Hello HTML
A minimal React example renders a single gray circle inside an SVG element, demonstrating the basic structure of an HTML page with embedded SVG markup. The circle is defined directly in the JSX with an `r` attribute of 100, while the SVG width is set to 960. The code uses plain HTML and SVG elements rather than any JavaScript libraries, serving as a starting point for understanding how React components can output SVG visuals. The example focuses on the simplest possible visualization setup, with no data binding or interaction.