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"is a sequence of alphanumeric ASCII characters" This is confusing. NCName [1] includes combining characters and extenders that are not ASCII characters. These should be allowed, because custom element names MUST match the NCName production and there is no restriction on the character set. I think "is a sequence of alphanumeric ASCII characters" should be "MUST be a sequence of ASCII characters". [1] <http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName>
Moved to https://github.com/w3c/webcomponents/issues/239