TWiki formatting rules (http://twiki.org/cgi-bin/view/TWiki/TextFormattingRules) state that html tags may be included in a Twiki Page. In some cases, this is required to achieve certain effects. See the description of Verbatim Mode, where it says that <pre>...</pre> should be used in certain cases. However, when running the mvn site on .twiki files, all "<" and ">" are replaced by "<" and "> Steps to reproduce: Create a maven site project. Add a .twiki file with the following content: ---+ Twiki test <pre> Hello Hello </pre> After the site has been generated, no <pre> tags will exist instead the following will be shown: <pre>Hello Hello</pre>