This example compares laptop cost and quantity sold across 160 records from a CSV file. A yellow line chart traces quantity sold over the record index, while thin orange bars represent cost values on the same axes. The visualization uses D3 v7 with SVG rendering, employing `d3.csv`, `d3.scaleLinear`, `d3.line`, and `d3.axisBottom`/`d3.axisLeft`. Axes, labels, and a legend for both series are included.