This example demonstrates basic SVG shape rendering within a minimal HTML page. It shows three circles arranged in a row, with the third circle filled in yellow, alongside an unfilled rectangle with a black stroke. The code directly uses SVG elements like `<rect>` and `<circle>`, setting attributes such as `cx`, `cy`, `r`, `fill`, and `stroke` inline. It relies on a simple static SVG definition rather than any JavaScript library or data source, serving as a foundational test of SVG fundamentals in a React project.