A smiley face is rendered as an SVG graphic that fills the browser window, with its face scaled relative to the viewport dimensions. The example uses React 16.9 to declaratively construct the SVG elements, computing the circle’s radius from the window height and positioning the eyes and mouth via translated coordinate offsets. Rather than a static graphic, the code adapts the drawing to the user’s screen size. It relies on ReactDOM to mount the component into the DOM, with styling provided by inline CSS in the HTML file.