This HTML starter demonstrates the use of D3 v7 to build an SVG scatterplot with axes and summary statistics. It loads a CSV from a GitHub gist and maps quantitative columns like Horsepower, Torque, and MPG to x-position, y-position, and size, while a categorical Layout column drives color. The code uses `d3.csv`, `scaleLinear`, `scaleOrdinal`, `extent`, `mean`, and `median` APIs to process data and render marks.