Sample fork
This example demonstrates the VizHub V3 Runtime Environment's "Hello World" starting point, featuring continuous hot reloading with interactive widgets. The code exports a `main` function that takes a container DIV element and renders a "Hello class" message with a `font-size` of 217 pixels directly into the container's innerHTML. Users can adjust this font size in real time by Alt-dragging the number in the editor, showing how state changes propagate without manual refreshes.