This example renders a yellow smiley face that scales to fill the browser window. The face is drawn with a circular head, two eyes, and no mouth, using React and ReactDOM to create an SVG element with proportional dimensions. The code calculates the window size, centers the graphic, and applies a translation transform to position the facial features relative to that center. It uses hard-coded offsets and radii for the eyes and face, with the head’s radius based on half the window height minus the stroke width.