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CORS flag is used in the step 4 but not defined as an argument in the top text of the section.
https://github.com/whatwg/fetch/commit/9014f52207bd12f9882ee929d13d3b39def02790 https://github.com/whatwg/fetch/commit/3a8f4949a6d28e921af1748f6ab2da89b2afb6d9