An interactive SVG map of Europe visualizes average fuel prices per country, with a hover tooltip showing the country name and price, and a click-to-edit feature that allows users to adjust values in a pinned info box. Built with Svelte and D3.js, the map uses a D3 Geo Mercator projection and `d3.geoPath` for rendering, while a custom color scale (`d3.scaleLinear`) maps price ranges from green to red. Fuel type can be switched between Euro 95, Diesel, and LPG, with prices stored in a data store and persisted to localStorage.