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«Negative captchas create a form that has tasks that only bots can perform, but humans cannot. This has the exact same effect, with (anecdotally) a much lower false positive identification rate when compared with positive captchas» https://github.com/subwindow/negative-captcha
<div style="position: absolute; left: -2000px;"><input type="text" name="name" value="" /></div> — ain't this nice? ‎- 9000
Оригинально! ‎- гавс