This example displays the text “Hello HTML” in large, centered type on a blank page. It demonstrates the minimal setup for an HTML document that loads the D3 library from a CDN. The page uses a `<style>` block to set the body’s text alignment and font size, while the D3 script is included via a `<script>` tag in the head. The content is static, with no JavaScript logic in the separate `index.js` file.