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Node ha an attribute called nodeType and it works as a type tag. we need an unique nodeType value for ShadowRoot. http://www.w3.org/TR/domcore/#node
See also bug 15516. Why is DOCUMENT_FRAGMENT_NODE not good?
Oops, I mean see also bug 15421.
Ah, I missed it. Closing. *** This bug has been marked as a duplicate of bug 15421 ***