title: Get radio value inside iframe
body: <p>How do I go about doing this with jQuery?</p>
  
  <p>Basically the structure:</p>
  
  <pre><code>&lt;form id="myForm"&gt;
    &lt;iframe&gt;
      &lt;!-- Normal HTML headers omitted --&gt;
      &lt;input type=radio name="myRadio" value=1&gt;First
      &lt;input type=radio name="myRadio" value=2&gt;Second
      &lt;input type=radio name="myRadio" value=3&gt;Third
    &lt;/iframe&gt;
    &lt;input type=button value="Submit" /&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>I tried various examples from the net such as </p>
  
  <pre><code>$("input[@type=radio][@checked]");
  </code></pre>
  
  <p>But failed. Even with jQuery form plugin's <a href="http://malsup.com/jquery/form/#fields" rel="nofollow noreferrer">.fieldValue()</a> failed.</p>