This example demonstrates fundamental DOM manipulation with D3.js by building a smiley face with animated eyebrows. It first sets the SVG canvas background to red, then renders the face elements. The code uses D3’s selection and styling methods (`d3.select`, `svg.style`) on an SVG element, with the face constructed via the `bundle.js` script. The visualization relies on D3 v5 and a simple SVG rendering approach, as shown in the embedded HTML and styles.