This visualization displays the Iris dataset as a scatter plot, mapping sepal length on the x-axis and petal length on the y-axis, with points colored and shaped by species. It includes a custom shape legend for the three species. The implementation uses D3 v7 modules like `scaleLinear`, `scaleOrdinal`, and `symbol` to generate marks, while `axisLeft` and `axisBottom` handle the axes. Data is loaded asynchronously via `fetch` and parsed with `csvParse` from a GitHub-hosted CSV file. The chart is rendered into an SVG that fills the viewport.