This example demonstrates a simple SVG visualization that responds to browser window resizing. It uses CSS to stretch a fixed-position chart container and JavaScript to redraw the graphic whenever the window dimensions change. The code reads the container’s `clientWidth` and `clientHeight`, sets the SVG’s width and height attributes accordingly, and draws two green diagonal lines forming an X using d3.select, `attr`, and line elements. A window `resize` event listener triggers the `redraw` function, ensuring the graphic always fills the viewport.