This example displays a scatter plot of the classic Iris dataset, mapping sepal length along the x-axis and sepal width on the y-axis. Each data point is rendered as a blue circle with a tooltip showing its x-value, using React to construct the SVG elements and D3.js's `scaleLinear` and `extent` functions to compute scales and domains. The chart includes labeled axes and tick marks, with data loaded from a remote CSV file via D3's `csv` parser.