SVG fundamentals
This example demonstrates the fundamental building blocks of SVG rendering on a web page. It presents three circles arranged in a row, with the middle circle colored red while the others remain black, showing how SVG shapes can be customized. The code uses raw SVG elements directly within an HTML document, with each circle defined by its center coordinates (cx, cy) and radius (r). The fill attribute applies the red color to the second circle, while the other circles use the default black fill. No JavaScript or external libraries are involved, just plain SVG markup in a minimal HTML structure.