Re: [w3c/webcomponents] Why do we really need hyphens? (#658)

@baocang I meant that parser needs an explicit direction about whether the element can be upgraded later on (and thus should not be treated as unknown) or not. Please see the [spec](https://www.w3.org/TR/custom-elements/#custom-elements-upgrades-examples) for upgrading definition.

@trusktr condider the fact that user can disable JavaScript and DOM would still ve rendered, see also explanation [here](https://github.com/shawnbot/custom-elements/blob/master/README.md#why-custom-elements).

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