Ember.js #14697 (htmlSafe) demo

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  normal: Ember.String.htmlSafe('awesome!'),
  
  copied: Ember.copy(Ember.String.htmlSafe('awesome!')),
  
  deeply: Ember.copy(Ember.String.htmlSafe('awesome!'), true)
});

templates.application.hbs

<div>Normal: {{normal}}</div>
<div>Copied: {{copied}}</div>
<div>Deeply: {{deeply}}</div>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}