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

This is a problem for both instantiation via the parser, and for upgrade, right? I think I land on the side of not instantiating merely because the expectation of template content in the first place is to deep-clone it for later use. The cloning process will [maybe?] instantiate a new custom element anyway--why do the work twice?

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https://github.com/w3c/webcomponents/issues/406#issuecomment-191465100