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

Right.

The way I see it, it would be confusing to allow non-ASCII letters in non-first letters because if I'm told that I can use non-ASCII letters in my tag name, I sure expect be able to use it everywhere not just but-first letters.  Like security we can't guarantee, a feature that doesn't meet author expectation from get go like this is rather harmful in my opinion.

Look no further than @notwaldorf's tweet in which everyone uses emoji as the first letter of a custom element tag name: https://twitter.com/muanchiou/status/704553939346173952

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