Can vimwiki don't convert the raw html

[GoogleCodeExporter]

Some reason I want write some raw html in the wiki file, like:
<div>
    <pre>
      <span>hi</span>
      <span>hi</span>
    </pre>
</div>

And I has already set g:vimwiki_valid_html_tags="div,pre,span",
I run :Vimwiki2HTML to convert the wiki file to html file, and I want to get 
the same html in the wiki file, but I got this:

<p>
<div>
</p>
<blockquote>
<pre>
<span> hi</span>
<span> hi</span>
<span> hi</span>
<span> hi</span>
</pre>
</blockquote>
<p>
</div>
</p>


I'm use Vimwiki 2.1 and vim 7.4 , the os is  ArchLinux

Original issue reported on code.google.com by ColdNight.Linux on 27 Dec 2013 at 9:41