This example demonstrates how a D3.js visualization can adapt to browser window resizing by redrawing an SVG to match its container’s current dimensions. It uses a fixed-position div and extracts `clientWidth` and `clientHeight` on each resize event, then updates the SVG’s width and height attributes accordingly. The redraw function binds two line elements to render a green X that spans the full chart area, with the lines’ coordinates recalculated from the new size. The code relies on D3 v5’s selection, data join, and merge patterns, along with a standard `window` resize listener to trigger the update.