Closure action bubbling?

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  messages: null,
  
  init() {
    this.messages = [];
  },
  
  actions: {
    parentClick() {
      console.log('parentClicked');
      this.get('messages').pushObject('parentClicked');
    },
    childClick(ev) {
      //ev.stopPropagation(); // <<< remove comment to change
      console.log('childClicked');
      this.get('messages').pushObject('childClicked');
    }
  }
});

application.template.hbs

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

<div onClick={{action "parentClick"}}>
  <input type="button" value="Parent">
  <div>
  <input type="button" value="Child" onClick={{action "childClick"}}>
  </div>
</div>

<hr>

Messages:
<ul>
{{#each messages as |message|}}
  <li>{{message}}</li>
{{/each}}
</ul>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "2.1.0",
    "ember-template-compiler": "2.1.0"
  }
}