This example renders a simple smiley face using React and D3 within an SVG canvas. It shows a yellow circle head with two black eyes and an open mouth outlined as an arc. The visualization uses D3’s `arc()` generator to compute the mouth path, with static coordinates for the eyes and face. React manages the component structure, while D3 v5 provides the shape-drawing API, all displayed through SVG elements in a fixed 960×540 viewport.