as the other replies have mentioned, justified text depends on the viewer at this point. the epub spec has added support which can be viewed in the latest version of Adobe's Digital Editions desktop viewer, so justified epubs are definitely possible. feedbooks already supports this option. so far it's not yet available on mobile devices but we can hope for a firmware update in the near future. ideally, of course, this will be a user-specified preference, as opinions do vary (as noted by Cygfrydd).
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