This D3.js scatter plot visualizes the Iris dataset, mapping petal length and width for each sample while coloring points by species using a custom marker function. The chart displays axes labeled “PETAL LENGTH” and “SEPAL LENGTH” with rotated text, and uses d3.csv to load the data, d3.scaleLinear for scaling, and d3.axisLeft/axisBottom for tick marks. Rendered as SVG, the plot derives dimensions from window.innerWidth and window.innerHeight.