I don't know about "very well," but I'd give this site a C or D for functionality and an A or B overall. I agree that it's a fantastic resource, and even if I were to get booted, I'd probably come back in the future under a different name just to repay the Perl community for all the help they have given me. (I wonder how many monks will take that the wrong way).
The W3 validator is often wrong and not always helpful in finding problems, but some people like to create completely valid HTML anyway. I'm not one of those people, but Perl programmers who promote use strict seem more likely to be.