sample
This sample demonstrates a blank-slate starting point for the VizHub V3 runtime, rendering a single styled `<div>` element. It exports a `main` function that receives a container, sets its inner HTML, and applies a fixed font size. The example focuses on the runtime’s interactive widget system, where the font-size number can be altered with Alt-drag to trigger hot reloading. It serves as a minimal template for building larger visualizations, relying on vanilla DOM manipulation rather than external libraries.