revision:
- specifies the minimum number of lines that must be left at the top of a page or column.
Property values:
integer : specifies the minimum number of lines that must be left at the top of a page or column. Negative values are not allowed
initial : sets this property to its default value.
inherit : inherits this property from its parent element.
example: widows property
@media print {
orphans: 4;
widows: 2;
}