A horizontal bar chart displays the top 10 countries by confirmed COVID-19 cases on March 19, with China and Italy leading. The visualization loads data from a CSV file using `d3.csv`, then renders SVG rectangles scaled by a linear x-axis and a categorical y-axis. It uses `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` from D3 v5, with a clickable "Hello" button in the HTML. Axis lines and ticks are removed, and bars are colored grey via CSS.