This scatterplot visualizes the relationship between horsepower and weight for cars from the auto-mpg dataset, with each circle representing a vehicle. The chart uses D3 v5 with SVG rendering, employing `scaleLinear`, `extent`, `axisLeft`, and `axisBottom` to construct the axes and gridlines. Data is loaded via `csv` from a remote URL, and the code explicitly parses numeric fields before rendering. Points are plotted using `selectAll` and `enter().append('circle')`, with semi-transparent steelblue fills to show overlapping density.