HTML does not require NFC (or any other specific normalization form): https://www.w3.org/International/questions/qa-html-css-normalization https://www.w3.org/I

HTML does not require NFC (or any other specific normalization form): https://www.w3.org/International/questions/qa-html-css-normalization https://www.w3.org/International/questions/qa-html-css-norma... Neither does XML (though it XML 1.0 recommends that element names SHOULD be in NFC and XML 1.1 recommends that documents SHOULD be fully normalized): https://www.w3.org/TR/2008/REC-xml-20081126/#sec-suggested-names https://www.w3.org/TR/2008/REC-xml-20081126/#sec-suggested-n... https://www.w3.org/TR/xml11/#sec-normalization-checking https://www.w3.org/TR/xml11/#sec-normalization-checking