This example uses D3 version 5 and React to render a simple smiley face in SVG. It draws a yellow circle for the head, two black circles for eyes, and a path for the mouth, all positioned with hard-coded coordinates based on the SVG’s width and height. The code imports `select` and `arc` from D3, appends SVG elements via chained `.attr()` calls, and uses inline styling. No external data or interactive behavior is present.