This example shows a smiley face drawn with SVG, whose eyebrows move to create a playful, animated expression. Built with D3.js v5, the code uses the `select` and `arc` APIs from the `d3` module to construct the face’s features and manipulate the SVG canvas. The project reads no external data, instead generating the entire visual from hardcoded coordinates and dimensions within an `index.js` script. The rendering is purely vector-based, with styling provided by a separate `styles.css` file.