Smiley Face Part 2
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A smiley face remains static and centered, while a single gray circle tracks the mouse movement across the SVG canvas. The React component uses `useState` and `useCallback` to update the circle's `cx` and `cy` attributes on every `mousemove` event, rendering via ReactDOM. The example demonstrates interactive SVG rendering with React and D3 v7, though it does not use D3-specific APIs beyond the imported library.
AI-generated descriptionA bare minimum HTML page.
MIT Licensed