This D3 scatter plot visualizes the classic Iris flower dataset, mapping petal length on the x-axis against sepal length on the y-axis. Each data point is rendered as a circle with an SVG `<title>` element that reveals precise coordinates on hover. The visualization uses `d3.scaleLinear` to map data values to pixel positions within specified margins, while `d3.axisBottom` and `d3.axisLeft` create labeled axes. The code loads data asynchronously via `d3.csv` and generates the plot with `d3.select` and `.join('circle')`.