title: Load Iframe with spinner
body: <p>This code loads correctly the spinner, but how do I hide it after loading completes?</p>
  
  <pre><code>iframe {
      background-image: url("http://jimpunk.net/Loading/wp-content/uploads/loading2.gif");   
      background-repeat: no-repeat;
      background-position: 50% 50%;
  }
  </code></pre>