title: XHTML thead, tfoot and tbody importance
body: <p>Does XHTML have an 'opinion' regarding the use of <code>&lt;thead&gt;</code>, <code>&lt;tfoot&gt;</code> and <code>&lt;tbody&gt;</code>?</p>
  
  <p>Is there a case where they should be used?</p>
  
  <p>Thank you.</p>