Unsafe JS attempt to access frame error when trying a simple jQuery UI example in CodePen
<p>This is the example: 
<a href="http://codepen.io/herophuong/pen/cpfIz" rel="nofollow">http://codepen.io/herophuong/pen/cpfIz</a></p>

<p>Error:</p>

<pre><code>Unsafe JavaScript attempt to access frame with URL http://secure.codepen.io/pen/secure_iframe from frame with URL http://codepen.io/herophuong/pen/cpfIz. Domains, protocols and ports must match.
</code></pre>

<p>The console keeps counting that error up to infinity. May I do something wrong?</p>

<p>Update: The error triggers only when the focus is inside the Result Pane.</p>
