New Twiddle

controllers.application.js

import Ember from 'ember';

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

styles.app.css

.ember-view {
  border: 5px dotted black;
  background: #efefef;
}

.ember-view:before {
  content: ".ember-view";
  float: right;
  clear: none;
}

templates.application.hbs

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

<p>Change <code>ember-glimmer-remove-application-template-wrapper</code> in <code>twiddle.json</code> to toggle the wrapper.</p>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {
      "ember-glimmer-remove-application-template-wrapper": true
    }
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "canary",
    "ember-template-compiler": "canary",
    "ember-testing": "canary"
  }
}