AXR/Specification — Issue #23: grouping in hierarchical notation
Author: Mouvedia
Created: 2011-12-15 23:47:23+00:00
State: open

note {
child1, child2 {
element1, element2 { }
}
}

//equivalent to

note child1 element1 { }
note child1 element2 { }
note child2 element1 { }
note child2 element2 { }

https://developer.mozilla.org/en/CSS/%3A-moz-any
http://dev.w3.org/csswg/selectors4/#matches
http://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html#nested_rules