Choropleth Map
This choropleth map visualizes country-level scalar data using color-coding over a geographical projection. Built with D3.js, it renders SVG paths from TopoJSON world data, with the projection handled by `d3.geoPath` and `d3.geoNaturalEarth1`. The map assigns colors based on a `scalerank` attribute using a `d3.scaleOrdinal` color scale, while a supplementary color legend displays the mapping. Interactivity is included via a zoom feature, and hovering over a country highlights it and displays a tooltip with its name and value.