title: Setting iFrame CSS to display:none during load
body: <p>I have this:</p>
  
  <pre><code>&lt;div class="upload_slide"&gt;
      &lt;iframe class="upload_iframe" style="visibility:hidden;"&gt;&lt;/iframe&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>If I then post some files to the iFrame and set <code>.upload_slide</code> to <code>display:none;</code>, while it's loading, will this affect the loading of the iFrame or the detection of when it finished loading?</p>