This example shows an area chart of age against weight, filled with steelblue, using a dataset fetched from a GitHub gist. It sorts the parsed CSV data by age before rendering. The chart is built with D3.js v7, using `d3.area`, `d3.scaleLinear`, and `d3.axisBottom`/`d3.axisLeft` to generate the SVG path and axes. The visualization includes labeled axes for Age and Weight (kg) and a title, with margins applied to the SVG container.