A full implementation of CSS 2 should handle right-to-left text just fine, though there might be some difficulty with text laid out in the 'classical' mode of vertical lines read from the right.
I got the impression that the major utility* of these formats lies in making comics easier to read on a small screen (mobile phones are a major part of the market), with tagging to allow individual frames to be presented in succession, or panned as needed.
*apart from DRM of course.
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