This example shows a correlation matrix for abalone measurements, with eight variables (v1–v8) displayed as a triangular grid of colored cells. A dropdown menu lets the viewer switch between male, female, and infant subsets of the data. Each cell is filled using a red-white-steelblue chroma.scale diverging palette centered on the average correlation, with the correlation value printed inside. The visualization uses d3.scaleBand for axes, d3.axisTop and d3.axisLeft for labels, and transitions to fade in the SVG rectangles, with a gradient legend rendered below.