This example demonstrates a simple smiling face rendered as an SVG using D3 v6 within a React framework. It shows how to compose basic geometric shapes—a yellow circle for the head, circles for eyes, rectangles for eyebrows, and an arc for the mouth—positioned relative to the SVG’s center. The code uses D3’s `select` and `arc` APIs to build the scene, with an animated eyebrow transition that shifts vertically over one second. The visualization serves as a minimal starter template for HTML and D3 projects.