That screws down just to the door. There is no seal that goes on top of it.

The door seal goes on the body of the car and is one long piece that starts at the bottom of the door, goes up over the top of the door opening and down the side of the car and into a spot behind the rear window. It is one very long, and expensive, door gasket.

When the door is shut it seals against the door. The chrome piece is just trim. It serves the same function as the chrome trim on the door facing around the door latch.