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Originally Posted by david8866
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Well, yes and no. Some ePubs are more equal than others (with apologies to George Orwell). I've spent hours editing ePubs that were not even within spitting distance of the ePub standard. And yes, you will find epubs that work happily on the Kobo that do not work on a Nook or Sony or iDevice and vice versa.
Then we get into the proprietary extensions to the ePub standard -- try running the stylesheet through the W3C validator (Sigil offers this from the Tools menu or check on the web
http://jigsaw.w3.org/css-validator/validator. It will warn you about vendor extensions and remove stylesheet items that are invalid before displaying your stylesheet. I had one book I purchased which had about 60% of the stylesheet items removed as being invalid. Oddly enough after cleaning up the stylesheet and correcting it's errors, the ebook displayed without issues on my Kobo, iPad and Nexus 7.
Regards,
David