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http://url.spec.whatwg.org/#percent-decode Algo "percent decode" item 2.3.1 says: "Let bytePoint be the two bytes after byte in input, encoded, and then interpreted as hexadecimal number." It must be: "Let bytePoint be the two bytes after byte in input, DECODED, and then interpreted as hexadecimal number." We take two bytes after "%" sign, then convert these bytes to code points (i.e. we DECODE these bytes), then interprete these letters as byte value written in hex format.
https://github.com/whatwg/url/commit/f7ab990492ff6f6f69b557b7693149f42bba6bd8