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

Re: keep CAPTCHA out of HTML5

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 18 Mar 2010 09:17:52 +1100
Message-ID: <2c0e02831003171517h2e6c68a4jd43b05a14217c73e@mail.gmail.com>
To: Matt May <mattmay@adobe.com>
Cc: John Foliot <jfoliot@stanford.edu>, "Gregory J. Rosmaita" <oedipus@hicom.net>, "public-html-a11y@w3.org" <public-html-a11y@w3.org>
On Thu, Mar 18, 2010 at 8:24 AM, Matt May <mattmay@adobe.com> wrote:
> On Mar 17, 2010, at 4:06 PM, Silvia Pfeiffer wrote:
>> Do images get transferred onto braille at all? Could it be done
>> pixel-wise? I'm wondering if there could be a technical solution, even
>> if it doesn't exist yet.
>
> A braille-only user who's blind from birth breaks pretty much every model of multi-sensory CAPTCHA I'm aware of. Even if you could physically lay out a tactile version of a CAPTCHA in a way that the letters were perfectly clear (and CAPTCHAs use colors and visual perturbations to prevent that, because it increase the likelihood of a bot solving it), it'd consist of letterforms that such a user has never seen. They wouldn't be able to decipher the material presented in the image.


So CAPTCHAs really need to introduce another dimension aside from the
visual and the aural - the tactile - and provide a braille CAPTCHA of
some sort. Sounds like a nice research project to me...


Regards,
Silvia.
Received on Wednesday, 17 March 2010 22:18:50 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Friday, 27 April 2012 04:42:03 GMT