[css-nesting] Meaning of using multiple &

[Loirooriol]

div {
  @nest & > & {
    color: blue;
  }
}

What's the meaning of this? Does it match all div element which are a child of another div element, just like

div > div { color: blue }

Or does it only match the div elements which are a child of themselves (i.e. match nothing)?

[Loirooriol]

OK, I missed this example from the spec:

.foo {
  color: blue;
  & .bar & .baz & .qux { color: red; }
}
/* equivalent to
   .foo { color: blue; }
   .foo .bar .foo .baz .foo .qux { color: red; }
 */