No dasherize

components.my-component.js

import Ember from 'ember';
const { String: {htmlSafe}} = Ember;
export default Ember.Component.extend({
  attributeBindings: ['ariaLabel'],
  ariaLabel: 'Hello!',
  
  didInsertElement() {
    console.log(this.$()[0].outerHTML);
    Ember.set(this, 'text', htmlSafe(`<pre><code>
${this.$()[0].outerHTML.replace('<', '&lt;')}
</code></pre>`));
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

{{text}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}