This example demonstrates a responsive SVG visualization that fills the entire browser window and redraws its content whenever the viewport size changes. The page uses CSS to stretch a chart container to full screen, then d3.js extracts the container’s clientWidth and clientHeight on each resize event to update the SVG’s width and height attributes. Two diagonal lines form a green X marker whose endpoints adjust to the current dimensions, showcasing how to bind data containing the new coordinates and re-render with a selection merge. The code relies on d3.select, selection.attr, and window.addEventListener for the resize handling.