Even if you have all those devices to test on, you only gain a small measure of confidence in the results, as you are only side-loading. Amazon, B&N, et al would really do us a solid if they provided reliable previewers.
I'm mystified by B&N (Nook Press) in particular. Why provide a false sense of security to the self-publisher with its faux previewer, only to munch the living hell out of the final processed product?
Having said that, Tex and I know for a fact there is a way to write code that'll prevent Nook Press from mangling it. But as Tex has also said, that could change in a heartbeat.
As an author, I don't sleep well realizing that an eBook bought today will be properly formatted, but that the same eBook could be rendered as total crap the very next day with either a change in the firmware or the ePub processor itself.
It's no wonder the smart money is on print books to prevail in the end. I share that opinion myself.
G
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