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Specification: https://html.spec.whatwg.org/multipage/scripting.html Multipage: https://html.spec.whatwg.org/multipage/#case-sensitivity Complete: https://html.spec.whatwg.org/#case-sensitivity Referrer: https://html.spec.whatwg.org/multipage/selectors.html Comment: Weird sentence: “will be work in an ASCII case-insensitive.” Posted from: 91.203.97.247 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.125 Safari/537.36 OPR/30.0.1835.88
Full quote from the non-normative note: “The Selectors specification defines that ID and class selectors, when matched against elements in documents that are in quirks mode, will be work in an ASCII case-insensitive.”
https://github.com/whatwg/html/commit/db0c84035ee11b612f12a8bba057dd8768e52996