Fork of Fork of A7: Line Chart
This multi-line chart tracks average engine horsepower from 2010 onward for Audi, BMW, Toyota, and Ford, using data from a cars CSV file. The visualization filters the dataset to these four manufacturers and aggregates values by year, drawing one colored line per brand. Built with D3.js v6, it uses `d3.rollup` to compute group means, `d3.line` for path generation, and the `d3-legend` plugin to render a color legend in an SVG canvas. Missing data points are handled with null gaps in the line stroke.