New Twiddle

controllers.application.js

import Ember from 'ember';

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

styles.app.css

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

.input-demo {
  display: inline-block;
  position: relative;
  height: 40px;
  width: auto;
  background: pink;
	border: 1px solid gray;
  padding: 4px 8px;
}

.input-demo-input,
.input-demo-display {
  font: 14px/40px sans-serif;
  padding: 0;
  margin: 0;
  min-width: 200px;
  height: 40px;
  background: transparent;
}

.input-demo-input {
  position: absolute;
  top: 4px;
  left: 8px;
  right: 8px;
  bottom: 4px;
  outline: none;
  border: 0;
  opacity: 0;
  z-index: 1;
  width: 100%;
}

.input-demo-input:focus {
  opacity: 1;
}

.input-demo-input:focus ~ .input-demo-display {
  opacity: 0;
}

.input-demo-display {
  z-index: 0;
  display: inline-block;
}

templates.application.hbs

<h1>Pants... that is all.</h1>
<p>The container will grow as you type but has a min-width</p>

<div class="input-demo">
  {{input value=myValue class="input-demo-input"}}
  <span class="input-demo-display">{{myValue}}</span>
</div>

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"
  }
}