<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Tables: Empty Tables</title>
  <style type="text/css">
    table { display: table; height: 5em; width: 5em; background: green; }
  </style>
 </head>
 <body>
  <p>There should be a green block under this paragraph.</p>
  <table xmlns="http://www.example.org/"/>
 </body>
</html>