HTML Starter
This example shows a minimal HTML page displaying the text "Testing 1, 2, 3..." as a heading. It uses a plain HTML document structure with a `<head>` and `<body>`, defining a title and a single `<h1>` element. The rendering relies on the browser’s default HTML parsing and styling; no external libraries or JavaScript are included. This serves as a bare-bones starting point for building more complex visualizations, demonstrating the simplest possible web page setup without any data or interactive components.