The SameSite attribute section seems like it was written at a time when only cross-site (A embeds B) Partitioned cookies were supported. Now that we support top-level / ABA Partitioned cookies we should update the section to clarify what happens when you set cookies with SameSite=Strict; Partitioned.

We should also update the spec and write WPTs :)

@bvandersloot-mozilla FYI since Mozilla is prototyping this

cc @cfredric @DCtheTall