Re: [webcomponents] [Custom]: "are" custom element names ASCII characters, or MUST they be ASCII characters? (bugzilla: 22056) (#239)

See the issue 177. There are disagreements as to the exact set of characters allowed in tag names.

Someone either needs to investigate the issue and come up with a safe/correct subset of characters that can be used in custom elements.

I'm suggesting to restrict it to only ASCII characters in v1 since it's always safe to expand the set of characters being allowed latter but not vice versa.

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https://github.com/w3c/webcomponents/issues/239#issuecomment-190585735