Responding to Resize
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This example demonstrates how a D3.js v5 visualization can respond dynamically to browser resize events. An SVG element fills the viewport via CSS positioning, and a redraw function extracts the container’s current pixel dimensions using `clientWidth` and `clientHeight`. The code then sets the SVG’s `width` and `height` attributes accordingly and renders two green diagonal lines to form an X, with an event listener on `window` for the `resize` event triggering the redraw. The visualization uses a data join with `selectAll` and `enter` to update the lines.
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