A smiley face is rendered as an SVG graphic that scales responsively to fill the browser window. The face is composed of a yellow circle for the head, two solid black circles for the eyes, and a mouth shape, all centered on the viewport. The visualization is built using React, which constructs the SVG elements through JavaScript code. It calculates dimensions like the radius and eye offsets from the window’s width and height, and renders the final composition with ReactDOM.