MSCIS | Systems Analyst – Sakai & IS Academic Systems | Albany Medical Center | 518-264-1055
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Not commenting on the validation issue here, but you don’t need to set
a Content-Style-Type. This is well covered by content sniffing 
(wondering aloud, though not spec’ed out in MIME Sniffing  yet?),
and there is de facto only one style language on the Web.
>> Isn't the applicable part of the spec the new definition of the style
>> attribute, which is now defined to use CSS instead of the document's
> Not sure because Content-Style-Type would also relate to <link> and
> <style>. If I don’t get this wrong here. This is possibly defined in
> several places. :)
In HTML 4, the type attribute was mandatory on those elements, so the
default style language would never be applicable there.