CSS2 vs XHTML1

This URL produces an error message for your CSS2 test, while being
wellformed and valid for your XHTML test. Could you please explain
in detail the necessary corrections? Thank you.

http://jigsaw.w3.org/css-validator/validator?uri=http://www.dcs.qmul.ac.uk/~sb/First-Aid/index.html

>org.xml.sax.SAXException: Please, fix your system identifier (URI)
>in the DOCTYPE rule.

Received on Tuesday, 11 December 2001 22:51:14 UTC