This example renders a choropleth map of Australia using a GeoJSON file. The code employs D3 v5's `geoMercator` projection and `geoPath` to convert geographic coordinates into SVG paths, with `scaleOrdinal` and `schemeCategory10` assigning categorical colors to electoral divisions. State names are placed at path centroids. The map is drawn in SVG within a React-free HTML page, loading data via `json()` and styling borders through CSS.