[DiapDealer]

You didn't actually mention Google Play Books in that last post. Inquiring minds want to know. I understand perfectly wanting to use code that just works across all platforms, but I also think it's important to understand if your intimation that Google Play Books might be blocking epubs that contain i tags is accurate. Did you mean step 1 of 6 in Google Play Books submission process? Also please note that Google Books and Google Play Books are not the same thing.

Also, is Google Play Publish the only way to submit books tor sale? Or are there other options? Are EPUB2s the only books not allowing i tags, or are EPUB3s blocked as well? Or is it vice-versa?

The fact of the matter is: everyone here is perfectly aware that iBooks is often the odd man out in these matters. That's old hat. But I'd like to be able to confirm whether or not Google Play Books has joined them in this active silliness (and to what exact extent, if so).