This fork of a D3.js heatmap visualizes career data from a CSV file, using an inferno color scale to encode values. The chart displays groups along the x-axis and variables on the y-axis, with each cell’s color intensity reflecting its numeric value. Built with D3 v4, it employs `d3.scaleBand`, `d3.scaleSequential`, and `d3.interpolateInferno` for axes and color mapping. Interactive tooltips show exact cell values on hover, while the SVG rendering includes axis labels and a title.