Hello
This example demonstrates the "Hello World" for the VizHub V3 Runtime Environment, showing how a single exported `main` function renders directly into a provided container DIV. It uses plain HTML and inline CSS to display the text "Hello World!" at a large font size. The key interactive feature is that the number representing the font size can be adjusted via Alt-drag on the value in the editor, triggering continuous hot reloading that updates the visualization in real time.