You question is still a little ambiguous (to me anyway).

Given the html

<h3>Some heading.</h3><p>Some <i>controvesial</i> but <b>important</b>
+ text and a list</p><ol><li>This</li><li>That</li><li>and the other</
+li></ol>
[download]

Do you want to see

<h3>Some heading.</h3>
<p>Some <i>controvesial</i> but <b>important</b> text and a list</p>
<ol>
    <li>This</li>
    <li>That</li>
    <li>and the other</li>
</ol>
[download]

or

Some heading.

Some controvesial but important text and a list

1. This
2. That
3. and the other

Ie. Do you want to see formatted html or text formatted using html?

The former would be fairly easy, the latter much harder depending upon how any tag types you wish to support? How about CSS? Jscript etc. etc.?