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See https://lists.w3.org/Archives/Public/public-webapps/2015JanMar/0731.html We should make the custom element's constructor be called synchrnously instead of at the end of the micro-task since that's not consistent with builtin elements and exposes "unconstructed" elements in some cases; e.g. immediately after cloning or setting innerHTML.
Moved to https://github.com/w3c/webcomponents/issues/137