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This example demonstrates a minimal D3 setup where an SVG element is selected and its background color is changed to red using D3 version 7. The page loads D3 from a CDN and applies the styling through a DOMContentLoaded event listener in the main script. It uses the d3.select method to target the SVG and the .style method to alter its background. The accompanying README provides introductory guidance on starting with D3 version 6, while the primary code focuses on basic DOM manipulation with a simple, static visual result.