Quote:
Originally Posted by KevinH
Are all of those css 3.0? The epub3 spec originally specified a subset of css 3.
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That's the funny thing

Clip, orphans, widows, page-break-after/below/inside are all css2.1 properties (grid is 3.0) and only the last versions of webkit support them. But not really, because page-break-after/below/inside (or their css3 replacement break-after/below/inside) still now are not supported; instead the last versions of webkit (from 2019) employ -webkit-column-break-after/below/inside (fortunatelly Sigil use a quite new webkit version and has a great support of css3).
But all this now is doesn't have interest for the OP