This heatmap visualizes the relationship between twelve university tier types and seven metrics concerning children’s and parents’ income and marital status, with each cell’s color intensity representing the proportional value from the `s4.csv` dataset. Using D3.js v4, the SVG chart positions category labels along the axes and renders colored rectangles based on a quantile color scale. The visualization includes a bold title and employs static, non-interactive rendering, with a custom legend and color palette defined in the code.