California domestic partnerships included hospital visitation rights from 1999.[1] And most marriage rights from 2005.[2] They weren't fully equal. And separate but equal is nonsense anyway. But they came before Proposition 8.

[1] https://en.wikipedia.org/wiki/Domestic_partnership_in_Califo...

[2] https://en.wikipedia.org/wiki/Domestic_partnership_in_Califo...