nd an
      <a href="syntax.html#syntax-end-tags" id="syntax-end-tags_xref4">end tag</a>,
      its end tag
      <a href="terminology.html#must-requirement" id="must-requirement_xref27">must</a>
      be contained within the
      <a href="syntax.html#contents" id="contents_xref6">contents</a>
      of the same element in which its start tag is contained.
      An
      <a href="syntax.html#syntax-end-tags" id="syntax-end-tags_xref5">end tag</a>
      that is not contained within the same 
      <a href="s