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- means that the mechanism for connecting or communicating with a presentation entered an unrecoverable error.
- means that either the controlling browsing context or the receiving browsing context that were connected by the
- means that the browser closed the connection, for example, because the browsing context that owned the connection navigated or was discarded.
reason attribute is
error, the user agent SHOULD set the error message to a human readable description of how the communication channel encountered an error.