This interactive smiley face uses D3.js v5 to animate its eyebrows in response to DOM events. The visualization is built with SVG elements, manipulated through D3’s selection and attribute methods. The `index.html` file loads D3 from the unpkg CDN, while `bundle.js` contains the JavaScript logic, which directly manipulates SVG shape properties to create the moving eyebrow effect. The data source is not external; all geometry and animation parameters are hardcoded in the script.