Sets or retrieves the scheme, hostname, and port of the document that fired the HTMLWindowEvents3::onmessage event.
HRESULT value = object.put_origin( v);HRESULT value = object.get_origin(* p);
a scheme followed by a hostname and a possibly a port.
The origin includes the scheme, hostname, and port of the document, but not its path or fragment identifier. The scheme protocol must be either HTTP (unsecured) or Secure Hypertext Transfer Protocol (HTTPS).