This example demonstrates the initial HTML output before any data loading occurs, displaying a large "Hello HTML!" message centered on the page. The code includes a minimal D3 setup with a placeholder div that will eventually be replaced by parsed CSV content. It uses standard HTML and CSS within an `index.html` file, with the `.message` class styling the text at 13em font size. No external JavaScript libraries are invoked yet, as the visualization has not begun its data-processing workflow.