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Let me know what I should do to update: http://www.whatwg.org/specs/web-apps/current-work/#content-type-sniffing ...and then reassign this to me. Thanks!
You should now refer directly to the "actual media type" (or whatever it turns out to be after bug 19797).
It is now "sniffed media type". But I should note: As defined, "sniffed media type" refers to the "media type sniffing algorithm". Depending on how you interpret that, it may or may not refer to the sub-algorithms. (Although, since the sub-algorithms refer to "sniffed media type" [as of now], this could be used as evidence that the sub-algorithms are part of the main algorithm.)
Feel free to file more bugs if there's more I need to do!
Checked in as WHATWG revision r7769. Check-in comment: Try to sync more closely with MIMESNIFF. http://html5.org/tools/web-apps-tracker?from=7768&to=7769