7.5.1. Provide an alternative to each CAPTCHA that is either just sound or visual

For each CAPTCHA (anti-spam system) that is either just sound or visual, an alternative must be provided. For example:

  • A sound alternative for a visual CAPTCHA.
  • A visual alternative for a sound CAPTCHA.
  • A text alternative in the form of a simple question for a sound or visual CAPTCHA.
  • Etc.

CAPTCHA systems are designed to block spammers and use increasingly sophisticated methods to obstruct them. CAPTCHAs are therefore more and more difficult to decipher. By definition, a CAPTCHA will therefore never be completely accessible. With respect to accessibility, the best solution is to avoid them.


In this CAPTCHA, the link “Listen” provides the user with a sound version of the CAPTCHA.

notices/graphique-ergonomique/prevoir-pour-chaque-captcha-une-alternative-si-necessaire.txt · Last modified: 20 January 2014 at 12:21 by rlapeze

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