This example shows a force-directed network graph of nodes connected by links, with each node labeled by a name and rendered as a GitHub favicon image. The visualization uses the D3 v3 `d3.layout.force` API to simulate physics-based positioning, applying gravity, charge, and link distance values to arrange the nodes. SVG elements—lines for links and groups containing images and text for nodes—are updated on each tick event as node coordinates change. The input data comes from a local `graph.json` file containing node groups and link centrality metrics.