test sandbox

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

initializers.router.js

import Router from 'demo-app/router';
import Ember from 'ember';

window.addEventListener('message', function(m) {
  console.log(m);
});
window.parent.postMessage('boo','http://localhost:4200');
Router.reopen({
  updateUrlBar: Ember.on('didTransition', function() {
    window.parent.postMessage('boo','http://localhost:4200'); 
  })
});

export default {
  name: 'router',
  initialize: function() {}
};

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.4.0",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.5/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.5/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.5/ember-template-compiler.js"
  }
}