This example shows a map of US counties rendered on two stacked HTML canvas elements using Svelte and D3. Clicking a county zooms into it smoothly via a tweened zoom transform, while the visible canvas displays aquamarine paths and a hidden canvas uses color-picking with `getImageData` for accurate hover detection. The map data comes from a GeoJSON file via `d3.json`, with `d3.geoAlbersUsa` and `d3.geoPath` generating the projection and paths. Pressing Escape resets the view.