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VTTCue is positioned in the horizontal direction using position, size and align. That seems to cover the same functionality as VTTRegion's width, regionAnchorX/Y and viewportAnchorX/Y, so it would be nice to only have a single model to work with, both for authors and implementations where those bits could be shared.
Um, sorry, take regionAnchorY and viewportAnchorY out of that. Those could be replaced by lineAlign of equivalent.