This example builds a smiling face from basic SVG shapes using D3.js v5. It shows a yellow circle as the head, two black circles for eyes, and a mouth created as a path. The code uses D3’s `select` to target the SVG element and the `arc` generator to define the mouth’s curved shape. Eye positions are set with explicit spacing offsets, while the mouth is transformed into place with a group translation. Rendering is entirely SVG-based, with styling applied via an external CSS file.