote> <p>Well, you never visisted google.com? Thats unlikely so I will assume you just opened a private browsing window!</p> </blockquote> <p>So are there other methods, and which, and is there a way to combine them in a way that allows to give an estimate whether the user is currently in private mode or not?</p>
 

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