6-12.1 Rationale

Web browsers may not have specific plug–ins necessary to view the content format. Users needing to install a plug–in may not have the file permissions needed to complete the installation of the required plug–in.

Plug–ins that provide information that is not essential to the understanding or navigation of the Web content can still be used and do not need an equivalent alternate format or access method.

Provide enough information directly in the Web content or in attribute tags to indicate that the information is not essential.