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In Shadow DOM specification (https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#shadow-root-object) the following methods of Shadow rot object are listed: NodeList getElementsByClassName(DOMString tagName); NodeList getElementsByTagName(DOMString className); Argument name of getElementsByClassName() is tagName and argument name of getElementsByTagName() is className. Should be vice versa.
Fixed at https://dvcs.w3.org/hg/webcomponents/rev/f2908f2808a9