This example demonstrates a sunrise animation built with D3.js, where the sun rises over a series of mountains while the sky transitions from light blue to orange. The animation is driven by `requestAnimationFrame`, updating the sun’s position and interpolating the background color using `d3.interpolate`. The scene is rendered as SVG elements—a sky rectangle, sun circle with radiating spike lines, and three polygons forming the mountain silhouettes—all created via D3’s selection and append methods. The code loads D3 from UNPKG and relies on ES6 modules.