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

@rniwa To be fair, everyone replying to that tweet has never used a custom element, so they don't know the tag name rules and are making syntax up. 

I think `<x-あ>` or `<x-🎉>` is a thing you can explain fairly easily in v1: custom tags need a hyphen (or you can drop the hyphen altogether, I don't have an opinion on that), and they need to start with an ascii character ("because legacy"). While needing the `x-` is a bit annoying, isn't that way better than saying "you can never get あ in there ever"?

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https://github.com/w3c/webcomponents/issues/239#issuecomment-191491960