This scatter plot visualizes the Iris dataset, plotting sepal length against petal length and distinguishing species by shape. The visualization uses D3 v7's `scaleLinear` for axes, `scaleOrdinal` with `symbolsFill` for shape encoding, and a custom legend. Data is loaded asynchronously via `fetch` and parsed with `csvParse`, with numeric fields converted to numbers. The plot renders using SVG `path` marks positioned by D3 scales.