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The term "MIME-type/subtype media resources" is unclear in the first sentence of the introduction. Remove "MIME-type/subtype". It will read: "The specification maintains mappings from in-band audio, video and other data tracks of media resources to HTML VideoTrack, AudioTrack, and TextTrack objects and their attribute values."
Prepared pull request: https://github.com/w3c/HTMLSourcingInbandTracks/pull/23
Fixed in https://github.com/w3c/HTMLSourcingInbandTracks/pull/23