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The origin of the window that sent the message at the time postMessage was called. This string is the concatenation of the protocol and "://", the host name if one exists, and ":" followed by a port number if a port is present and differs from the default port for the given protocol. Examples of typical origins are (implying port 443), (implying port 80), and :8080. Note that this origin is not guaranteed to be the current or future origin of that window, which might have been navigated to a different location since postMessage was called.