Hello_world_test
This example demonstrates the "Hello World" starting point for VizHub Version 3, showcasing the runtime environment's ability to render dynamic HTML content through a simple `main` function that writes directly to a container DIV. The code sets a font size variable, which can be interactively adjusted by holding the Alt key and dragging on the number, enabling real-time visual feedback. This setup emphasizes the platform's focus on interactive coding, simplified entry points, and immediate visual updates without requiring an `index.html` file.