Internal
What integrateMetabox knows about the iframe it created and the origin it pointed that iframe at. Lets the Communicator check who is talking to it and address the configurator by its exact origin instead of broadcasting.
integrateMetabox
The embedded iframe, when we created it ourselves.
Origin of the configurator document, or null when it is not known yet.
null
What
integrateMetaboxknows about the iframe it created and the origin it pointed that iframe at. Lets the Communicator check who is talking to it and address the configurator by its exact origin instead of broadcasting.