This example visualizes global COVID-19 testing data by continent, displaying new test counts as horizontal bars. The visualization uses D3 v5 and React to render an SVG bar chart, with D3's `scaleBand` and `scaleLinear` mapping continent names and test values to screen coordinates. Axes are drawn manually using D3's `axisBottom` and `axisLeft` components. The bar chart loads data from a CSV file using D3's `csv` function, filtering to show the first twelve records. A second, unused 3D scatter plot with Plotly is also present in the code, though it is not rendered in the final output.