SVG Fundamentals
This example demonstrates the foundational building blocks of SVG rendering by drawing two circles. The code uses plain SVG elements within an HTML page, with a black circle and a red circle positioned at different coordinates. It illustrates how SVG shapes are defined using attributes like `cx`, `cy`, and `r`, and how CSS `fill` can be applied directly to elements. No JavaScript libraries are used; the visualization relies solely on native HTML and SVG markup.