[html] Issue: "valid email address" doesn't allow IDNs… marked as i18n

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[html] Issue: "valid email address" doesn't allow IDNs… marked as i18n

r12a via GitHub
chaals has just labeled an issue for https://github.com/w3c/html as
"i18n":

== "valid email address" doesn't allow IDNs… ==
The definition of a [valid email
address](https://w3c.github.io/html/sec-forms.html#valid-e-mail-address)
 only allows for ascii letters, digits, and hyphens in domain names,
and only ascii printable characters before the @ sign. This doesn't
match reality, which now includes IDNs.

Should we insist on putting punycode everywhere, or should we try to
hide that from users and specify how to make internationalised email
addresses?

See https://github.com/w3c/html/issues/538