reference [MIMETYPES]

type = content-type [CI]
When present, this attribute specifies the content type of a piece of content,
for example, the result of dereferencing a URI. Content types are defined in
[MIMETYPES].

But Content types are not 'defined' in [MIMETYPES], they're listed there.

The wording in section 6.7 is better.

Note that the examples "text/tcl", "text/javascript" and "text/vbscript"
used here are not registered and would be best removed from the set of
examples.

# Note. The content type "text/css", while not currently registered
# with IANA, should be used when the linked resource is a [CSS1] style sheet.

text/css *is* registered, as per RFC 2318.

Larry
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http://www.parc.xerox.com/masinter