Garbage collection question on Mozilla DOM

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Message-ID <b3e04e20-e6da-44df-970a-3d5fbb6be4ba@i72g2000hsd.googlegroups.com> 
I have a quick question regarding 1.9 garbage collection behavior on
the DOM nodes. If I disconnect the top node of a subtree, will the
whole subtree be garbage collected or do I have to disconnect each of
the nodes in the subtree? Thanks.
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