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Technique G144:Ensuring that the web page contains another CAPTCHA serving the same purpose using a different modality

About this Technique

This technique relates to 1.1.1 Non-text Content (Sufficient, together with G143: Providing a text alternative that describes the purpose of the CAPTCHA).

This technique applies to all technologies.

Techniques are examples of ways to meet Web Content Accessibility Guidelines (WCAG). They are not required to meet WCAG. Content can satisfy the normative requirements of WCAG even if it does not use any of the documented techniques. See About WCAG Techniques.

Description

The purpose of this technique is to reduce occasions in which a user with a disability cannot complete a CAPTCHA task. Because there are alternate CAPTCHA tasks that use different modalities, a user is more likely to be able to complete one of the tasks successfully.

Examples

  • A web page that includes a CAPTCHA test that must be completed successfully before the user can advance to the next step in a process. The page includes both a visual task, such as typing words displayed in a image, and an audio task, such as typing letters spoken in an audio file. A user with hearing disabilities who cannot pass the audio CAPTCHA may be able to pass the visual CAPTCHA.
  • A blog comment form includes a visual CAPTCHA that must be completed before a user can submit comments. In addition to the visual CAPTCHA, it includes a CAPTCHA with a form field that asks, "What is two plus seven?" with a text entry field that allows users to enter the correct answer.

Tests

Procedure

For each CAPTCHA in a web page

  1. Check that the web page contains another CAPTCHA for the same purpose but using a different modality.

Expected Results

  • Check #1 is true.
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