This example shows how a visualization can respond dynamically to browser window resizing by redrawing an SVG to fill the available space. It uses CSS to make a container div occupy the full viewport, then extracts the computed `clientWidth` and `clientHeight` to set the SVG’s dimensions. A pair of green lines form an X across the chart to visually confirm the resized layout. The code relies on D3 v5’s selection and data join methods, alongside a native `window.addEventListener("resize")` handler to trigger the redraw.