Re: [webcomponents] [Custom]: "are" custom element names ASCII characters, or MUST they be ASCII characters? (#239)

I see, it really depends on what the requirements are. Does it need to be supported by the HTML parser? Does it need to be supported by `createElement()`? Does it need to be supported by `createElementNS()`? Do we want emojis? If the answer to the first three is yes, you could have NCName, plus the limitation that the first code point is an ASCII alpha, plus that it must contain a hyphen. If you also want emojis, it might be good for browsers to implement the latest version of XML, etc.

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