This example demonstrates how a D3.js visualization can respond dynamically to browser window resizing. The chart fills the entire viewport, drawing a green X composed of two diagonal lines that stretch to match the container’s current dimensions. The code uses D3 v5 with an SVG rendering approach, reacting to the window’s resize event by calling a redraw function. This function extracts the chart div’s client width and height via CSS, then updates the SVG’s attributes and line coordinates accordingly, utilizing D3’s selection and merge operations to efficiently update the graphical elements.