scatter plot
This scatter plot visualizes the Iris Dataset, showing the relationship between petal length and petal width for three species of iris flowers. Each point is colored by species (blue, maroon, or violet) using a custom marker function, with the plot rendered as SVG elements appended to the body. The code loads CSV data via `d3.csv`, maps values with `scaleLinear` and `extent`, and builds axes with `axisLeft` and `axisBottom`.