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http://url.spec.whatwg.org/#host-parsing [[ Let host be the result of utf-8 decode without BOM on the percent decoding of utf-8 encode on input. Let asciiDomain be the result of running domain to ASCII on domain. ]] Step 3 assigns "host". Step 4 processes "domain". I think they refer to the same variable so it should have the same name.
https://github.com/whatwg/url/commit/0ddf05bb05b1e88aed358f939c106813ac421cc4