Hamlet HTML elements are not closed properly. Every element should have proper end tag.

 
 <table id="layout" class="ui-widget-content">
    <thead>
      <tr>
        <td colspan="2">
          <div id="header" class="ui-widget">
            <div id="user">
              Logged in as: null
            </div>
            <div id="logo">
              <img src="/static/hadoop-st.png">
            </div>
            <h1>
              Nodes of the cluster
            </h1>
          </div>
    <tfoot>
      <tr>
        <td colspan="2">
          <div id="footer" class="ui-widget">
            <a href="http://hadoop.apache.org/">About Apache Hadoop</a>
          </div>
    <tbody>
      <tr>
        <td id="navcell">
          <div id="nav">
            <h3>
              Cluster
            </h3>
            <ul>
              <li>
                <a href="/null/cluster">About</a>
              <li>
                <a href="/null/nodes">Nodes</a>
              <li>
                <a href="/null/apps">Applications</a>
              <li>
                <a href="/null/scheduler">Scheduler</a>
            </ul>
            <h3>
              Tools
            </h3>
            <ul>
              <li>
                <a href="/conf">Configuration</a>
              <li>
                <a href="/logs">Local logs</a>
              <li>
                <a href="/stacks">Server stacks</a>
              <li>
                <a href="/metrics">Server metrics</a>
            </ul>
          </div>
          <div id="themeswitcher">
          </div>
        <td class="content">
          <table id="nodes">
            <thead>
              <tr>
                <th class="rack">
                  Rack
                <th class="nodeaddress">
                  Node Address
                <th class="nodehttpaddress">
                  Node HTTP Address
                <th class="healthStatus">
                  Health-status
                <th class="lastHealthUpdate">
                  Last health-update
                <th class="healthReport">
                  Health-report
                <th class="containers">
                  Containers
            <tbody>
              <tr>
                <td>
                  rack0
                <td>
                  host0:123
                <td>
                  <a href="http://localhost:0">localhost:0</a>
                <td>
                  Unhealthy
                <td>
                  N/A
                <td>
                  null
              <tr>
                <td>
                  rack0
                <td>
                  host1:123
                <td>
                  <a href="http://localhost:0">localhost:0</a>
                <td>
                  Unhealthy
                <td>
                  N/A
                <td>
                  null
            </tbody>
          </table>
    </tbody>
  </table>
</html>