That's an argument that the extensions are the same (not "standard")
across the same version of a browser, not all versions of it. If you
wanted to do content negotiation re user-agent, you have to keep track
of the Windows, the Unix(es), the Mac versions of each release. They
may well not work the same despite the common number.
Of course if those extensions were described in SGML, you could use
the document type declaration or even the internal subset as the
basis for negotiation---on a per-document basis, though.
--
Terry Allen (terry@songline.com), Online Books Editor, Songline Studios
affiliated with O'Reilly & Associates, Inc.
A Davenport Group sponsor. See http://www.ora.com/davenport/README.html
Footballisms: "That's the kind of self-destruction you can't
afford to have."