This example displays a static HTML page with the text “Hello World!” in the center of the browser window, styled with a large 13em font size. The page includes a linked JavaScript file that computes the sum of two integer variables, 20 and 30, and outputs the result to the browser’s console. The visualization relies solely on standard web technologies—HTML for structure, CSS for typography and centering, and JavaScript for basic arithmetic—without any external data sources or charting libraries.