This example demonstrates interactive selection within a visualization built using Svelte and SVG, where clicking a circle highlights it with a thick black stroke. The circles, positioned with fixed coordinates and varied sizes and colors, respond to user clicks through a Svelte event handler that updates a `selectedId` in the component's state. It showcases a proof-of-concept for wrapping Svelte components via d3-rosetta, allowing state persistence across hot reloads while leveraging Svelte's reactive data binding for the visual update.