This example shows a minimal directed graph with two nodes, "Hello" and "Graphviz", connected by an edge. It displays the Graphviz DOT source code in plain text above the rendered graph. The page uses the Viz.js library, which compiles Graphviz to JavaScript via Emscripten, to convert the DOT string into an SVG diagram. The `Viz` function is called directly in JavaScript to generate the graph output.