title: Centralize <thead> in HTML table
body: <p>How can I centralize a thead text in HTML tables?</p>
  
  <p>I'm trying this:</p>
  
  <pre><code>...
  &lt;thead rowspan="3" align="center"&gt;
     &lt;th&gt; Table &lt;/th&gt;
  &lt;/thead&gt;
  ...
  </code></pre>