Pardon my question if this has been discussed elsewhere, but it's not clear from my reading of the "slots" proposal whether they would be allowed to target elements that are not direct children of the component.
I believe the with the `select` attribute this was implicitly required because only compound selectors were supported (i.e. no child or descendent combinators) . Would named slots be able to target elements farther down in the tree?  http://w3c.github.io/webcomponents/spec/shadow/#dfn-content-element-select