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We need to make it part of the WebVTT model and remove the cross-reference.
There's now "text track cue data" instead: https://html.spec.whatwg.org/#text-track-cue-data I don't think it's just a matter of introducing "text track cue text" in WebVTT, rather the "text track cue data" concept needs to be specialized to be a string or some such. Alternatively, drop "text track cue data" from HTML to make it a bit simpler.
HTML bug to sort out the hooks: https://www.w3.org/Bugs/Public/show_bug.cgi?id=27102