Widows and orphans do work in kepubs, but as the default value for both is 2, you won't see a change with what you are doing. Set them to 1 or 0. Strictly, 1 is the minimum value, but 0 seems to work as well.
You might also need to add "!important" in the kebup-book.css. This will force it to override the setting if it has been done in the book.
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