This example demonstrates a minimal SVG scene with three basic geometric shapes: a blue circle, a yellow rectangle with a navy border, and a diagonal black line. The SVG markup is written directly in the HTML file using the native `circle`, `rect`, and `line` elements. The page relies on browser-native SVG rendering without external JavaScript libraries, with the shapes positioned using explicit `x`, `y`, `cx`, `cy`, `r`, and `width`/`height` attributes. The markup also includes a commented-out text element and simple CSS styling for possible message display.