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http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#dfn-parent-calculation-algorithm Shouldn't step 2 be "otherwise if"?
It looks like this has been fixed in this revision: <http://dvcs.w3.org/hg/webcomponents/diff/4db7e315afb5/spec/shadow/index.html>