This area chart visualizes the average alcohol content of white wine across quality scores, using data from a CSV file. The visualization groups wines by quality rating and computes the mean alcohol percentage for each score. Built with D3.js v7, the chart combines a filled area path with an overlaid line, points, and value labels, all rendered as SVG. The code uses D3 scales, axes, the `d3.area` generator, and `d3.rollup` for data aggregation, with styling defined in an external CSS file.