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It's practically impossible for a publisher to be aware of all the possible ways their ebook might display on various devices. In the past, producers with similar dilemmas would establish which device handled their product properly, and "endorse" that product, to wit: "We recommend you view this file with the Amazon Kindle Fire."
Unfortunately, ebook production standards are so lax, and (just like the browser wars) publishers are ignoring standards and validation and doing their own thing. So device manufacturers cannot depend on getting a file in a validated format, and so can't guarantee what will be displayed.
If anything, publishers should provide info on whether their file has been validated, and even to what spec. Any device that can consistently and properly display a validated file should be able to read it. If the publisher has not validated their file, they should by law have to state that, too.
Under ideal circumstances, customers should be checking out a device before they buy, so they'll know what to expect.
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