Fork of Hello HTML
A yellow smiley face is rendered as a static SVG graphic, centered within a 960 by 500 viewport. The face consists of a yellow circle with a black stroke, two black circular eyes, and a mouth drawn as a filled arc. The drawing uses React for component structure and SVG element creation, while the mouth path is generated with the `d3.arc` helper, specifying inner and outer radii and start and end angles. All geometry parameters are defined as constants, and the single root component is mounted with `ReactDOM.render`.