jQuery UI dialog is setting iframe width automatically

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I want to ask why jQuery UI dialog is setting the width to \"auto\" automatically?
Below is my iframe to be constructed a dialog.
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                <span>2021-02-09 18:45</span>
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<pre><code>&lt;iframe src="&lt;%= AppConfig[:running_url] %&gt;" frameborder="0" scrolling="no"&gt;&lt;/iframe&gt;
&lt;script type="text/javascript" charset="utf-8"&gt;
  $(document).ready(function() {
    $("iframe").height($(window).height());
    $("iframe").width($(window).width());
  });
&lt;/script&gt;
</code></pre>

<p>I think <code>scrolling="no"</code> is necessary.</p>
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                <span>2021-02-09 18:52</span>
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<p>You can define the element <code>width</code> on init :</p>

<pre><code>$('#something').dialog({
    width: '100px'
});
</code></pre>
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                <span>2021-02-09 19:05</span>
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<p>In case anyone else is dealing with this issue and stumbles upon this post, as I did, I eventually found a solution that worked for me at: http://enotacoes.wordpress.com/2012/04/19/setting-iframe-width-in-jquery-dialog/</p>

<p>Basically, you set the min-width in the iframe style instead of (or additionally with) the width style.  </p>

<pre><code>&lt;iframe src="someurl" width="100%" height="100%" frameborder="0" 
        scrolling="no" style="min-width: 95%;height:100%;"/&gt;
</code></pre>
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            var editor = UE.getEditor('editor',{
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