title: Vertical and Horizontal Headers in a table?
body: <p>How would I get a table with both horizontal and vertical headers? </p>
  
  <p>So e.g. </p>
  
  <pre><code>         header1 header2 header3 
  header1    1        1      1
  header2    2        2      2 
  header3    3        3      3 
  </code></pre>