SVG Fundamentals
This example demonstrates how SVG shapes are rendered inside an HTML page, showing two circles with different fill colors. The first circle has no explicit fill, so it uses the default black, while the second specifies a red fill. The rendering relies on raw SVG markup embedded directly in the HTML file, using the `<svg>` element with `<circle>` child elements and their `cx`, `cy`, and `r` attributes. The code does not use any JavaScript libraries or data sources, instead relying on the browser’s native SVG support.