This example demonstrates the simplest possible SVG visualization: a single circle centered in a 960×500 viewport. The SVG is written directly in the HTML without any JavaScript or D3 dependency. The code renders a single `<circle>` element with an `r` of 200, but no fill or stroke, so the circle appears as an empty outline against the white page background. This minimal fork of the classic “Hello HTML” example highlights the basic structure of an SVG-based data visualization.