All the ePub's I make are conform specs. If they work in iBooks, good for them. If it doesn't, complain to Apple. I also make use of small-caps and other specs-allowed tags. Some work, some don't (yet).
I have worries for the ePub3 standard as it is published now. I am not the only one. Read the blog by Valloric about it, I agree with most points with him.
I refuse to work around deliberate bad support and programming. Since most ePub's I create are for personal use or for a small group, I can be.
I would find it degrading if Sigil would support work-arounds for the various reading engines, deviating from the supported specs.
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