Specification: https://html.spec.whatwg.org/multipage/comms.html
Multipage: https://html.spec.whatwg.org/multipage/#message-ports
Complete: https://html.spec.whatwg.org/#message-ports
Referrer: https://www.google.com/

Comment:
There's no way to tell when a MessagePort is closed.

If we amend the close method of a MessagePort to send a "close" event to its
entangled partner (and ensure that when a browser tab is closed, all its open
message ports are closed) then the programmer using a MessagePort can handle
this event and remove the reference to the MessagePort.

This is a much nicer solution than the PortCollection. Sure, it can leak
memory if the programmer doesn't handle the callback and remove the reference,
but this is easy to document and understand.

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