Only the top margin, actually, and that's in accordance with the CSS spec (which says it
may be ignored). That's at least with CSS2.1:
Quote:
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Originally Posted by CSS2.1
When a forced page break occurs here, the used value of the relevant 'margin-bottom' property is set to '0'; the relevant 'margin-top' used value may either be set to '0' or retained.
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And despite what the note says, the situation in CSS3 does not change in the right direction:
Quote:
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Originally Posted by CSS3
the computed values of the relevant 'margin-top' and 'margin-bottom' properties are set to '0'.
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EDIT: Ah, the
future spec may say something different:
Quote:
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When an unforced page break occurs here, both the adjoining ‘margin-top’ and ‘margin-bottom’ are set to zero. [...] When a forced page break occurs at (1), the used values of any adjoining ‘margin-bottom’ are set to zero.
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(emphasis mine, it says nothing about margin-top in forced page break, meaning it is retained.) But this is CSS3, which is not applicable even for ePub3, I'm afraid.