Fork of Smiley Face Part II Test
This example renders a yellow smiley face that fills the entire browser window, scaling dynamically to the viewport size. It uses React to create SVG circles for the face, eyes, and a placeholder mouth, with all positions and dimensions calculated from the window dimensions. The implementation relies on React’s `ReactDOM.render` and JSX syntax, with hardcoded constants for eye offset, radius, and stroke width. The code is a minimal test of reactive SVG rendering, where the face’s radius is derived from the window height minus half the stroke width.