Re: captcha ???
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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