Another funny thing here is that they say “but not limited to” (the listed encodings), but then say “must not support other encodings” (than the listed ones).
> the encodings defined in Encoding, including, but not limited to
where "Encoding" refers to https://encoding.spec.whatwg.org (probably that
should be a link.) So it just means "the other spec defines at least these,
but maybe others too." (e.g. EUC-JP is included in Encoding but not listed
in HTML.)
Another funny thing here is that they say “but not limited to” (the listed encodings), but then say “must not support other encodings” (than the listed ones).