This example demonstrates the fundamentals of HTML5, CSS, and external content embedding within a single web page. It prominently features the HTML5 logo as an external SVG image and showcases the ability to embed live Observable notebooks via the Observable Runtime API. The page explores link styling and behavior, using CSS selectors to add visual indicators for external links and different `target` attributes, such as opening in new tabs or parent frames. Styling rules define fonts, colors, and link states, while the embedded Observable notebook renders a graphic through the runtime’s `Inspector` module.