There is iBooks for macOS, but then they add their own changes to it so it is not epub3 spec compliant. As far as I can tell, no one has nor will flock to it.
Live html code editing (the only wysiwyg editing for html) via a browser engine is simply not good enough in the code it generates to keep to the xhtml / epub specs. That is why we dropped BookView and added a more limited PageEdit. Those who care about how epubs actually look and work on multiple e-reading devices actually know the only way to really do things right is to directly edit the code.
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