This scatter plot visualizes the correlation between car horsepower and weight, with points colored by country of origin using the D3 ordinal color scale `d3.scaleOrdinal` and `d3.schemeDark2`. Users can click a legend item to filter the displayed points, dimming all other categories. The visualization is rendered as an SVG using D3 v5, with axes and scales built via `d3.axisBottom` and `d3.axisLeft`, and data loaded from the UCI Auto MPG dataset.