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"The custom element type identifies a custom element interface and is a sequence of characters that must match the NCName production, must contain a U+002D HYPHEN-MINUS character, and must not contain any uppercase ASCII letters. The custom element type must not be one of the following values:" Would be good to have a note for web devs on why these are requirements
Moved to https://github.com/w3c/webcomponents/issues/166