It would be just "nice-to-have" an XHTML standard compliant output from fossil. And it is not too hard to do. If there is nothing more to do :-)

<hr><i>anonymous claiming to be Ilia Frenkel &lt;ilia@ilia.org.il&gt; added on 2008-12-02 10:21:59:</i><br>
Forgot to mention my name.

<hr><i>anonymous added on 2010-03-03 06:20:52:</i><br>
Related to: <a href="http://www.fossil-scm.org/fossil/info/0049db245e">0049db245ef59671d4fcefd45c02e37a70e2b622  (Firefox HTML Validator thinks all pages are full of errors)</a>

<hr /><i>dmitry added on 2011-09-08 19:34:49 UTC:</i><br />
XHTML is dead, Fossil uses HTML5 doctype, validation errors are tracked in the ticket mentioned above.