4 ms·

That's a great idea. If i was ever to create a product for colorblinds only i'd use that.

• ihsw 14y ago
  It's not an uncommon strategy (eg: fill up a comment form with hidden but obviously named form fields) and since people won't be filling in those hidden fields then bots will have revealed themselves. This isn't by any means a complete solution however it does catch 90% of drive-by spam.
  • philipDS 14y ago
    Yup, this is also known as the Honeypot Captcha technique: http://haacked.com/archive/2007/09/11/honeypot-captcha.aspx http://haacked.com/archive/2007/09/11/honeypot-captcha.aspx
  • dEnigma 14y ago
    That's an interesting approach, but I guess as soon as it would become mainstream, the bots would adapt without many problems.
    • NickNameNick 14y ago
      Depending on how the fields were hidden, they may need to render and reflow html, css and dom changes by javascript. None of which is all that difficult for a full size browser, but it may be prohibitively resource intensive for a high-volume spam bot.
      • Bromskloss 14y ago
        Lynx. :-(
  • eli 14y ago
    Careful! There are legitimate toolbars that will helpfully prefill forms, sometimes even hidden fields. I've been bitten by this in production.