Simple html + vanilla javascript playground for messing with postMessage between a host page and iframed pages.
In order to enforce cross domain policies, we need to load things from different hosts. To do this locally we need to add entries to your host file.
127.0.0.1 www.fakegis.com
127.0.0.1 site-org.fakehub.fakegis.com
127.0.0.1 www.fakeportal.com
127.0.0.1 dashapp.fakegis.com
127.0.0.1 storyapp.fakegis.com
127.0.0.1 evilcorp.com
We use http-server which is a node module, so first, lets get that installed
$ npm install
With that out of the way, we need to start up two servers - one will run on port 3000 and host the "host" application
$ npm run start:host
In another terminal window, you'll need to start a second server, running on port 3001 and this will host the iframed content
$ npm run start:embeds
Now, open http://www.fakegis.com:3000 which will load the host app, and iframe in the embeds.