absolute selector chain and the descendant combinator

[Mouvedia]

Assuming the element on which you are declaring the function isn't @root, how do you match elements from all scopes using an absolute selector chain?

Example:

//this wouldn't select a root element called "target"
sel(@root .. target);

//would something like this be valid?
sel(@root .. target, @root:is(target));

//or maybe we need a new reference object
sel(@document .. target);
//alternate
sel(@window .. target);

//should this work?
sel(@root @parent .. target)

[Mouvedia]

Grouping covers this edge case adequately.