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Shadow DOM specification reads "The UIEvent relatedTarget attribute must return the adjusted related target". This is a typo. Only MouseEvents have relatedTarget property
Shadow DOM spec containing this text https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#events-that-are-always-stopped
http://dvcs.w3.org/hg/webcomponents/rev/f332097616f9