 classic table.
                  </li>
                  <br />
                  <li>
                    Before building this complicated chart, understand how to
                    draw a <a href="arc_basic.html">basic arc diagram</a>, and
                    how to
                    <a href="arc_highlight.html">highlight links on hover</a>.
                  </li>
                  <br />
                  <li>
                    All other customization are basic d3.js concept, like using
         