This example renders a responsive smiley face that scales to fill the browser window. The face consists of a yellow circle with a black outline and two smaller black circles for eyes, all positioned relative to the center of the screen. Built with React and ReactDOM, the visualization uses SVG elements whose coordinates and dimensions are calculated from the window’s inner width and height. The code sets explicit offsets for the eyes and mouth, though the mouth is defined but not drawn, leaving only the head and eyes visible.