This example demonstrates how a visualization can adapt to browser resizing by redrawing an SVG that fills the viewport. It shows a large, semi-transparent green X spanning the entire frame, whose endpoints are recalculated whenever the window changes. The code uses D3 v5 to select the chart container, append the SVG, and bind the line data. It relies on the browser’s `resize` event and CSS’s `clientWidth` and `clientHeight` properties to determine the current container dimensions, then updates the SVG’s width, height, and line coordinates accordingly.