This example shows a classic smiley face drawn with SVG shapes, including a yellow circular face, black outline, two eyes, and a curved mouth. The code uses React components to structure the SVG elements and the D3 arc generator (d3.arc) to create the mouth path. The face is centered via a D3-generated transform, with dimensions and positions defined as constants. The rendering relies on ReactDOM to mount the App component into a div, while D3 v5 provides the arc geometry and styling is applied through SVG attributes.