This example shows a simple smiling face constructed from SVG shapes using D3.js version 5. The visualization draws a large yellow circle for the head, two smaller black circles for eyes, and an arc for the mouth, all positioned relative to the SVG canvas dimensions. The code uses D3’s selection API to append circles and a path, with the mouth created via the `arc()` function specifying inner and outer radii and a half-circle angular range. The smiley is rendered directly into an SVG element defined in the HTML, with all styling applied through D3 attribute methods.