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IMHO the "actual media type" should be called the "sniffed media type". "Actual" implies some level of confidence that we can't justify here.
Blame Anne; he suggested I change it.
Your spec, your blame. :-P
I've renamed 'actual media type' to 'sniffed media type': https://github.com/whatwg/mimesniff/commit/c7ec25efe0a48ca760869d05895a2b8cfd88c9f5 I've also renamed 'specified media type' to 'supplied media type': https://github.com/whatwg/mimesniff/commit/39a7887a0d20c6acc614fdf856ad875514a26d2e