Glossary

The desirable property that operation of a user agent feature is not bound to only one input or output device.

A collection of abstract characters that a format specification allows to appear in an instance of the format.

The user agent's representation of data (e.g., a document). This data generally comes from the document source, but may also be generated (e.g., from style sheets, scripts, or transformations), produced as a result of preferences set within the user agent, or added as the result of a repair performed automatically by the user agent.

The data that the user agent receives as the direct result of a request for a Web resource (e.g., as the result of an HTTP/1.1 [RFC2616] "GET", or as the result of viewing a resource on the local file system). 

Information that supports the use of a user agent.