There has been a reasonable amount of feedback that the name referenceTarget is difficult to understand.

I think it's a reasonable name (ID references to the host should instead go to the designated target), but it might be good to see if we can come up with some alternatives.

One thing we should keep in mind is that if we choose to use separate attributes for each attribute for Phase 2, it would be nice to have a noun which can be used in combination with existing attributes (e.g. "shadowrootariaactivedescendanttarget").