What makes illegal characters non-conformant

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validator.nu finds an error in 

  http://www.ltg.ed.ac.uk/~ht/char_alias.html

I don't think I have a problem with that, I can imagine an argument
that it's broken (although http://www.ltg.ed.ac.uk/~ht/char_alias.xml
is _not_ broken per the XML specification. . .), but I can't find
anywhere in the HTML5 spec. which says so.  Does it/should it?

ht
- -- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
                         Half-time member of W3C Team
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 651-1426, e-mail: ht@inf.ed.ac.uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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Received on Wednesday, 23 September 2009 14:13:33 UTC