=begin filter html
<!-- a longer piece of HTML -->
<p>First paragraph</p>
<p>another para</p>
<p>End</p>
=end filter
__RESULT__
+html
<html><body bgcolor="#ffffff">
<pre> <span class="h-com"><!-- a longer piece of HTML --></span>
<span class="h-ab"><</span><span class="h-tag">p</span><span class="h-ab">></span>First paragraph<span class="h-ab"></</span><span class="h-tag">p</span><span class="h-ab">></span>
<span class="h-ab"><</span><span class="h-tag">p</span><span class="h-ab">></span>another para<span class="h-ab"></</span><span class="h-tag">p</span><span class="h-ab">></span>
<span class="h-ab"><</span><span class="h-tag">p</span><span class="h-ab">></span>End<span class="h-ab"></</span><span class="h-tag">p</span><span class="h-ab">></span></pre>
</body></html>
__RESULT__
-html
<html><body bgcolor="#ffffff">
<pre> <!-- a longer piece of HTML -->
<p>First paragraph</p>
<p>another para</p>
<p>End</p></pre>
</body></html>