This example uses D3.js to render a simple SVG smiley face on a red background. The code selects the SVG element and applies a red fill via `svg.style`, while CSS styles define yellow strokes for the face’s lines and paths. It is built with React and D3 v5, using the `select` API from the `d3` module. The visualization is minimal, focusing on basic SVG styling and D3’s selection method rather than data binding.