This example shows a React-rendered SVG smiley face, centered on a full-window canvas with a yellow circular head, black stroke outline, and two black eyes. The face omits a mouth, using only the head and eyes. The code builds the visualization with React and ReactDOM, computing the window dimensions and center coordinates dynamically, then rendering nested SVG circle elements for the head, eyes, and stroke, with stroke-width, position, and radius values derived from the window size.