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Re: captcha ???
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Re: captcha ???


  • Subject: Re: captcha ???
  • From: Xavier Destombes <email@hidden>
  • Date: Fri, 5 Dec 2008 08:23:49 +0100

You can also do an accessible captcha that would work with screen readers and so on.
What we are using is a captcha that request the total of a simple calculation like " 3 + 4" or "10 - 3".
No javascript, only plain standard technologies;)
Maybe an ERXAccessibleSpamCheck for Mike:)


Xavier

That is a good point. Ajax is another area that serious affects accessibility. I have not seen much information on how to handle that, other than to have a parallel, non-Ajax accessible page / site.

The main difficulty for screen readers on Ajax enabled sites is that the screen reader reads the page in to a virtual buffer when the page loads, and therefore doesn't detect changes to the page unless the whole page is reloaded.


JAWS, the commercial screen reader from Freedom Scientific and NVDA, an open source screen reader for Windows have some support for Aria live regions, but Ajax isn't fully supported by any screen reader on the Mac or Windows at this time.

A similar situation was encountered with the introduction of Flash, and it took some time for screen reader vendors to implement a solution. I am sure Ajax support will improve in the major screen readers as demand for it grows.

Some of the material on Aria is worth a read if this subject interests you, http://www.travisroth.com/2008/09/04/aria-resources/

Cheers,

Mitch

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References: 
 >captcha ??? (From: Owen McKerrow <email@hidden>)
 >Re: captcha ??? (From: "Mitchell Smith" <email@hidden>)
 >Re: captcha ??? (From: Chuck Hill <email@hidden>)
 >Re: captcha ??? (From: "Mitchell Smith" <email@hidden>)

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