IE removed node retains parent node

Hi all,

I recently discovered that in IE, when I remove a node from the document
via removeChild, the removed node retains a parentNode, but the
parentNode has no tagName and it has no parentNode. Here's something to
illustrate my point:

<div id="d1"></div>;

<script type=";text/javascript";>

div1 = document.getElementById('d1');

div1.parentNode.removeChild(div1);

alert(div1.parentNode);
alert(div1.parentNode.tagName);
alert(div1.parentNode.parentNode);

&lt;/script&gt;

FF behaves differently (as do other browsers I've tested). I haven't
been able to find any documentation explaining this behavior or any
explanation for it. Does anyone here know where I might find more
information about this?

Thanks,
mata_goliat

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