Hello,
The forums can use the GeSHi syntax highlighter for code blocks, but this is not documented here or in the FAQs if i'm not mistaken.
Here is what i found which works:
<code type="some_language"> Your code here </code>
Python and CSS work, but HTML doesn't (or i didn't find the right keyword). It would be nice to have a list of supported/activated filters. ;)
My guess is that this implementation is actually Drupal's GeSHi Filter module:
http://drupal.org/project/geshifilter
For HTML, and some other pieces of code, you still have to replace instances of < and > (and possibly &) with <, > and &.
Have a look at this. You are right, it does use Geshi.
<html> <head></head> <body></body> </html>My bad, i missed that page. And the link to it is quite obvious, too. Geez.