SVG FUNDAMENTALS
This example demonstrates the VizHub V3 Runtime Environment’s continuous hot reloading, where an exported `main` function renders a "Hello World" message directly into a container DIV. The code uses a plain HTML string with inline `font-size` styling, showing a hardcoded numeric value that can be adjusted interactively via Alt-drag. It highlights the streamlined entry point without an `index.html`, relying on `clientWidth` and `clientHeight` for layout. The piece serves as a blank slate for exploring reactive updates in the runtime.