This example demonstrates a minimal web page that introduces fundamental web technologies: HTML for structure, CSS for presentation, and JavaScript for interactivity. The page displays a heading and a greeting, while the embedded script performs simple arithmetic and logs messages to the browser console. A separate external JavaScript file triggers an alert dialog on load. The code uses native HTML elements, a linked stylesheet (`Style.css`), and inline scripting, with no external libraries or frameworks. The primary rendering approach is the standard document flow within the browser.