This example shows a scatter plot of Iris flower measurements with a color-coded legend for species. The axes represent sepal length and petal length, while each circle is colored by species using a static `d3.scaleOrdinal` with `d3.schemeCategory10`. The code uses `d3.csv` to load external data, `d3.axisBottom` and `d3.axisLeft` for tick marks, and `d3.legendColor` from the d3-legend library to render the color legend. All elements are drawn as SVG circles and text within a single SVG container, with custom CSS styling for guide lines and labels.