This example shows a minimal SVG circle rendered inside an HTML page. The code also embeds a YouTube video via an iframe, alongside the SVG element. It uses a simple inline `<svg>` tag with a `<circle>` element, and the page structure follows basic HTML5 conventions with a title and body. The SVG is drawn directly in the markup rather than using a JavaScript library like D3, and the circle’s radius is set to 100 units without any viewBox or styling.