This example displays an area chart that visualizes the area of various geometric shapes, with the x-axis showing a sequential shape index and the y-axis representing the measured area. The area is rendered as a filled lightsteelblue path with a steelblue stroke, created using the `d3.area` generator and appended as an SVG path element. Data is loaded asynchronously from a CSV file via `d3.csv`, parsed, and scaled using `d3.scaleLinear` for both axes. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, with labels for "Shape Index" and "Area".