This example demonstrates a minimal HTML webpage that uses JavaScript to dynamically update text content. The page contains three identical heading elements with the same id, and a script uses the Document Object Model API’s `getElementById` method to replace the inner HTML of the first matching heading with a new string. The project relies on standard web technologies—HTML, CSS, and JavaScript—without external libraries or frameworks, and is written as a single-file React-free implementation. It shows how client-side scripting can modify static page content after the initial render.