This heatmap visualizes automobile specifications from a small dataset, displaying cars along the x-axis and attributes such as engine size, speed, power, and price along the y-axis. Cell colors, rendered with the `d3.scaleSequential` and `d3.interpolateInferno` color scale, encode the power value of each car. The chart is built with D3 v4, using `d3.scaleBand` for axes and SVG rectangles for cells. Interactive tooltips appear on hover, showing the car’s power value.