A world map shows the geographic spread and cumulative confirmed COVID-19 cases as of March 25, 2020. Orange circles, sized with a square-root scale, are positioned by country coordinates using a Mercator projection and the `geoPath` and `geoMercator` functions from D3 v5. The data is loaded from a CSV file and rendered as SVG, with the world map built from TopoJSON data and the slider element in the HTML interface.