Test that MessagePort messages are delivered even if both ports are inaccessible from JS any more.
Should say PASS twice.
PASS: message delivered. Port: [object MessagePort]
PASS: port closed.
Test that MessagePort messages are delivered even if both ports are inaccessible from JS any more.
Should say PASS twice.
PASS: message delivered. Port: [object MessagePort]
PASS: port closed.