This example demonstrates basic SVG shape primitives within a web page. It renders a single black circle and a diagonal navy line directly using SVG elements. The code relies on the native SVG API, defining shapes with `circle` and `line` tags inside an `<svg>` container. Coordinates and styling are specified via attributes such as `cx`, `cy`, `r`, `x1`, `y1`, and `stroke`, with no external JavaScript libraries or data sources involved.