Responding to Resize
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This example demonstrates how a D3.js v5 visualization can dynamically respond to browser resizing. The chart container fills the page via CSS, and a `redraw` function extracts the current `clientWidth` and `clientHeight` to set the SVG element’s dimensions. It then draws a large green X using two SVG `line` elements whose endpoints are computed from those dimensions. A `window` `resize` event listener triggers `redraw`, ensuring the X always spans the full viewport. The rendering uses pure SVG with D3’s data join pattern.
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