This example demonstrates a minimal HTML page that displays the text “Hello HTML!” centered with a large font size, while running a JavaScript computation in the background. The code uses the Quaternion.js library to create a quaternion from the string `"99.3+8i"`, then performs multiplication, division, and subtraction operations with other quaternions, logging the resulting value to the console. Styling is handled through basic CSS within the HTML file, and the JavaScript logic is loaded from a separate `index.js` file.