Smily Face
This example shows a single, static smiley face drawn as a yellow circle with two smaller black circles for eyes, rendered inside an SVG canvas. The React component returns the SVG markup directly, using `circle` elements with fixed `cx`, `cy`, and `r` attributes to position the face and eyes. It uses React 16.9 and `ReactDOM.render` to mount the component into the page’s root element. The rendering is purely declarative, with no animation or interactivity.