        <li>
                    Start by understanding the
                    <a href="barplot_basic.html">basics of barplot</a> in d3.js.
                  </li>
                  <br />
                  <li>
                    Data is available
                    <a
                      href="https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/data_stacked.csv"
                      >here</a
                    >. Have a look to it. Note the <u>wide</u> (untidy) format:
           