This area chart visualizes sample sales data from 2010 to 2022, with the x-axis representing years and the y-axis showing sales figures. The chart uses a smooth curve to fill the area beneath the sales trend line, rendering in SVG via D3 v5. It employs `d3.scaleTime` and `d3.scaleLinear` for axes, `d3.area` with `curveBasis` for the filled region, and `d3.axisBottom` and `d3.axisLeft` for labeled ticks. Data is loaded as CSV from a GitHub gist.