7.14. Provide an alternative to each CAPTCHA that is only a sound or only a visual test

For each CAPTCHA (anti-spam system) that is only a sound or only a visual test, an alternative must be provided.

For example:

Note

For each CAPTCHA, provide a method for reloading the content, because it is often difficult for users to understand it the first time it appears.

In this CAPTCHA, the link “Listen” provides the user with a sound version of the CAPTCHA while the link “Reload” provides a new image if this one is difficult to read.

Tip

Good practice is to provide, in addition to the reload solution, information on how to contact the website manager, if the CAPTCHA cannot be typed in (a link to the “Contact” page, a phone number, etc.).

Warning

CAPTCHAs are designed to block spambots that use more and more sophisticated techniques to circumvent them.

This means that it is increasingly difficult for users to decipher them. By definition, a CAPTCHA will never be fully accessible, so the best solution to ensure accessibility is to do without it or to prefer security tests presented as logical tests.

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