This scatter plot displays the relationship between sepal length and petal length for the Iris dataset, with species differentiated by shape. The visualization uses D3 v7's `scaleLinear`, `scaleOrdinal`, `symbolsFill`, and `symbol` APIs to map data to positions and shapes, while `axisLeft` and `axisBottom` render the axes. A custom `shapeLegend` built with D3's `symbol` generator and tick marks shows the species mapping. Data is loaded via `csvParse` from a remote GitHub-hosted CSV file, and the chart fills the browser window using `window.innerWidth` and `window.innerHeight`.