W3C home > Mailing lists > Public > public-html-a11y@w3.org > March 2010

RE: keep CAPTCHA out of HTML5

From: John Foliot <jfoliot@stanford.edu>
Date: Wed, 17 Mar 2010 13:58:52 -0700 (PDT)
To: "'Silvia Pfeiffer'" <silviapfeiffer1@gmail.com>, "'Gregory J. Rosmaita'" <oedipus@hicom.net>
Cc: <public-html-a11y@w3.org>
Message-ID: <02c301cac614$a6008d20$f201a760$@edu>
Silvia Pfeiffer
> Is there no way at all to transfer a CAPTCHA onto a braille device?
> Just curious.

Hi Silvia,

No, as it then would also be accessible to bots, etc.  The whole point is
that CAPTCHAs (visual or audio) are actually testing for physical ability
rather than cognition - you can see something or hear something, actions
that machines can replicate but not accurately process - thus, the logic
goes, you are human and not machine. 

But if a disabled user requires a machine to interact with technology
(i.e. Adaptive Technology), then the very task that CAPTCHAs have been
created to do (frustrate machine processing) impacts the user *reliant* on
machine processing. (And we won't get into the whole issue of some
people's belief in OCR to save the world, or speech-to-text for
captioning, because if these technologies did actually work with 100%
accuracy, they would completely negate the 'security' around CAPTCHAs)

There is no such thing, nor will there ever be, a totally accessible
CAPTCHA, as by definition the two are mutually exclusive.


Received on Wednesday, 17 March 2010 20:59:26 UTC

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