ssion">omitted</dfn>. 
      The subsection for each element in the <a href="elements.html">HTML elements</a> section of this
      reference provides information about which tags (if any)
      can be omitted for that particular element.</li>
      <li>A non-<a href="syntax.html#void-element" id="void-element_xref4">void</a> element
      <a href="terminology.html#must-requirement" id="must-requirement_xref25">must</a>
      have
      an end tag, unless the subsection for that element in the <a href="elem