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A NodeIterator rooted at some element cannot produce an element before
that root. That is, in a DOM tree such as:
<div id=one><div id=two><div id=three></div></div></div>
If we create a NodeIterator rooted at element `three`, then invoking the
previousNode() method on that iterator is guaranteed to return null.
There was also a bug here where if we ever did enter the while() loop,
we would have looped indefinitely, as we were not updating the current
node.
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| RequestServer | ||
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