This example demonstrates how to manipulate SVG elements interactively using D3.js within a React framework. A single yellow rectangle changes color, size, and stroke properties when users click buttons labeled "Change Color!", "Grow big!", and "Go back!". The code uses d3.select to target the rectangle by ID and modifies attributes such as fill, width, height, and stroke-width. The heading text also turns red through d3.style. The example uses d3.v5 and renders SVG directly in the browser, with styles defined in an external CSS file.