User Agent
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User Agent (UA) is a generic term for the application that is receiving, processing, and presenting the requested file for the user. In the case of SVG, the UA might be a Web browser with native SVG support (such as Opera or Firefox), a browser plugin (such as ASV), or some other application (such as a text-to-speech screen-reader).
It is common for a User Agent to be referred to as an "implementation," meaning a working program that is based on the given Specification (in this case, W3C's SVG Spec). It is often important to know which version of the Spec is supported, and to what degree, as different UAs will have different capabilites and features.
See also Cross-Platform Authoring.
