SVG fundam
This example demonstrates fundamental SVG shapes and styling within a static HTML document, showing a large blue-outlined rectangle, two concentric circles (red and green), and a navy diagonal line. The rendering relies entirely on the native SVG API, using elements like `rect`, `circle`, and `line` with attributes for position, radius, color, and stroke width. No JavaScript libraries are used; the visualization is purely declarative markup embedded directly in the page.