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=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">&lt;!-- a longer piece of HTML --&gt;</span>
    <span class="h-ab">&lt;</span><span class="h-tag">p</span><span class="h-ab">&gt;</span>First paragraph<span class="h-ab">&lt;/</span><span class="h-tag">p</span><span class="h-ab">&gt;</span>

    <span class="h-ab">&lt;</span><span class="h-tag">p</span><span class="h-ab">&gt;</span>another para<span class="h-ab">&lt;/</span><span class="h-tag">p</span><span class="h-ab">&gt;</span>

    <span class="h-ab">&lt;</span><span class="h-tag">p</span><span class="h-ab">&gt;</span>End<span class="h-ab">&lt;/</span><span class="h-tag">p</span><span class="h-ab">&gt;</span></pre>
</body></html>
__RESULT__
-html
<html><body bgcolor="#ffffff">
<pre>    &lt;!-- a longer piece of HTML --&gt;
    &lt;p&gt;First paragraph&lt;/p&gt;

    &lt;p&gt;another para&lt;/p&gt;

    &lt;p&gt;End&lt;/p&gt;</pre>
</body></html>