Simple Question: Backwards Lists

Is there any way using XHTML 1.1 and CSS1/2/3 that you can get an <ol>
to number in reverse order? e.g.:-

     5. List item
     4. List item
     3. List item
     2. List item
     1. List item

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Kindest Regards,
Sean B. Palmer
@prefix : <http://webns.net/roughterms/> .
:Sean :hasHomepage <http://purl.org/net/sbp/> .