Some basic html that the twiki converter handles

<b>bold</b>

<i>italics</i>

<h2>headers</h2>

<code>monospace</code>

<em>emphasis</em>

Breaks<br/>Here
and using<p>Paragraph syntax</p>

<blockquote>quotes
as a block
of text
</blockquote>

<a href="http://www.google.com">Alias</a>