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http://url.spec.whatwg.org/#host-parsing [[ If value is 0 or greater than 255, parse error, return failure. ]] Shouldn't this be If (value is 0 and c is an ASCII digit) or value is greater than 255, then parse error, return failure. Otherwise this will fail at the zero: ::ffff:192.0.2.128
https://github.com/whatwg/url/commit/1c22aa119c354e0020117e02571cec53f7c01064