This example shows a yellow smiley face rendered as an SVG, composed of a circular head, two eyes, and a curved mouth. It uses React to define the component structure and D3’s `arc` generator to create the mouth path, with the face centered and scaled relative to the viewport. The head is drawn with a filled circle and a thick black stroke, while the eyes are simple circles positioned via offset coordinates. The code leverages ReactDOM to mount the component onto a root element, with all dimensions hardcoded in the script.