Pertains to Mollom service, not the module but am entering as a resubmission with hopefully better title as suggested by http://drupal.org/node/744264#comment-3235510 re 7.x version. Includes several issues still outstanding re usability for non-keyboard users. We originally reported re 6.x-2.0-beta2, retesting on 6.x-2.0-beta2. Reported also via Mollom ticket link since all problems also relevant to Mollom service as implemented on mollom.com.
3+ issues regarding accessibility of audio captcha button:
1) dependency on Flash
2) accessibility of audio button
3) instructions for what to enter re audio captcha (minor issue)
Note as the Drupal developer of daisy.org, I am sighted. Until recently I would not enable Mollom or captcha since I personally could not understand the audio, now improved. Recently due to changes needed re security I decided to implement captcha on our Drupal registration form and asked our staff to test and received the feedback below. I personally think that an instruction to just enter the first letter of each word could be added - (I was confused & see this noted elsewhere http://drupal.org/node/768694).
Additionally I will note that even though the issue below might be able to be fixed even while retaining use of Flash for the audio button, vision-impaired users often disable Flash. Currently the Firefox Flash plug-in on one of my machines is not working and the button does not appear at all for me. Is Flash really necessary to implement the button to play the generated mp3?
From one of our technical support staff who is blind:
I just tested the registration form. The audio in the CAPTCHA is OK but I could not play it using the keyboard. The button which needs to be clicked to play the audio has a very strange label “mollom-captcha-player.swf?url=http%3a%2f%2f126.96.36.199%3a80%2fv1%2fcaptcha%2f120131d97eaf8191ca.mp3 Button”
And pressing spacebar or Enter does not activate this button. Further, when the button is activated the focus should jump to the edit field where captcha text is to be typed. This is also not happening currently.