title: Is a html table within a table valid?
body: <p>In html, is it valid to have a table inside of a table? </p>
  
  <pre><code>&lt;table&gt;
    &lt;tr&gt;
      &lt;td&gt;
        &lt;table&gt;
          &lt;tr&gt;
            &lt;td&gt;&lt;/td&gt;
          &lt;/tr&gt;
        &lt;/table&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;&lt;/tr&gt;
  &lt;/table&gt; 
  </code></pre>