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I found this test about url spec. ``` # Basic canonicalization, uppercase should be converted to lowercase http://ExAmPlE.CoM http://other.com/ s:http p:/ h:example.com ``` https://github.com/w3c/web-platform-tests/blob/master/url/urltestdata.txt#L100 but I couldn't find about this in spec. which part mentions it ?
That is part of https://url.spec.whatwg.org/#concept-domain-to-ascii which references http://www.unicode.org/reports/tr46/#ToASCII which references http://www.unicode.org/reports/tr46/#Processing which does some mapping based on a table which lowercases.