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Calibre's Viewer and many others that run on a PC are based upon web browsers.
THEY forgive way too many deviations from EPUB limitations.
All the experts will tell you: Test on the target devices..
Just because it looks fine in Calibre , and it validates, does not mean you did not use something in your code that brand X ignores or gets wrong.
RMSDK was famous for ignoring the whole stylesheet if it had an error in one place.
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