This interactive scatter plot compares car models by horsepower, MPG, weight, and origin, using drop-down menus to switch the x- and y-axis variables and toggle point size encoding. D3 v7 builds the SVG visualization, applying scaleLinear, scaleSqrt, and scaleOrdinal with a Tableau10 color scheme to map data attributes. Points animate in via transition, and hover tooltips, powered by mouseover events, reveal car details. The legend groups points by origin, while drop-down selections trigger chart redraws through reusable configuration accessors.