Looks like Kobo have changed something with 3.0.0. For some time I have had the following in my kepub-book.css:
Code:
body {
orphans: 0 !important;
widows: 0 !important;
}
And it worked perfectly. I just changed the numbers to 4, and it made no change. That suggests the ACCESS renderer is ignoring the widows and orphans CSS settings.
This is just a quick test on one book. I'll have more of a play later and see if I am right.