This example shows a simple smiley face rendered as SVG elements, including a yellow circle for the face, black circles for eyes, and a path for the mouth. The code uses d3-selection’s `select` and `append` methods to build the SVG structure, and d3-shape’s `arc` function to generate the mouth’s curved path. The visualization is static, with dimensions pulled from the SVG’s width and height attributes. It serves as a minimal starter template for integrating D3 with React and SVG rendering.