Actually one detail is missing from the answer that is selected as accepted (from Phil Ross)....
it DOES work in Chrome, and the solution is really silly!!
Both the parent and the element onto which you want to control page-breaking must be declared as:
position: relative
check out this fiddle: http://jsfiddle.net/petersphilo/QCvA5/5/show/
This is true for:
page-break-before
page-break-after
page-break-inside
However, controlling page-break-inside in Safari does not work (in 5.1.7, at least)
i hope this helps!!!
PS: The question below brought up that fact that recent versions of Chrome no longer respect this, even with the position: relative; trick. However, they do seem to respect:
-webkit-region-break-inside: avoid;
see this fiddle: http://jsfiddle.net/petersphilo/QCvA5/23/show
so i guess we have to add that now...
Hope this helps!