title: Is it semantically valid to put an aside tag inside a header tag?
body: <p>As in:</p>
  
  <pre><code>&lt;header id="mainHeader"&gt;
          &lt;hgroup&gt;
                 &lt;h1&gt;Title&lt;/h1&gt;
                 &lt;h2&gt;Sub Title&lt;/h2&gt;
              &lt;/hgroup&gt;
              &lt;aside&gt;
                  &lt;p&gt;Some content within the header but isn't as important.&lt;/p&gt;
                  &lt;p&gt;Some content within the header but isn't as important line 2.&lt;/p&gt;
              &lt;/aside&gt;            
      &lt;/header&gt;
  </code></pre>
  
  <p>The reason for this, as demonstrated above, is that I have some content that belongs to the header (for instance, a short block of information) but is only somehow related but not really as essential as the h1 and h2 tags.</p>
  
  <p>Or should I just use a normal div?</p>