[Bug 21976] New: [imports]: Preventing DOM hierarchy cycles

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21976

            Bug ID: 21976
           Summary: [imports]: Preventing DOM hierarchy cycles
    Classification: Unclassified
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]
            Blocks: 20683

Seems like we'd like to disallow a hierchy cycle via link imports, the same way
we do for template.content and element->shadowroot.

append/insert child check the
http://dom.spec.whatwg.org/#concept-tree-host-including-inclusive-ancestor.

however, if a document can be linked by multiple link.import.content, then it
essentially has multiple hosts and thus the host-inclusive-ancestor must walk a
tree-shaped (rather than linear) ancestry chain.

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