This example renders the classic Iris dataset as a scatter plot, encoding species with different D3 symbols and using petal width and sepal length for the x- and y-axes. The reusable D3 chart is built with `scaleLinear`, `scaleOrdinal`, `symbol`, and `symbols`, while axes are drawn using `axisLeft` and `axisBottom`. Data is loaded asynchronously from a GitHub Gist via the D3 `csv` function, and the result is rendered as SVG. The plot fills the browser window, with margins and symbol size configured through a chainable API.