&
Selector Not in any browser yet
Spec When using a nested style rule, one must be able to refer to the elements matched by the parent rule; that is, after all, the entire point of nesting. To accomplish that, this specification defines a new selector, the nesting selector, written as & (U+0026 AMPERSAND).
Syntax
'&'Formal grammar from the specification, as webref extracts it: the latest level's definition, sometimes ahead of what browsers implement.