This example demonstrates a minimal React page that manipulates a heading element using D3.js. It shows how d3.select() and d3.selectAll() can alter the DOM, changing the h1 tag’s text, color, and class. The bundled data.json contains a node-link structure with six nodes and two edges, though it is not currently rendered in the visualization. The code relies solely on D3’s selection API, not on forceSimulation or other layout functions, making it a basic introductory exercise in combining React with D3.