SIDE AIRBAG ASSEMBLY

A vehicle includes a side airbag assembly including a tray and an airbag. The vehicle includes a vehicle seat that includes a seatback frame having an outboard side and an inboard side spaced from the outboard side in an inboard direction. The vehicle seat includes a tray supported by the seatback frame. The tray is movable relative to the seatback frame in the inboard direction from an undeployed position to a deployed position. The vehicle seat includes an airbag supported by the tray and movable with the tray from the undeployed position to the deployed position.