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HTML structure: Sets up the basic HTML structure with a div element (#viz) where the D3.jsvisualization will be rendered.
Metadata: Includes the charset and title for the document.
D3.js: Loads the D3.jslibrary from a CDN.
CSS: Links to the style.css file for styling the visualization.
JavaScript: Links to the app.js file where the D3.jsvisualization code is written.