New Twiddle

components.something-animated.js

import Ember from 'ember';

export default Ember.Component.extend({
  animateBool: true,
  actions: {
  	applyAnimation() {
    	this.toggleProperty('animateBool')
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.something-fixed {
	min-height: 80px;
  background-color: lightblue;
  top:0;
  left:0;
}

.liquid-fixed {
	position: fixed;
  top: 0;
  left: 0;
  min-height: 40px;
  min-width:80px;
}

templates.application.hbs

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

templates.components.something-animated.hbs

<button {{action 'applyAnimation'}}>Apply animation</button>

{{#liquid-if animateBool class="liquid-fixed"}}
<div class="something-fixed">
fixed
</div>
{{/liquid-if}}

templates.index.hbs

{{something-animated}} 
index

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",
    "liquid-fire": "0.27.3"
  }
}