d3 Bland Canvas
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A full-window SVG renders a single rounded rectangle over a light gray background. Using D3 v5, the example selects the root `svg` element, sets its dimensions from the browser viewport, and appends a `rect` with a 40-pixel corner radius via `selection.append` and `attr`. The code draws no data; it demonstrates basic D3 selection, styling, and SVG shape creation in a minimal canvas.
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