This example demonstrates fundamental DOM manipulation with D3.js by constructing a cartoon smiley face from SVG elements, including a circle for the face, white eyes, colored eyebrows, a nose, mouth, ears, hair, and teeth. The code uses d3.select to append and style each shape with class-based CSS transformations. It relies on D3 v5 via a CDN link, rendering entirely in SVG without data binding, instead showcasing direct element creation and attribute assignment as a beginner-friendly exercise.