title: Dojo conditional form validation only for those fields which are inside a visible dd tag
body: <p>In the following code only the first mandatory dijit element should be validated and not the second one, as it is contained in a dd tag which is invisible. </p>
  
  <pre><code>&lt;dl&gt;
      &lt;dt&gt;Label&lt;/dt&gt;
      &lt;dd&gt;mandatory dijit element&lt;/dd&gt;
  
      &lt;dt style="display:none;"&gt;Label&lt;/dt&gt;
      &lt;dd style="display:none;"&gt;mandatory  dijit element&lt;/dd&gt;
  
      &lt;dt&gt;&lt;/dt&gt;
      &lt;dd&gt;dijit submit&lt;/dd&gt;
  &lt;dl&gt;
  </code></pre>