This example demonstrates how a D3.js v5 SVG chart responds to browser resizing. The visualization renders a single rounded rectangle that fills the entire viewport, with its width and height dynamically updated whenever the window resizes. The implementation uses a fixed-position `#chart` container and reads its `clientWidth` and `clientHeight` properties to set the SVG attributes. The code registers multiple `window.addEventListener` callbacks for the `resize` event, though only the initial redraw function actually updates the rectangle’s dimensions.