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Providing text alternatives allows the information to be rendered in a variety of ways by a variety of user agents.

For example, a person who cannot see a picture can have the text alternative read aloud using synthesized speech.

This would create barriers for a great many more users with disabilities.

For this reason the Working Group has chosen to structure the requirement about CAPTCHA in a way that meets the needs of most people with disabilities, yet is also considered adoptable by sites.

Sometimes a test or exercise must be partially or completely presented in non-text format.

Audio or visual information is provided that cannot be changed to text because the test or exercise must be conducted using that sense.

Organizations motivated to conform to WCAG should be aware of the importance of this topic and should go as far beyond the minimum requirements of the guidelines as possible.

However, they are widely used, and the Web Content Accessibility Guidelines Working Group believes that if CAPTCHAs were forbidden outright, Web sites would choose not to conform to WCAG rather than abandon CAPTCHA.

Sometimes there are non-text exercises that are used to prove you are human.

To avoid spam robots and other software from gaining access to a site a device called a CAPTCHA is used.

Sometimes content is primarily intended to create a specific sensory experience that words cannot fully capture.

Examples include a symphony performance, works of visual art etc.

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