Tree-map (sales by region·category)

The canonical BI tree-map: revenue broken down hierarchically into nested rectangles - bigger value = bigger rectangle. The squarified algorithm keeps every cell close to a square so labels stay readable. Switch the drill order (Region → Category vs. Category → Region) to compare the same data two ways.

A live, editable Svelte 5 data grid example. Open the interactive demo or read the documentation.