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Not sure if this is the right way to file a bug for the spec, but in this paragraph of section 6 of http://www.w3.org/TR/html-templates/, the word "hierarhcy" is a typographical error. Non-normative note: It is recommended that user agents implementing the template element prevent DOM hierarhcy cycles, including those which contain a reference (graph edge) from template element to the templates document fragment. When such a cycle would be created, it is recommended that the user agent throw a HierarchyRequestError. (section.mechanics p:nth-child(7) em)
*** This bug has been marked as a duplicate of bug 23409 ***