This example demonstrates the foundational structure of an SVG visualization, starting with a static “Hello World!” heading and a single red circle rendered directly in the page. The code uses plain HTML and CSS for layout, along with native SVG elements (`<svg>`, `<circle>`) positioned via `cx`, `cy`, and `r` attributes. It illustrates how minimal markup can create a basic geometric shape without any JavaScript libraries, serving as a starting point for more complex React-based visualizations. The rendering approach is purely declarative SVG within a static HTML document.