Footnote output not valid.

[Waylan Limberg]

I just received a report [1] that the footnote output we use in
Python-Markdown (an exact copy of PHP Markdown Extra [3]) is not valid
HTML [3]. If you notice he's using HTML5. At least the footnote syntax
does valid on XHTML1 or HTML4. Anyway, any suggestions on how the
various footnote implementations want to move forward with this?

[1]: https://github.com/waylan/Python-Markdown/issues/129
[2]: http://michelf.ca/projects/php-markdown/extra/#fn-output
[3]: http://validator.w3.org/check?uri=http%3A%2F%2Fblog.posativ.org%2F2012%2Flinkschleuder-26%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

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Waylan Limberg