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This example demonstrates the "Hello World" starting point for the VizHub V3 Runtime Environment, showing how a simple text element renders within a container without requiring an `index.html` file. The `main` function exported from `index.js` receives a `container` DIV and uses a hardcoded `fontSize` variable to style the greeting. The code showcases the platform's interactive widget feature, which allows real-time adjustments by alt-dragging numeric values, though the specific interaction is described in the documentation rather than fully demonstrated in the code itself.