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http://dev.w3.org/csswg/cssom-view/#dom-document-elementsfrompoint [[ If there is no element at the given position the method must return a sequence containing the root element ]] It would make more sense to include the root element even if there is an element at the given position.
https://dvcs.w3.org/hg/csswg/diff/655c8af66581/cssom-view/Overview.src.html