Making a Bar chart
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This example demonstrates the initial setup for creating a bar chart with D3 v5. It selects an SVG element and reads its height and width attributes using `d3.select` and `parseFloat`, preparing the canvas dimensions for future data binding and shape rendering. The page loads D3 from a CDN and applies global styling that removes margins and hides overflow. The visualization does not yet display any bars or data; it only establishes the empty SVG container and foundational layout variables.
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