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This example demonstrates a force-directed network visualization built with D3.js. It shows how nodes and links are positioned and animated using `d3.forceSimulation` with force properties for charge, centering, and link distance. The rendering relies on SVG elements created via D3’s data join, while node colors and sizes are directly tied to each data point’s attributes. The code defines an empty HTML document but references D3 via a script tag, indicating the visualization is driven entirely by JavaScript and the simulation’s tick events to update positions dynamically.