[webcomponents] Should HTML parser instantiate custom elements inside a template element? (#406)

It seems that we'd instantiate custom elements inside a template element in the parser.  Is this intentional?  Is everyone okay with it?

@annevk @domenic @dglazkov @travisleithead 

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/webcomponents/issues/406