Hello HTML
This example renders a smiley face using React components to create SVG elements. The code uses ReactDOM to mount an App component that draws circles for the face, eyes, and an arc for the mouth via d3.arc(). It demonstrates React’s declarative syntax for SVG with JavaScript expressions for dynamic values like coordinates and stroke widths, while the commented HTML shows an equivalent static SVG version. The visualization uses d3.v7 and React 17 to produce a simple, interactive-free graphic.