This example shows an interactive scatter plot of the Iris dataset, mapping sepal length to the x-axis and petal length to the y-axis, with each species represented by a distinct symbol shape. The visualization uses D3.js v7 APIs including `scaleLinear`, `scaleOrdinal`, `symbolsFill`, and `symbolGenerator` to render the marks, while a custom shape legend displays the species categories. Data is loaded asynchronously from a GitHub-hosted CSV file using `fetch` and parsed with `csvParse`, with numerical fields coerced to numbers before plotting. The chart includes labeled axes and a legend, all rendered within an SVG canvas sized to the full viewport.