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http://url.spec.whatwg.org/#parsing [[ If code point is not a URL code point, or code point is "%" and remaining does not start with two ASCII hex digits, parse error. ]] Everywhere this appears it should be the following instead: If code point is not a URL code point and not "%", parse error. If code point is "%" and remaining does not start with two ASCII hex digits, parse error. (In some places there is also a check for the EOF code point. That should remain where applicable.)
Nice catch! https://github.com/whatwg/url/commit/9e557def377a214be480e1401077bd9b986d569a