DefaultSettings.php from MediaWiki 1.3.9:
# Allow limited user-specified HTML in wiki pages?
# It will be run through a whitelist for security.
# Set this to false if you want wiki pages to consist only of wiki
# markup. Note that replacements do not yet exist for all HTML
# constructs.
$wgUserHtml = true;
Where is this whitelist?
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NSK
http://portal.wikinerds.org