This example demonstrates fundamental SVG shapes and attributes, using a series of circles, rectangles, and lines to illustrate basic styling and positioning. The circles show default black fill, a blue filled circle, and a smaller red circle overlaid on the blue one. The rectangle has no fill but a thick black stroke, while the line uses a navy color and a wide stroke. The code relies solely on the native SVG API within an HTML document, with no external libraries or data sources.