I would like to find an interaction in Javascript that only a human can do, but javascript can track it if the user has done it.
Something like an only readable event but not writable.
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What's the problem you're trying to solve? In some devices the `orientationChange` event read-only, if that helps? – David Thomas Sep 18 '12 at 17:17
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That's what a captcha is for. :) – Korvin Szanto Sep 18 '12 at 17:17
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Are you somehow trying to prevent selenium driver or some related technology? This would not prevent user scripts, nor crawlers, although you could make their lives more difficult. – penguat Sep 18 '12 at 17:18
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You could use mouse-driven CSS pseudoclasses; I don't believe they can be triggered using Javascript: see Trigger css hover with JS for a little more information.
If you set some style aspect on the hover, for example, you might be able to detect that using javascript.
I don't know how well this approach would work cross-browser however, and you might need to use a visible element.
see also Activate an element's :active CSS pseudo-class using Javascript?
