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Feedback by the CSS WG, see http://lists.w3.org/Archives/Public/public-tt/2015Apr/0007.html Section 6.2.3.1: "group of selectors" has no defined meaning. You probably want either "compound selector list" or "complex selector list". http://dev.w3.org/html5/webvtt/#the-cue-pseudo-element
I think we mean simply "selector", which according to http://www.w3.org/TR/selectors4/#syntax: "The term selector can refer to a simple selector, compound selector, complex selector, or selector list."
https://github.com/w3c/webvtt/pull/192
Merged.