Techniques for WCAG 2.0

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# G144: Ensuring that the Web Page contains another CAPTCHA serving the same purpose using a different modality

## Applicability

Applies to all technologies.

This technique relates to:

- Success Criterion 1.1.1 (Non-text Content)
  - How to Meet 1.1.1 (Non-text Content)
  - Understanding Success Criterion 1.1.1 (Non-text Content)

## 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 video 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.

## Related Techniques

- G143: Providing a text alternative that describes the purpose of the CAPTCHA

## 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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