[Haskell wikibook] Using XHTML Elements in the Wikibook

[PR Stanley]

Hello again
One of you chaps once told me that XHTML elements had no place in the 
Wikibook: the rationale being that everyone, regardless of his 
knowledge of mark-up languages, should be encouraged to contribute to 
the wiki text.
I'm wondering if a small amount of HTML tagging may not be such a bad 
idea considering the accessibility benefits.
What does the list think?
Cheers,
Paul