Moveable, resizeable iframe with BroadcastChannel API for Reconciliation and Suggest?

I’ve been talking about BroadcastChannel API before because I saw it demo’d one day at a meetup in Dallas, but couldn’t find a good example that “might” demonstrate some of the ideas I had for supporting larger reconcile and suggest panels for viewing more content like disambiguating properties returned from a service (images, texts, etc. in an iframe).

Here’s an example although the documents must share the same origin?
jsPanel BroadcastChannel