19_ cheap tricks for interaction D3.js!
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This example creates a blank, full-window SVG canvas using D3.js v5. The SVG element is sized to match the browser window’s dimensions by reading `document.body.clientWidth` and `clientHeight`, then appends a single rounded rectangle (`rx` of 40) that fills that space. The code uses D3’s `select` function to target the SVG and sets its width and height attributes accordingly. The fixed-position body styling ensures the canvas fills the viewport without scrolling, though no additional interaction or data visualization is implemented beyond this static, rounded background shape.
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