ELB for Websockets SSL

Does AWS support websockets with SSL ?

Can EWS ELB be used for websockets over SSL ?

What happens when a EC2 instance(machine) is added or removed to this ELB. Especially removed; what if a machine goes down. are the existing sockets routed to some other machine or reseted to connected.

can ELB be a bottleneck at any point in time.

any other alternatives .. let me know