This example shows a single SVG canvas containing three concentric circles and a diagonal pink line. The circles are stacked, with the outermost circle using the default black fill, the middle circle filled red, and the innermost filled blue. The line stretches from the top-left corner toward the center-right. The visualization is built with plain HTML, CSS, and JavaScript, rendering directly to an SVG element. It demonstrates basic SVG shape creation using the `<circle>` and `<line>` elements within a React-free static page, with no interaction or data binding.