D3 Tutorial Code
This example demonstrates the Hello World of the VizHub V3 Runtime Environment, rendering a simple text string inside a plain HTML div. It shows how a minimal visualization can be built without any separate HTML file, relying instead on the runtime’s continuous hot reloading. The code exports a `main` function that receives a `container` DIV and sets its `innerHTML` to display the text at a fixed pixel size via inline styles. No external libraries are used beyond the runtime itself, making this a clean starting point for learning the environment’s core workflow.