As for testing ebooks on older devices ... what if you don't have them? You'd have to have dozens to fully test an ebook.
So far I haven't done anything bleeding edge for my clients (not that I could, yet). Novels and self-help books are fairly straightforward. My eformatting mentor stressed the importance of keeping the HTML and CSS as simple as possible, to avoid compatibility problems with the multitudes of devices and apps out there.
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