SVG fundamentals
This example demonstrates the fundamental use of SVG to render a single circle element on an HTML page. It shows a basic visualization of a geometric shape using the `<circle>` tag, which defines a circle’s position and radius through its `cx`, `cy`, and `r` attributes. The code relies on inline SVG within an `index.html` file, with no external JavaScript or CSS libraries, relying purely on SVG’s built-in rendering capabilities. The circle appears centered at coordinates (50, 50) with a radius of 50 pixels, illustrating how SVG shapes are constructed directly in markup.