<h3 id="do-not-expose-use-of-assistive-tech">Don't reveal that assistive technologies are being used</h3>

Make sure that your API doesn't provide a way

for authors to detect that a user is using assistive technology

without the user's consent.

for authors to detect that a user is using assistive technology.

[The web platform must be accessible to people with disabilities.](https://www.w3.org/2001/tag/doc/ethical-web-principles/#allpeople)

If a site can detect that a user is using an assistive technology,

People who make use of assistive technologies

are often [vulnerable members of society](https://www.w3.org/2001/tag/doc/ethical-web-principles/#noharm);

their use of assistive technologies is [sensitive information](https://www.w3.org/TR/security-privacy-questionnaire/#sensitive-data) about them.

If an API provides access to this information

without the user's [consent](#consent),

If an API provides access to this information,

this sensitive information may be revealed to others

(including [state actors](https://www.w3.org/2001/tag/doc/ethical-web-principles/#expression))

who may wish them harm.