This example shows a force-directed network graph of 13 named nodes connected by 13 weighted links, with each node colored according to its assigned color property and labeled with its name. The visualization uses the D3.js v2 library, creating an SVG rendering that lays out the graph through the `d3.layout.force` API, positioning nodes with charge and distance settings. Links are drawn as lines whose stroke width scales with the square root of the link weight, and nodes are draggable circles with text labels. Data is loaded from the `graph.json` file, and the layout updates position coordinates on each tick event.