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

@rniwa I'd like to try to address the developer request here if we can.

But if we're concerned about legacy content doing あ<あ>, and we also have the restriction you stated that we shouldn't force a hyphen, then I don't understand how we could ever allow that developer request. Am I missing something?

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