This example shows a yellow circle that follows the mouse cursor across an SVG canvas. Built with React, it uses the `useState` hook to track mouse coordinates and the `useCallback` hook to handle the `onMouseMove` event. The circle’s position is updated by setting the `cx` and `cy` attributes based on the pointer’s client coordinates. The visualization is rendered using React’s `ReactDOM.render` into a root element, with SVG as the output format.