A yellow smiley face is rendered as three SVG circles inside a 960 by 500 viewport, with two black eyes positioned symmetrically around the center. The code uses React and ReactDOM to declaratively create the SVG elements, setting circle radii and offsets through variables like `centerX`, `centerY`, `eyeOffsetX`, `eyeOffsetY`, and `strokeWidth`. The face is drawn with a yellow fill and a black stroke, while the eyes are plain black circles.