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Feedback by the CSS WG, see http://lists.w3.org/Archives/Public/public-tt/2015Apr/0007.html The list in section 5.5 (http://dev.w3.org/html5/webvtt/#webvtt-cue-text-dom-construction-rules) doesn't seem to apply the IDs of region objects.
see bug 28474; that fix should fix this also.
Fixed in https://github.com/w3c/webvtt/pull/349