HTML restriction

The MediaWiki software restricts the use of HTML by default. Only some HTML elements and attributes are allowed. Raw-HTML sections, surrounded by the "html" tag, can be enabled with the option $wgRawHtml. The code is available at http://cvs.sourceforge.net/viewcvs.py/wikipedia/phase3/includes/Sanitizer.php?view=markup.

The Wikimedia Foundation's website allows full use of HTML. Their other websites (see Complete list of Wikimedia projects) do not.