Static ReadonlyANYThe decoder decides (in practice like FrameDisposalModes.KEEP)
Static ReadonlyBACKGROUNDThe frame's area is cleared to transparent
Static ReadonlyKEEPThe frame stays, the next one is drawn over it (the default)
Static ReadonlyPREVIOUSThe frame's area goes back to what it was before the frame
What happens to a frame's area before the next frame is drawn, see Frame.disposalMode